* [PATCH v4 0/7] Introduce optional DLC element for Classic CAN
@ 2020-11-09 10:26 Oliver Hartkopp
2020-11-09 10:26 ` [PATCH v4 1/7] can: add optional DLC element to Classical CAN frame structure Oliver Hartkopp
` (7 more replies)
0 siblings, 8 replies; 13+ messages in thread
From: Oliver Hartkopp @ 2020-11-09 10:26 UTC (permalink / raw)
To: linux-can, mkl, mailhol.vincent; +Cc: netdev, Oliver Hartkopp
Introduce improved DLC handling for Classic CAN with introduces a new
element 'len8_dlc' to the struct can_frame and additionally rename
the 'can_dlc' element to 'len' as it represents a plain payload length.
Before implementing the CAN_CTRLMODE_CC_LEN8_DLC handling on driver level
this patch set cleans up and renames the relevant code.
No functional changes.
This patch set is based on mkl/linux-can.git (testing branch).
Changes in v2:
- rephrase commit message of patch 4 about can_dlc replacement
Changes in v3:
- remove unnecessarily introduced u8 cast in flexcan.c
Changes in v4:
- adopt phrasing suggestions from Vincent Mailhol
- separate and extend CAN documentation (Documentation/networking/can.rst)
- add new patches for len8_dlc handling for CAN drivers
- add new helpers in include/linux/can/dev.h
- add len8_dlc support for various CAN USB adapters as reference
Oliver Hartkopp (7):
can: add optional DLC element to Classical CAN frame structure
can: rename get_can_dlc() macro with can_get_cc_len()
can: remove obsolete get_canfd_dlc() macro
can: replace can_dlc as variable/element for payload length
can: update documentation for DLC usage in Classical CAN
can-dev: introduce helpers to access Classical CAN DLC values
can-dev: add len8_dlc support for various CAN USB adapters
Documentation/networking/can.rst | 68 ++++++++++++++-----
drivers/net/can/at91_can.c | 14 ++--
drivers/net/can/c_can/c_can.c | 20 +++---
drivers/net/can/cc770/cc770.c | 14 ++--
drivers/net/can/dev.c | 10 +--
drivers/net/can/flexcan.c | 4 +-
drivers/net/can/grcan.c | 10 +--
drivers/net/can/ifi_canfd/ifi_canfd.c | 6 +-
drivers/net/can/janz-ican3.c | 20 +++---
drivers/net/can/kvaser_pciefd.c | 4 +-
drivers/net/can/m_can/m_can.c | 6 +-
drivers/net/can/mscan/mscan.c | 20 +++---
drivers/net/can/pch_can.c | 14 ++--
drivers/net/can/peak_canfd/peak_canfd.c | 16 ++---
drivers/net/can/rcar/rcar_can.c | 14 ++--
drivers/net/can/rcar/rcar_canfd.c | 8 +--
drivers/net/can/rx-offload.c | 2 +-
drivers/net/can/sja1000/sja1000.c | 10 +--
drivers/net/can/slcan.c | 32 ++++-----
drivers/net/can/softing/softing_fw.c | 2 +-
drivers/net/can/softing/softing_main.c | 14 ++--
drivers/net/can/spi/hi311x.c | 20 +++---
drivers/net/can/spi/mcp251x.c | 20 +++---
.../net/can/spi/mcp251xfd/mcp251xfd-core.c | 4 +-
drivers/net/can/sun4i_can.c | 10 +--
drivers/net/can/ti_hecc.c | 8 +--
drivers/net/can/usb/ems_usb.c | 16 ++---
drivers/net/can/usb/esd_usb2.c | 16 ++---
drivers/net/can/usb/gs_usb.c | 20 +++---
.../net/can/usb/kvaser_usb/kvaser_usb_core.c | 2 +-
.../net/can/usb/kvaser_usb/kvaser_usb_hydra.c | 20 +++---
.../net/can/usb/kvaser_usb/kvaser_usb_leaf.c | 22 +++---
drivers/net/can/usb/mcba_usb.c | 10 +--
drivers/net/can/usb/peak_usb/pcan_usb.c | 20 +++---
drivers/net/can/usb/peak_usb/pcan_usb_fd.c | 29 +++++---
drivers/net/can/usb/peak_usb/pcan_usb_pro.c | 14 ++--
drivers/net/can/usb/ucan.c | 20 +++---
drivers/net/can/usb/usb_8dev.c | 21 +++---
drivers/net/can/xilinx_can.c | 12 ++--
include/linux/can/dev.h | 30 ++++++--
include/linux/can/dev/peak_canfd.h | 2 +-
include/uapi/linux/can.h | 38 +++++++----
include/uapi/linux/can/netlink.h | 1 +
net/can/af_can.c | 2 +-
net/can/gw.c | 2 +-
net/can/j1939/main.c | 4 +-
46 files changed, 377 insertions(+), 294 deletions(-)
--
2.28.0
^ permalink raw reply [flat|nested] 13+ messages in thread
* [PATCH v4 1/7] can: add optional DLC element to Classical CAN frame structure
2020-11-09 10:26 [PATCH v4 0/7] Introduce optional DLC element for Classic CAN Oliver Hartkopp
@ 2020-11-09 10:26 ` Oliver Hartkopp
2020-11-09 10:26 ` [PATCH v4 2/7] can: rename get_can_dlc() macro with can_get_cc_len() Oliver Hartkopp
` (6 subsequent siblings)
7 siblings, 0 replies; 13+ messages in thread
From: Oliver Hartkopp @ 2020-11-09 10:26 UTC (permalink / raw)
To: linux-can, mkl, mailhol.vincent; +Cc: netdev, Oliver Hartkopp
ISO 11898-1 Chapter 8.4.2.3 defines a 4 bit data length code (DLC) table which
maps the DLC to the payload length of the CAN frame in bytes:
DLC -> payload length
0 .. 8 -> 0 .. 8
9 .. 15 -> 8
Although the DLC values 8 .. 15 in Classical CAN always result in a payload
length of 8 bytes these DLC values are transparently transmitted on the CAN
bus. As the struct can_frame only provides a 'len' element (formerly 'can_dlc')
which contains the plain payload length ( 0 .. 8 ) of the CAN frame, the raw
DLC is not visible to the application programmer, e.g. for testing use-cases.
To access the raw DLC values 9 .. 15 the len8_dlc element is introduced, which
is only valid when the payload length 'len' is 8 and the DLC is greater than 8.
The len8_dlc element is filled by the CAN interface driver and used for CAN
frame creation by the CAN driver when the CAN_CTRLMODE_CC_LEN8_DLC flag is
supported by the driver and enabled via netlink configuration interface.
Reported-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
---
include/uapi/linux/can.h | 38 ++++++++++++++++++++------------
include/uapi/linux/can/netlink.h | 1 +
2 files changed, 25 insertions(+), 14 deletions(-)
diff --git a/include/uapi/linux/can.h b/include/uapi/linux/can.h
index 6a6d2c7655ff..f75238ac6dce 100644
--- a/include/uapi/linux/can.h
+++ b/include/uapi/linux/can.h
@@ -82,34 +82,44 @@ typedef __u32 canid_t;
*/
typedef __u32 can_err_mask_t;
/* CAN payload length and DLC definitions according to ISO 11898-1 */
#define CAN_MAX_DLC 8
+#define CAN_MAX_RAW_DLC 15
#define CAN_MAX_DLEN 8
/* CAN FD payload length and DLC definitions according to ISO 11898-7 */
#define CANFD_MAX_DLC 15
#define CANFD_MAX_DLEN 64
/**
- * struct can_frame - basic CAN frame structure
- * @can_id: CAN ID of the frame and CAN_*_FLAG flags, see canid_t definition
- * @can_dlc: frame payload length in byte (0 .. 8) aka data length code
- * N.B. the DLC field from ISO 11898-1 Chapter 8.4.2.3 has a 1:1
- * mapping of the 'data length code' to the real payload length
- * @__pad: padding
- * @__res0: reserved / padding
- * @__res1: reserved / padding
- * @data: CAN frame payload (up to 8 byte)
+ * struct can_frame - Classical CAN frame structure (aka CAN 2.0B)
+ * @can_id: CAN ID of the frame and CAN_*_FLAG flags, see canid_t definition
+ * @len: CAN frame payload length in byte (0 .. 8)
+ * @can_dlc: deprecated name for CAN frame payload length in byte (0 .. 8)
+ * @__pad: padding
+ * @__res0: reserved / padding
+ * @len8_dlc: optional DLC value (9 .. 15) at 8 byte payload length
+ * len8_dlc contains values from 9 .. 15 when the payload length is
+ * 8 bytes but the DLC value (see ISO 11898-1) is greater then 8.
+ * CAN_CTRLMODE_CC_LEN8_DLC flag has to be enabled in CAN driver.
+ * @data: CAN frame payload (up to 8 byte)
*/
struct can_frame {
canid_t can_id; /* 32 bit CAN_ID + EFF/RTR/ERR flags */
- __u8 can_dlc; /* frame payload length in byte (0 .. CAN_MAX_DLEN) */
- __u8 __pad; /* padding */
- __u8 __res0; /* reserved / padding */
- __u8 __res1; /* reserved / padding */
- __u8 data[CAN_MAX_DLEN] __attribute__((aligned(8)));
+ union {
+ /* CAN frame payload length in byte (0 .. CAN_MAX_DLEN)
+ * was previously named can_dlc so we need to carry that
+ * name for legacy support
+ */
+ __u8 len;
+ __u8 can_dlc; /* deprecated */
+ };
+ __u8 __pad; /* padding */
+ __u8 __res0; /* reserved / padding */
+ __u8 len8_dlc; /* optional DLC for 8 byte payload length (9 .. 15) */
+ __u8 data[CAN_MAX_DLEN] __attribute__((aligned(8)));
};
/*
* defined bits for canfd_frame.flags
*
diff --git a/include/uapi/linux/can/netlink.h b/include/uapi/linux/can/netlink.h
index 6f598b73839e..f730d443b918 100644
--- a/include/uapi/linux/can/netlink.h
+++ b/include/uapi/linux/can/netlink.h
@@ -98,10 +98,11 @@ struct can_ctrlmode {
#define CAN_CTRLMODE_ONE_SHOT 0x08 /* One-Shot mode */
#define CAN_CTRLMODE_BERR_REPORTING 0x10 /* Bus-error reporting */
#define CAN_CTRLMODE_FD 0x20 /* CAN FD mode */
#define CAN_CTRLMODE_PRESUME_ACK 0x40 /* Ignore missing CAN ACKs */
#define CAN_CTRLMODE_FD_NON_ISO 0x80 /* CAN FD in non-ISO mode */
+#define CAN_CTRLMODE_CC_LEN8_DLC 0x100 /* Classic CAN DLC option */
/*
* CAN device statistics
*/
struct can_device_stats {
--
2.28.0
^ permalink raw reply related [flat|nested] 13+ messages in thread
* [PATCH v4 2/7] can: rename get_can_dlc() macro with can_get_cc_len()
2020-11-09 10:26 [PATCH v4 0/7] Introduce optional DLC element for Classic CAN Oliver Hartkopp
2020-11-09 10:26 ` [PATCH v4 1/7] can: add optional DLC element to Classical CAN frame structure Oliver Hartkopp
@ 2020-11-09 10:26 ` Oliver Hartkopp
2020-11-09 10:26 ` [PATCH v4 3/7] can: remove obsolete get_canfd_dlc() macro Oliver Hartkopp
` (5 subsequent siblings)
7 siblings, 0 replies; 13+ messages in thread
From: Oliver Hartkopp @ 2020-11-09 10:26 UTC (permalink / raw)
To: linux-can, mkl, mailhol.vincent; +Cc: netdev, Oliver Hartkopp
The get_can_dlc() macro is used to ensure the payload length information of
the Classical CAN frame to be max 8 bytes (the CAN_MAX_DLEN).
Rename the macro and use the correct constant in preparation of the len/dlc
cleanup for Classical CAN frames.
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
---
drivers/net/can/at91_can.c | 2 +-
drivers/net/can/c_can/c_can.c | 2 +-
drivers/net/can/cc770/cc770.c | 2 +-
drivers/net/can/flexcan.c | 2 +-
drivers/net/can/grcan.c | 2 +-
drivers/net/can/ifi_canfd/ifi_canfd.c | 2 +-
drivers/net/can/janz-ican3.c | 4 ++--
drivers/net/can/m_can/m_can.c | 2 +-
drivers/net/can/mscan/mscan.c | 2 +-
drivers/net/can/pch_can.c | 4 ++--
drivers/net/can/peak_canfd/peak_canfd.c | 2 +-
drivers/net/can/rcar/rcar_can.c | 2 +-
drivers/net/can/rcar/rcar_canfd.c | 4 ++--
drivers/net/can/sja1000/sja1000.c | 2 +-
drivers/net/can/softing/softing_main.c | 2 +-
drivers/net/can/spi/hi311x.c | 2 +-
drivers/net/can/spi/mcp251x.c | 4 ++--
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c | 2 +-
drivers/net/can/sun4i_can.c | 2 +-
drivers/net/can/ti_hecc.c | 2 +-
drivers/net/can/usb/ems_usb.c | 2 +-
drivers/net/can/usb/esd_usb2.c | 2 +-
drivers/net/can/usb/gs_usb.c | 2 +-
drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c | 4 ++--
drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c | 4 ++--
drivers/net/can/usb/mcba_usb.c | 2 +-
drivers/net/can/usb/peak_usb/pcan_usb.c | 2 +-
drivers/net/can/usb/peak_usb/pcan_usb_fd.c | 2 +-
drivers/net/can/usb/ucan.c | 8 ++++----
drivers/net/can/usb/usb_8dev.c | 2 +-
drivers/net/can/xilinx_can.c | 4 ++--
include/linux/can/dev.h | 8 ++++----
32 files changed, 45 insertions(+), 45 deletions(-)
diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c
index c14de95d2ca7..cf515e3134dc 100644
--- a/drivers/net/can/at91_can.c
+++ b/drivers/net/can/at91_can.c
@@ -578,11 +578,11 @@ static void at91_read_mb(struct net_device *dev, unsigned int mb,
cf->can_id = ((reg_mid >> 0) & CAN_EFF_MASK) | CAN_EFF_FLAG;
else
cf->can_id = (reg_mid >> 18) & CAN_SFF_MASK;
reg_msr = at91_read(priv, AT91_MSR(mb));
- cf->can_dlc = get_can_dlc((reg_msr >> 16) & 0xf);
+ cf->can_dlc = can_get_cc_len((reg_msr >> 16) & 0xf);
if (reg_msr & AT91_MSR_MRTR)
cf->can_id |= CAN_RTR_FLAG;
else {
*(u32 *)(cf->data + 0) = at91_read(priv, AT91_MDL(mb));
diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 1ccdbe89585b..b36c69983f69 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -395,11 +395,11 @@ static int c_can_read_msg_object(struct net_device *dev, int iface, u32 ctrl)
if (!skb) {
stats->rx_dropped++;
return -ENOMEM;
}
- frame->can_dlc = get_can_dlc(ctrl & 0x0F);
+ frame->can_dlc = can_get_cc_len(ctrl & 0x0F);
arb = priv->read_reg32(priv, C_CAN_IFACE(ARB1_REG, iface));
if (arb & IF_ARB_MSGXTD)
frame->can_id = (arb & CAN_EFF_MASK) | CAN_EFF_FLAG;
diff --git a/drivers/net/can/cc770/cc770.c b/drivers/net/can/cc770/cc770.c
index 07e2b8df5153..55ebf006484e 100644
--- a/drivers/net/can/cc770/cc770.c
+++ b/drivers/net/can/cc770/cc770.c
@@ -484,11 +484,11 @@ static void cc770_rx(struct net_device *dev, unsigned int mo, u8 ctrl1)
id |= cc770_read_reg(priv, msgobj[mo].id[0]) << 8;
id >>= 5;
}
cf->can_id = id;
- cf->can_dlc = get_can_dlc((config & 0xf0) >> 4);
+ cf->can_dlc = can_get_cc_len((config & 0xf0) >> 4);
for (i = 0; i < cf->can_dlc; i++)
cf->data[i] = cc770_read_reg(priv, msgobj[mo].data[i]);
}
stats->rx_packets++;
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 881799bd9c5e..b30e3171cbd0 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -1001,11 +1001,11 @@ static struct sk_buff *flexcan_mailbox_read(struct can_rx_offload *offload,
cfd->len = can_dlc2len(get_canfd_dlc((reg_ctrl >> 16) & 0xf));
if (reg_ctrl & FLEXCAN_MB_CNT_BRS)
cfd->flags |= CANFD_BRS;
} else {
- cfd->len = get_can_dlc((reg_ctrl >> 16) & 0xf);
+ cfd->len = can_get_cc_len((reg_ctrl >> 16) & 0xf);
if (reg_ctrl & FLEXCAN_MB_CNT_RTR)
cfd->can_id |= CAN_RTR_FLAG;
}
diff --git a/drivers/net/can/grcan.c b/drivers/net/can/grcan.c
index 39802f107eb1..56e6902b3121 100644
--- a/drivers/net/can/grcan.c
+++ b/drivers/net/can/grcan.c
@@ -1199,11 +1199,11 @@ static int grcan_receive(struct net_device *dev, int budget)
cf->can_id |= CAN_EFF_FLAG;
} else {
cf->can_id = ((slot[0] & GRCAN_MSG_BID)
>> GRCAN_MSG_BID_BIT);
}
- cf->can_dlc = get_can_dlc((slot[1] & GRCAN_MSG_DLC)
+ cf->can_dlc = can_get_cc_len((slot[1] & GRCAN_MSG_DLC)
>> GRCAN_MSG_DLC_BIT);
if (rtr) {
cf->can_id |= CAN_RTR_FLAG;
} else {
for (i = 0; i < cf->can_dlc; i++) {
diff --git a/drivers/net/can/ifi_canfd/ifi_canfd.c b/drivers/net/can/ifi_canfd/ifi_canfd.c
index 74503cacf594..67f6d72cdc71 100644
--- a/drivers/net/can/ifi_canfd/ifi_canfd.c
+++ b/drivers/net/can/ifi_canfd/ifi_canfd.c
@@ -271,11 +271,11 @@ static void ifi_canfd_read_fifo(struct net_device *ndev)
dlc = (rxdlc >> IFI_CANFD_RXFIFO_DLC_DLC_OFFSET) &
IFI_CANFD_RXFIFO_DLC_DLC_MASK;
if (rxdlc & IFI_CANFD_RXFIFO_DLC_EDL)
cf->len = can_dlc2len(dlc);
else
- cf->len = get_can_dlc(dlc);
+ cf->len = can_get_cc_len(dlc);
rxid = readl(priv->base + IFI_CANFD_RXFIFO_ID);
id = (rxid >> IFI_CANFD_RXFIFO_ID_ID_OFFSET);
if (id & IFI_CANFD_RXFIFO_ID_IDE) {
id &= IFI_CANFD_RXFIFO_ID_ID_XTD_MASK;
diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
index f929db893957..a0af78b15319 100644
--- a/drivers/net/can/janz-ican3.c
+++ b/drivers/net/can/janz-ican3.c
@@ -914,14 +914,14 @@ static void ican3_to_can_frame(struct ican3_dev *mod,
if (desc->data[1] & ICAN3_SFF_RTR)
cf->can_id |= CAN_RTR_FLAG;
cf->can_id |= desc->data[0] << 3;
cf->can_id |= (desc->data[1] & 0xe0) >> 5;
- cf->can_dlc = get_can_dlc(desc->data[1] & ICAN3_CAN_DLC_MASK);
+ cf->can_dlc = can_get_cc_len(desc->data[1] & ICAN3_CAN_DLC_MASK);
memcpy(cf->data, &desc->data[2], cf->can_dlc);
} else {
- cf->can_dlc = get_can_dlc(desc->data[0] & ICAN3_CAN_DLC_MASK);
+ cf->can_dlc = can_get_cc_len(desc->data[0] & ICAN3_CAN_DLC_MASK);
if (desc->data[0] & ICAN3_EFF_RTR)
cf->can_id |= CAN_RTR_FLAG;
if (desc->data[0] & ICAN3_EFF) {
cf->can_id |= CAN_EFF_FLAG;
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 02c5795b7393..34cbb358731c 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -457,11 +457,11 @@ static void m_can_read_fifo(struct net_device *dev, u32 rxfs)
}
if (dlc & RX_BUF_FDF)
cf->len = can_dlc2len((dlc >> 16) & 0x0F);
else
- cf->len = get_can_dlc((dlc >> 16) & 0x0F);
+ cf->len = can_get_cc_len((dlc >> 16) & 0x0F);
id = m_can_fifo_read(cdev, fgi, M_CAN_FIFO_ID);
if (id & RX_BUF_XTD)
cf->can_id = (id & CAN_EFF_MASK) | CAN_EFF_FLAG;
else
diff --git a/drivers/net/can/mscan/mscan.c b/drivers/net/can/mscan/mscan.c
index 640ba1b356ec..153650b8341a 100644
--- a/drivers/net/can/mscan/mscan.c
+++ b/drivers/net/can/mscan/mscan.c
@@ -310,11 +310,11 @@ static void mscan_get_rx_frame(struct net_device *dev, struct can_frame *frame)
frame->can_id |= can_id >> 1;
if (can_id & 1)
frame->can_id |= CAN_RTR_FLAG;
- frame->can_dlc = get_can_dlc(in_8(®s->rx.dlr) & 0xf);
+ frame->can_dlc = can_get_cc_len(in_8(®s->rx.dlr) & 0xf);
if (!(frame->can_id & CAN_RTR_FLAG)) {
void __iomem *data = ®s->rx.dsr1_0;
u16 *payload = (u16 *)frame->data;
diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
index 5c180d2f3c3c..86c610d7033f 100644
--- a/drivers/net/can/pch_can.c
+++ b/drivers/net/can/pch_can.c
@@ -681,11 +681,11 @@ static int pch_can_rx_normal(struct net_device *ndev, u32 obj_num, int quota)
}
if (id2 & PCH_ID2_DIR)
cf->can_id |= CAN_RTR_FLAG;
- cf->can_dlc = get_can_dlc((ioread32(&priv->regs->
+ cf->can_dlc = can_get_cc_len((ioread32(&priv->regs->
ifregs[0].mcont)) & 0xF);
for (i = 0; i < cf->can_dlc; i += 2) {
data_reg = ioread16(&priv->regs->ifregs[0].data[i / 2]);
cf->data[i] = data_reg;
@@ -713,11 +713,11 @@ static void pch_can_tx_complete(struct net_device *ndev, u32 int_stat)
can_get_echo_skb(ndev, int_stat - PCH_RX_OBJ_END - 1);
iowrite32(PCH_CMASK_RX_TX_GET | PCH_CMASK_CLRINTPND,
&priv->regs->ifregs[1].cmask);
pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, int_stat);
- dlc = get_can_dlc(ioread32(&priv->regs->ifregs[1].mcont) &
+ dlc = can_get_cc_len(ioread32(&priv->regs->ifregs[1].mcont) &
PCH_IF_MCONT_DLC);
stats->tx_bytes += dlc;
stats->tx_packets++;
if (int_stat == PCH_TX_OBJ_END)
netif_wake_queue(ndev);
diff --git a/drivers/net/can/peak_canfd/peak_canfd.c b/drivers/net/can/peak_canfd/peak_canfd.c
index 40c33b8a5fda..dc94ea6821c3 100644
--- a/drivers/net/can/peak_canfd/peak_canfd.c
+++ b/drivers/net/can/peak_canfd/peak_canfd.c
@@ -257,11 +257,11 @@ static int pucan_handle_can_rx(struct peak_canfd_priv *priv,
u8 cf_len;
if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN)
cf_len = can_dlc2len(get_canfd_dlc(pucan_msg_get_dlc(msg)));
else
- cf_len = get_can_dlc(pucan_msg_get_dlc(msg));
+ cf_len = can_get_cc_len(pucan_msg_get_dlc(msg));
/* if this frame is an echo, */
if (rx_msg_flags & PUCAN_MSG_LOOPED_BACK) {
unsigned long flags;
diff --git a/drivers/net/can/rcar/rcar_can.c b/drivers/net/can/rcar/rcar_can.c
index 48575900adb7..874cd0badf0f 100644
--- a/drivers/net/can/rcar/rcar_can.c
+++ b/drivers/net/can/rcar/rcar_can.c
@@ -657,11 +657,11 @@ static void rcar_can_rx_pkt(struct rcar_can_priv *priv)
cf->can_id = (data & CAN_EFF_MASK) | CAN_EFF_FLAG;
else
cf->can_id = (data >> RCAR_CAN_SID_SHIFT) & CAN_SFF_MASK;
dlc = readb(&priv->regs->mb[RCAR_CAN_RX_FIFO_MBX].dlc);
- cf->can_dlc = get_can_dlc(dlc);
+ cf->can_dlc = can_get_cc_len(dlc);
if (data & RCAR_CAN_RTR) {
cf->can_id |= CAN_RTR_FLAG;
} else {
for (dlc = 0; dlc < cf->can_dlc; dlc++)
cf->data[dlc] =
diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index de59dd6aad29..7fc885dbdf56 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -1446,11 +1446,11 @@ static void rcar_canfd_rx_pkt(struct rcar_canfd_channel *priv)
if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
if (sts & RCANFD_RFFDSTS_RFFDF)
cf->len = can_dlc2len(RCANFD_RFPTR_RFDLC(dlc));
else
- cf->len = get_can_dlc(RCANFD_RFPTR_RFDLC(dlc));
+ cf->len = can_get_cc_len(RCANFD_RFPTR_RFDLC(dlc));
if (sts & RCANFD_RFFDSTS_RFESI) {
cf->flags |= CANFD_ESI;
netdev_dbg(priv->ndev, "ESI Error\n");
}
@@ -1462,11 +1462,11 @@ static void rcar_canfd_rx_pkt(struct rcar_canfd_channel *priv)
cf->flags |= CANFD_BRS;
rcar_canfd_get_data(priv, cf, RCANFD_F_RFDF(ridx, 0));
}
} else {
- cf->len = get_can_dlc(RCANFD_RFPTR_RFDLC(dlc));
+ cf->len = can_get_cc_len(RCANFD_RFPTR_RFDLC(dlc));
if (id & RCANFD_RFID_RFRTR)
cf->can_id |= CAN_RTR_FLAG;
else
rcar_canfd_get_data(priv, cf, RCANFD_C_RFDF(ridx, 0));
}
diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c
index 9f107798f904..ddb09172c1af 100644
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -365,11 +365,11 @@ static void sja1000_rx(struct net_device *dev)
dreg = SJA1000_SFF_BUF;
id = (priv->read_reg(priv, SJA1000_ID1) << 3)
| (priv->read_reg(priv, SJA1000_ID2) >> 5);
}
- cf->can_dlc = get_can_dlc(fi & 0x0F);
+ cf->can_dlc = can_get_cc_len(fi & 0x0F);
if (fi & SJA1000_FI_RTR) {
id |= CAN_RTR_FLAG;
} else {
for (i = 0; i < cf->can_dlc; i++)
cf->data[i] = priv->read_reg(priv, dreg++);
diff --git a/drivers/net/can/softing/softing_main.c b/drivers/net/can/softing/softing_main.c
index 9d2faaa39ce4..5cc175fd7067 100644
--- a/drivers/net/can/softing/softing_main.c
+++ b/drivers/net/can/softing/softing_main.c
@@ -259,11 +259,11 @@ static int softing_handle_1(struct softing *card)
}
} else {
if (cmd & CMD_RTR)
msg.can_id |= CAN_RTR_FLAG;
- msg.can_dlc = get_can_dlc(*ptr++);
+ msg.can_dlc = can_get_cc_len(*ptr++);
if (cmd & CMD_XTD) {
msg.can_id |= CAN_EFF_FLAG;
msg.can_id |= le32_to_cpup((void *)ptr);
ptr += 4;
} else {
diff --git a/drivers/net/can/spi/hi311x.c b/drivers/net/can/spi/hi311x.c
index 73d48c3b8ded..b182951dba52 100644
--- a/drivers/net/can/spi/hi311x.c
+++ b/drivers/net/can/spi/hi311x.c
@@ -339,11 +339,11 @@ static void hi3110_hw_rx(struct spi_device *spi)
(buf[HI3110_FIFO_WOTIME_ID_OFF] << 3) |
((buf[HI3110_FIFO_WOTIME_ID_OFF + 1] & 0xE0) >> 5);
}
/* Data length */
- frame->can_dlc = get_can_dlc(buf[HI3110_FIFO_WOTIME_DLC_OFF] & 0x0F);
+ frame->can_dlc = can_get_cc_len(buf[HI3110_FIFO_WOTIME_DLC_OFF] & 0x0F);
if (buf[HI3110_FIFO_WOTIME_ID_OFF + 3] & HI3110_FIFO_WOTIME_ID_RTR)
frame->can_id |= CAN_RTR_FLAG;
else
memcpy(frame->data, buf + HI3110_FIFO_WOTIME_DAT_OFF,
diff --git a/drivers/net/can/spi/mcp251x.c b/drivers/net/can/spi/mcp251x.c
index 22d814ae4edc..5764f88f2347 100644
--- a/drivers/net/can/spi/mcp251x.c
+++ b/drivers/net/can/spi/mcp251x.c
@@ -662,11 +662,11 @@ static void mcp251x_hw_rx_frame(struct spi_device *spi, u8 *buf,
int i, len;
for (i = 1; i < RXBDAT_OFF; i++)
buf[i] = mcp251x_read_reg(spi, RXBCTRL(buf_idx) + i);
- len = get_can_dlc(buf[RXBDLC_OFF] & RXBDLC_LEN_MASK);
+ len = can_get_cc_len(buf[RXBDLC_OFF] & RXBDLC_LEN_MASK);
for (; i < (RXBDAT_OFF + len); i++)
buf[i] = mcp251x_read_reg(spi, RXBCTRL(buf_idx) + i);
} else {
priv->spi_tx_buf[RXBCTRL_OFF] = INSTRUCTION_READ_RXB(buf_idx);
if (spi->controller->flags & SPI_CONTROLLER_HALF_DUPLEX) {
@@ -718,11 +718,11 @@ static void mcp251x_hw_rx(struct spi_device *spi, int buf_idx)
(buf[RXBSIDL_OFF] >> RXBSIDL_SHIFT);
if (buf[RXBSIDL_OFF] & RXBSIDL_SRR)
frame->can_id |= CAN_RTR_FLAG;
}
/* Data length */
- frame->can_dlc = get_can_dlc(buf[RXBDLC_OFF] & RXBDLC_LEN_MASK);
+ frame->can_dlc = can_get_cc_len(buf[RXBDLC_OFF] & RXBDLC_LEN_MASK);
memcpy(frame->data, buf + RXBDAT_OFF, frame->can_dlc);
priv->net->stats.rx_packets++;
priv->net->stats.rx_bytes += frame->can_dlc;
diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
index 9c215f7c5f81..ae9e9bafba23 100644
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
@@ -1408,11 +1408,11 @@ mcp251xfd_hw_rx_obj_to_skb(const struct mcp251xfd_priv *priv,
cfd->len = can_dlc2len(get_canfd_dlc(dlc));
} else {
if (hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_RTR)
cfd->can_id |= CAN_RTR_FLAG;
- cfd->len = get_can_dlc(FIELD_GET(MCP251XFD_OBJ_FLAGS_DLC,
+ cfd->len = can_get_cc_len(FIELD_GET(MCP251XFD_OBJ_FLAGS_DLC,
hw_rx_obj->flags));
}
memcpy(cfd->data, hw_rx_obj->data, cfd->len);
}
diff --git a/drivers/net/can/sun4i_can.c b/drivers/net/can/sun4i_can.c
index e2c6cf4b2228..28cc9e0f3982 100644
--- a/drivers/net/can/sun4i_can.c
+++ b/drivers/net/can/sun4i_can.c
@@ -473,11 +473,11 @@ static void sun4i_can_rx(struct net_device *dev)
skb = alloc_can_skb(dev, &cf);
if (!skb)
return;
fi = readl(priv->base + SUN4I_REG_BUF0_ADDR);
- cf->can_dlc = get_can_dlc(fi & 0x0F);
+ cf->can_dlc = can_get_cc_len(fi & 0x0F);
if (fi & SUN4I_MSG_EFF_FLAG) {
dreg = SUN4I_REG_BUF5_ADDR;
id = (readl(priv->base + SUN4I_REG_BUF1_ADDR) << 21) |
(readl(priv->base + SUN4I_REG_BUF2_ADDR) << 13) |
(readl(priv->base + SUN4I_REG_BUF3_ADDR) << 5) |
diff --git a/drivers/net/can/ti_hecc.c b/drivers/net/can/ti_hecc.c
index 9913f5458279..02e4260fd8f2 100644
--- a/drivers/net/can/ti_hecc.c
+++ b/drivers/net/can/ti_hecc.c
@@ -564,11 +564,11 @@ static struct sk_buff *ti_hecc_mailbox_read(struct can_rx_offload *offload,
cf->can_id = (data >> 18) & CAN_SFF_MASK;
data = hecc_read_mbx(priv, mbxno, HECC_CANMCF);
if (data & HECC_CANMCF_RTR)
cf->can_id |= CAN_RTR_FLAG;
- cf->can_dlc = get_can_dlc(data & 0xF);
+ cf->can_dlc = can_get_cc_len(data & 0xF);
data = hecc_read_mbx(priv, mbxno, HECC_CANMDL);
*(__be32 *)(cf->data) = cpu_to_be32(data);
if (cf->can_dlc > 4) {
data = hecc_read_mbx(priv, mbxno, HECC_CANMDH);
diff --git a/drivers/net/can/usb/ems_usb.c b/drivers/net/can/usb/ems_usb.c
index 4f52810bebf8..0ccf8c0f7db5 100644
--- a/drivers/net/can/usb/ems_usb.c
+++ b/drivers/net/can/usb/ems_usb.c
@@ -304,11 +304,11 @@ static void ems_usb_rx_can_msg(struct ems_usb *dev, struct ems_cpc_msg *msg)
skb = alloc_can_skb(dev->netdev, &cf);
if (skb == NULL)
return;
cf->can_id = le32_to_cpu(msg->msg.can_msg.id);
- cf->can_dlc = get_can_dlc(msg->msg.can_msg.length & 0xF);
+ cf->can_dlc = can_get_cc_len(msg->msg.can_msg.length & 0xF);
if (msg->type == CPC_MSG_TYPE_EXT_CAN_FRAME ||
msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME)
cf->can_id |= CAN_EFF_FLAG;
diff --git a/drivers/net/can/usb/esd_usb2.c b/drivers/net/can/usb/esd_usb2.c
index b5d7ed21d7d9..8752bda36b46 100644
--- a/drivers/net/can/usb/esd_usb2.c
+++ b/drivers/net/can/usb/esd_usb2.c
@@ -319,11 +319,11 @@ static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv,
stats->rx_dropped++;
return;
}
cf->can_id = id & ESD_IDMASK;
- cf->can_dlc = get_can_dlc(msg->msg.rx.dlc & ~ESD_RTR);
+ cf->can_dlc = can_get_cc_len(msg->msg.rx.dlc & ~ESD_RTR);
if (id & ESD_EXTID)
cf->can_id |= CAN_EFF_FLAG;
if (msg->msg.rx.dlc & ESD_RTR) {
diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index 3005157059ca..07fe84968391 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -329,11 +329,11 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
if (!skb)
return;
cf->can_id = hf->can_id;
- cf->can_dlc = get_can_dlc(hf->can_dlc);
+ cf->can_dlc = can_get_cc_len(hf->can_dlc);
memcpy(cf->data, hf->data, 8);
/* ERROR frames tell us information about the controller */
if (hf->can_id & CAN_ERR_FLAG)
gs_update_state(dev, cf);
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
index 7ab87a758754..1626f73337ab 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
@@ -1178,11 +1178,11 @@ static void kvaser_usb_hydra_rx_msg_std(const struct kvaser_usb *dev,
}
if (flags & KVASER_USB_HYDRA_CF_FLAG_OVERRUN)
kvaser_usb_can_rx_over_error(priv->netdev);
- cf->can_dlc = get_can_dlc(cmd->rx_can.dlc);
+ cf->can_dlc = can_get_cc_len(cmd->rx_can.dlc);
if (flags & KVASER_USB_HYDRA_CF_FLAG_REMOTE_FRAME)
cf->can_id |= CAN_RTR_FLAG;
else
memcpy(cf->data, cmd->rx_can.data, cf->can_dlc);
@@ -1255,11 +1255,11 @@ static void kvaser_usb_hydra_rx_msg_ext(const struct kvaser_usb *dev,
if (flags & KVASER_USB_HYDRA_CF_FLAG_BRS)
cf->flags |= CANFD_BRS;
if (flags & KVASER_USB_HYDRA_CF_FLAG_ESI)
cf->flags |= CANFD_ESI;
} else {
- cf->len = get_can_dlc(dlc);
+ cf->len = can_get_cc_len(dlc);
}
if (flags & KVASER_USB_HYDRA_CF_FLAG_REMOTE_FRAME)
cf->can_id |= CAN_RTR_FLAG;
else
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
index 1b9957f12459..dcc5aa022e8f 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
@@ -976,11 +976,11 @@ static void kvaser_usb_leaf_rx_can_msg(const struct kvaser_usb *dev,
if (cf->can_id & KVASER_EXTENDED_FRAME)
cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
else
cf->can_id &= CAN_SFF_MASK;
- cf->can_dlc = get_can_dlc(cmd->u.leaf.log_message.dlc);
+ cf->can_dlc = can_get_cc_len(cmd->u.leaf.log_message.dlc);
if (cmd->u.leaf.log_message.flags & MSG_FLAG_REMOTE_FRAME)
cf->can_id |= CAN_RTR_FLAG;
else
memcpy(cf->data, &cmd->u.leaf.log_message.data,
@@ -994,11 +994,11 @@ static void kvaser_usb_leaf_rx_can_msg(const struct kvaser_usb *dev,
((rx_data[3] & 0xff) << 6) |
(rx_data[4] & 0x3f);
cf->can_id |= CAN_EFF_FLAG;
}
- cf->can_dlc = get_can_dlc(rx_data[5]);
+ cf->can_dlc = can_get_cc_len(rx_data[5]);
if (cmd->u.rx_can_header.flag & MSG_FLAG_REMOTE_FRAME)
cf->can_id |= CAN_RTR_FLAG;
else
memcpy(cf->data, &rx_data[6], cf->can_dlc);
diff --git a/drivers/net/can/usb/mcba_usb.c b/drivers/net/can/usb/mcba_usb.c
index 5857b37dcd96..14352718b004 100644
--- a/drivers/net/can/usb/mcba_usb.c
+++ b/drivers/net/can/usb/mcba_usb.c
@@ -449,11 +449,11 @@ static void mcba_usb_process_can(struct mcba_priv *priv,
}
if (msg->dlc & MCBA_DLC_RTR_MASK)
cf->can_id |= CAN_RTR_FLAG;
- cf->can_dlc = get_can_dlc(msg->dlc & MCBA_DLC_MASK);
+ cf->can_dlc = can_get_cc_len(msg->dlc & MCBA_DLC_MASK);
memcpy(cf->data, msg->data, cf->can_dlc);
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb.c b/drivers/net/can/usb/peak_usb/pcan_usb.c
index 63bd2ed96697..5df74533ba4d 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb.c
@@ -732,11 +732,11 @@ static int pcan_usb_decode_data(struct pcan_usb_msg_context *mc, u8 status_len)
mc->ptr += 2;
cf->can_id = le16_to_cpu(tmp16) >> 5;
}
- cf->can_dlc = get_can_dlc(rec_len);
+ cf->can_dlc = can_get_cc_len(rec_len);
/* Only first packet timestamp is a word */
if (pcan_usb_decode_ts(mc, !mc->rec_ts_idx))
goto decode_failed;
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
index d29d20525588..cf32bcfabba3 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
@@ -497,11 +497,11 @@ static int pcan_usb_fd_decode_canmsg(struct pcan_usb_fd_if *usb_if,
/* CAN 2.0 frame case */
skb = alloc_can_skb(netdev, (struct can_frame **)&cfd);
if (!skb)
return -ENOMEM;
- cfd->len = get_can_dlc(pucan_msg_get_dlc(rm));
+ cfd->len = can_get_cc_len(pucan_msg_get_dlc(rm));
}
cfd->can_id = le32_to_cpu(rm->can_id);
if (rx_msg_flags & PUCAN_MSG_EXT_ID)
diff --git a/drivers/net/can/usb/ucan.c b/drivers/net/can/usb/ucan.c
index dc5290b36598..ea11a3f0392b 100644
--- a/drivers/net/can/usb/ucan.c
+++ b/drivers/net/can/usb/ucan.c
@@ -301,16 +301,16 @@ struct ucan_priv {
spinlock_t context_lock;
unsigned int available_tx_urbs;
struct ucan_urb_context *context_array;
};
-static u8 ucan_get_can_dlc(struct ucan_can_msg *msg, u16 len)
+static u8 ucan_can_get_cc_len(struct ucan_can_msg *msg, u16 len)
{
if (le32_to_cpu(msg->id) & CAN_RTR_FLAG)
- return get_can_dlc(msg->dlc);
+ return can_get_cc_len(msg->dlc);
else
- return get_can_dlc(len - (UCAN_IN_HDR_SIZE + sizeof(msg->id)));
+ return can_get_cc_len(len - (UCAN_IN_HDR_SIZE + sizeof(msg->id)));
}
static void ucan_release_context_array(struct ucan_priv *up)
{
if (!up->context_array)
@@ -612,11 +612,11 @@ static void ucan_rx_can_msg(struct ucan_priv *up, struct ucan_message_in *m)
/* fill the can frame */
cf->can_id = canid;
/* compute DLC taking RTR_FLAG into account */
- cf->can_dlc = ucan_get_can_dlc(&m->msg.can_msg, len);
+ cf->can_dlc = ucan_can_get_cc_len(&m->msg.can_msg, len);
/* copy the payload of non RTR frames */
if (!(cf->can_id & CAN_RTR_FLAG) || (cf->can_id & CAN_ERR_FLAG))
memcpy(cf->data, m->msg.can_msg.data, cf->can_dlc);
diff --git a/drivers/net/can/usb/usb_8dev.c b/drivers/net/can/usb/usb_8dev.c
index 62749c67c959..9d1597ad7ba4 100644
--- a/drivers/net/can/usb/usb_8dev.c
+++ b/drivers/net/can/usb/usb_8dev.c
@@ -468,11 +468,11 @@ static void usb_8dev_rx_can_msg(struct usb_8dev_priv *priv,
skb = alloc_can_skb(priv->netdev, &cf);
if (!skb)
return;
cf->can_id = be32_to_cpu(msg->id);
- cf->can_dlc = get_can_dlc(msg->dlc & 0xF);
+ cf->can_dlc = can_get_cc_len(msg->dlc & 0xF);
if (msg->flags & USB_8DEV_EXTID)
cf->can_id |= CAN_EFF_FLAG;
if (msg->flags & USB_8DEV_RTR)
diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c
index 48d746e18f30..1740fbc371c4 100644
--- a/drivers/net/can/xilinx_can.c
+++ b/drivers/net/can/xilinx_can.c
@@ -757,11 +757,11 @@ static int xcan_rx(struct net_device *ndev, int frame_base)
id_xcan = priv->read_reg(priv, XCAN_FRAME_ID_OFFSET(frame_base));
dlc = priv->read_reg(priv, XCAN_FRAME_DLC_OFFSET(frame_base)) >>
XCAN_DLCR_DLC_SHIFT;
/* Change Xilinx CAN data length format to socketCAN data format */
- cf->can_dlc = get_can_dlc(dlc);
+ cf->can_dlc = can_get_cc_len(dlc);
/* Change Xilinx CAN ID format to socketCAN ID format */
if (id_xcan & XCAN_IDR_IDE_MASK) {
/* The received frame is an Extended format frame */
cf->can_id = (id_xcan & XCAN_IDR_ID1_MASK) >> 3;
@@ -833,11 +833,11 @@ static int xcanfd_rx(struct net_device *ndev, int frame_base)
*/
if (dlc & XCAN_DLCR_EDL_MASK)
cf->len = can_dlc2len((dlc & XCAN_DLCR_DLC_MASK) >>
XCAN_DLCR_DLC_SHIFT);
else
- cf->len = get_can_dlc((dlc & XCAN_DLCR_DLC_MASK) >>
+ cf->len = can_get_cc_len((dlc & XCAN_DLCR_DLC_MASK) >>
XCAN_DLCR_DLC_SHIFT);
/* Change Xilinx CAN ID format to socketCAN ID format */
if (id_xcan & XCAN_IDR_IDE_MASK) {
/* The received frame is an Extended format frame */
diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index 41ff31795320..92463cda7ac8 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -96,18 +96,18 @@ static inline unsigned int can_bit_time(const struct can_bittiming *bt)
{
return CAN_SYNC_SEG + bt->prop_seg + bt->phase_seg1 + bt->phase_seg2;
}
/*
- * get_can_dlc(value) - helper macro to cast a given data length code (dlc)
- * to u8 and ensure the dlc value to be max. 8 bytes.
+ * can_get_cc_len(value) - convert a given data length code (dlc) of a
+ * Classical CAN frame into a valid data length of max. 8 bytes.
*
* To be used in the CAN netdriver receive path to ensure conformance with
* ISO 11898-1 Chapter 8.4.2.3 (DLC field)
*/
-#define get_can_dlc(i) (min_t(u8, (i), CAN_MAX_DLC))
-#define get_canfd_dlc(i) (min_t(u8, (i), CANFD_MAX_DLC))
+#define can_get_cc_len(dlc) (min_t(u8, (dlc), CAN_MAX_DLEN))
+#define get_canfd_dlc(dlc) (min_t(u8, (dlc), CANFD_MAX_DLC))
/* Check for outgoing skbs that have not been created by the CAN subsystem */
static inline bool can_skb_headroom_valid(struct net_device *dev,
struct sk_buff *skb)
{
--
2.28.0
^ permalink raw reply related [flat|nested] 13+ messages in thread
* [PATCH v4 3/7] can: remove obsolete get_canfd_dlc() macro
2020-11-09 10:26 [PATCH v4 0/7] Introduce optional DLC element for Classic CAN Oliver Hartkopp
2020-11-09 10:26 ` [PATCH v4 1/7] can: add optional DLC element to Classical CAN frame structure Oliver Hartkopp
2020-11-09 10:26 ` [PATCH v4 2/7] can: rename get_can_dlc() macro with can_get_cc_len() Oliver Hartkopp
@ 2020-11-09 10:26 ` Oliver Hartkopp
2020-11-09 10:26 ` [PATCH v4 4/7] can: replace can_dlc as variable/element for payload length Oliver Hartkopp
` (4 subsequent siblings)
7 siblings, 0 replies; 13+ messages in thread
From: Oliver Hartkopp @ 2020-11-09 10:26 UTC (permalink / raw)
To: linux-can, mkl, mailhol.vincent; +Cc: netdev, Oliver Hartkopp
The macro was always used together with can_dlc2len() which sanitizes the
given dlc value on its own.
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
---
drivers/net/can/flexcan.c | 2 +-
drivers/net/can/peak_canfd/peak_canfd.c | 2 +-
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c | 2 +-
drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c | 2 +-
drivers/net/can/usb/peak_usb/pcan_usb_fd.c | 2 +-
include/linux/can/dev.h | 1 -
include/linux/can/dev/peak_canfd.h | 2 +-
7 files changed, 6 insertions(+), 7 deletions(-)
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index b30e3171cbd0..d5ea33fdb93d 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -996,11 +996,11 @@ static struct sk_buff *flexcan_mailbox_read(struct can_rx_offload *offload,
cfd->can_id = ((reg_id >> 0) & CAN_EFF_MASK) | CAN_EFF_FLAG;
else
cfd->can_id = (reg_id >> 18) & CAN_SFF_MASK;
if (reg_ctrl & FLEXCAN_MB_CNT_EDL) {
- cfd->len = can_dlc2len(get_canfd_dlc((reg_ctrl >> 16) & 0xf));
+ cfd->len = can_dlc2len((reg_ctrl >> 16) & 0xf);
if (reg_ctrl & FLEXCAN_MB_CNT_BRS)
cfd->flags |= CANFD_BRS;
} else {
cfd->len = can_get_cc_len((reg_ctrl >> 16) & 0xf);
diff --git a/drivers/net/can/peak_canfd/peak_canfd.c b/drivers/net/can/peak_canfd/peak_canfd.c
index dc94ea6821c3..cc01db0c18b8 100644
--- a/drivers/net/can/peak_canfd/peak_canfd.c
+++ b/drivers/net/can/peak_canfd/peak_canfd.c
@@ -255,11 +255,11 @@ static int pucan_handle_can_rx(struct peak_canfd_priv *priv,
struct sk_buff *skb;
const u16 rx_msg_flags = le16_to_cpu(msg->flags);
u8 cf_len;
if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN)
- cf_len = can_dlc2len(get_canfd_dlc(pucan_msg_get_dlc(msg)));
+ cf_len = can_dlc2len(pucan_msg_get_dlc(msg));
else
cf_len = can_get_cc_len(pucan_msg_get_dlc(msg));
/* if this frame is an echo, */
if (rx_msg_flags & PUCAN_MSG_LOOPED_BACK) {
diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
index ae9e9bafba23..fdc245774c3e 100644
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
@@ -1403,11 +1403,11 @@ mcp251xfd_hw_rx_obj_to_skb(const struct mcp251xfd_priv *priv,
if (hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_BRS)
cfd->flags |= CANFD_BRS;
dlc = FIELD_GET(MCP251XFD_OBJ_FLAGS_DLC, hw_rx_obj->flags);
- cfd->len = can_dlc2len(get_canfd_dlc(dlc));
+ cfd->len = can_dlc2len(dlc);
} else {
if (hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_RTR)
cfd->can_id |= CAN_RTR_FLAG;
cfd->len = can_get_cc_len(FIELD_GET(MCP251XFD_OBJ_FLAGS_DLC,
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
index 1626f73337ab..b2d56bb1950a 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
@@ -1249,11 +1249,11 @@ static void kvaser_usb_hydra_rx_msg_ext(const struct kvaser_usb *dev,
if (flags & KVASER_USB_HYDRA_CF_FLAG_OVERRUN)
kvaser_usb_can_rx_over_error(priv->netdev);
if (flags & KVASER_USB_HYDRA_CF_FLAG_FDF) {
- cf->len = can_dlc2len(get_canfd_dlc(dlc));
+ cf->len = can_dlc2len(dlc);
if (flags & KVASER_USB_HYDRA_CF_FLAG_BRS)
cf->flags |= CANFD_BRS;
if (flags & KVASER_USB_HYDRA_CF_FLAG_ESI)
cf->flags |= CANFD_ESI;
} else {
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
index cf32bcfabba3..57dfa443c995 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
@@ -490,11 +490,11 @@ static int pcan_usb_fd_decode_canmsg(struct pcan_usb_fd_if *usb_if,
cfd->flags |= CANFD_BRS;
if (rx_msg_flags & PUCAN_MSG_ERROR_STATE_IND)
cfd->flags |= CANFD_ESI;
- cfd->len = can_dlc2len(get_canfd_dlc(pucan_msg_get_dlc(rm)));
+ cfd->len = can_dlc2len(pucan_msg_get_dlc(rm));
} else {
/* CAN 2.0 frame case */
skb = alloc_can_skb(netdev, (struct can_frame **)&cfd);
if (!skb)
return -ENOMEM;
diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index 92463cda7ac8..b2e8df8e4cb0 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -103,11 +103,10 @@ static inline unsigned int can_bit_time(const struct can_bittiming *bt)
*
* To be used in the CAN netdriver receive path to ensure conformance with
* ISO 11898-1 Chapter 8.4.2.3 (DLC field)
*/
#define can_get_cc_len(dlc) (min_t(u8, (dlc), CAN_MAX_DLEN))
-#define get_canfd_dlc(dlc) (min_t(u8, (dlc), CANFD_MAX_DLC))
/* Check for outgoing skbs that have not been created by the CAN subsystem */
static inline bool can_skb_headroom_valid(struct net_device *dev,
struct sk_buff *skb)
{
diff --git a/include/linux/can/dev/peak_canfd.h b/include/linux/can/dev/peak_canfd.h
index 5fd627e9da19..f38772fd0c07 100644
--- a/include/linux/can/dev/peak_canfd.h
+++ b/include/linux/can/dev/peak_canfd.h
@@ -280,11 +280,11 @@ static inline int pucan_msg_get_channel(const struct pucan_rx_msg *msg)
{
return msg->channel_dlc & 0xf;
}
/* return the dlc value from any received message channel_dlc field */
-static inline int pucan_msg_get_dlc(const struct pucan_rx_msg *msg)
+static inline u8 pucan_msg_get_dlc(const struct pucan_rx_msg *msg)
{
return msg->channel_dlc >> 4;
}
static inline int pucan_ermsg_get_channel(const struct pucan_error_msg *msg)
--
2.28.0
^ permalink raw reply related [flat|nested] 13+ messages in thread
* [PATCH v4 4/7] can: replace can_dlc as variable/element for payload length
2020-11-09 10:26 [PATCH v4 0/7] Introduce optional DLC element for Classic CAN Oliver Hartkopp
` (2 preceding siblings ...)
2020-11-09 10:26 ` [PATCH v4 3/7] can: remove obsolete get_canfd_dlc() macro Oliver Hartkopp
@ 2020-11-09 10:26 ` Oliver Hartkopp
2020-11-09 12:59 ` Vincent MAILHOL
2020-11-09 10:26 ` [PATCH v4 5/7] can: update documentation for DLC usage in Classical CAN Oliver Hartkopp
` (3 subsequent siblings)
7 siblings, 1 reply; 13+ messages in thread
From: Oliver Hartkopp @ 2020-11-09 10:26 UTC (permalink / raw)
To: linux-can, mkl, mailhol.vincent; +Cc: netdev, Oliver Hartkopp
The naming of can_dlc as element of struct can_frame and also as variable
name is misleading as it claims to be a 'data length CODE' but in reality
it always was a plain data length.
With the indroduction of a new 'len' element in struct can_frame we can now
remove can_dlc as name and make clear which of the former uses was a plain
length (-> 'len') or a data length code (-> 'dlc') value.
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
---
drivers/net/can/at91_can.c | 14 ++++----
drivers/net/can/c_can/c_can.c | 20 ++++++------
drivers/net/can/cc770/cc770.c | 14 ++++----
drivers/net/can/dev.c | 10 +++---
drivers/net/can/grcan.c | 10 +++---
drivers/net/can/ifi_canfd/ifi_canfd.c | 4 +--
drivers/net/can/janz-ican3.c | 20 ++++++------
drivers/net/can/kvaser_pciefd.c | 4 +--
drivers/net/can/m_can/m_can.c | 4 +--
drivers/net/can/mscan/mscan.c | 20 ++++++------
drivers/net/can/pch_can.c | 12 +++----
drivers/net/can/peak_canfd/peak_canfd.c | 12 +++----
drivers/net/can/rcar/rcar_can.c | 14 ++++----
drivers/net/can/rcar/rcar_canfd.c | 4 +--
drivers/net/can/rx-offload.c | 2 +-
drivers/net/can/sja1000/sja1000.c | 10 +++---
drivers/net/can/slcan.c | 32 +++++++++----------
drivers/net/can/softing/softing_fw.c | 2 +-
drivers/net/can/softing/softing_main.c | 14 ++++----
drivers/net/can/spi/hi311x.c | 20 ++++++------
drivers/net/can/spi/mcp251x.c | 18 +++++------
drivers/net/can/sun4i_can.c | 10 +++---
drivers/net/can/ti_hecc.c | 8 ++---
drivers/net/can/usb/ems_usb.c | 16 +++++-----
drivers/net/can/usb/esd_usb2.c | 16 +++++-----
drivers/net/can/usb/gs_usb.c | 14 ++++----
.../net/can/usb/kvaser_usb/kvaser_usb_core.c | 2 +-
.../net/can/usb/kvaser_usb/kvaser_usb_hydra.c | 16 +++++-----
.../net/can/usb/kvaser_usb/kvaser_usb_leaf.c | 22 ++++++-------
drivers/net/can/usb/mcba_usb.c | 10 +++---
drivers/net/can/usb/peak_usb/pcan_usb.c | 14 ++++----
drivers/net/can/usb/peak_usb/pcan_usb_fd.c | 10 +++---
drivers/net/can/usb/peak_usb/pcan_usb_pro.c | 14 ++++----
drivers/net/can/usb/ucan.c | 14 ++++----
drivers/net/can/usb/usb_8dev.c | 14 ++++----
drivers/net/can/xilinx_can.c | 10 +++---
include/linux/can/dev.h | 4 +--
net/can/af_can.c | 2 +-
net/can/gw.c | 2 +-
net/can/j1939/main.c | 4 +--
40 files changed, 231 insertions(+), 231 deletions(-)
diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c
index cf515e3134dc..342173a63d74 100644
--- a/drivers/net/can/at91_can.c
+++ b/drivers/net/can/at91_can.c
@@ -466,11 +466,11 @@ static netdev_tx_t at91_start_xmit(struct sk_buff *skb, struct net_device *dev)
netdev_err(dev, "BUG! TX buffer full when queue awake!\n");
return NETDEV_TX_BUSY;
}
reg_mid = at91_can_id_to_reg_mid(cf->can_id);
reg_mcr = ((cf->can_id & CAN_RTR_FLAG) ? AT91_MCR_MRTR : 0) |
- (cf->can_dlc << 16) | AT91_MCR_MTCR;
+ (cf->len << 16) | AT91_MCR_MTCR;
/* disable MB while writing ID (see datasheet) */
set_mb_mode(priv, mb, AT91_MB_MODE_DISABLED);
at91_write(priv, AT91_MID(mb), reg_mid);
set_mb_mode_prio(priv, mb, AT91_MB_MODE_TX, prio);
@@ -479,11 +479,11 @@ static netdev_tx_t at91_start_xmit(struct sk_buff *skb, struct net_device *dev)
at91_write(priv, AT91_MDH(mb), *(u32 *)(cf->data + 4));
/* This triggers transmission */
at91_write(priv, AT91_MCR(mb), reg_mcr);
- stats->tx_bytes += cf->can_dlc;
+ stats->tx_bytes += cf->len;
/* _NOTE_: subtract AT91_MB_TX_FIRST offset from mb! */
can_put_echo_skb(skb, dev, mb - get_mb_tx_first(priv));
/*
@@ -552,11 +552,11 @@ static void at91_rx_overflow_err(struct net_device *dev)
cf->can_id |= CAN_ERR_CRTL;
cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_receive_skb(skb);
}
/**
* at91_read_mb - read CAN msg from mailbox (lowlevel impl)
@@ -578,11 +578,11 @@ static void at91_read_mb(struct net_device *dev, unsigned int mb,
cf->can_id = ((reg_mid >> 0) & CAN_EFF_MASK) | CAN_EFF_FLAG;
else
cf->can_id = (reg_mid >> 18) & CAN_SFF_MASK;
reg_msr = at91_read(priv, AT91_MSR(mb));
- cf->can_dlc = can_get_cc_len((reg_msr >> 16) & 0xf);
+ cf->len = can_get_cc_len((reg_msr >> 16) & 0xf);
if (reg_msr & AT91_MSR_MRTR)
cf->can_id |= CAN_RTR_FLAG;
else {
*(u32 *)(cf->data + 0) = at91_read(priv, AT91_MDL(mb));
@@ -617,11 +617,11 @@ static void at91_read_msg(struct net_device *dev, unsigned int mb)
}
at91_read_mb(dev, mb, cf);
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_receive_skb(skb);
can_led_event(dev, CAN_LED_EVENT_RX);
}
@@ -778,11 +778,11 @@ static int at91_poll_err(struct net_device *dev, int quota, u32 reg_sr)
return 0;
at91_poll_err_frame(dev, cf, reg_sr);
dev->stats.rx_packets++;
- dev->stats.rx_bytes += cf->can_dlc;
+ dev->stats.rx_bytes += cf->len;
netif_receive_skb(skb);
return 1;
}
@@ -1045,11 +1045,11 @@ static void at91_irq_err(struct net_device *dev)
return;
at91_irq_err_state(dev, cf, new_state);
dev->stats.rx_packets++;
- dev->stats.rx_bytes += cf->can_dlc;
+ dev->stats.rx_bytes += cf->len;
netif_rx(skb);
priv->can.state = new_state;
}
diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index b36c69983f69..1a78d3196e8a 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -304,11 +304,11 @@ static void c_can_inval_msg_object(struct net_device *dev, int iface, int obj)
static void c_can_setup_tx_object(struct net_device *dev, int iface,
struct can_frame *frame, int idx)
{
struct c_can_priv *priv = netdev_priv(dev);
- u16 ctrl = IF_MCONT_TX | frame->can_dlc;
+ u16 ctrl = IF_MCONT_TX | frame->len;
bool rtr = frame->can_id & CAN_RTR_FLAG;
u32 arb = IF_ARB_MSGVAL;
int i;
if (frame->can_id & CAN_EFF_FLAG) {
@@ -337,19 +337,19 @@ static void c_can_setup_tx_object(struct net_device *dev, int iface,
priv->write_reg(priv, C_CAN_IFACE(MSGCTRL_REG, iface), ctrl);
if (priv->type == BOSCH_D_CAN) {
u32 data = 0, dreg = C_CAN_IFACE(DATA1_REG, iface);
- for (i = 0; i < frame->can_dlc; i += 4, dreg += 2) {
+ for (i = 0; i < frame->len; i += 4, dreg += 2) {
data = (u32)frame->data[i];
data |= (u32)frame->data[i + 1] << 8;
data |= (u32)frame->data[i + 2] << 16;
data |= (u32)frame->data[i + 3] << 24;
priv->write_reg32(priv, dreg, data);
}
} else {
- for (i = 0; i < frame->can_dlc; i += 2) {
+ for (i = 0; i < frame->len; i += 2) {
priv->write_reg(priv,
C_CAN_IFACE(DATA1_REG, iface) + i / 2,
frame->data[i] |
(frame->data[i + 1] << 8));
}
@@ -395,11 +395,11 @@ static int c_can_read_msg_object(struct net_device *dev, int iface, u32 ctrl)
if (!skb) {
stats->rx_dropped++;
return -ENOMEM;
}
- frame->can_dlc = can_get_cc_len(ctrl & 0x0F);
+ frame->len = can_get_cc_len(ctrl & 0x0F);
arb = priv->read_reg32(priv, C_CAN_IFACE(ARB1_REG, iface));
if (arb & IF_ARB_MSGXTD)
frame->can_id = (arb & CAN_EFF_MASK) | CAN_EFF_FLAG;
@@ -410,28 +410,28 @@ static int c_can_read_msg_object(struct net_device *dev, int iface, u32 ctrl)
frame->can_id |= CAN_RTR_FLAG;
} else {
int i, dreg = C_CAN_IFACE(DATA1_REG, iface);
if (priv->type == BOSCH_D_CAN) {
- for (i = 0; i < frame->can_dlc; i += 4, dreg += 2) {
+ for (i = 0; i < frame->len; i += 4, dreg += 2) {
data = priv->read_reg32(priv, dreg);
frame->data[i] = data;
frame->data[i + 1] = data >> 8;
frame->data[i + 2] = data >> 16;
frame->data[i + 3] = data >> 24;
}
} else {
- for (i = 0; i < frame->can_dlc; i += 2, dreg++) {
+ for (i = 0; i < frame->len; i += 2, dreg++) {
data = priv->read_reg(priv, dreg);
frame->data[i] = data;
frame->data[i + 1] = data >> 8;
}
}
}
stats->rx_packets++;
- stats->rx_bytes += frame->can_dlc;
+ stats->rx_bytes += frame->len;
netif_receive_skb(skb);
return 0;
}
@@ -473,11 +473,11 @@ static netdev_tx_t c_can_start_xmit(struct sk_buff *skb,
* Store the message in the interface so we can call
* can_put_echo_skb(). We must do this before we enable
* transmit as we might race against do_tx().
*/
c_can_setup_tx_object(dev, IF_TX, frame, idx);
- priv->dlc[idx] = frame->can_dlc;
+ priv->dlc[idx] = frame->len;
can_put_echo_skb(skb, dev, idx);
/* Update the active bits */
atomic_add((1 << idx), &priv->tx_active);
/* Start transmission */
@@ -975,11 +975,11 @@ static int c_can_handle_state_change(struct net_device *dev,
default:
break;
}
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_receive_skb(skb);
return 1;
}
@@ -1045,11 +1045,11 @@ static int c_can_handle_bus_err(struct net_device *dev,
default:
break;
}
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_receive_skb(skb);
return 1;
}
static int c_can_poll(struct napi_struct *napi, int quota)
diff --git a/drivers/net/can/cc770/cc770.c b/drivers/net/can/cc770/cc770.c
index 55ebf006484e..48cc99959257 100644
--- a/drivers/net/can/cc770/cc770.c
+++ b/drivers/net/can/cc770/cc770.c
@@ -388,11 +388,11 @@ static void cc770_tx(struct net_device *dev, int mo)
struct can_frame *cf = (struct can_frame *)priv->tx_skb->data;
u8 dlc, rtr;
u32 id;
int i;
- dlc = cf->can_dlc;
+ dlc = cf->len;
id = cf->can_id;
rtr = cf->can_id & CAN_RTR_FLAG ? 0 : MSGCFG_DIR;
cc770_write_reg(priv, msgobj[mo].ctrl0,
MSGVAL_RES | TXIE_RES | RXIE_RES | INTPND_RES);
@@ -468,11 +468,11 @@ static void cc770_rx(struct net_device *dev, unsigned int mo, u8 ctrl1)
* frame. Therefore we set it to 0.
*/
cf->can_id = CAN_RTR_FLAG;
if (config & MSGCFG_XTD)
cf->can_id |= CAN_EFF_FLAG;
- cf->can_dlc = 0;
+ cf->len = 0;
} else {
if (config & MSGCFG_XTD) {
id = cc770_read_reg(priv, msgobj[mo].id[3]);
id |= cc770_read_reg(priv, msgobj[mo].id[2]) << 8;
id |= cc770_read_reg(priv, msgobj[mo].id[1]) << 16;
@@ -484,17 +484,17 @@ static void cc770_rx(struct net_device *dev, unsigned int mo, u8 ctrl1)
id |= cc770_read_reg(priv, msgobj[mo].id[0]) << 8;
id >>= 5;
}
cf->can_id = id;
- cf->can_dlc = can_get_cc_len((config & 0xf0) >> 4);
- for (i = 0; i < cf->can_dlc; i++)
+ cf->len = can_get_cc_len((config & 0xf0) >> 4);
+ for (i = 0; i < cf->len; i++)
cf->data[i] = cc770_read_reg(priv, msgobj[mo].data[i]);
}
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
}
static int cc770_err(struct net_device *dev, u8 status)
{
@@ -570,11 +570,11 @@ static int cc770_err(struct net_device *dev, u8 status)
}
}
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
return 0;
}
@@ -697,11 +697,11 @@ static void cc770_tx_interrupt(struct net_device *dev, unsigned int o)
cc770_tx(dev, mo);
return;
}
cf = (struct can_frame *)priv->tx_skb->data;
- stats->tx_bytes += cf->can_dlc;
+ stats->tx_bytes += cf->len;
stats->tx_packets++;
can_put_echo_skb(priv->tx_skb, dev, 0);
can_get_echo_skb(dev, 0);
priv->tx_skb = NULL;
diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
index 6dee4f8f2024..566501a02b91 100644
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -28,14 +28,14 @@ MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
/* CAN DLC to real data length conversion helpers */
static const u8 dlc2len[] = {0, 1, 2, 3, 4, 5, 6, 7,
8, 12, 16, 20, 24, 32, 48, 64};
-/* get data length from can_dlc with sanitized can_dlc */
-u8 can_dlc2len(u8 can_dlc)
+/* get data length from raw data length code (DLC) */
+u8 can_dlc2len(u8 dlc)
{
- return dlc2len[can_dlc & 0x0F];
+ return dlc2len[dlc & 0x0F];
}
EXPORT_SYMBOL_GPL(can_dlc2len);
static const u8 len2dlc[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, /* 0 - 8 */
9, 9, 9, 9, /* 9 - 12 */
@@ -593,11 +593,11 @@ static void can_restart(struct net_device *dev)
cf->can_id |= CAN_ERR_RESTARTED;
netif_rx(skb);
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
restart:
netdev_dbg(dev, "restarted\n");
priv->can_stats.restarts++;
@@ -735,11 +735,11 @@ struct sk_buff *alloc_can_err_skb(struct net_device *dev, struct can_frame **cf)
skb = alloc_can_skb(dev, cf);
if (unlikely(!skb))
return NULL;
(*cf)->can_id = CAN_ERR_FLAG;
- (*cf)->can_dlc = CAN_ERR_DLC;
+ (*cf)->len = CAN_ERR_DLC;
return skb;
}
EXPORT_SYMBOL_GPL(alloc_can_err_skb);
diff --git a/drivers/net/can/grcan.c b/drivers/net/can/grcan.c
index 56e6902b3121..8a1ad50cb5b5 100644
--- a/drivers/net/can/grcan.c
+++ b/drivers/net/can/grcan.c
@@ -1199,25 +1199,25 @@ static int grcan_receive(struct net_device *dev, int budget)
cf->can_id |= CAN_EFF_FLAG;
} else {
cf->can_id = ((slot[0] & GRCAN_MSG_BID)
>> GRCAN_MSG_BID_BIT);
}
- cf->can_dlc = can_get_cc_len((slot[1] & GRCAN_MSG_DLC)
+ cf->len = can_get_cc_len((slot[1] & GRCAN_MSG_DLC)
>> GRCAN_MSG_DLC_BIT);
if (rtr) {
cf->can_id |= CAN_RTR_FLAG;
} else {
- for (i = 0; i < cf->can_dlc; i++) {
+ for (i = 0; i < cf->len; i++) {
j = GRCAN_MSG_DATA_SLOT_INDEX(i);
shift = GRCAN_MSG_DATA_SHIFT(i);
cf->data[i] = (u8)(slot[j] >> shift);
}
}
/* Update statistics and read pointer */
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_receive_skb(skb);
rd = grcan_ring_add(rd, GRCAN_MSG_SIZE, dma->rx.size);
}
@@ -1397,11 +1397,11 @@ static netdev_tx_t grcan_start_xmit(struct sk_buff *skb,
/* Convert and write CAN message to DMA buffer */
eff = cf->can_id & CAN_EFF_FLAG;
rtr = cf->can_id & CAN_RTR_FLAG;
id = cf->can_id & (eff ? CAN_EFF_MASK : CAN_SFF_MASK);
- dlc = cf->can_dlc;
+ dlc = cf->len;
if (eff)
tmp = (id << GRCAN_MSG_EID_BIT) & GRCAN_MSG_EID;
else
tmp = (id << GRCAN_MSG_BID_BIT) & GRCAN_MSG_BID;
slot[0] = (eff ? GRCAN_MSG_IDE : 0) | (rtr ? GRCAN_MSG_RTR : 0) | tmp;
@@ -1445,11 +1445,11 @@ static netdev_tx_t grcan_start_xmit(struct sk_buff *skb,
* as ownership of the skb is passed on by calling can_put_echo_skb.
* Returning NETDEV_TX_BUSY or accessing skb or cf after a call to
* can_put_echo_skb would be an error unless other measures are
* taken.
*/
- priv->txdlc[slotindex] = cf->can_dlc; /* Store dlc for statistics */
+ priv->txdlc[slotindex] = cf->len; /* Store dlc for statistics */
can_put_echo_skb(skb, dev, slotindex);
/* Make sure everything is written before allowing hardware to
* read from the memory
*/
diff --git a/drivers/net/can/ifi_canfd/ifi_canfd.c b/drivers/net/can/ifi_canfd/ifi_canfd.c
index 67f6d72cdc71..393e116ccd6e 100644
--- a/drivers/net/can/ifi_canfd/ifi_canfd.c
+++ b/drivers/net/can/ifi_canfd/ifi_canfd.c
@@ -429,11 +429,11 @@ static int ifi_canfd_handle_lec_err(struct net_device *ndev)
writel(IFI_CANFD_INTERRUPT_ERROR_COUNTER,
priv->base + IFI_CANFD_INTERRUPT);
writel(IFI_CANFD_ERROR_CTR_ER_ENABLE, priv->base + IFI_CANFD_ERROR_CTR);
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_receive_skb(skb);
return 1;
}
@@ -521,11 +521,11 @@ static int ifi_canfd_handle_state_change(struct net_device *ndev,
default:
break;
}
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_receive_skb(skb);
return 1;
}
diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
index a0af78b15319..40e9f8be1577 100644
--- a/drivers/net/can/janz-ican3.c
+++ b/drivers/net/can/janz-ican3.c
@@ -914,14 +914,14 @@ static void ican3_to_can_frame(struct ican3_dev *mod,
if (desc->data[1] & ICAN3_SFF_RTR)
cf->can_id |= CAN_RTR_FLAG;
cf->can_id |= desc->data[0] << 3;
cf->can_id |= (desc->data[1] & 0xe0) >> 5;
- cf->can_dlc = can_get_cc_len(desc->data[1] & ICAN3_CAN_DLC_MASK);
- memcpy(cf->data, &desc->data[2], cf->can_dlc);
+ cf->len = can_get_cc_len(desc->data[1] & ICAN3_CAN_DLC_MASK);
+ memcpy(cf->data, &desc->data[2], cf->len);
} else {
- cf->can_dlc = can_get_cc_len(desc->data[0] & ICAN3_CAN_DLC_MASK);
+ cf->len = can_get_cc_len(desc->data[0] & ICAN3_CAN_DLC_MASK);
if (desc->data[0] & ICAN3_EFF_RTR)
cf->can_id |= CAN_RTR_FLAG;
if (desc->data[0] & ICAN3_EFF) {
cf->can_id |= CAN_EFF_FLAG;
@@ -932,11 +932,11 @@ static void ican3_to_can_frame(struct ican3_dev *mod,
} else {
cf->can_id |= desc->data[2] << 3; /* 10-3 */
cf->can_id |= desc->data[3] >> 5; /* 2-0 */
}
- memcpy(cf->data, &desc->data[6], cf->can_dlc);
+ memcpy(cf->data, &desc->data[6], cf->len);
}
}
static void can_frame_to_ican3(struct ican3_dev *mod,
struct can_frame *cf,
@@ -945,11 +945,11 @@ static void can_frame_to_ican3(struct ican3_dev *mod,
/* clear out any stale data in the descriptor */
memset(desc->data, 0, sizeof(desc->data));
/* we always use the extended format, with the ECHO flag set */
desc->command = ICAN3_CAN_TYPE_EFF;
- desc->data[0] |= cf->can_dlc;
+ desc->data[0] |= cf->len;
desc->data[1] |= ICAN3_ECHO;
/* support single transmission (no retries) mode */
if (mod->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
desc->data[1] |= ICAN3_SNGL;
@@ -968,11 +968,11 @@ static void can_frame_to_ican3(struct ican3_dev *mod,
desc->data[2] = (cf->can_id & 0x7F8) >> 3; /* bits 10-3 */
desc->data[3] = (cf->can_id & 0x007) << 5; /* bits 2-0 */
}
/* copy the data bits into the descriptor */
- memcpy(&desc->data[6], cf->data, cf->can_dlc);
+ memcpy(&desc->data[6], cf->data, cf->len);
}
/*
* Interrupt Handling
*/
@@ -1292,11 +1292,11 @@ static unsigned int ican3_get_echo_skb(struct ican3_dev *mod)
netdev_err(mod->ndev, "BUG: echo skb not occupied\n");
return 0;
}
cf = (struct can_frame *)skb->data;
- dlc = cf->can_dlc;
+ dlc = cf->len;
/* check flag whether this packet has to be looped back */
if (skb->pkt_type != PACKET_LOOPBACK) {
kfree_skb(skb);
return dlc;
@@ -1330,14 +1330,14 @@ static bool ican3_echo_skb_matches(struct ican3_dev *mod, struct sk_buff *skb)
echo_cf = (struct can_frame *)echo_skb->data;
if (cf->can_id != echo_cf->can_id)
return false;
- if (cf->can_dlc != echo_cf->can_dlc)
+ if (cf->len != echo_cf->len)
return false;
- return memcmp(cf->data, echo_cf->data, cf->can_dlc) == 0;
+ return memcmp(cf->data, echo_cf->data, cf->len) == 0;
}
/*
* Check that there is room in the TX ring to transmit another skb
*
@@ -1419,11 +1419,11 @@ static int ican3_recv_skb(struct ican3_dev *mod)
goto err_noalloc;
}
/* update statistics, receive the skb */
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_receive_skb(skb);
err_noalloc:
/* toggle the valid bit and return the descriptor to the ring */
desc.control ^= DESC_VALID;
diff --git a/drivers/net/can/kvaser_pciefd.c b/drivers/net/can/kvaser_pciefd.c
index 6f766918211a..8b5f75209b09 100644
--- a/drivers/net/can/kvaser_pciefd.c
+++ b/drivers/net/can/kvaser_pciefd.c
@@ -1297,11 +1297,11 @@ static int kvaser_pciefd_rx_error_frame(struct kvaser_pciefd_can *can,
cf->data[6] = bec.txerr;
cf->data[7] = bec.rxerr;
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
return 0;
}
@@ -1496,11 +1496,11 @@ static void kvaser_pciefd_handle_nack_packet(struct kvaser_pciefd_can *can,
cf->can_id |= CAN_ERR_ACK;
}
if (skb) {
cf->can_id |= CAN_ERR_BUSERROR;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
stats->rx_packets++;
netif_rx(skb);
} else {
stats->rx_dropped++;
netdev_warn(can->can.dev, "No memory left for err_skb\n");
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 34cbb358731c..e34cbf02ccec 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -594,11 +594,11 @@ static int m_can_handle_lec_err(struct net_device *dev,
default:
break;
}
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_receive_skb(skb);
return 1;
}
@@ -721,11 +721,11 @@ static int m_can_handle_state_change(struct net_device *dev,
default:
break;
}
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_receive_skb(skb);
return 1;
}
diff --git a/drivers/net/can/mscan/mscan.c b/drivers/net/can/mscan/mscan.c
index 153650b8341a..a3100d03b80b 100644
--- a/drivers/net/can/mscan/mscan.c
+++ b/drivers/net/can/mscan/mscan.c
@@ -248,20 +248,20 @@ static netdev_tx_t mscan_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (!rtr) {
void __iomem *data = ®s->tx.dsr1_0;
u16 *payload = (u16 *)frame->data;
- for (i = 0; i < frame->can_dlc / 2; i++) {
+ for (i = 0; i < frame->len / 2; i++) {
out_be16(data, *payload++);
data += 2 + _MSCAN_RESERVED_DSR_SIZE;
}
/* write remaining byte if necessary */
- if (frame->can_dlc & 1)
- out_8(data, frame->data[frame->can_dlc - 1]);
+ if (frame->len & 1)
+ out_8(data, frame->data[frame->len - 1]);
}
- out_8(®s->tx.dlr, frame->can_dlc);
+ out_8(®s->tx.dlr, frame->len);
out_8(®s->tx.tbpr, priv->cur_pri);
/* Start transmission. */
out_8(®s->cantflg, 1 << buf_id);
@@ -310,23 +310,23 @@ static void mscan_get_rx_frame(struct net_device *dev, struct can_frame *frame)
frame->can_id |= can_id >> 1;
if (can_id & 1)
frame->can_id |= CAN_RTR_FLAG;
- frame->can_dlc = can_get_cc_len(in_8(®s->rx.dlr) & 0xf);
+ frame->len = can_get_cc_len(in_8(®s->rx.dlr) & 0xf);
if (!(frame->can_id & CAN_RTR_FLAG)) {
void __iomem *data = ®s->rx.dsr1_0;
u16 *payload = (u16 *)frame->data;
- for (i = 0; i < frame->can_dlc / 2; i++) {
+ for (i = 0; i < frame->len / 2; i++) {
*payload++ = in_be16(data);
data += 2 + _MSCAN_RESERVED_DSR_SIZE;
}
/* read remaining byte if necessary */
- if (frame->can_dlc & 1)
- frame->data[frame->can_dlc - 1] = in_8(data);
+ if (frame->len & 1)
+ frame->data[frame->len - 1] = in_8(data);
}
out_8(®s->canrflg, MSCAN_RXF);
}
@@ -370,11 +370,11 @@ static void mscan_get_err_frame(struct net_device *dev, struct can_frame *frame,
}
can_bus_off(dev);
}
}
priv->shadow_statflg = canrflg & MSCAN_STAT_MSK;
- frame->can_dlc = CAN_ERR_DLC;
+ frame->len = CAN_ERR_DLC;
out_8(®s->canrflg, MSCAN_ERR_IF);
}
static int mscan_rx_poll(struct napi_struct *napi, int quota)
{
@@ -405,11 +405,11 @@ static int mscan_rx_poll(struct napi_struct *napi, int quota)
mscan_get_rx_frame(dev, frame);
else if (canrflg & MSCAN_ERR_IF)
mscan_get_err_frame(dev, frame, canrflg);
stats->rx_packets++;
- stats->rx_bytes += frame->can_dlc;
+ stats->rx_bytes += frame->len;
work_done++;
netif_receive_skb(skb);
}
if (work_done < quota) {
diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
index 86c610d7033f..b4cc5177a907 100644
--- a/drivers/net/can/pch_can.c
+++ b/drivers/net/can/pch_can.c
@@ -561,11 +561,11 @@ static void pch_can_error(struct net_device *ndev, u32 status)
priv->can.state = state;
netif_receive_skb(skb);
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
}
static irqreturn_t pch_can_interrupt(int irq, void *dev_id)
{
struct net_device *ndev = (struct net_device *)dev_id;
@@ -681,24 +681,24 @@ static int pch_can_rx_normal(struct net_device *ndev, u32 obj_num, int quota)
}
if (id2 & PCH_ID2_DIR)
cf->can_id |= CAN_RTR_FLAG;
- cf->can_dlc = can_get_cc_len((ioread32(&priv->regs->
+ cf->len = can_get_cc_len((ioread32(&priv->regs->
ifregs[0].mcont)) & 0xF);
- for (i = 0; i < cf->can_dlc; i += 2) {
+ for (i = 0; i < cf->len; i += 2) {
data_reg = ioread16(&priv->regs->ifregs[0].data[i / 2]);
cf->data[i] = data_reg;
cf->data[i + 1] = data_reg >> 8;
}
netif_receive_skb(skb);
rcv_pkts++;
stats->rx_packets++;
quota--;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
pch_fifo_thresh(priv, obj_num);
obj_num++;
} while (quota > 0);
@@ -917,19 +917,19 @@ static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev)
id2 |= PCH_ID2_DIR;
iowrite32(id2, &priv->regs->ifregs[1].id2);
/* Copy data to register */
- for (i = 0; i < cf->can_dlc; i += 2) {
+ for (i = 0; i < cf->len; i += 2) {
iowrite16(cf->data[i] | (cf->data[i + 1] << 8),
&priv->regs->ifregs[1].data[i / 2]);
}
can_put_echo_skb(skb, ndev, tx_obj_no - PCH_RX_OBJ_END - 1);
/* Set the size of the data. Update if2_mcont */
- iowrite32(cf->can_dlc | PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_TXRQXT |
+ iowrite32(cf->len | PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_TXRQXT |
PCH_IF_MCONT_TXIE, &priv->regs->ifregs[1].mcont);
pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, tx_obj_no);
return NETDEV_TX_OK;
diff --git a/drivers/net/can/peak_canfd/peak_canfd.c b/drivers/net/can/peak_canfd/peak_canfd.c
index cc01db0c18b8..c25cb53eba4e 100644
--- a/drivers/net/can/peak_canfd/peak_canfd.c
+++ b/drivers/net/can/peak_canfd/peak_canfd.c
@@ -408,11 +408,11 @@ static int pucan_handle_status(struct peak_canfd_priv *priv,
stats->rx_dropped++;
return -ENOMEM;
}
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
pucan_netif_rx(skb, msg->ts_low, msg->ts_high);
return 0;
}
@@ -436,11 +436,11 @@ static int pucan_handle_cache_critical(struct peak_canfd_priv *priv)
cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
cf->data[6] = priv->bec.txerr;
cf->data[7] = priv->bec.rxerr;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
stats->rx_packets++;
netif_rx(skb);
return 0;
}
@@ -650,11 +650,11 @@ static netdev_tx_t peak_canfd_start_xmit(struct sk_buff *skb,
struct pucan_tx_msg *msg;
u16 msg_size, msg_flags;
unsigned long flags;
bool should_stop_tx_queue;
int room_left;
- u8 can_dlc;
+ u8 len;
if (can_dropped_invalid_skb(ndev, skb))
return NETDEV_TX_OK;
msg_size = ALIGN(sizeof(*msg) + cf->len, 4);
@@ -680,22 +680,22 @@ static netdev_tx_t peak_canfd_start_xmit(struct sk_buff *skb,
msg->can_id = cpu_to_le32(cf->can_id & CAN_SFF_MASK);
}
if (can_is_canfd_skb(skb)) {
/* CAN FD frame format */
- can_dlc = can_len2dlc(cf->len);
+ len = can_len2dlc(cf->len);
msg_flags |= PUCAN_MSG_EXT_DATA_LEN;
if (cf->flags & CANFD_BRS)
msg_flags |= PUCAN_MSG_BITRATE_SWITCH;
if (cf->flags & CANFD_ESI)
msg_flags |= PUCAN_MSG_ERROR_STATE_IND;
} else {
/* CAN 2.0 frame format */
- can_dlc = cf->len;
+ len = cf->len;
if (cf->can_id & CAN_RTR_FLAG)
msg_flags |= PUCAN_MSG_RTR;
}
@@ -705,11 +705,11 @@ static netdev_tx_t peak_canfd_start_xmit(struct sk_buff *skb,
/* set driver specific bit to differentiate with application loopback */
if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
msg_flags |= PUCAN_MSG_SELF_RECEIVE;
msg->flags = cpu_to_le16(msg_flags);
- msg->channel_dlc = PUCAN_MSG_CHANNEL_DLC(priv->index, can_dlc);
+ msg->channel_dlc = PUCAN_MSG_CHANNEL_DLC(priv->index, len);
memcpy(msg->d, cf->data, cf->len);
/* struct msg client field is used as an index in the echo skbs ring */
msg->client = priv->echo_idx;
diff --git a/drivers/net/can/rcar/rcar_can.c b/drivers/net/can/rcar/rcar_can.c
index 874cd0badf0f..db95f2ddb813 100644
--- a/drivers/net/can/rcar/rcar_can.c
+++ b/drivers/net/can/rcar/rcar_can.c
@@ -362,11 +362,11 @@ static void rcar_can_error(struct net_device *ndev)
}
}
if (skb) {
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
}
}
static void rcar_can_tx_done(struct net_device *ndev)
@@ -605,20 +605,20 @@ static netdev_tx_t rcar_can_start_xmit(struct sk_buff *skb,
data = (cf->can_id & CAN_SFF_MASK) << RCAR_CAN_SID_SHIFT;
if (cf->can_id & CAN_RTR_FLAG) { /* Remote transmission request */
data |= RCAR_CAN_RTR;
} else {
- for (i = 0; i < cf->can_dlc; i++)
+ for (i = 0; i < cf->len; i++)
writeb(cf->data[i],
&priv->regs->mb[RCAR_CAN_TX_FIFO_MBX].data[i]);
}
writel(data, &priv->regs->mb[RCAR_CAN_TX_FIFO_MBX].id);
- writeb(cf->can_dlc, &priv->regs->mb[RCAR_CAN_TX_FIFO_MBX].dlc);
+ writeb(cf->len, &priv->regs->mb[RCAR_CAN_TX_FIFO_MBX].dlc);
- priv->tx_dlc[priv->tx_head % RCAR_CAN_FIFO_DEPTH] = cf->can_dlc;
+ priv->tx_dlc[priv->tx_head % RCAR_CAN_FIFO_DEPTH] = cf->len;
can_put_echo_skb(skb, ndev, priv->tx_head % RCAR_CAN_FIFO_DEPTH);
priv->tx_head++;
/* Start Tx: write 0xff to the TFPCR register to increment
* the CPU-side pointer for the transmit FIFO to the next
* mailbox location
@@ -657,22 +657,22 @@ static void rcar_can_rx_pkt(struct rcar_can_priv *priv)
cf->can_id = (data & CAN_EFF_MASK) | CAN_EFF_FLAG;
else
cf->can_id = (data >> RCAR_CAN_SID_SHIFT) & CAN_SFF_MASK;
dlc = readb(&priv->regs->mb[RCAR_CAN_RX_FIFO_MBX].dlc);
- cf->can_dlc = can_get_cc_len(dlc);
+ cf->len = can_get_cc_len(dlc);
if (data & RCAR_CAN_RTR) {
cf->can_id |= CAN_RTR_FLAG;
} else {
- for (dlc = 0; dlc < cf->can_dlc; dlc++)
+ for (dlc = 0; dlc < cf->len; dlc++)
cf->data[dlc] =
readb(&priv->regs->mb[RCAR_CAN_RX_FIFO_MBX].data[dlc]);
}
can_led_event(priv->ndev, CAN_LED_EVENT_RX);
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
stats->rx_packets++;
netif_receive_skb(skb);
}
static int rcar_can_rx_poll(struct napi_struct *napi, int quota)
diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index 7fc885dbdf56..8bed84853d17 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -1023,11 +1023,11 @@ static void rcar_canfd_error(struct net_device *ndev, u32 cerfl,
/* Clear channel error interrupts that are handled */
rcar_canfd_write(priv->base, RCANFD_CERFL(ch),
RCANFD_CERFL_ERR(~cerfl));
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
}
static void rcar_canfd_tx_done(struct net_device *ndev)
{
@@ -1132,11 +1132,11 @@ static void rcar_canfd_state_change(struct net_device *ndev,
tx_state = txerr >= rxerr ? state : 0;
rx_state = txerr <= rxerr ? state : 0;
can_change_state(ndev, cf, tx_state, rx_state);
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
}
}
static irqreturn_t rcar_canfd_channel_interrupt(int irq, void *dev_id)
diff --git a/drivers/net/can/rx-offload.c b/drivers/net/can/rx-offload.c
index 6e95193b215b..450c5cfcb3fc 100644
--- a/drivers/net/can/rx-offload.c
+++ b/drivers/net/can/rx-offload.c
@@ -53,11 +53,11 @@ static int can_rx_offload_napi_poll(struct napi_struct *napi, int quota)
(skb = skb_dequeue(&offload->skb_queue))) {
struct can_frame *cf = (struct can_frame *)skb->data;
work_done++;
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_receive_skb(skb);
}
if (work_done < quota) {
napi_complete_done(napi, work_done);
diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c
index ddb09172c1af..507b4c0742ac 100644
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -293,11 +293,11 @@ static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
if (can_dropped_invalid_skb(dev, skb))
return NETDEV_TX_OK;
netif_stop_queue(dev);
- fi = dlc = cf->can_dlc;
+ fi = dlc = cf->len;
id = cf->can_id;
if (id & CAN_RTR_FLAG)
fi |= SJA1000_FI_RTR;
@@ -365,25 +365,25 @@ static void sja1000_rx(struct net_device *dev)
dreg = SJA1000_SFF_BUF;
id = (priv->read_reg(priv, SJA1000_ID1) << 3)
| (priv->read_reg(priv, SJA1000_ID2) >> 5);
}
- cf->can_dlc = can_get_cc_len(fi & 0x0F);
+ cf->len = can_get_cc_len(fi & 0x0F);
if (fi & SJA1000_FI_RTR) {
id |= CAN_RTR_FLAG;
} else {
- for (i = 0; i < cf->can_dlc; i++)
+ for (i = 0; i < cf->len; i++)
cf->data[i] = priv->read_reg(priv, dreg++);
}
cf->can_id = id;
/* release receive buffer */
sja1000_write_cmdreg(priv, CMD_RRB);
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
can_led_event(dev, CAN_LED_EVENT_RX);
}
@@ -488,11 +488,11 @@ static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
if(state == CAN_STATE_BUS_OFF)
can_bus_off(dev);
}
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
return 0;
}
diff --git a/drivers/net/can/slcan.c b/drivers/net/can/slcan.c
index b4a39f0449ba..a1bd1be09548 100644
--- a/drivers/net/can/slcan.c
+++ b/drivers/net/can/slcan.c
@@ -104,12 +104,12 @@ static struct net_device **slcan_devs;
* SLCAN ENCAPSULATION FORMAT *
************************************************************************/
/*
* A CAN frame has a can_id (11 bit standard frame format OR 29 bit extended
- * frame format) a data length code (can_dlc) which can be from 0 to 8
- * and up to <can_dlc> data bytes as payload.
+ * frame format) a data length code (len) which can be from 0 to 8
+ * and up to <len> data bytes as payload.
* Additionally a CAN frame may become a remote transmission frame if the
* RTR-bit is set. This causes another ECU to send a CAN frame with the
* given can_id.
*
* The SLCAN ASCII representation of these different frame types is:
@@ -126,14 +126,14 @@ static struct net_device **slcan_devs;
* The <dlc> is a one byte ASCII number ('0' - '8')
* The <data> section has at much ASCII Hex bytes as defined by the <dlc>
*
* Examples:
*
- * t1230 : can_id 0x123, can_dlc 0, no data
- * t4563112233 : can_id 0x456, can_dlc 3, data 0x11 0x22 0x33
- * T12ABCDEF2AA55 : extended can_id 0x12ABCDEF, can_dlc 2, data 0xAA 0x55
- * r1230 : can_id 0x123, can_dlc 0, no data, remote transmission request
+ * t1230 : can_id 0x123, len 0, no data
+ * t4563112233 : can_id 0x456, len 3, data 0x11 0x22 0x33
+ * T12ABCDEF2AA55 : extended can_id 0x12ABCDEF, len 2, data 0xAA 0x55
+ * r1230 : can_id 0x123, len 0, no data, remote transmission request
*
*/
/************************************************************************
* STANDARD SLCAN DECAPSULATION *
@@ -154,22 +154,22 @@ static void slc_bump(struct slcan *sl)
case 'r':
cf.can_id = CAN_RTR_FLAG;
fallthrough;
case 't':
/* store dlc ASCII value and terminate SFF CAN ID string */
- cf.can_dlc = sl->rbuff[SLC_CMD_LEN + SLC_SFF_ID_LEN];
+ cf.len = sl->rbuff[SLC_CMD_LEN + SLC_SFF_ID_LEN];
sl->rbuff[SLC_CMD_LEN + SLC_SFF_ID_LEN] = 0;
/* point to payload data behind the dlc */
cmd += SLC_CMD_LEN + SLC_SFF_ID_LEN + 1;
break;
case 'R':
cf.can_id = CAN_RTR_FLAG;
fallthrough;
case 'T':
cf.can_id |= CAN_EFF_FLAG;
/* store dlc ASCII value and terminate EFF CAN ID string */
- cf.can_dlc = sl->rbuff[SLC_CMD_LEN + SLC_EFF_ID_LEN];
+ cf.len = sl->rbuff[SLC_CMD_LEN + SLC_EFF_ID_LEN];
sl->rbuff[SLC_CMD_LEN + SLC_EFF_ID_LEN] = 0;
/* point to payload data behind the dlc */
cmd += SLC_CMD_LEN + SLC_EFF_ID_LEN + 1;
break;
default:
@@ -179,19 +179,19 @@ static void slc_bump(struct slcan *sl)
if (kstrtou32(sl->rbuff + SLC_CMD_LEN, 16, &tmpid))
return;
cf.can_id |= tmpid;
- /* get can_dlc from sanitized ASCII value */
- if (cf.can_dlc >= '0' && cf.can_dlc < '9')
- cf.can_dlc -= '0';
+ /* get len from sanitized ASCII value */
+ if (cf.len >= '0' && cf.len < '9')
+ cf.len -= '0';
else
return;
/* RTR frames may have a dlc > 0 but they never have any data bytes */
if (!(cf.can_id & CAN_RTR_FLAG)) {
- for (i = 0; i < cf.can_dlc; i++) {
+ for (i = 0; i < cf.len; i++) {
tmp = hex_to_bin(*cmd++);
if (tmp < 0)
return;
cf.data[i] = (tmp << 4);
tmp = hex_to_bin(*cmd++);
@@ -216,11 +216,11 @@ static void slc_bump(struct slcan *sl)
can_skb_prv(skb)->skbcnt = 0;
skb_put_data(skb, &cf, sizeof(struct can_frame));
sl->dev->stats.rx_packets++;
- sl->dev->stats.rx_bytes += cf.can_dlc;
+ sl->dev->stats.rx_bytes += cf.len;
netif_rx_ni(skb);
}
/* parse tty input stream */
static void slcan_unesc(struct slcan *sl, unsigned char s)
@@ -280,15 +280,15 @@ static void slc_encaps(struct slcan *sl, struct can_frame *cf)
id >>= 4;
}
pos += (cf->can_id & CAN_EFF_FLAG) ? SLC_EFF_ID_LEN : SLC_SFF_ID_LEN;
- *pos++ = cf->can_dlc + '0';
+ *pos++ = cf->len + '0';
/* RTR frames may have a dlc > 0 but they never have any data bytes */
if (!(cf->can_id & CAN_RTR_FLAG)) {
- for (i = 0; i < cf->can_dlc; i++)
+ for (i = 0; i < cf->len; i++)
pos = hex_byte_pack_upper(pos, cf->data[i]);
}
*pos++ = '\r';
@@ -302,11 +302,11 @@ static void slc_encaps(struct slcan *sl, struct can_frame *cf)
*/
set_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
actual = sl->tty->ops->write(sl->tty, sl->xbuff, pos - sl->xbuff);
sl->xleft = (pos - sl->xbuff) - actual;
sl->xhead = sl->xbuff + actual;
- sl->dev->stats.tx_bytes += cf->can_dlc;
+ sl->dev->stats.tx_bytes += cf->len;
}
/* Write out any remaining transmit buffer. Scheduled when tty is writable */
static void slcan_transmit(struct work_struct *work)
{
diff --git a/drivers/net/can/softing/softing_fw.c b/drivers/net/can/softing/softing_fw.c
index ccd649a8e37b..7e1536877993 100644
--- a/drivers/net/can/softing/softing_fw.c
+++ b/drivers/net/can/softing/softing_fw.c
@@ -622,11 +622,11 @@ int softing_startstop(struct net_device *dev, int up)
* from here, no errors should occur, or the failed: part
* must be reviewed
*/
memset(&msg, 0, sizeof(msg));
msg.can_id = CAN_ERR_FLAG | CAN_ERR_RESTARTED;
- msg.can_dlc = CAN_ERR_DLC;
+ msg.len = CAN_ERR_DLC;
for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
if (!(bus_bitmask_start & (1 << j)))
continue;
netdev = card->net[j];
if (!netdev)
diff --git a/drivers/net/can/softing/softing_main.c b/drivers/net/can/softing/softing_main.c
index 5cc175fd7067..42acfd5149e5 100644
--- a/drivers/net/can/softing/softing_main.c
+++ b/drivers/net/can/softing/softing_main.c
@@ -82,22 +82,22 @@ static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb,
if (cf->can_id & CAN_EFF_FLAG)
*ptr |= CMD_XTD;
if (priv->index)
*ptr |= CMD_BUS2;
++ptr;
- *ptr++ = cf->can_dlc;
+ *ptr++ = cf->len;
*ptr++ = (cf->can_id >> 0);
*ptr++ = (cf->can_id >> 8);
if (cf->can_id & CAN_EFF_FLAG) {
*ptr++ = (cf->can_id >> 16);
*ptr++ = (cf->can_id >> 24);
} else {
/* increment 1, not 2 as you might think */
ptr += 1;
}
if (!(cf->can_id & CAN_RTR_FLAG))
- memcpy(ptr, &cf->data[0], cf->can_dlc);
+ memcpy(ptr, &cf->data[0], cf->len);
memcpy_toio(&card->dpram[DPRAM_TX + DPRAM_TX_SIZE * fifo_wr],
buf, DPRAM_TX_SIZE);
if (++fifo_wr >= DPRAM_TX_CNT)
fifo_wr = 0;
iowrite8(fifo_wr, &card->dpram[DPRAM_TX_WR]);
@@ -165,11 +165,11 @@ static int softing_handle_1(struct softing *card)
int j;
/* reset condition */
iowrite8(0, &card->dpram[DPRAM_RX_LOST]);
/* prepare msg */
msg.can_id = CAN_ERR_FLAG | CAN_ERR_CRTL;
- msg.can_dlc = CAN_ERR_DLC;
+ msg.len = CAN_ERR_DLC;
msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
/*
* service to all buses, we don't know which it was applicable
* but only service buses that are online
*/
@@ -216,11 +216,11 @@ static int softing_handle_1(struct softing *card)
uint8_t can_state, state;
state = *ptr++;
msg.can_id = CAN_ERR_FLAG;
- msg.can_dlc = CAN_ERR_DLC;
+ msg.len = CAN_ERR_DLC;
if (state & SF_MASK_BUSOFF) {
can_state = CAN_STATE_BUS_OFF;
msg.can_id |= CAN_ERR_BUSOFF;
state = STATE_BUSOFF;
@@ -259,11 +259,11 @@ static int softing_handle_1(struct softing *card)
}
} else {
if (cmd & CMD_RTR)
msg.can_id |= CAN_RTR_FLAG;
- msg.can_dlc = can_get_cc_len(*ptr++);
+ msg.len = can_get_cc_len(*ptr++);
if (cmd & CMD_XTD) {
msg.can_id |= CAN_EFF_FLAG;
msg.can_id |= le32_to_cpup((void *)ptr);
ptr += 4;
} else {
@@ -292,19 +292,19 @@ static int softing_handle_1(struct softing *card)
--priv->tx.pending;
if (card->tx.pending)
--card->tx.pending;
++netdev->stats.tx_packets;
if (!(msg.can_id & CAN_RTR_FLAG))
- netdev->stats.tx_bytes += msg.can_dlc;
+ netdev->stats.tx_bytes += msg.len;
} else {
int ret;
ret = softing_netdev_rx(netdev, &msg, ktime);
if (ret == NET_RX_SUCCESS) {
++netdev->stats.rx_packets;
if (!(msg.can_id & CAN_RTR_FLAG))
- netdev->stats.rx_bytes += msg.can_dlc;
+ netdev->stats.rx_bytes += msg.len;
} else {
++netdev->stats.rx_dropped;
}
}
}
diff --git a/drivers/net/can/spi/hi311x.c b/drivers/net/can/spi/hi311x.c
index b182951dba52..00d09244013b 100644
--- a/drivers/net/can/spi/hi311x.c
+++ b/drivers/net/can/spi/hi311x.c
@@ -275,31 +275,31 @@ static void hi3110_hw_tx(struct spi_device *spi, struct can_frame *frame)
(frame->can_id & CAN_EFF_MASK) >> 7;
buf[HI3110_FIFO_ID_OFF + 3] =
((frame->can_id & CAN_EFF_MASK) << 1) |
((frame->can_id & CAN_RTR_FLAG) ? 1 : 0);
- buf[HI3110_FIFO_EXT_DLC_OFF] = frame->can_dlc;
+ buf[HI3110_FIFO_EXT_DLC_OFF] = frame->len;
memcpy(buf + HI3110_FIFO_EXT_DATA_OFF,
- frame->data, frame->can_dlc);
+ frame->data, frame->len);
hi3110_hw_tx_frame(spi, buf, HI3110_TX_EXT_BUF_LEN -
- (HI3110_CAN_MAX_DATA_LEN - frame->can_dlc));
+ (HI3110_CAN_MAX_DATA_LEN - frame->len));
} else {
/* Standard frame */
buf[HI3110_FIFO_ID_OFF] = (frame->can_id & CAN_SFF_MASK) >> 3;
buf[HI3110_FIFO_ID_OFF + 1] =
((frame->can_id & CAN_SFF_MASK) << 5) |
((frame->can_id & CAN_RTR_FLAG) ? (1 << 4) : 0);
- buf[HI3110_FIFO_STD_DLC_OFF] = frame->can_dlc;
+ buf[HI3110_FIFO_STD_DLC_OFF] = frame->len;
memcpy(buf + HI3110_FIFO_STD_DATA_OFF,
- frame->data, frame->can_dlc);
+ frame->data, frame->len);
hi3110_hw_tx_frame(spi, buf, HI3110_TX_STD_BUF_LEN -
- (HI3110_CAN_MAX_DATA_LEN - frame->can_dlc));
+ (HI3110_CAN_MAX_DATA_LEN - frame->len));
}
}
static void hi3110_hw_rx_frame(struct spi_device *spi, u8 *buf)
{
@@ -339,20 +339,20 @@ static void hi3110_hw_rx(struct spi_device *spi)
(buf[HI3110_FIFO_WOTIME_ID_OFF] << 3) |
((buf[HI3110_FIFO_WOTIME_ID_OFF + 1] & 0xE0) >> 5);
}
/* Data length */
- frame->can_dlc = can_get_cc_len(buf[HI3110_FIFO_WOTIME_DLC_OFF] & 0x0F);
+ frame->len = can_get_cc_len(buf[HI3110_FIFO_WOTIME_DLC_OFF] & 0x0F);
if (buf[HI3110_FIFO_WOTIME_ID_OFF + 3] & HI3110_FIFO_WOTIME_ID_RTR)
frame->can_id |= CAN_RTR_FLAG;
else
memcpy(frame->data, buf + HI3110_FIFO_WOTIME_DAT_OFF,
- frame->can_dlc);
+ frame->len);
priv->net->stats.rx_packets++;
- priv->net->stats.rx_bytes += frame->can_dlc;
+ priv->net->stats.rx_bytes += frame->len;
can_led_event(priv->net, CAN_LED_EVENT_RX);
netif_rx_ni(skb);
}
@@ -583,11 +583,11 @@ static void hi3110_tx_work_handler(struct work_struct *ws)
if (priv->can.state == CAN_STATE_BUS_OFF) {
hi3110_clean(net);
} else {
frame = (struct can_frame *)priv->tx_skb->data;
hi3110_hw_tx(spi, frame);
- priv->tx_len = 1 + frame->can_dlc;
+ priv->tx_len = 1 + frame->len;
can_put_echo_skb(priv->tx_skb, net, 0);
priv->tx_skb = NULL;
}
}
mutex_unlock(&priv->hi3110_lock);
diff --git a/drivers/net/can/spi/mcp251x.c b/drivers/net/can/spi/mcp251x.c
index 5764f88f2347..4b2fb956d779 100644
--- a/drivers/net/can/spi/mcp251x.c
+++ b/drivers/net/can/spi/mcp251x.c
@@ -642,13 +642,13 @@ static void mcp251x_hw_tx(struct spi_device *spi, struct can_frame *frame,
buf[TXBSIDL_OFF] = ((sid & SIDL_SID_MASK) << SIDL_SID_SHIFT) |
(exide << SIDL_EXIDE_SHIFT) |
((eid >> SIDL_EID_SHIFT) & SIDL_EID_MASK);
buf[TXBEID8_OFF] = GET_BYTE(eid, 1);
buf[TXBEID0_OFF] = GET_BYTE(eid, 0);
- buf[TXBDLC_OFF] = (rtr << DLC_RTR_SHIFT) | frame->can_dlc;
- memcpy(buf + TXBDAT_OFF, frame->data, frame->can_dlc);
- mcp251x_hw_tx_frame(spi, buf, frame->can_dlc, tx_buf_idx);
+ buf[TXBDLC_OFF] = (rtr << DLC_RTR_SHIFT) | frame->len;
+ memcpy(buf + TXBDAT_OFF, frame->data, frame->len);
+ mcp251x_hw_tx_frame(spi, buf, frame->len, tx_buf_idx);
/* use INSTRUCTION_RTS, to avoid "repeated frame problem" */
priv->spi_tx_buf[0] = INSTRUCTION_RTS(1 << tx_buf_idx);
mcp251x_spi_trans(priv->spi, 1);
}
@@ -718,15 +718,15 @@ static void mcp251x_hw_rx(struct spi_device *spi, int buf_idx)
(buf[RXBSIDL_OFF] >> RXBSIDL_SHIFT);
if (buf[RXBSIDL_OFF] & RXBSIDL_SRR)
frame->can_id |= CAN_RTR_FLAG;
}
/* Data length */
- frame->can_dlc = can_get_cc_len(buf[RXBDLC_OFF] & RXBDLC_LEN_MASK);
- memcpy(frame->data, buf + RXBDAT_OFF, frame->can_dlc);
+ frame->len = can_get_cc_len(buf[RXBDLC_OFF] & RXBDLC_LEN_MASK);
+ memcpy(frame->data, buf + RXBDAT_OFF, frame->len);
priv->net->stats.rx_packets++;
- priv->net->stats.rx_bytes += frame->can_dlc;
+ priv->net->stats.rx_bytes += frame->len;
can_led_event(priv->net, CAN_LED_EVENT_RX);
netif_rx_ni(skb);
}
@@ -996,14 +996,14 @@ static void mcp251x_tx_work_handler(struct work_struct *ws)
if (priv->can.state == CAN_STATE_BUS_OFF) {
mcp251x_clean(net);
} else {
frame = (struct can_frame *)priv->tx_skb->data;
- if (frame->can_dlc > CAN_FRAME_MAX_DATA_LEN)
- frame->can_dlc = CAN_FRAME_MAX_DATA_LEN;
+ if (frame->len > CAN_FRAME_MAX_DATA_LEN)
+ frame->len = CAN_FRAME_MAX_DATA_LEN;
mcp251x_hw_tx(spi, frame, 0);
- priv->tx_len = 1 + frame->can_dlc;
+ priv->tx_len = 1 + frame->len;
can_put_echo_skb(priv->tx_skb, net, 0);
priv->tx_skb = NULL;
}
}
mutex_unlock(&priv->mcp_lock);
diff --git a/drivers/net/can/sun4i_can.c b/drivers/net/can/sun4i_can.c
index 28cc9e0f3982..51d6338843fb 100644
--- a/drivers/net/can/sun4i_can.c
+++ b/drivers/net/can/sun4i_can.c
@@ -422,11 +422,11 @@ static netdev_tx_t sun4ican_start_xmit(struct sk_buff *skb, struct net_device *d
return NETDEV_TX_OK;
netif_stop_queue(dev);
id = cf->can_id;
- dlc = cf->can_dlc;
+ dlc = cf->len;
msg_flag_n = dlc;
if (id & CAN_RTR_FLAG)
msg_flag_n |= SUN4I_MSG_RTR_FLAG;
@@ -473,11 +473,11 @@ static void sun4i_can_rx(struct net_device *dev)
skb = alloc_can_skb(dev, &cf);
if (!skb)
return;
fi = readl(priv->base + SUN4I_REG_BUF0_ADDR);
- cf->can_dlc = can_get_cc_len(fi & 0x0F);
+ cf->len = can_get_cc_len(fi & 0x0F);
if (fi & SUN4I_MSG_EFF_FLAG) {
dreg = SUN4I_REG_BUF5_ADDR;
id = (readl(priv->base + SUN4I_REG_BUF1_ADDR) << 21) |
(readl(priv->base + SUN4I_REG_BUF2_ADDR) << 13) |
(readl(priv->base + SUN4I_REG_BUF3_ADDR) << 5) |
@@ -491,19 +491,19 @@ static void sun4i_can_rx(struct net_device *dev)
/* remote frame ? */
if (fi & SUN4I_MSG_RTR_FLAG)
id |= CAN_RTR_FLAG;
else
- for (i = 0; i < cf->can_dlc; i++)
+ for (i = 0; i < cf->len; i++)
cf->data[i] = readl(priv->base + dreg + i * 4);
cf->can_id = id;
sun4i_can_write_cmdreg(priv, SUN4I_CMD_RELEASE_RBUF);
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
can_led_event(dev, CAN_LED_EVENT_RX);
}
@@ -623,11 +623,11 @@ static int sun4i_can_err(struct net_device *dev, u8 isrc, u8 status)
can_bus_off(dev);
}
if (likely(skb)) {
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
} else {
return -ENOMEM;
}
diff --git a/drivers/net/can/ti_hecc.c b/drivers/net/can/ti_hecc.c
index 02e4260fd8f2..4a071ecdce4c 100644
--- a/drivers/net/can/ti_hecc.c
+++ b/drivers/net/can/ti_hecc.c
@@ -494,11 +494,11 @@ static netdev_tx_t ti_hecc_xmit(struct sk_buff *skb, struct net_device *ndev)
return NETDEV_TX_BUSY;
}
spin_unlock_irqrestore(&priv->mbx_lock, flags);
/* Prepare mailbox for transmission */
- data = cf->can_dlc | (get_tx_head_prio(priv) << 8);
+ data = cf->len | (get_tx_head_prio(priv) << 8);
if (cf->can_id & CAN_RTR_FLAG) /* Remote transmission request */
data |= HECC_CANMCF_RTR;
hecc_write_mbx(priv, mbxno, HECC_CANMCF, data);
if (cf->can_id & CAN_EFF_FLAG) /* Extended frame format */
@@ -506,11 +506,11 @@ static netdev_tx_t ti_hecc_xmit(struct sk_buff *skb, struct net_device *ndev)
else /* Standard frame format */
data = (cf->can_id & CAN_SFF_MASK) << 18;
hecc_write_mbx(priv, mbxno, HECC_CANMID, data);
hecc_write_mbx(priv, mbxno, HECC_CANMDL,
be32_to_cpu(*(__be32 *)(cf->data)));
- if (cf->can_dlc > 4)
+ if (cf->len > 4)
hecc_write_mbx(priv, mbxno, HECC_CANMDH,
be32_to_cpu(*(__be32 *)(cf->data + 4)));
else
*(u32 *)(cf->data + 4) = 0;
can_put_echo_skb(skb, ndev, mbxno);
@@ -564,15 +564,15 @@ static struct sk_buff *ti_hecc_mailbox_read(struct can_rx_offload *offload,
cf->can_id = (data >> 18) & CAN_SFF_MASK;
data = hecc_read_mbx(priv, mbxno, HECC_CANMCF);
if (data & HECC_CANMCF_RTR)
cf->can_id |= CAN_RTR_FLAG;
- cf->can_dlc = can_get_cc_len(data & 0xF);
+ cf->len = can_get_cc_len(data & 0xF);
data = hecc_read_mbx(priv, mbxno, HECC_CANMDL);
*(__be32 *)(cf->data) = cpu_to_be32(data);
- if (cf->can_dlc > 4) {
+ if (cf->len > 4) {
data = hecc_read_mbx(priv, mbxno, HECC_CANMDH);
*(__be32 *)(cf->data + 4) = cpu_to_be32(data);
}
*timestamp = hecc_read_stamp(priv, mbxno);
diff --git a/drivers/net/can/usb/ems_usb.c b/drivers/net/can/usb/ems_usb.c
index 0ccf8c0f7db5..9be6f18939a5 100644
--- a/drivers/net/can/usb/ems_usb.c
+++ b/drivers/net/can/usb/ems_usb.c
@@ -304,26 +304,26 @@ static void ems_usb_rx_can_msg(struct ems_usb *dev, struct ems_cpc_msg *msg)
skb = alloc_can_skb(dev->netdev, &cf);
if (skb == NULL)
return;
cf->can_id = le32_to_cpu(msg->msg.can_msg.id);
- cf->can_dlc = can_get_cc_len(msg->msg.can_msg.length & 0xF);
+ cf->len = can_get_cc_len(msg->msg.can_msg.length & 0xF);
if (msg->type == CPC_MSG_TYPE_EXT_CAN_FRAME ||
msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME)
cf->can_id |= CAN_EFF_FLAG;
if (msg->type == CPC_MSG_TYPE_RTR_FRAME ||
msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME) {
cf->can_id |= CAN_RTR_FLAG;
} else {
- for (i = 0; i < cf->can_dlc; i++)
+ for (i = 0; i < cf->len; i++)
cf->data[i] = msg->msg.can_msg.msg[i];
}
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
}
static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg)
{
@@ -394,11 +394,11 @@ static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg)
stats->rx_over_errors++;
stats->rx_errors++;
}
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
}
/*
* callback for bulk IN urb
@@ -753,25 +753,25 @@ static netdev_tx_t ems_usb_start_xmit(struct sk_buff *skb, struct net_device *ne
}
msg = (struct ems_cpc_msg *)&buf[CPC_HEADER_SIZE];
msg->msg.can_msg.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
- msg->msg.can_msg.length = cf->can_dlc;
+ msg->msg.can_msg.length = cf->len;
if (cf->can_id & CAN_RTR_FLAG) {
msg->type = cf->can_id & CAN_EFF_FLAG ?
CPC_CMD_TYPE_EXT_RTR_FRAME : CPC_CMD_TYPE_RTR_FRAME;
msg->length = CPC_CAN_MSG_MIN_SIZE;
} else {
msg->type = cf->can_id & CAN_EFF_FLAG ?
CPC_CMD_TYPE_EXT_CAN_FRAME : CPC_CMD_TYPE_CAN_FRAME;
- for (i = 0; i < cf->can_dlc; i++)
+ for (i = 0; i < cf->len; i++)
msg->msg.can_msg.msg[i] = cf->data[i];
- msg->length = CPC_CAN_MSG_MIN_SIZE + cf->can_dlc;
+ msg->length = CPC_CAN_MSG_MIN_SIZE + cf->len;
}
for (i = 0; i < MAX_TX_URBS; i++) {
if (dev->tx_contexts[i].echo_index == MAX_TX_URBS) {
context = &dev->tx_contexts[i];
@@ -792,11 +792,11 @@ static netdev_tx_t ems_usb_start_xmit(struct sk_buff *skb, struct net_device *ne
return NETDEV_TX_BUSY;
}
context->dev = dev;
context->echo_index = i;
- context->dlc = cf->can_dlc;
+ context->dlc = cf->len;
usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
size, ems_usb_write_bulk_callback, context);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
usb_anchor_urb(urb, &dev->tx_submitted);
diff --git a/drivers/net/can/usb/esd_usb2.c b/drivers/net/can/usb/esd_usb2.c
index 8752bda36b46..50cf5e88c9c3 100644
--- a/drivers/net/can/usb/esd_usb2.c
+++ b/drivers/net/can/usb/esd_usb2.c
@@ -290,11 +290,11 @@ static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv,
priv->bec.txerr = txerr;
priv->bec.rxerr = rxerr;
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
}
}
static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv,
@@ -319,24 +319,24 @@ static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv,
stats->rx_dropped++;
return;
}
cf->can_id = id & ESD_IDMASK;
- cf->can_dlc = can_get_cc_len(msg->msg.rx.dlc & ~ESD_RTR);
+ cf->len = can_get_cc_len(msg->msg.rx.dlc & ~ESD_RTR);
if (id & ESD_EXTID)
cf->can_id |= CAN_EFF_FLAG;
if (msg->msg.rx.dlc & ESD_RTR) {
cf->can_id |= CAN_RTR_FLAG;
} else {
- for (i = 0; i < cf->can_dlc; i++)
+ for (i = 0; i < cf->len; i++)
cf->data[i] = msg->msg.rx.data[i];
}
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
}
return;
}
@@ -735,23 +735,23 @@ static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb,
msg = (struct esd_usb2_msg *)buf;
msg->msg.hdr.len = 3; /* minimal length */
msg->msg.hdr.cmd = CMD_CAN_TX;
msg->msg.tx.net = priv->index;
- msg->msg.tx.dlc = cf->can_dlc;
+ msg->msg.tx.dlc = cf->len;
msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
if (cf->can_id & CAN_RTR_FLAG)
msg->msg.tx.dlc |= ESD_RTR;
if (cf->can_id & CAN_EFF_FLAG)
msg->msg.tx.id |= cpu_to_le32(ESD_EXTID);
- for (i = 0; i < cf->can_dlc; i++)
+ for (i = 0; i < cf->len; i++)
msg->msg.tx.data[i] = cf->data[i];
- msg->msg.hdr.len += (cf->can_dlc + 3) >> 2;
+ msg->msg.hdr.len += (cf->len + 3) >> 2;
for (i = 0; i < MAX_TX_URBS; i++) {
if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
context = &priv->tx_contexts[i];
break;
@@ -767,11 +767,11 @@ static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb,
goto releasebuf;
}
context->priv = priv;
context->echo_index = i;
- context->dlc = cf->can_dlc;
+ context->dlc = cf->len;
/* hnd must not be 0 - MSB is stripped in txdone handling */
msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */
usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index 07fe84968391..3a097c240e5a 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -133,11 +133,11 @@ struct gs_device_bt_const {
struct gs_host_frame {
u32 echo_id;
u32 can_id;
- u8 can_dlc;
+ u8 len;
u8 channel;
u8 flags;
u8 reserved;
u8 data[8];
@@ -329,19 +329,19 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
if (!skb)
return;
cf->can_id = hf->can_id;
- cf->can_dlc = can_get_cc_len(hf->can_dlc);
+ cf->len = can_get_cc_len(hf->len);
memcpy(cf->data, hf->data, 8);
/* ERROR frames tell us information about the controller */
if (hf->can_id & CAN_ERR_FLAG)
gs_update_state(dev, cf);
netdev->stats.rx_packets++;
- netdev->stats.rx_bytes += hf->can_dlc;
+ netdev->stats.rx_bytes += hf->len;
netif_rx(skb);
} else { /* echo_id == hf->echo_id */
if (hf->echo_id >= GS_MAX_TX_URBS) {
netdev_err(netdev,
@@ -349,11 +349,11 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
hf->echo_id);
goto resubmit_urb;
}
netdev->stats.tx_packets++;
- netdev->stats.tx_bytes += hf->can_dlc;
+ netdev->stats.tx_bytes += hf->len;
txc = gs_get_tx_context(dev, hf->echo_id);
/* bad devices send bad echo_ids. */
if (!txc) {
@@ -376,11 +376,11 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
skb = alloc_can_err_skb(netdev, &cf);
if (!skb)
goto resubmit_urb;
cf->can_id |= CAN_ERR_CRTL;
- cf->can_dlc = CAN_ERR_DLC;
+ cf->len = CAN_ERR_DLC;
cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
stats->rx_over_errors++;
stats->rx_errors++;
netif_rx(skb);
}
@@ -502,12 +502,12 @@ static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
hf->channel = dev->channel;
cf = (struct can_frame *)skb->data;
hf->can_id = cf->can_id;
- hf->can_dlc = cf->can_dlc;
- memcpy(hf->data, cf->data, cf->can_dlc);
+ hf->len = cf->len;
+ memcpy(hf->data, cf->data, cf->len);
usb_fill_bulk_urb(urb, dev->udev,
usb_sndbulkpipe(dev->udev, GSUSB_ENDPOINT_OUT),
hf,
sizeof(*hf),
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
index 0f1d3e807d63..d6e18bcb1a7f 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
@@ -256,11 +256,11 @@ int kvaser_usb_can_rx_over_error(struct net_device *netdev)
cf->can_id |= CAN_ERR_CRTL;
cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
return 0;
}
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
index b2d56bb1950a..a9a1f7f5a50e 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
@@ -893,11 +893,11 @@ static void kvaser_usb_hydra_update_state(struct kvaser_usb_net_priv *priv,
cf->data[6] = bec->txerr;
cf->data[7] = bec->rxerr;
stats = &netdev->stats;
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
}
static void kvaser_usb_hydra_state_event(const struct kvaser_usb *dev,
const struct kvaser_cmd *cmd)
@@ -1047,11 +1047,11 @@ kvaser_usb_hydra_error_frame(struct kvaser_usb_net_priv *priv,
cf->can_id |= CAN_ERR_BUSERROR;
cf->data[6] = bec.txerr;
cf->data[7] = bec.rxerr;
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
priv->bec.txerr = bec.txerr;
priv->bec.rxerr = bec.rxerr;
}
@@ -1082,11 +1082,11 @@ static void kvaser_usb_hydra_one_shot_fail(struct kvaser_usb_net_priv *priv,
priv->can.can_stats.arbitration_lost++;
}
stats->tx_errors++;
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
}
static void kvaser_usb_hydra_tx_acknowledge(const struct kvaser_usb *dev,
const struct kvaser_cmd *cmd)
@@ -1178,19 +1178,19 @@ static void kvaser_usb_hydra_rx_msg_std(const struct kvaser_usb *dev,
}
if (flags & KVASER_USB_HYDRA_CF_FLAG_OVERRUN)
kvaser_usb_can_rx_over_error(priv->netdev);
- cf->can_dlc = can_get_cc_len(cmd->rx_can.dlc);
+ cf->len = can_get_cc_len(cmd->rx_can.dlc);
if (flags & KVASER_USB_HYDRA_CF_FLAG_REMOTE_FRAME)
cf->can_id |= CAN_RTR_FLAG;
else
- memcpy(cf->data, cmd->rx_can.data, cf->can_dlc);
+ memcpy(cf->data, cmd->rx_can.data, cf->len);
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
}
static void kvaser_usb_hydra_rx_msg_ext(const struct kvaser_usb *dev,
const struct kvaser_cmd_ext *cmd)
@@ -1432,11 +1432,11 @@ kvaser_usb_hydra_frame_to_cmd_std(const struct kvaser_usb_net_priv *priv,
struct kvaser_cmd *cmd;
struct can_frame *cf = (struct can_frame *)skb->data;
u32 flags;
u32 id;
- *frame_len = cf->can_dlc;
+ *frame_len = cf->len;
cmd = kcalloc(1, sizeof(struct kvaser_cmd), GFP_ATOMIC);
if (!cmd)
return NULL;
@@ -1453,11 +1453,11 @@ kvaser_usb_hydra_frame_to_cmd_std(const struct kvaser_usb_net_priv *priv,
id |= KVASER_USB_HYDRA_EXTENDED_FRAME_ID;
} else {
id = cf->can_id & CAN_SFF_MASK;
}
- cmd->tx_can.dlc = cf->can_dlc;
+ cmd->tx_can.dlc = cf->len;
flags = (cf->can_id & CAN_EFF_FLAG ?
KVASER_USB_HYDRA_CF_FLAG_EXTENDED_ID : 0);
if (cf->can_id & CAN_RTR_FLAG)
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
index dcc5aa022e8f..493a33bbe2df 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
@@ -348,11 +348,11 @@ kvaser_usb_leaf_frame_to_cmd(const struct kvaser_usb_net_priv *priv,
struct kvaser_usb *dev = priv->dev;
struct kvaser_cmd *cmd;
u8 *cmd_tx_can_flags = NULL; /* GCC */
struct can_frame *cf = (struct can_frame *)skb->data;
- *frame_len = cf->can_dlc;
+ *frame_len = cf->len;
cmd = kmalloc(sizeof(*cmd), GFP_ATOMIC);
if (cmd) {
cmd->u.tx_can.tid = transid & 0xff;
cmd->len = *cmd_len = CMD_HEADER_LEN +
@@ -381,12 +381,12 @@ kvaser_usb_leaf_frame_to_cmd(const struct kvaser_usb_net_priv *priv,
cmd->id = CMD_TX_STD_MESSAGE;
cmd->u.tx_can.data[0] = (cf->can_id >> 6) & 0x1f;
cmd->u.tx_can.data[1] = cf->can_id & 0x3f;
}
- cmd->u.tx_can.data[5] = cf->can_dlc;
- memcpy(&cmd->u.tx_can.data[6], cf->data, cf->can_dlc);
+ cmd->u.tx_can.data[5] = cf->len;
+ memcpy(&cmd->u.tx_can.data[6], cf->data, cf->len);
if (cf->can_id & CAN_RTR_FLAG)
*cmd_tx_can_flags |= MSG_FLAG_REMOTE_FRAME;
}
return cmd;
@@ -574,11 +574,11 @@ static void kvaser_usb_leaf_tx_acknowledge(const struct kvaser_usb *dev,
skb = alloc_can_err_skb(priv->netdev, &cf);
if (skb) {
cf->can_id |= CAN_ERR_RESTARTED;
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
} else {
netdev_err(priv->netdev,
"No memory left for err_skb\n");
}
@@ -692,11 +692,11 @@ kvaser_usb_leaf_rx_error_update_can_state(struct kvaser_usb_net_priv *priv,
static void kvaser_usb_leaf_rx_error(const struct kvaser_usb *dev,
const struct kvaser_usb_err_summary *es)
{
struct can_frame *cf;
struct can_frame tmp_cf = { .can_id = CAN_ERR_FLAG,
- .can_dlc = CAN_ERR_DLC };
+ .len = CAN_ERR_DLC };
struct sk_buff *skb;
struct net_device_stats *stats;
struct kvaser_usb_net_priv *priv;
enum can_state old_state, new_state;
@@ -776,11 +776,11 @@ static void kvaser_usb_leaf_rx_error(const struct kvaser_usb *dev,
cf->data[6] = es->txerr;
cf->data[7] = es->rxerr;
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
}
/* For USBCAN, report error to userspace if the channels's errors counter
* has changed, or we're the only channel seeing a bus error state.
@@ -976,17 +976,17 @@ static void kvaser_usb_leaf_rx_can_msg(const struct kvaser_usb *dev,
if (cf->can_id & KVASER_EXTENDED_FRAME)
cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
else
cf->can_id &= CAN_SFF_MASK;
- cf->can_dlc = can_get_cc_len(cmd->u.leaf.log_message.dlc);
+ cf->len = can_get_cc_len(cmd->u.leaf.log_message.dlc);
if (cmd->u.leaf.log_message.flags & MSG_FLAG_REMOTE_FRAME)
cf->can_id |= CAN_RTR_FLAG;
else
memcpy(cf->data, &cmd->u.leaf.log_message.data,
- cf->can_dlc);
+ cf->len);
} else {
cf->can_id = ((rx_data[0] & 0x1f) << 6) | (rx_data[1] & 0x3f);
if (cmd->id == CMD_RX_EXT_MESSAGE) {
cf->can_id <<= 18;
@@ -994,20 +994,20 @@ static void kvaser_usb_leaf_rx_can_msg(const struct kvaser_usb *dev,
((rx_data[3] & 0xff) << 6) |
(rx_data[4] & 0x3f);
cf->can_id |= CAN_EFF_FLAG;
}
- cf->can_dlc = can_get_cc_len(rx_data[5]);
+ cf->len = can_get_cc_len(rx_data[5]);
if (cmd->u.rx_can_header.flag & MSG_FLAG_REMOTE_FRAME)
cf->can_id |= CAN_RTR_FLAG;
else
- memcpy(cf->data, &rx_data[6], cf->can_dlc);
+ memcpy(cf->data, &rx_data[6], cf->len);
}
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
}
static void kvaser_usb_leaf_start_chip_reply(const struct kvaser_usb *dev,
const struct kvaser_cmd *cmd)
diff --git a/drivers/net/can/usb/mcba_usb.c b/drivers/net/can/usb/mcba_usb.c
index 14352718b004..3d5bd8b0fbd3 100644
--- a/drivers/net/can/usb/mcba_usb.c
+++ b/drivers/net/can/usb/mcba_usb.c
@@ -182,11 +182,11 @@ static inline struct mcba_usb_ctx *mcba_usb_get_free_ctx(struct mcba_priv *priv,
ctx = &priv->tx_context[i];
ctx->ndx = i;
if (cf) {
ctx->can = true;
- ctx->dlc = cf->can_dlc;
+ ctx->dlc = cf->len;
} else {
ctx->can = false;
ctx->dlc = 0;
}
@@ -348,11 +348,11 @@ static netdev_tx_t mcba_usb_start_xmit(struct sk_buff *skb,
put_unaligned_be16((cf->can_id & CAN_SFF_MASK) << 5,
&usb_msg.sid);
usb_msg.eid = 0;
}
- usb_msg.dlc = cf->can_dlc;
+ usb_msg.dlc = cf->len;
memcpy(usb_msg.data, cf->data, usb_msg.dlc);
if (cf->can_id & CAN_RTR_FLAG)
usb_msg.dlc |= MCBA_DLC_RTR_MASK;
@@ -449,16 +449,16 @@ static void mcba_usb_process_can(struct mcba_priv *priv,
}
if (msg->dlc & MCBA_DLC_RTR_MASK)
cf->can_id |= CAN_RTR_FLAG;
- cf->can_dlc = can_get_cc_len(msg->dlc & MCBA_DLC_MASK);
+ cf->len = can_get_cc_len(msg->dlc & MCBA_DLC_MASK);
- memcpy(cf->data, msg->data, cf->can_dlc);
+ memcpy(cf->data, msg->data, cf->len);
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
can_led_event(priv->netdev, CAN_LED_EVENT_RX);
netif_rx(skb);
}
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb.c b/drivers/net/can/usb/peak_usb/pcan_usb.c
index 5df74533ba4d..abecb77e34f2 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb.c
@@ -594,11 +594,11 @@ static int pcan_usb_decode_error(struct pcan_usb_msg_context *mc, u8 n,
peak_usb_get_ts_time(&mc->pdev->time_ref, mc->ts16,
&hwts->hwtstamp);
}
mc->netdev->stats.rx_packets++;
- mc->netdev->stats.rx_bytes += cf->can_dlc;
+ mc->netdev->stats.rx_bytes += cf->len;
netif_rx(skb);
return 0;
}
@@ -732,11 +732,11 @@ static int pcan_usb_decode_data(struct pcan_usb_msg_context *mc, u8 status_len)
mc->ptr += 2;
cf->can_id = le16_to_cpu(tmp16) >> 5;
}
- cf->can_dlc = can_get_cc_len(rec_len);
+ cf->len = can_get_cc_len(rec_len);
/* Only first packet timestamp is a word */
if (pcan_usb_decode_ts(mc, !mc->rec_ts_idx))
goto decode_failed;
@@ -749,21 +749,21 @@ static int pcan_usb_decode_data(struct pcan_usb_msg_context *mc, u8 status_len)
cf->can_id |= CAN_RTR_FLAG;
} else {
if ((mc->ptr + rec_len) > mc->end)
goto decode_failed;
- memcpy(cf->data, mc->ptr, cf->can_dlc);
+ memcpy(cf->data, mc->ptr, cf->len);
mc->ptr += rec_len;
}
/* convert timestamp into kernel time */
hwts = skb_hwtstamps(skb);
peak_usb_get_ts_time(&mc->pdev->time_ref, mc->ts16, &hwts->hwtstamp);
/* update statistics */
mc->netdev->stats.rx_packets++;
- mc->netdev->stats.rx_bytes += cf->can_dlc;
+ mc->netdev->stats.rx_bytes += cf->len;
/* push the skb */
netif_rx(skb);
return 0;
@@ -836,11 +836,11 @@ static int pcan_usb_encode_msg(struct peak_usb_device *dev, struct sk_buff *skb,
obuf[1] = 1;
pc = obuf + PCAN_USB_MSG_HEADER_LEN;
/* status/len byte */
- *pc = cf->can_dlc;
+ *pc = cf->len;
if (cf->can_id & CAN_RTR_FLAG)
*pc |= PCAN_USB_STATUSLEN_RTR;
/* can id */
if (cf->can_id & CAN_EFF_FLAG) {
@@ -856,12 +856,12 @@ static int pcan_usb_encode_msg(struct peak_usb_device *dev, struct sk_buff *skb,
pc += 2;
}
/* can data */
if (!(cf->can_id & CAN_RTR_FLAG)) {
- memcpy(pc, cf->data, cf->can_dlc);
- pc += cf->can_dlc;
+ memcpy(pc, cf->data, cf->len);
+ pc += cf->len;
}
obuf[(*size)-1] = (u8)(stats->tx_packets & 0xff);
return 0;
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
index 57dfa443c995..3e875cdbadac 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
@@ -579,11 +579,11 @@ static int pcan_usb_fd_decode_status(struct pcan_usb_fd_if *usb_if,
return -ENOMEM;
peak_usb_netif_rx(skb, &usb_if->time_ref, le32_to_cpu(sm->ts_low));
netdev->stats.rx_packets++;
- netdev->stats.rx_bytes += cf->can_dlc;
+ netdev->stats.rx_bytes += cf->len;
return 0;
}
/* handle uCAN error message */
@@ -735,11 +735,11 @@ static int pcan_usb_fd_encode_msg(struct peak_usb_device *dev,
struct sk_buff *skb, u8 *obuf, size_t *size)
{
struct pucan_tx_msg *tx_msg = (struct pucan_tx_msg *)obuf;
struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
u16 tx_msg_size, tx_msg_flags;
- u8 can_dlc;
+ u8 len;
if (cfd->len > CANFD_MAX_DLEN)
return -EINVAL;
tx_msg_size = ALIGN(sizeof(struct pucan_tx_msg) + cfd->len, 4);
@@ -754,29 +754,29 @@ static int pcan_usb_fd_encode_msg(struct peak_usb_device *dev,
tx_msg->can_id = cpu_to_le32(cfd->can_id & CAN_SFF_MASK);
}
if (can_is_canfd_skb(skb)) {
/* considering a CANFD frame */
- can_dlc = can_len2dlc(cfd->len);
+ len = can_len2dlc(cfd->len);
tx_msg_flags |= PUCAN_MSG_EXT_DATA_LEN;
if (cfd->flags & CANFD_BRS)
tx_msg_flags |= PUCAN_MSG_BITRATE_SWITCH;
if (cfd->flags & CANFD_ESI)
tx_msg_flags |= PUCAN_MSG_ERROR_STATE_IND;
} else {
/* CAND 2.0 frames */
- can_dlc = cfd->len;
+ len = cfd->len;
if (cfd->can_id & CAN_RTR_FLAG)
tx_msg_flags |= PUCAN_MSG_RTR;
}
tx_msg->flags = cpu_to_le16(tx_msg_flags);
- tx_msg->channel_dlc = PUCAN_MSG_CHANNEL_DLC(dev->ctrl_idx, can_dlc);
+ tx_msg->channel_dlc = PUCAN_MSG_CHANNEL_DLC(dev->ctrl_idx, len);
memcpy(tx_msg->d, cfd->data, cfd->len);
/* add null size message to tag the end (messages are 32-bits aligned)
*/
tx_msg = (struct pucan_tx_msg *)(obuf + tx_msg_size);
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
index c7564773fb2b..275087c39602 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
@@ -530,26 +530,26 @@ static int pcan_usb_pro_handle_canmsg(struct pcan_usb_pro_interface *usb_if,
skb = alloc_can_skb(netdev, &can_frame);
if (!skb)
return -ENOMEM;
can_frame->can_id = le32_to_cpu(rx->id);
- can_frame->can_dlc = rx->len & 0x0f;
+ can_frame->len = rx->len & 0x0f;
if (rx->flags & PCAN_USBPRO_EXT)
can_frame->can_id |= CAN_EFF_FLAG;
if (rx->flags & PCAN_USBPRO_RTR)
can_frame->can_id |= CAN_RTR_FLAG;
else
- memcpy(can_frame->data, rx->data, can_frame->can_dlc);
+ memcpy(can_frame->data, rx->data, can_frame->len);
hwts = skb_hwtstamps(skb);
peak_usb_get_ts_time(&usb_if->time_ref, le32_to_cpu(rx->ts32),
&hwts->hwtstamp);
netdev->stats.rx_packets++;
- netdev->stats.rx_bytes += can_frame->can_dlc;
+ netdev->stats.rx_bytes += can_frame->len;
netif_rx(skb);
return 0;
}
@@ -660,11 +660,11 @@ static int pcan_usb_pro_handle_error(struct pcan_usb_pro_interface *usb_if,
dev->can.state = new_state;
hwts = skb_hwtstamps(skb);
peak_usb_get_ts_time(&usb_if->time_ref, le32_to_cpu(er->ts32), &hwts->hwtstamp);
netdev->stats.rx_packets++;
- netdev->stats.rx_bytes += can_frame->can_dlc;
+ netdev->stats.rx_bytes += can_frame->len;
netif_rx(skb);
return 0;
}
@@ -765,18 +765,18 @@ static int pcan_usb_pro_encode_msg(struct peak_usb_device *dev,
u8 data_type, len, flags;
struct pcan_usb_pro_msg usb_msg;
pcan_msg_init_empty(&usb_msg, obuf, *size);
- if ((cf->can_id & CAN_RTR_FLAG) || (cf->can_dlc == 0))
+ if ((cf->can_id & CAN_RTR_FLAG) || (cf->len == 0))
data_type = PCAN_USBPRO_TXMSG0;
- else if (cf->can_dlc <= 4)
+ else if (cf->len <= 4)
data_type = PCAN_USBPRO_TXMSG4;
else
data_type = PCAN_USBPRO_TXMSG8;
- len = (dev->ctrl_idx << 4) | (cf->can_dlc & 0x0f);
+ len = (dev->ctrl_idx << 4) | (cf->len & 0x0f);
flags = 0;
if (cf->can_id & CAN_EFF_FLAG)
flags |= 0x02;
if (cf->can_id & CAN_RTR_FLAG)
diff --git a/drivers/net/can/usb/ucan.c b/drivers/net/can/usb/ucan.c
index ea11a3f0392b..ef8f449ce475 100644
--- a/drivers/net/can/usb/ucan.c
+++ b/drivers/net/can/usb/ucan.c
@@ -612,19 +612,19 @@ static void ucan_rx_can_msg(struct ucan_priv *up, struct ucan_message_in *m)
/* fill the can frame */
cf->can_id = canid;
/* compute DLC taking RTR_FLAG into account */
- cf->can_dlc = ucan_can_get_cc_len(&m->msg.can_msg, len);
+ cf->len = ucan_can_get_cc_len(&m->msg.can_msg, len);
/* copy the payload of non RTR frames */
if (!(cf->can_id & CAN_RTR_FLAG) || (cf->can_id & CAN_ERR_FLAG))
- memcpy(cf->data, m->msg.can_msg.data, cf->can_dlc);
+ memcpy(cf->data, m->msg.can_msg.data, cf->len);
/* don't count error frames as real packets */
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
/* pass it to Linux */
netif_rx(skb);
}
@@ -1076,19 +1076,19 @@ static struct urb *ucan_prepare_tx_urb(struct ucan_priv *up,
if (cf->can_id & CAN_RTR_FLAG) {
mlen = UCAN_OUT_HDR_SIZE +
offsetof(struct ucan_can_msg, dlc) +
sizeof(m->msg.can_msg.dlc);
- m->msg.can_msg.dlc = cf->can_dlc;
+ m->msg.can_msg.dlc = cf->len;
} else {
mlen = UCAN_OUT_HDR_SIZE +
- sizeof(m->msg.can_msg.id) + cf->can_dlc;
- memcpy(m->msg.can_msg.data, cf->data, cf->can_dlc);
+ sizeof(m->msg.can_msg.id) + cf->len;
+ memcpy(m->msg.can_msg.data, cf->data, cf->len);
}
m->len = cpu_to_le16(mlen);
- context->dlc = cf->can_dlc;
+ context->dlc = cf->len;
m->subtype = echo_index;
/* build the urb */
usb_fill_bulk_urb(urb, up->udev,
diff --git a/drivers/net/can/usb/usb_8dev.c b/drivers/net/can/usb/usb_8dev.c
index 9d1597ad7ba4..8aedb2ba37fb 100644
--- a/drivers/net/can/usb/usb_8dev.c
+++ b/drivers/net/can/usb/usb_8dev.c
@@ -447,11 +447,11 @@ static void usb_8dev_rx_err_msg(struct usb_8dev_priv *priv,
priv->bec.txerr = txerr;
priv->bec.rxerr = rxerr;
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
}
/* Read data and status frames */
static void usb_8dev_rx_can_msg(struct usb_8dev_priv *priv,
@@ -468,22 +468,22 @@ static void usb_8dev_rx_can_msg(struct usb_8dev_priv *priv,
skb = alloc_can_skb(priv->netdev, &cf);
if (!skb)
return;
cf->can_id = be32_to_cpu(msg->id);
- cf->can_dlc = can_get_cc_len(msg->dlc & 0xF);
+ cf->len = can_get_cc_len(msg->dlc & 0xF);
if (msg->flags & USB_8DEV_EXTID)
cf->can_id |= CAN_EFF_FLAG;
if (msg->flags & USB_8DEV_RTR)
cf->can_id |= CAN_RTR_FLAG;
else
- memcpy(cf->data, msg->data, cf->can_dlc);
+ memcpy(cf->data, msg->data, cf->len);
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
can_led_event(priv->netdev, CAN_LED_EVENT_RX);
} else {
netdev_warn(priv->netdev, "frame type %d unknown",
@@ -635,12 +635,12 @@ static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb,
if (cf->can_id & CAN_EFF_FLAG)
msg->flags |= USB_8DEV_EXTID;
msg->id = cpu_to_be32(cf->can_id & CAN_ERR_MASK);
- msg->dlc = cf->can_dlc;
- memcpy(msg->data, cf->data, cf->can_dlc);
+ msg->dlc = cf->len;
+ memcpy(msg->data, cf->data, cf->len);
msg->end = USB_8DEV_DATA_END;
for (i = 0; i < MAX_TX_URBS; i++) {
if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
context = &priv->tx_contexts[i];
@@ -654,11 +654,11 @@ static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb,
if (!context)
goto nofreecontext;
context->priv = priv;
context->echo_index = i;
- context->dlc = cf->can_dlc;
+ context->dlc = cf->len;
usb_fill_bulk_urb(urb, priv->udev,
usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_TX),
buf, size, usb_8dev_write_bulk_callback, context);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c
index 1740fbc371c4..f8445f6dbb3a 100644
--- a/drivers/net/can/xilinx_can.c
+++ b/drivers/net/can/xilinx_can.c
@@ -757,11 +757,11 @@ static int xcan_rx(struct net_device *ndev, int frame_base)
id_xcan = priv->read_reg(priv, XCAN_FRAME_ID_OFFSET(frame_base));
dlc = priv->read_reg(priv, XCAN_FRAME_DLC_OFFSET(frame_base)) >>
XCAN_DLCR_DLC_SHIFT;
/* Change Xilinx CAN data length format to socketCAN data format */
- cf->can_dlc = can_get_cc_len(dlc);
+ cf->len = can_get_cc_len(dlc);
/* Change Xilinx CAN ID format to socketCAN ID format */
if (id_xcan & XCAN_IDR_IDE_MASK) {
/* The received frame is an Extended format frame */
cf->can_id = (id_xcan & XCAN_IDR_ID1_MASK) >> 3;
@@ -782,17 +782,17 @@ static int xcan_rx(struct net_device *ndev, int frame_base)
data[0] = priv->read_reg(priv, XCAN_FRAME_DW1_OFFSET(frame_base));
data[1] = priv->read_reg(priv, XCAN_FRAME_DW2_OFFSET(frame_base));
if (!(cf->can_id & CAN_RTR_FLAG)) {
/* Change Xilinx CAN data format to socketCAN data format */
- if (cf->can_dlc > 0)
+ if (cf->len > 0)
*(__be32 *)(cf->data) = cpu_to_be32(data[0]);
- if (cf->can_dlc > 4)
+ if (cf->len > 4)
*(__be32 *)(cf->data + 4) = cpu_to_be32(data[1]);
}
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
stats->rx_packets++;
netif_receive_skb(skb);
return 1;
}
@@ -968,11 +968,11 @@ static void xcan_update_error_state_after_rxtx(struct net_device *ndev)
if (skb) {
struct net_device_stats *stats = &ndev->stats;
stats->rx_packets++;
- stats->rx_bytes += cf->can_dlc;
+ stats->rx_bytes += cf->len;
netif_rx(skb);
}
}
}
diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index b2e8df8e4cb0..72671184a7a2 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -183,12 +183,12 @@ static inline void can_set_static_ctrlmode(struct net_device *dev,
/* override MTU which was set by default in can_setup()? */
if (static_mode & CAN_CTRLMODE_FD)
dev->mtu = CANFD_MTU;
}
-/* get data length from can_dlc with sanitized can_dlc */
-u8 can_dlc2len(u8 can_dlc);
+/* get data length from raw data length code (DLC) */
+u8 can_dlc2len(u8 dlc);
/* map the sanitized data length to an appropriate data length code */
u8 can_len2dlc(u8 len);
struct net_device *alloc_candev_mqs(int sizeof_priv, unsigned int echo_skb_max,
diff --git a/net/can/af_can.c b/net/can/af_can.c
index 6373ab9c5507..fd558e4df8bb 100644
--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -868,11 +868,11 @@ static struct pernet_operations can_pernet_ops __read_mostly = {
static __init int can_init(void)
{
int err;
/* check for correct padding to be able to use the structs similarly */
- BUILD_BUG_ON(offsetof(struct can_frame, can_dlc) !=
+ BUILD_BUG_ON(offsetof(struct can_frame, len) !=
offsetof(struct canfd_frame, len) ||
offsetof(struct can_frame, data) !=
offsetof(struct canfd_frame, data));
pr_info("can: controller area network core\n");
diff --git a/net/can/gw.c b/net/can/gw.c
index 6b790b6ff8d2..de5e8859ec9b 100644
--- a/net/can/gw.c
+++ b/net/can/gw.c
@@ -205,11 +205,11 @@ static void canframecpy(struct canfd_frame *dst, struct can_frame *src)
* data are copied in the 3 bytes hole of the struct. This is needed
* to make easy compares of the data in the struct cf_mod.
*/
dst->can_id = src->can_id;
- dst->len = src->can_dlc;
+ dst->len = src->len;
*(u64 *)dst->data = *(u64 *)src->data;
}
static void canfdframecpy(struct canfd_frame *dst, struct canfd_frame *src)
{
diff --git a/net/can/j1939/main.c b/net/can/j1939/main.c
index 137054bff9ec..bb914d8b4216 100644
--- a/net/can/j1939/main.c
+++ b/net/can/j1939/main.c
@@ -60,11 +60,11 @@ static void j1939_can_recv(struct sk_buff *iskb, void *data)
*/
cf = (void *)skb->data;
skb_pull(skb, J1939_CAN_HDR);
/* fix length, set to dlc, with 8 maximum */
- skb_trim(skb, min_t(uint8_t, cf->can_dlc, 8));
+ skb_trim(skb, min_t(uint8_t, cf->len, 8));
/* set addr */
skcb = j1939_skb_to_cb(skb);
memset(skcb, 0, sizeof(*skcb));
@@ -333,11 +333,11 @@ int j1939_send_one(struct j1939_priv *priv, struct sk_buff *skb)
skcb->addr.sa;
if (j1939_pgn_is_pdu1(skcb->addr.pgn))
canid |= skcb->addr.da << 8;
cf->can_id = canid;
- cf->can_dlc = dlc;
+ cf->len = dlc;
return can_send(skb, 1);
failed:
kfree_skb(skb);
--
2.28.0
^ permalink raw reply related [flat|nested] 13+ messages in thread
* [PATCH v4 5/7] can: update documentation for DLC usage in Classical CAN
2020-11-09 10:26 [PATCH v4 0/7] Introduce optional DLC element for Classic CAN Oliver Hartkopp
` (3 preceding siblings ...)
2020-11-09 10:26 ` [PATCH v4 4/7] can: replace can_dlc as variable/element for payload length Oliver Hartkopp
@ 2020-11-09 10:26 ` Oliver Hartkopp
2020-11-09 14:50 ` Vincent MAILHOL
2020-11-09 10:26 ` [PATCH v4 6/7] can-dev: introduce helpers to access Classical CAN DLC values Oliver Hartkopp
` (2 subsequent siblings)
7 siblings, 1 reply; 13+ messages in thread
From: Oliver Hartkopp @ 2020-11-09 10:26 UTC (permalink / raw)
To: linux-can, mkl, mailhol.vincent; +Cc: netdev, Oliver Hartkopp
The extension of struct can_frame with the len8_dlc element and the
can_dlc naming issue required an update of the documentation.
Additionally introduce the term 'Classical CAN' which has been established
by CAN in Automation to separate the original CAN2.0 A/B from CAN FD.
Updated some data structures and flags.
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
---
Documentation/networking/can.rst | 68 ++++++++++++++++++++++++--------
1 file changed, 52 insertions(+), 16 deletions(-)
diff --git a/Documentation/networking/can.rst b/Documentation/networking/can.rst
index ff05cbd05e0d..e17c6427bb3a 100644
--- a/Documentation/networking/can.rst
+++ b/Documentation/networking/can.rst
@@ -226,24 +226,40 @@ interface (which is different from TCP/IP due to different addressing
the socket, you can read(2) and write(2) from/to the socket or use
send(2), sendto(2), sendmsg(2) and the recv* counterpart operations
on the socket as usual. There are also CAN specific socket options
described below.
-The basic CAN frame structure and the sockaddr structure are defined
-in include/linux/can.h:
+The Classical CAN frame structure (aka CAN 2.0B), the CAN FD frame structure
+and the sockaddr structure are defined in include/linux/can.h:
.. code-block:: C
struct can_frame {
canid_t can_id; /* 32 bit CAN_ID + EFF/RTR/ERR flags */
- __u8 can_dlc; /* frame payload length in byte (0 .. 8) */
+ union {
+ /* CAN frame payload length in byte (0 .. CAN_MAX_DLEN)
+ * was previously named can_dlc so we need to carry that
+ * name for legacy support
+ */
+ __u8 len;
+ __u8 can_dlc; /* deprecated */
+ };
__u8 __pad; /* padding */
__u8 __res0; /* reserved / padding */
- __u8 __res1; /* reserved / padding */
+ __u8 len8_dlc; /* optional DLC for 8 byte payload length (9 .. 15) */
__u8 data[8] __attribute__((aligned(8)));
};
+Remark: The len element contains the payload length in bytes and should be
+used instead of can_dlc. The deprecated can_dlc was misleadingly named as
+it always contained the plain payload length in bytes and not the so called
+'data length code' (DLC).
+
+To pass the raw DLC from/to a Classical CAN network device the len8_dlc
+element can contain values 9 .. 15 when the len element is 8 (the real
+payload length for all DLC values greater or equal to 8).
+
The alignment of the (linear) payload data[] to a 64bit boundary
allows the user to define their own structs and unions to easily access
the CAN payload. There is no given byteorder on the CAN bus by
default. A read(2) system call on a CAN_RAW socket transfers a
struct can_frame to the user space.
@@ -258,10 +274,27 @@ PF_PACKET socket, that also binds to a specific interface:
int can_ifindex;
union {
/* transport protocol class address info (e.g. ISOTP) */
struct { canid_t rx_id, tx_id; } tp;
+ /* J1939 address information */
+ struct {
+ /* 8 byte name when using dynamic addressing */
+ __u64 name;
+
+ /* pgn:
+ * 8 bit: PS in PDU2 case, else 0
+ * 8 bit: PF
+ * 1 bit: DP
+ * 1 bit: reserved
+ */
+ __u32 pgn;
+
+ /* 1 byte address */
+ __u8 addr;
+ } j1939;
+
/* reserved for future CAN protocols address information */
} can_addr;
};
To determine the interface index an appropriate ioctl() has to
@@ -369,11 +402,11 @@ bitrates for the arbitration phase and the payload phase of the CAN FD frame
and up to 64 bytes of payload. This extended payload length breaks all the
kernel interfaces (ABI) which heavily rely on the CAN frame with fixed eight
bytes of payload (struct can_frame) like the CAN_RAW socket. Therefore e.g.
the CAN_RAW socket supports a new socket option CAN_RAW_FD_FRAMES that
switches the socket into a mode that allows the handling of CAN FD frames
-and (legacy) CAN frames simultaneously (see :ref:`socketcan-rawfd`).
+and Classical CAN frames simultaneously (see :ref:`socketcan-rawfd`).
The struct canfd_frame is defined in include/linux/can.h:
.. code-block:: C
@@ -395,21 +428,21 @@ all structure elements can be used as-is - only the data[] becomes extended.
When introducing the struct canfd_frame it turned out that the data length
code (DLC) of the struct can_frame was used as a length information as the
length and the DLC has a 1:1 mapping in the range of 0 .. 8. To preserve
the easy handling of the length information the canfd_frame.len element
contains a plain length value from 0 .. 64. So both canfd_frame.len and
-can_frame.can_dlc are equal and contain a length information and no DLC.
+can_frame.len are equal and contain a length information and no DLC.
For details about the distinction of CAN and CAN FD capable devices and
the mapping to the bus-relevant data length code (DLC), see :ref:`socketcan-can-fd-driver`.
The length of the two CAN(FD) frame structures define the maximum transfer
unit (MTU) of the CAN(FD) network interface and skbuff data length. Two
definitions are specified for CAN specific MTUs in include/linux/can.h:
.. code-block:: C
- #define CAN_MTU (sizeof(struct can_frame)) == 16 => 'legacy' CAN frame
+ #define CAN_MTU (sizeof(struct can_frame)) == 16 => Classical CAN frame
#define CANFD_MTU (sizeof(struct canfd_frame)) == 72 => CAN FD frame
.. _socketcan-raw-sockets:
@@ -607,11 +640,11 @@ Example:
if (nbytes == CANFD_MTU) {
printf("got CAN FD frame with length %d\n", cfd.len);
/* cfd.flags contains valid data */
} else if (nbytes == CAN_MTU) {
- printf("got legacy CAN frame with length %d\n", cfd.len);
+ printf("got Classical CAN frame with length %d\n", cfd.len);
/* cfd.flags is undefined */
} else {
fprintf(stderr, "read: invalid CAN(FD) frame\n");
return 1;
}
@@ -621,21 +654,21 @@ Example:
printf("can_id: %X data length: %d data: ", cfd.can_id, cfd.len);
for (i = 0; i < cfd.len; i++)
printf("%02X ", cfd.data[i]);
When reading with size CANFD_MTU only returns CAN_MTU bytes that have
-been received from the socket a legacy CAN frame has been read into the
+been received from the socket a Classical CAN frame has been read into the
provided CAN FD structure. Note that the canfd_frame.flags data field is
not specified in the struct can_frame and therefore it is only valid in
CANFD_MTU sized CAN FD frames.
Implementation hint for new CAN applications:
To build a CAN FD aware application use struct canfd_frame as basic CAN
data structure for CAN_RAW based applications. When the application is
executed on an older Linux kernel and switching the CAN_RAW_FD_FRAMES
-socket option returns an error: No problem. You'll get legacy CAN frames
+socket option returns an error: No problem. You'll get Classical CAN frames
or CAN FD frames and can process them the same way.
When sending to CAN devices make sure that the device is capable to handle
CAN FD frames by checking if the device maximum transfer unit is CANFD_MTU.
The CAN device MTU can be retrieved e.g. with a SIOCGIFMTU ioctl() syscall.
@@ -840,10 +873,12 @@ TX_RESET_MULTI_IDX:
Reset the index for the multiple frame transmission.
RX_RTR_FRAME:
Send reply for RTR-request (placed in op->frames[0]).
+CAN_FD_FRAME:
+ The CAN frames following the bcm_msg_head are struct canfd_frame's
Broadcast Manager Transmission Timers
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Periodic transmission configurations may use up to two interval timers.
@@ -1024,11 +1059,11 @@ In this example an application requests any CAN traffic from vcan0::
Additional procfs files in /proc/net/can::
stats - SocketCAN core statistics (rx/tx frames, match ratios, ...)
reset_stats - manual statistic reset
- version - prints the SocketCAN core version and the ABI version
+ version - prints SocketCAN core and ABI version (removed in Linux 5.10)
Writing Own CAN Protocol Modules
--------------------------------
@@ -1068,11 +1103,11 @@ General Settings
.. code-block:: C
dev->type = ARPHRD_CAN; /* the netdevice hardware type */
dev->flags = IFF_NOARP; /* CAN has no arp */
- dev->mtu = CAN_MTU; /* sizeof(struct can_frame) -> legacy CAN interface */
+ dev->mtu = CAN_MTU; /* sizeof(struct can_frame) -> Classical CAN interface */
or alternative, when the controller supports CAN with flexible data rate:
dev->mtu = CANFD_MTU; /* sizeof(struct canfd_frame) -> CAN FD interface */
The struct can_frame or struct canfd_frame is the payload of each socket
@@ -1182,10 +1217,11 @@ Setting CAN device properties::
[ one-shot { on | off } ]
[ berr-reporting { on | off } ]
[ fd { on | off } ]
[ fd-non-iso { on | off } ]
[ presume-ack { on | off } ]
+ [ cc-len8-dlc { on | off } ]
[ restart-ms TIME-MS ]
[ restart ]
Where: BITRATE := { 1..1000000 }
@@ -1324,26 +1360,26 @@ CAN FD (Flexible Data Rate) Driver Support
CAN FD capable CAN controllers support two different bitrates for the
arbitration phase and the payload phase of the CAN FD frame. Therefore a
second bit timing has to be specified in order to enable the CAN FD bitrate.
Additionally CAN FD capable CAN controllers support up to 64 bytes of
-payload. The representation of this length in can_frame.can_dlc and
+payload. The representation of this length in can_frame.len and
canfd_frame.len for userspace applications and inside the Linux network
layer is a plain value from 0 .. 64 instead of the CAN 'data length code'.
-The data length code was a 1:1 mapping to the payload length in the legacy
+The data length code was a 1:1 mapping to the payload length in the Classical
CAN frames anyway. The payload length to the bus-relevant DLC mapping is
only performed inside the CAN drivers, preferably with the helper
functions can_dlc2len() and can_len2dlc().
The CAN netdevice driver capabilities can be distinguished by the network
devices maximum transfer unit (MTU)::
- MTU = 16 (CAN_MTU) => sizeof(struct can_frame) => 'legacy' CAN device
+ MTU = 16 (CAN_MTU) => sizeof(struct can_frame) => Classical CAN device
MTU = 72 (CANFD_MTU) => sizeof(struct canfd_frame) => CAN FD capable device
The CAN device MTU can be retrieved e.g. with a SIOCGIFMTU ioctl() syscall.
-N.B. CAN FD capable devices can also handle and send legacy CAN frames.
+N.B. CAN FD capable devices can also handle and send Classical CAN frames.
When configuring CAN FD capable CAN controllers an additional 'data' bitrate
has to be set. This bitrate for the data phase of the CAN FD frame has to be
at least the bitrate which was configured for the arbitration phase. This
second bitrate is specified analogue to the first bitrate but the bitrate
--
2.28.0
^ permalink raw reply related [flat|nested] 13+ messages in thread
* [PATCH v4 6/7] can-dev: introduce helpers to access Classical CAN DLC values
2020-11-09 10:26 [PATCH v4 0/7] Introduce optional DLC element for Classic CAN Oliver Hartkopp
` (4 preceding siblings ...)
2020-11-09 10:26 ` [PATCH v4 5/7] can: update documentation for DLC usage in Classical CAN Oliver Hartkopp
@ 2020-11-09 10:26 ` Oliver Hartkopp
2020-11-09 10:26 ` [PATCH v4 7/7] can-dev: add len8_dlc support for various CAN USB adapters Oliver Hartkopp
2020-11-09 11:51 ` [PATCH v4 0/7] Introduce optional DLC element for Classic CAN Oliver Hartkopp
7 siblings, 0 replies; 13+ messages in thread
From: Oliver Hartkopp @ 2020-11-09 10:26 UTC (permalink / raw)
To: linux-can, mkl, mailhol.vincent; +Cc: netdev, Oliver Hartkopp
can_get_len8_dlc: get value to fill len8_dlc at frame reception time
can_get_cc_dlc: get DLC value to be written into CAN controller
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
---
include/linux/can/dev.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index 72671184a7a2..410a53a09f1b 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -168,10 +168,29 @@ static inline bool can_is_canfd_skb(const struct sk_buff *skb)
{
/* the CAN specific type of skb is identified by its data length */
return skb->len == CANFD_MTU;
}
+/* helper to handle len8_dlc value for Classical CAN raw DLC access */
+static inline u8 can_check_len8_dlc(u32 ctrlmode, u8 len, u8 dlc, u8 ret)
+{
+ /* return value for len8_dlc only if all conditions apply */
+ if ((ctrlmode & CAN_CTRLMODE_CC_LEN8_DLC) &&
+ (len == CAN_MAX_DLEN) &&
+ (dlc > CAN_MAX_DLEN && dlc <= CAN_MAX_RAW_DLC))
+ ret = dlc;
+
+ /* no valid len8_dlc value -> return provided default value */
+ return ret;
+}
+
+/* get value to fill len8_dlc in struct can_frame at frame reception time */
+#define can_get_len8_dlc(cm, len, dlc) can_check_len8_dlc(cm, len, dlc, 0)
+
+/* get DLC value to be written into Classical CAN controller at tx time */
+#define can_get_cc_dlc(cm, len, dlc) can_check_len8_dlc(cm, len, dlc, len)
+
/* helper to define static CAN controller features at device creation time */
static inline void can_set_static_ctrlmode(struct net_device *dev,
u32 static_mode)
{
struct can_priv *priv = netdev_priv(dev);
--
2.28.0
^ permalink raw reply related [flat|nested] 13+ messages in thread
* [PATCH v4 7/7] can-dev: add len8_dlc support for various CAN USB adapters
2020-11-09 10:26 [PATCH v4 0/7] Introduce optional DLC element for Classic CAN Oliver Hartkopp
` (5 preceding siblings ...)
2020-11-09 10:26 ` [PATCH v4 6/7] can-dev: introduce helpers to access Classical CAN DLC values Oliver Hartkopp
@ 2020-11-09 10:26 ` Oliver Hartkopp
2020-11-09 11:51 ` [PATCH v4 0/7] Introduce optional DLC element for Classic CAN Oliver Hartkopp
7 siblings, 0 replies; 13+ messages in thread
From: Oliver Hartkopp @ 2020-11-09 10:26 UTC (permalink / raw)
To: linux-can, mkl, mailhol.vincent; +Cc: netdev, Oliver Hartkopp
Support the Classical CAN raw DLC functionality to send and receive DLC
values from 9 .. 15 on various Classican CAN capable USB network drivers:
- gs_usb
- pcan_usb
- pcan_usb_fd
- usb_8dev
Tested-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
---
drivers/net/can/usb/gs_usb.c | 8 ++++++--
drivers/net/can/usb/peak_usb/pcan_usb.c | 8 ++++++--
drivers/net/can/usb/peak_usb/pcan_usb_fd.c | 17 ++++++++++++-----
drivers/net/can/usb/usb_8dev.c | 9 ++++++---
4 files changed, 30 insertions(+), 12 deletions(-)
diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index 3a097c240e5a..fab6ed073e45 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -330,10 +330,13 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
return;
cf->can_id = hf->can_id;
cf->len = can_get_cc_len(hf->len);
+ cf->len8_dlc = can_get_len8_dlc(dev->can.ctrlmode, cf->len,
+ hf->len);
+
memcpy(cf->data, hf->data, 8);
/* ERROR frames tell us information about the controller */
if (hf->can_id & CAN_ERR_FLAG)
gs_update_state(dev, cf);
@@ -502,11 +505,12 @@ static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
hf->channel = dev->channel;
cf = (struct can_frame *)skb->data;
hf->can_id = cf->can_id;
- hf->len = cf->len;
+ hf->len = can_get_cc_dlc(dev->can.ctrlmode, cf->len, cf->len8_dlc);
+
memcpy(hf->data, cf->data, cf->len);
usb_fill_bulk_urb(urb, dev->udev,
usb_sndbulkpipe(dev->udev, GSUSB_ENDPOINT_OUT),
hf,
@@ -856,11 +860,11 @@ static struct gs_can *gs_make_candev(unsigned int channel,
dev->can.state = CAN_STATE_STOPPED;
dev->can.clock.freq = bt_const->fclk_can;
dev->can.bittiming_const = &dev->bt_const;
dev->can.do_set_bittiming = gs_usb_set_bittiming;
- dev->can.ctrlmode_supported = 0;
+ dev->can.ctrlmode_supported = CAN_CTRLMODE_CC_LEN8_DLC;
if (bt_const->feature & GS_CAN_FEATURE_LISTEN_ONLY)
dev->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
if (bt_const->feature & GS_CAN_FEATURE_LOOP_BACK)
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb.c b/drivers/net/can/usb/peak_usb/pcan_usb.c
index abecb77e34f2..105a17dc8075 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb.c
@@ -733,10 +733,12 @@ static int pcan_usb_decode_data(struct pcan_usb_msg_context *mc, u8 status_len)
cf->can_id = le16_to_cpu(tmp16) >> 5;
}
cf->len = can_get_cc_len(rec_len);
+ cf->len8_dlc = can_get_len8_dlc(mc->pdev->dev.can.ctrlmode, cf->len,
+ rec_len);
/* Only first packet timestamp is a word */
if (pcan_usb_decode_ts(mc, !mc->rec_ts_idx))
goto decode_failed;
@@ -836,11 +838,12 @@ static int pcan_usb_encode_msg(struct peak_usb_device *dev, struct sk_buff *skb,
obuf[1] = 1;
pc = obuf + PCAN_USB_MSG_HEADER_LEN;
/* status/len byte */
- *pc = cf->len;
+ *pc = can_get_cc_dlc(dev->can.ctrlmode, cf->len, cf->len8_dlc);
+
if (cf->can_id & CAN_RTR_FLAG)
*pc |= PCAN_USB_STATUSLEN_RTR;
/* can id */
if (cf->can_id & CAN_EFF_FLAG) {
@@ -990,11 +993,12 @@ static const struct can_bittiming_const pcan_usb_const = {
const struct peak_usb_adapter pcan_usb = {
.name = "PCAN-USB",
.device_id = PCAN_USB_PRODUCT_ID,
.ctrl_count = 1,
.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY |
- CAN_CTRLMODE_BERR_REPORTING,
+ CAN_CTRLMODE_BERR_REPORTING |
+ CAN_CTRLMODE_CC_LEN8_DLC,
.clock = {
.freq = PCAN_USB_CRYSTAL_HZ / 2 ,
},
.bittiming_const = &pcan_usb_const,
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
index 3e875cdbadac..bd90ce8c3f15 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
@@ -492,16 +492,21 @@ static int pcan_usb_fd_decode_canmsg(struct pcan_usb_fd_if *usb_if,
if (rx_msg_flags & PUCAN_MSG_ERROR_STATE_IND)
cfd->flags |= CANFD_ESI;
cfd->len = can_dlc2len(pucan_msg_get_dlc(rm));
} else {
+ struct can_frame *cf;
+
/* CAN 2.0 frame case */
skb = alloc_can_skb(netdev, (struct can_frame **)&cfd);
if (!skb)
return -ENOMEM;
cfd->len = can_get_cc_len(pucan_msg_get_dlc(rm));
+ cf = (struct can_frame *)cfd;
+ cf->len8_dlc = can_get_len8_dlc(dev->can.ctrlmode, cf->len,
+ pucan_msg_get_dlc(rm));
}
cfd->can_id = le32_to_cpu(rm->can_id);
if (rx_msg_flags & PUCAN_MSG_EXT_ID)
@@ -764,12 +769,14 @@ static int pcan_usb_fd_encode_msg(struct peak_usb_device *dev,
tx_msg_flags |= PUCAN_MSG_BITRATE_SWITCH;
if (cfd->flags & CANFD_ESI)
tx_msg_flags |= PUCAN_MSG_ERROR_STATE_IND;
} else {
+ struct can_frame *cf = (struct can_frame *)cfd;
+
/* CAND 2.0 frames */
- len = cfd->len;
+ len = can_get_cc_dlc(dev->can.ctrlmode, cf->len, cf->len8_dlc);
if (cfd->can_id & CAN_RTR_FLAG)
tx_msg_flags |= PUCAN_MSG_RTR;
}
@@ -1033,11 +1040,11 @@ static const struct can_bittiming_const pcan_usb_fd_data_const = {
const struct peak_usb_adapter pcan_usb_fd = {
.name = "PCAN-USB FD",
.device_id = PCAN_USBFD_PRODUCT_ID,
.ctrl_count = PCAN_USBFD_CHANNEL_COUNT,
- .ctrlmode_supported = CAN_CTRLMODE_FD |
+ .ctrlmode_supported = CAN_CTRLMODE_FD | CAN_CTRLMODE_CC_LEN8_DLC |
CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
.clock = {
.freq = PCAN_UFD_CRYSTAL_HZ,
},
.bittiming_const = &pcan_usb_fd_const,
@@ -1105,11 +1112,11 @@ static const struct can_bittiming_const pcan_usb_chip_data_const = {
const struct peak_usb_adapter pcan_usb_chip = {
.name = "PCAN-Chip USB",
.device_id = PCAN_USBCHIP_PRODUCT_ID,
.ctrl_count = PCAN_USBFD_CHANNEL_COUNT,
- .ctrlmode_supported = CAN_CTRLMODE_FD |
+ .ctrlmode_supported = CAN_CTRLMODE_FD | CAN_CTRLMODE_CC_LEN8_DLC |
CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
.clock = {
.freq = PCAN_UFD_CRYSTAL_HZ,
},
.bittiming_const = &pcan_usb_chip_const,
@@ -1177,11 +1184,11 @@ static const struct can_bittiming_const pcan_usb_pro_fd_data_const = {
const struct peak_usb_adapter pcan_usb_pro_fd = {
.name = "PCAN-USB Pro FD",
.device_id = PCAN_USBPROFD_PRODUCT_ID,
.ctrl_count = PCAN_USBPROFD_CHANNEL_COUNT,
- .ctrlmode_supported = CAN_CTRLMODE_FD |
+ .ctrlmode_supported = CAN_CTRLMODE_FD | CAN_CTRLMODE_CC_LEN8_DLC |
CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
.clock = {
.freq = PCAN_UFD_CRYSTAL_HZ,
},
.bittiming_const = &pcan_usb_pro_fd_const,
@@ -1249,11 +1256,11 @@ static const struct can_bittiming_const pcan_usb_x6_data_const = {
const struct peak_usb_adapter pcan_usb_x6 = {
.name = "PCAN-USB X6",
.device_id = PCAN_USBX6_PRODUCT_ID,
.ctrl_count = PCAN_USBPROFD_CHANNEL_COUNT,
- .ctrlmode_supported = CAN_CTRLMODE_FD |
+ .ctrlmode_supported = CAN_CTRLMODE_FD | CAN_CTRLMODE_CC_LEN8_DLC |
CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
.clock = {
.freq = PCAN_UFD_CRYSTAL_HZ,
},
.bittiming_const = &pcan_usb_x6_const,
diff --git a/drivers/net/can/usb/usb_8dev.c b/drivers/net/can/usb/usb_8dev.c
index 8aedb2ba37fb..e15650c0663e 100644
--- a/drivers/net/can/usb/usb_8dev.c
+++ b/drivers/net/can/usb/usb_8dev.c
@@ -469,10 +469,12 @@ static void usb_8dev_rx_can_msg(struct usb_8dev_priv *priv,
if (!skb)
return;
cf->can_id = be32_to_cpu(msg->id);
cf->len = can_get_cc_len(msg->dlc & 0xF);
+ cf->len8_dlc = can_get_len8_dlc(priv->can.ctrlmode, cf->len,
+ msg->dlc & 0xF);
if (msg->flags & USB_8DEV_EXTID)
cf->can_id |= CAN_EFF_FLAG;
if (msg->flags & USB_8DEV_RTR)
@@ -635,11 +637,11 @@ static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb,
if (cf->can_id & CAN_EFF_FLAG)
msg->flags |= USB_8DEV_EXTID;
msg->id = cpu_to_be32(cf->can_id & CAN_ERR_MASK);
- msg->dlc = cf->len;
+ msg->dlc = can_get_cc_dlc(priv->can.ctrlmode, cf->len, cf->len8_dlc);
memcpy(msg->data, cf->data, cf->len);
msg->end = USB_8DEV_DATA_END;
for (i = 0; i < MAX_TX_URBS; i++) {
if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
@@ -925,12 +927,13 @@ static int usb_8dev_probe(struct usb_interface *intf,
priv->can.clock.freq = USB_8DEV_ABP_CLOCK;
priv->can.bittiming_const = &usb_8dev_bittiming_const;
priv->can.do_set_mode = usb_8dev_set_mode;
priv->can.do_get_berr_counter = usb_8dev_get_berr_counter;
priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
- CAN_CTRLMODE_LISTENONLY |
- CAN_CTRLMODE_ONE_SHOT;
+ CAN_CTRLMODE_LISTENONLY |
+ CAN_CTRLMODE_ONE_SHOT |
+ CAN_CTRLMODE_CC_LEN8_DLC;
netdev->netdev_ops = &usb_8dev_netdev_ops;
netdev->flags |= IFF_ECHO; /* we support local echo */
--
2.28.0
^ permalink raw reply related [flat|nested] 13+ messages in thread
* Re: [PATCH v4 0/7] Introduce optional DLC element for Classic CAN
2020-11-09 10:26 [PATCH v4 0/7] Introduce optional DLC element for Classic CAN Oliver Hartkopp
` (6 preceding siblings ...)
2020-11-09 10:26 ` [PATCH v4 7/7] can-dev: add len8_dlc support for various CAN USB adapters Oliver Hartkopp
@ 2020-11-09 11:51 ` Oliver Hartkopp
7 siblings, 0 replies; 13+ messages in thread
From: Oliver Hartkopp @ 2020-11-09 11:51 UTC (permalink / raw)
To: linux-can, mkl, mailhol.vincent; +Cc: netdev
On 09.11.20 11:26, Oliver Hartkopp wrote:
> Introduce improved DLC handling for Classic CAN with introduces a new
> element 'len8_dlc' to the struct can_frame and additionally rename
> the 'can_dlc' element to 'len' as it represents a plain payload length.
>
> Before implementing the CAN_CTRLMODE_CC_LEN8_DLC handling on driver level
> this patch set cleans up and renames the relevant code.
>
> No functional changes.
>
> This patch set is based on mkl/linux-can.git (testing branch).
In fact it is based on the latest net-next ...
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git
copy/paste error, sorry.
m(
>
> Changes in v2:
> - rephrase commit message of patch 4 about can_dlc replacement
>
> Changes in v3:
> - remove unnecessarily introduced u8 cast in flexcan.c
>
> Changes in v4:
> - adopt phrasing suggestions from Vincent Mailhol
> - separate and extend CAN documentation (Documentation/networking/can.rst)
> - add new patches for len8_dlc handling for CAN drivers
> - add new helpers in include/linux/can/dev.h
> - add len8_dlc support for various CAN USB adapters as reference
>
> Oliver Hartkopp (7):
> can: add optional DLC element to Classical CAN frame structure
> can: rename get_can_dlc() macro with can_get_cc_len()
> can: remove obsolete get_canfd_dlc() macro
> can: replace can_dlc as variable/element for payload length
> can: update documentation for DLC usage in Classical CAN
> can-dev: introduce helpers to access Classical CAN DLC values
> can-dev: add len8_dlc support for various CAN USB adapters
>
> Documentation/networking/can.rst | 68 ++++++++++++++-----
> drivers/net/can/at91_can.c | 14 ++--
> drivers/net/can/c_can/c_can.c | 20 +++---
> drivers/net/can/cc770/cc770.c | 14 ++--
> drivers/net/can/dev.c | 10 +--
> drivers/net/can/flexcan.c | 4 +-
> drivers/net/can/grcan.c | 10 +--
> drivers/net/can/ifi_canfd/ifi_canfd.c | 6 +-
> drivers/net/can/janz-ican3.c | 20 +++---
> drivers/net/can/kvaser_pciefd.c | 4 +-
> drivers/net/can/m_can/m_can.c | 6 +-
> drivers/net/can/mscan/mscan.c | 20 +++---
> drivers/net/can/pch_can.c | 14 ++--
> drivers/net/can/peak_canfd/peak_canfd.c | 16 ++---
> drivers/net/can/rcar/rcar_can.c | 14 ++--
> drivers/net/can/rcar/rcar_canfd.c | 8 +--
> drivers/net/can/rx-offload.c | 2 +-
> drivers/net/can/sja1000/sja1000.c | 10 +--
> drivers/net/can/slcan.c | 32 ++++-----
> drivers/net/can/softing/softing_fw.c | 2 +-
> drivers/net/can/softing/softing_main.c | 14 ++--
> drivers/net/can/spi/hi311x.c | 20 +++---
> drivers/net/can/spi/mcp251x.c | 20 +++---
> .../net/can/spi/mcp251xfd/mcp251xfd-core.c | 4 +-
> drivers/net/can/sun4i_can.c | 10 +--
> drivers/net/can/ti_hecc.c | 8 +--
> drivers/net/can/usb/ems_usb.c | 16 ++---
> drivers/net/can/usb/esd_usb2.c | 16 ++---
> drivers/net/can/usb/gs_usb.c | 20 +++---
> .../net/can/usb/kvaser_usb/kvaser_usb_core.c | 2 +-
> .../net/can/usb/kvaser_usb/kvaser_usb_hydra.c | 20 +++---
> .../net/can/usb/kvaser_usb/kvaser_usb_leaf.c | 22 +++---
> drivers/net/can/usb/mcba_usb.c | 10 +--
> drivers/net/can/usb/peak_usb/pcan_usb.c | 20 +++---
> drivers/net/can/usb/peak_usb/pcan_usb_fd.c | 29 +++++---
> drivers/net/can/usb/peak_usb/pcan_usb_pro.c | 14 ++--
> drivers/net/can/usb/ucan.c | 20 +++---
> drivers/net/can/usb/usb_8dev.c | 21 +++---
> drivers/net/can/xilinx_can.c | 12 ++--
> include/linux/can/dev.h | 30 ++++++--
> include/linux/can/dev/peak_canfd.h | 2 +-
> include/uapi/linux/can.h | 38 +++++++----
> include/uapi/linux/can/netlink.h | 1 +
> net/can/af_can.c | 2 +-
> net/can/gw.c | 2 +-
> net/can/j1939/main.c | 4 +-
> 46 files changed, 377 insertions(+), 294 deletions(-)
>
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [PATCH v4 4/7] can: replace can_dlc as variable/element for payload length
2020-11-09 10:26 ` [PATCH v4 4/7] can: replace can_dlc as variable/element for payload length Oliver Hartkopp
@ 2020-11-09 12:59 ` Vincent MAILHOL
2020-11-09 15:38 ` Oliver Hartkopp
0 siblings, 1 reply; 13+ messages in thread
From: Vincent MAILHOL @ 2020-11-09 12:59 UTC (permalink / raw)
To: Oliver Hartkopp; +Cc: linux-can, Marc Kleine-Budde, netdev
On Mon. 9 Nov 2020 at 19:26, Oliver Hartkopp wrote:
> diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
> index b2e8df8e4cb0..72671184a7a2 100644
> --- a/include/linux/can/dev.h
> +++ b/include/linux/can/dev.h
> @@ -183,12 +183,12 @@ static inline void can_set_static_ctrlmode(struct net_device *dev,
> /* override MTU which was set by default in can_setup()? */
> if (static_mode & CAN_CTRLMODE_FD)
> dev->mtu = CANFD_MTU;
> }
>
> -/* get data length from can_dlc with sanitized can_dlc */
> -u8 can_dlc2len(u8 can_dlc);
> +/* get data length from raw data length code (DLC) */
/*
* convert a given data length code (dlc) of an FD CAN frame into a
* valid data length of max. 64 bytes.
*/
I missed this point during my previous review: the can_dlc2len() function
is only valid for CAN FD frames. Comments should reflect this fact.
> +u8 can_dlc2len(u8 dlc);
Concerning the name:
* can_get_cc_len() converts a Classical CAN frame DLC into a data
length.
* can_dlc2len() converts an FD CAN frame DLC into a data length.
Just realized that both macro/function do similar things so we could
think of a similar naming as well.
* Example 1: can_get_cc_len() and can_get_fd_len()
* Example 2: can_cc_dlc2len() and can_fd_dlc2len()
Or we could simply leave things as they are, this is not a big issue
as long as the comments clearly state which one is for classical
frames and which one is for FD frames.
>
> /* map the sanitized data length to an appropriate data length code */
> u8 can_len2dlc(u8 len);
can_len2dlc() might be renamed (e.g. can_get_fd_dlc()) if Example 1
solution is chosen.
> struct net_device *alloc_candev_mqs(int sizeof_priv, unsigned int echo_skb_max,
Yours sincerely,
Vincent Mailhol
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [PATCH v4 5/7] can: update documentation for DLC usage in Classical CAN
2020-11-09 10:26 ` [PATCH v4 5/7] can: update documentation for DLC usage in Classical CAN Oliver Hartkopp
@ 2020-11-09 14:50 ` Vincent MAILHOL
2020-11-09 15:51 ` Oliver Hartkopp
0 siblings, 1 reply; 13+ messages in thread
From: Vincent MAILHOL @ 2020-11-09 14:50 UTC (permalink / raw)
To: Oliver Hartkopp; +Cc: linux-can, Marc Kleine-Budde, netdev
On Mon. 9 Nov 2020 at 19:26, Oliver Hartkopp wrote:
>
> The extension of struct can_frame with the len8_dlc element and the
> can_dlc naming issue required an update of the documentation.
>
> Additionally introduce the term 'Classical CAN' which has been established
> by CAN in Automation to separate the original CAN2.0 A/B from CAN FD.
>
> Updated some data structures and flags.
>
> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
> ---
> Documentation/networking/can.rst | 68 ++++++++++++++++++++++++--------
> 1 file changed, 52 insertions(+), 16 deletions(-)
>
> diff --git a/Documentation/networking/can.rst b/Documentation/networking/can.rst
> index ff05cbd05e0d..e17c6427bb3a 100644
> --- a/Documentation/networking/can.rst
> +++ b/Documentation/networking/can.rst
> @@ -226,24 +226,40 @@ interface (which is different from TCP/IP due to different addressing
> the socket, you can read(2) and write(2) from/to the socket or use
> send(2), sendto(2), sendmsg(2) and the recv* counterpart operations
> on the socket as usual. There are also CAN specific socket options
> described below.
>
> -The basic CAN frame structure and the sockaddr structure are defined
> -in include/linux/can.h:
> +The Classical CAN frame structure (aka CAN 2.0B), the CAN FD frame structure
> +and the sockaddr structure are defined in include/linux/can.h:
>
> .. code-block:: C
>
> struct can_frame {
> canid_t can_id; /* 32 bit CAN_ID + EFF/RTR/ERR flags */
> - __u8 can_dlc; /* frame payload length in byte (0 .. 8) */
> + union {
> + /* CAN frame payload length in byte (0 .. CAN_MAX_DLEN)
> + * was previously named can_dlc so we need to carry that
> + * name for legacy support
> + */
> + __u8 len;
> + __u8 can_dlc; /* deprecated */
> + };
> __u8 __pad; /* padding */
> __u8 __res0; /* reserved / padding */
> - __u8 __res1; /* reserved / padding */
> + __u8 len8_dlc; /* optional DLC for 8 byte payload length (9 .. 15) */
> __u8 data[8] __attribute__((aligned(8)));
> };
>
> +Remark: The len element contains the payload length in bytes and should be
> +used instead of can_dlc. The deprecated can_dlc was misleadingly named as
> +it always contained the plain payload length in bytes and not the so called
> +'data length code' (DLC).
> +
> +To pass the raw DLC from/to a Classical CAN network device the len8_dlc
> +element can contain values 9 .. 15 when the len element is 8 (the real
> +payload length for all DLC values greater or equal to 8).
The "Classical CAN network device" part could make the reader
misunderstand that FD capable controllers can not handle Classical CAN
frames with DLC greater than 8. All the CAN-FD controllers I am aware
of can emit both Classical and FD frames. On the contrary, some
Classical CAN controllers might not support sending DLCs greater than
8. Propose to add the nuance that this depends on the device property:
+To pass the raw DLC from/to a capable network device
+(c.f. cc-len8-dlc CAN device property), the len8_dlc element can
+contain values 9 .. 15 when the len element is 8 (the real payload
+length for all DLC values greater or equal to 8).
> +
> The alignment of the (linear) payload data[] to a 64bit boundary
> allows the user to define their own structs and unions to easily access
> the CAN payload. There is no given byteorder on the CAN bus by
> default. A read(2) system call on a CAN_RAW socket transfers a
> struct can_frame to the user space.
> @@ -258,10 +274,27 @@ PF_PACKET socket, that also binds to a specific interface:
> int can_ifindex;
> union {
> /* transport protocol class address info (e.g. ISOTP) */
> struct { canid_t rx_id, tx_id; } tp;
>
> + /* J1939 address information */
> + struct {
> + /* 8 byte name when using dynamic addressing */
> + __u64 name;
> +
> + /* pgn:
> + * 8 bit: PS in PDU2 case, else 0
> + * 8 bit: PF
> + * 1 bit: DP
> + * 1 bit: reserved
> + */
> + __u32 pgn;
> +
> + /* 1 byte address */
> + __u8 addr;
> + } j1939;
> +
> /* reserved for future CAN protocols address information */
> } can_addr;
> };
This looks like some J1939 code. Did you mix your patches?
> To determine the interface index an appropriate ioctl() has to
> @@ -369,11 +402,11 @@ bitrates for the arbitration phase and the payload phase of the CAN FD frame
> and up to 64 bytes of payload. This extended payload length breaks all the
> kernel interfaces (ABI) which heavily rely on the CAN frame with fixed eight
> bytes of payload (struct can_frame) like the CAN_RAW socket. Therefore e.g.
> the CAN_RAW socket supports a new socket option CAN_RAW_FD_FRAMES that
> switches the socket into a mode that allows the handling of CAN FD frames
> -and (legacy) CAN frames simultaneously (see :ref:`socketcan-rawfd`).
> +and Classical CAN frames simultaneously (see :ref:`socketcan-rawfd`).
>
> The struct canfd_frame is defined in include/linux/can.h:
>
> .. code-block:: C
>
> @@ -395,21 +428,21 @@ all structure elements can be used as-is - only the data[] becomes extended.
In below paragraph, needs to add an exception for can_frame.len8_dlc:
The struct canfd_frame and the existing struct can_frame have the can_id,
the payload length and the payload data at the same offset inside their
structures. This allows to handle the different structures very similar.
When the content of a struct can_frame is copied into a struct canfd_frame
-all structure elements can be used as-is - only the data[] becomes extended.
+all structure elements (except the len8_dlc field) can be used as-is and the
+data[] becomes extended.
> When introducing the struct canfd_frame it turned out that the data length
> code (DLC) of the struct can_frame was used as a length information as the
> length and the DLC has a 1:1 mapping in the range of 0 .. 8. To preserve
> the easy handling of the length information the canfd_frame.len element
> contains a plain length value from 0 .. 64. So both canfd_frame.len and
> -can_frame.can_dlc are equal and contain a length information and no DLC.
> +can_frame.len are equal and contain a length information and no DLC.
> For details about the distinction of CAN and CAN FD capable devices and
> the mapping to the bus-relevant data length code (DLC), see :ref:`socketcan-can-fd-driver`.
Now that the field has been renamed, the "1:1 mapping" explanation
becomes obsolete. I propose to drastically reduce the paragraph:
+Despite being formerly named can_dlc, the len field of both struct
+can_frame and struct canfd_frame are equal and contain a plain length
+value from 0 .. 64; no DLC. For details about the distinction of CAN
+and CAN FD capable devices and the mapping to the bus-relevant data
+length code (DLC), see :ref:`socketcan-can-fd-driver`.
> The length of the two CAN(FD) frame structures define the maximum transfer
> unit (MTU) of the CAN(FD) network interface and skbuff data length. Two
> definitions are specified for CAN specific MTUs in include/linux/can.h:
>
> .. code-block:: C
>
> - #define CAN_MTU (sizeof(struct can_frame)) == 16 => 'legacy' CAN frame
> + #define CAN_MTU (sizeof(struct can_frame)) == 16 => Classical CAN frame
> #define CANFD_MTU (sizeof(struct canfd_frame)) == 72 => CAN FD frame
>
>
> .. _socketcan-raw-sockets:
>
> @@ -607,11 +640,11 @@ Example:
>
> if (nbytes == CANFD_MTU) {
> printf("got CAN FD frame with length %d\n", cfd.len);
> /* cfd.flags contains valid data */
> } else if (nbytes == CAN_MTU) {
> - printf("got legacy CAN frame with length %d\n", cfd.len);
> + printf("got Classical CAN frame with length %d\n", cfd.len);
> /* cfd.flags is undefined */
> } else {
> fprintf(stderr, "read: invalid CAN(FD) frame\n");
> return 1;
> }
> @@ -621,21 +654,21 @@ Example:
> printf("can_id: %X data length: %d data: ", cfd.can_id, cfd.len);
> for (i = 0; i < cfd.len; i++)
> printf("%02X ", cfd.data[i]);
>
> When reading with size CANFD_MTU only returns CAN_MTU bytes that have
> -been received from the socket a legacy CAN frame has been read into the
> +been received from the socket a Classical CAN frame has been read into the
> provided CAN FD structure. Note that the canfd_frame.flags data field is
> not specified in the struct can_frame and therefore it is only valid in
> CANFD_MTU sized CAN FD frames.
>
> Implementation hint for new CAN applications:
>
> To build a CAN FD aware application use struct canfd_frame as basic CAN
> data structure for CAN_RAW based applications. When the application is
> executed on an older Linux kernel and switching the CAN_RAW_FD_FRAMES
> -socket option returns an error: No problem. You'll get legacy CAN frames
> +socket option returns an error: No problem. You'll get Classical CAN frames
> or CAN FD frames and can process them the same way.
>
> When sending to CAN devices make sure that the device is capable to handle
> CAN FD frames by checking if the device maximum transfer unit is CANFD_MTU.
> The CAN device MTU can be retrieved e.g. with a SIOCGIFMTU ioctl() syscall.
> @@ -840,10 +873,12 @@ TX_RESET_MULTI_IDX:
> Reset the index for the multiple frame transmission.
>
> RX_RTR_FRAME:
> Send reply for RTR-request (placed in op->frames[0]).
>
> +CAN_FD_FRAME:
> + The CAN frames following the bcm_msg_head are struct canfd_frame's
>
> Broadcast Manager Transmission Timers
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Periodic transmission configurations may use up to two interval timers.
> @@ -1024,11 +1059,11 @@ In this example an application requests any CAN traffic from vcan0::
>
> Additional procfs files in /proc/net/can::
>
> stats - SocketCAN core statistics (rx/tx frames, match ratios, ...)
> reset_stats - manual statistic reset
> - version - prints the SocketCAN core version and the ABI version
> + version - prints SocketCAN core and ABI version (removed in Linux 5.10)
>
>
> Writing Own CAN Protocol Modules
> --------------------------------
>
> @@ -1068,11 +1103,11 @@ General Settings
> .. code-block:: C
>
> dev->type = ARPHRD_CAN; /* the netdevice hardware type */
> dev->flags = IFF_NOARP; /* CAN has no arp */
>
> - dev->mtu = CAN_MTU; /* sizeof(struct can_frame) -> legacy CAN interface */
> + dev->mtu = CAN_MTU; /* sizeof(struct can_frame) -> Classical CAN interface */
>
> or alternative, when the controller supports CAN with flexible data rate:
> dev->mtu = CANFD_MTU; /* sizeof(struct canfd_frame) -> CAN FD interface */
>
> The struct can_frame or struct canfd_frame is the payload of each socket
> @@ -1182,10 +1217,11 @@ Setting CAN device properties::
> [ one-shot { on | off } ]
> [ berr-reporting { on | off } ]
> [ fd { on | off } ]
> [ fd-non-iso { on | off } ]
> [ presume-ack { on | off } ]
> + [ cc-len8-dlc { on | off } ]
>
> [ restart-ms TIME-MS ]
> [ restart ]
>
> Where: BITRATE := { 1..1000000 }
> @@ -1324,26 +1360,26 @@ CAN FD (Flexible Data Rate) Driver Support
> CAN FD capable CAN controllers support two different bitrates for the
> arbitration phase and the payload phase of the CAN FD frame. Therefore a
> second bit timing has to be specified in order to enable the CAN FD bitrate.
>
> Additionally CAN FD capable CAN controllers support up to 64 bytes of
> -payload. The representation of this length in can_frame.can_dlc and
> +payload. The representation of this length in can_frame.len and
> canfd_frame.len for userspace applications and inside the Linux network
> layer is a plain value from 0 .. 64 instead of the CAN 'data length code'.
> -The data length code was a 1:1 mapping to the payload length in the legacy
> +The data length code was a 1:1 mapping to the payload length in the Classical
> CAN frames anyway. The payload length to the bus-relevant DLC mapping is
> only performed inside the CAN drivers, preferably with the helper
> functions can_dlc2len() and can_len2dlc().
Same as above: the "1:1 mapping" part is obsolete. Now that can_dlc
has been renamed to length, no need to cover this matter in further
details. I propose to replace it by below paragraph:
+Additionally CAN FD capable CAN controllers support up to 64 bytes of
+payload. The representation of this length in can_frame.len and
+canfd_frame.len for userspace applications and inside the Linux
+network layer is a plain value from 0 .. 64.
In addition, I propose to add a sentence about the two new DLC helper
functions:
+The payload length to the bus-relevant DLC mapping is only performed
+inside the CAN drivers, preferably with the helper functions
+can_dlc2len() and can_len2dlc(). If the controller handles Classical
+CAN frames with DLC greater than 8, helper functions
+can_get_len8_dlc() and can_get_cc_dlc() can be used to respectively
+fill the len8_dlc fill during reception and get the DLC value during
>
> The CAN netdevice driver capabilities can be distinguished by the network
> devices maximum transfer unit (MTU)::
>
> - MTU = 16 (CAN_MTU) => sizeof(struct can_frame) => 'legacy' CAN device
> + MTU = 16 (CAN_MTU) => sizeof(struct can_frame) => Classical CAN device
> MTU = 72 (CANFD_MTU) => sizeof(struct canfd_frame) => CAN FD capable device
>
> The CAN device MTU can be retrieved e.g. with a SIOCGIFMTU ioctl() syscall.
> -N.B. CAN FD capable devices can also handle and send legacy CAN frames.
> +N.B. CAN FD capable devices can also handle and send Classical CAN frames.
>
> When configuring CAN FD capable CAN controllers an additional 'data' bitrate
> has to be set. This bitrate for the data phase of the CAN FD frame has to be
> at least the bitrate which was configured for the arbitration phase. This
> second bitrate is specified analogue to the first bitrate but the bitrate
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [PATCH v4 4/7] can: replace can_dlc as variable/element for payload length
2020-11-09 12:59 ` Vincent MAILHOL
@ 2020-11-09 15:38 ` Oliver Hartkopp
0 siblings, 0 replies; 13+ messages in thread
From: Oliver Hartkopp @ 2020-11-09 15:38 UTC (permalink / raw)
To: Vincent MAILHOL; +Cc: linux-can, Marc Kleine-Budde, netdev
Hi Vincent,
On 09.11.20 13:59, Vincent MAILHOL wrote:
> On Mon. 9 Nov 2020 at 19:26, Oliver Hartkopp wrote:
>> diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
>> index b2e8df8e4cb0..72671184a7a2 100644
>> --- a/include/linux/can/dev.h
>> +++ b/include/linux/can/dev.h
>> @@ -183,12 +183,12 @@ static inline void can_set_static_ctrlmode(struct net_device *dev,
>> /* override MTU which was set by default in can_setup()? */
>> if (static_mode & CAN_CTRLMODE_FD)
>> dev->mtu = CANFD_MTU;
>> }
>>
>> -/* get data length from can_dlc with sanitized can_dlc */
>> -u8 can_dlc2len(u8 can_dlc);
>> +/* get data length from raw data length code (DLC) */
>
> /*
> * convert a given data length code (dlc) of an FD CAN frame into a
> * valid data length of max. 64 bytes.
> */
>
> I missed this point during my previous review: the can_dlc2len() function
> is only valid for CAN FD frames. Comments should reflect this fact.
>
>> +u8 can_dlc2len(u8 dlc);
>
> Concerning the name:
> * can_get_cc_len() converts a Classical CAN frame DLC into a data
> length.
> * can_dlc2len() converts an FD CAN frame DLC into a data length.
>
> Just realized that both macro/function do similar things so we could
> think of a similar naming as well.
> * Example 1: can_get_cc_len() and can_get_fd_len()
> * Example 2: can_cc_dlc2len() and can_fd_dlc2len()
I like!
Patch set v5 is out now.
Thanks,
Oliver
>
> Or we could simply leave things as they are, this is not a big issue
> as long as the comments clearly state which one is for classical
> frames and which one is for FD frames.
>
>>
>> /* map the sanitized data length to an appropriate data length code */
>> u8 can_len2dlc(u8 len);
>
> can_len2dlc() might be renamed (e.g. can_get_fd_dlc()) if Example 1
> solution is chosen.
>
>> struct net_device *alloc_candev_mqs(int sizeof_priv, unsigned int echo_skb_max,
>
> Yours sincerely,
> Vincent Mailhol
>
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [PATCH v4 5/7] can: update documentation for DLC usage in Classical CAN
2020-11-09 14:50 ` Vincent MAILHOL
@ 2020-11-09 15:51 ` Oliver Hartkopp
0 siblings, 0 replies; 13+ messages in thread
From: Oliver Hartkopp @ 2020-11-09 15:51 UTC (permalink / raw)
To: Vincent MAILHOL; +Cc: linux-can, Marc Kleine-Budde, netdev
On 09.11.20 15:50, Vincent MAILHOL wrote:
> On Mon. 9 Nov 2020 at 19:26, Oliver Hartkopp wrote:
>>
>> The extension of struct can_frame with the len8_dlc element and the
>> can_dlc naming issue required an update of the documentation.
>>
>> Additionally introduce the term 'Classical CAN' which has been established
>> by CAN in Automation to separate the original CAN2.0 A/B from CAN FD.
>>
>> Updated some data structures and flags.
>>
>> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
>> ---
>> Documentation/networking/can.rst | 68 ++++++++++++++++++++++++--------
>> 1 file changed, 52 insertions(+), 16 deletions(-)
>>
>> diff --git a/Documentation/networking/can.rst b/Documentation/networking/can.rst
>> index ff05cbd05e0d..e17c6427bb3a 100644
>> --- a/Documentation/networking/can.rst
>> +++ b/Documentation/networking/can.rst
>> @@ -226,24 +226,40 @@ interface (which is different from TCP/IP due to different addressing
>> the socket, you can read(2) and write(2) from/to the socket or use
>> send(2), sendto(2), sendmsg(2) and the recv* counterpart operations
>> on the socket as usual. There are also CAN specific socket options
>> described below.
>>
>> -The basic CAN frame structure and the sockaddr structure are defined
>> -in include/linux/can.h:
>> +The Classical CAN frame structure (aka CAN 2.0B), the CAN FD frame structure
>> +and the sockaddr structure are defined in include/linux/can.h:
>>
>> .. code-block:: C
>>
>> struct can_frame {
>> canid_t can_id; /* 32 bit CAN_ID + EFF/RTR/ERR flags */
>> - __u8 can_dlc; /* frame payload length in byte (0 .. 8) */
>> + union {
>> + /* CAN frame payload length in byte (0 .. CAN_MAX_DLEN)
>> + * was previously named can_dlc so we need to carry that
>> + * name for legacy support
>> + */
>> + __u8 len;
>> + __u8 can_dlc; /* deprecated */
>> + };
>> __u8 __pad; /* padding */
>> __u8 __res0; /* reserved / padding */
>> - __u8 __res1; /* reserved / padding */
>> + __u8 len8_dlc; /* optional DLC for 8 byte payload length (9 .. 15) */
>> __u8 data[8] __attribute__((aligned(8)));
>> };
>>
>> +Remark: The len element contains the payload length in bytes and should be
>> +used instead of can_dlc. The deprecated can_dlc was misleadingly named as
>> +it always contained the plain payload length in bytes and not the so called
>> +'data length code' (DLC).
>> +
>> +To pass the raw DLC from/to a Classical CAN network device the len8_dlc
>> +element can contain values 9 .. 15 when the len element is 8 (the real
>> +payload length for all DLC values greater or equal to 8).
>
> The "Classical CAN network device" part could make the reader
> misunderstand that FD capable controllers can not handle Classical CAN
> frames with DLC greater than 8. All the CAN-FD controllers I am aware
> of can emit both Classical and FD frames. On the contrary, some
> Classical CAN controllers might not support sending DLCs greater than
> 8. Propose to add the nuance that this depends on the device property:
>
> +To pass the raw DLC from/to a capable network device
> +(c.f. cc-len8-dlc CAN device property), the len8_dlc element can
> +contain values 9 .. 15 when the len element is 8 (the real payload
> +length for all DLC values greater or equal to 8).
>
This section only describes the Classical CAN data structure. I also
thought about it - but I did not want to overload it with device properties.
>> +
>> The alignment of the (linear) payload data[] to a 64bit boundary
>> allows the user to define their own structs and unions to easily access
>> the CAN payload. There is no given byteorder on the CAN bus by
>> default. A read(2) system call on a CAN_RAW socket transfers a
>> struct can_frame to the user space.
>> @@ -258,10 +274,27 @@ PF_PACKET socket, that also binds to a specific interface:
>> int can_ifindex;
>> union {
>> /* transport protocol class address info (e.g. ISOTP) */
>> struct { canid_t rx_id, tx_id; } tp;
>>
>> + /* J1939 address information */
>> + struct {
>> + /* 8 byte name when using dynamic addressing */
>> + __u64 name;
>> +
>> + /* pgn:
>> + * 8 bit: PS in PDU2 case, else 0
>> + * 8 bit: PF
>> + * 1 bit: DP
>> + * 1 bit: reserved
>> + */
>> + __u32 pgn;
>> +
>> + /* 1 byte address */
>> + __u8 addr;
>> + } j1939;
>> +
>> /* reserved for future CAN protocols address information */
>> } can_addr;
>> };
>
> This looks like some J1939 code. Did you mix your patches?
>
This belongs to "update data structures" in the commit message ;-)
>> To determine the interface index an appropriate ioctl() has to
>> @@ -369,11 +402,11 @@ bitrates for the arbitration phase and the payload phase of the CAN FD frame
>> and up to 64 bytes of payload. This extended payload length breaks all the
>> kernel interfaces (ABI) which heavily rely on the CAN frame with fixed eight
>> bytes of payload (struct can_frame) like the CAN_RAW socket. Therefore e.g.
>> the CAN_RAW socket supports a new socket option CAN_RAW_FD_FRAMES that
>> switches the socket into a mode that allows the handling of CAN FD frames
>> -and (legacy) CAN frames simultaneously (see :ref:`socketcan-rawfd`).
>> +and Classical CAN frames simultaneously (see :ref:`socketcan-rawfd`).
>>
>> The struct canfd_frame is defined in include/linux/can.h:
>>
>> .. code-block:: C
>>
>> @@ -395,21 +428,21 @@ all structure elements can be used as-is - only the data[] becomes extended.
>
> In below paragraph, needs to add an exception for can_frame.len8_dlc:
>
> The struct canfd_frame and the existing struct can_frame have the can_id,
> the payload length and the payload data at the same offset inside their
> structures. This allows to handle the different structures very similar.
> When the content of a struct can_frame is copied into a struct canfd_frame
> -all structure elements can be used as-is - only the data[] becomes extended.
> +all structure elements (except the len8_dlc field) can be used as-is and the
> +data[] becomes extended.
>
This section tells about the mapping of "the can_id, the payload length
and the payload data"
Intentionally nothing about flags and len8_dlc.
>> When introducing the struct canfd_frame it turned out that the data length
>> code (DLC) of the struct can_frame was used as a length information as the
>> length and the DLC has a 1:1 mapping in the range of 0 .. 8. To preserve
>> the easy handling of the length information the canfd_frame.len element
>> contains a plain length value from 0 .. 64. So both canfd_frame.len and
>> -can_frame.can_dlc are equal and contain a length information and no DLC.
>> +can_frame.len are equal and contain a length information and no DLC.
>> For details about the distinction of CAN and CAN FD capable devices and
>> the mapping to the bus-relevant data length code (DLC), see :ref:`socketcan-can-fd-driver`.
>
> Now that the field has been renamed, the "1:1 mapping" explanation
> becomes obsolete. I propose to drastically reduce the paragraph:
>
I would suggest to send a patch when the patch set has been applied. The
process is slightly wrong, when you dictate your suggestions and I
re-post version by version.
Thanks,
Oliver
> +Despite being formerly named can_dlc, the len field of both struct
> +can_frame and struct canfd_frame are equal and contain a plain length
> +value from 0 .. 64; no DLC. For details about the distinction of CAN
> +and CAN FD capable devices and the mapping to the bus-relevant data
> +length code (DLC), see :ref:`socketcan-can-fd-driver`.
>
>> The length of the two CAN(FD) frame structures define the maximum transfer
>> unit (MTU) of the CAN(FD) network interface and skbuff data length. Two
>> definitions are specified for CAN specific MTUs in include/linux/can.h:
>>
>> .. code-block:: C
>>
>> - #define CAN_MTU (sizeof(struct can_frame)) == 16 => 'legacy' CAN frame
>> + #define CAN_MTU (sizeof(struct can_frame)) == 16 => Classical CAN frame
>> #define CANFD_MTU (sizeof(struct canfd_frame)) == 72 => CAN FD frame
>>
>>
>> .. _socketcan-raw-sockets:
>>
>> @@ -607,11 +640,11 @@ Example:
>>
>> if (nbytes == CANFD_MTU) {
>> printf("got CAN FD frame with length %d\n", cfd.len);
>> /* cfd.flags contains valid data */
>> } else if (nbytes == CAN_MTU) {
>> - printf("got legacy CAN frame with length %d\n", cfd.len);
>> + printf("got Classical CAN frame with length %d\n", cfd.len);
>> /* cfd.flags is undefined */
>> } else {
>> fprintf(stderr, "read: invalid CAN(FD) frame\n");
>> return 1;
>> }
>> @@ -621,21 +654,21 @@ Example:
>> printf("can_id: %X data length: %d data: ", cfd.can_id, cfd.len);
>> for (i = 0; i < cfd.len; i++)
>> printf("%02X ", cfd.data[i]);
>>
>> When reading with size CANFD_MTU only returns CAN_MTU bytes that have
>> -been received from the socket a legacy CAN frame has been read into the
>> +been received from the socket a Classical CAN frame has been read into the
>> provided CAN FD structure. Note that the canfd_frame.flags data field is
>> not specified in the struct can_frame and therefore it is only valid in
>> CANFD_MTU sized CAN FD frames.
>>
>> Implementation hint for new CAN applications:
>>
>> To build a CAN FD aware application use struct canfd_frame as basic CAN
>> data structure for CAN_RAW based applications. When the application is
>> executed on an older Linux kernel and switching the CAN_RAW_FD_FRAMES
>> -socket option returns an error: No problem. You'll get legacy CAN frames
>> +socket option returns an error: No problem. You'll get Classical CAN frames
>> or CAN FD frames and can process them the same way.
>>
>> When sending to CAN devices make sure that the device is capable to handle
>> CAN FD frames by checking if the device maximum transfer unit is CANFD_MTU.
>> The CAN device MTU can be retrieved e.g. with a SIOCGIFMTU ioctl() syscall.
>> @@ -840,10 +873,12 @@ TX_RESET_MULTI_IDX:
>> Reset the index for the multiple frame transmission.
>>
>> RX_RTR_FRAME:
>> Send reply for RTR-request (placed in op->frames[0]).
>>
>> +CAN_FD_FRAME:
>> + The CAN frames following the bcm_msg_head are struct canfd_frame's
>>
>> Broadcast Manager Transmission Timers
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>> Periodic transmission configurations may use up to two interval timers.
>> @@ -1024,11 +1059,11 @@ In this example an application requests any CAN traffic from vcan0::
>>
>> Additional procfs files in /proc/net/can::
>>
>> stats - SocketCAN core statistics (rx/tx frames, match ratios, ...)
>> reset_stats - manual statistic reset
>> - version - prints the SocketCAN core version and the ABI version
>> + version - prints SocketCAN core and ABI version (removed in Linux 5.10)
>>
>>
>> Writing Own CAN Protocol Modules
>> --------------------------------
>>
>> @@ -1068,11 +1103,11 @@ General Settings
>> .. code-block:: C
>>
>> dev->type = ARPHRD_CAN; /* the netdevice hardware type */
>> dev->flags = IFF_NOARP; /* CAN has no arp */
>>
>> - dev->mtu = CAN_MTU; /* sizeof(struct can_frame) -> legacy CAN interface */
>> + dev->mtu = CAN_MTU; /* sizeof(struct can_frame) -> Classical CAN interface */
>>
>> or alternative, when the controller supports CAN with flexible data rate:
>> dev->mtu = CANFD_MTU; /* sizeof(struct canfd_frame) -> CAN FD interface */
>>
>> The struct can_frame or struct canfd_frame is the payload of each socket
>> @@ -1182,10 +1217,11 @@ Setting CAN device properties::
>> [ one-shot { on | off } ]
>> [ berr-reporting { on | off } ]
>> [ fd { on | off } ]
>> [ fd-non-iso { on | off } ]
>> [ presume-ack { on | off } ]
>> + [ cc-len8-dlc { on | off } ]
>>
>> [ restart-ms TIME-MS ]
>> [ restart ]
>>
>> Where: BITRATE := { 1..1000000 }
>> @@ -1324,26 +1360,26 @@ CAN FD (Flexible Data Rate) Driver Support
>> CAN FD capable CAN controllers support two different bitrates for the
>> arbitration phase and the payload phase of the CAN FD frame. Therefore a
>> second bit timing has to be specified in order to enable the CAN FD bitrate.
>>
>> Additionally CAN FD capable CAN controllers support up to 64 bytes of
>> -payload. The representation of this length in can_frame.can_dlc and
>> +payload. The representation of this length in can_frame.len and
>> canfd_frame.len for userspace applications and inside the Linux network
>> layer is a plain value from 0 .. 64 instead of the CAN 'data length code'.
>> -The data length code was a 1:1 mapping to the payload length in the legacy
>> +The data length code was a 1:1 mapping to the payload length in the Classical
>> CAN frames anyway. The payload length to the bus-relevant DLC mapping is
>> only performed inside the CAN drivers, preferably with the helper
>> functions can_dlc2len() and can_len2dlc().
>
> Same as above: the "1:1 mapping" part is obsolete. Now that can_dlc
> has been renamed to length, no need to cover this matter in further
> details. I propose to replace it by below paragraph:
>
> +Additionally CAN FD capable CAN controllers support up to 64 bytes of
> +payload. The representation of this length in can_frame.len and
> +canfd_frame.len for userspace applications and inside the Linux
> +network layer is a plain value from 0 .. 64.
>
> In addition, I propose to add a sentence about the two new DLC helper
> functions:
>
> +The payload length to the bus-relevant DLC mapping is only performed
> +inside the CAN drivers, preferably with the helper functions
> +can_dlc2len() and can_len2dlc(). If the controller handles Classical
> +CAN frames with DLC greater than 8, helper functions
> +can_get_len8_dlc() and can_get_cc_dlc() can be used to respectively
> +fill the len8_dlc fill during reception and get the DLC value during
>
>>
>> The CAN netdevice driver capabilities can be distinguished by the network
>> devices maximum transfer unit (MTU)::
>>
>> - MTU = 16 (CAN_MTU) => sizeof(struct can_frame) => 'legacy' CAN device
>> + MTU = 16 (CAN_MTU) => sizeof(struct can_frame) => Classical CAN device
>> MTU = 72 (CANFD_MTU) => sizeof(struct canfd_frame) => CAN FD capable device
>>
>> The CAN device MTU can be retrieved e.g. with a SIOCGIFMTU ioctl() syscall.
>> -N.B. CAN FD capable devices can also handle and send legacy CAN frames.
>> +N.B. CAN FD capable devices can also handle and send Classical CAN frames.
>>
>> When configuring CAN FD capable CAN controllers an additional 'data' bitrate
>> has to be set. This bitrate for the data phase of the CAN FD frame has to be
>> at least the bitrate which was configured for the arbitration phase. This
>> second bitrate is specified analogue to the first bitrate but the bitrate
^ permalink raw reply [flat|nested] 13+ messages in thread
end of thread, other threads:[~2020-11-09 15:52 UTC | newest]
Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-11-09 10:26 [PATCH v4 0/7] Introduce optional DLC element for Classic CAN Oliver Hartkopp
2020-11-09 10:26 ` [PATCH v4 1/7] can: add optional DLC element to Classical CAN frame structure Oliver Hartkopp
2020-11-09 10:26 ` [PATCH v4 2/7] can: rename get_can_dlc() macro with can_get_cc_len() Oliver Hartkopp
2020-11-09 10:26 ` [PATCH v4 3/7] can: remove obsolete get_canfd_dlc() macro Oliver Hartkopp
2020-11-09 10:26 ` [PATCH v4 4/7] can: replace can_dlc as variable/element for payload length Oliver Hartkopp
2020-11-09 12:59 ` Vincent MAILHOL
2020-11-09 15:38 ` Oliver Hartkopp
2020-11-09 10:26 ` [PATCH v4 5/7] can: update documentation for DLC usage in Classical CAN Oliver Hartkopp
2020-11-09 14:50 ` Vincent MAILHOL
2020-11-09 15:51 ` Oliver Hartkopp
2020-11-09 10:26 ` [PATCH v4 6/7] can-dev: introduce helpers to access Classical CAN DLC values Oliver Hartkopp
2020-11-09 10:26 ` [PATCH v4 7/7] can-dev: add len8_dlc support for various CAN USB adapters Oliver Hartkopp
2020-11-09 11:51 ` [PATCH v4 0/7] Introduce optional DLC element for Classic CAN Oliver Hartkopp
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).