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* [PATCH net-next v3 0/3] net: qualcomm: rmnet: Enable Mapv5
@ 2021-02-23 20:02 Sharath Chandra Vurukala
  2021-02-23 20:02 ` [PATCH net-next v3 1/3] docs: networking: Add documentation for MAPv5 Sharath Chandra Vurukala
                   ` (2 more replies)
  0 siblings, 3 replies; 6+ messages in thread
From: Sharath Chandra Vurukala @ 2021-02-23 20:02 UTC (permalink / raw)
  To: davem, kuba, elder, cpratapa, subashab, netdev, linux-kernel
  Cc: Sharath Chandra Vurukala

This series introduces the MAPv5 packet format.

Patch 0 documents the MAPv5.
Patch 1 introduces the Mapv5 and the Inline checksum offload for RX.
Patch 2 introduces the Mapv5 and the Inline checksum offload for TX.

A new checksum header format is used as part of MAPv5.
For RX checksum offload, the checksum is verified by the HW and the
validity is marked in the checksum header of MAPv5.
for TX, the required metadata is filled up so hardware can compute the
checksum.

v1->v2:
- Fixed the compilation errors, warnings reported by kernel test robot.
- Checksum header definition is expanded to support big, little endian
	formats as mentioned by Jakub.

v2->v3:
- Fixed compilation errors reported by kernel bot for big endian flavor.

Sharath Chandra Vurukala (3):
  docs: networking: Add documentation for MAPv5
  net: ethernet: rmnet: Support for downlink MAPv5 checksum offload
  net: ethernet: rmnet: Add support for Mapv5 uplink packet

 .../device_drivers/cellular/qualcomm/rmnet.rst     |  53 ++++++-
 drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h |   4 +-
 .../net/ethernet/qualcomm/rmnet/rmnet_handlers.c   |  34 +++--
 drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h    |  22 ++-
 .../net/ethernet/qualcomm/rmnet/rmnet_map_data.c   | 153 ++++++++++++++++++++-
 include/linux/if_rmnet.h                           |  24 +++-
 include/uapi/linux/if_link.h                       |   2 +
 7 files changed, 263 insertions(+), 29 deletions(-)

-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


^ permalink raw reply	[flat|nested] 6+ messages in thread

* [PATCH net-next v3 1/3] docs: networking: Add documentation for MAPv5
  2021-02-23 20:02 [PATCH net-next v3 0/3] net: qualcomm: rmnet: Enable Mapv5 Sharath Chandra Vurukala
@ 2021-02-23 20:02 ` Sharath Chandra Vurukala
  2021-02-23 20:02 ` [PATCH net-next v3 2/3] net: ethernet: rmnet: Support for downlink MAPv5 checksum offload Sharath Chandra Vurukala
  2021-02-23 20:02 ` [PATCH net-next v3 3/3] net: ethernet: rmnet: Add support for Mapv5 uplink packet Sharath Chandra Vurukala
  2 siblings, 0 replies; 6+ messages in thread
From: Sharath Chandra Vurukala @ 2021-02-23 20:02 UTC (permalink / raw)
  To: davem, kuba, elder, cpratapa, subashab, netdev, linux-kernel
  Cc: Sharath Chandra Vurukala

Adding documentation explaining the new MAPv5 packet format
and the corresponding checksum offload header.

Signed-off-by: Sharath Chandra Vurukala <sharathv@codeaurora.org>
---
 .../device_drivers/cellular/qualcomm/rmnet.rst     | 53 ++++++++++++++++++++--
 1 file changed, 49 insertions(+), 4 deletions(-)

diff --git a/Documentation/networking/device_drivers/cellular/qualcomm/rmnet.rst b/Documentation/networking/device_drivers/cellular/qualcomm/rmnet.rst
index 70643b5..8c81f19 100644
--- a/Documentation/networking/device_drivers/cellular/qualcomm/rmnet.rst
+++ b/Documentation/networking/device_drivers/cellular/qualcomm/rmnet.rst
@@ -27,7 +27,7 @@ these MAP frames and send them to appropriate PDN's.
 2. Packet format
 ================
 
-a. MAP packet (data / control)
+a. MAP packet v1 (data / control)
 
 MAP header has the same endianness of the IP packet.
 
@@ -35,8 +35,9 @@ Packet format::
 
   Bit             0             1           2-7      8 - 15           16 - 31
   Function   Command / Data   Reserved     Pad   Multiplexer ID    Payload length
-  Bit            32 - x
-  Function     Raw  Bytes
+
+  Bit            32-x
+  Function      Raw bytes
 
 Command (1)/ Data (0) bit value is to indicate if the packet is a MAP command
 or data packet. Control packet is used for transport level flow control. Data
@@ -52,7 +53,51 @@ Multiplexer ID is to indicate the PDN on which data has to be sent.
 Payload length includes the padding length but does not include MAP header
 length.
 
-b. MAP packet (command specific)::
+b. MAP packet v5 (data / control)
+
+MAP header has the same endianness of the IP packet.
+
+Packet format::
+
+  Bit             0             1         2-7      8 - 15           16 - 31
+  Function   Command / Data  Next Header  Pad   Multiplexer ID   Payload length
+
+  Bit            32 - 38        1               40              41-63
+  Function     Header Type    Next Header     Checksum Valid    Reserved
+
+  Bit            64-x
+  Function      Raw bytes
+
+Command (1)/ Data (0) bit value is to indicate if the packet is a MAP command
+or data packet. Control packet is used for transport level flow control. Data
+packets are standard IP packets.
+
+Next header is used to indicate the presence of another header, currently is
+limited to checksum header.
+
+Padding is number of bytes to be added for 4 byte alignment if required by
+hardware.
+
+Multiplexer ID is to indicate the PDN on which data has to be sent.
+
+Payload length includes the padding length but does not include MAP header
+length.
+
+Header Type is to indicate the type of header, this usually is set to CHECKSUM
+
+Header types
+= ==========================================
+0 Reserved
+1 Reserved
+2 checksum header
+
+Checksum Valid is to indicate whether the header checksum is valid. Value of 1
+implies that checksum is calculated on this packet and is valid, value of 0
+indicates that the calculated packet checksum is invalid.
+
+Reserved bits are usually zeroed out and to be ignored by receiver.
+
+c. MAP packet v1/v5 (command specific)::
 
     Bit             0             1           2-7      8 - 15           16 - 31
     Function   Command         Reserved     Pad   Multiplexer ID    Payload length
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


^ permalink raw reply	[flat|nested] 6+ messages in thread

* [PATCH net-next v3 2/3] net: ethernet: rmnet: Support for downlink MAPv5 checksum offload
  2021-02-23 20:02 [PATCH net-next v3 0/3] net: qualcomm: rmnet: Enable Mapv5 Sharath Chandra Vurukala
  2021-02-23 20:02 ` [PATCH net-next v3 1/3] docs: networking: Add documentation for MAPv5 Sharath Chandra Vurukala
@ 2021-02-23 20:02 ` Sharath Chandra Vurukala
  2021-02-24 18:23   ` Jakub Kicinski
  2021-02-23 20:02 ` [PATCH net-next v3 3/3] net: ethernet: rmnet: Add support for Mapv5 uplink packet Sharath Chandra Vurukala
  2 siblings, 1 reply; 6+ messages in thread
From: Sharath Chandra Vurukala @ 2021-02-23 20:02 UTC (permalink / raw)
  To: davem, kuba, elder, cpratapa, subashab, netdev, linux-kernel
  Cc: Sharath Chandra Vurukala

Adding support for processing of Mapv5 downlink packets.
It involves parsing the Mapv5 packet and checking the csum header
to know whether the hardware has validated the checksum and is
valid or not.

Based on the checksum valid bit the corresponding stats are
incremented and skb->ip_summed is marked either CHECKSUM_UNNECESSARY
or left as CHEKSUM_NONE to let network stack revalidated the checksum
and update the respective snmp stats.

Current MapV1 header has been modified, the reserved field in the
Mapv1 header is now used for next header indication.

Signed-off-by: Sharath Chandra Vurukala <sharathv@codeaurora.org>
---
 .../net/ethernet/qualcomm/rmnet/rmnet_handlers.c   | 19 ++++---
 drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h    | 14 ++++-
 .../net/ethernet/qualcomm/rmnet/rmnet_map_data.c   | 60 +++++++++++++++++++++-
 include/linux/if_rmnet.h                           | 24 +++++++--
 include/uapi/linux/if_link.h                       |  1 +
 5 files changed, 106 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
index 3d7d3ab..70ad6a7 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2013-2018, 2021, The Linux Foundation. All rights reserved.
  *
  * RMNET Data ingress/egress handler
  */
@@ -57,8 +57,8 @@ __rmnet_map_ingress_handler(struct sk_buff *skb,
 			    struct rmnet_port *port)
 {
 	struct rmnet_endpoint *ep;
+	u8 mux_id, next_hdr;
 	u16 len, pad;
-	u8 mux_id;
 
 	if (RMNET_MAP_GET_CD_BIT(skb)) {
 		if (port->data_format & RMNET_FLAGS_INGRESS_MAP_COMMANDS)
@@ -70,6 +70,7 @@ __rmnet_map_ingress_handler(struct sk_buff *skb,
 	mux_id = RMNET_MAP_GET_MUX_ID(skb);
 	pad = RMNET_MAP_GET_PAD(skb);
 	len = RMNET_MAP_GET_LENGTH(skb) - pad;
+	next_hdr = RMNET_MAP_GET_NH_BIT(skb);
 
 	if (mux_id >= RMNET_MAX_LOGICAL_EP)
 		goto free_skb;
@@ -80,15 +81,19 @@ __rmnet_map_ingress_handler(struct sk_buff *skb,
 
 	skb->dev = ep->egress_dev;
 
-	/* Subtract MAP header */
-	skb_pull(skb, sizeof(struct rmnet_map_header));
-	rmnet_set_skb_proto(skb);
-
-	if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4) {
+	if (next_hdr &&
+	    (port->data_format & (RMNET_FLAGS_INGRESS_MAP_CKSUMV5))) {
+		if (rmnet_map_process_next_hdr_packet(skb, len))
+			goto free_skb;
+	} else if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4) {
 		if (!rmnet_map_checksum_downlink_packet(skb, len + pad))
 			skb->ip_summed = CHECKSUM_UNNECESSARY;
 	}
 
+	/* Subtract MAP header */
+	skb_pull(skb, sizeof(struct rmnet_map_header));
+	rmnet_set_skb_proto(skb);
+
 	skb_trim(skb, len);
 	rmnet_deliver_skb(skb);
 	return;
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
index 576501d..2ee1ce2 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
@@ -1,5 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
-/* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2013-2018, 2021, The Linux Foundation. All rights reserved.
  */
 
 #ifndef _RMNET_MAP_H_
@@ -23,6 +23,12 @@ struct rmnet_map_control_command {
 	};
 }  __aligned(1);
 
+enum rmnet_map_v5_header_type {
+	RMNET_MAP_HEADER_TYPE_UNKNOWN,
+	RMNET_MAP_HEADER_TYPE_CSUM_OFFLOAD = 0x2,
+	RMNET_MAP_HEADER_TYPE_ENUM_LENGTH
+};
+
 enum rmnet_map_commands {
 	RMNET_MAP_COMMAND_NONE,
 	RMNET_MAP_COMMAND_FLOW_DISABLE,
@@ -44,6 +50,9 @@ enum rmnet_map_commands {
 #define RMNET_MAP_GET_LENGTH(Y) (ntohs(((struct rmnet_map_header *) \
 					(Y)->data)->pkt_len))
 
+#define RMNET_MAP_GET_NH_BIT(Y)  (((struct rmnet_map_header *) \
+				    (Y)->data)->next_hdr)
+
 #define RMNET_MAP_COMMAND_REQUEST     0
 #define RMNET_MAP_COMMAND_ACK         1
 #define RMNET_MAP_COMMAND_UNSUPPORTED 2
@@ -60,5 +69,8 @@ void rmnet_map_command(struct sk_buff *skb, struct rmnet_port *port);
 int rmnet_map_checksum_downlink_packet(struct sk_buff *skb, u16 len);
 void rmnet_map_checksum_uplink_packet(struct sk_buff *skb,
 				      struct net_device *orig_dev);
+int rmnet_map_process_next_hdr_packet(struct sk_buff *skb, u16 len);
+u8 rmnet_map_get_next_hdr_type(struct sk_buff *skb);
+bool rmnet_map_get_csum_valid(struct sk_buff *skb);
 
 #endif /* _RMNET_MAP_H_ */
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
index 21d3816..a3dc220 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2013-2018, 2021, The Linux Foundation. All rights reserved.
  *
  * RMNET Data MAP protocol
  */
@@ -311,6 +311,7 @@ struct rmnet_map_header *rmnet_map_add_map_header(struct sk_buff *skb,
 struct sk_buff *rmnet_map_deaggregate(struct sk_buff *skb,
 				      struct rmnet_port *port)
 {
+	unsigned char *data = skb->data, *next_hdr = NULL;
 	struct rmnet_map_header *maph;
 	struct sk_buff *skbn;
 	u32 packet_len;
@@ -323,6 +324,12 @@ struct sk_buff *rmnet_map_deaggregate(struct sk_buff *skb,
 
 	if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4)
 		packet_len += sizeof(struct rmnet_map_dl_csum_trailer);
+	else if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV5) {
+		if (!maph->cd_bit) {
+			packet_len += sizeof(struct rmnet_map_v5_csum_header);
+			next_hdr = data + sizeof(*maph);
+		}
+	}
 
 	if (((int)skb->len - (int)packet_len) < 0)
 		return NULL;
@@ -331,6 +338,11 @@ struct sk_buff *rmnet_map_deaggregate(struct sk_buff *skb,
 	if (ntohs(maph->pkt_len) == 0)
 		return NULL;
 
+	if (next_hdr &&
+	    ((struct rmnet_map_v5_csum_header *)next_hdr)->header_type !=
+	     RMNET_MAP_HEADER_TYPE_CSUM_OFFLOAD)
+		return NULL;
+
 	skbn = alloc_skb(packet_len + RMNET_MAP_DEAGGR_SPACING, GFP_ATOMIC);
 	if (!skbn)
 		return NULL;
@@ -428,3 +440,49 @@ void rmnet_map_checksum_uplink_packet(struct sk_buff *skb,
 
 	priv->stats.csum_sw++;
 }
+
+u8 rmnet_map_get_next_hdr_type(struct sk_buff *skb)
+{
+	unsigned char *data = skb->data;
+
+	data += sizeof(struct rmnet_map_header);
+	return ((struct rmnet_map_v5_csum_header *)data)->header_type;
+}
+
+bool rmnet_map_get_csum_valid(struct sk_buff *skb)
+{
+	unsigned char *data = skb->data;
+
+	data += sizeof(struct rmnet_map_header);
+	return ((struct rmnet_map_v5_csum_header *)data)->csum_valid_required;
+}
+
+/* Process a MAPv5 packet header */
+int rmnet_map_process_next_hdr_packet(struct sk_buff *skb,
+				      u16 len)
+{
+	struct rmnet_priv *priv = netdev_priv(skb->dev);
+	int rc = 0;
+
+	switch (rmnet_map_get_next_hdr_type(skb)) {
+	case RMNET_MAP_HEADER_TYPE_CSUM_OFFLOAD:
+		if (unlikely(!(skb->dev->features & NETIF_F_RXCSUM))) {
+			priv->stats.csum_sw++;
+		} else if (rmnet_map_get_csum_valid(skb)) {
+			priv->stats.csum_ok++;
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+		} else {
+			priv->stats.csum_valid_unset++;
+		}
+
+		/* Pull csum v5 header */
+		skb_pull(skb, sizeof(struct rmnet_map_v5_csum_header));
+		break;
+	default:
+		rc = -EINVAL;
+		break;
+	}
+
+	return rc;
+}
+
diff --git a/include/linux/if_rmnet.h b/include/linux/if_rmnet.h
index 9661416..004773f 100644
--- a/include/linux/if_rmnet.h
+++ b/include/linux/if_rmnet.h
@@ -1,5 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0-only
- * Copyright (c) 2013-2019, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2013-2019, 2021 The Linux Foundation. All rights reserved.
  */
 
 #ifndef _LINUX_IF_RMNET_H_
@@ -8,11 +8,11 @@
 struct rmnet_map_header {
 #if defined(__LITTLE_ENDIAN_BITFIELD)
 	u8  pad_len:6;
-	u8  reserved_bit:1;
+	u8  next_hdr:1;
 	u8  cd_bit:1;
 #elif defined (__BIG_ENDIAN_BITFIELD)
 	u8  cd_bit:1;
-	u8  reserved_bit:1;
+	u8  next_hdr:1;
 	u8  pad_len:6;
 #else
 #error	"Please fix <asm/byteorder.h>"
@@ -52,4 +52,22 @@ struct rmnet_map_ul_csum_header {
 #endif
 } __aligned(1);
 
+/* MAP CSUM headers */
+struct rmnet_map_v5_csum_header {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+	u8  next_hdr:1;
+	u8  header_type:7;
+	u8  hw_reserved:7;
+	u8  csum_valid_required:1;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+	u8  header_type:7;
+	u8  next_hdr:1;
+	u8  csum_valid_required:1;
+	u8  hw_reserved:7;
+#else
+#error	"Please fix <asm/byteorder.h>"
+#endif
+	__be16 reserved;
+} __aligned(1);
+
 #endif /* !(_LINUX_IF_RMNET_H_) */
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 82708c6..838bd29 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -1233,6 +1233,7 @@ enum {
 #define RMNET_FLAGS_INGRESS_MAP_COMMANDS          (1U << 1)
 #define RMNET_FLAGS_INGRESS_MAP_CKSUMV4           (1U << 2)
 #define RMNET_FLAGS_EGRESS_MAP_CKSUMV4            (1U << 3)
+#define RMNET_FLAGS_INGRESS_MAP_CKSUMV5           (1U << 4)
 
 enum {
 	IFLA_RMNET_UNSPEC,
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


^ permalink raw reply	[flat|nested] 6+ messages in thread

* [PATCH net-next v3 3/3] net: ethernet: rmnet: Add support for Mapv5 uplink packet
  2021-02-23 20:02 [PATCH net-next v3 0/3] net: qualcomm: rmnet: Enable Mapv5 Sharath Chandra Vurukala
  2021-02-23 20:02 ` [PATCH net-next v3 1/3] docs: networking: Add documentation for MAPv5 Sharath Chandra Vurukala
  2021-02-23 20:02 ` [PATCH net-next v3 2/3] net: ethernet: rmnet: Support for downlink MAPv5 checksum offload Sharath Chandra Vurukala
@ 2021-02-23 20:02 ` Sharath Chandra Vurukala
  2 siblings, 0 replies; 6+ messages in thread
From: Sharath Chandra Vurukala @ 2021-02-23 20:02 UTC (permalink / raw)
  To: davem, kuba, elder, cpratapa, subashab, netdev, linux-kernel
  Cc: Sharath Chandra Vurukala

Adding Support for Mapv5 uplink packet.
Based on the configuration, request HW for csum offload,
by setting the csum_valid_required of Mapv5 packet.

Signed-off-by: Sharath Chandra Vurukala <sharathv@codeaurora.org>
---
 drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h |  4 +-
 .../net/ethernet/qualcomm/rmnet/rmnet_handlers.c   | 15 +++-
 drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h    |  8 +-
 .../net/ethernet/qualcomm/rmnet/rmnet_map_data.c   | 93 ++++++++++++++++++++--
 include/uapi/linux/if_link.h                       |  1 +
 5 files changed, 108 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h
index 8d8d469..8e64ca9 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h
@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
-/* Copyright (c) 2013-2014, 2016-2018 The Linux Foundation. All rights reserved.
+/* Copyright (c) 2013-2014, 2016-2018, 2021 The Linux Foundation.
+ * All rights reserved.
  *
  * RMNET Data configuration engine
  */
@@ -56,6 +57,7 @@ struct rmnet_priv_stats {
 	u64 csum_fragmented_pkt;
 	u64 csum_skipped;
 	u64 csum_sw;
+	u64 csum_hw;
 };
 
 struct rmnet_priv {
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
index 70ad6a7..e6a44cd 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
@@ -131,26 +131,33 @@ static int rmnet_map_egress_handler(struct sk_buff *skb,
 				    struct rmnet_port *port, u8 mux_id,
 				    struct net_device *orig_dev)
 {
-	int required_headroom, additional_header_len;
+	int required_headroom, additional_header_len, csum_type;
 	struct rmnet_map_header *map_header;
 
+	csum_type = 0;
 	additional_header_len = 0;
 	required_headroom = sizeof(struct rmnet_map_header);
 
 	if (port->data_format & RMNET_FLAGS_EGRESS_MAP_CKSUMV4) {
 		additional_header_len = sizeof(struct rmnet_map_ul_csum_header);
 		required_headroom += additional_header_len;
+		csum_type = RMNET_FLAGS_EGRESS_MAP_CKSUMV4;
+	} else if (port->data_format & RMNET_FLAGS_EGRESS_MAP_CKSUMV5) {
+		additional_header_len = sizeof(struct rmnet_map_v5_csum_header);
+		csum_type = RMNET_FLAGS_EGRESS_MAP_CKSUMV5;
 	}
 
+	required_headroom += additional_header_len;
+
 	if (skb_headroom(skb) < required_headroom) {
 		if (pskb_expand_head(skb, required_headroom, 0, GFP_ATOMIC))
 			return -ENOMEM;
 	}
 
-	if (port->data_format & RMNET_FLAGS_EGRESS_MAP_CKSUMV4)
-		rmnet_map_checksum_uplink_packet(skb, orig_dev);
+	if (csum_type)
+		rmnet_map_checksum_uplink_packet(skb, port, orig_dev, csum_type);
 
-	map_header = rmnet_map_add_map_header(skb, additional_header_len, 0);
+	map_header = rmnet_map_add_map_header(skb, additional_header_len, port, 0);
 	if (!map_header)
 		return -ENOMEM;
 
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
index 2ee1ce2..84d108e 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
@@ -64,11 +64,15 @@ enum rmnet_map_commands {
 struct sk_buff *rmnet_map_deaggregate(struct sk_buff *skb,
 				      struct rmnet_port *port);
 struct rmnet_map_header *rmnet_map_add_map_header(struct sk_buff *skb,
-						  int hdrlen, int pad);
+						  int hdrlen,
+						  struct rmnet_port *port,
+						  int pad);
 void rmnet_map_command(struct sk_buff *skb, struct rmnet_port *port);
 int rmnet_map_checksum_downlink_packet(struct sk_buff *skb, u16 len);
 void rmnet_map_checksum_uplink_packet(struct sk_buff *skb,
-				      struct net_device *orig_dev);
+				      struct rmnet_port *port,
+				      struct net_device *orig_dev,
+				      int csum_type);
 int rmnet_map_process_next_hdr_packet(struct sk_buff *skb, u16 len);
 u8 rmnet_map_get_next_hdr_type(struct sk_buff *skb);
 bool rmnet_map_get_csum_valid(struct sk_buff *skb);
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
index a3dc220..f65bdd4 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
@@ -263,12 +263,69 @@ rmnet_map_ipv6_ul_csum_header(void *ip6hdr,
 }
 #endif
 
+static void rmnet_map_v5_checksum_uplink_packet(struct sk_buff *skb,
+						struct rmnet_port *port,
+						struct net_device *orig_dev)
+{
+	struct rmnet_priv *priv = netdev_priv(orig_dev);
+	struct rmnet_map_v5_csum_header *ul_header;
+
+	if (!(port->data_format & RMNET_FLAGS_EGRESS_MAP_CKSUMV5))
+		return;
+
+	ul_header = (struct rmnet_map_v5_csum_header *)
+		    skb_push(skb, sizeof(*ul_header));
+	memset(ul_header, 0, sizeof(*ul_header));
+	ul_header->header_type = RMNET_MAP_HEADER_TYPE_CSUM_OFFLOAD;
+
+	if (skb->ip_summed == CHECKSUM_PARTIAL) {
+		void *iph = (char *)ul_header + sizeof(*ul_header);
+		__sum16 *check;
+		void *trans;
+		u8 proto;
+
+		if (skb->protocol == htons(ETH_P_IP)) {
+			u16 ip_len = ((struct iphdr *)iph)->ihl * 4;
+
+			proto = ((struct iphdr *)iph)->protocol;
+			trans = iph + ip_len;
+		} else if (skb->protocol == htons(ETH_P_IPV6)) {
+#if IS_ENABLED(CONFIG_IPV6)
+			u16 ip_len = sizeof(struct ipv6hdr);
+
+			proto = ((struct ipv6hdr *)iph)->nexthdr;
+			trans = iph + ip_len;
+#else
+			priv->stats.csum_err_invalid_ip_version++;
+			goto sw_csum;
+#endif /* CONFIG_IPV6 */
+		} else {
+			priv->stats.csum_err_invalid_ip_version++;
+			goto sw_csum;
+		}
+
+		check = rmnet_map_get_csum_field(proto, trans);
+		if (check) {
+			skb->ip_summed = CHECKSUM_NONE;
+			/* Ask for checksum offloading */
+			ul_header->csum_valid_required = 1;
+			priv->stats.csum_hw++;
+			return;
+		}
+	}
+
+sw_csum:
+	priv->stats.csum_sw++;
+}
+
 /* Adds MAP header to front of skb->data
  * Padding is calculated and set appropriately in MAP header. Mux ID is
  * initialized to 0.
  */
 struct rmnet_map_header *rmnet_map_add_map_header(struct sk_buff *skb,
-						  int hdrlen, int pad)
+						  int hdrlen,
+						  struct rmnet_port *port,
+						  int pad)
 {
 	struct rmnet_map_header *map_header;
 	u32 padding, map_datalen;
@@ -279,6 +336,11 @@ struct rmnet_map_header *rmnet_map_add_map_header(struct sk_buff *skb,
 			skb_push(skb, sizeof(struct rmnet_map_header));
 	memset(map_header, 0, sizeof(struct rmnet_map_header));
 
+	/* Set next_hdr bit for csum offload packets */
+	if (port->data_format & RMNET_FLAGS_EGRESS_MAP_CKSUMV5) {
+		map_header->next_hdr = 1;
+	}
+
 	if (pad == RMNET_MAP_NO_PAD_BYTES) {
 		map_header->pkt_len = htons(map_datalen);
 		return map_header;
@@ -395,11 +457,8 @@ int rmnet_map_checksum_downlink_packet(struct sk_buff *skb, u16 len)
 	return 0;
 }
 
-/* Generates UL checksum meta info header for IPv4 and IPv6 over TCP and UDP
- * packets that are supported for UL checksum offload.
- */
-void rmnet_map_checksum_uplink_packet(struct sk_buff *skb,
-				      struct net_device *orig_dev)
+static void rmnet_map_v4_checksum_uplink_packet(struct sk_buff *skb,
+						struct net_device *orig_dev)
 {
 	struct rmnet_priv *priv = netdev_priv(orig_dev);
 	struct rmnet_map_ul_csum_header *ul_header;
@@ -418,10 +477,12 @@ void rmnet_map_checksum_uplink_packet(struct sk_buff *skb,
 
 		if (skb->protocol == htons(ETH_P_IP)) {
 			rmnet_map_ipv4_ul_csum_header(iphdr, ul_header, skb);
+			priv->stats.csum_hw++;
 			return;
 		} else if (skb->protocol == htons(ETH_P_IPV6)) {
 #if IS_ENABLED(CONFIG_IPV6)
 			rmnet_map_ipv6_ul_csum_header(iphdr, ul_header, skb);
+			priv->stats.csum_hw++;
 			return;
 #else
 			priv->stats.csum_err_invalid_ip_version++;
@@ -457,6 +518,26 @@ bool rmnet_map_get_csum_valid(struct sk_buff *skb)
 	return ((struct rmnet_map_v5_csum_header *)data)->csum_valid_required;
 }
 
+/* Generates UL checksum meta info header for IPv4 and IPv6 over TCP and UDP
+ * packets that are supported for UL checksum offload.
+ */
+void rmnet_map_checksum_uplink_packet(struct sk_buff *skb,
+				      struct rmnet_port *port,
+				      struct net_device *orig_dev,
+				      int csum_type)
+{
+	switch (csum_type) {
+	case RMNET_FLAGS_EGRESS_MAP_CKSUMV4:
+		rmnet_map_v4_checksum_uplink_packet(skb, orig_dev);
+		break;
+	case RMNET_FLAGS_EGRESS_MAP_CKSUMV5:
+		rmnet_map_v5_checksum_uplink_packet(skb, port, orig_dev);
+		break;
+	default:
+		break;
+	}
+}
+
 /* Process a MAPv5 packet header */
 int rmnet_map_process_next_hdr_packet(struct sk_buff *skb,
 				      u16 len)
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 838bd29..319865f 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -1234,6 +1234,7 @@ enum {
 #define RMNET_FLAGS_INGRESS_MAP_CKSUMV4           (1U << 2)
 #define RMNET_FLAGS_EGRESS_MAP_CKSUMV4            (1U << 3)
 #define RMNET_FLAGS_INGRESS_MAP_CKSUMV5           (1U << 4)
+#define RMNET_FLAGS_EGRESS_MAP_CKSUMV5            (1U << 5)
 
 enum {
 	IFLA_RMNET_UNSPEC,
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH net-next v3 2/3] net: ethernet: rmnet: Support for downlink MAPv5 checksum offload
  2021-02-23 20:02 ` [PATCH net-next v3 2/3] net: ethernet: rmnet: Support for downlink MAPv5 checksum offload Sharath Chandra Vurukala
@ 2021-02-24 18:23   ` Jakub Kicinski
  2021-02-25 15:29     ` Alex Elder
  0 siblings, 1 reply; 6+ messages in thread
From: Jakub Kicinski @ 2021-02-24 18:23 UTC (permalink / raw)
  To: Sharath Chandra Vurukala
  Cc: davem, elder, cpratapa, subashab, netdev, linux-kernel

On Wed, 24 Feb 2021 01:32:50 +0530 Sharath Chandra Vurukala wrote:
> +/* MAP CSUM headers */
> +struct rmnet_map_v5_csum_header {
> +#if defined(__LITTLE_ENDIAN_BITFIELD)
> +	u8  next_hdr:1;
> +	u8  header_type:7;
> +	u8  hw_reserved:7;
> +	u8  csum_valid_required:1;
> +#elif defined(__BIG_ENDIAN_BITFIELD)
> +	u8  header_type:7;
> +	u8  next_hdr:1;
> +	u8  csum_valid_required:1;
> +	u8  hw_reserved:7;
> +#else
> +#error	"Please fix <asm/byteorder.h>"
> +#endif
> +	__be16 reserved;
> +} __aligned(1);

This seems to be your first contribution so let me spell it out.

In Linux when maintainers ask you to do something you are expected 
to do it.

You can leave the existing bitfields for later, but don't add another.

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH net-next v3 2/3] net: ethernet: rmnet: Support for downlink MAPv5 checksum offload
  2021-02-24 18:23   ` Jakub Kicinski
@ 2021-02-25 15:29     ` Alex Elder
  0 siblings, 0 replies; 6+ messages in thread
From: Alex Elder @ 2021-02-25 15:29 UTC (permalink / raw)
  To: Jakub Kicinski, Sharath Chandra Vurukala
  Cc: davem, elder, cpratapa, subashab, netdev, linux-kernel

On 2/24/21 12:23 PM, Jakub Kicinski wrote:
> On Wed, 24 Feb 2021 01:32:50 +0530 Sharath Chandra Vurukala wrote:
>> +/* MAP CSUM headers */
>> +struct rmnet_map_v5_csum_header {
>> +#if defined(__LITTLE_ENDIAN_BITFIELD)
>> +	u8  next_hdr:1;
>> +	u8  header_type:7;
>> +	u8  hw_reserved:7;
>> +	u8  csum_valid_required:1;
>> +#elif defined(__BIG_ENDIAN_BITFIELD)
>> +	u8  header_type:7;
>> +	u8  next_hdr:1;
>> +	u8  csum_valid_required:1;
>> +	u8  hw_reserved:7;
>> +#else
>> +#error	"Please fix <asm/byteorder.h>"
>> +#endif
>> +	__be16 reserved;
>> +} __aligned(1);
> 
> This seems to be your first contribution so let me spell it out.
> 
> In Linux when maintainers ask you to do something you are expected
> to do it.
> 
> You can leave the existing bitfields for later, but don't add another.

As I offered, I will implement changes to the existing
code to use masks in place of these C bit-fields.

I will try complete this within the next week.  If it
looks good it could serve as an example of how to go
about it.

					-Alex

^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, back to index

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-02-23 20:02 [PATCH net-next v3 0/3] net: qualcomm: rmnet: Enable Mapv5 Sharath Chandra Vurukala
2021-02-23 20:02 ` [PATCH net-next v3 1/3] docs: networking: Add documentation for MAPv5 Sharath Chandra Vurukala
2021-02-23 20:02 ` [PATCH net-next v3 2/3] net: ethernet: rmnet: Support for downlink MAPv5 checksum offload Sharath Chandra Vurukala
2021-02-24 18:23   ` Jakub Kicinski
2021-02-25 15:29     ` Alex Elder
2021-02-23 20:02 ` [PATCH net-next v3 3/3] net: ethernet: rmnet: Add support for Mapv5 uplink packet Sharath Chandra Vurukala

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