[PATCH net-next 0/7] net: ipa: a few last bits

[PATCH net-next 0/7] net: ipa: a few last bits

[Alex Elder]

This series incorporates a few last things that didn't fit neatly
with patches I've posted recently.

The first patch eliminates all remaining kernel-doc warnings.
There's still room for kernel-doc improvement, but at least what's
there will no longer produce warnings.

The next moves the definition of the value to store in the backward
compatibility register (when present) into platform data files.

The third removes two endpoint definitions that do not need to be
defined.

The next two switch the naming convention used for configuration
data files to be based on the IPA version rather than the specific
platform.  I was skeptical about this at first (i.e., I thought a
platform might have quirks separate from the IPA version).  But
I'm now convinced the IPA version is enough to define the details
of the hardware block.  If any exceptions to this are found, we can
treat those differently.  Note:  these two patches produce warnings
from checkpatch.pl about updating MAINTAINERS: these can be ignored.

The sixth removes unnecessary checks for alignment of DMA memory
allocations, based comments from David Laight.

And the last removes a symbol representing the size of a table
entry, using sizeof(__le64) in its place.

					-Alex

Alex Elder (7):
  net: ipa: fix all kernel-doc warnings
  net: ipa: store BCR register values in config data
  net: ipa: don't define endpoints unnecessarily
  net: ipa: switch to version based configuration
  net: ipa: use version based configuration for SC7180
  net: ipa: DMA addresses are nicely aligned
  net: ipa: kill IPA_TABLE_ENTRY_SIZE

 drivers/net/ipa/Kconfig                       |  3 +-
 drivers/net/ipa/Makefile                      |  2 +-
 drivers/net/ipa/gsi.c                         | 13 +--
 drivers/net/ipa/gsi_private.h                 |  4 +-
 drivers/net/ipa/gsi_trans.c                   |  9 +-
 drivers/net/ipa/gsi_trans.h                   |  5 +-
 drivers/net/ipa/ipa.h                         |  7 +-
 drivers/net/ipa/ipa_cmd.c                     |  2 +-
 drivers/net/ipa/ipa_cmd.h                     | 19 +++--
 .../{ipa_data-sdm845.c => ipa_data-v3.5.1.c}  | 39 ++++-----
 .../{ipa_data-sc7180.c => ipa_data-v4.2.c}    | 25 +++---
 drivers/net/ipa/ipa_data.h                    | 10 ++-
 drivers/net/ipa/ipa_endpoint.h                | 29 +++++--
 drivers/net/ipa/ipa_interrupt.h               |  1 +
 drivers/net/ipa/ipa_main.c                    |  8 +-
 drivers/net/ipa/ipa_mem.h                     |  2 +-
 drivers/net/ipa/ipa_qmi.c                     | 10 +--
 drivers/net/ipa/ipa_qmi.h                     | 14 ++--
 drivers/net/ipa/ipa_reg.h                     | 21 -----
 drivers/net/ipa/ipa_smp2p.h                   |  2 +-
 drivers/net/ipa/ipa_table.c                   | 83 +++++++++----------
 drivers/net/ipa/ipa_table.h                   |  6 +-
 22 files changed, 153 insertions(+), 161 deletions(-)
 rename drivers/net/ipa/{ipa_data-sdm845.c => ipa_data-v3.5.1.c} (90%)
 rename drivers/net/ipa/{ipa_data-sc7180.c => ipa_data-v4.2.c} (90%)

-- 
2.27.0

[PATCH net-next 1/7] net: ipa: fix all kernel-doc warnings

[Alex Elder]

Fix all warnings produced when running:
  scripts/kernel-doc -none drivers/net/ipa/*.[ch]

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/gsi_private.h   |  2 +-
 drivers/net/ipa/gsi_trans.h     |  5 +++--
 drivers/net/ipa/ipa.h           |  7 ++++---
 drivers/net/ipa/ipa_cmd.h       | 19 +++++++++++++------
 drivers/net/ipa/ipa_endpoint.h  | 18 +++++++++++++++---
 drivers/net/ipa/ipa_interrupt.h |  1 +
 drivers/net/ipa/ipa_mem.h       |  2 +-
 drivers/net/ipa/ipa_qmi.h       | 14 +++++++++-----
 drivers/net/ipa/ipa_smp2p.h     |  2 +-
 drivers/net/ipa/ipa_table.h     |  3 ++-
 10 files changed, 50 insertions(+), 23 deletions(-)

diff --git a/drivers/net/ipa/gsi_private.h b/drivers/net/ipa/gsi_private.h
index 1785c9d3344d1..ed7bc26f85e9a 100644
--- a/drivers/net/ipa/gsi_private.h
+++ b/drivers/net/ipa/gsi_private.h
@@ -100,7 +100,7 @@ void gsi_channel_doorbell(struct gsi_channel *channel);
 /**
  * gsi_ring_virt() - Return virtual address for a ring entry
  * @ring:	Ring whose address is to be translated
- * @addr:	Index (slot number) of entry
+ * @index:	Index (slot number) of entry
  */
 void *gsi_ring_virt(struct gsi_ring *ring, u32 index);
 
diff --git a/drivers/net/ipa/gsi_trans.h b/drivers/net/ipa/gsi_trans.h
index 3a4ab8a94d827..17fd1822d8a9f 100644
--- a/drivers/net/ipa/gsi_trans.h
+++ b/drivers/net/ipa/gsi_trans.h
@@ -71,7 +71,7 @@ struct gsi_trans {
 
 /**
  * gsi_trans_pool_init() - Initialize a pool of structures for transactions
- * @gsi:	GSI pointer
+ * @pool:	GSI transaction poll pointer
  * @size:	Size of elements in the pool
  * @count:	Minimum number of elements in the pool
  * @max_alloc:	Maximum number of elements allocated at a time from pool
@@ -123,7 +123,8 @@ int gsi_trans_pool_init_dma(struct device *dev, struct gsi_trans_pool *pool,
 void *gsi_trans_pool_alloc_dma(struct gsi_trans_pool *pool, dma_addr_t *addr);
 
 /**
- * gsi_trans_pool_exit() - Inverse of gsi_trans_pool_init()
+ * gsi_trans_pool_exit_dma() - Inverse of gsi_trans_pool_init_dma()
+ * @dev:	Device used for DMA
  * @pool:	Pool pointer
  */
 void gsi_trans_pool_exit_dma(struct device *dev, struct gsi_trans_pool *pool);
diff --git a/drivers/net/ipa/ipa.h b/drivers/net/ipa/ipa.h
index 8020776313716..e7ff376cb5b7d 100644
--- a/drivers/net/ipa/ipa.h
+++ b/drivers/net/ipa/ipa.h
@@ -44,6 +44,8 @@ enum ipa_flag {
  * @version:		IPA hardware version
  * @pdev:		Platform device
  * @completion:		Used to signal pipeline clear transfer complete
+ * @nb:			Notifier block used for remoteproc SSR
+ * @notifier:		Remoteproc SSR notifier
  * @smp2p:		SMP2P information
  * @clock:		IPA clocking information
  * @table_addr:		DMA address of filter/route table content
@@ -58,13 +60,12 @@ enum ipa_flag {
  * @mem_size:		Total size (bytes) of memory at @mem_virt
  * @mem:		Array of IPA-local memory region descriptors
  * @imem_iova:		I/O virtual address of IPA region in IMEM
- * @imem_size;		Size of IMEM region
+ * @imem_size:		Size of IMEM region
  * @smem_iova:		I/O virtual address of IPA region in SMEM
- * @smem_size;		Size of SMEM region
+ * @smem_size:		Size of SMEM region
  * @zero_addr:		DMA address of preallocated zero-filled memory
  * @zero_virt:		Virtual address of preallocated zero-filled memory
  * @zero_size:		Size (bytes) of preallocated zero-filled memory
- * @wakeup_source:	Wakeup source information
  * @available:		Bit mask indicating endpoints hardware supports
  * @filter_map:		Bit mask indicating endpoints that support filtering
  * @initialized:	Bit mask indicating endpoints initialized
diff --git a/drivers/net/ipa/ipa_cmd.h b/drivers/net/ipa/ipa_cmd.h
index 6dd3d35cf315d..b99262281f41c 100644
--- a/drivers/net/ipa/ipa_cmd.h
+++ b/drivers/net/ipa/ipa_cmd.h
@@ -20,11 +20,18 @@ struct gsi_channel;
 /**
  * enum ipa_cmd_opcode:	IPA immediate commands
  *
+ * @IPA_CMD_IP_V4_FILTER_INIT:	Initialize IPv4 filter table
+ * @IPA_CMD_IP_V6_FILTER_INIT:	Initialize IPv6 filter table
+ * @IPA_CMD_IP_V4_ROUTING_INIT:	Initialize IPv4 routing table
+ * @IPA_CMD_IP_V6_ROUTING_INIT:	Initialize IPv6 routing table
+ * @IPA_CMD_HDR_INIT_LOCAL:	Initialize IPA-local header memory
+ * @IPA_CMD_REGISTER_WRITE:	Register write performed by IPA
+ * @IPA_CMD_IP_PACKET_INIT:	Set up next packet's destination endpoint
+ * @IPA_CMD_DMA_SHARED_MEM:	DMA command performed by IPA
+ * @IPA_CMD_IP_PACKET_TAG_STATUS: Have next packet generate tag * status
+ * @IPA_CMD_NONE:		Special (invalid) "not a command" value
+ *
  * All immediate commands are issued using the AP command TX endpoint.
- * The numeric values here are the opcodes for IPA v3.5.1 hardware.
- *
- * IPA_CMD_NONE is a special (invalid) value that's used to indicate
- * a request is *not* an immediate command.
  */
 enum ipa_cmd_opcode {
 	IPA_CMD_NONE			= 0x0,
@@ -96,7 +103,7 @@ static inline bool ipa_cmd_data_valid(struct ipa *ipa)
  *
  * Return:	0 if successful, or a negative error code
  */
-int ipa_cmd_pool_init(struct gsi_channel *gsi_channel, u32 tre_count);
+int ipa_cmd_pool_init(struct gsi_channel *channel, u32 tre_count);
 
 /**
  * ipa_cmd_pool_exit() - Inverse of ipa_cmd_pool_init()
@@ -124,7 +131,7 @@ void ipa_cmd_table_init_add(struct gsi_trans *trans, enum ipa_cmd_opcode opcode,
 
 /**
  * ipa_cmd_hdr_init_local_add() - Add a header init command to a transaction
- * @ipa:	IPA structure
+ * @trans:	GSI transaction
  * @offset:	Offset of header memory in IPA local space
  * @size:	Size of header memory
  * @addr:	DMA address of buffer to be written from
diff --git a/drivers/net/ipa/ipa_endpoint.h b/drivers/net/ipa/ipa_endpoint.h
index c6c55ea35394f..0d410b0504562 100644
--- a/drivers/net/ipa/ipa_endpoint.h
+++ b/drivers/net/ipa/ipa_endpoint.h
@@ -41,8 +41,20 @@ enum ipa_endpoint_name {
 
 /**
  * struct ipa_endpoint - IPA endpoint information
- * @channel_id:	EP's GSI channel
- * @evt_ring_id: EP's GSI channel event ring
+ * @ipa:		IPA pointer
+ * @ee_id:		Execution environmnent endpoint is associated with
+ * @channel_id:		GSI channel used by the endpoint
+ * @endpoint_id:	IPA endpoint number
+ * @toward_ipa:		Endpoint direction (true = TX, false = RX)
+ * @data:		Endpoint configuration data
+ * @trans_tre_max:	Maximum number of TRE descriptors per transaction
+ * @evt_ring_id:	GSI event ring used by the endpoint
+ * @netdev:		Network device pointer, if endpoint uses one
+ * @replenish_enabled:	Whether receive buffer replenishing is enabled
+ * @replenish_ready:	Number of replenish transactions without doorbell
+ * @replenish_saved:	Replenish requests held while disabled
+ * @replenish_backlog:	Number of buffers needed to fill hardware queue
+ * @replenish_work:	Work item used for repeated replenish failures
  */
 struct ipa_endpoint {
 	struct ipa *ipa;
@@ -52,7 +64,7 @@ struct ipa_endpoint {
 	bool toward_ipa;
 	const struct ipa_endpoint_config_data *data;
 
-	u32 trans_tre_max;	/* maximum descriptors per transaction */
+	u32 trans_tre_max;
 	u32 evt_ring_id;
 
 	/* Net device this endpoint is associated with, if any */
diff --git a/drivers/net/ipa/ipa_interrupt.h b/drivers/net/ipa/ipa_interrupt.h
index b5d63a0cd19e4..d5c486a6800d9 100644
--- a/drivers/net/ipa/ipa_interrupt.h
+++ b/drivers/net/ipa/ipa_interrupt.h
@@ -24,6 +24,7 @@ typedef void (*ipa_irq_handler_t)(struct ipa *ipa, enum ipa_irq_id irq_id);
 
 /**
  * ipa_interrupt_add() - Register a handler for an IPA interrupt type
+ * @interrupt:	IPA interrupt structure
  * @irq_id:	IPA interrupt type
  * @handler:	Handler function for the interrupt
  *
diff --git a/drivers/net/ipa/ipa_mem.h b/drivers/net/ipa/ipa_mem.h
index f82e8939622bb..df61ef48df365 100644
--- a/drivers/net/ipa/ipa_mem.h
+++ b/drivers/net/ipa/ipa_mem.h
@@ -77,7 +77,7 @@ enum ipa_mem_id {
  * struct ipa_mem - IPA local memory region description
  * @offset:		offset in IPA memory space to base of the region
  * @size:		size in bytes base of the region
- * @canary_count	# 32-bit "canary" values that precede region
+ * @canary_count:	Number of 32-bit "canary" values that precede region
  */
 struct ipa_mem {
 	u32 offset;
diff --git a/drivers/net/ipa/ipa_qmi.h b/drivers/net/ipa/ipa_qmi.h
index 3993687593d0c..b6f2055d35a68 100644
--- a/drivers/net/ipa/ipa_qmi.h
+++ b/drivers/net/ipa/ipa_qmi.h
@@ -13,11 +13,15 @@ struct ipa;
 
 /**
  * struct ipa_qmi - QMI state associated with an IPA
- * @client_handle	- used to send an QMI requests to the modem
- * @server_handle	- used to handle QMI requests from the modem
- * @initialized		- whether QMI initialization has completed
- * @indication_register_received - tracks modem request receipt
- * @init_driver_response_received - tracks modem response receipt
+ * @client_handle:	Used to send an QMI requests to the modem
+ * @server_handle:	Used to handle QMI requests from the modem
+ * @modem_sq:		QMAP socket address for the modem QMI server
+ * @init_driver_work:	Work structure used for INIT_DRIVER message handling
+ * @initial_boot:	True if first boot has not yet completed
+ * @uc_ready:		True once DRIVER_INIT_COMPLETE request received
+ * @modem_ready:	True when INIT_DRIVER response received
+ * @indication_requested: True when INDICATION_REGISTER request received
+ * @indication_sent:	True when INIT_COMPLETE indication sent
  */
 struct ipa_qmi {
 	struct qmi_handle client_handle;
diff --git a/drivers/net/ipa/ipa_smp2p.h b/drivers/net/ipa/ipa_smp2p.h
index bf0e4063cfd96..20319438a8419 100644
--- a/drivers/net/ipa/ipa_smp2p.h
+++ b/drivers/net/ipa/ipa_smp2p.h
@@ -28,7 +28,7 @@ void ipa_smp2p_exit(struct ipa *ipa);
 
 /**
  * ipa_smp2p_disable() - Prevent "ipa-setup-ready" interrupt handling
- * @IPA:	IPA pointer
+ * @ipa:	IPA pointer
  *
  * Prevent handling of the "setup ready" interrupt from the modem.
  * This is used before initiating shutdown of the driver.
diff --git a/drivers/net/ipa/ipa_table.h b/drivers/net/ipa/ipa_table.h
index 889c2e93b1223..e14108ed62bdd 100644
--- a/drivers/net/ipa/ipa_table.h
+++ b/drivers/net/ipa/ipa_table.h
@@ -24,7 +24,7 @@ struct ipa;
 /**
  * ipa_table_valid() - Validate route and filter table memory regions
  * @ipa:	IPA pointer
-
+ *
  * Return:	true if all regions are valid, false otherwise
  */
 bool ipa_table_valid(struct ipa *ipa);
@@ -32,6 +32,7 @@ bool ipa_table_valid(struct ipa *ipa);
 /**
  * ipa_filter_map_valid() - Validate a filter table endpoint bitmap
  * @ipa:	IPA pointer
+ * @filter_mask: Filter table endpoint bitmap to check
  *
  * Return:	true if all regions are valid, false otherwise
  */
-- 
2.27.0

[PATCH net-next 2/7] net: ipa: store BCR register values in config data

[Alex Elder]

The backward compatibility register value is a platform-specific
property that is not stored in the platform data.  Create a data
field where this can be represented, and get rid ipa_reg_bcr_val().

This register is not present starting with IPA v4.5.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_data-sc7180.c |  1 +
 drivers/net/ipa/ipa_data-sdm845.c |  5 +++++
 drivers/net/ipa/ipa_data.h        |  2 ++
 drivers/net/ipa/ipa_main.c        |  4 ++--
 drivers/net/ipa/ipa_reg.h         | 21 ---------------------
 5 files changed, 10 insertions(+), 23 deletions(-)

diff --git a/drivers/net/ipa/ipa_data-sc7180.c b/drivers/net/ipa/ipa_data-sc7180.c
index c9b6a6aaadacc..810c673be56ee 100644
--- a/drivers/net/ipa/ipa_data-sc7180.c
+++ b/drivers/net/ipa/ipa_data-sc7180.c
@@ -349,6 +349,7 @@ static const struct ipa_clock_data ipa_clock_data = {
 /* Configuration data for the SC7180 SoC. */
 const struct ipa_data ipa_data_sc7180 = {
 	.version	= IPA_VERSION_4_2,
+	/* backward_compat value is 0 */
 	.qsb_count	= ARRAY_SIZE(ipa_qsb_data),
 	.qsb_data	= ipa_qsb_data,
 	.endpoint_count	= ARRAY_SIZE(ipa_gsi_endpoint_data),
diff --git a/drivers/net/ipa/ipa_data-sdm845.c b/drivers/net/ipa/ipa_data-sdm845.c
index e14e3fb1d9700..49a18b1047c58 100644
--- a/drivers/net/ipa/ipa_data-sdm845.c
+++ b/drivers/net/ipa/ipa_data-sdm845.c
@@ -397,6 +397,11 @@ static const struct ipa_clock_data ipa_clock_data = {
 /* Configuration data for the SDM845 SoC. */
 const struct ipa_data ipa_data_sdm845 = {
 	.version	= IPA_VERSION_3_5_1,
+	.backward_compat = BCR_CMDQ_L_LACK_ONE_ENTRY_FMASK |
+			   BCR_TX_NOT_USING_BRESP_FMASK |
+			   BCR_SUSPEND_L2_IRQ_FMASK |
+			   BCR_HOLB_DROP_L2_IRQ_FMASK |
+			   BCR_DUAL_TX_FMASK,
 	.qsb_count	= ARRAY_SIZE(ipa_qsb_data),
 	.qsb_data	= ipa_qsb_data,
 	.endpoint_count	= ARRAY_SIZE(ipa_gsi_endpoint_data),
diff --git a/drivers/net/ipa/ipa_data.h b/drivers/net/ipa/ipa_data.h
index ea8f99286228e..843d818f78e18 100644
--- a/drivers/net/ipa/ipa_data.h
+++ b/drivers/net/ipa/ipa_data.h
@@ -279,6 +279,7 @@ struct ipa_clock_data {
 /**
  * struct ipa_data - combined IPA/GSI configuration data
  * @version:		IPA hardware version
+ * @backward_compat:	BCR register value (prior to IPA v4.5 only)
  * @qsb_count:		number of entries in the qsb_data array
  * @qsb_data:		Qualcomm System Bus configuration data
  * @endpoint_count:	number of entries in the endpoint_data array
@@ -289,6 +290,7 @@ struct ipa_clock_data {
  */
 struct ipa_data {
 	enum ipa_version version;
+	u32 backward_compat;
 	u32 qsb_count;		/* number of entries in qsb_data[] */
 	const struct ipa_qsb_data *qsb_data;
 	u32 endpoint_count;	/* number of entries in endpoint_data[] */
diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c
index e18029152d780..afb8eb5618f73 100644
--- a/drivers/net/ipa/ipa_main.c
+++ b/drivers/net/ipa/ipa_main.c
@@ -397,9 +397,9 @@ static void ipa_hardware_config(struct ipa *ipa, const struct ipa_data *data)
 	u32 granularity;
 	u32 val;
 
-	/* IPA v4.5 has no backward compatibility register */
+	/* IPA v4.5+ has no backward compatibility register */
 	if (version < IPA_VERSION_4_5) {
-		val = ipa_reg_bcr_val(version);
+		val = data->backward_compat;
 		iowrite32(val, ipa->reg_virt + IPA_REG_BCR_OFFSET);
 	}
 
diff --git a/drivers/net/ipa/ipa_reg.h b/drivers/net/ipa/ipa_reg.h
index de2a944bad86b..286ea9634c49d 100644
--- a/drivers/net/ipa/ipa_reg.h
+++ b/drivers/net/ipa/ipa_reg.h
@@ -235,27 +235,6 @@ static inline u32 ipa_reg_state_aggr_active_offset(enum ipa_version version)
 #define BCR_FILTER_PREFETCH_EN_FMASK		GENMASK(8, 8)
 #define BCR_ROUTER_PREFETCH_EN_FMASK		GENMASK(9, 9)
 
-/* Backward compatibility register value to use for each version */
-static inline u32 ipa_reg_bcr_val(enum ipa_version version)
-{
-	if (version == IPA_VERSION_3_5_1)
-		return BCR_CMDQ_L_LACK_ONE_ENTRY_FMASK |
-			BCR_TX_NOT_USING_BRESP_FMASK |
-			BCR_SUSPEND_L2_IRQ_FMASK |
-			BCR_HOLB_DROP_L2_IRQ_FMASK |
-			BCR_DUAL_TX_FMASK;
-
-	if (version == IPA_VERSION_4_0 || version == IPA_VERSION_4_1)
-		return BCR_CMDQ_L_LACK_ONE_ENTRY_FMASK |
-			BCR_SUSPEND_L2_IRQ_FMASK |
-			BCR_HOLB_DROP_L2_IRQ_FMASK |
-			BCR_DUAL_TX_FMASK;
-
-	/* assert(version != IPA_VERSION_4_5); */
-
-	return 0x00000000;
-}
-
 /* The value of the next register must be a multiple of 8 (bottom 3 bits 0) */
 #define IPA_REG_LOCAL_PKT_PROC_CNTXT_OFFSET		0x000001e8
 
-- 
2.27.0

[PATCH net-next 3/7] net: ipa: don't define endpoints unnecessarily

[Alex Elder]

We don't typically need much information about modem endpoints.
Normally we need to specify information about modem endpoints in
configuration data in only two cases:
  - When a modem TX endpoint supports filtering
  - When another endpoint's configuration refers to it

For the first case, the AP initializes the filter table, and must
know how many endpoints (AP and modem) support filtering.  An
example of the second case is the AP->modem TX endpoint, which
defines the modem<-AP RX endpoint as its status endpoint.

There is one exception to this, and it's due to a hardware quirk.
For IPA v4.2 (only) there is a problem related to allocating GSI
channels.  And to work around this, the AP allocates *all* GSI
channels at startup time--including those used by the modem.

Get rid of the configuration information for two endpoints not
required for the SDM845.  SC7180 runs IPA v4.2, so we can't
eliminate any modem endpoint definitions there.

Two more minor changes:
  - Reorder the members defined for the ipa_endpoint_name enumerated
    type to match the order used in configuration data files when
    defining endpoints.
  - Add a new name, IPA_ENDPOINT_MODEM_DL_NLO_TX, which can be used
    for IPA v4.5+.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_data-sdm845.c | 12 ------------
 drivers/net/ipa/ipa_endpoint.h    | 11 ++++++-----
 2 files changed, 6 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ipa/ipa_data-sdm845.c b/drivers/net/ipa/ipa_data-sdm845.c
index 49a18b1047c58..ed0bfe0634d98 100644
--- a/drivers/net/ipa/ipa_data-sdm845.c
+++ b/drivers/net/ipa/ipa_data-sdm845.c
@@ -144,12 +144,6 @@ static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
 			},
 		},
 	},
-	[IPA_ENDPOINT_MODEM_COMMAND_TX] = {
-		.ee_id		= GSI_EE_MODEM,
-		.channel_id	= 1,
-		.endpoint_id	= 4,
-		.toward_ipa	= true,
-	},
 	[IPA_ENDPOINT_MODEM_LAN_TX] = {
 		.ee_id		= GSI_EE_MODEM,
 		.channel_id	= 0,
@@ -159,12 +153,6 @@ static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
 			.filter_support	= true,
 		},
 	},
-	[IPA_ENDPOINT_MODEM_LAN_RX] = {
-		.ee_id		= GSI_EE_MODEM,
-		.channel_id	= 3,
-		.endpoint_id	= 13,
-		.toward_ipa	= false,
-	},
 	[IPA_ENDPOINT_MODEM_AP_TX] = {
 		.ee_id		= GSI_EE_MODEM,
 		.channel_id	= 4,
diff --git a/drivers/net/ipa/ipa_endpoint.h b/drivers/net/ipa/ipa_endpoint.h
index 0d410b0504562..f034a9e6ef215 100644
--- a/drivers/net/ipa/ipa_endpoint.h
+++ b/drivers/net/ipa/ipa_endpoint.h
@@ -25,15 +25,16 @@ struct ipa_gsi_endpoint_data;
 #define IPA_MTU			ETH_DATA_LEN
 
 enum ipa_endpoint_name {
-	IPA_ENDPOINT_AP_MODEM_TX,
-	IPA_ENDPOINT_MODEM_LAN_TX,
-	IPA_ENDPOINT_MODEM_COMMAND_TX,
 	IPA_ENDPOINT_AP_COMMAND_TX,
-	IPA_ENDPOINT_MODEM_AP_TX,
 	IPA_ENDPOINT_AP_LAN_RX,
+	IPA_ENDPOINT_AP_MODEM_TX,
 	IPA_ENDPOINT_AP_MODEM_RX,
-	IPA_ENDPOINT_MODEM_AP_RX,
+	IPA_ENDPOINT_MODEM_COMMAND_TX,
+	IPA_ENDPOINT_MODEM_LAN_TX,
 	IPA_ENDPOINT_MODEM_LAN_RX,
+	IPA_ENDPOINT_MODEM_AP_TX,
+	IPA_ENDPOINT_MODEM_AP_RX,
+	IPA_ENDPOINT_MODEM_DL_NLO_TX,
 	IPA_ENDPOINT_COUNT,	/* Number of names (not an index) */
 };
 
-- 
2.27.0

[PATCH net-next 4/7] net: ipa: switch to version based configuration

[Alex Elder]

Rename the SDM845 configuration data file so that its name is
derived from its IPA version.  I am not aware of any special IPA
behavior or handling that would be based on a specific SoC (as
opposed to a specific version of the IPA it contains).

Update a few other references to the code that talk about the SDM845
rather than just IPA v3.5.1.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/Kconfig                       |  3 +--
 drivers/net/ipa/Makefile                      |  2 +-
 .../{ipa_data-sdm845.c => ipa_data-v3.5.1.c}  | 22 ++++++++++---------
 drivers/net/ipa/ipa_data.h                    |  2 +-
 drivers/net/ipa/ipa_main.c                    |  2 +-
 5 files changed, 16 insertions(+), 15 deletions(-)
 rename drivers/net/ipa/{ipa_data-sdm845.c => ipa_data-v3.5.1.c} (92%)

diff --git a/drivers/net/ipa/Kconfig b/drivers/net/ipa/Kconfig
index 90a90262e0d07..8f99cfa14680a 100644
--- a/drivers/net/ipa/Kconfig
+++ b/drivers/net/ipa/Kconfig
@@ -12,8 +12,7 @@ config QCOM_IPA
 	  that is capable of generic hardware handling of IP packets,
 	  including routing, filtering, and NAT.  Currently the IPA
 	  driver supports only basic transport of network traffic
-	  between the AP and modem, on the Qualcomm SDM845 and SC7180
-	  SoCs.
+	  between the AP and modem.
 
 	  Note that if selected, the selection type must match that
 	  of QCOM_Q6V5_COMMON (Y or M).
diff --git a/drivers/net/ipa/Makefile b/drivers/net/ipa/Makefile
index 14a7d8429baa2..a4a42fc7b840e 100644
--- a/drivers/net/ipa/Makefile
+++ b/drivers/net/ipa/Makefile
@@ -9,4 +9,4 @@ ipa-y			:=	ipa_main.o ipa_clock.o ipa_reg.o ipa_mem.o \
 				ipa_endpoint.o ipa_cmd.o ipa_modem.o \
 				ipa_resource.o ipa_qmi.o ipa_qmi_msg.o
 
-ipa-y			+=	ipa_data-sdm845.o ipa_data-sc7180.o
+ipa-y			+=	ipa_data-v3.5.1.o ipa_data-sc7180.o
diff --git a/drivers/net/ipa/ipa_data-sdm845.c b/drivers/net/ipa/ipa_data-v3.5.1.c
similarity index 92%
rename from drivers/net/ipa/ipa_data-sdm845.c
rename to drivers/net/ipa/ipa_data-v3.5.1.c
index ed0bfe0634d98..57703e95a3f9c 100644
--- a/drivers/net/ipa/ipa_data-sdm845.c
+++ b/drivers/net/ipa/ipa_data-v3.5.1.c
@@ -11,7 +11,7 @@
 #include "ipa_endpoint.h"
 #include "ipa_mem.h"
 
-/** enum ipa_resource_type - IPA resource types */
+/** enum ipa_resource_type - IPA resource types for an SoC having IPA v3.5.1 */
 enum ipa_resource_type {
 	/* Source resource types; first must have value 0 */
 	IPA_RESOURCE_TYPE_SRC_PKT_CONTEXTS		= 0,
@@ -25,7 +25,7 @@ enum ipa_resource_type {
 	IPA_RESOURCE_TYPE_DST_DPS_DMARS,
 };
 
-/* Resource groups used for the SDM845 SoC */
+/* Resource groups used for an SoC having IPA v3.5.1 */
 enum ipa_rsrc_group_id {
 	/* Source resource group identifiers */
 	IPA_RSRC_GROUP_SRC_LWA_DL	= 0,
@@ -41,7 +41,7 @@ enum ipa_rsrc_group_id {
 	IPA_RSRC_GROUP_DST_COUNT,	/* Last; not a destination group */
 };
 
-/* QSB configuration for the SDM845 SoC. */
+/* QSB configuration data for an SoC having IPA v3.5.1 */
 static const struct ipa_qsb_data ipa_qsb_data[] = {
 	[IPA_QSB_MASTER_DDR] = {
 		.max_writes	= 8,
@@ -53,7 +53,7 @@ static const struct ipa_qsb_data ipa_qsb_data[] = {
 	},
 };
 
-/* Endpoint configuration for the SDM845 SoC. */
+/* Endpoint datdata for an SoC having IPA v3.5.1 */
 static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
 	[IPA_ENDPOINT_AP_COMMAND_TX] = {
 		.ee_id		= GSI_EE_AP,
@@ -170,7 +170,7 @@ static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
 	},
 };
 
-/* Source resource configuration data for the SDM845 SoC */
+/* Source resource configuration data for an SoC having IPA v3.5.1 */
 static const struct ipa_resource ipa_resource_src[] = {
 	[IPA_RESOURCE_TYPE_SRC_PKT_CONTEXTS] = {
 		.limits[IPA_RSRC_GROUP_SRC_LWA_DL] = {
@@ -232,7 +232,7 @@ static const struct ipa_resource ipa_resource_src[] = {
 	},
 };
 
-/* Destination resource configuration data for the SDM845 SoC */
+/* Destination resource configuration data for an SoC having IPA v3.5.1 */
 static const struct ipa_resource ipa_resource_dst[] = {
 	[IPA_RESOURCE_TYPE_DST_DATA_SECTORS] = {
 		.limits[IPA_RSRC_GROUP_DST_LWA_DL] = {
@@ -258,7 +258,7 @@ static const struct ipa_resource ipa_resource_dst[] = {
 	},
 };
 
-/* Resource configuration for the SDM845 SoC. */
+/* Resource configuration data for an SoC having IPA v3.5.1 */
 static const struct ipa_resource_data ipa_resource_data = {
 	.rsrc_group_src_count	= IPA_RSRC_GROUP_SRC_COUNT,
 	.rsrc_group_dst_count	= IPA_RSRC_GROUP_DST_COUNT,
@@ -268,7 +268,7 @@ static const struct ipa_resource_data ipa_resource_data = {
 	.resource_dst		= ipa_resource_dst,
 };
 
-/* IPA-resident memory region configuration for the SDM845 SoC. */
+/* IPA-resident memory region data for an SoC having IPA v3.5.1 */
 static const struct ipa_mem ipa_mem_local_data[] = {
 	[IPA_MEM_UC_SHARED] = {
 		.offset		= 0x0000,
@@ -347,6 +347,7 @@ static const struct ipa_mem ipa_mem_local_data[] = {
 	},
 };
 
+/* Memory configuration data for an SoC having IPA v3.5.1 */
 static const struct ipa_mem_data ipa_mem_data = {
 	.local_count	= ARRAY_SIZE(ipa_mem_local_data),
 	.local		= ipa_mem_local_data,
@@ -376,14 +377,15 @@ static const struct ipa_interconnect_data ipa_interconnect_data[] = {
 	},
 };
 
+/* Clock and interconnect configuration data for an SoC having IPA v3.5.1 */
 static const struct ipa_clock_data ipa_clock_data = {
 	.core_clock_rate	= 75 * 1000 * 1000,	/* Hz */
 	.interconnect_count	= ARRAY_SIZE(ipa_interconnect_data),
 	.interconnect_data	= ipa_interconnect_data,
 };
 
-/* Configuration data for the SDM845 SoC. */
-const struct ipa_data ipa_data_sdm845 = {
+/* Configuration data for an SoC having IPA v3.5.1 */
+const struct ipa_data ipa_data_v3_5_1 = {
 	.version	= IPA_VERSION_3_5_1,
 	.backward_compat = BCR_CMDQ_L_LACK_ONE_ENTRY_FMASK |
 			   BCR_TX_NOT_USING_BRESP_FMASK |
diff --git a/drivers/net/ipa/ipa_data.h b/drivers/net/ipa/ipa_data.h
index 843d818f78e18..17cdc376e95f3 100644
--- a/drivers/net/ipa/ipa_data.h
+++ b/drivers/net/ipa/ipa_data.h
@@ -300,7 +300,7 @@ struct ipa_data {
 	const struct ipa_clock_data *clock_data;
 };
 
-extern const struct ipa_data ipa_data_sdm845;
+extern const struct ipa_data ipa_data_v3_5_1;
 extern const struct ipa_data ipa_data_sc7180;
 
 #endif /* _IPA_DATA_H_ */
diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c
index afb8eb5618f73..37e85a5ab75cf 100644
--- a/drivers/net/ipa/ipa_main.c
+++ b/drivers/net/ipa/ipa_main.c
@@ -578,7 +578,7 @@ static int ipa_firmware_load(struct device *dev)
 static const struct of_device_id ipa_match[] = {
 	{
 		.compatible	= "qcom,sdm845-ipa",
-		.data		= &ipa_data_sdm845,
+		.data		= &ipa_data_v3_5_1,
 	},
 	{
 		.compatible	= "qcom,sc7180-ipa",
-- 
2.27.0

[PATCH net-next 5/7] net: ipa: use version based configuration for SC7180

[Alex Elder]

Rename the SC7180 configuration data file so that its name is
derived from its IPA version.

Update a few other references to the code that talk about the SC7180
rather than just IPA v4.2.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/Makefile                      |  2 +-
 .../{ipa_data-sc7180.c => ipa_data-v4.2.c}    | 24 ++++++++++---------
 drivers/net/ipa/ipa_data.h                    |  2 +-
 drivers/net/ipa/ipa_main.c                    |  2 +-
 4 files changed, 16 insertions(+), 14 deletions(-)
 rename drivers/net/ipa/{ipa_data-sc7180.c => ipa_data-v4.2.c} (90%)

diff --git a/drivers/net/ipa/Makefile b/drivers/net/ipa/Makefile
index a4a42fc7b840e..6abd1db9fe330 100644
--- a/drivers/net/ipa/Makefile
+++ b/drivers/net/ipa/Makefile
@@ -9,4 +9,4 @@ ipa-y			:=	ipa_main.o ipa_clock.o ipa_reg.o ipa_mem.o \
 				ipa_endpoint.o ipa_cmd.o ipa_modem.o \
 				ipa_resource.o ipa_qmi.o ipa_qmi_msg.o
 
-ipa-y			+=	ipa_data-v3.5.1.o ipa_data-sc7180.o
+ipa-y			+=	ipa_data-v3.5.1.o ipa_data-v4.2.o
diff --git a/drivers/net/ipa/ipa_data-sc7180.c b/drivers/net/ipa/ipa_data-v4.2.c
similarity index 90%
rename from drivers/net/ipa/ipa_data-sc7180.c
rename to drivers/net/ipa/ipa_data-v4.2.c
index 810c673be56ee..8744f19c64011 100644
--- a/drivers/net/ipa/ipa_data-sc7180.c
+++ b/drivers/net/ipa/ipa_data-v4.2.c
@@ -9,7 +9,7 @@
 #include "ipa_endpoint.h"
 #include "ipa_mem.h"
 
-/** enum ipa_resource_type - IPA resource types */
+/** enum ipa_resource_type - IPA resource types for an SoC having IPA v4.2 */
 enum ipa_resource_type {
 	/* Source resource types; first must have value 0 */
 	IPA_RESOURCE_TYPE_SRC_PKT_CONTEXTS		= 0,
@@ -23,7 +23,7 @@ enum ipa_resource_type {
 	IPA_RESOURCE_TYPE_DST_DPS_DMARS,
 };
 
-/* Resource groups used for the SC7180 SoC */
+/* Resource groups used for an SoC having IPA v4.2 */
 enum ipa_rsrc_group_id {
 	/* Source resource group identifiers */
 	IPA_RSRC_GROUP_SRC_UL_DL	= 0,
@@ -34,7 +34,7 @@ enum ipa_rsrc_group_id {
 	IPA_RSRC_GROUP_DST_COUNT,	/* Last; not a destination group */
 };
 
-/* QSB configuration for the SC7180 SoC. */
+/* QSB configuration data for an SoC having IPA v4.2 */
 static const struct ipa_qsb_data ipa_qsb_data[] = {
 	[IPA_QSB_MASTER_DDR] = {
 		.max_writes	= 8,
@@ -43,7 +43,7 @@ static const struct ipa_qsb_data ipa_qsb_data[] = {
 	},
 };
 
-/* Endpoint configuration for the SC7180 SoC. */
+/* Endpoint configuration data for an SoC having IPA v4.2 */
 static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
 	[IPA_ENDPOINT_AP_COMMAND_TX] = {
 		.ee_id		= GSI_EE_AP,
@@ -164,7 +164,7 @@ static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
 	},
 };
 
-/* Source resource configuration data for the SC7180 SoC */
+/* Source resource configuration data for an SoC having IPA v4.2 */
 static const struct ipa_resource ipa_resource_src[] = {
 	[IPA_RESOURCE_TYPE_SRC_PKT_CONTEXTS] = {
 		.limits[IPA_RSRC_GROUP_SRC_UL_DL] = {
@@ -193,7 +193,7 @@ static const struct ipa_resource ipa_resource_src[] = {
 	},
 };
 
-/* Destination resource configuration data for the SC7180 SoC */
+/* Destination resource configuration data for an SoC having IPA v4.2 */
 static const struct ipa_resource ipa_resource_dst[] = {
 	[IPA_RESOURCE_TYPE_DST_DATA_SECTORS] = {
 		.limits[IPA_RSRC_GROUP_DST_UL_DL_DPL] = {
@@ -207,7 +207,7 @@ static const struct ipa_resource ipa_resource_dst[] = {
 	},
 };
 
-/* Resource configuration for the SC7180 SoC. */
+/* Resource configuration data for an SoC having IPA v4.2 */
 static const struct ipa_resource_data ipa_resource_data = {
 	.rsrc_group_src_count	= IPA_RSRC_GROUP_SRC_COUNT,
 	.rsrc_group_dst_count	= IPA_RSRC_GROUP_DST_COUNT,
@@ -217,7 +217,7 @@ static const struct ipa_resource_data ipa_resource_data = {
 	.resource_dst		= ipa_resource_dst,
 };
 
-/* IPA-resident memory region configuration for the SC7180 SoC. */
+/* IPA-resident memory region data for an SoC having IPA v4.2 */
 static const struct ipa_mem ipa_mem_local_data[] = {
 	[IPA_MEM_UC_SHARED] = {
 		.offset		= 0x0000,
@@ -311,6 +311,7 @@ static const struct ipa_mem ipa_mem_local_data[] = {
 	},
 };
 
+/* Memory configuration data for an SoC having IPA v4.2 */
 static const struct ipa_mem_data ipa_mem_data = {
 	.local_count	= ARRAY_SIZE(ipa_mem_local_data),
 	.local		= ipa_mem_local_data,
@@ -320,7 +321,7 @@ static const struct ipa_mem_data ipa_mem_data = {
 	.smem_size	= 0x00002000,
 };
 
-/* Interconnect bandwidths are in 1000 byte/second units */
+/* Interconnect rates are in 1000 byte/second units */
 static const struct ipa_interconnect_data ipa_interconnect_data[] = {
 	{
 		.name			= "memory",
@@ -340,14 +341,15 @@ static const struct ipa_interconnect_data ipa_interconnect_data[] = {
 	},
 };
 
+/* Clock and interconnect configuration data for an SoC having IPA v4.2 */
 static const struct ipa_clock_data ipa_clock_data = {
 	.core_clock_rate	= 100 * 1000 * 1000,	/* Hz */
 	.interconnect_count	= ARRAY_SIZE(ipa_interconnect_data),
 	.interconnect_data	= ipa_interconnect_data,
 };
 
-/* Configuration data for the SC7180 SoC. */
-const struct ipa_data ipa_data_sc7180 = {
+/* Configuration data for an SoC having IPA v4.2 */
+const struct ipa_data ipa_data_v4_2 = {
 	.version	= IPA_VERSION_4_2,
 	/* backward_compat value is 0 */
 	.qsb_count	= ARRAY_SIZE(ipa_qsb_data),
diff --git a/drivers/net/ipa/ipa_data.h b/drivers/net/ipa/ipa_data.h
index 17cdc376e95f3..e97342e80d537 100644
--- a/drivers/net/ipa/ipa_data.h
+++ b/drivers/net/ipa/ipa_data.h
@@ -301,6 +301,6 @@ struct ipa_data {
 };
 
 extern const struct ipa_data ipa_data_v3_5_1;
-extern const struct ipa_data ipa_data_sc7180;
+extern const struct ipa_data ipa_data_v4_2;
 
 #endif /* _IPA_DATA_H_ */
diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c
index 37e85a5ab75cf..a970d10e650ef 100644
--- a/drivers/net/ipa/ipa_main.c
+++ b/drivers/net/ipa/ipa_main.c
@@ -582,7 +582,7 @@ static const struct of_device_id ipa_match[] = {
 	},
 	{
 		.compatible	= "qcom,sc7180-ipa",
-		.data		= &ipa_data_sc7180,
+		.data		= &ipa_data_v4_2,
 	},
 	{ },
 };
-- 
2.27.0

[PATCH net-next 6/7] net: ipa: DMA addresses are nicely aligned

[Alex Elder]

A recent patch avoided doing 64-bit modulo operations by checking
the alignment of some DMA allocations using only the lower 32 bits
of the address.

David Laight pointed out (after the fix was committed) that DMA
allocations might already satisfy the alignment requirements.  And
he was right.

Remove the alignment checks that occur after DMA allocation requests,
and update comments to explain why the constraint is satisfied.  The
only place IPA_TABLE_ALIGN was used was to check the alignment; it is
therefore no longer needed, so get rid of it.

Add comments where GSI_RING_ELEMENT_SIZE and the tre_count and
event_count channel data fields are defined to make explicit they
are required to be powers of 2.

Revise a comment in gsi_trans_pool_init_dma(), taking into account
that dma_alloc_coherent() guarantees its result is aligned to a page
size (or order thereof).

Don't bother printing an error if a DMA allocation fails.

Suggested-by: David Laight <David.Laight@ACULAB.COM>
Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/gsi.c         | 13 ++++---------
 drivers/net/ipa/gsi_private.h |  2 +-
 drivers/net/ipa/gsi_trans.c   |  9 ++++-----
 drivers/net/ipa/ipa_data.h    |  4 ++--
 drivers/net/ipa/ipa_table.c   | 24 ++++++------------------
 5 files changed, 17 insertions(+), 35 deletions(-)

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index 585574af36ecd..1c835b3e1a437 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -1444,18 +1444,13 @@ static int gsi_ring_alloc(struct gsi *gsi, struct gsi_ring *ring, u32 count)
 	dma_addr_t addr;
 
 	/* Hardware requires a 2^n ring size, with alignment equal to size.
-	 * The size is a power of 2, so we can check alignment using just
-	 * the bottom 32 bits for a DMA address of any size.
+	 * The DMA address returned by dma_alloc_coherent() is guaranteed to
+	 * be a power-of-2 number of pages, which satisfies the requirement.
 	 */
 	ring->virt = dma_alloc_coherent(dev, size, &addr, GFP_KERNEL);
-	if (ring->virt && lower_32_bits(addr) % size) {
-		dma_free_coherent(dev, size, ring->virt, addr);
-		dev_err(dev, "unable to alloc 0x%x-aligned ring buffer\n",
-			size);
-		return -EINVAL;	/* Not a good error value, but distinct */
-	} else if (!ring->virt) {
+	if (!ring->virt)
 		return -ENOMEM;
-	}
+
 	ring->addr = addr;
 	ring->count = count;
 
diff --git a/drivers/net/ipa/gsi_private.h b/drivers/net/ipa/gsi_private.h
index ed7bc26f85e9a..ea333a244cf5e 100644
--- a/drivers/net/ipa/gsi_private.h
+++ b/drivers/net/ipa/gsi_private.h
@@ -14,7 +14,7 @@ struct gsi_trans;
 struct gsi_ring;
 struct gsi_channel;
 
-#define GSI_RING_ELEMENT_SIZE	16	/* bytes */
+#define GSI_RING_ELEMENT_SIZE	16	/* bytes; must be a power of 2 */
 
 /* Return the entry that follows one provided in a transaction pool */
 void *gsi_trans_pool_next(struct gsi_trans_pool *pool, void *element);
diff --git a/drivers/net/ipa/gsi_trans.c b/drivers/net/ipa/gsi_trans.c
index 6c3ed5b17b80c..70c2b585f98d6 100644
--- a/drivers/net/ipa/gsi_trans.c
+++ b/drivers/net/ipa/gsi_trans.c
@@ -153,11 +153,10 @@ int gsi_trans_pool_init_dma(struct device *dev, struct gsi_trans_pool *pool,
 	size = __roundup_pow_of_two(size);
 	total_size = (count + max_alloc - 1) * size;
 
-	/* The allocator will give us a power-of-2 number of pages.  But we
-	 * can't guarantee that, so request it.  That way we won't waste any
-	 * memory that would be available beyond the required space.
-	 *
-	 * Note that gsi_trans_pool_exit_dma() assumes the total allocated
+	/* The allocator will give us a power-of-2 number of pages
+	 * sufficient to satisfy our request.  Round up our requested
+	 * size to avoid any unused space in the allocation.  This way
+	 * gsi_trans_pool_exit_dma() can assume the total allocated
 	 * size is exactly (count * size).
 	 */
 	total_size = get_order(total_size) << PAGE_SHIFT;
diff --git a/drivers/net/ipa/ipa_data.h b/drivers/net/ipa/ipa_data.h
index e97342e80d537..769f68923527f 100644
--- a/drivers/net/ipa/ipa_data.h
+++ b/drivers/net/ipa/ipa_data.h
@@ -90,8 +90,8 @@ struct ipa_qsb_data {
  * that can be included in a single transaction.
  */
 struct gsi_channel_data {
-	u16 tre_count;
-	u16 event_count;
+	u16 tre_count;			/* must be a power of 2 */
+	u16 event_count;		/* must be a power of 2 */
 	u8 tlv_count;
 };
 
diff --git a/drivers/net/ipa/ipa_table.c b/drivers/net/ipa/ipa_table.c
index 4236a50ff03ae..d9538661755f4 100644
--- a/drivers/net/ipa/ipa_table.c
+++ b/drivers/net/ipa/ipa_table.c
@@ -96,9 +96,6 @@
  *                 ----------------------
  */
 
-/* IPA hardware constrains filter and route tables alignment */
-#define IPA_TABLE_ALIGN			128	/* Minimum table alignment */
-
 /* Assignment of route table entries to the modem and AP */
 #define IPA_ROUTE_MODEM_MIN		0
 #define IPA_ROUTE_MODEM_COUNT		8
@@ -652,26 +649,17 @@ int ipa_table_init(struct ipa *ipa)
 
 	ipa_table_validate_build();
 
+	/* The IPA hardware requires route and filter table rules to be
+	 * aligned on a 128-byte boundary.  We put the "zero rule" at the
+	 * base of the table area allocated here.  The DMA address returned
+	 * by dma_alloc_coherent() is guaranteed to be a power-of-2 number
+	 * of pages, which satisfies the rule alignment requirement.
+	 */
 	size = IPA_ZERO_RULE_SIZE + (1 + count) * IPA_TABLE_ENTRY_SIZE;
 	virt = dma_alloc_coherent(dev, size, &addr, GFP_KERNEL);
 	if (!virt)
 		return -ENOMEM;
 
-	/* We put the "zero rule" at the base of our table area.  The IPA
-	 * hardware requires route and filter table rules to be aligned
-	 * on a 128-byte boundary.  As long as the alignment constraint
-	 * is a power of 2, we can check alignment using just the bottom
-	 * 32 bits for a DMA address of any size.
-	 */
-	BUILD_BUG_ON(!is_power_of_2(IPA_TABLE_ALIGN));
-	if (lower_32_bits(addr) % IPA_TABLE_ALIGN) {
-		dev_err(dev, "table address %pad not %u-byte aligned\n",
-			&addr, IPA_TABLE_ALIGN);
-		dma_free_coherent(dev, size, virt, addr);
-
-		return -ERANGE;
-	}
-
 	ipa->table_virt = virt;
 	ipa->table_addr = addr;
 
-- 
2.27.0

[PATCH net-next 7/7] net: ipa: kill IPA_TABLE_ENTRY_SIZE

[Alex Elder]

Entries in an IPA route or filter table are 64-bit little-endian
addresses, each of which refers to a routing or filtering rule.

The format of these table slots are fixed, but IPA_TABLE_ENTRY_SIZE
is used to define their size.  This symbol doesn't really add value,
and I think it unnecessarily obscures what a table entry *is*.

So get rid of IPA_TABLE_ENTRY_SIZE, and just use sizeof(__le64) in
its place throughout the code.

Update the comments in "ipa_table.c" to provide a little better
explanation of these table slots.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_cmd.c   |  2 +-
 drivers/net/ipa/ipa_qmi.c   | 10 +++----
 drivers/net/ipa/ipa_table.c | 59 +++++++++++++++++++++----------------
 drivers/net/ipa/ipa_table.h |  3 --
 4 files changed, 39 insertions(+), 35 deletions(-)

diff --git a/drivers/net/ipa/ipa_cmd.c b/drivers/net/ipa/ipa_cmd.c
index 2ac6dd8413dee..525cdf28d9ea7 100644
--- a/drivers/net/ipa/ipa_cmd.c
+++ b/drivers/net/ipa/ipa_cmd.c
@@ -153,7 +153,7 @@ static void ipa_cmd_validate_build(void)
 	 * of entries, as and IPv4 and IPv6 route tables have the same number
 	 * of entries.
 	 */
-#define TABLE_SIZE	(TABLE_COUNT_MAX * IPA_TABLE_ENTRY_SIZE)
+#define TABLE_SIZE	(TABLE_COUNT_MAX * sizeof(__le64))
 #define TABLE_COUNT_MAX	max_t(u32, IPA_ROUTE_COUNT_MAX, IPA_FILTER_COUNT_MAX)
 	BUILD_BUG_ON(TABLE_SIZE > field_max(IP_FLTRT_FLAGS_HASH_SIZE_FMASK));
 	BUILD_BUG_ON(TABLE_SIZE > field_max(IP_FLTRT_FLAGS_NHASH_SIZE_FMASK));
diff --git a/drivers/net/ipa/ipa_qmi.c b/drivers/net/ipa/ipa_qmi.c
index ccdb4a6a4c75b..593665efbcf99 100644
--- a/drivers/net/ipa/ipa_qmi.c
+++ b/drivers/net/ipa/ipa_qmi.c
@@ -308,12 +308,12 @@ init_modem_driver_req(struct ipa_qmi *ipa_qmi)
 	mem = &ipa->mem[IPA_MEM_V4_ROUTE];
 	req.v4_route_tbl_info_valid = 1;
 	req.v4_route_tbl_info.start = ipa->mem_offset + mem->offset;
-	req.v4_route_tbl_info.count = mem->size / IPA_TABLE_ENTRY_SIZE;
+	req.v4_route_tbl_info.count = mem->size / sizeof(__le64);
 
 	mem = &ipa->mem[IPA_MEM_V6_ROUTE];
 	req.v6_route_tbl_info_valid = 1;
 	req.v6_route_tbl_info.start = ipa->mem_offset + mem->offset;
-	req.v6_route_tbl_info.count = mem->size / IPA_TABLE_ENTRY_SIZE;
+	req.v6_route_tbl_info.count = mem->size / sizeof(__le64);
 
 	mem = &ipa->mem[IPA_MEM_V4_FILTER];
 	req.v4_filter_tbl_start_valid = 1;
@@ -352,8 +352,7 @@ init_modem_driver_req(struct ipa_qmi *ipa_qmi)
 		req.v4_hash_route_tbl_info_valid = 1;
 		req.v4_hash_route_tbl_info.start =
 				ipa->mem_offset + mem->offset;
-		req.v4_hash_route_tbl_info.count =
-				mem->size / IPA_TABLE_ENTRY_SIZE;
+		req.v4_hash_route_tbl_info.count = mem->size / sizeof(__le64);
 	}
 
 	mem = &ipa->mem[IPA_MEM_V6_ROUTE_HASHED];
@@ -361,8 +360,7 @@ init_modem_driver_req(struct ipa_qmi *ipa_qmi)
 		req.v6_hash_route_tbl_info_valid = 1;
 		req.v6_hash_route_tbl_info.start =
 			ipa->mem_offset + mem->offset;
-		req.v6_hash_route_tbl_info.count =
-			mem->size / IPA_TABLE_ENTRY_SIZE;
+		req.v6_hash_route_tbl_info.count = mem->size / sizeof(__le64);
 	}
 
 	mem = &ipa->mem[IPA_MEM_V4_FILTER_HASHED];
diff --git a/drivers/net/ipa/ipa_table.c b/drivers/net/ipa/ipa_table.c
index d9538661755f4..401b568df6a34 100644
--- a/drivers/net/ipa/ipa_table.c
+++ b/drivers/net/ipa/ipa_table.c
@@ -27,28 +27,38 @@
 /**
  * DOC: IPA Filter and Route Tables
  *
- * The IPA has tables defined in its local shared memory that define filter
- * and routing rules.  Each entry in these tables contains a 64-bit DMA
- * address that refers to DRAM (system memory) containing a rule definition.
+ * The IPA has tables defined in its local (IPA-resident) memory that define
+ * filter and routing rules.  An entry in either of these tables is a little
+ * endian 64-bit "slot" that holds the address of a rule definition.  (The
+ * size of these slots is 64 bits regardless of the host DMA address size.)
+ *
+ * Separate tables (both filter and route) used for IPv4 and IPv6.  There
+ * are normally another set of "hashed" filter and route tables, which are
+ * used with a hash of message metadata.  Hashed operation is not supported
+ * by all IPA hardware (IPA v4.2 doesn't support hashed tables).
+ *
+ * Rules can be in local memory or in DRAM (system memory).  The offset of
+ * an object (such as a route or filter table) in IPA-resident memory must
+ * 128-byte aligned.  An object in system memory (such as a route or filter
+ * rule) must be at an 8-byte aligned address.  We currently only place
+ * route or filter rules in system memory.
+ *
  * A rule consists of a contiguous block of 32-bit values terminated with
  * 32 zero bits.  A special "zero entry" rule consisting of 64 zero bits
  * represents "no filtering" or "no routing," and is the reset value for
- * filter or route table rules.  Separate tables (both filter and route)
- * used for IPv4 and IPv6.  Additionally, there can be hashed filter or
- * route tables, which are used when a hash of message metadata matches.
- * Hashed operation is not supported by all IPA hardware.
+ * filter or route table rules.
  *
  * Each filter rule is associated with an AP or modem TX endpoint, though
- * not all TX endpoints support filtering.  The first 64-bit entry in a
+ * not all TX endpoints support filtering.  The first 64-bit slot in a
  * filter table is a bitmap indicating which endpoints have entries in
  * the table.  The low-order bit (bit 0) in this bitmap represents a
  * special global filter, which applies to all traffic.  This is not
  * used in the current code.  Bit 1, if set, indicates that there is an
- * entry (i.e. a DMA address referring to a rule) for endpoint 0 in the
- * table.  Bit 2, if set, indicates there is an entry for endpoint 1,
- * and so on.  Space is set aside in IPA local memory to hold as many
- * filter table entries as might be required, but typically they are not
- * all used.
+ * entry (i.e. slot containing a system address referring to a rule) for
+ * endpoint 0 in the table.  Bit 3, if set, indicates there is an entry
+ * for endpoint 2, and so on.  Space is set aside in IPA local memory to
+ * hold as many filter table entries as might be required, but typically
+ * they are not all used.
  *
  * The AP initializes all entries in a filter table to refer to a "zero"
  * entry.  Once initialized the modem and AP update the entries for
@@ -122,8 +132,7 @@ static void ipa_table_validate_build(void)
 	 * code in ipa_table_init() uses a pointer to __le64 to
 	 * initialize tables.
 	 */
-	BUILD_BUG_ON(sizeof(dma_addr_t) > IPA_TABLE_ENTRY_SIZE);
-	BUILD_BUG_ON(sizeof(__le64) != IPA_TABLE_ENTRY_SIZE);
+	BUILD_BUG_ON(sizeof(dma_addr_t) > sizeof(__le64));
 
 	/* A "zero rule" is used to represent no filtering or no routing.
 	 * It is a 64-bit block of zeroed memory.  Code in ipa_table_init()
@@ -154,7 +163,7 @@ ipa_table_valid_one(struct ipa *ipa, bool route, bool ipv6, bool hashed)
 		else
 			mem = hashed ? &ipa->mem[IPA_MEM_V4_ROUTE_HASHED]
 				     : &ipa->mem[IPA_MEM_V4_ROUTE];
-		size = IPA_ROUTE_COUNT_MAX * IPA_TABLE_ENTRY_SIZE;
+		size = IPA_ROUTE_COUNT_MAX * sizeof(__le64);
 	} else {
 		if (ipv6)
 			mem = hashed ? &ipa->mem[IPA_MEM_V6_FILTER_HASHED]
@@ -162,7 +171,7 @@ ipa_table_valid_one(struct ipa *ipa, bool route, bool ipv6, bool hashed)
 		else
 			mem = hashed ? &ipa->mem[IPA_MEM_V4_FILTER_HASHED]
 				     : &ipa->mem[IPA_MEM_V4_FILTER];
-		size = (1 + IPA_FILTER_COUNT_MAX) * IPA_TABLE_ENTRY_SIZE;
+		size = (1 + IPA_FILTER_COUNT_MAX) * sizeof(__le64);
 	}
 
 	if (!ipa_cmd_table_valid(ipa, mem, route, ipv6, hashed))
@@ -261,8 +270,8 @@ static void ipa_table_reset_add(struct gsi_trans *trans, bool filter,
 	if (filter)
 		first++;	/* skip over bitmap */
 
-	offset = mem->offset + first * IPA_TABLE_ENTRY_SIZE;
-	size = count * IPA_TABLE_ENTRY_SIZE;
+	offset = mem->offset + first * sizeof(__le64);
+	size = count * sizeof(__le64);
 	addr = ipa_table_addr(ipa, false, count);
 
 	ipa_cmd_dma_shared_mem_add(trans, offset, size, addr, true);
@@ -444,11 +453,11 @@ static void ipa_table_init_add(struct gsi_trans *trans, bool filter,
 		count = hweight32(ipa->filter_map);
 		hash_count = hash_mem->size ? count : 0;
 	} else {
-		count = mem->size / IPA_TABLE_ENTRY_SIZE;
-		hash_count = hash_mem->size / IPA_TABLE_ENTRY_SIZE;
+		count = mem->size / sizeof(__le64);
+		hash_count = hash_mem->size / sizeof(__le64);
 	}
-	size = count * IPA_TABLE_ENTRY_SIZE;
-	hash_size = hash_count * IPA_TABLE_ENTRY_SIZE;
+	size = count * sizeof(__le64);
+	hash_size = hash_count * sizeof(__le64);
 
 	addr = ipa_table_addr(ipa, filter, count);
 	hash_addr = ipa_table_addr(ipa, filter, hash_count);
@@ -655,7 +664,7 @@ int ipa_table_init(struct ipa *ipa)
 	 * by dma_alloc_coherent() is guaranteed to be a power-of-2 number
 	 * of pages, which satisfies the rule alignment requirement.
 	 */
-	size = IPA_ZERO_RULE_SIZE + (1 + count) * IPA_TABLE_ENTRY_SIZE;
+	size = IPA_ZERO_RULE_SIZE + (1 + count) * sizeof(__le64);
 	virt = dma_alloc_coherent(dev, size, &addr, GFP_KERNEL);
 	if (!virt)
 		return -ENOMEM;
@@ -687,7 +696,7 @@ void ipa_table_exit(struct ipa *ipa)
 	struct device *dev = &ipa->pdev->dev;
 	size_t size;
 
-	size = IPA_ZERO_RULE_SIZE + (1 + count) * IPA_TABLE_ENTRY_SIZE;
+	size = IPA_ZERO_RULE_SIZE + (1 + count) * sizeof(__le64);
 
 	dma_free_coherent(dev, size, ipa->table_virt, ipa->table_addr);
 	ipa->table_addr = 0;
diff --git a/drivers/net/ipa/ipa_table.h b/drivers/net/ipa/ipa_table.h
index e14108ed62bdd..018045b95aad8 100644
--- a/drivers/net/ipa/ipa_table.h
+++ b/drivers/net/ipa/ipa_table.h
@@ -10,9 +10,6 @@
 
 struct ipa;
 
-/* The size of a filter or route table entry */
-#define IPA_TABLE_ENTRY_SIZE	sizeof(__le64)	/* Holds a physical address */
-
 /* The maximum number of filter table entries (IPv4, IPv6; hashed or not) */
 #define IPA_FILTER_COUNT_MAX	14
 
-- 
2.27.0