[PATCH net-next 0/8] net: ipa: memory region rework, part 2

[PATCH net-next 0/8] net: ipa: memory region rework, part 2

[Alex Elder]

This is the second portion of a set of patches updating the IPA
memory region code.

In this portion (part 2), the focus is on adjusting the code so that
it no longer assumes the memory region descriptor array is indexed
by the region identifier.  This brings with it some related cleanup.

Three loops are changed so their loop index variable is an unsigned
rather than an enumerated type.

A set of functions is changed so a region identifier (rather than a
memory region descriptor pointer) is passed as argument, to simplify
their call sites.  This isn't entirely related or required, but I
think it improves the code.

A validation function for filter and route table memory regions is
changed to take memory region IDs, rather than determining which
region to validate based on a set of Boolean flags.

Finally, ipa_mem_find() is created to abstract getting a memory
descriptor based on its ID, and it is used everywhere rather than
indexing the array.  With that implemented, all of the memory
regions can be defined by arrays of entries defined without
providing index designators.

					-Alex

Alex Elder (8):
  net: ipa: don't assume mem array indexed by ID
  net: ipa: clean up header memory validation
  net: ipa: pass mem_id to ipa_filter_reset_table()
  net: ipa: pass mem ID to ipa_mem_zero_region_add()
  net: ipa: pass mem_id to ipa_table_reset_add()
  net: ipa: pass memory id to ipa_table_valid_one()
  net: ipa: introduce ipa_mem_find()
  net: ipa: don't index mem data array by ID

 drivers/net/ipa/ipa_cmd.c         |  50 +++++++++-----
 drivers/net/ipa/ipa_data-v3.5.1.c |  30 ++++-----
 drivers/net/ipa/ipa_data-v4.11.c  |  44 ++++++------
 drivers/net/ipa/ipa_data-v4.2.c   |  36 +++++-----
 drivers/net/ipa/ipa_data-v4.5.c   |  46 ++++++-------
 drivers/net/ipa/ipa_data-v4.9.c   |  46 ++++++-------
 drivers/net/ipa/ipa_mem.c         | 108 ++++++++++++++++--------------
 drivers/net/ipa/ipa_mem.h         |   3 +-
 drivers/net/ipa/ipa_qmi.c         |  32 ++++-----
 drivers/net/ipa/ipa_table.c       |  94 ++++++++++----------------
 drivers/net/ipa/ipa_uc.c          |   3 +-
 11 files changed, 247 insertions(+), 245 deletions(-)

-- 
2.27.0

[PATCH net-next 1/8] net: ipa: don't assume mem array indexed by ID

[Alex Elder]

Change ipa_mem_valid() to iterate over the entries using a u32 index
variable rather than using a memory region ID.  Use the ID found
inside the memory descriptor rather than the loop index.

Change ipa_mem_size_valid() to iterate over the entries but without
assuming the array index is the memory region ID.  "Empty" entries
will have zero size; and we'll temporarily assume such entries have
zero offset as well (they all do, currently).

Similarly, don't assume the mem[] array is indexed by ID in
ipa_mem_config().  There, "empty" entries will have a zero canary
count, so no special assumptions are needed to handle them correctly.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_mem.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ipa/ipa_mem.c b/drivers/net/ipa/ipa_mem.c
index ef9fdd3b88750..9e504ec278179 100644
--- a/drivers/net/ipa/ipa_mem.c
+++ b/drivers/net/ipa/ipa_mem.c
@@ -220,6 +220,7 @@ static bool ipa_mem_valid(struct ipa *ipa, const struct ipa_mem_data *mem_data)
 	DECLARE_BITMAP(regions, IPA_MEM_COUNT) = { };
 	struct device *dev = &ipa->pdev->dev;
 	enum ipa_mem_id mem_id;
+	u32 i;
 
 	if (mem_data->local_count > IPA_MEM_COUNT) {
 		dev_err(dev, "too many memory regions (%u > %u)\n",
@@ -227,10 +228,10 @@ static bool ipa_mem_valid(struct ipa *ipa, const struct ipa_mem_data *mem_data)
 		return false;
 	}
 
-	for (mem_id = 0; mem_id < mem_data->local_count; mem_id++) {
-		const struct ipa_mem *mem = &mem_data->local[mem_id];
+	for (i = 0; i < mem_data->local_count; i++) {
+		const struct ipa_mem *mem = &mem_data->local[i];
 
-		if (mem_id == IPA_MEM_UNDEFINED)
+		if (mem->id == IPA_MEM_UNDEFINED)
 			continue;
 
 		if (__test_and_set_bit(mem->id, regions)) {
@@ -248,7 +249,7 @@ static bool ipa_mem_valid(struct ipa *ipa, const struct ipa_mem_data *mem_data)
 		/* It's harmless, but warn if an offset is provided */
 		if (mem->offset)
 			dev_warn(dev, "empty region %u has non-zero offset\n",
-				 mem_id);
+				 mem->id);
 	}
 
 	/* Now see if any required regions are not defined */
@@ -268,16 +269,16 @@ static bool ipa_mem_size_valid(struct ipa *ipa)
 {
 	struct device *dev = &ipa->pdev->dev;
 	u32 limit = ipa->mem_size;
-	enum ipa_mem_id mem_id;
+	u32 i;
 
-	for (mem_id = 0; mem_id < ipa->mem_count; mem_id++) {
-		const struct ipa_mem *mem = &ipa->mem[mem_id];
+	for (i = 0; i < ipa->mem_count; i++) {
+		const struct ipa_mem *mem = &ipa->mem[i];
 
 		if (mem->offset + mem->size <= limit)
 			continue;
 
 		dev_err(dev, "region %u ends beyond memory limit (0x%08x)\n",
-			mem_id, limit);
+			mem->id, limit);
 
 		return false;
 	}
@@ -294,11 +295,11 @@ static bool ipa_mem_size_valid(struct ipa *ipa)
 int ipa_mem_config(struct ipa *ipa)
 {
 	struct device *dev = &ipa->pdev->dev;
-	enum ipa_mem_id mem_id;
 	dma_addr_t addr;
 	u32 mem_size;
 	void *virt;
 	u32 val;
+	u32 i;
 
 	/* Check the advertised location and size of the shared memory area */
 	val = ioread32(ipa->reg_virt + IPA_REG_SHARED_MEM_SIZE_OFFSET);
@@ -330,11 +331,11 @@ int ipa_mem_config(struct ipa *ipa)
 	ipa->zero_virt = virt;
 	ipa->zero_size = IPA_MEM_MAX;
 
-	/* For each region, write "canary" values in the space prior to
-	 * the region's base address if indicated.
+	/* For each defined region, write "canary" values in the
+	 * space prior to the region's base address if indicated.
 	 */
-	for (mem_id = 0; mem_id < ipa->mem_count; mem_id++) {
-		const struct ipa_mem *mem = &ipa->mem[mem_id];
+	for (i = 0; i < ipa->mem_count; i++) {
+		const struct ipa_mem *mem = &ipa->mem[i];
 		u16 canary_count;
 		__le32 *canary;
 
-- 
2.27.0

[PATCH net-next 2/8] net: ipa: clean up header memory validation

[Alex Elder]

Do some general cleanup in ipa_cmd_header_valid():
  - Delay assigning the mem variable until just before it's used.
  - Assign the maximum offset and size values together.
  - Improve comments explaining the single range of memory being
    made up of a modem portion and an AP portion.
  - Record the offset of the combined range in a local variable.
  - Do the initial size assignment right after assigning the offset.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_cmd.c | 46 ++++++++++++++++++++++++---------------
 1 file changed, 29 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ipa/ipa_cmd.c b/drivers/net/ipa/ipa_cmd.c
index 525cdf28d9ea7..3e5f10d3c131d 100644
--- a/drivers/net/ipa/ipa_cmd.c
+++ b/drivers/net/ipa/ipa_cmd.c
@@ -200,41 +200,53 @@ bool ipa_cmd_table_valid(struct ipa *ipa, const struct ipa_mem *mem,
 /* Validate the memory region that holds headers */
 static bool ipa_cmd_header_valid(struct ipa *ipa)
 {
-	const struct ipa_mem *mem = &ipa->mem[IPA_MEM_MODEM_HEADER];
 	struct device *dev = &ipa->pdev->dev;
+	const struct ipa_mem *mem;
 	u32 offset_max;
 	u32 size_max;
+	u32 offset;
 	u32 size;
 
-	/* In ipa_cmd_hdr_init_local_add() we record the offset and size
-	 * of the header table memory area.  Make sure the offset and size
-	 * fit in the fields that need to hold them, and that the entire
-	 * range is within the overall IPA memory range.
+	/* In ipa_cmd_hdr_init_local_add() we record the offset and size of
+	 * the header table memory area in an immediate command.  Make sure
+	 * the offset and size fit in the fields that need to hold them, and
+	 * that the entire range is within the overall IPA memory range.
 	 */
 	offset_max = field_max(HDR_INIT_LOCAL_FLAGS_HDR_ADDR_FMASK);
-	if (mem->offset > offset_max ||
-	    ipa->mem_offset > offset_max - mem->offset) {
-		dev_err(dev, "header table region offset too large\n");
-		dev_err(dev, "    (0x%04x + 0x%04x > 0x%04x)\n",
-			ipa->mem_offset, mem->offset, offset_max);
-
-		return false;
-	}
-
 	size_max = field_max(HDR_INIT_LOCAL_FLAGS_TABLE_SIZE_FMASK);
-	size = ipa->mem[IPA_MEM_MODEM_HEADER].size;
+
+	/* The header memory area contains both the modem and AP header
+	 * regions.  The modem portion defines the address of the region.
+	 */
+	mem = &ipa->mem[IPA_MEM_MODEM_HEADER];
+	offset = mem->offset;
+	size = mem->size;
+
+	/* Make sure the offset fits in the IPA command */
+	if (offset > offset_max || ipa->mem_offset > offset_max - offset) {
+		dev_err(dev, "header table region offset too large\n");
+		dev_err(dev, "    (0x%04x + 0x%04x > 0x%04x)\n",
+			ipa->mem_offset, offset, offset_max);
+
+		return false;
+	}
+
+	/* Add the size of the AP portion to the combined size */
 	size += ipa->mem[IPA_MEM_AP_HEADER].size;
 
+	/* Make sure the combined size fits in the IPA command */
 	if (size > size_max) {
 		dev_err(dev, "header table region size too large\n");
 		dev_err(dev, "    (0x%04x > 0x%08x)\n", size, size_max);
 
 		return false;
 	}
-	if (size > ipa->mem_size || mem->offset > ipa->mem_size - size) {
+
+	/* Make sure the entire combined area fits in IPA memory */
+	if (size > ipa->mem_size || offset > ipa->mem_size - size) {
 		dev_err(dev, "header table region out of range\n");
 		dev_err(dev, "    (0x%04x + 0x%04x > 0x%04x)\n",
-			mem->offset, size, ipa->mem_size);
+			offset, size, ipa->mem_size);
 
 		return false;
 	}
-- 
2.27.0

[PATCH net-next 3/8] net: ipa: pass mem_id to ipa_filter_reset_table()

[Alex Elder]

Pass a memory region ID rather than the address of a memory region
descriptor to ipa_filter_reset_table(), to simplify callers.

We can eliminate the check for a zero region size in this function
because ipa_table_reset_add() checks that before adding anything to
the transaction.

Note that here and in subsequent commits there is no need to check
whether a memory region exists, because we will have already
verified that during initialization.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_table.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ipa/ipa_table.c b/drivers/net/ipa/ipa_table.c
index 3168d72f42450..95a4c2aceb010 100644
--- a/drivers/net/ipa/ipa_table.c
+++ b/drivers/net/ipa/ipa_table.c
@@ -282,16 +282,14 @@ static void ipa_table_reset_add(struct gsi_trans *trans, bool filter,
  * for the IPv4 and IPv6 non-hashed and hashed filter tables.
  */
 static int
-ipa_filter_reset_table(struct ipa *ipa, const struct ipa_mem *mem, bool modem)
+ipa_filter_reset_table(struct ipa *ipa, enum ipa_mem_id mem_id, bool modem)
 {
+	const struct ipa_mem *mem = &ipa->mem[mem_id];
 	u32 ep_mask = ipa->filter_map;
 	u32 count = hweight32(ep_mask);
 	struct gsi_trans *trans;
 	enum gsi_ee_id ee_id;
 
-	if (!mem->size)
-		return 0;
-
 	trans = ipa_cmd_trans_alloc(ipa, count);
 	if (!trans) {
 		dev_err(&ipa->pdev->dev,
@@ -327,20 +325,18 @@ static int ipa_filter_reset(struct ipa *ipa, bool modem)
 {
 	int ret;
 
-	ret = ipa_filter_reset_table(ipa, &ipa->mem[IPA_MEM_V4_FILTER], modem);
+	ret = ipa_filter_reset_table(ipa, IPA_MEM_V4_FILTER, modem);
 	if (ret)
 		return ret;
 
-	ret = ipa_filter_reset_table(ipa, &ipa->mem[IPA_MEM_V4_FILTER_HASHED],
-				     modem);
+	ret = ipa_filter_reset_table(ipa, IPA_MEM_V4_FILTER_HASHED, modem);
 	if (ret)
 		return ret;
 
-	ret = ipa_filter_reset_table(ipa, &ipa->mem[IPA_MEM_V6_FILTER], modem);
+	ret = ipa_filter_reset_table(ipa, IPA_MEM_V6_FILTER, modem);
 	if (ret)
 		return ret;
-	ret = ipa_filter_reset_table(ipa, &ipa->mem[IPA_MEM_V6_FILTER_HASHED],
-				     modem);
+	ret = ipa_filter_reset_table(ipa, IPA_MEM_V6_FILTER_HASHED, modem);
 
 	return ret;
 }
-- 
2.27.0

[PATCH net-next 4/8] net: ipa: pass mem ID to ipa_mem_zero_region_add()

[Alex Elder]

Pass a memory region ID rather than the address of a memory region
descriptor to ipa_mem_zero_region_add() to simplify callers.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_mem.c | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ipa/ipa_mem.c b/drivers/net/ipa/ipa_mem.c
index 9e504ec278179..7df5496bdc2e4 100644
--- a/drivers/net/ipa/ipa_mem.c
+++ b/drivers/net/ipa/ipa_mem.c
@@ -28,9 +28,10 @@
 
 /* Add an immediate command to a transaction that zeroes a memory region */
 static void
-ipa_mem_zero_region_add(struct gsi_trans *trans, const struct ipa_mem *mem)
+ipa_mem_zero_region_add(struct gsi_trans *trans, enum ipa_mem_id mem_id)
 {
 	struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
+	const struct ipa_mem *mem = &ipa->mem[mem_id];
 	dma_addr_t addr = ipa->zero_addr;
 
 	if (!mem->size)
@@ -83,11 +84,9 @@ int ipa_mem_setup(struct ipa *ipa)
 
 	ipa_cmd_hdr_init_local_add(trans, offset, size, addr);
 
-	ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_MODEM_PROC_CTX]);
-
-	ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_AP_PROC_CTX]);
-
-	ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_MODEM]);
+	ipa_mem_zero_region_add(trans, IPA_MEM_MODEM_PROC_CTX);
+	ipa_mem_zero_region_add(trans, IPA_MEM_AP_PROC_CTX);
+	ipa_mem_zero_region_add(trans, IPA_MEM_MODEM);
 
 	gsi_trans_commit_wait(trans);
 
@@ -411,11 +410,9 @@ int ipa_mem_zero_modem(struct ipa *ipa)
 		return -EBUSY;
 	}
 
-	ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_MODEM_HEADER]);
-
-	ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_MODEM_PROC_CTX]);
-
-	ipa_mem_zero_region_add(trans, &ipa->mem[IPA_MEM_MODEM]);
+	ipa_mem_zero_region_add(trans, IPA_MEM_MODEM_HEADER);
+	ipa_mem_zero_region_add(trans, IPA_MEM_MODEM_PROC_CTX);
+	ipa_mem_zero_region_add(trans, IPA_MEM_MODEM);
 
 	gsi_trans_commit_wait(trans);
 
-- 
2.27.0

[PATCH net-next 5/8] net: ipa: pass mem_id to ipa_table_reset_add()

[Alex Elder]

Pass a memory region ID rather than the address of a memory region
descriptor to ipa_table_reset_add() to simplify callers.  Similarly,
pass memory region IDs to ipa_table_init_add().

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_table.c | 36 ++++++++++++++++--------------------
 1 file changed, 16 insertions(+), 20 deletions(-)

diff --git a/drivers/net/ipa/ipa_table.c b/drivers/net/ipa/ipa_table.c
index 95a4c2aceb010..f7ee75bfba748 100644
--- a/drivers/net/ipa/ipa_table.c
+++ b/drivers/net/ipa/ipa_table.c
@@ -256,14 +256,15 @@ static dma_addr_t ipa_table_addr(struct ipa *ipa, bool filter_mask, u16 count)
 }
 
 static void ipa_table_reset_add(struct gsi_trans *trans, bool filter,
-				u16 first, u16 count, const struct ipa_mem *mem)
+				u16 first, u16 count, enum ipa_mem_id mem_id)
 {
 	struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
+	const struct ipa_mem *mem = &ipa->mem[mem_id];
 	dma_addr_t addr;
 	u32 offset;
 	u16 size;
 
-	/* Nothing to do if the table memory regions is empty */
+	/* Nothing to do if the table memory region is empty */
 	if (!mem->size)
 		return;
 
@@ -284,7 +285,6 @@ static void ipa_table_reset_add(struct gsi_trans *trans, bool filter,
 static int
 ipa_filter_reset_table(struct ipa *ipa, enum ipa_mem_id mem_id, bool modem)
 {
-	const struct ipa_mem *mem = &ipa->mem[mem_id];
 	u32 ep_mask = ipa->filter_map;
 	u32 count = hweight32(ep_mask);
 	struct gsi_trans *trans;
@@ -309,7 +309,7 @@ ipa_filter_reset_table(struct ipa *ipa, enum ipa_mem_id mem_id, bool modem)
 		if (endpoint->ee_id != ee_id)
 			continue;
 
-		ipa_table_reset_add(trans, true, endpoint_id, 1, mem);
+		ipa_table_reset_add(trans, true, endpoint_id, 1, mem_id);
 	}
 
 	gsi_trans_commit_wait(trans);
@@ -367,15 +367,13 @@ static int ipa_route_reset(struct ipa *ipa, bool modem)
 		count = IPA_ROUTE_AP_COUNT;
 	}
 
+	ipa_table_reset_add(trans, false, first, count, IPA_MEM_V4_ROUTE);
 	ipa_table_reset_add(trans, false, first, count,
-			    &ipa->mem[IPA_MEM_V4_ROUTE]);
-	ipa_table_reset_add(trans, false, first, count,
-			    &ipa->mem[IPA_MEM_V4_ROUTE_HASHED]);
+			    IPA_MEM_V4_ROUTE_HASHED);
 
+	ipa_table_reset_add(trans, false, first, count, IPA_MEM_V6_ROUTE);
 	ipa_table_reset_add(trans, false, first, count,
-			    &ipa->mem[IPA_MEM_V6_ROUTE]);
-	ipa_table_reset_add(trans, false, first, count,
-			    &ipa->mem[IPA_MEM_V6_ROUTE_HASHED]);
+			    IPA_MEM_V6_ROUTE_HASHED);
 
 	gsi_trans_commit_wait(trans);
 
@@ -429,10 +427,12 @@ int ipa_table_hash_flush(struct ipa *ipa)
 
 static void ipa_table_init_add(struct gsi_trans *trans, bool filter,
 			       enum ipa_cmd_opcode opcode,
-			       const struct ipa_mem *mem,
-			       const struct ipa_mem *hash_mem)
+			       enum ipa_mem_id mem_id,
+			       enum ipa_mem_id hash_mem_id)
 {
 	struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
+	const struct ipa_mem *hash_mem = &ipa->mem[hash_mem_id];
+	const struct ipa_mem *mem = &ipa->mem[mem_id];
 	dma_addr_t hash_addr;
 	dma_addr_t addr;
 	u16 hash_count;
@@ -473,20 +473,16 @@ int ipa_table_setup(struct ipa *ipa)
 	}
 
 	ipa_table_init_add(trans, false, IPA_CMD_IP_V4_ROUTING_INIT,
-			   &ipa->mem[IPA_MEM_V4_ROUTE],
-			   &ipa->mem[IPA_MEM_V4_ROUTE_HASHED]);
+			   IPA_MEM_V4_ROUTE, IPA_MEM_V4_ROUTE_HASHED);
 
 	ipa_table_init_add(trans, false, IPA_CMD_IP_V6_ROUTING_INIT,
-			   &ipa->mem[IPA_MEM_V6_ROUTE],
-			   &ipa->mem[IPA_MEM_V6_ROUTE_HASHED]);
+			   IPA_MEM_V6_ROUTE, IPA_MEM_V6_ROUTE_HASHED);
 
 	ipa_table_init_add(trans, true, IPA_CMD_IP_V4_FILTER_INIT,
-			   &ipa->mem[IPA_MEM_V4_FILTER],
-			   &ipa->mem[IPA_MEM_V4_FILTER_HASHED]);
+			   IPA_MEM_V4_FILTER, IPA_MEM_V4_FILTER_HASHED);
 
 	ipa_table_init_add(trans, true, IPA_CMD_IP_V6_FILTER_INIT,
-			   &ipa->mem[IPA_MEM_V6_FILTER],
-			   &ipa->mem[IPA_MEM_V6_FILTER_HASHED]);
+			   IPA_MEM_V6_FILTER, IPA_MEM_V6_FILTER_HASHED);
 
 	gsi_trans_commit_wait(trans);
 
-- 
2.27.0

[PATCH net-next 6/8] net: ipa: pass memory id to ipa_table_valid_one()

[Alex Elder]

Stop passing most of the Boolean flags to ipa_table_valid_one(), and
just pass a memory region ID to it instead.  We still need to
indicate whether we're operating on a routing or filter table.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_table.c | 44 +++++++++++++------------------------
 1 file changed, 15 insertions(+), 29 deletions(-)

diff --git a/drivers/net/ipa/ipa_table.c b/drivers/net/ipa/ipa_table.c
index f7ee75bfba748..679855b1d5495 100644
--- a/drivers/net/ipa/ipa_table.c
+++ b/drivers/net/ipa/ipa_table.c
@@ -150,29 +150,16 @@ static void ipa_table_validate_build(void)
 }
 
 static bool
-ipa_table_valid_one(struct ipa *ipa, bool route, bool ipv6, bool hashed)
+ipa_table_valid_one(struct ipa *ipa, enum ipa_mem_id mem_id, bool route)
 {
+	const struct ipa_mem *mem = &ipa->mem[mem_id];
 	struct device *dev = &ipa->pdev->dev;
-	const struct ipa_mem *mem;
 	u32 size;
 
-	if (route) {
-		if (ipv6)
-			mem = hashed ? &ipa->mem[IPA_MEM_V6_ROUTE_HASHED]
-				     : &ipa->mem[IPA_MEM_V6_ROUTE];
-		else
-			mem = hashed ? &ipa->mem[IPA_MEM_V4_ROUTE_HASHED]
-				     : &ipa->mem[IPA_MEM_V4_ROUTE];
+	if (route)
 		size = IPA_ROUTE_COUNT_MAX * sizeof(__le64);
-	} else {
-		if (ipv6)
-			mem = hashed ? &ipa->mem[IPA_MEM_V6_FILTER_HASHED]
-				     : &ipa->mem[IPA_MEM_V6_FILTER];
-		else
-			mem = hashed ? &ipa->mem[IPA_MEM_V4_FILTER_HASHED]
-				     : &ipa->mem[IPA_MEM_V4_FILTER];
+	else
 		size = (1 + IPA_FILTER_COUNT_MAX) * sizeof(__le64);
-	}
 
 	if (!ipa_cmd_table_valid(ipa, mem, route, ipv6, hashed))
 		return false;
@@ -185,9 +172,8 @@ ipa_table_valid_one(struct ipa *ipa, bool route, bool ipv6, bool hashed)
 	if (hashed && !mem->size)
 		return true;
 
-	dev_err(dev, "IPv%c %s%s table region size 0x%02x, expected 0x%02x\n",
-		ipv6 ? '6' : '4', hashed ? "hashed " : "",
-		route ? "route" : "filter", mem->size, size);
+	dev_err(dev, "%s table region %u size 0x%02x, expected 0x%02x\n",
+		route ? "route" : "filter", mem_id, mem->size, size);
 
 	return false;
 }
@@ -195,16 +181,16 @@ ipa_table_valid_one(struct ipa *ipa, bool route, bool ipv6, bool hashed)
 /* Verify the filter and route table memory regions are the expected size */
 bool ipa_table_valid(struct ipa *ipa)
 {
-	bool valid = true;
+	bool valid;
 
-	valid = valid && ipa_table_valid_one(ipa, false, false, false);
-	valid = valid && ipa_table_valid_one(ipa, false, false, true);
-	valid = valid && ipa_table_valid_one(ipa, false, true, false);
-	valid = valid && ipa_table_valid_one(ipa, false, true, true);
-	valid = valid && ipa_table_valid_one(ipa, true, false, false);
-	valid = valid && ipa_table_valid_one(ipa, true, false, true);
-	valid = valid && ipa_table_valid_one(ipa, true, true, false);
-	valid = valid && ipa_table_valid_one(ipa, true, true, true);
+	valid = ipa_table_valid_one(IPA_MEM_V4_FILTER, false);
+	valid = valid && ipa_table_valid_one(IPA_MEM_V4_FILTER_HASHED, false);
+	valid = valid && ipa_table_valid_one(IPA_MEM_V6_FILTER, false);
+	valid = valid && ipa_table_valid_one(IPA_MEM_V6_FILTER_HASHED, false);
+	valid = valid && ipa_table_valid_one(IPA_MEM_V4_ROUTE, true);
+	valid = valid && ipa_table_valid_one(IPA_MEM_V4_ROUTE_HASHED, true);
+	valid = valid && ipa_table_valid_one(IPA_MEM_V6_ROUTE, true);
+	valid = valid && ipa_table_valid_one(IPA_MEM_V6_ROUTE_HASHED, true);
 
 	return valid;
 }
-- 
2.27.0

[PATCH net-next 7/8] net: ipa: introduce ipa_mem_find()

[Alex Elder]

Introduce a new function that abstracts finding information about a
region in IPA-local memory, given its memory region ID.  For now it
simply uses the region ID as an index into the IPA memory array.
If the region is not defined, ipa_mem_find() returns a null pointer.

Update all code that accesses the ipa->mem[] array directly to use
ipa_mem_find() instead.  The return value must be checked for null
when optional memory regions are sought.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_cmd.c   |  8 +++++---
 drivers/net/ipa/ipa_mem.c   | 38 ++++++++++++++++++++++++++-----------
 drivers/net/ipa/ipa_mem.h   |  2 ++
 drivers/net/ipa/ipa_qmi.c   | 32 +++++++++++++++----------------
 drivers/net/ipa/ipa_table.c |  8 ++++----
 drivers/net/ipa/ipa_uc.c    |  3 ++-
 6 files changed, 56 insertions(+), 35 deletions(-)

diff --git a/drivers/net/ipa/ipa_cmd.c b/drivers/net/ipa/ipa_cmd.c
index 3e5f10d3c131d..af44ca41189e3 100644
--- a/drivers/net/ipa/ipa_cmd.c
+++ b/drivers/net/ipa/ipa_cmd.c
@@ -218,7 +218,7 @@ static bool ipa_cmd_header_valid(struct ipa *ipa)
 	/* The header memory area contains both the modem and AP header
 	 * regions.  The modem portion defines the address of the region.
 	 */
-	mem = &ipa->mem[IPA_MEM_MODEM_HEADER];
+	mem = ipa_mem_find(ipa, IPA_MEM_MODEM_HEADER);
 	offset = mem->offset;
 	size = mem->size;
 
@@ -231,8 +231,10 @@ static bool ipa_cmd_header_valid(struct ipa *ipa)
 		return false;
 	}
 
-	/* Add the size of the AP portion to the combined size */
-	size += ipa->mem[IPA_MEM_AP_HEADER].size;
+	/* Add the size of the AP portion (if defined) to the combined size */
+	mem = ipa_mem_find(ipa, IPA_MEM_AP_HEADER);
+	if (mem)
+		size += mem->size;
 
 	/* Make sure the combined size fits in the IPA command */
 	if (size > size_max) {
diff --git a/drivers/net/ipa/ipa_mem.c b/drivers/net/ipa/ipa_mem.c
index 7df5496bdc2e4..633895fc67b66 100644
--- a/drivers/net/ipa/ipa_mem.c
+++ b/drivers/net/ipa/ipa_mem.c
@@ -26,12 +26,20 @@
 /* SMEM host id representing the modem. */
 #define QCOM_SMEM_HOST_MODEM	1
 
+const struct ipa_mem *ipa_mem_find(struct ipa *ipa, enum ipa_mem_id mem_id)
+{
+	if (mem_id < IPA_MEM_COUNT)
+		return &ipa->mem[mem_id];
+
+	return NULL;
+}
+
 /* Add an immediate command to a transaction that zeroes a memory region */
 static void
 ipa_mem_zero_region_add(struct gsi_trans *trans, enum ipa_mem_id mem_id)
 {
 	struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
-	const struct ipa_mem *mem = &ipa->mem[mem_id];
+	const struct ipa_mem *mem = ipa_mem_find(ipa, mem_id);
 	dma_addr_t addr = ipa->zero_addr;
 
 	if (!mem->size)
@@ -61,6 +69,7 @@ ipa_mem_zero_region_add(struct gsi_trans *trans, enum ipa_mem_id mem_id)
 int ipa_mem_setup(struct ipa *ipa)
 {
 	dma_addr_t addr = ipa->zero_addr;
+	const struct ipa_mem *mem;
 	struct gsi_trans *trans;
 	u32 offset;
 	u16 size;
@@ -75,12 +84,16 @@ int ipa_mem_setup(struct ipa *ipa)
 		return -EBUSY;
 	}
 
-	/* Initialize IPA-local header memory.  The modem and AP header
-	 * regions are contiguous, and initialized together.
+	/* Initialize IPA-local header memory.  The AP header region, if
+	 * present, is contiguous with and follows the modem header region,
+	 * and they are initialized together.
 	 */
-	offset = ipa->mem[IPA_MEM_MODEM_HEADER].offset;
-	size = ipa->mem[IPA_MEM_MODEM_HEADER].size;
-	size += ipa->mem[IPA_MEM_AP_HEADER].size;
+	mem = ipa_mem_find(ipa, IPA_MEM_MODEM_HEADER);
+	offset = mem->offset;
+	size = mem->size;
+	mem = ipa_mem_find(ipa, IPA_MEM_AP_HEADER);
+	if (mem)
+		size += mem->size;
 
 	ipa_cmd_hdr_init_local_add(trans, offset, size, addr);
 
@@ -91,7 +104,8 @@ int ipa_mem_setup(struct ipa *ipa)
 	gsi_trans_commit_wait(trans);
 
 	/* Tell the hardware where the processing context area is located */
-	offset = ipa->mem_offset + ipa->mem[IPA_MEM_MODEM_PROC_CTX].offset;
+	mem = ipa_mem_find(ipa, IPA_MEM_MODEM_PROC_CTX);
+	offset = ipa->mem_offset + mem->offset;
 	val = proc_cntxt_base_addr_encoded(ipa->version, offset);
 	iowrite32(val, ipa->reg_virt + IPA_REG_LOCAL_PKT_PROC_CNTXT_OFFSET);
 
@@ -294,6 +308,7 @@ static bool ipa_mem_size_valid(struct ipa *ipa)
 int ipa_mem_config(struct ipa *ipa)
 {
 	struct device *dev = &ipa->pdev->dev;
+	const struct ipa_mem *mem;
 	dma_addr_t addr;
 	u32 mem_size;
 	void *virt;
@@ -334,11 +349,11 @@ int ipa_mem_config(struct ipa *ipa)
 	 * space prior to the region's base address if indicated.
 	 */
 	for (i = 0; i < ipa->mem_count; i++) {
-		const struct ipa_mem *mem = &ipa->mem[i];
 		u16 canary_count;
 		__le32 *canary;
 
 		/* Skip over undefined regions */
+		mem = &ipa->mem[i];
 		if (!mem->offset && !mem->size)
 			continue;
 
@@ -361,8 +376,9 @@ int ipa_mem_config(struct ipa *ipa)
 	if (!ipa_cmd_data_valid(ipa))
 		goto err_dma_free;
 
-	/* Verify the microcontroller ring alignment (0 is OK too) */
-	if (ipa->mem[IPA_MEM_UC_EVENT_RING].offset % 1024) {
+	/* Verify the microcontroller ring alignment (if defined) */
+	mem = ipa_mem_find(ipa, IPA_MEM_UC_EVENT_RING);
+	if (mem && mem->offset % 1024) {
 		dev_err(dev, "microcontroller ring not 1024-byte aligned\n");
 		goto err_dma_free;
 	}
@@ -527,7 +543,7 @@ static int ipa_smem_init(struct ipa *ipa, u32 item, size_t size)
 	 * (in this case, the modem).  An allocation from SMEM is persistent
 	 * until the AP reboots; there is no way to free an allocated SMEM
 	 * region.  Allocation only reserves the space; to use it you need
-	 * to "get" a pointer it (this implies no reference counting).
+	 * to "get" a pointer it (this does not imply reference counting).
 	 * The item might have already been allocated, in which case we
 	 * use it unless the size isn't what we expect.
 	 */
diff --git a/drivers/net/ipa/ipa_mem.h b/drivers/net/ipa/ipa_mem.h
index effe01f7310a2..712b2881be0c2 100644
--- a/drivers/net/ipa/ipa_mem.h
+++ b/drivers/net/ipa/ipa_mem.h
@@ -90,6 +90,8 @@ struct ipa_mem {
 	u16 canary_count;
 };
 
+const struct ipa_mem *ipa_mem_find(struct ipa *ipa, enum ipa_mem_id mem_id);
+
 int ipa_mem_config(struct ipa *ipa);
 void ipa_mem_deconfig(struct ipa *ipa);
 
diff --git a/drivers/net/ipa/ipa_qmi.c b/drivers/net/ipa/ipa_qmi.c
index 593665efbcf99..4661105ce7ab2 100644
--- a/drivers/net/ipa/ipa_qmi.c
+++ b/drivers/net/ipa/ipa_qmi.c
@@ -298,32 +298,32 @@ init_modem_driver_req(struct ipa_qmi *ipa_qmi)
 	req.platform_type_valid = 1;
 	req.platform_type = IPA_QMI_PLATFORM_TYPE_MSM_ANDROID;
 
-	mem = &ipa->mem[IPA_MEM_MODEM_HEADER];
+	mem = ipa_mem_find(ipa, IPA_MEM_MODEM_HEADER);
 	if (mem->size) {
 		req.hdr_tbl_info_valid = 1;
 		req.hdr_tbl_info.start = ipa->mem_offset + mem->offset;
 		req.hdr_tbl_info.end = req.hdr_tbl_info.start + mem->size - 1;
 	}
 
-	mem = &ipa->mem[IPA_MEM_V4_ROUTE];
+	mem = ipa_mem_find(ipa, 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 / sizeof(__le64);
 
-	mem = &ipa->mem[IPA_MEM_V6_ROUTE];
+	mem = ipa_mem_find(ipa, 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 / sizeof(__le64);
 
-	mem = &ipa->mem[IPA_MEM_V4_FILTER];
+	mem = ipa_mem_find(ipa, IPA_MEM_V4_FILTER);
 	req.v4_filter_tbl_start_valid = 1;
 	req.v4_filter_tbl_start = ipa->mem_offset + mem->offset;
 
-	mem = &ipa->mem[IPA_MEM_V6_FILTER];
+	mem = ipa_mem_find(ipa, IPA_MEM_V6_FILTER);
 	req.v6_filter_tbl_start_valid = 1;
 	req.v6_filter_tbl_start = ipa->mem_offset + mem->offset;
 
-	mem = &ipa->mem[IPA_MEM_MODEM];
+	mem = ipa_mem_find(ipa, IPA_MEM_MODEM);
 	if (mem->size) {
 		req.modem_mem_info_valid = 1;
 		req.modem_mem_info.start = ipa->mem_offset + mem->offset;
@@ -336,7 +336,7 @@ init_modem_driver_req(struct ipa_qmi *ipa_qmi)
 
 	/* skip_uc_load_valid and skip_uc_load are set above */
 
-	mem = &ipa->mem[IPA_MEM_MODEM_PROC_CTX];
+	mem = ipa_mem_find(ipa, IPA_MEM_MODEM_PROC_CTX);
 	if (mem->size) {
 		req.hdr_proc_ctx_tbl_info_valid = 1;
 		req.hdr_proc_ctx_tbl_info.start =
@@ -347,7 +347,7 @@ init_modem_driver_req(struct ipa_qmi *ipa_qmi)
 
 	/* Nothing to report for the compression table (zip_tbl_info) */
 
-	mem = &ipa->mem[IPA_MEM_V4_ROUTE_HASHED];
+	mem = ipa_mem_find(ipa, IPA_MEM_V4_ROUTE_HASHED);
 	if (mem->size) {
 		req.v4_hash_route_tbl_info_valid = 1;
 		req.v4_hash_route_tbl_info.start =
@@ -355,7 +355,7 @@ init_modem_driver_req(struct ipa_qmi *ipa_qmi)
 		req.v4_hash_route_tbl_info.count = mem->size / sizeof(__le64);
 	}
 
-	mem = &ipa->mem[IPA_MEM_V6_ROUTE_HASHED];
+	mem = ipa_mem_find(ipa, IPA_MEM_V6_ROUTE_HASHED);
 	if (mem->size) {
 		req.v6_hash_route_tbl_info_valid = 1;
 		req.v6_hash_route_tbl_info.start =
@@ -363,22 +363,21 @@ init_modem_driver_req(struct ipa_qmi *ipa_qmi)
 		req.v6_hash_route_tbl_info.count = mem->size / sizeof(__le64);
 	}
 
-	mem = &ipa->mem[IPA_MEM_V4_FILTER_HASHED];
+	mem = ipa_mem_find(ipa, IPA_MEM_V4_FILTER_HASHED);
 	if (mem->size) {
 		req.v4_hash_filter_tbl_start_valid = 1;
 		req.v4_hash_filter_tbl_start = ipa->mem_offset + mem->offset;
 	}
 
-	mem = &ipa->mem[IPA_MEM_V6_FILTER_HASHED];
+	mem = ipa_mem_find(ipa, IPA_MEM_V6_FILTER_HASHED);
 	if (mem->size) {
 		req.v6_hash_filter_tbl_start_valid = 1;
 		req.v6_hash_filter_tbl_start = ipa->mem_offset + mem->offset;
 	}
 
-	/* None of the stats fields are valid (IPA v4.0 and above) */
-
+	/* The stats fields are only valid for IPA v4.0+ */
 	if (ipa->version >= IPA_VERSION_4_0) {
-		mem = &ipa->mem[IPA_MEM_STATS_QUOTA_MODEM];
+		mem = ipa_mem_find(ipa, IPA_MEM_STATS_QUOTA_MODEM);
 		if (mem->size) {
 			req.hw_stats_quota_base_addr_valid = 1;
 			req.hw_stats_quota_base_addr =
@@ -387,8 +386,9 @@ init_modem_driver_req(struct ipa_qmi *ipa_qmi)
 			req.hw_stats_quota_size = ipa->mem_offset + mem->size;
 		}
 
-		mem = &ipa->mem[IPA_MEM_STATS_DROP];
-		if (mem->size) {
+		/* If the DROP stats region is defined, include it */
+		mem = ipa_mem_find(ipa, IPA_MEM_STATS_DROP);
+		if (mem && mem->size) {
 			req.hw_stats_drop_base_addr_valid = 1;
 			req.hw_stats_drop_base_addr =
 				ipa->mem_offset + mem->offset;
diff --git a/drivers/net/ipa/ipa_table.c b/drivers/net/ipa/ipa_table.c
index 679855b1d5495..c617a9156f26d 100644
--- a/drivers/net/ipa/ipa_table.c
+++ b/drivers/net/ipa/ipa_table.c
@@ -152,7 +152,7 @@ static void ipa_table_validate_build(void)
 static bool
 ipa_table_valid_one(struct ipa *ipa, enum ipa_mem_id mem_id, bool route)
 {
-	const struct ipa_mem *mem = &ipa->mem[mem_id];
+	const struct ipa_mem *mem = ipa_mem_find(ipa, mem_id);
 	struct device *dev = &ipa->pdev->dev;
 	u32 size;
 
@@ -245,7 +245,7 @@ static void ipa_table_reset_add(struct gsi_trans *trans, bool filter,
 				u16 first, u16 count, enum ipa_mem_id mem_id)
 {
 	struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
-	const struct ipa_mem *mem = &ipa->mem[mem_id];
+	const struct ipa_mem *mem = ipa_mem_find(ipa, mem_id);
 	dma_addr_t addr;
 	u32 offset;
 	u16 size;
@@ -417,8 +417,8 @@ static void ipa_table_init_add(struct gsi_trans *trans, bool filter,
 			       enum ipa_mem_id hash_mem_id)
 {
 	struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
-	const struct ipa_mem *hash_mem = &ipa->mem[hash_mem_id];
-	const struct ipa_mem *mem = &ipa->mem[mem_id];
+	const struct ipa_mem *hash_mem = ipa_mem_find(ipa, hash_mem_id);
+	const struct ipa_mem *mem = ipa_mem_find(ipa, mem_id);
 	dma_addr_t hash_addr;
 	dma_addr_t addr;
 	u16 hash_count;
diff --git a/drivers/net/ipa/ipa_uc.c b/drivers/net/ipa/ipa_uc.c
index 2756363e69385..fd9219863234c 100644
--- a/drivers/net/ipa/ipa_uc.c
+++ b/drivers/net/ipa/ipa_uc.c
@@ -116,7 +116,8 @@ enum ipa_uc_event {
 
 static struct ipa_uc_mem_area *ipa_uc_shared(struct ipa *ipa)
 {
-	u32 offset = ipa->mem_offset + ipa->mem[IPA_MEM_UC_SHARED].offset;
+	const struct ipa_mem *mem = ipa_mem_find(ipa, IPA_MEM_UC_SHARED);
+	u32 offset = ipa->mem_offset + mem->offset;
 
 	return ipa->mem_virt + offset;
 }
-- 
2.27.0

[PATCH net-next 8/8] net: ipa: don't index mem data array by ID

[Alex Elder]

Finally the code handles the IPA memory region array in the
configuration data without assuming it is indexed by region ID.
Get rid of the array index designators where these arrays are
initialized.  As a result, there's no more need to define an
explicitly undefined memory region ID, so get rid of that.

Change ipa_mem_find() so it no longer assumes the ipa->mem[] array
is indexed by memory region ID.  Instead, have it search the array
for the entry having the requested memory ID, and return the address
of the descriptor if found.  Otherwise return NULL.

Stop allowing memory regions to be defined with zero size and zero
canary value.  Check for this condition in ipa_mem_valid_one().
As a result, it is not necessary to check for this case in
ipa_mem_config().

Finally, there is no need for IPA_MEM_UNDEFINED to be defined any
more, so get rid of it.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_data-v3.5.1.c | 30 ++++++++++----------
 drivers/net/ipa/ipa_data-v4.11.c  | 44 ++++++++++++++---------------
 drivers/net/ipa/ipa_data-v4.2.c   | 36 ++++++++++++------------
 drivers/net/ipa/ipa_data-v4.5.c   | 46 +++++++++++++++----------------
 drivers/net/ipa/ipa_data-v4.9.c   | 46 +++++++++++++++----------------
 drivers/net/ipa/ipa_mem.c         | 38 +++++++++++--------------
 drivers/net/ipa/ipa_mem.h         |  1 -
 7 files changed, 117 insertions(+), 124 deletions(-)

diff --git a/drivers/net/ipa/ipa_data-v3.5.1.c b/drivers/net/ipa/ipa_data-v3.5.1.c
index 945d45b72b247..af536ef8c1209 100644
--- a/drivers/net/ipa/ipa_data-v3.5.1.c
+++ b/drivers/net/ipa/ipa_data-v3.5.1.c
@@ -271,91 +271,91 @@ static const struct ipa_resource_data ipa_resource_data = {
 
 /* 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] = {
+	{
 		.id		= IPA_MEM_UC_SHARED,
 		.offset		= 0x0000,
 		.size		= 0x0080,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_UC_INFO] = {
+	{
 		.id		= IPA_MEM_UC_INFO,
 		.offset		= 0x0080,
 		.size		= 0x0200,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_V4_FILTER_HASHED] = {
+	{
 		.id		= IPA_MEM_V4_FILTER_HASHED,
 		.offset		= 0x0288,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V4_FILTER] = {
+	{
 		.id		= IPA_MEM_V4_FILTER,
 		.offset		= 0x0308,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_FILTER_HASHED] = {
+	{
 		.id		= IPA_MEM_V6_FILTER_HASHED,
 		.offset		= 0x0388,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_FILTER] = {
+	{
 		.id		= IPA_MEM_V6_FILTER,
 		.offset		= 0x0408,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V4_ROUTE_HASHED] = {
+	{
 		.id		= IPA_MEM_V4_ROUTE_HASHED,
 		.offset		= 0x0488,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V4_ROUTE] = {
+	{
 		.id		= IPA_MEM_V4_ROUTE,
 		.offset		= 0x0508,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_ROUTE_HASHED] = {
+	{
 		.id		= IPA_MEM_V6_ROUTE_HASHED,
 		.offset		= 0x0588,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_ROUTE] = {
+	{
 		.id		= IPA_MEM_V6_ROUTE,
 		.offset		= 0x0608,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_MODEM_HEADER] = {
+	{
 		.id		= IPA_MEM_MODEM_HEADER,
 		.offset		= 0x0688,
 		.size		= 0x0140,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_MODEM_PROC_CTX] = {
+	{
 		.id		= IPA_MEM_MODEM_PROC_CTX,
 		.offset		= 0x07d0,
 		.size		= 0x0200,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_AP_PROC_CTX] = {
+	{
 		.id		= IPA_MEM_AP_PROC_CTX,
 		.offset		= 0x09d0,
 		.size		= 0x0200,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_MODEM] = {
+	{
 		.id		= IPA_MEM_MODEM,
 		.offset		= 0x0bd8,
 		.size		= 0x1024,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_UC_EVENT_RING] = {
+	{
 		.id		= IPA_MEM_UC_EVENT_RING,
 		.offset		= 0x1c00,
 		.size		= 0x0400,
diff --git a/drivers/net/ipa/ipa_data-v4.11.c b/drivers/net/ipa/ipa_data-v4.11.c
index 2ff3fcf4e21fa..9353efbd504fb 100644
--- a/drivers/net/ipa/ipa_data-v4.11.c
+++ b/drivers/net/ipa/ipa_data-v4.11.c
@@ -220,133 +220,133 @@ static const struct ipa_resource_data ipa_resource_data = {
 
 /* IPA-resident memory region data for an SoC having IPA v4.11 */
 static const struct ipa_mem ipa_mem_local_data[] = {
-	[IPA_MEM_UC_SHARED] = {
+	{
 		.id		= IPA_MEM_UC_SHARED,
 		.offset		= 0x0000,
 		.size		= 0x0080,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_UC_INFO] = {
+	{
 		.id		= IPA_MEM_UC_INFO,
 		.offset		= 0x0080,
 		.size		= 0x0200,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_V4_FILTER_HASHED] = {
+	{
 		.id		= IPA_MEM_V4_FILTER_HASHED,
 		.offset		= 0x0288,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V4_FILTER] = {
+	{
 		.id		= IPA_MEM_V4_FILTER,
 		.offset		= 0x0308,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_FILTER_HASHED] = {
+	{
 		.id		= IPA_MEM_V6_FILTER_HASHED,
 		.offset		= 0x0388,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_FILTER] = {
+	{
 		.id		= IPA_MEM_V6_FILTER,
 		.offset		= 0x0408,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V4_ROUTE_HASHED] = {
+	{
 		.id		= IPA_MEM_V4_ROUTE_HASHED,
 		.offset		= 0x0488,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V4_ROUTE] = {
+	{
 		.id		= IPA_MEM_V4_ROUTE,
 		.offset		= 0x0508,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_ROUTE_HASHED] = {
+	{
 		.id		= IPA_MEM_V6_ROUTE_HASHED,
 		.offset		= 0x0588,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_ROUTE] = {
+	{
 		.id		= IPA_MEM_V6_ROUTE,
 		.offset		= 0x0608,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_MODEM_HEADER] = {
+	{
 		.id		= IPA_MEM_MODEM_HEADER,
 		.offset		= 0x0688,
 		.size		= 0x0240,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_AP_HEADER] = {
+	{
 		.id		= IPA_MEM_AP_HEADER,
 		.offset		= 0x08c8,
 		.size		= 0x0200,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_MODEM_PROC_CTX] = {
+	{
 		.id		= IPA_MEM_MODEM_PROC_CTX,
 		.offset		= 0x0ad0,
 		.size		= 0x0200,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_AP_PROC_CTX] = {
+	{
 		.id		= IPA_MEM_AP_PROC_CTX,
 		.offset		= 0x0cd0,
 		.size		= 0x0200,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_NAT_TABLE] = {
+	{
 		.id		= IPA_MEM_NAT_TABLE,
 		.offset		= 0x0ee0,
 		.size		= 0x0d00,
 		.canary_count	= 4,
 	},
-	[IPA_MEM_PDN_CONFIG] = {
+	{
 		.id		= IPA_MEM_PDN_CONFIG,
 		.offset		= 0x1be8,
 		.size		= 0x0050,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_STATS_QUOTA_MODEM] = {
+	{
 		.id		= IPA_MEM_STATS_QUOTA_MODEM,
 		.offset		= 0x1c40,
 		.size		= 0x0030,
 		.canary_count	= 4,
 	},
-	[IPA_MEM_STATS_QUOTA_AP] = {
+	{
 		.id		= IPA_MEM_STATS_QUOTA_AP,
 		.offset		= 0x1c70,
 		.size		= 0x0048,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_STATS_TETHERING] = {
+	{
 		.id		= IPA_MEM_STATS_TETHERING,
 		.offset		= 0x1cb8,
 		.size		= 0x0238,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_STATS_DROP] = {
+	{
 		.id		= IPA_MEM_STATS_DROP,
 		.offset		= 0x1ef0,
 		.size		= 0x0020,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_MODEM] = {
+	{
 		.id		= IPA_MEM_MODEM,
 		.offset		= 0x1f18,
 		.size		= 0x100c,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_END_MARKER] = {
+	{
 		.id		= IPA_MEM_END_MARKER,
 		.offset		= 0x3000,
 		.size		= 0x0000,
diff --git a/drivers/net/ipa/ipa_data-v4.2.c b/drivers/net/ipa/ipa_data-v4.2.c
index f06eb07a7895d..3b09b7baa95f4 100644
--- a/drivers/net/ipa/ipa_data-v4.2.c
+++ b/drivers/net/ipa/ipa_data-v4.2.c
@@ -219,109 +219,109 @@ static const struct ipa_resource_data ipa_resource_data = {
 
 /* 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] = {
+	{
 		.id		= IPA_MEM_UC_SHARED,
 		.offset		= 0x0000,
 		.size		= 0x0080,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_UC_INFO] = {
+	{
 		.id		= IPA_MEM_UC_INFO,
 		.offset		= 0x0080,
 		.size		= 0x0200,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_V4_FILTER_HASHED] = {
+	{
 		.id		= IPA_MEM_V4_FILTER_HASHED,
 		.offset		= 0x0288,
 		.size		= 0,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V4_FILTER] = {
+	{
 		.id		= IPA_MEM_V4_FILTER,
 		.offset		= 0x0290,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_FILTER_HASHED] = {
+	{
 		.id		= IPA_MEM_V6_FILTER_HASHED,
 		.offset		= 0x0310,
 		.size		= 0,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_FILTER] = {
+	{
 		.id		= IPA_MEM_V6_FILTER,
 		.offset		= 0x0318,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V4_ROUTE_HASHED] = {
+	{
 		.id		= IPA_MEM_V4_ROUTE_HASHED,
 		.offset		= 0x0398,
 		.size		= 0,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V4_ROUTE] = {
+	{
 		.id		= IPA_MEM_V4_ROUTE,
 		.offset		= 0x03a0,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_ROUTE_HASHED] = {
+	{
 		.id		= IPA_MEM_V6_ROUTE_HASHED,
 		.offset		= 0x0420,
 		.size		= 0,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_ROUTE] = {
+	{
 		.id		= IPA_MEM_V6_ROUTE,
 		.offset		= 0x0428,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_MODEM_HEADER] = {
+	{
 		.id		= IPA_MEM_MODEM_HEADER,
 		.offset		= 0x04a8,
 		.size		= 0x0140,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_MODEM_PROC_CTX] = {
+	{
 		.id		= IPA_MEM_MODEM_PROC_CTX,
 		.offset		= 0x05f0,
 		.size		= 0x0200,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_AP_PROC_CTX] = {
+	{
 		.id		= IPA_MEM_AP_PROC_CTX,
 		.offset		= 0x07f0,
 		.size		= 0x0200,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_PDN_CONFIG] = {
+	{
 		.id		= IPA_MEM_PDN_CONFIG,
 		.offset		= 0x09f8,
 		.size		= 0x0050,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_STATS_QUOTA_MODEM] = {
+	{
 		.id		= IPA_MEM_STATS_QUOTA_MODEM,
 		.offset		= 0x0a50,
 		.size		= 0x0060,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_STATS_TETHERING] = {
+	{
 		.id		= IPA_MEM_STATS_TETHERING,
 		.offset		= 0x0ab0,
 		.size		= 0x0140,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_MODEM] = {
+	{
 		.id		= IPA_MEM_MODEM,
 		.offset		= 0x0bf0,
 		.size		= 0x140c,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_END_MARKER] = {
+	{
 		.id		= IPA_MEM_END_MARKER,
 		.offset		= 0x2000,
 		.size		= 0,
diff --git a/drivers/net/ipa/ipa_data-v4.5.c b/drivers/net/ipa/ipa_data-v4.5.c
index 1c8a9099639ab..a99b6478fa3a5 100644
--- a/drivers/net/ipa/ipa_data-v4.5.c
+++ b/drivers/net/ipa/ipa_data-v4.5.c
@@ -265,139 +265,139 @@ static const struct ipa_resource_data ipa_resource_data = {
 
 /* IPA-resident memory region data for an SoC having IPA v4.5 */
 static const struct ipa_mem ipa_mem_local_data[] = {
-	[IPA_MEM_UC_SHARED] = {
+	{
 		.id		= IPA_MEM_UC_SHARED,
 		.offset		= 0x0000,
 		.size		= 0x0080,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_UC_INFO] = {
+	{
 		.id		= IPA_MEM_UC_INFO,
 		.offset		= 0x0080,
 		.size		= 0x0200,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_V4_FILTER_HASHED] = {
+	{
 		.id		= IPA_MEM_V4_FILTER_HASHED,
 		.offset		= 0x0288,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V4_FILTER] = {
+	{
 		.id		= IPA_MEM_V4_FILTER,
 		.offset		= 0x0308,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_FILTER_HASHED] = {
+	{
 		.id		= IPA_MEM_V6_FILTER_HASHED,
 		.offset		= 0x0388,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_FILTER] = {
+	{
 		.id		= IPA_MEM_V6_FILTER,
 		.offset		= 0x0408,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V4_ROUTE_HASHED] = {
+	{
 		.id		= IPA_MEM_V4_ROUTE_HASHED,
 		.offset		= 0x0488,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V4_ROUTE] = {
+	{
 		.id		= IPA_MEM_V4_ROUTE,
 		.offset		= 0x0508,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_ROUTE_HASHED] = {
+	{
 		.id		= IPA_MEM_V6_ROUTE_HASHED,
 		.offset		= 0x0588,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_ROUTE] = {
+	{
 		.id		= IPA_MEM_V6_ROUTE,
 		.offset		= 0x0608,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_MODEM_HEADER] = {
+	{
 		.id		= IPA_MEM_MODEM_HEADER,
 		.offset		= 0x0688,
 		.size		= 0x0240,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_AP_HEADER] = {
+	{
 		.id		= IPA_MEM_AP_HEADER,
 		.offset		= 0x08c8,
 		.size		= 0x0200,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_MODEM_PROC_CTX] = {
+	{
 		.id		= IPA_MEM_MODEM_PROC_CTX,
 		.offset		= 0x0ad0,
 		.size		= 0x0b20,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_AP_PROC_CTX] = {
+	{
 		.id		= IPA_MEM_AP_PROC_CTX,
 		.offset		= 0x15f0,
 		.size		= 0x0200,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_NAT_TABLE] = {
+	{
 		.id		= IPA_MEM_NAT_TABLE,
 		.offset		= 0x1800,
 		.size		= 0x0d00,
 		.canary_count	= 4,
 	},
-	[IPA_MEM_STATS_QUOTA_MODEM] = {
+	{
 		.id		= IPA_MEM_STATS_QUOTA_MODEM,
 		.offset		= 0x2510,
 		.size		= 0x0030,
 		.canary_count	= 4,
 	},
-	[IPA_MEM_STATS_QUOTA_AP] = {
+	{
 		.id		= IPA_MEM_STATS_QUOTA_AP,
 		.offset		= 0x2540,
 		.size		= 0x0048,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_STATS_TETHERING] = {
+	{
 		.id		= IPA_MEM_STATS_TETHERING,
 		.offset		= 0x2588,
 		.size		= 0x0238,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_STATS_FILTER_ROUTE] = {
+	{
 		.id		= IPA_MEM_STATS_FILTER_ROUTE,
 		.offset		= 0x27c0,
 		.size		= 0x0800,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_STATS_DROP] = {
+	{
 		.id		= IPA_MEM_STATS_DROP,
 		.offset		= 0x2fc0,
 		.size		= 0x0020,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_MODEM] = {
+	{
 		.id		= IPA_MEM_MODEM,
 		.offset		= 0x2fe8,
 		.size		= 0x0800,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_UC_EVENT_RING] = {
+	{
 		.id		= IPA_MEM_UC_EVENT_RING,
 		.offset		= 0x3800,
 		.size		= 0x1000,
 		.canary_count	= 1,
 	},
-	[IPA_MEM_PDN_CONFIG] = {
+	{
 		.id		= IPA_MEM_PDN_CONFIG,
 		.offset		= 0x4800,
 		.size		= 0x0050,
diff --git a/drivers/net/ipa/ipa_data-v4.9.c b/drivers/net/ipa/ipa_data-v4.9.c
index f77169709eb2a..798d43e1eb133 100644
--- a/drivers/net/ipa/ipa_data-v4.9.c
+++ b/drivers/net/ipa/ipa_data-v4.9.c
@@ -263,139 +263,139 @@ static const struct ipa_resource_data ipa_resource_data = {
 
 /* IPA-resident memory region data for an SoC having IPA v4.9 */
 static const struct ipa_mem ipa_mem_local_data[] = {
-	[IPA_MEM_UC_SHARED] = {
+	{
 		.id		= IPA_MEM_UC_SHARED,
 		.offset		= 0x0000,
 		.size		= 0x0080,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_UC_INFO] = {
+	{
 		.id		= IPA_MEM_UC_INFO,
 		.offset		= 0x0080,
 		.size		= 0x0200,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_V4_FILTER_HASHED] = {
+	{
 		.id		= IPA_MEM_V4_FILTER_HASHED,
 		.offset		= 0x0288,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V4_FILTER] = {
+	{
 		.id		= IPA_MEM_V4_FILTER,
 		.offset		= 0x0308,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_FILTER_HASHED] = {
+	{
 		.id		= IPA_MEM_V6_FILTER_HASHED,
 		.offset		= 0x0388,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_FILTER] = {
+	{
 		.id		= IPA_MEM_V6_FILTER,
 		.offset		= 0x0408,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V4_ROUTE_HASHED] = {
+	{
 		.id		= IPA_MEM_V4_ROUTE_HASHED,
 		.offset		= 0x0488,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V4_ROUTE] = {
+	{
 		.id		= IPA_MEM_V4_ROUTE,
 		.offset		= 0x0508,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_ROUTE_HASHED] = {
+	{
 		.id		= IPA_MEM_V6_ROUTE_HASHED,
 		.offset		= 0x0588,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_V6_ROUTE] = {
+	{
 		.id		= IPA_MEM_V6_ROUTE,
 		.offset		= 0x0608,
 		.size		= 0x0078,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_MODEM_HEADER] = {
+	{
 		.id		= IPA_MEM_MODEM_HEADER,
 		.offset		= 0x0688,
 		.size		= 0x0240,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_AP_HEADER] = {
+	{
 		.id		= IPA_MEM_AP_HEADER,
 		.offset		= 0x08c8,
 		.size		= 0x0200,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_MODEM_PROC_CTX] = {
+	{
 		.id		= IPA_MEM_MODEM_PROC_CTX,
 		.offset		= 0x0ad0,
 		.size		= 0x0b20,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_AP_PROC_CTX] = {
+	{
 		.id		= IPA_MEM_AP_PROC_CTX,
 		.offset		= 0x15f0,
 		.size		= 0x0200,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_NAT_TABLE] = {
+	{
 		.id		= IPA_MEM_NAT_TABLE,
 		.offset		= 0x1800,
 		.size		= 0x0d00,
 		.canary_count	= 4,
 	},
-	[IPA_MEM_STATS_QUOTA_MODEM] = {
+	{
 		.id		= IPA_MEM_STATS_QUOTA_MODEM,
 		.offset		= 0x2510,
 		.size		= 0x0030,
 		.canary_count	= 4,
 	},
-	[IPA_MEM_STATS_QUOTA_AP] = {
+	{
 		.id		= IPA_MEM_STATS_QUOTA_AP,
 		.offset		= 0x2540,
 		.size		= 0x0048,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_STATS_TETHERING] = {
+	{
 		.id		= IPA_MEM_STATS_TETHERING,
 		.offset		= 0x2588,
 		.size		= 0x0238,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_STATS_FILTER_ROUTE] = {
+	{
 		.id		= IPA_MEM_STATS_FILTER_ROUTE,
 		.offset		= 0x27c0,
 		.size		= 0x0800,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_STATS_DROP] = {
+	{
 		.id		= IPA_MEM_STATS_DROP,
 		.offset		= 0x2fc0,
 		.size		= 0x0020,
 		.canary_count	= 0,
 	},
-	[IPA_MEM_MODEM] = {
+	{
 		.id		= IPA_MEM_MODEM,
 		.offset		= 0x2fe8,
 		.size		= 0x0800,
 		.canary_count	= 2,
 	},
-	[IPA_MEM_UC_EVENT_RING] = {
+	{
 		.id		= IPA_MEM_UC_EVENT_RING,
 		.offset		= 0x3800,
 		.size		= 0x1000,
 		.canary_count	= 1,
 	},
-	[IPA_MEM_PDN_CONFIG] = {
+	{
 		.id		= IPA_MEM_PDN_CONFIG,
 		.offset		= 0x4800,
 		.size		= 0x0050,
diff --git a/drivers/net/ipa/ipa_mem.c b/drivers/net/ipa/ipa_mem.c
index 633895fc67b66..4337b0920d3d7 100644
--- a/drivers/net/ipa/ipa_mem.c
+++ b/drivers/net/ipa/ipa_mem.c
@@ -28,8 +28,14 @@
 
 const struct ipa_mem *ipa_mem_find(struct ipa *ipa, enum ipa_mem_id mem_id)
 {
-	if (mem_id < IPA_MEM_COUNT)
-		return &ipa->mem[mem_id];
+	u32 i;
+
+	for (i = 0; i < ipa->mem_count; i++) {
+		const struct ipa_mem *mem = &ipa->mem[i];
+
+		if (mem->id == mem_id)
+			return mem;
+	}
 
 	return NULL;
 }
@@ -209,6 +215,11 @@ static bool ipa_mem_valid_one(struct ipa *ipa, const struct ipa_mem *mem)
 		return false;
 	}
 
+	if (!mem->size && !mem->canary_count) {
+		dev_err(dev, "empty memory region %u\n", mem_id);
+		return false;
+	}
+
 	/* Other than modem memory, sizes must be a multiple of 8 */
 	size_multiple = mem_id == IPA_MEM_MODEM ? 4 : 8;
 	if (mem->size % size_multiple)
@@ -244,25 +255,14 @@ static bool ipa_mem_valid(struct ipa *ipa, const struct ipa_mem_data *mem_data)
 	for (i = 0; i < mem_data->local_count; i++) {
 		const struct ipa_mem *mem = &mem_data->local[i];
 
-		if (mem->id == IPA_MEM_UNDEFINED)
-			continue;
-
 		if (__test_and_set_bit(mem->id, regions)) {
 			dev_err(dev, "duplicate memory region %u\n", mem->id);
 			return false;
 		}
 
 		/* Defined regions have non-zero size and/or canary count */
-		if (mem->size || mem->canary_count) {
-			if (ipa_mem_valid_one(ipa, mem))
-				continue;
+		if (!ipa_mem_valid_one(ipa, mem))
 			return false;
-		}
-
-		/* It's harmless, but warn if an offset is provided */
-		if (mem->offset)
-			dev_warn(dev, "empty region %u has non-zero offset\n",
-				 mem->id);
 	}
 
 	/* Now see if any required regions are not defined */
@@ -349,20 +349,14 @@ int ipa_mem_config(struct ipa *ipa)
 	 * space prior to the region's base address if indicated.
 	 */
 	for (i = 0; i < ipa->mem_count; i++) {
-		u16 canary_count;
+		u16 canary_count = ipa->mem[i].canary_count;
 		__le32 *canary;
 
-		/* Skip over undefined regions */
-		mem = &ipa->mem[i];
-		if (!mem->offset && !mem->size)
-			continue;
-
-		canary_count = mem->canary_count;
 		if (!canary_count)
 			continue;
 
 		/* Write canary values in the space before the region */
-		canary = ipa->mem_virt + ipa->mem_offset + mem->offset;
+		canary = ipa->mem_virt + ipa->mem_offset + ipa->mem[i].offset;
 		do
 			*--canary = IPA_MEM_CANARY_VAL;
 		while (--canary_count);
diff --git a/drivers/net/ipa/ipa_mem.h b/drivers/net/ipa/ipa_mem.h
index 712b2881be0c2..570bfdd99bffb 100644
--- a/drivers/net/ipa/ipa_mem.h
+++ b/drivers/net/ipa/ipa_mem.h
@@ -43,7 +43,6 @@ struct ipa_mem_data;
 
 /* IPA-resident memory region ids */
 enum ipa_mem_id {
-	IPA_MEM_UNDEFINED = 0,		/* undefined region */
 	IPA_MEM_UC_SHARED,		/* 0 canaries */
 	IPA_MEM_UC_INFO,		/* 0 canaries */
 	IPA_MEM_V4_FILTER_HASHED,	/* 2 canaries */
-- 
2.27.0