linux-kernel - [PATCH net-next 7/7] net: ipa: check table memory regions earlier

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Date:   Fri, 21 Oct 2022 14:13:40 -0500
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     mka@...omium.org, evgreen@...omium.org, andersson@...nel.org,
        quic_cpratapa@...cinc.com, quic_avuyyuru@...cinc.com,
        quic_jponduru@...cinc.com, quic_subashab@...cinc.com,
        elder@...nel.org, netdev@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 7/7] net: ipa: check table memory regions earlier

Verify that the sizes of the routing and filter table memory regions
are valid as part of memory initialization, rather than waiting for
table initialization.  The main reason to do this is that upcoming
patches use these memory region sizes to determine the number of
entries in these tables, and we'll want to know these sizes are good
sooner.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_mem.c   | 6 ++++++
 drivers/net/ipa/ipa_table.c | 7 +------
 drivers/net/ipa/ipa_table.h | 7 +++++++
 3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ipa/ipa_mem.c b/drivers/net/ipa/ipa_mem.c
index 4022ae01a1319..a3d2317452ac6 100644
--- a/drivers/net/ipa/ipa_mem.c
+++ b/drivers/net/ipa/ipa_mem.c
@@ -617,6 +617,12 @@ int ipa_mem_init(struct ipa *ipa, const struct ipa_mem_data *mem_data)
 	ipa->mem_count = mem_data->local_count;
 	ipa->mem = mem_data->local;
 
+	/* Check the route and filter table memory regions */
+	if (!ipa_table_mem_valid(ipa, 0))
+		return -EINVAL;
+	if (!ipa_table_mem_valid(ipa, IPA_ROUTE_MODEM_COUNT))
+		return -EINVAL;
+
 	ret = dma_set_mask_and_coherent(&ipa->pdev->dev, DMA_BIT_MASK(64));
 	if (ret) {
 		dev_err(dev, "error %d setting DMA mask\n", ret);
diff --git a/drivers/net/ipa/ipa_table.c b/drivers/net/ipa/ipa_table.c
index 7a60f2867de92..58a1a9da3133e 100644
--- a/drivers/net/ipa/ipa_table.c
+++ b/drivers/net/ipa/ipa_table.c
@@ -567,7 +567,7 @@ void ipa_table_config(struct ipa *ipa)
 }
 
 /* Zero modem_route_count means filter table memory check */
-static bool ipa_table_mem_valid(struct ipa *ipa, bool modem_route_count)
+bool ipa_table_mem_valid(struct ipa *ipa, bool modem_route_count)
 {
 	bool hash_support = ipa_table_hash_support(ipa);
 	bool filter = !modem_route_count;
@@ -688,11 +688,6 @@ int ipa_table_init(struct ipa *ipa)
 
 	ipa_table_validate_build();
 
-	if (!ipa_table_mem_valid(ipa, 0))
-		return -EINVAL;
-	if (!ipa_table_mem_valid(ipa, IPA_ROUTE_MODEM_COUNT))
-		return -EINVAL;
-
 	/* 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
diff --git a/drivers/net/ipa/ipa_table.h b/drivers/net/ipa/ipa_table.h
index 73ca8369c6352..65d96debd3917 100644
--- a/drivers/net/ipa/ipa_table.h
+++ b/drivers/net/ipa/ipa_table.h
@@ -78,4 +78,11 @@ int ipa_table_init(struct ipa *ipa);
  */
 void ipa_table_exit(struct ipa *ipa);
 
+/**
+ * ipa_table_mem_valid() - Validate sizes of table memory regions
+ * @ipa:	IPA pointer
+ * @modem_route_count:	Number of modem route table entries
+ */
+bool ipa_table_mem_valid(struct ipa *ipa, bool modem_route_count);
+
 #endif /* _IPA_TABLE_H_ */
-- 
2.34.1