[PATCH 19.11 5/8] net/bnxt: fix memzone allocation per VNIC

[Kalesh A P]

From: Kalesh AP <kalesh-anakkur.purayil at broadcom.com>

[ upstream commit 5b8b248c9679b9571f73a75e1905d7cef39e6c6e ]

In case of Thor RSS table size is too big. This could result in
memory allocation failure when the supported vnic count is high.
Instead of allocating the memzone for all VNICs in one shot,
allocate for each VNIC individually.

Also, fixed to free the memzone in the uninit path.

Fixes: 9738793f28ec ("net/bnxt: add VNIC functions and structs")

Signed-off-by: Kalesh AP <kalesh-anakkur.purayil at broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde at broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur at broadcom.com>
---
 drivers/net/bnxt/bnxt_vnic.c | 67 +++++++++++++++++++-------------------------
 drivers/net/bnxt/bnxt_vnic.h |  1 +
 2 files changed, 30 insertions(+), 38 deletions(-)

diff --git a/drivers/net/bnxt/bnxt_vnic.c b/drivers/net/bnxt/bnxt_vnic.c
index 9bcf385..d64c413 100644
--- a/drivers/net/bnxt/bnxt_vnic.c
+++ b/drivers/net/bnxt/bnxt_vnic.c
@@ -98,18 +98,11 @@ void bnxt_free_vnic_attributes(struct bnxt *bp)
 
 	for (i = 0; i < bp->max_vnics; i++) {
 		vnic = &bp->vnic_info[i];
-		if (vnic->rss_table) {
-			/* 'Unreserve' the rss_table */
-			/* N/A */
-
-			vnic->rss_table = NULL;
-		}
-
-		if (vnic->rss_hash_key) {
-			/* 'Unreserve' the rss_hash_key */
-			/* N/A */
-
+		if (vnic->rss_mz != NULL) {
+			rte_memzone_free(vnic->rss_mz);
+			vnic->rss_mz = NULL;
 			vnic->rss_hash_key = NULL;
+			vnic->rss_table = NULL;
 		}
 	}
 }
@@ -122,7 +115,6 @@ int bnxt_alloc_vnic_attributes(struct bnxt *bp, bool reconfig)
 	char mz_name[RTE_MEMZONE_NAMESIZE];
 	uint32_t entry_length;
 	size_t rss_table_size;
-	uint16_t max_vnics;
 	int i;
 	rte_iova_t mz_phys_addr;
 
@@ -136,38 +128,37 @@ int bnxt_alloc_vnic_attributes(struct bnxt *bp, bool reconfig)
 
 	entry_length = RTE_CACHE_LINE_ROUNDUP(entry_length + rss_table_size);
 
-	max_vnics = bp->max_vnics;
-	snprintf(mz_name, RTE_MEMZONE_NAMESIZE,
-		 "bnxt_%04x:%02x:%02x:%02x_vnicattr", pdev->addr.domain,
-		 pdev->addr.bus, pdev->addr.devid, pdev->addr.function);
-	mz_name[RTE_MEMZONE_NAMESIZE - 1] = 0;
-	mz = rte_memzone_lookup(mz_name);
-	if (!mz) {
-		mz = rte_memzone_reserve(mz_name,
-				entry_length * max_vnics,
-				bp->eth_dev->device->numa_node,
-				RTE_MEMZONE_2MB |
-				RTE_MEMZONE_SIZE_HINT_ONLY |
-				RTE_MEMZONE_IOVA_CONTIG);
-		if (!mz)
-			return -ENOMEM;
-	}
-	mz_phys_addr = mz->iova;
-
-	for (i = 0; i < max_vnics; i++) {
+	for (i = 0; i < bp->max_vnics; i++) {
 		vnic = &bp->vnic_info[i];
 
+		snprintf(mz_name, RTE_MEMZONE_NAMESIZE,
+			 "bnxt_%04x:%02x:%02x:%02x_vnicattr_%d", pdev->addr.domain,
+			 pdev->addr.bus, pdev->addr.devid, pdev->addr.function, i);
+		mz_name[RTE_MEMZONE_NAMESIZE - 1] = 0;
+		mz = rte_memzone_lookup(mz_name);
+		if (mz == NULL) {
+			mz = rte_memzone_reserve(mz_name,
+						 entry_length,
+						 bp->eth_dev->device->numa_node,
+						 RTE_MEMZONE_2MB |
+						 RTE_MEMZONE_SIZE_HINT_ONLY |
+						 RTE_MEMZONE_IOVA_CONTIG);
+			if (mz == NULL) {
+				PMD_DRV_LOG(ERR, "Cannot allocate bnxt vnic_attributes memory\n");
+				return -ENOMEM;
+			}
+		}
+		vnic->rss_mz = mz;
+		mz_phys_addr = mz->iova;
+
 		/* Allocate rss table and hash key */
-		vnic->rss_table =
-			(void *)((char *)mz->addr + (entry_length * i));
+		vnic->rss_table = (void *)((char *)mz->addr);
+		vnic->rss_table_dma_addr = mz_phys_addr;
 		memset(vnic->rss_table, -1, entry_length);
 
-		vnic->rss_table_dma_addr = mz_phys_addr + (entry_length * i);
-		vnic->rss_hash_key = (void *)((char *)vnic->rss_table +
-					      rss_table_size);
+		vnic->rss_hash_key = (void *)((char *)vnic->rss_table + rss_table_size);
+		vnic->rss_hash_key_dma_addr = vnic->rss_table_dma_addr + rss_table_size;
 
-		vnic->rss_hash_key_dma_addr = vnic->rss_table_dma_addr +
-					      rss_table_size;
 		if (!reconfig) {
 			bnxt_prandom_bytes(vnic->rss_hash_key, HW_HASH_KEY_SIZE);
 			memcpy(bp->rss_conf.rss_key, vnic->rss_hash_key, HW_HASH_KEY_SIZE);
diff --git a/drivers/net/bnxt/bnxt_vnic.h b/drivers/net/bnxt/bnxt_vnic.h
index a9818b1..6fb5ec2 100644
--- a/drivers/net/bnxt/bnxt_vnic.h
+++ b/drivers/net/bnxt/bnxt_vnic.h
@@ -25,6 +25,7 @@ struct bnxt_vnic_info {
 	uint16_t	mru;
 	uint16_t	hash_type;
 	uint8_t		hash_mode;
+	const struct rte_memzone *rss_mz;
 	rte_iova_t	rss_table_dma_addr;
 	uint16_t	*rss_table;
 	rte_iova_t	rss_hash_key_dma_addr;
-- 
2.10.1