[dpdk-dev] [PATCH 5/6] net/bnxt: modify context memory allocation code

[Ajit Khaparde <ajitkhaparde@gmail.com>]

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

Newer devices like SR2 may have chip backing store and do not require
host backed memory allocation.

In these cases, HWRM_FUNC_BACKING_STORE_QCAPS will return a zero entry
size to indicate contexts for which the host should not allocate backing
store.

Selectively allocate context memory based on device capabilities and
only enable backing store for the appropriate contexts.

Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
---
 drivers/net/bnxt/bnxt_ethdev.c | 60 ++++++++++++++++++++--------------
 drivers/net/bnxt/bnxt_hwrm.c   |  3 ++
 2 files changed, 39 insertions(+), 24 deletions(-)

diff --git a/drivers/net/bnxt/bnxt_ethdev.c b/drivers/net/bnxt/bnxt_ethdev.c
index 8ca4fb151..e11751cc1 100644
--- a/drivers/net/bnxt/bnxt_ethdev.c
+++ b/drivers/net/bnxt/bnxt_ethdev.c
@@ -4212,39 +4212,49 @@ int bnxt_alloc_ctx_mem(struct bnxt *bp)
 
 	ctx_pg = &ctx->qp_mem;
 	ctx_pg->entries = ctx->qp_min_qp1_entries + ctx->qp_max_l2_entries;
-	mem_size = ctx->qp_entry_size * ctx_pg->entries;
-	rc = bnxt_alloc_ctx_mem_blk(bp, ctx_pg, mem_size, "qp_mem", 0);
-	if (rc)
-		return rc;
+	if (ctx->qp_entry_size) {
+		mem_size = ctx->qp_entry_size * ctx_pg->entries;
+		rc = bnxt_alloc_ctx_mem_blk(bp, ctx_pg, mem_size, "qp_mem", 0);
+		if (rc)
+			return rc;
+	}
 
 	ctx_pg = &ctx->srq_mem;
 	ctx_pg->entries = ctx->srq_max_l2_entries;
-	mem_size = ctx->srq_entry_size * ctx_pg->entries;
-	rc = bnxt_alloc_ctx_mem_blk(bp, ctx_pg, mem_size, "srq_mem", 0);
-	if (rc)
-		return rc;
+	if (ctx->srq_entry_size) {
+		mem_size = ctx->srq_entry_size * ctx_pg->entries;
+		rc = bnxt_alloc_ctx_mem_blk(bp, ctx_pg, mem_size, "srq_mem", 0);
+		if (rc)
+			return rc;
+	}
 
 	ctx_pg = &ctx->cq_mem;
 	ctx_pg->entries = ctx->cq_max_l2_entries;
-	mem_size = ctx->cq_entry_size * ctx_pg->entries;
-	rc = bnxt_alloc_ctx_mem_blk(bp, ctx_pg, mem_size, "cq_mem", 0);
-	if (rc)
-		return rc;
+	if (ctx->cq_entry_size) {
+		mem_size = ctx->cq_entry_size * ctx_pg->entries;
+		rc = bnxt_alloc_ctx_mem_blk(bp, ctx_pg, mem_size, "cq_mem", 0);
+		if (rc)
+			return rc;
+	}
 
 	ctx_pg = &ctx->vnic_mem;
 	ctx_pg->entries = ctx->vnic_max_vnic_entries +
 		ctx->vnic_max_ring_table_entries;
-	mem_size = ctx->vnic_entry_size * ctx_pg->entries;
-	rc = bnxt_alloc_ctx_mem_blk(bp, ctx_pg, mem_size, "vnic_mem", 0);
-	if (rc)
-		return rc;
+	if (ctx->vnic_entry_size) {
+		mem_size = ctx->vnic_entry_size * ctx_pg->entries;
+		rc = bnxt_alloc_ctx_mem_blk(bp, ctx_pg, mem_size, "vnic_mem", 0);
+		if (rc)
+			return rc;
+	}
 
 	ctx_pg = &ctx->stat_mem;
 	ctx_pg->entries = ctx->stat_max_entries;
-	mem_size = ctx->stat_entry_size * ctx_pg->entries;
-	rc = bnxt_alloc_ctx_mem_blk(bp, ctx_pg, mem_size, "stat_mem", 0);
-	if (rc)
-		return rc;
+	if (ctx->stat_entry_size) {
+		mem_size = ctx->stat_entry_size * ctx_pg->entries;
+		rc = bnxt_alloc_ctx_mem_blk(bp, ctx_pg, mem_size, "stat_mem", 0);
+		if (rc)
+			return rc;
+	}
 
 	min = ctx->tqm_min_entries_per_ring;
 
@@ -4260,10 +4270,12 @@ int bnxt_alloc_ctx_mem(struct bnxt *bp)
 	for (i = 0, ena = 0; i < ctx->tqm_fp_rings_count + 1; i++) {
 		ctx_pg = ctx->tqm_mem[i];
 		ctx_pg->entries = i ? entries : entries_sp;
-		mem_size = ctx->tqm_entry_size * ctx_pg->entries;
-		rc = bnxt_alloc_ctx_mem_blk(bp, ctx_pg, mem_size, "tqm_mem", i);
-		if (rc)
-			return rc;
+		if (ctx->tqm_entry_size) {
+			mem_size = ctx->tqm_entry_size * ctx_pg->entries;
+			rc = bnxt_alloc_ctx_mem_blk(bp, ctx_pg, mem_size, "tqm_mem", i);
+			if (rc)
+				return rc;
+		}
 		ena |= HWRM_FUNC_BACKING_STORE_CFG_INPUT_ENABLES_TQM_SP << i;
 	}
 
diff --git a/drivers/net/bnxt/bnxt_hwrm.c b/drivers/net/bnxt/bnxt_hwrm.c
index 56e2e33a9..6d54b1656 100644
--- a/drivers/net/bnxt/bnxt_hwrm.c
+++ b/drivers/net/bnxt/bnxt_hwrm.c
@@ -64,6 +64,9 @@ static void bnxt_hwrm_set_pg_attr(struct bnxt_ring_mem_info *rmem,
 				  uint8_t *pg_attr,
 				  uint64_t *pg_dir)
 {
+	if (rmem->nr_pages == 0)
+		return;
+
 	if (rmem->nr_pages > 1) {
 		*pg_attr = 1;
 		*pg_dir = rte_cpu_to_le_64(rmem->pg_tbl_map);
-- 
2.21.1 (Apple Git-122.3)