netdev - [PATCH net-next 03/15] bnxt_en: Improve TQM ring context memory sizing formulas.

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Date:   Mon,  4 May 2020 04:50:29 -0400
From:   Michael Chan <michael.chan@...adcom.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org
Subject: [PATCH net-next 03/15] bnxt_en: Improve TQM ring context memory sizing formulas.

The current formulas to calculate the TQM slow path and fast path ring
context memory sizes are not quite correct.  TQM slow path entry is
array index 0 of ctx->tqm_mem[].  The other array entries are for fast
path.  Fix these sizes according to latest firmware spec. for 57500 and
newer chips.

Fixes: 3be8136ce14e ("bnxt_en: Initialize context memory to the value specified by firmware.")
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 32a2083..0cf41a1 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -6760,6 +6760,7 @@ static int bnxt_alloc_ctx_mem(struct bnxt *bp)
 	struct bnxt_ctx_pg_info *ctx_pg;
 	struct bnxt_ctx_mem_info *ctx;
 	u32 mem_size, ena, entries;
+	u32 entries_sp, min;
 	u32 num_mr, num_ah;
 	u32 extra_srqs = 0;
 	u32 extra_qps = 0;
@@ -6849,14 +6850,17 @@ static int bnxt_alloc_ctx_mem(struct bnxt *bp)
 	ena |= FUNC_BACKING_STORE_CFG_REQ_ENABLES_TIM;
 
 skip_rdma:
-	entries = ctx->qp_max_l2_entries + extra_qps;
+	min = ctx->tqm_min_entries_per_ring;
+	entries_sp = ctx->vnic_max_vnic_entries + ctx->qp_max_l2_entries +
+		     2 * (extra_qps + ctx->qp_min_qp1_entries) + min;
+	entries_sp = roundup(entries_sp, ctx->tqm_entries_multiple);
+	entries = ctx->qp_max_l2_entries + extra_qps + ctx->qp_min_qp1_entries;
 	entries = roundup(entries, ctx->tqm_entries_multiple);
-	entries = clamp_t(u32, entries, ctx->tqm_min_entries_per_ring,
-			  ctx->tqm_max_entries_per_ring);
+	entries = clamp_t(u32, entries, min, ctx->tqm_max_entries_per_ring);
 	for (i = 0; i < ctx->tqm_fp_rings_count + 1; i++) {
 		ctx_pg = ctx->tqm_mem[i];
-		ctx_pg->entries = entries;
-		mem_size = ctx->tqm_entry_size * entries;
+		ctx_pg->entries = i ? entries : entries_sp;
+		mem_size = ctx->tqm_entry_size * ctx_pg->entries;
 		rc = bnxt_alloc_ctx_pg_tbls(bp, ctx_pg, mem_size, 1, false);
 		if (rc)
 			return rc;
-- 
2.5.1