From: Shahaf Shuler <shahafs@mellanox.com>
Date: Thu, 18 May 2017 10:44:45 +0000 (+0300)
Subject: net/mlx5: fix completion buffer size
X-Git-Tag: spdx-start~3145
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=626e8bfb84d55a7234d9b79c35bd7005f076fd0d;p=dpdk.git

net/mlx5: fix completion buffer size

Completion buffer size was computed wrongly, causing
completion polling to wraparound too early and miss entries.

Fixing it by using Direct Verbs to query the CQ info.

Fixes: 6218063b39a6 ("net/mlx5: refactor Rx data path")
Fixes: 1d88ba171942 ("net/mlx5: refactor Tx data path")
Cc: stable@dpdk.org

Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
Acked-by: Yongseok Koh <yskoh@mellanox.com>
Acked-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
---

diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c
index 8b7823360c..2a2683985a 100644
--- a/drivers/net/mlx5/mlx5_rxq.c
+++ b/drivers/net/mlx5/mlx5_rxq.c
@@ -838,12 +838,16 @@ static inline int
 rxq_setup(struct rxq_ctrl *tmpl)
 {
 	struct ibv_cq *ibcq = tmpl->cq;
-	struct mlx5_cq *cq = to_mxxx(cq, cq);
+	struct ibv_mlx5_cq_info cq_info;
 	struct mlx5_rwq *rwq = container_of(tmpl->wq, struct mlx5_rwq, wq);
 	struct rte_mbuf *(*elts)[1 << tmpl->rxq.elts_n] =
 		rte_calloc_socket("RXQ", 1, sizeof(*elts), 0, tmpl->socket);
 
-	if (cq->cqe_sz != RTE_CACHE_LINE_SIZE) {
+	if (ibv_mlx5_exp_get_cq_info(ibcq, &cq_info)) {
+		ERROR("Unable to query CQ info. check your OFED.");
+		return ENOTSUP;
+	}
+	if (cq_info.cqe_size != RTE_CACHE_LINE_SIZE) {
 		ERROR("Wrong MLX5_CQE_SIZE environment variable value: "
 		      "it should be set to %u", RTE_CACHE_LINE_SIZE);
 		return EINVAL;
@@ -851,16 +855,16 @@ rxq_setup(struct rxq_ctrl *tmpl)
 	if (elts == NULL)
 		return ENOMEM;
 	tmpl->rxq.rq_db = rwq->rq.db;
-	tmpl->rxq.cqe_n = log2above(ibcq->cqe);
+	tmpl->rxq.cqe_n = log2above(cq_info.cqe_cnt);
 	tmpl->rxq.cq_ci = 0;
 	tmpl->rxq.rq_ci = 0;
-	tmpl->rxq.cq_db = cq->dbrec;
+	tmpl->rxq.cq_db = cq_info.dbrec;
 	tmpl->rxq.wqes =
 		(volatile struct mlx5_wqe_data_seg (*)[])
 		(uintptr_t)rwq->rq.buff;
 	tmpl->rxq.cqes =
 		(volatile struct mlx5_cqe (*)[])
-		(uintptr_t)cq->active_buf->buf;
+		(uintptr_t)cq_info.buf;
 	tmpl->rxq.elts = elts;
 	return 0;
 }
diff --git a/drivers/net/mlx5/mlx5_txq.c b/drivers/net/mlx5/mlx5_txq.c
index de7e28be60..6c1387e568 100644
--- a/drivers/net/mlx5/mlx5_txq.c
+++ b/drivers/net/mlx5/mlx5_txq.c
@@ -173,23 +173,27 @@ txq_setup(struct txq_ctrl *tmpl, struct txq_ctrl *txq_ctrl)
 {
 	struct mlx5_qp *qp = to_mqp(tmpl->qp);
 	struct ibv_cq *ibcq = tmpl->cq;
-	struct mlx5_cq *cq = to_mxxx(cq, cq);
+	struct ibv_mlx5_cq_info cq_info;
 
-	if (cq->cqe_sz != RTE_CACHE_LINE_SIZE) {
+	if (ibv_mlx5_exp_get_cq_info(ibcq, &cq_info)) {
+		ERROR("Unable to query CQ info. check your OFED.");
+		return ENOTSUP;
+	}
+	if (cq_info.cqe_size != RTE_CACHE_LINE_SIZE) {
 		ERROR("Wrong MLX5_CQE_SIZE environment variable value: "
 		      "it should be set to %u", RTE_CACHE_LINE_SIZE);
 		return EINVAL;
 	}
-	tmpl->txq.cqe_n = log2above(ibcq->cqe);
+	tmpl->txq.cqe_n = log2above(cq_info.cqe_cnt);
 	tmpl->txq.qp_num_8s = qp->ctrl_seg.qp_num << 8;
 	tmpl->txq.wqes = qp->gen_data.sqstart;
 	tmpl->txq.wqe_n = log2above(qp->sq.wqe_cnt);
 	tmpl->txq.qp_db = &qp->gen_data.db[MLX5_SND_DBR];
 	tmpl->txq.bf_reg = qp->gen_data.bf->reg;
-	tmpl->txq.cq_db = cq->dbrec;
+	tmpl->txq.cq_db = cq_info.dbrec;
 	tmpl->txq.cqes =
 		(volatile struct mlx5_cqe (*)[])
-		(uintptr_t)cq->active_buf->buf;
+		(uintptr_t)cq_info.buf;
 	tmpl->txq.elts =
 		(struct rte_mbuf *(*)[1 << tmpl->txq.elts_n])
 		((uintptr_t)txq_ctrl + sizeof(*txq_ctrl));