[dpdk-dev] [PATCH v1 9/9] net/mlx5: recover secondary process Tx errors

[Matan Azrad]

The SQ errors recovery mechanism in the PMD invokes a Verbs
functions to modify the RQ states in order to reset the SQ and to
reactivate it.

These Verbs functions are not allowed to be invoked from a secondary
process, hence the PMD skips the recovery when the error is captured
by secondary processes queues.

Using the DPDK IPC mechanism the secondary process can request Verbs
queues state modifications to be done synchronically by the primary
process.

Add support for secondary process Tx errors recovery.

Cc: stable at dpdk.org

Signed-off-by: Matan Azrad <matan at mellanox.com>
---
 drivers/net/mlx5/mlx5_rxtx.c | 104 ++++++++++++++++++++++++++-----------------
 1 file changed, 62 insertions(+), 42 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index cb3baad..9659478 100644
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -51,6 +51,10 @@
 static __rte_always_inline void
 mprq_buf_replace(struct mlx5_rxq_data *rxq, uint16_t rq_idx);
 
+static int
+mlx5_queue_state_modify(struct rte_eth_dev *dev,
+			struct mlx5_mp_arg_queue_state_modify *sm);
+
 uint32_t mlx5_ptype_table[] __rte_cache_aligned = {
 	[0xff] = RTE_PTYPE_ALL_MASK, /* Last entry for errored packet. */
 };
@@ -570,52 +574,27 @@
 }
 
 /**
- * Move QP from error state to running state.
+ * Move QP from error state to running state and initialize indexes.
  *
- * @param txq
- *   Pointer to TX queue structure.
- * @param qp
- *   The qp pointer for recovery.
+ * @param txq_ctrl
+ *   Pointer to TX queue control structure.
  *
  * @return
- *   0 on success, else errno value.
+ *   0 on success, else -1.
  */
 static int
-tx_recover_qp(struct mlx5_txq_data *txq, struct ibv_qp *qp)
+tx_recover_qp(struct mlx5_txq_ctrl *txq_ctrl)
 {
-	int ret;
-	struct ibv_qp_attr mod = {
-					.qp_state = IBV_QPS_RESET,
-					.port_num = 1,
-				};
-	ret = mlx5_glue->modify_qp(qp, &mod, IBV_QP_STATE);
-	if (ret) {
-		DRV_LOG(ERR, "Cannot change the Tx QP state to RESET %d\n",
-			ret);
-		return ret;
-	}
-	mod.qp_state = IBV_QPS_INIT;
-	ret = mlx5_glue->modify_qp(qp, &mod,
-				   (IBV_QP_STATE | IBV_QP_PORT));
-	if (ret) {
-		DRV_LOG(ERR, "Cannot change Tx QP state to INIT %d\n", ret);
-		return ret;
-	}
-	mod.qp_state = IBV_QPS_RTR;
-	ret = mlx5_glue->modify_qp(qp, &mod, IBV_QP_STATE);
-	if (ret) {
-		DRV_LOG(ERR, "Cannot change Tx QP state to RTR %d\n", ret);
-		return ret;
-	}
-	mod.qp_state = IBV_QPS_RTS;
-	ret = mlx5_glue->modify_qp(qp, &mod, IBV_QP_STATE);
-	if (ret) {
-		DRV_LOG(ERR, "Cannot change Tx QP state to RTS %d\n", ret);
-		return ret;
-	}
-	txq->wqe_ci = 0;
-	txq->wqe_pi = 0;
-	txq->elts_comp = 0;
+	struct mlx5_mp_arg_queue_state_modify sm = {
+			.is_wq = 0,
+			.queue_id = txq_ctrl->txq.idx,
+	};
+
+	if (mlx5_queue_state_modify(ETH_DEV(txq_ctrl->priv), &sm))
+		return -1;
+	txq_ctrl->txq.wqe_ci = 0;
+	txq_ctrl->txq.wqe_pi = 0;
+	txq_ctrl->txq.elts_comp = 0;
 	return 0;
 }
 
@@ -690,8 +669,7 @@
 			 */
 			txq->stats.oerrors += ((txq->wqe_ci & wqe_m) -
 						new_wqe_pi) & wqe_m;
-		if ((rte_eal_process_type() == RTE_PROC_PRIMARY) &&
-		    tx_recover_qp(txq, txq_ctrl->ibv->qp) == 0) {
+		if (tx_recover_qp(txq_ctrl) == 0) {
 			txq->cq_ci++;
 			/* Release all the remaining buffers. */
 			return txq->elts_head;
@@ -2065,6 +2043,48 @@
 			rte_errno = errno;
 			return ret;
 		}
+	} else {
+		struct mlx5_txq_data *txq = (*priv->txqs)[sm->queue_id];
+		struct mlx5_txq_ctrl *txq_ctrl =
+			container_of(txq, struct mlx5_txq_ctrl, txq);
+		struct ibv_qp_attr mod = {
+			.qp_state = IBV_QPS_RESET,
+			.port_num = (uint8_t)priv->ibv_port,
+		};
+		struct ibv_qp *qp = txq_ctrl->ibv->qp;
+
+		ret = mlx5_glue->modify_qp(qp, &mod, IBV_QP_STATE);
+		if (ret) {
+			DRV_LOG(ERR, "Cannot change the Tx QP state to RESET "
+				"%s\n", strerror(errno));
+			rte_errno = errno;
+			return ret;
+		}
+		mod.qp_state = IBV_QPS_INIT;
+		ret = mlx5_glue->modify_qp(qp, &mod,
+					   (IBV_QP_STATE | IBV_QP_PORT));
+		if (ret) {
+			DRV_LOG(ERR, "Cannot change Tx QP state to INIT %s\n",
+				strerror(errno));
+			rte_errno = errno;
+			return ret;
+		}
+		mod.qp_state = IBV_QPS_RTR;
+		ret = mlx5_glue->modify_qp(qp, &mod, IBV_QP_STATE);
+		if (ret) {
+			DRV_LOG(ERR, "Cannot change Tx QP state to RTR %s\n",
+				strerror(errno));
+			rte_errno = errno;
+			return ret;
+		}
+		mod.qp_state = IBV_QPS_RTS;
+		ret = mlx5_glue->modify_qp(qp, &mod, IBV_QP_STATE);
+		if (ret) {
+			DRV_LOG(ERR, "Cannot change Tx QP state to RTS %s\n",
+				strerror(errno));
+			rte_errno = errno;
+			return ret;
+		}
 	}
 	return 0;
 }
-- 
1.8.3.1