net/mlx5e: Report and recover from rx timeout

Add support for report and recovery from rx timeout. On driver open we
post NOP work request on the rx channels to trigger napi in order to
fillup the rx rings. In case napi wasn't scheduled due to a lost
interrupt, perform EQ recovery.
Signed-off-by: Aya Levin <ayal@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/en/health.h

@@ -19,6 +19,7 @@ int mlx5e_reporter_named_obj_nest_end(struct devlink_fmsg *fmsg);
 int mlx5e_reporter_rx_create(struct mlx5e_priv *priv);
 void mlx5e_reporter_rx_destroy(struct mlx5e_priv *priv);
 void mlx5e_reporter_icosq_cqe_err(struct mlx5e_icosq *icosq);
+void mlx5e_reporter_rx_timeout(struct mlx5e_rq *rq);
 
 #define MLX5E_REPORTER_PER_Q_MAX_LEN 256
 

drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c

@@ -115,6 +115,38 @@ void mlx5e_reporter_icosq_cqe_err(struct mlx5e_icosq *icosq)
 	mlx5e_health_report(priv, priv->rx_reporter, err_str, &err_ctx);
 }
 
+static int mlx5e_rx_reporter_timeout_recover(void *ctx)
+{
+	struct mlx5e_icosq *icosq;
+	struct mlx5_eq_comp *eq;
+	struct mlx5e_rq *rq;
+	int err;
+
+	rq = ctx;
+	icosq = &rq->channel->icosq;
+	eq = rq->cq.mcq.eq;
+	err = mlx5e_health_channel_eq_recover(eq, rq->channel);
+	if (err)
+		clear_bit(MLX5E_SQ_STATE_ENABLED, &icosq->state);
+
+	return err;
+}
+
+void mlx5e_reporter_rx_timeout(struct mlx5e_rq *rq)
+{
+	struct mlx5e_icosq *icosq = &rq->channel->icosq;
+	struct mlx5e_priv *priv = rq->channel->priv;
+	char err_str[MLX5E_REPORTER_PER_Q_MAX_LEN];
+	struct mlx5e_err_ctx err_ctx = {};
+
+	err_ctx.ctx = rq;
+	err_ctx.recover = mlx5e_rx_reporter_timeout_recover;
+	sprintf(err_str, "RX timeout on channel: %d, ICOSQ: 0x%x RQ: 0x%x, CQ: 0x%x\n",
+		icosq->channel->ix, icosq->sqn, rq->rqn, rq->cq.mcq.cqn);
+
+	mlx5e_health_report(priv, priv->rx_reporter, err_str, &err_ctx);
+}
+
 static int mlx5e_rx_reporter_recover_from_ctx(struct mlx5e_err_ctx *err_ctx)
 {
 	return err_ctx->recover(err_ctx->ctx);

drivers/net/ethernet/mellanox/mlx5/core/en_main.c

@@ -808,6 +808,7 @@ int mlx5e_wait_for_min_rx_wqes(struct mlx5e_rq *rq, int wait_time)
 	netdev_warn(c->netdev, "Failed to get min RX wqes on Channel[%d] RQN[0x%x] wq cur_sz(%d) min_rx_wqes(%d)\n",
 		    c->ix, rq->rqn, mlx5e_rqwq_get_cur_sz(rq), min_wqes);
 
+	mlx5e_reporter_rx_timeout(rq);
 	return -ETIMEDOUT;
 }