netdev - [net-next 06/17] net/mlx5: DR, Warn and ignore SW steering rule insertion on QP err

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Date:   Thu, 26 Aug 2021 17:57:51 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Yevgeny Kliteynik <kliteyn@...dia.com>,
        Yuval Avnery <yuvalav@...lanox.com>,
        Alex Vesker <valex@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: [net-next 06/17] net/mlx5: DR, Warn and ignore SW steering rule insertion on QP err

From: Yevgeny Kliteynik <kliteyn@...dia.com>

In the event of SW steering QP entering error state, SW steering
cannot insert more rules, and will silently ignore the insertion
after issuing a warning.

Signed-off-by: Yuval Avnery <yuvalav@...lanox.com>
Signed-off-by: Yevgeny Kliteynik <kliteyn@...dia.com>
Reviewed-by: Alex Vesker <valex@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 .../mellanox/mlx5/core/steering/dr_send.c        | 16 ++++++++++++++--
 .../mellanox/mlx5/core/steering/dr_types.h       |  1 +
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_send.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_send.c
index 24f40e17f176..bfb14b4b1906 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_send.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_send.c
@@ -325,10 +325,14 @@ static int dr_handle_pending_wc(struct mlx5dr_domain *dmn,
 
 	do {
 		ne = dr_poll_cq(send_ring->cq, 1);
-		if (ne < 0)
+		if (unlikely(ne < 0)) {
+			mlx5_core_warn_once(dmn->mdev, "SMFS QPN 0x%x is disabled/limited",
+					    send_ring->qp->qpn);
+			send_ring->err_state = true;
 			return ne;
-		else if (ne == 1)
+		} else if (ne == 1) {
 			send_ring->pending_wqe -= send_ring->signal_th;
+		}
 	} while (is_drain && send_ring->pending_wqe);
 
 	return 0;
@@ -361,6 +365,14 @@ static int dr_postsend_icm_data(struct mlx5dr_domain *dmn,
 	u32 buff_offset;
 	int ret;
 
+	if (unlikely(dmn->mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR ||
+		     send_ring->err_state)) {
+		mlx5_core_dbg_once(dmn->mdev,
+				   "Skipping post send: QP err state: %d, device state: %d\n",
+				   send_ring->err_state, dmn->mdev->state);
+		return 0;
+	}
+
 	spin_lock(&send_ring->lock);
 
 	ret = dr_handle_pending_wc(dmn, send_ring);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_types.h b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_types.h
index 474cf32a67c4..4fd14e9b7e1c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_types.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_types.h
@@ -1285,6 +1285,7 @@ struct mlx5dr_send_ring {
 	u8 sync_buff[MIN_READ_SYNC];
 	struct mlx5dr_mr *sync_mr;
 	spinlock_t lock; /* Protect the data path of the send ring */
+	bool err_state; /* send_ring is not usable in err state */
 };
 
 int mlx5dr_send_ring_alloc(struct mlx5dr_domain *dmn);
-- 
2.31.1