patches for DPDK stable branches
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From: Xueming Li <xuemingl@nvidia.com>
To: <dev@dpdk.org>, Maxime Coquelin <maxime.coquelin@redhat.com>
Cc: <xuemingl@nvidia.com>, <stable@dpdk.org>
Subject: [PATCH v3 2/7] vdpa/mlx5: fix dead loop when process interrupted
Date: Sun, 8 May 2022 17:25:49 +0300
Message-ID: <20220508142554.560354-3-xuemingl@nvidia.com> (raw)
In-Reply-To: <20220508142554.560354-1-xuemingl@nvidia.com>

In Ctrl+C handling, sometimes kick handling thread gets endless EGAIN
error and fall into dead lock.

Kick happens frequently in real system due to busy traffic or retry
mechanism. This patch simplifies kick firmware anyway and skip setting
hardware notifier due to potential device error, notifier could be set
in next successful kick request.

Fixes: 62c813706e41 ("vdpa/mlx5: map doorbell")
Cc: stable@dpdk.org

Signed-off-by: Xueming Li <xuemingl@nvidia.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 drivers/vdpa/mlx5/mlx5_vdpa_virtq.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c b/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c
index 2e517beda24..2696d54b412 100644
--- a/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c
+++ b/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c
@@ -23,11 +23,11 @@ mlx5_vdpa_virtq_kick_handler(void *cb_arg)
 	struct mlx5_vdpa_priv *priv = virtq->priv;
 	uint64_t buf;
 	int nbytes;
+	int retry;
 
 	if (rte_intr_fd_get(virtq->intr_handle) < 0)
 		return;
-
-	do {
+	for (retry = 0; retry < 3; ++retry) {
 		nbytes = read(rte_intr_fd_get(virtq->intr_handle), &buf,
 			      8);
 		if (nbytes < 0) {
@@ -39,7 +39,9 @@ mlx5_vdpa_virtq_kick_handler(void *cb_arg)
 				virtq->index, strerror(errno));
 		}
 		break;
-	} while (1);
+	}
+	if (nbytes < 0)
+		return;
 	rte_write32(virtq->index, priv->virtq_db_addr);
 	if (virtq->notifier_state == MLX5_VDPA_NOTIFIER_STATE_DISABLED) {
 		if (rte_vhost_host_notifier_ctrl(priv->vid, virtq->index, true))
-- 
2.35.1


      parent reply	other threads:[~2022-05-08 14:26 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20220224132820.1939650-1-xuemingl@nvidia.com>
2022-02-24 13:28 ` [PATCH 1/7] vdpa/mlx5: fix interrupt trash that leads to segment fault Xueming Li
2022-02-24 13:28 ` [PATCH 2/7] vdpa/mlx5: fix dead loop when process interrupted Xueming Li
     [not found] ` <20220224143809.1977642-1-xuemingl@nvidia.com>
2022-02-24 14:38   ` [PATCH v1 1/7] vdpa/mlx5: fix interrupt trash that leads to segment fault Xueming Li
2022-02-24 14:38   ` [PATCH v1 2/7] vdpa/mlx5: fix dead loop when process interrupted Xueming Li
     [not found] ` <20220224155101.1991626-1-xuemingl@nvidia.com>
2022-02-24 15:50   ` [PATCH v2 1/7] vdpa/mlx5: fix interrupt trash that leads to segment fault Xueming Li
2022-04-20 10:39     ` Maxime Coquelin
2022-02-24 15:50   ` [PATCH v2 2/7] vdpa/mlx5: fix dead loop when process interrupted Xueming Li
2022-04-20 10:33     ` Maxime Coquelin
     [not found] ` <20220508142554.560354-1-xuemingl@nvidia.com>
2022-05-08 14:25   ` [PATCH v3 1/7] vdpa/mlx5: fix interrupt trash that leads to segment fault Xueming Li
2022-05-08 14:25   ` Xueming Li [this message]

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