[dpdk-stable] patch 'net/mlx4: fix flow creation before start' has been queued to stable release 17.05.2

[Yuanhan Liu]

Hi,

FYI, your patch has been queued to stable release 17.05.2

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 08/24/17. So please
shout if anyone has objections.

Thanks.

	--yliu

---
>From 3f666ca92676cfca2e2ee87d9874e3ad4a15fdf7 Mon Sep 17 00:00:00 2001
From: Matan Azrad <matan at mellanox.com>
Date: Thu, 27 Jul 2017 13:27:24 +0300
Subject: [PATCH] net/mlx4: fix flow creation before start

[ upstream commit f3b10f1d2474dfa6774ec31e1a8dc14c76b3ac53 ]

The corrupted code causes segmentation fault when user creates
flow with drop action before device starting.

For example, failsafe PMD recreates all the flows before calling
dev_start in plug-in sequence and mlx4 allocated its flow drop
queue in dev_start.
Hence, when failsafe created flow with drop action after plug-in
event, mlx4 tried to dereference flow drop queue which was
uninitialized.

The fix added check to the drop qp accessible and conditioned the
ibv_create_flow calling on device starting.

Fixes: 642fe56a1ba5 ("net/mlx4: use a single drop queue for all drop flows")
Fixes: 46d5736a7049 ("net/mlx4: support basic flow items and actions")

Signed-off-by: Matan Azrad <matan at mellanox.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil at 6wind.com>
---
 drivers/net/mlx4/mlx4_flow.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mlx4/mlx4_flow.c b/drivers/net/mlx4/mlx4_flow.c
index edfac03..b9a024b 100644
--- a/drivers/net/mlx4/mlx4_flow.c
+++ b/drivers/net/mlx4/mlx4_flow.c
@@ -829,7 +829,7 @@ priv_flow_create_action_queue(struct priv *priv,
 		return NULL;
 	}
 	if (action->drop) {
-		qp = priv->flow_drop_queue->qp;
+		qp = priv->flow_drop_queue ? priv->flow_drop_queue->qp : NULL;
 	} else {
 		struct rxq *rxq = (*priv->rxqs)[action->queue_id];
 
@@ -837,6 +837,8 @@ priv_flow_create_action_queue(struct priv *priv,
 		rte_flow->qp = qp;
 	}
 	rte_flow->ibv_attr = ibv_attr;
+	if (!priv->started)
+		return rte_flow;
 	rte_flow->ibv_flow = ibv_create_flow(qp, rte_flow->ibv_attr);
 	if (!rte_flow->ibv_flow) {
 		rte_flow_error_set(error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE,
-- 
2.7.4