[dpdk-stable] patch 'net/enic: fix packet loss after MTU change' has been queued to stable release 17.08.1

[Yuanhan Liu]

Hi,

FYI, your patch has been queued to stable release 17.08.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/24/17. So please
shout if anyone has objections.

Thanks.

	--yliu

---
>From 41a054797a3c2cd727ae4e3b2770ad042ce9004d Mon Sep 17 00:00:00 2001
From: John Daley <johndale at cisco.com>
Date: Mon, 23 Oct 2017 13:23:00 -0700
Subject: [PATCH] net/enic: fix packet loss after MTU change

[ upstream commit ea5f15b1c49a687eaa57d435a8bf68e553b50b30 ]

If multiple Rx queues and Rx Scatter are used and the MTU is
modified so that the number of mbufs per packet changes, packet
loss is possible.

The enic completion queue index was miscalculated leaving the
upper half of the queues uninitialized after an MTU change, possibly
leading to completions on those queues not getting processed.

Fixes: c3e09182bcd6 ("net/enic: support scatter Rx in MTU update")

Signed-off-by: John Daley <johndale at cisco.com>
---
 drivers/net/enic/enic_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index cac8b66..cc71bf2 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -1117,11 +1117,12 @@ static int
 enic_reinit_rq(struct enic *enic, unsigned int rq_idx)
 {
 	struct vnic_rq *sop_rq, *data_rq;
-	unsigned int cq_idx = enic_cq_rq(enic, rq_idx);
+	unsigned int cq_idx;
 	int rc = 0;
 
 	sop_rq = &enic->rq[enic_rte_rq_idx_to_sop_idx(rq_idx)];
 	data_rq = &enic->rq[enic_rte_rq_idx_to_data_idx(rq_idx)];
+	cq_idx = rq_idx;
 
 	vnic_cq_clean(&enic->cq[cq_idx]);
 	vnic_cq_init(&enic->cq[cq_idx],
-- 
2.7.4