[dpdk-stable] patch 'net/enic: fix packet loss after MTU change' has been queued to LTS release 16.11.4

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to LTS release 16.11.4

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/04/17. So please
shout if anyone has objections.

Thanks.

Kind regards,
Luca Boccassi

---
>From 02d632155451162a76705a8123a668c727c954c6 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 86c5539f3..b25eff4f1 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -1125,11 +1125,12 @@ 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],
-- 
2.11.0