[dpdk-stable] patch 'net/netvsc: remove process event optimization' has been queued to stable release 19.11.3

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 19.11.3

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 05/21/20. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Thanks.

Luca Boccassi

---
>From 62ec946eec4fefabcb4bf2314f78579edf29fe8c Mon Sep 17 00:00:00 2001
From: Stephen Hemminger <stephen at networkplumber.org>
Date: Tue, 31 Mar 2020 10:14:01 -0700
Subject: [PATCH] net/netvsc: remove process event optimization

[ upstream commit dfd3f0fce8bd64182b984b4a9226f2d23c44b2d5 ]

Remove unlocked check for data in receive ring.
This check is not safe because of missing barriers etc.

Fixes: 4e9c73e96e83 ("net/netvsc: add Hyper-V network device")

Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
---
 drivers/net/netvsc/hn_rxtx.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/net/netvsc/hn_rxtx.c b/drivers/net/netvsc/hn_rxtx.c
index 32c03e3da0..e8df846042 100644
--- a/drivers/net/netvsc/hn_rxtx.c
+++ b/drivers/net/netvsc/hn_rxtx.c
@@ -969,10 +969,6 @@ uint32_t hn_process_events(struct hn_data *hv, uint16_t queue_id,
 
 	rxq = queue_id == 0 ? hv->primary : dev->data->rx_queues[queue_id];
 
-	/* If no pending data then nothing to do */
-	if (rte_vmbus_chan_rx_empty(rxq->chan))
-		return 0;
-
 	/*
 	 * Since channel is shared between Rx and TX queue need to have a lock
 	 * since DPDK does not force same CPU to be used for Rx/Tx.
-- 
2.20.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2020-05-19 14:04:46.415451914 +0100
+++ 0046-net-netvsc-remove-process-event-optimization.patch	2020-05-19 14:04:44.184647792 +0100
@@ -1,13 +1,14 @@
-From dfd3f0fce8bd64182b984b4a9226f2d23c44b2d5 Mon Sep 17 00:00:00 2001
+From 62ec946eec4fefabcb4bf2314f78579edf29fe8c Mon Sep 17 00:00:00 2001
 From: Stephen Hemminger <stephen at networkplumber.org>
 Date: Tue, 31 Mar 2020 10:14:01 -0700
 Subject: [PATCH] net/netvsc: remove process event optimization
 
+[ upstream commit dfd3f0fce8bd64182b984b4a9226f2d23c44b2d5 ]
+
 Remove unlocked check for data in receive ring.
 This check is not safe because of missing barriers etc.
 
 Fixes: 4e9c73e96e83 ("net/netvsc: add Hyper-V network device")
-Cc: stable at dpdk.org
 
 Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
 ---