From 0598625d2e17374b7d5693972f5acb59fef25f63 Mon Sep 17 00:00:00 2001
From: Stephen Hemminger <sthemmin@microsoft.com>
Date: Wed, 5 Dec 2018 14:11:58 -0800
Subject: [PATCH 3/3] net/netvsc: disable multi-queue on older servers

[ upstream commit afbc22bf51ab98b9b61b11eb6d38278a9d577111 ]

NDIS multi-queue support is only in WS2012 or later. Check the NDIS
version to limit to single queue on older versions. Similar code
exists in Linux driver.

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

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
(cherry picked from commit d387b7ae45a520970ff55ea6ce75b48d5e69c4d9)
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 drivers/net/netvsc/hn_ethdev.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/netvsc/hn_ethdev.c b/drivers/net/netvsc/hn_ethdev.c
index b330bf3d7..1256fa399 100644
--- a/drivers/net/netvsc/hn_ethdev.c
+++ b/drivers/net/netvsc/hn_ethdev.c
@@ -732,6 +732,7 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev)
 	hv->chim_res  = &vmbus->resource[HV_SEND_BUF_MAP];
 	hv->port_id = eth_dev->data->port_id;
 	hv->latency = HN_CHAN_LATENCY_NS;
+	hv->max_queues = 1;
 
 	err = hn_parse_args(eth_dev);
 	if (err)
@@ -770,6 +771,10 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev)
 	if (err)
 		goto failed;
 
+	/* Multi queue requires later versions of windows server */
+	if (hv->nvs_ver < NVS_VERSION_5)
+		return 0;
+
 	max_chan = rte_vmbus_max_channels(vmbus);
 	PMD_INIT_LOG(DEBUG, "VMBus max channels %d", max_chan);
 	if (max_chan <= 0)
-- 
2.20.1