[dpdk-dev] [PATCH v2 3/4] net/netvsc: disable multi-queue on older servers

[Stephen Hemminger <stephen@networkplumber.org>]

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>
---
 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 b330bf3d7255..1256fa399b16 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)
-- 
2.19.2