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From 0598625d2e17374b7d5693972f5acb59fef25f63 Mon Sep 17 00:00:00 2001
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From: Stephen Hemminger <sthemmin@microsoft.com>
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Date: Wed, 5 Dec 2018 14:11:58 -0800
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Subject: [PATCH 3/3] net/netvsc: disable multi-queue on older servers
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[ upstream commit afbc22bf51ab98b9b61b11eb6d38278a9d577111 ]
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NDIS multi-queue support is only in WS2012 or later. Check the NDIS
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version to limit to single queue on older versions. Similar code
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exists in Linux driver.
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Fixes: 4e9c73e96e83 ("net/netvsc: add Hyper-V network device")
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Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
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(cherry picked from commit d387b7ae45a520970ff55ea6ce75b48d5e69c4d9)
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Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
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---
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drivers/net/netvsc/hn_ethdev.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/drivers/net/netvsc/hn_ethdev.c b/drivers/net/netvsc/hn_ethdev.c
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index b330bf3d7..1256fa399 100644
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--- a/drivers/net/netvsc/hn_ethdev.c
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+++ b/drivers/net/netvsc/hn_ethdev.c
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@@ -732,6 +732,7 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev)
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hv->chim_res = &vmbus->resource[HV_SEND_BUF_MAP];
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hv->port_id = eth_dev->data->port_id;
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hv->latency = HN_CHAN_LATENCY_NS;
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+ hv->max_queues = 1;
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err = hn_parse_args(eth_dev);
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if (err)
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@@ -770,6 +771,10 @@ eth_hn_dev_init(struct rte_eth_dev *eth_dev)
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if (err)
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goto failed;
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+ /* Multi queue requires later versions of windows server */
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+ if (hv->nvs_ver < NVS_VERSION_5)
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+ return 0;
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+
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max_chan = rte_vmbus_max_channels(vmbus);
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PMD_INIT_LOG(DEBUG, "VMBus max channels %d", max_chan);
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if (max_chan <= 0)
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--
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2.20.1
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