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From c18b2f65e0a3be55e30fc3df6062e00353dfdb26 Mon Sep 17 00:00:00 2001
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Wed, 31 Jan 2018 17:46:51 +0000
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Subject: [PATCH 6/6] vhost: drop virtqueues only with built-in virtio driver
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Commit e29109323595beb3884da58126ebb3b878cb66f5 ("vhost: destroy unused
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virtqueues when multiqueue not negotiated") broke vhost-scsi by removing
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virtqueues when the virtio-net-specific VIRTIO_NET_F_MQ feature bit is
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missing.
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The vhost_user.c code shouldn't assume all devices are vhost net device
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backends. Use the new VIRTIO_DEV_BUILTIN_VIRTIO_NET flag to check
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whether virtio_net.c is being used.
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This fixes examples/vhost_scsi.
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
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Acked-by: Yuanhan Liu <yliu@fridaylinux.org>
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(cherry picked from commit 33adfbc805651f455dbf19f1e4b4b0878717a5e5)
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Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
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---
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dpdk-17.11/lib/librte_vhost/vhost_user.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
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index 1848c8de9..f334497d4 100644
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--- a/lib/librte_vhost/vhost_user.c
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+++ b/lib/librte_vhost/vhost_user.c
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@@ -216,7 +216,8 @@ vhost_user_set_features(struct virtio_net *dev, uint64_t features)
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(dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off",
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(dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off");
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- if (!(dev->features & (1ULL << VIRTIO_NET_F_MQ))) {
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+ if ((dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET) &&
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+ !(dev->features & (1ULL << VIRTIO_NET_F_MQ))) {
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/*
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* Remove all but first queue pair if MQ hasn't been
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* negotiated. This is safe because the device is not
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--
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2.14.3
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