virtio_net: merge dma operations when filling mergeable buffers

Eric Augerrequested to merge
eauger1/centos-stream-9:vhost-scp-fix into main

JIRA: https://issues.redhat.com/browse/RHEL-3230 Status: Upstream Tested: on HPE RL300 with enhanced guest using virtio-iommu. Vhost=on.

Backport [PATCH vhost v13 00/12] virtio core prepares for AF_XDP + related fixes as this fixes severer performance issues on guest side with vhost and virtio-iommu.

d12a26b74fb7 ("virtio_net: avoid data-races on dev->stats fields") is backported to avoid conflicts. Only "virtio_net: fix missing dma unmap for resize" features a small content upstream, ie.

Omitted-fix: d2c4f1928a3f (I don't really get why I see 2 commits with the same content, ie.

2311e06b9bf3 virtio_net: fix missing dma unmap for resize (8 months ago) d2c4f1928a3f virtio_net: fix missing dma unmap for resize (8 months ago)

Signed-off-by: Eric Auger eric.auger@redhat.com

Edited by Eric Auger

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