[PATCH v2 0/4] Vhost-vdpa Shadow Virtqueue VLAN support

[Hawkins Jiawei <yin31149@gmail.com>]

This series enables shadowed CVQ to intercept VLAN commands
through shadowed CVQ, update the virtio NIC device model
so qemu send it in a migration, and the restore of that
VLAN state in the destination.

ChangeLog
=========
v2:
 - remove the extra line pointed out by Eugenio in patch 3
"vdpa: Restore vlan filtering state"

v1: https://lore.kernel.org/all/cover.1689690854.git.yin31149@gmail.com/
 - based on patch "[PATCH 0/3] Vhost-vdpa Shadow Virtqueue VLAN support"
at https://lists.gnu.org/archive/html/qemu-devel/2022-09/msg01016.html
 - move `MAX_VLAN` macro to include/hw/virtio/virtio-net.h
instead of net/vhost-vdpa.c
 - fix conflicts with the master branch


TestStep
========
1. test the migration using vp-vdpa device
  - For L0 guest, boot QEMU with two virtio-net-pci net device with
`ctrl_vq`, `ctrl_vlan` features on, command line like:
      -device virtio-net-pci,disable-legacy=on,disable-modern=off,
iommu_platform=on,mq=on,ctrl_vq=on,guest_announce=off,
indirect_desc=off,queue_reset=off,ctrl_vlan=on,...

  - For L1 guest, apply the patch series and compile the source code,
start QEMU with two vdpa device with svq mode on, enable the `ctrl_vq`,
`ctrl_vlan` features on, command line like:
      -netdev type=vhost-vdpa,x-svq=true,...
      -device virtio-net-pci,mq=on,guest_announce=off,ctrl_vq=on,
ctrl_vlan=on,...

  - For L2 source guest, run the following bash command:
```bash
#!/bin/sh

for idx in {1..4094}
do
  ip link add link eth0 name vlan$idx type vlan id $idx
done
```

  - gdb attaches the L2 dest VM and break at the
vhost_vdpa_net_load_single_vlan(), and execute the following
gdbscript
```gdbscript
ignore 1 4094
c
```

  - Execute the live migration in L2 source monitor

  - Result
    * with this series, gdb can hit the breakpoint and continue
the executing without triggering any error or warning.

Eugenio Pérez (1):
  virtio-net: do not reset vlan filtering at set_features

Hawkins Jiawei (3):
  virtio-net: Expose MAX_VLAN
  vdpa: Restore vlan filtering state
  vdpa: Allow VIRTIO_NET_F_CTRL_VLAN in SVQ

 hw/net/virtio-net.c            |  6 +----
 include/hw/virtio/virtio-net.h |  6 +++++
 net/vhost-vdpa.c               | 49 ++++++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+), 5 deletions(-)

-- 
2.25.1