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

Note that this patch should be based on
patch "Vhost-vdpa Shadow Virtqueue Hash calculation Support" at [1].

[1]. https://lore.kernel.org/all/cover.1693297766.git.yin31149@gmail.com/

TestStep
========
1. test the migration using vp-vdpa device
  - For L0 guest, boot QEMU with two virtio-net-pci net device with
`in-qemu` RSS, command line like:
	-netdev tap,vhost=off...
	-device virtio-net-pci,disable-legacy=on,disable-modern=off,
iommu_platform=on,mq=on,ctrl_vq=on,hash=on,rss=on,guest_announce=off,
indirect_desc=off,queue_reset=off,...

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

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

ethtool -K eth0 rxhash on
```

  - Execute the live migration in L2 source monitor

  - Result
    * with this series, L2 QEMU can execute without
triggering any error or warning. L0 QEMU echo
"Can't load eBPF RSS - fallback to software RSS".

ChangeLog
=========
v3:
  - resolve conflict with updated patch
"Vhost-vdpa Shadow Virtqueue Hash calculation Support" in patch
"vdpa: Restore receive-side scaling state"

RFC v2: https://lore.kernel.org/all/cover.1691926415.git.yin31149@gmail.com/
  - Correct the feature usage to VIRTIO_NET_F_HASH_REPORT when
loading the hash calculation state in
patch "vdpa: Restore receive-side scaling state"

RFC v1: https://lore.kernel.org/all/cover.1691766252.git.yin31149@gmail.com/

Hawkins Jiawei (3):
  vdpa: Add SetSteeringEBPF method for NetClientState
  vdpa: Restore receive-side scaling state
  vdpa: Allow VIRTIO_NET_F_RSS in SVQ

 net/vhost-vdpa.c | 63 ++++++++++++++++++++++++++++++++++--------------
 1 file changed, 45 insertions(+), 18 deletions(-)

-- 
2.25.1

On Tue, Aug 29, 2023 at 05:11:14PM +0800, Hawkins Jiawei wrote:
> This series enables shadowed CVQ to intercept RSS command
> through shadowed CVQ, update the virtio NIC device model
> so qemu send it in a migration, and the restore of that
> RSS state in the destination.
> 
> Note that this patch should be based on
> patch "Vhost-vdpa Shadow Virtqueue Hash calculation Support" at [1].
> 
> [1]. https://lore.kernel.org/all/cover.1693297766.git.yin31149@gmail.com/

dropped due to dependency.

> TestStep
> ========
> 1. test the migration using vp-vdpa device
>   - For L0 guest, boot QEMU with two virtio-net-pci net device with
> `in-qemu` RSS, command line like:
> 	-netdev tap,vhost=off...
> 	-device virtio-net-pci,disable-legacy=on,disable-modern=off,
> iommu_platform=on,mq=on,ctrl_vq=on,hash=on,rss=on,guest_announce=off,
> indirect_desc=off,queue_reset=off,...
> 
>   - For L1 guest, apply the relative patch series and compile the
> source code, start QEMU with two vdpa device with svq mode on,
> enable the `ctrl_vq`, `mq`, `rss` features on, command line like:
>       -netdev type=vhost-vdpa,x-svq=true,...
>       -device virtio-net-pci,mq=on,guest_announce=off,ctrl_vq=on,
> rss=on,...
> 
>   - For L2 source guest, run the following bash command:
> ```bash
> #!/bin/sh
> 
> ethtool -K eth0 rxhash on
> ```
> 
>   - Execute the live migration in L2 source monitor
> 
>   - Result
>     * with this series, L2 QEMU can execute without
> triggering any error or warning. L0 QEMU echo
> "Can't load eBPF RSS - fallback to software RSS".
> 
> ChangeLog
> =========
> v3:
>   - resolve conflict with updated patch
> "Vhost-vdpa Shadow Virtqueue Hash calculation Support" in patch
> "vdpa: Restore receive-side scaling state"
> 
> RFC v2: https://lore.kernel.org/all/cover.1691926415.git.yin31149@gmail.com/
>   - Correct the feature usage to VIRTIO_NET_F_HASH_REPORT when
> loading the hash calculation state in
> patch "vdpa: Restore receive-side scaling state"
> 
> RFC v1: https://lore.kernel.org/all/cover.1691766252.git.yin31149@gmail.com/
> 
> Hawkins Jiawei (3):
>   vdpa: Add SetSteeringEBPF method for NetClientState
>   vdpa: Restore receive-side scaling state
>   vdpa: Allow VIRTIO_NET_F_RSS in SVQ
> 
>  net/vhost-vdpa.c | 63 ++++++++++++++++++++++++++++++++++--------------
>  1 file changed, 45 insertions(+), 18 deletions(-)
> 
> -- 
> 2.25.1