Re: [PATCH] net/filter: Enable the vnet_hdr_support by default

[Jason Wang]

On Wed, Nov 10, 2021 at 4:36 PM Markus Armbruster <armbru@redhat.com> wrote:
>
> "Zhang, Chen" <chen.zhang@intel.com> writes:
>
> >> -----Original Message-----
> >> From: Markus Armbruster <armbru@redhat.com>
> >> Sent: Wednesday, November 10, 2021 2:21 PM
> >> To: Zhang, Chen <chen.zhang@intel.com>
> >> Cc: Jason Wang <jasowang@redhat.com>; qemu-dev <qemu-
> >> devel@nongnu.org>; Li Zhijian <lizhijian@cn.fujitsu.com>
> >> Subject: Re: [PATCH] net/filter: Enable the vnet_hdr_support by default
> >>
> >> "Zhang, Chen" <chen.zhang@intel.com> writes:
> >>
> >> >> -----Original Message-----
> >> >> From: Markus Armbruster <armbru@redhat.com>
> >> >> Sent: Wednesday, November 10, 2021 1:07 PM
> >> >> To: Zhang, Chen <chen.zhang@intel.com>
> >> >> Cc: Jason Wang <jasowang@redhat.com>; qemu-dev <qemu-
> >> >> devel@nongnu.org>; Li Zhijian <lizhijian@cn.fujitsu.com>
> >> >> Subject: Re: [PATCH] net/filter: Enable the vnet_hdr_support by
> >> >> default
> >> >>
> >> >> Zhang Chen <chen.zhang@intel.com> writes:
> >> >>
> >> >> > This patch make filters and colo-compare module support vnet_hdr by
> >> >> > default. And also support -device non-virtio-net(like e1000.).
> >> >> > But it can't avoid user manual configuration error between
> >> >> > different filters when enable/disable virtio-net-pci.
> >> >> >
> >> >> > Signed-off-by: Zhang Chen <chen.zhang@intel.com>
> >> >>
> >> >> Have you considered backward compatibility?  Can it break usage that
> >> >> now works?
> >> >
> >> > Yes, this patch fully guarantees the compatibility as Jason's comments.
> >> > Original usage still works.
> >>
> >> Worth a brief explanation in the commit message?
> >
> > OK. Add following statement to commit message:
> > This patch make filters and colo-compare module support vnet_hdr by
> > default. And also support -device non-virtio-net(like e1000.). Because
> > when enabled the support will make the vnet_hdr_len field become 
> > must-delivery
> > part of filter transfer protocol(even 0 in use -device e1000). It fully 
> > guarantees the
> > compatibility for management layer like libvirt.
> > But it still can't avoid user manual configuration error between
> > different filters connected when enable/disable vnet_hdr_support.
> >
> > How about this explanation?
>
> I'm deferring to Jason, because I can't judge this for technical
> accuracy.

I think it should be fine.

Thanks

>
> > By the way, please let me know your comments on filter passthrough series:
> > https://mail.gnu.org/archive/html/qemu-devel/2021-08/msg01393.html
> > If OK, I will update it.
>
> Uh, I was under the impression that you'd respin with my comments
> addressed as per your reply to my review.
>
> It's too late for 6.2 now.  Suggest to respin, and adjust the "since:"
> tags to 7.0.
>