On Wed, Aug 05, 2020 at 10:44:27AM +0200, Guillaume Nault wrote:
> On Wed, Aug 05, 2020 at 10:41:31AM +0800, Hangbin Liu wrote:
> > This reverts commit 71130f29979c7c7956b040673e6b9d5643003176.
> >
> > In commit 71130f29979c ("vxlan: fix tos value before xmit") we want to
> > make sure the tos value are filtered by RT_TOS() based on RFC1349.
> >
> > 0 1 2 3 4 5 6 7
> > +-----+-----+-----+-----+-----+-----+-----+-----+
> > | PRECEDENCE | TOS | MBZ |
> > +-----+-----+-----+-----+-----+-----+-----+-----+
> >
> > But RFC1349 has been obsoleted by RFC2474. The new DSCP field defined like
> >
> > 0 1 2 3 4 5 6 7
> > +-----+-----+-----+-----+-----+-----+-----+-----+
> > | DS FIELD, DSCP | ECN FIELD |
> > +-----+-----+-----+-----+-----+-----+-----+-----+
> >
> > So with
> >
> > IPTOS_TOS_MASK 0x1E
> > RT_TOS(tos) ((tos)&IPTOS_TOS_MASK)
> >
> > the first 3 bits DSCP info will get lost.
> >
> > To take all the DSCP info in xmit, we should revert the patch and just push
> > all tos bits to ip_tunnel_ecn_encap(), which will handling ECN field later.
> >
> > Signed-off-by: Hangbin Liu <liuhang...@gmail.com>
>
> I guess an explicit
> Fixes: 71130f29979c ("vxlan: fix tos value before xmit").
> tag would help the -stable maintainers.
>
> Apart from that,
> Acked-by: Guillaume Nault <gna...@redhat.com>
>
Thanks Guillaume. I saw some revert patches have the Fixes flag and some are
not, so I didn't add it.
Hi David,
Should I re-post the patch with Fixes flag?
Thanks
Hangbin
