netdev - Re: [PATCH net-next 05/12] ipv4: ip_tunnel: Unmask upper DSCP bits in ip_tunnel_bind

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Message-ID: <ZtsHf-TrqA0EWfoj@shredder.lan>
Date: Fri, 6 Sep 2024 16:45:35 +0300
From: Ido Schimmel <idosch@...dia.com>
To: Guillaume Nault <gnault@...hat.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
	pabeni@...hat.com, edumazet@...gle.com, dsahern@...nel.org,
	razor@...ckwall.org, pablo@...filter.org, kadlec@...filter.org,
	marcelo.leitner@...il.com, lucien.xin@...il.com,
	bridge@...ts.linux.dev, netfilter-devel@...r.kernel.org,
	coreteam@...filter.org, linux-sctp@...r.kernel.org,
	bpf@...r.kernel.org
Subject: Re: [PATCH net-next 05/12] ipv4: ip_tunnel: Unmask upper DSCP bits
 in ip_tunnel_bind_dev()

On Fri, Sep 06, 2024 at 01:36:35PM +0200, Guillaume Nault wrote:
> On Thu, Sep 05, 2024 at 07:51:33PM +0300, Ido Schimmel wrote:
> > Unmask the upper DSCP bits when initializing an IPv4 flow key via
> > ip_tunnel_init_flow() before passing it to ip_route_output_key() so that
> > in the future we could perform the FIB lookup according to the full DSCP
> > value.
> > 
> > Signed-off-by: Ido Schimmel <idosch@...dia.com>
> > ---
> >  net/ipv4/ip_tunnel.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
> > index 18964394d6bd..b632c128ecb7 100644
> > --- a/net/ipv4/ip_tunnel.c
> > +++ b/net/ipv4/ip_tunnel.c
> > @@ -293,7 +293,7 @@ static int ip_tunnel_bind_dev(struct net_device *dev)
> >  
> >  		ip_tunnel_init_flow(&fl4, iph->protocol, iph->daddr,
> >  				    iph->saddr, tunnel->parms.o_key,
> > -				    RT_TOS(iph->tos), dev_net(dev),
> > +				    iph->tos & INET_DSCP_MASK, dev_net(dev),
> 
> The net/inet_dscp.h header file is only included in patch 6, while it's
> needed here in patch 5.

Thanks. Probably happened when I reordered the patches. However, it
doesn't affect bisectability since the header is included via include/net/ip.h

> 
> >  				    tunnel->parms.link, tunnel->fwmark, 0, 0);
> >  		rt = ip_route_output_key(tunnel->net, &fl4);
> >  
> > -- 
> > 2.46.0
> > 
>