From: Florian Westphal <fw@strlen.de>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Eric Dumazet <eric.dumazet@gmail.com>,
Florian Westphal <fw@strlen.de>,
netdev@vger.kernel.org
Subject: Re: [PATCH 2/2] net: ip, ipv6: handle gso skbs in forwarding path
Date: Mon, 10 Feb 2014 13:23:31 +0100 [thread overview]
Message-ID: <20140210122331.GA25153@breakpoint.cc> (raw)
In-Reply-To: <20140209025504.GB17395@gondor.apana.org.au>
Herbert Xu <herbert@gondor.apana.org.au> wrote:
> > > static void ip_gso_adjust_seglen(struct sk_buff *skb)
> > > {
> > > unsigned int mtu;
> > >
> > > if (!skb_is_gso(skb))
> > > return;
> > >
> > > mtu = ip_dst_mtu_maybe_forward(skb_dst(skb), true);
> > > skb_shinfo(skb)->gso_size = mtu - sizeof(struct iphdr);
> > > }
> > >
> > > But this yields
> > >
> > > [ 28.644776] kernel BUG at net/net/core/skbuff.c:2984!
> >
> > Yep, lets CC Herbert Xu, as he 'owns' skb_segment()
>
> IMHO we should just stop merging ~DF packets altogether, at least
> for TCP.
Eric, you added DF aggregation in db8caf3dbc77599dc90f4ea0a803cd1d97116f30
(gro: should aggregate frames without DF).
I guess you don't want to revert this commit?
Any other ideas?
skb_gso_segment() is already very complex, I don't want to add more code
to it. And that seems unavoidable if we need to de-couple nr_frags and
gso_size.
next prev parent reply other threads:[~2014-02-10 12:23 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-27 8:22 [PATCH 1/2] net: add and use skb_gso_transport_seglen() Florian Westphal
2014-01-27 8:22 ` [PATCH 2/2] net: ip, ipv6: handle gso skbs in forwarding path Florian Westphal
2014-01-27 8:34 ` David Miller
2014-01-27 8:36 ` Florian Westphal
2014-01-27 18:22 ` Eric Dumazet
2014-01-27 20:58 ` David Miller
2014-01-27 21:08 ` David Miller
2014-01-28 0:27 ` Hannes Frederic Sowa
2014-01-28 9:12 ` Florian Westphal
2014-01-29 10:53 ` Florian Westphal
2014-01-29 11:04 ` Hannes Frederic Sowa
2014-01-28 8:57 ` Florian Westphal
2014-01-28 16:34 ` Eric Dumazet
2014-01-28 17:15 ` Florian Westphal
2014-01-28 17:30 ` Eric Dumazet
2014-01-28 17:37 ` Florian Westphal
2014-01-29 11:00 ` Florian Westphal
2014-02-09 2:55 ` Herbert Xu
2014-02-10 12:23 ` Florian Westphal [this message]
2014-02-10 12:31 ` Herbert Xu
2014-02-10 12:43 ` Florian Westphal
2014-02-10 12:50 ` Herbert Xu
2014-02-10 13:08 ` Eric Dumazet
2014-02-10 13:15 ` Eric Dumazet
2014-02-10 13:12 ` Eric Dumazet
2014-01-27 8:30 ` [PATCH 1/2] net: add and use skb_gso_transport_seglen() David Miller
-- strict thread matches above, loose matches on Subject: below --
2014-02-22 9:33 [PATCH stable 3.4.y 0/2] gso/gro forwarding changeset Florian Westphal
2014-02-22 9:33 ` [PATCH 2/2] net: ip, ipv6: handle gso skbs in forwarding path Florian Westphal
2014-01-25 22:48 [PATCH 0/2] Fix handling of GRO " Florian Westphal
2014-01-25 22:48 ` [PATCH 2/2] net: ip, ipv6: handle gso " Florian Westphal
2014-01-26 1:37 ` Eric Dumazet
2014-01-26 9:22 ` Florian Westphal
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