netdev - Re: [PATCH] ipv6: udp packets following an UFO enqueued packet need also be handled by UFO

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Message-ID: <20131002121207.GO10771@order.stressinduktion.org>
Date:	Wed, 2 Oct 2013 14:12:07 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org,
	yoshfuji@...ux-ipv6.org, davem@...emloft.net, kuznet@....inr.ac.ru,
	jmorris@...ei.org, kaber@...sh.net, herbert@...dor.apana.org.au
Subject: Re: [PATCH] ipv6: udp packets following an UFO enqueued packet need also be handled by UFO

Hi Eric!

On Wed, Oct 02, 2013 at 03:41:28AM -0700, Eric Dumazet wrote:
> On Wed, 2013-10-02 at 10:58 +0200, Jiri Pirko wrote:
> > Wed, Oct 02, 2013 at 01:25:34AM CEST, hannes@...essinduktion.org wrote:
> > >-	if (((length > mtu) || (skb && skb_is_gso(skb))) &&
> > >+	if (((length > mtu) || (skb && skb_has_frags(skb))) &&
> 
> > 
> > This seems correct to me. sk_is_gso would work as well is you apply my
> > patch "[patch net] ip6_output: do skb ufo init for peeked non ufo skb as
> > well" which does the setting of gso_size.
> 
> Well, skb having frags or not should not be a concern :
> Thats an allocation choice (lets say to avoid high order allocations). 
> 
> Setting gso_size is probably better.

e89e9cf539a28df7d0eb1d0a545368e9920b34ac ("[IPv4/IPv6]: UFO Scatter-gather
approach") states:

"
skb->data will contain MAC/IP/UDP header and skb_shinfo(skb)->frags[]
contains the data payload. The skb->ip_summed will be set to CHECKSUM_HW
indicating that hardware has to do checksum calculation. Hardware should
compute the UDP checksum of complete datagram and also ip header checksum of
each fragmented IP packet.
"

This is the reason why I tried not to update the gso_size. If it is ok, I am
fine with that.

Greetings,

  Hannes

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