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List: linux-netdev
Subject: Re: [patch net] udp6: respect IPV6_DONTFRAG sockopt in case there are pending frames
From: Hannes Frederic Sowa <hannes () stressinduktion ! org>
Date: 2013-09-30 21:21:55
Message-ID: 20130930212155.GG10771 () order ! stressinduktion ! org
[Download RAW message or body]
On Mon, Sep 30, 2013 at 07:56:40PM +0200, Hannes Frederic Sowa wrote:
> Hmm, I wonder if we need the same change in ipv6/raw.c.
Nope, ipv6/raw.c is fine.
> Looks good at first sight, but I need to do some more tests.
Strange, loopback traffic is not bound by the frag_size. This fixes it but
should not be necessary. Don't know the reason, yet.
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index a54c45c..9dd136e 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -124,7 +124,14 @@ static int ip6_finish_output2(struct sk_buff *skb)
static int ip6_finish_output(struct sk_buff *skb)
{
- if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) ||
+ int mtu;
+ struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
+
+ mtu = ip6_skb_dst_mtu(skb);
+ if (np && np->frag_size && np->frag_size < mtu)
+ mtu = np->frag_size;
+
+ if ((skb->len > mtu && !skb_is_gso(skb)) ||
dst_allfrag(skb_dst(skb)))
return ip6_fragment(skb, ip6_finish_output2);
else
Regarding your patch, this is fine by me:
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Thanks,
Hannes
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