From: Simon Horman <horms@kernel.org>
To: Julius Bairaktaris <julius@bairaktaris.de>
Cc: netdev@vger.kernel.org, dsahern@kernel.org, idosch@nvidia.com,
davem@davemloft.net, edumazet@kernel.org, kuba@kernel.org,
pabeni@redhat.com, steffen.klassert@secunet.com,
willemb@google.com, jiayuan.chen@linux.dev,
mfleming@cloudflare.com, almasrymina@google.com,
bigeasy@linutronix.de, richardbgobert@gmail.com,
ecree.xilinx@gmail.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH net v4 2/4] net: gso: count the inner UDP header of encapsulated UDP GSO packets
Date: Tue, 3 Nov 2026 12:44:00 +0000 [thread overview]
Message-ID: <20261103124400.GK865646@horms.kernel.org> (raw)
In-Reply-To: <7b6a12fbe0853f7faf2987610e25957d2017bd54.1792838740.git.julius@bairaktaris.de>
On Sun, Nov 01, 2026 at 05:42:30PM +0100, Julius Bairaktaris wrote:
> skb_gso_transport_seglen() adds the inner TCP header length for an
> encapsulated GSO packet, but not the inner UDP header for
> SKB_GSO_UDP_L4, whose gso_size covers the payload only. Every segment
> of a UDP GSO packet in a UDP tunnel, built by UDP GRO behind a tunnel
> socket or sent with UDP_SEGMENT over VXLAN, is counted 8 bytes short.
> ip_forward() and ip_finish_output_gso() then let DF segments that
> exceed the MTU by up to 8 bytes leave unfragmented.
>
> Add the inner UDP header as the unencapsulated branch does.
>
> Fixes: ee80d1ebe5ba ("udp: add udp gso")
> Signed-off-by: Julius Bairaktaris <julius@bairaktaris.de>
Reviewed-by: Simon Horman <horms@kernel.org>
next prev parent reply other threads:[~2026-11-03 12:44 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-01 16:42 [PATCH net v4 0/4] ipmr: forward GSO multicast packets Julius Bairaktaris
2026-11-01 16:42 ` [PATCH net v4 1/4] net: make room for the tunnel header in skb_segment_list() Julius Bairaktaris
2026-11-03 12:43 ` Simon Horman
2026-11-03 13:05 ` Eric Dumazet
2026-11-01 16:42 ` [PATCH net v4 2/4] net: gso: count the inner UDP header of encapsulated UDP GSO packets Julius Bairaktaris
2026-11-03 12:44 ` Simon Horman [this message]
2026-11-03 13:08 ` Eric Dumazet
2026-11-01 16:42 ` [PATCH net v4 3/4] ipmr: set up GSO state for tunnel vifs Julius Bairaktaris
2026-11-03 12:44 ` Simon Horman
2026-11-03 13:13 ` Eric Dumazet
2026-11-01 16:42 ` [PATCH net v4 4/4] ipmr: do not drop GSO packets that fit the MTU after segmentation Julius Bairaktaris
2026-11-03 12:44 ` Simon Horman
2026-11-03 13:15 ` Eric Dumazet
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