From: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
To: Jibin Zhang <jibin.zhang@mediatek.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Eduard Zingerman <eddyz87@gmail.com>,
Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@fomichev.me>,
Hao Luo <haoluo@google.com>, Jiri Olsa <jolsa@kernel.org>,
"David S . Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>,
Paolo Abeni <pabeni@redhat.com>,
Simon Horman <horms@kernel.org>,
Neal Cardwell <ncardwell@google.com>,
Kuniyuki Iwashima <kuniyu@google.com>,
David Ahern <dsahern@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
bpf@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org,
steffen.klassert@secunet.com
Cc: wsd_upstream@mediatek.com, Jibin Zhang <jibin.zhang@mediatek.com>
Subject: Re: [PATCH v4] net: fix segmentation of forwarding fraglist GRO
Date: Mon, 26 Jan 2026 11:49:26 -0500 [thread overview]
Message-ID: <willemdebruijn.kernel.11a4b80935127@gmail.com> (raw)
In-Reply-To: <20260126152114.1211-1-jibin.zhang@mediatek.com>
[PATCH net v4]
Jibin Zhang wrote:
> This patch enhances GSO segment handling by properly checking
> the SKB_GSO_DODGY flag for frag_list GSO packets, addressing
> low throughput issues observed when a station accesses IPv4
> servers via hotspots with an IPv6-only upstream interface.
>
> Specifically, it fixes a bug in GSO segmentation when forwarding
> GRO packets containing a frag_list. The function skb_segment_list
> cannot correctly process GRO skbs that have been converted by XLAT,
> since XLAT only translates the header of the head skb. Consequently,
> skbs in the frag_list may remain untranslated, resulting in protocol
> inconsistencies and reduced throughput.
>
> To address this, the patch explicitly sets the SKB_GSO_DODGY flag
> for GSO packets in XLAT's IPv4/IPv6 protocol translation helpers
> (bpf_skb_proto_4_to_6 and bpf_skb_proto_6_to_4). This marks GSO
> packets as potentially modified after protocol translation. As a
> result, GSO segmentation will avoid using skb_segment_list and
> instead falls back to skb_segment for packets with the SKB_GSO_DODGY
> flag. This ensures that only safe and fully translated frag_list
> packets are processed by skb_segment_list, resolving protocol
> inconsistencies and improving throughput when forwarding GRO packets
> converted by XLAT.
Fixes: 9fd1ff5d2ac7 ("udp: Support UDP fraglist GRO/GSO.")
Cc: stable@vger.kernel.org
next prev parent reply other threads:[~2026-01-26 16:49 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-26 15:21 [PATCH v4] net: fix segmentation of forwarding fraglist GRO Jibin Zhang
2026-01-26 16:49 ` Willem de Bruijn [this message]
2026-01-29 13:50 ` patchwork-bot+netdevbpf
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