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Message-Id: <76a426018ec585c7dc40148fc832746e119dae60.1708370164.git.lucien.xin@gmail.com> Date: Mon, 19 Feb 2024 14:16:04 -0500 From: Xin Long <lucien.xin@...il.com> To: network dev <netdev@...r.kernel.org>, David Ahern <dsahern@...il.com>, stephen@...workplumber.org Cc: Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com> Subject: [PATCH iproute2] man: ip-link.8: add a note for gso_ipv4_max_size As Paolo noticed, a skb->len check against gso_max_size was added in: https://lore.kernel.org/netdev/20231219125331.4127498-1-edumazet@google.com/ gso_max_size needs to be set to a value greater than or equal to gso_ipv4_max_size to make BIG TCP IPv4 work properly. To not break the current setup, this patch just adds a note into its man doc for this. Reported-by: Xiumei Mu <xmu@...hat.com> Signed-off-by: Xin Long <lucien.xin@...il.com> --- man/man8/ip-link.8.in | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/man/man8/ip-link.8.in b/man/man8/ip-link.8.in index c8c65657..444e7bca 100644 --- a/man/man8/ip-link.8.in +++ b/man/man8/ip-link.8.in @@ -441,6 +441,11 @@ TCP for IPv6 on this device when the size is greater than 65536. specifies the recommended maximum size of a IPv4 Generic Segment Offload packet the new device should accept. This is especially used to enable BIG TCP for IPv4 on this device by setting to a size greater than 65536. +Note that +.B gso_max_size +needs to be set to a size greater than or equal to +.B gso_ipv4_max_size +to really enable BIG TCP for IPv4. .TP .BI gso_max_segs " SEGMENTS " -- 2.39.1
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