From: Xin Long Date: Mon, 19 Feb 2024 19:16:04 +0000 (-0500) Subject: man: ip-link.8: add a note for gso_ipv4_max_size X-Git-Tag: v6.8.0~7 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1d7f908103be90e8ac836ef0ce03b72997664b5a;p=thirdparty%2Fiproute2.git 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 Signed-off-by: Xin Long --- diff --git a/man/man8/ip-link.8.in b/man/man8/ip-link.8.in index dd686ae1..31e2d7f0 100644 --- a/man/man8/ip-link.8.in +++ b/man/man8/ip-link.8.in @@ -445,6 +445,11 @@ 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 "