doc: don't suggest to disable GSO

The kernel can form aggregate packets whether or not GSO is enabled.
Disabling GSO is not a useful suggestion in this case.

Fixes: 05628cdd677d (doc: describe behaviour of {ip,ip6} length)
Signed-off-by: Florian Westphal <fw@strlen.de>

diff --git a/doc/payload-expression.txt b/doc/payload-expression.txt
index 351c79bce310dfaae49a3b074afbcbe789fdb65b..8b538968c84b52a1b1077c6996fc9f364dc2bbd7 100644 (file)
--- a/doc/payload-expression.txt
+++ b/doc/payload-expression.txt
@@ -134,13 +134,12 @@ Destination address |
 ipv4_addr
 |======================
 
-Careful with matching on *ip length*: If GRO/GSO is enabled, then the Linux
-kernel might aggregate several packets into one big packet that is larger than
-MTU. Moreover, if GRO/GSO maximum size is larger than 65535 (see man ip-link(8),
-specifically gro_ipv6_max_size and gso_ipv6_max_size), then *ip length* might
-be 0 for such jumbo packets. *meta length* allows you to match on the packet
-length including the IP header size.  If you want to perform heuristics on the
-*ip length* field, then disable GRO/GSO.
+Careful with matching on *ip length*: The Linux kernel might aggregate several
+packets into one big packet that is larger than MTU. Moreover, if GRO/GSO
+maximum size is larger than 65535 (see man ip-link(8), specifically
+gro_ipv4_max_size and gso_ipv4_max_size), then *ip length* might be 0 for such
+jumbo packets. *meta length* allows you to match on the packet length including
+the IP header size.
 
 ICMP HEADER EXPRESSION
 ~~~~~~~~~~~~~~~~~~~~~~
@@ -252,13 +251,12 @@ Destination address |
 ipv6_addr
 |=======================
 
-Careful with matching on *ip6 length*: If GRO/GSO is enabled, then the Linux
-kernel might aggregate several packets into one big packet that is larger than
-MTU. Moreover, if GRO/GSO maximum size is larger than 65535 (see man ip-link(8),
-specifically gro_ipv6_max_size and gso_ipv6_max_size), then *ip6 length* might
-be 0 for such jumbo packets. *meta length* allows you to match on the packet
-length including the IP header size.  If you want to perform heuristics on the
-*ip6 length* field, then disable GRO/GSO.
+Careful with matching on *ip6 length*: The Linux kernel might aggregate several
+packets into one big packet that is larger than MTU. Moreover, if GRO/GSO
+maximum size is larger than 65535 (see man ip-link(8), specifically
+gro_max_size and gso_max_size), then *ip6 length* might be 0 for such
+jumbo packets. *meta length* allows you to match on the packet length including
+the IPv6 header size.
 
 .Using ip6 header expressions
 -----------------------------