ipv6: add some unlikely()/likely() clauses in ip6_output.c

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1) daddr is unlikely a multicast in ip6_finish_output2().

2) ip6_finish_output_gso_slowpath_drop() should not be called often.

3) ip6_fragment() should not be called often.

4) opt is unlikely to be set.

5) ip6_xmit() and ip6_forward() mostly sends not too big packets.

6) Most __ip6_make_skb() calls are for UDP packets,
   not ICMPV6 ones.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260130210303.3888261-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Eric Dumazet 2026-01-30 21:02:57 +00:00 • committed by Jakub Kicinski

parent 1bc46dd209

commit 2855e49254

1 changed files with 12 additions and 12 deletions

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net/ipv6/ip6_output.c

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