ipv6: convert rx data path to not take refcnt on dst

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ip6_route_input() is the key function to do the route lookup in the
rx data path. All the callers to this function are already holding rcu
lock. So it is fairly easy to convert it to not take refcnt on the dst:
We pass in flag RT6_LOOKUP_F_DST_NOREF and do skb_dst_set_noref().
This saves a few atomic inc or dec operations and should boost
performance overall.
This also makes the logic more aligned with v4.

Signed-off-by: Wei Wang <weiwan@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Wei Wang 2019-06-20 17:36:40 -07:00 • committed by David S. Miller

parent d64a1f574a

commit 67f415dd29

1 changed files with 4 additions and 3 deletions

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net/ipv6/route.c

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