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| author | Eric Dumazet <edumazet@google.com> | 2017-10-07 19:30:28 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-10-08 21:16:31 -0700 |
| commit | cc429c8f6fa7cc1c9109bb4a1ad63a6d1f232f0e (patch) | |
| tree | e7e9727cc24309c0a4e667920f8cba37186d4b22 /net | |
| parent | f59c031e9134bb16c38980196a73d7ba40979baa (diff) | |
| download | linux-cc429c8f6fa7cc1c9109bb4a1ad63a6d1f232f0e.tar.bz2 | |
ipv6: avoid cache line dirtying in ipv6_dev_get_saddr()
By extending the rcu section a bit, we can avoid these
very expensive in6_ifa_put()/in6_ifa_hold() calls
done in __ipv6_dev_get_saddr() and ipv6_dev_get_saddr()
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/addrconf.c | 17 |
1 files changed, 6 insertions, 11 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 20c3ca777529..cab3faad2bf1 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -1608,11 +1608,6 @@ static int __ipv6_dev_get_saddr(struct net *net, } break; } else if (minihiscore < miniscore) { - if (hiscore->ifa) - in6_ifa_put(hiscore->ifa); - - in6_ifa_hold(score->ifa); - swap(hiscore, score); hiscore_idx = 1 - hiscore_idx; @@ -1660,6 +1655,7 @@ int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, int dst_type; bool use_oif_addr = false; int hiscore_idx = 0; + int ret = 0; dst_type = __ipv6_addr_type(daddr); dst.addr = daddr; @@ -1735,15 +1731,14 @@ int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, } out: - rcu_read_unlock(); - hiscore = &scores[hiscore_idx]; if (!hiscore->ifa) - return -EADDRNOTAVAIL; + ret = -EADDRNOTAVAIL; + else + *saddr = hiscore->ifa->addr; - *saddr = hiscore->ifa->addr; - in6_ifa_put(hiscore->ifa); - return 0; + rcu_read_unlock(); + return ret; } EXPORT_SYMBOL(ipv6_dev_get_saddr); |