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Date: Sun, 14 Jul 2019 21:31:22 +0800 From: Haishuang Yan <yanhaishuang@...s.chinamobile.com> To: "David S. Miller" <davem@...emloft.net>, Alexey Kuznetsov <kuznet@....inr.ac.ru>, Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org> Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Haishuang Yan <yanhaishuang@...s.chinamobile.com> Subject: [PATCH] sit: use dst_cache in ipip6_tunnel_xmit Same as other ip tunnel, use dst_cache in xmit action to avoid unnecessary fib lookups. Signed-off-by: Haishuang Yan <yanhaishuang@...s.chinamobile.com> --- net/ipv6/sit.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c index 8061089..b2ccbc4 100644 --- a/net/ipv6/sit.c +++ b/net/ipv6/sit.c @@ -900,12 +900,17 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, 0, dst, tiph->saddr, 0, 0, sock_net_uid(tunnel->net, NULL)); - rt = ip_route_output_flow(tunnel->net, &fl4, NULL); - if (IS_ERR(rt)) { - dev->stats.tx_carrier_errors++; - goto tx_error_icmp; + rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr); + if (!rt) { + rt = ip_route_output_flow(tunnel->net, &fl4, NULL); + if (IS_ERR(rt)) { + dev->stats.tx_carrier_errors++; + goto tx_error_icmp; + } + dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr); } + if (rt->rt_type != RTN_UNICAST) { ip_rt_put(rt); dev->stats.tx_carrier_errors++; -- 1.8.3.1
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