From d2d68ba9fe8b38eb03124b3176a013bb8aa2b5e5 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Tue, 17 Jul 2012 12:58:50 -0700 Subject: [PATCH] ipv4: Cache input routes in fib_info nexthops. Caching input routes is slightly simpler than output routes, since we don't need to be concerned with nexthop exceptions. (locally destined, and routed packets, never trigger PMTU events or redirects that will be processed by us). However, we have to elide caching for the DIRECTSRC and non-zero itag cases. Signed-off-by: David S. Miller --- include/net/ip_fib.h | 1 + net/ipv4/fib_semantics.c | 2 ++ net/ipv4/route.c | 55 +++++++++++++++++++++++++++++++--------- 3 files changed, 46 insertions(+), 12 deletions(-) diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h index fb62c590360e..e69c3a47153d 100644 --- a/include/net/ip_fib.h +++ b/include/net/ip_fib.h @@ -82,6 +82,7 @@ struct fib_nh { __be32 nh_saddr; int nh_saddr_genid; struct rtable *nh_rth_output; + struct rtable *nh_rth_input; struct fnhe_hash_bucket *nh_exceptions; }; diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c index 83d0f42b619a..e55171f184f9 100644 --- a/net/ipv4/fib_semantics.c +++ b/net/ipv4/fib_semantics.c @@ -173,6 +173,8 @@ static void free_fib_info_rcu(struct rcu_head *head) free_nh_exceptions(nexthop_nh); if (nexthop_nh->nh_rth_output) dst_release(&nexthop_nh->nh_rth_output->dst); + if (nexthop_nh->nh_rth_input) + dst_release(&nexthop_nh->nh_rth_input->dst); } endfor_nexthops(fi); release_net(fi->fib_net); diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 8a0260010ea1..97cca8a03d94 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -1231,6 +1231,9 @@ static void rt_cache_route(struct fib_nh *nh, struct rtable *rt) { struct rtable *orig, *prev, **p = &nh->nh_rth_output; + if (rt_is_input_route(rt)) + p = &nh->nh_rth_input; + orig = *p; prev = cmpxchg(p, orig, rt); @@ -1241,6 +1244,11 @@ static void rt_cache_route(struct fib_nh *nh, struct rtable *rt) } } +static bool rt_cache_valid(struct rtable *rt) +{ + return (rt && rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK); +} + static void rt_set_nexthop(struct rtable *rt, __be32 daddr, const struct fib_result *res, struct fib_nh_exception *fnhe, @@ -1257,8 +1265,7 @@ static void rt_set_nexthop(struct rtable *rt, __be32 daddr, #ifdef CONFIG_IP_ROUTE_CLASSID rt->dst.tclassid = nh->nh_tclassid; #endif - if (!(rt->dst.flags & DST_HOST) && - rt_is_output_route(rt)) + if (!(rt->dst.flags & DST_HOST)) rt_cache_route(nh, rt); } @@ -1384,11 +1391,11 @@ static int __mkroute_input(struct sk_buff *skb, __be32 daddr, __be32 saddr, u32 tos, struct rtable **result) { - struct fib_nh_exception *fnhe; struct rtable *rth; int err; struct in_device *out_dev; unsigned int flags = 0; + bool do_cache; u32 itag; /* get a working reference to the output device */ @@ -1431,13 +1438,21 @@ static int __mkroute_input(struct sk_buff *skb, } } - fnhe = NULL; - if (res->fi) - fnhe = find_exception(&FIB_RES_NH(*res), daddr); + do_cache = false; + if (res->fi) { + if (!(flags & RTCF_DIRECTSRC) && !itag) { + rth = FIB_RES_NH(*res).nh_rth_input; + if (rt_cache_valid(rth)) { + dst_use(&rth->dst, jiffies); + goto out; + } + do_cache = true; + } + } rth = rt_dst_alloc(out_dev->dev, IN_DEV_CONF_GET(in_dev, NOPOLICY), - IN_DEV_CONF_GET(out_dev, NOXFRM), false); + IN_DEV_CONF_GET(out_dev, NOXFRM), do_cache); if (!rth) { err = -ENOBUFS; goto cleanup; @@ -1456,8 +1471,8 @@ static int __mkroute_input(struct sk_buff *skb, rth->dst.input = ip_forward; rth->dst.output = ip_output; - rt_set_nexthop(rth, daddr, res, fnhe, res->fi, res->type, itag); - + rt_set_nexthop(rth, daddr, res, NULL, res->fi, res->type, itag); +out: *result = rth; err = 0; cleanup: @@ -1509,6 +1524,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, struct rtable *rth; int err = -EINVAL; struct net *net = dev_net(dev); + bool do_cache; /* IP on this device is disabled. */ @@ -1522,6 +1538,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) goto martian_source; + res.fi = NULL; if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0)) goto brd_input; @@ -1597,8 +1614,20 @@ out: return err; RT_CACHE_STAT_INC(in_brd); local_input: + do_cache = false; + if (res.fi) { + if (!(flags & RTCF_DIRECTSRC) && !itag) { + rth = FIB_RES_NH(res).nh_rth_input; + if (rt_cache_valid(rth)) { + dst_use(&rth->dst, jiffies); + goto set_and_out; + } + do_cache = true; + } + } + rth = rt_dst_alloc(net->loopback_dev, - IN_DEV_CONF_GET(in_dev, NOPOLICY), false, false); + IN_DEV_CONF_GET(in_dev, NOPOLICY), false, do_cache); if (!rth) goto e_nobufs; @@ -1622,6 +1651,9 @@ out: return err; rth->dst.error= -err; rth->rt_flags &= ~RTCF_LOCAL; } + if (do_cache) + rt_cache_route(&FIB_RES_NH(res), rth); +set_and_out: skb_dst_set(skb, &rth->dst); err = 0; goto out; @@ -1756,8 +1788,7 @@ static struct rtable *__mkroute_output(const struct fib_result *res, fnhe = find_exception(&FIB_RES_NH(*res), fl4->daddr); if (!fnhe) { rth = FIB_RES_NH(*res).nh_rth_output; - if (rth && - rth->dst.obsolete == DST_OBSOLETE_FORCE_CHK) { + if (rt_cache_valid(rth)) { dst_use(&rth->dst, jiffies); return rth; } -- GitLab