summaryrefslogtreecommitdiff
path: root/net
diff options
context:
space:
mode:
authorEric Dumazet <eric.dumazet@gmail.com>2010-09-30 03:33:58 +0000
committerDavid S. Miller <davem@davemloft.net>2010-09-30 21:16:06 -0700
commit0197aa38df2ce550c0bfc96194b07ce6b68af814 (patch)
treebf7f41be7e701f6e282ed92e8063e69d339554f8 /net
parent82efee1499a27c06f5afb11b07db384fdb3f7004 (diff)
ipv4: rcu conversion in ip_route_output_slow
ip_route_output_slow() is enclosed in an rcu_read_lock() protected section, so that no references are taken/released on device, thanks to __ip_dev_find() & dev_get_by_index_rcu() Tested with ip route cache disabled, and a stress test : Before patch: elapsed time : real 1m38.347s user 0m11.909s sys 23m51.501s Profile: 13788.00 22.7% ip_route_output_slow [kernel] 7875.00 13.0% dst_destroy [kernel] 3925.00 6.5% fib_semantic_match [kernel] 3144.00 5.2% fib_rules_lookup [kernel] 3061.00 5.0% dst_alloc [kernel] 2276.00 3.7% rt_set_nexthop [kernel] 1762.00 2.9% fib_table_lookup [kernel] 1538.00 2.5% _raw_read_lock [kernel] 1358.00 2.2% ip_output [kernel] After patch: real 1m28.808s user 0m13.245s sys 20m37.293s 10950.00 17.2% ip_route_output_slow [kernel] 10726.00 16.9% dst_destroy [kernel] 5170.00 8.1% fib_semantic_match [kernel] 3937.00 6.2% dst_alloc [kernel] 3635.00 5.7% rt_set_nexthop [kernel] 2900.00 4.6% fib_rules_lookup [kernel] 2240.00 3.5% fib_table_lookup [kernel] 1427.00 2.2% _raw_read_lock [kernel] 1157.00 1.8% kmem_cache_alloc [kernel] Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/route.c38
1 files changed, 12 insertions, 26 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index ea895004caf3..a61acea975f1 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2487,6 +2487,7 @@ static int ip_mkroute_output(struct rtable **rp,
/*
* Major route resolver routine.
+ * called with rcu_read_lock();
*/
static int ip_route_output_slow(struct net *net, struct rtable **rp,
@@ -2505,7 +2506,7 @@ static int ip_route_output_slow(struct net *net, struct rtable **rp,
.iif = net->loopback_dev->ifindex,
.oif = oldflp->oif };
struct fib_result res;
- unsigned flags = 0;
+ unsigned int flags = 0;
struct net_device *dev_out = NULL;
int free_res = 0;
int err;
@@ -2535,7 +2536,7 @@ static int ip_route_output_slow(struct net *net, struct rtable **rp,
(ipv4_is_multicast(oldflp->fl4_dst) ||
oldflp->fl4_dst == htonl(0xFFFFFFFF))) {
/* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */
- dev_out = ip_dev_find(net, oldflp->fl4_src);
+ dev_out = __ip_dev_find(net, oldflp->fl4_src, false);
if (dev_out == NULL)
goto out;
@@ -2560,26 +2561,21 @@ static int ip_route_output_slow(struct net *net, struct rtable **rp,
if (!(oldflp->flags & FLOWI_FLAG_ANYSRC)) {
/* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */
- dev_out = ip_dev_find(net, oldflp->fl4_src);
- if (dev_out == NULL)
+ if (!__ip_dev_find(net, oldflp->fl4_src, false))
goto out;
- dev_put(dev_out);
- dev_out = NULL;
}
}
if (oldflp->oif) {
- dev_out = dev_get_by_index(net, oldflp->oif);
+ dev_out = dev_get_by_index_rcu(net, oldflp->oif);
err = -ENODEV;
if (dev_out == NULL)
goto out;
/* RACE: Check return value of inet_select_addr instead. */
- if (rcu_dereference_raw(dev_out->ip_ptr) == NULL) {
- dev_put(dev_out);
+ if (rcu_dereference(dev_out->ip_ptr) == NULL)
goto out; /* Wrong error code */
- }
if (ipv4_is_local_multicast(oldflp->fl4_dst) ||
oldflp->fl4_dst == htonl(0xFFFFFFFF)) {
@@ -2602,10 +2598,7 @@ static int ip_route_output_slow(struct net *net, struct rtable **rp,
fl.fl4_dst = fl.fl4_src;
if (!fl.fl4_dst)
fl.fl4_dst = fl.fl4_src = htonl(INADDR_LOOPBACK);
- if (dev_out)
- dev_put(dev_out);
dev_out = net->loopback_dev;
- dev_hold(dev_out);
fl.oif = net->loopback_dev->ifindex;
res.type = RTN_LOCAL;
flags |= RTCF_LOCAL;
@@ -2639,8 +2632,6 @@ static int ip_route_output_slow(struct net *net, struct rtable **rp,
res.type = RTN_UNICAST;
goto make_route;
}
- if (dev_out)
- dev_put(dev_out);
err = -ENETUNREACH;
goto out;
}
@@ -2649,10 +2640,7 @@ static int ip_route_output_slow(struct net *net, struct rtable **rp,
if (res.type == RTN_LOCAL) {
if (!fl.fl4_src)
fl.fl4_src = fl.fl4_dst;
- if (dev_out)
- dev_put(dev_out);
dev_out = net->loopback_dev;
- dev_hold(dev_out);
fl.oif = dev_out->ifindex;
if (res.fi)
fib_info_put(res.fi);
@@ -2672,28 +2660,23 @@ static int ip_route_output_slow(struct net *net, struct rtable **rp,
if (!fl.fl4_src)
fl.fl4_src = FIB_RES_PREFSRC(res);
- if (dev_out)
- dev_put(dev_out);
dev_out = FIB_RES_DEV(res);
- dev_hold(dev_out);
fl.oif = dev_out->ifindex;
make_route:
err = ip_mkroute_output(rp, &res, &fl, oldflp, dev_out, flags);
-
if (free_res)
fib_res_put(&res);
- if (dev_out)
- dev_put(dev_out);
out: return err;
}
int __ip_route_output_key(struct net *net, struct rtable **rp,
const struct flowi *flp)
{
- unsigned hash;
+ unsigned int hash;
+ int res;
struct rtable *rth;
if (!rt_caching(net))
@@ -2724,7 +2707,10 @@ int __ip_route_output_key(struct net *net, struct rtable **rp,
rcu_read_unlock_bh();
slow_output:
- return ip_route_output_slow(net, rp, flp);
+ rcu_read_lock();
+ res = ip_route_output_slow(net, rp, flp);
+ rcu_read_unlock();
+ return res;
}
EXPORT_SYMBOL_GPL(__ip_route_output_key);