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fib: RCU conversion of fib_lookup()
fib_lookup() converted to be called in RCU protected context, no reference taken and released on a contended cache line (fib_clntref) fib_table_lookup() and fib_semantic_match() get an additional parameter. struct fib_info gets an rcu_head field, and is freed after an rcu grace period. Stress test : (Sending 160.000.000 UDP frames on same neighbour, IP route cache disabled, dual E5540 @2.53GHz, 32bit kernel, FIB_HASH) (about same results for FIB_TRIE) Before patch : real 1m31.199s user 0m13.761s sys 23m24.780s After patch: real 1m5.375s user 0m14.997s sys 15m50.115s Before patch Profile : 13044.00 15.4% __ip_route_output_key vmlinux 8438.00 10.0% dst_destroy vmlinux 5983.00 7.1% fib_semantic_match vmlinux 5410.00 6.4% fib_rules_lookup vmlinux 4803.00 5.7% neigh_lookup vmlinux 4420.00 5.2% _raw_spin_lock vmlinux 3883.00 4.6% rt_set_nexthop vmlinux 3261.00 3.9% _raw_read_lock vmlinux 2794.00 3.3% fib_table_lookup vmlinux 2374.00 2.8% neigh_resolve_output vmlinux 2153.00 2.5% dst_alloc vmlinux 1502.00 1.8% _raw_read_lock_bh vmlinux 1484.00 1.8% kmem_cache_alloc vmlinux 1407.00 1.7% eth_header vmlinux 1406.00 1.7% ipv4_dst_destroy vmlinux 1298.00 1.5% __copy_from_user_ll vmlinux 1174.00 1.4% dev_queue_xmit vmlinux 1000.00 1.2% ip_output vmlinux After patch Profile : 13712.00 15.8% dst_destroy vmlinux 8548.00 9.9% __ip_route_output_key vmlinux 7017.00 8.1% neigh_lookup vmlinux 4554.00 5.3% fib_semantic_match vmlinux 4067.00 4.7% _raw_read_lock vmlinux 3491.00 4.0% dst_alloc vmlinux 3186.00 3.7% neigh_resolve_output vmlinux 3103.00 3.6% fib_table_lookup vmlinux 2098.00 2.4% _raw_read_lock_bh vmlinux 2081.00 2.4% kmem_cache_alloc vmlinux 2013.00 2.3% _raw_spin_lock vmlinux 1763.00 2.0% __copy_from_user_ll vmlinux 1763.00 2.0% ip_output vmlinux 1761.00 2.0% ipv4_dst_destroy vmlinux 1631.00 1.9% eth_header vmlinux 1440.00 1.7% _raw_read_unlock_bh vmlinux Reference results, if IP route cache is enabled : real 0m29.718s user 0m10.845s sys 7m37.341s 25213.00 29.5% __ip_route_output_key vmlinux 9011.00 10.5% dst_release vmlinux 4817.00 5.6% ip_push_pending_frames vmlinux 4232.00 5.0% ip_finish_output vmlinux 3940.00 4.6% udp_sendmsg vmlinux 3730.00 4.4% __copy_from_user_ll vmlinux 3716.00 4.4% ip_route_output_flow vmlinux 2451.00 2.9% __xfrm_lookup vmlinux 2221.00 2.6% ip_append_data vmlinux 1718.00 2.0% _raw_spin_lock_bh vmlinux 1655.00 1.9% __alloc_skb vmlinux 1572.00 1.8% sock_wfree vmlinux 1345.00 1.6% kfree vmlinux Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
David S. Miller
parent
c2952c314b
commit
ebc0ffae5d
@ -31,6 +31,8 @@ struct fib_lookup_arg {
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void *lookup_ptr;
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void *result;
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struct fib_rule *rule;
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int flags;
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#define FIB_LOOKUP_NOREF 1
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};
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struct fib_rules_ops {
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@ -86,6 +86,7 @@ struct fib_info {
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#ifdef CONFIG_IP_ROUTE_MULTIPATH
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int fib_power;
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#endif
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struct rcu_head rcu;
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struct fib_nh fib_nh[0];
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#define fib_dev fib_nh[0].nh_dev
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};
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@ -148,7 +149,7 @@ struct fib_table {
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};
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extern int fib_table_lookup(struct fib_table *tb, const struct flowi *flp,
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struct fib_result *res);
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struct fib_result *res, int fib_flags);
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extern int fib_table_insert(struct fib_table *, struct fib_config *);
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extern int fib_table_delete(struct fib_table *, struct fib_config *);
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extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
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@ -185,11 +186,11 @@ static inline int fib_lookup(struct net *net, const struct flowi *flp,
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struct fib_table *table;
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table = fib_get_table(net, RT_TABLE_LOCAL);
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if (!fib_table_lookup(table, flp, res))
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if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
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return 0;
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table = fib_get_table(net, RT_TABLE_MAIN);
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if (!fib_table_lookup(table, flp, res))
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if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
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return 0;
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return -ENETUNREACH;
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}
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@ -254,16 +255,6 @@ static inline void fib_info_put(struct fib_info *fi)
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free_fib_info(fi);
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}
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static inline void fib_res_put(struct fib_result *res)
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{
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if (res->fi)
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fib_info_put(res->fi);
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#ifdef CONFIG_IP_MULTIPLE_TABLES
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if (res->r)
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fib_rule_put(res->r);
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#endif
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}
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#ifdef CONFIG_PROC_FS
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extern int __net_init fib_proc_init(struct net *net);
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extern void __net_exit fib_proc_exit(struct net *net);
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@ -225,7 +225,8 @@ jumped:
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err = ops->action(rule, fl, flags, arg);
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if (err != -EAGAIN) {
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if (likely(atomic_inc_not_zero(&rule->refcnt))) {
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if ((arg->flags & FIB_LOOKUP_NOREF) ||
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likely(atomic_inc_not_zero(&rule->refcnt))) {
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arg->rule = rule;
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goto out;
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}
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@ -168,8 +168,11 @@ struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
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struct fib_result res = { 0 };
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struct net_device *dev = NULL;
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if (fib_lookup(net, &fl, &res))
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rcu_read_lock();
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if (fib_lookup(net, &fl, &res)) {
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rcu_read_unlock();
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return NULL;
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}
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if (res.type != RTN_LOCAL)
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goto out;
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dev = FIB_RES_DEV(res);
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@ -177,7 +180,7 @@ struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
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if (dev && devref)
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dev_hold(dev);
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out:
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fib_res_put(&res);
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rcu_read_unlock();
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return dev;
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}
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EXPORT_SYMBOL(__ip_dev_find);
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@ -207,11 +210,12 @@ static inline unsigned __inet_dev_addr_type(struct net *net,
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local_table = fib_get_table(net, RT_TABLE_LOCAL);
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if (local_table) {
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ret = RTN_UNICAST;
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if (!fib_table_lookup(local_table, &fl, &res)) {
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rcu_read_lock();
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if (!fib_table_lookup(local_table, &fl, &res, FIB_LOOKUP_NOREF)) {
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if (!dev || dev == res.fi->fib_dev)
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ret = res.type;
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fib_res_put(&res);
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}
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rcu_read_unlock();
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}
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return ret;
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}
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@ -235,6 +239,7 @@ EXPORT_SYMBOL(inet_dev_addr_type);
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* - figure out what "logical" interface this packet arrived
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* and calculate "specific destination" address.
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* - check, that packet arrived from expected physical interface.
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* called with rcu_read_lock()
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*/
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int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
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struct net_device *dev, __be32 *spec_dst,
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@ -259,7 +264,6 @@ int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
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struct net *net;
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no_addr = rpf = accept_local = 0;
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rcu_read_lock();
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in_dev = __in_dev_get_rcu(dev);
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if (in_dev) {
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no_addr = in_dev->ifa_list == NULL;
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@ -268,7 +272,6 @@ int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
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if (mark && !IN_DEV_SRC_VMARK(in_dev))
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fl.mark = 0;
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}
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rcu_read_unlock();
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if (in_dev == NULL)
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goto e_inval;
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@ -278,7 +281,7 @@ int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
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goto last_resort;
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if (res.type != RTN_UNICAST) {
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if (res.type != RTN_LOCAL || !accept_local)
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goto e_inval_res;
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goto e_inval;
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}
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*spec_dst = FIB_RES_PREFSRC(res);
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fib_combine_itag(itag, &res);
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@ -299,10 +302,8 @@ int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
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#endif
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if (dev_match) {
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ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
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fib_res_put(&res);
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return ret;
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}
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fib_res_put(&res);
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if (no_addr)
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goto last_resort;
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if (rpf == 1)
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@ -315,7 +316,6 @@ int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
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*spec_dst = FIB_RES_PREFSRC(res);
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ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
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}
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fib_res_put(&res);
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}
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return ret;
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@ -326,8 +326,6 @@ last_resort:
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*itag = 0;
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return 0;
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e_inval_res:
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fib_res_put(&res);
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e_inval:
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return -EINVAL;
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e_rpf:
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@ -873,15 +871,16 @@ static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb)
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local_bh_disable();
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frn->tb_id = tb->tb_id;
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frn->err = fib_table_lookup(tb, &fl, &res);
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rcu_read_lock();
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frn->err = fib_table_lookup(tb, &fl, &res, FIB_LOOKUP_NOREF);
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if (!frn->err) {
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frn->prefixlen = res.prefixlen;
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frn->nh_sel = res.nh_sel;
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frn->type = res.type;
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frn->scope = res.scope;
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fib_res_put(&res);
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}
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rcu_read_unlock();
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local_bh_enable();
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}
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}
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@ -244,7 +244,8 @@ fn_new_zone(struct fn_hash *table, int z)
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}
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int fib_table_lookup(struct fib_table *tb,
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const struct flowi *flp, struct fib_result *res)
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const struct flowi *flp, struct fib_result *res,
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int fib_flags)
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{
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int err;
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struct fn_zone *fz;
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@ -264,7 +265,7 @@ int fib_table_lookup(struct fib_table *tb,
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err = fib_semantic_match(&f->fn_alias,
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flp, res,
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fz->fz_order);
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fz->fz_order, fib_flags);
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if (err <= 0)
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goto out;
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}
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@ -22,7 +22,7 @@ struct fib_alias {
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/* Exported by fib_semantics.c */
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extern int fib_semantic_match(struct list_head *head,
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const struct flowi *flp,
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struct fib_result *res, int prefixlen);
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struct fib_result *res, int prefixlen, int fib_flags);
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extern void fib_release_info(struct fib_info *);
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extern struct fib_info *fib_create_info(struct fib_config *cfg);
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extern int fib_nh_match(struct fib_config *cfg, struct fib_info *fi);
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@ -57,6 +57,7 @@ int fib_lookup(struct net *net, struct flowi *flp, struct fib_result *res)
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{
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struct fib_lookup_arg arg = {
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.result = res,
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.flags = FIB_LOOKUP_NOREF,
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};
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int err;
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@ -94,7 +95,7 @@ static int fib4_rule_action(struct fib_rule *rule, struct flowi *flp,
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if (!tbl)
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goto errout;
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err = fib_table_lookup(tbl, flp, (struct fib_result *) arg->result);
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err = fib_table_lookup(tbl, flp, (struct fib_result *) arg->result, arg->flags);
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if (err > 0)
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err = -EAGAIN;
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errout:
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@ -148,6 +148,13 @@ static const struct
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/* Release a nexthop info record */
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static void free_fib_info_rcu(struct rcu_head *head)
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{
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struct fib_info *fi = container_of(head, struct fib_info, rcu);
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kfree(fi);
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}
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void free_fib_info(struct fib_info *fi)
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{
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if (fi->fib_dead == 0) {
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@ -161,7 +168,7 @@ void free_fib_info(struct fib_info *fi)
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} endfor_nexthops(fi);
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fib_info_cnt--;
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release_net(fi->fib_net);
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kfree(fi);
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call_rcu(&fi->rcu, free_fib_info_rcu);
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}
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void fib_release_info(struct fib_info *fi)
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@ -553,6 +560,7 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
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nh->nh_scope = RT_SCOPE_LINK;
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return 0;
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}
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rcu_read_lock();
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{
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struct flowi fl = {
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.nl_u = {
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@ -568,8 +576,10 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
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if (fl.fl4_scope < RT_SCOPE_LINK)
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fl.fl4_scope = RT_SCOPE_LINK;
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err = fib_lookup(net, &fl, &res);
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if (err)
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if (err) {
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rcu_read_unlock();
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return err;
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}
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}
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err = -EINVAL;
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if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
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@ -585,7 +595,7 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
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goto out;
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err = 0;
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out:
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fib_res_put(&res);
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rcu_read_unlock();
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return err;
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} else {
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struct in_device *in_dev;
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@ -879,7 +889,7 @@ failure:
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/* Note! fib_semantic_match intentionally uses RCU list functions. */
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int fib_semantic_match(struct list_head *head, const struct flowi *flp,
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struct fib_result *res, int prefixlen)
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struct fib_result *res, int prefixlen, int fib_flags)
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{
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struct fib_alias *fa;
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int nh_sel = 0;
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@ -943,7 +953,8 @@ out_fill_res:
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res->type = fa->fa_type;
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res->scope = fa->fa_scope;
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res->fi = fa->fa_info;
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atomic_inc(&res->fi->fib_clntref);
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if (!(fib_flags & FIB_LOOKUP_NOREF))
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atomic_inc(&res->fi->fib_clntref);
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return 0;
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}
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@ -1342,7 +1342,7 @@ err:
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/* should be called with rcu_read_lock */
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static int check_leaf(struct trie *t, struct leaf *l,
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t_key key, const struct flowi *flp,
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struct fib_result *res)
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struct fib_result *res, int fib_flags)
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{
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struct leaf_info *li;
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struct hlist_head *hhead = &l->list;
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@ -1356,7 +1356,7 @@ static int check_leaf(struct trie *t, struct leaf *l,
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if (l->key != (key & ntohl(mask)))
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continue;
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err = fib_semantic_match(&li->falh, flp, res, plen);
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err = fib_semantic_match(&li->falh, flp, res, plen, fib_flags);
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#ifdef CONFIG_IP_FIB_TRIE_STATS
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if (err <= 0)
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@ -1372,7 +1372,7 @@ static int check_leaf(struct trie *t, struct leaf *l,
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}
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int fib_table_lookup(struct fib_table *tb, const struct flowi *flp,
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struct fib_result *res)
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struct fib_result *res, int fib_flags)
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{
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struct trie *t = (struct trie *) tb->tb_data;
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int ret;
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@ -1399,7 +1399,7 @@ int fib_table_lookup(struct fib_table *tb, const struct flowi *flp,
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/* Just a leaf? */
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if (IS_LEAF(n)) {
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ret = check_leaf(t, (struct leaf *)n, key, flp, res);
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ret = check_leaf(t, (struct leaf *)n, key, flp, res, fib_flags);
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goto found;
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}
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@ -1424,7 +1424,7 @@ int fib_table_lookup(struct fib_table *tb, const struct flowi *flp,
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}
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if (IS_LEAF(n)) {
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ret = check_leaf(t, (struct leaf *)n, key, flp, res);
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ret = check_leaf(t, (struct leaf *)n, key, flp, res, fib_flags);
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if (ret > 0)
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goto backtrace;
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goto found;
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@ -1773,12 +1773,15 @@ void ip_rt_get_source(u8 *addr, struct rtable *rt)
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if (rt->fl.iif == 0)
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src = rt->rt_src;
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else if (fib_lookup(dev_net(rt->dst.dev), &rt->fl, &res) == 0) {
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src = FIB_RES_PREFSRC(res);
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fib_res_put(&res);
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} else
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src = inet_select_addr(rt->dst.dev, rt->rt_gateway,
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else {
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rcu_read_lock();
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if (fib_lookup(dev_net(rt->dst.dev), &rt->fl, &res) == 0)
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src = FIB_RES_PREFSRC(res);
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else
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src = inet_select_addr(rt->dst.dev, rt->rt_gateway,
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RT_SCOPE_UNIVERSE);
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rcu_read_unlock();
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}
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memcpy(addr, &src, 4);
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}
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@ -2081,6 +2084,7 @@ static int ip_mkroute_input(struct sk_buff *skb,
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* Such approach solves two big problems:
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* 1. Not simplex devices are handled properly.
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* 2. IP spoofing attempts are filtered with 100% of guarantee.
|
||||
* called with rcu_read_lock()
|
||||
*/
|
||||
|
||||
static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
|
||||
@ -2102,7 +2106,6 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
|
||||
unsigned hash;
|
||||
__be32 spec_dst;
|
||||
int err = -EINVAL;
|
||||
int free_res = 0;
|
||||
struct net * net = dev_net(dev);
|
||||
|
||||
/* IP on this device is disabled. */
|
||||
@ -2134,12 +2137,12 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
|
||||
/*
|
||||
* Now we are ready to route packet.
|
||||
*/
|
||||
if ((err = fib_lookup(net, &fl, &res)) != 0) {
|
||||
err = fib_lookup(net, &fl, &res);
|
||||
if (err != 0) {
|
||||
if (!IN_DEV_FORWARD(in_dev))
|
||||
goto e_hostunreach;
|
||||
goto no_route;
|
||||
}
|
||||
free_res = 1;
|
||||
|
||||
RT_CACHE_STAT_INC(in_slow_tot);
|
||||
|
||||
@ -2148,8 +2151,8 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
|
||||
|
||||
if (res.type == RTN_LOCAL) {
|
||||
err = fib_validate_source(saddr, daddr, tos,
|
||||
net->loopback_dev->ifindex,
|
||||
dev, &spec_dst, &itag, skb->mark);
|
||||
net->loopback_dev->ifindex,
|
||||
dev, &spec_dst, &itag, skb->mark);
|
||||
if (err < 0)
|
||||
goto martian_source_keep_err;
|
||||
if (err)
|
||||
@ -2164,9 +2167,6 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
|
||||
goto martian_destination;
|
||||
|
||||
err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos);
|
||||
done:
|
||||
if (free_res)
|
||||
fib_res_put(&res);
|
||||
out: return err;
|
||||
|
||||
brd_input:
|
||||
@ -2226,7 +2226,7 @@ local_input:
|
||||
rth->rt_type = res.type;
|
||||
hash = rt_hash(daddr, saddr, fl.iif, rt_genid(net));
|
||||
err = rt_intern_hash(hash, rth, NULL, skb, fl.iif);
|
||||
goto done;
|
||||
goto out;
|
||||
|
||||
no_route:
|
||||
RT_CACHE_STAT_INC(in_no_route);
|
||||
@ -2249,21 +2249,21 @@ martian_destination:
|
||||
|
||||
e_hostunreach:
|
||||
err = -EHOSTUNREACH;
|
||||
goto done;
|
||||
goto out;
|
||||
|
||||
e_inval:
|
||||
err = -EINVAL;
|
||||
goto done;
|
||||
goto out;
|
||||
|
||||
e_nobufs:
|
||||
err = -ENOBUFS;
|
||||
goto done;
|
||||
goto out;
|
||||
|
||||
martian_source:
|
||||
err = -EINVAL;
|
||||
martian_source_keep_err:
|
||||
ip_handle_martian_source(dev, in_dev, skb, daddr, saddr);
|
||||
goto done;
|
||||
goto out;
|
||||
}
|
||||
|
||||
int ip_route_input_common(struct sk_buff *skb, __be32 daddr, __be32 saddr,
|
||||
@ -2349,6 +2349,7 @@ skip_cache:
|
||||
}
|
||||
EXPORT_SYMBOL(ip_route_input_common);
|
||||
|
||||
/* called with rcu_read_lock() */
|
||||
static int __mkroute_output(struct rtable **result,
|
||||
struct fib_result *res,
|
||||
const struct flowi *fl,
|
||||
@ -2373,18 +2374,13 @@ static int __mkroute_output(struct rtable **result,
|
||||
if (dev_out->flags & IFF_LOOPBACK)
|
||||
flags |= RTCF_LOCAL;
|
||||
|
||||
rcu_read_lock();
|
||||
in_dev = __in_dev_get_rcu(dev_out);
|
||||
if (!in_dev) {
|
||||
rcu_read_unlock();
|
||||
if (!in_dev)
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (res->type == RTN_BROADCAST) {
|
||||
flags |= RTCF_BROADCAST | RTCF_LOCAL;
|
||||
if (res->fi) {
|
||||
fib_info_put(res->fi);
|
||||
res->fi = NULL;
|
||||
}
|
||||
res->fi = NULL;
|
||||
} else if (res->type == RTN_MULTICAST) {
|
||||
flags |= RTCF_MULTICAST | RTCF_LOCAL;
|
||||
if (!ip_check_mc(in_dev, oldflp->fl4_dst, oldflp->fl4_src,
|
||||
@ -2394,10 +2390,8 @@ static int __mkroute_output(struct rtable **result,
|
||||
* default one, but do not gateway in this case.
|
||||
* Yes, it is hack.
|
||||
*/
|
||||
if (res->fi && res->prefixlen < 4) {
|
||||
fib_info_put(res->fi);
|
||||
if (res->fi && res->prefixlen < 4)
|
||||
res->fi = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
@ -2467,6 +2461,7 @@ static int __mkroute_output(struct rtable **result,
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* called with rcu_read_lock() */
|
||||
static int ip_mkroute_output(struct rtable **rp,
|
||||
struct fib_result *res,
|
||||
const struct flowi *fl,
|
||||
@ -2509,7 +2504,6 @@ static int ip_route_output_slow(struct net *net, struct rtable **rp,
|
||||
struct fib_result res;
|
||||
unsigned int flags = 0;
|
||||
struct net_device *dev_out = NULL;
|
||||
int free_res = 0;
|
||||
int err;
|
||||
|
||||
|
||||
@ -2636,15 +2630,12 @@ static int ip_route_output_slow(struct net *net, struct rtable **rp,
|
||||
err = -ENETUNREACH;
|
||||
goto out;
|
||||
}
|
||||
free_res = 1;
|
||||
|
||||
if (res.type == RTN_LOCAL) {
|
||||
if (!fl.fl4_src)
|
||||
fl.fl4_src = fl.fl4_dst;
|
||||
dev_out = net->loopback_dev;
|
||||
fl.oif = dev_out->ifindex;
|
||||
if (res.fi)
|
||||
fib_info_put(res.fi);
|
||||
res.fi = NULL;
|
||||
flags |= RTCF_LOCAL;
|
||||
goto make_route;
|
||||
@ -2668,8 +2659,6 @@ static int ip_route_output_slow(struct net *net, struct rtable **rp,
|
||||
make_route:
|
||||
err = ip_mkroute_output(rp, &res, &fl, oldflp, dev_out, flags);
|
||||
|
||||
if (free_res)
|
||||
fib_res_put(&res);
|
||||
out: return err;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user