Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753248AbaJTTyC (ORCPT ); Mon, 20 Oct 2014 15:54:02 -0400 Received: from casper.infradead.org ([85.118.1.10]:47209 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751524AbaJTTyA (ORCPT ); Mon, 20 Oct 2014 15:54:00 -0400 Date: Mon, 20 Oct 2014 20:53:55 +0100 From: Thomas Graf To: Heiko Carstens Cc: Eric Dumazet , Sasha Levin , paulmck@linux.vnet.ibm.com, Nikolay Aleksandrov , "David S. Miller" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Ursula Braun Subject: [PATCH] netlink: Re-add locking to netlink_lookup() and seq walker Message-ID: <20141020195355.GA2299@casper.infradead.org> References: <20141011083627.GB5074@osiris> <1413055964.9362.50.camel@edumazet-glaptop2.roam.corp.google.com> <20141011222514.GA14186@casper.infradead.org> <20141020082107.GB4268@osiris> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20141020082107.GB4268@osiris> User-Agent: Mutt/1.5.23 (2014-03-12) X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Heiko, Can you test the following patch: The synchronize_rcu() in netlink_release() introduces unacceptable latency. Reintroduce minimal lookup so we can drop the synchronize_rcu() until socket destruction has been RCUfied. Signed-off-by: Thomas Graf --- net/netlink/af_netlink.c | 37 +++++++++++++++++++++++++------------ 1 file changed, 25 insertions(+), 12 deletions(-) diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index 7a186e7..f1de72d 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -96,6 +96,14 @@ static DECLARE_WAIT_QUEUE_HEAD(nl_table_wait); static int netlink_dump(struct sock *sk); static void netlink_skb_destructor(struct sk_buff *skb); +/* nl_table locking explained: + * Lookup and traversal are protected with nl_sk_hash_lock or nl_table_lock + * combined with an RCU read-side lock. Insertion and removal are protected + * with nl_sk_hash_lock while using RCU list modification primitives and may + * run in parallel to nl_table_lock protected lookups. Destruction of the + * Netlink socket may only occur *after* nl_table_lock has been acquired + * either during or after the socket has been removed from the list. + */ DEFINE_RWLOCK(nl_table_lock); EXPORT_SYMBOL_GPL(nl_table_lock); static atomic_t nl_table_users = ATOMIC_INIT(0); @@ -109,10 +117,10 @@ EXPORT_SYMBOL_GPL(nl_sk_hash_lock); static int lockdep_nl_sk_hash_is_held(void) { #ifdef CONFIG_LOCKDEP - return (debug_locks) ? lockdep_is_held(&nl_sk_hash_lock) : 1; -#else - return 1; + if (debug_locks) + return lockdep_is_held(&nl_sk_hash_lock) || lockdep_is_held(&nl_table_lock); #endif + return 1; } static ATOMIC_NOTIFIER_HEAD(netlink_chain); @@ -1028,11 +1036,13 @@ static struct sock *netlink_lookup(struct net *net, int protocol, u32 portid) struct netlink_table *table = &nl_table[protocol]; struct sock *sk; + read_lock(&nl_table_lock); rcu_read_lock(); sk = __netlink_lookup(table, portid, net); if (sk) sock_hold(sk); rcu_read_unlock(); + read_unlock(&nl_table_lock); return sk; } @@ -1257,9 +1267,6 @@ static int netlink_release(struct socket *sock) } netlink_table_ungrab(); - /* Wait for readers to complete */ - synchronize_net(); - kfree(nlk->groups); nlk->groups = NULL; @@ -1281,6 +1288,7 @@ static int netlink_autobind(struct socket *sock) retry: cond_resched(); + netlink_table_grab(); rcu_read_lock(); if (__netlink_lookup(table, portid, net)) { /* Bind collision, search negative portid values. */ @@ -1288,9 +1296,11 @@ retry: if (rover > -4097) rover = -4097; rcu_read_unlock(); + netlink_table_ungrab(); goto retry; } rcu_read_unlock(); + netlink_table_ungrab(); err = netlink_insert(sk, net, portid); if (err == -EADDRINUSE) @@ -2921,14 +2931,16 @@ static struct sock *netlink_seq_socket_idx(struct seq_file *seq, loff_t pos) } static void *netlink_seq_start(struct seq_file *seq, loff_t *pos) - __acquires(RCU) + __acquires(nl_table_lock) __acquires(RCU) { + read_lock(&nl_table_lock); rcu_read_lock(); return *pos ? netlink_seq_socket_idx(seq, *pos - 1) : SEQ_START_TOKEN; } static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos) { + struct rhashtable *ht; struct netlink_sock *nlk; struct nl_seq_iter *iter; struct net *net; @@ -2943,19 +2955,19 @@ static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos) iter = seq->private; nlk = v; - rht_for_each_entry_rcu(nlk, nlk->node.next, node) + i = iter->link; + ht = &nl_table[i].hash; + rht_for_each_entry(nlk, nlk->node.next, ht, node) if (net_eq(sock_net((struct sock *)nlk), net)) return nlk; - i = iter->link; j = iter->hash_idx + 1; do { - struct rhashtable *ht = &nl_table[i].hash; const struct bucket_table *tbl = rht_dereference_rcu(ht->tbl, ht); for (; j < tbl->size; j++) { - rht_for_each_entry_rcu(nlk, tbl->buckets[j], node) { + rht_for_each_entry(nlk, tbl->buckets[j], ht, node) { if (net_eq(sock_net((struct sock *)nlk), net)) { iter->link = i; iter->hash_idx = j; @@ -2971,9 +2983,10 @@ static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos) } static void netlink_seq_stop(struct seq_file *seq, void *v) - __releases(RCU) + __releases(RCU) __releases(nl_table_lock) { rcu_read_unlock(); + read_unlock(&nl_table_lock); } -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/