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authorEric Dumazet <edumazet@google.com>2015-09-29 07:42:52 -0700
committerDavid S. Miller <davem@davemloft.net>2015-09-29 16:53:10 -0700
commit0536fcc039a8926ec12ec587f41a83f7acafeb82 (patch)
tree335da15ef581d750ada2ba11e6ca6900ba82ae86 /net/ipv4/tcp.c
parent2985aaac010ebd5e562ce1a22cc61acbb0e40cf2 (diff)
downloadop-kernel-dev-0536fcc039a8926ec12ec587f41a83f7acafeb82.zip
op-kernel-dev-0536fcc039a8926ec12ec587f41a83f7acafeb82.tar.gz
tcp: prepare fastopen code for upcoming listener changes
While auditing TCP stack for upcoming 'lockless' listener changes, I found I had to change fastopen_init_queue() to properly init the object before publishing it. Otherwise an other cpu could try to lock the spinlock before it gets properly initialized. Instead of adding appropriate barriers, just remove dynamic memory allocations : - Structure is 28 bytes on 64bit arches. Using additional 8 bytes for holding a pointer seems overkill. - Two listeners can share same cache line and performance would suffer. If we really want to save few bytes, we would instead dynamically allocate whole struct request_sock_queue in the future. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp.c')
-rw-r--r--net/ipv4/tcp.c14
1 files changed, 2 insertions, 12 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index b8b8fa1..3c96fa8 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2253,13 +2253,6 @@ int tcp_disconnect(struct sock *sk, int flags)
}
EXPORT_SYMBOL(tcp_disconnect);
-void tcp_sock_destruct(struct sock *sk)
-{
- inet_sock_destruct(sk);
-
- kfree(inet_csk(sk)->icsk_accept_queue.fastopenq);
-}
-
static inline bool tcp_can_repair_sock(const struct sock *sk)
{
return ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN) &&
@@ -2581,7 +2574,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
TCPF_LISTEN))) {
tcp_fastopen_init_key_once(true);
- err = fastopen_init_queue(sk, val);
+ fastopen_queue_tune(sk, val);
} else {
err = -EINVAL;
}
@@ -2849,10 +2842,7 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
break;
case TCP_FASTOPEN:
- if (icsk->icsk_accept_queue.fastopenq)
- val = icsk->icsk_accept_queue.fastopenq->max_qlen;
- else
- val = 0;
+ val = icsk->icsk_accept_queue.fastopenq.max_qlen;
break;
case TCP_TIMESTAMP:
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