In inet_csk_get_port we seem to be using smallest_port to figure out where the
best place to look for a SO_REUSEPORT sk that matches with an existing set of
SO_REUSEPORT's. However if we get to the logic
if (smallest_size != -1) {
port = smallest_port;
goto have_port;
}
we will do a useless search, because we would have already done the
inet_csk_bind_conflict for that port and it would have returned 1, otherwise we
would have gone to found_tb and succeeded. Since this logic makes us do yet
another trip through inet_csk_bind_conflict for a port we know won't work just
delete this code and save us the time.
Signed-off-by: Josef Bacik <jba...@fb.com>
---
net/ipv4/inet_connection_sock.c | 26 ++++----------------------
1 file changed, 4 insertions(+), 22 deletions(-)
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 74f6a57..1a1a94bd 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -93,7 +93,6 @@ int inet_csk_get_port(struct sock *sk, unsigned short snum)
bool reuse = sk->sk_reuse && sk->sk_state != TCP_LISTEN;
struct inet_hashinfo *hinfo = sk->sk_prot->h.hashinfo;
int ret = 1, attempts = 5, port = snum;
- int smallest_size = -1, smallest_port;
struct inet_bind_hashbucket *head;
struct net *net = sock_net(sk);
int i, low, high, attempt_half;
@@ -103,7 +102,6 @@ int inet_csk_get_port(struct sock *sk, unsigned short snum)
bool reuseport_ok = !!snum;
if (port) {
-have_port:
head = &hinfo->bhash[inet_bhashfn(net, port,
hinfo->bhash_size)];
spin_lock_bh(&head->lock);
@@ -137,8 +135,6 @@ other_half_scan:
* We do the opposite to not pollute connect() users.
*/
offset |= 1U;
- smallest_size = -1;
- smallest_port = low; /* avoid compiler warning */
other_parity_scan:
port = low + offset;
@@ -152,15 +148,6 @@ other_parity_scan:
spin_lock_bh(&head->lock);
inet_bind_bucket_for_each(tb, &head->chain)
if (net_eq(ib_net(tb), net) && tb->port == port) {
- if (((tb->fastreuse > 0 && reuse) ||
- (tb->fastreuseport > 0 &&
- sk->sk_reuseport &&
- !rcu_access_pointer(sk->sk_reuseport_cb)
&&
- uid_eq(tb->fastuid, uid))) &&
- (tb->num_owners < smallest_size ||
smallest_size == -1)) {
- smallest_size = tb->num_owners;
- smallest_port = port;
- }
if (!inet_csk_bind_conflict(sk, tb, false,
reuseport_ok))
goto tb_found;
goto next_port;
@@ -171,10 +158,6 @@ next_port:
cond_resched();
}
- if (smallest_size != -1) {
- port = smallest_port;
- goto have_port;
- }
offset--;
if (!(offset & 1))
goto other_parity_scan;
@@ -196,19 +179,18 @@ tb_found:
if (sk->sk_reuse == SK_FORCE_REUSE)
goto success;
- if (((tb->fastreuse > 0 && reuse) ||
+ if ((tb->fastreuse > 0 && reuse) ||
(tb->fastreuseport > 0 &&
!rcu_access_pointer(sk->sk_reuseport_cb) &&
- sk->sk_reuseport && uid_eq(tb->fastuid, uid))) &&
- smallest_size == -1)
+ sk->sk_reuseport && uid_eq(tb->fastuid, uid)))
goto success;
if (inet_csk_bind_conflict(sk, tb, true, reuseport_ok)) {
if ((reuse ||
(tb->fastreuseport > 0 &&
sk->sk_reuseport &&
!rcu_access_pointer(sk->sk_reuseport_cb) &&
- uid_eq(tb->fastuid, uid))) &&
- !snum && smallest_size != -1 && --attempts >= 0) {
+ uid_eq(tb->fastuid, uid))) && !snum &&
+ --attempts >= 0) {
spin_unlock_bh(&head->lock);
goto again;
}
--
2.9.3
