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authorEric Dumazet <edumazet@google.com>2016-12-03 11:14:57 -0800
committerDavid S. Miller <davem@davemloft.net>2016-12-05 13:32:24 -0500
commit7aa5470c2c09265902b5e4289afa82e4e7c2987e (patch)
treeacd4d2976939d6de5f4495bbebc4a9420e40d38e /net/ipv4
parent9115e8cd2a0c6eaaa900c462721f12e1d45f326c (diff)
downloadop-kernel-dev-7aa5470c2c09265902b5e4289afa82e4e7c2987e.zip
op-kernel-dev-7aa5470c2c09265902b5e4289afa82e4e7c2987e.tar.gz
tcp: tsq: move tsq_flags close to sk_wmem_alloc
tsq_flags being in the same cache line than sk_wmem_alloc makes a lot of sense. Both fields are changed from tcp_wfree() and more generally by various TSQ related functions. Prior patch made room in struct sock and added sk_tsq_flags, this patch deletes tsq_flags from struct tcp_sock. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/tcp.c4
-rw-r--r--net/ipv4/tcp_ipv4.c2
-rw-r--r--net/ipv4/tcp_output.c24
-rw-r--r--net/ipv4/tcp_timer.c4
4 files changed, 16 insertions, 18 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 1149b48..1ef3165 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -663,9 +663,9 @@ static void tcp_push(struct sock *sk, int flags, int mss_now,
if (tcp_should_autocork(sk, skb, size_goal)) {
/* avoid atomic op if TSQ_THROTTLED bit is already set */
- if (!test_bit(TSQ_THROTTLED, &tp->tsq_flags)) {
+ if (!test_bit(TSQ_THROTTLED, &sk->sk_tsq_flags)) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAUTOCORKING);
- set_bit(TSQ_THROTTLED, &tp->tsq_flags);
+ set_bit(TSQ_THROTTLED, &sk->sk_tsq_flags);
}
/* It is possible TX completion already happened
* before we set TSQ_THROTTLED.
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index b50f059..30d81f5 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -443,7 +443,7 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
if (!sock_owned_by_user(sk)) {
tcp_v4_mtu_reduced(sk);
} else {
- if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, &tp->tsq_flags))
+ if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, &sk->sk_tsq_flags))
sock_hold(sk);
}
goto out;
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 5f04bee..b45101f 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -767,14 +767,15 @@ static void tcp_tasklet_func(unsigned long data)
list_for_each_safe(q, n, &list) {
tp = list_entry(q, struct tcp_sock, tsq_node);
list_del(&tp->tsq_node);
- clear_bit(TSQ_QUEUED, &tp->tsq_flags);
sk = (struct sock *)tp;
+ clear_bit(TSQ_QUEUED, &sk->sk_tsq_flags);
+
if (!sk->sk_lock.owned &&
- test_bit(TCP_TSQ_DEFERRED, &tp->tsq_flags)) {
+ test_bit(TCP_TSQ_DEFERRED, &sk->sk_tsq_flags)) {
bh_lock_sock(sk);
if (!sock_owned_by_user(sk)) {
- clear_bit(TCP_TSQ_DEFERRED, &tp->tsq_flags);
+ clear_bit(TCP_TSQ_DEFERRED, &sk->sk_tsq_flags);
tcp_tsq_handler(sk);
}
bh_unlock_sock(sk);
@@ -797,16 +798,15 @@ static void tcp_tasklet_func(unsigned long data)
*/
void tcp_release_cb(struct sock *sk)
{
- struct tcp_sock *tp = tcp_sk(sk);
unsigned long flags, nflags;
/* perform an atomic operation only if at least one flag is set */
do {
- flags = tp->tsq_flags;
+ flags = sk->sk_tsq_flags;
if (!(flags & TCP_DEFERRED_ALL))
return;
nflags = flags & ~TCP_DEFERRED_ALL;
- } while (cmpxchg(&tp->tsq_flags, flags, nflags) != flags);
+ } while (cmpxchg(&sk->sk_tsq_flags, flags, nflags) != flags);
if (flags & TCPF_TSQ_DEFERRED)
tcp_tsq_handler(sk);
@@ -878,7 +878,7 @@ void tcp_wfree(struct sk_buff *skb)
if (wmem >= SKB_TRUESIZE(1) && this_cpu_ksoftirqd() == current)
goto out;
- for (oval = READ_ONCE(tp->tsq_flags);; oval = nval) {
+ for (oval = READ_ONCE(sk->sk_tsq_flags);; oval = nval) {
struct tsq_tasklet *tsq;
bool empty;
@@ -886,7 +886,7 @@ void tcp_wfree(struct sk_buff *skb)
goto out;
nval = (oval & ~TSQF_THROTTLED) | TSQF_QUEUED | TCPF_TSQ_DEFERRED;
- nval = cmpxchg(&tp->tsq_flags, oval, nval);
+ nval = cmpxchg(&sk->sk_tsq_flags, oval, nval);
if (nval != oval)
continue;
@@ -2100,7 +2100,7 @@ static bool tcp_small_queue_check(struct sock *sk, const struct sk_buff *skb,
skb->prev == sk->sk_write_queue.next)
return false;
- set_bit(TSQ_THROTTLED, &tcp_sk(sk)->tsq_flags);
+ set_bit(TSQ_THROTTLED, &sk->sk_tsq_flags);
/* It is possible TX completion already happened
* before we set TSQ_THROTTLED, so we must
* test again the condition.
@@ -2241,8 +2241,8 @@ static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
unlikely(tso_fragment(sk, skb, limit, mss_now, gfp)))
break;
- if (test_bit(TCP_TSQ_DEFERRED, &tp->tsq_flags))
- clear_bit(TCP_TSQ_DEFERRED, &tp->tsq_flags);
+ if (test_bit(TCP_TSQ_DEFERRED, &sk->sk_tsq_flags))
+ clear_bit(TCP_TSQ_DEFERRED, &sk->sk_tsq_flags);
if (tcp_small_queue_check(sk, skb, 0))
break;
@@ -3545,8 +3545,6 @@ void tcp_send_ack(struct sock *sk)
/* We do not want pure acks influencing TCP Small Queues or fq/pacing
* too much.
* SKB_TRUESIZE(max(1 .. 66, MAX_TCP_HEADER)) is unfortunately ~784
- * We also avoid tcp_wfree() overhead (cache line miss accessing
- * tp->tsq_flags) by using regular sock_wfree()
*/
skb_set_tcp_pure_ack(buff);
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index 3ea1cf8..3705075 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -310,7 +310,7 @@ static void tcp_delack_timer(unsigned long data)
inet_csk(sk)->icsk_ack.blocked = 1;
__NET_INC_STATS(sock_net(sk), LINUX_MIB_DELAYEDACKLOCKED);
/* deleguate our work to tcp_release_cb() */
- if (!test_and_set_bit(TCP_DELACK_TIMER_DEFERRED, &tcp_sk(sk)->tsq_flags))
+ if (!test_and_set_bit(TCP_DELACK_TIMER_DEFERRED, &sk->sk_tsq_flags))
sock_hold(sk);
}
bh_unlock_sock(sk);
@@ -592,7 +592,7 @@ static void tcp_write_timer(unsigned long data)
tcp_write_timer_handler(sk);
} else {
/* delegate our work to tcp_release_cb() */
- if (!test_and_set_bit(TCP_WRITE_TIMER_DEFERRED, &tcp_sk(sk)->tsq_flags))
+ if (!test_and_set_bit(TCP_WRITE_TIMER_DEFERRED, &sk->sk_tsq_flags))
sock_hold(sk);
}
bh_unlock_sock(sk);
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