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176 lines
6.1 KiB
176 lines
6.1 KiB
From 7aa5470c2c09265902b5e4289afa82e4e7c2987e Mon Sep 17 00:00:00 2001
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From: Eric Dumazet <edumazet@google.com>
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Date: Sat, 3 Dec 2016 11:14:57 -0800
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Subject: [PATCH 08/10] tcp: tsq: move tsq_flags close to sk_wmem_alloc
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tsq_flags being in the same cache line than sk_wmem_alloc
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makes a lot of sense. Both fields are changed from tcp_wfree()
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and more generally by various TSQ related functions.
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Prior patch made room in struct sock and added sk_tsq_flags,
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this patch deletes tsq_flags from struct tcp_sock.
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Signed-off-by: Eric Dumazet <edumazet@google.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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include/linux/tcp.h | 1 -
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net/ipv4/tcp.c | 4 ++--
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net/ipv4/tcp_ipv4.c | 2 +-
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net/ipv4/tcp_output.c | 24 +++++++++++-------------
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net/ipv4/tcp_timer.c | 4 ++--
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net/ipv6/tcp_ipv6.c | 2 +-
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6 files changed, 17 insertions(+), 20 deletions(-)
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--- a/include/linux/tcp.h
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+++ b/include/linux/tcp.h
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@@ -192,7 +192,6 @@ struct tcp_sock {
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u32 tsoffset; /* timestamp offset */
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struct list_head tsq_node; /* anchor in tsq_tasklet.head list */
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- unsigned long tsq_flags;
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/* Data for direct copy to user */
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struct {
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--- a/net/ipv4/tcp.c
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+++ b/net/ipv4/tcp.c
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@@ -665,9 +665,9 @@ static void tcp_push(struct sock *sk, in
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if (tcp_should_autocork(sk, skb, size_goal)) {
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/* avoid atomic op if TSQ_THROTTLED bit is already set */
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- if (!test_bit(TSQ_THROTTLED, &tp->tsq_flags)) {
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+ if (!test_bit(TSQ_THROTTLED, &sk->sk_tsq_flags)) {
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NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAUTOCORKING);
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- set_bit(TSQ_THROTTLED, &tp->tsq_flags);
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+ set_bit(TSQ_THROTTLED, &sk->sk_tsq_flags);
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}
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/* It is possible TX completion already happened
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* before we set TSQ_THROTTLED.
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--- a/net/ipv4/tcp_ipv4.c
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+++ b/net/ipv4/tcp_ipv4.c
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@@ -446,7 +446,7 @@ void tcp_v4_err(struct sk_buff *icmp_skb
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if (!sock_owned_by_user(sk)) {
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tcp_v4_mtu_reduced(sk);
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} else {
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- if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, &tp->tsq_flags))
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+ if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, &sk->sk_tsq_flags))
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sock_hold(sk);
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}
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goto out;
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--- a/net/ipv4/tcp_output.c
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+++ b/net/ipv4/tcp_output.c
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@@ -772,14 +772,15 @@ static void tcp_tasklet_func(unsigned lo
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list_for_each_safe(q, n, &list) {
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tp = list_entry(q, struct tcp_sock, tsq_node);
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list_del(&tp->tsq_node);
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- clear_bit(TSQ_QUEUED, &tp->tsq_flags);
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sk = (struct sock *)tp;
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+ clear_bit(TSQ_QUEUED, &sk->sk_tsq_flags);
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+
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if (!sk->sk_lock.owned &&
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- test_bit(TCP_TSQ_DEFERRED, &tp->tsq_flags)) {
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+ test_bit(TCP_TSQ_DEFERRED, &sk->sk_tsq_flags)) {
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bh_lock_sock(sk);
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if (!sock_owned_by_user(sk)) {
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- clear_bit(TCP_TSQ_DEFERRED, &tp->tsq_flags);
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+ clear_bit(TCP_TSQ_DEFERRED, &sk->sk_tsq_flags);
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tcp_tsq_handler(sk);
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}
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bh_unlock_sock(sk);
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@@ -802,16 +803,15 @@ static void tcp_tasklet_func(unsigned lo
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*/
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void tcp_release_cb(struct sock *sk)
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{
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- struct tcp_sock *tp = tcp_sk(sk);
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unsigned long flags, nflags;
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/* perform an atomic operation only if at least one flag is set */
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do {
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- flags = tp->tsq_flags;
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+ flags = sk->sk_tsq_flags;
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if (!(flags & TCP_DEFERRED_ALL))
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return;
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nflags = flags & ~TCP_DEFERRED_ALL;
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- } while (cmpxchg(&tp->tsq_flags, flags, nflags) != flags);
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+ } while (cmpxchg(&sk->sk_tsq_flags, flags, nflags) != flags);
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if (flags & TCPF_TSQ_DEFERRED)
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tcp_tsq_handler(sk);
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@@ -883,7 +883,7 @@ void tcp_wfree(struct sk_buff *skb)
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if (wmem >= SKB_TRUESIZE(1) && this_cpu_ksoftirqd() == current)
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goto out;
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- for (oval = READ_ONCE(tp->tsq_flags);; oval = nval) {
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+ for (oval = READ_ONCE(sk->sk_tsq_flags);; oval = nval) {
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struct tsq_tasklet *tsq;
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bool empty;
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@@ -891,7 +891,7 @@ void tcp_wfree(struct sk_buff *skb)
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goto out;
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nval = (oval & ~TSQF_THROTTLED) | TSQF_QUEUED | TCPF_TSQ_DEFERRED;
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- nval = cmpxchg(&tp->tsq_flags, oval, nval);
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+ nval = cmpxchg(&sk->sk_tsq_flags, oval, nval);
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if (nval != oval)
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continue;
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@@ -2136,7 +2136,7 @@ static bool tcp_small_queue_check(struct
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skb->prev == sk->sk_write_queue.next)
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return false;
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- set_bit(TSQ_THROTTLED, &tcp_sk(sk)->tsq_flags);
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+ set_bit(TSQ_THROTTLED, &sk->sk_tsq_flags);
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/* It is possible TX completion already happened
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* before we set TSQ_THROTTLED, so we must
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* test again the condition.
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@@ -2234,8 +2234,8 @@ static bool tcp_write_xmit(struct sock *
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unlikely(tso_fragment(sk, skb, limit, mss_now, gfp)))
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break;
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- if (test_bit(TCP_TSQ_DEFERRED, &tp->tsq_flags))
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- clear_bit(TCP_TSQ_DEFERRED, &tp->tsq_flags);
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+ if (test_bit(TCP_TSQ_DEFERRED, &sk->sk_tsq_flags))
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+ clear_bit(TCP_TSQ_DEFERRED, &sk->sk_tsq_flags);
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if (tcp_small_queue_check(sk, skb, 0))
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break;
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@@ -3542,8 +3542,6 @@ void __tcp_send_ack(struct sock *sk, u32
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/* We do not want pure acks influencing TCP Small Queues or fq/pacing
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* too much.
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* SKB_TRUESIZE(max(1 .. 66, MAX_TCP_HEADER)) is unfortunately ~784
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- * We also avoid tcp_wfree() overhead (cache line miss accessing
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- * tp->tsq_flags) by using regular sock_wfree()
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*/
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skb_set_tcp_pure_ack(buff);
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--- a/net/ipv4/tcp_timer.c
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+++ b/net/ipv4/tcp_timer.c
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@@ -326,7 +326,7 @@ static void tcp_delack_timer(unsigned lo
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inet_csk(sk)->icsk_ack.blocked = 1;
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__NET_INC_STATS(sock_net(sk), LINUX_MIB_DELAYEDACKLOCKED);
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/* deleguate our work to tcp_release_cb() */
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- if (!test_and_set_bit(TCP_DELACK_TIMER_DEFERRED, &tcp_sk(sk)->tsq_flags))
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+ if (!test_and_set_bit(TCP_DELACK_TIMER_DEFERRED, &sk->sk_tsq_flags))
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sock_hold(sk);
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}
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bh_unlock_sock(sk);
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@@ -609,7 +609,7 @@ static void tcp_write_timer(unsigned lon
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tcp_write_timer_handler(sk);
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} else {
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/* delegate our work to tcp_release_cb() */
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- if (!test_and_set_bit(TCP_WRITE_TIMER_DEFERRED, &tcp_sk(sk)->tsq_flags))
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+ if (!test_and_set_bit(TCP_WRITE_TIMER_DEFERRED, &sk->sk_tsq_flags))
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sock_hold(sk);
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}
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bh_unlock_sock(sk);
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--- a/net/ipv6/tcp_ipv6.c
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+++ b/net/ipv6/tcp_ipv6.c
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@@ -404,7 +404,7 @@ static void tcp_v6_err(struct sk_buff *s
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if (!sock_owned_by_user(sk))
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tcp_v6_mtu_reduced(sk);
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else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED,
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- &tp->tsq_flags))
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+ &sk->sk_tsq_flags))
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sock_hold(sk);
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goto out;
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}
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