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net: add sk_wake_async_rcu() helper 

While looking at UDP receive performance, I saw sk_wake_async()
was no longer inlined.

This matters at least on AMD Zen1-4 platforms (see SRSO)

This might be because rcu_read_lock() and rcu_read_unlock()
are no longer nops in recent kernels ?

Add sk_wake_async_rcu() variant, which must be called from
contexts already holding rcu lock.

As SOCK_FASYNC is deprecated in modern days, use unlikely()
to give a hint to the compiler.

sk_wake_async_rcu() is properly inlined from
__udp_enqueue_schedule_skb() and sock_def_readable().

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20240328144032.1864988-5-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2024-03-28 14:40:32 +00:00 committed by Jakub Kicinski
parent 612b1c0dec
commit 1abe267f17
11 changed files with 21 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
crypto/af_alg.c
View File

@ -847,7 +847,7 @@ void af_alg_wmem_wakeup(struct sock *sk)
wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
EPOLLRDNORM |
EPOLLRDBAND);
sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
sk_wake_async_rcu(sk, SOCK_WAKE_WAITD, POLL_IN);
rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(af_alg_wmem_wakeup);
@ -914,7 +914,7 @@ static void af_alg_data_wakeup(struct sock *sk)
wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
EPOLLRDNORM |
EPOLLRDBAND);
sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT);
rcu_read_unlock();
}

6
include/net/sock.h
View File

@ -2513,6 +2513,12 @@ static inline void sk_wake_async(const struct sock *sk, int how, int band)
}
}
static inline void sk_wake_async_rcu(const struct sock *sk, int how, int band)
{
if (unlikely(sock_flag(sk, SOCK_FASYNC)))
sock_wake_async(rcu_dereference(sk->sk_wq), how, band);
}
/* Since sk_{r,w}mem_alloc sums skb->truesize, even a small frame might
* need sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak.
* Note: for send buffers, TCP works better if we can build two skbs at

2
net/atm/common.c
View File

@ -116,7 +116,7 @@ static void vcc_write_space(struct sock *sk)
if (skwq_has_sleeper(wq))
wake_up_interruptible(&wq->wait);
sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT);
}
rcu_read_unlock();

8
net/core/sock.c
View File

@ -3338,7 +3338,7 @@ static void sock_def_error_report(struct sock *sk)
wq = rcu_dereference(sk->sk_wq);
if (skwq_has_sleeper(wq))
wake_up_interruptible_poll(&wq->wait, EPOLLERR);
sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
sk_wake_async_rcu(sk, SOCK_WAKE_IO, POLL_ERR);
rcu_read_unlock();
}
@ -3353,7 +3353,7 @@ void sock_def_readable(struct sock *sk)
if (skwq_has_sleeper(wq))
wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
EPOLLRDNORM | EPOLLRDBAND);
sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
sk_wake_async_rcu(sk, SOCK_WAKE_WAITD, POLL_IN);
rcu_read_unlock();
}
@ -3373,7 +3373,7 @@ static void sock_def_write_space(struct sock *sk)
EPOLLWRNORM | EPOLLWRBAND);
/* Should agree with poll, otherwise some programs break */
sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT);
}
rcu_read_unlock();
@ -3398,7 +3398,7 @@ static void sock_def_write_space_wfree(struct sock *sk)
EPOLLWRNORM | EPOLLWRBAND);
/* Should agree with poll, otherwise some programs break */
sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT);
}
}

2
net/dccp/output.c
View File

@ -204,7 +204,7 @@ void dccp_write_space(struct sock *sk)
wake_up_interruptible(&wq->wait);
/* Should agree with poll, otherwise some programs break */
if (sock_writeable(sk))
sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT);
rcu_read_unlock();
}

2
net/ipv4/udp.c
View File

@ -1544,7 +1544,7 @@ int __udp_enqueue_schedule_skb(struct sock *sk, struct sk_buff *skb)
INDIRECT_CALL_1(sk->sk_data_ready,
sock_def_readable, sk);
else
sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
sk_wake_async_rcu(sk, SOCK_WAKE_WAITD, POLL_IN);
}
busylock_release(busy);
return 0;

2
net/iucv/af_iucv.c
View File

@ -184,7 +184,7 @@ static void iucv_sock_wake_msglim(struct sock *sk)
wq = rcu_dereference(sk->sk_wq);
if (skwq_has_sleeper(wq))
wake_up_interruptible_all(&wq->wait);
sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT);
rcu_read_unlock();
}

2
net/rxrpc/af_rxrpc.c
View File

@ -65,7 +65,7 @@ static void rxrpc_write_space(struct sock *sk)
if (skwq_has_sleeper(wq))
wake_up_interruptible(&wq->wait);
sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT);
}
rcu_read_unlock();
}

2
net/sctp/socket.c
View File

@ -9276,7 +9276,7 @@ void sctp_data_ready(struct sock *sk)
if (skwq_has_sleeper(wq))
wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
EPOLLRDNORM | EPOLLRDBAND);
sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
sk_wake_async_rcu(sk, SOCK_WAKE_WAITD, POLL_IN);
rcu_read_unlock();
}

4
net/smc/smc_rx.c
View File

@ -42,10 +42,10 @@ static void smc_rx_wake_up(struct sock *sk)
if (skwq_has_sleeper(wq))
wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
EPOLLRDNORM | EPOLLRDBAND);
sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
sk_wake_async_rcu(sk, SOCK_WAKE_WAITD, POLL_IN);
if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
(sk->sk_state == SMC_CLOSED))
sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_HUP);
sk_wake_async_rcu(sk, SOCK_WAKE_WAITD, POLL_HUP);
rcu_read_unlock();
}

2
net/unix/af_unix.c
View File

@ -546,7 +546,7 @@ static void unix_write_space(struct sock *sk)
if (skwq_has_sleeper(wq))
wake_up_interruptible_sync_poll(&wq->wait,
EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND);
sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT);
}
rcu_read_unlock();
}