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Date: Thu, 28 Mar 2024 14:40:32 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: Willem de Bruijn <willemb@...gle.com>, netdev@...r.kernel.org, eric.dumazet@...il.com,
Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 4/4] 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@...gle.com>
---
crypto/af_alg.c | 4 ++--
include/net/sock.h | 6 ++++++
net/atm/common.c | 2 +-
net/core/sock.c | 8 ++++----
net/dccp/output.c | 2 +-
net/ipv4/udp.c | 2 +-
net/iucv/af_iucv.c | 2 +-
net/rxrpc/af_rxrpc.c | 2 +-
net/sctp/socket.c | 2 +-
net/smc/smc_rx.c | 4 ++--
net/unix/af_unix.c | 2 +-
11 files changed, 21 insertions(+), 15 deletions(-)
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index 68cc9290cabe9a9f8a264908466897f2f93e039d..5bc6d0fa7498df30fdf002ec7bcfb46ed4344e8c 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -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();
}
diff --git a/include/net/sock.h b/include/net/sock.h
index b5e00702acc1f037df7eb8ad085d00e0b18079a8..38adc3970500f4ae1b8d5ade343c5fbe1d04e085 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2506,6 +2506,12 @@ 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
diff --git a/net/atm/common.c b/net/atm/common.c
index 2a1ec014e901d6549732e7bce35bce6a9eb467e0..9b75699992ff9244470c143433f444fb9d46c3b2 100644
--- a/net/atm/common.c
+++ b/net/atm/common.c
@@ -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();
diff --git a/net/core/sock.c b/net/core/sock.c
index 43bf3818c19e829b47d3989d36e2e1b3bf985438..b9203fccaf1e29ba8e5f48b44987abb79f28fc60 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -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);
}
}
diff --git a/net/dccp/output.c b/net/dccp/output.c
index fd2eb148d24de4d1b9e40c6721577ed7f11b5a6c..5c2e24f3c39b7ff4ee1d5d96d5e406c96609a022 100644
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -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();
}
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 5dfbe4499c0f89f94af9ee1fb64559dd672c1439..4119e74fee02b3930075fe5b00c0fc753a620149 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -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;
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index 7c8c3adcac6e94379360ef6e609c48e3b396ceaa..c951bb9cc2e044249ff7e4f86470b4035d60aeaa 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -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();
}
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 5222bc97d192e05e2169dcf5f548fdeb98e6b07b..f4844683e12039d636253cb06f622468593487eb 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -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();
}
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index c67679a41044fc8e801d175b235249f2c8b99dc0..e416b6d3d2705286d3e5af18b2314bceacfb98b1 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -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();
}
diff --git a/net/smc/smc_rx.c b/net/smc/smc_rx.c
index 9a2f3638d161d2ff7d7261835a5b13be63b11701..f0cbe77a80b44046b880e5a7107f535507c76c7c 100644
--- a/net/smc/smc_rx.c
+++ b/net/smc/smc_rx.c
@@ -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();
}
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 5b41e2321209ae0a17ac97d7214eefd252ec0180..ee382cf55f2016d19e600b6fde75da12b53bea09 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -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();
}
--
2.44.0.396.g6e790dbe36-goog
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