diff mbox series

[bpf,v5,06/12] bpf: sockmap, wake up polling after data copy

Message ID 20230406010031.3354-7-john.fastabend@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series bpf sockmap fixes | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf, async
netdev/fixes_present success Fixes tag present in non-next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 20 this patch: 20
netdev/cc_maintainers fail 1 blamed authors not CCed: cong.wang@bytedance.com; 4 maintainers not CCed: kuba@kernel.org cong.wang@bytedance.com pabeni@redhat.com davem@davemloft.net
netdev/build_clang success Errors and warnings before: 18 this patch: 18
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success Fixes tag looks correct
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netdev/checkpatch warning WARNING: Please use correct Fixes: style 'Fixes: <12 chars of sha1> ("<title line>")' - ie: 'Fixes: 04919bed948d ("tcp: Introduce tcp_read_skb()")'
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Commit Message

John Fastabend April 6, 2023, 1 a.m. UTC 
When TCP stack has data ready to read sk_data_ready() is called. Sockmap
overwrites this with its own handler to call into BPF verdict program.
But, the original TCP socket had sock_def_readable that would additionally
wake up any user space waiters with sk_wake_async().

Sockmap saved the callback when the socket was created so call the saved
data ready callback and then we can wake up any epoll() logic waiting
on the read.

Note we call on 'copied >= 0' to account for returning 0 when a FIN is
received because we need to wake up user for this as well so they
can do the recvmsg() -> 0 and detect the shutdown.

Fixes: 04919bed948dc ("tcp: Introduce tcp_read_skb()")
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
---
 net/core/skmsg.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/net/core/skmsg.c b/net/core/skmsg.c
index f8731818b5c3..a2e83d2aacf8 100644
--- a/net/core/skmsg.c
+++ b/net/core/skmsg.c
@@ -1234,12 +1234,21 @@  static int sk_psock_verdict_recv(struct sock *sk, struct sk_buff *skb)
 static void sk_psock_verdict_data_ready(struct sock *sk)
 {
 	struct socket *sock = sk->sk_socket;
+	int copied;
 
 	trace_sk_data_ready(sk);
 
 	if (unlikely(!sock || !sock->ops || !sock->ops->read_skb))
 		return;
-	sock->ops->read_skb(sk, sk_psock_verdict_recv);
+	copied = sock->ops->read_skb(sk, sk_psock_verdict_recv);
+	if (copied >= 0) {
+		struct sk_psock *psock;
+
+		rcu_read_lock();
+		psock = sk_psock(sk);
+		psock->saved_data_ready(sk);
+		rcu_read_unlock();
+	}
 }
 
 void sk_psock_start_verdict(struct sock *sk, struct sk_psock *psock)