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vsock: add API call for data ready 

This adds 'vsock_data_ready()' which must be called by transport to kick
sleeping data readers. It checks for SO_RCVLOWAT value before waking
user, thus preventing spurious wake ups. Based on 'tcp_data_ready()' logic.

Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Arseniy Krasnov 2022-08-19 05:36:52 +00:00 committed by Paolo Abeni
parent ee0b3843a2
commit f2fdcf67ac
2 changed files with 11 additions and 0 deletions
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1
include/net/af_vsock.h
View File

@ -78,6 +78,7 @@ struct vsock_sock {
s64 vsock_stream_has_data(struct vsock_sock *vsk);
s64 vsock_stream_has_space(struct vsock_sock *vsk);
struct sock *vsock_create_connected(struct sock *parent);
void vsock_data_ready(struct sock *sk);
/**** TRANSPORT ****/

10
net/vmw_vsock/af_vsock.c
View File

@ -882,6 +882,16 @@ s64 vsock_stream_has_space(struct vsock_sock *vsk)
}
EXPORT_SYMBOL_GPL(vsock_stream_has_space);
void vsock_data_ready(struct sock *sk)
{
struct vsock_sock *vsk = vsock_sk(sk);
if (vsock_stream_has_data(vsk) >= sk->sk_rcvlowat ||
sock_flag(sk, SOCK_DONE))
sk->sk_data_ready(sk);
}
EXPORT_SYMBOL_GPL(vsock_data_ready);
static int vsock_release(struct socket *sock)
{
__vsock_release(sock->sk, 0);