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vsock: SO_RCVLOWAT transport set callback

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This adds transport specific callback for SO_RCVLOWAT, because in some
transports it may be difficult to know current available number of bytes
ready to read. Thus, when SO_RCVLOWAT is set, transport may reject it.

Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Arseniy Krasnov 2022-08-19 05:25:19 +00:00 committed by Paolo Abeni
parent ab48508191
commit e38f22c860
2 changed files with 21 additions and 0 deletions
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1
include/net/af_vsock.h
View file

@ -135,6 +135,7 @@ struct vsock_transport {
u64 (*stream_rcvhiwat)(struct vsock_sock *);
bool (*stream_is_active)(struct vsock_sock *);
bool (*stream_allow)(u32 cid, u32 port);
int (*set_rcvlowat)(struct vsock_sock *vsk, int val);
/* SEQ_PACKET. */
ssize_t (*seqpacket_dequeue)(struct vsock_sock *vsk, struct msghdr *msg,

20
net/vmw_vsock/af_vsock.c
View file

@ -2137,6 +2137,25 @@ vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
return err;
}
static int vsock_set_rcvlowat(struct sock *sk, int val)
{
const struct vsock_transport *transport;
struct vsock_sock *vsk;
vsk = vsock_sk(sk);
if (val > vsk->buffer_size)
return -EINVAL;
transport = vsk->transport;
if (transport && transport->set_rcvlowat)
return transport->set_rcvlowat(vsk, val);
WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
return 0;
}
static const struct proto_ops vsock_stream_ops = {
.family = PF_VSOCK,
.owner = THIS_MODULE,
@ -2156,6 +2175,7 @@ static const struct proto_ops vsock_stream_ops = {
.recvmsg = vsock_connectible_recvmsg,
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage,
.set_rcvlowat = vsock_set_rcvlowat,
};
static const struct proto_ops vsock_seqpacket_ops = {