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vsock: check for MSG_ZEROCOPY support on send 

This feature totally depends on transport, so if transport doesn't
support it, return error.

Signed-off-by: Arseniy Krasnov <avkrasnov@salutedevices.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arseniy Krasnov 2023-10-10 22:15:15 +03:00 committed by David S. Miller
parent 49dbe25ada
commit 5fbfc7d243
2 changed files with 13 additions and 0 deletions
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7
include/net/af_vsock.h
View File

@ -177,6 +177,9 @@ struct vsock_transport {
/* Read a single skb */
int (*read_skb)(struct vsock_sock *, skb_read_actor_t);
/* Zero-copy. */
bool (*msgzerocopy_allow)(void);
};
/**** CORE ****/
@ -241,4 +244,8 @@ static inline void __init vsock_bpf_build_proto(void)
{}
#endif
static inline bool vsock_msgzerocopy_allow(const struct vsock_transport *t)
{
return t->msgzerocopy_allow && t->msgzerocopy_allow();
}
#endif /* __AF_VSOCK_H__ */

6
net/vmw_vsock/af_vsock.c
View File

@ -1824,6 +1824,12 @@ static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg,
goto out;
}
if (msg->msg_flags & MSG_ZEROCOPY &&
!vsock_msgzerocopy_allow(transport)) {
err = -EOPNOTSUPP;
goto out;
}
/* Wait for room in the produce queue to enqueue our user's data. */
timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);