| Message ID | 20230423192643.1537470-9-AVKrasnov@sberdevices.ru (mailing list archive) |
|---|---|
| State | RFC |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | vsock: MSG_ZEROCOPY flag support | expand |
| Context | Check | Description |
|---|---|---|
| netdev/tree_selection | success | Guessing tree name failed - patch did not apply, async |
diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h index 0e7504a42925..270ca54cfab8 100644 --- a/include/net/af_vsock.h +++ b/include/net/af_vsock.h @@ -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 ****/ diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index c50d2632a75f..eac8c1affd6a 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -1824,6 +1824,13 @@ static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg, goto out; } + if (msg->msg_flags & MSG_ZEROCOPY && + (!transport->msgzerocopy_allow || + !transport->msgzerocopy_allow())) { + 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);
This feature totally depends on transport, so if transport doesn't support it, return error. Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru> --- include/net/af_vsock.h | 3 +++ net/vmw_vsock/af_vsock.c | 7 +++++++ 2 files changed, 10 insertions(+)