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    Subject[PATCH net-next v4 04/12] vsock: enable SOCK_SUPPORT_ZC bit
    Date
    This bit is used by io_uring in case of zerocopy tx mode. io_uring code
    checks, that socket has this feature. This patch sets it in two places:
    1) For socket in 'connect()' call.
    2) For new socket which is returned by 'accept()' call.

    Signed-off-by: Arseniy Krasnov <avkrasnov@salutedevices.com>
    Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
    ---
    net/vmw_vsock/af_vsock.c | 6 ++++++
    1 file changed, 6 insertions(+)

    diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
    index 71108b1f0dfc..37b1c0432941 100644
    --- a/net/vmw_vsock/af_vsock.c
    +++ b/net/vmw_vsock/af_vsock.c
    @@ -1406,6 +1406,9 @@ static int vsock_connect(struct socket *sock, struct sockaddr *addr,
    goto out;
    }

    + if (vsock_msgzerocopy_allow(transport))
    + set_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags);
    +
    err = vsock_auto_bind(vsk);
    if (err)
    goto out;
    @@ -1560,6 +1563,9 @@ static int vsock_accept(struct socket *sock, struct socket *newsock, int flags,
    } else {
    newsock->state = SS_CONNECTED;
    sock_graft(connected, newsock);
    + if (vsock_msgzerocopy_allow(vconnected->transport))
    + set_bit(SOCK_SUPPORT_ZC,
    + &connected->sk_socket->flags);
    }

    release_sock(connected);
    --
    2.25.1
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