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    Subject[RFC PATCH v3 1/9] vsock: SO_RCVLOWAT transport set callback
    Date
    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>
    ---
    include/net/af_vsock.h | 1 +
    net/vmw_vsock/af_vsock.c | 25 +++++++++++++++++++++++++
    2 files changed, 26 insertions(+)

    diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
    index f742e50207fb..eae5874bae35 100644
    --- a/include/net/af_vsock.h
    +++ b/include/net/af_vsock.h
    @@ -134,6 +134,7 @@ 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 *, int);

    /* SEQ_PACKET. */
    ssize_t (*seqpacket_dequeue)(struct vsock_sock *vsk, struct msghdr *msg,
    diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
    index f04abf662ec6..016ad5ff78b7 100644
    --- a/net/vmw_vsock/af_vsock.c
    +++ b/net/vmw_vsock/af_vsock.c
    @@ -2129,6 +2129,30 @@ 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;
    + int err = 0;
    +
    + vsk = vsock_sk(sk);
    +
    + if (val > vsk->buffer_size)
    + return -EINVAL;
    +
    + transport = vsk->transport;
    +
    + if (!transport)
    + return -EOPNOTSUPP;
    +
    + if (transport->set_rcvlowat)
    + err = transport->set_rcvlowat(vsk, val);
    + else
    + WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
    +
    + return err;
    +}
    +
    static const struct proto_ops vsock_stream_ops = {
    .family = PF_VSOCK,
    .owner = THIS_MODULE,
    @@ -2148,6 +2172,7 @@ 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 = {
    --
    2.25.1
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