On Thu, Feb 18, 2021 at 08:37:54AM +0300, Arseny Krasnov wrote:
This moves loop that waits for space on send to separate function, because it will be used for SEQ_BEGIN/SEQ_END sending before and after data transmission. Waiting for SEQ_BEGIN/SEQ_END is needed because such packets carries SEQPACKET header that couldn't be fragmented by credit mechanism, so to avoid it, sender waits until enough space will be ready.Signed-off-by: Arseny Krasnov <arseny.kras...@kaspersky.com> --- include/net/af_vsock.h | 2 + net/vmw_vsock/af_vsock.c | 99 +++++++++++++++++++++++++--------------- 2 files changed, 63 insertions(+), 38 deletions(-) diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h index 01563338cc03..6fbe88306403 100644 --- a/include/net/af_vsock.h +++ b/include/net/af_vsock.h @@ -205,6 +205,8 @@ void vsock_remove_sock(struct vsock_sock *vsk); void vsock_for_each_connected_socket(void (*fn)(struct sock *sk)); int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk); bool vsock_find_cid(unsigned int cid); +int vsock_wait_space(struct sock *sk, size_t space, int flags, + struct vsock_transport_send_notify_data *send_data); /**** TAP ****/ diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index b754927a556a..09b377422b1e 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -1692,6 +1692,65 @@ static int vsock_connectible_getsockopt(struct socket *sock, return 0; } +int vsock_wait_space(struct sock *sk, size_t space, int flags, + struct vsock_transport_send_notify_data *send_data) +{ + const struct vsock_transport *transport; + struct vsock_sock *vsk; + long timeout; + int err; + + DEFINE_WAIT_FUNC(wait, woken_wake_function); + + vsk = vsock_sk(sk); + transport = vsk->transport; + timeout = sock_sndtimeo(sk, flags & MSG_DONTWAIT); + err = 0; + + add_wait_queue(sk_sleep(sk), &wait); + + while (vsock_stream_has_space(vsk) < space && + sk->sk_err == 0 && + !(sk->sk_shutdown & SEND_SHUTDOWN) && + !(vsk->peer_shutdown & RCV_SHUTDOWN)) { + + /* Don't wait for non-blocking sockets. */ + if (timeout == 0) { + err = -EAGAIN; + goto out_err; + } + + if (send_data) { + err = transport->notify_send_pre_block(vsk, send_data); + if (err < 0) + goto out_err; + } + + release_sock(sk); + timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout); + lock_sock(sk); + if (signal_pending(current)) { + err = sock_intr_errno(timeout); + goto out_err; + } else if (timeout == 0) { + err = -EAGAIN; + goto out_err; + } + } + + if (sk->sk_err) { + err = -sk->sk_err; + } else if ((sk->sk_shutdown & SEND_SHUTDOWN) || + (vsk->peer_shutdown & RCV_SHUTDOWN)) { + err = -EPIPE; + } + +out_err: + remove_wait_queue(sk_sleep(sk), &wait); + return err; +} +EXPORT_SYMBOL_GPL(vsock_wait_space); + static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) { @@ -1699,10 +1758,8 @@ static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg, struct vsock_sock *vsk; const struct vsock_transport *transport; ssize_t total_written; - long timeout; int err; struct vsock_transport_send_notify_data send_data; - DEFINE_WAIT_FUNC(wait, woken_wake_function); sk = sock->sk; vsk = vsock_sk(sk); @@ -1740,9 +1797,6 @@ static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg, goto out; } - /* Wait for room in the produce queue to enqueue our user's data. */ - timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); - err = transport->notify_send_init(vsk, &send_data); if (err < 0) goto out; @@ -1750,39 +1804,8 @@ static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg, while (total_written < len) { ssize_t written; - add_wait_queue(sk_sleep(sk), &wait); - while (vsock_stream_has_space(vsk) == 0 && - sk->sk_err == 0 && - !(sk->sk_shutdown & SEND_SHUTDOWN) && - !(vsk->peer_shutdown & RCV_SHUTDOWN)) { - - /* Don't wait for non-blocking sockets. */ - if (timeout == 0) { - err = -EAGAIN; - remove_wait_queue(sk_sleep(sk), &wait); - goto out_err; - } - - err = transport->notify_send_pre_block(vsk, &send_data); - if (err < 0) { - remove_wait_queue(sk_sleep(sk), &wait); - goto out_err; - } - - release_sock(sk); - timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout); - lock_sock(sk); - if (signal_pending(current)) { - err = sock_intr_errno(timeout); - remove_wait_queue(sk_sleep(sk), &wait); - goto out_err; - } else if (timeout == 0) { - err = -EAGAIN; - remove_wait_queue(sk_sleep(sk), &wait); - goto out_err; - } - } - remove_wait_queue(sk_sleep(sk), &wait); + if (vsock_wait_space(sk, 1, msg->msg_flags, &send_data)) + goto out_err; /* These checks occur both as part of and after the loop * conditional since we need to check before and after -- 2.25.1
The patch LGTM: Reviewed-by: Stefano Garzarella <sgarz...@redhat.com>
