Stefano Garzarella
2021-Feb-22 12:06 UTC
[RFC PATCH v5 05/19] af_vsock: separate wait space loop
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.krasnov at 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 <sgarzare at redhat.com>