This moves wait loop for data to dedicated function, because later
it will be used by SEQPACKET data receive loop.
Signed-off-by: Arseny Krasnov <[email protected]>
---
net/vmw_vsock/af_vsock.c | 155 +++++++++++++++++++++------------------
1 file changed, 83 insertions(+), 72 deletions(-)
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 656370e11707..6cf7bb977aa1 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -1832,6 +1832,68 @@ static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg,
return err;
}
+static int vsock_wait_data(struct sock *sk, struct wait_queue_entry *wait,
+ long timeout,
+ struct vsock_transport_recv_notify_data *recv_data,
+ size_t target)
+{
+ const struct vsock_transport *transport;
+ struct vsock_sock *vsk;
+ s64 data;
+ int err;
+
+ vsk = vsock_sk(sk);
+ err = 0;
+ transport = vsk->transport;
+ prepare_to_wait(sk_sleep(sk), wait, TASK_INTERRUPTIBLE);
+
+ while ((data = vsock_stream_has_data(vsk)) == 0) {
+ if (sk->sk_err != 0 ||
+ (sk->sk_shutdown & RCV_SHUTDOWN) ||
+ (vsk->peer_shutdown & SEND_SHUTDOWN)) {
+ break;
+ }
+
+ /* Don't wait for non-blocking sockets. */
+ if (timeout == 0) {
+ err = -EAGAIN;
+ break;
+ }
+
+ if (recv_data) {
+ err = transport->notify_recv_pre_block(vsk, target, recv_data);
+ if (err < 0)
+ break;
+ }
+
+ release_sock(sk);
+ timeout = schedule_timeout(timeout);
+ lock_sock(sk);
+
+ if (signal_pending(current)) {
+ err = sock_intr_errno(timeout);
+ break;
+ } else if (timeout == 0) {
+ err = -EAGAIN;
+ break;
+ }
+ }
+
+ finish_wait(sk_sleep(sk), wait);
+
+ if (err)
+ return err;
+
+ /* Internal transport error when checking for available
+ * data. XXX This should be changed to a connection
+ * reset in a later change.
+ */
+ if (data < 0)
+ return -ENOMEM;
+
+ return data;
+}
+
static int
vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
int flags)
@@ -1911,85 +1973,34 @@ vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
while (1) {
- s64 ready;
-
- prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
- ready = vsock_stream_has_data(vsk);
-
- if (ready == 0) {
- if (sk->sk_err != 0 ||
- (sk->sk_shutdown & RCV_SHUTDOWN) ||
- (vsk->peer_shutdown & SEND_SHUTDOWN)) {
- finish_wait(sk_sleep(sk), &wait);
- break;
- }
- /* Don't wait for non-blocking sockets. */
- if (timeout == 0) {
- err = -EAGAIN;
- finish_wait(sk_sleep(sk), &wait);
- break;
- }
+ ssize_t read;
- err = transport->notify_recv_pre_block(
- vsk, target, &recv_data);
- if (err < 0) {
- finish_wait(sk_sleep(sk), &wait);
- break;
- }
- release_sock(sk);
- timeout = schedule_timeout(timeout);
- lock_sock(sk);
+ err = vsock_wait_data(sk, &wait, timeout, &recv_data, target);
+ if (err <= 0)
+ break;
- if (signal_pending(current)) {
- err = sock_intr_errno(timeout);
- finish_wait(sk_sleep(sk), &wait);
- break;
- } else if (timeout == 0) {
- err = -EAGAIN;
- finish_wait(sk_sleep(sk), &wait);
- break;
- }
- } else {
- ssize_t read;
-
- finish_wait(sk_sleep(sk), &wait);
-
- if (ready < 0) {
- /* Invalid queue pair content. XXX This should
- * be changed to a connection reset in a later
- * change.
- */
-
- err = -ENOMEM;
- goto out;
- }
-
- err = transport->notify_recv_pre_dequeue(
- vsk, target, &recv_data);
- if (err < 0)
- break;
+ err = transport->notify_recv_pre_dequeue(vsk, target,
+ &recv_data);
+ if (err < 0)
+ break;
- read = transport->stream_dequeue(
- vsk, msg,
- len - copied, flags);
- if (read < 0) {
- err = -ENOMEM;
- break;
- }
+ read = transport->stream_dequeue(vsk, msg, len - copied, flags);
+ if (read < 0) {
+ err = -ENOMEM;
+ break;
+ }
- copied += read;
+ copied += read;
- err = transport->notify_recv_post_dequeue(
- vsk, target, read,
- !(flags & MSG_PEEK), &recv_data);
- if (err < 0)
- goto out;
+ err = transport->notify_recv_post_dequeue(vsk, target, read,
+ !(flags & MSG_PEEK), &recv_data);
+ if (err < 0)
+ goto out;
- if (read >= target || flags & MSG_PEEK)
- break;
+ if (read >= target || flags & MSG_PEEK)
+ break;
- target -= read;
- }
+ target -= read;
}
if (sk->sk_err)
--
2.25.1
On Thu, Feb 18, 2021 at 08:36:33AM +0300, Arseny Krasnov wrote:
>This moves wait loop for data to dedicated function, because later
>it will be used by SEQPACKET data receive loop.
The patch LGTM, maybe just add a line in the commit message with
something like this:
While moving the code around, let's update an old comment.
Whit that fixed:
Reviewed-by: Stefano Garzarella <[email protected]>
>
>Signed-off-by: Arseny Krasnov <[email protected]>
>---
> net/vmw_vsock/af_vsock.c | 155 +++++++++++++++++++++------------------
> 1 file changed, 83 insertions(+), 72 deletions(-)
>
>diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
>index 656370e11707..6cf7bb977aa1 100644
>--- a/net/vmw_vsock/af_vsock.c
>+++ b/net/vmw_vsock/af_vsock.c
>@@ -1832,6 +1832,68 @@ static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg,
> return err;
> }
>
>+static int vsock_wait_data(struct sock *sk, struct wait_queue_entry *wait,
>+ long timeout,
>+ struct vsock_transport_recv_notify_data *recv_data,
>+ size_t target)
>+{
>+ const struct vsock_transport *transport;
>+ struct vsock_sock *vsk;
>+ s64 data;
>+ int err;
>+
>+ vsk = vsock_sk(sk);
>+ err = 0;
>+ transport = vsk->transport;
>+ prepare_to_wait(sk_sleep(sk), wait, TASK_INTERRUPTIBLE);
>+
>+ while ((data = vsock_stream_has_data(vsk)) == 0) {
>+ if (sk->sk_err != 0 ||
>+ (sk->sk_shutdown & RCV_SHUTDOWN) ||
>+ (vsk->peer_shutdown & SEND_SHUTDOWN)) {
>+ break;
>+ }
>+
>+ /* Don't wait for non-blocking sockets. */
>+ if (timeout == 0) {
>+ err = -EAGAIN;
>+ break;
>+ }
>+
>+ if (recv_data) {
>+ err = transport->notify_recv_pre_block(vsk, target, recv_data);
>+ if (err < 0)
>+ break;
>+ }
>+
>+ release_sock(sk);
>+ timeout = schedule_timeout(timeout);
>+ lock_sock(sk);
>+
>+ if (signal_pending(current)) {
>+ err = sock_intr_errno(timeout);
>+ break;
>+ } else if (timeout == 0) {
>+ err = -EAGAIN;
>+ break;
>+ }
>+ }
>+
>+ finish_wait(sk_sleep(sk), wait);
>+
>+ if (err)
>+ return err;
>+
>+ /* Internal transport error when checking for available
>+ * data. XXX This should be changed to a connection
>+ * reset in a later change.
>+ */
>+ if (data < 0)
>+ return -ENOMEM;
>+
>+ return data;
>+}
>+
> static int
> vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
> int flags)
>@@ -1911,85 +1973,34 @@ vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
>
>
> while (1) {
>- s64 ready;
>-
>- prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
>- ready = vsock_stream_has_data(vsk);
>-
>- if (ready == 0) {
>- if (sk->sk_err != 0 ||
>- (sk->sk_shutdown & RCV_SHUTDOWN) ||
>- (vsk->peer_shutdown & SEND_SHUTDOWN)) {
>- finish_wait(sk_sleep(sk), &wait);
>- break;
>- }
>- /* Don't wait for non-blocking sockets. */
>- if (timeout == 0) {
>- err = -EAGAIN;
>- finish_wait(sk_sleep(sk), &wait);
>- break;
>- }
>+ ssize_t read;
>
>- err = transport->notify_recv_pre_block(
>- vsk, target, &recv_data);
>- if (err < 0) {
>- finish_wait(sk_sleep(sk), &wait);
>- break;
>- }
>- release_sock(sk);
>- timeout = schedule_timeout(timeout);
>- lock_sock(sk);
>+ err = vsock_wait_data(sk, &wait, timeout, &recv_data, target);
>+ if (err <= 0)
>+ break;
>
>- if (signal_pending(current)) {
>- err = sock_intr_errno(timeout);
>- finish_wait(sk_sleep(sk), &wait);
>- break;
>- } else if (timeout == 0) {
>- err = -EAGAIN;
>- finish_wait(sk_sleep(sk), &wait);
>- break;
>- }
>- } else {
>- ssize_t read;
>-
>- finish_wait(sk_sleep(sk), &wait);
>-
>- if (ready < 0) {
>- /* Invalid queue pair content. XXX This should
>- * be changed to a connection reset in a later
>- * change.
>- */
>-
>- err = -ENOMEM;
>- goto out;
>- }
>-
>- err = transport->notify_recv_pre_dequeue(
>- vsk, target, &recv_data);
>- if (err < 0)
>- break;
>+ err = transport->notify_recv_pre_dequeue(vsk, target,
>+ &recv_data);
>+ if (err < 0)
>+ break;
>
>- read = transport->stream_dequeue(
>- vsk, msg,
>- len - copied, flags);
>- if (read < 0) {
>- err = -ENOMEM;
>- break;
>- }
>+ read = transport->stream_dequeue(vsk, msg, len - copied, flags);
>+ if (read < 0) {
>+ err = -ENOMEM;
>+ break;
>+ }
>
>- copied += read;
>+ copied += read;
>
>- err = transport->notify_recv_post_dequeue(
>- vsk, target, read,
>- !(flags & MSG_PEEK), &recv_data);
>- if (err < 0)
>- goto out;
>+ err = transport->notify_recv_post_dequeue(vsk, target, read,
>+ !(flags & MSG_PEEK), &recv_data);
>+ if (err < 0)
>+ goto out;
>
>- if (read >= target || flags & MSG_PEEK)
>- break;
>+ if (read >= target || flags & MSG_PEEK)
>+ break;
>
>- target -= read;
>- }
>+ target -= read;
> }
>
> if (sk->sk_err)
>--
>2.25.1
>
> On 18 Feb 2021, at 06:36, Arseny Krasnov <[email protected]> wrote:
>
> This moves wait loop for data to dedicated function, because later
> it will be used by SEQPACKET data receive loop.
>
> Signed-off-by: Arseny Krasnov <[email protected]>
> ---
> net/vmw_vsock/af_vsock.c | 155 +++++++++++++++++++++------------------
> 1 file changed, 83 insertions(+), 72 deletions(-)
>
> diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
> index 656370e11707..6cf7bb977aa1 100644
> --- a/net/vmw_vsock/af_vsock.c
> +++ b/net/vmw_vsock/af_vsock.c
> @@ -1832,6 +1832,68 @@ static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg,
> return err;
> }
>
> +static int vsock_wait_data(struct sock *sk, struct wait_queue_entry *wait,
> + long timeout,
> + struct vsock_transport_recv_notify_data *recv_data,
> + size_t target)
> +{
> + const struct vsock_transport *transport;
> + struct vsock_sock *vsk;
> + s64 data;
> + int err;
> +
> + vsk = vsock_sk(sk);
> + err = 0;
> + transport = vsk->transport;
> + prepare_to_wait(sk_sleep(sk), wait, TASK_INTERRUPTIBLE);
> +
> + while ((data = vsock_stream_has_data(vsk)) == 0) {
In the original code, the prepare_to_wait() is called for each iteration of the while loop. In this
version, it is only called once. So if we do multiple iterations, the thread would be in the
TASK_RUNNING state, and subsequent schedule_timeout() will return immediately. So
looks like the prepare_to_wait() should be move here, in case we have a spurious wake_up.
> + if (sk->sk_err != 0 ||
> + (sk->sk_shutdown & RCV_SHUTDOWN) ||
> + (vsk->peer_shutdown & SEND_SHUTDOWN)) {
> + break;
> + }
> +
> + /* Don't wait for non-blocking sockets. */
> + if (timeout == 0) {
> + err = -EAGAIN;
> + break;
> + }
> +
> + if (recv_data) {
> + err = transport->notify_recv_pre_block(vsk, target, recv_data);
> + if (err < 0)
> + break;
> + }
> +
> + release_sock(sk);
> + timeout = schedule_timeout(timeout);
> + lock_sock(sk);
> +
> + if (signal_pending(current)) {
> + err = sock_intr_errno(timeout);
> + break;
> + } else if (timeout == 0) {
> + err = -EAGAIN;
> + break;
> + }
> + }
> +
> + finish_wait(sk_sleep(sk), wait);
> +
> + if (err)
> + return err;
> +
> + /* Internal transport error when checking for available
> + * data. XXX This should be changed to a connection
> + * reset in a later change.
> + */
> + if (data < 0)
> + return -ENOMEM;
> +
> + return data;
> +}
> +
> static int
> vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
> int flags)
> @@ -1911,85 +1973,34 @@ vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
>
>
> while (1) {
> - s64 ready;
> -
> - prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
> - ready = vsock_stream_has_data(vsk);
> -
> - if (ready == 0) {
> - if (sk->sk_err != 0 ||
> - (sk->sk_shutdown & RCV_SHUTDOWN) ||
> - (vsk->peer_shutdown & SEND_SHUTDOWN)) {
> - finish_wait(sk_sleep(sk), &wait);
> - break;
> - }
> - /* Don't wait for non-blocking sockets. */
> - if (timeout == 0) {
> - err = -EAGAIN;
> - finish_wait(sk_sleep(sk), &wait);
> - break;
> - }
> + ssize_t read;
>
> - err = transport->notify_recv_pre_block(
> - vsk, target, &recv_data);
> - if (err < 0) {
> - finish_wait(sk_sleep(sk), &wait);
> - break;
> - }
> - release_sock(sk);
> - timeout = schedule_timeout(timeout);
> - lock_sock(sk);
> + err = vsock_wait_data(sk, &wait, timeout, &recv_data, target);
> + if (err <= 0)
> + break;
>
> - if (signal_pending(current)) {
> - err = sock_intr_errno(timeout);
> - finish_wait(sk_sleep(sk), &wait);
> - break;
> - } else if (timeout == 0) {
> - err = -EAGAIN;
> - finish_wait(sk_sleep(sk), &wait);
> - break;
> - }
> - } else {
> - ssize_t read;
> -
> - finish_wait(sk_sleep(sk), &wait);
> -
> - if (ready < 0) {
> - /* Invalid queue pair content. XXX This should
> - * be changed to a connection reset in a later
> - * change.
> - */
> -
> - err = -ENOMEM;
> - goto out;
> - }
> -
> - err = transport->notify_recv_pre_dequeue(
> - vsk, target, &recv_data);
> - if (err < 0)
> - break;
> + err = transport->notify_recv_pre_dequeue(vsk, target,
> + &recv_data);
> + if (err < 0)
> + break;
>
> - read = transport->stream_dequeue(
> - vsk, msg,
> - len - copied, flags);
> - if (read < 0) {
> - err = -ENOMEM;
> - break;
> - }
> + read = transport->stream_dequeue(vsk, msg, len - copied, flags);
> + if (read < 0) {
> + err = -ENOMEM;
> + break;
> + }
>
> - copied += read;
> + copied += read;
>
> - err = transport->notify_recv_post_dequeue(
> - vsk, target, read,
> - !(flags & MSG_PEEK), &recv_data);
> - if (err < 0)
> - goto out;
> + err = transport->notify_recv_post_dequeue(vsk, target, read,
> + !(flags & MSG_PEEK), &recv_data);
> + if (err < 0)
> + goto out;
>
> - if (read >= target || flags & MSG_PEEK)
> - break;
> + if (read >= target || flags & MSG_PEEK)
> + break;
>
> - target -= read;
> - }
> + target -= read;
> }
>
> if (sk->sk_err)
> --
> 2.25.1
>
On 25.02.2021 17:24, Jorgen Hansen wrote:
>> On 18 Feb 2021, at 06:36, Arseny Krasnov <[email protected]> wrote:
>>
>> This moves wait loop for data to dedicated function, because later
>> it will be used by SEQPACKET data receive loop.
>>
>> Signed-off-by: Arseny Krasnov <[email protected]>
>> ---
>> net/vmw_vsock/af_vsock.c | 155 +++++++++++++++++++++------------------
>> 1 file changed, 83 insertions(+), 72 deletions(-)
>>
>> diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
>> index 656370e11707..6cf7bb977aa1 100644
>> --- a/net/vmw_vsock/af_vsock.c
>> +++ b/net/vmw_vsock/af_vsock.c
>> @@ -1832,6 +1832,68 @@ static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg,
>> return err;
>> }
>>
>> +static int vsock_wait_data(struct sock *sk, struct wait_queue_entry *wait,
>> + long timeout,
>> + struct vsock_transport_recv_notify_data *recv_data,
>> + size_t target)
>> +{
>> + const struct vsock_transport *transport;
>> + struct vsock_sock *vsk;
>> + s64 data;
>> + int err;
>> +
>> + vsk = vsock_sk(sk);
>> + err = 0;
>> + transport = vsk->transport;
>> + prepare_to_wait(sk_sleep(sk), wait, TASK_INTERRUPTIBLE);
>> +
>> + while ((data = vsock_stream_has_data(vsk)) == 0) {
> In the original code, the prepare_to_wait() is called for each iteration of the while loop. In this
> version, it is only called once. So if we do multiple iterations, the thread would be in the
> TASK_RUNNING state, and subsequent schedule_timeout() will return immediately. So
> looks like the prepare_to_wait() should be move here, in case we have a spurious wake_up.
Thank you, i'll fix it
>
>> + if (sk->sk_err != 0 ||
>> + (sk->sk_shutdown & RCV_SHUTDOWN) ||
>> + (vsk->peer_shutdown & SEND_SHUTDOWN)) {
>> + break;
>> + }
>> +
>> + /* Don't wait for non-blocking sockets. */
>> + if (timeout == 0) {
>> + err = -EAGAIN;
>> + break;
>> + }
>> +
>> + if (recv_data) {
>> + err = transport->notify_recv_pre_block(vsk, target, recv_data);
>> + if (err < 0)
>> + break;
>> + }
>> +
>> + release_sock(sk);
>> + timeout = schedule_timeout(timeout);
>> + lock_sock(sk);
>> +
>> + if (signal_pending(current)) {
>> + err = sock_intr_errno(timeout);
>> + break;
>> + } else if (timeout == 0) {
>> + err = -EAGAIN;
>> + break;
>> + }
>> + }
>> +
>> + finish_wait(sk_sleep(sk), wait);
>> +
>> + if (err)
>> + return err;
>> +
>> + /* Internal transport error when checking for available
>> + * data. XXX This should be changed to a connection
>> + * reset in a later change.
>> + */
>> + if (data < 0)
>> + return -ENOMEM;
>> +
>> + return data;
>> +}
>> +
>> static int
>> vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
>> int flags)
>> @@ -1911,85 +1973,34 @@ vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
>>
>>
>> while (1) {
>> - s64 ready;
>> -
>> - prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
>> - ready = vsock_stream_has_data(vsk);
>> -
>> - if (ready == 0) {
>> - if (sk->sk_err != 0 ||
>> - (sk->sk_shutdown & RCV_SHUTDOWN) ||
>> - (vsk->peer_shutdown & SEND_SHUTDOWN)) {
>> - finish_wait(sk_sleep(sk), &wait);
>> - break;
>> - }
>> - /* Don't wait for non-blocking sockets. */
>> - if (timeout == 0) {
>> - err = -EAGAIN;
>> - finish_wait(sk_sleep(sk), &wait);
>> - break;
>> - }
>> + ssize_t read;
>>
>> - err = transport->notify_recv_pre_block(
>> - vsk, target, &recv_data);
>> - if (err < 0) {
>> - finish_wait(sk_sleep(sk), &wait);
>> - break;
>> - }
>> - release_sock(sk);
>> - timeout = schedule_timeout(timeout);
>> - lock_sock(sk);
>> + err = vsock_wait_data(sk, &wait, timeout, &recv_data, target);
>> + if (err <= 0)
>> + break;
>>
>> - if (signal_pending(current)) {
>> - err = sock_intr_errno(timeout);
>> - finish_wait(sk_sleep(sk), &wait);
>> - break;
>> - } else if (timeout == 0) {
>> - err = -EAGAIN;
>> - finish_wait(sk_sleep(sk), &wait);
>> - break;
>> - }
>> - } else {
>> - ssize_t read;
>> -
>> - finish_wait(sk_sleep(sk), &wait);
>> -
>> - if (ready < 0) {
>> - /* Invalid queue pair content. XXX This should
>> - * be changed to a connection reset in a later
>> - * change.
>> - */
>> -
>> - err = -ENOMEM;
>> - goto out;
>> - }
>> -
>> - err = transport->notify_recv_pre_dequeue(
>> - vsk, target, &recv_data);
>> - if (err < 0)
>> - break;
>> + err = transport->notify_recv_pre_dequeue(vsk, target,
>> + &recv_data);
>> + if (err < 0)
>> + break;
>>
>> - read = transport->stream_dequeue(
>> - vsk, msg,
>> - len - copied, flags);
>> - if (read < 0) {
>> - err = -ENOMEM;
>> - break;
>> - }
>> + read = transport->stream_dequeue(vsk, msg, len - copied, flags);
>> + if (read < 0) {
>> + err = -ENOMEM;
>> + break;
>> + }
>>
>> - copied += read;
>> + copied += read;
>>
>> - err = transport->notify_recv_post_dequeue(
>> - vsk, target, read,
>> - !(flags & MSG_PEEK), &recv_data);
>> - if (err < 0)
>> - goto out;
>> + err = transport->notify_recv_post_dequeue(vsk, target, read,
>> + !(flags & MSG_PEEK), &recv_data);
>> + if (err < 0)
>> + goto out;
>>
>> - if (read >= target || flags & MSG_PEEK)
>> - break;
>> + if (read >= target || flags & MSG_PEEK)
>> + break;
>>
>> - target -= read;
>> - }
>> + target -= read;
>> }
>>
>> if (sk->sk_err)
>> --
>> 2.25.1
>>
>