vsock: return errors other than -ENOMEM to socket

vsock: return errors other than -ENOMEM to socket

[Arseniy Krasnov]

Hello,

this patchset removes behaviour, where error code returned from any
transport was always switched to ENOMEM. This works in the same way as
patch from Bobby Eshleman:
commit c43170b7e157 ("vsock: return errors other than -ENOMEM to socket"),
but for receive calls. VMCI transport is also updated (both tx and rx
SOCK_STREAM callbacks), because it returns VMCI specific error code to
af_vsock.c (like VMCI_ERROR_*). At the same time, virtio and Hyper-V
transports are using general error codes, so there is no need to update
them.

vsock_test suite is also updated.

Link to v1:
https://lore.kernel.org/netdev/97f19214-ba04-c47e-7486-72e8aa16c690@sberdevices.ru/

Changelog:

v1 -> v2:
 - Add patch for VMCI as Vishnu Dasa suggested.

Arseniy Krasnov (3):
  vsock: return errors other than -ENOMEM to socket
  vsock/vmci: convert VMCI error code to -ENOMEM
  vsock/test: update expected return values

 net/vmw_vsock/af_vsock.c         |  4 ++--
 net/vmw_vsock/vmci_transport.c   | 19 ++++++++++++++++---
 tools/testing/vsock/vsock_test.c |  4 ++--
 3 files changed, 20 insertions(+), 7 deletions(-)

-- 
2.25.1

[RFC PATCH v2 1/3] vsock: return errors other than -ENOMEM to socket

[Arseniy Krasnov]

This removes behaviour, where error code returned from any transport
was always switched to ENOMEM. This works in the same way as:
commit
c43170b7e157 ("vsock: return errors other than -ENOMEM to socket"),
but for receive calls.

Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
---
 net/vmw_vsock/af_vsock.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 5f2dda35c980..413407bb646c 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -2043,7 +2043,7 @@ static int __vsock_stream_recvmsg(struct sock *sk, struct msghdr *msg,
 
 		read = transport->stream_dequeue(vsk, msg, len - copied, flags);
 		if (read < 0) {
-			err = -ENOMEM;
+			err = read;
 			break;
 		}
 
@@ -2094,7 +2094,7 @@ static int __vsock_seqpacket_recvmsg(struct sock *sk, struct msghdr *msg,
 	msg_len = transport->seqpacket_dequeue(vsk, msg, flags);
 
 	if (msg_len < 0) {
-		err = -ENOMEM;
+		err = msg_len;
 		goto out;
 	}
 
-- 
2.25.1

Re: [RFC PATCH v2 1/3] vsock: return errors other than -ENOMEM to socket

[Stefano Garzarella]

On Thu, Mar 30, 2023 at 10:05:45AM +0300, Arseniy Krasnov wrote:
>This removes behaviour, where error code returned from any transport
>was always switched to ENOMEM. This works in the same way as:
>commit
>c43170b7e157 ("vsock: return errors other than -ENOMEM to socket"),
>but for receive calls.
>
>Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
>---
> net/vmw_vsock/af_vsock.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)

We should first make sure that all transports return the right value,
and then expose it to the user, so I would move this patch, after
patch 2.

Thanks,
Stefano

>
>diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
>index 5f2dda35c980..413407bb646c 100644
>--- a/net/vmw_vsock/af_vsock.c
>+++ b/net/vmw_vsock/af_vsock.c
>@@ -2043,7 +2043,7 @@ static int __vsock_stream_recvmsg(struct sock *sk, struct msghdr *msg,
>
> 		read = transport->stream_dequeue(vsk, msg, len - copied, flags);
> 		if (read < 0) {
>-			err = -ENOMEM;
>+			err = read;
> 			break;
> 		}
>
>@@ -2094,7 +2094,7 @@ static int __vsock_seqpacket_recvmsg(struct sock *sk, struct msghdr *msg,
> 	msg_len = transport->seqpacket_dequeue(vsk, msg, flags);
>
> 	if (msg_len < 0) {
>-		err = -ENOMEM;
>+		err = msg_len;
> 		goto out;
> 	}
>
>-- 
>2.25.1
>

Re: [RFC PATCH v2 1/3] vsock: return errors other than -ENOMEM to socket

[Arseniy Krasnov]

On 30.03.2023 11:02, Stefano Garzarella wrote:
> On Thu, Mar 30, 2023 at 10:05:45AM +0300, Arseniy Krasnov wrote:
>> This removes behaviour, where error code returned from any transport
>> was always switched to ENOMEM. This works in the same way as:
>> commit
>> c43170b7e157 ("vsock: return errors other than -ENOMEM to socket"),
>> but for receive calls.
>>
>> Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
>> ---
>> net/vmw_vsock/af_vsock.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
> 
> We should first make sure that all transports return the right value,
> and then expose it to the user, so I would move this patch, after
> patch 2.

Yes, right! I'll reorder patches and fix VMCI patch after reply from @Vishnu

Thanks, Arseniy

> 
> Thanks,
> Stefano
> 
>>
>> diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
>> index 5f2dda35c980..413407bb646c 100644
>> --- a/net/vmw_vsock/af_vsock.c
>> +++ b/net/vmw_vsock/af_vsock.c
>> @@ -2043,7 +2043,7 @@ static int __vsock_stream_recvmsg(struct sock *sk, struct msghdr *msg,
>>
>>         read = transport->stream_dequeue(vsk, msg, len - copied, flags);
>>         if (read < 0) {
>> -            err = -ENOMEM;
>> +            err = read;
>>             break;
>>         }
>>
>> @@ -2094,7 +2094,7 @@ static int __vsock_seqpacket_recvmsg(struct sock *sk, struct msghdr *msg,
>>     msg_len = transport->seqpacket_dequeue(vsk, msg, flags);
>>
>>     if (msg_len < 0) {
>> -        err = -ENOMEM;
>> +        err = msg_len;
>>         goto out;
>>     }
>>
>> -- 
>> 2.25.1
>>
> 

[RFC PATCH v2 2/3] vsock/vmci: convert VMCI error code to -ENOMEM

[Arseniy Krasnov]

This adds conversion of VMCI specific error code to general -ENOMEM. It
is needed, because af_vsock.c passes error value returned from transport
to the user.

Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
---
 net/vmw_vsock/vmci_transport.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c
index 36eb16a40745..45de3e75597f 100644
--- a/net/vmw_vsock/vmci_transport.c
+++ b/net/vmw_vsock/vmci_transport.c
@@ -1831,10 +1831,17 @@ static ssize_t vmci_transport_stream_dequeue(
 	size_t len,
 	int flags)
 {
+	int err;
+
 	if (flags & MSG_PEEK)
-		return vmci_qpair_peekv(vmci_trans(vsk)->qpair, msg, len, 0);
+		err = vmci_qpair_peekv(vmci_trans(vsk)->qpair, msg, len, 0);
 	else
-		return vmci_qpair_dequev(vmci_trans(vsk)->qpair, msg, len, 0);
+		err = vmci_qpair_dequev(vmci_trans(vsk)->qpair, msg, len, 0);
+
+	if (err < 0)
+		err = -ENOMEM;
+
+	return err;
 }
 
 static ssize_t vmci_transport_stream_enqueue(
@@ -1842,7 +1849,13 @@ static ssize_t vmci_transport_stream_enqueue(
 	struct msghdr *msg,
 	size_t len)
 {
-	return vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0);
+	int err;
+
+	err = vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0);
+	if (err < 0)
+		err = -ENOMEM;
+
+	return err;
 }
 
 static s64 vmci_transport_stream_has_data(struct vsock_sock *vsk)
-- 
2.25.1

Re: [RFC PATCH v2 2/3] vsock/vmci: convert VMCI error code to -ENOMEM

[Stefano Garzarella]

On Thu, Mar 30, 2023 at 10:07:36AM +0300, Arseniy Krasnov wrote:
>This adds conversion of VMCI specific error code to general -ENOMEM. It
>is needed, because af_vsock.c passes error value returned from transport
>to the user.
>
>Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
>---
> net/vmw_vsock/vmci_transport.c | 19 ++++++++++++++++---
> 1 file changed, 16 insertions(+), 3 deletions(-)
>
>diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c
>index 36eb16a40745..45de3e75597f 100644
>--- a/net/vmw_vsock/vmci_transport.c
>+++ b/net/vmw_vsock/vmci_transport.c
>@@ -1831,10 +1831,17 @@ static ssize_t vmci_transport_stream_dequeue(
> 	size_t len,
> 	int flags)
> {
>+	int err;

Please, use the same type returned by the function.

>+
> 	if (flags & MSG_PEEK)
>-		return vmci_qpair_peekv(vmci_trans(vsk)->qpair, msg, len, 0);
>+		err = vmci_qpair_peekv(vmci_trans(vsk)->qpair, msg, len, 0);
> 	else
>-		return vmci_qpair_dequev(vmci_trans(vsk)->qpair, msg, len, 0);
>+		err = vmci_qpair_dequev(vmci_trans(vsk)->qpair, msg, len, 0);
>+
>+	if (err < 0)
>+		err = -ENOMEM;
>+
>+	return err;
> }
>
> static ssize_t vmci_transport_stream_enqueue(
>@@ -1842,7 +1849,13 @@ static ssize_t vmci_transport_stream_enqueue(
> 	struct msghdr *msg,
> 	size_t len)
> {
>-	return vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0);
>+	int err;

Ditto.

>+
>+	err = vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0);
>+	if (err < 0)
>+		err = -ENOMEM;
>+
>+	return err;
> }

@Vishnu: should we backport the change for
vmci_transport_stream_enqueue() to stable branches?

In this case I would split this patch and I would send the
vmci_transport_stream_enqueue() change to the net branch including:

Fixes: c43170b7e157 ("vsock: return errors other than -ENOMEM to socket")

Thanks,
Stefano

Re: [RFC PATCH v2 2/3] vsock/vmci: convert VMCI error code to -ENOMEM

[Vishnu Dasa]

> On Mar 30, 2023, at 1:19 AM, Stefano Garzarella <sgarzare@redhat.com> wrote:
> 
> !! External Email
> 
> On Thu, Mar 30, 2023 at 10:07:36AM +0300, Arseniy Krasnov wrote:
>> This adds conversion of VMCI specific error code to general -ENOMEM. It
>> is needed, because af_vsock.c passes error value returned from transport
>> to the user.
>> 
>> Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
>> ---
>> net/vmw_vsock/vmci_transport.c | 19 ++++++++++++++++---
>> 1 file changed, 16 insertions(+), 3 deletions(-)
>> 
>> diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c
>> index 36eb16a40745..45de3e75597f 100644
>> --- a/net/vmw_vsock/vmci_transport.c
>> +++ b/net/vmw_vsock/vmci_transport.c
>> @@ -1831,10 +1831,17 @@ static ssize_t vmci_transport_stream_dequeue(
>>      size_t len,
>>      int flags)
>> {
>> +      int err;
> 
> Please, use the same type returned by the function.
> 
>> +
>>      if (flags & MSG_PEEK)
>> -              return vmci_qpair_peekv(vmci_trans(vsk)->qpair, msg, len, 0);
>> +              err = vmci_qpair_peekv(vmci_trans(vsk)->qpair, msg, len, 0);
>>      else
>> -              return vmci_qpair_dequev(vmci_trans(vsk)->qpair, msg, len, 0);
>> +              err = vmci_qpair_dequev(vmci_trans(vsk)->qpair, msg, len, 0);
>> +
>> +      if (err < 0)
>> +              err = -ENOMEM;
>> +
>> +      return err;
>> }
>> 
>> static ssize_t vmci_transport_stream_enqueue(
>> @@ -1842,7 +1849,13 @@ static ssize_t vmci_transport_stream_enqueue(
>>      struct msghdr *msg,
>>      size_t len)
>> {
>> -      return vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0);
>> +      int err;
> 
> Ditto.
> 
>> +
>> +      err = vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0);
>> +      if (err < 0)
>> +              err = -ENOMEM;
>> +
>> +      return err;
>> }
> 
> @Vishnu: should we backport the change for
> vmci_transport_stream_enqueue() to stable branches?
> 
> In this case I would split this patch and I would send the
> vmci_transport_stream_enqueue() change to the net branch including:
> 
> Fixes: c43170b7e157 ("vsock: return errors other than -ENOMEM to socket")

Yes, good point.  It would be better to do it this way for correctness.

Thanks,
Vishnu

> 
> Thanks,
> Stefano
> 
> 
> !! External Email: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender.

[RFC PATCH v2 3/3] vsock/test: update expected return values

[Arseniy Krasnov]

This updates expected return values for invalid buffer test. Now such
values are returned from transport, not from af_vsock.c.

Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
---
 tools/testing/vsock/vsock_test.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
index 3de10dbb50f5..a91d0ef963be 100644
--- a/tools/testing/vsock/vsock_test.c
+++ b/tools/testing/vsock/vsock_test.c
@@ -723,7 +723,7 @@ static void test_seqpacket_invalid_rec_buffer_server(const struct test_opts *opt
 		exit(EXIT_FAILURE);
 	}
 
-	if (errno != ENOMEM) {
+	if (errno != EFAULT) {
 		perror("unexpected errno of 'broken_buf'");
 		exit(EXIT_FAILURE);
 	}
@@ -887,7 +887,7 @@ static void test_inv_buf_client(const struct test_opts *opts, bool stream)
 		exit(EXIT_FAILURE);
 	}
 
-	if (errno != ENOMEM) {
+	if (errno != EFAULT) {
 		fprintf(stderr, "unexpected recv(2) errno %d\n", errno);
 		exit(EXIT_FAILURE);
 	}
-- 
2.25.1