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vsock: read from socket's error queue

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[ Upstream commit 49dbe25adac42d3e06f65d1420946bec65896222 ]

This adds handling of MSG_ERRQUEUE input flag in receive call. This flag
is used to read socket's error queue instead of data queue. Possible
scenario of error queue usage is receiving completions for transmission
with MSG_ZEROCOPY flag. This patch also adds new defines: 'SOL_VSOCK'
and 'VSOCK_RECVERR'.

Signed-off-by: Arseniy Krasnov <avkrasnov@salutedevices.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Arseniy Krasnov
2023-10-10 22:15:14 +03:00
committed by Greg Kroah-Hartman
parent 0570c9fd16
commit d55a40a6fb
3 changed files with 24 additions and 0 deletions
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17
include/uapi/linux/vm_sockets.h
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@@ -191,4 +191,21 @@ struct sockaddr_vm {
#define IOCTL_VM_SOCKETS_GET_LOCAL_CID _IO(7, 0xb9)
/* MSG_ZEROCOPY notifications are encoded in the standard error format,
* sock_extended_err. See Documentation/networking/msg_zerocopy.rst in
* kernel source tree for more details.
*/
/* 'cmsg_level' field value of 'struct cmsghdr' for notification parsing
* when MSG_ZEROCOPY flag is used on transmissions.
*/
#define SOL_VSOCK 287
/* 'cmsg_type' field value of 'struct cmsghdr' for notification parsing
* when MSG_ZEROCOPY flag is used on transmissions.
*/
#define VSOCK_RECVERR 1
#endif /* _UAPI_VM_SOCKETS_H */