This patchset implements support of MSG_EOR bit for SEQPACKET AF_VSOCK sockets over virtio transport. Idea is to distinguish concepts of 'messages' and 'records'. Message is result of sending calls: 'write()', 'send()', 'sendmsg()' etc. It has fixed maximum length, and it bounds are visible using return from receive calls: 'read()', 'recv()', 'recvmsg()' etc. Current implementation based on message definition above. Record has unlimited length, it consists of multiple message, and bounds of record are visible via MSG_EOR flag returned from 'recvmsg()' call. Sender passes MSG_EOR to sending system call and receiver will see MSG_EOR when corresponding message will be processed. To support MSG_EOR new bit was added along with existing 'VIRTIO_VSOCK_SEQ_EOR': 'VIRTIO_VSOCK_SEQ_EOM'(end-of-message) - now it works in the same way as 'VIRTIO_VSOCK_SEQ_EOR'. But 'VIRTIO_VSOCK_SEQ_EOR' is used to mark 'MSG_EOR' bit passed from userspace. This patchset includes simple test for MSG_EOR. Also i've added new vsock test for '-EAGAIN' receive result. Arseny Krasnov(7): virtio/vsock: add 'VIRTIO_VSOCK_SEQ_EOM' bit vsock: rename implementation from 'record' to 'message' vhost/vsock: support MSG_EOR bit processing virito/vsock: support MSG_EOR bit processing af_vsock: rename variables in receive loop vsock_test: update message bounds test for MSG_EOR vsock_test: 'SO_RCVTIMEO' test for SEQPACKET drivers/vhost/vsock.c | 28 +++++++---- include/uapi/linux/virtio_vsock.h | 1 + net/vmw_vsock/af_vsock.c | 10 ++-- net/vmw_vsock/virtio_transport_common.c | 23 +++++---- tools/testing/vsock/vsock_test.c | 57 ++++++++++++++++++++++- 5 files changed, 96 insertions(+), 23 deletions(-) Signed-off-by: Arseny Krasnov <arseny.krasnov@xxxxxxxxxxxxx> -- 2.25.1
