This patchset implements support of SOCK_DGRAM for virtio transport. Datagram sockets are connectionless and unreliable. To avoid unfair contention with stream and other sockets, add two more virtqueues and a new feature bit to indicate if those two new queues exist or not.
Dgram does not use the existing credit update mechanism for stream sockets. When sending from the guest/driver, sending packets synchronously, so the sender will get an error when the virtqueue is full. When sending from the host/device, send packets asynchronously because the descriptor memory belongs to the corresponding QEMU process. The virtio spec patch is here: https://www.mail-archive.com/virtualization@lists.linux-foundation.org/msg47457.html For those who prefer git repo, here is the link for the linux kernel： https://github.com/Jiang1155/linux/tree/vsock-dgram-v2 qemu patch link: https://lists.gnu.org/archive/html/qemu-devel/2021-09/msg03462.html To do: 1. use skb when receiving packets 2. support multiple transport 3. support mergeable rx buffer 4. support disabling F_STREAM feature bit v1 -> v2 : - fix migration bug in vhost-vsock - rename some variables - clean up some code in virtio-vsock - use le_to_cpu16 in virtio-vsock Jiang Wang (5): virtio/vsock: add VIRTIO_VSOCK_F_DGRAM feature bit virtio/vsock: add support for virtio datagram vhost/vsock: add support for vhost dgram. vsock_test: add tests for vsock dgram virtio/vsock: add sysfs for rx buf len for dgram drivers/vhost/vsock.c | 220 +++++++-- include/linux/virtio_vsock.h | 9 + include/net/af_vsock.h | 1 + .../events/vsock_virtio_transport_common.h | 2 + include/uapi/linux/virtio_vsock.h | 3 + net/vmw_vsock/af_vsock.c | 12 + net/vmw_vsock/virtio_transport.c | 463 +++++++++++++++--- net/vmw_vsock/virtio_transport_common.c | 181 ++++++- tools/testing/vsock/util.c | 105 ++++ tools/testing/vsock/util.h | 4 + tools/testing/vsock/vsock_test.c | 195 ++++++++ 11 files changed, 1083 insertions(+), 112 deletions(-) -- 2.20.1 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
