在 2021/6/10 上午7:24, Jiang Wang 写道:
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.
What's the use case for the datagram vsock?
The virtio spec patch is here: https://www.spinics.net/lists/linux-virtualization/msg50027.html
Have a quick glance, I suggest to split mergeable rx buffer into an separate patch.
But I think it's time to revisit the idea of unifying the virtio-net and virtio-vsock. Otherwise we're duplicating features and bugs.
Thanks
For those who prefer git repo, here is the link for the linux kernel： https://github.com/Jiang1155/linux/tree/vsock-dgram-v1 qemu patch link: https://github.com/Jiang1155/qemu/tree/vsock-dgram-v1 To do: 1. use skb when receiving packets 2. support multiple transport 3. support mergeable rx buffer Jiang Wang (6): 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 vhost/vsock: add kconfig for vhost dgram support virtio/vsock: add sysfs for rx buf len for dgram drivers/vhost/Kconfig | 8 + drivers/vhost/vsock.c | 207 ++++++++-- include/linux/virtio_vsock.h | 9 + include/net/af_vsock.h | 1 + .../trace/events/vsock_virtio_transport_common.h | 5 +- include/uapi/linux/virtio_vsock.h | 4 + net/vmw_vsock/af_vsock.c | 12 + net/vmw_vsock/virtio_transport.c | 433 ++++++++++++++++++--- net/vmw_vsock/virtio_transport_common.c | 184 ++++++++- tools/testing/vsock/util.c | 105 +++++ tools/testing/vsock/util.h | 4 + tools/testing/vsock/vsock_test.c | 195 ++++++++++ 12 files changed, 1070 insertions(+), 97 deletions(-)
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