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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