[PATCH RFC 0/3] vsock: add support for sockmap

[Bobby Eshleman]

Add support for sockmap to vsock.

We're testing usage of vsock as a way to redirect guest-local UDS requests to
the host and this patch series greatly improves the performance of such a
setup.

Compared to copying packets via userspace, this improves throughput by 221% in
basic testing.

Tested as follows.

Setup: guest unix dgram sender -> guest vsock redirector -> host vsock server
Threads: 1
Payload: 64k
No sockmap:
- 76.3 MB/s
- The guest vsock redirector was
  "socat VSOCK-CONNECT:2:1234 UNIX-RECV:/path/to/sock"
Using sockmap (this patch):
- 168.8 MB/s (+221%)
- The guest redirector was a simple sockmap echo server,
  redirecting unix ingress to vsock 2:1234 egress.
- Same sender and server programs

Only the virtio transport has been tested. The loopback transport was used in
writing bpf/selftests, but not thoroughly tested otherwise.

This series requires the skb patch.

To: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
To: Stefano Garzarella <sgarzare@xxxxxxxxxx>
To: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
To: Jason Wang <jasowang@xxxxxxxxxx>
To: "David S. Miller" <davem@xxxxxxxxxxxxx>
To: Eric Dumazet <edumazet@xxxxxxxxxx>
To: Jakub Kicinski <kuba@xxxxxxxxxx>
To: Paolo Abeni <pabeni@xxxxxxxxxx>
To: Andrii Nakryiko <andrii@xxxxxxxxxx>
To: Mykola Lysenko <mykolal@xxxxxx>
To: Alexei Starovoitov <ast@xxxxxxxxxx>
To: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
To: Martin KaFai Lau <martin.lau@xxxxxxxxx>
To: Song Liu <song@xxxxxxxxxx>
To: Yonghong Song <yhs@xxxxxx>
To: John Fastabend <john.fastabend@xxxxxxxxx>
To: KP Singh <kpsingh@xxxxxxxxxx>
To: Stanislav Fomichev <sdf@xxxxxxxxxx>
To: Hao Luo <haoluo@xxxxxxxxxx>
To: Jiri Olsa <jolsa@xxxxxxxxxx>
To: Shuah Khan <shuah@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx
Cc: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: netdev@xxxxxxxxxxxxxxx
Cc: bpf@xxxxxxxxxxxxxxx
Cc: linux-kselftest@xxxxxxxxxxxxxxx
Signed-off-by: Bobby Eshleman <bobby.eshleman@xxxxxxxxxxxxx>

---
Bobby Eshleman (3):
      vsock: support sockmap
      selftests/bpf: add vsock to vmtest.sh
      selftests/bpf: Add a test case for vsock sockmap

 drivers/vhost/vsock.c                              |   1 +
 include/linux/virtio_vsock.h                       |   1 +
 include/net/af_vsock.h                             |  17 ++
 net/vmw_vsock/Makefile                             |   1 +
 net/vmw_vsock/af_vsock.c                           |  59 ++++++-
 net/vmw_vsock/virtio_transport.c                   |   2 +
 net/vmw_vsock/virtio_transport_common.c            |  22 +++
 net/vmw_vsock/vsock_bpf.c                          | 180 +++++++++++++++++++++
 net/vmw_vsock/vsock_loopback.c                     |   2 +
 tools/testing/selftests/bpf/config.x86_64          |   4 +
 .../selftests/bpf/prog_tests/sockmap_listen.c      | 163 +++++++++++++++++++
 tools/testing/selftests/bpf/vmtest.sh              |   1 +
 12 files changed, 447 insertions(+), 6 deletions(-)
---
base-commit: f12f4326c6a75a74e908714be6d2f0e2f0fd0d76
change-id: 20230118-support-vsock-sockmap-connectible-2e1297d2111a

Best regards,
-- 
Bobby Eshleman <bobby.eshleman@xxxxxxxxxxxxx>