[PATCH net-next v4 00/12] vsock/virtio: continue MSG_ZEROCOPY support

[Arseniy Krasnov]

Hello,

this patchset contains second and third parts of another big patchset
for MSG_ZEROCOPY flag support:
https://lore.kernel.org/netdev/20230701063947.3422088-1-AVKrasnov@xxxxxxxxxxxxxx/

During review of this series, Stefano Garzarella <sgarzare@xxxxxxxxxx>
suggested to split it for three parts to simplify review and merging:

1) virtio and vhost updates (for fragged skbs) (merged to net-next, see
   link below)
2) AF_VSOCK updates (allows to enable MSG_ZEROCOPY mode and read
   tx completions) and update for Documentation/. <-- this patchset
3) Updates for tests and utils. <-- this patchset

Part 1) was merged:
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=71b263e79370348349553ecdf46f4a69eb436dc7

Head for this patchset is:
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=19537e125cc7cf2da43a606f5bcebbe0c9aea4cc

Link to v1:
https://lore.kernel.org/netdev/20230922052428.4005676-1-avkrasnov@xxxxxxxxxxxxxxxxx/
Link to v2:
https://lore.kernel.org/netdev/20230930210308.2394919-1-avkrasnov@xxxxxxxxxxxxxxxxx/
Link to v3:
https://lore.kernel.org/netdev/20231007172139.1338644-1-avkrasnov@xxxxxxxxxxxxxxxxx/

Changelog:                                                              
 v1 -> v2:                                                              
 * Patchset rebased and tested on new HEAD of net-next (see hash above).
 * See per-patch changelog after ---. 
 v2 -> v3:                                                              
 * Patchset rebased and tested on new HEAD of net-next (see hash above).
 * See per-patch changelog after ---. 
 v3 -> v4:                                                              
 * Patchset rebased and tested on new HEAD of net-next (see hash above).
 * See per-patch changelog after ---. 

Arseniy Krasnov (12):
  vsock: set EPOLLERR on non-empty error queue
  vsock: read from socket's error queue
  vsock: check for MSG_ZEROCOPY support on send
  vsock: enable SOCK_SUPPORT_ZC bit
  vhost/vsock: support MSG_ZEROCOPY for transport
  vsock/virtio: support MSG_ZEROCOPY for transport
  vsock/loopback: support MSG_ZEROCOPY for transport
  vsock: enable setting SO_ZEROCOPY
  docs: net: description of MSG_ZEROCOPY for AF_VSOCK
  test/vsock: MSG_ZEROCOPY flag tests
  test/vsock: MSG_ZEROCOPY support for vsock_perf
  test/vsock: io_uring rx/tx tests

 Documentation/networking/msg_zerocopy.rst |  13 +-
 drivers/vhost/vsock.c                     |   7 +
 include/linux/socket.h                    |   1 +
 include/net/af_vsock.h                    |   7 +
 include/uapi/linux/vm_sockets.h           |  17 +
 net/vmw_vsock/af_vsock.c                  |  63 +++-
 net/vmw_vsock/virtio_transport.c          |   7 +
 net/vmw_vsock/vsock_loopback.c            |   6 +
 tools/testing/vsock/.gitignore            |   1 +
 tools/testing/vsock/Makefile              |  11 +-
 tools/testing/vsock/msg_zerocopy_common.c |  87 ++++++
 tools/testing/vsock/msg_zerocopy_common.h |  18 ++
 tools/testing/vsock/util.c                | 133 ++++++++
 tools/testing/vsock/util.h                |   5 +
 tools/testing/vsock/vsock_perf.c          |  80 ++++-
 tools/testing/vsock/vsock_test.c          |  16 +
 tools/testing/vsock/vsock_test_zerocopy.c | 358 ++++++++++++++++++++++
 tools/testing/vsock/vsock_test_zerocopy.h |  15 +
 tools/testing/vsock/vsock_uring_test.c    | 342 +++++++++++++++++++++
 19 files changed, 1170 insertions(+), 17 deletions(-)
 create mode 100644 tools/testing/vsock/msg_zerocopy_common.c
 create mode 100644 tools/testing/vsock/msg_zerocopy_common.h
 create mode 100644 tools/testing/vsock/vsock_test_zerocopy.c
 create mode 100644 tools/testing/vsock/vsock_test_zerocopy.h
 create mode 100644 tools/testing/vsock/vsock_uring_test.c

-- 
2.25.1