[dpdk-dev] [PATCH v11 0/9] vhost: support inflight share memory protocol feature

[Jin Yu <jin.yu@intel.com>]

v2:
- specify the APIs are split-ring only

v3:
- fix APIs issues and judge split or packed

v4:
- add rte_vhost_ prefix and fix issues

v5:
- add the packed ring support and add the vhost_blk example

v6:
- revise get_vring_base func depend on Tiwei's suggestion

v7:
- divide patch into small patches

v8:
- updated base on Maxime's comments

v9:
- updated base on Tiwei's comments

v10:
- fix code style and update some misleading log

v11:
- add the version log to cover letter

This patches introduces two new messages VHOST_USER_GET_INFLIGHT_FD and VHOST_USER_SET_INFLIGHT_FD to support transferring a shared buffer between qemu and backend.
Now It can both support split and packed ring. The example code show how these API work. The test has passed.

How to test the example:
1, Qemu need two patches.
https://patchwork.kernel.org/patch/10766813/
https://patchwork.kernel.org/patch/10861411/(QEMU merged) it also needs some manual modifications:
we should confirm that before we send get inflight we have already sent the set features but it seems Qemu didn't do like this. So we manually revise this, we can add below code in vhost_dev_get_inflight
    int r;

    r = vhost_dev_set_features(dev, dev->log_enabled);
    if (r < 0) {
        return -errno;
    }
before get_inflight_fd.
2, Guest OS version >= 5.0
3, run the example
4, run the qemu with vhost-user-blk-pci.
 eg:
        -chardev socket,id=spdk_vhost_blk0,reconnect=1,path=xxxx\
        -device vhost-user-blk-pci,ring_packed=on,chardev=spdk_vhost_blk0,num-queues=1\
5, run fio in the guest
6, kill the example and run again.
7, the fio in the guest should continue run without errors.


Jin Yu (9):
  vhost: add the inflight description
  vhost: add packed ring
  vhost: add the inflight structure
  vhost: add two new messages to support a shared buffer
  vhost: checkout the resubmit inflight information
  vhost: add the APIs to operate inflight ring
  vhost: add APIs for user getting inflight ring
  vhost: add vring functions packed ring support
  vhost: add vhost-user-blk example which support inflight

 examples/vhost_blk/Makefile            |   68 ++
 examples/vhost_blk/blk.c               |  125 +++
 examples/vhost_blk/blk_spec.h          |   95 +++
 examples/vhost_blk/meson.build         |   21 +
 examples/vhost_blk/vhost_blk.c         | 1092 ++++++++++++++++++++++++
 examples/vhost_blk/vhost_blk.h         |  128 +++
 examples/vhost_blk/vhost_blk_compat.c  |  195 +++++
 lib/librte_vhost/rte_vhost.h           |  237 ++++-
 lib/librte_vhost/rte_vhost_version.map |    8 +
 lib/librte_vhost/vhost.c               |  407 ++++++++-
 lib/librte_vhost/vhost.h               |   16 +
 lib/librte_vhost/vhost_user.c          |  456 +++++++++-
 lib/librte_vhost/vhost_user.h          |   12 +-
 13 files changed, 2847 insertions(+), 13 deletions(-)
 create mode 100644 examples/vhost_blk/Makefile
 create mode 100644 examples/vhost_blk/blk.c
 create mode 100644 examples/vhost_blk/blk_spec.h
 create mode 100644 examples/vhost_blk/meson.build
 create mode 100644 examples/vhost_blk/vhost_blk.c
 create mode 100644 examples/vhost_blk/vhost_blk.h
 create mode 100644 examples/vhost_blk/vhost_blk_compat.c

-- 
2.17.2