The following four patch series adds support to read vendor statistics
for a vdpa device.

The first patch is just a cleanup fix.
The second patch lays the ground to allow an upstream driver to provide
statistics in the form of an attribute name/attribute value pairs.

The makes changes to locking scheme to use readers/writers semaphore
instead if mutex.

The forth patch implements this for mlx5_vdpa which gives received
descriptors and completed descriptors information for all the
virtqueues. 

v5 -> v6:
1. Move negotiated features insertion from mlx5 into vdpa core.
2. Include the patch that changes the lock in this series.


Eli Cohen (4):
  vdpa: Fix error logic in vdpa_nl_cmd_dev_get_doit
  vdpa: Add support for querying vendor statistics
  net/vdpa: Use readers/writers semaphore instead of mutex
  vdpa/mlx5: Add support for reading descriptor statistics

 drivers/vdpa/mlx5/core/mlx5_vdpa.h |   2 +
 drivers/vdpa/mlx5/net/mlx5_vnet.c  | 155 ++++++++++++++++++++
 drivers/vdpa/vdpa.c                | 222 ++++++++++++++++++++++++-----
 include/linux/mlx5/mlx5_ifc.h      |   1 +
 include/linux/mlx5/mlx5_ifc_vdpa.h |  39 +++++
 include/linux/vdpa.h               |   3 +
 include/uapi/linux/vdpa.h          |   6 +
 7 files changed, 396 insertions(+), 32 deletions(-)

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2.35.1