[PATCH v3 0/8] Reduce reliance on global response buffer in IAVF

[Anatoly Burakov <anatoly.burakov@intel.com>]

In many places where we are calling down into virtchnl, we are using a
globally allocated adminq response buffer. This is unnecessary, so replace
with adminq buffers allocated on stack. However, because IAVF virtchnl
message queue works asynchronously in most cases, we can't remove the
global buffer entirely, and we need to do some cleanup and refactoring to
be able to reduce our usage of these buffers. This patchset does that.

v1 -> v2:
- Stats query was passing in a pointer-to-pointer and storing pointer to
  global adminq response buffer as output parameter, so changing that to a
  local buffer resulted in storing a pointer to a buffer that was stack
  allocated (i.e. introduced a use-after-free).

v2 -> v3:
- Reworked the virtchnl message handling to not rely on implicit behavior
- Split up into 8 patches for easy review

Anatoly Burakov (8):
  net/iavf: avoid passing around pointers
  net/iavf: add a variable for hena
  net/iavf: add virtchnl interrupt enable flag
  net/iavf: rework "async" virtchnl requests
  net/iavf: refactor sending virtchnl messages
  net/iavf: respect output buffer in virtchnl
  net/iavf: do not use global virtchnl buffer
  net/iavf: embed virtchnl response buffer

 drivers/net/intel/iavf/iavf.h        |  58 +---
 drivers/net/intel/iavf/iavf_ethdev.c |  50 ++-
 drivers/net/intel/iavf/iavf_vchnl.c  | 483 ++++++++++++++++-----------
 3 files changed, 304 insertions(+), 287 deletions(-)

-- 
2.47.3