[PATCH v3 0/6] net/gve: add hardware timestamping support

[Mark Blasko <blasko@google.com>]

This patch series introduces support for GVE hardware timestamping on DQO
queues. To support concurrent access, a mutex lock is introduced to protect
admin queue operations. A mechanism is then added to periodically synchronize
the NIC clock via AdminQ, and support is introduced for the read_clock ethdev
operation. Finally, the RX datapath is updated to reconstruct full 64-bit
timestamps from the 32-bit values in DQO descriptors.

---
v3:
- Patch 5:
  - Add mutex lock to protect shared NIC timestamp memzone access.
  - Fix missing read_clock assignment to DQO queue ops table
    (accidental omission in v2).

v2:
- Patch 1: Dropped ROBUST mutex attribute.
- Patch 3: Added adminq timestamp counter reset to gve_adminq_alloc.
- Patch 4:
  - Removed redundant void* casts.
  - Handled alarm reschedule failures by marking timestamp stale.
  - Added transient error logging on memzone allocation failure.
- Patch 5: Scoped read_clock ethdev operation strictly to DQO queues.
- Patch 6:
  - Scoped timestamp offload capability advertisement strictly to
    DQO queues.
  - Predicated capability advertisement directly on memzone
    allocation.
  - Initialized mbuf_timestamp_offset to -1.
  - Added blank line separating release notes.
---

Mark Blasko (6):
  net/gve: add thread safety to admin queue
  net/gve: add device option support for HW timestamps
  net/gve: add AdminQ command for NIC timestamps
  net/gve: add periodic NIC clock synchronization
  net/gve: support read clock ethdev op
  net/gve: reconstruct HW timestamps from DQO

 .mailmap                               |   1 +
 doc/guides/nics/features/gve.ini       |   1 +
 doc/guides/nics/gve.rst                |  20 ++++
 doc/guides/rel_notes/release_26_07.rst |   4 +
 drivers/net/gve/base/gve_adminq.c      | 128 +++++++++++++++++---
 drivers/net/gve/base/gve_adminq.h      |  29 +++++
 drivers/net/gve/base/gve_desc_dqo.h    |   8 +-
 drivers/net/gve/gve_ethdev.c           | 159 ++++++++++++++++++++++++-
 drivers/net/gve/gve_ethdev.h           |  40 +++++++
 drivers/net/gve/gve_rx_dqo.c           |  26 ++++
 10 files changed, 394 insertions(+), 22 deletions(-)

-- 
2.54.0.1032.g2f8565e1d1-goog