[PATCH v5 0/1] net/mana: add device reset support

[Wei Hu <weh@linux.microsoft.com>]

From: Wei Hu <weh@microsoft.com>

Add support for handling hardware service reset events in the
MANA driver. When the MANA kernel driver receives a hardware
service event, it initiates a device reset and notifies userspace
via IBV_EVENT_DEVICE_FATAL. The MANA PMD handles this by
performing an automatic teardown and recovery sequence.

The driver uses ethdev recovery events (ERR_RECOVERING,
RECOVERY_SUCCESS, RECOVERY_FAILED) to notify upper layers of
the reset lifecycle, and a PCI device removal event callback
to distinguish hot-remove from service reset.

Changes since v4:
- Fixed stale rte_spinlock_unlock call in mana_intr_handler that
  was missed during the spinlock-to-mutex conversion, causing a
  -Wincompatible-pointer-types warning

Changes since v3:
- Converted reset_ops_lock from rte_spinlock_t to pthread_mutex_t
  with PTHREAD_PROCESS_SHARED, since the lock is held across
  blocking IB verbs calls and IPC with 5s timeout
- Removed rte_dev_event_callback_unregister retry loop to avoid
  deadlock: the callback itself blocks on reset_ops_lock, so
  retrying on -EAGAIN while holding the lock is a deadlock
- Introduced mana_join_reset_thread() helper using CAS on
  reset_thread_active to prevent double-join undefined behavior
- Added reset thread join in mana_dev_uninit to prevent thread
  leak on device removal
- Fixed ibv handle leak: priv->ib_ctx is now only set to NULL
  after ibv_close_device succeeds
- Fixed misleading "All secondary threads are quiescent" log in
  mana_mp_reset_enter — changed to "Secondary doorbell pages
  unmapped" since actual quiescence is enforced by the primary's
  RCU QSBR check before IPC is sent
- Changed event list in mana.rst to RST definition list style
- Squashed documentation into the feature patch per convention

Changes since v2:
- Fixed dev_state_qsv memory leak on device removal
- Fixed reset thread TCB/stack leak: reset_thread_active is now
  only cleared by the joiner, not the thread itself
- Fixed second reset crash: removed reset thread join logic from
  mana_dev_close (inner function) to avoid corrupting dev_state
  when called from mana_reset_enter
- Made reset_thread_active RTE_ATOMIC(bool) with explicit ordering
- Added retry loop for rte_dev_event_callback_unregister on -EAGAIN
- Initialized condvar/mutex with PTHREAD_PROCESS_SHARED since priv
  is in hugepage shared memory
- Added re-check of dev_state after lock acquisition in
  mana_intr_handler to prevent racing with pci_remove_event_cb
- Replaced (void *)0 with NULL in mp.c
- Added lock ownership comment block at mana_reset_enter
- Documented rte_dev_event_monitor_start() requirement
- Added mana.rst documentation and release note

Changes since v1:
- Removed net/netvsc patch from this series
- Simplified reset exit: mana_reset_exit calls
  mana_reset_exit_delay directly instead of spawning a thread
- Added __rte_no_thread_safety_analysis annotations for clang
- Switched to rte_thread_create_internal_control
- Fixed declaration-after-statement style issues
- Removed unnecessary blank lines and stale comments

Wei Hu (1):
  net/mana: add device reset support

 doc/guides/nics/mana.rst               |   38 +
 doc/guides/rel_notes/release_26_07.rst |    8 +
 drivers/net/mana/mana.c                | 1005 ++++++++++++++++++++++--
 drivers/net/mana/mana.h                |   33 +-
 drivers/net/mana/meson.build           |    2 +-
 drivers/net/mana/mp.c                  |   89 ++-
 drivers/net/mana/mr.c                  |    6 +-
 drivers/net/mana/rx.c                  |   24 +-
 drivers/net/mana/tx.c                  |   40 +-
 9 files changed, 1138 insertions(+), 107 deletions(-)

-- 
2.34.1