[PATCH net-next v5 0/3] net/sched: sch_fq_pie: add per-flow class statistics

[Hemendra M. Naik]

FQ-PIE runs an independent PIE controller per flow but exposes no
per-flow statistics. This series wires up fq_pie_class_ops to expose
per-flow AQM state (prob, delay, deficit, avg_dq_rate)
via 'tc -s class show', following a similar pattern as FQ-CoDel.
---
Changelog:

v5:
- Addressed Sashiko review comments:
 - Omitted .tcf_block / .bind_tcf / .unbind_tcf from cl_ops (statistics
   only being exported; filter attach to fq_pie is now disabled).
 - Dropped empty tc_fq_pie_xqd_stats placeholder; class_stats is a direct
   struct member.
 - Limited flows to [1..65535] so per-flow class handles fit in a 16-bit
   TC minor.
 - Rewrote selftest 83c0 with TBF + fq_pie, ping traffic, and
   matchCount 1 on per-flow stats output.
 - Updated selftest 83be for the new flows limit.
 - Dropped the tools/include UAPI mirror changes from patch 3/3.

v4: https://lore.kernel.org/netdev/20260727164056.106203-1-hemendranaik@xxxxxxxxx/
- Fixed unaligned commit message; moved typo fixes to another patch.

v3: https://lore.kernel.org/netdev/20260630183702.170798-1-hemendranaik@xxxxxxxxx/
- No changes since v2.
- Resent after the previous submission was deferred due to the
  net-next tree closing during review.
- Updated corresponding iproute2 patch in response to review comments;
  kernel patches unchanged.

v2: https://lore.kernel.org/netdev/20260614125000.6058-1-hemendranaik@xxxxxxxxx/
- Addressed ABI backward compatibility issue for tc_fq_pie_xstats.

v1: https://lore.kernel.org/netdev/20260531125314.22492-1-hemendranaik@xxxxxxxxx/
- Initial submission

Hemendra M. Naik (3):
  net/sched: sch_fq_pie: add per-flow statistics via class ops
  selftests: tc-testing: add fq_pie per-flow class stats test
  net/sched: pie: correct tc_pie_xstats field documentation

 include/uapi/linux/pkt_sched.h                | 23 ++++-
 net/sched/sch_fq_pie.c                        | 90 ++++++++++++++++++-
 .../tc-testing/tc-tests/qdiscs/fq_pie.json    | 33 ++++++-
 3 files changed, 138 insertions(+), 8 deletions(-)

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2.34.1