FQ-PIE exposes no per-flow AQM state in userspace today. This series
adds tc support for printing per-flow statistics via
'tc -s class show', matching the kernel fq_pie class ops series.

The corresponding kernel series can be viewed here:
https://lore.kernel.org/netdev/20260902035231.81866-1-hemendranaik@gmail.com/

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Changelog:

v5:
- Addressed Sashiko review comments (folded into patch 1/3):
 - Dropped empty tc_fq_pie_xqd_stats placeholder; class_stats is now a direct
   struct member in the UAPI header.

v4: https://lore.kernel.org/netdev/20260727165028.106817-1-hemendranaik@gmail.com/
- Split into 3 patches: fq_pie class stats, pie avg_dq_rate
  formatting, and tc_pie_xstats comment fixes.

v3: https://lore.kernel.org/netdev/20260630184453.171410-1-hemendranaik@gmail.com/
- Moved print_nl() into each xstats type block to preserve output
  formatting.

v2: https://lore.kernel.org/netdev/20260614130729.10076-1-hemendranaik@gmail.com/
- Addressed ABI backward compatibility issue.

v1: https://lore.kernel.org/netdev/20260531131411.28213-1-hemendranaik@gmail.com/
- Initial submission

Hemendra M. Naik (3):
  tc: fq_pie: add support for printing per-flow PIE statistics
  tc: pie: print avg_dq_rate in human-readable format
  tc: correct tc_pie_xstats field documentation

 include/uapi/linux/pkt_sched.h | 21 ++++++++++--
 man/man8/tc-fq_pie.8           | 18 +++++++++++
 man/man8/tc-pie.8              |  2 +-
 tc/q_fq_pie.c                  | 59 +++++++++++++++++++++++-----------
 tc/q_pie.c                     |  4 +--
 5 files changed, 80 insertions(+), 24 deletions(-)

-- 
2.34.1