[PATCH net-next v2 0/4] eth: mpnic: add basic netdev statistics

Add basic netdev statistics and report them via ndo_get_stats64 and
netdev_stat_ops.

Track per queue netdev statistics such as Tx/Rx: packets, bytes, drops,
etc. The driver keeps per-queue state for statistics that is updated
mostly from the NAPI poll and ndo_start_xmit paths. The stats are made
available through the usual driver APIs.

When the netif is transitioned down, the per-queue stat counters are
folded into a global per-device set of counters, and then when the netif
is brought back up, the per-queue counters start counting again from 0.

Extra care is needed for implementing ndo_get_stats64 since the instance
lock is not taken. When ndo_get_stats64 races against ndo_stop and
ndo_open, the reader can attempt to read per-queue stats while the queue
count is changing. To deal with this, the writer publishes the
aggregated base stats and the active queue counts in a single RCU
versioned object.

Signed-off-by: Daniel Zahka <daniel.zahka@gmail.com>
---
Changes in v2:
- eth: mpnic: count packets, bytes, and drops per ring
  - count Rx frames dropped by the driver in rx_packets and rx_bytes
  - disable BH instead of preemption around the Tx flush stats update
- Link to v1: https://lore.kernel.org/r/20261009-mpnic-counters3-v1-0-7dc7644cc500@gmail.com (local)

---
Daniel Zahka (4):
      eth: mpnic: count packets, bytes, and drops per ring
      eth: mpnic: report per-queue stats
      eth: mpnic: count Tx queue stops and wakes
      eth: mpnic: count Rx allocation failures

 drivers/net/ethernet/meta/mpnic/mpnic_netdev.c | 182 ++++++++++++++++++++++++
 drivers/net/ethernet/meta/mpnic/mpnic_netdev.h |  29 ++++
 drivers/net/ethernet/meta/mpnic/mpnic_txrx.c   | 183 ++++++++++++++++++++++---
 drivers/net/ethernet/meta/mpnic/mpnic_txrx.h   |  30 ++++
 4 files changed, 406 insertions(+), 18 deletions(-)
---
base-commit: d8674294aefef02266c4d47ad10131f1bffbe534
change-id: 20261002-mpnic-counters3-d08883b96372

Best regards,
-- 
Daniel Zahka [off-list ref]