mirror of
https://github.com/torvalds/linux.git
synced 2026-03-08 06:24:43 +01:00
dabffd0854
MANA hardware requires at least one doorbell ring every 8 wraparounds
of the CQ. The driver rings the doorbell as a form of flow control to
inform hardware that CQEs have been consumed.
The NAPI poll functions mana_poll_tx_cq() and mana_poll_rx_cq() can
poll up to CQE_POLLING_BUFFER (512) completions per call. If the CQ
has fewer than 512 entries, a single poll call can process more than
4 wraparounds without ringing the doorbell. The doorbell threshold
check also uses ">" instead of ">=", delaying the ring by one extra
CQE beyond 4 wraparounds. Combined, these issues can cause the driver
to exceed the 8-wraparound hardware limit, leading to missed
completions and stalled queues.
Fix this by capping the number of CQEs polled per call to 4 wraparounds
of the CQ in both TX and RX paths. Also change the doorbell threshold
from ">" to ">=" so the doorbell is rung as soon as 4 wraparounds are
reached.
Cc: stable@vger.kernel.org
Fixes:
|
||
|---|---|---|
| .. | ||
| gdma_main.c | ||
| hw_channel.c | ||
| Makefile | ||
| mana_bpf.c | ||
| mana_en.c | ||
| mana_ethtool.c | ||
| shm_channel.c | ||