https://github.com/torvalds/linux
Revision 74b30b3ad5cec95d2647e796d10137438a098bc1 authored by Chris Mi on 29 August 2022, 09:02:28 UTC, committed by Leon Romanovsky on 05 September 2022, 11:49:53 UTC
When accessing Ports Performance Counters Register (PPCNT),
local port must be one if it is Function-Per-Port HCA that
HCA_CAP.num_ports is 1.

The offending patch can change the local port to other values
when accessing PPCNT after enabling switchdev mode. The following
syndrome will be printed:

 # cat /sys/class/infiniband/rdmap4s0f0/ports/2/counters/*
 # dmesg
 mlx5_core 0000:04:00.0: mlx5_cmd_check:756:(pid 12450): ACCESS_REG(0x805) op_mod(0x1) failed, status bad parameter(0x3), syndrome (0x1e5585)

Fix it by setting local port to one for Function-Per-Port HCA.

Fixes: 210b1f78076f ("IB/mlx5: When not in dual port RoCE mode, use provided port as native")
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Chris Mi <cmi@nvidia.com>
Link: https://lore.kernel.org/r/6c5086c295c76211169e58dbd610fb0402360bab.1661763459.git.leonro@nvidia.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
1 parent 9ca05b0
History
Tip revision: 74b30b3ad5cec95d2647e796d10137438a098bc1 authored by Chris Mi on 29 August 2022, 09:02:28 UTC
RDMA/mlx5: Set local port to one when accessing counters
Tip revision: 74b30b3
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