From: Chris Mi cmi@nvidia.com
[ Upstream commit 74b30b3ad5cec95d2647e796d10137438a098bc1 ]
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.166176345... Signed-off-by: Leon Romanovsky leon@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/hw/mlx5/mad.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/infiniband/hw/mlx5/mad.c b/drivers/infiniband/hw/mlx5/mad.c index 293ed709e5ed5..b4dc52392275b 100644 --- a/drivers/infiniband/hw/mlx5/mad.c +++ b/drivers/infiniband/hw/mlx5/mad.c @@ -166,6 +166,12 @@ static int process_pma_cmd(struct mlx5_ib_dev *dev, u32 port_num, mdev = dev->mdev; mdev_port_num = 1; } + if (MLX5_CAP_GEN(dev->mdev, num_ports) == 1) { + /* set local port to one for Function-Per-Port HCA. */ + mdev = dev->mdev; + mdev_port_num = 1; + } + /* Declaring support of extended counters */ if (in_mad->mad_hdr.attr_id == IB_PMA_CLASS_PORT_INFO) { struct ib_class_port_info cpi = {};