[PATCH 6.6 214/299] IB/mlx5: Dont expose debugfs entries for RRoCE general parameters if not supported

Greg Kroah-Hartman
2024-02-27T13:57:03Z

From: Mark Zhang <markzhang@nvidia.com>

[ Upstream commit 43fdbd140238d44e7e847232719fef7d20f9d326 ]

debugfs entries for RRoCE general CC parameters must be exposed only when
they are supported, otherwise when accessing them there may be a syndrome
error in kernel log, for example:

$ cat /sys/kernel/debug/mlx5/0000:08:00.1/cc_params/rtt_resp_dscp
cat: '/sys/kernel/debug/mlx5/0000:08:00.1/cc_params/rtt_resp_dscp': Invalid argument
$ dmesg
mlx5_core 0000:08:00.1: mlx5_cmd_out_err:805:(pid 1253): QUERY_CONG_PARAMS(0x824) op_mod(0x0) failed, status bad parameter(0x3), syndrome (0x325a82), err(-22)

Fixes: 66fb1d5df6ac ("IB/mlx5: Extend debug control for CC parameters")
Reviewed-by: Edward Srouji <edwards@nvidia.com>
Signed-off-by: Mark Zhang <markzhang@nvidia.com>
Link: https://lore.kernel.org/r/e7ade70bad52b7468bdb1de4d41d5fad70c8b71c.1706433934.git.leon@kernel.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/infiniband/hw/mlx5/cong.c | 6 ++++++
include/linux/mlx5/mlx5_ifc.h | 2 +-
2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/mlx5/cong.c b/drivers/infiniband/hw/mlx5/cong.c
index f87531318feb8..a78a067e3ce7f 100644
--- a/drivers/infiniband/hw/mlx5/cong.c
+++ b/drivers/infiniband/hw/mlx5/cong.c
@@ -458,6 +458,12 @@ void mlx5_ib_init_cong_debugfs(struct mlx5_ib_dev *dev, u32 port_num)
dbg_cc_params->root = debugfs_create_dir("cc_params", mlx5_debugfs_get_dev_root(mdev));

for (i = 0; i < MLX5_IB_DBG_CC_MAX; i++) {
+ if ((i == MLX5_IB_DBG_CC_GENERAL_RTT_RESP_DSCP_VALID ||
+ i == MLX5_IB_DBG_CC_GENERAL_RTT_RESP_DSCP))
+ if (!MLX5_CAP_GEN(mdev, roce) ||
+ !MLX5_CAP_ROCE(mdev, roce_cc_general))
+ continue;
+
dbg_cc_params->params[i].offset = i;
dbg_cc_params->params[i].dev = dev;
dbg_cc_params->params[i].port_num = port_num;
diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index 51eb83f779388..643e9ba4e64bd 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -1102,7 +1102,7 @@ struct mlx5_ifc_roce_cap_bits {
u8 sw_r_roce_src_udp_port[0x1];
u8 fl_rc_qp_when_roce_disabled[0x1];
u8 fl_rc_qp_when_roce_enabled[0x1];
- u8 reserved_at_7[0x1];
+ u8 roce_cc_general[0x1];
u8 qp_ooo_transmit_default[0x1];
u8 reserved_at_9[0x15];
u8 qp_ts_format[0x2];
--
2.43.0