netdev - Re: [net-next 07/15] net/mlx5: SD, Add informative prints in kernel log

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Date: Thu, 25 Jan 2024 09:42:41 +0200
From: Tariq Toukan <ttoukan.linux@...il.com>
To: Jiri Pirko <jiri@...nulli.us>, Saeed Mahameed <saeed@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski
 <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Eric Dumazet <edumazet@...gle.com>, Saeed Mahameed <saeedm@...dia.com>,
 netdev@...r.kernel.org, Tariq Toukan <tariqt@...dia.com>
Subject: Re: [net-next 07/15] net/mlx5: SD, Add informative prints in kernel
 log



On 05/01/2024 14:12, Jiri Pirko wrote:
> Thu, Dec 21, 2023 at 01:57:13AM CET, saeed@...nel.org wrote:
>> From: Tariq Toukan <tariqt@...dia.com>
>>
>> Print to kernel log when an SD group moves from/to ready state.
>>
>> Signed-off-by: Tariq Toukan <tariqt@...dia.com>
>> Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
>> ---
>> .../net/ethernet/mellanox/mlx5/core/lib/sd.c  | 21 +++++++++++++++++++
>> 1 file changed, 21 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
>> index 3309f21d892e..f68942277c62 100644
>> --- a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
>> @@ -373,6 +373,21 @@ static void sd_cmd_unset_secondary(struct mlx5_core_dev *secondary)
>> 	mlx5_fs_cmd_set_l2table_entry_silent(secondary, 0);
>> }
>>
>> +static void sd_print_group(struct mlx5_core_dev *primary)
>> +{
>> +	struct mlx5_sd *sd = mlx5_get_sd(primary);
>> +	struct mlx5_core_dev *pos;
>> +	int i;
>> +
>> +	sd_info(primary, "group id %#x, primary %s, vhca %u\n",
>> +		sd->group_id, pci_name(primary->pdev),
>> +		MLX5_CAP_GEN(primary, vhca_id));
>> +	mlx5_sd_for_each_secondary(i, primary, pos)
>> +		sd_info(primary, "group id %#x, secondary#%d %s, vhca %u\n",
>> +			sd->group_id, i - 1, pci_name(pos->pdev),
>> +			MLX5_CAP_GEN(pos, vhca_id));
>> +}
>> +
>> int mlx5_sd_init(struct mlx5_core_dev *dev)
>> {
>> 	struct mlx5_core_dev *primary, *pos, *to;
>> @@ -410,6 +425,10 @@ int mlx5_sd_init(struct mlx5_core_dev *dev)
>> 			goto err_unset_secondaries;
>> 	}
>>
>> +	sd_info(primary, "group id %#x, size %d, combined\n",
>> +		sd->group_id, mlx5_devcom_comp_get_size(sd->devcom));
> 
> Can't you rather expose this over sysfs or debugfs? I mean, dmesg print
> does not seem like a good idea.
> 
> 

I think that the events of netdev combine/uncombine are important enough 
to be logged in the kernel dmesg.
I can implement a debugfs as an addition, not replacing the print.

>> +	sd_print_group(primary);
>> +
>> 	return 0;
>>
>> err_unset_secondaries:
>> @@ -440,6 +459,8 @@ void mlx5_sd_cleanup(struct mlx5_core_dev *dev)
>> 	mlx5_sd_for_each_secondary(i, primary, pos)
>> 		sd_cmd_unset_secondary(pos);
>> 	sd_cmd_unset_primary(primary);
>> +
>> +	sd_info(primary, "group id %#x, uncombined\n", sd->group_id);
>> out:
>> 	sd_unregister(dev);
>> 	sd_cleanup(dev);
>> -- 
>> 2.43.0
>>
>>