linux-kernel - Re: [Intel-wired-lan] [net-next v3] intel: make module parameters readable in sys filesystem

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Message-ID: <f640ed12-3e72-481e-a2bd-4c6ccc092532@gmail.com>
Date: Wed, 14 Feb 2024 08:32:06 +0100
From: Heiner Kallweit <hkallweit1@...il.com>
To: Paul Menzel <pmenzel@...gen.mpg.de>, Jon Maxwell <jmaxwell37@...il.com>,
 jesse.brandeburg@...el.com
Cc: intel-wired-lan@...ts.osuosl.org, linux-kernel@...r.kernel.org,
 edumazet@...gle.com, anthony.l.nguyen@...el.com, netdev@...r.kernel.org,
 kuba@...nel.org, pabeni@...hat.com, davem@...emloft.net
Subject: Re: [Intel-wired-lan] [net-next v3] intel: make module parameters
 readable in sys filesystem

On 14.02.2024 08:22, Paul Menzel wrote:
> Dear Jon,
> 
> 
> Thank you very much for your patch.
> 
> Am 13.02.24 um 11:23 PM schrieb Jon Maxwell:
>> Linux users sometimes need an easy way to check current values of module
>> parameters. For example the module may be manually reloaded with different
>> parameters. Make these visible and readable in the /sys filesystem to allow
>> that.
>>
>> Signed-off-by: Jon Maxwell <jmaxwell37@...il.com>
>> ---
>> V2: Remove the "debug" module parameter as per Andrew Lunns suggestion.
> 
> Please mention this in the commit message, why `debug` should not be exposed.
> 
> 
> Kind regards,
> 
> Paul
> 
> 
>> V3: Correctly format v2.
>>   drivers/net/ethernet/intel/e100.c             | 4 ++--
>>   drivers/net/ethernet/intel/igb/igb_main.c     | 2 +-
>>   drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 4 ++--
>>   3 files changed, 5 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/intel/e100.c b/drivers/net/ethernet/intel/e100.c
>> index 01f0f12035caeb7ca1657387538fcebf5c608322..3fcb8daaa2437fa3fe7b98ba9f606dbbb1844e58 100644
>> --- a/drivers/net/ethernet/intel/e100.c
>> +++ b/drivers/net/ethernet/intel/e100.c
>> @@ -171,8 +171,8 @@ static int debug = 3;
>>   static int eeprom_bad_csum_allow = 0;
>>   static int use_io = 0;
>>   module_param(debug, int, 0);
>> -module_param(eeprom_bad_csum_allow, int, 0);
>> -module_param(use_io, int, 0);
>> +module_param(eeprom_bad_csum_allow, int, 0444);
>> +module_param(use_io, int, 0444);
>>   MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
>>   MODULE_PARM_DESC(eeprom_bad_csum_allow, "Allow bad eeprom checksums");
>>   MODULE_PARM_DESC(use_io, "Force use of i/o access mode");
>> diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
>> index 4df8d4153aa5f5ce7ac9dd566180d552be9f5b4f..31d0a43a908c0a4eab4fe1147064a5f5677c9f0b 100644
>> --- a/drivers/net/ethernet/intel/igb/igb_main.c
>> +++ b/drivers/net/ethernet/intel/igb/igb_main.c
>> @@ -202,7 +202,7 @@ static struct notifier_block dca_notifier = {
>>   #endif
>>   #ifdef CONFIG_PCI_IOV
>>   static unsigned int max_vfs;
>> -module_param(max_vfs, uint, 0);
>> +module_param(max_vfs, uint, 0444);
>>   MODULE_PARM_DESC(max_vfs, "Maximum number of virtual functions to allocate per physical function");
>>   #endif /* CONFIG_PCI_IOV */
>>   diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>> index bd541527c8c74d6922e8683e2f4493d9b361f67b..9d26ff82a397d4939cf7adea78c217e4071aa166 100644
>> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>> @@ -147,13 +147,13 @@ static struct notifier_block dca_notifier = {
>>     #ifdef CONFIG_PCI_IOV
>>   static unsigned int max_vfs;
>> -module_param(max_vfs, uint, 0);
>> +module_param(max_vfs, uint, 0444);
>>   MODULE_PARM_DESC(max_vfs,
>>            "Maximum number of virtual functions to allocate per physical function - default is zero and maximum value is 63. (Deprecated)");

I doubt it makes sense to expose a deprecated parameter.

>>   #endif /* CONFIG_PCI_IOV */
>>     static bool allow_unsupported_sfp;
>> -module_param(allow_unsupported_sfp, bool, 0);
>> +module_param(allow_unsupported_sfp, bool, 0444);
>>   MODULE_PARM_DESC(allow_unsupported_sfp,
>>            "Allow unsupported and untested SFP+ modules on 82599-based adapters");
>>   
>