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

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Date: Wed, 14 Feb 2024 08:22:19 +0100
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: 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

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)");
>   #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");
>