Re: [PATCH net-next] net/mlx5: Implement swp_l4_csum_mode via devlink params

[Daniel Zahka <daniel.zahka@gmail.com>]

On 10/23/25 8:18 AM, Jiri Pirko wrote:
> Wed, Oct 22, 2025 at 09:09:31PM +0200, daniel.zahka@gmail.com wrote:
>> swp_l4_csum_mode controls how L4 transmit checksums are computed when
>> using Software Parser (SWP) hints for header locations.
>>
>> Supported values:
>>   1. device_default: use device default setting.
> Is this different between devices/fw_versions?

That is what I presume. I believe the current setting for 
swp_l4_csum_mode is ultimately encoded in the capabilities advertised to 
the driver during initialization. For example, I am mostly interested in 
mlx5e_psp_init(), which depends on:

     if (!MLX5_CAP_ETH(mdev, swp_csum_l4_partial)) {
         mlx5_core_dbg(mdev, "SWP L4 partial checksum not supported\n");
         return 0;
     }

My guess is that "device_default" means that this bit would depend on 
the device/fw_version.