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Subject: Re: [PATCH v3 1/4] iwlwifi: mei: add the driver to allow cooperation
 with CSME
To:     "Grumbach, Emmanuel" <emmanuel.grumbach@intel.com>,
        Kalle Valo <kvalo@codeaurora.org>,
        Emmanuel Grumbach <egrumbach@gmail.com>
Cc:     "Coelho, Luciano" <luciano.coelho@intel.com>,
        linux-wireless <linux-wireless@vger.kernel.org>,
        "Beker, Ayala" <ayala.beker@intel.com>
References: <20210623141033.27475-1-emmanuel.grumbach@intel.com>
 <87bl7vi3o1.fsf@codeaurora.org>
 <CANUX_P3QE9xNnQLT=mHNDp4VCv37Bcjuvn9O1wQ4Btejjkbrvg@mail.gmail.com>
 <87k0l0c8pa.fsf@codeaurora.org>
 <SA0PR11MB4752B06F7330E6C14717E113F2F49@SA0PR11MB4752.namprd11.prod.outlook.com>
From:   Arend van Spriel <arend.vanspriel@broadcom.com>
Message-ID: <7f027e15-71a7-8843-7b60-91b57f88a553@broadcom.com>
Date:   Mon, 9 Aug 2021 09:49:38 +0200
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On 8/7/2021 8:38 PM, Grumbach, Emmanuel wrote:
>>
>>>>> +     BUILD_BUG_ON((u32)IWL_MEI_AKM_AUTH_OPEN !=
>>>>> +                  (u32)SAP_WIFI_AUTH_TYPE_OPEN);
>>>>> +     BUILD_BUG_ON((u32)IWL_MEI_AKM_AUTH_RSNA !=
>>>>> +                  (u32)SAP_WIFI_AUTH_TYPE_RSNA);
>>>>> +     BUILD_BUG_ON((u32)IWL_MEI_AKM_AUTH_RSNA_PSK !=
>>>>> +                  (u32)SAP_WIFI_AUTH_TYPE_RSNA_PSK);
>>>>> +     BUILD_BUG_ON((u32)IWL_MEI_AKM_AUTH_SAE !=
>>>>> +                  (u32)SAP_WIFI_AUTH_TYPE_SAE);
>>>>> +
>>>>> +     BUILD_BUG_ON((u32)IWL_MEI_CIPHER_NONE !=
>>>>> +                  (u32)SAP_WIFI_CIPHER_ALG_NONE);
>>>>> +     BUILD_BUG_ON((u32)IWL_MEI_CIPHER_CCMP !=
>>>>> +                  (u32)SAP_WIFI_CIPHER_ALG_CCMP);
>>>>> +     BUILD_BUG_ON((u32)IWL_MEI_CIPHER_GCMP !=
>>>>> +                  (u32)SAP_WIFI_CIPHER_ALG_GCMP);
>>>>> +     BUILD_BUG_ON((u32)IWL_MEI_CIPHER_GCMP_256 !=
>>>>> +                  (u32)SAP_WIFI_CIPHER_ALG_GCMP_256);
>>>>
>>>> These look just weird, and suspicious. You are using two different
>>>> enums but they have to be same values, or what?
>>>
>>> Exactly. I don't want the userspace to have to include all the SAP
>>> protocol header file. OTOH, I don't want to have to translate between
>>> vendor commands attributes values and the SAP values.
>>
>> Why not? I assume you would just need a helper function with switch
>> statements to "translate" between enums, not much more lines of code but
>> a lot cleaner code.
>>
> 
> I disagree that it'll give us a cleaner code.
> What we'll have is two different enums with two different values and functions
> that translate from one value to another. This is very bug prone. When you want
> to debug, you get a value, you always need to think of what type of enum you're
> dealing with.
> I believe your suggestion is not good, but since I am tired arguing I will do it to
> make you happy.

I don't want to flare up this fire further, but have you considered to 
declare the enum values needed by user-space in uapi header and simply 
declare the SAP enum using those values:

#include <uapi/iwlmei.h>

enum sap_cipher {
	SAP_WIFI_CIPHER_ALG_NONE = IWL_MEI_CIPHER_NONE,
	SAP_WIFI_CIPHER_ALG_CCMP = IWL_MEI_CIPHER_CCMP,
		:
};

Seems like assurance enough that user-space api is cleanly separated and 
using the same values.

Regards,
Arend

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