netdev - Re: [PATCH net-next] net: ieee802154: Fix compilation error when CONFIG_IEEE802154_NL802154

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Message-ID: <4187e35d-0965-cf65-bff5-e4f71a04d272@nvidia.com>
Date:   Wed, 31 Aug 2022 09:20:39 +0300
From:   Gal Pressman <gal@...dia.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Leon Romanovsky <leonro@...dia.com>
Subject: Re: [PATCH net-next] net: ieee802154: Fix compilation error when
 CONFIG_IEEE802154_NL802154_EXPERIMENTAL is disabled

On 31/08/2022 09:13, Jakub Kicinski wrote:
> On Tue, 30 Aug 2022 13:12:37 +0300 Gal Pressman wrote:
>> When CONFIG_IEEE802154_NL802154_EXPERIMENTAL is disabled,
>> NL802154_CMD_DEL_SEC_LEVEL is undefined and results in a compilation
>> error:
>> net/ieee802154/nl802154.c:2503:19: error: 'NL802154_CMD_DEL_SEC_LEVEL' undeclared here (not in a function); did you mean 'NL802154_CMD_SET_CCA_ED_LEVEL'?
>>  2503 |  .resv_start_op = NL802154_CMD_DEL_SEC_LEVEL + 1,
>>       |                   ^~~~~~~~~~~~~~~~~~~~~~~~~~
>>       |                   NL802154_CMD_SET_CCA_ED_LEVEL
>>
>> Use __NL802154_CMD_AFTER_LAST instead of
>> 'NL802154_CMD_DEL_SEC_LEVEL + 1' to indicate the last command.
>>
>> Fixes: 9c5d03d36251 ("genetlink: start to validate reserved header bytes")
>> Reviewed-by: Leon Romanovsky <leonro@...dia.com>
>> Signed-off-by: Gal Pressman <gal@...dia.com>
>> ---
>>  net/ieee802154/nl802154.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
>> index 38c4f3cb010e..dbfd24c70bd0 100644
>> --- a/net/ieee802154/nl802154.c
>> +++ b/net/ieee802154/nl802154.c
>> @@ -2500,7 +2500,7 @@ static struct genl_family nl802154_fam __ro_after_init = {
>>  	.module = THIS_MODULE,
>>  	.ops = nl802154_ops,
>>  	.n_ops = ARRAY_SIZE(nl802154_ops),
>> -	.resv_start_op = NL802154_CMD_DEL_SEC_LEVEL + 1,
>> +	.resv_start_op = __NL802154_CMD_AFTER_LAST,
>>  	.mcgrps = nl802154_mcgrps,
>>  	.n_mcgrps = ARRAY_SIZE(nl802154_mcgrps),
>>  };
> Thanks for the fix! I think we should switch to 
> NL802154_CMD_SET_WPAN_PHY_NETNS + 1, tho.
>
> The point is to set the value to the cmd number after _currently_ 
> last defined command. The meta-value like LAST will move next time
> someone adds a command, meaning the validation for new commands will
> never actually come.

I see, missed that part.

So, shouldn't it be:
#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
        .resv_start_op = NL802154_CMD_DEL_SEC_LEVEL + 1,
#else
        .resv_start_op = NL802154_CMD_SET_WPAN_PHY_NETNS + 1,
#endif

?