netdev - Re: [PATCH net-next] tools: ynl-gen: generate docs for <name>_max/

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Date: Wed, 14 Jun 2023 21:17:15 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: "Kubalewski, Arkadiusz" <arkadiusz.kubalewski@...el.com>, Jonathan
 Corbet <corbet@....net>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "davem@...emloft.net" <davem@...emloft.net>, "pabeni@...hat.com"
 <pabeni@...hat.com>, "edumazet@...gle.com" <edumazet@...gle.com>,
 "chuck.lever@...cle.com" <chuck.lever@...cle.com>,
 linux-doc@...r.kernel.org
Subject: Re: [PATCH net-next] tools: ynl-gen: generate docs for
 <name>_max/_mask enums

On Wed, 14 Jun 2023 22:11:38 +0000 Kubalewski, Arkadiusz wrote:
> Thanks for pointing this, but it doesn't work :/
> 
> I tried described format but still ./scripts/kernel-doc warns about it.
> Same as 'make htmldocs' does, as it uses ./scripts/kernel-doc
> 
> Also, if the enum is not described in the header, the docs produced by
> the 'make htmldocs' would list the enum with the comment "undescribed".

Oh, you're right :S Looks like private: does not work for enums.

> It seems we need fixing:
> - prevent warning from ./scripts/kernel-doc, so enums marked as "private:"
>   would not warn
> - generate __<ENUM_NAME>_MAX while marking them as "/* private: */"
> - add some kind of "pattern exclude" directive/mechanics for generating
>   docs with sphinx
> 
> Does it make sense?
> TBH, not yet sure if all above are possible..

Let's ask Jon, and wait for him to chime in, I don't think these
warnings should be a blocker for new families.

Jon, we have some "meta" entries in the uAPI enums in netlink 
to mark the number of attributes, eg:

enum {
	NETDEV_A_DEV_IFINDEX = 1,
	NETDEV_A_DEV_PAD,
	NETDEV_A_DEV_XDP_FEATURES,
/* private: */
	__NETDEV_A_DEV_MAX, // this
	NETDEV_A_DEV_MAX = (__NETDEV_A_DEV_MAX - 1) // and this
};

Also masks of all flags like:

enum netdev_xdp_act {
	NETDEV_XDP_ACT_BASIC = 1,
	NETDEV_XDP_ACT_REDIRECT = 2,
	NETDEV_XDP_ACT_NDO_XMIT = 4,
	NETDEV_XDP_ACT_XSK_ZEROCOPY = 8,
	NETDEV_XDP_ACT_HW_OFFLOAD = 16,
	NETDEV_XDP_ACT_RX_SG = 32,
	NETDEV_XDP_ACT_NDO_XMIT_SG = 64,
/* private: */
	NETDEV_XDP_ACT_MASK = 127, // this
};

which user space should not care about.

I was hoping we can mark them as /* private: */ but that doesn't
work, when we add kdocs without documenting those - there's a warning.
Is this a known problem? Is it worth fixing?
Do we need to fix both kernel-doc and sphinx or just the former?