linux-kernel - Re: [PATCH RESEND][pciutils] libpci: pci_id_lookup

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Message-ID: <mj+md-20130904.134928.12262.nikam@ucw.cz>
Date:	Wed, 4 Sep 2013 15:57:41 +0200
From:	Martin Mares <mj@....cz>
To:	Tom Gundersen <teg@...m.no>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND][pciutils] libpci: pci_id_lookup - add udev/hwdb
 support

Hello!

First of all: Sorry for not replying to the first mail. I do not follow
linux-pci too much these days (or, I do that in big batches).

> This lets you select hwdb support at compile time.
> 
> hwdb is an efficient hardware database shipped with recent versions of udev.
> It contains among other sources pci.ids so querying hwdb rather than reading
> pci.ids directly should give the same result.
> 
> Ideally Linux distros using udev could stop shipping pci.ids, but use hwdb
> as the only source of this information, which this patch allows.

Generally, I will be glad to include hwdb support in libpci.

There is a couple of details I am concerned with:

> +	if [ -f /usr/include/libudev.h -o -f /usr/local/include/libudev.h ] ; then
> +		HWDB=yes
> +	else
> +		HWDB=no
> +	fi

Does this make sense? Does every version of libudev support hwdb?

> @@ -86,8 +91,58 @@ char
>  *pci_id_lookup(struct pci_access *a, int flags, int cat, int id1, int id2, int id3, int id4)
>  {
>    struct id_entry *n, *best;
> -  u32 id12 = id_pair(id1, id2);
> -  u32 id34 = id_pair(id3, id4);
> +  u32 id12, id34;
> +
> +#ifdef PCI_HAVE_HWDB
> +  if (!(flags & PCI_LOOKUP_SKIP_LOCAL))
> +    {

As you wrote it, hwdb has always priority over pci.ids (unless local lookup is
disabled). As a user, I would expect that pci.ids (being a part of the pciutils)
is the primary source of data and other sources (network lookups, hwdb) are
used only if pci.ids do not match or if explicitly requested.

				Have a nice fortnight
-- 
Martin `MJ' Mares                          <mj@....cz>   http://mj.ucw.cz/
Faculty of Math and Physics, Charles University, Prague, Czech Rep., Earth
Quidquid latine dictum sit, altum videtur.
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