Re: adding if_dev member to struct ifnet

From: Poul-Henning Kamp (phk_at_phk.freebsd.dk)
Date: 09/30/03

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    To: Vincent Jardin <vjardin@wanadoo.fr>
Date: Tue, 30 Sep 2003 09:10:54 +0200

    In message <200309301045.15776.vjardin@wanadoo.fr>, Vincent Jardin writes:
    >Le Mardi 30 Septembre 2003 03:03, Brooks Davis a écrit :
    >> [Previously posted to -net in another form.]
    >>
    >> I propose to add an if_dev member to struct ifnet. It would be of type
    >> device_t and be defined to point to the device for the interface or NULL
    >> if there is no device (or if there was not an easy way to get access to
    >> one).
    >>
    >> This change would codify the the relationship between an interface and
    >> the underlying physical device. It also would get rid of the existing
    >> abuses of if_name to look up the driver associated with an interface
    >> and simplify a number of messy cases in the conversion from if_unit and
    >> if_name to if_xname.
    >>
    >> Does this seem like a reasonable thing to do?
    >
    >Yes, if it helps to remove if_name/if_unit, it is a thing to do. Moreover it
    >sounds a good idea to have the if_dev field into the ifnet structure.

    Somebody please explain how this would work for non-hardware
    interfaces like if_loop, if_tun, if_tap etc ?

    device_t is what we use to hitch drivers to hardware.

    ifnet is what we use to hitch drivers to the netstack.

    They should not be tangled. 

    -- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.
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