Re: adding if_dev member to struct ifnet

From: John Baldwin (jhb_at_FreeBSD.org)
Date: 09/30/03

  • Next message: Poul-Henning Kamp: "Re: adding if_dev member to struct ifnet" 
    Date: Tue, 30 Sep 2003 10:33:48 -0400 (EDT)
To: Poul-Henning Kamp <phk@phk.freebsd.dk>

    On 30-Sep-2003 Poul-Henning Kamp wrote:
    > 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.

    You mean like dev_t and device_t shouldn't be tangled like we do
    with si_drv1? Oh, wait... 

    -- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/
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  • Next message: Poul-Henning Kamp: "Re: adding if_dev member to struct ifnet"