Re: adding if_dev member to struct ifnet

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

  • Next message: Harti Brandt: "Re: adding if_dev member to struct ifnet" 
    To: Brooks Davis <brooks@one-eyed-alien.net>
Date: Tue, 30 Sep 2003 19:56:41 +0200

    In message <20030930171535.GA31908@Odin.AC.HMC.Edu>, Brooks Davis writes:

    >> Somebody please explain how this would work for non-hardware
    >> interfaces like if_loop, if_tun, if_tap etc ?
    >
    >if_dev would be NULL when a device_t was not available. Code which used
    >this feature would be required to either check that if_dev was non-NULL
    >before trying to use it or have special knowldege that it only gets
    >called with struct ifnet instances which have a non-NULL if_dev member.
    >For instance, driver routines which take a struct ifnet would know that
    >they are only called on their own ifnet so they could assume they had
    >filled it in.

    So you'd still have to keep the if_name + if_unit around for the
    drivers which do not have a device_t ? 

    -- 
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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  • Next message: Harti Brandt: "Re: adding if_dev member to struct ifnet"

    Relevant Pages

    • Re: adding if_dev member to struct ifnet
      ... In message, Brooks Davis writes: ... >before trying to use it or have special knowldege that it only gets ... driver routines which take a struct ifnet would know that ...
      (freebsd-net)
    • Re: adding if_dev member to struct ifnet
      ... In message, Brooks Davis writes: ... >before trying to use it or have special knowldege that it only gets ... driver routines which take a struct ifnet would know that ...
      (freebsd-arch)