Re: netdevice.7 SIOCGIFFLAGS/SIOCSIFFLAGS

Hi Erik,

On 10/2/21 18:35, Erik Flodin wrote:

A bit more than a month has passed so here's a ping :)

// Erik

Thanks for the ping.

alarm(3600 * 24 * 30);  // :)

On Fri, 30 Apr 2021 at 21:32, Alejandro Colomar (man-pages) 
<alx.manpages@gmail.com <mailto:alx.manpages@gmail.com>> wrote:

    [PING mtk, netdev@]
    [CC += linux-kernel]

    Hi Erik,

    On 4/29/21 9:45 PM, Erik Flodin wrote:
     > On Wed, 14 Apr 2021 at 21:56, Alejandro Colomar (man-pages)
     > <alx.manpages@gmail.com <mailto:alx.manpages@gmail.com>> wrote:
     >>
     >> [CC += netdev]
     >>
     >> Hi Erik,
     >>
     >> On 4/14/21 8:52 PM, Erik Flodin wrote:
     >>> Hi,
     >>>
     >>> On Fri, 19 Mar 2021 at 20:53, Alejandro Colomar (man-pages)
     >>> <alx.manpages@gmail.com <mailto:alx.manpages@gmail.com>> wrote:
     >>>> On 3/17/21 3:12 PM, Erik Flodin wrote:
     >>>>> The documentation for SIOCGIFFLAGS/SIOCSIFFLAGS in
    netdevice.7 lists
     >>>>> IFF_LOWER_UP, IFF_DORMANT and IFF_ECHO, but those can't be set in
     >>>>> ifr_flags as it is only a short and the flags start at 1<<16.
     >>>>>
     >>>>> See also
    https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=746e6ad23cd6fec2edce056e014a0eabeffa838c
    <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=746e6ad23cd6fec2edce056e014a0eabeffa838c>
     >>>>>
     >>>>
     >>>> I don't know what's the history of that.
     >>>
     >>> Judging from commit message in the commit linked above it was
    added by
     >>> mistake. As noted the flags are accessible via netlink, just
    not via
     >>> SIOCGIFFLAGS.
     >>>
     >>> // Erik
     >>>
     >>
     >> I should have CCd netdev@ before.  Thanks for the update.  Let's
    see if
     >> anyone there can comment.
     >>
     >> Thanks,
     >>
     >> Alex
     >>

     > Hi again,
     >
     > Have there been any updates on this one?

    No, Noone from the kernel answered.  And I'm sorry, but I'm not sure
    what is going on in the code, so I don't want to close this here by just
    removing those flags from the manual page, because I worry that the
    actual code may be wrong or something.  So I prefer that when Michael
    has some time he can maybe review this and say something.  Ideally,
    someone from the kernel would also respond, but they haven't.  I've CCd
    the LKML; let's see if someone reads this and can help.

    Thanks,

    Alex

    P.S.:  Please, if we haven't responded in a month from now, ping us
    again.  Thanks again.

     >
     > // Erik
     >
     >>
     >> --
     >> Alejandro Colomar
     >> Linux man-pages comaintainer;
    https://www.kernel.org/doc/man-pages/
    <https://www.kernel.org/doc/man-pages/>
     >> http://www.alejandro-colomar.es/ <http://www.alejandro-colomar.es/>

    -- 
    Alejandro Colomar
    Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/
    <https://www.kernel.org/doc/man-pages/>
    http://www.alejandro-colomar.es/ <http://www.alejandro-colomar.es/>

-- 
Alejandro Colomar
Linux man-pages comaintainer; http://www.kernel.org/doc/man-pages/
http://www.alejandro-colomar.es/