Re: netdevice.7 SIOCGIFFLAGS/SIOCSIFFLAGS

[Alejandro Colomar (man-pages)]

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@xxxxxxxxx <mailto:alx.manpages@xxxxxxxxx>> 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@xxxxxxxxx <mailto:alx.manpages@xxxxxxxxx>> 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@xxxxxxxxx <mailto:alx.manpages@xxxxxxxxx>> 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/