netdev - Re: RFC - document network device carrier management

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Date:	Mon, 10 Sep 2012 04:00:11 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...i.de>
To:	Stephen Hemminger <shemminger@...tta.com>
cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: RFC - document network device carrier management


On Wednesday 2012-08-15 17:58, Stephen Hemminger wrote:
>--- a/Documentation/networking/netdevices.txt	2012-06-22 08:27:46.729168196 -0700
>+++ b/Documentation/networking/netdevices.txt	2012-08-15 08:56:31.120429994 -0700
>@@ -45,6 +45,36 @@ drop, truncate, or pass up oversize pack
> packets is preferred.
> 
> 
>+CARRIER
>+=======
>+Most network devices have an operational state that the device
>+monitors. The Linux kernel uses the name "carrier" for this flag which
>+is a historical reference to old modems. Carrier is reported to
>+userspace via the IFF_RUNNING flag from SIOCGIFFLAGS ioctl.

I think Netlink should be mentioned instead:

Carrier is reported to userspace via the IFF_RUNNING flag in
struct ifinfomsg.ifi_flags returned by RTM_GETLINK (see rtnetlink(7)).

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