more annoying pedantry ... from include/uapi/linux/if.h:
* @IFF_RUNNING: interface RFC2863 OPER_UP. Volatile.
however, both the code in net/core/dev.c:
/**
* netif_oper_up - test if device is operational
* @dev: network device
*
* Check if carrier is operational
*/
static inline bool netif_oper_up(const struct net_device *dev)
{
return (dev->operstate == IF_OPER_UP ||
dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
}
and the explanation in operstates.txt:
ifinfomsg::if_flags & IFF_RUNNING:
Interface is in RFC2863 operational state UP or UNKNOWN.
suggests IFF_RUNNING represents *either* of the operational states UP
or UNKNOWN, not just UP as the comment in if.h claims. is this
misleading? or is this a deliberate explanation somehow taking into
account that the UNKNOWN state is for backward compatibility (whatever
that means)?
i ask since, in my testing, when the interface should have been up,
the attribute file "operstate" for that interface showed "unknown",
and i wondered how worried i should be about that.
rday
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Robert P. J. Day Ottawa, Ontario, CANADA
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