Re: link-state change for virtual interfaces

On Wed, Sep 25, 2024 at 22:05:41 +0900, Rin Okuyama wrote:

> ````
> # rump.ifconfig shmif0 media auto
> # rump.ifconfig shmif0
> shmif0: flags=0x8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
>   capabilities=0x7ff80<TSO4,IP4CSUM_Rx,IP4CSUM_Tx,TCP4CSUM_Rx>
>   capabilities=0x7ff80<TCP4CSUM_Tx,UDP4CSUM_Rx,UDP4CSUM_Tx,TCP6CSUM_Rx>
>   capabilities=0x7ff80<TCP6CSUM_Tx,UDP6CSUM_Rx,UDP6CSUM_Tx,TSO6>
>   enabled=0
>   address: b2:a0:01:9d:82:a5
>   linkstr: bus1
>   media: Ethernet autoselect
> # rump.ifconfig shmif0 media none
> # rump.ifconfig shmif0
> shmif0: flags=0x8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
>   capabilities=0x7ff80<TSO4,IP4CSUM_Rx,IP4CSUM_Tx,TCP4CSUM_Rx>
>   capabilities=0x7ff80<TCP4CSUM_Tx,UDP4CSUM_Rx,UDP4CSUM_Tx,TCP6CSUM_Rx>
>   capabilities=0x7ff80<TCP6CSUM_Tx,UDP6CSUM_Rx,UDP6CSUM_Tx,TSO6>
>   enabled=0
>   address: b2:a0:6b:44:5b:bd
>   linkstr: bus1
>   media: Ethernet none
> ````
> 
> If `-v` option is specified to ifconfig,
>   linkstate: up
> and
>   linkstate: down
> appear b/w linkstr and media lines. This should happen also for vether:
> 
> https://mail-index.netbsd.org/source-changes/2024/08/20/msg152936.html

I see that ifconfig(8) also talks about the connection between link
state and media state.  So that seems like a natural choice then.

PS: Roy, that passage in ifconfig.8 was added by you back in 2020 and
it seems to have some sort of edito, where the sentence fragment

  +For interface drivers that do not support media status reporting.

is inserted in the middle of a phrase, seemingly at random.  Please,
could you take a look and fix it?

-uwe