From: Xie He <xie.he.0141@gmail.com>
To: Martin Schiller <ms@dev.tdt.de>
Cc: Andrew Hendry <andrew.hendry@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Linux X25 <linux-x25@vger.kernel.org>,
Linux Kernel Network Developers <netdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH net-next v4 2/5] net/lapb: support netdev events
Date: Mon, 23 Nov 2020 01:36:45 -0800 [thread overview]
Message-ID: <CAJht_EMjO_Tkm93QmAeK_2jg2KbLdv2744kCSHiZLy48aXiHnw@mail.gmail.com> (raw)
In-Reply-To: <d85a4543eae46bac1de28ec17a2389dd@dev.tdt.de>
On Mon, Nov 23, 2020 at 1:00 AM Martin Schiller <ms@dev.tdt.de> wrote:
>
> AFAIK the carrier can't be up before the device is up. Therefore, there
> will be a NETDEV_CHANGE event after the NETDEV_UP event.
>
> This is what I can see in my tests (with the HDLC interface).
>
> Is the behaviour different for e.g. lapbether?
Some drivers don't support carrier status and will never change it.
Their carrier status will always be UP. There will not be a
NETDEV_CHANGE event.
lapbether doesn't change carrier status. I also have my own virtual
HDLC WAN driver (for testing) which also doesn't change carrier
status.
I just tested with lapbether. When I bring up the interface, there
will only be NETDEV_PRE_UP and then NETDEV_UP. There will not be
NETDEV_CHANGE. The carrier status is alway UP.
I haven't tested whether a device can receive NETDEV_CHANGE when it is
down. It's possible for a device driver to call netif_carrier_on when
the interface is down. Do you know what will happen if a device driver
calls netif_carrier_on when the interface is down?
next prev parent reply other threads:[~2020-11-23 9:36 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-20 5:40 [PATCH net-next v4 0/5] net/x25: netdev event handling Martin Schiller
2020-11-20 5:40 ` [PATCH net-next v4 1/5] net/x25: handle additional netdev events Martin Schiller
2020-11-20 5:40 ` [PATCH net-next v4 2/5] net/lapb: support " Martin Schiller
2020-11-20 23:11 ` Xie He
2020-11-20 23:50 ` Xie He
2020-11-23 6:55 ` Martin Schiller
2020-11-23 8:31 ` Xie He
2020-11-23 9:00 ` Martin Schiller
2020-11-23 9:36 ` Xie He [this message]
2020-11-23 10:08 ` Xie He
2020-11-23 10:38 ` Martin Schiller
2020-11-23 11:17 ` Xie He
2020-11-23 19:36 ` Jakub Kicinski
2020-11-23 22:09 ` Xie He
2020-11-24 5:29 ` Martin Schiller
2020-11-20 5:40 ` [PATCH net-next v4 3/5] net/lapb: fix t1 timer handling for LAPB_STATE_0 Martin Schiller
2020-11-20 5:40 ` [PATCH net-next v4 4/5] net/x25: fix restart request/confirm handling Martin Schiller
2020-11-20 5:40 ` [PATCH net-next v4 5/5] net/x25: remove x25_kill_by_device() Martin Schiller
2020-11-20 22:40 ` [PATCH net-next v4 0/5] net/x25: netdev event handling Xie He
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAJht_EMjO_Tkm93QmAeK_2jg2KbLdv2744kCSHiZLy48aXiHnw@mail.gmail.com \
--to=xie.he.0141@gmail.com \
--cc=andrew.hendry@gmail.com \
--cc=davem@davemloft.net \
--cc=kuba@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-x25@vger.kernel.org \
--cc=ms@dev.tdt.de \
--cc=netdev@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).