From: Lukasz Majewski <lukma@denx.de>
To: Jakub Kicinski <kuba@kernel.org>
Cc: netdev@vger.kernel.org, Paolo Abeni <pabeni@redhat.com>,
Casper Andersson <casper.casan@gmail.com>,
Andrew Lunn <andrew@lunn.ch>, Eric Dumazet <edumazet@google.com>,
Vladimir Oltean <olteanv@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Oleksij Rempel <o.rempel@pengutronix.de>,
Tristram.Ha@microchip.com,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Ravi Gunasekaran <r-gunasekaran@ti.com>,
Simon Horman <horms@kernel.org>,
Nikita Zhandarovich <n.zhandarovich@fintech.ru>,
Murali Karicheri <m-karicheri2@ti.com>,
Jiri Pirko <jiri@resnulli.us>,
Dan Carpenter <dan.carpenter@linaro.org>,
Ziyang Xuan <william.xuanziyang@huawei.com>,
Shigeru Yoshida <syoshida@redhat.com>,
"Ricardo B. Marliere" <ricardo@marliere.net>,
linux-kernel@vger.kernel.org
Subject: Re: [net-next PATCH] hsr: Simplify code for announcing HSR nodes timer setup
Date: Tue, 30 Apr 2024 14:52:43 +0200 [thread overview]
Message-ID: <20240430145243.34b82105@wsk> (raw)
In-Reply-To: <20240429104026.0fe3de0f@kernel.org>
[-- Attachment #1: Type: text/plain, Size: 1547 bytes --]
Hi Jakub,
> On Mon, 29 Apr 2024 12:09:04 +0200 Lukasz Majewski wrote:
> > > if the
> > > timer is already running we'll mess with the spacing of the
> > > frames, no?
> >
> > When NETDEV_CHANGE is trigger for reason different than carrier (or
> > port state) change and the netif_oper_up() returns true, the period
> > for HSR supervisory frames (i.e. HSR_ANNOUNCE_INTEVAL) would be
> > violated.
> >
> > What are here the potential threads?
>
> Practically speaking I'm not sure if anyone uses any of the weird
> IFF_* flags, but they are defined in uAPI (enum net_device_flags) and
> I don't see much validation so presumably it's possible to flip them.
Ok, I see.
Then - what would you recommend instead? The approach with manual
checking the previous state has described drawbacks.
I've poked around kernel sources and it looks like the netif_oper_up()
is used in conjunction with netif_running():
netif_running(dev) && netif_oper_up(dev)
so, IMHO the netif_running(dev) shall be added to the condition.
In the uapi/include/linux/if.h there are serveral IF_OPER_* flags
defined. It looks to me that only for the IF_OPER_UP the HSR interface
shall send announcement supervisory frames. With other conditions it
shall be turned off.
Best regards,
Lukasz Majewski
--
DENX Software Engineering GmbH, Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 488 bytes --]
next prev parent reply other threads:[~2024-04-30 12:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-25 15:39 [net-next PATCH] hsr: Simplify code for announcing HSR nodes timer setup Lukasz Majewski
2024-04-27 0:33 ` Jakub Kicinski
2024-04-29 10:09 ` Lukasz Majewski
2024-04-29 17:40 ` Jakub Kicinski
2024-04-30 12:52 ` Lukasz Majewski [this message]
2024-04-30 14:42 ` Jakub Kicinski
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=20240430145243.34b82105@wsk \
--to=lukma@denx.de \
--cc=Tristram.Ha@microchip.com \
--cc=andrew@lunn.ch \
--cc=bigeasy@linutronix.de \
--cc=casper.casan@gmail.com \
--cc=dan.carpenter@linaro.org \
--cc=davem@davemloft.net \
--cc=edumazet@google.com \
--cc=horms@kernel.org \
--cc=jiri@resnulli.us \
--cc=kuba@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=m-karicheri2@ti.com \
--cc=n.zhandarovich@fintech.ru \
--cc=netdev@vger.kernel.org \
--cc=o.rempel@pengutronix.de \
--cc=olteanv@gmail.com \
--cc=pabeni@redhat.com \
--cc=r-gunasekaran@ti.com \
--cc=ricardo@marliere.net \
--cc=syoshida@redhat.com \
--cc=william.xuanziyang@huawei.com \
/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 read-only IMAP folder(s) and NNTP newsgroup(s).