netdev - Re: [Xen-devel] [PATCH] xen-netback: Turn off the carrier if the guest is not able to receive

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20140808093356.04d7228b@haswell.linuxnetplumber.net>
Date:	Fri, 8 Aug 2014 09:33:56 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Zoltan Kiss <zoltan.kiss@...rix.com>
Cc:	David Vrabel <david.vrabel@...rix.com>,
	Wei Liu <wei.liu2@...rix.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	<netdev@...r.kernel.org>, <xen-devel@...ts.xenproject.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH] xen-netback: Turn off the carrier if the
 guest is not able to receive

This idea of bouncing carrier is wrong. If guest is flow blocked you don't
want to toggle carrier. That will cause problems because applications that are
looking for carrier transistions like routing daemons will be notified.

If running a routing daemon this will also lead to link flapping which
is very bad and cause lots of other work for peer routing daemons.

Carrier is not a suitable flow control mechanism.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html