netdev - Re: [PATCH RFC net-next] bonding: Remove support for use

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: <5c870247-f2b3-4f03-a41f-5ec109f2ffaa@davidwei.uk>
Date: Mon, 22 Jul 2024 09:26:49 -0700
From: David Wei <dw@...idwei.uk>
To: Joe Damato <jdamato@...tly.com>, Jay Vosburgh <jv@...sburgh.net>,
 netdev@...r.kernel.org, Andy Gospodarek <andy@...yhouse.net>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Johannes Berg <johannes@...solutions.net>
Subject: Re: [PATCH RFC net-next] bonding: Remove support for use_carrier

On 2024-07-22 09:19, Joe Damato wrote:
> On Sun, Jul 21, 2024 at 11:28:23PM -0700, David Wei wrote:
>> On 2024-07-21 10:07, Jay Vosburgh wrote:
>>> 	Remove the implementation of use_carrier, the link monitoring
>>> method that utilizes ethtool or ioctl to determine the link state of an
>>> interface in a bond.  The ability to set or query the use_carrier option
>>> remains, but bonding now always behaves as if use_carrier=1, which
>>> relies on netif_carrier_ok() to determine the link state of interfaces.
>>>
>>> 	To avoid acquiring RTNL many times per second, bonding inspects
>>> link state under RCU, but not under RTNL.  However, ethtool
>>> implementations in drivers may sleep, and therefore this strategy is
>>> unsuitable for use with calls into driver ethtool functions.
>>>
>>> 	The use_carrier option was introduced in 2003, to provide
>>> backwards compatibility for network device drivers that did not support
>>> the then-new netif_carrier_ok/on/off system.  Device drivers are now
>>> expected to support netif_carrier_*, and the use_carrier backwards
>>> compatibility logic is no longer necessary.
>>>
>>> Link: https://lore.kernel.org/lkml/000000000000eb54bf061cfd666a@google.com/
>>> Link: https://lore.kernel.org/netdev/20240718122017.d2e33aaac43a.I10ab9c9ded97163aef4e4de10985cd8f7de60d28@changeid/
>>> Signed-off-by: Jay Vosburgh <jv@...sburgh.net>
>>>
>>> ---
>>>
>>> 	I've done some sniff testing and this seems to behave as
>>> expected, except that writing 0 to the sysfs use_carrier fails.  Netlink
>>> permits setting use_carrier to any value but always returns 1; sysfs and
>>> netlink should behave consistently.
>>
>> Net-next is closed until 28 July. Please resubmit then.
> 
> AFAICT, the subject line is marked as RFC (although it is a bit
> confusing as it mentions both PATCH and RFC), but my understanding
> is that RFCs are accepted at any time.

Oh you're right, sorry my mistake.