netdev - Re: [patch net-next RFC 00/10] introduce line card support for modular switch

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: <20210121153224.GE3565223@nanopsycho.orion>
Date:   Thu, 21 Jan 2021 16:32:24 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Andrew Lunn <andrew@...n.ch>, netdev@...r.kernel.org,
        davem@...emloft.net, jacob.e.keller@...el.com, roopa@...dia.com,
        mlxsw@...dia.com
Subject: Re: [patch net-next RFC 00/10] introduce line card support for
 modular switch

Thu, Jan 21, 2021 at 12:41:58AM CET, kuba@...nel.org wrote:
>On Wed, 20 Jan 2021 14:56:46 +0100 Andrew Lunn wrote:
>> > No, the FW does not know. The ASIC is not physically able to get the
>> > linecard type. Yes, it is odd, I agree. The linecard type is known to
>> > the driver which operates on i2c. This driver takes care of power
>> > management of the linecard, among other tasks.  
>> 
>> So what does activated actually mean for your hardware? It seems to
>> mean something like: Some random card has been plugged in, we have no
>> idea what, but it has power, and we have enabled the MACs as
>> provisioned, which if you are lucky might match the hardware?
>> 
>> The foundations of this feature seems dubious.
>
>But Jiri also says "The linecard type is known to the driver which
>operates on i2c." which sounds like there is some i2c driver (in user
>space?) which talks to the card and _does_ have the info? Maybe I'm
>misreading it. What's the i2c driver?

That is Vadim's i2c kernel driver, this is going to upstream.