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From: Jiri Pirko <jiri@resnulli.us>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Jakub Kicinski <kuba@kernel.org>,
	netdev@vger.kernel.org, davem@davemloft.net,
	jacob.e.keller@intel.com, roopa@nvidia.com, mlxsw@nvidia.com
Subject: Re: [patch net-next RFC 00/10] introduce line card support for modular switch
Date: Thu, 21 Jan 2021 16:34:10 +0100	[thread overview]
Message-ID: <20210121153410.GF3565223@nanopsycho.orion> (raw)
In-Reply-To: <YAjEUdYnGSPjZSy5@lunn.ch>

Thu, Jan 21, 2021 at 01:01:21AM CET, andrew@lunn.ch wrote:
>On Wed, Jan 20, 2021 at 03:41:58PM -0800, Jakub Kicinski 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?
>
>Hi Jakub
>
>A complete guess, but i think it will be the BMC, not the ASIC. There
>have been patches from Mellanox in the past for a BMC, i think sent to
>arm-soc, for the ASPEED devices often used as BMCs. And the BMC is
>often the device doing power management. So what might be missing is
>an interface between the driver and the BMC. But that then makes the
>driver system specific. A OEM who buys ASICs and makes their own board
>could have their own BMC running there own BMC firmware.
>
>All speculation...

Basically all correct.

The thing is mlxsw and the i2c driver cannot talk to each other:
1) It would be ugly
2) They may likely be on a different host


>
>      Andrew

  parent reply	other threads:[~2021-01-21 15:35 UTC|newest]

Thread overview: 80+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-13 12:12 [patch net-next RFC 00/10] introduce line card support for modular switch Jiri Pirko
2021-01-13 12:12 ` [patch net-next RFC 01/10] devlink: add support to create line card and expose to user Jiri Pirko
2021-01-15 15:47   ` Ido Schimmel
2021-01-13 12:12 ` [patch net-next RFC 02/10] devlink: implement line card provisioning Jiri Pirko
2021-01-15 16:03   ` Ido Schimmel
2021-01-15 16:51     ` Jiri Pirko
2021-01-15 18:09       ` Ido Schimmel
2021-01-18 12:50         ` Jiri Pirko
2021-01-13 12:12 ` [patch net-next RFC 03/10] devlink: implement line card active state Jiri Pirko
2021-01-15 16:06   ` Ido Schimmel
2021-01-15 16:52     ` Jiri Pirko
2021-01-13 12:12 ` [patch net-next RFC 04/10] devlink: append split port number to the port name Jiri Pirko
2021-01-13 12:12 ` [patch net-next RFC 05/10] devlink: add port to line card relationship set Jiri Pirko
2021-01-15 16:10   ` Ido Schimmel
2021-01-15 16:53     ` Jiri Pirko
2021-01-13 12:12 ` [patch net-next RFC 06/10] netdevsim: introduce line card support Jiri Pirko
2021-01-13 12:12 ` [patch net-next RFC 07/10] netdevsim: allow port objects to be linked with line cards Jiri Pirko
2021-01-13 12:12 ` [patch net-next RFC 08/10] netdevsim: create devlink line card object and implement provisioning Jiri Pirko
2021-01-15 16:30   ` Ido Schimmel
2021-01-15 16:54     ` Jiri Pirko
2021-01-13 12:12 ` [patch net-next RFC 09/10] netdevsim: implement line card activation Jiri Pirko
2021-01-13 12:12 ` [patch net-next RFC 10/10] selftests: add netdevsim devlink lc test Jiri Pirko
2021-01-13 13:39 ` [patch iproute2/net-next RFC] devlink: add support for linecard show and provision Jiri Pirko
2021-01-14  2:07 ` [patch net-next RFC 00/10] introduce line card support for modular switch Andrew Lunn
2021-01-14  7:39   ` Jiri Pirko
2021-01-14 22:56     ` Jacob Keller
2021-01-15 14:19       ` Jiri Pirko
2021-01-19 11:56   ` Jiri Pirko
2021-01-19 14:51     ` Andrew Lunn
2021-01-20  8:36       ` Jiri Pirko
2021-01-20 13:56         ` Andrew Lunn
2021-01-20 23:41           ` Jakub Kicinski
2021-01-21  0:01             ` Andrew Lunn
2021-01-21  0:16               ` Jakub Kicinski
2021-01-21 15:34               ` Jiri Pirko [this message]
2021-01-21 15:32             ` Jiri Pirko
2021-01-21 16:38               ` David Ahern
2021-01-22  7:28                 ` Jiri Pirko
2021-01-22 14:13                   ` Andrew Lunn
2021-01-26 11:33                     ` Jiri Pirko
2021-01-26 13:56                       ` Andrew Lunn
2021-01-27  7:57                         ` Jiri Pirko
2021-01-27 14:14                           ` Andrew Lunn
2021-01-27 14:57                             ` David Ahern
2021-01-28  8:14                             ` Jiri Pirko
2021-01-28 14:17                               ` Andrew Lunn
2021-01-29  7:20                                 ` Jiri Pirko
     [not found]                                   ` <YBQujIdnFtEhWqTF@lunn.ch>
2021-01-29 16:45                                     ` Vadim Pasternak
2021-01-29 17:31                                       ` Andrew Lunn
2021-01-30 14:19                                         ` Jiri Pirko
     [not found]                                           ` <251d1e12-1d61-0922-31f8-a8313f18f194@gmail.com>
2021-02-01  8:16                                             ` Jiri Pirko
2021-02-01 13:41                                               ` Andrew Lunn
2021-02-03 14:57                                                 ` Jiri Pirko
2021-02-03 16:26                                                   ` Andrew Lunn
2021-02-01  1:43                                       ` Andrew Lunn
2021-01-22  8:05                 ` Jiri Pirko
2021-01-19 16:23     ` David Ahern
2021-01-20  8:37       ` Jiri Pirko
2021-01-14  2:27 ` Jakub Kicinski
2021-01-14  7:48   ` Jiri Pirko
2021-01-14 23:30     ` Jakub Kicinski
2021-01-15 14:39       ` Jiri Pirko
2021-01-15 19:26         ` Jakub Kicinski
2021-01-18 13:00           ` Jiri Pirko
2021-01-18 17:59             ` Jakub Kicinski
2021-01-19 11:51               ` Jiri Pirko
2021-01-18 22:55             ` David Ahern
2021-01-22  8:01               ` Jiri Pirko
2021-01-14 22:58   ` Jacob Keller
2021-01-14 23:20     ` Jakub Kicinski
2021-01-15 14:40       ` Jiri Pirko
2021-01-15 15:43 ` Ido Schimmel
2021-01-15 16:55   ` Jiri Pirko
2021-01-15 18:01     ` Ido Schimmel
2021-01-18 13:03       ` Jiri Pirko
2021-01-18 18:01 ` Edwin Peer
2021-01-18 22:57   ` David Ahern
2021-01-18 23:40     ` Edwin Peer
2021-01-19  2:39       ` David Ahern
2021-01-19  5:06         ` Edwin Peer

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