netdev - Re: [PATCH ethtool v4 0/4] Extend module EEPROM API

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Date:   Fri, 9 Jul 2021 01:40:48 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     Moshe Shemesh <moshe@...dia.com>
Cc:     Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>,
        Don Bollinger <don@...bollingers.org>, netdev@...r.kernel.org,
        Vladyslav Tarasiuk <vladyslavt@...dia.com>
Subject: Re: [PATCH ethtool v4 0/4] Extend module EEPROM API

On Thu, Jun 17, 2021 at 08:05:00PM +0300, Moshe Shemesh wrote:
> Ethtool supports module EEPROM dumps via the `ethtool -m <dev>` command.
> But in current state its functionality is limited - offset and length
> parameters, which are used to specify a linear desired region of EEPROM
> data to dump, is not enough, considering emergence of complex module
> EEPROM layouts such as CMIS.
> 
> Moreover, CMIS extends the amount of pages that may be accessible by
> introducing another parameter for page addressing - banks. Besides,
> currently module EEPROM is represented as a chunk of concatenated pages,
> where lower 128 bytes of all pages, except page 00h, are omitted. Offset
> and length are used to address parts of this fake linear memory. But in
> practice drivers, which implement get_module_info() and
> get_module_eeprom() ethtool ops still calculate page number and set I2C
> address on their own.
> 
> This series adds support in `ethtool -m` of dumping an arbitrary page
> specified by page number, bank number and I2C address. Implement netlink
> handler for `ethtool -m` in order to make such requests to the kernel
> and extend CLI by adding corresponding parameters.
> New command line format:
>  ethtool -m <dev> [hex on|off] [raw on|off] [offset N] [length N] [page N] [bank N] [i2c N]
> 
> Netlink infrastructure works on per-page basis and allows dumps of a
> single page at once. But in case user requests human-readable output,
> which currently may require more than one page, userspace can make such
> additional calls to kernel on demand and place pages in a linked list.
> It allows to get pages from cache on demand and pass them to refactored
> SFF decoders.
> 
> Change Log:
> v3 -> v4:
> - Fixed cmis_show_all() prototype
> 
> v2 -> v3:
> - Removed spec version from CMIS identifiers by changing 'CMIS4' and 'cmis4' to 'CMIS' and 'cmis' respectively.
> 
> v1 -> v2:
> - Changed offset defines to specification values.
> - Added default offset value (128) if page number is specified.
> - Fixed return values.
> - Removed page_available()
> 
> 
> 
> Vladyslav Tarasiuk (4):
>   ethtool: Add netlink handler for getmodule (-m)
>   ethtool: Refactor human-readable module EEPROM output for new API
>   ethtool: Rename QSFP-DD identifiers to use CMIS
>   ethtool: Update manpages to reflect changes to getmodule (-m) command
> 
>  Makefile.am             |   3 +-
>  cmis.c                  | 359 +++++++++++++++++++++++++++++++++++++++++
>  cmis.h                  | 128 +++++++++++++++
>  ethtool.8.in            |  14 ++
>  ethtool.c               |   4 +
>  internal.h              |  12 ++
>  list.h                  |  34 ++++
>  netlink/desc-ethtool.c  |  13 ++
>  netlink/extapi.h        |   2 +
>  netlink/module-eeprom.c | 416 ++++++++++++++++++++++++++++++++++++++++++++++++
>  qsfp-dd.c               | 333 --------------------------------------
>  qsfp-dd.h               | 125 ---------------
>  qsfp.c                  | 130 ++++++++-------
>  qsfp.h                  |  51 +++---
>  sff-common.c            |   3 +
>  sff-common.h            |   3 +-
>  16 files changed, 1090 insertions(+), 540 deletions(-)
>  create mode 100644 cmis.c
>  create mode 100644 cmis.h
>  create mode 100644 list.h
>  create mode 100644 netlink/module-eeprom.c
>  delete mode 100644 qsfp-dd.c
>  delete mode 100644 qsfp-dd.h

Series applied, thank you.

Michal

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