netdev - [PATCH ethtool-next 0/4] Extend module EEPROM API

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Date:   Fri, 23 Apr 2021 10:23:12 +0300
From:   Moshe Shemesh <moshe@...dia.com>
To:     Michal Kubecek <mkubecek@...e.cz>, Andrew Lunn <andrew@...n.ch>,
        "Jakub Kicinski" <kuba@...nel.org>,
        Don Bollinger <don@...bollingers.org>, <netdev@...r.kernel.org>
CC:     Vladyslav Tarasiuk <vladyslavt@...dia.com>,
        Moshe Shemesh <moshe@...dia.com>
Subject: [PATCH ethtool-next 0/4] Extend module EEPROM API

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 4.0.

Moreover, CMIS 4.0 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.

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 4.0
  ethtool: Update manpages to reflect changes to getmodule (-m) command

 Makefile.am             |   3 +-
 qsfp-dd.c => cmis4.c    | 220 +++++++++++---------
 cmis4.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 | 438 ++++++++++++++++++++++++++++++++++++++++
 qsfp-dd.h               | 125 ------------
 qsfp.c                  | 129 +++++++-----
 qsfp.h                  |  52 ++---
 sff-common.c            |   3 +
 sff-common.h            |   3 +-
 15 files changed, 876 insertions(+), 304 deletions(-)
 rename qsfp-dd.c => cmis4.c (55%)
 create mode 100644 cmis4.h
 create mode 100644 list.h
 create mode 100644 netlink/module-eeprom.c
 delete mode 100644 qsfp-dd.h

-- 
2.26.2