netdev - [PATCH ethtool-next v6 0/2] add netlink support for rss get

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Message-Id: <20230111203644.1176186-1-sudheer.mogilappagari@intel.com>
Date:   Wed, 11 Jan 2023 12:36:42 -0800
From:   Sudheer Mogilappagari <sudheer.mogilappagari@...el.com>
To:     netdev@...r.kernel.org
Cc:     kuba@...nel.org, mkubecek@...e.cz, andrew@...n.ch,
        sridhar.samudrala@...el.com, anthony.l.nguyen@...el.com
Subject: [PATCH ethtool-next v6 0/2] add netlink support for rss get

These patches add netlink based handler to fetch RSS information
using "ethtool -x <eth> [context %d]" command.

Output without --json option
$ethtool -x eno2
RX flow hash indirection table for eno2 with 8 RX ring(s):
    0:      0     0     0     0     0     0     0     0
    8:      1     1     1     1     1     1     1     1
   ...skip similar lines...
  120:      7     7     7     7     7     7     7     7
RSS hash key:
be:c3:13:a6:59:9a:c3:c5:d8:60:75:2b:4c:b2:12:cc:5c:4e:34:
8a:f9:ab:16:c7:19:5d:ab:1d:b5:c1:c7:57:c7:a2:e1:2b:e3:ea:
02:60:88:8e:96:ef:2d:64:d2:de:2c:16:72:b6
RSS hash function:
    toeplitz: on
    xor: off
    crc32: off

Sample output with json option:
$ethtool --json -x eno2
[ {
    "ifname": "eno2",
    "rss-indirection-table": [ 0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,
    ...skip similar lines...
    7,7,7,7,7,7,7,7 ],
    "rss-hash-key": [ 190,195,19,166,..],
    "rss-hash-function": "toeplitz"
    } ]

Signed-off-by: Sudheer Mogilappagari <sudheer.mogilappagari@...el.com>
---
v5:
- Fixed use of same socket for fetching rings info and RSS info
- Added checks to test if a field exists before accessing reply message
- Refactor print functions and avoid use of ethtool_rxfh structure

v4: 
-Fixed hash function values in example output of commit message.

v3:
-Made hash key as an array of ints.
-Skip json field when not supported.
-Made hash function values as true/false instead of on/off
-Formatted key strings as per review comments. 

v2:
-Added json support
---
Sudheer Mogilappagari (2):
  Move code that print rss info into common file
  netlink: add netlink handler for get rss (-x)

 Makefile.am            |   2 +-
 common.c               |  36 +++++++
 common.h               |   6 +-
 ethtool.c              |  44 ++------
 netlink/desc-ethtool.c |  11 ++
 netlink/extapi.h       |   2 +
 netlink/rss.c          | 231 +++++++++++++++++++++++++++++++++++++++++
 7 files changed, 295 insertions(+), 37 deletions(-)
 create mode 100644 netlink/rss.c

-- 
2.31.1