[ethtool-next,v3,0/2] add netlink support for rss get

Message

Mogilappagari, Sudheer Dec. 26, 2022, 9:12 p.m. UTC

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": "on",
            "xor": "off",
            "crc32": "off"
        }
    } ]

Signed-off-by: Sudheer Mogilappagari <[e-mail]>
---
v3:
-Made hash key as an array of ints.
-Skip json field when not supported.
-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               |  43 ++++++++
 common.h               |   7 ++
 ethtool.c              |  46 +-------
 netlink/desc-ethtool.c |  11 ++
 netlink/extapi.h       |   2 +
 netlink/rss.c          | 241 +++++++++++++++++++++++++++++++++++++++++
 7 files changed, 311 insertions(+), 41 deletions(-)
 create mode 100644 netlink/rss.c