A hds-thresh value is not set correctly if input value is 0.
The cause is that ethtool_ringparam_get_cfg(), which is a internal
function that returns ringparameters from both ->get_ringparam() and
dev->cfg can't return a correct hds-thresh value.

The first patch fixes ethtool_ringparam_get_cfg() to set hds-thresh
value correcltly.

The second patch adds random test for hds-thresh value.
So that we can test 0 value for a hds-thresh properly.

v2:
 - Skips set_hds_thresh_random test when hds-thresh-max value is too
   small. (2/2)
 - Change random range from 1-MAX to 1-(MAX-1). (2/2)

Taehee Yoo (2):
  net: ethtool: fix ethtool_ringparam_get_cfg() returns a hds_thresh
    value always as 0.
  selftests: drv-net: test random value for hds-thresh

 net/ethtool/common.c                       |  1 +
 tools/testing/selftests/drivers/net/hds.py | 33 +++++++++++++++++++++-
 2 files changed, 33 insertions(+), 1 deletion(-)

-- 
2.34.1


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