[PATCH iwl-net v2 0/1] ice: Fix persistent failure in ice_get_rxfh

[Cody Haas <chaas@riotgames.com>]

Hey all,

This is a small bug fix for an issue I found when testing some e810 NICs
on kernel 6.16.5-200.fc42.x86_64. I originally reported the bug in
https://lore.kernel.org/intel-wired-lan/CAH7f-UKkJV8MLY7zCdgCrGE55whRhbGAXvgkDnwgiZ9gUZT7_w@mail.gmail.com/

User Impact of the Bug
----------------------
In the current in-tree ice driver, if a user tries to get the
indirection table using the SIOCETHTOOL command and the
ETHTOOL_GRXFHINDIR subcommand the subsequent function call with always
fail with -EINVAL. 

Cause of the Bug
----------------
When a user gets the indirection table using SIOCETHTOOL and ETHTOOL_GRXFHINDIR
ethtool_get_rxfh_indir is called. This function will end up calling
ice_get_rxfh which then calls ice_get_rss_key. The function
ice_get_rss_key expects its *seed parameter to never be null. This *seed
parameter is the key field in ethtool_rxfh_param. Neither ice_get_rxfh
nor ethtool_get_rxfh_indir set this value, so it will always be null.
This causes the *seed parameter for ice_get_rss_key to always be null,
ultimately causing ice_get_rss_key to always return -EINVAL.

Fix for the Bug
---------------
To fix this, I went ahead and implemented ice_get_rss which checks if
the rss_key is not null before calling ice_key_rss_key. This follows
suit with the i40e driver's implementation.

Cody Haas (1):
  ice: Fix persistent failure in ice_get_rxfh

 drivers/net/ethernet/intel/ice/ice.h         |  1 +
 drivers/net/ethernet/intel/ice/ice_ethtool.c |  6 +----
 drivers/net/ethernet/intel/ice/ice_main.c    | 28 ++++++++++++++++++++
 3 files changed, 30 insertions(+), 5 deletions(-)

base-commit: 67181985211850332c8ff942815c1961fd7058b9
-- 
2.51.1