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linux/drivers/net/ethernet/amazon
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Kohei Enju f017156aea net: ena: return 0 in ena_get_rxfh_key_size() when RSS hash key is not configurable 
In EC2 instances where the RSS hash key is not configurable, ethtool
shows bogus RSS hash key since ena_get_rxfh_key_size() unconditionally
returns ENA_HASH_KEY_SIZE.

Commit 6a4f7dc82d ("net: ena: rss: do not allocate key when not
supported") added proper handling for devices that don't support RSS
hash key configuration, but ena_get_rxfh_key_size() has been unchanged.

When the RSS hash key is not configurable, return 0 instead of
ENA_HASH_KEY_SIZE to clarify getting the value is not supported.

Tested on m5 instance families.

Without patch:
 # ethtool -x ens5 | grep -A 1 "RSS hash key"
 RSS hash key:
 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00

With patch:
 # ethtool -x ens5 | grep -A 1 "RSS hash key"
 RSS hash key:
 Operation not supported

Fixes: 6a4f7dc82d ("net: ena: rss: do not allocate key when not supported")
Signed-off-by: Kohei Enju <enjuk@amazon.com>
Link: https://patch.msgid.link/20250929050247.51680-1-enjuk@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
History 2025-09-29 18:33:53 -07:00
..
ena net: ena: return 0 in ena_get_rxfh_key_size() when RSS hash key is not configurable 2025-09-29 18:33:53 -07:00
Kconfig net: ena: Add device reload capability through devlink 2025-06-18 18:57:28 -07:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00