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net: ena: return 0 in ena_get_rxfh_key_size() when RSS hash key is not configurable

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[ Upstream commit f017156aea60db8720e47591ed1e041993381ad2 ]

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 6a4f7dc82d1e ("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: 6a4f7dc82d1e ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kohei Enju 2025-09-29 14:02:22 +09:00 • committed by Greg Kroah-Hartman
commit 49f9f4c5cb
1 changed files with 4 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

5
drivers/net/ethernet/amazon/ena/ena_ethtool.c
View file

@ -633,7 +633,10 @@ static u32 ena_get_rxfh_indir_size(struct net_device *netdev)
static u32 ena_get_rxfh_key_size(struct net_device *netdev)
{
return ENA_HASH_KEY_SIZE;
struct ena_adapter *adapter = netdev_priv(netdev);
struct ena_rss *rss = &adapter->ena_dev->rss;
return rss->hash_key ? ENA_HASH_KEY_SIZE : 0;
}
static int ena_indirection_table_get(struct ena_adapter *adapter, u32 *indir)