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Add a selftest under tools/testing/selftests/drivers/net/rss_key.py
checking both the host RSS key (/proc/sys/net/core/netdev_rss_key) and
the RSS key, indirection table, and flow-hash layouts reported by a
device over ethtool netlink.
When invoked without NETIF, NetDrvEnv creates a 4-queue netdevsim device,
which calls netdev_rss_key_fill() and allows exercising both the host key
and the netlink RSS reporting path in a virtual machine without special
hardware. When invoked with NETIF, it checks the key and indirection
table of that interface.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260922163458.3900996-5-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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