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ethtool since version 6.9 introduced support for getting/setting RSS
input transformation supported in Linux since version 6.8.
The now changed kernel ioctl ABI, however, cannot be detected from
userland, and ethtool since version 6.9 simply assumes that a previously
reserved field is now used to set the input transformation.
Unfortunately the default value RXH_XFRM_NO_CHANGE (0xff) used by ethtool
userland creates an incompatibility with older kernels which cannot be
resolved easily without introducing even more ABI breakage.
Work-around the issue and fix support for --set-rxfh and --set-rxfh-indir
ethtool userland tool commands by making the support for input_xfrm
conditional on compile time, and keep it disabled for Linux 6.6.
Fixes: 8c2dcd1518 ("ethtool: update to 6.10")
Signed-off-by: Daniel Golle <daniel@makrotopia.org>