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ETHTOOL_A_RSS_HFUNC and ETHTOOL_A_RSS_INPUT_XFRM are NLA_U32 attributes, but ethnl_rss_set() and ethnl_rss_create_doit() parse them with ethnl_update_u8(), which reads a single byte. On little endian this happens to read the least significant byte and works as long as the value fits in a byte. On big endian it reads the most significant byte, so the requested value is parsed incorrectly. The destination fields in struct ethtool_rxfh_param are u8, so the attribute can't be read directly with ethnl_update_u32(). Cap the hfunc policy at U8_MAX so an out of range value is rejected instead of being silently truncated into the u8 field, and add ethnl_update_u8_u32() to read the full u32 and narrow it into the u8 destination. Fixes:82ae67cbc4("ethtool: rss: support setting hfunc via Netlink") Fixes:d3e2c7bab1("ethtool: rss: support setting input-xfrm via Netlink") Fixes:a166ab7816("ethtool: rss: support creating contexts via Netlink") Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com> Reviewed-by: Nimrod Oren <noren@nvidia.com> Signed-off-by: Gal Pressman <gal@nvidia.com> Link: https://patch.msgid.link/20260706055017.3355806-1-gal@nvidia.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>