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ethtool: work-around ETHTOOL_GRSSH/ETHTOOL_SRSSH ABI breakage

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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>
This commit is contained in:
Daniel Golle
2025-02-12 04:21:22 +00:00
parent da2cc98458
commit 3a7467ffde
2 changed files with 72 additions and 0 deletions
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5
package/network/utils/ethtool/Makefile
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@@ -57,6 +57,11 @@ else
CONFIGURE_ARGS += --disable-netlink --disable-pretty-dump
endif
# enable support for input_xfrm with kernels newer than 6.6
ifeq ($(CONFIG_LINUX_6_6),)
CONFIGURE_ARGS += --enable-rss-input-xfrm
endif
define Package/ethtool/install
$(INSTALL_DIR) $(1)/usr/sbin
$(INSTALL_BIN) $(PKG_BUILD_DIR)/ethtool $(1)/usr/sbin