From: Jakub Kicinski Date: Thu, 17 Jul 2025 23:43:36 +0000 (-0700) Subject: ethtool: assert that drivers with sym hash are consistent for RSS contexts X-Git-Tag: v6.17-rc1~126^2~52^2~7 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=80e55735d5a5a1f765e807d4c38027039f48302f;p=thirdparty%2Flinux.git ethtool: assert that drivers with sym hash are consistent for RSS contexts Supporting per-RSS context configuration of hashing fields but not the hashing algorithm would complicate the code a lot. We'd need to cross check the config against all RSS contexts. None of the drivers need this today, so explicitly prevent new drivers with such skewed capabilities from registering. If such driver appears it will need to first adjust the checks in the core. Link: https://patch.msgid.link/20250717234343.2328602-2-kuba@kernel.org Signed-off-by: Jakub Kicinski --- diff --git a/net/ethtool/common.c b/net/ethtool/common.c index 4dcb4194f3ce1..82afe0f2a7cd6 100644 --- a/net/ethtool/common.c +++ b/net/ethtool/common.c @@ -829,6 +829,10 @@ int ethtool_check_ops(const struct ethtool_ops *ops) return -EINVAL; if (WARN_ON(ops->supported_input_xfrm && !ops->get_rxfh_fields)) return -EINVAL; + if (WARN_ON(ops->supported_input_xfrm && + ops->rxfh_per_ctx_fields != ops->rxfh_per_ctx_key)) + return -EINVAL; + /* NOTE: sufficiently insane drivers may swap ethtool_ops at runtime, * the fact that ops are checked at registration time does not * mean the ops attached to a netdev later on are sane.