From 13e59344fb9d3c9d3acd138ae320b5b67b658694 Mon Sep 17 00:00:00 2001 From: Ahmed Zaki Date: Tue, 12 Dec 2023 17:33:16 -0700 Subject: net: ethtool: add support for symmetric-xor RSS hash Symmetric RSS hash functions are beneficial in applications that monitor both Tx and Rx packets of the same flow (IDS, software firewalls, ..etc). Getting all traffic of the same flow on the same RX queue results in higher CPU cache efficiency. A NIC that supports "symmetric-xor" can achieve this RSS hash symmetry by XORing the source and destination fields and pass the values to the RSS hash algorithm. The user may request RSS hash symmetry for a specific algorithm, via: # ethtool -X eth0 hfunc symmetric-xor or turn symmetry off (asymmetric) by: # ethtool -X eth0 hfunc The specific fields for each flow type should then be specified as usual via: # ethtool -N|-U eth0 rx-flow-hash s|d|f|n Reviewed-by: Wojciech Drewek Signed-off-by: Ahmed Zaki Link: https://lore.kernel.org/r/20231213003321.605376-4-ahmed.zaki@intel.com Signed-off-by: Jakub Kicinski --- Documentation/netlink/specs/ethtool.yaml | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'Documentation/netlink') diff --git a/Documentation/netlink/specs/ethtool.yaml b/Documentation/netlink/specs/ethtool.yaml index 5c7a65b009b4..197208f419dc 100644 --- a/Documentation/netlink/specs/ethtool.yaml +++ b/Documentation/netlink/specs/ethtool.yaml @@ -908,6 +908,9 @@ attribute-sets: - name: hkey type: binary + - + name: input_xfrm + type: u32 - name: plca attributes: @@ -1598,6 +1601,7 @@ operations: - hfunc - indir - hkey + - input_xfrm dump: *rss-get-op - name: plca-get-cfg -- cgit v1.2.3