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| author | Ahmed Zaki <ahmed.zaki@intel.com> | 2023-12-12 17:33:16 -0700 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-12-13 22:07:16 -0800 |
| commit | 13e59344fb9d3c9d3acd138ae320b5b67b658694 (patch) | |
| tree | 3f7a839e6f1077c04088aa3cdafa18e659357821 /Documentation/netlink | |
| parent | dcd8dbf9e734eb334113ea43186c1c26e9f497bb (diff) | |
| download | linux-13e59344fb9d3c9d3acd138ae320b5b67b658694.tar.gz | |
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 <hash_alg> symmetric-xor
or turn symmetry off (asymmetric) by:
# ethtool -X eth0 hfunc <hash_alg>
The specific fields for each flow type should then be specified as usual
via:
# ethtool -N|-U eth0 rx-flow-hash <flow_type> s|d|f|n
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Signed-off-by: Ahmed Zaki <ahmed.zaki@intel.com>
Link: https://lore.kernel.org/r/20231213003321.605376-4-ahmed.zaki@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'Documentation/netlink')
| -rw-r--r-- | Documentation/netlink/specs/ethtool.yaml | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/netlink/specs/ethtool.yaml b/Documentation/netlink/specs/ethtool.yaml index 5c7a65b009b429..197208f419dce6 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 |