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| author | Ahmed Zaki <ahmed.zaki@intel.com> | 2023-12-13 03:33:16 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-12-14 09:07:16 +0300 |
| commit | 13e59344fb9d3c9d3acd138ae320b5b67b658694 (patch) | |
| tree | 3f7a839e6f1077c04088aa3cdafa18e659357821 /Documentation/networking/ethtool-netlink.rst | |
| parent | dcd8dbf9e734eb334113ea43186c1c26e9f497bb (diff) | |
| download | linux-13e59344fb9d3c9d3acd138ae320b5b67b658694.tar.xz | |
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/networking/ethtool-netlink.rst')
| -rw-r--r-- | Documentation/networking/ethtool-netlink.rst | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst index 6a49624a9cbf..d583d9abf2f8 100644 --- a/Documentation/networking/ethtool-netlink.rst +++ b/Documentation/networking/ethtool-netlink.rst @@ -1774,12 +1774,16 @@ Kernel response contents: ``ETHTOOL_A_RSS_HFUNC`` u32 RSS hash func ``ETHTOOL_A_RSS_INDIR`` binary Indir table bytes ``ETHTOOL_A_RSS_HKEY`` binary Hash key bytes + ``ETHTOOL_A_RSS_INPUT_XFRM`` u32 RSS input data transformation ===================================== ====== ========================== ETHTOOL_A_RSS_HFUNC attribute is bitmap indicating the hash function being used. Current supported options are toeplitz, xor or crc32. -ETHTOOL_A_RSS_INDIR attribute returns RSS indrection table where each byte +ETHTOOL_A_RSS_INDIR attribute returns RSS indirection table where each byte indicates queue number. +ETHTOOL_A_RSS_INPUT_XFRM attribute is a bitmap indicating the type of +transformation applied to the input protocol fields before given to the RSS +hfunc. Current supported option is symmetric-xor. PLCA_GET_CFG ============ |