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    "msgid": "<20260316072053.1241987-1-aleksandr.loktionov@intel.com>",
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    "date": "2026-03-16T07:20:51",
    "name": "[iwl-next,v5,0/2] ice: implement symmetric RSS hash configuration",
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        "name": "Loktionov, Aleksandr",
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            "date": "2026-03-16T07:20:52",
            "name": "ice: implement symmetric RSS hash configuration",
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        "From": "Aleksandr Loktionov <aleksandr.loktionov@intel.com>",
        "To": "intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,\n anthony.l.nguyen@intel.com, aleksandr.loktionov@intel.com",
        "Date": "Mon, 16 Mar 2026 08:20:51 +0100",
        "Message-ID": "<20260316072053.1241987-1-aleksandr.loktionov@intel.com>",
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        ],
        "Subject": "[Intel-wired-lan] [PATCH iwl-next v5 0/2] ice: implement symmetric\n RSS hash configuration",
        "X-BeenThere": "intel-wired-lan@osuosl.org",
        "X-Mailman-Version": "2.1.30",
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        "List-Id": "Intel Wired Ethernet Linux Kernel Driver Development\n <intel-wired-lan.osuosl.org>",
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    },
    "content": "The ice driver has advertised symmetric RSS support via\nsupported_input_xfrm since the capability was added, but ice_set_rxfh()\nignored the input_xfrm parameter entirely, so enabling symmetric hashing\nhad no actual effect.\n\nThis series fixes that.  Patch 1 extends the ethtool core so that\ndrivers hashing GTP flows on TEID can report it honestly without\nblocking symmetric-xor configuration.  Patch 2 wires up the ice driver.\n\nThe need for patch 1 surfaced because GTP flow profiles in ice always\ninclude TEID in the hash.  ethtool_check_flow_types() calls\nget_rxfh_fields() for every hashable flow type before allowing\nsymmetric-xor; ethtool_rxfh_config_is_sym() rejected any bitmap\ncontaining RXH_GTP_TEID since it has no src/dst counterpart.  TEID\nis the same value in both tunnel directions, so this rejection is\nincorrect: including it does not break symmetry.\n\nRather than hiding TEID from the reported fields (which would silently\nmisrepresent hardware behaviour), patch 1 fixes the validator, and\npatch 2 reports TEID honestly.\n\nTested with tools/testing/selftests/drivers/net/hw/rss_input_xfrm.py\non an E810 card running kernel 6.19-rc8.\n\n---\nv4 -> v5:\n - remove redundant (u64) type conversion\n\nv3 -> v4:\n - Drop the ICE_HASH_INVALID fallback in ice_get_rxfh_fields() that\n   fabricated default L3+L4 hash fields when no hardware RSS config\n   exists for a flow type; returning zero fields is more honest and\n   avoids misrepresenting hardware state\n - Drop the companion \"if (!l3 && !l4)\" special case in the\n   pair-completion block; it was only necessary to cover the synthetic\n   defaults added by the fallback, which is now gone\n - No functional change to ice_set_rxfh() or the ethtool core patch\n\nv2 -> v3:\n - Split into 2 patches: ethtool core fix separate from driver change\n - Drop the RXH_GTP_TEID stripping workaround from the driver; instead\n   fix ethtool_rxfh_config_is_sym() to accept TEID as intrinsically\n   symmetric (patch 1)\n - Fix ice_get_rxfh_fields(): the v2 unconditional assignment\n   \"nfc->data = ICE_RSS_ALLOWED_FIELDS\" clobbered fields set earlier in\n   the same function; replaced with pair-completion using |= so only\n   the missing half of a partial pair is filled in\n - Remove ICE_RSS_ALLOWED_FIELDS define (no longer needed)\n - Report RXH_GTP_TEID honestly for GTP flow types\n\nv1 -> v2:\n - Preserve valid symmetric RSS fields instead of overwriting nfc->data\n   unconditionally\n\nAleksandr Loktionov (2):\n  ethtool: treat RXH_GTP_TEID as intrinsically symmetric\n  ice: implement symmetric RSS hash configuration\n\n drivers/net/ethernet/intel/ice/ice_ethtool.c | 40 +++++++++++++---\n drivers/net/ethernet/intel/ice/ice_lib.c     |  7 ++--\n drivers/net/ethernet/intel/ice/ice_lib.h     |  1 +\n net/ethtool/common.c                         |  3 +++\n 4 files changed, 40 insertions(+), 11 deletions(-)"
}