[{"id":3688612,"web_url":"http://patchwork.ozlabs.org/comment/3688612/","msgid":"","list_archive_url":null,"date":"2026-05-08T17:03:22","subject":"Re: [Intel-wired-lan] [PATCH iwl-next v1 14/15] ice: represent RSS\n LUTs as devlink resources","submitter":{"id":75597,"url":"http://patchwork.ozlabs.org/api/people/75597/","name":"Loktionov, Aleksandr","email":"aleksandr.loktionov@intel.com"},"content":"> -----Original Message-----\n> From: Kitszel, Przemyslaw \n> Sent: Friday, May 8, 2026 2:42 PM\n> To: intel-wired-lan@lists.osuosl.org; Schmidt, Michal\n> ; Jakub Kicinski ; Jiri Pirko\n> \n> Cc: netdev@vger.kernel.org; Simon Horman ; Nguyen,\n> Anthony L ; Michal Swiatkowski\n> ; Richardson, Bruce\n> ; Medvedkin, Vladimir\n> ; Connolly, Padraig J\n> ; S, Ananth ;\n> Miskell, Timothy ; Keller, Jacob E\n> ; Czapnik, Lukasz\n> ; Loktionov, Aleksandr\n> ; Andrew Lunn ;\n> David S. Miller ; Eric Dumazet\n> ; Paolo Abeni ; Saeed Mahameed\n> ; Leon Romanovsky ; Tariq Toukan\n> ; Mark Bloch ; Kitszel,\n> Przemyslaw \n> Subject: [PATCH iwl-next v1 14/15] ice: represent RSS LUTs as devlink\n> resources\n> \n> E800 family offers three kinds of RSS LUTs: VSI LUT (sized 64), GLOBAL\n> LUT (sized 256), and PF LUT (sized 2048). Until now the GLOBAL kind\n> was not used at all. There are two possible usages for it, subsequent\n> commit will give VF option to acquire it, and this one enables PF to\n> switch between PF LUT and GLOBAL LUT - switching to smaller one is,\n> again, to make it possible for VF to then acquire the former one.\n> \n> Devlink resources are used to let user show current usage and change\n> the allocation, see examples below.\n> \n> Default state on 8-port card, asking for aggregate \"whole device\"\n> usage, note that there are as many PF LUTs as there is PFs, and, for\n> e810, there are 16 GLOBAL LUTs:\n> $ devlink resource show devlink_index/11\n> devlink_index/11:\n> name rss size 8 unit entry size_min 0 size_max 24 size_gran 1\n> dpipe_tables none\n> resources:\n> name lut_512 size 0 unit entry size_min 0 size_max 16 size_gran\n> 1 dpipe_tables none\n> name lut_2048 size 8 unit entry size_min 0 size_max 8 size_gran\n> 1 dpipe_tables none\n> \n> Now let's add GLOBAL LUT for a single PF (on one-port NIC):\n> $ sudo devlink resource set pci/0000:18:00.0 path rss/lut_512 size 1\n> And show it's resources after that:\n> $ devlink resource show pci/0000:18:00.0\n> pci/0000:18:00.0:\n> name rss size 2 unit entry size_min 0 size_max 2 size_gran 1\n> dpipe_tables none\n> resources:\n> name lut_512 size 1 unit entry size_min 0 size_max 1 size_gran 1\n> dpipe_tables none\n> name lut_2048 size 1 unit entry size_min 0 size_max 1 size_gran\n> 1 dpipe_tables none Let's take the PF LUT out of that PF afterwards:\n> $ sudo devlink resource set pci/0000:18:00.0 path rss/lut_2048 size 0\n> now `ethtool -x $ifacename` will report smaller RSS table.\n> \n> Signed-off-by: Przemek Kitszel \n> ---\n> drivers/net/ethernet/intel/ice/Makefile | 1 +\n> .../net/ethernet/intel/ice/devlink/resource.h | 19 +\n> drivers/net/ethernet/intel/ice/ice_adapter.h | 40 ++\n> drivers/net/ethernet/intel/ice/ice_common.h | 1 +\n> .../net/ethernet/intel/ice/devlink/resource.c | 469\n> ++++++++++++++++++ drivers/net/ethernet/intel/ice/ice_adapter.c |\n> 12 +-\n> drivers/net/ethernet/intel/ice/ice_common.c | 2 +-\n> drivers/net/ethernet/intel/ice/ice_lib.c | 23 +-\n> drivers/net/ethernet/intel/ice/ice_main.c | 14 +-\n> 9 files changed, 573 insertions(+), 8 deletions(-) create mode\n> 100644 drivers/net/ethernet/intel/ice/devlink/resource.h\n> create mode 100644 drivers/net/ethernet/intel/ice/devlink/resource.c\n> \n> diff --git a/drivers/net/ethernet/intel/ice/Makefile\n> b/drivers/net/ethernet/intel/ice/Makefile\n> index 7f06d9bafe4a..0217ab6403de 100644\n> --- a/drivers/net/ethernet/intel/ice/Makefile\n> +++ b/drivers/net/ethernet/intel/ice/Makefile\n> @@ -37,6 +37,7 @@ ice-y := ice_main.o\t\\\n> \t devlink/devlink.o\t\\\n> \t devlink/health.o \\\n> \t devlink/port.o \\\n\n...\n\n> +\n> +static int ice_devl_res_take(struct ice_pf *pf,\n> +\t\t\t enum ice_devl_resource_id res_id, int slot,\n> +\t\t\t void *owner)\n> +{\n> +\tstruct ice_devl_resource *res = &pf->adapter-\n> >resources[res_id];\n> +\tint end = slot == ICE_ANY_SLOT ? res->max_size : slot + 1;\n> +\tint beg = slot == ICE_ANY_SLOT ? 0 : slot;\n> +\tint err, new_id = ICE_ANY_SLOT;\n> +\n> +\tfor (int id = beg; id < end; id++) {\n> +\t\tif (!res->owner[id]) {\n> +\t\t\tnew_id = id;\n> +\t\t\tbreak;\n> +\t\t}\n> +\t}\n> +\tif (new_id == ICE_ANY_SLOT)\n> +\t\treturn -ENOSPC;\n> +\n> +\tif (res_id == ICE_RSS_LUT_GLOBAL) {\n> +\t\tstruct ice_vsi *vsi;\n> +\t\tu16 lut_id;\n> +\n> +\t\terr = ice_alloc_rss_global_lut(&pf->hw, &lut_id);\n> +\t\tif (err)\n> +\t\t\treturn err;\n> +\t\tif (lut_id != new_id)\n> +\t\t\treturn -ENOANO;\n -ENOANO; looks for me very unusual choice.\nBTW won't LUT leak without calling ice_free_rss_global_lut() ? \n\n> +\n> +\t\tif (pf == owner)\n> +\t\t\tvsi = ice_get_main_vsi(pf);\n> +\t\telse\n> +\t\t\tvsi = ice_get_vf_vsi(owner);\n> +\n> +\t\tvsi->global_lut_id = new_id;\n> +\t}\n> +\n> +\tres->owner[new_id] = owner;\n> +\tres->pf_id[new_id] = pf->hw.pf_id;\n> +\treturn new_id;\n> +}\n\n...\n\n> \n> \treturn status;\n> }\n> --\n> 2.39.3","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=osuosl.org header.i=@osuosl.org header.a=rsa-sha256\n header.s=default header.b=UHlPGrNI;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=2605:bc80:3010::136; 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Miller\" ,\n Eric Dumazet , Paolo Abeni , \"Saeed\n Mahameed\" , Leon Romanovsky , \"Tariq\n Toukan\" , Mark Bloch ","Thread-Topic":"[PATCH iwl-next v1 14/15] ice: represent RSS LUTs as devlink\n resources","Thread-Index":"AQHc3uq0PmcPkxxC/EW+evaGPsRX/bYEWijw","Date":"Fri, 8 May 2026 17:03:22 +0000","Message-ID":"\n ","References":"<20260508124208.11622-1-przemyslaw.kitszel@intel.com>\n <20260508124208.11622-15-przemyslaw.kitszel@intel.com>","In-Reply-To":"<20260508124208.11622-15-przemyslaw.kitszel@intel.com>","Accept-Language":"en-US","Content-Language":"en-US","X-MS-Has-Attach":"","X-MS-TNEF-Correlator":"","x-ms-publictraffictype":"Email","x-ms-traffictypediagnostic":"IA3PR11MB8986:EE_|PH7PR11MB5888:EE_","x-ms-office365-filtering-correlation-id":"a26b8e38-91cd-4423-16ee-08dead23b656","x-ld-processed":"46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr","x-ms-exchange-senderadcheck":"1","x-ms-exchange-antispam-relay":"0","x-microsoft-antispam":"BCL:0;\n ARA:13230040|366016|376014|1800799024|7416014|56012099003|22082099003|18002099003|38070700021;","x-microsoft-antispam-message-info":"\n 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","x-forefront-antispam-report":"CIP:255.255.255.255; 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