From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 774EBEB64D8 for ; Tue, 13 Jun 2023 15:20:41 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id 0B2694002C; Tue, 13 Jun 2023 15:20:41 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp4.osuosl.org 0B2694002C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=osuosl.org; s=default; t=1686669641; bh=5SEBDM2GzU+YxnAcFa6A8ezqPklSPQc3Gzdh3D1GruI=; h=Date:From:To:References:In-Reply-To:Subject:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: Cc:From; b=Agr8h7yK6a5yRhmZ+dZthrT1PRCAlsol/vF7dwOYIb1AX/pQdEtJwNP/rjnfrtujh 9QlQIUXVlyNmiXWguImxv54Qr22lyFnZAkfhKJ3x6pvCtQzA8kgSqaPz7962G0G+1u K0flDnIusAZ5UlicCLP2l+WDPXGvZyp0p6QOkHM5wXzH41CETg0nOTzc8uv+R1XTpT Xul8tbQUhPpMvi7ixTq5u/XjnnB1g1ZH1pPHPNPguJrqWm7Whxwa1o5Zc8V0nLw01R BrKpFMkYlxWRCJ0ZR+q7FpgfG3o9JuNO/n9byvMe8fzBOdJTiF90WfnUUGnFxVVLyf jvxE6Ox/L3QhQ== X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YFv2qgDoaTmv; Tue, 13 Jun 2023 15:20:38 +0000 (UTC) Received: from ash.osuosl.org (ash.osuosl.org [140.211.166.34]) by smtp4.osuosl.org (Postfix) with ESMTP id 59A6740238; Tue, 13 Jun 2023 15:20:38 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp4.osuosl.org 59A6740238 Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by ash.osuosl.org (Postfix) with ESMTP id E3D3F1BF34B for ; Tue, 13 Jun 2023 15:20:36 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id C83BC60BA3 for ; Tue, 13 Jun 2023 15:20:36 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp3.osuosl.org C83BC60BA3 X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lARn7y3ElvP4 for ; Tue, 13 Jun 2023 15:20:35 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp3.osuosl.org 8077460B3B Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by smtp3.osuosl.org (Postfix) with ESMTPS id 8077460B3B for ; Tue, 13 Jun 2023 15:20:35 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6600,9927,10740"; a="444735855" X-IronPort-AV: E=Sophos;i="6.00,240,1681196400"; d="scan'208";a="444735855" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Jun 2023 08:20:34 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10740"; a="662047097" X-IronPort-AV: E=Sophos;i="6.00,240,1681196400"; d="scan'208";a="662047097" Received: from fmsmsx603.amr.corp.intel.com ([10.18.126.83]) by orsmga003.jf.intel.com with ESMTP; 13 Jun 2023 08:20:34 -0700 Received: from fmsmsx612.amr.corp.intel.com (10.18.126.92) by fmsmsx603.amr.corp.intel.com (10.18.126.83) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.23; Tue, 13 Jun 2023 08:20:33 -0700 Received: from fmsmsx611.amr.corp.intel.com (10.18.126.91) by fmsmsx612.amr.corp.intel.com (10.18.126.92) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.23; Tue, 13 Jun 2023 08:20:33 -0700 Received: from fmsedg601.ED.cps.intel.com (10.1.192.135) by fmsmsx611.amr.corp.intel.com (10.18.126.91) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.23 via Frontend Transport; Tue, 13 Jun 2023 08:20:33 -0700 Received: from NAM12-MW2-obe.outbound.protection.outlook.com (104.47.66.41) by edgegateway.intel.com (192.55.55.70) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.23; Tue, 13 Jun 2023 08:20:33 -0700 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=CVwH++wyDorcfXkkHjBaGi7I5RtAIuszgYI/n4HaVEi2F/god1wJ+YJxCzSxJ3rfff4JybQ+VEvdA0wtz79NhS996bOCIwiHjKlffQs7ChDQYJ/UlsfniZBG7Js3Qet2s5TY1jE71V7ENcSNyP7+/dbemC5d/oRwXgOHBkfFYCgeolixCR0Gq6FSs7qUjlL5aoZrVcxtJF3sj+KvhWHUR1irINNKta45O4rq79GBaU7RfOQqsASX/CyFsAWNre54ogInz1VnVejCJZB47ZPJ5eNR4IRDrDKRAXaejwQtdFp/SRsaUqJkm2Chw0EDJQ+XRZcY9anmAD6DWQihwIeqtw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=DHpcspzRTAJYhxdrjDD5ph3zN5+LnFWTe41y3+/lBAY=; b=nMs5yl5Y/ljsORPJO/Y9ANCZVxmjN0akMVq0ZBlCzrs4P12tfQVmEV66QHrFT9hWiIAqiqf72+lSog0sJcGAILCWtKgZUzqj7T9GUW9UA5HXmtAS0Sf7n5SNfIgj7Y0QOA8wb28zNNG7XjBjomF0SQBoY2WuHy5PUnXl483UYHGNTuk7xWb+zh94cooAHc6Y3cKlHN+Y/KgrG2XM1y5/QdSlsv24B5Vt5z4FuL9vgSUd8syCAFM6bAa74dc0XKe4u0+OGCPABJ9JhR/YyLzsAgR773i7NgYq+/NbpeEFZ1dw6YLJBXHRZy8E9rQzWh8LlfsuB19q070z61aC+d4ztg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none Received: from DM4PR11MB6117.namprd11.prod.outlook.com (2603:10b6:8:b3::19) by SA1PR11MB6735.namprd11.prod.outlook.com (2603:10b6:806:25e::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6455.39; Tue, 13 Jun 2023 15:20:31 +0000 Received: from DM4PR11MB6117.namprd11.prod.outlook.com ([fe80::9e4f:80cc:e0aa:6809]) by DM4PR11MB6117.namprd11.prod.outlook.com ([fe80::9e4f:80cc:e0aa:6809%2]) with mapi id 15.20.6477.028; Tue, 13 Jun 2023 15:20:31 +0000 Date: Tue, 13 Jun 2023 17:20:25 +0200 From: Maciej Fijalkowski To: Alexander Lobakin Message-ID: References: <20230613151005.337462-1-maciej.fijalkowski@intel.com> <9eee635f-0898-f9d3-f3ba-f6da662c90cc@intel.com> Content-Disposition: inline In-Reply-To: <9eee635f-0898-f9d3-f3ba-f6da662c90cc@intel.com> X-ClientProxiedBy: FR2P281CA0171.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:99::16) To DM4PR11MB6117.namprd11.prod.outlook.com (2603:10b6:8:b3::19) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR11MB6117:EE_|SA1PR11MB6735:EE_ X-MS-Office365-Filtering-Correlation-Id: 150c0cc0-ce75-441e-9003-08db6c21b9e9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:DM4PR11MB6117.namprd11.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230028)(7916004)(346002)(39860400002)(376002)(366004)(136003)(396003)(451199021)(316002)(966005)(6486002)(41300700001)(33716001)(186003)(83380400001)(107886003)(86362001)(44832011)(26005)(6506007)(6512007)(2906002)(9686003)(82960400001)(38100700002)(5660300002)(8936002)(6862004)(8676002)(66946007)(478600001)(66556008)(66476007)(6636002)(6666004)(4326008)(67856001)(309714004); DIR:OUT; SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?vJscERReCVn8Ubku7PHOzvpXqHk9AW/JV+58+st/3HzsaDteBJ6Mcu8BOJ5X?= =?us-ascii?Q?3nVb2TjaOpLcNFGaRcpC7u+Y/6oSMAXZVKE0+ibB/eQg7kQEnq/surCCIafC?= =?us-ascii?Q?VR7aOhi9CC0X1/69rPoZn/rfDrwUJkQwTw/D1Oegpo5MUOJ/YU0DUsd1NA/X?= =?us-ascii?Q?vn1XBqWiR/8R08eS1fgsIH05C7czdggsv5Ufx1kKZAm+X75m3EhGCdePDg83?= =?us-ascii?Q?Q8L6Mw8X5l7/96YxRSchZSvA++xvPx+233vInl8Femz2LDofdqe1nANOnbeG?= =?us-ascii?Q?jxDgdw8M6alrsQp638iMZz/bfggr6AWeDiXIXQsQU2imfYPG8/pAVPQJClsB?= =?us-ascii?Q?TVPuDWpaVSkImoGPOQAeAc8sg6QEM5xlW1L9M77AYuePC8xfTb72eIKjd4Gv?= =?us-ascii?Q?uJ2tOgeR1+AGdMQzniuRylq62r025IEEHRluW64ltn/8ta9a7LVPGFM86k3f?= =?us-ascii?Q?qMOtZ37M04GUvu0nKm4n8nyDCNOtseFY+kdBZIEi9mFwyPqiyxbvD6MzjOey?= =?us-ascii?Q?/EjDUEO/wqTZ9RwlbsBcroydpQMQ7m0dQZzBMwCh7T69HBD24Zm41INGxmTt?= =?us-ascii?Q?dPBmar30VcAswsJBYgJOs5NrL40VaMIyyqsTsjnkQFkAkraBRQLxOPSNN6Rs?= =?us-ascii?Q?rEXyFa/l50svkZ8zMVwdtemwp6WP/fwV3D+GKBHEwjvZehSsT2l6BSIHJBWi?= =?us-ascii?Q?qd+GukUnm2kjltppLO6r8M8A7eEWTT3supdQiG2IL4mNS7DCDFFkQYrUhvhR?= =?us-ascii?Q?87ax0Zb8+JtMPExELNKaFGzp6Q9AMbXILSOyeuWfnRQpR0+wLX+VNPANjxMu?= =?us-ascii?Q?ETMxOLk7OmPB2IN3UU8BuQXEtV1azeVctzJ5TMCRP+e0LjXrk6/5sgC0RIAB?= =?us-ascii?Q?D533aFtMNbAF/GhuEyPcdBJGOAEuVN9JfgNHhKMjF9kDBllZWiRTvLaqACAE?= =?us-ascii?Q?krkTX2Fwku5Ma6zDoXzUJDkloGO8+QR0vEdvv7XHEDlGcdKaHKuigW924e1c?= =?us-ascii?Q?cubVzEUxVlRb+IKuaq+w5xm8gaffK6qwD7Ka11pQ+lklrzFB0kK/IdOYzl7j?= =?us-ascii?Q?MVVAZQVgrE3Rnud6Qsjg8v+MfEuy5SpJHUSfZALx3VQ1ahKOet45MKgBVUCl?= =?us-ascii?Q?pqIfwf8ImiE2fqeckvh5LnS8k2tSGFxayfesMERF3RIEVKdMsDAqi66NWHbB?= =?us-ascii?Q?TSW9LutXPYUzqL6pBdkEU6yGqEWyf6J8Tn3oRrb7NqKX20eZzr4oo9UuFG/C?= =?us-ascii?Q?Y98nUzabotU0cYYtcYihY1/ODbA7PFbzGBFDtoSt96j8YoTO+wIBPf27Qtt8?= =?us-ascii?Q?eW/yDr1FmoJWCXVZVXk9qXOa+BYBXqAy58gdhucME40w18rxLS7H2EILJfOV?= =?us-ascii?Q?Ef4XAf2Hg6upBvrmSAh4rrLGdhU+tfVZVhmzgDPtUolsgBCvZkJp+bV0MDbC?= =?us-ascii?Q?TEHPsrUFUjeHI3jpMSfz3P5y28JqA+537E+GrtD8eCmNrrpFqRiQNUgx4Tcu?= =?us-ascii?Q?O9xcg6XJt0wExBh+mehpsYZ2OLiX8F3gau680DmazfpJd1ZVElnDZB0DY8eZ?= =?us-ascii?Q?E3owI445VrVsd82qeHwReMffMrZg/lNhVl2pAaEg0IaFstbXV72qXGqQWo7p?= =?us-ascii?Q?kA=3D=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: 150c0cc0-ce75-441e-9003-08db6c21b9e9 X-MS-Exchange-CrossTenant-AuthSource: DM4PR11MB6117.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Jun 2023 15:20:31.3304 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 1FJmxQUHCyCNBmlhmkFgotcK38L9WppcCeVEhBh1vr/uLnokZV8L/JFx/yRrXhZmaYGpgoiaW/NDD7oCfEVaL3eKf0xaEj9XbBJ7Vaw+khU= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR11MB6735 X-OriginatorOrg: intel.com X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1686669635; x=1718205635; h=date:from:to:cc:subject:message-id:references: in-reply-to:mime-version; bh=IgbmkfuwWR1kT4isqTWhqZXq0TDPxqSzQuKQ6BAj64o=; b=DltXcmKPEBiCH6MyX6IWXb/EtVS+7DJ5X7MLofNe394rLFQK9HjO0sku +fQt++hekyfjEB2K88/OQudWaNbzdAGn/IE+IpUILsZcATH+Quf978YDM ggT+zb1SCMuH1ozoAMT+FjHwVfYIoZD4bMQN4MyFgEw0P4S+AMTBVL3Pg wWHf29Wrf5XEm5dIDLfT3mPgZJFIo33YrNmOF+3nVc/dn49MNfi7KMqf8 TUZCDnUEIdksFXq4IaFKRBa8QynWhWK7mowIVjB1DcBKo1FD6FCgi+j1X YjU+Bw47Mj1Mnzm3UpaYLxOiJDKpzO+xv5aGBt3ecd1tsfVVSjZBS/zg2 w==; X-Mailman-Original-Authentication-Results: smtp3.osuosl.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=DltXcmKP X-Mailman-Original-Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; Subject: Re: [Intel-wired-lan] [PATCH iwl-next] ice: allow hot-swapping XDP programs X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: netdev@vger.kernel.org, anthony.l.nguyen@intel.com, intel-wired-lan@lists.osuosl.org, magnus.karlsson@intel.com, fred@cloudflare.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On Tue, Jun 13, 2023 at 05:15:15PM +0200, Alexander Lobakin wrote: > From: Maciej Fijalkowski > Date: Tue, 13 Jun 2023 17:10:05 +0200 > > > Currently ice driver's .ndo_bpf callback brings the interface down and > > up independently of the presence of XDP resources. This is only needed > > when either these resources have to be configured or removed. It means > > that if one is switching XDP programs on-the-fly with running traffic, > > packets will be dropped. > > > > To avoid this, compare early on ice_xdp_setup_prog() state of incoming > > bpf_prog pointer vs the bpf_prog pointer that is already assigned to > > VSI. Do the swap in case VSI has bpf_prog and incoming one are non-NULL. > > > > Signed-off-by: Maciej Fijalkowski > > [0] :D > > But if be serious, are you sure you won't have any pointer tears / > partial reads/writes without such RCU protection as added in the > linked commit ? Since we removed rcu sections from driver sides and given an assumption that local_bh_{dis,en}able() pair serves this purpose now i believe this is safe. Are you aware of: https://lore.kernel.org/bpf/20210624160609.292325-1-toke@redhat.com/ ? > > > --- > > drivers/net/ethernet/intel/ice/ice_main.c | 12 +++++------- > > 1 file changed, 5 insertions(+), 7 deletions(-) > > > > diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c > > index a1f7c8edc22f..8940ee505811 100644 > > --- a/drivers/net/ethernet/intel/ice/ice_main.c > > +++ b/drivers/net/ethernet/intel/ice/ice_main.c > > @@ -2922,6 +2922,11 @@ ice_xdp_setup_prog(struct ice_vsi *vsi, struct bpf_prog *prog, > > "MTU is too large for linear frames and XDP prog does not support frags"); > > return -EOPNOTSUPP; > > } > > + > > + /* hot swap progs and avoid toggling link */ > > + if (ice_is_xdp_ena_vsi(vsi) == !!prog) { > > + ice_vsi_assign_bpf_prog(vsi, prog); > > + return 0; > > } > > > > /* need to stop netdev while setting up the program for Rx rings */ > > @@ -2956,13 +2961,6 @@ ice_xdp_setup_prog(struct ice_vsi *vsi, struct bpf_prog *prog, > > xdp_ring_err = ice_realloc_zc_buf(vsi, false); > > if (xdp_ring_err) > > NL_SET_ERR_MSG_MOD(extack, "Freeing XDP Rx resources failed"); > > - } else { > > - /* safe to call even when prog == vsi->xdp_prog as > > - * dev_xdp_install in net/core/dev.c incremented prog's > > - * refcount so corresponding bpf_prog_put won't cause > > - * underflow > > - */ > > - ice_vsi_assign_bpf_prog(vsi, prog); > > } > > > > if (if_running) > > [0] > https://github.com/alobakin/linux/commit/5645adb0943dabeadfb9f6d00202c78fb9594fbe > > Thanks, > Olek _______________________________________________ Intel-wired-lan mailing list Intel-wired-lan@osuosl.org https://lists.osuosl.org/mailman/listinfo/intel-wired-lan