[{"id":1761940,"web_url":"http://patchwork.ozlabs.org/comment/1761940/","msgid":"","list_archive_url":null,"date":"2017-09-01T19:25:57","subject":"Re: [net-next PATCH] bpf: sockmap update/simplify memory accounting\n\tscheme","submitter":{"id":68234,"url":"http://patchwork.ozlabs.org/api/people/68234/","name":"Alexei Starovoitov","email":"ast@fb.com"},"content":"On 9/1/17 11:29 AM, John Fastabend wrote:\n> Instead of tracking wmem_queued and sk_mem_charge by incrementing\n> in the verdict SK_REDIRECT paths and decrementing in the tx work\n> path use skb_set_owner_w and sock_writeable helpers. This solves\n> a few issues with the current code. First, in SK_REDIRECT inc on\n> sk_wmem_queued and sk_mem_charge were being done without the peers\n> sock lock being held. Under stress this can result in accounting\n> errors when tx work and/or multiple verdict decisions are working\n> on the peer psock.\n>\n> Additionally, this cleans up the code because we can rely on the\n> default destructor to decrement memory accounting on kfree_skb. Also\n> this will trigger sk_write_space when space becomes available on\n> kfree_skb() which wasn't happening before and prevent __sk_free\n> from being called until all in-flight packets are completed.\n>\n> Fixes: 174a79ff9515 (\"bpf: sockmap with sk redirect support\")\n> Signed-off-by: John Fastabend \n> Acked-by: Daniel Borkmann \n\nthanks. it's cleaner indeed.\n\nAcked-by: Alexei Starovoitov ","headers":{"Return-Path":"","X-Original-To":"patchwork-incoming@ozlabs.org","Delivered-To":"patchwork-incoming@ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; helo=vger.kernel.org;\n\tenvelope-from=netdev-owner@vger.kernel.org;\n\treceiver=)","ozlabs.org; dkim=pass (1024-bit key;\n\tunprotected) header.d=fb.com header.i=@fb.com header.b=\"MhY/TjGI\";\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=fb.onmicrosoft.com header.i=@fb.onmicrosoft.com\n\theader.b=\"Hg69Oru9\"; 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a=rsa-sha256; c=relaxed/relaxed; d=fb.onmicrosoft.com; \n\ts=selector1-fb-com;\n\th=From:Date:Subject:Message-ID:Content-Type:MIME-Version; \n\tbh=Xd/xWk21/l7t2ummG36h+H2GfGe4VYtl45iV1HRU6/M=;\n\tb=Hg69Oru97tY2L0xhQYb7LsoAamGOmCZjVJMq1hCE1rVZ6/y0CJD3giSf8oA9DYkxqzcuR6rPDCmLNNIDW9e43uh8zqR4yFdCln0LcbyxEhE+rPijrB8ifBl6L3c2KSQ440bAju8EWZcK6m2ZGNDBpQ//GgSkL/uLDUStf/ZbmDg="],"Subject":"Re: [net-next PATCH] bpf: sockmap update/simplify memory accounting\n\tscheme","To":"John Fastabend , ","References":"<20170901182926.8981.77450.stgit@john-Precision-Tower-5810>","CC":", ","From":"Alexei Starovoitov ","Message-ID":"","Date":"Fri, 1 Sep 2017 12:25:57 -0700","User-Agent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:45.0)\n\tGecko/20100101 Thunderbird/45.8.0","MIME-Version":"1.0","In-Reply-To":"<20170901182926.8981.77450.stgit@john-Precision-Tower-5810>","Content-Type":"text/plain; charset=\"utf-8\"; format=flowed","Content-Transfer-Encoding":"7bit","X-Originating-IP":"[2620:10d:c090:200::7:53b5]","X-ClientProxiedBy":"BN6PR18CA0011.namprd18.prod.outlook.com\n\t(2603:10b6:404:121::21) To SN2PR15MB0975.namprd15.prod.outlook.com\n\t(2603:10b6:804:20::25)","X-MS-PublicTrafficType":"Email","X-MS-Office365-Filtering-Correlation-Id":"dbc5f618-3088-4ed6-c170-08d4f16f4755","X-Microsoft-Antispam":"UriScan:; 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SFP:1102; SCL:1; SRVR:SN2PR15MB0975;\n\tH:[IPv6:2620:10d:c082:1055:600e:7c4f:2b57:a9b0]; FPR:;\n\tSPF:None; PTR:InfoNoRecords; MX:1; A:1; LANG:en; ","Received-SPF":"None (protection.outlook.com: fb.com does not designate\n\tpermitted sender hosts)","SpamDiagnosticOutput":"1:99","SpamDiagnosticMetadata":"NSPM","X-MS-Exchange-CrossTenant-OriginalArrivalTime":"01 Sep 2017 19:25:59.9361\n\t(UTC)","X-MS-Exchange-CrossTenant-FromEntityHeader":"Hosted","X-MS-Exchange-CrossTenant-Id":"8ae927fe-1255-47a7-a2af-5f3a069daaa2","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"SN2PR15MB0975","X-OriginatorOrg":"fb.com","X-Proofpoint-Spam-Reason":"safe","X-FB-Internal":"Safe","X-Proofpoint-Virus-Version":"vendor=fsecure engine=2.50.10432:, ,\n\tdefinitions=2017-09-01_05:, , signatures=0","Sender":"netdev-owner@vger.kernel.org","Precedence":"bulk","List-ID":"","X-Mailing-List":"netdev@vger.kernel.org"}},{"id":1762073,"web_url":"http://patchwork.ozlabs.org/comment/1762073/","msgid":"<20170901.202951.1362873321102324036.davem@davemloft.net>","list_archive_url":null,"date":"2017-09-02T03:29:51","subject":"Re: [net-next PATCH] bpf: sockmap update/simplify memory\n\taccounting scheme","submitter":{"id":15,"url":"http://patchwork.ozlabs.org/api/people/15/","name":"David Miller","email":"davem@davemloft.net"},"content":"From: John Fastabend \nDate: Fri, 01 Sep 2017 11:29:26 -0700\n\n> Instead of tracking wmem_queued and sk_mem_charge by incrementing\n> in the verdict SK_REDIRECT paths and decrementing in the tx work\n> path use skb_set_owner_w and sock_writeable helpers. This solves\n> a few issues with the current code. First, in SK_REDIRECT inc on\n> sk_wmem_queued and sk_mem_charge were being done without the peers\n> sock lock being held. Under stress this can result in accounting\n> errors when tx work and/or multiple verdict decisions are working\n> on the peer psock.\n> \n> Additionally, this cleans up the code because we can rely on the\n> default destructor to decrement memory accounting on kfree_skb. Also\n> this will trigger sk_write_space when space becomes available on\n> kfree_skb() which wasn't happening before and prevent __sk_free\n> from being called until all in-flight packets are completed.\n> \n> Fixes: 174a79ff9515 (\"bpf: sockmap with sk redirect support\")\n> Signed-off-by: John Fastabend \n> Acked-by: Daniel Borkmann \n\nApplied.","headers":{"Return-Path":"","X-Original-To":"patchwork-incoming@ozlabs.org","Delivered-To":"patchwork-incoming@ozlabs.org","Authentication-Results":"ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; helo=vger.kernel.org;\n\tenvelope-from=netdev-owner@vger.kernel.org;\n\treceiver=)","Received":["from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xkhSP3yF2z9s7C\n\tfor ;\n\tSat, 2 Sep 2017 13:29:57 +1000 (AEST)","(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1752634AbdIBD3x (ORCPT );\n\tFri, 1 Sep 2017 23:29:53 -0400","from shards.monkeyblade.net ([184.105.139.130]:57926 \"EHLO\n\tshards.monkeyblade.net\" rhost-flags-OK-OK-OK-OK) by vger.kernel.org\n\twith ESMTP id S1751347AbdIBD3w (ORCPT\n\t); Fri, 1 Sep 2017 23:29:52 -0400","from localhost (74-93-104-98-Washington.hfc.comcastbusiness.net\n\t[74.93.104.98]) (using TLSv1 with cipher AES256-SHA (256/256 bits))\n\t(Client did not present a certificate)\n\t(Authenticated sender: davem-davemloft)\n\tby shards.monkeyblade.net (Postfix) with ESMTPSA id 4B08313534D8A;\n\tFri, 1 Sep 2017 20:29:52 -0700 (PDT)"],"Date":"Fri, 01 Sep 2017 20:29:51 -0700 (PDT)","Message-Id":"<20170901.202951.1362873321102324036.davem@davemloft.net>","To":"john.fastabend@gmail.com","Cc":"netdev@vger.kernel.org, daniel@iogearbox.net, ast@fb.com","Subject":"Re: [net-next PATCH] bpf: sockmap update/simplify memory\n\taccounting scheme","From":"David Miller ","In-Reply-To":"<20170901182926.8981.77450.stgit@john-Precision-Tower-5810>","References":"<20170901182926.8981.77450.stgit@john-Precision-Tower-5810>","X-Mailer":"Mew version 6.7 on Emacs 25.2 / Mule 6.0 (HANACHIRUSATO)","Mime-Version":"1.0","Content-Type":"Text/Plain; charset=us-ascii","Content-Transfer-Encoding":"7bit","X-Greylist":"Sender succeeded SMTP AUTH, not delayed by\n\tmilter-greylist-4.5.12 (shards.monkeyblade.net\n\t[149.20.54.216]); Fri, 01 Sep 2017 20:29:52 -0700 (PDT)","Sender":"netdev-owner@vger.kernel.org","Precedence":"bulk","List-ID":"","X-Mailing-List":"netdev@vger.kernel.org"}}]