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GET /api/1.2/patches/831016/?format=api
{ "id": 831016, "url": "http://patchwork.ozlabs.org/api/1.2/patches/831016/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netdev/patch/20171027012443.3306-10-xiyou.wangcong@gmail.com/", "project": { "id": 7, "url": "http://patchwork.ozlabs.org/api/1.2/projects/7/?format=api", "name": "Linux network development", "link_name": "netdev", "list_id": "netdev.vger.kernel.org", "list_email": "netdev@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20171027012443.3306-10-xiyou.wangcong@gmail.com>", "list_archive_url": null, "date": "2017-10-27T01:24:36", "name": "[net,09/16] net_sched: use tcf_queue_work() in u32 filter", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": true, "hash": "74b125e250bf70e205db0b5712e2078710ba59cf", "submitter": { "id": 211, "url": "http://patchwork.ozlabs.org/api/1.2/people/211/?format=api", "name": "Cong Wang", "email": "xiyou.wangcong@gmail.com" }, "delegate": { "id": 34, "url": "http://patchwork.ozlabs.org/api/1.2/users/34/?format=api", "username": "davem", "first_name": "David", "last_name": "Miller", "email": "davem@davemloft.net" }, "mbox": "http://patchwork.ozlabs.org/project/netdev/patch/20171027012443.3306-10-xiyou.wangcong@gmail.com/mbox/", "series": [ { "id": 10472, "url": "http://patchwork.ozlabs.org/api/1.2/series/10472/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netdev/list/?series=10472", "date": "2017-10-27T01:24:27", "name": "net_sched: fix races with RCU callbacks", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/10472/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/831016/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/831016/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<netdev-owner@vger.kernel.org>", "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=<UNKNOWN>)", "ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"mPe/71tD\"; dkim-atps=neutral" ], "Received": [ "from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3yNR5L0Jm3z9t2h\n\tfor <patchwork-incoming@ozlabs.org>;\n\tFri, 27 Oct 2017 12:25:26 +1100 (AEDT)", "(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S932459AbdJ0BZX (ORCPT <rfc822;patchwork-incoming@ozlabs.org>);\n\tThu, 26 Oct 2017 21:25:23 -0400", "from mail-pg0-f66.google.com ([74.125.83.66]:50277 \"EHLO\n\tmail-pg0-f66.google.com\" rhost-flags-OK-OK-OK-OK) by vger.kernel.org\n\twith ESMTP id S932345AbdJ0BZJ (ORCPT\n\t<rfc822;netdev@vger.kernel.org>); Thu, 26 Oct 2017 21:25:09 -0400", "by mail-pg0-f66.google.com with SMTP id y5so4055300pgq.7\n\tfor <netdev@vger.kernel.org>; Thu, 26 Oct 2017 18:25:09 -0700 (PDT)", "from tw-172-25-30-113.office.twttr.net ([8.25.197.25])\n\tby smtp.gmail.com with ESMTPSA id\n\tb16sm13211973pfe.58.2017.10.26.18.25.07\n\t(version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256);\n\tThu, 26 Oct 2017 18:25:07 -0700 (PDT)" ], "DKIM-Signature": "v=1; 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\n\tThu, 26 Oct 2017 18:25:08 -0700 (PDT)", "From": "Cong Wang <xiyou.wangcong@gmail.com>", "To": "netdev@vger.kernel.org", "Cc": "Chris Mi <chrism@mellanox.com>, Cong Wang <xiyou.wangcong@gmail.com>,\n\tDaniel Borkmann <daniel@iogearbox.net>, Jiri Pirko <jiri@resnulli.us>,\n\tJohn Fastabend <john.fastabend@gmail.com>,\n\tJamal Hadi Salim <jhs@mojatatu.com>,\n\t\"Paul E. McKenney\" <paulmck@linux.vnet.ibm.com>", "Subject": "[Patch net 09/16] net_sched: use tcf_queue_work() in u32 filter", "Date": "Thu, 26 Oct 2017 18:24:36 -0700", "Message-Id": "<20171027012443.3306-10-xiyou.wangcong@gmail.com>", "X-Mailer": "git-send-email 2.9.4", "In-Reply-To": "<20171027012443.3306-1-xiyou.wangcong@gmail.com>", "References": "<20171027012443.3306-1-xiyou.wangcong@gmail.com>", "Sender": "netdev-owner@vger.kernel.org", "Precedence": "bulk", "List-ID": "<netdev.vger.kernel.org>", "X-Mailing-List": "netdev@vger.kernel.org" }, "content": "Defer the tcf_exts_destroy() in RCU callback to\ntc filter workqueue and get RTNL lock.\n\nReported-by: Chris Mi <chrism@mellanox.com>\nCc: Daniel Borkmann <daniel@iogearbox.net>\nCc: Jiri Pirko <jiri@resnulli.us>\nCc: John Fastabend <john.fastabend@gmail.com>\nCc: Jamal Hadi Salim <jhs@mojatatu.com>\nCc: \"Paul E. McKenney\" <paulmck@linux.vnet.ibm.com>\nSigned-off-by: Cong Wang <xiyou.wangcong@gmail.com>\n---\n net/sched/cls_u32.c | 29 ++++++++++++++++++++++++++---\n 1 file changed, 26 insertions(+), 3 deletions(-)", "diff": "diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c\nindex 10b8d851fc6b..dadd1b344497 100644\n--- a/net/sched/cls_u32.c\n+++ b/net/sched/cls_u32.c\n@@ -68,7 +68,10 @@ struct tc_u_knode {\n \tu32 __percpu\t\t*pcpu_success;\n #endif\n \tstruct tcf_proto\t*tp;\n-\tstruct rcu_head\t\trcu;\n+\tunion {\n+\t\tstruct work_struct\twork;\n+\t\tstruct rcu_head\t\trcu;\n+\t};\n \t/* The 'sel' field MUST be the last field in structure to allow for\n \t * tc_u32_keys allocated at end of structure.\n \t */\n@@ -418,11 +421,21 @@ static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n,\n * this the u32_delete_key_rcu variant does not free the percpu\n * statistics.\n */\n+static void u32_delete_key_work(struct work_struct *work)\n+{\n+\tstruct tc_u_knode *key = container_of(work, struct tc_u_knode, work);\n+\n+\trtnl_lock();\n+\tu32_destroy_key(key->tp, key, false);\n+\trtnl_unlock();\n+}\n+\n static void u32_delete_key_rcu(struct rcu_head *rcu)\n {\n \tstruct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);\n \n-\tu32_destroy_key(key->tp, key, false);\n+\tINIT_WORK(&key->work, u32_delete_key_work);\n+\ttcf_queue_work(&key->work);\n }\n \n /* u32_delete_key_freepf_rcu is the rcu callback variant\n@@ -432,11 +445,21 @@ static void u32_delete_key_rcu(struct rcu_head *rcu)\n * for the variant that should be used with keys return from\n * u32_init_knode()\n */\n+static void u32_delete_key_freepf_work(struct work_struct *work)\n+{\n+\tstruct tc_u_knode *key = container_of(work, struct tc_u_knode, work);\n+\n+\trtnl_lock();\n+\tu32_destroy_key(key->tp, key, true);\n+\trtnl_unlock();\n+}\n+\n static void u32_delete_key_freepf_rcu(struct rcu_head *rcu)\n {\n \tstruct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);\n \n-\tu32_destroy_key(key->tp, key, true);\n+\tINIT_WORK(&key->work, u32_delete_key_freepf_work);\n+\ttcf_queue_work(&key->work);\n }\n \n static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)\n", "prefixes": [ "net", "09/16" ] }