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GET /api/patches/817703/?format=api
{ "id": 817703, "url": "http://patchwork.ozlabs.org/api/patches/817703/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netdev/patch/280e7c35539483d58163adab20d19a954e1b08cb.1506114055.git.pabeni@redhat.com/", "project": { "id": 7, "url": "http://patchwork.ozlabs.org/api/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": "<280e7c35539483d58163adab20d19a954e1b08cb.1506114055.git.pabeni@redhat.com>", "list_archive_url": null, "date": "2017-09-22T21:06:28", "name": "[RFC,04/11] net: add simple socket-like dst cache helpers", "commit_ref": null, "pull_url": null, "state": "rfc", "archived": true, "hash": "901dee97ff090f866548ef07ce64dcd480f78391", "submitter": { "id": 67312, "url": "http://patchwork.ozlabs.org/api/people/67312/?format=api", "name": "Paolo Abeni", "email": "pabeni@redhat.com" }, "delegate": { "id": 34, "url": "http://patchwork.ozlabs.org/api/users/34/?format=api", "username": "davem", "first_name": "David", "last_name": "Miller", "email": "davem@davemloft.net" }, "mbox": "http://patchwork.ozlabs.org/project/netdev/patch/280e7c35539483d58163adab20d19a954e1b08cb.1506114055.git.pabeni@redhat.com/mbox/", "series": [ { "id": 4709, "url": "http://patchwork.ozlabs.org/api/series/4709/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netdev/list/?series=4709", "date": "2017-09-22T21:06:24", "name": "udp: full early demux for unconnected sockets", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/4709/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/817703/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/817703/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>)", "ext-mx05.extmail.prod.ext.phx2.redhat.com;\n\tdmarc=none (p=none dis=none) header.from=redhat.com", "ext-mx05.extmail.prod.ext.phx2.redhat.com;\n\tspf=fail smtp.mailfrom=pabeni@redhat.com" ], "Received": [ "from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xzQz23fFBz9sP1\n\tfor <patchwork-incoming@ozlabs.org>;\n\tSat, 23 Sep 2017 07:07:10 +1000 (AEST)", "(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1752728AbdIVVHJ (ORCPT <rfc822;patchwork-incoming@ozlabs.org>);\n\tFri, 22 Sep 2017 17:07:09 -0400", "from mx1.redhat.com ([209.132.183.28]:48756 \"EHLO mx1.redhat.com\"\n\trhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP\n\tid S1752694AbdIVVHE (ORCPT <rfc822;netdev@vger.kernel.org>);\n\tFri, 22 Sep 2017 17:07:04 -0400", "from smtp.corp.redhat.com\n\t(int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15])\n\t(using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))\n\t(No client certificate requested)\n\tby mx1.redhat.com (Postfix) with ESMTPS id 49E7FC9D34;\n\tFri, 22 Sep 2017 21:07:04 +0000 (UTC)", "from dhcppc0.redhat.com (ovpn-116-39.ams2.redhat.com\n\t[10.36.116.39])\n\tby smtp.corp.redhat.com (Postfix) with ESMTP id 93D705D6A2;\n\tFri, 22 Sep 2017 21:07:02 +0000 (UTC)" ], "DMARC-Filter": "OpenDMARC Filter v1.3.2 mx1.redhat.com 49E7FC9D34", "From": "Paolo Abeni <pabeni@redhat.com>", "To": "netdev@vger.kernel.org", "Cc": "\"David S. Miller\" <davem@davemloft.net>,\n\tPablo Neira Ayuso <pablo@netfilter.org>, Florian Westphal <fw@strlen.de>,\n\tEric Dumazet <edumazet@google.com>,\n\tHannes Frederic Sowa <hannes@stressinduktion.org>", "Subject": "[RFC PATCH 04/11] net: add simple socket-like dst cache helpers", "Date": "Fri, 22 Sep 2017 23:06:28 +0200", "Message-Id": "<280e7c35539483d58163adab20d19a954e1b08cb.1506114055.git.pabeni@redhat.com>", "In-Reply-To": "<cover.1506114055.git.pabeni@redhat.com>", "References": "<cover.1506114055.git.pabeni@redhat.com>", "X-Scanned-By": "MIMEDefang 2.79 on 10.5.11.15", "X-Greylist": "Sender IP whitelisted, not delayed by milter-greylist-4.5.16\n\t(mx1.redhat.com [10.5.110.29]);\n\tFri, 22 Sep 2017 21:07:04 +0000 (UTC)", "Sender": "netdev-owner@vger.kernel.org", "Precedence": "bulk", "List-ID": "<netdev.vger.kernel.org>", "X-Mailing-List": "netdev@vger.kernel.org" }, "content": "It will be used by later patches to reduce code duplication.\n\nSigned-off-by: Paolo Abeni <pabeni@redhat.com>\n---\n include/net/dst.h | 20 ++++++++++++++++++++\n net/core/dst.c | 12 ++++++++++++\n 2 files changed, 32 insertions(+)", "diff": "diff --git a/include/net/dst.h b/include/net/dst.h\nindex 93568bd0a352..4fcca0e368c6 100644\n--- a/include/net/dst.h\n+++ b/include/net/dst.h\n@@ -485,6 +485,26 @@ static inline struct dst_entry *dst_check(struct dst_entry *dst, u32 cookie)\n \treturn dst;\n }\n \n+/* update the cache with dst, assuming the latter already carries a refcount */\n+static inline bool __dst_update(struct dst_entry **cache, struct dst_entry *dst)\n+{\n+\tstruct dst_entry *old = xchg(cache, dst);\n+\n+\tdst_release(old);\n+\treturn old != dst;\n+}\n+bool dst_update(struct dst_entry **cache, struct dst_entry *dst);\n+static inline struct dst_entry *dst_access(struct dst_entry **cache,\n+\t\t\t\t\t u32 cookie)\n+{\n+\tstruct dst_entry *dst = READ_ONCE(*cache);\n+\n+\tif (!dst)\n+\t\treturn NULL;\n+\n+\treturn dst_check(dst, cookie);\n+}\n+\n /* Flags for xfrm_lookup flags argument. */\n enum {\n \tXFRM_LOOKUP_ICMP = 1 << 0,\ndiff --git a/net/core/dst.c b/net/core/dst.c\nindex a6c47da7d0f8..4076f9af45d7 100644\n--- a/net/core/dst.c\n+++ b/net/core/dst.c\n@@ -205,6 +205,18 @@ void dst_release_immediate(struct dst_entry *dst)\n }\n EXPORT_SYMBOL(dst_release_immediate);\n \n+/* update the cache with dst, assuming the latter does not carry a refcount */\n+bool dst_update(struct dst_entry **cache, struct dst_entry *dst)\n+{\n+\tif (likely(*cache == dst))\n+\t\treturn false;\n+\n+\tif (dst_hold_safe(dst))\n+\t\treturn __dst_update(cache, dst);\n+\treturn false;\n+}\n+EXPORT_SYMBOL_GPL(dst_update);\n+\n u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old)\n {\n \tstruct dst_metrics *p = kmalloc(sizeof(*p), GFP_ATOMIC);\n", "prefixes": [ "RFC", "04/11" ] }