From patchwork Mon Dec 14 21:19:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lijun Pan X-Patchwork-Id: 11973125 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A5327C4361B for ; Mon, 14 Dec 2020 21:20:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6AF4D224B0 for ; Mon, 14 Dec 2020 21:20:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388036AbgLNVUZ (ORCPT ); Mon, 14 Dec 2020 16:20:25 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:3058 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2503456AbgLNVUO (ORCPT ); Mon, 14 Dec 2020 16:20:14 -0500 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 0BEL3SeE022532 for ; Mon, 14 Dec 2020 16:19:33 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=g/UGOVxkTb7+BI1rK7MXmu9Hy/Oazee+sp1yohbwXRs=; b=TkND/T+NuTE3g+W6MtIuxHiz/BUDDzSnhB/lSB5VRXZKfTmrlAt9e3VheamxTL/zlOH/ nfqv6pmE1GukATyxMgP8wuyIFZO7RPEromhz7iTSOxmKS+wPf8dKYD8NN/mVlcQMmLwP ZeRqkG7d1e1BRDRKMwcQqHa4MehRRB8mZLhNRXzLm/e2d4zwqHrxRP2WiBIPKoT20ijI 4A1eqUXIHdq+ZzPGAsGf85YYjqD8vIbaui5bToULjj/Jjxe8i4Qx0M/e5HyaNx4DG6ix nVACnAX1BZ/LbzZXg+oUfGG9zo5BnKjfDGAgThg5JnV0KlhoCRbZ/22yHKi8Ep/rZgF+ eA== Received: from ppma02dal.us.ibm.com (a.bd.3ea9.ip4.static.sl-reverse.com [169.62.189.10]) by mx0b-001b2d01.pphosted.com with ESMTP id 35ebf6fvck-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 14 Dec 2020 16:19:33 -0500 Received: from pps.filterd (ppma02dal.us.ibm.com [127.0.0.1]) by ppma02dal.us.ibm.com (8.16.0.42/8.16.0.42) with SMTP id 0BELGpw7019562 for ; Mon, 14 Dec 2020 21:19:32 GMT Received: from b01cxnp22034.gho.pok.ibm.com (b01cxnp22034.gho.pok.ibm.com [9.57.198.24]) by ppma02dal.us.ibm.com with ESMTP id 35d525hqy1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 14 Dec 2020 21:19:32 +0000 Received: from b01ledav001.gho.pok.ibm.com (b01ledav001.gho.pok.ibm.com [9.57.199.106]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 0BELJVRa30081324 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 14 Dec 2020 21:19:31 GMT Received: from b01ledav001.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 92CE52805A; Mon, 14 Dec 2020 21:19:31 +0000 (GMT) Received: from b01ledav001.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4BE6628059; Mon, 14 Dec 2020 21:19:31 +0000 (GMT) Received: from pompom.ibm.com (unknown [9.80.237.30]) by b01ledav001.gho.pok.ibm.com (Postfix) with ESMTP; Mon, 14 Dec 2020 21:19:31 +0000 (GMT) From: Lijun Pan To: netdev@vger.kernel.org Cc: Lijun Pan , Nathan Lynch Subject: [PATCH net-next v2 1/3] net: core: introduce __netdev_notify_peers Date: Mon, 14 Dec 2020 15:19:28 -0600 Message-Id: <20201214211930.80778-2-ljp@linux.ibm.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20201214211930.80778-1-ljp@linux.ibm.com> References: <20201214211930.80778-1-ljp@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.343,18.0.737 definitions=2020-12-14_11:2020-12-11,2020-12-14 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 phishscore=0 adultscore=0 clxscore=1015 lowpriorityscore=0 spamscore=0 impostorscore=0 bulkscore=0 suspectscore=0 priorityscore=1501 mlxlogscore=999 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012140137 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org There are some use cases for netdev_notify_peers in the context when rtnl lock is already held. Introduce lockless version of netdev_notify_peers call to save the extra code to call call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev); call_netdevice_notifiers(NETDEV_RESEND_IGMP, dev); After that, convert netdev_notify_peers to call the new helper. Suggested-by: Nathan Lynch Signed-off-by: Lijun Pan --- include/linux/netdevice.h | 1 + net/core/dev.c | 22 ++++++++++++++++++++-- 2 files changed, 21 insertions(+), 2 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 7bf167993c05..259be67644e3 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -4547,6 +4547,7 @@ void __dev_set_rx_mode(struct net_device *dev); int dev_set_promiscuity(struct net_device *dev, int inc); int dev_set_allmulti(struct net_device *dev, int inc); void netdev_state_change(struct net_device *dev); +void __netdev_notify_peers(struct net_device *dev); void netdev_notify_peers(struct net_device *dev); void netdev_features_change(struct net_device *dev); /* Load a device via the kmod */ diff --git a/net/core/dev.c b/net/core/dev.c index bde98cfd166f..43e3b176a30a 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1456,6 +1456,25 @@ void netdev_state_change(struct net_device *dev) } EXPORT_SYMBOL(netdev_state_change); +/** + * __netdev_notify_peers - notify network peers about existence of @dev, + * to be called when rtnl lock is already held. + * @dev: network device + * + * Generate traffic such that interested network peers are aware of + * @dev, such as by generating a gratuitous ARP. This may be used when + * a device wants to inform the rest of the network about some sort of + * reconfiguration such as a failover event or virtual machine + * migration. + */ +void __netdev_notify_peers(struct net_device *dev) +{ + ASSERT_RTNL(); + call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev); + call_netdevice_notifiers(NETDEV_RESEND_IGMP, dev); +} +EXPORT_SYMBOL(__netdev_notify_peers); + /** * netdev_notify_peers - notify network peers about existence of @dev * @dev: network device @@ -1469,8 +1488,7 @@ EXPORT_SYMBOL(netdev_state_change); void netdev_notify_peers(struct net_device *dev) { rtnl_lock(); - call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev); - call_netdevice_notifiers(NETDEV_RESEND_IGMP, dev); + __netdev_notify_peers(dev); rtnl_unlock(); } EXPORT_SYMBOL(netdev_notify_peers);