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[209.132.180.67]) by mx.google.com with ESMTP id dv24si7730051ejb.60.2019.09.30.13.51.59; Mon, 30 Sep 2019 13:52:30 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-wireless-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-wireless-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-wireless-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=canonical.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731010AbfI3UtW convert rfc822-to-8bit (ORCPT + 99 others); Mon, 30 Sep 2019 16:49:22 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:38043 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726314AbfI3UtW (ORCPT ); Mon, 30 Sep 2019 16:49:22 -0400 Received: from c-67-160-6-8.hsd1.wa.comcast.net ([67.160.6.8] helo=famine.localdomain) by youngberry.canonical.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1iF2bI-0001tC-QZ; Mon, 30 Sep 2019 20:48:57 +0000 Received: by famine.localdomain (Postfix, from userid 1000) id 1390C5FF6C; Mon, 30 Sep 2019 13:48:55 -0700 (PDT) Received: from famine (localhost [127.0.0.1]) by famine.localdomain (Postfix) with ESMTP id 0BA3EA9BF8; Mon, 30 Sep 2019 13:48:55 -0700 (PDT) From: Jay Vosburgh To: Taehee Yoo cc: davem@davemloft.net, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, jakub.kicinski@netronome.com, johannes@sipsolutions.net, vfalico@gmail.com, andy@greyhouse.net, jiri@resnulli.us, sd@queasysnail.net, roopa@cumulusnetworks.com, saeedm@mellanox.com, manishc@marvell.com, rahulv@marvell.com, kys@microsoft.com, haiyangz@microsoft.com, stephen@networkplumber.org, sashal@kernel.org, hare@suse.de, varun@chelsio.com, ubraun@linux.ibm.com, kgraul@linux.ibm.com, schuffelen@google.com, bjorn@mork.no Subject: Re: [PATCH net v4 03/12] bonding: fix unexpected IFF_BONDING bit unset In-reply-to: <20190928164843.31800-4-ap420073@gmail.com> References: <20190928164843.31800-1-ap420073@gmail.com> <20190928164843.31800-4-ap420073@gmail.com> Comments: In-reply-to Taehee Yoo message dated "Sat, 28 Sep 2019 16:48:34 -0000." X-Mailer: MH-E 8.6+git; nmh 1.6; GNU Emacs 27.0.50 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <26314.1569876535.1@famine> Content-Transfer-Encoding: 8BIT Date: Mon, 30 Sep 2019 13:48:55 -0700 Message-ID: <26315.1569876535@famine> Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Taehee Yoo wrote: >The IFF_BONDING means bonding master or bonding slave device. >->ndo_add_slave() sets IFF_BONDING flag and ->ndo_del_slave() unsets >IFF_BONDING flag. > >bond0<--bond1 > >Both bond0 and bond1 are bonding device and these should keep having >IFF_BONDING flag until they are removed. >But bond1 would lose IFF_BONDING at ->ndo_del_slave() because that routine >do not check whether the slave device is the bonding type or not. >This patch adds the interface type check routine before removing >IFF_BONDING flag. > >Test commands: > ip link add bond0 type bond > ip link add bond1 type bond > ip link set bond1 master bond0 > ip link set bond1 nomaster > ip link del bond1 type bond > ip link add bond1 type bond > >Splat looks like: >[ 38.843933] proc_dir_entry 'bonding/bond1' already registered >[ 38.844741] WARNING: CPU: 1 PID: 631 at fs/proc/generic.c:361 proc_register+0x2a9/0x3e0 >[ 38.845741] Modules linked in: bonding ip_tables x_tables >[ 38.846432] CPU: 1 PID: 631 Comm: ip Not tainted 5.3.0+ #3 >[ 38.847234] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 >[ 38.848489] RIP: 0010:proc_register+0x2a9/0x3e0 >[ 38.849164] Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 39 01 00 00 48 8b 04 24 48 89 ea 48 c7 c7 e0 2b 34 b3 48 8b b0 e >0 00 00 00 e8 c7 b6 89 ff <0f> 0b 48 c7 c7 40 3d c5 b3 e8 99 7a 38 01 48 8b 4c 24 10 48 b8 00 >[ 38.851317] RSP: 0018:ffff888061527078 EFLAGS: 00010282 >[ 38.851902] RAX: dffffc0000000008 RBX: ffff888064dc8cb0 RCX: ffffffffb1d252a2 >[ 38.852684] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88806cbf6b8c >[ 38.853464] RBP: ffff888064dc8f33 R08: ffffed100d980019 R09: ffffed100d980019 >[ 38.854242] R10: 0000000000000001 R11: ffffed100d980018 R12: ffff888064dc8e48 >[ 38.855929] R13: ffff888064dc8f32 R14: dffffc0000000000 R15: ffffed100c9b91e6 >[ 38.856695] FS: 00007fc9fcc230c0(0000) GS:ffff88806ca00000(0000) knlGS:0000000000000000 >[ 38.857541] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >[ 38.858150] CR2: 000055948b91c118 CR3: 0000000057110006 CR4: 00000000000606e0 >[ 38.858957] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >[ 38.859785] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >[ 38.860700] Call Trace: >[ 38.861004] proc_create_seq_private+0xb3/0xf0 >[ 38.861460] bond_create_proc_entry+0x1b3/0x3f0 [bonding] >[ 38.862113] bond_netdev_event+0x433/0x970 [bonding] >[ 38.862762] ? __module_text_address+0x13/0x140 >[ 38.867678] notifier_call_chain+0x90/0x160 >[ 38.868257] register_netdevice+0x9b3/0xd80 >[ 38.868791] ? alloc_netdev_mqs+0x854/0xc10 >[ 38.869335] ? netdev_change_features+0xa0/0xa0 >[ 38.869852] ? rtnl_create_link+0x2ed/0xad0 >[ 38.870423] bond_newlink+0x2a/0x60 [bonding] >[ 38.870935] __rtnl_newlink+0xb9f/0x11b0 >[ ... ] >Fixes: 0b680e753724 ("[PATCH] bonding: Add priv_flag to avoid event mishandling") >Signed-off-by: Taehee Yoo Signed-off-by: Jay Vosburgh >--- > >v2 -> v4 : > - This patch is not changed >v1 -> v2 : > - Do not add a new priv_flag. > > drivers/net/bonding/bond_main.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > >diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c >index 931d9d935686..0db12fcfc953 100644 >--- a/drivers/net/bonding/bond_main.c >+++ b/drivers/net/bonding/bond_main.c >@@ -1816,7 +1816,8 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev, > slave_disable_netpoll(new_slave); > > err_close: >- slave_dev->priv_flags &= ~IFF_BONDING; >+ if (!netif_is_bond_master(slave_dev)) >+ slave_dev->priv_flags &= ~IFF_BONDING; > dev_close(slave_dev); > > err_restore_mac: >@@ -2017,7 +2018,8 @@ static int __bond_release_one(struct net_device *bond_dev, > else > dev_set_mtu(slave_dev, slave->original_mtu); > >- slave_dev->priv_flags &= ~IFF_BONDING; >+ if (!netif_is_bond_master(slave_dev)) >+ slave_dev->priv_flags &= ~IFF_BONDING; > > bond_free_slave(slave); > >-- >2.17.1 >