From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 16902A00BE; Mon, 25 Apr 2022 05:59:02 +0200 (CEST) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id B107841132; Mon, 25 Apr 2022 05:59:01 +0200 (CEST) Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by mails.dpdk.org (Postfix) with ESMTP id D6603410E6 for ; Mon, 25 Apr 2022 05:58:59 +0200 (CEST) Received: from kwepemi500012.china.huawei.com (unknown [172.30.72.55]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4Kmrp32dRTzfZjm; Mon, 25 Apr 2022 11:58:03 +0800 (CST) Received: from [10.67.103.128] (10.67.103.128) by kwepemi500012.china.huawei.com (7.221.188.12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 25 Apr 2022 11:58:54 +0800 Subject: Re: [PATCH v2] kni: fix device address set To: CC: Neil Horman , Thomas Monjalon , , Stephen Hemminger References: <20220406082213.45750-1-humin29@huawei.com> <20220407082544.21282-1-humin29@huawei.com> From: "Min Hu (Connor)" Message-ID: <055d7f5e-1625-5166-8f1e-5892d6bf98b0@huawei.com> Date: Mon, 25 Apr 2022 11:58:53 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.3.1 MIME-Version: 1.0 In-Reply-To: <20220407082544.21282-1-humin29@huawei.com> Content-Type: text/plain; charset="gbk"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.67.103.128] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To kwepemi500012.china.huawei.com (7.221.188.12) X-CFilter-Loop: Reflected X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Hi, all, any one has any comments for this patch? ÔÚ 2022/4/7 16:25, Min Hu (Connor) дµÀ: > Currently, run KNI APP When Kernel version is 5.17. When quit the APP, > dmesg buffer get calltrace, info like: > [ 5965.847401] rte_kni: Creating kni... > [ 6225.627205] vEth0 (unregistered): Current addr: 70 fd 45 d0 72 a7 00.. > [ 6225.640113] vEth0 (unregistered): Expected addr: 00 00 00 00 00 00 00.. > [ 6225.653010] ------------[ cut here ]------------ > [ 6225.657609] netdevice: vEth0 (unregistered): Incorrect netdev->dev_addr > [ 6225.832647] Call trace: > [ 6225.835083] dev_addr_check+0xa0/0x144 > [ 6225.838816] dev_addr_flush+0x30/0x9c > [ 6225.842462] free_netdev+0x8c/0x1e0 > [ 6225.845939] kni_release+0xc0/0x1d0 [rte_kni] > [ 6225.850281] __fput+0x78/0x220 > [ 6225.853327] ____fput+0x1c/0x30 > [ 6225.856455] task_work_run+0x88/0xc0 > [ 6225.860017] do_exit+0x2fc/0x940 > [ 6225.863232] do_group_exit+0x40/0xac > [ 6225.866791] get_signal+0x190/0x960 > [ 6225.870265] do_notify_resume+0x26c/0x1360 > [ 6225.874346] el0_interrupt+0x60/0xe0 > [ 6225.877910] __el0_irq_handler_common+0x18/0x24 > [ 6225.882420] el0t_64_irq_handler+0x14/0x20 > [ 6225.886499] el0t_64_irq+0x1a0/0x1a4 > [ 6225.890059] ---[ end trace 0000000000000000 ]--- > [ 6245.598157] rte_kni: Creating kni... > > The reason is that 5.17 kernel introduce 'dev_addr_shadow' in function > 'dev_addr_set' to ensure that netdev->dev_addr should only be modified > via helpers('dev_addr_set'). 'dev_addr_check' will check if > netdev->dev_addr is modified by other ways, like 'memcpy'. > > More info could get by referring to kernel patch: > https://patchwork.kernel.org/project/netdevbpf/patch/ > 20211118041501.3102861-8-kuba@kernel.org/ > https://www.spinics.net/lists/netdev/msg764992.html > > Fixes: ea6b39b5b847 ("kni: remove ethtool support") > > Signed-off-by: Min Hu (Connor) > --- > v2: > * change 'memcpy' to 'ether_addr_copy' to copy device addr. > --- > kernel/linux/kni/kni_misc.c | 10 ++++++++-- > 1 file changed, 8 insertions(+), 2 deletions(-) > > diff --git a/kernel/linux/kni/kni_misc.c b/kernel/linux/kni/kni_misc.c > index 780187d8bf..17b6c21a36 100644 > --- a/kernel/linux/kni/kni_misc.c > +++ b/kernel/linux/kni/kni_misc.c > @@ -299,6 +299,7 @@ kni_ioctl_create(struct net *net, uint32_t ioctl_num, > struct kni_net *knet = net_generic(net, kni_net_id); > int ret; > struct rte_kni_device_info dev_info; > + unsigned char mac_addr[ETH_ALEN]; > struct net_device *net_dev = NULL; > struct kni_dev *kni, *dev, *n; > > @@ -403,10 +404,15 @@ kni_ioctl_create(struct net *net, uint32_t ioctl_num, > > /* if user has provided a valid mac address */ > if (is_valid_ether_addr(dev_info.mac_addr)) > - memcpy(net_dev->dev_addr, dev_info.mac_addr, ETH_ALEN); > + ether_addr_copy(mac_addr, dev_info.mac_addr) > else > /* Generate random MAC address. */ > - eth_random_addr(net_dev->dev_addr); > + eth_random_addr(mac_addr); > +#if KERNEL_VERSION(5, 17, 0) > LINUX_VERSION_CODE > + ether_addr_copy(net_dev->dev_addr, mac_addr) > +#else > + dev_addr_set(net_dev, mac_addr); > +#endif > > if (dev_info.mtu) > net_dev->mtu = dev_info.mtu; >