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Fri, 16 Apr 2021 20:13:21 +0000 From: Dexuan Cui To: davem@davemloft.net, kuba@kernel.org, kys@microsoft.com, haiyangz@microsoft.com, stephen@networkplumber.org, sthemmin@microsoft.com, wei.liu@kernel.org, liuwe@microsoft.com, netdev@vger.kernel.org, leon@kernel.org, andrew@lunn.ch, bernd@petrovitsch.priv.at, rdunlap@infradead.org, shacharr@microsoft.com Cc: linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, Dexuan Cui Subject: [PATCH v8 net-next 1/2] hv_netvsc: Make netvsc/VF binding check both MAC and serial number Date: Fri, 16 Apr 2021 13:11:58 -0700 Message-Id: <20210416201159.25807-2-decui@microsoft.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210416201159.25807-1-decui@microsoft.com> References: <20210416201159.25807-1-decui@microsoft.com> Reply-To: decui@microsoft.com X-Originating-IP: [2001:4898:80e8:f:1c9c:ebc0:6a19:ff8e] X-ClientProxiedBy: MW4PR03CA0024.namprd03.prod.outlook.com (2603:10b6:303:8f::29) To BL0PR2101MB1092.namprd21.prod.outlook.com (2603:10b6:207:37::26) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from decui-u1804.corp.microsoft.com (2001:4898:80e8:f:1c9c:ebc0:6a19:ff8e) by MW4PR03CA0024.namprd03.prod.outlook.com (2603:10b6:303:8f::29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4042.16 via Frontend Transport; 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The upcoming Microsoft Azure Network Adapter (MANA) supports multiple net_device interfaces (each such interface is called a "vPort", and has its unique MAC address) which are backed by the same VF PCI device, so the binding logic should check both the MAC address and the PCI serial number. The change should not break any other existing VF drivers, because Hyper-V NIC SR-IOV implementation requires the netvsc network interface and the VF network interface have the same MAC address. Co-developed-by: Haiyang Zhang Signed-off-by: Haiyang Zhang Co-developed-by: Shachar Raindel Signed-off-by: Shachar Raindel Signed-off-by: Dexuan Cui Acked-by: Stephen Hemminger --- drivers/net/hyperv/netvsc_drv.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c index 7349a70af083..f682a5572d84 100644 --- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -2297,6 +2297,7 @@ static struct net_device *get_netvsc_byslot(const struct net_device *vf_netdev) { struct device *parent = vf_netdev->dev.parent; struct net_device_context *ndev_ctx; + struct net_device *ndev; struct pci_dev *pdev; u32 serial; @@ -2319,8 +2320,17 @@ static struct net_device *get_netvsc_byslot(const struct net_device *vf_netdev) if (!ndev_ctx->vf_alloc) continue; - if (ndev_ctx->vf_serial == serial) - return hv_get_drvdata(ndev_ctx->device_ctx); + if (ndev_ctx->vf_serial != serial) + continue; + + ndev = hv_get_drvdata(ndev_ctx->device_ctx); + if (ndev->addr_len != vf_netdev->addr_len || + memcmp(ndev->perm_addr, vf_netdev->perm_addr, + ndev->addr_len) != 0) + continue; + + return ndev; + } netdev_notice(vf_netdev,