From patchwork Fri Jan 27 20:45:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Vivier X-Patchwork-Id: 49688 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:adf:eb09:0:0:0:0:0 with SMTP id s9csp1047520wrn; Fri, 27 Jan 2023 13:15:46 -0800 (PST) X-Google-Smtp-Source: AMrXdXt3THm/k9LpU0HtOxV5NWGjxf64g2+DMQkMVO4fh+CWcP1SVOrHShRaAm0JzL2xsyqXqcvl X-Received: by 2002:a05:6a21:1643:b0:a3:8eb5:6869 with SMTP id no3-20020a056a21164300b000a38eb56869mr35783258pzb.14.1674854146524; Fri, 27 Jan 2023 13:15:46 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1674854146; cv=none; d=google.com; s=arc-20160816; b=PM+rGU0kjrneiCfHKUMPkTGz3uVneOQiOpu1elzU0FbRwczsu2riS2SaMFR7Ykhcj0 7BYu2TdCUnhHBlEvpJD7+VqzYb/Kg+uafow9E1VphbCMYWHohImonlnrtmBf9Z6kck4l rpcay7+2gS69rQqpYCVbdzLqTlWHYOpZWqr/ZyWcCf743VRBVyPqOnr3renbbxuuLyBm 7u+s1RYSd50yrXUA1zMpnVNJ7SdRw/zFs+yggrGn99gmjlxQlKjd5FxdOQm9bGLS2DAQ 79YvMyETLTtWFTUCoDunzN/jqcx+ZRNuDNiJMhZrlWpUwMTX/eP3iIbIVp31sxAC+xVP U+ew== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:ui-outboundreport:content-transfer-encoding :mime-version:references:in-reply-to:message-id:date:subject:cc:to :from; bh=UJtJ7mANpMdkdiwP4kjrNCqJhAVGgCLJbR8IGAbKQpM=; b=Q7cjGgco92t60H6hijxPwcDk2GMU/Fpxv8KvK/TQFM9DKjAaNpBPt02qgWX4rxEMts C67Y+RED9OsXaAiGo1JECsFmk9Pnzt5OmDKivWpuwYRUDNA+D9Guw5n0TlZM8G3R9Esk sNDjChScfZ2SA7jQ3JV2ckhp4R7Q9sImffWpUnOQI/F+RbNA9UrqNvg/SaZCi+w4UNqZ qlIHBOC4zG2He/WDKKga2EdLrgGqvAHwnjUdFUHjt+lD+MF9hvFs+onjKJ+SKyO0nX7Z zy+A9K/PfVLaTwWuUsrUzjb00BekqVmnCtU4EGn3Bi3XA8lGJcudyyuddWmIkF0QJ8hs GQDA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id e3-20020a633703000000b004cf7904ba60si5205134pga.25.2023.01.27.13.15.34; Fri, 27 Jan 2023 13:15:46 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230352AbjA0UqY (ORCPT + 99 others); Fri, 27 Jan 2023 15:46:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51366 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229725AbjA0UqS (ORCPT ); Fri, 27 Jan 2023 15:46:18 -0500 Received: from mout.kundenserver.de (mout.kundenserver.de [217.72.192.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6D7A37E6EF; Fri, 27 Jan 2023 12:45:18 -0800 (PST) Received: from lenovo-t14s.redhat.com ([82.142.8.70]) by mrelayeu.kundenserver.de (mreue106 [212.227.15.183]) with ESMTPSA (Nemesis) id 1MWSJJ-1pBMAk2xND-00XusM; Fri, 27 Jan 2023 21:45:05 +0100 From: Laurent Vivier To: linux-kernel@vger.kernel.org Cc: "David S. Miller" , virtualization@lists.linux-foundation.org, Cindy Lu , "Michael S. Tsirkin" , Eli Cohen , Gautam Dawar , =?utf-8?q?Eugenio_P=C3=A9rez?= , Jason Wang , netdev@vger.kernel.org, Parav Pandit Subject: [PATCH v3 2/2] virtio_net: notify MAC address change on device initialization Date: Fri, 27 Jan 2023 21:45:00 +0100 Message-Id: <20230127204500.51930-3-lvivier@redhat.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230127204500.51930-1-lvivier@redhat.com> References: <20230127204500.51930-1-lvivier@redhat.com> MIME-Version: 1.0 X-Provags-ID: V03:K1:vDP/sU3WbWB3aipv6spulG2sZ/1/Qx0NRvtEbQ/95jvDYBrgqmv ZN3NrtTNEg7/lbeTe7M8RMTYDDBTb50tIFBE5sKC1+dGcykmefRnplHi5Jj2SuoDef9L+k8 JsT+qgN5H7TdT7yYUGdVrw20FOcRMzLIMrLttqxHXylaSE9B0r6WpmSiZaB3QykOyrbZxc9 8csVaeU/XH5gJCpVVFPig== UI-OutboundReport: notjunk:1;M01:P0:YlxfpHwCfKI=;F2Z0qtzUOVtZt2dyT7TyrApqXPl /OeE0Hrod1cbH/ILzhse+N7lHTWXmIgWXuf+n0WQUqw1sXa9Jz6i2+MFzbTmxKYl1S2i003tC YGBElKmIKyDskmmbVIS60/ls4uaMq2tvd/qDkPPlxj2SpTgEuz1WnUDbjXnuIXMVy71DBuPCW 5b3zZxB8QgRHmcpbaxiHw3mtN1IYyQP8iiOiS7yM5oMu1hcQomQCjaGVYEst8rTpTRNPDCAOr uA+bYmu8jX0fWae/F9nClQ/NuCO/ssabz0eH17fhN1/3ldHjX8rFB0saoDU38165VHKapeV56 DJ7xFCGdbiMP0JdJLZVQiOQ1/agp6bjCkJg7Gwf2A+NJifDJKbeICCpFU127adGM6ryff4aHU W8r8NvqB+LwFaLKu61vl8Ou2sjxsIk2IM8b1FnJoVJDHioGCuEf3A3X9ld3FTHw6p0ZV2dv1e CnO7jf0pMeuAuje7hEFFT9cfnlDwiob8JwRvgCRDQhHp4f7vz7lkNS+l2UEOXf9FVVWFIQjXl c+lhxAi4lc+CGVdL09P+VjeMFpLzfbZFSoh1cnggzCybxcJVKZ6OMaMp0iaqkFy1hcL7qX0jS t+hBDNoqIHPyBatsD/L2fpOgGL0pNwqy4jzmSTK+3B8bMydMflilJl/5FVKKCYB6r0Q2ZwkoN gW8zeTeUzg/PVIi1dnTOD94brO2eEEoPwf4dvNZtXw== X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1756211861262309251?= X-GMAIL-MSGID: =?utf-8?q?1756211861262309251?= In virtnet_probe(), if the device doesn't provide a MAC address the driver assigns a random one. As we modify the MAC address we need to notify the device to allow it to update all the related information. The problem can be seen with vDPA and mlx5_vdpa driver as it doesn't assign a MAC address by default. The virtio_net device uses a random MAC address (we can see it with "ip link"), but we can't ping a net namespace from another one using the virtio-vdpa device because the new MAC address has not been provided to the hardware: RX packets are dropped since they don't go through the receive filters, TX packets go through unaffected. Signed-off-by: Laurent Vivier Acked-by: Michael S. Tsirkin --- drivers/net/virtio_net.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 7d700f8e545a..704a05f1c279 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -3806,6 +3806,8 @@ static int virtnet_probe(struct virtio_device *vdev) eth_hw_addr_set(dev, addr); } else { eth_hw_addr_random(dev); + dev_info(&vdev->dev, "Assigned random MAC address %pM\n", + dev->dev_addr); } /* Set up our device-specific information */ @@ -3933,6 +3935,24 @@ static int virtnet_probe(struct virtio_device *vdev) virtio_device_ready(vdev); + /* a random MAC address has been assigned, notify the device. + * We don't fail probe if VIRTIO_NET_F_CTRL_MAC_ADDR is not there + * because many devices work fine without getting MAC explicitly + */ + if (!virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && + virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { + struct scatterlist sg; + + sg_init_one(&sg, dev->dev_addr, dev->addr_len); + if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, + VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { + pr_debug("virtio_net: setting MAC address failed\n"); + rtnl_unlock(); + err = -EINVAL; + goto free_unregister_netdev; + } + } + rtnl_unlock(); err = virtnet_cpu_notif_add(vi);