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Tsirkin" To: Jakub Kicinski Subject: Re: [PATCH net-next v2] net: virtio: use eth_hw_addr_set() Message-ID: <20211027113033-mutt-send-email-mst@kernel.org> References: <20211027152012.3393077-1-kuba@kernel.org> MIME-Version: 1.0 In-Reply-To: <20211027152012.3393077-1-kuba@kernel.org> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mst@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Cc: netdev@vger.kernel.org, davem@davemloft.net, virtualization@lists.linux-foundation.org X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" On Wed, Oct 27, 2021 at 08:20:12AM -0700, Jakub Kicinski wrote: > Commit 406f42fa0d3c ("net-next: When a bond have a massive amount > of VLANs...") introduced a rbtree for faster Ethernet address look > up. To maintain netdev->dev_addr in this tree we need to make all > the writes to it go through appropriate helpers. > > Even though the current code uses dev->addr_len the we can switch > to eth_hw_addr_set() instead of dev_addr_set(). The netdev is > always allocated by alloc_etherdev_mq() and there are at least two > places which assume Ethernet address: > - the line below calling eth_hw_addr_random() > - virtnet_set_mac_address() -> eth_commit_mac_addr_change() > > Signed-off-by: Jakub Kicinski Acked-by: Michael S. Tsirkin > --- > v2: - actually switch to eth_hw_addr_set() not dev_addr_set() > - resize the buffer to ETH_ALEN > - pass ETH_ALEN instead of dev->dev_addr to virtio_cread_bytes() > > CC: mst@redhat.com > CC: jasowang@redhat.com > CC: virtualization@lists.linux-foundation.org > --- > drivers/net/virtio_net.c | 10 +++++++--- > 1 file changed, 7 insertions(+), 3 deletions(-) > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > index c501b5974aee..cc79343cd220 100644 > --- a/drivers/net/virtio_net.c > +++ b/drivers/net/virtio_net.c > @@ -3177,12 +3177,16 @@ static int virtnet_probe(struct virtio_device *vdev) > dev->max_mtu = MAX_MTU; > > /* Configuration may specify what MAC to use. Otherwise random. */ > - if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) > + if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { > + u8 addr[ETH_ALEN]; > + > virtio_cread_bytes(vdev, > offsetof(struct virtio_net_config, mac), > - dev->dev_addr, dev->addr_len); > - else > + addr, ETH_ALEN); > + eth_hw_addr_set(dev, addr); > + } else { > eth_hw_addr_random(dev); > + } > > /* Set up our device-specific information */ > vi = netdev_priv(dev); > -- > 2.31.1 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization