From 1ce09e899d2864b4c8ed8f777c396bcb953aa3c9 Mon Sep 17 00:00:00 2001 From: Haiyang Zhang Date: Tue, 10 Jul 2012 07:19:22 +0000 Subject: hyperv: Add support for setting MAC from within guests This adds support for setting synthetic NIC MAC address from within Linux guests. Before using this feature, the option "spoofing of MAC address" should be enabled at the Hyper-V manager / Settings of the synthetic NIC. Thanks to Kin Cho for the initial implementation and tests. And, thanks to Long Li for the debugging works. Reported-and-tested-by: Kin Cho Reported-by: Long Li Signed-off-by: Haiyang Zhang Reviewed-by: K. Y. Srinivasan Signed-off-by: David S. Miller --- drivers/net/hyperv/netvsc_drv.c | 30 +++++++++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) (limited to 'drivers/net/hyperv/netvsc_drv.c') diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c index 8f8ed332042..8e23c084c4a 100644 --- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -341,6 +341,34 @@ static int netvsc_change_mtu(struct net_device *ndev, int mtu) return 0; } + +static int netvsc_set_mac_addr(struct net_device *ndev, void *p) +{ + struct net_device_context *ndevctx = netdev_priv(ndev); + struct hv_device *hdev = ndevctx->device_ctx; + struct sockaddr *addr = p; + char save_adr[14]; + unsigned char save_aatype; + int err; + + memcpy(save_adr, ndev->dev_addr, ETH_ALEN); + save_aatype = ndev->addr_assign_type; + + err = eth_mac_addr(ndev, p); + if (err != 0) + return err; + + err = rndis_filter_set_device_mac(hdev, addr->sa_data); + if (err != 0) { + /* roll back to saved MAC */ + memcpy(ndev->dev_addr, save_adr, ETH_ALEN); + ndev->addr_assign_type = save_aatype; + } + + return err; +} + + static const struct ethtool_ops ethtool_ops = { .get_drvinfo = netvsc_get_drvinfo, .get_link = ethtool_op_get_link, @@ -353,7 +381,7 @@ static const struct net_device_ops device_ops = { .ndo_set_rx_mode = netvsc_set_multicast_list, .ndo_change_mtu = netvsc_change_mtu, .ndo_validate_addr = eth_validate_addr, - .ndo_set_mac_address = eth_mac_addr, + .ndo_set_mac_address = netvsc_set_mac_addr, }; /* -- cgit v1.2.3-70-g09d2