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virtio-net: introduce a new control to set macaddr 

Currently we write MAC address to pci config space byte by byte,
this means that we have an intermediate step where mac is wrong.
This patch introduced a new control command to set MAC address,
it's atomic.

VIRTIO_NET_F_CTRL_MAC_ADDR is a new feature bit for compatibility.

Signed-off-by: Amos Kong <akong@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amos Kong 2013-01-21 01:17:23 +00:00 committed by David S. Miller
parent fa0879e37b
commit 7e58d5aea8
2 changed files with 25 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/net/virtio_net.c
View File

@ -802,14 +802,28 @@ static int virtnet_set_mac_address(struct net_device *dev, void *p)
struct virtnet_info *vi = netdev_priv(dev); struct virtnet_info *vi = netdev_priv(dev);
struct virtio_device *vdev = vi->vdev; struct virtio_device *vdev = vi->vdev;
int ret; int ret;
struct sockaddr *addr = p;
struct scatterlist sg;
ret = eth_mac_addr(dev, p); ret = eth_prepare_mac_addr_change(dev, p);
if (ret) if (ret)
return ret; return ret;
if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
sg_init_one(&sg, addr->sa_data, dev->addr_len);
if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
VIRTIO_NET_CTRL_MAC_ADDR_SET,
&sg, 1, 0)) {
dev_warn(&vdev->dev,
"Failed to set mac address by vq command.\n");
return -EINVAL;
}
} else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
dev->dev_addr, dev->addr_len); addr->sa_data, dev->addr_len);
}
eth_commit_mac_addr_change(dev, p);
return 0; return 0;
} }
@ -1627,6 +1641,7 @@ static unsigned int features[] = {
VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ,
VIRTIO_NET_F_CTRL_MAC_ADDR,
}; };
static struct virtio_driver virtio_net_driver = { static struct virtio_driver virtio_net_driver = {

8
include/uapi/linux/virtio_net.h
View File

@ -53,6 +53,7 @@
* network */ * network */
#define VIRTIO_NET_F_MQ 22 /* Device supports Receive Flow #define VIRTIO_NET_F_MQ 22 /* Device supports Receive Flow
* Steering */ * Steering */
#define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */
#define VIRTIO_NET_S_LINK_UP 1 /* Link is up */ #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
#define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */ #define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */
@ -127,7 +128,7 @@ typedef __u8 virtio_net_ctrl_ack;
#define VIRTIO_NET_CTRL_RX_NOBCAST 5 #define VIRTIO_NET_CTRL_RX_NOBCAST 5
/* /*
* Control the MAC filter table. * Control the MAC
* *
* The MAC filter table is managed by the hypervisor, the guest should * The MAC filter table is managed by the hypervisor, the guest should
* assume the size is infinite. Filtering should be considered * assume the size is infinite. Filtering should be considered
@ -140,6 +141,10 @@ typedef __u8 virtio_net_ctrl_ack;
* first sg list contains unicast addresses, the second is for multicast. * first sg list contains unicast addresses, the second is for multicast.
* This functionality is present if the VIRTIO_NET_F_CTRL_RX feature * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
* is available. * is available.
*
* The ADDR_SET command requests one out scatterlist, it contains a
* 6 bytes MAC address. This functionality is present if the
* VIRTIO_NET_F_CTRL_MAC_ADDR feature is available.
*/ */
struct virtio_net_ctrl_mac { struct virtio_net_ctrl_mac {
__u32 entries; __u32 entries;
@ -148,6 +153,7 @@ struct virtio_net_ctrl_mac {
#define VIRTIO_NET_CTRL_MAC 1 #define VIRTIO_NET_CTRL_MAC 1
#define VIRTIO_NET_CTRL_MAC_TABLE_SET 0 #define VIRTIO_NET_CTRL_MAC_TABLE_SET 0
#define VIRTIO_NET_CTRL_MAC_ADDR_SET 1
/* /*
* Control VLAN filtering * Control VLAN filtering