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virtio_net: Add a MAC filter table 

Make use of the MAC control virtqueue class to support a MAC
filter table.  The filter table is managed by the hypervisor.
We consider the table to be available if the CTRL_RX feature
bit is set.  We leave it to the hypervisor to manage the table
and enable promiscuous or all-multi mode as necessary depending
on the resources available to it.

Signed-off-by: Alex Williamson <alex.williamson@hp.com>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alex Williamson 2009-02-04 09:02:45 +00:00 committed by David S. Miller
parent 2af7698e2d
commit f565a7c259
2 changed files with 70 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
drivers/net/virtio_net.c
View File

@ -37,7 +37,7 @@ module_param(gso, bool, 0444);
#define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
#define GOOD_COPY_LEN 128
#define VIRTNET_SEND_COMMAND_SG_MAX 1
#define VIRTNET_SEND_COMMAND_SG_MAX 2
struct virtnet_info
{
@ -661,31 +661,70 @@ static int virtnet_set_tx_csum(struct net_device *dev, u32 data)
static void virtnet_set_rx_mode(struct net_device *dev)
{
struct virtnet_info *vi = netdev_priv(dev);
struct scatterlist sg;
struct scatterlist sg[2];
u8 promisc, allmulti;
struct virtio_net_ctrl_mac *mac_data;
struct dev_addr_list *addr;
void *buf;
int i;
/* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
return;
promisc = ((dev->flags & IFF_PROMISC) != 0 || dev->uc_count > 0);
allmulti = ((dev->flags & IFF_ALLMULTI) != 0 || dev->mc_count > 0);
promisc = ((dev->flags & IFF_PROMISC) != 0);
allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
sg_set_buf(&sg, &promisc, sizeof(promisc));
sg_set_buf(sg, &promisc, sizeof(promisc));
if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
VIRTIO_NET_CTRL_RX_PROMISC,
&sg, 1, 0))
sg, 1, 0))
dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
promisc ? "en" : "dis");
sg_set_buf(&sg, &allmulti, sizeof(allmulti));
sg_set_buf(sg, &allmulti, sizeof(allmulti));
if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
VIRTIO_NET_CTRL_RX_ALLMULTI,
&sg, 1, 0))
sg, 1, 0))
dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
allmulti ? "en" : "dis");
/* MAC filter - use one buffer for both lists */
mac_data = buf = kzalloc(((dev->uc_count + dev->mc_count) * ETH_ALEN) +
(2 * sizeof(mac_data->entries)), GFP_ATOMIC);
if (!buf) {
dev_warn(&dev->dev, "No memory for MAC address buffer\n");
return;
}
/* Store the unicast list and count in the front of the buffer */
mac_data->entries = dev->uc_count;
addr = dev->uc_list;
for (i = 0; i < dev->uc_count; i++, addr = addr->next)
memcpy(&mac_data->macs[i][0], addr->da_addr, ETH_ALEN);
sg_set_buf(&sg[0], mac_data,
sizeof(mac_data->entries) + (dev->uc_count * ETH_ALEN));
/* multicast list and count fill the end */
mac_data = (void *)&mac_data->macs[dev->uc_count][0];
mac_data->entries = dev->mc_count;
addr = dev->mc_list;
for (i = 0; i < dev->mc_count; i++, addr = addr->next)
memcpy(&mac_data->macs[i][0], addr->da_addr, ETH_ALEN);
sg_set_buf(&sg[1], mac_data,
sizeof(mac_data->entries) + (dev->mc_count * ETH_ALEN));
if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
VIRTIO_NET_CTRL_MAC_TABLE_SET,
sg, 2, 0))
dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
kfree(buf);
}
static struct ethtool_ops virtnet_ethtool_ops = {

23
include/linux/virtio_net.h
View File

@ -88,4 +88,27 @@ typedef __u8 virtio_net_ctrl_ack;
#define VIRTIO_NET_CTRL_RX_PROMISC 0
#define VIRTIO_NET_CTRL_RX_ALLMULTI 1
/*
* Control the MAC filter table.
*
* The MAC filter table is managed by the hypervisor, the guest should
* assume the size is infinite. Filtering should be considered
* non-perfect, ie. based on hypervisor resources, the guest may
* received packets from sources not specified in the filter list.
*
* In addition to the class/cmd header, the TABLE_SET command requires
* two out scatterlists. Each contains a 4 byte count of entries followed
* by a concatenated byte stream of the ETH_ALEN MAC addresses. The
* first sg list contains unicast addresses, the second is for multicast.
* This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
* is available.
*/
struct virtio_net_ctrl_mac {
__u32 entries;
__u8 macs[][ETH_ALEN];
} __attribute__((packed));
#define VIRTIO_NET_CTRL_MAC 1
#define VIRTIO_NET_CTRL_MAC_TABLE_SET 0
#endif /* _LINUX_VIRTIO_NET_H */