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authoraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2009-02-05 22:36:28 +0000
committeraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2009-02-05 22:36:28 +0000
commitb6503ed9b8815ecfb82fe9faba28936365321248 (patch)
treefcd2f7c0b3102723e7595cc9215bd913f8524103 /hw/virtio-net.c
parent3831ab2094f6b573617b0f53b663bba1f036dc45 (diff)
qemu:virtio-net: Add additional MACs via a filter table (Alex Williamson)
Create a filter table and allow the guest to populate it with the MAC class control commands. We manage the size and usage of the filter table including enabling promiscuous and all-multi modes as necessary. The guest should therefore assume the table is infinite. Eventually this might allow us to bind directly to a hardware NIC and manipulate a physical MAC filter. The specifics of the TABLE_SET command are documented in virtio-net.h. Separate buffers in the same command are used for unicaste and multicast addresses for priority and sychronization. With this we can export the VIRTIO_NET_F_CTRL_RX feature bit. Signed-off-by: Alex Williamson <alex.williamson@hp.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6539 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'hw/virtio-net.c')
-rw-r--r--hw/virtio-net.c89
1 files changed, 87 insertions, 2 deletions
diff --git a/hw/virtio-net.c b/hw/virtio-net.c
index 001169d7a2..524ef37134 100644
--- a/hw/virtio-net.c
+++ b/hw/virtio-net.c
@@ -16,7 +16,9 @@
#include "qemu-timer.h"
#include "virtio-net.h"
-#define VIRTIO_NET_VM_VERSION 4
+#define VIRTIO_NET_VM_VERSION 5
+
+#define MAC_TABLE_ENTRIES 32
typedef struct VirtIONet
{
@@ -32,6 +34,10 @@ typedef struct VirtIONet
int mergeable_rx_bufs;
int promisc;
int allmulti;
+ struct {
+ int in_use;
+ uint8_t *macs;
+ } mac_table;
} VirtIONet;
/* TODO
@@ -87,13 +93,18 @@ static void virtio_net_reset(VirtIODevice *vdev)
/* Reset back to compatibility mode */
n->promisc = 1;
n->allmulti = 0;
+
+ /* Flush any MAC filter table state */
+ n->mac_table.in_use = 0;
+ memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
}
static uint32_t virtio_net_get_features(VirtIODevice *vdev)
{
uint32_t features = (1 << VIRTIO_NET_F_MAC) |
(1 << VIRTIO_NET_F_STATUS) |
- (1 << VIRTIO_NET_F_CTRL_VQ);
+ (1 << VIRTIO_NET_F_CTRL_VQ) |
+ (1 << VIRTIO_NET_F_CTRL_RX);
return features;
}
@@ -127,6 +138,53 @@ static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
return VIRTIO_NET_OK;
}
+static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
+ VirtQueueElement *elem)
+{
+ struct virtio_net_ctrl_mac mac_data;
+
+ if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET || elem->out_num != 3 ||
+ elem->out_sg[1].iov_len < sizeof(mac_data) ||
+ elem->out_sg[2].iov_len < sizeof(mac_data))
+ return VIRTIO_NET_ERR;
+
+ n->mac_table.in_use = 0;
+ memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
+
+ mac_data.entries = ldl_le_p(elem->out_sg[1].iov_base);
+
+ if (sizeof(mac_data.entries) +
+ (mac_data.entries * ETH_ALEN) > elem->out_sg[1].iov_len)
+ return VIRTIO_NET_ERR;
+
+ if (mac_data.entries <= MAC_TABLE_ENTRIES) {
+ memcpy(n->mac_table.macs, elem->out_sg[1].iov_base + sizeof(mac_data),
+ mac_data.entries * ETH_ALEN);
+ n->mac_table.in_use += mac_data.entries;
+ } else {
+ n->promisc = 1;
+ return VIRTIO_NET_OK;
+ }
+
+ mac_data.entries = ldl_le_p(elem->out_sg[2].iov_base);
+
+ if (sizeof(mac_data.entries) +
+ (mac_data.entries * ETH_ALEN) > elem->out_sg[2].iov_len)
+ return VIRTIO_NET_ERR;
+
+ if (mac_data.entries) {
+ if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
+ memcpy(n->mac_table.macs + (n->mac_table.in_use * ETH_ALEN),
+ elem->out_sg[2].iov_base + sizeof(mac_data),
+ mac_data.entries * ETH_ALEN);
+ n->mac_table.in_use += mac_data.entries;
+ } else
+ n->allmulti = 1;
+ }
+
+ return VIRTIO_NET_OK;
+}
+
static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIONet *n = to_virtio_net(vdev);
@@ -151,6 +209,8 @@ static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
if (ctrl.class == VIRTIO_NET_CTRL_RX_MODE)
status = virtio_net_handle_rx_mode(n, ctrl.cmd, &elem);
+ else if (ctrl.class == VIRTIO_NET_CTRL_MAC)
+ status = virtio_net_handle_mac(n, ctrl.cmd, &elem);
stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);
@@ -226,6 +286,7 @@ static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
{
static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
uint8_t *ptr = (uint8_t *)buf;
+ int i;
if (n->promisc)
return 1;
@@ -244,6 +305,11 @@ static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
if (!memcmp(ptr, n->mac, ETH_ALEN))
return 1;
+ for (i = 0; i < n->mac_table.in_use; i++) {
+ if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN))
+ return 1;
+ }
+
return 0;
}
@@ -406,6 +472,8 @@ static void virtio_net_save(QEMUFile *f, void *opaque)
qemu_put_be16(f, n->status);
qemu_put_be32(f, n->promisc);
qemu_put_be32(f, n->allmulti);
+ qemu_put_be32(f, n->mac_table.in_use);
+ qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN);
}
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
@@ -429,6 +497,19 @@ static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
n->allmulti = qemu_get_be32(f);
}
+ if (version_id >= 5) {
+ n->mac_table.in_use = qemu_get_be32(f);
+ /* MAC_TABLE_ENTRIES may be different from the saved image */
+ if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
+ qemu_get_buffer(f, n->mac_table.macs,
+ n->mac_table.in_use * ETH_ALEN);
+ } else if (n->mac_table.in_use) {
+ qemu_fseek(f, n->mac_table.in_use * ETH_ALEN, SEEK_CUR);
+ n->promisc = 1;
+ n->mac_table.in_use = 0;
+ }
+ }
+
if (n->tx_timer_active) {
qemu_mod_timer(n->tx_timer,
qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
@@ -474,6 +555,10 @@ void virtio_net_init(PCIBus *bus, NICInfo *nd, int devfn)
n->mergeable_rx_bufs = 0;
n->promisc = 1; /* for compatibility */
+ n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN);
+ if (!n->mac_table.macs)
+ return;
+
register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION,
virtio_net_save, virtio_net_load, n);
}