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/*
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* Virtio Network Device
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*
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* Copyright IBM, Corp. 2007
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "virtio.h" |
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#include "net.h" |
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#include "qemu-timer.h" |
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#include "virtio-net.h" |
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#define VIRTIO_NET_VM_VERSION 6 |
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#define MAC_TABLE_ENTRIES 32 |
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#define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ |
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typedef struct VirtIONet |
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{ |
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VirtIODevice vdev; |
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uint8_t mac[ETH_ALEN]; |
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uint16_t status; |
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VirtQueue *rx_vq; |
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VirtQueue *tx_vq; |
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VirtQueue *ctrl_vq; |
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VLANClientState *vc; |
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QEMUTimer *tx_timer; |
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int tx_timer_active;
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int mergeable_rx_bufs;
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int promisc;
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int allmulti;
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struct {
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int in_use;
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uint8_t *macs; |
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} mac_table; |
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uint32_t *vlans; |
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} VirtIONet; |
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/* TODO
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* - we could suppress RX interrupt if we were so inclined.
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*/
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static VirtIONet *to_virtio_net(VirtIODevice *vdev)
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{ |
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return (VirtIONet *)vdev;
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} |
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static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) |
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{ |
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VirtIONet *n = to_virtio_net(vdev); |
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struct virtio_net_config netcfg;
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netcfg.status = n->status; |
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memcpy(netcfg.mac, n->mac, ETH_ALEN); |
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memcpy(config, &netcfg, sizeof(netcfg));
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} |
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static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) |
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{ |
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VirtIONet *n = to_virtio_net(vdev); |
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struct virtio_net_config netcfg;
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memcpy(&netcfg, config, sizeof(netcfg));
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if (memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
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memcpy(n->mac, netcfg.mac, ETH_ALEN); |
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qemu_format_nic_info_str(n->vc, n->mac); |
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} |
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} |
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static void virtio_net_set_link_status(VLANClientState *vc) |
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{ |
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VirtIONet *n = vc->opaque; |
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uint16_t old_status = n->status; |
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if (vc->link_down)
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n->status &= ~VIRTIO_NET_S_LINK_UP; |
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else
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n->status |= VIRTIO_NET_S_LINK_UP; |
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if (n->status != old_status)
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virtio_notify_config(&n->vdev); |
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} |
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static void virtio_net_reset(VirtIODevice *vdev) |
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{ |
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VirtIONet *n = to_virtio_net(vdev); |
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/* Reset back to compatibility mode */
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n->promisc = 1;
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n->allmulti = 0;
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/* Flush any MAC and VLAN filter table state */
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n->mac_table.in_use = 0;
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memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
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memset(n->vlans, 0, MAX_VLAN >> 3); |
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} |
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static uint32_t virtio_net_get_features(VirtIODevice *vdev)
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{ |
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uint32_t features = (1 << VIRTIO_NET_F_MAC) |
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(1 << VIRTIO_NET_F_STATUS) |
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(1 << VIRTIO_NET_F_CTRL_VQ) |
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(1 << VIRTIO_NET_F_CTRL_RX) |
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(1 << VIRTIO_NET_F_CTRL_VLAN);
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return features;
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} |
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static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features) |
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{ |
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VirtIONet *n = to_virtio_net(vdev); |
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n->mergeable_rx_bufs = !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF));
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} |
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static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, |
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VirtQueueElement *elem) |
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{ |
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uint8_t on; |
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if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(on)) { |
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fprintf(stderr, "virtio-net ctrl invalid rx mode command\n");
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exit(1);
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} |
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on = ldub_p(elem->out_sg[1].iov_base);
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if (cmd == VIRTIO_NET_CTRL_RX_MODE_PROMISC)
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n->promisc = on; |
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else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLMULTI) |
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n->allmulti = on; |
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else
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return VIRTIO_NET_ERR;
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return VIRTIO_NET_OK;
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} |
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static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, |
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VirtQueueElement *elem) |
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{ |
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struct virtio_net_ctrl_mac mac_data;
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if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET || elem->out_num != 3 || |
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elem->out_sg[1].iov_len < sizeof(mac_data) || |
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elem->out_sg[2].iov_len < sizeof(mac_data)) |
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return VIRTIO_NET_ERR;
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n->mac_table.in_use = 0;
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memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
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mac_data.entries = ldl_le_p(elem->out_sg[1].iov_base);
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if (sizeof(mac_data.entries) + |
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(mac_data.entries * ETH_ALEN) > elem->out_sg[1].iov_len)
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return VIRTIO_NET_ERR;
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if (mac_data.entries <= MAC_TABLE_ENTRIES) {
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memcpy(n->mac_table.macs, elem->out_sg[1].iov_base + sizeof(mac_data), |
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mac_data.entries * ETH_ALEN); |
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n->mac_table.in_use += mac_data.entries; |
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} else {
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n->promisc = 1;
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return VIRTIO_NET_OK;
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} |
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mac_data.entries = ldl_le_p(elem->out_sg[2].iov_base);
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if (sizeof(mac_data.entries) + |
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(mac_data.entries * ETH_ALEN) > elem->out_sg[2].iov_len)
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return VIRTIO_NET_ERR;
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if (mac_data.entries) {
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if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
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memcpy(n->mac_table.macs + (n->mac_table.in_use * ETH_ALEN), |
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elem->out_sg[2].iov_base + sizeof(mac_data), |
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mac_data.entries * ETH_ALEN); |
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n->mac_table.in_use += mac_data.entries; |
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} else
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n->allmulti = 1;
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} |
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return VIRTIO_NET_OK;
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} |
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static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, |
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VirtQueueElement *elem) |
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{ |
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uint16_t vid; |
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if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(vid)) { |
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fprintf(stderr, "virtio-net ctrl invalid vlan command\n");
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return VIRTIO_NET_ERR;
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} |
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vid = lduw_le_p(elem->out_sg[1].iov_base);
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if (vid >= MAX_VLAN)
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return VIRTIO_NET_ERR;
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if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
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n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); |
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else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) |
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n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); |
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else
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return VIRTIO_NET_ERR;
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return VIRTIO_NET_OK;
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} |
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static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) |
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{ |
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VirtIONet *n = to_virtio_net(vdev); |
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struct virtio_net_ctrl_hdr ctrl;
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virtio_net_ctrl_ack status = VIRTIO_NET_ERR; |
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VirtQueueElement elem; |
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while (virtqueue_pop(vq, &elem)) {
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if ((elem.in_num < 1) || (elem.out_num < 1)) { |
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fprintf(stderr, "virtio-net ctrl missing headers\n");
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exit(1);
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} |
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if (elem.out_sg[0].iov_len < sizeof(ctrl) || |
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elem.out_sg[elem.in_num - 1].iov_len < sizeof(status)) { |
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fprintf(stderr, "virtio-net ctrl header not in correct element\n");
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exit(1);
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} |
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ctrl.class = ldub_p(elem.out_sg[0].iov_base);
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ctrl.cmd = ldub_p(elem.out_sg[0].iov_base + sizeof(ctrl.class)); |
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if (ctrl.class == VIRTIO_NET_CTRL_RX_MODE)
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status = virtio_net_handle_rx_mode(n, ctrl.cmd, &elem); |
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else if (ctrl.class == VIRTIO_NET_CTRL_MAC) |
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status = virtio_net_handle_mac(n, ctrl.cmd, &elem); |
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else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) |
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status = virtio_net_handle_vlan_table(n, ctrl.cmd, &elem); |
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stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);
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virtqueue_push(vq, &elem, sizeof(status));
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virtio_notify(vdev, vq); |
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} |
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} |
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/* RX */
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static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) |
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{ |
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} |
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static int do_virtio_net_can_receive(VirtIONet *n, int bufsize) |
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{ |
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if (!virtio_queue_ready(n->rx_vq) ||
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!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) |
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return 0; |
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if (virtio_queue_empty(n->rx_vq) ||
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(n->mergeable_rx_bufs && |
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!virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
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virtio_queue_set_notification(n->rx_vq, 1);
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return 0; |
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} |
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virtio_queue_set_notification(n->rx_vq, 0);
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return 1; |
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} |
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static int virtio_net_can_receive(void *opaque) |
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{ |
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VirtIONet *n = opaque; |
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return do_virtio_net_can_receive(n, VIRTIO_NET_MAX_BUFSIZE);
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} |
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static int iov_fill(struct iovec *iov, int iovcnt, const void *buf, int count) |
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{ |
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int offset, i;
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offset = i = 0;
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while (offset < count && i < iovcnt) {
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int len = MIN(iov[i].iov_len, count - offset);
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memcpy(iov[i].iov_base, buf + offset, len); |
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offset += len; |
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i++; |
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} |
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return offset;
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} |
297 |
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static int receive_header(VirtIONet *n, struct iovec *iov, int iovcnt, |
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const void *buf, size_t size, size_t hdr_len) |
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{ |
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struct virtio_net_hdr *hdr = iov[0].iov_base; |
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int offset = 0; |
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hdr->flags = 0;
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hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; |
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/* We only ever receive a struct virtio_net_hdr from the tapfd,
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* but we may be passing along a larger header to the guest.
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*/
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iov[0].iov_base += hdr_len;
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iov[0].iov_len -= hdr_len;
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return offset;
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} |
315 |
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static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) |
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{ |
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static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
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static const uint8_t vlan[] = {0x81, 0x00}; |
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uint8_t *ptr = (uint8_t *)buf; |
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int i;
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if (n->promisc)
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return 1; |
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#ifdef TAP_VNET_HDR
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if (tap_has_vnet_hdr(n->vc->vlan->first_client))
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ptr += sizeof(struct virtio_net_hdr); |
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#endif
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if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { |
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int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; |
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if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) |
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return 0; |
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} |
336 |
|
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if ((ptr[0] & 1) && n->allmulti) |
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return 1; |
339 |
|
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if (!memcmp(ptr, bcast, sizeof(bcast))) |
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return 1; |
342 |
|
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if (!memcmp(ptr, n->mac, ETH_ALEN))
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return 1; |
345 |
|
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for (i = 0; i < n->mac_table.in_use; i++) { |
347 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN))
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return 1; |
349 |
} |
350 |
|
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return 0; |
352 |
} |
353 |
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static void virtio_net_receive(void *opaque, const uint8_t *buf, int size) |
355 |
{ |
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VirtIONet *n = opaque; |
357 |
struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL; |
358 |
size_t hdr_len, offset, i; |
359 |
|
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if (!do_virtio_net_can_receive(n, size))
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return;
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|
363 |
if (!receive_filter(n, buf, size))
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return;
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365 |
|
366 |
/* hdr_len refers to the header we supply to the guest */
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hdr_len = n->mergeable_rx_bufs ? |
368 |
sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); |
369 |
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offset = i = 0;
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371 |
|
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while (offset < size) {
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VirtQueueElement elem; |
374 |
int len, total;
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struct iovec sg[VIRTQUEUE_MAX_SIZE];
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376 |
|
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len = total = 0;
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378 |
|
379 |
if ((i != 0 && !n->mergeable_rx_bufs) || |
380 |
virtqueue_pop(n->rx_vq, &elem) == 0) {
|
381 |
if (i == 0) |
382 |
return;
|
383 |
fprintf(stderr, "virtio-net truncating packet\n");
|
384 |
exit(1);
|
385 |
} |
386 |
|
387 |
if (elem.in_num < 1) { |
388 |
fprintf(stderr, "virtio-net receive queue contains no in buffers\n");
|
389 |
exit(1);
|
390 |
} |
391 |
|
392 |
if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != hdr_len) { |
393 |
fprintf(stderr, "virtio-net header not in first element\n");
|
394 |
exit(1);
|
395 |
} |
396 |
|
397 |
memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num); |
398 |
|
399 |
if (i == 0) { |
400 |
if (n->mergeable_rx_bufs)
|
401 |
mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base; |
402 |
|
403 |
offset += receive_header(n, sg, elem.in_num, |
404 |
buf + offset, size - offset, hdr_len); |
405 |
total += hdr_len; |
406 |
} |
407 |
|
408 |
/* copy in packet. ugh */
|
409 |
len = iov_fill(sg, elem.in_num, |
410 |
buf + offset, size - offset); |
411 |
total += len; |
412 |
|
413 |
/* signal other side */
|
414 |
virtqueue_fill(n->rx_vq, &elem, total, i++); |
415 |
|
416 |
offset += len; |
417 |
} |
418 |
|
419 |
if (mhdr)
|
420 |
mhdr->num_buffers = i; |
421 |
|
422 |
virtqueue_flush(n->rx_vq, i); |
423 |
virtio_notify(&n->vdev, n->rx_vq); |
424 |
} |
425 |
|
426 |
/* TX */
|
427 |
static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq) |
428 |
{ |
429 |
VirtQueueElement elem; |
430 |
int has_vnet_hdr = 0; |
431 |
|
432 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
433 |
return;
|
434 |
|
435 |
while (virtqueue_pop(vq, &elem)) {
|
436 |
ssize_t len = 0;
|
437 |
unsigned int out_num = elem.out_num; |
438 |
struct iovec *out_sg = &elem.out_sg[0]; |
439 |
unsigned hdr_len;
|
440 |
|
441 |
/* hdr_len refers to the header received from the guest */
|
442 |
hdr_len = n->mergeable_rx_bufs ? |
443 |
sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
444 |
sizeof(struct virtio_net_hdr); |
445 |
|
446 |
if (out_num < 1 || out_sg->iov_len != hdr_len) { |
447 |
fprintf(stderr, "virtio-net header not in first element\n");
|
448 |
exit(1);
|
449 |
} |
450 |
|
451 |
/* ignore the header if GSO is not supported */
|
452 |
if (!has_vnet_hdr) {
|
453 |
out_num--; |
454 |
out_sg++; |
455 |
len += hdr_len; |
456 |
} else if (n->mergeable_rx_bufs) { |
457 |
/* tapfd expects a struct virtio_net_hdr */
|
458 |
hdr_len -= sizeof(struct virtio_net_hdr); |
459 |
out_sg->iov_len -= hdr_len; |
460 |
len += hdr_len; |
461 |
} |
462 |
|
463 |
len += qemu_sendv_packet(n->vc, out_sg, out_num); |
464 |
|
465 |
virtqueue_push(vq, &elem, len); |
466 |
virtio_notify(&n->vdev, vq); |
467 |
} |
468 |
} |
469 |
|
470 |
static void virtio_net_handle_tx(VirtIODevice *vdev, VirtQueue *vq) |
471 |
{ |
472 |
VirtIONet *n = to_virtio_net(vdev); |
473 |
|
474 |
if (n->tx_timer_active) {
|
475 |
virtio_queue_set_notification(vq, 1);
|
476 |
qemu_del_timer(n->tx_timer); |
477 |
n->tx_timer_active = 0;
|
478 |
virtio_net_flush_tx(n, vq); |
479 |
} else {
|
480 |
qemu_mod_timer(n->tx_timer, |
481 |
qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL); |
482 |
n->tx_timer_active = 1;
|
483 |
virtio_queue_set_notification(vq, 0);
|
484 |
} |
485 |
} |
486 |
|
487 |
static void virtio_net_tx_timer(void *opaque) |
488 |
{ |
489 |
VirtIONet *n = opaque; |
490 |
|
491 |
n->tx_timer_active = 0;
|
492 |
|
493 |
/* Just in case the driver is not ready on more */
|
494 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
495 |
return;
|
496 |
|
497 |
virtio_queue_set_notification(n->tx_vq, 1);
|
498 |
virtio_net_flush_tx(n, n->tx_vq); |
499 |
} |
500 |
|
501 |
static void virtio_net_save(QEMUFile *f, void *opaque) |
502 |
{ |
503 |
VirtIONet *n = opaque; |
504 |
|
505 |
virtio_save(&n->vdev, f); |
506 |
|
507 |
qemu_put_buffer(f, n->mac, ETH_ALEN); |
508 |
qemu_put_be32(f, n->tx_timer_active); |
509 |
qemu_put_be32(f, n->mergeable_rx_bufs); |
510 |
qemu_put_be16(f, n->status); |
511 |
qemu_put_be32(f, n->promisc); |
512 |
qemu_put_be32(f, n->allmulti); |
513 |
qemu_put_be32(f, n->mac_table.in_use); |
514 |
qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); |
515 |
qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
516 |
} |
517 |
|
518 |
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) |
519 |
{ |
520 |
VirtIONet *n = opaque; |
521 |
|
522 |
if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) |
523 |
return -EINVAL;
|
524 |
|
525 |
virtio_load(&n->vdev, f); |
526 |
|
527 |
qemu_get_buffer(f, n->mac, ETH_ALEN); |
528 |
n->tx_timer_active = qemu_get_be32(f); |
529 |
n->mergeable_rx_bufs = qemu_get_be32(f); |
530 |
|
531 |
if (version_id >= 3) |
532 |
n->status = qemu_get_be16(f); |
533 |
|
534 |
if (version_id >= 4) { |
535 |
n->promisc = qemu_get_be32(f); |
536 |
n->allmulti = qemu_get_be32(f); |
537 |
} |
538 |
|
539 |
if (version_id >= 5) { |
540 |
n->mac_table.in_use = qemu_get_be32(f); |
541 |
/* MAC_TABLE_ENTRIES may be different from the saved image */
|
542 |
if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
|
543 |
qemu_get_buffer(f, n->mac_table.macs, |
544 |
n->mac_table.in_use * ETH_ALEN); |
545 |
} else if (n->mac_table.in_use) { |
546 |
qemu_fseek(f, n->mac_table.in_use * ETH_ALEN, SEEK_CUR); |
547 |
n->promisc = 1;
|
548 |
n->mac_table.in_use = 0;
|
549 |
} |
550 |
} |
551 |
|
552 |
if (version_id >= 6) |
553 |
qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
554 |
|
555 |
if (n->tx_timer_active) {
|
556 |
qemu_mod_timer(n->tx_timer, |
557 |
qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL); |
558 |
} |
559 |
|
560 |
return 0; |
561 |
} |
562 |
|
563 |
PCIDevice *virtio_net_init(PCIBus *bus, NICInfo *nd, int devfn)
|
564 |
{ |
565 |
VirtIONet *n; |
566 |
static int virtio_net_id; |
567 |
|
568 |
n = (VirtIONet *)virtio_init_pci(bus, "virtio-net",
|
569 |
PCI_VENDOR_ID_REDHAT_QUMRANET, |
570 |
PCI_DEVICE_ID_VIRTIO_NET, |
571 |
PCI_VENDOR_ID_REDHAT_QUMRANET, |
572 |
VIRTIO_ID_NET, |
573 |
PCI_CLASS_NETWORK_ETHERNET, 0x00,
|
574 |
sizeof(struct virtio_net_config), |
575 |
sizeof(VirtIONet));
|
576 |
if (!n)
|
577 |
return NULL; |
578 |
|
579 |
n->vdev.get_config = virtio_net_get_config; |
580 |
n->vdev.set_config = virtio_net_set_config; |
581 |
n->vdev.get_features = virtio_net_get_features; |
582 |
n->vdev.set_features = virtio_net_set_features; |
583 |
n->vdev.reset = virtio_net_reset; |
584 |
n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
|
585 |
n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx);
|
586 |
n->ctrl_vq = virtio_add_queue(&n->vdev, 16, virtio_net_handle_ctrl);
|
587 |
memcpy(n->mac, nd->macaddr, ETH_ALEN); |
588 |
n->status = VIRTIO_NET_S_LINK_UP; |
589 |
n->vc = qemu_new_vlan_client(nd->vlan, nd->model, nd->name, |
590 |
virtio_net_receive, virtio_net_can_receive, n); |
591 |
n->vc->link_status_changed = virtio_net_set_link_status; |
592 |
|
593 |
qemu_format_nic_info_str(n->vc, n->mac); |
594 |
|
595 |
n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n); |
596 |
n->tx_timer_active = 0;
|
597 |
n->mergeable_rx_bufs = 0;
|
598 |
n->promisc = 1; /* for compatibility */ |
599 |
|
600 |
n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN); |
601 |
|
602 |
n->vlans = qemu_mallocz(MAX_VLAN >> 3);
|
603 |
|
604 |
register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION,
|
605 |
virtio_net_save, virtio_net_load, n); |
606 |
return (PCIDevice *)n;
|
607 |
} |