/* * Virtio Network Device * * Copyright IBM, Corp. 2007 * * Authors: * Anthony Liguori <aliguori@us.ibm.com> * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. * */ #include "qemu/iov.h" #include "virtio.h" #include "net/net.h" #include "net/checksum.h" #include "net/tap.h" #include "qemu/error-report.h" #include "qemu/timer.h" #include "virtio-net.h" #include "vhost_net.h" #define VIRTIO_NET_VM_VERSION 11 #define MAC_TABLE_ENTRIES 64 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ typedef struct VirtIONet { VirtIODevice vdev; uint8_t mac[ETH_ALEN]; uint16_t status; VirtQueue *rx_vq; VirtQueue *tx_vq; VirtQueue *ctrl_vq; NICState *nic; QEMUTimer *tx_timer; QEMUBH *tx_bh; uint32_t tx_timeout; int32_t tx_burst; int tx_waiting; uint32_t has_vnet_hdr; size_t host_hdr_len; size_t guest_hdr_len; uint8_t has_ufo; struct { VirtQueueElement elem; ssize_t len; } async_tx; int mergeable_rx_bufs; uint8_t promisc; uint8_t allmulti; uint8_t alluni; uint8_t nomulti; uint8_t nouni; uint8_t nobcast; uint8_t vhost_started; struct { int in_use; int first_multi; uint8_t multi_overflow; uint8_t uni_overflow; uint8_t *macs; } mac_table; uint32_t *vlans; DeviceState *qdev; } VirtIONet; /* TODO * - we could suppress RX interrupt if we were so inclined. */ static VirtIONet *to_virtio_net(VirtIODevice *vdev) { return (VirtIONet *)vdev; } static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) { VirtIONet *n = to_virtio_net(vdev); struct virtio_net_config netcfg; stw_p(&netcfg.status, n->status); memcpy(netcfg.mac, n->mac, ETH_ALEN); memcpy(config, &netcfg, sizeof(netcfg)); } static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) { VirtIONet *n = to_virtio_net(vdev); struct virtio_net_config netcfg; memcpy(&netcfg, config, sizeof(netcfg)); if (memcmp(netcfg.mac, n->mac, ETH_ALEN)) { memcpy(n->mac, netcfg.mac, ETH_ALEN); qemu_format_nic_info_str(&n->nic->nc, n->mac); } } static bool virtio_net_started(VirtIONet *n, uint8_t status) { return (status & VIRTIO_CONFIG_S_DRIVER_OK) && (n->status & VIRTIO_NET_S_LINK_UP) && n->vdev.vm_running; } static void virtio_net_vhost_status(VirtIONet *n, uint8_t status) { if (!n->nic->nc.peer) { return; } if (n->nic->nc.peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { return; } if (!tap_get_vhost_net(n->nic->nc.peer)) { return; } if (!!n->vhost_started == virtio_net_started(n, status) && !n->nic->nc.peer->link_down) { return; } if (!n->vhost_started) { int r; if (!vhost_net_query(tap_get_vhost_net(n->nic->nc.peer), &n->vdev)) { return; } r = vhost_net_start(tap_get_vhost_net(n->nic->nc.peer), &n->vdev); if (r < 0) { error_report("unable to start vhost net: %d: " "falling back on userspace virtio", -r); } else { n->vhost_started = 1; } } else { vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), &n->vdev); n->vhost_started = 0; } } static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) { VirtIONet *n = to_virtio_net(vdev); virtio_net_vhost_status(n, status); if (!n->tx_waiting) { return; } if (virtio_net_started(n, status) && !n->vhost_started) { if (n->tx_timer) { qemu_mod_timer(n->tx_timer, qemu_get_clock_ns(vm_clock) + n->tx_timeout); } else { qemu_bh_schedule(n->tx_bh); } } else { if (n->tx_timer) { qemu_del_timer(n->tx_timer); } else { qemu_bh_cancel(n->tx_bh); } } } static void virtio_net_set_link_status(NetClientState *nc) { VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; uint16_t old_status = n->status; if (nc->link_down) n->status &= ~VIRTIO_NET_S_LINK_UP; else n->status |= VIRTIO_NET_S_LINK_UP; if (n->status != old_status) virtio_notify_config(&n->vdev); virtio_net_set_status(&n->vdev, n->vdev.status); } static void virtio_net_reset(VirtIODevice *vdev) { VirtIONet *n = to_virtio_net(vdev); /* Reset back to compatibility mode */ n->promisc = 1; n->allmulti = 0; n->alluni = 0; n->nomulti = 0; n->nouni = 0; n->nobcast = 0; /* Flush any MAC and VLAN filter table state */ n->mac_table.in_use = 0; n->mac_table.first_multi = 0; n->mac_table.multi_overflow = 0; n->mac_table.uni_overflow = 0; memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); memset(n->vlans, 0, MAX_VLAN >> 3); } static void peer_test_vnet_hdr(VirtIONet *n) { if (!n->nic->nc.peer) return; if (n->nic->nc.peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) return; n->has_vnet_hdr = tap_has_vnet_hdr(n->nic->nc.peer); } static int peer_has_vnet_hdr(VirtIONet *n) { return n->has_vnet_hdr; } static int peer_has_ufo(VirtIONet *n) { if (!peer_has_vnet_hdr(n)) return 0; n->has_ufo = tap_has_ufo(n->nic->nc.peer); return n->has_ufo; } static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs) { n->mergeable_rx_bufs = mergeable_rx_bufs; n->guest_hdr_len = n->mergeable_rx_bufs ? sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); if (peer_has_vnet_hdr(n) && tap_has_vnet_hdr_len(n->nic->nc.peer, n->guest_hdr_len)) { tap_set_vnet_hdr_len(n->nic->nc.peer, n->guest_hdr_len); n->host_hdr_len = n->guest_hdr_len; } } static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features) { VirtIONet *n = to_virtio_net(vdev); features |= (1 << VIRTIO_NET_F_MAC); if (!peer_has_vnet_hdr(n)) { features &= ~(0x1 << VIRTIO_NET_F_CSUM); features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO4); features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO6); features &= ~(0x1 << VIRTIO_NET_F_HOST_ECN); features &= ~(0x1 << VIRTIO_NET_F_GUEST_CSUM); features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO4); features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO6); features &= ~(0x1 << VIRTIO_NET_F_GUEST_ECN); } if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) { features &= ~(0x1 << VIRTIO_NET_F_GUEST_UFO); features &= ~(0x1 << VIRTIO_NET_F_HOST_UFO); } if (!n->nic->nc.peer || n->nic->nc.peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { return features; } if (!tap_get_vhost_net(n->nic->nc.peer)) { return features; } return vhost_net_get_features(tap_get_vhost_net(n->nic->nc.peer), features); } static uint32_t virtio_net_bad_features(VirtIODevice *vdev) { uint32_t features = 0; /* Linux kernel 2.6.25. It understood MAC (as everyone must), * but also these: */ features |= (1 << VIRTIO_NET_F_MAC); features |= (1 << VIRTIO_NET_F_CSUM); features |= (1 << VIRTIO_NET_F_HOST_TSO4); features |= (1 << VIRTIO_NET_F_HOST_TSO6); features |= (1 << VIRTIO_NET_F_HOST_ECN); return features; } static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features) { VirtIONet *n = to_virtio_net(vdev); virtio_net_set_mrg_rx_bufs(n, !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF))); if (n->has_vnet_hdr) { tap_set_offload(n->nic->nc.peer, (features >> VIRTIO_NET_F_GUEST_CSUM) & 1, (features >> VIRTIO_NET_F_GUEST_TSO4) & 1, (features >> VIRTIO_NET_F_GUEST_TSO6) & 1, (features >> VIRTIO_NET_F_GUEST_ECN) & 1, (features >> VIRTIO_NET_F_GUEST_UFO) & 1); } if (!n->nic->nc.peer || n->nic->nc.peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { return; } if (!tap_get_vhost_net(n->nic->nc.peer)) { return; } vhost_net_ack_features(tap_get_vhost_net(n->nic->nc.peer), features); } static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, VirtQueueElement *elem) { uint8_t on; if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(on)) { error_report("virtio-net ctrl invalid rx mode command"); exit(1); } on = ldub_p(elem->out_sg[1].iov_base); if (cmd == VIRTIO_NET_CTRL_RX_MODE_PROMISC) n->promisc = on; else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLMULTI) n->allmulti = on; else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLUNI) n->alluni = on; else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOMULTI) n->nomulti = on; else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOUNI) n->nouni = on; else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOBCAST) n->nobcast = on; else return VIRTIO_NET_ERR; 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; n->mac_table.first_multi = 0; n->mac_table.uni_overflow = 0; n->mac_table.multi_overflow = 0; memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); mac_data.entries = ldl_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->mac_table.uni_overflow = 1; } n->mac_table.first_multi = n->mac_table.in_use; mac_data.entries = ldl_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->mac_table.multi_overflow = 1; } } return VIRTIO_NET_OK; } static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, VirtQueueElement *elem) { uint16_t vid; if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(vid)) { error_report("virtio-net ctrl invalid vlan command"); return VIRTIO_NET_ERR; } vid = lduw_p(elem->out_sg[1].iov_base); if (vid >= MAX_VLAN) return VIRTIO_NET_ERR; if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); else return VIRTIO_NET_ERR; return VIRTIO_NET_OK; } static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) { VirtIONet *n = to_virtio_net(vdev); struct virtio_net_ctrl_hdr ctrl; virtio_net_ctrl_ack status = VIRTIO_NET_ERR; VirtQueueElement elem; while (virtqueue_pop(vq, &elem)) { if ((elem.in_num < 1) || (elem.out_num < 1)) { error_report("virtio-net ctrl missing headers"); exit(1); } if (elem.out_sg[0].iov_len < sizeof(ctrl) || elem.in_sg[elem.in_num - 1].iov_len < sizeof(status)) { error_report("virtio-net ctrl header not in correct element"); exit(1); } ctrl.class = ldub_p(elem.out_sg[0].iov_base); ctrl.cmd = ldub_p(elem.out_sg[0].iov_base + sizeof(ctrl.class)); 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); else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) status = virtio_net_handle_vlan_table(n, ctrl.cmd, &elem); stb_p(elem.in_sg[elem.in_num - 1].iov_base, status); virtqueue_push(vq, &elem, sizeof(status)); virtio_notify(vdev, vq); } } /* RX */ static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) { VirtIONet *n = to_virtio_net(vdev); qemu_flush_queued_packets(&n->nic->nc); } static int virtio_net_can_receive(NetClientState *nc) { VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; if (!n->vdev.vm_running) { return 0; } if (!virtio_queue_ready(n->rx_vq) || !(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) return 0; return 1; } static int virtio_net_has_buffers(VirtIONet *n, int bufsize) { if (virtio_queue_empty(n->rx_vq) || (n->mergeable_rx_bufs && !virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) { virtio_queue_set_notification(n->rx_vq, 1); /* To avoid a race condition where the guest has made some buffers * available after the above check but before notification was * enabled, check for available buffers again. */ if (virtio_queue_empty(n->rx_vq) || (n->mergeable_rx_bufs && !virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) return 0; } virtio_queue_set_notification(n->rx_vq, 0); return 1; } /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so * it never finds out that the packets don't have valid checksums. This * causes dhclient to get upset. Fedora's carried a patch for ages to * fix this with Xen but it hasn't appeared in an upstream release of * dhclient yet. * * To avoid breaking existing guests, we catch udp packets and add * checksums. This is terrible but it's better than hacking the guest * kernels. * * N.B. if we introduce a zero-copy API, this operation is no longer free so * we should provide a mechanism to disable it to avoid polluting the host * cache. */ static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, uint8_t *buf, size_t size) { if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ (size > 27 && size < 1500) && /* normal sized MTU */ (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ (buf[23] == 17) && /* ip.protocol == UDP */ (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ net_checksum_calculate(buf, size); hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; } } static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, const void *buf, size_t size) { if (n->has_vnet_hdr) { /* FIXME this cast is evil */ void *wbuf = (void *)buf; work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, size - n->host_hdr_len); iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); } else { struct virtio_net_hdr hdr = { .flags = 0, .gso_type = VIRTIO_NET_HDR_GSO_NONE }; iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); } } static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) { static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; static const uint8_t vlan[] = {0x81, 0x00}; uint8_t *ptr = (uint8_t *)buf; int i; if (n->promisc) return 1; ptr += n->host_hdr_len; if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) return 0; } if (ptr[0] & 1) { // multicast if (!memcmp(ptr, bcast, sizeof(bcast))) { return !n->nobcast; } else if (n->nomulti) { return 0; } else if (n->allmulti || n->mac_table.multi_overflow) { return 1; } for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { return 1; } } } else { // unicast if (n->nouni) { return 0; } else if (n->alluni || n->mac_table.uni_overflow) { return 1; } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { return 1; } for (i = 0; i < n->mac_table.first_multi; i++) { if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { return 1; } } } return 0; } static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size) { VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; struct virtio_net_hdr_mrg_rxbuf mhdr; unsigned mhdr_cnt = 0; size_t offset, i, guest_offset; if (!virtio_net_can_receive(&n->nic->nc)) return -1; /* hdr_len refers to the header we supply to the guest */ if (!virtio_net_has_buffers(n, size + n->guest_hdr_len - n->host_hdr_len)) return 0; if (!receive_filter(n, buf, size)) return size; offset = i = 0; while (offset < size) { VirtQueueElement elem; int len, total; const struct iovec *sg = elem.in_sg; total = 0; if (virtqueue_pop(n->rx_vq, &elem) == 0) { if (i == 0) return -1; error_report("virtio-net unexpected empty queue: " "i %zd mergeable %d offset %zd, size %zd, " "guest hdr len %zd, host hdr len %zd guest features 0x%x", i, n->mergeable_rx_bufs, offset, size, n->guest_hdr_len, n->host_hdr_len, n->vdev.guest_features); exit(1); } if (elem.in_num < 1) { error_report("virtio-net receive queue contains no in buffers"); exit(1); } if (i == 0) { assert(offset == 0); if (n->mergeable_rx_bufs) { mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), sg, elem.in_num, offsetof(typeof(mhdr), num_buffers), sizeof(mhdr.num_buffers)); } receive_header(n, sg, elem.in_num, buf, size); offset = n->host_hdr_len; total += n->guest_hdr_len; guest_offset = n->guest_hdr_len; } else { guest_offset = 0; } /* copy in packet. ugh */ len = iov_from_buf(sg, elem.in_num, guest_offset, buf + offset, size - offset); total += len; offset += len; /* If buffers can't be merged, at this point we * must have consumed the complete packet. * Otherwise, drop it. */ if (!n->mergeable_rx_bufs && offset < size) { #if 0 error_report("virtio-net truncated non-mergeable packet: " "i %zd mergeable %d offset %zd, size %zd, " "guest hdr len %zd, host hdr len %zd", i, n->mergeable_rx_bufs, offset, size, n->guest_hdr_len, n->host_hdr_len); #endif return size; } /* signal other side */ virtqueue_fill(n->rx_vq, &elem, total, i++); } if (mhdr_cnt) { stw_p(&mhdr.num_buffers, i); iov_from_buf(mhdr_sg, mhdr_cnt, 0, &mhdr.num_buffers, sizeof mhdr.num_buffers); } virtqueue_flush(n->rx_vq, i); virtio_notify(&n->vdev, n->rx_vq); return size; } static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq); static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) { VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; virtqueue_push(n->tx_vq, &n->async_tx.elem, 0); virtio_notify(&n->vdev, n->tx_vq); n->async_tx.elem.out_num = n->async_tx.len = 0; virtio_queue_set_notification(n->tx_vq, 1); virtio_net_flush_tx(n, n->tx_vq); } /* TX */ static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq) { VirtQueueElement elem; int32_t num_packets = 0; if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) { return num_packets; } assert(n->vdev.vm_running); if (n->async_tx.elem.out_num) { virtio_queue_set_notification(n->tx_vq, 0); return num_packets; } while (virtqueue_pop(vq, &elem)) { ssize_t ret, len; unsigned int out_num = elem.out_num; struct iovec *out_sg = &elem.out_sg[0]; struct iovec sg[VIRTQUEUE_MAX_SIZE]; if (out_num < 1) { error_report("virtio-net header not in first element"); exit(1); } /* * If host wants to see the guest header as is, we can * pass it on unchanged. Otherwise, copy just the parts * that host is interested in. */ assert(n->host_hdr_len <= n->guest_hdr_len); if (n->host_hdr_len != n->guest_hdr_len) { unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), out_sg, out_num, 0, n->host_hdr_len); sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, out_sg, out_num, n->guest_hdr_len, -1); out_num = sg_num; out_sg = sg; } len = n->guest_hdr_len; ret = qemu_sendv_packet_async(&n->nic->nc, out_sg, out_num, virtio_net_tx_complete); if (ret == 0) { virtio_queue_set_notification(n->tx_vq, 0); n->async_tx.elem = elem; n->async_tx.len = len; return -EBUSY; } len += ret; virtqueue_push(vq, &elem, 0); virtio_notify(&n->vdev, vq); if (++num_packets >= n->tx_burst) { break; } } return num_packets; } static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) { VirtIONet *n = to_virtio_net(vdev); /* This happens when device was stopped but VCPU wasn't. */ if (!n->vdev.vm_running) { n->tx_waiting = 1; return; } if (n->tx_waiting) { virtio_queue_set_notification(vq, 1); qemu_del_timer(n->tx_timer); n->tx_waiting = 0; virtio_net_flush_tx(n, vq); } else { qemu_mod_timer(n->tx_timer, qemu_get_clock_ns(vm_clock) + n->tx_timeout); n->tx_waiting = 1; virtio_queue_set_notification(vq, 0); } } static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) { VirtIONet *n = to_virtio_net(vdev); if (unlikely(n->tx_waiting)) { return; } n->tx_waiting = 1; /* This happens when device was stopped but VCPU wasn't. */ if (!n->vdev.vm_running) { return; } virtio_queue_set_notification(vq, 0); qemu_bh_schedule(n->tx_bh); } static void virtio_net_tx_timer(void *opaque) { VirtIONet *n = opaque; assert(n->vdev.vm_running); n->tx_waiting = 0; /* Just in case the driver is not ready on more */ if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) return; virtio_queue_set_notification(n->tx_vq, 1); virtio_net_flush_tx(n, n->tx_vq); } static void virtio_net_tx_bh(void *opaque) { VirtIONet *n = opaque; int32_t ret; assert(n->vdev.vm_running); n->tx_waiting = 0; /* Just in case the driver is not ready on more */ if (unlikely(!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))) return; ret = virtio_net_flush_tx(n, n->tx_vq); if (ret == -EBUSY) { return; /* Notification re-enable handled by tx_complete */ } /* If we flush a full burst of packets, assume there are * more coming and immediately reschedule */ if (ret >= n->tx_burst) { qemu_bh_schedule(n->tx_bh); n->tx_waiting = 1; return; } /* If less than a full burst, re-enable notification and flush * anything that may have come in while we weren't looking. If * we find something, assume the guest is still active and reschedule */ virtio_queue_set_notification(n->tx_vq, 1); if (virtio_net_flush_tx(n, n->tx_vq) > 0) { virtio_queue_set_notification(n->tx_vq, 0); qemu_bh_schedule(n->tx_bh); n->tx_waiting = 1; } } static void virtio_net_save(QEMUFile *f, void *opaque) { VirtIONet *n = opaque; /* At this point, backend must be stopped, otherwise * it might keep writing to memory. */ assert(!n->vhost_started); virtio_save(&n->vdev, f); qemu_put_buffer(f, n->mac, ETH_ALEN); qemu_put_be32(f, n->tx_waiting); qemu_put_be32(f, n->mergeable_rx_bufs); qemu_put_be16(f, n->status); qemu_put_byte(f, n->promisc); qemu_put_byte(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); qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); qemu_put_be32(f, n->has_vnet_hdr); qemu_put_byte(f, n->mac_table.multi_overflow); qemu_put_byte(f, n->mac_table.uni_overflow); qemu_put_byte(f, n->alluni); qemu_put_byte(f, n->nomulti); qemu_put_byte(f, n->nouni); qemu_put_byte(f, n->nobcast); qemu_put_byte(f, n->has_ufo); } static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) { VirtIONet *n = opaque; int i; int ret; if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) return -EINVAL; ret = virtio_load(&n->vdev, f); if (ret) { return ret; } qemu_get_buffer(f, n->mac, ETH_ALEN); n->tx_waiting = qemu_get_be32(f); virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f)); if (version_id >= 3) n->status = qemu_get_be16(f); if (version_id >= 4) { if (version_id < 8) { n->promisc = qemu_get_be32(f); n->allmulti = qemu_get_be32(f); } else { n->promisc = qemu_get_byte(f); n->allmulti = qemu_get_byte(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) { uint8_t *buf = g_malloc0(n->mac_table.in_use); qemu_get_buffer(f, buf, n->mac_table.in_use * ETH_ALEN); g_free(buf); n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1; n->mac_table.in_use = 0; } } if (version_id >= 6) qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); if (version_id >= 7) { if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) { error_report("virtio-net: saved image requires vnet_hdr=on"); return -1; } if (n->has_vnet_hdr) { tap_set_offload(n->nic->nc.peer, (n->vdev.guest_features >> VIRTIO_NET_F_GUEST_CSUM) & 1, (n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO4) & 1, (n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO6) & 1, (n->vdev.guest_features >> VIRTIO_NET_F_GUEST_ECN) & 1, (n->vdev.guest_features >> VIRTIO_NET_F_GUEST_UFO) & 1); } } if (version_id >= 9) { n->mac_table.multi_overflow = qemu_get_byte(f); n->mac_table.uni_overflow = qemu_get_byte(f); } if (version_id >= 10) { n->alluni = qemu_get_byte(f); n->nomulti = qemu_get_byte(f); n->nouni = qemu_get_byte(f); n->nobcast = qemu_get_byte(f); } if (version_id >= 11) { if (qemu_get_byte(f) && !peer_has_ufo(n)) { error_report("virtio-net: saved image requires TUN_F_UFO support"); return -1; } } /* Find the first multicast entry in the saved MAC filter */ for (i = 0; i < n->mac_table.in_use; i++) { if (n->mac_table.macs[i * ETH_ALEN] & 1) { break; } } n->mac_table.first_multi = i; /* nc.link_down can't be migrated, so infer link_down according * to link status bit in n->status */ n->nic->nc.link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; return 0; } static void virtio_net_cleanup(NetClientState *nc) { VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; n->nic = NULL; } static NetClientInfo net_virtio_info = { .type = NET_CLIENT_OPTIONS_KIND_NIC, .size = sizeof(NICState), .can_receive = virtio_net_can_receive, .receive = virtio_net_receive, .cleanup = virtio_net_cleanup, .link_status_changed = virtio_net_set_link_status, }; VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf, virtio_net_conf *net) { VirtIONet *n; n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET, sizeof(struct virtio_net_config), sizeof(VirtIONet)); n->vdev.get_config = virtio_net_get_config; n->vdev.set_config = virtio_net_set_config; n->vdev.get_features = virtio_net_get_features; n->vdev.set_features = virtio_net_set_features; n->vdev.bad_features = virtio_net_bad_features; n->vdev.reset = virtio_net_reset; n->vdev.set_status = virtio_net_set_status; n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx); if (net->tx && strcmp(net->tx, "timer") && strcmp(net->tx, "bh")) { error_report("virtio-net: " "Unknown option tx=%s, valid options: \"timer\" \"bh\"", net->tx); error_report("Defaulting to \"bh\""); } if (net->tx && !strcmp(net->tx, "timer")) { n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx_timer); n->tx_timer = qemu_new_timer_ns(vm_clock, virtio_net_tx_timer, n); n->tx_timeout = net->txtimer; } else { n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx_bh); n->tx_bh = qemu_bh_new(virtio_net_tx_bh, n); } n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl); qemu_macaddr_default_if_unset(&conf->macaddr); memcpy(&n->mac[0], &conf->macaddr, sizeof(n->mac)); n->status = VIRTIO_NET_S_LINK_UP; n->nic = qemu_new_nic(&net_virtio_info, conf, object_get_typename(OBJECT(dev)), dev->id, n); peer_test_vnet_hdr(n); if (peer_has_vnet_hdr(n)) { tap_using_vnet_hdr(n->nic->nc.peer, 1); n->host_hdr_len = sizeof(struct virtio_net_hdr); } else { n->host_hdr_len = 0; } qemu_format_nic_info_str(&n->nic->nc, conf->macaddr.a); n->tx_waiting = 0; n->tx_burst = net->txburst; virtio_net_set_mrg_rx_bufs(n, 0); n->promisc = 1; /* for compatibility */ n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); n->vlans = g_malloc0(MAX_VLAN >> 3); n->qdev = dev; register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, virtio_net_save, virtio_net_load, n); add_boot_device_path(conf->bootindex, dev, "/ethernet-phy@0"); return &n->vdev; } void virtio_net_exit(VirtIODevice *vdev) { VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev); /* This will stop vhost backend if appropriate. */ virtio_net_set_status(vdev, 0); qemu_purge_queued_packets(&n->nic->nc); unregister_savevm(n->qdev, "virtio-net", n); g_free(n->mac_table.macs); g_free(n->vlans); if (n->tx_timer) { qemu_del_timer(n->tx_timer); qemu_free_timer(n->tx_timer); } else { qemu_bh_delete(n->tx_bh); } qemu_del_net_client(&n->nic->nc); virtio_cleanup(&n->vdev); }