diff options
Diffstat (limited to 'hw/net/virtio-net.c')
| -rw-r--r-- | hw/net/virtio-net.c | 1370 |
1 files changed, 1370 insertions, 0 deletions
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c new file mode 100644 index 0000000..bc8fd43 --- /dev/null +++ b/hw/net/virtio-net.c @@ -0,0 +1,1370 @@ +/* + * 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 "hw/virtio/virtio.h" +#include "net/net.h" +#include "net/checksum.h" +#include "net/tap.h" +#include "qemu/error-report.h" +#include "qemu/timer.h" +#include "hw/virtio/virtio-net.h" +#include "net/vhost_net.h" + +#define VIRTIO_NET_VM_VERSION 11 + +#define MAC_TABLE_ENTRIES 64 +#define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ + +/* + * Calculate the number of bytes up to and including the given 'field' of + * 'container'. + */ +#define endof(container, field) \ + (offsetof(container, field) + sizeof(((container *)0)->field)) + +typedef struct VirtIOFeature { + uint32_t flags; + size_t end; +} VirtIOFeature; + +static VirtIOFeature feature_sizes[] = { + {.flags = 1 << VIRTIO_NET_F_MAC, + .end = endof(struct virtio_net_config, mac)}, + {.flags = 1 << VIRTIO_NET_F_STATUS, + .end = endof(struct virtio_net_config, status)}, + {.flags = 1 << VIRTIO_NET_F_MQ, + .end = endof(struct virtio_net_config, max_virtqueue_pairs)}, + {} +}; + +static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc) +{ + VirtIONet *n = qemu_get_nic_opaque(nc); + + return &n->vqs[nc->queue_index]; +} + +static int vq2q(int queue_index) +{ + return queue_index / 2; +} + +/* 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); + stw_p(&netcfg.max_virtqueue_pairs, n->max_queues); + memcpy(netcfg.mac, n->mac, ETH_ALEN); + memcpy(config, &netcfg, n->config_size); +} + +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, n->config_size); + + if (!(n->vdev.guest_features >> VIRTIO_NET_F_CTRL_MAC_ADDR & 1) && + memcmp(netcfg.mac, n->mac, ETH_ALEN)) { + memcpy(n->mac, netcfg.mac, ETH_ALEN); + qemu_format_nic_info_str(qemu_get_queue(n->nic), 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) +{ + NetClientState *nc = qemu_get_queue(n->nic); + int queues = n->multiqueue ? n->max_queues : 1; + + if (!nc->peer) { + return; + } + if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { + return; + } + + if (!tap_get_vhost_net(nc->peer)) { + return; + } + + if (!!n->vhost_started == virtio_net_started(n, status) && + !nc->peer->link_down) { + return; + } + if (!n->vhost_started) { + int r; + if (!vhost_net_query(tap_get_vhost_net(nc->peer), &n->vdev)) { + return; + } + n->vhost_started = 1; + r = vhost_net_start(&n->vdev, n->nic->ncs, queues); + if (r < 0) { + error_report("unable to start vhost net: %d: " + "falling back on userspace virtio", -r); + n->vhost_started = 0; + } + } else { + vhost_net_stop(&n->vdev, n->nic->ncs, queues); + n->vhost_started = 0; + } +} + +static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) +{ + VirtIONet *n = to_virtio_net(vdev); + VirtIONetQueue *q; + int i; + uint8_t queue_status; + + virtio_net_vhost_status(n, status); + + for (i = 0; i < n->max_queues; i++) { + q = &n->vqs[i]; + + if ((!n->multiqueue && i != 0) || i >= n->curr_queues) { + queue_status = 0; + } else { + queue_status = status; + } + + if (!q->tx_waiting) { + continue; + } + + if (virtio_net_started(n, queue_status) && !n->vhost_started) { + if (q->tx_timer) { + qemu_mod_timer(q->tx_timer, + qemu_get_clock_ns(vm_clock) + n->tx_timeout); + } else { + qemu_bh_schedule(q->tx_bh); + } + } else { + if (q->tx_timer) { + qemu_del_timer(q->tx_timer); + } else { + qemu_bh_cancel(q->tx_bh); + } + } + } +} + +static void virtio_net_set_link_status(NetClientState *nc) +{ + VirtIONet *n = qemu_get_nic_opaque(nc); + 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; + /* multiqueue is disabled by default */ + n->curr_queues = 1; + + /* 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); + memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); + memset(n->vlans, 0, MAX_VLAN >> 3); +} + +static void peer_test_vnet_hdr(VirtIONet *n) +{ + NetClientState *nc = qemu_get_queue(n->nic); + if (!nc->peer) { + return; + } + + if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { + return; + } + + n->has_vnet_hdr = tap_has_vnet_hdr(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(qemu_get_queue(n->nic)->peer); + + return n->has_ufo; +} + +static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs) +{ + int i; + NetClientState *nc; + + 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); + + for (i = 0; i < n->max_queues; i++) { + nc = qemu_get_subqueue(n->nic, i); + + if (peer_has_vnet_hdr(n) && + tap_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) { + tap_set_vnet_hdr_len(nc->peer, n->guest_hdr_len); + n->host_hdr_len = n->guest_hdr_len; + } + } +} + +static int peer_attach(VirtIONet *n, int index) +{ + NetClientState *nc = qemu_get_subqueue(n->nic, index); + + if (!nc->peer) { + return 0; + } + + if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { + return 0; + } + + return tap_enable(nc->peer); +} + +static int peer_detach(VirtIONet *n, int index) +{ + NetClientState *nc = qemu_get_subqueue(n->nic, index); + + if (!nc->peer) { + return 0; + } + + if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { + return 0; + } + + return tap_disable(nc->peer); +} + +static void virtio_net_set_queues(VirtIONet *n) +{ + int i; + + for (i = 0; i < n->max_queues; i++) { + if (i < n->curr_queues) { + assert(!peer_attach(n, i)); + } else { + assert(!peer_detach(n, i)); + } + } +} + +static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue, int ctrl); + +static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features) +{ + VirtIONet *n = to_virtio_net(vdev); + NetClientState *nc = qemu_get_queue(n->nic); + + 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 (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { + return features; + } + if (!tap_get_vhost_net(nc->peer)) { + return features; + } + return vhost_net_get_features(tap_get_vhost_net(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); + int i; + + virtio_net_set_multiqueue(n, !!(features & (1 << VIRTIO_NET_F_MQ)), + !!(features & (1 << VIRTIO_NET_F_CTRL_VQ))); + + virtio_net_set_mrg_rx_bufs(n, !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF))); + + if (n->has_vnet_hdr) { + tap_set_offload(qemu_get_subqueue(n->nic, 0)->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); + } + + for (i = 0; i < n->max_queues; i++) { + NetClientState *nc = qemu_get_subqueue(n->nic, i); + + if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { + continue; + } + if (!tap_get_vhost_net(nc->peer)) { + continue; + } + vhost_net_ack_features(tap_get_vhost_net(nc->peer), features); + } +} + +static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, + struct iovec *iov, unsigned int iov_cnt) +{ + uint8_t on; + size_t s; + + s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); + if (s != sizeof(on)) { + return VIRTIO_NET_ERR; + } + + if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { + n->promisc = on; + } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { + n->allmulti = on; + } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { + n->alluni = on; + } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { + n->nomulti = on; + } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { + n->nouni = on; + } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { + n->nobcast = on; + } else { + return VIRTIO_NET_ERR; + } + + return VIRTIO_NET_OK; +} + +static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, + struct iovec *iov, unsigned int iov_cnt) +{ + struct virtio_net_ctrl_mac mac_data; + size_t s; + + if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { + if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { + return VIRTIO_NET_ERR; + } + s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); + assert(s == sizeof(n->mac)); + qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); + return VIRTIO_NET_OK; + } + + if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { + 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); + + s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, + sizeof(mac_data.entries)); + mac_data.entries = ldl_p(&mac_data.entries); + if (s != sizeof(mac_data.entries)) { + return VIRTIO_NET_ERR; + } + iov_discard_front(&iov, &iov_cnt, s); + + if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { + return VIRTIO_NET_ERR; + } + + if (mac_data.entries <= MAC_TABLE_ENTRIES) { + s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs, + mac_data.entries * ETH_ALEN); + if (s != mac_data.entries * ETH_ALEN) { + return VIRTIO_NET_ERR; + } + n->mac_table.in_use += mac_data.entries; + } else { + n->mac_table.uni_overflow = 1; + } + + iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); + + n->mac_table.first_multi = n->mac_table.in_use; + + s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, + sizeof(mac_data.entries)); + mac_data.entries = ldl_p(&mac_data.entries); + if (s != sizeof(mac_data.entries)) { + return VIRTIO_NET_ERR; + } + + iov_discard_front(&iov, &iov_cnt, s); + + if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { + return VIRTIO_NET_ERR; + } + + if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) { + s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs, + mac_data.entries * ETH_ALEN); + if (s != mac_data.entries * ETH_ALEN) { + return VIRTIO_NET_ERR; + } + 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, + struct iovec *iov, unsigned int iov_cnt) +{ + uint16_t vid; + size_t s; + + s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); + vid = lduw_p(&vid); + if (s != sizeof(vid)) { + return VIRTIO_NET_ERR; + } + + 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 int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, + struct iovec *iov, unsigned int iov_cnt) +{ + struct virtio_net_ctrl_mq mq; + size_t s; + uint16_t queues; + + s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); + if (s != sizeof(mq)) { + return VIRTIO_NET_ERR; + } + + if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { + return VIRTIO_NET_ERR; + } + + queues = lduw_p(&mq.virtqueue_pairs); + + if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || + queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || + queues > n->max_queues || + !n->multiqueue) { + return VIRTIO_NET_ERR; + } + + n->curr_queues = queues; + /* stop the backend before changing the number of queues to avoid handling a + * disabled queue */ + virtio_net_set_status(&n->vdev, n->vdev.status); + virtio_net_set_queues(n); + + 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; + size_t s; + struct iovec *iov; + unsigned int iov_cnt; + + while (virtqueue_pop(vq, &elem)) { + if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) || + iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) { + error_report("virtio-net ctrl missing headers"); + exit(1); + } + + iov = elem.out_sg; + iov_cnt = elem.out_num; + s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); + iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); + if (s != sizeof(ctrl)) { + status = VIRTIO_NET_ERR; + } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { + status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); + } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { + status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); + } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { + status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); + } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { + status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); + } + + s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status)); + assert(s == sizeof(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); + int queue_index = vq2q(virtio_get_queue_index(vq)); + + qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); +} + +static int virtio_net_can_receive(NetClientState *nc) +{ + VirtIONet *n = qemu_get_nic_opaque(nc); + VirtIONetQueue *q = virtio_net_get_subqueue(nc); + + if (!n->vdev.vm_running) { + return 0; + } + + if (nc->queue_index >= n->curr_queues) { + return 0; + } + + if (!virtio_queue_ready(q->rx_vq) || + !(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) { + return 0; + } + + return 1; +} + +static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) +{ + VirtIONet *n = q->n; + if (virtio_queue_empty(q->rx_vq) || + (n->mergeable_rx_bufs && + !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { + virtio_queue_set_notification(q->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(q->rx_vq) || + (n->mergeable_rx_bufs && + !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { + return 0; + } + } + + virtio_queue_set_notification(q->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 = qemu_get_nic_opaque(nc); + VirtIONetQueue *q = virtio_net_get_subqueue(nc); + 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(nc)) { + return -1; + } + + /* hdr_len refers to the header we supply to the guest */ + if (!virtio_net_has_buffers(q, 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(q->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(q->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(q->rx_vq, i); + virtio_notify(&n->vdev, q->rx_vq); + + return size; +} + +static int32_t virtio_net_flush_tx(VirtIONetQueue *q); + +static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) +{ + VirtIONet *n = qemu_get_nic_opaque(nc); + VirtIONetQueue *q = virtio_net_get_subqueue(nc); + + virtqueue_push(q->tx_vq, &q->async_tx.elem, 0); + virtio_notify(&n->vdev, q->tx_vq); + + q->async_tx.elem.out_num = q->async_tx.len = 0; + + virtio_queue_set_notification(q->tx_vq, 1); + virtio_net_flush_tx(q); +} + +/* TX */ +static int32_t virtio_net_flush_tx(VirtIONetQueue *q) +{ + VirtIONet *n = q->n; + VirtQueueElement elem; + int32_t num_packets = 0; + int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); + if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) { + return num_packets; + } + + assert(n->vdev.vm_running); + + if (q->async_tx.elem.out_num) { + virtio_queue_set_notification(q->tx_vq, 0); + return num_packets; + } + + while (virtqueue_pop(q->tx_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(qemu_get_subqueue(n->nic, queue_index), + out_sg, out_num, virtio_net_tx_complete); + if (ret == 0) { + virtio_queue_set_notification(q->tx_vq, 0); + q->async_tx.elem = elem; + q->async_tx.len = len; + return -EBUSY; + } + + len += ret; + + virtqueue_push(q->tx_vq, &elem, 0); + virtio_notify(&n->vdev, q->tx_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); + VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; + + /* This happens when device was stopped but VCPU wasn't. */ + if (!n->vdev.vm_running) { + q->tx_waiting = 1; + return; + } + + if (q->tx_waiting) { + virtio_queue_set_notification(vq, 1); + qemu_del_timer(q->tx_timer); + q->tx_waiting = 0; + virtio_net_flush_tx(q); + } else { + qemu_mod_timer(q->tx_timer, + qemu_get_clock_ns(vm_clock) + n->tx_timeout); + q->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); + VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; + + if (unlikely(q->tx_waiting)) { + return; + } + q->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(q->tx_bh); +} + +static void virtio_net_tx_timer(void *opaque) +{ + VirtIONetQueue *q = opaque; + VirtIONet *n = q->n; + assert(n->vdev.vm_running); + + q->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(q->tx_vq, 1); + virtio_net_flush_tx(q); +} + +static void virtio_net_tx_bh(void *opaque) +{ + VirtIONetQueue *q = opaque; + VirtIONet *n = q->n; + int32_t ret; + + assert(n->vdev.vm_running); + + q->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(q); + 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(q->tx_bh); + q->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(q->tx_vq, 1); + if (virtio_net_flush_tx(q) > 0) { + virtio_queue_set_notification(q->tx_vq, 0); + qemu_bh_schedule(q->tx_bh); + q->tx_waiting = 1; + } +} + +static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue, int ctrl) +{ + VirtIODevice *vdev = &n->vdev; + int i, max = multiqueue ? n->max_queues : 1; + + n->multiqueue = multiqueue; + + for (i = 2; i <= n->max_queues * 2 + 1; i++) { + virtio_del_queue(vdev, i); + } + + for (i = 1; i < max; i++) { + n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); + if (n->vqs[i].tx_timer) { + n->vqs[i].tx_vq = + virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer); + n->vqs[i].tx_timer = qemu_new_timer_ns(vm_clock, + virtio_net_tx_timer, + &n->vqs[i]); + } else { + n->vqs[i].tx_vq = + virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh); + n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]); + } + + n->vqs[i].tx_waiting = 0; + n->vqs[i].n = n; + } + + if (ctrl) { + n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); + } + + virtio_net_set_queues(n); +} + +static void virtio_net_save(QEMUFile *f, void *opaque) +{ + int i; + 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->vqs[0].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); + if (n->max_queues > 1) { + qemu_put_be16(f, n->max_queues); + qemu_put_be16(f, n->curr_queues); + for (i = 1; i < n->curr_queues; i++) { + qemu_put_be32(f, n->vqs[i].tx_waiting); + } + } +} + +static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) +{ + VirtIONet *n = opaque; + int ret, i, link_down; + + 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->vqs[0].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(qemu_get_queue(n->nic)->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; + } + } + + if (n->max_queues > 1) { + if (n->max_queues != qemu_get_be16(f)) { + error_report("virtio-net: different max_queues "); + return -1; + } + + n->curr_queues = qemu_get_be16(f); + for (i = 1; i < n->curr_queues; i++) { + n->vqs[i].tx_waiting = qemu_get_be32(f); + } + } + + virtio_net_set_queues(n); + + /* 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 */ + link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; + for (i = 0; i < n->max_queues; i++) { + qemu_get_subqueue(n->nic, i)->link_down = link_down; + } + + return 0; +} + +static void virtio_net_cleanup(NetClientState *nc) +{ + VirtIONet *n = qemu_get_nic_opaque(nc); + + 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, +}; + +static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) +{ + VirtIONet *n = to_virtio_net(vdev); + NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); + assert(n->vhost_started); + return vhost_net_virtqueue_pending(tap_get_vhost_net(nc->peer), idx); +} + +static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, + bool mask) +{ + VirtIONet *n = to_virtio_net(vdev); + NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); + assert(n->vhost_started); + vhost_net_virtqueue_mask(tap_get_vhost_net(nc->peer), + vdev, idx, mask); +} + +VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf, + virtio_net_conf *net, uint32_t host_features) +{ + VirtIONet *n; + int i, config_size = 0; + + for (i = 0; feature_sizes[i].flags != 0; i++) { + if (host_features & feature_sizes[i].flags) { + config_size = MAX(feature_sizes[i].end, config_size); + } + } + + n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET, + config_size, sizeof(VirtIONet)); + + n->config_size = config_size; + 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->vdev.guest_notifier_mask = virtio_net_guest_notifier_mask; + n->vdev.guest_notifier_pending = virtio_net_guest_notifier_pending; + n->max_queues = MAX(conf->queues, 1); + n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); + n->vqs[0].rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx); + n->curr_queues = 1; + n->vqs[0].n = n; + n->tx_timeout = net->txtimer; + + 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->vqs[0].tx_vq = virtio_add_queue(&n->vdev, 256, + virtio_net_handle_tx_timer); + n->vqs[0].tx_timer = qemu_new_timer_ns(vm_clock, virtio_net_tx_timer, + &n->vqs[0]); + } else { + n->vqs[0].tx_vq = virtio_add_queue(&n->vdev, 256, + virtio_net_handle_tx_bh); + n->vqs[0].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[0]); + } + 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)) { + for (i = 0; i < n->max_queues; i++) { + tap_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true); + } + n->host_hdr_len = sizeof(struct virtio_net_hdr); + } else { + n->host_hdr_len = 0; + } + + qemu_format_nic_info_str(qemu_get_queue(n->nic), conf->macaddr.a); + + n->vqs[0].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); + int i; + + /* This will stop vhost backend if appropriate. */ + virtio_net_set_status(vdev, 0); + + unregister_savevm(n->qdev, "virtio-net", n); + + g_free(n->mac_table.macs); + g_free(n->vlans); + + for (i = 0; i < n->max_queues; i++) { + VirtIONetQueue *q = &n->vqs[i]; + NetClientState *nc = qemu_get_subqueue(n->nic, i); + + qemu_purge_queued_packets(nc); + + if (q->tx_timer) { + qemu_del_timer(q->tx_timer); + qemu_free_timer(q->tx_timer); + } else { + qemu_bh_delete(q->tx_bh); + } + } + + g_free(n->vqs); + qemu_del_nic(n->nic); + virtio_cleanup(&n->vdev); +} |