diff options
Diffstat (limited to 'hw/virtio-net.c')
| -rw-r--r-- | hw/virtio-net.c | 1370 |
1 files changed, 0 insertions, 1370 deletions
diff --git a/hw/virtio-net.c b/hw/virtio-net.c deleted file mode 100644 index 5917740d9d..0000000000 --- a/hw/virtio-net.c +++ /dev/null @@ -1,1370 +0,0 @@ -/* - * 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.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-net.h" -#include "hw/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); -} |