2 * Virtio Network Device
4 * Copyright IBM, Corp. 2007
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
16 #include "qemu-timer.h"
17 #include "virtio-net.h"
19 #define VIRTIO_NET_VM_VERSION 4
21 typedef struct VirtIONet
24 uint8_t mac[ETH_ALEN];
32 int mergeable_rx_bufs;
38 * - we could suppress RX interrupt if we were so inclined.
41 static VirtIONet *to_virtio_net(VirtIODevice *vdev)
43 return (VirtIONet *)vdev;
46 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
48 VirtIONet *n = to_virtio_net(vdev);
49 struct virtio_net_config netcfg;
51 netcfg.status = n->status;
52 memcpy(netcfg.mac, n->mac, ETH_ALEN);
53 memcpy(config, &netcfg, sizeof(netcfg));
56 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
58 VirtIONet *n = to_virtio_net(vdev);
59 struct virtio_net_config netcfg;
61 memcpy(&netcfg, config, sizeof(netcfg));
63 if (memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
64 memcpy(n->mac, netcfg.mac, ETH_ALEN);
65 qemu_format_nic_info_str(n->vc, n->mac);
69 static void virtio_net_set_link_status(VLANClientState *vc)
71 VirtIONet *n = vc->opaque;
72 uint16_t old_status = n->status;
75 n->status &= ~VIRTIO_NET_S_LINK_UP;
77 n->status |= VIRTIO_NET_S_LINK_UP;
79 if (n->status != old_status)
80 virtio_notify_config(&n->vdev);
83 static void virtio_net_reset(VirtIODevice *vdev)
85 VirtIONet *n = to_virtio_net(vdev);
87 /* Reset back to compatibility mode */
92 static uint32_t virtio_net_get_features(VirtIODevice *vdev)
94 uint32_t features = (1 << VIRTIO_NET_F_MAC) |
95 (1 << VIRTIO_NET_F_STATUS) |
96 (1 << VIRTIO_NET_F_CTRL_VQ);
101 static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
103 VirtIONet *n = to_virtio_net(vdev);
105 n->mergeable_rx_bufs = !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF));
108 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
109 VirtQueueElement *elem)
113 if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(on)) {
114 fprintf(stderr, "virtio-net ctrl invalid rx mode command\n");
118 on = ldub_p(elem->out_sg[1].iov_base);
120 if (cmd == VIRTIO_NET_CTRL_RX_MODE_PROMISC)
122 else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLMULTI)
125 return VIRTIO_NET_ERR;
127 return VIRTIO_NET_OK;
130 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
132 VirtIONet *n = to_virtio_net(vdev);
133 struct virtio_net_ctrl_hdr ctrl;
134 virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
135 VirtQueueElement elem;
137 while (virtqueue_pop(vq, &elem)) {
138 if ((elem.in_num < 1) || (elem.out_num < 1)) {
139 fprintf(stderr, "virtio-net ctrl missing headers\n");
143 if (elem.out_sg[0].iov_len < sizeof(ctrl) ||
144 elem.out_sg[elem.in_num - 1].iov_len < sizeof(status)) {
145 fprintf(stderr, "virtio-net ctrl header not in correct element\n");
149 ctrl.class = ldub_p(elem.out_sg[0].iov_base);
150 ctrl.cmd = ldub_p(elem.out_sg[0].iov_base + sizeof(ctrl.class));
152 if (ctrl.class == VIRTIO_NET_CTRL_RX_MODE)
153 status = virtio_net_handle_rx_mode(n, ctrl.cmd, &elem);
155 stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);
157 virtqueue_push(vq, &elem, sizeof(status));
158 virtio_notify(vdev, vq);
164 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
168 static int do_virtio_net_can_receive(VirtIONet *n, int bufsize)
170 if (!virtio_queue_ready(n->rx_vq) ||
171 !(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
174 if (virtio_queue_empty(n->rx_vq) ||
175 (n->mergeable_rx_bufs &&
176 !virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
177 virtio_queue_set_notification(n->rx_vq, 1);
181 virtio_queue_set_notification(n->rx_vq, 0);
185 static int virtio_net_can_receive(void *opaque)
187 VirtIONet *n = opaque;
189 return do_virtio_net_can_receive(n, VIRTIO_NET_MAX_BUFSIZE);
192 static int iov_fill(struct iovec *iov, int iovcnt, const void *buf, int count)
197 while (offset < count && i < iovcnt) {
198 int len = MIN(iov[i].iov_len, count - offset);
199 memcpy(iov[i].iov_base, buf + offset, len);
207 static int receive_header(VirtIONet *n, struct iovec *iov, int iovcnt,
208 const void *buf, size_t size, size_t hdr_len)
210 struct virtio_net_hdr *hdr = iov[0].iov_base;
214 hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
216 /* We only ever receive a struct virtio_net_hdr from the tapfd,
217 * but we may be passing along a larger header to the guest.
219 iov[0].iov_base += hdr_len;
220 iov[0].iov_len -= hdr_len;
225 static void virtio_net_receive(void *opaque, const uint8_t *buf, int size)
227 VirtIONet *n = opaque;
228 struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL;
229 size_t hdr_len, offset, i;
231 if (!do_virtio_net_can_receive(n, size))
234 /* hdr_len refers to the header we supply to the guest */
235 hdr_len = n->mergeable_rx_bufs ?
236 sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);
240 while (offset < size) {
241 VirtQueueElement elem;
243 struct iovec sg[VIRTQUEUE_MAX_SIZE];
247 if ((i != 0 && !n->mergeable_rx_bufs) ||
248 virtqueue_pop(n->rx_vq, &elem) == 0) {
251 fprintf(stderr, "virtio-net truncating packet\n");
255 if (elem.in_num < 1) {
256 fprintf(stderr, "virtio-net receive queue contains no in buffers\n");
260 if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != hdr_len) {
261 fprintf(stderr, "virtio-net header not in first element\n");
265 memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num);
268 if (n->mergeable_rx_bufs)
269 mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base;
271 offset += receive_header(n, sg, elem.in_num,
272 buf + offset, size - offset, hdr_len);
276 /* copy in packet. ugh */
277 len = iov_fill(sg, elem.in_num,
278 buf + offset, size - offset);
281 /* signal other side */
282 virtqueue_fill(n->rx_vq, &elem, total, i++);
288 mhdr->num_buffers = i;
290 virtqueue_flush(n->rx_vq, i);
291 virtio_notify(&n->vdev, n->rx_vq);
295 static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
297 VirtQueueElement elem;
298 int has_vnet_hdr = 0;
300 if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
303 while (virtqueue_pop(vq, &elem)) {
305 unsigned int out_num = elem.out_num;
306 struct iovec *out_sg = &elem.out_sg[0];
309 /* hdr_len refers to the header received from the guest */
310 hdr_len = n->mergeable_rx_bufs ?
311 sizeof(struct virtio_net_hdr_mrg_rxbuf) :
312 sizeof(struct virtio_net_hdr);
314 if (out_num < 1 || out_sg->iov_len != hdr_len) {
315 fprintf(stderr, "virtio-net header not in first element\n");
319 /* ignore the header if GSO is not supported */
324 } else if (n->mergeable_rx_bufs) {
325 /* tapfd expects a struct virtio_net_hdr */
326 hdr_len -= sizeof(struct virtio_net_hdr);
327 out_sg->iov_len -= hdr_len;
331 len += qemu_sendv_packet(n->vc, out_sg, out_num);
333 virtqueue_push(vq, &elem, len);
334 virtio_notify(&n->vdev, vq);
338 static void virtio_net_handle_tx(VirtIODevice *vdev, VirtQueue *vq)
340 VirtIONet *n = to_virtio_net(vdev);
342 if (n->tx_timer_active) {
343 virtio_queue_set_notification(vq, 1);
344 qemu_del_timer(n->tx_timer);
345 n->tx_timer_active = 0;
346 virtio_net_flush_tx(n, vq);
348 qemu_mod_timer(n->tx_timer,
349 qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
350 n->tx_timer_active = 1;
351 virtio_queue_set_notification(vq, 0);
355 static void virtio_net_tx_timer(void *opaque)
357 VirtIONet *n = opaque;
359 n->tx_timer_active = 0;
361 /* Just in case the driver is not ready on more */
362 if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
365 virtio_queue_set_notification(n->tx_vq, 1);
366 virtio_net_flush_tx(n, n->tx_vq);
369 static void virtio_net_save(QEMUFile *f, void *opaque)
371 VirtIONet *n = opaque;
373 virtio_save(&n->vdev, f);
375 qemu_put_buffer(f, n->mac, ETH_ALEN);
376 qemu_put_be32(f, n->tx_timer_active);
377 qemu_put_be32(f, n->mergeable_rx_bufs);
378 qemu_put_be16(f, n->status);
379 qemu_put_be32(f, n->promisc);
380 qemu_put_be32(f, n->allmulti);
383 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
385 VirtIONet *n = opaque;
387 if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
390 virtio_load(&n->vdev, f);
392 qemu_get_buffer(f, n->mac, ETH_ALEN);
393 n->tx_timer_active = qemu_get_be32(f);
394 n->mergeable_rx_bufs = qemu_get_be32(f);
397 n->status = qemu_get_be16(f);
399 if (version_id >= 4) {
400 n->promisc = qemu_get_be32(f);
401 n->allmulti = qemu_get_be32(f);
404 if (n->tx_timer_active) {
405 qemu_mod_timer(n->tx_timer,
406 qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
412 void virtio_net_init(PCIBus *bus, NICInfo *nd, int devfn)
415 static int virtio_net_id;
417 n = (VirtIONet *)virtio_init_pci(bus, "virtio-net",
418 PCI_VENDOR_ID_REDHAT_QUMRANET,
419 PCI_DEVICE_ID_VIRTIO_NET,
420 PCI_VENDOR_ID_REDHAT_QUMRANET,
422 PCI_CLASS_NETWORK_ETHERNET, 0x00,
423 sizeof(struct virtio_net_config),
428 n->vdev.get_config = virtio_net_get_config;
429 n->vdev.set_config = virtio_net_set_config;
430 n->vdev.get_features = virtio_net_get_features;
431 n->vdev.set_features = virtio_net_set_features;
432 n->vdev.reset = virtio_net_reset;
433 n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
434 n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx);
435 n->ctrl_vq = virtio_add_queue(&n->vdev, 16, virtio_net_handle_ctrl);
436 memcpy(n->mac, nd->macaddr, ETH_ALEN);
437 n->status = VIRTIO_NET_S_LINK_UP;
438 n->vc = qemu_new_vlan_client(nd->vlan, nd->model, nd->name,
439 virtio_net_receive, virtio_net_can_receive, n);
440 n->vc->link_status_changed = virtio_net_set_link_status;
442 qemu_format_nic_info_str(n->vc, n->mac);
444 n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n);
445 n->tx_timer_active = 0;
446 n->mergeable_rx_bufs = 0;
447 n->promisc = 1; /* for compatibility */
449 register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION,
450 virtio_net_save, virtio_net_load, n);