2 * This file is part of the Palacios Virtual Machine Monitor developed
3 * by the V3VEE Project with funding from the United States National
4 * Science Foundation and the Department of Energy.
6 * The V3VEE Project is a joint project between Northwestern University
7 * and the University of New Mexico. You can find out more at
10 * Copyright (c) 2010, Lei Xia <lxia@northwestern.edu>
11 * Copyright (c) 2010, Cui Zheng <cuizheng@cs.unm.edu>
12 * Copyright (c) 2010, The V3VEE Project <http://www.v3vee.org>
13 * All rights reserved.
15 * Author: Lei Xia <lxia@northwestern.edu>
16 * Cui Zheng <cuizheng@cs.unm.edu>
19 * This is free software. You are permitted to use,
20 * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
23 #include <palacios/vmm.h>
24 #include <palacios/vmm_dev_mgr.h>
25 #include <devices/lnx_virtio_pci.h>
26 #include <palacios/vm_guest_mem.h>
27 #include <palacios/vmm_sprintf.h>
28 #include <palacios/vmm_vnet.h>
29 #include <palacios/vmm_lock.h>
30 #include <palacios/vmm_util.h>
31 #include <devices/pci.h>
34 #ifndef CONFIG_DEBUG_VIRTIO_NET
36 #define PrintDebug(fmt, args...)
39 #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
40 #define VIRTIO_NET_MAX_BUFSIZE (sizeof(struct virtio_net_hdr) + (64 << 10))
42 struct virtio_net_hdr {
45 #define VIRTIO_NET_HDR_GSO_NONE 0 /* Not a GSO frame */
47 uint16_t hdr_len; /* Ethernet + IP + tcp/udp hdrs */
48 uint16_t gso_size; /* Bytes to append to hdr_len per frame */
49 uint16_t csum_start; /* Position to start checksumming from */
50 uint16_t csum_offset; /* Offset after that to place checksum */
51 }__attribute__((packed));
54 /* This is the version of the header to use when the MRG_RXBUF
55 * feature has been negotiated. */
56 struct virtio_net_hdr_mrg_rxbuf {
57 struct virtio_net_hdr hdr;
58 uint16_t num_buffers; /* Number of merged rx buffers */
62 #define TX_QUEUE_SIZE 64
63 #define RX_QUEUE_SIZE 1024
64 #define CTRL_QUEUE_SIZE 64
67 #define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */
68 #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */
69 #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */
70 #define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */
72 struct virtio_net_config
74 uint8_t mac[ETH_ALEN]; /* VIRTIO_NET_F_MAC */
76 } __attribute__((packed));
78 struct virtio_dev_state {
79 struct vm_device * pci_bus;
80 struct list_head dev_list;
81 struct v3_vm_info *vm;
84 struct virtio_net_state {
85 struct virtio_net_config net_cfg;
86 struct virtio_config virtio_cfg;
88 struct vm_device * dev;
89 struct pci_device * pci_dev;
92 struct virtio_queue rx_vq; /* idx 0, pkts to guest */
93 struct virtio_queue tx_vq; /* idx 1, pkts from guest */
94 struct virtio_queue ctrl_vq; /* idx 2 */
97 int tx_disabled; /* stop TX pkts from guest */
99 uint64_t pkt_sent, pkt_recv, pkt_drop;
101 struct v3_dev_net_ops * net_ops;
102 v3_lock_t rx_lock, tx_lock;
105 struct virtio_dev_state * virtio_dev;
106 struct list_head dev_link;
109 /* virtio nic error type */
110 #define ERR_VIRTIO_OTHER 1
111 #define ERR_VIRTIO_RXQ_FULL 2
112 #define ERR_VIRTIO_RXQ_NOSET 3
113 #define ERR_VIRTIO_TXQ_NOSET 4
114 #define ERR_VIRTIO_TXQ_FULL 5
115 #define ERR_VIRTIO_TXQ_DISABLED 6
118 static int virtio_free(struct vm_device * dev)
124 static int virtio_init_state(struct virtio_net_state * virtio)
126 virtio->rx_vq.queue_size = RX_QUEUE_SIZE;
127 virtio->tx_vq.queue_size = TX_QUEUE_SIZE;
128 virtio->ctrl_vq.queue_size = CTRL_QUEUE_SIZE;
130 virtio->rx_vq.ring_desc_addr = 0;
131 virtio->rx_vq.ring_avail_addr = 0;
132 virtio->rx_vq.ring_used_addr = 0;
133 virtio->rx_vq.pfn = 0;
134 virtio->rx_vq.cur_avail_idx = 0;
136 virtio->tx_vq.ring_desc_addr = 0;
137 virtio->tx_vq.ring_avail_addr = 0;
138 virtio->tx_vq.ring_used_addr = 0;
139 virtio->tx_vq.pfn = 0;
140 virtio->tx_vq.cur_avail_idx = 0;
142 virtio->ctrl_vq.ring_desc_addr = 0;
143 virtio->ctrl_vq.ring_avail_addr = 0;
144 virtio->ctrl_vq.ring_used_addr = 0;
145 virtio->ctrl_vq.pfn = 0;
146 virtio->ctrl_vq.cur_avail_idx = 0;
148 virtio->virtio_cfg.pci_isr = 0;
150 virtio->virtio_cfg.host_features = 0; // (1 << VIRTIO_NET_F_MAC);
152 if ((v3_lock_init(&(virtio->rx_lock)) == -1) ||
153 (v3_lock_init(&(virtio->tx_lock)) == -1)){
154 PrintError("Virtio NIC: Failure to init locks for net_state\n");
157 virtio->pkt_sent = virtio->pkt_recv = virtio->pkt_drop = 0;
158 virtio->buffed_rx = 0;
164 pkt_tx(struct guest_info * core,
165 struct virtio_net_state * virtio,
166 struct vring_desc * buf_desc)
168 uint8_t * buf = NULL;
169 uint32_t len = buf_desc->length;
171 if (v3_gpa_to_hva(core, buf_desc->addr_gpa, (addr_t *)&(buf)) == -1) {
172 PrintError("Could not translate buffer address\n");
173 return -ERR_VIRTIO_OTHER;
176 return virtio->net_ops->send(buf, len, virtio->backend_data, NULL);
181 copy_data_to_desc(struct guest_info * core,
182 struct virtio_net_state * virtio_state,
183 struct vring_desc * desc,
189 uint8_t * desc_buf = NULL;
191 if (v3_gpa_to_hva(core, desc->addr_gpa, (addr_t *)&(desc_buf)) == -1) {
192 PrintError("Could not translate buffer address\n");
195 len = (desc->length < buf_len)?(desc->length - offset):buf_len;
196 memcpy(desc_buf+offset, buf, len);
202 static int get_desc_count(struct virtio_queue * q, int index) {
203 struct vring_desc * tmp_desc = &(q->desc[index]);
206 while (tmp_desc->flags & VIRTIO_NEXT_FLAG) {
207 tmp_desc = &(q->desc[tmp_desc->next]);
214 static inline void enable_cb(struct virtio_queue *queue){
215 queue->used->flags &= ~ VRING_NO_NOTIFY_FLAG;
218 static inline void disable_cb(struct virtio_queue *queue) {
219 queue->used->flags |= VRING_NO_NOTIFY_FLAG;
223 /* interrupt the guest, so the guest core get EXIT to Palacios
224 * this happens when there are either incoming pkts for the guest
225 * or the guest can start TX pkts again */
226 static inline void notify_guest(struct virtio_net_state * virtio){
227 v3_interrupt_cpu(virtio->virtio_dev->vm, virtio->virtio_dev->vm->cores[0].cpu_id, 0);
231 /* guest free some pkts from rx queue */
232 static int handle_rx_kick(struct guest_info *core,
233 struct virtio_net_state * virtio)
237 flags = v3_lock_irqsave(virtio->rx_lock);
239 virtio->net_ops->start_rx(virtio->backend_data);
240 //disable_cb(&virtio->rx_vq);
242 v3_unlock_irqrestore(virtio->rx_lock, flags);
248 static int handle_ctrl(struct guest_info *core,
249 struct virtio_net_state * virtio) {
254 static int handle_pkt_tx(struct guest_info *core,
255 struct virtio_net_state * virtio_state)
257 struct virtio_queue * q = &(virtio_state->tx_vq);
258 struct virtio_net_hdr * hdr = NULL;
262 if (!q->ring_avail_addr)
263 return -ERR_VIRTIO_TXQ_NOSET;
265 if(virtio_state->tx_disabled)
266 return -ERR_VIRTIO_TXQ_DISABLED;
268 flags = v3_lock_irqsave(virtio_state->tx_lock);
269 while (q->cur_avail_idx != q->avail->index) {
270 struct vring_desc * hdr_desc = NULL;
272 uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
273 int desc_cnt = get_desc_count(q, desc_idx);
274 uint32_t req_len = 0;
277 hdr_desc = &(q->desc[desc_idx]);
278 if (v3_gpa_to_hva(core, hdr_desc->addr_gpa, &(hdr_addr)) == -1) {
279 PrintError("Could not translate block header address\n");
283 hdr = (struct virtio_net_hdr*)hdr_addr;
284 desc_idx = hdr_desc->next;
287 PrintError("VNIC: merged rx buffer not supported\n");
291 /* here we assumed that one ethernet pkt is not splitted into multiple virtio buffer */
292 for (i = 0; i < desc_cnt - 1; i++) {
293 struct vring_desc * buf_desc = &(q->desc[desc_idx]);
294 if (pkt_tx(core, virtio_state, buf_desc) == -1) {
295 PrintError("Error handling nic operation\n");
299 req_len += buf_desc->length;
300 desc_idx = buf_desc->next;
302 virtio_state->pkt_sent ++;
305 q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
306 q->used->ring[q->used->index % q->queue_size].length = req_len; // What do we set this to????
312 v3_unlock_irqrestore(virtio_state->tx_lock, flags);
317 if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
318 v3_pci_raise_irq(virtio_state->virtio_dev->pci_bus, 0, virtio_state->pci_dev);
319 virtio_state->virtio_cfg.pci_isr = 0x1;
326 v3_unlock_irqrestore(virtio_state->tx_lock, flags);
327 return -ERR_VIRTIO_OTHER;
331 static int virtio_setup_queue(struct guest_info *core,
332 struct virtio_net_state * virtio_state,
333 struct virtio_queue * queue,
334 addr_t pfn, addr_t page_addr) {
337 queue->ring_desc_addr = page_addr;
338 queue->ring_avail_addr = page_addr + (queue->queue_size * sizeof(struct vring_desc));
339 queue->ring_used_addr = ((queue->ring_avail_addr) +
340 (sizeof(struct vring_avail)) +
341 (queue->queue_size * sizeof(uint16_t)));
343 // round up to next page boundary.
344 queue->ring_used_addr = (queue->ring_used_addr + 0xfff) & ~0xfff;
345 if (v3_gpa_to_hva(core, queue->ring_desc_addr, (addr_t *)&(queue->desc)) == -1) {
346 PrintError("Could not translate ring descriptor address\n");
350 if (v3_gpa_to_hva(core, queue->ring_avail_addr, (addr_t *)&(queue->avail)) == -1) {
351 PrintError("Could not translate ring available address\n");
355 if (v3_gpa_to_hva(core, queue->ring_used_addr, (addr_t *)&(queue->used)) == -1) {
356 PrintError("Could not translate ring used address\n");
360 PrintDebug("RingDesc_addr=%p, Avail_addr=%p, Used_addr=%p\n",
361 (void *)(queue->ring_desc_addr),
362 (void *)(queue->ring_avail_addr),
363 (void *)(queue->ring_used_addr));
365 PrintDebug("RingDesc=%p, Avail=%p, Used=%p\n",
366 queue->desc, queue->avail, queue->used);
371 static int virtio_io_write(struct guest_info *core,
372 uint16_t port, void * src,
373 uint_t length, void * private_data)
375 struct virtio_net_state * virtio = (struct virtio_net_state *)private_data;
376 int port_idx = port % virtio->io_range_size;
378 PrintDebug("VIRTIO NIC %p Write for port %d (index=%d) len=%d, value=%x\n", private_data,
379 port, port_idx, length, *(uint32_t *)src);
382 case GUEST_FEATURES_PORT:
384 PrintError("Illegal write length for guest features\n");
387 virtio->virtio_cfg.guest_features = *(uint32_t *)src;
390 case VRING_PG_NUM_PORT:
392 PrintError("Illegal write length for page frame number\n");
395 addr_t pfn = *(uint32_t *)src;
396 addr_t page_addr = (pfn << VIRTIO_PAGE_SHIFT);
397 uint16_t queue_idx = virtio->virtio_cfg.vring_queue_selector;
400 virtio_setup_queue(core, virtio, &virtio->rx_vq, pfn, page_addr);
401 //disable_cb(&virtio->rx_vq);
404 virtio_setup_queue(core, virtio, &virtio->tx_vq, pfn, page_addr);
405 //disable_cb(&virtio->tx_vq);
408 virtio_setup_queue(core, virtio, &virtio->ctrl_vq, pfn, page_addr);
415 case VRING_Q_SEL_PORT:
416 virtio->virtio_cfg.vring_queue_selector = *(uint16_t *)src;
417 if (virtio->virtio_cfg.vring_queue_selector > 2) {
418 PrintError("Virtio NIC: wrong queue idx: %d\n",
419 virtio->virtio_cfg.vring_queue_selector);
424 case VRING_Q_NOTIFY_PORT:
426 uint16_t queue_idx = *(uint16_t *)src;
428 handle_rx_kick(core, virtio);
429 } else if (queue_idx == 1){
430 if (handle_pkt_tx(core, virtio) == -1) {
431 PrintError("Could not handle NIC Notification\n");
434 } else if (queue_idx == 2){
435 if (handle_ctrl(core, virtio) == -1) {
436 PrintError("Could not handle NIC Notification\n");
440 PrintError("Wrong queue index %d\n", queue_idx);
445 case VIRTIO_STATUS_PORT:
446 virtio->virtio_cfg.status = *(uint8_t *)src;
447 if (virtio->virtio_cfg.status == 0) {
448 PrintDebug("Resetting device\n");
449 virtio_init_state(virtio);
453 case VIRTIO_ISR_PORT:
454 virtio->virtio_cfg.pci_isr = *(uint8_t *)src;
465 static int virtio_io_read(struct guest_info *core,
466 uint16_t port, void * dst,
467 uint_t length, void * private_data)
469 struct virtio_net_state * virtio = (struct virtio_net_state *)private_data;
470 int port_idx = port % virtio->io_range_size;
471 uint16_t queue_idx = virtio->virtio_cfg.vring_queue_selector;
473 PrintDebug("Virtio NIC %p: Read for port %d (index =%d), length=%d\n", private_data,
474 port, port_idx, length);
477 case HOST_FEATURES_PORT:
479 PrintError("Illegal read length for host features\n");
482 *(uint32_t *)dst = virtio->virtio_cfg.host_features;
485 case VRING_PG_NUM_PORT:
487 PrintError("Illegal read length for page frame number\n");
492 *(uint32_t *)dst = virtio->rx_vq.pfn;
495 *(uint32_t *)dst = virtio->tx_vq.pfn;
498 *(uint32_t *)dst = virtio->ctrl_vq.pfn;
505 case VRING_SIZE_PORT:
507 PrintError("Illegal read length for vring size\n");
512 *(uint16_t *)dst = virtio->rx_vq.queue_size;
515 *(uint16_t *)dst = virtio->tx_vq.queue_size;
518 *(uint16_t *)dst = virtio->ctrl_vq.queue_size;
525 case VIRTIO_STATUS_PORT:
527 PrintError("Illegal read length for status\n");
530 *(uint8_t *)dst = virtio->virtio_cfg.status;
533 case VIRTIO_ISR_PORT:
534 *(uint8_t *)dst = virtio->virtio_cfg.pci_isr;
535 virtio->virtio_cfg.pci_isr = 0;
536 v3_pci_lower_irq(virtio->virtio_dev->pci_bus, 0, virtio->pci_dev);
540 PrintError("Virtio NIC: Read of Unhandled Virtio Read:%d\n", port_idx);
548 static int virtio_rx(uint8_t * buf, uint32_t size, void * private_data) {
549 struct virtio_net_state * virtio = (struct virtio_net_state *)private_data;
550 struct virtio_queue * q = &(virtio->rx_vq);
551 struct virtio_net_hdr_mrg_rxbuf hdr;
552 uint32_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
553 uint32_t data_len = size;
556 int ret_val = -ERR_VIRTIO_OTHER;
559 #ifndef CONFIG_DEBUG_VIRTIO_NET
561 PrintDebug("Virtio-NIC: virtio_rx: size: %d\n", size);
562 //v3_hexdump(buf, size, NULL, 0);
566 flags = v3_lock_irqsave(virtio->rx_lock);
573 memcpy(&hdr, buf, sizeof(struct virtio_net_hdr_mrg_rxbuf));
575 memset(&hdr, 0, sizeof(struct virtio_net_hdr_mrg_rxbuf));
577 if (q->ring_avail_addr == 0) {
578 PrintError("Queue is not set\n");
579 ret_val = -ERR_VIRTIO_RXQ_NOSET;
583 if (q->cur_avail_idx != q->avail->index){
585 uint16_t hdr_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
586 uint16_t buf_idx = 0;
587 struct vring_desc * hdr_desc = NULL;
589 hdr_desc = &(q->desc[hdr_idx]);
590 if (v3_gpa_to_hva(&(virtio->virtio_dev->vm->cores[0]), hdr_desc->addr_gpa, &(hdr_addr)) == -1) {
591 PrintError("Could not translate receive buffer address\n");
595 memcpy((void *)hdr_addr, &hdr, sizeof(struct virtio_net_hdr_mrg_rxbuf));
596 if (offset >= data_len) {
597 hdr_desc->flags &= ~VIRTIO_NEXT_FLAG;
600 struct vring_desc * buf_desc = NULL;
601 for (buf_idx = hdr_desc->next; offset < data_len; buf_idx = q->desc[hdr_idx].next) {
603 buf_desc = &(q->desc[buf_idx]);
605 len = copy_data_to_desc(&(virtio->virtio_dev->vm->cores[0]), virtio, buf_desc, buf + offset, data_len - offset, 0);
607 if (offset < data_len) {
608 buf_desc->flags = VIRTIO_NEXT_FLAG;
610 buf_desc->length = len;
612 buf_desc->flags &= ~VIRTIO_NEXT_FLAG;
614 q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
615 q->used->ring[q->used->index % q->queue_size].length = data_len + hdr_len; /* This should be the total length of data sent to guest (header+pkt_data) */
619 /* if there are certain num of pkts in the RX queue, notify guest
620 * so guest will exit to palacios
621 * when it returns, guest gets the virtio rx interrupt */
622 if((++virtio->buffed_rx > q->queue_size/5) &&
623 (q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
624 if(virtio->virtio_dev->vm->cores[0].cpu_id != V3_Get_CPU()){
625 notify_guest(virtio);
627 virtio->buffed_rx = 0;
631 /* RX queue is full, tell backend to stop RX on this device */
632 virtio->net_ops->stop_rx(virtio->backend_data);
633 enable_cb(&virtio->rx_vq);
635 ret_val = -ERR_VIRTIO_RXQ_FULL;
639 if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
640 PrintDebug("Raising IRQ %d\n", virtio->pci_dev->config_header.intr_line);
641 v3_pci_raise_irq(virtio->virtio_dev->pci_bus, 0, virtio->pci_dev);
642 virtio->virtio_cfg.pci_isr = 0x1;
649 v3_unlock_irqrestore(virtio->rx_lock, flags);
655 static struct v3_device_ops dev_ops = {
663 /* TODO: Issue here: which vm info it needs? calling VM or the device's own VM? */
664 static void virtio_nic_poll(struct v3_vm_info * vm, void * data){
665 struct virtio_net_state * virtio = (struct virtio_net_state *)data;
667 handle_pkt_tx(&(vm->cores[0]), virtio);
670 static void virtio_start_tx(void * data){
671 struct virtio_net_state * virtio = (struct virtio_net_state *)data;
674 flags = v3_lock_irqsave(virtio->tx_lock);
675 virtio->tx_disabled = 0;
677 /* notify the device's guest to start sending pkt */
678 if(virtio->virtio_dev->vm->cores[0].cpu_id != V3_Get_CPU()){
679 notify_guest(virtio);
681 v3_unlock_irqrestore(virtio->tx_lock, flags);
684 static void virtio_stop_tx(void * data){
685 struct virtio_net_state * virtio = (struct virtio_net_state *)data;
688 flags = v3_lock_irqsave(virtio->tx_lock);
689 virtio->tx_disabled = 1;
691 /* stop the guest to exit to palacios for sending pkt? */
692 if(virtio->virtio_dev->vm->cores[0].cpu_id != V3_Get_CPU()){
693 disable_cb(&virtio->tx_vq);
696 v3_unlock_irqrestore(virtio->tx_lock, flags);
702 static int register_dev(struct virtio_dev_state * virtio,
703 struct virtio_net_state * net_state)
705 struct pci_device * pci_dev = NULL;
706 struct v3_pci_bar bars[6];
707 int num_ports = sizeof(struct virtio_config);
708 int tmp_ports = num_ports;
711 // This gets the number of ports, rounded up to a power of 2
712 net_state->io_range_size = 1; // must be a power of 2
713 while (tmp_ports > 0) {
715 net_state->io_range_size <<= 1;
718 // this is to account for any low order bits being set in num_ports
719 // if there are none, then num_ports was already a power of 2 so we shift right to reset it
720 if ((num_ports & ((net_state->io_range_size >> 1) - 1)) == 0) {
721 net_state->io_range_size >>= 1;
724 for (i = 0; i < 6; i++) {
725 bars[i].type = PCI_BAR_NONE;
728 PrintDebug("Virtio-NIC io_range_size = %d\n", net_state->io_range_size);
730 bars[0].type = PCI_BAR_IO;
731 bars[0].default_base_port = -1;
732 bars[0].num_ports = net_state->io_range_size;
733 bars[0].io_read = virtio_io_read;
734 bars[0].io_write = virtio_io_write;
735 bars[0].private_data = net_state;
737 pci_dev = v3_pci_register_device(virtio->pci_bus, PCI_STD_DEVICE,
738 0, 4/*PCI_AUTO_DEV_NUM*/, 0,
739 "LNX_VIRTIO_NIC", bars,
740 NULL, NULL, NULL, net_state);
743 PrintError("Virtio NIC: Could not register PCI Device\n");
747 PrintDebug("Virtio NIC: registered to PCI bus\n");
749 pci_dev->config_header.vendor_id = VIRTIO_VENDOR_ID;
750 pci_dev->config_header.subsystem_vendor_id = VIRTIO_SUBVENDOR_ID;
753 pci_dev->config_header.device_id = VIRTIO_NET_DEV_ID;
754 pci_dev->config_header.class = PCI_CLASS_NETWORK;
755 pci_dev->config_header.subclass = PCI_NET_SUBCLASS_OTHER;
756 pci_dev->config_header.subsystem_id = VIRTIO_NET_SUBDEVICE_ID;
757 pci_dev->config_header.intr_pin = 1;
758 pci_dev->config_header.max_latency = 1; // ?? (qemu does it...)
760 net_state->pci_dev = pci_dev;
761 net_state->virtio_dev = virtio;
763 uchar_t mac[6] = {0x11,0x11,0x11,0x11,0x11,0x11};
764 memcpy(net_state->net_cfg.mac, mac, 6);
766 memcpy(pci_dev->config_data, net_state->net_cfg.mac, ETH_ALEN);
768 virtio_init_state(net_state);
773 static int connect_fn(struct v3_vm_info * info,
774 void * frontend_data,
775 struct v3_dev_net_ops * ops,
777 void * private_data) {
778 struct virtio_dev_state * virtio = (struct virtio_dev_state *)frontend_data;
779 struct virtio_net_state * net_state = (struct virtio_net_state *)V3_Malloc(sizeof(struct virtio_net_state));
781 memset(net_state, 0, sizeof(struct virtio_net_state));
782 register_dev(virtio, net_state);
784 net_state->net_ops = ops;
785 net_state->backend_data = private_data;
787 ops->recv = virtio_rx;
788 ops->poll = virtio_nic_poll;
789 ops->start_tx = virtio_start_tx;
790 ops->stop_tx = virtio_stop_tx;
791 ops->frontend_data = net_state;
796 static int virtio_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
797 struct vm_device * pci_bus = v3_find_dev(vm, v3_cfg_val(cfg, "bus"));
798 struct virtio_dev_state * virtio_state = NULL;
799 char * dev_id = v3_cfg_val(cfg, "ID");
801 PrintDebug("Virtio NIC: Initializing VIRTIO Network device: %s\n", dev_id);
803 if (pci_bus == NULL) {
804 PrintError("Virtio NIC: VirtIO devices require a PCI Bus");
808 virtio_state = (struct virtio_dev_state *)V3_Malloc(sizeof(struct virtio_dev_state));
809 memset(virtio_state, 0, sizeof(struct virtio_dev_state));
811 INIT_LIST_HEAD(&(virtio_state->dev_list));
812 virtio_state->pci_bus = pci_bus;
813 virtio_state->vm = vm;
815 struct vm_device * dev = v3_allocate_device(dev_id, &dev_ops, virtio_state);
816 if (v3_attach_device(vm, dev) == -1) {
817 PrintError("Virtio NIC: Could not attach device %s\n", dev_id);
821 if (v3_dev_add_net_frontend(vm, dev_id, connect_fn, (void *)virtio_state) == -1) {
822 PrintError("Virtio NIC: Could not register %s as net frontend\n", dev_id);
829 device_register("LNX_VIRTIO_NIC", virtio_init)