3 * This file is part of the Palacios Virtual Machine Monitor developed
4 * by the V3VEE Project with funding from the United States National
5 * Science Foundation and the Department of Energy.
7 * The V3VEE Project is a joint project between Northwestern University
8 * and the University of New Mexico. You can find out more at
11 * Copyright (c) 2010, Lei Xia <lxia@northwestern.edu>
12 * Copyright (c) 2010, Cui Zheng <cuizheng@cs.unm.edu>
13 * Copyright (c) 2010, The V3VEE Project <http://www.v3vee.org>
14 * All rights reserved.
16 * Author: Lei Xia <lxia@northwestern.edu>
17 * Cui Zheng <cuizheng@cs.unm.edu>
20 * This is free software. You are permitted to use,
21 * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
24 #include <palacios/vmm.h>
25 #include <palacios/vmm_dev_mgr.h>
26 #include <devices/lnx_virtio_pci.h>
27 #include <palacios/vm_guest_mem.h>
28 #include <palacios/vmm_sprintf.h>
29 #include <vnet/vnet.h>
30 #include <palacios/vmm_lock.h>
31 #include <palacios/vmm_util.h>
32 #include <devices/pci.h>
33 #include <palacios/vmm_ethernet.h>
34 #include <palacios/vmm_time.h>
37 #ifndef V3_CONFIG_DEBUG_VIRTIO_NET
39 #define PrintDebug(fmt, args...)
42 #ifndef V3_CONFIG_VNET
43 static int net_debug = 0;
46 #define TX_QUEUE_SIZE 4096
47 #define RX_QUEUE_SIZE 4096
48 #define CTRL_QUEUE_SIZE 64
50 /* The feature bitmap for virtio nic
52 #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */
53 #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */
54 #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */
55 #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */
56 #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */
57 #define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */
58 #define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */
59 #define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */
60 #define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */
61 #define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */
62 #define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */
63 #define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */
64 #define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */
65 #define VIRTIO_NET_F_STATUS 16 /* virtio_net_config.status available */
67 /* Port to get virtio config */
68 #define VIRTIO_NET_CONFIG 20
70 #define VIRTIO_NET_MAX_BUFSIZE (sizeof(struct virtio_net_hdr) + (64 << 10))
72 /* for gso_type in virtio_net_hdr */
73 #define VIRTIO_NET_HDR_GSO_NONE 0
74 #define VIRTIO_NET_HDR_GSO_TCPV4 1 /* GSO frame, IPv4 TCP (TSO) */
75 #define VIRTIO_NET_HDR_GSO_UDP 3 /* GSO frame, IPv4 UDP (UFO) */
76 #define VIRTIO_NET_HDR_GSO_TCPV6 4 /* GSO frame, IPv6 TCP */
77 #define VIRTIO_NET_HDR_GSO_ECN 0x80 /* TCP has ECN set */
80 /* for flags in virtio_net_hdr */
81 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /* Use csum_start, csum_offset */
84 /* First element of the scatter-gather list, used with GSO or CSUM features */
89 uint16_t hdr_len; /* Ethernet + IP + tcp/udp hdrs */
90 uint16_t gso_size; /* Bytes to append to hdr_len per frame */
91 uint16_t csum_start; /* Position to start checksumming from */
92 uint16_t csum_offset; /* Offset after that to place checksum */
93 }__attribute__((packed));
96 /* The header to use when the MRG_RXBUF
97 * feature has been negotiated. */
98 struct virtio_net_hdr_mrg_rxbuf {
99 struct virtio_net_hdr hdr;
100 uint16_t num_buffers; /* Number of merged rx buffers */
103 struct virtio_net_config
105 uint8_t mac[ETH_ALEN]; /* VIRTIO_NET_F_MAC */
107 } __attribute__((packed));
109 struct virtio_dev_state {
110 struct vm_device * pci_bus;
111 struct list_head dev_list;
112 struct v3_vm_info *vm;
114 uint8_t mac[ETH_ALEN];
117 struct virtio_net_state {
118 struct virtio_net_config net_cfg;
119 struct virtio_config virtio_cfg;
121 struct v3_vm_info * vm;
122 struct vm_device * dev;
123 struct pci_device * pci_dev;
128 struct virtio_queue rx_vq; /* idx 0*/
129 struct virtio_queue tx_vq; /* idx 1*/
130 struct virtio_queue ctrl_vq; /* idx 2*/
132 uint8_t mergeable_rx_bufs;
134 struct v3_timer * timer;
135 struct nic_statistics stats;
137 struct v3_dev_net_ops * net_ops;
138 v3_lock_t rx_lock, tx_lock;
140 uint8_t tx_notify, rx_notify;
141 uint32_t tx_pkts, rx_pkts;
145 struct virtio_dev_state * virtio_dev;
146 struct list_head dev_link;
150 static int virtio_init_state(struct virtio_net_state * virtio)
152 virtio->rx_vq.queue_size = RX_QUEUE_SIZE;
153 virtio->tx_vq.queue_size = TX_QUEUE_SIZE;
154 virtio->ctrl_vq.queue_size = CTRL_QUEUE_SIZE;
156 virtio->rx_vq.ring_desc_addr = 0;
157 virtio->rx_vq.ring_avail_addr = 0;
158 virtio->rx_vq.ring_used_addr = 0;
159 virtio->rx_vq.pfn = 0;
160 virtio->rx_vq.cur_avail_idx = 0;
162 virtio->tx_vq.ring_desc_addr = 0;
163 virtio->tx_vq.ring_avail_addr = 0;
164 virtio->tx_vq.ring_used_addr = 0;
165 virtio->tx_vq.pfn = 0;
166 virtio->tx_vq.cur_avail_idx = 0;
168 virtio->ctrl_vq.ring_desc_addr = 0;
169 virtio->ctrl_vq.ring_avail_addr = 0;
170 virtio->ctrl_vq.ring_used_addr = 0;
171 virtio->ctrl_vq.pfn = 0;
172 virtio->ctrl_vq.cur_avail_idx = 0;
174 virtio->virtio_cfg.pci_isr = 0;
176 virtio->mergeable_rx_bufs = 1;
178 virtio->virtio_cfg.host_features = 0 | (1 << VIRTIO_NET_F_MAC);
179 if(virtio->mergeable_rx_bufs) {
180 virtio->virtio_cfg.host_features |= (1 << VIRTIO_NET_F_MRG_RXBUF);
183 if ((v3_lock_init(&(virtio->rx_lock)) == -1) ||
184 (v3_lock_init(&(virtio->tx_lock)) == -1)){
185 PrintError("Virtio NIC: Failure to init locks for net_state\n");
191 static int tx_one_pkt(struct guest_info * core,
192 struct virtio_net_state * virtio,
193 struct vring_desc * buf_desc)
195 uint8_t * buf = NULL;
196 uint32_t len = buf_desc->length;
198 if (v3_gpa_to_hva(core, buf_desc->addr_gpa, (addr_t *)&(buf)) == -1) {
199 PrintDebug("Could not translate buffer address\n");
203 V3_Net_Print(2, "Virtio-NIC: virtio_tx: size: %d\n", len);
205 v3_hexdump(buf, len, NULL, 0);
208 if(virtio->net_ops->send(buf, len, virtio->backend_data) < 0){
209 virtio->stats.tx_dropped ++;
213 virtio->stats.tx_pkts ++;
214 virtio->stats.tx_bytes += len;
220 /*copy data into ring buffer */
221 static inline int copy_data_to_desc(struct guest_info * core,
222 struct virtio_net_state * virtio_state,
223 struct vring_desc * desc,
228 uint8_t * desc_buf = NULL;
230 if (v3_gpa_to_hva(core, desc->addr_gpa, (addr_t *)&(desc_buf)) == -1) {
231 PrintDebug("Could not translate buffer address\n");
234 len = (desc->length < (buf_len+dst_offset))?(desc->length - dst_offset):buf_len;
235 memcpy(desc_buf + dst_offset, buf, len);
241 static inline int get_desc_count(struct virtio_queue * q, int index) {
242 struct vring_desc * tmp_desc = &(q->desc[index]);
245 while (tmp_desc->flags & VIRTIO_NEXT_FLAG) {
246 tmp_desc = &(q->desc[tmp_desc->next]);
253 static inline void enable_cb(struct virtio_queue *queue){
255 queue->used->flags &= ~ VRING_NO_NOTIFY_FLAG;
259 static inline void disable_cb(struct virtio_queue *queue) {
261 queue->used->flags |= VRING_NO_NOTIFY_FLAG;
265 static int handle_pkt_tx(struct guest_info * core,
266 struct virtio_net_state * virtio_state,
269 struct virtio_queue * q;
270 int txed = 0, left = 0;
273 q = &(virtio_state->tx_vq);
274 if (!q->ring_avail_addr) {
279 struct vring_desc * hdr_desc = NULL;
281 uint16_t desc_idx, tmp_idx;
284 flags = v3_lock_irqsave(virtio_state->tx_lock);
286 if(q->cur_avail_idx == q->avail->index ||
287 (quote > 0 && txed >= quote)) {
288 left = (q->cur_avail_idx != q->avail->index);
289 v3_unlock_irqrestore(virtio_state->tx_lock, flags);
293 desc_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
294 tmp_idx = q->cur_avail_idx ++;
296 v3_unlock_irqrestore(virtio_state->tx_lock, flags);
298 desc_cnt = get_desc_count(q, desc_idx);
300 PrintError("VNIC: merged rx buffer not supported, desc_cnt %d\n", desc_cnt);
303 hdr_desc = &(q->desc[desc_idx]);
304 if (v3_gpa_to_hva(core, hdr_desc->addr_gpa, &(hdr_addr)) != -1) {
305 struct virtio_net_hdr_mrg_rxbuf * hdr;
306 struct vring_desc * buf_desc;
308 hdr = (struct virtio_net_hdr_mrg_rxbuf *)hdr_addr;
309 desc_idx = hdr_desc->next;
311 /* here we assumed that one ethernet pkt is not splitted into multiple buffer */
312 buf_desc = &(q->desc[desc_idx]);
313 if (tx_one_pkt(core, virtio_state, buf_desc) == -1) {
314 PrintError("Virtio NIC: Fails to send packet\n");
317 PrintError("Could not translate block header address\n");
320 flags = v3_lock_irqsave(virtio_state->tx_lock);
322 q->used->ring[q->used->index % q->queue_size].id =
323 q->avail->ring[tmp_idx % q->queue_size];
327 v3_unlock_irqrestore(virtio_state->tx_lock, flags);
332 if (txed && !(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
333 v3_pci_raise_irq(virtio_state->virtio_dev->pci_bus,
334 virtio_state->pci_dev, 0);
335 virtio_state->virtio_cfg.pci_isr = 0x1;
336 virtio_state->stats.rx_interrupts ++;
343 static int virtio_setup_queue(struct guest_info *core,
344 struct virtio_net_state * virtio_state,
345 struct virtio_queue * queue,
346 addr_t pfn, addr_t page_addr) {
349 queue->ring_desc_addr = page_addr;
350 queue->ring_avail_addr = page_addr + (queue->queue_size * sizeof(struct vring_desc));
351 queue->ring_used_addr = ((queue->ring_avail_addr) +
352 (sizeof(struct vring_avail)) +
353 (queue->queue_size * sizeof(uint16_t)));
355 // round up to next page boundary.
356 queue->ring_used_addr = (queue->ring_used_addr + 0xfff) & ~0xfff;
357 if (v3_gpa_to_hva(core, queue->ring_desc_addr, (addr_t *)&(queue->desc)) == -1) {
358 PrintError("Could not translate ring descriptor address\n");
362 if (v3_gpa_to_hva(core, queue->ring_avail_addr, (addr_t *)&(queue->avail)) == -1) {
363 PrintError("Could not translate ring available address\n");
367 if (v3_gpa_to_hva(core, queue->ring_used_addr, (addr_t *)&(queue->used)) == -1) {
368 PrintError("Could not translate ring used address\n");
372 PrintDebug("RingDesc_addr=%p, Avail_addr=%p, Used_addr=%p\n",
373 (void *)(queue->ring_desc_addr),
374 (void *)(queue->ring_avail_addr),
375 (void *)(queue->ring_used_addr));
377 PrintDebug("RingDesc=%p, Avail=%p, Used=%p\n",
378 queue->desc, queue->avail, queue->used);
383 static int virtio_io_write(struct guest_info *core,
384 uint16_t port, void * src,
385 uint_t length, void * private_data)
387 struct virtio_net_state * virtio = (struct virtio_net_state *)private_data;
388 int port_idx = port % virtio->io_range_size;
390 PrintDebug("VIRTIO NIC %p Write for port %d (index=%d) len=%d, value=%x\n",
391 private_data, port, port_idx,
392 length, *(uint32_t *)src);
395 case GUEST_FEATURES_PORT:
397 PrintError("Illegal write length for guest features\n");
400 virtio->virtio_cfg.guest_features = *(uint32_t *)src;
403 case VRING_PG_NUM_PORT:
405 PrintError("Illegal write length for page frame number\n");
408 addr_t pfn = *(uint32_t *)src;
409 addr_t page_addr = (pfn << VIRTIO_PAGE_SHIFT);
410 uint16_t queue_idx = virtio->virtio_cfg.vring_queue_selector;
413 virtio_setup_queue(core, virtio,
418 virtio_setup_queue(core, virtio,
421 if(virtio->tx_notify == 0){
422 disable_cb(&virtio->tx_vq);
427 virtio_setup_queue(core, virtio,
436 case VRING_Q_SEL_PORT:
437 virtio->virtio_cfg.vring_queue_selector = *(uint16_t *)src;
438 if (virtio->virtio_cfg.vring_queue_selector > 2) {
439 PrintError("Virtio NIC: wrong queue idx: %d\n",
440 virtio->virtio_cfg.vring_queue_selector);
445 case VRING_Q_NOTIFY_PORT:
447 uint16_t queue_idx = *(uint16_t *)src;
449 /* receive queue refill */
450 virtio->stats.tx_interrupts ++;
451 } else if (queue_idx == 1){
452 if (handle_pkt_tx(core, virtio, 0) < 0) {
453 PrintError("Virtio NIC: Error to handle packet TX\n");
456 virtio->stats.tx_interrupts ++;
457 } else if (queue_idx == 2){
460 PrintError("Virtio NIC: Wrong queue index %d\n", queue_idx);
465 case VIRTIO_STATUS_PORT:
466 virtio->virtio_cfg.status = *(uint8_t *)src;
467 if (virtio->virtio_cfg.status == 0) {
468 virtio_init_state(virtio);
472 case VIRTIO_ISR_PORT:
473 virtio->virtio_cfg.pci_isr = *(uint8_t *)src;
484 static int virtio_io_read(struct guest_info *core,
485 uint16_t port, void * dst,
486 uint_t length, void * private_data)
488 struct virtio_net_state * virtio = (struct virtio_net_state *)private_data;
489 int port_idx = port % virtio->io_range_size;
490 uint16_t queue_idx = virtio->virtio_cfg.vring_queue_selector;
492 PrintDebug("Virtio NIC %p: Read for port 0x%x (index =%d), length=%d\n",
493 private_data, port, port_idx, length);
496 case HOST_FEATURES_PORT:
498 PrintError("Virtio NIC: Illegal read length for host features\n");
501 *(uint32_t *)dst = virtio->virtio_cfg.host_features;
504 case VRING_PG_NUM_PORT:
506 PrintError("Virtio NIC: Illegal read length for page frame number\n");
511 *(uint32_t *)dst = virtio->rx_vq.pfn;
514 *(uint32_t *)dst = virtio->tx_vq.pfn;
517 *(uint32_t *)dst = virtio->ctrl_vq.pfn;
524 case VRING_SIZE_PORT:
526 PrintError("Virtio NIC: Illegal read length for vring size\n");
531 *(uint16_t *)dst = virtio->rx_vq.queue_size;
534 *(uint16_t *)dst = virtio->tx_vq.queue_size;
537 *(uint16_t *)dst = virtio->ctrl_vq.queue_size;
544 case VIRTIO_STATUS_PORT:
546 PrintError("Virtio NIC: Illegal read length for status\n");
549 *(uint8_t *)dst = virtio->virtio_cfg.status;
552 case VIRTIO_ISR_PORT:
553 *(uint8_t *)dst = virtio->virtio_cfg.pci_isr;
554 virtio->virtio_cfg.pci_isr = 0;
555 v3_pci_lower_irq(virtio->virtio_dev->pci_bus,
559 case VIRTIO_NET_CONFIG ... VIRTIO_NET_CONFIG + ETH_ALEN:
560 *(uint8_t *)dst = virtio->net_cfg.mac[port_idx-VIRTIO_NET_CONFIG];
564 PrintError("Virtio NIC: Read of Unhandled Virtio Read:%d\n",
573 /* receiving raw ethernet pkt from backend */
574 static int virtio_rx(uint8_t * buf, uint32_t size, void * private_data) {
575 struct virtio_net_state * virtio = (struct virtio_net_state *)private_data;
576 struct virtio_queue * q = &(virtio->rx_vq);
577 struct virtio_net_hdr_mrg_rxbuf hdr;
579 uint8_t kick_guest = 0;
581 V3_Net_Print(2, "Virtio NIC: virtio_rx: size: %d\n", size);
583 if (!q->ring_avail_addr) {
584 V3_Net_Print(2, "Virtio NIC: RX Queue not set\n");
585 virtio->stats.rx_dropped ++;
590 memset(&hdr, 0, sizeof(struct virtio_net_hdr_mrg_rxbuf));
592 flags = v3_lock_irqsave(virtio->rx_lock);
594 if (q->cur_avail_idx != q->avail->index){
596 struct vring_desc * buf_desc;
597 uint32_t hdr_len, len;
600 hdr_len = (virtio->mergeable_rx_bufs)?
601 sizeof(struct virtio_net_hdr_mrg_rxbuf):
602 sizeof(struct virtio_net_hdr);
604 if(virtio->mergeable_rx_bufs){/* merged buffer */
605 struct vring_desc * hdr_desc;
606 uint16_t old_idx = q->cur_avail_idx;
608 buf_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
609 hdr_desc = &(q->desc[buf_idx]);
611 len = copy_data_to_desc(&(virtio->virtio_dev->vm->cores[0]),
612 virtio, hdr_desc, buf, size, hdr_len);
618 q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
619 q->used->ring[q->used->index % q->queue_size].length = hdr_len + offset;
623 while(offset < size) {
624 buf_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
625 buf_desc = &(q->desc[buf_idx]);
627 len = copy_data_to_desc(&(virtio->virtio_dev->vm->cores[0]),
628 virtio, buf_desc, buf+offset, size-offset, 0);
630 V3_Net_Print(2, "Virtio NIC: merged buffer, %d buffer size %d\n",
631 hdr.num_buffers, len);
632 q->cur_avail_idx = old_idx;
636 buf_desc->flags &= ~VIRTIO_NEXT_FLAG;
638 q->used->ring[(q->used->index + hdr.num_buffers) % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
639 q->used->ring[(q->used->index + hdr.num_buffers) % q->queue_size].length = len;
645 copy_data_to_desc(&(virtio->virtio_dev->vm->cores[0]),
646 virtio, hdr_desc, (uchar_t *)&hdr, hdr_len, 0);
647 q->used->index += hdr.num_buffers;
649 buf_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
650 buf_desc = &(q->desc[buf_idx]);
653 len = copy_data_to_desc(&(virtio->virtio_dev->vm->cores[0]),
654 virtio, buf_desc, (uchar_t *)&(hdr.hdr), hdr_len, 0);
656 V3_Net_Print(2, "Virtio NIC: rx copy header error %d, hdr_len %d\n",
661 len = copy_data_to_desc(&(virtio->virtio_dev->vm->cores[0]),
662 virtio, buf_desc, buf, size, hdr_len);
664 V3_Net_Print(2, "Virtio NIC: rx copy data error %d\n", len);
669 /* copy rest of data */
670 while(offset < size &&
671 (buf_desc->flags & VIRTIO_NEXT_FLAG)){
672 buf_desc = &(q->desc[buf_desc->next]);
673 len = copy_data_to_desc(&(virtio->virtio_dev->vm->cores[0]),
674 virtio, buf_desc, buf+offset, size-offset, 0);
680 buf_desc->flags &= ~VIRTIO_NEXT_FLAG;
683 V3_Net_Print(2, "Virtio NIC: rx not enough ring buffer, buffer size %d\n",
688 q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
689 q->used->ring[q->used->index % q->queue_size].length = size + hdr_len; /* This should be the total length of data sent to guest (header+pkt_data) */
694 virtio->stats.rx_pkts ++;
695 virtio->stats.rx_bytes += size;
697 V3_Net_Print(2, "Virtio NIC: Guest RX queue is full\n");
698 virtio->stats.rx_dropped ++;
700 /* kick guest to refill RX queue */
704 v3_unlock_irqrestore(virtio->rx_lock, flags);
706 if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG) || kick_guest) {
707 V3_Net_Print(2, "Virtio NIC: RX Raising IRQ %d\n",
708 virtio->pci_dev->config_header.intr_line);
710 virtio->virtio_cfg.pci_isr = 0x1;
711 v3_pci_raise_irq(virtio->virtio_dev->pci_bus, virtio->pci_dev, 0);
712 virtio->stats.rx_interrupts ++;
715 /* notify guest if it is in guest mode */
716 if((kick_guest || virtio->rx_notify == 1) &&
717 V3_Get_CPU() != virtio->virtio_dev->vm->cores[0].pcpu_id){
718 v3_interrupt_cpu(virtio->virtio_dev->vm,
719 virtio->virtio_dev->vm->cores[0].pcpu_id,
726 virtio->stats.rx_dropped ++;
727 v3_unlock_irqrestore(virtio->rx_lock, flags);
732 static int virtio_free(struct virtio_dev_state * virtio) {
733 struct virtio_net_state * backend = NULL;
734 struct virtio_net_state * tmp = NULL;
737 list_for_each_entry_safe(backend, tmp, &(virtio->dev_list), dev_link) {
739 // unregister from PCI
741 list_del(&(backend->dev_link));
750 static struct v3_device_ops dev_ops = {
751 .free = (int (*)(void *))virtio_free,
755 static int virtio_poll(int quote, void * data){
756 struct virtio_net_state * virtio = (struct virtio_net_state *)data;
758 if (virtio->status) {
760 return handle_pkt_tx(&(virtio->vm->cores[0]), virtio, quote);
766 static int register_dev(struct virtio_dev_state * virtio,
767 struct virtio_net_state * net_state)
769 struct pci_device * pci_dev = NULL;
770 struct v3_pci_bar bars[6];
771 int num_ports = sizeof(struct virtio_config);
772 int tmp_ports = num_ports;
775 /* This gets the number of ports, rounded up to a power of 2 */
776 net_state->io_range_size = 1;
777 while (tmp_ports > 0) {
779 net_state->io_range_size <<= 1;
782 /* this is to account for any low order bits being set in num_ports
783 * if there are none, then num_ports was already a power of 2 so we shift right to reset it
785 if ((num_ports & ((net_state->io_range_size >> 1) - 1)) == 0) {
786 net_state->io_range_size >>= 1;
789 for (i = 0; i < 6; i++) {
790 bars[i].type = PCI_BAR_NONE;
793 PrintDebug("Virtio NIC: io_range_size = %d\n",
794 net_state->io_range_size);
796 bars[0].type = PCI_BAR_IO;
797 bars[0].default_base_port = -1;
798 bars[0].num_ports = net_state->io_range_size;
799 bars[0].io_read = virtio_io_read;
800 bars[0].io_write = virtio_io_write;
801 bars[0].private_data = net_state;
803 pci_dev = v3_pci_register_device(virtio->pci_bus, PCI_STD_DEVICE,
804 0, PCI_AUTO_DEV_NUM, 0,
805 "LNX_VIRTIO_NIC", bars,
806 NULL, NULL, NULL, NULL, net_state);
809 PrintError("Virtio NIC: Could not register PCI Device\n");
813 PrintDebug("Virtio NIC: registered to PCI bus\n");
815 pci_dev->config_header.vendor_id = VIRTIO_VENDOR_ID;
816 pci_dev->config_header.subsystem_vendor_id = VIRTIO_SUBVENDOR_ID;
819 pci_dev->config_header.device_id = VIRTIO_NET_DEV_ID;
820 pci_dev->config_header.class = PCI_CLASS_NETWORK;
821 pci_dev->config_header.subclass = PCI_NET_SUBCLASS_OTHER;
822 pci_dev->config_header.subsystem_id = VIRTIO_NET_SUBDEVICE_ID;
823 pci_dev->config_header.intr_pin = 1;
824 pci_dev->config_header.max_latency = 1; // ?? (qemu does it...)
826 net_state->pci_dev = pci_dev;
827 net_state->virtio_dev = virtio;
829 memcpy(net_state->net_cfg.mac, virtio->mac, 6);
831 virtio_init_state(net_state);
833 V3_Print("Virtio NIC: Registered Intr Line %d\n", pci_dev->config_header.intr_line);
835 /* Add backend to list of devices */
836 list_add(&(net_state->dev_link), &(virtio->dev_list));
842 #define RATE_UPPER_THRESHOLD 10 /* 10000 pkts per second, around 100Mbits */
843 #define RATE_LOWER_THRESHOLD 1
844 #define PROFILE_PERIOD 10000 /*us*/
846 static void virtio_nic_timer(struct guest_info * core,
847 uint64_t cpu_cycles, uint64_t cpu_freq,
849 struct virtio_net_state * net_state = (struct virtio_net_state *)priv_data;
851 static int profile_ms = 0;
853 if(!net_state->status){ /* VNIC is not in working status */
857 period_us = (1000*cpu_cycles)/cpu_freq;
858 net_state->past_us += period_us;
860 if(net_state->past_us > PROFILE_PERIOD){
861 uint32_t tx_rate, rx_rate;
863 tx_rate = (net_state->stats.tx_pkts - net_state->tx_pkts)/(net_state->past_us/1000); /* pkts/per ms */
864 rx_rate = (net_state->stats.rx_pkts - net_state->rx_pkts)/(net_state->past_us/1000);
866 net_state->tx_pkts = net_state->stats.tx_pkts;
867 net_state->rx_pkts = net_state->stats.rx_pkts;
869 if(tx_rate > RATE_UPPER_THRESHOLD && net_state->tx_notify == 1){
870 V3_Print("Virtio NIC: Switch TX to VMM driven mode\n");
871 disable_cb(&(net_state->tx_vq));
872 net_state->tx_notify = 0;
875 if(tx_rate < RATE_LOWER_THRESHOLD && net_state->tx_notify == 0){
876 V3_Print("Virtio NIC: Switch TX to Guest driven mode\n");
877 enable_cb(&(net_state->tx_vq));
878 net_state->tx_notify = 1;
881 if(rx_rate > RATE_UPPER_THRESHOLD && net_state->rx_notify == 1){
882 V3_Print("Virtio NIC: Switch RX to VMM None notify mode\n");
883 net_state->rx_notify = 0;
886 if(rx_rate < RATE_LOWER_THRESHOLD && net_state->rx_notify == 0){
887 V3_Print("Virtio NIC: Switch RX to VMM notify mode\n");
888 net_state->rx_notify = 1;
891 net_state->past_us = 0;
894 profile_ms += period_us/1000;
895 if(profile_ms > 20000){
896 V3_Net_Print(1, "Virtio NIC: TX: Pkt: %lld, Bytes: %lld\n\t\tRX Pkt: %lld. Bytes: %lld\n\t\tDropped: tx %lld, rx %lld\nInterrupts: tx %d, rx %d\nTotal Exit: %lld\n",
897 net_state->stats.tx_pkts, net_state->stats.tx_bytes,
898 net_state->stats.rx_pkts, net_state->stats.rx_bytes,
899 net_state->stats.tx_dropped, net_state->stats.rx_dropped,
900 net_state->stats.tx_interrupts, net_state->stats.rx_interrupts,
901 net_state->vm->cores[0].num_exits);
906 static struct v3_timer_ops timer_ops = {
907 .update_timer = virtio_nic_timer,
911 static int connect_fn(struct v3_vm_info * info,
912 void * frontend_data,
913 struct v3_dev_net_ops * ops,
915 void * private_data) {
916 struct virtio_dev_state * virtio = (struct virtio_dev_state *)frontend_data;
917 struct virtio_net_state * net_state = (struct virtio_net_state *)V3_Malloc(sizeof(struct virtio_net_state));
920 PrintError("Cannot allocate in connect\n");
924 memset(net_state, 0, sizeof(struct virtio_net_state));
925 register_dev(virtio, net_state);
927 net_state->vm = info;
928 net_state->net_ops = ops;
929 net_state->backend_data = private_data;
930 net_state->virtio_dev = virtio;
932 net_state->tx_notify = 1;
933 net_state->rx_notify = 1;
935 //net_state->timer = v3_add_timer(&(info->cores[0]), &timer_ops,net_state);
937 ops->recv = virtio_rx;
938 ops->poll = virtio_poll;
939 ops->config.frontend_data = net_state;
940 ops->config.poll = 1;
941 ops->config.quote = 64;
942 ops->config.fnt_mac = V3_Malloc(ETH_ALEN);
943 memcpy(ops->config.fnt_mac, virtio->mac, ETH_ALEN);
948 static int virtio_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
949 struct vm_device * pci_bus = v3_find_dev(vm, v3_cfg_val(cfg, "bus"));
950 struct virtio_dev_state * virtio_state = NULL;
951 char * dev_id = v3_cfg_val(cfg, "ID");
953 char * str = v3_cfg_val(cfg, "mac");
954 memcpy(macstr, str, strlen(str));
956 if (pci_bus == NULL) {
957 PrintError("Virtio NIC: Virtio device require a PCI Bus");
961 virtio_state = (struct virtio_dev_state *)V3_Malloc(sizeof(struct virtio_dev_state));
964 PrintError("Cannot allocate in init\n");
968 memset(virtio_state, 0, sizeof(struct virtio_dev_state));
970 INIT_LIST_HEAD(&(virtio_state->dev_list));
971 virtio_state->pci_bus = pci_bus;
972 virtio_state->vm = vm;
974 if (macstr != NULL && !str2mac(macstr, virtio_state->mac)) {
975 PrintDebug("Virtio NIC: Mac specified %s\n", macstr);
977 random_ethaddr(virtio_state->mac);
980 struct vm_device * dev = v3_add_device(vm, dev_id, &dev_ops, virtio_state);
983 PrintError("Virtio NIC: Could not attach device %s\n", dev_id);
984 V3_Free(virtio_state);
988 if (v3_dev_add_net_frontend(vm, dev_id, connect_fn, (void *)virtio_state) == -1) {
989 PrintError("Virtio NIC: Could not register %s as net frontend\n", dev_id);
990 v3_remove_device(dev);
997 device_register("LNX_VIRTIO_NIC", virtio_init)