palacios/src/devices/lnx_virtio_vnet.c

   1 /*
   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.
   5  *
   6  * The V3VEE Project is a joint project between Northwestern University
   7  * and the University of New Mexico.  You can find out more at
   8  * http://www.v3vee.org
   9  *
  10  * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
  11  * Copyright (c) 2008, Lei Xia <lxia@cs.northwestern.edu>
  12  * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
  13  * All rights reserved.
  14  *
  15  * Author: Jack Lange <jarusl@cs.northwestern.edu>
  16  *             Lei Xia <lxia@cs.northwestern.edu>
  17  *
  18  * This is free software.  You are permitted to use,
  19  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
  20  */
  21
  22 #include <palacios/vmm.h>
  23 #include <palacios/vmm_dev_mgr.h>
  24 #include <palacios/vm_guest_mem.h>
  25 #include <devices/lnx_virtio_pci.h>
  26 #include <palacios/vmm_vnet.h>
  27 #include <palacios/vmm_sprintf.h>
  28 #include <devices/pci.h>
  29
  30
  31 #ifndef CONFIG_DEBUG_LINUX_VIRTIO_VNET
  32 #undef PrintDebug
  33 #define PrintDebug(fmt, args...)
  34 #endif
  35
  36
  37 #define QUEUE_SIZE 4096
  38 #define CMD_QUEUE_SIZE 128
  39 #define NUM_QUEUES 3
  40
  41 struct vnet_config {
  42     uint32_t num_devs;
  43     uint32_t num_routes;
  44 } __attribute__((packed));
  45
  46
  47 #define CTRL_QUEUE 0
  48 #define XMIT_QUEUE 1
  49 #define RECV_QUEUE 2
  50
  51 struct virtio_vnet_state {
  52     struct v3_vm_info * vm;
  53     struct vnet_config vnet_cfg;
  54     struct virtio_config virtio_cfg;
  55
  56     struct vm_device * pci_bus;
  57     struct pci_device * pci_dev;
  58
  59     struct virtio_queue queue[NUM_QUEUES];
  60
  61     struct virtio_queue * cur_queue;
  62
  63     int io_range_size;
  64     v3_lock_t lock;
  65
  66     ulong_t pkt_sent, pkt_recv, pkt_drop, tx_exit, rx_exit, total_exit;
  67     int ready;
  68 };
  69
  70 #define VNET_GET_ROUTES 10
  71 #define VNET_ADD_ROUTE 11
  72 #define VNET_DEL_ROUTE 12
  73
  74 #define VNET_GET_LINKS 20
  75 #define VNET_ADD_LINK 21
  76 #define VNET_DEL_LINK 22
  77
  78 // structure of the vnet command header
  79 struct vnet_ctrl_hdr {
  80     uint8_t cmd_type;
  81     uint32_t num_cmds;
  82 } __attribute__((packed));
  83
  84
  85 struct vnet_bridge_pkt {
  86     uint32_t link_id;
  87     uint32_t pkt_size;
  88     uint8_t pkt[ETHERNET_PACKET_LEN];
  89 }__attribute__((packed));
  90
  91
  92 static int virtio_reset(struct virtio_vnet_state * vnet_state) {
  93
  94     memset(vnet_state->queue, 0, sizeof(struct virtio_queue) * NUM_QUEUES);
  95
  96     vnet_state->cur_queue = &(vnet_state->queue[0]);
  97
  98     vnet_state->virtio_cfg.status = 0;
  99     vnet_state->virtio_cfg.pci_isr = 0;
 100
 101     vnet_state->queue[0].queue_size = CMD_QUEUE_SIZE;
 102     vnet_state->queue[1].queue_size = QUEUE_SIZE;
 103     vnet_state->queue[2].queue_size = QUEUE_SIZE;
 104
 105     memset(&(vnet_state->vnet_cfg), 0, sizeof(struct vnet_config));
 106     v3_lock_init(&(vnet_state->lock));
 107
 108     return 0;
 109 }
 110
 111
 112
 113 static int get_desc_count(struct virtio_queue * q, int index) {
 114     struct vring_desc * tmp_desc = &(q->desc[index]);
 115     int cnt = 1;
 116
 117     while (tmp_desc->flags & VIRTIO_NEXT_FLAG) {
 118         tmp_desc = &(q->desc[tmp_desc->next]);
 119         cnt++;
 120     }
 121
 122     return cnt;
 123 }
 124
 125
 126
 127
 128 static int handle_cmd_kick(struct guest_info * core,
 129                            struct virtio_vnet_state * vnet_state) {
 130     struct virtio_queue * q = &(vnet_state->queue[0]);
 131
 132     PrintDebug("VNET Bridge: Handling command  queue\n");
 133
 134     while (q->cur_avail_idx != q->avail->index) {
 135         struct vring_desc * hdr_desc = NULL;
 136         struct vring_desc * buf_desc = NULL;
 137         struct vring_desc * status_desc = NULL;
 138         uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
 139         uint16_t desc_cnt = get_desc_count(q, desc_idx);
 140         struct vnet_ctrl_hdr * hdr = NULL;
 141         int i;
 142         int xfer_len = 0;
 143         uint8_t * status_ptr = NULL;
 144         uint8_t status = 0;
 145
 146
 147         PrintDebug("VNET Bridge: CMD: Descriptor Count=%d, index=%d, desc_idx=%d\n", desc_cnt, q->cur_avail_idx % QUEUE_SIZE, desc_idx);
 148
 149         if (desc_cnt < 3) {
 150             PrintError("VNET Bridge cmd must include at least 3 descriptors (cnt=%d)\n", desc_cnt);
 151             return -1;
 152         }
 153
 154         hdr_desc = &(q->desc[desc_idx]);
 155
 156         if (v3_gpa_to_hva(core, hdr_desc->addr_gpa, (addr_t *)&hdr) == -1) {
 157             PrintError("Could not translate VirtioVNET header address\n");
 158             return -1;
 159         }
 160
 161         desc_idx = hdr_desc->next;
 162
 163         if (hdr->cmd_type == VNET_ADD_ROUTE) {
 164
 165             for (i = 0; i < hdr->num_cmds; i++) {
 166                 uint8_t tmp_status = 0;
 167                 struct v3_vnet_route * route = NULL;
 168
 169                 buf_desc = &(q->desc[desc_idx]);
 170
 171                 if (v3_gpa_to_hva(core, buf_desc->addr_gpa, (addr_t *)&(route)) == -1) {
 172                     PrintError("Could not translate route address\n");
 173                     return -1;
 174                 }
 175
 176                 // add route
 177                 PrintDebug("VNET Bridge: Adding VNET Route\n");
 178
 179                 tmp_status = v3_vnet_add_route(*route);
 180
 181                 PrintDebug("VNET Route Added\n");
 182
 183                 if (tmp_status != 0) {
 184                     PrintError("Error adding VNET ROUTE\n");
 185                     status = tmp_status;
 186                 }
 187
 188                 xfer_len += buf_desc->length;
 189                 desc_idx = buf_desc->next;
 190             }
 191
 192         }
 193
 194
 195
 196         status_desc = &(q->desc[desc_idx]);
 197
 198         if (v3_gpa_to_hva(core, status_desc->addr_gpa, (addr_t *)&status_ptr) == -1) {
 199             PrintError("VirtioVNET Error could not translate status address\n");
 200             return -1;
 201         }
 202
 203         xfer_len += status_desc->length;
 204         *status_ptr = status;
 205
 206         PrintDebug("Transferred %d bytes (xfer_len)\n", xfer_len);
 207         q->used->ring[q->used->index % QUEUE_SIZE].id = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
 208         q->used->ring[q->used->index % QUEUE_SIZE].length = xfer_len; // set to total inbound xfer length
 209
 210         q->used->index++;
 211         q->cur_avail_idx++;
 212     }
 213
 214
 215     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 216         PrintDebug("Raising IRQ %d\n",  vnet_state->pci_dev->config_header.intr_line);
 217         v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 218         vnet_state->virtio_cfg.pci_isr = 1;
 219     }
 220
 221
 222     return 0;
 223 }
 224
 225
 226 static int vnet_pkt_input_cb(struct v3_vm_info * vm,
 227                              struct v3_vnet_pkt * pkt,
 228                              void * private_data){
 229     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 230     struct virtio_queue * q = &(vnet_state->queue[RECV_QUEUE]);
 231     int ret_val = -1;
 232     unsigned long flags;
 233
 234     flags = v3_lock_irqsave(vnet_state->lock);
 235
 236     if (q->ring_avail_addr == 0) {
 237         PrintError("Queue is not set\n");
 238         goto exit;
 239     }
 240
 241     if (q->cur_avail_idx != q->avail->index) {
 242         uint16_t pkt_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
 243         struct vring_desc * pkt_desc = NULL;
 244         struct vnet_bridge_pkt * virtio_pkt = NULL;
 245
 246         pkt_desc = &(q->desc[pkt_idx]);
 247         PrintDebug("VNET Bridge RX: buffer desc len: %d\n", pkt_desc->length);
 248
 249         if (v3_gpa_to_hva(&(vm->cores[0]), pkt_desc->addr_gpa, (addr_t *)&(virtio_pkt)) == -1) {
 250             PrintError("Could not translate buffer address\n");
 251             goto exit;
 252         }
 253
 254         PrintDebug("VNET Bridge: RX: pkt sent to guest pkt size: %d, dst link: %d\n", pkt->size, pkt->dst_id);
 255
 256         // Fill in dst packet buffer
 257         virtio_pkt->link_id = pkt->dst_id;
 258         virtio_pkt->pkt_size = pkt->size;
 259         memcpy(virtio_pkt->pkt, pkt->data, pkt->size);
 260
 261         q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
 262         q->used->ring[q->used->index % q->queue_size].length = sizeof(struct vnet_bridge_pkt);
 263
 264         q->used->index++;
 265         q->cur_avail_idx++;
 266     } else {
 267         vnet_state->pkt_drop ++;
 268     }
 269
 270     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 271         v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 272         vnet_state->virtio_cfg.pci_isr = 0x1;
 273         PrintDebug("Raising IRQ %d\n",  vnet_state->pci_dev->config_header.intr_line);
 274     }
 275
 276     ret_val = 0;
 277
 278 exit:
 279
 280     v3_unlock_irqrestore(vnet_state->lock, flags);
 281
 282     return ret_val;
 283 }
 284
 285 static int handle_pkt_kick(struct guest_info * core,
 286                            struct virtio_vnet_state * vnet_state)
 287 {
 288     struct virtio_queue * q = &(vnet_state->queue[XMIT_QUEUE]);
 289     int recvd = 0;
 290
 291     if (q->ring_avail_addr == 0) {
 292         return -1;
 293     }
 294
 295     while (q->cur_avail_idx != q->avail->index) {
 296         uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
 297         struct vring_desc * pkt_desc = NULL;
 298         struct vnet_bridge_pkt * virtio_pkt = NULL;
 299
 300         pkt_desc = &(q->desc[desc_idx]);
 301
 302         PrintDebug("VNET Bridge: Handle TX desc buf_len: %d\n", pkt_desc->length);
 303
 304         if (v3_gpa_to_hva(core, pkt_desc->addr_gpa, (addr_t *)&(virtio_pkt)) == -1) {
 305             PrintError("Could not translate buffer address\n");
 306             return -1;
 307         }
 308
 309         //PrintDebug("VNET Bridge: TX: on cpu %d pkt size: %d, dst link: %d\n", cpu, virtio_pkt->pkt_size, virtio_pkt->link_id);
 310
 311         struct v3_vnet_pkt pkt;
 312         pkt.size = virtio_pkt->pkt_size;
 313         pkt.src_type = LINK_EDGE;
 314         pkt.src_id = 0;
 315         memcpy(pkt.header, virtio_pkt->pkt, ETHERNET_HEADER_LEN);
 316         pkt.data = virtio_pkt->pkt;
 317
 318         v3_vnet_send_pkt(&pkt, NULL);
 319
 320         q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
 321         q->used->ring[q->used->index % q->queue_size].length = pkt_desc->length; // What do we set this to????
 322         q->used->index++;
 323
 324         vnet_state->pkt_sent ++;
 325         recvd ++;
 326
 327         q->cur_avail_idx++;
 328     }
 329
 330     if(recvd == 0){
 331         return 0;
 332     }
 333
 334     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 335             v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 336             vnet_state->virtio_cfg.pci_isr = 0x1;
 337     }
 338
 339     return 0;
 340 }
 341
 342 static void vnet_virtio_poll(struct v3_vm_info * vm, void * private_data){
 343     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 344
 345     if(vm == vnet_state->vm){
 346         handle_pkt_kick(&(vm->cores[0]), vnet_state);
 347     }
 348 }
 349
 350 static int handle_rx_kick(struct guest_info *core,
 351                           struct virtio_vnet_state * vnet_state)
 352 {
 353     //v3_vnet_enable_bridge();
 354
 355     return 0;
 356 }
 357
 358 static int vnet_virtio_io_write(struct guest_info * core,
 359                                 uint16_t port, void * src,
 360                                 uint_t length, void * private_data) {
 361     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 362     int port_idx = port % vnet_state->io_range_size;
 363
 364     PrintDebug("VNET Bridge: VIRTIO VNET Write for port %d len=%d, value=%x\n",
 365                port, length, *(uint32_t *)src);
 366
 367     vnet_state->total_exit ++;
 368     switch (port_idx) {
 369         case GUEST_FEATURES_PORT:
 370             if (length != 4) {
 371                 PrintError("Illegal write length for guest features\n");
 372                 return -1;
 373             }
 374             vnet_state->virtio_cfg.guest_features = *(uint32_t *)src;
 375
 376             break;
 377         case VRING_PG_NUM_PORT:
 378             if (length == 4) {
 379                 addr_t pfn = *(uint32_t *)src;
 380                 addr_t page_addr = (pfn << VIRTIO_PAGE_SHIFT);
 381
 382                 vnet_state->cur_queue->pfn = pfn;
 383
 384                 vnet_state->cur_queue->ring_desc_addr = page_addr ;
 385                 vnet_state->cur_queue->ring_avail_addr = page_addr + (QUEUE_SIZE * sizeof(struct vring_desc));
 386                 vnet_state->cur_queue->ring_used_addr = ( vnet_state->cur_queue->ring_avail_addr + \
 387                                                  sizeof(struct vring_avail)    + \
 388                                                  (QUEUE_SIZE * sizeof(uint16_t)));
 389
 390                 // round up to next page boundary.
 391                 vnet_state->cur_queue->ring_used_addr = (vnet_state->cur_queue->ring_used_addr + 0xfff) & ~0xfff;
 392
 393                 if (v3_gpa_to_hva(core, vnet_state->cur_queue->ring_desc_addr, (addr_t *)&(vnet_state->cur_queue->desc)) == -1) {
 394                     PrintError("Could not translate ring descriptor address\n");
 395                     return -1;
 396                 }
 397
 398                 if (v3_gpa_to_hva(core, vnet_state->cur_queue->ring_avail_addr, (addr_t *)&(vnet_state->cur_queue->avail)) == -1) {
 399                     PrintError("Could not translate ring available address\n");
 400                     return -1;
 401                 }
 402
 403                 if (v3_gpa_to_hva(core, vnet_state->cur_queue->ring_used_addr, (addr_t *)&(vnet_state->cur_queue->used)) == -1) {
 404                     PrintError("Could not translate ring used address\n");
 405                     return -1;
 406                 }
 407
 408                 PrintDebug("VNET Bridge: RingDesc_addr=%p, Avail_addr=%p, Used_addr=%p\n",
 409                            (void *)(vnet_state->cur_queue->ring_desc_addr),
 410                            (void *)(vnet_state->cur_queue->ring_avail_addr),
 411                            (void *)(vnet_state->cur_queue->ring_used_addr));
 412
 413                 PrintDebug("VNET Bridge: RingDesc=%p, Avail=%p, Used=%p\n",
 414                            vnet_state->cur_queue->desc, vnet_state->cur_queue->avail, vnet_state->cur_queue->used);
 415
 416                 if(vnet_state->queue[RECV_QUEUE].avail != NULL){
 417                     vnet_state->ready = 1;
 418                     vnet_state->queue[RECV_QUEUE].used->flags |= VRING_NO_NOTIFY_FLAG;
 419                 }
 420
 421                 //No notify when there is pkt tx from guest
 422                 //palacios will do the polling
 423                 if(vnet_state->queue[XMIT_QUEUE].used != NULL){
 424                     vnet_state->queue[XMIT_QUEUE].used->flags |= VRING_NO_NOTIFY_FLAG;
 425                 }
 426             } else {
 427                 PrintError("Illegal write length for page frame number\n");
 428                 return -1;
 429             }
 430             break;
 431         case VRING_Q_SEL_PORT:
 432             vnet_state->virtio_cfg.vring_queue_selector = *(uint16_t *)src;
 433
 434             if (vnet_state->virtio_cfg.vring_queue_selector > NUM_QUEUES) {
 435                 PrintError("VNET Bridge device has no qeueues. Selected %d\n",
 436                            vnet_state->virtio_cfg.vring_queue_selector);
 437                 return -1;
 438             }
 439
 440             vnet_state->cur_queue = &(vnet_state->queue[vnet_state->virtio_cfg.vring_queue_selector]);
 441
 442             break;
 443         case VRING_Q_NOTIFY_PORT: {
 444             uint16_t queue_idx = *(uint16_t *)src;
 445
 446             PrintDebug("VNET Bridge: Handling Kick\n");
 447
 448             if (queue_idx == 0) {
 449                 if (handle_cmd_kick(core, vnet_state) == -1) {
 450                     PrintError("Could not handle Virtio VNET Control command\n");
 451                     return -1;
 452                 }
 453             } else if (queue_idx == 1) {
 454                 if (handle_pkt_kick(core, vnet_state) == -1){
 455                     PrintError("Could not handle Virtio VNET TX\n");
 456                     return -1;
 457                 }
 458                 PrintError("Notify on TX\n");
 459             } else if (queue_idx == 2) {
 460                 if (handle_rx_kick(core, vnet_state) == -1){
 461                     PrintError("Could not handle Virtio RX buffer refills Kick\n");
 462                     return -1;
 463                 }
 464                 vnet_state->rx_exit ++;
 465             } else {
 466                 PrintError("VNET Bridge: Kick on invalid queue (%d)\n", queue_idx);
 467                 return -1;
 468             }
 469
 470             break;
 471         }
 472         case VIRTIO_STATUS_PORT:
 473             vnet_state->virtio_cfg.status = *(uint8_t *)src;
 474
 475             if (vnet_state->virtio_cfg.status == 0) {
 476                 PrintDebug("VNET Bridge: Resetting device\n");
 477                 virtio_reset(vnet_state);
 478             }
 479
 480             break;
 481
 482         case VIRTIO_ISR_PORT:
 483             vnet_state->virtio_cfg.pci_isr = *(uint8_t *)src;
 484             break;
 485         default:
 486             return -1;
 487             break;
 488     }
 489
 490     return length;
 491 }
 492
 493
 494 static int vnet_virtio_io_read(struct guest_info * core,
 495                                uint16_t port, void * dst,
 496                                uint_t length, void * private_data) {
 497
 498     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 499     int port_idx = port % vnet_state->io_range_size;
 500
 501     switch (port_idx) {
 502         case HOST_FEATURES_PORT:
 503             if (length != 4) {
 504                 PrintError("Illegal read length for host features\n");
 505                 return -1;
 506             }
 507
 508             *(uint32_t *)dst = vnet_state->virtio_cfg.host_features;
 509
 510             break;
 511         case VRING_PG_NUM_PORT:
 512             if (length != 4) {
 513                 PrintError("Illegal read length for page frame number\n");
 514                 return -1;
 515             }
 516
 517             *(uint32_t *)dst = vnet_state->cur_queue->pfn;
 518
 519             break;
 520         case VRING_SIZE_PORT:
 521             if (length != 2) {
 522                 PrintError("Illegal read length for vring size\n");
 523                 return -1;
 524             }
 525
 526             *(uint16_t *)dst = vnet_state->cur_queue->queue_size;
 527
 528             break;
 529
 530         case VIRTIO_STATUS_PORT:
 531             if (length != 1) {
 532                 PrintError("Illegal read length for status\n");
 533                 return -1;
 534             }
 535
 536             *(uint8_t *)dst = vnet_state->virtio_cfg.status;
 537             break;
 538
 539         case VIRTIO_ISR_PORT:
 540             *(uint8_t *)dst = vnet_state->virtio_cfg.pci_isr;
 541             vnet_state->virtio_cfg.pci_isr = 0;
 542             v3_pci_lower_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 543             break;
 544
 545         default:
 546             if ( (port_idx >= sizeof(struct virtio_config)) &&
 547                  (port_idx < (sizeof(struct virtio_config) + sizeof(struct vnet_config))) ) {
 548                 int cfg_offset = port_idx - sizeof(struct virtio_config);
 549                 uint8_t * cfg_ptr = (uint8_t *)&(vnet_state->vnet_cfg);
 550
 551                 memcpy(dst, cfg_ptr + cfg_offset, length);
 552
 553             } else {
 554                 PrintError("Read of Unhandled Virtio Read\n");
 555                 return -1;
 556             }
 557
 558             break;
 559     }
 560
 561     return length;
 562 }
 563
 564
 565 static int virtio_free(struct virtio_vnet_state * vnet_state) {
 566
 567     // unregister from PCI
 568
 569     V3_Free(vnet_state);
 570     return 0;
 571 }
 572
 573
 574 static struct v3_device_ops dev_ops = {
 575     .free = (int (*)(void *))virtio_free,
 576 };
 577
 578 static int dev_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
 579     struct vm_device * pci_bus = v3_find_dev(vm, v3_cfg_val(cfg, "bus"));
 580     struct virtio_vnet_state * vnet_state = NULL;
 581     struct pci_device * pci_dev = NULL;
 582     char * name = v3_cfg_val(cfg, "name");
 583
 584     PrintDebug("VNET Bridge: Initializing VNET Bridge Control device: %s\n", name);
 585
 586     if (pci_bus == NULL) {
 587         PrintError("VNET Bridge device require a PCI Bus");
 588         return -1;
 589     }
 590
 591     vnet_state  = (struct virtio_vnet_state *)V3_Malloc(sizeof(struct virtio_vnet_state));
 592     memset(vnet_state, 0, sizeof(struct virtio_vnet_state));
 593
 594     vnet_state->vm = vm;
 595
 596     struct vm_device * dev = v3_add_device(vm, name, &dev_ops, vnet_state);
 597
 598     if (dev == NULL) {
 599         PrintError("Could not attach device %s\n", name);
 600         V3_Free(vnet_state);
 601         return -1;
 602     }
 603
 604
 605     // PCI initialization
 606     {
 607         struct v3_pci_bar bars[6];
 608         int num_ports = sizeof(struct virtio_config) + sizeof(struct vnet_config);
 609         int tmp_ports = num_ports;
 610         int i;
 611
 612         // This gets the number of ports, rounded up to a power of 2
 613         vnet_state->io_range_size = 1; // must be a power of 2
 614
 615         while (tmp_ports > 0) {
 616             tmp_ports >>= 1;
 617             vnet_state->io_range_size <<= 1;
 618         }
 619
 620         // this is to account for any low order bits being set in num_ports
 621         // if there are none, then num_ports was already a power of 2 so we shift right to reset it
 622         if ((num_ports & ((vnet_state->io_range_size >> 1) - 1)) == 0) {
 623             vnet_state->io_range_size >>= 1;
 624         }
 625
 626         for (i = 0; i < 6; i++) {
 627             bars[i].type = PCI_BAR_NONE;
 628         }
 629
 630         bars[0].type = PCI_BAR_IO;
 631         bars[0].default_base_port = -1;
 632         bars[0].num_ports = vnet_state->io_range_size;
 633         bars[0].io_read = vnet_virtio_io_read;
 634         bars[0].io_write = vnet_virtio_io_write;
 635         bars[0].private_data = vnet_state;
 636
 637         pci_dev = v3_pci_register_device(pci_bus, PCI_STD_DEVICE,
 638                                          0, 5 /*PCI_AUTO_DEV_NUM*/, 0,
 639                                          "LNX_VIRTIO_VNET", bars,
 640                                          NULL, NULL, NULL, vnet_state);
 641
 642         if (!pci_dev) {
 643             PrintError("Could not register PCI Device\n");
 644             v3_remove_device(dev);
 645             return -1;
 646         }
 647
 648         pci_dev->config_header.vendor_id = VIRTIO_VENDOR_ID;
 649         pci_dev->config_header.subsystem_vendor_id = VIRTIO_SUBVENDOR_ID;
 650         pci_dev->config_header.device_id = VIRTIO_VNET_DEV_ID;
 651         pci_dev->config_header.class = PCI_CLASS_MEMORY;
 652         pci_dev->config_header.subclass = PCI_MEM_SUBCLASS_RAM;
 653         pci_dev->config_header.subsystem_id = VIRTIO_VNET_SUBDEVICE_ID;
 654         pci_dev->config_header.intr_pin = 1;
 655         pci_dev->config_header.max_latency = 1; // ?? (qemu does it...)
 656
 657
 658         vnet_state->pci_dev = pci_dev;
 659         vnet_state->pci_bus = pci_bus;
 660     }
 661
 662     virtio_reset(vnet_state);
 663
 664     struct v3_vnet_bridge_ops brg_ops;
 665     brg_ops.input = vnet_pkt_input_cb;
 666     brg_ops.poll = vnet_virtio_poll;
 667
 668     V3_Print("Registering Virtio device as vnet bridge\n");
 669
 670     v3_vnet_add_bridge(vm, &brg_ops, CTL_VM_BRIDGE, (void *)vnet_state);
 671
 672     return 0;
 673 }
 674
 675
 676 device_register("LNX_VIRTIO_VNET", dev_init)