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, struct virtio_vnet_state * vnet_state) {
 129     struct virtio_queue * q = &(vnet_state->queue[0]);
 130
 131     PrintDebug("VNET Bridge: Handling command  queue\n");
 132
 133     while (q->cur_avail_idx != q->avail->index) {
 134         struct vring_desc * hdr_desc = NULL;
 135         struct vring_desc * buf_desc = NULL;
 136         struct vring_desc * status_desc = NULL;
 137         uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
 138         uint16_t desc_cnt = get_desc_count(q, desc_idx);
 139         struct vnet_ctrl_hdr * hdr = NULL;
 140         int i;
 141         int xfer_len = 0;
 142         uint8_t * status_ptr = NULL;
 143         uint8_t status = 0;
 144
 145
 146         PrintDebug("VNET Bridge: CMD: Descriptor Count=%d, index=%d, desc_idx=%d\n", desc_cnt, q->cur_avail_idx % QUEUE_SIZE, desc_idx);
 147
 148         if (desc_cnt < 3) {
 149             PrintError("VNET Bridge cmd must include at least 3 descriptors (cnt=%d)\n", desc_cnt);
 150             return -1;
 151         }
 152
 153         hdr_desc = &(q->desc[desc_idx]);
 154
 155         if (v3_gpa_to_hva(core, hdr_desc->addr_gpa, (addr_t *)&hdr) == -1) {
 156             PrintError("Could not translate VirtioVNET header address\n");
 157             return -1;
 158         }
 159
 160         desc_idx = hdr_desc->next;
 161
 162         if (hdr->cmd_type == VNET_ADD_ROUTE) {
 163
 164             for (i = 0; i < hdr->num_cmds; i++) {
 165                 uint8_t tmp_status = 0;
 166                 struct v3_vnet_route * route = NULL;
 167
 168                 buf_desc = &(q->desc[desc_idx]);
 169
 170                 if (v3_gpa_to_hva(core, buf_desc->addr_gpa, (addr_t *)&(route)) == -1) {
 171                     PrintError("Could not translate route address\n");
 172                     return -1;
 173                 }
 174
 175                 // add route
 176                 PrintDebug("VNET Bridge: Adding VNET Route\n");
 177
 178                 tmp_status = v3_vnet_add_route(*route);
 179
 180                 PrintDebug("VNET Route Added\n");
 181
 182                 if (tmp_status != 0) {
 183                     PrintError("Error adding VNET ROUTE\n");
 184                     status = tmp_status;
 185                 }
 186
 187                 xfer_len += buf_desc->length;
 188                 desc_idx = buf_desc->next;
 189             }
 190
 191         }
 192
 193
 194
 195         status_desc = &(q->desc[desc_idx]);
 196
 197         if (v3_gpa_to_hva(core, status_desc->addr_gpa, (addr_t *)&status_ptr) == -1) {
 198             PrintError("VirtioVNET Error could not translate status address\n");
 199             return -1;
 200         }
 201
 202         xfer_len += status_desc->length;
 203         *status_ptr = status;
 204
 205         PrintDebug("Transferred %d bytes (xfer_len)\n", xfer_len);
 206         q->used->ring[q->used->index % QUEUE_SIZE].id = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
 207         q->used->ring[q->used->index % QUEUE_SIZE].length = xfer_len; // set to total inbound xfer length
 208
 209         q->used->index++;
 210         q->cur_avail_idx++;
 211     }
 212
 213
 214     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 215         PrintDebug("Raising IRQ %d\n",  vnet_state->pci_dev->config_header.intr_line);
 216         v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 217         vnet_state->virtio_cfg.pci_isr = 1;
 218     }
 219
 220
 221     return 0;
 222 }
 223
 224
 225 static int vnet_pkt_input_cb(struct v3_vm_info * vm,  struct v3_vnet_pkt vnet_pkts[], uint16_t pkt_num, void * private_data){
 226     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 227     struct virtio_queue * q = &(vnet_state->queue[RECV_QUEUE]);
 228     int ret_val = -1;
 229     unsigned long flags;
 230     uint16_t sent;
 231     struct v3_vnet_pkt *pkt;
 232
 233     if(pkt_num <= 0)
 234         return 0;
 235
 236     flags = v3_lock_irqsave(vnet_state->lock);
 237
 238     if (q->ring_avail_addr == 0) {
 239         PrintError("Queue is not set\n");
 240         goto exit;
 241     }
 242
 243     PrintDebug("VNET Bridge: RX: running on cpu: %d, num of pkts: %d\n", V3_Get_CPU(), pkt_num);
 244
 245     for(sent = 0; sent < pkt_num; sent ++) {
 246         pkt = &vnet_pkts[sent];
 247         vnet_state->pkt_recv ++;
 248
 249         if (q->cur_avail_idx != q->avail->index) {
 250             uint16_t pkt_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
 251             struct vring_desc * pkt_desc = NULL;
 252             struct vnet_bridge_pkt * virtio_pkt = NULL;
 253
 254             pkt_desc = &(q->desc[pkt_idx]);
 255             PrintDebug("VNET Bridge RX: buffer desc len: %d\n", pkt_desc->length);
 256
 257             if (v3_gpa_to_hva(&(vm->cores[0]), pkt_desc->addr_gpa, (addr_t *)&(virtio_pkt)) == -1) {
 258                 PrintError("Could not translate buffer address\n");
 259                 goto exit;
 260             }
 261
 262             PrintDebug("VNET Bridge: RX: pkt sent to guest pkt size: %d, dst link: %d\n", pkt->size, pkt->dst_id);
 263
 264             // Fill in dst packet buffer
 265             virtio_pkt->link_id = pkt->dst_id;
 266             virtio_pkt->pkt_size = pkt->size;
 267             memcpy(virtio_pkt->pkt, pkt->data, pkt->size);
 268
 269             q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
 270             q->used->ring[q->used->index % q->queue_size].length = sizeof(struct vnet_bridge_pkt);
 271
 272             q->used->index++;
 273             q->cur_avail_idx++;
 274         } else {
 275             vnet_state->pkt_drop ++;
 276             v3_vnet_disable_bridge();
 277         }
 278     }
 279
 280     if(sent == 0){
 281         goto exit;
 282     }
 283
 284     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 285         v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 286         vnet_state->virtio_cfg.pci_isr = 0x1;
 287         PrintDebug("Raising IRQ %d\n",  vnet_state->pci_dev->config_header.intr_line);
 288     }
 289
 290     ret_val = 0;
 291
 292
 293 #ifdef CONFIG_VNET_PROFILE
 294     if (vnet_state->pkt_recv % 200000 == 0)
 295         PrintError("Vnet Bridge: sent: %ld, rxed: %ld, dropped: %ld, total exit: %ld, tx exit: %ld, rx exit: %ld\n",
 296                         vnet_state->pkt_sent,
 297                         vnet_state->pkt_recv,
 298                         vnet_state->pkt_drop,
 299                         vnet_state->total_exit,
 300                         vnet_state->tx_exit,
 301                         vnet_state->rx_exit);
 302 #endif
 303
 304 exit:
 305
 306     v3_unlock_irqrestore(vnet_state->lock, flags);
 307
 308     return ret_val;
 309 }
 310
 311 static void vnet_pkt_input_xcall(void *data){
 312     struct v3_vnet_bridge_input_args *args = (struct v3_vnet_bridge_input_args *)data;
 313
 314     vnet_pkt_input_cb(args->vm, args->vnet_pkts, args->pkt_num, args->private_data);
 315 }
 316
 317 static int handle_pkt_kick(struct guest_info *core, struct virtio_vnet_state * vnet_state)
 318 {
 319     struct virtio_queue * q = &(vnet_state->queue[XMIT_QUEUE]);
 320     unsigned long flags = 0;
 321     int recvd = 0;
 322
 323     flags = v3_lock_irqsave(vnet_state->lock);
 324
 325     if (q->ring_avail_addr == 0) {
 326         goto exit;
 327     }
 328
 329     while (q->cur_avail_idx != q->avail->index) {
 330         uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
 331         struct vring_desc * pkt_desc = NULL;
 332         struct vnet_bridge_pkt * virtio_pkt = NULL;
 333
 334         pkt_desc = &(q->desc[desc_idx]);
 335
 336         PrintDebug("VNET Bridge: Handle TX desc buf_len: %d\n", pkt_desc->length);
 337
 338         if (v3_gpa_to_hva(core, pkt_desc->addr_gpa, (addr_t *)&(virtio_pkt)) == -1) {
 339             PrintError("Could not translate buffer address\n");
 340             return -1;
 341         }
 342
 343         PrintDebug("VNET Bridge: TX: on cpu %d pkt size: %d, dst link: %d\n", cpu, virtio_pkt->pkt_size, virtio_pkt->link_id);
 344
 345         v3_vnet_rx(virtio_pkt->pkt, virtio_pkt->pkt_size, virtio_pkt->link_id, LINK_EDGE);
 346
 347         q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
 348         q->used->ring[q->used->index % q->queue_size].length = pkt_desc->length; // What do we set this to????
 349         q->used->index++;
 350
 351         vnet_state->pkt_sent ++;
 352         recvd ++;
 353
 354         q->cur_avail_idx++;
 355     }
 356
 357     if(recvd == 0){
 358         goto exit;
 359     }
 360
 361     //PrintError("In polling get %d\n", recvd);
 362
 363     //if on the dom0 core, interrupt the domU core to poll pkts
 364     //otherwise, call the polling directly
 365     int cpu = V3_Get_CPU();
 366     if(vnet_state->vm->cores[0].cpu_id == cpu){
 367         cpu = (cpu == 0)?1:0;
 368         v3_interrupt_cpu(vnet_state->vm, cpu, V3_VNET_POLLING_VECTOR);
 369     }else{
 370         v3_vnet_polling();
 371     }
 372
 373     if((vnet_state->pkt_sent % (QUEUE_SIZE/20)) == 0) { //optimized for guest's, batch the interrupts
 374             if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 375                 v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 376                 vnet_state->virtio_cfg.pci_isr = 0x1;
 377             }
 378     }
 379
 380 #ifdef CONFIG_VNET_PROFILE
 381     if (vnet_state->pkt_sent % 200000 == 0)
 382         PrintError("Vnet Bridge: sent: %ld, rxed: %ld, dropped: %ld, total exit: %ld, tx exit: %ld, rx exit: %ld\n",
 383                         vnet_state->pkt_sent,
 384                         vnet_state->pkt_recv,
 385                         vnet_state->pkt_drop,
 386                         vnet_state->total_exit,
 387                         vnet_state->tx_exit,
 388                         vnet_state->rx_exit);
 389 #endif
 390
 391 exit:
 392     v3_unlock_irqrestore(vnet_state->lock,flags);
 393
 394     return 0;
 395 }
 396
 397 static int polling_pkt_from_guest(struct v3_vm_info * vm, void *private_data){
 398     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 399
 400     return handle_pkt_kick(&(vm->cores[0]), vnet_state);
 401 }
 402
 403 static int handle_rx_kick(struct guest_info *core, struct virtio_vnet_state * vnet_state)
 404 {
 405     v3_vnet_enable_bridge();
 406
 407     return 0;
 408 }
 409
 410 static int vnet_virtio_io_write(struct guest_info * core, uint16_t port, void * src, uint_t length, void * private_data) {
 411     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 412     int port_idx = port % vnet_state->io_range_size;
 413
 414     PrintDebug("VNET Bridge: VIRTIO VNET Write for port %d len=%d, value=%x\n",
 415                port, length, *(uint32_t *)src);
 416     PrintDebug("VNET Bridge: port idx=%d\n", port_idx);
 417
 418     vnet_state->total_exit ++;
 419
 420     switch (port_idx) {
 421         case GUEST_FEATURES_PORT:
 422             if (length != 4) {
 423                 PrintError("Illegal write length for guest features\n");
 424                 return -1;
 425             }
 426             vnet_state->virtio_cfg.guest_features = *(uint32_t *)src;
 427
 428             break;
 429         case VRING_PG_NUM_PORT:
 430             if (length == 4) {
 431                 addr_t pfn = *(uint32_t *)src;
 432                 addr_t page_addr = (pfn << VIRTIO_PAGE_SHIFT);
 433
 434                 vnet_state->cur_queue->pfn = pfn;
 435
 436                 vnet_state->cur_queue->ring_desc_addr = page_addr ;
 437                 vnet_state->cur_queue->ring_avail_addr = page_addr + (QUEUE_SIZE * sizeof(struct vring_desc));
 438                 vnet_state->cur_queue->ring_used_addr = ( vnet_state->cur_queue->ring_avail_addr + \
 439                                                  sizeof(struct vring_avail)    + \
 440                                                  (QUEUE_SIZE * sizeof(uint16_t)));
 441
 442                 // round up to next page boundary.
 443                 vnet_state->cur_queue->ring_used_addr = (vnet_state->cur_queue->ring_used_addr + 0xfff) & ~0xfff;
 444
 445                 if (v3_gpa_to_hva(core, vnet_state->cur_queue->ring_desc_addr, (addr_t *)&(vnet_state->cur_queue->desc)) == -1) {
 446                     PrintError("Could not translate ring descriptor address\n");
 447                     return -1;
 448                 }
 449
 450                 if (v3_gpa_to_hva(core, vnet_state->cur_queue->ring_avail_addr, (addr_t *)&(vnet_state->cur_queue->avail)) == -1) {
 451                     PrintError("Could not translate ring available address\n");
 452                     return -1;
 453                 }
 454
 455                 if (v3_gpa_to_hva(core, vnet_state->cur_queue->ring_used_addr, (addr_t *)&(vnet_state->cur_queue->used)) == -1) {
 456                     PrintError("Could not translate ring used address\n");
 457                     return -1;
 458                 }
 459
 460                 PrintDebug("VNET Bridge: RingDesc_addr=%p, Avail_addr=%p, Used_addr=%p\n",
 461                            (void *)(vnet_state->cur_queue->ring_desc_addr),
 462                            (void *)(vnet_state->cur_queue->ring_avail_addr),
 463                            (void *)(vnet_state->cur_queue->ring_used_addr));
 464
 465                 PrintDebug("VNET Bridge: RingDesc=%p, Avail=%p, Used=%p\n",
 466                            vnet_state->cur_queue->desc, vnet_state->cur_queue->avail, vnet_state->cur_queue->used);
 467
 468                 if(vnet_state->queue[RECV_QUEUE].avail != NULL){
 469                     vnet_state->ready = 1;
 470                 }
 471
 472                 //No notify when there is pkt tx from guest
 473                 if(vnet_state->queue[XMIT_QUEUE].used != NULL){
 474                     vnet_state->queue[XMIT_QUEUE].used->flags |= VRING_NO_NOTIFY_FLAG;
 475                 }
 476
 477             } else {
 478                 PrintError("Illegal write length for page frame number\n");
 479                 return -1;
 480             }
 481             break;
 482         case VRING_Q_SEL_PORT:
 483             vnet_state->virtio_cfg.vring_queue_selector = *(uint16_t *)src;
 484
 485             if (vnet_state->virtio_cfg.vring_queue_selector > NUM_QUEUES) {
 486                 PrintError("VNET Bridge device has no qeueues. Selected %d\n",
 487                            vnet_state->virtio_cfg.vring_queue_selector);
 488                 return -1;
 489             }
 490
 491             vnet_state->cur_queue = &(vnet_state->queue[vnet_state->virtio_cfg.vring_queue_selector]);
 492
 493             break;
 494         case VRING_Q_NOTIFY_PORT: {
 495             uint16_t queue_idx = *(uint16_t *)src;
 496
 497             PrintDebug("VNET Bridge: Handling Kick\n");
 498
 499             if (queue_idx == 0) {
 500                 if (handle_cmd_kick(core, vnet_state) == -1) {
 501                     PrintError("Could not handle Virtio VNET Control command\n");
 502                     return -1;
 503                 }
 504             } else if (queue_idx == 1) {
 505                 if (handle_pkt_kick(core, vnet_state) == -1){
 506                     PrintError("Could not handle Virtio VNET TX\n");
 507                     return -1;
 508                 }
 509                 vnet_state->tx_exit ++;
 510                 //PrintError("Notify on TX\n");
 511             } else if (queue_idx == 2) {
 512                 if (handle_rx_kick(core, vnet_state) == -1){
 513                     PrintError("Could not handle Virtio RX buffer refills Kick\n");
 514                     return -1;
 515                 }
 516                 vnet_state->rx_exit ++;
 517             } else {
 518                 PrintError("VNET Bridge: Kick on invalid queue (%d)\n", queue_idx);
 519                 return -1;
 520             }
 521
 522             break;
 523         }
 524         case VIRTIO_STATUS_PORT:
 525             vnet_state->virtio_cfg.status = *(uint8_t *)src;
 526
 527             if (vnet_state->virtio_cfg.status == 0) {
 528                 PrintDebug("VNET Bridge: Resetting device\n");
 529                 virtio_reset(vnet_state);
 530             }
 531
 532             break;
 533
 534         case VIRTIO_ISR_PORT:
 535             vnet_state->virtio_cfg.pci_isr = *(uint8_t *)src;
 536             break;
 537         default:
 538             return -1;
 539             break;
 540     }
 541
 542     return length;
 543 }
 544
 545
 546 static int vnet_virtio_io_read(struct guest_info * core, uint16_t port, void * dst, uint_t length, void * private_data) {
 547
 548     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 549     int port_idx = port % vnet_state->io_range_size;
 550
 551     switch (port_idx) {
 552         case HOST_FEATURES_PORT:
 553             if (length != 4) {
 554                 PrintError("Illegal read length for host features\n");
 555                 return -1;
 556             }
 557
 558             *(uint32_t *)dst = vnet_state->virtio_cfg.host_features;
 559
 560             break;
 561         case VRING_PG_NUM_PORT:
 562             if (length != 4) {
 563                 PrintError("Illegal read length for page frame number\n");
 564                 return -1;
 565             }
 566
 567             *(uint32_t *)dst = vnet_state->cur_queue->pfn;
 568
 569             break;
 570         case VRING_SIZE_PORT:
 571             if (length != 2) {
 572                 PrintError("Illegal read length for vring size\n");
 573                 return -1;
 574             }
 575
 576             *(uint16_t *)dst = vnet_state->cur_queue->queue_size;
 577
 578             break;
 579
 580         case VIRTIO_STATUS_PORT:
 581             if (length != 1) {
 582                 PrintError("Illegal read length for status\n");
 583                 return -1;
 584             }
 585
 586             *(uint8_t *)dst = vnet_state->virtio_cfg.status;
 587             break;
 588
 589         case VIRTIO_ISR_PORT:
 590             *(uint8_t *)dst = vnet_state->virtio_cfg.pci_isr;
 591             vnet_state->virtio_cfg.pci_isr = 0;
 592             v3_pci_lower_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 593             break;
 594
 595         default:
 596             if ( (port_idx >= sizeof(struct virtio_config)) &&
 597                  (port_idx < (sizeof(struct virtio_config) + sizeof(struct vnet_config))) ) {
 598                 int cfg_offset = port_idx - sizeof(struct virtio_config);
 599                 uint8_t * cfg_ptr = (uint8_t *)&(vnet_state->vnet_cfg);
 600
 601                 memcpy(dst, cfg_ptr + cfg_offset, length);
 602
 603             } else {
 604                 PrintError("Read of Unhandled Virtio Read\n");
 605                 return -1;
 606             }
 607
 608             break;
 609     }
 610
 611     return length;
 612 }
 613
 614
 615
 616 static struct v3_device_ops dev_ops = {
 617     .free = NULL,
 618     .reset = NULL,
 619     .start = NULL,
 620     .stop = NULL,
 621 };
 622
 623 static int dev_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
 624     struct vm_device * pci_bus = v3_find_dev(vm, v3_cfg_val(cfg, "bus"));
 625     struct virtio_vnet_state * vnet_state = NULL;
 626     struct pci_device * pci_dev = NULL;
 627     char * name = v3_cfg_val(cfg, "name");
 628
 629     PrintDebug("VNET Bridge: Initializing VNET Bridge Control device: %s\n", name);
 630
 631     if (pci_bus == NULL) {
 632         PrintError("VNET Bridge device require a PCI Bus");
 633         return -1;
 634     }
 635
 636     vnet_state  = (struct virtio_vnet_state *)V3_Malloc(sizeof(struct virtio_vnet_state));
 637     memset(vnet_state, 0, sizeof(struct virtio_vnet_state));
 638
 639     vnet_state->vm = vm;
 640
 641     struct vm_device * dev = v3_allocate_device(name, &dev_ops, vnet_state);
 642
 643     if (v3_attach_device(vm, dev) == -1) {
 644         PrintError("Could not attach device %s\n", name);
 645         return -1;
 646     }
 647
 648
 649     // PCI initialization
 650     {
 651         struct v3_pci_bar bars[6];
 652         int num_ports = sizeof(struct virtio_config) + sizeof(struct vnet_config);
 653         int tmp_ports = num_ports;
 654         int i;
 655
 656         // This gets the number of ports, rounded up to a power of 2
 657         vnet_state->io_range_size = 1; // must be a power of 2
 658
 659         while (tmp_ports > 0) {
 660             tmp_ports >>= 1;
 661             vnet_state->io_range_size <<= 1;
 662         }
 663
 664         // this is to account for any low order bits being set in num_ports
 665         // if there are none, then num_ports was already a power of 2 so we shift right to reset it
 666         if ((num_ports & ((vnet_state->io_range_size >> 1) - 1)) == 0) {
 667             vnet_state->io_range_size >>= 1;
 668         }
 669
 670         for (i = 0; i < 6; i++) {
 671             bars[i].type = PCI_BAR_NONE;
 672         }
 673
 674         bars[0].type = PCI_BAR_IO;
 675         bars[0].default_base_port = -1;
 676         bars[0].num_ports = vnet_state->io_range_size;
 677         bars[0].io_read = vnet_virtio_io_read;
 678         bars[0].io_write = vnet_virtio_io_write;
 679         bars[0].private_data = vnet_state;
 680
 681         pci_dev = v3_pci_register_device(pci_bus, PCI_STD_DEVICE,
 682                                          0, PCI_AUTO_DEV_NUM, 0,
 683                                          "LNX_VIRTIO_VNET", bars,
 684                                          NULL, NULL, NULL, vnet_state);
 685
 686         if (!pci_dev) {
 687             PrintError("Could not register PCI Device\n");
 688             return -1;
 689         }
 690
 691         pci_dev->config_header.vendor_id = VIRTIO_VENDOR_ID;
 692         pci_dev->config_header.subsystem_vendor_id = VIRTIO_SUBVENDOR_ID;
 693         pci_dev->config_header.device_id = VIRTIO_VNET_DEV_ID;
 694         pci_dev->config_header.class = PCI_CLASS_MEMORY;
 695         pci_dev->config_header.subclass = PCI_MEM_SUBCLASS_RAM;
 696         pci_dev->config_header.subsystem_id = VIRTIO_VNET_SUBDEVICE_ID;
 697         pci_dev->config_header.intr_pin = 1;
 698         pci_dev->config_header.max_latency = 1; // ?? (qemu does it...)
 699
 700
 701         vnet_state->pci_dev = pci_dev;
 702         vnet_state->pci_bus = pci_bus;
 703     }
 704
 705     virtio_reset(vnet_state);
 706
 707     V3_Print("Registering Virtio device as vnet bridge\n");
 708     v3_vnet_add_bridge(vm, vnet_pkt_input_cb, vnet_pkt_input_xcall, polling_pkt_from_guest, 0, 500000, (void *)vnet_state);
 709
 710
 711     return 0;
 712 }
 713
 714
 715 device_register("LNX_VIRTIO_VNET", dev_init)