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 8192
  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;
  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 (guest_pa_to_host_va(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 (guest_pa_to_host_va(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 (guest_pa_to_host_va(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             //if(q->cur_avail_idx % 100 == 0)
 255                // PrintError("cur_avai_idx %d, idx: %d\n", q->cur_avail_idx, q->avail->index);
 256
 257             pkt_desc = &(q->desc[pkt_idx]);
 258             PrintDebug("VNET Bridge RX: buffer desc len: %d\n", pkt_desc->length);
 259
 260             if (guest_pa_to_host_va(&(vm->cores[0]), pkt_desc->addr_gpa, (addr_t *)&(virtio_pkt)) == -1) {
 261                 PrintError("Could not translate buffer address\n");
 262                 goto exit;
 263             }
 264
 265             PrintDebug("VNET Bridge: RX: pkt sent to guest pkt size: %d, dst link: %d\n", pkt->size, pkt->dst_id);
 266
 267             // Fill in dst packet buffer
 268             virtio_pkt->link_id = pkt->dst_id;
 269             virtio_pkt->pkt_size = pkt->size;
 270             memcpy(virtio_pkt->pkt, pkt->data, pkt->size);
 271
 272             q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
 273             q->used->ring[q->used->index % q->queue_size].length = sizeof(struct vnet_bridge_pkt); // This should be the total length of data sent to guest (header+pkt_data)
 274
 275             q->used->index++;
 276             q->cur_avail_idx++;
 277         } else {
 278             //PrintError("VNET Bridge: guest RX buffer full: cur_avai_idx %d, idx: %d\nDisable Bridge\n", q->cur_avail_idx, q->avail->index);
 279             vnet_state->pkt_drop ++;
 280             v3_vnet_disable_bridge();
 281         }
 282     }
 283
 284     if(sent == 0){
 285         goto exit;
 286     }
 287
 288     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 289         v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 290         vnet_state->virtio_cfg.pci_isr = 0x1;
 291         PrintDebug("Raising IRQ %d\n",  vnet_state->pci_dev->config_header.intr_line);
 292     }
 293
 294     ret_val = 0;
 295
 296 exit:
 297
 298 #ifdef CONFIG_VNET_PROFILE
 299     if (vnet_state->pkt_recv % 10000 == 0)
 300         PrintError("Vnet Bridge: sent: %ld, rxed: %ld, dropped: %ld\n",
 301                         vnet_state->pkt_sent,
 302                         vnet_state->pkt_recv,
 303                         vnet_state->pkt_drop);
 304 #endif
 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
 321     while (q->cur_avail_idx != q->avail->index) {
 322         uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
 323         struct vring_desc * pkt_desc = NULL;
 324         struct vnet_bridge_pkt * virtio_pkt = NULL;
 325
 326         pkt_desc = &(q->desc[desc_idx]);
 327
 328         PrintDebug("VNET Bridge: Handle TX desc buf_len: %d\n", pkt_desc->length);
 329
 330         if (guest_pa_to_host_va(core, pkt_desc->addr_gpa, (addr_t *)&(virtio_pkt)) == -1) {
 331             PrintError("Could not translate buffer address\n");
 332             return -1;
 333         }
 334
 335         PrintDebug("VNET Bridge: TX: on cpu %d pkt size: %d, dst link: %d\n", cpu, virtio_pkt->pkt_size, virtio_pkt->link_id);
 336
 337         v3_vnet_bridge_rx(virtio_pkt->pkt, virtio_pkt->pkt_size, virtio_pkt->link_id);
 338
 339         q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
 340         q->used->ring[q->used->index % q->queue_size].length = pkt_desc->length; // What do we set this to????
 341         q->used->index++;
 342
 343         vnet_state->pkt_sent ++;
 344
 345         q->cur_avail_idx++;
 346     }
 347
 348     //interrupt the vnet to poll pkts
 349     int cpu = V3_Get_CPU();
 350     cpu = (cpu == 0)?1:0;
 351     v3_interrupt_cpu(vnet_state->vm, cpu, V3_VNET_POLLING_VECTOR);
 352
 353     if((vnet_state->pkt_sent % (QUEUE_SIZE/20)) == 0) { //optimized for guest's, batch the interrupts
 354             if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 355                 v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 356                 vnet_state->virtio_cfg.pci_isr = 0x1;
 357             }
 358     }
 359
 360 #ifdef CONFIG_VNET_PROFILE
 361     if (vnet_state->pkt_sent % 10000 == 0)
 362         PrintError("Vnet Bridge: sent: %ld, rxed: %ld, dropped: %ld\n",
 363                         vnet_state->pkt_sent,
 364                         vnet_state->pkt_recv,
 365                         vnet_state->pkt_drop);
 366 #endif
 367
 368     return 0;
 369 }
 370
 371
 372 static int handle_rx_kick(struct guest_info *core, struct virtio_vnet_state * vnet_state)
 373 {
 374     v3_vnet_enable_bridge();
 375
 376     return 0;
 377 }
 378
 379 static int vnet_virtio_io_write(struct guest_info * core, uint16_t port, void * src, uint_t length, void * private_data) {
 380     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 381     int port_idx = port % vnet_state->io_range_size;
 382
 383     PrintDebug("VNET Bridge: VIRTIO VNET Write for port %d len=%d, value=%x\n",
 384                port, length, *(uint32_t *)src);
 385     PrintDebug("VNET Bridge: port idx=%d\n", port_idx);
 386
 387
 388     switch (port_idx) {
 389         case GUEST_FEATURES_PORT:
 390             if (length != 4) {
 391                 PrintError("Illegal write length for guest features\n");
 392                 return -1;
 393             }
 394             vnet_state->virtio_cfg.guest_features = *(uint32_t *)src;
 395
 396             break;
 397         case VRING_PG_NUM_PORT:
 398             if (length == 4) {
 399                 addr_t pfn = *(uint32_t *)src;
 400                 addr_t page_addr = (pfn << VIRTIO_PAGE_SHIFT);
 401
 402                 vnet_state->cur_queue->pfn = pfn;
 403
 404                 vnet_state->cur_queue->ring_desc_addr = page_addr ;
 405                 vnet_state->cur_queue->ring_avail_addr = page_addr + (QUEUE_SIZE * sizeof(struct vring_desc));
 406                 vnet_state->cur_queue->ring_used_addr = ( vnet_state->cur_queue->ring_avail_addr + \
 407                                                  sizeof(struct vring_avail)    + \
 408                                                  (QUEUE_SIZE * sizeof(uint16_t)));
 409
 410                 // round up to next page boundary.
 411                 vnet_state->cur_queue->ring_used_addr = (vnet_state->cur_queue->ring_used_addr + 0xfff) & ~0xfff;
 412
 413                 if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_desc_addr, (addr_t *)&(vnet_state->cur_queue->desc)) == -1) {
 414                     PrintError("Could not translate ring descriptor address\n");
 415                     return -1;
 416                 }
 417
 418                 if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_avail_addr, (addr_t *)&(vnet_state->cur_queue->avail)) == -1) {
 419                     PrintError("Could not translate ring available address\n");
 420                     return -1;
 421                 }
 422
 423                 if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_used_addr, (addr_t *)&(vnet_state->cur_queue->used)) == -1) {
 424                     PrintError("Could not translate ring used address\n");
 425                     return -1;
 426                 }
 427
 428                 PrintDebug("VNET Bridge: RingDesc_addr=%p, Avail_addr=%p, Used_addr=%p\n",
 429                            (void *)(vnet_state->cur_queue->ring_desc_addr),
 430                            (void *)(vnet_state->cur_queue->ring_avail_addr),
 431                            (void *)(vnet_state->cur_queue->ring_used_addr));
 432
 433                 PrintDebug("VNET Bridge: RingDesc=%p, Avail=%p, Used=%p\n",
 434                            vnet_state->cur_queue->desc, vnet_state->cur_queue->avail, vnet_state->cur_queue->used);
 435
 436                 if(vnet_state->queue[RECV_QUEUE].avail != NULL){
 437                     vnet_state->ready = 1;
 438                 }
 439             } else {
 440                 PrintError("Illegal write length for page frame number\n");
 441                 return -1;
 442             }
 443             break;
 444         case VRING_Q_SEL_PORT:
 445             vnet_state->virtio_cfg.vring_queue_selector = *(uint16_t *)src;
 446
 447             if (vnet_state->virtio_cfg.vring_queue_selector > NUM_QUEUES) {
 448                 PrintError("VNET Bridge device has no qeueues. Selected %d\n",
 449                            vnet_state->virtio_cfg.vring_queue_selector);
 450                 return -1;
 451             }
 452
 453             vnet_state->cur_queue = &(vnet_state->queue[vnet_state->virtio_cfg.vring_queue_selector]);
 454
 455             break;
 456         case VRING_Q_NOTIFY_PORT: {
 457             uint16_t queue_idx = *(uint16_t *)src;
 458
 459             PrintDebug("VNET Bridge: Handling Kick\n");
 460
 461             if (queue_idx == 0) {
 462                 if (handle_cmd_kick(core, vnet_state) == -1) {
 463                     PrintError("Could not handle Virtio VNET Control command\n");
 464                     return -1;
 465                 }
 466             } else if (queue_idx == 1) {
 467                 if (handle_pkt_kick(core, vnet_state) == -1){
 468                     PrintError("Could not handle Virtio VNET TX\n");
 469                     return -1;
 470                 }
 471             } else if (queue_idx == 2) {
 472                 if (handle_rx_kick(core, vnet_state) == -1){
 473                     PrintError("Could not handle Virtio RX buffer refills Kick\n");
 474                     return -1;
 475                 }
 476             } else {
 477                 PrintError("VNET Bridge: Kick on invalid queue (%d)\n", queue_idx);
 478                 return -1;
 479             }
 480
 481             break;
 482         }
 483         case VIRTIO_STATUS_PORT:
 484             vnet_state->virtio_cfg.status = *(uint8_t *)src;
 485
 486             if (vnet_state->virtio_cfg.status == 0) {
 487                 PrintDebug("VNET Bridge: Resetting device\n");
 488                 virtio_reset(vnet_state);
 489             }
 490
 491             break;
 492
 493         case VIRTIO_ISR_PORT:
 494             vnet_state->virtio_cfg.pci_isr = *(uint8_t *)src;
 495             break;
 496         default:
 497             return -1;
 498             break;
 499     }
 500
 501     return length;
 502 }
 503
 504
 505 static int vnet_virtio_io_read(struct guest_info * core, uint16_t port, void * dst, uint_t length, void * private_data) {
 506
 507     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 508     int port_idx = port % vnet_state->io_range_size;
 509
 510 /*
 511     PrintDebug("VirtioVNET: VIRTIO SYMBIOTIC Read  for port %d (index =%d), length=%d\n",
 512                port, port_idx, length);
 513 */
 514     switch (port_idx) {
 515         case HOST_FEATURES_PORT:
 516             if (length != 4) {
 517                 PrintError("Illegal read length for host features\n");
 518                 return -1;
 519             }
 520
 521             *(uint32_t *)dst = vnet_state->virtio_cfg.host_features;
 522
 523             break;
 524         case VRING_PG_NUM_PORT:
 525             if (length != 4) {
 526                 PrintError("Illegal read length for page frame number\n");
 527                 return -1;
 528             }
 529
 530             *(uint32_t *)dst = vnet_state->cur_queue->pfn;
 531
 532             break;
 533         case VRING_SIZE_PORT:
 534             if (length != 2) {
 535                 PrintError("Illegal read length for vring size\n");
 536                 return -1;
 537             }
 538
 539             *(uint16_t *)dst = vnet_state->cur_queue->queue_size;
 540
 541             break;
 542
 543         case VIRTIO_STATUS_PORT:
 544             if (length != 1) {
 545                 PrintError("Illegal read length for status\n");
 546                 return -1;
 547             }
 548
 549             *(uint8_t *)dst = vnet_state->virtio_cfg.status;
 550             break;
 551
 552         case VIRTIO_ISR_PORT:
 553             *(uint8_t *)dst = vnet_state->virtio_cfg.pci_isr;
 554             vnet_state->virtio_cfg.pci_isr = 0;
 555             v3_pci_lower_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 556             break;
 557
 558         default:
 559             if ( (port_idx >= sizeof(struct virtio_config)) &&
 560                  (port_idx < (sizeof(struct virtio_config) + sizeof(struct vnet_config))) ) {
 561                 int cfg_offset = port_idx - sizeof(struct virtio_config);
 562                 uint8_t * cfg_ptr = (uint8_t *)&(vnet_state->vnet_cfg);
 563
 564                 memcpy(dst, cfg_ptr + cfg_offset, length);
 565
 566             } else {
 567                 PrintError("Read of Unhandled Virtio Read\n");
 568                 return -1;
 569             }
 570
 571             break;
 572     }
 573
 574     return length;
 575 }
 576
 577
 578
 579 static struct v3_device_ops dev_ops = {
 580     .free = NULL,
 581     .reset = NULL,
 582     .start = NULL,
 583     .stop = NULL,
 584 };
 585
 586 static int dev_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
 587     struct vm_device * pci_bus = v3_find_dev(vm, v3_cfg_val(cfg, "bus"));
 588     struct virtio_vnet_state * vnet_state = NULL;
 589     struct pci_device * pci_dev = NULL;
 590     char * name = v3_cfg_val(cfg, "name");
 591
 592     PrintDebug("VNET Bridge: Initializing VNET Bridge Control device: %s\n", name);
 593
 594     if (pci_bus == NULL) {
 595         PrintError("VNET Bridge device require a PCI Bus");
 596         return -1;
 597     }
 598
 599     vnet_state  = (struct virtio_vnet_state *)V3_Malloc(sizeof(struct virtio_vnet_state));
 600     memset(vnet_state, 0, sizeof(struct virtio_vnet_state));
 601
 602     vnet_state->vm = vm;
 603
 604     struct vm_device * dev = v3_allocate_device(name, &dev_ops, vnet_state);
 605
 606     if (v3_attach_device(vm, dev) == -1) {
 607         PrintError("Could not attach device %s\n", name);
 608         return -1;
 609     }
 610
 611
 612     // PCI initialization
 613     {
 614         struct v3_pci_bar bars[6];
 615         int num_ports = sizeof(struct virtio_config) + sizeof(struct vnet_config);
 616         int tmp_ports = num_ports;
 617         int i;
 618
 619         // This gets the number of ports, rounded up to a power of 2
 620         vnet_state->io_range_size = 1; // must be a power of 2
 621
 622         while (tmp_ports > 0) {
 623             tmp_ports >>= 1;
 624             vnet_state->io_range_size <<= 1;
 625         }
 626
 627         // this is to account for any low order bits being set in num_ports
 628         // if there are none, then num_ports was already a power of 2 so we shift right to reset it
 629         if ((num_ports & ((vnet_state->io_range_size >> 1) - 1)) == 0) {
 630             vnet_state->io_range_size >>= 1;
 631         }
 632
 633         for (i = 0; i < 6; i++) {
 634             bars[i].type = PCI_BAR_NONE;
 635         }
 636
 637         bars[0].type = PCI_BAR_IO;
 638         bars[0].default_base_port = -1;
 639         bars[0].num_ports = vnet_state->io_range_size;
 640         bars[0].io_read = vnet_virtio_io_read;
 641         bars[0].io_write = vnet_virtio_io_write;
 642         bars[0].private_data = vnet_state;
 643
 644         pci_dev = v3_pci_register_device(pci_bus, PCI_STD_DEVICE,
 645                                          0, PCI_AUTO_DEV_NUM, 0,
 646                                          "LNX_VIRTIO_VNET", bars,
 647                                          NULL, NULL, NULL, vnet_state);
 648
 649         if (!pci_dev) {
 650             PrintError("Could not register PCI Device\n");
 651             return -1;
 652         }
 653
 654         pci_dev->config_header.vendor_id = VIRTIO_VENDOR_ID;
 655         pci_dev->config_header.subsystem_vendor_id = VIRTIO_SUBVENDOR_ID;
 656         pci_dev->config_header.device_id = VIRTIO_VNET_DEV_ID;
 657         pci_dev->config_header.class = PCI_CLASS_MEMORY;
 658         pci_dev->config_header.subclass = PCI_MEM_SUBCLASS_RAM;
 659         pci_dev->config_header.subsystem_id = VIRTIO_VNET_SUBDEVICE_ID;
 660         pci_dev->config_header.intr_pin = 1;
 661         pci_dev->config_header.max_latency = 1; // ?? (qemu does it...)
 662
 663
 664         vnet_state->pci_dev = pci_dev;
 665         vnet_state->pci_bus = pci_bus;
 666     }
 667
 668     virtio_reset(vnet_state);
 669
 670     V3_Print("Registering Virtio device as vnet bridge\n");
 671     v3_vnet_add_bridge(vm, vnet_pkt_input_cb, vnet_pkt_input_xcall, 0, 500000, (void *)vnet_state);
 672
 673
 674     return 0;
 675 }
 676
 677
 678 device_register("LNX_VIRTIO_VNET", dev_init)