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
 305 #endif
 306
 307     v3_unlock_irqrestore(vnet_state->lock, flags);
 308
 309     return ret_val;
 310 }
 311
 312 static void vnet_pkt_input_xcall(void *data){
 313     struct v3_vnet_bridge_input_args *args = (struct v3_vnet_bridge_input_args *)data;
 314
 315     vnet_pkt_input_cb(args->vm, args->vnet_pkts, args->pkt_num, args->private_data);
 316 }
 317
 318 static int handle_pkt_kick(struct guest_info *core, struct virtio_vnet_state * vnet_state)
 319 {
 320     struct virtio_queue * q = &(vnet_state->queue[XMIT_QUEUE]);
 321
 322     while (q->cur_avail_idx != q->avail->index) {
 323         uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
 324         struct vring_desc * pkt_desc = NULL;
 325         struct vnet_bridge_pkt * virtio_pkt = NULL;
 326
 327         pkt_desc = &(q->desc[desc_idx]);
 328
 329         PrintDebug("VNET Bridge: Handle TX desc buf_len: %d\n", pkt_desc->length);
 330
 331         if (guest_pa_to_host_va(core, pkt_desc->addr_gpa, (addr_t *)&(virtio_pkt)) == -1) {
 332             PrintError("Could not translate buffer address\n");
 333             return -1;
 334         }
 335
 336         PrintDebug("VNET Bridge: TX: on cpu %d pkt size: %d, dst link: %d\n", cpu, virtio_pkt->pkt_size, virtio_pkt->link_id);
 337
 338         v3_vnet_bridge_rx(virtio_pkt->pkt, virtio_pkt->pkt_size, virtio_pkt->link_id);
 339
 340         q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
 341         q->used->ring[q->used->index % q->queue_size].length = pkt_desc->length; // What do we set this to????
 342         q->used->index++;
 343
 344         vnet_state->pkt_sent ++;
 345
 346         q->cur_avail_idx++;
 347     }
 348
 349     //interrupt the vnet to poll pkts
 350     int cpu = V3_Get_CPU();
 351     cpu = (cpu == 0)?1:0;
 352     V3_lapic_send_ipi(cpu, V3_VNET_POLLING_VECTOR);
 353
 354     if((vnet_state->pkt_sent % (QUEUE_SIZE/20)) == 0) { //optimized for guest's, batch the interrupts
 355             if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 356                 v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 357                 vnet_state->virtio_cfg.pci_isr = 0x1;
 358             }
 359     }
 360
 361 #ifdef CONFIG_VNET_PROFILE
 362     if (vnet_state->pkt_sent % 10000 == 0)
 363         PrintError("Vnet Bridge: sent: %ld, rxed: %ld, dropped: %ld\n",
 364                         vnet_state->pkt_sent,
 365                         vnet_state->pkt_recv,
 366                         vnet_state->pkt_drop);
 367
 368 #endif
 369
 370     return 0;
 371 }
 372
 373
 374 static int handle_rx_kick(struct guest_info *core, struct virtio_vnet_state * vnet_state)
 375 {
 376     v3_vnet_enable_bridge();
 377     //PrintError("Enable Bridge\n");
 378
 379     return 0;
 380 }
 381
 382 static int vnet_virtio_io_write(struct guest_info * core, uint16_t port, void * src, uint_t length, void * private_data) {
 383     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 384     int port_idx = port % vnet_state->io_range_size;
 385
 386     PrintDebug("VNET Bridge: VIRTIO VNET Write for port %d len=%d, value=%x\n",
 387                port, length, *(uint32_t *)src);
 388     PrintDebug("VNET Bridge: port idx=%d\n", port_idx);
 389
 390
 391     switch (port_idx) {
 392         case GUEST_FEATURES_PORT:
 393             if (length != 4) {
 394                 PrintError("Illegal write length for guest features\n");
 395                 return -1;
 396             }
 397             vnet_state->virtio_cfg.guest_features = *(uint32_t *)src;
 398
 399             break;
 400         case VRING_PG_NUM_PORT:
 401             if (length == 4) {
 402                 addr_t pfn = *(uint32_t *)src;
 403                 addr_t page_addr = (pfn << VIRTIO_PAGE_SHIFT);
 404
 405                 vnet_state->cur_queue->pfn = pfn;
 406
 407                 vnet_state->cur_queue->ring_desc_addr = page_addr ;
 408                 vnet_state->cur_queue->ring_avail_addr = page_addr + (QUEUE_SIZE * sizeof(struct vring_desc));
 409                 vnet_state->cur_queue->ring_used_addr = ( vnet_state->cur_queue->ring_avail_addr + \
 410                                                  sizeof(struct vring_avail)    + \
 411                                                  (QUEUE_SIZE * sizeof(uint16_t)));
 412
 413                 // round up to next page boundary.
 414                 vnet_state->cur_queue->ring_used_addr = (vnet_state->cur_queue->ring_used_addr + 0xfff) & ~0xfff;
 415
 416                 if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_desc_addr, (addr_t *)&(vnet_state->cur_queue->desc)) == -1) {
 417                     PrintError("Could not translate ring descriptor address\n");
 418                     return -1;
 419                 }
 420
 421                 if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_avail_addr, (addr_t *)&(vnet_state->cur_queue->avail)) == -1) {
 422                     PrintError("Could not translate ring available address\n");
 423                     return -1;
 424                 }
 425
 426                 if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_used_addr, (addr_t *)&(vnet_state->cur_queue->used)) == -1) {
 427                     PrintError("Could not translate ring used address\n");
 428                     return -1;
 429                 }
 430
 431                 PrintDebug("VNET Bridge: RingDesc_addr=%p, Avail_addr=%p, Used_addr=%p\n",
 432                            (void *)(vnet_state->cur_queue->ring_desc_addr),
 433                            (void *)(vnet_state->cur_queue->ring_avail_addr),
 434                            (void *)(vnet_state->cur_queue->ring_used_addr));
 435
 436                 PrintDebug("VNET Bridge: RingDesc=%p, Avail=%p, Used=%p\n",
 437                            vnet_state->cur_queue->desc, vnet_state->cur_queue->avail, vnet_state->cur_queue->used);
 438
 439                 if(vnet_state->queue[RECV_QUEUE].avail != NULL){
 440                     vnet_state->ready = 1;
 441                 }
 442             } else {
 443                 PrintError("Illegal write length for page frame number\n");
 444                 return -1;
 445             }
 446             break;
 447         case VRING_Q_SEL_PORT:
 448             vnet_state->virtio_cfg.vring_queue_selector = *(uint16_t *)src;
 449
 450             if (vnet_state->virtio_cfg.vring_queue_selector > NUM_QUEUES) {
 451                 PrintError("VNET Bridge device has no qeueues. Selected %d\n",
 452                            vnet_state->virtio_cfg.vring_queue_selector);
 453                 return -1;
 454             }
 455
 456             vnet_state->cur_queue = &(vnet_state->queue[vnet_state->virtio_cfg.vring_queue_selector]);
 457
 458             break;
 459         case VRING_Q_NOTIFY_PORT: {
 460             uint16_t queue_idx = *(uint16_t *)src;
 461
 462             PrintDebug("VNET Bridge: Handling Kick\n");
 463
 464             if (queue_idx == 0) {
 465                 if (handle_cmd_kick(core, vnet_state) == -1) {
 466                     PrintError("Could not handle Virtio VNET Control command\n");
 467                     return -1;
 468                 }
 469             } else if (queue_idx == 1) {
 470                 if (handle_pkt_kick(core, vnet_state) == -1){
 471                     PrintError("Could not handle Virtio VNET TX\n");
 472                     return -1;
 473                 }
 474             } else if (queue_idx == 2) {
 475                 if (handle_rx_kick(core, vnet_state) == -1){
 476                     PrintError("Could not handle Virtio RX buffer refills Kick\n");
 477                     return -1;
 478                 }
 479             } else {
 480                 PrintError("VNET Bridge: Kick on invalid queue (%d)\n", queue_idx);
 481                 return -1;
 482             }
 483
 484             break;
 485         }
 486         case VIRTIO_STATUS_PORT:
 487             vnet_state->virtio_cfg.status = *(uint8_t *)src;
 488
 489             if (vnet_state->virtio_cfg.status == 0) {
 490                 PrintDebug("VNET Bridge: Resetting device\n");
 491                 virtio_reset(vnet_state);
 492             }
 493
 494             break;
 495
 496         case VIRTIO_ISR_PORT:
 497             vnet_state->virtio_cfg.pci_isr = *(uint8_t *)src;
 498             break;
 499         default:
 500             return -1;
 501             break;
 502     }
 503
 504     return length;
 505 }
 506
 507
 508 static int vnet_virtio_io_read(struct guest_info * core, uint16_t port, void * dst, uint_t length, void * private_data) {
 509
 510     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 511     int port_idx = port % vnet_state->io_range_size;
 512
 513 /*
 514     PrintDebug("VirtioVNET: VIRTIO SYMBIOTIC Read  for port %d (index =%d), length=%d\n",
 515                port, port_idx, length);
 516 */
 517     switch (port_idx) {
 518         case HOST_FEATURES_PORT:
 519             if (length != 4) {
 520                 PrintError("Illegal read length for host features\n");
 521                 return -1;
 522             }
 523
 524             *(uint32_t *)dst = vnet_state->virtio_cfg.host_features;
 525
 526             break;
 527         case VRING_PG_NUM_PORT:
 528             if (length != 4) {
 529                 PrintError("Illegal read length for page frame number\n");
 530                 return -1;
 531             }
 532
 533             *(uint32_t *)dst = vnet_state->cur_queue->pfn;
 534
 535             break;
 536         case VRING_SIZE_PORT:
 537             if (length != 2) {
 538                 PrintError("Illegal read length for vring size\n");
 539                 return -1;
 540             }
 541
 542             *(uint16_t *)dst = vnet_state->cur_queue->queue_size;
 543
 544             break;
 545
 546         case VIRTIO_STATUS_PORT:
 547             if (length != 1) {
 548                 PrintError("Illegal read length for status\n");
 549                 return -1;
 550             }
 551
 552             *(uint8_t *)dst = vnet_state->virtio_cfg.status;
 553             break;
 554
 555         case VIRTIO_ISR_PORT:
 556             *(uint8_t *)dst = vnet_state->virtio_cfg.pci_isr;
 557             vnet_state->virtio_cfg.pci_isr = 0;
 558             v3_pci_lower_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 559             break;
 560
 561         default:
 562             if ( (port_idx >= sizeof(struct virtio_config)) &&
 563                  (port_idx < (sizeof(struct virtio_config) + sizeof(struct vnet_config))) ) {
 564                 int cfg_offset = port_idx - sizeof(struct virtio_config);
 565                 uint8_t * cfg_ptr = (uint8_t *)&(vnet_state->vnet_cfg);
 566
 567                 memcpy(dst, cfg_ptr + cfg_offset, length);
 568
 569             } else {
 570                 PrintError("Read of Unhandled Virtio Read\n");
 571                 return -1;
 572             }
 573
 574             break;
 575     }
 576
 577     return length;
 578 }
 579
 580
 581
 582 static struct v3_device_ops dev_ops = {
 583     .free = NULL,
 584     .reset = NULL,
 585     .start = NULL,
 586     .stop = NULL,
 587 };
 588
 589 static int dev_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
 590     struct vm_device * pci_bus = v3_find_dev(vm, v3_cfg_val(cfg, "bus"));
 591     struct virtio_vnet_state * vnet_state = NULL;
 592     struct pci_device * pci_dev = NULL;
 593     char * name = v3_cfg_val(cfg, "name");
 594
 595     PrintDebug("VNET Bridge: Initializing VNET Bridge Control device: %s\n", name);
 596
 597     if (pci_bus == NULL) {
 598         PrintError("VNET Bridge device require a PCI Bus");
 599         return -1;
 600     }
 601
 602     vnet_state  = (struct virtio_vnet_state *)V3_Malloc(sizeof(struct virtio_vnet_state));
 603     memset(vnet_state, 0, sizeof(struct virtio_vnet_state));
 604
 605     vnet_state->vm = vm;
 606
 607     struct vm_device * dev = v3_allocate_device(name, &dev_ops, vnet_state);
 608
 609     if (v3_attach_device(vm, dev) == -1) {
 610         PrintError("Could not attach device %s\n", name);
 611         return -1;
 612     }
 613
 614
 615     // PCI initialization
 616     {
 617         struct v3_pci_bar bars[6];
 618         int num_ports = sizeof(struct virtio_config) + sizeof(struct vnet_config);
 619         int tmp_ports = num_ports;
 620         int i;
 621
 622         // This gets the number of ports, rounded up to a power of 2
 623         vnet_state->io_range_size = 1; // must be a power of 2
 624
 625         while (tmp_ports > 0) {
 626             tmp_ports >>= 1;
 627             vnet_state->io_range_size <<= 1;
 628         }
 629
 630         // this is to account for any low order bits being set in num_ports
 631         // if there are none, then num_ports was already a power of 2 so we shift right to reset it
 632         if ((num_ports & ((vnet_state->io_range_size >> 1) - 1)) == 0) {
 633             vnet_state->io_range_size >>= 1;
 634         }
 635
 636         for (i = 0; i < 6; i++) {
 637             bars[i].type = PCI_BAR_NONE;
 638         }
 639
 640         bars[0].type = PCI_BAR_IO;
 641         bars[0].default_base_port = -1;
 642         bars[0].num_ports = vnet_state->io_range_size;
 643         bars[0].io_read = vnet_virtio_io_read;
 644         bars[0].io_write = vnet_virtio_io_write;
 645         bars[0].private_data = vnet_state;
 646
 647         pci_dev = v3_pci_register_device(pci_bus, PCI_STD_DEVICE,
 648                                          0, PCI_AUTO_DEV_NUM, 0,
 649                                          "LNX_VIRTIO_VNET", bars,
 650                                          NULL, NULL, NULL, vnet_state);
 651
 652         if (!pci_dev) {
 653             PrintError("Could not register PCI Device\n");
 654             return -1;
 655         }
 656
 657         pci_dev->config_header.vendor_id = VIRTIO_VENDOR_ID;
 658         pci_dev->config_header.subsystem_vendor_id = VIRTIO_SUBVENDOR_ID;
 659         pci_dev->config_header.device_id = VIRTIO_VNET_DEV_ID;
 660         pci_dev->config_header.class = PCI_CLASS_MEMORY;
 661         pci_dev->config_header.subclass = PCI_MEM_SUBCLASS_RAM;
 662         pci_dev->config_header.subsystem_id = VIRTIO_VNET_SUBDEVICE_ID;
 663         pci_dev->config_header.intr_pin = 1;
 664         pci_dev->config_header.max_latency = 1; // ?? (qemu does it...)
 665
 666
 667         vnet_state->pci_dev = pci_dev;
 668         vnet_state->pci_bus = pci_bus;
 669     }
 670
 671     virtio_reset(vnet_state);
 672
 673     V3_Print("Registering Virtio device as vnet bridge\n");
 674     v3_vnet_add_bridge(vm, vnet_pkt_input_cb, vnet_pkt_input_xcall, 5, 1000000, (void *)vnet_state);
 675
 676
 677     return 0;
 678 }
 679
 680
 681 device_register("LNX_VIRTIO_VNET", dev_init)