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     uint32_t pkt_sent;
  67     uint32_t pkt_recv;
  68     uint32_t pkt_drop;
  69     uint32_t tx_exit;
  70     uint32_t rx_exit;
  71     uint32_t total_exit;
  72
  73     int ready;
  74 };
  75
  76 #define VNET_GET_ROUTES 10
  77 #define VNET_ADD_ROUTE 11
  78 #define VNET_DEL_ROUTE 12
  79
  80 #define VNET_GET_LINKS 20
  81 #define VNET_ADD_LINK 21
  82 #define VNET_DEL_LINK 22
  83
  84 // structure of the vnet command header
  85 struct vnet_ctrl_hdr {
  86     uint8_t cmd_type;
  87     uint32_t num_cmds;
  88 } __attribute__((packed));
  89
  90
  91 struct vnet_bridge_pkt {
  92     uint32_t link_id;
  93     uint32_t pkt_size;
  94     uint8_t pkt[ETHERNET_PACKET_LEN];
  95 }__attribute__((packed));
  96
  97
  98 static int virtio_reset(struct virtio_vnet_state * vnet_state) {
  99
 100     memset(vnet_state->queue, 0, sizeof(struct virtio_queue) * NUM_QUEUES);
 101
 102     vnet_state->cur_queue = &(vnet_state->queue[0]);
 103
 104     vnet_state->virtio_cfg.status = 0;
 105     vnet_state->virtio_cfg.pci_isr = 0;
 106
 107     vnet_state->queue[0].queue_size = CMD_QUEUE_SIZE;
 108     vnet_state->queue[1].queue_size = QUEUE_SIZE;
 109     vnet_state->queue[2].queue_size = QUEUE_SIZE;
 110
 111     memset(&(vnet_state->vnet_cfg), 0, sizeof(struct vnet_config));
 112     v3_lock_init(&(vnet_state->lock));
 113
 114     return 0;
 115 }
 116
 117
 118
 119 static int get_desc_count(struct virtio_queue * q, int index) {
 120     struct vring_desc * tmp_desc = &(q->desc[index]);
 121     int cnt = 1;
 122
 123     while (tmp_desc->flags & VIRTIO_NEXT_FLAG) {
 124         tmp_desc = &(q->desc[tmp_desc->next]);
 125         cnt++;
 126     }
 127
 128     return cnt;
 129 }
 130
 131
 132
 133
 134 static int handle_cmd_kick(struct guest_info * core, struct virtio_vnet_state * vnet_state) {
 135     struct virtio_queue * q = &(vnet_state->queue[0]);
 136
 137     PrintDebug("VNET Bridge: Handling command  queue\n");
 138
 139     while (q->cur_avail_idx != q->avail->index) {
 140         struct vring_desc * hdr_desc = NULL;
 141         struct vring_desc * buf_desc = NULL;
 142         struct vring_desc * status_desc = NULL;
 143         uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
 144         uint16_t desc_cnt = get_desc_count(q, desc_idx);
 145         struct vnet_ctrl_hdr * hdr = NULL;
 146         int i;
 147         int xfer_len = 0;
 148         uint8_t * status_ptr = NULL;
 149         uint8_t status = 0;
 150
 151
 152         PrintDebug("VNET Bridge: CMD: Descriptor Count=%d, index=%d, desc_idx=%d\n",
 153                    desc_cnt, q->cur_avail_idx % QUEUE_SIZE, desc_idx);
 154
 155         if (desc_cnt < 3) {
 156             PrintError("VNET Bridge cmd must include at least 3 descriptors (cnt=%d)\n", desc_cnt);
 157             return -1;
 158         }
 159
 160         hdr_desc = &(q->desc[desc_idx]);
 161
 162         if (v3_gpa_to_hva(core, hdr_desc->addr_gpa, (addr_t *)&hdr) == -1) {
 163             PrintError("Could not translate VirtioVNET header address\n");
 164             return -1;
 165         }
 166
 167         desc_idx = hdr_desc->next;
 168
 169         if (hdr->cmd_type == VNET_ADD_ROUTE) {
 170
 171             for (i = 0; i < hdr->num_cmds; i++) {
 172                 uint8_t tmp_status = 0;
 173                 struct v3_vnet_route * route = NULL;
 174
 175                 buf_desc = &(q->desc[desc_idx]);
 176
 177                 if (v3_gpa_to_hva(core, buf_desc->addr_gpa, (addr_t *)&(route)) == -1) {
 178                     PrintError("Could not translate route address\n");
 179                     return -1;
 180                 }
 181
 182                 // add route
 183                 PrintDebug("VNET Bridge: Adding VNET Route\n");
 184
 185                 tmp_status = v3_vnet_add_route(*route);
 186
 187                 PrintDebug("VNET Route Added\n");
 188
 189                 if (tmp_status != 0) {
 190                     PrintError("Error adding VNET ROUTE\n");
 191                     status = tmp_status;
 192                 }
 193
 194                 xfer_len += buf_desc->length;
 195                 desc_idx = buf_desc->next;
 196             }
 197
 198         }
 199
 200
 201
 202         status_desc = &(q->desc[desc_idx]);
 203
 204         if (v3_gpa_to_hva(core, status_desc->addr_gpa, (addr_t *)&status_ptr) == -1) {
 205             PrintError("VirtioVNET Error could not translate status address\n");
 206             return -1;
 207         }
 208
 209         xfer_len += status_desc->length;
 210         *status_ptr = status;
 211
 212         PrintDebug("Transferred %d bytes (xfer_len)\n", xfer_len);
 213         q->used->ring[q->used->index % QUEUE_SIZE].id = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
 214         q->used->ring[q->used->index % QUEUE_SIZE].length = xfer_len; // set to total inbound xfer length
 215
 216         q->used->index++;
 217         q->cur_avail_idx++;
 218     }
 219
 220
 221     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 222         PrintDebug("Raising IRQ %d\n",  vnet_state->pci_dev->config_header.intr_line);
 223         v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 224         vnet_state->virtio_cfg.pci_isr = 1;
 225     }
 226
 227
 228     return 0;
 229 }
 230
 231
 232 static int vnet_pkt_input_cb(struct v3_vm_info * vm,  struct v3_vnet_pkt vnet_pkts[], uint16_t pkt_num, void * private_data){
 233     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 234     struct virtio_queue * q = &(vnet_state->queue[RECV_QUEUE]);
 235     int ret_val = -1;
 236     unsigned long flags;
 237     uint16_t sent;
 238     struct v3_vnet_pkt * pkt = NULL;
 239
 240     if (pkt_num <= 0) {
 241         return 0;
 242     }
 243
 244     flags = v3_lock_irqsave(vnet_state->lock);
 245
 246     if (q->ring_avail_addr == 0) {
 247         PrintError("Queue is not set\n");
 248         v3_unlock_irqrestore(vnet_state->lock, flags);
 249         return ret_val;
 250     }
 251
 252     PrintDebug("VNET Bridge: RX: running on cpu: %d, num of pkts: %d\n", V3_Get_CPU(), pkt_num);
 253
 254     for (sent = 0; sent < pkt_num; sent++) {
 255         pkt = &vnet_pkts[sent];
 256         vnet_state->pkt_recv++;
 257
 258         if (q->cur_avail_idx != q->avail->index) {
 259             uint16_t pkt_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
 260             struct vring_desc * pkt_desc = NULL;
 261             struct vnet_bridge_pkt * virtio_pkt = NULL;
 262
 263             pkt_desc = &(q->desc[pkt_idx]);
 264             PrintDebug("VNET Bridge RX: buffer desc len: %d\n", pkt_desc->length);
 265
 266             if (v3_gpa_to_hva(&(vm->cores[0]), pkt_desc->addr_gpa, (addr_t *)&(virtio_pkt)) == -1) {
 267                 PrintError("Could not translate buffer address\n");
 268                 v3_unlock_irqrestore(vnet_state->lock, flags);
 269                 return ret_val;
 270             }
 271
 272             PrintDebug("VNET Bridge: RX: pkt sent to guest pkt size: %d, dst link: %d\n", pkt->size, pkt->dst_id);
 273
 274             // Fill in dst packet buffer
 275             virtio_pkt->link_id = pkt->dst_id;
 276             virtio_pkt->pkt_size = pkt->size;
 277             memcpy(virtio_pkt->pkt, pkt->data, pkt->size);
 278
 279             q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
 280             q->used->ring[q->used->index % q->queue_size].length = sizeof(struct vnet_bridge_pkt);
 281
 282             q->used->index++;
 283             q->cur_avail_idx++;
 284         } else {
 285             vnet_state->pkt_drop++;
 286             v3_vnet_disable_bridge();
 287         }
 288     }
 289
 290     if (sent == 0) {
 291         v3_unlock_irqrestore(vnet_state->lock, flags);
 292         return ret_val;
 293     }
 294
 295     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 296         v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 297         vnet_state->virtio_cfg.pci_isr = 0x1;
 298         PrintDebug("Raising IRQ %d\n",  vnet_state->pci_dev->config_header.intr_line);
 299     }
 300
 301     ret_val = 0;
 302
 303
 304 #ifdef CONFIG_VNET_PROFILE
 305     if (vnet_state->pkt_recv % 200000 == 0)
 306         PrintError("Vnet Bridge: sent: %ld, rxed: %ld, dropped: %ld, total exit: %ld, tx exit: %ld, rx exit: %ld\n",
 307                    vnet_state->pkt_sent,
 308                    vnet_state->pkt_recv,
 309                    vnet_state->pkt_drop,
 310                    vnet_state->total_exit,
 311                    vnet_state->tx_exit,
 312                    vnet_state->rx_exit);
 313 #endif
 314
 315     v3_unlock_irqrestore(vnet_state->lock, flags);
 316
 317     return ret_val;
 318
 319 }
 320
 321 static void vnet_pkt_input_xcall(void * data) {
 322     struct v3_vnet_bridge_input_args * args = (struct v3_vnet_bridge_input_args *)data;
 323
 324     vnet_pkt_input_cb(args->vm, args->vnet_pkts, args->pkt_num, args->private_data);
 325 }
 326
 327 static int handle_pkt_kick(struct guest_info * core, struct virtio_vnet_state * vnet_state) {
 328     struct virtio_queue * q = &(vnet_state->queue[XMIT_QUEUE]);
 329     unsigned long flags = 0;
 330     int recvd = 0;
 331     int cpu = V3_Get_CPU();
 332
 333     flags = v3_lock_irqsave(vnet_state->lock);
 334
 335     if (q->ring_avail_addr == 0) {
 336         v3_unlock_irqrestore(vnet_state->lock,flags);
 337         return 0;
 338     }
 339
 340     while (q->cur_avail_idx != q->avail->index) {
 341         uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
 342         struct vring_desc * pkt_desc = NULL;
 343         struct vnet_bridge_pkt * virtio_pkt = NULL;
 344
 345         pkt_desc = &(q->desc[desc_idx]);
 346
 347         PrintDebug("VNET Bridge: Handle TX desc buf_len: %d\n", pkt_desc->length);
 348
 349         if (v3_gpa_to_hva(core, pkt_desc->addr_gpa, (addr_t *)&(virtio_pkt)) == -1) {
 350             PrintError("Could not translate buffer address\n");
 351             return -1;
 352         }
 353
 354         PrintDebug("VNET Bridge: TX: on cpu %d pkt size: %d, dst link: %d\n", cpu, virtio_pkt->pkt_size, virtio_pkt->link_id);
 355
 356         v3_vnet_rx(virtio_pkt->pkt, virtio_pkt->pkt_size, virtio_pkt->link_id, LINK_EDGE);
 357
 358         q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
 359         q->used->ring[q->used->index % q->queue_size].length = pkt_desc->length; // What do we set this to????
 360         q->used->index++;
 361
 362         vnet_state->pkt_sent++;
 363         recvd++;
 364
 365         q->cur_avail_idx++;
 366     }
 367
 368     if (recvd == 0) {
 369         v3_unlock_irqrestore(vnet_state->lock,flags);
 370         return 0;
 371     }
 372
 373     //PrintError("In polling get %d\n", recvd);
 374
 375     //if on the dom0 core, interrupt the domU core to poll pkts
 376     //otherwise, call the polling directly
 377
 378
 379     if (vnet_state->vm->cores[0].cpu_id == cpu) {
 380         cpu = (cpu == 0) ? 1 : 0;
 381         v3_interrupt_cpu(vnet_state->vm, cpu, V3_VNET_POLLING_VECTOR);
 382     } else {
 383         v3_vnet_polling();
 384     }
 385
 386     if ((vnet_state->pkt_sent % (QUEUE_SIZE/20)) == 0) {
 387         //optimized for guest's, batch the interrupts
 388
 389         if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 390             v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 391             vnet_state->virtio_cfg.pci_isr = 0x1;
 392         }
 393     }
 394
 395 #ifdef CONFIG_VNET_PROFILE
 396     if (vnet_state->pkt_sent % 200000 == 0)
 397         PrintError("Vnet Bridge: sent: %ld, rxed: %ld, dropped: %ld, total exit: %ld, tx exit: %ld, rx exit: %ld\n",
 398                    vnet_state->pkt_sent,
 399                    vnet_state->pkt_recv,
 400                    vnet_state->pkt_drop,
 401                    vnet_state->total_exit,
 402                    vnet_state->tx_exit,
 403                    vnet_state->rx_exit);
 404 #endif
 405
 406     v3_unlock_irqrestore(vnet_state->lock,flags);
 407
 408     return 0;
 409 }
 410
 411 static int polling_pkt_from_guest(struct v3_vm_info * vm, void *private_data) {
 412     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 413
 414     return handle_pkt_kick(&(vm->cores[0]), vnet_state);
 415 }
 416
 417 static int handle_rx_kick(struct guest_info *core, struct virtio_vnet_state * vnet_state) {
 418     v3_vnet_enable_bridge();
 419
 420     return 0;
 421 }
 422
 423 static int vnet_virtio_io_write(struct guest_info * core, uint16_t port, void * src, uint_t length, void * private_data) {
 424     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 425     int port_idx = port % vnet_state->io_range_size;
 426
 427     PrintDebug("VNET Bridge: VIRTIO VNET Write for port %d len=%d, value=%x\n",
 428                port, length, *(uint32_t *)src);
 429     PrintDebug("VNET Bridge: port idx=%d\n", port_idx);
 430
 431     vnet_state->total_exit++;
 432
 433     switch (port_idx) {
 434         case GUEST_FEATURES_PORT:
 435
 436             if (length != 4) {
 437                 PrintError("Illegal write length for guest features\n");
 438                 return -1;
 439             }
 440
 441             vnet_state->virtio_cfg.guest_features = *(uint32_t *)src;
 442
 443             break;
 444         case VRING_PG_NUM_PORT: {
 445
 446             addr_t pfn = *(uint32_t *)src;
 447             addr_t page_addr = (pfn << VIRTIO_PAGE_SHIFT);
 448
 449             if (length != 4) {
 450                 PrintError("Illegal write length for page frame number\n");
 451                 return -1;
 452             }
 453
 454
 455             vnet_state->cur_queue->pfn = pfn;
 456
 457             vnet_state->cur_queue->ring_desc_addr = page_addr ;
 458             vnet_state->cur_queue->ring_avail_addr = page_addr + (QUEUE_SIZE * sizeof(struct vring_desc));
 459             vnet_state->cur_queue->ring_used_addr = ( vnet_state->cur_queue->ring_avail_addr + \
 460                                                       sizeof(struct vring_avail) + \
 461                                                       (QUEUE_SIZE * sizeof(uint16_t)));
 462
 463             // round up to next page boundary.
 464             vnet_state->cur_queue->ring_used_addr = (vnet_state->cur_queue->ring_used_addr + 0xfff) & ~0xfff;
 465
 466             if (v3_gpa_to_hva(core, vnet_state->cur_queue->ring_desc_addr, (addr_t *)&(vnet_state->cur_queue->desc)) == -1) {
 467                 PrintError("Could not translate ring descriptor address\n");
 468                 return -1;
 469             }
 470
 471             if (v3_gpa_to_hva(core, vnet_state->cur_queue->ring_avail_addr, (addr_t *)&(vnet_state->cur_queue->avail)) == -1) {
 472                 PrintError("Could not translate ring available address\n");
 473                 return -1;
 474             }
 475
 476             if (v3_gpa_to_hva(core, vnet_state->cur_queue->ring_used_addr, (addr_t *)&(vnet_state->cur_queue->used)) == -1) {
 477                 PrintError("Could not translate ring used address\n");
 478                 return -1;
 479             }
 480
 481             PrintDebug("VNET Bridge: RingDesc_addr=%p, Avail_addr=%p, Used_addr=%p\n",
 482                        (void *)(vnet_state->cur_queue->ring_desc_addr),
 483                        (void *)(vnet_state->cur_queue->ring_avail_addr),
 484                        (void *)(vnet_state->cur_queue->ring_used_addr));
 485
 486             PrintDebug("VNET Bridge: RingDesc=%p, Avail=%p, Used=%p\n",
 487                        vnet_state->cur_queue->desc,
 488                        vnet_state->cur_queue->avail,
 489                        vnet_state->cur_queue->used);
 490
 491             if (vnet_state->queue[RECV_QUEUE].avail != NULL){
 492                 vnet_state->ready = 1;
 493             }
 494
 495             //No notify when there is pkt tx from guest
 496             if (vnet_state->queue[XMIT_QUEUE].used != NULL) {
 497                 vnet_state->queue[XMIT_QUEUE].used->flags |= VRING_NO_NOTIFY_FLAG;
 498             }
 499
 500             break;
 501         }
 502         case VRING_Q_SEL_PORT:
 503             vnet_state->virtio_cfg.vring_queue_selector = *(uint16_t *)src;
 504
 505             if (vnet_state->virtio_cfg.vring_queue_selector > NUM_QUEUES) {
 506                 PrintError("VNET Bridge device has no qeueues. Selected %d\n",
 507                            vnet_state->virtio_cfg.vring_queue_selector);
 508                 return -1;
 509             }
 510
 511             vnet_state->cur_queue = &(vnet_state->queue[vnet_state->virtio_cfg.vring_queue_selector]);
 512
 513             break;
 514         case VRING_Q_NOTIFY_PORT: {
 515             uint16_t queue_idx = *(uint16_t *)src;
 516
 517             PrintDebug("VNET Bridge: Handling Kick\n");
 518
 519             if (queue_idx == 0) {
 520                 if (handle_cmd_kick(core, vnet_state) == -1) {
 521                     PrintError("Could not handle Virtio VNET Control command\n");
 522                     return -1;
 523                 }
 524             } else if (queue_idx == 1) {
 525                 if (handle_pkt_kick(core, vnet_state) == -1){
 526                     PrintError("Could not handle Virtio VNET TX\n");
 527                     return -1;
 528                 }
 529                 vnet_state->tx_exit ++;
 530                 //PrintError("Notify on TX\n");
 531             } else if (queue_idx == 2) {
 532                 if (handle_rx_kick(core, vnet_state) == -1){
 533                     PrintError("Could not handle Virtio RX buffer refills Kick\n");
 534                     return -1;
 535                 }
 536                 vnet_state->rx_exit ++;
 537             } else {
 538                 PrintError("VNET Bridge: Kick on invalid queue (%d)\n", queue_idx);
 539                 return -1;
 540             }
 541
 542             break;
 543         }
 544         case VIRTIO_STATUS_PORT:
 545             vnet_state->virtio_cfg.status = *(uint8_t *)src;
 546
 547             if (vnet_state->virtio_cfg.status == 0) {
 548                 PrintDebug("VNET Bridge: Resetting device\n");
 549                 virtio_reset(vnet_state);
 550             }
 551
 552             break;
 553
 554         case VIRTIO_ISR_PORT:
 555             vnet_state->virtio_cfg.pci_isr = *(uint8_t *)src;
 556             break;
 557         default:
 558             return -1;
 559             break;
 560     }
 561
 562     return length;
 563 }
 564
 565
 566 static int vnet_virtio_io_read(struct guest_info * core, uint16_t port, void * dst, uint_t length, void * private_data) {
 567
 568     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 569     int port_idx = port % vnet_state->io_range_size;
 570
 571     switch (port_idx) {
 572         case HOST_FEATURES_PORT:
 573             if (length != 4) {
 574                 PrintError("Illegal read length for host features\n");
 575                 return -1;
 576             }
 577
 578             *(uint32_t *)dst = vnet_state->virtio_cfg.host_features;
 579
 580             break;
 581         case VRING_PG_NUM_PORT:
 582             if (length != 4) {
 583                 PrintError("Illegal read length for page frame number\n");
 584                 return -1;
 585             }
 586
 587             *(uint32_t *)dst = vnet_state->cur_queue->pfn;
 588
 589             break;
 590         case VRING_SIZE_PORT:
 591             if (length != 2) {
 592                 PrintError("Illegal read length for vring size\n");
 593                 return -1;
 594             }
 595
 596             *(uint16_t *)dst = vnet_state->cur_queue->queue_size;
 597
 598             break;
 599
 600         case VIRTIO_STATUS_PORT:
 601             if (length != 1) {
 602                 PrintError("Illegal read length for status\n");
 603                 return -1;
 604             }
 605
 606             *(uint8_t *)dst = vnet_state->virtio_cfg.status;
 607             break;
 608
 609         case VIRTIO_ISR_PORT:
 610             *(uint8_t *)dst = vnet_state->virtio_cfg.pci_isr;
 611             vnet_state->virtio_cfg.pci_isr = 0;
 612             v3_pci_lower_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 613             break;
 614
 615         default:
 616             if ( (port_idx >= sizeof(struct virtio_config)) &&
 617                  (port_idx < (sizeof(struct virtio_config) + sizeof(struct vnet_config))) ) {
 618                 int cfg_offset = port_idx - sizeof(struct virtio_config);
 619                 uint8_t * cfg_ptr = (uint8_t *)&(vnet_state->vnet_cfg);
 620
 621                 memcpy(dst, cfg_ptr + cfg_offset, length);
 622
 623             } else {
 624                 PrintError("Read of Unhandled Virtio Read\n");
 625                 return -1;
 626             }
 627
 628             break;
 629     }
 630
 631     return length;
 632 }
 633
 634
 635
 636 static struct v3_device_ops dev_ops = {
 637     .free = NULL,
 638     .reset = NULL,
 639     .start = NULL,
 640     .stop = NULL,
 641 };
 642
 643 static int dev_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
 644     struct vm_device * pci_bus = v3_find_dev(vm, v3_cfg_val(cfg, "bus"));
 645     struct virtio_vnet_state * vnet_state = NULL;
 646     struct pci_device * pci_dev = NULL;
 647     char * dev_id = v3_cfg_val(cfg, "ID");
 648
 649     PrintDebug("VNET Bridge: Initializing VNET Bridge Control device: %s\n", dev_id);
 650
 651     if (pci_bus == NULL) {
 652         PrintError("VNET Bridge device require a PCI Bus");
 653         return -1;
 654     }
 655
 656     vnet_state  = (struct virtio_vnet_state *)V3_Malloc(sizeof(struct virtio_vnet_state));
 657     memset(vnet_state, 0, sizeof(struct virtio_vnet_state));
 658
 659     vnet_state->vm = vm;
 660
 661     struct vm_device * dev = v3_allocate_device(dev_id, &dev_ops, vnet_state);
 662
 663     if (v3_attach_device(vm, dev) == -1) {
 664         PrintError("Could not attach device %s\n", dev_id);
 665         return -1;
 666     }
 667
 668
 669     // PCI initialization
 670     {
 671         struct v3_pci_bar bars[6];
 672         int num_ports = sizeof(struct virtio_config) + sizeof(struct vnet_config);
 673         int tmp_ports = num_ports;
 674         int i;
 675
 676         // This gets the number of ports, rounded up to a power of 2
 677         vnet_state->io_range_size = 1; // must be a power of 2
 678
 679         while (tmp_ports > 0) {
 680             tmp_ports >>= 1;
 681             vnet_state->io_range_size <<= 1;
 682         }
 683
 684         // this is to account for any low order bits being set in num_ports
 685         // if there are none, then num_ports was already a power of 2 so we shift right to reset it
 686         if ((num_ports & ((vnet_state->io_range_size >> 1) - 1)) == 0) {
 687             vnet_state->io_range_size >>= 1;
 688         }
 689
 690         for (i = 0; i < 6; i++) {
 691             bars[i].type = PCI_BAR_NONE;
 692         }
 693
 694         bars[0].type = PCI_BAR_IO;
 695         bars[0].default_base_port = -1;
 696         bars[0].num_ports = vnet_state->io_range_size;
 697         bars[0].io_read = vnet_virtio_io_read;
 698         bars[0].io_write = vnet_virtio_io_write;
 699         bars[0].private_data = vnet_state;
 700
 701         pci_dev = v3_pci_register_device(pci_bus, PCI_STD_DEVICE,
 702                                          0, PCI_AUTO_DEV_NUM, 0,
 703                                          "LNX_VIRTIO_VNET", bars,
 704                                          NULL, NULL, NULL, vnet_state);
 705
 706         if (!pci_dev) {
 707             PrintError("Could not register PCI Device\n");
 708             return -1;
 709         }
 710
 711         pci_dev->config_header.vendor_id = VIRTIO_VENDOR_ID;
 712         pci_dev->config_header.subsystem_vendor_id = VIRTIO_SUBVENDOR_ID;
 713         pci_dev->config_header.device_id = VIRTIO_VNET_DEV_ID;
 714         pci_dev->config_header.class = PCI_CLASS_MEMORY;
 715         pci_dev->config_header.subclass = PCI_MEM_SUBCLASS_RAM;
 716         pci_dev->config_header.subsystem_id = VIRTIO_VNET_SUBDEVICE_ID;
 717         pci_dev->config_header.intr_pin = 1;
 718         pci_dev->config_header.max_latency = 1; // ?? (qemu does it...)
 719
 720
 721         vnet_state->pci_dev = pci_dev;
 722         vnet_state->pci_bus = pci_bus;
 723     }
 724
 725     virtio_reset(vnet_state);
 726
 727     V3_Print("Registering Virtio device as vnet bridge\n");
 728     v3_vnet_add_bridge(vm, vnet_pkt_input_cb, vnet_pkt_input_xcall, polling_pkt_from_guest, 0, 500000, (void *)vnet_state);
 729
 730
 731     return 0;
 732 }
 733
 734
 735 device_register("LNX_VIRTIO_VNET", dev_init)