hw/net/spapr_llan.c

   1 /*
   2  * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
   3  *
   4  * PAPR Inter-VM Logical Lan, aka ibmveth
   5  *
   6  * Copyright (c) 2010,2011 David Gibson, IBM Corporation.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24  * THE SOFTWARE.
  25  *
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "cpu.h"
  30 #include "hw/irq.h"
  31 #include "qemu/log.h"
  32 #include "qemu/module.h"
  33 #include "net/net.h"
  34 #include "migration/vmstate.h"
  35 #include "hw/ppc/spapr.h"
  36 #include "hw/ppc/spapr_vio.h"
  37 #include "hw/qdev-properties.h"
  38 #include "sysemu/sysemu.h"
  39 #include "trace.h"
  40
  41 #include <libfdt.h>
  42
  43 #define ETH_ALEN        6
  44 #define MAX_PACKET_SIZE 65536
  45
  46 /* Compatibility flags for migration */
  47 #define SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT  0
  48 #define SPAPRVLAN_FLAG_RX_BUF_POOLS      (1 << SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT)
  49
  50 /*
  51  * Virtual LAN device
  52  */
  53
  54 typedef uint64_t vlan_bd_t;
  55
  56 #define VLAN_BD_VALID        0x8000000000000000ULL
  57 #define VLAN_BD_TOGGLE       0x4000000000000000ULL
  58 #define VLAN_BD_NO_CSUM      0x0200000000000000ULL
  59 #define VLAN_BD_CSUM_GOOD    0x0100000000000000ULL
  60 #define VLAN_BD_LEN_MASK     0x00ffffff00000000ULL
  61 #define VLAN_BD_LEN(bd)      (((bd) & VLAN_BD_LEN_MASK) >> 32)
  62 #define VLAN_BD_ADDR_MASK    0x00000000ffffffffULL
  63 #define VLAN_BD_ADDR(bd)     ((bd) & VLAN_BD_ADDR_MASK)
  64
  65 #define VLAN_VALID_BD(addr, len) (VLAN_BD_VALID | \
  66                                   (((len) << 32) & VLAN_BD_LEN_MASK) |  \
  67                                   (addr & VLAN_BD_ADDR_MASK))
  68
  69 #define VLAN_RXQC_TOGGLE     0x80
  70 #define VLAN_RXQC_VALID      0x40
  71 #define VLAN_RXQC_NO_CSUM    0x02
  72 #define VLAN_RXQC_CSUM_GOOD  0x01
  73
  74 #define VLAN_RQ_ALIGNMENT    16
  75 #define VLAN_RXQ_BD_OFF      0
  76 #define VLAN_FILTER_BD_OFF   8
  77 #define VLAN_RX_BDS_OFF      16
  78 /*
  79  * The final 8 bytes of the buffer list is a counter of frames dropped
  80  * because there was not a buffer in the buffer list capable of holding
  81  * the frame. We must avoid it, or the operating system will report garbage
  82  * for this statistic.
  83  */
  84 #define VLAN_RX_BDS_LEN      (SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF - 8)
  85 #define VLAN_MAX_BUFS        (VLAN_RX_BDS_LEN / 8)
  86
  87 #define TYPE_VIO_SPAPR_VLAN_DEVICE "spapr-vlan"
  88 #define VIO_SPAPR_VLAN_DEVICE(obj) \
  89      OBJECT_CHECK(SpaprVioVlan, (obj), TYPE_VIO_SPAPR_VLAN_DEVICE)
  90
  91 #define RX_POOL_MAX_BDS 4096
  92 #define RX_MAX_POOLS 5
  93
  94 typedef struct {
  95     int32_t bufsize;
  96     int32_t count;
  97     vlan_bd_t bds[RX_POOL_MAX_BDS];
  98 } RxBufPool;
  99
 100 typedef struct SpaprVioVlan {
 101     SpaprVioDevice sdev;
 102     NICConf nicconf;
 103     NICState *nic;
 104     MACAddr perm_mac;
 105     bool isopen;
 106     hwaddr buf_list;
 107     uint32_t add_buf_ptr, use_buf_ptr, rx_bufs;
 108     hwaddr rxq_ptr;
 109     QEMUTimer *rxp_timer;
 110     uint32_t compat_flags;             /* Compatibility flags for migration */
 111     RxBufPool *rx_pool[RX_MAX_POOLS];  /* Receive buffer descriptor pools */
 112 } SpaprVioVlan;
 113
 114 static int spapr_vlan_can_receive(NetClientState *nc)
 115 {
 116     SpaprVioVlan *dev = qemu_get_nic_opaque(nc);
 117
 118     return (dev->isopen && dev->rx_bufs > 0);
 119 }
 120
 121 /**
 122  * The last 8 bytes of the receive buffer list page (that has been
 123  * supplied by the guest with the H_REGISTER_LOGICAL_LAN call) contain
 124  * a counter for frames that have been dropped because there was no
 125  * suitable receive buffer available. This function is used to increase
 126  * this counter by one.
 127  */
 128 static void spapr_vlan_record_dropped_rx_frame(SpaprVioVlan *dev)
 129 {
 130     uint64_t cnt;
 131
 132     cnt = vio_ldq(&dev->sdev, dev->buf_list + 4096 - 8);
 133     vio_stq(&dev->sdev, dev->buf_list + 4096 - 8, cnt + 1);
 134 }
 135
 136 /**
 137  * Get buffer descriptor from one of our receive buffer pools
 138  */
 139 static vlan_bd_t spapr_vlan_get_rx_bd_from_pool(SpaprVioVlan *dev,
 140                                                 size_t size)
 141 {
 142     vlan_bd_t bd;
 143     int pool;
 144
 145     for (pool = 0; pool < RX_MAX_POOLS; pool++) {
 146         if (dev->rx_pool[pool]->count > 0 &&
 147             dev->rx_pool[pool]->bufsize >= size + 8) {
 148             break;
 149         }
 150     }
 151     if (pool == RX_MAX_POOLS) {
 152         /* Failed to find a suitable buffer */
 153         return 0;
 154     }
 155
 156
 157     trace_spapr_vlan_get_rx_bd_from_pool_found(pool,
 158                                                dev->rx_pool[pool]->count,
 159                                                dev->rx_bufs);
 160
 161     /* Remove the buffer from the pool */
 162     dev->rx_pool[pool]->count--;
 163     bd = dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count];
 164     dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count] = 0;
 165
 166     return bd;
 167 }
 168
 169 /**
 170  * Get buffer descriptor from the receive buffer list page that has been
 171  * supplied by the guest with the H_REGISTER_LOGICAL_LAN call
 172  */
 173 static vlan_bd_t spapr_vlan_get_rx_bd_from_page(SpaprVioVlan *dev,
 174                                                 size_t size)
 175 {
 176     int buf_ptr = dev->use_buf_ptr;
 177     vlan_bd_t bd;
 178
 179     do {
 180         buf_ptr += 8;
 181         if (buf_ptr >= VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF) {
 182             buf_ptr = VLAN_RX_BDS_OFF;
 183         }
 184
 185         bd = vio_ldq(&dev->sdev, dev->buf_list + buf_ptr);
 186
 187         trace_spapr_vlan_get_rx_bd_from_page(buf_ptr, (uint64_t)bd);
 188     } while ((!(bd & VLAN_BD_VALID) || VLAN_BD_LEN(bd) < size + 8)
 189              && buf_ptr != dev->use_buf_ptr);
 190
 191     if (!(bd & VLAN_BD_VALID) || VLAN_BD_LEN(bd) < size + 8) {
 192         /* Failed to find a suitable buffer */
 193         return 0;
 194     }
 195
 196     /* Remove the buffer from the pool */
 197     dev->use_buf_ptr = buf_ptr;
 198     vio_stq(&dev->sdev, dev->buf_list + dev->use_buf_ptr, 0);
 199
 200     trace_spapr_vlan_get_rx_bd_from_page_found(dev->use_buf_ptr, dev->rx_bufs);
 201
 202     return bd;
 203 }
 204
 205 static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf,
 206                                   size_t size)
 207 {
 208     SpaprVioVlan *dev = qemu_get_nic_opaque(nc);
 209     SpaprVioDevice *sdev = VIO_SPAPR_DEVICE(dev);
 210     vlan_bd_t rxq_bd = vio_ldq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF);
 211     vlan_bd_t bd;
 212     uint64_t handle;
 213     uint8_t control;
 214
 215     trace_spapr_vlan_receive(sdev->qdev.id, dev->rx_bufs);
 216
 217     if (!dev->isopen) {
 218         return -1;
 219     }
 220
 221     if (!dev->rx_bufs) {
 222         spapr_vlan_record_dropped_rx_frame(dev);
 223         return 0;
 224     }
 225
 226     if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
 227         bd = spapr_vlan_get_rx_bd_from_pool(dev, size);
 228     } else {
 229         bd = spapr_vlan_get_rx_bd_from_page(dev, size);
 230     }
 231     if (!bd) {
 232         spapr_vlan_record_dropped_rx_frame(dev);
 233         return 0;
 234     }
 235
 236     dev->rx_bufs--;
 237
 238     /* Transfer the packet data */
 239     if (spapr_vio_dma_write(sdev, VLAN_BD_ADDR(bd) + 8, buf, size) < 0) {
 240         return -1;
 241     }
 242
 243     trace_spapr_vlan_receive_dma_completed();
 244
 245     /* Update the receive queue */
 246     control = VLAN_RXQC_TOGGLE | VLAN_RXQC_VALID;
 247     if (rxq_bd & VLAN_BD_TOGGLE) {
 248         control ^= VLAN_RXQC_TOGGLE;
 249     }
 250
 251     handle = vio_ldq(sdev, VLAN_BD_ADDR(bd));
 252     vio_stq(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 8, handle);
 253     vio_stl(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 4, size);
 254     vio_sth(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 2, 8);
 255     vio_stb(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr, control);
 256
 257     trace_spapr_vlan_receive_wrote(dev->rxq_ptr,
 258                                    vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) +
 259                                                  dev->rxq_ptr),
 260                                    vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) +
 261                                                  dev->rxq_ptr + 8));
 262
 263     dev->rxq_ptr += 16;
 264     if (dev->rxq_ptr >= VLAN_BD_LEN(rxq_bd)) {
 265         dev->rxq_ptr = 0;
 266         vio_stq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF, rxq_bd ^ VLAN_BD_TOGGLE);
 267     }
 268
 269     if (sdev->signal_state & 1) {
 270         qemu_irq_pulse(spapr_vio_qirq(sdev));
 271     }
 272
 273     return size;
 274 }
 275
 276 static NetClientInfo net_spapr_vlan_info = {
 277     .type = NET_CLIENT_DRIVER_NIC,
 278     .size = sizeof(NICState),
 279     .can_receive = spapr_vlan_can_receive,
 280     .receive = spapr_vlan_receive,
 281 };
 282
 283 static void spapr_vlan_flush_rx_queue(void *opaque)
 284 {
 285     SpaprVioVlan *dev = opaque;
 286
 287     qemu_flush_queued_packets(qemu_get_queue(dev->nic));
 288 }
 289
 290 static void spapr_vlan_reset_rx_pool(RxBufPool *rxp)
 291 {
 292     /*
 293      * Use INT_MAX as bufsize so that unused buffers are moved to the end
 294      * of the list during the qsort in spapr_vlan_add_rxbuf_to_pool() later.
 295      */
 296     rxp->bufsize = INT_MAX;
 297     rxp->count = 0;
 298     memset(rxp->bds, 0, sizeof(rxp->bds));
 299 }
 300
 301 static void spapr_vlan_reset(SpaprVioDevice *sdev)
 302 {
 303     SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 304     int i;
 305
 306     dev->buf_list = 0;
 307     dev->rx_bufs = 0;
 308     dev->isopen = 0;
 309
 310     if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
 311         for (i = 0; i < RX_MAX_POOLS; i++) {
 312             spapr_vlan_reset_rx_pool(dev->rx_pool[i]);
 313         }
 314     }
 315
 316     memcpy(&dev->nicconf.macaddr.a, &dev->perm_mac.a,
 317            sizeof(dev->nicconf.macaddr.a));
 318     qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a);
 319 }
 320
 321 static void spapr_vlan_realize(SpaprVioDevice *sdev, Error **errp)
 322 {
 323     SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 324
 325     qemu_macaddr_default_if_unset(&dev->nicconf.macaddr);
 326
 327     memcpy(&dev->perm_mac.a, &dev->nicconf.macaddr.a, sizeof(dev->perm_mac.a));
 328
 329     dev->nic = qemu_new_nic(&net_spapr_vlan_info, &dev->nicconf,
 330                             object_get_typename(OBJECT(sdev)), sdev->qdev.id, dev);
 331     qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a);
 332
 333     dev->rxp_timer = timer_new_us(QEMU_CLOCK_VIRTUAL, spapr_vlan_flush_rx_queue,
 334                                   dev);
 335 }
 336
 337 static void spapr_vlan_instance_init(Object *obj)
 338 {
 339     SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(obj);
 340     int i;
 341
 342     device_add_bootindex_property(obj, &dev->nicconf.bootindex,
 343                                   "bootindex", "",
 344                                   DEVICE(dev), NULL);
 345
 346     if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
 347         for (i = 0; i < RX_MAX_POOLS; i++) {
 348             dev->rx_pool[i] = g_new(RxBufPool, 1);
 349             spapr_vlan_reset_rx_pool(dev->rx_pool[i]);
 350         }
 351     }
 352 }
 353
 354 static void spapr_vlan_instance_finalize(Object *obj)
 355 {
 356     SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(obj);
 357     int i;
 358
 359     if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
 360         for (i = 0; i < RX_MAX_POOLS; i++) {
 361             g_free(dev->rx_pool[i]);
 362             dev->rx_pool[i] = NULL;
 363         }
 364     }
 365
 366     if (dev->rxp_timer) {
 367         timer_del(dev->rxp_timer);
 368         timer_free(dev->rxp_timer);
 369     }
 370 }
 371
 372 void spapr_vlan_create(SpaprVioBus *bus, NICInfo *nd)
 373 {
 374     DeviceState *dev;
 375
 376     dev = qdev_create(&bus->bus, "spapr-vlan");
 377
 378     qdev_set_nic_properties(dev, nd);
 379
 380     qdev_init_nofail(dev);
 381 }
 382
 383 static int spapr_vlan_devnode(SpaprVioDevice *dev, void *fdt, int node_off)
 384 {
 385     SpaprVioVlan *vdev = VIO_SPAPR_VLAN_DEVICE(dev);
 386     uint8_t padded_mac[8] = {0, 0};
 387     int ret;
 388
 389     /* Some old phyp versions give the mac address in an 8-byte
 390      * property.  The kernel driver (before 3.10) has an insane workaround;
 391      * rather than doing the obvious thing and checking the property
 392      * length, it checks whether the first byte has 0b10 in the low
 393      * bits.  If a correct 6-byte property has a different first byte
 394      * the kernel will get the wrong mac address, overrunning its
 395      * buffer in the process (read only, thank goodness).
 396      *
 397      * Here we return a 6-byte address unless that would break a pre-3.10
 398      * driver.  In that case we return a padded 8-byte address to allow the old
 399      * workaround to succeed. */
 400     if ((vdev->nicconf.macaddr.a[0] & 0x3) == 0x2) {
 401         ret = fdt_setprop(fdt, node_off, "local-mac-address",
 402                           &vdev->nicconf.macaddr, ETH_ALEN);
 403     } else {
 404         memcpy(&padded_mac[2], &vdev->nicconf.macaddr, ETH_ALEN);
 405         ret = fdt_setprop(fdt, node_off, "local-mac-address",
 406                           padded_mac, sizeof(padded_mac));
 407     }
 408     if (ret < 0) {
 409         return ret;
 410     }
 411
 412     ret = fdt_setprop_cell(fdt, node_off, "ibm,mac-address-filters", 0);
 413     if (ret < 0) {
 414         return ret;
 415     }
 416
 417     return 0;
 418 }
 419
 420 static int check_bd(SpaprVioVlan *dev, vlan_bd_t bd,
 421                     target_ulong alignment)
 422 {
 423     if ((VLAN_BD_ADDR(bd) % alignment)
 424         || (VLAN_BD_LEN(bd) % alignment)) {
 425         return -1;
 426     }
 427
 428     if (!spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd),
 429                              VLAN_BD_LEN(bd), DMA_DIRECTION_FROM_DEVICE)
 430         || !spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd),
 431                                 VLAN_BD_LEN(bd), DMA_DIRECTION_TO_DEVICE)) {
 432         return -1;
 433     }
 434
 435     return 0;
 436 }
 437
 438 static target_ulong h_register_logical_lan(PowerPCCPU *cpu,
 439                                            SpaprMachineState *spapr,
 440                                            target_ulong opcode,
 441                                            target_ulong *args)
 442 {
 443     target_ulong reg = args[0];
 444     target_ulong buf_list = args[1];
 445     target_ulong rec_queue = args[2];
 446     target_ulong filter_list = args[3];
 447     SpaprVioDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 448     SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 449     vlan_bd_t filter_list_bd;
 450
 451     if (!dev) {
 452         return H_PARAMETER;
 453     }
 454
 455     if (dev->isopen) {
 456         hcall_dprintf("H_REGISTER_LOGICAL_LAN called twice without "
 457                       "H_FREE_LOGICAL_LAN\n");
 458         return H_RESOURCE;
 459     }
 460
 461     if (check_bd(dev, VLAN_VALID_BD(buf_list, SPAPR_TCE_PAGE_SIZE),
 462                  SPAPR_TCE_PAGE_SIZE) < 0) {
 463         hcall_dprintf("Bad buf_list 0x" TARGET_FMT_lx "\n", buf_list);
 464         return H_PARAMETER;
 465     }
 466
 467     filter_list_bd = VLAN_VALID_BD(filter_list, SPAPR_TCE_PAGE_SIZE);
 468     if (check_bd(dev, filter_list_bd, SPAPR_TCE_PAGE_SIZE) < 0) {
 469         hcall_dprintf("Bad filter_list 0x" TARGET_FMT_lx "\n", filter_list);
 470         return H_PARAMETER;
 471     }
 472
 473     if (!(rec_queue & VLAN_BD_VALID)
 474         || (check_bd(dev, rec_queue, VLAN_RQ_ALIGNMENT) < 0)) {
 475         hcall_dprintf("Bad receive queue\n");
 476         return H_PARAMETER;
 477     }
 478
 479     dev->buf_list = buf_list;
 480     sdev->signal_state = 0;
 481
 482     rec_queue &= ~VLAN_BD_TOGGLE;
 483
 484     /* Initialize the buffer list */
 485     vio_stq(sdev, buf_list, rec_queue);
 486     vio_stq(sdev, buf_list + 8, filter_list_bd);
 487     spapr_vio_dma_set(sdev, buf_list + VLAN_RX_BDS_OFF, 0,
 488                       SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF);
 489     dev->add_buf_ptr = VLAN_RX_BDS_OFF - 8;
 490     dev->use_buf_ptr = VLAN_RX_BDS_OFF - 8;
 491     dev->rx_bufs = 0;
 492     dev->rxq_ptr = 0;
 493
 494     /* Initialize the receive queue */
 495     spapr_vio_dma_set(sdev, VLAN_BD_ADDR(rec_queue), 0, VLAN_BD_LEN(rec_queue));
 496
 497     dev->isopen = 1;
 498     qemu_flush_queued_packets(qemu_get_queue(dev->nic));
 499
 500     return H_SUCCESS;
 501 }
 502
 503
 504 static target_ulong h_free_logical_lan(PowerPCCPU *cpu,
 505                                        SpaprMachineState *spapr,
 506                                        target_ulong opcode, target_ulong *args)
 507 {
 508     target_ulong reg = args[0];
 509     SpaprVioDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 510     SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 511
 512     if (!dev) {
 513         return H_PARAMETER;
 514     }
 515
 516     if (!dev->isopen) {
 517         hcall_dprintf("H_FREE_LOGICAL_LAN called without "
 518                       "H_REGISTER_LOGICAL_LAN\n");
 519         return H_RESOURCE;
 520     }
 521
 522     spapr_vlan_reset(sdev);
 523     return H_SUCCESS;
 524 }
 525
 526 /**
 527  * Used for qsort, this function compares two RxBufPools by size.
 528  */
 529 static int rx_pool_size_compare(const void *p1, const void *p2)
 530 {
 531     const RxBufPool *pool1 = *(RxBufPool **)p1;
 532     const RxBufPool *pool2 = *(RxBufPool **)p2;
 533
 534     if (pool1->bufsize < pool2->bufsize) {
 535         return -1;
 536     }
 537     return pool1->bufsize > pool2->bufsize;
 538 }
 539
 540 /**
 541  * Search for a matching buffer pool with exact matching size,
 542  * or return -1 if no matching pool has been found.
 543  */
 544 static int spapr_vlan_get_rx_pool_id(SpaprVioVlan *dev, int size)
 545 {
 546     int pool;
 547
 548     for (pool = 0; pool < RX_MAX_POOLS; pool++) {
 549         if (dev->rx_pool[pool]->bufsize == size) {
 550             return pool;
 551         }
 552     }
 553
 554     return -1;
 555 }
 556
 557 /**
 558  * Enqueuing receive buffer by adding it to one of our receive buffer pools
 559  */
 560 static target_long spapr_vlan_add_rxbuf_to_pool(SpaprVioVlan *dev,
 561                                                 target_ulong buf)
 562 {
 563     int size = VLAN_BD_LEN(buf);
 564     int pool;
 565
 566     pool = spapr_vlan_get_rx_pool_id(dev, size);
 567     if (pool < 0) {
 568         /*
 569          * No matching pool found? Try to use a new one. If the guest used all
 570          * pools before, but changed the size of one pool in the meantime, we might
 571          * need to recycle that pool here (if it's empty already). Thus scan
 572          * all buffer pools now, starting with the last (likely empty) one.
 573          */
 574         for (pool = RX_MAX_POOLS - 1; pool >= 0 ; pool--) {
 575             if (dev->rx_pool[pool]->count == 0) {
 576                 dev->rx_pool[pool]->bufsize = size;
 577                 /*
 578                  * Sort pools by size so that spapr_vlan_receive()
 579                  * can later find the smallest buffer pool easily.
 580                  */
 581                 qsort(dev->rx_pool, RX_MAX_POOLS, sizeof(dev->rx_pool[0]),
 582                       rx_pool_size_compare);
 583                 pool = spapr_vlan_get_rx_pool_id(dev, size);
 584                 trace_spapr_vlan_add_rxbuf_to_pool_create(pool,
 585                                                           VLAN_BD_LEN(buf));
 586                 break;
 587             }
 588         }
 589     }
 590     /* Still no usable pool? Give up */
 591     if (pool < 0 || dev->rx_pool[pool]->count >= RX_POOL_MAX_BDS) {
 592         return H_RESOURCE;
 593     }
 594
 595     trace_spapr_vlan_add_rxbuf_to_pool(pool, VLAN_BD_LEN(buf),
 596                                        dev->rx_pool[pool]->count);
 597
 598     dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count++] = buf;
 599
 600     return 0;
 601 }
 602
 603 /**
 604  * This is the old way of enqueuing receive buffers: Add it to the rx queue
 605  * page that has been supplied by the guest (which is quite limited in size).
 606  */
 607 static target_long spapr_vlan_add_rxbuf_to_page(SpaprVioVlan *dev,
 608                                                 target_ulong buf)
 609 {
 610     vlan_bd_t bd;
 611
 612     if (dev->rx_bufs >= VLAN_MAX_BUFS) {
 613         return H_RESOURCE;
 614     }
 615
 616     do {
 617         dev->add_buf_ptr += 8;
 618         if (dev->add_buf_ptr >= VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF) {
 619             dev->add_buf_ptr = VLAN_RX_BDS_OFF;
 620         }
 621
 622         bd = vio_ldq(&dev->sdev, dev->buf_list + dev->add_buf_ptr);
 623     } while (bd & VLAN_BD_VALID);
 624
 625     vio_stq(&dev->sdev, dev->buf_list + dev->add_buf_ptr, buf);
 626
 627     trace_spapr_vlan_add_rxbuf_to_page(dev->add_buf_ptr, dev->rx_bufs, buf);
 628
 629     return 0;
 630 }
 631
 632 static target_ulong h_add_logical_lan_buffer(PowerPCCPU *cpu,
 633                                              SpaprMachineState *spapr,
 634                                              target_ulong opcode,
 635                                              target_ulong *args)
 636 {
 637     target_ulong reg = args[0];
 638     target_ulong buf = args[1];
 639     SpaprVioDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 640     SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 641     target_long ret;
 642
 643     trace_spapr_vlan_h_add_logical_lan_buffer(reg, buf);
 644
 645     if (!sdev) {
 646         hcall_dprintf("Bad device\n");
 647         return H_PARAMETER;
 648     }
 649
 650     if ((check_bd(dev, buf, 4) < 0)
 651         || (VLAN_BD_LEN(buf) < 16)) {
 652         hcall_dprintf("Bad buffer enqueued\n");
 653         return H_PARAMETER;
 654     }
 655
 656     if (!dev->isopen) {
 657         return H_RESOURCE;
 658     }
 659
 660     if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
 661         ret = spapr_vlan_add_rxbuf_to_pool(dev, buf);
 662     } else {
 663         ret = spapr_vlan_add_rxbuf_to_page(dev, buf);
 664     }
 665     if (ret) {
 666         return ret;
 667     }
 668
 669     dev->rx_bufs++;
 670
 671     /*
 672      * Give guest some more time to add additional RX buffers before we
 673      * flush the receive queue, so that e.g. fragmented IP packets can
 674      * be passed to the guest in one go later (instead of passing single
 675      * fragments if there is only one receive buffer available).
 676      */
 677     timer_mod(dev->rxp_timer, qemu_clock_get_us(QEMU_CLOCK_VIRTUAL) + 500);
 678
 679     return H_SUCCESS;
 680 }
 681
 682 static target_ulong h_send_logical_lan(PowerPCCPU *cpu,
 683                                        SpaprMachineState *spapr,
 684                                        target_ulong opcode, target_ulong *args)
 685 {
 686     target_ulong reg = args[0];
 687     target_ulong *bufs = args + 1;
 688     target_ulong continue_token = args[7];
 689     SpaprVioDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 690     SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 691     unsigned total_len;
 692     uint8_t *lbuf, *p;
 693     int i, nbufs;
 694     int ret;
 695
 696     trace_spapr_vlan_h_send_logical_lan(reg, continue_token);
 697
 698     if (!sdev) {
 699         return H_PARAMETER;
 700     }
 701
 702     trace_spapr_vlan_h_send_logical_lan_rxbufs(dev->rx_bufs);
 703
 704     if (!dev->isopen) {
 705         return H_DROPPED;
 706     }
 707
 708     if (continue_token) {
 709         return H_HARDWARE; /* FIXME actually handle this */
 710     }
 711
 712     total_len = 0;
 713     for (i = 0; i < 6; i++) {
 714         trace_spapr_vlan_h_send_logical_lan_buf_desc(bufs[i]);
 715         if (!(bufs[i] & VLAN_BD_VALID)) {
 716             break;
 717         }
 718         total_len += VLAN_BD_LEN(bufs[i]);
 719     }
 720
 721     nbufs = i;
 722     trace_spapr_vlan_h_send_logical_lan_total(nbufs, total_len);
 723
 724     if (total_len == 0) {
 725         return H_SUCCESS;
 726     }
 727
 728     if (total_len > MAX_PACKET_SIZE) {
 729         /* Don't let the guest force too large an allocation */
 730         return H_RESOURCE;
 731     }
 732
 733     lbuf = alloca(total_len);
 734     p = lbuf;
 735     for (i = 0; i < nbufs; i++) {
 736         ret = spapr_vio_dma_read(sdev, VLAN_BD_ADDR(bufs[i]),
 737                                  p, VLAN_BD_LEN(bufs[i]));
 738         if (ret < 0) {
 739             return ret;
 740         }
 741
 742         p += VLAN_BD_LEN(bufs[i]);
 743     }
 744
 745     qemu_send_packet(qemu_get_queue(dev->nic), lbuf, total_len);
 746
 747     return H_SUCCESS;
 748 }
 749
 750 static target_ulong h_multicast_ctrl(PowerPCCPU *cpu, SpaprMachineState *spapr,
 751                                      target_ulong opcode, target_ulong *args)
 752 {
 753     target_ulong reg = args[0];
 754     SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 755
 756     if (!dev) {
 757         return H_PARAMETER;
 758     }
 759
 760     return H_SUCCESS;
 761 }
 762
 763 static target_ulong h_change_logical_lan_mac(PowerPCCPU *cpu,
 764                                              SpaprMachineState *spapr,
 765                                              target_ulong opcode,
 766                                              target_ulong *args)
 767 {
 768     target_ulong reg = args[0];
 769     target_ulong macaddr = args[1];
 770     SpaprVioDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 771     SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 772     int i;
 773
 774     for (i = 0; i < ETH_ALEN; i++) {
 775         dev->nicconf.macaddr.a[ETH_ALEN - i - 1] = macaddr & 0xff;
 776         macaddr >>= 8;
 777     }
 778
 779     qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a);
 780
 781     return H_SUCCESS;
 782 }
 783
 784 static Property spapr_vlan_properties[] = {
 785     DEFINE_SPAPR_PROPERTIES(SpaprVioVlan, sdev),
 786     DEFINE_NIC_PROPERTIES(SpaprVioVlan, nicconf),
 787     DEFINE_PROP_BIT("use-rx-buffer-pools", SpaprVioVlan,
 788                     compat_flags, SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT, true),
 789     DEFINE_PROP_END_OF_LIST(),
 790 };
 791
 792 static bool spapr_vlan_rx_buffer_pools_needed(void *opaque)
 793 {
 794     SpaprVioVlan *dev = opaque;
 795
 796     return (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) != 0;
 797 }
 798
 799 static const VMStateDescription vmstate_rx_buffer_pool = {
 800     .name = "spapr_llan/rx_buffer_pool",
 801     .version_id = 1,
 802     .minimum_version_id = 1,
 803     .needed = spapr_vlan_rx_buffer_pools_needed,
 804     .fields = (VMStateField[]) {
 805         VMSTATE_INT32(bufsize, RxBufPool),
 806         VMSTATE_INT32(count, RxBufPool),
 807         VMSTATE_UINT64_ARRAY(bds, RxBufPool, RX_POOL_MAX_BDS),
 808         VMSTATE_END_OF_LIST()
 809     }
 810 };
 811
 812 static const VMStateDescription vmstate_rx_pools = {
 813     .name = "spapr_llan/rx_pools",
 814     .version_id = 1,
 815     .minimum_version_id = 1,
 816     .needed = spapr_vlan_rx_buffer_pools_needed,
 817     .fields = (VMStateField[]) {
 818         VMSTATE_ARRAY_OF_POINTER_TO_STRUCT(rx_pool, SpaprVioVlan,
 819                                            RX_MAX_POOLS, 1,
 820                                            vmstate_rx_buffer_pool, RxBufPool),
 821         VMSTATE_END_OF_LIST()
 822     }
 823 };
 824
 825 static const VMStateDescription vmstate_spapr_llan = {
 826     .name = "spapr_llan",
 827     .version_id = 1,
 828     .minimum_version_id = 1,
 829     .fields = (VMStateField[]) {
 830         VMSTATE_SPAPR_VIO(sdev, SpaprVioVlan),
 831         /* LLAN state */
 832         VMSTATE_BOOL(isopen, SpaprVioVlan),
 833         VMSTATE_UINT64(buf_list, SpaprVioVlan),
 834         VMSTATE_UINT32(add_buf_ptr, SpaprVioVlan),
 835         VMSTATE_UINT32(use_buf_ptr, SpaprVioVlan),
 836         VMSTATE_UINT32(rx_bufs, SpaprVioVlan),
 837         VMSTATE_UINT64(rxq_ptr, SpaprVioVlan),
 838
 839         VMSTATE_END_OF_LIST()
 840     },
 841     .subsections = (const VMStateDescription * []) {
 842         &vmstate_rx_pools,
 843         NULL
 844     }
 845 };
 846
 847 static void spapr_vlan_class_init(ObjectClass *klass, void *data)
 848 {
 849     DeviceClass *dc = DEVICE_CLASS(klass);
 850     SpaprVioDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
 851
 852     k->realize = spapr_vlan_realize;
 853     k->reset = spapr_vlan_reset;
 854     k->devnode = spapr_vlan_devnode;
 855     k->dt_name = "l-lan";
 856     k->dt_type = "network";
 857     k->dt_compatible = "IBM,l-lan";
 858     k->signal_mask = 0x1;
 859     set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
 860     dc->props = spapr_vlan_properties;
 861     k->rtce_window_size = 0x10000000;
 862     dc->vmsd = &vmstate_spapr_llan;
 863 }
 864
 865 static const TypeInfo spapr_vlan_info = {
 866     .name          = TYPE_VIO_SPAPR_VLAN_DEVICE,
 867     .parent        = TYPE_VIO_SPAPR_DEVICE,
 868     .instance_size = sizeof(SpaprVioVlan),
 869     .class_init    = spapr_vlan_class_init,
 870     .instance_init = spapr_vlan_instance_init,
 871     .instance_finalize = spapr_vlan_instance_finalize,
 872 };
 873
 874 static void spapr_vlan_register_types(void)
 875 {
 876     spapr_register_hypercall(H_REGISTER_LOGICAL_LAN, h_register_logical_lan);
 877     spapr_register_hypercall(H_FREE_LOGICAL_LAN, h_free_logical_lan);
 878     spapr_register_hypercall(H_SEND_LOGICAL_LAN, h_send_logical_lan);
 879     spapr_register_hypercall(H_ADD_LOGICAL_LAN_BUFFER,
 880                              h_add_logical_lan_buffer);
 881     spapr_register_hypercall(H_MULTICAST_CTRL, h_multicast_ctrl);
 882     spapr_register_hypercall(H_CHANGE_LOGICAL_LAN_MAC,
 883                              h_change_logical_lan_mac);
 884     type_register_static(&spapr_vlan_info);
 885 }
 886
 887 type_init(spapr_vlan_register_types)