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 #include "qemu/osdep.h"
  28 #include "qemu-common.h"
  29 #include "cpu.h"
  30 #include "hw/hw.h"
  31 #include "net/net.h"
  32 #include "hw/qdev.h"
  33 #include "hw/ppc/spapr.h"
  34 #include "hw/ppc/spapr_vio.h"
  35 #include "sysemu/sysemu.h"
  36
  37 #include <libfdt.h>
  38
  39 #define ETH_ALEN        6
  40 #define MAX_PACKET_SIZE 65536
  41
  42 /*#define DEBUG*/
  43
  44 #ifdef DEBUG
  45 #define DPRINTF(fmt...) do { fprintf(stderr, fmt); } while (0)
  46 #else
  47 #define DPRINTF(fmt...)
  48 #endif
  49
  50 /* Compatibility flags for migration */
  51 #define SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT  0
  52 #define SPAPRVLAN_FLAG_RX_BUF_POOLS      (1 << SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT)
  53
  54 /*
  55  * Virtual LAN device
  56  */
  57
  58 typedef uint64_t vlan_bd_t;
  59
  60 #define VLAN_BD_VALID        0x8000000000000000ULL
  61 #define VLAN_BD_TOGGLE       0x4000000000000000ULL
  62 #define VLAN_BD_NO_CSUM      0x0200000000000000ULL
  63 #define VLAN_BD_CSUM_GOOD    0x0100000000000000ULL
  64 #define VLAN_BD_LEN_MASK     0x00ffffff00000000ULL
  65 #define VLAN_BD_LEN(bd)      (((bd) & VLAN_BD_LEN_MASK) >> 32)
  66 #define VLAN_BD_ADDR_MASK    0x00000000ffffffffULL
  67 #define VLAN_BD_ADDR(bd)     ((bd) & VLAN_BD_ADDR_MASK)
  68
  69 #define VLAN_VALID_BD(addr, len) (VLAN_BD_VALID | \
  70                                   (((len) << 32) & VLAN_BD_LEN_MASK) |  \
  71                                   (addr & VLAN_BD_ADDR_MASK))
  72
  73 #define VLAN_RXQC_TOGGLE     0x80
  74 #define VLAN_RXQC_VALID      0x40
  75 #define VLAN_RXQC_NO_CSUM    0x02
  76 #define VLAN_RXQC_CSUM_GOOD  0x01
  77
  78 #define VLAN_RQ_ALIGNMENT    16
  79 #define VLAN_RXQ_BD_OFF      0
  80 #define VLAN_FILTER_BD_OFF   8
  81 #define VLAN_RX_BDS_OFF      16
  82 /*
  83  * The final 8 bytes of the buffer list is a counter of frames dropped
  84  * because there was not a buffer in the buffer list capable of holding
  85  * the frame. We must avoid it, or the operating system will report garbage
  86  * for this statistic.
  87  */
  88 #define VLAN_RX_BDS_LEN      (SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF - 8)
  89 #define VLAN_MAX_BUFS        (VLAN_RX_BDS_LEN / 8)
  90
  91 #define TYPE_VIO_SPAPR_VLAN_DEVICE "spapr-vlan"
  92 #define VIO_SPAPR_VLAN_DEVICE(obj) \
  93      OBJECT_CHECK(VIOsPAPRVLANDevice, (obj), TYPE_VIO_SPAPR_VLAN_DEVICE)
  94
  95 #define RX_POOL_MAX_BDS 4096
  96 #define RX_MAX_POOLS 5
  97
  98 typedef struct {
  99     int32_t bufsize;
 100     int32_t count;
 101     vlan_bd_t bds[RX_POOL_MAX_BDS];
 102 } RxBufPool;
 103
 104 typedef struct VIOsPAPRVLANDevice {
 105     VIOsPAPRDevice sdev;
 106     NICConf nicconf;
 107     NICState *nic;
 108     bool isopen;
 109     target_ulong buf_list;
 110     uint32_t add_buf_ptr, use_buf_ptr, rx_bufs;
 111     target_ulong rxq_ptr;
 112     uint32_t compat_flags;             /* Compatability flags for migration */
 113     RxBufPool *rx_pool[RX_MAX_POOLS];  /* Receive buffer descriptor pools */
 114 } VIOsPAPRVLANDevice;
 115
 116 static int spapr_vlan_can_receive(NetClientState *nc)
 117 {
 118     VIOsPAPRVLANDevice *dev = qemu_get_nic_opaque(nc);
 119
 120     return (dev->isopen && dev->rx_bufs > 0);
 121 }
 122
 123 /**
 124  * Get buffer descriptor from one of our receive buffer pools
 125  */
 126 static vlan_bd_t spapr_vlan_get_rx_bd_from_pool(VIOsPAPRVLANDevice *dev,
 127                                                 size_t size)
 128 {
 129     vlan_bd_t bd;
 130     int pool;
 131
 132     for (pool = 0; pool < RX_MAX_POOLS; pool++) {
 133         if (dev->rx_pool[pool]->count > 0 &&
 134             dev->rx_pool[pool]->bufsize >= size + 8) {
 135             break;
 136         }
 137     }
 138     if (pool == RX_MAX_POOLS) {
 139         /* Failed to find a suitable buffer */
 140         return 0;
 141     }
 142
 143     DPRINTF("Found buffer: pool=%d count=%d rxbufs=%d\n", pool,
 144             dev->rx_pool[pool]->count, dev->rx_bufs);
 145
 146     /* Remove the buffer from the pool */
 147     dev->rx_pool[pool]->count--;
 148     bd = dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count];
 149     dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count] = 0;
 150
 151     return bd;
 152 }
 153
 154 /**
 155  * Get buffer descriptor from the receive buffer list page that has been
 156  * supplied by the guest with the H_REGISTER_LOGICAL_LAN call
 157  */
 158 static vlan_bd_t spapr_vlan_get_rx_bd_from_page(VIOsPAPRVLANDevice *dev,
 159                                                 size_t size)
 160 {
 161     int buf_ptr = dev->use_buf_ptr;
 162     vlan_bd_t bd;
 163
 164     do {
 165         buf_ptr += 8;
 166         if (buf_ptr >= VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF) {
 167             buf_ptr = VLAN_RX_BDS_OFF;
 168         }
 169
 170         bd = vio_ldq(&dev->sdev, dev->buf_list + buf_ptr);
 171         DPRINTF("use_buf_ptr=%d bd=0x%016llx\n",
 172                 buf_ptr, (unsigned long long)bd);
 173     } while ((!(bd & VLAN_BD_VALID) || VLAN_BD_LEN(bd) < size + 8)
 174              && buf_ptr != dev->use_buf_ptr);
 175
 176     if (!(bd & VLAN_BD_VALID) || VLAN_BD_LEN(bd) < size + 8) {
 177         /* Failed to find a suitable buffer */
 178         return 0;
 179     }
 180
 181     /* Remove the buffer from the pool */
 182     dev->use_buf_ptr = buf_ptr;
 183     vio_stq(&dev->sdev, dev->buf_list + dev->use_buf_ptr, 0);
 184
 185     DPRINTF("Found buffer: ptr=%d rxbufs=%d\n", dev->use_buf_ptr, dev->rx_bufs);
 186
 187     return bd;
 188 }
 189
 190 static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf,
 191                                   size_t size)
 192 {
 193     VIOsPAPRVLANDevice *dev = qemu_get_nic_opaque(nc);
 194     VIOsPAPRDevice *sdev = VIO_SPAPR_DEVICE(dev);
 195     vlan_bd_t rxq_bd = vio_ldq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF);
 196     vlan_bd_t bd;
 197     uint64_t handle;
 198     uint8_t control;
 199
 200     DPRINTF("spapr_vlan_receive() [%s] rx_bufs=%d\n", sdev->qdev.id,
 201             dev->rx_bufs);
 202
 203     if (!dev->isopen) {
 204         return -1;
 205     }
 206
 207     if (!dev->rx_bufs) {
 208         return -1;
 209     }
 210
 211     if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
 212         bd = spapr_vlan_get_rx_bd_from_pool(dev, size);
 213     } else {
 214         bd = spapr_vlan_get_rx_bd_from_page(dev, size);
 215     }
 216     if (!bd) {
 217         return -1;
 218     }
 219
 220     dev->rx_bufs--;
 221
 222     /* Transfer the packet data */
 223     if (spapr_vio_dma_write(sdev, VLAN_BD_ADDR(bd) + 8, buf, size) < 0) {
 224         return -1;
 225     }
 226
 227     DPRINTF("spapr_vlan_receive: DMA write completed\n");
 228
 229     /* Update the receive queue */
 230     control = VLAN_RXQC_TOGGLE | VLAN_RXQC_VALID;
 231     if (rxq_bd & VLAN_BD_TOGGLE) {
 232         control ^= VLAN_RXQC_TOGGLE;
 233     }
 234
 235     handle = vio_ldq(sdev, VLAN_BD_ADDR(bd));
 236     vio_stq(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 8, handle);
 237     vio_stl(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 4, size);
 238     vio_sth(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 2, 8);
 239     vio_stb(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr, control);
 240
 241     DPRINTF("wrote rxq entry (ptr=0x%llx): 0x%016llx 0x%016llx\n",
 242             (unsigned long long)dev->rxq_ptr,
 243             (unsigned long long)vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) +
 244                                         dev->rxq_ptr),
 245             (unsigned long long)vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) +
 246                                         dev->rxq_ptr + 8));
 247
 248     dev->rxq_ptr += 16;
 249     if (dev->rxq_ptr >= VLAN_BD_LEN(rxq_bd)) {
 250         dev->rxq_ptr = 0;
 251         vio_stq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF, rxq_bd ^ VLAN_BD_TOGGLE);
 252     }
 253
 254     if (sdev->signal_state & 1) {
 255         qemu_irq_pulse(spapr_vio_qirq(sdev));
 256     }
 257
 258     return size;
 259 }
 260
 261 static NetClientInfo net_spapr_vlan_info = {
 262     .type = NET_CLIENT_OPTIONS_KIND_NIC,
 263     .size = sizeof(NICState),
 264     .can_receive = spapr_vlan_can_receive,
 265     .receive = spapr_vlan_receive,
 266 };
 267
 268 static void spapr_vlan_reset_rx_pool(RxBufPool *rxp)
 269 {
 270     /*
 271      * Use INT_MAX as bufsize so that unused buffers are moved to the end
 272      * of the list during the qsort in spapr_vlan_add_rxbuf_to_pool() later.
 273      */
 274     rxp->bufsize = INT_MAX;
 275     rxp->count = 0;
 276     memset(rxp->bds, 0, sizeof(rxp->bds));
 277 }
 278
 279 static void spapr_vlan_reset(VIOsPAPRDevice *sdev)
 280 {
 281     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 282     int i;
 283
 284     dev->buf_list = 0;
 285     dev->rx_bufs = 0;
 286     dev->isopen = 0;
 287
 288     if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
 289         for (i = 0; i < RX_MAX_POOLS; i++) {
 290             spapr_vlan_reset_rx_pool(dev->rx_pool[i]);
 291         }
 292     }
 293 }
 294
 295 static void spapr_vlan_realize(VIOsPAPRDevice *sdev, Error **errp)
 296 {
 297     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 298
 299     qemu_macaddr_default_if_unset(&dev->nicconf.macaddr);
 300
 301     dev->nic = qemu_new_nic(&net_spapr_vlan_info, &dev->nicconf,
 302                             object_get_typename(OBJECT(sdev)), sdev->qdev.id, dev);
 303     qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a);
 304 }
 305
 306 static void spapr_vlan_instance_init(Object *obj)
 307 {
 308     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(obj);
 309     int i;
 310
 311     device_add_bootindex_property(obj, &dev->nicconf.bootindex,
 312                                   "bootindex", "",
 313                                   DEVICE(dev), NULL);
 314
 315     if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
 316         for (i = 0; i < RX_MAX_POOLS; i++) {
 317             dev->rx_pool[i] = g_new(RxBufPool, 1);
 318             spapr_vlan_reset_rx_pool(dev->rx_pool[i]);
 319         }
 320     }
 321 }
 322
 323 static void spapr_vlan_instance_finalize(Object *obj)
 324 {
 325     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(obj);
 326     int i;
 327
 328     if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
 329         for (i = 0; i < RX_MAX_POOLS; i++) {
 330             g_free(dev->rx_pool[i]);
 331             dev->rx_pool[i] = NULL;
 332         }
 333     }
 334 }
 335
 336 void spapr_vlan_create(VIOsPAPRBus *bus, NICInfo *nd)
 337 {
 338     DeviceState *dev;
 339
 340     dev = qdev_create(&bus->bus, "spapr-vlan");
 341
 342     qdev_set_nic_properties(dev, nd);
 343
 344     qdev_init_nofail(dev);
 345 }
 346
 347 static int spapr_vlan_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)
 348 {
 349     VIOsPAPRVLANDevice *vdev = VIO_SPAPR_VLAN_DEVICE(dev);
 350     uint8_t padded_mac[8] = {0, 0};
 351     int ret;
 352
 353     /* Some old phyp versions give the mac address in an 8-byte
 354      * property.  The kernel driver has an insane workaround for this;
 355      * rather than doing the obvious thing and checking the property
 356      * length, it checks whether the first byte has 0b10 in the low
 357      * bits.  If a correct 6-byte property has a different first byte
 358      * the kernel will get the wrong mac address, overrunning its
 359      * buffer in the process (read only, thank goodness).
 360      *
 361      * Here we workaround the kernel workaround by always supplying an
 362      * 8-byte property, with the mac address in the last six bytes */
 363     memcpy(&padded_mac[2], &vdev->nicconf.macaddr, ETH_ALEN);
 364     ret = fdt_setprop(fdt, node_off, "local-mac-address",
 365                       padded_mac, sizeof(padded_mac));
 366     if (ret < 0) {
 367         return ret;
 368     }
 369
 370     ret = fdt_setprop_cell(fdt, node_off, "ibm,mac-address-filters", 0);
 371     if (ret < 0) {
 372         return ret;
 373     }
 374
 375     return 0;
 376 }
 377
 378 static int check_bd(VIOsPAPRVLANDevice *dev, vlan_bd_t bd,
 379                     target_ulong alignment)
 380 {
 381     if ((VLAN_BD_ADDR(bd) % alignment)
 382         || (VLAN_BD_LEN(bd) % alignment)) {
 383         return -1;
 384     }
 385
 386     if (!spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd),
 387                              VLAN_BD_LEN(bd), DMA_DIRECTION_FROM_DEVICE)
 388         || !spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd),
 389                                 VLAN_BD_LEN(bd), DMA_DIRECTION_TO_DEVICE)) {
 390         return -1;
 391     }
 392
 393     return 0;
 394 }
 395
 396 static target_ulong h_register_logical_lan(PowerPCCPU *cpu,
 397                                            sPAPRMachineState *spapr,
 398                                            target_ulong opcode,
 399                                            target_ulong *args)
 400 {
 401     target_ulong reg = args[0];
 402     target_ulong buf_list = args[1];
 403     target_ulong rec_queue = args[2];
 404     target_ulong filter_list = args[3];
 405     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 406     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 407     vlan_bd_t filter_list_bd;
 408
 409     if (!dev) {
 410         return H_PARAMETER;
 411     }
 412
 413     if (dev->isopen) {
 414         hcall_dprintf("H_REGISTER_LOGICAL_LAN called twice without "
 415                       "H_FREE_LOGICAL_LAN\n");
 416         return H_RESOURCE;
 417     }
 418
 419     if (check_bd(dev, VLAN_VALID_BD(buf_list, SPAPR_TCE_PAGE_SIZE),
 420                  SPAPR_TCE_PAGE_SIZE) < 0) {
 421         hcall_dprintf("Bad buf_list 0x" TARGET_FMT_lx "\n", buf_list);
 422         return H_PARAMETER;
 423     }
 424
 425     filter_list_bd = VLAN_VALID_BD(filter_list, SPAPR_TCE_PAGE_SIZE);
 426     if (check_bd(dev, filter_list_bd, SPAPR_TCE_PAGE_SIZE) < 0) {
 427         hcall_dprintf("Bad filter_list 0x" TARGET_FMT_lx "\n", filter_list);
 428         return H_PARAMETER;
 429     }
 430
 431     if (!(rec_queue & VLAN_BD_VALID)
 432         || (check_bd(dev, rec_queue, VLAN_RQ_ALIGNMENT) < 0)) {
 433         hcall_dprintf("Bad receive queue\n");
 434         return H_PARAMETER;
 435     }
 436
 437     dev->buf_list = buf_list;
 438     sdev->signal_state = 0;
 439
 440     rec_queue &= ~VLAN_BD_TOGGLE;
 441
 442     /* Initialize the buffer list */
 443     vio_stq(sdev, buf_list, rec_queue);
 444     vio_stq(sdev, buf_list + 8, filter_list_bd);
 445     spapr_vio_dma_set(sdev, buf_list + VLAN_RX_BDS_OFF, 0,
 446                       SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF);
 447     dev->add_buf_ptr = VLAN_RX_BDS_OFF - 8;
 448     dev->use_buf_ptr = VLAN_RX_BDS_OFF - 8;
 449     dev->rx_bufs = 0;
 450     dev->rxq_ptr = 0;
 451
 452     /* Initialize the receive queue */
 453     spapr_vio_dma_set(sdev, VLAN_BD_ADDR(rec_queue), 0, VLAN_BD_LEN(rec_queue));
 454
 455     dev->isopen = 1;
 456     qemu_flush_queued_packets(qemu_get_queue(dev->nic));
 457
 458     return H_SUCCESS;
 459 }
 460
 461
 462 static target_ulong h_free_logical_lan(PowerPCCPU *cpu,
 463                                        sPAPRMachineState *spapr,
 464                                        target_ulong opcode, target_ulong *args)
 465 {
 466     target_ulong reg = args[0];
 467     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 468     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 469
 470     if (!dev) {
 471         return H_PARAMETER;
 472     }
 473
 474     if (!dev->isopen) {
 475         hcall_dprintf("H_FREE_LOGICAL_LAN called without "
 476                       "H_REGISTER_LOGICAL_LAN\n");
 477         return H_RESOURCE;
 478     }
 479
 480     spapr_vlan_reset(sdev);
 481     return H_SUCCESS;
 482 }
 483
 484 /**
 485  * Used for qsort, this function compares two RxBufPools by size.
 486  */
 487 static int rx_pool_size_compare(const void *p1, const void *p2)
 488 {
 489     const RxBufPool *pool1 = *(RxBufPool **)p1;
 490     const RxBufPool *pool2 = *(RxBufPool **)p2;
 491
 492     if (pool1->bufsize < pool2->bufsize) {
 493         return -1;
 494     }
 495     return pool1->bufsize > pool2->bufsize;
 496 }
 497
 498 /**
 499  * Search for a matching buffer pool with exact matching size,
 500  * or return -1 if no matching pool has been found.
 501  */
 502 static int spapr_vlan_get_rx_pool_id(VIOsPAPRVLANDevice *dev, int size)
 503 {
 504     int pool;
 505
 506     for (pool = 0; pool < RX_MAX_POOLS; pool++) {
 507         if (dev->rx_pool[pool]->bufsize == size) {
 508             return pool;
 509         }
 510     }
 511
 512     return -1;
 513 }
 514
 515 /**
 516  * Enqueuing receive buffer by adding it to one of our receive buffer pools
 517  */
 518 static target_long spapr_vlan_add_rxbuf_to_pool(VIOsPAPRVLANDevice *dev,
 519                                                 target_ulong buf)
 520 {
 521     int size = VLAN_BD_LEN(buf);
 522     int pool;
 523
 524     pool = spapr_vlan_get_rx_pool_id(dev, size);
 525     if (pool < 0) {
 526         /*
 527          * No matching pool found? Try to use a new one. If the guest used all
 528          * pools before, but changed the size of one pool inbetween, we might
 529          * need to recycle that pool here (if it's empty already). Thus scan
 530          * all buffer pools now, starting with the last (likely empty) one.
 531          */
 532         for (pool = RX_MAX_POOLS - 1; pool >= 0 ; pool--) {
 533             if (dev->rx_pool[pool]->count == 0) {
 534                 dev->rx_pool[pool]->bufsize = size;
 535                 /*
 536                  * Sort pools by size so that spapr_vlan_receive()
 537                  * can later find the smallest buffer pool easily.
 538                  */
 539                 qsort(dev->rx_pool, RX_MAX_POOLS, sizeof(dev->rx_pool[0]),
 540                       rx_pool_size_compare);
 541                 pool = spapr_vlan_get_rx_pool_id(dev, size);
 542                 DPRINTF("created RX pool %d for size %lld\n", pool,
 543                         VLAN_BD_LEN(buf));
 544                 break;
 545             }
 546         }
 547     }
 548     /* Still no usable pool? Give up */
 549     if (pool < 0 || dev->rx_pool[pool]->count >= RX_POOL_MAX_BDS) {
 550         return H_RESOURCE;
 551     }
 552
 553     DPRINTF("h_add_llan_buf():  Add buf using pool %i (size %lli, count=%i)\n",
 554             pool, VLAN_BD_LEN(buf), dev->rx_pool[pool]->count);
 555
 556     dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count++] = buf;
 557
 558     return 0;
 559 }
 560
 561 /**
 562  * This is the old way of enqueuing receive buffers: Add it to the rx queue
 563  * page that has been supplied by the guest (which is quite limited in size).
 564  */
 565 static target_long spapr_vlan_add_rxbuf_to_page(VIOsPAPRVLANDevice *dev,
 566                                                 target_ulong buf)
 567 {
 568     vlan_bd_t bd;
 569
 570     if (dev->rx_bufs >= VLAN_MAX_BUFS) {
 571         return H_RESOURCE;
 572     }
 573
 574     do {
 575         dev->add_buf_ptr += 8;
 576         if (dev->add_buf_ptr >= VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF) {
 577             dev->add_buf_ptr = VLAN_RX_BDS_OFF;
 578         }
 579
 580         bd = vio_ldq(&dev->sdev, dev->buf_list + dev->add_buf_ptr);
 581     } while (bd & VLAN_BD_VALID);
 582
 583     vio_stq(&dev->sdev, dev->buf_list + dev->add_buf_ptr, buf);
 584
 585     DPRINTF("h_add_llan_buf():  Added buf  ptr=%d  rx_bufs=%d bd=0x%016llx\n",
 586             dev->add_buf_ptr, dev->rx_bufs, (unsigned long long)buf);
 587
 588     return 0;
 589 }
 590
 591 static target_ulong h_add_logical_lan_buffer(PowerPCCPU *cpu,
 592                                              sPAPRMachineState *spapr,
 593                                              target_ulong opcode,
 594                                              target_ulong *args)
 595 {
 596     target_ulong reg = args[0];
 597     target_ulong buf = args[1];
 598     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 599     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 600     target_long ret;
 601
 602     DPRINTF("H_ADD_LOGICAL_LAN_BUFFER(0x" TARGET_FMT_lx
 603             ", 0x" TARGET_FMT_lx ")\n", reg, buf);
 604
 605     if (!sdev) {
 606         hcall_dprintf("Bad device\n");
 607         return H_PARAMETER;
 608     }
 609
 610     if ((check_bd(dev, buf, 4) < 0)
 611         || (VLAN_BD_LEN(buf) < 16)) {
 612         hcall_dprintf("Bad buffer enqueued\n");
 613         return H_PARAMETER;
 614     }
 615
 616     if (!dev->isopen) {
 617         return H_RESOURCE;
 618     }
 619
 620     if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
 621         ret = spapr_vlan_add_rxbuf_to_pool(dev, buf);
 622     } else {
 623         ret = spapr_vlan_add_rxbuf_to_page(dev, buf);
 624     }
 625     if (ret) {
 626         return ret;
 627     }
 628
 629     dev->rx_bufs++;
 630
 631     qemu_flush_queued_packets(qemu_get_queue(dev->nic));
 632
 633     return H_SUCCESS;
 634 }
 635
 636 static target_ulong h_send_logical_lan(PowerPCCPU *cpu,
 637                                        sPAPRMachineState *spapr,
 638                                        target_ulong opcode, target_ulong *args)
 639 {
 640     target_ulong reg = args[0];
 641     target_ulong *bufs = args + 1;
 642     target_ulong continue_token = args[7];
 643     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 644     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 645     unsigned total_len;
 646     uint8_t *lbuf, *p;
 647     int i, nbufs;
 648     int ret;
 649
 650     DPRINTF("H_SEND_LOGICAL_LAN(0x" TARGET_FMT_lx ", <bufs>, 0x"
 651             TARGET_FMT_lx ")\n", reg, continue_token);
 652
 653     if (!sdev) {
 654         return H_PARAMETER;
 655     }
 656
 657     DPRINTF("rxbufs = %d\n", dev->rx_bufs);
 658
 659     if (!dev->isopen) {
 660         return H_DROPPED;
 661     }
 662
 663     if (continue_token) {
 664         return H_HARDWARE; /* FIXME actually handle this */
 665     }
 666
 667     total_len = 0;
 668     for (i = 0; i < 6; i++) {
 669         DPRINTF("   buf desc: 0x" TARGET_FMT_lx "\n", bufs[i]);
 670         if (!(bufs[i] & VLAN_BD_VALID)) {
 671             break;
 672         }
 673         total_len += VLAN_BD_LEN(bufs[i]);
 674     }
 675
 676     nbufs = i;
 677     DPRINTF("h_send_logical_lan() %d buffers, total length 0x%x\n",
 678             nbufs, total_len);
 679
 680     if (total_len == 0) {
 681         return H_SUCCESS;
 682     }
 683
 684     if (total_len > MAX_PACKET_SIZE) {
 685         /* Don't let the guest force too large an allocation */
 686         return H_RESOURCE;
 687     }
 688
 689     lbuf = alloca(total_len);
 690     p = lbuf;
 691     for (i = 0; i < nbufs; i++) {
 692         ret = spapr_vio_dma_read(sdev, VLAN_BD_ADDR(bufs[i]),
 693                                  p, VLAN_BD_LEN(bufs[i]));
 694         if (ret < 0) {
 695             return ret;
 696         }
 697
 698         p += VLAN_BD_LEN(bufs[i]);
 699     }
 700
 701     qemu_send_packet(qemu_get_queue(dev->nic), lbuf, total_len);
 702
 703     return H_SUCCESS;
 704 }
 705
 706 static target_ulong h_multicast_ctrl(PowerPCCPU *cpu, sPAPRMachineState *spapr,
 707                                      target_ulong opcode, target_ulong *args)
 708 {
 709     target_ulong reg = args[0];
 710     VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 711
 712     if (!dev) {
 713         return H_PARAMETER;
 714     }
 715
 716     return H_SUCCESS;
 717 }
 718
 719 static Property spapr_vlan_properties[] = {
 720     DEFINE_SPAPR_PROPERTIES(VIOsPAPRVLANDevice, sdev),
 721     DEFINE_NIC_PROPERTIES(VIOsPAPRVLANDevice, nicconf),
 722     DEFINE_PROP_BIT("use-rx-buffer-pools", VIOsPAPRVLANDevice,
 723                     compat_flags, SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT, true),
 724     DEFINE_PROP_END_OF_LIST(),
 725 };
 726
 727 static bool spapr_vlan_rx_buffer_pools_needed(void *opaque)
 728 {
 729     VIOsPAPRVLANDevice *dev = opaque;
 730
 731     return (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) != 0;
 732 }
 733
 734 static const VMStateDescription vmstate_rx_buffer_pool = {
 735     .name = "spapr_llan/rx_buffer_pool",
 736     .version_id = 1,
 737     .minimum_version_id = 1,
 738     .needed = spapr_vlan_rx_buffer_pools_needed,
 739     .fields = (VMStateField[]) {
 740         VMSTATE_INT32(bufsize, RxBufPool),
 741         VMSTATE_INT32(count, RxBufPool),
 742         VMSTATE_UINT64_ARRAY(bds, RxBufPool, RX_POOL_MAX_BDS),
 743         VMSTATE_END_OF_LIST()
 744     }
 745 };
 746
 747 static const VMStateDescription vmstate_rx_pools = {
 748     .name = "spapr_llan/rx_pools",
 749     .version_id = 1,
 750     .minimum_version_id = 1,
 751     .needed = spapr_vlan_rx_buffer_pools_needed,
 752     .fields = (VMStateField[]) {
 753         VMSTATE_ARRAY_OF_POINTER_TO_STRUCT(rx_pool, VIOsPAPRVLANDevice,
 754                                            RX_MAX_POOLS, 1,
 755                                            vmstate_rx_buffer_pool, RxBufPool),
 756         VMSTATE_END_OF_LIST()
 757     }
 758 };
 759
 760 static const VMStateDescription vmstate_spapr_llan = {
 761     .name = "spapr_llan",
 762     .version_id = 1,
 763     .minimum_version_id = 1,
 764     .fields = (VMStateField[]) {
 765         VMSTATE_SPAPR_VIO(sdev, VIOsPAPRVLANDevice),
 766         /* LLAN state */
 767         VMSTATE_BOOL(isopen, VIOsPAPRVLANDevice),
 768         VMSTATE_UINTTL(buf_list, VIOsPAPRVLANDevice),
 769         VMSTATE_UINT32(add_buf_ptr, VIOsPAPRVLANDevice),
 770         VMSTATE_UINT32(use_buf_ptr, VIOsPAPRVLANDevice),
 771         VMSTATE_UINT32(rx_bufs, VIOsPAPRVLANDevice),
 772         VMSTATE_UINTTL(rxq_ptr, VIOsPAPRVLANDevice),
 773
 774         VMSTATE_END_OF_LIST()
 775     },
 776     .subsections = (const VMStateDescription * []) {
 777         &vmstate_rx_pools,
 778         NULL
 779     }
 780 };
 781
 782 static void spapr_vlan_class_init(ObjectClass *klass, void *data)
 783 {
 784     DeviceClass *dc = DEVICE_CLASS(klass);
 785     VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
 786
 787     k->realize = spapr_vlan_realize;
 788     k->reset = spapr_vlan_reset;
 789     k->devnode = spapr_vlan_devnode;
 790     k->dt_name = "l-lan";
 791     k->dt_type = "network";
 792     k->dt_compatible = "IBM,l-lan";
 793     k->signal_mask = 0x1;
 794     set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
 795     dc->props = spapr_vlan_properties;
 796     k->rtce_window_size = 0x10000000;
 797     dc->vmsd = &vmstate_spapr_llan;
 798 }
 799
 800 static const TypeInfo spapr_vlan_info = {
 801     .name          = TYPE_VIO_SPAPR_VLAN_DEVICE,
 802     .parent        = TYPE_VIO_SPAPR_DEVICE,
 803     .instance_size = sizeof(VIOsPAPRVLANDevice),
 804     .class_init    = spapr_vlan_class_init,
 805     .instance_init = spapr_vlan_instance_init,
 806     .instance_finalize = spapr_vlan_instance_finalize,
 807 };
 808
 809 static void spapr_vlan_register_types(void)
 810 {
 811     spapr_register_hypercall(H_REGISTER_LOGICAL_LAN, h_register_logical_lan);
 812     spapr_register_hypercall(H_FREE_LOGICAL_LAN, h_free_logical_lan);
 813     spapr_register_hypercall(H_SEND_LOGICAL_LAN, h_send_logical_lan);
 814     spapr_register_hypercall(H_ADD_LOGICAL_LAN_BUFFER,
 815                              h_add_logical_lan_buffer);
 816     spapr_register_hypercall(H_MULTICAST_CTRL, h_multicast_ctrl);
 817     type_register_static(&spapr_vlan_info);
 818 }
 819
 820 type_init(spapr_vlan_register_types)