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