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 "qemu/log.h"
  32 #include "net/net.h"
  33 #include "hw/qdev.h"
  34 #include "hw/ppc/spapr.h"
  35 #include "hw/ppc/spapr_vio.h"
  36 #include "sysemu/sysemu.h"
  37
  38 #include <libfdt.h>
  39
  40 #define ETH_ALEN        6
  41 #define MAX_PACKET_SIZE 65536
  42
  43 /*#define DEBUG*/
  44
  45 #ifdef DEBUG
  46 #define DPRINTF(fmt...) do { fprintf(stderr, fmt); } while (0)
  47 #else
  48 #define DPRINTF(fmt...)
  49 #endif
  50
  51 /* Compatibility flags for migration */
  52 #define SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT  0
  53 #define SPAPRVLAN_FLAG_RX_BUF_POOLS      (1 << SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT)
  54
  55 /*
  56  * Virtual LAN device
  57  */
  58
  59 typedef uint64_t vlan_bd_t;
  60
  61 #define VLAN_BD_VALID        0x8000000000000000ULL
  62 #define VLAN_BD_TOGGLE       0x4000000000000000ULL
  63 #define VLAN_BD_NO_CSUM      0x0200000000000000ULL
  64 #define VLAN_BD_CSUM_GOOD    0x0100000000000000ULL
  65 #define VLAN_BD_LEN_MASK     0x00ffffff00000000ULL
  66 #define VLAN_BD_LEN(bd)      (((bd) & VLAN_BD_LEN_MASK) >> 32)
  67 #define VLAN_BD_ADDR_MASK    0x00000000ffffffffULL
  68 #define VLAN_BD_ADDR(bd)     ((bd) & VLAN_BD_ADDR_MASK)
  69
  70 #define VLAN_VALID_BD(addr, len) (VLAN_BD_VALID | \
  71                                   (((len) << 32) & VLAN_BD_LEN_MASK) |  \
  72                                   (addr & VLAN_BD_ADDR_MASK))
  73
  74 #define VLAN_RXQC_TOGGLE     0x80
  75 #define VLAN_RXQC_VALID      0x40
  76 #define VLAN_RXQC_NO_CSUM    0x02
  77 #define VLAN_RXQC_CSUM_GOOD  0x01
  78
  79 #define VLAN_RQ_ALIGNMENT    16
  80 #define VLAN_RXQ_BD_OFF      0
  81 #define VLAN_FILTER_BD_OFF   8
  82 #define VLAN_RX_BDS_OFF      16
  83 /*
  84  * The final 8 bytes of the buffer list is a counter of frames dropped
  85  * because there was not a buffer in the buffer list capable of holding
  86  * the frame. We must avoid it, or the operating system will report garbage
  87  * for this statistic.
  88  */
  89 #define VLAN_RX_BDS_LEN      (SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF - 8)
  90 #define VLAN_MAX_BUFS        (VLAN_RX_BDS_LEN / 8)
  91
  92 #define TYPE_VIO_SPAPR_VLAN_DEVICE "spapr-vlan"
  93 #define VIO_SPAPR_VLAN_DEVICE(obj) \
  94      OBJECT_CHECK(VIOsPAPRVLANDevice, (obj), TYPE_VIO_SPAPR_VLAN_DEVICE)
  95
  96 #define RX_POOL_MAX_BDS 4096
  97 #define RX_MAX_POOLS 5
  98
  99 typedef struct {
 100     int32_t bufsize;
 101     int32_t count;
 102     vlan_bd_t bds[RX_POOL_MAX_BDS];
 103 } RxBufPool;
 104
 105 typedef struct VIOsPAPRVLANDevice {
 106     VIOsPAPRDevice sdev;
 107     NICConf nicconf;
 108     NICState *nic;
 109     MACAddr perm_mac;
 110     bool isopen;
 111     hwaddr buf_list;
 112     uint32_t add_buf_ptr, use_buf_ptr, rx_bufs;
 113     hwaddr rxq_ptr;
 114     QEMUTimer *rxp_timer;
 115     uint32_t compat_flags;             /* Compatability flags for migration */
 116     RxBufPool *rx_pool[RX_MAX_POOLS];  /* Receive buffer descriptor pools */
 117 } VIOsPAPRVLANDevice;
 118
 119 static int spapr_vlan_can_receive(NetClientState *nc)
 120 {
 121     VIOsPAPRVLANDevice *dev = qemu_get_nic_opaque(nc);
 122
 123     return (dev->isopen && dev->rx_bufs > 0);
 124 }
 125
 126 /**
 127  * The last 8 bytes of the receive buffer list page (that has been
 128  * supplied by the guest with the H_REGISTER_LOGICAL_LAN call) contain
 129  * a counter for frames that have been dropped because there was no
 130  * suitable receive buffer available. This function is used to increase
 131  * this counter by one.
 132  */
 133 static void spapr_vlan_record_dropped_rx_frame(VIOsPAPRVLANDevice *dev)
 134 {
 135     uint64_t cnt;
 136
 137     cnt = vio_ldq(&dev->sdev, dev->buf_list + 4096 - 8);
 138     vio_stq(&dev->sdev, dev->buf_list + 4096 - 8, cnt + 1);
 139 }
 140
 141 /**
 142  * Get buffer descriptor from one of our receive buffer pools
 143  */
 144 static vlan_bd_t spapr_vlan_get_rx_bd_from_pool(VIOsPAPRVLANDevice *dev,
 145                                                 size_t size)
 146 {
 147     vlan_bd_t bd;
 148     int pool;
 149
 150     for (pool = 0; pool < RX_MAX_POOLS; pool++) {
 151         if (dev->rx_pool[pool]->count > 0 &&
 152             dev->rx_pool[pool]->bufsize >= size + 8) {
 153             break;
 154         }
 155     }
 156     if (pool == RX_MAX_POOLS) {
 157         /* Failed to find a suitable buffer */
 158         return 0;
 159     }
 160
 161     DPRINTF("Found buffer: pool=%d count=%d rxbufs=%d\n", pool,
 162             dev->rx_pool[pool]->count, dev->rx_bufs);
 163
 164     /* Remove the buffer from the pool */
 165     dev->rx_pool[pool]->count--;
 166     bd = dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count];
 167     dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count] = 0;
 168
 169     return bd;
 170 }
 171
 172 /**
 173  * Get buffer descriptor from the receive buffer list page that has been
 174  * supplied by the guest with the H_REGISTER_LOGICAL_LAN call
 175  */
 176 static vlan_bd_t spapr_vlan_get_rx_bd_from_page(VIOsPAPRVLANDevice *dev,
 177                                                 size_t size)
 178 {
 179     int buf_ptr = dev->use_buf_ptr;
 180     vlan_bd_t bd;
 181
 182     do {
 183         buf_ptr += 8;
 184         if (buf_ptr >= VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF) {
 185             buf_ptr = VLAN_RX_BDS_OFF;
 186         }
 187
 188         bd = vio_ldq(&dev->sdev, dev->buf_list + buf_ptr);
 189         DPRINTF("use_buf_ptr=%d bd=0x%016llx\n",
 190                 buf_ptr, (unsigned long long)bd);
 191     } while ((!(bd & VLAN_BD_VALID) || VLAN_BD_LEN(bd) < size + 8)
 192              && buf_ptr != dev->use_buf_ptr);
 193
 194     if (!(bd & VLAN_BD_VALID) || VLAN_BD_LEN(bd) < size + 8) {
 195         /* Failed to find a suitable buffer */
 196         return 0;
 197     }
 198
 199     /* Remove the buffer from the pool */
 200     dev->use_buf_ptr = buf_ptr;
 201     vio_stq(&dev->sdev, dev->buf_list + dev->use_buf_ptr, 0);
 202
 203     DPRINTF("Found buffer: ptr=%d rxbufs=%d\n", dev->use_buf_ptr, dev->rx_bufs);
 204
 205     return bd;
 206 }
 207
 208 static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf,
 209                                   size_t size)
 210 {
 211     VIOsPAPRVLANDevice *dev = qemu_get_nic_opaque(nc);
 212     VIOsPAPRDevice *sdev = VIO_SPAPR_DEVICE(dev);
 213     vlan_bd_t rxq_bd = vio_ldq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF);
 214     vlan_bd_t bd;
 215     uint64_t handle;
 216     uint8_t control;
 217
 218     DPRINTF("spapr_vlan_receive() [%s] rx_bufs=%d\n", sdev->qdev.id,
 219             dev->rx_bufs);
 220
 221     if (!dev->isopen) {
 222         return -1;
 223     }
 224
 225     if (!dev->rx_bufs) {
 226         spapr_vlan_record_dropped_rx_frame(dev);
 227         return 0;
 228     }
 229
 230     if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
 231         bd = spapr_vlan_get_rx_bd_from_pool(dev, size);
 232     } else {
 233         bd = spapr_vlan_get_rx_bd_from_page(dev, size);
 234     }
 235     if (!bd) {
 236         spapr_vlan_record_dropped_rx_frame(dev);
 237         return 0;
 238     }
 239
 240     dev->rx_bufs--;
 241
 242     /* Transfer the packet data */
 243     if (spapr_vio_dma_write(sdev, VLAN_BD_ADDR(bd) + 8, buf, size) < 0) {
 244         return -1;
 245     }
 246
 247     DPRINTF("spapr_vlan_receive: DMA write completed\n");
 248
 249     /* Update the receive queue */
 250     control = VLAN_RXQC_TOGGLE | VLAN_RXQC_VALID;
 251     if (rxq_bd & VLAN_BD_TOGGLE) {
 252         control ^= VLAN_RXQC_TOGGLE;
 253     }
 254
 255     handle = vio_ldq(sdev, VLAN_BD_ADDR(bd));
 256     vio_stq(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 8, handle);
 257     vio_stl(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 4, size);
 258     vio_sth(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 2, 8);
 259     vio_stb(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr, control);
 260
 261     DPRINTF("wrote rxq entry (ptr=0x%llx): 0x%016llx 0x%016llx\n",
 262             (unsigned long long)dev->rxq_ptr,
 263             (unsigned long long)vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) +
 264                                         dev->rxq_ptr),
 265             (unsigned long long)vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) +
 266                                         dev->rxq_ptr + 8));
 267
 268     dev->rxq_ptr += 16;
 269     if (dev->rxq_ptr >= VLAN_BD_LEN(rxq_bd)) {
 270         dev->rxq_ptr = 0;
 271         vio_stq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF, rxq_bd ^ VLAN_BD_TOGGLE);
 272     }
 273
 274     if (sdev->signal_state & 1) {
 275         qemu_irq_pulse(spapr_vio_qirq(sdev));
 276     }
 277
 278     return size;
 279 }
 280
 281 static NetClientInfo net_spapr_vlan_info = {
 282     .type = NET_CLIENT_DRIVER_NIC,
 283     .size = sizeof(NICState),
 284     .can_receive = spapr_vlan_can_receive,
 285     .receive = spapr_vlan_receive,
 286 };
 287
 288 static void spapr_vlan_flush_rx_queue(void *opaque)
 289 {
 290     VIOsPAPRVLANDevice *dev = opaque;
 291
 292     qemu_flush_queued_packets(qemu_get_queue(dev->nic));
 293 }
 294
 295 static void spapr_vlan_reset_rx_pool(RxBufPool *rxp)
 296 {
 297     /*
 298      * Use INT_MAX as bufsize so that unused buffers are moved to the end
 299      * of the list during the qsort in spapr_vlan_add_rxbuf_to_pool() later.
 300      */
 301     rxp->bufsize = INT_MAX;
 302     rxp->count = 0;
 303     memset(rxp->bds, 0, sizeof(rxp->bds));
 304 }
 305
 306 static void spapr_vlan_reset(VIOsPAPRDevice *sdev)
 307 {
 308     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 309     int i;
 310
 311     dev->buf_list = 0;
 312     dev->rx_bufs = 0;
 313     dev->isopen = 0;
 314
 315     if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
 316         for (i = 0; i < RX_MAX_POOLS; i++) {
 317             spapr_vlan_reset_rx_pool(dev->rx_pool[i]);
 318         }
 319     }
 320
 321     memcpy(&dev->nicconf.macaddr.a, &dev->perm_mac.a,
 322            sizeof(dev->nicconf.macaddr.a));
 323     qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a);
 324 }
 325
 326 static void spapr_vlan_realize(VIOsPAPRDevice *sdev, Error **errp)
 327 {
 328     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 329
 330     qemu_macaddr_default_if_unset(&dev->nicconf.macaddr);
 331
 332     memcpy(&dev->perm_mac.a, &dev->nicconf.macaddr.a, sizeof(dev->perm_mac.a));
 333
 334     dev->nic = qemu_new_nic(&net_spapr_vlan_info, &dev->nicconf,
 335                             object_get_typename(OBJECT(sdev)), sdev->qdev.id, dev);
 336     qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a);
 337
 338     dev->rxp_timer = timer_new_us(QEMU_CLOCK_VIRTUAL, spapr_vlan_flush_rx_queue,
 339                                   dev);
 340 }
 341
 342 static void spapr_vlan_instance_init(Object *obj)
 343 {
 344     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(obj);
 345     int i;
 346
 347     device_add_bootindex_property(obj, &dev->nicconf.bootindex,
 348                                   "bootindex", "",
 349                                   DEVICE(dev), NULL);
 350
 351     if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
 352         for (i = 0; i < RX_MAX_POOLS; i++) {
 353             dev->rx_pool[i] = g_new(RxBufPool, 1);
 354             spapr_vlan_reset_rx_pool(dev->rx_pool[i]);
 355         }
 356     }
 357 }
 358
 359 static void spapr_vlan_instance_finalize(Object *obj)
 360 {
 361     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(obj);
 362     int i;
 363
 364     if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
 365         for (i = 0; i < RX_MAX_POOLS; i++) {
 366             g_free(dev->rx_pool[i]);
 367             dev->rx_pool[i] = NULL;
 368         }
 369     }
 370
 371     if (dev->rxp_timer) {
 372         timer_del(dev->rxp_timer);
 373         timer_free(dev->rxp_timer);
 374     }
 375 }
 376
 377 void spapr_vlan_create(VIOsPAPRBus *bus, NICInfo *nd)
 378 {
 379     DeviceState *dev;
 380
 381     dev = qdev_create(&bus->bus, "spapr-vlan");
 382
 383     qdev_set_nic_properties(dev, nd);
 384
 385     qdev_init_nofail(dev);
 386 }
 387
 388 static int spapr_vlan_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)
 389 {
 390     VIOsPAPRVLANDevice *vdev = VIO_SPAPR_VLAN_DEVICE(dev);
 391     uint8_t padded_mac[8] = {0, 0};
 392     int ret;
 393
 394     /* Some old phyp versions give the mac address in an 8-byte
 395      * property.  The kernel driver has an insane workaround for this;
 396      * rather than doing the obvious thing and checking the property
 397      * length, it checks whether the first byte has 0b10 in the low
 398      * bits.  If a correct 6-byte property has a different first byte
 399      * the kernel will get the wrong mac address, overrunning its
 400      * buffer in the process (read only, thank goodness).
 401      *
 402      * Here we workaround the kernel workaround by always supplying an
 403      * 8-byte property, with the mac address in the last six bytes */
 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     if (ret < 0) {
 408         return ret;
 409     }
 410
 411     ret = fdt_setprop_cell(fdt, node_off, "ibm,mac-address-filters", 0);
 412     if (ret < 0) {
 413         return ret;
 414     }
 415
 416     return 0;
 417 }
 418
 419 static int check_bd(VIOsPAPRVLANDevice *dev, vlan_bd_t bd,
 420                     target_ulong alignment)
 421 {
 422     if ((VLAN_BD_ADDR(bd) % alignment)
 423         || (VLAN_BD_LEN(bd) % alignment)) {
 424         return -1;
 425     }
 426
 427     if (!spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd),
 428                              VLAN_BD_LEN(bd), DMA_DIRECTION_FROM_DEVICE)
 429         || !spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd),
 430                                 VLAN_BD_LEN(bd), DMA_DIRECTION_TO_DEVICE)) {
 431         return -1;
 432     }
 433
 434     return 0;
 435 }
 436
 437 static target_ulong h_register_logical_lan(PowerPCCPU *cpu,
 438                                            sPAPRMachineState *spapr,
 439                                            target_ulong opcode,
 440                                            target_ulong *args)
 441 {
 442     target_ulong reg = args[0];
 443     target_ulong buf_list = args[1];
 444     target_ulong rec_queue = args[2];
 445     target_ulong filter_list = args[3];
 446     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 447     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 448     vlan_bd_t filter_list_bd;
 449
 450     if (!dev) {
 451         return H_PARAMETER;
 452     }
 453
 454     if (dev->isopen) {
 455         hcall_dprintf("H_REGISTER_LOGICAL_LAN called twice without "
 456                       "H_FREE_LOGICAL_LAN\n");
 457         return H_RESOURCE;
 458     }
 459
 460     if (check_bd(dev, VLAN_VALID_BD(buf_list, SPAPR_TCE_PAGE_SIZE),
 461                  SPAPR_TCE_PAGE_SIZE) < 0) {
 462         hcall_dprintf("Bad buf_list 0x" TARGET_FMT_lx "\n", buf_list);
 463         return H_PARAMETER;
 464     }
 465
 466     filter_list_bd = VLAN_VALID_BD(filter_list, SPAPR_TCE_PAGE_SIZE);
 467     if (check_bd(dev, filter_list_bd, SPAPR_TCE_PAGE_SIZE) < 0) {
 468         hcall_dprintf("Bad filter_list 0x" TARGET_FMT_lx "\n", filter_list);
 469         return H_PARAMETER;
 470     }
 471
 472     if (!(rec_queue & VLAN_BD_VALID)
 473         || (check_bd(dev, rec_queue, VLAN_RQ_ALIGNMENT) < 0)) {
 474         hcall_dprintf("Bad receive queue\n");
 475         return H_PARAMETER;
 476     }
 477
 478     dev->buf_list = buf_list;
 479     sdev->signal_state = 0;
 480
 481     rec_queue &= ~VLAN_BD_TOGGLE;
 482
 483     /* Initialize the buffer list */
 484     vio_stq(sdev, buf_list, rec_queue);
 485     vio_stq(sdev, buf_list + 8, filter_list_bd);
 486     spapr_vio_dma_set(sdev, buf_list + VLAN_RX_BDS_OFF, 0,
 487                       SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF);
 488     dev->add_buf_ptr = VLAN_RX_BDS_OFF - 8;
 489     dev->use_buf_ptr = VLAN_RX_BDS_OFF - 8;
 490     dev->rx_bufs = 0;
 491     dev->rxq_ptr = 0;
 492
 493     /* Initialize the receive queue */
 494     spapr_vio_dma_set(sdev, VLAN_BD_ADDR(rec_queue), 0, VLAN_BD_LEN(rec_queue));
 495
 496     dev->isopen = 1;
 497     qemu_flush_queued_packets(qemu_get_queue(dev->nic));
 498
 499     return H_SUCCESS;
 500 }
 501
 502
 503 static target_ulong h_free_logical_lan(PowerPCCPU *cpu,
 504                                        sPAPRMachineState *spapr,
 505                                        target_ulong opcode, target_ulong *args)
 506 {
 507     target_ulong reg = args[0];
 508     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 509     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 510
 511     if (!dev) {
 512         return H_PARAMETER;
 513     }
 514
 515     if (!dev->isopen) {
 516         hcall_dprintf("H_FREE_LOGICAL_LAN called without "
 517                       "H_REGISTER_LOGICAL_LAN\n");
 518         return H_RESOURCE;
 519     }
 520
 521     spapr_vlan_reset(sdev);
 522     return H_SUCCESS;
 523 }
 524
 525 /**
 526  * Used for qsort, this function compares two RxBufPools by size.
 527  */
 528 static int rx_pool_size_compare(const void *p1, const void *p2)
 529 {
 530     const RxBufPool *pool1 = *(RxBufPool **)p1;
 531     const RxBufPool *pool2 = *(RxBufPool **)p2;
 532
 533     if (pool1->bufsize < pool2->bufsize) {
 534         return -1;
 535     }
 536     return pool1->bufsize > pool2->bufsize;
 537 }
 538
 539 /**
 540  * Search for a matching buffer pool with exact matching size,
 541  * or return -1 if no matching pool has been found.
 542  */
 543 static int spapr_vlan_get_rx_pool_id(VIOsPAPRVLANDevice *dev, int size)
 544 {
 545     int pool;
 546
 547     for (pool = 0; pool < RX_MAX_POOLS; pool++) {
 548         if (dev->rx_pool[pool]->bufsize == size) {
 549             return pool;
 550         }
 551     }
 552
 553     return -1;
 554 }
 555
 556 /**
 557  * Enqueuing receive buffer by adding it to one of our receive buffer pools
 558  */
 559 static target_long spapr_vlan_add_rxbuf_to_pool(VIOsPAPRVLANDevice *dev,
 560                                                 target_ulong buf)
 561 {
 562     int size = VLAN_BD_LEN(buf);
 563     int pool;
 564
 565     pool = spapr_vlan_get_rx_pool_id(dev, size);
 566     if (pool < 0) {
 567         /*
 568          * No matching pool found? Try to use a new one. If the guest used all
 569          * pools before, but changed the size of one pool inbetween, we might
 570          * need to recycle that pool here (if it's empty already). Thus scan
 571          * all buffer pools now, starting with the last (likely empty) one.
 572          */
 573         for (pool = RX_MAX_POOLS - 1; pool >= 0 ; pool--) {
 574             if (dev->rx_pool[pool]->count == 0) {
 575                 dev->rx_pool[pool]->bufsize = size;
 576                 /*
 577                  * Sort pools by size so that spapr_vlan_receive()
 578                  * can later find the smallest buffer pool easily.
 579                  */
 580                 qsort(dev->rx_pool, RX_MAX_POOLS, sizeof(dev->rx_pool[0]),
 581                       rx_pool_size_compare);
 582                 pool = spapr_vlan_get_rx_pool_id(dev, size);
 583                 DPRINTF("created RX pool %d for size %lld\n", pool,
 584                         VLAN_BD_LEN(buf));
 585                 break;
 586             }
 587         }
 588     }
 589     /* Still no usable pool? Give up */
 590     if (pool < 0 || dev->rx_pool[pool]->count >= RX_POOL_MAX_BDS) {
 591         return H_RESOURCE;
 592     }
 593
 594     DPRINTF("h_add_llan_buf():  Add buf using pool %i (size %lli, count=%i)\n",
 595             pool, VLAN_BD_LEN(buf), dev->rx_pool[pool]->count);
 596
 597     dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count++] = buf;
 598
 599     return 0;
 600 }
 601
 602 /**
 603  * This is the old way of enqueuing receive buffers: Add it to the rx queue
 604  * page that has been supplied by the guest (which is quite limited in size).
 605  */
 606 static target_long spapr_vlan_add_rxbuf_to_page(VIOsPAPRVLANDevice *dev,
 607                                                 target_ulong buf)
 608 {
 609     vlan_bd_t bd;
 610
 611     if (dev->rx_bufs >= VLAN_MAX_BUFS) {
 612         return H_RESOURCE;
 613     }
 614
 615     do {
 616         dev->add_buf_ptr += 8;
 617         if (dev->add_buf_ptr >= VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF) {
 618             dev->add_buf_ptr = VLAN_RX_BDS_OFF;
 619         }
 620
 621         bd = vio_ldq(&dev->sdev, dev->buf_list + dev->add_buf_ptr);
 622     } while (bd & VLAN_BD_VALID);
 623
 624     vio_stq(&dev->sdev, dev->buf_list + dev->add_buf_ptr, buf);
 625
 626     DPRINTF("h_add_llan_buf():  Added buf  ptr=%d  rx_bufs=%d bd=0x%016llx\n",
 627             dev->add_buf_ptr, dev->rx_bufs, (unsigned long long)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     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 640     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 641     target_long ret;
 642
 643     DPRINTF("H_ADD_LOGICAL_LAN_BUFFER(0x" TARGET_FMT_lx
 644             ", 0x" TARGET_FMT_lx ")\n", 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     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 691     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 692     unsigned total_len;
 693     uint8_t *lbuf, *p;
 694     int i, nbufs;
 695     int ret;
 696
 697     DPRINTF("H_SEND_LOGICAL_LAN(0x" TARGET_FMT_lx ", <bufs>, 0x"
 698             TARGET_FMT_lx ")\n", reg, continue_token);
 699
 700     if (!sdev) {
 701         return H_PARAMETER;
 702     }
 703
 704     DPRINTF("rxbufs = %d\n", dev->rx_bufs);
 705
 706     if (!dev->isopen) {
 707         return H_DROPPED;
 708     }
 709
 710     if (continue_token) {
 711         return H_HARDWARE; /* FIXME actually handle this */
 712     }
 713
 714     total_len = 0;
 715     for (i = 0; i < 6; i++) {
 716         DPRINTF("   buf desc: 0x" TARGET_FMT_lx "\n", bufs[i]);
 717         if (!(bufs[i] & VLAN_BD_VALID)) {
 718             break;
 719         }
 720         total_len += VLAN_BD_LEN(bufs[i]);
 721     }
 722
 723     nbufs = i;
 724     DPRINTF("h_send_logical_lan() %d buffers, total length 0x%x\n",
 725             nbufs, total_len);
 726
 727     if (total_len == 0) {
 728         return H_SUCCESS;
 729     }
 730
 731     if (total_len > MAX_PACKET_SIZE) {
 732         /* Don't let the guest force too large an allocation */
 733         return H_RESOURCE;
 734     }
 735
 736     lbuf = alloca(total_len);
 737     p = lbuf;
 738     for (i = 0; i < nbufs; i++) {
 739         ret = spapr_vio_dma_read(sdev, VLAN_BD_ADDR(bufs[i]),
 740                                  p, VLAN_BD_LEN(bufs[i]));
 741         if (ret < 0) {
 742             return ret;
 743         }
 744
 745         p += VLAN_BD_LEN(bufs[i]);
 746     }
 747
 748     qemu_send_packet(qemu_get_queue(dev->nic), lbuf, total_len);
 749
 750     return H_SUCCESS;
 751 }
 752
 753 static target_ulong h_multicast_ctrl(PowerPCCPU *cpu, sPAPRMachineState *spapr,
 754                                      target_ulong opcode, target_ulong *args)
 755 {
 756     target_ulong reg = args[0];
 757     VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 758
 759     if (!dev) {
 760         return H_PARAMETER;
 761     }
 762
 763     return H_SUCCESS;
 764 }
 765
 766 static target_ulong h_change_logical_lan_mac(PowerPCCPU *cpu,
 767                                              sPAPRMachineState *spapr,
 768                                              target_ulong opcode,
 769                                              target_ulong *args)
 770 {
 771     target_ulong reg = args[0];
 772     target_ulong macaddr = args[1];
 773     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 774     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 775     int i;
 776
 777     for (i = 0; i < ETH_ALEN; i++) {
 778         dev->nicconf.macaddr.a[ETH_ALEN - i - 1] = macaddr & 0xff;
 779         macaddr >>= 8;
 780     }
 781
 782     qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a);
 783
 784     return H_SUCCESS;
 785 }
 786
 787 static Property spapr_vlan_properties[] = {
 788     DEFINE_SPAPR_PROPERTIES(VIOsPAPRVLANDevice, sdev),
 789     DEFINE_NIC_PROPERTIES(VIOsPAPRVLANDevice, nicconf),
 790     DEFINE_PROP_BIT("use-rx-buffer-pools", VIOsPAPRVLANDevice,
 791                     compat_flags, SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT, true),
 792     DEFINE_PROP_END_OF_LIST(),
 793 };
 794
 795 static bool spapr_vlan_rx_buffer_pools_needed(void *opaque)
 796 {
 797     VIOsPAPRVLANDevice *dev = opaque;
 798
 799     return (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) != 0;
 800 }
 801
 802 static const VMStateDescription vmstate_rx_buffer_pool = {
 803     .name = "spapr_llan/rx_buffer_pool",
 804     .version_id = 1,
 805     .minimum_version_id = 1,
 806     .needed = spapr_vlan_rx_buffer_pools_needed,
 807     .fields = (VMStateField[]) {
 808         VMSTATE_INT32(bufsize, RxBufPool),
 809         VMSTATE_INT32(count, RxBufPool),
 810         VMSTATE_UINT64_ARRAY(bds, RxBufPool, RX_POOL_MAX_BDS),
 811         VMSTATE_END_OF_LIST()
 812     }
 813 };
 814
 815 static const VMStateDescription vmstate_rx_pools = {
 816     .name = "spapr_llan/rx_pools",
 817     .version_id = 1,
 818     .minimum_version_id = 1,
 819     .needed = spapr_vlan_rx_buffer_pools_needed,
 820     .fields = (VMStateField[]) {
 821         VMSTATE_ARRAY_OF_POINTER_TO_STRUCT(rx_pool, VIOsPAPRVLANDevice,
 822                                            RX_MAX_POOLS, 1,
 823                                            vmstate_rx_buffer_pool, RxBufPool),
 824         VMSTATE_END_OF_LIST()
 825     }
 826 };
 827
 828 static const VMStateDescription vmstate_spapr_llan = {
 829     .name = "spapr_llan",
 830     .version_id = 1,
 831     .minimum_version_id = 1,
 832     .fields = (VMStateField[]) {
 833         VMSTATE_SPAPR_VIO(sdev, VIOsPAPRVLANDevice),
 834         /* LLAN state */
 835         VMSTATE_BOOL(isopen, VIOsPAPRVLANDevice),
 836         VMSTATE_UINT64(buf_list, VIOsPAPRVLANDevice),
 837         VMSTATE_UINT32(add_buf_ptr, VIOsPAPRVLANDevice),
 838         VMSTATE_UINT32(use_buf_ptr, VIOsPAPRVLANDevice),
 839         VMSTATE_UINT32(rx_bufs, VIOsPAPRVLANDevice),
 840         VMSTATE_UINT64(rxq_ptr, VIOsPAPRVLANDevice),
 841
 842         VMSTATE_END_OF_LIST()
 843     },
 844     .subsections = (const VMStateDescription * []) {
 845         &vmstate_rx_pools,
 846         NULL
 847     }
 848 };
 849
 850 static void spapr_vlan_class_init(ObjectClass *klass, void *data)
 851 {
 852     DeviceClass *dc = DEVICE_CLASS(klass);
 853     VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
 854
 855     k->realize = spapr_vlan_realize;
 856     k->reset = spapr_vlan_reset;
 857     k->devnode = spapr_vlan_devnode;
 858     k->dt_name = "l-lan";
 859     k->dt_type = "network";
 860     k->dt_compatible = "IBM,l-lan";
 861     k->signal_mask = 0x1;
 862     set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
 863     dc->props = spapr_vlan_properties;
 864     k->rtce_window_size = 0x10000000;
 865     dc->vmsd = &vmstate_spapr_llan;
 866 }
 867
 868 static const TypeInfo spapr_vlan_info = {
 869     .name          = TYPE_VIO_SPAPR_VLAN_DEVICE,
 870     .parent        = TYPE_VIO_SPAPR_DEVICE,
 871     .instance_size = sizeof(VIOsPAPRVLANDevice),
 872     .class_init    = spapr_vlan_class_init,
 873     .instance_init = spapr_vlan_instance_init,
 874     .instance_finalize = spapr_vlan_instance_finalize,
 875 };
 876
 877 static void spapr_vlan_register_types(void)
 878 {
 879     spapr_register_hypercall(H_REGISTER_LOGICAL_LAN, h_register_logical_lan);
 880     spapr_register_hypercall(H_FREE_LOGICAL_LAN, h_free_logical_lan);
 881     spapr_register_hypercall(H_SEND_LOGICAL_LAN, h_send_logical_lan);
 882     spapr_register_hypercall(H_ADD_LOGICAL_LAN_BUFFER,
 883                              h_add_logical_lan_buffer);
 884     spapr_register_hypercall(H_MULTICAST_CTRL, h_multicast_ctrl);
 885     spapr_register_hypercall(H_CHANGE_LOGICAL_LAN_MAC,
 886                              h_change_logical_lan_mac);
 887     type_register_static(&spapr_vlan_info);
 888 }
 889
 890 type_init(spapr_vlan_register_types)