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