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 "hw/hw.h"
  28 #include "net/net.h"
  29 #include "hw/qdev.h"
  30 #include "hw/ppc/spapr.h"
  31 #include "hw/ppc/spapr_vio.h"
  32
  33 #include <libfdt.h>
  34
  35 #define ETH_ALEN        6
  36 #define MAX_PACKET_SIZE 65536
  37
  38 /*#define DEBUG*/
  39
  40 #ifdef DEBUG
  41 #define dprintf(fmt...) do { fprintf(stderr, fmt); } while (0)
  42 #else
  43 #define dprintf(fmt...)
  44 #endif
  45
  46 /*
  47  * Virtual LAN device
  48  */
  49
  50 typedef uint64_t vlan_bd_t;
  51
  52 #define VLAN_BD_VALID        0x8000000000000000ULL
  53 #define VLAN_BD_TOGGLE       0x4000000000000000ULL
  54 #define VLAN_BD_NO_CSUM      0x0200000000000000ULL
  55 #define VLAN_BD_CSUM_GOOD    0x0100000000000000ULL
  56 #define VLAN_BD_LEN_MASK     0x00ffffff00000000ULL
  57 #define VLAN_BD_LEN(bd)      (((bd) & VLAN_BD_LEN_MASK) >> 32)
  58 #define VLAN_BD_ADDR_MASK    0x00000000ffffffffULL
  59 #define VLAN_BD_ADDR(bd)     ((bd) & VLAN_BD_ADDR_MASK)
  60
  61 #define VLAN_VALID_BD(addr, len) (VLAN_BD_VALID | \
  62                                   (((len) << 32) & VLAN_BD_LEN_MASK) |  \
  63                                   (addr & VLAN_BD_ADDR_MASK))
  64
  65 #define VLAN_RXQC_TOGGLE     0x80
  66 #define VLAN_RXQC_VALID      0x40
  67 #define VLAN_RXQC_NO_CSUM    0x02
  68 #define VLAN_RXQC_CSUM_GOOD  0x01
  69
  70 #define VLAN_RQ_ALIGNMENT    16
  71 #define VLAN_RXQ_BD_OFF      0
  72 #define VLAN_FILTER_BD_OFF   8
  73 #define VLAN_RX_BDS_OFF      16
  74 #define VLAN_MAX_BUFS        ((SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF) / 8)
  75
  76 #define TYPE_VIO_SPAPR_VLAN_DEVICE "spapr-vlan"
  77 #define VIO_SPAPR_VLAN_DEVICE(obj) \
  78      OBJECT_CHECK(VIOsPAPRVLANDevice, (obj), TYPE_VIO_SPAPR_VLAN_DEVICE)
  79
  80 typedef struct VIOsPAPRVLANDevice {
  81     VIOsPAPRDevice sdev;
  82     NICConf nicconf;
  83     NICState *nic;
  84     int isopen;
  85     target_ulong buf_list;
  86     int add_buf_ptr, use_buf_ptr, rx_bufs;
  87     target_ulong rxq_ptr;
  88 } VIOsPAPRVLANDevice;
  89
  90 static int spapr_vlan_can_receive(NetClientState *nc)
  91 {
  92     VIOsPAPRVLANDevice *dev = qemu_get_nic_opaque(nc);
  93
  94     return (dev->isopen && dev->rx_bufs > 0);
  95 }
  96
  97 static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf,
  98                                   size_t size)
  99 {
 100     VIOsPAPRVLANDevice *dev = qemu_get_nic_opaque(nc);
 101     VIOsPAPRDevice *sdev = VIO_SPAPR_DEVICE(dev);
 102     vlan_bd_t rxq_bd = vio_ldq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF);
 103     vlan_bd_t bd;
 104     int buf_ptr = dev->use_buf_ptr;
 105     uint64_t handle;
 106     uint8_t control;
 107
 108     dprintf("spapr_vlan_receive() [%s] rx_bufs=%d\n", sdev->qdev.id,
 109             dev->rx_bufs);
 110
 111     if (!dev->isopen) {
 112         return -1;
 113     }
 114
 115     if (!dev->rx_bufs) {
 116         return -1;
 117     }
 118
 119     do {
 120         buf_ptr += 8;
 121         if (buf_ptr >= SPAPR_TCE_PAGE_SIZE) {
 122             buf_ptr = VLAN_RX_BDS_OFF;
 123         }
 124
 125         bd = vio_ldq(sdev, dev->buf_list + buf_ptr);
 126         dprintf("use_buf_ptr=%d bd=0x%016llx\n",
 127                 buf_ptr, (unsigned long long)bd);
 128     } while ((!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8)))
 129              && (buf_ptr != dev->use_buf_ptr));
 130
 131     if (!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8))) {
 132         /* Failed to find a suitable buffer */
 133         return -1;
 134     }
 135
 136     /* Remove the buffer from the pool */
 137     dev->rx_bufs--;
 138     dev->use_buf_ptr = buf_ptr;
 139     vio_stq(sdev, dev->buf_list + dev->use_buf_ptr, 0);
 140
 141     dprintf("Found buffer: ptr=%d num=%d\n", dev->use_buf_ptr, dev->rx_bufs);
 142
 143     /* Transfer the packet data */
 144     if (spapr_vio_dma_write(sdev, VLAN_BD_ADDR(bd) + 8, buf, size) < 0) {
 145         return -1;
 146     }
 147
 148     dprintf("spapr_vlan_receive: DMA write completed\n");
 149
 150     /* Update the receive queue */
 151     control = VLAN_RXQC_TOGGLE | VLAN_RXQC_VALID;
 152     if (rxq_bd & VLAN_BD_TOGGLE) {
 153         control ^= VLAN_RXQC_TOGGLE;
 154     }
 155
 156     handle = vio_ldq(sdev, VLAN_BD_ADDR(bd));
 157     vio_stq(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 8, handle);
 158     vio_stl(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 4, size);
 159     vio_sth(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 2, 8);
 160     vio_stb(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr, control);
 161
 162     dprintf("wrote rxq entry (ptr=0x%llx): 0x%016llx 0x%016llx\n",
 163             (unsigned long long)dev->rxq_ptr,
 164             (unsigned long long)vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) +
 165                                         dev->rxq_ptr),
 166             (unsigned long long)vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) +
 167                                         dev->rxq_ptr + 8));
 168
 169     dev->rxq_ptr += 16;
 170     if (dev->rxq_ptr >= VLAN_BD_LEN(rxq_bd)) {
 171         dev->rxq_ptr = 0;
 172         vio_stq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF, rxq_bd ^ VLAN_BD_TOGGLE);
 173     }
 174
 175     if (sdev->signal_state & 1) {
 176         qemu_irq_pulse(spapr_vio_qirq(sdev));
 177     }
 178
 179     return size;
 180 }
 181
 182 static void spapr_vlan_cleanup(NetClientState *nc)
 183 {
 184     VIOsPAPRVLANDevice *dev = qemu_get_nic_opaque(nc);
 185
 186     dev->nic = NULL;
 187 }
 188
 189 static NetClientInfo net_spapr_vlan_info = {
 190     .type = NET_CLIENT_OPTIONS_KIND_NIC,
 191     .size = sizeof(NICState),
 192     .can_receive = spapr_vlan_can_receive,
 193     .receive = spapr_vlan_receive,
 194     .cleanup = spapr_vlan_cleanup,
 195 };
 196
 197 static void spapr_vlan_reset(VIOsPAPRDevice *sdev)
 198 {
 199     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 200
 201     dev->buf_list = 0;
 202     dev->rx_bufs = 0;
 203     dev->isopen = 0;
 204 }
 205
 206 static int spapr_vlan_init(VIOsPAPRDevice *sdev)
 207 {
 208     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 209
 210     qemu_macaddr_default_if_unset(&dev->nicconf.macaddr);
 211
 212     dev->nic = qemu_new_nic(&net_spapr_vlan_info, &dev->nicconf,
 213                             object_get_typename(OBJECT(sdev)), sdev->qdev.id, dev);
 214     qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a);
 215
 216     return 0;
 217 }
 218
 219 void spapr_vlan_create(VIOsPAPRBus *bus, NICInfo *nd)
 220 {
 221     DeviceState *dev;
 222
 223     dev = qdev_create(&bus->bus, "spapr-vlan");
 224
 225     qdev_set_nic_properties(dev, nd);
 226
 227     qdev_init_nofail(dev);
 228 }
 229
 230 static int spapr_vlan_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)
 231 {
 232     VIOsPAPRVLANDevice *vdev = VIO_SPAPR_VLAN_DEVICE(dev);
 233     uint8_t padded_mac[8] = {0, 0};
 234     int ret;
 235
 236     /* Some old phyp versions give the mac address in an 8-byte
 237      * property.  The kernel driver has an insane workaround for this;
 238      * rather than doing the obvious thing and checking the property
 239      * length, it checks whether the first byte has 0b10 in the low
 240      * bits.  If a correct 6-byte property has a different first byte
 241      * the kernel will get the wrong mac address, overrunning its
 242      * buffer in the process (read only, thank goodness).
 243      *
 244      * Here we workaround the kernel workaround by always supplying an
 245      * 8-byte property, with the mac address in the last six bytes */
 246     memcpy(&padded_mac[2], &vdev->nicconf.macaddr, ETH_ALEN);
 247     ret = fdt_setprop(fdt, node_off, "local-mac-address",
 248                       padded_mac, sizeof(padded_mac));
 249     if (ret < 0) {
 250         return ret;
 251     }
 252
 253     ret = fdt_setprop_cell(fdt, node_off, "ibm,mac-address-filters", 0);
 254     if (ret < 0) {
 255         return ret;
 256     }
 257
 258     return 0;
 259 }
 260
 261 static int check_bd(VIOsPAPRVLANDevice *dev, vlan_bd_t bd,
 262                     target_ulong alignment)
 263 {
 264     if ((VLAN_BD_ADDR(bd) % alignment)
 265         || (VLAN_BD_LEN(bd) % alignment)) {
 266         return -1;
 267     }
 268
 269     if (!spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd),
 270                              VLAN_BD_LEN(bd), DMA_DIRECTION_FROM_DEVICE)
 271         || !spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd),
 272                                 VLAN_BD_LEN(bd), DMA_DIRECTION_TO_DEVICE)) {
 273         return -1;
 274     }
 275
 276     return 0;
 277 }
 278
 279 static target_ulong h_register_logical_lan(PowerPCCPU *cpu,
 280                                            sPAPREnvironment *spapr,
 281                                            target_ulong opcode,
 282                                            target_ulong *args)
 283 {
 284     target_ulong reg = args[0];
 285     target_ulong buf_list = args[1];
 286     target_ulong rec_queue = args[2];
 287     target_ulong filter_list = args[3];
 288     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 289     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 290     vlan_bd_t filter_list_bd;
 291
 292     if (!dev) {
 293         return H_PARAMETER;
 294     }
 295
 296     if (dev->isopen) {
 297         hcall_dprintf("H_REGISTER_LOGICAL_LAN called twice without "
 298                       "H_FREE_LOGICAL_LAN\n");
 299         return H_RESOURCE;
 300     }
 301
 302     if (check_bd(dev, VLAN_VALID_BD(buf_list, SPAPR_TCE_PAGE_SIZE),
 303                  SPAPR_TCE_PAGE_SIZE) < 0) {
 304         hcall_dprintf("Bad buf_list 0x" TARGET_FMT_lx "\n", buf_list);
 305         return H_PARAMETER;
 306     }
 307
 308     filter_list_bd = VLAN_VALID_BD(filter_list, SPAPR_TCE_PAGE_SIZE);
 309     if (check_bd(dev, filter_list_bd, SPAPR_TCE_PAGE_SIZE) < 0) {
 310         hcall_dprintf("Bad filter_list 0x" TARGET_FMT_lx "\n", filter_list);
 311         return H_PARAMETER;
 312     }
 313
 314     if (!(rec_queue & VLAN_BD_VALID)
 315         || (check_bd(dev, rec_queue, VLAN_RQ_ALIGNMENT) < 0)) {
 316         hcall_dprintf("Bad receive queue\n");
 317         return H_PARAMETER;
 318     }
 319
 320     dev->buf_list = buf_list;
 321     sdev->signal_state = 0;
 322
 323     rec_queue &= ~VLAN_BD_TOGGLE;
 324
 325     /* Initialize the buffer list */
 326     vio_stq(sdev, buf_list, rec_queue);
 327     vio_stq(sdev, buf_list + 8, filter_list_bd);
 328     spapr_vio_dma_set(sdev, buf_list + VLAN_RX_BDS_OFF, 0,
 329                       SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF);
 330     dev->add_buf_ptr = VLAN_RX_BDS_OFF - 8;
 331     dev->use_buf_ptr = VLAN_RX_BDS_OFF - 8;
 332     dev->rx_bufs = 0;
 333     dev->rxq_ptr = 0;
 334
 335     /* Initialize the receive queue */
 336     spapr_vio_dma_set(sdev, VLAN_BD_ADDR(rec_queue), 0, VLAN_BD_LEN(rec_queue));
 337
 338     dev->isopen = 1;
 339     qemu_flush_queued_packets(qemu_get_queue(dev->nic));
 340
 341     return H_SUCCESS;
 342 }
 343
 344
 345 static target_ulong h_free_logical_lan(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 346                                        target_ulong opcode, target_ulong *args)
 347 {
 348     target_ulong reg = args[0];
 349     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 350     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 351
 352     if (!dev) {
 353         return H_PARAMETER;
 354     }
 355
 356     if (!dev->isopen) {
 357         hcall_dprintf("H_FREE_LOGICAL_LAN called without "
 358                       "H_REGISTER_LOGICAL_LAN\n");
 359         return H_RESOURCE;
 360     }
 361
 362     spapr_vlan_reset(sdev);
 363     return H_SUCCESS;
 364 }
 365
 366 static target_ulong h_add_logical_lan_buffer(PowerPCCPU *cpu,
 367                                              sPAPREnvironment *spapr,
 368                                              target_ulong opcode,
 369                                              target_ulong *args)
 370 {
 371     target_ulong reg = args[0];
 372     target_ulong buf = args[1];
 373     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 374     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 375     vlan_bd_t bd;
 376
 377     dprintf("H_ADD_LOGICAL_LAN_BUFFER(0x" TARGET_FMT_lx
 378             ", 0x" TARGET_FMT_lx ")\n", reg, buf);
 379
 380     if (!sdev) {
 381         hcall_dprintf("Bad device\n");
 382         return H_PARAMETER;
 383     }
 384
 385     if ((check_bd(dev, buf, 4) < 0)
 386         || (VLAN_BD_LEN(buf) < 16)) {
 387         hcall_dprintf("Bad buffer enqueued\n");
 388         return H_PARAMETER;
 389     }
 390
 391     if (!dev->isopen || dev->rx_bufs >= VLAN_MAX_BUFS) {
 392         return H_RESOURCE;
 393     }
 394
 395     do {
 396         dev->add_buf_ptr += 8;
 397         if (dev->add_buf_ptr >= SPAPR_TCE_PAGE_SIZE) {
 398             dev->add_buf_ptr = VLAN_RX_BDS_OFF;
 399         }
 400
 401         bd = vio_ldq(sdev, dev->buf_list + dev->add_buf_ptr);
 402     } while (bd & VLAN_BD_VALID);
 403
 404     vio_stq(sdev, dev->buf_list + dev->add_buf_ptr, buf);
 405
 406     dev->rx_bufs++;
 407
 408     dprintf("h_add_logical_lan_buffer():  Added buf  ptr=%d  rx_bufs=%d"
 409             " bd=0x%016llx\n", dev->add_buf_ptr, dev->rx_bufs,
 410             (unsigned long long)buf);
 411
 412     return H_SUCCESS;
 413 }
 414
 415 static target_ulong h_send_logical_lan(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 416                                        target_ulong opcode, target_ulong *args)
 417 {
 418     target_ulong reg = args[0];
 419     target_ulong *bufs = args + 1;
 420     target_ulong continue_token = args[7];
 421     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 422     VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
 423     unsigned total_len;
 424     uint8_t *lbuf, *p;
 425     int i, nbufs;
 426     int ret;
 427
 428     dprintf("H_SEND_LOGICAL_LAN(0x" TARGET_FMT_lx ", <bufs>, 0x"
 429             TARGET_FMT_lx ")\n", reg, continue_token);
 430
 431     if (!sdev) {
 432         return H_PARAMETER;
 433     }
 434
 435     dprintf("rxbufs = %d\n", dev->rx_bufs);
 436
 437     if (!dev->isopen) {
 438         return H_DROPPED;
 439     }
 440
 441     if (continue_token) {
 442         return H_HARDWARE; /* FIXME actually handle this */
 443     }
 444
 445     total_len = 0;
 446     for (i = 0; i < 6; i++) {
 447         dprintf("   buf desc: 0x" TARGET_FMT_lx "\n", bufs[i]);
 448         if (!(bufs[i] & VLAN_BD_VALID)) {
 449             break;
 450         }
 451         total_len += VLAN_BD_LEN(bufs[i]);
 452     }
 453
 454     nbufs = i;
 455     dprintf("h_send_logical_lan() %d buffers, total length 0x%x\n",
 456             nbufs, total_len);
 457
 458     if (total_len == 0) {
 459         return H_SUCCESS;
 460     }
 461
 462     if (total_len > MAX_PACKET_SIZE) {
 463         /* Don't let the guest force too large an allocation */
 464         return H_RESOURCE;
 465     }
 466
 467     lbuf = alloca(total_len);
 468     p = lbuf;
 469     for (i = 0; i < nbufs; i++) {
 470         ret = spapr_vio_dma_read(sdev, VLAN_BD_ADDR(bufs[i]),
 471                                  p, VLAN_BD_LEN(bufs[i]));
 472         if (ret < 0) {
 473             return ret;
 474         }
 475
 476         p += VLAN_BD_LEN(bufs[i]);
 477     }
 478
 479     qemu_send_packet(qemu_get_queue(dev->nic), lbuf, total_len);
 480
 481     return H_SUCCESS;
 482 }
 483
 484 static target_ulong h_multicast_ctrl(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 485                                      target_ulong opcode, target_ulong *args)
 486 {
 487     target_ulong reg = args[0];
 488     VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 489
 490     if (!dev) {
 491         return H_PARAMETER;
 492     }
 493
 494     return H_SUCCESS;
 495 }
 496
 497 static Property spapr_vlan_properties[] = {
 498     DEFINE_SPAPR_PROPERTIES(VIOsPAPRVLANDevice, sdev),
 499     DEFINE_NIC_PROPERTIES(VIOsPAPRVLANDevice, nicconf),
 500     DEFINE_PROP_END_OF_LIST(),
 501 };
 502
 503 static void spapr_vlan_class_init(ObjectClass *klass, void *data)
 504 {
 505     DeviceClass *dc = DEVICE_CLASS(klass);
 506     VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
 507
 508     k->init = spapr_vlan_init;
 509     k->reset = spapr_vlan_reset;
 510     k->devnode = spapr_vlan_devnode;
 511     k->dt_name = "l-lan";
 512     k->dt_type = "network";
 513     k->dt_compatible = "IBM,l-lan";
 514     k->signal_mask = 0x1;
 515     dc->props = spapr_vlan_properties;
 516     k->rtce_window_size = 0x10000000;
 517 }
 518
 519 static const TypeInfo spapr_vlan_info = {
 520     .name          = TYPE_VIO_SPAPR_VLAN_DEVICE,
 521     .parent        = TYPE_VIO_SPAPR_DEVICE,
 522     .instance_size = sizeof(VIOsPAPRVLANDevice),
 523     .class_init    = spapr_vlan_class_init,
 524 };
 525
 526 static void spapr_vlan_register_types(void)
 527 {
 528     spapr_register_hypercall(H_REGISTER_LOGICAL_LAN, h_register_logical_lan);
 529     spapr_register_hypercall(H_FREE_LOGICAL_LAN, h_free_logical_lan);
 530     spapr_register_hypercall(H_SEND_LOGICAL_LAN, h_send_logical_lan);
 531     spapr_register_hypercall(H_ADD_LOGICAL_LAN_BUFFER,
 532                              h_add_logical_lan_buffer);
 533     spapr_register_hypercall(H_MULTICAST_CTRL, h_multicast_ctrl);
 534     type_register_static(&spapr_vlan_info);
 535 }
 536
 537 type_init(spapr_vlan_register_types)