hw/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.h"
  28 #include "net.h"
  29 #include "hw/qdev.h"
  30 #include "hw/spapr.h"
  31 #include "hw/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_VIO_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF) / 8)
  75
  76 typedef struct VIOsPAPRVLANDevice {
  77     VIOsPAPRDevice sdev;
  78     NICConf nicconf;
  79     NICState *nic;
  80     int isopen;
  81     target_ulong buf_list;
  82     int add_buf_ptr, use_buf_ptr, rx_bufs;
  83     target_ulong rxq_ptr;
  84 } VIOsPAPRVLANDevice;
  85
  86 static int spapr_vlan_can_receive(VLANClientState *nc)
  87 {
  88     VIOsPAPRVLANDevice *dev = DO_UPCAST(NICState, nc, nc)->opaque;
  89
  90     return (dev->isopen && dev->rx_bufs > 0);
  91 }
  92
  93 static ssize_t spapr_vlan_receive(VLANClientState *nc, const uint8_t *buf,
  94                                   size_t size)
  95 {
  96     VIOsPAPRDevice *sdev = DO_UPCAST(NICState, nc, nc)->opaque;
  97     VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
  98     vlan_bd_t rxq_bd = ldq_tce(sdev, dev->buf_list + VLAN_RXQ_BD_OFF);
  99     vlan_bd_t bd;
 100     int buf_ptr = dev->use_buf_ptr;
 101     uint64_t handle;
 102     uint8_t control;
 103
 104     dprintf("spapr_vlan_receive() [%s] rx_bufs=%d\n", sdev->qdev.id,
 105             dev->rx_bufs);
 106
 107     if (!dev->isopen) {
 108         return -1;
 109     }
 110
 111     if (!dev->rx_bufs) {
 112         return -1;
 113     }
 114
 115     do {
 116         buf_ptr += 8;
 117         if (buf_ptr >= SPAPR_VIO_TCE_PAGE_SIZE) {
 118             buf_ptr = VLAN_RX_BDS_OFF;
 119         }
 120
 121         bd = ldq_tce(sdev, dev->buf_list + buf_ptr);
 122         dprintf("use_buf_ptr=%d bd=0x%016llx\n",
 123                 buf_ptr, (unsigned long long)bd);
 124     } while ((!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8)))
 125              && (buf_ptr != dev->use_buf_ptr));
 126
 127     if (!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8))) {
 128         /* Failed to find a suitable buffer */
 129         return -1;
 130     }
 131
 132     /* Remove the buffer from the pool */
 133     dev->rx_bufs--;
 134     dev->use_buf_ptr = buf_ptr;
 135     stq_tce(sdev, dev->buf_list + dev->use_buf_ptr, 0);
 136
 137     dprintf("Found buffer: ptr=%d num=%d\n", dev->use_buf_ptr, dev->rx_bufs);
 138
 139     /* Transfer the packet data */
 140     if (spapr_tce_dma_write(sdev, VLAN_BD_ADDR(bd) + 8, buf, size) < 0) {
 141         return -1;
 142     }
 143
 144     dprintf("spapr_vlan_receive: DMA write completed\n");
 145
 146     /* Update the receive queue */
 147     control = VLAN_RXQC_TOGGLE | VLAN_RXQC_VALID;
 148     if (rxq_bd & VLAN_BD_TOGGLE) {
 149         control ^= VLAN_RXQC_TOGGLE;
 150     }
 151
 152     handle = ldq_tce(sdev, VLAN_BD_ADDR(bd));
 153     stq_tce(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 8, handle);
 154     stw_tce(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 4, size);
 155     sth_tce(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 2, 8);
 156     stb_tce(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr, control);
 157
 158     dprintf("wrote rxq entry (ptr=0x%llx): 0x%016llx 0x%016llx\n",
 159             (unsigned long long)dev->rxq_ptr,
 160             (unsigned long long)ldq_tce(sdev, VLAN_BD_ADDR(rxq_bd) +
 161                                         dev->rxq_ptr),
 162             (unsigned long long)ldq_tce(sdev, VLAN_BD_ADDR(rxq_bd) +
 163                                         dev->rxq_ptr + 8));
 164
 165     dev->rxq_ptr += 16;
 166     if (dev->rxq_ptr >= VLAN_BD_LEN(rxq_bd)) {
 167         dev->rxq_ptr = 0;
 168         stq_tce(sdev, dev->buf_list + VLAN_RXQ_BD_OFF, rxq_bd ^ VLAN_BD_TOGGLE);
 169     }
 170
 171     if (sdev->signal_state & 1) {
 172         qemu_irq_pulse(sdev->qirq);
 173     }
 174
 175     return size;
 176 }
 177
 178 static NetClientInfo net_spapr_vlan_info = {
 179     .type = NET_CLIENT_TYPE_NIC,
 180     .size = sizeof(NICState),
 181     .can_receive = spapr_vlan_can_receive,
 182     .receive = spapr_vlan_receive,
 183 };
 184
 185 static int spapr_vlan_init(VIOsPAPRDevice *sdev)
 186 {
 187     VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
 188
 189     qemu_macaddr_default_if_unset(&dev->nicconf.macaddr);
 190
 191     dev->nic = qemu_new_nic(&net_spapr_vlan_info, &dev->nicconf,
 192                             sdev->qdev.info->name, sdev->qdev.id, dev);
 193     qemu_format_nic_info_str(&dev->nic->nc, dev->nicconf.macaddr.a);
 194
 195     return 0;
 196 }
 197
 198 void spapr_vlan_create(VIOsPAPRBus *bus, uint32_t reg, NICInfo *nd)
 199 {
 200     DeviceState *dev;
 201
 202     dev = qdev_create(&bus->bus, "spapr-vlan");
 203     qdev_prop_set_uint32(dev, "reg", reg);
 204
 205     qdev_set_nic_properties(dev, nd);
 206
 207     qdev_init_nofail(dev);
 208 }
 209
 210 static int spapr_vlan_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)
 211 {
 212     VIOsPAPRVLANDevice *vdev = (VIOsPAPRVLANDevice *)dev;
 213     uint8_t padded_mac[8] = {0, 0};
 214     int ret;
 215
 216     /* Some old phyp versions give the mac address in an 8-byte
 217      * property.  The kernel driver has an insane workaround for this;
 218      * rather than doing the obvious thing and checking the property
 219      * length, it checks whether the first byte has 0b10 in the low
 220      * bits.  If a correct 6-byte property has a different first byte
 221      * the kernel will get the wrong mac address, overrunning its
 222      * buffer in the process (read only, thank goodness).
 223      *
 224      * Here we workaround the kernel workaround by always supplying an
 225      * 8-byte property, with the mac address in the last six bytes */
 226     memcpy(&padded_mac[2], &vdev->nicconf.macaddr, ETH_ALEN);
 227     ret = fdt_setprop(fdt, node_off, "local-mac-address",
 228                       padded_mac, sizeof(padded_mac));
 229     if (ret < 0) {
 230         return ret;
 231     }
 232
 233     ret = fdt_setprop_cell(fdt, node_off, "ibm,mac-address-filters", 0);
 234     if (ret < 0) {
 235         return ret;
 236     }
 237
 238     return 0;
 239 }
 240
 241 static int check_bd(VIOsPAPRVLANDevice *dev, vlan_bd_t bd,
 242                     target_ulong alignment)
 243 {
 244     if ((VLAN_BD_ADDR(bd) % alignment)
 245         || (VLAN_BD_LEN(bd) % alignment)) {
 246         return -1;
 247     }
 248
 249     if (spapr_vio_check_tces(&dev->sdev, VLAN_BD_ADDR(bd),
 250                              VLAN_BD_LEN(bd), SPAPR_TCE_RW) != 0) {
 251         return -1;
 252     }
 253
 254     return 0;
 255 }
 256
 257 static target_ulong h_register_logical_lan(CPUState *env,
 258                                            sPAPREnvironment *spapr,
 259                                            target_ulong opcode,
 260                                            target_ulong *args)
 261 {
 262     target_ulong reg = args[0];
 263     target_ulong buf_list = args[1];
 264     target_ulong rec_queue = args[2];
 265     target_ulong filter_list = args[3];
 266     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 267     VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
 268     vlan_bd_t filter_list_bd;
 269
 270     if (!dev) {
 271         return H_PARAMETER;
 272     }
 273
 274     if (dev->isopen) {
 275         hcall_dprintf("H_REGISTER_LOGICAL_LAN called twice without "
 276                       "H_FREE_LOGICAL_LAN\n");
 277         return H_RESOURCE;
 278     }
 279
 280     if (check_bd(dev, VLAN_VALID_BD(buf_list, SPAPR_VIO_TCE_PAGE_SIZE),
 281                  SPAPR_VIO_TCE_PAGE_SIZE) < 0) {
 282         hcall_dprintf("Bad buf_list 0x" TARGET_FMT_lx " for "
 283                       "H_REGISTER_LOGICAL_LAN\n", buf_list);
 284         return H_PARAMETER;
 285     }
 286
 287     filter_list_bd = VLAN_VALID_BD(filter_list, SPAPR_VIO_TCE_PAGE_SIZE);
 288     if (check_bd(dev, filter_list_bd, SPAPR_VIO_TCE_PAGE_SIZE) < 0) {
 289         hcall_dprintf("Bad filter_list 0x" TARGET_FMT_lx " for "
 290                       "H_REGISTER_LOGICAL_LAN\n", filter_list);
 291         return H_PARAMETER;
 292     }
 293
 294     if (!(rec_queue & VLAN_BD_VALID)
 295         || (check_bd(dev, rec_queue, VLAN_RQ_ALIGNMENT) < 0)) {
 296         hcall_dprintf("Bad receive queue for H_REGISTER_LOGICAL_LAN\n");
 297         return H_PARAMETER;
 298     }
 299
 300     dev->buf_list = buf_list;
 301     sdev->signal_state = 0;
 302
 303     rec_queue &= ~VLAN_BD_TOGGLE;
 304
 305     /* Initialize the buffer list */
 306     stq_tce(sdev, buf_list, rec_queue);
 307     stq_tce(sdev, buf_list + 8, filter_list_bd);
 308     spapr_tce_dma_zero(sdev, buf_list + VLAN_RX_BDS_OFF,
 309                        SPAPR_VIO_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF);
 310     dev->add_buf_ptr = VLAN_RX_BDS_OFF - 8;
 311     dev->use_buf_ptr = VLAN_RX_BDS_OFF - 8;
 312     dev->rx_bufs = 0;
 313     dev->rxq_ptr = 0;
 314
 315     /* Initialize the receive queue */
 316     spapr_tce_dma_zero(sdev, VLAN_BD_ADDR(rec_queue), VLAN_BD_LEN(rec_queue));
 317
 318     dev->isopen = 1;
 319     return H_SUCCESS;
 320 }
 321
 322
 323 static target_ulong h_free_logical_lan(CPUState *env, sPAPREnvironment *spapr,
 324                                        target_ulong opcode, target_ulong *args)
 325 {
 326     target_ulong reg = args[0];
 327     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 328     VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
 329
 330     if (!dev) {
 331         return H_PARAMETER;
 332     }
 333
 334     if (!dev->isopen) {
 335         hcall_dprintf("H_FREE_LOGICAL_LAN called without "
 336                       "H_REGISTER_LOGICAL_LAN\n");
 337         return H_RESOURCE;
 338     }
 339
 340     dev->buf_list = 0;
 341     dev->rx_bufs = 0;
 342     dev->isopen = 0;
 343     return H_SUCCESS;
 344 }
 345
 346 static target_ulong h_add_logical_lan_buffer(CPUState *env,
 347                                              sPAPREnvironment *spapr,
 348                                              target_ulong opcode,
 349                                              target_ulong *args)
 350 {
 351     target_ulong reg = args[0];
 352     target_ulong buf = args[1];
 353     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 354     VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
 355     vlan_bd_t bd;
 356
 357     dprintf("H_ADD_LOGICAL_LAN_BUFFER(0x" TARGET_FMT_lx
 358             ", 0x" TARGET_FMT_lx ")\n", reg, buf);
 359
 360     if (!sdev) {
 361         hcall_dprintf("Wrong device in h_add_logical_lan_buffer\n");
 362         return H_PARAMETER;
 363     }
 364
 365     if ((check_bd(dev, buf, 4) < 0)
 366         || (VLAN_BD_LEN(buf) < 16)) {
 367         hcall_dprintf("Bad buffer enqueued in h_add_logical_lan_buffer\n");
 368         return H_PARAMETER;
 369     }
 370
 371     if (!dev->isopen || dev->rx_bufs >= VLAN_MAX_BUFS) {
 372         return H_RESOURCE;
 373     }
 374
 375     do {
 376         dev->add_buf_ptr += 8;
 377         if (dev->add_buf_ptr >= SPAPR_VIO_TCE_PAGE_SIZE) {
 378             dev->add_buf_ptr = VLAN_RX_BDS_OFF;
 379         }
 380
 381         bd = ldq_tce(sdev, dev->buf_list + dev->add_buf_ptr);
 382     } while (bd & VLAN_BD_VALID);
 383
 384     stq_tce(sdev, dev->buf_list + dev->add_buf_ptr, buf);
 385
 386     dev->rx_bufs++;
 387
 388     dprintf("h_add_logical_lan_buffer():  Added buf  ptr=%d  rx_bufs=%d"
 389             " bd=0x%016llx\n", dev->add_buf_ptr, dev->rx_bufs,
 390             (unsigned long long)buf);
 391
 392     return H_SUCCESS;
 393 }
 394
 395 static target_ulong h_send_logical_lan(CPUState *env, sPAPREnvironment *spapr,
 396                                        target_ulong opcode, target_ulong *args)
 397 {
 398     target_ulong reg = args[0];
 399     target_ulong *bufs = args + 1;
 400     target_ulong continue_token = args[7];
 401     VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 402     VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
 403     unsigned total_len;
 404     uint8_t *lbuf, *p;
 405     int i, nbufs;
 406     int ret;
 407
 408     dprintf("H_SEND_LOGICAL_LAN(0x" TARGET_FMT_lx ", <bufs>, 0x"
 409             TARGET_FMT_lx ")\n", reg, continue_token);
 410
 411     if (!sdev) {
 412         return H_PARAMETER;
 413     }
 414
 415     dprintf("rxbufs = %d\n", dev->rx_bufs);
 416
 417     if (!dev->isopen) {
 418         return H_DROPPED;
 419     }
 420
 421     if (continue_token) {
 422         return H_HARDWARE; /* FIXME actually handle this */
 423     }
 424
 425     total_len = 0;
 426     for (i = 0; i < 6; i++) {
 427         dprintf("   buf desc: 0x" TARGET_FMT_lx "\n", bufs[i]);
 428         if (!(bufs[i] & VLAN_BD_VALID)) {
 429             break;
 430         }
 431         total_len += VLAN_BD_LEN(bufs[i]);
 432     }
 433
 434     nbufs = i;
 435     dprintf("h_send_logical_lan() %d buffers, total length 0x%x\n",
 436             nbufs, total_len);
 437
 438     if (total_len == 0) {
 439         return H_SUCCESS;
 440     }
 441
 442     if (total_len > MAX_PACKET_SIZE) {
 443         /* Don't let the guest force too large an allocation */
 444         return H_RESOURCE;
 445     }
 446
 447     lbuf = alloca(total_len);
 448     p = lbuf;
 449     for (i = 0; i < nbufs; i++) {
 450         ret = spapr_tce_dma_read(sdev, VLAN_BD_ADDR(bufs[i]),
 451                                  p, VLAN_BD_LEN(bufs[i]));
 452         if (ret < 0) {
 453             return ret;
 454         }
 455
 456         p += VLAN_BD_LEN(bufs[i]);
 457     }
 458
 459     qemu_send_packet(&dev->nic->nc, lbuf, total_len);
 460
 461     return H_SUCCESS;
 462 }
 463
 464 static target_ulong h_multicast_ctrl(CPUState *env, sPAPREnvironment *spapr,
 465                                      target_ulong opcode, target_ulong *args)
 466 {
 467     target_ulong reg = args[0];
 468     VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 469
 470     if (!dev) {
 471         return H_PARAMETER;
 472     }
 473
 474     return H_SUCCESS;
 475 }
 476
 477 static VIOsPAPRDeviceInfo spapr_vlan = {
 478     .init = spapr_vlan_init,
 479     .devnode = spapr_vlan_devnode,
 480     .dt_name = "l-lan",
 481     .dt_type = "network",
 482     .dt_compatible = "IBM,l-lan",
 483     .signal_mask = 0x1,
 484     .qdev.name = "spapr-vlan",
 485     .qdev.size = sizeof(VIOsPAPRVLANDevice),
 486     .qdev.props = (Property[]) {
 487         DEFINE_SPAPR_PROPERTIES(VIOsPAPRVLANDevice, sdev, 0x1000, 0x10000000),
 488         DEFINE_NIC_PROPERTIES(VIOsPAPRVLANDevice, nicconf),
 489         DEFINE_PROP_END_OF_LIST(),
 490     },
 491 };
 492
 493 static void spapr_vlan_register(void)
 494 {
 495     spapr_vio_bus_register_withprop(&spapr_vlan);
 496     spapr_register_hypercall(H_REGISTER_LOGICAL_LAN, h_register_logical_lan);
 497     spapr_register_hypercall(H_FREE_LOGICAL_LAN, h_free_logical_lan);
 498     spapr_register_hypercall(H_SEND_LOGICAL_LAN, h_send_logical_lan);
 499     spapr_register_hypercall(H_ADD_LOGICAL_LAN_BUFFER,
 500                              h_add_logical_lan_buffer);
 501     spapr_register_hypercall(H_MULTICAST_CTRL, h_multicast_ctrl);
 502 }
 503 device_init(spapr_vlan_register);