1 /* 2 * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator 3 * 4 * PAPR Inter-VM Logical Lan, aka ibmveth 5 * 6 * Copyright (c) 2010,2011 David Gibson, IBM Corporation. 7 * 8 * Permission is hereby granted, free of charge, to any person obtaining a copy 9 * of this software and associated documentation files (the "Software"), to deal 10 * in the Software without restriction, including without limitation the rights 11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 12 * copies of the Software, and to permit persons to whom the Software is 13 * furnished to do so, subject to the following conditions: 14 * 15 * The above copyright notice and this permission notice shall be included in 16 * all copies or substantial portions of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 24 * THE SOFTWARE. 25 * 26 */ 27 28 #include "qemu/osdep.h" 29 #include "cpu.h" 30 #include "qemu/log.h" 31 #include "qemu/module.h" 32 #include "net/net.h" 33 #include "migration/vmstate.h" 34 #include "hw/ppc/spapr.h" 35 #include "hw/ppc/spapr_vio.h" 36 #include "hw/qdev-properties.h" 37 #include "sysemu/sysemu.h" 38 #include "trace.h" 39 40 #include <libfdt.h> 41 42 #define ETH_ALEN 6 43 #define MAX_PACKET_SIZE 65536 44 45 /* Compatibility flags for migration */ 46 #define SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT 0 47 #define SPAPRVLAN_FLAG_RX_BUF_POOLS (1 << SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT) 48 49 /* 50 * Virtual LAN device 51 */ 52 53 typedef uint64_t vlan_bd_t; 54 55 #define VLAN_BD_VALID 0x8000000000000000ULL 56 #define VLAN_BD_TOGGLE 0x4000000000000000ULL 57 #define VLAN_BD_NO_CSUM 0x0200000000000000ULL 58 #define VLAN_BD_CSUM_GOOD 0x0100000000000000ULL 59 #define VLAN_BD_LEN_MASK 0x00ffffff00000000ULL 60 #define VLAN_BD_LEN(bd) (((bd) & VLAN_BD_LEN_MASK) >> 32) 61 #define VLAN_BD_ADDR_MASK 0x00000000ffffffffULL 62 #define VLAN_BD_ADDR(bd) ((bd) & VLAN_BD_ADDR_MASK) 63 64 #define VLAN_VALID_BD(addr, len) (VLAN_BD_VALID | \ 65 (((len) << 32) & VLAN_BD_LEN_MASK) | \ 66 (addr & VLAN_BD_ADDR_MASK)) 67 68 #define VLAN_RXQC_TOGGLE 0x80 69 #define VLAN_RXQC_VALID 0x40 70 #define VLAN_RXQC_NO_CSUM 0x02 71 #define VLAN_RXQC_CSUM_GOOD 0x01 72 73 #define VLAN_RQ_ALIGNMENT 16 74 #define VLAN_RXQ_BD_OFF 0 75 #define VLAN_FILTER_BD_OFF 8 76 #define VLAN_RX_BDS_OFF 16 77 /* 78 * The final 8 bytes of the buffer list is a counter of frames dropped 79 * because there was not a buffer in the buffer list capable of holding 80 * the frame. We must avoid it, or the operating system will report garbage 81 * for this statistic. 82 */ 83 #define VLAN_RX_BDS_LEN (SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF - 8) 84 #define VLAN_MAX_BUFS (VLAN_RX_BDS_LEN / 8) 85 86 #define TYPE_VIO_SPAPR_VLAN_DEVICE "spapr-vlan" 87 #define VIO_SPAPR_VLAN_DEVICE(obj) \ 88 OBJECT_CHECK(SpaprVioVlan, (obj), TYPE_VIO_SPAPR_VLAN_DEVICE) 89 90 #define RX_POOL_MAX_BDS 4096 91 #define RX_MAX_POOLS 5 92 93 typedef struct { 94 int32_t bufsize; 95 int32_t count; 96 vlan_bd_t bds[RX_POOL_MAX_BDS]; 97 } RxBufPool; 98 99 typedef struct SpaprVioVlan { 100 SpaprVioDevice sdev; 101 NICConf nicconf; 102 NICState *nic; 103 MACAddr perm_mac; 104 bool isopen; 105 hwaddr buf_list; 106 uint32_t add_buf_ptr, use_buf_ptr, rx_bufs; 107 hwaddr rxq_ptr; 108 QEMUTimer *rxp_timer; 109 uint32_t compat_flags; /* Compatibility flags for migration */ 110 RxBufPool *rx_pool[RX_MAX_POOLS]; /* Receive buffer descriptor pools */ 111 } SpaprVioVlan; 112 113 static bool spapr_vlan_can_receive(NetClientState *nc) 114 { 115 SpaprVioVlan *dev = qemu_get_nic_opaque(nc); 116 117 return dev->isopen && dev->rx_bufs > 0; 118 } 119 120 /** 121 * The last 8 bytes of the receive buffer list page (that has been 122 * supplied by the guest with the H_REGISTER_LOGICAL_LAN call) contain 123 * a counter for frames that have been dropped because there was no 124 * suitable receive buffer available. This function is used to increase 125 * this counter by one. 126 */ 127 static void spapr_vlan_record_dropped_rx_frame(SpaprVioVlan *dev) 128 { 129 uint64_t cnt; 130 131 cnt = vio_ldq(&dev->sdev, dev->buf_list + 4096 - 8); 132 vio_stq(&dev->sdev, dev->buf_list + 4096 - 8, cnt + 1); 133 } 134 135 /** 136 * Get buffer descriptor from one of our receive buffer pools 137 */ 138 static vlan_bd_t spapr_vlan_get_rx_bd_from_pool(SpaprVioVlan *dev, 139 size_t size) 140 { 141 vlan_bd_t bd; 142 int pool; 143 144 for (pool = 0; pool < RX_MAX_POOLS; pool++) { 145 if (dev->rx_pool[pool]->count > 0 && 146 dev->rx_pool[pool]->bufsize >= size + 8) { 147 break; 148 } 149 } 150 if (pool == RX_MAX_POOLS) { 151 /* Failed to find a suitable buffer */ 152 return 0; 153 } 154 155 156 trace_spapr_vlan_get_rx_bd_from_pool_found(pool, 157 dev->rx_pool[pool]->count, 158 dev->rx_bufs); 159 160 /* Remove the buffer from the pool */ 161 dev->rx_pool[pool]->count--; 162 bd = dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count]; 163 dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count] = 0; 164 165 return bd; 166 } 167 168 /** 169 * Get buffer descriptor from the receive buffer list page that has been 170 * supplied by the guest with the H_REGISTER_LOGICAL_LAN call 171 */ 172 static vlan_bd_t spapr_vlan_get_rx_bd_from_page(SpaprVioVlan *dev, 173 size_t size) 174 { 175 int buf_ptr = dev->use_buf_ptr; 176 vlan_bd_t bd; 177 178 do { 179 buf_ptr += 8; 180 if (buf_ptr >= VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF) { 181 buf_ptr = VLAN_RX_BDS_OFF; 182 } 183 184 bd = vio_ldq(&dev->sdev, dev->buf_list + buf_ptr); 185 186 trace_spapr_vlan_get_rx_bd_from_page(buf_ptr, (uint64_t)bd); 187 } while ((!(bd & VLAN_BD_VALID) || VLAN_BD_LEN(bd) < size + 8) 188 && buf_ptr != dev->use_buf_ptr); 189 190 if (!(bd & VLAN_BD_VALID) || VLAN_BD_LEN(bd) < size + 8) { 191 /* Failed to find a suitable buffer */ 192 return 0; 193 } 194 195 /* Remove the buffer from the pool */ 196 dev->use_buf_ptr = buf_ptr; 197 vio_stq(&dev->sdev, dev->buf_list + dev->use_buf_ptr, 0); 198 199 trace_spapr_vlan_get_rx_bd_from_page_found(dev->use_buf_ptr, dev->rx_bufs); 200 201 return bd; 202 } 203 204 static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf, 205 size_t size) 206 { 207 SpaprVioVlan *dev = qemu_get_nic_opaque(nc); 208 SpaprVioDevice *sdev = VIO_SPAPR_DEVICE(dev); 209 vlan_bd_t rxq_bd = vio_ldq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF); 210 vlan_bd_t bd; 211 uint64_t handle; 212 uint8_t control; 213 214 trace_spapr_vlan_receive(sdev->qdev.id, dev->rx_bufs); 215 216 if (!dev->isopen) { 217 return -1; 218 } 219 220 if (!dev->rx_bufs) { 221 spapr_vlan_record_dropped_rx_frame(dev); 222 return 0; 223 } 224 225 if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) { 226 bd = spapr_vlan_get_rx_bd_from_pool(dev, size); 227 } else { 228 bd = spapr_vlan_get_rx_bd_from_page(dev, size); 229 } 230 if (!bd) { 231 spapr_vlan_record_dropped_rx_frame(dev); 232 return 0; 233 } 234 235 dev->rx_bufs--; 236 237 /* Transfer the packet data */ 238 if (spapr_vio_dma_write(sdev, VLAN_BD_ADDR(bd) + 8, buf, size) < 0) { 239 return -1; 240 } 241 242 trace_spapr_vlan_receive_dma_completed(); 243 244 /* Update the receive queue */ 245 control = VLAN_RXQC_TOGGLE | VLAN_RXQC_VALID; 246 if (rxq_bd & VLAN_BD_TOGGLE) { 247 control ^= VLAN_RXQC_TOGGLE; 248 } 249 250 handle = vio_ldq(sdev, VLAN_BD_ADDR(bd)); 251 vio_stq(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 8, handle); 252 vio_stl(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 4, size); 253 vio_sth(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 2, 8); 254 vio_stb(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr, control); 255 256 trace_spapr_vlan_receive_wrote(dev->rxq_ptr, 257 vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) + 258 dev->rxq_ptr), 259 vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) + 260 dev->rxq_ptr + 8)); 261 262 dev->rxq_ptr += 16; 263 if (dev->rxq_ptr >= VLAN_BD_LEN(rxq_bd)) { 264 dev->rxq_ptr = 0; 265 vio_stq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF, rxq_bd ^ VLAN_BD_TOGGLE); 266 } 267 268 if (sdev->signal_state & 1) { 269 spapr_vio_irq_pulse(sdev); 270 } 271 272 return size; 273 } 274 275 static NetClientInfo net_spapr_vlan_info = { 276 .type = NET_CLIENT_DRIVER_NIC, 277 .size = sizeof(NICState), 278 .can_receive = spapr_vlan_can_receive, 279 .receive = spapr_vlan_receive, 280 }; 281 282 static void spapr_vlan_flush_rx_queue(void *opaque) 283 { 284 SpaprVioVlan *dev = opaque; 285 286 qemu_flush_queued_packets(qemu_get_queue(dev->nic)); 287 } 288 289 static void spapr_vlan_reset_rx_pool(RxBufPool *rxp) 290 { 291 /* 292 * Use INT_MAX as bufsize so that unused buffers are moved to the end 293 * of the list during the qsort in spapr_vlan_add_rxbuf_to_pool() later. 294 */ 295 rxp->bufsize = INT_MAX; 296 rxp->count = 0; 297 memset(rxp->bds, 0, sizeof(rxp->bds)); 298 } 299 300 static void spapr_vlan_reset(SpaprVioDevice *sdev) 301 { 302 SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev); 303 int i; 304 305 dev->buf_list = 0; 306 dev->rx_bufs = 0; 307 dev->isopen = 0; 308 309 if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) { 310 for (i = 0; i < RX_MAX_POOLS; i++) { 311 spapr_vlan_reset_rx_pool(dev->rx_pool[i]); 312 } 313 } 314 315 memcpy(&dev->nicconf.macaddr.a, &dev->perm_mac.a, 316 sizeof(dev->nicconf.macaddr.a)); 317 qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a); 318 } 319 320 static void spapr_vlan_realize(SpaprVioDevice *sdev, Error **errp) 321 { 322 SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev); 323 324 qemu_macaddr_default_if_unset(&dev->nicconf.macaddr); 325 326 memcpy(&dev->perm_mac.a, &dev->nicconf.macaddr.a, sizeof(dev->perm_mac.a)); 327 328 dev->nic = qemu_new_nic(&net_spapr_vlan_info, &dev->nicconf, 329 object_get_typename(OBJECT(sdev)), sdev->qdev.id, dev); 330 qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a); 331 332 dev->rxp_timer = timer_new_us(QEMU_CLOCK_VIRTUAL, spapr_vlan_flush_rx_queue, 333 dev); 334 } 335 336 static void spapr_vlan_instance_init(Object *obj) 337 { 338 SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(obj); 339 int i; 340 341 device_add_bootindex_property(obj, &dev->nicconf.bootindex, 342 "bootindex", "", 343 DEVICE(dev), NULL); 344 345 if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) { 346 for (i = 0; i < RX_MAX_POOLS; i++) { 347 dev->rx_pool[i] = g_new(RxBufPool, 1); 348 spapr_vlan_reset_rx_pool(dev->rx_pool[i]); 349 } 350 } 351 } 352 353 static void spapr_vlan_instance_finalize(Object *obj) 354 { 355 SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(obj); 356 int i; 357 358 if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) { 359 for (i = 0; i < RX_MAX_POOLS; i++) { 360 g_free(dev->rx_pool[i]); 361 dev->rx_pool[i] = NULL; 362 } 363 } 364 365 if (dev->rxp_timer) { 366 timer_del(dev->rxp_timer); 367 timer_free(dev->rxp_timer); 368 } 369 } 370 371 void spapr_vlan_create(SpaprVioBus *bus, NICInfo *nd) 372 { 373 DeviceState *dev; 374 375 dev = qdev_create(&bus->bus, "spapr-vlan"); 376 377 qdev_set_nic_properties(dev, nd); 378 379 qdev_init_nofail(dev); 380 } 381 382 static int spapr_vlan_devnode(SpaprVioDevice *dev, void *fdt, int node_off) 383 { 384 SpaprVioVlan *vdev = VIO_SPAPR_VLAN_DEVICE(dev); 385 uint8_t padded_mac[8] = {0, 0}; 386 int ret; 387 388 /* Some old phyp versions give the mac address in an 8-byte 389 * property. The kernel driver (before 3.10) has an insane workaround; 390 * rather than doing the obvious thing and checking the property 391 * length, it checks whether the first byte has 0b10 in the low 392 * bits. If a correct 6-byte property has a different first byte 393 * the kernel will get the wrong mac address, overrunning its 394 * buffer in the process (read only, thank goodness). 395 * 396 * Here we return a 6-byte address unless that would break a pre-3.10 397 * driver. In that case we return a padded 8-byte address to allow the old 398 * workaround to succeed. */ 399 if ((vdev->nicconf.macaddr.a[0] & 0x3) == 0x2) { 400 ret = fdt_setprop(fdt, node_off, "local-mac-address", 401 &vdev->nicconf.macaddr, ETH_ALEN); 402 } else { 403 memcpy(&padded_mac[2], &vdev->nicconf.macaddr, ETH_ALEN); 404 ret = fdt_setprop(fdt, node_off, "local-mac-address", 405 padded_mac, sizeof(padded_mac)); 406 } 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(SpaprVioVlan *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 SpaprVioDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 447 SpaprVioVlan *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 SpaprVioDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 509 SpaprVioVlan *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(SpaprVioVlan *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(SpaprVioVlan *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 in the meantime, 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 trace_spapr_vlan_add_rxbuf_to_pool_create(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 trace_spapr_vlan_add_rxbuf_to_pool(pool, VLAN_BD_LEN(buf), 595 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(SpaprVioVlan *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 trace_spapr_vlan_add_rxbuf_to_page(dev->add_buf_ptr, dev->rx_bufs, buf); 627 628 return 0; 629 } 630 631 static target_ulong h_add_logical_lan_buffer(PowerPCCPU *cpu, 632 SpaprMachineState *spapr, 633 target_ulong opcode, 634 target_ulong *args) 635 { 636 target_ulong reg = args[0]; 637 target_ulong buf = args[1]; 638 SpaprVioDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 639 SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev); 640 target_long ret; 641 642 trace_spapr_vlan_h_add_logical_lan_buffer(reg, buf); 643 644 if (!sdev) { 645 hcall_dprintf("Bad device\n"); 646 return H_PARAMETER; 647 } 648 649 if ((check_bd(dev, buf, 4) < 0) 650 || (VLAN_BD_LEN(buf) < 16)) { 651 hcall_dprintf("Bad buffer enqueued\n"); 652 return H_PARAMETER; 653 } 654 655 if (!dev->isopen) { 656 return H_RESOURCE; 657 } 658 659 if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) { 660 ret = spapr_vlan_add_rxbuf_to_pool(dev, buf); 661 } else { 662 ret = spapr_vlan_add_rxbuf_to_page(dev, buf); 663 } 664 if (ret) { 665 return ret; 666 } 667 668 dev->rx_bufs++; 669 670 /* 671 * Give guest some more time to add additional RX buffers before we 672 * flush the receive queue, so that e.g. fragmented IP packets can 673 * be passed to the guest in one go later (instead of passing single 674 * fragments if there is only one receive buffer available). 675 */ 676 timer_mod(dev->rxp_timer, qemu_clock_get_us(QEMU_CLOCK_VIRTUAL) + 500); 677 678 return H_SUCCESS; 679 } 680 681 static target_ulong h_send_logical_lan(PowerPCCPU *cpu, 682 SpaprMachineState *spapr, 683 target_ulong opcode, target_ulong *args) 684 { 685 target_ulong reg = args[0]; 686 target_ulong *bufs = args + 1; 687 target_ulong continue_token = args[7]; 688 SpaprVioDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 689 SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev); 690 unsigned total_len; 691 uint8_t *lbuf, *p; 692 int i, nbufs; 693 int ret; 694 695 trace_spapr_vlan_h_send_logical_lan(reg, continue_token); 696 697 if (!sdev) { 698 return H_PARAMETER; 699 } 700 701 trace_spapr_vlan_h_send_logical_lan_rxbufs(dev->rx_bufs); 702 703 if (!dev->isopen) { 704 return H_DROPPED; 705 } 706 707 if (continue_token) { 708 return H_HARDWARE; /* FIXME actually handle this */ 709 } 710 711 total_len = 0; 712 for (i = 0; i < 6; i++) { 713 trace_spapr_vlan_h_send_logical_lan_buf_desc(bufs[i]); 714 if (!(bufs[i] & VLAN_BD_VALID)) { 715 break; 716 } 717 total_len += VLAN_BD_LEN(bufs[i]); 718 } 719 720 nbufs = i; 721 trace_spapr_vlan_h_send_logical_lan_total(nbufs, total_len); 722 723 if (total_len == 0) { 724 return H_SUCCESS; 725 } 726 727 if (total_len > MAX_PACKET_SIZE) { 728 /* Don't let the guest force too large an allocation */ 729 return H_RESOURCE; 730 } 731 732 lbuf = alloca(total_len); 733 p = lbuf; 734 for (i = 0; i < nbufs; i++) { 735 ret = spapr_vio_dma_read(sdev, VLAN_BD_ADDR(bufs[i]), 736 p, VLAN_BD_LEN(bufs[i])); 737 if (ret < 0) { 738 return ret; 739 } 740 741 p += VLAN_BD_LEN(bufs[i]); 742 } 743 744 qemu_send_packet(qemu_get_queue(dev->nic), lbuf, total_len); 745 746 return H_SUCCESS; 747 } 748 749 static target_ulong h_multicast_ctrl(PowerPCCPU *cpu, SpaprMachineState *spapr, 750 target_ulong opcode, target_ulong *args) 751 { 752 target_ulong reg = args[0]; 753 SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 754 755 if (!dev) { 756 return H_PARAMETER; 757 } 758 759 return H_SUCCESS; 760 } 761 762 static target_ulong h_change_logical_lan_mac(PowerPCCPU *cpu, 763 SpaprMachineState *spapr, 764 target_ulong opcode, 765 target_ulong *args) 766 { 767 target_ulong reg = args[0]; 768 target_ulong macaddr = args[1]; 769 SpaprVioDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 770 SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev); 771 int i; 772 773 for (i = 0; i < ETH_ALEN; i++) { 774 dev->nicconf.macaddr.a[ETH_ALEN - i - 1] = macaddr & 0xff; 775 macaddr >>= 8; 776 } 777 778 qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a); 779 780 return H_SUCCESS; 781 } 782 783 static Property spapr_vlan_properties[] = { 784 DEFINE_SPAPR_PROPERTIES(SpaprVioVlan, sdev), 785 DEFINE_NIC_PROPERTIES(SpaprVioVlan, nicconf), 786 DEFINE_PROP_BIT("use-rx-buffer-pools", SpaprVioVlan, 787 compat_flags, SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT, true), 788 DEFINE_PROP_END_OF_LIST(), 789 }; 790 791 static bool spapr_vlan_rx_buffer_pools_needed(void *opaque) 792 { 793 SpaprVioVlan *dev = opaque; 794 795 return (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) != 0; 796 } 797 798 static const VMStateDescription vmstate_rx_buffer_pool = { 799 .name = "spapr_llan/rx_buffer_pool", 800 .version_id = 1, 801 .minimum_version_id = 1, 802 .needed = spapr_vlan_rx_buffer_pools_needed, 803 .fields = (VMStateField[]) { 804 VMSTATE_INT32(bufsize, RxBufPool), 805 VMSTATE_INT32(count, RxBufPool), 806 VMSTATE_UINT64_ARRAY(bds, RxBufPool, RX_POOL_MAX_BDS), 807 VMSTATE_END_OF_LIST() 808 } 809 }; 810 811 static const VMStateDescription vmstate_rx_pools = { 812 .name = "spapr_llan/rx_pools", 813 .version_id = 1, 814 .minimum_version_id = 1, 815 .needed = spapr_vlan_rx_buffer_pools_needed, 816 .fields = (VMStateField[]) { 817 VMSTATE_ARRAY_OF_POINTER_TO_STRUCT(rx_pool, SpaprVioVlan, 818 RX_MAX_POOLS, 1, 819 vmstate_rx_buffer_pool, RxBufPool), 820 VMSTATE_END_OF_LIST() 821 } 822 }; 823 824 static const VMStateDescription vmstate_spapr_llan = { 825 .name = "spapr_llan", 826 .version_id = 1, 827 .minimum_version_id = 1, 828 .fields = (VMStateField[]) { 829 VMSTATE_SPAPR_VIO(sdev, SpaprVioVlan), 830 /* LLAN state */ 831 VMSTATE_BOOL(isopen, SpaprVioVlan), 832 VMSTATE_UINT64(buf_list, SpaprVioVlan), 833 VMSTATE_UINT32(add_buf_ptr, SpaprVioVlan), 834 VMSTATE_UINT32(use_buf_ptr, SpaprVioVlan), 835 VMSTATE_UINT32(rx_bufs, SpaprVioVlan), 836 VMSTATE_UINT64(rxq_ptr, SpaprVioVlan), 837 838 VMSTATE_END_OF_LIST() 839 }, 840 .subsections = (const VMStateDescription * []) { 841 &vmstate_rx_pools, 842 NULL 843 } 844 }; 845 846 static void spapr_vlan_class_init(ObjectClass *klass, void *data) 847 { 848 DeviceClass *dc = DEVICE_CLASS(klass); 849 SpaprVioDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass); 850 851 k->realize = spapr_vlan_realize; 852 k->reset = spapr_vlan_reset; 853 k->devnode = spapr_vlan_devnode; 854 k->dt_name = "l-lan"; 855 k->dt_type = "network"; 856 k->dt_compatible = "IBM,l-lan"; 857 k->signal_mask = 0x1; 858 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 859 device_class_set_props(dc, spapr_vlan_properties); 860 k->rtce_window_size = 0x10000000; 861 dc->vmsd = &vmstate_spapr_llan; 862 } 863 864 static const TypeInfo spapr_vlan_info = { 865 .name = TYPE_VIO_SPAPR_VLAN_DEVICE, 866 .parent = TYPE_VIO_SPAPR_DEVICE, 867 .instance_size = sizeof(SpaprVioVlan), 868 .class_init = spapr_vlan_class_init, 869 .instance_init = spapr_vlan_instance_init, 870 .instance_finalize = spapr_vlan_instance_finalize, 871 }; 872 873 static void spapr_vlan_register_types(void) 874 { 875 spapr_register_hypercall(H_REGISTER_LOGICAL_LAN, h_register_logical_lan); 876 spapr_register_hypercall(H_FREE_LOGICAL_LAN, h_free_logical_lan); 877 spapr_register_hypercall(H_SEND_LOGICAL_LAN, h_send_logical_lan); 878 spapr_register_hypercall(H_ADD_LOGICAL_LAN_BUFFER, 879 h_add_logical_lan_buffer); 880 spapr_register_hypercall(H_MULTICAST_CTRL, h_multicast_ctrl); 881 spapr_register_hypercall(H_CHANGE_LOGICAL_LAN_MAC, 882 h_change_logical_lan_mac); 883 type_register_static(&spapr_vlan_info); 884 } 885 886 type_init(spapr_vlan_register_types) 887