1 /* 2 * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator 3 * 4 * PAPR Inter-VM Logical Lan, aka ibmveth 5 * 6 * Copyright (c) 2010,2011 David Gibson, IBM Corporation. 7 * 8 * Permission is hereby granted, free of charge, to any person obtaining a copy 9 * of this software and associated documentation files (the "Software"), to deal 10 * in the Software without restriction, including without limitation the rights 11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 12 * copies of the Software, and to permit persons to whom the Software is 13 * furnished to do so, subject to the following conditions: 14 * 15 * The above copyright notice and this permission notice shall be included in 16 * all copies or substantial portions of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 24 * THE SOFTWARE. 25 * 26 */ 27 #include "qemu/osdep.h" 28 #include "qemu-common.h" 29 #include "cpu.h" 30 #include "hw/hw.h" 31 #include "qemu/log.h" 32 #include "net/net.h" 33 #include "hw/qdev.h" 34 #include "hw/ppc/spapr.h" 35 #include "hw/ppc/spapr_vio.h" 36 #include "sysemu/sysemu.h" 37 #include "trace.h" 38 39 #include <libfdt.h> 40 41 #define ETH_ALEN 6 42 #define MAX_PACKET_SIZE 65536 43 44 /* Compatibility flags for migration */ 45 #define SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT 0 46 #define SPAPRVLAN_FLAG_RX_BUF_POOLS (1 << SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT) 47 48 /* 49 * Virtual LAN device 50 */ 51 52 typedef uint64_t vlan_bd_t; 53 54 #define VLAN_BD_VALID 0x8000000000000000ULL 55 #define VLAN_BD_TOGGLE 0x4000000000000000ULL 56 #define VLAN_BD_NO_CSUM 0x0200000000000000ULL 57 #define VLAN_BD_CSUM_GOOD 0x0100000000000000ULL 58 #define VLAN_BD_LEN_MASK 0x00ffffff00000000ULL 59 #define VLAN_BD_LEN(bd) (((bd) & VLAN_BD_LEN_MASK) >> 32) 60 #define VLAN_BD_ADDR_MASK 0x00000000ffffffffULL 61 #define VLAN_BD_ADDR(bd) ((bd) & VLAN_BD_ADDR_MASK) 62 63 #define VLAN_VALID_BD(addr, len) (VLAN_BD_VALID | \ 64 (((len) << 32) & VLAN_BD_LEN_MASK) | \ 65 (addr & VLAN_BD_ADDR_MASK)) 66 67 #define VLAN_RXQC_TOGGLE 0x80 68 #define VLAN_RXQC_VALID 0x40 69 #define VLAN_RXQC_NO_CSUM 0x02 70 #define VLAN_RXQC_CSUM_GOOD 0x01 71 72 #define VLAN_RQ_ALIGNMENT 16 73 #define VLAN_RXQ_BD_OFF 0 74 #define VLAN_FILTER_BD_OFF 8 75 #define VLAN_RX_BDS_OFF 16 76 /* 77 * The final 8 bytes of the buffer list is a counter of frames dropped 78 * because there was not a buffer in the buffer list capable of holding 79 * the frame. We must avoid it, or the operating system will report garbage 80 * for this statistic. 81 */ 82 #define VLAN_RX_BDS_LEN (SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF - 8) 83 #define VLAN_MAX_BUFS (VLAN_RX_BDS_LEN / 8) 84 85 #define TYPE_VIO_SPAPR_VLAN_DEVICE "spapr-vlan" 86 #define VIO_SPAPR_VLAN_DEVICE(obj) \ 87 OBJECT_CHECK(VIOsPAPRVLANDevice, (obj), TYPE_VIO_SPAPR_VLAN_DEVICE) 88 89 #define RX_POOL_MAX_BDS 4096 90 #define RX_MAX_POOLS 5 91 92 typedef struct { 93 int32_t bufsize; 94 int32_t count; 95 vlan_bd_t bds[RX_POOL_MAX_BDS]; 96 } RxBufPool; 97 98 typedef struct VIOsPAPRVLANDevice { 99 VIOsPAPRDevice sdev; 100 NICConf nicconf; 101 NICState *nic; 102 MACAddr perm_mac; 103 bool isopen; 104 hwaddr buf_list; 105 uint32_t add_buf_ptr, use_buf_ptr, rx_bufs; 106 hwaddr rxq_ptr; 107 QEMUTimer *rxp_timer; 108 uint32_t compat_flags; /* Compatibility flags for migration */ 109 RxBufPool *rx_pool[RX_MAX_POOLS]; /* Receive buffer descriptor pools */ 110 } VIOsPAPRVLANDevice; 111 112 static int spapr_vlan_can_receive(NetClientState *nc) 113 { 114 VIOsPAPRVLANDevice *dev = qemu_get_nic_opaque(nc); 115 116 return (dev->isopen && dev->rx_bufs > 0); 117 } 118 119 /** 120 * The last 8 bytes of the receive buffer list page (that has been 121 * supplied by the guest with the H_REGISTER_LOGICAL_LAN call) contain 122 * a counter for frames that have been dropped because there was no 123 * suitable receive buffer available. This function is used to increase 124 * this counter by one. 125 */ 126 static void spapr_vlan_record_dropped_rx_frame(VIOsPAPRVLANDevice *dev) 127 { 128 uint64_t cnt; 129 130 cnt = vio_ldq(&dev->sdev, dev->buf_list + 4096 - 8); 131 vio_stq(&dev->sdev, dev->buf_list + 4096 - 8, cnt + 1); 132 } 133 134 /** 135 * Get buffer descriptor from one of our receive buffer pools 136 */ 137 static vlan_bd_t spapr_vlan_get_rx_bd_from_pool(VIOsPAPRVLANDevice *dev, 138 size_t size) 139 { 140 vlan_bd_t bd; 141 int pool; 142 143 for (pool = 0; pool < RX_MAX_POOLS; pool++) { 144 if (dev->rx_pool[pool]->count > 0 && 145 dev->rx_pool[pool]->bufsize >= size + 8) { 146 break; 147 } 148 } 149 if (pool == RX_MAX_POOLS) { 150 /* Failed to find a suitable buffer */ 151 return 0; 152 } 153 154 155 trace_spapr_vlan_get_rx_bd_from_pool_found(pool, 156 dev->rx_pool[pool]->count, 157 dev->rx_bufs); 158 159 /* Remove the buffer from the pool */ 160 dev->rx_pool[pool]->count--; 161 bd = dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count]; 162 dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count] = 0; 163 164 return bd; 165 } 166 167 /** 168 * Get buffer descriptor from the receive buffer list page that has been 169 * supplied by the guest with the H_REGISTER_LOGICAL_LAN call 170 */ 171 static vlan_bd_t spapr_vlan_get_rx_bd_from_page(VIOsPAPRVLANDevice *dev, 172 size_t size) 173 { 174 int buf_ptr = dev->use_buf_ptr; 175 vlan_bd_t bd; 176 177 do { 178 buf_ptr += 8; 179 if (buf_ptr >= VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF) { 180 buf_ptr = VLAN_RX_BDS_OFF; 181 } 182 183 bd = vio_ldq(&dev->sdev, dev->buf_list + buf_ptr); 184 185 trace_spapr_vlan_get_rx_bd_from_page(buf_ptr, (uint64_t)bd); 186 } while ((!(bd & VLAN_BD_VALID) || VLAN_BD_LEN(bd) < size + 8) 187 && buf_ptr != dev->use_buf_ptr); 188 189 if (!(bd & VLAN_BD_VALID) || VLAN_BD_LEN(bd) < size + 8) { 190 /* Failed to find a suitable buffer */ 191 return 0; 192 } 193 194 /* Remove the buffer from the pool */ 195 dev->use_buf_ptr = buf_ptr; 196 vio_stq(&dev->sdev, dev->buf_list + dev->use_buf_ptr, 0); 197 198 trace_spapr_vlan_get_rx_bd_from_page_found(dev->use_buf_ptr, dev->rx_bufs); 199 200 return bd; 201 } 202 203 static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf, 204 size_t size) 205 { 206 VIOsPAPRVLANDevice *dev = qemu_get_nic_opaque(nc); 207 VIOsPAPRDevice *sdev = VIO_SPAPR_DEVICE(dev); 208 vlan_bd_t rxq_bd = vio_ldq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF); 209 vlan_bd_t bd; 210 uint64_t handle; 211 uint8_t control; 212 213 trace_spapr_vlan_receive(sdev->qdev.id, dev->rx_bufs); 214 215 if (!dev->isopen) { 216 return -1; 217 } 218 219 if (!dev->rx_bufs) { 220 spapr_vlan_record_dropped_rx_frame(dev); 221 return 0; 222 } 223 224 if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) { 225 bd = spapr_vlan_get_rx_bd_from_pool(dev, size); 226 } else { 227 bd = spapr_vlan_get_rx_bd_from_page(dev, size); 228 } 229 if (!bd) { 230 spapr_vlan_record_dropped_rx_frame(dev); 231 return 0; 232 } 233 234 dev->rx_bufs--; 235 236 /* Transfer the packet data */ 237 if (spapr_vio_dma_write(sdev, VLAN_BD_ADDR(bd) + 8, buf, size) < 0) { 238 return -1; 239 } 240 241 trace_spapr_vlan_receive_dma_completed(); 242 243 /* Update the receive queue */ 244 control = VLAN_RXQC_TOGGLE | VLAN_RXQC_VALID; 245 if (rxq_bd & VLAN_BD_TOGGLE) { 246 control ^= VLAN_RXQC_TOGGLE; 247 } 248 249 handle = vio_ldq(sdev, VLAN_BD_ADDR(bd)); 250 vio_stq(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 8, handle); 251 vio_stl(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 4, size); 252 vio_sth(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 2, 8); 253 vio_stb(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr, control); 254 255 trace_spapr_vlan_receive_wrote(dev->rxq_ptr, 256 vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) + 257 dev->rxq_ptr), 258 vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) + 259 dev->rxq_ptr + 8)); 260 261 dev->rxq_ptr += 16; 262 if (dev->rxq_ptr >= VLAN_BD_LEN(rxq_bd)) { 263 dev->rxq_ptr = 0; 264 vio_stq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF, rxq_bd ^ VLAN_BD_TOGGLE); 265 } 266 267 if (sdev->signal_state & 1) { 268 qemu_irq_pulse(spapr_vio_qirq(sdev)); 269 } 270 271 return size; 272 } 273 274 static NetClientInfo net_spapr_vlan_info = { 275 .type = NET_CLIENT_DRIVER_NIC, 276 .size = sizeof(NICState), 277 .can_receive = spapr_vlan_can_receive, 278 .receive = spapr_vlan_receive, 279 }; 280 281 static void spapr_vlan_flush_rx_queue(void *opaque) 282 { 283 VIOsPAPRVLANDevice *dev = opaque; 284 285 qemu_flush_queued_packets(qemu_get_queue(dev->nic)); 286 } 287 288 static void spapr_vlan_reset_rx_pool(RxBufPool *rxp) 289 { 290 /* 291 * Use INT_MAX as bufsize so that unused buffers are moved to the end 292 * of the list during the qsort in spapr_vlan_add_rxbuf_to_pool() later. 293 */ 294 rxp->bufsize = INT_MAX; 295 rxp->count = 0; 296 memset(rxp->bds, 0, sizeof(rxp->bds)); 297 } 298 299 static void spapr_vlan_reset(VIOsPAPRDevice *sdev) 300 { 301 VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev); 302 int i; 303 304 dev->buf_list = 0; 305 dev->rx_bufs = 0; 306 dev->isopen = 0; 307 308 if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) { 309 for (i = 0; i < RX_MAX_POOLS; i++) { 310 spapr_vlan_reset_rx_pool(dev->rx_pool[i]); 311 } 312 } 313 314 memcpy(&dev->nicconf.macaddr.a, &dev->perm_mac.a, 315 sizeof(dev->nicconf.macaddr.a)); 316 qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a); 317 } 318 319 static void spapr_vlan_realize(VIOsPAPRDevice *sdev, Error **errp) 320 { 321 VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev); 322 323 qemu_macaddr_default_if_unset(&dev->nicconf.macaddr); 324 325 memcpy(&dev->perm_mac.a, &dev->nicconf.macaddr.a, sizeof(dev->perm_mac.a)); 326 327 dev->nic = qemu_new_nic(&net_spapr_vlan_info, &dev->nicconf, 328 object_get_typename(OBJECT(sdev)), sdev->qdev.id, dev); 329 qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a); 330 331 dev->rxp_timer = timer_new_us(QEMU_CLOCK_VIRTUAL, spapr_vlan_flush_rx_queue, 332 dev); 333 } 334 335 static void spapr_vlan_instance_init(Object *obj) 336 { 337 VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(obj); 338 int i; 339 340 device_add_bootindex_property(obj, &dev->nicconf.bootindex, 341 "bootindex", "", 342 DEVICE(dev), NULL); 343 344 if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) { 345 for (i = 0; i < RX_MAX_POOLS; i++) { 346 dev->rx_pool[i] = g_new(RxBufPool, 1); 347 spapr_vlan_reset_rx_pool(dev->rx_pool[i]); 348 } 349 } 350 } 351 352 static void spapr_vlan_instance_finalize(Object *obj) 353 { 354 VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(obj); 355 int i; 356 357 if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) { 358 for (i = 0; i < RX_MAX_POOLS; i++) { 359 g_free(dev->rx_pool[i]); 360 dev->rx_pool[i] = NULL; 361 } 362 } 363 364 if (dev->rxp_timer) { 365 timer_del(dev->rxp_timer); 366 timer_free(dev->rxp_timer); 367 } 368 } 369 370 void spapr_vlan_create(VIOsPAPRBus *bus, NICInfo *nd) 371 { 372 DeviceState *dev; 373 374 dev = qdev_create(&bus->bus, "spapr-vlan"); 375 376 qdev_set_nic_properties(dev, nd); 377 378 qdev_init_nofail(dev); 379 } 380 381 static int spapr_vlan_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off) 382 { 383 VIOsPAPRVLANDevice *vdev = VIO_SPAPR_VLAN_DEVICE(dev); 384 uint8_t padded_mac[8] = {0, 0}; 385 int ret; 386 387 /* Some old phyp versions give the mac address in an 8-byte 388 * property. The kernel driver (before 3.10) has an insane workaround; 389 * rather than doing the obvious thing and checking the property 390 * length, it checks whether the first byte has 0b10 in the low 391 * bits. If a correct 6-byte property has a different first byte 392 * the kernel will get the wrong mac address, overrunning its 393 * buffer in the process (read only, thank goodness). 394 * 395 * Here we return a 6-byte address unless that would break a pre-3.10 396 * driver. In that case we return a padded 8-byte address to allow the old 397 * workaround to succeed. */ 398 if ((vdev->nicconf.macaddr.a[0] & 0x3) == 0x2) { 399 ret = fdt_setprop(fdt, node_off, "local-mac-address", 400 &vdev->nicconf.macaddr, ETH_ALEN); 401 } else { 402 memcpy(&padded_mac[2], &vdev->nicconf.macaddr, ETH_ALEN); 403 ret = fdt_setprop(fdt, node_off, "local-mac-address", 404 padded_mac, sizeof(padded_mac)); 405 } 406 if (ret < 0) { 407 return ret; 408 } 409 410 ret = fdt_setprop_cell(fdt, node_off, "ibm,mac-address-filters", 0); 411 if (ret < 0) { 412 return ret; 413 } 414 415 return 0; 416 } 417 418 static int check_bd(VIOsPAPRVLANDevice *dev, vlan_bd_t bd, 419 target_ulong alignment) 420 { 421 if ((VLAN_BD_ADDR(bd) % alignment) 422 || (VLAN_BD_LEN(bd) % alignment)) { 423 return -1; 424 } 425 426 if (!spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd), 427 VLAN_BD_LEN(bd), DMA_DIRECTION_FROM_DEVICE) 428 || !spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd), 429 VLAN_BD_LEN(bd), DMA_DIRECTION_TO_DEVICE)) { 430 return -1; 431 } 432 433 return 0; 434 } 435 436 static target_ulong h_register_logical_lan(PowerPCCPU *cpu, 437 sPAPRMachineState *spapr, 438 target_ulong opcode, 439 target_ulong *args) 440 { 441 target_ulong reg = args[0]; 442 target_ulong buf_list = args[1]; 443 target_ulong rec_queue = args[2]; 444 target_ulong filter_list = args[3]; 445 VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 446 VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev); 447 vlan_bd_t filter_list_bd; 448 449 if (!dev) { 450 return H_PARAMETER; 451 } 452 453 if (dev->isopen) { 454 hcall_dprintf("H_REGISTER_LOGICAL_LAN called twice without " 455 "H_FREE_LOGICAL_LAN\n"); 456 return H_RESOURCE; 457 } 458 459 if (check_bd(dev, VLAN_VALID_BD(buf_list, SPAPR_TCE_PAGE_SIZE), 460 SPAPR_TCE_PAGE_SIZE) < 0) { 461 hcall_dprintf("Bad buf_list 0x" TARGET_FMT_lx "\n", buf_list); 462 return H_PARAMETER; 463 } 464 465 filter_list_bd = VLAN_VALID_BD(filter_list, SPAPR_TCE_PAGE_SIZE); 466 if (check_bd(dev, filter_list_bd, SPAPR_TCE_PAGE_SIZE) < 0) { 467 hcall_dprintf("Bad filter_list 0x" TARGET_FMT_lx "\n", filter_list); 468 return H_PARAMETER; 469 } 470 471 if (!(rec_queue & VLAN_BD_VALID) 472 || (check_bd(dev, rec_queue, VLAN_RQ_ALIGNMENT) < 0)) { 473 hcall_dprintf("Bad receive queue\n"); 474 return H_PARAMETER; 475 } 476 477 dev->buf_list = buf_list; 478 sdev->signal_state = 0; 479 480 rec_queue &= ~VLAN_BD_TOGGLE; 481 482 /* Initialize the buffer list */ 483 vio_stq(sdev, buf_list, rec_queue); 484 vio_stq(sdev, buf_list + 8, filter_list_bd); 485 spapr_vio_dma_set(sdev, buf_list + VLAN_RX_BDS_OFF, 0, 486 SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF); 487 dev->add_buf_ptr = VLAN_RX_BDS_OFF - 8; 488 dev->use_buf_ptr = VLAN_RX_BDS_OFF - 8; 489 dev->rx_bufs = 0; 490 dev->rxq_ptr = 0; 491 492 /* Initialize the receive queue */ 493 spapr_vio_dma_set(sdev, VLAN_BD_ADDR(rec_queue), 0, VLAN_BD_LEN(rec_queue)); 494 495 dev->isopen = 1; 496 qemu_flush_queued_packets(qemu_get_queue(dev->nic)); 497 498 return H_SUCCESS; 499 } 500 501 502 static target_ulong h_free_logical_lan(PowerPCCPU *cpu, 503 sPAPRMachineState *spapr, 504 target_ulong opcode, target_ulong *args) 505 { 506 target_ulong reg = args[0]; 507 VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 508 VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev); 509 510 if (!dev) { 511 return H_PARAMETER; 512 } 513 514 if (!dev->isopen) { 515 hcall_dprintf("H_FREE_LOGICAL_LAN called without " 516 "H_REGISTER_LOGICAL_LAN\n"); 517 return H_RESOURCE; 518 } 519 520 spapr_vlan_reset(sdev); 521 return H_SUCCESS; 522 } 523 524 /** 525 * Used for qsort, this function compares two RxBufPools by size. 526 */ 527 static int rx_pool_size_compare(const void *p1, const void *p2) 528 { 529 const RxBufPool *pool1 = *(RxBufPool **)p1; 530 const RxBufPool *pool2 = *(RxBufPool **)p2; 531 532 if (pool1->bufsize < pool2->bufsize) { 533 return -1; 534 } 535 return pool1->bufsize > pool2->bufsize; 536 } 537 538 /** 539 * Search for a matching buffer pool with exact matching size, 540 * or return -1 if no matching pool has been found. 541 */ 542 static int spapr_vlan_get_rx_pool_id(VIOsPAPRVLANDevice *dev, int size) 543 { 544 int pool; 545 546 for (pool = 0; pool < RX_MAX_POOLS; pool++) { 547 if (dev->rx_pool[pool]->bufsize == size) { 548 return pool; 549 } 550 } 551 552 return -1; 553 } 554 555 /** 556 * Enqueuing receive buffer by adding it to one of our receive buffer pools 557 */ 558 static target_long spapr_vlan_add_rxbuf_to_pool(VIOsPAPRVLANDevice *dev, 559 target_ulong buf) 560 { 561 int size = VLAN_BD_LEN(buf); 562 int pool; 563 564 pool = spapr_vlan_get_rx_pool_id(dev, size); 565 if (pool < 0) { 566 /* 567 * No matching pool found? Try to use a new one. If the guest used all 568 * pools before, but changed the size of one pool in the meantime, we might 569 * need to recycle that pool here (if it's empty already). Thus scan 570 * all buffer pools now, starting with the last (likely empty) one. 571 */ 572 for (pool = RX_MAX_POOLS - 1; pool >= 0 ; pool--) { 573 if (dev->rx_pool[pool]->count == 0) { 574 dev->rx_pool[pool]->bufsize = size; 575 /* 576 * Sort pools by size so that spapr_vlan_receive() 577 * can later find the smallest buffer pool easily. 578 */ 579 qsort(dev->rx_pool, RX_MAX_POOLS, sizeof(dev->rx_pool[0]), 580 rx_pool_size_compare); 581 pool = spapr_vlan_get_rx_pool_id(dev, size); 582 trace_spapr_vlan_add_rxbuf_to_pool_create(pool, 583 VLAN_BD_LEN(buf)); 584 break; 585 } 586 } 587 } 588 /* Still no usable pool? Give up */ 589 if (pool < 0 || dev->rx_pool[pool]->count >= RX_POOL_MAX_BDS) { 590 return H_RESOURCE; 591 } 592 593 trace_spapr_vlan_add_rxbuf_to_pool(pool, VLAN_BD_LEN(buf), 594 dev->rx_pool[pool]->count); 595 596 dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count++] = buf; 597 598 return 0; 599 } 600 601 /** 602 * This is the old way of enqueuing receive buffers: Add it to the rx queue 603 * page that has been supplied by the guest (which is quite limited in size). 604 */ 605 static target_long spapr_vlan_add_rxbuf_to_page(VIOsPAPRVLANDevice *dev, 606 target_ulong buf) 607 { 608 vlan_bd_t bd; 609 610 if (dev->rx_bufs >= VLAN_MAX_BUFS) { 611 return H_RESOURCE; 612 } 613 614 do { 615 dev->add_buf_ptr += 8; 616 if (dev->add_buf_ptr >= VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF) { 617 dev->add_buf_ptr = VLAN_RX_BDS_OFF; 618 } 619 620 bd = vio_ldq(&dev->sdev, dev->buf_list + dev->add_buf_ptr); 621 } while (bd & VLAN_BD_VALID); 622 623 vio_stq(&dev->sdev, dev->buf_list + dev->add_buf_ptr, buf); 624 625 trace_spapr_vlan_add_rxbuf_to_page(dev->add_buf_ptr, dev->rx_bufs, buf); 626 627 return 0; 628 } 629 630 static target_ulong h_add_logical_lan_buffer(PowerPCCPU *cpu, 631 sPAPRMachineState *spapr, 632 target_ulong opcode, 633 target_ulong *args) 634 { 635 target_ulong reg = args[0]; 636 target_ulong buf = args[1]; 637 VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 638 VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev); 639 target_long ret; 640 641 trace_spapr_vlan_h_add_logical_lan_buffer(reg, buf); 642 643 if (!sdev) { 644 hcall_dprintf("Bad device\n"); 645 return H_PARAMETER; 646 } 647 648 if ((check_bd(dev, buf, 4) < 0) 649 || (VLAN_BD_LEN(buf) < 16)) { 650 hcall_dprintf("Bad buffer enqueued\n"); 651 return H_PARAMETER; 652 } 653 654 if (!dev->isopen) { 655 return H_RESOURCE; 656 } 657 658 if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) { 659 ret = spapr_vlan_add_rxbuf_to_pool(dev, buf); 660 } else { 661 ret = spapr_vlan_add_rxbuf_to_page(dev, buf); 662 } 663 if (ret) { 664 return ret; 665 } 666 667 dev->rx_bufs++; 668 669 /* 670 * Give guest some more time to add additional RX buffers before we 671 * flush the receive queue, so that e.g. fragmented IP packets can 672 * be passed to the guest in one go later (instead of passing single 673 * fragments if there is only one receive buffer available). 674 */ 675 timer_mod(dev->rxp_timer, qemu_clock_get_us(QEMU_CLOCK_VIRTUAL) + 500); 676 677 return H_SUCCESS; 678 } 679 680 static target_ulong h_send_logical_lan(PowerPCCPU *cpu, 681 sPAPRMachineState *spapr, 682 target_ulong opcode, target_ulong *args) 683 { 684 target_ulong reg = args[0]; 685 target_ulong *bufs = args + 1; 686 target_ulong continue_token = args[7]; 687 VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 688 VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev); 689 unsigned total_len; 690 uint8_t *lbuf, *p; 691 int i, nbufs; 692 int ret; 693 694 trace_spapr_vlan_h_send_logical_lan(reg, continue_token); 695 696 if (!sdev) { 697 return H_PARAMETER; 698 } 699 700 trace_spapr_vlan_h_send_logical_lan_rxbufs(dev->rx_bufs); 701 702 if (!dev->isopen) { 703 return H_DROPPED; 704 } 705 706 if (continue_token) { 707 return H_HARDWARE; /* FIXME actually handle this */ 708 } 709 710 total_len = 0; 711 for (i = 0; i < 6; i++) { 712 trace_spapr_vlan_h_send_logical_lan_buf_desc(bufs[i]); 713 if (!(bufs[i] & VLAN_BD_VALID)) { 714 break; 715 } 716 total_len += VLAN_BD_LEN(bufs[i]); 717 } 718 719 nbufs = i; 720 trace_spapr_vlan_h_send_logical_lan_total(nbufs, total_len); 721 722 if (total_len == 0) { 723 return H_SUCCESS; 724 } 725 726 if (total_len > MAX_PACKET_SIZE) { 727 /* Don't let the guest force too large an allocation */ 728 return H_RESOURCE; 729 } 730 731 lbuf = alloca(total_len); 732 p = lbuf; 733 for (i = 0; i < nbufs; i++) { 734 ret = spapr_vio_dma_read(sdev, VLAN_BD_ADDR(bufs[i]), 735 p, VLAN_BD_LEN(bufs[i])); 736 if (ret < 0) { 737 return ret; 738 } 739 740 p += VLAN_BD_LEN(bufs[i]); 741 } 742 743 qemu_send_packet(qemu_get_queue(dev->nic), lbuf, total_len); 744 745 return H_SUCCESS; 746 } 747 748 static target_ulong h_multicast_ctrl(PowerPCCPU *cpu, sPAPRMachineState *spapr, 749 target_ulong opcode, target_ulong *args) 750 { 751 target_ulong reg = args[0]; 752 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 753 754 if (!dev) { 755 return H_PARAMETER; 756 } 757 758 return H_SUCCESS; 759 } 760 761 static target_ulong h_change_logical_lan_mac(PowerPCCPU *cpu, 762 sPAPRMachineState *spapr, 763 target_ulong opcode, 764 target_ulong *args) 765 { 766 target_ulong reg = args[0]; 767 target_ulong macaddr = args[1]; 768 VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 769 VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev); 770 int i; 771 772 for (i = 0; i < ETH_ALEN; i++) { 773 dev->nicconf.macaddr.a[ETH_ALEN - i - 1] = macaddr & 0xff; 774 macaddr >>= 8; 775 } 776 777 qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a); 778 779 return H_SUCCESS; 780 } 781 782 static Property spapr_vlan_properties[] = { 783 DEFINE_SPAPR_PROPERTIES(VIOsPAPRVLANDevice, sdev), 784 DEFINE_NIC_PROPERTIES(VIOsPAPRVLANDevice, nicconf), 785 DEFINE_PROP_BIT("use-rx-buffer-pools", VIOsPAPRVLANDevice, 786 compat_flags, SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT, true), 787 DEFINE_PROP_END_OF_LIST(), 788 }; 789 790 static bool spapr_vlan_rx_buffer_pools_needed(void *opaque) 791 { 792 VIOsPAPRVLANDevice *dev = opaque; 793 794 return (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) != 0; 795 } 796 797 static const VMStateDescription vmstate_rx_buffer_pool = { 798 .name = "spapr_llan/rx_buffer_pool", 799 .version_id = 1, 800 .minimum_version_id = 1, 801 .needed = spapr_vlan_rx_buffer_pools_needed, 802 .fields = (VMStateField[]) { 803 VMSTATE_INT32(bufsize, RxBufPool), 804 VMSTATE_INT32(count, RxBufPool), 805 VMSTATE_UINT64_ARRAY(bds, RxBufPool, RX_POOL_MAX_BDS), 806 VMSTATE_END_OF_LIST() 807 } 808 }; 809 810 static const VMStateDescription vmstate_rx_pools = { 811 .name = "spapr_llan/rx_pools", 812 .version_id = 1, 813 .minimum_version_id = 1, 814 .needed = spapr_vlan_rx_buffer_pools_needed, 815 .fields = (VMStateField[]) { 816 VMSTATE_ARRAY_OF_POINTER_TO_STRUCT(rx_pool, VIOsPAPRVLANDevice, 817 RX_MAX_POOLS, 1, 818 vmstate_rx_buffer_pool, RxBufPool), 819 VMSTATE_END_OF_LIST() 820 } 821 }; 822 823 static const VMStateDescription vmstate_spapr_llan = { 824 .name = "spapr_llan", 825 .version_id = 1, 826 .minimum_version_id = 1, 827 .fields = (VMStateField[]) { 828 VMSTATE_SPAPR_VIO(sdev, VIOsPAPRVLANDevice), 829 /* LLAN state */ 830 VMSTATE_BOOL(isopen, VIOsPAPRVLANDevice), 831 VMSTATE_UINT64(buf_list, VIOsPAPRVLANDevice), 832 VMSTATE_UINT32(add_buf_ptr, VIOsPAPRVLANDevice), 833 VMSTATE_UINT32(use_buf_ptr, VIOsPAPRVLANDevice), 834 VMSTATE_UINT32(rx_bufs, VIOsPAPRVLANDevice), 835 VMSTATE_UINT64(rxq_ptr, VIOsPAPRVLANDevice), 836 837 VMSTATE_END_OF_LIST() 838 }, 839 .subsections = (const VMStateDescription * []) { 840 &vmstate_rx_pools, 841 NULL 842 } 843 }; 844 845 static void spapr_vlan_class_init(ObjectClass *klass, void *data) 846 { 847 DeviceClass *dc = DEVICE_CLASS(klass); 848 VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass); 849 850 k->realize = spapr_vlan_realize; 851 k->reset = spapr_vlan_reset; 852 k->devnode = spapr_vlan_devnode; 853 k->dt_name = "l-lan"; 854 k->dt_type = "network"; 855 k->dt_compatible = "IBM,l-lan"; 856 k->signal_mask = 0x1; 857 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 858 dc->props = spapr_vlan_properties; 859 k->rtce_window_size = 0x10000000; 860 dc->vmsd = &vmstate_spapr_llan; 861 } 862 863 static const TypeInfo spapr_vlan_info = { 864 .name = TYPE_VIO_SPAPR_VLAN_DEVICE, 865 .parent = TYPE_VIO_SPAPR_DEVICE, 866 .instance_size = sizeof(VIOsPAPRVLANDevice), 867 .class_init = spapr_vlan_class_init, 868 .instance_init = spapr_vlan_instance_init, 869 .instance_finalize = spapr_vlan_instance_finalize, 870 }; 871 872 static void spapr_vlan_register_types(void) 873 { 874 spapr_register_hypercall(H_REGISTER_LOGICAL_LAN, h_register_logical_lan); 875 spapr_register_hypercall(H_FREE_LOGICAL_LAN, h_free_logical_lan); 876 spapr_register_hypercall(H_SEND_LOGICAL_LAN, h_send_logical_lan); 877 spapr_register_hypercall(H_ADD_LOGICAL_LAN_BUFFER, 878 h_add_logical_lan_buffer); 879 spapr_register_hypercall(H_MULTICAST_CTRL, h_multicast_ctrl); 880 spapr_register_hypercall(H_CHANGE_LOGICAL_LAN_MAC, 881 h_change_logical_lan_mac); 882 type_register_static(&spapr_vlan_info); 883 } 884 885 type_init(spapr_vlan_register_types) 886