Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netatm/atm_device.c
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1 /* 2 * 3 * =================================== 4 * HARP | Host ATM Research Platform 5 * =================================== 6 * 7 * 8 * This Host ATM Research Platform ("HARP") file (the "Software") is 9 * made available by Network Computing Services, Inc. ("NetworkCS") 10 * "AS IS". NetworkCS does not provide maintenance, improvements or 11 * support of any kind. 12 * 13 * NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED, 14 * INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY 15 * AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE 16 * SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE. 17 * In no event shall NetworkCS be responsible for any damages, including 18 * but not limited to consequential damages, arising from or relating to 19 * any use of the Software or related support. 20 * 21 * Copyright 1994-1998 Network Computing Services, Inc. 22 * 23 * Copies of this Software may be made, however, the above copyright 24 * notice must be reproduced on all copies. 25 * 26 * @(#) $FreeBSD: releng/5.0/sys/netatm/atm_device.c 106651 2002-11-08 18:27:30Z jhb $ 27 * 28 */ 29 30 /* 31 * Core ATM Services 32 * ----------------- 33 * 34 * ATM device support functions 35 * 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/errno.h> 41 #include <sys/malloc.h> 42 #include <sys/time.h> 43 #include <sys/socket.h> 44 #include <sys/socketvar.h> 45 #include <sys/syslog.h> 46 #include <net/if.h> 47 #include <netatm/port.h> 48 #include <netatm/queue.h> 49 #include <netatm/atm.h> 50 #include <netatm/atm_sys.h> 51 #include <netatm/atm_sap.h> 52 #include <netatm/atm_cm.h> 53 #include <netatm/atm_if.h> 54 #include <netatm/atm_vc.h> 55 #include <netatm/atm_stack.h> 56 #include <netatm/atm_pcb.h> 57 #include <netatm/atm_var.h> 58 59 #ifndef lint 60 __RCSID("@(#) $FreeBSD: releng/5.0/sys/netatm/atm_device.c 106651 2002-11-08 18:27:30Z jhb $"); 61 #endif 62 63 64 /* 65 * Private structures for managing allocated kernel memory resources 66 * 67 * For each allocation of kernel memory, one Mem_ent will be used. 68 * The Mem_ent structures will be allocated in blocks inside of a 69 * Mem_blk structure. 70 */ 71 #define MEM_NMEMENT 10 /* How many Mem_ent's in a Mem_blk */ 72 73 struct mem_ent { 74 void *me_kaddr; /* Allocated memory address */ 75 u_int me_ksize; /* Allocated memory length */ 76 void *me_uaddr; /* Memory address returned to caller */ 77 u_int me_flags; /* Flags (see below) */ 78 }; 79 typedef struct mem_ent Mem_ent; 80 81 /* 82 * Memory entry flags 83 */ 84 #define MEF_NONCACHE 1 /* Memory is noncacheable */ 85 86 87 struct mem_blk { 88 struct mem_blk *mb_next; /* Next block in chain */ 89 Mem_ent mb_mement[MEM_NMEMENT]; /* Allocated memory entries */ 90 }; 91 typedef struct mem_blk Mem_blk; 92 93 static Mem_blk *atm_mem_head = NULL; 94 95 static struct t_atm_cause atm_dev_cause = { 96 T_ATM_ITU_CODING, 97 T_ATM_LOC_USER, 98 T_ATM_CAUSE_VPCI_VCI_ASSIGNMENT_FAILURE, 99 {0, 0, 0, 0} 100 }; 101 102 103 /* 104 * ATM Device Stack Instantiation 105 * 106 * Called at splnet. 107 * 108 * Arguments 109 * ssp pointer to array of stack definition pointers 110 * for connection 111 * ssp[0] points to upper layer's stack definition 112 * ssp[1] points to this layer's stack definition 113 * ssp[2] points to lower layer's stack definition 114 * cvcp pointer to connection vcc for this stack 115 * 116 * Returns 117 * 0 instantiation successful 118 * err instantiation failed - reason indicated 119 * 120 */ 121 int 122 atm_dev_inst(ssp, cvcp) 123 struct stack_defn **ssp; 124 Atm_connvc *cvcp; 125 { 126 Cmn_unit *cup = (Cmn_unit *)cvcp->cvc_attr.nif->nif_pif; 127 Cmn_vcc *cvp; 128 int err; 129 130 /* 131 * Check to see if device has been initialized 132 */ 133 if ((cup->cu_flags & CUF_INITED) == 0) 134 return ( EIO ); 135 136 /* 137 * Validate lower SAP 138 */ 139 /* 140 * Device driver is the lowest layer - no need to validate 141 */ 142 143 /* 144 * Validate PVC vpi.vci 145 */ 146 if (cvcp->cvc_attr.called.addr.address_format == T_ATM_PVC_ADDR) { 147 /* 148 * Look through existing circuits - return error if found 149 */ 150 Atm_addr_pvc *pp; 151 152 pp = (Atm_addr_pvc *)cvcp->cvc_attr.called.addr.address; 153 if (atm_dev_vcc_find(cup, ATM_PVC_GET_VPI(pp), 154 ATM_PVC_GET_VCI(pp), 0)) 155 return ( EADDRINUSE ); 156 } 157 158 /* 159 * Validate our SAP type 160 */ 161 switch ((*(ssp+1))->sd_sap) { 162 case SAP_CPCS_AAL3_4: 163 case SAP_CPCS_AAL5: 164 case SAP_ATM: 165 break; 166 default: 167 return (EINVAL); 168 } 169 170 /* 171 * Allocate a VCC control block 172 */ 173 cvp = uma_zalloc(cup->cu_vcc_zone, M_WAITOK); 174 if (cvp == NULL) 175 return (ENOMEM); 176 177 cvp->cv_state = CVS_INST; 178 cvp->cv_toku = (*ssp)->sd_toku; 179 cvp->cv_upper = (*ssp)->sd_upper; 180 cvp->cv_connvc = cvcp; 181 182 /* 183 * Let device have a look at the connection request 184 */ 185 err = (*cup->cu_instvcc)(cup, cvp); 186 if (err) { 187 uma_zfree(cup->cu_vcc_zone, cvp); 188 return (err); 189 } 190 191 /* 192 * Looks good so far, so link in device VCC 193 */ 194 LINK2TAIL ( cvp, Cmn_vcc, cup->cu_vcc, cv_next ); 195 196 /* 197 * Save my token 198 */ 199 (*++ssp)->sd_toku = cvp; 200 201 /* 202 * Pass instantiation down the stack 203 */ 204 /* 205 * No need - we're the lowest point. 206 */ 207 /* err = (*(ssp + 1))->sd_inst(ssp, cvcp); */ 208 209 /* 210 * Save the lower layer's interface info 211 */ 212 /* 213 * No need - we're the lowest point 214 */ 215 /* cvp->cv_lower = (*++ssp)->sd_lower; */ 216 /* cvp->cv_tok1 = (*ssp)->sd_toku; */ 217 218 return (0); 219 } 220 221 222 /* 223 * ATM Device Stack Command Handler 224 * 225 * Arguments 226 * cmd stack command code 227 * tok session token (Cmn_vcc) 228 * arg1 command specific argument 229 * arg2 command specific argument 230 * 231 * Returns 232 * none 233 * 234 */ 235 /*ARGSUSED*/ 236 void 237 atm_dev_lower(cmd, tok, arg1, arg2) 238 int cmd; 239 void *tok; 240 intptr_t arg1; 241 intptr_t arg2; 242 { 243 Cmn_vcc *cvp = (Cmn_vcc *)tok; 244 Atm_connvc *cvcp = cvp->cv_connvc; 245 Cmn_unit *cup = (Cmn_unit *)cvcp->cvc_attr.nif->nif_pif; 246 struct vccb *vcp; 247 u_int state; 248 int s; 249 250 switch ( cmd ) { 251 252 case CPCS_INIT: 253 /* 254 * Sanity check 255 */ 256 if ( cvp->cv_state != CVS_INST ) { 257 log ( LOG_ERR, 258 "atm_dev_lower: INIT: tok=%p, state=%d\n", 259 tok, cvp->cv_state ); 260 break; 261 } 262 263 vcp = cvp->cv_connvc->cvc_vcc; 264 265 /* 266 * Validate SVC vpi.vci 267 */ 268 if ( vcp->vc_type & VCC_SVC ) { 269 270 if (atm_dev_vcc_find(cup, vcp->vc_vpi, vcp->vc_vci, 271 vcp->vc_type & (VCC_IN | VCC_OUT)) 272 != cvp){ 273 log ( LOG_ERR, 274 "atm_dev_lower: dup SVC (%d,%d) tok=%p\n", 275 vcp->vc_vpi, vcp->vc_vci, tok ); 276 atm_cm_abort(cvp->cv_connvc, &atm_dev_cause); 277 break; 278 } 279 } 280 281 /* 282 * Tell the device to open the VCC 283 */ 284 cvp->cv_state = CVS_INITED; 285 s = splimp(); 286 if ((*cup->cu_openvcc)(cup, cvp)) { 287 atm_cm_abort(cvp->cv_connvc, &atm_dev_cause); 288 (void) splx(s); 289 break; 290 } 291 (void) splx(s); 292 break; 293 294 case CPCS_TERM: { 295 KBuffer *m, *prev, *next; 296 int *ip; 297 298 s = splimp(); 299 300 /* 301 * Disconnect the VCC - ignore return code 302 */ 303 if ((cvp->cv_state == CVS_INITED) || 304 (cvp->cv_state == CVS_ACTIVE)) { 305 (void) (*cup->cu_closevcc)(cup, cvp); 306 } 307 cvp->cv_state = CVS_TERM; 308 309 /* 310 * Remove from interface list 311 */ 312 UNLINK ( cvp, Cmn_vcc, cup->cu_vcc, cv_next ); 313 314 /* 315 * Free any buffers from this VCC on the ATM interrupt queue 316 */ 317 prev = NULL; 318 IF_LOCK(&atm_intrq); 319 for (m = atm_intrq.ifq_head; m; m = next) { 320 next = KB_QNEXT(m); 321 322 /* 323 * See if this entry is for the terminating VCC 324 */ 325 KB_DATASTART(m, ip, int *); 326 ip++; 327 if (*ip == (intptr_t)cvp) { 328 /* 329 * Yep, so dequeue the entry 330 */ 331 if (prev == NULL) 332 atm_intrq.ifq_head = next; 333 else 334 KB_QNEXT(prev) = next; 335 336 if (next == NULL) 337 atm_intrq.ifq_tail = prev; 338 339 atm_intrq.ifq_len--; 340 341 /* 342 * Free the unwanted buffers 343 */ 344 KB_FREEALL(m); 345 } else { 346 prev = m; 347 } 348 } 349 IF_UNLOCK(&atm_intrq); 350 (void) splx(s); 351 352 /* 353 * Free VCC resources 354 */ 355 uma_zfree(cup->cu_vcc_zone, cvp); 356 break; 357 } 358 359 case CPCS_UNITDATA_INV: 360 361 /* 362 * Sanity check 363 * 364 * Use temp state variable since we dont want to lock out 365 * interrupts, but initial VC activation interrupt may 366 * happen here, changing state somewhere in the middle. 367 */ 368 state = cvp->cv_state; 369 if ((state != CVS_ACTIVE) && 370 (state != CVS_INITED)) { 371 log ( LOG_ERR, 372 "atm_dev_lower: UNITDATA: tok=%p, state=%d\n", 373 tok, state ); 374 KB_FREEALL((KBuffer *)arg1); 375 break; 376 } 377 378 /* 379 * Hand the data off to the device 380 */ 381 (*cup->cu_output)(cup, cvp, (KBuffer *)arg1); 382 383 break; 384 385 case CPCS_UABORT_INV: 386 log ( LOG_ERR, 387 "atm_dev_lower: unimplemented stack cmd 0x%x, tok=%p\n", 388 cmd, tok ); 389 break; 390 391 default: 392 log ( LOG_ERR, 393 "atm_dev_lower: unknown stack cmd 0x%x, tok=%p\n", 394 cmd, tok ); 395 396 } 397 398 return; 399 } 400 401 402 403 /* 404 * Allocate kernel memory block 405 * 406 * This function will allocate a kernel memory block of the type specified 407 * in the flags parameter. The returned address will point to a memory 408 * block of the requested size and alignment. The memory block will also 409 * be zeroed. The alloc/free functions will manage/mask both the OS-specific 410 * kernel memory management requirements and the bookkeeping required to 411 * deal with data alignment issues. 412 * 413 * This function should not be called from interrupt level. 414 * 415 * Arguments: 416 * size size of memory block to allocate 417 * align data alignment requirement 418 * flags allocation flags (ATM_DEV_*) 419 * 420 * Returns: 421 * uaddr pointer to aligned memory block 422 * NULL unable to allocate memory 423 * 424 */ 425 void * 426 atm_dev_alloc(size, align, flags) 427 u_int size; 428 u_int align; 429 u_int flags; 430 { 431 Mem_blk *mbp; 432 Mem_ent *mep; 433 u_int kalign, ksize; 434 int s, i; 435 436 s = splimp(); 437 438 /* 439 * Find a free Mem_ent 440 */ 441 mep = NULL; 442 for (mbp = atm_mem_head; mbp && mep == NULL; mbp = mbp->mb_next) { 443 for (i = 0; i < MEM_NMEMENT; i++) { 444 if (mbp->mb_mement[i].me_uaddr == NULL) { 445 mep = &mbp->mb_mement[i]; 446 break; 447 } 448 } 449 } 450 451 /* 452 * If there are no free Mem_ent's, then allocate a new Mem_blk 453 * and link it into the chain 454 */ 455 if (mep == NULL) { 456 mbp = malloc(sizeof(Mem_blk), M_DEVBUF, M_NOWAIT|M_ZERO); 457 if (mbp == NULL) { 458 log(LOG_ERR, "atm_dev_alloc: Mem_blk failure\n"); 459 (void) splx(s); 460 return (NULL); 461 } 462 mbp->mb_next = atm_mem_head; 463 atm_mem_head = mbp; 464 mep = mbp->mb_mement; 465 } 466 467 /* 468 * Now we need to get the kernel's allocation alignment minimum 469 * 470 * This is obviously very OS-specific stuff 471 */ 472 kalign = MINALLOCSIZE; 473 474 /* 475 * Figure out how much memory we must allocate to satify the 476 * user's size and alignment needs 477 */ 478 if (align <= kalign) 479 ksize = size; 480 else 481 ksize = size + align - kalign; 482 483 /* 484 * Finally, go get the memory 485 */ 486 if (flags & ATM_DEV_NONCACHE) { 487 mep->me_kaddr = malloc(ksize, M_DEVBUF, M_NOWAIT); 488 } else { 489 mep->me_kaddr = malloc(ksize, M_DEVBUF, M_NOWAIT); 490 } 491 492 if (mep->me_kaddr == NULL) { 493 log(LOG_ERR, "atm_dev_alloc: %skernel memory unavailable\n", 494 (flags & ATM_DEV_NONCACHE) ? "non-cacheable " : ""); 495 (void) splx(s); 496 return (NULL); 497 } 498 499 /* 500 * Calculate correct alignment address to pass back to user 501 */ 502 mep->me_uaddr = (void *) roundup((uintptr_t)mep->me_kaddr, align); 503 mep->me_ksize = ksize; 504 mep->me_flags = flags; 505 506 /* 507 * Clear memory for user 508 */ 509 bzero(mep->me_uaddr, size); 510 511 ATM_DEBUG4("atm_dev_alloc: size=%d, align=%d, flags=%d, uaddr=%p\n", 512 size, align, flags, mep->me_uaddr); 513 514 (void) splx(s); 515 516 return (mep->me_uaddr); 517 } 518 519 520 /* 521 * Free kernel memory block 522 * 523 * This function will free a kernel memory block previously allocated by 524 * the atm_dev_alloc function. 525 * 526 * This function should not be called from interrupt level. 527 * 528 * Arguments: 529 * uaddr pointer to allocated aligned memory block 530 * 531 * Returns: 532 * none 533 * 534 */ 535 void 536 atm_dev_free(uaddr) 537 volatile void *uaddr; 538 { 539 Mem_blk *mbp; 540 Mem_ent *mep; 541 int s, i; 542 543 ATM_DEBUG1("atm_dev_free: uaddr=%p\n", uaddr); 544 545 s = splimp(); 546 547 /* 548 * Protect ourselves... 549 */ 550 if (uaddr == NULL) 551 panic("atm_dev_free: trying to free null address"); 552 553 /* 554 * Find our associated entry 555 */ 556 mep = NULL; 557 for (mbp = atm_mem_head; mbp && mep == NULL; mbp = mbp->mb_next) { 558 for (i = 0; i < MEM_NMEMENT; i++) { 559 if (mbp->mb_mement[i].me_uaddr == uaddr) { 560 mep = &mbp->mb_mement[i]; 561 break; 562 } 563 } 564 } 565 566 /* 567 * If we didn't find our entry, then unceremoniously let the caller 568 * know they screwed up (it certainly couldn't be a bug here...) 569 */ 570 if (mep == NULL) 571 panic("atm_dev_free: trying to free unknown address"); 572 573 /* 574 * Give the memory space back to the kernel 575 */ 576 if (mep->me_flags & ATM_DEV_NONCACHE) { 577 free(mep->me_kaddr, M_DEVBUF); 578 } else { 579 free(mep->me_kaddr, M_DEVBUF); 580 } 581 582 /* 583 * Free our entry 584 */ 585 mep->me_uaddr = NULL; 586 587 (void) splx(s); 588 589 return; 590 } 591 592 /* 593 * Compress buffer chain 594 * 595 * This function will compress a supplied buffer chain into a minimum number 596 * of kernel buffers. Typically, this function will be used because the 597 * number of buffers in an output buffer chain is too large for a device's 598 * DMA capabilities. This should only be called as a last resort, since 599 * all the data copying will surely kill any hopes of decent performance. 600 * 601 * Arguments: 602 * m pointer to source buffer chain 603 * 604 * Returns: 605 * n pointer to compressed buffer chain 606 * 607 */ 608 KBuffer * 609 atm_dev_compress(m) 610 KBuffer *m; 611 { 612 KBuffer *n, *n0, **np; 613 int len, space; 614 caddr_t src, dst; 615 616 n = n0 = NULL; 617 np = &n0; 618 dst = NULL; 619 space = 0; 620 621 /* 622 * Copy each source buffer into compressed chain 623 */ 624 while (m) { 625 626 if (space == 0) { 627 628 /* 629 * Allocate another buffer for compressed chain 630 */ 631 KB_ALLOCEXT(n, ATM_DEV_CMPR_LG, KB_F_NOWAIT, KB_T_DATA); 632 if (n) { 633 space = ATM_DEV_CMPR_LG; 634 } else { 635 KB_ALLOC(n, ATM_DEV_CMPR_SM, KB_F_NOWAIT, 636 KB_T_DATA); 637 if (n) { 638 space = ATM_DEV_CMPR_SM; 639 } else { 640 /* 641 * Unable to get any new buffers, so 642 * just return the partially compressed 643 * chain and hope... 644 */ 645 *np = m; 646 break; 647 } 648 } 649 650 KB_HEADSET(n, 0); 651 KB_LEN(n) = 0; 652 KB_BFRSTART(n, dst, caddr_t); 653 654 *np = n; 655 np = &KB_NEXT(n); 656 } 657 658 /* 659 * Copy what we can from source buffer 660 */ 661 len = MIN(space, KB_LEN(m)); 662 KB_DATASTART(m, src, caddr_t); 663 bcopy(src, dst, len); 664 665 /* 666 * Adjust for copied data 667 */ 668 dst += len; 669 space -= len; 670 671 KB_HEADADJ(m, -len); 672 KB_TAILADJ(n, len); 673 674 /* 675 * If we've exhausted our current source buffer, free it 676 * and move to the next one 677 */ 678 if (KB_LEN(m) == 0) { 679 KB_FREEONE(m, m); 680 } 681 } 682 683 return (n0); 684 } 685 686 687 /* 688 * Locate VCC entry 689 * 690 * This function will return the VCC entry for a specified interface and 691 * VPI/VCI value. 692 * 693 * Arguments: 694 * cup pointer to interface unit structure 695 * vpi VPI value 696 * vci VCI value 697 * type VCC type 698 * 699 * Returns: 700 * vcp pointer to located VCC entry matching 701 * NULL no VCC found 702 * 703 */ 704 Cmn_vcc * 705 atm_dev_vcc_find(cup, vpi, vci, type) 706 Cmn_unit *cup; 707 u_int vpi; 708 u_int vci; 709 u_int type; 710 { 711 Cmn_vcc *cvp; 712 int s = splnet(); 713 714 /* 715 * Go find VCC 716 * 717 * (Probably should stick in a hash table some time) 718 */ 719 for (cvp = cup->cu_vcc; cvp; cvp = cvp->cv_next) { 720 struct vccb *vcp; 721 722 vcp = cvp->cv_connvc->cvc_vcc; 723 if ((vcp->vc_vci == vci) && (vcp->vc_vpi == vpi) && 724 ((vcp->vc_type & type) == type)) 725 break; 726 } 727 728 (void) splx(s); 729 return (cvp); 730 } 731 732 733 #ifdef notdef 734 /* 735 * Module unloading notification 736 * 737 * This function must be called just prior to unloading the module from 738 * memory. All allocated memory will be freed here and anything else that 739 * needs cleaning up. 740 * 741 * Arguments: 742 * none 743 * 744 * Returns: 745 * none 746 * 747 */ 748 void 749 atm_unload() 750 { 751 Mem_blk *mbp; 752 Mem_ent *mep; 753 int s, i; 754 755 s = splimp(); 756 757 /* 758 * Free up all of our memory management storage 759 */ 760 while (mbp = atm_mem_head) { 761 762 /* 763 * Make sure users have freed up all of their memory 764 */ 765 for (i = 0; i < MEM_NMEMENT; i++) { 766 if (mbp->mb_mement[i].me_uaddr != NULL) { 767 panic("atm_unload: unfreed memory"); 768 } 769 } 770 771 atm_mem_head = mbp->mb_next; 772 773 /* 774 * Hand this block back to the kernel 775 */ 776 free((caddr_t)mbp, M_DEVBUF); 777 } 778 779 (void) splx(s); 780 781 return; 782 } 783 #endif /* notdef */ 784 785 786 /* 787 * Print a PDU 788 * 789 * Arguments: 790 * cup pointer to device unit 791 * cvp pointer to VCC control block 792 * m pointer to pdu buffer chain 793 * msg pointer to message string 794 * 795 * Returns: 796 * none 797 * 798 */ 799 void 800 atm_dev_pdu_print(cup, cvp, m, msg) 801 Cmn_unit *cup; 802 Cmn_vcc *cvp; 803 KBuffer *m; 804 char *msg; 805 { 806 char buf[128]; 807 808 snprintf(buf, sizeof(buf), "%s vcc=(%d,%d)", msg, 809 cvp->cv_connvc->cvc_vcc->vc_vpi, 810 cvp->cv_connvc->cvc_vcc->vc_vci); 811 812 atm_pdu_print(m, buf); 813 } 814
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