1 /* $KAME: altq_subr.c,v 1.23 2004/04/20 16:10:06 itojun Exp $ */ 2 /* $DragonFly: src/sys/net/altq/altq_subr.c,v 1.12 2008/05/14 11:59:23 sephe Exp $ */ 3 4 /* 5 * Copyright (C) 1997-2003 6 * Sony Computer Science Laboratories Inc. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include "opt_altq.h" 31 #include "opt_inet.h" 32 #include "opt_inet6.h" 33 34 #include <sys/param.h> 35 #include <sys/malloc.h> 36 #include <sys/mbuf.h> 37 #include <sys/systm.h> 38 #include <sys/proc.h> 39 #include <sys/socket.h> 40 #include <sys/socketvar.h> 41 #include <sys/kernel.h> 42 #include <sys/callout.h> 43 #include <sys/errno.h> 44 #include <sys/syslog.h> 45 #include <sys/sysctl.h> 46 #include <sys/queue.h> 47 #include <sys/thread2.h> 48 49 #include <net/if.h> 50 #include <net/if_dl.h> 51 #include <net/if_types.h> 52 #include <net/ifq_var.h> 53 54 #include <netinet/in.h> 55 #include <netinet/in_systm.h> 56 #include <netinet/ip.h> 57 #ifdef INET6 58 #include <netinet/ip6.h> 59 #endif 60 #include <netinet/tcp.h> 61 #include <netinet/udp.h> 62 63 #include <net/pf/pfvar.h> 64 #include <net/altq/altq.h> 65 66 /* machine dependent clock related includes */ 67 #include <machine/clock.h> /* for tsc_frequency */ 68 #include <machine/md_var.h> /* for cpu_feature */ 69 #include <machine/specialreg.h> /* for CPUID_TSC */ 70 71 /* 72 * internal function prototypes 73 */ 74 static void tbr_timeout(void *); 75 static int altq_enable_locked(struct ifaltq *); 76 static int altq_disable_locked(struct ifaltq *); 77 static int altq_detach_locked(struct ifaltq *); 78 static int tbr_set_locked(struct ifaltq *, struct tb_profile *); 79 80 int (*altq_input)(struct mbuf *, int) = NULL; 81 static int tbr_timer = 0; /* token bucket regulator timer */ 82 static struct callout tbr_callout; 83 84 int pfaltq_running; /* keep track of running state */ 85 86 MALLOC_DEFINE(M_ALTQ, "altq", "ALTQ structures"); 87 88 /* 89 * alternate queueing support routines 90 */ 91 92 /* look up the queue state by the interface name and the queueing type. */ 93 void * 94 altq_lookup(const char *name, int type) 95 { 96 struct ifnet *ifp; 97 98 if ((ifp = ifunit(name)) != NULL) { 99 if (type != ALTQT_NONE && ifp->if_snd.altq_type == type) 100 return (ifp->if_snd.altq_disc); 101 } 102 103 return (NULL); 104 } 105 106 int 107 altq_attach(struct ifaltq *ifq, int type, void *discipline, 108 altq_mapsubq_t mapsubq, 109 ifsq_enqueue_t enqueue, ifsq_dequeue_t dequeue, ifsq_request_t request, 110 void *clfier, 111 void *(*classify)(struct ifaltq *, struct mbuf *, struct altq_pktattr *)) 112 { 113 if (!ifq_is_ready(ifq)) 114 return ENXIO; 115 116 ifq->altq_type = type; 117 ifq->altq_disc = discipline; 118 ifq->altq_clfier = clfier; 119 ifq->altq_classify = classify; 120 ifq->altq_flags &= (ALTQF_CANTCHANGE|ALTQF_ENABLED); 121 ifq_set_methods(ifq, mapsubq, enqueue, dequeue, request); 122 return 0; 123 } 124 125 static int 126 altq_detach_locked(struct ifaltq *ifq) 127 { 128 if (!ifq_is_ready(ifq)) 129 return ENXIO; 130 if (ifq_is_enabled(ifq)) 131 return EBUSY; 132 if (!ifq_is_attached(ifq)) 133 return (0); 134 135 ifq_set_classic(ifq); 136 ifq->altq_type = ALTQT_NONE; 137 ifq->altq_disc = NULL; 138 ifq->altq_clfier = NULL; 139 ifq->altq_classify = NULL; 140 ifq->altq_flags &= ALTQF_CANTCHANGE; 141 return 0; 142 } 143 144 int 145 altq_detach(struct ifaltq *ifq) 146 { 147 int error; 148 149 ifq_lock_all(ifq); 150 error = altq_detach_locked(ifq); 151 ifq_unlock_all(ifq); 152 return error; 153 } 154 155 static int 156 altq_enable_locked(struct ifaltq *ifq) 157 { 158 if (!ifq_is_ready(ifq)) 159 return ENXIO; 160 if (ifq_is_enabled(ifq)) 161 return 0; 162 163 ifq_purge_all_locked(ifq); 164 165 ifq->altq_flags |= ALTQF_ENABLED; 166 if (ifq->altq_clfier != NULL) 167 ifq->altq_flags |= ALTQF_CLASSIFY; 168 return 0; 169 } 170 171 int 172 altq_enable(struct ifaltq *ifq) 173 { 174 int error; 175 176 ifq_lock_all(ifq); 177 error = altq_enable_locked(ifq); 178 ifq_unlock_all(ifq); 179 return error; 180 } 181 182 static int 183 altq_disable_locked(struct ifaltq *ifq) 184 { 185 if (!ifq_is_enabled(ifq)) 186 return 0; 187 188 ifq_purge_all_locked(ifq); 189 ifq->altq_flags &= ~(ALTQF_ENABLED|ALTQF_CLASSIFY); 190 return 0; 191 } 192 193 int 194 altq_disable(struct ifaltq *ifq) 195 { 196 int error; 197 198 ifq_lock_all(ifq); 199 error = altq_disable_locked(ifq); 200 ifq_unlock_all(ifq); 201 return error; 202 } 203 204 /* 205 * internal representation of token bucket parameters 206 * rate: byte_per_unittime << 32 207 * (((bits_per_sec) / 8) << 32) / machclk_freq 208 * depth: byte << 32 209 * 210 */ 211 #define TBR_SHIFT 32 212 #define TBR_SCALE(x) ((int64_t)(x) << TBR_SHIFT) 213 #define TBR_UNSCALE(x) ((x) >> TBR_SHIFT) 214 215 struct mbuf * 216 tbr_dequeue(struct ifaltq_subque *ifsq, int op) 217 { 218 struct ifaltq *ifq = ifsq->ifsq_altq; 219 struct tb_regulator *tbr; 220 struct mbuf *m; 221 int64_t interval; 222 uint64_t now; 223 224 if (ifsq_get_index(ifsq) != ALTQ_SUBQ_INDEX_DEFAULT) { 225 /* 226 * Race happened, the unrelated subqueue was 227 * picked during the packet scheduler transition. 228 */ 229 ifsq_classic_request(ifsq, ALTRQ_PURGE, NULL); 230 return NULL; 231 } 232 233 crit_enter(); 234 tbr = ifq->altq_tbr; 235 if (op == ALTDQ_REMOVE && tbr->tbr_lastop == ALTDQ_POLL) { 236 /* if this is a remove after poll, bypass tbr check */ 237 } else { 238 /* update token only when it is negative */ 239 if (tbr->tbr_token <= 0) { 240 now = read_machclk(); 241 interval = now - tbr->tbr_last; 242 if (interval >= tbr->tbr_filluptime) 243 tbr->tbr_token = tbr->tbr_depth; 244 else { 245 tbr->tbr_token += interval * tbr->tbr_rate; 246 if (tbr->tbr_token > tbr->tbr_depth) 247 tbr->tbr_token = tbr->tbr_depth; 248 } 249 tbr->tbr_last = now; 250 } 251 /* if token is still negative, don't allow dequeue */ 252 if (tbr->tbr_token <= 0) { 253 crit_exit(); 254 return (NULL); 255 } 256 } 257 258 if (ifq_is_enabled(ifq)) 259 m = (*ifsq->ifsq_dequeue)(ifsq, op); 260 else 261 m = ifsq_classic_dequeue(ifsq, op); 262 263 if (m != NULL && op == ALTDQ_REMOVE) 264 tbr->tbr_token -= TBR_SCALE(m_pktlen(m)); 265 tbr->tbr_lastop = op; 266 crit_exit(); 267 return (m); 268 } 269 270 /* 271 * set a token bucket regulator. 272 * if the specified rate is zero, the token bucket regulator is deleted. 273 */ 274 static int 275 tbr_set_locked(struct ifaltq *ifq, struct tb_profile *profile) 276 { 277 struct tb_regulator *tbr, *otbr; 278 279 if (machclk_freq == 0) 280 init_machclk(); 281 if (machclk_freq == 0) { 282 kprintf("%s: no cpu clock available!\n", __func__); 283 return (ENXIO); 284 } 285 286 if (profile->rate == 0) { 287 /* delete this tbr */ 288 if ((tbr = ifq->altq_tbr) == NULL) 289 return (ENOENT); 290 ifq->altq_tbr = NULL; 291 kfree(tbr, M_ALTQ); 292 return (0); 293 } 294 295 tbr = kmalloc(sizeof(*tbr), M_ALTQ, M_WAITOK | M_ZERO); 296 tbr->tbr_rate = TBR_SCALE(profile->rate / 8) / machclk_freq; 297 tbr->tbr_depth = TBR_SCALE(profile->depth); 298 if (tbr->tbr_rate > 0) 299 tbr->tbr_filluptime = tbr->tbr_depth / tbr->tbr_rate; 300 else 301 tbr->tbr_filluptime = 0xffffffffffffffffLL; 302 tbr->tbr_token = tbr->tbr_depth; 303 tbr->tbr_last = read_machclk(); 304 tbr->tbr_lastop = ALTDQ_REMOVE; 305 306 otbr = ifq->altq_tbr; 307 ifq->altq_tbr = tbr; /* set the new tbr */ 308 309 if (otbr != NULL) 310 kfree(otbr, M_ALTQ); 311 else if (tbr_timer == 0) { 312 callout_reset(&tbr_callout, 1, tbr_timeout, NULL); 313 tbr_timer = 1; 314 } 315 return (0); 316 } 317 318 int 319 tbr_set(struct ifaltq *ifq, struct tb_profile *profile) 320 { 321 int error; 322 323 ifq_lock_all(ifq); 324 error = tbr_set_locked(ifq, profile); 325 ifq_unlock_all(ifq); 326 return error; 327 } 328 329 /* 330 * tbr_timeout goes through the interface list, and kicks the drivers 331 * if necessary. 332 */ 333 static void 334 tbr_timeout(void *arg) 335 { 336 struct ifnet *ifp; 337 int active; 338 339 active = 0; 340 crit_enter(); 341 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 342 struct ifaltq_subque *ifsq; 343 344 if (ifp->if_snd.altq_tbr == NULL) 345 continue; 346 347 ifsq = &ifp->if_snd.altq_subq[ALTQ_SUBQ_INDEX_DEFAULT]; 348 active++; 349 if (!ifsq_is_empty(ifsq) && ifp->if_start != NULL) { 350 ifsq_serialize_hw(ifsq); 351 (*ifp->if_start)(ifp, ifsq); 352 ifsq_deserialize_hw(ifsq); 353 } 354 } 355 crit_exit(); 356 if (active > 0) 357 callout_reset(&tbr_callout, 1, tbr_timeout, NULL); 358 else 359 tbr_timer = 0; /* don't need tbr_timer anymore */ 360 } 361 362 /* 363 * get token bucket regulator profile 364 */ 365 int 366 tbr_get(struct ifaltq *ifq, struct tb_profile *profile) 367 { 368 struct tb_regulator *tbr; 369 370 if ((tbr = ifq->altq_tbr) == NULL) { 371 profile->rate = 0; 372 profile->depth = 0; 373 } else { 374 profile->rate = 375 (u_int)TBR_UNSCALE(tbr->tbr_rate * 8 * machclk_freq); 376 profile->depth = (u_int)TBR_UNSCALE(tbr->tbr_depth); 377 } 378 return (0); 379 } 380 381 /* 382 * attach a discipline to the interface. if one already exists, it is 383 * overridden. 384 */ 385 int 386 altq_pfattach(struct pf_altq *a) 387 { 388 struct ifaltq *ifq; 389 struct ifnet *ifp; 390 int error; 391 392 if (a->scheduler == ALTQT_NONE) 393 return 0; 394 395 if (a->altq_disc == NULL) 396 return EINVAL; 397 398 ifp = ifunit(a->ifname); 399 if (ifp == NULL) 400 return EINVAL; 401 ifq = &ifp->if_snd; 402 403 ifq_lock_all(ifq); 404 405 switch (a->scheduler) { 406 #ifdef ALTQ_CBQ 407 case ALTQT_CBQ: 408 error = cbq_pfattach(a, ifq); 409 break; 410 #endif 411 #ifdef ALTQ_PRIQ 412 case ALTQT_PRIQ: 413 error = priq_pfattach(a, ifq); 414 break; 415 #endif 416 #ifdef ALTQ_HFSC 417 case ALTQT_HFSC: 418 error = hfsc_pfattach(a, ifq); 419 break; 420 #endif 421 #ifdef ALTQ_FAIRQ 422 case ALTQT_FAIRQ: 423 error = fairq_pfattach(a, ifq); 424 break; 425 #endif 426 default: 427 error = ENXIO; 428 goto back; 429 } 430 431 /* if the state is running, enable altq */ 432 if (error == 0 && pfaltq_running && ifq->altq_type != ALTQT_NONE && 433 !ifq_is_enabled(ifq)) 434 error = altq_enable_locked(ifq); 435 436 /* if altq is already enabled, reset set tokenbucket regulator */ 437 if (error == 0 && ifq_is_enabled(ifq)) { 438 struct tb_profile tb; 439 440 tb.rate = a->ifbandwidth; 441 tb.depth = a->tbrsize; 442 error = tbr_set_locked(ifq, &tb); 443 } 444 back: 445 ifq_unlock_all(ifq); 446 return (error); 447 } 448 449 /* 450 * detach a discipline from the interface. 451 * it is possible that the discipline was already overridden by another 452 * discipline. 453 */ 454 int 455 altq_pfdetach(struct pf_altq *a) 456 { 457 struct ifnet *ifp; 458 struct ifaltq *ifq; 459 int error = 0; 460 461 ifp = ifunit(a->ifname); 462 if (ifp == NULL) 463 return (EINVAL); 464 ifq = &ifp->if_snd; 465 466 /* if this discipline is no longer referenced, just return */ 467 if (a->altq_disc == NULL) 468 return (0); 469 470 ifq_lock_all(ifq); 471 472 if (a->altq_disc != ifq->altq_disc) 473 goto back; 474 475 if (ifq_is_enabled(ifq)) 476 error = altq_disable_locked(ifq); 477 if (error == 0) 478 error = altq_detach_locked(ifq); 479 480 back: 481 ifq_unlock_all(ifq); 482 return (error); 483 } 484 485 /* 486 * add a discipline or a queue 487 */ 488 int 489 altq_add(struct pf_altq *a) 490 { 491 int error = 0; 492 493 if (a->qname[0] != 0) 494 return (altq_add_queue(a)); 495 496 if (machclk_freq == 0) 497 init_machclk(); 498 if (machclk_freq == 0) 499 panic("altq_add: no cpu clock"); 500 501 switch (a->scheduler) { 502 #ifdef ALTQ_CBQ 503 case ALTQT_CBQ: 504 error = cbq_add_altq(a); 505 break; 506 #endif 507 #ifdef ALTQ_PRIQ 508 case ALTQT_PRIQ: 509 error = priq_add_altq(a); 510 break; 511 #endif 512 #ifdef ALTQ_HFSC 513 case ALTQT_HFSC: 514 error = hfsc_add_altq(a); 515 break; 516 #endif 517 #ifdef ALTQ_FAIRQ 518 case ALTQT_FAIRQ: 519 error = fairq_add_altq(a); 520 break; 521 #endif 522 default: 523 error = ENXIO; 524 } 525 526 return (error); 527 } 528 529 /* 530 * remove a discipline or a queue 531 */ 532 int 533 altq_remove(struct pf_altq *a) 534 { 535 int error = 0; 536 537 if (a->qname[0] != 0) 538 return (altq_remove_queue(a)); 539 540 switch (a->scheduler) { 541 #ifdef ALTQ_CBQ 542 case ALTQT_CBQ: 543 error = cbq_remove_altq(a); 544 break; 545 #endif 546 #ifdef ALTQ_PRIQ 547 case ALTQT_PRIQ: 548 error = priq_remove_altq(a); 549 break; 550 #endif 551 #ifdef ALTQ_HFSC 552 case ALTQT_HFSC: 553 error = hfsc_remove_altq(a); 554 break; 555 #endif 556 #ifdef ALTQ_FAIRQ 557 case ALTQT_FAIRQ: 558 error = fairq_remove_altq(a); 559 break; 560 #endif 561 default: 562 error = ENXIO; 563 } 564 565 return (error); 566 } 567 568 /* 569 * add a queue to the discipline 570 */ 571 int 572 altq_add_queue(struct pf_altq *a) 573 { 574 int error = 0; 575 576 switch (a->scheduler) { 577 #ifdef ALTQ_CBQ 578 case ALTQT_CBQ: 579 error = cbq_add_queue(a); 580 break; 581 #endif 582 #ifdef ALTQ_PRIQ 583 case ALTQT_PRIQ: 584 error = priq_add_queue(a); 585 break; 586 #endif 587 #ifdef ALTQ_HFSC 588 case ALTQT_HFSC: 589 error = hfsc_add_queue(a); 590 break; 591 #endif 592 #ifdef ALTQ_FAIRQ 593 case ALTQT_FAIRQ: 594 error = fairq_add_queue(a); 595 break; 596 #endif 597 default: 598 error = ENXIO; 599 } 600 601 return (error); 602 } 603 604 /* 605 * remove a queue from the discipline 606 */ 607 int 608 altq_remove_queue(struct pf_altq *a) 609 { 610 int error = 0; 611 612 switch (a->scheduler) { 613 #ifdef ALTQ_CBQ 614 case ALTQT_CBQ: 615 error = cbq_remove_queue(a); 616 break; 617 #endif 618 #ifdef ALTQ_PRIQ 619 case ALTQT_PRIQ: 620 error = priq_remove_queue(a); 621 break; 622 #endif 623 #ifdef ALTQ_HFSC 624 case ALTQT_HFSC: 625 error = hfsc_remove_queue(a); 626 break; 627 #endif 628 #ifdef ALTQ_FAIRQ 629 case ALTQT_FAIRQ: 630 error = fairq_remove_queue(a); 631 break; 632 #endif 633 default: 634 error = ENXIO; 635 } 636 637 return (error); 638 } 639 640 /* 641 * get queue statistics 642 */ 643 int 644 altq_getqstats(struct pf_altq *a, void *ubuf, int *nbytes) 645 { 646 int error = 0; 647 648 switch (a->scheduler) { 649 #ifdef ALTQ_CBQ 650 case ALTQT_CBQ: 651 error = cbq_getqstats(a, ubuf, nbytes); 652 break; 653 #endif 654 #ifdef ALTQ_PRIQ 655 case ALTQT_PRIQ: 656 error = priq_getqstats(a, ubuf, nbytes); 657 break; 658 #endif 659 #ifdef ALTQ_HFSC 660 case ALTQT_HFSC: 661 error = hfsc_getqstats(a, ubuf, nbytes); 662 break; 663 #endif 664 #ifdef ALTQ_FAIRQ 665 case ALTQT_FAIRQ: 666 error = fairq_getqstats(a, ubuf, nbytes); 667 break; 668 #endif 669 default: 670 error = ENXIO; 671 } 672 673 return (error); 674 } 675 676 /* 677 * read and write diffserv field in IPv4 or IPv6 header 678 */ 679 uint8_t 680 read_dsfield(struct mbuf *m, struct altq_pktattr *pktattr) 681 { 682 struct mbuf *m0; 683 uint8_t ds_field = 0; 684 685 if (pktattr == NULL || 686 (pktattr->pattr_af != AF_INET && pktattr->pattr_af != AF_INET6)) 687 return ((uint8_t)0); 688 689 /* verify that pattr_hdr is within the mbuf data */ 690 for (m0 = m; m0 != NULL; m0 = m0->m_next) { 691 if ((pktattr->pattr_hdr >= m0->m_data) && 692 (pktattr->pattr_hdr < m0->m_data + m0->m_len)) 693 break; 694 } 695 if (m0 == NULL) { 696 /* ick, pattr_hdr is stale */ 697 pktattr->pattr_af = AF_UNSPEC; 698 #ifdef ALTQ_DEBUG 699 kprintf("read_dsfield: can't locate header!\n"); 700 #endif 701 return ((uint8_t)0); 702 } 703 704 if (pktattr->pattr_af == AF_INET) { 705 struct ip *ip = (struct ip *)pktattr->pattr_hdr; 706 707 if (ip->ip_v != 4) 708 return ((uint8_t)0); /* version mismatch! */ 709 ds_field = ip->ip_tos; 710 } 711 #ifdef INET6 712 else if (pktattr->pattr_af == AF_INET6) { 713 struct ip6_hdr *ip6 = (struct ip6_hdr *)pktattr->pattr_hdr; 714 uint32_t flowlabel; 715 716 flowlabel = ntohl(ip6->ip6_flow); 717 if ((flowlabel >> 28) != 6) 718 return ((uint8_t)0); /* version mismatch! */ 719 ds_field = (flowlabel >> 20) & 0xff; 720 } 721 #endif 722 return (ds_field); 723 } 724 725 void 726 write_dsfield(struct mbuf *m, struct altq_pktattr *pktattr, uint8_t dsfield) 727 { 728 struct mbuf *m0; 729 730 if (pktattr == NULL || 731 (pktattr->pattr_af != AF_INET && pktattr->pattr_af != AF_INET6)) 732 return; 733 734 /* verify that pattr_hdr is within the mbuf data */ 735 for (m0 = m; m0 != NULL; m0 = m0->m_next) { 736 if ((pktattr->pattr_hdr >= m0->m_data) && 737 (pktattr->pattr_hdr < m0->m_data + m0->m_len)) 738 break; 739 } 740 if (m0 == NULL) { 741 /* ick, pattr_hdr is stale */ 742 pktattr->pattr_af = AF_UNSPEC; 743 #ifdef ALTQ_DEBUG 744 kprintf("write_dsfield: can't locate header!\n"); 745 #endif 746 return; 747 } 748 749 if (pktattr->pattr_af == AF_INET) { 750 struct ip *ip = (struct ip *)pktattr->pattr_hdr; 751 uint8_t old; 752 int32_t sum; 753 754 if (ip->ip_v != 4) 755 return; /* version mismatch! */ 756 old = ip->ip_tos; 757 dsfield |= old & 3; /* leave CU bits */ 758 if (old == dsfield) 759 return; 760 ip->ip_tos = dsfield; 761 /* 762 * update checksum (from RFC1624) 763 * HC' = ~(~HC + ~m + m') 764 */ 765 sum = ~ntohs(ip->ip_sum) & 0xffff; 766 sum += 0xff00 + (~old & 0xff) + dsfield; 767 sum = (sum >> 16) + (sum & 0xffff); 768 sum += (sum >> 16); /* add carry */ 769 770 ip->ip_sum = htons(~sum & 0xffff); 771 } 772 #ifdef INET6 773 else if (pktattr->pattr_af == AF_INET6) { 774 struct ip6_hdr *ip6 = (struct ip6_hdr *)pktattr->pattr_hdr; 775 uint32_t flowlabel; 776 777 flowlabel = ntohl(ip6->ip6_flow); 778 if ((flowlabel >> 28) != 6) 779 return; /* version mismatch! */ 780 flowlabel = (flowlabel & 0xf03fffff) | (dsfield << 20); 781 ip6->ip6_flow = htonl(flowlabel); 782 } 783 #endif 784 } 785 786 /* 787 * high resolution clock support taking advantage of a machine dependent 788 * high resolution time counter (e.g., timestamp counter of intel pentium). 789 * we assume 790 * - 64-bit-long monotonically-increasing counter 791 * - frequency range is 100M-4GHz (CPU speed) 792 */ 793 /* if pcc is not available or disabled, emulate 256MHz using microtime() */ 794 #define MACHCLK_SHIFT 8 795 796 static int machclk_usepcc; 797 uint64_t machclk_freq = 0; 798 uint32_t machclk_per_tick = 0; 799 800 void 801 init_machclk(void) 802 { 803 callout_init(&tbr_callout); 804 805 #ifdef ALTQ_NOPCC 806 machclk_usepcc = 0; 807 #else 808 machclk_usepcc = 1; 809 #endif 810 811 #if defined(__i386__) || defined(__x86_64__) 812 if (!tsc_mpsync) 813 machclk_usepcc = 0; 814 #else 815 machclk_usepcc = 0; 816 #endif 817 818 if (!machclk_usepcc) { 819 /* emulate 256MHz using microtime() */ 820 machclk_freq = 1000000LLU << MACHCLK_SHIFT; 821 machclk_per_tick = machclk_freq / hz; 822 #ifdef ALTQ_DEBUG 823 kprintf("altq: emulate %juHz cpu clock\n", 824 (uintmax_t)machclk_freq); 825 #endif 826 return; 827 } 828 829 /* 830 * If the clock frequency (of Pentium TSC) is accessible, 831 * just use it. 832 */ 833 #ifdef _RDTSC_SUPPORTED_ 834 if (tsc_present) 835 machclk_freq = (uint64_t)tsc_frequency; 836 #endif 837 838 /* 839 * If we don't know the clock frequency, measure it. 840 */ 841 if (machclk_freq == 0) { 842 static int wait; 843 struct timeval tv_start, tv_end; 844 uint64_t start, end, diff; 845 int timo; 846 847 microtime(&tv_start); 848 start = read_machclk(); 849 timo = hz; /* 1 sec */ 850 tsleep(&wait, PCATCH, "init_machclk", timo); 851 microtime(&tv_end); 852 end = read_machclk(); 853 diff = (uint64_t)(tv_end.tv_sec - tv_start.tv_sec) * 1000000 854 + tv_end.tv_usec - tv_start.tv_usec; 855 if (diff != 0) 856 machclk_freq = (end - start) * 1000000 / diff; 857 } 858 859 machclk_per_tick = machclk_freq / hz; 860 861 #ifdef ALTQ_DEBUG 862 kprintf("altq: CPU clock: %juHz\n", (uintmax_t)machclk_freq); 863 #endif 864 } 865 866 uint64_t 867 read_machclk(void) 868 { 869 uint64_t val; 870 871 if (machclk_usepcc) { 872 #ifdef _RDTSC_SUPPORTED_ 873 val = rdtsc(); 874 #else 875 panic("read_machclk"); 876 #endif 877 } else { 878 struct timeval tv; 879 880 microtime(&tv); 881 val = (((uint64_t)(tv.tv_sec - boottime.tv_sec) * 1000000 882 + tv.tv_usec) << MACHCLK_SHIFT); 883 } 884 return (val); 885 } 886