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, struct mbuf *mpolled, 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, mpolled, op); 260 } else if (op == ALTDQ_POLL) { 261 IF_POLL(ifsq, m); 262 } else { 263 IF_DEQUEUE(ifsq, m); 264 KKASSERT(mpolled == NULL || mpolled == m); 265 } 266 267 if (m != NULL && op == ALTDQ_REMOVE) 268 tbr->tbr_token -= TBR_SCALE(m_pktlen(m)); 269 tbr->tbr_lastop = op; 270 crit_exit(); 271 return (m); 272 } 273 274 /* 275 * set a token bucket regulator. 276 * if the specified rate is zero, the token bucket regulator is deleted. 277 */ 278 static int 279 tbr_set_locked(struct ifaltq *ifq, struct tb_profile *profile) 280 { 281 struct tb_regulator *tbr, *otbr; 282 283 if (machclk_freq == 0) 284 init_machclk(); 285 if (machclk_freq == 0) { 286 kprintf("%s: no cpu clock available!\n", __func__); 287 return (ENXIO); 288 } 289 290 if (profile->rate == 0) { 291 /* delete this tbr */ 292 if ((tbr = ifq->altq_tbr) == NULL) 293 return (ENOENT); 294 ifq->altq_tbr = NULL; 295 kfree(tbr, M_ALTQ); 296 return (0); 297 } 298 299 tbr = kmalloc(sizeof(*tbr), M_ALTQ, M_WAITOK | M_ZERO); 300 tbr->tbr_rate = TBR_SCALE(profile->rate / 8) / machclk_freq; 301 tbr->tbr_depth = TBR_SCALE(profile->depth); 302 if (tbr->tbr_rate > 0) 303 tbr->tbr_filluptime = tbr->tbr_depth / tbr->tbr_rate; 304 else 305 tbr->tbr_filluptime = 0xffffffffffffffffLL; 306 tbr->tbr_token = tbr->tbr_depth; 307 tbr->tbr_last = read_machclk(); 308 tbr->tbr_lastop = ALTDQ_REMOVE; 309 310 otbr = ifq->altq_tbr; 311 ifq->altq_tbr = tbr; /* set the new tbr */ 312 313 if (otbr != NULL) 314 kfree(otbr, M_ALTQ); 315 else if (tbr_timer == 0) { 316 callout_reset(&tbr_callout, 1, tbr_timeout, NULL); 317 tbr_timer = 1; 318 } 319 return (0); 320 } 321 322 int 323 tbr_set(struct ifaltq *ifq, struct tb_profile *profile) 324 { 325 int error; 326 327 ifq_lock_all(ifq); 328 error = tbr_set_locked(ifq, profile); 329 ifq_unlock_all(ifq); 330 return error; 331 } 332 333 /* 334 * tbr_timeout goes through the interface list, and kicks the drivers 335 * if necessary. 336 */ 337 static void 338 tbr_timeout(void *arg) 339 { 340 struct ifnet *ifp; 341 int active; 342 343 active = 0; 344 crit_enter(); 345 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 346 struct ifaltq_subque *ifsq; 347 348 if (ifp->if_snd.altq_tbr == NULL) 349 continue; 350 351 ifsq = &ifp->if_snd.altq_subq[ALTQ_SUBQ_INDEX_DEFAULT]; 352 active++; 353 if (!ifsq_is_empty(ifsq) && ifp->if_start != NULL) { 354 ifsq_serialize_hw(ifsq); 355 (*ifp->if_start)(ifp, ifsq); 356 ifsq_deserialize_hw(ifsq); 357 } 358 } 359 crit_exit(); 360 if (active > 0) 361 callout_reset(&tbr_callout, 1, tbr_timeout, NULL); 362 else 363 tbr_timer = 0; /* don't need tbr_timer anymore */ 364 } 365 366 /* 367 * get token bucket regulator profile 368 */ 369 int 370 tbr_get(struct ifaltq *ifq, struct tb_profile *profile) 371 { 372 struct tb_regulator *tbr; 373 374 if ((tbr = ifq->altq_tbr) == NULL) { 375 profile->rate = 0; 376 profile->depth = 0; 377 } else { 378 profile->rate = 379 (u_int)TBR_UNSCALE(tbr->tbr_rate * 8 * machclk_freq); 380 profile->depth = (u_int)TBR_UNSCALE(tbr->tbr_depth); 381 } 382 return (0); 383 } 384 385 /* 386 * attach a discipline to the interface. if one already exists, it is 387 * overridden. 388 */ 389 int 390 altq_pfattach(struct pf_altq *a) 391 { 392 struct ifaltq *ifq; 393 struct ifnet *ifp; 394 int error; 395 396 if (a->scheduler == ALTQT_NONE) 397 return 0; 398 399 if (a->altq_disc == NULL) 400 return EINVAL; 401 402 ifp = ifunit(a->ifname); 403 if (ifp == NULL) 404 return EINVAL; 405 ifq = &ifp->if_snd; 406 407 ifq_lock_all(ifq); 408 409 switch (a->scheduler) { 410 #ifdef ALTQ_CBQ 411 case ALTQT_CBQ: 412 error = cbq_pfattach(a, ifq); 413 break; 414 #endif 415 #ifdef ALTQ_PRIQ 416 case ALTQT_PRIQ: 417 error = priq_pfattach(a, ifq); 418 break; 419 #endif 420 #ifdef ALTQ_HFSC 421 case ALTQT_HFSC: 422 error = hfsc_pfattach(a, ifq); 423 break; 424 #endif 425 #ifdef ALTQ_FAIRQ 426 case ALTQT_FAIRQ: 427 error = fairq_pfattach(a, ifq); 428 break; 429 #endif 430 default: 431 error = ENXIO; 432 goto back; 433 } 434 435 /* if the state is running, enable altq */ 436 if (error == 0 && pfaltq_running && ifq->altq_type != ALTQT_NONE && 437 !ifq_is_enabled(ifq)) 438 error = altq_enable_locked(ifq); 439 440 /* if altq is already enabled, reset set tokenbucket regulator */ 441 if (error == 0 && ifq_is_enabled(ifq)) { 442 struct tb_profile tb; 443 444 tb.rate = a->ifbandwidth; 445 tb.depth = a->tbrsize; 446 error = tbr_set_locked(ifq, &tb); 447 } 448 back: 449 ifq_unlock_all(ifq); 450 return (error); 451 } 452 453 /* 454 * detach a discipline from the interface. 455 * it is possible that the discipline was already overridden by another 456 * discipline. 457 */ 458 int 459 altq_pfdetach(struct pf_altq *a) 460 { 461 struct ifnet *ifp; 462 struct ifaltq *ifq; 463 int error = 0; 464 465 ifp = ifunit(a->ifname); 466 if (ifp == NULL) 467 return (EINVAL); 468 ifq = &ifp->if_snd; 469 470 /* if this discipline is no longer referenced, just return */ 471 if (a->altq_disc == NULL) 472 return (0); 473 474 ifq_lock_all(ifq); 475 476 if (a->altq_disc != ifq->altq_disc) 477 goto back; 478 479 if (ifq_is_enabled(ifq)) 480 error = altq_disable_locked(ifq); 481 if (error == 0) 482 error = altq_detach_locked(ifq); 483 484 back: 485 ifq_unlock_all(ifq); 486 return (error); 487 } 488 489 /* 490 * add a discipline or a queue 491 */ 492 int 493 altq_add(struct pf_altq *a) 494 { 495 int error = 0; 496 497 if (a->qname[0] != 0) 498 return (altq_add_queue(a)); 499 500 if (machclk_freq == 0) 501 init_machclk(); 502 if (machclk_freq == 0) 503 panic("altq_add: no cpu clock"); 504 505 switch (a->scheduler) { 506 #ifdef ALTQ_CBQ 507 case ALTQT_CBQ: 508 error = cbq_add_altq(a); 509 break; 510 #endif 511 #ifdef ALTQ_PRIQ 512 case ALTQT_PRIQ: 513 error = priq_add_altq(a); 514 break; 515 #endif 516 #ifdef ALTQ_HFSC 517 case ALTQT_HFSC: 518 error = hfsc_add_altq(a); 519 break; 520 #endif 521 #ifdef ALTQ_FAIRQ 522 case ALTQT_FAIRQ: 523 error = fairq_add_altq(a); 524 break; 525 #endif 526 default: 527 error = ENXIO; 528 } 529 530 return (error); 531 } 532 533 /* 534 * remove a discipline or a queue 535 */ 536 int 537 altq_remove(struct pf_altq *a) 538 { 539 int error = 0; 540 541 if (a->qname[0] != 0) 542 return (altq_remove_queue(a)); 543 544 switch (a->scheduler) { 545 #ifdef ALTQ_CBQ 546 case ALTQT_CBQ: 547 error = cbq_remove_altq(a); 548 break; 549 #endif 550 #ifdef ALTQ_PRIQ 551 case ALTQT_PRIQ: 552 error = priq_remove_altq(a); 553 break; 554 #endif 555 #ifdef ALTQ_HFSC 556 case ALTQT_HFSC: 557 error = hfsc_remove_altq(a); 558 break; 559 #endif 560 #ifdef ALTQ_FAIRQ 561 case ALTQT_FAIRQ: 562 error = fairq_remove_altq(a); 563 break; 564 #endif 565 default: 566 error = ENXIO; 567 } 568 569 return (error); 570 } 571 572 /* 573 * add a queue to the discipline 574 */ 575 int 576 altq_add_queue(struct pf_altq *a) 577 { 578 int error = 0; 579 580 switch (a->scheduler) { 581 #ifdef ALTQ_CBQ 582 case ALTQT_CBQ: 583 error = cbq_add_queue(a); 584 break; 585 #endif 586 #ifdef ALTQ_PRIQ 587 case ALTQT_PRIQ: 588 error = priq_add_queue(a); 589 break; 590 #endif 591 #ifdef ALTQ_HFSC 592 case ALTQT_HFSC: 593 error = hfsc_add_queue(a); 594 break; 595 #endif 596 #ifdef ALTQ_FAIRQ 597 case ALTQT_FAIRQ: 598 error = fairq_add_queue(a); 599 break; 600 #endif 601 default: 602 error = ENXIO; 603 } 604 605 return (error); 606 } 607 608 /* 609 * remove a queue from the discipline 610 */ 611 int 612 altq_remove_queue(struct pf_altq *a) 613 { 614 int error = 0; 615 616 switch (a->scheduler) { 617 #ifdef ALTQ_CBQ 618 case ALTQT_CBQ: 619 error = cbq_remove_queue(a); 620 break; 621 #endif 622 #ifdef ALTQ_PRIQ 623 case ALTQT_PRIQ: 624 error = priq_remove_queue(a); 625 break; 626 #endif 627 #ifdef ALTQ_HFSC 628 case ALTQT_HFSC: 629 error = hfsc_remove_queue(a); 630 break; 631 #endif 632 #ifdef ALTQ_FAIRQ 633 case ALTQT_FAIRQ: 634 error = fairq_remove_queue(a); 635 break; 636 #endif 637 default: 638 error = ENXIO; 639 } 640 641 return (error); 642 } 643 644 /* 645 * get queue statistics 646 */ 647 int 648 altq_getqstats(struct pf_altq *a, void *ubuf, int *nbytes) 649 { 650 int error = 0; 651 652 switch (a->scheduler) { 653 #ifdef ALTQ_CBQ 654 case ALTQT_CBQ: 655 error = cbq_getqstats(a, ubuf, nbytes); 656 break; 657 #endif 658 #ifdef ALTQ_PRIQ 659 case ALTQT_PRIQ: 660 error = priq_getqstats(a, ubuf, nbytes); 661 break; 662 #endif 663 #ifdef ALTQ_HFSC 664 case ALTQT_HFSC: 665 error = hfsc_getqstats(a, ubuf, nbytes); 666 break; 667 #endif 668 #ifdef ALTQ_FAIRQ 669 case ALTQT_FAIRQ: 670 error = fairq_getqstats(a, ubuf, nbytes); 671 break; 672 #endif 673 default: 674 error = ENXIO; 675 } 676 677 return (error); 678 } 679 680 /* 681 * read and write diffserv field in IPv4 or IPv6 header 682 */ 683 uint8_t 684 read_dsfield(struct mbuf *m, struct altq_pktattr *pktattr) 685 { 686 struct mbuf *m0; 687 uint8_t ds_field = 0; 688 689 if (pktattr == NULL || 690 (pktattr->pattr_af != AF_INET && pktattr->pattr_af != AF_INET6)) 691 return ((uint8_t)0); 692 693 /* verify that pattr_hdr is within the mbuf data */ 694 for (m0 = m; m0 != NULL; m0 = m0->m_next) { 695 if ((pktattr->pattr_hdr >= m0->m_data) && 696 (pktattr->pattr_hdr < m0->m_data + m0->m_len)) 697 break; 698 } 699 if (m0 == NULL) { 700 /* ick, pattr_hdr is stale */ 701 pktattr->pattr_af = AF_UNSPEC; 702 #ifdef ALTQ_DEBUG 703 kprintf("read_dsfield: can't locate header!\n"); 704 #endif 705 return ((uint8_t)0); 706 } 707 708 if (pktattr->pattr_af == AF_INET) { 709 struct ip *ip = (struct ip *)pktattr->pattr_hdr; 710 711 if (ip->ip_v != 4) 712 return ((uint8_t)0); /* version mismatch! */ 713 ds_field = ip->ip_tos; 714 } 715 #ifdef INET6 716 else if (pktattr->pattr_af == AF_INET6) { 717 struct ip6_hdr *ip6 = (struct ip6_hdr *)pktattr->pattr_hdr; 718 uint32_t flowlabel; 719 720 flowlabel = ntohl(ip6->ip6_flow); 721 if ((flowlabel >> 28) != 6) 722 return ((uint8_t)0); /* version mismatch! */ 723 ds_field = (flowlabel >> 20) & 0xff; 724 } 725 #endif 726 return (ds_field); 727 } 728 729 void 730 write_dsfield(struct mbuf *m, struct altq_pktattr *pktattr, uint8_t dsfield) 731 { 732 struct mbuf *m0; 733 734 if (pktattr == NULL || 735 (pktattr->pattr_af != AF_INET && pktattr->pattr_af != AF_INET6)) 736 return; 737 738 /* verify that pattr_hdr is within the mbuf data */ 739 for (m0 = m; m0 != NULL; m0 = m0->m_next) { 740 if ((pktattr->pattr_hdr >= m0->m_data) && 741 (pktattr->pattr_hdr < m0->m_data + m0->m_len)) 742 break; 743 } 744 if (m0 == NULL) { 745 /* ick, pattr_hdr is stale */ 746 pktattr->pattr_af = AF_UNSPEC; 747 #ifdef ALTQ_DEBUG 748 kprintf("write_dsfield: can't locate header!\n"); 749 #endif 750 return; 751 } 752 753 if (pktattr->pattr_af == AF_INET) { 754 struct ip *ip = (struct ip *)pktattr->pattr_hdr; 755 uint8_t old; 756 int32_t sum; 757 758 if (ip->ip_v != 4) 759 return; /* version mismatch! */ 760 old = ip->ip_tos; 761 dsfield |= old & 3; /* leave CU bits */ 762 if (old == dsfield) 763 return; 764 ip->ip_tos = dsfield; 765 /* 766 * update checksum (from RFC1624) 767 * HC' = ~(~HC + ~m + m') 768 */ 769 sum = ~ntohs(ip->ip_sum) & 0xffff; 770 sum += 0xff00 + (~old & 0xff) + dsfield; 771 sum = (sum >> 16) + (sum & 0xffff); 772 sum += (sum >> 16); /* add carry */ 773 774 ip->ip_sum = htons(~sum & 0xffff); 775 } 776 #ifdef INET6 777 else if (pktattr->pattr_af == AF_INET6) { 778 struct ip6_hdr *ip6 = (struct ip6_hdr *)pktattr->pattr_hdr; 779 uint32_t flowlabel; 780 781 flowlabel = ntohl(ip6->ip6_flow); 782 if ((flowlabel >> 28) != 6) 783 return; /* version mismatch! */ 784 flowlabel = (flowlabel & 0xf03fffff) | (dsfield << 20); 785 ip6->ip6_flow = htonl(flowlabel); 786 } 787 #endif 788 } 789 790 /* 791 * high resolution clock support taking advantage of a machine dependent 792 * high resolution time counter (e.g., timestamp counter of intel pentium). 793 * we assume 794 * - 64-bit-long monotonically-increasing counter 795 * - frequency range is 100M-4GHz (CPU speed) 796 */ 797 /* if pcc is not available or disabled, emulate 256MHz using microtime() */ 798 #define MACHCLK_SHIFT 8 799 800 int machclk_usepcc; 801 uint64_t machclk_freq = 0; 802 uint32_t machclk_per_tick = 0; 803 804 void 805 init_machclk(void) 806 { 807 callout_init(&tbr_callout); 808 809 machclk_usepcc = 1; 810 811 #if !defined(__i386__) || defined(ALTQ_NOPCC) 812 machclk_usepcc = 0; 813 #elif defined(__DragonFly__) 814 machclk_usepcc = 0; 815 #elif defined(__i386__) 816 /* check if TSC is available */ 817 if (machclk_usepcc == 1 && (cpu_feature & CPUID_TSC) == 0) 818 machclk_usepcc = 0; 819 #endif 820 821 if (machclk_usepcc == 0) { 822 /* emulate 256MHz using microtime() */ 823 machclk_freq = 1000000LLU << MACHCLK_SHIFT; 824 machclk_per_tick = machclk_freq / hz; 825 #ifdef ALTQ_DEBUG 826 kprintf("altq: emulate %juHz cpu clock\n", (uintmax_t)machclk_freq); 827 #endif 828 return; 829 } 830 831 /* 832 * if the clock frequency (of Pentium TSC or Alpha PCC) is 833 * accessible, just use it. 834 */ 835 #ifdef _RDTSC_SUPPORTED_ 836 if (cpu_feature & CPUID_TSC) 837 machclk_freq = (uint64_t)tsc_frequency; 838 #endif 839 840 /* 841 * if we don't know the clock frequency, measure it. 842 */ 843 if (machclk_freq == 0) { 844 static int wait; 845 struct timeval tv_start, tv_end; 846 uint64_t start, end, diff; 847 int timo; 848 849 microtime(&tv_start); 850 start = read_machclk(); 851 timo = hz; /* 1 sec */ 852 tsleep(&wait, PCATCH, "init_machclk", timo); 853 microtime(&tv_end); 854 end = read_machclk(); 855 diff = (uint64_t)(tv_end.tv_sec - tv_start.tv_sec) * 1000000 856 + tv_end.tv_usec - tv_start.tv_usec; 857 if (diff != 0) 858 machclk_freq = (end - start) * 1000000 / diff; 859 } 860 861 machclk_per_tick = machclk_freq / hz; 862 863 #ifdef ALTQ_DEBUG 864 kprintf("altq: CPU clock: %juHz\n", (uintmax_t)machclk_freq); 865 #endif 866 } 867 868 uint64_t 869 read_machclk(void) 870 { 871 uint64_t val; 872 873 if (machclk_usepcc) { 874 #ifdef _RDTSC_SUPPORTED_ 875 val = rdtsc(); 876 #else 877 panic("read_machclk"); 878 #endif 879 } else { 880 struct timeval tv; 881 882 microtime(&tv); 883 val = (((uint64_t)(tv.tv_sec - boottime.tv_sec) * 1000000 884 + tv.tv_usec) << MACHCLK_SHIFT); 885 } 886 return (val); 887 } 888 889