1 /* $KAME: altq_subr.c,v 1.23 2004/04/20 16:10:06 itojun Exp $ */ 2 3 /* 4 * Copyright (C) 1997-2003 5 * Sony Computer Science Laboratories Inc. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include "opt_altq.h" 30 #include "opt_inet.h" 31 #include "opt_inet6.h" 32 33 #include <sys/param.h> 34 #include <sys/malloc.h> 35 #include <sys/mbuf.h> 36 #include <sys/systm.h> 37 #include <sys/proc.h> 38 #include <sys/socket.h> 39 #include <sys/socketvar.h> 40 #include <sys/kernel.h> 41 #include <sys/callout.h> 42 #include <sys/errno.h> 43 #include <sys/syslog.h> 44 #include <sys/sysctl.h> 45 #include <sys/queue.h> 46 #include <sys/thread2.h> 47 48 #include <net/if.h> 49 #include <net/if_dl.h> 50 #include <net/if_types.h> 51 #include <net/ifq_var.h> 52 #include <net/netmsg2.h> 53 #include <net/netisr2.h> 54 55 #include <netinet/in.h> 56 #include <netinet/in_systm.h> 57 #include <netinet/ip.h> 58 #ifdef INET6 59 #include <netinet/ip6.h> 60 #endif 61 #include <netinet/tcp.h> 62 #include <netinet/udp.h> 63 64 #include <net/pf/pfvar.h> 65 #include <net/altq/altq.h> 66 67 /* machine dependent clock related includes */ 68 #include <machine/clock.h> /* for tsc_frequency */ 69 #include <machine/md_var.h> /* for cpu_feature */ 70 #include <machine/specialreg.h> /* for CPUID_TSC */ 71 72 /* 73 * internal function prototypes 74 */ 75 static void tbr_timeout(void *); 76 static void tbr_timeout_dispatch(netmsg_t); 77 static int altq_enable_locked(struct ifaltq *); 78 static int altq_disable_locked(struct ifaltq *); 79 static int altq_detach_locked(struct ifaltq *); 80 static int tbr_set_locked(struct ifaltq *, struct tb_profile *); 81 82 int (*altq_input)(struct mbuf *, int) = NULL; 83 static int tbr_timer = 0; /* token bucket regulator timer */ 84 static struct callout tbr_callout; 85 static struct netmsg_base tbr_timeout_netmsg; 86 87 int pfaltq_running; /* keep track of running state */ 88 89 MALLOC_DEFINE(M_ALTQ, "altq", "ALTQ structures"); 90 91 /* 92 * alternate queueing support routines 93 */ 94 95 /* look up the queue state by the interface name and the queueing type. */ 96 void * 97 altq_lookup(const char *name, int type) 98 { 99 struct ifnet *ifp; 100 101 if ((ifp = ifunit(name)) != NULL) { 102 if (type != ALTQT_NONE && ifp->if_snd.altq_type == type) 103 return (ifp->if_snd.altq_disc); 104 } 105 106 return (NULL); 107 } 108 109 int 110 altq_attach(struct ifaltq *ifq, int type, void *discipline, 111 altq_mapsubq_t mapsubq, 112 ifsq_enqueue_t enqueue, ifsq_dequeue_t dequeue, ifsq_request_t request, 113 void *clfier, 114 void *(*classify)(struct ifaltq *, struct mbuf *, struct altq_pktattr *)) 115 { 116 if (!ifq_is_ready(ifq)) 117 return ENXIO; 118 119 ifq->altq_type = type; 120 ifq->altq_disc = discipline; 121 ifq->altq_clfier = clfier; 122 ifq->altq_classify = classify; 123 ifq->altq_flags &= (ALTQF_CANTCHANGE|ALTQF_ENABLED); 124 ifq_set_methods(ifq, mapsubq, enqueue, dequeue, request); 125 return 0; 126 } 127 128 static int 129 altq_detach_locked(struct ifaltq *ifq) 130 { 131 if (!ifq_is_ready(ifq)) 132 return ENXIO; 133 if (ifq_is_enabled(ifq)) 134 return EBUSY; 135 if (!ifq_is_attached(ifq)) 136 return (0); 137 138 ifq_set_classic(ifq); 139 ifq->altq_type = ALTQT_NONE; 140 ifq->altq_disc = NULL; 141 ifq->altq_clfier = NULL; 142 ifq->altq_classify = NULL; 143 ifq->altq_flags &= ALTQF_CANTCHANGE; 144 return 0; 145 } 146 147 int 148 altq_detach(struct ifaltq *ifq) 149 { 150 int error; 151 152 ifq_lock_all(ifq); 153 error = altq_detach_locked(ifq); 154 ifq_unlock_all(ifq); 155 return error; 156 } 157 158 static int 159 altq_enable_locked(struct ifaltq *ifq) 160 { 161 if (!ifq_is_ready(ifq)) 162 return ENXIO; 163 if (ifq_is_enabled(ifq)) 164 return 0; 165 166 ifq_purge_all_locked(ifq); 167 168 ifq->altq_flags |= ALTQF_ENABLED; 169 if (ifq->altq_clfier != NULL) 170 ifq->altq_flags |= ALTQF_CLASSIFY; 171 return 0; 172 } 173 174 int 175 altq_enable(struct ifaltq *ifq) 176 { 177 int error; 178 179 ifq_lock_all(ifq); 180 error = altq_enable_locked(ifq); 181 ifq_unlock_all(ifq); 182 return error; 183 } 184 185 static int 186 altq_disable_locked(struct ifaltq *ifq) 187 { 188 if (!ifq_is_enabled(ifq)) 189 return 0; 190 191 ifq_purge_all_locked(ifq); 192 ifq->altq_flags &= ~(ALTQF_ENABLED|ALTQF_CLASSIFY); 193 return 0; 194 } 195 196 int 197 altq_disable(struct ifaltq *ifq) 198 { 199 int error; 200 201 ifq_lock_all(ifq); 202 error = altq_disable_locked(ifq); 203 ifq_unlock_all(ifq); 204 return error; 205 } 206 207 /* 208 * internal representation of token bucket parameters 209 * rate: byte_per_unittime << 32 210 * (((bits_per_sec) / 8) << 32) / machclk_freq 211 * depth: byte << 32 212 * 213 */ 214 #define TBR_SHIFT 32 215 #define TBR_SCALE(x) ((int64_t)(x) << TBR_SHIFT) 216 #define TBR_UNSCALE(x) ((x) >> TBR_SHIFT) 217 218 struct mbuf * 219 tbr_dequeue(struct ifaltq_subque *ifsq, int op) 220 { 221 struct ifaltq *ifq = ifsq->ifsq_altq; 222 struct tb_regulator *tbr; 223 struct mbuf *m; 224 int64_t interval; 225 uint64_t now; 226 227 if (ifsq_get_index(ifsq) != ALTQ_SUBQ_INDEX_DEFAULT) { 228 /* 229 * Race happened, the unrelated subqueue was 230 * picked during the packet scheduler transition. 231 */ 232 ifsq_classic_request(ifsq, ALTRQ_PURGE, NULL); 233 return NULL; 234 } 235 236 crit_enter(); 237 tbr = ifq->altq_tbr; 238 if (op == ALTDQ_REMOVE && tbr->tbr_lastop == ALTDQ_POLL) { 239 /* if this is a remove after poll, bypass tbr check */ 240 } else { 241 /* update token only when it is negative */ 242 if (tbr->tbr_token <= 0) { 243 now = read_machclk(); 244 interval = now - tbr->tbr_last; 245 if (interval >= tbr->tbr_filluptime) 246 tbr->tbr_token = tbr->tbr_depth; 247 else { 248 tbr->tbr_token += interval * tbr->tbr_rate; 249 if (tbr->tbr_token > tbr->tbr_depth) 250 tbr->tbr_token = tbr->tbr_depth; 251 } 252 tbr->tbr_last = now; 253 } 254 /* if token is still negative, don't allow dequeue */ 255 if (tbr->tbr_token <= 0) { 256 crit_exit(); 257 return (NULL); 258 } 259 } 260 261 if (ifq_is_enabled(ifq)) 262 m = (*ifsq->ifsq_dequeue)(ifsq, op); 263 else 264 m = ifsq_classic_dequeue(ifsq, op); 265 266 if (m != NULL && op == ALTDQ_REMOVE) 267 tbr->tbr_token -= TBR_SCALE(m_pktlen(m)); 268 tbr->tbr_lastop = op; 269 crit_exit(); 270 return (m); 271 } 272 273 /* 274 * set a token bucket regulator. 275 * if the specified rate is zero, the token bucket regulator is deleted. 276 */ 277 static int 278 tbr_set_locked(struct ifaltq *ifq, struct tb_profile *profile) 279 { 280 struct tb_regulator *tbr, *otbr; 281 282 if (machclk_freq == 0) 283 init_machclk(); 284 if (machclk_freq == 0) { 285 kprintf("%s: no cpu clock available!\n", __func__); 286 return (ENXIO); 287 } 288 289 if (profile->rate == 0) { 290 /* delete this tbr */ 291 if ((tbr = ifq->altq_tbr) == NULL) 292 return (ENOENT); 293 ifq->altq_tbr = NULL; 294 kfree(tbr, M_ALTQ); 295 return (0); 296 } 297 298 tbr = kmalloc(sizeof(*tbr), M_ALTQ, M_WAITOK | M_ZERO); 299 tbr->tbr_rate = TBR_SCALE(profile->rate / 8) / machclk_freq; 300 tbr->tbr_depth = TBR_SCALE(profile->depth); 301 if (tbr->tbr_rate > 0) 302 tbr->tbr_filluptime = tbr->tbr_depth / tbr->tbr_rate; 303 else 304 tbr->tbr_filluptime = 0xffffffffffffffffLL; 305 tbr->tbr_token = tbr->tbr_depth; 306 tbr->tbr_last = read_machclk(); 307 tbr->tbr_lastop = ALTDQ_REMOVE; 308 309 otbr = ifq->altq_tbr; 310 ifq->altq_tbr = tbr; /* set the new tbr */ 311 312 if (otbr != NULL) 313 kfree(otbr, M_ALTQ); 314 else if (tbr_timer == 0) { 315 callout_reset_bycpu(&tbr_callout, 1, tbr_timeout, NULL, 0); 316 tbr_timer = 1; 317 } 318 return (0); 319 } 320 321 int 322 tbr_set(struct ifaltq *ifq, struct tb_profile *profile) 323 { 324 int error; 325 326 ifq_lock_all(ifq); 327 error = tbr_set_locked(ifq, profile); 328 ifq_unlock_all(ifq); 329 return error; 330 } 331 332 static void 333 tbr_timeout(void *arg __unused) 334 { 335 struct lwkt_msg *lmsg = &tbr_timeout_netmsg.lmsg; 336 337 KASSERT(mycpuid == 0, ("not on cpu0")); 338 crit_enter(); 339 if (lmsg->ms_flags & MSGF_DONE) 340 lwkt_sendmsg_oncpu(netisr_cpuport(0), lmsg); 341 crit_exit(); 342 } 343 344 /* 345 * tbr_timeout goes through the interface list, and kicks the drivers 346 * if necessary. 347 */ 348 static void 349 tbr_timeout_dispatch(netmsg_t nmsg) 350 { 351 const struct ifnet_array *arr; 352 int active, i; 353 354 ASSERT_IN_NETISR(0); 355 356 crit_enter(); 357 lwkt_replymsg(&nmsg->lmsg, 0); /* reply ASAP */ 358 crit_exit(); 359 360 active = 0; 361 arr = ifnet_array_get(); 362 for (i = 0; i < arr->ifnet_count; ++i) { 363 struct ifnet *ifp = arr->ifnet_arr[i]; 364 struct ifaltq_subque *ifsq; 365 366 if (ifp->if_snd.altq_tbr == NULL) 367 continue; 368 369 ifsq = &ifp->if_snd.altq_subq[ALTQ_SUBQ_INDEX_DEFAULT]; 370 active++; 371 if (!ifsq_is_empty(ifsq) && ifp->if_start != NULL) { 372 ifsq_serialize_hw(ifsq); 373 (*ifp->if_start)(ifp, ifsq); 374 ifsq_deserialize_hw(ifsq); 375 } 376 } 377 if (active > 0) 378 callout_reset(&tbr_callout, 1, tbr_timeout, NULL); 379 else 380 tbr_timer = 0; /* don't need tbr_timer anymore */ 381 } 382 383 /* 384 * get token bucket regulator profile 385 */ 386 int 387 tbr_get(struct ifaltq *ifq, struct tb_profile *profile) 388 { 389 struct tb_regulator *tbr; 390 391 if ((tbr = ifq->altq_tbr) == NULL) { 392 profile->rate = 0; 393 profile->depth = 0; 394 } else { 395 profile->rate = 396 (u_int)TBR_UNSCALE(tbr->tbr_rate * 8 * machclk_freq); 397 profile->depth = (u_int)TBR_UNSCALE(tbr->tbr_depth); 398 } 399 return (0); 400 } 401 402 /* 403 * attach a discipline to the interface. if one already exists, it is 404 * overridden. 405 */ 406 int 407 altq_pfattach(struct pf_altq *a) 408 { 409 struct ifaltq *ifq; 410 struct ifnet *ifp; 411 int error; 412 413 if (a->scheduler == ALTQT_NONE) 414 return 0; 415 416 if (a->altq_disc == NULL) 417 return EINVAL; 418 419 ifnet_lock(); 420 421 ifp = ifunit(a->ifname); 422 if (ifp == NULL) { 423 ifnet_unlock(); 424 return EINVAL; 425 } 426 ifq = &ifp->if_snd; 427 428 ifq_lock_all(ifq); 429 430 switch (a->scheduler) { 431 #ifdef ALTQ_CBQ 432 case ALTQT_CBQ: 433 error = cbq_pfattach(a, ifq); 434 break; 435 #endif 436 #ifdef ALTQ_PRIQ 437 case ALTQT_PRIQ: 438 error = priq_pfattach(a, ifq); 439 break; 440 #endif 441 #ifdef ALTQ_HFSC 442 case ALTQT_HFSC: 443 error = hfsc_pfattach(a, ifq); 444 break; 445 #endif 446 #ifdef ALTQ_FAIRQ 447 case ALTQT_FAIRQ: 448 error = fairq_pfattach(a, ifq); 449 break; 450 #endif 451 default: 452 error = ENXIO; 453 goto back; 454 } 455 456 /* if the state is running, enable altq */ 457 if (error == 0 && pfaltq_running && ifq->altq_type != ALTQT_NONE && 458 !ifq_is_enabled(ifq)) 459 error = altq_enable_locked(ifq); 460 461 /* if altq is already enabled, reset set tokenbucket regulator */ 462 if (error == 0 && ifq_is_enabled(ifq)) { 463 struct tb_profile tb; 464 465 tb.rate = a->ifbandwidth; 466 tb.depth = a->tbrsize; 467 error = tbr_set_locked(ifq, &tb); 468 } 469 back: 470 ifq_unlock_all(ifq); 471 ifnet_unlock(); 472 return (error); 473 } 474 475 /* 476 * detach a discipline from the interface. 477 * it is possible that the discipline was already overridden by another 478 * discipline. 479 */ 480 int 481 altq_pfdetach(struct pf_altq *a) 482 { 483 struct ifnet *ifp; 484 struct ifaltq *ifq; 485 int error = 0; 486 487 ifnet_lock(); 488 489 ifp = ifunit(a->ifname); 490 if (ifp == NULL) { 491 ifnet_unlock(); 492 return (EINVAL); 493 } 494 ifq = &ifp->if_snd; 495 496 /* if this discipline is no longer referenced, just return */ 497 if (a->altq_disc == NULL) { 498 ifnet_unlock(); 499 return (0); 500 } 501 502 ifq_lock_all(ifq); 503 504 if (a->altq_disc != ifq->altq_disc) 505 goto back; 506 507 if (ifq_is_enabled(ifq)) 508 error = altq_disable_locked(ifq); 509 if (error == 0) 510 error = altq_detach_locked(ifq); 511 512 back: 513 ifq_unlock_all(ifq); 514 ifnet_unlock(); 515 return (error); 516 } 517 518 /* 519 * add a discipline or a queue 520 */ 521 int 522 altq_add(struct pf_altq *a) 523 { 524 int error = 0; 525 526 if (a->qname[0] != 0) 527 return (altq_add_queue(a)); 528 529 if (machclk_freq == 0) 530 init_machclk(); 531 if (machclk_freq == 0) 532 panic("altq_add: no cpu clock"); 533 534 switch (a->scheduler) { 535 #ifdef ALTQ_CBQ 536 case ALTQT_CBQ: 537 error = cbq_add_altq(a); 538 break; 539 #endif 540 #ifdef ALTQ_PRIQ 541 case ALTQT_PRIQ: 542 error = priq_add_altq(a); 543 break; 544 #endif 545 #ifdef ALTQ_HFSC 546 case ALTQT_HFSC: 547 error = hfsc_add_altq(a); 548 break; 549 #endif 550 #ifdef ALTQ_FAIRQ 551 case ALTQT_FAIRQ: 552 error = fairq_add_altq(a); 553 break; 554 #endif 555 default: 556 error = ENXIO; 557 } 558 559 return (error); 560 } 561 562 /* 563 * remove a discipline or a queue 564 */ 565 int 566 altq_remove(struct pf_altq *a) 567 { 568 int error = 0; 569 570 if (a->qname[0] != 0) 571 return (altq_remove_queue(a)); 572 573 switch (a->scheduler) { 574 #ifdef ALTQ_CBQ 575 case ALTQT_CBQ: 576 error = cbq_remove_altq(a); 577 break; 578 #endif 579 #ifdef ALTQ_PRIQ 580 case ALTQT_PRIQ: 581 error = priq_remove_altq(a); 582 break; 583 #endif 584 #ifdef ALTQ_HFSC 585 case ALTQT_HFSC: 586 error = hfsc_remove_altq(a); 587 break; 588 #endif 589 #ifdef ALTQ_FAIRQ 590 case ALTQT_FAIRQ: 591 error = fairq_remove_altq(a); 592 break; 593 #endif 594 default: 595 error = ENXIO; 596 } 597 598 return (error); 599 } 600 601 /* 602 * add a queue to the discipline 603 */ 604 int 605 altq_add_queue(struct pf_altq *a) 606 { 607 int error = 0; 608 609 switch (a->scheduler) { 610 #ifdef ALTQ_CBQ 611 case ALTQT_CBQ: 612 error = cbq_add_queue(a); 613 break; 614 #endif 615 #ifdef ALTQ_PRIQ 616 case ALTQT_PRIQ: 617 error = priq_add_queue(a); 618 break; 619 #endif 620 #ifdef ALTQ_HFSC 621 case ALTQT_HFSC: 622 error = hfsc_add_queue(a); 623 break; 624 #endif 625 #ifdef ALTQ_FAIRQ 626 case ALTQT_FAIRQ: 627 error = fairq_add_queue(a); 628 break; 629 #endif 630 default: 631 error = ENXIO; 632 } 633 634 return (error); 635 } 636 637 /* 638 * remove a queue from the discipline 639 */ 640 int 641 altq_remove_queue(struct pf_altq *a) 642 { 643 int error = 0; 644 645 switch (a->scheduler) { 646 #ifdef ALTQ_CBQ 647 case ALTQT_CBQ: 648 error = cbq_remove_queue(a); 649 break; 650 #endif 651 #ifdef ALTQ_PRIQ 652 case ALTQT_PRIQ: 653 error = priq_remove_queue(a); 654 break; 655 #endif 656 #ifdef ALTQ_HFSC 657 case ALTQT_HFSC: 658 error = hfsc_remove_queue(a); 659 break; 660 #endif 661 #ifdef ALTQ_FAIRQ 662 case ALTQT_FAIRQ: 663 error = fairq_remove_queue(a); 664 break; 665 #endif 666 default: 667 error = ENXIO; 668 } 669 670 return (error); 671 } 672 673 /* 674 * get queue statistics 675 */ 676 int 677 altq_getqstats(struct pf_altq *a, void *ubuf, int *nbytes) 678 { 679 int error = 0; 680 681 switch (a->scheduler) { 682 #ifdef ALTQ_CBQ 683 case ALTQT_CBQ: 684 error = cbq_getqstats(a, ubuf, nbytes); 685 break; 686 #endif 687 #ifdef ALTQ_PRIQ 688 case ALTQT_PRIQ: 689 error = priq_getqstats(a, ubuf, nbytes); 690 break; 691 #endif 692 #ifdef ALTQ_HFSC 693 case ALTQT_HFSC: 694 error = hfsc_getqstats(a, ubuf, nbytes); 695 break; 696 #endif 697 #ifdef ALTQ_FAIRQ 698 case ALTQT_FAIRQ: 699 error = fairq_getqstats(a, ubuf, nbytes); 700 break; 701 #endif 702 default: 703 error = ENXIO; 704 } 705 706 return (error); 707 } 708 709 /* 710 * read and write diffserv field in IPv4 or IPv6 header 711 */ 712 uint8_t 713 read_dsfield(struct mbuf *m, struct altq_pktattr *pktattr) 714 { 715 struct mbuf *m0; 716 uint8_t ds_field = 0; 717 718 if (pktattr == NULL || 719 (pktattr->pattr_af != AF_INET && pktattr->pattr_af != AF_INET6)) 720 return ((uint8_t)0); 721 722 /* verify that pattr_hdr is within the mbuf data */ 723 for (m0 = m; m0 != NULL; m0 = m0->m_next) { 724 if ((pktattr->pattr_hdr >= m0->m_data) && 725 (pktattr->pattr_hdr < m0->m_data + m0->m_len)) 726 break; 727 } 728 if (m0 == NULL) { 729 /* ick, pattr_hdr is stale */ 730 pktattr->pattr_af = AF_UNSPEC; 731 #ifdef ALTQ_DEBUG 732 kprintf("read_dsfield: can't locate header!\n"); 733 #endif 734 return ((uint8_t)0); 735 } 736 737 if (pktattr->pattr_af == AF_INET) { 738 struct ip *ip = (struct ip *)pktattr->pattr_hdr; 739 740 if (ip->ip_v != 4) 741 return ((uint8_t)0); /* version mismatch! */ 742 ds_field = ip->ip_tos; 743 } 744 #ifdef INET6 745 else if (pktattr->pattr_af == AF_INET6) { 746 struct ip6_hdr *ip6 = (struct ip6_hdr *)pktattr->pattr_hdr; 747 uint32_t flowlabel; 748 749 flowlabel = ntohl(ip6->ip6_flow); 750 if ((flowlabel >> 28) != 6) 751 return ((uint8_t)0); /* version mismatch! */ 752 ds_field = (flowlabel >> 20) & 0xff; 753 } 754 #endif 755 return (ds_field); 756 } 757 758 void 759 write_dsfield(struct mbuf *m, struct altq_pktattr *pktattr, uint8_t dsfield) 760 { 761 struct mbuf *m0; 762 763 if (pktattr == NULL || 764 (pktattr->pattr_af != AF_INET && pktattr->pattr_af != AF_INET6)) 765 return; 766 767 /* verify that pattr_hdr is within the mbuf data */ 768 for (m0 = m; m0 != NULL; m0 = m0->m_next) { 769 if ((pktattr->pattr_hdr >= m0->m_data) && 770 (pktattr->pattr_hdr < m0->m_data + m0->m_len)) 771 break; 772 } 773 if (m0 == NULL) { 774 /* ick, pattr_hdr is stale */ 775 pktattr->pattr_af = AF_UNSPEC; 776 #ifdef ALTQ_DEBUG 777 kprintf("write_dsfield: can't locate header!\n"); 778 #endif 779 return; 780 } 781 782 if (pktattr->pattr_af == AF_INET) { 783 struct ip *ip = (struct ip *)pktattr->pattr_hdr; 784 uint8_t old; 785 int32_t sum; 786 787 if (ip->ip_v != 4) 788 return; /* version mismatch! */ 789 old = ip->ip_tos; 790 dsfield |= old & 3; /* leave CU bits */ 791 if (old == dsfield) 792 return; 793 ip->ip_tos = dsfield; 794 /* 795 * update checksum (from RFC1624) 796 * HC' = ~(~HC + ~m + m') 797 */ 798 sum = ~ntohs(ip->ip_sum) & 0xffff; 799 sum += 0xff00 + (~old & 0xff) + dsfield; 800 sum = (sum >> 16) + (sum & 0xffff); 801 sum += (sum >> 16); /* add carry */ 802 803 ip->ip_sum = htons(~sum & 0xffff); 804 } 805 #ifdef INET6 806 else if (pktattr->pattr_af == AF_INET6) { 807 struct ip6_hdr *ip6 = (struct ip6_hdr *)pktattr->pattr_hdr; 808 uint32_t flowlabel; 809 810 flowlabel = ntohl(ip6->ip6_flow); 811 if ((flowlabel >> 28) != 6) 812 return; /* version mismatch! */ 813 flowlabel = (flowlabel & 0xf03fffff) | (dsfield << 20); 814 ip6->ip6_flow = htonl(flowlabel); 815 } 816 #endif 817 } 818 819 /* 820 * high resolution clock support taking advantage of a machine dependent 821 * high resolution time counter (e.g., timestamp counter of intel pentium). 822 * we assume 823 * - 64-bit-long monotonically-increasing counter 824 * - frequency range is 100M-4GHz (CPU speed) 825 */ 826 /* if pcc is not available or disabled, emulate 256MHz using microtime() */ 827 #define MACHCLK_SHIFT 8 828 829 static int machclk_usepcc; 830 uint64_t machclk_freq = 0; 831 uint32_t machclk_per_tick = 0; 832 833 void 834 init_machclk(void) 835 { 836 callout_init_mp(&tbr_callout); 837 netmsg_init(&tbr_timeout_netmsg, NULL, &netisr_adone_rport, 838 MSGF_PRIORITY, tbr_timeout_dispatch); 839 840 #ifdef ALTQ_NOPCC 841 machclk_usepcc = 0; 842 #else 843 machclk_usepcc = 1; 844 #endif 845 846 #if defined(__x86_64__) 847 if (!tsc_mpsync) 848 machclk_usepcc = 0; 849 #else 850 machclk_usepcc = 0; 851 #endif 852 853 if (!machclk_usepcc) { 854 /* emulate 256MHz using microtime() */ 855 machclk_freq = 1000000LLU << MACHCLK_SHIFT; 856 machclk_per_tick = machclk_freq / hz; 857 #ifdef ALTQ_DEBUG 858 kprintf("altq: emulate %juHz cpu clock\n", 859 (uintmax_t)machclk_freq); 860 #endif 861 return; 862 } 863 864 /* 865 * If the clock frequency (of Pentium TSC) is accessible, 866 * just use it. 867 */ 868 #ifdef _RDTSC_SUPPORTED_ 869 if (tsc_present) 870 machclk_freq = (uint64_t)tsc_frequency; 871 #endif 872 873 /* 874 * If we don't know the clock frequency, measure it. 875 */ 876 if (machclk_freq == 0) { 877 static int wait; 878 struct timeval tv_start, tv_end; 879 uint64_t start, end, diff; 880 int timo; 881 882 microtime(&tv_start); 883 start = read_machclk(); 884 timo = hz; /* 1 sec */ 885 tsleep(&wait, PCATCH, "init_machclk", timo); 886 microtime(&tv_end); 887 end = read_machclk(); 888 diff = (uint64_t)(tv_end.tv_sec - tv_start.tv_sec) * 1000000 889 + tv_end.tv_usec - tv_start.tv_usec; 890 if (diff != 0) 891 machclk_freq = (end - start) * 1000000 / diff; 892 } 893 894 machclk_per_tick = machclk_freq / hz; 895 896 #ifdef ALTQ_DEBUG 897 kprintf("altq: CPU clock: %juHz\n", (uintmax_t)machclk_freq); 898 #endif 899 } 900 901 uint64_t 902 read_machclk(void) 903 { 904 uint64_t val; 905 906 if (machclk_usepcc) { 907 #ifdef _RDTSC_SUPPORTED_ 908 val = rdtsc(); 909 #else 910 panic("read_machclk"); 911 #endif 912 } else { 913 struct timeval tv; 914 915 microtime(&tv); 916 val = (((uint64_t)(tv.tv_sec - boottime.tv_sec) * 1000000 917 + tv.tv_usec) << MACHCLK_SHIFT); 918 } 919 return (val); 920 } 921