1 /* 2 * Copyright (c) 2003 Patrick McHardy, <kaber@trash.net> 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 2 7 * of the License, or (at your option) any later version. 8 * 9 * 2003-10-17 - Ported from altq 10 */ 11 /* 12 * Copyright (c) 1997-1999 Carnegie Mellon University. All Rights Reserved. 13 * 14 * Permission to use, copy, modify, and distribute this software and 15 * its documentation is hereby granted (including for commercial or 16 * for-profit use), provided that both the copyright notice and this 17 * permission notice appear in all copies of the software, derivative 18 * works, or modified versions, and any portions thereof. 19 * 20 * THIS SOFTWARE IS EXPERIMENTAL AND IS KNOWN TO HAVE BUGS, SOME OF 21 * WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON PROVIDES THIS 22 * SOFTWARE IN ITS ``AS IS'' CONDITION, AND ANY EXPRESS OR IMPLIED 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 25 * DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 28 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 32 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 33 * DAMAGE. 34 * 35 * Carnegie Mellon encourages (but does not require) users of this 36 * software to return any improvements or extensions that they make, 37 * and to grant Carnegie Mellon the rights to redistribute these 38 * changes without encumbrance. 39 */ 40 /* 41 * H-FSC is described in Proceedings of SIGCOMM'97, 42 * "A Hierarchical Fair Service Curve Algorithm for Link-Sharing, 43 * Real-Time and Priority Service" 44 * by Ion Stoica, Hui Zhang, and T. S. Eugene Ng. 45 * 46 * Oleg Cherevko <olwi@aq.ml.com.ua> added the upperlimit for link-sharing. 47 * when a class has an upperlimit, the fit-time is computed from the 48 * upperlimit service curve. the link-sharing scheduler does not schedule 49 * a class whose fit-time exceeds the current time. 50 */ 51 52 #include <linux/kernel.h> 53 #include <linux/module.h> 54 #include <linux/types.h> 55 #include <linux/errno.h> 56 #include <linux/compiler.h> 57 #include <linux/spinlock.h> 58 #include <linux/skbuff.h> 59 #include <linux/string.h> 60 #include <linux/slab.h> 61 #include <linux/list.h> 62 #include <linux/rbtree.h> 63 #include <linux/init.h> 64 #include <linux/rtnetlink.h> 65 #include <linux/pkt_sched.h> 66 #include <net/netlink.h> 67 #include <net/pkt_sched.h> 68 #include <net/pkt_cls.h> 69 #include <asm/div64.h> 70 71 /* 72 * kernel internal service curve representation: 73 * coordinates are given by 64 bit unsigned integers. 74 * x-axis: unit is clock count. 75 * y-axis: unit is byte. 76 * 77 * The service curve parameters are converted to the internal 78 * representation. The slope values are scaled to avoid overflow. 79 * the inverse slope values as well as the y-projection of the 1st 80 * segment are kept in order to avoid 64-bit divide operations 81 * that are expensive on 32-bit architectures. 82 */ 83 84 struct internal_sc { 85 u64 sm1; /* scaled slope of the 1st segment */ 86 u64 ism1; /* scaled inverse-slope of the 1st segment */ 87 u64 dx; /* the x-projection of the 1st segment */ 88 u64 dy; /* the y-projection of the 1st segment */ 89 u64 sm2; /* scaled slope of the 2nd segment */ 90 u64 ism2; /* scaled inverse-slope of the 2nd segment */ 91 }; 92 93 /* runtime service curve */ 94 struct runtime_sc { 95 u64 x; /* current starting position on x-axis */ 96 u64 y; /* current starting position on y-axis */ 97 u64 sm1; /* scaled slope of the 1st segment */ 98 u64 ism1; /* scaled inverse-slope of the 1st segment */ 99 u64 dx; /* the x-projection of the 1st segment */ 100 u64 dy; /* the y-projection of the 1st segment */ 101 u64 sm2; /* scaled slope of the 2nd segment */ 102 u64 ism2; /* scaled inverse-slope of the 2nd segment */ 103 }; 104 105 enum hfsc_class_flags { 106 HFSC_RSC = 0x1, 107 HFSC_FSC = 0x2, 108 HFSC_USC = 0x4 109 }; 110 111 struct hfsc_class { 112 struct Qdisc_class_common cl_common; 113 114 struct gnet_stats_basic_sync bstats; 115 struct gnet_stats_queue qstats; 116 struct net_rate_estimator __rcu *rate_est; 117 struct tcf_proto __rcu *filter_list; /* filter list */ 118 struct tcf_block *block; 119 unsigned int level; /* class level in hierarchy */ 120 121 struct hfsc_sched *sched; /* scheduler data */ 122 struct hfsc_class *cl_parent; /* parent class */ 123 struct list_head siblings; /* sibling classes */ 124 struct list_head children; /* child classes */ 125 struct Qdisc *qdisc; /* leaf qdisc */ 126 127 struct rb_node el_node; /* qdisc's eligible tree member */ 128 struct rb_root vt_tree; /* active children sorted by cl_vt */ 129 struct rb_node vt_node; /* parent's vt_tree member */ 130 struct rb_root cf_tree; /* active children sorted by cl_f */ 131 struct rb_node cf_node; /* parent's cf_heap member */ 132 133 u64 cl_total; /* total work in bytes */ 134 u64 cl_cumul; /* cumulative work in bytes done by 135 real-time criteria */ 136 137 u64 cl_d; /* deadline*/ 138 u64 cl_e; /* eligible time */ 139 u64 cl_vt; /* virtual time */ 140 u64 cl_f; /* time when this class will fit for 141 link-sharing, max(myf, cfmin) */ 142 u64 cl_myf; /* my fit-time (calculated from this 143 class's own upperlimit curve) */ 144 u64 cl_cfmin; /* earliest children's fit-time (used 145 with cl_myf to obtain cl_f) */ 146 u64 cl_cvtmin; /* minimal virtual time among the 147 children fit for link-sharing 148 (monotonic within a period) */ 149 u64 cl_vtadj; /* intra-period cumulative vt 150 adjustment */ 151 u64 cl_cvtoff; /* largest virtual time seen among 152 the children */ 153 154 struct internal_sc cl_rsc; /* internal real-time service curve */ 155 struct internal_sc cl_fsc; /* internal fair service curve */ 156 struct internal_sc cl_usc; /* internal upperlimit service curve */ 157 struct runtime_sc cl_deadline; /* deadline curve */ 158 struct runtime_sc cl_eligible; /* eligible curve */ 159 struct runtime_sc cl_virtual; /* virtual curve */ 160 struct runtime_sc cl_ulimit; /* upperlimit curve */ 161 162 u8 cl_flags; /* which curves are valid */ 163 u32 cl_vtperiod; /* vt period sequence number */ 164 u32 cl_parentperiod;/* parent's vt period sequence number*/ 165 u32 cl_nactive; /* number of active children */ 166 }; 167 168 struct hfsc_sched { 169 u16 defcls; /* default class id */ 170 struct hfsc_class root; /* root class */ 171 struct Qdisc_class_hash clhash; /* class hash */ 172 struct rb_root eligible; /* eligible tree */ 173 struct qdisc_watchdog watchdog; /* watchdog timer */ 174 }; 175 176 #define HT_INFINITY 0xffffffffffffffffULL /* infinite time value */ 177 178 179 /* 180 * eligible tree holds backlogged classes being sorted by their eligible times. 181 * there is one eligible tree per hfsc instance. 182 */ 183 184 static void 185 eltree_insert(struct hfsc_class *cl) 186 { 187 struct rb_node **p = &cl->sched->eligible.rb_node; 188 struct rb_node *parent = NULL; 189 struct hfsc_class *cl1; 190 191 while (*p != NULL) { 192 parent = *p; 193 cl1 = rb_entry(parent, struct hfsc_class, el_node); 194 if (cl->cl_e >= cl1->cl_e) 195 p = &parent->rb_right; 196 else 197 p = &parent->rb_left; 198 } 199 rb_link_node(&cl->el_node, parent, p); 200 rb_insert_color(&cl->el_node, &cl->sched->eligible); 201 } 202 203 static inline void 204 eltree_remove(struct hfsc_class *cl) 205 { 206 rb_erase(&cl->el_node, &cl->sched->eligible); 207 } 208 209 static inline void 210 eltree_update(struct hfsc_class *cl) 211 { 212 eltree_remove(cl); 213 eltree_insert(cl); 214 } 215 216 /* find the class with the minimum deadline among the eligible classes */ 217 static inline struct hfsc_class * 218 eltree_get_mindl(struct hfsc_sched *q, u64 cur_time) 219 { 220 struct hfsc_class *p, *cl = NULL; 221 struct rb_node *n; 222 223 for (n = rb_first(&q->eligible); n != NULL; n = rb_next(n)) { 224 p = rb_entry(n, struct hfsc_class, el_node); 225 if (p->cl_e > cur_time) 226 break; 227 if (cl == NULL || p->cl_d < cl->cl_d) 228 cl = p; 229 } 230 return cl; 231 } 232 233 /* find the class with minimum eligible time among the eligible classes */ 234 static inline struct hfsc_class * 235 eltree_get_minel(struct hfsc_sched *q) 236 { 237 struct rb_node *n; 238 239 n = rb_first(&q->eligible); 240 if (n == NULL) 241 return NULL; 242 return rb_entry(n, struct hfsc_class, el_node); 243 } 244 245 /* 246 * vttree holds holds backlogged child classes being sorted by their virtual 247 * time. each intermediate class has one vttree. 248 */ 249 static void 250 vttree_insert(struct hfsc_class *cl) 251 { 252 struct rb_node **p = &cl->cl_parent->vt_tree.rb_node; 253 struct rb_node *parent = NULL; 254 struct hfsc_class *cl1; 255 256 while (*p != NULL) { 257 parent = *p; 258 cl1 = rb_entry(parent, struct hfsc_class, vt_node); 259 if (cl->cl_vt >= cl1->cl_vt) 260 p = &parent->rb_right; 261 else 262 p = &parent->rb_left; 263 } 264 rb_link_node(&cl->vt_node, parent, p); 265 rb_insert_color(&cl->vt_node, &cl->cl_parent->vt_tree); 266 } 267 268 static inline void 269 vttree_remove(struct hfsc_class *cl) 270 { 271 rb_erase(&cl->vt_node, &cl->cl_parent->vt_tree); 272 } 273 274 static inline void 275 vttree_update(struct hfsc_class *cl) 276 { 277 vttree_remove(cl); 278 vttree_insert(cl); 279 } 280 281 static inline struct hfsc_class * 282 vttree_firstfit(struct hfsc_class *cl, u64 cur_time) 283 { 284 struct hfsc_class *p; 285 struct rb_node *n; 286 287 for (n = rb_first(&cl->vt_tree); n != NULL; n = rb_next(n)) { 288 p = rb_entry(n, struct hfsc_class, vt_node); 289 if (p->cl_f <= cur_time) 290 return p; 291 } 292 return NULL; 293 } 294 295 /* 296 * get the leaf class with the minimum vt in the hierarchy 297 */ 298 static struct hfsc_class * 299 vttree_get_minvt(struct hfsc_class *cl, u64 cur_time) 300 { 301 /* if root-class's cfmin is bigger than cur_time nothing to do */ 302 if (cl->cl_cfmin > cur_time) 303 return NULL; 304 305 while (cl->level > 0) { 306 cl = vttree_firstfit(cl, cur_time); 307 if (cl == NULL) 308 return NULL; 309 /* 310 * update parent's cl_cvtmin. 311 */ 312 if (cl->cl_parent->cl_cvtmin < cl->cl_vt) 313 cl->cl_parent->cl_cvtmin = cl->cl_vt; 314 } 315 return cl; 316 } 317 318 static void 319 cftree_insert(struct hfsc_class *cl) 320 { 321 struct rb_node **p = &cl->cl_parent->cf_tree.rb_node; 322 struct rb_node *parent = NULL; 323 struct hfsc_class *cl1; 324 325 while (*p != NULL) { 326 parent = *p; 327 cl1 = rb_entry(parent, struct hfsc_class, cf_node); 328 if (cl->cl_f >= cl1->cl_f) 329 p = &parent->rb_right; 330 else 331 p = &parent->rb_left; 332 } 333 rb_link_node(&cl->cf_node, parent, p); 334 rb_insert_color(&cl->cf_node, &cl->cl_parent->cf_tree); 335 } 336 337 static inline void 338 cftree_remove(struct hfsc_class *cl) 339 { 340 rb_erase(&cl->cf_node, &cl->cl_parent->cf_tree); 341 } 342 343 static inline void 344 cftree_update(struct hfsc_class *cl) 345 { 346 cftree_remove(cl); 347 cftree_insert(cl); 348 } 349 350 /* 351 * service curve support functions 352 * 353 * external service curve parameters 354 * m: bps 355 * d: us 356 * internal service curve parameters 357 * sm: (bytes/psched_us) << SM_SHIFT 358 * ism: (psched_us/byte) << ISM_SHIFT 359 * dx: psched_us 360 * 361 * The clock source resolution with ktime and PSCHED_SHIFT 10 is 1.024us. 362 * 363 * sm and ism are scaled in order to keep effective digits. 364 * SM_SHIFT and ISM_SHIFT are selected to keep at least 4 effective 365 * digits in decimal using the following table. 366 * 367 * bits/sec 100Kbps 1Mbps 10Mbps 100Mbps 1Gbps 368 * ------------+------------------------------------------------------- 369 * bytes/1.024us 12.8e-3 128e-3 1280e-3 12800e-3 128000e-3 370 * 371 * 1.024us/byte 78.125 7.8125 0.78125 0.078125 0.0078125 372 * 373 * So, for PSCHED_SHIFT 10 we need: SM_SHIFT 20, ISM_SHIFT 18. 374 */ 375 #define SM_SHIFT (30 - PSCHED_SHIFT) 376 #define ISM_SHIFT (8 + PSCHED_SHIFT) 377 378 #define SM_MASK ((1ULL << SM_SHIFT) - 1) 379 #define ISM_MASK ((1ULL << ISM_SHIFT) - 1) 380 381 static inline u64 382 seg_x2y(u64 x, u64 sm) 383 { 384 u64 y; 385 386 /* 387 * compute 388 * y = x * sm >> SM_SHIFT 389 * but divide it for the upper and lower bits to avoid overflow 390 */ 391 y = (x >> SM_SHIFT) * sm + (((x & SM_MASK) * sm) >> SM_SHIFT); 392 return y; 393 } 394 395 static inline u64 396 seg_y2x(u64 y, u64 ism) 397 { 398 u64 x; 399 400 if (y == 0) 401 x = 0; 402 else if (ism == HT_INFINITY) 403 x = HT_INFINITY; 404 else { 405 x = (y >> ISM_SHIFT) * ism 406 + (((y & ISM_MASK) * ism) >> ISM_SHIFT); 407 } 408 return x; 409 } 410 411 /* Convert m (bps) into sm (bytes/psched us) */ 412 static u64 413 m2sm(u32 m) 414 { 415 u64 sm; 416 417 sm = ((u64)m << SM_SHIFT); 418 sm += PSCHED_TICKS_PER_SEC - 1; 419 do_div(sm, PSCHED_TICKS_PER_SEC); 420 return sm; 421 } 422 423 /* convert m (bps) into ism (psched us/byte) */ 424 static u64 425 m2ism(u32 m) 426 { 427 u64 ism; 428 429 if (m == 0) 430 ism = HT_INFINITY; 431 else { 432 ism = ((u64)PSCHED_TICKS_PER_SEC << ISM_SHIFT); 433 ism += m - 1; 434 do_div(ism, m); 435 } 436 return ism; 437 } 438 439 /* convert d (us) into dx (psched us) */ 440 static u64 441 d2dx(u32 d) 442 { 443 u64 dx; 444 445 dx = ((u64)d * PSCHED_TICKS_PER_SEC); 446 dx += USEC_PER_SEC - 1; 447 do_div(dx, USEC_PER_SEC); 448 return dx; 449 } 450 451 /* convert sm (bytes/psched us) into m (bps) */ 452 static u32 453 sm2m(u64 sm) 454 { 455 u64 m; 456 457 m = (sm * PSCHED_TICKS_PER_SEC) >> SM_SHIFT; 458 return (u32)m; 459 } 460 461 /* convert dx (psched us) into d (us) */ 462 static u32 463 dx2d(u64 dx) 464 { 465 u64 d; 466 467 d = dx * USEC_PER_SEC; 468 do_div(d, PSCHED_TICKS_PER_SEC); 469 return (u32)d; 470 } 471 472 static void 473 sc2isc(struct tc_service_curve *sc, struct internal_sc *isc) 474 { 475 isc->sm1 = m2sm(sc->m1); 476 isc->ism1 = m2ism(sc->m1); 477 isc->dx = d2dx(sc->d); 478 isc->dy = seg_x2y(isc->dx, isc->sm1); 479 isc->sm2 = m2sm(sc->m2); 480 isc->ism2 = m2ism(sc->m2); 481 } 482 483 /* 484 * initialize the runtime service curve with the given internal 485 * service curve starting at (x, y). 486 */ 487 static void 488 rtsc_init(struct runtime_sc *rtsc, struct internal_sc *isc, u64 x, u64 y) 489 { 490 rtsc->x = x; 491 rtsc->y = y; 492 rtsc->sm1 = isc->sm1; 493 rtsc->ism1 = isc->ism1; 494 rtsc->dx = isc->dx; 495 rtsc->dy = isc->dy; 496 rtsc->sm2 = isc->sm2; 497 rtsc->ism2 = isc->ism2; 498 } 499 500 /* 501 * calculate the y-projection of the runtime service curve by the 502 * given x-projection value 503 */ 504 static u64 505 rtsc_y2x(struct runtime_sc *rtsc, u64 y) 506 { 507 u64 x; 508 509 if (y < rtsc->y) 510 x = rtsc->x; 511 else if (y <= rtsc->y + rtsc->dy) { 512 /* x belongs to the 1st segment */ 513 if (rtsc->dy == 0) 514 x = rtsc->x + rtsc->dx; 515 else 516 x = rtsc->x + seg_y2x(y - rtsc->y, rtsc->ism1); 517 } else { 518 /* x belongs to the 2nd segment */ 519 x = rtsc->x + rtsc->dx 520 + seg_y2x(y - rtsc->y - rtsc->dy, rtsc->ism2); 521 } 522 return x; 523 } 524 525 static u64 526 rtsc_x2y(struct runtime_sc *rtsc, u64 x) 527 { 528 u64 y; 529 530 if (x <= rtsc->x) 531 y = rtsc->y; 532 else if (x <= rtsc->x + rtsc->dx) 533 /* y belongs to the 1st segment */ 534 y = rtsc->y + seg_x2y(x - rtsc->x, rtsc->sm1); 535 else 536 /* y belongs to the 2nd segment */ 537 y = rtsc->y + rtsc->dy 538 + seg_x2y(x - rtsc->x - rtsc->dx, rtsc->sm2); 539 return y; 540 } 541 542 /* 543 * update the runtime service curve by taking the minimum of the current 544 * runtime service curve and the service curve starting at (x, y). 545 */ 546 static void 547 rtsc_min(struct runtime_sc *rtsc, struct internal_sc *isc, u64 x, u64 y) 548 { 549 u64 y1, y2, dx, dy; 550 u32 dsm; 551 552 if (isc->sm1 <= isc->sm2) { 553 /* service curve is convex */ 554 y1 = rtsc_x2y(rtsc, x); 555 if (y1 < y) 556 /* the current rtsc is smaller */ 557 return; 558 rtsc->x = x; 559 rtsc->y = y; 560 return; 561 } 562 563 /* 564 * service curve is concave 565 * compute the two y values of the current rtsc 566 * y1: at x 567 * y2: at (x + dx) 568 */ 569 y1 = rtsc_x2y(rtsc, x); 570 if (y1 <= y) { 571 /* rtsc is below isc, no change to rtsc */ 572 return; 573 } 574 575 y2 = rtsc_x2y(rtsc, x + isc->dx); 576 if (y2 >= y + isc->dy) { 577 /* rtsc is above isc, replace rtsc by isc */ 578 rtsc->x = x; 579 rtsc->y = y; 580 rtsc->dx = isc->dx; 581 rtsc->dy = isc->dy; 582 return; 583 } 584 585 /* 586 * the two curves intersect 587 * compute the offsets (dx, dy) using the reverse 588 * function of seg_x2y() 589 * seg_x2y(dx, sm1) == seg_x2y(dx, sm2) + (y1 - y) 590 */ 591 dx = (y1 - y) << SM_SHIFT; 592 dsm = isc->sm1 - isc->sm2; 593 do_div(dx, dsm); 594 /* 595 * check if (x, y1) belongs to the 1st segment of rtsc. 596 * if so, add the offset. 597 */ 598 if (rtsc->x + rtsc->dx > x) 599 dx += rtsc->x + rtsc->dx - x; 600 dy = seg_x2y(dx, isc->sm1); 601 602 rtsc->x = x; 603 rtsc->y = y; 604 rtsc->dx = dx; 605 rtsc->dy = dy; 606 } 607 608 static void 609 init_ed(struct hfsc_class *cl, unsigned int next_len) 610 { 611 u64 cur_time = psched_get_time(); 612 613 /* update the deadline curve */ 614 rtsc_min(&cl->cl_deadline, &cl->cl_rsc, cur_time, cl->cl_cumul); 615 616 /* 617 * update the eligible curve. 618 * for concave, it is equal to the deadline curve. 619 * for convex, it is a linear curve with slope m2. 620 */ 621 cl->cl_eligible = cl->cl_deadline; 622 if (cl->cl_rsc.sm1 <= cl->cl_rsc.sm2) { 623 cl->cl_eligible.dx = 0; 624 cl->cl_eligible.dy = 0; 625 } 626 627 /* compute e and d */ 628 cl->cl_e = rtsc_y2x(&cl->cl_eligible, cl->cl_cumul); 629 cl->cl_d = rtsc_y2x(&cl->cl_deadline, cl->cl_cumul + next_len); 630 631 eltree_insert(cl); 632 } 633 634 static void 635 update_ed(struct hfsc_class *cl, unsigned int next_len) 636 { 637 cl->cl_e = rtsc_y2x(&cl->cl_eligible, cl->cl_cumul); 638 cl->cl_d = rtsc_y2x(&cl->cl_deadline, cl->cl_cumul + next_len); 639 640 eltree_update(cl); 641 } 642 643 static inline void 644 update_d(struct hfsc_class *cl, unsigned int next_len) 645 { 646 cl->cl_d = rtsc_y2x(&cl->cl_deadline, cl->cl_cumul + next_len); 647 } 648 649 static inline void 650 update_cfmin(struct hfsc_class *cl) 651 { 652 struct rb_node *n = rb_first(&cl->cf_tree); 653 struct hfsc_class *p; 654 655 if (n == NULL) { 656 cl->cl_cfmin = 0; 657 return; 658 } 659 p = rb_entry(n, struct hfsc_class, cf_node); 660 cl->cl_cfmin = p->cl_f; 661 } 662 663 static void 664 init_vf(struct hfsc_class *cl, unsigned int len) 665 { 666 struct hfsc_class *max_cl; 667 struct rb_node *n; 668 u64 vt, f, cur_time; 669 int go_active; 670 671 cur_time = 0; 672 go_active = 1; 673 for (; cl->cl_parent != NULL; cl = cl->cl_parent) { 674 if (go_active && cl->cl_nactive++ == 0) 675 go_active = 1; 676 else 677 go_active = 0; 678 679 if (go_active) { 680 n = rb_last(&cl->cl_parent->vt_tree); 681 if (n != NULL) { 682 max_cl = rb_entry(n, struct hfsc_class, vt_node); 683 /* 684 * set vt to the average of the min and max 685 * classes. if the parent's period didn't 686 * change, don't decrease vt of the class. 687 */ 688 vt = max_cl->cl_vt; 689 if (cl->cl_parent->cl_cvtmin != 0) 690 vt = (cl->cl_parent->cl_cvtmin + vt)/2; 691 692 if (cl->cl_parent->cl_vtperiod != 693 cl->cl_parentperiod || vt > cl->cl_vt) 694 cl->cl_vt = vt; 695 } else { 696 /* 697 * first child for a new parent backlog period. 698 * initialize cl_vt to the highest value seen 699 * among the siblings. this is analogous to 700 * what cur_time would provide in realtime case. 701 */ 702 cl->cl_vt = cl->cl_parent->cl_cvtoff; 703 cl->cl_parent->cl_cvtmin = 0; 704 } 705 706 /* update the virtual curve */ 707 rtsc_min(&cl->cl_virtual, &cl->cl_fsc, cl->cl_vt, cl->cl_total); 708 cl->cl_vtadj = 0; 709 710 cl->cl_vtperiod++; /* increment vt period */ 711 cl->cl_parentperiod = cl->cl_parent->cl_vtperiod; 712 if (cl->cl_parent->cl_nactive == 0) 713 cl->cl_parentperiod++; 714 cl->cl_f = 0; 715 716 vttree_insert(cl); 717 cftree_insert(cl); 718 719 if (cl->cl_flags & HFSC_USC) { 720 /* class has upper limit curve */ 721 if (cur_time == 0) 722 cur_time = psched_get_time(); 723 724 /* update the ulimit curve */ 725 rtsc_min(&cl->cl_ulimit, &cl->cl_usc, cur_time, 726 cl->cl_total); 727 /* compute myf */ 728 cl->cl_myf = rtsc_y2x(&cl->cl_ulimit, 729 cl->cl_total); 730 } 731 } 732 733 f = max(cl->cl_myf, cl->cl_cfmin); 734 if (f != cl->cl_f) { 735 cl->cl_f = f; 736 cftree_update(cl); 737 } 738 update_cfmin(cl->cl_parent); 739 } 740 } 741 742 static void 743 update_vf(struct hfsc_class *cl, unsigned int len, u64 cur_time) 744 { 745 u64 f; /* , myf_bound, delta; */ 746 int go_passive = 0; 747 748 if (cl->qdisc->q.qlen == 0 && cl->cl_flags & HFSC_FSC) 749 go_passive = 1; 750 751 for (; cl->cl_parent != NULL; cl = cl->cl_parent) { 752 cl->cl_total += len; 753 754 if (!(cl->cl_flags & HFSC_FSC) || cl->cl_nactive == 0) 755 continue; 756 757 if (go_passive && --cl->cl_nactive == 0) 758 go_passive = 1; 759 else 760 go_passive = 0; 761 762 /* update vt */ 763 cl->cl_vt = rtsc_y2x(&cl->cl_virtual, cl->cl_total) + cl->cl_vtadj; 764 765 /* 766 * if vt of the class is smaller than cvtmin, 767 * the class was skipped in the past due to non-fit. 768 * if so, we need to adjust vtadj. 769 */ 770 if (cl->cl_vt < cl->cl_parent->cl_cvtmin) { 771 cl->cl_vtadj += cl->cl_parent->cl_cvtmin - cl->cl_vt; 772 cl->cl_vt = cl->cl_parent->cl_cvtmin; 773 } 774 775 if (go_passive) { 776 /* no more active child, going passive */ 777 778 /* update cvtoff of the parent class */ 779 if (cl->cl_vt > cl->cl_parent->cl_cvtoff) 780 cl->cl_parent->cl_cvtoff = cl->cl_vt; 781 782 /* remove this class from the vt tree */ 783 vttree_remove(cl); 784 785 cftree_remove(cl); 786 update_cfmin(cl->cl_parent); 787 788 continue; 789 } 790 791 /* update the vt tree */ 792 vttree_update(cl); 793 794 /* update f */ 795 if (cl->cl_flags & HFSC_USC) { 796 cl->cl_myf = rtsc_y2x(&cl->cl_ulimit, cl->cl_total); 797 #if 0 798 cl->cl_myf = cl->cl_myfadj + rtsc_y2x(&cl->cl_ulimit, 799 cl->cl_total); 800 /* 801 * This code causes classes to stay way under their 802 * limit when multiple classes are used at gigabit 803 * speed. needs investigation. -kaber 804 */ 805 /* 806 * if myf lags behind by more than one clock tick 807 * from the current time, adjust myfadj to prevent 808 * a rate-limited class from going greedy. 809 * in a steady state under rate-limiting, myf 810 * fluctuates within one clock tick. 811 */ 812 myf_bound = cur_time - PSCHED_JIFFIE2US(1); 813 if (cl->cl_myf < myf_bound) { 814 delta = cur_time - cl->cl_myf; 815 cl->cl_myfadj += delta; 816 cl->cl_myf += delta; 817 } 818 #endif 819 } 820 821 f = max(cl->cl_myf, cl->cl_cfmin); 822 if (f != cl->cl_f) { 823 cl->cl_f = f; 824 cftree_update(cl); 825 update_cfmin(cl->cl_parent); 826 } 827 } 828 } 829 830 static unsigned int 831 qdisc_peek_len(struct Qdisc *sch) 832 { 833 struct sk_buff *skb; 834 unsigned int len; 835 836 skb = sch->ops->peek(sch); 837 if (unlikely(skb == NULL)) { 838 qdisc_warn_nonwc("qdisc_peek_len", sch); 839 return 0; 840 } 841 len = qdisc_pkt_len(skb); 842 843 return len; 844 } 845 846 static void 847 hfsc_adjust_levels(struct hfsc_class *cl) 848 { 849 struct hfsc_class *p; 850 unsigned int level; 851 852 do { 853 level = 0; 854 list_for_each_entry(p, &cl->children, siblings) { 855 if (p->level >= level) 856 level = p->level + 1; 857 } 858 cl->level = level; 859 } while ((cl = cl->cl_parent) != NULL); 860 } 861 862 static inline struct hfsc_class * 863 hfsc_find_class(u32 classid, struct Qdisc *sch) 864 { 865 struct hfsc_sched *q = qdisc_priv(sch); 866 struct Qdisc_class_common *clc; 867 868 clc = qdisc_class_find(&q->clhash, classid); 869 if (clc == NULL) 870 return NULL; 871 return container_of(clc, struct hfsc_class, cl_common); 872 } 873 874 static void 875 hfsc_change_rsc(struct hfsc_class *cl, struct tc_service_curve *rsc, 876 u64 cur_time) 877 { 878 sc2isc(rsc, &cl->cl_rsc); 879 rtsc_init(&cl->cl_deadline, &cl->cl_rsc, cur_time, cl->cl_cumul); 880 cl->cl_eligible = cl->cl_deadline; 881 if (cl->cl_rsc.sm1 <= cl->cl_rsc.sm2) { 882 cl->cl_eligible.dx = 0; 883 cl->cl_eligible.dy = 0; 884 } 885 cl->cl_flags |= HFSC_RSC; 886 } 887 888 static void 889 hfsc_change_fsc(struct hfsc_class *cl, struct tc_service_curve *fsc) 890 { 891 sc2isc(fsc, &cl->cl_fsc); 892 rtsc_init(&cl->cl_virtual, &cl->cl_fsc, cl->cl_vt, cl->cl_total); 893 cl->cl_flags |= HFSC_FSC; 894 } 895 896 static void 897 hfsc_change_usc(struct hfsc_class *cl, struct tc_service_curve *usc, 898 u64 cur_time) 899 { 900 sc2isc(usc, &cl->cl_usc); 901 rtsc_init(&cl->cl_ulimit, &cl->cl_usc, cur_time, cl->cl_total); 902 cl->cl_flags |= HFSC_USC; 903 } 904 905 static const struct nla_policy hfsc_policy[TCA_HFSC_MAX + 1] = { 906 [TCA_HFSC_RSC] = { .len = sizeof(struct tc_service_curve) }, 907 [TCA_HFSC_FSC] = { .len = sizeof(struct tc_service_curve) }, 908 [TCA_HFSC_USC] = { .len = sizeof(struct tc_service_curve) }, 909 }; 910 911 static int 912 hfsc_change_class(struct Qdisc *sch, u32 classid, u32 parentid, 913 struct nlattr **tca, unsigned long *arg, 914 struct netlink_ext_ack *extack) 915 { 916 struct hfsc_sched *q = qdisc_priv(sch); 917 struct hfsc_class *cl = (struct hfsc_class *)*arg; 918 struct hfsc_class *parent = NULL; 919 struct nlattr *opt = tca[TCA_OPTIONS]; 920 struct nlattr *tb[TCA_HFSC_MAX + 1]; 921 struct tc_service_curve *rsc = NULL, *fsc = NULL, *usc = NULL; 922 u64 cur_time; 923 int err; 924 925 if (opt == NULL) 926 return -EINVAL; 927 928 err = nla_parse_nested_deprecated(tb, TCA_HFSC_MAX, opt, hfsc_policy, 929 NULL); 930 if (err < 0) 931 return err; 932 933 if (tb[TCA_HFSC_RSC]) { 934 rsc = nla_data(tb[TCA_HFSC_RSC]); 935 if (rsc->m1 == 0 && rsc->m2 == 0) 936 rsc = NULL; 937 } 938 939 if (tb[TCA_HFSC_FSC]) { 940 fsc = nla_data(tb[TCA_HFSC_FSC]); 941 if (fsc->m1 == 0 && fsc->m2 == 0) 942 fsc = NULL; 943 } 944 945 if (tb[TCA_HFSC_USC]) { 946 usc = nla_data(tb[TCA_HFSC_USC]); 947 if (usc->m1 == 0 && usc->m2 == 0) 948 usc = NULL; 949 } 950 951 if (cl != NULL) { 952 int old_flags; 953 954 if (parentid) { 955 if (cl->cl_parent && 956 cl->cl_parent->cl_common.classid != parentid) 957 return -EINVAL; 958 if (cl->cl_parent == NULL && parentid != TC_H_ROOT) 959 return -EINVAL; 960 } 961 cur_time = psched_get_time(); 962 963 if (tca[TCA_RATE]) { 964 err = gen_replace_estimator(&cl->bstats, NULL, 965 &cl->rate_est, 966 NULL, 967 true, 968 tca[TCA_RATE]); 969 if (err) 970 return err; 971 } 972 973 sch_tree_lock(sch); 974 old_flags = cl->cl_flags; 975 976 if (rsc != NULL) 977 hfsc_change_rsc(cl, rsc, cur_time); 978 if (fsc != NULL) 979 hfsc_change_fsc(cl, fsc); 980 if (usc != NULL) 981 hfsc_change_usc(cl, usc, cur_time); 982 983 if (cl->qdisc->q.qlen != 0) { 984 int len = qdisc_peek_len(cl->qdisc); 985 986 if (cl->cl_flags & HFSC_RSC) { 987 if (old_flags & HFSC_RSC) 988 update_ed(cl, len); 989 else 990 init_ed(cl, len); 991 } 992 993 if (cl->cl_flags & HFSC_FSC) { 994 if (old_flags & HFSC_FSC) 995 update_vf(cl, 0, cur_time); 996 else 997 init_vf(cl, len); 998 } 999 } 1000 sch_tree_unlock(sch); 1001 1002 return 0; 1003 } 1004 1005 if (parentid == TC_H_ROOT) 1006 return -EEXIST; 1007 1008 parent = &q->root; 1009 if (parentid) { 1010 parent = hfsc_find_class(parentid, sch); 1011 if (parent == NULL) 1012 return -ENOENT; 1013 } 1014 if (!(parent->cl_flags & HFSC_FSC) && parent != &q->root) { 1015 NL_SET_ERR_MSG(extack, "Invalid parent - parent class must have FSC"); 1016 return -EINVAL; 1017 } 1018 1019 if (classid == 0 || TC_H_MAJ(classid ^ sch->handle) != 0) 1020 return -EINVAL; 1021 if (hfsc_find_class(classid, sch)) 1022 return -EEXIST; 1023 1024 if (rsc == NULL && fsc == NULL) 1025 return -EINVAL; 1026 1027 cl = kzalloc(sizeof(struct hfsc_class), GFP_KERNEL); 1028 if (cl == NULL) 1029 return -ENOBUFS; 1030 1031 err = tcf_block_get(&cl->block, &cl->filter_list, sch, extack); 1032 if (err) { 1033 kfree(cl); 1034 return err; 1035 } 1036 1037 if (tca[TCA_RATE]) { 1038 err = gen_new_estimator(&cl->bstats, NULL, &cl->rate_est, 1039 NULL, true, tca[TCA_RATE]); 1040 if (err) { 1041 tcf_block_put(cl->block); 1042 kfree(cl); 1043 return err; 1044 } 1045 } 1046 1047 if (rsc != NULL) 1048 hfsc_change_rsc(cl, rsc, 0); 1049 if (fsc != NULL) 1050 hfsc_change_fsc(cl, fsc); 1051 if (usc != NULL) 1052 hfsc_change_usc(cl, usc, 0); 1053 1054 cl->cl_common.classid = classid; 1055 cl->sched = q; 1056 cl->cl_parent = parent; 1057 cl->qdisc = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, 1058 classid, NULL); 1059 if (cl->qdisc == NULL) 1060 cl->qdisc = &noop_qdisc; 1061 else 1062 qdisc_hash_add(cl->qdisc, true); 1063 INIT_LIST_HEAD(&cl->children); 1064 cl->vt_tree = RB_ROOT; 1065 cl->cf_tree = RB_ROOT; 1066 1067 sch_tree_lock(sch); 1068 qdisc_class_hash_insert(&q->clhash, &cl->cl_common); 1069 list_add_tail(&cl->siblings, &parent->children); 1070 if (parent->level == 0) 1071 qdisc_purge_queue(parent->qdisc); 1072 hfsc_adjust_levels(parent); 1073 sch_tree_unlock(sch); 1074 1075 qdisc_class_hash_grow(sch, &q->clhash); 1076 1077 *arg = (unsigned long)cl; 1078 return 0; 1079 } 1080 1081 static void 1082 hfsc_destroy_class(struct Qdisc *sch, struct hfsc_class *cl) 1083 { 1084 struct hfsc_sched *q = qdisc_priv(sch); 1085 1086 tcf_block_put(cl->block); 1087 qdisc_put(cl->qdisc); 1088 gen_kill_estimator(&cl->rate_est); 1089 if (cl != &q->root) 1090 kfree(cl); 1091 } 1092 1093 static int 1094 hfsc_delete_class(struct Qdisc *sch, unsigned long arg, 1095 struct netlink_ext_ack *extack) 1096 { 1097 struct hfsc_sched *q = qdisc_priv(sch); 1098 struct hfsc_class *cl = (struct hfsc_class *)arg; 1099 1100 if (cl->level > 0 || qdisc_class_in_use(&cl->cl_common) || 1101 cl == &q->root) { 1102 NL_SET_ERR_MSG(extack, "HFSC class in use"); 1103 return -EBUSY; 1104 } 1105 1106 sch_tree_lock(sch); 1107 1108 list_del(&cl->siblings); 1109 hfsc_adjust_levels(cl->cl_parent); 1110 1111 qdisc_purge_queue(cl->qdisc); 1112 qdisc_class_hash_remove(&q->clhash, &cl->cl_common); 1113 1114 sch_tree_unlock(sch); 1115 1116 hfsc_destroy_class(sch, cl); 1117 return 0; 1118 } 1119 1120 static struct hfsc_class * 1121 hfsc_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr) 1122 { 1123 struct hfsc_sched *q = qdisc_priv(sch); 1124 struct hfsc_class *head, *cl; 1125 struct tcf_result res; 1126 struct tcf_proto *tcf; 1127 int result; 1128 1129 if (TC_H_MAJ(skb->priority ^ sch->handle) == 0 && 1130 (cl = hfsc_find_class(skb->priority, sch)) != NULL) 1131 if (cl->level == 0) 1132 return cl; 1133 1134 *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; 1135 head = &q->root; 1136 tcf = rcu_dereference_bh(q->root.filter_list); 1137 while (tcf && (result = tcf_classify(skb, NULL, tcf, &res, false)) >= 0) { 1138 #ifdef CONFIG_NET_CLS_ACT 1139 switch (result) { 1140 case TC_ACT_QUEUED: 1141 case TC_ACT_STOLEN: 1142 case TC_ACT_TRAP: 1143 *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; 1144 fallthrough; 1145 case TC_ACT_SHOT: 1146 return NULL; 1147 } 1148 #endif 1149 cl = (struct hfsc_class *)res.class; 1150 if (!cl) { 1151 cl = hfsc_find_class(res.classid, sch); 1152 if (!cl) 1153 break; /* filter selected invalid classid */ 1154 if (cl->level >= head->level) 1155 break; /* filter may only point downwards */ 1156 } 1157 1158 if (cl->level == 0) 1159 return cl; /* hit leaf class */ 1160 1161 /* apply inner filter chain */ 1162 tcf = rcu_dereference_bh(cl->filter_list); 1163 head = cl; 1164 } 1165 1166 /* classification failed, try default class */ 1167 cl = hfsc_find_class(TC_H_MAKE(TC_H_MAJ(sch->handle), q->defcls), sch); 1168 if (cl == NULL || cl->level > 0) 1169 return NULL; 1170 1171 return cl; 1172 } 1173 1174 static int 1175 hfsc_graft_class(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, 1176 struct Qdisc **old, struct netlink_ext_ack *extack) 1177 { 1178 struct hfsc_class *cl = (struct hfsc_class *)arg; 1179 1180 if (cl->level > 0) 1181 return -EINVAL; 1182 if (new == NULL) { 1183 new = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, 1184 cl->cl_common.classid, NULL); 1185 if (new == NULL) 1186 new = &noop_qdisc; 1187 } 1188 1189 *old = qdisc_replace(sch, new, &cl->qdisc); 1190 return 0; 1191 } 1192 1193 static struct Qdisc * 1194 hfsc_class_leaf(struct Qdisc *sch, unsigned long arg) 1195 { 1196 struct hfsc_class *cl = (struct hfsc_class *)arg; 1197 1198 if (cl->level == 0) 1199 return cl->qdisc; 1200 1201 return NULL; 1202 } 1203 1204 static void 1205 hfsc_qlen_notify(struct Qdisc *sch, unsigned long arg) 1206 { 1207 struct hfsc_class *cl = (struct hfsc_class *)arg; 1208 1209 /* vttree is now handled in update_vf() so that update_vf(cl, 0, 0) 1210 * needs to be called explicitly to remove a class from vttree. 1211 */ 1212 update_vf(cl, 0, 0); 1213 if (cl->cl_flags & HFSC_RSC) 1214 eltree_remove(cl); 1215 } 1216 1217 static unsigned long 1218 hfsc_search_class(struct Qdisc *sch, u32 classid) 1219 { 1220 return (unsigned long)hfsc_find_class(classid, sch); 1221 } 1222 1223 static unsigned long 1224 hfsc_bind_tcf(struct Qdisc *sch, unsigned long parent, u32 classid) 1225 { 1226 struct hfsc_class *p = (struct hfsc_class *)parent; 1227 struct hfsc_class *cl = hfsc_find_class(classid, sch); 1228 1229 if (cl != NULL) { 1230 if (p != NULL && p->level <= cl->level) 1231 return 0; 1232 qdisc_class_get(&cl->cl_common); 1233 } 1234 1235 return (unsigned long)cl; 1236 } 1237 1238 static void 1239 hfsc_unbind_tcf(struct Qdisc *sch, unsigned long arg) 1240 { 1241 struct hfsc_class *cl = (struct hfsc_class *)arg; 1242 1243 qdisc_class_put(&cl->cl_common); 1244 } 1245 1246 static struct tcf_block *hfsc_tcf_block(struct Qdisc *sch, unsigned long arg, 1247 struct netlink_ext_ack *extack) 1248 { 1249 struct hfsc_sched *q = qdisc_priv(sch); 1250 struct hfsc_class *cl = (struct hfsc_class *)arg; 1251 1252 if (cl == NULL) 1253 cl = &q->root; 1254 1255 return cl->block; 1256 } 1257 1258 static int 1259 hfsc_dump_sc(struct sk_buff *skb, int attr, struct internal_sc *sc) 1260 { 1261 struct tc_service_curve tsc; 1262 1263 tsc.m1 = sm2m(sc->sm1); 1264 tsc.d = dx2d(sc->dx); 1265 tsc.m2 = sm2m(sc->sm2); 1266 if (nla_put(skb, attr, sizeof(tsc), &tsc)) 1267 goto nla_put_failure; 1268 1269 return skb->len; 1270 1271 nla_put_failure: 1272 return -1; 1273 } 1274 1275 static int 1276 hfsc_dump_curves(struct sk_buff *skb, struct hfsc_class *cl) 1277 { 1278 if ((cl->cl_flags & HFSC_RSC) && 1279 (hfsc_dump_sc(skb, TCA_HFSC_RSC, &cl->cl_rsc) < 0)) 1280 goto nla_put_failure; 1281 1282 if ((cl->cl_flags & HFSC_FSC) && 1283 (hfsc_dump_sc(skb, TCA_HFSC_FSC, &cl->cl_fsc) < 0)) 1284 goto nla_put_failure; 1285 1286 if ((cl->cl_flags & HFSC_USC) && 1287 (hfsc_dump_sc(skb, TCA_HFSC_USC, &cl->cl_usc) < 0)) 1288 goto nla_put_failure; 1289 1290 return skb->len; 1291 1292 nla_put_failure: 1293 return -1; 1294 } 1295 1296 static int 1297 hfsc_dump_class(struct Qdisc *sch, unsigned long arg, struct sk_buff *skb, 1298 struct tcmsg *tcm) 1299 { 1300 struct hfsc_class *cl = (struct hfsc_class *)arg; 1301 struct nlattr *nest; 1302 1303 tcm->tcm_parent = cl->cl_parent ? cl->cl_parent->cl_common.classid : 1304 TC_H_ROOT; 1305 tcm->tcm_handle = cl->cl_common.classid; 1306 if (cl->level == 0) 1307 tcm->tcm_info = cl->qdisc->handle; 1308 1309 nest = nla_nest_start_noflag(skb, TCA_OPTIONS); 1310 if (nest == NULL) 1311 goto nla_put_failure; 1312 if (hfsc_dump_curves(skb, cl) < 0) 1313 goto nla_put_failure; 1314 return nla_nest_end(skb, nest); 1315 1316 nla_put_failure: 1317 nla_nest_cancel(skb, nest); 1318 return -EMSGSIZE; 1319 } 1320 1321 static int 1322 hfsc_dump_class_stats(struct Qdisc *sch, unsigned long arg, 1323 struct gnet_dump *d) 1324 { 1325 struct hfsc_class *cl = (struct hfsc_class *)arg; 1326 struct tc_hfsc_stats xstats; 1327 __u32 qlen; 1328 1329 qdisc_qstats_qlen_backlog(cl->qdisc, &qlen, &cl->qstats.backlog); 1330 xstats.level = cl->level; 1331 xstats.period = cl->cl_vtperiod; 1332 xstats.work = cl->cl_total; 1333 xstats.rtwork = cl->cl_cumul; 1334 1335 if (gnet_stats_copy_basic(d, NULL, &cl->bstats, true) < 0 || 1336 gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 || 1337 gnet_stats_copy_queue(d, NULL, &cl->qstats, qlen) < 0) 1338 return -1; 1339 1340 return gnet_stats_copy_app(d, &xstats, sizeof(xstats)); 1341 } 1342 1343 1344 1345 static void 1346 hfsc_walk(struct Qdisc *sch, struct qdisc_walker *arg) 1347 { 1348 struct hfsc_sched *q = qdisc_priv(sch); 1349 struct hfsc_class *cl; 1350 unsigned int i; 1351 1352 if (arg->stop) 1353 return; 1354 1355 for (i = 0; i < q->clhash.hashsize; i++) { 1356 hlist_for_each_entry(cl, &q->clhash.hash[i], 1357 cl_common.hnode) { 1358 if (!tc_qdisc_stats_dump(sch, (unsigned long)cl, arg)) 1359 return; 1360 } 1361 } 1362 } 1363 1364 static void 1365 hfsc_schedule_watchdog(struct Qdisc *sch) 1366 { 1367 struct hfsc_sched *q = qdisc_priv(sch); 1368 struct hfsc_class *cl; 1369 u64 next_time = 0; 1370 1371 cl = eltree_get_minel(q); 1372 if (cl) 1373 next_time = cl->cl_e; 1374 if (q->root.cl_cfmin != 0) { 1375 if (next_time == 0 || next_time > q->root.cl_cfmin) 1376 next_time = q->root.cl_cfmin; 1377 } 1378 if (next_time) 1379 qdisc_watchdog_schedule(&q->watchdog, next_time); 1380 } 1381 1382 static int 1383 hfsc_init_qdisc(struct Qdisc *sch, struct nlattr *opt, 1384 struct netlink_ext_ack *extack) 1385 { 1386 struct hfsc_sched *q = qdisc_priv(sch); 1387 struct tc_hfsc_qopt *qopt; 1388 int err; 1389 1390 qdisc_watchdog_init(&q->watchdog, sch); 1391 1392 if (!opt || nla_len(opt) < sizeof(*qopt)) 1393 return -EINVAL; 1394 qopt = nla_data(opt); 1395 1396 q->defcls = qopt->defcls; 1397 err = qdisc_class_hash_init(&q->clhash); 1398 if (err < 0) 1399 return err; 1400 q->eligible = RB_ROOT; 1401 1402 err = tcf_block_get(&q->root.block, &q->root.filter_list, sch, extack); 1403 if (err) 1404 return err; 1405 1406 gnet_stats_basic_sync_init(&q->root.bstats); 1407 q->root.cl_common.classid = sch->handle; 1408 q->root.sched = q; 1409 q->root.qdisc = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, 1410 sch->handle, NULL); 1411 if (q->root.qdisc == NULL) 1412 q->root.qdisc = &noop_qdisc; 1413 else 1414 qdisc_hash_add(q->root.qdisc, true); 1415 INIT_LIST_HEAD(&q->root.children); 1416 q->root.vt_tree = RB_ROOT; 1417 q->root.cf_tree = RB_ROOT; 1418 1419 qdisc_class_hash_insert(&q->clhash, &q->root.cl_common); 1420 qdisc_class_hash_grow(sch, &q->clhash); 1421 1422 return 0; 1423 } 1424 1425 static int 1426 hfsc_change_qdisc(struct Qdisc *sch, struct nlattr *opt, 1427 struct netlink_ext_ack *extack) 1428 { 1429 struct hfsc_sched *q = qdisc_priv(sch); 1430 struct tc_hfsc_qopt *qopt; 1431 1432 if (nla_len(opt) < sizeof(*qopt)) 1433 return -EINVAL; 1434 qopt = nla_data(opt); 1435 1436 sch_tree_lock(sch); 1437 q->defcls = qopt->defcls; 1438 sch_tree_unlock(sch); 1439 1440 return 0; 1441 } 1442 1443 static void 1444 hfsc_reset_class(struct hfsc_class *cl) 1445 { 1446 cl->cl_total = 0; 1447 cl->cl_cumul = 0; 1448 cl->cl_d = 0; 1449 cl->cl_e = 0; 1450 cl->cl_vt = 0; 1451 cl->cl_vtadj = 0; 1452 cl->cl_cvtmin = 0; 1453 cl->cl_cvtoff = 0; 1454 cl->cl_vtperiod = 0; 1455 cl->cl_parentperiod = 0; 1456 cl->cl_f = 0; 1457 cl->cl_myf = 0; 1458 cl->cl_cfmin = 0; 1459 cl->cl_nactive = 0; 1460 1461 cl->vt_tree = RB_ROOT; 1462 cl->cf_tree = RB_ROOT; 1463 qdisc_reset(cl->qdisc); 1464 1465 if (cl->cl_flags & HFSC_RSC) 1466 rtsc_init(&cl->cl_deadline, &cl->cl_rsc, 0, 0); 1467 if (cl->cl_flags & HFSC_FSC) 1468 rtsc_init(&cl->cl_virtual, &cl->cl_fsc, 0, 0); 1469 if (cl->cl_flags & HFSC_USC) 1470 rtsc_init(&cl->cl_ulimit, &cl->cl_usc, 0, 0); 1471 } 1472 1473 static void 1474 hfsc_reset_qdisc(struct Qdisc *sch) 1475 { 1476 struct hfsc_sched *q = qdisc_priv(sch); 1477 struct hfsc_class *cl; 1478 unsigned int i; 1479 1480 for (i = 0; i < q->clhash.hashsize; i++) { 1481 hlist_for_each_entry(cl, &q->clhash.hash[i], cl_common.hnode) 1482 hfsc_reset_class(cl); 1483 } 1484 q->eligible = RB_ROOT; 1485 qdisc_watchdog_cancel(&q->watchdog); 1486 } 1487 1488 static void 1489 hfsc_destroy_qdisc(struct Qdisc *sch) 1490 { 1491 struct hfsc_sched *q = qdisc_priv(sch); 1492 struct hlist_node *next; 1493 struct hfsc_class *cl; 1494 unsigned int i; 1495 1496 for (i = 0; i < q->clhash.hashsize; i++) { 1497 hlist_for_each_entry(cl, &q->clhash.hash[i], cl_common.hnode) { 1498 tcf_block_put(cl->block); 1499 cl->block = NULL; 1500 } 1501 } 1502 for (i = 0; i < q->clhash.hashsize; i++) { 1503 hlist_for_each_entry_safe(cl, next, &q->clhash.hash[i], 1504 cl_common.hnode) 1505 hfsc_destroy_class(sch, cl); 1506 } 1507 qdisc_class_hash_destroy(&q->clhash); 1508 qdisc_watchdog_cancel(&q->watchdog); 1509 } 1510 1511 static int 1512 hfsc_dump_qdisc(struct Qdisc *sch, struct sk_buff *skb) 1513 { 1514 struct hfsc_sched *q = qdisc_priv(sch); 1515 unsigned char *b = skb_tail_pointer(skb); 1516 struct tc_hfsc_qopt qopt; 1517 1518 qopt.defcls = q->defcls; 1519 if (nla_put(skb, TCA_OPTIONS, sizeof(qopt), &qopt)) 1520 goto nla_put_failure; 1521 return skb->len; 1522 1523 nla_put_failure: 1524 nlmsg_trim(skb, b); 1525 return -1; 1526 } 1527 1528 static int 1529 hfsc_enqueue(struct sk_buff *skb, struct Qdisc *sch, struct sk_buff **to_free) 1530 { 1531 unsigned int len = qdisc_pkt_len(skb); 1532 struct hfsc_class *cl; 1533 int err; 1534 bool first; 1535 1536 cl = hfsc_classify(skb, sch, &err); 1537 if (cl == NULL) { 1538 if (err & __NET_XMIT_BYPASS) 1539 qdisc_qstats_drop(sch); 1540 __qdisc_drop(skb, to_free); 1541 return err; 1542 } 1543 1544 first = !cl->qdisc->q.qlen; 1545 err = qdisc_enqueue(skb, cl->qdisc, to_free); 1546 if (unlikely(err != NET_XMIT_SUCCESS)) { 1547 if (net_xmit_drop_count(err)) { 1548 cl->qstats.drops++; 1549 qdisc_qstats_drop(sch); 1550 } 1551 return err; 1552 } 1553 1554 if (first) { 1555 if (cl->cl_flags & HFSC_RSC) 1556 init_ed(cl, len); 1557 if (cl->cl_flags & HFSC_FSC) 1558 init_vf(cl, len); 1559 /* 1560 * If this is the first packet, isolate the head so an eventual 1561 * head drop before the first dequeue operation has no chance 1562 * to invalidate the deadline. 1563 */ 1564 if (cl->cl_flags & HFSC_RSC) 1565 cl->qdisc->ops->peek(cl->qdisc); 1566 1567 } 1568 1569 sch->qstats.backlog += len; 1570 sch->q.qlen++; 1571 1572 return NET_XMIT_SUCCESS; 1573 } 1574 1575 static struct sk_buff * 1576 hfsc_dequeue(struct Qdisc *sch) 1577 { 1578 struct hfsc_sched *q = qdisc_priv(sch); 1579 struct hfsc_class *cl; 1580 struct sk_buff *skb; 1581 u64 cur_time; 1582 unsigned int next_len; 1583 int realtime = 0; 1584 1585 if (sch->q.qlen == 0) 1586 return NULL; 1587 1588 cur_time = psched_get_time(); 1589 1590 /* 1591 * if there are eligible classes, use real-time criteria. 1592 * find the class with the minimum deadline among 1593 * the eligible classes. 1594 */ 1595 cl = eltree_get_mindl(q, cur_time); 1596 if (cl) { 1597 realtime = 1; 1598 } else { 1599 /* 1600 * use link-sharing criteria 1601 * get the class with the minimum vt in the hierarchy 1602 */ 1603 cl = vttree_get_minvt(&q->root, cur_time); 1604 if (cl == NULL) { 1605 qdisc_qstats_overlimit(sch); 1606 hfsc_schedule_watchdog(sch); 1607 return NULL; 1608 } 1609 } 1610 1611 skb = qdisc_dequeue_peeked(cl->qdisc); 1612 if (skb == NULL) { 1613 qdisc_warn_nonwc("HFSC", cl->qdisc); 1614 return NULL; 1615 } 1616 1617 bstats_update(&cl->bstats, skb); 1618 update_vf(cl, qdisc_pkt_len(skb), cur_time); 1619 if (realtime) 1620 cl->cl_cumul += qdisc_pkt_len(skb); 1621 1622 if (cl->cl_flags & HFSC_RSC) { 1623 if (cl->qdisc->q.qlen != 0) { 1624 /* update ed */ 1625 next_len = qdisc_peek_len(cl->qdisc); 1626 if (realtime) 1627 update_ed(cl, next_len); 1628 else 1629 update_d(cl, next_len); 1630 } else { 1631 /* the class becomes passive */ 1632 eltree_remove(cl); 1633 } 1634 } 1635 1636 qdisc_bstats_update(sch, skb); 1637 qdisc_qstats_backlog_dec(sch, skb); 1638 sch->q.qlen--; 1639 1640 return skb; 1641 } 1642 1643 static const struct Qdisc_class_ops hfsc_class_ops = { 1644 .change = hfsc_change_class, 1645 .delete = hfsc_delete_class, 1646 .graft = hfsc_graft_class, 1647 .leaf = hfsc_class_leaf, 1648 .qlen_notify = hfsc_qlen_notify, 1649 .find = hfsc_search_class, 1650 .bind_tcf = hfsc_bind_tcf, 1651 .unbind_tcf = hfsc_unbind_tcf, 1652 .tcf_block = hfsc_tcf_block, 1653 .dump = hfsc_dump_class, 1654 .dump_stats = hfsc_dump_class_stats, 1655 .walk = hfsc_walk 1656 }; 1657 1658 static struct Qdisc_ops hfsc_qdisc_ops __read_mostly = { 1659 .id = "hfsc", 1660 .init = hfsc_init_qdisc, 1661 .change = hfsc_change_qdisc, 1662 .reset = hfsc_reset_qdisc, 1663 .destroy = hfsc_destroy_qdisc, 1664 .dump = hfsc_dump_qdisc, 1665 .enqueue = hfsc_enqueue, 1666 .dequeue = hfsc_dequeue, 1667 .peek = qdisc_peek_dequeued, 1668 .cl_ops = &hfsc_class_ops, 1669 .priv_size = sizeof(struct hfsc_sched), 1670 .owner = THIS_MODULE 1671 }; 1672 1673 static int __init 1674 hfsc_init(void) 1675 { 1676 return register_qdisc(&hfsc_qdisc_ops); 1677 } 1678 1679 static void __exit 1680 hfsc_cleanup(void) 1681 { 1682 unregister_qdisc(&hfsc_qdisc_ops); 1683 } 1684 1685 MODULE_LICENSE("GPL"); 1686 module_init(hfsc_init); 1687 module_exit(hfsc_cleanup); 1688