| 1 | /* $KAME: altq_cbq.c,v 1.20 2004/04/17 10:54:48 kjc Exp $ */ |
| 2 | /* $DragonFly: src/sys/net/altq/altq_cbq.c,v 1.7 2008/05/14 11:59:23 sephe Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (c) Sun Microsystems, Inc. 1993-1998 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 | * |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * |
| 18 | * 3. All advertising materials mentioning features or use of this software |
| 19 | * must display the following acknowledgement: |
| 20 | * This product includes software developed by the SMCC Technology |
| 21 | * Development Group at Sun Microsystems, Inc. |
| 22 | * |
| 23 | * 4. The name of the Sun Microsystems, Inc nor may not be used to endorse or |
| 24 | * promote products derived from this software without specific prior |
| 25 | * written permission. |
| 26 | * |
| 27 | * SUN MICROSYSTEMS DOES NOT CLAIM MERCHANTABILITY OF THIS SOFTWARE OR THE |
| 28 | * SUITABILITY OF THIS SOFTWARE FOR ANY PARTICULAR PURPOSE. The software is |
| 29 | * provided "as is" without express or implied warranty of any kind. |
| 30 | * |
| 31 | * These notices must be retained in any copies of any part of this software. |
| 32 | */ |
| 33 | |
| 34 | #include "opt_altq.h" |
| 35 | #include "opt_inet.h" |
| 36 | #include "opt_inet6.h" |
| 37 | |
| 38 | #ifdef ALTQ_CBQ /* cbq is enabled by ALTQ_CBQ option in opt_altq.h */ |
| 39 | |
| 40 | #include <sys/param.h> |
| 41 | #include <sys/malloc.h> |
| 42 | #include <sys/mbuf.h> |
| 43 | #include <sys/socket.h> |
| 44 | #include <sys/systm.h> |
| 45 | #include <sys/proc.h> |
| 46 | #include <sys/callout.h> |
| 47 | #include <sys/errno.h> |
| 48 | #include <sys/time.h> |
| 49 | #include <sys/thread.h> |
| 50 | |
| 51 | #include <net/if.h> |
| 52 | #include <net/ifq_var.h> |
| 53 | #include <netinet/in.h> |
| 54 | |
| 55 | #include <net/pf/pfvar.h> |
| 56 | #include <net/altq/altq.h> |
| 57 | #include <net/altq/altq_cbq.h> |
| 58 | |
| 59 | #include <sys/thread2.h> |
| 60 | |
| 61 | #define CBQ_SUBQ_INDEX ALTQ_SUBQ_INDEX_DEFAULT |
| 62 | #define CBQ_LOCK(ifq) \ |
| 63 | ALTQ_SQ_LOCK(&(ifq)->altq_subq[CBQ_SUBQ_INDEX]) |
| 64 | #define CBQ_UNLOCK(ifq) \ |
| 65 | ALTQ_SQ_UNLOCK(&(ifq)->altq_subq[CBQ_SUBQ_INDEX]) |
| 66 | #define CBQ_ASSERT_LOCKED(ifq) \ |
| 67 | ALTQ_SQ_ASSERT_LOCKED(&(ifq)->altq_subq[CBQ_SUBQ_INDEX]) |
| 68 | |
| 69 | /* |
| 70 | * Forward Declarations. |
| 71 | */ |
| 72 | static int cbq_class_destroy(cbq_state_t *, struct rm_class *); |
| 73 | static struct rm_class *clh_to_clp(cbq_state_t *, uint32_t); |
| 74 | static int cbq_clear_interface(cbq_state_t *); |
| 75 | static int cbq_request(struct ifaltq_subque *, int, void *); |
| 76 | static int cbq_enqueue(struct ifaltq_subque *, struct mbuf *, |
| 77 | struct altq_pktattr *); |
| 78 | static struct mbuf *cbq_dequeue(struct ifaltq_subque *, struct mbuf *, |
| 79 | int); |
| 80 | static void cbqrestart(struct ifaltq *); |
| 81 | static void get_class_stats(class_stats_t *, struct rm_class *); |
| 82 | static void cbq_purge(cbq_state_t *); |
| 83 | |
| 84 | /* |
| 85 | * int |
| 86 | * cbq_class_destroy(cbq_mod_state_t *, struct rm_class *) - This |
| 87 | * function destroys a given traffic class. Before destroying |
| 88 | * the class, all traffic for that class is released. |
| 89 | */ |
| 90 | static int |
| 91 | cbq_class_destroy(cbq_state_t *cbqp, struct rm_class *cl) |
| 92 | { |
| 93 | int i; |
| 94 | |
| 95 | /* delete the class */ |
| 96 | rmc_delete_class(&cbqp->ifnp, cl); |
| 97 | |
| 98 | /* |
| 99 | * free the class handle |
| 100 | */ |
| 101 | for (i = 0; i < CBQ_MAX_CLASSES; i++) |
| 102 | if (cbqp->cbq_class_tbl[i] == cl) |
| 103 | cbqp->cbq_class_tbl[i] = NULL; |
| 104 | |
| 105 | if (cl == cbqp->ifnp.root_) |
| 106 | cbqp->ifnp.root_ = NULL; |
| 107 | if (cl == cbqp->ifnp.default_) |
| 108 | cbqp->ifnp.default_ = NULL; |
| 109 | return (0); |
| 110 | } |
| 111 | |
| 112 | /* convert class handle to class pointer */ |
| 113 | static struct rm_class * |
| 114 | clh_to_clp(cbq_state_t *cbqp, uint32_t chandle) |
| 115 | { |
| 116 | int i; |
| 117 | struct rm_class *cl; |
| 118 | |
| 119 | if (chandle == 0) |
| 120 | return (NULL); |
| 121 | /* |
| 122 | * first, try optimistically the slot matching the lower bits of |
| 123 | * the handle. if it fails, do the linear table search. |
| 124 | */ |
| 125 | i = chandle % CBQ_MAX_CLASSES; |
| 126 | if ((cl = cbqp->cbq_class_tbl[i]) != NULL && |
| 127 | cl->stats_.handle == chandle) |
| 128 | return (cl); |
| 129 | for (i = 0; i < CBQ_MAX_CLASSES; i++) |
| 130 | if ((cl = cbqp->cbq_class_tbl[i]) != NULL && |
| 131 | cl->stats_.handle == chandle) |
| 132 | return (cl); |
| 133 | return (NULL); |
| 134 | } |
| 135 | |
| 136 | static int |
| 137 | cbq_clear_interface(cbq_state_t *cbqp) |
| 138 | { |
| 139 | int again, i; |
| 140 | struct rm_class *cl; |
| 141 | |
| 142 | /* clear out the classes now */ |
| 143 | do { |
| 144 | again = 0; |
| 145 | for (i = 0; i < CBQ_MAX_CLASSES; i++) { |
| 146 | if ((cl = cbqp->cbq_class_tbl[i]) != NULL) { |
| 147 | if (is_a_parent_class(cl)) |
| 148 | again++; |
| 149 | else { |
| 150 | cbq_class_destroy(cbqp, cl); |
| 151 | cbqp->cbq_class_tbl[i] = NULL; |
| 152 | if (cl == cbqp->ifnp.root_) |
| 153 | cbqp->ifnp.root_ = NULL; |
| 154 | if (cl == cbqp->ifnp.default_) |
| 155 | cbqp->ifnp.default_ = NULL; |
| 156 | } |
| 157 | } |
| 158 | } |
| 159 | } while (again); |
| 160 | |
| 161 | return (0); |
| 162 | } |
| 163 | |
| 164 | static int |
| 165 | cbq_request(struct ifaltq_subque *ifsq, int req, void *arg) |
| 166 | { |
| 167 | struct ifaltq *ifq = ifsq->ifsq_altq; |
| 168 | cbq_state_t *cbqp = (cbq_state_t *)ifq->altq_disc; |
| 169 | |
| 170 | crit_enter(); |
| 171 | switch (req) { |
| 172 | case ALTRQ_PURGE: |
| 173 | if (ifsq_get_index(ifsq) == CBQ_SUBQ_INDEX) { |
| 174 | cbq_purge(cbqp); |
| 175 | } else { |
| 176 | /* |
| 177 | * Race happened, the unrelated subqueue was |
| 178 | * picked during the packet scheduler transition. |
| 179 | */ |
| 180 | ifsq_classic_request(ifsq, ALTRQ_PURGE, NULL); |
| 181 | } |
| 182 | break; |
| 183 | } |
| 184 | crit_exit(); |
| 185 | return (0); |
| 186 | } |
| 187 | |
| 188 | /* copy the stats info in rm_class to class_states_t */ |
| 189 | static void |
| 190 | get_class_stats(class_stats_t *statsp, struct rm_class *cl) |
| 191 | { |
| 192 | statsp->xmit_cnt = cl->stats_.xmit_cnt; |
| 193 | statsp->drop_cnt = cl->stats_.drop_cnt; |
| 194 | statsp->over = cl->stats_.over; |
| 195 | statsp->borrows = cl->stats_.borrows; |
| 196 | statsp->overactions = cl->stats_.overactions; |
| 197 | statsp->delays = cl->stats_.delays; |
| 198 | |
| 199 | statsp->depth = cl->depth_; |
| 200 | statsp->priority = cl->pri_; |
| 201 | statsp->maxidle = cl->maxidle_; |
| 202 | statsp->minidle = cl->minidle_; |
| 203 | statsp->offtime = cl->offtime_; |
| 204 | statsp->qmax = qlimit(cl->q_); |
| 205 | statsp->ns_per_byte = cl->ns_per_byte_; |
| 206 | statsp->wrr_allot = cl->w_allotment_; |
| 207 | statsp->qcnt = qlen(cl->q_); |
| 208 | statsp->avgidle = cl->avgidle_; |
| 209 | |
| 210 | statsp->qtype = qtype(cl->q_); |
| 211 | #ifdef ALTQ_RED |
| 212 | if (q_is_red(cl->q_)) |
| 213 | red_getstats(cl->red_, &statsp->red[0]); |
| 214 | #endif |
| 215 | #ifdef ALTQ_RIO |
| 216 | if (q_is_rio(cl->q_)) |
| 217 | rio_getstats((rio_t *)cl->red_, &statsp->red[0]); |
| 218 | #endif |
| 219 | } |
| 220 | |
| 221 | int |
| 222 | cbq_pfattach(struct pf_altq *a, struct ifaltq *ifq) |
| 223 | { |
| 224 | return altq_attach(ifq, ALTQT_CBQ, a->altq_disc, ifq_mapsubq_default, |
| 225 | cbq_enqueue, cbq_dequeue, cbq_request, NULL, NULL); |
| 226 | } |
| 227 | |
| 228 | int |
| 229 | cbq_add_altq(struct pf_altq *a) |
| 230 | { |
| 231 | cbq_state_t *cbqp; |
| 232 | struct ifnet *ifp; |
| 233 | |
| 234 | if ((ifp = ifunit(a->ifname)) == NULL) |
| 235 | return (EINVAL); |
| 236 | if (!ifq_is_ready(&ifp->if_snd)) |
| 237 | return (ENODEV); |
| 238 | |
| 239 | /* allocate and initialize cbq_state_t */ |
| 240 | cbqp = kmalloc(sizeof(*cbqp), M_ALTQ, M_WAITOK | M_ZERO); |
| 241 | callout_init(&cbqp->cbq_callout); |
| 242 | cbqp->cbq_qlen = 0; |
| 243 | cbqp->ifnp.ifq_ = &ifp->if_snd; /* keep the ifq */ |
| 244 | ifq_purge_all(&ifp->if_snd); |
| 245 | |
| 246 | /* keep the state in pf_altq */ |
| 247 | a->altq_disc = cbqp; |
| 248 | |
| 249 | return (0); |
| 250 | } |
| 251 | |
| 252 | int |
| 253 | cbq_remove_altq(struct pf_altq *a) |
| 254 | { |
| 255 | cbq_state_t *cbqp; |
| 256 | |
| 257 | if ((cbqp = a->altq_disc) == NULL) |
| 258 | return (EINVAL); |
| 259 | a->altq_disc = NULL; |
| 260 | |
| 261 | cbq_clear_interface(cbqp); |
| 262 | |
| 263 | if (cbqp->ifnp.default_) |
| 264 | cbq_class_destroy(cbqp, cbqp->ifnp.default_); |
| 265 | if (cbqp->ifnp.root_) |
| 266 | cbq_class_destroy(cbqp, cbqp->ifnp.root_); |
| 267 | |
| 268 | /* deallocate cbq_state_t */ |
| 269 | kfree(cbqp, M_ALTQ); |
| 270 | |
| 271 | return (0); |
| 272 | } |
| 273 | |
| 274 | static int |
| 275 | cbq_add_queue_locked(struct pf_altq *a, cbq_state_t *cbqp) |
| 276 | { |
| 277 | struct rm_class *borrow, *parent; |
| 278 | struct rm_class *cl; |
| 279 | struct cbq_opts *opts; |
| 280 | int i; |
| 281 | |
| 282 | KKASSERT(a->qid != 0); |
| 283 | |
| 284 | /* |
| 285 | * find a free slot in the class table. if the slot matching |
| 286 | * the lower bits of qid is free, use this slot. otherwise, |
| 287 | * use the first free slot. |
| 288 | */ |
| 289 | i = a->qid % CBQ_MAX_CLASSES; |
| 290 | if (cbqp->cbq_class_tbl[i] != NULL) { |
| 291 | for (i = 0; i < CBQ_MAX_CLASSES; i++) |
| 292 | if (cbqp->cbq_class_tbl[i] == NULL) |
| 293 | break; |
| 294 | if (i == CBQ_MAX_CLASSES) |
| 295 | return (EINVAL); |
| 296 | } |
| 297 | |
| 298 | opts = &a->pq_u.cbq_opts; |
| 299 | /* check parameters */ |
| 300 | if (a->priority >= CBQ_MAXPRI) |
| 301 | return (EINVAL); |
| 302 | |
| 303 | /* Get pointers to parent and borrow classes. */ |
| 304 | parent = clh_to_clp(cbqp, a->parent_qid); |
| 305 | if (opts->flags & CBQCLF_BORROW) |
| 306 | borrow = parent; |
| 307 | else |
| 308 | borrow = NULL; |
| 309 | |
| 310 | /* |
| 311 | * A class must borrow from it's parent or it can not |
| 312 | * borrow at all. Hence, borrow can be null. |
| 313 | */ |
| 314 | if (parent == NULL && (opts->flags & CBQCLF_ROOTCLASS) == 0) { |
| 315 | kprintf("cbq_add_queue: no parent class!\n"); |
| 316 | return (EINVAL); |
| 317 | } |
| 318 | |
| 319 | if ((borrow != parent) && (borrow != NULL)) { |
| 320 | kprintf("cbq_add_class: borrow class != parent\n"); |
| 321 | return (EINVAL); |
| 322 | } |
| 323 | |
| 324 | /* |
| 325 | * check parameters |
| 326 | */ |
| 327 | switch (opts->flags & CBQCLF_CLASSMASK) { |
| 328 | case CBQCLF_ROOTCLASS: |
| 329 | if (parent != NULL) |
| 330 | return (EINVAL); |
| 331 | if (cbqp->ifnp.root_) |
| 332 | return (EINVAL); |
| 333 | break; |
| 334 | case CBQCLF_DEFCLASS: |
| 335 | if (cbqp->ifnp.default_) |
| 336 | return (EINVAL); |
| 337 | break; |
| 338 | case 0: |
| 339 | if (a->qid == 0) |
| 340 | return (EINVAL); |
| 341 | break; |
| 342 | default: |
| 343 | /* more than two flags bits set */ |
| 344 | return (EINVAL); |
| 345 | } |
| 346 | |
| 347 | /* |
| 348 | * create a class. if this is a root class, initialize the |
| 349 | * interface. |
| 350 | */ |
| 351 | if ((opts->flags & CBQCLF_CLASSMASK) == CBQCLF_ROOTCLASS) { |
| 352 | rmc_init(cbqp->ifnp.ifq_, &cbqp->ifnp, opts->ns_per_byte, |
| 353 | cbqrestart, a->qlimit, RM_MAXQUEUED, |
| 354 | opts->maxidle, opts->minidle, opts->offtime, |
| 355 | opts->flags); |
| 356 | cl = cbqp->ifnp.root_; |
| 357 | } else { |
| 358 | cl = rmc_newclass(a->priority, |
| 359 | &cbqp->ifnp, opts->ns_per_byte, |
| 360 | rmc_delay_action, a->qlimit, parent, borrow, |
| 361 | opts->maxidle, opts->minidle, opts->offtime, |
| 362 | opts->pktsize, opts->flags); |
| 363 | } |
| 364 | if (cl == NULL) |
| 365 | return (ENOMEM); |
| 366 | |
| 367 | /* return handle to user space. */ |
| 368 | cl->stats_.handle = a->qid; |
| 369 | cl->stats_.depth = cl->depth_; |
| 370 | |
| 371 | /* save the allocated class */ |
| 372 | cbqp->cbq_class_tbl[i] = cl; |
| 373 | |
| 374 | if ((opts->flags & CBQCLF_CLASSMASK) == CBQCLF_DEFCLASS) |
| 375 | cbqp->ifnp.default_ = cl; |
| 376 | |
| 377 | return (0); |
| 378 | } |
| 379 | |
| 380 | int |
| 381 | cbq_add_queue(struct pf_altq *a) |
| 382 | { |
| 383 | cbq_state_t *cbqp; |
| 384 | struct ifaltq *ifq; |
| 385 | int error; |
| 386 | |
| 387 | if (a->qid == 0) |
| 388 | return (EINVAL); |
| 389 | |
| 390 | /* XXX not MP safe */ |
| 391 | if ((cbqp = a->altq_disc) == NULL) |
| 392 | return (EINVAL); |
| 393 | ifq = cbqp->ifnp.ifq_; |
| 394 | |
| 395 | CBQ_LOCK(ifq); |
| 396 | error = cbq_add_queue_locked(a, cbqp); |
| 397 | CBQ_UNLOCK(ifq); |
| 398 | |
| 399 | return error; |
| 400 | } |
| 401 | |
| 402 | static int |
| 403 | cbq_remove_queue_locked(struct pf_altq *a, cbq_state_t *cbqp) |
| 404 | { |
| 405 | struct rm_class *cl; |
| 406 | int i; |
| 407 | |
| 408 | if ((cl = clh_to_clp(cbqp, a->qid)) == NULL) |
| 409 | return (EINVAL); |
| 410 | |
| 411 | /* if we are a parent class, then return an error. */ |
| 412 | if (is_a_parent_class(cl)) |
| 413 | return (EINVAL); |
| 414 | |
| 415 | /* delete the class */ |
| 416 | rmc_delete_class(&cbqp->ifnp, cl); |
| 417 | |
| 418 | /* |
| 419 | * free the class handle |
| 420 | */ |
| 421 | for (i = 0; i < CBQ_MAX_CLASSES; i++) |
| 422 | if (cbqp->cbq_class_tbl[i] == cl) { |
| 423 | cbqp->cbq_class_tbl[i] = NULL; |
| 424 | if (cl == cbqp->ifnp.root_) |
| 425 | cbqp->ifnp.root_ = NULL; |
| 426 | if (cl == cbqp->ifnp.default_) |
| 427 | cbqp->ifnp.default_ = NULL; |
| 428 | break; |
| 429 | } |
| 430 | |
| 431 | return (0); |
| 432 | } |
| 433 | |
| 434 | int |
| 435 | cbq_remove_queue(struct pf_altq *a) |
| 436 | { |
| 437 | cbq_state_t *cbqp; |
| 438 | struct ifaltq *ifq; |
| 439 | int error; |
| 440 | |
| 441 | /* XXX not MP safe */ |
| 442 | if ((cbqp = a->altq_disc) == NULL) |
| 443 | return (EINVAL); |
| 444 | ifq = cbqp->ifnp.ifq_; |
| 445 | |
| 446 | CBQ_LOCK(ifq); |
| 447 | error = cbq_remove_queue_locked(a, cbqp); |
| 448 | CBQ_UNLOCK(ifq); |
| 449 | |
| 450 | return error; |
| 451 | } |
| 452 | |
| 453 | int |
| 454 | cbq_getqstats(struct pf_altq *a, void *ubuf, int *nbytes) |
| 455 | { |
| 456 | cbq_state_t *cbqp; |
| 457 | struct rm_class *cl; |
| 458 | class_stats_t stats; |
| 459 | int error = 0; |
| 460 | struct ifaltq *ifq; |
| 461 | |
| 462 | if (*nbytes < sizeof(stats)) |
| 463 | return (EINVAL); |
| 464 | |
| 465 | /* XXX not MP safe */ |
| 466 | if ((cbqp = altq_lookup(a->ifname, ALTQT_CBQ)) == NULL) |
| 467 | return (EBADF); |
| 468 | ifq = cbqp->ifnp.ifq_; |
| 469 | |
| 470 | CBQ_LOCK(ifq); |
| 471 | |
| 472 | if ((cl = clh_to_clp(cbqp, a->qid)) == NULL) { |
| 473 | CBQ_UNLOCK(ifq); |
| 474 | return (EINVAL); |
| 475 | } |
| 476 | |
| 477 | get_class_stats(&stats, cl); |
| 478 | |
| 479 | CBQ_UNLOCK(ifq); |
| 480 | |
| 481 | if ((error = copyout((caddr_t)&stats, ubuf, sizeof(stats))) != 0) |
| 482 | return (error); |
| 483 | *nbytes = sizeof(stats); |
| 484 | return (0); |
| 485 | } |
| 486 | |
| 487 | /* |
| 488 | * int |
| 489 | * cbq_enqueue(struct ifaltq_subqueue *ifq, struct mbuf *m, |
| 490 | * struct altq_pktattr *pattr) |
| 491 | * - Queue data packets. |
| 492 | * |
| 493 | * cbq_enqueue is set to ifp->if_altqenqueue and called by an upper |
| 494 | * layer (e.g. ether_output). cbq_enqueue queues the given packet |
| 495 | * to the cbq, then invokes the driver's start routine. |
| 496 | * |
| 497 | * Returns: 0 if the queueing is successful. |
| 498 | * ENOBUFS if a packet dropping occurred as a result of |
| 499 | * the queueing. |
| 500 | */ |
| 501 | |
| 502 | static int |
| 503 | cbq_enqueue(struct ifaltq_subque *ifsq, struct mbuf *m, |
| 504 | struct altq_pktattr *pktattr __unused) |
| 505 | { |
| 506 | struct ifaltq *ifq = ifsq->ifsq_altq; |
| 507 | cbq_state_t *cbqp = (cbq_state_t *)ifq->altq_disc; |
| 508 | struct rm_class *cl; |
| 509 | int len; |
| 510 | |
| 511 | if (ifsq_get_index(ifsq) != CBQ_SUBQ_INDEX) { |
| 512 | /* |
| 513 | * Race happened, the unrelated subqueue was |
| 514 | * picked during the packet scheduler transition. |
| 515 | */ |
| 516 | ifsq_classic_request(ifsq, ALTRQ_PURGE, NULL); |
| 517 | m_freem(m); |
| 518 | return (ENOBUFS); |
| 519 | } |
| 520 | |
| 521 | /* grab class set by classifier */ |
| 522 | if ((m->m_flags & M_PKTHDR) == 0) { |
| 523 | /* should not happen */ |
| 524 | if_printf(ifq->altq_ifp, "altq: packet does not have pkthdr\n"); |
| 525 | m_freem(m); |
| 526 | return (ENOBUFS); |
| 527 | } |
| 528 | if (m->m_pkthdr.fw_flags & PF_MBUF_STRUCTURE) |
| 529 | cl = clh_to_clp(cbqp, m->m_pkthdr.pf.qid); |
| 530 | else |
| 531 | cl = NULL; |
| 532 | if (cl == NULL) { |
| 533 | cl = cbqp->ifnp.default_; |
| 534 | if (cl == NULL) { |
| 535 | m_freem(m); |
| 536 | return (ENOBUFS); |
| 537 | } |
| 538 | } |
| 539 | crit_enter(); |
| 540 | cl->pktattr_ = NULL; |
| 541 | len = m_pktlen(m); |
| 542 | if (rmc_queue_packet(cl, m) != 0) { |
| 543 | /* drop occurred. some mbuf was freed in rmc_queue_packet. */ |
| 544 | PKTCNTR_ADD(&cl->stats_.drop_cnt, len); |
| 545 | crit_exit(); |
| 546 | return (ENOBUFS); |
| 547 | } |
| 548 | |
| 549 | /* successfully queued. */ |
| 550 | ++cbqp->cbq_qlen; |
| 551 | ++ifsq->ifq_len; |
| 552 | crit_exit(); |
| 553 | return (0); |
| 554 | } |
| 555 | |
| 556 | static struct mbuf * |
| 557 | cbq_dequeue(struct ifaltq_subque *ifsq, struct mbuf *mpolled, int op) |
| 558 | { |
| 559 | struct ifaltq *ifq = ifsq->ifsq_altq; |
| 560 | cbq_state_t *cbqp = (cbq_state_t *)ifq->altq_disc; |
| 561 | struct mbuf *m; |
| 562 | |
| 563 | if (ifsq_get_index(ifsq) != CBQ_SUBQ_INDEX) { |
| 564 | /* |
| 565 | * Race happened, the unrelated subqueue was |
| 566 | * picked during the packet scheduler transition. |
| 567 | */ |
| 568 | ifsq_classic_request(ifsq, ALTRQ_PURGE, NULL); |
| 569 | return NULL; |
| 570 | } |
| 571 | |
| 572 | crit_enter(); |
| 573 | m = rmc_dequeue_next(&cbqp->ifnp, op); |
| 574 | |
| 575 | if (m && op == ALTDQ_REMOVE) { |
| 576 | --cbqp->cbq_qlen; /* decrement # of packets in cbq */ |
| 577 | --ifsq->ifq_len; |
| 578 | |
| 579 | /* Update the class. */ |
| 580 | rmc_update_class_util(&cbqp->ifnp); |
| 581 | } |
| 582 | crit_exit(); |
| 583 | KKASSERT(mpolled == NULL || mpolled == m); |
| 584 | return (m); |
| 585 | } |
| 586 | |
| 587 | /* |
| 588 | * void |
| 589 | * cbqrestart(queue_t *) - Restart sending of data. |
| 590 | * called from rmc_restart in a critical section via timeout after waking up |
| 591 | * a suspended class. |
| 592 | * Returns: NONE |
| 593 | */ |
| 594 | |
| 595 | static void |
| 596 | cbqrestart(struct ifaltq *ifq) |
| 597 | { |
| 598 | cbq_state_t *cbqp; |
| 599 | |
| 600 | CBQ_ASSERT_LOCKED(ifq); |
| 601 | |
| 602 | if (!ifq_is_enabled(ifq)) |
| 603 | /* cbq must have been detached */ |
| 604 | return; |
| 605 | |
| 606 | if ((cbqp = (cbq_state_t *)ifq->altq_disc) == NULL) |
| 607 | /* should not happen */ |
| 608 | return; |
| 609 | |
| 610 | if (cbqp->cbq_qlen > 0) { |
| 611 | struct ifnet *ifp = ifq->altq_ifp; |
| 612 | struct ifaltq_subque *ifsq = &ifq->altq_subq[CBQ_SUBQ_INDEX]; |
| 613 | |
| 614 | /* Release the altq lock to avoid deadlock */ |
| 615 | CBQ_UNLOCK(ifq); |
| 616 | |
| 617 | ifnet_serialize_tx(ifp, ifsq); |
| 618 | if (ifp->if_start && !ifsq_is_oactive(ifsq)) |
| 619 | (*ifp->if_start)(ifp, ifsq); |
| 620 | ifnet_deserialize_tx(ifp, ifsq); |
| 621 | |
| 622 | CBQ_LOCK(ifq); |
| 623 | } |
| 624 | } |
| 625 | |
| 626 | static void |
| 627 | cbq_purge(cbq_state_t *cbqp) |
| 628 | { |
| 629 | struct rm_class *cl; |
| 630 | int i; |
| 631 | for (i = 0; i < CBQ_MAX_CLASSES; i++) { |
| 632 | if ((cl = cbqp->cbq_class_tbl[i]) != NULL) |
| 633 | rmc_dropall(cl); |
| 634 | } |
| 635 | if (ifq_is_enabled(cbqp->ifnp.ifq_)) |
| 636 | cbqp->ifnp.ifq_->altq_subq[CBQ_SUBQ_INDEX].ifq_len = 0; |
| 637 | } |
| 638 | |
| 639 | #endif /* ALTQ_CBQ */ |