1 /*- 2 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 #include "opt_wlan.h" 30 31 #ifdef IEEE80211_SUPPORT_SUPERG 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/mbuf.h> 36 #include <sys/kernel.h> 37 #include <sys/endian.h> 38 39 #include <sys/socket.h> 40 41 #include <net/bpf.h> 42 #include <net/ethernet.h> 43 #include <net/if.h> 44 #include <net/if_llc.h> 45 #include <net/if_media.h> 46 47 #include <net80211/ieee80211_var.h> 48 #include <net80211/ieee80211_input.h> 49 #include <net80211/ieee80211_phy.h> 50 #include <net80211/ieee80211_superg.h> 51 52 /* 53 * Atheros fast-frame encapsulation format. 54 * FF max payload: 55 * 802.2 + FFHDR + HPAD + 802.3 + 802.2 + 1500 + SPAD + 802.3 + 802.2 + 1500: 56 * 8 + 4 + 4 + 14 + 8 + 1500 + 6 + 14 + 8 + 1500 57 * = 3066 58 */ 59 /* fast frame header is 32-bits */ 60 #define ATH_FF_PROTO 0x0000003f /* protocol */ 61 #define ATH_FF_PROTO_S 0 62 #define ATH_FF_FTYPE 0x000000c0 /* frame type */ 63 #define ATH_FF_FTYPE_S 6 64 #define ATH_FF_HLEN32 0x00000300 /* optional hdr length */ 65 #define ATH_FF_HLEN32_S 8 66 #define ATH_FF_SEQNUM 0x001ffc00 /* sequence number */ 67 #define ATH_FF_SEQNUM_S 10 68 #define ATH_FF_OFFSET 0xffe00000 /* offset to 2nd payload */ 69 #define ATH_FF_OFFSET_S 21 70 71 #define ATH_FF_MAX_HDR_PAD 4 72 #define ATH_FF_MAX_SEP_PAD 6 73 #define ATH_FF_MAX_HDR 30 74 75 #define ATH_FF_PROTO_L2TUNNEL 0 /* L2 tunnel protocol */ 76 #define ATH_FF_ETH_TYPE 0x88bd /* Ether type for encapsulated frames */ 77 #define ATH_FF_SNAP_ORGCODE_0 0x00 78 #define ATH_FF_SNAP_ORGCODE_1 0x03 79 #define ATH_FF_SNAP_ORGCODE_2 0x7f 80 81 #define ATH_FF_TXQMIN 2 /* min txq depth for staging */ 82 #define ATH_FF_TXQMAX 50 /* maximum # of queued frames allowed */ 83 #define ATH_FF_STAGEMAX 5 /* max waiting period for staged frame*/ 84 85 #define ETHER_HEADER_COPY(dst, src) \ 86 memcpy(dst, src, sizeof(struct ether_header)) 87 88 static int ieee80211_ffppsmin = 2; /* pps threshold for ff aggregation */ 89 SYSCTL_INT(_net_wlan, OID_AUTO, ffppsmin, CTLTYPE_INT | CTLFLAG_RW, 90 &ieee80211_ffppsmin, 0, "min packet rate before fast-frame staging"); 91 static int ieee80211_ffagemax = -1; /* max time frames held on stage q */ 92 SYSCTL_PROC(_net_wlan, OID_AUTO, ffagemax, CTLTYPE_INT | CTLFLAG_RW, 93 &ieee80211_ffagemax, 0, ieee80211_sysctl_msecs_ticks, "I", 94 "max hold time for fast-frame staging (ms)"); 95 96 void 97 ieee80211_superg_attach(struct ieee80211com *ic) 98 { 99 struct ieee80211_superg *sg; 100 101 if (ic->ic_caps & IEEE80211_C_FF) { 102 sg = (struct ieee80211_superg *) malloc( 103 sizeof(struct ieee80211_superg), M_80211_VAP, 104 M_NOWAIT | M_ZERO); 105 if (sg == NULL) { 106 printf("%s: cannot allocate SuperG state block\n", 107 __func__); 108 return; 109 } 110 ic->ic_superg = sg; 111 } 112 ieee80211_ffagemax = msecs_to_ticks(150); 113 } 114 115 void 116 ieee80211_superg_detach(struct ieee80211com *ic) 117 { 118 if (ic->ic_superg != NULL) { 119 free(ic->ic_superg, M_80211_VAP); 120 ic->ic_superg = NULL; 121 } 122 } 123 124 void 125 ieee80211_superg_vattach(struct ieee80211vap *vap) 126 { 127 struct ieee80211com *ic = vap->iv_ic; 128 129 if (ic->ic_superg == NULL) /* NB: can't do fast-frames w/o state */ 130 vap->iv_caps &= ~IEEE80211_C_FF; 131 if (vap->iv_caps & IEEE80211_C_FF) 132 vap->iv_flags |= IEEE80211_F_FF; 133 /* NB: we only implement sta mode */ 134 if (vap->iv_opmode == IEEE80211_M_STA && 135 (vap->iv_caps & IEEE80211_C_TURBOP)) 136 vap->iv_flags |= IEEE80211_F_TURBOP; 137 } 138 139 void 140 ieee80211_superg_vdetach(struct ieee80211vap *vap) 141 { 142 } 143 144 #define ATH_OUI_BYTES 0x00, 0x03, 0x7f 145 /* 146 * Add a WME information element to a frame. 147 */ 148 uint8_t * 149 ieee80211_add_ath(uint8_t *frm, uint8_t caps, ieee80211_keyix defkeyix) 150 { 151 static const struct ieee80211_ath_ie info = { 152 .ath_id = IEEE80211_ELEMID_VENDOR, 153 .ath_len = sizeof(struct ieee80211_ath_ie) - 2, 154 .ath_oui = { ATH_OUI_BYTES }, 155 .ath_oui_type = ATH_OUI_TYPE, 156 .ath_oui_subtype= ATH_OUI_SUBTYPE, 157 .ath_version = ATH_OUI_VERSION, 158 }; 159 struct ieee80211_ath_ie *ath = (struct ieee80211_ath_ie *) frm; 160 161 memcpy(frm, &info, sizeof(info)); 162 ath->ath_capability = caps; 163 if (defkeyix != IEEE80211_KEYIX_NONE) { 164 ath->ath_defkeyix[0] = (defkeyix & 0xff); 165 ath->ath_defkeyix[1] = ((defkeyix >> 8) & 0xff); 166 } else { 167 ath->ath_defkeyix[0] = 0xff; 168 ath->ath_defkeyix[1] = 0x7f; 169 } 170 return frm + sizeof(info); 171 } 172 #undef ATH_OUI_BYTES 173 174 uint8_t * 175 ieee80211_add_athcaps(uint8_t *frm, const struct ieee80211_node *bss) 176 { 177 const struct ieee80211vap *vap = bss->ni_vap; 178 179 return ieee80211_add_ath(frm, 180 vap->iv_flags & IEEE80211_F_ATHEROS, 181 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 182 bss->ni_authmode != IEEE80211_AUTH_8021X) ? 183 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 184 } 185 186 void 187 ieee80211_parse_ath(struct ieee80211_node *ni, uint8_t *ie) 188 { 189 const struct ieee80211_ath_ie *ath = 190 (const struct ieee80211_ath_ie *) ie; 191 192 ni->ni_ath_flags = ath->ath_capability; 193 ni->ni_ath_defkeyix = LE_READ_2(&ath->ath_defkeyix); 194 } 195 196 int 197 ieee80211_parse_athparams(struct ieee80211_node *ni, uint8_t *frm, 198 const struct ieee80211_frame *wh) 199 { 200 struct ieee80211vap *vap = ni->ni_vap; 201 const struct ieee80211_ath_ie *ath; 202 u_int len = frm[1]; 203 int capschanged; 204 uint16_t defkeyix; 205 206 if (len < sizeof(struct ieee80211_ath_ie)-2) { 207 IEEE80211_DISCARD_IE(vap, 208 IEEE80211_MSG_ELEMID | IEEE80211_MSG_SUPERG, 209 wh, "Atheros", "too short, len %u", len); 210 return -1; 211 } 212 ath = (const struct ieee80211_ath_ie *)frm; 213 capschanged = (ni->ni_ath_flags != ath->ath_capability); 214 defkeyix = LE_READ_2(ath->ath_defkeyix); 215 if (capschanged || defkeyix != ni->ni_ath_defkeyix) { 216 ni->ni_ath_flags = ath->ath_capability; 217 ni->ni_ath_defkeyix = defkeyix; 218 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 219 "ath ie change: new caps 0x%x defkeyix 0x%x", 220 ni->ni_ath_flags, ni->ni_ath_defkeyix); 221 } 222 if (IEEE80211_ATH_CAP(vap, ni, ATHEROS_CAP_TURBO_PRIME)) { 223 uint16_t curflags, newflags; 224 225 /* 226 * Check for turbo mode switch. Calculate flags 227 * for the new mode and effect the switch. 228 */ 229 newflags = curflags = vap->iv_ic->ic_bsschan->ic_flags; 230 /* NB: BOOST is not in ic_flags, so get it from the ie */ 231 if (ath->ath_capability & ATHEROS_CAP_BOOST) 232 newflags |= IEEE80211_CHAN_TURBO; 233 else 234 newflags &= ~IEEE80211_CHAN_TURBO; 235 if (newflags != curflags) 236 ieee80211_dturbo_switch(vap, newflags); 237 } 238 return capschanged; 239 } 240 241 /* 242 * Decap the encapsulated frame pair and dispatch the first 243 * for delivery. The second frame is returned for delivery 244 * via the normal path. 245 */ 246 struct mbuf * 247 ieee80211_ff_decap(struct ieee80211_node *ni, struct mbuf *m) 248 { 249 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 250 #define MS(x,f) (((x) & f) >> f##_S) 251 struct ieee80211vap *vap = ni->ni_vap; 252 struct llc *llc; 253 uint32_t ath; 254 struct mbuf *n; 255 int framelen; 256 257 /* NB: we assume caller does this check for us */ 258 KASSERT(IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF), 259 ("ff not negotiated")); 260 /* 261 * Check for fast-frame tunnel encapsulation. 262 */ 263 if (m->m_pkthdr.len < 3*FF_LLC_SIZE) 264 return m; 265 if (m->m_len < FF_LLC_SIZE && 266 (m = m_pullup(m, FF_LLC_SIZE)) == NULL) { 267 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 268 ni->ni_macaddr, "fast-frame", 269 "%s", "m_pullup(llc) failed"); 270 vap->iv_stats.is_rx_tooshort++; 271 return NULL; 272 } 273 llc = (struct llc *)(mtod(m, uint8_t *) + 274 sizeof(struct ether_header)); 275 if (llc->llc_snap.ether_type != htons(ATH_FF_ETH_TYPE)) 276 return m; 277 m_adj(m, FF_LLC_SIZE); 278 m_copydata(m, 0, sizeof(uint32_t), (caddr_t) &ath); 279 if (MS(ath, ATH_FF_PROTO) != ATH_FF_PROTO_L2TUNNEL) { 280 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 281 ni->ni_macaddr, "fast-frame", 282 "unsupport tunnel protocol, header 0x%x", ath); 283 vap->iv_stats.is_ff_badhdr++; 284 m_freem(m); 285 return NULL; 286 } 287 /* NB: skip header and alignment padding */ 288 m_adj(m, roundup(sizeof(uint32_t) - 2, 4) + 2); 289 290 vap->iv_stats.is_ff_decap++; 291 292 /* 293 * Decap the first frame, bust it apart from the 294 * second and deliver; then decap the second frame 295 * and return it to the caller for normal delivery. 296 */ 297 m = ieee80211_decap1(m, &framelen); 298 if (m == NULL) { 299 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 300 ni->ni_macaddr, "fast-frame", "%s", "first decap failed"); 301 vap->iv_stats.is_ff_tooshort++; 302 return NULL; 303 } 304 n = m_split(m, framelen, M_NOWAIT); 305 if (n == NULL) { 306 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 307 ni->ni_macaddr, "fast-frame", 308 "%s", "unable to split encapsulated frames"); 309 vap->iv_stats.is_ff_split++; 310 m_freem(m); /* NB: must reclaim */ 311 return NULL; 312 } 313 /* XXX not right for WDS */ 314 vap->iv_deliver_data(vap, ni, m); /* 1st of pair */ 315 316 /* 317 * Decap second frame. 318 */ 319 m_adj(n, roundup2(framelen, 4) - framelen); /* padding */ 320 n = ieee80211_decap1(n, &framelen); 321 if (n == NULL) { 322 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 323 ni->ni_macaddr, "fast-frame", "%s", "second decap failed"); 324 vap->iv_stats.is_ff_tooshort++; 325 } 326 /* XXX verify framelen against mbuf contents */ 327 return n; /* 2nd delivered by caller */ 328 #undef MS 329 #undef FF_LLC_SIZE 330 } 331 332 /* 333 * Fast frame encapsulation. There must be two packets 334 * chained with m_nextpkt. We do header adjustment for 335 * each, add the tunnel encapsulation, and then concatenate 336 * the mbuf chains to form a single frame for transmission. 337 */ 338 struct mbuf * 339 ieee80211_ff_encap(struct ieee80211vap *vap, struct mbuf *m1, int hdrspace, 340 struct ieee80211_key *key) 341 { 342 struct mbuf *m2; 343 struct ether_header eh1, eh2; 344 struct llc *llc; 345 struct mbuf *m; 346 int pad; 347 348 m2 = m1->m_nextpkt; 349 if (m2 == NULL) { 350 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 351 "%s: only one frame\n", __func__); 352 goto bad; 353 } 354 m1->m_nextpkt = NULL; 355 /* 356 * Include fast frame headers in adjusting header layout. 357 */ 358 KASSERT(m1->m_len >= sizeof(eh1), ("no ethernet header!")); 359 ETHER_HEADER_COPY(&eh1, mtod(m1, caddr_t)); 360 m1 = ieee80211_mbuf_adjust(vap, 361 hdrspace + sizeof(struct llc) + sizeof(uint32_t) + 2 + 362 sizeof(struct ether_header), 363 key, m1); 364 if (m1 == NULL) { 365 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 366 m_freem(m2); 367 goto bad; 368 } 369 370 /* 371 * Copy second frame's Ethernet header out of line 372 * and adjust for encapsulation headers. Note that 373 * we make room for padding in case there isn't room 374 * at the end of first frame. 375 */ 376 KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!")); 377 ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t)); 378 m2 = ieee80211_mbuf_adjust(vap, 379 ATH_FF_MAX_HDR_PAD + sizeof(struct ether_header), 380 NULL, m2); 381 if (m2 == NULL) { 382 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 383 goto bad; 384 } 385 386 /* 387 * Now do tunnel encapsulation. First, each 388 * frame gets a standard encapsulation. 389 */ 390 m1 = ieee80211_ff_encap1(vap, m1, &eh1); 391 if (m1 == NULL) 392 goto bad; 393 m2 = ieee80211_ff_encap1(vap, m2, &eh2); 394 if (m2 == NULL) 395 goto bad; 396 397 /* 398 * Pad leading frame to a 4-byte boundary. If there 399 * is space at the end of the first frame, put it 400 * there; otherwise prepend to the front of the second 401 * frame. We know doing the second will always work 402 * because we reserve space above. We prefer appending 403 * as this typically has better DMA alignment properties. 404 */ 405 for (m = m1; m->m_next != NULL; m = m->m_next) 406 ; 407 pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len; 408 if (pad) { 409 if (M_TRAILINGSPACE(m) < pad) { /* prepend to second */ 410 m2->m_data -= pad; 411 m2->m_len += pad; 412 m2->m_pkthdr.len += pad; 413 } else { /* append to first */ 414 m->m_len += pad; 415 m1->m_pkthdr.len += pad; 416 } 417 } 418 419 /* 420 * Now, stick 'em together and prepend the tunnel headers; 421 * first the Atheros tunnel header (all zero for now) and 422 * then a special fast frame LLC. 423 * 424 * XXX optimize by prepending together 425 */ 426 m->m_next = m2; /* NB: last mbuf from above */ 427 m1->m_pkthdr.len += m2->m_pkthdr.len; 428 M_PREPEND(m1, sizeof(uint32_t)+2, M_NOWAIT); 429 if (m1 == NULL) { /* XXX cannot happen */ 430 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 431 "%s: no space for tunnel header\n", __func__); 432 vap->iv_stats.is_tx_nobuf++; 433 return NULL; 434 } 435 memset(mtod(m1, void *), 0, sizeof(uint32_t)+2); 436 437 M_PREPEND(m1, sizeof(struct llc), M_NOWAIT); 438 if (m1 == NULL) { /* XXX cannot happen */ 439 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 440 "%s: no space for llc header\n", __func__); 441 vap->iv_stats.is_tx_nobuf++; 442 return NULL; 443 } 444 llc = mtod(m1, struct llc *); 445 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 446 llc->llc_control = LLC_UI; 447 llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0; 448 llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1; 449 llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2; 450 llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE); 451 452 vap->iv_stats.is_ff_encap++; 453 454 return m1; 455 bad: 456 if (m1 != NULL) 457 m_freem(m1); 458 if (m2 != NULL) 459 m_freem(m2); 460 return NULL; 461 } 462 463 static void 464 ff_transmit(struct ieee80211_node *ni, struct mbuf *m) 465 { 466 struct ieee80211vap *vap = ni->ni_vap; 467 struct ieee80211com *ic = ni->ni_ic; 468 int error; 469 470 IEEE80211_TX_LOCK_ASSERT(vap->iv_ic); 471 472 /* encap and xmit */ 473 m = ieee80211_encap(vap, ni, m); 474 if (m != NULL) { 475 struct ifnet *ifp = vap->iv_ifp; 476 477 error = ieee80211_parent_xmitpkt(ic, m);; 478 if (error != 0) { 479 /* NB: IFQ_HANDOFF reclaims mbuf */ 480 ieee80211_free_node(ni); 481 } else { 482 ifp->if_opackets++; 483 } 484 } else 485 ieee80211_free_node(ni); 486 } 487 488 /* 489 * Flush frames to device; note we re-use the linked list 490 * the frames were stored on and use the sentinel (unchanged) 491 * which may be non-NULL. 492 */ 493 static void 494 ff_flush(struct mbuf *head, struct mbuf *last) 495 { 496 struct mbuf *m, *next; 497 struct ieee80211_node *ni; 498 struct ieee80211vap *vap; 499 500 for (m = head; m != last; m = next) { 501 next = m->m_nextpkt; 502 m->m_nextpkt = NULL; 503 504 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif; 505 vap = ni->ni_vap; 506 507 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 508 "%s: flush frame, age %u", __func__, M_AGE_GET(m)); 509 vap->iv_stats.is_ff_flush++; 510 511 ff_transmit(ni, m); 512 } 513 } 514 515 /* 516 * Age frames on the staging queue. 517 * 518 * This is called without the comlock held, but it does all its work 519 * behind the comlock. Because of this, it's possible that the 520 * staging queue will be serviced between the function which called 521 * it and now; thus simply checking that the queue has work in it 522 * may fail. 523 * 524 * See PR kern/174283 for more details. 525 */ 526 void 527 ieee80211_ff_age(struct ieee80211com *ic, struct ieee80211_stageq *sq, 528 int quanta) 529 { 530 struct mbuf *m, *head; 531 struct ieee80211_node *ni; 532 struct ieee80211_tx_ampdu *tap; 533 534 #if 0 535 KASSERT(sq->head != NULL, ("stageq empty")); 536 #endif 537 538 IEEE80211_LOCK(ic); 539 head = sq->head; 540 while ((m = sq->head) != NULL && M_AGE_GET(m) < quanta) { 541 int tid = WME_AC_TO_TID(M_WME_GETAC(m)); 542 543 /* clear tap ref to frame */ 544 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif; 545 tap = &ni->ni_tx_ampdu[tid]; 546 KASSERT(tap->txa_private == m, ("staging queue empty")); 547 tap->txa_private = NULL; 548 549 sq->head = m->m_nextpkt; 550 sq->depth--; 551 } 552 if (m == NULL) 553 sq->tail = NULL; 554 else 555 M_AGE_SUB(m, quanta); 556 IEEE80211_UNLOCK(ic); 557 558 IEEE80211_TX_LOCK(ic); 559 ff_flush(head, m); 560 IEEE80211_TX_UNLOCK(ic); 561 } 562 563 static void 564 stageq_add(struct ieee80211com *ic, struct ieee80211_stageq *sq, struct mbuf *m) 565 { 566 int age = ieee80211_ffagemax; 567 568 IEEE80211_LOCK_ASSERT(ic); 569 570 if (sq->tail != NULL) { 571 sq->tail->m_nextpkt = m; 572 age -= M_AGE_GET(sq->head); 573 } else 574 sq->head = m; 575 KASSERT(age >= 0, ("age %d", age)); 576 M_AGE_SET(m, age); 577 m->m_nextpkt = NULL; 578 sq->tail = m; 579 sq->depth++; 580 } 581 582 static void 583 stageq_remove(struct ieee80211com *ic, struct ieee80211_stageq *sq, struct mbuf *mstaged) 584 { 585 struct mbuf *m, *mprev; 586 587 IEEE80211_LOCK_ASSERT(ic); 588 589 mprev = NULL; 590 for (m = sq->head; m != NULL; m = m->m_nextpkt) { 591 if (m == mstaged) { 592 if (mprev == NULL) 593 sq->head = m->m_nextpkt; 594 else 595 mprev->m_nextpkt = m->m_nextpkt; 596 if (sq->tail == m) 597 sq->tail = mprev; 598 sq->depth--; 599 return; 600 } 601 mprev = m; 602 } 603 printf("%s: packet not found\n", __func__); 604 } 605 606 static uint32_t 607 ff_approx_txtime(struct ieee80211_node *ni, 608 const struct mbuf *m1, const struct mbuf *m2) 609 { 610 struct ieee80211com *ic = ni->ni_ic; 611 struct ieee80211vap *vap = ni->ni_vap; 612 uint32_t framelen; 613 614 /* 615 * Approximate the frame length to be transmitted. A swag to add 616 * the following maximal values to the skb payload: 617 * - 32: 802.11 encap + CRC 618 * - 24: encryption overhead (if wep bit) 619 * - 4 + 6: fast-frame header and padding 620 * - 16: 2 LLC FF tunnel headers 621 * - 14: 1 802.3 FF tunnel header (mbuf already accounts for 2nd) 622 */ 623 framelen = m1->m_pkthdr.len + 32 + 624 ATH_FF_MAX_HDR_PAD + ATH_FF_MAX_SEP_PAD + ATH_FF_MAX_HDR; 625 if (vap->iv_flags & IEEE80211_F_PRIVACY) 626 framelen += 24; 627 if (m2 != NULL) 628 framelen += m2->m_pkthdr.len; 629 return ieee80211_compute_duration(ic->ic_rt, framelen, ni->ni_txrate, 0); 630 } 631 632 /* 633 * Check if the supplied frame can be partnered with an existing 634 * or pending frame. Return a reference to any frame that should be 635 * sent on return; otherwise return NULL. 636 */ 637 struct mbuf * 638 ieee80211_ff_check(struct ieee80211_node *ni, struct mbuf *m) 639 { 640 struct ieee80211vap *vap = ni->ni_vap; 641 struct ieee80211com *ic = ni->ni_ic; 642 struct ieee80211_superg *sg = ic->ic_superg; 643 const int pri = M_WME_GETAC(m); 644 struct ieee80211_stageq *sq; 645 struct ieee80211_tx_ampdu *tap; 646 struct mbuf *mstaged; 647 uint32_t txtime, limit; 648 649 IEEE80211_TX_UNLOCK_ASSERT(ic); 650 651 /* 652 * Check if the supplied frame can be aggregated. 653 * 654 * NB: we allow EAPOL frames to be aggregated with other ucast traffic. 655 * Do 802.1x EAPOL frames proceed in the clear? Then they couldn't 656 * be aggregated with other types of frames when encryption is on? 657 */ 658 IEEE80211_LOCK(ic); 659 tap = &ni->ni_tx_ampdu[WME_AC_TO_TID(pri)]; 660 mstaged = tap->txa_private; /* NB: we reuse AMPDU state */ 661 ieee80211_txampdu_count_packet(tap); 662 663 /* 664 * When not in station mode never aggregate a multicast 665 * frame; this insures, for example, that a combined frame 666 * does not require multiple encryption keys. 667 */ 668 if (vap->iv_opmode != IEEE80211_M_STA && 669 ETHER_IS_MULTICAST(mtod(m, struct ether_header *)->ether_dhost)) { 670 /* XXX flush staged frame? */ 671 IEEE80211_UNLOCK(ic); 672 return m; 673 } 674 /* 675 * If there is no frame to combine with and the pps is 676 * too low; then do not attempt to aggregate this frame. 677 */ 678 if (mstaged == NULL && 679 ieee80211_txampdu_getpps(tap) < ieee80211_ffppsmin) { 680 IEEE80211_UNLOCK(ic); 681 return m; 682 } 683 sq = &sg->ff_stageq[pri]; 684 /* 685 * Check the txop limit to insure the aggregate fits. 686 */ 687 limit = IEEE80211_TXOP_TO_US( 688 ic->ic_wme.wme_chanParams.cap_wmeParams[pri].wmep_txopLimit); 689 if (limit != 0 && 690 (txtime = ff_approx_txtime(ni, m, mstaged)) > limit) { 691 /* 692 * Aggregate too long, return to the caller for direct 693 * transmission. In addition, flush any pending frame 694 * before sending this one. 695 */ 696 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 697 "%s: txtime %u exceeds txop limit %u\n", 698 __func__, txtime, limit); 699 700 tap->txa_private = NULL; 701 if (mstaged != NULL) 702 stageq_remove(ic, sq, mstaged); 703 IEEE80211_UNLOCK(ic); 704 705 if (mstaged != NULL) { 706 IEEE80211_TX_LOCK(ic); 707 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 708 "%s: flush staged frame", __func__); 709 /* encap and xmit */ 710 ff_transmit(ni, mstaged); 711 IEEE80211_TX_UNLOCK(ic); 712 } 713 return m; /* NB: original frame */ 714 } 715 /* 716 * An aggregation candidate. If there's a frame to partner 717 * with then combine and return for processing. Otherwise 718 * save this frame and wait for a partner to show up (or 719 * the frame to be flushed). Note that staged frames also 720 * hold their node reference. 721 */ 722 if (mstaged != NULL) { 723 tap->txa_private = NULL; 724 stageq_remove(ic, sq, mstaged); 725 IEEE80211_UNLOCK(ic); 726 727 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 728 "%s: aggregate fast-frame", __func__); 729 /* 730 * Release the node reference; we only need 731 * the one already in mstaged. 732 */ 733 KASSERT(mstaged->m_pkthdr.rcvif == (void *)ni, 734 ("rcvif %p ni %p", mstaged->m_pkthdr.rcvif, ni)); 735 ieee80211_free_node(ni); 736 737 m->m_nextpkt = NULL; 738 mstaged->m_nextpkt = m; 739 mstaged->m_flags |= M_FF; /* NB: mark for encap work */ 740 } else { 741 KASSERT(tap->txa_private == NULL, 742 ("txa_private %p", tap->txa_private)); 743 tap->txa_private = m; 744 745 stageq_add(ic, sq, m); 746 IEEE80211_UNLOCK(ic); 747 748 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 749 "%s: stage frame, %u queued", __func__, sq->depth); 750 /* NB: mstaged is NULL */ 751 } 752 return mstaged; 753 } 754 755 void 756 ieee80211_ff_node_init(struct ieee80211_node *ni) 757 { 758 /* 759 * Clean FF state on re-associate. This handles the case 760 * where a station leaves w/o notifying us and then returns 761 * before node is reaped for inactivity. 762 */ 763 ieee80211_ff_node_cleanup(ni); 764 } 765 766 void 767 ieee80211_ff_node_cleanup(struct ieee80211_node *ni) 768 { 769 struct ieee80211com *ic = ni->ni_ic; 770 struct ieee80211_superg *sg = ic->ic_superg; 771 struct ieee80211_tx_ampdu *tap; 772 struct mbuf *m, *next_m, *head; 773 int tid; 774 775 IEEE80211_LOCK(ic); 776 head = NULL; 777 for (tid = 0; tid < WME_NUM_TID; tid++) { 778 int ac = TID_TO_WME_AC(tid); 779 780 tap = &ni->ni_tx_ampdu[tid]; 781 m = tap->txa_private; 782 if (m != NULL) { 783 tap->txa_private = NULL; 784 stageq_remove(ic, &sg->ff_stageq[ac], m); 785 m->m_nextpkt = head; 786 head = m; 787 } 788 } 789 IEEE80211_UNLOCK(ic); 790 791 /* 792 * Free mbufs, taking care to not dereference the mbuf after 793 * we free it (hence grabbing m_nextpkt before we free it.) 794 */ 795 m = head; 796 while (m != NULL) { 797 next_m = m->m_nextpkt; 798 m_freem(m); 799 ieee80211_free_node(ni); 800 m = next_m; 801 } 802 } 803 804 /* 805 * Switch between turbo and non-turbo operating modes. 806 * Use the specified channel flags to locate the new 807 * channel, update 802.11 state, and then call back into 808 * the driver to effect the change. 809 */ 810 void 811 ieee80211_dturbo_switch(struct ieee80211vap *vap, int newflags) 812 { 813 struct ieee80211com *ic = vap->iv_ic; 814 struct ieee80211_channel *chan; 815 816 chan = ieee80211_find_channel(ic, ic->ic_bsschan->ic_freq, newflags); 817 if (chan == NULL) { /* XXX should not happen */ 818 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 819 "%s: no channel with freq %u flags 0x%x\n", 820 __func__, ic->ic_bsschan->ic_freq, newflags); 821 return; 822 } 823 824 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 825 "%s: %s -> %s (freq %u flags 0x%x)\n", __func__, 826 ieee80211_phymode_name[ieee80211_chan2mode(ic->ic_bsschan)], 827 ieee80211_phymode_name[ieee80211_chan2mode(chan)], 828 chan->ic_freq, chan->ic_flags); 829 830 ic->ic_bsschan = chan; 831 ic->ic_prevchan = ic->ic_curchan; 832 ic->ic_curchan = chan; 833 ic->ic_rt = ieee80211_get_ratetable(chan); 834 ic->ic_set_channel(ic); 835 ieee80211_radiotap_chan_change(ic); 836 /* NB: do not need to reset ERP state 'cuz we're in sta mode */ 837 } 838 839 /* 840 * Return the current ``state'' of an Atheros capbility. 841 * If associated in station mode report the negotiated 842 * setting. Otherwise report the current setting. 843 */ 844 static int 845 getathcap(struct ieee80211vap *vap, int cap) 846 { 847 if (vap->iv_opmode == IEEE80211_M_STA && 848 vap->iv_state == IEEE80211_S_RUN) 849 return IEEE80211_ATH_CAP(vap, vap->iv_bss, cap) != 0; 850 else 851 return (vap->iv_flags & cap) != 0; 852 } 853 854 static int 855 superg_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 856 { 857 switch (ireq->i_type) { 858 case IEEE80211_IOC_FF: 859 ireq->i_val = getathcap(vap, IEEE80211_F_FF); 860 break; 861 case IEEE80211_IOC_TURBOP: 862 ireq->i_val = getathcap(vap, IEEE80211_F_TURBOP); 863 break; 864 default: 865 return ENOSYS; 866 } 867 return 0; 868 } 869 IEEE80211_IOCTL_GET(superg, superg_ioctl_get80211); 870 871 static int 872 superg_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 873 { 874 switch (ireq->i_type) { 875 case IEEE80211_IOC_FF: 876 if (ireq->i_val) { 877 if ((vap->iv_caps & IEEE80211_C_FF) == 0) 878 return EOPNOTSUPP; 879 vap->iv_flags |= IEEE80211_F_FF; 880 } else 881 vap->iv_flags &= ~IEEE80211_F_FF; 882 return ENETRESET; 883 case IEEE80211_IOC_TURBOP: 884 if (ireq->i_val) { 885 if ((vap->iv_caps & IEEE80211_C_TURBOP) == 0) 886 return EOPNOTSUPP; 887 vap->iv_flags |= IEEE80211_F_TURBOP; 888 } else 889 vap->iv_flags &= ~IEEE80211_F_TURBOP; 890 return ENETRESET; 891 default: 892 return ENOSYS; 893 } 894 return 0; 895 } 896 IEEE80211_IOCTL_SET(superg, superg_ioctl_set80211); 897 898 #endif /* IEEE80211_SUPPORT_SUPERG */ 899