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 * Do Ethernet-LLC encapsulation for each payload in a fast frame 334 * tunnel encapsulation. The frame is assumed to have an Ethernet 335 * header at the front that must be stripped before prepending the 336 * LLC followed by the Ethernet header passed in (with an Ethernet 337 * type that specifies the payload size). 338 */ 339 static struct mbuf * 340 ff_encap1(struct ieee80211vap *vap, struct mbuf *m, 341 const struct ether_header *eh) 342 { 343 struct llc *llc; 344 uint16_t payload; 345 346 /* XXX optimize by combining m_adj+M_PREPEND */ 347 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 348 llc = mtod(m, struct llc *); 349 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 350 llc->llc_control = LLC_UI; 351 llc->llc_snap.org_code[0] = 0; 352 llc->llc_snap.org_code[1] = 0; 353 llc->llc_snap.org_code[2] = 0; 354 llc->llc_snap.ether_type = eh->ether_type; 355 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */ 356 357 M_PREPEND(m, sizeof(struct ether_header), M_NOWAIT); 358 if (m == NULL) { /* XXX cannot happen */ 359 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 360 "%s: no space for ether_header\n", __func__); 361 vap->iv_stats.is_tx_nobuf++; 362 return NULL; 363 } 364 ETHER_HEADER_COPY(mtod(m, void *), eh); 365 mtod(m, struct ether_header *)->ether_type = htons(payload); 366 return m; 367 } 368 369 /* 370 * Fast frame encapsulation. There must be two packets 371 * chained with m_nextpkt. We do header adjustment for 372 * each, add the tunnel encapsulation, and then concatenate 373 * the mbuf chains to form a single frame for transmission. 374 */ 375 struct mbuf * 376 ieee80211_ff_encap(struct ieee80211vap *vap, struct mbuf *m1, int hdrspace, 377 struct ieee80211_key *key) 378 { 379 struct mbuf *m2; 380 struct ether_header eh1, eh2; 381 struct llc *llc; 382 struct mbuf *m; 383 int pad; 384 385 m2 = m1->m_nextpkt; 386 if (m2 == NULL) { 387 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 388 "%s: only one frame\n", __func__); 389 goto bad; 390 } 391 m1->m_nextpkt = NULL; 392 /* 393 * Include fast frame headers in adjusting header layout. 394 */ 395 KASSERT(m1->m_len >= sizeof(eh1), ("no ethernet header!")); 396 ETHER_HEADER_COPY(&eh1, mtod(m1, caddr_t)); 397 m1 = ieee80211_mbuf_adjust(vap, 398 hdrspace + sizeof(struct llc) + sizeof(uint32_t) + 2 + 399 sizeof(struct ether_header), 400 key, m1); 401 if (m1 == NULL) { 402 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 403 m_freem(m2); 404 goto bad; 405 } 406 407 /* 408 * Copy second frame's Ethernet header out of line 409 * and adjust for encapsulation headers. Note that 410 * we make room for padding in case there isn't room 411 * at the end of first frame. 412 */ 413 KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!")); 414 ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t)); 415 m2 = ieee80211_mbuf_adjust(vap, 416 ATH_FF_MAX_HDR_PAD + sizeof(struct ether_header), 417 NULL, m2); 418 if (m2 == NULL) { 419 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 420 goto bad; 421 } 422 423 /* 424 * Now do tunnel encapsulation. First, each 425 * frame gets a standard encapsulation. 426 */ 427 m1 = ff_encap1(vap, m1, &eh1); 428 if (m1 == NULL) 429 goto bad; 430 m2 = ff_encap1(vap, m2, &eh2); 431 if (m2 == NULL) 432 goto bad; 433 434 /* 435 * Pad leading frame to a 4-byte boundary. If there 436 * is space at the end of the first frame, put it 437 * there; otherwise prepend to the front of the second 438 * frame. We know doing the second will always work 439 * because we reserve space above. We prefer appending 440 * as this typically has better DMA alignment properties. 441 */ 442 for (m = m1; m->m_next != NULL; m = m->m_next) 443 ; 444 pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len; 445 if (pad) { 446 if (M_TRAILINGSPACE(m) < pad) { /* prepend to second */ 447 m2->m_data -= pad; 448 m2->m_len += pad; 449 m2->m_pkthdr.len += pad; 450 } else { /* append to first */ 451 m->m_len += pad; 452 m1->m_pkthdr.len += pad; 453 } 454 } 455 456 /* 457 * Now, stick 'em together and prepend the tunnel headers; 458 * first the Atheros tunnel header (all zero for now) and 459 * then a special fast frame LLC. 460 * 461 * XXX optimize by prepending together 462 */ 463 m->m_next = m2; /* NB: last mbuf from above */ 464 m1->m_pkthdr.len += m2->m_pkthdr.len; 465 M_PREPEND(m1, sizeof(uint32_t)+2, M_NOWAIT); 466 if (m1 == NULL) { /* XXX cannot happen */ 467 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 468 "%s: no space for tunnel header\n", __func__); 469 vap->iv_stats.is_tx_nobuf++; 470 return NULL; 471 } 472 memset(mtod(m1, void *), 0, sizeof(uint32_t)+2); 473 474 M_PREPEND(m1, sizeof(struct llc), M_NOWAIT); 475 if (m1 == NULL) { /* XXX cannot happen */ 476 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 477 "%s: no space for llc header\n", __func__); 478 vap->iv_stats.is_tx_nobuf++; 479 return NULL; 480 } 481 llc = mtod(m1, struct llc *); 482 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 483 llc->llc_control = LLC_UI; 484 llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0; 485 llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1; 486 llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2; 487 llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE); 488 489 vap->iv_stats.is_ff_encap++; 490 491 return m1; 492 bad: 493 if (m1 != NULL) 494 m_freem(m1); 495 if (m2 != NULL) 496 m_freem(m2); 497 return NULL; 498 } 499 500 static void 501 ff_transmit(struct ieee80211_node *ni, struct mbuf *m) 502 { 503 struct ieee80211vap *vap = ni->ni_vap; 504 struct ieee80211com *ic = ni->ni_ic; 505 int error; 506 507 IEEE80211_TX_LOCK_ASSERT(vap->iv_ic); 508 509 /* encap and xmit */ 510 m = ieee80211_encap(vap, ni, m); 511 if (m != NULL) { 512 struct ifnet *ifp = vap->iv_ifp; 513 514 error = ieee80211_parent_transmit(ic, m);; 515 if (error != 0) { 516 /* NB: IFQ_HANDOFF reclaims mbuf */ 517 ieee80211_free_node(ni); 518 } else { 519 ifp->if_opackets++; 520 } 521 } else 522 ieee80211_free_node(ni); 523 } 524 525 /* 526 * Flush frames to device; note we re-use the linked list 527 * the frames were stored on and use the sentinel (unchanged) 528 * which may be non-NULL. 529 */ 530 static void 531 ff_flush(struct mbuf *head, struct mbuf *last) 532 { 533 struct mbuf *m, *next; 534 struct ieee80211_node *ni; 535 struct ieee80211vap *vap; 536 537 for (m = head; m != last; m = next) { 538 next = m->m_nextpkt; 539 m->m_nextpkt = NULL; 540 541 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif; 542 vap = ni->ni_vap; 543 544 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 545 "%s: flush frame, age %u", __func__, M_AGE_GET(m)); 546 vap->iv_stats.is_ff_flush++; 547 548 ff_transmit(ni, m); 549 } 550 } 551 552 /* 553 * Age frames on the staging queue. 554 * 555 * This is called without the comlock held, but it does all its work 556 * behind the comlock. Because of this, it's possible that the 557 * staging queue will be serviced between the function which called 558 * it and now; thus simply checking that the queue has work in it 559 * may fail. 560 * 561 * See PR kern/174283 for more details. 562 */ 563 void 564 ieee80211_ff_age(struct ieee80211com *ic, struct ieee80211_stageq *sq, 565 int quanta) 566 { 567 struct mbuf *m, *head; 568 struct ieee80211_node *ni; 569 struct ieee80211_tx_ampdu *tap; 570 571 #if 0 572 KASSERT(sq->head != NULL, ("stageq empty")); 573 #endif 574 575 IEEE80211_LOCK(ic); 576 head = sq->head; 577 while ((m = sq->head) != NULL && M_AGE_GET(m) < quanta) { 578 int tid = WME_AC_TO_TID(M_WME_GETAC(m)); 579 580 /* clear tap ref to frame */ 581 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif; 582 tap = &ni->ni_tx_ampdu[tid]; 583 KASSERT(tap->txa_private == m, ("staging queue empty")); 584 tap->txa_private = NULL; 585 586 sq->head = m->m_nextpkt; 587 sq->depth--; 588 } 589 if (m == NULL) 590 sq->tail = NULL; 591 else 592 M_AGE_SUB(m, quanta); 593 IEEE80211_UNLOCK(ic); 594 595 IEEE80211_TX_LOCK(ic); 596 ff_flush(head, m); 597 IEEE80211_TX_UNLOCK(ic); 598 } 599 600 static void 601 stageq_add(struct ieee80211com *ic, struct ieee80211_stageq *sq, struct mbuf *m) 602 { 603 int age = ieee80211_ffagemax; 604 605 IEEE80211_LOCK_ASSERT(ic); 606 607 if (sq->tail != NULL) { 608 sq->tail->m_nextpkt = m; 609 age -= M_AGE_GET(sq->head); 610 } else 611 sq->head = m; 612 KASSERT(age >= 0, ("age %d", age)); 613 M_AGE_SET(m, age); 614 m->m_nextpkt = NULL; 615 sq->tail = m; 616 sq->depth++; 617 } 618 619 static void 620 stageq_remove(struct ieee80211com *ic, struct ieee80211_stageq *sq, struct mbuf *mstaged) 621 { 622 struct mbuf *m, *mprev; 623 624 IEEE80211_LOCK_ASSERT(ic); 625 626 mprev = NULL; 627 for (m = sq->head; m != NULL; m = m->m_nextpkt) { 628 if (m == mstaged) { 629 if (mprev == NULL) 630 sq->head = m->m_nextpkt; 631 else 632 mprev->m_nextpkt = m->m_nextpkt; 633 if (sq->tail == m) 634 sq->tail = mprev; 635 sq->depth--; 636 return; 637 } 638 mprev = m; 639 } 640 printf("%s: packet not found\n", __func__); 641 } 642 643 static uint32_t 644 ff_approx_txtime(struct ieee80211_node *ni, 645 const struct mbuf *m1, const struct mbuf *m2) 646 { 647 struct ieee80211com *ic = ni->ni_ic; 648 struct ieee80211vap *vap = ni->ni_vap; 649 uint32_t framelen; 650 651 /* 652 * Approximate the frame length to be transmitted. A swag to add 653 * the following maximal values to the skb payload: 654 * - 32: 802.11 encap + CRC 655 * - 24: encryption overhead (if wep bit) 656 * - 4 + 6: fast-frame header and padding 657 * - 16: 2 LLC FF tunnel headers 658 * - 14: 1 802.3 FF tunnel header (mbuf already accounts for 2nd) 659 */ 660 framelen = m1->m_pkthdr.len + 32 + 661 ATH_FF_MAX_HDR_PAD + ATH_FF_MAX_SEP_PAD + ATH_FF_MAX_HDR; 662 if (vap->iv_flags & IEEE80211_F_PRIVACY) 663 framelen += 24; 664 if (m2 != NULL) 665 framelen += m2->m_pkthdr.len; 666 return ieee80211_compute_duration(ic->ic_rt, framelen, ni->ni_txrate, 0); 667 } 668 669 /* 670 * Check if the supplied frame can be partnered with an existing 671 * or pending frame. Return a reference to any frame that should be 672 * sent on return; otherwise return NULL. 673 */ 674 struct mbuf * 675 ieee80211_ff_check(struct ieee80211_node *ni, struct mbuf *m) 676 { 677 struct ieee80211vap *vap = ni->ni_vap; 678 struct ieee80211com *ic = ni->ni_ic; 679 struct ieee80211_superg *sg = ic->ic_superg; 680 const int pri = M_WME_GETAC(m); 681 struct ieee80211_stageq *sq; 682 struct ieee80211_tx_ampdu *tap; 683 struct mbuf *mstaged; 684 uint32_t txtime, limit; 685 686 IEEE80211_TX_UNLOCK_ASSERT(ic); 687 688 /* 689 * Check if the supplied frame can be aggregated. 690 * 691 * NB: we allow EAPOL frames to be aggregated with other ucast traffic. 692 * Do 802.1x EAPOL frames proceed in the clear? Then they couldn't 693 * be aggregated with other types of frames when encryption is on? 694 */ 695 IEEE80211_LOCK(ic); 696 tap = &ni->ni_tx_ampdu[WME_AC_TO_TID(pri)]; 697 mstaged = tap->txa_private; /* NB: we reuse AMPDU state */ 698 ieee80211_txampdu_count_packet(tap); 699 700 /* 701 * When not in station mode never aggregate a multicast 702 * frame; this insures, for example, that a combined frame 703 * does not require multiple encryption keys. 704 */ 705 if (vap->iv_opmode != IEEE80211_M_STA && 706 ETHER_IS_MULTICAST(mtod(m, struct ether_header *)->ether_dhost)) { 707 /* XXX flush staged frame? */ 708 IEEE80211_UNLOCK(ic); 709 return m; 710 } 711 /* 712 * If there is no frame to combine with and the pps is 713 * too low; then do not attempt to aggregate this frame. 714 */ 715 if (mstaged == NULL && 716 ieee80211_txampdu_getpps(tap) < ieee80211_ffppsmin) { 717 IEEE80211_UNLOCK(ic); 718 return m; 719 } 720 sq = &sg->ff_stageq[pri]; 721 /* 722 * Check the txop limit to insure the aggregate fits. 723 */ 724 limit = IEEE80211_TXOP_TO_US( 725 ic->ic_wme.wme_chanParams.cap_wmeParams[pri].wmep_txopLimit); 726 if (limit != 0 && 727 (txtime = ff_approx_txtime(ni, m, mstaged)) > limit) { 728 /* 729 * Aggregate too long, return to the caller for direct 730 * transmission. In addition, flush any pending frame 731 * before sending this one. 732 */ 733 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 734 "%s: txtime %u exceeds txop limit %u\n", 735 __func__, txtime, limit); 736 737 tap->txa_private = NULL; 738 if (mstaged != NULL) 739 stageq_remove(ic, sq, mstaged); 740 IEEE80211_UNLOCK(ic); 741 742 if (mstaged != NULL) { 743 IEEE80211_TX_LOCK(ic); 744 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 745 "%s: flush staged frame", __func__); 746 /* encap and xmit */ 747 ff_transmit(ni, mstaged); 748 IEEE80211_TX_UNLOCK(ic); 749 } 750 return m; /* NB: original frame */ 751 } 752 /* 753 * An aggregation candidate. If there's a frame to partner 754 * with then combine and return for processing. Otherwise 755 * save this frame and wait for a partner to show up (or 756 * the frame to be flushed). Note that staged frames also 757 * hold their node reference. 758 */ 759 if (mstaged != NULL) { 760 tap->txa_private = NULL; 761 stageq_remove(ic, sq, mstaged); 762 IEEE80211_UNLOCK(ic); 763 764 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 765 "%s: aggregate fast-frame", __func__); 766 /* 767 * Release the node reference; we only need 768 * the one already in mstaged. 769 */ 770 KASSERT(mstaged->m_pkthdr.rcvif == (void *)ni, 771 ("rcvif %p ni %p", mstaged->m_pkthdr.rcvif, ni)); 772 ieee80211_free_node(ni); 773 774 m->m_nextpkt = NULL; 775 mstaged->m_nextpkt = m; 776 mstaged->m_flags |= M_FF; /* NB: mark for encap work */ 777 } else { 778 KASSERT(tap->txa_private == NULL, 779 ("txa_private %p", tap->txa_private)); 780 tap->txa_private = m; 781 782 stageq_add(ic, sq, m); 783 IEEE80211_UNLOCK(ic); 784 785 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 786 "%s: stage frame, %u queued", __func__, sq->depth); 787 /* NB: mstaged is NULL */ 788 } 789 return mstaged; 790 } 791 792 void 793 ieee80211_ff_node_init(struct ieee80211_node *ni) 794 { 795 /* 796 * Clean FF state on re-associate. This handles the case 797 * where a station leaves w/o notifying us and then returns 798 * before node is reaped for inactivity. 799 */ 800 ieee80211_ff_node_cleanup(ni); 801 } 802 803 void 804 ieee80211_ff_node_cleanup(struct ieee80211_node *ni) 805 { 806 struct ieee80211com *ic = ni->ni_ic; 807 struct ieee80211_superg *sg = ic->ic_superg; 808 struct ieee80211_tx_ampdu *tap; 809 struct mbuf *m, *next_m, *head; 810 int tid; 811 812 IEEE80211_LOCK(ic); 813 head = NULL; 814 for (tid = 0; tid < WME_NUM_TID; tid++) { 815 int ac = TID_TO_WME_AC(tid); 816 817 tap = &ni->ni_tx_ampdu[tid]; 818 m = tap->txa_private; 819 if (m != NULL) { 820 tap->txa_private = NULL; 821 stageq_remove(ic, &sg->ff_stageq[ac], m); 822 m->m_nextpkt = head; 823 head = m; 824 } 825 } 826 IEEE80211_UNLOCK(ic); 827 828 /* 829 * Free mbufs, taking care to not dereference the mbuf after 830 * we free it (hence grabbing m_nextpkt before we free it.) 831 */ 832 m = head; 833 while (m != NULL) { 834 next_m = m->m_nextpkt; 835 m_freem(m); 836 ieee80211_free_node(ni); 837 m = next_m; 838 } 839 } 840 841 /* 842 * Switch between turbo and non-turbo operating modes. 843 * Use the specified channel flags to locate the new 844 * channel, update 802.11 state, and then call back into 845 * the driver to effect the change. 846 */ 847 void 848 ieee80211_dturbo_switch(struct ieee80211vap *vap, int newflags) 849 { 850 struct ieee80211com *ic = vap->iv_ic; 851 struct ieee80211_channel *chan; 852 853 chan = ieee80211_find_channel(ic, ic->ic_bsschan->ic_freq, newflags); 854 if (chan == NULL) { /* XXX should not happen */ 855 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 856 "%s: no channel with freq %u flags 0x%x\n", 857 __func__, ic->ic_bsschan->ic_freq, newflags); 858 return; 859 } 860 861 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 862 "%s: %s -> %s (freq %u flags 0x%x)\n", __func__, 863 ieee80211_phymode_name[ieee80211_chan2mode(ic->ic_bsschan)], 864 ieee80211_phymode_name[ieee80211_chan2mode(chan)], 865 chan->ic_freq, chan->ic_flags); 866 867 ic->ic_bsschan = chan; 868 ic->ic_prevchan = ic->ic_curchan; 869 ic->ic_curchan = chan; 870 ic->ic_rt = ieee80211_get_ratetable(chan); 871 ic->ic_set_channel(ic); 872 ieee80211_radiotap_chan_change(ic); 873 /* NB: do not need to reset ERP state 'cuz we're in sta mode */ 874 } 875 876 /* 877 * Return the current ``state'' of an Atheros capbility. 878 * If associated in station mode report the negotiated 879 * setting. Otherwise report the current setting. 880 */ 881 static int 882 getathcap(struct ieee80211vap *vap, int cap) 883 { 884 if (vap->iv_opmode == IEEE80211_M_STA && 885 vap->iv_state == IEEE80211_S_RUN) 886 return IEEE80211_ATH_CAP(vap, vap->iv_bss, cap) != 0; 887 else 888 return (vap->iv_flags & cap) != 0; 889 } 890 891 static int 892 superg_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 893 { 894 switch (ireq->i_type) { 895 case IEEE80211_IOC_FF: 896 ireq->i_val = getathcap(vap, IEEE80211_F_FF); 897 break; 898 case IEEE80211_IOC_TURBOP: 899 ireq->i_val = getathcap(vap, IEEE80211_F_TURBOP); 900 break; 901 default: 902 return ENOSYS; 903 } 904 return 0; 905 } 906 IEEE80211_IOCTL_GET(superg, superg_ioctl_get80211); 907 908 static int 909 superg_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 910 { 911 switch (ireq->i_type) { 912 case IEEE80211_IOC_FF: 913 if (ireq->i_val) { 914 if ((vap->iv_caps & IEEE80211_C_FF) == 0) 915 return EOPNOTSUPP; 916 vap->iv_flags |= IEEE80211_F_FF; 917 } else 918 vap->iv_flags &= ~IEEE80211_F_FF; 919 return ENETRESET; 920 case IEEE80211_IOC_TURBOP: 921 if (ireq->i_val) { 922 if ((vap->iv_caps & IEEE80211_C_TURBOP) == 0) 923 return EOPNOTSUPP; 924 vap->iv_flags |= IEEE80211_F_TURBOP; 925 } else 926 vap->iv_flags &= ~IEEE80211_F_TURBOP; 927 return ENETRESET; 928 default: 929 return ENOSYS; 930 } 931 return 0; 932 } 933 IEEE80211_IOCTL_SET(superg, superg_ioctl_set80211); 934 935 #endif /* IEEE80211_SUPPORT_SUPERG */ 936