Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/rtwn/usb/rtwn_usb_rx.c
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1 /* $OpenBSD: if_urtwn.c,v 1.16 2011/02/10 17:26:40 jakemsr Exp $ */ 2 3 /*- 4 * Copyright (c) 2010 Damien Bergamini <damien.bergamini@free.fr> 5 * Copyright (c) 2014 Kevin Lo <kevlo@FreeBSD.org> 6 * Copyright (c) 2015-2016 Andriy Voskoboinyk <avos@FreeBSD.org> 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose with or without fee is hereby granted, provided that the above 10 * copyright notice and this permission notice appear in all copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 21 #include <sys/cdefs.h> 22 __FBSDID("$FreeBSD$"); 23 24 #include "opt_wlan.h" 25 26 #include <sys/param.h> 27 #include <sys/lock.h> 28 #include <sys/mutex.h> 29 #include <sys/mbuf.h> 30 #include <sys/kernel.h> 31 #include <sys/socket.h> 32 #include <sys/systm.h> 33 #include <sys/malloc.h> 34 #include <sys/queue.h> 35 #include <sys/taskqueue.h> 36 #include <sys/bus.h> 37 #include <sys/endian.h> 38 39 #include <net/if.h> 40 #include <net/if_var.h> 41 #include <net/ethernet.h> 42 #include <net/if_dl.h> 43 #include <net/if_media.h> 44 45 #include <net80211/ieee80211_var.h> 46 #include <net80211/ieee80211_radiotap.h> 47 #ifdef IEEE80211_SUPPORT_SUPERG 48 #include <net80211/ieee80211_superg.h> 49 #endif 50 51 #include <dev/usb/usb.h> 52 #include <dev/usb/usbdi.h> 53 54 #include <dev/rtwn/if_rtwnreg.h> 55 #include <dev/rtwn/if_rtwnvar.h> 56 57 #include <dev/rtwn/if_rtwn_debug.h> 58 #include <dev/rtwn/if_rtwn_ridx.h> 59 #include <dev/rtwn/if_rtwn_rx.h> 60 #include <dev/rtwn/if_rtwn_task.h> 61 #include <dev/rtwn/if_rtwn_tx.h> 62 63 #include <dev/rtwn/usb/rtwn_usb_var.h> 64 #include <dev/rtwn/usb/rtwn_usb_rx.h> 65 66 static struct mbuf * rtwn_rxeof(struct rtwn_softc *, struct rtwn_data *, 67 uint8_t *, int); 68 69 static int 70 rtwn_rx_check_pre_alloc(struct rtwn_softc *sc, 71 struct rtwn_rx_stat_common *stat) 72 { 73 uint32_t rxdw0; 74 int pktlen; 75 76 RTWN_ASSERT_LOCKED(sc); 77 78 /* 79 * don't pass packets to the ieee80211 framework if the driver isn't 80 * RUNNING. 81 */ 82 if (!(sc->sc_flags & RTWN_RUNNING)) 83 return (-1); 84 85 rxdw0 = le32toh(stat->rxdw0); 86 if (__predict_false(rxdw0 & (RTWN_RXDW0_CRCERR | RTWN_RXDW0_ICVERR))) { 87 /* 88 * This should not happen since we setup our Rx filter 89 * to not receive these frames. 90 */ 91 RTWN_DPRINTF(sc, RTWN_DEBUG_RECV, 92 "%s: RX flags error (%s)\n", __func__, 93 rxdw0 & RTWN_RXDW0_CRCERR ? "CRC" : "ICV"); 94 return (-1); 95 } 96 97 pktlen = MS(rxdw0, RTWN_RXDW0_PKTLEN); 98 if (__predict_false(pktlen < sizeof(struct ieee80211_frame_ack))) { 99 /* 100 * Should not happen (because of Rx filter setup). 101 */ 102 RTWN_DPRINTF(sc, RTWN_DEBUG_RECV, 103 "%s: frame is too short: %d\n", __func__, pktlen); 104 return (-1); 105 } 106 107 return (0); 108 } 109 110 static struct mbuf * 111 rtwn_rx_copy_to_mbuf(struct rtwn_softc *sc, struct rtwn_rx_stat_common *stat, 112 int totlen) 113 { 114 struct ieee80211com *ic = &sc->sc_ic; 115 struct mbuf *m; 116 117 RTWN_ASSERT_LOCKED(sc); 118 119 /* Dump Rx descriptor. */ 120 RTWN_DPRINTF(sc, RTWN_DEBUG_RECV_DESC, 121 "%s: dw: 0 %08X, 1 %08X, 2 %08X, 3 %08X, 4 %08X, tsfl %08X\n", 122 __func__, le32toh(stat->rxdw0), le32toh(stat->rxdw1), 123 le32toh(stat->rxdw2), le32toh(stat->rxdw3), le32toh(stat->rxdw4), 124 le32toh(stat->tsf_low)); 125 126 if (rtwn_rx_check_pre_alloc(sc, stat) != 0) 127 goto fail; 128 129 m = m_get2(totlen, M_NOWAIT, MT_DATA, M_PKTHDR); 130 if (__predict_false(m == NULL)) { 131 device_printf(sc->sc_dev, "%s: could not allocate RX mbuf\n", 132 __func__); 133 goto fail; 134 } 135 136 /* Finalize mbuf. */ 137 memcpy(mtod(m, uint8_t *), (uint8_t *)stat, totlen); 138 m->m_pkthdr.len = m->m_len = totlen; 139 140 if (rtwn_check_frame(sc, m) != 0) { 141 m_freem(m); 142 goto fail; 143 } 144 145 return (m); 146 fail: 147 counter_u64_add(ic->ic_ierrors, 1); 148 return (NULL); 149 } 150 151 static struct mbuf * 152 rtwn_rxeof_fragmented(struct rtwn_usb_softc *uc, struct rtwn_data *data, 153 uint8_t *buf, int len) 154 { 155 struct rtwn_softc *sc = &uc->uc_sc; 156 struct ieee80211com *ic = &sc->sc_ic; 157 struct rtwn_rx_stat_common *stat = &uc->uc_rx_stat; 158 uint32_t rxdw0; 159 int totlen, pktlen, infosz, min_len; 160 int orig_len = len; 161 int alloc_mbuf = 0; 162 163 /* Check if Rx descriptor is not truncated. */ 164 if (uc->uc_rx_stat_len < sizeof(*stat)) { 165 min_len = min(sizeof(*stat) - uc->uc_rx_stat_len, len); 166 memcpy((uint8_t *)stat + uc->uc_rx_stat_len, buf, min_len); 167 168 uc->uc_rx_stat_len += min_len; 169 buf += min_len; 170 len -= min_len; 171 172 if (uc->uc_rx_stat_len < sizeof(*stat)) 173 goto end; 174 175 KASSERT(data->m == NULL, ("%s: data->m != NULL!\n", __func__)); 176 alloc_mbuf = 1; 177 178 /* Dump Rx descriptor. */ 179 RTWN_DPRINTF(sc, RTWN_DEBUG_RECV_DESC, 180 "%s: dw: 0 %08X, 1 %08X, 2 %08X, 3 %08X, 4 %08X, " 181 "tsfl %08X\n", __func__, le32toh(stat->rxdw0), 182 le32toh(stat->rxdw1), le32toh(stat->rxdw2), 183 le32toh(stat->rxdw3), le32toh(stat->rxdw4), 184 le32toh(stat->tsf_low)); 185 } 186 187 rxdw0 = le32toh(stat->rxdw0); 188 pktlen = MS(rxdw0, RTWN_RXDW0_PKTLEN); 189 infosz = MS(rxdw0, RTWN_RXDW0_INFOSZ) * 8; 190 totlen = sizeof(*stat) + infosz + pktlen; 191 if (alloc_mbuf) { 192 if (rtwn_rx_check_pre_alloc(sc, stat) == 0) { 193 data->m = m_getm(NULL, totlen, M_NOWAIT, MT_DATA); 194 if (data->m != NULL) { 195 m_copyback(data->m, 0, uc->uc_rx_stat_len, 196 (caddr_t)stat); 197 198 if (rtwn_check_frame(sc, data->m) != 0) { 199 m_freem(data->m); 200 data->m = NULL; 201 counter_u64_add(ic->ic_ierrors, 1); 202 } 203 } else 204 counter_u64_add(ic->ic_ierrors, 1); 205 } else 206 counter_u64_add(ic->ic_ierrors, 1); 207 208 uc->uc_rx_off = sizeof(*stat); 209 } 210 211 /* If mbuf allocation fails just discard the data. */ 212 min_len = min(totlen - uc->uc_rx_off, len); 213 if (data->m != NULL) 214 m_copyback(data->m, uc->uc_rx_off, min_len, buf); 215 216 uc->uc_rx_off += min_len; 217 if (uc->uc_rx_off == totlen) { 218 /* Align next frame. */ 219 min_len = rtwn_usb_align_rx(uc, 220 orig_len - len + min_len, orig_len); 221 min_len -= (orig_len - len); 222 KASSERT(len >= min_len, ("%s: len (%d) < min_len (%d)!\n", 223 __func__, len, min_len)); 224 225 /* Clear mbuf stats. */ 226 uc->uc_rx_stat_len = 0; 227 uc->uc_rx_off = 0; 228 } 229 len -= min_len; 230 buf += min_len; 231 end: 232 if (uc->uc_rx_stat_len == 0) 233 return (rtwn_rxeof(sc, data, buf, len)); 234 else 235 return (NULL); 236 } 237 238 static struct mbuf * 239 rtwn_rxeof(struct rtwn_softc *sc, struct rtwn_data *data, uint8_t *buf, 240 int len) 241 { 242 struct rtwn_usb_softc *uc = RTWN_USB_SOFTC(sc); 243 struct rtwn_rx_stat_common *stat; 244 struct mbuf *m, *m0 = NULL; 245 uint32_t rxdw0; 246 int totlen, pktlen, infosz; 247 248 /* Prepend defragmented frame (if any). */ 249 if (data->m != NULL) { 250 m0 = m = data->m; 251 data->m = NULL; 252 } 253 254 /* Process packets. */ 255 while (len >= sizeof(*stat)) { 256 stat = (struct rtwn_rx_stat_common *)buf; 257 rxdw0 = le32toh(stat->rxdw0); 258 259 pktlen = MS(rxdw0, RTWN_RXDW0_PKTLEN); 260 if (__predict_false(pktlen == 0)) 261 break; 262 263 infosz = MS(rxdw0, RTWN_RXDW0_INFOSZ) * 8; 264 265 /* Make sure everything fits in xfer. */ 266 totlen = sizeof(*stat) + infosz + pktlen; 267 if (totlen > len) { 268 RTWN_DPRINTF(sc, RTWN_DEBUG_RECV, 269 "%s: frame is fragmented (totlen %d len %d)\n", 270 __func__, totlen, len); 271 break; 272 } 273 274 if (m0 == NULL) 275 m0 = m = rtwn_rx_copy_to_mbuf(sc, stat, totlen); 276 else { 277 m->m_nextpkt = rtwn_rx_copy_to_mbuf(sc, stat, totlen); 278 if (m->m_nextpkt != NULL) 279 m = m->m_nextpkt; 280 } 281 282 /* Align next frame. */ 283 totlen = rtwn_usb_align_rx(uc, totlen, len); 284 buf += totlen; 285 len -= totlen; 286 } 287 288 if (len > 0) 289 (void)rtwn_rxeof_fragmented(uc, data, buf, len); 290 291 return (m0); 292 } 293 294 static struct mbuf * 295 rtwn_report_intr(struct rtwn_usb_softc *uc, struct usb_xfer *xfer, 296 struct rtwn_data *data) 297 { 298 struct rtwn_softc *sc = &uc->uc_sc; 299 struct ieee80211com *ic = &sc->sc_ic; 300 uint8_t *buf; 301 int len; 302 303 usbd_xfer_status(xfer, &len, NULL, NULL, NULL); 304 305 if (__predict_false(len < sizeof(struct rtwn_rx_stat_common) && 306 uc->uc_rx_stat_len == 0)) { 307 counter_u64_add(ic->ic_ierrors, 1); 308 return (NULL); 309 } 310 311 buf = data->buf; 312 if (uc->uc_rx_stat_len > 0) 313 return (rtwn_rxeof_fragmented(uc, data, data->buf, len)); 314 315 switch (rtwn_classify_intr(sc, buf, len)) { 316 case RTWN_RX_DATA: 317 return (rtwn_rxeof(sc, data, buf, len)); 318 case RTWN_RX_TX_REPORT: 319 if (sc->sc_ratectl != RTWN_RATECTL_NET80211) { 320 /* shouldn't happen */ 321 device_printf(sc->sc_dev, 322 "%s called while ratectl = %d!\n", 323 __func__, sc->sc_ratectl); 324 break; 325 } 326 327 RTWN_NT_LOCK(sc); 328 rtwn_handle_tx_report(sc, buf, len); 329 RTWN_NT_UNLOCK(sc); 330 331 #ifdef IEEE80211_SUPPORT_SUPERG 332 /* 333 * NB: this will executed only when 'report' bit is set. 334 */ 335 if (sc->sc_tx_n_active > 0 && --sc->sc_tx_n_active <= 1) 336 rtwn_cmd_sleepable(sc, NULL, 0, rtwn_ff_flush_all); 337 #endif 338 break; 339 case RTWN_RX_OTHER: 340 rtwn_handle_c2h_report(sc, buf, len); 341 break; 342 default: 343 /* NOTREACHED */ 344 KASSERT(0, ("unknown Rx classification code")); 345 break; 346 } 347 348 return (NULL); 349 } 350 351 static struct ieee80211_node * 352 rtwn_rx_frame(struct rtwn_softc *sc, struct mbuf *m) 353 { 354 struct rtwn_rx_stat_common stat; 355 356 /* Imitate PCIe layout. */ 357 m_copydata(m, 0, sizeof(stat), (caddr_t)&stat); 358 m_adj(m, sizeof(stat)); 359 360 return (rtwn_rx_common(sc, m, &stat)); 361 } 362 363 void 364 rtwn_bulk_rx_callback(struct usb_xfer *xfer, usb_error_t error) 365 { 366 struct epoch_tracker et; 367 struct rtwn_usb_softc *uc = usbd_xfer_softc(xfer); 368 struct rtwn_softc *sc = &uc->uc_sc; 369 struct ieee80211com *ic = &sc->sc_ic; 370 struct ieee80211_node *ni; 371 struct mbuf *m0, *m = NULL, *next; 372 struct rtwn_data *data; 373 374 RTWN_ASSERT_LOCKED(sc); 375 376 switch (USB_GET_STATE(xfer)) { 377 case USB_ST_TRANSFERRED: 378 data = STAILQ_FIRST(&uc->uc_rx_active); 379 if (data == NULL) 380 goto tr_setup; 381 STAILQ_REMOVE_HEAD(&uc->uc_rx_active, next); 382 m = rtwn_report_intr(uc, xfer, data); 383 STAILQ_INSERT_TAIL(&uc->uc_rx_inactive, data, next); 384 /* FALLTHROUGH */ 385 case USB_ST_SETUP: 386 tr_setup: 387 data = STAILQ_FIRST(&uc->uc_rx_inactive); 388 if (data == NULL) { 389 KASSERT(m == NULL, ("mbuf isn't NULL")); 390 goto finish; 391 } 392 STAILQ_REMOVE_HEAD(&uc->uc_rx_inactive, next); 393 STAILQ_INSERT_TAIL(&uc->uc_rx_active, data, next); 394 usbd_xfer_set_frame_data(xfer, 0, data->buf, 395 usbd_xfer_max_len(xfer)); 396 usbd_transfer_submit(xfer); 397 398 /* 399 * To avoid LOR we should unlock our private mutex here to call 400 * ieee80211_input() because here is at the end of a USB 401 * callback and safe to unlock. 402 */ 403 m0 = m; 404 while (m != NULL) { 405 M_ASSERTPKTHDR(m); 406 m->m_pkthdr.PH_loc.ptr = rtwn_rx_frame(sc, m); 407 m = m->m_nextpkt; 408 } 409 NET_EPOCH_ENTER(et); 410 RTWN_UNLOCK(sc); 411 m = m0; 412 while (m != NULL) { 413 next = m->m_nextpkt; 414 m->m_nextpkt = NULL; 415 416 ni = m->m_pkthdr.PH_loc.ptr; 417 m->m_pkthdr.PH_loc.ptr = NULL; 418 if (ni != NULL) { 419 (void)ieee80211_input_mimo(ni, m); 420 ieee80211_free_node(ni); 421 } else { 422 (void)ieee80211_input_mimo_all(ic, m); 423 } 424 m = next; 425 } 426 RTWN_LOCK(sc); 427 NET_EPOCH_EXIT(et); 428 break; 429 default: 430 /* needs it to the inactive queue due to a error. */ 431 data = STAILQ_FIRST(&uc->uc_rx_active); 432 if (data != NULL) { 433 STAILQ_REMOVE_HEAD(&uc->uc_rx_active, next); 434 STAILQ_INSERT_TAIL(&uc->uc_rx_inactive, data, next); 435 } 436 if (error != USB_ERR_CANCELLED) { 437 /* XXX restart device if frame was fragmented? */ 438 439 usbd_xfer_set_stall(xfer); 440 counter_u64_add(ic->ic_ierrors, 1); 441 goto tr_setup; 442 } 443 break; 444 } 445 finish: 446 /* Kick-start more transmit in case we stalled */ 447 rtwn_start(sc); 448 }
Cache object: 68e9c52fe43ea314677052462ae38512
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