1 /* $OpenBSD: if_rtwn.c,v 1.6 2015/08/28 00:03:53 deraadt Exp $ */ 2 3 /*- 4 * Copyright (c) 2010 Damien Bergamini <damien.bergamini@free.fr> 5 * Copyright (c) 2015 Stefan Sperling <stsp@openbsd.org> 6 * Copyright (c) 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 #include <sys/epoch.h> 39 40 #include <machine/bus.h> 41 #include <machine/resource.h> 42 #include <sys/rman.h> 43 44 #include <net/if.h> 45 #include <net/ethernet.h> 46 #include <net/if_media.h> 47 48 #include <net80211/ieee80211_var.h> 49 50 #include <dev/rtwn/if_rtwnreg.h> 51 #include <dev/rtwn/if_rtwnvar.h> 52 #include <dev/rtwn/if_rtwn_debug.h> 53 #include <dev/rtwn/if_rtwn_rx.h> 54 #include <dev/rtwn/if_rtwn_task.h> 55 #include <dev/rtwn/if_rtwn_tx.h> 56 57 #include <dev/rtwn/pci/rtwn_pci_var.h> 58 #include <dev/rtwn/pci/rtwn_pci_rx.h> 59 60 void 61 rtwn_pci_dma_map_addr(void *arg, bus_dma_segment_t *segs, int nsegs, 62 int error) 63 { 64 65 if (error != 0) 66 return; 67 KASSERT(nsegs == 1, ("too many DMA segments, %d should be 1", nsegs)); 68 *(bus_addr_t *)arg = segs[0].ds_addr; 69 } 70 71 void 72 rtwn_pci_setup_rx_desc(struct rtwn_pci_softc *pc, 73 struct rtwn_rx_stat_pci *desc, bus_addr_t addr, size_t len, int idx) 74 { 75 76 memset(desc, 0, sizeof(*desc)); 77 desc->rxdw0 = htole32(SM(RTWN_RXDW0_PKTLEN, len) | 78 ((idx == RTWN_PCI_RX_LIST_COUNT - 1) ? RTWN_RXDW0_EOR : 0)); 79 desc->rxbufaddr = htole32(addr); 80 bus_space_barrier(pc->pc_st, pc->pc_sh, 0, pc->pc_mapsize, 81 BUS_SPACE_BARRIER_WRITE); 82 desc->rxdw0 |= htole32(RTWN_RXDW0_OWN); 83 } 84 85 static void 86 rtwn_pci_rx_frame(struct rtwn_pci_softc *pc) 87 { 88 struct epoch_tracker et; 89 struct rtwn_softc *sc = &pc->pc_sc; 90 struct rtwn_rx_ring *ring = &pc->rx_ring; 91 struct rtwn_rx_stat_pci *rx_desc = &ring->desc[ring->cur]; 92 struct rtwn_rx_data *rx_data = &ring->rx_data[ring->cur]; 93 struct ieee80211com *ic = &sc->sc_ic; 94 struct ieee80211_node *ni; 95 uint32_t rxdw0; 96 struct mbuf *m, *m1; 97 int infosz, pktlen, shift, error; 98 99 /* Dump Rx descriptor. */ 100 RTWN_DPRINTF(sc, RTWN_DEBUG_RECV_DESC, 101 "%s: dw: 0 %08X, 1 %08X, 2 %08X, 3 %08X, 4 %08X, tsfl %08X, " 102 "addr: %08X (64: %08X)\n", 103 __func__, le32toh(rx_desc->rxdw0), le32toh(rx_desc->rxdw1), 104 le32toh(rx_desc->rxdw2), le32toh(rx_desc->rxdw3), 105 le32toh(rx_desc->rxdw4), le32toh(rx_desc->tsf_low), 106 le32toh(rx_desc->rxbufaddr), le32toh(rx_desc->rxbufaddr64)); 107 108 rxdw0 = le32toh(rx_desc->rxdw0); 109 if (__predict_false(rxdw0 & (RTWN_RXDW0_CRCERR | RTWN_RXDW0_ICVERR))) { 110 /* 111 * This should not happen since we setup our Rx filter 112 * to not receive these frames. 113 */ 114 RTWN_DPRINTF(sc, RTWN_DEBUG_RECV, 115 "%s: RX flags error (%s)\n", __func__, 116 rxdw0 & RTWN_RXDW0_CRCERR ? "CRC" : "ICV"); 117 goto fail; 118 } 119 120 pktlen = MS(rxdw0, RTWN_RXDW0_PKTLEN); 121 if (__predict_false(pktlen < sizeof(struct ieee80211_frame_ack) || 122 pktlen > MJUMPAGESIZE)) { 123 RTWN_DPRINTF(sc, RTWN_DEBUG_RECV, 124 "%s: frame is too short/long: %d\n", __func__, pktlen); 125 goto fail; 126 } 127 128 infosz = MS(rxdw0, RTWN_RXDW0_INFOSZ) * 8; 129 shift = MS(rxdw0, RTWN_RXDW0_SHIFT); 130 131 m1 = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, MJUMPAGESIZE); 132 if (__predict_false(m1 == NULL)) { 133 device_printf(sc->sc_dev, "%s: could not allocate RX mbuf\n", 134 __func__); 135 goto fail; 136 } 137 bus_dmamap_sync(ring->data_dmat, rx_data->map, BUS_DMASYNC_POSTREAD); 138 bus_dmamap_unload(ring->data_dmat, rx_data->map); 139 140 error = bus_dmamap_load(ring->data_dmat, rx_data->map, mtod(m1, void *), 141 MJUMPAGESIZE, rtwn_pci_dma_map_addr, &rx_data->paddr, 0); 142 if (error != 0) { 143 m_freem(m1); 144 145 error = bus_dmamap_load(ring->data_dmat, rx_data->map, 146 mtod(rx_data->m, void *), MJUMPAGESIZE, 147 rtwn_pci_dma_map_addr, &rx_data->paddr, BUS_DMA_NOWAIT); 148 if (error != 0) 149 panic("%s: could not load old RX mbuf", 150 device_get_name(sc->sc_dev)); 151 152 goto fail; 153 } 154 155 /* Finalize mbuf. */ 156 m = rx_data->m; 157 rx_data->m = m1; 158 m->m_pkthdr.len = m->m_len = pktlen + infosz + shift; 159 160 ni = rtwn_rx_common(sc, m, rx_desc); 161 162 RTWN_DPRINTF(sc, RTWN_DEBUG_RECV, 163 "%s: Rx frame len %d, infosz %d, shift %d\n", 164 __func__, pktlen, infosz, shift); 165 166 /* Send the frame to the 802.11 layer. */ 167 RTWN_UNLOCK(sc); 168 169 NET_EPOCH_ENTER(et); 170 if (ni != NULL) { 171 (void)ieee80211_input_mimo(ni, m); 172 /* Node is no longer needed. */ 173 ieee80211_free_node(ni); 174 } else 175 (void)ieee80211_input_mimo_all(ic, m); 176 NET_EPOCH_EXIT(et); 177 178 RTWN_LOCK(sc); 179 180 return; 181 182 fail: 183 counter_u64_add(ic->ic_ierrors, 1); 184 } 185 186 static int 187 rtwn_pci_rx_buf_copy(struct rtwn_pci_softc *pc) 188 { 189 struct rtwn_rx_ring *ring = &pc->rx_ring; 190 struct rtwn_rx_stat_pci *rx_desc = &ring->desc[ring->cur]; 191 struct rtwn_rx_data *rx_data = &ring->rx_data[ring->cur]; 192 uint32_t rxdw0; 193 int desc_size, pktlen; 194 195 /* 196 * NB: tx_report() / c2h_report() expects to see USB Rx 197 * descriptor - same as for PCIe, but without rxbufaddr* fields. 198 */ 199 desc_size = sizeof(struct rtwn_rx_stat_common); 200 KASSERT(sizeof(pc->pc_rx_buf) >= desc_size, 201 ("adjust size for PCIe Rx buffer!")); 202 203 memcpy(pc->pc_rx_buf, rx_desc, desc_size); 204 205 rxdw0 = le32toh(rx_desc->rxdw0); 206 pktlen = MS(rxdw0, RTWN_RXDW0_PKTLEN); 207 208 if (pktlen > sizeof(pc->pc_rx_buf) - desc_size) 209 { 210 /* Looks like an ordinary Rx frame. */ 211 return (desc_size); 212 } 213 214 bus_dmamap_sync(ring->data_dmat, rx_data->map, BUS_DMASYNC_POSTREAD); 215 memcpy(pc->pc_rx_buf + desc_size, mtod(rx_data->m, void *), pktlen); 216 217 return (desc_size + pktlen); 218 } 219 220 static void 221 rtwn_pci_tx_report(struct rtwn_pci_softc *pc, int len) 222 { 223 struct rtwn_softc *sc = &pc->pc_sc; 224 225 if (sc->sc_ratectl != RTWN_RATECTL_NET80211) { 226 /* shouldn't happen */ 227 device_printf(sc->sc_dev, 228 "%s called while ratectl = %d!\n", 229 __func__, sc->sc_ratectl); 230 return; 231 } 232 233 RTWN_NT_LOCK(sc); 234 rtwn_handle_tx_report(sc, pc->pc_rx_buf, len); 235 RTWN_NT_UNLOCK(sc); 236 237 #ifdef IEEE80211_SUPPORT_SUPERG 238 /* 239 * NB: this will executed only when 'report' bit is set. 240 */ 241 if (sc->sc_tx_n_active > 0 && --sc->sc_tx_n_active <= 1) 242 rtwn_cmd_sleepable(sc, NULL, 0, rtwn_ff_flush_all); 243 #endif 244 } 245 246 static void 247 rtwn_pci_c2h_report(struct rtwn_pci_softc *pc, int len) 248 { 249 rtwn_handle_c2h_report(&pc->pc_sc, pc->pc_rx_buf, len); 250 } 251 252 static void 253 rtwn_pci_tx_done(struct rtwn_softc *sc, int qid) 254 { 255 struct rtwn_pci_softc *pc = RTWN_PCI_SOFTC(sc); 256 struct rtwn_tx_ring *ring = &pc->tx_ring[qid]; 257 struct rtwn_tx_desc_common *desc; 258 struct rtwn_tx_data *data; 259 260 RTWN_DPRINTF(sc, RTWN_DEBUG_INTR, "%s: qid %d, last %d, cur %d\n", 261 __func__, qid, ring->last, ring->cur); 262 263 bus_dmamap_sync(ring->desc_dmat, ring->desc_map, 264 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); 265 266 while(ring->last != ring->cur) { 267 data = &ring->tx_data[ring->last]; 268 desc = (struct rtwn_tx_desc_common *) 269 ((uint8_t *)ring->desc + sc->txdesc_len * ring->last); 270 271 KASSERT(data->m != NULL, ("no mbuf")); 272 273 if (desc->flags0 & RTWN_FLAGS0_OWN) 274 break; 275 276 /* Unmap and free mbuf. */ 277 bus_dmamap_sync(ring->data_dmat, data->map, 278 BUS_DMASYNC_POSTWRITE); 279 bus_dmamap_unload(ring->data_dmat, data->map); 280 281 if (data->ni != NULL) { /* not a beacon frame */ 282 ieee80211_tx_complete(data->ni, data->m, 0); 283 284 data->ni = NULL; 285 ring->queued--; 286 KASSERT(ring->queued >= 0, 287 ("ring->queued (qid %d) underflow!\n", qid)); 288 } else 289 m_freem(data->m); 290 291 data->m = NULL; 292 ring->last = (ring->last + 1) % RTWN_PCI_TX_LIST_COUNT; 293 #ifndef D4054 294 if (ring->queued > 0) 295 sc->sc_tx_timer = 5; 296 else 297 sc->sc_tx_timer = 0; 298 #endif 299 } 300 301 if ((sc->qfullmsk & (1 << qid)) != 0 && 302 ring->queued < (RTWN_PCI_TX_LIST_COUNT - 1)) { 303 sc->qfullmsk &= ~(1 << qid); 304 rtwn_start(sc); 305 } 306 307 #ifdef IEEE80211_SUPPORT_SUPERG 308 /* 309 * If the TX active queue drops below a certain 310 * threshold, ensure we age fast-frames out so they're 311 * transmitted. 312 */ 313 if (sc->sc_ratectl != RTWN_RATECTL_NET80211 && ring->queued <= 1) { 314 /* 315 * XXX TODO: just make this a callout timer schedule 316 * so we can flush the FF staging queue if we're 317 * approaching idle. 318 */ 319 rtwn_cmd_sleepable(sc, NULL, 0, rtwn_ff_flush_all); 320 } 321 #endif 322 } 323 324 static void 325 rtwn_pci_rx_done(struct rtwn_softc *sc) 326 { 327 struct rtwn_pci_softc *pc = RTWN_PCI_SOFTC(sc); 328 struct rtwn_rx_ring *ring = &pc->rx_ring; 329 struct rtwn_rx_stat_pci *rx_desc; 330 struct rtwn_rx_data *rx_data; 331 int len; 332 333 bus_dmamap_sync(ring->desc_dmat, ring->desc_map, BUS_DMASYNC_POSTREAD); 334 335 for (;;) { 336 rx_desc = &ring->desc[ring->cur]; 337 rx_data = &ring->rx_data[ring->cur]; 338 339 if (le32toh(rx_desc->rxdw0) & RTWN_RXDW0_OWN) 340 break; 341 342 len = rtwn_pci_rx_buf_copy(pc); 343 344 switch (rtwn_classify_intr(sc, pc->pc_rx_buf, len)) { 345 case RTWN_RX_DATA: 346 rtwn_pci_rx_frame(pc); 347 break; 348 case RTWN_RX_TX_REPORT: 349 rtwn_pci_tx_report(pc, len); 350 break; 351 case RTWN_RX_OTHER: 352 rtwn_pci_c2h_report(pc, len); 353 break; 354 default: 355 /* NOTREACHED */ 356 KASSERT(0, ("unknown Rx classification code")); 357 break; 358 } 359 360 /* Update / reset RX descriptor (and set OWN bit). */ 361 rtwn_pci_setup_rx_desc(pc, rx_desc, rx_data->paddr, 362 MJUMPAGESIZE, ring->cur); 363 364 if (!(sc->sc_flags & RTWN_RUNNING)) 365 return; 366 367 /* NB: device can reuse current descriptor. */ 368 bus_dmamap_sync(ring->desc_dmat, ring->desc_map, 369 BUS_DMASYNC_POSTREAD); 370 371 if (le32toh(rx_desc->rxdw0) & RTWN_RXDW0_OWN) 372 ring->cur = (ring->cur + 1) % RTWN_PCI_RX_LIST_COUNT; 373 } 374 } 375 376 void 377 rtwn_pci_intr(void *arg) 378 { 379 struct rtwn_softc *sc = arg; 380 struct rtwn_pci_softc *pc = RTWN_PCI_SOFTC(sc); 381 int i, status, tx_rings; 382 383 RTWN_LOCK(sc); 384 status = rtwn_pci_get_intr_status(pc, &tx_rings); 385 RTWN_DPRINTF(sc, RTWN_DEBUG_INTR, "%s: status %08X, tx_rings %08X\n", 386 __func__, status, tx_rings); 387 if (status == 0 && tx_rings == 0) 388 goto unlock; 389 390 if (status & (RTWN_PCI_INTR_RX | RTWN_PCI_INTR_TX_REPORT)) { 391 rtwn_pci_rx_done(sc); 392 if (!(sc->sc_flags & RTWN_RUNNING)) 393 goto unlock; 394 } 395 396 if (tx_rings != 0) 397 for (i = 0; i < RTWN_PCI_NTXQUEUES; i++) 398 if (tx_rings & (1 << i)) 399 rtwn_pci_tx_done(sc, i); 400 401 if (sc->sc_flags & RTWN_RUNNING) 402 rtwn_pci_enable_intr(pc); 403 unlock: 404 RTWN_UNLOCK(sc); 405 } 406