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 61 void 62 rtwn_pci_dma_map_addr(void *arg, bus_dma_segment_t *segs, int nsegs, 63 int error) 64 { 65 66 if (error != 0) 67 return; 68 KASSERT(nsegs == 1, ("too many DMA segments, %d should be 1", nsegs)); 69 *(bus_addr_t *)arg = segs[0].ds_addr; 70 } 71 72 void 73 rtwn_pci_setup_rx_desc(struct rtwn_pci_softc *pc, 74 struct rtwn_rx_stat_pci *desc, bus_addr_t addr, size_t len, int idx) 75 { 76 77 memset(desc, 0, sizeof(*desc)); 78 desc->rxdw0 = htole32(SM(RTWN_RXDW0_PKTLEN, len) | 79 ((idx == RTWN_PCI_RX_LIST_COUNT - 1) ? RTWN_RXDW0_EOR : 0)); 80 desc->rxbufaddr = htole32(addr); 81 bus_space_barrier(pc->pc_st, pc->pc_sh, 0, pc->pc_mapsize, 82 BUS_SPACE_BARRIER_WRITE); 83 desc->rxdw0 |= htole32(RTWN_RXDW0_OWN); 84 } 85 86 static void 87 rtwn_pci_rx_frame(struct rtwn_pci_softc *pc) 88 { 89 struct epoch_tracker et; 90 struct rtwn_softc *sc = &pc->pc_sc; 91 struct rtwn_rx_ring *ring = &pc->rx_ring; 92 struct rtwn_rx_stat_pci *rx_desc = &ring->desc[ring->cur]; 93 struct rtwn_rx_data *rx_data = &ring->rx_data[ring->cur]; 94 struct ieee80211com *ic = &sc->sc_ic; 95 struct ieee80211_node *ni; 96 uint32_t rxdw0; 97 struct mbuf *m, *m1; 98 int infosz, pktlen, shift, error; 99 100 /* Dump Rx descriptor. */ 101 RTWN_DPRINTF(sc, RTWN_DEBUG_RECV_DESC, 102 "%s: dw: 0 %08X, 1 %08X, 2 %08X, 3 %08X, 4 %08X, tsfl %08X, " 103 "addr: %08X (64: %08X)\n", 104 __func__, le32toh(rx_desc->rxdw0), le32toh(rx_desc->rxdw1), 105 le32toh(rx_desc->rxdw2), le32toh(rx_desc->rxdw3), 106 le32toh(rx_desc->rxdw4), le32toh(rx_desc->tsf_low), 107 le32toh(rx_desc->rxbufaddr), le32toh(rx_desc->rxbufaddr64)); 108 109 rxdw0 = le32toh(rx_desc->rxdw0); 110 if (__predict_false(rxdw0 & (RTWN_RXDW0_CRCERR | RTWN_RXDW0_ICVERR))) { 111 /* 112 * This should not happen since we setup our Rx filter 113 * to not receive these frames. 114 */ 115 RTWN_DPRINTF(sc, RTWN_DEBUG_RECV, 116 "%s: RX flags error (%s)\n", __func__, 117 rxdw0 & RTWN_RXDW0_CRCERR ? "CRC" : "ICV"); 118 goto fail; 119 } 120 121 pktlen = MS(rxdw0, RTWN_RXDW0_PKTLEN); 122 if (__predict_false(pktlen < sizeof(struct ieee80211_frame_ack) || 123 pktlen > MJUMPAGESIZE)) { 124 RTWN_DPRINTF(sc, RTWN_DEBUG_RECV, 125 "%s: frame is too short/long: %d\n", __func__, pktlen); 126 goto fail; 127 } 128 129 infosz = MS(rxdw0, RTWN_RXDW0_INFOSZ) * 8; 130 shift = MS(rxdw0, RTWN_RXDW0_SHIFT); 131 132 m1 = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, MJUMPAGESIZE); 133 if (__predict_false(m1 == NULL)) { 134 device_printf(sc->sc_dev, "%s: could not allocate RX mbuf\n", 135 __func__); 136 goto fail; 137 } 138 bus_dmamap_sync(ring->data_dmat, rx_data->map, BUS_DMASYNC_POSTREAD); 139 bus_dmamap_unload(ring->data_dmat, rx_data->map); 140 141 error = bus_dmamap_load(ring->data_dmat, rx_data->map, mtod(m1, void *), 142 MJUMPAGESIZE, rtwn_pci_dma_map_addr, &rx_data->paddr, 0); 143 if (error != 0) { 144 m_freem(m1); 145 146 error = bus_dmamap_load(ring->data_dmat, rx_data->map, 147 mtod(rx_data->m, void *), MJUMPAGESIZE, 148 rtwn_pci_dma_map_addr, &rx_data->paddr, BUS_DMA_NOWAIT); 149 if (error != 0) 150 panic("%s: could not load old RX mbuf", 151 device_get_name(sc->sc_dev)); 152 153 goto fail; 154 } 155 156 /* Finalize mbuf. */ 157 m = rx_data->m; 158 rx_data->m = m1; 159 m->m_pkthdr.len = m->m_len = pktlen + infosz + shift; 160 161 ni = rtwn_rx_common(sc, m, rx_desc); 162 163 RTWN_DPRINTF(sc, RTWN_DEBUG_RECV, 164 "%s: Rx frame len %d, infosz %d, shift %d\n", 165 __func__, pktlen, infosz, shift); 166 167 /* Send the frame to the 802.11 layer. */ 168 RTWN_UNLOCK(sc); 169 170 NET_EPOCH_ENTER(et); 171 if (ni != NULL) { 172 (void)ieee80211_input_mimo(ni, m); 173 /* Node is no longer needed. */ 174 ieee80211_free_node(ni); 175 } else 176 (void)ieee80211_input_mimo_all(ic, m); 177 NET_EPOCH_EXIT(et); 178 179 RTWN_LOCK(sc); 180 181 return; 182 183 fail: 184 counter_u64_add(ic->ic_ierrors, 1); 185 } 186 187 static int 188 rtwn_pci_rx_buf_copy(struct rtwn_pci_softc *pc) 189 { 190 struct rtwn_rx_ring *ring = &pc->rx_ring; 191 struct rtwn_rx_stat_pci *rx_desc = &ring->desc[ring->cur]; 192 struct rtwn_rx_data *rx_data = &ring->rx_data[ring->cur]; 193 uint32_t rxdw0; 194 int desc_size, pktlen; 195 196 /* 197 * NB: tx_report() / c2h_report() expects to see USB Rx 198 * descriptor - same as for PCIe, but without rxbufaddr* fields. 199 */ 200 desc_size = sizeof(struct rtwn_rx_stat_common); 201 KASSERT(sizeof(pc->pc_rx_buf) >= desc_size, 202 ("adjust size for PCIe Rx buffer!")); 203 204 memcpy(pc->pc_rx_buf, rx_desc, desc_size); 205 206 rxdw0 = le32toh(rx_desc->rxdw0); 207 pktlen = MS(rxdw0, RTWN_RXDW0_PKTLEN); 208 209 if (pktlen > sizeof(pc->pc_rx_buf) - desc_size) 210 { 211 /* Looks like an ordinary Rx frame. */ 212 return (desc_size); 213 } 214 215 bus_dmamap_sync(ring->data_dmat, rx_data->map, BUS_DMASYNC_POSTREAD); 216 memcpy(pc->pc_rx_buf + desc_size, mtod(rx_data->m, void *), pktlen); 217 218 return (desc_size + pktlen); 219 } 220 221 static void 222 rtwn_pci_tx_report(struct rtwn_pci_softc *pc, int len) 223 { 224 struct rtwn_softc *sc = &pc->pc_sc; 225 226 if (sc->sc_ratectl != RTWN_RATECTL_NET80211) { 227 /* shouldn't happen */ 228 device_printf(sc->sc_dev, 229 "%s called while ratectl = %d!\n", 230 __func__, sc->sc_ratectl); 231 return; 232 } 233 234 RTWN_NT_LOCK(sc); 235 rtwn_handle_tx_report(sc, pc->pc_rx_buf, len); 236 RTWN_NT_UNLOCK(sc); 237 238 #ifdef IEEE80211_SUPPORT_SUPERG 239 /* 240 * NB: this will executed only when 'report' bit is set. 241 */ 242 if (sc->sc_tx_n_active > 0 && --sc->sc_tx_n_active <= 1) 243 rtwn_cmd_sleepable(sc, NULL, 0, rtwn_ff_flush_all); 244 #endif 245 } 246 247 static void 248 rtwn_pci_c2h_report(struct rtwn_pci_softc *pc, int len) 249 { 250 rtwn_handle_c2h_report(&pc->pc_sc, pc->pc_rx_buf, len); 251 } 252 253 static void 254 rtwn_pci_tx_done(struct rtwn_softc *sc, int qid) 255 { 256 struct rtwn_pci_softc *pc = RTWN_PCI_SOFTC(sc); 257 struct rtwn_tx_ring *ring = &pc->tx_ring[qid]; 258 struct rtwn_tx_desc_common *desc; 259 struct rtwn_tx_data *data; 260 261 RTWN_DPRINTF(sc, RTWN_DEBUG_INTR, "%s: qid %d, last %d, cur %d\n", 262 __func__, qid, ring->last, ring->cur); 263 264 bus_dmamap_sync(ring->desc_dmat, ring->desc_map, 265 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); 266 267 while(ring->last != ring->cur) { 268 data = &ring->tx_data[ring->last]; 269 desc = (struct rtwn_tx_desc_common *) 270 ((uint8_t *)ring->desc + sc->txdesc_len * ring->last); 271 272 KASSERT(data->m != NULL, ("no mbuf")); 273 274 if (desc->flags0 & RTWN_FLAGS0_OWN) 275 break; 276 277 /* Unmap and free mbuf. */ 278 bus_dmamap_sync(ring->data_dmat, data->map, 279 BUS_DMASYNC_POSTWRITE); 280 bus_dmamap_unload(ring->data_dmat, data->map); 281 282 if (data->ni != NULL) { /* not a beacon frame */ 283 ieee80211_tx_complete(data->ni, data->m, 0); 284 285 data->ni = NULL; 286 ring->queued--; 287 KASSERT(ring->queued >= 0, 288 ("ring->queued (qid %d) underflow!\n", qid)); 289 } else 290 m_freem(data->m); 291 292 data->m = NULL; 293 ring->last = (ring->last + 1) % RTWN_PCI_TX_LIST_COUNT; 294 #ifndef D4054 295 if (ring->queued > 0) 296 sc->sc_tx_timer = 5; 297 else 298 sc->sc_tx_timer = 0; 299 #endif 300 } 301 302 if ((sc->qfullmsk & (1 << qid)) != 0 && 303 ring->queued < (RTWN_PCI_TX_LIST_COUNT - 1)) { 304 sc->qfullmsk &= ~(1 << qid); 305 rtwn_start(sc); 306 } 307 308 #ifdef IEEE80211_SUPPORT_SUPERG 309 /* 310 * If the TX active queue drops below a certain 311 * threshold, ensure we age fast-frames out so they're 312 * transmitted. 313 */ 314 if (sc->sc_ratectl != RTWN_RATECTL_NET80211 && ring->queued <= 1) { 315 /* 316 * XXX TODO: just make this a callout timer schedule 317 * so we can flush the FF staging queue if we're 318 * approaching idle. 319 */ 320 rtwn_cmd_sleepable(sc, NULL, 0, rtwn_ff_flush_all); 321 } 322 #endif 323 } 324 325 static void 326 rtwn_pci_rx_done(struct rtwn_softc *sc) 327 { 328 struct rtwn_pci_softc *pc = RTWN_PCI_SOFTC(sc); 329 struct rtwn_rx_ring *ring = &pc->rx_ring; 330 struct rtwn_rx_stat_pci *rx_desc; 331 struct rtwn_rx_data *rx_data; 332 int len; 333 334 bus_dmamap_sync(ring->desc_dmat, ring->desc_map, BUS_DMASYNC_POSTREAD); 335 336 for (;;) { 337 rx_desc = &ring->desc[ring->cur]; 338 rx_data = &ring->rx_data[ring->cur]; 339 340 if (le32toh(rx_desc->rxdw0) & RTWN_RXDW0_OWN) 341 break; 342 343 len = rtwn_pci_rx_buf_copy(pc); 344 345 switch (rtwn_classify_intr(sc, pc->pc_rx_buf, len)) { 346 case RTWN_RX_DATA: 347 rtwn_pci_rx_frame(pc); 348 break; 349 case RTWN_RX_TX_REPORT: 350 rtwn_pci_tx_report(pc, len); 351 break; 352 case RTWN_RX_OTHER: 353 rtwn_pci_c2h_report(pc, len); 354 break; 355 default: 356 /* NOTREACHED */ 357 KASSERT(0, ("unknown Rx classification code")); 358 break; 359 } 360 361 /* Update / reset RX descriptor (and set OWN bit). */ 362 rtwn_pci_setup_rx_desc(pc, rx_desc, rx_data->paddr, 363 MJUMPAGESIZE, ring->cur); 364 365 if (!(sc->sc_flags & RTWN_RUNNING)) 366 return; 367 368 /* NB: device can reuse current descriptor. */ 369 bus_dmamap_sync(ring->desc_dmat, ring->desc_map, 370 BUS_DMASYNC_POSTREAD); 371 372 if (le32toh(rx_desc->rxdw0) & RTWN_RXDW0_OWN) 373 ring->cur = (ring->cur + 1) % RTWN_PCI_RX_LIST_COUNT; 374 } 375 } 376 377 void 378 rtwn_pci_intr(void *arg) 379 { 380 struct rtwn_softc *sc = arg; 381 struct rtwn_pci_softc *pc = RTWN_PCI_SOFTC(sc); 382 int i, status, tx_rings; 383 384 RTWN_LOCK(sc); 385 status = rtwn_pci_get_intr_status(pc, &tx_rings); 386 RTWN_DPRINTF(sc, RTWN_DEBUG_INTR, "%s: status %08X, tx_rings %08X\n", 387 __func__, status, tx_rings); 388 if (status == 0 && tx_rings == 0) 389 goto unlock; 390 391 if (status & (RTWN_PCI_INTR_RX | RTWN_PCI_INTR_TX_REPORT)) { 392 rtwn_pci_rx_done(sc); 393 if (!(sc->sc_flags & RTWN_RUNNING)) 394 goto unlock; 395 } 396 397 if (tx_rings != 0) 398 for (i = 0; i < RTWN_PCI_NTXQUEUES; i++) 399 if (tx_rings & (1 << i)) 400 rtwn_pci_tx_done(sc, i); 401 402 if (sc->sc_flags & RTWN_RUNNING) 403 rtwn_pci_enable_intr(pc); 404 unlock: 405 RTWN_UNLOCK(sc); 406 } 407