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: stable/12/sys/dev/rtwn/pci/rtwn_pci_rx.c 365608 2020-09-10 19:00:17Z bz $");
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 <machine/bus.h>
40 #include <machine/resource.h>
41 #include <sys/rman.h>
42
43 #include <net/if.h>
44 #include <net/ethernet.h>
45 #include <net/if_media.h>
46
47 #include <net80211/ieee80211_var.h>
48
49 #include <dev/rtwn/if_rtwnreg.h>
50 #include <dev/rtwn/if_rtwnvar.h>
51 #include <dev/rtwn/if_rtwn_debug.h>
52 #include <dev/rtwn/if_rtwn_rx.h>
53 #include <dev/rtwn/if_rtwn_task.h>
54 #include <dev/rtwn/if_rtwn_tx.h>
55
56 #include <dev/rtwn/pci/rtwn_pci_var.h>
57 #include <dev/rtwn/pci/rtwn_pci_rx.h>
58
59 void
rtwn_pci_dma_map_addr(void * arg,bus_dma_segment_t * segs,int nsegs,int error)60 rtwn_pci_dma_map_addr(void *arg, bus_dma_segment_t *segs, int nsegs,
61 int error)
62 {
63
64 if (error != 0)
65 return;
66 KASSERT(nsegs == 1, ("too many DMA segments, %d should be 1", nsegs));
67 *(bus_addr_t *)arg = segs[0].ds_addr;
68 }
69
70 void
rtwn_pci_setup_rx_desc(struct rtwn_pci_softc * pc,struct rtwn_rx_stat_pci * desc,bus_addr_t addr,size_t len,int idx)71 rtwn_pci_setup_rx_desc(struct rtwn_pci_softc *pc,
72 struct rtwn_rx_stat_pci *desc, bus_addr_t addr, size_t len, int idx)
73 {
74
75 memset(desc, 0, sizeof(*desc));
76 desc->rxdw0 = htole32(SM(RTWN_RXDW0_PKTLEN, len) |
77 ((idx == RTWN_PCI_RX_LIST_COUNT - 1) ? RTWN_RXDW0_EOR : 0));
78 desc->rxbufaddr = htole32(addr);
79 bus_space_barrier(pc->pc_st, pc->pc_sh, 0, pc->pc_mapsize,
80 BUS_SPACE_BARRIER_WRITE);
81 desc->rxdw0 |= htole32(RTWN_RXDW0_OWN);
82 }
83
84 static void
rtwn_pci_rx_frame(struct rtwn_pci_softc * pc)85 rtwn_pci_rx_frame(struct rtwn_pci_softc *pc)
86 {
87 struct rtwn_softc *sc = &pc->pc_sc;
88 struct rtwn_rx_ring *ring = &pc->rx_ring;
89 struct rtwn_rx_stat_pci *rx_desc = &ring->desc[ring->cur];
90 struct rtwn_rx_data *rx_data = &ring->rx_data[ring->cur];
91 struct ieee80211com *ic = &sc->sc_ic;
92 struct ieee80211_node *ni;
93 uint32_t rxdw0;
94 struct mbuf *m, *m1;
95 int infosz, pktlen, shift, error;
96
97 /* Dump Rx descriptor. */
98 RTWN_DPRINTF(sc, RTWN_DEBUG_RECV_DESC,
99 "%s: dw: 0 %08X, 1 %08X, 2 %08X, 3 %08X, 4 %08X, tsfl %08X, "
100 "addr: %08X (64: %08X)\n",
101 __func__, le32toh(rx_desc->rxdw0), le32toh(rx_desc->rxdw1),
102 le32toh(rx_desc->rxdw2), le32toh(rx_desc->rxdw3),
103 le32toh(rx_desc->rxdw4), le32toh(rx_desc->tsf_low),
104 le32toh(rx_desc->rxbufaddr), le32toh(rx_desc->rxbufaddr64));
105
106 rxdw0 = le32toh(rx_desc->rxdw0);
107 if (__predict_false(rxdw0 & (RTWN_RXDW0_CRCERR | RTWN_RXDW0_ICVERR))) {
108 /*
109 * This should not happen since we setup our Rx filter
110 * to not receive these frames.
111 */
112 RTWN_DPRINTF(sc, RTWN_DEBUG_RECV,
113 "%s: RX flags error (%s)\n", __func__,
114 rxdw0 & RTWN_RXDW0_CRCERR ? "CRC" : "ICV");
115 goto fail;
116 }
117
118 pktlen = MS(rxdw0, RTWN_RXDW0_PKTLEN);
119 if (__predict_false(pktlen < sizeof(struct ieee80211_frame_ack) ||
120 pktlen > MJUMPAGESIZE)) {
121 RTWN_DPRINTF(sc, RTWN_DEBUG_RECV,
122 "%s: frame is too short/long: %d\n", __func__, pktlen);
123 goto fail;
124 }
125
126 infosz = MS(rxdw0, RTWN_RXDW0_INFOSZ) * 8;
127 shift = MS(rxdw0, RTWN_RXDW0_SHIFT);
128
129 m1 = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, MJUMPAGESIZE);
130 if (__predict_false(m1 == NULL)) {
131 device_printf(sc->sc_dev, "%s: could not allocate RX mbuf\n",
132 __func__);
133 goto fail;
134 }
135 bus_dmamap_sync(ring->data_dmat, rx_data->map, BUS_DMASYNC_POSTREAD);
136 bus_dmamap_unload(ring->data_dmat, rx_data->map);
137
138 error = bus_dmamap_load(ring->data_dmat, rx_data->map, mtod(m1, void *),
139 MJUMPAGESIZE, rtwn_pci_dma_map_addr, &rx_data->paddr, 0);
140 if (error != 0) {
141 m_freem(m1);
142
143 error = bus_dmamap_load(ring->data_dmat, rx_data->map,
144 mtod(rx_data->m, void *), MJUMPAGESIZE,
145 rtwn_pci_dma_map_addr, &rx_data->paddr, BUS_DMA_NOWAIT);
146 if (error != 0)
147 panic("%s: could not load old RX mbuf",
148 device_get_name(sc->sc_dev));
149
150 goto fail;
151 }
152
153 /* Finalize mbuf. */
154 m = rx_data->m;
155 rx_data->m = m1;
156 m->m_pkthdr.len = m->m_len = pktlen + infosz + shift;
157
158 ni = rtwn_rx_common(sc, m, rx_desc);
159
160 RTWN_DPRINTF(sc, RTWN_DEBUG_RECV,
161 "%s: Rx frame len %d, infosz %d, shift %d\n",
162 __func__, pktlen, infosz, shift);
163
164 /* Send the frame to the 802.11 layer. */
165 RTWN_UNLOCK(sc);
166 if (ni != NULL) {
167 (void)ieee80211_input_mimo(ni, m);
168 /* Node is no longer needed. */
169 ieee80211_free_node(ni);
170 } else
171 (void)ieee80211_input_mimo_all(ic, m);
172
173 RTWN_LOCK(sc);
174
175 return;
176
177 fail:
178 counter_u64_add(ic->ic_ierrors, 1);
179 }
180
181 static int
rtwn_pci_rx_buf_copy(struct rtwn_pci_softc * pc)182 rtwn_pci_rx_buf_copy(struct rtwn_pci_softc *pc)
183 {
184 struct rtwn_rx_ring *ring = &pc->rx_ring;
185 struct rtwn_rx_stat_pci *rx_desc = &ring->desc[ring->cur];
186 struct rtwn_rx_data *rx_data = &ring->rx_data[ring->cur];
187 uint32_t rxdw0;
188 int desc_size, pktlen;
189
190 /*
191 * NB: tx_report() / c2h_report() expects to see USB Rx
192 * descriptor - same as for PCIe, but without rxbufaddr* fields.
193 */
194 desc_size = sizeof(struct rtwn_rx_stat_common);
195 KASSERT(sizeof(pc->pc_rx_buf) >= desc_size,
196 ("adjust size for PCIe Rx buffer!"));
197
198 memcpy(pc->pc_rx_buf, rx_desc, desc_size);
199
200 rxdw0 = le32toh(rx_desc->rxdw0);
201 pktlen = MS(rxdw0, RTWN_RXDW0_PKTLEN);
202
203 if (pktlen > sizeof(pc->pc_rx_buf) - desc_size)
204 {
205 /* Looks like an ordinary Rx frame. */
206 return (desc_size);
207 }
208
209 bus_dmamap_sync(ring->data_dmat, rx_data->map, BUS_DMASYNC_POSTREAD);
210 memcpy(pc->pc_rx_buf + desc_size, mtod(rx_data->m, void *), pktlen);
211
212 return (desc_size + pktlen);
213 }
214
215 static void
rtwn_pci_tx_report(struct rtwn_pci_softc * pc,int len)216 rtwn_pci_tx_report(struct rtwn_pci_softc *pc, int len)
217 {
218 struct rtwn_softc *sc = &pc->pc_sc;
219
220 if (sc->sc_ratectl != RTWN_RATECTL_NET80211) {
221 /* shouldn't happen */
222 device_printf(sc->sc_dev,
223 "%s called while ratectl = %d!\n",
224 __func__, sc->sc_ratectl);
225 return;
226 }
227
228 RTWN_NT_LOCK(sc);
229 rtwn_handle_tx_report(sc, pc->pc_rx_buf, len);
230 RTWN_NT_UNLOCK(sc);
231
232 #ifdef IEEE80211_SUPPORT_SUPERG
233 /*
234 * NB: this will executed only when 'report' bit is set.
235 */
236 if (sc->sc_tx_n_active > 0 && --sc->sc_tx_n_active <= 1)
237 rtwn_cmd_sleepable(sc, NULL, 0, rtwn_ff_flush_all);
238 #endif
239 }
240
241 static void
rtwn_pci_c2h_report(struct rtwn_pci_softc * pc,int len)242 rtwn_pci_c2h_report(struct rtwn_pci_softc *pc, int len)
243 {
244 rtwn_handle_c2h_report(&pc->pc_sc, pc->pc_rx_buf, len);
245 }
246
247 static void
rtwn_pci_tx_done(struct rtwn_softc * sc,int qid)248 rtwn_pci_tx_done(struct rtwn_softc *sc, int qid)
249 {
250 struct rtwn_pci_softc *pc = RTWN_PCI_SOFTC(sc);
251 struct rtwn_tx_ring *ring = &pc->tx_ring[qid];
252 struct rtwn_tx_desc_common *desc;
253 struct rtwn_tx_data *data;
254
255 RTWN_DPRINTF(sc, RTWN_DEBUG_INTR, "%s: qid %d, last %d, cur %d\n",
256 __func__, qid, ring->last, ring->cur);
257
258 bus_dmamap_sync(ring->desc_dmat, ring->desc_map,
259 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
260
261 while(ring->last != ring->cur) {
262 data = &ring->tx_data[ring->last];
263 desc = (struct rtwn_tx_desc_common *)
264 ((uint8_t *)ring->desc + sc->txdesc_len * ring->last);
265
266 KASSERT(data->m != NULL, ("no mbuf"));
267
268 if (desc->flags0 & RTWN_FLAGS0_OWN)
269 break;
270
271 /* Unmap and free mbuf. */
272 bus_dmamap_sync(ring->data_dmat, data->map,
273 BUS_DMASYNC_POSTWRITE);
274 bus_dmamap_unload(ring->data_dmat, data->map);
275
276 if (data->ni != NULL) { /* not a beacon frame */
277 ieee80211_tx_complete(data->ni, data->m, 0);
278
279 data->ni = NULL;
280 ring->queued--;
281 KASSERT(ring->queued >= 0,
282 ("ring->queued (qid %d) underflow!\n", qid));
283 } else
284 m_freem(data->m);
285
286 data->m = NULL;
287 ring->last = (ring->last + 1) % RTWN_PCI_TX_LIST_COUNT;
288 #ifndef D4054
289 if (ring->queued > 0)
290 sc->sc_tx_timer = 5;
291 else
292 sc->sc_tx_timer = 0;
293 #endif
294 }
295
296 if ((sc->qfullmsk & (1 << qid)) != 0 &&
297 ring->queued < (RTWN_PCI_TX_LIST_COUNT - 1)) {
298 sc->qfullmsk &= ~(1 << qid);
299 rtwn_start(sc);
300 }
301
302 #ifdef IEEE80211_SUPPORT_SUPERG
303 /*
304 * If the TX active queue drops below a certain
305 * threshold, ensure we age fast-frames out so they're
306 * transmitted.
307 */
308 if (sc->sc_ratectl != RTWN_RATECTL_NET80211 && ring->queued <= 1) {
309 /*
310 * XXX TODO: just make this a callout timer schedule
311 * so we can flush the FF staging queue if we're
312 * approaching idle.
313 */
314 rtwn_cmd_sleepable(sc, NULL, 0, rtwn_ff_flush_all);
315 }
316 #endif
317 }
318
319 static void
rtwn_pci_rx_done(struct rtwn_softc * sc)320 rtwn_pci_rx_done(struct rtwn_softc *sc)
321 {
322 struct rtwn_pci_softc *pc = RTWN_PCI_SOFTC(sc);
323 struct rtwn_rx_ring *ring = &pc->rx_ring;
324 struct rtwn_rx_stat_pci *rx_desc;
325 struct rtwn_rx_data *rx_data;
326 int len;
327
328 bus_dmamap_sync(ring->desc_dmat, ring->desc_map, BUS_DMASYNC_POSTREAD);
329
330 for (;;) {
331 rx_desc = &ring->desc[ring->cur];
332 rx_data = &ring->rx_data[ring->cur];
333
334 if (le32toh(rx_desc->rxdw0) & RTWN_RXDW0_OWN)
335 break;
336
337 len = rtwn_pci_rx_buf_copy(pc);
338
339 switch (rtwn_classify_intr(sc, pc->pc_rx_buf, len)) {
340 case RTWN_RX_DATA:
341 rtwn_pci_rx_frame(pc);
342 break;
343 case RTWN_RX_TX_REPORT:
344 rtwn_pci_tx_report(pc, len);
345 break;
346 case RTWN_RX_OTHER:
347 rtwn_pci_c2h_report(pc, len);
348 break;
349 default:
350 /* NOTREACHED */
351 KASSERT(0, ("unknown Rx classification code"));
352 break;
353 }
354
355 /* Update / reset RX descriptor (and set OWN bit). */
356 rtwn_pci_setup_rx_desc(pc, rx_desc, rx_data->paddr,
357 MJUMPAGESIZE, ring->cur);
358
359 if (!(sc->sc_flags & RTWN_RUNNING))
360 return;
361
362 /* NB: device can reuse current descriptor. */
363 bus_dmamap_sync(ring->desc_dmat, ring->desc_map,
364 BUS_DMASYNC_POSTREAD);
365
366 if (le32toh(rx_desc->rxdw0) & RTWN_RXDW0_OWN)
367 ring->cur = (ring->cur + 1) % RTWN_PCI_RX_LIST_COUNT;
368 }
369 }
370
371 void
rtwn_pci_intr(void * arg)372 rtwn_pci_intr(void *arg)
373 {
374 struct rtwn_softc *sc = arg;
375 struct rtwn_pci_softc *pc = RTWN_PCI_SOFTC(sc);
376 int i, status, tx_rings;
377
378 RTWN_LOCK(sc);
379 status = rtwn_pci_get_intr_status(pc, &tx_rings);
380 RTWN_DPRINTF(sc, RTWN_DEBUG_INTR, "%s: status %08X, tx_rings %08X\n",
381 __func__, status, tx_rings);
382 if (status == 0 && tx_rings == 0)
383 goto unlock;
384
385 if (status & (RTWN_PCI_INTR_RX | RTWN_PCI_INTR_TX_REPORT)) {
386 rtwn_pci_rx_done(sc);
387 if (!(sc->sc_flags & RTWN_RUNNING))
388 goto unlock;
389 }
390
391 if (tx_rings != 0)
392 for (i = 0; i < RTWN_PCI_NTXQUEUES; i++)
393 if (tx_rings & (1 << i))
394 rtwn_pci_tx_done(sc, i);
395
396 if (sc->sc_flags & RTWN_RUNNING)
397 rtwn_pci_enable_intr(pc);
398 unlock:
399 RTWN_UNLOCK(sc);
400 }
401