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Commit | Line | Data |
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f078f209 | 1 | /* |
cee075a2 | 2 | * Copyright (c) 2008-2009 Atheros Communications Inc. |
f078f209 LR |
3 | * |
4 | * Permission to use, copy, modify, and/or distribute this software for any | |
5 | * purpose with or without fee is hereby granted, provided that the above | |
6 | * copyright notice and this permission notice appear in all copies. | |
7 | * | |
8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
15 | */ | |
16 | ||
394cf0a1 | 17 | #include "ath9k.h" |
f078f209 | 18 | |
bce048d7 JM |
19 | static struct ieee80211_hw * ath_get_virt_hw(struct ath_softc *sc, |
20 | struct ieee80211_hdr *hdr) | |
21 | { | |
c52f33d0 JM |
22 | struct ieee80211_hw *hw = sc->pri_wiphy->hw; |
23 | int i; | |
24 | ||
25 | spin_lock_bh(&sc->wiphy_lock); | |
26 | for (i = 0; i < sc->num_sec_wiphy; i++) { | |
27 | struct ath_wiphy *aphy = sc->sec_wiphy[i]; | |
28 | if (aphy == NULL) | |
29 | continue; | |
30 | if (compare_ether_addr(hdr->addr1, aphy->hw->wiphy->perm_addr) | |
31 | == 0) { | |
32 | hw = aphy->hw; | |
33 | break; | |
34 | } | |
35 | } | |
36 | spin_unlock_bh(&sc->wiphy_lock); | |
37 | return hw; | |
bce048d7 JM |
38 | } |
39 | ||
f078f209 LR |
40 | /* |
41 | * Setup and link descriptors. | |
42 | * | |
43 | * 11N: we can no longer afford to self link the last descriptor. | |
44 | * MAC acknowledges BA status as long as it copies frames to host | |
45 | * buffer (or rx fifo). This can incorrectly acknowledge packets | |
46 | * to a sender if last desc is self-linked. | |
f078f209 | 47 | */ |
f078f209 LR |
48 | static void ath_rx_buf_link(struct ath_softc *sc, struct ath_buf *bf) |
49 | { | |
cbe61d8a | 50 | struct ath_hw *ah = sc->sc_ah; |
f078f209 LR |
51 | struct ath_desc *ds; |
52 | struct sk_buff *skb; | |
53 | ||
54 | ATH_RXBUF_RESET(bf); | |
55 | ||
56 | ds = bf->bf_desc; | |
be0418ad | 57 | ds->ds_link = 0; /* link to null */ |
f078f209 LR |
58 | ds->ds_data = bf->bf_buf_addr; |
59 | ||
be0418ad | 60 | /* virtual addr of the beginning of the buffer. */ |
f078f209 LR |
61 | skb = bf->bf_mpdu; |
62 | ASSERT(skb != NULL); | |
63 | ds->ds_vdata = skb->data; | |
64 | ||
b77f483f | 65 | /* setup rx descriptors. The rx.bufsize here tells the harware |
b4b6cda2 LR |
66 | * how much data it can DMA to us and that we are prepared |
67 | * to process */ | |
b77f483f S |
68 | ath9k_hw_setuprxdesc(ah, ds, |
69 | sc->rx.bufsize, | |
f078f209 LR |
70 | 0); |
71 | ||
b77f483f | 72 | if (sc->rx.rxlink == NULL) |
f078f209 LR |
73 | ath9k_hw_putrxbuf(ah, bf->bf_daddr); |
74 | else | |
b77f483f | 75 | *sc->rx.rxlink = bf->bf_daddr; |
f078f209 | 76 | |
b77f483f | 77 | sc->rx.rxlink = &ds->ds_link; |
f078f209 LR |
78 | ath9k_hw_rxena(ah); |
79 | } | |
80 | ||
ff37e337 S |
81 | static void ath_setdefantenna(struct ath_softc *sc, u32 antenna) |
82 | { | |
83 | /* XXX block beacon interrupts */ | |
84 | ath9k_hw_setantenna(sc->sc_ah, antenna); | |
b77f483f S |
85 | sc->rx.defant = antenna; |
86 | sc->rx.rxotherant = 0; | |
ff37e337 S |
87 | } |
88 | ||
89 | /* | |
90 | * Extend 15-bit time stamp from rx descriptor to | |
91 | * a full 64-bit TSF using the current h/w TSF. | |
92 | */ | |
93 | static u64 ath_extend_tsf(struct ath_softc *sc, u32 rstamp) | |
94 | { | |
95 | u64 tsf; | |
96 | ||
97 | tsf = ath9k_hw_gettsf64(sc->sc_ah); | |
98 | if ((tsf & 0x7fff) < rstamp) | |
99 | tsf -= 0x8000; | |
100 | return (tsf & ~0x7fff) | rstamp; | |
101 | } | |
102 | ||
f078f209 | 103 | /* |
be0418ad S |
104 | * For Decrypt or Demic errors, we only mark packet status here and always push |
105 | * up the frame up to let mac80211 handle the actual error case, be it no | |
106 | * decryption key or real decryption error. This let us keep statistics there. | |
f078f209 | 107 | */ |
be0418ad S |
108 | static int ath_rx_prepare(struct sk_buff *skb, struct ath_desc *ds, |
109 | struct ieee80211_rx_status *rx_status, bool *decrypt_error, | |
110 | struct ath_softc *sc) | |
f078f209 | 111 | { |
be0418ad | 112 | struct ieee80211_hdr *hdr; |
be0418ad S |
113 | u8 ratecode; |
114 | __le16 fc; | |
bce048d7 | 115 | struct ieee80211_hw *hw; |
a59b5a5e SB |
116 | struct ieee80211_sta *sta; |
117 | struct ath_node *an; | |
118 | int last_rssi = ATH_RSSI_DUMMY_MARKER; | |
119 | ||
be0418ad S |
120 | |
121 | hdr = (struct ieee80211_hdr *)skb->data; | |
122 | fc = hdr->frame_control; | |
123 | memset(rx_status, 0, sizeof(struct ieee80211_rx_status)); | |
bce048d7 | 124 | hw = ath_get_virt_hw(sc, hdr); |
be0418ad S |
125 | |
126 | if (ds->ds_rxstat.rs_more) { | |
127 | /* | |
128 | * Frame spans multiple descriptors; this cannot happen yet | |
129 | * as we don't support jumbograms. If not in monitor mode, | |
130 | * discard the frame. Enable this if you want to see | |
131 | * error frames in Monitor mode. | |
132 | */ | |
2660b81a | 133 | if (sc->sc_ah->opmode != NL80211_IFTYPE_MONITOR) |
be0418ad S |
134 | goto rx_next; |
135 | } else if (ds->ds_rxstat.rs_status != 0) { | |
136 | if (ds->ds_rxstat.rs_status & ATH9K_RXERR_CRC) | |
137 | rx_status->flag |= RX_FLAG_FAILED_FCS_CRC; | |
138 | if (ds->ds_rxstat.rs_status & ATH9K_RXERR_PHY) | |
139 | goto rx_next; | |
f078f209 | 140 | |
be0418ad S |
141 | if (ds->ds_rxstat.rs_status & ATH9K_RXERR_DECRYPT) { |
142 | *decrypt_error = true; | |
143 | } else if (ds->ds_rxstat.rs_status & ATH9K_RXERR_MIC) { | |
144 | if (ieee80211_is_ctl(fc)) | |
145 | /* | |
146 | * Sometimes, we get invalid | |
147 | * MIC failures on valid control frames. | |
148 | * Remove these mic errors. | |
149 | */ | |
150 | ds->ds_rxstat.rs_status &= ~ATH9K_RXERR_MIC; | |
151 | else | |
152 | rx_status->flag |= RX_FLAG_MMIC_ERROR; | |
153 | } | |
154 | /* | |
155 | * Reject error frames with the exception of | |
156 | * decryption and MIC failures. For monitor mode, | |
157 | * we also ignore the CRC error. | |
158 | */ | |
2660b81a | 159 | if (sc->sc_ah->opmode == NL80211_IFTYPE_MONITOR) { |
be0418ad S |
160 | if (ds->ds_rxstat.rs_status & |
161 | ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC | | |
162 | ATH9K_RXERR_CRC)) | |
163 | goto rx_next; | |
164 | } else { | |
165 | if (ds->ds_rxstat.rs_status & | |
166 | ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) { | |
167 | goto rx_next; | |
168 | } | |
169 | } | |
f078f209 LR |
170 | } |
171 | ||
be0418ad | 172 | ratecode = ds->ds_rxstat.rs_rate; |
be0418ad | 173 | |
be0418ad | 174 | if (ratecode & 0x80) { |
baad1d92 JM |
175 | /* HT rate */ |
176 | rx_status->flag |= RX_FLAG_HT; | |
be0418ad | 177 | if (ds->ds_rxstat.rs_flags & ATH9K_RX_2040) |
baad1d92 | 178 | rx_status->flag |= RX_FLAG_40MHZ; |
be0418ad | 179 | if (ds->ds_rxstat.rs_flags & ATH9K_RX_GI) |
baad1d92 JM |
180 | rx_status->flag |= RX_FLAG_SHORT_GI; |
181 | rx_status->rate_idx = ratecode & 0x7f; | |
182 | } else { | |
183 | int i = 0, cur_band, n_rates; | |
baad1d92 JM |
184 | |
185 | cur_band = hw->conf.channel->band; | |
186 | n_rates = sc->sbands[cur_band].n_bitrates; | |
187 | ||
188 | for (i = 0; i < n_rates; i++) { | |
189 | if (sc->sbands[cur_band].bitrates[i].hw_value == | |
190 | ratecode) { | |
191 | rx_status->rate_idx = i; | |
192 | break; | |
193 | } | |
194 | ||
195 | if (sc->sbands[cur_band].bitrates[i].hw_value_short == | |
196 | ratecode) { | |
197 | rx_status->rate_idx = i; | |
198 | rx_status->flag |= RX_FLAG_SHORTPRE; | |
199 | break; | |
200 | } | |
201 | } | |
be0418ad S |
202 | } |
203 | ||
a59b5a5e SB |
204 | rcu_read_lock(); |
205 | sta = ieee80211_find_sta(sc->hw, hdr->addr2); | |
206 | if (sta) { | |
207 | an = (struct ath_node *) sta->drv_priv; | |
208 | if (ds->ds_rxstat.rs_rssi != ATH9K_RSSI_BAD && | |
209 | !ds->ds_rxstat.rs_moreaggr) | |
210 | ATH_RSSI_LPF(an->last_rssi, ds->ds_rxstat.rs_rssi); | |
211 | last_rssi = an->last_rssi; | |
212 | } | |
213 | rcu_read_unlock(); | |
214 | ||
215 | if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER)) | |
216 | ds->ds_rxstat.rs_rssi = ATH_EP_RND(last_rssi, | |
217 | ATH_RSSI_EP_MULTIPLIER); | |
218 | if (ds->ds_rxstat.rs_rssi < 0) | |
219 | ds->ds_rxstat.rs_rssi = 0; | |
220 | else if (ds->ds_rxstat.rs_rssi > 127) | |
221 | ds->ds_rxstat.rs_rssi = 127; | |
222 | ||
5e32b1ed S |
223 | /* Update Beacon RSSI, this is used by ANI. */ |
224 | if (ieee80211_is_beacon(fc)) | |
22e66a4c | 225 | sc->sc_ah->stats.avgbrssi = ds->ds_rxstat.rs_rssi; |
5e32b1ed | 226 | |
be0418ad | 227 | rx_status->mactime = ath_extend_tsf(sc, ds->ds_rxstat.rs_tstamp); |
bce048d7 JM |
228 | rx_status->band = hw->conf.channel->band; |
229 | rx_status->freq = hw->conf.channel->center_freq; | |
17d7904d | 230 | rx_status->noise = sc->ani.noise_floor; |
a59b5a5e | 231 | rx_status->signal = ATH_DEFAULT_NOISE_FLOOR + ds->ds_rxstat.rs_rssi; |
be0418ad S |
232 | rx_status->antenna = ds->ds_rxstat.rs_antenna; |
233 | ||
7d5ca3b8 LR |
234 | /* |
235 | * Theory for reporting quality: | |
236 | * | |
237 | * At a hardware RSSI of 45 you will be able to use MCS 7 reliably. | |
238 | * At a hardware RSSI of 45 you will be able to use MCS 15 reliably. | |
239 | * At a hardware RSSI of 35 you should be able use 54 Mbps reliably. | |
240 | * | |
241 | * MCS 7 is the highets MCS index usable by a 1-stream device. | |
242 | * MCS 15 is the highest MCS index usable by a 2-stream device. | |
243 | * | |
244 | * All ath9k devices are either 1-stream or 2-stream. | |
245 | * | |
246 | * How many bars you see is derived from the qual reporting. | |
247 | * | |
248 | * A more elaborate scheme can be used here but it requires tables | |
249 | * of SNR/throughput for each possible mode used. For the MCS table | |
250 | * you can refer to the wireless wiki: | |
251 | * | |
252 | * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n | |
253 | * | |
254 | */ | |
255 | if (conf_is_ht(&hw->conf)) | |
256 | rx_status->qual = ds->ds_rxstat.rs_rssi * 100 / 45; | |
257 | else | |
258 | rx_status->qual = ds->ds_rxstat.rs_rssi * 100 / 35; | |
be0418ad S |
259 | |
260 | /* rssi can be more than 45 though, anything above that | |
261 | * should be considered at 100% */ | |
262 | if (rx_status->qual > 100) | |
263 | rx_status->qual = 100; | |
264 | ||
265 | rx_status->flag |= RX_FLAG_TSFT; | |
266 | ||
267 | return 1; | |
268 | rx_next: | |
269 | return 0; | |
f078f209 LR |
270 | } |
271 | ||
272 | static void ath_opmode_init(struct ath_softc *sc) | |
273 | { | |
cbe61d8a | 274 | struct ath_hw *ah = sc->sc_ah; |
f078f209 LR |
275 | u32 rfilt, mfilt[2]; |
276 | ||
277 | /* configure rx filter */ | |
278 | rfilt = ath_calcrxfilter(sc); | |
279 | ath9k_hw_setrxfilter(ah, rfilt); | |
280 | ||
281 | /* configure bssid mask */ | |
2660b81a | 282 | if (ah->caps.hw_caps & ATH9K_HW_CAP_BSSIDMASK) |
f2b2143e | 283 | ath9k_hw_setbssidmask(ah); |
f078f209 LR |
284 | |
285 | /* configure operational mode */ | |
286 | ath9k_hw_setopmode(ah); | |
287 | ||
288 | /* Handle any link-level address change. */ | |
ba52da58 | 289 | ath9k_hw_setmac(ah, sc->sc_ah->macaddr); |
f078f209 LR |
290 | |
291 | /* calculate and install multicast filter */ | |
292 | mfilt[0] = mfilt[1] = ~0; | |
f078f209 | 293 | ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]); |
f078f209 LR |
294 | } |
295 | ||
296 | int ath_rx_init(struct ath_softc *sc, int nbufs) | |
297 | { | |
298 | struct sk_buff *skb; | |
299 | struct ath_buf *bf; | |
300 | int error = 0; | |
301 | ||
797fe5cb S |
302 | spin_lock_init(&sc->rx.rxflushlock); |
303 | sc->sc_flags &= ~SC_OP_RXFLUSH; | |
304 | spin_lock_init(&sc->rx.rxbuflock); | |
f078f209 | 305 | |
797fe5cb | 306 | sc->rx.bufsize = roundup(IEEE80211_MAX_MPDU_LEN, |
d15dd3e5 | 307 | min(sc->common.cachelsz, (u16)64)); |
f078f209 | 308 | |
4d6b228d | 309 | DPRINTF(sc->sc_ah, ATH_DBG_CONFIG, "cachelsz %u rxbufsize %u\n", |
d15dd3e5 | 310 | sc->common.cachelsz, sc->rx.bufsize); |
f078f209 | 311 | |
797fe5cb | 312 | /* Initialize rx descriptors */ |
f078f209 | 313 | |
797fe5cb S |
314 | error = ath_descdma_setup(sc, &sc->rx.rxdma, &sc->rx.rxbuf, |
315 | "rx", nbufs, 1); | |
316 | if (error != 0) { | |
4d6b228d | 317 | DPRINTF(sc->sc_ah, ATH_DBG_FATAL, |
797fe5cb S |
318 | "failed to allocate rx descriptors: %d\n", error); |
319 | goto err; | |
320 | } | |
f078f209 | 321 | |
797fe5cb | 322 | list_for_each_entry(bf, &sc->rx.rxbuf, list) { |
d15dd3e5 | 323 | skb = ath_rxbuf_alloc(&sc->common, sc->rx.bufsize, GFP_KERNEL); |
797fe5cb S |
324 | if (skb == NULL) { |
325 | error = -ENOMEM; | |
326 | goto err; | |
f078f209 | 327 | } |
f078f209 | 328 | |
797fe5cb S |
329 | bf->bf_mpdu = skb; |
330 | bf->bf_buf_addr = dma_map_single(sc->dev, skb->data, | |
331 | sc->rx.bufsize, | |
332 | DMA_FROM_DEVICE); | |
333 | if (unlikely(dma_mapping_error(sc->dev, | |
334 | bf->bf_buf_addr))) { | |
335 | dev_kfree_skb_any(skb); | |
336 | bf->bf_mpdu = NULL; | |
4d6b228d | 337 | DPRINTF(sc->sc_ah, ATH_DBG_FATAL, |
797fe5cb S |
338 | "dma_mapping_error() on RX init\n"); |
339 | error = -ENOMEM; | |
340 | goto err; | |
341 | } | |
342 | bf->bf_dmacontext = bf->bf_buf_addr; | |
343 | } | |
344 | sc->rx.rxlink = NULL; | |
f078f209 | 345 | |
797fe5cb | 346 | err: |
f078f209 LR |
347 | if (error) |
348 | ath_rx_cleanup(sc); | |
349 | ||
350 | return error; | |
351 | } | |
352 | ||
f078f209 LR |
353 | void ath_rx_cleanup(struct ath_softc *sc) |
354 | { | |
355 | struct sk_buff *skb; | |
356 | struct ath_buf *bf; | |
357 | ||
b77f483f | 358 | list_for_each_entry(bf, &sc->rx.rxbuf, list) { |
f078f209 | 359 | skb = bf->bf_mpdu; |
051b9191 | 360 | if (skb) { |
797fe5cb S |
361 | dma_unmap_single(sc->dev, bf->bf_buf_addr, |
362 | sc->rx.bufsize, DMA_FROM_DEVICE); | |
f078f209 | 363 | dev_kfree_skb(skb); |
051b9191 | 364 | } |
f078f209 LR |
365 | } |
366 | ||
b77f483f S |
367 | if (sc->rx.rxdma.dd_desc_len != 0) |
368 | ath_descdma_cleanup(sc, &sc->rx.rxdma, &sc->rx.rxbuf); | |
f078f209 LR |
369 | } |
370 | ||
371 | /* | |
372 | * Calculate the receive filter according to the | |
373 | * operating mode and state: | |
374 | * | |
375 | * o always accept unicast, broadcast, and multicast traffic | |
376 | * o maintain current state of phy error reception (the hal | |
377 | * may enable phy error frames for noise immunity work) | |
378 | * o probe request frames are accepted only when operating in | |
379 | * hostap, adhoc, or monitor modes | |
380 | * o enable promiscuous mode according to the interface state | |
381 | * o accept beacons: | |
382 | * - when operating in adhoc mode so the 802.11 layer creates | |
383 | * node table entries for peers, | |
384 | * - when operating in station mode for collecting rssi data when | |
385 | * the station is otherwise quiet, or | |
386 | * - when operating as a repeater so we see repeater-sta beacons | |
387 | * - when scanning | |
388 | */ | |
389 | ||
390 | u32 ath_calcrxfilter(struct ath_softc *sc) | |
391 | { | |
392 | #define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR) | |
7dcfdcd9 | 393 | |
f078f209 LR |
394 | u32 rfilt; |
395 | ||
396 | rfilt = (ath9k_hw_getrxfilter(sc->sc_ah) & RX_FILTER_PRESERVE) | |
397 | | ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST | |
398 | | ATH9K_RX_FILTER_MCAST; | |
399 | ||
400 | /* If not a STA, enable processing of Probe Requests */ | |
2660b81a | 401 | if (sc->sc_ah->opmode != NL80211_IFTYPE_STATION) |
f078f209 LR |
402 | rfilt |= ATH9K_RX_FILTER_PROBEREQ; |
403 | ||
217ba9da JM |
404 | /* |
405 | * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station | |
406 | * mode interface or when in monitor mode. AP mode does not need this | |
407 | * since it receives all in-BSS frames anyway. | |
408 | */ | |
2660b81a | 409 | if (((sc->sc_ah->opmode != NL80211_IFTYPE_AP) && |
b77f483f | 410 | (sc->rx.rxfilter & FIF_PROMISC_IN_BSS)) || |
217ba9da | 411 | (sc->sc_ah->opmode == NL80211_IFTYPE_MONITOR)) |
f078f209 | 412 | rfilt |= ATH9K_RX_FILTER_PROM; |
f078f209 | 413 | |
d42c6b71 S |
414 | if (sc->rx.rxfilter & FIF_CONTROL) |
415 | rfilt |= ATH9K_RX_FILTER_CONTROL; | |
416 | ||
dbaaa147 VT |
417 | if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) && |
418 | !(sc->rx.rxfilter & FIF_BCN_PRBRESP_PROMISC)) | |
419 | rfilt |= ATH9K_RX_FILTER_MYBEACON; | |
420 | else | |
f078f209 LR |
421 | rfilt |= ATH9K_RX_FILTER_BEACON; |
422 | ||
63b08b8d | 423 | if (sc->rx.rxfilter & FIF_PSPOLL) |
dbaaa147 | 424 | rfilt |= ATH9K_RX_FILTER_PSPOLL; |
be0418ad | 425 | |
7ea310be S |
426 | if (conf_is_ht(&sc->hw->conf)) |
427 | rfilt |= ATH9K_RX_FILTER_COMP_BAR; | |
428 | ||
5eb6ba83 | 429 | if (sc->sec_wiphy || (sc->rx.rxfilter & FIF_OTHER_BSS)) { |
b93bce2a JM |
430 | /* TODO: only needed if more than one BSSID is in use in |
431 | * station/adhoc mode */ | |
5eb6ba83 JC |
432 | /* The following may also be needed for other older chips */ |
433 | if (sc->sc_ah->hw_version.macVersion == AR_SREV_VERSION_9160) | |
434 | rfilt |= ATH9K_RX_FILTER_PROM; | |
b93bce2a JM |
435 | rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL; |
436 | } | |
437 | ||
f078f209 | 438 | return rfilt; |
7dcfdcd9 | 439 | |
f078f209 LR |
440 | #undef RX_FILTER_PRESERVE |
441 | } | |
442 | ||
f078f209 LR |
443 | int ath_startrecv(struct ath_softc *sc) |
444 | { | |
cbe61d8a | 445 | struct ath_hw *ah = sc->sc_ah; |
f078f209 LR |
446 | struct ath_buf *bf, *tbf; |
447 | ||
b77f483f S |
448 | spin_lock_bh(&sc->rx.rxbuflock); |
449 | if (list_empty(&sc->rx.rxbuf)) | |
f078f209 LR |
450 | goto start_recv; |
451 | ||
b77f483f S |
452 | sc->rx.rxlink = NULL; |
453 | list_for_each_entry_safe(bf, tbf, &sc->rx.rxbuf, list) { | |
f078f209 LR |
454 | ath_rx_buf_link(sc, bf); |
455 | } | |
456 | ||
457 | /* We could have deleted elements so the list may be empty now */ | |
b77f483f | 458 | if (list_empty(&sc->rx.rxbuf)) |
f078f209 LR |
459 | goto start_recv; |
460 | ||
b77f483f | 461 | bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list); |
f078f209 | 462 | ath9k_hw_putrxbuf(ah, bf->bf_daddr); |
be0418ad | 463 | ath9k_hw_rxena(ah); |
f078f209 LR |
464 | |
465 | start_recv: | |
b77f483f | 466 | spin_unlock_bh(&sc->rx.rxbuflock); |
be0418ad S |
467 | ath_opmode_init(sc); |
468 | ath9k_hw_startpcureceive(ah); | |
469 | ||
f078f209 LR |
470 | return 0; |
471 | } | |
472 | ||
f078f209 LR |
473 | bool ath_stoprecv(struct ath_softc *sc) |
474 | { | |
cbe61d8a | 475 | struct ath_hw *ah = sc->sc_ah; |
f078f209 LR |
476 | bool stopped; |
477 | ||
be0418ad S |
478 | ath9k_hw_stoppcurecv(ah); |
479 | ath9k_hw_setrxfilter(ah, 0); | |
480 | stopped = ath9k_hw_stopdmarecv(ah); | |
b77f483f | 481 | sc->rx.rxlink = NULL; |
be0418ad | 482 | |
f078f209 LR |
483 | return stopped; |
484 | } | |
485 | ||
f078f209 LR |
486 | void ath_flushrecv(struct ath_softc *sc) |
487 | { | |
b77f483f | 488 | spin_lock_bh(&sc->rx.rxflushlock); |
98deeea0 | 489 | sc->sc_flags |= SC_OP_RXFLUSH; |
f078f209 | 490 | ath_rx_tasklet(sc, 1); |
98deeea0 | 491 | sc->sc_flags &= ~SC_OP_RXFLUSH; |
b77f483f | 492 | spin_unlock_bh(&sc->rx.rxflushlock); |
f078f209 LR |
493 | } |
494 | ||
cc65965c JM |
495 | static bool ath_beacon_dtim_pending_cab(struct sk_buff *skb) |
496 | { | |
497 | /* Check whether the Beacon frame has DTIM indicating buffered bc/mc */ | |
498 | struct ieee80211_mgmt *mgmt; | |
499 | u8 *pos, *end, id, elen; | |
500 | struct ieee80211_tim_ie *tim; | |
501 | ||
502 | mgmt = (struct ieee80211_mgmt *)skb->data; | |
503 | pos = mgmt->u.beacon.variable; | |
504 | end = skb->data + skb->len; | |
505 | ||
506 | while (pos + 2 < end) { | |
507 | id = *pos++; | |
508 | elen = *pos++; | |
509 | if (pos + elen > end) | |
510 | break; | |
511 | ||
512 | if (id == WLAN_EID_TIM) { | |
513 | if (elen < sizeof(*tim)) | |
514 | break; | |
515 | tim = (struct ieee80211_tim_ie *) pos; | |
516 | if (tim->dtim_count != 0) | |
517 | break; | |
518 | return tim->bitmap_ctrl & 0x01; | |
519 | } | |
520 | ||
521 | pos += elen; | |
522 | } | |
523 | ||
524 | return false; | |
525 | } | |
526 | ||
cc65965c JM |
527 | static void ath_rx_ps_beacon(struct ath_softc *sc, struct sk_buff *skb) |
528 | { | |
529 | struct ieee80211_mgmt *mgmt; | |
530 | ||
531 | if (skb->len < 24 + 8 + 2 + 2) | |
532 | return; | |
533 | ||
534 | mgmt = (struct ieee80211_mgmt *)skb->data; | |
535 | if (memcmp(sc->curbssid, mgmt->bssid, ETH_ALEN) != 0) | |
536 | return; /* not from our current AP */ | |
537 | ||
293dc5df GJ |
538 | sc->sc_flags &= ~SC_OP_WAIT_FOR_BEACON; |
539 | ||
ccdfeab6 JM |
540 | if (sc->sc_flags & SC_OP_BEACON_SYNC) { |
541 | sc->sc_flags &= ~SC_OP_BEACON_SYNC; | |
4d6b228d | 542 | DPRINTF(sc->sc_ah, ATH_DBG_PS, "Reconfigure Beacon timers based on " |
ccdfeab6 JM |
543 | "timestamp from the AP\n"); |
544 | ath_beacon_config(sc, NULL); | |
545 | } | |
546 | ||
cc65965c JM |
547 | if (ath_beacon_dtim_pending_cab(skb)) { |
548 | /* | |
549 | * Remain awake waiting for buffered broadcast/multicast | |
58f5fffd GJ |
550 | * frames. If the last broadcast/multicast frame is not |
551 | * received properly, the next beacon frame will work as | |
552 | * a backup trigger for returning into NETWORK SLEEP state, | |
553 | * so we are waiting for it as well. | |
cc65965c | 554 | */ |
4d6b228d | 555 | DPRINTF(sc->sc_ah, ATH_DBG_PS, "Received DTIM beacon indicating " |
cc65965c | 556 | "buffered broadcast/multicast frame(s)\n"); |
58f5fffd | 557 | sc->sc_flags |= SC_OP_WAIT_FOR_CAB | SC_OP_WAIT_FOR_BEACON; |
cc65965c JM |
558 | return; |
559 | } | |
560 | ||
561 | if (sc->sc_flags & SC_OP_WAIT_FOR_CAB) { | |
562 | /* | |
563 | * This can happen if a broadcast frame is dropped or the AP | |
564 | * fails to send a frame indicating that all CAB frames have | |
565 | * been delivered. | |
566 | */ | |
293dc5df | 567 | sc->sc_flags &= ~SC_OP_WAIT_FOR_CAB; |
4d6b228d | 568 | DPRINTF(sc->sc_ah, ATH_DBG_PS, "PS wait for CAB frames timed out\n"); |
cc65965c | 569 | } |
cc65965c JM |
570 | } |
571 | ||
572 | static void ath_rx_ps(struct ath_softc *sc, struct sk_buff *skb) | |
573 | { | |
574 | struct ieee80211_hdr *hdr; | |
575 | ||
576 | hdr = (struct ieee80211_hdr *)skb->data; | |
577 | ||
578 | /* Process Beacon and CAB receive in PS state */ | |
9a23f9ca JM |
579 | if ((sc->sc_flags & SC_OP_WAIT_FOR_BEACON) && |
580 | ieee80211_is_beacon(hdr->frame_control)) | |
cc65965c JM |
581 | ath_rx_ps_beacon(sc, skb); |
582 | else if ((sc->sc_flags & SC_OP_WAIT_FOR_CAB) && | |
583 | (ieee80211_is_data(hdr->frame_control) || | |
584 | ieee80211_is_action(hdr->frame_control)) && | |
585 | is_multicast_ether_addr(hdr->addr1) && | |
586 | !ieee80211_has_moredata(hdr->frame_control)) { | |
cc65965c JM |
587 | /* |
588 | * No more broadcast/multicast frames to be received at this | |
589 | * point. | |
590 | */ | |
293dc5df | 591 | sc->sc_flags &= ~SC_OP_WAIT_FOR_CAB; |
4d6b228d | 592 | DPRINTF(sc->sc_ah, ATH_DBG_PS, "All PS CAB frames received, back to " |
293dc5df | 593 | "sleep\n"); |
9a23f9ca JM |
594 | } else if ((sc->sc_flags & SC_OP_WAIT_FOR_PSPOLL_DATA) && |
595 | !is_multicast_ether_addr(hdr->addr1) && | |
596 | !ieee80211_has_morefrags(hdr->frame_control)) { | |
597 | sc->sc_flags &= ~SC_OP_WAIT_FOR_PSPOLL_DATA; | |
4d6b228d | 598 | DPRINTF(sc->sc_ah, ATH_DBG_PS, "Going back to sleep after having " |
9a23f9ca JM |
599 | "received PS-Poll data (0x%x)\n", |
600 | sc->sc_flags & (SC_OP_WAIT_FOR_BEACON | | |
601 | SC_OP_WAIT_FOR_CAB | | |
602 | SC_OP_WAIT_FOR_PSPOLL_DATA | | |
603 | SC_OP_WAIT_FOR_TX_ACK)); | |
cc65965c JM |
604 | } |
605 | } | |
606 | ||
9d64a3cf JM |
607 | static void ath_rx_send_to_mac80211(struct ath_softc *sc, struct sk_buff *skb, |
608 | struct ieee80211_rx_status *rx_status) | |
609 | { | |
610 | struct ieee80211_hdr *hdr; | |
611 | ||
612 | hdr = (struct ieee80211_hdr *)skb->data; | |
613 | ||
614 | /* Send the frame to mac80211 */ | |
615 | if (is_multicast_ether_addr(hdr->addr1)) { | |
616 | int i; | |
617 | /* | |
618 | * Deliver broadcast/multicast frames to all suitable | |
619 | * virtual wiphys. | |
620 | */ | |
621 | /* TODO: filter based on channel configuration */ | |
622 | for (i = 0; i < sc->num_sec_wiphy; i++) { | |
623 | struct ath_wiphy *aphy = sc->sec_wiphy[i]; | |
624 | struct sk_buff *nskb; | |
625 | if (aphy == NULL) | |
626 | continue; | |
627 | nskb = skb_copy(skb, GFP_ATOMIC); | |
f1d58c25 JB |
628 | if (nskb) { |
629 | memcpy(IEEE80211_SKB_RXCB(nskb), rx_status, | |
630 | sizeof(*rx_status)); | |
631 | ieee80211_rx(aphy->hw, nskb); | |
632 | } | |
9d64a3cf | 633 | } |
f1d58c25 JB |
634 | memcpy(IEEE80211_SKB_RXCB(skb), rx_status, sizeof(*rx_status)); |
635 | ieee80211_rx(sc->hw, skb); | |
9d64a3cf JM |
636 | } else { |
637 | /* Deliver unicast frames based on receiver address */ | |
f1d58c25 JB |
638 | memcpy(IEEE80211_SKB_RXCB(skb), rx_status, sizeof(*rx_status)); |
639 | ieee80211_rx(ath_get_virt_hw(sc, hdr), skb); | |
9d64a3cf JM |
640 | } |
641 | } | |
642 | ||
f078f209 LR |
643 | int ath_rx_tasklet(struct ath_softc *sc, int flush) |
644 | { | |
645 | #define PA2DESC(_sc, _pa) \ | |
b77f483f S |
646 | ((struct ath_desc *)((caddr_t)(_sc)->rx.rxdma.dd_desc + \ |
647 | ((_pa) - (_sc)->rx.rxdma.dd_desc_paddr))) | |
f078f209 | 648 | |
be0418ad | 649 | struct ath_buf *bf; |
f078f209 | 650 | struct ath_desc *ds; |
cb71d9ba | 651 | struct sk_buff *skb = NULL, *requeue_skb; |
be0418ad | 652 | struct ieee80211_rx_status rx_status; |
cbe61d8a | 653 | struct ath_hw *ah = sc->sc_ah; |
be0418ad S |
654 | struct ieee80211_hdr *hdr; |
655 | int hdrlen, padsize, retval; | |
656 | bool decrypt_error = false; | |
657 | u8 keyix; | |
853da11b | 658 | __le16 fc; |
be0418ad | 659 | |
b77f483f | 660 | spin_lock_bh(&sc->rx.rxbuflock); |
f078f209 LR |
661 | |
662 | do { | |
663 | /* If handling rx interrupt and flush is in progress => exit */ | |
98deeea0 | 664 | if ((sc->sc_flags & SC_OP_RXFLUSH) && (flush == 0)) |
f078f209 LR |
665 | break; |
666 | ||
b77f483f S |
667 | if (list_empty(&sc->rx.rxbuf)) { |
668 | sc->rx.rxlink = NULL; | |
f078f209 LR |
669 | break; |
670 | } | |
671 | ||
b77f483f | 672 | bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list); |
f078f209 | 673 | ds = bf->bf_desc; |
f078f209 LR |
674 | |
675 | /* | |
676 | * Must provide the virtual address of the current | |
677 | * descriptor, the physical address, and the virtual | |
678 | * address of the next descriptor in the h/w chain. | |
679 | * This allows the HAL to look ahead to see if the | |
680 | * hardware is done with a descriptor by checking the | |
681 | * done bit in the following descriptor and the address | |
682 | * of the current descriptor the DMA engine is working | |
683 | * on. All this is necessary because of our use of | |
684 | * a self-linked list to avoid rx overruns. | |
685 | */ | |
be0418ad | 686 | retval = ath9k_hw_rxprocdesc(ah, ds, |
f078f209 LR |
687 | bf->bf_daddr, |
688 | PA2DESC(sc, ds->ds_link), | |
689 | 0); | |
690 | if (retval == -EINPROGRESS) { | |
691 | struct ath_buf *tbf; | |
692 | struct ath_desc *tds; | |
693 | ||
b77f483f S |
694 | if (list_is_last(&bf->list, &sc->rx.rxbuf)) { |
695 | sc->rx.rxlink = NULL; | |
f078f209 LR |
696 | break; |
697 | } | |
698 | ||
699 | tbf = list_entry(bf->list.next, struct ath_buf, list); | |
700 | ||
701 | /* | |
702 | * On some hardware the descriptor status words could | |
703 | * get corrupted, including the done bit. Because of | |
704 | * this, check if the next descriptor's done bit is | |
705 | * set or not. | |
706 | * | |
707 | * If the next descriptor's done bit is set, the current | |
708 | * descriptor has been corrupted. Force s/w to discard | |
709 | * this descriptor and continue... | |
710 | */ | |
711 | ||
712 | tds = tbf->bf_desc; | |
be0418ad S |
713 | retval = ath9k_hw_rxprocdesc(ah, tds, tbf->bf_daddr, |
714 | PA2DESC(sc, tds->ds_link), 0); | |
f078f209 | 715 | if (retval == -EINPROGRESS) { |
f078f209 LR |
716 | break; |
717 | } | |
718 | } | |
719 | ||
f078f209 | 720 | skb = bf->bf_mpdu; |
be0418ad | 721 | if (!skb) |
f078f209 | 722 | continue; |
f078f209 | 723 | |
9bf9fca8 VT |
724 | /* |
725 | * Synchronize the DMA transfer with CPU before | |
726 | * 1. accessing the frame | |
727 | * 2. requeueing the same buffer to h/w | |
728 | */ | |
7da3c55c | 729 | dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr, |
9bf9fca8 | 730 | sc->rx.bufsize, |
7da3c55c | 731 | DMA_FROM_DEVICE); |
9bf9fca8 | 732 | |
f078f209 | 733 | /* |
be0418ad S |
734 | * If we're asked to flush receive queue, directly |
735 | * chain it back at the queue without processing it. | |
f078f209 | 736 | */ |
be0418ad | 737 | if (flush) |
cb71d9ba | 738 | goto requeue; |
f078f209 | 739 | |
be0418ad | 740 | if (!ds->ds_rxstat.rs_datalen) |
cb71d9ba | 741 | goto requeue; |
f078f209 | 742 | |
be0418ad | 743 | /* The status portion of the descriptor could get corrupted. */ |
b77f483f | 744 | if (sc->rx.bufsize < ds->ds_rxstat.rs_datalen) |
cb71d9ba | 745 | goto requeue; |
f078f209 | 746 | |
be0418ad | 747 | if (!ath_rx_prepare(skb, ds, &rx_status, &decrypt_error, sc)) |
cb71d9ba LR |
748 | goto requeue; |
749 | ||
750 | /* Ensure we always have an skb to requeue once we are done | |
751 | * processing the current buffer's skb */ | |
d15dd3e5 | 752 | requeue_skb = ath_rxbuf_alloc(&sc->common, sc->rx.bufsize, GFP_ATOMIC); |
cb71d9ba LR |
753 | |
754 | /* If there is no memory we ignore the current RX'd frame, | |
755 | * tell hardware it can give us a new frame using the old | |
b77f483f | 756 | * skb and put it at the tail of the sc->rx.rxbuf list for |
cb71d9ba LR |
757 | * processing. */ |
758 | if (!requeue_skb) | |
759 | goto requeue; | |
f078f209 | 760 | |
9bf9fca8 | 761 | /* Unmap the frame */ |
7da3c55c | 762 | dma_unmap_single(sc->dev, bf->bf_buf_addr, |
b77f483f | 763 | sc->rx.bufsize, |
7da3c55c | 764 | DMA_FROM_DEVICE); |
f078f209 | 765 | |
be0418ad | 766 | skb_put(skb, ds->ds_rxstat.rs_datalen); |
be0418ad S |
767 | |
768 | /* see if any padding is done by the hw and remove it */ | |
769 | hdr = (struct ieee80211_hdr *)skb->data; | |
770 | hdrlen = ieee80211_get_hdrlen_from_skb(skb); | |
853da11b | 771 | fc = hdr->frame_control; |
be0418ad | 772 | |
9c5f89b3 JM |
773 | /* The MAC header is padded to have 32-bit boundary if the |
774 | * packet payload is non-zero. The general calculation for | |
775 | * padsize would take into account odd header lengths: | |
776 | * padsize = (4 - hdrlen % 4) % 4; However, since only | |
777 | * even-length headers are used, padding can only be 0 or 2 | |
778 | * bytes and we can optimize this a bit. In addition, we must | |
779 | * not try to remove padding from short control frames that do | |
780 | * not have payload. */ | |
781 | padsize = hdrlen & 3; | |
782 | if (padsize && hdrlen >= 24) { | |
be0418ad S |
783 | memmove(skb->data + padsize, skb->data, hdrlen); |
784 | skb_pull(skb, padsize); | |
f078f209 LR |
785 | } |
786 | ||
be0418ad | 787 | keyix = ds->ds_rxstat.rs_keyix; |
f078f209 | 788 | |
be0418ad S |
789 | if (!(keyix == ATH9K_RXKEYIX_INVALID) && !decrypt_error) { |
790 | rx_status.flag |= RX_FLAG_DECRYPTED; | |
9d64a3cf | 791 | } else if (ieee80211_has_protected(fc) |
be0418ad S |
792 | && !decrypt_error && skb->len >= hdrlen + 4) { |
793 | keyix = skb->data[hdrlen + 3] >> 6; | |
794 | ||
17d7904d | 795 | if (test_bit(keyix, sc->keymap)) |
be0418ad S |
796 | rx_status.flag |= RX_FLAG_DECRYPTED; |
797 | } | |
0ced0e17 JM |
798 | if (ah->sw_mgmt_crypto && |
799 | (rx_status.flag & RX_FLAG_DECRYPTED) && | |
9d64a3cf | 800 | ieee80211_is_mgmt(fc)) { |
0ced0e17 JM |
801 | /* Use software decrypt for management frames. */ |
802 | rx_status.flag &= ~RX_FLAG_DECRYPTED; | |
803 | } | |
be0418ad | 804 | |
cb71d9ba LR |
805 | /* We will now give hardware our shiny new allocated skb */ |
806 | bf->bf_mpdu = requeue_skb; | |
7da3c55c | 807 | bf->bf_buf_addr = dma_map_single(sc->dev, requeue_skb->data, |
b77f483f | 808 | sc->rx.bufsize, |
7da3c55c GJ |
809 | DMA_FROM_DEVICE); |
810 | if (unlikely(dma_mapping_error(sc->dev, | |
f8316df1 LR |
811 | bf->bf_buf_addr))) { |
812 | dev_kfree_skb_any(requeue_skb); | |
813 | bf->bf_mpdu = NULL; | |
4d6b228d | 814 | DPRINTF(sc->sc_ah, ATH_DBG_FATAL, |
7da3c55c | 815 | "dma_mapping_error() on RX\n"); |
cc65965c | 816 | ath_rx_send_to_mac80211(sc, skb, &rx_status); |
f8316df1 LR |
817 | break; |
818 | } | |
cb71d9ba | 819 | bf->bf_dmacontext = bf->bf_buf_addr; |
f078f209 LR |
820 | |
821 | /* | |
822 | * change the default rx antenna if rx diversity chooses the | |
823 | * other antenna 3 times in a row. | |
824 | */ | |
b77f483f S |
825 | if (sc->rx.defant != ds->ds_rxstat.rs_antenna) { |
826 | if (++sc->rx.rxotherant >= 3) | |
be0418ad | 827 | ath_setdefantenna(sc, ds->ds_rxstat.rs_antenna); |
f078f209 | 828 | } else { |
b77f483f | 829 | sc->rx.rxotherant = 0; |
f078f209 | 830 | } |
3cbb5dd7 | 831 | |
9a23f9ca | 832 | if (unlikely(sc->sc_flags & (SC_OP_WAIT_FOR_BEACON | |
f0e9a860 | 833 | SC_OP_WAIT_FOR_CAB | |
9a23f9ca | 834 | SC_OP_WAIT_FOR_PSPOLL_DATA))) |
cc65965c JM |
835 | ath_rx_ps(sc, skb); |
836 | ||
837 | ath_rx_send_to_mac80211(sc, skb, &rx_status); | |
838 | ||
cb71d9ba | 839 | requeue: |
b77f483f | 840 | list_move_tail(&bf->list, &sc->rx.rxbuf); |
cb71d9ba | 841 | ath_rx_buf_link(sc, bf); |
be0418ad S |
842 | } while (1); |
843 | ||
b77f483f | 844 | spin_unlock_bh(&sc->rx.rxbuflock); |
f078f209 LR |
845 | |
846 | return 0; | |
847 | #undef PA2DESC | |
848 | } |