3 Broadcom B43 wireless driver
5 Transmission (TX/RX) related functions.
7 Copyright (C) 2005 Martin Langer <martin-langer@gmx.de>
8 Copyright (C) 2005 Stefano Brivio <stefano.brivio@polimi.it>
9 Copyright (C) 2005, 2006 Michael Buesch <mb@bu3sch.de>
10 Copyright (C) 2005 Danny van Dyk <kugelfang@gentoo.org>
11 Copyright (C) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>
13 This program is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2 of the License, or
16 (at your option) any later version.
18 This program is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 GNU General Public License for more details.
23 You should have received a copy of the GNU General Public License
24 along with this program; see the file COPYING. If not, write to
25 the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
26 Boston, MA 02110-1301, USA.
35 /* Extract the bitrate index out of a CCK PLCP header. */
36 static int b43_plcp_get_bitrate_idx_cck(struct b43_plcp_hdr6 *plcp)
38 switch (plcp->raw[0]) {
52 /* Extract the bitrate index out of an OFDM PLCP header. */
53 static u8 b43_plcp_get_bitrate_idx_ofdm(struct b43_plcp_hdr6 *plcp, bool aphy)
55 int base = aphy ? 0 : 4;
57 switch (plcp->raw[0] & 0xF) {
79 u8 b43_plcp_get_ratecode_cck(const u8 bitrate)
82 case B43_CCK_RATE_1MB:
84 case B43_CCK_RATE_2MB:
86 case B43_CCK_RATE_5MB:
88 case B43_CCK_RATE_11MB:
95 u8 b43_plcp_get_ratecode_ofdm(const u8 bitrate)
98 case B43_OFDM_RATE_6MB:
100 case B43_OFDM_RATE_9MB:
102 case B43_OFDM_RATE_12MB:
104 case B43_OFDM_RATE_18MB:
106 case B43_OFDM_RATE_24MB:
108 case B43_OFDM_RATE_36MB:
110 case B43_OFDM_RATE_48MB:
112 case B43_OFDM_RATE_54MB:
119 void b43_generate_plcp_hdr(struct b43_plcp_hdr4 *plcp,
120 const u16 octets, const u8 bitrate)
122 __le32 *data = &(plcp->data);
123 __u8 *raw = plcp->raw;
125 if (b43_is_ofdm_rate(bitrate)) {
128 d = b43_plcp_get_ratecode_ofdm(bitrate);
129 B43_WARN_ON(octets & 0xF000);
131 *data = cpu_to_le32(d);
135 plen = octets * 16 / bitrate;
136 if ((octets * 16 % bitrate) > 0) {
138 if ((bitrate == B43_CCK_RATE_11MB)
139 && ((octets * 8 % 11) < 4)) {
145 *data |= cpu_to_le32(plen << 16);
146 raw[0] = b43_plcp_get_ratecode_cck(bitrate);
150 static u8 b43_calc_fallback_rate(u8 bitrate)
153 case B43_CCK_RATE_1MB:
154 return B43_CCK_RATE_1MB;
155 case B43_CCK_RATE_2MB:
156 return B43_CCK_RATE_1MB;
157 case B43_CCK_RATE_5MB:
158 return B43_CCK_RATE_2MB;
159 case B43_CCK_RATE_11MB:
160 return B43_CCK_RATE_5MB;
161 case B43_OFDM_RATE_6MB:
162 return B43_CCK_RATE_5MB;
163 case B43_OFDM_RATE_9MB:
164 return B43_OFDM_RATE_6MB;
165 case B43_OFDM_RATE_12MB:
166 return B43_OFDM_RATE_9MB;
167 case B43_OFDM_RATE_18MB:
168 return B43_OFDM_RATE_12MB;
169 case B43_OFDM_RATE_24MB:
170 return B43_OFDM_RATE_18MB;
171 case B43_OFDM_RATE_36MB:
172 return B43_OFDM_RATE_24MB;
173 case B43_OFDM_RATE_48MB:
174 return B43_OFDM_RATE_36MB;
175 case B43_OFDM_RATE_54MB:
176 return B43_OFDM_RATE_48MB;
182 /* Generate a TX data header. */
183 int b43_generate_txhdr(struct b43_wldev *dev,
185 const unsigned char *fragment_data,
186 unsigned int fragment_len,
187 const struct ieee80211_tx_control *txctl,
190 struct b43_txhdr *txhdr = (struct b43_txhdr *)_txhdr;
191 const struct b43_phy *phy = &dev->phy;
192 const struct ieee80211_hdr *wlhdr =
193 (const struct ieee80211_hdr *)fragment_data;
194 int use_encryption = (!(txctl->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT));
195 u16 fctl = le16_to_cpu(wlhdr->frame_control);
196 struct ieee80211_rate *fbrate;
198 int rate_ofdm, rate_fb_ofdm;
199 unsigned int plcp_fragment_len;
204 memset(txhdr, 0, sizeof(*txhdr));
206 WARN_ON(!txctl->tx_rate);
207 rate = txctl->tx_rate ? txctl->tx_rate->hw_value : B43_CCK_RATE_1MB;
208 rate_ofdm = b43_is_ofdm_rate(rate);
209 fbrate = txctl->alt_retry_rate ? : txctl->tx_rate;
210 rate_fb = fbrate->hw_value;
211 rate_fb_ofdm = b43_is_ofdm_rate(rate_fb);
214 txhdr->phy_rate = b43_plcp_get_ratecode_ofdm(rate);
216 txhdr->phy_rate = b43_plcp_get_ratecode_cck(rate);
217 txhdr->mac_frame_ctl = wlhdr->frame_control;
218 memcpy(txhdr->tx_receiver, wlhdr->addr1, 6);
220 /* Calculate duration for fallback rate */
221 if ((rate_fb == rate) ||
222 (wlhdr->duration_id & cpu_to_le16(0x8000)) ||
223 (wlhdr->duration_id == cpu_to_le16(0))) {
224 /* If the fallback rate equals the normal rate or the
225 * dur_id field contains an AID, CFP magic or 0,
226 * use the original dur_id field. */
227 txhdr->dur_fb = wlhdr->duration_id;
229 txhdr->dur_fb = ieee80211_generic_frame_duration(dev->wl->hw,
235 plcp_fragment_len = fragment_len + FCS_LEN;
236 if (use_encryption) {
237 u8 key_idx = (u16) (txctl->key_idx);
242 B43_WARN_ON(key_idx >= dev->max_nr_keys);
243 key = &(dev->key[key_idx]);
245 if (unlikely(!key->keyconf)) {
246 /* This key is invalid. This might only happen
247 * in a short timeframe after machine resume before
248 * we were able to reconfigure keys.
249 * Drop this packet completely. Do not transmit it
250 * unencrypted to avoid leaking information. */
254 /* Hardware appends ICV. */
255 plcp_fragment_len += txctl->icv_len;
257 key_idx = b43_kidx_to_fw(dev, key_idx);
258 mac_ctl |= (key_idx << B43_TXH_MAC_KEYIDX_SHIFT) &
260 mac_ctl |= (key->algorithm << B43_TXH_MAC_KEYALG_SHIFT) &
262 wlhdr_len = ieee80211_get_hdrlen(fctl);
263 iv_len = min((size_t) txctl->iv_len,
264 ARRAY_SIZE(txhdr->iv));
265 memcpy(txhdr->iv, ((u8 *) wlhdr) + wlhdr_len, iv_len);
267 if (b43_is_old_txhdr_format(dev)) {
268 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->old_format.plcp),
269 plcp_fragment_len, rate);
271 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->new_format.plcp),
272 plcp_fragment_len, rate);
274 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->plcp_fb),
275 plcp_fragment_len, rate_fb);
277 /* Extra Frame Types */
279 extra_ft |= B43_TXH_EFT_FB_OFDM;
281 extra_ft |= B43_TXH_EFT_FB_CCK;
283 /* Set channel radio code. Note that the micrcode ORs 0x100 to
284 * this value before comparing it to the value in SHM, if this
287 txhdr->chan_radio_code = phy->channel;
289 /* PHY TX Control word */
291 phy_ctl |= B43_TXH_PHY_ENC_OFDM;
293 phy_ctl |= B43_TXH_PHY_ENC_CCK;
294 if (txctl->flags & IEEE80211_TXCTL_SHORT_PREAMBLE)
295 phy_ctl |= B43_TXH_PHY_SHORTPRMBL;
297 switch (b43_ieee80211_antenna_sanitize(dev, txctl->antenna_sel_tx)) {
298 case 0: /* Default */
299 phy_ctl |= B43_TXH_PHY_ANT01AUTO;
301 case 1: /* Antenna 0 */
302 phy_ctl |= B43_TXH_PHY_ANT0;
304 case 2: /* Antenna 1 */
305 phy_ctl |= B43_TXH_PHY_ANT1;
307 case 3: /* Antenna 2 */
308 phy_ctl |= B43_TXH_PHY_ANT2;
310 case 4: /* Antenna 3 */
311 phy_ctl |= B43_TXH_PHY_ANT3;
318 if (!(txctl->flags & IEEE80211_TXCTL_NO_ACK))
319 mac_ctl |= B43_TXH_MAC_ACK;
320 if (!(((fctl & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) &&
321 ((fctl & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)))
322 mac_ctl |= B43_TXH_MAC_HWSEQ;
323 if (txctl->flags & IEEE80211_TXCTL_FIRST_FRAGMENT)
324 mac_ctl |= B43_TXH_MAC_STMSDU;
325 if (phy->type == B43_PHYTYPE_A)
326 mac_ctl |= B43_TXH_MAC_5GHZ;
327 if (txctl->flags & IEEE80211_TXCTL_LONG_RETRY_LIMIT)
328 mac_ctl |= B43_TXH_MAC_LONGFRAME;
330 /* Generate the RTS or CTS-to-self frame */
331 if ((txctl->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
332 (txctl->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
334 struct ieee80211_hdr *hdr;
335 int rts_rate, rts_rate_fb;
336 int rts_rate_ofdm, rts_rate_fb_ofdm;
337 struct b43_plcp_hdr6 *plcp;
339 WARN_ON(!txctl->rts_cts_rate);
340 rts_rate = txctl->rts_cts_rate ? txctl->rts_cts_rate->hw_value : B43_CCK_RATE_1MB;
341 rts_rate_ofdm = b43_is_ofdm_rate(rts_rate);
342 rts_rate_fb = b43_calc_fallback_rate(rts_rate);
343 rts_rate_fb_ofdm = b43_is_ofdm_rate(rts_rate_fb);
345 if (txctl->flags & IEEE80211_TXCTL_USE_CTS_PROTECT) {
346 struct ieee80211_cts *cts;
348 if (b43_is_old_txhdr_format(dev)) {
349 cts = (struct ieee80211_cts *)
350 (txhdr->old_format.rts_frame);
352 cts = (struct ieee80211_cts *)
353 (txhdr->new_format.rts_frame);
355 ieee80211_ctstoself_get(dev->wl->hw, txctl->vif,
356 fragment_data, fragment_len,
358 mac_ctl |= B43_TXH_MAC_SENDCTS;
359 len = sizeof(struct ieee80211_cts);
361 struct ieee80211_rts *rts;
363 if (b43_is_old_txhdr_format(dev)) {
364 rts = (struct ieee80211_rts *)
365 (txhdr->old_format.rts_frame);
367 rts = (struct ieee80211_rts *)
368 (txhdr->new_format.rts_frame);
370 ieee80211_rts_get(dev->wl->hw, txctl->vif,
371 fragment_data, fragment_len,
373 mac_ctl |= B43_TXH_MAC_SENDRTS;
374 len = sizeof(struct ieee80211_rts);
378 /* Generate the PLCP headers for the RTS/CTS frame */
379 if (b43_is_old_txhdr_format(dev))
380 plcp = &txhdr->old_format.rts_plcp;
382 plcp = &txhdr->new_format.rts_plcp;
383 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
385 plcp = &txhdr->rts_plcp_fb;
386 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
389 if (b43_is_old_txhdr_format(dev)) {
390 hdr = (struct ieee80211_hdr *)
391 (&txhdr->old_format.rts_frame);
393 hdr = (struct ieee80211_hdr *)
394 (&txhdr->new_format.rts_frame);
396 txhdr->rts_dur_fb = hdr->duration_id;
399 extra_ft |= B43_TXH_EFT_RTS_OFDM;
400 txhdr->phy_rate_rts =
401 b43_plcp_get_ratecode_ofdm(rts_rate);
403 extra_ft |= B43_TXH_EFT_RTS_CCK;
404 txhdr->phy_rate_rts =
405 b43_plcp_get_ratecode_cck(rts_rate);
407 if (rts_rate_fb_ofdm)
408 extra_ft |= B43_TXH_EFT_RTSFB_OFDM;
410 extra_ft |= B43_TXH_EFT_RTSFB_CCK;
414 if (b43_is_old_txhdr_format(dev))
415 txhdr->old_format.cookie = cpu_to_le16(cookie);
417 txhdr->new_format.cookie = cpu_to_le16(cookie);
419 /* Apply the bitfields */
420 txhdr->mac_ctl = cpu_to_le32(mac_ctl);
421 txhdr->phy_ctl = cpu_to_le16(phy_ctl);
422 txhdr->extra_ft = extra_ft;
427 static s8 b43_rssi_postprocess(struct b43_wldev *dev,
428 u8 in_rssi, int ofdm,
429 int adjust_2053, int adjust_2050)
431 struct b43_phy *phy = &dev->phy;
434 switch (phy->radio_ver) {
447 if (dev->dev->bus->sprom.
448 boardflags_lo & B43_BFL_RSSI) {
451 tmp = phy->nrssi_lt[in_rssi];
463 if (phy->type == B43_PHYTYPE_G && adjust_2050)
489 static s8 b43_rssinoise_postprocess(struct b43_wldev *dev, u8 in_rssi)
491 struct b43_phy *phy = &dev->phy;
494 if (phy->type == B43_PHYTYPE_A) {
495 //TODO: Incomplete specs.
498 ret = b43_rssi_postprocess(dev, in_rssi, 0, 1, 1);
504 void b43_rx(struct b43_wldev *dev, struct sk_buff *skb, const void *_rxhdr)
506 struct ieee80211_rx_status status;
507 struct b43_plcp_hdr6 *plcp;
508 struct ieee80211_hdr *wlhdr;
509 const struct b43_rxhdr_fw4 *rxhdr = _rxhdr;
511 u16 phystat0, phystat3, chanstat, mactime;
518 memset(&status, 0, sizeof(status));
520 /* Get metadata about the frame from the header. */
521 phystat0 = le16_to_cpu(rxhdr->phy_status0);
522 phystat3 = le16_to_cpu(rxhdr->phy_status3);
524 macstat = le32_to_cpu(rxhdr->mac_status);
525 mactime = le16_to_cpu(rxhdr->mac_time);
526 chanstat = le16_to_cpu(rxhdr->channel);
527 phytype = chanstat & B43_RX_CHAN_PHYTYPE;
529 if (macstat & B43_RX_MAC_FCSERR)
530 dev->wl->ieee_stats.dot11FCSErrorCount++;
531 if (macstat & B43_RX_MAC_DECERR) {
532 /* Decryption with the given key failed.
533 * Drop the packet. We also won't be able to decrypt it with
534 * the key in software. */
538 /* Skip PLCP and padding */
539 padding = (macstat & B43_RX_MAC_PADDING) ? 2 : 0;
540 if (unlikely(skb->len < (sizeof(struct b43_plcp_hdr6) + padding))) {
541 b43dbg(dev->wl, "RX: Packet size underrun (1)\n");
544 plcp = (struct b43_plcp_hdr6 *)(skb->data + padding);
545 skb_pull(skb, sizeof(struct b43_plcp_hdr6) + padding);
546 /* The skb contains the Wireless Header + payload data now */
547 if (unlikely(skb->len < (2 + 2 + 6 /*minimum hdr */ + FCS_LEN))) {
548 b43dbg(dev->wl, "RX: Packet size underrun (2)\n");
551 wlhdr = (struct ieee80211_hdr *)(skb->data);
552 fctl = le16_to_cpu(wlhdr->frame_control);
554 if (macstat & B43_RX_MAC_DEC) {
558 keyidx = ((macstat & B43_RX_MAC_KEYIDX)
559 >> B43_RX_MAC_KEYIDX_SHIFT);
560 /* We must adjust the key index here. We want the "physical"
561 * key index, but the ucode passed it slightly different.
563 keyidx = b43_kidx_to_raw(dev, keyidx);
564 B43_WARN_ON(keyidx >= dev->max_nr_keys);
566 if (dev->key[keyidx].algorithm != B43_SEC_ALGO_NONE) {
567 wlhdr_len = ieee80211_get_hdrlen(fctl);
568 if (unlikely(skb->len < (wlhdr_len + 3))) {
570 "RX: Packet size underrun (3)\n");
573 status.flag |= RX_FLAG_DECRYPTED;
577 status.ssi = b43_rssi_postprocess(dev, jssi,
578 (phystat0 & B43_RX_PHYST0_OFDM),
579 (phystat0 & B43_RX_PHYST0_GAINCTL),
580 (phystat3 & B43_RX_PHYST3_TRSTATE));
581 status.noise = dev->stats.link_noise;
582 /* the next line looks wrong, but is what mac80211 wants */
583 status.signal = (jssi * 100) / B43_RX_MAX_SSI;
584 if (phystat0 & B43_RX_PHYST0_OFDM)
585 status.rate_idx = b43_plcp_get_bitrate_idx_ofdm(plcp,
586 phytype == B43_PHYTYPE_A);
588 status.rate_idx = b43_plcp_get_bitrate_idx_cck(plcp);
589 status.antenna = !!(phystat0 & B43_RX_PHYST0_ANT);
592 * All frames on monitor interfaces and beacons always need a full
593 * 64-bit timestamp. Monitor interfaces need it for diagnostic
594 * purposes and beacons for IBSS merging.
595 * This code assumes we get to process the packet within 16 bits
596 * of timestamp, i.e. about 65 milliseconds after the PHY received
599 if (((fctl & (IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE))
600 == (IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON)) ||
601 dev->wl->radiotap_enabled) {
604 b43_tsf_read(dev, &status.mactime);
605 low_mactime_now = status.mactime;
606 status.mactime = status.mactime & ~0xFFFFULL;
607 status.mactime += mactime;
608 if (low_mactime_now <= mactime)
609 status.mactime -= 0x10000;
610 status.flag |= RX_FLAG_TSFT;
613 chanid = (chanstat & B43_RX_CHAN_ID) >> B43_RX_CHAN_ID_SHIFT;
614 switch (chanstat & B43_RX_CHAN_PHYTYPE) {
616 status.band = IEEE80211_BAND_5GHZ;
618 /* FIXME: We don't really know which value the "chanid" contains.
619 * So the following assignment might be wrong. */
620 status.freq = b43_channel_to_freq_5ghz(chanid);
623 status.band = IEEE80211_BAND_2GHZ;
624 /* chanid is the radio channel cookie value as used
625 * to tune the radio. */
626 status.freq = chanid + 2400;
629 /* chanid is the SHM channel cookie. Which is the plain
630 * channel number in b43. */
631 if (chanstat & B43_RX_CHAN_5GHZ) {
632 status.band = IEEE80211_BAND_5GHZ;
633 status.freq = b43_freq_to_channel_5ghz(chanid);
635 status.band = IEEE80211_BAND_2GHZ;
636 status.freq = b43_freq_to_channel_2ghz(chanid);
644 dev->stats.last_rx = jiffies;
645 ieee80211_rx_irqsafe(dev->wl->hw, skb, &status);
649 b43dbg(dev->wl, "RX: Packet dropped\n");
650 dev_kfree_skb_any(skb);
653 void b43_handle_txstatus(struct b43_wldev *dev,
654 const struct b43_txstatus *status)
656 b43_debugfs_log_txstat(dev, status);
658 if (status->intermediate)
660 if (status->for_ampdu)
663 dev->wl->ieee_stats.dot11ACKFailureCount++;
664 if (status->rts_count) {
665 if (status->rts_count == 0xF) //FIXME
666 dev->wl->ieee_stats.dot11RTSFailureCount++;
668 dev->wl->ieee_stats.dot11RTSSuccessCount++;
671 b43_dma_handle_txstatus(dev, status);
674 /* Handle TX status report as received through DMA/PIO queues */
675 void b43_handle_hwtxstatus(struct b43_wldev *dev,
676 const struct b43_hwtxstatus *hw)
678 struct b43_txstatus status;
681 status.cookie = le16_to_cpu(hw->cookie);
682 status.seq = le16_to_cpu(hw->seq);
683 status.phy_stat = hw->phy_stat;
685 status.frame_count = (tmp >> 4);
686 status.rts_count = (tmp & 0x0F);
688 status.supp_reason = ((tmp & 0x1C) >> 2);
689 status.pm_indicated = !!(tmp & 0x80);
690 status.intermediate = !!(tmp & 0x40);
691 status.for_ampdu = !!(tmp & 0x20);
692 status.acked = !!(tmp & 0x02);
694 b43_handle_txstatus(dev, &status);
697 /* Stop any TX operation on the device (suspend the hardware queues) */
698 void b43_tx_suspend(struct b43_wldev *dev)
700 b43_dma_tx_suspend(dev);
703 /* Resume any TX operation on the device (resume the hardware queues) */
704 void b43_tx_resume(struct b43_wldev *dev)
706 b43_dma_tx_resume(dev);
710 static void upload_qos_parms(struct b43_wldev *dev,
711 const u16 * parms, u16 offset)
715 for (i = 0; i < B43_NR_QOSPARMS; i++) {
716 b43_shm_write16(dev, B43_SHM_SHARED,
717 offset + (i * 2), parms[i]);
722 /* Initialize the QoS parameters */
723 void b43_qos_init(struct b43_wldev *dev)
725 /* FIXME: This function must probably be called from the mac80211
726 * config callback. */
729 b43_hf_write(dev, b43_hf_read(dev) | B43_HF_EDCF);
731 b43_write16(dev, 0x688, b43_read16(dev, 0x688) | 0x4);
733 /*TODO: We might need some stack support here to get the values. */