Commit | Line | Data |
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e85d0918 | 1 | /* zd_mac.c |
459c51ad DD |
2 | * |
3 | * Copyright (c) 2007 Luis R. Rodriguez <mcgrof@winlab.rutgers.edu> | |
e85d0918 DD |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
20 | #include <linux/netdevice.h> | |
21 | #include <linux/etherdevice.h> | |
e85d0918 DD |
22 | #include <linux/usb.h> |
23 | #include <linux/jiffies.h> | |
24 | #include <net/ieee80211_radiotap.h> | |
25 | ||
26 | #include "zd_def.h" | |
27 | #include "zd_chip.h" | |
28 | #include "zd_mac.h" | |
29 | #include "zd_ieee80211.h" | |
e85d0918 | 30 | #include "zd_rf.h" |
e85d0918 | 31 | |
459c51ad DD |
32 | /* This table contains the hardware specific values for the modulation rates. */ |
33 | static const struct ieee80211_rate zd_rates[] = { | |
34 | { .rate = 10, | |
35 | .val = ZD_CCK_RATE_1M, | |
36 | .flags = IEEE80211_RATE_CCK }, | |
37 | { .rate = 20, | |
38 | .val = ZD_CCK_RATE_2M, | |
39 | .val2 = ZD_CCK_RATE_2M | ZD_CCK_PREA_SHORT, | |
40 | .flags = IEEE80211_RATE_CCK_2 }, | |
41 | { .rate = 55, | |
42 | .val = ZD_CCK_RATE_5_5M, | |
43 | .val2 = ZD_CCK_RATE_5_5M | ZD_CCK_PREA_SHORT, | |
44 | .flags = IEEE80211_RATE_CCK_2 }, | |
45 | { .rate = 110, | |
46 | .val = ZD_CCK_RATE_11M, | |
47 | .val2 = ZD_CCK_RATE_11M | ZD_CCK_PREA_SHORT, | |
48 | .flags = IEEE80211_RATE_CCK_2 }, | |
49 | { .rate = 60, | |
50 | .val = ZD_OFDM_RATE_6M, | |
51 | .flags = IEEE80211_RATE_OFDM }, | |
52 | { .rate = 90, | |
53 | .val = ZD_OFDM_RATE_9M, | |
54 | .flags = IEEE80211_RATE_OFDM }, | |
55 | { .rate = 120, | |
56 | .val = ZD_OFDM_RATE_12M, | |
57 | .flags = IEEE80211_RATE_OFDM }, | |
58 | { .rate = 180, | |
59 | .val = ZD_OFDM_RATE_18M, | |
60 | .flags = IEEE80211_RATE_OFDM }, | |
61 | { .rate = 240, | |
62 | .val = ZD_OFDM_RATE_24M, | |
63 | .flags = IEEE80211_RATE_OFDM }, | |
64 | { .rate = 360, | |
65 | .val = ZD_OFDM_RATE_36M, | |
66 | .flags = IEEE80211_RATE_OFDM }, | |
67 | { .rate = 480, | |
68 | .val = ZD_OFDM_RATE_48M, | |
69 | .flags = IEEE80211_RATE_OFDM }, | |
70 | { .rate = 540, | |
71 | .val = ZD_OFDM_RATE_54M, | |
72 | .flags = IEEE80211_RATE_OFDM }, | |
73 | }; | |
74 | ||
75 | static const struct ieee80211_channel zd_channels[] = { | |
76 | { .chan = 1, | |
77 | .freq = 2412}, | |
78 | { .chan = 2, | |
79 | .freq = 2417}, | |
80 | { .chan = 3, | |
81 | .freq = 2422}, | |
82 | { .chan = 4, | |
83 | .freq = 2427}, | |
84 | { .chan = 5, | |
85 | .freq = 2432}, | |
86 | { .chan = 6, | |
87 | .freq = 2437}, | |
88 | { .chan = 7, | |
89 | .freq = 2442}, | |
90 | { .chan = 8, | |
91 | .freq = 2447}, | |
92 | { .chan = 9, | |
93 | .freq = 2452}, | |
94 | { .chan = 10, | |
95 | .freq = 2457}, | |
96 | { .chan = 11, | |
97 | .freq = 2462}, | |
98 | { .chan = 12, | |
99 | .freq = 2467}, | |
100 | { .chan = 13, | |
101 | .freq = 2472}, | |
102 | { .chan = 14, | |
103 | .freq = 2484} | |
104 | }; | |
e85d0918 | 105 | |
583afd1e UK |
106 | static void housekeeping_init(struct zd_mac *mac); |
107 | static void housekeeping_enable(struct zd_mac *mac); | |
108 | static void housekeeping_disable(struct zd_mac *mac); | |
109 | ||
459c51ad | 110 | int zd_mac_preinit_hw(struct ieee80211_hw *hw) |
e85d0918 DD |
111 | { |
112 | int r; | |
e85d0918 | 113 | u8 addr[ETH_ALEN]; |
459c51ad | 114 | struct zd_mac *mac = zd_hw_mac(hw); |
74553aed DD |
115 | |
116 | r = zd_chip_read_mac_addr_fw(&mac->chip, addr); | |
117 | if (r) | |
118 | return r; | |
119 | ||
459c51ad DD |
120 | SET_IEEE80211_PERM_ADDR(hw, addr); |
121 | ||
74553aed DD |
122 | return 0; |
123 | } | |
124 | ||
459c51ad | 125 | int zd_mac_init_hw(struct ieee80211_hw *hw) |
74553aed DD |
126 | { |
127 | int r; | |
459c51ad | 128 | struct zd_mac *mac = zd_hw_mac(hw); |
74553aed | 129 | struct zd_chip *chip = &mac->chip; |
e85d0918 DD |
130 | u8 default_regdomain; |
131 | ||
132 | r = zd_chip_enable_int(chip); | |
133 | if (r) | |
134 | goto out; | |
74553aed | 135 | r = zd_chip_init_hw(chip); |
e85d0918 DD |
136 | if (r) |
137 | goto disable_int; | |
138 | ||
e85d0918 | 139 | ZD_ASSERT(!irqs_disabled()); |
e85d0918 DD |
140 | |
141 | r = zd_read_regdomain(chip, &default_regdomain); | |
142 | if (r) | |
143 | goto disable_int; | |
e85d0918 DD |
144 | spin_lock_irq(&mac->lock); |
145 | mac->regdomain = mac->default_regdomain = default_regdomain; | |
146 | spin_unlock_irq(&mac->lock); | |
e85d0918 | 147 | |
40da08bc DD |
148 | /* We must inform the device that we are doing encryption/decryption in |
149 | * software at the moment. */ | |
150 | r = zd_set_encryption_type(chip, ENC_SNIFFER); | |
e85d0918 DD |
151 | if (r) |
152 | goto disable_int; | |
153 | ||
459c51ad | 154 | zd_geo_init(hw, mac->regdomain); |
e85d0918 DD |
155 | |
156 | r = 0; | |
157 | disable_int: | |
158 | zd_chip_disable_int(chip); | |
159 | out: | |
160 | return r; | |
161 | } | |
162 | ||
163 | void zd_mac_clear(struct zd_mac *mac) | |
164 | { | |
9cdac965 | 165 | flush_workqueue(zd_workqueue); |
e85d0918 | 166 | zd_chip_clear(&mac->chip); |
c48cf125 UK |
167 | ZD_ASSERT(!spin_is_locked(&mac->lock)); |
168 | ZD_MEMCLEAR(mac, sizeof(struct zd_mac)); | |
e85d0918 DD |
169 | } |
170 | ||
c5691235 | 171 | static int set_rx_filter(struct zd_mac *mac) |
e85d0918 | 172 | { |
459c51ad DD |
173 | unsigned long flags; |
174 | u32 filter = STA_RX_FILTER; | |
e85d0918 | 175 | |
459c51ad DD |
176 | spin_lock_irqsave(&mac->lock, flags); |
177 | if (mac->pass_ctrl) | |
178 | filter |= RX_FILTER_CTRL; | |
179 | spin_unlock_irqrestore(&mac->lock, flags); | |
180 | ||
181 | return zd_iowrite32(&mac->chip, CR_RX_FILTER, filter); | |
c5691235 UK |
182 | } |
183 | ||
184 | static int set_mc_hash(struct zd_mac *mac) | |
185 | { | |
186 | struct zd_mc_hash hash; | |
c5691235 | 187 | zd_mc_clear(&hash); |
c5691235 UK |
188 | return zd_chip_set_multicast_hash(&mac->chip, &hash); |
189 | } | |
190 | ||
459c51ad | 191 | static int zd_op_start(struct ieee80211_hw *hw) |
e85d0918 | 192 | { |
459c51ad | 193 | struct zd_mac *mac = zd_hw_mac(hw); |
e85d0918 | 194 | struct zd_chip *chip = &mac->chip; |
74553aed | 195 | struct zd_usb *usb = &chip->usb; |
e85d0918 DD |
196 | int r; |
197 | ||
74553aed DD |
198 | if (!usb->initialized) { |
199 | r = zd_usb_init_hw(usb); | |
200 | if (r) | |
201 | goto out; | |
202 | } | |
203 | ||
e85d0918 DD |
204 | r = zd_chip_enable_int(chip); |
205 | if (r < 0) | |
206 | goto out; | |
207 | ||
208 | r = zd_chip_set_basic_rates(chip, CR_RATES_80211B | CR_RATES_80211G); | |
209 | if (r < 0) | |
210 | goto disable_int; | |
c5691235 | 211 | r = set_rx_filter(mac); |
c5691235 UK |
212 | if (r) |
213 | goto disable_int; | |
214 | r = set_mc_hash(mac); | |
e85d0918 DD |
215 | if (r) |
216 | goto disable_int; | |
217 | r = zd_chip_switch_radio_on(chip); | |
218 | if (r < 0) | |
219 | goto disable_int; | |
459c51ad | 220 | r = zd_chip_enable_rxtx(chip); |
e85d0918 DD |
221 | if (r < 0) |
222 | goto disable_radio; | |
223 | r = zd_chip_enable_hwint(chip); | |
224 | if (r < 0) | |
459c51ad | 225 | goto disable_rxtx; |
e85d0918 | 226 | |
583afd1e | 227 | housekeeping_enable(mac); |
e85d0918 | 228 | return 0; |
459c51ad DD |
229 | disable_rxtx: |
230 | zd_chip_disable_rxtx(chip); | |
e85d0918 DD |
231 | disable_radio: |
232 | zd_chip_switch_radio_off(chip); | |
233 | disable_int: | |
234 | zd_chip_disable_int(chip); | |
235 | out: | |
236 | return r; | |
237 | } | |
238 | ||
459c51ad DD |
239 | /** |
240 | * clear_tx_skb_control_block - clears the control block of tx skbuffs | |
241 | * @skb: a &struct sk_buff pointer | |
242 | * | |
243 | * This clears the control block of skbuff buffers, which were transmitted to | |
244 | * the device. Notify that the function is not thread-safe, so prevent | |
245 | * multiple calls. | |
246 | */ | |
247 | static void clear_tx_skb_control_block(struct sk_buff *skb) | |
248 | { | |
249 | struct zd_tx_skb_control_block *cb = | |
250 | (struct zd_tx_skb_control_block *)skb->cb; | |
251 | ||
252 | kfree(cb->control); | |
253 | cb->control = NULL; | |
254 | } | |
255 | ||
256 | /** | |
257 | * kfree_tx_skb - frees a tx skbuff | |
258 | * @skb: a &struct sk_buff pointer | |
259 | * | |
260 | * Frees the tx skbuff. Frees also the allocated control structure in the | |
261 | * control block if necessary. | |
262 | */ | |
263 | static void kfree_tx_skb(struct sk_buff *skb) | |
e85d0918 | 264 | { |
459c51ad DD |
265 | clear_tx_skb_control_block(skb); |
266 | dev_kfree_skb_any(skb); | |
267 | } | |
e85d0918 | 268 | |
459c51ad DD |
269 | static void zd_op_stop(struct ieee80211_hw *hw) |
270 | { | |
271 | struct zd_mac *mac = zd_hw_mac(hw); | |
272 | struct zd_chip *chip = &mac->chip; | |
273 | struct sk_buff *skb; | |
274 | struct sk_buff_head *ack_wait_queue = &mac->ack_wait_queue; | |
c9a4b35d | 275 | |
459c51ad | 276 | /* The order here deliberately is a little different from the open() |
e85d0918 | 277 | * method, since we need to make sure there is no opportunity for RX |
459c51ad | 278 | * frames to be processed by mac80211 after we have stopped it. |
e85d0918 DD |
279 | */ |
280 | ||
459c51ad | 281 | zd_chip_disable_rxtx(chip); |
583afd1e | 282 | housekeeping_disable(mac); |
b1382ede | 283 | flush_workqueue(zd_workqueue); |
b1382ede | 284 | |
e85d0918 DD |
285 | zd_chip_disable_hwint(chip); |
286 | zd_chip_switch_radio_off(chip); | |
287 | zd_chip_disable_int(chip); | |
288 | ||
e85d0918 | 289 | |
459c51ad DD |
290 | while ((skb = skb_dequeue(ack_wait_queue))) |
291 | kfree_tx_skb(skb); | |
9cdac965 UK |
292 | } |
293 | ||
459c51ad DD |
294 | /** |
295 | * init_tx_skb_control_block - initializes skb control block | |
296 | * @skb: a &sk_buff pointer | |
297 | * @dev: pointer to the mac80221 device | |
298 | * @control: mac80211 tx control applying for the frame in @skb | |
299 | * | |
300 | * Initializes the control block of the skbuff to be transmitted. | |
301 | */ | |
302 | static int init_tx_skb_control_block(struct sk_buff *skb, | |
303 | struct ieee80211_hw *hw, | |
304 | struct ieee80211_tx_control *control) | |
305 | { | |
306 | struct zd_tx_skb_control_block *cb = | |
307 | (struct zd_tx_skb_control_block *)skb->cb; | |
308 | ||
309 | ZD_ASSERT(sizeof(*cb) <= sizeof(skb->cb)); | |
310 | memset(cb, 0, sizeof(*cb)); | |
311 | cb->hw= hw; | |
312 | cb->control = kmalloc(sizeof(*control), GFP_ATOMIC); | |
313 | if (cb->control == NULL) | |
314 | return -ENOMEM; | |
315 | memcpy(cb->control, control, sizeof(*control)); | |
e85d0918 DD |
316 | |
317 | return 0; | |
318 | } | |
319 | ||
459c51ad DD |
320 | /** |
321 | * tx_status - reports tx status of a packet if required | |
322 | * @hw - a &struct ieee80211_hw pointer | |
323 | * @skb - a sk-buffer | |
324 | * @status - the tx status of the packet without control information | |
325 | * @success - True for successfull transmission of the frame | |
326 | * | |
327 | * This information calls ieee80211_tx_status_irqsafe() if required by the | |
328 | * control information. It copies the control information into the status | |
329 | * information. | |
330 | * | |
331 | * If no status information has been requested, the skb is freed. | |
332 | */ | |
333 | static void tx_status(struct ieee80211_hw *hw, struct sk_buff *skb, | |
334 | struct ieee80211_tx_status *status, | |
335 | bool success) | |
b1382ede | 336 | { |
459c51ad DD |
337 | struct zd_tx_skb_control_block *cb = (struct zd_tx_skb_control_block *) |
338 | skb->cb; | |
b1382ede | 339 | |
459c51ad DD |
340 | ZD_ASSERT(cb->control != NULL); |
341 | memcpy(&status->control, cb->control, sizeof(status->control)); | |
342 | if (!success) | |
343 | status->excessive_retries = 1; | |
344 | clear_tx_skb_control_block(skb); | |
345 | ieee80211_tx_status_irqsafe(hw, skb, status); | |
b1382ede DD |
346 | } |
347 | ||
459c51ad DD |
348 | /** |
349 | * zd_mac_tx_failed - callback for failed frames | |
350 | * @dev: the mac80211 wireless device | |
351 | * | |
352 | * This function is called if a frame couldn't be succesfully be | |
353 | * transferred. The first frame from the tx queue, will be selected and | |
354 | * reported as error to the upper layers. | |
355 | */ | |
356 | void zd_mac_tx_failed(struct ieee80211_hw *hw) | |
b1382ede | 357 | { |
459c51ad DD |
358 | struct sk_buff_head *q = &zd_hw_mac(hw)->ack_wait_queue; |
359 | struct sk_buff *skb; | |
360 | struct ieee80211_tx_status status = {{0}}; | |
b1382ede | 361 | |
459c51ad DD |
362 | skb = skb_dequeue(q); |
363 | if (skb == NULL) | |
364 | return; | |
365 | tx_status(hw, skb, &status, 0); | |
b1382ede DD |
366 | } |
367 | ||
459c51ad DD |
368 | /** |
369 | * zd_mac_tx_to_dev - callback for USB layer | |
370 | * @skb: a &sk_buff pointer | |
371 | * @error: error value, 0 if transmission successful | |
372 | * | |
373 | * Informs the MAC layer that the frame has successfully transferred to the | |
374 | * device. If an ACK is required and the transfer to the device has been | |
375 | * successful, the packets are put on the @ack_wait_queue with | |
376 | * the control set removed. | |
377 | */ | |
378 | void zd_mac_tx_to_dev(struct sk_buff *skb, int error) | |
379 | { | |
380 | struct zd_tx_skb_control_block *cb = | |
381 | (struct zd_tx_skb_control_block *)skb->cb; | |
382 | struct ieee80211_hw *hw = cb->hw; | |
383 | ||
384 | if (likely(cb->control)) { | |
385 | skb_pull(skb, sizeof(struct zd_ctrlset)); | |
386 | if (unlikely(error || | |
387 | (cb->control->flags & IEEE80211_TXCTL_NO_ACK))) | |
388 | { | |
389 | struct ieee80211_tx_status status = {{0}}; | |
390 | tx_status(hw, skb, &status, !error); | |
b1382ede | 391 | } else { |
459c51ad DD |
392 | struct sk_buff_head *q = |
393 | &zd_hw_mac(hw)->ack_wait_queue; | |
b1382ede | 394 | |
459c51ad DD |
395 | skb_queue_tail(q, skb); |
396 | while (skb_queue_len(q) > ZD_MAC_MAX_ACK_WAITERS) | |
397 | zd_mac_tx_failed(hw); | |
b1382ede | 398 | } |
459c51ad DD |
399 | } else { |
400 | kfree_tx_skb(skb); | |
e85d0918 | 401 | } |
e85d0918 DD |
402 | } |
403 | ||
b1cd8416 | 404 | static int zd_calc_tx_length_us(u8 *service, u8 zd_rate, u16 tx_length) |
e85d0918 | 405 | { |
64f222cc | 406 | /* ZD_PURE_RATE() must be used to remove the modulation type flag of |
459c51ad DD |
407 | * the zd-rate values. |
408 | */ | |
e85d0918 | 409 | static const u8 rate_divisor[] = { |
459c51ad DD |
410 | [ZD_PURE_RATE(ZD_CCK_RATE_1M)] = 1, |
411 | [ZD_PURE_RATE(ZD_CCK_RATE_2M)] = 2, | |
412 | /* Bits must be doubled. */ | |
413 | [ZD_PURE_RATE(ZD_CCK_RATE_5_5M)] = 11, | |
414 | [ZD_PURE_RATE(ZD_CCK_RATE_11M)] = 11, | |
415 | [ZD_PURE_RATE(ZD_OFDM_RATE_6M)] = 6, | |
416 | [ZD_PURE_RATE(ZD_OFDM_RATE_9M)] = 9, | |
417 | [ZD_PURE_RATE(ZD_OFDM_RATE_12M)] = 12, | |
418 | [ZD_PURE_RATE(ZD_OFDM_RATE_18M)] = 18, | |
419 | [ZD_PURE_RATE(ZD_OFDM_RATE_24M)] = 24, | |
420 | [ZD_PURE_RATE(ZD_OFDM_RATE_36M)] = 36, | |
421 | [ZD_PURE_RATE(ZD_OFDM_RATE_48M)] = 48, | |
422 | [ZD_PURE_RATE(ZD_OFDM_RATE_54M)] = 54, | |
e85d0918 DD |
423 | }; |
424 | ||
425 | u32 bits = (u32)tx_length * 8; | |
426 | u32 divisor; | |
427 | ||
64f222cc | 428 | divisor = rate_divisor[ZD_PURE_RATE(zd_rate)]; |
e85d0918 DD |
429 | if (divisor == 0) |
430 | return -EINVAL; | |
431 | ||
b1cd8416 DD |
432 | switch (zd_rate) { |
433 | case ZD_CCK_RATE_5_5M: | |
e85d0918 DD |
434 | bits = (2*bits) + 10; /* round up to the next integer */ |
435 | break; | |
b1cd8416 | 436 | case ZD_CCK_RATE_11M: |
e85d0918 DD |
437 | if (service) { |
438 | u32 t = bits % 11; | |
439 | *service &= ~ZD_PLCP_SERVICE_LENGTH_EXTENSION; | |
440 | if (0 < t && t <= 3) { | |
441 | *service |= ZD_PLCP_SERVICE_LENGTH_EXTENSION; | |
442 | } | |
443 | } | |
444 | bits += 10; /* round up to the next integer */ | |
445 | break; | |
446 | } | |
447 | ||
448 | return bits/divisor; | |
449 | } | |
450 | ||
e85d0918 | 451 | static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs, |
459c51ad | 452 | struct ieee80211_hdr *header, u32 flags) |
e85d0918 | 453 | { |
459c51ad | 454 | u16 fctl = le16_to_cpu(header->frame_control); |
e85d0918 DD |
455 | |
456 | /* | |
b1382ede | 457 | * CONTROL TODO: |
e85d0918 DD |
458 | * - if backoff needed, enable bit 0 |
459 | * - if burst (backoff not needed) disable bit 0 | |
e85d0918 DD |
460 | */ |
461 | ||
462 | cs->control = 0; | |
463 | ||
464 | /* First fragment */ | |
459c51ad | 465 | if (flags & IEEE80211_TXCTL_FIRST_FRAGMENT) |
e85d0918 DD |
466 | cs->control |= ZD_CS_NEED_RANDOM_BACKOFF; |
467 | ||
468 | /* Multicast */ | |
469 | if (is_multicast_ether_addr(header->addr1)) | |
470 | cs->control |= ZD_CS_MULTICAST; | |
471 | ||
472 | /* PS-POLL */ | |
459c51ad DD |
473 | if ((fctl & (IEEE80211_FCTL_FTYPE|IEEE80211_FCTL_STYPE)) == |
474 | (IEEE80211_FTYPE_CTL|IEEE80211_STYPE_PSPOLL)) | |
e85d0918 DD |
475 | cs->control |= ZD_CS_PS_POLL_FRAME; |
476 | ||
459c51ad | 477 | if (flags & IEEE80211_TXCTL_USE_RTS_CTS) |
b1382ede DD |
478 | cs->control |= ZD_CS_RTS; |
479 | ||
459c51ad | 480 | if (flags & IEEE80211_TXCTL_USE_CTS_PROTECT) |
b1382ede | 481 | cs->control |= ZD_CS_SELF_CTS; |
e85d0918 DD |
482 | |
483 | /* FIXME: Management frame? */ | |
484 | } | |
485 | ||
486 | static int fill_ctrlset(struct zd_mac *mac, | |
459c51ad DD |
487 | struct sk_buff *skb, |
488 | struct ieee80211_tx_control *control) | |
e85d0918 DD |
489 | { |
490 | int r; | |
459c51ad DD |
491 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
492 | unsigned int frag_len = skb->len + FCS_LEN; | |
e85d0918 DD |
493 | unsigned int packet_length; |
494 | struct zd_ctrlset *cs = (struct zd_ctrlset *) | |
495 | skb_push(skb, sizeof(struct zd_ctrlset)); | |
496 | ||
e85d0918 | 497 | ZD_ASSERT(frag_len <= 0xffff); |
e85d0918 | 498 | |
459c51ad | 499 | cs->modulation = control->tx_rate; |
e85d0918 DD |
500 | |
501 | cs->tx_length = cpu_to_le16(frag_len); | |
502 | ||
459c51ad | 503 | cs_set_control(mac, cs, hdr, control->flags); |
e85d0918 DD |
504 | |
505 | packet_length = frag_len + sizeof(struct zd_ctrlset) + 10; | |
506 | ZD_ASSERT(packet_length <= 0xffff); | |
507 | /* ZD1211B: Computing the length difference this way, gives us | |
508 | * flexibility to compute the packet length. | |
509 | */ | |
74553aed | 510 | cs->packet_length = cpu_to_le16(zd_chip_is_zd1211b(&mac->chip) ? |
e85d0918 DD |
511 | packet_length - frag_len : packet_length); |
512 | ||
513 | /* | |
514 | * CURRENT LENGTH: | |
515 | * - transmit frame length in microseconds | |
516 | * - seems to be derived from frame length | |
517 | * - see Cal_Us_Service() in zdinlinef.h | |
518 | * - if macp->bTxBurstEnable is enabled, then multiply by 4 | |
519 | * - bTxBurstEnable is never set in the vendor driver | |
520 | * | |
521 | * SERVICE: | |
522 | * - "for PLCP configuration" | |
523 | * - always 0 except in some situations at 802.11b 11M | |
524 | * - see line 53 of zdinlinef.h | |
525 | */ | |
526 | cs->service = 0; | |
64f222cc | 527 | r = zd_calc_tx_length_us(&cs->service, ZD_RATE(cs->modulation), |
e85d0918 DD |
528 | le16_to_cpu(cs->tx_length)); |
529 | if (r < 0) | |
530 | return r; | |
531 | cs->current_length = cpu_to_le16(r); | |
459c51ad | 532 | cs->next_frame_length = 0; |
e85d0918 DD |
533 | |
534 | return 0; | |
535 | } | |
536 | ||
459c51ad DD |
537 | /** |
538 | * zd_op_tx - transmits a network frame to the device | |
539 | * | |
540 | * @dev: mac80211 hardware device | |
541 | * @skb: socket buffer | |
542 | * @control: the control structure | |
543 | * | |
544 | * This function transmit an IEEE 802.11 network frame to the device. The | |
545 | * control block of the skbuff will be initialized. If necessary the incoming | |
546 | * mac80211 queues will be stopped. | |
547 | */ | |
548 | static int zd_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
549 | struct ieee80211_tx_control *control) | |
e85d0918 | 550 | { |
459c51ad DD |
551 | struct zd_mac *mac = zd_hw_mac(hw); |
552 | int r; | |
e85d0918 | 553 | |
459c51ad DD |
554 | r = fill_ctrlset(mac, skb, control); |
555 | if (r) | |
556 | return r; | |
e85d0918 | 557 | |
459c51ad DD |
558 | r = init_tx_skb_control_block(skb, hw, control); |
559 | if (r) | |
560 | return r; | |
561 | r = zd_usb_tx(&mac->chip.usb, skb); | |
562 | if (r) { | |
563 | clear_tx_skb_control_block(skb); | |
564 | return r; | |
e85d0918 | 565 | } |
e85d0918 DD |
566 | return 0; |
567 | } | |
568 | ||
459c51ad DD |
569 | /** |
570 | * filter_ack - filters incoming packets for acknowledgements | |
571 | * @dev: the mac80211 device | |
572 | * @rx_hdr: received header | |
573 | * @stats: the status for the received packet | |
741fec53 | 574 | * |
459c51ad DD |
575 | * This functions looks for ACK packets and tries to match them with the |
576 | * frames in the tx queue. If a match is found the frame will be dequeued and | |
577 | * the upper layers is informed about the successful transmission. If | |
578 | * mac80211 queues have been stopped and the number of frames still to be | |
579 | * transmitted is low the queues will be opened again. | |
e85d0918 | 580 | * |
459c51ad | 581 | * Returns 1 if the frame was an ACK, 0 if it was ignored. |
e85d0918 | 582 | */ |
459c51ad DD |
583 | static int filter_ack(struct ieee80211_hw *hw, struct ieee80211_hdr *rx_hdr, |
584 | struct ieee80211_rx_status *stats) | |
e85d0918 | 585 | { |
459c51ad DD |
586 | u16 fc = le16_to_cpu(rx_hdr->frame_control); |
587 | struct sk_buff *skb; | |
588 | struct sk_buff_head *q; | |
589 | unsigned long flags; | |
e85d0918 | 590 | |
459c51ad DD |
591 | if ((fc & (IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) != |
592 | (IEEE80211_FTYPE_CTL | IEEE80211_STYPE_ACK)) | |
e85d0918 | 593 | return 0; |
e85d0918 | 594 | |
459c51ad DD |
595 | q = &zd_hw_mac(hw)->ack_wait_queue; |
596 | spin_lock_irqsave(&q->lock, flags); | |
597 | for (skb = q->next; skb != (struct sk_buff *)q; skb = skb->next) { | |
598 | struct ieee80211_hdr *tx_hdr; | |
599 | ||
600 | tx_hdr = (struct ieee80211_hdr *)skb->data; | |
601 | if (likely(!compare_ether_addr(tx_hdr->addr2, rx_hdr->addr1))) | |
602 | { | |
603 | struct ieee80211_tx_status status = {{0}}; | |
604 | status.flags = IEEE80211_TX_STATUS_ACK; | |
605 | status.ack_signal = stats->ssi; | |
606 | __skb_unlink(skb, q); | |
607 | tx_status(hw, skb, &status, 1); | |
608 | goto out; | |
609 | } | |
610 | } | |
611 | out: | |
612 | spin_unlock_irqrestore(&q->lock, flags); | |
613 | return 1; | |
e85d0918 DD |
614 | } |
615 | ||
459c51ad | 616 | int zd_mac_rx(struct ieee80211_hw *hw, const u8 *buffer, unsigned int length) |
e85d0918 | 617 | { |
459c51ad DD |
618 | struct zd_mac *mac = zd_hw_mac(hw); |
619 | struct ieee80211_rx_status stats; | |
620 | const struct rx_status *status; | |
621 | struct sk_buff *skb; | |
622 | int bad_frame = 0; | |
db888aed | 623 | |
459c51ad DD |
624 | if (length < ZD_PLCP_HEADER_SIZE + 10 /* IEEE80211_1ADDR_LEN */ + |
625 | FCS_LEN + sizeof(struct rx_status)) | |
626 | return -EINVAL; | |
e85d0918 | 627 | |
459c51ad | 628 | memset(&stats, 0, sizeof(stats)); |
e85d0918 | 629 | |
459c51ad DD |
630 | /* Note about pass_failed_fcs and pass_ctrl access below: |
631 | * mac locking intentionally omitted here, as this is the only unlocked | |
632 | * reader and the only writer is configure_filter. Plus, if there were | |
633 | * any races accessing these variables, it wouldn't really matter. | |
634 | * If mac80211 ever provides a way for us to access filter flags | |
635 | * from outside configure_filter, we could improve on this. Also, this | |
636 | * situation may change once we implement some kind of DMA-into-skb | |
637 | * RX path. */ | |
e85d0918 | 638 | |
459c51ad DD |
639 | /* Caller has to ensure that length >= sizeof(struct rx_status). */ |
640 | status = (struct rx_status *) | |
937a049d | 641 | (buffer + (length - sizeof(struct rx_status))); |
e85d0918 | 642 | if (status->frame_status & ZD_RX_ERROR) { |
459c51ad DD |
643 | if (mac->pass_failed_fcs && |
644 | (status->frame_status & ZD_RX_CRC32_ERROR)) { | |
645 | stats.flag |= RX_FLAG_FAILED_FCS_CRC; | |
646 | bad_frame = 1; | |
647 | } else { | |
648 | return -EINVAL; | |
22d3405f | 649 | } |
e85d0918 | 650 | } |
22d3405f | 651 | |
459c51ad DD |
652 | stats.channel = _zd_chip_get_channel(&mac->chip); |
653 | stats.freq = zd_channels[stats.channel - 1].freq; | |
654 | stats.phymode = MODE_IEEE80211G; | |
655 | stats.ssi = status->signal_strength; | |
656 | stats.signal = zd_rx_qual_percent(buffer, | |
e85d0918 DD |
657 | length - sizeof(struct rx_status), |
658 | status); | |
459c51ad DD |
659 | stats.rate = zd_rx_rate(buffer, status); |
660 | ||
661 | length -= ZD_PLCP_HEADER_SIZE + sizeof(struct rx_status); | |
662 | buffer += ZD_PLCP_HEADER_SIZE; | |
663 | ||
664 | /* Except for bad frames, filter each frame to see if it is an ACK, in | |
665 | * which case our internal TX tracking is updated. Normally we then | |
666 | * bail here as there's no need to pass ACKs on up to the stack, but | |
667 | * there is also the case where the stack has requested us to pass | |
668 | * control frames on up (pass_ctrl) which we must consider. */ | |
669 | if (!bad_frame && | |
670 | filter_ack(hw, (struct ieee80211_hdr *)buffer, &stats) | |
671 | && !mac->pass_ctrl) | |
672 | return 0; | |
e85d0918 | 673 | |
459c51ad DD |
674 | skb = dev_alloc_skb(length); |
675 | if (skb == NULL) | |
676 | return -ENOMEM; | |
677 | memcpy(skb_put(skb, length), buffer, length); | |
678 | ||
679 | ieee80211_rx_irqsafe(hw, skb, &stats); | |
e85d0918 DD |
680 | return 0; |
681 | } | |
682 | ||
459c51ad DD |
683 | static int zd_op_add_interface(struct ieee80211_hw *hw, |
684 | struct ieee80211_if_init_conf *conf) | |
e85d0918 | 685 | { |
459c51ad | 686 | struct zd_mac *mac = zd_hw_mac(hw); |
e85d0918 | 687 | |
459c51ad DD |
688 | /* using IEEE80211_IF_TYPE_INVALID to indicate no mode selected */ |
689 | if (mac->type != IEEE80211_IF_TYPE_INVALID) | |
690 | return -EOPNOTSUPP; | |
e85d0918 | 691 | |
459c51ad DD |
692 | switch (conf->type) { |
693 | case IEEE80211_IF_TYPE_MNTR: | |
694 | case IEEE80211_IF_TYPE_STA: | |
695 | mac->type = conf->type; | |
696 | break; | |
697 | default: | |
698 | return -EOPNOTSUPP; | |
4d1feabc | 699 | } |
e85d0918 | 700 | |
459c51ad DD |
701 | return zd_write_mac_addr(&mac->chip, conf->mac_addr); |
702 | } | |
e85d0918 | 703 | |
459c51ad DD |
704 | static void zd_op_remove_interface(struct ieee80211_hw *hw, |
705 | struct ieee80211_if_init_conf *conf) | |
706 | { | |
707 | struct zd_mac *mac = zd_hw_mac(hw); | |
708 | mac->type = IEEE80211_IF_TYPE_INVALID; | |
709 | zd_write_mac_addr(&mac->chip, NULL); | |
710 | } | |
93137943 | 711 | |
459c51ad DD |
712 | static int zd_op_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf) |
713 | { | |
714 | struct zd_mac *mac = zd_hw_mac(hw); | |
715 | return zd_chip_set_channel(&mac->chip, conf->channel); | |
716 | } | |
db888aed | 717 | |
459c51ad DD |
718 | static int zd_op_config_interface(struct ieee80211_hw *hw, int if_id, |
719 | struct ieee80211_if_conf *conf) | |
720 | { | |
721 | struct zd_mac *mac = zd_hw_mac(hw); | |
e85d0918 | 722 | |
459c51ad DD |
723 | spin_lock_irq(&mac->lock); |
724 | mac->associated = is_valid_ether_addr(conf->bssid); | |
725 | spin_unlock_irq(&mac->lock); | |
e85d0918 | 726 | |
459c51ad DD |
727 | /* TODO: do hardware bssid filtering */ |
728 | return 0; | |
4d1feabc UK |
729 | } |
730 | ||
459c51ad | 731 | static void set_multicast_hash_handler(struct work_struct *work) |
4d1feabc | 732 | { |
459c51ad DD |
733 | struct zd_mac *mac = |
734 | container_of(work, struct zd_mac, set_multicast_hash_work); | |
735 | struct zd_mc_hash hash; | |
4d1feabc | 736 | |
459c51ad DD |
737 | spin_lock_irq(&mac->lock); |
738 | hash = mac->multicast_hash; | |
739 | spin_unlock_irq(&mac->lock); | |
4d1feabc | 740 | |
459c51ad | 741 | zd_chip_set_multicast_hash(&mac->chip, &hash); |
e85d0918 DD |
742 | } |
743 | ||
459c51ad | 744 | static void set_rx_filter_handler(struct work_struct *work) |
e85d0918 | 745 | { |
459c51ad DD |
746 | struct zd_mac *mac = |
747 | container_of(work, struct zd_mac, set_rx_filter_work); | |
748 | int r; | |
749 | ||
750 | dev_dbg_f(zd_mac_dev(mac), "\n"); | |
751 | r = set_rx_filter(mac); | |
752 | if (r) | |
753 | dev_err(zd_mac_dev(mac), "set_rx_filter_handler error %d\n", r); | |
e85d0918 DD |
754 | } |
755 | ||
459c51ad DD |
756 | #define SUPPORTED_FIF_FLAGS \ |
757 | (FIF_PROMISC_IN_BSS | FIF_ALLMULTI | FIF_FCSFAIL | FIF_CONTROL | \ | |
758 | FIF_OTHER_BSS) | |
759 | static void zd_op_configure_filter(struct ieee80211_hw *hw, | |
760 | unsigned int changed_flags, | |
761 | unsigned int *new_flags, | |
762 | int mc_count, struct dev_mc_list *mclist) | |
e85d0918 | 763 | { |
459c51ad DD |
764 | struct zd_mc_hash hash; |
765 | struct zd_mac *mac = zd_hw_mac(hw); | |
766 | unsigned long flags; | |
767 | int i; | |
e85d0918 | 768 | |
459c51ad DD |
769 | /* Only deal with supported flags */ |
770 | changed_flags &= SUPPORTED_FIF_FLAGS; | |
771 | *new_flags &= SUPPORTED_FIF_FLAGS; | |
772 | ||
773 | /* changed_flags is always populated but this driver | |
774 | * doesn't support all FIF flags so its possible we don't | |
775 | * need to do anything */ | |
776 | if (!changed_flags) | |
777 | return; | |
778 | ||
779 | if (*new_flags & (FIF_PROMISC_IN_BSS | FIF_ALLMULTI)) { | |
780 | zd_mc_add_all(&hash); | |
781 | } else { | |
782 | DECLARE_MAC_BUF(macbuf); | |
783 | ||
784 | zd_mc_clear(&hash); | |
785 | for (i = 0; i < mc_count; i++) { | |
786 | if (!mclist) | |
787 | break; | |
788 | dev_dbg_f(zd_mac_dev(mac), "mc addr %s\n", | |
789 | print_mac(macbuf, mclist->dmi_addr)); | |
790 | zd_mc_add_addr(&hash, mclist->dmi_addr); | |
791 | mclist = mclist->next; | |
792 | } | |
e85d0918 | 793 | } |
459c51ad DD |
794 | |
795 | spin_lock_irqsave(&mac->lock, flags); | |
796 | mac->pass_failed_fcs = !!(*new_flags & FIF_FCSFAIL); | |
797 | mac->pass_ctrl = !!(*new_flags & FIF_CONTROL); | |
798 | mac->multicast_hash = hash; | |
799 | spin_unlock_irqrestore(&mac->lock, flags); | |
800 | queue_work(zd_workqueue, &mac->set_multicast_hash_work); | |
801 | ||
802 | if (changed_flags & FIF_CONTROL) | |
803 | queue_work(zd_workqueue, &mac->set_rx_filter_work); | |
804 | ||
805 | /* no handling required for FIF_OTHER_BSS as we don't currently | |
806 | * do BSSID filtering */ | |
807 | /* FIXME: in future it would be nice to enable the probe response | |
808 | * filter (so that the driver doesn't see them) until | |
809 | * FIF_BCN_PRBRESP_PROMISC is set. however due to atomicity here, we'd | |
810 | * have to schedule work to enable prbresp reception, which might | |
811 | * happen too late. For now we'll just listen and forward them all the | |
812 | * time. */ | |
e85d0918 DD |
813 | } |
814 | ||
459c51ad | 815 | static void set_rts_cts_work(struct work_struct *work) |
e85d0918 | 816 | { |
459c51ad DD |
817 | struct zd_mac *mac = |
818 | container_of(work, struct zd_mac, set_rts_cts_work); | |
819 | unsigned long flags; | |
820 | unsigned int short_preamble; | |
821 | ||
822 | mutex_lock(&mac->chip.mutex); | |
823 | ||
824 | spin_lock_irqsave(&mac->lock, flags); | |
825 | mac->updating_rts_rate = 0; | |
826 | short_preamble = mac->short_preamble; | |
827 | spin_unlock_irqrestore(&mac->lock, flags); | |
828 | ||
829 | zd_chip_set_rts_cts_rate_locked(&mac->chip, short_preamble); | |
830 | mutex_unlock(&mac->chip.mutex); | |
e85d0918 DD |
831 | } |
832 | ||
459c51ad DD |
833 | static void zd_op_erp_ie_changed(struct ieee80211_hw *hw, u8 changes, |
834 | int cts_protection, int preamble) | |
e85d0918 | 835 | { |
459c51ad DD |
836 | struct zd_mac *mac = zd_hw_mac(hw); |
837 | unsigned long flags; | |
838 | ||
839 | dev_dbg_f(zd_mac_dev(mac), "changes: %x\n", changes); | |
840 | ||
841 | if (changes & IEEE80211_ERP_CHANGE_PREAMBLE) { | |
842 | spin_lock_irqsave(&mac->lock, flags); | |
843 | mac->short_preamble = !preamble; | |
844 | if (!mac->updating_rts_rate) { | |
845 | mac->updating_rts_rate = 1; | |
846 | /* FIXME: should disable TX here, until work has | |
847 | * completed and RTS_CTS reg is updated */ | |
848 | queue_work(zd_workqueue, &mac->set_rts_cts_work); | |
849 | } | |
850 | spin_unlock_irqrestore(&mac->lock, flags); | |
851 | } | |
e85d0918 DD |
852 | } |
853 | ||
459c51ad DD |
854 | static const struct ieee80211_ops zd_ops = { |
855 | .tx = zd_op_tx, | |
856 | .start = zd_op_start, | |
857 | .stop = zd_op_stop, | |
858 | .add_interface = zd_op_add_interface, | |
859 | .remove_interface = zd_op_remove_interface, | |
860 | .config = zd_op_config, | |
861 | .config_interface = zd_op_config_interface, | |
862 | .configure_filter = zd_op_configure_filter, | |
863 | .erp_ie_changed = zd_op_erp_ie_changed, | |
864 | }; | |
865 | ||
866 | struct ieee80211_hw *zd_mac_alloc_hw(struct usb_interface *intf) | |
e85d0918 | 867 | { |
459c51ad DD |
868 | struct zd_mac *mac; |
869 | struct ieee80211_hw *hw; | |
870 | int i; | |
e85d0918 | 871 | |
459c51ad DD |
872 | hw = ieee80211_alloc_hw(sizeof(struct zd_mac), &zd_ops); |
873 | if (!hw) { | |
874 | dev_dbg_f(&intf->dev, "out of memory\n"); | |
875 | return NULL; | |
db888aed | 876 | } |
459c51ad DD |
877 | |
878 | mac = zd_hw_mac(hw); | |
879 | ||
880 | memset(mac, 0, sizeof(*mac)); | |
881 | spin_lock_init(&mac->lock); | |
882 | mac->hw = hw; | |
883 | ||
884 | mac->type = IEEE80211_IF_TYPE_INVALID; | |
885 | ||
886 | memcpy(mac->channels, zd_channels, sizeof(zd_channels)); | |
887 | memcpy(mac->rates, zd_rates, sizeof(zd_rates)); | |
888 | mac->modes[0].mode = MODE_IEEE80211G; | |
889 | mac->modes[0].num_rates = ARRAY_SIZE(zd_rates); | |
890 | mac->modes[0].rates = mac->rates; | |
891 | mac->modes[0].num_channels = ARRAY_SIZE(zd_channels); | |
892 | mac->modes[0].channels = mac->channels; | |
893 | mac->modes[1].mode = MODE_IEEE80211B; | |
894 | mac->modes[1].num_rates = 4; | |
895 | mac->modes[1].rates = mac->rates; | |
896 | mac->modes[1].num_channels = ARRAY_SIZE(zd_channels); | |
897 | mac->modes[1].channels = mac->channels; | |
898 | ||
899 | hw->flags = IEEE80211_HW_RX_INCLUDES_FCS | | |
900 | IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED; | |
901 | hw->max_rssi = 100; | |
902 | hw->max_signal = 100; | |
903 | ||
904 | hw->queues = 1; | |
905 | hw->extra_tx_headroom = sizeof(struct zd_ctrlset); | |
906 | ||
907 | skb_queue_head_init(&mac->ack_wait_queue); | |
908 | ||
909 | for (i = 0; i < 2; i++) { | |
910 | if (ieee80211_register_hwmode(hw, &mac->modes[i])) { | |
911 | dev_dbg_f(&intf->dev, "cannot register hwmode\n"); | |
912 | ieee80211_free_hw(hw); | |
913 | return NULL; | |
914 | } | |
db888aed | 915 | } |
459c51ad DD |
916 | |
917 | zd_chip_init(&mac->chip, hw, intf); | |
918 | housekeeping_init(mac); | |
919 | INIT_WORK(&mac->set_multicast_hash_work, set_multicast_hash_handler); | |
920 | INIT_WORK(&mac->set_rts_cts_work, set_rts_cts_work); | |
921 | INIT_WORK(&mac->set_rx_filter_work, set_rx_filter_handler); | |
922 | ||
923 | SET_IEEE80211_DEV(hw, &intf->dev); | |
924 | return hw; | |
e85d0918 DD |
925 | } |
926 | ||
583afd1e UK |
927 | #define LINK_LED_WORK_DELAY HZ |
928 | ||
c4028958 | 929 | static void link_led_handler(struct work_struct *work) |
583afd1e | 930 | { |
c4028958 DH |
931 | struct zd_mac *mac = |
932 | container_of(work, struct zd_mac, housekeeping.link_led_work.work); | |
583afd1e | 933 | struct zd_chip *chip = &mac->chip; |
583afd1e UK |
934 | int is_associated; |
935 | int r; | |
936 | ||
937 | spin_lock_irq(&mac->lock); | |
459c51ad | 938 | is_associated = mac->associated; |
583afd1e UK |
939 | spin_unlock_irq(&mac->lock); |
940 | ||
941 | r = zd_chip_control_leds(chip, | |
942 | is_associated ? LED_ASSOCIATED : LED_SCANNING); | |
943 | if (r) | |
459c51ad | 944 | dev_dbg_f(zd_mac_dev(mac), "zd_chip_control_leds error %d\n", r); |
583afd1e UK |
945 | |
946 | queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work, | |
947 | LINK_LED_WORK_DELAY); | |
948 | } | |
949 | ||
950 | static void housekeeping_init(struct zd_mac *mac) | |
951 | { | |
c4028958 | 952 | INIT_DELAYED_WORK(&mac->housekeeping.link_led_work, link_led_handler); |
583afd1e UK |
953 | } |
954 | ||
955 | static void housekeeping_enable(struct zd_mac *mac) | |
956 | { | |
957 | dev_dbg_f(zd_mac_dev(mac), "\n"); | |
958 | queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work, | |
959 | 0); | |
960 | } | |
961 | ||
962 | static void housekeeping_disable(struct zd_mac *mac) | |
963 | { | |
964 | dev_dbg_f(zd_mac_dev(mac), "\n"); | |
965 | cancel_rearming_delayed_workqueue(zd_workqueue, | |
966 | &mac->housekeeping.link_led_work); | |
967 | zd_chip_control_leds(&mac->chip, LED_OFF); | |
968 | } |