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brcmfmac: remove unnecessary EXPORT_SYMBOL() usage
[deliverable/linux.git] / drivers / net / wireless / brcm80211 / brcmfmac / fwsignal.c
1 /*
2 * Copyright (c) 2010 Broadcom Corporation
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 ANY
11 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
13 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16 #include <linux/types.h>
17 #include <linux/module.h>
18 #include <linux/if_ether.h>
19 #include <linux/spinlock.h>
20 #include <linux/skbuff.h>
21 #include <linux/netdevice.h>
22 #include <linux/etherdevice.h>
23 #include <linux/err.h>
24 #include <linux/jiffies.h>
25 #include <net/cfg80211.h>
26
27 #include <brcmu_utils.h>
28 #include <brcmu_wifi.h>
29 #include "dhd.h"
30 #include "dhd_dbg.h"
31 #include "dhd_bus.h"
32 #include "fwil.h"
33 #include "fwil_types.h"
34 #include "fweh.h"
35 #include "fwsignal.h"
36 #include "p2p.h"
37 #include "wl_cfg80211.h"
38 #include "proto.h"
39
40 /**
41 * DOC: Firmware Signalling
42 *
43 * Firmware can send signals to host and vice versa, which are passed in the
44 * data packets using TLV based header. This signalling layer is on top of the
45 * BDC bus protocol layer.
46 */
47
48 /*
49 * single definition for firmware-driver flow control tlv's.
50 *
51 * each tlv is specified by BRCMF_FWS_TLV_DEF(name, ID, length).
52 * A length value 0 indicates variable length tlv.
53 */
54 #define BRCMF_FWS_TLV_DEFLIST \
55 BRCMF_FWS_TLV_DEF(MAC_OPEN, 1, 1) \
56 BRCMF_FWS_TLV_DEF(MAC_CLOSE, 2, 1) \
57 BRCMF_FWS_TLV_DEF(MAC_REQUEST_CREDIT, 3, 2) \
58 BRCMF_FWS_TLV_DEF(TXSTATUS, 4, 4) \
59 BRCMF_FWS_TLV_DEF(PKTTAG, 5, 4) \
60 BRCMF_FWS_TLV_DEF(MACDESC_ADD, 6, 8) \
61 BRCMF_FWS_TLV_DEF(MACDESC_DEL, 7, 8) \
62 BRCMF_FWS_TLV_DEF(RSSI, 8, 1) \
63 BRCMF_FWS_TLV_DEF(INTERFACE_OPEN, 9, 1) \
64 BRCMF_FWS_TLV_DEF(INTERFACE_CLOSE, 10, 1) \
65 BRCMF_FWS_TLV_DEF(FIFO_CREDITBACK, 11, 6) \
66 BRCMF_FWS_TLV_DEF(PENDING_TRAFFIC_BMP, 12, 2) \
67 BRCMF_FWS_TLV_DEF(MAC_REQUEST_PACKET, 13, 3) \
68 BRCMF_FWS_TLV_DEF(HOST_REORDER_RXPKTS, 14, 10) \
69 BRCMF_FWS_TLV_DEF(TRANS_ID, 18, 6) \
70 BRCMF_FWS_TLV_DEF(COMP_TXSTATUS, 19, 1) \
71 BRCMF_FWS_TLV_DEF(FILLER, 255, 0)
72
73 /*
74 * enum brcmf_fws_tlv_type - definition of tlv identifiers.
75 */
76 #define BRCMF_FWS_TLV_DEF(name, id, len) \
77 BRCMF_FWS_TYPE_ ## name = id,
78 enum brcmf_fws_tlv_type {
79 BRCMF_FWS_TLV_DEFLIST
80 BRCMF_FWS_TYPE_INVALID
81 };
82 #undef BRCMF_FWS_TLV_DEF
83
84 /*
85 * enum brcmf_fws_tlv_len - definition of tlv lengths.
86 */
87 #define BRCMF_FWS_TLV_DEF(name, id, len) \
88 BRCMF_FWS_TYPE_ ## name ## _LEN = (len),
89 enum brcmf_fws_tlv_len {
90 BRCMF_FWS_TLV_DEFLIST
91 };
92 #undef BRCMF_FWS_TLV_DEF
93
94 #ifdef DEBUG
95 /*
96 * brcmf_fws_tlv_names - array of tlv names.
97 */
98 #define BRCMF_FWS_TLV_DEF(name, id, len) \
99 { id, #name },
100 static struct {
101 enum brcmf_fws_tlv_type id;
102 const char *name;
103 } brcmf_fws_tlv_names[] = {
104 BRCMF_FWS_TLV_DEFLIST
105 };
106 #undef BRCMF_FWS_TLV_DEF
107
108
109 static const char *brcmf_fws_get_tlv_name(enum brcmf_fws_tlv_type id)
110 {
111 int i;
112
113 for (i = 0; i < ARRAY_SIZE(brcmf_fws_tlv_names); i++)
114 if (brcmf_fws_tlv_names[i].id == id)
115 return brcmf_fws_tlv_names[i].name;
116
117 return "INVALID";
118 }
119 #else
120 static const char *brcmf_fws_get_tlv_name(enum brcmf_fws_tlv_type id)
121 {
122 return "NODEBUG";
123 }
124 #endif /* DEBUG */
125
126 /*
127 * The PKTTAG tlv has additional bytes when firmware-signalling
128 * mode has REUSESEQ flag set.
129 */
130 #define BRCMF_FWS_TYPE_SEQ_LEN 2
131
132 /*
133 * flags used to enable tlv signalling from firmware.
134 */
135 #define BRCMF_FWS_FLAGS_RSSI_SIGNALS 0x0001
136 #define BRCMF_FWS_FLAGS_XONXOFF_SIGNALS 0x0002
137 #define BRCMF_FWS_FLAGS_CREDIT_STATUS_SIGNALS 0x0004
138 #define BRCMF_FWS_FLAGS_HOST_PROPTXSTATUS_ACTIVE 0x0008
139 #define BRCMF_FWS_FLAGS_PSQ_GENERATIONFSM_ENABLE 0x0010
140 #define BRCMF_FWS_FLAGS_PSQ_ZERO_BUFFER_ENABLE 0x0020
141 #define BRCMF_FWS_FLAGS_HOST_RXREORDER_ACTIVE 0x0040
142
143 #define BRCMF_FWS_MAC_DESC_TABLE_SIZE 32
144 #define BRCMF_FWS_MAC_DESC_ID_INVALID 0xff
145
146 #define BRCMF_FWS_HOSTIF_FLOWSTATE_OFF 0
147 #define BRCMF_FWS_HOSTIF_FLOWSTATE_ON 1
148 #define BRCMF_FWS_FLOWCONTROL_HIWATER 128
149 #define BRCMF_FWS_FLOWCONTROL_LOWATER 64
150
151 #define BRCMF_FWS_PSQ_PREC_COUNT ((BRCMF_FWS_FIFO_COUNT + 1) * 2)
152 #define BRCMF_FWS_PSQ_LEN 256
153
154 #define BRCMF_FWS_HTOD_FLAG_PKTFROMHOST 0x01
155 #define BRCMF_FWS_HTOD_FLAG_PKT_REQUESTED 0x02
156
157 #define BRCMF_FWS_RET_OK_NOSCHEDULE 0
158 #define BRCMF_FWS_RET_OK_SCHEDULE 1
159
160 #define BRCMF_FWS_MODE_REUSESEQ_SHIFT 3 /* seq reuse */
161 #define BRCMF_FWS_MODE_SET_REUSESEQ(x, val) ((x) = \
162 ((x) & ~(1 << BRCMF_FWS_MODE_REUSESEQ_SHIFT)) | \
163 (((val) & 1) << BRCMF_FWS_MODE_REUSESEQ_SHIFT))
164 #define BRCMF_FWS_MODE_GET_REUSESEQ(x) \
165 (((x) >> BRCMF_FWS_MODE_REUSESEQ_SHIFT) & 1)
166
167 /**
168 * enum brcmf_fws_skb_state - indicates processing state of skb.
169 *
170 * @BRCMF_FWS_SKBSTATE_NEW: sk_buff is newly arrived in the driver.
171 * @BRCMF_FWS_SKBSTATE_DELAYED: sk_buff had to wait on queue.
172 * @BRCMF_FWS_SKBSTATE_SUPPRESSED: sk_buff has been suppressed by firmware.
173 * @BRCMF_FWS_SKBSTATE_TIM: allocated for TIM update info.
174 */
175 enum brcmf_fws_skb_state {
176 BRCMF_FWS_SKBSTATE_NEW,
177 BRCMF_FWS_SKBSTATE_DELAYED,
178 BRCMF_FWS_SKBSTATE_SUPPRESSED,
179 BRCMF_FWS_SKBSTATE_TIM
180 };
181
182 /**
183 * struct brcmf_skbuff_cb - control buffer associated with skbuff.
184 *
185 * @bus_flags: 2 bytes reserved for bus specific parameters
186 * @if_flags: holds interface index and packet related flags.
187 * @htod: host to device packet identifier (used in PKTTAG tlv).
188 * @htod_seq: this 16-bit is original seq number for every suppress packet.
189 * @state: transmit state of the packet.
190 * @mac: descriptor related to destination for this packet.
191 *
192 * This information is stored in control buffer struct sk_buff::cb, which
193 * provides 48 bytes of storage so this structure should not exceed that.
194 */
195 struct brcmf_skbuff_cb {
196 u16 bus_flags;
197 u16 if_flags;
198 u32 htod;
199 u16 htod_seq;
200 enum brcmf_fws_skb_state state;
201 struct brcmf_fws_mac_descriptor *mac;
202 };
203
204 /*
205 * macro casting skbuff control buffer to struct brcmf_skbuff_cb.
206 */
207 #define brcmf_skbcb(skb) ((struct brcmf_skbuff_cb *)((skb)->cb))
208
209 /*
210 * sk_buff control if flags
211 *
212 * b[11] - packet sent upon firmware request.
213 * b[10] - packet only contains signalling data.
214 * b[9] - packet is a tx packet.
215 * b[8] - packet used requested credit
216 * b[7] - interface in AP mode.
217 * b[3:0] - interface index.
218 */
219 #define BRCMF_SKB_IF_FLAGS_REQUESTED_MASK 0x0800
220 #define BRCMF_SKB_IF_FLAGS_REQUESTED_SHIFT 11
221 #define BRCMF_SKB_IF_FLAGS_SIGNAL_ONLY_MASK 0x0400
222 #define BRCMF_SKB_IF_FLAGS_SIGNAL_ONLY_SHIFT 10
223 #define BRCMF_SKB_IF_FLAGS_TRANSMIT_MASK 0x0200
224 #define BRCMF_SKB_IF_FLAGS_TRANSMIT_SHIFT 9
225 #define BRCMF_SKB_IF_FLAGS_REQ_CREDIT_MASK 0x0100
226 #define BRCMF_SKB_IF_FLAGS_REQ_CREDIT_SHIFT 8
227 #define BRCMF_SKB_IF_FLAGS_IF_AP_MASK 0x0080
228 #define BRCMF_SKB_IF_FLAGS_IF_AP_SHIFT 7
229 #define BRCMF_SKB_IF_FLAGS_INDEX_MASK 0x000f
230 #define BRCMF_SKB_IF_FLAGS_INDEX_SHIFT 0
231
232 #define brcmf_skb_if_flags_set_field(skb, field, value) \
233 brcmu_maskset16(&(brcmf_skbcb(skb)->if_flags), \
234 BRCMF_SKB_IF_FLAGS_ ## field ## _MASK, \
235 BRCMF_SKB_IF_FLAGS_ ## field ## _SHIFT, (value))
236 #define brcmf_skb_if_flags_get_field(skb, field) \
237 brcmu_maskget16(brcmf_skbcb(skb)->if_flags, \
238 BRCMF_SKB_IF_FLAGS_ ## field ## _MASK, \
239 BRCMF_SKB_IF_FLAGS_ ## field ## _SHIFT)
240
241 /*
242 * sk_buff control packet identifier
243 *
244 * 32-bit packet identifier used in PKTTAG tlv from host to dongle.
245 *
246 * - Generated at the host (e.g. dhd)
247 * - Seen as a generic sequence number by firmware except for the flags field.
248 *
249 * Generation : b[31] => generation number for this packet [host->fw]
250 * OR, current generation number [fw->host]
251 * Flags : b[30:27] => command, status flags
252 * FIFO-AC : b[26:24] => AC-FIFO id
253 * h-slot : b[23:8] => hanger-slot
254 * freerun : b[7:0] => A free running counter
255 */
256 #define BRCMF_SKB_HTOD_TAG_GENERATION_MASK 0x80000000
257 #define BRCMF_SKB_HTOD_TAG_GENERATION_SHIFT 31
258 #define BRCMF_SKB_HTOD_TAG_FLAGS_MASK 0x78000000
259 #define BRCMF_SKB_HTOD_TAG_FLAGS_SHIFT 27
260 #define BRCMF_SKB_HTOD_TAG_FIFO_MASK 0x07000000
261 #define BRCMF_SKB_HTOD_TAG_FIFO_SHIFT 24
262 #define BRCMF_SKB_HTOD_TAG_HSLOT_MASK 0x00ffff00
263 #define BRCMF_SKB_HTOD_TAG_HSLOT_SHIFT 8
264 #define BRCMF_SKB_HTOD_TAG_FREERUN_MASK 0x000000ff
265 #define BRCMF_SKB_HTOD_TAG_FREERUN_SHIFT 0
266
267 #define brcmf_skb_htod_tag_set_field(skb, field, value) \
268 brcmu_maskset32(&(brcmf_skbcb(skb)->htod), \
269 BRCMF_SKB_HTOD_TAG_ ## field ## _MASK, \
270 BRCMF_SKB_HTOD_TAG_ ## field ## _SHIFT, (value))
271 #define brcmf_skb_htod_tag_get_field(skb, field) \
272 brcmu_maskget32(brcmf_skbcb(skb)->htod, \
273 BRCMF_SKB_HTOD_TAG_ ## field ## _MASK, \
274 BRCMF_SKB_HTOD_TAG_ ## field ## _SHIFT)
275
276 #define BRCMF_SKB_HTOD_SEQ_FROMFW_MASK 0x2000
277 #define BRCMF_SKB_HTOD_SEQ_FROMFW_SHIFT 13
278 #define BRCMF_SKB_HTOD_SEQ_FROMDRV_MASK 0x1000
279 #define BRCMF_SKB_HTOD_SEQ_FROMDRV_SHIFT 12
280 #define BRCMF_SKB_HTOD_SEQ_NR_MASK 0x0fff
281 #define BRCMF_SKB_HTOD_SEQ_NR_SHIFT 0
282
283 #define brcmf_skb_htod_seq_set_field(skb, field, value) \
284 brcmu_maskset16(&(brcmf_skbcb(skb)->htod_seq), \
285 BRCMF_SKB_HTOD_SEQ_ ## field ## _MASK, \
286 BRCMF_SKB_HTOD_SEQ_ ## field ## _SHIFT, (value))
287 #define brcmf_skb_htod_seq_get_field(skb, field) \
288 brcmu_maskget16(brcmf_skbcb(skb)->htod_seq, \
289 BRCMF_SKB_HTOD_SEQ_ ## field ## _MASK, \
290 BRCMF_SKB_HTOD_SEQ_ ## field ## _SHIFT)
291
292 #define BRCMF_FWS_TXSTAT_GENERATION_MASK 0x80000000
293 #define BRCMF_FWS_TXSTAT_GENERATION_SHIFT 31
294 #define BRCMF_FWS_TXSTAT_FLAGS_MASK 0x78000000
295 #define BRCMF_FWS_TXSTAT_FLAGS_SHIFT 27
296 #define BRCMF_FWS_TXSTAT_FIFO_MASK 0x07000000
297 #define BRCMF_FWS_TXSTAT_FIFO_SHIFT 24
298 #define BRCMF_FWS_TXSTAT_HSLOT_MASK 0x00FFFF00
299 #define BRCMF_FWS_TXSTAT_HSLOT_SHIFT 8
300 #define BRCMF_FWS_TXSTAT_FREERUN_MASK 0x000000FF
301 #define BRCMF_FWS_TXSTAT_FREERUN_SHIFT 0
302
303 #define brcmf_txstatus_get_field(txs, field) \
304 brcmu_maskget32(txs, BRCMF_FWS_TXSTAT_ ## field ## _MASK, \
305 BRCMF_FWS_TXSTAT_ ## field ## _SHIFT)
306
307 /* How long to defer borrowing in jiffies */
308 #define BRCMF_FWS_BORROW_DEFER_PERIOD (HZ / 10)
309
310 /**
311 * enum brcmf_fws_fifo - fifo indices used by dongle firmware.
312 *
313 * @BRCMF_FWS_FIFO_FIRST: first fifo, ie. background.
314 * @BRCMF_FWS_FIFO_AC_BK: fifo for background traffic.
315 * @BRCMF_FWS_FIFO_AC_BE: fifo for best-effort traffic.
316 * @BRCMF_FWS_FIFO_AC_VI: fifo for video traffic.
317 * @BRCMF_FWS_FIFO_AC_VO: fifo for voice traffic.
318 * @BRCMF_FWS_FIFO_BCMC: fifo for broadcast/multicast (AP only).
319 * @BRCMF_FWS_FIFO_ATIM: fifo for ATIM (AP only).
320 * @BRCMF_FWS_FIFO_COUNT: number of fifos.
321 */
322 enum brcmf_fws_fifo {
323 BRCMF_FWS_FIFO_FIRST,
324 BRCMF_FWS_FIFO_AC_BK = BRCMF_FWS_FIFO_FIRST,
325 BRCMF_FWS_FIFO_AC_BE,
326 BRCMF_FWS_FIFO_AC_VI,
327 BRCMF_FWS_FIFO_AC_VO,
328 BRCMF_FWS_FIFO_BCMC,
329 BRCMF_FWS_FIFO_ATIM,
330 BRCMF_FWS_FIFO_COUNT
331 };
332
333 /**
334 * enum brcmf_fws_txstatus - txstatus flag values.
335 *
336 * @BRCMF_FWS_TXSTATUS_DISCARD:
337 * host is free to discard the packet.
338 * @BRCMF_FWS_TXSTATUS_CORE_SUPPRESS:
339 * 802.11 core suppressed the packet.
340 * @BRCMF_FWS_TXSTATUS_FW_PS_SUPPRESS:
341 * firmware suppress the packet as device is already in PS mode.
342 * @BRCMF_FWS_TXSTATUS_FW_TOSSED:
343 * firmware tossed the packet.
344 * @BRCMF_FWS_TXSTATUS_HOST_TOSSED:
345 * host tossed the packet.
346 */
347 enum brcmf_fws_txstatus {
348 BRCMF_FWS_TXSTATUS_DISCARD,
349 BRCMF_FWS_TXSTATUS_CORE_SUPPRESS,
350 BRCMF_FWS_TXSTATUS_FW_PS_SUPPRESS,
351 BRCMF_FWS_TXSTATUS_FW_TOSSED,
352 BRCMF_FWS_TXSTATUS_HOST_TOSSED
353 };
354
355 enum brcmf_fws_fcmode {
356 BRCMF_FWS_FCMODE_NONE,
357 BRCMF_FWS_FCMODE_IMPLIED_CREDIT,
358 BRCMF_FWS_FCMODE_EXPLICIT_CREDIT
359 };
360
361 enum brcmf_fws_mac_desc_state {
362 BRCMF_FWS_STATE_OPEN = 1,
363 BRCMF_FWS_STATE_CLOSE
364 };
365
366 /**
367 * struct brcmf_fws_mac_descriptor - firmware signalling data per node/interface
368 *
369 * @occupied: slot is in use.
370 * @mac_handle: handle for mac entry determined by firmware.
371 * @interface_id: interface index.
372 * @state: current state.
373 * @suppressed: mac entry is suppressed.
374 * @generation: generation bit.
375 * @ac_bitmap: ac queue bitmap.
376 * @requested_credit: credits requested by firmware.
377 * @ea: ethernet address.
378 * @seq: per-node free-running sequence.
379 * @psq: power-save queue.
380 * @transit_count: packet in transit to firmware.
381 */
382 struct brcmf_fws_mac_descriptor {
383 char name[16];
384 u8 occupied;
385 u8 mac_handle;
386 u8 interface_id;
387 u8 state;
388 bool suppressed;
389 u8 generation;
390 u8 ac_bitmap;
391 u8 requested_credit;
392 u8 requested_packet;
393 u8 ea[ETH_ALEN];
394 u8 seq[BRCMF_FWS_FIFO_COUNT];
395 struct pktq psq;
396 int transit_count;
397 int suppr_transit_count;
398 bool send_tim_signal;
399 u8 traffic_pending_bmp;
400 u8 traffic_lastreported_bmp;
401 };
402
403 #define BRCMF_FWS_HANGER_MAXITEMS 1024
404
405 /**
406 * enum brcmf_fws_hanger_item_state - state of hanger item.
407 *
408 * @BRCMF_FWS_HANGER_ITEM_STATE_FREE: item is free for use.
409 * @BRCMF_FWS_HANGER_ITEM_STATE_INUSE: item is in use.
410 * @BRCMF_FWS_HANGER_ITEM_STATE_INUSE_SUPPRESSED: item was suppressed.
411 */
412 enum brcmf_fws_hanger_item_state {
413 BRCMF_FWS_HANGER_ITEM_STATE_FREE = 1,
414 BRCMF_FWS_HANGER_ITEM_STATE_INUSE,
415 BRCMF_FWS_HANGER_ITEM_STATE_INUSE_SUPPRESSED
416 };
417
418
419 /**
420 * struct brcmf_fws_hanger_item - single entry for tx pending packet.
421 *
422 * @state: entry is either free or occupied.
423 * @pkt: packet itself.
424 */
425 struct brcmf_fws_hanger_item {
426 enum brcmf_fws_hanger_item_state state;
427 struct sk_buff *pkt;
428 };
429
430 /**
431 * struct brcmf_fws_hanger - holds packets awaiting firmware txstatus.
432 *
433 * @pushed: packets pushed to await txstatus.
434 * @popped: packets popped upon handling txstatus.
435 * @failed_to_push: packets that could not be pushed.
436 * @failed_to_pop: packets that could not be popped.
437 * @failed_slotfind: packets for which failed to find an entry.
438 * @slot_pos: last returned item index for a free entry.
439 * @items: array of hanger items.
440 */
441 struct brcmf_fws_hanger {
442 u32 pushed;
443 u32 popped;
444 u32 failed_to_push;
445 u32 failed_to_pop;
446 u32 failed_slotfind;
447 u32 slot_pos;
448 struct brcmf_fws_hanger_item items[BRCMF_FWS_HANGER_MAXITEMS];
449 };
450
451 struct brcmf_fws_macdesc_table {
452 struct brcmf_fws_mac_descriptor nodes[BRCMF_FWS_MAC_DESC_TABLE_SIZE];
453 struct brcmf_fws_mac_descriptor iface[BRCMF_MAX_IFS];
454 struct brcmf_fws_mac_descriptor other;
455 };
456
457 struct brcmf_fws_info {
458 struct brcmf_pub *drvr;
459 spinlock_t spinlock;
460 ulong flags;
461 struct brcmf_fws_stats stats;
462 struct brcmf_fws_hanger hanger;
463 enum brcmf_fws_fcmode fcmode;
464 bool fw_signals;
465 bool bcmc_credit_check;
466 struct brcmf_fws_macdesc_table desc;
467 struct workqueue_struct *fws_wq;
468 struct work_struct fws_dequeue_work;
469 u32 fifo_enqpkt[BRCMF_FWS_FIFO_COUNT];
470 int fifo_credit[BRCMF_FWS_FIFO_COUNT];
471 int credits_borrowed[BRCMF_FWS_FIFO_AC_VO + 1];
472 int deq_node_pos[BRCMF_FWS_FIFO_COUNT];
473 u32 fifo_credit_map;
474 u32 fifo_delay_map;
475 unsigned long borrow_defer_timestamp;
476 bool bus_flow_blocked;
477 bool creditmap_received;
478 u8 mode;
479 };
480
481 /*
482 * brcmf_fws_prio2fifo - mapping from 802.1d priority to firmware fifo index.
483 */
484 static const int brcmf_fws_prio2fifo[] = {
485 BRCMF_FWS_FIFO_AC_BE,
486 BRCMF_FWS_FIFO_AC_BK,
487 BRCMF_FWS_FIFO_AC_BK,
488 BRCMF_FWS_FIFO_AC_BE,
489 BRCMF_FWS_FIFO_AC_VI,
490 BRCMF_FWS_FIFO_AC_VI,
491 BRCMF_FWS_FIFO_AC_VO,
492 BRCMF_FWS_FIFO_AC_VO
493 };
494
495 static int fcmode;
496 module_param(fcmode, int, S_IRUSR);
497 MODULE_PARM_DESC(fcmode, "mode of firmware signalled flow control");
498
499 #define BRCMF_FWS_TLV_DEF(name, id, len) \
500 case BRCMF_FWS_TYPE_ ## name: \
501 return len;
502
503 /**
504 * brcmf_fws_get_tlv_len() - returns defined length for given tlv id.
505 *
506 * @fws: firmware-signalling information.
507 * @id: identifier of the TLV.
508 *
509 * Return: the specified length for the given TLV; Otherwise -EINVAL.
510 */
511 static int brcmf_fws_get_tlv_len(struct brcmf_fws_info *fws,
512 enum brcmf_fws_tlv_type id)
513 {
514 switch (id) {
515 BRCMF_FWS_TLV_DEFLIST
516 default:
517 fws->stats.tlv_invalid_type++;
518 break;
519 }
520 return -EINVAL;
521 }
522 #undef BRCMF_FWS_TLV_DEF
523
524 static void brcmf_fws_lock(struct brcmf_fws_info *fws)
525 __acquires(&fws->spinlock)
526 {
527 spin_lock_irqsave(&fws->spinlock, fws->flags);
528 }
529
530 static void brcmf_fws_unlock(struct brcmf_fws_info *fws)
531 __releases(&fws->spinlock)
532 {
533 spin_unlock_irqrestore(&fws->spinlock, fws->flags);
534 }
535
536 static bool brcmf_fws_ifidx_match(struct sk_buff *skb, void *arg)
537 {
538 u32 ifidx = brcmf_skb_if_flags_get_field(skb, INDEX);
539 return ifidx == *(int *)arg;
540 }
541
542 static void brcmf_fws_psq_flush(struct brcmf_fws_info *fws, struct pktq *q,
543 int ifidx)
544 {
545 bool (*matchfn)(struct sk_buff *, void *) = NULL;
546 struct sk_buff *skb;
547 int prec;
548
549 if (ifidx != -1)
550 matchfn = brcmf_fws_ifidx_match;
551 for (prec = 0; prec < q->num_prec; prec++) {
552 skb = brcmu_pktq_pdeq_match(q, prec, matchfn, &ifidx);
553 while (skb) {
554 brcmu_pkt_buf_free_skb(skb);
555 skb = brcmu_pktq_pdeq_match(q, prec, matchfn, &ifidx);
556 }
557 }
558 }
559
560 static void brcmf_fws_hanger_init(struct brcmf_fws_hanger *hanger)
561 {
562 int i;
563
564 memset(hanger, 0, sizeof(*hanger));
565 for (i = 0; i < ARRAY_SIZE(hanger->items); i++)
566 hanger->items[i].state = BRCMF_FWS_HANGER_ITEM_STATE_FREE;
567 }
568
569 static u32 brcmf_fws_hanger_get_free_slot(struct brcmf_fws_hanger *h)
570 {
571 u32 i;
572
573 i = (h->slot_pos + 1) % BRCMF_FWS_HANGER_MAXITEMS;
574
575 while (i != h->slot_pos) {
576 if (h->items[i].state == BRCMF_FWS_HANGER_ITEM_STATE_FREE) {
577 h->slot_pos = i;
578 goto done;
579 }
580 i++;
581 if (i == BRCMF_FWS_HANGER_MAXITEMS)
582 i = 0;
583 }
584 brcmf_err("all slots occupied\n");
585 h->failed_slotfind++;
586 i = BRCMF_FWS_HANGER_MAXITEMS;
587 done:
588 return i;
589 }
590
591 static int brcmf_fws_hanger_pushpkt(struct brcmf_fws_hanger *h,
592 struct sk_buff *pkt, u32 slot_id)
593 {
594 if (slot_id >= BRCMF_FWS_HANGER_MAXITEMS)
595 return -ENOENT;
596
597 if (h->items[slot_id].state != BRCMF_FWS_HANGER_ITEM_STATE_FREE) {
598 brcmf_err("slot is not free\n");
599 h->failed_to_push++;
600 return -EINVAL;
601 }
602
603 h->items[slot_id].state = BRCMF_FWS_HANGER_ITEM_STATE_INUSE;
604 h->items[slot_id].pkt = pkt;
605 h->pushed++;
606 return 0;
607 }
608
609 static int brcmf_fws_hanger_poppkt(struct brcmf_fws_hanger *h,
610 u32 slot_id, struct sk_buff **pktout,
611 bool remove_item)
612 {
613 if (slot_id >= BRCMF_FWS_HANGER_MAXITEMS)
614 return -ENOENT;
615
616 if (h->items[slot_id].state == BRCMF_FWS_HANGER_ITEM_STATE_FREE) {
617 brcmf_err("entry not in use\n");
618 h->failed_to_pop++;
619 return -EINVAL;
620 }
621
622 *pktout = h->items[slot_id].pkt;
623 if (remove_item) {
624 h->items[slot_id].state = BRCMF_FWS_HANGER_ITEM_STATE_FREE;
625 h->items[slot_id].pkt = NULL;
626 h->popped++;
627 }
628 return 0;
629 }
630
631 static int brcmf_fws_hanger_mark_suppressed(struct brcmf_fws_hanger *h,
632 u32 slot_id)
633 {
634 if (slot_id >= BRCMF_FWS_HANGER_MAXITEMS)
635 return -ENOENT;
636
637 if (h->items[slot_id].state == BRCMF_FWS_HANGER_ITEM_STATE_FREE) {
638 brcmf_err("entry not in use\n");
639 return -EINVAL;
640 }
641
642 h->items[slot_id].state = BRCMF_FWS_HANGER_ITEM_STATE_INUSE_SUPPRESSED;
643 return 0;
644 }
645
646 static void brcmf_fws_hanger_cleanup(struct brcmf_fws_info *fws,
647 bool (*fn)(struct sk_buff *, void *),
648 int ifidx)
649 {
650 struct brcmf_fws_hanger *h = &fws->hanger;
651 struct sk_buff *skb;
652 int i;
653 enum brcmf_fws_hanger_item_state s;
654
655 for (i = 0; i < ARRAY_SIZE(h->items); i++) {
656 s = h->items[i].state;
657 if (s == BRCMF_FWS_HANGER_ITEM_STATE_INUSE ||
658 s == BRCMF_FWS_HANGER_ITEM_STATE_INUSE_SUPPRESSED) {
659 skb = h->items[i].pkt;
660 if (fn == NULL || fn(skb, &ifidx)) {
661 /* suppress packets freed from psq */
662 if (s == BRCMF_FWS_HANGER_ITEM_STATE_INUSE)
663 brcmu_pkt_buf_free_skb(skb);
664 h->items[i].state =
665 BRCMF_FWS_HANGER_ITEM_STATE_FREE;
666 }
667 }
668 }
669 }
670
671 static void brcmf_fws_macdesc_set_name(struct brcmf_fws_info *fws,
672 struct brcmf_fws_mac_descriptor *desc)
673 {
674 if (desc == &fws->desc.other)
675 strlcpy(desc->name, "MAC-OTHER", sizeof(desc->name));
676 else if (desc->mac_handle)
677 scnprintf(desc->name, sizeof(desc->name), "MAC-%d:%d",
678 desc->mac_handle, desc->interface_id);
679 else
680 scnprintf(desc->name, sizeof(desc->name), "MACIF:%d",
681 desc->interface_id);
682 }
683
684 static void brcmf_fws_macdesc_init(struct brcmf_fws_mac_descriptor *desc,
685 u8 *addr, u8 ifidx)
686 {
687 brcmf_dbg(TRACE,
688 "enter: desc %p ea=%pM, ifidx=%u\n", desc, addr, ifidx);
689 desc->occupied = 1;
690 desc->state = BRCMF_FWS_STATE_OPEN;
691 desc->requested_credit = 0;
692 desc->requested_packet = 0;
693 /* depending on use may need ifp->bssidx instead */
694 desc->interface_id = ifidx;
695 desc->ac_bitmap = 0xff; /* update this when handling APSD */
696 if (addr)
697 memcpy(&desc->ea[0], addr, ETH_ALEN);
698 }
699
700 static
701 void brcmf_fws_macdesc_deinit(struct brcmf_fws_mac_descriptor *desc)
702 {
703 brcmf_dbg(TRACE,
704 "enter: ea=%pM, ifidx=%u\n", desc->ea, desc->interface_id);
705 desc->occupied = 0;
706 desc->state = BRCMF_FWS_STATE_CLOSE;
707 desc->requested_credit = 0;
708 desc->requested_packet = 0;
709 }
710
711 static struct brcmf_fws_mac_descriptor *
712 brcmf_fws_macdesc_lookup(struct brcmf_fws_info *fws, u8 *ea)
713 {
714 struct brcmf_fws_mac_descriptor *entry;
715 int i;
716
717 if (ea == NULL)
718 return ERR_PTR(-EINVAL);
719
720 entry = &fws->desc.nodes[0];
721 for (i = 0; i < ARRAY_SIZE(fws->desc.nodes); i++) {
722 if (entry->occupied && !memcmp(entry->ea, ea, ETH_ALEN))
723 return entry;
724 entry++;
725 }
726
727 return ERR_PTR(-ENOENT);
728 }
729
730 static struct brcmf_fws_mac_descriptor*
731 brcmf_fws_macdesc_find(struct brcmf_fws_info *fws, struct brcmf_if *ifp, u8 *da)
732 {
733 struct brcmf_fws_mac_descriptor *entry = &fws->desc.other;
734 bool multicast;
735
736 multicast = is_multicast_ether_addr(da);
737
738 /* Multicast destination, STA and P2P clients get the interface entry.
739 * STA/GC gets the Mac Entry for TDLS destinations, TDLS destinations
740 * have their own entry.
741 */
742 if (multicast && ifp->fws_desc) {
743 entry = ifp->fws_desc;
744 goto done;
745 }
746
747 entry = brcmf_fws_macdesc_lookup(fws, da);
748 if (IS_ERR(entry))
749 entry = ifp->fws_desc;
750
751 done:
752 return entry;
753 }
754
755 static bool brcmf_fws_macdesc_closed(struct brcmf_fws_info *fws,
756 struct brcmf_fws_mac_descriptor *entry,
757 int fifo)
758 {
759 struct brcmf_fws_mac_descriptor *if_entry;
760 bool closed;
761
762 /* for unique destination entries the related interface
763 * may be closed.
764 */
765 if (entry->mac_handle) {
766 if_entry = &fws->desc.iface[entry->interface_id];
767 if (if_entry->state == BRCMF_FWS_STATE_CLOSE)
768 return true;
769 }
770 /* an entry is closed when the state is closed and
771 * the firmware did not request anything.
772 */
773 closed = entry->state == BRCMF_FWS_STATE_CLOSE &&
774 !entry->requested_credit && !entry->requested_packet;
775
776 /* Or firmware does not allow traffic for given fifo */
777 return closed || !(entry->ac_bitmap & BIT(fifo));
778 }
779
780 static void brcmf_fws_macdesc_cleanup(struct brcmf_fws_info *fws,
781 struct brcmf_fws_mac_descriptor *entry,
782 int ifidx)
783 {
784 if (entry->occupied && (ifidx == -1 || ifidx == entry->interface_id)) {
785 brcmf_fws_psq_flush(fws, &entry->psq, ifidx);
786 entry->occupied = !!(entry->psq.len);
787 }
788 }
789
790 static void brcmf_fws_bus_txq_cleanup(struct brcmf_fws_info *fws,
791 bool (*fn)(struct sk_buff *, void *),
792 int ifidx)
793 {
794 struct brcmf_fws_hanger_item *hi;
795 struct pktq *txq;
796 struct sk_buff *skb;
797 int prec;
798 u32 hslot;
799
800 txq = brcmf_bus_gettxq(fws->drvr->bus_if);
801 if (IS_ERR(txq)) {
802 brcmf_dbg(TRACE, "no txq to clean up\n");
803 return;
804 }
805
806 for (prec = 0; prec < txq->num_prec; prec++) {
807 skb = brcmu_pktq_pdeq_match(txq, prec, fn, &ifidx);
808 while (skb) {
809 hslot = brcmf_skb_htod_tag_get_field(skb, HSLOT);
810 hi = &fws->hanger.items[hslot];
811 WARN_ON(skb != hi->pkt);
812 hi->state = BRCMF_FWS_HANGER_ITEM_STATE_FREE;
813 brcmu_pkt_buf_free_skb(skb);
814 skb = brcmu_pktq_pdeq_match(txq, prec, fn, &ifidx);
815 }
816 }
817 }
818
819 static void brcmf_fws_cleanup(struct brcmf_fws_info *fws, int ifidx)
820 {
821 int i;
822 struct brcmf_fws_mac_descriptor *table;
823 bool (*matchfn)(struct sk_buff *, void *) = NULL;
824
825 if (fws == NULL)
826 return;
827
828 if (ifidx != -1)
829 matchfn = brcmf_fws_ifidx_match;
830
831 /* cleanup individual nodes */
832 table = &fws->desc.nodes[0];
833 for (i = 0; i < ARRAY_SIZE(fws->desc.nodes); i++)
834 brcmf_fws_macdesc_cleanup(fws, &table[i], ifidx);
835
836 brcmf_fws_macdesc_cleanup(fws, &fws->desc.other, ifidx);
837 brcmf_fws_bus_txq_cleanup(fws, matchfn, ifidx);
838 brcmf_fws_hanger_cleanup(fws, matchfn, ifidx);
839 }
840
841 static int brcmf_fws_hdrpush(struct brcmf_fws_info *fws, struct sk_buff *skb)
842 {
843 struct brcmf_fws_mac_descriptor *entry = brcmf_skbcb(skb)->mac;
844 u8 *wlh;
845 u16 data_offset = 0;
846 u8 fillers;
847 __le32 pkttag = cpu_to_le32(brcmf_skbcb(skb)->htod);
848 __le16 pktseq = cpu_to_le16(brcmf_skbcb(skb)->htod_seq);
849
850 brcmf_dbg(TRACE, "enter: %s, idx=%d hslot=%d htod %X seq %X\n",
851 entry->name, brcmf_skb_if_flags_get_field(skb, INDEX),
852 (le32_to_cpu(pkttag) >> 8) & 0xffff,
853 brcmf_skbcb(skb)->htod, brcmf_skbcb(skb)->htod_seq);
854 if (entry->send_tim_signal)
855 data_offset += 2 + BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP_LEN;
856 if (BRCMF_FWS_MODE_GET_REUSESEQ(fws->mode))
857 data_offset += BRCMF_FWS_TYPE_SEQ_LEN;
858 /* +2 is for Type[1] and Len[1] in TLV, plus TIM signal */
859 data_offset += 2 + BRCMF_FWS_TYPE_PKTTAG_LEN;
860 fillers = round_up(data_offset, 4) - data_offset;
861 data_offset += fillers;
862
863 skb_push(skb, data_offset);
864 wlh = skb->data;
865
866 wlh[0] = BRCMF_FWS_TYPE_PKTTAG;
867 wlh[1] = BRCMF_FWS_TYPE_PKTTAG_LEN;
868 memcpy(&wlh[2], &pkttag, sizeof(pkttag));
869 if (BRCMF_FWS_MODE_GET_REUSESEQ(fws->mode)) {
870 wlh[1] += BRCMF_FWS_TYPE_SEQ_LEN;
871 memcpy(&wlh[2 + BRCMF_FWS_TYPE_PKTTAG_LEN], &pktseq,
872 sizeof(pktseq));
873 }
874 wlh += wlh[1] + 2;
875
876 if (entry->send_tim_signal) {
877 entry->send_tim_signal = 0;
878 wlh[0] = BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP;
879 wlh[1] = BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP_LEN;
880 wlh[2] = entry->mac_handle;
881 wlh[3] = entry->traffic_pending_bmp;
882 brcmf_dbg(TRACE, "adding TIM info: handle %d bmp 0x%X\n",
883 entry->mac_handle, entry->traffic_pending_bmp);
884 wlh += BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP_LEN + 2;
885 entry->traffic_lastreported_bmp = entry->traffic_pending_bmp;
886 }
887 if (fillers)
888 memset(wlh, BRCMF_FWS_TYPE_FILLER, fillers);
889
890 brcmf_proto_hdrpush(fws->drvr, brcmf_skb_if_flags_get_field(skb, INDEX),
891 data_offset >> 2, skb);
892 return 0;
893 }
894
895 static bool brcmf_fws_tim_update(struct brcmf_fws_info *fws,
896 struct brcmf_fws_mac_descriptor *entry,
897 int fifo, bool send_immediately)
898 {
899 struct sk_buff *skb;
900 struct brcmf_bus *bus;
901 struct brcmf_skbuff_cb *skcb;
902 s32 err;
903 u32 len;
904
905 /* check delayedQ and suppressQ in one call using bitmap */
906 if (brcmu_pktq_mlen(&entry->psq, 3 << (fifo * 2)) == 0)
907 entry->traffic_pending_bmp &= ~NBITVAL(fifo);
908 else
909 entry->traffic_pending_bmp |= NBITVAL(fifo);
910
911 entry->send_tim_signal = false;
912 if (entry->traffic_lastreported_bmp != entry->traffic_pending_bmp)
913 entry->send_tim_signal = true;
914 if (send_immediately && entry->send_tim_signal &&
915 entry->state == BRCMF_FWS_STATE_CLOSE) {
916 /* create a dummy packet and sent that. The traffic */
917 /* bitmap info will automatically be attached to that packet */
918 len = BRCMF_FWS_TYPE_PKTTAG_LEN + 2 +
919 BRCMF_FWS_TYPE_SEQ_LEN +
920 BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP_LEN + 2 +
921 4 + fws->drvr->hdrlen;
922 skb = brcmu_pkt_buf_get_skb(len);
923 if (skb == NULL)
924 return false;
925 skb_pull(skb, len);
926 skcb = brcmf_skbcb(skb);
927 skcb->mac = entry;
928 skcb->state = BRCMF_FWS_SKBSTATE_TIM;
929 skcb->htod = 0;
930 skcb->htod_seq = 0;
931 bus = fws->drvr->bus_if;
932 err = brcmf_fws_hdrpush(fws, skb);
933 if (err == 0) {
934 brcmf_fws_unlock(fws);
935 err = brcmf_bus_txdata(bus, skb);
936 brcmf_fws_lock(fws);
937 }
938 if (err)
939 brcmu_pkt_buf_free_skb(skb);
940 return true;
941 }
942 return false;
943 }
944
945 static void
946 brcmf_fws_flow_control_check(struct brcmf_fws_info *fws, struct pktq *pq,
947 u8 if_id)
948 {
949 struct brcmf_if *ifp = fws->drvr->iflist[!if_id ? 0 : if_id + 1];
950
951 if (WARN_ON(!ifp))
952 return;
953
954 if ((ifp->netif_stop & BRCMF_NETIF_STOP_REASON_FWS_FC) &&
955 pq->len <= BRCMF_FWS_FLOWCONTROL_LOWATER)
956 brcmf_txflowblock_if(ifp,
957 BRCMF_NETIF_STOP_REASON_FWS_FC, false);
958 if (!(ifp->netif_stop & BRCMF_NETIF_STOP_REASON_FWS_FC) &&
959 pq->len >= BRCMF_FWS_FLOWCONTROL_HIWATER) {
960 fws->stats.fws_flow_block++;
961 brcmf_txflowblock_if(ifp, BRCMF_NETIF_STOP_REASON_FWS_FC, true);
962 }
963 return;
964 }
965
966 static int brcmf_fws_rssi_indicate(struct brcmf_fws_info *fws, s8 rssi)
967 {
968 brcmf_dbg(CTL, "rssi %d\n", rssi);
969 return 0;
970 }
971
972 static
973 int brcmf_fws_macdesc_indicate(struct brcmf_fws_info *fws, u8 type, u8 *data)
974 {
975 struct brcmf_fws_mac_descriptor *entry, *existing;
976 u8 mac_handle;
977 u8 ifidx;
978 u8 *addr;
979
980 mac_handle = *data++;
981 ifidx = *data++;
982 addr = data;
983
984 entry = &fws->desc.nodes[mac_handle & 0x1F];
985 if (type == BRCMF_FWS_TYPE_MACDESC_DEL) {
986 if (entry->occupied) {
987 brcmf_dbg(TRACE, "deleting %s mac %pM\n",
988 entry->name, addr);
989 brcmf_fws_lock(fws);
990 brcmf_fws_macdesc_cleanup(fws, entry, -1);
991 brcmf_fws_macdesc_deinit(entry);
992 brcmf_fws_unlock(fws);
993 } else
994 fws->stats.mac_update_failed++;
995 return 0;
996 }
997
998 existing = brcmf_fws_macdesc_lookup(fws, addr);
999 if (IS_ERR(existing)) {
1000 if (!entry->occupied) {
1001 brcmf_fws_lock(fws);
1002 entry->mac_handle = mac_handle;
1003 brcmf_fws_macdesc_init(entry, addr, ifidx);
1004 brcmf_fws_macdesc_set_name(fws, entry);
1005 brcmu_pktq_init(&entry->psq, BRCMF_FWS_PSQ_PREC_COUNT,
1006 BRCMF_FWS_PSQ_LEN);
1007 brcmf_fws_unlock(fws);
1008 brcmf_dbg(TRACE, "add %s mac %pM\n", entry->name, addr);
1009 } else {
1010 fws->stats.mac_update_failed++;
1011 }
1012 } else {
1013 if (entry != existing) {
1014 brcmf_dbg(TRACE, "copy mac %s\n", existing->name);
1015 brcmf_fws_lock(fws);
1016 memcpy(entry, existing,
1017 offsetof(struct brcmf_fws_mac_descriptor, psq));
1018 entry->mac_handle = mac_handle;
1019 brcmf_fws_macdesc_deinit(existing);
1020 brcmf_fws_macdesc_set_name(fws, entry);
1021 brcmf_fws_unlock(fws);
1022 brcmf_dbg(TRACE, "relocate %s mac %pM\n", entry->name,
1023 addr);
1024 } else {
1025 brcmf_dbg(TRACE, "use existing\n");
1026 WARN_ON(entry->mac_handle != mac_handle);
1027 /* TODO: what should we do here: continue, reinit, .. */
1028 }
1029 }
1030 return 0;
1031 }
1032
1033 static int brcmf_fws_macdesc_state_indicate(struct brcmf_fws_info *fws,
1034 u8 type, u8 *data)
1035 {
1036 struct brcmf_fws_mac_descriptor *entry;
1037 u8 mac_handle;
1038 int ret;
1039
1040 mac_handle = data[0];
1041 entry = &fws->desc.nodes[mac_handle & 0x1F];
1042 if (!entry->occupied) {
1043 fws->stats.mac_ps_update_failed++;
1044 return -ESRCH;
1045 }
1046 brcmf_fws_lock(fws);
1047 /* a state update should wipe old credits */
1048 entry->requested_credit = 0;
1049 entry->requested_packet = 0;
1050 if (type == BRCMF_FWS_TYPE_MAC_OPEN) {
1051 entry->state = BRCMF_FWS_STATE_OPEN;
1052 ret = BRCMF_FWS_RET_OK_SCHEDULE;
1053 } else {
1054 entry->state = BRCMF_FWS_STATE_CLOSE;
1055 brcmf_fws_tim_update(fws, entry, BRCMF_FWS_FIFO_AC_BK, false);
1056 brcmf_fws_tim_update(fws, entry, BRCMF_FWS_FIFO_AC_BE, false);
1057 brcmf_fws_tim_update(fws, entry, BRCMF_FWS_FIFO_AC_VI, false);
1058 brcmf_fws_tim_update(fws, entry, BRCMF_FWS_FIFO_AC_VO, true);
1059 ret = BRCMF_FWS_RET_OK_NOSCHEDULE;
1060 }
1061 brcmf_fws_unlock(fws);
1062 return ret;
1063 }
1064
1065 static int brcmf_fws_interface_state_indicate(struct brcmf_fws_info *fws,
1066 u8 type, u8 *data)
1067 {
1068 struct brcmf_fws_mac_descriptor *entry;
1069 u8 ifidx;
1070 int ret;
1071
1072 ifidx = data[0];
1073
1074 if (ifidx >= BRCMF_MAX_IFS) {
1075 ret = -ERANGE;
1076 goto fail;
1077 }
1078
1079 entry = &fws->desc.iface[ifidx];
1080 if (!entry->occupied) {
1081 ret = -ESRCH;
1082 goto fail;
1083 }
1084
1085 brcmf_dbg(TRACE, "%s (%d): %s\n", brcmf_fws_get_tlv_name(type), type,
1086 entry->name);
1087 brcmf_fws_lock(fws);
1088 switch (type) {
1089 case BRCMF_FWS_TYPE_INTERFACE_OPEN:
1090 entry->state = BRCMF_FWS_STATE_OPEN;
1091 ret = BRCMF_FWS_RET_OK_SCHEDULE;
1092 break;
1093 case BRCMF_FWS_TYPE_INTERFACE_CLOSE:
1094 entry->state = BRCMF_FWS_STATE_CLOSE;
1095 ret = BRCMF_FWS_RET_OK_NOSCHEDULE;
1096 break;
1097 default:
1098 ret = -EINVAL;
1099 brcmf_fws_unlock(fws);
1100 goto fail;
1101 }
1102 brcmf_fws_unlock(fws);
1103 return ret;
1104
1105 fail:
1106 fws->stats.if_update_failed++;
1107 return ret;
1108 }
1109
1110 static int brcmf_fws_request_indicate(struct brcmf_fws_info *fws, u8 type,
1111 u8 *data)
1112 {
1113 struct brcmf_fws_mac_descriptor *entry;
1114
1115 entry = &fws->desc.nodes[data[1] & 0x1F];
1116 if (!entry->occupied) {
1117 if (type == BRCMF_FWS_TYPE_MAC_REQUEST_CREDIT)
1118 fws->stats.credit_request_failed++;
1119 else
1120 fws->stats.packet_request_failed++;
1121 return -ESRCH;
1122 }
1123
1124 brcmf_dbg(TRACE, "%s (%d): %s cnt %d bmp %d\n",
1125 brcmf_fws_get_tlv_name(type), type, entry->name,
1126 data[0], data[2]);
1127 brcmf_fws_lock(fws);
1128 if (type == BRCMF_FWS_TYPE_MAC_REQUEST_CREDIT)
1129 entry->requested_credit = data[0];
1130 else
1131 entry->requested_packet = data[0];
1132
1133 entry->ac_bitmap = data[2];
1134 brcmf_fws_unlock(fws);
1135 return BRCMF_FWS_RET_OK_SCHEDULE;
1136 }
1137
1138 static void
1139 brcmf_fws_macdesc_use_req_credit(struct brcmf_fws_mac_descriptor *entry,
1140 struct sk_buff *skb)
1141 {
1142 if (entry->requested_credit > 0) {
1143 entry->requested_credit--;
1144 brcmf_skb_if_flags_set_field(skb, REQUESTED, 1);
1145 brcmf_skb_if_flags_set_field(skb, REQ_CREDIT, 1);
1146 if (entry->state != BRCMF_FWS_STATE_CLOSE)
1147 brcmf_err("requested credit set while mac not closed!\n");
1148 } else if (entry->requested_packet > 0) {
1149 entry->requested_packet--;
1150 brcmf_skb_if_flags_set_field(skb, REQUESTED, 1);
1151 brcmf_skb_if_flags_set_field(skb, REQ_CREDIT, 0);
1152 if (entry->state != BRCMF_FWS_STATE_CLOSE)
1153 brcmf_err("requested packet set while mac not closed!\n");
1154 } else {
1155 brcmf_skb_if_flags_set_field(skb, REQUESTED, 0);
1156 brcmf_skb_if_flags_set_field(skb, REQ_CREDIT, 0);
1157 }
1158 }
1159
1160 static void brcmf_fws_macdesc_return_req_credit(struct sk_buff *skb)
1161 {
1162 struct brcmf_fws_mac_descriptor *entry = brcmf_skbcb(skb)->mac;
1163
1164 if ((brcmf_skb_if_flags_get_field(skb, REQ_CREDIT)) &&
1165 (entry->state == BRCMF_FWS_STATE_CLOSE))
1166 entry->requested_credit++;
1167 }
1168
1169 static void brcmf_fws_return_credits(struct brcmf_fws_info *fws,
1170 u8 fifo, u8 credits)
1171 {
1172 int lender_ac;
1173 int *borrowed;
1174 int *fifo_credit;
1175
1176 if (!credits)
1177 return;
1178
1179 fws->fifo_credit_map |= 1 << fifo;
1180
1181 if ((fifo == BRCMF_FWS_FIFO_AC_BE) &&
1182 (fws->credits_borrowed[0])) {
1183 for (lender_ac = BRCMF_FWS_FIFO_AC_VO; lender_ac >= 0;
1184 lender_ac--) {
1185 borrowed = &fws->credits_borrowed[lender_ac];
1186 if (*borrowed) {
1187 fws->fifo_credit_map |= (1 << lender_ac);
1188 fifo_credit = &fws->fifo_credit[lender_ac];
1189 if (*borrowed >= credits) {
1190 *borrowed -= credits;
1191 *fifo_credit += credits;
1192 return;
1193 } else {
1194 credits -= *borrowed;
1195 *fifo_credit += *borrowed;
1196 *borrowed = 0;
1197 }
1198 }
1199 }
1200 }
1201
1202 fws->fifo_credit[fifo] += credits;
1203 }
1204
1205 static void brcmf_fws_schedule_deq(struct brcmf_fws_info *fws)
1206 {
1207 /* only schedule dequeue when there are credits for delayed traffic */
1208 if ((fws->fifo_credit_map & fws->fifo_delay_map) ||
1209 (!brcmf_fws_fc_active(fws) && fws->fifo_delay_map))
1210 queue_work(fws->fws_wq, &fws->fws_dequeue_work);
1211 }
1212
1213 static int brcmf_fws_enq(struct brcmf_fws_info *fws,
1214 enum brcmf_fws_skb_state state, int fifo,
1215 struct sk_buff *p)
1216 {
1217 int prec = 2 * fifo;
1218 u32 *qfull_stat = &fws->stats.delayq_full_error;
1219 struct brcmf_fws_mac_descriptor *entry;
1220 struct pktq *pq;
1221 struct sk_buff_head *queue;
1222 struct sk_buff *p_head;
1223 struct sk_buff *p_tail;
1224 u32 fr_new;
1225 u32 fr_compare;
1226
1227 entry = brcmf_skbcb(p)->mac;
1228 if (entry == NULL) {
1229 brcmf_err("no mac descriptor found for skb %p\n", p);
1230 return -ENOENT;
1231 }
1232
1233 brcmf_dbg(DATA, "enter: fifo %d skb %p\n", fifo, p);
1234 if (state == BRCMF_FWS_SKBSTATE_SUPPRESSED) {
1235 prec += 1;
1236 qfull_stat = &fws->stats.supprq_full_error;
1237
1238 /* Fix out of order delivery of frames. Dont assume frame */
1239 /* can be inserted at the end, but look for correct position */
1240 pq = &entry->psq;
1241 if (pktq_full(pq) || pktq_pfull(pq, prec)) {
1242 *qfull_stat += 1;
1243 return -ENFILE;
1244 }
1245 queue = &pq->q[prec].skblist;
1246
1247 p_head = skb_peek(queue);
1248 p_tail = skb_peek_tail(queue);
1249 fr_new = brcmf_skb_htod_tag_get_field(p, FREERUN);
1250
1251 while (p_head != p_tail) {
1252 fr_compare = brcmf_skb_htod_tag_get_field(p_tail,
1253 FREERUN);
1254 /* be sure to handle wrap of 256 */
1255 if (((fr_new > fr_compare) &&
1256 ((fr_new - fr_compare) < 128)) ||
1257 ((fr_new < fr_compare) &&
1258 ((fr_compare - fr_new) > 128)))
1259 break;
1260 p_tail = skb_queue_prev(queue, p_tail);
1261 }
1262 /* Position found. Determine what to do */
1263 if (p_tail == NULL) {
1264 /* empty list */
1265 __skb_queue_tail(queue, p);
1266 } else {
1267 fr_compare = brcmf_skb_htod_tag_get_field(p_tail,
1268 FREERUN);
1269 if (((fr_new > fr_compare) &&
1270 ((fr_new - fr_compare) < 128)) ||
1271 ((fr_new < fr_compare) &&
1272 ((fr_compare - fr_new) > 128))) {
1273 /* After tail */
1274 __skb_queue_after(queue, p_tail, p);
1275 } else {
1276 /* Before tail */
1277 __skb_insert(p, p_tail->prev, p_tail, queue);
1278 }
1279 }
1280
1281 /* Complete the counters and statistics */
1282 pq->len++;
1283 if (pq->hi_prec < prec)
1284 pq->hi_prec = (u8) prec;
1285 } else if (brcmu_pktq_penq(&entry->psq, prec, p) == NULL) {
1286 *qfull_stat += 1;
1287 return -ENFILE;
1288 }
1289
1290 /* increment total enqueued packet count */
1291 fws->fifo_delay_map |= 1 << fifo;
1292 fws->fifo_enqpkt[fifo]++;
1293
1294 /* update the sk_buff state */
1295 brcmf_skbcb(p)->state = state;
1296
1297 /*
1298 * A packet has been pushed so update traffic
1299 * availability bitmap, if applicable
1300 */
1301 brcmf_fws_tim_update(fws, entry, fifo, true);
1302 brcmf_fws_flow_control_check(fws, &entry->psq,
1303 brcmf_skb_if_flags_get_field(p, INDEX));
1304 return 0;
1305 }
1306
1307 static struct sk_buff *brcmf_fws_deq(struct brcmf_fws_info *fws, int fifo)
1308 {
1309 struct brcmf_fws_mac_descriptor *table;
1310 struct brcmf_fws_mac_descriptor *entry;
1311 struct sk_buff *p;
1312 int num_nodes;
1313 int node_pos;
1314 int prec_out;
1315 int pmsk;
1316 int i;
1317
1318 table = (struct brcmf_fws_mac_descriptor *)&fws->desc;
1319 num_nodes = sizeof(fws->desc) / sizeof(struct brcmf_fws_mac_descriptor);
1320 node_pos = fws->deq_node_pos[fifo];
1321
1322 for (i = 0; i < num_nodes; i++) {
1323 entry = &table[(node_pos + i) % num_nodes];
1324 if (!entry->occupied ||
1325 brcmf_fws_macdesc_closed(fws, entry, fifo))
1326 continue;
1327
1328 if (entry->suppressed)
1329 pmsk = 2;
1330 else
1331 pmsk = 3;
1332 p = brcmu_pktq_mdeq(&entry->psq, pmsk << (fifo * 2), &prec_out);
1333 if (p == NULL) {
1334 if (entry->suppressed) {
1335 if (entry->suppr_transit_count)
1336 continue;
1337 entry->suppressed = false;
1338 p = brcmu_pktq_mdeq(&entry->psq,
1339 1 << (fifo * 2), &prec_out);
1340 }
1341 }
1342 if (p == NULL)
1343 continue;
1344
1345 brcmf_fws_macdesc_use_req_credit(entry, p);
1346
1347 /* move dequeue position to ensure fair round-robin */
1348 fws->deq_node_pos[fifo] = (node_pos + i + 1) % num_nodes;
1349 brcmf_fws_flow_control_check(fws, &entry->psq,
1350 brcmf_skb_if_flags_get_field(p,
1351 INDEX)
1352 );
1353 /*
1354 * A packet has been picked up, update traffic
1355 * availability bitmap, if applicable
1356 */
1357 brcmf_fws_tim_update(fws, entry, fifo, false);
1358
1359 /*
1360 * decrement total enqueued fifo packets and
1361 * clear delay bitmap if done.
1362 */
1363 fws->fifo_enqpkt[fifo]--;
1364 if (fws->fifo_enqpkt[fifo] == 0)
1365 fws->fifo_delay_map &= ~(1 << fifo);
1366 goto done;
1367 }
1368 p = NULL;
1369 done:
1370 brcmf_dbg(DATA, "exit: fifo %d skb %p\n", fifo, p);
1371 return p;
1372 }
1373
1374 static int brcmf_fws_txstatus_suppressed(struct brcmf_fws_info *fws, int fifo,
1375 struct sk_buff *skb, u32 genbit,
1376 u16 seq)
1377 {
1378 struct brcmf_fws_mac_descriptor *entry = brcmf_skbcb(skb)->mac;
1379 u32 hslot;
1380 int ret;
1381 u8 ifidx;
1382
1383 hslot = brcmf_skb_htod_tag_get_field(skb, HSLOT);
1384
1385 /* this packet was suppressed */
1386 if (!entry->suppressed) {
1387 entry->suppressed = true;
1388 entry->suppr_transit_count = entry->transit_count;
1389 brcmf_dbg(DATA, "suppress %s: transit %d\n",
1390 entry->name, entry->transit_count);
1391 }
1392
1393 entry->generation = genbit;
1394
1395 ret = brcmf_proto_hdrpull(fws->drvr, false, &ifidx, skb);
1396 if (ret == 0)
1397 brcmf_skb_htod_tag_set_field(skb, GENERATION, genbit);
1398 brcmf_skbcb(skb)->htod_seq = seq;
1399 if (brcmf_skb_htod_seq_get_field(skb, FROMFW)) {
1400 brcmf_skb_htod_seq_set_field(skb, FROMDRV, 1);
1401 brcmf_skb_htod_seq_set_field(skb, FROMFW, 0);
1402 } else {
1403 brcmf_skb_htod_seq_set_field(skb, FROMDRV, 0);
1404 }
1405 ret = brcmf_fws_enq(fws, BRCMF_FWS_SKBSTATE_SUPPRESSED, fifo,
1406 skb);
1407 if (ret != 0) {
1408 /* suppress q is full or hdrpull failed, drop this packet */
1409 brcmf_fws_hanger_poppkt(&fws->hanger, hslot, &skb,
1410 true);
1411 } else {
1412 /*
1413 * Mark suppressed to avoid a double free during
1414 * wlfc cleanup
1415 */
1416 brcmf_fws_hanger_mark_suppressed(&fws->hanger, hslot);
1417 }
1418
1419 return ret;
1420 }
1421
1422 static int
1423 brcmf_fws_txs_process(struct brcmf_fws_info *fws, u8 flags, u32 hslot,
1424 u32 genbit, u16 seq)
1425 {
1426 u32 fifo;
1427 int ret;
1428 bool remove_from_hanger = true;
1429 struct sk_buff *skb;
1430 struct brcmf_skbuff_cb *skcb;
1431 struct brcmf_fws_mac_descriptor *entry = NULL;
1432
1433 brcmf_dbg(DATA, "flags %d\n", flags);
1434
1435 if (flags == BRCMF_FWS_TXSTATUS_DISCARD)
1436 fws->stats.txs_discard++;
1437 else if (flags == BRCMF_FWS_TXSTATUS_CORE_SUPPRESS) {
1438 fws->stats.txs_supp_core++;
1439 remove_from_hanger = false;
1440 } else if (flags == BRCMF_FWS_TXSTATUS_FW_PS_SUPPRESS) {
1441 fws->stats.txs_supp_ps++;
1442 remove_from_hanger = false;
1443 } else if (flags == BRCMF_FWS_TXSTATUS_FW_TOSSED)
1444 fws->stats.txs_tossed++;
1445 else if (flags == BRCMF_FWS_TXSTATUS_HOST_TOSSED)
1446 fws->stats.txs_host_tossed++;
1447 else
1448 brcmf_err("unexpected txstatus\n");
1449
1450 ret = brcmf_fws_hanger_poppkt(&fws->hanger, hslot, &skb,
1451 remove_from_hanger);
1452 if (ret != 0) {
1453 brcmf_err("no packet in hanger slot: hslot=%d\n", hslot);
1454 return ret;
1455 }
1456
1457 skcb = brcmf_skbcb(skb);
1458 entry = skcb->mac;
1459 if (WARN_ON(!entry)) {
1460 brcmu_pkt_buf_free_skb(skb);
1461 return -EINVAL;
1462 }
1463 entry->transit_count--;
1464 if (entry->suppressed && entry->suppr_transit_count)
1465 entry->suppr_transit_count--;
1466
1467 brcmf_dbg(DATA, "%s flags %d htod %X seq %X\n", entry->name, flags,
1468 skcb->htod, seq);
1469
1470 /* pick up the implicit credit from this packet */
1471 fifo = brcmf_skb_htod_tag_get_field(skb, FIFO);
1472 if ((fws->fcmode == BRCMF_FWS_FCMODE_IMPLIED_CREDIT) ||
1473 (brcmf_skb_if_flags_get_field(skb, REQ_CREDIT)) ||
1474 (flags == BRCMF_FWS_TXSTATUS_HOST_TOSSED)) {
1475 brcmf_fws_return_credits(fws, fifo, 1);
1476 brcmf_fws_schedule_deq(fws);
1477 }
1478 brcmf_fws_macdesc_return_req_credit(skb);
1479
1480 if (!remove_from_hanger)
1481 ret = brcmf_fws_txstatus_suppressed(fws, fifo, skb, genbit,
1482 seq);
1483
1484 if (remove_from_hanger || ret)
1485 brcmf_txfinalize(fws->drvr, skb, true);
1486
1487 return 0;
1488 }
1489
1490 static int brcmf_fws_fifocreditback_indicate(struct brcmf_fws_info *fws,
1491 u8 *data)
1492 {
1493 int i;
1494
1495 if (fws->fcmode != BRCMF_FWS_FCMODE_EXPLICIT_CREDIT) {
1496 brcmf_dbg(INFO, "ignored\n");
1497 return BRCMF_FWS_RET_OK_NOSCHEDULE;
1498 }
1499
1500 brcmf_dbg(DATA, "enter: data %pM\n", data);
1501 brcmf_fws_lock(fws);
1502 for (i = 0; i < BRCMF_FWS_FIFO_COUNT; i++)
1503 brcmf_fws_return_credits(fws, i, data[i]);
1504
1505 brcmf_dbg(DATA, "map: credit %x delay %x\n", fws->fifo_credit_map,
1506 fws->fifo_delay_map);
1507 brcmf_fws_unlock(fws);
1508 return BRCMF_FWS_RET_OK_SCHEDULE;
1509 }
1510
1511 static int brcmf_fws_txstatus_indicate(struct brcmf_fws_info *fws, u8 *data)
1512 {
1513 __le32 status_le;
1514 __le16 seq_le;
1515 u32 status;
1516 u32 hslot;
1517 u32 genbit;
1518 u8 flags;
1519 u16 seq;
1520
1521 fws->stats.txs_indicate++;
1522 memcpy(&status_le, data, sizeof(status_le));
1523 status = le32_to_cpu(status_le);
1524 flags = brcmf_txstatus_get_field(status, FLAGS);
1525 hslot = brcmf_txstatus_get_field(status, HSLOT);
1526 genbit = brcmf_txstatus_get_field(status, GENERATION);
1527 if (BRCMF_FWS_MODE_GET_REUSESEQ(fws->mode)) {
1528 memcpy(&seq_le, &data[BRCMF_FWS_TYPE_PKTTAG_LEN],
1529 sizeof(seq_le));
1530 seq = le16_to_cpu(seq_le);
1531 } else {
1532 seq = 0;
1533 }
1534
1535 brcmf_fws_lock(fws);
1536 brcmf_fws_txs_process(fws, flags, hslot, genbit, seq);
1537 brcmf_fws_unlock(fws);
1538 return BRCMF_FWS_RET_OK_NOSCHEDULE;
1539 }
1540
1541 static int brcmf_fws_dbg_seqnum_check(struct brcmf_fws_info *fws, u8 *data)
1542 {
1543 __le32 timestamp;
1544
1545 memcpy(&timestamp, &data[2], sizeof(timestamp));
1546 brcmf_dbg(CTL, "received: seq %d, timestamp %d\n", data[1],
1547 le32_to_cpu(timestamp));
1548 return 0;
1549 }
1550
1551 static int brcmf_fws_notify_credit_map(struct brcmf_if *ifp,
1552 const struct brcmf_event_msg *e,
1553 void *data)
1554 {
1555 struct brcmf_fws_info *fws = ifp->drvr->fws;
1556 int i;
1557 u8 *credits = data;
1558
1559 if (e->datalen < BRCMF_FWS_FIFO_COUNT) {
1560 brcmf_err("event payload too small (%d)\n", e->datalen);
1561 return -EINVAL;
1562 }
1563 if (fws->creditmap_received)
1564 return 0;
1565
1566 fws->creditmap_received = true;
1567
1568 brcmf_dbg(TRACE, "enter: credits %pM\n", credits);
1569 brcmf_fws_lock(fws);
1570 for (i = 0; i < ARRAY_SIZE(fws->fifo_credit); i++) {
1571 if (*credits)
1572 fws->fifo_credit_map |= 1 << i;
1573 else
1574 fws->fifo_credit_map &= ~(1 << i);
1575 fws->fifo_credit[i] = *credits++;
1576 }
1577 brcmf_fws_schedule_deq(fws);
1578 brcmf_fws_unlock(fws);
1579 return 0;
1580 }
1581
1582 static int brcmf_fws_notify_bcmc_credit_support(struct brcmf_if *ifp,
1583 const struct brcmf_event_msg *e,
1584 void *data)
1585 {
1586 struct brcmf_fws_info *fws = ifp->drvr->fws;
1587
1588 brcmf_fws_lock(fws);
1589 if (fws)
1590 fws->bcmc_credit_check = true;
1591 brcmf_fws_unlock(fws);
1592 return 0;
1593 }
1594
1595 int brcmf_fws_hdrpull(struct brcmf_pub *drvr, int ifidx, s16 signal_len,
1596 struct sk_buff *skb)
1597 {
1598 struct brcmf_skb_reorder_data *rd;
1599 struct brcmf_fws_info *fws = drvr->fws;
1600 u8 *signal_data;
1601 s16 data_len;
1602 u8 type;
1603 u8 len;
1604 u8 *data;
1605 s32 status;
1606 s32 err;
1607
1608 brcmf_dbg(HDRS, "enter: ifidx %d, skblen %u, sig %d\n",
1609 ifidx, skb->len, signal_len);
1610
1611 WARN_ON(signal_len > skb->len);
1612
1613 if (!signal_len)
1614 return 0;
1615 /* if flow control disabled, skip to packet data and leave */
1616 if (!fws->fw_signals) {
1617 skb_pull(skb, signal_len);
1618 return 0;
1619 }
1620
1621 fws->stats.header_pulls++;
1622 data_len = signal_len;
1623 signal_data = skb->data;
1624
1625 status = BRCMF_FWS_RET_OK_NOSCHEDULE;
1626 while (data_len > 0) {
1627 /* extract tlv info */
1628 type = signal_data[0];
1629
1630 /* FILLER type is actually not a TLV, but
1631 * a single byte that can be skipped.
1632 */
1633 if (type == BRCMF_FWS_TYPE_FILLER) {
1634 signal_data += 1;
1635 data_len -= 1;
1636 continue;
1637 }
1638 len = signal_data[1];
1639 data = signal_data + 2;
1640
1641 brcmf_dbg(HDRS, "tlv type=%s (%d), len=%d (%d)\n",
1642 brcmf_fws_get_tlv_name(type), type, len,
1643 brcmf_fws_get_tlv_len(fws, type));
1644
1645 /* abort parsing when length invalid */
1646 if (data_len < len + 2)
1647 break;
1648
1649 if (len < brcmf_fws_get_tlv_len(fws, type))
1650 break;
1651
1652 err = BRCMF_FWS_RET_OK_NOSCHEDULE;
1653 switch (type) {
1654 case BRCMF_FWS_TYPE_COMP_TXSTATUS:
1655 break;
1656 case BRCMF_FWS_TYPE_HOST_REORDER_RXPKTS:
1657 rd = (struct brcmf_skb_reorder_data *)skb->cb;
1658 rd->reorder = data;
1659 break;
1660 case BRCMF_FWS_TYPE_MACDESC_ADD:
1661 case BRCMF_FWS_TYPE_MACDESC_DEL:
1662 brcmf_fws_macdesc_indicate(fws, type, data);
1663 break;
1664 case BRCMF_FWS_TYPE_MAC_OPEN:
1665 case BRCMF_FWS_TYPE_MAC_CLOSE:
1666 err = brcmf_fws_macdesc_state_indicate(fws, type, data);
1667 break;
1668 case BRCMF_FWS_TYPE_INTERFACE_OPEN:
1669 case BRCMF_FWS_TYPE_INTERFACE_CLOSE:
1670 err = brcmf_fws_interface_state_indicate(fws, type,
1671 data);
1672 break;
1673 case BRCMF_FWS_TYPE_MAC_REQUEST_CREDIT:
1674 case BRCMF_FWS_TYPE_MAC_REQUEST_PACKET:
1675 err = brcmf_fws_request_indicate(fws, type, data);
1676 break;
1677 case BRCMF_FWS_TYPE_TXSTATUS:
1678 brcmf_fws_txstatus_indicate(fws, data);
1679 break;
1680 case BRCMF_FWS_TYPE_FIFO_CREDITBACK:
1681 err = brcmf_fws_fifocreditback_indicate(fws, data);
1682 break;
1683 case BRCMF_FWS_TYPE_RSSI:
1684 brcmf_fws_rssi_indicate(fws, *data);
1685 break;
1686 case BRCMF_FWS_TYPE_TRANS_ID:
1687 brcmf_fws_dbg_seqnum_check(fws, data);
1688 break;
1689 case BRCMF_FWS_TYPE_PKTTAG:
1690 case BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP:
1691 default:
1692 fws->stats.tlv_invalid_type++;
1693 break;
1694 }
1695 if (err == BRCMF_FWS_RET_OK_SCHEDULE)
1696 status = BRCMF_FWS_RET_OK_SCHEDULE;
1697 signal_data += len + 2;
1698 data_len -= len + 2;
1699 }
1700
1701 if (data_len != 0)
1702 fws->stats.tlv_parse_failed++;
1703
1704 if (status == BRCMF_FWS_RET_OK_SCHEDULE)
1705 brcmf_fws_schedule_deq(fws);
1706
1707 /* signalling processing result does
1708 * not affect the actual ethernet packet.
1709 */
1710 skb_pull(skb, signal_len);
1711
1712 /* this may be a signal-only packet
1713 */
1714 if (skb->len == 0)
1715 fws->stats.header_only_pkt++;
1716
1717 return 0;
1718 }
1719
1720 static void brcmf_fws_precommit_skb(struct brcmf_fws_info *fws, int fifo,
1721 struct sk_buff *p)
1722 {
1723 struct brcmf_skbuff_cb *skcb = brcmf_skbcb(p);
1724 struct brcmf_fws_mac_descriptor *entry = skcb->mac;
1725 u8 flags;
1726
1727 if (skcb->state != BRCMF_FWS_SKBSTATE_SUPPRESSED)
1728 brcmf_skb_htod_tag_set_field(p, GENERATION, entry->generation);
1729 flags = BRCMF_FWS_HTOD_FLAG_PKTFROMHOST;
1730 if (brcmf_skb_if_flags_get_field(p, REQUESTED)) {
1731 /*
1732 * Indicate that this packet is being sent in response to an
1733 * explicit request from the firmware side.
1734 */
1735 flags |= BRCMF_FWS_HTOD_FLAG_PKT_REQUESTED;
1736 }
1737 brcmf_skb_htod_tag_set_field(p, FLAGS, flags);
1738 brcmf_fws_hdrpush(fws, p);
1739 }
1740
1741 static void brcmf_fws_rollback_toq(struct brcmf_fws_info *fws,
1742 struct sk_buff *skb, int fifo)
1743 {
1744 struct brcmf_fws_mac_descriptor *entry;
1745 struct sk_buff *pktout;
1746 int qidx, hslot;
1747 int rc = 0;
1748
1749 entry = brcmf_skbcb(skb)->mac;
1750 if (entry->occupied) {
1751 qidx = 2 * fifo;
1752 if (brcmf_skbcb(skb)->state == BRCMF_FWS_SKBSTATE_SUPPRESSED)
1753 qidx++;
1754
1755 pktout = brcmu_pktq_penq_head(&entry->psq, qidx, skb);
1756 if (pktout == NULL) {
1757 brcmf_err("%s queue %d full\n", entry->name, qidx);
1758 rc = -ENOSPC;
1759 }
1760 } else {
1761 brcmf_err("%s entry removed\n", entry->name);
1762 rc = -ENOENT;
1763 }
1764
1765 if (rc) {
1766 fws->stats.rollback_failed++;
1767 hslot = brcmf_skb_htod_tag_get_field(skb, HSLOT);
1768 brcmf_fws_txs_process(fws, BRCMF_FWS_TXSTATUS_HOST_TOSSED,
1769 hslot, 0, 0);
1770 } else {
1771 fws->stats.rollback_success++;
1772 brcmf_fws_return_credits(fws, fifo, 1);
1773 brcmf_fws_macdesc_return_req_credit(skb);
1774 }
1775 }
1776
1777 static int brcmf_fws_borrow_credit(struct brcmf_fws_info *fws)
1778 {
1779 int lender_ac;
1780
1781 if (time_after(fws->borrow_defer_timestamp, jiffies)) {
1782 fws->fifo_credit_map &= ~(1 << BRCMF_FWS_FIFO_AC_BE);
1783 return -ENAVAIL;
1784 }
1785
1786 for (lender_ac = 0; lender_ac <= BRCMF_FWS_FIFO_AC_VO; lender_ac++) {
1787 if (fws->fifo_credit[lender_ac]) {
1788 fws->credits_borrowed[lender_ac]++;
1789 fws->fifo_credit[lender_ac]--;
1790 if (fws->fifo_credit[lender_ac] == 0)
1791 fws->fifo_credit_map &= ~(1 << lender_ac);
1792 fws->fifo_credit_map |= (1 << BRCMF_FWS_FIFO_AC_BE);
1793 brcmf_dbg(DATA, "borrow credit from: %d\n", lender_ac);
1794 return 0;
1795 }
1796 }
1797 fws->fifo_credit_map &= ~(1 << BRCMF_FWS_FIFO_AC_BE);
1798 return -ENAVAIL;
1799 }
1800
1801 static int brcmf_fws_commit_skb(struct brcmf_fws_info *fws, int fifo,
1802 struct sk_buff *skb)
1803 {
1804 struct brcmf_skbuff_cb *skcb = brcmf_skbcb(skb);
1805 struct brcmf_fws_mac_descriptor *entry;
1806 struct brcmf_bus *bus = fws->drvr->bus_if;
1807 int rc;
1808 u8 ifidx;
1809
1810 entry = skcb->mac;
1811 if (IS_ERR(entry))
1812 return PTR_ERR(entry);
1813
1814 brcmf_fws_precommit_skb(fws, fifo, skb);
1815 entry->transit_count++;
1816 if (entry->suppressed)
1817 entry->suppr_transit_count++;
1818 brcmf_fws_unlock(fws);
1819 rc = brcmf_bus_txdata(bus, skb);
1820 brcmf_fws_lock(fws);
1821 brcmf_dbg(DATA, "%s flags %X htod %X bus_tx %d\n", entry->name,
1822 skcb->if_flags, skcb->htod, rc);
1823 if (rc < 0) {
1824 entry->transit_count--;
1825 if (entry->suppressed)
1826 entry->suppr_transit_count--;
1827 brcmf_proto_hdrpull(fws->drvr, false, &ifidx, skb);
1828 goto rollback;
1829 }
1830
1831 fws->stats.pkt2bus++;
1832 fws->stats.send_pkts[fifo]++;
1833 if (brcmf_skb_if_flags_get_field(skb, REQUESTED))
1834 fws->stats.requested_sent[fifo]++;
1835
1836 return rc;
1837
1838 rollback:
1839 brcmf_fws_rollback_toq(fws, skb, fifo);
1840 return rc;
1841 }
1842
1843 static int brcmf_fws_assign_htod(struct brcmf_fws_info *fws, struct sk_buff *p,
1844 int fifo)
1845 {
1846 struct brcmf_skbuff_cb *skcb = brcmf_skbcb(p);
1847 int rc, hslot;
1848
1849 skcb->htod = 0;
1850 skcb->htod_seq = 0;
1851 hslot = brcmf_fws_hanger_get_free_slot(&fws->hanger);
1852 brcmf_skb_htod_tag_set_field(p, HSLOT, hslot);
1853 brcmf_skb_htod_tag_set_field(p, FREERUN, skcb->mac->seq[fifo]);
1854 brcmf_skb_htod_tag_set_field(p, FIFO, fifo);
1855 rc = brcmf_fws_hanger_pushpkt(&fws->hanger, p, hslot);
1856 if (!rc)
1857 skcb->mac->seq[fifo]++;
1858 else
1859 fws->stats.generic_error++;
1860 return rc;
1861 }
1862
1863 int brcmf_fws_process_skb(struct brcmf_if *ifp, struct sk_buff *skb)
1864 {
1865 struct brcmf_pub *drvr = ifp->drvr;
1866 struct brcmf_fws_info *fws = drvr->fws;
1867 struct brcmf_skbuff_cb *skcb = brcmf_skbcb(skb);
1868 struct ethhdr *eh = (struct ethhdr *)(skb->data);
1869 int fifo = BRCMF_FWS_FIFO_BCMC;
1870 bool multicast = is_multicast_ether_addr(eh->h_dest);
1871 bool pae = eh->h_proto == htons(ETH_P_PAE);
1872
1873 brcmf_dbg(DATA, "tx proto=0x%X\n", ntohs(eh->h_proto));
1874 /* determine the priority */
1875 if (!skb->priority)
1876 skb->priority = cfg80211_classify8021d(skb);
1877
1878 drvr->tx_multicast += !!multicast;
1879 if (pae)
1880 atomic_inc(&ifp->pend_8021x_cnt);
1881
1882 /* set control buffer information */
1883 skcb->if_flags = 0;
1884 skcb->state = BRCMF_FWS_SKBSTATE_NEW;
1885 brcmf_skb_if_flags_set_field(skb, INDEX, ifp->ifidx);
1886 if (!multicast)
1887 fifo = brcmf_fws_prio2fifo[skb->priority];
1888
1889 brcmf_fws_lock(fws);
1890 if (fifo != BRCMF_FWS_FIFO_AC_BE && fifo < BRCMF_FWS_FIFO_BCMC)
1891 fws->borrow_defer_timestamp = jiffies +
1892 BRCMF_FWS_BORROW_DEFER_PERIOD;
1893
1894 skcb->mac = brcmf_fws_macdesc_find(fws, ifp, eh->h_dest);
1895 brcmf_dbg(DATA, "%s mac %pM multi %d fifo %d\n", skcb->mac->name,
1896 eh->h_dest, multicast, fifo);
1897 if (!brcmf_fws_assign_htod(fws, skb, fifo)) {
1898 brcmf_fws_enq(fws, BRCMF_FWS_SKBSTATE_DELAYED, fifo, skb);
1899 brcmf_fws_schedule_deq(fws);
1900 } else {
1901 brcmf_err("drop skb: no hanger slot\n");
1902 if (pae) {
1903 atomic_dec(&ifp->pend_8021x_cnt);
1904 if (waitqueue_active(&ifp->pend_8021x_wait))
1905 wake_up(&ifp->pend_8021x_wait);
1906 }
1907 brcmu_pkt_buf_free_skb(skb);
1908 }
1909 brcmf_fws_unlock(fws);
1910 return 0;
1911 }
1912
1913 void brcmf_fws_reset_interface(struct brcmf_if *ifp)
1914 {
1915 struct brcmf_fws_mac_descriptor *entry = ifp->fws_desc;
1916
1917 brcmf_dbg(TRACE, "enter: idx=%d\n", ifp->bssidx);
1918 if (!entry)
1919 return;
1920
1921 brcmf_fws_macdesc_init(entry, ifp->mac_addr, ifp->ifidx);
1922 }
1923
1924 void brcmf_fws_add_interface(struct brcmf_if *ifp)
1925 {
1926 struct brcmf_fws_info *fws = ifp->drvr->fws;
1927 struct brcmf_fws_mac_descriptor *entry;
1928
1929 if (!ifp->ndev)
1930 return;
1931
1932 entry = &fws->desc.iface[ifp->ifidx];
1933 ifp->fws_desc = entry;
1934 brcmf_fws_macdesc_init(entry, ifp->mac_addr, ifp->ifidx);
1935 brcmf_fws_macdesc_set_name(fws, entry);
1936 brcmu_pktq_init(&entry->psq, BRCMF_FWS_PSQ_PREC_COUNT,
1937 BRCMF_FWS_PSQ_LEN);
1938 brcmf_dbg(TRACE, "added %s\n", entry->name);
1939 }
1940
1941 void brcmf_fws_del_interface(struct brcmf_if *ifp)
1942 {
1943 struct brcmf_fws_mac_descriptor *entry = ifp->fws_desc;
1944
1945 if (!entry)
1946 return;
1947
1948 brcmf_fws_lock(ifp->drvr->fws);
1949 ifp->fws_desc = NULL;
1950 brcmf_dbg(TRACE, "deleting %s\n", entry->name);
1951 brcmf_fws_macdesc_deinit(entry);
1952 brcmf_fws_cleanup(ifp->drvr->fws, ifp->ifidx);
1953 brcmf_fws_unlock(ifp->drvr->fws);
1954 }
1955
1956 static void brcmf_fws_dequeue_worker(struct work_struct *worker)
1957 {
1958 struct brcmf_fws_info *fws;
1959 struct brcmf_pub *drvr;
1960 struct sk_buff *skb;
1961 int fifo;
1962 u32 hslot;
1963 u32 ifidx;
1964 int ret;
1965
1966 fws = container_of(worker, struct brcmf_fws_info, fws_dequeue_work);
1967 drvr = fws->drvr;
1968
1969 brcmf_fws_lock(fws);
1970 for (fifo = BRCMF_FWS_FIFO_BCMC; fifo >= 0 && !fws->bus_flow_blocked;
1971 fifo--) {
1972 if (!brcmf_fws_fc_active(fws)) {
1973 while ((skb = brcmf_fws_deq(fws, fifo)) != NULL) {
1974 hslot = brcmf_skb_htod_tag_get_field(skb,
1975 HSLOT);
1976 brcmf_fws_hanger_poppkt(&fws->hanger, hslot,
1977 &skb, true);
1978 ifidx = brcmf_skb_if_flags_get_field(skb,
1979 INDEX);
1980 brcmf_proto_hdrpush(drvr, ifidx, 0, skb);
1981 /* Use bus module to send data frame */
1982 brcmf_fws_unlock(fws);
1983 ret = brcmf_bus_txdata(drvr->bus_if, skb);
1984 brcmf_fws_lock(fws);
1985 if (ret < 0)
1986 brcmf_txfinalize(drvr, skb, false);
1987 if (fws->bus_flow_blocked)
1988 break;
1989 }
1990 continue;
1991 }
1992 while ((fws->fifo_credit[fifo]) || ((!fws->bcmc_credit_check) &&
1993 (fifo == BRCMF_FWS_FIFO_BCMC))) {
1994 skb = brcmf_fws_deq(fws, fifo);
1995 if (!skb)
1996 break;
1997 fws->fifo_credit[fifo]--;
1998 if (brcmf_fws_commit_skb(fws, fifo, skb))
1999 break;
2000 if (fws->bus_flow_blocked)
2001 break;
2002 }
2003 if ((fifo == BRCMF_FWS_FIFO_AC_BE) &&
2004 (fws->fifo_credit[fifo] == 0) &&
2005 (!fws->bus_flow_blocked)) {
2006 while (brcmf_fws_borrow_credit(fws) == 0) {
2007 skb = brcmf_fws_deq(fws, fifo);
2008 if (!skb) {
2009 brcmf_fws_return_credits(fws, fifo, 1);
2010 break;
2011 }
2012 if (brcmf_fws_commit_skb(fws, fifo, skb))
2013 break;
2014 if (fws->bus_flow_blocked)
2015 break;
2016 }
2017 }
2018 }
2019 brcmf_fws_unlock(fws);
2020 }
2021
2022 int brcmf_fws_init(struct brcmf_pub *drvr)
2023 {
2024 struct brcmf_fws_info *fws;
2025 u32 tlv = BRCMF_FWS_FLAGS_RSSI_SIGNALS;
2026 int rc;
2027 u32 mode;
2028
2029 drvr->fws = kzalloc(sizeof(*(drvr->fws)), GFP_KERNEL);
2030 if (!drvr->fws) {
2031 rc = -ENOMEM;
2032 goto fail;
2033 }
2034
2035 fws = drvr->fws;
2036
2037 spin_lock_init(&fws->spinlock);
2038
2039 /* set linkage back */
2040 fws->drvr = drvr;
2041 fws->fcmode = fcmode;
2042
2043 fws->fws_wq = create_singlethread_workqueue("brcmf_fws_wq");
2044 if (fws->fws_wq == NULL) {
2045 brcmf_err("workqueue creation failed\n");
2046 rc = -EBADF;
2047 goto fail;
2048 }
2049 INIT_WORK(&fws->fws_dequeue_work, brcmf_fws_dequeue_worker);
2050
2051 /* enable firmware signalling if fcmode active */
2052 if (fws->fcmode != BRCMF_FWS_FCMODE_NONE)
2053 tlv |= BRCMF_FWS_FLAGS_XONXOFF_SIGNALS |
2054 BRCMF_FWS_FLAGS_CREDIT_STATUS_SIGNALS |
2055 BRCMF_FWS_FLAGS_HOST_PROPTXSTATUS_ACTIVE |
2056 BRCMF_FWS_FLAGS_HOST_RXREORDER_ACTIVE;
2057
2058 rc = brcmf_fweh_register(drvr, BRCMF_E_FIFO_CREDIT_MAP,
2059 brcmf_fws_notify_credit_map);
2060 if (rc < 0) {
2061 brcmf_err("register credit map handler failed\n");
2062 goto fail;
2063 }
2064 rc = brcmf_fweh_register(drvr, BRCMF_E_BCMC_CREDIT_SUPPORT,
2065 brcmf_fws_notify_bcmc_credit_support);
2066 if (rc < 0) {
2067 brcmf_err("register bcmc credit handler failed\n");
2068 brcmf_fweh_unregister(drvr, BRCMF_E_FIFO_CREDIT_MAP);
2069 goto fail;
2070 }
2071
2072 /* Setting the iovar may fail if feature is unsupported
2073 * so leave the rc as is so driver initialization can
2074 * continue. Set mode back to none indicating not enabled.
2075 */
2076 fws->fw_signals = true;
2077 if (brcmf_fil_iovar_int_set(drvr->iflist[0], "tlv", tlv)) {
2078 brcmf_err("failed to set bdcv2 tlv signaling\n");
2079 fws->fcmode = BRCMF_FWS_FCMODE_NONE;
2080 fws->fw_signals = false;
2081 }
2082
2083 if (brcmf_fil_iovar_int_set(drvr->iflist[0], "ampdu_hostreorder", 1))
2084 brcmf_dbg(INFO, "enabling AMPDU host-reorder failed\n");
2085
2086 /* Enable seq number reuse, if supported */
2087 if (brcmf_fil_iovar_int_get(drvr->iflist[0], "wlfc_mode", &mode) == 0) {
2088 if (BRCMF_FWS_MODE_GET_REUSESEQ(mode)) {
2089 mode = 0;
2090 BRCMF_FWS_MODE_SET_REUSESEQ(mode, 1);
2091 if (brcmf_fil_iovar_int_set(drvr->iflist[0],
2092 "wlfc_mode", mode) == 0) {
2093 BRCMF_FWS_MODE_SET_REUSESEQ(fws->mode, 1);
2094 }
2095 }
2096 }
2097
2098 brcmf_fws_hanger_init(&fws->hanger);
2099 brcmf_fws_macdesc_init(&fws->desc.other, NULL, 0);
2100 brcmf_fws_macdesc_set_name(fws, &fws->desc.other);
2101 brcmu_pktq_init(&fws->desc.other.psq, BRCMF_FWS_PSQ_PREC_COUNT,
2102 BRCMF_FWS_PSQ_LEN);
2103
2104 /* create debugfs file for statistics */
2105 brcmf_debugfs_create_fws_stats(drvr, &fws->stats);
2106
2107 brcmf_dbg(INFO, "%s bdcv2 tlv signaling [%x]\n",
2108 fws->fw_signals ? "enabled" : "disabled", tlv);
2109 return 0;
2110
2111 fail:
2112 brcmf_fws_deinit(drvr);
2113 return rc;
2114 }
2115
2116 void brcmf_fws_deinit(struct brcmf_pub *drvr)
2117 {
2118 struct brcmf_fws_info *fws = drvr->fws;
2119
2120 if (!fws)
2121 return;
2122
2123 if (drvr->fws->fws_wq)
2124 destroy_workqueue(drvr->fws->fws_wq);
2125
2126 /* cleanup */
2127 brcmf_fws_lock(fws);
2128 brcmf_fws_cleanup(fws, -1);
2129 drvr->fws = NULL;
2130 brcmf_fws_unlock(fws);
2131
2132 /* free top structure */
2133 kfree(fws);
2134 }
2135
2136 bool brcmf_fws_fc_active(struct brcmf_fws_info *fws)
2137 {
2138 if (!fws->creditmap_received)
2139 return false;
2140
2141 return fws->fcmode != BRCMF_FWS_FCMODE_NONE;
2142 }
2143
2144 void brcmf_fws_bustxfail(struct brcmf_fws_info *fws, struct sk_buff *skb)
2145 {
2146 u32 hslot;
2147
2148 if (brcmf_skbcb(skb)->state == BRCMF_FWS_SKBSTATE_TIM) {
2149 brcmu_pkt_buf_free_skb(skb);
2150 return;
2151 }
2152 brcmf_fws_lock(fws);
2153 hslot = brcmf_skb_htod_tag_get_field(skb, HSLOT);
2154 brcmf_fws_txs_process(fws, BRCMF_FWS_TXSTATUS_HOST_TOSSED, hslot, 0, 0);
2155 brcmf_fws_unlock(fws);
2156 }
2157
2158 void brcmf_fws_bus_blocked(struct brcmf_pub *drvr, bool flow_blocked)
2159 {
2160 struct brcmf_fws_info *fws = drvr->fws;
2161
2162 fws->bus_flow_blocked = flow_blocked;
2163 if (!flow_blocked)
2164 brcmf_fws_schedule_deq(fws);
2165 else
2166 fws->stats.bus_flow_block++;
2167 }
Linux kernel - Deliverables
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