1 /******************************************************************************
2 *
3 * Copyright 2004-2012 Broadcom Corporation
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 ******************************************************************************/
18
19 /******************************************************************************
20 *
21 * This file contains the L2CAP 1.2 Flow Control and retransmissions
22 * functions
23 *
24 ******************************************************************************/
25
26 #include <base/logging.h>
27 #include <log/log.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31
32 #include "bt_common.h"
33 #include "bt_types.h"
34 #include "btm_api.h"
35 #include "btm_int.h"
36 #include "btu.h"
37 #include "hcimsgs.h"
38 #include "l2c_api.h"
39 #include "l2c_int.h"
40 #include "l2cdefs.h"
41
42 /* Flag passed to retransmit_i_frames() when all packets should be retransmitted
43 */
44 #define L2C_FCR_RETX_ALL_PKTS 0xFF
45
46 /* this is the minimal offset required by OBX to process incoming packets */
47 static const uint16_t OBX_BUF_MIN_OFFSET = 4;
48
49 static const char* SAR_types[] = {"Unsegmented", "Start", "End",
50 "Continuation"};
51 static const char* SUP_types[] = {"RR", "REJ", "RNR", "SREJ"};
52
53 /* Look-up table for the CRC calculation */
54 static const unsigned short crctab[256] = {
55 0x0000, 0xc0c1, 0xc181, 0x0140, 0xc301, 0x03c0, 0x0280, 0xc241, 0xc601,
56 0x06c0, 0x0780, 0xc741, 0x0500, 0xc5c1, 0xc481, 0x0440, 0xcc01, 0x0cc0,
57 0x0d80, 0xcd41, 0x0f00, 0xcfc1, 0xce81, 0x0e40, 0x0a00, 0xcac1, 0xcb81,
58 0x0b40, 0xc901, 0x09c0, 0x0880, 0xc841, 0xd801, 0x18c0, 0x1980, 0xd941,
59 0x1b00, 0xdbc1, 0xda81, 0x1a40, 0x1e00, 0xdec1, 0xdf81, 0x1f40, 0xdd01,
60 0x1dc0, 0x1c80, 0xdc41, 0x1400, 0xd4c1, 0xd581, 0x1540, 0xd701, 0x17c0,
61 0x1680, 0xd641, 0xd201, 0x12c0, 0x1380, 0xd341, 0x1100, 0xd1c1, 0xd081,
62 0x1040, 0xf001, 0x30c0, 0x3180, 0xf141, 0x3300, 0xf3c1, 0xf281, 0x3240,
63 0x3600, 0xf6c1, 0xf781, 0x3740, 0xf501, 0x35c0, 0x3480, 0xf441, 0x3c00,
64 0xfcc1, 0xfd81, 0x3d40, 0xff01, 0x3fc0, 0x3e80, 0xfe41, 0xfa01, 0x3ac0,
65 0x3b80, 0xfb41, 0x3900, 0xf9c1, 0xf881, 0x3840, 0x2800, 0xe8c1, 0xe981,
66 0x2940, 0xeb01, 0x2bc0, 0x2a80, 0xea41, 0xee01, 0x2ec0, 0x2f80, 0xef41,
67 0x2d00, 0xedc1, 0xec81, 0x2c40, 0xe401, 0x24c0, 0x2580, 0xe541, 0x2700,
68 0xe7c1, 0xe681, 0x2640, 0x2200, 0xe2c1, 0xe381, 0x2340, 0xe101, 0x21c0,
69 0x2080, 0xe041, 0xa001, 0x60c0, 0x6180, 0xa141, 0x6300, 0xa3c1, 0xa281,
70 0x6240, 0x6600, 0xa6c1, 0xa781, 0x6740, 0xa501, 0x65c0, 0x6480, 0xa441,
71 0x6c00, 0xacc1, 0xad81, 0x6d40, 0xaf01, 0x6fc0, 0x6e80, 0xae41, 0xaa01,
72 0x6ac0, 0x6b80, 0xab41, 0x6900, 0xa9c1, 0xa881, 0x6840, 0x7800, 0xb8c1,
73 0xb981, 0x7940, 0xbb01, 0x7bc0, 0x7a80, 0xba41, 0xbe01, 0x7ec0, 0x7f80,
74 0xbf41, 0x7d00, 0xbdc1, 0xbc81, 0x7c40, 0xb401, 0x74c0, 0x7580, 0xb541,
75 0x7700, 0xb7c1, 0xb681, 0x7640, 0x7200, 0xb2c1, 0xb381, 0x7340, 0xb101,
76 0x71c0, 0x7080, 0xb041, 0x5000, 0x90c1, 0x9181, 0x5140, 0x9301, 0x53c0,
77 0x5280, 0x9241, 0x9601, 0x56c0, 0x5780, 0x9741, 0x5500, 0x95c1, 0x9481,
78 0x5440, 0x9c01, 0x5cc0, 0x5d80, 0x9d41, 0x5f00, 0x9fc1, 0x9e81, 0x5e40,
79 0x5a00, 0x9ac1, 0x9b81, 0x5b40, 0x9901, 0x59c0, 0x5880, 0x9841, 0x8801,
80 0x48c0, 0x4980, 0x8941, 0x4b00, 0x8bc1, 0x8a81, 0x4a40, 0x4e00, 0x8ec1,
81 0x8f81, 0x4f40, 0x8d01, 0x4dc0, 0x4c80, 0x8c41, 0x4400, 0x84c1, 0x8581,
82 0x4540, 0x8701, 0x47c0, 0x4680, 0x8641, 0x8201, 0x42c0, 0x4380, 0x8341,
83 0x4100, 0x81c1, 0x8081, 0x4040,
84 };
85
86 /*******************************************************************************
87 * Static local functions
88 */
89 static bool process_reqseq(tL2C_CCB* p_ccb, uint16_t ctrl_word);
90 static void process_s_frame(tL2C_CCB* p_ccb, BT_HDR* p_buf, uint16_t ctrl_word);
91 static void process_i_frame(tL2C_CCB* p_ccb, BT_HDR* p_buf, uint16_t ctrl_word,
92 bool delay_ack);
93 static bool retransmit_i_frames(tL2C_CCB* p_ccb, uint8_t tx_seq);
94 static void prepare_I_frame(tL2C_CCB* p_ccb, BT_HDR* p_buf,
95 bool is_retransmission);
96 static void process_stream_frame(tL2C_CCB* p_ccb, BT_HDR* p_buf);
97 static bool do_sar_reassembly(tL2C_CCB* p_ccb, BT_HDR* p_buf,
98 uint16_t ctrl_word);
99
100 #if (L2CAP_ERTM_STATS == TRUE)
101 static void l2c_fcr_collect_ack_delay(tL2C_CCB* p_ccb, uint8_t num_bufs_acked);
102 #endif
103
104 /*******************************************************************************
105 *
106 * Function l2c_fcr_updcrc
107 *
108 * Description This function computes the CRC using the look-up table.
109 *
110 * Returns CRC
111 *
112 ******************************************************************************/
l2c_fcr_updcrc(unsigned short icrc,unsigned char * icp,int icnt)113 static unsigned short l2c_fcr_updcrc(unsigned short icrc, unsigned char* icp,
114 int icnt) {
115 unsigned short crc = icrc;
116 unsigned char* cp = icp;
117 int cnt = icnt;
118
119 while (cnt--) {
120 crc = ((crc >> 8) & 0xff) ^ crctab[(crc & 0xff) ^ *cp++];
121 }
122
123 return (crc);
124 }
125
126 /*******************************************************************************
127 *
128 * Function l2c_fcr_tx_get_fcs
129 *
130 * Description This function computes the CRC for a frame to be TXed.
131 *
132 * Returns CRC
133 *
134 ******************************************************************************/
l2c_fcr_tx_get_fcs(BT_HDR * p_buf)135 static uint16_t l2c_fcr_tx_get_fcs(BT_HDR* p_buf) {
136 uint8_t* p = ((uint8_t*)(p_buf + 1)) + p_buf->offset;
137
138 return (l2c_fcr_updcrc(L2CAP_FCR_INIT_CRC, p, p_buf->len));
139 }
140
141 /*******************************************************************************
142 *
143 * Function l2c_fcr_rx_get_fcs
144 *
145 * Description This function computes the CRC for a received frame.
146 *
147 * Returns CRC
148 *
149 ******************************************************************************/
l2c_fcr_rx_get_fcs(BT_HDR * p_buf)150 static uint16_t l2c_fcr_rx_get_fcs(BT_HDR* p_buf) {
151 uint8_t* p = ((uint8_t*)(p_buf + 1)) + p_buf->offset;
152
153 /* offset points past the L2CAP header, but the CRC check includes it */
154 p -= L2CAP_PKT_OVERHEAD;
155
156 return (
157 l2c_fcr_updcrc(L2CAP_FCR_INIT_CRC, p, p_buf->len + L2CAP_PKT_OVERHEAD));
158 }
159
160 /*******************************************************************************
161 *
162 * Function l2c_fcr_start_timer
163 *
164 * Description This function starts the (monitor or retransmission) timer.
165 *
166 * Returns -
167 *
168 ******************************************************************************/
l2c_fcr_start_timer(tL2C_CCB * p_ccb)169 void l2c_fcr_start_timer(tL2C_CCB* p_ccb) {
170 CHECK(p_ccb != NULL);
171 uint32_t tout;
172
173 /* The timers which are in milliseconds */
174 if (p_ccb->fcrb.wait_ack) {
175 tout = (uint32_t)p_ccb->our_cfg.fcr.mon_tout;
176 } else {
177 tout = (uint32_t)p_ccb->our_cfg.fcr.rtrans_tout;
178 }
179
180 /* Only start a timer that was not started */
181 if (!alarm_is_scheduled(p_ccb->fcrb.mon_retrans_timer)) {
182 alarm_set_on_mloop(p_ccb->fcrb.mon_retrans_timer, tout,
183 l2c_ccb_timer_timeout, p_ccb);
184 }
185 }
186
187 /*******************************************************************************
188 *
189 * Function l2c_fcr_stop_timer
190 *
191 * Description This function stops the (monitor or transmission) timer.
192 *
193 * Returns -
194 *
195 ******************************************************************************/
l2c_fcr_stop_timer(tL2C_CCB * p_ccb)196 void l2c_fcr_stop_timer(tL2C_CCB* p_ccb) {
197 CHECK(p_ccb != NULL);
198 alarm_cancel(p_ccb->fcrb.mon_retrans_timer);
199 }
200
201 /*******************************************************************************
202 *
203 * Function l2c_fcr_cleanup
204 *
205 * Description This function cleans up the variable used for
206 * flow-control/retrans.
207 *
208 * Returns -
209 *
210 ******************************************************************************/
l2c_fcr_cleanup(tL2C_CCB * p_ccb)211 void l2c_fcr_cleanup(tL2C_CCB* p_ccb) {
212 CHECK(p_ccb != NULL);
213 tL2C_FCRB* p_fcrb = &p_ccb->fcrb;
214
215 alarm_free(p_fcrb->mon_retrans_timer);
216 p_fcrb->mon_retrans_timer = NULL;
217 alarm_free(p_fcrb->ack_timer);
218 p_fcrb->ack_timer = NULL;
219
220 osi_free_and_reset((void**)&p_fcrb->p_rx_sdu);
221
222 fixed_queue_free(p_fcrb->waiting_for_ack_q, osi_free);
223 p_fcrb->waiting_for_ack_q = NULL;
224
225 fixed_queue_free(p_fcrb->srej_rcv_hold_q, osi_free);
226 p_fcrb->srej_rcv_hold_q = NULL;
227
228 fixed_queue_free(p_fcrb->retrans_q, osi_free);
229 p_fcrb->retrans_q = NULL;
230
231 #if (L2CAP_ERTM_STATS == TRUE)
232 if ((p_ccb->local_cid >= L2CAP_BASE_APPL_CID) &&
233 (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE)) {
234 uint32_t dur = time_get_os_boottime_ms() - p_ccb->fcrb.connect_tick_count;
235 size_t p_str_size = 120;
236 char* p_str = (char*)osi_malloc(p_str_size);
237 uint16_t i;
238 uint32_t throughput_avg, ack_delay_avg, ack_q_count_avg;
239
240 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI,
241 TRACE_TYPE_GENERIC,
242 "--- L2CAP ERTM Stats for CID: 0x%04x Duration: %08ums",
243 p_ccb->local_cid, dur);
244 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI,
245 TRACE_TYPE_GENERIC,
246 "Retransmissions:%08u Times Flow Controlled:%08u Retrans "
247 "Touts:%08u Ack Touts:%08u",
248 p_ccb->fcrb.pkts_retransmitted, p_ccb->fcrb.xmit_window_closed,
249 p_ccb->fcrb.retrans_touts, p_ccb->fcrb.xmit_ack_touts);
250 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI,
251 TRACE_TYPE_GENERIC,
252 "Times there is less than 2 packets in controller when flow "
253 "controlled:%08u",
254 p_ccb->fcrb.controller_idle);
255 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI,
256 TRACE_TYPE_GENERIC,
257 "max_held_acks:%08u, in_cfg.fcr.tx_win_sz:%08u",
258 p_ccb->fcrb.max_held_acks, p_ccb->peer_cfg.fcr.tx_win_sz);
259
260 snprintf(
261 p_str, p_str_size,
262 "Sent Pkts:%08u Bytes:%10u(%06u/sec) RR:%08u REJ:%08u RNR:%08u "
263 "SREJ:%08u",
264 p_ccb->fcrb.ertm_pkt_counts[0], p_ccb->fcrb.ertm_byte_counts[0],
265 (dur >= 10 ? (p_ccb->fcrb.ertm_byte_counts[0] * 100) / (dur / 10) : 0),
266 p_ccb->fcrb.s_frames_sent[0], p_ccb->fcrb.s_frames_sent[1],
267 p_ccb->fcrb.s_frames_sent[2], p_ccb->fcrb.s_frames_sent[3]);
268
269 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI,
270 TRACE_TYPE_GENERIC, "%s", p_str);
271
272 snprintf(
273 p_str, p_str_size,
274 "Rcvd Pkts:%08u Bytes:%10u(%06u/sec) RR:%08u REJ:%08u RNR:%08u "
275 "SREJ:%08u",
276 p_ccb->fcrb.ertm_pkt_counts[1], p_ccb->fcrb.ertm_byte_counts[1],
277 (dur >= 10 ? (p_ccb->fcrb.ertm_byte_counts[1] * 100) / (dur / 10) : 0),
278 p_ccb->fcrb.s_frames_rcvd[0], p_ccb->fcrb.s_frames_rcvd[1],
279 p_ccb->fcrb.s_frames_rcvd[2], p_ccb->fcrb.s_frames_rcvd[3]);
280
281 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI,
282 TRACE_TYPE_GENERIC, "%s", p_str);
283
284 throughput_avg = 0;
285 ack_delay_avg = 0;
286 ack_q_count_avg = 0;
287
288 for (i = 0; i < L2CAP_ERTM_STATS_NUM_AVG; i++) {
289 if (i == p_ccb->fcrb.ack_delay_avg_index) {
290 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI,
291 TRACE_TYPE_GENERIC, "[%02u] collecting data ...", i);
292 continue;
293 }
294
295 snprintf(p_str, p_str_size,
296 "[%02u] throughput: %5u, ack_delay avg:%3u, min:%3u, max:%3u, "
297 "ack_q_count avg:%3u, min:%3u, max:%3u",
298 i, p_ccb->fcrb.throughput[i], p_ccb->fcrb.ack_delay_avg[i],
299 p_ccb->fcrb.ack_delay_min[i], p_ccb->fcrb.ack_delay_max[i],
300 p_ccb->fcrb.ack_q_count_avg[i], p_ccb->fcrb.ack_q_count_min[i],
301 p_ccb->fcrb.ack_q_count_max[i]);
302
303 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI,
304 TRACE_TYPE_GENERIC, "%s", p_str);
305
306 throughput_avg += p_ccb->fcrb.throughput[i];
307 ack_delay_avg += p_ccb->fcrb.ack_delay_avg[i];
308 ack_q_count_avg += p_ccb->fcrb.ack_q_count_avg[i];
309 }
310
311 throughput_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1);
312 ack_delay_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1);
313 ack_q_count_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1);
314
315 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI,
316 TRACE_TYPE_GENERIC,
317 "throughput_avg: %8u (kbytes/sec), ack_delay_avg: %8u ms, "
318 "ack_q_count_avg: %8u",
319 throughput_avg, ack_delay_avg, ack_q_count_avg);
320
321 osi_free(p_str);
322
323 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI,
324 TRACE_TYPE_GENERIC, "---");
325 }
326 #endif
327
328 memset(p_fcrb, 0, sizeof(tL2C_FCRB));
329 }
330
331 /*******************************************************************************
332 *
333 * Function l2c_fcr_clone_buf
334 *
335 * Description This function allocates and copies requested part of a
336 * buffer at a new-offset.
337 *
338 * Returns pointer to new buffer
339 *
340 ******************************************************************************/
l2c_fcr_clone_buf(BT_HDR * p_buf,uint16_t new_offset,uint16_t no_of_bytes)341 BT_HDR* l2c_fcr_clone_buf(BT_HDR* p_buf, uint16_t new_offset,
342 uint16_t no_of_bytes) {
343 CHECK(p_buf != NULL);
344 /*
345 * NOTE: We allocate extra L2CAP_FCS_LEN octets, in case we need to put
346 * the FCS (Frame Check Sequence) at the end of the buffer.
347 */
348 uint16_t buf_size = no_of_bytes + sizeof(BT_HDR) + new_offset + L2CAP_FCS_LEN;
349 #if (L2CAP_ERTM_STATS == TRUE)
350 /*
351 * NOTE: If L2CAP_ERTM_STATS is enabled, we need 4 extra octets at the
352 * end for a timestamp at the end of an I-frame.
353 */
354 buf_size += sizeof(uint32_t);
355 #endif
356 BT_HDR* p_buf2 = (BT_HDR*)osi_malloc(buf_size);
357
358 p_buf2->offset = new_offset;
359 p_buf2->len = no_of_bytes;
360 memcpy(((uint8_t*)(p_buf2 + 1)) + p_buf2->offset,
361 ((uint8_t*)(p_buf + 1)) + p_buf->offset, no_of_bytes);
362
363 return (p_buf2);
364 }
365
366 /*******************************************************************************
367 *
368 * Function l2c_fcr_is_flow_controlled
369 *
370 * Description This function checks if the CCB is flow controlled by peer.
371 *
372 * Returns The control word
373 *
374 ******************************************************************************/
l2c_fcr_is_flow_controlled(tL2C_CCB * p_ccb)375 bool l2c_fcr_is_flow_controlled(tL2C_CCB* p_ccb) {
376 CHECK(p_ccb != NULL);
377 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) {
378 /* Check if remote side flowed us off or the transmit window is full */
379 if ((p_ccb->fcrb.remote_busy) ||
380 (fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q) >=
381 p_ccb->peer_cfg.fcr.tx_win_sz)) {
382 #if (L2CAP_ERTM_STATS == TRUE)
383 if (!fixed_queue_is_empty(p_ccb->xmit_hold_q)) {
384 p_ccb->fcrb.xmit_window_closed++;
385
386 if ((p_ccb->p_lcb->sent_not_acked < 2) &&
387 (l2cb.controller_xmit_window > 0))
388 p_ccb->fcrb.controller_idle++;
389 }
390 #endif
391 return (true);
392 }
393 }
394 return (false);
395 }
396
397 /*******************************************************************************
398 *
399 * Function prepare_I_frame
400 *
401 * Description This function sets the FCR variables in an I-frame that is
402 * about to be sent to HCI for transmission. This may be the
403 * first time the I-frame is sent, or a retransmission
404 *
405 * Returns -
406 *
407 ******************************************************************************/
prepare_I_frame(tL2C_CCB * p_ccb,BT_HDR * p_buf,bool is_retransmission)408 static void prepare_I_frame(tL2C_CCB* p_ccb, BT_HDR* p_buf,
409 bool is_retransmission) {
410 CHECK(p_ccb != NULL);
411 CHECK(p_buf != NULL);
412 tL2C_FCRB* p_fcrb = &p_ccb->fcrb;
413 uint8_t* p;
414 uint16_t fcs;
415 uint16_t ctrl_word;
416 bool set_f_bit = p_fcrb->send_f_rsp;
417
418 p_fcrb->send_f_rsp = false;
419
420 if (is_retransmission) {
421 /* Get the old control word and clear out the old req_seq and F bits */
422 p = ((uint8_t*)(p_buf + 1)) + p_buf->offset + L2CAP_PKT_OVERHEAD;
423
424 STREAM_TO_UINT16(ctrl_word, p);
425
426 ctrl_word &= ~(L2CAP_FCR_REQ_SEQ_BITS + L2CAP_FCR_F_BIT);
427 } else {
428 ctrl_word = p_buf->layer_specific & L2CAP_FCR_SEG_BITS; /* SAR bits */
429 ctrl_word |=
430 (p_fcrb->next_tx_seq << L2CAP_FCR_TX_SEQ_BITS_SHIFT); /* Tx Seq */
431
432 p_fcrb->next_tx_seq = (p_fcrb->next_tx_seq + 1) & L2CAP_FCR_SEQ_MODULO;
433 }
434
435 /* Set the F-bit and reqseq only if using re-transmission mode */
436 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) {
437 if (set_f_bit) ctrl_word |= L2CAP_FCR_F_BIT;
438
439 ctrl_word |= (p_fcrb->next_seq_expected) << L2CAP_FCR_REQ_SEQ_BITS_SHIFT;
440
441 p_fcrb->last_ack_sent = p_ccb->fcrb.next_seq_expected;
442
443 alarm_cancel(p_ccb->fcrb.ack_timer);
444 }
445
446 /* Set the control word */
447 p = ((uint8_t*)(p_buf + 1)) + p_buf->offset + L2CAP_PKT_OVERHEAD;
448
449 UINT16_TO_STREAM(p, ctrl_word);
450
451 /* Compute the FCS and add to the end of the buffer if not bypassed */
452 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) {
453 /* length field in l2cap header has to include FCS length */
454 p = ((uint8_t*)(p_buf + 1)) + p_buf->offset;
455 UINT16_TO_STREAM(p, p_buf->len + L2CAP_FCS_LEN - L2CAP_PKT_OVERHEAD);
456
457 /* Calculate the FCS */
458 fcs = l2c_fcr_tx_get_fcs(p_buf);
459
460 /* Point to the end of the buffer and put the FCS there */
461 /*
462 * NOTE: Here we assume the allocated buffer is large enough
463 * to include extra L2CAP_FCS_LEN octets at the end.
464 */
465 p = ((uint8_t*)(p_buf + 1)) + p_buf->offset + p_buf->len;
466
467 UINT16_TO_STREAM(p, fcs);
468
469 p_buf->len += L2CAP_FCS_LEN;
470 }
471
472 if (is_retransmission) {
473 L2CAP_TRACE_EVENT(
474 "L2CAP eRTM ReTx I-frame CID: 0x%04x Len: %u SAR: %s TxSeq: %u "
475 "ReqSeq: %u F: %u",
476 p_ccb->local_cid, p_buf->len,
477 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT],
478 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT,
479 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
480 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
481 } else {
482 L2CAP_TRACE_EVENT(
483 "L2CAP eRTM Tx I-frame CID: 0x%04x Len: %u SAR: %-12s TxSeq: %u "
484 "ReqSeq: %u F: %u",
485 p_ccb->local_cid, p_buf->len,
486 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT],
487 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT,
488 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
489 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
490 }
491
492 /* Start the retransmission timer if not already running */
493 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE)
494 l2c_fcr_start_timer(p_ccb);
495 }
496
497 /*******************************************************************************
498 *
499 * Function l2c_fcr_send_S_frame
500 *
501 * Description This function formats and sends an S-frame for transmission.
502 *
503 * Returns -
504 *
505 ******************************************************************************/
l2c_fcr_send_S_frame(tL2C_CCB * p_ccb,uint16_t function_code,uint16_t pf_bit)506 void l2c_fcr_send_S_frame(tL2C_CCB* p_ccb, uint16_t function_code,
507 uint16_t pf_bit) {
508 CHECK(p_ccb != NULL);
509 uint8_t* p;
510 uint16_t ctrl_word;
511 uint16_t fcs;
512
513 if ((!p_ccb->in_use) || (p_ccb->chnl_state != CST_OPEN)) return;
514
515 #if (L2CAP_ERTM_STATS == TRUE)
516 p_ccb->fcrb.s_frames_sent[function_code]++;
517 #endif
518
519 if (pf_bit == L2CAP_FCR_P_BIT) {
520 p_ccb->fcrb.wait_ack = true;
521
522 l2c_fcr_stop_timer(p_ccb); /* Restart the monitor timer */
523 l2c_fcr_start_timer(p_ccb);
524 }
525
526 /* Create the control word to use */
527 ctrl_word = (function_code << L2CAP_FCR_SUP_SHIFT) | L2CAP_FCR_S_FRAME_BIT;
528 ctrl_word |= (p_ccb->fcrb.next_seq_expected << L2CAP_FCR_REQ_SEQ_BITS_SHIFT);
529 ctrl_word |= pf_bit;
530
531 BT_HDR* p_buf = (BT_HDR*)osi_malloc(L2CAP_CMD_BUF_SIZE);
532 p_buf->offset = HCI_DATA_PREAMBLE_SIZE;
533 p_buf->len = L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD;
534
535 /* Set the pointer to the beginning of the data */
536 p = (uint8_t*)(p_buf + 1) + p_buf->offset;
537
538 /* Put in the L2CAP header */
539 UINT16_TO_STREAM(p, L2CAP_FCR_OVERHEAD + L2CAP_FCS_LEN);
540 UINT16_TO_STREAM(p, p_ccb->remote_cid);
541 UINT16_TO_STREAM(p, ctrl_word);
542
543 /* Compute the FCS and add to the end of the buffer if not bypassed */
544 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) {
545 fcs = l2c_fcr_tx_get_fcs(p_buf);
546
547 UINT16_TO_STREAM(p, fcs);
548 p_buf->len += L2CAP_FCS_LEN;
549 } else {
550 /* rewrite the length without FCS length */
551 p -= 6;
552 UINT16_TO_STREAM(p, L2CAP_FCR_OVERHEAD);
553 }
554
555 /* Now, the HCI transport header */
556 p_buf->layer_specific = L2CAP_NON_FLUSHABLE_PKT;
557 l2cu_set_acl_hci_header(p_buf, p_ccb);
558
559 if ((((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 1) ||
560 (((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 3)) {
561 L2CAP_TRACE_WARNING(
562 "L2CAP eRTM Tx S-frame CID: 0x%04x ctrlword: 0x%04x Type: %s "
563 "ReqSeq: %u P: %u F: %u",
564 p_ccb->local_cid, ctrl_word,
565 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT],
566 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
567 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT,
568 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
569 L2CAP_TRACE_WARNING(" Buf Len: %u", p_buf->len);
570 } else {
571 L2CAP_TRACE_EVENT(
572 "L2CAP eRTM Tx S-frame CID: 0x%04x ctrlword: 0x%04x Type: %s "
573 "ReqSeq: %u P: %u F: %u",
574 p_ccb->local_cid, ctrl_word,
575 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT],
576 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
577 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT,
578 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
579 L2CAP_TRACE_EVENT(" Buf Len: %u", p_buf->len);
580 }
581
582 l2c_link_check_send_pkts(p_ccb->p_lcb, NULL, p_buf);
583
584 p_ccb->fcrb.last_ack_sent = p_ccb->fcrb.next_seq_expected;
585
586 alarm_cancel(p_ccb->fcrb.ack_timer);
587 }
588
589 /*******************************************************************************
590 *
591 * Function l2c_fcr_proc_pdu
592 *
593 * Description This function is the entry point for processing of a
594 * received PDU when in flow control and/or retransmission
595 * modes.
596 *
597 * Returns -
598 *
599 ******************************************************************************/
l2c_fcr_proc_pdu(tL2C_CCB * p_ccb,BT_HDR * p_buf)600 void l2c_fcr_proc_pdu(tL2C_CCB* p_ccb, BT_HDR* p_buf) {
601 CHECK(p_ccb != NULL);
602 CHECK(p_buf != NULL);
603 uint8_t* p;
604 uint16_t fcs;
605 uint16_t min_pdu_len;
606 uint16_t ctrl_word;
607
608 /* Check the length */
609 min_pdu_len = (p_ccb->bypass_fcs == L2CAP_BYPASS_FCS)
610 ? (uint16_t)L2CAP_FCR_OVERHEAD
611 : (uint16_t)(L2CAP_FCS_LEN + L2CAP_FCR_OVERHEAD);
612
613 if (p_buf->len < min_pdu_len) {
614 L2CAP_TRACE_WARNING("Rx L2CAP PDU: CID: 0x%04x Len too short: %u",
615 p_ccb->local_cid, p_buf->len);
616 osi_free(p_buf);
617 return;
618 }
619
620 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_STREAM_MODE) {
621 process_stream_frame(p_ccb, p_buf);
622 return;
623 }
624
625 /* Get the control word */
626 p = ((uint8_t*)(p_buf + 1)) + p_buf->offset;
627 STREAM_TO_UINT16(ctrl_word, p);
628
629 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) {
630 if ((((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 1) ||
631 (((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 3)) {
632 /* REJ or SREJ */
633 L2CAP_TRACE_WARNING(
634 "L2CAP eRTM Rx S-frame: cid: 0x%04x Len: %u Type: %s ReqSeq: %u "
635 "P: %u F: %u",
636 p_ccb->local_cid, p_buf->len,
637 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT],
638 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
639 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT,
640 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
641 } else {
642 L2CAP_TRACE_EVENT(
643 "L2CAP eRTM Rx S-frame: cid: 0x%04x Len: %u Type: %s ReqSeq: %u "
644 "P: %u F: %u",
645 p_ccb->local_cid, p_buf->len,
646 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT],
647 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
648 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT,
649 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
650 }
651 } else {
652 L2CAP_TRACE_EVENT(
653 "L2CAP eRTM Rx I-frame: cid: 0x%04x Len: %u SAR: %-12s TxSeq: %u "
654 "ReqSeq: %u F: %u",
655 p_ccb->local_cid, p_buf->len,
656 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT],
657 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT,
658 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
659 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
660 }
661
662 L2CAP_TRACE_EVENT(
663 " eRTM Rx Nxt_tx_seq %u, Lst_rx_ack %u, Nxt_seq_exp %u, Lst_ack_snt "
664 "%u, wt_q.cnt %u, tries %u",
665 p_ccb->fcrb.next_tx_seq, p_ccb->fcrb.last_rx_ack,
666 p_ccb->fcrb.next_seq_expected, p_ccb->fcrb.last_ack_sent,
667 fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q), p_ccb->fcrb.num_tries);
668
669 /* Verify FCS if using */
670 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) {
671 p = ((uint8_t*)(p_buf + 1)) + p_buf->offset + p_buf->len - L2CAP_FCS_LEN;
672
673 /* Extract and drop the FCS from the packet */
674 STREAM_TO_UINT16(fcs, p);
675 p_buf->len -= L2CAP_FCS_LEN;
676
677 if (l2c_fcr_rx_get_fcs(p_buf) != fcs) {
678 L2CAP_TRACE_WARNING("Rx L2CAP PDU: CID: 0x%04x BAD FCS",
679 p_ccb->local_cid);
680 osi_free(p_buf);
681 return;
682 }
683 }
684
685 /* Get the control word */
686 p = ((uint8_t*)(p_buf + 1)) + p_buf->offset;
687
688 STREAM_TO_UINT16(ctrl_word, p);
689
690 p_buf->len -= L2CAP_FCR_OVERHEAD;
691 p_buf->offset += L2CAP_FCR_OVERHEAD;
692
693 /* If we had a poll bit outstanding, check if we got a final response */
694 if (p_ccb->fcrb.wait_ack) {
695 /* If final bit not set, ignore the frame unless it is a polled S-frame */
696 if (!(ctrl_word & L2CAP_FCR_F_BIT)) {
697 if ((ctrl_word & L2CAP_FCR_P_BIT) &&
698 (ctrl_word & L2CAP_FCR_S_FRAME_BIT)) {
699 if (p_ccb->fcrb.srej_sent)
700 l2c_fcr_send_S_frame(p_ccb, L2CAP_FCR_SUP_SREJ, L2CAP_FCR_F_BIT);
701 else if (p_ccb->fcrb.local_busy)
702 l2c_fcr_send_S_frame(p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_F_BIT);
703 else
704 l2c_fcr_send_S_frame(p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_F_BIT);
705
706 /* Got a poll while in wait_ack state, so re-start our timer with
707 * 1-second */
708 /* This is a small optimization... the monitor timer is 12 secs, but we
709 * saw */
710 /* that if the other side sends us a poll when we are waiting for a
711 * final, */
712 /* then it speeds up recovery significantly if we poll him back soon
713 * after his poll. */
714 alarm_set_on_mloop(p_ccb->fcrb.mon_retrans_timer, BT_1SEC_TIMEOUT_MS,
715 l2c_ccb_timer_timeout, p_ccb);
716 }
717 osi_free(p_buf);
718 return;
719 }
720
721 p_ccb->fcrb.wait_ack = false;
722
723 /* P and F are mutually exclusive */
724 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) ctrl_word &= ~L2CAP_FCR_P_BIT;
725
726 if (fixed_queue_is_empty(p_ccb->fcrb.waiting_for_ack_q))
727 p_ccb->fcrb.num_tries = 0;
728
729 l2c_fcr_stop_timer(p_ccb);
730 } else {
731 /* Otherwise, ensure the final bit is ignored */
732 ctrl_word &= ~L2CAP_FCR_F_BIT;
733 }
734
735 /* Process receive sequence number */
736 if (!process_reqseq(p_ccb, ctrl_word)) {
737 osi_free(p_buf);
738 return;
739 }
740
741 /* Process based on whether it is an S-frame or an I-frame */
742 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT)
743 process_s_frame(p_ccb, p_buf, ctrl_word);
744 else
745 process_i_frame(p_ccb, p_buf, ctrl_word, false);
746
747 /* Return if the channel got disconnected by a bad packet or max
748 * retransmissions */
749 if ((!p_ccb->in_use) || (p_ccb->chnl_state != CST_OPEN)) return;
750
751 /* If we have some buffers held while doing SREJ, and SREJ has cleared,
752 * process them now */
753 if ((!p_ccb->fcrb.local_busy) && (!p_ccb->fcrb.srej_sent) &&
754 (!fixed_queue_is_empty(p_ccb->fcrb.srej_rcv_hold_q))) {
755 fixed_queue_t* temp_q = p_ccb->fcrb.srej_rcv_hold_q;
756 p_ccb->fcrb.srej_rcv_hold_q = fixed_queue_new(SIZE_MAX);
757
758 while ((p_buf = (BT_HDR*)fixed_queue_try_dequeue(temp_q)) != NULL) {
759 if (p_ccb->in_use && (p_ccb->chnl_state == CST_OPEN)) {
760 /* Get the control word */
761 p = ((uint8_t*)(p_buf + 1)) + p_buf->offset - L2CAP_FCR_OVERHEAD;
762
763 STREAM_TO_UINT16(ctrl_word, p);
764
765 L2CAP_TRACE_DEBUG(
766 "l2c_fcr_proc_pdu() CID: 0x%04x Process Buffer from SREJ_Hold_Q "
767 "TxSeq: %u Expected_Seq: %u",
768 p_ccb->local_cid,
769 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT,
770 p_ccb->fcrb.next_seq_expected);
771
772 /* Process the SREJ held I-frame, but do not send an RR for each
773 * individual frame */
774 process_i_frame(p_ccb, p_buf, ctrl_word, true);
775 } else
776 osi_free(p_buf);
777
778 /* If more frames were lost during SREJ, send a REJ */
779 if (p_ccb->fcrb.rej_after_srej) {
780 p_ccb->fcrb.rej_after_srej = false;
781 p_ccb->fcrb.rej_sent = true;
782
783 l2c_fcr_send_S_frame(p_ccb, L2CAP_FCR_SUP_REJ, 0);
784 }
785 }
786 fixed_queue_free(temp_q, NULL);
787
788 /* Now, if needed, send one RR for the whole held queue */
789 if ((!p_ccb->fcrb.local_busy) && (!p_ccb->fcrb.rej_sent) &&
790 (!p_ccb->fcrb.srej_sent) &&
791 (p_ccb->fcrb.next_seq_expected != p_ccb->fcrb.last_ack_sent))
792 l2c_fcr_send_S_frame(p_ccb, L2CAP_FCR_SUP_RR, 0);
793 else {
794 L2CAP_TRACE_DEBUG(
795 "l2c_fcr_proc_pdu() not sending RR CID: 0x%04x local_busy:%d "
796 "rej_sent:%d srej_sent:%d Expected_Seq:%u Last_Ack:%u",
797 p_ccb->local_cid, p_ccb->fcrb.local_busy, p_ccb->fcrb.rej_sent,
798 p_ccb->fcrb.srej_sent, p_ccb->fcrb.next_seq_expected,
799 p_ccb->fcrb.last_ack_sent);
800 }
801 }
802
803 /* If a window has opened, check if we can send any more packets */
804 if ((!fixed_queue_is_empty(p_ccb->fcrb.retrans_q) ||
805 !fixed_queue_is_empty(p_ccb->xmit_hold_q)) &&
806 (!p_ccb->fcrb.wait_ack) && (!l2c_fcr_is_flow_controlled(p_ccb))) {
807 l2c_link_check_send_pkts(p_ccb->p_lcb, NULL, NULL);
808 }
809 }
810
811 /*******************************************************************************
812 *
813 * Function l2c_lcc_proc_pdu
814 *
815 * Description This function is the entry point for processing of a
816 * received PDU when in LE Coc flow control modes.
817 *
818 * Returns -
819 *
820 ******************************************************************************/
l2c_lcc_proc_pdu(tL2C_CCB * p_ccb,BT_HDR * p_buf)821 void l2c_lcc_proc_pdu(tL2C_CCB* p_ccb, BT_HDR* p_buf) {
822 CHECK(p_ccb != NULL);
823 CHECK(p_buf != NULL);
824 uint8_t* p = (uint8_t*)(p_buf + 1) + p_buf->offset;
825 uint16_t sdu_length;
826 BT_HDR* p_data = NULL;
827
828 /* Buffer length should not exceed local mps */
829 if (p_buf->len > p_ccb->local_conn_cfg.mps) {
830 /* Discard the buffer */
831 osi_free(p_buf);
832 return;
833 }
834
835 if (p_ccb->is_first_seg) {
836 STREAM_TO_UINT16(sdu_length, p);
837 /* Check the SDU Length with local MTU size */
838 if (sdu_length > p_ccb->local_conn_cfg.mtu) {
839 /* Discard the buffer */
840 osi_free(p_buf);
841 return;
842 }
843
844 p_data = (BT_HDR*)osi_malloc(BT_HDR_SIZE + sdu_length);
845 if (p_data == NULL) {
846 osi_free(p_buf);
847 return;
848 }
849
850 p_ccb->ble_sdu = p_data;
851 p_data->len = 0;
852 p_ccb->ble_sdu_length = sdu_length;
853 L2CAP_TRACE_DEBUG("%s SDU Length = %d", __func__, sdu_length);
854 p_buf->len -= sizeof(sdu_length);
855 p_buf->offset += sizeof(sdu_length);
856 p_data->offset = 0;
857
858 } else {
859 p_data = p_ccb->ble_sdu;
860 if (p_buf->len > (p_ccb->ble_sdu_length - p_data->len)) {
861 L2CAP_TRACE_ERROR("%s: buffer length=%d too big. max=%d. Dropped",
862 __func__, p_data->len,
863 (p_ccb->ble_sdu_length - p_data->len));
864 android_errorWriteWithInfoLog(0x534e4554, "75298652", -1, NULL, 0);
865 osi_free(p_buf);
866
867 /* Throw away all pending fragments and disconnects */
868 p_ccb->is_first_seg = true;
869 osi_free(p_ccb->ble_sdu);
870 p_ccb->ble_sdu = NULL;
871 p_ccb->ble_sdu_length = 0;
872 l2cu_disconnect_chnl(p_ccb);
873 return;
874 }
875 }
876
877 memcpy((uint8_t*)(p_data + 1) + p_data->offset + p_data->len,
878 (uint8_t*)(p_buf + 1) + p_buf->offset, p_buf->len);
879 p_data->len += p_buf->len;
880 p = (uint8_t*)(p_data + 1) + p_data->offset;
881 if (p_data->len == p_ccb->ble_sdu_length) {
882 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_DATA, p_data);
883 p_ccb->is_first_seg = true;
884 p_ccb->ble_sdu = NULL;
885 p_ccb->ble_sdu_length = 0;
886 } else if (p_data->len < p_ccb->ble_sdu_length) {
887 p_ccb->is_first_seg = false;
888 }
889
890 osi_free(p_buf);
891 return;
892 }
893
894 /*******************************************************************************
895 *
896 * Function l2c_fcr_proc_tout
897 *
898 * Description Handle a timeout. We should be in error recovery state.
899 *
900 * Returns -
901 *
902 ******************************************************************************/
l2c_fcr_proc_tout(tL2C_CCB * p_ccb)903 void l2c_fcr_proc_tout(tL2C_CCB* p_ccb) {
904 CHECK(p_ccb != NULL);
905 L2CAP_TRACE_DEBUG(
906 "l2c_fcr_proc_tout: CID: 0x%04x num_tries: %u (max: %u) wait_ack: %u "
907 "ack_q_count: %u",
908 p_ccb->local_cid, p_ccb->fcrb.num_tries, p_ccb->peer_cfg.fcr.max_transmit,
909 p_ccb->fcrb.wait_ack, fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q));
910
911 #if (L2CAP_ERTM_STATS == TRUE)
912 p_ccb->fcrb.retrans_touts++;
913 #endif
914
915 if ((p_ccb->peer_cfg.fcr.max_transmit != 0) &&
916 (++p_ccb->fcrb.num_tries > p_ccb->peer_cfg.fcr.max_transmit)) {
917 l2cu_disconnect_chnl(p_ccb);
918 } else {
919 if (!p_ccb->fcrb.srej_sent && !p_ccb->fcrb.rej_sent) {
920 if (p_ccb->fcrb.local_busy)
921 l2c_fcr_send_S_frame(p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_P_BIT);
922 else
923 l2c_fcr_send_S_frame(p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_P_BIT);
924 }
925 }
926 }
927
928 /*******************************************************************************
929 *
930 * Function l2c_fcr_proc_ack_tout
931 *
932 * Description Send RR/RNR if we have not acked I frame
933 *
934 * Returns -
935 *
936 ******************************************************************************/
l2c_fcr_proc_ack_tout(tL2C_CCB * p_ccb)937 void l2c_fcr_proc_ack_tout(tL2C_CCB* p_ccb) {
938 CHECK(p_ccb != NULL);
939 L2CAP_TRACE_DEBUG(
940 "l2c_fcr_proc_ack_tout: CID: 0x%04x State: %u Wack:%u Rq:%d Acked:%d",
941 p_ccb->local_cid, p_ccb->chnl_state, p_ccb->fcrb.wait_ack,
942 p_ccb->fcrb.next_seq_expected, p_ccb->fcrb.last_ack_sent);
943
944 if ((p_ccb->chnl_state == CST_OPEN) && (!p_ccb->fcrb.wait_ack) &&
945 (p_ccb->fcrb.last_ack_sent != p_ccb->fcrb.next_seq_expected)) {
946 #if (L2CAP_ERTM_STATS == TRUE)
947 p_ccb->fcrb.xmit_ack_touts++;
948 #endif
949 if (p_ccb->fcrb.local_busy)
950 l2c_fcr_send_S_frame(p_ccb, L2CAP_FCR_SUP_RNR, 0);
951 else
952 l2c_fcr_send_S_frame(p_ccb, L2CAP_FCR_SUP_RR, 0);
953 }
954 }
955
956 /*******************************************************************************
957 *
958 * Function process_reqseq
959 *
960 * Description Handle receive sequence number
961 *
962 * Returns -
963 *
964 ******************************************************************************/
process_reqseq(tL2C_CCB * p_ccb,uint16_t ctrl_word)965 static bool process_reqseq(tL2C_CCB* p_ccb, uint16_t ctrl_word) {
966 CHECK(p_ccb != NULL);
967 tL2C_FCRB* p_fcrb = &p_ccb->fcrb;
968 uint8_t req_seq, num_bufs_acked, xx;
969 uint16_t ls;
970 uint16_t full_sdus_xmitted;
971
972 /* Receive sequence number does not ack anything for SREJ with P-bit set to
973 * zero */
974 if ((ctrl_word & L2CAP_FCR_S_FRAME_BIT) &&
975 ((ctrl_word & L2CAP_FCR_SUP_BITS) ==
976 (L2CAP_FCR_SUP_SREJ << L2CAP_FCR_SUP_SHIFT)) &&
977 ((ctrl_word & L2CAP_FCR_P_BIT) == 0)) {
978 /* If anything still waiting for ack, restart the timer if it was stopped */
979 if (!fixed_queue_is_empty(p_fcrb->waiting_for_ack_q))
980 l2c_fcr_start_timer(p_ccb);
981
982 return (true);
983 }
984
985 /* Extract the receive sequence number from the control word */
986 req_seq =
987 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT;
988
989 num_bufs_acked = (req_seq - p_fcrb->last_rx_ack) & L2CAP_FCR_SEQ_MODULO;
990
991 /* Verify the request sequence is in range before proceeding */
992 if (num_bufs_acked > fixed_queue_length(p_fcrb->waiting_for_ack_q)) {
993 /* The channel is closed if ReqSeq is not in range */
994 L2CAP_TRACE_WARNING(
995 "L2CAP eRTM Frame BAD Req_Seq - ctrl_word: 0x%04x req_seq 0x%02x "
996 "last_rx_ack: 0x%02x QCount: %u",
997 ctrl_word, req_seq, p_fcrb->last_rx_ack,
998 fixed_queue_length(p_fcrb->waiting_for_ack_q));
999
1000 l2cu_disconnect_chnl(p_ccb);
1001 return (false);
1002 }
1003
1004 p_fcrb->last_rx_ack = req_seq;
1005
1006 /* Now we can release all acknowledged frames, and restart the retransmission
1007 * timer if needed */
1008 if (num_bufs_acked != 0) {
1009 p_fcrb->num_tries = 0;
1010 full_sdus_xmitted = 0;
1011
1012 #if (L2CAP_ERTM_STATS == TRUE)
1013 l2c_fcr_collect_ack_delay(p_ccb, num_bufs_acked);
1014 #endif
1015
1016 for (xx = 0; xx < num_bufs_acked; xx++) {
1017 BT_HDR* p_tmp =
1018 (BT_HDR*)fixed_queue_try_dequeue(p_fcrb->waiting_for_ack_q);
1019 ls = p_tmp->layer_specific & L2CAP_FCR_SAR_BITS;
1020
1021 if ((ls == L2CAP_FCR_UNSEG_SDU) || (ls == L2CAP_FCR_END_SDU))
1022 full_sdus_xmitted++;
1023
1024 osi_free(p_tmp);
1025 }
1026
1027 /* If we are still in a wait_ack state, do not mess with the timer */
1028 if (!p_ccb->fcrb.wait_ack) l2c_fcr_stop_timer(p_ccb);
1029
1030 /* Check if we need to call the "packet_sent" callback */
1031 if ((p_ccb->p_rcb) && (p_ccb->p_rcb->api.pL2CA_TxComplete_Cb) &&
1032 (full_sdus_xmitted)) {
1033 /* Special case for eRTM, if all packets sent, send 0xFFFF */
1034 if (fixed_queue_is_empty(p_fcrb->waiting_for_ack_q) &&
1035 fixed_queue_is_empty(p_ccb->xmit_hold_q)) {
1036 full_sdus_xmitted = 0xFFFF;
1037 }
1038
1039 (*p_ccb->p_rcb->api.pL2CA_TxComplete_Cb)(p_ccb->local_cid,
1040 full_sdus_xmitted);
1041 }
1042 }
1043
1044 /* If anything still waiting for ack, restart the timer if it was stopped */
1045 if (!fixed_queue_is_empty(p_fcrb->waiting_for_ack_q))
1046 l2c_fcr_start_timer(p_ccb);
1047 return (true);
1048 }
1049
1050 /*******************************************************************************
1051 *
1052 * Function process_s_frame
1053 *
1054 * Description Process an S frame
1055 *
1056 * Returns -
1057 *
1058 ******************************************************************************/
process_s_frame(tL2C_CCB * p_ccb,BT_HDR * p_buf,uint16_t ctrl_word)1059 static void process_s_frame(tL2C_CCB* p_ccb, BT_HDR* p_buf,
1060 uint16_t ctrl_word) {
1061 CHECK(p_ccb != NULL);
1062 CHECK(p_buf != NULL);
1063
1064 tL2C_FCRB* p_fcrb = &p_ccb->fcrb;
1065 uint16_t s_frame_type =
1066 (ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT;
1067 bool remote_was_busy;
1068 bool all_ok = true;
1069
1070 if (p_buf->len != 0) {
1071 L2CAP_TRACE_WARNING("Incorrect S-frame Length (%d)", p_buf->len);
1072 }
1073
1074 L2CAP_TRACE_DEBUG("process_s_frame ctrl_word 0x%04x fcrb_remote_busy:%d",
1075 ctrl_word, p_fcrb->remote_busy);
1076
1077 #if (L2CAP_ERTM_STATS == TRUE)
1078 p_ccb->fcrb.s_frames_rcvd[s_frame_type]++;
1079 #endif
1080
1081 if (ctrl_word & L2CAP_FCR_P_BIT) {
1082 p_fcrb->rej_sent = false; /* After checkpoint, we can send anoher REJ */
1083 p_fcrb->send_f_rsp = true; /* Set a flag in case an I-frame is pending */
1084 }
1085
1086 switch (s_frame_type) {
1087 case L2CAP_FCR_SUP_RR:
1088 remote_was_busy = p_fcrb->remote_busy;
1089 p_fcrb->remote_busy = false;
1090
1091 if ((ctrl_word & L2CAP_FCR_F_BIT) || (remote_was_busy))
1092 all_ok = retransmit_i_frames(p_ccb, L2C_FCR_RETX_ALL_PKTS);
1093 break;
1094
1095 case L2CAP_FCR_SUP_REJ:
1096 p_fcrb->remote_busy = false;
1097 all_ok = retransmit_i_frames(p_ccb, L2C_FCR_RETX_ALL_PKTS);
1098 break;
1099
1100 case L2CAP_FCR_SUP_RNR:
1101 p_fcrb->remote_busy = true;
1102 l2c_fcr_stop_timer(p_ccb);
1103 break;
1104
1105 case L2CAP_FCR_SUP_SREJ:
1106 p_fcrb->remote_busy = false;
1107 all_ok = retransmit_i_frames(
1108 p_ccb, (uint8_t)((ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >>
1109 L2CAP_FCR_REQ_SEQ_BITS_SHIFT));
1110 break;
1111 }
1112
1113 if (all_ok) {
1114 /* If polled, we need to respond with F-bit. Note, we may have sent a
1115 * I-frame with the F-bit */
1116 if (p_fcrb->send_f_rsp) {
1117 if (p_fcrb->srej_sent)
1118 l2c_fcr_send_S_frame(p_ccb, L2CAP_FCR_SUP_SREJ, L2CAP_FCR_F_BIT);
1119 else if (p_fcrb->local_busy)
1120 l2c_fcr_send_S_frame(p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_F_BIT);
1121 else
1122 l2c_fcr_send_S_frame(p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_F_BIT);
1123
1124 p_fcrb->send_f_rsp = false;
1125 }
1126 } else {
1127 L2CAP_TRACE_DEBUG("process_s_frame hit_max_retries");
1128 }
1129
1130 osi_free(p_buf);
1131 }
1132
1133 /*******************************************************************************
1134 *
1135 * Function process_i_frame
1136 *
1137 * Description Process an I frame
1138 *
1139 * Returns -
1140 *
1141 ******************************************************************************/
process_i_frame(tL2C_CCB * p_ccb,BT_HDR * p_buf,uint16_t ctrl_word,bool delay_ack)1142 static void process_i_frame(tL2C_CCB* p_ccb, BT_HDR* p_buf, uint16_t ctrl_word,
1143 bool delay_ack) {
1144 CHECK(p_ccb != NULL);
1145 CHECK(p_buf != NULL);
1146
1147 tL2C_FCRB* p_fcrb = &p_ccb->fcrb;
1148 uint8_t tx_seq, num_lost, num_to_ack, next_srej;
1149
1150 /* If we were doing checkpoint recovery, first retransmit all unacked I-frames
1151 */
1152 if (ctrl_word & L2CAP_FCR_F_BIT) {
1153 if (!retransmit_i_frames(p_ccb, L2C_FCR_RETX_ALL_PKTS)) {
1154 osi_free(p_buf);
1155 return;
1156 }
1157 }
1158
1159 #if (L2CAP_ERTM_STATS == TRUE)
1160 p_ccb->fcrb.ertm_pkt_counts[1]++;
1161 p_ccb->fcrb.ertm_byte_counts[1] += p_buf->len;
1162 #endif
1163
1164 /* Extract the sequence number */
1165 tx_seq = (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT;
1166
1167 /* If we have flow controlled the peer, ignore any bad I-frames from him */
1168 if ((tx_seq != p_fcrb->next_seq_expected) && (p_fcrb->local_busy)) {
1169 L2CAP_TRACE_WARNING("Dropping bad I-Frame since we flowed off, tx_seq:%u",
1170 tx_seq);
1171 l2c_fcr_send_S_frame(p_ccb, L2CAP_FCR_SUP_RNR, 0);
1172 osi_free(p_buf);
1173 return;
1174 }
1175
1176 /* Check if tx-sequence is the expected one */
1177 if (tx_seq != p_fcrb->next_seq_expected) {
1178 num_lost = (tx_seq - p_fcrb->next_seq_expected) & L2CAP_FCR_SEQ_MODULO;
1179
1180 /* Is the frame a duplicate ? If so, just drop it */
1181 if (num_lost >= p_ccb->our_cfg.fcr.tx_win_sz) {
1182 /* Duplicate - simply drop it */
1183 L2CAP_TRACE_WARNING(
1184 "process_i_frame() Dropping Duplicate Frame tx_seq:%u ExpectedTxSeq "
1185 "%u",
1186 tx_seq, p_fcrb->next_seq_expected);
1187 osi_free(p_buf);
1188 } else {
1189 L2CAP_TRACE_WARNING(
1190 "process_i_frame() CID: 0x%04x Lost: %u tx_seq:%u ExpTxSeq %u "
1191 "Rej: %u SRej: %u",
1192 p_ccb->local_cid, num_lost, tx_seq, p_fcrb->next_seq_expected,
1193 p_fcrb->rej_sent, p_fcrb->srej_sent);
1194
1195 if (p_fcrb->srej_sent) {
1196 /* If SREJ sent, save the frame for later processing as long as it is in
1197 * sequence */
1198 next_srej =
1199 (((BT_HDR*)fixed_queue_try_peek_last(p_fcrb->srej_rcv_hold_q))
1200 ->layer_specific +
1201 1) &
1202 L2CAP_FCR_SEQ_MODULO;
1203
1204 if ((tx_seq == next_srej) &&
1205 (fixed_queue_length(p_fcrb->srej_rcv_hold_q) <
1206 p_ccb->our_cfg.fcr.tx_win_sz)) {
1207 /* If user gave us a pool for held rx buffers, use that */
1208 /* TODO: Could that happen? Get rid of this code. */
1209 if (p_ccb->ertm_info.fcr_rx_buf_size != L2CAP_FCR_RX_BUF_SIZE) {
1210 BT_HDR* p_buf2;
1211
1212 /* Adjust offset and len so that control word is copied */
1213 p_buf->offset -= L2CAP_FCR_OVERHEAD;
1214 p_buf->len += L2CAP_FCR_OVERHEAD;
1215
1216 p_buf2 = l2c_fcr_clone_buf(p_buf, p_buf->offset, p_buf->len);
1217
1218 if (p_buf2) {
1219 osi_free(p_buf);
1220 p_buf = p_buf2;
1221 }
1222 p_buf->offset += L2CAP_FCR_OVERHEAD;
1223 p_buf->len -= L2CAP_FCR_OVERHEAD;
1224 }
1225 L2CAP_TRACE_DEBUG(
1226 "process_i_frame() Lost: %u tx_seq:%u ExpTxSeq %u Rej: %u "
1227 "SRej1",
1228 num_lost, tx_seq, p_fcrb->next_seq_expected, p_fcrb->rej_sent);
1229
1230 p_buf->layer_specific = tx_seq;
1231 fixed_queue_enqueue(p_fcrb->srej_rcv_hold_q, p_buf);
1232 } else {
1233 L2CAP_TRACE_WARNING(
1234 "process_i_frame() CID: 0x%04x frame dropped in Srej Sent "
1235 "next_srej:%u hold_q.count:%u win_sz:%u",
1236 p_ccb->local_cid, next_srej,
1237 fixed_queue_length(p_fcrb->srej_rcv_hold_q),
1238 p_ccb->our_cfg.fcr.tx_win_sz);
1239
1240 p_fcrb->rej_after_srej = true;
1241 osi_free(p_buf);
1242 }
1243 } else if (p_fcrb->rej_sent) {
1244 L2CAP_TRACE_WARNING(
1245 "process_i_frame() CID: 0x%04x Lost: %u tx_seq:%u ExpTxSeq %u "
1246 "Rej: 1 SRej: %u",
1247 p_ccb->local_cid, num_lost, tx_seq, p_fcrb->next_seq_expected,
1248 p_fcrb->srej_sent);
1249
1250 /* If REJ sent, just drop the frame */
1251 osi_free(p_buf);
1252 } else {
1253 L2CAP_TRACE_DEBUG(
1254 "process_i_frame() CID: 0x%04x tx_seq:%u ExpTxSeq %u Rej: %u",
1255 p_ccb->local_cid, tx_seq, p_fcrb->next_seq_expected,
1256 p_fcrb->rej_sent);
1257
1258 /* If only one lost, we will send SREJ, otherwise we will send REJ */
1259 if (num_lost > 1) {
1260 osi_free(p_buf);
1261 p_fcrb->rej_sent = true;
1262 l2c_fcr_send_S_frame(p_ccb, L2CAP_FCR_SUP_REJ, 0);
1263 } else {
1264 if (!fixed_queue_is_empty(p_fcrb->srej_rcv_hold_q)) {
1265 L2CAP_TRACE_ERROR(
1266 "process_i_frame() CID: 0x%04x sending SREJ tx_seq:%d "
1267 "hold_q.count:%u",
1268 p_ccb->local_cid, tx_seq,
1269 fixed_queue_length(p_fcrb->srej_rcv_hold_q));
1270 }
1271 p_buf->layer_specific = tx_seq;
1272 fixed_queue_enqueue(p_fcrb->srej_rcv_hold_q, p_buf);
1273 p_fcrb->srej_sent = true;
1274 l2c_fcr_send_S_frame(p_ccb, L2CAP_FCR_SUP_SREJ, 0);
1275 }
1276 alarm_cancel(p_ccb->fcrb.ack_timer);
1277 }
1278 }
1279 return;
1280 }
1281
1282 /* Seq number is the next expected. Clear possible reject exception in case it
1283 * occured */
1284 p_fcrb->rej_sent = p_fcrb->srej_sent = false;
1285
1286 /* Adjust the next_seq, so that if the upper layer sends more data in the
1287 callback
1288 context, the received frame is acked by an I-frame. */
1289 p_fcrb->next_seq_expected = (tx_seq + 1) & L2CAP_FCR_SEQ_MODULO;
1290
1291 /* If any SAR problem in eRTM mode, spec says disconnect. */
1292 if (!do_sar_reassembly(p_ccb, p_buf, ctrl_word)) {
1293 L2CAP_TRACE_WARNING("process_i_frame() CID: 0x%04x reassembly failed",
1294 p_ccb->local_cid);
1295 l2cu_disconnect_chnl(p_ccb);
1296 return;
1297 }
1298
1299 /* RR optimization - if peer can still send us more, then start an ACK timer
1300 */
1301 num_to_ack = (p_fcrb->next_seq_expected - p_fcrb->last_ack_sent) &
1302 L2CAP_FCR_SEQ_MODULO;
1303
1304 if ((num_to_ack < p_ccb->fcrb.max_held_acks) && (!p_fcrb->local_busy))
1305 delay_ack = true;
1306
1307 /* We should neve never ack frame if we are not in OPEN state */
1308 if ((num_to_ack != 0) && p_ccb->in_use && (p_ccb->chnl_state == CST_OPEN)) {
1309 /* If no frames are awaiting transmission or are held, send an RR or RNR
1310 * S-frame for ack */
1311 if (delay_ack) {
1312 /* If it is the first I frame we did not ack, start ack timer */
1313 if (!alarm_is_scheduled(p_ccb->fcrb.ack_timer)) {
1314 alarm_set_on_mloop(p_ccb->fcrb.ack_timer, L2CAP_FCR_ACK_TIMEOUT_MS,
1315 l2c_fcrb_ack_timer_timeout, p_ccb);
1316 }
1317 } else if ((fixed_queue_is_empty(p_ccb->xmit_hold_q) ||
1318 l2c_fcr_is_flow_controlled(p_ccb)) &&
1319 fixed_queue_is_empty(p_ccb->fcrb.srej_rcv_hold_q)) {
1320 if (p_fcrb->local_busy)
1321 l2c_fcr_send_S_frame(p_ccb, L2CAP_FCR_SUP_RNR, 0);
1322 else
1323 l2c_fcr_send_S_frame(p_ccb, L2CAP_FCR_SUP_RR, 0);
1324 }
1325 }
1326 }
1327
1328 /*******************************************************************************
1329 *
1330 * Function process_stream_frame
1331 *
1332 * Description This function processes frames in streaming mode
1333 *
1334 * Returns -
1335 *
1336 ******************************************************************************/
process_stream_frame(tL2C_CCB * p_ccb,BT_HDR * p_buf)1337 static void process_stream_frame(tL2C_CCB* p_ccb, BT_HDR* p_buf) {
1338 CHECK(p_ccb != NULL);
1339 CHECK(p_buf != NULL);
1340
1341 uint16_t ctrl_word;
1342 uint16_t fcs;
1343 uint8_t* p;
1344 uint8_t tx_seq;
1345
1346 /* Verify FCS if using */
1347 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) {
1348 p = ((uint8_t*)(p_buf + 1)) + p_buf->offset + p_buf->len - L2CAP_FCS_LEN;
1349
1350 /* Extract and drop the FCS from the packet */
1351 STREAM_TO_UINT16(fcs, p);
1352 p_buf->len -= L2CAP_FCS_LEN;
1353
1354 if (l2c_fcr_rx_get_fcs(p_buf) != fcs) {
1355 L2CAP_TRACE_WARNING("Rx L2CAP PDU: CID: 0x%04x BAD FCS",
1356 p_ccb->local_cid);
1357 osi_free(p_buf);
1358 return;
1359 }
1360 }
1361
1362 /* Get the control word */
1363 p = ((uint8_t*)(p_buf + 1)) + p_buf->offset;
1364
1365 STREAM_TO_UINT16(ctrl_word, p);
1366
1367 p_buf->len -= L2CAP_FCR_OVERHEAD;
1368 p_buf->offset += L2CAP_FCR_OVERHEAD;
1369
1370 /* Make sure it is an I-frame */
1371 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) {
1372 L2CAP_TRACE_WARNING(
1373 "Rx L2CAP PDU: CID: 0x%04x BAD S-frame in streaming mode ctrl_word: "
1374 "0x%04x",
1375 p_ccb->local_cid, ctrl_word);
1376 osi_free(p_buf);
1377 return;
1378 }
1379
1380 L2CAP_TRACE_EVENT(
1381 "L2CAP eRTM Rx I-frame: cid: 0x%04x Len: %u SAR: %-12s TxSeq: %u "
1382 "ReqSeq: %u F: %u",
1383 p_ccb->local_cid, p_buf->len,
1384 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT],
1385 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT,
1386 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
1387 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
1388
1389 /* Extract the sequence number */
1390 tx_seq = (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT;
1391
1392 /* Check if tx-sequence is the expected one */
1393 if (tx_seq != p_ccb->fcrb.next_seq_expected) {
1394 L2CAP_TRACE_WARNING(
1395 "Rx L2CAP PDU: CID: 0x%04x Lost frames Exp: %u Got: %u p_rx_sdu: "
1396 "0x%08x",
1397 p_ccb->local_cid, p_ccb->fcrb.next_seq_expected, tx_seq,
1398 p_ccb->fcrb.p_rx_sdu);
1399
1400 /* Lost one or more packets, so flush the SAR queue */
1401 osi_free_and_reset((void**)&p_ccb->fcrb.p_rx_sdu);
1402 }
1403
1404 p_ccb->fcrb.next_seq_expected = (tx_seq + 1) & L2CAP_FCR_SEQ_MODULO;
1405
1406 if (!do_sar_reassembly(p_ccb, p_buf, ctrl_word)) {
1407 /* Some sort of SAR error, so flush the SAR queue */
1408 osi_free_and_reset((void**)&p_ccb->fcrb.p_rx_sdu);
1409 }
1410 }
1411
1412 /*******************************************************************************
1413 *
1414 * Function do_sar_reassembly
1415 *
1416 * Description Process SAR bits and re-assemble frame
1417 *
1418 * Returns true if all OK, else false
1419 *
1420 ******************************************************************************/
do_sar_reassembly(tL2C_CCB * p_ccb,BT_HDR * p_buf,uint16_t ctrl_word)1421 static bool do_sar_reassembly(tL2C_CCB* p_ccb, BT_HDR* p_buf,
1422 uint16_t ctrl_word) {
1423 CHECK(p_ccb != NULL);
1424 CHECK(p_buf != NULL);
1425
1426 tL2C_FCRB* p_fcrb = &p_ccb->fcrb;
1427 uint16_t sar_type = ctrl_word & L2CAP_FCR_SEG_BITS;
1428 bool packet_ok = true;
1429 uint8_t* p;
1430
1431 /* Check if the SAR state is correct */
1432 if ((sar_type == L2CAP_FCR_UNSEG_SDU) || (sar_type == L2CAP_FCR_START_SDU)) {
1433 if (p_fcrb->p_rx_sdu != NULL) {
1434 L2CAP_TRACE_WARNING(
1435 "SAR - got unexpected unsegmented or start SDU Expected len: %u "
1436 "Got so far: %u",
1437 p_fcrb->rx_sdu_len, p_fcrb->p_rx_sdu->len);
1438
1439 packet_ok = false;
1440 }
1441 /* Check the length of the packet */
1442 if ((sar_type == L2CAP_FCR_START_SDU) &&
1443 (p_buf->len < L2CAP_SDU_LEN_OVERHEAD)) {
1444 L2CAP_TRACE_WARNING("SAR start packet too short: %u", p_buf->len);
1445 packet_ok = false;
1446 }
1447 } else {
1448 if (p_fcrb->p_rx_sdu == NULL) {
1449 L2CAP_TRACE_WARNING("SAR - got unexpected cont or end SDU");
1450 packet_ok = false;
1451 }
1452 }
1453
1454 if ((packet_ok) && (sar_type != L2CAP_FCR_UNSEG_SDU)) {
1455 p = ((uint8_t*)(p_buf + 1)) + p_buf->offset;
1456
1457 /* For start SDU packet, extract the SDU length */
1458 if (sar_type == L2CAP_FCR_START_SDU) {
1459 /* Get the SDU length */
1460 STREAM_TO_UINT16(p_fcrb->rx_sdu_len, p);
1461 p_buf->offset += 2;
1462 p_buf->len -= 2;
1463
1464 if (p_fcrb->rx_sdu_len > p_ccb->max_rx_mtu) {
1465 L2CAP_TRACE_WARNING("SAR - SDU len: %u larger than MTU: %u",
1466 p_fcrb->rx_sdu_len, p_fcrb->rx_sdu_len);
1467 packet_ok = false;
1468 } else {
1469 p_fcrb->p_rx_sdu = (BT_HDR*)osi_malloc(
1470 BT_HDR_SIZE + OBX_BUF_MIN_OFFSET + p_fcrb->rx_sdu_len);
1471 p_fcrb->p_rx_sdu->offset = OBX_BUF_MIN_OFFSET;
1472 p_fcrb->p_rx_sdu->len = 0;
1473 }
1474 }
1475
1476 if (packet_ok) {
1477 if ((p_fcrb->p_rx_sdu->len + p_buf->len) > p_fcrb->rx_sdu_len) {
1478 L2CAP_TRACE_ERROR(
1479 "SAR - SDU len exceeded Type: %u Lengths: %u %u %u", sar_type,
1480 p_fcrb->p_rx_sdu->len, p_buf->len, p_fcrb->rx_sdu_len);
1481 packet_ok = false;
1482 } else if ((sar_type == L2CAP_FCR_END_SDU) &&
1483 ((p_fcrb->p_rx_sdu->len + p_buf->len) != p_fcrb->rx_sdu_len)) {
1484 L2CAP_TRACE_WARNING("SAR - SDU end rcvd but SDU incomplete: %u %u %u",
1485 p_fcrb->p_rx_sdu->len, p_buf->len,
1486 p_fcrb->rx_sdu_len);
1487 packet_ok = false;
1488 } else {
1489 memcpy(((uint8_t*)(p_fcrb->p_rx_sdu + 1)) + p_fcrb->p_rx_sdu->offset +
1490 p_fcrb->p_rx_sdu->len,
1491 p, p_buf->len);
1492
1493 p_fcrb->p_rx_sdu->len += p_buf->len;
1494
1495 osi_free(p_buf);
1496 p_buf = NULL;
1497
1498 if (sar_type == L2CAP_FCR_END_SDU) {
1499 p_buf = p_fcrb->p_rx_sdu;
1500 p_fcrb->p_rx_sdu = NULL;
1501 }
1502 }
1503 }
1504 }
1505
1506 if (!packet_ok) {
1507 osi_free(p_buf);
1508 } else if (p_buf != NULL) {
1509 #if (L2CAP_NUM_FIXED_CHNLS > 0)
1510 if (p_ccb->local_cid < L2CAP_BASE_APPL_CID &&
1511 (p_ccb->local_cid >= L2CAP_FIRST_FIXED_CHNL &&
1512 p_ccb->local_cid <= L2CAP_LAST_FIXED_CHNL)) {
1513 if (l2cb.fixed_reg[p_ccb->local_cid - L2CAP_FIRST_FIXED_CHNL]
1514 .pL2CA_FixedData_Cb)
1515 (*l2cb.fixed_reg[p_ccb->local_cid - L2CAP_FIRST_FIXED_CHNL]
1516 .pL2CA_FixedData_Cb)(p_ccb->local_cid,
1517 p_ccb->p_lcb->remote_bd_addr, p_buf);
1518 } else
1519 #endif
1520 l2c_csm_execute(p_ccb, L2CEVT_L2CAP_DATA, p_buf);
1521 }
1522
1523 return (packet_ok);
1524 }
1525
1526 /*******************************************************************************
1527 *
1528 * Function retransmit_i_frames
1529 *
1530 * Description This function retransmits i-frames awaiting acks.
1531 *
1532 * Returns bool - true if retransmitted
1533 *
1534 ******************************************************************************/
retransmit_i_frames(tL2C_CCB * p_ccb,uint8_t tx_seq)1535 static bool retransmit_i_frames(tL2C_CCB* p_ccb, uint8_t tx_seq) {
1536 CHECK(p_ccb != NULL);
1537
1538 BT_HDR* p_buf = NULL;
1539 uint8_t* p;
1540 uint8_t buf_seq;
1541 uint16_t ctrl_word;
1542
1543 if ((!fixed_queue_is_empty(p_ccb->fcrb.waiting_for_ack_q)) &&
1544 (p_ccb->peer_cfg.fcr.max_transmit != 0) &&
1545 (p_ccb->fcrb.num_tries >= p_ccb->peer_cfg.fcr.max_transmit)) {
1546 L2CAP_TRACE_EVENT(
1547 "Max Tries Exceeded: (last_acq: %d CID: 0x%04x num_tries: %u (max: "
1548 "%u) ack_q_count: %u",
1549 p_ccb->fcrb.last_rx_ack, p_ccb->local_cid, p_ccb->fcrb.num_tries,
1550 p_ccb->peer_cfg.fcr.max_transmit,
1551 fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q));
1552
1553 l2cu_disconnect_chnl(p_ccb);
1554 return (false);
1555 }
1556
1557 /* tx_seq indicates whether to retransmit a specific sequence or all (if ==
1558 * L2C_FCR_RETX_ALL_PKTS) */
1559 list_t* list_ack = NULL;
1560 const list_node_t* node_ack = NULL;
1561 if (!fixed_queue_is_empty(p_ccb->fcrb.waiting_for_ack_q)) {
1562 list_ack = fixed_queue_get_list(p_ccb->fcrb.waiting_for_ack_q);
1563 node_ack = list_begin(list_ack);
1564 }
1565 if (tx_seq != L2C_FCR_RETX_ALL_PKTS) {
1566 /* If sending only one, the sequence number tells us which one. Look for it.
1567 */
1568 if (list_ack != NULL) {
1569 for (; node_ack != list_end(list_ack); node_ack = list_next(node_ack)) {
1570 p_buf = (BT_HDR*)list_node(node_ack);
1571 /* Get the old control word */
1572 p = ((uint8_t*)(p_buf + 1)) + p_buf->offset + L2CAP_PKT_OVERHEAD;
1573
1574 STREAM_TO_UINT16(ctrl_word, p);
1575
1576 buf_seq =
1577 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT;
1578
1579 L2CAP_TRACE_DEBUG(
1580 "retransmit_i_frames() cur seq: %u looking for: %u", buf_seq,
1581 tx_seq);
1582
1583 if (tx_seq == buf_seq) break;
1584 }
1585 }
1586
1587 if (!p_buf) {
1588 L2CAP_TRACE_ERROR("retransmit_i_frames() UNKNOWN seq: %u q_count: %u",
1589 tx_seq,
1590 fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q));
1591 return (true);
1592 }
1593 } else {
1594 // Iterate though list and flush the amount requested from
1595 // the transmit data queue that satisfy the layer and event conditions.
1596 for (list_node_t* node_tmp = list_begin(p_ccb->p_lcb->link_xmit_data_q);
1597 node_tmp != list_end(p_ccb->p_lcb->link_xmit_data_q);) {
1598 BT_HDR* p_tmp = (BT_HDR*)list_node(node_tmp);
1599 node_tmp = list_next(node_tmp);
1600
1601 /* Do not flush other CIDs or partial segments */
1602 if ((p_tmp->layer_specific == 0) && (p_tmp->event == p_ccb->local_cid)) {
1603 list_remove(p_ccb->p_lcb->link_xmit_data_q, p_tmp);
1604 osi_free(p_tmp);
1605 }
1606 }
1607
1608 /* Also flush our retransmission queue */
1609 while (!fixed_queue_is_empty(p_ccb->fcrb.retrans_q))
1610 osi_free(fixed_queue_try_dequeue(p_ccb->fcrb.retrans_q));
1611
1612 if (list_ack != NULL) node_ack = list_begin(list_ack);
1613 }
1614
1615 if (list_ack != NULL) {
1616 while (node_ack != list_end(list_ack)) {
1617 p_buf = (BT_HDR*)list_node(node_ack);
1618 node_ack = list_next(node_ack);
1619
1620 BT_HDR* p_buf2 = l2c_fcr_clone_buf(p_buf, p_buf->offset, p_buf->len);
1621 if (p_buf2) {
1622 p_buf2->layer_specific = p_buf->layer_specific;
1623
1624 fixed_queue_enqueue(p_ccb->fcrb.retrans_q, p_buf2);
1625 }
1626
1627 if ((tx_seq != L2C_FCR_RETX_ALL_PKTS) || (p_buf2 == NULL)) break;
1628 }
1629 }
1630
1631 l2c_link_check_send_pkts(p_ccb->p_lcb, NULL, NULL);
1632
1633 if (fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q)) {
1634 p_ccb->fcrb.num_tries++;
1635 l2c_fcr_start_timer(p_ccb);
1636 }
1637
1638 return (true);
1639 }
1640
1641 /*******************************************************************************
1642 *
1643 * Function l2c_fcr_get_next_xmit_sdu_seg
1644 *
1645 * Description Get the next SDU segment to transmit.
1646 *
1647 * Returns pointer to buffer with segment or NULL
1648 *
1649 ******************************************************************************/
l2c_fcr_get_next_xmit_sdu_seg(tL2C_CCB * p_ccb,uint16_t max_packet_length)1650 BT_HDR* l2c_fcr_get_next_xmit_sdu_seg(tL2C_CCB* p_ccb,
1651 uint16_t max_packet_length) {
1652 CHECK(p_ccb != NULL);
1653
1654 bool first_seg = false, /* The segment is the first part of data */
1655 mid_seg = false, /* The segment is the middle part of data */
1656 last_seg = false; /* The segment is the last part of data */
1657 uint16_t sdu_len = 0;
1658 BT_HDR *p_buf, *p_xmit;
1659 uint8_t* p;
1660 uint16_t max_pdu = p_ccb->tx_mps /* Needed? - L2CAP_MAX_HEADER_FCS*/;
1661
1662 /* If there is anything in the retransmit queue, that goes first
1663 */
1664 p_buf = (BT_HDR*)fixed_queue_try_dequeue(p_ccb->fcrb.retrans_q);
1665 if (p_buf != NULL) {
1666 /* Update Rx Seq and FCS if we acked some packets while this one was queued
1667 */
1668 prepare_I_frame(p_ccb, p_buf, true);
1669
1670 p_buf->event = p_ccb->local_cid;
1671
1672 #if (L2CAP_ERTM_STATS == TRUE)
1673 p_ccb->fcrb.pkts_retransmitted++;
1674 p_ccb->fcrb.ertm_pkt_counts[0]++;
1675 p_ccb->fcrb.ertm_byte_counts[0] += (p_buf->len - 8);
1676 #endif
1677 return (p_buf);
1678 }
1679
1680 /* For BD/EDR controller, max_packet_length is set to 0 */
1681 /* For AMP controller, max_packet_length is set by available blocks */
1682 if ((max_packet_length > L2CAP_MAX_HEADER_FCS) &&
1683 (max_pdu + L2CAP_MAX_HEADER_FCS > max_packet_length)) {
1684 max_pdu = max_packet_length - L2CAP_MAX_HEADER_FCS;
1685 }
1686
1687 p_buf = (BT_HDR*)fixed_queue_try_peek_first(p_ccb->xmit_hold_q);
1688
1689 /* If there is more data than the MPS, it requires segmentation */
1690 if (p_buf->len > max_pdu) {
1691 /* We are using the "event" field to tell is if we already started
1692 * segmentation */
1693 if (p_buf->event == 0) {
1694 first_seg = true;
1695 sdu_len = p_buf->len;
1696 } else
1697 mid_seg = true;
1698
1699 /* Get a new buffer and copy the data that can be sent in a PDU */
1700 p_xmit = l2c_fcr_clone_buf(p_buf, L2CAP_MIN_OFFSET + L2CAP_SDU_LEN_OFFSET,
1701 max_pdu);
1702
1703 if (p_xmit != NULL) {
1704 p_buf->event = p_ccb->local_cid;
1705 p_xmit->event = p_ccb->local_cid;
1706
1707 p_buf->len -= max_pdu;
1708 p_buf->offset += max_pdu;
1709
1710 /* copy PBF setting */
1711 p_xmit->layer_specific = p_buf->layer_specific;
1712 } else /* Should never happen if the application has configured buffers
1713 correctly */
1714 {
1715 L2CAP_TRACE_ERROR(
1716 "L2CAP - cannot get buffer for segmentation, max_pdu: %u", max_pdu);
1717 return (NULL);
1718 }
1719 } else /* Use the original buffer if no segmentation, or the last segment */
1720 {
1721 p_xmit = (BT_HDR*)fixed_queue_try_dequeue(p_ccb->xmit_hold_q);
1722
1723 if (p_xmit->event != 0) last_seg = true;
1724
1725 p_xmit->event = p_ccb->local_cid;
1726 }
1727
1728 /* Step back to add the L2CAP headers */
1729 p_xmit->offset -= (L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD);
1730 p_xmit->len += L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD;
1731
1732 if (first_seg) {
1733 p_xmit->offset -= L2CAP_SDU_LEN_OVERHEAD;
1734 p_xmit->len += L2CAP_SDU_LEN_OVERHEAD;
1735 }
1736
1737 /* Set the pointer to the beginning of the data */
1738 p = (uint8_t*)(p_xmit + 1) + p_xmit->offset;
1739
1740 /* Now the L2CAP header */
1741
1742 /* Note: if FCS has to be included then the length is recalculated later */
1743 UINT16_TO_STREAM(p, p_xmit->len - L2CAP_PKT_OVERHEAD);
1744
1745 UINT16_TO_STREAM(p, p_ccb->remote_cid);
1746
1747 if (first_seg) {
1748 /* Skip control word and add SDU length */
1749 p += 2;
1750 UINT16_TO_STREAM(p, sdu_len);
1751
1752 /* We will store the SAR type in layer-specific */
1753 /* layer_specific is shared with flushable flag(bits 0-1), don't clear it */
1754 p_xmit->layer_specific |= L2CAP_FCR_START_SDU;
1755
1756 first_seg = false;
1757 } else if (mid_seg)
1758 p_xmit->layer_specific |= L2CAP_FCR_CONT_SDU;
1759 else if (last_seg)
1760 p_xmit->layer_specific |= L2CAP_FCR_END_SDU;
1761 else
1762 p_xmit->layer_specific |= L2CAP_FCR_UNSEG_SDU;
1763
1764 prepare_I_frame(p_ccb, p_xmit, false);
1765
1766 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) {
1767 BT_HDR* p_wack =
1768 l2c_fcr_clone_buf(p_xmit, HCI_DATA_PREAMBLE_SIZE, p_xmit->len);
1769
1770 if (!p_wack) {
1771 L2CAP_TRACE_ERROR(
1772 "L2CAP - no buffer for xmit cloning, CID: 0x%04x Length: %u",
1773 p_ccb->local_cid, p_xmit->len);
1774
1775 /* We will not save the FCS in case we reconfigure and change options */
1776 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) p_xmit->len -= L2CAP_FCS_LEN;
1777
1778 /* Pretend we sent it and it got lost */
1779 fixed_queue_enqueue(p_ccb->fcrb.waiting_for_ack_q, p_xmit);
1780 return (NULL);
1781 } else {
1782 #if (L2CAP_ERTM_STATS == TRUE)
1783 /* set timestamp at the end of tx I-frame to get acking delay */
1784 /*
1785 * NOTE: Here we assume the allocate buffer is large enough
1786 * to include extra 4 octets at the end.
1787 */
1788 p = ((uint8_t*)(p_wack + 1)) + p_wack->offset + p_wack->len;
1789 UINT32_TO_STREAM(p, time_get_os_boottime_ms());
1790 #endif
1791 /* We will not save the FCS in case we reconfigure and change options */
1792 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) p_wack->len -= L2CAP_FCS_LEN;
1793
1794 p_wack->layer_specific = p_xmit->layer_specific;
1795 fixed_queue_enqueue(p_ccb->fcrb.waiting_for_ack_q, p_wack);
1796 }
1797
1798 #if (L2CAP_ERTM_STATS == TRUE)
1799 p_ccb->fcrb.ertm_pkt_counts[0]++;
1800 p_ccb->fcrb.ertm_byte_counts[0] += (p_xmit->len - 8);
1801 #endif
1802 }
1803
1804 return (p_xmit);
1805 }
1806
1807 /** Get the next PDU to transmit for LE connection oriented channel. Returns
1808 * pointer to buffer with PDU. |last_piece_of_sdu| will be set to true, if
1809 * returned PDU is last piece from this SDU.*/
l2c_lcc_get_next_xmit_sdu_seg(tL2C_CCB * p_ccb,bool * last_piece_of_sdu)1810 BT_HDR* l2c_lcc_get_next_xmit_sdu_seg(tL2C_CCB* p_ccb,
1811 bool* last_piece_of_sdu) {
1812 uint16_t max_pdu = p_ccb->peer_conn_cfg.mps - 4 /* Length and CID */;
1813
1814 BT_HDR* p_buf = (BT_HDR*)fixed_queue_try_peek_first(p_ccb->xmit_hold_q);
1815 bool first_pdu = (p_buf->event == 0) ? true : false;
1816
1817 uint16_t no_of_bytes_to_send = std::min(
1818 p_buf->len,
1819 (uint16_t)(first_pdu ? (max_pdu - L2CAP_LCC_SDU_LENGTH) : max_pdu));
1820 bool last_pdu = (no_of_bytes_to_send == p_buf->len);
1821
1822 /* Get a new buffer and copy the data that can be sent in a PDU */
1823 BT_HDR* p_xmit =
1824 l2c_fcr_clone_buf(p_buf, first_pdu ? L2CAP_LCC_OFFSET : L2CAP_MIN_OFFSET,
1825 no_of_bytes_to_send);
1826
1827 p_buf->event = p_ccb->local_cid;
1828 p_xmit->event = p_ccb->local_cid;
1829
1830 if (first_pdu) {
1831 p_xmit->offset -= L2CAP_LCC_SDU_LENGTH; /* for writing the SDU length. */
1832 uint8_t* p = (uint8_t*)(p_xmit + 1) + p_xmit->offset;
1833 UINT16_TO_STREAM(p, p_buf->len);
1834 p_xmit->len += L2CAP_LCC_SDU_LENGTH;
1835 }
1836
1837 p_buf->len -= no_of_bytes_to_send;
1838 p_buf->offset += no_of_bytes_to_send;
1839
1840 /* copy PBF setting */
1841 p_xmit->layer_specific = p_buf->layer_specific;
1842
1843 if (last_piece_of_sdu) *last_piece_of_sdu = last_pdu;
1844
1845 if (last_pdu) {
1846 p_buf = (BT_HDR*)fixed_queue_try_dequeue(p_ccb->xmit_hold_q);
1847 osi_free(p_buf);
1848 }
1849
1850 /* Step back to add the L2CAP headers */
1851 p_xmit->offset -= L2CAP_PKT_OVERHEAD;
1852 p_xmit->len += L2CAP_PKT_OVERHEAD;
1853
1854 /* Set the pointer to the beginning of the data */
1855 uint8_t* p = (uint8_t*)(p_xmit + 1) + p_xmit->offset;
1856
1857 /* Note: if FCS has to be included then the length is recalculated later */
1858 UINT16_TO_STREAM(p, p_xmit->len - L2CAP_PKT_OVERHEAD);
1859 UINT16_TO_STREAM(p, p_ccb->remote_cid);
1860 return (p_xmit);
1861 }
1862
1863 /*******************************************************************************
1864 * Configuration negotiation functions
1865 *
1866 * The following functions are used in negotiating channel modes during
1867 * configuration
1868 ******************************************************************************/
1869
1870 /*******************************************************************************
1871 *
1872 * Function l2c_fcr_chk_chan_modes
1873 *
1874 * Description Validates and adjusts if necessary, the FCR options
1875 * based on remote EXT features.
1876 *
1877 * Note: This assumes peer EXT Features have been received.
1878 * Basic mode is used if FCR Options have not been received
1879 *
1880 * Returns uint8_t - nonzero if can continue, '0' if no compatible
1881 * channels
1882 *
1883 ******************************************************************************/
l2c_fcr_chk_chan_modes(tL2C_CCB * p_ccb)1884 uint8_t l2c_fcr_chk_chan_modes(tL2C_CCB* p_ccb) {
1885 CHECK(p_ccb != NULL);
1886
1887 /* Remove nonbasic options that the peer does not support */
1888 if (!(p_ccb->p_lcb->peer_ext_fea & L2CAP_EXTFEA_ENH_RETRANS))
1889 p_ccb->ertm_info.allowed_modes &= ~L2CAP_FCR_CHAN_OPT_ERTM;
1890
1891 if (!(p_ccb->p_lcb->peer_ext_fea & L2CAP_EXTFEA_STREAM_MODE))
1892 p_ccb->ertm_info.allowed_modes &= ~L2CAP_FCR_CHAN_OPT_STREAM;
1893
1894 /* At least one type needs to be set (Basic, ERTM, STM) to continue */
1895 if (!p_ccb->ertm_info.allowed_modes) {
1896 L2CAP_TRACE_WARNING(
1897 "L2CAP - Peer does not support our desired channel types");
1898 }
1899
1900 return (p_ccb->ertm_info.allowed_modes);
1901 }
1902
1903 /*******************************************************************************
1904 *
1905 * Function l2c_fcr_adj_our_req_options
1906 *
1907 * Description Validates and sets up the FCR options passed in from
1908 * L2CA_ConfigReq based on remote device's features.
1909 *
1910 * Returns true if no errors, Otherwise false
1911 *
1912 ******************************************************************************/
l2c_fcr_adj_our_req_options(tL2C_CCB * p_ccb,tL2CAP_CFG_INFO * p_cfg)1913 bool l2c_fcr_adj_our_req_options(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg) {
1914 CHECK(p_ccb != NULL);
1915 CHECK(p_cfg != NULL);
1916
1917 tL2CAP_FCR_OPTS* p_fcr = &p_cfg->fcr;
1918
1919 if (p_fcr->mode != p_ccb->ertm_info.preferred_mode) {
1920 L2CAP_TRACE_WARNING(
1921 "l2c_fcr_adj_our_req_options - preferred_mode (%d), does not match "
1922 "mode (%d)",
1923 p_ccb->ertm_info.preferred_mode, p_fcr->mode);
1924
1925 /* The preferred mode is passed in through tL2CAP_ERTM_INFO, so override
1926 * this one */
1927 p_fcr->mode = p_ccb->ertm_info.preferred_mode;
1928 }
1929
1930 /* If upper layer did not request eRTM mode, BASIC must be used */
1931 if (p_ccb->ertm_info.allowed_modes == L2CAP_FCR_CHAN_OPT_BASIC) {
1932 if (p_cfg->fcr_present && p_fcr->mode != L2CAP_FCR_BASIC_MODE) {
1933 L2CAP_TRACE_WARNING(
1934 "l2c_fcr_adj_our_req_options (mode %d): ERROR: No FCR options set "
1935 "using BASIC mode",
1936 p_fcr->mode);
1937 }
1938 p_fcr->mode = L2CAP_FCR_BASIC_MODE;
1939 }
1940
1941 /* Process the FCR options if initial channel bring-up (not a reconfig
1942 *request)
1943 ** Determine initial channel mode to try based on our options and remote's
1944 *features
1945 */
1946 if (p_cfg->fcr_present && !(p_ccb->config_done & RECONFIG_FLAG)) {
1947 /* We need to have at least one mode type common with the peer */
1948 if (!l2c_fcr_chk_chan_modes(p_ccb)) {
1949 /* Two channels have incompatible supported types */
1950 l2cu_disconnect_chnl(p_ccb);
1951 return (false);
1952 }
1953
1954 /* Basic is the only common channel mode between the two devices */
1955 else if (p_ccb->ertm_info.allowed_modes == L2CAP_FCR_CHAN_OPT_BASIC) {
1956 /* We only want to try Basic, so bypass sending the FCR options entirely
1957 */
1958 p_cfg->fcr_present = false;
1959 p_cfg->fcs_present = false; /* Illegal to use FCS option in basic mode */
1960 p_cfg->ext_flow_spec_present =
1961 false; /* Illegal to use extended flow spec in basic mode */
1962 }
1963
1964 /* We have at least one non-basic mode available
1965 * Override mode from available mode options based on preference, if needed
1966 */
1967 else {
1968 /* If peer does not support STREAMING, try ERTM */
1969 if (p_fcr->mode == L2CAP_FCR_STREAM_MODE &&
1970 !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_STREAM)) {
1971 L2CAP_TRACE_DEBUG(
1972 "L2C CFG: mode is STREAM, but peer does not support; Try ERTM");
1973 p_fcr->mode = L2CAP_FCR_ERTM_MODE;
1974 }
1975
1976 /* If peer does not support ERTM, try BASIC (will support this if made it
1977 * here in the code) */
1978 if (p_fcr->mode == L2CAP_FCR_ERTM_MODE &&
1979 !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM)) {
1980 L2CAP_TRACE_DEBUG(
1981 "L2C CFG: mode is ERTM, but peer does not support; Try BASIC");
1982 p_fcr->mode = L2CAP_FCR_BASIC_MODE;
1983 }
1984 }
1985
1986 if (p_fcr->mode != L2CAP_FCR_BASIC_MODE) {
1987 /* MTU must be smaller than buffer size */
1988 if ((p_cfg->mtu_present) && (p_cfg->mtu > p_ccb->max_rx_mtu)) {
1989 L2CAP_TRACE_WARNING("L2CAP - MTU: %u larger than buf size: %u",
1990 p_cfg->mtu, p_ccb->max_rx_mtu);
1991 return (false);
1992 }
1993
1994 /* application want to use the default MPS */
1995 if (p_fcr->mps == L2CAP_DEFAULT_ERM_MPS) {
1996 p_fcr->mps = L2CAP_MPS_OVER_BR_EDR;
1997 }
1998 /* MPS must be less than MTU */
1999 else if (p_fcr->mps > p_ccb->max_rx_mtu) {
2000 L2CAP_TRACE_WARNING("L2CAP - MPS %u invalid MTU: %u", p_fcr->mps,
2001 p_ccb->max_rx_mtu);
2002 return (false);
2003 }
2004
2005 /* We always initially read into the HCI buffer pool, so make sure it fits
2006 */
2007 if (p_fcr->mps > (L2CAP_MTU_SIZE - L2CAP_MAX_HEADER_FCS))
2008 p_fcr->mps = L2CAP_MTU_SIZE - L2CAP_MAX_HEADER_FCS;
2009 } else {
2010 p_cfg->fcs_present = false; /* Illegal to use FCS option in basic mode */
2011 p_cfg->ext_flow_spec_present =
2012 false; /* Illegal to use extended flow spec in basic mode */
2013 }
2014
2015 p_ccb->our_cfg.fcr = *p_fcr;
2016 } else /* Not sure how to send a reconfiguration(??) should fcr be included?
2017 */
2018 {
2019 p_ccb->our_cfg.fcr_present = false;
2020 }
2021
2022 return (true);
2023 }
2024
2025 /*******************************************************************************
2026 *
2027 * Function l2c_fcr_adj_monitor_retran_timeout
2028 *
2029 * Description Overrides monitor/retrans timer value based on controller
2030 *
2031 * Returns None
2032 *
2033 ******************************************************************************/
l2c_fcr_adj_monitor_retran_timeout(tL2C_CCB * p_ccb)2034 void l2c_fcr_adj_monitor_retran_timeout(tL2C_CCB* p_ccb) {
2035 CHECK(p_ccb != NULL);
2036
2037 /* adjust our monitor/retran timeout */
2038 if (p_ccb->out_cfg_fcr_present) {
2039 /*
2040 ** if we requestd ERTM or accepted ERTM
2041 ** We may accept ERTM even if we didn't request ERTM, in case of requesting
2042 *STREAM
2043 */
2044 if ((p_ccb->our_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) ||
2045 (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE)) {
2046 /* upper layer setting is ignored */
2047 p_ccb->our_cfg.fcr.mon_tout = L2CAP_MIN_MONITOR_TOUT;
2048 p_ccb->our_cfg.fcr.rtrans_tout = L2CAP_MIN_RETRANS_TOUT;
2049 } else {
2050 p_ccb->our_cfg.fcr.mon_tout = 0;
2051 p_ccb->our_cfg.fcr.rtrans_tout = 0;
2052 }
2053
2054 L2CAP_TRACE_DEBUG(
2055 "l2c_fcr_adj_monitor_retran_timeout: mon_tout:%d, rtrans_tout:%d",
2056 p_ccb->our_cfg.fcr.mon_tout, p_ccb->our_cfg.fcr.rtrans_tout);
2057 }
2058 }
2059 /*******************************************************************************
2060 *
2061 * Function l2c_fcr_adj_our_rsp_options
2062 *
2063 * Description Overrides any neccesary FCR options passed in from
2064 * L2CA_ConfigRsp based on our FCR options.
2065 * Only makes adjustments if channel is in ERTM mode.
2066 *
2067 * Returns None
2068 *
2069 ******************************************************************************/
l2c_fcr_adj_our_rsp_options(tL2C_CCB * p_ccb,tL2CAP_CFG_INFO * p_cfg)2070 void l2c_fcr_adj_our_rsp_options(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg) {
2071 CHECK(p_ccb != NULL);
2072 CHECK(p_cfg != NULL);
2073
2074 /* adjust our monitor/retran timeout */
2075 l2c_fcr_adj_monitor_retran_timeout(p_ccb);
2076
2077 p_cfg->fcr_present = p_ccb->out_cfg_fcr_present;
2078
2079 if (p_cfg->fcr_present) {
2080 /* Temporary - until a better algorithm is implemented */
2081 /* If peer's tx_wnd_sz requires too many buffers for us to support, then
2082 * adjust it. For now, respond with our own tx_wnd_sz. */
2083 /* Note: peer is not guaranteed to obey our adjustment */
2084 if (p_ccb->peer_cfg.fcr.tx_win_sz > p_ccb->our_cfg.fcr.tx_win_sz) {
2085 L2CAP_TRACE_DEBUG("%s: adjusting requested tx_win_sz from %i to %i",
2086 __func__, p_ccb->peer_cfg.fcr.tx_win_sz,
2087 p_ccb->our_cfg.fcr.tx_win_sz);
2088 p_ccb->peer_cfg.fcr.tx_win_sz = p_ccb->our_cfg.fcr.tx_win_sz;
2089 }
2090
2091 p_cfg->fcr.mode = p_ccb->peer_cfg.fcr.mode;
2092 p_cfg->fcr.tx_win_sz = p_ccb->peer_cfg.fcr.tx_win_sz;
2093 p_cfg->fcr.max_transmit = p_ccb->peer_cfg.fcr.max_transmit;
2094 p_cfg->fcr.mps = p_ccb->peer_cfg.fcr.mps;
2095 p_cfg->fcr.rtrans_tout = p_ccb->our_cfg.fcr.rtrans_tout;
2096 p_cfg->fcr.mon_tout = p_ccb->our_cfg.fcr.mon_tout;
2097 }
2098 }
2099
2100 /*******************************************************************************
2101 *
2102 * Function l2c_fcr_renegotiate_chan
2103 *
2104 * Description Called upon unsuccessful peer response to config request.
2105 * If the error is because of the channel mode, it will try
2106 * to resend using another supported optional channel.
2107 *
2108 * Returns true if resent configuration, False if channel matches or
2109 * cannot match.
2110 *
2111 ******************************************************************************/
l2c_fcr_renegotiate_chan(tL2C_CCB * p_ccb,tL2CAP_CFG_INFO * p_cfg)2112 bool l2c_fcr_renegotiate_chan(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg) {
2113 CHECK(p_ccb != NULL);
2114 CHECK(p_cfg != NULL);
2115
2116 uint8_t peer_mode = p_ccb->our_cfg.fcr.mode;
2117 bool can_renegotiate;
2118
2119 /* Skip if this is a reconfiguration from OPEN STATE or if FCR is not returned
2120 */
2121 if (!p_cfg->fcr_present || (p_ccb->config_done & RECONFIG_FLAG))
2122 return (false);
2123
2124 /* Only retry if there are more channel options to try */
2125 if (p_cfg->result == L2CAP_CFG_UNACCEPTABLE_PARAMS) {
2126 peer_mode = (p_cfg->fcr_present) ? p_cfg->fcr.mode : L2CAP_FCR_BASIC_MODE;
2127
2128 if (p_ccb->our_cfg.fcr.mode != peer_mode) {
2129 if ((--p_ccb->fcr_cfg_tries) == 0) {
2130 p_cfg->result = L2CAP_CFG_FAILED_NO_REASON;
2131 L2CAP_TRACE_WARNING("l2c_fcr_renegotiate_chan (Max retries exceeded)");
2132 }
2133
2134 can_renegotiate = false;
2135
2136 /* Try another supported mode if available based on our last attempted
2137 * channel */
2138 switch (p_ccb->our_cfg.fcr.mode) {
2139 /* Our Streaming mode request was unnacceptable; try ERTM or Basic */
2140 case L2CAP_FCR_STREAM_MODE:
2141 /* Peer wants ERTM and we support it */
2142 if ((peer_mode == L2CAP_FCR_ERTM_MODE) &&
2143 (p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM)) {
2144 L2CAP_TRACE_DEBUG("l2c_fcr_renegotiate_chan(Trying ERTM)");
2145 p_ccb->our_cfg.fcr.mode = L2CAP_FCR_ERTM_MODE;
2146 can_renegotiate = true;
2147 } else /* Falls through */
2148
2149 case L2CAP_FCR_ERTM_MODE: {
2150 /* We can try basic for any other peer mode if we support it */
2151 if (p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_BASIC) {
2152 L2CAP_TRACE_DEBUG("l2c_fcr_renegotiate_chan(Trying Basic)");
2153 can_renegotiate = true;
2154 p_ccb->our_cfg.fcr.mode = L2CAP_FCR_BASIC_MODE;
2155 }
2156 } break;
2157
2158 default:
2159 /* All other scenarios cannot be renegotiated */
2160 break;
2161 }
2162
2163 if (can_renegotiate) {
2164 p_ccb->our_cfg.fcr_present = true;
2165
2166 if (p_ccb->our_cfg.fcr.mode == L2CAP_FCR_BASIC_MODE) {
2167 p_ccb->our_cfg.fcs_present = false;
2168 p_ccb->our_cfg.ext_flow_spec_present = false;
2169
2170 /* Basic Mode uses ACL Data Pool, make sure the MTU fits */
2171 if ((p_cfg->mtu_present) && (p_cfg->mtu > L2CAP_MTU_SIZE)) {
2172 L2CAP_TRACE_WARNING("L2CAP - adjust MTU: %u too large", p_cfg->mtu);
2173 p_cfg->mtu = L2CAP_MTU_SIZE;
2174 }
2175 }
2176
2177 l2cu_process_our_cfg_req(p_ccb, &p_ccb->our_cfg);
2178 l2cu_send_peer_config_req(p_ccb, &p_ccb->our_cfg);
2179 alarm_set_on_mloop(p_ccb->l2c_ccb_timer, L2CAP_CHNL_CFG_TIMEOUT_MS,
2180 l2c_ccb_timer_timeout, p_ccb);
2181 return (true);
2182 }
2183 }
2184 }
2185
2186 /* Disconnect if the channels do not match */
2187 if (p_ccb->our_cfg.fcr.mode != peer_mode) {
2188 L2CAP_TRACE_WARNING("L2C CFG: Channels incompatible (local %d, peer %d)",
2189 p_ccb->our_cfg.fcr.mode, peer_mode);
2190 l2cu_disconnect_chnl(p_ccb);
2191 }
2192
2193 return (false);
2194 }
2195
2196 /*******************************************************************************
2197 *
2198 * Function l2c_fcr_process_peer_cfg_req
2199 *
2200 * Description This function is called to process the FCR options passed
2201 * in the peer's configuration request.
2202 *
2203 * Returns uint8_t - L2CAP_PEER_CFG_OK, L2CAP_PEER_CFG_UNACCEPTABLE,
2204 * or L2CAP_PEER_CFG_DISCONNECT.
2205 *
2206 ******************************************************************************/
l2c_fcr_process_peer_cfg_req(tL2C_CCB * p_ccb,tL2CAP_CFG_INFO * p_cfg)2207 uint8_t l2c_fcr_process_peer_cfg_req(tL2C_CCB* p_ccb, tL2CAP_CFG_INFO* p_cfg) {
2208 CHECK(p_ccb != NULL);
2209 CHECK(p_cfg != NULL);
2210
2211 uint16_t max_retrans_size;
2212 uint8_t fcr_ok = L2CAP_PEER_CFG_OK;
2213
2214 p_ccb->p_lcb->w4_info_rsp =
2215 false; /* Handles T61x SonyEricsson Bug in Info Request */
2216
2217 L2CAP_TRACE_EVENT(
2218 "l2c_fcr_process_peer_cfg_req() CFG fcr_present:%d fcr.mode:%d CCB FCR "
2219 "mode:%d preferred: %u allowed:%u",
2220 p_cfg->fcr_present, p_cfg->fcr.mode, p_ccb->our_cfg.fcr.mode,
2221 p_ccb->ertm_info.preferred_mode, p_ccb->ertm_info.allowed_modes);
2222
2223 /* If Peer wants basic, we are done (accept it or disconnect) */
2224 if (p_cfg->fcr.mode == L2CAP_FCR_BASIC_MODE) {
2225 /* If we do not allow basic, disconnect */
2226 if (!(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_BASIC))
2227 fcr_ok = L2CAP_PEER_CFG_DISCONNECT;
2228 }
2229
2230 /* Need to negotiate if our modes are not the same */
2231 else if (p_cfg->fcr.mode != p_ccb->ertm_info.preferred_mode) {
2232 /* If peer wants a mode that we don't support then retry our mode (ex.
2233 *rtx/flc), OR
2234 ** If we want ERTM and they wanted streaming retry our mode.
2235 ** Note: If we have already determined they support our mode previously
2236 ** from their EXF mask.
2237 */
2238 if ((((1 << p_cfg->fcr.mode) & L2CAP_FCR_CHAN_OPT_ALL_MASK) == 0) ||
2239 (p_ccb->ertm_info.preferred_mode == L2CAP_FCR_ERTM_MODE)) {
2240 p_cfg->fcr.mode = p_ccb->our_cfg.fcr.mode;
2241 p_cfg->fcr.tx_win_sz = p_ccb->our_cfg.fcr.tx_win_sz;
2242 p_cfg->fcr.max_transmit = p_ccb->our_cfg.fcr.max_transmit;
2243 fcr_ok = L2CAP_PEER_CFG_UNACCEPTABLE;
2244 }
2245
2246 /* If we wanted basic, then try to renegotiate it */
2247 else if (p_ccb->ertm_info.preferred_mode == L2CAP_FCR_BASIC_MODE) {
2248 p_cfg->fcr.mode = L2CAP_FCR_BASIC_MODE;
2249 p_cfg->fcr.max_transmit = p_cfg->fcr.tx_win_sz = 0;
2250 p_cfg->fcr.rtrans_tout = p_cfg->fcr.mon_tout = p_cfg->fcr.mps = 0;
2251 p_ccb->our_cfg.fcr.rtrans_tout = p_ccb->our_cfg.fcr.mon_tout =
2252 p_ccb->our_cfg.fcr.mps = 0;
2253 fcr_ok = L2CAP_PEER_CFG_UNACCEPTABLE;
2254 }
2255
2256 /* Only other valid case is if they want ERTM and we wanted STM which should
2257 be
2258 accepted if we support it; otherwise the channel should be disconnected
2259 */
2260 else if ((p_cfg->fcr.mode != L2CAP_FCR_ERTM_MODE) ||
2261 !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM)) {
2262 fcr_ok = L2CAP_PEER_CFG_DISCONNECT;
2263 }
2264 }
2265
2266 /* Configuration for FCR channels so make any adjustments and fwd to upper
2267 * layer */
2268 if (fcr_ok == L2CAP_PEER_CFG_OK) {
2269 /* by default don't need to send params in the response */
2270 p_ccb->out_cfg_fcr_present = false;
2271
2272 /* Make any needed adjustments for the response to the peer */
2273 if (p_cfg->fcr_present && p_cfg->fcr.mode != L2CAP_FCR_BASIC_MODE) {
2274 /* Peer desires to bypass FCS check, and streaming or ERTM mode */
2275 if (p_cfg->fcs_present) {
2276 p_ccb->peer_cfg.fcs = p_cfg->fcs;
2277 p_ccb->peer_cfg_bits |= L2CAP_CH_CFG_MASK_FCS;
2278 if (p_cfg->fcs == L2CAP_CFG_FCS_BYPASS)
2279 p_ccb->bypass_fcs |= L2CAP_CFG_FCS_PEER;
2280 }
2281
2282 max_retrans_size = p_ccb->ertm_info.fcr_tx_buf_size - sizeof(BT_HDR) -
2283 L2CAP_MIN_OFFSET - L2CAP_SDU_LEN_OFFSET -
2284 L2CAP_FCS_LEN;
2285
2286 /* Ensure the MPS is not bigger than the MTU */
2287 if ((p_cfg->fcr.mps == 0) || (p_cfg->fcr.mps > p_ccb->peer_cfg.mtu)) {
2288 p_cfg->fcr.mps = p_ccb->peer_cfg.mtu;
2289 p_ccb->out_cfg_fcr_present = true;
2290 }
2291
2292 /* Ensure the MPS is not bigger than our retransmission buffer */
2293 if (p_cfg->fcr.mps > max_retrans_size) {
2294 L2CAP_TRACE_DEBUG("CFG: Overriding MPS to %d (orig %d)",
2295 max_retrans_size, p_cfg->fcr.mps);
2296
2297 p_cfg->fcr.mps = max_retrans_size;
2298 p_ccb->out_cfg_fcr_present = true;
2299 }
2300
2301 if (p_cfg->fcr.mode == L2CAP_FCR_ERTM_MODE ||
2302 p_cfg->fcr.mode == L2CAP_FCR_STREAM_MODE) {
2303 /* Always respond with FCR ERTM parameters */
2304 p_ccb->out_cfg_fcr_present = true;
2305 }
2306 }
2307
2308 /* Everything ok, so save the peer's adjusted fcr options */
2309 p_ccb->peer_cfg.fcr = p_cfg->fcr;
2310
2311 if (p_cfg->fcr_present) p_ccb->peer_cfg_bits |= L2CAP_CH_CFG_MASK_FCR;
2312 } else if (fcr_ok == L2CAP_PEER_CFG_UNACCEPTABLE) {
2313 /* Allow peer only one retry for mode */
2314 if (p_ccb->peer_cfg_already_rejected)
2315 fcr_ok = L2CAP_PEER_CFG_DISCONNECT;
2316 else
2317 p_ccb->peer_cfg_already_rejected = true;
2318 }
2319
2320 return (fcr_ok);
2321 }
2322
2323 #if (L2CAP_ERTM_STATS == TRUE)
2324 /*******************************************************************************
2325 *
2326 * Function l2c_fcr_collect_ack_delay
2327 *
2328 * Description collect throughput, delay, queue size of waiting ack
2329 *
2330 * Parameters
2331 * tL2C_CCB
2332 *
2333 * Returns void
2334 *
2335 ******************************************************************************/
l2c_fcr_collect_ack_delay(tL2C_CCB * p_ccb,uint8_t num_bufs_acked)2336 static void l2c_fcr_collect_ack_delay(tL2C_CCB* p_ccb, uint8_t num_bufs_acked) {
2337 uint32_t index;
2338 BT_HDR* p_buf;
2339 uint8_t* p;
2340 uint32_t timestamp, delay;
2341 uint8_t xx;
2342 uint8_t str[120];
2343
2344 index = p_ccb->fcrb.ack_delay_avg_index;
2345
2346 /* update sum, max and min of waiting for ack queue size */
2347 p_ccb->fcrb.ack_q_count_avg[index] +=
2348 fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q);
2349
2350 if (fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q) >
2351 p_ccb->fcrb.ack_q_count_max[index])
2352 p_ccb->fcrb.ack_q_count_max[index] =
2353 fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q);
2354
2355 if (fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q) <
2356 p_ccb->fcrb.ack_q_count_min[index])
2357 p_ccb->fcrb.ack_q_count_min[index] =
2358 fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q);
2359
2360 /* update sum, max and min of round trip delay of acking */
2361 list_t* list = NULL;
2362 if (!fixed_queue_is_empty(p_ccb->fcrb.waiting_for_ack_q))
2363 list = fixed_queue_get_list(p_ccb->fcrb.waiting_for_ack_q);
2364 if (list != NULL) {
2365 for (const list_node_t *node = list_begin(list), xx = 0;
2366 (node != list_end(list)) && (xx < num_bufs_acked);
2367 node = list_next(node), xx++) {
2368 p_buf = list_node(node);
2369 /* adding up length of acked I-frames to get throughput */
2370 p_ccb->fcrb.throughput[index] += p_buf->len - 8;
2371
2372 if (xx == num_bufs_acked - 1) {
2373 /* get timestamp from tx I-frame that receiver is acking */
2374 p = ((uint8_t*)(p_buf + 1)) + p_buf->offset + p_buf->len;
2375 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) {
2376 p += L2CAP_FCS_LEN;
2377 }
2378
2379 STREAM_TO_UINT32(timestamp, p);
2380 delay = time_get_os_boottime_ms() - timestamp;
2381
2382 p_ccb->fcrb.ack_delay_avg[index] += delay;
2383 if (delay > p_ccb->fcrb.ack_delay_max[index])
2384 p_ccb->fcrb.ack_delay_max[index] = delay;
2385 if (delay < p_ccb->fcrb.ack_delay_min[index])
2386 p_ccb->fcrb.ack_delay_min[index] = delay;
2387 }
2388 }
2389 }
2390
2391 p_ccb->fcrb.ack_delay_avg_count++;
2392
2393 /* calculate average and initialize next avg, min and max */
2394 if (p_ccb->fcrb.ack_delay_avg_count > L2CAP_ERTM_STATS_AVG_NUM_SAMPLES) {
2395 p_ccb->fcrb.ack_delay_avg_count = 0;
2396
2397 p_ccb->fcrb.ack_q_count_avg[index] /= L2CAP_ERTM_STATS_AVG_NUM_SAMPLES;
2398 p_ccb->fcrb.ack_delay_avg[index] /= L2CAP_ERTM_STATS_AVG_NUM_SAMPLES;
2399
2400 /* calculate throughput */
2401 timestamp = time_get_os_boottime_ms();
2402 if (timestamp - p_ccb->fcrb.throughput_start > 0)
2403 p_ccb->fcrb.throughput[index] /=
2404 (timestamp - p_ccb->fcrb.throughput_start);
2405
2406 p_ccb->fcrb.throughput_start = timestamp;
2407
2408 snprintf(
2409 str, sizeof(str),
2410 "[%02u] throughput: %5u, ack_delay avg:%3u, min:%3u, max:%3u, "
2411 "ack_q_count avg:%3u, min:%3u, max:%3u",
2412 index, p_ccb->fcrb.throughput[index], p_ccb->fcrb.ack_delay_avg[index],
2413 p_ccb->fcrb.ack_delay_min[index], p_ccb->fcrb.ack_delay_max[index],
2414 p_ccb->fcrb.ack_q_count_avg[index], p_ccb->fcrb.ack_q_count_min[index],
2415 p_ccb->fcrb.ack_q_count_max[index]);
2416
2417 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI,
2418 TRACE_TYPE_GENERIC, "%s", str);
2419
2420 index = (index + 1) % L2CAP_ERTM_STATS_NUM_AVG;
2421 p_ccb->fcrb.ack_delay_avg_index = index;
2422
2423 p_ccb->fcrb.ack_q_count_max[index] = 0;
2424 p_ccb->fcrb.ack_q_count_min[index] = 0xFFFFFFFF;
2425 p_ccb->fcrb.ack_q_count_avg[index] = 0;
2426
2427 p_ccb->fcrb.ack_delay_max[index] = 0;
2428 p_ccb->fcrb.ack_delay_min[index] = 0xFFFFFFFF;
2429 p_ccb->fcrb.ack_delay_avg[index] = 0;
2430
2431 p_ccb->fcrb.throughput[index] = 0;
2432 }
2433 }
2434 #endif
2435