1 /******************************************************************************
2 *
3 * Copyright (C) 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 <stdlib.h>
27 #include <string.h>
28 #include <stdio.h>
29
30 #include "gki.h"
31 #include "bt_types.h"
32 #include "hcimsgs.h"
33 #include "l2cdefs.h"
34 #include "l2c_int.h"
35 #include "l2c_api.h"
36 #include "btu.h"
37 #include "btm_api.h"
38 #include "btm_int.h"
39
40
41 /* Flag passed to retransmit_i_frames() when all packets should be retransmitted */
42 #define L2C_FCR_RETX_ALL_PKTS 0xFF
43
44 #if BT_TRACE_VERBOSE == TRUE
45 static char *SAR_types[] = { "Unsegmented", "Start", "End", "Continuation" };
46 static char *SUP_types[] = { "RR", "REJ", "RNR", "SREJ" };
47 #endif
48
49 /* Look-up table for the CRC calculation */
50 static const unsigned short crctab[256] = {
51 0x0000, 0xc0c1, 0xc181, 0x0140, 0xc301, 0x03c0, 0x0280, 0xc241,
52 0xc601, 0x06c0, 0x0780, 0xc741, 0x0500, 0xc5c1, 0xc481, 0x0440,
53 0xcc01, 0x0cc0, 0x0d80, 0xcd41, 0x0f00, 0xcfc1, 0xce81, 0x0e40,
54 0x0a00, 0xcac1, 0xcb81, 0x0b40, 0xc901, 0x09c0, 0x0880, 0xc841,
55 0xd801, 0x18c0, 0x1980, 0xd941, 0x1b00, 0xdbc1, 0xda81, 0x1a40,
56 0x1e00, 0xdec1, 0xdf81, 0x1f40, 0xdd01, 0x1dc0, 0x1c80, 0xdc41,
57 0x1400, 0xd4c1, 0xd581, 0x1540, 0xd701, 0x17c0, 0x1680, 0xd641,
58 0xd201, 0x12c0, 0x1380, 0xd341, 0x1100, 0xd1c1, 0xd081, 0x1040,
59 0xf001, 0x30c0, 0x3180, 0xf141, 0x3300, 0xf3c1, 0xf281, 0x3240,
60 0x3600, 0xf6c1, 0xf781, 0x3740, 0xf501, 0x35c0, 0x3480, 0xf441,
61 0x3c00, 0xfcc1, 0xfd81, 0x3d40, 0xff01, 0x3fc0, 0x3e80, 0xfe41,
62 0xfa01, 0x3ac0, 0x3b80, 0xfb41, 0x3900, 0xf9c1, 0xf881, 0x3840,
63 0x2800, 0xe8c1, 0xe981, 0x2940, 0xeb01, 0x2bc0, 0x2a80, 0xea41,
64 0xee01, 0x2ec0, 0x2f80, 0xef41, 0x2d00, 0xedc1, 0xec81, 0x2c40,
65 0xe401, 0x24c0, 0x2580, 0xe541, 0x2700, 0xe7c1, 0xe681, 0x2640,
66 0x2200, 0xe2c1, 0xe381, 0x2340, 0xe101, 0x21c0, 0x2080, 0xe041,
67 0xa001, 0x60c0, 0x6180, 0xa141, 0x6300, 0xa3c1, 0xa281, 0x6240,
68 0x6600, 0xa6c1, 0xa781, 0x6740, 0xa501, 0x65c0, 0x6480, 0xa441,
69 0x6c00, 0xacc1, 0xad81, 0x6d40, 0xaf01, 0x6fc0, 0x6e80, 0xae41,
70 0xaa01, 0x6ac0, 0x6b80, 0xab41, 0x6900, 0xa9c1, 0xa881, 0x6840,
71 0x7800, 0xb8c1, 0xb981, 0x7940, 0xbb01, 0x7bc0, 0x7a80, 0xba41,
72 0xbe01, 0x7ec0, 0x7f80, 0xbf41, 0x7d00, 0xbdc1, 0xbc81, 0x7c40,
73 0xb401, 0x74c0, 0x7580, 0xb541, 0x7700, 0xb7c1, 0xb681, 0x7640,
74 0x7200, 0xb2c1, 0xb381, 0x7340, 0xb101, 0x71c0, 0x7080, 0xb041,
75 0x5000, 0x90c1, 0x9181, 0x5140, 0x9301, 0x53c0, 0x5280, 0x9241,
76 0x9601, 0x56c0, 0x5780, 0x9741, 0x5500, 0x95c1, 0x9481, 0x5440,
77 0x9c01, 0x5cc0, 0x5d80, 0x9d41, 0x5f00, 0x9fc1, 0x9e81, 0x5e40,
78 0x5a00, 0x9ac1, 0x9b81, 0x5b40, 0x9901, 0x59c0, 0x5880, 0x9841,
79 0x8801, 0x48c0, 0x4980, 0x8941, 0x4b00, 0x8bc1, 0x8a81, 0x4a40,
80 0x4e00, 0x8ec1, 0x8f81, 0x4f40, 0x8d01, 0x4dc0, 0x4c80, 0x8c41,
81 0x4400, 0x84c1, 0x8581, 0x4540, 0x8701, 0x47c0, 0x4680, 0x8641,
82 0x8201, 0x42c0, 0x4380, 0x8341, 0x4100, 0x81c1, 0x8081, 0x4040,
83 };
84
85
86 /*******************************************************************************
87 ** Static local functions
88 */
89 static BOOLEAN process_reqseq (tL2C_CCB *p_ccb, UINT16 ctrl_word);
90 static void process_s_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word);
91 static void process_i_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word, BOOLEAN delay_ack);
92 static BOOLEAN retransmit_i_frames (tL2C_CCB *p_ccb, UINT8 tx_seq);
93 static void prepare_I_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, BOOLEAN is_retransmission);
94 static void process_stream_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf);
95 static BOOLEAN do_sar_reassembly (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word);
96
97 #if L2CAP_CORRUPT_ERTM_PKTS == TRUE
98 static BOOLEAN l2c_corrupt_the_fcr_packet (tL2C_CCB *p_ccb, BT_HDR *p_buf,
99 BOOLEAN is_rx, UINT16 ctrl_word);
100 static BOOLEAN l2c_bypass_sframe_packet (tL2C_CCB *p_ccb);
101 #endif
102
103 #if (L2CAP_ERTM_STATS == TRUE)
104 static void l2c_fcr_collect_ack_delay (tL2C_CCB *p_ccb, UINT8 num_bufs_acked);
105 #endif
106
107 /*******************************************************************************
108 **
109 ** Function l2c_fcr_updcrc
110 **
111 ** Description This function computes the CRC using the look-up table.
112 **
113 ** Returns CRC
114 **
115 *******************************************************************************/
l2c_fcr_updcrc(unsigned short icrc,unsigned char * icp,int icnt)116 unsigned short l2c_fcr_updcrc(unsigned short icrc, unsigned char *icp, int icnt)
117 {
118 register unsigned short crc = icrc;
119 register unsigned char *cp = icp;
120 register int cnt = icnt;
121
122 while (cnt--)
123 {
124 crc = ((crc >> 8) & 0xff) ^ crctab[(crc & 0xff) ^ *cp++];
125 }
126
127 return(crc);
128 }
129
130
131 /*******************************************************************************
132 **
133 ** Function l2c_fcr_tx_get_fcs
134 **
135 ** Description This function computes the CRC for a frame to be TXed.
136 **
137 ** Returns CRC
138 **
139 *******************************************************************************/
l2c_fcr_tx_get_fcs(BT_HDR * p_buf)140 UINT16 l2c_fcr_tx_get_fcs (BT_HDR *p_buf)
141 {
142 UINT8 *p = ((UINT8 *) (p_buf + 1)) + p_buf->offset;
143
144 return (l2c_fcr_updcrc (L2CAP_FCR_INIT_CRC, p, p_buf->len));
145 }
146
147 /*******************************************************************************
148 **
149 ** Function l2c_fcr_rx_get_fcs
150 **
151 ** Description This function computes the CRC for a received frame.
152 **
153 ** Returns CRC
154 **
155 *******************************************************************************/
l2c_fcr_rx_get_fcs(BT_HDR * p_buf)156 UINT16 l2c_fcr_rx_get_fcs (BT_HDR *p_buf)
157 {
158 UINT8 *p = ((UINT8 *) (p_buf + 1)) + p_buf->offset;
159
160 /* offset points past the L2CAP header, but the CRC check includes it */
161 p -= L2CAP_PKT_OVERHEAD;
162
163 return (l2c_fcr_updcrc (L2CAP_FCR_INIT_CRC, p, p_buf->len + L2CAP_PKT_OVERHEAD));
164 }
165
166 /*******************************************************************************
167 **
168 ** Function l2c_fcr_start_timer
169 **
170 ** Description This function starts the (monitor or retransmission) timer.
171 **
172 ** Returns -
173 **
174 *******************************************************************************/
l2c_fcr_start_timer(tL2C_CCB * p_ccb)175 void l2c_fcr_start_timer (tL2C_CCB *p_ccb)
176 {
177 UINT32 tout;
178
179 /* The timers which are in milliseconds */
180 if (p_ccb->fcrb.wait_ack)
181 {
182 tout = (UINT32)p_ccb->our_cfg.fcr.mon_tout;
183 }
184 else
185 {
186 tout = (UINT32)p_ccb->our_cfg.fcr.rtrans_tout;
187 }
188 /*
189 L2CAP_TRACE_DEBUG4 ("l2c_fcr_start_timer Tout: %u Already Running: %u wait_ack: %u ack_q_count: %u",
190 tout, p_ccb->timer_entry.in_use, p_ccb->fcrb.wait_ack, p_ccb->fcrb.waiting_for_ack_q.count);
191 */
192 /* Only start a timer that was not started */
193 if (p_ccb->fcrb.mon_retrans_timer.in_use == 0)
194 btu_start_quick_timer (&p_ccb->fcrb.mon_retrans_timer, BTU_TTYPE_L2CAP_CHNL, tout*QUICK_TIMER_TICKS_PER_SEC/1000);
195 }
196
197 /*******************************************************************************
198 **
199 ** Function l2c_fcr_stop_timer
200 **
201 ** Description This function stops the (monitor or transmission) timer.
202 **
203 ** Returns -
204 **
205 *******************************************************************************/
l2c_fcr_stop_timer(tL2C_CCB * p_ccb)206 void l2c_fcr_stop_timer (tL2C_CCB *p_ccb)
207 {
208 if (p_ccb->fcrb.mon_retrans_timer.in_use)
209 {
210 /*
211 L2CAP_TRACE_DEBUG2 ("l2c_fcr_stop_timer wait_ack: %u ack_q_count: %u",
212 p_ccb->fcrb.wait_ack, p_ccb->fcrb.waiting_for_ack_q.count);
213 */
214 btu_stop_quick_timer (&p_ccb->fcrb.mon_retrans_timer);
215 }
216 }
217
218 /*******************************************************************************
219 **
220 ** Function l2c_fcr_cleanup
221 **
222 ** Description This function cleans up the variable used for flow-control/retrans.
223 **
224 ** Returns -
225 **
226 *******************************************************************************/
l2c_fcr_cleanup(tL2C_CCB * p_ccb)227 void l2c_fcr_cleanup (tL2C_CCB *p_ccb)
228 {
229 tL2C_FCRB *p_fcrb = &p_ccb->fcrb;
230
231 l2c_fcr_stop_timer (p_ccb);
232
233 if (p_fcrb->p_rx_sdu)
234 GKI_freebuf (p_fcrb->p_rx_sdu);
235
236 while (p_fcrb->waiting_for_ack_q.p_first)
237 GKI_freebuf (GKI_dequeue (&p_fcrb->waiting_for_ack_q));
238
239 while (p_fcrb->srej_rcv_hold_q.p_first)
240 GKI_freebuf (GKI_dequeue (&p_fcrb->srej_rcv_hold_q));
241
242 while (p_fcrb->retrans_q.p_first)
243 GKI_freebuf (GKI_dequeue (&p_fcrb->retrans_q));
244
245 btu_stop_quick_timer (&p_fcrb->ack_timer);
246 btu_stop_quick_timer (&p_ccb->fcrb.mon_retrans_timer);
247
248 #if (L2CAP_ERTM_STATS == TRUE)
249 if ( (p_ccb->local_cid >= L2CAP_BASE_APPL_CID) && (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) )
250 {
251 UINT32 dur = GKI_get_os_tick_count() - p_ccb->fcrb.connect_tick_count;
252 char *p_str = (char *)GKI_getbuf(120);
253 UINT16 i;
254 UINT32 throughput_avg, ack_delay_avg, ack_q_count_avg;
255
256 dur = GKI_OS_TICKS_TO_MS(dur);
257 BT_TRACE_2(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC,
258 "--- L2CAP ERTM Stats for CID: 0x%04x Duration: %08ums", p_ccb->local_cid, dur);
259 BT_TRACE_4(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC,
260 "Retransmissions:%08u Times Flow Controlled:%08u Retrans Touts:%08u Ack Touts:%08u",
261 p_ccb->fcrb.pkts_retransmitted, p_ccb->fcrb.xmit_window_closed, p_ccb->fcrb.retrans_touts, p_ccb->fcrb.xmit_ack_touts);
262 BT_TRACE_1(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC,
263 "Times there is less than 2 packets in controller when flow controlled:%08u", p_ccb->fcrb.controller_idle);
264 BT_TRACE_2(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC,
265 "max_held_acks:%08u, in_cfg.fcr.tx_win_sz:%08u", p_ccb->fcrb.max_held_acks, p_ccb->peer_cfg.fcr.tx_win_sz );
266 if (p_str)
267 {
268 sprintf(p_str, "Sent Pkts:%08u Bytes:%10u(%06u/sec) RR:%08u REJ:%08u RNR:%08u SREJ:%08u",
269 p_ccb->fcrb.ertm_pkt_counts[0], p_ccb->fcrb.ertm_byte_counts[0],
270 (dur >= 10 ? (p_ccb->fcrb.ertm_byte_counts[0] * 100) / (dur / 10) : 0),
271 p_ccb->fcrb.s_frames_sent[0], p_ccb->fcrb.s_frames_sent[1], p_ccb->fcrb.s_frames_sent[2], p_ccb->fcrb.s_frames_sent[3]);
272
273 BT_TRACE_1(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", p_str);
274
275 sprintf(p_str, "Rcvd Pkts:%08u Bytes:%10u(%06u/sec) RR:%08u REJ:%08u RNR:%08u 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], p_ccb->fcrb.s_frames_rcvd[2], p_ccb->fcrb.s_frames_rcvd[3]);
279
280 BT_TRACE_1(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", p_str);
281
282 throughput_avg = 0;
283 ack_delay_avg = 0;
284 ack_q_count_avg = 0;
285
286 for (i = 0; i < L2CAP_ERTM_STATS_NUM_AVG; i++ )
287 {
288 if (i == p_ccb->fcrb.ack_delay_avg_index )
289 {
290 BT_TRACE_1(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC,
291 "[%02u] collecting data ...", i );
292 continue;
293 }
294
295 sprintf(p_str, "[%02u] throughput: %5u, ack_delay avg:%3u, min:%3u, max:%3u, ack_q_count avg:%3u, min:%3u, max:%3u",
296 i, p_ccb->fcrb.throughput[i],
297 p_ccb->fcrb.ack_delay_avg[i], p_ccb->fcrb.ack_delay_min[i], p_ccb->fcrb.ack_delay_max[i],
298 p_ccb->fcrb.ack_q_count_avg[i], p_ccb->fcrb.ack_q_count_min[i], p_ccb->fcrb.ack_q_count_max[i] );
299
300 BT_TRACE_1(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", p_str);
301
302 throughput_avg += p_ccb->fcrb.throughput[i];
303 ack_delay_avg += p_ccb->fcrb.ack_delay_avg[i];
304 ack_q_count_avg += p_ccb->fcrb.ack_q_count_avg[i];
305 }
306
307 throughput_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1);
308 ack_delay_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1);
309 ack_q_count_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1);
310
311 BT_TRACE_3(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC,
312 "throughput_avg: %8u (kbytes/sec), ack_delay_avg: %8u ms, ack_q_count_avg: %8u",
313 throughput_avg, ack_delay_avg, ack_q_count_avg );
314
315 GKI_freebuf(p_str);
316 }
317
318 BT_TRACE_0(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC,
319 "---");
320 }
321 #endif
322
323 memset (p_fcrb, 0, sizeof (tL2C_FCRB));
324 }
325
326 /*******************************************************************************
327 **
328 ** Function l2c_fcr_clone_buf
329 **
330 ** Description This function allocates and copies requested part of a buffer
331 ** at a new-offset.
332 **
333 ** Returns pointer to new buffer
334 **
335 *******************************************************************************/
l2c_fcr_clone_buf(BT_HDR * p_buf,UINT16 new_offset,UINT16 no_of_bytes,UINT8 pool)336 BT_HDR *l2c_fcr_clone_buf (BT_HDR *p_buf, UINT16 new_offset, UINT16 no_of_bytes, UINT8 pool)
337 {
338 BT_HDR *p_buf2;
339
340 /* If using the common pool, should be at least 10% free. */
341 if ( (pool == HCI_ACL_POOL_ID) && (GKI_poolutilization (pool) > 90) )
342 {
343 L2CAP_TRACE_ERROR1 ("L2CAP - failed to clone buffer on HCI_ACL_POOL_ID Utilization: %u", GKI_poolutilization(pool));
344 return (NULL);
345 }
346
347 if ((p_buf2 = (BT_HDR *)GKI_getpoolbuf(pool)) != NULL)
348 {
349 UINT16 pool_buf_size = GKI_get_pool_bufsize (pool);
350
351 /* Make sure buffer fits into buffer pool */
352 if ((no_of_bytes + sizeof(BT_HDR) + new_offset) > pool_buf_size)
353 {
354 L2CAP_TRACE_ERROR5("##### l2c_fcr_clone_buf (NumBytes %d) -> Exceeds poolsize %d [bytes %d + BT_HDR %d + offset %d]",
355 (no_of_bytes + sizeof(BT_HDR) + new_offset),
356 pool_buf_size, no_of_bytes, sizeof(BT_HDR),
357 new_offset);
358
359 GKI_freebuf(p_buf2);
360 return (NULL);
361 }
362
363 p_buf2->offset = new_offset;
364 p_buf2->len = no_of_bytes;
365
366 memcpy (((UINT8 *)(p_buf2 + 1)) + p_buf2->offset,
367 ((UINT8 *)(p_buf + 1)) + p_buf->offset,
368 no_of_bytes);
369 }
370 else
371 {
372 L2CAP_TRACE_ERROR2 ("L2CAP - failed to clone buffer, Pool: %u Count: %u", pool, GKI_poolfreecount(pool));
373 }
374
375 return (p_buf2);
376 }
377
378 /*******************************************************************************
379 **
380 ** Function l2c_fcr_is_flow_controlled
381 **
382 ** Description This function checks if the CCB is flow controlled by peer.
383 **
384 ** Returns The control word
385 **
386 *******************************************************************************/
l2c_fcr_is_flow_controlled(tL2C_CCB * p_ccb)387 BOOLEAN l2c_fcr_is_flow_controlled (tL2C_CCB *p_ccb)
388 {
389 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE)
390 {
391 /* Check if remote side flowed us off or the transmit window is full */
392 if ( (p_ccb->fcrb.remote_busy == TRUE)
393 || (p_ccb->fcrb.waiting_for_ack_q.count >= p_ccb->peer_cfg.fcr.tx_win_sz) )
394 {
395 #if (L2CAP_ERTM_STATS == TRUE)
396 if (p_ccb->xmit_hold_q.count != 0)
397 {
398 p_ccb->fcrb.xmit_window_closed++;
399
400 if ((p_ccb->p_lcb->sent_not_acked < 2)&&(l2cb.controller_xmit_window > 0))
401 p_ccb->fcrb.controller_idle++;
402 }
403 #endif
404 return (TRUE);
405 }
406 }
407 return (FALSE);
408 }
409
410 /*******************************************************************************
411 **
412 ** Function prepare_I_frame
413 **
414 ** Description This function sets the FCR variables in an I-frame that is
415 ** about to be sent to HCI for transmission. This may be the
416 ** first time the I-frame is sent, or a retransmission
417 **
418 ** Returns -
419 **
420 *******************************************************************************/
prepare_I_frame(tL2C_CCB * p_ccb,BT_HDR * p_buf,BOOLEAN is_retransmission)421 static void prepare_I_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, BOOLEAN is_retransmission)
422 {
423 tL2C_FCRB *p_fcrb = &p_ccb->fcrb;
424 UINT8 *p;
425 UINT16 fcs;
426 UINT16 ctrl_word;
427 BOOLEAN set_f_bit = p_fcrb->send_f_rsp;
428
429 p_fcrb->send_f_rsp = FALSE;
430
431 if (is_retransmission)
432 {
433 /* Get the old control word and clear out the old req_seq and F bits */
434 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + L2CAP_PKT_OVERHEAD;
435
436 STREAM_TO_UINT16 (ctrl_word, p);
437
438 ctrl_word &= ~(L2CAP_FCR_REQ_SEQ_BITS + L2CAP_FCR_F_BIT);
439 }
440 else
441 {
442 ctrl_word = p_buf->layer_specific & L2CAP_FCR_SEG_BITS; /* SAR bits */
443 ctrl_word |= (p_fcrb->next_tx_seq << L2CAP_FCR_TX_SEQ_BITS_SHIFT); /* Tx Seq */
444
445 p_fcrb->next_tx_seq = (p_fcrb->next_tx_seq + 1) & L2CAP_FCR_SEQ_MODULO;
446 }
447
448 /* Set the F-bit and reqseq only if using re-transmission mode */
449 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE)
450 {
451 if (set_f_bit)
452 ctrl_word |= L2CAP_FCR_F_BIT;
453
454 ctrl_word |= (p_fcrb->next_seq_expected) << L2CAP_FCR_REQ_SEQ_BITS_SHIFT;
455
456 p_fcrb->last_ack_sent = p_ccb->fcrb.next_seq_expected;
457
458 if (p_ccb->fcrb.ack_timer.in_use)
459 btu_stop_quick_timer (&p_ccb->fcrb.ack_timer);
460 }
461
462 /* Set the control word */
463 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + L2CAP_PKT_OVERHEAD;
464
465 UINT16_TO_STREAM (p, ctrl_word);
466
467 /* Compute the FCS and add to the end of the buffer if not bypassed */
468 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS)
469 {
470 /* length field in l2cap header has to include FCS length */
471 p = ((UINT8 *) (p_buf+1)) + p_buf->offset;
472 UINT16_TO_STREAM (p, p_buf->len + L2CAP_FCS_LEN - L2CAP_PKT_OVERHEAD);
473
474 /* Calculate the FCS */
475 fcs = l2c_fcr_tx_get_fcs(p_buf);
476
477 /* Point to the end of the buffer and put the FCS there */
478 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + p_buf->len;
479
480 UINT16_TO_STREAM (p, fcs);
481
482 p_buf->len += L2CAP_FCS_LEN;
483 }
484
485 #if BT_TRACE_VERBOSE == TRUE
486 if (is_retransmission)
487 {
488 L2CAP_TRACE_EVENT6 ("L2CAP eRTM ReTx I-frame CID: 0x%04x Len: %u SAR: %s TxSeq: %u ReqSeq: %u F: %u",
489 p_ccb->local_cid, p_buf->len,
490 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT],
491 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT,
492 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
493 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
494 }
495 else
496 {
497 L2CAP_TRACE_EVENT6 ("L2CAP eRTM Tx I-frame CID: 0x%04x Len: %u SAR: %-12s TxSeq: %u ReqSeq: %u F: %u",
498 p_ccb->local_cid, p_buf->len,
499 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT],
500 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT,
501 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
502 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
503 }
504 #endif
505
506 /* Start the retransmission timer if not already running */
507 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE)
508 l2c_fcr_start_timer (p_ccb);
509 }
510
511 /*******************************************************************************
512 **
513 ** Function l2c_fcr_send_S_frame
514 **
515 ** Description This function formats and sends an S-frame for transmission.
516 **
517 ** Returns -
518 **
519 *******************************************************************************/
l2c_fcr_send_S_frame(tL2C_CCB * p_ccb,UINT16 function_code,UINT16 pf_bit)520 void l2c_fcr_send_S_frame (tL2C_CCB *p_ccb, UINT16 function_code, UINT16 pf_bit)
521 {
522 BT_HDR *p_buf;
523 UINT8 *p;
524 UINT16 ctrl_word;
525 UINT16 fcs;
526
527 #if L2CAP_CORRUPT_ERTM_PKTS == TRUE
528 /* Only used for conformance testing */
529 if (l2c_bypass_sframe_packet (p_ccb))
530 return;
531 #endif
532
533 if ((!p_ccb->in_use) || (p_ccb->chnl_state != CST_OPEN))
534 return;
535
536 #if (L2CAP_ERTM_STATS == TRUE)
537 p_ccb->fcrb.s_frames_sent[function_code]++;
538 #endif
539
540 if (pf_bit == L2CAP_FCR_P_BIT)
541 {
542 p_ccb->fcrb.wait_ack = TRUE;
543
544 l2c_fcr_stop_timer (p_ccb); /* Restart the monitor timer */
545 l2c_fcr_start_timer (p_ccb);
546 }
547
548 /* Create the control word to use */
549 ctrl_word = (function_code << L2CAP_FCR_SUP_SHIFT) | L2CAP_FCR_S_FRAME_BIT;
550 ctrl_word |= (p_ccb->fcrb.next_seq_expected << L2CAP_FCR_REQ_SEQ_BITS_SHIFT);
551 ctrl_word |= pf_bit;
552
553 if ((p_buf = (BT_HDR *)GKI_getpoolbuf (L2CAP_CMD_POOL_ID)) != NULL)
554 {
555 p_buf->offset = HCI_DATA_PREAMBLE_SIZE;
556 p_buf->len = L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD;
557
558 /* Set the pointer to the beginning of the data */
559 p = (UINT8 *)(p_buf + 1) + p_buf->offset;
560
561 /* Put in the L2CAP header */
562 UINT16_TO_STREAM (p, L2CAP_FCR_OVERHEAD + L2CAP_FCS_LEN);
563 UINT16_TO_STREAM (p, p_ccb->remote_cid);
564 UINT16_TO_STREAM (p, ctrl_word);
565
566 /* Compute the FCS and add to the end of the buffer if not bypassed */
567 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS)
568 {
569 fcs = l2c_fcr_tx_get_fcs (p_buf);
570
571 UINT16_TO_STREAM (p, fcs);
572 p_buf->len += L2CAP_FCS_LEN;
573 }
574 else /* rewrite the length without FCS length */
575 {
576 p -= 6;
577 UINT16_TO_STREAM (p, L2CAP_FCR_OVERHEAD);
578 }
579
580 #if L2CAP_CORRUPT_ERTM_PKTS == TRUE
581 /* Get out if packet was dropped */
582 if (l2c_corrupt_the_fcr_packet (p_ccb, p_buf, FALSE, ctrl_word))
583 return;
584 #endif
585 /* Now, the HCI transport header */
586 p_buf->layer_specific = L2CAP_NON_FLUSHABLE_PKT;
587 l2cu_set_acl_hci_header (p_buf, p_ccb);
588
589 #if BT_TRACE_VERBOSE == TRUE
590 if ((((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 1)
591 || (((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 3))
592 {
593 L2CAP_TRACE_WARNING6 ("L2CAP eRTM Tx S-frame CID: 0x%04x ctrlword: 0x%04x Type: %s ReqSeq: %u P: %u F: %u",
594 p_ccb->local_cid, ctrl_word,
595 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT],
596 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
597 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT,
598 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
599 L2CAP_TRACE_WARNING1 (" Buf Len: %u", p_buf->len);
600 }
601 else
602 {
603 L2CAP_TRACE_EVENT6 ("L2CAP eRTM Tx S-frame CID: 0x%04x ctrlword: 0x%04x Type: %s ReqSeq: %u P: %u F: %u",
604 p_ccb->local_cid, ctrl_word,
605 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT],
606 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
607 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT,
608 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
609 L2CAP_TRACE_EVENT1 (" Buf Len: %u", p_buf->len);
610 }
611 #endif /* BT_TRACE_VERBOSE */
612
613 l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, p_buf);
614
615 p_ccb->fcrb.last_ack_sent = p_ccb->fcrb.next_seq_expected;
616
617 if (p_ccb->fcrb.ack_timer.in_use)
618 btu_stop_quick_timer (&p_ccb->fcrb.ack_timer);
619 }
620 else
621 {
622 L2CAP_TRACE_ERROR2 ("l2c_fcr_send_S_frame(No Resources) cid 0x%04x, Type: 0x%4x",
623 p_ccb->local_cid, function_code);
624 }
625 }
626
627
628 /*******************************************************************************
629 **
630 ** Function l2c_fcr_proc_pdu
631 **
632 ** Description This function is the entry point for processing of a
633 ** received PDU when in flow control and/or retransmission modes.
634 **
635 ** Returns -
636 **
637 *******************************************************************************/
l2c_fcr_proc_pdu(tL2C_CCB * p_ccb,BT_HDR * p_buf)638 void l2c_fcr_proc_pdu (tL2C_CCB *p_ccb, BT_HDR *p_buf)
639 {
640 UINT8 *p;
641 UINT16 fcs;
642 UINT16 min_pdu_len;
643 UINT16 ctrl_word;
644
645 /* Check the length */
646 min_pdu_len = (p_ccb->bypass_fcs == L2CAP_BYPASS_FCS) ?
647 (UINT16)L2CAP_FCR_OVERHEAD : (UINT16)(L2CAP_FCS_LEN + L2CAP_FCR_OVERHEAD);
648
649 if (p_buf->len < min_pdu_len)
650 {
651 L2CAP_TRACE_WARNING2 ("Rx L2CAP PDU: CID: 0x%04x Len too short: %u", p_ccb->local_cid, p_buf->len);
652 GKI_freebuf (p_buf);
653 return;
654 }
655
656 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_STREAM_MODE)
657 {
658 process_stream_frame (p_ccb, p_buf);
659 return;
660 }
661
662 #if BT_TRACE_VERBOSE == TRUE
663 /* Get the control word */
664 p = ((UINT8 *)(p_buf+1)) + p_buf->offset;
665 STREAM_TO_UINT16 (ctrl_word, p);
666
667 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT)
668 {
669 if ((((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 1)
670 || (((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 3))
671 {
672 /* REJ or SREJ */
673 L2CAP_TRACE_WARNING6 ("L2CAP eRTM Rx S-frame: cid: 0x%04x Len: %u Type: %s ReqSeq: %u P: %u F: %u",
674 p_ccb->local_cid, p_buf->len,
675 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT],
676 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
677 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT,
678 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
679 }
680 else
681 {
682 L2CAP_TRACE_EVENT6 ("L2CAP eRTM Rx S-frame: cid: 0x%04x Len: %u Type: %s ReqSeq: %u P: %u F: %u",
683 p_ccb->local_cid, p_buf->len,
684 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT],
685 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
686 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT,
687 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
688 }
689 }
690 else
691 {
692 L2CAP_TRACE_EVENT6 ("L2CAP eRTM Rx I-frame: cid: 0x%04x Len: %u SAR: %-12s TxSeq: %u ReqSeq: %u F: %u",
693 p_ccb->local_cid, p_buf->len,
694 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT],
695 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT,
696 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
697 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
698 }
699
700 L2CAP_TRACE_EVENT6 (" eRTM Rx Nxt_tx_seq %u, Lst_rx_ack %u, Nxt_seq_exp %u, Lst_ack_snt %u, wt_q.cnt %u, tries %u",
701 p_ccb->fcrb.next_tx_seq, p_ccb->fcrb.last_rx_ack, p_ccb->fcrb.next_seq_expected,
702 p_ccb->fcrb.last_ack_sent, p_ccb->fcrb.waiting_for_ack_q.count, p_ccb->fcrb.num_tries);
703
704 #endif /* BT_TRACE_VERBOSE */
705
706 #if L2CAP_CORRUPT_ERTM_PKTS == TRUE
707 p = ((UINT8 *)(p_buf+1)) + p_buf->offset;
708 STREAM_TO_UINT16 (ctrl_word, p);
709
710 /* Get out if packet was dropped */
711 if (l2c_corrupt_the_fcr_packet (p_ccb, p_buf, TRUE, ctrl_word))
712 return;
713 #endif /* L2CAP_CORRUPT_ERTM_PKTS */
714
715 /* Verify FCS if using */
716 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS)
717 {
718 p = ((UINT8 *)(p_buf+1)) + p_buf->offset + p_buf->len - L2CAP_FCS_LEN;
719
720 /* Extract and drop the FCS from the packet */
721 STREAM_TO_UINT16 (fcs, p);
722 p_buf->len -= L2CAP_FCS_LEN;
723
724 if (l2c_fcr_rx_get_fcs(p_buf) != fcs)
725 {
726 L2CAP_TRACE_WARNING1 ("Rx L2CAP PDU: CID: 0x%04x BAD FCS", p_ccb->local_cid);
727 GKI_freebuf(p_buf);
728 return;
729 }
730 }
731
732 /* Get the control word */
733 p = ((UINT8 *)(p_buf+1)) + p_buf->offset;
734
735 STREAM_TO_UINT16 (ctrl_word, p);
736
737 p_buf->len -= L2CAP_FCR_OVERHEAD;
738 p_buf->offset += L2CAP_FCR_OVERHEAD;
739
740 /* If we had a poll bit outstanding, check if we got a final response */
741 if (p_ccb->fcrb.wait_ack)
742 {
743 /* If final bit not set, ignore the frame unless it is a polled S-frame */
744 if ( !(ctrl_word & L2CAP_FCR_F_BIT) )
745 {
746 if ( (ctrl_word & L2CAP_FCR_P_BIT) && (ctrl_word & L2CAP_FCR_S_FRAME_BIT) )
747 {
748 if (p_ccb->fcrb.srej_sent)
749 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_SREJ, L2CAP_FCR_F_BIT);
750 else if (p_ccb->fcrb.local_busy)
751 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_F_BIT);
752 else
753 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_F_BIT);
754
755 /* Got a poll while in wait_ack state, so re-start our timer with 1-second */
756 /* This is a small optimization... the monitor timer is 12 secs, but we saw */
757 /* that if the other side sends us a poll when we are waiting for a final, */
758 /* then it speeds up recovery significantly if we poll him back soon after his poll. */
759 btu_start_quick_timer (&p_ccb->fcrb.mon_retrans_timer, BTU_TTYPE_L2CAP_CHNL, QUICK_TIMER_TICKS_PER_SEC);
760 }
761 GKI_freebuf (p_buf);
762 return;
763 }
764
765 p_ccb->fcrb.wait_ack = FALSE;
766
767 /* P and F are mutually exclusive */
768 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT)
769 ctrl_word &= ~L2CAP_FCR_P_BIT;
770
771 if (p_ccb->fcrb.waiting_for_ack_q.count == 0)
772 p_ccb->fcrb.num_tries = 0;
773
774 l2c_fcr_stop_timer (p_ccb);
775 }
776 else
777 {
778 /* Otherwise, ensure the final bit is ignored */
779 ctrl_word &= ~L2CAP_FCR_F_BIT;
780 }
781
782 /* Process receive sequence number */
783 if (!process_reqseq (p_ccb, ctrl_word))
784 {
785 GKI_freebuf (p_buf);
786 return;
787 }
788
789 /* Process based on whether it is an S-frame or an I-frame */
790 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT)
791 process_s_frame (p_ccb, p_buf, ctrl_word);
792 else
793 process_i_frame (p_ccb, p_buf, ctrl_word, FALSE);
794
795 /* Return if the channel got disconnected by a bad packet or max retransmissions */
796 if ( (!p_ccb->in_use) || (p_ccb->chnl_state != CST_OPEN) )
797 return;
798
799 /* If we have some buffers held while doing SREJ, and SREJ has cleared, process them now */
800 if ( (!p_ccb->fcrb.local_busy) && (!p_ccb->fcrb.srej_sent) && (p_ccb->fcrb.srej_rcv_hold_q.count > 0) )
801 {
802 BUFFER_Q temp_q = p_ccb->fcrb.srej_rcv_hold_q;
803
804 GKI_init_q (&p_ccb->fcrb.srej_rcv_hold_q);
805
806 while ((p_buf = (BT_HDR *)GKI_dequeue (&temp_q)) != NULL)
807 {
808 if (p_ccb->in_use && (p_ccb->chnl_state == CST_OPEN))
809 {
810 /* Get the control word */
811 p = ((UINT8 *)(p_buf+1)) + p_buf->offset - L2CAP_FCR_OVERHEAD;
812
813 STREAM_TO_UINT16 (ctrl_word, p);
814
815 L2CAP_TRACE_DEBUG3 ("l2c_fcr_proc_pdu() CID: 0x%04x Process Buffer from SREJ_Hold_Q TxSeq: %u Expected_Seq: %u",
816 p_ccb->local_cid, (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT,
817 p_ccb->fcrb.next_seq_expected);
818
819 /* Process the SREJ held I-frame, but do not send an RR for each individual frame */
820 process_i_frame (p_ccb, p_buf, ctrl_word, TRUE);
821 }
822 else
823 GKI_freebuf (p_buf);
824
825 /* If more frames were lost during SREJ, send a REJ */
826 if (p_ccb->fcrb.rej_after_srej)
827 {
828 p_ccb->fcrb.rej_after_srej = FALSE;
829 p_ccb->fcrb.rej_sent = TRUE;
830
831 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_REJ, 0);
832 }
833 }
834
835 /* Now, if needed, send one RR for the whole held queue */
836 if ( (!p_ccb->fcrb.local_busy) && (!p_ccb->fcrb.rej_sent) && (!p_ccb->fcrb.srej_sent)
837 && (p_ccb->fcrb.next_seq_expected != p_ccb->fcrb.last_ack_sent) )
838 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, 0);
839 else
840 {
841 L2CAP_TRACE_DEBUG6 ("l2c_fcr_proc_pdu() not sending RR CID: 0x%04x local_busy:%d rej_sent:%d srej_sent:%d Expected_Seq:%u Last_Ack:%u",
842 p_ccb->local_cid, p_ccb->fcrb.local_busy, p_ccb->fcrb.rej_sent, p_ccb->fcrb.srej_sent, p_ccb->fcrb.next_seq_expected,
843 p_ccb->fcrb.last_ack_sent);
844 }
845 }
846
847 /* If a window has opened, check if we can send any more packets */
848 if ( (p_ccb->fcrb.retrans_q.count || p_ccb->xmit_hold_q.count)
849 && (p_ccb->fcrb.wait_ack == FALSE)
850 && (l2c_fcr_is_flow_controlled (p_ccb) == FALSE) )
851 {
852 l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, NULL);
853 }
854 }
855
856 /*******************************************************************************
857 **
858 ** Function l2c_fcr_proc_tout
859 **
860 ** Description Handle a timeout. We should be in error recovery state.
861 **
862 ** Returns -
863 **
864 *******************************************************************************/
l2c_fcr_proc_tout(tL2C_CCB * p_ccb)865 void l2c_fcr_proc_tout (tL2C_CCB *p_ccb)
866 {
867 L2CAP_TRACE_DEBUG5 ("l2c_fcr_proc_tout: CID: 0x%04x num_tries: %u (max: %u) wait_ack: %u ack_q_count: %u",
868 p_ccb->local_cid, p_ccb->fcrb.num_tries, p_ccb->peer_cfg.fcr.max_transmit,
869 p_ccb->fcrb.wait_ack, p_ccb->fcrb.waiting_for_ack_q.count);
870
871 #if (L2CAP_ERTM_STATS == TRUE)
872 p_ccb->fcrb.retrans_touts++;
873 #endif
874
875 if ( (p_ccb->peer_cfg.fcr.max_transmit != 0) && (++p_ccb->fcrb.num_tries > p_ccb->peer_cfg.fcr.max_transmit) )
876 {
877 l2cu_disconnect_chnl (p_ccb);
878 }
879 else
880 {
881 if (!p_ccb->fcrb.srej_sent && !p_ccb->fcrb.rej_sent)
882 {
883 if (p_ccb->fcrb.local_busy)
884 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_P_BIT);
885 else
886 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_P_BIT);
887 }
888 }
889 }
890
891
892 /*******************************************************************************
893 **
894 ** Function l2c_fcr_proc_ack_tout
895 **
896 ** Description Send RR/RNR if we have not acked I frame
897 **
898 ** Returns -
899 **
900 *******************************************************************************/
l2c_fcr_proc_ack_tout(tL2C_CCB * p_ccb)901 void l2c_fcr_proc_ack_tout (tL2C_CCB *p_ccb)
902 {
903 L2CAP_TRACE_DEBUG5 ("l2c_fcr_proc_ack_tout: CID: 0x%04x State: %u Wack:%u Rq:%d Acked:%d", p_ccb->local_cid,
904 p_ccb->chnl_state, p_ccb->fcrb.wait_ack, p_ccb->fcrb.next_seq_expected, p_ccb->fcrb.last_ack_sent);
905
906 if ( (p_ccb->chnl_state == CST_OPEN) && (!p_ccb->fcrb.wait_ack)
907 && (p_ccb->fcrb.last_ack_sent != p_ccb->fcrb.next_seq_expected) )
908 {
909 #if (L2CAP_ERTM_STATS == TRUE)
910 p_ccb->fcrb.xmit_ack_touts++;
911 #endif
912 if (p_ccb->fcrb.local_busy)
913 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, 0);
914 else
915 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, 0);
916 }
917 }
918
919
920 /*******************************************************************************
921 **
922 ** Function process_reqseq
923 **
924 ** Description Handle receive sequence number
925 **
926 ** Returns -
927 **
928 *******************************************************************************/
process_reqseq(tL2C_CCB * p_ccb,UINT16 ctrl_word)929 static BOOLEAN process_reqseq (tL2C_CCB *p_ccb, UINT16 ctrl_word)
930 {
931 tL2C_FCRB *p_fcrb = &p_ccb->fcrb;
932 UINT8 req_seq, num_bufs_acked, xx;
933 UINT16 ls;
934 UINT16 full_sdus_xmitted;
935
936 /* Receive sequence number does not ack anything for SREJ with P-bit set to zero */
937 if ( (ctrl_word & L2CAP_FCR_S_FRAME_BIT)
938 && ((ctrl_word & L2CAP_FCR_SUP_BITS) == (L2CAP_FCR_SUP_SREJ << L2CAP_FCR_SUP_SHIFT))
939 && ((ctrl_word & L2CAP_FCR_P_BIT) == 0) )
940 {
941 /* If anything still waiting for ack, restart the timer if it was stopped */
942 if (p_fcrb->waiting_for_ack_q.count)
943 l2c_fcr_start_timer (p_ccb);
944
945 return (TRUE);
946 }
947
948 /* Extract the receive sequence number from the control word */
949 req_seq = (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT;
950
951 num_bufs_acked = (req_seq - p_fcrb->last_rx_ack) & L2CAP_FCR_SEQ_MODULO;
952
953 /* Verify the request sequence is in range before proceeding */
954 if (num_bufs_acked > p_fcrb->waiting_for_ack_q.count)
955 {
956 /* The channel is closed if ReqSeq is not in range */
957 L2CAP_TRACE_WARNING4 ("L2CAP eRTM Frame BAD Req_Seq - ctrl_word: 0x%04x req_seq 0x%02x last_rx_ack: 0x%02x QCount: %u",
958 ctrl_word, req_seq, p_fcrb->last_rx_ack, p_fcrb->waiting_for_ack_q.count);
959
960 l2cu_disconnect_chnl (p_ccb);
961 return (FALSE);
962 }
963
964 /*
965 L2CAP_TRACE_DEBUG3 ("L2CAP process_reqseq 0x%02x last_rx_ack: 0x%02x QCount: %u",
966 req_seq, p_fcrb->last_rx_ack, p_fcrb->waiting_for_ack_q.count);
967 */
968 p_fcrb->last_rx_ack = req_seq;
969
970 /* Now we can release all acknowledged frames, and restart the retransmission timer if needed */
971 if (num_bufs_acked != 0)
972 {
973 p_fcrb->num_tries = 0;
974 full_sdus_xmitted = 0;
975
976 #if (L2CAP_ERTM_STATS == TRUE)
977 l2c_fcr_collect_ack_delay (p_ccb, num_bufs_acked);
978 #endif
979
980 for (xx = 0; xx < num_bufs_acked; xx++)
981 {
982 ls = ((BT_HDR *)(p_fcrb->waiting_for_ack_q.p_first))->layer_specific & L2CAP_FCR_SAR_BITS;
983
984 if ( (ls == L2CAP_FCR_UNSEG_SDU) || (ls == L2CAP_FCR_END_SDU) )
985 full_sdus_xmitted++;
986
987 GKI_freebuf (GKI_dequeue (&p_fcrb->waiting_for_ack_q));
988 }
989
990 /* If we are still in a wait_ack state, do not mess with the timer */
991 if (!p_ccb->fcrb.wait_ack)
992 l2c_fcr_stop_timer (p_ccb);
993
994 /* Check if we need to call the "packet_sent" callback */
995 if ( (p_ccb->p_rcb) && (p_ccb->p_rcb->api.pL2CA_TxComplete_Cb) && (full_sdus_xmitted) )
996 {
997 /* Special case for eRTM, if all packets sent, send 0xFFFF */
998 if ( (p_fcrb->waiting_for_ack_q.count == 0) && (p_ccb->xmit_hold_q.count == 0) )
999 full_sdus_xmitted = 0xFFFF;
1000
1001 (*p_ccb->p_rcb->api.pL2CA_TxComplete_Cb)(p_ccb->local_cid, full_sdus_xmitted);
1002 }
1003 }
1004
1005 /* If anything still waiting for ack, restart the timer if it was stopped */
1006 if (p_fcrb->waiting_for_ack_q.count)
1007 l2c_fcr_start_timer (p_ccb);
1008
1009 return (TRUE);
1010 }
1011
1012
1013 /*******************************************************************************
1014 **
1015 ** Function process_s_frame
1016 **
1017 ** Description Process an S frame
1018 **
1019 ** Returns -
1020 **
1021 *******************************************************************************/
process_s_frame(tL2C_CCB * p_ccb,BT_HDR * p_buf,UINT16 ctrl_word)1022 static void process_s_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word)
1023 {
1024 tL2C_FCRB *p_fcrb = &p_ccb->fcrb;
1025 UINT16 s_frame_type = (ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT;
1026 BOOLEAN remote_was_busy;
1027 BOOLEAN all_ok = TRUE;
1028
1029 if (p_buf->len != 0)
1030 {
1031 L2CAP_TRACE_WARNING1 ("Incorrect S-frame Length (%d)", p_buf->len);
1032 }
1033
1034 L2CAP_TRACE_DEBUG2 ("process_s_frame ctrl_word 0x%04x fcrb_remote_busy:%d", ctrl_word, p_fcrb->remote_busy);
1035
1036 #if (L2CAP_ERTM_STATS == TRUE)
1037 p_ccb->fcrb.s_frames_rcvd[s_frame_type]++;
1038 #endif
1039
1040 if (ctrl_word & L2CAP_FCR_P_BIT)
1041 {
1042 p_fcrb->rej_sent = FALSE; /* After checkpoint, we can send anoher REJ */
1043 p_fcrb->send_f_rsp = TRUE; /* Set a flag in case an I-frame is pending */
1044 }
1045
1046 switch (s_frame_type)
1047 {
1048 case L2CAP_FCR_SUP_RR:
1049 remote_was_busy = p_fcrb->remote_busy;
1050 p_fcrb->remote_busy = FALSE;
1051
1052 if ( (ctrl_word & L2CAP_FCR_F_BIT) || (remote_was_busy) )
1053 all_ok = retransmit_i_frames (p_ccb, L2C_FCR_RETX_ALL_PKTS);
1054 break;
1055
1056 case L2CAP_FCR_SUP_REJ:
1057 p_fcrb->remote_busy = FALSE;
1058 all_ok = retransmit_i_frames (p_ccb, L2C_FCR_RETX_ALL_PKTS);
1059 break;
1060
1061 case L2CAP_FCR_SUP_RNR:
1062 p_fcrb->remote_busy = TRUE;
1063 l2c_fcr_stop_timer (p_ccb);
1064 break;
1065
1066 case L2CAP_FCR_SUP_SREJ:
1067 p_fcrb->remote_busy = FALSE;
1068 all_ok = retransmit_i_frames (p_ccb, (UINT8)((ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT));
1069 break;
1070 }
1071
1072 if (all_ok)
1073 {
1074 /* If polled, we need to respond with F-bit. Note, we may have sent a I-frame with the F-bit */
1075 if (p_fcrb->send_f_rsp)
1076 {
1077 if (p_fcrb->srej_sent)
1078 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_SREJ, L2CAP_FCR_F_BIT);
1079 else if (p_fcrb->local_busy)
1080 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_F_BIT);
1081 else
1082 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_F_BIT);
1083
1084 p_fcrb->send_f_rsp = FALSE;
1085 }
1086 }
1087 else
1088 {
1089 L2CAP_TRACE_DEBUG0 ("process_s_frame hit_max_retries");
1090 }
1091
1092 GKI_freebuf (p_buf);
1093 }
1094
1095
1096 /*******************************************************************************
1097 **
1098 ** Function process_i_frame
1099 **
1100 ** Description Process an I frame
1101 **
1102 ** Returns -
1103 **
1104 *******************************************************************************/
process_i_frame(tL2C_CCB * p_ccb,BT_HDR * p_buf,UINT16 ctrl_word,BOOLEAN delay_ack)1105 static void process_i_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word, BOOLEAN delay_ack)
1106 {
1107 tL2C_FCRB *p_fcrb = &p_ccb->fcrb;
1108 UINT8 tx_seq, num_lost, num_to_ack, next_srej;
1109
1110 /* If we were doing checkpoint recovery, first retransmit all unacked I-frames */
1111 if (ctrl_word & L2CAP_FCR_F_BIT)
1112 {
1113 if (!retransmit_i_frames (p_ccb, L2C_FCR_RETX_ALL_PKTS))
1114 {
1115 GKI_freebuf(p_buf);
1116 return;
1117 }
1118 }
1119
1120 #if (L2CAP_ERTM_STATS == TRUE)
1121 p_ccb->fcrb.ertm_pkt_counts[1]++;
1122 p_ccb->fcrb.ertm_byte_counts[1] += p_buf->len;
1123 #endif
1124
1125 /* Extract the sequence number */
1126 tx_seq = (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT;
1127
1128 /* If we have flow controlled the peer, ignore any bad I-frames from him */
1129 if ( (tx_seq != p_fcrb->next_seq_expected) && (p_fcrb->local_busy) )
1130 {
1131 L2CAP_TRACE_WARNING1 ("Dropping bad I-Frame since we flowed off, tx_seq:%u", tx_seq);
1132 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, 0);
1133 GKI_freebuf(p_buf);
1134 return;
1135 }
1136
1137 /* If there are no free buffers in the user Rx queue, drop the */
1138 /* received buffer now before we update any sequence numbers */
1139 if (GKI_poolfreecount (p_ccb->ertm_info.user_rx_pool_id) == 0)
1140 {
1141 L2CAP_TRACE_WARNING4 ("L2CAP CID: 0x%04x Dropping I-Frame seq: %u User RX Pool: %u (Size: %u) has no free buffers!!",
1142 p_ccb->local_cid, tx_seq, p_ccb->ertm_info.user_rx_pool_id,
1143 GKI_poolcount (p_ccb->ertm_info.user_rx_pool_id));
1144 GKI_freebuf(p_buf);
1145 return;
1146 }
1147
1148 /* Check if tx-sequence is the expected one */
1149 if (tx_seq != p_fcrb->next_seq_expected)
1150 {
1151 num_lost = (tx_seq - p_fcrb->next_seq_expected) & L2CAP_FCR_SEQ_MODULO;
1152
1153 /* Is the frame a duplicate ? If so, just drop it */
1154 if (num_lost >= p_ccb->our_cfg.fcr.tx_win_sz)
1155 {
1156 /* Duplicate - simply drop it */
1157 L2CAP_TRACE_WARNING2 ("process_i_frame() Dropping Duplicate Frame tx_seq:%u ExpectedTxSeq %u", tx_seq, p_fcrb->next_seq_expected);
1158 GKI_freebuf(p_buf);
1159 }
1160 else
1161 {
1162 L2CAP_TRACE_WARNING6 ("process_i_frame() CID: 0x%04x Lost: %u tx_seq:%u ExpTxSeq %u Rej: %u SRej: %u",
1163 p_ccb->local_cid, num_lost, tx_seq, p_fcrb->next_seq_expected, p_fcrb->rej_sent, p_fcrb->srej_sent);
1164
1165 if (p_fcrb->srej_sent)
1166 {
1167 /* If SREJ sent, save the frame for later processing as long as it is in sequence */
1168 next_srej = (((BT_HDR *)p_fcrb->srej_rcv_hold_q.p_last)->layer_specific + 1) & L2CAP_FCR_SEQ_MODULO;
1169
1170 if ( (tx_seq == next_srej) && (p_fcrb->srej_rcv_hold_q.count < p_ccb->our_cfg.fcr.tx_win_sz) )
1171 {
1172 /* If user gave us a pool for held rx buffers, use that */
1173 if (p_ccb->ertm_info.fcr_rx_pool_id != HCI_ACL_POOL_ID)
1174 {
1175 BT_HDR *p_buf2;
1176
1177 /* Adjust offset and len so that control word is copied */
1178 p_buf->offset -= L2CAP_FCR_OVERHEAD;
1179 p_buf->len += L2CAP_FCR_OVERHEAD;
1180
1181 p_buf2 = l2c_fcr_clone_buf (p_buf, p_buf->offset, p_buf->len, p_ccb->ertm_info.fcr_rx_pool_id);
1182
1183 if (p_buf2)
1184 {
1185 GKI_freebuf (p_buf);
1186 p_buf = p_buf2;
1187 }
1188 p_buf->offset += L2CAP_FCR_OVERHEAD;
1189 p_buf->len -= L2CAP_FCR_OVERHEAD;
1190 }
1191 L2CAP_TRACE_DEBUG4 ("process_i_frame() Lost: %u tx_seq:%u ExpTxSeq %u Rej: %u SRej1",
1192 num_lost, tx_seq, p_fcrb->next_seq_expected, p_fcrb->rej_sent);
1193
1194 p_buf->layer_specific = tx_seq;
1195 GKI_enqueue (&p_fcrb->srej_rcv_hold_q, p_buf);
1196 }
1197 else
1198 {
1199 L2CAP_TRACE_WARNING4 ("process_i_frame() CID: 0x%04x frame dropped in Srej Sent next_srej:%u hold_q.count:%u win_sz:%u",
1200 p_ccb->local_cid, next_srej, p_fcrb->srej_rcv_hold_q.count, p_ccb->our_cfg.fcr.tx_win_sz);
1201
1202 p_fcrb->rej_after_srej = TRUE;
1203 GKI_freebuf (p_buf);
1204 }
1205 }
1206 else if (p_fcrb->rej_sent)
1207 {
1208 L2CAP_TRACE_WARNING5 ("process_i_frame() CID: 0x%04x Lost: %u tx_seq:%u ExpTxSeq %u Rej: 1 SRej: %u",
1209 p_ccb->local_cid, num_lost, tx_seq, p_fcrb->next_seq_expected, p_fcrb->srej_sent);
1210
1211 /* If REJ sent, just drop the frame */
1212 GKI_freebuf (p_buf);
1213 }
1214 else
1215 {
1216 L2CAP_TRACE_DEBUG4 ("process_i_frame() CID: 0x%04x tx_seq:%u ExpTxSeq %u Rej: %u",
1217 p_ccb->local_cid, tx_seq, p_fcrb->next_seq_expected, p_fcrb->rej_sent);
1218
1219 /* If only one lost, we will send SREJ, otherwise we will send REJ */
1220 if (num_lost > 1)
1221 {
1222 GKI_freebuf (p_buf);
1223 p_fcrb->rej_sent = TRUE;
1224 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_REJ, 0);
1225 }
1226 else
1227 {
1228 if (p_fcrb->srej_rcv_hold_q.count != 0)
1229 {
1230 L2CAP_TRACE_ERROR3 ("process_i_frame() CID: 0x%04x sending SREJ tx_seq:%d hold_q.count:%u",
1231 p_ccb->local_cid, tx_seq, p_fcrb->srej_rcv_hold_q.count);
1232 }
1233 p_buf->layer_specific = tx_seq;
1234 GKI_enqueue (&p_fcrb->srej_rcv_hold_q, p_buf);
1235 p_fcrb->srej_sent = TRUE;
1236 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_SREJ, 0);
1237 }
1238 btu_stop_quick_timer (&p_ccb->fcrb.ack_timer);
1239 }
1240 }
1241 return;
1242 }
1243
1244 /* Seq number is the next expected. Clear possible reject exception in case it occured */
1245 p_fcrb->rej_sent = p_fcrb->srej_sent = FALSE;
1246
1247 /* Adjust the next_seq, so that if the upper layer sends more data in the callback
1248 context, the received frame is acked by an I-frame. */
1249 p_fcrb->next_seq_expected = (tx_seq + 1) & L2CAP_FCR_SEQ_MODULO;
1250
1251 /* If any SAR problem in eRTM mode, spec says disconnect. */
1252 if (!do_sar_reassembly (p_ccb, p_buf, ctrl_word))
1253 {
1254 L2CAP_TRACE_WARNING1 ("process_i_frame() CID: 0x%04x reassembly failed", p_ccb->local_cid);
1255 l2cu_disconnect_chnl (p_ccb);
1256 return;
1257 }
1258
1259 /* RR optimization - if peer can still send us more, then start an ACK timer */
1260 num_to_ack = (p_fcrb->next_seq_expected - p_fcrb->last_ack_sent) & L2CAP_FCR_SEQ_MODULO;
1261
1262 if ( (num_to_ack < p_ccb->fcrb.max_held_acks) && (!p_fcrb->local_busy) )
1263 delay_ack = TRUE;
1264
1265 /* We should neve never ack frame if we are not in OPEN state */
1266 if ((num_to_ack != 0) && p_ccb->in_use && (p_ccb->chnl_state == CST_OPEN))
1267 {
1268 /* If no frames are awaiting transmission or are held, send an RR or RNR S-frame for ack */
1269 if (delay_ack)
1270 {
1271 /* If it is the first I frame we did not ack, start ack timer */
1272 if (!p_ccb->fcrb.ack_timer.in_use)
1273 {
1274 btu_start_quick_timer (&p_ccb->fcrb.ack_timer, BTU_TTYPE_L2CAP_FCR_ACK,
1275 (L2CAP_FCR_ACK_TOUT*QUICK_TIMER_TICKS_PER_SEC)/1000);
1276 }
1277 }
1278 else if ( ((p_ccb->xmit_hold_q.count == 0) || (l2c_fcr_is_flow_controlled (p_ccb)))
1279 && (p_ccb->fcrb.srej_rcv_hold_q.count == 0) )
1280 {
1281 if (p_fcrb->local_busy)
1282 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, 0);
1283 else
1284 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, 0);
1285 }
1286 }
1287 }
1288
1289
1290 /*******************************************************************************
1291 **
1292 ** Function process_stream_frame
1293 **
1294 ** Description This function processes frames in streaming mode
1295 **
1296 ** Returns -
1297 **
1298 *******************************************************************************/
process_stream_frame(tL2C_CCB * p_ccb,BT_HDR * p_buf)1299 static void process_stream_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf)
1300 {
1301 UINT16 ctrl_word;
1302 UINT16 fcs;
1303 UINT8 *p;
1304 UINT8 tx_seq;
1305
1306 /* Verify FCS if using */
1307 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS)
1308 {
1309 p = ((UINT8 *)(p_buf+1)) + p_buf->offset + p_buf->len - L2CAP_FCS_LEN;
1310
1311 /* Extract and drop the FCS from the packet */
1312 STREAM_TO_UINT16 (fcs, p);
1313 p_buf->len -= L2CAP_FCS_LEN;
1314
1315 if (l2c_fcr_rx_get_fcs(p_buf) != fcs)
1316 {
1317 L2CAP_TRACE_WARNING1 ("Rx L2CAP PDU: CID: 0x%04x BAD FCS", p_ccb->local_cid);
1318 GKI_freebuf(p_buf);
1319 return;
1320 }
1321 }
1322
1323 /* Get the control word */
1324 p = ((UINT8 *)(p_buf+1)) + p_buf->offset;
1325
1326 STREAM_TO_UINT16 (ctrl_word, p);
1327
1328 p_buf->len -= L2CAP_FCR_OVERHEAD;
1329 p_buf->offset += L2CAP_FCR_OVERHEAD;
1330
1331 /* Make sure it is an I-frame */
1332 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT)
1333 {
1334 L2CAP_TRACE_WARNING2 ("Rx L2CAP PDU: CID: 0x%04x BAD S-frame in streaming mode ctrl_word: 0x%04x", p_ccb->local_cid, ctrl_word);
1335 GKI_freebuf (p_buf);
1336 return;
1337 }
1338
1339 #if BT_TRACE_VERBOSE == TRUE
1340 L2CAP_TRACE_EVENT6 ("L2CAP eRTM Rx I-frame: cid: 0x%04x Len: %u SAR: %-12s TxSeq: %u ReqSeq: %u F: %u",
1341 p_ccb->local_cid, p_buf->len,
1342 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT],
1343 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT,
1344 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
1345 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
1346 #endif
1347
1348 /* Extract the sequence number */
1349 tx_seq = (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT;
1350
1351 /* Check if tx-sequence is the expected one */
1352 if (tx_seq != p_ccb->fcrb.next_seq_expected)
1353 {
1354 L2CAP_TRACE_WARNING4 ("Rx L2CAP PDU: CID: 0x%04x Lost frames Exp: %u Got: %u p_rx_sdu: 0x%08x",
1355 p_ccb->local_cid, p_ccb->fcrb.next_seq_expected, tx_seq, p_ccb->fcrb.p_rx_sdu);
1356
1357 /* Lost one or more packets, so flush the SAR queue */
1358 if (p_ccb->fcrb.p_rx_sdu != NULL)
1359 {
1360 GKI_freebuf (p_ccb->fcrb.p_rx_sdu);
1361 p_ccb->fcrb.p_rx_sdu = NULL;
1362 }
1363 }
1364
1365 p_ccb->fcrb.next_seq_expected = (tx_seq + 1) & L2CAP_FCR_SEQ_MODULO;
1366
1367 if (!do_sar_reassembly (p_ccb, p_buf, ctrl_word))
1368 {
1369 /* Some sort of SAR error, so flush the SAR queue */
1370 if (p_ccb->fcrb.p_rx_sdu != NULL)
1371 {
1372 GKI_freebuf (p_ccb->fcrb.p_rx_sdu);
1373 p_ccb->fcrb.p_rx_sdu = NULL;
1374 }
1375 }
1376 }
1377
1378
1379 /*******************************************************************************
1380 **
1381 ** Function do_sar_reassembly
1382 **
1383 ** Description Process SAR bits and re-assemble frame
1384 **
1385 ** Returns TRUE if all OK, else FALSE
1386 **
1387 *******************************************************************************/
do_sar_reassembly(tL2C_CCB * p_ccb,BT_HDR * p_buf,UINT16 ctrl_word)1388 static BOOLEAN do_sar_reassembly (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word)
1389 {
1390 tL2C_FCRB *p_fcrb = &p_ccb->fcrb;
1391 UINT16 sar_type = ctrl_word & L2CAP_FCR_SEG_BITS;
1392 BOOLEAN packet_ok = TRUE;
1393 UINT8 *p;
1394
1395 /* Check if the SAR state is correct */
1396 if ((sar_type == L2CAP_FCR_UNSEG_SDU) || (sar_type == L2CAP_FCR_START_SDU))
1397 {
1398 if (p_fcrb->p_rx_sdu != NULL)
1399 {
1400 L2CAP_TRACE_WARNING2 ("SAR - got unexpected unsegmented or start SDU Expected len: %u Got so far: %u",
1401 p_fcrb->rx_sdu_len, p_fcrb->p_rx_sdu->len);
1402
1403 packet_ok = FALSE;
1404 }
1405 /* Check the length of the packet */
1406 if ( (sar_type == L2CAP_FCR_START_SDU) && (p_buf->len < L2CAP_SDU_LEN_OVERHEAD) )
1407 {
1408 L2CAP_TRACE_WARNING1 ("SAR start packet too short: %u", p_buf->len);
1409 packet_ok = FALSE;
1410 }
1411 }
1412 else
1413 {
1414 if (p_fcrb->p_rx_sdu == NULL)
1415 {
1416 L2CAP_TRACE_WARNING0 ("SAR - got unexpected cont or end SDU");
1417 packet_ok = FALSE;
1418 }
1419 }
1420
1421 if ( (packet_ok) && (sar_type != L2CAP_FCR_UNSEG_SDU) )
1422 {
1423 p = ((UINT8 *)(p_buf + 1)) + p_buf->offset;
1424
1425 /* For start SDU packet, extract the SDU length */
1426 if (sar_type == L2CAP_FCR_START_SDU)
1427 {
1428 /* Get the SDU length */
1429 STREAM_TO_UINT16 (p_fcrb->rx_sdu_len, p);
1430 p_buf->offset += 2;
1431 p_buf->len -= 2;
1432
1433 if (p_fcrb->rx_sdu_len > p_ccb->max_rx_mtu)
1434 {
1435 L2CAP_TRACE_WARNING2 ("SAR - SDU len: %u larger than MTU: %u", p_fcrb->rx_sdu_len, p_fcrb->rx_sdu_len);
1436 packet_ok = FALSE;
1437 }
1438 else if ((p_fcrb->p_rx_sdu = (BT_HDR *)GKI_getpoolbuf (p_ccb->ertm_info.user_rx_pool_id)) == NULL)
1439 {
1440 L2CAP_TRACE_ERROR1 ("SAR - no buffer for SDU start user_rx_pool_id:%d", p_ccb->ertm_info.user_rx_pool_id);
1441 packet_ok = FALSE;
1442 }
1443 else
1444 {
1445 p_fcrb->p_rx_sdu->offset = 4; /* this is the minimal offset required by OBX to process incoming packets */
1446 p_fcrb->p_rx_sdu->len = 0;
1447 }
1448 }
1449
1450 if (packet_ok)
1451 {
1452 if ((p_fcrb->p_rx_sdu->len + p_buf->len) > p_fcrb->rx_sdu_len)
1453 {
1454 L2CAP_TRACE_ERROR4 ("SAR - SDU len exceeded Type: %u Lengths: %u %u %u",
1455 sar_type, p_fcrb->p_rx_sdu->len, p_buf->len, p_fcrb->rx_sdu_len);
1456 packet_ok = FALSE;
1457 }
1458 else if ( (sar_type == L2CAP_FCR_END_SDU) && ((p_fcrb->p_rx_sdu->len + p_buf->len) != p_fcrb->rx_sdu_len) )
1459 {
1460 L2CAP_TRACE_WARNING3 ("SAR - SDU end rcvd but SDU incomplete: %u %u %u",
1461 p_fcrb->p_rx_sdu->len, p_buf->len, p_fcrb->rx_sdu_len);
1462 packet_ok = FALSE;
1463 }
1464 else
1465 {
1466 memcpy (((UINT8 *) (p_fcrb->p_rx_sdu + 1)) + p_fcrb->p_rx_sdu->offset + p_fcrb->p_rx_sdu->len, p, p_buf->len);
1467
1468 p_fcrb->p_rx_sdu->len += p_buf->len;
1469
1470 GKI_freebuf (p_buf);
1471 p_buf = NULL;
1472
1473 if (sar_type == L2CAP_FCR_END_SDU)
1474 {
1475 p_buf = p_fcrb->p_rx_sdu;
1476 p_fcrb->p_rx_sdu = NULL;
1477 }
1478 }
1479 }
1480 }
1481
1482 if (packet_ok == FALSE)
1483 {
1484 GKI_freebuf (p_buf);
1485 }
1486 else if (p_buf != NULL)
1487 {
1488 #if (L2CAP_NUM_FIXED_CHNLS > 0)
1489 if (p_ccb->local_cid < L2CAP_BASE_APPL_CID &&
1490 (p_ccb->local_cid >= L2CAP_FIRST_FIXED_CHNL && p_ccb->local_cid <= L2CAP_LAST_FIXED_CHNL))
1491 {
1492 if (l2cb.fixed_reg[p_ccb->local_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb)
1493 (*l2cb.fixed_reg[p_ccb->local_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb)(p_ccb->p_lcb->remote_bd_addr, p_buf);
1494 }
1495 else
1496 #endif
1497 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DATA, p_buf);
1498 }
1499
1500 return (packet_ok);
1501 }
1502
1503
1504 /*******************************************************************************
1505 **
1506 ** Function retransmit_i_frames
1507 **
1508 ** Description This function retransmits i-frames awaiting acks.
1509 **
1510 ** Returns BOOLEAN - TRUE if retransmitted
1511 **
1512 *******************************************************************************/
retransmit_i_frames(tL2C_CCB * p_ccb,UINT8 tx_seq)1513 static BOOLEAN retransmit_i_frames (tL2C_CCB *p_ccb, UINT8 tx_seq)
1514 {
1515 BT_HDR *p_buf, *p_buf2;
1516 UINT8 *p;
1517 UINT8 buf_seq;
1518 UINT16 ctrl_word;
1519
1520 if ( (p_ccb->fcrb.waiting_for_ack_q.p_first)
1521 && (p_ccb->peer_cfg.fcr.max_transmit != 0)
1522 && (p_ccb->fcrb.num_tries >= p_ccb->peer_cfg.fcr.max_transmit) )
1523 {
1524 L2CAP_TRACE_EVENT5 ("Max Tries Exceeded: (last_acq: %d CID: 0x%04x num_tries: %u (max: %u) ack_q_count: %u",
1525 p_ccb->fcrb.last_rx_ack, p_ccb->local_cid, p_ccb->fcrb.num_tries, p_ccb->peer_cfg.fcr.max_transmit,
1526 p_ccb->fcrb.waiting_for_ack_q.count);
1527
1528 l2cu_disconnect_chnl (p_ccb);
1529 return (FALSE);
1530 }
1531
1532 /* tx_seq indicates whether to retransmit a specific sequence or all (if == L2C_FCR_RETX_ALL_PKTS) */
1533 if (tx_seq != L2C_FCR_RETX_ALL_PKTS)
1534 {
1535 /* If sending only one, the sequence number tells us which one. Look for it.
1536 */
1537 for (p_buf = (BT_HDR *)p_ccb->fcrb.waiting_for_ack_q.p_first; p_buf; p_buf = (BT_HDR *)GKI_getnext (p_buf))
1538 {
1539 /* Get the old control word */
1540 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + L2CAP_PKT_OVERHEAD;
1541
1542 STREAM_TO_UINT16 (ctrl_word, p);
1543
1544 buf_seq = (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT;
1545
1546 L2CAP_TRACE_DEBUG2 ("retransmit_i_frames() cur seq: %u looking for: %u", buf_seq, tx_seq);
1547
1548 if (tx_seq == buf_seq)
1549 break;
1550 }
1551
1552 if (!p_buf)
1553 {
1554 L2CAP_TRACE_ERROR2 ("retransmit_i_frames() UNKNOWN seq: %u q_count: %u", tx_seq, p_ccb->fcrb.waiting_for_ack_q.count);
1555 return (TRUE);
1556 }
1557 }
1558 else
1559 {
1560 /* Retransmitting everything. Flush buffers we already put in the link xmit queue.
1561 */
1562 p_buf = (BT_HDR *)p_ccb->p_lcb->link_xmit_data_q.p_first;
1563
1564 while (p_buf != NULL)
1565 {
1566 /* Do not flush other CIDs or partial segments */
1567 if ( (p_buf->layer_specific == 0) && (p_buf->event == p_ccb->local_cid) )
1568 {
1569 p_buf2 = p_buf;
1570 p_buf = (BT_HDR *)GKI_getnext (p_buf);
1571
1572 GKI_remove_from_queue (&p_ccb->p_lcb->link_xmit_data_q, p_buf2);
1573 GKI_freebuf (p_buf2);
1574 }
1575 else
1576 p_buf = (BT_HDR *)GKI_getnext (p_buf);
1577 }
1578
1579 /* Also flush our retransmission queue */
1580 while (p_ccb->fcrb.retrans_q.p_first)
1581 GKI_freebuf (GKI_dequeue (&p_ccb->fcrb.retrans_q));
1582
1583 p_buf = (BT_HDR *)p_ccb->fcrb.waiting_for_ack_q.p_first;
1584 }
1585
1586 while (p_buf != NULL)
1587 {
1588 p_buf2 = l2c_fcr_clone_buf (p_buf, p_buf->offset, p_buf->len, p_ccb->ertm_info.fcr_tx_pool_id);
1589
1590 if (p_buf2)
1591 {
1592 p_buf2->layer_specific = p_buf->layer_specific;
1593
1594 GKI_enqueue (&p_ccb->fcrb.retrans_q, p_buf2);
1595 }
1596
1597 if ( (tx_seq != L2C_FCR_RETX_ALL_PKTS) || (p_buf2 == NULL) )
1598 break;
1599 else
1600 p_buf = (BT_HDR *)GKI_getnext (p_buf);
1601 }
1602
1603 l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, NULL);
1604
1605 if (p_ccb->fcrb.waiting_for_ack_q.count)
1606 {
1607 p_ccb->fcrb.num_tries++;
1608 l2c_fcr_start_timer (p_ccb);
1609 }
1610
1611 return (TRUE);
1612 }
1613
1614
1615 /*******************************************************************************
1616 **
1617 ** Function l2c_fcr_get_next_xmit_sdu_seg
1618 **
1619 ** Description Get the next SDU segment to transmit.
1620 **
1621 ** Returns pointer to buffer with segment or NULL
1622 **
1623 *******************************************************************************/
l2c_fcr_get_next_xmit_sdu_seg(tL2C_CCB * p_ccb,UINT16 max_packet_length)1624 BT_HDR *l2c_fcr_get_next_xmit_sdu_seg (tL2C_CCB *p_ccb, UINT16 max_packet_length)
1625 {
1626 BOOLEAN first_seg = FALSE, /* The segment is the first part of data */
1627 mid_seg = FALSE, /* The segment is the middle part of data */
1628 last_seg = FALSE; /* The segment is the last part of data */
1629 UINT16 sdu_len = 0;
1630 BT_HDR *p_buf, *p_xmit;
1631 UINT8 *p;
1632 UINT16 max_pdu = p_ccb->tx_mps /* Needed? - L2CAP_MAX_HEADER_FCS*/;
1633
1634 /* If there is anything in the retransmit queue, that goes first
1635 */
1636 if (p_ccb->fcrb.retrans_q.p_first)
1637 {
1638 p_buf = (BT_HDR *)GKI_dequeue (&p_ccb->fcrb.retrans_q);
1639
1640 /* Update Rx Seq and FCS if we acked some packets while this one was queued */
1641 prepare_I_frame (p_ccb, p_buf, TRUE);
1642
1643 p_buf->event = p_ccb->local_cid;
1644
1645 #if L2CAP_CORRUPT_ERTM_PKTS == TRUE
1646 /* Use sdu_len to hold the control word */
1647 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + L2CAP_PKT_OVERHEAD;
1648 STREAM_TO_UINT16 (sdu_len, p);
1649
1650 /* Get out if packet was dropped; just pretend it went out */
1651 if (l2c_corrupt_the_fcr_packet (p_ccb, p_buf, FALSE, sdu_len))
1652 return (NULL);
1653 #endif /* L2CAP_CORRUPT_ERTM_PKTS */
1654
1655 #if (L2CAP_ERTM_STATS == TRUE)
1656 p_ccb->fcrb.pkts_retransmitted++;
1657 p_ccb->fcrb.ertm_pkt_counts[0]++;
1658 p_ccb->fcrb.ertm_byte_counts[0] += (p_buf->len - 8);
1659 #endif
1660 return (p_buf);
1661 }
1662
1663 /* For BD/EDR controller, max_packet_length is set to 0 */
1664 /* For AMP controller, max_packet_length is set by available blocks */
1665 if ( (max_packet_length > L2CAP_MAX_HEADER_FCS)
1666 && (max_pdu + L2CAP_MAX_HEADER_FCS > max_packet_length) )
1667 {
1668 max_pdu = max_packet_length - L2CAP_MAX_HEADER_FCS;
1669 }
1670
1671 p_buf = (BT_HDR *)p_ccb->xmit_hold_q.p_first;
1672
1673 /* If there is more data than the MPS, it requires segmentation */
1674 if (p_buf->len > max_pdu)
1675 {
1676 /* We are using the "event" field to tell is if we already started segmentation */
1677 if (p_buf->event == 0)
1678 {
1679 first_seg = TRUE;
1680 sdu_len = p_buf->len;
1681 }
1682 else
1683 mid_seg = TRUE;
1684
1685 /* Get a new buffer and copy the data that can be sent in a PDU */
1686 p_xmit = l2c_fcr_clone_buf (p_buf, L2CAP_MIN_OFFSET + L2CAP_SDU_LEN_OFFSET,
1687 max_pdu, p_ccb->ertm_info.fcr_tx_pool_id);
1688
1689 if (p_xmit != NULL)
1690 {
1691 p_buf->event = p_ccb->local_cid;
1692 p_xmit->event = p_ccb->local_cid;
1693
1694 p_buf->len -= max_pdu;
1695 p_buf->offset += max_pdu;
1696
1697 /* copy PBF setting */
1698 p_xmit->layer_specific = p_buf->layer_specific;
1699 }
1700 else /* Should never happen if the application has configured buffers correctly */
1701 {
1702 L2CAP_TRACE_ERROR1 ("L2CAP - cannot get buffer, for segmentation, pool: %u", p_ccb->ertm_info.fcr_tx_pool_id);
1703 return (NULL);
1704 }
1705 }
1706 else /* Use the original buffer if no segmentation, or the last segment */
1707 {
1708 p_xmit = (BT_HDR *)GKI_dequeue (&p_ccb->xmit_hold_q);
1709
1710 if (p_xmit->event != 0)
1711 last_seg = TRUE;
1712
1713 p_xmit->event = p_ccb->local_cid;
1714 }
1715
1716 /* Step back to add the L2CAP headers */
1717 p_xmit->offset -= (L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD);
1718 p_xmit->len += L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD;
1719
1720 if (first_seg)
1721 {
1722 p_xmit->offset -= L2CAP_SDU_LEN_OVERHEAD;
1723 p_xmit->len += L2CAP_SDU_LEN_OVERHEAD;
1724 }
1725
1726 /* Set the pointer to the beginning of the data */
1727 p = (UINT8 *)(p_xmit + 1) + p_xmit->offset;
1728
1729 /* Now the L2CAP header */
1730
1731 /* Note: if FCS has to be included then the length is recalculated later */
1732 UINT16_TO_STREAM (p, p_xmit->len - L2CAP_PKT_OVERHEAD);
1733
1734 UINT16_TO_STREAM (p, p_ccb->remote_cid);
1735
1736 if (first_seg)
1737 {
1738 /* Skip control word and add SDU length */
1739 p += 2;
1740 UINT16_TO_STREAM (p, sdu_len);
1741
1742 /* We will store the SAR type in layer-specific */
1743 /* layer_specific is shared with flushable flag(bits 0-1), don't clear it */
1744 p_xmit->layer_specific |= L2CAP_FCR_START_SDU;
1745
1746 first_seg = FALSE;
1747 }
1748 else if (mid_seg)
1749 p_xmit->layer_specific |= L2CAP_FCR_CONT_SDU;
1750 else if (last_seg)
1751 p_xmit->layer_specific |= L2CAP_FCR_END_SDU;
1752 else
1753 p_xmit->layer_specific |= L2CAP_FCR_UNSEG_SDU;
1754
1755 prepare_I_frame (p_ccb, p_xmit, FALSE);
1756
1757 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE)
1758 {
1759 BT_HDR *p_wack = l2c_fcr_clone_buf (p_xmit, HCI_DATA_PREAMBLE_SIZE, p_xmit->len, p_ccb->ertm_info.fcr_tx_pool_id);
1760
1761 if (!p_wack)
1762 {
1763 L2CAP_TRACE_ERROR3 ("L2CAP - no buffer for xmit cloning, CID: 0x%04x Pool: %u Count: %u",
1764 p_ccb->local_cid, p_ccb->ertm_info.fcr_tx_pool_id, GKI_poolfreecount(p_ccb->ertm_info.fcr_tx_pool_id));
1765
1766 /* We will not save the FCS in case we reconfigure and change options */
1767 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS)
1768 p_xmit->len -= L2CAP_FCS_LEN;
1769
1770 /* Pretend we sent it and it got lost */
1771 GKI_enqueue (&p_ccb->fcrb.waiting_for_ack_q, p_xmit);
1772 return (NULL);
1773 }
1774 else
1775 {
1776 #if (L2CAP_ERTM_STATS == TRUE)
1777 /* set timestamp at the end of tx I-frame to get acking delay */
1778 p = ((UINT8 *) (p_wack+1)) + p_wack->offset + p_wack->len;
1779 UINT32_TO_STREAM (p, GKI_get_os_tick_count());
1780 #endif
1781 /* We will not save the FCS in case we reconfigure and change options */
1782 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS)
1783 p_wack->len -= L2CAP_FCS_LEN;
1784
1785 p_wack->layer_specific = p_xmit->layer_specific;
1786 GKI_enqueue (&p_ccb->fcrb.waiting_for_ack_q, p_wack);
1787 }
1788
1789 #if L2CAP_CORRUPT_ERTM_PKTS == TRUE
1790 {
1791 UINT16 ctrl_word;
1792 p = ((UINT8 *) (p_xmit+1)) + p_xmit->offset + L2CAP_PKT_OVERHEAD;
1793 STREAM_TO_UINT16 (ctrl_word, p);
1794
1795 /* Get out if packet was dropped; pretend it was sent */
1796 if (l2c_corrupt_the_fcr_packet (p_ccb, p_xmit, FALSE, ctrl_word))
1797 return (NULL);
1798 }
1799 #endif
1800 #if (L2CAP_ERTM_STATS == TRUE)
1801 p_ccb->fcrb.ertm_pkt_counts[0]++;
1802 p_ccb->fcrb.ertm_byte_counts[0] += (p_xmit->len - 8);
1803 #endif
1804
1805 }
1806
1807 return (p_xmit);
1808 }
1809
1810
1811 /*******************************************************************************
1812 ** Configuration negotiation functions
1813 **
1814 ** The following functions are used in negotiating channel modes during
1815 ** configuration
1816 ********************************************************************************/
1817
1818 /*******************************************************************************
1819 **
1820 ** Function l2c_fcr_chk_chan_modes
1821 **
1822 ** Description Validates and adjusts if necessary, the FCR options
1823 ** based on remote EXT features.
1824 **
1825 ** Note: This assumes peer EXT Features have been received.
1826 ** Basic mode is used if FCR Options have not been received
1827 **
1828 ** Returns UINT8 - nonzero if can continue, '0' if no compatible channels
1829 **
1830 *******************************************************************************/
l2c_fcr_chk_chan_modes(tL2C_CCB * p_ccb)1831 UINT8 l2c_fcr_chk_chan_modes (tL2C_CCB *p_ccb)
1832 {
1833 /* Remove nonbasic options that the peer does not support */
1834 if (!(p_ccb->p_lcb->peer_ext_fea & L2CAP_EXTFEA_ENH_RETRANS))
1835 p_ccb->ertm_info.allowed_modes &= ~L2CAP_FCR_CHAN_OPT_ERTM;
1836
1837 if (!(p_ccb->p_lcb->peer_ext_fea & L2CAP_EXTFEA_STREAM_MODE))
1838 p_ccb->ertm_info.allowed_modes &= ~L2CAP_FCR_CHAN_OPT_STREAM;
1839
1840 /* At least one type needs to be set (Basic, ERTM, STM) to continue */
1841 if (!p_ccb->ertm_info.allowed_modes)
1842 {
1843 L2CAP_TRACE_WARNING0 ("L2CAP - Peer does not support our desired channel types");
1844 }
1845
1846 return (p_ccb->ertm_info.allowed_modes);
1847 }
1848
1849 /*******************************************************************************
1850 **
1851 ** Function l2c_fcr_adj_our_req_options
1852 **
1853 ** Description Validates and sets up the FCR options passed in from
1854 ** L2CA_ConfigReq based on remote device's features.
1855 **
1856 ** Returns TRUE if no errors, Otherwise FALSE
1857 **
1858 *******************************************************************************/
l2c_fcr_adj_our_req_options(tL2C_CCB * p_ccb,tL2CAP_CFG_INFO * p_cfg)1859 BOOLEAN l2c_fcr_adj_our_req_options (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg)
1860 {
1861 tL2CAP_FCR_OPTS *p_fcr = &p_cfg->fcr;
1862
1863 if (p_fcr->mode != p_ccb->ertm_info.preferred_mode)
1864 {
1865 L2CAP_TRACE_WARNING2 ("l2c_fcr_adj_our_req_options - preferred_mode (%d), does not match mode (%d)",
1866 p_ccb->ertm_info.preferred_mode, p_fcr->mode);
1867
1868 /* The preferred mode is passed in through tL2CAP_ERTM_INFO, so override this one */
1869 p_fcr->mode = p_ccb->ertm_info.preferred_mode;
1870 }
1871
1872 /* If upper layer did not request eRTM mode, BASIC must be used */
1873 if (p_ccb->ertm_info.allowed_modes == L2CAP_FCR_CHAN_OPT_BASIC)
1874 {
1875 if (p_cfg->fcr_present && p_fcr->mode != L2CAP_FCR_BASIC_MODE)
1876 {
1877 L2CAP_TRACE_WARNING1 ("l2c_fcr_adj_our_req_options (mode %d): ERROR: No FCR options set using BASIC mode", p_fcr->mode);
1878 }
1879 p_fcr->mode = L2CAP_FCR_BASIC_MODE;
1880 }
1881
1882 /* Process the FCR options if initial channel bring-up (not a reconfig request)
1883 ** Determine initial channel mode to try based on our options and remote's features
1884 */
1885 if (p_cfg->fcr_present && !(p_ccb->config_done & RECONFIG_FLAG))
1886 {
1887 /* We need to have at least one mode type common with the peer */
1888 if (!l2c_fcr_chk_chan_modes(p_ccb))
1889 {
1890 /* Two channels have incompatible supported types */
1891 l2cu_disconnect_chnl (p_ccb);
1892 return (FALSE);
1893 }
1894
1895 /* Basic is the only common channel mode between the two devices */
1896 else if (p_ccb->ertm_info.allowed_modes == L2CAP_FCR_CHAN_OPT_BASIC)
1897 {
1898 /* We only want to try Basic, so bypass sending the FCR options entirely */
1899 p_cfg->fcr_present = FALSE;
1900 p_cfg->fcs_present = FALSE; /* Illegal to use FCS option in basic mode */
1901 p_cfg->ext_flow_spec_present = FALSE; /* Illegal to use extended flow spec in basic mode */
1902 }
1903
1904 /* We have at least one non-basic mode available
1905 * Override mode from available mode options based on preference, if needed
1906 */
1907 else
1908 {
1909 /* If peer does not support STREAMING, try ERTM */
1910 if (p_fcr->mode == L2CAP_FCR_STREAM_MODE && !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_STREAM))
1911 {
1912 L2CAP_TRACE_DEBUG0 ("L2C CFG: mode is STREAM, but peer does not support; Try ERTM");
1913 p_fcr->mode = L2CAP_FCR_ERTM_MODE;
1914 }
1915
1916 /* If peer does not support ERTM, try BASIC (will support this if made it here in the code) */
1917 if (p_fcr->mode == L2CAP_FCR_ERTM_MODE && !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM))
1918 {
1919 L2CAP_TRACE_DEBUG0 ("L2C CFG: mode is ERTM, but peer does not support; Try BASIC");
1920 p_fcr->mode = L2CAP_FCR_BASIC_MODE;
1921 }
1922 }
1923
1924 if (p_fcr->mode != L2CAP_FCR_BASIC_MODE)
1925 {
1926 /* MTU must be smaller than buffer size */
1927 if ( (p_cfg->mtu_present) && (p_cfg->mtu > p_ccb->max_rx_mtu) )
1928 {
1929 L2CAP_TRACE_WARNING2 ("L2CAP - MTU: %u larger than buf size: %u", p_cfg->mtu, p_ccb->max_rx_mtu);
1930 return (FALSE);
1931 }
1932
1933 /* application want to use the default MPS */
1934 if (p_fcr->mps == L2CAP_DEFAULT_ERM_MPS)
1935 {
1936 p_fcr->mps = L2CAP_MPS_OVER_BR_EDR;
1937 }
1938 /* MPS must be less than MTU */
1939 else if (p_fcr->mps > p_ccb->max_rx_mtu)
1940 {
1941 L2CAP_TRACE_WARNING2 ("L2CAP - MPS %u invalid MTU: %u", p_fcr->mps, p_ccb->max_rx_mtu);
1942 return (FALSE);
1943 }
1944
1945 /* We always initially read into the HCI buffer pool, so make sure it fits */
1946 if (p_fcr->mps > (L2CAP_MTU_SIZE - L2CAP_MAX_HEADER_FCS))
1947 p_fcr->mps = L2CAP_MTU_SIZE - L2CAP_MAX_HEADER_FCS;
1948 }
1949 else
1950 {
1951 p_cfg->fcs_present = FALSE; /* Illegal to use FCS option in basic mode */
1952 p_cfg->ext_flow_spec_present = FALSE; /* Illegal to use extended flow spec in basic mode */
1953 }
1954
1955 p_ccb->our_cfg.fcr = *p_fcr;
1956 }
1957 else /* Not sure how to send a reconfiguration(??) should fcr be included? */
1958 {
1959 p_ccb->our_cfg.fcr_present = FALSE;
1960 }
1961
1962 return (TRUE);
1963 }
1964
1965
1966 /*******************************************************************************
1967 **
1968 ** Function l2c_fcr_adj_monitor_retran_timeout
1969 **
1970 ** Description Overrides monitor/retrans timer value based on controller
1971 **
1972 ** Returns None
1973 **
1974 *******************************************************************************/
l2c_fcr_adj_monitor_retran_timeout(tL2C_CCB * p_ccb)1975 void l2c_fcr_adj_monitor_retran_timeout (tL2C_CCB *p_ccb)
1976 {
1977 /* adjust our monitor/retran timeout */
1978 if (p_ccb->out_cfg_fcr_present)
1979 {
1980 /*
1981 ** if we requestd ERTM or accepted ERTM
1982 ** We may accept ERTM even if we didn't request ERTM, in case of requesting STREAM
1983 */
1984 if ((p_ccb->our_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE)
1985 ||(p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE))
1986 {
1987 /* upper layer setting is ignored */
1988 p_ccb->our_cfg.fcr.mon_tout = L2CAP_MIN_MONITOR_TOUT;
1989 p_ccb->our_cfg.fcr.rtrans_tout = L2CAP_MIN_RETRANS_TOUT;
1990 }
1991 else
1992 {
1993 p_ccb->our_cfg.fcr.mon_tout = 0;
1994 p_ccb->our_cfg.fcr.rtrans_tout = 0;
1995 }
1996
1997 L2CAP_TRACE_DEBUG2 ("l2c_fcr_adj_monitor_retran_timeout: mon_tout:%d, rtrans_tout:%d",
1998 p_ccb->our_cfg.fcr.mon_tout, p_ccb->our_cfg.fcr.rtrans_tout);
1999 }
2000 }
2001 /*******************************************************************************
2002 **
2003 ** Function l2c_fcr_adj_our_rsp_options
2004 **
2005 ** Description Overrides any neccesary FCR options passed in from
2006 ** L2CA_ConfigRsp based on our FCR options.
2007 ** Only makes adjustments if channel is in ERTM mode.
2008 **
2009 ** Returns None
2010 **
2011 *******************************************************************************/
l2c_fcr_adj_our_rsp_options(tL2C_CCB * p_ccb,tL2CAP_CFG_INFO * p_cfg)2012 void l2c_fcr_adj_our_rsp_options (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg)
2013 {
2014 /* adjust our monitor/retran timeout */
2015 l2c_fcr_adj_monitor_retran_timeout(p_ccb);
2016
2017 p_cfg->fcr_present = p_ccb->out_cfg_fcr_present;
2018
2019 if (p_cfg->fcr_present)
2020 {
2021 // btla-specific ++
2022 /* Temporary - until a better algorithm is implemented */
2023 /* If peer's tx_wnd_sz requires too many buffers for us to support, then adjust it. For now, respond with our own tx_wnd_sz. */
2024 /* Note: peer is not guaranteed to obey our adjustment */
2025 if (p_ccb->peer_cfg.fcr.tx_win_sz > p_ccb->our_cfg.fcr.tx_win_sz)
2026 {
2027 L2CAP_TRACE_DEBUG3 ("%s: adjusting requested tx_win_sz from %i to %i", __FUNCTION__, p_ccb->peer_cfg.fcr.tx_win_sz, p_ccb->our_cfg.fcr.tx_win_sz);
2028 p_ccb->peer_cfg.fcr.tx_win_sz = p_ccb->our_cfg.fcr.tx_win_sz;
2029 }
2030 // btla-specific --
2031
2032 p_cfg->fcr.mode = p_ccb->peer_cfg.fcr.mode;
2033 p_cfg->fcr.tx_win_sz = p_ccb->peer_cfg.fcr.tx_win_sz;
2034 p_cfg->fcr.max_transmit = p_ccb->peer_cfg.fcr.max_transmit;
2035 p_cfg->fcr.mps = p_ccb->peer_cfg.fcr.mps;
2036 p_cfg->fcr.rtrans_tout = p_ccb->our_cfg.fcr.rtrans_tout;
2037 p_cfg->fcr.mon_tout = p_ccb->our_cfg.fcr.mon_tout;
2038 }
2039 }
2040
2041 /*******************************************************************************
2042 **
2043 ** Function l2c_fcr_renegotiate_chan
2044 **
2045 ** Description Called upon unsuccessful peer response to config request.
2046 ** If the error is because of the channel mode, it will try
2047 ** to resend using another supported optional channel.
2048 **
2049 ** Returns TRUE if resent configuration, False if channel matches or
2050 ** cannot match.
2051 **
2052 *******************************************************************************/
l2c_fcr_renegotiate_chan(tL2C_CCB * p_ccb,tL2CAP_CFG_INFO * p_cfg)2053 BOOLEAN l2c_fcr_renegotiate_chan(tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg)
2054 {
2055 UINT8 peer_mode = p_ccb->our_cfg.fcr.mode;
2056 BOOLEAN can_renegotiate;
2057
2058 /* Skip if this is a reconfiguration from OPEN STATE or if FCR is not returned */
2059 if (!p_cfg->fcr_present || (p_ccb->config_done & RECONFIG_FLAG))
2060 return (FALSE);
2061
2062 /* Only retry if there are more channel options to try */
2063 if (p_cfg->result == L2CAP_CFG_UNACCEPTABLE_PARAMS)
2064 {
2065 peer_mode = (p_cfg->fcr_present) ? p_cfg->fcr.mode : L2CAP_FCR_BASIC_MODE;
2066
2067 if (p_ccb->our_cfg.fcr.mode != peer_mode)
2068 {
2069
2070 if ((--p_ccb->fcr_cfg_tries) == 0)
2071 {
2072 p_cfg->result = L2CAP_CFG_FAILED_NO_REASON;
2073 L2CAP_TRACE_WARNING0 ("l2c_fcr_renegotiate_chan (Max retries exceeded)");
2074 }
2075
2076 can_renegotiate = FALSE;
2077
2078 /* Try another supported mode if available based on our last attempted channel */
2079 switch (p_ccb->our_cfg.fcr.mode)
2080 {
2081 /* Our Streaming mode request was unnacceptable; try ERTM or Basic */
2082 case L2CAP_FCR_STREAM_MODE:
2083 /* Peer wants ERTM and we support it */
2084 if ( (peer_mode == L2CAP_FCR_ERTM_MODE) && (p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM) )
2085 {
2086 L2CAP_TRACE_DEBUG0 ("l2c_fcr_renegotiate_chan(Trying ERTM)");
2087 p_ccb->our_cfg.fcr.mode = L2CAP_FCR_ERTM_MODE;
2088 can_renegotiate = TRUE;
2089 }
2090 else /* Falls through */
2091
2092 case L2CAP_FCR_ERTM_MODE:
2093 {
2094 /* We can try basic for any other peer mode if we support it */
2095 if (p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_BASIC)
2096 {
2097 L2CAP_TRACE_DEBUG0 ("l2c_fcr_renegotiate_chan(Trying Basic)");
2098 can_renegotiate = TRUE;
2099 p_ccb->our_cfg.fcr.mode = L2CAP_FCR_BASIC_MODE;
2100 }
2101 }
2102 break;
2103
2104 default:
2105 /* All other scenarios cannot be renegotiated */
2106 break;
2107 }
2108
2109 if (can_renegotiate)
2110 {
2111 p_ccb->our_cfg.fcr_present = TRUE;
2112
2113 if (p_ccb->our_cfg.fcr.mode == L2CAP_FCR_BASIC_MODE)
2114 {
2115 p_ccb->our_cfg.fcs_present = FALSE;
2116 p_ccb->our_cfg.ext_flow_spec_present = FALSE;
2117
2118 /* Basic Mode uses ACL Data Pool, make sure the MTU fits */
2119 if ( (p_cfg->mtu_present) && (p_cfg->mtu > L2CAP_MTU_SIZE) )
2120 {
2121 L2CAP_TRACE_WARNING1 ("L2CAP - adjust MTU: %u too large", p_cfg->mtu);
2122 p_cfg->mtu = L2CAP_MTU_SIZE;
2123 }
2124 }
2125
2126 l2cu_process_our_cfg_req (p_ccb, &p_ccb->our_cfg);
2127 l2cu_send_peer_config_req (p_ccb, &p_ccb->our_cfg);
2128 btu_start_timer (&p_ccb->timer_entry, BTU_TTYPE_L2CAP_CHNL, L2CAP_CHNL_CFG_TIMEOUT);
2129 return (TRUE);
2130 }
2131 }
2132 }
2133
2134 /* Disconnect if the channels do not match */
2135 if (p_ccb->our_cfg.fcr.mode != peer_mode)
2136 {
2137 L2CAP_TRACE_WARNING2 ("L2C CFG: Channels incompatible (local %d, peer %d)",
2138 p_ccb->our_cfg.fcr.mode, peer_mode);
2139 l2cu_disconnect_chnl (p_ccb);
2140 }
2141
2142 return (FALSE);
2143 }
2144
2145
2146 /*******************************************************************************
2147 **
2148 ** Function l2c_fcr_process_peer_cfg_req
2149 **
2150 ** Description This function is called to process the FCR options passed
2151 ** in the peer's configuration request.
2152 **
2153 ** Returns UINT8 - L2CAP_PEER_CFG_OK, L2CAP_PEER_CFG_UNACCEPTABLE,
2154 ** or L2CAP_PEER_CFG_DISCONNECT.
2155 **
2156 *******************************************************************************/
l2c_fcr_process_peer_cfg_req(tL2C_CCB * p_ccb,tL2CAP_CFG_INFO * p_cfg)2157 UINT8 l2c_fcr_process_peer_cfg_req(tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg)
2158 {
2159 UINT16 max_retrans_size;
2160 UINT8 fcr_ok = L2CAP_PEER_CFG_OK;
2161
2162 p_ccb->p_lcb->w4_info_rsp = FALSE; /* Handles T61x SonyEricsson Bug in Info Request */
2163
2164 L2CAP_TRACE_EVENT5 ("l2c_fcr_process_peer_cfg_req() CFG fcr_present:%d fcr.mode:%d CCB FCR mode:%d preferred: %u allowed:%u",
2165 p_cfg->fcr_present, p_cfg->fcr.mode, p_ccb->our_cfg.fcr.mode, p_ccb->ertm_info.preferred_mode,
2166 p_ccb->ertm_info.allowed_modes);
2167
2168 /* If Peer wants basic, we are done (accept it or disconnect) */
2169 if (p_cfg->fcr.mode == L2CAP_FCR_BASIC_MODE)
2170 {
2171 /* If we do not allow basic, disconnect */
2172 if ( !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_BASIC) )
2173 fcr_ok = L2CAP_PEER_CFG_DISCONNECT;
2174 }
2175
2176 /* Need to negotiate if our modes are not the same */
2177 else if (p_cfg->fcr.mode != p_ccb->ertm_info.preferred_mode)
2178 {
2179 /* If peer wants a mode that we don't support then retry our mode (ex. rtx/flc), OR
2180 ** If we want ERTM and they wanted streaming retry our mode.
2181 ** Note: If we have already determined they support our mode previously
2182 ** from their EXF mask.
2183 */
2184 if ( (((1 << p_cfg->fcr.mode) & L2CAP_FCR_CHAN_OPT_ALL_MASK) == 0)
2185 || (p_ccb->ertm_info.preferred_mode == L2CAP_FCR_ERTM_MODE) )
2186 {
2187 p_cfg->fcr.mode = p_ccb->our_cfg.fcr.mode;
2188 p_cfg->fcr.tx_win_sz = p_ccb->our_cfg.fcr.tx_win_sz;
2189 p_cfg->fcr.max_transmit = p_ccb->our_cfg.fcr.max_transmit;
2190 fcr_ok = L2CAP_PEER_CFG_UNACCEPTABLE;
2191 }
2192
2193 /* If we wanted basic, then try to renegotiate it */
2194 else if (p_ccb->ertm_info.preferred_mode == L2CAP_FCR_BASIC_MODE)
2195 {
2196 p_cfg->fcr.mode = L2CAP_FCR_BASIC_MODE;
2197 p_cfg->fcr.max_transmit = p_cfg->fcr.tx_win_sz = 0;
2198 p_cfg->fcr.rtrans_tout = p_cfg->fcr.mon_tout = p_cfg->fcr.mps = 0;
2199 p_ccb->our_cfg.fcr.rtrans_tout = p_ccb->our_cfg.fcr.mon_tout = p_ccb->our_cfg.fcr.mps = 0;
2200 fcr_ok = L2CAP_PEER_CFG_UNACCEPTABLE;
2201 }
2202
2203 /* Only other valid case is if they want ERTM and we wanted STM which should be
2204 accepted if we support it; otherwise the channel should be disconnected */
2205 else if ( (p_cfg->fcr.mode != L2CAP_FCR_ERTM_MODE)
2206 || !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM) )
2207 {
2208 fcr_ok = L2CAP_PEER_CFG_DISCONNECT;
2209 }
2210 }
2211
2212 /* Configuration for FCR channels so make any adjustments and fwd to upper layer */
2213 if (fcr_ok == L2CAP_PEER_CFG_OK)
2214 {
2215 /* by default don't need to send params in the response */
2216 p_ccb->out_cfg_fcr_present = FALSE;
2217
2218 /* Make any needed adjustments for the response to the peer */
2219 if (p_cfg->fcr_present && p_cfg->fcr.mode != L2CAP_FCR_BASIC_MODE)
2220 {
2221 /* Peer desires to bypass FCS check, and streaming or ERTM mode */
2222 if (p_cfg->fcs_present)
2223 {
2224 p_ccb->peer_cfg.fcs = p_cfg->fcs;
2225 p_ccb->peer_cfg_bits |= L2CAP_CH_CFG_MASK_FCS;
2226 if( p_cfg->fcs == L2CAP_CFG_FCS_BYPASS)
2227 p_ccb->bypass_fcs |= L2CAP_CFG_FCS_PEER;
2228 }
2229
2230 max_retrans_size = GKI_get_pool_bufsize (p_ccb->ertm_info.fcr_tx_pool_id) - sizeof(BT_HDR)
2231 - L2CAP_MIN_OFFSET - L2CAP_SDU_LEN_OFFSET - L2CAP_FCS_LEN;
2232
2233 /* Ensure the MPS is not bigger than the MTU */
2234 if ( (p_cfg->fcr.mps == 0) || (p_cfg->fcr.mps > p_ccb->peer_cfg.mtu) )
2235 {
2236 p_cfg->fcr.mps = p_ccb->peer_cfg.mtu;
2237 p_ccb->out_cfg_fcr_present = TRUE;
2238 }
2239
2240 /* Ensure the MPS is not bigger than our retransmission buffer */
2241 if (p_cfg->fcr.mps > max_retrans_size)
2242 {
2243 L2CAP_TRACE_DEBUG2("CFG: Overriding MPS to %d (orig %d)", max_retrans_size, p_cfg->fcr.mps);
2244
2245 p_cfg->fcr.mps = max_retrans_size;
2246 p_ccb->out_cfg_fcr_present = TRUE;
2247 }
2248
2249 if (p_cfg->fcr.mode == L2CAP_FCR_ERTM_MODE)
2250 {
2251 /* Always respond with FCR ERTM parameters */
2252 p_ccb->out_cfg_fcr_present = TRUE;
2253 }
2254 }
2255
2256 /* Everything ok, so save the peer's adjusted fcr options */
2257 p_ccb->peer_cfg.fcr = p_cfg->fcr;
2258
2259 if (p_cfg->fcr_present)
2260 p_ccb->peer_cfg_bits |= L2CAP_CH_CFG_MASK_FCR;
2261 }
2262 else if (fcr_ok == L2CAP_PEER_CFG_UNACCEPTABLE)
2263 {
2264 /* Allow peer only one retry for mode */
2265 if (p_ccb->peer_cfg_already_rejected)
2266 fcr_ok = L2CAP_PEER_CFG_DISCONNECT;
2267 else
2268 p_ccb->peer_cfg_already_rejected = TRUE;
2269 }
2270
2271 return (fcr_ok);
2272 }
2273
2274
2275 #if L2CAP_CORRUPT_ERTM_PKTS == TRUE
2276 /*******************************************************************************
2277 ** Functions used for testing ERTM mode
2278 */
2279 /* If FALSE, will also corrupt cid, length, control word, etc. */
2280 #ifndef L2CAP_CORR_FCS_ONLY
2281 #define L2CAP_CORR_FCS_ONLY TRUE
2282 #endif
2283
2284 #define L2C_DISP_FRAME_SIZE 16
2285 /*******************************************************************************
2286 **
2287 ** Function l2c_corrupt_the_fcr_packet
2288 **
2289 ** Description This function is used for testing purposes only.
2290 ** It systematically or randomly corrupts packets used with
2291 ** ERTM channels.
2292 **
2293 ** Returns BOOLEAN TRUE if packet was dropped,
2294 ** FALSE if fcs corrupted or no corruption
2295 **
2296 *******************************************************************************/
l2c_corrupt_the_fcr_packet(tL2C_CCB * p_ccb,BT_HDR * p_buf,BOOLEAN is_rx,UINT16 ctrl_word)2297 static BOOLEAN l2c_corrupt_the_fcr_packet (tL2C_CCB *p_ccb, BT_HDR *p_buf,
2298 BOOLEAN is_rx, UINT16 ctrl_word)
2299 {
2300 tL2C_FCR_TEST_CFG *p_cfg;
2301 UINT32 tc;
2302 UINT8 *p;
2303 UINT32 xx;
2304 char buf[L2C_DISP_FRAME_SIZE];
2305
2306 if (!p_ccb || !p_ccb->fcrb.test_cb.cfg.in_use)
2307 return FALSE;
2308
2309 /* Prepare bad FCS */
2310 p = ((UINT8 *) (p_buf + 1)) + p_buf->offset;
2311 tc = GKI_get_os_tick_count();
2312 tc ^= p[p_buf->len - 1];
2313 xx = tc % 47;
2314
2315 p_cfg = &p_ccb->fcrb.test_cb.cfg;
2316 #if 0
2317 L2CAP_TRACE_DEBUG4 ("testcfg: type: %d, freq: %d (NRM-0, RDM-1), is_rx: %d, count: %d",
2318 p_cfg->type, p_cfg->freq, p_cfg->is_rx, p_cfg->count);
2319 #endif
2320 /* If not time to corrupt get out */
2321 if (p_cfg->freq == L2CAP_FCR_FREQ_RANDOM)
2322 {
2323 if (xx != 0)
2324 return FALSE;
2325 }
2326 else /* check test criteria before corrupting */
2327 {
2328 if ( (p_cfg->count == 0)
2329 || (p_cfg->is_rx != is_rx)
2330 || ((UINT8)(ctrl_word & L2CAP_FCR_S_FRAME_BIT) != p_cfg->type) )
2331 {
2332 return FALSE;
2333 }
2334
2335 /* Turn off if done */
2336 if (--(p_cfg->count) == 0)
2337 {
2338 p_ccb->fcrb.test_cb.cfg.in_use = FALSE;
2339 }
2340 }
2341
2342 #if L2CAP_CORR_FCS_ONLY == TRUE
2343 /* Corrupt the FCS check */
2344 p[p_buf->len - 1] = p[p_buf->len - 2] = 0;
2345 #else
2346 /* If made it this far packet needs to be corrupted */
2347 xx = tc % p_buf->len;
2348
2349 /* Make sure the value was changed */
2350 if (p[xx + 1] == 0)
2351 p[xx + 1] = 0x5A;
2352
2353 p[xx] = p[xx] ^ p[xx + 1];
2354
2355 #if 1 /* Enable if not wishing to corrupting frame type */
2356 {
2357 UINT8 *p_temp = ((UINT8 *) (p_buf + 1)) + p_buf->offset;
2358 p_temp += L2CAP_PKT_OVERHEAD;
2359 if ((UINT16)((*p_temp) & 0x01) != (ctrl_word & 0x0001))
2360 {
2361 (*p_temp) |= (UINT8)(ctrl_word & 0x0001);
2362 }
2363 }
2364 #endif
2365 #endif
2366
2367 if (is_rx)
2368 {
2369 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT)
2370 BCM_STRCPY_S(buf, L2C_DISP_FRAME_SIZE, "Rx S-Frame");
2371 else
2372 BCM_STRCPY_S(buf, L2C_DISP_FRAME_SIZE, "Rx I-Frame");
2373 }
2374 else
2375 {
2376 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT)
2377 BCM_STRCPY_S(buf, L2C_DISP_FRAME_SIZE, "Tx S-Frame");
2378 else
2379 BCM_STRCPY_S(buf, L2C_DISP_FRAME_SIZE, "Tx I-Frame");
2380 }
2381
2382 /* Lastly, just drop packet if FCS is not being used or if Tx */
2383 if (!is_rx || p_ccb->bypass_fcs == L2CAP_BYPASS_FCS)
2384 {
2385 L2CAP_TRACE_ERROR6 ("-=-=-=-=-=-=-=- Dropping %s packet (0x%04x) tc: %u Buf Len: %u xx: %u count: %d",
2386 buf, (UINT32)p_buf, tc, p_buf->len, xx, p_cfg->count);
2387 GKI_freebuf(p_buf);
2388 return TRUE;
2389 }
2390 else
2391 {
2392 L2CAP_TRACE_ERROR6 ("-=-=-=-=-=-=-=- Corrupting %s packet (0x%04x) tc: %u Buf Len: %u xx: %u count: %d",
2393 buf, (UINT32)p_buf, tc, p_buf->len, xx, p_cfg->count);
2394 }
2395
2396 return FALSE;
2397 }
2398
2399
2400 /*******************************************************************************
2401 **
2402 ** Function L2CA_SetupErtmTest
2403 **
2404 ** Description This function is used for testing purposes only.
2405 ** It corrupts or drops one or more packets used with ERTM channels.
2406 **
2407 ** Parameters
2408 ** cid - channel ID (0 uses RFCOMM PSM's CID)
2409 **
2410 ** type - type of test to run (L2CAP_FCR_TTYPE_CORR_IFRAMES
2411 ** L2CAP_FCR_TTYPE_CORR_SFRAME
2412 ** L2CAP_FCR_TTYPE_STOP_TEST
2413 ** L2CAP_FCR_TTYPE_GET_CID - returns rfcomm cid only)
2414 **
2415 ** is_rx - TRUE to corrupt Rx packet, FALSE for Tx packet)
2416 **
2417 ** freq - L2CAP_FCR_FREQ_RANDOM (turns on random corruptions/drops)
2418 ** L2CAP_FCR_FREQ_NORMAL (turns on test with "count" corruptions/drops)
2419 **
2420 ** count - number of packets in a row to drop or corrupt
2421 **
2422 ** Returns CID of channel running test
2423 **
2424 *******************************************************************************/
L2CA_SetupErtmTest(UINT16 cid,UINT8 type,BOOLEAN is_rx,UINT8 freq,UINT16 count)2425 UINT16 L2CA_SetupErtmTest (UINT16 cid, UINT8 type, BOOLEAN is_rx, UINT8 freq, UINT16 count)
2426 {
2427 tL2C_CCB *p_ccb = NULL;
2428 tL2C_CCB *p_temp_ccb;
2429 tL2C_FCR_TEST_CB *p_test_cb;
2430 UINT16 xx;
2431
2432 /* If '0' tests run on top of RFCOMM CID if active */
2433 if (cid == 0)
2434 {
2435 p_temp_ccb = l2cb.ccb_pool;
2436 for (xx = 0; xx < MAX_L2CAP_CHANNELS; xx++, p_temp_ccb++)
2437 {
2438 /* Fixed channels don't have p_rcb's */
2439 if (p_temp_ccb->in_use && p_temp_ccb->p_rcb && p_temp_ccb->p_rcb->psm == BT_PSM_RFCOMM)
2440 {
2441 p_ccb = p_temp_ccb;
2442 cid = L2CAP_BASE_APPL_CID + xx;
2443 break;
2444 }
2445 }
2446 }
2447 else
2448 p_ccb = l2cu_find_ccb_by_cid (NULL, cid);
2449
2450 if (!p_ccb || type == L2CAP_FCR_TTYPE_GET_CID)
2451 {
2452 if (type == L2CAP_FCR_TTYPE_GET_CID)
2453 {
2454 L2CAP_TRACE_API1 ("L2CA_SetupErtmTest (GET_CID): cid = 0x%04x", cid);
2455 }
2456 return (cid);
2457 }
2458
2459 p_test_cb = &p_ccb->fcrb.test_cb;
2460
2461 /* Turn off the current test */
2462 if (type == L2CAP_FCR_TTYPE_STOP_TEST)
2463 {
2464 if (p_test_cb->cfg.in_use)
2465 {
2466 L2CAP_TRACE_ERROR1 ("L2CA_SetupErtmTest (OFF): cid 0x%04x", cid);
2467 }
2468 p_test_cb->cfg.in_use = FALSE;
2469 p_test_cb->cfg.count = 0;
2470 }
2471
2472 /* Process the new request */
2473 else if (!p_test_cb->cfg.in_use)
2474 {
2475 /* count must be positive unless random is used */
2476 if (!count && freq != L2CAP_FCR_FREQ_RANDOM)
2477 {
2478 L2CAP_TRACE_ERROR1 ("L2CA_SetupErtmTest (FAIL): Count = 0, freq = %d", freq);
2479 return (cid);
2480 }
2481
2482 L2CAP_TRACE_ERROR5 ("L2CA_SetupErtmTest (START): cid 0x%04x, type %d, is_rx %d, freq %d, count %d",
2483 cid, type, is_rx, freq, count);
2484
2485 p_test_cb->cfg.in_use = TRUE;
2486 p_test_cb->cfg.freq = freq;
2487 p_test_cb->cfg.type = type;
2488 p_test_cb->cfg.is_rx = is_rx;
2489 p_test_cb->cfg.count = count;
2490 }
2491 else /* Test already in progress so ignore */
2492 {
2493 L2CAP_TRACE_ERROR5 ("L2CA_SetupErtmTest (ignoring): cid 0x%04x, type %d, is_rx %d, freq %d, count %d",
2494 cid, type, is_rx, freq, count);
2495 }
2496
2497 return (cid);
2498 }
2499
2500
2501 /*******************************************************************************
2502 ** The following routines are only used in conjunction with Conformance testing
2503 ********************************************************************************/
2504
2505 /*******************************************************************************
2506 **
2507 ** Function L2CA_SendPolledSFrame
2508 **
2509 ** Description This function is used for testing purposes only.
2510 ** It Sends a Polled RR or RNR to the peer
2511 **
2512 ** Parameters
2513 ** cid - channel ID
2514 **
2515 ** sup_type - (L2CAP_FCR_SUP_RR or L2CAP_FCR_SUP_RNR)
2516 **
2517 ** Returns void
2518 **
2519 *******************************************************************************/
L2CA_SendPolledSFrame(UINT16 cid,UINT16 sup_type)2520 void L2CA_SendPolledSFrame (UINT16 cid, UINT16 sup_type)
2521 {
2522 tL2C_CCB *p_ccb = l2cu_find_ccb_by_cid (NULL, cid);
2523
2524 if (p_ccb && (sup_type == L2CAP_FCR_SUP_RR || sup_type == L2CAP_FCR_SUP_RNR))
2525 {
2526 l2c_fcr_send_S_frame (p_ccb, sup_type, L2CAP_FCR_P_BIT);
2527 }
2528 else
2529 {
2530 L2CAP_TRACE_ERROR2 ("L2CA_SendPolledSFrame(ERROR): sup_type %u, p_ccb 0x%07x",
2531 sup_type, (UINT32)p_ccb);
2532 }
2533 }
2534
2535 /*******************************************************************************
2536 **
2537 ** Function l2c_bypass_sframe_packet
2538 **
2539 ** Description This function is used for testing purposes only.
2540 ** It returns TRUE if S-Frame should be bypassed.
2541 **
2542 ** Returns void
2543 **
2544 *******************************************************************************/
l2c_bypass_sframe_packet(tL2C_CCB * p_ccb)2545 static BOOLEAN l2c_bypass_sframe_packet (tL2C_CCB *p_ccb)
2546 {
2547 if (p_ccb && p_ccb->fcrb.test_cb.cfm.in_use)
2548 {
2549 if (p_ccb->fcrb.test_cb.cfm.skip_sframe_count > 0)
2550 {
2551 L2CAP_TRACE_ERROR1 ("l2c_bypass_sframe_packet (count %d)",
2552 p_ccb->fcrb.test_cb.cfm.skip_sframe_count);
2553
2554 if (--p_ccb->fcrb.test_cb.cfm.skip_sframe_count == 0)
2555 p_ccb->fcrb.test_cb.cfm.in_use = FALSE;
2556
2557 /* Bypass sending S-Frame */
2558 return TRUE;
2559 }
2560 else
2561 p_ccb->fcrb.test_cb.cfm.in_use = FALSE;
2562 }
2563
2564 return FALSE;
2565 }
2566
2567 /*******************************************************************************
2568 **
2569 ** Function L2CA_BypassSFrame
2570 **
2571 ** Description This function is used for testing purposes only.
2572 ** It skips sending 'count' S-Frames.
2573 **
2574 ** Parameters
2575 ** cid - channel ID
2576 **
2577 ** count - Number of S-Frames to skip sending
2578 **
2579 ** Returns void
2580 **
2581 *******************************************************************************/
L2CA_BypassSFrame(UINT16 cid,UINT8 count)2582 void L2CA_BypassSFrame (UINT16 cid, UINT8 count)
2583 {
2584 tL2C_CCB *p_ccb = l2cu_find_ccb_by_cid (NULL, cid);
2585 tL2C_FCR_CFM_TEST_CB *p_test_cb;
2586
2587 if (!p_ccb)
2588 {
2589 L2CAP_TRACE_WARNING1 ("L2CA_BypassSFrame(ERROR): no p_ccb (0x%07x)", (UINT32)p_ccb);
2590 return;
2591 }
2592
2593 p_test_cb = &p_ccb->fcrb.test_cb.cfm;
2594
2595 /* Initiate test if not active */
2596 if (!p_test_cb->in_use)
2597 {
2598 p_test_cb->in_use = TRUE;
2599 p_test_cb->skip_sframe_count = count;
2600 }
2601 else
2602 {
2603 L2CAP_TRACE_WARNING0 ("L2CA_BypassSFrame(ERROR): already in use (ignoring...)");
2604 }
2605 }
2606
2607 #endif /* L2CAP_CORRUPT_ERTM_PKTS == TRUE */
2608
2609 #if (L2CAP_ERTM_STATS == TRUE)
2610 /*******************************************************************************
2611 **
2612 ** Function l2c_fcr_collect_ack_delay
2613 **
2614 ** Description collect throughput, delay, queue size of waiting ack
2615 **
2616 ** Parameters
2617 ** tL2C_CCB
2618 **
2619 ** Returns void
2620 **
2621 *******************************************************************************/
l2c_fcr_collect_ack_delay(tL2C_CCB * p_ccb,UINT8 num_bufs_acked)2622 static void l2c_fcr_collect_ack_delay (tL2C_CCB *p_ccb, UINT8 num_bufs_acked)
2623 {
2624 UINT32 index;
2625 BT_HDR *p_buf;
2626 UINT8 *p;
2627 UINT32 timestamp, delay;
2628 UINT8 xx;
2629 UINT8 str[120];
2630
2631 index = p_ccb->fcrb.ack_delay_avg_index;
2632
2633 /* update sum, max and min of waiting for ack queue size */
2634 p_ccb->fcrb.ack_q_count_avg[index] += p_ccb->fcrb.waiting_for_ack_q.count;
2635
2636 if ( p_ccb->fcrb.waiting_for_ack_q.count > p_ccb->fcrb.ack_q_count_max[index] )
2637 p_ccb->fcrb.ack_q_count_max[index] = p_ccb->fcrb.waiting_for_ack_q.count;
2638
2639 if ( p_ccb->fcrb.waiting_for_ack_q.count < p_ccb->fcrb.ack_q_count_min[index] )
2640 p_ccb->fcrb.ack_q_count_min[index] = p_ccb->fcrb.waiting_for_ack_q.count;
2641
2642 /* update sum, max and min of round trip delay of acking */
2643 p_buf = (BT_HDR *)(p_ccb->fcrb.waiting_for_ack_q.p_first);
2644 for (xx = 0; (xx < num_bufs_acked)&&(p_buf); xx++)
2645 {
2646 /* adding up length of acked I-frames to get throughput */
2647 p_ccb->fcrb.throughput[index] += p_buf->len - 8;
2648
2649 if ( xx == num_bufs_acked - 1 )
2650 {
2651 /* get timestamp from tx I-frame that receiver is acking */
2652 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + p_buf->len;
2653 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS)
2654 {
2655 p += L2CAP_FCS_LEN;
2656 }
2657
2658 STREAM_TO_UINT32 (timestamp, p);
2659 delay = GKI_get_os_tick_count() - timestamp;
2660
2661 p_ccb->fcrb.ack_delay_avg[index] += delay;
2662 if ( delay > p_ccb->fcrb.ack_delay_max[index] )
2663 p_ccb->fcrb.ack_delay_max[index] = delay;
2664 if ( delay < p_ccb->fcrb.ack_delay_min[index] )
2665 p_ccb->fcrb.ack_delay_min[index] = delay;
2666 }
2667
2668 p_buf = GKI_getnext(p_buf);
2669 }
2670
2671 p_ccb->fcrb.ack_delay_avg_count++;
2672
2673 /* calculate average and initialize next avg, min and max */
2674 if (p_ccb->fcrb.ack_delay_avg_count > L2CAP_ERTM_STATS_AVG_NUM_SAMPLES)
2675 {
2676 p_ccb->fcrb.ack_delay_avg_count = 0;
2677
2678 p_ccb->fcrb.ack_q_count_avg[index] /= L2CAP_ERTM_STATS_AVG_NUM_SAMPLES;
2679 p_ccb->fcrb.ack_delay_avg[index] /= L2CAP_ERTM_STATS_AVG_NUM_SAMPLES;
2680
2681 /* calculate throughput */
2682 timestamp = GKI_get_os_tick_count();
2683 if (timestamp - p_ccb->fcrb.throughput_start > 0 )
2684 p_ccb->fcrb.throughput[index] /= (timestamp - p_ccb->fcrb.throughput_start);
2685
2686 p_ccb->fcrb.throughput_start = timestamp;
2687
2688 sprintf(str, "[%02u] throughput: %5u, ack_delay avg:%3u, min:%3u, max:%3u, ack_q_count avg:%3u, min:%3u, max:%3u",
2689 index, p_ccb->fcrb.throughput[index],
2690 p_ccb->fcrb.ack_delay_avg[index], p_ccb->fcrb.ack_delay_min[index], p_ccb->fcrb.ack_delay_max[index],
2691 p_ccb->fcrb.ack_q_count_avg[index], p_ccb->fcrb.ack_q_count_min[index], p_ccb->fcrb.ack_q_count_max[index] );
2692
2693 BT_TRACE_1(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", str);
2694
2695 index = (index + 1) % L2CAP_ERTM_STATS_NUM_AVG;
2696 p_ccb->fcrb.ack_delay_avg_index = index;
2697
2698 p_ccb->fcrb.ack_q_count_max[index] = 0;
2699 p_ccb->fcrb.ack_q_count_min[index] = 0xFFFFFFFF;
2700 p_ccb->fcrb.ack_q_count_avg[index] = 0;
2701
2702
2703 p_ccb->fcrb.ack_delay_max[index] = 0;
2704 p_ccb->fcrb.ack_delay_min[index] = 0xFFFFFFFF;
2705 p_ccb->fcrb.ack_delay_avg[index] = 0;
2706
2707 p_ccb->fcrb.throughput[index] = 0;
2708 }
2709 }
2710 #endif
2711
2712
2713
2714