1 /******************************************************************************
3 * Copyright (C) 2004-2012 Broadcom Corporation
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:
9 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 ******************************************************************************/
19 /******************************************************************************
21 * This file contains the L2CAP 1.2 Flow Control and retransmissions
24 ******************************************************************************/
38 #include "allocator.h"
40 #if (CLASSIC_BT_INCLUDED == TRUE)
42 /* Flag passed to retransmit_i_frames() when all packets should be retransmitted */
43 #define L2C_FCR_RETX_ALL_PKTS 0xFF
45 #if BT_TRACE_VERBOSE == TRUE
46 static char *SAR_types[] = { "Unsegmented", "Start", "End", "Continuation" };
47 static char *SUP_types[] = { "RR", "REJ", "RNR", "SREJ" };
50 /* Look-up table for the CRC calculation */
51 static const unsigned short crctab[256] = {
52 0x0000, 0xc0c1, 0xc181, 0x0140, 0xc301, 0x03c0, 0x0280, 0xc241,
53 0xc601, 0x06c0, 0x0780, 0xc741, 0x0500, 0xc5c1, 0xc481, 0x0440,
54 0xcc01, 0x0cc0, 0x0d80, 0xcd41, 0x0f00, 0xcfc1, 0xce81, 0x0e40,
55 0x0a00, 0xcac1, 0xcb81, 0x0b40, 0xc901, 0x09c0, 0x0880, 0xc841,
56 0xd801, 0x18c0, 0x1980, 0xd941, 0x1b00, 0xdbc1, 0xda81, 0x1a40,
57 0x1e00, 0xdec1, 0xdf81, 0x1f40, 0xdd01, 0x1dc0, 0x1c80, 0xdc41,
58 0x1400, 0xd4c1, 0xd581, 0x1540, 0xd701, 0x17c0, 0x1680, 0xd641,
59 0xd201, 0x12c0, 0x1380, 0xd341, 0x1100, 0xd1c1, 0xd081, 0x1040,
60 0xf001, 0x30c0, 0x3180, 0xf141, 0x3300, 0xf3c1, 0xf281, 0x3240,
61 0x3600, 0xf6c1, 0xf781, 0x3740, 0xf501, 0x35c0, 0x3480, 0xf441,
62 0x3c00, 0xfcc1, 0xfd81, 0x3d40, 0xff01, 0x3fc0, 0x3e80, 0xfe41,
63 0xfa01, 0x3ac0, 0x3b80, 0xfb41, 0x3900, 0xf9c1, 0xf881, 0x3840,
64 0x2800, 0xe8c1, 0xe981, 0x2940, 0xeb01, 0x2bc0, 0x2a80, 0xea41,
65 0xee01, 0x2ec0, 0x2f80, 0xef41, 0x2d00, 0xedc1, 0xec81, 0x2c40,
66 0xe401, 0x24c0, 0x2580, 0xe541, 0x2700, 0xe7c1, 0xe681, 0x2640,
67 0x2200, 0xe2c1, 0xe381, 0x2340, 0xe101, 0x21c0, 0x2080, 0xe041,
68 0xa001, 0x60c0, 0x6180, 0xa141, 0x6300, 0xa3c1, 0xa281, 0x6240,
69 0x6600, 0xa6c1, 0xa781, 0x6740, 0xa501, 0x65c0, 0x6480, 0xa441,
70 0x6c00, 0xacc1, 0xad81, 0x6d40, 0xaf01, 0x6fc0, 0x6e80, 0xae41,
71 0xaa01, 0x6ac0, 0x6b80, 0xab41, 0x6900, 0xa9c1, 0xa881, 0x6840,
72 0x7800, 0xb8c1, 0xb981, 0x7940, 0xbb01, 0x7bc0, 0x7a80, 0xba41,
73 0xbe01, 0x7ec0, 0x7f80, 0xbf41, 0x7d00, 0xbdc1, 0xbc81, 0x7c40,
74 0xb401, 0x74c0, 0x7580, 0xb541, 0x7700, 0xb7c1, 0xb681, 0x7640,
75 0x7200, 0xb2c1, 0xb381, 0x7340, 0xb101, 0x71c0, 0x7080, 0xb041,
76 0x5000, 0x90c1, 0x9181, 0x5140, 0x9301, 0x53c0, 0x5280, 0x9241,
77 0x9601, 0x56c0, 0x5780, 0x9741, 0x5500, 0x95c1, 0x9481, 0x5440,
78 0x9c01, 0x5cc0, 0x5d80, 0x9d41, 0x5f00, 0x9fc1, 0x9e81, 0x5e40,
79 0x5a00, 0x9ac1, 0x9b81, 0x5b40, 0x9901, 0x59c0, 0x5880, 0x9841,
80 0x8801, 0x48c0, 0x4980, 0x8941, 0x4b00, 0x8bc1, 0x8a81, 0x4a40,
81 0x4e00, 0x8ec1, 0x8f81, 0x4f40, 0x8d01, 0x4dc0, 0x4c80, 0x8c41,
82 0x4400, 0x84c1, 0x8581, 0x4540, 0x8701, 0x47c0, 0x4680, 0x8641,
83 0x8201, 0x42c0, 0x4380, 0x8341, 0x4100, 0x81c1, 0x8081, 0x4040,
87 /*******************************************************************************
88 ** Static local functions
90 static BOOLEAN process_reqseq (tL2C_CCB *p_ccb, UINT16 ctrl_word);
91 static void process_s_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word);
92 static void process_i_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word, BOOLEAN delay_ack);
93 static BOOLEAN retransmit_i_frames (tL2C_CCB *p_ccb, UINT8 tx_seq);
94 static void prepare_I_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, BOOLEAN is_retransmission);
95 static void process_stream_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf);
96 static BOOLEAN do_sar_reassembly (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word);
98 #if (L2CAP_ERTM_STATS == TRUE)
99 static void l2c_fcr_collect_ack_delay (tL2C_CCB *p_ccb, UINT8 num_bufs_acked);
102 /*******************************************************************************
104 ** Function l2c_fcr_updcrc
106 ** Description This function computes the CRC using the look-up table.
110 *******************************************************************************/
111 static unsigned short l2c_fcr_updcrc(unsigned short icrc, unsigned char *icp, int icnt)
113 register unsigned short crc = icrc;
114 register unsigned char *cp = icp;
115 register int cnt = icnt;
118 crc = ((crc >> 8) & 0xff) ^ crctab[(crc & 0xff) ^ *cp++];
125 /*******************************************************************************
127 ** Function l2c_fcr_tx_get_fcs
129 ** Description This function computes the CRC for a frame to be TXed.
133 *******************************************************************************/
134 static UINT16 l2c_fcr_tx_get_fcs (BT_HDR *p_buf)
136 UINT8 *p = ((UINT8 *) (p_buf + 1)) + p_buf->offset;
138 return (l2c_fcr_updcrc (L2CAP_FCR_INIT_CRC, p, p_buf->len));
141 /*******************************************************************************
143 ** Function l2c_fcr_rx_get_fcs
145 ** Description This function computes the CRC for a received frame.
149 *******************************************************************************/
150 static UINT16 l2c_fcr_rx_get_fcs (BT_HDR *p_buf)
152 UINT8 *p = ((UINT8 *) (p_buf + 1)) + p_buf->offset;
154 /* offset points past the L2CAP header, but the CRC check includes it */
155 p -= L2CAP_PKT_OVERHEAD;
157 return (l2c_fcr_updcrc (L2CAP_FCR_INIT_CRC, p, p_buf->len + L2CAP_PKT_OVERHEAD));
160 /*******************************************************************************
162 ** Function l2c_fcr_start_timer
164 ** Description This function starts the (monitor or retransmission) timer.
168 *******************************************************************************/
169 void l2c_fcr_start_timer (tL2C_CCB *p_ccb)
171 assert(p_ccb != NULL);
174 /* The timers which are in milliseconds */
175 if (p_ccb->fcrb.wait_ack) {
176 tout = (UINT32)p_ccb->our_cfg.fcr.mon_tout;
178 tout = (UINT32)p_ccb->our_cfg.fcr.rtrans_tout;
181 /* Only start a timer that was not started */
182 if (p_ccb->fcrb.mon_retrans_timer.in_use == 0) {
183 btu_start_quick_timer (&p_ccb->fcrb.mon_retrans_timer, BTU_TTYPE_L2CAP_CHNL, tout * QUICK_TIMER_TICKS_PER_SEC / 1000);
187 /*******************************************************************************
189 ** Function l2c_fcr_stop_timer
191 ** Description This function stops the (monitor or transmission) timer.
195 *******************************************************************************/
196 void l2c_fcr_stop_timer (tL2C_CCB *p_ccb)
198 assert(p_ccb != NULL);
199 if (p_ccb->fcrb.mon_retrans_timer.in_use) {
200 btu_stop_quick_timer (&p_ccb->fcrb.mon_retrans_timer);
204 /*******************************************************************************
206 ** Function l2c_fcr_cleanup
208 ** Description This function cleans up the variable used for flow-control/retrans.
212 *******************************************************************************/
213 void l2c_fcr_cleanup (tL2C_CCB *p_ccb)
215 assert(p_ccb != NULL);
216 tL2C_FCRB *p_fcrb = &p_ccb->fcrb;
218 l2c_fcr_stop_timer (p_ccb);
220 if (p_fcrb->p_rx_sdu) {
221 osi_free(p_fcrb->p_rx_sdu);
222 p_fcrb->p_rx_sdu = NULL;
226 fixed_queue_free(p_fcrb->waiting_for_ack_q, osi_free_func);
227 p_fcrb->waiting_for_ack_q = NULL;
229 fixed_queue_free(p_fcrb->srej_rcv_hold_q, osi_free_func);
230 p_fcrb->srej_rcv_hold_q = NULL;
232 fixed_queue_free(p_fcrb->retrans_q, osi_free_func);
233 p_fcrb->retrans_q = NULL;
235 btu_stop_quick_timer (&p_fcrb->ack_timer);
236 btu_stop_quick_timer (&p_ccb->fcrb.mon_retrans_timer);
238 #if (L2CAP_ERTM_STATS == TRUE)
239 if ( (p_ccb->local_cid >= L2CAP_BASE_APPL_CID) && (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) ) {
240 UINT32 dur = osi_time_get_os_boottime_ms() - p_ccb->fcrb.connect_tick_count;
241 char *p_str = (char *)osi_malloc(120);
243 UINT32 throughput_avg, ack_delay_avg, ack_q_count_avg;
245 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC,
246 "--- L2CAP ERTM Stats for CID: 0x%04x Duration: %08ums", p_ccb->local_cid, dur);
247 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC,
248 "Retransmissions:%08u Times Flow Controlled:%08u Retrans Touts:%08u Ack Touts:%08u",
249 p_ccb->fcrb.pkts_retransmitted, p_ccb->fcrb.xmit_window_closed, p_ccb->fcrb.retrans_touts, p_ccb->fcrb.xmit_ack_touts);
250 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC,
251 "Times there is less than 2 packets in controller when flow controlled:%08u", p_ccb->fcrb.controller_idle);
252 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC,
253 "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 );
255 sprintf(p_str, "Sent Pkts:%08u Bytes:%10u(%06u/sec) RR:%08u REJ:%08u RNR:%08u SREJ:%08u",
256 p_ccb->fcrb.ertm_pkt_counts[0], p_ccb->fcrb.ertm_byte_counts[0],
257 (dur >= 10 ? (p_ccb->fcrb.ertm_byte_counts[0] * 100) / (dur / 10) : 0),
258 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]);
260 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", p_str);
262 sprintf(p_str, "Rcvd Pkts:%08u Bytes:%10u(%06u/sec) RR:%08u REJ:%08u RNR:%08u SREJ:%08u",
263 p_ccb->fcrb.ertm_pkt_counts[1], p_ccb->fcrb.ertm_byte_counts[1],
264 (dur >= 10 ? (p_ccb->fcrb.ertm_byte_counts[1] * 100) / (dur / 10) : 0),
265 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]);
267 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", p_str);
273 for (i = 0; i < L2CAP_ERTM_STATS_NUM_AVG; i++ ) {
274 if (i == p_ccb->fcrb.ack_delay_avg_index ) {
275 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC,
276 "[%02u] collecting data ...", i );
280 sprintf(p_str, "[%02u] throughput: %5u, ack_delay avg:%3u, min:%3u, max:%3u, ack_q_count avg:%3u, min:%3u, max:%3u",
281 i, p_ccb->fcrb.throughput[i],
282 p_ccb->fcrb.ack_delay_avg[i], p_ccb->fcrb.ack_delay_min[i], p_ccb->fcrb.ack_delay_max[i],
283 p_ccb->fcrb.ack_q_count_avg[i], p_ccb->fcrb.ack_q_count_min[i], p_ccb->fcrb.ack_q_count_max[i] );
285 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", p_str);
287 throughput_avg += p_ccb->fcrb.throughput[i];
288 ack_delay_avg += p_ccb->fcrb.ack_delay_avg[i];
289 ack_q_count_avg += p_ccb->fcrb.ack_q_count_avg[i];
292 throughput_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1);
293 ack_delay_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1);
294 ack_q_count_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1);
296 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC,
297 "throughput_avg: %8u (kbytes/sec), ack_delay_avg: %8u ms, ack_q_count_avg: %8u",
298 throughput_avg, ack_delay_avg, ack_q_count_avg );
303 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC,
308 memset (p_fcrb, 0, sizeof (tL2C_FCRB));
311 /*******************************************************************************
313 ** Function l2c_fcr_clone_buf
315 ** Description This function allocates and copies requested part of a buffer
318 ** Returns pointer to new buffer
320 *******************************************************************************/
321 BT_HDR *l2c_fcr_clone_buf (BT_HDR *p_buf, UINT16 new_offset, UINT16 no_of_bytes)
323 assert(p_buf != NULL);
325 * NOTE: We allocate extra L2CAP_FCS_LEN octets, in case we need to put
326 * the FCS (Frame Check Sequence) at the end of the buffer.
328 uint16_t buf_size = no_of_bytes + sizeof(BT_HDR) + new_offset + L2CAP_FCS_LEN;
329 #if (L2CAP_ERTM_STATS == TRUE)
331 * NOTE: If L2CAP_ERTM_STATS is enabled, we need 4 extra octets at the
332 * end for a timestamp at the end of an I-frame.
334 buf_size += sizeof(uint32_t);
336 BT_HDR *p_buf2 = (BT_HDR *)osi_malloc(buf_size);
338 p_buf2->offset = new_offset;
339 p_buf2->len = no_of_bytes;
340 memcpy(((UINT8 *)(p_buf2 + 1)) + p_buf2->offset,
341 ((UINT8 *)(p_buf + 1)) + p_buf->offset,
347 /*******************************************************************************
349 ** Function l2c_fcr_is_flow_controlled
351 ** Description This function checks if the CCB is flow controlled by peer.
353 ** Returns The control word
355 *******************************************************************************/
356 BOOLEAN l2c_fcr_is_flow_controlled (tL2C_CCB *p_ccb)
358 assert(p_ccb != NULL);
359 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) {
360 /* Check if remote side flowed us off or the transmit window is full */
361 if ( (p_ccb->fcrb.remote_busy == TRUE)
362 || (fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q) >= p_ccb->peer_cfg.fcr.tx_win_sz) ) {
363 #if (L2CAP_ERTM_STATS == TRUE)
364 if (!fixed_queue_is_empty(p_ccb->xmit_hold_q)) {
365 p_ccb->fcrb.xmit_window_closed++;
367 if ((p_ccb->p_lcb->sent_not_acked < 2) && (l2cb.controller_xmit_window > 0)) {
368 p_ccb->fcrb.controller_idle++;
378 /*******************************************************************************
380 ** Function prepare_I_frame
382 ** Description This function sets the FCR variables in an I-frame that is
383 ** about to be sent to HCI for transmission. This may be the
384 ** first time the I-frame is sent, or a retransmission
388 *******************************************************************************/
389 static void prepare_I_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, BOOLEAN is_retransmission)
391 assert(p_ccb != NULL);
392 assert(p_buf != NULL);
393 tL2C_FCRB *p_fcrb = &p_ccb->fcrb;
397 BOOLEAN set_f_bit = p_fcrb->send_f_rsp;
399 p_fcrb->send_f_rsp = FALSE;
401 if (is_retransmission) {
402 /* Get the old control word and clear out the old req_seq and F bits */
403 p = ((UINT8 *) (p_buf + 1)) + p_buf->offset + L2CAP_PKT_OVERHEAD;
405 STREAM_TO_UINT16 (ctrl_word, p);
407 ctrl_word &= ~(L2CAP_FCR_REQ_SEQ_BITS + L2CAP_FCR_F_BIT);
409 ctrl_word = p_buf->layer_specific & L2CAP_FCR_SEG_BITS; /* SAR bits */
410 ctrl_word |= (p_fcrb->next_tx_seq << L2CAP_FCR_TX_SEQ_BITS_SHIFT); /* Tx Seq */
412 p_fcrb->next_tx_seq = (p_fcrb->next_tx_seq + 1) & L2CAP_FCR_SEQ_MODULO;
415 /* Set the F-bit and reqseq only if using re-transmission mode */
416 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) {
418 ctrl_word |= L2CAP_FCR_F_BIT;
421 ctrl_word |= (p_fcrb->next_seq_expected) << L2CAP_FCR_REQ_SEQ_BITS_SHIFT;
423 p_fcrb->last_ack_sent = p_ccb->fcrb.next_seq_expected;
425 if (p_ccb->fcrb.ack_timer.in_use) {
426 btu_stop_quick_timer (&p_ccb->fcrb.ack_timer);
430 /* Set the control word */
431 p = ((UINT8 *) (p_buf + 1)) + p_buf->offset + L2CAP_PKT_OVERHEAD;
433 UINT16_TO_STREAM (p, ctrl_word);
435 /* Compute the FCS and add to the end of the buffer if not bypassed */
436 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) {
437 /* length field in l2cap header has to include FCS length */
438 p = ((UINT8 *) (p_buf + 1)) + p_buf->offset;
439 UINT16_TO_STREAM (p, p_buf->len + L2CAP_FCS_LEN - L2CAP_PKT_OVERHEAD);
441 /* Calculate the FCS */
442 fcs = l2c_fcr_tx_get_fcs(p_buf);
444 /* Point to the end of the buffer and put the FCS there */
445 p = ((UINT8 *) (p_buf + 1)) + p_buf->offset + p_buf->len;
447 UINT16_TO_STREAM (p, fcs);
449 p_buf->len += L2CAP_FCS_LEN;
452 #if BT_TRACE_VERBOSE == TRUE
453 if (is_retransmission) {
454 L2CAP_TRACE_EVENT ("L2CAP eRTM ReTx I-frame CID: 0x%04x Len: %u SAR: %s TxSeq: %u ReqSeq: %u F: %u",
455 p_ccb->local_cid, p_buf->len,
456 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT],
457 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT,
458 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
459 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
461 L2CAP_TRACE_EVENT ("L2CAP eRTM Tx I-frame CID: 0x%04x Len: %u SAR: %-12s TxSeq: %u ReqSeq: %u F: %u",
462 p_ccb->local_cid, p_buf->len,
463 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT],
464 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT,
465 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
466 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
470 /* Start the retransmission timer if not already running */
471 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) {
472 l2c_fcr_start_timer (p_ccb);
476 /*******************************************************************************
478 ** Function l2c_fcr_send_S_frame
480 ** Description This function formats and sends an S-frame for transmission.
484 *******************************************************************************/
485 void l2c_fcr_send_S_frame (tL2C_CCB *p_ccb, UINT16 function_code, UINT16 pf_bit)
487 assert(p_ccb != NULL);
493 if ((!p_ccb->in_use) || (p_ccb->chnl_state != CST_OPEN)) {
497 #if (L2CAP_ERTM_STATS == TRUE)
498 p_ccb->fcrb.s_frames_sent[function_code]++;
501 if (pf_bit == L2CAP_FCR_P_BIT) {
502 p_ccb->fcrb.wait_ack = TRUE;
504 l2c_fcr_stop_timer (p_ccb); /* Restart the monitor timer */
505 l2c_fcr_start_timer (p_ccb);
508 /* Create the control word to use */
509 ctrl_word = (function_code << L2CAP_FCR_SUP_SHIFT) | L2CAP_FCR_S_FRAME_BIT;
510 ctrl_word |= (p_ccb->fcrb.next_seq_expected << L2CAP_FCR_REQ_SEQ_BITS_SHIFT);
513 if ((p_buf = (BT_HDR *)osi_malloc(L2CAP_CMD_BUF_SIZE)) != NULL) {
514 p_buf->offset = HCI_DATA_PREAMBLE_SIZE;
515 p_buf->len = L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD;
517 /* Set the pointer to the beginning of the data */
518 p = (UINT8 *)(p_buf + 1) + p_buf->offset;
520 /* Put in the L2CAP header */
521 UINT16_TO_STREAM (p, L2CAP_FCR_OVERHEAD + L2CAP_FCS_LEN);
522 UINT16_TO_STREAM (p, p_ccb->remote_cid);
523 UINT16_TO_STREAM (p, ctrl_word);
525 /* Compute the FCS and add to the end of the buffer if not bypassed */
526 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) {
527 fcs = l2c_fcr_tx_get_fcs (p_buf);
529 UINT16_TO_STREAM (p, fcs);
530 p_buf->len += L2CAP_FCS_LEN;
531 } else { /* rewrite the length without FCS length */
533 UINT16_TO_STREAM (p, L2CAP_FCR_OVERHEAD);
536 /* Now, the HCI transport header */
537 p_buf->layer_specific = L2CAP_NON_FLUSHABLE_PKT;
538 l2cu_set_acl_hci_header (p_buf, p_ccb);
540 #if BT_TRACE_VERBOSE == TRUE
541 if ((((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 1)
542 || (((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 3)) {
543 L2CAP_TRACE_WARNING ("L2CAP eRTM Tx S-frame CID: 0x%04x ctrlword: 0x%04x Type: %s ReqSeq: %u P: %u F: %u",
544 p_ccb->local_cid, ctrl_word,
545 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT],
546 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
547 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT,
548 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
549 L2CAP_TRACE_WARNING (" Buf Len: %u", p_buf->len);
551 L2CAP_TRACE_EVENT ("L2CAP eRTM Tx S-frame CID: 0x%04x ctrlword: 0x%04x Type: %s ReqSeq: %u P: %u F: %u",
552 p_ccb->local_cid, ctrl_word,
553 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT],
554 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
555 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT,
556 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
557 L2CAP_TRACE_EVENT (" Buf Len: %u", p_buf->len);
559 #endif /* BT_TRACE_VERBOSE */
561 l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, p_buf);
563 p_ccb->fcrb.last_ack_sent = p_ccb->fcrb.next_seq_expected;
565 if (p_ccb->fcrb.ack_timer.in_use) {
566 btu_stop_quick_timer (&p_ccb->fcrb.ack_timer);
569 L2CAP_TRACE_ERROR ("l2c_fcr_send_S_frame(No Resources) cid 0x%04x, Type: 0x%4x",
570 p_ccb->local_cid, function_code);
575 /*******************************************************************************
577 ** Function l2c_fcr_proc_pdu
579 ** Description This function is the entry point for processing of a
580 ** received PDU when in flow control and/or retransmission modes.
584 *******************************************************************************/
585 void l2c_fcr_proc_pdu (tL2C_CCB *p_ccb, BT_HDR *p_buf)
587 assert(p_ccb != NULL);
588 assert(p_buf != NULL);
594 /* Check the length */
595 min_pdu_len = (p_ccb->bypass_fcs == L2CAP_BYPASS_FCS) ?
596 (UINT16)L2CAP_FCR_OVERHEAD : (UINT16)(L2CAP_FCS_LEN + L2CAP_FCR_OVERHEAD);
598 if (p_buf->len < min_pdu_len) {
599 L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x Len too short: %u", p_ccb->local_cid, p_buf->len);
604 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_STREAM_MODE) {
605 process_stream_frame (p_ccb, p_buf);
609 #if BT_TRACE_VERBOSE == TRUE
610 /* Get the control word */
611 p = ((UINT8 *)(p_buf + 1)) + p_buf->offset;
612 STREAM_TO_UINT16 (ctrl_word, p);
614 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) {
615 if ((((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 1)
616 || (((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 3)) {
618 L2CAP_TRACE_WARNING ("L2CAP eRTM Rx S-frame: cid: 0x%04x Len: %u Type: %s ReqSeq: %u P: %u F: %u",
619 p_ccb->local_cid, p_buf->len,
620 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT],
621 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
622 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT,
623 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
625 L2CAP_TRACE_EVENT ("L2CAP eRTM Rx S-frame: cid: 0x%04x Len: %u Type: %s ReqSeq: %u P: %u F: %u",
626 p_ccb->local_cid, p_buf->len,
627 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT],
628 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
629 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT,
630 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
633 L2CAP_TRACE_EVENT ("L2CAP eRTM Rx I-frame: cid: 0x%04x Len: %u SAR: %-12s TxSeq: %u ReqSeq: %u F: %u",
634 p_ccb->local_cid, p_buf->len,
635 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT],
636 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT,
637 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
638 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
641 L2CAP_TRACE_EVENT (" eRTM Rx Nxt_tx_seq %u, Lst_rx_ack %u, Nxt_seq_exp %u, Lst_ack_snt %u, wt_q.cnt %u, tries %u",
642 p_ccb->fcrb.next_tx_seq, p_ccb->fcrb.last_rx_ack,
643 p_ccb->fcrb.next_seq_expected,
644 p_ccb->fcrb.last_ack_sent,
645 fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q),
646 p_ccb->fcrb.num_tries);
648 #endif /* BT_TRACE_VERBOSE */
650 /* Verify FCS if using */
651 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) {
652 p = ((UINT8 *)(p_buf + 1)) + p_buf->offset + p_buf->len - L2CAP_FCS_LEN;
654 /* Extract and drop the FCS from the packet */
655 STREAM_TO_UINT16 (fcs, p);
656 p_buf->len -= L2CAP_FCS_LEN;
658 if (l2c_fcr_rx_get_fcs(p_buf) != fcs) {
659 L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x BAD FCS", p_ccb->local_cid);
665 /* Get the control word */
666 p = ((UINT8 *)(p_buf + 1)) + p_buf->offset;
668 STREAM_TO_UINT16 (ctrl_word, p);
670 p_buf->len -= L2CAP_FCR_OVERHEAD;
671 p_buf->offset += L2CAP_FCR_OVERHEAD;
673 /* If we had a poll bit outstanding, check if we got a final response */
674 if (p_ccb->fcrb.wait_ack) {
675 /* If final bit not set, ignore the frame unless it is a polled S-frame */
676 if ( !(ctrl_word & L2CAP_FCR_F_BIT) ) {
677 if ( (ctrl_word & L2CAP_FCR_P_BIT) && (ctrl_word & L2CAP_FCR_S_FRAME_BIT) ) {
678 if (p_ccb->fcrb.srej_sent) {
679 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_SREJ, L2CAP_FCR_F_BIT);
680 } else if (p_ccb->fcrb.local_busy) {
681 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_F_BIT);
683 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_F_BIT);
686 /* Got a poll while in wait_ack state, so re-start our timer with 1-second */
687 /* This is a small optimization... the monitor timer is 12 secs, but we saw */
688 /* that if the other side sends us a poll when we are waiting for a final, */
689 /* then it speeds up recovery significantly if we poll him back soon after his poll. */
690 btu_start_quick_timer (&p_ccb->fcrb.mon_retrans_timer, BTU_TTYPE_L2CAP_CHNL, QUICK_TIMER_TICKS_PER_SEC);
696 p_ccb->fcrb.wait_ack = FALSE;
698 /* P and F are mutually exclusive */
699 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) {
700 ctrl_word &= ~L2CAP_FCR_P_BIT;
703 if (fixed_queue_is_empty(p_ccb->fcrb.waiting_for_ack_q)) {
704 p_ccb->fcrb.num_tries = 0;
707 l2c_fcr_stop_timer (p_ccb);
709 /* Otherwise, ensure the final bit is ignored */
710 ctrl_word &= ~L2CAP_FCR_F_BIT;
713 /* Process receive sequence number */
714 if (!process_reqseq (p_ccb, ctrl_word)) {
719 /* Process based on whether it is an S-frame or an I-frame */
720 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) {
721 process_s_frame (p_ccb, p_buf, ctrl_word);
723 process_i_frame (p_ccb, p_buf, ctrl_word, FALSE);
726 /* Return if the channel got disconnected by a bad packet or max retransmissions */
727 if ( (!p_ccb->in_use) || (p_ccb->chnl_state != CST_OPEN) ) {
731 /* If we have some buffers held while doing SREJ, and SREJ has cleared, process them now */
732 if ( (!p_ccb->fcrb.local_busy) && (!p_ccb->fcrb.srej_sent) &&
733 (!fixed_queue_is_empty(p_ccb->fcrb.srej_rcv_hold_q))) {
734 fixed_queue_t *temp_q = p_ccb->fcrb.srej_rcv_hold_q;
735 p_ccb->fcrb.srej_rcv_hold_q = fixed_queue_new(SIZE_MAX);
737 while ((p_buf = (BT_HDR *)fixed_queue_try_dequeue(temp_q)) != NULL) {
738 if (p_ccb->in_use && (p_ccb->chnl_state == CST_OPEN)) {
739 /* Get the control word */
740 p = ((UINT8 *)(p_buf + 1)) + p_buf->offset - L2CAP_FCR_OVERHEAD;
742 STREAM_TO_UINT16 (ctrl_word, p);
744 L2CAP_TRACE_DEBUG ("l2c_fcr_proc_pdu() CID: 0x%04x Process Buffer from SREJ_Hold_Q TxSeq: %u Expected_Seq: %u",
745 p_ccb->local_cid, (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT,
746 p_ccb->fcrb.next_seq_expected);
748 /* Process the SREJ held I-frame, but do not send an RR for each individual frame */
749 process_i_frame (p_ccb, p_buf, ctrl_word, TRUE);
754 /* If more frames were lost during SREJ, send a REJ */
755 if (p_ccb->fcrb.rej_after_srej) {
756 p_ccb->fcrb.rej_after_srej = FALSE;
757 p_ccb->fcrb.rej_sent = TRUE;
759 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_REJ, 0);
762 fixed_queue_free(temp_q, NULL);
764 /* Now, if needed, send one RR for the whole held queue */
765 if ( (!p_ccb->fcrb.local_busy) && (!p_ccb->fcrb.rej_sent) && (!p_ccb->fcrb.srej_sent)
766 && (p_ccb->fcrb.next_seq_expected != p_ccb->fcrb.last_ack_sent) ) {
767 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, 0);
769 L2CAP_TRACE_DEBUG ("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",
770 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,
771 p_ccb->fcrb.last_ack_sent);
775 /* If a window has opened, check if we can send any more packets */
776 if ( (!fixed_queue_is_empty(p_ccb->fcrb.retrans_q) ||
777 !fixed_queue_is_empty(p_ccb->xmit_hold_q))
778 && (p_ccb->fcrb.wait_ack == FALSE)
779 && (l2c_fcr_is_flow_controlled (p_ccb) == FALSE) ) {
780 l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, NULL);
784 /*******************************************************************************
786 ** Function l2c_fcr_proc_tout
788 ** Description Handle a timeout. We should be in error recovery state.
792 *******************************************************************************/
793 void l2c_fcr_proc_tout (tL2C_CCB *p_ccb)
795 assert(p_ccb != NULL);
796 L2CAP_TRACE_DEBUG ("l2c_fcr_proc_tout: CID: 0x%04x num_tries: %u (max: %u) wait_ack: %u ack_q_count: %u",
797 p_ccb->local_cid, p_ccb->fcrb.num_tries,
798 p_ccb->peer_cfg.fcr.max_transmit,
799 p_ccb->fcrb.wait_ack,
800 fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q));
802 #if (L2CAP_ERTM_STATS == TRUE)
803 p_ccb->fcrb.retrans_touts++;
806 if ( (p_ccb->peer_cfg.fcr.max_transmit != 0) && (++p_ccb->fcrb.num_tries > p_ccb->peer_cfg.fcr.max_transmit) ) {
807 l2cu_disconnect_chnl (p_ccb);
809 if (!p_ccb->fcrb.srej_sent && !p_ccb->fcrb.rej_sent) {
810 if (p_ccb->fcrb.local_busy) {
811 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_P_BIT);
813 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_P_BIT);
820 /*******************************************************************************
822 ** Function l2c_fcr_proc_ack_tout
824 ** Description Send RR/RNR if we have not acked I frame
828 *******************************************************************************/
829 void l2c_fcr_proc_ack_tout (tL2C_CCB *p_ccb)
831 assert(p_ccb != NULL);
832 L2CAP_TRACE_DEBUG ("l2c_fcr_proc_ack_tout: CID: 0x%04x State: %u Wack:%u Rq:%d Acked:%d", p_ccb->local_cid,
833 p_ccb->chnl_state, p_ccb->fcrb.wait_ack, p_ccb->fcrb.next_seq_expected, p_ccb->fcrb.last_ack_sent);
835 if ( (p_ccb->chnl_state == CST_OPEN) && (!p_ccb->fcrb.wait_ack)
836 && (p_ccb->fcrb.last_ack_sent != p_ccb->fcrb.next_seq_expected) ) {
837 #if (L2CAP_ERTM_STATS == TRUE)
838 p_ccb->fcrb.xmit_ack_touts++;
840 if (p_ccb->fcrb.local_busy) {
841 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, 0);
843 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, 0);
849 /*******************************************************************************
851 ** Function process_reqseq
853 ** Description Handle receive sequence number
857 *******************************************************************************/
858 static BOOLEAN process_reqseq (tL2C_CCB *p_ccb, UINT16 ctrl_word)
860 assert(p_ccb != NULL);
861 tL2C_FCRB *p_fcrb = &p_ccb->fcrb;
862 UINT8 req_seq, num_bufs_acked, xx;
864 UINT16 full_sdus_xmitted;
866 /* Receive sequence number does not ack anything for SREJ with P-bit set to zero */
867 if ( (ctrl_word & L2CAP_FCR_S_FRAME_BIT)
868 && ((ctrl_word & L2CAP_FCR_SUP_BITS) == (L2CAP_FCR_SUP_SREJ << L2CAP_FCR_SUP_SHIFT))
869 && ((ctrl_word & L2CAP_FCR_P_BIT) == 0) ) {
870 /* If anything still waiting for ack, restart the timer if it was stopped */
871 if (!fixed_queue_is_empty(p_fcrb->waiting_for_ack_q)) {
872 l2c_fcr_start_timer(p_ccb);
878 /* Extract the receive sequence number from the control word */
879 req_seq = (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT;
881 num_bufs_acked = (req_seq - p_fcrb->last_rx_ack) & L2CAP_FCR_SEQ_MODULO;
883 /* Verify the request sequence is in range before proceeding */
884 if (num_bufs_acked > fixed_queue_length(p_fcrb->waiting_for_ack_q)) {
885 /* The channel is closed if ReqSeq is not in range */
886 L2CAP_TRACE_WARNING ("L2CAP eRTM Frame BAD Req_Seq - ctrl_word: 0x%04x req_seq 0x%02x last_rx_ack: 0x%02x QCount: %u",
887 ctrl_word, req_seq, p_fcrb->last_rx_ack,
888 fixed_queue_length(p_fcrb->waiting_for_ack_q));
890 l2cu_disconnect_chnl (p_ccb);
894 p_fcrb->last_rx_ack = req_seq;
896 /* Now we can release all acknowledged frames, and restart the retransmission timer if needed */
897 if (num_bufs_acked != 0) {
898 p_fcrb->num_tries = 0;
899 full_sdus_xmitted = 0;
901 #if (L2CAP_ERTM_STATS == TRUE)
902 l2c_fcr_collect_ack_delay (p_ccb, num_bufs_acked);
905 for (xx = 0; xx < num_bufs_acked; xx++) {
906 BT_HDR *p_tmp = (BT_HDR *)fixed_queue_try_dequeue(p_fcrb->waiting_for_ack_q);
907 ls = p_tmp->layer_specific & L2CAP_FCR_SAR_BITS;
909 if ( (ls == L2CAP_FCR_UNSEG_SDU) || (ls == L2CAP_FCR_END_SDU) ) {
915 /* If we are still in a wait_ack state, do not mess with the timer */
916 if (!p_ccb->fcrb.wait_ack) {
917 l2c_fcr_stop_timer (p_ccb);
920 /* Check if we need to call the "packet_sent" callback */
921 if ( (p_ccb->p_rcb) && (p_ccb->p_rcb->api.pL2CA_TxComplete_Cb) && (full_sdus_xmitted) ) {
922 /* Special case for eRTM, if all packets sent, send 0xFFFF */
923 if (fixed_queue_is_empty(p_fcrb->waiting_for_ack_q) &&
924 fixed_queue_is_empty(p_ccb->xmit_hold_q)) {
925 full_sdus_xmitted = 0xFFFF;
928 (*p_ccb->p_rcb->api.pL2CA_TxComplete_Cb)(p_ccb->local_cid, full_sdus_xmitted);
932 /* If anything still waiting for ack, restart the timer if it was stopped */
933 if (!fixed_queue_is_empty(p_fcrb->waiting_for_ack_q)) {
934 l2c_fcr_start_timer (p_ccb);
941 /*******************************************************************************
943 ** Function process_s_frame
945 ** Description Process an S frame
949 *******************************************************************************/
950 static void process_s_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word)
952 assert(p_ccb != NULL);
953 assert(p_buf != NULL);
955 tL2C_FCRB *p_fcrb = &p_ccb->fcrb;
956 UINT16 s_frame_type = (ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT;
957 BOOLEAN remote_was_busy;
958 BOOLEAN all_ok = TRUE;
960 if (p_buf->len != 0) {
961 L2CAP_TRACE_WARNING ("Incorrect S-frame Length (%d)", p_buf->len);
964 L2CAP_TRACE_DEBUG ("process_s_frame ctrl_word 0x%04x fcrb_remote_busy:%d", ctrl_word, p_fcrb->remote_busy);
966 #if (L2CAP_ERTM_STATS == TRUE)
967 p_ccb->fcrb.s_frames_rcvd[s_frame_type]++;
970 if (ctrl_word & L2CAP_FCR_P_BIT) {
971 p_fcrb->rej_sent = FALSE; /* After checkpoint, we can send anoher REJ */
972 p_fcrb->send_f_rsp = TRUE; /* Set a flag in case an I-frame is pending */
975 switch (s_frame_type) {
976 case L2CAP_FCR_SUP_RR:
977 remote_was_busy = p_fcrb->remote_busy;
978 p_fcrb->remote_busy = FALSE;
980 if ( (ctrl_word & L2CAP_FCR_F_BIT) || (remote_was_busy) ) {
981 all_ok = retransmit_i_frames (p_ccb, L2C_FCR_RETX_ALL_PKTS);
985 case L2CAP_FCR_SUP_REJ:
986 p_fcrb->remote_busy = FALSE;
987 all_ok = retransmit_i_frames (p_ccb, L2C_FCR_RETX_ALL_PKTS);
990 case L2CAP_FCR_SUP_RNR:
991 p_fcrb->remote_busy = TRUE;
992 l2c_fcr_stop_timer (p_ccb);
995 case L2CAP_FCR_SUP_SREJ:
996 p_fcrb->remote_busy = FALSE;
997 all_ok = retransmit_i_frames (p_ccb, (UINT8)((ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT));
1002 /* If polled, we need to respond with F-bit. Note, we may have sent a I-frame with the F-bit */
1003 if (p_fcrb->send_f_rsp) {
1004 if (p_fcrb->srej_sent) {
1005 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_SREJ, L2CAP_FCR_F_BIT);
1006 } else if (p_fcrb->local_busy) {
1007 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_F_BIT);
1009 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_F_BIT);
1012 p_fcrb->send_f_rsp = FALSE;
1015 L2CAP_TRACE_DEBUG ("process_s_frame hit_max_retries");
1022 /*******************************************************************************
1024 ** Function process_i_frame
1026 ** Description Process an I frame
1030 *******************************************************************************/
1031 static void process_i_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word, BOOLEAN delay_ack)
1033 assert(p_ccb != NULL);
1034 assert(p_buf != NULL);
1036 tL2C_FCRB *p_fcrb = &p_ccb->fcrb;
1037 UINT8 tx_seq, num_lost, num_to_ack, next_srej;
1039 /* If we were doing checkpoint recovery, first retransmit all unacked I-frames */
1040 if (ctrl_word & L2CAP_FCR_F_BIT) {
1041 if (!retransmit_i_frames (p_ccb, L2C_FCR_RETX_ALL_PKTS)) {
1047 #if (L2CAP_ERTM_STATS == TRUE)
1048 p_ccb->fcrb.ertm_pkt_counts[1]++;
1049 p_ccb->fcrb.ertm_byte_counts[1] += p_buf->len;
1052 /* Extract the sequence number */
1053 tx_seq = (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT;
1055 /* If we have flow controlled the peer, ignore any bad I-frames from him */
1056 if ( (tx_seq != p_fcrb->next_seq_expected) && (p_fcrb->local_busy) ) {
1057 L2CAP_TRACE_WARNING ("Dropping bad I-Frame since we flowed off, tx_seq:%u", tx_seq);
1058 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, 0);
1063 /* Check if tx-sequence is the expected one */
1064 if (tx_seq != p_fcrb->next_seq_expected) {
1065 num_lost = (tx_seq - p_fcrb->next_seq_expected) & L2CAP_FCR_SEQ_MODULO;
1067 /* Is the frame a duplicate ? If so, just drop it */
1068 if (num_lost >= p_ccb->our_cfg.fcr.tx_win_sz) {
1069 /* Duplicate - simply drop it */
1070 L2CAP_TRACE_WARNING ("process_i_frame() Dropping Duplicate Frame tx_seq:%u ExpectedTxSeq %u", tx_seq, p_fcrb->next_seq_expected);
1073 L2CAP_TRACE_WARNING ("process_i_frame() CID: 0x%04x Lost: %u tx_seq:%u ExpTxSeq %u Rej: %u SRej: %u",
1074 p_ccb->local_cid, num_lost, tx_seq, p_fcrb->next_seq_expected, p_fcrb->rej_sent, p_fcrb->srej_sent);
1076 if (p_fcrb->srej_sent) {
1077 /* If SREJ sent, save the frame for later processing as long as it is in sequence */
1078 next_srej = (((BT_HDR *)fixed_queue_try_peek_last(p_fcrb->srej_rcv_hold_q))->layer_specific + 1) & L2CAP_FCR_SEQ_MODULO;
1080 if ( (tx_seq == next_srej) && (fixed_queue_length(p_fcrb->srej_rcv_hold_q) < p_ccb->our_cfg.fcr.tx_win_sz) ) {
1081 /* If user gave us a pool for held rx buffers, use that */
1082 /* TODO: Could that happen? Get rid of this code. */
1083 if (p_ccb->ertm_info.fcr_rx_buf_size != L2CAP_FCR_RX_BUF_SIZE) {
1086 /* Adjust offset and len so that control word is copied */
1087 p_buf->offset -= L2CAP_FCR_OVERHEAD;
1088 p_buf->len += L2CAP_FCR_OVERHEAD;
1090 p_buf2 = l2c_fcr_clone_buf (p_buf, p_buf->offset, p_buf->len);
1096 p_buf->offset += L2CAP_FCR_OVERHEAD;
1097 p_buf->len -= L2CAP_FCR_OVERHEAD;
1099 L2CAP_TRACE_DEBUG ("process_i_frame() Lost: %u tx_seq:%u ExpTxSeq %u Rej: %u SRej1",
1100 num_lost, tx_seq, p_fcrb->next_seq_expected, p_fcrb->rej_sent);
1102 p_buf->layer_specific = tx_seq;
1103 fixed_queue_enqueue(p_fcrb->srej_rcv_hold_q, p_buf);
1105 L2CAP_TRACE_WARNING ("process_i_frame() CID: 0x%04x frame dropped in Srej Sent next_srej:%u hold_q.count:%u win_sz:%u",
1106 p_ccb->local_cid, next_srej, fixed_queue_length(p_fcrb->srej_rcv_hold_q), p_ccb->our_cfg.fcr.tx_win_sz);
1108 p_fcrb->rej_after_srej = TRUE;
1111 } else if (p_fcrb->rej_sent) {
1112 L2CAP_TRACE_WARNING ("process_i_frame() CID: 0x%04x Lost: %u tx_seq:%u ExpTxSeq %u Rej: 1 SRej: %u",
1113 p_ccb->local_cid, num_lost, tx_seq, p_fcrb->next_seq_expected, p_fcrb->srej_sent);
1115 /* If REJ sent, just drop the frame */
1118 L2CAP_TRACE_DEBUG ("process_i_frame() CID: 0x%04x tx_seq:%u ExpTxSeq %u Rej: %u",
1119 p_ccb->local_cid, tx_seq, p_fcrb->next_seq_expected, p_fcrb->rej_sent);
1121 /* If only one lost, we will send SREJ, otherwise we will send REJ */
1124 p_fcrb->rej_sent = TRUE;
1125 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_REJ, 0);
1127 if (!fixed_queue_is_empty(p_fcrb->srej_rcv_hold_q)) {
1128 L2CAP_TRACE_ERROR ("process_i_frame() CID: 0x%04x sending SREJ tx_seq:%d hold_q.count:%u",
1129 p_ccb->local_cid, tx_seq, fixed_queue_length(p_fcrb->srej_rcv_hold_q));
1131 p_buf->layer_specific = tx_seq;
1132 fixed_queue_enqueue(p_fcrb->srej_rcv_hold_q, p_buf);
1133 p_fcrb->srej_sent = TRUE;
1134 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_SREJ, 0);
1136 btu_stop_quick_timer (&p_ccb->fcrb.ack_timer);
1142 /* Seq number is the next expected. Clear possible reject exception in case it occured */
1143 p_fcrb->rej_sent = p_fcrb->srej_sent = FALSE;
1145 /* Adjust the next_seq, so that if the upper layer sends more data in the callback
1146 context, the received frame is acked by an I-frame. */
1147 p_fcrb->next_seq_expected = (tx_seq + 1) & L2CAP_FCR_SEQ_MODULO;
1149 /* If any SAR problem in eRTM mode, spec says disconnect. */
1150 if (!do_sar_reassembly (p_ccb, p_buf, ctrl_word)) {
1151 L2CAP_TRACE_WARNING ("process_i_frame() CID: 0x%04x reassembly failed", p_ccb->local_cid);
1152 l2cu_disconnect_chnl (p_ccb);
1156 /* RR optimization - if peer can still send us more, then start an ACK timer */
1157 num_to_ack = (p_fcrb->next_seq_expected - p_fcrb->last_ack_sent) & L2CAP_FCR_SEQ_MODULO;
1159 if ( (num_to_ack < p_ccb->fcrb.max_held_acks) && (!p_fcrb->local_busy) ) {
1163 /* We should neve never ack frame if we are not in OPEN state */
1164 if ((num_to_ack != 0) && p_ccb->in_use && (p_ccb->chnl_state == CST_OPEN)) {
1165 /* If no frames are awaiting transmission or are held, send an RR or RNR S-frame for ack */
1167 /* If it is the first I frame we did not ack, start ack timer */
1168 if (!p_ccb->fcrb.ack_timer.in_use) {
1169 btu_start_quick_timer (&p_ccb->fcrb.ack_timer, BTU_TTYPE_L2CAP_FCR_ACK,
1170 (L2CAP_FCR_ACK_TOUT * QUICK_TIMER_TICKS_PER_SEC) / 1000);
1172 } else if ((fixed_queue_is_empty(p_ccb->xmit_hold_q) ||
1173 l2c_fcr_is_flow_controlled(p_ccb))
1174 && fixed_queue_is_empty(p_ccb->fcrb.srej_rcv_hold_q)) {
1175 if (p_fcrb->local_busy) {
1176 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, 0);
1178 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, 0);
1185 /*******************************************************************************
1187 ** Function process_stream_frame
1189 ** Description This function processes frames in streaming mode
1193 *******************************************************************************/
1194 static void process_stream_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf)
1196 assert(p_ccb != NULL);
1197 assert(p_buf != NULL);
1204 /* Verify FCS if using */
1205 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) {
1206 p = ((UINT8 *)(p_buf + 1)) + p_buf->offset + p_buf->len - L2CAP_FCS_LEN;
1208 /* Extract and drop the FCS from the packet */
1209 STREAM_TO_UINT16 (fcs, p);
1210 p_buf->len -= L2CAP_FCS_LEN;
1212 if (l2c_fcr_rx_get_fcs(p_buf) != fcs) {
1213 L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x BAD FCS", p_ccb->local_cid);
1219 /* Get the control word */
1220 p = ((UINT8 *)(p_buf + 1)) + p_buf->offset;
1222 STREAM_TO_UINT16 (ctrl_word, p);
1224 p_buf->len -= L2CAP_FCR_OVERHEAD;
1225 p_buf->offset += L2CAP_FCR_OVERHEAD;
1227 /* Make sure it is an I-frame */
1228 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) {
1229 L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x BAD S-frame in streaming mode ctrl_word: 0x%04x", p_ccb->local_cid, ctrl_word);
1234 #if BT_TRACE_VERBOSE == TRUE
1235 L2CAP_TRACE_EVENT ("L2CAP eRTM Rx I-frame: cid: 0x%04x Len: %u SAR: %-12s TxSeq: %u ReqSeq: %u F: %u",
1236 p_ccb->local_cid, p_buf->len,
1237 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT],
1238 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT,
1239 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT,
1240 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT);
1243 /* Extract the sequence number */
1244 tx_seq = (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT;
1246 /* Check if tx-sequence is the expected one */
1247 if (tx_seq != p_ccb->fcrb.next_seq_expected) {
1248 L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x Lost frames Exp: %u Got: %u p_rx_sdu: %p",
1249 p_ccb->local_cid, p_ccb->fcrb.next_seq_expected, tx_seq, p_ccb->fcrb.p_rx_sdu);
1251 /* Lost one or more packets, so flush the SAR queue */
1252 if (p_ccb->fcrb.p_rx_sdu != NULL) {
1253 osi_free(p_ccb->fcrb.p_rx_sdu);
1254 p_ccb->fcrb.p_rx_sdu = NULL;
1258 p_ccb->fcrb.next_seq_expected = (tx_seq + 1) & L2CAP_FCR_SEQ_MODULO;
1260 if (!do_sar_reassembly (p_ccb, p_buf, ctrl_word)) {
1261 /* Some sort of SAR error, so flush the SAR queue */
1262 if (p_ccb->fcrb.p_rx_sdu != NULL) {
1263 osi_free(p_ccb->fcrb.p_rx_sdu);
1264 p_ccb->fcrb.p_rx_sdu = NULL;
1270 /*******************************************************************************
1272 ** Function do_sar_reassembly
1274 ** Description Process SAR bits and re-assemble frame
1276 ** Returns TRUE if all OK, else FALSE
1278 *******************************************************************************/
1279 static BOOLEAN do_sar_reassembly (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word)
1281 assert(p_ccb != NULL);
1282 assert(p_buf != NULL);
1284 tL2C_FCRB *p_fcrb = &p_ccb->fcrb;
1285 UINT16 sar_type = ctrl_word & L2CAP_FCR_SEG_BITS;
1286 BOOLEAN packet_ok = TRUE;
1289 /* Check if the SAR state is correct */
1290 if ((sar_type == L2CAP_FCR_UNSEG_SDU) || (sar_type == L2CAP_FCR_START_SDU)) {
1291 if (p_fcrb->p_rx_sdu != NULL) {
1292 L2CAP_TRACE_WARNING ("SAR - got unexpected unsegmented or start SDU Expected len: %u Got so far: %u",
1293 p_fcrb->rx_sdu_len, p_fcrb->p_rx_sdu->len);
1297 /* Check the length of the packet */
1298 if ( (sar_type == L2CAP_FCR_START_SDU) && (p_buf->len < L2CAP_SDU_LEN_OVERHEAD) ) {
1299 L2CAP_TRACE_WARNING ("SAR start packet too short: %u", p_buf->len);
1303 if (p_fcrb->p_rx_sdu == NULL) {
1304 L2CAP_TRACE_WARNING ("SAR - got unexpected cont or end SDU");
1309 if ( (packet_ok) && (sar_type != L2CAP_FCR_UNSEG_SDU) ) {
1310 p = ((UINT8 *)(p_buf + 1)) + p_buf->offset;
1312 /* For start SDU packet, extract the SDU length */
1313 if (sar_type == L2CAP_FCR_START_SDU) {
1314 /* Get the SDU length */
1315 STREAM_TO_UINT16 (p_fcrb->rx_sdu_len, p);
1319 if (p_fcrb->rx_sdu_len > p_ccb->max_rx_mtu) {
1320 L2CAP_TRACE_WARNING ("SAR - SDU len: %u larger than MTU: %u", p_fcrb->rx_sdu_len, p_fcrb->rx_sdu_len);
1322 } else if ((p_fcrb->p_rx_sdu = (BT_HDR *)osi_malloc(L2CAP_MAX_BUF_SIZE)) == NULL) {
1323 L2CAP_TRACE_ERROR ("SAR - no buffer for SDU start user_rx_buf_size:%d", p_ccb->ertm_info.user_rx_buf_size);
1326 p_fcrb->p_rx_sdu->offset = 4; /* this is the minimal offset required by OBX to process incoming packets */
1327 p_fcrb->p_rx_sdu->len = 0;
1332 if ((p_fcrb->p_rx_sdu->len + p_buf->len) > p_fcrb->rx_sdu_len) {
1333 L2CAP_TRACE_ERROR ("SAR - SDU len exceeded Type: %u Lengths: %u %u %u",
1334 sar_type, p_fcrb->p_rx_sdu->len, p_buf->len, p_fcrb->rx_sdu_len);
1336 } else if ( (sar_type == L2CAP_FCR_END_SDU) && ((p_fcrb->p_rx_sdu->len + p_buf->len) != p_fcrb->rx_sdu_len) ) {
1337 L2CAP_TRACE_WARNING ("SAR - SDU end rcvd but SDU incomplete: %u %u %u",
1338 p_fcrb->p_rx_sdu->len, p_buf->len, p_fcrb->rx_sdu_len);
1341 memcpy (((UINT8 *) (p_fcrb->p_rx_sdu + 1)) + p_fcrb->p_rx_sdu->offset + p_fcrb->p_rx_sdu->len, p, p_buf->len);
1343 p_fcrb->p_rx_sdu->len += p_buf->len;
1348 if (sar_type == L2CAP_FCR_END_SDU) {
1349 p_buf = p_fcrb->p_rx_sdu;
1350 p_fcrb->p_rx_sdu = NULL;
1356 if (packet_ok == FALSE) {
1358 } else if (p_buf != NULL) {
1359 #if (L2CAP_NUM_FIXED_CHNLS > 0)
1360 if (p_ccb->local_cid < L2CAP_BASE_APPL_CID &&
1361 (p_ccb->local_cid >= L2CAP_FIRST_FIXED_CHNL && p_ccb->local_cid <= L2CAP_LAST_FIXED_CHNL)) {
1362 if (l2cb.fixed_reg[p_ccb->local_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb)
1363 (*l2cb.fixed_reg[p_ccb->local_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb)
1364 (p_ccb->local_cid, p_ccb->p_lcb->remote_bd_addr, p_buf);
1367 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DATA, p_buf);
1374 /*******************************************************************************
1376 ** Function retransmit_i_frames
1378 ** Description This function retransmits i-frames awaiting acks.
1380 ** Returns BOOLEAN - TRUE if retransmitted
1382 *******************************************************************************/
1383 static BOOLEAN retransmit_i_frames (tL2C_CCB *p_ccb, UINT8 tx_seq)
1385 assert(p_ccb != NULL);
1387 BT_HDR *p_buf = NULL;
1392 if ( (!fixed_queue_is_empty(p_ccb->fcrb.waiting_for_ack_q))
1393 && (p_ccb->peer_cfg.fcr.max_transmit != 0)
1394 && (p_ccb->fcrb.num_tries >= p_ccb->peer_cfg.fcr.max_transmit) ) {
1395 L2CAP_TRACE_EVENT ("Max Tries Exceeded: (last_acq: %d CID: 0x%04x num_tries: %u (max: %u) ack_q_count: %u",
1396 p_ccb->fcrb.last_rx_ack, p_ccb->local_cid, p_ccb->fcrb.num_tries, p_ccb->peer_cfg.fcr.max_transmit,
1397 fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q));
1399 l2cu_disconnect_chnl (p_ccb);
1403 /* tx_seq indicates whether to retransmit a specific sequence or all (if == L2C_FCR_RETX_ALL_PKTS) */
1404 list_t *list_ack = NULL;
1405 const list_node_t *node_ack = NULL;
1406 if (! fixed_queue_is_empty(p_ccb->fcrb.waiting_for_ack_q)) {
1407 list_ack = fixed_queue_get_list(p_ccb->fcrb.waiting_for_ack_q);
1408 node_ack = list_begin(list_ack);
1410 if (tx_seq != L2C_FCR_RETX_ALL_PKTS) {
1411 /* If sending only one, the sequence number tells us which one. Look for it.
1413 if (list_ack != NULL) {
1414 for ( ; node_ack != list_end(list_ack); node_ack = list_next(node_ack)) {
1415 p_buf = (BT_HDR *)list_node(node_ack);
1416 /* Get the old control word */
1417 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + L2CAP_PKT_OVERHEAD;
1419 STREAM_TO_UINT16 (ctrl_word, p);
1421 buf_seq = (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT;
1423 L2CAP_TRACE_DEBUG ("retransmit_i_frames() cur seq: %u looking for: %u", buf_seq, tx_seq);
1425 if (tx_seq == buf_seq) {
1432 L2CAP_TRACE_ERROR ("retransmit_i_frames() UNKNOWN seq: %u q_count: %u",
1434 fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q));
1438 // Iterate though list and flush the amount requested from
1439 // the transmit data queue that satisfy the layer and event conditions.
1440 for (const list_node_t *node = list_begin(p_ccb->p_lcb->link_xmit_data_q);
1441 node != list_end(p_ccb->p_lcb->link_xmit_data_q);) {
1442 BT_HDR *p_buf = (BT_HDR *)list_node(node);
1443 node = list_next(node);
1445 /* Do not flush other CIDs or partial segments */
1446 if ((p_buf->layer_specific == 0) && (p_buf->event == p_ccb->local_cid)) {
1447 list_remove(p_ccb->p_lcb->link_xmit_data_q, p_buf);
1452 /* Also flush our retransmission queue */
1453 while (!fixed_queue_is_empty(p_ccb->fcrb.retrans_q)) {
1454 osi_free(fixed_queue_try_dequeue(p_ccb->fcrb.retrans_q));
1457 if (list_ack != NULL) {
1458 node_ack = list_begin(list_ack);
1462 if (list_ack != NULL) {
1463 while (node_ack != list_end(list_ack))
1465 p_buf = (BT_HDR *)list_node(node_ack);
1466 node_ack = list_next(node_ack);
1468 BT_HDR *p_buf2 = l2c_fcr_clone_buf(p_buf, p_buf->offset, p_buf->len);
1471 p_buf2->layer_specific = p_buf->layer_specific;
1473 fixed_queue_enqueue(p_ccb->fcrb.retrans_q, p_buf2);
1476 if ( (tx_seq != L2C_FCR_RETX_ALL_PKTS) || (p_buf2 == NULL) ) {
1482 l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, NULL);
1484 if (fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q))
1486 p_ccb->fcrb.num_tries++;
1487 l2c_fcr_start_timer (p_ccb);
1494 /*******************************************************************************
1496 ** Function l2c_fcr_get_next_xmit_sdu_seg
1498 ** Description Get the next SDU segment to transmit.
1500 ** Returns pointer to buffer with segment or NULL
1502 *******************************************************************************/
1503 BT_HDR *l2c_fcr_get_next_xmit_sdu_seg (tL2C_CCB *p_ccb, UINT16 max_packet_length)
1505 assert(p_ccb != NULL);
1507 BOOLEAN first_seg = FALSE, /* The segment is the first part of data */
1508 mid_seg = FALSE, /* The segment is the middle part of data */
1509 last_seg = FALSE; /* The segment is the last part of data */
1511 BT_HDR *p_buf, *p_xmit;
1513 UINT16 max_pdu = p_ccb->tx_mps /* Needed? - L2CAP_MAX_HEADER_FCS*/;
1515 /* If there is anything in the retransmit queue, that goes first
1517 p_buf = (BT_HDR *)fixed_queue_try_dequeue(p_ccb->fcrb.retrans_q);
1518 if (p_buf != NULL) {
1519 /* Update Rx Seq and FCS if we acked some packets while this one was queued */
1520 prepare_I_frame (p_ccb, p_buf, TRUE);
1522 p_buf->event = p_ccb->local_cid;
1524 #if (L2CAP_ERTM_STATS == TRUE)
1525 p_ccb->fcrb.pkts_retransmitted++;
1526 p_ccb->fcrb.ertm_pkt_counts[0]++;
1527 p_ccb->fcrb.ertm_byte_counts[0] += (p_buf->len - 8);
1532 /* For BD/EDR controller, max_packet_length is set to 0 */
1533 /* For AMP controller, max_packet_length is set by available blocks */
1534 if ( (max_packet_length > L2CAP_MAX_HEADER_FCS)
1535 && (max_pdu + L2CAP_MAX_HEADER_FCS > max_packet_length) ) {
1536 max_pdu = max_packet_length - L2CAP_MAX_HEADER_FCS;
1539 p_buf = (BT_HDR *)fixed_queue_try_peek_first(p_ccb->xmit_hold_q);
1541 /* If there is more data than the MPS, it requires segmentation */
1542 if (p_buf->len > max_pdu) {
1543 /* We are using the "event" field to tell is if we already started segmentation */
1544 if (p_buf->event == 0) {
1546 sdu_len = p_buf->len;
1551 /* Get a new buffer and copy the data that can be sent in a PDU */
1552 p_xmit = l2c_fcr_clone_buf (p_buf, L2CAP_MIN_OFFSET + L2CAP_SDU_LEN_OFFSET,
1555 if (p_xmit != NULL) {
1556 p_buf->event = p_ccb->local_cid;
1557 p_xmit->event = p_ccb->local_cid;
1559 p_buf->len -= max_pdu;
1560 p_buf->offset += max_pdu;
1562 /* copy PBF setting */
1563 p_xmit->layer_specific = p_buf->layer_specific;
1564 } else { /* Should never happen if the application has configured buffers correctly */
1565 L2CAP_TRACE_ERROR ("L2CAP - cannot get buffer for segmentation, max_pdu: %u", max_pdu);
1568 } else { /* Use the original buffer if no segmentation, or the last segment */
1569 p_xmit = (BT_HDR *)fixed_queue_try_dequeue(p_ccb->xmit_hold_q);
1571 if (p_xmit->event != 0) {
1575 p_xmit->event = p_ccb->local_cid;
1578 /* Step back to add the L2CAP headers */
1579 p_xmit->offset -= (L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD);
1580 p_xmit->len += L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD;
1583 p_xmit->offset -= L2CAP_SDU_LEN_OVERHEAD;
1584 p_xmit->len += L2CAP_SDU_LEN_OVERHEAD;
1587 /* Set the pointer to the beginning of the data */
1588 p = (UINT8 *)(p_xmit + 1) + p_xmit->offset;
1590 /* Now the L2CAP header */
1592 /* Note: if FCS has to be included then the length is recalculated later */
1593 UINT16_TO_STREAM (p, p_xmit->len - L2CAP_PKT_OVERHEAD);
1595 UINT16_TO_STREAM (p, p_ccb->remote_cid);
1598 /* Skip control word and add SDU length */
1600 UINT16_TO_STREAM (p, sdu_len);
1602 /* We will store the SAR type in layer-specific */
1603 /* layer_specific is shared with flushable flag(bits 0-1), don't clear it */
1604 p_xmit->layer_specific |= L2CAP_FCR_START_SDU;
1607 } else if (mid_seg) {
1608 p_xmit->layer_specific |= L2CAP_FCR_CONT_SDU;
1609 } else if (last_seg) {
1610 p_xmit->layer_specific |= L2CAP_FCR_END_SDU;
1612 p_xmit->layer_specific |= L2CAP_FCR_UNSEG_SDU;
1615 prepare_I_frame (p_ccb, p_xmit, FALSE);
1617 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) {
1618 BT_HDR *p_wack = l2c_fcr_clone_buf (p_xmit, HCI_DATA_PREAMBLE_SIZE, p_xmit->len);
1621 L2CAP_TRACE_ERROR("L2CAP - no buffer for xmit cloning, CID: 0x%04x Length: %u",
1622 p_ccb->local_cid, p_xmit->len);
1624 /* We will not save the FCS in case we reconfigure and change options */
1625 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) {
1626 p_xmit->len -= L2CAP_FCS_LEN;
1629 /* Pretend we sent it and it got lost */
1630 fixed_queue_enqueue(p_ccb->fcrb.waiting_for_ack_q, p_xmit);
1633 #if (L2CAP_ERTM_STATS == TRUE)
1634 /* set timestamp at the end of tx I-frame to get acking delay */
1635 p = ((UINT8 *) (p_wack + 1)) + p_wack->offset + p_wack->len;
1636 UINT32_TO_STREAM (p, osi_time_get_os_boottime_ms());
1638 /* We will not save the FCS in case we reconfigure and change options */
1639 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) {
1640 p_wack->len -= L2CAP_FCS_LEN;
1643 p_wack->layer_specific = p_xmit->layer_specific;
1644 fixed_queue_enqueue(p_ccb->fcrb.waiting_for_ack_q, p_wack);
1647 #if (L2CAP_ERTM_STATS == TRUE)
1648 p_ccb->fcrb.ertm_pkt_counts[0]++;
1649 p_ccb->fcrb.ertm_byte_counts[0] += (p_xmit->len - 8);
1658 /*******************************************************************************
1659 ** Configuration negotiation functions
1661 ** The following functions are used in negotiating channel modes during
1663 ********************************************************************************/
1665 /*******************************************************************************
1667 ** Function l2c_fcr_chk_chan_modes
1669 ** Description Validates and adjusts if necessary, the FCR options
1670 ** based on remote EXT features.
1672 ** Note: This assumes peer EXT Features have been received.
1673 ** Basic mode is used if FCR Options have not been received
1675 ** Returns UINT8 - nonzero if can continue, '0' if no compatible channels
1677 *******************************************************************************/
1678 UINT8 l2c_fcr_chk_chan_modes (tL2C_CCB *p_ccb)
1680 assert(p_ccb != NULL);
1682 /* Remove nonbasic options that the peer does not support */
1683 if (!(p_ccb->p_lcb->peer_ext_fea & L2CAP_EXTFEA_ENH_RETRANS)) {
1684 p_ccb->ertm_info.allowed_modes &= ~L2CAP_FCR_CHAN_OPT_ERTM;
1687 if (!(p_ccb->p_lcb->peer_ext_fea & L2CAP_EXTFEA_STREAM_MODE)) {
1688 p_ccb->ertm_info.allowed_modes &= ~L2CAP_FCR_CHAN_OPT_STREAM;
1691 /* At least one type needs to be set (Basic, ERTM, STM) to continue */
1692 if (!p_ccb->ertm_info.allowed_modes) {
1693 L2CAP_TRACE_WARNING ("L2CAP - Peer does not support our desired channel types");
1696 return (p_ccb->ertm_info.allowed_modes);
1699 /*******************************************************************************
1701 ** Function l2c_fcr_adj_our_req_options
1703 ** Description Validates and sets up the FCR options passed in from
1704 ** L2CA_ConfigReq based on remote device's features.
1706 ** Returns TRUE if no errors, Otherwise FALSE
1708 *******************************************************************************/
1709 BOOLEAN l2c_fcr_adj_our_req_options (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg)
1711 assert(p_ccb != NULL);
1712 assert(p_cfg != NULL);
1714 tL2CAP_FCR_OPTS *p_fcr = &p_cfg->fcr;
1716 if (p_fcr->mode != p_ccb->ertm_info.preferred_mode) {
1717 L2CAP_TRACE_WARNING ("l2c_fcr_adj_our_req_options - preferred_mode (%d), does not match mode (%d)",
1718 p_ccb->ertm_info.preferred_mode, p_fcr->mode);
1720 /* The preferred mode is passed in through tL2CAP_ERTM_INFO, so override this one */
1721 p_fcr->mode = p_ccb->ertm_info.preferred_mode;
1724 /* If upper layer did not request eRTM mode, BASIC must be used */
1725 if (p_ccb->ertm_info.allowed_modes == L2CAP_FCR_CHAN_OPT_BASIC) {
1726 if (p_cfg->fcr_present && p_fcr->mode != L2CAP_FCR_BASIC_MODE) {
1727 L2CAP_TRACE_WARNING ("l2c_fcr_adj_our_req_options (mode %d): ERROR: No FCR options set using BASIC mode", p_fcr->mode);
1729 p_fcr->mode = L2CAP_FCR_BASIC_MODE;
1732 /* Process the FCR options if initial channel bring-up (not a reconfig request)
1733 ** Determine initial channel mode to try based on our options and remote's features
1735 if (p_cfg->fcr_present && !(p_ccb->config_done & RECONFIG_FLAG)) {
1736 /* We need to have at least one mode type common with the peer */
1737 if (!l2c_fcr_chk_chan_modes(p_ccb)) {
1738 /* Two channels have incompatible supported types */
1739 l2cu_disconnect_chnl (p_ccb);
1743 /* Basic is the only common channel mode between the two devices */
1744 else if (p_ccb->ertm_info.allowed_modes == L2CAP_FCR_CHAN_OPT_BASIC) {
1745 /* We only want to try Basic, so bypass sending the FCR options entirely */
1746 p_cfg->fcr_present = FALSE;
1747 p_cfg->fcs_present = FALSE; /* Illegal to use FCS option in basic mode */
1748 p_cfg->ext_flow_spec_present = FALSE; /* Illegal to use extended flow spec in basic mode */
1751 /* We have at least one non-basic mode available
1752 * Override mode from available mode options based on preference, if needed
1755 /* If peer does not support STREAMING, try ERTM */
1756 if (p_fcr->mode == L2CAP_FCR_STREAM_MODE && !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_STREAM)) {
1757 L2CAP_TRACE_DEBUG ("L2C CFG: mode is STREAM, but peer does not support; Try ERTM");
1758 p_fcr->mode = L2CAP_FCR_ERTM_MODE;
1761 /* If peer does not support ERTM, try BASIC (will support this if made it here in the code) */
1762 if (p_fcr->mode == L2CAP_FCR_ERTM_MODE && !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM)) {
1763 L2CAP_TRACE_DEBUG ("L2C CFG: mode is ERTM, but peer does not support; Try BASIC");
1764 p_fcr->mode = L2CAP_FCR_BASIC_MODE;
1768 if (p_fcr->mode != L2CAP_FCR_BASIC_MODE) {
1769 /* MTU must be smaller than buffer size */
1770 if ( (p_cfg->mtu_present) && (p_cfg->mtu > p_ccb->max_rx_mtu) ) {
1771 L2CAP_TRACE_WARNING ("L2CAP - MTU: %u larger than buf size: %u", p_cfg->mtu, p_ccb->max_rx_mtu);
1775 /* application want to use the default MPS */
1776 if (p_fcr->mps == L2CAP_DEFAULT_ERM_MPS) {
1777 p_fcr->mps = L2CAP_MPS_OVER_BR_EDR;
1779 /* MPS must be less than MTU */
1780 else if (p_fcr->mps > p_ccb->max_rx_mtu) {
1781 L2CAP_TRACE_WARNING ("L2CAP - MPS %u invalid MTU: %u", p_fcr->mps, p_ccb->max_rx_mtu);
1785 /* We always initially read into the HCI buffer pool, so make sure it fits */
1786 if (p_fcr->mps > (L2CAP_MTU_SIZE - L2CAP_MAX_HEADER_FCS)) {
1787 p_fcr->mps = L2CAP_MTU_SIZE - L2CAP_MAX_HEADER_FCS;
1790 p_cfg->fcs_present = FALSE; /* Illegal to use FCS option in basic mode */
1791 p_cfg->ext_flow_spec_present = FALSE; /* Illegal to use extended flow spec in basic mode */
1794 p_ccb->our_cfg.fcr = *p_fcr;
1795 } else { /* Not sure how to send a reconfiguration(??) should fcr be included? */
1796 p_ccb->our_cfg.fcr_present = FALSE;
1803 /*******************************************************************************
1805 ** Function l2c_fcr_adj_monitor_retran_timeout
1807 ** Description Overrides monitor/retrans timer value based on controller
1811 *******************************************************************************/
1812 void l2c_fcr_adj_monitor_retran_timeout (tL2C_CCB *p_ccb)
1814 assert(p_ccb != NULL);
1816 /* adjust our monitor/retran timeout */
1817 if (p_ccb->out_cfg_fcr_present) {
1819 ** if we requestd ERTM or accepted ERTM
1820 ** We may accept ERTM even if we didn't request ERTM, in case of requesting STREAM
1822 if ((p_ccb->our_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE)
1823 || (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE)) {
1824 /* upper layer setting is ignored */
1825 p_ccb->our_cfg.fcr.mon_tout = L2CAP_MIN_MONITOR_TOUT;
1826 p_ccb->our_cfg.fcr.rtrans_tout = L2CAP_MIN_RETRANS_TOUT;
1828 p_ccb->our_cfg.fcr.mon_tout = 0;
1829 p_ccb->our_cfg.fcr.rtrans_tout = 0;
1832 L2CAP_TRACE_DEBUG ("l2c_fcr_adj_monitor_retran_timeout: mon_tout:%d, rtrans_tout:%d",
1833 p_ccb->our_cfg.fcr.mon_tout, p_ccb->our_cfg.fcr.rtrans_tout);
1836 /*******************************************************************************
1838 ** Function l2c_fcr_adj_our_rsp_options
1840 ** Description Overrides any neccesary FCR options passed in from
1841 ** L2CA_ConfigRsp based on our FCR options.
1842 ** Only makes adjustments if channel is in ERTM mode.
1846 *******************************************************************************/
1847 void l2c_fcr_adj_our_rsp_options (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg)
1849 assert(p_ccb != NULL);
1850 assert(p_cfg != NULL);
1852 /* adjust our monitor/retran timeout */
1853 l2c_fcr_adj_monitor_retran_timeout(p_ccb);
1855 p_cfg->fcr_present = p_ccb->out_cfg_fcr_present;
1857 if (p_cfg->fcr_present) {
1859 /* Temporary - until a better algorithm is implemented */
1860 /* 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. */
1861 /* Note: peer is not guaranteed to obey our adjustment */
1862 if (p_ccb->peer_cfg.fcr.tx_win_sz > p_ccb->our_cfg.fcr.tx_win_sz) {
1863 L2CAP_TRACE_DEBUG ("%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);
1864 p_ccb->peer_cfg.fcr.tx_win_sz = p_ccb->our_cfg.fcr.tx_win_sz;
1868 p_cfg->fcr.mode = p_ccb->peer_cfg.fcr.mode;
1869 p_cfg->fcr.tx_win_sz = p_ccb->peer_cfg.fcr.tx_win_sz;
1870 p_cfg->fcr.max_transmit = p_ccb->peer_cfg.fcr.max_transmit;
1871 p_cfg->fcr.mps = p_ccb->peer_cfg.fcr.mps;
1872 p_cfg->fcr.rtrans_tout = p_ccb->our_cfg.fcr.rtrans_tout;
1873 p_cfg->fcr.mon_tout = p_ccb->our_cfg.fcr.mon_tout;
1877 /*******************************************************************************
1879 ** Function l2c_fcr_renegotiate_chan
1881 ** Description Called upon unsuccessful peer response to config request.
1882 ** If the error is because of the channel mode, it will try
1883 ** to resend using another supported optional channel.
1885 ** Returns TRUE if resent configuration, False if channel matches or
1888 *******************************************************************************/
1889 BOOLEAN l2c_fcr_renegotiate_chan(tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg)
1891 assert(p_ccb != NULL);
1892 assert(p_cfg != NULL);
1894 UINT8 peer_mode = p_ccb->our_cfg.fcr.mode;
1895 BOOLEAN can_renegotiate;
1897 /* Skip if this is a reconfiguration from OPEN STATE or if FCR is not returned */
1898 if (!p_cfg->fcr_present || (p_ccb->config_done & RECONFIG_FLAG)) {
1902 /* Only retry if there are more channel options to try */
1903 if (p_cfg->result == L2CAP_CFG_UNACCEPTABLE_PARAMS) {
1904 peer_mode = (p_cfg->fcr_present) ? p_cfg->fcr.mode : L2CAP_FCR_BASIC_MODE;
1906 if (p_ccb->our_cfg.fcr.mode != peer_mode) {
1908 if ((--p_ccb->fcr_cfg_tries) == 0) {
1909 p_cfg->result = L2CAP_CFG_FAILED_NO_REASON;
1910 L2CAP_TRACE_WARNING ("l2c_fcr_renegotiate_chan (Max retries exceeded)");
1913 can_renegotiate = FALSE;
1915 /* Try another supported mode if available based on our last attempted channel */
1916 switch (p_ccb->our_cfg.fcr.mode) {
1917 /* Our Streaming mode request was unnacceptable; try ERTM or Basic */
1918 case L2CAP_FCR_STREAM_MODE:
1919 /* Peer wants ERTM and we support it */
1920 if ( (peer_mode == L2CAP_FCR_ERTM_MODE) && (p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM) ) {
1921 L2CAP_TRACE_DEBUG ("l2c_fcr_renegotiate_chan(Trying ERTM)");
1922 p_ccb->our_cfg.fcr.mode = L2CAP_FCR_ERTM_MODE;
1923 can_renegotiate = TRUE;
1924 } else /* Falls through */
1926 case L2CAP_FCR_ERTM_MODE: {
1927 /* We can try basic for any other peer mode if we support it */
1928 if (p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_BASIC) {
1929 L2CAP_TRACE_DEBUG ("l2c_fcr_renegotiate_chan(Trying Basic)");
1930 can_renegotiate = TRUE;
1931 p_ccb->our_cfg.fcr.mode = L2CAP_FCR_BASIC_MODE;
1937 /* All other scenarios cannot be renegotiated */
1941 if (can_renegotiate) {
1942 p_ccb->our_cfg.fcr_present = TRUE;
1944 if (p_ccb->our_cfg.fcr.mode == L2CAP_FCR_BASIC_MODE) {
1945 p_ccb->our_cfg.fcs_present = FALSE;
1946 p_ccb->our_cfg.ext_flow_spec_present = FALSE;
1948 /* Basic Mode uses ACL Data Pool, make sure the MTU fits */
1949 if ( (p_cfg->mtu_present) && (p_cfg->mtu > L2CAP_MTU_SIZE) ) {
1950 L2CAP_TRACE_WARNING ("L2CAP - adjust MTU: %u too large", p_cfg->mtu);
1951 p_cfg->mtu = L2CAP_MTU_SIZE;
1955 l2cu_process_our_cfg_req (p_ccb, &p_ccb->our_cfg);
1956 l2cu_send_peer_config_req (p_ccb, &p_ccb->our_cfg);
1957 btu_start_timer (&p_ccb->timer_entry, BTU_TTYPE_L2CAP_CHNL, L2CAP_CHNL_CFG_TIMEOUT);
1963 /* Disconnect if the channels do not match */
1964 if (p_ccb->our_cfg.fcr.mode != peer_mode) {
1965 L2CAP_TRACE_WARNING ("L2C CFG: Channels incompatible (local %d, peer %d)",
1966 p_ccb->our_cfg.fcr.mode, peer_mode);
1967 l2cu_disconnect_chnl (p_ccb);
1974 /*******************************************************************************
1976 ** Function l2c_fcr_process_peer_cfg_req
1978 ** Description This function is called to process the FCR options passed
1979 ** in the peer's configuration request.
1981 ** Returns UINT8 - L2CAP_PEER_CFG_OK, L2CAP_PEER_CFG_UNACCEPTABLE,
1982 ** or L2CAP_PEER_CFG_DISCONNECT.
1984 *******************************************************************************/
1985 UINT8 l2c_fcr_process_peer_cfg_req(tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg)
1987 assert(p_ccb != NULL);
1988 assert(p_cfg != NULL);
1990 UINT16 max_retrans_size;
1991 UINT8 fcr_ok = L2CAP_PEER_CFG_OK;
1993 p_ccb->p_lcb->w4_info_rsp = FALSE; /* Handles T61x SonyEricsson Bug in Info Request */
1995 L2CAP_TRACE_EVENT ("l2c_fcr_process_peer_cfg_req() CFG fcr_present:%d fcr.mode:%d CCB FCR mode:%d preferred: %u allowed:%u",
1996 p_cfg->fcr_present, p_cfg->fcr.mode, p_ccb->our_cfg.fcr.mode, p_ccb->ertm_info.preferred_mode,
1997 p_ccb->ertm_info.allowed_modes);
1999 /* If Peer wants basic, we are done (accept it or disconnect) */
2000 if (p_cfg->fcr.mode == L2CAP_FCR_BASIC_MODE) {
2001 /* If we do not allow basic, disconnect */
2002 if ( !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_BASIC) ) {
2003 fcr_ok = L2CAP_PEER_CFG_DISCONNECT;
2007 /* Need to negotiate if our modes are not the same */
2008 else if (p_cfg->fcr.mode != p_ccb->ertm_info.preferred_mode) {
2009 /* If peer wants a mode that we don't support then retry our mode (ex. rtx/flc), OR
2010 ** If we want ERTM and they wanted streaming retry our mode.
2011 ** Note: If we have already determined they support our mode previously
2012 ** from their EXF mask.
2014 if ( (((1 << p_cfg->fcr.mode) & L2CAP_FCR_CHAN_OPT_ALL_MASK) == 0)
2015 || (p_ccb->ertm_info.preferred_mode == L2CAP_FCR_ERTM_MODE) ) {
2016 p_cfg->fcr.mode = p_ccb->our_cfg.fcr.mode;
2017 p_cfg->fcr.tx_win_sz = p_ccb->our_cfg.fcr.tx_win_sz;
2018 p_cfg->fcr.max_transmit = p_ccb->our_cfg.fcr.max_transmit;
2019 fcr_ok = L2CAP_PEER_CFG_UNACCEPTABLE;
2022 /* If we wanted basic, then try to renegotiate it */
2023 else if (p_ccb->ertm_info.preferred_mode == L2CAP_FCR_BASIC_MODE) {
2024 p_cfg->fcr.mode = L2CAP_FCR_BASIC_MODE;
2025 p_cfg->fcr.max_transmit = p_cfg->fcr.tx_win_sz = 0;
2026 p_cfg->fcr.rtrans_tout = p_cfg->fcr.mon_tout = p_cfg->fcr.mps = 0;
2027 p_ccb->our_cfg.fcr.rtrans_tout = p_ccb->our_cfg.fcr.mon_tout = p_ccb->our_cfg.fcr.mps = 0;
2028 fcr_ok = L2CAP_PEER_CFG_UNACCEPTABLE;
2031 /* Only other valid case is if they want ERTM and we wanted STM which should be
2032 accepted if we support it; otherwise the channel should be disconnected */
2033 else if ( (p_cfg->fcr.mode != L2CAP_FCR_ERTM_MODE)
2034 || !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM) ) {
2035 fcr_ok = L2CAP_PEER_CFG_DISCONNECT;
2039 /* Configuration for FCR channels so make any adjustments and fwd to upper layer */
2040 if (fcr_ok == L2CAP_PEER_CFG_OK) {
2041 /* by default don't need to send params in the response */
2042 p_ccb->out_cfg_fcr_present = FALSE;
2044 /* Make any needed adjustments for the response to the peer */
2045 if (p_cfg->fcr_present && p_cfg->fcr.mode != L2CAP_FCR_BASIC_MODE) {
2046 /* Peer desires to bypass FCS check, and streaming or ERTM mode */
2047 if (p_cfg->fcs_present) {
2048 p_ccb->peer_cfg.fcs = p_cfg->fcs;
2049 p_ccb->peer_cfg_bits |= L2CAP_CH_CFG_MASK_FCS;
2050 if ( p_cfg->fcs == L2CAP_CFG_FCS_BYPASS) {
2051 p_ccb->bypass_fcs |= L2CAP_CFG_FCS_PEER;
2055 max_retrans_size = p_ccb->ertm_info.fcr_tx_buf_size - sizeof(BT_HDR)
2056 - L2CAP_MIN_OFFSET - L2CAP_SDU_LEN_OFFSET - L2CAP_FCS_LEN;
2058 /* Ensure the MPS is not bigger than the MTU */
2059 if ( (p_cfg->fcr.mps == 0) || (p_cfg->fcr.mps > p_ccb->peer_cfg.mtu) ) {
2060 p_cfg->fcr.mps = p_ccb->peer_cfg.mtu;
2061 p_ccb->out_cfg_fcr_present = TRUE;
2064 /* Ensure the MPS is not bigger than our retransmission buffer */
2065 if (p_cfg->fcr.mps > max_retrans_size) {
2066 L2CAP_TRACE_DEBUG("CFG: Overriding MPS to %d (orig %d)", max_retrans_size, p_cfg->fcr.mps);
2068 p_cfg->fcr.mps = max_retrans_size;
2069 p_ccb->out_cfg_fcr_present = TRUE;
2072 if (p_cfg->fcr.mode == L2CAP_FCR_ERTM_MODE || p_cfg->fcr.mode == L2CAP_FCR_STREAM_MODE) {
2073 /* Always respond with FCR ERTM parameters */
2074 p_ccb->out_cfg_fcr_present = TRUE;
2078 /* Everything ok, so save the peer's adjusted fcr options */
2079 p_ccb->peer_cfg.fcr = p_cfg->fcr;
2081 if (p_cfg->fcr_present) {
2082 p_ccb->peer_cfg_bits |= L2CAP_CH_CFG_MASK_FCR;
2084 } else if (fcr_ok == L2CAP_PEER_CFG_UNACCEPTABLE) {
2085 /* Allow peer only one retry for mode */
2086 if (p_ccb->peer_cfg_already_rejected) {
2087 fcr_ok = L2CAP_PEER_CFG_DISCONNECT;
2089 p_ccb->peer_cfg_already_rejected = TRUE;
2096 #if (L2CAP_ERTM_STATS == TRUE)
2097 /*******************************************************************************
2099 ** Function l2c_fcr_collect_ack_delay
2101 ** Description collect throughput, delay, queue size of waiting ack
2108 *******************************************************************************/
2109 static void l2c_fcr_collect_ack_delay (tL2C_CCB *p_ccb, UINT8 num_bufs_acked)
2114 UINT32 timestamp, delay;
2118 index = p_ccb->fcrb.ack_delay_avg_index;
2120 /* update sum, max and min of waiting for ack queue size */
2121 p_ccb->fcrb.ack_q_count_avg[index] +=
2122 fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q);
2124 if (fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q) > p_ccb->fcrb.ack_q_count_max[index]) {
2125 p_ccb->fcrb.ack_q_count_max[index] = fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q);
2128 if (fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q) < p_ccb->fcrb.ack_q_count_min[index]) {
2129 p_ccb->fcrb.ack_q_count_min[index] = fixed_queue_length(p_ccb->fcrb.waiting_for_ack_q);
2132 /* update sum, max and min of round trip delay of acking */
2133 list_t *list = NULL;
2134 if (! fixed_queue_is_empty(p_ccb->fcrb.waiting_for_ack_q))
2135 list = fixed_queue_get_list(p_ccb->fcrb.waiting_for_ack_q);
2137 for (const list_node_t *node = list_begin(list), xx = 0;
2138 (node != list_end(list)) && (xx < num_bufs_acked);
2139 node = list_next(node), xx++) {
2140 p_buf = list_node(node);
2141 /* adding up length of acked I-frames to get throughput */
2142 p_ccb->fcrb.throughput[index] += p_buf->len - 8;
2144 if ( xx == num_bufs_acked - 1 ) {
2145 /* get timestamp from tx I-frame that receiver is acking */
2146 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + p_buf->len;
2147 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) {
2151 STREAM_TO_UINT32(timestamp, p);
2152 delay = osi_time_get_os_boottime_ms() - timestamp;
2154 p_ccb->fcrb.ack_delay_avg[index] += delay;
2155 if ( delay > p_ccb->fcrb.ack_delay_max[index] ) {
2156 p_ccb->fcrb.ack_delay_max[index] = delay;
2158 if ( delay < p_ccb->fcrb.ack_delay_min[index] ) {
2159 p_ccb->fcrb.ack_delay_min[index] = delay;
2165 p_ccb->fcrb.ack_delay_avg_count++;
2167 /* calculate average and initialize next avg, min and max */
2168 if (p_ccb->fcrb.ack_delay_avg_count > L2CAP_ERTM_STATS_AVG_NUM_SAMPLES) {
2169 p_ccb->fcrb.ack_delay_avg_count = 0;
2171 p_ccb->fcrb.ack_q_count_avg[index] /= L2CAP_ERTM_STATS_AVG_NUM_SAMPLES;
2172 p_ccb->fcrb.ack_delay_avg[index] /= L2CAP_ERTM_STATS_AVG_NUM_SAMPLES;
2174 /* calculate throughput */
2175 timestamp = osi_time_get_os_boottime_ms();
2176 if (timestamp - p_ccb->fcrb.throughput_start > 0 ) {
2177 p_ccb->fcrb.throughput[index] /= (timestamp - p_ccb->fcrb.throughput_start);
2180 p_ccb->fcrb.throughput_start = timestamp;
2182 sprintf(str, "[%02u] throughput: %5u, ack_delay avg:%3u, min:%3u, max:%3u, ack_q_count avg:%3u, min:%3u, max:%3u",
2183 index, p_ccb->fcrb.throughput[index],
2184 p_ccb->fcrb.ack_delay_avg[index], p_ccb->fcrb.ack_delay_min[index], p_ccb->fcrb.ack_delay_max[index],
2185 p_ccb->fcrb.ack_q_count_avg[index], p_ccb->fcrb.ack_q_count_min[index], p_ccb->fcrb.ack_q_count_max[index] );
2187 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", str);
2189 index = (index + 1) % L2CAP_ERTM_STATS_NUM_AVG;
2190 p_ccb->fcrb.ack_delay_avg_index = index;
2192 p_ccb->fcrb.ack_q_count_max[index] = 0;
2193 p_ccb->fcrb.ack_q_count_min[index] = 0xFFFFFFFF;
2194 p_ccb->fcrb.ack_q_count_avg[index] = 0;
2197 p_ccb->fcrb.ack_delay_max[index] = 0;
2198 p_ccb->fcrb.ack_delay_min[index] = 0xFFFFFFFF;
2199 p_ccb->fcrb.ack_delay_avg[index] = 0;
2201 p_ccb->fcrb.throughput[index] = 0;
2205 #endif ///CLASSIC_BT_INCLUDED == TRUE