l2c_fcr.c revision c0a87fe60f79ddf41595a30e75a77f43c19cd323
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 <assert.h> 27#include <stdio.h> 28#include <stdlib.h> 29#include <string.h> 30 31#include "bt_types.h" 32#include "gki.h" 33#include "hcimsgs.h" 34#include "l2c_api.h" 35#include "l2c_int.h" 36#include "l2cdefs.h" 37#include "btm_api.h" 38#include "btm_int.h" 39#include "btu.h" 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 45static char *SAR_types[] = { "Unsegmented", "Start", "End", "Continuation" }; 46static char *SUP_types[] = { "RR", "REJ", "RNR", "SREJ" }; 47#endif 48 49/* Look-up table for the CRC calculation */ 50static 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*/ 89static BOOLEAN process_reqseq (tL2C_CCB *p_ccb, UINT16 ctrl_word); 90static void process_s_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word); 91static void process_i_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word, BOOLEAN delay_ack); 92static BOOLEAN retransmit_i_frames (tL2C_CCB *p_ccb, UINT8 tx_seq); 93static void prepare_I_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, BOOLEAN is_retransmission); 94static void process_stream_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf); 95static BOOLEAN do_sar_reassembly (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word); 96 97#if (L2CAP_ERTM_STATS == TRUE) 98static void l2c_fcr_collect_ack_delay (tL2C_CCB *p_ccb, UINT8 num_bufs_acked); 99#endif 100 101/******************************************************************************* 102** 103** Function l2c_fcr_updcrc 104** 105** Description This function computes the CRC using the look-up table. 106** 107** Returns CRC 108** 109*******************************************************************************/ 110static unsigned short l2c_fcr_updcrc(unsigned short icrc, unsigned char *icp, int icnt) 111{ 112 register unsigned short crc = icrc; 113 register unsigned char *cp = icp; 114 register int cnt = icnt; 115 116 while (cnt--) 117 { 118 crc = ((crc >> 8) & 0xff) ^ crctab[(crc & 0xff) ^ *cp++]; 119 } 120 121 return(crc); 122} 123 124 125/******************************************************************************* 126** 127** Function l2c_fcr_tx_get_fcs 128** 129** Description This function computes the CRC for a frame to be TXed. 130** 131** Returns CRC 132** 133*******************************************************************************/ 134static UINT16 l2c_fcr_tx_get_fcs (BT_HDR *p_buf) 135{ 136 UINT8 *p = ((UINT8 *) (p_buf + 1)) + p_buf->offset; 137 138 return (l2c_fcr_updcrc (L2CAP_FCR_INIT_CRC, p, p_buf->len)); 139} 140 141/******************************************************************************* 142** 143** Function l2c_fcr_rx_get_fcs 144** 145** Description This function computes the CRC for a received frame. 146** 147** Returns CRC 148** 149*******************************************************************************/ 150static UINT16 l2c_fcr_rx_get_fcs (BT_HDR *p_buf) 151{ 152 UINT8 *p = ((UINT8 *) (p_buf + 1)) + p_buf->offset; 153 154 /* offset points past the L2CAP header, but the CRC check includes it */ 155 p -= L2CAP_PKT_OVERHEAD; 156 157 return (l2c_fcr_updcrc (L2CAP_FCR_INIT_CRC, p, p_buf->len + L2CAP_PKT_OVERHEAD)); 158} 159 160/******************************************************************************* 161** 162** Function l2c_fcr_start_timer 163** 164** Description This function starts the (monitor or retransmission) timer. 165** 166** Returns - 167** 168*******************************************************************************/ 169void l2c_fcr_start_timer (tL2C_CCB *p_ccb) 170{ 171 assert(p_ccb != NULL); 172 UINT32 tout; 173 174 /* The timers which are in milliseconds */ 175 if (p_ccb->fcrb.wait_ack) 176 { 177 tout = (UINT32)p_ccb->our_cfg.fcr.mon_tout; 178 } 179 else 180 { 181 tout = (UINT32)p_ccb->our_cfg.fcr.rtrans_tout; 182 } 183 184 /* Only start a timer that was not started */ 185 if (p_ccb->fcrb.mon_retrans_timer.in_use == 0) 186 btu_start_quick_timer (&p_ccb->fcrb.mon_retrans_timer, BTU_TTYPE_L2CAP_CHNL, tout*QUICK_TIMER_TICKS_PER_SEC/1000); 187} 188 189/******************************************************************************* 190** 191** Function l2c_fcr_stop_timer 192** 193** Description This function stops the (monitor or transmission) timer. 194** 195** Returns - 196** 197*******************************************************************************/ 198void l2c_fcr_stop_timer (tL2C_CCB *p_ccb) 199{ 200 assert(p_ccb != NULL); 201 if (p_ccb->fcrb.mon_retrans_timer.in_use) 202 { 203 btu_stop_quick_timer (&p_ccb->fcrb.mon_retrans_timer); 204 } 205} 206 207/******************************************************************************* 208** 209** Function l2c_fcr_cleanup 210** 211** Description This function cleans up the variable used for flow-control/retrans. 212** 213** Returns - 214** 215*******************************************************************************/ 216void l2c_fcr_cleanup (tL2C_CCB *p_ccb) 217{ 218 assert(p_ccb != NULL); 219 tL2C_FCRB *p_fcrb = &p_ccb->fcrb; 220 221 l2c_fcr_stop_timer (p_ccb); 222 223 if (p_fcrb->p_rx_sdu) 224 GKI_freebuf (p_fcrb->p_rx_sdu); 225 226 while (!GKI_queue_is_empty(&p_fcrb->waiting_for_ack_q)) 227 GKI_freebuf (GKI_dequeue (&p_fcrb->waiting_for_ack_q)); 228 229 while (!GKI_queue_is_empty(&p_fcrb->srej_rcv_hold_q)) 230 GKI_freebuf (GKI_dequeue (&p_fcrb->srej_rcv_hold_q)); 231 232 while (!GKI_queue_is_empty(&p_fcrb->retrans_q)) 233 GKI_freebuf (GKI_dequeue (&p_fcrb->retrans_q)); 234 235 btu_stop_quick_timer (&p_fcrb->ack_timer); 236 btu_stop_quick_timer (&p_ccb->fcrb.mon_retrans_timer); 237 238#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 { 241 UINT32 dur = GKI_get_os_tick_count() - p_ccb->fcrb.connect_tick_count; 242 char *p_str = (char *)GKI_getbuf(120); 243 UINT16 i; 244 UINT32 throughput_avg, ack_delay_avg, ack_q_count_avg; 245 246 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, 247 "--- L2CAP ERTM Stats for CID: 0x%04x Duration: %08ums", p_ccb->local_cid, dur); 248 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, 249 "Retransmissions:%08u Times Flow Controlled:%08u Retrans Touts:%08u Ack Touts:%08u", 250 p_ccb->fcrb.pkts_retransmitted, p_ccb->fcrb.xmit_window_closed, p_ccb->fcrb.retrans_touts, p_ccb->fcrb.xmit_ack_touts); 251 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, 252 "Times there is less than 2 packets in controller when flow controlled:%08u", p_ccb->fcrb.controller_idle); 253 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, 254 "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 if (p_str) 256 { 257 sprintf(p_str, "Sent Pkts:%08u Bytes:%10u(%06u/sec) RR:%08u REJ:%08u RNR:%08u SREJ:%08u", 258 p_ccb->fcrb.ertm_pkt_counts[0], p_ccb->fcrb.ertm_byte_counts[0], 259 (dur >= 10 ? (p_ccb->fcrb.ertm_byte_counts[0] * 100) / (dur / 10) : 0), 260 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]); 261 262 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", p_str); 263 264 sprintf(p_str, "Rcvd Pkts:%08u Bytes:%10u(%06u/sec) RR:%08u REJ:%08u RNR:%08u SREJ:%08u", 265 p_ccb->fcrb.ertm_pkt_counts[1], p_ccb->fcrb.ertm_byte_counts[1], 266 (dur >= 10 ? (p_ccb->fcrb.ertm_byte_counts[1] * 100) / (dur / 10) : 0), 267 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]); 268 269 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", p_str); 270 271 throughput_avg = 0; 272 ack_delay_avg = 0; 273 ack_q_count_avg = 0; 274 275 for (i = 0; i < L2CAP_ERTM_STATS_NUM_AVG; i++ ) 276 { 277 if (i == p_ccb->fcrb.ack_delay_avg_index ) 278 { 279 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, 280 "[%02u] collecting data ...", i ); 281 continue; 282 } 283 284 sprintf(p_str, "[%02u] throughput: %5u, ack_delay avg:%3u, min:%3u, max:%3u, ack_q_count avg:%3u, min:%3u, max:%3u", 285 i, p_ccb->fcrb.throughput[i], 286 p_ccb->fcrb.ack_delay_avg[i], p_ccb->fcrb.ack_delay_min[i], p_ccb->fcrb.ack_delay_max[i], 287 p_ccb->fcrb.ack_q_count_avg[i], p_ccb->fcrb.ack_q_count_min[i], p_ccb->fcrb.ack_q_count_max[i] ); 288 289 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", p_str); 290 291 throughput_avg += p_ccb->fcrb.throughput[i]; 292 ack_delay_avg += p_ccb->fcrb.ack_delay_avg[i]; 293 ack_q_count_avg += p_ccb->fcrb.ack_q_count_avg[i]; 294 } 295 296 throughput_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1); 297 ack_delay_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1); 298 ack_q_count_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1); 299 300 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, 301 "throughput_avg: %8u (kbytes/sec), ack_delay_avg: %8u ms, ack_q_count_avg: %8u", 302 throughput_avg, ack_delay_avg, ack_q_count_avg ); 303 304 GKI_freebuf(p_str); 305 } 306 307 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, 308 "---"); 309 } 310#endif 311 312 memset (p_fcrb, 0, sizeof (tL2C_FCRB)); 313} 314 315/******************************************************************************* 316** 317** Function l2c_fcr_clone_buf 318** 319** Description This function allocates and copies requested part of a buffer 320** at a new-offset. 321** 322** Returns pointer to new buffer 323** 324*******************************************************************************/ 325BT_HDR *l2c_fcr_clone_buf (BT_HDR *p_buf, UINT16 new_offset, UINT16 no_of_bytes, UINT8 pool) 326{ 327 assert(p_buf != NULL); 328 BT_HDR *p_buf2; 329 330 /* If using the common pool, should be at least 10% free. */ 331 if ( (pool == HCI_ACL_POOL_ID) && (GKI_poolutilization (pool) > 90) ) 332 { 333 L2CAP_TRACE_ERROR ("L2CAP - failed to clone buffer on HCI_ACL_POOL_ID Utilization: %u", GKI_poolutilization(pool)); 334 return (NULL); 335 } 336 337 if ((p_buf2 = (BT_HDR *)GKI_getpoolbuf(pool)) != NULL) 338 { 339 UINT16 pool_buf_size = GKI_get_pool_bufsize (pool); 340 341 /* Make sure buffer fits into buffer pool */ 342 if ((no_of_bytes + sizeof(BT_HDR) + new_offset) > pool_buf_size) 343 { 344 L2CAP_TRACE_ERROR("##### l2c_fcr_clone_buf (NumBytes %d) -> Exceeds poolsize %d [bytes %d + BT_HDR %d + offset %d]", 345 (no_of_bytes + sizeof(BT_HDR) + new_offset), 346 pool_buf_size, no_of_bytes, sizeof(BT_HDR), 347 new_offset); 348 349 GKI_freebuf(p_buf2); 350 return (NULL); 351 } 352 353 p_buf2->offset = new_offset; 354 p_buf2->len = no_of_bytes; 355 356 memcpy (((UINT8 *)(p_buf2 + 1)) + p_buf2->offset, 357 ((UINT8 *)(p_buf + 1)) + p_buf->offset, 358 no_of_bytes); 359 } 360 else 361 { 362 L2CAP_TRACE_ERROR ("L2CAP - failed to clone buffer, Pool: %u Count: %u", pool, GKI_poolfreecount(pool)); 363 } 364 365 return (p_buf2); 366} 367 368/******************************************************************************* 369** 370** Function l2c_fcr_is_flow_controlled 371** 372** Description This function checks if the CCB is flow controlled by peer. 373** 374** Returns The control word 375** 376*******************************************************************************/ 377BOOLEAN l2c_fcr_is_flow_controlled (tL2C_CCB *p_ccb) 378{ 379 assert(p_ccb != NULL); 380 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) 381 { 382 /* Check if remote side flowed us off or the transmit window is full */ 383 if ( (p_ccb->fcrb.remote_busy == TRUE) 384 || (GKI_queue_length(&p_ccb->fcrb.waiting_for_ack_q) >= p_ccb->peer_cfg.fcr.tx_win_sz) ) 385 { 386#if (L2CAP_ERTM_STATS == TRUE) 387 if (!GKI_queue_is_empty(&p_ccb->xmit_hold_q)) 388 { 389 p_ccb->fcrb.xmit_window_closed++; 390 391 if ((p_ccb->p_lcb->sent_not_acked < 2)&&(l2cb.controller_xmit_window > 0)) 392 p_ccb->fcrb.controller_idle++; 393 } 394#endif 395 return (TRUE); 396 } 397 } 398 return (FALSE); 399} 400 401/******************************************************************************* 402** 403** Function prepare_I_frame 404** 405** Description This function sets the FCR variables in an I-frame that is 406** about to be sent to HCI for transmission. This may be the 407** first time the I-frame is sent, or a retransmission 408** 409** Returns - 410** 411*******************************************************************************/ 412static void prepare_I_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, BOOLEAN is_retransmission) 413{ 414 assert(p_ccb != NULL); 415 assert(p_buf != NULL); 416 tL2C_FCRB *p_fcrb = &p_ccb->fcrb; 417 UINT8 *p; 418 UINT16 fcs; 419 UINT16 ctrl_word; 420 BOOLEAN set_f_bit = p_fcrb->send_f_rsp; 421 422 p_fcrb->send_f_rsp = FALSE; 423 424 if (is_retransmission) 425 { 426 /* Get the old control word and clear out the old req_seq and F bits */ 427 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + L2CAP_PKT_OVERHEAD; 428 429 STREAM_TO_UINT16 (ctrl_word, p); 430 431 ctrl_word &= ~(L2CAP_FCR_REQ_SEQ_BITS + L2CAP_FCR_F_BIT); 432 } 433 else 434 { 435 ctrl_word = p_buf->layer_specific & L2CAP_FCR_SEG_BITS; /* SAR bits */ 436 ctrl_word |= (p_fcrb->next_tx_seq << L2CAP_FCR_TX_SEQ_BITS_SHIFT); /* Tx Seq */ 437 438 p_fcrb->next_tx_seq = (p_fcrb->next_tx_seq + 1) & L2CAP_FCR_SEQ_MODULO; 439 } 440 441 /* Set the F-bit and reqseq only if using re-transmission mode */ 442 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) 443 { 444 if (set_f_bit) 445 ctrl_word |= L2CAP_FCR_F_BIT; 446 447 ctrl_word |= (p_fcrb->next_seq_expected) << L2CAP_FCR_REQ_SEQ_BITS_SHIFT; 448 449 p_fcrb->last_ack_sent = p_ccb->fcrb.next_seq_expected; 450 451 if (p_ccb->fcrb.ack_timer.in_use) 452 btu_stop_quick_timer (&p_ccb->fcrb.ack_timer); 453 } 454 455 /* Set the control word */ 456 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + L2CAP_PKT_OVERHEAD; 457 458 UINT16_TO_STREAM (p, ctrl_word); 459 460 /* Compute the FCS and add to the end of the buffer if not bypassed */ 461 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) 462 { 463 /* length field in l2cap header has to include FCS length */ 464 p = ((UINT8 *) (p_buf+1)) + p_buf->offset; 465 UINT16_TO_STREAM (p, p_buf->len + L2CAP_FCS_LEN - L2CAP_PKT_OVERHEAD); 466 467 /* Calculate the FCS */ 468 fcs = l2c_fcr_tx_get_fcs(p_buf); 469 470 /* Point to the end of the buffer and put the FCS there */ 471 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + p_buf->len; 472 473 UINT16_TO_STREAM (p, fcs); 474 475 p_buf->len += L2CAP_FCS_LEN; 476 } 477 478#if BT_TRACE_VERBOSE == TRUE 479 if (is_retransmission) 480 { 481 L2CAP_TRACE_EVENT ("L2CAP eRTM ReTx I-frame CID: 0x%04x Len: %u SAR: %s TxSeq: %u ReqSeq: %u F: %u", 482 p_ccb->local_cid, p_buf->len, 483 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT], 484 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT, 485 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, 486 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); 487 } 488 else 489 { 490 L2CAP_TRACE_EVENT ("L2CAP eRTM Tx I-frame CID: 0x%04x Len: %u SAR: %-12s TxSeq: %u ReqSeq: %u F: %u", 491 p_ccb->local_cid, p_buf->len, 492 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT], 493 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT, 494 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, 495 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); 496 } 497#endif 498 499 /* Start the retransmission timer if not already running */ 500 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) 501 l2c_fcr_start_timer (p_ccb); 502} 503 504/******************************************************************************* 505** 506** Function l2c_fcr_send_S_frame 507** 508** Description This function formats and sends an S-frame for transmission. 509** 510** Returns - 511** 512*******************************************************************************/ 513void l2c_fcr_send_S_frame (tL2C_CCB *p_ccb, UINT16 function_code, UINT16 pf_bit) 514{ 515 assert(p_ccb != NULL); 516 BT_HDR *p_buf; 517 UINT8 *p; 518 UINT16 ctrl_word; 519 UINT16 fcs; 520 521 if ((!p_ccb->in_use) || (p_ccb->chnl_state != CST_OPEN)) 522 return; 523 524#if (L2CAP_ERTM_STATS == TRUE) 525 p_ccb->fcrb.s_frames_sent[function_code]++; 526#endif 527 528 if (pf_bit == L2CAP_FCR_P_BIT) 529 { 530 p_ccb->fcrb.wait_ack = TRUE; 531 532 l2c_fcr_stop_timer (p_ccb); /* Restart the monitor timer */ 533 l2c_fcr_start_timer (p_ccb); 534 } 535 536 /* Create the control word to use */ 537 ctrl_word = (function_code << L2CAP_FCR_SUP_SHIFT) | L2CAP_FCR_S_FRAME_BIT; 538 ctrl_word |= (p_ccb->fcrb.next_seq_expected << L2CAP_FCR_REQ_SEQ_BITS_SHIFT); 539 ctrl_word |= pf_bit; 540 541 if ((p_buf = (BT_HDR *)GKI_getpoolbuf (L2CAP_CMD_POOL_ID)) != NULL) 542 { 543 p_buf->offset = HCI_DATA_PREAMBLE_SIZE; 544 p_buf->len = L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD; 545 546 /* Set the pointer to the beginning of the data */ 547 p = (UINT8 *)(p_buf + 1) + p_buf->offset; 548 549 /* Put in the L2CAP header */ 550 UINT16_TO_STREAM (p, L2CAP_FCR_OVERHEAD + L2CAP_FCS_LEN); 551 UINT16_TO_STREAM (p, p_ccb->remote_cid); 552 UINT16_TO_STREAM (p, ctrl_word); 553 554 /* Compute the FCS and add to the end of the buffer if not bypassed */ 555 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) 556 { 557 fcs = l2c_fcr_tx_get_fcs (p_buf); 558 559 UINT16_TO_STREAM (p, fcs); 560 p_buf->len += L2CAP_FCS_LEN; 561 } 562 else /* rewrite the length without FCS length */ 563 { 564 p -= 6; 565 UINT16_TO_STREAM (p, L2CAP_FCR_OVERHEAD); 566 } 567 568 /* Now, the HCI transport header */ 569 p_buf->layer_specific = L2CAP_NON_FLUSHABLE_PKT; 570 l2cu_set_acl_hci_header (p_buf, p_ccb); 571 572#if BT_TRACE_VERBOSE == TRUE 573 if ((((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 1) 574 || (((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 3)) 575 { 576 L2CAP_TRACE_WARNING ("L2CAP eRTM Tx S-frame CID: 0x%04x ctrlword: 0x%04x Type: %s ReqSeq: %u P: %u F: %u", 577 p_ccb->local_cid, ctrl_word, 578 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT], 579 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, 580 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT, 581 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); 582 L2CAP_TRACE_WARNING (" Buf Len: %u", p_buf->len); 583 } 584 else 585 { 586 L2CAP_TRACE_EVENT ("L2CAP eRTM Tx S-frame CID: 0x%04x ctrlword: 0x%04x Type: %s ReqSeq: %u P: %u F: %u", 587 p_ccb->local_cid, ctrl_word, 588 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT], 589 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, 590 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT, 591 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); 592 L2CAP_TRACE_EVENT (" Buf Len: %u", p_buf->len); 593 } 594#endif /* BT_TRACE_VERBOSE */ 595 596 l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, p_buf); 597 598 p_ccb->fcrb.last_ack_sent = p_ccb->fcrb.next_seq_expected; 599 600 if (p_ccb->fcrb.ack_timer.in_use) 601 btu_stop_quick_timer (&p_ccb->fcrb.ack_timer); 602 } 603 else 604 { 605 L2CAP_TRACE_ERROR ("l2c_fcr_send_S_frame(No Resources) cid 0x%04x, Type: 0x%4x", 606 p_ccb->local_cid, function_code); 607 } 608} 609 610 611/******************************************************************************* 612** 613** Function l2c_fcr_proc_pdu 614** 615** Description This function is the entry point for processing of a 616** received PDU when in flow control and/or retransmission modes. 617** 618** Returns - 619** 620*******************************************************************************/ 621void l2c_fcr_proc_pdu (tL2C_CCB *p_ccb, BT_HDR *p_buf) 622{ 623 assert(p_ccb != NULL); 624 assert(p_buf != NULL); 625 UINT8 *p; 626 UINT16 fcs; 627 UINT16 min_pdu_len; 628 UINT16 ctrl_word; 629 630 /* Check the length */ 631 min_pdu_len = (p_ccb->bypass_fcs == L2CAP_BYPASS_FCS) ? 632 (UINT16)L2CAP_FCR_OVERHEAD : (UINT16)(L2CAP_FCS_LEN + L2CAP_FCR_OVERHEAD); 633 634 if (p_buf->len < min_pdu_len) 635 { 636 L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x Len too short: %u", p_ccb->local_cid, p_buf->len); 637 GKI_freebuf (p_buf); 638 return; 639 } 640 641 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_STREAM_MODE) 642 { 643 process_stream_frame (p_ccb, p_buf); 644 return; 645 } 646 647#if BT_TRACE_VERBOSE == TRUE 648 /* Get the control word */ 649 p = ((UINT8 *)(p_buf+1)) + p_buf->offset; 650 STREAM_TO_UINT16 (ctrl_word, p); 651 652 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) 653 { 654 if ((((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 1) 655 || (((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 3)) 656 { 657 /* REJ or SREJ */ 658 L2CAP_TRACE_WARNING ("L2CAP eRTM Rx S-frame: cid: 0x%04x Len: %u Type: %s ReqSeq: %u P: %u F: %u", 659 p_ccb->local_cid, p_buf->len, 660 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT], 661 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, 662 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT, 663 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); 664 } 665 else 666 { 667 L2CAP_TRACE_EVENT ("L2CAP eRTM Rx S-frame: cid: 0x%04x Len: %u Type: %s ReqSeq: %u P: %u F: %u", 668 p_ccb->local_cid, p_buf->len, 669 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT], 670 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, 671 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT, 672 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); 673 } 674 } 675 else 676 { 677 L2CAP_TRACE_EVENT ("L2CAP eRTM Rx I-frame: cid: 0x%04x Len: %u SAR: %-12s TxSeq: %u ReqSeq: %u F: %u", 678 p_ccb->local_cid, p_buf->len, 679 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT], 680 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT, 681 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, 682 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); 683 } 684 685 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", 686 p_ccb->fcrb.next_tx_seq, p_ccb->fcrb.last_rx_ack, p_ccb->fcrb.next_seq_expected, 687 p_ccb->fcrb.last_ack_sent, GKI_queue_length(&p_ccb->fcrb.waiting_for_ack_q), p_ccb->fcrb.num_tries); 688 689#endif /* BT_TRACE_VERBOSE */ 690 691 /* Verify FCS if using */ 692 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) 693 { 694 p = ((UINT8 *)(p_buf+1)) + p_buf->offset + p_buf->len - L2CAP_FCS_LEN; 695 696 /* Extract and drop the FCS from the packet */ 697 STREAM_TO_UINT16 (fcs, p); 698 p_buf->len -= L2CAP_FCS_LEN; 699 700 if (l2c_fcr_rx_get_fcs(p_buf) != fcs) 701 { 702 L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x BAD FCS", p_ccb->local_cid); 703 GKI_freebuf(p_buf); 704 return; 705 } 706 } 707 708 /* Get the control word */ 709 p = ((UINT8 *)(p_buf+1)) + p_buf->offset; 710 711 STREAM_TO_UINT16 (ctrl_word, p); 712 713 p_buf->len -= L2CAP_FCR_OVERHEAD; 714 p_buf->offset += L2CAP_FCR_OVERHEAD; 715 716 /* If we had a poll bit outstanding, check if we got a final response */ 717 if (p_ccb->fcrb.wait_ack) 718 { 719 /* If final bit not set, ignore the frame unless it is a polled S-frame */ 720 if ( !(ctrl_word & L2CAP_FCR_F_BIT) ) 721 { 722 if ( (ctrl_word & L2CAP_FCR_P_BIT) && (ctrl_word & L2CAP_FCR_S_FRAME_BIT) ) 723 { 724 if (p_ccb->fcrb.srej_sent) 725 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_SREJ, L2CAP_FCR_F_BIT); 726 else if (p_ccb->fcrb.local_busy) 727 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_F_BIT); 728 else 729 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_F_BIT); 730 731 /* Got a poll while in wait_ack state, so re-start our timer with 1-second */ 732 /* This is a small optimization... the monitor timer is 12 secs, but we saw */ 733 /* that if the other side sends us a poll when we are waiting for a final, */ 734 /* then it speeds up recovery significantly if we poll him back soon after his poll. */ 735 btu_start_quick_timer (&p_ccb->fcrb.mon_retrans_timer, BTU_TTYPE_L2CAP_CHNL, QUICK_TIMER_TICKS_PER_SEC); 736 } 737 GKI_freebuf (p_buf); 738 return; 739 } 740 741 p_ccb->fcrb.wait_ack = FALSE; 742 743 /* P and F are mutually exclusive */ 744 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) 745 ctrl_word &= ~L2CAP_FCR_P_BIT; 746 747 if (GKI_queue_is_empty(&p_ccb->fcrb.waiting_for_ack_q)) 748 p_ccb->fcrb.num_tries = 0; 749 750 l2c_fcr_stop_timer (p_ccb); 751 } 752 else 753 { 754 /* Otherwise, ensure the final bit is ignored */ 755 ctrl_word &= ~L2CAP_FCR_F_BIT; 756 } 757 758 /* Process receive sequence number */ 759 if (!process_reqseq (p_ccb, ctrl_word)) 760 { 761 GKI_freebuf (p_buf); 762 return; 763 } 764 765 /* Process based on whether it is an S-frame or an I-frame */ 766 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) 767 process_s_frame (p_ccb, p_buf, ctrl_word); 768 else 769 process_i_frame (p_ccb, p_buf, ctrl_word, FALSE); 770 771 /* Return if the channel got disconnected by a bad packet or max retransmissions */ 772 if ( (!p_ccb->in_use) || (p_ccb->chnl_state != CST_OPEN) ) 773 return; 774 775 /* If we have some buffers held while doing SREJ, and SREJ has cleared, process them now */ 776 if ( (!p_ccb->fcrb.local_busy) && (!p_ccb->fcrb.srej_sent) && (!GKI_queue_is_empty(&p_ccb->fcrb.srej_rcv_hold_q))) 777 { 778 BUFFER_Q temp_q = p_ccb->fcrb.srej_rcv_hold_q; 779 780 GKI_init_q (&p_ccb->fcrb.srej_rcv_hold_q); 781 782 while ((p_buf = (BT_HDR *)GKI_dequeue (&temp_q)) != NULL) 783 { 784 if (p_ccb->in_use && (p_ccb->chnl_state == CST_OPEN)) 785 { 786 /* Get the control word */ 787 p = ((UINT8 *)(p_buf+1)) + p_buf->offset - L2CAP_FCR_OVERHEAD; 788 789 STREAM_TO_UINT16 (ctrl_word, p); 790 791 L2CAP_TRACE_DEBUG ("l2c_fcr_proc_pdu() CID: 0x%04x Process Buffer from SREJ_Hold_Q TxSeq: %u Expected_Seq: %u", 792 p_ccb->local_cid, (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT, 793 p_ccb->fcrb.next_seq_expected); 794 795 /* Process the SREJ held I-frame, but do not send an RR for each individual frame */ 796 process_i_frame (p_ccb, p_buf, ctrl_word, TRUE); 797 } 798 else 799 GKI_freebuf (p_buf); 800 801 /* If more frames were lost during SREJ, send a REJ */ 802 if (p_ccb->fcrb.rej_after_srej) 803 { 804 p_ccb->fcrb.rej_after_srej = FALSE; 805 p_ccb->fcrb.rej_sent = TRUE; 806 807 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_REJ, 0); 808 } 809 } 810 811 /* Now, if needed, send one RR for the whole held queue */ 812 if ( (!p_ccb->fcrb.local_busy) && (!p_ccb->fcrb.rej_sent) && (!p_ccb->fcrb.srej_sent) 813 && (p_ccb->fcrb.next_seq_expected != p_ccb->fcrb.last_ack_sent) ) 814 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, 0); 815 else 816 { 817 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", 818 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, 819 p_ccb->fcrb.last_ack_sent); 820 } 821 } 822 823 /* If a window has opened, check if we can send any more packets */ 824 if ( (!GKI_queue_is_empty(&p_ccb->fcrb.retrans_q) || !GKI_queue_is_empty(&p_ccb->xmit_hold_q)) 825 && (p_ccb->fcrb.wait_ack == FALSE) 826 && (l2c_fcr_is_flow_controlled (p_ccb) == FALSE) ) 827 { 828 l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, NULL); 829 } 830} 831 832/******************************************************************************* 833** 834** Function l2c_fcr_proc_tout 835** 836** Description Handle a timeout. We should be in error recovery state. 837** 838** Returns - 839** 840*******************************************************************************/ 841void l2c_fcr_proc_tout (tL2C_CCB *p_ccb) 842{ 843 assert(p_ccb != NULL); 844 L2CAP_TRACE_DEBUG ("l2c_fcr_proc_tout: CID: 0x%04x num_tries: %u (max: %u) wait_ack: %u ack_q_count: %u", 845 p_ccb->local_cid, p_ccb->fcrb.num_tries, p_ccb->peer_cfg.fcr.max_transmit, 846 p_ccb->fcrb.wait_ack, GKI_queue_length(&p_ccb->fcrb.waiting_for_ack_q)); 847 848#if (L2CAP_ERTM_STATS == TRUE) 849 p_ccb->fcrb.retrans_touts++; 850#endif 851 852 if ( (p_ccb->peer_cfg.fcr.max_transmit != 0) && (++p_ccb->fcrb.num_tries > p_ccb->peer_cfg.fcr.max_transmit) ) 853 { 854 l2cu_disconnect_chnl (p_ccb); 855 } 856 else 857 { 858 if (!p_ccb->fcrb.srej_sent && !p_ccb->fcrb.rej_sent) 859 { 860 if (p_ccb->fcrb.local_busy) 861 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_P_BIT); 862 else 863 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_P_BIT); 864 } 865 } 866} 867 868 869/******************************************************************************* 870** 871** Function l2c_fcr_proc_ack_tout 872** 873** Description Send RR/RNR if we have not acked I frame 874** 875** Returns - 876** 877*******************************************************************************/ 878void l2c_fcr_proc_ack_tout (tL2C_CCB *p_ccb) 879{ 880 assert(p_ccb != NULL); 881 L2CAP_TRACE_DEBUG ("l2c_fcr_proc_ack_tout: CID: 0x%04x State: %u Wack:%u Rq:%d Acked:%d", p_ccb->local_cid, 882 p_ccb->chnl_state, p_ccb->fcrb.wait_ack, p_ccb->fcrb.next_seq_expected, p_ccb->fcrb.last_ack_sent); 883 884 if ( (p_ccb->chnl_state == CST_OPEN) && (!p_ccb->fcrb.wait_ack) 885 && (p_ccb->fcrb.last_ack_sent != p_ccb->fcrb.next_seq_expected) ) 886 { 887#if (L2CAP_ERTM_STATS == TRUE) 888 p_ccb->fcrb.xmit_ack_touts++; 889#endif 890 if (p_ccb->fcrb.local_busy) 891 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, 0); 892 else 893 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, 0); 894 } 895} 896 897 898/******************************************************************************* 899** 900** Function process_reqseq 901** 902** Description Handle receive sequence number 903** 904** Returns - 905** 906*******************************************************************************/ 907static BOOLEAN process_reqseq (tL2C_CCB *p_ccb, UINT16 ctrl_word) 908{ 909 assert(p_ccb != NULL); 910 tL2C_FCRB *p_fcrb = &p_ccb->fcrb; 911 UINT8 req_seq, num_bufs_acked, xx; 912 UINT16 ls; 913 UINT16 full_sdus_xmitted; 914 915 /* Receive sequence number does not ack anything for SREJ with P-bit set to zero */ 916 if ( (ctrl_word & L2CAP_FCR_S_FRAME_BIT) 917 && ((ctrl_word & L2CAP_FCR_SUP_BITS) == (L2CAP_FCR_SUP_SREJ << L2CAP_FCR_SUP_SHIFT)) 918 && ((ctrl_word & L2CAP_FCR_P_BIT) == 0) ) 919 { 920 /* If anything still waiting for ack, restart the timer if it was stopped */ 921 if (!GKI_queue_is_empty(&p_fcrb->waiting_for_ack_q)) 922 l2c_fcr_start_timer (p_ccb); 923 924 return (TRUE); 925 } 926 927 /* Extract the receive sequence number from the control word */ 928 req_seq = (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT; 929 930 num_bufs_acked = (req_seq - p_fcrb->last_rx_ack) & L2CAP_FCR_SEQ_MODULO; 931 932 /* Verify the request sequence is in range before proceeding */ 933 if (num_bufs_acked > GKI_queue_length(&p_fcrb->waiting_for_ack_q)) 934 { 935 /* The channel is closed if ReqSeq is not in range */ 936 L2CAP_TRACE_WARNING ("L2CAP eRTM Frame BAD Req_Seq - ctrl_word: 0x%04x req_seq 0x%02x last_rx_ack: 0x%02x QCount: %u", 937 ctrl_word, req_seq, p_fcrb->last_rx_ack, GKI_queue_length(&p_fcrb->waiting_for_ack_q)); 938 939 l2cu_disconnect_chnl (p_ccb); 940 return (FALSE); 941 } 942 943 p_fcrb->last_rx_ack = req_seq; 944 945 /* Now we can release all acknowledged frames, and restart the retransmission timer if needed */ 946 if (num_bufs_acked != 0) 947 { 948 p_fcrb->num_tries = 0; 949 full_sdus_xmitted = 0; 950 951#if (L2CAP_ERTM_STATS == TRUE) 952 l2c_fcr_collect_ack_delay (p_ccb, num_bufs_acked); 953#endif 954 955 for (xx = 0; xx < num_bufs_acked; xx++) 956 { 957 ls = ((BT_HDR *)(GKI_getfirst(&p_fcrb->waiting_for_ack_q)))->layer_specific & L2CAP_FCR_SAR_BITS; 958 959 if ( (ls == L2CAP_FCR_UNSEG_SDU) || (ls == L2CAP_FCR_END_SDU) ) 960 full_sdus_xmitted++; 961 962 GKI_freebuf (GKI_dequeue (&p_fcrb->waiting_for_ack_q)); 963 } 964 965 /* If we are still in a wait_ack state, do not mess with the timer */ 966 if (!p_ccb->fcrb.wait_ack) 967 l2c_fcr_stop_timer (p_ccb); 968 969 /* Check if we need to call the "packet_sent" callback */ 970 if ( (p_ccb->p_rcb) && (p_ccb->p_rcb->api.pL2CA_TxComplete_Cb) && (full_sdus_xmitted) ) 971 { 972 /* Special case for eRTM, if all packets sent, send 0xFFFF */ 973 if (GKI_queue_is_empty(&p_fcrb->waiting_for_ack_q) && (GKI_queue_is_empty(&p_ccb->xmit_hold_q))) 974 full_sdus_xmitted = 0xFFFF; 975 976 (*p_ccb->p_rcb->api.pL2CA_TxComplete_Cb)(p_ccb->local_cid, full_sdus_xmitted); 977 } 978 } 979 980 /* If anything still waiting for ack, restart the timer if it was stopped */ 981 if (!GKI_queue_is_empty(&p_fcrb->waiting_for_ack_q)) 982 l2c_fcr_start_timer (p_ccb); 983 984 return (TRUE); 985} 986 987 988/******************************************************************************* 989** 990** Function process_s_frame 991** 992** Description Process an S frame 993** 994** Returns - 995** 996*******************************************************************************/ 997static void process_s_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word) 998{ 999 assert(p_ccb != NULL); 1000 assert(p_buf != NULL); 1001 1002 tL2C_FCRB *p_fcrb = &p_ccb->fcrb; 1003 UINT16 s_frame_type = (ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT; 1004 BOOLEAN remote_was_busy; 1005 BOOLEAN all_ok = TRUE; 1006 1007 if (p_buf->len != 0) 1008 { 1009 L2CAP_TRACE_WARNING ("Incorrect S-frame Length (%d)", p_buf->len); 1010 } 1011 1012 L2CAP_TRACE_DEBUG ("process_s_frame ctrl_word 0x%04x fcrb_remote_busy:%d", ctrl_word, p_fcrb->remote_busy); 1013 1014#if (L2CAP_ERTM_STATS == TRUE) 1015 p_ccb->fcrb.s_frames_rcvd[s_frame_type]++; 1016#endif 1017 1018 if (ctrl_word & L2CAP_FCR_P_BIT) 1019 { 1020 p_fcrb->rej_sent = FALSE; /* After checkpoint, we can send anoher REJ */ 1021 p_fcrb->send_f_rsp = TRUE; /* Set a flag in case an I-frame is pending */ 1022 } 1023 1024 switch (s_frame_type) 1025 { 1026 case L2CAP_FCR_SUP_RR: 1027 remote_was_busy = p_fcrb->remote_busy; 1028 p_fcrb->remote_busy = FALSE; 1029 1030 if ( (ctrl_word & L2CAP_FCR_F_BIT) || (remote_was_busy) ) 1031 all_ok = retransmit_i_frames (p_ccb, L2C_FCR_RETX_ALL_PKTS); 1032 break; 1033 1034 case L2CAP_FCR_SUP_REJ: 1035 p_fcrb->remote_busy = FALSE; 1036 all_ok = retransmit_i_frames (p_ccb, L2C_FCR_RETX_ALL_PKTS); 1037 break; 1038 1039 case L2CAP_FCR_SUP_RNR: 1040 p_fcrb->remote_busy = TRUE; 1041 l2c_fcr_stop_timer (p_ccb); 1042 break; 1043 1044 case L2CAP_FCR_SUP_SREJ: 1045 p_fcrb->remote_busy = FALSE; 1046 all_ok = retransmit_i_frames (p_ccb, (UINT8)((ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT)); 1047 break; 1048 } 1049 1050 if (all_ok) 1051 { 1052 /* If polled, we need to respond with F-bit. Note, we may have sent a I-frame with the F-bit */ 1053 if (p_fcrb->send_f_rsp) 1054 { 1055 if (p_fcrb->srej_sent) 1056 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_SREJ, L2CAP_FCR_F_BIT); 1057 else if (p_fcrb->local_busy) 1058 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_F_BIT); 1059 else 1060 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_F_BIT); 1061 1062 p_fcrb->send_f_rsp = FALSE; 1063 } 1064 } 1065 else 1066 { 1067 L2CAP_TRACE_DEBUG ("process_s_frame hit_max_retries"); 1068 } 1069 1070 GKI_freebuf (p_buf); 1071} 1072 1073 1074/******************************************************************************* 1075** 1076** Function process_i_frame 1077** 1078** Description Process an I frame 1079** 1080** Returns - 1081** 1082*******************************************************************************/ 1083static void process_i_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word, BOOLEAN delay_ack) 1084{ 1085 assert(p_ccb != NULL); 1086 assert(p_buf != NULL); 1087 1088 tL2C_FCRB *p_fcrb = &p_ccb->fcrb; 1089 UINT8 tx_seq, num_lost, num_to_ack, next_srej; 1090 1091 /* If we were doing checkpoint recovery, first retransmit all unacked I-frames */ 1092 if (ctrl_word & L2CAP_FCR_F_BIT) 1093 { 1094 if (!retransmit_i_frames (p_ccb, L2C_FCR_RETX_ALL_PKTS)) 1095 { 1096 GKI_freebuf(p_buf); 1097 return; 1098 } 1099 } 1100 1101#if (L2CAP_ERTM_STATS == TRUE) 1102 p_ccb->fcrb.ertm_pkt_counts[1]++; 1103 p_ccb->fcrb.ertm_byte_counts[1] += p_buf->len; 1104#endif 1105 1106 /* Extract the sequence number */ 1107 tx_seq = (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT; 1108 1109 /* If we have flow controlled the peer, ignore any bad I-frames from him */ 1110 if ( (tx_seq != p_fcrb->next_seq_expected) && (p_fcrb->local_busy) ) 1111 { 1112 L2CAP_TRACE_WARNING ("Dropping bad I-Frame since we flowed off, tx_seq:%u", tx_seq); 1113 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, 0); 1114 GKI_freebuf(p_buf); 1115 return; 1116 } 1117 1118 /* If there are no free buffers in the user Rx queue, drop the */ 1119 /* received buffer now before we update any sequence numbers */ 1120 if (GKI_poolfreecount (p_ccb->ertm_info.user_rx_pool_id) == 0) 1121 { 1122 L2CAP_TRACE_WARNING ("L2CAP CID: 0x%04x Dropping I-Frame seq: %u User RX Pool: %u (Size: %u) has no free buffers!!", 1123 p_ccb->local_cid, tx_seq, p_ccb->ertm_info.user_rx_pool_id, 1124 GKI_poolcount (p_ccb->ertm_info.user_rx_pool_id)); 1125 GKI_freebuf(p_buf); 1126 return; 1127 } 1128 1129 /* Check if tx-sequence is the expected one */ 1130 if (tx_seq != p_fcrb->next_seq_expected) 1131 { 1132 num_lost = (tx_seq - p_fcrb->next_seq_expected) & L2CAP_FCR_SEQ_MODULO; 1133 1134 /* Is the frame a duplicate ? If so, just drop it */ 1135 if (num_lost >= p_ccb->our_cfg.fcr.tx_win_sz) 1136 { 1137 /* Duplicate - simply drop it */ 1138 L2CAP_TRACE_WARNING ("process_i_frame() Dropping Duplicate Frame tx_seq:%u ExpectedTxSeq %u", tx_seq, p_fcrb->next_seq_expected); 1139 GKI_freebuf(p_buf); 1140 } 1141 else 1142 { 1143 L2CAP_TRACE_WARNING ("process_i_frame() CID: 0x%04x Lost: %u tx_seq:%u ExpTxSeq %u Rej: %u SRej: %u", 1144 p_ccb->local_cid, num_lost, tx_seq, p_fcrb->next_seq_expected, p_fcrb->rej_sent, p_fcrb->srej_sent); 1145 1146 if (p_fcrb->srej_sent) 1147 { 1148 /* If SREJ sent, save the frame for later processing as long as it is in sequence */ 1149 next_srej = (((BT_HDR *)GKI_getlast(&p_fcrb->srej_rcv_hold_q))->layer_specific + 1) & L2CAP_FCR_SEQ_MODULO; 1150 1151 if ( (tx_seq == next_srej) && (GKI_queue_length(&p_fcrb->srej_rcv_hold_q) < p_ccb->our_cfg.fcr.tx_win_sz) ) 1152 { 1153 /* If user gave us a pool for held rx buffers, use that */ 1154 if (p_ccb->ertm_info.fcr_rx_pool_id != HCI_ACL_POOL_ID) 1155 { 1156 BT_HDR *p_buf2; 1157 1158 /* Adjust offset and len so that control word is copied */ 1159 p_buf->offset -= L2CAP_FCR_OVERHEAD; 1160 p_buf->len += L2CAP_FCR_OVERHEAD; 1161 1162 p_buf2 = l2c_fcr_clone_buf (p_buf, p_buf->offset, p_buf->len, p_ccb->ertm_info.fcr_rx_pool_id); 1163 1164 if (p_buf2) 1165 { 1166 GKI_freebuf (p_buf); 1167 p_buf = p_buf2; 1168 } 1169 p_buf->offset += L2CAP_FCR_OVERHEAD; 1170 p_buf->len -= L2CAP_FCR_OVERHEAD; 1171 } 1172 L2CAP_TRACE_DEBUG ("process_i_frame() Lost: %u tx_seq:%u ExpTxSeq %u Rej: %u SRej1", 1173 num_lost, tx_seq, p_fcrb->next_seq_expected, p_fcrb->rej_sent); 1174 1175 p_buf->layer_specific = tx_seq; 1176 GKI_enqueue (&p_fcrb->srej_rcv_hold_q, p_buf); 1177 } 1178 else 1179 { 1180 L2CAP_TRACE_WARNING ("process_i_frame() CID: 0x%04x frame dropped in Srej Sent next_srej:%u hold_q.count:%u win_sz:%u", 1181 p_ccb->local_cid, next_srej, GKI_queue_length(&p_fcrb->srej_rcv_hold_q), p_ccb->our_cfg.fcr.tx_win_sz); 1182 1183 p_fcrb->rej_after_srej = TRUE; 1184 GKI_freebuf (p_buf); 1185 } 1186 } 1187 else if (p_fcrb->rej_sent) 1188 { 1189 L2CAP_TRACE_WARNING ("process_i_frame() CID: 0x%04x Lost: %u tx_seq:%u ExpTxSeq %u Rej: 1 SRej: %u", 1190 p_ccb->local_cid, num_lost, tx_seq, p_fcrb->next_seq_expected, p_fcrb->srej_sent); 1191 1192 /* If REJ sent, just drop the frame */ 1193 GKI_freebuf (p_buf); 1194 } 1195 else 1196 { 1197 L2CAP_TRACE_DEBUG ("process_i_frame() CID: 0x%04x tx_seq:%u ExpTxSeq %u Rej: %u", 1198 p_ccb->local_cid, tx_seq, p_fcrb->next_seq_expected, p_fcrb->rej_sent); 1199 1200 /* If only one lost, we will send SREJ, otherwise we will send REJ */ 1201 if (num_lost > 1) 1202 { 1203 GKI_freebuf (p_buf); 1204 p_fcrb->rej_sent = TRUE; 1205 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_REJ, 0); 1206 } 1207 else 1208 { 1209 if (!GKI_queue_is_empty(&p_fcrb->srej_rcv_hold_q)) 1210 { 1211 L2CAP_TRACE_ERROR ("process_i_frame() CID: 0x%04x sending SREJ tx_seq:%d hold_q.count:%u", 1212 p_ccb->local_cid, tx_seq, GKI_queue_length(&p_fcrb->srej_rcv_hold_q)); 1213 } 1214 p_buf->layer_specific = tx_seq; 1215 GKI_enqueue (&p_fcrb->srej_rcv_hold_q, p_buf); 1216 p_fcrb->srej_sent = TRUE; 1217 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_SREJ, 0); 1218 } 1219 btu_stop_quick_timer (&p_ccb->fcrb.ack_timer); 1220 } 1221 } 1222 return; 1223 } 1224 1225 /* Seq number is the next expected. Clear possible reject exception in case it occured */ 1226 p_fcrb->rej_sent = p_fcrb->srej_sent = FALSE; 1227 1228 /* Adjust the next_seq, so that if the upper layer sends more data in the callback 1229 context, the received frame is acked by an I-frame. */ 1230 p_fcrb->next_seq_expected = (tx_seq + 1) & L2CAP_FCR_SEQ_MODULO; 1231 1232 /* If any SAR problem in eRTM mode, spec says disconnect. */ 1233 if (!do_sar_reassembly (p_ccb, p_buf, ctrl_word)) 1234 { 1235 L2CAP_TRACE_WARNING ("process_i_frame() CID: 0x%04x reassembly failed", p_ccb->local_cid); 1236 l2cu_disconnect_chnl (p_ccb); 1237 return; 1238 } 1239 1240 /* RR optimization - if peer can still send us more, then start an ACK timer */ 1241 num_to_ack = (p_fcrb->next_seq_expected - p_fcrb->last_ack_sent) & L2CAP_FCR_SEQ_MODULO; 1242 1243 if ( (num_to_ack < p_ccb->fcrb.max_held_acks) && (!p_fcrb->local_busy) ) 1244 delay_ack = TRUE; 1245 1246 /* We should neve never ack frame if we are not in OPEN state */ 1247 if ((num_to_ack != 0) && p_ccb->in_use && (p_ccb->chnl_state == CST_OPEN)) 1248 { 1249 /* If no frames are awaiting transmission or are held, send an RR or RNR S-frame for ack */ 1250 if (delay_ack) 1251 { 1252 /* If it is the first I frame we did not ack, start ack timer */ 1253 if (!p_ccb->fcrb.ack_timer.in_use) 1254 { 1255 btu_start_quick_timer (&p_ccb->fcrb.ack_timer, BTU_TTYPE_L2CAP_FCR_ACK, 1256 (L2CAP_FCR_ACK_TOUT*QUICK_TIMER_TICKS_PER_SEC)/1000); 1257 } 1258 } 1259 else if ( ((GKI_queue_is_empty(&p_ccb->xmit_hold_q)) || (l2c_fcr_is_flow_controlled (p_ccb))) 1260 && (GKI_queue_is_empty(&p_ccb->fcrb.srej_rcv_hold_q))) 1261 { 1262 if (p_fcrb->local_busy) 1263 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, 0); 1264 else 1265 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, 0); 1266 } 1267 } 1268} 1269 1270 1271/******************************************************************************* 1272** 1273** Function process_stream_frame 1274** 1275** Description This function processes frames in streaming mode 1276** 1277** Returns - 1278** 1279*******************************************************************************/ 1280static void process_stream_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf) 1281{ 1282 assert(p_ccb != NULL); 1283 assert(p_buf != NULL); 1284 1285 UINT16 ctrl_word; 1286 UINT16 fcs; 1287 UINT8 *p; 1288 UINT8 tx_seq; 1289 1290 /* Verify FCS if using */ 1291 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) 1292 { 1293 p = ((UINT8 *)(p_buf+1)) + p_buf->offset + p_buf->len - L2CAP_FCS_LEN; 1294 1295 /* Extract and drop the FCS from the packet */ 1296 STREAM_TO_UINT16 (fcs, p); 1297 p_buf->len -= L2CAP_FCS_LEN; 1298 1299 if (l2c_fcr_rx_get_fcs(p_buf) != fcs) 1300 { 1301 L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x BAD FCS", p_ccb->local_cid); 1302 GKI_freebuf(p_buf); 1303 return; 1304 } 1305 } 1306 1307 /* Get the control word */ 1308 p = ((UINT8 *)(p_buf+1)) + p_buf->offset; 1309 1310 STREAM_TO_UINT16 (ctrl_word, p); 1311 1312 p_buf->len -= L2CAP_FCR_OVERHEAD; 1313 p_buf->offset += L2CAP_FCR_OVERHEAD; 1314 1315 /* Make sure it is an I-frame */ 1316 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) 1317 { 1318 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); 1319 GKI_freebuf (p_buf); 1320 return; 1321 } 1322 1323#if BT_TRACE_VERBOSE == TRUE 1324 L2CAP_TRACE_EVENT ("L2CAP eRTM Rx I-frame: cid: 0x%04x Len: %u SAR: %-12s TxSeq: %u ReqSeq: %u F: %u", 1325 p_ccb->local_cid, p_buf->len, 1326 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT], 1327 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT, 1328 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, 1329 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); 1330#endif 1331 1332 /* Extract the sequence number */ 1333 tx_seq = (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT; 1334 1335 /* Check if tx-sequence is the expected one */ 1336 if (tx_seq != p_ccb->fcrb.next_seq_expected) 1337 { 1338 L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x Lost frames Exp: %u Got: %u p_rx_sdu: 0x%08x", 1339 p_ccb->local_cid, p_ccb->fcrb.next_seq_expected, tx_seq, p_ccb->fcrb.p_rx_sdu); 1340 1341 /* Lost one or more packets, so flush the SAR queue */ 1342 if (p_ccb->fcrb.p_rx_sdu != NULL) 1343 { 1344 GKI_freebuf (p_ccb->fcrb.p_rx_sdu); 1345 p_ccb->fcrb.p_rx_sdu = NULL; 1346 } 1347 } 1348 1349 p_ccb->fcrb.next_seq_expected = (tx_seq + 1) & L2CAP_FCR_SEQ_MODULO; 1350 1351 if (!do_sar_reassembly (p_ccb, p_buf, ctrl_word)) 1352 { 1353 /* Some sort of SAR error, so flush the SAR queue */ 1354 if (p_ccb->fcrb.p_rx_sdu != NULL) 1355 { 1356 GKI_freebuf (p_ccb->fcrb.p_rx_sdu); 1357 p_ccb->fcrb.p_rx_sdu = NULL; 1358 } 1359 } 1360} 1361 1362 1363/******************************************************************************* 1364** 1365** Function do_sar_reassembly 1366** 1367** Description Process SAR bits and re-assemble frame 1368** 1369** Returns TRUE if all OK, else FALSE 1370** 1371*******************************************************************************/ 1372static BOOLEAN do_sar_reassembly (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word) 1373{ 1374 assert(p_ccb != NULL); 1375 assert(p_buf != NULL); 1376 1377 tL2C_FCRB *p_fcrb = &p_ccb->fcrb; 1378 UINT16 sar_type = ctrl_word & L2CAP_FCR_SEG_BITS; 1379 BOOLEAN packet_ok = TRUE; 1380 UINT8 *p; 1381 1382 /* Check if the SAR state is correct */ 1383 if ((sar_type == L2CAP_FCR_UNSEG_SDU) || (sar_type == L2CAP_FCR_START_SDU)) 1384 { 1385 if (p_fcrb->p_rx_sdu != NULL) 1386 { 1387 L2CAP_TRACE_WARNING ("SAR - got unexpected unsegmented or start SDU Expected len: %u Got so far: %u", 1388 p_fcrb->rx_sdu_len, p_fcrb->p_rx_sdu->len); 1389 1390 packet_ok = FALSE; 1391 } 1392 /* Check the length of the packet */ 1393 if ( (sar_type == L2CAP_FCR_START_SDU) && (p_buf->len < L2CAP_SDU_LEN_OVERHEAD) ) 1394 { 1395 L2CAP_TRACE_WARNING ("SAR start packet too short: %u", p_buf->len); 1396 packet_ok = FALSE; 1397 } 1398 } 1399 else 1400 { 1401 if (p_fcrb->p_rx_sdu == NULL) 1402 { 1403 L2CAP_TRACE_WARNING ("SAR - got unexpected cont or end SDU"); 1404 packet_ok = FALSE; 1405 } 1406 } 1407 1408 if ( (packet_ok) && (sar_type != L2CAP_FCR_UNSEG_SDU) ) 1409 { 1410 p = ((UINT8 *)(p_buf + 1)) + p_buf->offset; 1411 1412 /* For start SDU packet, extract the SDU length */ 1413 if (sar_type == L2CAP_FCR_START_SDU) 1414 { 1415 /* Get the SDU length */ 1416 STREAM_TO_UINT16 (p_fcrb->rx_sdu_len, p); 1417 p_buf->offset += 2; 1418 p_buf->len -= 2; 1419 1420 if (p_fcrb->rx_sdu_len > p_ccb->max_rx_mtu) 1421 { 1422 L2CAP_TRACE_WARNING ("SAR - SDU len: %u larger than MTU: %u", p_fcrb->rx_sdu_len, p_fcrb->rx_sdu_len); 1423 packet_ok = FALSE; 1424 } 1425 else if ((p_fcrb->p_rx_sdu = (BT_HDR *)GKI_getpoolbuf (p_ccb->ertm_info.user_rx_pool_id)) == NULL) 1426 { 1427 L2CAP_TRACE_ERROR ("SAR - no buffer for SDU start user_rx_pool_id:%d", p_ccb->ertm_info.user_rx_pool_id); 1428 packet_ok = FALSE; 1429 } 1430 else 1431 { 1432 p_fcrb->p_rx_sdu->offset = 4; /* this is the minimal offset required by OBX to process incoming packets */ 1433 p_fcrb->p_rx_sdu->len = 0; 1434 } 1435 } 1436 1437 if (packet_ok) 1438 { 1439 if ((p_fcrb->p_rx_sdu->len + p_buf->len) > p_fcrb->rx_sdu_len) 1440 { 1441 L2CAP_TRACE_ERROR ("SAR - SDU len exceeded Type: %u Lengths: %u %u %u", 1442 sar_type, p_fcrb->p_rx_sdu->len, p_buf->len, p_fcrb->rx_sdu_len); 1443 packet_ok = FALSE; 1444 } 1445 else if ( (sar_type == L2CAP_FCR_END_SDU) && ((p_fcrb->p_rx_sdu->len + p_buf->len) != p_fcrb->rx_sdu_len) ) 1446 { 1447 L2CAP_TRACE_WARNING ("SAR - SDU end rcvd but SDU incomplete: %u %u %u", 1448 p_fcrb->p_rx_sdu->len, p_buf->len, p_fcrb->rx_sdu_len); 1449 packet_ok = FALSE; 1450 } 1451 else 1452 { 1453 memcpy (((UINT8 *) (p_fcrb->p_rx_sdu + 1)) + p_fcrb->p_rx_sdu->offset + p_fcrb->p_rx_sdu->len, p, p_buf->len); 1454 1455 p_fcrb->p_rx_sdu->len += p_buf->len; 1456 1457 GKI_freebuf (p_buf); 1458 p_buf = NULL; 1459 1460 if (sar_type == L2CAP_FCR_END_SDU) 1461 { 1462 p_buf = p_fcrb->p_rx_sdu; 1463 p_fcrb->p_rx_sdu = NULL; 1464 } 1465 } 1466 } 1467 } 1468 1469 if (packet_ok == FALSE) 1470 { 1471 GKI_freebuf (p_buf); 1472 } 1473 else if (p_buf != NULL) 1474 { 1475#if (L2CAP_NUM_FIXED_CHNLS > 0) 1476 if (p_ccb->local_cid < L2CAP_BASE_APPL_CID && 1477 (p_ccb->local_cid >= L2CAP_FIRST_FIXED_CHNL && p_ccb->local_cid <= L2CAP_LAST_FIXED_CHNL)) 1478 { 1479 if (l2cb.fixed_reg[p_ccb->local_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb) 1480 (*l2cb.fixed_reg[p_ccb->local_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb)(p_ccb->p_lcb->remote_bd_addr, p_buf); 1481 } 1482 else 1483#endif 1484 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DATA, p_buf); 1485 } 1486 1487 return (packet_ok); 1488} 1489 1490 1491/******************************************************************************* 1492** 1493** Function retransmit_i_frames 1494** 1495** Description This function retransmits i-frames awaiting acks. 1496** 1497** Returns BOOLEAN - TRUE if retransmitted 1498** 1499*******************************************************************************/ 1500static BOOLEAN retransmit_i_frames (tL2C_CCB *p_ccb, UINT8 tx_seq) 1501{ 1502 assert(p_ccb != NULL); 1503 1504 BT_HDR *p_buf, *p_buf2; 1505 UINT8 *p; 1506 UINT8 buf_seq; 1507 UINT16 ctrl_word; 1508 1509 if ( (GKI_getfirst(&p_ccb->fcrb.waiting_for_ack_q)) 1510 && (p_ccb->peer_cfg.fcr.max_transmit != 0) 1511 && (p_ccb->fcrb.num_tries >= p_ccb->peer_cfg.fcr.max_transmit) ) 1512 { 1513 L2CAP_TRACE_EVENT ("Max Tries Exceeded: (last_acq: %d CID: 0x%04x num_tries: %u (max: %u) ack_q_count: %u", 1514 p_ccb->fcrb.last_rx_ack, p_ccb->local_cid, p_ccb->fcrb.num_tries, p_ccb->peer_cfg.fcr.max_transmit, 1515 GKI_queue_length(&p_ccb->fcrb.waiting_for_ack_q)); 1516 1517 l2cu_disconnect_chnl (p_ccb); 1518 return (FALSE); 1519 } 1520 1521 /* tx_seq indicates whether to retransmit a specific sequence or all (if == L2C_FCR_RETX_ALL_PKTS) */ 1522 if (tx_seq != L2C_FCR_RETX_ALL_PKTS) 1523 { 1524 /* If sending only one, the sequence number tells us which one. Look for it. 1525 */ 1526 for (p_buf = (BT_HDR *)GKI_getfirst(&p_ccb->fcrb.waiting_for_ack_q); p_buf; p_buf = (BT_HDR *)GKI_getnext (p_buf)) 1527 { 1528 /* Get the old control word */ 1529 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + L2CAP_PKT_OVERHEAD; 1530 1531 STREAM_TO_UINT16 (ctrl_word, p); 1532 1533 buf_seq = (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT; 1534 1535 L2CAP_TRACE_DEBUG ("retransmit_i_frames() cur seq: %u looking for: %u", buf_seq, tx_seq); 1536 1537 if (tx_seq == buf_seq) 1538 break; 1539 } 1540 1541 if (!p_buf) 1542 { 1543 L2CAP_TRACE_ERROR ("retransmit_i_frames() UNKNOWN seq: %u q_count: %u", tx_seq, GKI_queue_length(&p_ccb->fcrb.waiting_for_ack_q)); 1544 return (TRUE); 1545 } 1546 } 1547 else 1548 { 1549 // Iterate though list and flush the amount requested from 1550 // the transmit data queue that satisfy the layer and event conditions. 1551 for (const list_node_t *node = list_begin(p_ccb->p_lcb->link_xmit_data_q); 1552 node != list_end(p_ccb->p_lcb->link_xmit_data_q);) { 1553 BT_HDR *p_buf = (BT_HDR *)list_node(node); 1554 node = list_next(node); 1555 1556 /* Do not flush other CIDs or partial segments */ 1557 if ((p_buf->layer_specific == 0) && (p_buf->event == p_ccb->local_cid)) { 1558 list_remove(p_ccb->p_lcb->link_xmit_data_q, p_buf); 1559 GKI_freebuf(p_buf); 1560 } 1561 } 1562 1563 /* Also flush our retransmission queue */ 1564 while (!GKI_queue_is_empty(&p_ccb->fcrb.retrans_q)) 1565 GKI_freebuf (GKI_dequeue (&p_ccb->fcrb.retrans_q)); 1566 1567 p_buf = (BT_HDR *)GKI_getfirst(&p_ccb->fcrb.waiting_for_ack_q); 1568 } 1569 1570 while (p_buf != NULL) 1571 { 1572 p_buf2 = l2c_fcr_clone_buf (p_buf, p_buf->offset, p_buf->len, p_ccb->ertm_info.fcr_tx_pool_id); 1573 1574 if (p_buf2) 1575 { 1576 p_buf2->layer_specific = p_buf->layer_specific; 1577 1578 GKI_enqueue (&p_ccb->fcrb.retrans_q, p_buf2); 1579 } 1580 1581 if ( (tx_seq != L2C_FCR_RETX_ALL_PKTS) || (p_buf2 == NULL) ) 1582 break; 1583 else 1584 p_buf = (BT_HDR *)GKI_getnext (p_buf); 1585 } 1586 1587 l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, NULL); 1588 1589 if (GKI_queue_length(&p_ccb->fcrb.waiting_for_ack_q)) 1590 { 1591 p_ccb->fcrb.num_tries++; 1592 l2c_fcr_start_timer (p_ccb); 1593 } 1594 1595 return (TRUE); 1596} 1597 1598 1599/******************************************************************************* 1600** 1601** Function l2c_fcr_get_next_xmit_sdu_seg 1602** 1603** Description Get the next SDU segment to transmit. 1604** 1605** Returns pointer to buffer with segment or NULL 1606** 1607*******************************************************************************/ 1608BT_HDR *l2c_fcr_get_next_xmit_sdu_seg (tL2C_CCB *p_ccb, UINT16 max_packet_length) 1609{ 1610 assert(p_ccb != NULL); 1611 1612 BOOLEAN first_seg = FALSE, /* The segment is the first part of data */ 1613 mid_seg = FALSE, /* The segment is the middle part of data */ 1614 last_seg = FALSE; /* The segment is the last part of data */ 1615 UINT16 sdu_len = 0; 1616 BT_HDR *p_buf, *p_xmit; 1617 UINT8 *p; 1618 UINT16 max_pdu = p_ccb->tx_mps /* Needed? - L2CAP_MAX_HEADER_FCS*/; 1619 1620 /* If there is anything in the retransmit queue, that goes first 1621 */ 1622 if (GKI_getfirst(&p_ccb->fcrb.retrans_q)) 1623 { 1624 p_buf = (BT_HDR *)GKI_dequeue (&p_ccb->fcrb.retrans_q); 1625 1626 /* Update Rx Seq and FCS if we acked some packets while this one was queued */ 1627 prepare_I_frame (p_ccb, p_buf, TRUE); 1628 1629 p_buf->event = p_ccb->local_cid; 1630 1631#if (L2CAP_ERTM_STATS == TRUE) 1632 p_ccb->fcrb.pkts_retransmitted++; 1633 p_ccb->fcrb.ertm_pkt_counts[0]++; 1634 p_ccb->fcrb.ertm_byte_counts[0] += (p_buf->len - 8); 1635#endif 1636 return (p_buf); 1637 } 1638 1639 /* For BD/EDR controller, max_packet_length is set to 0 */ 1640 /* For AMP controller, max_packet_length is set by available blocks */ 1641 if ( (max_packet_length > L2CAP_MAX_HEADER_FCS) 1642 && (max_pdu + L2CAP_MAX_HEADER_FCS > max_packet_length) ) 1643 { 1644 max_pdu = max_packet_length - L2CAP_MAX_HEADER_FCS; 1645 } 1646 1647 p_buf = (BT_HDR *)GKI_getfirst(&p_ccb->xmit_hold_q); 1648 1649 /* If there is more data than the MPS, it requires segmentation */ 1650 if (p_buf->len > max_pdu) 1651 { 1652 /* We are using the "event" field to tell is if we already started segmentation */ 1653 if (p_buf->event == 0) 1654 { 1655 first_seg = TRUE; 1656 sdu_len = p_buf->len; 1657 } 1658 else 1659 mid_seg = TRUE; 1660 1661 /* Get a new buffer and copy the data that can be sent in a PDU */ 1662 p_xmit = l2c_fcr_clone_buf (p_buf, L2CAP_MIN_OFFSET + L2CAP_SDU_LEN_OFFSET, 1663 max_pdu, p_ccb->ertm_info.fcr_tx_pool_id); 1664 1665 if (p_xmit != NULL) 1666 { 1667 p_buf->event = p_ccb->local_cid; 1668 p_xmit->event = p_ccb->local_cid; 1669 1670 p_buf->len -= max_pdu; 1671 p_buf->offset += max_pdu; 1672 1673 /* copy PBF setting */ 1674 p_xmit->layer_specific = p_buf->layer_specific; 1675 } 1676 else /* Should never happen if the application has configured buffers correctly */ 1677 { 1678 L2CAP_TRACE_ERROR ("L2CAP - cannot get buffer, for segmentation, pool: %u", p_ccb->ertm_info.fcr_tx_pool_id); 1679 return (NULL); 1680 } 1681 } 1682 else /* Use the original buffer if no segmentation, or the last segment */ 1683 { 1684 p_xmit = (BT_HDR *)GKI_dequeue (&p_ccb->xmit_hold_q); 1685 1686 if (p_xmit->event != 0) 1687 last_seg = TRUE; 1688 1689 p_xmit->event = p_ccb->local_cid; 1690 } 1691 1692 /* Step back to add the L2CAP headers */ 1693 p_xmit->offset -= (L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD); 1694 p_xmit->len += L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD; 1695 1696 if (first_seg) 1697 { 1698 p_xmit->offset -= L2CAP_SDU_LEN_OVERHEAD; 1699 p_xmit->len += L2CAP_SDU_LEN_OVERHEAD; 1700 } 1701 1702 /* Set the pointer to the beginning of the data */ 1703 p = (UINT8 *)(p_xmit + 1) + p_xmit->offset; 1704 1705 /* Now the L2CAP header */ 1706 1707 /* Note: if FCS has to be included then the length is recalculated later */ 1708 UINT16_TO_STREAM (p, p_xmit->len - L2CAP_PKT_OVERHEAD); 1709 1710 UINT16_TO_STREAM (p, p_ccb->remote_cid); 1711 1712 if (first_seg) 1713 { 1714 /* Skip control word and add SDU length */ 1715 p += 2; 1716 UINT16_TO_STREAM (p, sdu_len); 1717 1718 /* We will store the SAR type in layer-specific */ 1719 /* layer_specific is shared with flushable flag(bits 0-1), don't clear it */ 1720 p_xmit->layer_specific |= L2CAP_FCR_START_SDU; 1721 1722 first_seg = FALSE; 1723 } 1724 else if (mid_seg) 1725 p_xmit->layer_specific |= L2CAP_FCR_CONT_SDU; 1726 else if (last_seg) 1727 p_xmit->layer_specific |= L2CAP_FCR_END_SDU; 1728 else 1729 p_xmit->layer_specific |= L2CAP_FCR_UNSEG_SDU; 1730 1731 prepare_I_frame (p_ccb, p_xmit, FALSE); 1732 1733 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) 1734 { 1735 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); 1736 1737 if (!p_wack) 1738 { 1739 L2CAP_TRACE_ERROR ("L2CAP - no buffer for xmit cloning, CID: 0x%04x Pool: %u Count: %u", 1740 p_ccb->local_cid, p_ccb->ertm_info.fcr_tx_pool_id, GKI_poolfreecount(p_ccb->ertm_info.fcr_tx_pool_id)); 1741 1742 /* We will not save the FCS in case we reconfigure and change options */ 1743 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) 1744 p_xmit->len -= L2CAP_FCS_LEN; 1745 1746 /* Pretend we sent it and it got lost */ 1747 GKI_enqueue (&p_ccb->fcrb.waiting_for_ack_q, p_xmit); 1748 return (NULL); 1749 } 1750 else 1751 { 1752#if (L2CAP_ERTM_STATS == TRUE) 1753 /* set timestamp at the end of tx I-frame to get acking delay */ 1754 p = ((UINT8 *) (p_wack+1)) + p_wack->offset + p_wack->len; 1755 UINT32_TO_STREAM (p, GKI_get_os_tick_count()); 1756#endif 1757 /* We will not save the FCS in case we reconfigure and change options */ 1758 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) 1759 p_wack->len -= L2CAP_FCS_LEN; 1760 1761 p_wack->layer_specific = p_xmit->layer_specific; 1762 GKI_enqueue (&p_ccb->fcrb.waiting_for_ack_q, p_wack); 1763 } 1764 1765#if (L2CAP_ERTM_STATS == TRUE) 1766 p_ccb->fcrb.ertm_pkt_counts[0]++; 1767 p_ccb->fcrb.ertm_byte_counts[0] += (p_xmit->len - 8); 1768#endif 1769 1770 } 1771 1772 return (p_xmit); 1773} 1774 1775 1776/******************************************************************************* 1777** Configuration negotiation functions 1778** 1779** The following functions are used in negotiating channel modes during 1780** configuration 1781********************************************************************************/ 1782 1783/******************************************************************************* 1784** 1785** Function l2c_fcr_chk_chan_modes 1786** 1787** Description Validates and adjusts if necessary, the FCR options 1788** based on remote EXT features. 1789** 1790** Note: This assumes peer EXT Features have been received. 1791** Basic mode is used if FCR Options have not been received 1792** 1793** Returns UINT8 - nonzero if can continue, '0' if no compatible channels 1794** 1795*******************************************************************************/ 1796UINT8 l2c_fcr_chk_chan_modes (tL2C_CCB *p_ccb) 1797{ 1798 assert(p_ccb != NULL); 1799 1800 /* Remove nonbasic options that the peer does not support */ 1801 if (!(p_ccb->p_lcb->peer_ext_fea & L2CAP_EXTFEA_ENH_RETRANS)) 1802 p_ccb->ertm_info.allowed_modes &= ~L2CAP_FCR_CHAN_OPT_ERTM; 1803 1804 if (!(p_ccb->p_lcb->peer_ext_fea & L2CAP_EXTFEA_STREAM_MODE)) 1805 p_ccb->ertm_info.allowed_modes &= ~L2CAP_FCR_CHAN_OPT_STREAM; 1806 1807 /* At least one type needs to be set (Basic, ERTM, STM) to continue */ 1808 if (!p_ccb->ertm_info.allowed_modes) 1809 { 1810 L2CAP_TRACE_WARNING ("L2CAP - Peer does not support our desired channel types"); 1811 } 1812 1813 return (p_ccb->ertm_info.allowed_modes); 1814} 1815 1816/******************************************************************************* 1817** 1818** Function l2c_fcr_adj_our_req_options 1819** 1820** Description Validates and sets up the FCR options passed in from 1821** L2CA_ConfigReq based on remote device's features. 1822** 1823** Returns TRUE if no errors, Otherwise FALSE 1824** 1825*******************************************************************************/ 1826BOOLEAN l2c_fcr_adj_our_req_options (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg) 1827{ 1828 assert(p_ccb != NULL); 1829 assert(p_cfg != NULL); 1830 1831 tL2CAP_FCR_OPTS *p_fcr = &p_cfg->fcr; 1832 1833 if (p_fcr->mode != p_ccb->ertm_info.preferred_mode) 1834 { 1835 L2CAP_TRACE_WARNING ("l2c_fcr_adj_our_req_options - preferred_mode (%d), does not match mode (%d)", 1836 p_ccb->ertm_info.preferred_mode, p_fcr->mode); 1837 1838 /* The preferred mode is passed in through tL2CAP_ERTM_INFO, so override this one */ 1839 p_fcr->mode = p_ccb->ertm_info.preferred_mode; 1840 } 1841 1842 /* If upper layer did not request eRTM mode, BASIC must be used */ 1843 if (p_ccb->ertm_info.allowed_modes == L2CAP_FCR_CHAN_OPT_BASIC) 1844 { 1845 if (p_cfg->fcr_present && p_fcr->mode != L2CAP_FCR_BASIC_MODE) 1846 { 1847 L2CAP_TRACE_WARNING ("l2c_fcr_adj_our_req_options (mode %d): ERROR: No FCR options set using BASIC mode", p_fcr->mode); 1848 } 1849 p_fcr->mode = L2CAP_FCR_BASIC_MODE; 1850 } 1851 1852 /* Process the FCR options if initial channel bring-up (not a reconfig request) 1853 ** Determine initial channel mode to try based on our options and remote's features 1854 */ 1855 if (p_cfg->fcr_present && !(p_ccb->config_done & RECONFIG_FLAG)) 1856 { 1857 /* We need to have at least one mode type common with the peer */ 1858 if (!l2c_fcr_chk_chan_modes(p_ccb)) 1859 { 1860 /* Two channels have incompatible supported types */ 1861 l2cu_disconnect_chnl (p_ccb); 1862 return (FALSE); 1863 } 1864 1865 /* Basic is the only common channel mode between the two devices */ 1866 else if (p_ccb->ertm_info.allowed_modes == L2CAP_FCR_CHAN_OPT_BASIC) 1867 { 1868 /* We only want to try Basic, so bypass sending the FCR options entirely */ 1869 p_cfg->fcr_present = FALSE; 1870 p_cfg->fcs_present = FALSE; /* Illegal to use FCS option in basic mode */ 1871 p_cfg->ext_flow_spec_present = FALSE; /* Illegal to use extended flow spec in basic mode */ 1872 } 1873 1874 /* We have at least one non-basic mode available 1875 * Override mode from available mode options based on preference, if needed 1876 */ 1877 else 1878 { 1879 /* If peer does not support STREAMING, try ERTM */ 1880 if (p_fcr->mode == L2CAP_FCR_STREAM_MODE && !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_STREAM)) 1881 { 1882 L2CAP_TRACE_DEBUG ("L2C CFG: mode is STREAM, but peer does not support; Try ERTM"); 1883 p_fcr->mode = L2CAP_FCR_ERTM_MODE; 1884 } 1885 1886 /* If peer does not support ERTM, try BASIC (will support this if made it here in the code) */ 1887 if (p_fcr->mode == L2CAP_FCR_ERTM_MODE && !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM)) 1888 { 1889 L2CAP_TRACE_DEBUG ("L2C CFG: mode is ERTM, but peer does not support; Try BASIC"); 1890 p_fcr->mode = L2CAP_FCR_BASIC_MODE; 1891 } 1892 } 1893 1894 if (p_fcr->mode != L2CAP_FCR_BASIC_MODE) 1895 { 1896 /* MTU must be smaller than buffer size */ 1897 if ( (p_cfg->mtu_present) && (p_cfg->mtu > p_ccb->max_rx_mtu) ) 1898 { 1899 L2CAP_TRACE_WARNING ("L2CAP - MTU: %u larger than buf size: %u", p_cfg->mtu, p_ccb->max_rx_mtu); 1900 return (FALSE); 1901 } 1902 1903 /* application want to use the default MPS */ 1904 if (p_fcr->mps == L2CAP_DEFAULT_ERM_MPS) 1905 { 1906 p_fcr->mps = L2CAP_MPS_OVER_BR_EDR; 1907 } 1908 /* MPS must be less than MTU */ 1909 else if (p_fcr->mps > p_ccb->max_rx_mtu) 1910 { 1911 L2CAP_TRACE_WARNING ("L2CAP - MPS %u invalid MTU: %u", p_fcr->mps, p_ccb->max_rx_mtu); 1912 return (FALSE); 1913 } 1914 1915 /* We always initially read into the HCI buffer pool, so make sure it fits */ 1916 if (p_fcr->mps > (L2CAP_MTU_SIZE - L2CAP_MAX_HEADER_FCS)) 1917 p_fcr->mps = L2CAP_MTU_SIZE - L2CAP_MAX_HEADER_FCS; 1918 } 1919 else 1920 { 1921 p_cfg->fcs_present = FALSE; /* Illegal to use FCS option in basic mode */ 1922 p_cfg->ext_flow_spec_present = FALSE; /* Illegal to use extended flow spec in basic mode */ 1923 } 1924 1925 p_ccb->our_cfg.fcr = *p_fcr; 1926 } 1927 else /* Not sure how to send a reconfiguration(??) should fcr be included? */ 1928 { 1929 p_ccb->our_cfg.fcr_present = FALSE; 1930 } 1931 1932 return (TRUE); 1933} 1934 1935 1936/******************************************************************************* 1937** 1938** Function l2c_fcr_adj_monitor_retran_timeout 1939** 1940** Description Overrides monitor/retrans timer value based on controller 1941** 1942** Returns None 1943** 1944*******************************************************************************/ 1945void l2c_fcr_adj_monitor_retran_timeout (tL2C_CCB *p_ccb) 1946{ 1947 assert(p_ccb != NULL); 1948 1949 /* adjust our monitor/retran timeout */ 1950 if (p_ccb->out_cfg_fcr_present) 1951 { 1952 /* 1953 ** if we requestd ERTM or accepted ERTM 1954 ** We may accept ERTM even if we didn't request ERTM, in case of requesting STREAM 1955 */ 1956 if ((p_ccb->our_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) 1957 ||(p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE)) 1958 { 1959 /* upper layer setting is ignored */ 1960 p_ccb->our_cfg.fcr.mon_tout = L2CAP_MIN_MONITOR_TOUT; 1961 p_ccb->our_cfg.fcr.rtrans_tout = L2CAP_MIN_RETRANS_TOUT; 1962 } 1963 else 1964 { 1965 p_ccb->our_cfg.fcr.mon_tout = 0; 1966 p_ccb->our_cfg.fcr.rtrans_tout = 0; 1967 } 1968 1969 L2CAP_TRACE_DEBUG ("l2c_fcr_adj_monitor_retran_timeout: mon_tout:%d, rtrans_tout:%d", 1970 p_ccb->our_cfg.fcr.mon_tout, p_ccb->our_cfg.fcr.rtrans_tout); 1971 } 1972} 1973/******************************************************************************* 1974** 1975** Function l2c_fcr_adj_our_rsp_options 1976** 1977** Description Overrides any neccesary FCR options passed in from 1978** L2CA_ConfigRsp based on our FCR options. 1979** Only makes adjustments if channel is in ERTM mode. 1980** 1981** Returns None 1982** 1983*******************************************************************************/ 1984void l2c_fcr_adj_our_rsp_options (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg) 1985{ 1986 assert(p_ccb != NULL); 1987 assert(p_cfg != NULL); 1988 1989 /* adjust our monitor/retran timeout */ 1990 l2c_fcr_adj_monitor_retran_timeout(p_ccb); 1991 1992 p_cfg->fcr_present = p_ccb->out_cfg_fcr_present; 1993 1994 if (p_cfg->fcr_present) 1995 { 1996// btla-specific ++ 1997 /* Temporary - until a better algorithm is implemented */ 1998 /* 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. */ 1999 /* Note: peer is not guaranteed to obey our adjustment */ 2000 if (p_ccb->peer_cfg.fcr.tx_win_sz > p_ccb->our_cfg.fcr.tx_win_sz) 2001 { 2002 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); 2003 p_ccb->peer_cfg.fcr.tx_win_sz = p_ccb->our_cfg.fcr.tx_win_sz; 2004 } 2005// btla-specific -- 2006 2007 p_cfg->fcr.mode = p_ccb->peer_cfg.fcr.mode; 2008 p_cfg->fcr.tx_win_sz = p_ccb->peer_cfg.fcr.tx_win_sz; 2009 p_cfg->fcr.max_transmit = p_ccb->peer_cfg.fcr.max_transmit; 2010 p_cfg->fcr.mps = p_ccb->peer_cfg.fcr.mps; 2011 p_cfg->fcr.rtrans_tout = p_ccb->our_cfg.fcr.rtrans_tout; 2012 p_cfg->fcr.mon_tout = p_ccb->our_cfg.fcr.mon_tout; 2013 } 2014} 2015 2016/******************************************************************************* 2017** 2018** Function l2c_fcr_renegotiate_chan 2019** 2020** Description Called upon unsuccessful peer response to config request. 2021** If the error is because of the channel mode, it will try 2022** to resend using another supported optional channel. 2023** 2024** Returns TRUE if resent configuration, False if channel matches or 2025** cannot match. 2026** 2027*******************************************************************************/ 2028BOOLEAN l2c_fcr_renegotiate_chan(tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg) 2029{ 2030 assert(p_ccb != NULL); 2031 assert(p_cfg != NULL); 2032 2033 UINT8 peer_mode = p_ccb->our_cfg.fcr.mode; 2034 BOOLEAN can_renegotiate; 2035 2036 /* Skip if this is a reconfiguration from OPEN STATE or if FCR is not returned */ 2037 if (!p_cfg->fcr_present || (p_ccb->config_done & RECONFIG_FLAG)) 2038 return (FALSE); 2039 2040 /* Only retry if there are more channel options to try */ 2041 if (p_cfg->result == L2CAP_CFG_UNACCEPTABLE_PARAMS) 2042 { 2043 peer_mode = (p_cfg->fcr_present) ? p_cfg->fcr.mode : L2CAP_FCR_BASIC_MODE; 2044 2045 if (p_ccb->our_cfg.fcr.mode != peer_mode) 2046 { 2047 2048 if ((--p_ccb->fcr_cfg_tries) == 0) 2049 { 2050 p_cfg->result = L2CAP_CFG_FAILED_NO_REASON; 2051 L2CAP_TRACE_WARNING ("l2c_fcr_renegotiate_chan (Max retries exceeded)"); 2052 } 2053 2054 can_renegotiate = FALSE; 2055 2056 /* Try another supported mode if available based on our last attempted channel */ 2057 switch (p_ccb->our_cfg.fcr.mode) 2058 { 2059 /* Our Streaming mode request was unnacceptable; try ERTM or Basic */ 2060 case L2CAP_FCR_STREAM_MODE: 2061 /* Peer wants ERTM and we support it */ 2062 if ( (peer_mode == L2CAP_FCR_ERTM_MODE) && (p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM) ) 2063 { 2064 L2CAP_TRACE_DEBUG ("l2c_fcr_renegotiate_chan(Trying ERTM)"); 2065 p_ccb->our_cfg.fcr.mode = L2CAP_FCR_ERTM_MODE; 2066 can_renegotiate = TRUE; 2067 } 2068 else /* Falls through */ 2069 2070 case L2CAP_FCR_ERTM_MODE: 2071 { 2072 /* We can try basic for any other peer mode if we support it */ 2073 if (p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_BASIC) 2074 { 2075 L2CAP_TRACE_DEBUG ("l2c_fcr_renegotiate_chan(Trying Basic)"); 2076 can_renegotiate = TRUE; 2077 p_ccb->our_cfg.fcr.mode = L2CAP_FCR_BASIC_MODE; 2078 } 2079 } 2080 break; 2081 2082 default: 2083 /* All other scenarios cannot be renegotiated */ 2084 break; 2085 } 2086 2087 if (can_renegotiate) 2088 { 2089 p_ccb->our_cfg.fcr_present = TRUE; 2090 2091 if (p_ccb->our_cfg.fcr.mode == L2CAP_FCR_BASIC_MODE) 2092 { 2093 p_ccb->our_cfg.fcs_present = FALSE; 2094 p_ccb->our_cfg.ext_flow_spec_present = FALSE; 2095 2096 /* Basic Mode uses ACL Data Pool, make sure the MTU fits */ 2097 if ( (p_cfg->mtu_present) && (p_cfg->mtu > L2CAP_MTU_SIZE) ) 2098 { 2099 L2CAP_TRACE_WARNING ("L2CAP - adjust MTU: %u too large", p_cfg->mtu); 2100 p_cfg->mtu = L2CAP_MTU_SIZE; 2101 } 2102 } 2103 2104 l2cu_process_our_cfg_req (p_ccb, &p_ccb->our_cfg); 2105 l2cu_send_peer_config_req (p_ccb, &p_ccb->our_cfg); 2106 btu_start_timer (&p_ccb->timer_entry, BTU_TTYPE_L2CAP_CHNL, L2CAP_CHNL_CFG_TIMEOUT); 2107 return (TRUE); 2108 } 2109 } 2110 } 2111 2112 /* Disconnect if the channels do not match */ 2113 if (p_ccb->our_cfg.fcr.mode != peer_mode) 2114 { 2115 L2CAP_TRACE_WARNING ("L2C CFG: Channels incompatible (local %d, peer %d)", 2116 p_ccb->our_cfg.fcr.mode, peer_mode); 2117 l2cu_disconnect_chnl (p_ccb); 2118 } 2119 2120 return (FALSE); 2121} 2122 2123 2124/******************************************************************************* 2125** 2126** Function l2c_fcr_process_peer_cfg_req 2127** 2128** Description This function is called to process the FCR options passed 2129** in the peer's configuration request. 2130** 2131** Returns UINT8 - L2CAP_PEER_CFG_OK, L2CAP_PEER_CFG_UNACCEPTABLE, 2132** or L2CAP_PEER_CFG_DISCONNECT. 2133** 2134*******************************************************************************/ 2135UINT8 l2c_fcr_process_peer_cfg_req(tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg) 2136{ 2137 assert(p_ccb != NULL); 2138 assert(p_cfg != NULL); 2139 2140 UINT16 max_retrans_size; 2141 UINT8 fcr_ok = L2CAP_PEER_CFG_OK; 2142 2143 p_ccb->p_lcb->w4_info_rsp = FALSE; /* Handles T61x SonyEricsson Bug in Info Request */ 2144 2145 L2CAP_TRACE_EVENT ("l2c_fcr_process_peer_cfg_req() CFG fcr_present:%d fcr.mode:%d CCB FCR mode:%d preferred: %u allowed:%u", 2146 p_cfg->fcr_present, p_cfg->fcr.mode, p_ccb->our_cfg.fcr.mode, p_ccb->ertm_info.preferred_mode, 2147 p_ccb->ertm_info.allowed_modes); 2148 2149 /* If Peer wants basic, we are done (accept it or disconnect) */ 2150 if (p_cfg->fcr.mode == L2CAP_FCR_BASIC_MODE) 2151 { 2152 /* If we do not allow basic, disconnect */ 2153 if ( !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_BASIC) ) 2154 fcr_ok = L2CAP_PEER_CFG_DISCONNECT; 2155 } 2156 2157 /* Need to negotiate if our modes are not the same */ 2158 else if (p_cfg->fcr.mode != p_ccb->ertm_info.preferred_mode) 2159 { 2160 /* If peer wants a mode that we don't support then retry our mode (ex. rtx/flc), OR 2161 ** If we want ERTM and they wanted streaming retry our mode. 2162 ** Note: If we have already determined they support our mode previously 2163 ** from their EXF mask. 2164 */ 2165 if ( (((1 << p_cfg->fcr.mode) & L2CAP_FCR_CHAN_OPT_ALL_MASK) == 0) 2166 || (p_ccb->ertm_info.preferred_mode == L2CAP_FCR_ERTM_MODE) ) 2167 { 2168 p_cfg->fcr.mode = p_ccb->our_cfg.fcr.mode; 2169 p_cfg->fcr.tx_win_sz = p_ccb->our_cfg.fcr.tx_win_sz; 2170 p_cfg->fcr.max_transmit = p_ccb->our_cfg.fcr.max_transmit; 2171 fcr_ok = L2CAP_PEER_CFG_UNACCEPTABLE; 2172 } 2173 2174 /* If we wanted basic, then try to renegotiate it */ 2175 else if (p_ccb->ertm_info.preferred_mode == L2CAP_FCR_BASIC_MODE) 2176 { 2177 p_cfg->fcr.mode = L2CAP_FCR_BASIC_MODE; 2178 p_cfg->fcr.max_transmit = p_cfg->fcr.tx_win_sz = 0; 2179 p_cfg->fcr.rtrans_tout = p_cfg->fcr.mon_tout = p_cfg->fcr.mps = 0; 2180 p_ccb->our_cfg.fcr.rtrans_tout = p_ccb->our_cfg.fcr.mon_tout = p_ccb->our_cfg.fcr.mps = 0; 2181 fcr_ok = L2CAP_PEER_CFG_UNACCEPTABLE; 2182 } 2183 2184 /* Only other valid case is if they want ERTM and we wanted STM which should be 2185 accepted if we support it; otherwise the channel should be disconnected */ 2186 else if ( (p_cfg->fcr.mode != L2CAP_FCR_ERTM_MODE) 2187 || !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM) ) 2188 { 2189 fcr_ok = L2CAP_PEER_CFG_DISCONNECT; 2190 } 2191 } 2192 2193 /* Configuration for FCR channels so make any adjustments and fwd to upper layer */ 2194 if (fcr_ok == L2CAP_PEER_CFG_OK) 2195 { 2196 /* by default don't need to send params in the response */ 2197 p_ccb->out_cfg_fcr_present = FALSE; 2198 2199 /* Make any needed adjustments for the response to the peer */ 2200 if (p_cfg->fcr_present && p_cfg->fcr.mode != L2CAP_FCR_BASIC_MODE) 2201 { 2202 /* Peer desires to bypass FCS check, and streaming or ERTM mode */ 2203 if (p_cfg->fcs_present) 2204 { 2205 p_ccb->peer_cfg.fcs = p_cfg->fcs; 2206 p_ccb->peer_cfg_bits |= L2CAP_CH_CFG_MASK_FCS; 2207 if( p_cfg->fcs == L2CAP_CFG_FCS_BYPASS) 2208 p_ccb->bypass_fcs |= L2CAP_CFG_FCS_PEER; 2209 } 2210 2211 max_retrans_size = GKI_get_pool_bufsize (p_ccb->ertm_info.fcr_tx_pool_id) - sizeof(BT_HDR) 2212 - L2CAP_MIN_OFFSET - L2CAP_SDU_LEN_OFFSET - L2CAP_FCS_LEN; 2213 2214 /* Ensure the MPS is not bigger than the MTU */ 2215 if ( (p_cfg->fcr.mps == 0) || (p_cfg->fcr.mps > p_ccb->peer_cfg.mtu) ) 2216 { 2217 p_cfg->fcr.mps = p_ccb->peer_cfg.mtu; 2218 p_ccb->out_cfg_fcr_present = TRUE; 2219 } 2220 2221 /* Ensure the MPS is not bigger than our retransmission buffer */ 2222 if (p_cfg->fcr.mps > max_retrans_size) 2223 { 2224 L2CAP_TRACE_DEBUG("CFG: Overriding MPS to %d (orig %d)", max_retrans_size, p_cfg->fcr.mps); 2225 2226 p_cfg->fcr.mps = max_retrans_size; 2227 p_ccb->out_cfg_fcr_present = TRUE; 2228 } 2229 2230 if (p_cfg->fcr.mode == L2CAP_FCR_ERTM_MODE || p_cfg->fcr.mode == L2CAP_FCR_STREAM_MODE) 2231 { 2232 /* Always respond with FCR ERTM parameters */ 2233 p_ccb->out_cfg_fcr_present = TRUE; 2234 } 2235 } 2236 2237 /* Everything ok, so save the peer's adjusted fcr options */ 2238 p_ccb->peer_cfg.fcr = p_cfg->fcr; 2239 2240 if (p_cfg->fcr_present) 2241 p_ccb->peer_cfg_bits |= L2CAP_CH_CFG_MASK_FCR; 2242 } 2243 else if (fcr_ok == L2CAP_PEER_CFG_UNACCEPTABLE) 2244 { 2245 /* Allow peer only one retry for mode */ 2246 if (p_ccb->peer_cfg_already_rejected) 2247 fcr_ok = L2CAP_PEER_CFG_DISCONNECT; 2248 else 2249 p_ccb->peer_cfg_already_rejected = TRUE; 2250 } 2251 2252 return (fcr_ok); 2253} 2254 2255#if (L2CAP_ERTM_STATS == TRUE) 2256/******************************************************************************* 2257** 2258** Function l2c_fcr_collect_ack_delay 2259** 2260** Description collect throughput, delay, queue size of waiting ack 2261** 2262** Parameters 2263** tL2C_CCB 2264** 2265** Returns void 2266** 2267*******************************************************************************/ 2268static void l2c_fcr_collect_ack_delay (tL2C_CCB *p_ccb, UINT8 num_bufs_acked) 2269{ 2270 UINT32 index; 2271 BT_HDR *p_buf; 2272 UINT8 *p; 2273 UINT32 timestamp, delay; 2274 UINT8 xx; 2275 UINT8 str[120]; 2276 2277 index = p_ccb->fcrb.ack_delay_avg_index; 2278 2279 /* update sum, max and min of waiting for ack queue size */ 2280 p_ccb->fcrb.ack_q_count_avg[index] += p_ccb->fcrb.waiting_for_ack_q.count; 2281 2282 if ( p_ccb->fcrb.waiting_for_ack_q.count > p_ccb->fcrb.ack_q_count_max[index] ) 2283 p_ccb->fcrb.ack_q_count_max[index] = p_ccb->fcrb.waiting_for_ack_q.count; 2284 2285 if ( p_ccb->fcrb.waiting_for_ack_q.count < p_ccb->fcrb.ack_q_count_min[index] ) 2286 p_ccb->fcrb.ack_q_count_min[index] = p_ccb->fcrb.waiting_for_ack_q.count; 2287 2288 /* update sum, max and min of round trip delay of acking */ 2289 p_buf = (BT_HDR *)(p_ccb->fcrb.waiting_for_ack_q.p_first); 2290 for (xx = 0; (xx < num_bufs_acked)&&(p_buf); xx++) 2291 { 2292 /* adding up length of acked I-frames to get throughput */ 2293 p_ccb->fcrb.throughput[index] += p_buf->len - 8; 2294 2295 if ( xx == num_bufs_acked - 1 ) 2296 { 2297 /* get timestamp from tx I-frame that receiver is acking */ 2298 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + p_buf->len; 2299 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) 2300 { 2301 p += L2CAP_FCS_LEN; 2302 } 2303 2304 STREAM_TO_UINT32 (timestamp, p); 2305 delay = GKI_get_os_tick_count() - timestamp; 2306 2307 p_ccb->fcrb.ack_delay_avg[index] += delay; 2308 if ( delay > p_ccb->fcrb.ack_delay_max[index] ) 2309 p_ccb->fcrb.ack_delay_max[index] = delay; 2310 if ( delay < p_ccb->fcrb.ack_delay_min[index] ) 2311 p_ccb->fcrb.ack_delay_min[index] = delay; 2312 } 2313 2314 p_buf = GKI_getnext(p_buf); 2315 } 2316 2317 p_ccb->fcrb.ack_delay_avg_count++; 2318 2319 /* calculate average and initialize next avg, min and max */ 2320 if (p_ccb->fcrb.ack_delay_avg_count > L2CAP_ERTM_STATS_AVG_NUM_SAMPLES) 2321 { 2322 p_ccb->fcrb.ack_delay_avg_count = 0; 2323 2324 p_ccb->fcrb.ack_q_count_avg[index] /= L2CAP_ERTM_STATS_AVG_NUM_SAMPLES; 2325 p_ccb->fcrb.ack_delay_avg[index] /= L2CAP_ERTM_STATS_AVG_NUM_SAMPLES; 2326 2327 /* calculate throughput */ 2328 timestamp = GKI_get_os_tick_count(); 2329 if (timestamp - p_ccb->fcrb.throughput_start > 0 ) 2330 p_ccb->fcrb.throughput[index] /= (timestamp - p_ccb->fcrb.throughput_start); 2331 2332 p_ccb->fcrb.throughput_start = timestamp; 2333 2334 sprintf(str, "[%02u] throughput: %5u, ack_delay avg:%3u, min:%3u, max:%3u, ack_q_count avg:%3u, min:%3u, max:%3u", 2335 index, p_ccb->fcrb.throughput[index], 2336 p_ccb->fcrb.ack_delay_avg[index], p_ccb->fcrb.ack_delay_min[index], p_ccb->fcrb.ack_delay_max[index], 2337 p_ccb->fcrb.ack_q_count_avg[index], p_ccb->fcrb.ack_q_count_min[index], p_ccb->fcrb.ack_q_count_max[index] ); 2338 2339 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", str); 2340 2341 index = (index + 1) % L2CAP_ERTM_STATS_NUM_AVG; 2342 p_ccb->fcrb.ack_delay_avg_index = index; 2343 2344 p_ccb->fcrb.ack_q_count_max[index] = 0; 2345 p_ccb->fcrb.ack_q_count_min[index] = 0xFFFFFFFF; 2346 p_ccb->fcrb.ack_q_count_avg[index] = 0; 2347 2348 2349 p_ccb->fcrb.ack_delay_max[index] = 0; 2350 p_ccb->fcrb.ack_delay_min[index] = 0xFFFFFFFF; 2351 p_ccb->fcrb.ack_delay_avg[index] = 0; 2352 2353 p_ccb->fcrb.throughput[index] = 0; 2354 } 2355} 2356#endif 2357