1 /****************************************************************************** 2 * 3 * Copyright (C) 2004-2012 Broadcom Corporation 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at: 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 ******************************************************************************/ 18 19 /****************************************************************************** 20 * 21 * This file contains the L2CAP 1.2 Flow Control and retransmissions 22 * functions 23 * 24 ******************************************************************************/ 25 26 #include <stdlib.h> 27 #include <string.h> 28 #include <stdio.h> 29 30 #include "gki.h" 31 #include "bt_types.h" 32 #include "hcimsgs.h" 33 #include "l2cdefs.h" 34 #include "l2c_int.h" 35 #include "l2c_api.h" 36 #include "btu.h" 37 #include "btm_api.h" 38 #include "btm_int.h" 39 40 41 /* Flag passed to retransmit_i_frames() when all packets should be retransmitted */ 42 #define L2C_FCR_RETX_ALL_PKTS 0xFF 43 44 #if BT_TRACE_VERBOSE == TRUE 45 static char *SAR_types[] = { "Unsegmented", "Start", "End", "Continuation" }; 46 static char *SUP_types[] = { "RR", "REJ", "RNR", "SREJ" }; 47 #endif 48 49 /* Look-up table for the CRC calculation */ 50 static const unsigned short crctab[256] = { 51 0x0000, 0xc0c1, 0xc181, 0x0140, 0xc301, 0x03c0, 0x0280, 0xc241, 52 0xc601, 0x06c0, 0x0780, 0xc741, 0x0500, 0xc5c1, 0xc481, 0x0440, 53 0xcc01, 0x0cc0, 0x0d80, 0xcd41, 0x0f00, 0xcfc1, 0xce81, 0x0e40, 54 0x0a00, 0xcac1, 0xcb81, 0x0b40, 0xc901, 0x09c0, 0x0880, 0xc841, 55 0xd801, 0x18c0, 0x1980, 0xd941, 0x1b00, 0xdbc1, 0xda81, 0x1a40, 56 0x1e00, 0xdec1, 0xdf81, 0x1f40, 0xdd01, 0x1dc0, 0x1c80, 0xdc41, 57 0x1400, 0xd4c1, 0xd581, 0x1540, 0xd701, 0x17c0, 0x1680, 0xd641, 58 0xd201, 0x12c0, 0x1380, 0xd341, 0x1100, 0xd1c1, 0xd081, 0x1040, 59 0xf001, 0x30c0, 0x3180, 0xf141, 0x3300, 0xf3c1, 0xf281, 0x3240, 60 0x3600, 0xf6c1, 0xf781, 0x3740, 0xf501, 0x35c0, 0x3480, 0xf441, 61 0x3c00, 0xfcc1, 0xfd81, 0x3d40, 0xff01, 0x3fc0, 0x3e80, 0xfe41, 62 0xfa01, 0x3ac0, 0x3b80, 0xfb41, 0x3900, 0xf9c1, 0xf881, 0x3840, 63 0x2800, 0xe8c1, 0xe981, 0x2940, 0xeb01, 0x2bc0, 0x2a80, 0xea41, 64 0xee01, 0x2ec0, 0x2f80, 0xef41, 0x2d00, 0xedc1, 0xec81, 0x2c40, 65 0xe401, 0x24c0, 0x2580, 0xe541, 0x2700, 0xe7c1, 0xe681, 0x2640, 66 0x2200, 0xe2c1, 0xe381, 0x2340, 0xe101, 0x21c0, 0x2080, 0xe041, 67 0xa001, 0x60c0, 0x6180, 0xa141, 0x6300, 0xa3c1, 0xa281, 0x6240, 68 0x6600, 0xa6c1, 0xa781, 0x6740, 0xa501, 0x65c0, 0x6480, 0xa441, 69 0x6c00, 0xacc1, 0xad81, 0x6d40, 0xaf01, 0x6fc0, 0x6e80, 0xae41, 70 0xaa01, 0x6ac0, 0x6b80, 0xab41, 0x6900, 0xa9c1, 0xa881, 0x6840, 71 0x7800, 0xb8c1, 0xb981, 0x7940, 0xbb01, 0x7bc0, 0x7a80, 0xba41, 72 0xbe01, 0x7ec0, 0x7f80, 0xbf41, 0x7d00, 0xbdc1, 0xbc81, 0x7c40, 73 0xb401, 0x74c0, 0x7580, 0xb541, 0x7700, 0xb7c1, 0xb681, 0x7640, 74 0x7200, 0xb2c1, 0xb381, 0x7340, 0xb101, 0x71c0, 0x7080, 0xb041, 75 0x5000, 0x90c1, 0x9181, 0x5140, 0x9301, 0x53c0, 0x5280, 0x9241, 76 0x9601, 0x56c0, 0x5780, 0x9741, 0x5500, 0x95c1, 0x9481, 0x5440, 77 0x9c01, 0x5cc0, 0x5d80, 0x9d41, 0x5f00, 0x9fc1, 0x9e81, 0x5e40, 78 0x5a00, 0x9ac1, 0x9b81, 0x5b40, 0x9901, 0x59c0, 0x5880, 0x9841, 79 0x8801, 0x48c0, 0x4980, 0x8941, 0x4b00, 0x8bc1, 0x8a81, 0x4a40, 80 0x4e00, 0x8ec1, 0x8f81, 0x4f40, 0x8d01, 0x4dc0, 0x4c80, 0x8c41, 81 0x4400, 0x84c1, 0x8581, 0x4540, 0x8701, 0x47c0, 0x4680, 0x8641, 82 0x8201, 0x42c0, 0x4380, 0x8341, 0x4100, 0x81c1, 0x8081, 0x4040, 83 }; 84 85 86 /******************************************************************************* 87 ** Static local functions 88 */ 89 static BOOLEAN process_reqseq (tL2C_CCB *p_ccb, UINT16 ctrl_word); 90 static void process_s_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word); 91 static void process_i_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word, BOOLEAN delay_ack); 92 static BOOLEAN retransmit_i_frames (tL2C_CCB *p_ccb, UINT8 tx_seq); 93 static void prepare_I_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, BOOLEAN is_retransmission); 94 static void process_stream_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf); 95 static BOOLEAN do_sar_reassembly (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word); 96 97 #if L2CAP_CORRUPT_ERTM_PKTS == TRUE 98 static BOOLEAN l2c_corrupt_the_fcr_packet (tL2C_CCB *p_ccb, BT_HDR *p_buf, 99 BOOLEAN is_rx, UINT16 ctrl_word); 100 static BOOLEAN l2c_bypass_sframe_packet (tL2C_CCB *p_ccb); 101 #endif 102 103 #if (L2CAP_ERTM_STATS == TRUE) 104 static void l2c_fcr_collect_ack_delay (tL2C_CCB *p_ccb, UINT8 num_bufs_acked); 105 #endif 106 107 /******************************************************************************* 108 ** 109 ** Function l2c_fcr_updcrc 110 ** 111 ** Description This function computes the CRC using the look-up table. 112 ** 113 ** Returns CRC 114 ** 115 *******************************************************************************/ 116 unsigned short l2c_fcr_updcrc(unsigned short icrc, unsigned char *icp, int icnt) 117 { 118 register unsigned short crc = icrc; 119 register unsigned char *cp = icp; 120 register int cnt = icnt; 121 122 while (cnt--) 123 { 124 crc = ((crc >> 8) & 0xff) ^ crctab[(crc & 0xff) ^ *cp++]; 125 } 126 127 return(crc); 128 } 129 130 131 /******************************************************************************* 132 ** 133 ** Function l2c_fcr_tx_get_fcs 134 ** 135 ** Description This function computes the CRC for a frame to be TXed. 136 ** 137 ** Returns CRC 138 ** 139 *******************************************************************************/ 140 UINT16 l2c_fcr_tx_get_fcs (BT_HDR *p_buf) 141 { 142 UINT8 *p = ((UINT8 *) (p_buf + 1)) + p_buf->offset; 143 144 return (l2c_fcr_updcrc (L2CAP_FCR_INIT_CRC, p, p_buf->len)); 145 } 146 147 /******************************************************************************* 148 ** 149 ** Function l2c_fcr_rx_get_fcs 150 ** 151 ** Description This function computes the CRC for a received frame. 152 ** 153 ** Returns CRC 154 ** 155 *******************************************************************************/ 156 UINT16 l2c_fcr_rx_get_fcs (BT_HDR *p_buf) 157 { 158 UINT8 *p = ((UINT8 *) (p_buf + 1)) + p_buf->offset; 159 160 /* offset points past the L2CAP header, but the CRC check includes it */ 161 p -= L2CAP_PKT_OVERHEAD; 162 163 return (l2c_fcr_updcrc (L2CAP_FCR_INIT_CRC, p, p_buf->len + L2CAP_PKT_OVERHEAD)); 164 } 165 166 /******************************************************************************* 167 ** 168 ** Function l2c_fcr_start_timer 169 ** 170 ** Description This function starts the (monitor or retransmission) timer. 171 ** 172 ** Returns - 173 ** 174 *******************************************************************************/ 175 void l2c_fcr_start_timer (tL2C_CCB *p_ccb) 176 { 177 UINT32 tout; 178 179 /* The timers which are in milliseconds */ 180 if (p_ccb->fcrb.wait_ack) 181 { 182 tout = (UINT32)p_ccb->our_cfg.fcr.mon_tout; 183 } 184 else 185 { 186 tout = (UINT32)p_ccb->our_cfg.fcr.rtrans_tout; 187 } 188 /* 189 L2CAP_TRACE_DEBUG ("l2c_fcr_start_timer Tout: %u Already Running: %u wait_ack: %u ack_q_count: %u", 190 tout, p_ccb->timer_entry.in_use, p_ccb->fcrb.wait_ack, p_ccb->fcrb.waiting_for_ack_q.count); 191 */ 192 /* Only start a timer that was not started */ 193 if (p_ccb->fcrb.mon_retrans_timer.in_use == 0) 194 btu_start_quick_timer (&p_ccb->fcrb.mon_retrans_timer, BTU_TTYPE_L2CAP_CHNL, tout*QUICK_TIMER_TICKS_PER_SEC/1000); 195 } 196 197 /******************************************************************************* 198 ** 199 ** Function l2c_fcr_stop_timer 200 ** 201 ** Description This function stops the (monitor or transmission) timer. 202 ** 203 ** Returns - 204 ** 205 *******************************************************************************/ 206 void l2c_fcr_stop_timer (tL2C_CCB *p_ccb) 207 { 208 if (p_ccb->fcrb.mon_retrans_timer.in_use) 209 { 210 /* 211 L2CAP_TRACE_DEBUG ("l2c_fcr_stop_timer wait_ack: %u ack_q_count: %u", 212 p_ccb->fcrb.wait_ack, p_ccb->fcrb.waiting_for_ack_q.count); 213 */ 214 btu_stop_quick_timer (&p_ccb->fcrb.mon_retrans_timer); 215 } 216 } 217 218 /******************************************************************************* 219 ** 220 ** Function l2c_fcr_cleanup 221 ** 222 ** Description This function cleans up the variable used for flow-control/retrans. 223 ** 224 ** Returns - 225 ** 226 *******************************************************************************/ 227 void l2c_fcr_cleanup (tL2C_CCB *p_ccb) 228 { 229 tL2C_FCRB *p_fcrb = &p_ccb->fcrb; 230 231 l2c_fcr_stop_timer (p_ccb); 232 233 if (p_fcrb->p_rx_sdu) 234 GKI_freebuf (p_fcrb->p_rx_sdu); 235 236 while (p_fcrb->waiting_for_ack_q.p_first) 237 GKI_freebuf (GKI_dequeue (&p_fcrb->waiting_for_ack_q)); 238 239 while (p_fcrb->srej_rcv_hold_q.p_first) 240 GKI_freebuf (GKI_dequeue (&p_fcrb->srej_rcv_hold_q)); 241 242 while (p_fcrb->retrans_q.p_first) 243 GKI_freebuf (GKI_dequeue (&p_fcrb->retrans_q)); 244 245 btu_stop_quick_timer (&p_fcrb->ack_timer); 246 btu_stop_quick_timer (&p_ccb->fcrb.mon_retrans_timer); 247 248 #if (L2CAP_ERTM_STATS == TRUE) 249 if ( (p_ccb->local_cid >= L2CAP_BASE_APPL_CID) && (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) ) 250 { 251 UINT32 dur = GKI_get_os_tick_count() - p_ccb->fcrb.connect_tick_count; 252 char *p_str = (char *)GKI_getbuf(120); 253 UINT16 i; 254 UINT32 throughput_avg, ack_delay_avg, ack_q_count_avg; 255 256 dur = GKI_OS_TICKS_TO_MS(dur); 257 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, 258 "--- L2CAP ERTM Stats for CID: 0x%04x Duration: %08ums", p_ccb->local_cid, dur); 259 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, 260 "Retransmissions:%08u Times Flow Controlled:%08u Retrans Touts:%08u Ack Touts:%08u", 261 p_ccb->fcrb.pkts_retransmitted, p_ccb->fcrb.xmit_window_closed, p_ccb->fcrb.retrans_touts, p_ccb->fcrb.xmit_ack_touts); 262 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, 263 "Times there is less than 2 packets in controller when flow controlled:%08u", p_ccb->fcrb.controller_idle); 264 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, 265 "max_held_acks:%08u, in_cfg.fcr.tx_win_sz:%08u", p_ccb->fcrb.max_held_acks, p_ccb->peer_cfg.fcr.tx_win_sz ); 266 if (p_str) 267 { 268 sprintf(p_str, "Sent Pkts:%08u Bytes:%10u(%06u/sec) RR:%08u REJ:%08u RNR:%08u SREJ:%08u", 269 p_ccb->fcrb.ertm_pkt_counts[0], p_ccb->fcrb.ertm_byte_counts[0], 270 (dur >= 10 ? (p_ccb->fcrb.ertm_byte_counts[0] * 100) / (dur / 10) : 0), 271 p_ccb->fcrb.s_frames_sent[0], p_ccb->fcrb.s_frames_sent[1], p_ccb->fcrb.s_frames_sent[2], p_ccb->fcrb.s_frames_sent[3]); 272 273 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", p_str); 274 275 sprintf(p_str, "Rcvd Pkts:%08u Bytes:%10u(%06u/sec) RR:%08u REJ:%08u RNR:%08u SREJ:%08u", 276 p_ccb->fcrb.ertm_pkt_counts[1], p_ccb->fcrb.ertm_byte_counts[1], 277 (dur >= 10 ? (p_ccb->fcrb.ertm_byte_counts[1] * 100) / (dur / 10) : 0), 278 p_ccb->fcrb.s_frames_rcvd[0], p_ccb->fcrb.s_frames_rcvd[1], p_ccb->fcrb.s_frames_rcvd[2], p_ccb->fcrb.s_frames_rcvd[3]); 279 280 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", p_str); 281 282 throughput_avg = 0; 283 ack_delay_avg = 0; 284 ack_q_count_avg = 0; 285 286 for (i = 0; i < L2CAP_ERTM_STATS_NUM_AVG; i++ ) 287 { 288 if (i == p_ccb->fcrb.ack_delay_avg_index ) 289 { 290 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, 291 "[%02u] collecting data ...", i ); 292 continue; 293 } 294 295 sprintf(p_str, "[%02u] throughput: %5u, ack_delay avg:%3u, min:%3u, max:%3u, ack_q_count avg:%3u, min:%3u, max:%3u", 296 i, p_ccb->fcrb.throughput[i], 297 p_ccb->fcrb.ack_delay_avg[i], p_ccb->fcrb.ack_delay_min[i], p_ccb->fcrb.ack_delay_max[i], 298 p_ccb->fcrb.ack_q_count_avg[i], p_ccb->fcrb.ack_q_count_min[i], p_ccb->fcrb.ack_q_count_max[i] ); 299 300 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", p_str); 301 302 throughput_avg += p_ccb->fcrb.throughput[i]; 303 ack_delay_avg += p_ccb->fcrb.ack_delay_avg[i]; 304 ack_q_count_avg += p_ccb->fcrb.ack_q_count_avg[i]; 305 } 306 307 throughput_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1); 308 ack_delay_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1); 309 ack_q_count_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1); 310 311 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, 312 "throughput_avg: %8u (kbytes/sec), ack_delay_avg: %8u ms, ack_q_count_avg: %8u", 313 throughput_avg, ack_delay_avg, ack_q_count_avg ); 314 315 GKI_freebuf(p_str); 316 } 317 318 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, 319 "---"); 320 } 321 #endif 322 323 memset (p_fcrb, 0, sizeof (tL2C_FCRB)); 324 } 325 326 /******************************************************************************* 327 ** 328 ** Function l2c_fcr_clone_buf 329 ** 330 ** Description This function allocates and copies requested part of a buffer 331 ** at a new-offset. 332 ** 333 ** Returns pointer to new buffer 334 ** 335 *******************************************************************************/ 336 BT_HDR *l2c_fcr_clone_buf (BT_HDR *p_buf, UINT16 new_offset, UINT16 no_of_bytes, UINT8 pool) 337 { 338 BT_HDR *p_buf2; 339 340 /* If using the common pool, should be at least 10% free. */ 341 if ( (pool == HCI_ACL_POOL_ID) && (GKI_poolutilization (pool) > 90) ) 342 { 343 L2CAP_TRACE_ERROR ("L2CAP - failed to clone buffer on HCI_ACL_POOL_ID Utilization: %u", GKI_poolutilization(pool)); 344 return (NULL); 345 } 346 347 if ((p_buf2 = (BT_HDR *)GKI_getpoolbuf(pool)) != NULL) 348 { 349 UINT16 pool_buf_size = GKI_get_pool_bufsize (pool); 350 351 /* Make sure buffer fits into buffer pool */ 352 if ((no_of_bytes + sizeof(BT_HDR) + new_offset) > pool_buf_size) 353 { 354 L2CAP_TRACE_ERROR("##### l2c_fcr_clone_buf (NumBytes %d) -> Exceeds poolsize %d [bytes %d + BT_HDR %d + offset %d]", 355 (no_of_bytes + sizeof(BT_HDR) + new_offset), 356 pool_buf_size, no_of_bytes, sizeof(BT_HDR), 357 new_offset); 358 359 GKI_freebuf(p_buf2); 360 return (NULL); 361 } 362 363 p_buf2->offset = new_offset; 364 p_buf2->len = no_of_bytes; 365 366 memcpy (((UINT8 *)(p_buf2 + 1)) + p_buf2->offset, 367 ((UINT8 *)(p_buf + 1)) + p_buf->offset, 368 no_of_bytes); 369 } 370 else 371 { 372 L2CAP_TRACE_ERROR ("L2CAP - failed to clone buffer, Pool: %u Count: %u", pool, GKI_poolfreecount(pool)); 373 } 374 375 return (p_buf2); 376 } 377 378 /******************************************************************************* 379 ** 380 ** Function l2c_fcr_is_flow_controlled 381 ** 382 ** Description This function checks if the CCB is flow controlled by peer. 383 ** 384 ** Returns The control word 385 ** 386 *******************************************************************************/ 387 BOOLEAN l2c_fcr_is_flow_controlled (tL2C_CCB *p_ccb) 388 { 389 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) 390 { 391 /* Check if remote side flowed us off or the transmit window is full */ 392 if ( (p_ccb->fcrb.remote_busy == TRUE) 393 || (p_ccb->fcrb.waiting_for_ack_q.count >= p_ccb->peer_cfg.fcr.tx_win_sz) ) 394 { 395 #if (L2CAP_ERTM_STATS == TRUE) 396 if (p_ccb->xmit_hold_q.count != 0) 397 { 398 p_ccb->fcrb.xmit_window_closed++; 399 400 if ((p_ccb->p_lcb->sent_not_acked < 2)&&(l2cb.controller_xmit_window > 0)) 401 p_ccb->fcrb.controller_idle++; 402 } 403 #endif 404 return (TRUE); 405 } 406 } 407 return (FALSE); 408 } 409 410 /******************************************************************************* 411 ** 412 ** Function prepare_I_frame 413 ** 414 ** Description This function sets the FCR variables in an I-frame that is 415 ** about to be sent to HCI for transmission. This may be the 416 ** first time the I-frame is sent, or a retransmission 417 ** 418 ** Returns - 419 ** 420 *******************************************************************************/ 421 static void prepare_I_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, BOOLEAN is_retransmission) 422 { 423 tL2C_FCRB *p_fcrb = &p_ccb->fcrb; 424 UINT8 *p; 425 UINT16 fcs; 426 UINT16 ctrl_word; 427 BOOLEAN set_f_bit = p_fcrb->send_f_rsp; 428 429 p_fcrb->send_f_rsp = FALSE; 430 431 if (is_retransmission) 432 { 433 /* Get the old control word and clear out the old req_seq and F bits */ 434 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + L2CAP_PKT_OVERHEAD; 435 436 STREAM_TO_UINT16 (ctrl_word, p); 437 438 ctrl_word &= ~(L2CAP_FCR_REQ_SEQ_BITS + L2CAP_FCR_F_BIT); 439 } 440 else 441 { 442 ctrl_word = p_buf->layer_specific & L2CAP_FCR_SEG_BITS; /* SAR bits */ 443 ctrl_word |= (p_fcrb->next_tx_seq << L2CAP_FCR_TX_SEQ_BITS_SHIFT); /* Tx Seq */ 444 445 p_fcrb->next_tx_seq = (p_fcrb->next_tx_seq + 1) & L2CAP_FCR_SEQ_MODULO; 446 } 447 448 /* Set the F-bit and reqseq only if using re-transmission mode */ 449 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) 450 { 451 if (set_f_bit) 452 ctrl_word |= L2CAP_FCR_F_BIT; 453 454 ctrl_word |= (p_fcrb->next_seq_expected) << L2CAP_FCR_REQ_SEQ_BITS_SHIFT; 455 456 p_fcrb->last_ack_sent = p_ccb->fcrb.next_seq_expected; 457 458 if (p_ccb->fcrb.ack_timer.in_use) 459 btu_stop_quick_timer (&p_ccb->fcrb.ack_timer); 460 } 461 462 /* Set the control word */ 463 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + L2CAP_PKT_OVERHEAD; 464 465 UINT16_TO_STREAM (p, ctrl_word); 466 467 /* Compute the FCS and add to the end of the buffer if not bypassed */ 468 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) 469 { 470 /* length field in l2cap header has to include FCS length */ 471 p = ((UINT8 *) (p_buf+1)) + p_buf->offset; 472 UINT16_TO_STREAM (p, p_buf->len + L2CAP_FCS_LEN - L2CAP_PKT_OVERHEAD); 473 474 /* Calculate the FCS */ 475 fcs = l2c_fcr_tx_get_fcs(p_buf); 476 477 /* Point to the end of the buffer and put the FCS there */ 478 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + p_buf->len; 479 480 UINT16_TO_STREAM (p, fcs); 481 482 p_buf->len += L2CAP_FCS_LEN; 483 } 484 485 #if BT_TRACE_VERBOSE == TRUE 486 if (is_retransmission) 487 { 488 L2CAP_TRACE_EVENT ("L2CAP eRTM ReTx I-frame CID: 0x%04x Len: %u SAR: %s TxSeq: %u ReqSeq: %u F: %u", 489 p_ccb->local_cid, p_buf->len, 490 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT], 491 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT, 492 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, 493 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); 494 } 495 else 496 { 497 L2CAP_TRACE_EVENT ("L2CAP eRTM Tx I-frame CID: 0x%04x Len: %u SAR: %-12s TxSeq: %u ReqSeq: %u F: %u", 498 p_ccb->local_cid, p_buf->len, 499 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT], 500 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT, 501 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, 502 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); 503 } 504 #endif 505 506 /* Start the retransmission timer if not already running */ 507 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) 508 l2c_fcr_start_timer (p_ccb); 509 } 510 511 /******************************************************************************* 512 ** 513 ** Function l2c_fcr_send_S_frame 514 ** 515 ** Description This function formats and sends an S-frame for transmission. 516 ** 517 ** Returns - 518 ** 519 *******************************************************************************/ 520 void l2c_fcr_send_S_frame (tL2C_CCB *p_ccb, UINT16 function_code, UINT16 pf_bit) 521 { 522 BT_HDR *p_buf; 523 UINT8 *p; 524 UINT16 ctrl_word; 525 UINT16 fcs; 526 527 #if L2CAP_CORRUPT_ERTM_PKTS == TRUE 528 /* Only used for conformance testing */ 529 if (l2c_bypass_sframe_packet (p_ccb)) 530 return; 531 #endif 532 533 if ((!p_ccb->in_use) || (p_ccb->chnl_state != CST_OPEN)) 534 return; 535 536 #if (L2CAP_ERTM_STATS == TRUE) 537 p_ccb->fcrb.s_frames_sent[function_code]++; 538 #endif 539 540 if (pf_bit == L2CAP_FCR_P_BIT) 541 { 542 p_ccb->fcrb.wait_ack = TRUE; 543 544 l2c_fcr_stop_timer (p_ccb); /* Restart the monitor timer */ 545 l2c_fcr_start_timer (p_ccb); 546 } 547 548 /* Create the control word to use */ 549 ctrl_word = (function_code << L2CAP_FCR_SUP_SHIFT) | L2CAP_FCR_S_FRAME_BIT; 550 ctrl_word |= (p_ccb->fcrb.next_seq_expected << L2CAP_FCR_REQ_SEQ_BITS_SHIFT); 551 ctrl_word |= pf_bit; 552 553 if ((p_buf = (BT_HDR *)GKI_getpoolbuf (L2CAP_CMD_POOL_ID)) != NULL) 554 { 555 p_buf->offset = HCI_DATA_PREAMBLE_SIZE; 556 p_buf->len = L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD; 557 558 /* Set the pointer to the beginning of the data */ 559 p = (UINT8 *)(p_buf + 1) + p_buf->offset; 560 561 /* Put in the L2CAP header */ 562 UINT16_TO_STREAM (p, L2CAP_FCR_OVERHEAD + L2CAP_FCS_LEN); 563 UINT16_TO_STREAM (p, p_ccb->remote_cid); 564 UINT16_TO_STREAM (p, ctrl_word); 565 566 /* Compute the FCS and add to the end of the buffer if not bypassed */ 567 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) 568 { 569 fcs = l2c_fcr_tx_get_fcs (p_buf); 570 571 UINT16_TO_STREAM (p, fcs); 572 p_buf->len += L2CAP_FCS_LEN; 573 } 574 else /* rewrite the length without FCS length */ 575 { 576 p -= 6; 577 UINT16_TO_STREAM (p, L2CAP_FCR_OVERHEAD); 578 } 579 580 #if L2CAP_CORRUPT_ERTM_PKTS == TRUE 581 /* Get out if packet was dropped */ 582 if (l2c_corrupt_the_fcr_packet (p_ccb, p_buf, FALSE, ctrl_word)) 583 return; 584 #endif 585 /* Now, the HCI transport header */ 586 p_buf->layer_specific = L2CAP_NON_FLUSHABLE_PKT; 587 l2cu_set_acl_hci_header (p_buf, p_ccb); 588 589 #if BT_TRACE_VERBOSE == TRUE 590 if ((((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 1) 591 || (((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 3)) 592 { 593 L2CAP_TRACE_WARNING ("L2CAP eRTM Tx S-frame CID: 0x%04x ctrlword: 0x%04x Type: %s ReqSeq: %u P: %u F: %u", 594 p_ccb->local_cid, ctrl_word, 595 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT], 596 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, 597 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT, 598 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); 599 L2CAP_TRACE_WARNING (" Buf Len: %u", p_buf->len); 600 } 601 else 602 { 603 L2CAP_TRACE_EVENT ("L2CAP eRTM Tx S-frame CID: 0x%04x ctrlword: 0x%04x Type: %s ReqSeq: %u P: %u F: %u", 604 p_ccb->local_cid, ctrl_word, 605 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT], 606 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, 607 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT, 608 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); 609 L2CAP_TRACE_EVENT (" Buf Len: %u", p_buf->len); 610 } 611 #endif /* BT_TRACE_VERBOSE */ 612 613 l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, p_buf); 614 615 p_ccb->fcrb.last_ack_sent = p_ccb->fcrb.next_seq_expected; 616 617 if (p_ccb->fcrb.ack_timer.in_use) 618 btu_stop_quick_timer (&p_ccb->fcrb.ack_timer); 619 } 620 else 621 { 622 L2CAP_TRACE_ERROR ("l2c_fcr_send_S_frame(No Resources) cid 0x%04x, Type: 0x%4x", 623 p_ccb->local_cid, function_code); 624 } 625 } 626 627 628 /******************************************************************************* 629 ** 630 ** Function l2c_fcr_proc_pdu 631 ** 632 ** Description This function is the entry point for processing of a 633 ** received PDU when in flow control and/or retransmission modes. 634 ** 635 ** Returns - 636 ** 637 *******************************************************************************/ 638 void l2c_fcr_proc_pdu (tL2C_CCB *p_ccb, BT_HDR *p_buf) 639 { 640 UINT8 *p; 641 UINT16 fcs; 642 UINT16 min_pdu_len; 643 UINT16 ctrl_word; 644 645 /* Check the length */ 646 min_pdu_len = (p_ccb->bypass_fcs == L2CAP_BYPASS_FCS) ? 647 (UINT16)L2CAP_FCR_OVERHEAD : (UINT16)(L2CAP_FCS_LEN + L2CAP_FCR_OVERHEAD); 648 649 if (p_buf->len < min_pdu_len) 650 { 651 L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x Len too short: %u", p_ccb->local_cid, p_buf->len); 652 GKI_freebuf (p_buf); 653 return; 654 } 655 656 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_STREAM_MODE) 657 { 658 process_stream_frame (p_ccb, p_buf); 659 return; 660 } 661 662 #if BT_TRACE_VERBOSE == TRUE 663 /* Get the control word */ 664 p = ((UINT8 *)(p_buf+1)) + p_buf->offset; 665 STREAM_TO_UINT16 (ctrl_word, p); 666 667 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) 668 { 669 if ((((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 1) 670 || (((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 3)) 671 { 672 /* REJ or SREJ */ 673 L2CAP_TRACE_WARNING ("L2CAP eRTM Rx S-frame: cid: 0x%04x Len: %u Type: %s ReqSeq: %u P: %u F: %u", 674 p_ccb->local_cid, p_buf->len, 675 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT], 676 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, 677 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT, 678 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); 679 } 680 else 681 { 682 L2CAP_TRACE_EVENT ("L2CAP eRTM Rx S-frame: cid: 0x%04x Len: %u Type: %s ReqSeq: %u P: %u F: %u", 683 p_ccb->local_cid, p_buf->len, 684 SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT], 685 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, 686 (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT, 687 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); 688 } 689 } 690 else 691 { 692 L2CAP_TRACE_EVENT ("L2CAP eRTM Rx I-frame: cid: 0x%04x Len: %u SAR: %-12s TxSeq: %u ReqSeq: %u F: %u", 693 p_ccb->local_cid, p_buf->len, 694 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT], 695 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT, 696 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, 697 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); 698 } 699 700 L2CAP_TRACE_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", 701 p_ccb->fcrb.next_tx_seq, p_ccb->fcrb.last_rx_ack, p_ccb->fcrb.next_seq_expected, 702 p_ccb->fcrb.last_ack_sent, p_ccb->fcrb.waiting_for_ack_q.count, p_ccb->fcrb.num_tries); 703 704 #endif /* BT_TRACE_VERBOSE */ 705 706 #if L2CAP_CORRUPT_ERTM_PKTS == TRUE 707 p = ((UINT8 *)(p_buf+1)) + p_buf->offset; 708 STREAM_TO_UINT16 (ctrl_word, p); 709 710 /* Get out if packet was dropped */ 711 if (l2c_corrupt_the_fcr_packet (p_ccb, p_buf, TRUE, ctrl_word)) 712 return; 713 #endif /* L2CAP_CORRUPT_ERTM_PKTS */ 714 715 /* Verify FCS if using */ 716 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) 717 { 718 p = ((UINT8 *)(p_buf+1)) + p_buf->offset + p_buf->len - L2CAP_FCS_LEN; 719 720 /* Extract and drop the FCS from the packet */ 721 STREAM_TO_UINT16 (fcs, p); 722 p_buf->len -= L2CAP_FCS_LEN; 723 724 if (l2c_fcr_rx_get_fcs(p_buf) != fcs) 725 { 726 L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x BAD FCS", p_ccb->local_cid); 727 GKI_freebuf(p_buf); 728 return; 729 } 730 } 731 732 /* Get the control word */ 733 p = ((UINT8 *)(p_buf+1)) + p_buf->offset; 734 735 STREAM_TO_UINT16 (ctrl_word, p); 736 737 p_buf->len -= L2CAP_FCR_OVERHEAD; 738 p_buf->offset += L2CAP_FCR_OVERHEAD; 739 740 /* If we had a poll bit outstanding, check if we got a final response */ 741 if (p_ccb->fcrb.wait_ack) 742 { 743 /* If final bit not set, ignore the frame unless it is a polled S-frame */ 744 if ( !(ctrl_word & L2CAP_FCR_F_BIT) ) 745 { 746 if ( (ctrl_word & L2CAP_FCR_P_BIT) && (ctrl_word & L2CAP_FCR_S_FRAME_BIT) ) 747 { 748 if (p_ccb->fcrb.srej_sent) 749 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_SREJ, L2CAP_FCR_F_BIT); 750 else if (p_ccb->fcrb.local_busy) 751 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_F_BIT); 752 else 753 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_F_BIT); 754 755 /* Got a poll while in wait_ack state, so re-start our timer with 1-second */ 756 /* This is a small optimization... the monitor timer is 12 secs, but we saw */ 757 /* that if the other side sends us a poll when we are waiting for a final, */ 758 /* then it speeds up recovery significantly if we poll him back soon after his poll. */ 759 btu_start_quick_timer (&p_ccb->fcrb.mon_retrans_timer, BTU_TTYPE_L2CAP_CHNL, QUICK_TIMER_TICKS_PER_SEC); 760 } 761 GKI_freebuf (p_buf); 762 return; 763 } 764 765 p_ccb->fcrb.wait_ack = FALSE; 766 767 /* P and F are mutually exclusive */ 768 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) 769 ctrl_word &= ~L2CAP_FCR_P_BIT; 770 771 if (p_ccb->fcrb.waiting_for_ack_q.count == 0) 772 p_ccb->fcrb.num_tries = 0; 773 774 l2c_fcr_stop_timer (p_ccb); 775 } 776 else 777 { 778 /* Otherwise, ensure the final bit is ignored */ 779 ctrl_word &= ~L2CAP_FCR_F_BIT; 780 } 781 782 /* Process receive sequence number */ 783 if (!process_reqseq (p_ccb, ctrl_word)) 784 { 785 GKI_freebuf (p_buf); 786 return; 787 } 788 789 /* Process based on whether it is an S-frame or an I-frame */ 790 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) 791 process_s_frame (p_ccb, p_buf, ctrl_word); 792 else 793 process_i_frame (p_ccb, p_buf, ctrl_word, FALSE); 794 795 /* Return if the channel got disconnected by a bad packet or max retransmissions */ 796 if ( (!p_ccb->in_use) || (p_ccb->chnl_state != CST_OPEN) ) 797 return; 798 799 /* If we have some buffers held while doing SREJ, and SREJ has cleared, process them now */ 800 if ( (!p_ccb->fcrb.local_busy) && (!p_ccb->fcrb.srej_sent) && (p_ccb->fcrb.srej_rcv_hold_q.count > 0) ) 801 { 802 BUFFER_Q temp_q = p_ccb->fcrb.srej_rcv_hold_q; 803 804 GKI_init_q (&p_ccb->fcrb.srej_rcv_hold_q); 805 806 while ((p_buf = (BT_HDR *)GKI_dequeue (&temp_q)) != NULL) 807 { 808 if (p_ccb->in_use && (p_ccb->chnl_state == CST_OPEN)) 809 { 810 /* Get the control word */ 811 p = ((UINT8 *)(p_buf+1)) + p_buf->offset - L2CAP_FCR_OVERHEAD; 812 813 STREAM_TO_UINT16 (ctrl_word, p); 814 815 L2CAP_TRACE_DEBUG ("l2c_fcr_proc_pdu() CID: 0x%04x Process Buffer from SREJ_Hold_Q TxSeq: %u Expected_Seq: %u", 816 p_ccb->local_cid, (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT, 817 p_ccb->fcrb.next_seq_expected); 818 819 /* Process the SREJ held I-frame, but do not send an RR for each individual frame */ 820 process_i_frame (p_ccb, p_buf, ctrl_word, TRUE); 821 } 822 else 823 GKI_freebuf (p_buf); 824 825 /* If more frames were lost during SREJ, send a REJ */ 826 if (p_ccb->fcrb.rej_after_srej) 827 { 828 p_ccb->fcrb.rej_after_srej = FALSE; 829 p_ccb->fcrb.rej_sent = TRUE; 830 831 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_REJ, 0); 832 } 833 } 834 835 /* Now, if needed, send one RR for the whole held queue */ 836 if ( (!p_ccb->fcrb.local_busy) && (!p_ccb->fcrb.rej_sent) && (!p_ccb->fcrb.srej_sent) 837 && (p_ccb->fcrb.next_seq_expected != p_ccb->fcrb.last_ack_sent) ) 838 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, 0); 839 else 840 { 841 L2CAP_TRACE_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", 842 p_ccb->local_cid, p_ccb->fcrb.local_busy, p_ccb->fcrb.rej_sent, p_ccb->fcrb.srej_sent, p_ccb->fcrb.next_seq_expected, 843 p_ccb->fcrb.last_ack_sent); 844 } 845 } 846 847 /* If a window has opened, check if we can send any more packets */ 848 if ( (p_ccb->fcrb.retrans_q.count || p_ccb->xmit_hold_q.count) 849 && (p_ccb->fcrb.wait_ack == FALSE) 850 && (l2c_fcr_is_flow_controlled (p_ccb) == FALSE) ) 851 { 852 l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, NULL); 853 } 854 } 855 856 /******************************************************************************* 857 ** 858 ** Function l2c_fcr_proc_tout 859 ** 860 ** Description Handle a timeout. We should be in error recovery state. 861 ** 862 ** Returns - 863 ** 864 *******************************************************************************/ 865 void l2c_fcr_proc_tout (tL2C_CCB *p_ccb) 866 { 867 L2CAP_TRACE_DEBUG ("l2c_fcr_proc_tout: CID: 0x%04x num_tries: %u (max: %u) wait_ack: %u ack_q_count: %u", 868 p_ccb->local_cid, p_ccb->fcrb.num_tries, p_ccb->peer_cfg.fcr.max_transmit, 869 p_ccb->fcrb.wait_ack, p_ccb->fcrb.waiting_for_ack_q.count); 870 871 #if (L2CAP_ERTM_STATS == TRUE) 872 p_ccb->fcrb.retrans_touts++; 873 #endif 874 875 if ( (p_ccb->peer_cfg.fcr.max_transmit != 0) && (++p_ccb->fcrb.num_tries > p_ccb->peer_cfg.fcr.max_transmit) ) 876 { 877 l2cu_disconnect_chnl (p_ccb); 878 } 879 else 880 { 881 if (!p_ccb->fcrb.srej_sent && !p_ccb->fcrb.rej_sent) 882 { 883 if (p_ccb->fcrb.local_busy) 884 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_P_BIT); 885 else 886 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_P_BIT); 887 } 888 } 889 } 890 891 892 /******************************************************************************* 893 ** 894 ** Function l2c_fcr_proc_ack_tout 895 ** 896 ** Description Send RR/RNR if we have not acked I frame 897 ** 898 ** Returns - 899 ** 900 *******************************************************************************/ 901 void l2c_fcr_proc_ack_tout (tL2C_CCB *p_ccb) 902 { 903 L2CAP_TRACE_DEBUG ("l2c_fcr_proc_ack_tout: CID: 0x%04x State: %u Wack:%u Rq:%d Acked:%d", p_ccb->local_cid, 904 p_ccb->chnl_state, p_ccb->fcrb.wait_ack, p_ccb->fcrb.next_seq_expected, p_ccb->fcrb.last_ack_sent); 905 906 if ( (p_ccb->chnl_state == CST_OPEN) && (!p_ccb->fcrb.wait_ack) 907 && (p_ccb->fcrb.last_ack_sent != p_ccb->fcrb.next_seq_expected) ) 908 { 909 #if (L2CAP_ERTM_STATS == TRUE) 910 p_ccb->fcrb.xmit_ack_touts++; 911 #endif 912 if (p_ccb->fcrb.local_busy) 913 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, 0); 914 else 915 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, 0); 916 } 917 } 918 919 920 /******************************************************************************* 921 ** 922 ** Function process_reqseq 923 ** 924 ** Description Handle receive sequence number 925 ** 926 ** Returns - 927 ** 928 *******************************************************************************/ 929 static BOOLEAN process_reqseq (tL2C_CCB *p_ccb, UINT16 ctrl_word) 930 { 931 tL2C_FCRB *p_fcrb = &p_ccb->fcrb; 932 UINT8 req_seq, num_bufs_acked, xx; 933 UINT16 ls; 934 UINT16 full_sdus_xmitted; 935 936 /* Receive sequence number does not ack anything for SREJ with P-bit set to zero */ 937 if ( (ctrl_word & L2CAP_FCR_S_FRAME_BIT) 938 && ((ctrl_word & L2CAP_FCR_SUP_BITS) == (L2CAP_FCR_SUP_SREJ << L2CAP_FCR_SUP_SHIFT)) 939 && ((ctrl_word & L2CAP_FCR_P_BIT) == 0) ) 940 { 941 /* If anything still waiting for ack, restart the timer if it was stopped */ 942 if (p_fcrb->waiting_for_ack_q.count) 943 l2c_fcr_start_timer (p_ccb); 944 945 return (TRUE); 946 } 947 948 /* Extract the receive sequence number from the control word */ 949 req_seq = (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT; 950 951 num_bufs_acked = (req_seq - p_fcrb->last_rx_ack) & L2CAP_FCR_SEQ_MODULO; 952 953 /* Verify the request sequence is in range before proceeding */ 954 if (num_bufs_acked > p_fcrb->waiting_for_ack_q.count) 955 { 956 /* The channel is closed if ReqSeq is not in range */ 957 L2CAP_TRACE_WARNING ("L2CAP eRTM Frame BAD Req_Seq - ctrl_word: 0x%04x req_seq 0x%02x last_rx_ack: 0x%02x QCount: %u", 958 ctrl_word, req_seq, p_fcrb->last_rx_ack, p_fcrb->waiting_for_ack_q.count); 959 960 l2cu_disconnect_chnl (p_ccb); 961 return (FALSE); 962 } 963 964 /* 965 L2CAP_TRACE_DEBUG ("L2CAP process_reqseq 0x%02x last_rx_ack: 0x%02x QCount: %u", 966 req_seq, p_fcrb->last_rx_ack, p_fcrb->waiting_for_ack_q.count); 967 */ 968 p_fcrb->last_rx_ack = req_seq; 969 970 /* Now we can release all acknowledged frames, and restart the retransmission timer if needed */ 971 if (num_bufs_acked != 0) 972 { 973 p_fcrb->num_tries = 0; 974 full_sdus_xmitted = 0; 975 976 #if (L2CAP_ERTM_STATS == TRUE) 977 l2c_fcr_collect_ack_delay (p_ccb, num_bufs_acked); 978 #endif 979 980 for (xx = 0; xx < num_bufs_acked; xx++) 981 { 982 ls = ((BT_HDR *)(p_fcrb->waiting_for_ack_q.p_first))->layer_specific & L2CAP_FCR_SAR_BITS; 983 984 if ( (ls == L2CAP_FCR_UNSEG_SDU) || (ls == L2CAP_FCR_END_SDU) ) 985 full_sdus_xmitted++; 986 987 GKI_freebuf (GKI_dequeue (&p_fcrb->waiting_for_ack_q)); 988 } 989 990 /* If we are still in a wait_ack state, do not mess with the timer */ 991 if (!p_ccb->fcrb.wait_ack) 992 l2c_fcr_stop_timer (p_ccb); 993 994 /* Check if we need to call the "packet_sent" callback */ 995 if ( (p_ccb->p_rcb) && (p_ccb->p_rcb->api.pL2CA_TxComplete_Cb) && (full_sdus_xmitted) ) 996 { 997 /* Special case for eRTM, if all packets sent, send 0xFFFF */ 998 if ( (p_fcrb->waiting_for_ack_q.count == 0) && (p_ccb->xmit_hold_q.count == 0) ) 999 full_sdus_xmitted = 0xFFFF; 1000 1001 (*p_ccb->p_rcb->api.pL2CA_TxComplete_Cb)(p_ccb->local_cid, full_sdus_xmitted); 1002 } 1003 } 1004 1005 /* If anything still waiting for ack, restart the timer if it was stopped */ 1006 if (p_fcrb->waiting_for_ack_q.count) 1007 l2c_fcr_start_timer (p_ccb); 1008 1009 return (TRUE); 1010 } 1011 1012 1013 /******************************************************************************* 1014 ** 1015 ** Function process_s_frame 1016 ** 1017 ** Description Process an S frame 1018 ** 1019 ** Returns - 1020 ** 1021 *******************************************************************************/ 1022 static void process_s_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word) 1023 { 1024 tL2C_FCRB *p_fcrb = &p_ccb->fcrb; 1025 UINT16 s_frame_type = (ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT; 1026 BOOLEAN remote_was_busy; 1027 BOOLEAN all_ok = TRUE; 1028 1029 if (p_buf->len != 0) 1030 { 1031 L2CAP_TRACE_WARNING ("Incorrect S-frame Length (%d)", p_buf->len); 1032 } 1033 1034 L2CAP_TRACE_DEBUG ("process_s_frame ctrl_word 0x%04x fcrb_remote_busy:%d", ctrl_word, p_fcrb->remote_busy); 1035 1036 #if (L2CAP_ERTM_STATS == TRUE) 1037 p_ccb->fcrb.s_frames_rcvd[s_frame_type]++; 1038 #endif 1039 1040 if (ctrl_word & L2CAP_FCR_P_BIT) 1041 { 1042 p_fcrb->rej_sent = FALSE; /* After checkpoint, we can send anoher REJ */ 1043 p_fcrb->send_f_rsp = TRUE; /* Set a flag in case an I-frame is pending */ 1044 } 1045 1046 switch (s_frame_type) 1047 { 1048 case L2CAP_FCR_SUP_RR: 1049 remote_was_busy = p_fcrb->remote_busy; 1050 p_fcrb->remote_busy = FALSE; 1051 1052 if ( (ctrl_word & L2CAP_FCR_F_BIT) || (remote_was_busy) ) 1053 all_ok = retransmit_i_frames (p_ccb, L2C_FCR_RETX_ALL_PKTS); 1054 break; 1055 1056 case L2CAP_FCR_SUP_REJ: 1057 p_fcrb->remote_busy = FALSE; 1058 all_ok = retransmit_i_frames (p_ccb, L2C_FCR_RETX_ALL_PKTS); 1059 break; 1060 1061 case L2CAP_FCR_SUP_RNR: 1062 p_fcrb->remote_busy = TRUE; 1063 l2c_fcr_stop_timer (p_ccb); 1064 break; 1065 1066 case L2CAP_FCR_SUP_SREJ: 1067 p_fcrb->remote_busy = FALSE; 1068 all_ok = retransmit_i_frames (p_ccb, (UINT8)((ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT)); 1069 break; 1070 } 1071 1072 if (all_ok) 1073 { 1074 /* If polled, we need to respond with F-bit. Note, we may have sent a I-frame with the F-bit */ 1075 if (p_fcrb->send_f_rsp) 1076 { 1077 if (p_fcrb->srej_sent) 1078 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_SREJ, L2CAP_FCR_F_BIT); 1079 else if (p_fcrb->local_busy) 1080 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_F_BIT); 1081 else 1082 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_F_BIT); 1083 1084 p_fcrb->send_f_rsp = FALSE; 1085 } 1086 } 1087 else 1088 { 1089 L2CAP_TRACE_DEBUG ("process_s_frame hit_max_retries"); 1090 } 1091 1092 GKI_freebuf (p_buf); 1093 } 1094 1095 1096 /******************************************************************************* 1097 ** 1098 ** Function process_i_frame 1099 ** 1100 ** Description Process an I frame 1101 ** 1102 ** Returns - 1103 ** 1104 *******************************************************************************/ 1105 static void process_i_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word, BOOLEAN delay_ack) 1106 { 1107 tL2C_FCRB *p_fcrb = &p_ccb->fcrb; 1108 UINT8 tx_seq, num_lost, num_to_ack, next_srej; 1109 1110 /* If we were doing checkpoint recovery, first retransmit all unacked I-frames */ 1111 if (ctrl_word & L2CAP_FCR_F_BIT) 1112 { 1113 if (!retransmit_i_frames (p_ccb, L2C_FCR_RETX_ALL_PKTS)) 1114 { 1115 GKI_freebuf(p_buf); 1116 return; 1117 } 1118 } 1119 1120 #if (L2CAP_ERTM_STATS == TRUE) 1121 p_ccb->fcrb.ertm_pkt_counts[1]++; 1122 p_ccb->fcrb.ertm_byte_counts[1] += p_buf->len; 1123 #endif 1124 1125 /* Extract the sequence number */ 1126 tx_seq = (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT; 1127 1128 /* If we have flow controlled the peer, ignore any bad I-frames from him */ 1129 if ( (tx_seq != p_fcrb->next_seq_expected) && (p_fcrb->local_busy) ) 1130 { 1131 L2CAP_TRACE_WARNING ("Dropping bad I-Frame since we flowed off, tx_seq:%u", tx_seq); 1132 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, 0); 1133 GKI_freebuf(p_buf); 1134 return; 1135 } 1136 1137 /* If there are no free buffers in the user Rx queue, drop the */ 1138 /* received buffer now before we update any sequence numbers */ 1139 if (GKI_poolfreecount (p_ccb->ertm_info.user_rx_pool_id) == 0) 1140 { 1141 L2CAP_TRACE_WARNING ("L2CAP CID: 0x%04x Dropping I-Frame seq: %u User RX Pool: %u (Size: %u) has no free buffers!!", 1142 p_ccb->local_cid, tx_seq, p_ccb->ertm_info.user_rx_pool_id, 1143 GKI_poolcount (p_ccb->ertm_info.user_rx_pool_id)); 1144 GKI_freebuf(p_buf); 1145 return; 1146 } 1147 1148 /* Check if tx-sequence is the expected one */ 1149 if (tx_seq != p_fcrb->next_seq_expected) 1150 { 1151 num_lost = (tx_seq - p_fcrb->next_seq_expected) & L2CAP_FCR_SEQ_MODULO; 1152 1153 /* Is the frame a duplicate ? If so, just drop it */ 1154 if (num_lost >= p_ccb->our_cfg.fcr.tx_win_sz) 1155 { 1156 /* Duplicate - simply drop it */ 1157 L2CAP_TRACE_WARNING ("process_i_frame() Dropping Duplicate Frame tx_seq:%u ExpectedTxSeq %u", tx_seq, p_fcrb->next_seq_expected); 1158 GKI_freebuf(p_buf); 1159 } 1160 else 1161 { 1162 L2CAP_TRACE_WARNING ("process_i_frame() CID: 0x%04x Lost: %u tx_seq:%u ExpTxSeq %u Rej: %u SRej: %u", 1163 p_ccb->local_cid, num_lost, tx_seq, p_fcrb->next_seq_expected, p_fcrb->rej_sent, p_fcrb->srej_sent); 1164 1165 if (p_fcrb->srej_sent) 1166 { 1167 /* If SREJ sent, save the frame for later processing as long as it is in sequence */ 1168 next_srej = (((BT_HDR *)p_fcrb->srej_rcv_hold_q.p_last)->layer_specific + 1) & L2CAP_FCR_SEQ_MODULO; 1169 1170 if ( (tx_seq == next_srej) && (p_fcrb->srej_rcv_hold_q.count < p_ccb->our_cfg.fcr.tx_win_sz) ) 1171 { 1172 /* If user gave us a pool for held rx buffers, use that */ 1173 if (p_ccb->ertm_info.fcr_rx_pool_id != HCI_ACL_POOL_ID) 1174 { 1175 BT_HDR *p_buf2; 1176 1177 /* Adjust offset and len so that control word is copied */ 1178 p_buf->offset -= L2CAP_FCR_OVERHEAD; 1179 p_buf->len += L2CAP_FCR_OVERHEAD; 1180 1181 p_buf2 = l2c_fcr_clone_buf (p_buf, p_buf->offset, p_buf->len, p_ccb->ertm_info.fcr_rx_pool_id); 1182 1183 if (p_buf2) 1184 { 1185 GKI_freebuf (p_buf); 1186 p_buf = p_buf2; 1187 } 1188 p_buf->offset += L2CAP_FCR_OVERHEAD; 1189 p_buf->len -= L2CAP_FCR_OVERHEAD; 1190 } 1191 L2CAP_TRACE_DEBUG ("process_i_frame() Lost: %u tx_seq:%u ExpTxSeq %u Rej: %u SRej1", 1192 num_lost, tx_seq, p_fcrb->next_seq_expected, p_fcrb->rej_sent); 1193 1194 p_buf->layer_specific = tx_seq; 1195 GKI_enqueue (&p_fcrb->srej_rcv_hold_q, p_buf); 1196 } 1197 else 1198 { 1199 L2CAP_TRACE_WARNING ("process_i_frame() CID: 0x%04x frame dropped in Srej Sent next_srej:%u hold_q.count:%u win_sz:%u", 1200 p_ccb->local_cid, next_srej, p_fcrb->srej_rcv_hold_q.count, p_ccb->our_cfg.fcr.tx_win_sz); 1201 1202 p_fcrb->rej_after_srej = TRUE; 1203 GKI_freebuf (p_buf); 1204 } 1205 } 1206 else if (p_fcrb->rej_sent) 1207 { 1208 L2CAP_TRACE_WARNING ("process_i_frame() CID: 0x%04x Lost: %u tx_seq:%u ExpTxSeq %u Rej: 1 SRej: %u", 1209 p_ccb->local_cid, num_lost, tx_seq, p_fcrb->next_seq_expected, p_fcrb->srej_sent); 1210 1211 /* If REJ sent, just drop the frame */ 1212 GKI_freebuf (p_buf); 1213 } 1214 else 1215 { 1216 L2CAP_TRACE_DEBUG ("process_i_frame() CID: 0x%04x tx_seq:%u ExpTxSeq %u Rej: %u", 1217 p_ccb->local_cid, tx_seq, p_fcrb->next_seq_expected, p_fcrb->rej_sent); 1218 1219 /* If only one lost, we will send SREJ, otherwise we will send REJ */ 1220 if (num_lost > 1) 1221 { 1222 GKI_freebuf (p_buf); 1223 p_fcrb->rej_sent = TRUE; 1224 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_REJ, 0); 1225 } 1226 else 1227 { 1228 if (p_fcrb->srej_rcv_hold_q.count != 0) 1229 { 1230 L2CAP_TRACE_ERROR ("process_i_frame() CID: 0x%04x sending SREJ tx_seq:%d hold_q.count:%u", 1231 p_ccb->local_cid, tx_seq, p_fcrb->srej_rcv_hold_q.count); 1232 } 1233 p_buf->layer_specific = tx_seq; 1234 GKI_enqueue (&p_fcrb->srej_rcv_hold_q, p_buf); 1235 p_fcrb->srej_sent = TRUE; 1236 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_SREJ, 0); 1237 } 1238 btu_stop_quick_timer (&p_ccb->fcrb.ack_timer); 1239 } 1240 } 1241 return; 1242 } 1243 1244 /* Seq number is the next expected. Clear possible reject exception in case it occured */ 1245 p_fcrb->rej_sent = p_fcrb->srej_sent = FALSE; 1246 1247 /* Adjust the next_seq, so that if the upper layer sends more data in the callback 1248 context, the received frame is acked by an I-frame. */ 1249 p_fcrb->next_seq_expected = (tx_seq + 1) & L2CAP_FCR_SEQ_MODULO; 1250 1251 /* If any SAR problem in eRTM mode, spec says disconnect. */ 1252 if (!do_sar_reassembly (p_ccb, p_buf, ctrl_word)) 1253 { 1254 L2CAP_TRACE_WARNING ("process_i_frame() CID: 0x%04x reassembly failed", p_ccb->local_cid); 1255 l2cu_disconnect_chnl (p_ccb); 1256 return; 1257 } 1258 1259 /* RR optimization - if peer can still send us more, then start an ACK timer */ 1260 num_to_ack = (p_fcrb->next_seq_expected - p_fcrb->last_ack_sent) & L2CAP_FCR_SEQ_MODULO; 1261 1262 if ( (num_to_ack < p_ccb->fcrb.max_held_acks) && (!p_fcrb->local_busy) ) 1263 delay_ack = TRUE; 1264 1265 /* We should neve never ack frame if we are not in OPEN state */ 1266 if ((num_to_ack != 0) && p_ccb->in_use && (p_ccb->chnl_state == CST_OPEN)) 1267 { 1268 /* If no frames are awaiting transmission or are held, send an RR or RNR S-frame for ack */ 1269 if (delay_ack) 1270 { 1271 /* If it is the first I frame we did not ack, start ack timer */ 1272 if (!p_ccb->fcrb.ack_timer.in_use) 1273 { 1274 btu_start_quick_timer (&p_ccb->fcrb.ack_timer, BTU_TTYPE_L2CAP_FCR_ACK, 1275 (L2CAP_FCR_ACK_TOUT*QUICK_TIMER_TICKS_PER_SEC)/1000); 1276 } 1277 } 1278 else if ( ((p_ccb->xmit_hold_q.count == 0) || (l2c_fcr_is_flow_controlled (p_ccb))) 1279 && (p_ccb->fcrb.srej_rcv_hold_q.count == 0) ) 1280 { 1281 if (p_fcrb->local_busy) 1282 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, 0); 1283 else 1284 l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, 0); 1285 } 1286 } 1287 } 1288 1289 1290 /******************************************************************************* 1291 ** 1292 ** Function process_stream_frame 1293 ** 1294 ** Description This function processes frames in streaming mode 1295 ** 1296 ** Returns - 1297 ** 1298 *******************************************************************************/ 1299 static void process_stream_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf) 1300 { 1301 UINT16 ctrl_word; 1302 UINT16 fcs; 1303 UINT8 *p; 1304 UINT8 tx_seq; 1305 1306 /* Verify FCS if using */ 1307 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) 1308 { 1309 p = ((UINT8 *)(p_buf+1)) + p_buf->offset + p_buf->len - L2CAP_FCS_LEN; 1310 1311 /* Extract and drop the FCS from the packet */ 1312 STREAM_TO_UINT16 (fcs, p); 1313 p_buf->len -= L2CAP_FCS_LEN; 1314 1315 if (l2c_fcr_rx_get_fcs(p_buf) != fcs) 1316 { 1317 L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x BAD FCS", p_ccb->local_cid); 1318 GKI_freebuf(p_buf); 1319 return; 1320 } 1321 } 1322 1323 /* Get the control word */ 1324 p = ((UINT8 *)(p_buf+1)) + p_buf->offset; 1325 1326 STREAM_TO_UINT16 (ctrl_word, p); 1327 1328 p_buf->len -= L2CAP_FCR_OVERHEAD; 1329 p_buf->offset += L2CAP_FCR_OVERHEAD; 1330 1331 /* Make sure it is an I-frame */ 1332 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) 1333 { 1334 L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x BAD S-frame in streaming mode ctrl_word: 0x%04x", p_ccb->local_cid, ctrl_word); 1335 GKI_freebuf (p_buf); 1336 return; 1337 } 1338 1339 #if BT_TRACE_VERBOSE == TRUE 1340 L2CAP_TRACE_EVENT ("L2CAP eRTM Rx I-frame: cid: 0x%04x Len: %u SAR: %-12s TxSeq: %u ReqSeq: %u F: %u", 1341 p_ccb->local_cid, p_buf->len, 1342 SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT], 1343 (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT, 1344 (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, 1345 (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); 1346 #endif 1347 1348 /* Extract the sequence number */ 1349 tx_seq = (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT; 1350 1351 /* Check if tx-sequence is the expected one */ 1352 if (tx_seq != p_ccb->fcrb.next_seq_expected) 1353 { 1354 L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x Lost frames Exp: %u Got: %u p_rx_sdu: 0x%08x", 1355 p_ccb->local_cid, p_ccb->fcrb.next_seq_expected, tx_seq, p_ccb->fcrb.p_rx_sdu); 1356 1357 /* Lost one or more packets, so flush the SAR queue */ 1358 if (p_ccb->fcrb.p_rx_sdu != NULL) 1359 { 1360 GKI_freebuf (p_ccb->fcrb.p_rx_sdu); 1361 p_ccb->fcrb.p_rx_sdu = NULL; 1362 } 1363 } 1364 1365 p_ccb->fcrb.next_seq_expected = (tx_seq + 1) & L2CAP_FCR_SEQ_MODULO; 1366 1367 if (!do_sar_reassembly (p_ccb, p_buf, ctrl_word)) 1368 { 1369 /* Some sort of SAR error, so flush the SAR queue */ 1370 if (p_ccb->fcrb.p_rx_sdu != NULL) 1371 { 1372 GKI_freebuf (p_ccb->fcrb.p_rx_sdu); 1373 p_ccb->fcrb.p_rx_sdu = NULL; 1374 } 1375 } 1376 } 1377 1378 1379 /******************************************************************************* 1380 ** 1381 ** Function do_sar_reassembly 1382 ** 1383 ** Description Process SAR bits and re-assemble frame 1384 ** 1385 ** Returns TRUE if all OK, else FALSE 1386 ** 1387 *******************************************************************************/ 1388 static BOOLEAN do_sar_reassembly (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word) 1389 { 1390 tL2C_FCRB *p_fcrb = &p_ccb->fcrb; 1391 UINT16 sar_type = ctrl_word & L2CAP_FCR_SEG_BITS; 1392 BOOLEAN packet_ok = TRUE; 1393 UINT8 *p; 1394 1395 /* Check if the SAR state is correct */ 1396 if ((sar_type == L2CAP_FCR_UNSEG_SDU) || (sar_type == L2CAP_FCR_START_SDU)) 1397 { 1398 if (p_fcrb->p_rx_sdu != NULL) 1399 { 1400 L2CAP_TRACE_WARNING ("SAR - got unexpected unsegmented or start SDU Expected len: %u Got so far: %u", 1401 p_fcrb->rx_sdu_len, p_fcrb->p_rx_sdu->len); 1402 1403 packet_ok = FALSE; 1404 } 1405 /* Check the length of the packet */ 1406 if ( (sar_type == L2CAP_FCR_START_SDU) && (p_buf->len < L2CAP_SDU_LEN_OVERHEAD) ) 1407 { 1408 L2CAP_TRACE_WARNING ("SAR start packet too short: %u", p_buf->len); 1409 packet_ok = FALSE; 1410 } 1411 } 1412 else 1413 { 1414 if (p_fcrb->p_rx_sdu == NULL) 1415 { 1416 L2CAP_TRACE_WARNING ("SAR - got unexpected cont or end SDU"); 1417 packet_ok = FALSE; 1418 } 1419 } 1420 1421 if ( (packet_ok) && (sar_type != L2CAP_FCR_UNSEG_SDU) ) 1422 { 1423 p = ((UINT8 *)(p_buf + 1)) + p_buf->offset; 1424 1425 /* For start SDU packet, extract the SDU length */ 1426 if (sar_type == L2CAP_FCR_START_SDU) 1427 { 1428 /* Get the SDU length */ 1429 STREAM_TO_UINT16 (p_fcrb->rx_sdu_len, p); 1430 p_buf->offset += 2; 1431 p_buf->len -= 2; 1432 1433 if (p_fcrb->rx_sdu_len > p_ccb->max_rx_mtu) 1434 { 1435 L2CAP_TRACE_WARNING ("SAR - SDU len: %u larger than MTU: %u", p_fcrb->rx_sdu_len, p_fcrb->rx_sdu_len); 1436 packet_ok = FALSE; 1437 } 1438 else if ((p_fcrb->p_rx_sdu = (BT_HDR *)GKI_getpoolbuf (p_ccb->ertm_info.user_rx_pool_id)) == NULL) 1439 { 1440 L2CAP_TRACE_ERROR ("SAR - no buffer for SDU start user_rx_pool_id:%d", p_ccb->ertm_info.user_rx_pool_id); 1441 packet_ok = FALSE; 1442 } 1443 else 1444 { 1445 p_fcrb->p_rx_sdu->offset = 4; /* this is the minimal offset required by OBX to process incoming packets */ 1446 p_fcrb->p_rx_sdu->len = 0; 1447 } 1448 } 1449 1450 if (packet_ok) 1451 { 1452 if ((p_fcrb->p_rx_sdu->len + p_buf->len) > p_fcrb->rx_sdu_len) 1453 { 1454 L2CAP_TRACE_ERROR ("SAR - SDU len exceeded Type: %u Lengths: %u %u %u", 1455 sar_type, p_fcrb->p_rx_sdu->len, p_buf->len, p_fcrb->rx_sdu_len); 1456 packet_ok = FALSE; 1457 } 1458 else if ( (sar_type == L2CAP_FCR_END_SDU) && ((p_fcrb->p_rx_sdu->len + p_buf->len) != p_fcrb->rx_sdu_len) ) 1459 { 1460 L2CAP_TRACE_WARNING ("SAR - SDU end rcvd but SDU incomplete: %u %u %u", 1461 p_fcrb->p_rx_sdu->len, p_buf->len, p_fcrb->rx_sdu_len); 1462 packet_ok = FALSE; 1463 } 1464 else 1465 { 1466 memcpy (((UINT8 *) (p_fcrb->p_rx_sdu + 1)) + p_fcrb->p_rx_sdu->offset + p_fcrb->p_rx_sdu->len, p, p_buf->len); 1467 1468 p_fcrb->p_rx_sdu->len += p_buf->len; 1469 1470 GKI_freebuf (p_buf); 1471 p_buf = NULL; 1472 1473 if (sar_type == L2CAP_FCR_END_SDU) 1474 { 1475 p_buf = p_fcrb->p_rx_sdu; 1476 p_fcrb->p_rx_sdu = NULL; 1477 } 1478 } 1479 } 1480 } 1481 1482 if (packet_ok == FALSE) 1483 { 1484 GKI_freebuf (p_buf); 1485 } 1486 else if (p_buf != NULL) 1487 { 1488 #if (L2CAP_NUM_FIXED_CHNLS > 0) 1489 if (p_ccb->local_cid < L2CAP_BASE_APPL_CID && 1490 (p_ccb->local_cid >= L2CAP_FIRST_FIXED_CHNL && p_ccb->local_cid <= L2CAP_LAST_FIXED_CHNL)) 1491 { 1492 if (l2cb.fixed_reg[p_ccb->local_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb) 1493 (*l2cb.fixed_reg[p_ccb->local_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb)(p_ccb->p_lcb->remote_bd_addr, p_buf); 1494 } 1495 else 1496 #endif 1497 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DATA, p_buf); 1498 } 1499 1500 return (packet_ok); 1501 } 1502 1503 1504 /******************************************************************************* 1505 ** 1506 ** Function retransmit_i_frames 1507 ** 1508 ** Description This function retransmits i-frames awaiting acks. 1509 ** 1510 ** Returns BOOLEAN - TRUE if retransmitted 1511 ** 1512 *******************************************************************************/ 1513 static BOOLEAN retransmit_i_frames (tL2C_CCB *p_ccb, UINT8 tx_seq) 1514 { 1515 BT_HDR *p_buf, *p_buf2; 1516 UINT8 *p; 1517 UINT8 buf_seq; 1518 UINT16 ctrl_word; 1519 1520 if ( (p_ccb->fcrb.waiting_for_ack_q.p_first) 1521 && (p_ccb->peer_cfg.fcr.max_transmit != 0) 1522 && (p_ccb->fcrb.num_tries >= p_ccb->peer_cfg.fcr.max_transmit) ) 1523 { 1524 L2CAP_TRACE_EVENT ("Max Tries Exceeded: (last_acq: %d CID: 0x%04x num_tries: %u (max: %u) ack_q_count: %u", 1525 p_ccb->fcrb.last_rx_ack, p_ccb->local_cid, p_ccb->fcrb.num_tries, p_ccb->peer_cfg.fcr.max_transmit, 1526 p_ccb->fcrb.waiting_for_ack_q.count); 1527 1528 l2cu_disconnect_chnl (p_ccb); 1529 return (FALSE); 1530 } 1531 1532 /* tx_seq indicates whether to retransmit a specific sequence or all (if == L2C_FCR_RETX_ALL_PKTS) */ 1533 if (tx_seq != L2C_FCR_RETX_ALL_PKTS) 1534 { 1535 /* If sending only one, the sequence number tells us which one. Look for it. 1536 */ 1537 for (p_buf = (BT_HDR *)p_ccb->fcrb.waiting_for_ack_q.p_first; p_buf; p_buf = (BT_HDR *)GKI_getnext (p_buf)) 1538 { 1539 /* Get the old control word */ 1540 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + L2CAP_PKT_OVERHEAD; 1541 1542 STREAM_TO_UINT16 (ctrl_word, p); 1543 1544 buf_seq = (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT; 1545 1546 L2CAP_TRACE_DEBUG ("retransmit_i_frames() cur seq: %u looking for: %u", buf_seq, tx_seq); 1547 1548 if (tx_seq == buf_seq) 1549 break; 1550 } 1551 1552 if (!p_buf) 1553 { 1554 L2CAP_TRACE_ERROR ("retransmit_i_frames() UNKNOWN seq: %u q_count: %u", tx_seq, p_ccb->fcrb.waiting_for_ack_q.count); 1555 return (TRUE); 1556 } 1557 } 1558 else 1559 { 1560 /* Retransmitting everything. Flush buffers we already put in the link xmit queue. 1561 */ 1562 p_buf = (BT_HDR *)p_ccb->p_lcb->link_xmit_data_q.p_first; 1563 1564 while (p_buf != NULL) 1565 { 1566 /* Do not flush other CIDs or partial segments */ 1567 if ( (p_buf->layer_specific == 0) && (p_buf->event == p_ccb->local_cid) ) 1568 { 1569 p_buf2 = p_buf; 1570 p_buf = (BT_HDR *)GKI_getnext (p_buf); 1571 1572 GKI_remove_from_queue (&p_ccb->p_lcb->link_xmit_data_q, p_buf2); 1573 GKI_freebuf (p_buf2); 1574 } 1575 else 1576 p_buf = (BT_HDR *)GKI_getnext (p_buf); 1577 } 1578 1579 /* Also flush our retransmission queue */ 1580 while (p_ccb->fcrb.retrans_q.p_first) 1581 GKI_freebuf (GKI_dequeue (&p_ccb->fcrb.retrans_q)); 1582 1583 p_buf = (BT_HDR *)p_ccb->fcrb.waiting_for_ack_q.p_first; 1584 } 1585 1586 while (p_buf != NULL) 1587 { 1588 p_buf2 = l2c_fcr_clone_buf (p_buf, p_buf->offset, p_buf->len, p_ccb->ertm_info.fcr_tx_pool_id); 1589 1590 if (p_buf2) 1591 { 1592 p_buf2->layer_specific = p_buf->layer_specific; 1593 1594 GKI_enqueue (&p_ccb->fcrb.retrans_q, p_buf2); 1595 } 1596 1597 if ( (tx_seq != L2C_FCR_RETX_ALL_PKTS) || (p_buf2 == NULL) ) 1598 break; 1599 else 1600 p_buf = (BT_HDR *)GKI_getnext (p_buf); 1601 } 1602 1603 l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, NULL); 1604 1605 if (p_ccb->fcrb.waiting_for_ack_q.count) 1606 { 1607 p_ccb->fcrb.num_tries++; 1608 l2c_fcr_start_timer (p_ccb); 1609 } 1610 1611 return (TRUE); 1612 } 1613 1614 1615 /******************************************************************************* 1616 ** 1617 ** Function l2c_fcr_get_next_xmit_sdu_seg 1618 ** 1619 ** Description Get the next SDU segment to transmit. 1620 ** 1621 ** Returns pointer to buffer with segment or NULL 1622 ** 1623 *******************************************************************************/ 1624 BT_HDR *l2c_fcr_get_next_xmit_sdu_seg (tL2C_CCB *p_ccb, UINT16 max_packet_length) 1625 { 1626 BOOLEAN first_seg = FALSE, /* The segment is the first part of data */ 1627 mid_seg = FALSE, /* The segment is the middle part of data */ 1628 last_seg = FALSE; /* The segment is the last part of data */ 1629 UINT16 sdu_len = 0; 1630 BT_HDR *p_buf, *p_xmit; 1631 UINT8 *p; 1632 UINT16 max_pdu = p_ccb->tx_mps /* Needed? - L2CAP_MAX_HEADER_FCS*/; 1633 1634 /* If there is anything in the retransmit queue, that goes first 1635 */ 1636 if (p_ccb->fcrb.retrans_q.p_first) 1637 { 1638 p_buf = (BT_HDR *)GKI_dequeue (&p_ccb->fcrb.retrans_q); 1639 1640 /* Update Rx Seq and FCS if we acked some packets while this one was queued */ 1641 prepare_I_frame (p_ccb, p_buf, TRUE); 1642 1643 p_buf->event = p_ccb->local_cid; 1644 1645 #if L2CAP_CORRUPT_ERTM_PKTS == TRUE 1646 /* Use sdu_len to hold the control word */ 1647 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + L2CAP_PKT_OVERHEAD; 1648 STREAM_TO_UINT16 (sdu_len, p); 1649 1650 /* Get out if packet was dropped; just pretend it went out */ 1651 if (l2c_corrupt_the_fcr_packet (p_ccb, p_buf, FALSE, sdu_len)) 1652 return (NULL); 1653 #endif /* L2CAP_CORRUPT_ERTM_PKTS */ 1654 1655 #if (L2CAP_ERTM_STATS == TRUE) 1656 p_ccb->fcrb.pkts_retransmitted++; 1657 p_ccb->fcrb.ertm_pkt_counts[0]++; 1658 p_ccb->fcrb.ertm_byte_counts[0] += (p_buf->len - 8); 1659 #endif 1660 return (p_buf); 1661 } 1662 1663 /* For BD/EDR controller, max_packet_length is set to 0 */ 1664 /* For AMP controller, max_packet_length is set by available blocks */ 1665 if ( (max_packet_length > L2CAP_MAX_HEADER_FCS) 1666 && (max_pdu + L2CAP_MAX_HEADER_FCS > max_packet_length) ) 1667 { 1668 max_pdu = max_packet_length - L2CAP_MAX_HEADER_FCS; 1669 } 1670 1671 p_buf = (BT_HDR *)p_ccb->xmit_hold_q.p_first; 1672 1673 /* If there is more data than the MPS, it requires segmentation */ 1674 if (p_buf->len > max_pdu) 1675 { 1676 /* We are using the "event" field to tell is if we already started segmentation */ 1677 if (p_buf->event == 0) 1678 { 1679 first_seg = TRUE; 1680 sdu_len = p_buf->len; 1681 } 1682 else 1683 mid_seg = TRUE; 1684 1685 /* Get a new buffer and copy the data that can be sent in a PDU */ 1686 p_xmit = l2c_fcr_clone_buf (p_buf, L2CAP_MIN_OFFSET + L2CAP_SDU_LEN_OFFSET, 1687 max_pdu, p_ccb->ertm_info.fcr_tx_pool_id); 1688 1689 if (p_xmit != NULL) 1690 { 1691 p_buf->event = p_ccb->local_cid; 1692 p_xmit->event = p_ccb->local_cid; 1693 1694 p_buf->len -= max_pdu; 1695 p_buf->offset += max_pdu; 1696 1697 /* copy PBF setting */ 1698 p_xmit->layer_specific = p_buf->layer_specific; 1699 } 1700 else /* Should never happen if the application has configured buffers correctly */ 1701 { 1702 L2CAP_TRACE_ERROR ("L2CAP - cannot get buffer, for segmentation, pool: %u", p_ccb->ertm_info.fcr_tx_pool_id); 1703 return (NULL); 1704 } 1705 } 1706 else /* Use the original buffer if no segmentation, or the last segment */ 1707 { 1708 p_xmit = (BT_HDR *)GKI_dequeue (&p_ccb->xmit_hold_q); 1709 1710 if (p_xmit->event != 0) 1711 last_seg = TRUE; 1712 1713 p_xmit->event = p_ccb->local_cid; 1714 } 1715 1716 /* Step back to add the L2CAP headers */ 1717 p_xmit->offset -= (L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD); 1718 p_xmit->len += L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD; 1719 1720 if (first_seg) 1721 { 1722 p_xmit->offset -= L2CAP_SDU_LEN_OVERHEAD; 1723 p_xmit->len += L2CAP_SDU_LEN_OVERHEAD; 1724 } 1725 1726 /* Set the pointer to the beginning of the data */ 1727 p = (UINT8 *)(p_xmit + 1) + p_xmit->offset; 1728 1729 /* Now the L2CAP header */ 1730 1731 /* Note: if FCS has to be included then the length is recalculated later */ 1732 UINT16_TO_STREAM (p, p_xmit->len - L2CAP_PKT_OVERHEAD); 1733 1734 UINT16_TO_STREAM (p, p_ccb->remote_cid); 1735 1736 if (first_seg) 1737 { 1738 /* Skip control word and add SDU length */ 1739 p += 2; 1740 UINT16_TO_STREAM (p, sdu_len); 1741 1742 /* We will store the SAR type in layer-specific */ 1743 /* layer_specific is shared with flushable flag(bits 0-1), don't clear it */ 1744 p_xmit->layer_specific |= L2CAP_FCR_START_SDU; 1745 1746 first_seg = FALSE; 1747 } 1748 else if (mid_seg) 1749 p_xmit->layer_specific |= L2CAP_FCR_CONT_SDU; 1750 else if (last_seg) 1751 p_xmit->layer_specific |= L2CAP_FCR_END_SDU; 1752 else 1753 p_xmit->layer_specific |= L2CAP_FCR_UNSEG_SDU; 1754 1755 prepare_I_frame (p_ccb, p_xmit, FALSE); 1756 1757 if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) 1758 { 1759 BT_HDR *p_wack = l2c_fcr_clone_buf (p_xmit, HCI_DATA_PREAMBLE_SIZE, p_xmit->len, p_ccb->ertm_info.fcr_tx_pool_id); 1760 1761 if (!p_wack) 1762 { 1763 L2CAP_TRACE_ERROR ("L2CAP - no buffer for xmit cloning, CID: 0x%04x Pool: %u Count: %u", 1764 p_ccb->local_cid, p_ccb->ertm_info.fcr_tx_pool_id, GKI_poolfreecount(p_ccb->ertm_info.fcr_tx_pool_id)); 1765 1766 /* We will not save the FCS in case we reconfigure and change options */ 1767 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) 1768 p_xmit->len -= L2CAP_FCS_LEN; 1769 1770 /* Pretend we sent it and it got lost */ 1771 GKI_enqueue (&p_ccb->fcrb.waiting_for_ack_q, p_xmit); 1772 return (NULL); 1773 } 1774 else 1775 { 1776 #if (L2CAP_ERTM_STATS == TRUE) 1777 /* set timestamp at the end of tx I-frame to get acking delay */ 1778 p = ((UINT8 *) (p_wack+1)) + p_wack->offset + p_wack->len; 1779 UINT32_TO_STREAM (p, GKI_get_os_tick_count()); 1780 #endif 1781 /* We will not save the FCS in case we reconfigure and change options */ 1782 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) 1783 p_wack->len -= L2CAP_FCS_LEN; 1784 1785 p_wack->layer_specific = p_xmit->layer_specific; 1786 GKI_enqueue (&p_ccb->fcrb.waiting_for_ack_q, p_wack); 1787 } 1788 1789 #if L2CAP_CORRUPT_ERTM_PKTS == TRUE 1790 { 1791 UINT16 ctrl_word; 1792 p = ((UINT8 *) (p_xmit+1)) + p_xmit->offset + L2CAP_PKT_OVERHEAD; 1793 STREAM_TO_UINT16 (ctrl_word, p); 1794 1795 /* Get out if packet was dropped; pretend it was sent */ 1796 if (l2c_corrupt_the_fcr_packet (p_ccb, p_xmit, FALSE, ctrl_word)) 1797 return (NULL); 1798 } 1799 #endif 1800 #if (L2CAP_ERTM_STATS == TRUE) 1801 p_ccb->fcrb.ertm_pkt_counts[0]++; 1802 p_ccb->fcrb.ertm_byte_counts[0] += (p_xmit->len - 8); 1803 #endif 1804 1805 } 1806 1807 return (p_xmit); 1808 } 1809 1810 1811 /******************************************************************************* 1812 ** Configuration negotiation functions 1813 ** 1814 ** The following functions are used in negotiating channel modes during 1815 ** configuration 1816 ********************************************************************************/ 1817 1818 /******************************************************************************* 1819 ** 1820 ** Function l2c_fcr_chk_chan_modes 1821 ** 1822 ** Description Validates and adjusts if necessary, the FCR options 1823 ** based on remote EXT features. 1824 ** 1825 ** Note: This assumes peer EXT Features have been received. 1826 ** Basic mode is used if FCR Options have not been received 1827 ** 1828 ** Returns UINT8 - nonzero if can continue, '0' if no compatible channels 1829 ** 1830 *******************************************************************************/ 1831 UINT8 l2c_fcr_chk_chan_modes (tL2C_CCB *p_ccb) 1832 { 1833 /* Remove nonbasic options that the peer does not support */ 1834 if (!(p_ccb->p_lcb->peer_ext_fea & L2CAP_EXTFEA_ENH_RETRANS)) 1835 p_ccb->ertm_info.allowed_modes &= ~L2CAP_FCR_CHAN_OPT_ERTM; 1836 1837 if (!(p_ccb->p_lcb->peer_ext_fea & L2CAP_EXTFEA_STREAM_MODE)) 1838 p_ccb->ertm_info.allowed_modes &= ~L2CAP_FCR_CHAN_OPT_STREAM; 1839 1840 /* At least one type needs to be set (Basic, ERTM, STM) to continue */ 1841 if (!p_ccb->ertm_info.allowed_modes) 1842 { 1843 L2CAP_TRACE_WARNING ("L2CAP - Peer does not support our desired channel types"); 1844 } 1845 1846 return (p_ccb->ertm_info.allowed_modes); 1847 } 1848 1849 /******************************************************************************* 1850 ** 1851 ** Function l2c_fcr_adj_our_req_options 1852 ** 1853 ** Description Validates and sets up the FCR options passed in from 1854 ** L2CA_ConfigReq based on remote device's features. 1855 ** 1856 ** Returns TRUE if no errors, Otherwise FALSE 1857 ** 1858 *******************************************************************************/ 1859 BOOLEAN l2c_fcr_adj_our_req_options (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg) 1860 { 1861 tL2CAP_FCR_OPTS *p_fcr = &p_cfg->fcr; 1862 1863 if (p_fcr->mode != p_ccb->ertm_info.preferred_mode) 1864 { 1865 L2CAP_TRACE_WARNING ("l2c_fcr_adj_our_req_options - preferred_mode (%d), does not match mode (%d)", 1866 p_ccb->ertm_info.preferred_mode, p_fcr->mode); 1867 1868 /* The preferred mode is passed in through tL2CAP_ERTM_INFO, so override this one */ 1869 p_fcr->mode = p_ccb->ertm_info.preferred_mode; 1870 } 1871 1872 /* If upper layer did not request eRTM mode, BASIC must be used */ 1873 if (p_ccb->ertm_info.allowed_modes == L2CAP_FCR_CHAN_OPT_BASIC) 1874 { 1875 if (p_cfg->fcr_present && p_fcr->mode != L2CAP_FCR_BASIC_MODE) 1876 { 1877 L2CAP_TRACE_WARNING ("l2c_fcr_adj_our_req_options (mode %d): ERROR: No FCR options set using BASIC mode", p_fcr->mode); 1878 } 1879 p_fcr->mode = L2CAP_FCR_BASIC_MODE; 1880 } 1881 1882 /* Process the FCR options if initial channel bring-up (not a reconfig request) 1883 ** Determine initial channel mode to try based on our options and remote's features 1884 */ 1885 if (p_cfg->fcr_present && !(p_ccb->config_done & RECONFIG_FLAG)) 1886 { 1887 /* We need to have at least one mode type common with the peer */ 1888 if (!l2c_fcr_chk_chan_modes(p_ccb)) 1889 { 1890 /* Two channels have incompatible supported types */ 1891 l2cu_disconnect_chnl (p_ccb); 1892 return (FALSE); 1893 } 1894 1895 /* Basic is the only common channel mode between the two devices */ 1896 else if (p_ccb->ertm_info.allowed_modes == L2CAP_FCR_CHAN_OPT_BASIC) 1897 { 1898 /* We only want to try Basic, so bypass sending the FCR options entirely */ 1899 p_cfg->fcr_present = FALSE; 1900 p_cfg->fcs_present = FALSE; /* Illegal to use FCS option in basic mode */ 1901 p_cfg->ext_flow_spec_present = FALSE; /* Illegal to use extended flow spec in basic mode */ 1902 } 1903 1904 /* We have at least one non-basic mode available 1905 * Override mode from available mode options based on preference, if needed 1906 */ 1907 else 1908 { 1909 /* If peer does not support STREAMING, try ERTM */ 1910 if (p_fcr->mode == L2CAP_FCR_STREAM_MODE && !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_STREAM)) 1911 { 1912 L2CAP_TRACE_DEBUG ("L2C CFG: mode is STREAM, but peer does not support; Try ERTM"); 1913 p_fcr->mode = L2CAP_FCR_ERTM_MODE; 1914 } 1915 1916 /* If peer does not support ERTM, try BASIC (will support this if made it here in the code) */ 1917 if (p_fcr->mode == L2CAP_FCR_ERTM_MODE && !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM)) 1918 { 1919 L2CAP_TRACE_DEBUG ("L2C CFG: mode is ERTM, but peer does not support; Try BASIC"); 1920 p_fcr->mode = L2CAP_FCR_BASIC_MODE; 1921 } 1922 } 1923 1924 if (p_fcr->mode != L2CAP_FCR_BASIC_MODE) 1925 { 1926 /* MTU must be smaller than buffer size */ 1927 if ( (p_cfg->mtu_present) && (p_cfg->mtu > p_ccb->max_rx_mtu) ) 1928 { 1929 L2CAP_TRACE_WARNING ("L2CAP - MTU: %u larger than buf size: %u", p_cfg->mtu, p_ccb->max_rx_mtu); 1930 return (FALSE); 1931 } 1932 1933 /* application want to use the default MPS */ 1934 if (p_fcr->mps == L2CAP_DEFAULT_ERM_MPS) 1935 { 1936 p_fcr->mps = L2CAP_MPS_OVER_BR_EDR; 1937 } 1938 /* MPS must be less than MTU */ 1939 else if (p_fcr->mps > p_ccb->max_rx_mtu) 1940 { 1941 L2CAP_TRACE_WARNING ("L2CAP - MPS %u invalid MTU: %u", p_fcr->mps, p_ccb->max_rx_mtu); 1942 return (FALSE); 1943 } 1944 1945 /* We always initially read into the HCI buffer pool, so make sure it fits */ 1946 if (p_fcr->mps > (L2CAP_MTU_SIZE - L2CAP_MAX_HEADER_FCS)) 1947 p_fcr->mps = L2CAP_MTU_SIZE - L2CAP_MAX_HEADER_FCS; 1948 } 1949 else 1950 { 1951 p_cfg->fcs_present = FALSE; /* Illegal to use FCS option in basic mode */ 1952 p_cfg->ext_flow_spec_present = FALSE; /* Illegal to use extended flow spec in basic mode */ 1953 } 1954 1955 p_ccb->our_cfg.fcr = *p_fcr; 1956 } 1957 else /* Not sure how to send a reconfiguration(??) should fcr be included? */ 1958 { 1959 p_ccb->our_cfg.fcr_present = FALSE; 1960 } 1961 1962 return (TRUE); 1963 } 1964 1965 1966 /******************************************************************************* 1967 ** 1968 ** Function l2c_fcr_adj_monitor_retran_timeout 1969 ** 1970 ** Description Overrides monitor/retrans timer value based on controller 1971 ** 1972 ** Returns None 1973 ** 1974 *******************************************************************************/ 1975 void l2c_fcr_adj_monitor_retran_timeout (tL2C_CCB *p_ccb) 1976 { 1977 /* adjust our monitor/retran timeout */ 1978 if (p_ccb->out_cfg_fcr_present) 1979 { 1980 /* 1981 ** if we requestd ERTM or accepted ERTM 1982 ** We may accept ERTM even if we didn't request ERTM, in case of requesting STREAM 1983 */ 1984 if ((p_ccb->our_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) 1985 ||(p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE)) 1986 { 1987 /* upper layer setting is ignored */ 1988 p_ccb->our_cfg.fcr.mon_tout = L2CAP_MIN_MONITOR_TOUT; 1989 p_ccb->our_cfg.fcr.rtrans_tout = L2CAP_MIN_RETRANS_TOUT; 1990 } 1991 else 1992 { 1993 p_ccb->our_cfg.fcr.mon_tout = 0; 1994 p_ccb->our_cfg.fcr.rtrans_tout = 0; 1995 } 1996 1997 L2CAP_TRACE_DEBUG ("l2c_fcr_adj_monitor_retran_timeout: mon_tout:%d, rtrans_tout:%d", 1998 p_ccb->our_cfg.fcr.mon_tout, p_ccb->our_cfg.fcr.rtrans_tout); 1999 } 2000 } 2001 /******************************************************************************* 2002 ** 2003 ** Function l2c_fcr_adj_our_rsp_options 2004 ** 2005 ** Description Overrides any neccesary FCR options passed in from 2006 ** L2CA_ConfigRsp based on our FCR options. 2007 ** Only makes adjustments if channel is in ERTM mode. 2008 ** 2009 ** Returns None 2010 ** 2011 *******************************************************************************/ 2012 void l2c_fcr_adj_our_rsp_options (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg) 2013 { 2014 /* adjust our monitor/retran timeout */ 2015 l2c_fcr_adj_monitor_retran_timeout(p_ccb); 2016 2017 p_cfg->fcr_present = p_ccb->out_cfg_fcr_present; 2018 2019 if (p_cfg->fcr_present) 2020 { 2021 // btla-specific ++ 2022 /* Temporary - until a better algorithm is implemented */ 2023 /* If peer's tx_wnd_sz requires too many buffers for us to support, then adjust it. For now, respond with our own tx_wnd_sz. */ 2024 /* Note: peer is not guaranteed to obey our adjustment */ 2025 if (p_ccb->peer_cfg.fcr.tx_win_sz > p_ccb->our_cfg.fcr.tx_win_sz) 2026 { 2027 L2CAP_TRACE_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); 2028 p_ccb->peer_cfg.fcr.tx_win_sz = p_ccb->our_cfg.fcr.tx_win_sz; 2029 } 2030 // btla-specific -- 2031 2032 p_cfg->fcr.mode = p_ccb->peer_cfg.fcr.mode; 2033 p_cfg->fcr.tx_win_sz = p_ccb->peer_cfg.fcr.tx_win_sz; 2034 p_cfg->fcr.max_transmit = p_ccb->peer_cfg.fcr.max_transmit; 2035 p_cfg->fcr.mps = p_ccb->peer_cfg.fcr.mps; 2036 p_cfg->fcr.rtrans_tout = p_ccb->our_cfg.fcr.rtrans_tout; 2037 p_cfg->fcr.mon_tout = p_ccb->our_cfg.fcr.mon_tout; 2038 } 2039 } 2040 2041 /******************************************************************************* 2042 ** 2043 ** Function l2c_fcr_renegotiate_chan 2044 ** 2045 ** Description Called upon unsuccessful peer response to config request. 2046 ** If the error is because of the channel mode, it will try 2047 ** to resend using another supported optional channel. 2048 ** 2049 ** Returns TRUE if resent configuration, False if channel matches or 2050 ** cannot match. 2051 ** 2052 *******************************************************************************/ 2053 BOOLEAN l2c_fcr_renegotiate_chan(tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg) 2054 { 2055 UINT8 peer_mode = p_ccb->our_cfg.fcr.mode; 2056 BOOLEAN can_renegotiate; 2057 2058 /* Skip if this is a reconfiguration from OPEN STATE or if FCR is not returned */ 2059 if (!p_cfg->fcr_present || (p_ccb->config_done & RECONFIG_FLAG)) 2060 return (FALSE); 2061 2062 /* Only retry if there are more channel options to try */ 2063 if (p_cfg->result == L2CAP_CFG_UNACCEPTABLE_PARAMS) 2064 { 2065 peer_mode = (p_cfg->fcr_present) ? p_cfg->fcr.mode : L2CAP_FCR_BASIC_MODE; 2066 2067 if (p_ccb->our_cfg.fcr.mode != peer_mode) 2068 { 2069 2070 if ((--p_ccb->fcr_cfg_tries) == 0) 2071 { 2072 p_cfg->result = L2CAP_CFG_FAILED_NO_REASON; 2073 L2CAP_TRACE_WARNING ("l2c_fcr_renegotiate_chan (Max retries exceeded)"); 2074 } 2075 2076 can_renegotiate = FALSE; 2077 2078 /* Try another supported mode if available based on our last attempted channel */ 2079 switch (p_ccb->our_cfg.fcr.mode) 2080 { 2081 /* Our Streaming mode request was unnacceptable; try ERTM or Basic */ 2082 case L2CAP_FCR_STREAM_MODE: 2083 /* Peer wants ERTM and we support it */ 2084 if ( (peer_mode == L2CAP_FCR_ERTM_MODE) && (p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM) ) 2085 { 2086 L2CAP_TRACE_DEBUG ("l2c_fcr_renegotiate_chan(Trying ERTM)"); 2087 p_ccb->our_cfg.fcr.mode = L2CAP_FCR_ERTM_MODE; 2088 can_renegotiate = TRUE; 2089 } 2090 else /* Falls through */ 2091 2092 case L2CAP_FCR_ERTM_MODE: 2093 { 2094 /* We can try basic for any other peer mode if we support it */ 2095 if (p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_BASIC) 2096 { 2097 L2CAP_TRACE_DEBUG ("l2c_fcr_renegotiate_chan(Trying Basic)"); 2098 can_renegotiate = TRUE; 2099 p_ccb->our_cfg.fcr.mode = L2CAP_FCR_BASIC_MODE; 2100 } 2101 } 2102 break; 2103 2104 default: 2105 /* All other scenarios cannot be renegotiated */ 2106 break; 2107 } 2108 2109 if (can_renegotiate) 2110 { 2111 p_ccb->our_cfg.fcr_present = TRUE; 2112 2113 if (p_ccb->our_cfg.fcr.mode == L2CAP_FCR_BASIC_MODE) 2114 { 2115 p_ccb->our_cfg.fcs_present = FALSE; 2116 p_ccb->our_cfg.ext_flow_spec_present = FALSE; 2117 2118 /* Basic Mode uses ACL Data Pool, make sure the MTU fits */ 2119 if ( (p_cfg->mtu_present) && (p_cfg->mtu > L2CAP_MTU_SIZE) ) 2120 { 2121 L2CAP_TRACE_WARNING ("L2CAP - adjust MTU: %u too large", p_cfg->mtu); 2122 p_cfg->mtu = L2CAP_MTU_SIZE; 2123 } 2124 } 2125 2126 l2cu_process_our_cfg_req (p_ccb, &p_ccb->our_cfg); 2127 l2cu_send_peer_config_req (p_ccb, &p_ccb->our_cfg); 2128 btu_start_timer (&p_ccb->timer_entry, BTU_TTYPE_L2CAP_CHNL, L2CAP_CHNL_CFG_TIMEOUT); 2129 return (TRUE); 2130 } 2131 } 2132 } 2133 2134 /* Disconnect if the channels do not match */ 2135 if (p_ccb->our_cfg.fcr.mode != peer_mode) 2136 { 2137 L2CAP_TRACE_WARNING ("L2C CFG: Channels incompatible (local %d, peer %d)", 2138 p_ccb->our_cfg.fcr.mode, peer_mode); 2139 l2cu_disconnect_chnl (p_ccb); 2140 } 2141 2142 return (FALSE); 2143 } 2144 2145 2146 /******************************************************************************* 2147 ** 2148 ** Function l2c_fcr_process_peer_cfg_req 2149 ** 2150 ** Description This function is called to process the FCR options passed 2151 ** in the peer's configuration request. 2152 ** 2153 ** Returns UINT8 - L2CAP_PEER_CFG_OK, L2CAP_PEER_CFG_UNACCEPTABLE, 2154 ** or L2CAP_PEER_CFG_DISCONNECT. 2155 ** 2156 *******************************************************************************/ 2157 UINT8 l2c_fcr_process_peer_cfg_req(tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg) 2158 { 2159 UINT16 max_retrans_size; 2160 UINT8 fcr_ok = L2CAP_PEER_CFG_OK; 2161 2162 p_ccb->p_lcb->w4_info_rsp = FALSE; /* Handles T61x SonyEricsson Bug in Info Request */ 2163 2164 L2CAP_TRACE_EVENT ("l2c_fcr_process_peer_cfg_req() CFG fcr_present:%d fcr.mode:%d CCB FCR mode:%d preferred: %u allowed:%u", 2165 p_cfg->fcr_present, p_cfg->fcr.mode, p_ccb->our_cfg.fcr.mode, p_ccb->ertm_info.preferred_mode, 2166 p_ccb->ertm_info.allowed_modes); 2167 2168 /* If Peer wants basic, we are done (accept it or disconnect) */ 2169 if (p_cfg->fcr.mode == L2CAP_FCR_BASIC_MODE) 2170 { 2171 /* If we do not allow basic, disconnect */ 2172 if ( !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_BASIC) ) 2173 fcr_ok = L2CAP_PEER_CFG_DISCONNECT; 2174 } 2175 2176 /* Need to negotiate if our modes are not the same */ 2177 else if (p_cfg->fcr.mode != p_ccb->ertm_info.preferred_mode) 2178 { 2179 /* If peer wants a mode that we don't support then retry our mode (ex. rtx/flc), OR 2180 ** If we want ERTM and they wanted streaming retry our mode. 2181 ** Note: If we have already determined they support our mode previously 2182 ** from their EXF mask. 2183 */ 2184 if ( (((1 << p_cfg->fcr.mode) & L2CAP_FCR_CHAN_OPT_ALL_MASK) == 0) 2185 || (p_ccb->ertm_info.preferred_mode == L2CAP_FCR_ERTM_MODE) ) 2186 { 2187 p_cfg->fcr.mode = p_ccb->our_cfg.fcr.mode; 2188 p_cfg->fcr.tx_win_sz = p_ccb->our_cfg.fcr.tx_win_sz; 2189 p_cfg->fcr.max_transmit = p_ccb->our_cfg.fcr.max_transmit; 2190 fcr_ok = L2CAP_PEER_CFG_UNACCEPTABLE; 2191 } 2192 2193 /* If we wanted basic, then try to renegotiate it */ 2194 else if (p_ccb->ertm_info.preferred_mode == L2CAP_FCR_BASIC_MODE) 2195 { 2196 p_cfg->fcr.mode = L2CAP_FCR_BASIC_MODE; 2197 p_cfg->fcr.max_transmit = p_cfg->fcr.tx_win_sz = 0; 2198 p_cfg->fcr.rtrans_tout = p_cfg->fcr.mon_tout = p_cfg->fcr.mps = 0; 2199 p_ccb->our_cfg.fcr.rtrans_tout = p_ccb->our_cfg.fcr.mon_tout = p_ccb->our_cfg.fcr.mps = 0; 2200 fcr_ok = L2CAP_PEER_CFG_UNACCEPTABLE; 2201 } 2202 2203 /* Only other valid case is if they want ERTM and we wanted STM which should be 2204 accepted if we support it; otherwise the channel should be disconnected */ 2205 else if ( (p_cfg->fcr.mode != L2CAP_FCR_ERTM_MODE) 2206 || !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM) ) 2207 { 2208 fcr_ok = L2CAP_PEER_CFG_DISCONNECT; 2209 } 2210 } 2211 2212 /* Configuration for FCR channels so make any adjustments and fwd to upper layer */ 2213 if (fcr_ok == L2CAP_PEER_CFG_OK) 2214 { 2215 /* by default don't need to send params in the response */ 2216 p_ccb->out_cfg_fcr_present = FALSE; 2217 2218 /* Make any needed adjustments for the response to the peer */ 2219 if (p_cfg->fcr_present && p_cfg->fcr.mode != L2CAP_FCR_BASIC_MODE) 2220 { 2221 /* Peer desires to bypass FCS check, and streaming or ERTM mode */ 2222 if (p_cfg->fcs_present) 2223 { 2224 p_ccb->peer_cfg.fcs = p_cfg->fcs; 2225 p_ccb->peer_cfg_bits |= L2CAP_CH_CFG_MASK_FCS; 2226 if( p_cfg->fcs == L2CAP_CFG_FCS_BYPASS) 2227 p_ccb->bypass_fcs |= L2CAP_CFG_FCS_PEER; 2228 } 2229 2230 max_retrans_size = GKI_get_pool_bufsize (p_ccb->ertm_info.fcr_tx_pool_id) - sizeof(BT_HDR) 2231 - L2CAP_MIN_OFFSET - L2CAP_SDU_LEN_OFFSET - L2CAP_FCS_LEN; 2232 2233 /* Ensure the MPS is not bigger than the MTU */ 2234 if ( (p_cfg->fcr.mps == 0) || (p_cfg->fcr.mps > p_ccb->peer_cfg.mtu) ) 2235 { 2236 p_cfg->fcr.mps = p_ccb->peer_cfg.mtu; 2237 p_ccb->out_cfg_fcr_present = TRUE; 2238 } 2239 2240 /* Ensure the MPS is not bigger than our retransmission buffer */ 2241 if (p_cfg->fcr.mps > max_retrans_size) 2242 { 2243 L2CAP_TRACE_DEBUG("CFG: Overriding MPS to %d (orig %d)", max_retrans_size, p_cfg->fcr.mps); 2244 2245 p_cfg->fcr.mps = max_retrans_size; 2246 p_ccb->out_cfg_fcr_present = TRUE; 2247 } 2248 2249 if (p_cfg->fcr.mode == L2CAP_FCR_ERTM_MODE || p_cfg->fcr.mode == L2CAP_FCR_STREAM_MODE) 2250 { 2251 /* Always respond with FCR ERTM parameters */ 2252 p_ccb->out_cfg_fcr_present = TRUE; 2253 } 2254 } 2255 2256 /* Everything ok, so save the peer's adjusted fcr options */ 2257 p_ccb->peer_cfg.fcr = p_cfg->fcr; 2258 2259 if (p_cfg->fcr_present) 2260 p_ccb->peer_cfg_bits |= L2CAP_CH_CFG_MASK_FCR; 2261 } 2262 else if (fcr_ok == L2CAP_PEER_CFG_UNACCEPTABLE) 2263 { 2264 /* Allow peer only one retry for mode */ 2265 if (p_ccb->peer_cfg_already_rejected) 2266 fcr_ok = L2CAP_PEER_CFG_DISCONNECT; 2267 else 2268 p_ccb->peer_cfg_already_rejected = TRUE; 2269 } 2270 2271 return (fcr_ok); 2272 } 2273 2274 2275 #if L2CAP_CORRUPT_ERTM_PKTS == TRUE 2276 /******************************************************************************* 2277 ** Functions used for testing ERTM mode 2278 */ 2279 /* If FALSE, will also corrupt cid, length, control word, etc. */ 2280 #ifndef L2CAP_CORR_FCS_ONLY 2281 #define L2CAP_CORR_FCS_ONLY TRUE 2282 #endif 2283 2284 #define L2C_DISP_FRAME_SIZE 16 2285 /******************************************************************************* 2286 ** 2287 ** Function l2c_corrupt_the_fcr_packet 2288 ** 2289 ** Description This function is used for testing purposes only. 2290 ** It systematically or randomly corrupts packets used with 2291 ** ERTM channels. 2292 ** 2293 ** Returns BOOLEAN TRUE if packet was dropped, 2294 ** FALSE if fcs corrupted or no corruption 2295 ** 2296 *******************************************************************************/ 2297 static BOOLEAN l2c_corrupt_the_fcr_packet (tL2C_CCB *p_ccb, BT_HDR *p_buf, 2298 BOOLEAN is_rx, UINT16 ctrl_word) 2299 { 2300 tL2C_FCR_TEST_CFG *p_cfg; 2301 UINT32 tc; 2302 UINT8 *p; 2303 UINT32 xx; 2304 char buf[L2C_DISP_FRAME_SIZE]; 2305 2306 if (!p_ccb || !p_ccb->fcrb.test_cb.cfg.in_use) 2307 return FALSE; 2308 2309 /* Prepare bad FCS */ 2310 p = ((UINT8 *) (p_buf + 1)) + p_buf->offset; 2311 tc = GKI_get_os_tick_count(); 2312 tc ^= p[p_buf->len - 1]; 2313 xx = tc % 47; 2314 2315 p_cfg = &p_ccb->fcrb.test_cb.cfg; 2316 #if 0 2317 L2CAP_TRACE_DEBUG ("testcfg: type: %d, freq: %d (NRM-0, RDM-1), is_rx: %d, count: %d", 2318 p_cfg->type, p_cfg->freq, p_cfg->is_rx, p_cfg->count); 2319 #endif 2320 /* If not time to corrupt get out */ 2321 if (p_cfg->freq == L2CAP_FCR_FREQ_RANDOM) 2322 { 2323 if (xx != 0) 2324 return FALSE; 2325 } 2326 else /* check test criteria before corrupting */ 2327 { 2328 if ( (p_cfg->count == 0) 2329 || (p_cfg->is_rx != is_rx) 2330 || ((UINT8)(ctrl_word & L2CAP_FCR_S_FRAME_BIT) != p_cfg->type) ) 2331 { 2332 return FALSE; 2333 } 2334 2335 /* Turn off if done */ 2336 if (--(p_cfg->count) == 0) 2337 { 2338 p_ccb->fcrb.test_cb.cfg.in_use = FALSE; 2339 } 2340 } 2341 2342 #if L2CAP_CORR_FCS_ONLY == TRUE 2343 /* Corrupt the FCS check */ 2344 p[p_buf->len - 1] = p[p_buf->len - 2] = 0; 2345 #else 2346 /* If made it this far packet needs to be corrupted */ 2347 xx = tc % p_buf->len; 2348 2349 /* Make sure the value was changed */ 2350 if (p[xx + 1] == 0) 2351 p[xx + 1] = 0x5A; 2352 2353 p[xx] = p[xx] ^ p[xx + 1]; 2354 2355 #if 1 /* Enable if not wishing to corrupting frame type */ 2356 { 2357 UINT8 *p_temp = ((UINT8 *) (p_buf + 1)) + p_buf->offset; 2358 p_temp += L2CAP_PKT_OVERHEAD; 2359 if ((UINT16)((*p_temp) & 0x01) != (ctrl_word & 0x0001)) 2360 { 2361 (*p_temp) |= (UINT8)(ctrl_word & 0x0001); 2362 } 2363 } 2364 #endif 2365 #endif 2366 2367 if (is_rx) 2368 { 2369 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) 2370 BCM_STRCPY_S(buf, L2C_DISP_FRAME_SIZE, "Rx S-Frame"); 2371 else 2372 BCM_STRCPY_S(buf, L2C_DISP_FRAME_SIZE, "Rx I-Frame"); 2373 } 2374 else 2375 { 2376 if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) 2377 BCM_STRCPY_S(buf, L2C_DISP_FRAME_SIZE, "Tx S-Frame"); 2378 else 2379 BCM_STRCPY_S(buf, L2C_DISP_FRAME_SIZE, "Tx I-Frame"); 2380 } 2381 2382 /* Lastly, just drop packet if FCS is not being used or if Tx */ 2383 if (!is_rx || p_ccb->bypass_fcs == L2CAP_BYPASS_FCS) 2384 { 2385 L2CAP_TRACE_ERROR ("-=-=-=-=-=-=-=- Dropping %s packet (0x%04x) tc: %u Buf Len: %u xx: %u count: %d", 2386 buf, (UINT32)p_buf, tc, p_buf->len, xx, p_cfg->count); 2387 GKI_freebuf(p_buf); 2388 return TRUE; 2389 } 2390 else 2391 { 2392 L2CAP_TRACE_ERROR ("-=-=-=-=-=-=-=- Corrupting %s packet (0x%04x) tc: %u Buf Len: %u xx: %u count: %d", 2393 buf, (UINT32)p_buf, tc, p_buf->len, xx, p_cfg->count); 2394 } 2395 2396 return FALSE; 2397 } 2398 2399 2400 /******************************************************************************* 2401 ** 2402 ** Function L2CA_SetupErtmTest 2403 ** 2404 ** Description This function is used for testing purposes only. 2405 ** It corrupts or drops one or more packets used with ERTM channels. 2406 ** 2407 ** Parameters 2408 ** cid - channel ID (0 uses RFCOMM PSM's CID) 2409 ** 2410 ** type - type of test to run (L2CAP_FCR_TTYPE_CORR_IFRAMES 2411 ** L2CAP_FCR_TTYPE_CORR_SFRAME 2412 ** L2CAP_FCR_TTYPE_STOP_TEST 2413 ** L2CAP_FCR_TTYPE_GET_CID - returns rfcomm cid only) 2414 ** 2415 ** is_rx - TRUE to corrupt Rx packet, FALSE for Tx packet) 2416 ** 2417 ** freq - L2CAP_FCR_FREQ_RANDOM (turns on random corruptions/drops) 2418 ** L2CAP_FCR_FREQ_NORMAL (turns on test with "count" corruptions/drops) 2419 ** 2420 ** count - number of packets in a row to drop or corrupt 2421 ** 2422 ** Returns CID of channel running test 2423 ** 2424 *******************************************************************************/ 2425 UINT16 L2CA_SetupErtmTest (UINT16 cid, UINT8 type, BOOLEAN is_rx, UINT8 freq, UINT16 count) 2426 { 2427 tL2C_CCB *p_ccb = NULL; 2428 tL2C_CCB *p_temp_ccb; 2429 tL2C_FCR_TEST_CB *p_test_cb; 2430 UINT16 xx; 2431 2432 /* If '0' tests run on top of RFCOMM CID if active */ 2433 if (cid == 0) 2434 { 2435 p_temp_ccb = l2cb.ccb_pool; 2436 for (xx = 0; xx < MAX_L2CAP_CHANNELS; xx++, p_temp_ccb++) 2437 { 2438 /* Fixed channels don't have p_rcb's */ 2439 if (p_temp_ccb->in_use && p_temp_ccb->p_rcb && p_temp_ccb->p_rcb->psm == BT_PSM_RFCOMM) 2440 { 2441 p_ccb = p_temp_ccb; 2442 cid = L2CAP_BASE_APPL_CID + xx; 2443 break; 2444 } 2445 } 2446 } 2447 else 2448 p_ccb = l2cu_find_ccb_by_cid (NULL, cid); 2449 2450 if (!p_ccb || type == L2CAP_FCR_TTYPE_GET_CID) 2451 { 2452 if (type == L2CAP_FCR_TTYPE_GET_CID) 2453 { 2454 L2CAP_TRACE_API ("L2CA_SetupErtmTest (GET_CID): cid = 0x%04x", cid); 2455 } 2456 return (cid); 2457 } 2458 2459 p_test_cb = &p_ccb->fcrb.test_cb; 2460 2461 /* Turn off the current test */ 2462 if (type == L2CAP_FCR_TTYPE_STOP_TEST) 2463 { 2464 if (p_test_cb->cfg.in_use) 2465 { 2466 L2CAP_TRACE_ERROR ("L2CA_SetupErtmTest (OFF): cid 0x%04x", cid); 2467 } 2468 p_test_cb->cfg.in_use = FALSE; 2469 p_test_cb->cfg.count = 0; 2470 } 2471 2472 /* Process the new request */ 2473 else if (!p_test_cb->cfg.in_use) 2474 { 2475 /* count must be positive unless random is used */ 2476 if (!count && freq != L2CAP_FCR_FREQ_RANDOM) 2477 { 2478 L2CAP_TRACE_ERROR ("L2CA_SetupErtmTest (FAIL): Count = 0, freq = %d", freq); 2479 return (cid); 2480 } 2481 2482 L2CAP_TRACE_ERROR ("L2CA_SetupErtmTest (START): cid 0x%04x, type %d, is_rx %d, freq %d, count %d", 2483 cid, type, is_rx, freq, count); 2484 2485 p_test_cb->cfg.in_use = TRUE; 2486 p_test_cb->cfg.freq = freq; 2487 p_test_cb->cfg.type = type; 2488 p_test_cb->cfg.is_rx = is_rx; 2489 p_test_cb->cfg.count = count; 2490 } 2491 else /* Test already in progress so ignore */ 2492 { 2493 L2CAP_TRACE_ERROR ("L2CA_SetupErtmTest (ignoring): cid 0x%04x, type %d, is_rx %d, freq %d, count %d", 2494 cid, type, is_rx, freq, count); 2495 } 2496 2497 return (cid); 2498 } 2499 2500 2501 /******************************************************************************* 2502 ** The following routines are only used in conjunction with Conformance testing 2503 ********************************************************************************/ 2504 2505 /******************************************************************************* 2506 ** 2507 ** Function L2CA_SendPolledSFrame 2508 ** 2509 ** Description This function is used for testing purposes only. 2510 ** It Sends a Polled RR or RNR to the peer 2511 ** 2512 ** Parameters 2513 ** cid - channel ID 2514 ** 2515 ** sup_type - (L2CAP_FCR_SUP_RR or L2CAP_FCR_SUP_RNR) 2516 ** 2517 ** Returns void 2518 ** 2519 *******************************************************************************/ 2520 void L2CA_SendPolledSFrame (UINT16 cid, UINT16 sup_type) 2521 { 2522 tL2C_CCB *p_ccb = l2cu_find_ccb_by_cid (NULL, cid); 2523 2524 if (p_ccb && (sup_type == L2CAP_FCR_SUP_RR || sup_type == L2CAP_FCR_SUP_RNR)) 2525 { 2526 l2c_fcr_send_S_frame (p_ccb, sup_type, L2CAP_FCR_P_BIT); 2527 } 2528 else 2529 { 2530 L2CAP_TRACE_ERROR ("L2CA_SendPolledSFrame(ERROR): sup_type %u, p_ccb 0x%07x", 2531 sup_type, (UINT32)p_ccb); 2532 } 2533 } 2534 2535 /******************************************************************************* 2536 ** 2537 ** Function l2c_bypass_sframe_packet 2538 ** 2539 ** Description This function is used for testing purposes only. 2540 ** It returns TRUE if S-Frame should be bypassed. 2541 ** 2542 ** Returns void 2543 ** 2544 *******************************************************************************/ 2545 static BOOLEAN l2c_bypass_sframe_packet (tL2C_CCB *p_ccb) 2546 { 2547 if (p_ccb && p_ccb->fcrb.test_cb.cfm.in_use) 2548 { 2549 if (p_ccb->fcrb.test_cb.cfm.skip_sframe_count > 0) 2550 { 2551 L2CAP_TRACE_ERROR ("l2c_bypass_sframe_packet (count %d)", 2552 p_ccb->fcrb.test_cb.cfm.skip_sframe_count); 2553 2554 if (--p_ccb->fcrb.test_cb.cfm.skip_sframe_count == 0) 2555 p_ccb->fcrb.test_cb.cfm.in_use = FALSE; 2556 2557 /* Bypass sending S-Frame */ 2558 return TRUE; 2559 } 2560 else 2561 p_ccb->fcrb.test_cb.cfm.in_use = FALSE; 2562 } 2563 2564 return FALSE; 2565 } 2566 2567 /******************************************************************************* 2568 ** 2569 ** Function L2CA_BypassSFrame 2570 ** 2571 ** Description This function is used for testing purposes only. 2572 ** It skips sending 'count' S-Frames. 2573 ** 2574 ** Parameters 2575 ** cid - channel ID 2576 ** 2577 ** count - Number of S-Frames to skip sending 2578 ** 2579 ** Returns void 2580 ** 2581 *******************************************************************************/ 2582 void L2CA_BypassSFrame (UINT16 cid, UINT8 count) 2583 { 2584 tL2C_CCB *p_ccb = l2cu_find_ccb_by_cid (NULL, cid); 2585 tL2C_FCR_CFM_TEST_CB *p_test_cb; 2586 2587 if (!p_ccb) 2588 { 2589 L2CAP_TRACE_WARNING ("L2CA_BypassSFrame(ERROR): no p_ccb (0x%07x)", (UINT32)p_ccb); 2590 return; 2591 } 2592 2593 p_test_cb = &p_ccb->fcrb.test_cb.cfm; 2594 2595 /* Initiate test if not active */ 2596 if (!p_test_cb->in_use) 2597 { 2598 p_test_cb->in_use = TRUE; 2599 p_test_cb->skip_sframe_count = count; 2600 } 2601 else 2602 { 2603 L2CAP_TRACE_WARNING ("L2CA_BypassSFrame(ERROR): already in use (ignoring...)"); 2604 } 2605 } 2606 2607 #endif /* L2CAP_CORRUPT_ERTM_PKTS == TRUE */ 2608 2609 #if (L2CAP_ERTM_STATS == TRUE) 2610 /******************************************************************************* 2611 ** 2612 ** Function l2c_fcr_collect_ack_delay 2613 ** 2614 ** Description collect throughput, delay, queue size of waiting ack 2615 ** 2616 ** Parameters 2617 ** tL2C_CCB 2618 ** 2619 ** Returns void 2620 ** 2621 *******************************************************************************/ 2622 static void l2c_fcr_collect_ack_delay (tL2C_CCB *p_ccb, UINT8 num_bufs_acked) 2623 { 2624 UINT32 index; 2625 BT_HDR *p_buf; 2626 UINT8 *p; 2627 UINT32 timestamp, delay; 2628 UINT8 xx; 2629 UINT8 str[120]; 2630 2631 index = p_ccb->fcrb.ack_delay_avg_index; 2632 2633 /* update sum, max and min of waiting for ack queue size */ 2634 p_ccb->fcrb.ack_q_count_avg[index] += p_ccb->fcrb.waiting_for_ack_q.count; 2635 2636 if ( p_ccb->fcrb.waiting_for_ack_q.count > p_ccb->fcrb.ack_q_count_max[index] ) 2637 p_ccb->fcrb.ack_q_count_max[index] = p_ccb->fcrb.waiting_for_ack_q.count; 2638 2639 if ( p_ccb->fcrb.waiting_for_ack_q.count < p_ccb->fcrb.ack_q_count_min[index] ) 2640 p_ccb->fcrb.ack_q_count_min[index] = p_ccb->fcrb.waiting_for_ack_q.count; 2641 2642 /* update sum, max and min of round trip delay of acking */ 2643 p_buf = (BT_HDR *)(p_ccb->fcrb.waiting_for_ack_q.p_first); 2644 for (xx = 0; (xx < num_bufs_acked)&&(p_buf); xx++) 2645 { 2646 /* adding up length of acked I-frames to get throughput */ 2647 p_ccb->fcrb.throughput[index] += p_buf->len - 8; 2648 2649 if ( xx == num_bufs_acked - 1 ) 2650 { 2651 /* get timestamp from tx I-frame that receiver is acking */ 2652 p = ((UINT8 *) (p_buf+1)) + p_buf->offset + p_buf->len; 2653 if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) 2654 { 2655 p += L2CAP_FCS_LEN; 2656 } 2657 2658 STREAM_TO_UINT32 (timestamp, p); 2659 delay = GKI_get_os_tick_count() - timestamp; 2660 2661 p_ccb->fcrb.ack_delay_avg[index] += delay; 2662 if ( delay > p_ccb->fcrb.ack_delay_max[index] ) 2663 p_ccb->fcrb.ack_delay_max[index] = delay; 2664 if ( delay < p_ccb->fcrb.ack_delay_min[index] ) 2665 p_ccb->fcrb.ack_delay_min[index] = delay; 2666 } 2667 2668 p_buf = GKI_getnext(p_buf); 2669 } 2670 2671 p_ccb->fcrb.ack_delay_avg_count++; 2672 2673 /* calculate average and initialize next avg, min and max */ 2674 if (p_ccb->fcrb.ack_delay_avg_count > L2CAP_ERTM_STATS_AVG_NUM_SAMPLES) 2675 { 2676 p_ccb->fcrb.ack_delay_avg_count = 0; 2677 2678 p_ccb->fcrb.ack_q_count_avg[index] /= L2CAP_ERTM_STATS_AVG_NUM_SAMPLES; 2679 p_ccb->fcrb.ack_delay_avg[index] /= L2CAP_ERTM_STATS_AVG_NUM_SAMPLES; 2680 2681 /* calculate throughput */ 2682 timestamp = GKI_get_os_tick_count(); 2683 if (timestamp - p_ccb->fcrb.throughput_start > 0 ) 2684 p_ccb->fcrb.throughput[index] /= (timestamp - p_ccb->fcrb.throughput_start); 2685 2686 p_ccb->fcrb.throughput_start = timestamp; 2687 2688 sprintf(str, "[%02u] throughput: %5u, ack_delay avg:%3u, min:%3u, max:%3u, ack_q_count avg:%3u, min:%3u, max:%3u", 2689 index, p_ccb->fcrb.throughput[index], 2690 p_ccb->fcrb.ack_delay_avg[index], p_ccb->fcrb.ack_delay_min[index], p_ccb->fcrb.ack_delay_max[index], 2691 p_ccb->fcrb.ack_q_count_avg[index], p_ccb->fcrb.ack_q_count_min[index], p_ccb->fcrb.ack_q_count_max[index] ); 2692 2693 BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", str); 2694 2695 index = (index + 1) % L2CAP_ERTM_STATS_NUM_AVG; 2696 p_ccb->fcrb.ack_delay_avg_index = index; 2697 2698 p_ccb->fcrb.ack_q_count_max[index] = 0; 2699 p_ccb->fcrb.ack_q_count_min[index] = 0xFFFFFFFF; 2700 p_ccb->fcrb.ack_q_count_avg[index] = 0; 2701 2702 2703 p_ccb->fcrb.ack_delay_max[index] = 0; 2704 p_ccb->fcrb.ack_delay_min[index] = 0xFFFFFFFF; 2705 p_ccb->fcrb.ack_delay_avg[index] = 0; 2706 2707 p_ccb->fcrb.throughput[index] = 0; 2708 } 2709 } 2710 #endif 2711 2712 2713 2714
