| /****************************************************************************** |
| * |
| * Copyright (C) 2004-2012 Broadcom Corporation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at: |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| ******************************************************************************/ |
| |
| /****************************************************************************** |
| * |
| * This file contains the L2CAP 1.2 Flow Control and retransmissions |
| * functions |
| * |
| ******************************************************************************/ |
| |
| #include <assert.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "bt_types.h" |
| #include "gki.h" |
| #include "hcimsgs.h" |
| #include "l2c_api.h" |
| #include "l2c_int.h" |
| #include "l2cdefs.h" |
| #include "btm_api.h" |
| #include "btm_int.h" |
| #include "btu.h" |
| |
| /* Flag passed to retransmit_i_frames() when all packets should be retransmitted */ |
| #define L2C_FCR_RETX_ALL_PKTS 0xFF |
| |
| /* this is the minimal offset required by OBX to process incoming packets */ |
| static const uint16_t OBX_BUF_MIN_OFFSET = 4; |
| |
| #if BT_TRACE_VERBOSE == TRUE |
| static char *SAR_types[] = { "Unsegmented", "Start", "End", "Continuation" }; |
| static char *SUP_types[] = { "RR", "REJ", "RNR", "SREJ" }; |
| #endif |
| |
| /* Look-up table for the CRC calculation */ |
| static const unsigned short crctab[256] = { |
| 0x0000, 0xc0c1, 0xc181, 0x0140, 0xc301, 0x03c0, 0x0280, 0xc241, |
| 0xc601, 0x06c0, 0x0780, 0xc741, 0x0500, 0xc5c1, 0xc481, 0x0440, |
| 0xcc01, 0x0cc0, 0x0d80, 0xcd41, 0x0f00, 0xcfc1, 0xce81, 0x0e40, |
| 0x0a00, 0xcac1, 0xcb81, 0x0b40, 0xc901, 0x09c0, 0x0880, 0xc841, |
| 0xd801, 0x18c0, 0x1980, 0xd941, 0x1b00, 0xdbc1, 0xda81, 0x1a40, |
| 0x1e00, 0xdec1, 0xdf81, 0x1f40, 0xdd01, 0x1dc0, 0x1c80, 0xdc41, |
| 0x1400, 0xd4c1, 0xd581, 0x1540, 0xd701, 0x17c0, 0x1680, 0xd641, |
| 0xd201, 0x12c0, 0x1380, 0xd341, 0x1100, 0xd1c1, 0xd081, 0x1040, |
| 0xf001, 0x30c0, 0x3180, 0xf141, 0x3300, 0xf3c1, 0xf281, 0x3240, |
| 0x3600, 0xf6c1, 0xf781, 0x3740, 0xf501, 0x35c0, 0x3480, 0xf441, |
| 0x3c00, 0xfcc1, 0xfd81, 0x3d40, 0xff01, 0x3fc0, 0x3e80, 0xfe41, |
| 0xfa01, 0x3ac0, 0x3b80, 0xfb41, 0x3900, 0xf9c1, 0xf881, 0x3840, |
| 0x2800, 0xe8c1, 0xe981, 0x2940, 0xeb01, 0x2bc0, 0x2a80, 0xea41, |
| 0xee01, 0x2ec0, 0x2f80, 0xef41, 0x2d00, 0xedc1, 0xec81, 0x2c40, |
| 0xe401, 0x24c0, 0x2580, 0xe541, 0x2700, 0xe7c1, 0xe681, 0x2640, |
| 0x2200, 0xe2c1, 0xe381, 0x2340, 0xe101, 0x21c0, 0x2080, 0xe041, |
| 0xa001, 0x60c0, 0x6180, 0xa141, 0x6300, 0xa3c1, 0xa281, 0x6240, |
| 0x6600, 0xa6c1, 0xa781, 0x6740, 0xa501, 0x65c0, 0x6480, 0xa441, |
| 0x6c00, 0xacc1, 0xad81, 0x6d40, 0xaf01, 0x6fc0, 0x6e80, 0xae41, |
| 0xaa01, 0x6ac0, 0x6b80, 0xab41, 0x6900, 0xa9c1, 0xa881, 0x6840, |
| 0x7800, 0xb8c1, 0xb981, 0x7940, 0xbb01, 0x7bc0, 0x7a80, 0xba41, |
| 0xbe01, 0x7ec0, 0x7f80, 0xbf41, 0x7d00, 0xbdc1, 0xbc81, 0x7c40, |
| 0xb401, 0x74c0, 0x7580, 0xb541, 0x7700, 0xb7c1, 0xb681, 0x7640, |
| 0x7200, 0xb2c1, 0xb381, 0x7340, 0xb101, 0x71c0, 0x7080, 0xb041, |
| 0x5000, 0x90c1, 0x9181, 0x5140, 0x9301, 0x53c0, 0x5280, 0x9241, |
| 0x9601, 0x56c0, 0x5780, 0x9741, 0x5500, 0x95c1, 0x9481, 0x5440, |
| 0x9c01, 0x5cc0, 0x5d80, 0x9d41, 0x5f00, 0x9fc1, 0x9e81, 0x5e40, |
| 0x5a00, 0x9ac1, 0x9b81, 0x5b40, 0x9901, 0x59c0, 0x5880, 0x9841, |
| 0x8801, 0x48c0, 0x4980, 0x8941, 0x4b00, 0x8bc1, 0x8a81, 0x4a40, |
| 0x4e00, 0x8ec1, 0x8f81, 0x4f40, 0x8d01, 0x4dc0, 0x4c80, 0x8c41, |
| 0x4400, 0x84c1, 0x8581, 0x4540, 0x8701, 0x47c0, 0x4680, 0x8641, |
| 0x8201, 0x42c0, 0x4380, 0x8341, 0x4100, 0x81c1, 0x8081, 0x4040, |
| }; |
| |
| |
| /******************************************************************************* |
| ** Static local functions |
| */ |
| static BOOLEAN process_reqseq (tL2C_CCB *p_ccb, UINT16 ctrl_word); |
| static void process_s_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word); |
| static void process_i_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word, BOOLEAN delay_ack); |
| static BOOLEAN retransmit_i_frames (tL2C_CCB *p_ccb, UINT8 tx_seq); |
| static void prepare_I_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, BOOLEAN is_retransmission); |
| static void process_stream_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf); |
| static BOOLEAN do_sar_reassembly (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word); |
| |
| #if (L2CAP_ERTM_STATS == TRUE) |
| static void l2c_fcr_collect_ack_delay (tL2C_CCB *p_ccb, UINT8 num_bufs_acked); |
| #endif |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_updcrc |
| ** |
| ** Description This function computes the CRC using the look-up table. |
| ** |
| ** Returns CRC |
| ** |
| *******************************************************************************/ |
| static unsigned short l2c_fcr_updcrc(unsigned short icrc, unsigned char *icp, int icnt) |
| { |
| register unsigned short crc = icrc; |
| register unsigned char *cp = icp; |
| register int cnt = icnt; |
| |
| while (cnt--) |
| { |
| crc = ((crc >> 8) & 0xff) ^ crctab[(crc & 0xff) ^ *cp++]; |
| } |
| |
| return(crc); |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_tx_get_fcs |
| ** |
| ** Description This function computes the CRC for a frame to be TXed. |
| ** |
| ** Returns CRC |
| ** |
| *******************************************************************************/ |
| static UINT16 l2c_fcr_tx_get_fcs (BT_HDR *p_buf) |
| { |
| UINT8 *p = ((UINT8 *) (p_buf + 1)) + p_buf->offset; |
| |
| return (l2c_fcr_updcrc (L2CAP_FCR_INIT_CRC, p, p_buf->len)); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_rx_get_fcs |
| ** |
| ** Description This function computes the CRC for a received frame. |
| ** |
| ** Returns CRC |
| ** |
| *******************************************************************************/ |
| static UINT16 l2c_fcr_rx_get_fcs (BT_HDR *p_buf) |
| { |
| UINT8 *p = ((UINT8 *) (p_buf + 1)) + p_buf->offset; |
| |
| /* offset points past the L2CAP header, but the CRC check includes it */ |
| p -= L2CAP_PKT_OVERHEAD; |
| |
| return (l2c_fcr_updcrc (L2CAP_FCR_INIT_CRC, p, p_buf->len + L2CAP_PKT_OVERHEAD)); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_start_timer |
| ** |
| ** Description This function starts the (monitor or retransmission) timer. |
| ** |
| ** Returns - |
| ** |
| *******************************************************************************/ |
| void l2c_fcr_start_timer (tL2C_CCB *p_ccb) |
| { |
| assert(p_ccb != NULL); |
| UINT32 tout; |
| |
| /* The timers which are in milliseconds */ |
| if (p_ccb->fcrb.wait_ack) |
| { |
| tout = (UINT32)p_ccb->our_cfg.fcr.mon_tout; |
| } |
| else |
| { |
| tout = (UINT32)p_ccb->our_cfg.fcr.rtrans_tout; |
| } |
| |
| /* Only start a timer that was not started */ |
| if (p_ccb->fcrb.mon_retrans_timer.in_use == 0) |
| btu_start_quick_timer (&p_ccb->fcrb.mon_retrans_timer, BTU_TTYPE_L2CAP_CHNL, tout*QUICK_TIMER_TICKS_PER_SEC/1000); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_stop_timer |
| ** |
| ** Description This function stops the (monitor or transmission) timer. |
| ** |
| ** Returns - |
| ** |
| *******************************************************************************/ |
| void l2c_fcr_stop_timer (tL2C_CCB *p_ccb) |
| { |
| assert(p_ccb != NULL); |
| if (p_ccb->fcrb.mon_retrans_timer.in_use) |
| { |
| btu_stop_quick_timer (&p_ccb->fcrb.mon_retrans_timer); |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_cleanup |
| ** |
| ** Description This function cleans up the variable used for flow-control/retrans. |
| ** |
| ** Returns - |
| ** |
| *******************************************************************************/ |
| void l2c_fcr_cleanup (tL2C_CCB *p_ccb) |
| { |
| assert(p_ccb != NULL); |
| tL2C_FCRB *p_fcrb = &p_ccb->fcrb; |
| |
| l2c_fcr_stop_timer (p_ccb); |
| |
| if (p_fcrb->p_rx_sdu) |
| GKI_freebuf (p_fcrb->p_rx_sdu); |
| |
| while (!GKI_queue_is_empty(&p_fcrb->waiting_for_ack_q)) |
| GKI_freebuf (GKI_dequeue (&p_fcrb->waiting_for_ack_q)); |
| |
| while (!GKI_queue_is_empty(&p_fcrb->srej_rcv_hold_q)) |
| GKI_freebuf (GKI_dequeue (&p_fcrb->srej_rcv_hold_q)); |
| |
| while (!GKI_queue_is_empty(&p_fcrb->retrans_q)) |
| GKI_freebuf (GKI_dequeue (&p_fcrb->retrans_q)); |
| |
| btu_stop_quick_timer (&p_fcrb->ack_timer); |
| btu_stop_quick_timer (&p_ccb->fcrb.mon_retrans_timer); |
| |
| #if (L2CAP_ERTM_STATS == TRUE) |
| if ( (p_ccb->local_cid >= L2CAP_BASE_APPL_CID) && (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) ) |
| { |
| UINT32 dur = time_get_os_boottime_ms() - p_ccb->fcrb.connect_tick_count; |
| char *p_str = (char *)GKI_getbuf(120); |
| UINT16 i; |
| UINT32 throughput_avg, ack_delay_avg, ack_q_count_avg; |
| |
| BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, |
| "--- L2CAP ERTM Stats for CID: 0x%04x Duration: %08ums", p_ccb->local_cid, dur); |
| BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, |
| "Retransmissions:%08u Times Flow Controlled:%08u Retrans Touts:%08u Ack Touts:%08u", |
| p_ccb->fcrb.pkts_retransmitted, p_ccb->fcrb.xmit_window_closed, p_ccb->fcrb.retrans_touts, p_ccb->fcrb.xmit_ack_touts); |
| BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, |
| "Times there is less than 2 packets in controller when flow controlled:%08u", p_ccb->fcrb.controller_idle); |
| BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, |
| "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 ); |
| if (p_str) |
| { |
| sprintf(p_str, "Sent Pkts:%08u Bytes:%10u(%06u/sec) RR:%08u REJ:%08u RNR:%08u SREJ:%08u", |
| p_ccb->fcrb.ertm_pkt_counts[0], p_ccb->fcrb.ertm_byte_counts[0], |
| (dur >= 10 ? (p_ccb->fcrb.ertm_byte_counts[0] * 100) / (dur / 10) : 0), |
| 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]); |
| |
| BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", p_str); |
| |
| sprintf(p_str, "Rcvd Pkts:%08u Bytes:%10u(%06u/sec) RR:%08u REJ:%08u RNR:%08u SREJ:%08u", |
| p_ccb->fcrb.ertm_pkt_counts[1], p_ccb->fcrb.ertm_byte_counts[1], |
| (dur >= 10 ? (p_ccb->fcrb.ertm_byte_counts[1] * 100) / (dur / 10) : 0), |
| 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]); |
| |
| BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", p_str); |
| |
| throughput_avg = 0; |
| ack_delay_avg = 0; |
| ack_q_count_avg = 0; |
| |
| for (i = 0; i < L2CAP_ERTM_STATS_NUM_AVG; i++ ) |
| { |
| if (i == p_ccb->fcrb.ack_delay_avg_index ) |
| { |
| BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, |
| "[%02u] collecting data ...", i ); |
| continue; |
| } |
| |
| sprintf(p_str, "[%02u] throughput: %5u, ack_delay avg:%3u, min:%3u, max:%3u, ack_q_count avg:%3u, min:%3u, max:%3u", |
| i, p_ccb->fcrb.throughput[i], |
| p_ccb->fcrb.ack_delay_avg[i], p_ccb->fcrb.ack_delay_min[i], p_ccb->fcrb.ack_delay_max[i], |
| p_ccb->fcrb.ack_q_count_avg[i], p_ccb->fcrb.ack_q_count_min[i], p_ccb->fcrb.ack_q_count_max[i] ); |
| |
| BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", p_str); |
| |
| throughput_avg += p_ccb->fcrb.throughput[i]; |
| ack_delay_avg += p_ccb->fcrb.ack_delay_avg[i]; |
| ack_q_count_avg += p_ccb->fcrb.ack_q_count_avg[i]; |
| } |
| |
| throughput_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1); |
| ack_delay_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1); |
| ack_q_count_avg /= (L2CAP_ERTM_STATS_NUM_AVG - 1); |
| |
| BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, |
| "throughput_avg: %8u (kbytes/sec), ack_delay_avg: %8u ms, ack_q_count_avg: %8u", |
| throughput_avg, ack_delay_avg, ack_q_count_avg ); |
| |
| GKI_freebuf(p_str); |
| } |
| |
| BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, |
| "---"); |
| } |
| #endif |
| |
| memset (p_fcrb, 0, sizeof (tL2C_FCRB)); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_clone_buf |
| ** |
| ** Description This function allocates and copies requested part of a buffer |
| ** at a new-offset. |
| ** |
| ** Returns pointer to new buffer |
| ** |
| *******************************************************************************/ |
| BT_HDR *l2c_fcr_clone_buf(BT_HDR *p_buf, UINT16 new_offset, UINT16 no_of_bytes) |
| { |
| assert(p_buf != NULL); |
| uint16_t buf_size = no_of_bytes + sizeof(BT_HDR) + new_offset; |
| BT_HDR *p_buf2 = (BT_HDR *)GKI_getbuf(buf_size); |
| |
| if (p_buf2 != NULL) |
| { |
| p_buf2->offset = new_offset; |
| p_buf2->len = no_of_bytes; |
| |
| memcpy (((UINT8 *)(p_buf2 + 1)) + p_buf2->offset, |
| ((UINT8 *)(p_buf + 1)) + p_buf->offset, |
| no_of_bytes); |
| } |
| else |
| { |
| L2CAP_TRACE_ERROR("L2CAP - failed to clone buffer, Size: %u", |
| buf_size); |
| } |
| |
| return (p_buf2); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_is_flow_controlled |
| ** |
| ** Description This function checks if the CCB is flow controlled by peer. |
| ** |
| ** Returns The control word |
| ** |
| *******************************************************************************/ |
| BOOLEAN l2c_fcr_is_flow_controlled (tL2C_CCB *p_ccb) |
| { |
| assert(p_ccb != NULL); |
| if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) |
| { |
| /* Check if remote side flowed us off or the transmit window is full */ |
| if ( (p_ccb->fcrb.remote_busy == TRUE) |
| || (GKI_queue_length(&p_ccb->fcrb.waiting_for_ack_q) >= p_ccb->peer_cfg.fcr.tx_win_sz) ) |
| { |
| #if (L2CAP_ERTM_STATS == TRUE) |
| if (!GKI_queue_is_empty(&p_ccb->xmit_hold_q)) |
| { |
| p_ccb->fcrb.xmit_window_closed++; |
| |
| if ((p_ccb->p_lcb->sent_not_acked < 2)&&(l2cb.controller_xmit_window > 0)) |
| p_ccb->fcrb.controller_idle++; |
| } |
| #endif |
| return (TRUE); |
| } |
| } |
| return (FALSE); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function prepare_I_frame |
| ** |
| ** Description This function sets the FCR variables in an I-frame that is |
| ** about to be sent to HCI for transmission. This may be the |
| ** first time the I-frame is sent, or a retransmission |
| ** |
| ** Returns - |
| ** |
| *******************************************************************************/ |
| static void prepare_I_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, BOOLEAN is_retransmission) |
| { |
| assert(p_ccb != NULL); |
| assert(p_buf != NULL); |
| tL2C_FCRB *p_fcrb = &p_ccb->fcrb; |
| UINT8 *p; |
| UINT16 fcs; |
| UINT16 ctrl_word; |
| BOOLEAN set_f_bit = p_fcrb->send_f_rsp; |
| |
| p_fcrb->send_f_rsp = FALSE; |
| |
| if (is_retransmission) |
| { |
| /* Get the old control word and clear out the old req_seq and F bits */ |
| p = ((UINT8 *) (p_buf+1)) + p_buf->offset + L2CAP_PKT_OVERHEAD; |
| |
| STREAM_TO_UINT16 (ctrl_word, p); |
| |
| ctrl_word &= ~(L2CAP_FCR_REQ_SEQ_BITS + L2CAP_FCR_F_BIT); |
| } |
| else |
| { |
| ctrl_word = p_buf->layer_specific & L2CAP_FCR_SEG_BITS; /* SAR bits */ |
| ctrl_word |= (p_fcrb->next_tx_seq << L2CAP_FCR_TX_SEQ_BITS_SHIFT); /* Tx Seq */ |
| |
| p_fcrb->next_tx_seq = (p_fcrb->next_tx_seq + 1) & L2CAP_FCR_SEQ_MODULO; |
| } |
| |
| /* Set the F-bit and reqseq only if using re-transmission mode */ |
| if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) |
| { |
| if (set_f_bit) |
| ctrl_word |= L2CAP_FCR_F_BIT; |
| |
| ctrl_word |= (p_fcrb->next_seq_expected) << L2CAP_FCR_REQ_SEQ_BITS_SHIFT; |
| |
| p_fcrb->last_ack_sent = p_ccb->fcrb.next_seq_expected; |
| |
| if (p_ccb->fcrb.ack_timer.in_use) |
| btu_stop_quick_timer (&p_ccb->fcrb.ack_timer); |
| } |
| |
| /* Set the control word */ |
| p = ((UINT8 *) (p_buf+1)) + p_buf->offset + L2CAP_PKT_OVERHEAD; |
| |
| UINT16_TO_STREAM (p, ctrl_word); |
| |
| /* Compute the FCS and add to the end of the buffer if not bypassed */ |
| if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) |
| { |
| /* length field in l2cap header has to include FCS length */ |
| p = ((UINT8 *) (p_buf+1)) + p_buf->offset; |
| UINT16_TO_STREAM (p, p_buf->len + L2CAP_FCS_LEN - L2CAP_PKT_OVERHEAD); |
| |
| /* Calculate the FCS */ |
| fcs = l2c_fcr_tx_get_fcs(p_buf); |
| |
| /* Point to the end of the buffer and put the FCS there */ |
| p = ((UINT8 *) (p_buf+1)) + p_buf->offset + p_buf->len; |
| |
| UINT16_TO_STREAM (p, fcs); |
| |
| p_buf->len += L2CAP_FCS_LEN; |
| } |
| |
| #if BT_TRACE_VERBOSE == TRUE |
| if (is_retransmission) |
| { |
| L2CAP_TRACE_EVENT ("L2CAP eRTM ReTx I-frame CID: 0x%04x Len: %u SAR: %s TxSeq: %u ReqSeq: %u F: %u", |
| p_ccb->local_cid, p_buf->len, |
| SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT], |
| (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT, |
| (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, |
| (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); |
| } |
| else |
| { |
| L2CAP_TRACE_EVENT ("L2CAP eRTM Tx I-frame CID: 0x%04x Len: %u SAR: %-12s TxSeq: %u ReqSeq: %u F: %u", |
| p_ccb->local_cid, p_buf->len, |
| SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT], |
| (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT, |
| (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, |
| (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); |
| } |
| #endif |
| |
| /* Start the retransmission timer if not already running */ |
| if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) |
| l2c_fcr_start_timer (p_ccb); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_send_S_frame |
| ** |
| ** Description This function formats and sends an S-frame for transmission. |
| ** |
| ** Returns - |
| ** |
| *******************************************************************************/ |
| void l2c_fcr_send_S_frame (tL2C_CCB *p_ccb, UINT16 function_code, UINT16 pf_bit) |
| { |
| assert(p_ccb != NULL); |
| BT_HDR *p_buf; |
| UINT8 *p; |
| UINT16 ctrl_word; |
| UINT16 fcs; |
| |
| if ((!p_ccb->in_use) || (p_ccb->chnl_state != CST_OPEN)) |
| return; |
| |
| #if (L2CAP_ERTM_STATS == TRUE) |
| p_ccb->fcrb.s_frames_sent[function_code]++; |
| #endif |
| |
| if (pf_bit == L2CAP_FCR_P_BIT) |
| { |
| p_ccb->fcrb.wait_ack = TRUE; |
| |
| l2c_fcr_stop_timer (p_ccb); /* Restart the monitor timer */ |
| l2c_fcr_start_timer (p_ccb); |
| } |
| |
| /* Create the control word to use */ |
| ctrl_word = (function_code << L2CAP_FCR_SUP_SHIFT) | L2CAP_FCR_S_FRAME_BIT; |
| ctrl_word |= (p_ccb->fcrb.next_seq_expected << L2CAP_FCR_REQ_SEQ_BITS_SHIFT); |
| ctrl_word |= pf_bit; |
| |
| p_buf = (BT_HDR *)GKI_getbuf(L2CAP_CMD_BUF_SIZE); |
| if (p_buf != NULL) |
| { |
| p_buf->offset = HCI_DATA_PREAMBLE_SIZE; |
| p_buf->len = L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD; |
| |
| /* Set the pointer to the beginning of the data */ |
| p = (UINT8 *)(p_buf + 1) + p_buf->offset; |
| |
| /* Put in the L2CAP header */ |
| UINT16_TO_STREAM (p, L2CAP_FCR_OVERHEAD + L2CAP_FCS_LEN); |
| UINT16_TO_STREAM (p, p_ccb->remote_cid); |
| UINT16_TO_STREAM (p, ctrl_word); |
| |
| /* Compute the FCS and add to the end of the buffer if not bypassed */ |
| if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) |
| { |
| fcs = l2c_fcr_tx_get_fcs (p_buf); |
| |
| UINT16_TO_STREAM (p, fcs); |
| p_buf->len += L2CAP_FCS_LEN; |
| } |
| else /* rewrite the length without FCS length */ |
| { |
| p -= 6; |
| UINT16_TO_STREAM (p, L2CAP_FCR_OVERHEAD); |
| } |
| |
| /* Now, the HCI transport header */ |
| p_buf->layer_specific = L2CAP_NON_FLUSHABLE_PKT; |
| l2cu_set_acl_hci_header (p_buf, p_ccb); |
| |
| #if BT_TRACE_VERBOSE == TRUE |
| if ((((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 1) |
| || (((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 3)) |
| { |
| L2CAP_TRACE_WARNING ("L2CAP eRTM Tx S-frame CID: 0x%04x ctrlword: 0x%04x Type: %s ReqSeq: %u P: %u F: %u", |
| p_ccb->local_cid, ctrl_word, |
| SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT], |
| (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, |
| (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT, |
| (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); |
| L2CAP_TRACE_WARNING (" Buf Len: %u", p_buf->len); |
| } |
| else |
| { |
| L2CAP_TRACE_EVENT ("L2CAP eRTM Tx S-frame CID: 0x%04x ctrlword: 0x%04x Type: %s ReqSeq: %u P: %u F: %u", |
| p_ccb->local_cid, ctrl_word, |
| SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT], |
| (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, |
| (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT, |
| (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); |
| L2CAP_TRACE_EVENT (" Buf Len: %u", p_buf->len); |
| } |
| #endif /* BT_TRACE_VERBOSE */ |
| |
| l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, p_buf); |
| |
| p_ccb->fcrb.last_ack_sent = p_ccb->fcrb.next_seq_expected; |
| |
| if (p_ccb->fcrb.ack_timer.in_use) |
| btu_stop_quick_timer (&p_ccb->fcrb.ack_timer); |
| } |
| else |
| { |
| L2CAP_TRACE_ERROR ("l2c_fcr_send_S_frame(No Resources) cid 0x%04x, Type: 0x%4x", |
| p_ccb->local_cid, function_code); |
| } |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_proc_pdu |
| ** |
| ** Description This function is the entry point for processing of a |
| ** received PDU when in flow control and/or retransmission modes. |
| ** |
| ** Returns - |
| ** |
| *******************************************************************************/ |
| void l2c_fcr_proc_pdu (tL2C_CCB *p_ccb, BT_HDR *p_buf) |
| { |
| assert(p_ccb != NULL); |
| assert(p_buf != NULL); |
| UINT8 *p; |
| UINT16 fcs; |
| UINT16 min_pdu_len; |
| UINT16 ctrl_word; |
| |
| /* Check the length */ |
| min_pdu_len = (p_ccb->bypass_fcs == L2CAP_BYPASS_FCS) ? |
| (UINT16)L2CAP_FCR_OVERHEAD : (UINT16)(L2CAP_FCS_LEN + L2CAP_FCR_OVERHEAD); |
| |
| if (p_buf->len < min_pdu_len) |
| { |
| L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x Len too short: %u", p_ccb->local_cid, p_buf->len); |
| GKI_freebuf (p_buf); |
| return; |
| } |
| |
| if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_STREAM_MODE) |
| { |
| process_stream_frame (p_ccb, p_buf); |
| return; |
| } |
| |
| #if BT_TRACE_VERBOSE == TRUE |
| /* Get the control word */ |
| p = ((UINT8 *)(p_buf+1)) + p_buf->offset; |
| STREAM_TO_UINT16 (ctrl_word, p); |
| |
| if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) |
| { |
| if ((((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 1) |
| || (((ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT) == 3)) |
| { |
| /* REJ or SREJ */ |
| L2CAP_TRACE_WARNING ("L2CAP eRTM Rx S-frame: cid: 0x%04x Len: %u Type: %s ReqSeq: %u P: %u F: %u", |
| p_ccb->local_cid, p_buf->len, |
| SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT], |
| (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, |
| (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT, |
| (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); |
| } |
| else |
| { |
| L2CAP_TRACE_EVENT ("L2CAP eRTM Rx S-frame: cid: 0x%04x Len: %u Type: %s ReqSeq: %u P: %u F: %u", |
| p_ccb->local_cid, p_buf->len, |
| SUP_types[(ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT], |
| (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, |
| (ctrl_word & L2CAP_FCR_P_BIT) >> L2CAP_FCR_P_BIT_SHIFT, |
| (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); |
| } |
| } |
| else |
| { |
| L2CAP_TRACE_EVENT ("L2CAP eRTM Rx I-frame: cid: 0x%04x Len: %u SAR: %-12s TxSeq: %u ReqSeq: %u F: %u", |
| p_ccb->local_cid, p_buf->len, |
| SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT], |
| (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT, |
| (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, |
| (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); |
| } |
| |
| 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", |
| p_ccb->fcrb.next_tx_seq, p_ccb->fcrb.last_rx_ack, p_ccb->fcrb.next_seq_expected, |
| p_ccb->fcrb.last_ack_sent, GKI_queue_length(&p_ccb->fcrb.waiting_for_ack_q), p_ccb->fcrb.num_tries); |
| |
| #endif /* BT_TRACE_VERBOSE */ |
| |
| /* Verify FCS if using */ |
| if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) |
| { |
| p = ((UINT8 *)(p_buf+1)) + p_buf->offset + p_buf->len - L2CAP_FCS_LEN; |
| |
| /* Extract and drop the FCS from the packet */ |
| STREAM_TO_UINT16 (fcs, p); |
| p_buf->len -= L2CAP_FCS_LEN; |
| |
| if (l2c_fcr_rx_get_fcs(p_buf) != fcs) |
| { |
| L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x BAD FCS", p_ccb->local_cid); |
| GKI_freebuf(p_buf); |
| return; |
| } |
| } |
| |
| /* Get the control word */ |
| p = ((UINT8 *)(p_buf+1)) + p_buf->offset; |
| |
| STREAM_TO_UINT16 (ctrl_word, p); |
| |
| p_buf->len -= L2CAP_FCR_OVERHEAD; |
| p_buf->offset += L2CAP_FCR_OVERHEAD; |
| |
| /* If we had a poll bit outstanding, check if we got a final response */ |
| if (p_ccb->fcrb.wait_ack) |
| { |
| /* If final bit not set, ignore the frame unless it is a polled S-frame */ |
| if ( !(ctrl_word & L2CAP_FCR_F_BIT) ) |
| { |
| if ( (ctrl_word & L2CAP_FCR_P_BIT) && (ctrl_word & L2CAP_FCR_S_FRAME_BIT) ) |
| { |
| if (p_ccb->fcrb.srej_sent) |
| l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_SREJ, L2CAP_FCR_F_BIT); |
| else if (p_ccb->fcrb.local_busy) |
| l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_F_BIT); |
| else |
| l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_F_BIT); |
| |
| /* Got a poll while in wait_ack state, so re-start our timer with 1-second */ |
| /* This is a small optimization... the monitor timer is 12 secs, but we saw */ |
| /* that if the other side sends us a poll when we are waiting for a final, */ |
| /* then it speeds up recovery significantly if we poll him back soon after his poll. */ |
| btu_start_quick_timer (&p_ccb->fcrb.mon_retrans_timer, BTU_TTYPE_L2CAP_CHNL, QUICK_TIMER_TICKS_PER_SEC); |
| } |
| GKI_freebuf (p_buf); |
| return; |
| } |
| |
| p_ccb->fcrb.wait_ack = FALSE; |
| |
| /* P and F are mutually exclusive */ |
| if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) |
| ctrl_word &= ~L2CAP_FCR_P_BIT; |
| |
| if (GKI_queue_is_empty(&p_ccb->fcrb.waiting_for_ack_q)) |
| p_ccb->fcrb.num_tries = 0; |
| |
| l2c_fcr_stop_timer (p_ccb); |
| } |
| else |
| { |
| /* Otherwise, ensure the final bit is ignored */ |
| ctrl_word &= ~L2CAP_FCR_F_BIT; |
| } |
| |
| /* Process receive sequence number */ |
| if (!process_reqseq (p_ccb, ctrl_word)) |
| { |
| GKI_freebuf (p_buf); |
| return; |
| } |
| |
| /* Process based on whether it is an S-frame or an I-frame */ |
| if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) |
| process_s_frame (p_ccb, p_buf, ctrl_word); |
| else |
| process_i_frame (p_ccb, p_buf, ctrl_word, FALSE); |
| |
| /* Return if the channel got disconnected by a bad packet or max retransmissions */ |
| if ( (!p_ccb->in_use) || (p_ccb->chnl_state != CST_OPEN) ) |
| return; |
| |
| /* If we have some buffers held while doing SREJ, and SREJ has cleared, process them now */ |
| if ( (!p_ccb->fcrb.local_busy) && (!p_ccb->fcrb.srej_sent) && (!GKI_queue_is_empty(&p_ccb->fcrb.srej_rcv_hold_q))) |
| { |
| BUFFER_Q temp_q = p_ccb->fcrb.srej_rcv_hold_q; |
| |
| GKI_init_q (&p_ccb->fcrb.srej_rcv_hold_q); |
| |
| while ((p_buf = (BT_HDR *)GKI_dequeue (&temp_q)) != NULL) |
| { |
| if (p_ccb->in_use && (p_ccb->chnl_state == CST_OPEN)) |
| { |
| /* Get the control word */ |
| p = ((UINT8 *)(p_buf+1)) + p_buf->offset - L2CAP_FCR_OVERHEAD; |
| |
| STREAM_TO_UINT16 (ctrl_word, p); |
| |
| L2CAP_TRACE_DEBUG ("l2c_fcr_proc_pdu() CID: 0x%04x Process Buffer from SREJ_Hold_Q TxSeq: %u Expected_Seq: %u", |
| p_ccb->local_cid, (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT, |
| p_ccb->fcrb.next_seq_expected); |
| |
| /* Process the SREJ held I-frame, but do not send an RR for each individual frame */ |
| process_i_frame (p_ccb, p_buf, ctrl_word, TRUE); |
| } |
| else |
| GKI_freebuf (p_buf); |
| |
| /* If more frames were lost during SREJ, send a REJ */ |
| if (p_ccb->fcrb.rej_after_srej) |
| { |
| p_ccb->fcrb.rej_after_srej = FALSE; |
| p_ccb->fcrb.rej_sent = TRUE; |
| |
| l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_REJ, 0); |
| } |
| } |
| |
| /* Now, if needed, send one RR for the whole held queue */ |
| if ( (!p_ccb->fcrb.local_busy) && (!p_ccb->fcrb.rej_sent) && (!p_ccb->fcrb.srej_sent) |
| && (p_ccb->fcrb.next_seq_expected != p_ccb->fcrb.last_ack_sent) ) |
| l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, 0); |
| else |
| { |
| 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", |
| 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, |
| p_ccb->fcrb.last_ack_sent); |
| } |
| } |
| |
| /* If a window has opened, check if we can send any more packets */ |
| if ( (!GKI_queue_is_empty(&p_ccb->fcrb.retrans_q) || !GKI_queue_is_empty(&p_ccb->xmit_hold_q)) |
| && (p_ccb->fcrb.wait_ack == FALSE) |
| && (l2c_fcr_is_flow_controlled (p_ccb) == FALSE) ) |
| { |
| l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, NULL); |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_proc_tout |
| ** |
| ** Description Handle a timeout. We should be in error recovery state. |
| ** |
| ** Returns - |
| ** |
| *******************************************************************************/ |
| void l2c_fcr_proc_tout (tL2C_CCB *p_ccb) |
| { |
| assert(p_ccb != NULL); |
| L2CAP_TRACE_DEBUG ("l2c_fcr_proc_tout: CID: 0x%04x num_tries: %u (max: %u) wait_ack: %u ack_q_count: %u", |
| p_ccb->local_cid, p_ccb->fcrb.num_tries, p_ccb->peer_cfg.fcr.max_transmit, |
| p_ccb->fcrb.wait_ack, GKI_queue_length(&p_ccb->fcrb.waiting_for_ack_q)); |
| |
| #if (L2CAP_ERTM_STATS == TRUE) |
| p_ccb->fcrb.retrans_touts++; |
| #endif |
| |
| if ( (p_ccb->peer_cfg.fcr.max_transmit != 0) && (++p_ccb->fcrb.num_tries > p_ccb->peer_cfg.fcr.max_transmit) ) |
| { |
| l2cu_disconnect_chnl (p_ccb); |
| } |
| else |
| { |
| if (!p_ccb->fcrb.srej_sent && !p_ccb->fcrb.rej_sent) |
| { |
| if (p_ccb->fcrb.local_busy) |
| l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_P_BIT); |
| else |
| l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_P_BIT); |
| } |
| } |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_proc_ack_tout |
| ** |
| ** Description Send RR/RNR if we have not acked I frame |
| ** |
| ** Returns - |
| ** |
| *******************************************************************************/ |
| void l2c_fcr_proc_ack_tout (tL2C_CCB *p_ccb) |
| { |
| assert(p_ccb != NULL); |
| L2CAP_TRACE_DEBUG ("l2c_fcr_proc_ack_tout: CID: 0x%04x State: %u Wack:%u Rq:%d Acked:%d", p_ccb->local_cid, |
| p_ccb->chnl_state, p_ccb->fcrb.wait_ack, p_ccb->fcrb.next_seq_expected, p_ccb->fcrb.last_ack_sent); |
| |
| if ( (p_ccb->chnl_state == CST_OPEN) && (!p_ccb->fcrb.wait_ack) |
| && (p_ccb->fcrb.last_ack_sent != p_ccb->fcrb.next_seq_expected) ) |
| { |
| #if (L2CAP_ERTM_STATS == TRUE) |
| p_ccb->fcrb.xmit_ack_touts++; |
| #endif |
| if (p_ccb->fcrb.local_busy) |
| l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, 0); |
| else |
| l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, 0); |
| } |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function process_reqseq |
| ** |
| ** Description Handle receive sequence number |
| ** |
| ** Returns - |
| ** |
| *******************************************************************************/ |
| static BOOLEAN process_reqseq (tL2C_CCB *p_ccb, UINT16 ctrl_word) |
| { |
| assert(p_ccb != NULL); |
| tL2C_FCRB *p_fcrb = &p_ccb->fcrb; |
| UINT8 req_seq, num_bufs_acked, xx; |
| UINT16 ls; |
| UINT16 full_sdus_xmitted; |
| |
| /* Receive sequence number does not ack anything for SREJ with P-bit set to zero */ |
| if ( (ctrl_word & L2CAP_FCR_S_FRAME_BIT) |
| && ((ctrl_word & L2CAP_FCR_SUP_BITS) == (L2CAP_FCR_SUP_SREJ << L2CAP_FCR_SUP_SHIFT)) |
| && ((ctrl_word & L2CAP_FCR_P_BIT) == 0) ) |
| { |
| /* If anything still waiting for ack, restart the timer if it was stopped */ |
| if (!GKI_queue_is_empty(&p_fcrb->waiting_for_ack_q)) |
| l2c_fcr_start_timer (p_ccb); |
| |
| return (TRUE); |
| } |
| |
| /* Extract the receive sequence number from the control word */ |
| req_seq = (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT; |
| |
| num_bufs_acked = (req_seq - p_fcrb->last_rx_ack) & L2CAP_FCR_SEQ_MODULO; |
| |
| /* Verify the request sequence is in range before proceeding */ |
| if (num_bufs_acked > GKI_queue_length(&p_fcrb->waiting_for_ack_q)) |
| { |
| /* The channel is closed if ReqSeq is not in range */ |
| L2CAP_TRACE_WARNING ("L2CAP eRTM Frame BAD Req_Seq - ctrl_word: 0x%04x req_seq 0x%02x last_rx_ack: 0x%02x QCount: %u", |
| ctrl_word, req_seq, p_fcrb->last_rx_ack, GKI_queue_length(&p_fcrb->waiting_for_ack_q)); |
| |
| l2cu_disconnect_chnl (p_ccb); |
| return (FALSE); |
| } |
| |
| p_fcrb->last_rx_ack = req_seq; |
| |
| /* Now we can release all acknowledged frames, and restart the retransmission timer if needed */ |
| if (num_bufs_acked != 0) |
| { |
| p_fcrb->num_tries = 0; |
| full_sdus_xmitted = 0; |
| |
| #if (L2CAP_ERTM_STATS == TRUE) |
| l2c_fcr_collect_ack_delay (p_ccb, num_bufs_acked); |
| #endif |
| |
| for (xx = 0; xx < num_bufs_acked; xx++) |
| { |
| ls = ((BT_HDR *)(GKI_getfirst(&p_fcrb->waiting_for_ack_q)))->layer_specific & L2CAP_FCR_SAR_BITS; |
| |
| if ( (ls == L2CAP_FCR_UNSEG_SDU) || (ls == L2CAP_FCR_END_SDU) ) |
| full_sdus_xmitted++; |
| |
| GKI_freebuf (GKI_dequeue (&p_fcrb->waiting_for_ack_q)); |
| } |
| |
| /* If we are still in a wait_ack state, do not mess with the timer */ |
| if (!p_ccb->fcrb.wait_ack) |
| l2c_fcr_stop_timer (p_ccb); |
| |
| /* Check if we need to call the "packet_sent" callback */ |
| if ( (p_ccb->p_rcb) && (p_ccb->p_rcb->api.pL2CA_TxComplete_Cb) && (full_sdus_xmitted) ) |
| { |
| /* Special case for eRTM, if all packets sent, send 0xFFFF */ |
| if (GKI_queue_is_empty(&p_fcrb->waiting_for_ack_q) && (GKI_queue_is_empty(&p_ccb->xmit_hold_q))) |
| full_sdus_xmitted = 0xFFFF; |
| |
| (*p_ccb->p_rcb->api.pL2CA_TxComplete_Cb)(p_ccb->local_cid, full_sdus_xmitted); |
| } |
| } |
| |
| /* If anything still waiting for ack, restart the timer if it was stopped */ |
| if (!GKI_queue_is_empty(&p_fcrb->waiting_for_ack_q)) |
| l2c_fcr_start_timer (p_ccb); |
| |
| return (TRUE); |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function process_s_frame |
| ** |
| ** Description Process an S frame |
| ** |
| ** Returns - |
| ** |
| *******************************************************************************/ |
| static void process_s_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word) |
| { |
| assert(p_ccb != NULL); |
| assert(p_buf != NULL); |
| |
| tL2C_FCRB *p_fcrb = &p_ccb->fcrb; |
| UINT16 s_frame_type = (ctrl_word & L2CAP_FCR_SUP_BITS) >> L2CAP_FCR_SUP_SHIFT; |
| BOOLEAN remote_was_busy; |
| BOOLEAN all_ok = TRUE; |
| |
| if (p_buf->len != 0) |
| { |
| L2CAP_TRACE_WARNING ("Incorrect S-frame Length (%d)", p_buf->len); |
| } |
| |
| L2CAP_TRACE_DEBUG ("process_s_frame ctrl_word 0x%04x fcrb_remote_busy:%d", ctrl_word, p_fcrb->remote_busy); |
| |
| #if (L2CAP_ERTM_STATS == TRUE) |
| p_ccb->fcrb.s_frames_rcvd[s_frame_type]++; |
| #endif |
| |
| if (ctrl_word & L2CAP_FCR_P_BIT) |
| { |
| p_fcrb->rej_sent = FALSE; /* After checkpoint, we can send anoher REJ */ |
| p_fcrb->send_f_rsp = TRUE; /* Set a flag in case an I-frame is pending */ |
| } |
| |
| switch (s_frame_type) |
| { |
| case L2CAP_FCR_SUP_RR: |
| remote_was_busy = p_fcrb->remote_busy; |
| p_fcrb->remote_busy = FALSE; |
| |
| if ( (ctrl_word & L2CAP_FCR_F_BIT) || (remote_was_busy) ) |
| all_ok = retransmit_i_frames (p_ccb, L2C_FCR_RETX_ALL_PKTS); |
| break; |
| |
| case L2CAP_FCR_SUP_REJ: |
| p_fcrb->remote_busy = FALSE; |
| all_ok = retransmit_i_frames (p_ccb, L2C_FCR_RETX_ALL_PKTS); |
| break; |
| |
| case L2CAP_FCR_SUP_RNR: |
| p_fcrb->remote_busy = TRUE; |
| l2c_fcr_stop_timer (p_ccb); |
| break; |
| |
| case L2CAP_FCR_SUP_SREJ: |
| p_fcrb->remote_busy = FALSE; |
| all_ok = retransmit_i_frames (p_ccb, (UINT8)((ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT)); |
| break; |
| } |
| |
| if (all_ok) |
| { |
| /* If polled, we need to respond with F-bit. Note, we may have sent a I-frame with the F-bit */ |
| if (p_fcrb->send_f_rsp) |
| { |
| if (p_fcrb->srej_sent) |
| l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_SREJ, L2CAP_FCR_F_BIT); |
| else if (p_fcrb->local_busy) |
| l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, L2CAP_FCR_F_BIT); |
| else |
| l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_F_BIT); |
| |
| p_fcrb->send_f_rsp = FALSE; |
| } |
| } |
| else |
| { |
| L2CAP_TRACE_DEBUG ("process_s_frame hit_max_retries"); |
| } |
| |
| GKI_freebuf (p_buf); |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function process_i_frame |
| ** |
| ** Description Process an I frame |
| ** |
| ** Returns - |
| ** |
| *******************************************************************************/ |
| static void process_i_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word, BOOLEAN delay_ack) |
| { |
| assert(p_ccb != NULL); |
| assert(p_buf != NULL); |
| |
| tL2C_FCRB *p_fcrb = &p_ccb->fcrb; |
| UINT8 tx_seq, num_lost, num_to_ack, next_srej; |
| |
| /* If we were doing checkpoint recovery, first retransmit all unacked I-frames */ |
| if (ctrl_word & L2CAP_FCR_F_BIT) |
| { |
| if (!retransmit_i_frames (p_ccb, L2C_FCR_RETX_ALL_PKTS)) |
| { |
| GKI_freebuf(p_buf); |
| return; |
| } |
| } |
| |
| #if (L2CAP_ERTM_STATS == TRUE) |
| p_ccb->fcrb.ertm_pkt_counts[1]++; |
| p_ccb->fcrb.ertm_byte_counts[1] += p_buf->len; |
| #endif |
| |
| /* Extract the sequence number */ |
| tx_seq = (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT; |
| |
| /* If we have flow controlled the peer, ignore any bad I-frames from him */ |
| if ( (tx_seq != p_fcrb->next_seq_expected) && (p_fcrb->local_busy) ) |
| { |
| L2CAP_TRACE_WARNING ("Dropping bad I-Frame since we flowed off, tx_seq:%u", tx_seq); |
| l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, 0); |
| GKI_freebuf(p_buf); |
| return; |
| } |
| |
| /* Check if tx-sequence is the expected one */ |
| if (tx_seq != p_fcrb->next_seq_expected) |
| { |
| num_lost = (tx_seq - p_fcrb->next_seq_expected) & L2CAP_FCR_SEQ_MODULO; |
| |
| /* Is the frame a duplicate ? If so, just drop it */ |
| if (num_lost >= p_ccb->our_cfg.fcr.tx_win_sz) |
| { |
| /* Duplicate - simply drop it */ |
| L2CAP_TRACE_WARNING ("process_i_frame() Dropping Duplicate Frame tx_seq:%u ExpectedTxSeq %u", tx_seq, p_fcrb->next_seq_expected); |
| GKI_freebuf(p_buf); |
| } |
| else |
| { |
| L2CAP_TRACE_WARNING ("process_i_frame() CID: 0x%04x Lost: %u tx_seq:%u ExpTxSeq %u Rej: %u SRej: %u", |
| p_ccb->local_cid, num_lost, tx_seq, p_fcrb->next_seq_expected, p_fcrb->rej_sent, p_fcrb->srej_sent); |
| |
| if (p_fcrb->srej_sent) |
| { |
| /* If SREJ sent, save the frame for later processing as long as it is in sequence */ |
| next_srej = (((BT_HDR *)GKI_getlast(&p_fcrb->srej_rcv_hold_q))->layer_specific + 1) & L2CAP_FCR_SEQ_MODULO; |
| |
| if ( (tx_seq == next_srej) && (GKI_queue_length(&p_fcrb->srej_rcv_hold_q) < p_ccb->our_cfg.fcr.tx_win_sz) ) |
| { |
| /* If user gave us a pool for held rx buffers, use that */ |
| /* TODO: Could that happen? Get rid of this code. */ |
| if (p_ccb->ertm_info.fcr_rx_buf_size != L2CAP_FCR_RX_BUF_SIZE) |
| { |
| BT_HDR *p_buf2; |
| |
| /* Adjust offset and len so that control word is copied */ |
| p_buf->offset -= L2CAP_FCR_OVERHEAD; |
| p_buf->len += L2CAP_FCR_OVERHEAD; |
| |
| p_buf2 = l2c_fcr_clone_buf(p_buf, p_buf->offset, p_buf->len); |
| |
| if (p_buf2) |
| { |
| GKI_freebuf (p_buf); |
| p_buf = p_buf2; |
| } |
| p_buf->offset += L2CAP_FCR_OVERHEAD; |
| p_buf->len -= L2CAP_FCR_OVERHEAD; |
| } |
| L2CAP_TRACE_DEBUG ("process_i_frame() Lost: %u tx_seq:%u ExpTxSeq %u Rej: %u SRej1", |
| num_lost, tx_seq, p_fcrb->next_seq_expected, p_fcrb->rej_sent); |
| |
| p_buf->layer_specific = tx_seq; |
| GKI_enqueue (&p_fcrb->srej_rcv_hold_q, p_buf); |
| } |
| else |
| { |
| L2CAP_TRACE_WARNING ("process_i_frame() CID: 0x%04x frame dropped in Srej Sent next_srej:%u hold_q.count:%u win_sz:%u", |
| p_ccb->local_cid, next_srej, GKI_queue_length(&p_fcrb->srej_rcv_hold_q), p_ccb->our_cfg.fcr.tx_win_sz); |
| |
| p_fcrb->rej_after_srej = TRUE; |
| GKI_freebuf (p_buf); |
| } |
| } |
| else if (p_fcrb->rej_sent) |
| { |
| L2CAP_TRACE_WARNING ("process_i_frame() CID: 0x%04x Lost: %u tx_seq:%u ExpTxSeq %u Rej: 1 SRej: %u", |
| p_ccb->local_cid, num_lost, tx_seq, p_fcrb->next_seq_expected, p_fcrb->srej_sent); |
| |
| /* If REJ sent, just drop the frame */ |
| GKI_freebuf (p_buf); |
| } |
| else |
| { |
| L2CAP_TRACE_DEBUG ("process_i_frame() CID: 0x%04x tx_seq:%u ExpTxSeq %u Rej: %u", |
| p_ccb->local_cid, tx_seq, p_fcrb->next_seq_expected, p_fcrb->rej_sent); |
| |
| /* If only one lost, we will send SREJ, otherwise we will send REJ */ |
| if (num_lost > 1) |
| { |
| GKI_freebuf (p_buf); |
| p_fcrb->rej_sent = TRUE; |
| l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_REJ, 0); |
| } |
| else |
| { |
| if (!GKI_queue_is_empty(&p_fcrb->srej_rcv_hold_q)) |
| { |
| L2CAP_TRACE_ERROR ("process_i_frame() CID: 0x%04x sending SREJ tx_seq:%d hold_q.count:%u", |
| p_ccb->local_cid, tx_seq, GKI_queue_length(&p_fcrb->srej_rcv_hold_q)); |
| } |
| p_buf->layer_specific = tx_seq; |
| GKI_enqueue (&p_fcrb->srej_rcv_hold_q, p_buf); |
| p_fcrb->srej_sent = TRUE; |
| l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_SREJ, 0); |
| } |
| btu_stop_quick_timer (&p_ccb->fcrb.ack_timer); |
| } |
| } |
| return; |
| } |
| |
| /* Seq number is the next expected. Clear possible reject exception in case it occured */ |
| p_fcrb->rej_sent = p_fcrb->srej_sent = FALSE; |
| |
| /* Adjust the next_seq, so that if the upper layer sends more data in the callback |
| context, the received frame is acked by an I-frame. */ |
| p_fcrb->next_seq_expected = (tx_seq + 1) & L2CAP_FCR_SEQ_MODULO; |
| |
| /* If any SAR problem in eRTM mode, spec says disconnect. */ |
| if (!do_sar_reassembly (p_ccb, p_buf, ctrl_word)) |
| { |
| L2CAP_TRACE_WARNING ("process_i_frame() CID: 0x%04x reassembly failed", p_ccb->local_cid); |
| l2cu_disconnect_chnl (p_ccb); |
| return; |
| } |
| |
| /* RR optimization - if peer can still send us more, then start an ACK timer */ |
| num_to_ack = (p_fcrb->next_seq_expected - p_fcrb->last_ack_sent) & L2CAP_FCR_SEQ_MODULO; |
| |
| if ( (num_to_ack < p_ccb->fcrb.max_held_acks) && (!p_fcrb->local_busy) ) |
| delay_ack = TRUE; |
| |
| /* We should neve never ack frame if we are not in OPEN state */ |
| if ((num_to_ack != 0) && p_ccb->in_use && (p_ccb->chnl_state == CST_OPEN)) |
| { |
| /* If no frames are awaiting transmission or are held, send an RR or RNR S-frame for ack */ |
| if (delay_ack) |
| { |
| /* If it is the first I frame we did not ack, start ack timer */ |
| if (!p_ccb->fcrb.ack_timer.in_use) |
| { |
| btu_start_quick_timer (&p_ccb->fcrb.ack_timer, BTU_TTYPE_L2CAP_FCR_ACK, |
| (L2CAP_FCR_ACK_TOUT*QUICK_TIMER_TICKS_PER_SEC)/1000); |
| } |
| } |
| else if ( ((GKI_queue_is_empty(&p_ccb->xmit_hold_q)) || (l2c_fcr_is_flow_controlled (p_ccb))) |
| && (GKI_queue_is_empty(&p_ccb->fcrb.srej_rcv_hold_q))) |
| { |
| if (p_fcrb->local_busy) |
| l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, 0); |
| else |
| l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, 0); |
| } |
| } |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function process_stream_frame |
| ** |
| ** Description This function processes frames in streaming mode |
| ** |
| ** Returns - |
| ** |
| *******************************************************************************/ |
| static void process_stream_frame (tL2C_CCB *p_ccb, BT_HDR *p_buf) |
| { |
| assert(p_ccb != NULL); |
| assert(p_buf != NULL); |
| |
| UINT16 ctrl_word; |
| UINT16 fcs; |
| UINT8 *p; |
| UINT8 tx_seq; |
| |
| /* Verify FCS if using */ |
| if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) |
| { |
| p = ((UINT8 *)(p_buf+1)) + p_buf->offset + p_buf->len - L2CAP_FCS_LEN; |
| |
| /* Extract and drop the FCS from the packet */ |
| STREAM_TO_UINT16 (fcs, p); |
| p_buf->len -= L2CAP_FCS_LEN; |
| |
| if (l2c_fcr_rx_get_fcs(p_buf) != fcs) |
| { |
| L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x BAD FCS", p_ccb->local_cid); |
| GKI_freebuf(p_buf); |
| return; |
| } |
| } |
| |
| /* Get the control word */ |
| p = ((UINT8 *)(p_buf+1)) + p_buf->offset; |
| |
| STREAM_TO_UINT16 (ctrl_word, p); |
| |
| p_buf->len -= L2CAP_FCR_OVERHEAD; |
| p_buf->offset += L2CAP_FCR_OVERHEAD; |
| |
| /* Make sure it is an I-frame */ |
| if (ctrl_word & L2CAP_FCR_S_FRAME_BIT) |
| { |
| 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); |
| GKI_freebuf (p_buf); |
| return; |
| } |
| |
| #if BT_TRACE_VERBOSE == TRUE |
| L2CAP_TRACE_EVENT ("L2CAP eRTM Rx I-frame: cid: 0x%04x Len: %u SAR: %-12s TxSeq: %u ReqSeq: %u F: %u", |
| p_ccb->local_cid, p_buf->len, |
| SAR_types[(ctrl_word & L2CAP_FCR_SAR_BITS) >> L2CAP_FCR_SAR_BITS_SHIFT], |
| (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT, |
| (ctrl_word & L2CAP_FCR_REQ_SEQ_BITS) >> L2CAP_FCR_REQ_SEQ_BITS_SHIFT, |
| (ctrl_word & L2CAP_FCR_F_BIT) >> L2CAP_FCR_F_BIT_SHIFT); |
| #endif |
| |
| /* Extract the sequence number */ |
| tx_seq = (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT; |
| |
| /* Check if tx-sequence is the expected one */ |
| if (tx_seq != p_ccb->fcrb.next_seq_expected) |
| { |
| L2CAP_TRACE_WARNING ("Rx L2CAP PDU: CID: 0x%04x Lost frames Exp: %u Got: %u p_rx_sdu: 0x%08x", |
| p_ccb->local_cid, p_ccb->fcrb.next_seq_expected, tx_seq, p_ccb->fcrb.p_rx_sdu); |
| |
| /* Lost one or more packets, so flush the SAR queue */ |
| if (p_ccb->fcrb.p_rx_sdu != NULL) |
| { |
| GKI_freebuf (p_ccb->fcrb.p_rx_sdu); |
| p_ccb->fcrb.p_rx_sdu = NULL; |
| } |
| } |
| |
| p_ccb->fcrb.next_seq_expected = (tx_seq + 1) & L2CAP_FCR_SEQ_MODULO; |
| |
| if (!do_sar_reassembly (p_ccb, p_buf, ctrl_word)) |
| { |
| /* Some sort of SAR error, so flush the SAR queue */ |
| if (p_ccb->fcrb.p_rx_sdu != NULL) |
| { |
| GKI_freebuf (p_ccb->fcrb.p_rx_sdu); |
| p_ccb->fcrb.p_rx_sdu = NULL; |
| } |
| } |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function do_sar_reassembly |
| ** |
| ** Description Process SAR bits and re-assemble frame |
| ** |
| ** Returns TRUE if all OK, else FALSE |
| ** |
| *******************************************************************************/ |
| static BOOLEAN do_sar_reassembly (tL2C_CCB *p_ccb, BT_HDR *p_buf, UINT16 ctrl_word) |
| { |
| assert(p_ccb != NULL); |
| assert(p_buf != NULL); |
| |
| tL2C_FCRB *p_fcrb = &p_ccb->fcrb; |
| UINT16 sar_type = ctrl_word & L2CAP_FCR_SEG_BITS; |
| BOOLEAN packet_ok = TRUE; |
| UINT8 *p; |
| |
| /* Check if the SAR state is correct */ |
| if ((sar_type == L2CAP_FCR_UNSEG_SDU) || (sar_type == L2CAP_FCR_START_SDU)) |
| { |
| if (p_fcrb->p_rx_sdu != NULL) |
| { |
| L2CAP_TRACE_WARNING ("SAR - got unexpected unsegmented or start SDU Expected len: %u Got so far: %u", |
| p_fcrb->rx_sdu_len, p_fcrb->p_rx_sdu->len); |
| |
| packet_ok = FALSE; |
| } |
| /* Check the length of the packet */ |
| if ( (sar_type == L2CAP_FCR_START_SDU) && (p_buf->len < L2CAP_SDU_LEN_OVERHEAD) ) |
| { |
| L2CAP_TRACE_WARNING ("SAR start packet too short: %u", p_buf->len); |
| packet_ok = FALSE; |
| } |
| } |
| else |
| { |
| if (p_fcrb->p_rx_sdu == NULL) |
| { |
| L2CAP_TRACE_WARNING ("SAR - got unexpected cont or end SDU"); |
| packet_ok = FALSE; |
| } |
| } |
| |
| if ( (packet_ok) && (sar_type != L2CAP_FCR_UNSEG_SDU) ) |
| { |
| p = ((UINT8 *)(p_buf + 1)) + p_buf->offset; |
| |
| /* For start SDU packet, extract the SDU length */ |
| if (sar_type == L2CAP_FCR_START_SDU) |
| { |
| /* Get the SDU length */ |
| STREAM_TO_UINT16 (p_fcrb->rx_sdu_len, p); |
| p_buf->offset += 2; |
| p_buf->len -= 2; |
| |
| if (p_fcrb->rx_sdu_len > p_ccb->max_rx_mtu) |
| { |
| L2CAP_TRACE_WARNING ("SAR - SDU len: %u larger than MTU: %u", p_fcrb->rx_sdu_len, p_fcrb->rx_sdu_len); |
| packet_ok = FALSE; |
| } |
| else if ((p_fcrb->p_rx_sdu = (BT_HDR *)GKI_getbuf(L2CAP_MAX_BUF_SIZE)) == NULL) |
| { |
| L2CAP_TRACE_ERROR ("SAR - no buffer for SDU start"); |
| packet_ok = FALSE; |
| } |
| else |
| { |
| p_fcrb->p_rx_sdu->offset = OBX_BUF_MIN_OFFSET; |
| p_fcrb->p_rx_sdu->len = 0; |
| } |
| } |
| |
| if (packet_ok) |
| { |
| if ((p_fcrb->p_rx_sdu->len + p_buf->len) > p_fcrb->rx_sdu_len) |
| { |
| L2CAP_TRACE_ERROR ("SAR - SDU len exceeded Type: %u Lengths: %u %u %u", |
| sar_type, p_fcrb->p_rx_sdu->len, p_buf->len, p_fcrb->rx_sdu_len); |
| packet_ok = FALSE; |
| } |
| else if ( (sar_type == L2CAP_FCR_END_SDU) && ((p_fcrb->p_rx_sdu->len + p_buf->len) != p_fcrb->rx_sdu_len) ) |
| { |
| L2CAP_TRACE_WARNING ("SAR - SDU end rcvd but SDU incomplete: %u %u %u", |
| p_fcrb->p_rx_sdu->len, p_buf->len, p_fcrb->rx_sdu_len); |
| packet_ok = FALSE; |
| } |
| else |
| { |
| memcpy (((UINT8 *) (p_fcrb->p_rx_sdu + 1)) + p_fcrb->p_rx_sdu->offset + p_fcrb->p_rx_sdu->len, p, p_buf->len); |
| |
| p_fcrb->p_rx_sdu->len += p_buf->len; |
| |
| GKI_freebuf (p_buf); |
| p_buf = NULL; |
| |
| if (sar_type == L2CAP_FCR_END_SDU) |
| { |
| p_buf = p_fcrb->p_rx_sdu; |
| p_fcrb->p_rx_sdu = NULL; |
| } |
| } |
| } |
| } |
| |
| if (packet_ok == FALSE) |
| { |
| GKI_freebuf (p_buf); |
| } |
| else if (p_buf != NULL) |
| { |
| #if (L2CAP_NUM_FIXED_CHNLS > 0) |
| if (p_ccb->local_cid < L2CAP_BASE_APPL_CID && |
| (p_ccb->local_cid >= L2CAP_FIRST_FIXED_CHNL && p_ccb->local_cid <= L2CAP_LAST_FIXED_CHNL)) |
| { |
| if (l2cb.fixed_reg[p_ccb->local_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb) |
| (*l2cb.fixed_reg[p_ccb->local_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb) |
| (p_ccb->local_cid, p_ccb->p_lcb->remote_bd_addr, p_buf); |
| } |
| else |
| #endif |
| l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DATA, p_buf); |
| } |
| |
| return (packet_ok); |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function retransmit_i_frames |
| ** |
| ** Description This function retransmits i-frames awaiting acks. |
| ** |
| ** Returns BOOLEAN - TRUE if retransmitted |
| ** |
| *******************************************************************************/ |
| static BOOLEAN retransmit_i_frames (tL2C_CCB *p_ccb, UINT8 tx_seq) |
| { |
| assert(p_ccb != NULL); |
| |
| BT_HDR *p_buf, *p_buf2; |
| UINT8 *p; |
| UINT8 buf_seq; |
| UINT16 ctrl_word; |
| |
| if ( (GKI_getfirst(&p_ccb->fcrb.waiting_for_ack_q)) |
| && (p_ccb->peer_cfg.fcr.max_transmit != 0) |
| && (p_ccb->fcrb.num_tries >= p_ccb->peer_cfg.fcr.max_transmit) ) |
| { |
| L2CAP_TRACE_EVENT ("Max Tries Exceeded: (last_acq: %d CID: 0x%04x num_tries: %u (max: %u) ack_q_count: %u", |
| p_ccb->fcrb.last_rx_ack, p_ccb->local_cid, p_ccb->fcrb.num_tries, p_ccb->peer_cfg.fcr.max_transmit, |
| GKI_queue_length(&p_ccb->fcrb.waiting_for_ack_q)); |
| |
| l2cu_disconnect_chnl (p_ccb); |
| return (FALSE); |
| } |
| |
| /* tx_seq indicates whether to retransmit a specific sequence or all (if == L2C_FCR_RETX_ALL_PKTS) */ |
| if (tx_seq != L2C_FCR_RETX_ALL_PKTS) |
| { |
| /* If sending only one, the sequence number tells us which one. Look for it. |
| */ |
| for (p_buf = (BT_HDR *)GKI_getfirst(&p_ccb->fcrb.waiting_for_ack_q); p_buf; p_buf = (BT_HDR *)GKI_getnext (p_buf)) |
| { |
| /* Get the old control word */ |
| p = ((UINT8 *) (p_buf+1)) + p_buf->offset + L2CAP_PKT_OVERHEAD; |
| |
| STREAM_TO_UINT16 (ctrl_word, p); |
| |
| buf_seq = (ctrl_word & L2CAP_FCR_TX_SEQ_BITS) >> L2CAP_FCR_TX_SEQ_BITS_SHIFT; |
| |
| L2CAP_TRACE_DEBUG ("retransmit_i_frames() cur seq: %u looking for: %u", buf_seq, tx_seq); |
| |
| if (tx_seq == buf_seq) |
| break; |
| } |
| |
| if (!p_buf) |
| { |
| L2CAP_TRACE_ERROR ("retransmit_i_frames() UNKNOWN seq: %u q_count: %u", tx_seq, GKI_queue_length(&p_ccb->fcrb.waiting_for_ack_q)); |
| return (TRUE); |
| } |
| } |
| else |
| { |
| // Iterate though list and flush the amount requested from |
| // the transmit data queue that satisfy the layer and event conditions. |
| for (const list_node_t *node = list_begin(p_ccb->p_lcb->link_xmit_data_q); |
| node != list_end(p_ccb->p_lcb->link_xmit_data_q);) { |
| BT_HDR *p_buf = (BT_HDR *)list_node(node); |
| node = list_next(node); |
| |
| /* Do not flush other CIDs or partial segments */ |
| if ((p_buf->layer_specific == 0) && (p_buf->event == p_ccb->local_cid)) { |
| list_remove(p_ccb->p_lcb->link_xmit_data_q, p_buf); |
| GKI_freebuf(p_buf); |
| } |
| } |
| |
| /* Also flush our retransmission queue */ |
| while (!GKI_queue_is_empty(&p_ccb->fcrb.retrans_q)) |
| GKI_freebuf (GKI_dequeue (&p_ccb->fcrb.retrans_q)); |
| |
| p_buf = (BT_HDR *)GKI_getfirst(&p_ccb->fcrb.waiting_for_ack_q); |
| } |
| |
| while (p_buf != NULL) |
| { |
| p_buf2 = l2c_fcr_clone_buf(p_buf, p_buf->offset, p_buf->len); |
| |
| if (p_buf2) |
| { |
| p_buf2->layer_specific = p_buf->layer_specific; |
| |
| GKI_enqueue (&p_ccb->fcrb.retrans_q, p_buf2); |
| } |
| |
| if ( (tx_seq != L2C_FCR_RETX_ALL_PKTS) || (p_buf2 == NULL) ) |
| break; |
| else |
| p_buf = (BT_HDR *)GKI_getnext (p_buf); |
| } |
| |
| l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, NULL); |
| |
| if (GKI_queue_length(&p_ccb->fcrb.waiting_for_ack_q)) |
| { |
| p_ccb->fcrb.num_tries++; |
| l2c_fcr_start_timer (p_ccb); |
| } |
| |
| return (TRUE); |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_get_next_xmit_sdu_seg |
| ** |
| ** Description Get the next SDU segment to transmit. |
| ** |
| ** Returns pointer to buffer with segment or NULL |
| ** |
| *******************************************************************************/ |
| BT_HDR *l2c_fcr_get_next_xmit_sdu_seg (tL2C_CCB *p_ccb, UINT16 max_packet_length) |
| { |
| assert(p_ccb != NULL); |
| |
| BOOLEAN first_seg = FALSE, /* The segment is the first part of data */ |
| mid_seg = FALSE, /* The segment is the middle part of data */ |
| last_seg = FALSE; /* The segment is the last part of data */ |
| UINT16 sdu_len = 0; |
| BT_HDR *p_buf, *p_xmit; |
| UINT8 *p; |
| UINT16 max_pdu = p_ccb->tx_mps /* Needed? - L2CAP_MAX_HEADER_FCS*/; |
| |
| /* If there is anything in the retransmit queue, that goes first |
| */ |
| if (GKI_getfirst(&p_ccb->fcrb.retrans_q)) |
| { |
| p_buf = (BT_HDR *)GKI_dequeue (&p_ccb->fcrb.retrans_q); |
| |
| /* Update Rx Seq and FCS if we acked some packets while this one was queued */ |
| prepare_I_frame (p_ccb, p_buf, TRUE); |
| |
| p_buf->event = p_ccb->local_cid; |
| |
| #if (L2CAP_ERTM_STATS == TRUE) |
| p_ccb->fcrb.pkts_retransmitted++; |
| p_ccb->fcrb.ertm_pkt_counts[0]++; |
| p_ccb->fcrb.ertm_byte_counts[0] += (p_buf->len - 8); |
| #endif |
| return (p_buf); |
| } |
| |
| /* For BD/EDR controller, max_packet_length is set to 0 */ |
| /* For AMP controller, max_packet_length is set by available blocks */ |
| if ( (max_packet_length > L2CAP_MAX_HEADER_FCS) |
| && (max_pdu + L2CAP_MAX_HEADER_FCS > max_packet_length) ) |
| { |
| max_pdu = max_packet_length - L2CAP_MAX_HEADER_FCS; |
| } |
| |
| p_buf = (BT_HDR *)GKI_getfirst(&p_ccb->xmit_hold_q); |
| |
| /* If there is more data than the MPS, it requires segmentation */ |
| if (p_buf->len > max_pdu) |
| { |
| /* We are using the "event" field to tell is if we already started segmentation */ |
| if (p_buf->event == 0) |
| { |
| first_seg = TRUE; |
| sdu_len = p_buf->len; |
| } |
| else |
| mid_seg = TRUE; |
| |
| /* Get a new buffer and copy the data that can be sent in a PDU */ |
| p_xmit = l2c_fcr_clone_buf(p_buf, L2CAP_MIN_OFFSET + L2CAP_SDU_LEN_OFFSET, |
| max_pdu); |
| |
| if (p_xmit != NULL) |
| { |
| p_buf->event = p_ccb->local_cid; |
| p_xmit->event = p_ccb->local_cid; |
| |
| p_buf->len -= max_pdu; |
| p_buf->offset += max_pdu; |
| |
| /* copy PBF setting */ |
| p_xmit->layer_specific = p_buf->layer_specific; |
| } |
| else /* Should never happen if the application has configured buffers correctly */ |
| { |
| L2CAP_TRACE_ERROR ("L2CAP - cannot get buffer for segmentation, max_pdu: %u", max_pdu); |
| return (NULL); |
| } |
| } |
| else /* Use the original buffer if no segmentation, or the last segment */ |
| { |
| p_xmit = (BT_HDR *)GKI_dequeue (&p_ccb->xmit_hold_q); |
| |
| if (p_xmit->event != 0) |
| last_seg = TRUE; |
| |
| p_xmit->event = p_ccb->local_cid; |
| } |
| |
| /* Step back to add the L2CAP headers */ |
| p_xmit->offset -= (L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD); |
| p_xmit->len += L2CAP_PKT_OVERHEAD + L2CAP_FCR_OVERHEAD; |
| |
| if (first_seg) |
| { |
| p_xmit->offset -= L2CAP_SDU_LEN_OVERHEAD; |
| p_xmit->len += L2CAP_SDU_LEN_OVERHEAD; |
| } |
| |
| /* Set the pointer to the beginning of the data */ |
| p = (UINT8 *)(p_xmit + 1) + p_xmit->offset; |
| |
| /* Now the L2CAP header */ |
| |
| /* Note: if FCS has to be included then the length is recalculated later */ |
| UINT16_TO_STREAM (p, p_xmit->len - L2CAP_PKT_OVERHEAD); |
| |
| UINT16_TO_STREAM (p, p_ccb->remote_cid); |
| |
| if (first_seg) |
| { |
| /* Skip control word and add SDU length */ |
| p += 2; |
| UINT16_TO_STREAM (p, sdu_len); |
| |
| /* We will store the SAR type in layer-specific */ |
| /* layer_specific is shared with flushable flag(bits 0-1), don't clear it */ |
| p_xmit->layer_specific |= L2CAP_FCR_START_SDU; |
| |
| first_seg = FALSE; |
| } |
| else if (mid_seg) |
| p_xmit->layer_specific |= L2CAP_FCR_CONT_SDU; |
| else if (last_seg) |
| p_xmit->layer_specific |= L2CAP_FCR_END_SDU; |
| else |
| p_xmit->layer_specific |= L2CAP_FCR_UNSEG_SDU; |
| |
| prepare_I_frame (p_ccb, p_xmit, FALSE); |
| |
| if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) |
| { |
| BT_HDR *p_wack = l2c_fcr_clone_buf(p_xmit, HCI_DATA_PREAMBLE_SIZE, p_xmit->len); |
| |
| if (!p_wack) |
| { |
| L2CAP_TRACE_ERROR("L2CAP - no buffer for xmit cloning, CID: 0x%04x Length: %u", |
| p_ccb->local_cid, p_xmit->len); |
| |
| /* We will not save the FCS in case we reconfigure and change options */ |
| if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) |
| p_xmit->len -= L2CAP_FCS_LEN; |
| |
| /* Pretend we sent it and it got lost */ |
| GKI_enqueue (&p_ccb->fcrb.waiting_for_ack_q, p_xmit); |
| return (NULL); |
| } |
| else |
| { |
| #if (L2CAP_ERTM_STATS == TRUE) |
| /* set timestamp at the end of tx I-frame to get acking delay */ |
| p = ((UINT8 *) (p_wack+1)) + p_wack->offset + p_wack->len; |
| UINT32_TO_STREAM (p, time_get_os_boottime_ms()); |
| #endif |
| /* We will not save the FCS in case we reconfigure and change options */ |
| if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) |
| p_wack->len -= L2CAP_FCS_LEN; |
| |
| p_wack->layer_specific = p_xmit->layer_specific; |
| GKI_enqueue (&p_ccb->fcrb.waiting_for_ack_q, p_wack); |
| } |
| |
| #if (L2CAP_ERTM_STATS == TRUE) |
| p_ccb->fcrb.ertm_pkt_counts[0]++; |
| p_ccb->fcrb.ertm_byte_counts[0] += (p_xmit->len - 8); |
| #endif |
| |
| } |
| |
| return (p_xmit); |
| } |
| |
| |
| /******************************************************************************* |
| ** Configuration negotiation functions |
| ** |
| ** The following functions are used in negotiating channel modes during |
| ** configuration |
| ********************************************************************************/ |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_chk_chan_modes |
| ** |
| ** Description Validates and adjusts if necessary, the FCR options |
| ** based on remote EXT features. |
| ** |
| ** Note: This assumes peer EXT Features have been received. |
| ** Basic mode is used if FCR Options have not been received |
| ** |
| ** Returns UINT8 - nonzero if can continue, '0' if no compatible channels |
| ** |
| *******************************************************************************/ |
| UINT8 l2c_fcr_chk_chan_modes (tL2C_CCB *p_ccb) |
| { |
| assert(p_ccb != NULL); |
| |
| /* Remove nonbasic options that the peer does not support */ |
| if (!(p_ccb->p_lcb->peer_ext_fea & L2CAP_EXTFEA_ENH_RETRANS)) |
| p_ccb->ertm_info.allowed_modes &= ~L2CAP_FCR_CHAN_OPT_ERTM; |
| |
| if (!(p_ccb->p_lcb->peer_ext_fea & L2CAP_EXTFEA_STREAM_MODE)) |
| p_ccb->ertm_info.allowed_modes &= ~L2CAP_FCR_CHAN_OPT_STREAM; |
| |
| /* At least one type needs to be set (Basic, ERTM, STM) to continue */ |
| if (!p_ccb->ertm_info.allowed_modes) |
| { |
| L2CAP_TRACE_WARNING ("L2CAP - Peer does not support our desired channel types"); |
| } |
| |
| return (p_ccb->ertm_info.allowed_modes); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_adj_our_req_options |
| ** |
| ** Description Validates and sets up the FCR options passed in from |
| ** L2CA_ConfigReq based on remote device's features. |
| ** |
| ** Returns TRUE if no errors, Otherwise FALSE |
| ** |
| *******************************************************************************/ |
| BOOLEAN l2c_fcr_adj_our_req_options (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg) |
| { |
| assert(p_ccb != NULL); |
| assert(p_cfg != NULL); |
| |
| tL2CAP_FCR_OPTS *p_fcr = &p_cfg->fcr; |
| |
| if (p_fcr->mode != p_ccb->ertm_info.preferred_mode) |
| { |
| L2CAP_TRACE_WARNING ("l2c_fcr_adj_our_req_options - preferred_mode (%d), does not match mode (%d)", |
| p_ccb->ertm_info.preferred_mode, p_fcr->mode); |
| |
| /* The preferred mode is passed in through tL2CAP_ERTM_INFO, so override this one */ |
| p_fcr->mode = p_ccb->ertm_info.preferred_mode; |
| } |
| |
| /* If upper layer did not request eRTM mode, BASIC must be used */ |
| if (p_ccb->ertm_info.allowed_modes == L2CAP_FCR_CHAN_OPT_BASIC) |
| { |
| if (p_cfg->fcr_present && p_fcr->mode != L2CAP_FCR_BASIC_MODE) |
| { |
| L2CAP_TRACE_WARNING ("l2c_fcr_adj_our_req_options (mode %d): ERROR: No FCR options set using BASIC mode", p_fcr->mode); |
| } |
| p_fcr->mode = L2CAP_FCR_BASIC_MODE; |
| } |
| |
| /* Process the FCR options if initial channel bring-up (not a reconfig request) |
| ** Determine initial channel mode to try based on our options and remote's features |
| */ |
| if (p_cfg->fcr_present && !(p_ccb->config_done & RECONFIG_FLAG)) |
| { |
| /* We need to have at least one mode type common with the peer */ |
| if (!l2c_fcr_chk_chan_modes(p_ccb)) |
| { |
| /* Two channels have incompatible supported types */ |
| l2cu_disconnect_chnl (p_ccb); |
| return (FALSE); |
| } |
| |
| /* Basic is the only common channel mode between the two devices */ |
| else if (p_ccb->ertm_info.allowed_modes == L2CAP_FCR_CHAN_OPT_BASIC) |
| { |
| /* We only want to try Basic, so bypass sending the FCR options entirely */ |
| p_cfg->fcr_present = FALSE; |
| p_cfg->fcs_present = FALSE; /* Illegal to use FCS option in basic mode */ |
| p_cfg->ext_flow_spec_present = FALSE; /* Illegal to use extended flow spec in basic mode */ |
| } |
| |
| /* We have at least one non-basic mode available |
| * Override mode from available mode options based on preference, if needed |
| */ |
| else |
| { |
| /* If peer does not support STREAMING, try ERTM */ |
| if (p_fcr->mode == L2CAP_FCR_STREAM_MODE && !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_STREAM)) |
| { |
| L2CAP_TRACE_DEBUG ("L2C CFG: mode is STREAM, but peer does not support; Try ERTM"); |
| p_fcr->mode = L2CAP_FCR_ERTM_MODE; |
| } |
| |
| /* If peer does not support ERTM, try BASIC (will support this if made it here in the code) */ |
| if (p_fcr->mode == L2CAP_FCR_ERTM_MODE && !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM)) |
| { |
| L2CAP_TRACE_DEBUG ("L2C CFG: mode is ERTM, but peer does not support; Try BASIC"); |
| p_fcr->mode = L2CAP_FCR_BASIC_MODE; |
| } |
| } |
| |
| if (p_fcr->mode != L2CAP_FCR_BASIC_MODE) |
| { |
| /* MTU must be smaller than buffer size */ |
| if ( (p_cfg->mtu_present) && (p_cfg->mtu > p_ccb->max_rx_mtu) ) |
| { |
| L2CAP_TRACE_WARNING ("L2CAP - MTU: %u larger than buf size: %u", p_cfg->mtu, p_ccb->max_rx_mtu); |
| return (FALSE); |
| } |
| |
| /* application want to use the default MPS */ |
| if (p_fcr->mps == L2CAP_DEFAULT_ERM_MPS) |
| { |
| p_fcr->mps = L2CAP_MPS_OVER_BR_EDR; |
| } |
| /* MPS must be less than MTU */ |
| else if (p_fcr->mps > p_ccb->max_rx_mtu) |
| { |
| L2CAP_TRACE_WARNING ("L2CAP - MPS %u invalid MTU: %u", p_fcr->mps, p_ccb->max_rx_mtu); |
| return (FALSE); |
| } |
| |
| /* We always initially read into the HCI buffer pool, so make sure it fits */ |
| if (p_fcr->mps > (L2CAP_MTU_SIZE - L2CAP_MAX_HEADER_FCS)) |
| p_fcr->mps = L2CAP_MTU_SIZE - L2CAP_MAX_HEADER_FCS; |
| } |
| else |
| { |
| p_cfg->fcs_present = FALSE; /* Illegal to use FCS option in basic mode */ |
| p_cfg->ext_flow_spec_present = FALSE; /* Illegal to use extended flow spec in basic mode */ |
| } |
| |
| p_ccb->our_cfg.fcr = *p_fcr; |
| } |
| else /* Not sure how to send a reconfiguration(??) should fcr be included? */ |
| { |
| p_ccb->our_cfg.fcr_present = FALSE; |
| } |
| |
| return (TRUE); |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_adj_monitor_retran_timeout |
| ** |
| ** Description Overrides monitor/retrans timer value based on controller |
| ** |
| ** Returns None |
| ** |
| *******************************************************************************/ |
| void l2c_fcr_adj_monitor_retran_timeout (tL2C_CCB *p_ccb) |
| { |
| assert(p_ccb != NULL); |
| |
| /* adjust our monitor/retran timeout */ |
| if (p_ccb->out_cfg_fcr_present) |
| { |
| /* |
| ** if we requestd ERTM or accepted ERTM |
| ** We may accept ERTM even if we didn't request ERTM, in case of requesting STREAM |
| */ |
| if ((p_ccb->our_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) |
| ||(p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_ERTM_MODE)) |
| { |
| /* upper layer setting is ignored */ |
| p_ccb->our_cfg.fcr.mon_tout = L2CAP_MIN_MONITOR_TOUT; |
| p_ccb->our_cfg.fcr.rtrans_tout = L2CAP_MIN_RETRANS_TOUT; |
| } |
| else |
| { |
| p_ccb->our_cfg.fcr.mon_tout = 0; |
| p_ccb->our_cfg.fcr.rtrans_tout = 0; |
| } |
| |
| L2CAP_TRACE_DEBUG ("l2c_fcr_adj_monitor_retran_timeout: mon_tout:%d, rtrans_tout:%d", |
| p_ccb->our_cfg.fcr.mon_tout, p_ccb->our_cfg.fcr.rtrans_tout); |
| } |
| } |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_adj_our_rsp_options |
| ** |
| ** Description Overrides any neccesary FCR options passed in from |
| ** L2CA_ConfigRsp based on our FCR options. |
| ** Only makes adjustments if channel is in ERTM mode. |
| ** |
| ** Returns None |
| ** |
| *******************************************************************************/ |
| void l2c_fcr_adj_our_rsp_options (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg) |
| { |
| assert(p_ccb != NULL); |
| assert(p_cfg != NULL); |
| |
| /* adjust our monitor/retran timeout */ |
| l2c_fcr_adj_monitor_retran_timeout(p_ccb); |
| |
| p_cfg->fcr_present = p_ccb->out_cfg_fcr_present; |
| |
| if (p_cfg->fcr_present) |
| { |
| // btla-specific ++ |
| /* Temporary - until a better algorithm is implemented */ |
| /* 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. */ |
| /* Note: peer is not guaranteed to obey our adjustment */ |
| if (p_ccb->peer_cfg.fcr.tx_win_sz > p_ccb->our_cfg.fcr.tx_win_sz) |
| { |
| 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); |
| p_ccb->peer_cfg.fcr.tx_win_sz = p_ccb->our_cfg.fcr.tx_win_sz; |
| } |
| // btla-specific -- |
| |
| p_cfg->fcr.mode = p_ccb->peer_cfg.fcr.mode; |
| p_cfg->fcr.tx_win_sz = p_ccb->peer_cfg.fcr.tx_win_sz; |
| p_cfg->fcr.max_transmit = p_ccb->peer_cfg.fcr.max_transmit; |
| p_cfg->fcr.mps = p_ccb->peer_cfg.fcr.mps; |
| p_cfg->fcr.rtrans_tout = p_ccb->our_cfg.fcr.rtrans_tout; |
| p_cfg->fcr.mon_tout = p_ccb->our_cfg.fcr.mon_tout; |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_renegotiate_chan |
| ** |
| ** Description Called upon unsuccessful peer response to config request. |
| ** If the error is because of the channel mode, it will try |
| ** to resend using another supported optional channel. |
| ** |
| ** Returns TRUE if resent configuration, False if channel matches or |
| ** cannot match. |
| ** |
| *******************************************************************************/ |
| BOOLEAN l2c_fcr_renegotiate_chan(tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg) |
| { |
| assert(p_ccb != NULL); |
| assert(p_cfg != NULL); |
| |
| UINT8 peer_mode = p_ccb->our_cfg.fcr.mode; |
| BOOLEAN can_renegotiate; |
| |
| /* Skip if this is a reconfiguration from OPEN STATE or if FCR is not returned */ |
| if (!p_cfg->fcr_present || (p_ccb->config_done & RECONFIG_FLAG)) |
| return (FALSE); |
| |
| /* Only retry if there are more channel options to try */ |
| if (p_cfg->result == L2CAP_CFG_UNACCEPTABLE_PARAMS) |
| { |
| peer_mode = (p_cfg->fcr_present) ? p_cfg->fcr.mode : L2CAP_FCR_BASIC_MODE; |
| |
| if (p_ccb->our_cfg.fcr.mode != peer_mode) |
| { |
| |
| if ((--p_ccb->fcr_cfg_tries) == 0) |
| { |
| p_cfg->result = L2CAP_CFG_FAILED_NO_REASON; |
| L2CAP_TRACE_WARNING ("l2c_fcr_renegotiate_chan (Max retries exceeded)"); |
| } |
| |
| can_renegotiate = FALSE; |
| |
| /* Try another supported mode if available based on our last attempted channel */ |
| switch (p_ccb->our_cfg.fcr.mode) |
| { |
| /* Our Streaming mode request was unnacceptable; try ERTM or Basic */ |
| case L2CAP_FCR_STREAM_MODE: |
| /* Peer wants ERTM and we support it */ |
| if ( (peer_mode == L2CAP_FCR_ERTM_MODE) && (p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM) ) |
| { |
| L2CAP_TRACE_DEBUG ("l2c_fcr_renegotiate_chan(Trying ERTM)"); |
| p_ccb->our_cfg.fcr.mode = L2CAP_FCR_ERTM_MODE; |
| can_renegotiate = TRUE; |
| } |
| else /* Falls through */ |
| |
| case L2CAP_FCR_ERTM_MODE: |
| { |
| /* We can try basic for any other peer mode if we support it */ |
| if (p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_BASIC) |
| { |
| L2CAP_TRACE_DEBUG ("l2c_fcr_renegotiate_chan(Trying Basic)"); |
| can_renegotiate = TRUE; |
| p_ccb->our_cfg.fcr.mode = L2CAP_FCR_BASIC_MODE; |
| } |
| } |
| break; |
| |
| default: |
| /* All other scenarios cannot be renegotiated */ |
| break; |
| } |
| |
| if (can_renegotiate) |
| { |
| p_ccb->our_cfg.fcr_present = TRUE; |
| |
| if (p_ccb->our_cfg.fcr.mode == L2CAP_FCR_BASIC_MODE) |
| { |
| p_ccb->our_cfg.fcs_present = FALSE; |
| p_ccb->our_cfg.ext_flow_spec_present = FALSE; |
| |
| /* Basic Mode uses ACL Data Pool, make sure the MTU fits */ |
| if ( (p_cfg->mtu_present) && (p_cfg->mtu > L2CAP_MTU_SIZE) ) |
| { |
| L2CAP_TRACE_WARNING ("L2CAP - adjust MTU: %u too large", p_cfg->mtu); |
| p_cfg->mtu = L2CAP_MTU_SIZE; |
| } |
| } |
| |
| l2cu_process_our_cfg_req (p_ccb, &p_ccb->our_cfg); |
| l2cu_send_peer_config_req (p_ccb, &p_ccb->our_cfg); |
| btu_start_timer (&p_ccb->timer_entry, BTU_TTYPE_L2CAP_CHNL, L2CAP_CHNL_CFG_TIMEOUT); |
| return (TRUE); |
| } |
| } |
| } |
| |
| /* Disconnect if the channels do not match */ |
| if (p_ccb->our_cfg.fcr.mode != peer_mode) |
| { |
| L2CAP_TRACE_WARNING ("L2C CFG: Channels incompatible (local %d, peer %d)", |
| p_ccb->our_cfg.fcr.mode, peer_mode); |
| l2cu_disconnect_chnl (p_ccb); |
| } |
| |
| return (FALSE); |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_process_peer_cfg_req |
| ** |
| ** Description This function is called to process the FCR options passed |
| ** in the peer's configuration request. |
| ** |
| ** Returns UINT8 - L2CAP_PEER_CFG_OK, L2CAP_PEER_CFG_UNACCEPTABLE, |
| ** or L2CAP_PEER_CFG_DISCONNECT. |
| ** |
| *******************************************************************************/ |
| UINT8 l2c_fcr_process_peer_cfg_req(tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg) |
| { |
| assert(p_ccb != NULL); |
| assert(p_cfg != NULL); |
| |
| UINT16 max_retrans_size; |
| UINT8 fcr_ok = L2CAP_PEER_CFG_OK; |
| |
| p_ccb->p_lcb->w4_info_rsp = FALSE; /* Handles T61x SonyEricsson Bug in Info Request */ |
| |
| L2CAP_TRACE_EVENT ("l2c_fcr_process_peer_cfg_req() CFG fcr_present:%d fcr.mode:%d CCB FCR mode:%d preferred: %u allowed:%u", |
| p_cfg->fcr_present, p_cfg->fcr.mode, p_ccb->our_cfg.fcr.mode, p_ccb->ertm_info.preferred_mode, |
| p_ccb->ertm_info.allowed_modes); |
| |
| /* If Peer wants basic, we are done (accept it or disconnect) */ |
| if (p_cfg->fcr.mode == L2CAP_FCR_BASIC_MODE) |
| { |
| /* If we do not allow basic, disconnect */ |
| if ( !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_BASIC) ) |
| fcr_ok = L2CAP_PEER_CFG_DISCONNECT; |
| } |
| |
| /* Need to negotiate if our modes are not the same */ |
| else if (p_cfg->fcr.mode != p_ccb->ertm_info.preferred_mode) |
| { |
| /* If peer wants a mode that we don't support then retry our mode (ex. rtx/flc), OR |
| ** If we want ERTM and they wanted streaming retry our mode. |
| ** Note: If we have already determined they support our mode previously |
| ** from their EXF mask. |
| */ |
| if ( (((1 << p_cfg->fcr.mode) & L2CAP_FCR_CHAN_OPT_ALL_MASK) == 0) |
| || (p_ccb->ertm_info.preferred_mode == L2CAP_FCR_ERTM_MODE) ) |
| { |
| p_cfg->fcr.mode = p_ccb->our_cfg.fcr.mode; |
| p_cfg->fcr.tx_win_sz = p_ccb->our_cfg.fcr.tx_win_sz; |
| p_cfg->fcr.max_transmit = p_ccb->our_cfg.fcr.max_transmit; |
| fcr_ok = L2CAP_PEER_CFG_UNACCEPTABLE; |
| } |
| |
| /* If we wanted basic, then try to renegotiate it */ |
| else if (p_ccb->ertm_info.preferred_mode == L2CAP_FCR_BASIC_MODE) |
| { |
| p_cfg->fcr.mode = L2CAP_FCR_BASIC_MODE; |
| p_cfg->fcr.max_transmit = p_cfg->fcr.tx_win_sz = 0; |
| p_cfg->fcr.rtrans_tout = p_cfg->fcr.mon_tout = p_cfg->fcr.mps = 0; |
| p_ccb->our_cfg.fcr.rtrans_tout = p_ccb->our_cfg.fcr.mon_tout = p_ccb->our_cfg.fcr.mps = 0; |
| fcr_ok = L2CAP_PEER_CFG_UNACCEPTABLE; |
| } |
| |
| /* Only other valid case is if they want ERTM and we wanted STM which should be |
| accepted if we support it; otherwise the channel should be disconnected */ |
| else if ( (p_cfg->fcr.mode != L2CAP_FCR_ERTM_MODE) |
| || !(p_ccb->ertm_info.allowed_modes & L2CAP_FCR_CHAN_OPT_ERTM) ) |
| { |
| fcr_ok = L2CAP_PEER_CFG_DISCONNECT; |
| } |
| } |
| |
| /* Configuration for FCR channels so make any adjustments and fwd to upper layer */ |
| if (fcr_ok == L2CAP_PEER_CFG_OK) |
| { |
| /* by default don't need to send params in the response */ |
| p_ccb->out_cfg_fcr_present = FALSE; |
| |
| /* Make any needed adjustments for the response to the peer */ |
| if (p_cfg->fcr_present && p_cfg->fcr.mode != L2CAP_FCR_BASIC_MODE) |
| { |
| /* Peer desires to bypass FCS check, and streaming or ERTM mode */ |
| if (p_cfg->fcs_present) |
| { |
| p_ccb->peer_cfg.fcs = p_cfg->fcs; |
| p_ccb->peer_cfg_bits |= L2CAP_CH_CFG_MASK_FCS; |
| if( p_cfg->fcs == L2CAP_CFG_FCS_BYPASS) |
| p_ccb->bypass_fcs |= L2CAP_CFG_FCS_PEER; |
| } |
| |
| max_retrans_size = p_ccb->ertm_info.fcr_tx_buf_size - sizeof(BT_HDR) |
| - L2CAP_MIN_OFFSET - L2CAP_SDU_LEN_OFFSET - L2CAP_FCS_LEN; |
| |
| /* Ensure the MPS is not bigger than the MTU */ |
| if ( (p_cfg->fcr.mps == 0) || (p_cfg->fcr.mps > p_ccb->peer_cfg.mtu) ) |
| { |
| p_cfg->fcr.mps = p_ccb->peer_cfg.mtu; |
| p_ccb->out_cfg_fcr_present = TRUE; |
| } |
| |
| /* Ensure the MPS is not bigger than our retransmission buffer */ |
| if (p_cfg->fcr.mps > max_retrans_size) |
| { |
| L2CAP_TRACE_DEBUG("CFG: Overriding MPS to %d (orig %d)", max_retrans_size, p_cfg->fcr.mps); |
| |
| p_cfg->fcr.mps = max_retrans_size; |
| p_ccb->out_cfg_fcr_present = TRUE; |
| } |
| |
| if (p_cfg->fcr.mode == L2CAP_FCR_ERTM_MODE || p_cfg->fcr.mode == L2CAP_FCR_STREAM_MODE) |
| { |
| /* Always respond with FCR ERTM parameters */ |
| p_ccb->out_cfg_fcr_present = TRUE; |
| } |
| } |
| |
| /* Everything ok, so save the peer's adjusted fcr options */ |
| p_ccb->peer_cfg.fcr = p_cfg->fcr; |
| |
| if (p_cfg->fcr_present) |
| p_ccb->peer_cfg_bits |= L2CAP_CH_CFG_MASK_FCR; |
| } |
| else if (fcr_ok == L2CAP_PEER_CFG_UNACCEPTABLE) |
| { |
| /* Allow peer only one retry for mode */ |
| if (p_ccb->peer_cfg_already_rejected) |
| fcr_ok = L2CAP_PEER_CFG_DISCONNECT; |
| else |
| p_ccb->peer_cfg_already_rejected = TRUE; |
| } |
| |
| return (fcr_ok); |
| } |
| |
| #if (L2CAP_ERTM_STATS == TRUE) |
| /******************************************************************************* |
| ** |
| ** Function l2c_fcr_collect_ack_delay |
| ** |
| ** Description collect throughput, delay, queue size of waiting ack |
| ** |
| ** Parameters |
| ** tL2C_CCB |
| ** |
| ** Returns void |
| ** |
| *******************************************************************************/ |
| static void l2c_fcr_collect_ack_delay (tL2C_CCB *p_ccb, UINT8 num_bufs_acked) |
| { |
| UINT32 index; |
| BT_HDR *p_buf; |
| UINT8 *p; |
| UINT32 timestamp, delay; |
| UINT8 xx; |
| UINT8 str[120]; |
| |
| index = p_ccb->fcrb.ack_delay_avg_index; |
| |
| /* update sum, max and min of waiting for ack queue size */ |
| p_ccb->fcrb.ack_q_count_avg[index] += p_ccb->fcrb.waiting_for_ack_q.count; |
| |
| if ( p_ccb->fcrb.waiting_for_ack_q.count > p_ccb->fcrb.ack_q_count_max[index] ) |
| p_ccb->fcrb.ack_q_count_max[index] = p_ccb->fcrb.waiting_for_ack_q.count; |
| |
| if ( p_ccb->fcrb.waiting_for_ack_q.count < p_ccb->fcrb.ack_q_count_min[index] ) |
| p_ccb->fcrb.ack_q_count_min[index] = p_ccb->fcrb.waiting_for_ack_q.count; |
| |
| /* update sum, max and min of round trip delay of acking */ |
| p_buf = (BT_HDR *)(p_ccb->fcrb.waiting_for_ack_q.p_first); |
| for (xx = 0; (xx < num_bufs_acked)&&(p_buf); xx++) |
| { |
| /* adding up length of acked I-frames to get throughput */ |
| p_ccb->fcrb.throughput[index] += p_buf->len - 8; |
| |
| if ( xx == num_bufs_acked - 1 ) |
| { |
| /* get timestamp from tx I-frame that receiver is acking */ |
| p = ((UINT8 *) (p_buf+1)) + p_buf->offset + p_buf->len; |
| if (p_ccb->bypass_fcs != L2CAP_BYPASS_FCS) |
| { |
| p += L2CAP_FCS_LEN; |
| } |
| |
| STREAM_TO_UINT32(timestamp, p); |
| delay = time_get_os_boottime_ms() - timestamp; |
| |
| p_ccb->fcrb.ack_delay_avg[index] += delay; |
| if ( delay > p_ccb->fcrb.ack_delay_max[index] ) |
| p_ccb->fcrb.ack_delay_max[index] = delay; |
| if ( delay < p_ccb->fcrb.ack_delay_min[index] ) |
| p_ccb->fcrb.ack_delay_min[index] = delay; |
| } |
| |
| p_buf = GKI_getnext(p_buf); |
| } |
| |
| p_ccb->fcrb.ack_delay_avg_count++; |
| |
| /* calculate average and initialize next avg, min and max */ |
| if (p_ccb->fcrb.ack_delay_avg_count > L2CAP_ERTM_STATS_AVG_NUM_SAMPLES) |
| { |
| p_ccb->fcrb.ack_delay_avg_count = 0; |
| |
| p_ccb->fcrb.ack_q_count_avg[index] /= L2CAP_ERTM_STATS_AVG_NUM_SAMPLES; |
| p_ccb->fcrb.ack_delay_avg[index] /= L2CAP_ERTM_STATS_AVG_NUM_SAMPLES; |
| |
| /* calculate throughput */ |
| timestamp = time_get_os_boottime_ms(); |
| if (timestamp - p_ccb->fcrb.throughput_start > 0) |
| p_ccb->fcrb.throughput[index] /= (timestamp - p_ccb->fcrb.throughput_start); |
| |
| p_ccb->fcrb.throughput_start = timestamp; |
| |
| sprintf(str, "[%02u] throughput: %5u, ack_delay avg:%3u, min:%3u, max:%3u, ack_q_count avg:%3u, min:%3u, max:%3u", |
| index, p_ccb->fcrb.throughput[index], |
| p_ccb->fcrb.ack_delay_avg[index], p_ccb->fcrb.ack_delay_min[index], p_ccb->fcrb.ack_delay_max[index], |
| p_ccb->fcrb.ack_q_count_avg[index], p_ccb->fcrb.ack_q_count_min[index], p_ccb->fcrb.ack_q_count_max[index] ); |
| |
| BT_TRACE(TRACE_CTRL_GENERAL | TRACE_LAYER_GKI | TRACE_ORG_GKI , TRACE_TYPE_GENERIC, "%s", str); |
| |
| index = (index + 1) % L2CAP_ERTM_STATS_NUM_AVG; |
| p_ccb->fcrb.ack_delay_avg_index = index; |
| |
| p_ccb->fcrb.ack_q_count_max[index] = 0; |
| p_ccb->fcrb.ack_q_count_min[index] = 0xFFFFFFFF; |
| p_ccb->fcrb.ack_q_count_avg[index] = 0; |
| |
| |
| p_ccb->fcrb.ack_delay_max[index] = 0; |
| p_ccb->fcrb.ack_delay_min[index] = 0xFFFFFFFF; |
| p_ccb->fcrb.ack_delay_avg[index] = 0; |
| |
| p_ccb->fcrb.throughput[index] = 0; |
| } |
| } |
| #endif |