rlc_am_segment.c 25.2 KB
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/*
 * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The OpenAirInterface Software Alliance licenses this file to You under
 * the OAI Public License, Version 1.0  (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.openairinterface.org/?page_id=698
 *
 * 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.
 *-------------------------------------------------------------------------------
 * For more information about the OpenAirInterface (OAI) Software Alliance:
 *      contact@openairinterface.org
 */

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#define RLC_AM_MODULE 1
#define RLC_AM_SEGMENT_C 1
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//-----------------------------------------------------------------------------
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#if USER_MODE
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#include <assert.h>
#endif
//-----------------------------------------------------------------------------
#include "platform_types.h"
//-----------------------------------------------------------------------------
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#include "msc.h"
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#include "list.h"
#include "rlc_am.h"
#include "LAYER2/MAC/extern.h"
#include "UTIL/LOG/log.h"

//-----------------------------------------------------------------------------
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void rlc_am_pdu_polling (
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  const protocol_ctxt_t* const  ctxt_pP,
  rlc_am_entity_t *const rlc_pP,
  rlc_am_pdu_sn_10_t *const pdu_pP,
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  const int16_t payload_sizeP,
  boolean_t is_new_pdu)
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{
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  // 5.2.2 Polling
  // An AM RLC entity can poll its peer AM RLC entity in order to trigger STATUS reporting at the peer AM RLC entity.
  // 5.2.2.1 Transmission of a AMD PDU or AMD PDU segment
  // Upon assembly of a new AMD PDU, the transmitting side of an AM RLC entity shall:
  //     - increment PDU_WITHOUT_POLL by one;
  //     - increment BYTE_WITHOUT_POLL by every new byte of Data field element that it maps to the Data field of
  //       the RLC data PDU;
  //     - if PDU_WITHOUT_POLL >= pollPDU; or
  //     - if BYTE_WITHOUT_POLL >= pollByte;
  //         -include a poll in the RLC data PDU as described below.
  // Upon assembly of an AMD PDU or AMD PDU segment, the transmitting side of an AM RLC entity shall:
  //     - if both the transmission buffer and the retransmission buffer becomes empty (excluding transmitted RLC data
  //       PDU awaiting for acknowledgements) after the transmission of the RLC data PDU; or
  //     - if no new RLC data PDU can be transmitted after the transmission of the RLC data PDU (e.g. due to window
  //       stalling);
  //         - include a poll in the RLC data PDU as described below.
  // To include a poll in a RLC data PDU, the transmitting side of an AM RLC entity shall:
  //     - set the P field of the RLC data PDU to "1";
  //     - set PDU_WITHOUT_POLL to 0;
  //     - set BYTE_WITHOUT_POLL to 0;
  // After delivering a RLC data PDU including a poll to lower layer and after incrementing of VT(S) if necessary, the
  // transmitting side of an AM RLC entity shall:
  //     - set POLL_SN to VT(S) – 1;
  //     - if t-PollRetransmit is not running:
  //         - start t-PollRetransmit;
  //     - else:
  //         - restart t-PollRetransmit;
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  if (is_new_pdu) {
	  if (rlc_pP->poll_pdu != RLC_AM_POLL_PDU_INFINITE) {
		  rlc_pP->c_pdu_without_poll     += 1;
	  }

	  if (rlc_pP->poll_byte != RLC_AM_POLL_BYTE_INFINITE) {
		  rlc_pP->c_byte_without_poll    += payload_sizeP;
	  }
  }
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  if (
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    ((is_new_pdu) && ((rlc_pP->c_pdu_without_poll >= rlc_pP->poll_pdu) ||
    (rlc_pP->c_byte_without_poll >= rlc_pP->poll_byte))) ||
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    ((rlc_pP->sdu_buffer_occupancy == 0) && (rlc_pP->retrans_num_bytes_to_retransmit == 0)) ||
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    (rlc_pP->vt_s == rlc_pP->vt_ms) ||
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    (rlc_pP->force_poll == true)
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  ) {
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	rlc_pP->force_poll = false;
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    if ((is_new_pdu) && (rlc_pP->c_pdu_without_poll >= rlc_pP->poll_pdu)) {
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      LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[POLL] SET POLL BECAUSE TX NUM PDU THRESHOLD %d  HAS BEEN REACHED\n",
            PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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            rlc_pP->poll_pdu);
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    }
    if ((is_new_pdu) && (rlc_pP->c_byte_without_poll >= rlc_pP->poll_byte)) {
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      LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[POLL] SET POLL BECAUSE TX NUM BYTES THRESHOLD %d  HAS BEEN REACHED\n",
            PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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            rlc_pP->poll_byte);
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    }
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    if ((rlc_pP->sdu_buffer_occupancy == 0) && (rlc_pP->retrans_num_bytes_to_retransmit == 0)) {
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      LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[POLL] SET POLL BECAUSE TX BUFFERS ARE EMPTY\n",
            PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP));
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    }
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    if (rlc_pP->vt_s == rlc_pP->vt_ms) {
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      LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[POLL] SET POLL BECAUSE OF WINDOW STALLING\n",
            PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP));
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    }
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    RLC_AM_PDU_SET_POLL(pdu_pP->b1);
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    rlc_pP->c_pdu_without_poll     = 0;
    rlc_pP->c_byte_without_poll    = 0;

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    // vt_s shall have been updated before in case of new transmission
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    rlc_pP->poll_sn = RLC_AM_PREV_SN(rlc_pP->vt_s);
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    //optimisation if (!rlc_pP->t_poll_retransmit.running) {
    rlc_am_start_timer_poll_retransmit(ctxt_pP, rlc_pP);
    //optimisation } else {
    //optimisation     rlc_pP->t_poll_retransmit.frame_time_out = ctxt_pP->frame + rlc_pP->t_poll_retransmit.time_out;
    //optimisation }
  } else {
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	  // Need to clear poll bit as it may be a copy(retransmission case) of the original RLC PDU which was containing a poll
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	RLC_AM_PDU_CLEAR_POLL(pdu_pP->b1);
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  }
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}
//-----------------------------------------------------------------------------
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void rlc_am_segment_10 (
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  const protocol_ctxt_t* const  ctxt_pP,
  rlc_am_entity_t *const rlc_pP)
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{
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  list_t              pdus;
  sdu_size_t          pdu_remaining_size      = 0;
  sdu_size_t          test_pdu_remaining_size = 0;

  sdu_size_t                       nb_bytes_to_transmit = rlc_pP->nb_bytes_requested_by_mac;
  rlc_am_pdu_sn_10_t              *pdu_p        = NULL;
  struct mac_tb_req               *pdu_tb_req_p = NULL;
  mem_block_t                     *pdu_mem_p    = NULL;
  unsigned char                   *data         = NULL;
  unsigned char                   *data_sdu_p   = NULL;
  rlc_am_e_li_t                   *e_li_p       = NULL;
  rlc_am_tx_sdu_management_t      *sdu_mngt_p   = NULL;
  rlc_am_tx_data_pdu_management_t *pdu_mngt_p   = NULL;

  sdu_size_t         li_length_in_bytes         = 0;
  sdu_size_t         test_li_length_in_bytes    = 0;
  sdu_size_t         test_remaining_size_to_substract= 0;
  unsigned int       test_remaining_num_li_to_substract = 0;
  unsigned int       continue_fill_pdu_with_sdu         = 0;
  unsigned int       num_fill_sdu                       = 0;
  unsigned int       test_num_li                        = 0;
  unsigned int       fill_num_li                        = 0;
  unsigned int       sdu_buffer_index                   = 0;
  sdu_size_t         data_pdu_size                      = 0;

  unsigned int       fi_first_byte_pdu_is_first_byte_sdu = 0;
  unsigned int       fi_last_byte_pdu_is_last_byte_sdu   = 0;
  unsigned int       fi                                  = 0;
  signed int         max_li_overhead                     = 0;

  LOG_T(RLC,
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        PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] rlc_pP->current_sdu_index %d rlc_pP->next_sdu_index %d rlc_pP->input_sdus[rlc_pP->current_sdu_index].mem_block %p sdu_buffer_occupancy %d\n",
        PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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        rlc_pP->current_sdu_index,
        rlc_pP->next_sdu_index,
        rlc_pP->input_sdus[rlc_pP->current_sdu_index].mem_block,
        rlc_pP->sdu_buffer_occupancy);

  if (rlc_pP->sdu_buffer_occupancy <= 0) {
    return;
  }

  //msg ("[FRAME %05d][%s][RLC_AM][MOD %u/%u][RB %u][SEGMENT]\n", rlc_pP->module_id, rlc_pP->rb_id, ctxt_pP->frame);
  list_init (&pdus, NULL);    // param string identifying the list is NULL
  pdu_mem_p = NULL;


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  RLC_AM_MUTEX_LOCK(&rlc_pP->lock_input_sdus, ctxt_pP, rlc_pP);
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  while ((rlc_pP->input_sdus[rlc_pP->current_sdu_index].mem_block) && (nb_bytes_to_transmit > 0) ) {
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    LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] nb_bytes_to_transmit %d BO %d\n",
          PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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          nb_bytes_to_transmit,
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          rlc_pP->sdu_buffer_occupancy);
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    // pdu_p management
    if (!pdu_mem_p) {
      if (rlc_pP->nb_sdu_no_segmented <= 1) {
        max_li_overhead = 0;
      } else {
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    	/* This computation assumes there is no SDU with size greater than 2047 bytes, otherwise a new PDU must be built except for LI15 configuration from Rel12*/
    	test_num_li = rlc_pP->nb_sdu_no_segmented - 1;
        max_li_overhead = test_num_li + (test_num_li >> 1) + (test_num_li & 1);
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      }

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      LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] max_li_overhead %d\n",
            PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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            max_li_overhead);

      if  (nb_bytes_to_transmit >= (rlc_pP->sdu_buffer_occupancy + RLC_AM_HEADER_MIN_SIZE + max_li_overhead)) {
        data_pdu_size = rlc_pP->sdu_buffer_occupancy + RLC_AM_HEADER_MIN_SIZE + max_li_overhead;
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        LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] alloc PDU size %d bytes to contain not all bytes requested by MAC but all BO of RLC@1\n",
              PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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              data_pdu_size);
      } else {
        data_pdu_size = nb_bytes_to_transmit;
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        LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] alloc PDU size %d bytes to contain all bytes requested by MAC@1\n",
              PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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              data_pdu_size);
      }

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      if (!(pdu_mem_p = get_free_mem_block (data_pdu_size + sizeof(struct mac_tb_req), __func__))) {
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        LOG_C(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] ERROR COULD NOT GET NEW PDU, EXIT\n",
              PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP));
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        RLC_AM_MUTEX_UNLOCK(&rlc_pP->lock_input_sdus);
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        return;
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      }

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      LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] get new PDU %d bytes\n",
            PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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            data_pdu_size);
      pdu_remaining_size = data_pdu_size - RLC_AM_HEADER_MIN_SIZE;
      pdu_p        = (rlc_am_pdu_sn_10_t*) (&pdu_mem_p->data[sizeof(struct mac_tb_req)]);
      pdu_tb_req_p = (struct mac_tb_req*) (pdu_mem_p->data);
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      pdu_mngt_p   = &rlc_pP->tx_data_pdu_buffer[rlc_pP->vt_s % RLC_AM_PDU_RETRANSMISSION_BUFFER_SIZE];
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      memset(pdu_mngt_p, 0, sizeof (rlc_am_tx_data_pdu_management_t));

      memset (pdu_mem_p->data, 0, sizeof (rlc_am_pdu_sn_10_t)+sizeof(struct mac_tb_req));
      li_length_in_bytes = 1;
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    }

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    //----------------------------------------
    // compute how many SDUS can fill the PDU
    //----------------------------------------
    continue_fill_pdu_with_sdu = 1;
    num_fill_sdu               = 0;
    test_num_li                = 0;
    sdu_buffer_index           = rlc_pP->current_sdu_index;
    test_pdu_remaining_size    = pdu_remaining_size;
    test_li_length_in_bytes    = 1;
    test_remaining_size_to_substract   = 0;
    test_remaining_num_li_to_substract = 0;


    while ((rlc_pP->input_sdus[sdu_buffer_index].mem_block) && (continue_fill_pdu_with_sdu > 0)) {
      sdu_mngt_p = &rlc_pP->input_sdus[sdu_buffer_index];

      if (sdu_mngt_p->sdu_remaining_size > test_pdu_remaining_size) {
        // no LI
        continue_fill_pdu_with_sdu = 0;
        num_fill_sdu += 1;
        test_pdu_remaining_size = 0;
        test_remaining_size_to_substract = 0;
        test_remaining_num_li_to_substract = 0;
      } else if (sdu_mngt_p->sdu_remaining_size == test_pdu_remaining_size) {
        // fi will indicate end of PDU is end of SDU, no need for LI
        continue_fill_pdu_with_sdu = 0;
        num_fill_sdu += 1;
        test_pdu_remaining_size = 0;
        test_remaining_size_to_substract = 0;
        test_remaining_num_li_to_substract = 0;
      } else if ((sdu_mngt_p->sdu_remaining_size + (test_li_length_in_bytes ^ 3)) == test_pdu_remaining_size ) {
        // no LI
        continue_fill_pdu_with_sdu = 0;
        num_fill_sdu += 1;
        test_pdu_remaining_size = 0;
        test_remaining_size_to_substract = 0;
        test_remaining_num_li_to_substract = 0;
        pdu_remaining_size = pdu_remaining_size - (test_li_length_in_bytes ^ 3);
      } else if ((sdu_mngt_p->sdu_remaining_size + (test_li_length_in_bytes ^ 3)) < test_pdu_remaining_size ) {
        if (pdu_mngt_p->nb_sdus >= (RLC_AM_MAX_SDU_IN_PDU-1)) {
          continue_fill_pdu_with_sdu = 0;
          //num_fill_sdu += 1;
          test_pdu_remaining_size = 0;
          test_remaining_size_to_substract = 0;
          test_remaining_num_li_to_substract = 0;
          pdu_remaining_size = pdu_remaining_size - 1;
        } else {
          test_num_li += 1;
          num_fill_sdu += 1;
          test_pdu_remaining_size = test_pdu_remaining_size - (sdu_mngt_p->sdu_remaining_size + (test_li_length_in_bytes ^ 3));
          test_remaining_size_to_substract = test_li_length_in_bytes ^ 3;
          test_remaining_num_li_to_substract = 1;
          test_li_length_in_bytes = test_li_length_in_bytes ^ 3;
        }
      } else {
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        LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] sdu_mngt_p->sdu_remaining_size=%d test_pdu_remaining_size=%d test_li_length_in_bytes=%d\n",
              PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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              sdu_mngt_p->sdu_remaining_size,
              test_pdu_remaining_size,
              test_li_length_in_bytes ^ 3);
        // reduce the size of the PDU
        continue_fill_pdu_with_sdu = 0;
        num_fill_sdu += 1;
        test_pdu_remaining_size = 0;
        test_remaining_size_to_substract = 0;
        test_remaining_num_li_to_substract = 0;
        pdu_remaining_size = pdu_remaining_size - 1;
      }

      pdu_mngt_p->sdus_index[pdu_mngt_p->nb_sdus++] = sdu_buffer_index;
      sdu_mngt_p->pdus_index[sdu_mngt_p->nb_pdus++] = rlc_pP->vt_s % RLC_AM_PDU_RETRANSMISSION_BUFFER_SIZE;
      assert(sdu_mngt_p->nb_pdus < RLC_AM_MAX_SDU_FRAGMENTS);
      sdu_buffer_index = (sdu_buffer_index + 1) % RLC_AM_SDU_CONTROL_BUFFER_SIZE;
    }

    if (test_remaining_num_li_to_substract > 0) {
      // there is a LI that is not necessary
      test_num_li = test_num_li - 1;
      pdu_remaining_size = pdu_remaining_size - test_remaining_size_to_substract;
    }

    //----------------------------------------
    // Do the real filling of the pdu_p
    //----------------------------------------
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    LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT" data shift %d Bytes num_li %d\n",
          PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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          ((test_num_li*3) +1) >> 1,
          test_num_li);
    data = ((unsigned char*)(&pdu_p->data[((test_num_li*3) +1) >> 1]));
    pdu_mngt_p->payload = data;
    e_li_p = (rlc_am_e_li_t*)(pdu_p->data);
    continue_fill_pdu_with_sdu          = 1;
    li_length_in_bytes                  = 1;
    fill_num_li                         = 0;
    fi_first_byte_pdu_is_first_byte_sdu = 0;
    fi_last_byte_pdu_is_last_byte_sdu   = 0;

    if (rlc_pP->input_sdus[rlc_pP->current_sdu_index].sdu_remaining_size ==
        rlc_pP->input_sdus[rlc_pP->current_sdu_index].sdu_size) {
      fi_first_byte_pdu_is_first_byte_sdu = 1;
    }
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    while ((rlc_pP->input_sdus[rlc_pP->current_sdu_index].mem_block) && (continue_fill_pdu_with_sdu > 0)) {
      sdu_mngt_p = &rlc_pP->input_sdus[rlc_pP->current_sdu_index];
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      if (sdu_mngt_p->sdu_segmented_size == 0) {
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        LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] GET NEW SDU %p AVAILABLE SIZE %d Bytes\n",
              PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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              sdu_mngt_p,
              sdu_mngt_p->sdu_remaining_size);
      } else {
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        LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] GET AGAIN SDU %p REMAINING AVAILABLE SIZE %d Bytes / %d Bytes LENGTH \n",
              PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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              sdu_mngt_p,
              sdu_mngt_p->sdu_remaining_size,
              sdu_mngt_p->sdu_size);
      }

      data_sdu_p = &sdu_mngt_p->first_byte[sdu_mngt_p->sdu_segmented_size];

      if (sdu_mngt_p->sdu_remaining_size > pdu_remaining_size) {
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        LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] Filling all remaining PDU with %d bytes\n",
              PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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              pdu_remaining_size);
        //msg ("[FRAME %05d][%s][RLC_AM][MOD %u/%u][RB %u][SEGMENT] pdu_mem_p %p pdu_p %p pdu_p->data %p data %p data_sdu_p %p pdu_remaining_size %d\n", rlc_pP->module_id, rlc_pP->rb_id, ctxt_pP->frame, pdu_mem_p, pdu_p, pdu_p->data, data, data_sdu_p,pdu_remaining_size);

        memcpy(data, data_sdu_p, pdu_remaining_size);
        pdu_mngt_p->payload_size += pdu_remaining_size;
        sdu_mngt_p->sdu_remaining_size = sdu_mngt_p->sdu_remaining_size - pdu_remaining_size;
        sdu_mngt_p->sdu_segmented_size = sdu_mngt_p->sdu_segmented_size + pdu_remaining_size;
        fi_last_byte_pdu_is_last_byte_sdu = 0;
        // no LI
        rlc_pP->sdu_buffer_occupancy -= pdu_remaining_size;
        continue_fill_pdu_with_sdu = 0;
        pdu_remaining_size = 0;
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        LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] sdu_remaining_size %d bytes sdu_segmented_size %d bytes\n",
              PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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              sdu_mngt_p->sdu_remaining_size,
              sdu_mngt_p->sdu_segmented_size);
      } else if (sdu_mngt_p->sdu_remaining_size == pdu_remaining_size) {
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        LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] Exactly Filling remaining PDU with %d remaining bytes of SDU\n",
              PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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              pdu_remaining_size);
        memcpy(data, data_sdu_p, pdu_remaining_size);
        pdu_mngt_p->payload_size += pdu_remaining_size;

        // free SDU
        rlc_pP->sdu_buffer_occupancy -= sdu_mngt_p->sdu_remaining_size;
        rlc_am_free_in_sdu_data(ctxt_pP, rlc_pP, rlc_pP->current_sdu_index);
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        //free_mem_block (rlc_pP->input_sdus[rlc_pP->current_sdu_index], __func__);
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        //rlc_pP->input_sdus[rlc_pP->current_sdu_index] = NULL;
        //rlc_pP->nb_sdu -= 1;
        rlc_pP->current_sdu_index = (rlc_pP->current_sdu_index + 1) % RLC_AM_SDU_CONTROL_BUFFER_SIZE;

        fi_last_byte_pdu_is_last_byte_sdu = 1;
        // fi will indicate end of PDU is end of SDU, no need for LI
        continue_fill_pdu_with_sdu = 0;
        pdu_remaining_size = 0;
      } else if ((sdu_mngt_p->sdu_remaining_size + (li_length_in_bytes ^ 3)) < pdu_remaining_size ) {
        if (fill_num_li == (RLC_AM_MAX_SDU_IN_PDU - 1)) {
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          LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] [SIZE %d] REACHING RLC_AM_MAX_SDU_IN_PDU LIs -> STOP SEGMENTATION FOR THIS PDU SDU\n",
                PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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                sdu_mngt_p->sdu_remaining_size);
          memcpy(data, data_sdu_p, sdu_mngt_p->sdu_remaining_size);
          pdu_mngt_p->payload_size += sdu_mngt_p->sdu_remaining_size;
          pdu_remaining_size = 0; //Forced to 0 pdu_remaining_size - sdu_mngt_p->sdu_remaining_size;
          // free SDU
          rlc_pP->sdu_buffer_occupancy -= sdu_mngt_p->sdu_remaining_size;
          rlc_am_free_in_sdu_data(ctxt_pP, rlc_pP, rlc_pP->current_sdu_index);
          //rlc_pP->input_sdus[rlc_pP->current_sdu_index] = NULL;
          //rlc_pP->nb_sdu -= 1;
          rlc_pP->current_sdu_index = (rlc_pP->current_sdu_index + 1) % RLC_AM_SDU_CONTROL_BUFFER_SIZE;

          // reduce the size of the PDU
          continue_fill_pdu_with_sdu = 0;
          fi_last_byte_pdu_is_last_byte_sdu = 1;
        } else {
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          LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] Filling  PDU with %d all remaining bytes of SDU\n",
                PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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                sdu_mngt_p->sdu_remaining_size);
          memcpy(data, data_sdu_p, sdu_mngt_p->sdu_remaining_size);
          pdu_mngt_p->payload_size += sdu_mngt_p->sdu_remaining_size;
          data = &data[sdu_mngt_p->sdu_remaining_size];
          li_length_in_bytes = li_length_in_bytes ^ 3;
          fill_num_li += 1;

          if (li_length_in_bytes  == 2) {
            if (fill_num_li == test_num_li) {
              //e_li_p->e1  = 0;
              e_li_p->b1 = 0;
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            } else {
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              //e_li_p->e1  = 1;
              e_li_p->b1 =  0x80;
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            }
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            //e_li_p->li1 = sdu_mngt_p->sdu_remaining_size;
            e_li_p->b1 = e_li_p->b1 | (sdu_mngt_p->sdu_remaining_size >> 4);
            e_li_p->b2 = sdu_mngt_p->sdu_remaining_size << 4;
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            LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] set e_li_p->b1=0x%02X set e_li_p->b2=0x%02X fill_num_li=%d test_num_li=%d\n",
                  PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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                  e_li_p->b1,
                  e_li_p->b2,
                  fill_num_li,
                  test_num_li);
          } else {
            if (fill_num_li != test_num_li) {
              //e_li_p->e2  = 1;
              e_li_p->b2  = e_li_p->b2 | 0x08;
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            }
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            //e_li_p->li2 = sdu_mngt_p->sdu_remaining_size;
            e_li_p->b2 = e_li_p->b2 | (sdu_mngt_p->sdu_remaining_size >> 8);
            e_li_p->b3 = sdu_mngt_p->sdu_remaining_size & 0xFF;
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            LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] set e_li_p->b2=0x%02X set e_li_p->b3=0x%02X fill_num_li=%d test_num_li=%d\n",
                  PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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                  e_li_p->b2,
                  e_li_p->b3,
                  fill_num_li,
                  test_num_li);
            e_li_p++;
          }

          pdu_remaining_size = pdu_remaining_size - (sdu_mngt_p->sdu_remaining_size + li_length_in_bytes);
          // free SDU
          rlc_pP->sdu_buffer_occupancy  -= sdu_mngt_p->sdu_remaining_size;
          sdu_mngt_p->sdu_remaining_size = 0;

          rlc_am_free_in_sdu_data(ctxt_pP, rlc_pP, rlc_pP->current_sdu_index);
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          //free_mem_block (rlc_pP->input_sdus[rlc_pP->current_sdu_index], __func__);
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          //rlc_pP->input_sdus[rlc_pP->current_sdu_index] = NULL;
          //rlc_pP->nb_sdu -= 1;
          rlc_pP->current_sdu_index = (rlc_pP->current_sdu_index + 1) % RLC_AM_SDU_CONTROL_BUFFER_SIZE;
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        }
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      } else {
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        LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] Filling  PDU with %d all remaining bytes of SDU and reduce TB size by %d bytes\n",
              PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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              sdu_mngt_p->sdu_remaining_size,
              pdu_remaining_size - sdu_mngt_p->sdu_remaining_size);
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#if USER_MODE
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        assert(1!=1);
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#endif
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        memcpy(data, data_sdu_p, sdu_mngt_p->sdu_remaining_size);
        pdu_mngt_p->payload_size += sdu_mngt_p->sdu_remaining_size;
        pdu_remaining_size = pdu_remaining_size - sdu_mngt_p->sdu_remaining_size;
        // free SDU
        rlc_pP->sdu_buffer_occupancy -= sdu_mngt_p->sdu_remaining_size;
        rlc_am_free_in_sdu_data(ctxt_pP, rlc_pP, rlc_pP->current_sdu_index);
        //rlc_pP->input_sdus[rlc_pP->current_sdu_index] = NULL;
        //rlc_pP->nb_sdu -= 1;
        rlc_pP->current_sdu_index = (rlc_pP->current_sdu_index + 1) % RLC_AM_SDU_CONTROL_BUFFER_SIZE;

        // reduce the size of the PDU
        continue_fill_pdu_with_sdu = 0;
        fi_last_byte_pdu_is_last_byte_sdu = 1;
      }
    }
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    // set framing info
    if (fi_first_byte_pdu_is_first_byte_sdu) {
      fi = 0;
    } else {
      fi = 2;
    }
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    if (!fi_last_byte_pdu_is_last_byte_sdu) {
      fi = fi + 1;
    }

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    pdu_p->b1 = pdu_p->b1 | (fi << RLC_AM_PDU_FI_OFFSET);
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    // set fist e bit
    if (fill_num_li > 0) {
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    	RLC_AM_PDU_SET_E(pdu_p->b1);
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    }

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    LOG_T(RLC, PROTOCOL_RLC_AM_CTXT_FMT"[SEGMENT] SEND PDU SN %04d  SIZE %d BYTES PAYLOAD SIZE %d BYTES\n",
          PROTOCOL_RLC_AM_CTXT_ARGS(ctxt_pP,rlc_pP),
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          rlc_pP->vt_s,
          data_pdu_size - pdu_remaining_size,
          pdu_mngt_p->payload_size);

    rlc_pP->stat_tx_data_pdu   += 1;
    rlc_pP->stat_tx_data_bytes += (data_pdu_size - pdu_remaining_size);

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    // set DATA/CONTROL field is DATA PDU(1)
    RLC_AM_PDU_SET_D_C(pdu_p->b1);
    // set sn = rlc_pP->vt_s;
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    pdu_p->b1 = pdu_p->b1 | (rlc_pP->vt_s >> 8);
    pdu_p->b2 = rlc_pP->vt_s & 0xFF;
    rlc_pP->vt_s = (rlc_pP->vt_s+1) & RLC_AM_SN_MASK;

    pdu_tb_req_p->data_ptr        = (unsigned char*)pdu_p;
    pdu_tb_req_p->tb_size         = data_pdu_size - pdu_remaining_size;
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//#warning "why 3000: changed to RLC_SDU_MAX_SIZE "
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    assert(pdu_tb_req_p->tb_size < RLC_SDU_MAX_SIZE );
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    rlc_am_pdu_polling(ctxt_pP, rlc_pP, pdu_p, pdu_mngt_p->payload_size,true);
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    //list_add_tail_eurecom (pdu_mem_p, &rlc_pP->segmentation_pdu_list);
    pdu_mngt_p->mem_block  = pdu_mem_p;
    pdu_mngt_p->first_byte = (unsigned char*)pdu_p;
    pdu_mngt_p->header_and_payload_size  = data_pdu_size - pdu_remaining_size;
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    pdu_mngt_p->retx_count = 0;
    pdu_mngt_p->retx_count_next = 0;
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    pdu_mngt_p->flags.retransmit = 0;
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    pdu_mngt_p->flags.transmitted = 1;
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    //TBC: What for resetting local pointers at the end ??
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    pdu_p = NULL;
    pdu_mem_p = NULL;
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    //nb_bytes_to_transmit = nb_bytes_to_transmit - data_pdu_size;
    nb_bytes_to_transmit = 0; // 1 PDU only
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    /* We need to copy the PDU to pass to MAC in order to keep it in the buffer for potential retransmissions */
    mem_block_t* copy = rlc_am_retransmit_get_copy (ctxt_pP, rlc_pP, RLC_AM_PREV_SN(rlc_pP->vt_s));
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    list_add_tail_eurecom (copy, &rlc_pP->segmentation_pdu_list);
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  }
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  RLC_AM_MUTEX_UNLOCK(&rlc_pP->lock_input_sdus);
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}