rlc_um_segment.c 42.2 KB
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/*******************************************************************************

Eurecom OpenAirInterface 2
Copyright(c) 1999 - 2010 Eurecom

This program is free software; you can redistribute it and/or modify it
under the terms and conditions of the GNU General Public License,
version 2, as published by the Free Software Foundation.

This program is distributed in the hope it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
more details.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

The full GNU General Public License is included in this distribution in
the file called "COPYING".

Contact Information
Openair Admin: openair_admin@eurecom.fr
Openair Tech : openair_tech@eurecom.fr
Forums       : http://forums.eurecom.fsr/openairinterface
Address      : Eurecom, 2229, route des crêtes, 06560 Valbonne Sophia Antipolis, France

*******************************************************************************/
#define RLC_UM_MODULE
#define RLC_UM_SEGMENT_C
//-----------------------------------------------------------------------------
#include "platform_types.h"
#include "platform_constants.h"
//-----------------------------------------------------------------------------
#ifdef USER_MODE
#include <assert.h>
#endif
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#include "assertions.h"
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#include "list.h"
#include "rlc_um.h"
#include "rlc_primitives.h"
#include "MAC_INTERFACE/extern.h"
#include "UTIL/LOG/log.h"

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//#define TRACE_RLC_UM_SEGMENT 1
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//-----------------------------------------------------------------------------
void
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rlc_um_segment_10 (struct rlc_um_entity *rlc_pP,frame_t frameP)
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{
//-----------------------------------------------------------------------------
    list_t              pdus;
    signed int          pdu_remaining_size;
    signed int          test_pdu_remaining_size;

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    int                 nb_bytes_to_transmit = rlc_pP->nb_bytes_requested_by_mac;
    rlc_um_pdu_sn_10_t *pdu_p;
    struct mac_tb_req  *pdu_tb_req_p;
    mem_block_t        *pdu_mem_p;
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    char               *data;
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    char               *data_sdu_p;
    rlc_um_e_li_t      *e_li_p;
    struct rlc_um_tx_sdu_management *sdu_mngt_p;
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    unsigned int       li_length_in_bytes;
    unsigned int       test_li_length_in_bytes;
    unsigned int       test_remaining_size_to_substract;
    unsigned int       test_remaining_num_li_to_substract;
    unsigned int       continue_fill_pdu_with_sdu;
    unsigned int       num_fill_sdu;
    unsigned int       test_num_li;
    unsigned int       fill_num_li;
    unsigned int       sdu_buffer_index;
    unsigned int       data_pdu_size;

    unsigned int       fi_first_byte_pdu_is_first_byte_sdu;
    unsigned int       fi_last_byte_pdu_is_last_byte_sdu;
    unsigned int       fi;
    unsigned int       max_li_overhead;

    if (nb_bytes_to_transmit < 3) {
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#if defined(TRACE_RLC_UM_SEGMENT)
        LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] NO SEGMENTATION nb_bytes to transmit = %d\n",
                frameP,
                (rlc_pP->is_enb) ? "eNB" : "UE",
                rlc_pP->enb_module_id,
                rlc_pP->ue_module_id,
                rlc_pP->rb_id,
                nb_bytes_to_transmit);
#endif
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        return;
    }
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#if defined(TRACE_RLC_UM_SEGMENT)
    LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT10\n", rlc_pP->module_id, rlc_pP->rb_id, frameP);
#endif
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    list_init (&pdus, NULL);    // param string identifying the list is NULL
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    pdu_mem_p = NULL;

    while ((rlc_pP->input_sdus[rlc_pP->current_sdu_index]) && (nb_bytes_to_transmit > 0)) {
#if defined(TRACE_RLC_UM_SEGMENT)
        LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT10 nb_bytes_to_transmit %d BO %d\n",
                frameP,
                (rlc_pP->is_enb) ? "eNB" : "UE",
                rlc_pP->enb_module_id,
                rlc_pP->ue_module_id,
                rlc_pP->rb_id,
                nb_bytes_to_transmit,
                rlc_pP->buffer_occupancy);
#endif
        // pdu_p management
        if (!pdu_mem_p) {
            if (rlc_pP->nb_sdu <= 1) {
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                max_li_overhead = 0;
            } else {
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                max_li_overhead = (((rlc_pP->nb_sdu - 1) * 3) / 2) + ((rlc_pP->nb_sdu - 1) % 2);
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            }
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            if  (nb_bytes_to_transmit >= (rlc_pP->buffer_occupancy + rlc_pP->tx_header_min_length_in_bytes + max_li_overhead)) {
                data_pdu_size = rlc_pP->buffer_occupancy + rlc_pP->tx_header_min_length_in_bytes + max_li_overhead;
#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT10 alloc PDU size %d bytes to contain not all bytes requested by MAC but all BO of RLC@1\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        data_pdu_size);
#endif
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            } else {
                data_pdu_size = nb_bytes_to_transmit;
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#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT10 alloc PDU size %d bytes to contain all bytes requested by MAC@1\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        data_pdu_size);
#endif
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            }
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            if (!(pdu_mem_p = get_free_mem_block (data_pdu_size + sizeof(struct mac_tb_req)))) {
#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_E(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT10 ERROR COULD NOT GET NEW PDU, EXIT\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id);
#endif
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                return;
            }
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#if defined(TRACE_RLC_UM_SEGMENT)
            LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT10 get new PDU %d bytes\n",
                    frameP,
                    (rlc_pP->is_enb) ? "eNB" : "UE",
                    rlc_pP->enb_module_id,
                    rlc_pP->ue_module_id,
                    rlc_pP->rb_id,
                    data_pdu_size);
#endif
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            pdu_remaining_size = data_pdu_size - 2;
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            pdu_p        = (rlc_um_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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            memset (pdu_mem_p->data, 0, sizeof (rlc_um_pdu_sn_10_t)+sizeof(struct mac_tb_req));
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            li_length_in_bytes = 1;
        }
        //----------------------------------------
        // compute how many SDUS can fill the PDU
        //----------------------------------------
        continue_fill_pdu_with_sdu = 1;
        num_fill_sdu               = 0;
        test_num_li                = 0;
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        sdu_buffer_index           = rlc_pP->current_sdu_index;
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        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;


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        while ((rlc_pP->input_sdus[sdu_buffer_index]) && (continue_fill_pdu_with_sdu > 0)) {
            sdu_mngt_p = ((struct rlc_um_tx_sdu_management *) (rlc_pP->input_sdus[sdu_buffer_index]->data));
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            if (sdu_mngt_p->sdu_remaining_size > test_pdu_remaining_size) {
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                // 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;
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            } else if (sdu_mngt_p->sdu_remaining_size == test_pdu_remaining_size) {
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                // 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;
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            } else if ((sdu_mngt_p->sdu_remaining_size + (test_li_length_in_bytes ^ 3)) == test_pdu_remaining_size ) {
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                // 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);
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            } else if ((sdu_mngt_p->sdu_remaining_size + (test_li_length_in_bytes ^ 3)) < test_pdu_remaining_size ) {
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                test_num_li += 1;
                num_fill_sdu += 1;
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                test_pdu_remaining_size = test_pdu_remaining_size - (sdu_mngt_p->sdu_remaining_size + (test_li_length_in_bytes ^ 3));
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                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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#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT10 sdu_mngt_p->sdu_remaining_size=%d test_pdu_remaining_size=%d test_li_length_in_bytes=%d\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        sdu_mngt_p->sdu_remaining_size,
                        test_pdu_remaining_size,
                        test_li_length_in_bytes ^ 3);
#endif
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                // 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;
            }
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            sdu_buffer_index = (sdu_buffer_index + 1) % rlc_pP->size_input_sdus_buffer;
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        }
        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;
        }
        //----------------------------------------
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        // Do the real filling of the pdu_p
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        //----------------------------------------
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#if defined(TRACE_RLC_UM_SEGMENT)
        LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] data shift %d Bytes num_li %d\n",
                frameP,
                (rlc_pP->is_enb) ? "eNB" : "UE",
                rlc_pP->enb_module_id,
                rlc_pP->ue_module_id,
                rlc_pP->rb_id,
                ((test_num_li*3) +1) >> 1,
                test_num_li);
#endif
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        data = ((char*)(&pdu_p->data[((test_num_li*3) +1) >> 1]));
        e_li_p = (rlc_um_e_li_t*)(pdu_p->data);
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        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 (
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            ((struct rlc_um_tx_sdu_management *) (rlc_pP->input_sdus[rlc_pP->current_sdu_index]->data))->sdu_remaining_size ==
            ((struct rlc_um_tx_sdu_management *) (rlc_pP->input_sdus[rlc_pP->current_sdu_index]->data))->sdu_size) {
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            fi_first_byte_pdu_is_first_byte_sdu = 1;
        }
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        while ((rlc_pP->input_sdus[rlc_pP->current_sdu_index]) && (continue_fill_pdu_with_sdu > 0)) {
            sdu_mngt_p = ((struct rlc_um_tx_sdu_management *) (rlc_pP->input_sdus[rlc_pP->current_sdu_index]->data));
            if (sdu_mngt_p->sdu_segmented_size == 0) {
#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT10 GET NEW SDU %p AVAILABLE SIZE %d Bytes\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        sdu_mngt_p,
                        sdu_mngt_p->sdu_remaining_size);
#endif
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            } else {
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#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT10 GET AGAIN SDU %p REMAINING AVAILABLE SIZE %d Bytes / %d Bytes \n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        sdu_mngt_p,
                        sdu_mngt_p->sdu_remaining_size,
                        sdu_mngt_p->sdu_size);
#endif
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            }
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            data_sdu_p = &((rlc_pP->input_sdus[rlc_pP->current_sdu_index])->data[sizeof (struct rlc_um_tx_sdu_management) + sdu_mngt_p->sdu_segmented_size]);

            if (sdu_mngt_p->sdu_remaining_size > pdu_remaining_size) {
#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT10 Filling all remaining PDU with %d bytes\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        pdu_remaining_size);
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT10 pdu_mem_p %p pdu_mem_p->data %p pdu_p %p pdu_p->data %p data %p data_sdu_p %p pdu_remaining_size %d\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        pdu_mem_p,
                        pdu_mem_p->data,
                        pdu_p,
                        pdu_p->data,
                        data,
                        data_sdu_p,
                        pdu_remaining_size);
#endif

                memcpy(data, data_sdu_p, 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;
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                fi_last_byte_pdu_is_last_byte_sdu = 0;
                // no LI
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                rlc_pP->buffer_occupancy -= pdu_remaining_size;
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                continue_fill_pdu_with_sdu = 0;
                pdu_remaining_size = 0;
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            } else if (sdu_mngt_p->sdu_remaining_size == pdu_remaining_size) {
#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT10 Exactly Filling remaining PDU with %d remaining bytes of SDU\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        pdu_remaining_size);
#endif
                memcpy(data, data_sdu_p, pdu_remaining_size);
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                // free SDU
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                rlc_pP->buffer_occupancy -= sdu_mngt_p->sdu_remaining_size;
                free_mem_block (rlc_pP->input_sdus[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_pP->size_input_sdus_buffer;
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                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;
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            } else if ((sdu_mngt_p->sdu_remaining_size + (li_length_in_bytes ^ 3)) < pdu_remaining_size ) {
#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT10 Filling  PDU with %d all remaining bytes of SDU\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        sdu_mngt_p->sdu_remaining_size);
#endif
                memcpy(data, data_sdu_p, sdu_mngt_p->sdu_remaining_size);
                data = &data[sdu_mngt_p->sdu_remaining_size];
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                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) {
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                        //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;
#if defined(TRACE_RLC_UM_SEGMENT)
                    LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT10 set e_li_p->b1=%02X set e_li_p->b2=%02X fill_num_li=%d test_num_li=%d\n",
                            frameP,
                            (rlc_pP->is_enb) ? "eNB" : "UE",
                            rlc_pP->enb_module_id,
                            rlc_pP->ue_module_id,
                            rlc_pP->rb_id,
                            e_li_p->b1,
                            e_li_p->b2,
                            fill_num_li,
                            test_num_li);
#endif
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                } else {
                    if (fill_num_li != test_num_li) {
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                        //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;
#if defined(TRACE_RLC_UM_SEGMENT)
                    LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT10 set e_li_p->b2=%02X set e_li_p->b3=%02X fill_num_li=%d test_num_li=%d\n",
                            frameP,
                            (rlc_pP->is_enb) ? "eNB" : "UE",
                            rlc_pP->enb_module_id,
                            rlc_pP->ue_module_id,
                            rlc_pP->rb_id,
                            e_li_p->b2,
                            e_li_p->b3,
                            fill_num_li,
                            test_num_li);
#endif
                    e_li_p++;
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                }

                // free SDU
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                rlc_pP->buffer_occupancy -= sdu_mngt_p->sdu_remaining_size;
                free_mem_block (rlc_pP->input_sdus[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_pP->size_input_sdus_buffer;
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                pdu_remaining_size = pdu_remaining_size - (sdu_mngt_p->sdu_remaining_size + li_length_in_bytes);
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            } else {
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#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT10 Filling  PDU with %d all remaining bytes of SDU and reduce TB size by %d bytes\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        sdu_mngt_p->sdu_remaining_size,
                        pdu_remaining_size - sdu_mngt_p->sdu_remaining_size);
#endif
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#ifdef USER_MODE
                assert(1!=1);
#endif
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                memcpy(data, data_sdu_p, sdu_mngt_p->sdu_remaining_size);
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                // free SDU
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                rlc_pP->buffer_occupancy -= sdu_mngt_p->sdu_remaining_size;
                free_mem_block (rlc_pP->input_sdus[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_pP->size_input_sdus_buffer;
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                // 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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                pdu_remaining_size = pdu_remaining_size - sdu_mngt_p->sdu_remaining_size;
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            }
        }

        // set framing info
        if (fi_first_byte_pdu_is_first_byte_sdu) {
            fi = 0;
        } else {
            fi = 2;
        }
        if (!fi_last_byte_pdu_is_last_byte_sdu) {
            fi = fi + 1;
        }
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        pdu_p->b1 =  (fi << 3); //pdu_p->b1 |
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        // set fist e bit
        if (fill_num_li > 0) {
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            pdu_p->b1 = pdu_p->b1 | 0x04;
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        }

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        pdu_p->b1 = pdu_p->b1 | ((rlc_pP->vt_us >> 8) & 0x03);
        pdu_p->b2 = rlc_pP->vt_us & 0xFF;
        rlc_pP->vt_us = rlc_pP->vt_us+1;
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        pdu_tb_req_p->data_ptr        = (unsigned char*)pdu_p;
        pdu_tb_req_p->tb_size = data_pdu_size - pdu_remaining_size;
        list_add_tail_eurecom (pdu_mem_p, &rlc_pP->pdus_to_mac_layer);
        //rlc_util_print_hex_octets(RLC, pdu_mem_p->data, data_pdu_size);
        AssertFatal( pdu_tb_req_p->tb_size > 0 , "SEGMENT10: FINAL RLC UM PDU LENGTH %d", pdu_tb_req_p->tb_size);
        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
    }
}
//-----------------------------------------------------------------------------
void
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rlc_um_segment_5 (struct rlc_um_entity *rlc_pP,frame_t frameP)
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{
//-----------------------------------------------------------------------------
    list_t              pdus;
    signed int          pdu_remaining_size;
    signed int          test_pdu_remaining_size;

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    int                 nb_bytes_to_transmit = rlc_pP->nb_bytes_requested_by_mac;
    rlc_um_pdu_sn_5_t  *pdu_p;
    struct mac_tb_req  *pdu_tb_req_p;
    mem_block_t        *pdu_mem_p;
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    char               *data;
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    char               *data_sdu_p;
    rlc_um_e_li_t      *e_li_p;
    struct rlc_um_tx_sdu_management *sdu_mngt_p;
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    unsigned int       li_length_in_bytes;
    unsigned int       test_li_length_in_bytes;
    unsigned int       test_remaining_size_to_substract;
    unsigned int       test_remaining_num_li_to_substract;
    unsigned int       continue_fill_pdu_with_sdu;
    unsigned int       num_fill_sdu;
    unsigned int       test_num_li;
    unsigned int       fill_num_li;
    unsigned int       sdu_buffer_index;
    unsigned int       data_pdu_size;

    unsigned int       fi_first_byte_pdu_is_first_byte_sdu;
    unsigned int       fi_last_byte_pdu_is_last_byte_sdu;
    unsigned int       fi;
    unsigned int       max_li_overhead;

    if (nb_bytes_to_transmit < 2) {
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#if defined(TRACE_RLC_UM_SEGMENT)
        LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] NO SEGMENTATION5 nb_bytes to transmit = %d\n",
                frameP,
                (rlc_pP->is_enb) ? "eNB" : "UE",
                rlc_pP->enb_module_id,
                rlc_pP->ue_module_id,
                rlc_pP->rb_id,
                nb_bytes_to_transmit);
#endif
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        return;
    }
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#if defined(TRACE_RLC_UM_SEGMENT)
    LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT5\n",
            frameP,
            (rlc_pP->is_enb) ? "eNB" : "UE",
            rlc_pP->enb_module_id,
            rlc_pP->ue_module_id,
            rlc_pP->rb_id);
#endif
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    list_init (&pdus, NULL);    // param string identifying the list is NULL
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    pdu_mem_p = NULL;

    while ((rlc_pP->input_sdus[rlc_pP->current_sdu_index]) && (nb_bytes_to_transmit > 0)) {
#if defined(TRACE_RLC_UM_SEGMENT)
        LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT5 nb_bytes_to_transmit %d BO %d\n",
                frameP,
                (rlc_pP->is_enb) ? "eNB" : "UE",
                rlc_pP->enb_module_id,
                rlc_pP->ue_module_id,
                rlc_pP->rb_id,
                nb_bytes_to_transmit,
                rlc_pP->buffer_occupancy);
#endif
        // pdu_p management
        if (!pdu_mem_p) {
            if (rlc_pP->nb_sdu <= 1) {
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                max_li_overhead = 0;
            } else {
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                max_li_overhead = (((rlc_pP->nb_sdu - 1) * 3) / 2) + ((rlc_pP->nb_sdu - 1) % 2);
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            }
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            if  (nb_bytes_to_transmit >= (rlc_pP->buffer_occupancy + rlc_pP->tx_header_min_length_in_bytes + max_li_overhead)) {
                data_pdu_size = rlc_pP->buffer_occupancy + rlc_pP->tx_header_min_length_in_bytes + max_li_overhead;
#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT5 alloc PDU size %d bytes to contain not all bytes requested by MAC but all BO of RLC@1\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        data_pdu_size);
#endif
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            } else {
                data_pdu_size = nb_bytes_to_transmit;
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#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT5 alloc PDU size %d bytes to contain all bytes requested by MAC@1\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        data_pdu_size);
#endif
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            }
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            if (!(pdu_mem_p = get_free_mem_block (data_pdu_size + sizeof(struct mac_tb_req)))) {
#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_E(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT5 ERROR COULD NOT GET NEW PDU, EXIT\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id);
#endif
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                return;
            }
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#if defined(TRACE_RLC_UM_SEGMENT)
            LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT5 get new PDU %d bytes\n",
                    frameP,
                    (rlc_pP->is_enb) ? "eNB" : "UE",
                    rlc_pP->enb_module_id,
                    rlc_pP->ue_module_id,
                    rlc_pP->rb_id,
                    data_pdu_size);
#endif
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            pdu_remaining_size = data_pdu_size - 1;
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            pdu_p        = (rlc_um_pdu_sn_5_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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            memset (pdu_mem_p->data, 0, sizeof (rlc_um_pdu_sn_5_t)+sizeof(struct mac_tb_req));
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            li_length_in_bytes = 1;
        }
        //----------------------------------------
        // compute how many SDUS can fill the PDU
        //----------------------------------------
        continue_fill_pdu_with_sdu = 1;
        num_fill_sdu               = 0;
        test_num_li                = 0;
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        sdu_buffer_index           = rlc_pP->current_sdu_index;
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        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;


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        while ((rlc_pP->input_sdus[sdu_buffer_index]) && (continue_fill_pdu_with_sdu > 0)) {
            sdu_mngt_p = ((struct rlc_um_tx_sdu_management *) (rlc_pP->input_sdus[sdu_buffer_index]->data));
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            if (sdu_mngt_p->sdu_remaining_size > test_pdu_remaining_size) {
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                // 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;
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            } else if (sdu_mngt_p->sdu_remaining_size == test_pdu_remaining_size) {
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                // 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;
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            } else if ((sdu_mngt_p->sdu_remaining_size + (test_li_length_in_bytes ^ 3)) == test_pdu_remaining_size ) {
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                // 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);
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		data_pdu_size -=  (test_li_length_in_bytes ^ 3);//modifier pour duy
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            } else if ((sdu_mngt_p->sdu_remaining_size + (test_li_length_in_bytes ^ 3)) < test_pdu_remaining_size ) {
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                test_num_li += 1;
                num_fill_sdu += 1;
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                test_pdu_remaining_size = test_pdu_remaining_size - (sdu_mngt_p->sdu_remaining_size + (test_li_length_in_bytes ^ 3));
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                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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#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT5 sdu_mngt_p->sdu_remaining_size=%d test_pdu_remaining_size=%d test_li_length_in_bytes=%d\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        sdu_mngt_p->sdu_remaining_size,
                        test_pdu_remaining_size,
                        test_li_length_in_bytes ^ 3);
#endif
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                // 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;
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                data_pdu_size -= 1;//modifier pour duy
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            }
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            sdu_buffer_index = (sdu_buffer_index + 1) % rlc_pP->size_input_sdus_buffer;
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        }
        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;
        }
        //----------------------------------------
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        // Do the real filling of the pdu_p
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        //----------------------------------------
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#if defined(TRACE_RLC_UM_SEGMENT)
        LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] data shift %d Bytes num_li %d\n",
                frameP,
                (rlc_pP->is_enb) ? "eNB" : "UE",
                rlc_pP->enb_module_id,
                rlc_pP->ue_module_id,
                rlc_pP->rb_id,
                ((test_num_li*3) +1) >> 1,
                test_num_li);
#endif
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        data = ((char*)(&pdu_p->data[((test_num_li*3) +1) >> 1]));
        e_li_p = (rlc_um_e_li_t*)(pdu_p->data);
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        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 (
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            ((struct rlc_um_tx_sdu_management *) (rlc_pP->input_sdus[rlc_pP->current_sdu_index]->data))->sdu_remaining_size ==
            ((struct rlc_um_tx_sdu_management *) (rlc_pP->input_sdus[rlc_pP->current_sdu_index]->data))->sdu_size) {
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            fi_first_byte_pdu_is_first_byte_sdu = 1;
        }
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        while ((rlc_pP->input_sdus[rlc_pP->current_sdu_index]) && (continue_fill_pdu_with_sdu > 0)) {
            sdu_mngt_p = ((struct rlc_um_tx_sdu_management *) (rlc_pP->input_sdus[rlc_pP->current_sdu_index]->data));
            if (sdu_mngt_p->sdu_segmented_size == 0) {
#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT5 GET NEW SDU %p AVAILABLE SIZE %d Bytes\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        sdu_mngt_p,
                        sdu_mngt_p->sdu_remaining_size);
#endif
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            } else {
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#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT5 GET AGAIN SDU %p REMAINING AVAILABLE SIZE %d Bytes / %d Bytes \n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        sdu_mngt_p,
                        sdu_mngt_p->sdu_remaining_size,
                        sdu_mngt_p->sdu_size);
#endif
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            }
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            data_sdu_p = &((rlc_pP->input_sdus[rlc_pP->current_sdu_index])->data[sizeof (struct rlc_um_tx_sdu_management) + sdu_mngt_p->sdu_segmented_size]);

            if (sdu_mngt_p->sdu_remaining_size > pdu_remaining_size) {
#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT5 Filling all remaining PDU with %d bytes\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        pdu_remaining_size);
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT5 pdu_mem_p %p pdu_p %p pdu_p->data %p data %p data_sdu_p %p pdu_remaining_size %d\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        pdu_mem_p,
                        pdu_p,
                        pdu_p->data,
                        data,
                        data_sdu_p,
                        pdu_remaining_size);
#endif
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                memcpy(data, data_sdu_p, 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;
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                fi_last_byte_pdu_is_last_byte_sdu = 0;
                // no LI
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                rlc_pP->buffer_occupancy -= pdu_remaining_size;
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                continue_fill_pdu_with_sdu = 0;
                pdu_remaining_size = 0;
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            } else if (sdu_mngt_p->sdu_remaining_size == pdu_remaining_size) {
#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT5 Exactly Filling remaining PDU with %d remaining bytes of SDU\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        pdu_remaining_size);
                memcpy(data, data_sdu_p, pdu_remaining_size);
#endif
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                // free SDU
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                rlc_pP->buffer_occupancy -= sdu_mngt_p->sdu_remaining_size;
                free_mem_block (rlc_pP->input_sdus[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_pP->size_input_sdus_buffer;
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                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;
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            } else if ((sdu_mngt_p->sdu_remaining_size + (li_length_in_bytes ^ 3)) < pdu_remaining_size ) {
#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT5 Filling  PDU with %d all remaining bytes of SDU\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        sdu_mngt_p->sdu_remaining_size);
#endif
                memcpy(data, data_sdu_p, sdu_mngt_p->sdu_remaining_size);
                data = &data[sdu_mngt_p->sdu_remaining_size];
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                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) {
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                        //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;
#if defined(TRACE_RLC_UM_SEGMENT)
                    LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT5 set e_li_p->b1=%02X set e_li_p->b2=%02X fill_num_li=%d test_num_li=%d\n",
                            frameP,
                            (rlc_pP->is_enb) ? "eNB" : "UE",
                            rlc_pP->enb_module_id,
                            rlc_pP->ue_module_id,
                            rlc_pP->rb_id,
                            e_li_p->b1,
                            e_li_p->b2,
                            fill_num_li,
                            test_num_li);
#endif
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                } else {
                    if (fill_num_li != test_num_li) {
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                        //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;
#if defined(TRACE_RLC_UM_SEGMENT)
                    LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT5 set e_li_p->b2=%02X set e_li_p->b3=%02X fill_num_li=%d test_num_li=%d\n",
                            frameP,
                            (rlc_pP->is_enb) ? "eNB" : "UE",
                            rlc_pP->enb_module_id,
                            rlc_pP->ue_module_id,
                            rlc_pP->rb_id,
                            e_li_p->b2,
                            e_li_p->b3,
                            fill_num_li,
                            test_num_li);
#endif
                    e_li_p++;
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                }

                // free SDU
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                rlc_pP->buffer_occupancy -= sdu_mngt_p->sdu_remaining_size;
                free_mem_block (rlc_pP->input_sdus[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_pP->size_input_sdus_buffer;
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                pdu_remaining_size = pdu_remaining_size - (sdu_mngt_p->sdu_remaining_size + li_length_in_bytes);
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            } else {
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#if defined(TRACE_RLC_UM_SEGMENT)
                LOG_D(RLC, "[FRAME %05u][%s][RLC_UM][MOD %u/%u][RB %u] SEGMENT5 Filling  PDU with %d all remaining bytes of SDU and reduce TB size by %d bytes\n",
                        frameP,
                        (rlc_pP->is_enb) ? "eNB" : "UE",
                        rlc_pP->enb_module_id,
                        rlc_pP->ue_module_id,
                        rlc_pP->rb_id,
                        sdu_mngt_p->sdu_remaining_size,
                        pdu_remaining_size - sdu_mngt_p->sdu_remaining_size);
#endif
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#ifdef USER_MODE
                assert(1!=1);
#endif
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                memcpy(data, data_sdu_p, sdu_mngt_p->sdu_remaining_size);
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                // free SDU
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                rlc_pP->buffer_occupancy -= sdu_mngt_p->sdu_remaining_size;
                free_mem_block (rlc_pP->input_sdus[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_pP->size_input_sdus_buffer;
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                // 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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                pdu_remaining_size = pdu_remaining_size - sdu_mngt_p->sdu_remaining_size;
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            }
        }

        // set framing info
        if (fi_first_byte_pdu_is_first_byte_sdu) {
            fi = 0;
        } else {
            fi = 2;
        }
        if (!fi_last_byte_pdu_is_last_byte_sdu) {
            fi = fi + 1;
        }
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        pdu_p->b1 =  (fi << 6); //pdu_p->b1 |
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        // set fist e bit
        if (fill_num_li > 0) {
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            pdu_p->b1 = pdu_p->b1 | 0x20;
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        }
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        pdu_p->b1 = pdu_p->b1 | (rlc_pP->vt_us & 0x1F);
        rlc_pP->vt_us = rlc_pP->vt_us+1;
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        pdu_tb_req_p->data_ptr        = (unsigned char*)pdu_p;
        pdu_tb_req_p->tb_size         = data_pdu_size - pdu_remaining_size;
        list_add_tail_eurecom (pdu_mem_p, &rlc_pP->pdus_to_mac_layer);
        rlc_util_print_hex_octets(RLC, (unsigned char*)pdu_mem_p->data, data_pdu_size);
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        AssertFatal( pdu_tb_req_p->tb_size > 0 , "SEGMENT5: FINAL RLC UM PDU LENGTH %d", pdu_tb_req_p->tb_size);
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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
    }
}