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path: root/cesar/mac/pbproc/src/fsm_tx_data.c
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/* Maria project {{{
 *
 * Copyright (C) 2007 Spidcom
 *
 * <<<Licence>>>
 *
 * }}} */
/**
 * \file    mac/pbproc/src/fsm_tx_data.c
 * \brief   FSM TX data part.
 * \ingroup mac_pbproc
 */
#include "common/std.h"

#include "inc/context.h"
#include "inc/fc.h"

#include "inc/fsm_top.h"
#include "inc/fsm_handle_fc.h"
#include "inc/prep_mpdu.h"
#include "inc/pbproc.h"

#include "inc/fsm_tx_data.h"

void
pbproc_ftda_init (pbproc_t *ctx)
{
    dbg_assert (ctx);
    ctx->fsm.states[PBPROC_FSM_STATE_TX_WAIT_ACCESS_CONF].rx_fc_cb =
        CALLBACK (pbproc_ftda__tx_wait_access_conf__rx_fc);
    ctx->fsm.states[PBPROC_FSM_STATE_TX_WAIT_ACCESS_CONF].access_cb =
        CALLBACK (pbproc_ftda__tx_wait_access_conf__access);
    ctx->fsm.states[PBPROC_FSM_STATE_TX_WAIT_ACCESS_CONF].access_conf_cb =
        CALLBACK (pbproc_ftda__tx_wait_access_conf__access_conf);
    ctx->fsm.states[PBPROC_FSM_STATE_TX_WAIT_SACKD].rx_fc_cb =
        CALLBACK (pbproc_ftda__tx_wait_sackd__rx_fc);
    ctx->fsm.states[PBPROC_FSM_STATE_TX_WAIT_SACKD].access_cb =
        CALLBACK (pbproc_ftda__tx_wait_sackd__access);
    ctx->fsm.states[PBPROC_FSM_STATE_TX_WAIT_TX_END].pbdma_cb =
        CALLBACK (pbproc_ftda__tx_wait_tx_end__pbdma);
    ctx->fsm.states[PBPROC_FSM_STATE_TX_BURST].access_conf_cb =
        CALLBACK (pbproc_ftda__tx_burst__access_conf);
}

void ARCH_ILRAM
pbproc_ftda__handle (pbproc_t *ctx)
{
    pbproc_prep_mpdu_single_t *mpdu = ctx->prep_mpdu.current;
    dbg_claim (ctx);
    if (PHY_FC_MODE_IS_HYBRID (ctx->prep_mpdu.fc_mode))
        phy_tx_fc10 (ctx->phy, ctx->prep_mpdu.tx_date, ctx->prep_mpdu.fc10);
#if CONFIG_MAC_PBPROC_EOC_FC
    if (mpdu->pb_nb_total)
#endif
    {
        phy_pbdma_start (ctx->phy, ctx->prep_mpdu.bypass_aes,
                         ctx->prep_mpdu.nek, mpdu->pb_nb_total,
                         ctx->prep_mpdu.wack ? 0 : mpdu->pb_nb_total,
                         &mpdu->main_head->phy_pb, NULL, false);
        if (mpdu->tmi >= PHY_MOD_ROBO_NB)
            phy_set_tonemap (ctx->phy, ctx->prep_mpdu.tonemap);
        phy_tx_param (ctx->phy, ctx->prep_mpdu.fc_mode,
                      ctx->prep_mpdu.phy_combo_params, ctx->prep_mpdu.gil,
                      ctx->prep_mpdu.symb_nb);
    }
#if CONFIG_MAC_PBPROC_EOC_FC
    else
    {
        phy_tx_param_short (ctx->phy, ctx->prep_mpdu.fc_mode);
        ctx->stats.tx_data_empty++;
    }
#endif
    bool prp = ctx->access.prp && !ctx->prep_mpdu.rts_cts;
    phy_tx_frame (ctx->phy, ctx->prep_mpdu.tx_date, true, prp,
                  ctx->prep_mpdu.fc_av.words);
    /* Always program a timer because TX can be canceled due to false alarms,
     * see maria:#706. */
    ca_access_vcs_restart_eifs (ctx->ca, ctx->prep_mpdu.tx_date);
    pbproc_fsm_change_state (ctx, PBPROC_FSM_STATE_TX_WAIT_ACCESS_CONF);
    ctx->stats.tx_data++;
    if (ctx->prep_mpdu.main_mfs_cmd == MFS_FSM_CMD_RE_SYNC)
        ctx->stats.tx_data_re_sync++;
}

void ARCH_ILRAM
pbproc_ftda__tx_wait_access_conf__rx_fc (pbproc_t *ctx, u32 rx_date,
                                         const pbproc_fc_t *fc_av)
{
    dbg_claim (ctx);
    /* Update backoff. */
    pbproc_backoff_lost (ctx);
    /* Handle FC. */
    pbproc_fhfc_handle_fc (ctx, rx_date, fc_av);
    /* Now, we have time, cancel transmission. */
    pbproc_prep_mpdu_cancel_burst (ctx);
    ctx->stats.tx_data_cancel++;
}

#if CONFIG_MAC_PBPROC_EOC_ILRAM
void
#else
void ARCH_ILRAM
#endif
pbproc_ftda__tx_wait_access_conf__access (pbproc_t *ctx)
{
    dbg_claim (ctx);
    pbproc_prep_mpdu_cancel_burst (ctx);
    if (CONFIG_MAC_PBPROC_EOC_FC)
    {
        /* Prepare next schedule, start access timer. */
        ca_access_vcs_restart (ctx->ca, phy_date ()
                               + ctx->times.pre_fcs_tck + MAC_CIFS_TCK);
        pbproc_fsm_change_state (ctx, PBPROC_FSM_STATE_IDLE);
    }
    else
        pbproc_ftop__idle__access (ctx);
    ctx->stats.prp_lost++;
    ctx->stats.tx_data_cancel++;
}

void ARCH_ILRAM
pbproc_ftda__tx_wait_access_conf__access_conf (pbproc_t *ctx)
{
    dbg_claim (ctx);
    uint pb_nb_total = ctx->prep_mpdu.current->pb_nb_total;
    /* Check PB total. */
    if (pb_nb_total || !CONFIG_MAC_PBPROC_EOC_FC)
    {
        /* Start DMA. */
        phy_tx_prepare (ctx->phy);
        /* Chain remaining PB. */
        pbproc_prep_mpdu_chain (ctx);
    }
    if (ctx->prep_mpdu.mpdu_count != 0)
    {
        phy_access_timer_cancel (ctx->phy);
        ca_access_hold (ctx->ca);
        /* Burst, prepare next frame. */
        u32 next_date = ctx->prep_mpdu.tx_date + ctx->prep_mpdu.flp_tck;
        ctx->access.duration_tck -= next_date - ctx->access.access_date;
        ctx->access.access_date = next_date;
        pbproc_prep_mpdu (ctx, ctx->prep_mpdu.main_mfs);
        dbg_claim (ctx->prep_mpdu.valid);
        /* Sent it to hardware. DMA are not started or it would damage the
         * current MPDU. */
        PBPROC_TRACE (FTDA_TX_BURST, ctx->prep_mpdu.tx_date,
                      ctx->prep_mpdu.flp_tck,
                      ctx->prep_mpdu.current->pb_nb_total);
        if (PHY_FC_MODE_IS_HYBRID (ctx->prep_mpdu.fc_mode))
            phy_tx_fc10 (ctx->phy, ctx->prep_mpdu.tx_date,
                         ctx->prep_mpdu.fc10);
        if (ctx->prep_mpdu.current->pb_nb_total)
            phy_tx_param (ctx->phy, ctx->prep_mpdu.fc_mode,
                          ctx->prep_mpdu.phy_combo_params,
                          ctx->prep_mpdu.gil, ctx->prep_mpdu.symb_nb);
        else
            phy_tx_param_short (ctx->phy, ctx->prep_mpdu.fc_mode);
        phy_tx_frame (ctx->phy, ctx->prep_mpdu.tx_date, true, false,
                      ctx->prep_mpdu.fc_av.words);
        /* Wait for ACCESS CONF to continue. */
        pbproc_fsm_change_state (ctx, PBPROC_FSM_STATE_TX_BURST);
        ctx->stats.tx_data_burst++;
    }
    else
    {
        ctx->prep_mpdu.main_mfs->stats.num_bursts++;
        if (ctx->prep_mpdu.wack)
        {
            /* With ACK. */
            ca_backoff_deferred (ctx->ca,
                                 phy_access_backoff_slot_count (ctx->phy)
                                 - 2);
            ca_access_vcs_restart_eifs (ctx->ca, ctx->prep_mpdu.tx_date
                                        + ctx->prep_mpdu.flp_tck);
            phy_rx_activate (ctx->phy, false, ctx->prep_mpdu.tx_date
                             + ctx->prep_mpdu.flp_tck, true);
            pbproc_fsm_change_state (ctx, PBPROC_FSM_STATE_TX_WAIT_SACKD);
            ctx->stats.tx_data_wack++;
        }
        else
        {
            /* Without ACK. */
            ca_access_hold (ctx->ca);
            pbproc_fsm_change_state (ctx, PBPROC_FSM_STATE_TX_WAIT_TX_END);
            if (ctx->prep_mpdu.main_mfs->beacon)
                ctx->stats.tx_data_beacon++;
            else
                ctx->stats.tx_data_woack++;
            if (CONFIG_MAC_PBPROC_EOC_FC && pb_nb_total == 0)
                /* If Short SOF is sent goto tx end, but tx_end is here. */
                pbproc_ftda__tx_wait_tx_end__pbdma(ctx);
        }
    }

    /* in EoC it is possible to prematurely ack prep_mpdu, short msgs */
    if (!CONFIG_MAC_PBPROC_EOC_FC || ctx->prep_mpdu.valid)
    {
        /* Update link stats. */
        ctx->prep_mpdu.main_mfs->stats.num_mpdus++;
        ctx->prep_mpdu.main_mfs->stats.num_pbs += pb_nb_total;
        /* If there is a pending SPOC update and enough time, program it. */
        if (ctx->prep_mpdu.ifs_tck >= PHY_PREPARE_DELAY_TCK)
            pbproc_spoc_schedule_update (ctx, ctx->prep_mpdu.tx_date
                                         + ctx->prep_mpdu.flp_tck
                                         - ctx->prep_mpdu.ifs_tck);
    }
}

static bool ARCH_ILRAM
pbproc_ftda_parse_sack (pbproc_t *ctx, const pbproc_fc_t *fc_av,
                        pbproc_fc_ack_data_t *ack_data)
{
    dbg_claim (ack_data);
    pbproc_prep_mpdu_t *prep = &ctx->prep_mpdu;
    bool fc_ok;
    u32 sack_w0 = fc_av->words[0];
    if (fc_av
        && ((sack_w0
             & BF_MASKS (PBPROC_FC_SACK_W0, DT_AV, ACCESS, SNID, DTEI))
            == (u32) BF_FILL (PBPROC_FC_SACK_W0, (DT_AV, PBPROC_FC_DT_SACK),
                              (ACCESS, false), (SNID, ctx->alloc.snid),
                              (DTEI, prep->stei)))
       )
    {
        /** FC is for us, parse the data. */
        ack_data->sackt[0] = BF_GET (PBPROC_FC_SACK_W0__SACKT0, sack_w0);
        ack_data->sackt[1] = BF_GET (PBPROC_FC_SACK_W0__SACKT1, sack_w0);
        ack_data->sackt[2] = BF_GET (PBPROC_FC_SACK_W0__SACKT2, sack_w0);
        ack_data->sackt[3] = BF_GET (PBPROC_FC_SACK_W0__SACKT3, sack_w0);
        uint sacki_length = PBPROC_FC_SACK_SACKI_BITS;
        u32 sacki_last = fc_av->sack.sacki_last;
        u32 sacki_msb = sacki_last;
        if (sack_w0 & BF_MASK (PBPROC_FC_SACK_W0__RRTF))
        {
            static const uint rrtl_map_tck[PBPROC_FC_SACK_RRTL_NB] = {
                4096, 5120, 6144, 7168, 8192, 10240, 12288, 14336, 16384,
                20480, 24576, 28672, 32768, 40960, 49152, 57344 };
            ack_data->rrtl_tck = rrtl_map_tck[sacki_msb >> 4];
            sacki_msb <<= 4;
            sacki_length -= 4;
        }
        else
            ack_data->rrtl_tck = 0;
        if (MAC_LID_IS_PLID (prep->main_mfs->common.lid))
        {
            ack_data->rxwsz = sacki_msb >> 4;
            sacki_length -= 4;
        }
        pbproc_sacki_dec_init (&ack_data->sacki_dec, fc_av->sack.sacki[0],
                               fc_av->sack.sacki[1], sacki_last,
                               sacki_length);
        if (prep->main_mfs->common.mme)
            ack_data->mfs_rsp = BF_GET (PBPROC_FC_SACK_W0__MFS_RSP_MGMT,
                                        sack_w0);
        else
            ack_data->mfs_rsp = BF_GET (PBPROC_FC_SACK_W0__MFS_RSP_DATA,
                                        sack_w0);
        fc_ok = true;
    }
    else
    {
        /** FC is not for us, it will be ignored. */
        fc_ok = false;
    }
    return fc_ok;
}

#if CONFIG_MAC_PBPROC_EOC_FC

PRIVATE bool ARCH_ILRAM
pbproc_ftda_parse_sackd (pbproc_t *ctx, const pbproc_fc_t *fc_av,
                         pbproc_fc_ack_data_t *ack_data)
{
    dbg_claim (ack_data);
    bool valid_ack = false;
    /* Place for EOC SACKD encapsulated in next frame.
     * Direction should be as expected; for CCO frame should be from
     * expected station. STA shouldn't consider RSOF at all. */
    if (fc_av
        && fc_av->generic.access == false
        && fc_av->generic.snid == ctx->alloc.snid
        && ctx->prep_mpdu.valid)
    {
        uint direction = MAC_TEI_IS_EOC_CCO (ctx->config->tei);
        uint tei = ctx->prep_mpdu.dtei;
        uint type = fc_av->generic.dt_av;
        if (type == PBPROC_FC_DT_SOUND)
            valid_ack = (direction == fc_av->sound.direction)
                && (!direction || fc_av->sound.dtei == tei);
        else if (type == PBPROC_FC_DT_SOF)
            valid_ack = (direction == fc_av->sof.direction)
                && (!direction || fc_av->sof.dtei == tei);
        else if (type == PBPROC_FC_DT_RSOF)
            valid_ack = direction && (fc_av->rsof.dtei == tei);
    }
    if (valid_ack)
    {
        uint sackt0 = PBPROC_FC_SACKT_NOT_RECEIVED, si[3] = {0, 0, 0}, sil = 0;
        /* Compute bitmap and size */
        switch(fc_av->generic.dt_av)
        {
        case PBPROC_FC_DT_SOF:
            sackt0 = fc_av->sof.sackt0;
            si[0] = fc_av->sof.sacki0;
            si[1] = fc_av->sof.sacki1;
            sil = PBPROC_FC_SACKI_EOC_SOF_SIZE;
            break;
        case PBPROC_FC_DT_RSOF:
            sackt0 = fc_av->rsof.sackt0;
            si[0] = fc_av->rsof.sacki0;
            si[1] = fc_av->rsof.sacki1;
            sil = PBPROC_FC_SACKI_EOC_RSOF_SIZE;
            break;
        case PBPROC_FC_DT_SOUND:
            sackt0 = fc_av->sound.sackt0;
            si[0] = fc_av->sound.sacki0
                | (fc_av->sound.sacki1 << PBPROC_FC_SACKI_EOC_SOUND_LEFT);
            si[1] = fc_av->sound.sacki1 >> (32 - PBPROC_FC_SACKI_EOC_SOUND_LEFT);
            sil = PBPROC_FC_SACKI_EOC_SOUND_SIZE;
            break;
        default:
            dbg_assert_default ();
        }
        pbproc_sacki_dec_init (&ack_data->sacki_dec, si[0], si[1], si[2], sil);
        ack_data->sackt[0] = sackt0;
        ack_data->sackt[1] = PBPROC_FC_SACKT_NOT_RECEIVED;
        ack_data->sackt[2] = PBPROC_FC_SACKT_NOT_RECEIVED;
        ack_data->sackt[3] = PBPROC_FC_SACKT_NOT_RECEIVED;
        ack_data->rrtl_tck = 0;
        ack_data->mfs_rsp = MFS_FSM_RSP_NB;
        ack_data->rxwsz = MFS_WINDOW_SIZE_NB;
    }
    return valid_ack;
}

#endif

void ARCH_ILRAM
pbproc_ftda__tx_wait_sackd__rx_fc (pbproc_t *ctx, u32 rx_date,
                                   const pbproc_fc_t *fc_av)
{
    dbg_claim (ctx);
    pbproc_fc_ack_data_t ack_data;
    /* Is it our SACK. */
    if (less_mod2p32 (rx_date, ctx->prep_mpdu.tx_date
                      + ctx->prep_mpdu.flp_tck + MAC_TOLERANCE_TCK)
        && pbproc_ftda_parse_sack (ctx, fc_av, &ack_data))
    {
        phy_rx_prepare_short (ctx->phy);
        /* Update MFS parameters and handle SACKD. */
        pbproc_prep_mpdu_handle_sack (ctx, &ack_data);
        /* Next. */
        if (!ctx->access.cfp)
        {
            ca_backoff_success (ctx->ca);
            ca_access_vcs_restart (ctx->ca, rx_date + ctx->times.pre_fcs_tck
                                   + MAC_CIFS_TCK);
            pbproc_fsm_change_state (ctx, PBPROC_FSM_STATE_IDLE);
        }
        else
        {
            if (CONFIG_MAC_PBPROC_EOC_FC)
            {
                ca_access_vcs_restart (ctx->ca, rx_date
                                       + ctx->times.pre_fcs_tck
                                       + MAC_CIFS_TCK);
                pbproc_fsm_change_state (ctx, PBPROC_FSM_STATE_IDLE);
            }
            else
            {
                //handle_access ();
            }
        }
        ctx->stats.tx_data_wack_ack++;
    }
    else
    {
#if CONFIG_MAC_PBPROC_EOC_FC
        /* Not our SACK, may contain our SACKD. */
        if (less_mod2p32 (rx_date, ctx->prep_mpdu.tx_date /* TODO chk timeval*/
                          + ctx->prep_mpdu.flp_tck
                          + MAC_FL_TO_TCK (MAC_MAX_FL_MAX_FL))
            && pbproc_ftda_parse_sackd (ctx, fc_av, &ack_data))
        {
            if (!ctx->access.cfp)
                ca_backoff_success (ctx->ca);
            pbproc_fhfc_handle_fc (ctx, rx_date, fc_av);
            pbproc_prep_mpdu_ack (ctx, ack_data.sackt, &ack_data.sacki_dec);
            ctx->stats.tx_data_wack_ack++;
        }
        else
#endif
        {
            pbproc_fhfc_handle_fc (ctx, rx_date, fc_av);
            pbproc_prep_mpdu_cancel_burst (ctx);
            ctx->stats.tx_data_wack_noack++;
        }
    }
}

#if CONFIG_MAC_PBPROC_EOC_ILRAM
void
#else
void ARCH_ILRAM
#endif
pbproc_ftda__tx_wait_sackd__access (pbproc_t *ctx)
{
    dbg_claim (ctx);
#if CONFIG_MAC_COMMON_EOC_MFS
    pbproc_prep_mpdu_access_track (ctx);
#endif
    pbproc_prep_mpdu_cancel_burst (ctx);
    if (CONFIG_MAC_PBPROC_EOC_FC)
    {
        /* Prepare next schedule, start access timer. */
        ca_access_vcs_restart (ctx->ca, phy_date ()
                               + ctx->times.pre_fcs_tck + MAC_CIFS_TCK);
        pbproc_fsm_change_state (ctx, PBPROC_FSM_STATE_IDLE);
    }
    else
        pbproc_ftop__idle__access (ctx);
    ctx->stats.tx_data_wack_noack++;
}

void ARCH_ILRAM
pbproc_ftda__tx_wait_tx_end__pbdma (pbproc_t *ctx)
{
    dbg_claim (ctx);
    uint sack_tck = !ctx->prep_mpdu.main_mfs->beacon
        ? ctx->times.pre_fcs_tck + MAC_CIFS_TCK : 0;
    pbproc_prep_mpdu_ack_all_burst (ctx);
    ca_backoff_success (ctx->ca);
    ca_access_vcs_restart (ctx->ca, ctx->prep_mpdu.tx_date
                           + ctx->prep_mpdu.flp_tck + sack_tck);
    pbproc_fsm_change_state (ctx, PBPROC_FSM_STATE_IDLE);
}

#if CONFIG_MAC_PBPROC_EOC_ILRAM
void
#else
void ARCH_ILRAM
#endif
pbproc_ftda__tx_burst__access_conf (pbproc_t *ctx)
{
    dbg_claim (ctx);
    phy_access_timer_cancel (ctx->phy);
    pbproc_prep_mpdu_single_t *mpdu = ctx->prep_mpdu.current;
    /* Check for burst interruption. */
    if (mpdu->pb_nb_total)
    {
        phy_pbdma_start (ctx->phy, ctx->prep_mpdu.bypass_aes,
                         ctx->prep_mpdu.nek, mpdu->pb_nb_total,
                         ctx->prep_mpdu.wack ? 0 : mpdu->pb_nb_total,
                         &mpdu->main_head->phy_pb, NULL, false);
        if (mpdu->tmi >= PHY_MOD_ROBO_NB)
            phy_set_tonemap (ctx->phy, ctx->prep_mpdu.tonemap);
        pbproc_ftda__tx_wait_access_conf__access_conf (ctx);
    }
    else
    {
        /* Always with ACK. */
        ca_backoff_deferred (ctx->ca,
                             phy_access_backoff_slot_count (ctx->phy) - 2);
        ca_access_vcs_restart_eifs (ctx->ca, ctx->prep_mpdu.tx_date
                                    + ctx->prep_mpdu.flp_tck);
        phy_rx_activate (ctx->phy, false, ctx->prep_mpdu.tx_date
                         + ctx->prep_mpdu.flp_tck, true);
        pbproc_fsm_change_state (ctx, PBPROC_FSM_STATE_TX_WAIT_SACKD);
        ctx->stats.tx_data_wack++;
        ctx->stats.tx_data_burst_interrupted++;
        /* Update link stats. */
        ctx->prep_mpdu.main_mfs->stats.num_bursts++;
        ctx->prep_mpdu.main_mfs->stats.num_mpdus++;
    }
}