358 lines
8.5 KiB
C
358 lines
8.5 KiB
C
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#include <string.h>
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#include <errno.h>
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#include <sysmocom/femtobts/superfemto.h>
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#include <sysmocom/femtobts/gsml1prim.h>
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#include <sysmocom/femtobts/gsml1const.h>
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#include <sysmocom/femtobts/gsml1types.h>
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#include <osmocom/core/gsmtap.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/timer.h>
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#include <sysmo_l1_if.h>
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#include <gprs_debug.h>
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#include <pcu_l1_if.h>
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extern void *tall_pcu_ctx;
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uint32_t l1if_ts_to_hLayer2(uint8_t trx, uint8_t ts)
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{
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return (ts << 16) | (trx << 24);
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}
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/* allocate a msgb containing a GsmL1_Prim_t */
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struct msgb *l1p_msgb_alloc(void)
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{
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struct msgb *msg = msgb_alloc(sizeof(GsmL1_Prim_t), "l1_prim");
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if (msg)
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msg->l1h = msgb_put(msg, sizeof(GsmL1_Prim_t));
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return msg;
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}
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static int l1if_req_pdch(struct femtol1_hdl *fl1h, struct msgb *msg)
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{
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struct osmo_wqueue *wqueue = &fl1h->write_q[MQ_PDTCH_WRITE];
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osmo_wqueue_enqueue(wqueue, msg);
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return 0;
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}
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static void *prim_init(GsmL1_Prim_t *prim, GsmL1_PrimId_t id, struct femtol1_hdl *gl1)
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{
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prim->id = id;
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/* for some reason the hLayer1 field is not always at the same position
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* in the GsmL1_Prim_t, so we have to have this ugly case statement here... */
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switch (id) {
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case GsmL1_PrimId_MphInitReq:
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//prim->u.mphInitReq.hLayer1 = gl1->hLayer1;
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break;
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case GsmL1_PrimId_MphCloseReq:
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prim->u.mphCloseReq.hLayer1 = gl1->hLayer1;
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break;
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case GsmL1_PrimId_MphConnectReq:
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prim->u.mphConnectReq.hLayer1 = gl1->hLayer1;
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break;
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case GsmL1_PrimId_MphDisconnectReq:
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prim->u.mphDisconnectReq.hLayer1 = gl1->hLayer1;
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break;
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case GsmL1_PrimId_MphActivateReq:
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prim->u.mphActivateReq.hLayer1 = gl1->hLayer1;
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break;
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case GsmL1_PrimId_MphDeactivateReq:
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prim->u.mphDeactivateReq.hLayer1 = gl1->hLayer1;
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break;
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case GsmL1_PrimId_MphConfigReq:
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prim->u.mphConfigReq.hLayer1 = gl1->hLayer1;
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break;
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case GsmL1_PrimId_MphMeasureReq:
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prim->u.mphMeasureReq.hLayer1 = gl1->hLayer1;
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break;
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case GsmL1_PrimId_MphInitCnf:
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case GsmL1_PrimId_MphCloseCnf:
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case GsmL1_PrimId_MphConnectCnf:
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case GsmL1_PrimId_MphDisconnectCnf:
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case GsmL1_PrimId_MphActivateCnf:
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case GsmL1_PrimId_MphDeactivateCnf:
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case GsmL1_PrimId_MphConfigCnf:
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case GsmL1_PrimId_MphMeasureCnf:
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break;
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case GsmL1_PrimId_MphTimeInd:
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break;
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case GsmL1_PrimId_MphSyncInd:
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break;
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case GsmL1_PrimId_PhEmptyFrameReq:
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prim->u.phEmptyFrameReq.hLayer1 = gl1->hLayer1;
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break;
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case GsmL1_PrimId_PhDataReq:
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prim->u.phDataReq.hLayer1 = gl1->hLayer1;
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break;
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case GsmL1_PrimId_PhConnectInd:
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break;
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case GsmL1_PrimId_PhReadyToSendInd:
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break;
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case GsmL1_PrimId_PhDataInd:
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break;
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case GsmL1_PrimId_PhRaInd:
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break;
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default:
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LOGP(DL1IF, LOGL_ERROR, "unknown L1 primitive %u\n", id);
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break;
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}
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return &prim->u;
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}
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struct sapi_dir {
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GsmL1_Sapi_t sapi;
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GsmL1_Dir_t dir;
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};
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static const struct sapi_dir pdtch_sapis[] = {
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{ GsmL1_Sapi_Pdtch, GsmL1_Dir_TxDownlink },
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{ GsmL1_Sapi_Pdtch, GsmL1_Dir_RxUplink },
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{ GsmL1_Sapi_Ptcch, GsmL1_Dir_TxDownlink },
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{ GsmL1_Sapi_Prach, GsmL1_Dir_RxUplink },
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#if 0
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{ GsmL1_Sapi_Ptcch, GsmL1_Dir_RxUplink },
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{ GsmL1_Sapi_Pacch, GsmL1_Dir_TxDownlink },
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#endif
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};
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/* connect PDTCH */
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int l1if_connect_pdch(void *obj, uint8_t ts)
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{
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struct femtol1_hdl *fl1h = obj;
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struct msgb *msg = l1p_msgb_alloc();
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GsmL1_MphConnectReq_t *cr;
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cr = prim_init(msgb_l1prim(msg), GsmL1_PrimId_MphConnectReq, fl1h);
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cr->u8Tn = ts;
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cr->logChComb = GsmL1_LogChComb_XIII;
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return l1if_req_pdch(fl1h, msg);
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}
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static int handle_ph_readytosend_ind(struct femtol1_hdl *fl1h,
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GsmL1_PhReadyToSendInd_t *rts_ind)
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{
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struct gsm_time g_time;
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int rc = 0;
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gsm_fn2gsmtime(&g_time, rts_ind->u32Fn);
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DEBUGP(DL1IF, "Rx PH-RTS.ind %02u/%02u/%02u SAPI=%s\n",
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g_time.t1, g_time.t2, g_time.t3,
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get_value_string(femtobts_l1sapi_names, rts_ind->sapi));
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switch (rts_ind->sapi) {
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case GsmL1_Sapi_Pdtch:
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case GsmL1_Sapi_Pacch:
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rc = pcu_rx_rts_req_pdtch((long)fl1h->priv, rts_ind->u8Tn,
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rts_ind->u16Arfcn, rts_ind->u32Fn, rts_ind->u8BlockNbr);
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case GsmL1_Sapi_Ptcch:
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// FIXME
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default:
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break;
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}
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return rc;
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}
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static int handle_ph_data_ind(struct femtol1_hdl *fl1h,
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GsmL1_PhDataInd_t *data_ind, struct msgb *l1p_msg)
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{
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int rc = 0;
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gsmtap_send(fl1h->gsmtap, data_ind->u16Arfcn | GSMTAP_ARFCN_F_UPLINK,
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data_ind->u8Tn, GSMTAP_CHANNEL_PACCH, 0,
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data_ind->u32Fn, 0, 0, data_ind->msgUnitParam.u8Buffer,
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data_ind->msgUnitParam.u8Size);
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DEBUGP(DL1IF, "Rx PH-DATA.ind %s (hL2 %08x): %s",
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get_value_string(femtobts_l1sapi_names, data_ind->sapi),
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data_ind->hLayer2,
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osmo_hexdump(data_ind->msgUnitParam.u8Buffer,
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data_ind->msgUnitParam.u8Size));
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switch (data_ind->sapi) {
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case GsmL1_Sapi_Pdtch:
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case GsmL1_Sapi_Pacch:
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/* drop incomplete UL block */
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if (data_ind->msgUnitParam.u8Buffer[0]
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!= GsmL1_PdtchPlType_Full)
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break;
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/* PDTCH / PACCH frame handling */
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pcu_rx_data_ind_pdtch((long)fl1h->priv, data_ind->u8Tn,
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data_ind->msgUnitParam.u8Buffer + 1,
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data_ind->msgUnitParam.u8Size - 1,
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data_ind->u32Fn,
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(int8_t) (data_ind->measParam.fRssi));
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break;
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case GsmL1_Sapi_Ptcch:
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// FIXME
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break;
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default:
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LOGP(DL1IF, LOGL_NOTICE, "Rx PH-DATA.ind for unknown L1 SAPI %s\n",
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get_value_string(femtobts_l1sapi_names, data_ind->sapi));
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break;
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}
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return rc;
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}
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#define MIN_QUAL_RACH 5.0f
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static int handle_ph_ra_ind(struct femtol1_hdl *fl1h, GsmL1_PhRaInd_t *ra_ind)
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{
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uint8_t acc_delay;
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if (ra_ind->measParam.fLinkQuality < MIN_QUAL_RACH)
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return 0;
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DEBUGP(DL1IF, "Rx PH-RA.ind");
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/* check for under/overflow / sign */
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if (ra_ind->measParam.i16BurstTiming < 0)
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acc_delay = 0;
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else
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acc_delay = ra_ind->measParam.i16BurstTiming >> 2;
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#if 0
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if (acc_delay > bts->max_ta) {
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LOGP(DL1C, LOGL_INFO, "ignoring RACH request %u > max_ta(%u)\n",
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acc_delay, btsb->max_ta);
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return 0;
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}
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#endif
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return 0;
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}
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/* handle any random indication from the L1 */
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int l1if_handle_l1prim(int wq, struct femtol1_hdl *fl1h, struct msgb *msg)
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{
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GsmL1_Prim_t *l1p = msgb_l1prim(msg);
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int rc = 0;
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LOGP(DL1IF, LOGL_DEBUG, "Rx L1 prim %s on queue %d\n",
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get_value_string(femtobts_l1prim_names, l1p->id), wq);
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switch (l1p->id) {
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#if 0
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case GsmL1_PrimId_MphTimeInd:
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rc = handle_mph_time_ind(fl1h, &l1p->u.mphTimeInd);
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break;
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case GsmL1_PrimId_MphSyncInd:
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break;
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case GsmL1_PrimId_PhConnectInd:
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break;
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#endif
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case GsmL1_PrimId_PhReadyToSendInd:
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rc = handle_ph_readytosend_ind(fl1h, &l1p->u.phReadyToSendInd);
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break;
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case GsmL1_PrimId_PhDataInd:
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rc = handle_ph_data_ind(fl1h, &l1p->u.phDataInd, msg);
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break;
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case GsmL1_PrimId_PhRaInd:
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rc = handle_ph_ra_ind(fl1h, &l1p->u.phRaInd);
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break;
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default:
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break;
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}
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msgb_free(msg);
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return rc;
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}
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int l1if_handle_sysprim(struct femtol1_hdl *fl1h, struct msgb *msg)
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{
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return -ENOTSUP;
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}
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/* send packet data request to L1 */
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int l1if_pdch_req(void *obj, uint8_t ts, int is_ptcch, uint32_t fn,
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uint16_t arfcn, uint8_t block_nr, uint8_t *data, uint8_t len)
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{
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struct femtol1_hdl *fl1h = obj;
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struct msgb *msg;
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GsmL1_Prim_t *l1p;
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GsmL1_PhDataReq_t *data_req;
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GsmL1_MsgUnitParam_t *msu_param;
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struct gsm_time g_time;
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gsm_fn2gsmtime(&g_time, fn);
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DEBUGP(DL1IF, "TX packet data %02u/%02u/%02u is_ptcch=%d ts=%d "
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"block_nr=%d, arfcn=%d, len=%d\n", g_time.t1, g_time.t2,
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g_time.t3, is_ptcch, ts, block_nr, arfcn, len);
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msg = l1p_msgb_alloc();
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l1p = msgb_l1prim(msg);
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l1p->id = GsmL1_PrimId_PhDataReq;
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data_req = &l1p->u.phDataReq;
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data_req->hLayer1 = fl1h->hLayer1;
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data_req->sapi = (is_ptcch) ? GsmL1_Sapi_Ptcch : GsmL1_Sapi_Pdtch;
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data_req->subCh = GsmL1_SubCh_NA;
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data_req->u8BlockNbr = block_nr;
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data_req->u8Tn = ts;
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data_req->u32Fn = fn;
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msu_param = &data_req->msgUnitParam;
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msu_param->u8Size = len;
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memcpy(msu_param->u8Buffer, data, len);
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gsmtap_send(fl1h->gsmtap, arfcn, data_req->u8Tn, GSMTAP_CHANNEL_PACCH,
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0, data_req->u32Fn, 0, 0,
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data_req->msgUnitParam.u8Buffer,
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data_req->msgUnitParam.u8Size);
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/* transmit */
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osmo_wqueue_enqueue(&fl1h->write_q[MQ_PDTCH_WRITE], msg);
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return 0;
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}
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void *l1if_open_pdch(void *priv, uint32_t hlayer1)
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{
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struct femtol1_hdl *fl1h;
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int rc;
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fl1h = talloc_zero(tall_pcu_ctx, struct femtol1_hdl);
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if (!fl1h)
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return NULL;
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fl1h->hLayer1 = hlayer1;
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fl1h->priv = priv;
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fl1h->clk_cal = 0;
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/* default clock source: OCXO */
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fl1h->clk_src = SuperFemto_ClkSrcId_Ocxo;
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rc = l1if_transport_open(MQ_PDTCH_WRITE, fl1h);
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if (rc < 0) {
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talloc_free(fl1h);
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return NULL;
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}
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fl1h->gsmtap = gsmtap_source_init("localhost", GSMTAP_UDP_PORT, 1);
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if (fl1h->gsmtap)
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gsmtap_source_add_sink(fl1h->gsmtap);
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return fl1h;
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}
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int l1if_close_pdch(void *obj)
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{
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struct femtol1_hdl *fl1h = obj;
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if (fl1h)
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l1if_transport_close(MQ_PDTCH_WRITE, fl1h);
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talloc_free(fl1h);
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return 0;
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}
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