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pcu_sock: Forward imm.ass PCU originated messages 

The PCU sends imm.ass messages in response to a rach request. Those
messages need to be forwarded to RSL in order to get them send. This
commit introduces the required functionality for that

Change-Id: Ice099c4ed7008200ed179e581aba1899c6c29455
This commit is contained in:
Philipp Maier 2016-12-02 19:04:34 +01:00 committed by Harald Welte
parent f14cb3535c
commit f8aeb2cccb
4 changed files with 59 additions and 0 deletions
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4
openbsc/include/openbsc/pcu_if.h
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@ -24,6 +24,10 @@ int pcu_tx_rach_ind(struct gsm_bts *bts, int16_t qta, uint16_t ra, uint32_t fn,
/* Confirm the sending of an immediate assignment to the pcu */
int pcu_tx_imm_ass_sent(struct gsm_bts *bts, uint32_t tlli);
/* Confirm the sending of an immediate assignment to the pcu */
int pcu_tx_imm_ass_sent(struct gsm_bts *bts, uint32_t tlli);
/* Open connection to PCU */
int pcu_sock_init(const char *path, struct gsm_bts *bts);

17
openbsc/include/openbsc/pcuif_proto.h
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@ -7,6 +7,7 @@
#define PCU_IF_MSG_DATA_REQ 0x00 /* send data to given channel */
#define PCU_IF_MSG_DATA_CNF 0x01 /* confirm (e.g. transmission on PCH) */
#define PCU_IF_MSG_DATA_IND 0x02 /* receive data from given channel */
#define PCU_IF_MSG_DATA_CNF_DT 0x11 /* confirm (with direct tlli) */
#define PCU_IF_MSG_RTS_REQ 0x10 /* ready to send request */
#define PCU_IF_MSG_RACH_IND 0x22 /* receive RACH */
#define PCU_IF_MSG_INFO_IND 0x32 /* retrieve BTS info */
@ -56,6 +57,21 @@ struct gsm_pcu_if_data {
int16_t lqual_cb; /* !< \brief Link quality in centiBel */
} __attribute__ ((packed));
/* data confirmation with direct tlli (instead of raw mac block with tlli) */
struct gsm_pcu_if_data_cnf_dt {
uint8_t sapi;
uint32_t tlli;
uint32_t fn;
uint16_t arfcn;
uint8_t trx_nr;
uint8_t ts_nr;
uint8_t block_nr;
int8_t rssi;
uint16_t ber10k; /*!< \brief BER in units of 0.01% */
int16_t ta_offs_qbits; /* !< \brief Burst TA Offset in quarter bits */
int16_t lqual_cb; /* !< \brief Link quality in centiBel */
} __attribute__ ((packed));
struct gsm_pcu_if_rts_req {
uint8_t sapi;
uint8_t spare[3];
@ -146,6 +162,7 @@ struct gsm_pcu_if {
union {
struct gsm_pcu_if_data data_req;
struct gsm_pcu_if_data data_cnf;
struct gsm_pcu_if_data_cnf_dt data_cnf_dt;
struct gsm_pcu_if_data data_ind;
struct gsm_pcu_if_rts_req rts_req;
struct gsm_pcu_if_rach_ind rach_ind;

17
openbsc/src/libbsc/abis_rsl.c
View File

@ -1993,6 +1993,7 @@ static int abis_rsl_rx_cchan(struct msgb *msg)
struct e1inp_sign_link *sign_link = msg->dst;
struct abis_rsl_dchan_hdr *rslh = msgb_l2(msg);
int rc = 0;
uint32_t tlli;
msg->lchan = lchan_lookup(sign_link->trx, rslh->chan_nr,
"Abis RSL rx CCHAN: ");
@ -2013,6 +2014,22 @@ static int abis_rsl_rx_cchan(struct msgb *msg)
LOGP(DRSL, LOGL_NOTICE, "Unimplemented Abis RSL TRX message "
"type 0x%02x\n", rslh->c.msg_type);
break;
case 0x10: /* Ericsson specific: Immediate Assign Sent */
/* FIXME: Replace the messy message parsing below
* with proper TV parser */
LOGP(DRSL, LOGL_INFO, "IMM.ass sent\n");
if(msg->len < 8)
LOGP(DRSL, LOGL_ERROR, "short IMM.ass sent message!\n");
else if(msg->data[4] != 0xf1)
LOGP(DRSL, LOGL_ERROR, "unsupported IMM.ass message format! (please fix)\n");
else {
tlli = msg->data[8];
tlli |= msg->data[7] << 8;
tlli |= msg->data[6] << 16;
tlli |= msg->data[5] << 24;
pcu_tx_imm_ass_sent(sign_link->trx->bts, tlli);
}
break;
default:
LOGP(DRSL, LOGL_NOTICE, "Unknown Abis RSL TRX message type "
"0x%02x\n", rslh->c.msg_type);

21
openbsc/src/libbsc/pcu_sock.c
View File

@ -286,6 +286,27 @@ int pcu_tx_rach_ind(struct gsm_bts *bts, int16_t qta, uint16_t ra, uint32_t fn,
return pcu_sock_send(bts, msg);
}
/* Confirm the sending of an immediate assignment to the pcu */
int pcu_tx_imm_ass_sent(struct gsm_bts *bts, uint32_t tlli)
{
struct msgb *msg;
struct gsm_pcu_if *pcu_prim;
struct gsm_pcu_if_data_cnf_dt *data_cnf_dt;
LOGP(DPCU, LOGL_INFO, "Sending PCH confirm with direct TLLI\n");
msg = pcu_msgb_alloc(PCU_IF_MSG_DATA_CNF_DT, bts->nr);
if (!msg)
return -ENOMEM;
pcu_prim = (struct gsm_pcu_if *) msg->data;
data_cnf_dt = &pcu_prim->u.data_cnf_dt;
data_cnf_dt->sapi = PCU_IF_SAPI_PCH;
data_cnf_dt->tlli = tlli;
return pcu_sock_send(bts, msg);
}
/* we need to decode the raw RR paging messsage (see PCU code
* Encoding::write_paging_request) and extract the mobile identity
* (P-TMSI) from it */