pcu_sock: Forward paging request from PCU via RSL to BTS

Change-Id: I28bf0995699618f3f5fa15fc8e1733beddfc482f
This commit is contained in:
Harald Welte 2016-11-17 20:54:47 +01:00
parent e586f41692
commit 854bcc2b7b
1 changed files with 44 additions and 9 deletions

View File

@ -284,6 +284,39 @@ int pcu_tx_rach_ind(struct gsm_bts *bts, int16_t qta, uint16_t ra, uint32_t fn,
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 */
static int pcu_rx_rr_paging(struct gsm_bts *bts, uint8_t paging_group,
const uint8_t *raw_rr_msg)
{
struct gsm48_hdr *gsmh = (struct gsm48_hdr *) raw_rr_msg;
struct gsm48_paging1 *p1 = (struct gsm48_paging1 *) gsmh;
uint8_t chan_needed;
unsigned int mi_len;
uint8_t *mi;
int rc;
switch (gsmh->msg_type) {
case GSM48_MT_RR_PAG_REQ_1:
chan_needed = (p1->cneed2 << 2) | p1->cneed1;
mi_len = p1->data[0];
mi = p1->data+1;
/* FIXME: why does rsl_paging_cmd add 2 to mi? */
rc = rsl_paging_cmd(bts, paging_group, mi_len, mi,
chan_needed, true);
break;
case GSM48_MT_RR_PAG_REQ_2:
case GSM48_MT_RR_PAG_REQ_3:
LOGP(DPCU, LOGL_ERROR, "PCU Sends unsupported paging "
"request type\n");
rc = -EINVAL;
break;
}
return rc;
}
static int pcu_rx_data_req(struct gsm_bts *bts, uint8_t msg_type,
struct gsm_pcu_if_data *data_req)
{
@ -291,6 +324,8 @@ static int pcu_rx_data_req(struct gsm_bts *bts, uint8_t msg_type,
struct gsm_bts_trx *trx;
struct gsm_bts_trx_ts *ts;
struct msgb *msg;
char imsi_digit_buf[4];
uint8_t pag_grp;
int rc = 0;
LOGP(DPCU, LOGL_DEBUG, "Data request received: sapi=%s arfcn=%d "
@ -300,15 +335,15 @@ static int pcu_rx_data_req(struct gsm_bts *bts, uint8_t msg_type,
switch (data_req->sapi) {
case PCU_IF_SAPI_PCH:
if (msg_type == PCU_IF_MSG_PAG_REQ) {
/* FIXME: Add function to schedule paging request.
* This might not be required, if PCU_IF_MSG_DATA_REQ
* is used instead. */
} else {
struct gsm_bts_role_bts *btsb = bts->role;
printf("paging_add_imm_ass(btsb->paging_state, data_req->data,data_req->len);\n");
}
/* the first three bytes are the last three digits of
* the IMSI, which we need to compute the paging group */
imsi_digit_buf[0] = data_req->data[0];
imsi_digit_buf[1] = data_req->data[1];
imsi_digit_buf[2] = data_req->data[2];
imsi_digit_buf[3] = '\0';
pag_grp = gsm0502_calc_paging_group(&bts->si_common.chan_desc,
str_to_imsi(imsi_digit_buf));
pcu_rx_rr_paging(bts, pag_grp, data_req->data+3);
break;
case PCU_IF_SAPI_AGCH:
msg = msgb_alloc(data_req->len, "pcu_agch");