bsc_api: Add some more comments to the code
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@ -270,6 +270,7 @@ int bsc_api_init(struct gsm_network *network, struct bsc_api *api)
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return 0;
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}
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/*! \brief process incoming 08.08 DTAP from MSC (send via BTS to MS) */
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int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn,
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struct msgb *msg, int link_id, int allow_sach)
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{
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@ -294,7 +295,9 @@ int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn,
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}
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msg->l3h = msg->data;
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/* is requested SAPI already up? */
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if (conn->lchan->sapis[sapi] == LCHAN_SAPI_UNUSED) {
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/* Establish L2 for additional SAPI */
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OBSC_LINKID_CB(msg) = link_id;
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if (rll_establish(msg->lchan, sapi, rll_ind_cb, msg) != 0) {
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msgb_free(msg);
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@ -303,6 +306,7 @@ int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn,
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}
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return 0;
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} else {
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/* Directly forward via RLL/RSL to BTS */
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return rsl_data_request(msg, link_id);
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}
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}
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@ -469,6 +473,7 @@ static void dispatch_dtap(struct gsm_subscriber_connection *conn,
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api->dtap(conn, link_id, msg);
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}
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/*! \brief RSL has received a DATA INDICATION with L3 from MS */
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int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id)
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{
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int rc;
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@ -484,8 +489,11 @@ int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id)
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if (lchan->conn) {
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/* if we already have a connection, forward via DTAP to
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* MSC */
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dispatch_dtap(lchan->conn, link_id, msg);
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} else {
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/* allocate a new connection */
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rc = BSC_API_CONN_POL_REJECT;
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lchan->conn = subscr_con_allocate(msg->lchan);
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if (!lchan->conn) {
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@ -493,6 +501,7 @@ int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id)
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return -1;
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}
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/* fwd via bsc_api to send COMPLETE L3 INFO to MSC */
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rc = api->compl_l3(lchan->conn, msg, 0);
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if (rc != BSC_API_CONN_POL_ACCEPT) {
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@ -505,6 +514,7 @@ int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id)
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return 0;
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}
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/*! \brief We received a GSM 08.08 CIPHER MODE from the MSC */
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int gsm0808_cipher_mode(struct gsm_subscriber_connection *conn, int cipher,
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const uint8_t *key, int len, int include_imeisv)
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{
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