cosmetic: a_iface: Harmonize log statements

Clean up the log statements in a_iface*.c, which was very inconsistent.
For example "BSC sending" is very confusing.  We are receiving from the BSC,
and it did already send the message, it is no longer in the process of
sending it if we have already received it in the MSC.

Change-Id: Id50e964d86713ae506d4e7657159797e09501d99
diff --git a/src/libmsc/a_iface.c b/src/libmsc/a_iface.c
index 64036be..0e6c247 100644
--- a/src/libmsc/a_iface.c
+++ b/src/libmsc/a_iface.c
@@ -179,7 +179,7 @@
 	uint8_t crm = 0x01;
 
 	OSMO_ASSERT(conn);
-	LOGPCONN(conn, LOGL_DEBUG, "Cipher Mode Command to BSC, %u ciphers (%s)",
+	LOGPCONN(conn, LOGL_DEBUG, "Tx BSSMAP CIPHER MODE COMMAND to BSC, %u ciphers (%s)",
 		 ei->perm_algo_len, osmo_hexdump_nospc(ei->perm_algo, ei->perm_algo_len));
 	LOGPC(DMSC, LOGL_DEBUG, " key %s\n", osmo_hexdump_nospc(ei->key, ei->key_len));
 
@@ -211,7 +211,7 @@
 	llist_for_each_entry(bsc_ctx, &gsm_network->a.bscs, list) {
 		if (a_reset_conn_ready(bsc_ctx->reset)) {
 			LOGP(DMSC, LOGL_DEBUG,
-			     "Passing paging message from MSC %s to BSC %s (imsi=%s, tmsi=0x%08x, lac=%u)\n",
+			     "Tx BSSMAP paging message from MSC %s to BSC %s (imsi=%s, tmsi=0x%08x, lac=%u)\n",
 			     osmo_sccp_addr_name(ss7, &bsc_ctx->msc_addr),
 			     osmo_sccp_addr_name(ss7, &bsc_ctx->bsc_addr), imsi, tmsi, lac);
 			msg = gsm0808_create_paging(imsi, &tmsi, &cil, NULL);
@@ -380,7 +380,7 @@
 	conn = trans->conn;
 	OSMO_ASSERT(conn);
 
-	LOGPCONN(conn, LOGL_DEBUG, "Sending Assignment Command to BSC\n");
+	LOGPCONN(conn, LOGL_DEBUG, "Tx BSSMAP ASSIGNMENT COMMAND to BSC\n");
 
 	/* Channel type */
 	rc = enc_channel_type(&ct, &trans->bearer_cap);
@@ -425,7 +425,7 @@
 {
 	struct msgb *msg;
 
-	LOGPCONN(conn, LOGL_INFO, "Sending Clear command to BSC\n");
+	LOGPCONN(conn, LOGL_INFO, "Tx BSSMAP CLEAR COMMAND to BSC\n");
 
 	msg = gsm0808_create_clear_command(GSM0808_CAUSE_CALL_CONTROL);
 	return osmo_sccp_tx_data_msg(conn->a.scu, conn->a.conn_id, msg);
@@ -448,7 +448,7 @@
 	/* Send reset to the remote BSC */
 	ss7 = osmo_ss7_instance_find(gsm_network->a.cs7_instance);
 	OSMO_ASSERT(ss7);
-	LOGP(DMSC, LOGL_NOTICE, "Sending RESET to BSC %s\n", osmo_sccp_addr_name(ss7, &bsc_ctx->bsc_addr));
+	LOGP(DMSC, LOGL_NOTICE, "Tx BSSMAP RESET to BSC %s\n", osmo_sccp_addr_name(ss7, &bsc_ctx->bsc_addr));
 	msg = gsm0808_create_reset();
 	osmo_sccp_tx_unitdata_msg(bsc_ctx->sccp_user, &bsc_ctx->msc_addr,
 				  &bsc_ctx->bsc_addr, msg);