Add check of lifetime of LLC frame

If lifetime expires of queued LLC frames, they are discarded. The number
of discarded frames and the sum of their octets are reported to SGSN
via LLC-DISCARDED message.

The lifetime can be overridden via VTY. The value can be centi-seconds
or "infinite".

1 files changed, 50 insertions, 0 deletions

diff --git a/src/pcu_vty.c b/src/pcu_vty.c
index 179080bb..2413f21d 100644
--- a/src/pcu_vty.c
+++ b/src/pcu_vty.c
@@ -81,6 +81,11 @@ static int config_write_pcu(struct vty *vty)
 	vty_out(vty, "pcu%s", VTY_NEWLINE);
 	if (bts->force_cs)
 		vty_out(vty, " cs %d%s", bts->initial_cs, VTY_NEWLINE);
+	if (bts->force_llc_lifetime == 0xffff)
+		vty_out(vty, " queue lifetime infinite%s", VTY_NEWLINE);
+	else if (bts->force_llc_lifetime)
+		vty_out(vty, " queue lifetime %d%s", bts->force_llc_lifetime,
+			VTY_NEWLINE);
 }
 
 /* per-BTS configuration */
@@ -120,6 +125,48 @@ DEFUN(cfg_pcu_no_cs,
 	return CMD_SUCCESS;
 }
 
+#define QUEUE_STR "Packet queue options\n"
+#define LIFETIME_STR "Set lifetime limit of LLC frame in centi-seconds " \
+	"(overrides the value given by SGSN)\n"
+
+DEFUN(cfg_pcu_queue_lifetime,
+      cfg_pcu_queue_lifetime_cmd,
+      "queue lifetime <1-65534>",
+      QUEUE_STR LIFETIME_STR "Lifetime in centi-seconds")
+{
+	struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+	uint8_t csec = atoi(argv[0]);
+
+	bts->force_llc_lifetime = csec;
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(cfg_pcu_queue_lifetime_inf,
+      cfg_pcu_queue_lifetime_inf_cmd,
+      "queue lifetime infinite",
+      QUEUE_STR LIFETIME_STR "Infinite lifetime")
+{
+	struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+
+	bts->force_llc_lifetime = 0xffff;
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(cfg_pcu_no_queue_lifetime,
+      cfg_pcu_no_queue_lifetime_cmd,
+      "no queue lifetime",
+      NO_STR QUEUE_STR "Disable lifetime limit of LLC frame (use value given "
+      "by SGSN)\n")
+{
+	struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+
+	bts->force_llc_lifetime = 0;
+
+	return CMD_SUCCESS;
+}
+
 static const char pcu_copyright[] =
 	"Copyright (C) 2012 by ...\r\n"
 	"License GNU GPL version 2 or later\r\n"
@@ -145,6 +192,9 @@ int pcu_vty_init(const struct log_info *cat)
 	install_default(PCU_NODE);
 	install_element(PCU_NODE, &cfg_pcu_cs_cmd);
 	install_element(PCU_NODE, &cfg_pcu_no_cs_cmd);
+	install_element(PCU_NODE, &cfg_pcu_queue_lifetime_cmd);
+	install_element(PCU_NODE, &cfg_pcu_queue_lifetime_inf_cmd);
+	install_element(PCU_NODE, &cfg_pcu_no_queue_lifetime_cmd);
 	install_element(PCU_NODE, &ournode_end_cmd);
 
 	return 0;