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authorAlexander Couzens <lynxis@fe80.eu>2021-01-20 17:42:48 +0100
committerAlexander Couzens <lynxis@fe80.eu>2021-02-16 16:29:47 +0100
commit4f1128fcbd462fc5b7fe900d2daa09576e308736 (patch)
tree60ee7914864059af0ccb375a43268a02a8ede5be /include/osmocom
parent524898504af2251b740be9621d184db1b9b875ee (diff)
gprs_ns2: inform the NS user (BSSGP) about the MTU of a NSE
The BSSGP layer needs to know the MTU of the NS UNIDATA payload. The MTU can be 0 if the NSE doesn't contain any NSVC. Every status indication will contain the mtu value. The MTU in the status indication contains the maximum transfer unit of a BSSGP message. From NS side the maximum SDU. Related: OS#4889 Change-Id: I5016b295db6185ec131d83089cf6c806e34ef1b6
Diffstat (limited to 'include/osmocom')
-rw-r--r--include/osmocom/gprs/frame_relay.h5
-rw-r--r--include/osmocom/gprs/gprs_ns2.h3
2 files changed, 8 insertions, 0 deletions
diff --git a/include/osmocom/gprs/frame_relay.h b/include/osmocom/gprs/frame_relay.h
index 1be37eec..e3167070 100644
--- a/include/osmocom/gprs/frame_relay.h
+++ b/include/osmocom/gprs/frame_relay.h
@@ -39,6 +39,11 @@ enum osmo_fr_role {
FR_ROLE_NETWORK_EQUIPMENT,
};
+/* 48.016 ยง 6.1.4.2 default maximum information field size of 1600 octets */
+#define FRAME_RELAY_MTU 1600
+/* FR DLC header is 2 byte */
+#define FRAME_RELAY_SDU (FRAME_RELAY_MTU - 2)
+
extern const struct value_string osmo_fr_role_names[];
static inline const char *osmo_fr_role_str(enum osmo_fr_role role) {
diff --git a/include/osmocom/gprs/gprs_ns2.h b/include/osmocom/gprs/gprs_ns2.h
index 07e6c451..b406bb0d 100644
--- a/include/osmocom/gprs/gprs_ns2.h
+++ b/include/osmocom/gprs/gprs_ns2.h
@@ -84,6 +84,7 @@ enum gprs_ns2_affecting_cause {
GPRS_NS2_AFF_CAUSE_SNS_CONFIGURED,
GPRS_NS2_AFF_CAUSE_SNS_FAILURE,
GPRS_NS2_AFF_CAUSE_SNS_NO_ENDPOINTS,
+ GPRS_NS2_AFF_CAUSE_MTU_CHANGE,
};
extern const struct value_string gprs_ns2_aff_cause_prim_strs[];
@@ -135,6 +136,8 @@ struct osmo_gprs_ns2_prim {
/* Only true on the first time it's available.
* Allow the BSSGP layer to reset persistent NSE */
bool first;
+ /* MTU of a NS SDU. It's the lowest MTU of all (alive & dead) NSVCs */
+ uint16_t mtu;
} status;
} u;
};