daniel has posted comments on this change. ( https://gerrit.osmocom.org/c/osmo-ggsn/+/35084?usp=email )

Change subject: gtp: Add net GTP cause values and a function to check for success ......................................................................

Patch Set 2:

(2 comments)

File gtp/gtp.h:

https://gerrit.osmocom.org/c/osmo-ggsn/+/35084/comment/f62b203f_67e652e1 PS2, Line 106: #define GTPCAUSE_129 129 /* For future use 129-176 */

You broke the API compat here. […]

I'm not opposed, but then that would mean removing all eight of these defines:

```c #define GTPCAUSE_006 6 /* For future use 6-48 */ #define GTPCAUSE_049 49 /* Cause values reserved for GPRS charging protocol use (See GTP' in GSM 12.15) 49-63 */ #define GTPCAUSE_064 64 /* For future use 64-127 */ #define GTPCAUSE_131 131 /* For future use 131-176 */ #define GTPCAUSE_177 177 /* Cause values reserved for GPRS charging protocol use (See GTP' In GSM 12.15) 177-191 */ #define GTPCAUSE_198 198 /* For future use */ #define GTPCAUSE_221 221 /* For Future Use 221-240 */ #define GTPCAUSE_241 241 /* Cause Values Reserved For Gprs Charging Protocol Use (See Gtp' In Gsm 12.15) 241-255 */ ```

Having one value defined for a range is pretty useless anyway.

https://gerrit.osmocom.org/c/osmo-ggsn/+/35084/comment/b39e4a66_057fb93c PS2, Line 142: static inline bool gtp_cause_successful(uint8_t cause)

not sure this is really useful to have here, I'd would have left it for the specific app. […]

It's used directly in libgtp as well: https://gerrit.osmocom.org/c/osmo-ggsn/+/35125