Attention is currently required from: neels, laforge. pespin has posted comments on this change. ( https://gerrit.osmocom.org/c/osmo-hnbgw/+/28816 )

Change subject: add ps_rab_ass FSM to map GTP via UPF ......................................................................

Patch Set 2:

(1 comment)

File include/osmocom/hnbgw/hnbgw.h:

https://gerrit.osmocom.org/c/osmo-hnbgw/+/28816/comment/6f1e3d4a_970dc740 PS2, Line 193: /* Return true when the user configured GTP mapping to be enabled, by configuring a PFCP link to a UPF.

I'm not following you, pau. […]

I we should not allow running osmo-hnbgw without proxying GTP through it (in detail, through its associated UPF).

I am referring to the problem described for the need of a GTP-u proxy in the SGSN in OS#5154 and SYS#5389, SYS#5435. You also referenced a need for it in osmo-hnbgw in the decription of the task this commit is about (OS#5153).

I think the main issue in this case would be what's described in SYS#5435 case "B]": "SGSN sending to nano3G GGSN's TEI which is changing after UpdatePDPCtxResp" but this time applied to HNBGW and hNodeB.