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
diff --git a/src/gb/gprs_ns2_frgre.c b/src/gb/gprs_ns2_frgre.c
index 177aeb2..62d87a4 100644
--- a/src/gb/gprs_ns2_frgre.c
+++ b/src/gb/gprs_ns2_frgre.c
@@ -572,6 +572,10 @@
bind->send_vc = frgre_vc_sendmsg;
bind->free_vc = free_vc;
bind->nsi = nsi;
+ /* TODO: allow to set the MTU via vty. It can not be automatic detected because it goes over an
+ * ethernet device and the MTU here must match the FR side of the FR-to-GRE gateway.
+ */
+ bind->mtu = FRAME_RELAY_SDU;
priv = bind->priv = talloc_zero(bind, struct priv_bind);
if (!priv) {