Attention is currently required from: laforge, pespin.

fixeria has posted comments on this change. ( 
https://gerrit.osmocom.org/c/libosmo-sccp/+/35796?usp=email )

Change subject: Implement M3UA-over-TCP (in addition to SCTP)
......................................................................


Patch Set 1:

(6 comments)

Patchset:

PS1:
> I wonder whether we really want to add/maintain a 
> "OSMO_SS7_ASP_PROT_M3UA_TCP" type ...

I am open for suggestions. I see nothing wrong with adding a new 
`OSMO_SS7_ASP_PROT_*` entry, because it's more linear and comfortable to use 
than additionally having to check for some boolean flag across the 
structure(s). This also let's the VTY users to select M3UA-over-TCP using the 
existing VTY command(s). Adding a boolean flag means adding more VTY commands 
(not just one) for selecting the transport, which would only apply to 
`OSMO_SS7_ASP_PROT_M3UA`.


File src/osmo_ss7_vty.c:

https://gerrit.osmocom.org/c/libosmo-sccp/+/35796/comment/5a4be849_33f8b54e
PS1, Line 62:   "MTP3 User Adaptation (SCTP)\n" \
> As mentioned in earlier patches, you can remove the "SCTP" stuff. […]
IMO, it does not hurt to clarify in command documentation which option of the 
two with similar names is using which transport.


https://gerrit.osmocom.org/c/libosmo-sccp/+/35796/comment/abfcda5a_2803213a
PS1, Line 1994:         "Display all M3UA (SCTP and TCP) ASs\n"
> drop "SCTP and TCP".
Likewise here, I wanted to make it clear that all M3UA entries are shown, not 
only those using SCTP as the transport. Because in other commands `m3ua` means 
M3UA-over-SCTP, and it may be confusing to those using SCTP-over-TCP.


https://gerrit.osmocom.org/c/libosmo-sccp/+/35796/comment/c8a1948c_499a1666
PS1, Line 2013:                 if (filter && !strcmp(filter, "m3ua")) {
> sounds like this can be moved into a "bool only_m3ua" out of the loop. […]
Sounds like it, but should I really spend more time optimizing this code path?


File src/osmo_ss7_xua_srv.c:

https://gerrit.osmocom.org/c/libosmo-sccp/+/35796/comment/c9a5ee4c_9ed5b640 
PS1, Line 168:  if (ss7_asp_proto_to_ip_proto(asp->cfg.proto) == IPPROTO_SCTP) {
> you wanna name this probably "ss7_asp_proto_to_ipproto" (see "ipproto" 
> instead of "ip_proto")
Why would I name something that already exists? So you suggest to rename 
existing API? Sounds like a purely cosmetic change to me, which is not directly 
related to this patch.


File src/xua_rkm.c:

https://gerrit.osmocom.org/c/libosmo-sccp/+/35796/comment/cb772cc9_058a008f
PS1, Line 240: M3UA-over-SCTP or M3UA-over-TCP?  Can we use asp->cfg.proto 
maybe?
> I'd keep the usual one to mean sctp, and probably add something else for tcp.
The question here is not whether we leave `OSMO_SS7_ASP_PROT_*` unchanged and 
add a boolean flag. It's a more fundamental question why are we hard-coding 
M3UA here, while there can also be XUA and IPA. I am not familiar with the code 
base, so I am asking for clarification. I can only guess that dynamic RKM allow 
is only allowed for M3UA?



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Gerrit-Project: libosmo-sccp
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Gerrit-Change-Id: I8c76d271472befacbeb998a93bbdc9e8660d9b5d
Gerrit-Change-Number: 35796
Gerrit-PatchSet: 1
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