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<p>Dear Lincoln,</p>
<p>Thank you very much for providing this reference.</p>
<p>I've to admit that I didn't know about this library but I'm
looking into it <br>
but I have some questions/concerns.</p>
<p>This library seems to be abandoned since 2 years, at least this
is what I<br>
see from both the documentation and also their version control
system:<br>
<a href="https://gerrit.o-ran-sc.org/r/gitweb?p=o-du%2Fphy.git;a=summary">https://gerrit.o-ran-sc.org/r/gitweb?p=o-du%2Fphy.git;a=summary<br>
</a>Do you think it's still reliable?</p>
<p>The assumptions seems to be quite restrictive on the HW
requirements of<br>
this library listed here: <a href="https://docs.o-ran-sc.org/projects/o-ran-sc-o-du-phy/en/latest/Assumptions_Dependencies.html#requirements">https://docs.o-ran-sc.org/projects/o-ran-sc-o-du-phy/en/latest/Assumptions_Dependencies.html#requirements<br>
</a>With my experiments I'm just exploring using virtual
interfaces and my HW,<br>
I would like to avoid those constraints.</p>
<p>From what I can see some of the data structures already provided
by DPDK<br>
are re-defined by this library, like the eth header data structure
and the eCPRI header.<br>
I don't know if this is due to implementation reasons or because
it has been <br>
built with an old version of DPDK.<br>
But without taking in consideration the endianess like rte_ecpri.h
already does in DPDK<br>
and without supporting some msg types (line 94 file xran_pkt.h).<br>
</p>
<p>Digging into the source code a bit I found some of the data
structures I'm referring to<br>
in my original message, i.e. the ecpri Seq. ID. The following code
puzzles me, source file at:<br>
<a href="https://gerrit.o-ran-sc.org/r/gitweb?p=o-du/phy.git;a=blob;f=fhi_lib/lib/api/xran_pkt.h;h=314b8d6b7d08f153369de5ad535702f50a574a35;hb=HEAD" class="moz-txt-link-freetext">https://gerrit.o-ran-sc.org/r/gitweb?p=o-du/phy.git;a=blob;f=fhi_lib/lib/api/xran_pkt.h;h=314b8d6b7d08f153369de5ad535702f50a574a35;hb=HEAD</a><br>
line 228:<br>
struct xran_ecpri_hdr<br>
{<br>
union xran_ecpri_cmn_hdr cmnhdr;<br>
rte_be16_t ecpri_xtc_id; /**< 3.1.3.1.6 real
time control data / IQ data transfer message series identifier */<br>
union ecpri_seq_id ecpri_seq_id; /**< 3.1.3.1.7 message
identifier */<br>
} __rte_packed;</p>
<p>Seems strange to me that ecpri_xtc_id is not a data structure on
it's own, providing access to DU port, Band Sector etc.<br>
Also, the 'xran_pkt_comm_hdr' data structure at line 336 assumes
that the packet doesn't have a VLAN header, but,<br>
I don't know if this is managed elsewhere.</p>
<p>Given all that, I'm still of the idea that could be useful to
have those kind of headers directly in DPDK<br>
but I'm open to reconsider my statement, please let me know if you
have more information regarding<br>
this library.</p>
<p>Best regards,<br>
Mattia<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 28/05/2024 16:37, Lincoln Lavoie
wrote:<br>
</div>
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<div class="gmail_default" style="font-size:small">Hi Mattia,</div>
<div class="gmail_default" style="font-size:small"><br>
</div>
<div class="gmail_default" style="font-size:small">Have you
looked into the O-RAN OSC open fronthaul phy
implementation? </div>
<div class="gmail_default" style="font-size:small"><a href="https://docs.o-ran-sc.org/projects/o-ran-sc-o-du-phy/en/latest/Architecture-Overview_fh.html" moz-do-not-send="true" class="moz-txt-link-freetext">https://docs.o-ran-sc.org/projects/o-ran-sc-o-du-phy/en/latest/Architecture-Overview_fh.html</a><br>
</div>
<div class="gmail_default" style="font-size:small"><br>
</div>
<div class="gmail_default" style="font-size:small">Cheers,<br>
Lincoln</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, May 28, 2024 at
10:31 AM Mattia Milani <<a href="mailto:mattia.milani@nokia.com" moz-do-not-send="true" class="moz-txt-link-freetext">mattia.milani@nokia.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Dear DPDK Dev community,<br>
<br>
I hope this is the correct mailing list for my questions,
otherwise <br>
please excuse me and let me know where my questions should
be posted.<br>
<br>
I was looking for a data structure capable to manage O-RAN
Fronthaul <br>
CUS-U headers (attached a screenshot of the header
structure form a <br>
packet analyzed with Wireshark)<br>
but I couldn't find one.<br>
<br>
I would like to be capable to identify the different port
ids but also <br>
the number of PRBs in the section part.<br>
<br>
I wrote my own implementation for a simple use case (I
don't take in <br>
consideration different versions and or data directions)<br>
but it's enough for me at the moment.<br>
<br>
What I wanted to ask is the following:<br>
- Does a data structure for this kind of header already
exists?<br>
- If it doesn't exists is it planned?<br>
- If it's not planned could it be of some interest?<br>
<br>
If there is interest I would be happy to share what I
developed up to <br>
now to receive comments and/or assistance on how to make
it fully <br>
functioning.<br>
<br>
Best regards,<br>
Mattia<br>
</blockquote>
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<div><b>Lincoln Lavoie</b><br>
</div>
<div>Principal Engineer, Broadband
Technologies</div>
<div>21 Madbury Rd., Ste. 100, Durham, NH
03824</div>
<div><a href="mailto:lylavoie@iol.unh.edu" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">lylavoie@iol.unh.edu</a></div>
<div><a href="https://www.iol.unh.edu" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">https://www.iol.unh.edu</a></div>
<div>+1-603-674-2755 (m)</div>
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