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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi Piotr,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">To clarify a few things,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">* The rc_pingong.c example in fabtests uses OFI connection management APIs (<a href="https://ofiwg.github.io/libfabric/master/man/fi_cm.3.html">https://ofiwg.github.io/libfabric/master/man/fi_cm.3.html</a>)
to establish a connection between two FI_EP_MSG endpoints.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">* The OFI verbs provider internally uses rdmacm to connect IB queue pairs and is not visible to apps using OFI.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">* AVs are used only for unconnected endpoint types (FI_EP_RDM and FI_EP_DGRAM).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">To run a simple hello program with a client and server, the client needs to know the server’s IPoIB address. You can take a look at the example in simple/msg.c
in fabtests. This example uses FI_EP_MSG endpoint type. The apps need not exchange IB addresses since that would be handled by OFI verbs. For now, OFI verbs support only tagged messages (FI_TAGGED capability flag) for FI_EP_RDM endpoint type. Please take a
look at benchmarks/rdm_tagged_pingpong.c for an example.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I hope this helps. Let me know if you have more questions.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Arun.<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></a></p>
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<p class="MsoNormal"><a name="_____replyseparator"></a><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Libfabric-users [mailto:libfabric-users-bounces@lists.openfabrics.org]
<b>On Behalf Of </b>LESNICKI, PIOTR<br>
<b>Sent:</b> Thursday, September 01, 2016 10:55 AM<br>
<b>To:</b> libfabric-users@lists.openfabrics.org<br>
<b>Subject:</b> [libfabric-users] Using the verbs provider with manual address exchange<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black">Hi,<br>
<br>
I'm new to OFI, and I am writing a simple hello program in IB.<br>
<br>
Looking at the example in fabtests, rc_pingpong.c uses RDMACM to<br>
connect to peers. How do I do the address exchange myself ?<br>
<br>
I tried to write something with AVs based on the tutorial/starting<br>
guide, but maybe it is only for unconnected endpoints. Using AVs I can<br>
get something working with sockets (though without the CQs) but not<br>
with the verbs provider (fi_av_open is unimplemented with FI_MSG, and<br>
with FI_RDM I can't get a verbs fabric object).<br>
<br>
fi_info gives me:<br>
provider: verbs<br>
fabric: IB-0x80fe<br>
domain: mlx4_0<br>
version: 1.0<br>
type: FI_EP_MSG<br>
protocol: FI_PROTO_RDMA_CM_IB_RC<br>
provider: verbs<br>
fabric: IB-0x80fe<br>
domain: mlx4_0-rdm<br>
version: 1.0<br>
type: FI_EP_RDM<br>
protocol: FI_PROTO_IB_RDM<br>
<br>
Thanks for some clarifications,<br>
Piotr<br>
<br>
<br>
<o:p></o:p></span></p>
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