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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi Sean,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>></span></font><font color=blue
face=Arial><span style='font-family:Arial;color:blue'> The communication of
this policy needs to be between ipoib and the application that doesn’t want
it to attach.</span></font><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>How the application can communicate
directly with IPoIB?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Are you thinking about some interface that
will be exposed by IPoIB to applications/IBAL (like by the join API) ?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I think that a limitation of “use
user space MC only” or “use IPoIB only” per specific MC group
is acceptable by our customers at list for first version…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Yiftah<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
ofw-bounces@lists.openfabrics.org [mailto:ofw-bounces@lists.openfabrics.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Sean Hefty<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, July 02, 2008
18:38<br>
<b><span style='font-weight:bold'>To:</span></b> Slava Strebkov; Fab Tillier;
ofw@lists.openfabrics.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [ofw] [owf][patch]
user multicast offload support</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'>
<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>>This leads me back to my original suggestion of simply having a<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>>parameter on the join multicast group that indicates if the QP
should be<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>>attached. This is way simpler and moves the complexity of
determining<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>>when to attach to the ULP, where it belongs.<o:p></o:p></span></font></p>
<p class=MsoPlainText><b><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-weight:bold'>Multicast group opened from user mode
is always attached. Attachment of groups from IPoIB depends on whether same
group was attached previously from user mode. IPoIB does not know this.<o:p></o:p></span></font></b></p>
<p class=MsoPlainText><font size=2 color=navy face="Courier New"><span
style='font-size:10.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>There’s something
fundamentally wrong with this approach. You’re moving policy into
the verb layer to determine if a request from a kernel client should or should
not attach its QP to the multicast group. The communication of this
policy needs to be between ipoib and the application that doesn’t want it
to attach.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>- Sean<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'><o:p> </o:p></span></font></p>
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