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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'>Voltaire has developed the LSP for
Multicast Offload. Fast data path will use this service provider working on IB
using ibal.dll. <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'>Original service provider TCP/IPoIB is
using to transfer IGMP requests to Ethernet routers which may be connected to IB
host through IPR.<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'>IB join will come from user mode and from
IPoIB too. The common place for them is in the ibal.lib.<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'>To improve performance of HCA on receive
path, IPoIB does not issue ATTACH to the group which already attached from user
mode by LSP.<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 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>This leads me back to my original suggestion of simply
having a parameter on the join multicast group that indicates if the QP should
be attached. This is way simpler and moves the complexity of determining when
to attach to the ULP, where it belongs.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>- Sean<o:p></o:p></span></font></p>
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