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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>Sounds like a slight bit of confusion…<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>OFED verbs runs over a channel adapter. You have three choices of types of channel adapters to use –<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>An InfiniBand HCA<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>An iWARP RNIC,<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>RoCE<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>You asked about the relationship between IB and RoCE, so let’s leave iWARP aside for now.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>IB and RoCE are virtually equivalent, with one exception: an IB HCA runs over an InfiniBand switched fabric, whereas RoCE runs over an Ethernet layer 2 switched fabric. If you have written your application to run over the verbs API, you can use either RoCE or InfiniBand as the underlying transport. In other words, RoCE runs on an Ethernet NIC and IB runs on an InfiniBand HCA.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>Naturally, you cannot use InfiniBand on one end (e.g. client), and RoCE on the other (e.g. server). It’s one or the other.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>By ‘RDMA program’, I think what you mean is an application written directly to the Verbs API. It is possible to re-write a sockets program to run directly on RDMA verbs, or you can take advantage of some of the OFED ULPs to avoid some of that re-write.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>-Paul<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal align=left style='text-align:left;text-autospace:ideograph-numeric ideograph-other;word-break:normal'><b><span style='font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-family:"Tahoma","sans-serif"'> ewg-bounces@lists.openfabrics.org [mailto:ewg-bounces@lists.openfabrics.org] <b>On Behalf Of </b>Her, Il<br><b>Sent:</b> Wednesday, March 16, 2011 9:43 AM<br><b>To:</b> ewg@lists.openfabrics.org<br><b>Subject:</b> [ewg] is RoCEE for Infiniband HCA or Ethernet NIC?<o:p></o:p></span></p></div></div><p class=MsoNormal align=left style='text-align:left'><o:p> </o:p></p><p class=MsoNormal>Hello, ewg.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I heard that Socket program and RDMA program can communicate with each other by using RoCEE<o:p></o:p></p><p class=MsoNormal>Then does it work within Infiniband Network or Ethernet Network or both?<o:p></o:p></p><p class=MsoNormal>I’m confused whether RoCEE is for Infiniband HCA or Ethernet NIC.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>thank you.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal align=left style='text-align:left;text-autospace:ideograph-other;word-break:normal'><span lang=EN-IE style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Her, Il<o:p></o:p></span></p><p class=MsoNormal align=left style='text-align:left;text-autospace:ideograph-other;word-break:normal'><span lang=EN-IE style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Technology Consulting<o:p></o:p></span></p><p class=MsoNormal align=left style='text-align:left;text-autospace:ideograph-other;word-break:normal'><span lang=EN-IE style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Technology Service Korea<o:p></o:p></span></p><p class=MsoNormal align=left style='text-align:left;text-autospace:ideograph-other;word-break:normal'><span lang=EN-IE style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal align=left style='text-align:left;text-autospace:ideograph-other;word-break:normal'><span lang=EN-IE style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>TEL : +82-2-2199-4475<o:p></o:p></span></p><p class=MsoNormal align=left style='text-align:left;text-autospace:ideograph-other;word-break:normal'><span lang=EN-IE style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Mobile : +82-10-4765-5597<o:p></o:p></span></p><p class=MsoNormal align=left style='text-align:left;text-autospace:ideograph-other;word-break:normal'><span lang=EN-IE style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="mailto:choong-keun.yoo@hp.com">il.her@hp.com</a><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>