<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:p="urn:schemas-microsoft-com:office:powerpoint" xmlns:a="urn:schemas-microsoft-com:office:access" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema" xmlns:b="urn:schemas-microsoft-com:office:publisher" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:c="urn:schemas-microsoft-com:office:component:spreadsheet" xmlns:oa="urn:schemas-microsoft-com:office:activation" xmlns:html="http://www.w3.org/TR/REC-html40" xmlns:q="http://schemas.xmlsoap.org/soap/envelope/" xmlns:D="DAV:" xmlns:x2="http://schemas.microsoft.com/office/excel/2003/xml" xmlns:ois="http://schemas.microsoft.com/sharepoint/soap/ois/" xmlns:dir="http://schemas.microsoft.com/sharepoint/soap/directory/" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:dsp="http://schemas.microsoft.com/sharepoint/dsp" xmlns:udc="http://schemas.microsoft.com/data/udc" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sub="http://schemas.microsoft.com/sharepoint/soap/2002/1/alerts/" xmlns:ec="http://www.w3.org/2001/04/xmlenc#" xmlns:sp="http://schemas.microsoft.com/sharepoint/" xmlns:sps="http://schemas.microsoft.com/sharepoint/soap/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:udcxf="http://schemas.microsoft.com/data/udc/xmlfile" xmlns:wf="http://schemas.microsoft.com/sharepoint/soap/workflow/" xmlns:mver="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns:mrels="http://schemas.openxmlformats.org/package/2006/relationships" xmlns:ex12t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:ex12m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:Z="urn:schemas-microsoft-com:" xmlns:st="" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=Content-Type content="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 12 (filtered medium)">
<style>
<!--
/* Font Definitions */
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
tt
{mso-style-priority:99;
font-family:"Courier New";}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin-top:0in;
margin-right:0in;
margin-bottom:0in;
margin-left:.5in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.Section1
{page:Section1;}
/* List Definitions */
@list l0
{mso-list-id:124856487;
mso-list-type:hybrid;
mso-list-template-ids:1255859682 -500956550 67698691 67698693 67698689 67698691 67698693 67698689 67698691 67698693;}
@list l0:level1
{mso-level-start-at:7;
mso-level-number-format:bullet;
mso-level-text:-;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;
font-family:"Calibri","sans-serif";
mso-fareast-font-family:Calibri;
mso-bidi-font-family:"Times New Roman";}
ol
{margin-bottom:0in;}
ul
{margin-bottom:0in;}
-->
</style>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang=EN-US link=blue vlink=purple>
<div class=Section1>
<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'><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><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
general-bounces@lists.openfabrics.org
[mailto:general-bounces@lists.openfabrics.org] <b>On Behalf Of </b>Philip Frey1<br>
<b>Sent:</b> Wednesday, August 13, 2008 1:24 AM<br>
<b>To:</b> Steve Wise<br>
<b>Cc:</b> general@lists.openfabrics.org<br>
<b>Subject:</b> Re: [ofa-general] cxgb3: MW Support<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><br>
<tt><span style='font-size:10.0pt'>> Philip Frey1 wrote:</span></tt><span
style='font-size:10.0pt;font-family:"Courier New"'><br>
<tt>> ></tt><br>
<tt>> > Are memory windows supported by the Chelsio T3 adapter? If so,
what is </tt><br>
<tt>> > the verb to bind/unbind them?</tt><br>
<tt>> ></tt><br>
<tt>> </tt><br>
<tt>> MWs are supported in ofed-1.4, which is about the beta. The
support in </tt><br>
<tt>> linux/ofed is only for kernel-mode MWs. </tt><br>
<tt>> </tt><br>
<tt>> Are you doing user mode or kernel mode?</tt><br>
</span><br>
<tt><span style='font-size:10.0pt'>User mode :)</span></tt> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'><br>
<tt>> For kernel mode, you allocate a mw with ib_alloc_mw(). And you
bind it </tt><br>
<tt>> with ib_bind_mw(). You can invalidate it by posting a
IB_WR_LOCAL_INV </tt><br>
<tt>> work request to the send queue. Then you can do a subsequent
bind. </tt><br>
<tt>> Deallocate with ib_dealloc_mw().</tt><br>
</span><br>
<tt><span style='font-size:10.0pt'>Ok, thanks. I will keep that in mind for
later use (as soon as it is available).</span></tt> <br>
<span style='font-size:10.0pt;font-family:"Courier New"'><br>
<tt>> For user mode, I have a patch series that adds support for MWs, but I </tt><br>
<tt>> hasn't been submitted yet for group review. Its on my (very
long) todo </tt><br>
<tt>> list. :)</tt><br>
</span><br>
<tt><span style='font-size:10.0pt'>No worries, it is not urgent. I was just
wondering how expensive it is to allocate</span></tt> <br>
<tt><span style='font-size:10.0pt'>a memory window as opposed to allocating a
memory region - way cheaper I guess.<span style='color:#1F497D'><o:p></o:p></span></span></tt></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'><br>
<br>
</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><b><i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>[felix] Yes. Note that QP operations are considered ‘fast
path’ (and are fully pipelined in T3) with respect to memory/STag
management they include<o:p></o:p></span></i></b></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><b><i><span style='font-size:11.0pt;font-family:
"Calibri","sans-serif";color:#1F497D'>Fast Register Non Shared MR (priv QP
only)<o:p></o:p></span></i></b></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><b><i><span style='font-size:11.0pt;font-family:
"Calibri","sans-serif";color:#1F497D'>Bind MW<o:p></o:p></span></i></b></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><b><i><span style='font-size:11.0pt;font-family:
"Calibri","sans-serif";color:#1F497D'>Local Invalidate STag<o:p></o:p></span></i></b></p>
<p class=MsoNormal><b><i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></i></b></p>
<p class=MsoNormal><b><i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>You can issue e.g. a Bind MW and then immediately use the MW STag
in e.g. a following RDMA Write. Ordering guarantees that MW is ready by the
time the RDMA Write is executed. <o:p></o:p></span></i></b></p>
<p class=MsoNormal><br>
<tt><span style='font-size:10.0pt'>Thanks,</span></tt> <br>
<tt><span style='font-size:10.0pt'> Philip</span></tt><o:p></o:p></p>
</div>
</div>
</body>
</html>