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<title>RE: [openib-general] Some Missing Features from mthca/user MAD access</title>
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<div class=Section1 dir=RTL>
<p class=MsoNormal dir=LTR><b><font size=3 color="#003300"
face="Palatino Linotype"><span style='font-size:12.0pt;font-family:"Palatino Linotype";
color:#003300;font-weight:bold'>I'm sorry if I did not explain myself
very well.<o:p></o:p></span></font></b></p>
<p class=MsoNormal dir=LTR><b><font size=3 color="#003300"
face="Palatino Linotype"><span style='font-size:12.0pt;font-family:"Palatino Linotype";
color:#003300;font-weight:bold'>I did not mean to say another application will
respond to <span class=SpellE>SMInfo</span>.<o:p></o:p></span></font></b></p>
<p class=MsoNormal dir=LTR><b><font size=3 color="#003300"
face="Palatino Linotype"><span style='font-size:12.0pt;font-family:"Palatino Linotype";
color:#003300;font-weight:bold'>Nor I claimed that <span class=SpellE>SMInfo</span>
should be used for anything else but SM to SM discovery.<o:p></o:p></span></font></b></p>
<p class=MsoNormal dir=LTR><b><font size=3 color="#003300"
face="Palatino Linotype"><span style='font-size:12.0pt;font-family:"Palatino Linotype";
color:#003300;font-weight:bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal dir=LTR><b><font size=3 color="#003300"
face="Palatino Linotype"><span style='font-size:12.0pt;font-family:"Palatino Linotype";
color:#003300;font-weight:bold'>I only referred to the idea that one can set
the SM bit by inspecting the mask of registrations to mad filtering requests.<o:p></o:p></span></font></b></p>
<p class=MsoNormal dir=LTR><b><font size=3 color="#003300"
face="Palatino Linotype"><span style='font-size:12.0pt;font-family:"Palatino Linotype";
color:#003300;font-weight:bold'>I assume that one can register by supplying a
mask. Now - you probably do not have any control over the mask an
arbitrary application might use. So depending on it not to set the <span
class=SpellE>SMInfo</span> bit (even though it will not process <span
class=GramE>the <span class=SpellE>mads</span></span>) is too risky in my mind.<o:p></o:p></span></font></b></p>
<p class=MsoNormal dir=LTR><b><font size=3 color="#003300"
face="Palatino Linotype"><span style='font-size:12.0pt;font-family:"Palatino Linotype";
color:#003300;font-weight:bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal dir=LTR><b><font size=3 color="#003300"
face="Palatino Linotype"><span style='font-size:12.0pt;font-family:"Palatino Linotype";
color:#003300;font-weight:bold'>However, from your response it seems like only one
client is allowed to register as the receiver for incoming requests of specific
attribute. Is this correct? If this is the case then a careless application can
block the SM from obtaining any <span class=SpellE>SMInfo</span> or other
queries. <o:p></o:p></span></font></b></p>
<p class=MsoNormal dir=LTR><b><font size=3 color="#003300"
face="Palatino Linotype"><span style='font-size:12.0pt;font-family:"Palatino Linotype";
color:#003300;font-weight:bold'><o:p> </o:p></span></font></b></p>
<div>
<p class=MsoNormal dir=LTR style='mso-layout-grid-align:none;text-autospace:
none'><st1:PersonName><b><i><font size=5 color=blue face="Monotype Corsiva"><span
lang=EN-GB style='font-size:20.0pt;font-family:"Monotype Corsiva";mso-bidi-font-family:
"Monotype Corsiva";color:blue;mso-ansi-language:EN-GB;font-weight:bold;
font-style:italic;mso-no-proof:yes'>Eitan Zahavi</span></font></i></b></st1:PersonName><font
size=1 color="#003300" face=Tahoma><span lang=EN-GB style='font-size:8.5pt;
font-family:Tahoma;color:#003300;mso-ansi-language:EN-GB;mso-no-proof:yes'><o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='mso-layout-grid-align:none;text-autospace:
none'><font size=1 color="#003300" face=Tahoma><span lang=EN-GB
style='font-size:8.5pt;font-family:Tahoma;color:#003300;mso-ansi-language:EN-GB;
mso-no-proof:yes'>Design Technology Director<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='mso-layout-grid-align:none;text-autospace:
none'><font size=1 color="#003300" face=Tahoma><span lang=EN-GB
style='font-size:8.5pt;font-family:Tahoma;color:#003300;mso-ansi-language:EN-GB;
mso-no-proof:yes'>Mellanox Technologies LTD<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='mso-layout-grid-align:none;text-autospace:
none'><font size=1 color="#003300" face=Tahoma><span lang=EN-GB
style='font-size:8.5pt;font-family:Tahoma;color:#003300;mso-ansi-language:EN-GB;
mso-no-proof:yes'>Tel:+972-4-9097208<br>
Fax:+972-4-9593245<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='mso-layout-grid-align:none;text-autospace:
none'><font size=1 color="#003300" face=Tahoma><span lang=EN-GB
style='font-size:8.5pt;font-family:Tahoma;color:#003300;mso-ansi-language:EN-GB;
mso-no-proof:yes'>P.O. Box 586 Yokneam 20692 ISRAEL<o:p></o:p></span></font></p>
</div>
<p class=MsoNormal dir=LTR><b><font size=3 color="#003300"
face="Palatino Linotype"><span style='font-size:12.0pt;font-family:"Palatino Linotype";
color:#003300;font-weight:bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal dir=LTR style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> shaharf
[mailto:shaharf@voltaire.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, January 10, 2005
6:56 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Eitan Zahavi; Michael S.
Tsirkin; Roland Dreier<br>
<b><span style='font-weight:bold'>Cc:</span></b> openib-general@openib.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [openib-general] Some
Missing Features from mthca/user MAD access</span></font></p>
<p class=MsoNormal dir=LTR style='margin-left:.5in'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal dir=LTR style='margin-left:.5in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Eitan,
the main (and only) purpose of the IS_SM bit is for SM to SM coordination. As a
matter of fact it means that when discavering a port with this bit you have to
query it with sminfo to see if he is the master or maybe it should be the
master. There is not other use. Having an application other then the SM respond
to the sminfo would not work in the current scheme. As a matter of fact
it maybe catastrophic - meaning it may lead to multiple masters SM in the
subnet!!! <o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='margin-left:.5in'><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 dir=LTR style='margin-left:.5in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>I really
don't understand what resources you refer to. I think I know the OpenSM
pretty well but maybe I have new things to learn. Please enlighten me.<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='margin-left:.5in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Ref-counting
too is useless. There should be only one SM on the port. I see not reason to
change that.<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='margin-left:.5in'><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 dir=LTR style='margin-left:.5in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Shahar<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='margin-left:.5in'><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>
<div style='border-top:none;border-left:none windowtext 1.0pt;border-bottom:
none;border-right:solid blue 1.5pt;mso-border-left-alt:none windowtext 0in;
mso-border-right-alt:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'>
<div>
<div class=MsoNormal align=center dir=LTR style='margin-left:.5in;text-align:
center'><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center>
</span></font></div>
<p class=MsoNormal dir=LTR style='margin-left:.5in'><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'> Eitan
Zahavi [mailto:eitan@mellanox.co.il] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, January 10, 2005
6:43 PM<br>
<b><span style='font-weight:bold'>To:</span></b> shaharf; Eitan Zahavi; Michael
S. Tsirkin; Roland Dreier<br>
<b><span style='font-weight:bold'>Cc:</span></b> openib-general@openib.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [openib-general] Some
Missing Features from mthca/user MAD access</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal dir=LTR style='margin-left:.5in'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p dir=LTR style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Shahar> Yes, but when
you want to respond to attributes you have to specify a mask. Using that mask
you can register to any attribute set you want.<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='margin-left:.5in'><b><font size=3
color="#993366" face="Palatino Linotype"><span style='font-size:12.0pt;
font-family:"Palatino Linotype";color:#993366;font-weight:bold'>Yes, but if the
application (that is not an SM) will use a mask that has the sminfo set - it
will be considered an SM.<o:p></o:p></span></font></b></p>
<p class=MsoNormal dir=LTR style='margin-left:.5in'><b><font size=3
color="#993366" face="Palatino Linotype"><span style='font-size:12.0pt;
font-family:"Palatino Linotype";color:#993366;font-weight:bold'>I would prefer
having the SMBit stay on when the SM dies then having spurious SMBit
transitions.<o:p></o:p></span></font></b></p>
<p class=MsoNormal dir=LTR style='margin-left:.5in'><b><font size=3
color="#993366" face="Palatino Linotype"><span style='font-size:12.0pt;
font-family:"Palatino Linotype";color:#993366;font-weight:bold'>It will take
more resources from the SM when these bits will start to change.<o:p></o:p></span></font></b></p>
<p class=MsoNormal dir=LTR style='margin-left:.5in'><b><font size=3
color="#993366" face="Palatino Linotype"><span style='font-size:12.0pt;
font-family:"Palatino Linotype";color:#993366;font-weight:bold'>Also you will
need to start ref-counting on the port since several apps can share it and they
will not obey the rule for not masking the sminfo if they are not SMs.<o:p></o:p></span></font></b></p>
<p class=MsoNormal dir=LTR style='margin-left:.5in'><b><font size=3
color="#993366" face="Palatino Linotype"><span style='font-size:12.0pt;
font-family:"Palatino Linotype";color:#993366;font-weight:bold'><o:p> </o:p></span></font></b></p>
<div>
<p class=MsoNormal dir=LTR style='margin-left:.5in;text-autospace:none'><b><i><font
size=5 color=blue face="Monotype Corsiva"><span lang=EN-GB style='font-size:
20.0pt;font-family:"Monotype Corsiva";color:blue;mso-ansi-language:EN-GB;
font-weight:bold;font-style:italic'>Eitan Zahavi</span></font></i></b><font
size=1 color="#993366" face=Tahoma><span lang=EN-GB style='font-size:8.5pt;
font-family:Tahoma;color:#993366;mso-ansi-language:EN-GB'><o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='margin-left:.5in;text-autospace:none'><font
size=1 color="#993366" face=Tahoma><span lang=EN-GB style='font-size:8.5pt;
font-family:Tahoma;color:#993366;mso-ansi-language:EN-GB'>Design Technology
Director<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='margin-left:.5in;text-autospace:none'><font
size=1 color="#993366" face=Tahoma><span lang=EN-GB style='font-size:8.5pt;
font-family:Tahoma;color:#993366;mso-ansi-language:EN-GB'>Mellanox Technologies
LTD<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='margin-left:.5in;text-autospace:none'><font
size=1 color="#993366" face=Tahoma><span lang=EN-GB style='font-size:8.5pt;
font-family:Tahoma;color:#993366;mso-ansi-language:EN-GB'>Tel:+972-4-9097208<br>
Fax:+972-4-9593245<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='margin-left:.5in;text-autospace:none'><st1:address
st="on"><font size=1 color="#993366" face=Tahoma><span lang=EN-GB
style='font-size:8.5pt;font-family:Tahoma;color:#993366;mso-ansi-language:
EN-GB'>P.O. Box 586 Yokneam 20692 </span></font><st1:country-region st="on"><font
size=1 color="#993366" face=Tahoma><span lang=EN-GB style='font-size:8.5pt;
font-family:Tahoma;color:#993366;mso-ansi-language:EN-GB'>ISRAEL</span></font></st1:country-region></st1:address><font
size=1 color="#993366" face=Tahoma><span lang=EN-GB style='font-size:8.5pt;
font-family:Tahoma;color:#993366;mso-ansi-language:EN-GB'><o:p></o:p></span></font></p>
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