<br><font size=2 face="sans-serif">Hi Hal,</font>
<br>
<br><font size=2 face="sans-serif">Can opensm just run once? When the subnet
is up, it can exit assume that no change will be made in the subnet.</font>
<br>
<br><font size=2 face="sans-serif">Thanks!</font>
<br><font size=2 face="sans-serif">Yicheng</font>
<br>
<br>
<br>
<br>
<table width=100%>
<tr valign=top>
<td width=40%><font size=1 face="sans-serif"><b>"Hal Rosenstock"
<hal.rosenstock@gmail.com></b> </font>
<p><font size=1 face="sans-serif">07/10/2008 09:15 PM</font>
<td width=59%>
<table width=100%>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif">"Yicheng Jia" <YJia@tmriusa.com></font>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">cc</font></div>
<td><font size=1 face="sans-serif">"Jim Mott" <jim@mellanox.com>,
general@lists.openfabrics.org</font>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">Re: [ofa-general] minimum sw components
requirement for driver/opensm in a single unmanaged switch network</font></table>
<br>
<table>
<tr valign=top>
<td>
<td></table>
<br></table>
<br>
<br>
<br><tt><font size=2>On Thu, Jul 10, 2008 at 7:39 PM, Yicheng Jia <YJia@tmriusa.com>
wrote:<br>
><br>
>> If you want to avoid all the SM stuff, and are willing to program
the<br>
>> switches directly (a few mads)<br>
><br>
> Is it done by opensm?<br>
<br>
Yes.<br>
<br>
> What information should be set up in the switch by<br>
> opensm?<br>
<br>
Things like the PortInfos and LFT. See IBA spec vol 1 14.2.5<br>
<br>
>> Then to figure out QP connections, you just use a function of
3<br>
>> parameters:<br>
>> my_qp_num = fn_sqp(my_node, target_node, qp_num)<br>
>> target_qp_num = fn_tqp(my_node, target_node, qp_num)<br>
>> Where qp_num is a small number between 0 and the maximum number
of QPs you<br>
>> need active between any 2 endpoints.<br>
><br>
> Can the qp_num be manually assigned?<br>
> Does it need opensm be involved?<br>
<br>
SM has nothing to do with QP numbers.<br>
<br>
>> If it works, you are done. If not, reset, up, wait for him
to connect and<br>
>> send something to you.<br>
><br>
> Is it reliable? I mean the QPs connection will keep alive during the
QPs<br>
> lifecycle?<br>
<br>
For one thing, SM needs to try to keep ports at active.<br>
<br>
-- Hal<br>
<br>
> Best,<br>
> Yicheng<br>
><br>
><br>
><br>
> "Jim Mott" <jim@mellanox.com><br>
><br>
> 07/10/2008 04:17 PM<br>
><br>
> To<br>
> "Yicheng Jia" <YJia@tmriusa.com>, <general@lists.openfabrics.org><br>
> cc<br>
> Subject<br>
> RE: [ofa-general] minimum sw components requirement for driver/opensm
in a<br>
> single unmanaged switch network<br>
><br>
><br>
><br>
><br>
> If you want to avoid all the SM stuff, and are willing to program
the<br>
> switches directly (a few mads), then I've used schemes like:<br>
><br>
> Node LID=base + (switch port * constant) (base=0, constant = 1 works)<br>
><br>
> Then to figure out QP connections, you just use a function of 3 parameters:<br>
> my_qp_num = fn_sqp(my_node, target_node, qp_num)<br>
> target_qp_num = fn_tqp(my_node, target_node, qp_num)<br>
> Where qp_num is a small number between 0 and the maximum number of
QPs you<br>
> need active between any 2 endpoints.<br>
><br>
> With the above scheme, you know your node_id (switch port number),
your lid,<br>
> the lid of the target node, and the QPs on both sides. From
there on, it<br>
> is clear sailing. You don't even need to send MADs; just transition
the QP<br>
> up and try and use it. If it works, you are done. If not,
reset, up, wait<br>
> for him to connect and send something to you. A little timer
to make sure<br>
> everybody retries once in awhile and what can go wrong?<br>
><br>
> Jim<br>
> From: general-bounces@lists.openfabrics.org<br>
> [mailto:general-bounces@lists.openfabrics.org] On Behalf Of Yicheng
Jia<br>
> Sent: Thursday, July 10, 2008 2:59 PM<br>
> To: general@lists.openfabrics.org<br>
> Subject: [ofa-general] minimum sw components requirement for driver/opensm<br>
> in a single unmanaged switch network<br>
><br>
><br>
> Hi Folks,<br>
><br>
> I have a IB network which consists of only a single unmanaged switch,
all<br>
> end nodes connecting with the switch only need to do RDMA read/write<br>
> operation with each other. My question is, what are the indispensable<br>
> modules in driver's core and opensm that make the network up and run?<br>
><br>
> I've been using only ib_mad module in driver's core with a managed
switch<br>
> before, and the network works fine. So I assume that only the ib_mad
module<br>
> in driver's core and SM in opensm are mandatory in my network. The
LIDs are<br>
> assigned by them. The SA and CM modules are not useful in my case.
Am I<br>
> right?<br>
><br>
> I need to minimize driver and opensm to fit them in my network, the
HCA<br>
> driver is mthca.<br>
><br>
> Best,<br>
> Yicheng<br>
> _____________________________________________________________________________<br>
> Scanned by IBM Email Security Management Services powered by MessageLabs.<br>
> For more information please visit </font></tt><a href=http://www.ers.ibm.com/><tt><font size=2>http://www.ers.ibm.com<br>
> _____________________________________________________________________________<br>
><br>
> _____________________________________________________________________________<br>
> Scanned by IBM Email Security Management Services powered by MessageLabs.<br>
> For more information please visit </font></tt><a href=http://www.ers.ibm.com/><tt><font size=2>http://www.ers.ibm.com<br>
> _____________________________________________________________________________<br>
><br>
> _____________________________________________________________________________<br>
> Scanned by IBM Email Security Management Services powered by MessageLabs.<br>
> For more information please visit </font></tt><a href=http://www.ers.ibm.com/><tt><font size=2>http://www.ers.ibm.com<br>
> _____________________________________________________________________________<br>
><br>
> _______________________________________________<br>
> general mailing list<br>
> general@lists.openfabrics.org<br>
> </font></tt><a href="http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general"><tt><font size=2>http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general<br>
><br>
> To unsubscribe, please visit<br>
> </font></tt><a href="http://openib.org/mailman/listinfo/openib-general"><tt><font size=2>http://openib.org/mailman/listinfo/openib-general<br>
><br>
<br>
_____________________________________________________________________________<br>
Scanned by IBM Email Security Management Services powered by MessageLabs.
For more information please visit </font></tt><a href=http://www.ers.ibm.com/><tt><font size=2>http://www.ers.ibm.com<br>
_____________________________________________________________________________<br>
</font></tt></a></a></a></a></a></a>
<br>
<BR>
_____________________________________________________________________________<BR>
Scanned by IBM Email Security Management Services powered by MessageLabs. For more information please visit http://www.ers.ibm.com<BR>
_____________________________________________________________________________<BR>