[Openib-windows] [IBAL][Patch] reference counter for IOC obj in IOC PnP manager

[Yossi Leybovich]

> -----Original Message-----
> From: openib-windows-bounces at openib.org 
> [mailto:openib-windows-bounces at openib.org] On Behalf Of Fabian Tillier
> Sent: Wednesday, November 22, 2006 9:20 AM
> To: Yossi Leybovich
> Cc: openib-windows at openib.org
> Subject: Re: [Openib-windows] [IBAL][Patch] reference counter 
> for IOC obj in IOC PnP manager
> 
> Hi Yossi,
> 
> On 11/17/06, Yossi Leybovich <sleybo at mellanox.co.il> wrote:
> >
> > 2. When connecting SRP target to 2 HCA on the same host.
> > The PnP events use the IOC GUID as key to insert/remove from the 
> > context_map.
> > In case we use the same SRP target with the 2 HCAs they 
> both have same 
> > key.
> >
> > I change the context_map to use 128 bit key ( and not 64bit 
> key) The 
> > key is construct from IOC GUID and CA GUID This change 
> effect also the 
> > port events and the CA events.
> 
> Using the CA GUID to store the distinct IOU/IOC objects in 
> the IOC PnP manager's tables is fine.  However, using 
> different unique IDs for the devices when reporting them to 
> the system is not - it is a single device.  The location 
> information is different, but it is the same device.  Thus, I 
> think the unique ID for the IOC should still be the IOC GUID 
> alone, and not concatenated with the CA GUID.
> 

Windows refuse to create 2 SRP devices with the same unique ID , at
least that what I get when trying to do so.
You can see that the IOU device use 128 bits of unique ID (I just copy
the code from the IOU unique ID) although it's the same IOU node in the
both HCAs.
We can change that (and we discuss that in the past ) but right now we
create IOU device as the HCA son and the IOC is the son of the IOU .
So the ibiou (of each HCA ) try to create SRP with the same unique ID.
If we will create the IOC in the systems level (without IOU device ) we
can create only one IOC for all HCA that connect to the same target.
This will also require some changes in the SRP driver to add it ability
to switch from HCA to HCA and it will save the needs for MPIO DDK driver

What do you think ?

> When you plug in a USB device into multiple ports on your 
> computer, does that hub show up multiple times in the device 
> manager?  Does it have different unique IDs?
> 

I don't know about USB but, I got an error when trying to use the IOC
guid as unique ID ( and see also the IOU unique ID which is 128 bits)


> - Fab
> 
> _______________________________________________
> openib-windows mailing list
> openib-windows at openib.org
> http://openib.org/mailman/listinfo/openib-windows
>