[ofw] Expose a vendor defined device in ibbus?

[Fab Tillier]

> On Wed, Dec 17, 2008 at 4:11 AM, Leonid Keller <leonid at mellanox.co.il>
> wrote:
>>> How does IOU device get notification and thus create PDO?
>> IBAL requests SA whether there are IOU devices registered.
>
> Which SA requests are used for this or do you mean device manager ?

The IOC PnP manager in IBAL does a bulk query for all node records and another for all path records.  From there it does a join of the two to create a list of nodes and the paths to them, by port GUID.  It then collapses this list to represent IOUs by node GUID (to handle multi-port IOUs as a single entity).  Then it issues an IO_UNIT_INFO query to each potential IOU, and prunes from the list those that have max_controllers == 0.  For every IOU that has a non-zero max_controllers value, it queries the IOU for IOC profiles, and builds a list of IOCs from the response.  Then for each IOC it queries service entries.

Once this is done, it merges the newly built tree of IOU/IOC/Paths with the existing one and reports changes to registered clients (IOU add/remove, IOC add/remove, IOC add/remove path

Now if the SA had a query that a client could issue to return all nodes that have device management enabled that would help reduce the query load.

-Fab