[openib-general] [PATCH] IB/SRP: Enable multichannel

[Lakshmanan, Madhu]

Quoting r.  Vu Pham [vuhuong at mellanox.com]:
> Subject: Re: [PATCH] IB/SRP: Enable multichannel
> What is the advantage to have multiple connections/qps on the same
>physical port to the same target? The disavantages are wasting
resources, >instability, no fail-over on physical port error...

The advantage is if the target in question is an IOC that connects to a
FC SAN for example. In this case, the host is physically connected to
the same IOC, but can maintain independent logical connections to
specific storage devices on the SAN that are "behind" the IOC.

Quoting r. Michael S. Tsirkin <mst at mellanox.co.il>
>> Subject: Re: [PATCH] IB/SRP: Enable multichannel
>> 
>> Maybe we should just use the port GUID instead of the node GUID to
>> form the initiator ID?  That would solve this pretty cleanly I think.

> Sounds good.
> I think we should also stick the pkey into the identifier extension -
> I think it's nice for each partition to be able to act as a separate
>virtual network, not affecting others.

> What do you think?
> -- 
> MST

Sticking the pkey into the identifier extension may once again restrict
the ability of the host to have multiple logical connections to an SRP
IOC target. 

The most flexible approach appears to be:
Identifier ID = Port GUID
Identifier Extension = User specified 

Ishai's IB-SRP patch of 09/27 appears to accomplish the above.

Madhu


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