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

[Ishai Rabinovitz]

Roland Dreier wrote:
> 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.


This is also Vu's idea.

There are two issues:

1) My patch allows a sophisticated user to have two logical connections on
the same physical solution. He can have different connection parameters
(e.g., MAX_CMD_PER_LUN) according to the application needs.
 Do you think there is such need?

2) In the current implementation there is a problem when there are two
connections on the same physical connection - when the second connection
sends REQ to the target, the target sends a DREQ to the first connection,
but when someone tries to access the first scsi_host, ib_srp tries to
reconnect the first connection and then the second connection gets a DREQ
- and so the ping pong goes.
And if there is a multipath daemon that checks the status of the
connections this ping pong can be for ever.
We need to find a way to eliminate this behavior.

Ishai