Michael S. Tsirkin wrote:
I think that the CM flow control parameter affects the requestor. This option is for responder.
The CM flow control parameter indicates if the local HCA implements flow control or always advertises invalid credits. It's carried in both the REQ and REP messages, so we end up knowing the value used by both sides. (See 12.7.26)
The only way I can find for consumers to make use of this value is for them to change their algorithms based on whether flow control is supported or not. But it's not clear to me how the consumer determines what value to set flow control to.
I think that we need to relate anything that we do with flow control in with the value exchanged as part of the IB CM protocol. (This value is also exposed through the RDMA CM as well.) From an architectural view, this may require changing the meaning of the value carried in the IB CM messages from 'signifying whether the local CA actually implements flow control', to 'signifying whether the local QP will implement flow control'.
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