Michael S. Tsirkin wrote:
Sean, I am seeing the following problem: I have a dual-port HCA
with IPoIB interfaces ib0 on port 1 and ib1 on port 2.
port 1 is down and port 2 is up,
and I try creating a connection to the loopback address 127.0.0.1.
The problem I am seeing is that I am getting RDMA_CM_EVENT_ROUTE_ERROR.
Apparently CMA attempts address resolution through port 1, which fails.
To be clear, loopback addresses are handled separately and do not perform
address resolution. But they do use port 1 of the first local device in the
CMA's device list.
The problem is that path record lookup fails.
Checking for a port that's active in cma_bind_loopback() seems like a reasonable
approach for now. Is it possible to communicate between QPs on the same
device if that device is disconnected from the fabric?
- Sean
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