Kanevsky, Arkady wrote:
CM passes IB addresses of both src and dest in REQ.
How locally dest IP address is mapped to dest IB GID|LID is
defined by IPoIB.
We can request IBTA to define it also.
But the goal is to define a protocol part in IBTA.
The mapping from an IP address to a GID is controlled by a system administrator.
ARP can be used to resolve the IP address to the GID, but there still needs to
be a way to map the TCP port number to a service ID, which goes across the wire,
and needs to be defined. Right now, the service ID is the only indicator that a
CM or other recipient has that the private data has a particular format.
An alternative is to grab a reserved bit from the CM REQ to indicate that this
header is present, and ignore the service ID in such cases (provided the
destination TCP/IP address is given in the private data).
You are correct that if rely on CM storing the IP address of the dest
it is not needed to be passed back in REP.
If we do not need to know that response came from a different IP
address.
Or a different port.
Why would you want to establish a connection using an address that's different
from that specified by the requester?
- Sean
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