Open iscsi expects the transport to support the following chain:
+1 create socket
+2 connect the socket to the target
+3 bind the socket to an iscsi connection enabling actual
communication over this iscsi connection
so, we implemented the minimal set of operations (ie socket/connect)
which will enable open iscsi to work transparently with the
iser transport.
Or.
As indicated in my other reply, this is not consistent
with how iWARP connections are being done. The CMA
infrastructure, with IP semantics for IB addressing,
should be built upon here. There is no reason why
iSER connections should follow different logic than
RDMA connections.
This one is from your other reply:
There really isn't a lot of user-space logic being preserved
here unless you keep the negotiations in user-space as well.
The point is that open-iscsi *keeps* all negotiations in user-space.
As far as i understand, it's not going to change because the separation of
control and data paths is one of the basic design principles of the project.
And iSER/IB connections do differ from other types.
Again, citing your other reply:
Using iscsi_tcp the "startup phase" messages would simply
be translated into writes/reads over a TCP socket. For
iSER/IB they would be translated to Send Messages. For
iSER/IP they could be translated into TCP segments.
The differences that you mentioned correspond to 3 ways that various
transports (iscsi/ip, iser/ib, iser/ip) would handle the reads/writes.
This presents no problem, because there would be 3 different transport
modules,
each one acting appropriately in response to the "messages".
The only problem that remains is connection establishment.
Because the differences there are just as pronounced, and the connections
are initiated from user space using a socket, we don't have another
solution which looks cleaner.
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