[ofa-general] RE: [PATCH 0/8 v3] RDMAoE support

[Liran Liss]

S.B.
--Liran

In short: no (big hole) and no (all apps will run to use it). In more
details, if its a big hole, how come almost no one asked for it? next,
many (most, maybe all) of the MPI people claim that their biggest/sole
problem with the rdma-cm is the non scalability of the SA being their
bottleneck (personally, I am not convinced the SA is the bottleneck) and
as such they are not going in that direction. So we are still remain
with SRP, does Mellanox see SRP deployments running over rdmaoe?

LL: we keep getting questions from customers using native IB regarding a
sensible way to do path queries and multicast joins from user-space.
The only answer I can currently give them is to use rdmacm.
That said, you are probably correct that most IB apps (in general) will
use rdmacm.
Regarding SRP, it is definitely a possibility.

so this path-set doesn't play with e.g RDS using IPv4 addresses? I
understood it does, so please clarify.

LL: RDS uses the CMA, which supports IPv4.
The current rdmaoe CMA code uses IPv6 link-local addresses as GIDs; once
we add IPv4 support, the CMA will encapsulate the given IP address in
the GID.