xprtrdma: Client-side support for rpcrdma_connect_private
authorChuck Lever <chuck.lever@oracle.com>
Thu, 15 Sep 2016 14:57:07 +0000 (10:57 -0400)
committerAnna Schumaker <Anna.Schumaker@Netapp.com>
Mon, 19 Sep 2016 17:08:38 +0000 (13:08 -0400)
commit87cfb9a0c85ce4a0c96a4f3d692a85519b933ade
tree7e9f35448effa32a7e0b20a86b6c4aa1211315b7
parentff06bd191e722393d9abf7d6f9767f195274e909
xprtrdma: Client-side support for rpcrdma_connect_private

Send an RDMA-CM private message on connect, and look for one during
a connection-established event.

Both sides can communicate their various implementation limits.
Implementations that don't support this sideband protocol ignore it.

Once the client knows the server's inline threshold maxima, it can
adjust the use of Reply chunks, and eliminate most use of Position
Zero Read chunks. Moderately-sized I/O can be done using a pure
inline RDMA Send instead of RDMA operations that require memory
registration.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
include/linux/sunrpc/rpc_rdma.h
net/sunrpc/xprtrdma/fmr_ops.c
net/sunrpc/xprtrdma/frwr_ops.c
net/sunrpc/xprtrdma/rpc_rdma.c
net/sunrpc/xprtrdma/verbs.c
net/sunrpc/xprtrdma/xprt_rdma.h