xprtrdma: Allocate RPC/RDMA send buffer separately from struct rpcrdma_req

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The rl_base field is currently the buffer where each RPC/RDMA call
header is built.

The inline threshold is an agreed-on size limit to for RDMA SEND
operations that pass between client and server. The sum of the
RPC/RDMA header size and the RPC header size must be less than or
equal to this threshold.

Increasing the r/wsize maximum will require MAX_SEGS to grow
significantly, but the inline threshold size won't change (both
sides agree on it). The server's inline threshold doesn't change.

Since an RPC/RDMA header can never be larger than the inline
threshold, make all RPC/RDMA header buffers the size of the
inline threshold.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

...

This commit is contained in:

Chuck Lever 2015-01-21 11:04:16 -05:00 • committed by Anna Schumaker

parent 0ca77dc372

commit 85275c874e

4 changed files with 19 additions and 29 deletions

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11

net/sunrpc/xprtrdma/rpc_rdma.c

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9

net/sunrpc/xprtrdma/transport.c

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22

net/sunrpc/xprtrdma/verbs.c

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6

net/sunrpc/xprtrdma/xprt_rdma.h

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