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xprtrdma: Bound the inline threshold values

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Currently the sysctls that allow setting the inline threshold allow
any value to be set.

Small values only make the transport run slower. The default 1KB
setting is as low as is reasonable. And the logic that decides how
to divide a Send buffer between RPC-over-RDMA header and RPC message
assumes (but does not check) that the lower bound is not crazy (say,
57 bytes).

Send and receive buffers share a page with some control information.
Values larger than about 3KB can't be supported, currently.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever
2016-05-02 14:40:48 -04:00
committed by Anna Schumaker
parent 6b26cc8c8e
commit 29c554227a
2 changed files with 9 additions and 1 deletions
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4
include/linux/sunrpc/xprtrdma.h
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@@ -52,7 +52,9 @@
#define RPCRDMA_DEF_SLOT_TABLE (128U)
#define RPCRDMA_MAX_SLOT_TABLE (256U)
#define RPCRDMA_DEF_INLINE (1024) /* default inline max */
#define RPCRDMA_MIN_INLINE (1024) /* min inline thresh */
#define RPCRDMA_DEF_INLINE (1024) /* default inline thresh */
#define RPCRDMA_MAX_INLINE (3068) /* max inline thresh */
/* Memory registration strategies, by number.
* This is part of a kernel / user space API. Do not remove. */