From 29c554227aeec48cde5c22f911e51763f096e125 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Mon, 2 May 2016 14:40:48 -0400 Subject: xprtrdma: Bound the inline threshold values 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 Tested-by: Steve Wise Signed-off-by: Anna Schumaker --- include/linux/sunrpc/xprtrdma.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'include/linux/sunrpc') diff --git a/include/linux/sunrpc/xprtrdma.h b/include/linux/sunrpc/xprtrdma.h index 767190b01363..39267dc3486a 100644 --- a/include/linux/sunrpc/xprtrdma.h +++ b/include/linux/sunrpc/xprtrdma.h @@ -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. */ -- cgit v1.2.3