RPC-over-RDMA Version Two will likely require at least a 4KB inline
threshold by default. The Version One inline threshold is still 1KB,
and it's automatically negotiated down to in
rpcrdma_update_connect_private.
The maximum is somewhat arbitrary. There's no fundamental
architectural limit I'm aware of, but it's good to keep the size of
Receive buffers reasonable. Now that Send can use a s/g list, a
Send buffer is only as large as each RPC requires. Receive buffers
are always the size of the inline threshold, however.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
include/linux/sunrpc/xprtrdma.h | 4 ++--
net/sunrpc/xprtrdma/transport.c | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/include/linux/sunrpc/xprtrdma.h b/include/linux/sunrpc/xprtrdma.h
index 39267dc..221b7a2 100644
--- a/include/linux/sunrpc/xprtrdma.h
+++ b/include/linux/sunrpc/xprtrdma.h
@@ -53,8 +53,8 @@
#define RPCRDMA_MAX_SLOT_TABLE (256U)
#define RPCRDMA_MIN_INLINE (1024) /* min inline thresh */
-#define RPCRDMA_DEF_INLINE (1024) /* default inline thresh */
-#define RPCRDMA_MAX_INLINE (3068) /* max inline thresh */
+#define RPCRDMA_DEF_INLINE (4096) /* default inline thresh */
+#define RPCRDMA_MAX_INLINE (65536) /* max inline thresh */
/* Memory registration strategies, by number.
* This is part of a kernel / user space API. Do not remove. */
diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c
index 6a358ab..ed5e285 100644
--- a/net/sunrpc/xprtrdma/transport.c
+++ b/net/sunrpc/xprtrdma/transport.c
@@ -97,7 +97,7 @@ static struct ctl_table xr_tunables_table[] = {
.data = &xprt_rdma_max_inline_read,
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = proc_dointvec,
+ .proc_handler = proc_dointvec_minmax,
.extra1 = &min_inline_size,
.extra2 = &max_inline_size,
},
@@ -106,7 +106,7 @@ static struct ctl_table xr_tunables_table[] = {
.data = &xprt_rdma_max_inline_write,
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = proc_dointvec,
+ .proc_handler = proc_dointvec_minmax,
.extra1 = &min_inline_size,
.extra2 = &max_inline_size,
},
--
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