Commit d2310930 authored Aug 03, 2015 by Chuck Lever Committed by Anna Schumaker Aug 05, 2015

xprtrdma: Don't fall back to PHYSICAL memory registration



PHYSICAL memory registration uses a single rkey for all of the
client's memory, thus is insecure. It is still useful in some cases
for testing.

Retain the ability to select PHYSICAL memory registration capability
via /proc/sys/sunrpc/rdma_memreg_strategy, but don't fall back to it
if the HCA does not support FRWR or FMR.

This means amso1100 no longer works out of the box with NFS/RDMA.
When using amso1100 HCAs, set the memreg_strategy sysctl to 6 before
performing NFS/RDMA mounts.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Devesh Sharma <devesh.sharma@avagotech.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

parent 061dff29

net/sunrpc/xprtrdma/verbs.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -539,7 +539,7 @@ rpcrdma_ia_open(struct rpcrdma_xprt xprt, struct sockaddr addr, int memreg)
		if (!ia->ri_device->alloc_fmr) {
		dprintk("RPC: %s: MTHCAFMR registration "
		"not supported by HCA\n", __func__);
		memreg = RPCRDMA_ALLPHYSICAL;
		goto out3;
		}
		}