I've received a number of reports that v4.9 commit 655fec6987be
("xprtrdma: Use gathered Send for large inline messages") causes
NFS/RDMA mounts to fail for devices that have a small max_sge.
This series addresses that problem.
A much smaller fix was provided initially. It worked for devices
with as small as five send SGEs. However, additional research has
shown that there is at least one in-tree device that supports only
three send SGEs.
The current series should enable NFS/RDMA again on those devices.
Available in the "nfs-rdma-for-4.10-rc" topic branch of this git repo:
git://git.linux-nfs.org/projects/cel/cel-2.6.git
And for online review:
http://git.linux-nfs.org/?p=cel/cel-2.6.git;a=shortlog;h=refs/heads/nfs-rdma-for-4.10-rc
---
Chuck Lever (5):
xprtrdma: Fix Read chunk padding
xprtrdma: Per-connection pad optimization
xprtrdma: Disable pad optimization by default
xprtrdma: Reduce required number of send SGEs
xprtrdma: Shrink send SGEs array
net/sunrpc/xprtrdma/rpc_rdma.c | 59 ++++++++++++++++++++++++++-------------
net/sunrpc/xprtrdma/transport.c | 2 +
net/sunrpc/xprtrdma/verbs.c | 15 ++++++----
net/sunrpc/xprtrdma/xprt_rdma.h | 13 ++++++---
4 files changed, 58 insertions(+), 31 deletions(-)
--
Chuck Lever
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