[PATCH v2 0/8] Fix various races in xprtrdma

[Chuck Lever <cel@kernel.org>]

From: Chuck Lever <chuck.lever@oracle.com>

Since commit b326df4a8ec6 ("NFS: enable nconnect for RDMA"), the
nconnect mount option has been enabled on proto=rdma NFS mount
points. Utilizing this option increases the IOPS throughput that
an NFS mount point is capable of.

To test some ongoing NFS server performance scalability work, I've
started to enable nconnect while testing. I've found that, as well
as enabling much better utilization of fast network fabrics, it
surfaces some subtle race conditions that are well-buried when there
is only a single QP.

This series addresses a few bugs and makes some performance
scalability enhancements to make nconnect with NFS/RDMA even better.

---

Changes since v1:
- Expand single-patch series with more fixes

Chuck Lever (7):
  xprtrdma: Close sendctx get/put race that can block a transport
  xprtrdma: Avoid 250 ms delay on backlog wakeup
  xprtrdma: Close lost-wakeup race in xprt_rdma_alloc_slot
  xprtrdma: Decouple frwr_wp_create from frwr_map
  xprtrdma: Replace rpcrdma_mr_seg with xdr_buf cursor
  xprtrdma: Scale receive batch size with credit window
  xprtrdma: Post receive buffers after RPC completion

Eric Badger (1):
  xprtrdma: Decrement re_receiving on the early exit paths

 include/linux/sunrpc/xprt.h     |   2 +
 include/trace/events/rpcrdma.h  |  28 ++---
 net/sunrpc/xprt.c               |  16 +++
 net/sunrpc/xprtrdma/frwr_ops.c  | 176 ++++++++++++++++++++++++++------
 net/sunrpc/xprtrdma/rpc_rdma.c  | 174 ++++++++++++-------------------
 net/sunrpc/xprtrdma/transport.c |  17 ++-
 net/sunrpc/xprtrdma/verbs.c     |  26 ++++-
 net/sunrpc/xprtrdma/xprt_rdma.h |  43 +++++---
 8 files changed, 305 insertions(+), 177 deletions(-)

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2.53.0