linux-toradex.git/include/linux/sunrpc/svc_rdma.h, branch v4.1

Merge branch 'for-3.20' of git://linux-nfs.org/~bfields/linux

2015-02-12T18:39:41+00:00

Pull nfsd updates from Bruce Fields:
 "The main change is the pNFS block server support from Christoph, which
  allows an NFS client connected to shared disk to do block IO to the
  shared disk in place of NFS reads and writes.  This also requires xfs
  patches, which should arrive soon through the xfs tree, barring
  unexpected problems.  Support for other filesystems is also possible
  if there's interest.

  Thanks also to Chuck Lever for continuing work to get NFS/RDMA into
  shape"

* 'for-3.20' of git://linux-nfs.org/~bfields/linux: (32 commits)
  nfsd: default NFSv4.2 to on
  nfsd: pNFS block layout driver
  exportfs: add methods for block layout exports
  nfsd: add trace events
  nfsd: update documentation for pNFS support
  nfsd: implement pNFS layout recalls
  nfsd: implement pNFS operations
  nfsd: make find_any_file available outside nfs4state.c
  nfsd: make find/get/put file available outside nfs4state.c
  nfsd: make lookup/alloc/unhash_stid available outside nfs4state.c
  nfsd: add fh_fsid_match helper
  nfsd: move nfsd_fh_match to nfsfh.h
  fs: add FL_LAYOUT lease type
  fs: track fl_owner for leases
  nfs: add LAYOUT_TYPE_MAX enum value
  nfsd: factor out a helper to decode nfstime4 values
  sunrpc/lockd: fix references to the BKL
  nfsd: fix year-2038 nfs4 state problem
  svcrdma: Handle additional inline content
  svcrdma: Move read list XDR round-up logic
  ...

xprtrdma: Modernize htonl and ntohl

2015-01-30T15:47:48+00:00

Clean up: Replace htonl and ntohl with the be32 equivalents.

Signed-off-by: Chuck Lever 
Reviewed-by: Steve Wise 
Signed-off-by: Anna Schumaker

svcrdma: Support RDMA_NOMSG requests

2015-01-15T20:01:47+00:00

Currently the Linux server can not decode RDMA_NOMSG type requests.
Operations whose length exceeds the fixed size of RDMA SEND buffers,
like large NFSv4 CREATE(NF4LNK) operations, must be conveyed via
RDMA_NOMSG.

For an RDMA_MSG type request, the client sends the RPC/RDMA, RPC
headers, and some or all of the NFS arguments via RDMA SEND.

For an RDMA_NOMSG type request, the client sends just the RPC/RDMA
header via RDMA SEND. The request's read list contains elements for
the entire RPC message, including the RPC header.

NFSD expects the RPC/RMDA header and RPC header to be contiguous in
page zero of the XDR buffer. Add logic in the RDMA READ path to make
the read list contents land where the server prefers, when the
incoming message is a type RDMA_NOMSG message.

Signed-off-by: Chuck Lever 
Reviewed-by: Steve Wise 
Signed-off-by: J. Bruce Fields

svcrdma: Plant reader function in struct svcxprt_rdma

2015-01-15T20:01:46+00:00

The RDMA reader function doesn't change once an svcxprt_rdma is
instantiated. Instead of checking sc_devcap during every incoming
RPC, set the reader function once when the connection is accepted.

Signed-off-by: Chuck Lever 
Reviewed-by: Steve Wise 
Signed-off-by: J. Bruce Fields

svcrdma: Clean up read chunk counting

2015-01-15T20:01:44+00:00

The byte_count argument is not used, and the function is called
only from one place.

Signed-off-by: Chuck Lever 
Reviewed-by: Steve Wise 
Signed-off-by: J. Bruce Fields

svcrdma: Double the default credit limit

2014-07-23T18:20:48+00:00

The RDMA credit limit controls how many concurrent RPCs are allowed
per connection.

An NFS/RDMA client and server exchange their credit limits in the
RPC/RDMA headers. The Linux client and the Solaris client and server
allow 32 credits. The Linux server allows only 16, which limits its
performance.

Set the server's default credit limit to 32, like the other well-
known implementations, so the out-of-the-shrinkwrap performance of
the Linux server is better.

Signed-off-by: Chuck Lever 
Signed-off-by: J. Bruce Fields

svcrdma: refactor marshalling logic

2014-06-06T23:22:50+00:00

This patch refactors the NFSRDMA server marshalling logic to
remove the intermediary map structures.  It also fixes an existing bug
where the NFSRDMA server was not minding the device fast register page
list length limitations.

Signed-off-by: Tom Tucker 
Signed-off-by: Steve Wise

svcrdma: silence a Sparse warning

2012-03-06T23:13:33+00:00

Sparse complains that the definition function definition and the
implementation aren't anotated the same way.

Signed-off-by: Dan Carpenter 
Acked-by: Tom Tucker 
Signed-off-by: J. Bruce Fields

svcrdma: Cleanup sparse warnings in the svcrdma module

2012-02-17T23:38:50+00:00

The svcrdma transport was un-marshalling requests in-place. This resulted
in sparse warnings due to __beXX data containing both NBO and HBO data.

The code has been restructured to do byte-swapping as the header is
parsed instead of when the header is validated immediately after receipt.

Also moved extern declarations for the workqueue and memory pools to the
private header file.

Signed-off-by: Tom Tucker 
Signed-off-by: J. Bruce Fields

svcrdma: Modify the RPC recv path to use FRMR when available

2008-10-06T19:46:01+00:00

RPCRDMA requests that specify a read-list are fetched with RDMA_READ. Using
an FRMR to map the data sink improves NFSRDMA security on transports that
place the RDMA_READ data sink LKEY on the wire because the valid lifetime
of the MR is only the duration of the RDMA_READ. The LKEY is invalidated
when the last RDMA_READ WR completes.

Mapping the data sink also allows for very large amounts to data to be
fetched with a single WR, so if the client is also using FRMR, the entire
RPC read-list can be fetched with a single WR.

Signed-off-by: Tom Tucker