tk_xprt is just a shortcut for tk_client->cl_xprt, however cl_xprt is
defined as an __rcu variable. Replace dereferences of tk_xprt with
non-rcu dereferences where it is safe to do so.
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

The client side RDMA transport will bug check if it receives a duplicate
reply, instead we should simply drop the duplicate reply.
Signed-off-by: NTom Tucker <tom@ogc.us>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

Signed-off-by: NCong Wang <amwang@redhat.com>

The RPCRDMA marshalling logic assumed that xdr->page_base was an
offset into the first page of xdr->page_list. It is in fact an
offset into the xdr->page_list itself, that is, it selects the
first page in the page_list and the offset into that page.

The symptom depended in part on the rpc_memreg_strategy, if it was
FRMR, or some other one-shot mapping mode, the connection would get
torn down on a base and bounds error. When the badly marshalled RPC
was retransmitted it would reconnect, get the error, and tear down the
connection again in a loop forever. This resulted in a hung-mount. For
the other modes, it would result in silent data corruption. This bug is
most easily reproduced by writing more data than the filesystem
has space for.

This fix corrects the page_base assumption and otherwise simplifies
the iov mapping logic.
Signed-off-by: NTom Tucker <tom@ogc.us>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

This patch updates the computation to include the worst case situation
where three FRMR are required to map a single RPC REQ.
Signed-off-by: NTom Tucker <tom@ogc.us>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

Certain client rpc's which contain both lengthy page-contained
metadata and a non-empty xdr_tail buffer require careful handling
to avoid overlapped memory copying. Rearranging of existing rpcrdma
marshaling code avoids it; this fixes an NFSv4 symlink creation error
detected with connectathon basic/test8 to multiple servers.
Signed-off-by: NTom Talpey <tmtalpey@gmail.com>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

The send marshaling code split a particular dprintk across two
lines, which makes it hard to extract from logfiles.
Signed-off-by: NTom Talpey <talpey@netapp.com>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

The xprt_connect call path does not expect such errors as ECONNREFUSED
to be returned from failed transport connection attempts, otherwise it
translates them to EIO and signals fatal errors. For example, mount.nfs
prints simply "internal error". Translate all such errors to ENOTCONN
from RPC/RDMA to match sockets behavior.
Signed-off-by: NTom Talpey <talpey@netapp.com>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

The RPC/RDMA protocol allows clients and servers to avoid RDMA
operations for data which is purely the result of XDR padding.
On the client, automatically insert the necessary padding for
such server replies, and optionally don't marshal such chunks.
Signed-off-by: NTom Talpey <talpey@netapp.com>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

An RPC/RDMA client cannot retransmit on an unbroken connection,
doing so violates its flow control with the server.
Signed-off-by: NTom Talpey <talpey@netapp.com>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Nit: rl_nchunks is an unsigned integer, so pass it into
rpcrdma_count_chunks() via an unsigned integer argument.  This eliminates
a harmless mixed sign comparison in rpcrdma_count_chunks()
Signed-off-by: NChuck Lever <chuck.lever@oracle.com>
Cc: Thomas Talpey <Thomas.Talpey@netapp.com>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

Keep the type of the buffer position the same during iovec conversion to
reduce the likelihood of unexpected results from comparisons and length
computations.
Signed-off-by: NChuck Lever <chuck.lever@oracle.com>
Cc: Thomas Talpey <Thomas.Talpey@netapp.com>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

Signed-off-by: NYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

rpcrdma_convert_iovs is passed an xdr_buf representing either an RPC
request or an RPC reply. In the case of a request, several
calculations and tests involving pos are unnecessary. In the case of a
reply, several calculations and tests involving pos are incorrect (the
code tests pos against the reply xdr buf's len field, which is always
0 at the time rpcrdma_convert_iovs is executed). This change removes
the incorrect/unnecessary calculations and tests involving pos.

This fixes an observed problem when reading certain file sizes over
NFS/RDMA.
Signed-off-by: NTom Tucker <tom@opengridcomputing.com>
Signed-off-by: NTom Talpey <talpey@netapp.com>
Signed-off-by: NJames Lentini <jlentini@netapp.com>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

as some architectures have unsigned long for u64.

net/sunrpc/xprtrdma/rpc_rdma.c: In function 'rpcrdma_create_chunks':
net/sunrpc/xprtrdma/rpc_rdma.c:222: warning: format '%llx' expects type 'long long unsigned int', but argument 4 has type 'u64'
net/sunrpc/xprtrdma/rpc_rdma.c:234: warning: format '%llx' expects type 'long long unsigned int', but argument 5 has type 'u64'
net/sunrpc/xprtrdma/rpc_rdma.c: In function 'rpcrdma_count_chunks':
net/sunrpc/xprtrdma/rpc_rdma.c:577: warning: format '%llx' expects type 'long long unsigned int', but argument 4 has type 'u64

Noticed on PowerPC pseries_defconfig build.
Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

rpcrdma stuff lacks endianness annotations for on-the-wire data.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This implements the marshaling and unmarshaling of the rpcrdma transport
headers. Connection management is also addressed.
Signed-off-by: NTom Talpey <talpey@netapp.com>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

This implements the configuration and building of the core transport
switch implementation of the rpcrdma transport. Stubs are provided for
the rpcrdma protocol handling, and the infiniband/iwarp verbs interface.
These are provided in following patches.
Signed-off-by: NTom Talpey <talpey@netapp.com>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>