linux-toradex.git/include/linux/sunrpc/xprt.h, branch v3.0.71

SUNRPC: Support for RPC over AF_LOCAL transports

2011-05-27T21:42:47+00:00

TI-RPC introduces the capability of performing RPC over AF_LOCAL
sockets.  It uses this mainly for registering and unregistering
local RPC services securely with the local rpcbind, but we could
also conceivably use it as a generic upcall mechanism.

This patch provides a client-side only implementation for the moment.
We might also consider a server-side implementation to provide
AF_LOCAL access to NLM (for statd downcalls, and such like).

Autobinding is not supported on kernel AF_LOCAL transports at this
time.  Kernel ULPs must specify the pathname of the remote endpoint
when an AF_LOCAL transport is created.  rpcbind supports registering
services available via AF_LOCAL, so the kernel could handle it with
some adjustment to ->rpcbind and ->set_port.  But we don't need this
feature for doing upcalls via well-known named sockets.

This has not been tested with ULPs that move a substantial amount of
data.  Thus, I can't attest to how robust the write_space and
congestion management logic is.

Signed-off-by: Chuck Lever 
Signed-off-by: Trond Myklebust

SUNRPC: Convert struct rpc_xprt to use atomic_t counters

2011-03-17T16:38:59+00:00

Signed-off-by: Trond Myklebust

rpc: allow xprt_class->setup to return a preexisting xprt

2011-01-11T20:04:10+00:00

This allows us to reuse the xprt associated with a server connection if
one has already been set up.

Signed-off-by: J. Bruce Fields

sunrpc: Tag rpc_xprt with net

2010-10-01T21:18:58+00:00

The net is known from the xprt_create and this tagging will also
give un the context in the conntection workers where real sockets
are created.

Signed-off-by: Pavel Emelyanov 
Signed-off-by: J. Bruce Fields

sunrpc: Add net to xprt_create

2010-10-01T21:18:57+00:00

Signed-off-by: Pavel Emelyanov 
Signed-off-by: J. Bruce Fields

sunrpc: Factor out rpc_xprt freeing

2010-10-01T21:18:53+00:00

Signed-off-by: Pavel Emelyanov 
Signed-off-by: J. Bruce Fields

sunrpc: Factor out rpc_xprt allocation

2010-10-01T21:18:52+00:00

Signed-off-by: Pavel Emelyanov 
Signed-off-by: J. Bruce Fields

SUNRPC: Move the bound cred to struct rpc_rqst

2010-08-04T12:54:09+00:00

This will allow us to save the original generic cred in rpc_message, so
that if we migrate from one server to another, we can generate a new bound
cred without having to punt back to the NFS layer.

Signed-off-by: Trond Myklebust

SUNRPC: Move the task->tk_bytes_sent and tk_rtt to struct rpc_rqst

2010-05-14T19:09:36+00:00

It seems strange to maintain stats for bytes_sent in one structure, and
bytes received in another. Try to assemble all the RPC request-related
stats in struct rpc_rqst

Signed-off-by: Trond Myklebust

SUNRPC: Replace jiffies-based metrics with ktime-based metrics

2010-05-14T19:09:33+00:00

Currently RPC performance metrics that tabulate elapsed time use
jiffies time values.  This is problematic on systems that use slow
jiffies (for instance 100HZ systems built for paravirtualized
environments).  It is also a problem for computing precise latency
statistics for advanced network transports, such as InfiniBand,
that can have round-trip latencies significanly faster than a single
clock tick.

For the RPC client, adopt the high resolution time stamp mechanism
already used by the network layer and blktrace: ktime.

We use ktime format time stamps for all internal computations, and
convert to milliseconds for presentation.  As a result, we need only
addition operations in the performance critical paths; multiply/divide
is required only for presentation.

We could report RTT metrics in microseconds.  In fact the mountstats
format is versioned to accomodate exactly this kind of interface
improvement.

For now, however, we'll stay with millisecond precision for
presentation to maintain backwards compatibility with the handful of
currently deployed user space tools.  At a later point, we'll move to
an API such as BDI_STATS where a finer timestamp precision can be
reported.

Signed-off-by: Chuck Lever 
Signed-off-by: Trond Myklebust