From: Tom Tucker <tom@opengridcomputing.com>
Subject: [RFC,PATCH 00/20] svc: Server Side Transport Switch
Date: Mon, 20 Aug 2007 11:20:00 -0500
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This patchset represents an update to the previously published 
version. The most significant changes are a renaming of the 
transport switch data structures and functions based on a 
recommendation from Chuck Lever. Code cleanup was also done in the
portlist implementation based on feedback from Trond. Additionally, 
the synopsis for the register/unregister services were changed
to return errors and module reference counting was added. 

I've included the original description below for new reviewers.

This patchset implements a sunrpc server side pluggable transport 
switch that supports dynamically registered transports. 

The knfsd daemon has been modified to allow user-mode programs 
to add a new listening endpoint by writing a string
to the portlist file. The format of the string is as follows:

<transport-name> <port>

For example,

# echo rdma 2050 > /proc/fs/nfsd/portlist

Will cause the knfsd daemon to attempt to add a listening endpoint on 
port 2050 using the 'rdma' transport.

Transports register themselves with the transport switch using a
new API that has the following synopsis:

int svc_register_transport(struct svc_sock_ops *xprt)

The text transport name is contained in a field in the xprt structure.
A new service has been added as well to take a transport name
instead of an IP protocol number to specify the transport on which the 
listening endpoint is to be created. This function is defined as follows:

int svc_create_svcsock(struct svc_serv, char *transport_name, 
                       unsigned short port, int flags);

The existing svc_makesock interface was left to avoid impacts to existing 
servers. It has been modified to map IP protocol numbers to transport 
strings.

-- 
Signed-off-by: Tom Tucker <tom@opengridcomputing.com>

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