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draft RPC tapset

Hi folks,

I am working on RPC trace hooks for Systemtap/LKET. These trace
hooks can help dynamically trace the activities on both RPC
clients and servers.

The functions in the sunrpc module (see net/sunrpc/sunrpc_syms.c
and others) are roughly categorized into several groups:
* for RPC scheduler
* for RPC client
* for RPC client transport
* for RPC client credential cache
* for RPC server
* for RPC statistics
* for RPC caching
* for generic XDR

As a start point, I picked the trace hooks mainly from RPC client,
scheduler and server side. I am sure it is not always enough, so
anyone can extend this tapset whenever necessary.

And I want to make sure the trace hooks I chose are in right places
and the parameters are correctly handled. It will be very appreciated
if you can take a look at it. Please fell free to let me know if
you have any questions/suggestions/comments.

Thanks.

Gui,Jian

===================================================================
# Copyright (C) 2005, 2006 IBM Corp.
#
# This file is part of systemtap, and is free software.  You can
# redistribute it and/or modify it under the terms of the GNU General
# Public License (GPL); either version 2, or (at your option) any
# later version.
%{
#include <linux/kernel.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svc.h>
%}

probe sunrpc.entry =
	sunrpc.clnt.entry,
	sunrpc.svc.entry,
	sunrpc.sched.entry
{}

probe sunrpc.return =
	sunrpc.clnt.return,
	sunrpc.svc.return,
	sunrpc.sched.return
{}

####################################################################
#                Probe points on RPC client functions              #
####################################################################

probe sunrpc.clnt.entry =
	sunrpc.clnt.create_client,
	sunrpc.clnt.clone_client,
	sunrpc.clnt.bind_new_program,
	sunrpc.clnt.shutdown_client,
	sunrpc.clnt.call_sync,
	sunrpc.clnt.call_async,
	sunrpc.clnt.restart_call
{}

probe sunrpc.clnt.return =
	sunrpc.clnt.create_client.return,
	sunrpc.clnt.clone_client.return,
	sunrpc.clnt.bind_new_program.return,
	sunrpc.clnt.shutdown_client.return,
	sunrpc.clnt.call_sync.return,
	sunrpc.clnt.call_async.return,
	sunrpc.clnt.restart_call.return
{}

#
# Fires when an RPC client is to be created
#
# struct rpc_clnt *
# rpc_create_client(struct rpc_xprt *xprt, char *servname,
# 	struct rpc_program *info, u32 version,
# 	rpc_authflavor_t authflavor)
#
probe sunrpc.clnt.create_client = kernel.function("rpc_create_client") ?,
      	module("sunrpc").function("rpc_create_client") ?
{
	servername = kernel_string($servname)	/* server name */
	progname = kernel_string($info->name)	/* program name */
	prog = $info->number			/* program number */
	vers = vers_from_prog($info, $version)	/* program version */
	prot = $xprt->prot		/* IP protocol */
	port = $xprt->port		/* port number */
	authflavor = $authflavor	/* authentication flavor */

	name = "sunrpc.clnt.create_client"
	argstr = sprintf("%s %s %d %d %d %d %d", servername, progname,
			prog, vers, prot, port, authflavor)
}

probe sunrpc.clnt.create_client.return =
	kernel.function("rpc_create_client").return ?,
      	module("sunrpc").function("rpc_create_client").return ?
{
	name = "sunrpc.clnt.create_client"
}

#
# Fires when the RPC client structure is to be cloned
#
# struct rpc_clnt * rpc_clone_client(struct rpc_clnt *clnt)
#
probe sunrpc.clnt.clone_client = kernel.function("rpc_clone_client") ?,
      	module("sunrpc").function("rpc_clone_client") ?
{
	servname = kernel_string($clnt->cl_server)
	progname = kernel_string($clnt->cl_protname)
	prog = prog_from_clnt($clnt)
	vers = vers_from_clnt($clnt)
	prot = prot_from_clnt($clnt)
	port = port_from_clnt($clnt)
	authflavor = $clnt->cl_auth->au_flavor
	
	name = "sunrpc.clnt.clone_client"
	argstr = sprintf("%s %s %d %d %d %d %d", servname, progname,
			prog, vers, prot, port, authflavor)
}

probe sunrpc.clnt.clone_client.return =
	kernel.function("rpc_clone_client").return ?,
      	module("sunrpc").function("rpc_clone_client").return ?
{
	name = "sunrpc.clnt.clone_client"
}

#
# Fires when a new RPC program is to be bound an existing client
#
# struct rpc_clnt * rpc_bind_new_program(struct rpc_clnt *old,
# 	struct rpc_program *program, int vers)
#
probe sunrpc.clnt.bind_new_program =
	kernel.function("rpc_bind_new_program") ?,
      	module("sunrpc").function("rpc_bind_new_program") ?
{
	servname = kernel_string($old->cl_server)
	old_progname = kernel_string($old->cl_protname)
	old_prog = prog_from_clnt($old)
	old_vers = vers_from_clnt($old)

	progname = kernel_string($program->name)
	prog = $program->number
	vers = vers_from_prog($program, $vers)

	name = "sunrpc.clnt.bind_new_program"
	argstr = sprintf("%s %s %d %s %d", servname, old_progname,
			old_vers, progname, vers)
}

probe sunrpc.clnt.bind_new_program.return =
	kernel.function("rpc_bind_new_program").return ?,
      	module("sunrpc").function("rpc_bind_new_program").return ?
{
	name = "sunrpc.clnt.bind_new_program"
}

#
# Fires when an RPC client is to be shut down.
#
# int rpc_shutdown_client(struct rpc_clnt *clnt)
#
probe sunrpc.clnt.shutdown_client = kernel.function("rpc_shutdown_client") ?,
module("sunrpc").function("rpc_shutdown_client") ?
{
servname = kernel_string($clnt->cl_server)
progname = kernel_string($clnt->cl_protname)
vers = vers_from_clnt($clnt)
tasks = tasks_from_clnt($clnt)

	/* per-program statistics */
	netcnt = $clnt->cl_stats->netcnt
	netreconn = $clnt->cl_stats->netreconn
	rpccnt = $clnt->cl_stats->rpccnt
	rpcgarbage = $clnt->cl_stats->rpcgarbage

	/* per-client statistics */
	om_ops = $clnt->cl_metrics->om_ops	/* count of operations */
	om_ntrans = $clnt->cl_metrics->om_ntrans/* count of RPC transmissions */
	om_bytes_sent = $clnt->cl_metrics->om_bytes_sent /* count of bytes out*/
	om_bytes_recv = $clnt->cl_metrics->om_bytes_recv /* count of bytes in */
	om_queue = $clnt->cl_metrics->om_queue	/* jiffies queued for xmit */
	om_rtt = $clnt->cl_metrics->om_rtt	/* RPC RTT jiffies */
	om_execute = $clnt->cl_metrics->om_execute /* RPC execution jiffies */

	name = "sunrpc.clnt.shutdown_client"
	argstr = sprintf("%s %s %d %d", servname, progname, vers, tasks)
}

probe sunrpc.clnt.shutdown_client.return =
	kernel.function("rpc_shutdown_client").return ?,
      	module("sunrpc").function("rpc_shutdown_client").return ?
{
	name = "sunrpc.clnt.shutdown_client"
	retstr = returnstr($return)
}

#
# int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg,
# 	int flags)
#
probe sunrpc.clnt.call_sync = kernel.function("rpc_call_sync") ?,
      	module("sunrpc").function("rpc_call_sync") ?
{
	servname = kernel_string($clnt->cl_server)
	progname = kernel_string($clnt->cl_protname)
	prog = prog_from_clnt($clnt)
	vers = vers_from_clnt($clnt)
	prot = prot_from_clnt($clnt)
	port = port_from_clnt($clnt)
	xid  = xid_from_clnt($clnt)
	dead = $clnt->cl_dead

	proc = proc_from_msg($msg)
	procname= $msg->rpc_proc->p_name
		? kernel_string($msg->rpc_proc->p_name) : "NULL"
	flags = $flags
	
	name = "sunrpc.clnt.call_sync"
	argstr = sprintf("%s %d %s %d %s 0x%x", servname, xid,
			progname, vers, procname, flags)
}

probe sunrpc.clnt.call_sync.return =
	kernel.function("rpc_call_sync").return ?,
      	module("sunrpc").function("rpc_call_sync").return ?
{
	name = "sunrpc.clnt.call_sync"
	retstr = returnstr($return)
}

#
# int rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg,
# 	int flags, const struct rpc_call_ops *tk_ops, void *data)
#
probe sunrpc.clnt.call_async = kernel.function("rpc_call_async") ?,
      	module("sunrpc").function("rpc_call_async") ?
{
	servname = kernel_string($clnt->cl_server)
	progname = kernel_string($clnt->cl_protname)
	prog = prog_from_clnt($clnt)
	vers = vers_from_clnt($clnt)
	prot = prot_from_clnt($clnt)
	port = port_from_clnt($clnt)
	xid  = xid_from_clnt($clnt)
	dead = $clnt->cl_dead

	proc = proc_from_msg($msg)
	procname= $msg->rpc_proc->p_name
		? kernel_string($msg->rpc_proc->p_name) : "NULL"

	flags = $flags
	
	name = "sunrpc.clnt.call_async"
	argstr = sprintf("%s %d %s %d %s 0x%x", servname, xid, progname,
			vers, procname, flags)
}

probe sunrpc.clnt.call_async.return =
	kernel.function("rpc_call_async").return ?,
      	module("sunrpc").function("rpc_call_async").return ?
{
	name = "sunrpc.clnt.call_async"
	retstr = returnstr($return)
}

#
# Fires when an (async) RPC call is to be restarted
#
# void rpc_restart_call(struct rpc_task *task)
#
probe sunrpc.clnt.restart_call = kernel.function("rpc_restart_call") ?,
      	module("sunrpc").function("rpc_restart_call") ?
{
	xid = $task->tk_rqstp->rq_xid
	prog = prog_from_clnt($task->tk_client)
	vers = vers_from_clnt($task->tk_client)

	tk_pid = $task->tk_pid
	tk_flags = $task->tk_flags

	name = "sunrpc.clnt.restart_call"
	argstr = sprintf("%d %d %d %d %d", xid, prog, vers,
			tk_pid, tk_flags)
}

probe sunrpc.clnt.restart_call.return =
	kernel.function("rpc_restart_call").return ?,
      	module("sunrpc").function("rpc_restart_call").return ?
{
	name = "sunrpc.clnt.restart_call"
}

####################################################################
#                Probe points on RPC server interface              #
####################################################################

probe sunrpc.svc.entry =
	sunrpc.svc.register,
	sunrpc.svc.create,
	sunrpc.svc.destroy,
	sunrpc.svc.process,
	sunrpc.svc.authorise,
	sunrpc.svc.recv,
	sunrpc.svc.send,
	sunrpc.svc.drop
{}

probe sunrpc.svc.return =
	sunrpc.svc.register.return,
	sunrpc.svc.create.return,
	sunrpc.svc.destroy.return,
	sunrpc.svc.process.return,
	sunrpc.svc.authorise.return,
	sunrpc.svc.recv.return,
	sunrpc.svc.send.return,
	sunrpc.svc.drop.return
{}

#
# Fires when an RPC service is to be registered with the local portmapper.
# If proto and port == 0, it means to unregister a service.
#
# int svc_register(struct svc_serv *serv, int proto, unsigned short port)
#
probe sunrpc.svc.register = kernel.function("svc_register") ?,
      	module("sunrpc").function("svc_register") ?
{
	sv_name = kernel_string($serv->sv_name)
	progname = kernel_string($serv->sv_program->pg_name)
	prog = $serv->sv_program->pg_prog
	prot = $proto
	port = $port

	name = "sunrpc.svc.register"
	argstr = sprintf("%s %s %d %d", sv_name, progname, prot, port)
}

probe sunrpc.svc.register.return = kernel.function("svc_register").return ?,
module("sunrpc").function("svc_register").return ?
{
name = "sunrpc.svc.register"
retstr = returnstr($return)
}

#
# Fires when an RPC service is to be created
#
# struct svc_serv *
# svc_create(struct svc_program *prog, unsigned int bufsize)
#
probe sunrpc.svc.create = kernel.function("svc_create") ?,
      	module("sunrpc").function("svc_create") ?
{
	pg_name = kernel_string($prog->pg_name)
	pg_prog = $prog->pg_prog
	pg_hivers = $prog->pg_hivers
	pg_nvers  = $prog->pg_nvers
	bufsize = $bufsize
	
	name = "sunrpc.svc.create"
	argstr = sprintf("%s %d %d %d %d", pg_name, pg_prog,
			pg_hivers, pg_nvers, bufsize)
}

probe sunrpc.svc.create.return = kernel.function("svc_create").return ?,
      	module("sunrpc").function("svc_create").return ?
{
	name = "sunrpc.svc.create"
}

#
# Fires when an RPC service is to be destroyed
#
# void svc_destroy(struct svc_serv *serv)
#
probe sunrpc.svc.destroy = kernel.function("svc_destroy") ?,
      	module("sunrpc").function("svc_destroy") ?
{
	sv_name = kernel_string($serv->sv_name) /* service name */
	sv_progname = kernel_string($serv->sv_program->pg_name)
	sv_prog = $serv->sv_program->pg_prog
	sv_nrthreads = $serv->sv_nrthreads

	/* RPC statistics */
	netcnt = $serv->sv_stats->netcnt
	netcpconn = $serv->sv_stats->nettcpconn
	rpccnt = $serv->sv_stats->rpccnt
	rpcbadclnt = $serv->sv_stats->rpcbadclnt
	
	name = "sunrpc.svc.destroy"
	argstr = sprintf("%s %d %d", sv_name, sv_prog, sv_nrthreads)
}

probe sunrpc.svc.destroy.return = kernel.function("svc_destroy").return ?,
      	module("sunrpc").function("svc_destroy").return ?
{
	name = "sunrpc.svc.destroy"
}

#
# Fires when an RPC request is to be processed
#
# int svc_process(struct svc_serv *serv, struct svc_rqst *rqstp)
#
probe sunrpc.svc.process = kernel.function("svc_process") ?,
      	module("sunrpc").function("svc_process") ?
{
	sv_name = kernel_string($serv->sv_name) /* service name */
	sv_prog = $serv->sv_program->pg_prog

	peer_ip = addr_from_rqst($rqstp)/* peer address */
	rq_xid = $rqstp->rq_xid		/* transmission id */
	rq_prog = $rqstp->rq_prog	/* program number */
	rq_vers = $rqstp->rq_vers	/* program version */
	rq_proc = $rqstp->rq_proc	/* procedure number */
	rq_prot = $rqstp->rq_prot	/* IP protocol */
	
	name = "sunrpc.svc.process"
	argstr = sprintf("%s %d %d %d %d %d %d", sv_name, sv_prog, peer_ip,
			rq_xid, rq_prog, rq_vers, rq_proc)
}

probe sunrpc.svc.process.return = kernel.function("svc_process").return ?,
      	module("sunrpc").function("svc_process").return ?
{
	name = "sunrpc.svc.process"
	retstr = returnstr($return)
}

#
# int svc_authorise(struct svc_rqst *rqstp)
#
probe sunrpc.svc.authorise = kernel.function("svc_authorise")?,
      	module("sunrpc").function("svc_authorise")?
{
	peer_ip = addr_from_rqst($rqstp)	/* peer address */
	xid  = $rqstp->rq_xid	/* transmission id */
	prog = $rqstp->rq_prog	/* program number */
	vers = $rqstp->rq_vers	/* program version */
	proc = $rqstp->rq_proc	/* procedure number */
	prot = $rqstp->rq_prot	/* IP protocol */

	name = "sunrpc.svc.authorise"
	argstr = sprintf("%d %d %d %d %d %d %d", peer_ip, xid, prog,
			vers, proc, prot, addr)
}

probe sunrpc.svc.authorise.return = kernel.function("svc_authorise").return ?,
module("sunrpc").function("svc_authorise").return ?
{
name = "sunrpc.svc.authorise"
retstr = returnstr($return)
}

#
# Fires when receiving the next request on any socket.
#
# int svc_recv(struct svc_serv *serv, struct svc_rqst *rqstp, long timeout)
#
probe sunrpc.svc.recv = kernel.function("svc_recv")?,
module("sunrpc").function("svc_recv")?
{
sv_name = kernel_string($serv->sv_name)
timeout = $timeout

	name = "sunrpc.svc.recv"
	argstr = sprintf("%s %d", sv_name, timeout)
}

probe sunrpc.svc.recv.return = kernel.function("svc_recv").return ?,
      	module("sunrpc").function("svc_recv").return ?
{
	name = "sunrpc.svc.recv"
	argstr = returnstr($return)
}

#
# Fires when want to return reply to client.
#
# int svc_send(struct svc_rqst *rqstp)
#
probe sunrpc.svc.send = kernel.function("svc_send")?,
      	module("sunrpc").function("svc_send")?
{
	sv_name = kernel_string($rqstp->rq_server->sv_name)
	sv_prog = $rqstp->rq_server->sv_program->pg_prog

	peer_ip = addr_from_rqst($rqstp) /* peer address */
	xid  = $rqstp->rq_xid	/* transmission id */
	prog = $rqstp->rq_prog	/* program number */
	vers = $rqstp->rq_vers	/* program version */
	proc = $rqstp->rq_proc	/* procedure number */
	prot = $rqstp->rq_prot	/* IP protocol */
	
	name = "sunrpc.svc.send"
	argstr = sprintf("%s %d %d %d %d %d %d %d", sv_name, sv_prog,
			peer_ip, xid, prog, vers, proc, prot)
}

probe sunrpc.svc.send.return = kernel.function("svc_send").return ?,
      	module("sunrpc").function("svc_send").return ?
{
	name = "sunrpc.svc.send"
	retstr = returnstr($return)
}

#
# Fires when a request is to be dropped
#
# void svc_drop(struct svc_rqst *rqstp)
#
probe sunrpc.svc.drop = kernel.function("svc_drop")?,
      	module("sunrpc").function("svc_drop")?
{
	sv_name = kernel_string($rqstp->rq_server->sv_name)
	sv_prog = $rqstp->rq_server->sv_program->pg_prog

	peer_ip = addr_from_rqst($rqstp) /* peer address */
	xid  = $rqstp->rq_xid	/* transmission id */
	prog = $rqstp->rq_prog	/* program number */
	vers = $rqstp->rq_vers	/* program version */
	proc = $rqstp->rq_proc	/* procedure number */
	prot = $rqstp->rq_prot	/* IP protocol */
	
	name = "sunrpc.svc.drop"
	argstr = sprintf("%s %d %d %d %d %d %d %d", sv_name, sv_prog,
			peer_ip, xid, prog, vers, proc, prot)
}

probe sunrpc.svc.drop.return = kernel.function("svc_drop").return ?,
      	module("sunrpc").function("svc_drop").return ?
{
	name = "sunrpc.svc.drop"
}

####################################################################
#                   Probe points on RPC scheduler                  #
####################################################################

probe sunrpc.sched.entry =
	sunrpc.sched.new_task,
	sunrpc.sched.execute,
	sunrpc.sched.delay,
	sunrpc.sched.release_task
{}

probe sunrpc.sched.return =
	sunrpc.sched.new_task.return,
	sunrpc.sched.execute.return,
	sunrpc.sched.delay.return,
	sunrpc.sched.release_task.return
{}

#
# Fires when the RPC `scheduler'(or rather, the finite state machine)
# is to be executed
#
# static int __rpc_execute(struct rpc_task *task)
#
probe sunrpc.sched.execute = kernel.function("__rpc_execute") ?,
      	module("sunrpc").function("__rpc_execute") ?
{
	xid = xid_from_clnt($task->tk_client)
	prog = prog_from_clnt($task->tk_client)
	vers = vers_from_clnt($task->tk_client)
	prot = prot_from_clnt($task->tk_client)
	tk_pid = $task->tk_pid
	tk_flags = $task->tk_flags

	name = "sunrpc.sched.execute"
	argstr = sprintf("%d %d %d %d %d %d", xid, prog,
			vers, prot, tk_pid, tk_flags)
}

probe sunrpc.sched.execute.return = kernel.function("__rpc_execute").return ?,
module("sunrpc").function("__rpc_execute").return ?
{
name = "sunrpc.sched.execute"
retstr = returnstr($return)
}

#
# Fires when a task is to be delayed
#
# void rpc_delay(struct rpc_task *task, unsigned long delay)
#
probe sunrpc.sched.delay = kernel.function("rpc_delay") ?,
      module("sunrpc").function("rpc_delay") ?
{
	xid = xid_from_clnt($task->tk_client)
	prog = prog_from_clnt($task->tk_client)
	vers = vers_from_clnt($task->tk_client)
	prot = prot_from_clnt($task->tk_client)
	tk_pid = $task->tk_pid
	tk_flags = $task->tk_flags
	delay = $delay

	name = "sunrpc.clnt.delay"
	argstr = sprintf("%d %d %d %d %d %d", xid, prog, vers,
			prot, tk_pid, tk_flags)
}

probe sunrpc.sched.delay.return = kernel.function("rpc_delay").return ?,
      module("sunrpc").function("rpc_delay").return ?
{
	name = "sunrpc.clnt.delay"
}

#
# Fires when a new task is to be created for the specified client.
#
# struct rpc_task * rpc_new_task(struct rpc_clnt *clnt, int flags,
# 	const struct rpc_call_ops *tk_ops, void *calldata)
#
probe sunrpc.sched.new_task = kernel.function("rpc_new_task") ?,
      	module("sunrpc").function("rpc_new_task") ?
{
	xid = xid_from_clnt($clnt)
	prog = prog_from_clnt($clnt)
	vers = vers_from_clnt($clnt)
	prot = prot_from_clnt($clnt)
	flags  = $flags

	name = "sunrpc.sched.new_task"
	argstr = sprintf("%d %d %d %d %d", xid, prog, vers, prot, flags)
}

probe sunrpc.sched.new_task.return = kernel.function("rpc_new_task").return ?,
module("sunrpc").function("rpc_new_task").return ?
{
name = "sunrpc.sched.new_task"
}

#
# Fires when all resources associated with a task are to be released
#
# void rpc_release_task(struct rpc_task *task)
#
probe sunrpc.sched.release_task = kernel.function("rpc_release_task") ?,
      	module("sunrpc").function("rpc_release_task") ?
{
	xid = xid_from_clnt($task->tk_client)
	prog = prog_from_clnt($task->tk_client)
	vers = vers_from_clnt($task->tk_client)
	prot = prot_from_clnt($task->tk_client)
	flags  = $task->tk_flags

	name = "sunrpc.sched.release_task"
	argstr = sprintf("%d %d %d %d %d", xid, prog, vers, prot, flags)
}

probe sunrpc.sched.release_task.return =
	kernel.function("rpc_release_task").return ?,
      	module("sunrpc").function("rpc_release_task").return ?
{
	name = "sunrpc.sched.release_task"
}

####################################################################
#                       Helpler functions                          #
####################################################################

function xid_from_clnt:long(clnt:long)
%{
	struct rpc_clnt *clnt = (struct rpc_clnt *)THIS->clnt;
	THIS->__retvalue = clnt ? clnt->cl_xprt->tcp_xid : 0;
%}

function prog_from_clnt:long(clnt:long)
%{
	struct rpc_clnt *clnt = (struct rpc_clnt *)THIS->clnt;
	THIS->__retvalue = clnt ? clnt->cl_pmap->pm_prog : 0;
%}

function vers_from_clnt:long(clnt:long)
%{
	struct rpc_clnt *clnt = (struct rpc_clnt *)THIS->clnt;
	THIS->__retvalue = clnt ? clnt->cl_pmap->pm_vers : 0;
%}

function prot_from_clnt:long(clnt:long)
%{
	struct rpc_clnt *clnt = (struct rpc_clnt *)THIS->clnt;
	THIS->__retvalue = clnt ? clnt->cl_pmap->pm_prot : 0;
%}

function port_from_clnt:long(clnt:long)
%{
	struct rpc_clnt *clnt = (struct rpc_clnt *)THIS->clnt;
	THIS->__retvalue = clnt ? clnt->cl_pmap->pm_port : 0;
%}

function tasks_from_clnt:long(clnt:long)
%{
	struct rpc_clnt *clnt = (struct rpc_clnt *)THIS->clnt;
	THIS->__retvalue = atomic_read(&clnt->cl_users);
%}

function proc_from_msg:long(msg:long)
%{
	struct rpc_message *msg = (struct rpc_message *)THIS->msg;
	THIS->__retvalue = msg ? msg->rpc_proc->p_proc : 0;
%}

function vers_from_prog:long(program:long, vers:long)
%{
struct rpc_program *program = (struct rpc_program *)THIS->program;
if (!program || THIS->vers >= program->nrvers || !program->version[THIS->vers])
THIS->__retvalue = 0;
else
THIS->__retvalue = program->version[THIS->vers]->number;
%}

function addr_from_rqst:long(rqstp:long)
%{
	struct svc_rqst *rqstp = (struct svc_rqst *)THIS->rqstp;
	THIS->__retvalue = rqstp ? rqstp->rq_addr.sin_addr.s_addr : 0;
%}

# Copyright (C) 2005, 2006 IBM Corp.
#
# This file is part of systemtap, and is free software.  You can
# redistribute it and/or modify it under the terms of the GNU General
# Public License (GPL); either version 2, or (at your option) any
# later version.
%{
#include <linux/kernel.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svc.h>
%}

probe sunrpc.entry =
	sunrpc.clnt.entry,
	sunrpc.svc.entry,
	sunrpc.sched.entry
{}

probe sunrpc.return = 
	sunrpc.clnt.return,
	sunrpc.svc.return,
	sunrpc.sched.return
{}

####################################################################
#                Probe points on RPC client functions              #
####################################################################

probe sunrpc.clnt.entry = 
	sunrpc.clnt.create_client,
	sunrpc.clnt.clone_client,
	sunrpc.clnt.bind_new_program,
	sunrpc.clnt.shutdown_client,
	sunrpc.clnt.call_sync,
	sunrpc.clnt.call_async,
	sunrpc.clnt.restart_call
{}

probe sunrpc.clnt.return = 
	sunrpc.clnt.create_client.return,
	sunrpc.clnt.clone_client.return,
	sunrpc.clnt.bind_new_program.return,
	sunrpc.clnt.shutdown_client.return,
	sunrpc.clnt.call_sync.return,
	sunrpc.clnt.call_async.return,
	sunrpc.clnt.restart_call.return
{}

#
# Fires when an RPC client is to be created
# 
# struct rpc_clnt * 
# rpc_create_client(struct rpc_xprt *xprt, char *servname, 
# 	struct rpc_program *info, u32 version, 
# 	rpc_authflavor_t authflavor)
#
probe sunrpc.clnt.create_client = kernel.function("rpc_create_client") ?,
      	module("sunrpc").function("rpc_create_client") ?
{
	servername = kernel_string($servname)	/* server name */
	progname = kernel_string($info->name)	/* program name */
	prog = $info->number			/* program number */
	vers = vers_from_prog($info, $version)	/* program version */
	prot = $xprt->prot		/* IP protocol */
	port = $xprt->port		/* port number */
	authflavor = $authflavor	/* authentication flavor */

	name = "sunrpc.clnt.create_client"
	argstr = sprintf("%s %s %d %d %d %d %d", servername, progname, 
			prog, vers, prot, port, authflavor)
}

probe sunrpc.clnt.create_client.return = 
	kernel.function("rpc_create_client").return ?,
      	module("sunrpc").function("rpc_create_client").return ?
{
	name = "sunrpc.clnt.create_client"
}

#
# Fires when the RPC client structure is to be cloned
# 
# struct rpc_clnt * rpc_clone_client(struct rpc_clnt *clnt)
#
probe sunrpc.clnt.clone_client = kernel.function("rpc_clone_client") ?,
      	module("sunrpc").function("rpc_clone_client") ?
{
	servname = kernel_string($clnt->cl_server)
	progname = kernel_string($clnt->cl_protname)
	prog = prog_from_clnt($clnt)
	vers = vers_from_clnt($clnt)
	prot = prot_from_clnt($clnt)
	port = port_from_clnt($clnt)
	authflavor = $clnt->cl_auth->au_flavor
	
	name = "sunrpc.clnt.clone_client"
	argstr = sprintf("%s %s %d %d %d %d %d", servname, progname, 
			prog, vers, prot, port, authflavor)
}

probe sunrpc.clnt.clone_client.return = 
	kernel.function("rpc_clone_client").return ?,
      	module("sunrpc").function("rpc_clone_client").return ?
{
	name = "sunrpc.clnt.clone_client"
}

#
# Fires when a new RPC program is to be bound an existing client
#
# struct rpc_clnt * rpc_bind_new_program(struct rpc_clnt *old, 
# 	struct rpc_program *program, int vers)
#
probe sunrpc.clnt.bind_new_program = 
	kernel.function("rpc_bind_new_program") ?,
      	module("sunrpc").function("rpc_bind_new_program") ?
{
	servname = kernel_string($old->cl_server)
	old_progname = kernel_string($old->cl_protname)
	old_prog = prog_from_clnt($old)
	old_vers = vers_from_clnt($old)

	progname = kernel_string($program->name)
	prog = $program->number
	vers = vers_from_prog($program, $vers)

	name = "sunrpc.clnt.bind_new_program"
	argstr = sprintf("%s %s %d %s %d", servname, old_progname, 
			old_vers, progname, vers)
}

probe sunrpc.clnt.bind_new_program.return = 
	kernel.function("rpc_bind_new_program").return ?,
      	module("sunrpc").function("rpc_bind_new_program").return ?
{
	name = "sunrpc.clnt.bind_new_program"
}

#
# Fires when an RPC client is to be shut down.
#
# int rpc_shutdown_client(struct rpc_clnt *clnt)
#
probe sunrpc.clnt.shutdown_client = kernel.function("rpc_shutdown_client") ?,
      	module("sunrpc").function("rpc_shutdown_client") ?
{
	servname = kernel_string($clnt->cl_server)
	progname = kernel_string($clnt->cl_protname)
	vers = vers_from_clnt($clnt)
	tasks = tasks_from_clnt($clnt)

	/* per-program statistics */
	netcnt = $clnt->cl_stats->netcnt
	netreconn = $clnt->cl_stats->netreconn
	rpccnt = $clnt->cl_stats->rpccnt
	rpcgarbage = $clnt->cl_stats->rpcgarbage

	/* per-client statistics */
	om_ops = $clnt->cl_metrics->om_ops	/* count of operations */
	om_ntrans = $clnt->cl_metrics->om_ntrans/* count of RPC transmissions */
	om_bytes_sent = $clnt->cl_metrics->om_bytes_sent /* count of bytes out*/
	om_bytes_recv = $clnt->cl_metrics->om_bytes_recv /* count of bytes in */
	om_queue = $clnt->cl_metrics->om_queue	/* jiffies queued for xmit */
	om_rtt = $clnt->cl_metrics->om_rtt	/* RPC RTT jiffies */
	om_execute = $clnt->cl_metrics->om_execute /* RPC execution jiffies */

	name = "sunrpc.clnt.shutdown_client"
	argstr = sprintf("%s %s %d %d", servname, progname, vers, tasks)
}

probe sunrpc.clnt.shutdown_client.return = 
	kernel.function("rpc_shutdown_client").return ?,
      	module("sunrpc").function("rpc_shutdown_client").return ?
{
	name = "sunrpc.clnt.shutdown_client"
	retstr = returnstr($return)
}

#
# int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, 
# 	int flags)
#
probe sunrpc.clnt.call_sync = kernel.function("rpc_call_sync") ?,
      	module("sunrpc").function("rpc_call_sync") ?
{
	servname = kernel_string($clnt->cl_server)
	progname = kernel_string($clnt->cl_protname)
	prog = prog_from_clnt($clnt)
	vers = vers_from_clnt($clnt)
	prot = prot_from_clnt($clnt)
	port = port_from_clnt($clnt)
	xid  = xid_from_clnt($clnt)
	dead = $clnt->cl_dead

	proc = proc_from_msg($msg)
	procname= $msg->rpc_proc->p_name 
		? kernel_string($msg->rpc_proc->p_name) : "NULL"
	flags = $flags
	
	name = "sunrpc.clnt.call_sync"
	argstr = sprintf("%s %d %s %d %s 0x%x", servname, xid, progname, 
			vers, procname, flags)
}

probe sunrpc.clnt.call_sync.return = kernel.function("rpc_call_sync").return ?,
      	module("sunrpc").function("rpc_call_sync").return ?
{
	name = "sunrpc.clnt.call_sync"
	retstr = returnstr($return)
}

#
# int rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, 
# 	int flags, const struct rpc_call_ops *tk_ops, void *data)
#
probe sunrpc.clnt.call_async = kernel.function("rpc_call_async") ?,
      	module("sunrpc").function("rpc_call_async") ?
{
	servname = kernel_string($clnt->cl_server)
	progname = kernel_string($clnt->cl_protname)
	prog = prog_from_clnt($clnt)
	vers = vers_from_clnt($clnt)
	prot = prot_from_clnt($clnt)
	port = port_from_clnt($clnt)
	xid  = xid_from_clnt($clnt)
	dead = $clnt->cl_dead

	proc = proc_from_msg($msg)
	procname= $msg->rpc_proc->p_name 
		? kernel_string($msg->rpc_proc->p_name) : "NULL"

	flags = $flags
	
	name = "sunrpc.clnt.call_async"
	argstr = sprintf("%s %d %s %d %s 0x%x", servname, xid, progname, 
			vers, procname, flags)
}

probe sunrpc.clnt.call_async.return = 
	kernel.function("rpc_call_async").return ?,
      	module("sunrpc").function("rpc_call_async").return ?
{
	name = "sunrpc.clnt.call_async"
	retstr = returnstr($return)
}

#
# Fires when an (async) RPC call is to be restarted
#
# void rpc_restart_call(struct rpc_task *task)
#
probe sunrpc.clnt.restart_call = kernel.function("rpc_restart_call") ?,
      	module("sunrpc").function("rpc_restart_call") ?
{
	xid = $task->tk_rqstp->rq_xid
	prog = prog_from_clnt($task->tk_client)
	vers = vers_from_clnt($task->tk_client)

	tk_pid = $task->tk_pid
	tk_flags = $task->tk_flags

	name = "sunrpc.clnt.restart_call"
	argstr = sprintf("%d %d %d %d %d", xid, prog, vers, 
			tk_pid, tk_flags)
}

probe sunrpc.clnt.restart_call.return = 
	kernel.function("rpc_restart_call").return ?,
      	module("sunrpc").function("rpc_restart_call").return ?
{
	name = "sunrpc.clnt.restart_call"
}

####################################################################
#                Probe points on RPC server interface              #
####################################################################

probe sunrpc.svc.entry =
	sunrpc.svc.register,
	sunrpc.svc.create,
	sunrpc.svc.destroy,
	sunrpc.svc.process,
	sunrpc.svc.authorise,
	sunrpc.svc.recv,
	sunrpc.svc.send,
	sunrpc.svc.drop
{}

probe sunrpc.svc.return =
	sunrpc.svc.register.return,
	sunrpc.svc.create.return,
	sunrpc.svc.destroy.return,
	sunrpc.svc.process.return,
	sunrpc.svc.authorise.return,
	sunrpc.svc.recv.return,
	sunrpc.svc.send.return,
	sunrpc.svc.drop.return
{}

#
# Fires when an RPC service is to be registered with the local portmapper.
# If proto and port == 0, it means to unregister a service.
#
# int svc_register(struct svc_serv *serv, int proto, unsigned short port)
#
probe sunrpc.svc.register = kernel.function("svc_register") ?,
      	module("sunrpc").function("svc_register") ?
{
	sv_name = kernel_string($serv->sv_name)
	progname = kernel_string($serv->sv_program->pg_name)
	prog = $serv->sv_program->pg_prog
	prot = $proto
	port = $port

	name = "sunrpc.svc.register"
	argstr = sprintf("%s %s %d %d", sv_name, progname, prot, port)
}

probe sunrpc.svc.register.return = kernel.function("svc_register").return ?,
      	module("sunrpc").function("svc_register").return ?
{
	name = "sunrpc.svc.register"
	retstr = returnstr($return)
}

#
# Fires when an RPC service is to be created
#
# struct svc_serv * 
# svc_create(struct svc_program *prog, unsigned int bufsize)
#
probe sunrpc.svc.create = kernel.function("svc_create") ?,
      	module("sunrpc").function("svc_create") ?
{
	pg_name = kernel_string($prog->pg_name)
	pg_prog = $prog->pg_prog
	pg_hivers = $prog->pg_hivers
	pg_nvers  = $prog->pg_nvers
	bufsize = $bufsize
	
	name = "sunrpc.svc.create"
	argstr = sprintf("%s %d %d %d %d", pg_name, pg_prog, 
			pg_hivers, pg_nvers, bufsize)
}

probe sunrpc.svc.create.return = kernel.function("svc_create").return ?,
      	module("sunrpc").function("svc_create").return ?
{
	name = "sunrpc.svc.create"
}

#
# Fires when an RPC service is to be destroyed
#
# void svc_destroy(struct svc_serv *serv)
#
probe sunrpc.svc.destroy = kernel.function("svc_destroy") ?,
      	module("sunrpc").function("svc_destroy") ?
{
	sv_name = kernel_string($serv->sv_name) /* service name */
	sv_progname = kernel_string($serv->sv_program->pg_name)
	sv_prog = $serv->sv_program->pg_prog
	sv_nrthreads = $serv->sv_nrthreads

	/* RPC statistics */
	netcnt = $serv->sv_stats->netcnt
	netcpconn = $serv->sv_stats->nettcpconn
	rpccnt = $serv->sv_stats->rpccnt
	rpcbadclnt = $serv->sv_stats->rpcbadclnt
	
	name = "sunrpc.svc.destroy"
	argstr = sprintf("%s %d %d", sv_name, sv_prog, sv_nrthreads)
}

probe sunrpc.svc.destroy.return = kernel.function("svc_destroy").return ?,
      	module("sunrpc").function("svc_destroy").return ?
{
	name = "sunrpc.svc.destroy"
}

#
# Fires when an RPC request is to be processed
#
# int svc_process(struct svc_serv *serv, struct svc_rqst *rqstp)
#
probe sunrpc.svc.process = kernel.function("svc_process") ?,
      	module("sunrpc").function("svc_process") ?
{
	sv_name = kernel_string($serv->sv_name) /* service name */
	sv_prog = $serv->sv_program->pg_prog

	peer_ip = addr_from_rqst($rqstp)/* peer address */
	rq_xid = $rqstp->rq_xid		/* transmission id */
	rq_prog = $rqstp->rq_prog	/* program number */
	rq_vers = $rqstp->rq_vers	/* program version */
	rq_proc = $rqstp->rq_proc	/* procedure number */
	rq_prot = $rqstp->rq_prot	/* IP protocol */
	
	name = "sunrpc.svc.process"
	argstr = sprintf("%s %d %d %d %d %d %d", sv_name, sv_prog, peer_ip,
			rq_xid, rq_prog, rq_vers, rq_proc)
}

probe sunrpc.svc.process.return = kernel.function("svc_process").return ?,
      	module("sunrpc").function("svc_process").return ?
{
	name = "sunrpc.svc.process"
	retstr = returnstr($return)
}

# 
# int svc_authorise(struct svc_rqst *rqstp)
#
probe sunrpc.svc.authorise = kernel.function("svc_authorise")?,
      	module("sunrpc").function("svc_authorise")?
{
	peer_ip = addr_from_rqst($rqstp)	/* peer address */
	xid  = $rqstp->rq_xid	/* transmission id */
	prog = $rqstp->rq_prog	/* program number */
	vers = $rqstp->rq_vers	/* program version */
	proc = $rqstp->rq_proc	/* procedure number */
	prot = $rqstp->rq_prot	/* IP protocol */

	name = "sunrpc.svc.authorise"
	argstr = sprintf("%d %d %d %d %d %d %d", peer_ip, xid, prog, 
			vers, proc, prot, addr)
}

probe sunrpc.svc.authorise.return = kernel.function("svc_authorise").return ?,
      	module("sunrpc").function("svc_authorise").return ?
{
	name = "sunrpc.svc.authorise"
	retstr = returnstr($return)
}

#
# Fires when receiving the next request on any socket.
#
# int svc_recv(struct svc_serv *serv, struct svc_rqst *rqstp, long timeout)
#
probe sunrpc.svc.recv = kernel.function("svc_recv")?,
      	module("sunrpc").function("svc_recv")?
{
	sv_name = kernel_string($serv->sv_name)	
	timeout = $timeout

	name = "sunrpc.svc.recv"
	argstr = sprintf("%s %d", sv_name, timeout)
}

probe sunrpc.svc.recv.return = kernel.function("svc_recv").return ?,
      	module("sunrpc").function("svc_recv").return ?
{
	name = "sunrpc.svc.recv"
	argstr = returnstr($return)
}

#
# Fires when want to return reply to client.
#
# int svc_send(struct svc_rqst *rqstp)
#
probe sunrpc.svc.send = kernel.function("svc_send")?,
      	module("sunrpc").function("svc_send")?
{
	sv_name = kernel_string($rqstp->rq_server->sv_name)
	sv_prog = $rqstp->rq_server->sv_program->pg_prog

	peer_ip = addr_from_rqst($rqstp) /* peer address */
	xid  = $rqstp->rq_xid	/* transmission id */
	prog = $rqstp->rq_prog	/* program number */
	vers = $rqstp->rq_vers	/* program version */
	proc = $rqstp->rq_proc	/* procedure number */
	prot = $rqstp->rq_prot	/* IP protocol */
	
	name = "sunrpc.svc.send"
	argstr = sprintf("%s %d %d %d %d %d %d %d", sv_name, sv_prog, 
			peer_ip, xid, prog, vers, proc, prot)
}

probe sunrpc.svc.send.return = kernel.function("svc_send").return ?,
      	module("sunrpc").function("svc_send").return ?
{
	name = "sunrpc.svc.send"
	retstr = returnstr($return)
}

#
# Fires when a request is to be dropped
#
# void svc_drop(struct svc_rqst *rqstp)
#
probe sunrpc.svc.drop = kernel.function("svc_drop")?,
      	module("sunrpc").function("svc_drop")?
{
	sv_name = kernel_string($rqstp->rq_server->sv_name)
	sv_prog = $rqstp->rq_server->sv_program->pg_prog

	peer_ip = addr_from_rqst($rqstp) /* peer address */
	xid  = $rqstp->rq_xid	/* transmission id */
	prog = $rqstp->rq_prog	/* program number */
	vers = $rqstp->rq_vers	/* program version */
	proc = $rqstp->rq_proc	/* procedure number */
	prot = $rqstp->rq_prot	/* IP protocol */
	
	name = "sunrpc.svc.drop"
	argstr = sprintf("%s %d %d %d %d %d %d %d", sv_name, sv_prog, 
			peer_ip, xid, prog, vers, proc, prot)
}

probe sunrpc.svc.drop.return = kernel.function("svc_drop").return ?,
      	module("sunrpc").function("svc_drop").return ?
{
	name = "sunrpc.svc.drop"
}

####################################################################
#                   Probe points on RPC scheduler                  #
####################################################################

probe sunrpc.sched.entry =
	sunrpc.sched.new_task,
	sunrpc.sched.execute,
	sunrpc.sched.delay,
	sunrpc.sched.release_task
{}

probe sunrpc.sched.return =
	sunrpc.sched.new_task.return,
	sunrpc.sched.execute.return,
	sunrpc.sched.delay.return,
	sunrpc.sched.release_task.return 
{}

#
# Fires when the RPC `scheduler'(or rather, the finite state machine) 
# is to be executed 
#
# static int __rpc_execute(struct rpc_task *task)
#
probe sunrpc.sched.execute = kernel.function("__rpc_execute") ?,
      	module("sunrpc").function("__rpc_execute") ?
{
	xid = xid_from_clnt($task->tk_client)
	prog = prog_from_clnt($task->tk_client)
	vers = vers_from_clnt($task->tk_client)
	prot = prot_from_clnt($task->tk_client)
	tk_pid = $task->tk_pid
	tk_flags = $task->tk_flags

	name = "sunrpc.sched.execute"
	argstr = sprintf("%d %d %d %d %d %d", xid, prog, 
			vers, prot, tk_pid, tk_flags)
}

probe sunrpc.sched.execute.return = kernel.function("__rpc_execute").return ?,
      	module("sunrpc").function("__rpc_execute").return ?
{
	name = "sunrpc.sched.execute"
	retstr = returnstr($return)
}

#
# Fires when a task is to be delayed
# 
# void rpc_delay(struct rpc_task *task, unsigned long delay)
#
probe sunrpc.sched.delay = kernel.function("rpc_delay") ?,
      module("sunrpc").function("rpc_delay") ?
{
	xid = xid_from_clnt($task->tk_client)
	prog = prog_from_clnt($task->tk_client)
	vers = vers_from_clnt($task->tk_client)
	prot = prot_from_clnt($task->tk_client)
	tk_pid = $task->tk_pid
	tk_flags = $task->tk_flags
	delay = $delay

	name = "sunrpc.clnt.delay"
	argstr = sprintf("%d %d %d %d %d %d", xid, prog, vers, 
			prot, tk_pid, tk_flags)
}

probe sunrpc.sched.delay.return = kernel.function("rpc_delay").return ?,
      module("sunrpc").function("rpc_delay").return ?
{
	name = "sunrpc.clnt.delay"
}

#
# Fires when a new task is to be created for the specified client.
# 
# struct rpc_task * rpc_new_task(struct rpc_clnt *clnt, int flags, 
# 	const struct rpc_call_ops *tk_ops, void *calldata)
#
probe sunrpc.sched.new_task = kernel.function("rpc_new_task") ?,
      	module("sunrpc").function("rpc_new_task") ?
{
	xid = xid_from_clnt($clnt)
	prog = prog_from_clnt($clnt)
	vers = vers_from_clnt($clnt)
	prot = prot_from_clnt($clnt)
	flags  = $flags

	name = "sunrpc.sched.new_task"
	argstr = sprintf("%d %d %d %d %d", xid, prog, vers, prot, flags)
}

probe sunrpc.sched.new_task.return = kernel.function("rpc_new_task").return ?,
      	module("sunrpc").function("rpc_new_task").return ?
{
	name = "sunrpc.sched.new_task"
}

#
# Fires when all resources associated with a task are to be released
# 
# void rpc_release_task(struct rpc_task *task)
#
probe sunrpc.sched.release_task = kernel.function("rpc_release_task") ?,
      	module("sunrpc").function("rpc_release_task") ?
{
	xid = xid_from_clnt($task->tk_client)
	prog = prog_from_clnt($task->tk_client)
	vers = vers_from_clnt($task->tk_client)
	prot = prot_from_clnt($task->tk_client)
	flags  = $task->tk_flags

	name = "sunrpc.sched.release_task"
	argstr = sprintf("%d %d %d %d %d", xid, prog, vers, prot, flags)
}

probe sunrpc.sched.release_task.return = 
	kernel.function("rpc_release_task").return ?,
      	module("sunrpc").function("rpc_release_task").return ?
{
	name = "sunrpc.sched.release_task"
}

####################################################################
#                       Helpler functions                          # 
####################################################################

function xid_from_clnt:long(clnt:long)
%{
	struct rpc_clnt *clnt = (struct rpc_clnt *)THIS->clnt;
	THIS->__retvalue = clnt ? clnt->cl_xprt->tcp_xid : 0;
%}

function prog_from_clnt:long(clnt:long)
%{
	struct rpc_clnt *clnt = (struct rpc_clnt *)THIS->clnt;
	THIS->__retvalue = clnt ? clnt->cl_pmap->pm_prog : 0;
%}

function vers_from_clnt:long(clnt:long)
%{
	struct rpc_clnt *clnt = (struct rpc_clnt *)THIS->clnt;
	THIS->__retvalue = clnt ? clnt->cl_pmap->pm_vers : 0;
%}

function prot_from_clnt:long(clnt:long)
%{
	struct rpc_clnt *clnt = (struct rpc_clnt *)THIS->clnt;
	THIS->__retvalue = clnt ? clnt->cl_pmap->pm_prot : 0;
%}

function port_from_clnt:long(clnt:long)
%{
	struct rpc_clnt *clnt = (struct rpc_clnt *)THIS->clnt;
	THIS->__retvalue = clnt ? clnt->cl_pmap->pm_port : 0;
%}

function tasks_from_clnt:long(clnt:long)
%{
	struct rpc_clnt *clnt = (struct rpc_clnt *)THIS->clnt;
	THIS->__retvalue = atomic_read(&clnt->cl_users);
%}

function proc_from_msg:long(msg:long)
%{
	struct rpc_message *msg = (struct rpc_message *)THIS->msg;
	THIS->__retvalue = msg ? msg->rpc_proc->p_proc : 0;
%}

function vers_from_prog:long(program:long, vers:long)
%{
	struct rpc_program *program = (struct rpc_program *)THIS->program;
	if (!program || THIS->vers >= program->nrvers || !program->version[THIS->vers])
		THIS->__retvalue = 0;
	else
		THIS->__retvalue = program->version[THIS->vers]->number;
%}

function addr_from_rqst:long(rqstp:long)
%{
	struct svc_rqst *rqstp = (struct svc_rqst *)THIS->rqstp;
	THIS->__retvalue = rqstp ? rqstp->rq_addr.sin_addr.s_addr : 0;
%}
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