smp merge first step: changed elements that keep counters to use u_atomic32_t instead

acconfig.h

@@ -8,9 +8,11 @@
 /* Define to 1 since we have Strings. */
 #define HAVE_STRING 1
 
-/* EXPORT_ELEMENT, ELEMENT_REQUIRES and ELEMENT_PROVIDES are noops. */
+/* EXPORT_ELEMENT, ELEMENT_REQUIRES, ELEMENT_MT_SAFE,
+ * and ELEMENT_PROVIDES are noops. */
 #define ELEMENT_REQUIRES(x)
 #define ELEMENT_PROVIDES(x)
+#define ELEMENT_MT_SAFE(x)
 #define EXPORT_ELEMENT(x)
 
 /* Define if <new.h> exists and works. */
@@ -73,6 +75,10 @@
 /* Define if you have -ldl. */
 #undef HAVE_LIBDL
 
+/* Define if click multithread support should be off */
+#undef __MTCLICK__
+#undef __CLICK_NCPUS__
+
 /* Define if you want to use the stride scheduler. */
 #undef HAVE_STRIDE_SCHED
 #ifndef HAVE_STRIDE_SCHED

configure.in

@@ -146,6 +146,24 @@ if test $linuxdir != NONE -a $linuxdir != no -a $enable_linuxmodule = yes; then
 fi
 AC_SUBST(linuxdir)
 
+dnl 
+dnl build with multithread support?
+dnl
+
+AC_ARG_WITH(mt, 
+            [  --with-mt[=MAX_THREADS]      compile with multithread support (max number threads = MAX_THREADS [4])],
+            [mtnt=$withval; if test -z "$withval" -o "$withval" = yes; then mtnt=4; fi; mtsupport=YES],
+            mtsupport=NO)
+
+if test $mtsupport = YES; then
+  AC_DEFINE_UNQUOTED(__CLICK_NCPUS__, $mtnt)
+  AC_DEFINE_UNQUOTED(__MTCLICK__, 1)
+  saveflags="$CPPFLAGS"
+  CPPFLAGS="$saveflags -D__MTCLICK__"
+else
+  AC_DEFINE_UNQUOTED(__CLICK_NCPUS__, 1)
+fi
+
 AC_CACHE_CHECK(whether we are compiling for Linux, ac_cv_under_linux,
   AC_TRY_RUN([int main(int c, char **v) {
 #ifdef __linux__

elements/icmp/checkicmpheader.cc

@@ -40,9 +40,10 @@ const char *CheckICMPHeader::reason_texts[NREASONS] = {
 };
 
 CheckICMPHeader::CheckICMPHeader()
-  : Element(1, 1), _drops(0), _reason_drops(0)
+  : Element(1, 1), _reason_drops(0)
 {
   MOD_INC_USE_COUNT;
+  _drops = 0;
 }
 
 CheckICMPHeader::~CheckICMPHeader()
@@ -72,11 +73,12 @@ CheckICMPHeader::configure(const Vector<String> &conf, ErrorHandler *errh)
   
   _verbose = verbose;
   if (details)
-    _reason_drops = new int[NREASONS];
+    _reason_drops = new u_atomic32_t[NREASONS];
   
   return 0;
 }
 
+
 Packet *
 CheckICMPHeader::drop(Reason reason, Packet *p)
 {

elements/icmp/checkicmpheader.hh

@@ -46,7 +46,7 @@ subdivided by error. Only available if the DETAILS keyword argument was true.
 =a CheckIPHeader, CheckUDPHeader, MarkIPHeader */
 
 #include <click/element.hh>
-#include <click/glue.hh>
+#include <click/atomic.hh>
 
 class CheckICMPHeader : public Element { public:
   
@@ -66,8 +66,8 @@ class CheckICMPHeader : public Element { public:
  private:
   
   bool _verbose : 1;
-  int _drops;
-  int *_reason_drops;
+  u_atomic32_t _drops;
+  u_atomic32_t *_reason_drops;
 
   enum Reason {
     NOT_ICMP,

elements/icmp/icmperror.cc

@@ -259,3 +259,5 @@ ICMPError::simple_action(Packet *p)
 }
 
 EXPORT_ELEMENT(ICMPError)
+ELEMENT_MT_SAFE(ICMPError)
+

elements/icmp/icmppingresponder.cc

@@ -82,3 +82,4 @@ ICMPPingResponder::simple_action(Packet *p_in)
 }
 
 EXPORT_ELEMENT(ICMPPingResponder)
+ELEMENT_MT_SAFE(ICMPPingResponder)

elements/icmp/icmpsendpings.cc

@@ -105,3 +105,4 @@ ICMPSendPings::run_scheduled()
 }
 
 EXPORT_ELEMENT(ICMPSendPings)
+

elements/ip/checkipheader.cc

@@ -41,11 +41,12 @@ const char *CheckIPHeader::reason_texts[NREASONS] = {
 };
 
 CheckIPHeader::CheckIPHeader()
-  : _bad_src(0), _drops(0), _reason_drops(0)
+  : _bad_src(0), _reason_drops(0)
 {
   MOD_INC_USE_COUNT;
   add_input();
   add_output();
+  _drops = 0;
 }
 
 CheckIPHeader::~CheckIPHeader()
@@ -93,7 +94,7 @@ CheckIPHeader::configure(const Vector<String> &conf, ErrorHandler *errh)
 
   _verbose = verbose;
   if (details)
-    _reason_drops = new int[NREASONS];
+    _reason_drops = new u_atomic32_t[NREASONS];
 
 #ifdef __KERNEL__
   // check alignment

elements/ip/checkipheader.hh

@@ -58,7 +58,7 @@ subdivided by error. Only available if the DETAILS keyword argument was true.
 =a CheckIPHeader2, MarkIPHeader, SetIPChecksum, StripIPHeader */
 
 #include <click/element.hh>
-#include <click/glue.hh>
+#include <click/atomic.hh>
 
 class CheckIPHeader : public Element { public:
 
@@ -84,8 +84,8 @@ class CheckIPHeader : public Element { public:
   bool _aligned : 1;
 #endif
   bool _verbose : 1;
-  int _drops;
-  int *_reason_drops;
+  u_atomic32_t _drops;
+  u_atomic32_t *_reason_drops;
 
   enum Reason {
     MINISCULE_PACKET,

elements/ip/checkipheader2.cc

@@ -76,7 +76,7 @@ CheckIPHeader2::configure(const Vector<String> &conf, ErrorHandler *errh)
   
   _verbose = verbose;
   if (details)
-    _reason_drops = new int[NREASONS];
+    _reason_drops = new u_atomic32_t[NREASONS];
 
   return 0;
 }

elements/ip/decipttl.cc

@@ -27,11 +27,10 @@
 #include <click/glue.hh>
 
 DecIPTTL::DecIPTTL()
-  : _drops(0)
+  : Element(1, 1)
 {
   MOD_INC_USE_COUNT;
-  add_input();
-  add_output();
+  _drops = 0;
 }
 
 DecIPTTL::~DecIPTTL()
@@ -105,3 +104,5 @@ DecIPTTL::add_handlers()
 }
 
 EXPORT_ELEMENT(DecIPTTL)
+ELEMENT_MT_SAFE(DecIPTTL)
+

elements/ip/decipttl.hh

@@ -27,13 +27,10 @@
 
 #include <click/element.hh>
 #include <click/glue.hh>
+#include <click/atomic.hh>
 
-class DecIPTTL : public Element {
+class DecIPTTL : public Element { public:
 
-  int _drops;
-  
- public:
-  
   DecIPTTL();
   ~DecIPTTL();
   
@@ -41,7 +38,7 @@ class DecIPTTL : public Element {
   const char *processing() const		{ return "a/ah"; }
   void notify_noutputs(int);
   
-  int drops()					{ return _drops; }
+  u_int32_t drops()				{ return _drops; }
   
   DecIPTTL *clone() const;
   void add_handlers();
@@ -49,6 +46,10 @@ class DecIPTTL : public Element {
   Packet *simple_action(Packet *);
   void drop_it(Packet *);
   
+ private:
+
+  u_atomic32_t _drops;
+  
 };
 
 #endif

elements/ip/fixipsrc.cc

@@ -66,9 +66,11 @@ FixIPSrc::fix_it(Packet *p_in)
   WritablePacket *p = p_in->uniqueify();
   click_ip *ip = p->ip_header();
   SET_FIX_IP_SRC_ANNO(p, 0);
+#if 0
   click_chatter("FixIPSrc changed %x to %x",
                 ip->ip_src.s_addr,
                 _my_ip.s_addr);
+#endif
   ip->ip_src = _my_ip;
   int hlen = ip->ip_hl << 2;
   ip->ip_sum = 0;
@@ -86,3 +88,5 @@ FixIPSrc::simple_action(Packet *p)
 }
 
 EXPORT_ELEMENT(FixIPSrc)
+ELEMENT_MT_SAFE(FixIPSrc)
+

elements/ip/getipaddress.cc

@@ -55,3 +55,5 @@ GetIPAddress::simple_action(Packet *p)
 }
 
 EXPORT_ELEMENT(GetIPAddress)
+ELEMENT_MT_SAFE(GetIPAddress)
+

elements/ip/ipclassifier.cc

@@ -57,3 +57,5 @@ IPClassifier::configure(const Vector<String> &conf, ErrorHandler *errh)
 
 ELEMENT_REQUIRES(Classifier)
 EXPORT_ELEMENT(IPClassifier)
+ELEMENT_MT_SAFE(IPClassifier)
+

elements/ip/ipencap.cc

@@ -90,7 +90,7 @@ IPEncap::simple_action(Packet *p_in)
   ip->ip_v = 4;
   ip->ip_hl = sizeof(click_ip) >> 2;
   ip->ip_len = htons(p->length());
-  ip->ip_id = htons(_id++);
+  ip->ip_id = htons(_id.read_and_add(1));
   ip->ip_p = _ip_p;
   ip->ip_src = _ip_src;
   ip->ip_dst = _ip_dst;
@@ -116,3 +116,5 @@ IPEncap::simple_action(Packet *p_in)
 }
 
 EXPORT_ELEMENT(IPEncap)
+ELEMENT_MT_SAFE(IPEncap)
+

elements/ip/ipencap.hh

@@ -28,6 +28,7 @@
 
 #include <click/element.hh>
 #include <click/glue.hh>
+#include <click/atomic.hh>
 #include <click/click_ip.h>
 
 class IPEncap : public Element {
@@ -39,7 +40,7 @@ class IPEncap : public Element {
   bool _aligned;
 #endif
 
-  short _id;
+  u_atomic32_t _id;
 
  public:
   

elements/ip/ipfragmenter.cc

@@ -29,11 +29,11 @@
 #include <click/glue.hh>
 
 IPFragmenter::IPFragmenter()
-  : _drops(0)
 {
   MOD_INC_USE_COUNT;
   _fragments = 0;
   _mtu = 0;
+  _drops = 0;
   add_input();
   add_output();
 }
@@ -206,3 +206,5 @@ IPFragmenter::add_handlers()
 
 
 EXPORT_ELEMENT(IPFragmenter)
+ELEMENT_MT_SAFE(IPFragmenter)
+

elements/ip/ipfragmenter.hh

@@ -29,12 +29,13 @@
 
 #include <click/element.hh>
 #include <click/glue.hh>
+#include <click/atomic.hh>
 
 class IPFragmenter : public Element {
 
   unsigned _mtu;
-  int _drops;
-  int _fragments;
+  u_atomic32_t _drops;
+  u_atomic32_t _fragments;
 
   void fragment(Packet *);
   int optcopy(const click_ip *ip1, click_ip *ip2);
@@ -49,8 +50,8 @@ class IPFragmenter : public Element {
   void notify_noutputs(int);
   int configure(const Vector<String> &, ErrorHandler *);
   
-  int drops() const				{ return _drops; }
-  int fragments() const				{ return _fragments; }
+  u_int32_t drops() const			{ return _drops; }
+  u_int32_t fragments() const			{ return _fragments; }
   
   IPFragmenter *clone() const;
   void add_handlers();

elements/ip/ipgwoptions.cc

@@ -227,3 +227,5 @@ IPGWOptions::add_handlers()
 }
 
 EXPORT_ELEMENT(IPGWOptions)
+ELEMENT_MT_SAFE(IPGWOptions)
+

elements/ip/ipgwoptions.hh

@@ -31,10 +31,11 @@
 
 #include <click/element.hh>
 #include <click/glue.hh>
+#include <click/atomic.hh>
 
 class IPGWOptions : public Element {
   
-  int _drops;
+  u_atomic32_t _drops;
   struct in_addr _my_ip;
   unsigned *_other_ips;
   int _n_other_ips;
@@ -51,7 +52,7 @@ class IPGWOptions : public Element {
   IPGWOptions *clone() const;
   void add_handlers();
 
-  int drops() { return(_drops); }
+  u_int32_t drops() const			{ return _drops; }
   
   Packet *handle_options(Packet *);
   Packet *simple_action(Packet *);

elements/ip/ipinputcombo.cc

@@ -32,9 +32,10 @@
 #include "elements/standard/alignmentinfo.hh"
 
 IPInputCombo::IPInputCombo()
-  : _drops(0), _bad_src(0)
+  : _bad_src(0)
 {
   MOD_INC_USE_COUNT;
+  _drops = 0;
   add_input();
   add_output();
 }
@@ -189,3 +190,5 @@ IPInputCombo::add_handlers()
 }
 
 EXPORT_ELEMENT(IPInputCombo)
+ELEMENT_MT_SAFE(IPInputCombo)
+

elements/ip/ipinputcombo.hh

@@ -23,10 +23,11 @@
 
 #include <click/element.hh>
 #include <click/glue.hh>
+#include <click/atomic.hh>
 
 class IPInputCombo : public Element {
   
-  int _drops;
+  u_atomic32_t _drops;
   int _color;
 
   int _n_bad_src;
@@ -43,7 +44,7 @@ class IPInputCombo : public Element {
   const char *class_name() const		{ return "IPInputCombo"; }
   const char *processing() const		{ return AGNOSTIC; }
   
-  int drops() const				{ return _drops; }
+  u_int32_t drops() const			{ return _drops; }
   IPInputCombo *clone() const;
   void add_handlers();
   int configure(const Vector<String> &, ErrorHandler *);

elements/ip/ipmirror.cc

@@ -60,3 +60,5 @@ IPMirror::simple_action(Packet *p_in)
 }
 
 EXPORT_ELEMENT(IPMirror)
+ELEMENT_MT_SAFE(IPMirror)
+

elements/ip/ipoutputcombo.cc

@@ -209,3 +209,5 @@ IPOutputCombo::push(int, Packet *p_in)
 }
 
 EXPORT_ELEMENT(IPOutputCombo)
+ELEMENT_MT_SAFE(IPOutputCombo)
+

elements/ip/ipratemon.cc

@@ -29,7 +29,7 @@
 #include <click/straccum.hh>
 #include <click/error.hh>
 #include <click/glue.hh>
-#include <click/mplock.hh>
+#include <click/sync.hh>
 #include <click/llrpc.h>
 
 IPRateMonitor::IPRateMonitor()

elements/ip/iprw.cc

@@ -366,11 +366,17 @@ IPRw::Pattern::create_mapping(int ip_p, const IPFlowID &in,
 			      int fport, int rport,
 			      Mapping *fmap, Mapping *rmap)
 {
+  static unsigned _printed = 0;
   unsigned short new_sport = 0;
   if (_sportl) {
     new_sport = find_sport();
-    if (!new_sport)
+    if (!new_sport) {
+      if (!_printed) { 
+	click_chatter("IPRw ran out of ports");
+	_printed = 1;
+      }
       return false;
+    }
   }
   
   IPFlowID out(in);

elements/ip/lookupiproutemp.cc

+/*
+ * lookupiproutemp.{cc,hh} -- element looks up next-hop address in static
+ * routing table, has processor local cache in SMP mode.
+ * Robert Morris
+ *
+ * Copyright (c) 1999-2000 Massachusetts Institute of Technology
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * Further elaboration of this license, including a DISCLAIMER OF ANY
+ * WARRANTY, EXPRESS OR IMPLIED, is provided in the LICENSE file, which is
+ * also accessible at http://www.pdos.lcs.mit.edu/click/license.html
+ */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+#include <click/config.h>
+#include <click/package.hh>
+#include "lookupiproutemp.hh"
+#include <click/ipaddress.hh>
+#include <click/confparse.hh>
+#include <click/error.hh>
+#include <click/glue.hh>
+
+LookupIPRouteMP::LookupIPRouteMP()
+{
+  MOD_INC_USE_COUNT;
+  add_input();
+}
+
+LookupIPRouteMP::~LookupIPRouteMP()
+{
+  MOD_DEC_USE_COUNT;
+}
+
+LookupIPRouteMP *
+LookupIPRouteMP::clone() const
+{
+  return new LookupIPRouteMP;
+}
+
+int
+LookupIPRouteMP::configure(const Vector<String> &conf, ErrorHandler *errh)
+{
+  int maxout = -1;
+  _t.clear();
+  
+  int before = errh->nerrors();
+  for (int i = 0; i < conf.size(); i++) {
+    unsigned int dst, mask, gw;
+    int output_num;
+    bool ok = false;
+
+    Vector<String> words;
+    cp_spacevec(conf[i], words);
+    
+    if ((words.size() == 2 || words.size() == 3)
+	&& cp_ip_prefix(words[0], (unsigned char *)&dst, (unsigned char *)&mask, true, this) // allow base IP addresses
+	&& cp_integer(words.back(), &output_num)) {
+      if (words.size() == 3)
+	ok = cp_ip_address(words[1], (unsigned char *)&gw, this);
+      else
+	ok = true;
+    }
+
+    if (ok && output_num >= 0) {
+      _t.add(dst, mask, gw, output_num);
+      if (output_num > maxout)
+        maxout = output_num;
+    } else
+      errh->error("argument %d should be `DADDR/MASK [GATEWAY] OUTPUT'", i+1);
+  }
+  if (errh->nerrors() != before)
+    return -1;
+  if (maxout < 0)
+    errh->warning("no routes");
+
+  set_noutputs(maxout + 1);
+  return 0;
+}
+
+int
+LookupIPRouteMP::initialize(ErrorHandler *)
+{
+  click_chatter("LookupIPRouteMP alignment: %p, %p", 
+                &(_cache[0]._last_addr_1), &(_cache[1]._last_addr_1));
+  for (int i=0; i<_cache_buckets; i++) {
+    _cache[i]._last_addr_1 = IPAddress();
+    _cache[i]._last_addr_2 = IPAddress();
+  }
+  return 0;
+}
+
+#ifdef __KERNEL__
+extern "C" {
+#include <linux/sched.h>
+}
+#endif
+
+void
+LookupIPRouteMP::push(int, Packet *p)
+{
+  IPAddress a = p->dst_ip_anno();
+  unsigned gw = 0;
+  int ifi = -1;
+#ifdef __KERNEL__
+  int bucket = current->processor % _cache_buckets;
+#else
+  int bucket = 0;
+#endif
+
+  if (a) {
+    if (a == _cache[bucket]._last_addr_1) {
+      if (_cache[bucket]._last_gw_1)
+	p->set_dst_ip_anno(_cache[bucket]._last_gw_1);
+      output(_cache[bucket]._last_output_1).push(p);
+      return;
+    } 
+    else if (a == _cache[bucket]._last_addr_2) {
+      if (_cache[bucket]._last_gw_2)
+	p->set_dst_ip_anno(_cache[bucket]._last_gw_2);
+      output(_cache[bucket]._last_output_2).push(p);
+      return;
+    } 
+  }
+  
+  if (_t.lookup(a.addr(), gw, ifi) == true) {
+    _cache[bucket]._last_addr_2 = _cache[bucket]._last_addr_1;
+    _cache[bucket]._last_gw_2 = _cache[bucket]._last_gw_1;
+    _cache[bucket]._last_output_2 = _cache[bucket]._last_output_1;
+    _cache[bucket]._last_addr_1 = a;
+    _cache[bucket]._last_gw_1 = gw;
+    _cache[bucket]._last_output_1 = ifi;
+    if (gw != 0)
+      p->set_dst_ip_anno(IPAddress(gw));
+    output(ifi).push(p);
+  } else {
+    click_chatter("LookupIPRouteMP: no gw for %x", a.addr());
+    p->kill();
+  }
+}
+
+EXPORT_ELEMENT(LookupIPRouteMP)

elements/ip/lookupiproutemp.hh

+#ifndef LOOKUPIPROUTEMP_HH
+#define LOOKUPIPROUTEMP_HH
+
+/*
+ * =c
+ * LookupIPRouteMP(DST1/MASK1 [GW1] OUT1, DST2/MASK2 [GW2] OUT2, ...)
+ * =s
+ * simple static IP routing table
+ * V<classification>
+ * =d
+ * Interfaces are exactly the same as LookupIPRoute. The only difference is
+ * when operating in SMP mode, each processor has a processor local cache,
+ * hence the element is MT SAFE.
+ *
+ * =a LookupIPRoute
+ */
+
+#include <click/element.hh>
+#include <click/iptable.hh>
+
+class LookupIPRouteMP : public Element {
+#ifdef __KERNEL__
+  static const int _cache_buckets = NR_CPUS;
+#else
+  static const int _cache_buckets = 1;
+#endif
+ 
+  // XXX a bit annoying that we don't get better alignment =(
+  int _pad[2];
+  struct {
+    IPAddress _last_addr_1;
+    IPAddress _last_gw_1;
+    int _last_output_1;
+    IPAddress _last_addr_2;
+    IPAddress _last_gw_2;
+    int _last_output_2;
+    int pad[2];
+  } _cache[_cache_buckets];
+
+  IPTable _t;
+
+public:
+  LookupIPRouteMP();
+  ~LookupIPRouteMP();
+  
+  const char *class_name() const		{ return "LookupIPRouteMP"; }
+  const char *processing() const		{ return AGNOSTIC; }
+  LookupIPRouteMP *clone() const;
+  
+  int configure(const Vector<String> &, ErrorHandler *);
+  int initialize(ErrorHandler *);
+
+  void push(int port, Packet *p);
+};
+
+#endif

elements/ip/markipheader.cc

@@ -62,3 +62,5 @@ MarkIPHeader::simple_action(Packet *p)
 }
 
 EXPORT_ELEMENT(MarkIPHeader)
+ELEMENT_MT_SAFE(MarkIPHeader)
+

elements/ip/saveipfields.cc

@@ -58,3 +58,5 @@ SaveIPFields::simple_action(Packet *p)
 
 ELEMENT_REQUIRES(false)
 EXPORT_ELEMENT(SaveIPFields)
+ELEMENT_MT_SAFE(SaveIPFields)
+

elements/ip/setipaddress.cc

@@ -53,3 +53,5 @@ SetIPAddress::simple_action(Packet *p)
 }
 
 EXPORT_ELEMENT(SetIPAddress)
+ELEMENT_MT_SAFE(SetIPAddress)
+

elements/ip/setipchecksum.cc

@@ -70,3 +70,5 @@ SetIPChecksum::simple_action(Packet *p_in)
 }
 
 EXPORT_ELEMENT(SetIPChecksum)
+ELEMENT_MT_SAFE(SetIPChecksum)
+

elements/ip/setipdscp.cc

@@ -111,3 +111,5 @@ SetIPDSCP::add_handlers()
 }
 
 EXPORT_ELEMENT(SetIPDSCP)
+ELEMENT_MT_SAFE(SetIPDSCP)
+

elements/ip/storeipaddress.cc

@@ -59,3 +59,5 @@ StoreIPAddress::simple_action(Packet *p)
 }
 
 EXPORT_ELEMENT(StoreIPAddress)
+ELEMENT_MT_SAFE(StoreIPAddress)
+

elements/ip/stripipheader.cc

@@ -44,3 +44,5 @@ StripIPHeader::simple_action(Packet *p)
 }
 
 EXPORT_ELEMENT(StripIPHeader)
+ELEMENT_MT_SAFE(StripIPHeader)
+

elements/ip/unstripipheader.cc

@@ -46,3 +46,4 @@ UnstripIPHeader::simple_action(Packet *p)
 }
 
 EXPORT_ELEMENT(UnstripIPHeader)
+ELEMENT_MT_SAFE(UnstripIPHeader)

elements/linuxmodule/cpuswitch.cc

+/*
+ * Copyright (c) 1999-2000 Massachusetts Institute of Technology
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * Further elaboration of this license, including a DISCLAIMER OF ANY
+ * WARRANTY, EXPRESS OR IMPLIED, is provided in the LICENSE file, which is
+ * also accessible at http://www.pdos.lcs.mit.edu/click/license.html
+ */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+#include <click/config.h>
+#include <click/package.hh>
+#include "cpuswitch.hh"
+#include <click/error.hh>
+#include <click/confparse.hh>
+
+CPUSwitch::CPUSwitch()
+{
+  MOD_INC_USE_COUNT;
+  set_ninputs(1);
+}
+
+CPUSwitch::~CPUSwitch()
+{
+  MOD_DEC_USE_COUNT;
+}