Patchless supports Linux 3.2.0.

Signed-off-by: Eddie Kohler <[email protected]>

config-linuxmodule.h.in

@@ -15,6 +15,9 @@
 /* Define if your Linux kernel has Click transmit notification extensions. */
 #undef HAVE_CLICK_KERNEL_TX_NOTIFY
 
+/* Define if your Linux kernel has Click skb_recycle. */
+#undef HAVE_CLICK_SKB_RECYCLE
+
 /* Define if fast checksum functions available. */
 #define HAVE_FAST_CHECKSUM 1
 

configure

@@ -11494,6 +11494,63 @@ $as_echo "#define HAVE_SKB_RECYCLE 1" >>confdefs.h
 
     fi
 
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether skb_recycle returns an sk_buff" >&5
+$as_echo_n "checking whether skb_recycle returns an sk_buff... " >&6; }
+if ${ac_cv_linuxmodule_click_skb_recycle+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+	cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#if HAVE_LINUXMODULE_2_6
+# define KBUILD_STR(s)		#s
+# define KBUILD_BASENAME	KBUILD_STR(click)
+# define KBUILD_MODNAME		KBUILD_STR(click)
+#endif
+#define new linux_new
+#define this linux_this
+#define delete linux_delete
+#define class linux_class
+#define virtual linux_virtual
+#define typename linux_typename
+#define private linux_private
+#define protected linux_protected
+#define public linux_public
+#define namespace linux_namespace
+#define false linux_false
+#define true linux_true
+#define CLICK_CXX_PROTECTED 1
+$linux_autoconf_include
+#include <asm/types.h>
+#include <linux/skbuff.h>
+int
+main ()
+{
+extern struct sk_buff *b; b = skb_recycle(b);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_linuxmodule_click_skb_recycle=yes
+else
+  ac_cv_linuxmodule_click_skb_recycle=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_linuxmodule_click_skb_recycle" >&5
+$as_echo "$ac_cv_linuxmodule_click_skb_recycle" >&6; }
+    if test $ac_cv_linuxmodule_click_skb_recycle = yes; then
+
+$as_echo "#define HAVE_CLICK_SKB_RECYCLE 1" >>confdefs.h
+
+    fi
+
     ac_fn_c_check_decl "$LINENO" "skb_linearize" "ac_cv_have_decl_skb_linearize" "#if HAVE_LINUXMODULE_2_6
 # define KBUILD_STR(s)		#s
 # define KBUILD_BASENAME	KBUILD_STR(click)

configure.in

@@ -1440,18 +1440,28 @@ void f1(int64_t) { // will fail if long long and int64_t are the same type
 	AC_DEFINE([HAVE_LINUX_POLLING], [1], [Define if your Linux kernel has polling extensions.])
     fi
 
-    AC_CHECK_DECL(skb_dst_drop, [ac_cv_skb_dst_drop=yes], [ac_cv_skb_dst_drop=no], [CLICK_LINUXMODULE_PROLOGUE()[
+    AC_CHECK_DECL([skb_dst_drop], [ac_cv_skb_dst_drop=yes], [ac_cv_skb_dst_drop=no], [CLICK_LINUXMODULE_PROLOGUE()[
 #include <net/dst.h>]])
     if test $ac_cv_skb_dst_drop = yes; then
 	AC_DEFINE([HAVE_SKB_DST_DROP], [1], [Define if you have the skb_dst_drop function.])
     fi
 
-    AC_CHECK_DECL(skb_recycle, [ac_cv_skb_recycle=yes], [ac_cv_skb_recycle=no], [CLICK_LINUXMODULE_PROLOGUE()[
+    AC_CHECK_DECL([skb_recycle], [ac_cv_skb_recycle=yes], [ac_cv_skb_recycle=no], [CLICK_LINUXMODULE_PROLOGUE()[
 #include <linux/skbuff.h>]])
     if test $ac_cv_skb_recycle = yes; then
 	AC_DEFINE([HAVE_SKB_RECYCLE], [1], [Define if you have the skb_recycle function.])
     fi
 
+    AC_CACHE_CHECK([whether skb_recycle returns an sk_buff], [ac_cv_linuxmodule_click_skb_recycle],
+	[AC_LANG_C
+	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([CLICK_LINUXMODULE_PROLOGUE()[
+#include <linux/skbuff.h>]],
+[[extern struct sk_buff *b; b = skb_recycle(b);]])],
+	[ac_cv_linuxmodule_click_skb_recycle=yes], [ac_cv_linuxmodule_click_skb_recycle=no])])
+    if test $ac_cv_linuxmodule_click_skb_recycle = yes; then
+	AC_DEFINE([HAVE_CLICK_SKB_RECYCLE], [1], [Define if your Linux kernel has Click skb_recycle.])
+    fi
+
     AC_CHECK_DECL(skb_linearize, [ac_cv_skb_linearize=yes], [ac_cv_skb_linearize=no], [CLICK_LINUXMODULE_PROLOGUE()[
 #include <linux/skbuff.h>]])
     if test $ac_cv_skb_linearize = yes; then

elements/linuxmodule/anydevice.hh

@@ -64,7 +64,8 @@ CLICK_CXX_UNPROTECT
 # define SET_STATS(a,b,c)		/* nothing */
 #endif
 
-#if defined(HAVE_NETIF_RECEIVE_SKB) && !(HAVE___NETIF_RECEIVE_SKB || HAVE_NETIF_RECEIVE_SKB_EXTENDED)
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 1, 0) || defined(HAVE_NETIF_RECEIVE_SKB)) \
+	&& !(HAVE___NETIF_RECEIVE_SKB || HAVE_NETIF_RECEIVE_SKB_EXTENDED)
 # define CLICK_DEVICE_UNRECEIVABLE_SK_BUFF 1
 extern "C" {
 DECLARE_PER_CPU(sk_buff *, click_device_unreceivable_sk_buff);

elements/linuxmodule/tohost.cc

@@ -225,7 +225,7 @@ ToHost::push(int port, Packet *p)
     int protocol = (_sniffers ? 0xFFFF : skb->protocol);
 
     // pass packet to Linux
-#ifdef HAVE_NETIF_RECEIVE_SKB /* from Linux headers */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 1, 0) || defined(HAVE_NETIF_RECEIVE_SKB) /* from Linux headers */
     struct net_device *dev = skb->dev;
     local_bh_disable();
     dev_hold(dev);

linuxmodule/clickfs.cc

@@ -132,6 +132,9 @@ unlock_config_write(const char *file, int line)
 #else
 #define INODE_INFO(inode)		(*((ClickInodeInfo *)(&(inode)->u)))
 #endif
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0)
+#define set_nlink(inode, nlink)		((inode)->i_nlink = (nlink))
+#endif
 
 struct ClickInodeInfo {
     uint32_t config_generation;
@@ -154,7 +157,7 @@ inode_out_of_date(struct inode *inode, int subdir_error)
 	if ((error = click_ino.prepare(click_router, click_config_generation)) < 0)
 	    return error;
 	INODE_INFO(inode).config_generation = click_config_generation;
-	inode->i_nlink = click_ino.nlink(inode->i_ino);
+	set_nlink(inode, click_ino.nlink(inode->i_ino));
     }
     return 0;
 }
@@ -185,7 +188,7 @@ click_inode(struct super_block *sb, ino_t ino)
 	    inode->i_gid = click_fsmode.gid;
 	    inode->i_op = click_handler_inode_ops;
 	    inode->i_fop = click_handler_file_ops;
-	    inode->i_nlink = click_ino.nlink(ino);
+	    set_nlink(inode, click_ino.nlink(ino));
 	} else {
 	    // can't happen
 	    iput(inode);
@@ -198,7 +201,7 @@ click_inode(struct super_block *sb, ino_t ino)
 	inode->i_gid = click_fsmode.gid;
 	inode->i_op = click_dir_inode_ops;
 	inode->i_fop = click_dir_file_ops;
-	inode->i_nlink = click_ino.nlink(ino);
+	set_nlink(inode, click_ino.nlink(ino));
     }
 
     inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
@@ -267,7 +270,7 @@ click_dir_revalidate(struct dentry *dentry)
 	    /* preserve error */;
 	else {
 	    INODE_INFO(inode).config_generation = click_config_generation;
-	    inode->i_nlink = click_ino.nlink(inode->i_ino);
+	    set_nlink(inode, click_ino.nlink(inode->i_ino));
 	}
     }
     UNLOCK_CONFIG_READ();

linuxmodule/fixincludes.pl

@@ -247,6 +247,15 @@ ($$)
 		1 while s<void \*\*pslot([^\}]*?)\{><void **____pslot$1\{char **pslot = (char **) ____pslot;>;
 		1 while s<pslot, void \*item([^\}]*?)\{><pslot, void *____item$1\{char *item = (char *) ____item;>;
 	    }
+	    if ($d eq "spinlock_types.h") {
+		s<(typedef\s+struct[^\}]+)(struct\s+__raw_tickets\s+)({[^\}]+})><$2$3;\n$1$2>;
+	    }
+	    if ($d eq "spinlock.h") {
+		s<struct\s+__raw_tickets\s+(\w+)\s*=\s*\{\s*tail:\s*(\S+?)\s*\};><struct __raw_tickets $1 = {}; $1.tail = $2;>;
+	    }
+	    if ($d eq "compiler.h") {
+		s<^#define ACCESS_ONCE\(x\) \(\*\(volatile typeof\(x\) \*\)\&\(x\)\)><#define ACCESS_ONCE(x) (*(typeof(x) * volatile)&(x))>m;
+	    }
 
 	    # CLICK_CXX_PROTECTED check
 	    if (m<\A[\s\200-\377]*\z>) {

linuxmodule/skbmgr.cc

@@ -281,7 +281,7 @@ RecycledSkbPool::recycle(struct sk_buff *skbs)
     struct sk_buff *skb = skbs;
     skbs = skbs->next;
 
-#if HAVE_SKB_RECYCLE
+#if HAVE_CLICK_SKB_RECYCLE
     // where should sk_buff go?
 # if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24)
     unsigned char *skb_end = skb_end_pointer(skb);