15 files changed, 590 insertions, 72 deletions

diff --git a/Documentation/DocBook/kernel-api.tmpl b/Documentation/DocBook/kernel-api.tmpl
index 8c5698a8c2e1..46bcff2849bd 100644
--- a/Documentation/DocBook/kernel-api.tmpl
+++ b/Documentation/DocBook/kernel-api.tmpl
@@ -643,6 +643,60 @@ X!Idrivers/video/console/fonts.c
 !Edrivers/spi/spi.c
   </chapter>
 
+  <chapter id="i2c">
+     <title>I<superscript>2</superscript>C and SMBus Subsystem</title>
+
+     <para>
+        I<superscript>2</superscript>C (or without fancy typography, "I2C")
+        is an acronym for the "Inter-IC" bus, a simple bus protocol which is
+        widely used where low data rate communications suffice.
+        Since it's also a licensed trademark, some vendors use another
+        name (such as "Two-Wire Interface", TWI) for the same bus.
+        I2C only needs two signals (SCL for clock, SDA for data), conserving
+        board real estate and minimizing signal quality issues.
+        Most I2C devices use seven bit addresses, and bus speeds of up
+        to 400 kHz; there's a high speed extension (3.4 MHz) that's not yet
+        found wide use.
+        I2C is a multi-master bus; open drain signaling is used to
+        arbitrate between masters, as well as to handshake and to
+        synchronize clocks from slower clients.
+     </para>
+
+     <para>
+        The Linux I2C programming interfaces support only the master
+        side of bus interactions, not the slave side.
+        The programming interface is structured around two kinds of driver,
+        and two kinds of device.
+        An I2C "Adapter Driver" abstracts the controller hardware; it binds
+        to a physical device (perhaps a PCI device or platform_device) and
+        exposes a <structname>struct i2c_adapter</structname> representing
+        each I2C bus segment it manages.
+        On each I2C bus segment will be I2C devices represented by a
+        <structname>struct i2c_client</structname>.  Those devices will
+        be bound to a <structname>struct i2c_driver</structname>,
+        which should follow the standard Linux driver model.
+        (At this writing, a legacy model is more widely used.)
+        There are functions to perform various I2C protocol operations; at
+        this writing all such functions are usable only from task context.
+     </para>
+
+     <para>
+        The System Management Bus (SMBus) is a sibling protocol.  Most SMBus
+        systems are also I2C conformant.  The electrical constraints are
+        tighter for SMBus, and it standardizes particular protocol messages
+        and idioms.  Controllers that support I2C can also support most
+        SMBus operations, but SMBus controllers don't support all the protocol
+        options that an I2C controller will.
+        There are functions to perform various SMBus protocol operations,
+        either using I2C primitives or by issuing SMBus commands to
+        i2c_adapter devices which don't support those I2C operations.
+     </para>
+
+!Iinclude/linux/i2c.h
+!Fdrivers/i2c/i2c-boardinfo.c i2c_register_board_info
+!Edrivers/i2c/i2c-core.c
+  </chapter>
+
   <chapter id="splice">
       <title>splice API</title>
   <para>)
@@ -654,4 +708,5 @@ X!Idrivers/video/console/fonts.c
 !Ffs/splice.c
   </chapter>
 
+
 </book>
diff --git a/Documentation/blackfin/kgdb.txt b/Documentation/blackfin/kgdb.txt
new file mode 100644
index 000000000000..84f6a484ae9a
--- /dev/null
+++ b/Documentation/blackfin/kgdb.txt
@@ -0,0 +1,155 @@
+                        A Simple Guide to Configure KGDB
+
+                        Sonic Zhang <sonic.zhang@analog.com>
+                                Aug. 24th 2006
+
+
+This KGDB patch enables the kernel developer to do source level debugging on
+the kernel for the Blackfin architecture.  The debugging works over either the
+ethernet interface or one of the uarts.  Both software breakpoints and
+hardware breakpoints are supported in this version.
+http://docs.blackfin.uclinux.org/doku.php?id=kgdb
+
+
+2 known issues:
+1. This bug:
+       http://blackfin.uclinux.org/tracker/index.php?func=detail&aid=544&group_id=18&atid=145
+   The GDB client for Blackfin uClinux causes incorrect values of local
+   variables to be displayed when the user breaks the running of kernel in GDB.
+2. Because of a hardware bug in Blackfin 533 v1.0.3:
+       05000067 - Watchpoints (Hardware Breakpoints) are not supported
+   Hardware breakpoints cannot be set properly.
+
+
+Debug over Ethernet:
+ 
+1. Compile and install the cross platform version of gdb for blackfin, which
+   can be found at $(BINROOT)/bfin-elf-gdb.
+
+2. Apply this patch to the 2.6.x kernel.  Select the menuconfig option under
+   "Kernel hacking" -> "Kernel debugging" -> "KGDB: kernel debug with remote gdb".
+   With this selected, option "Full Symbolic/Source Debugging support" and 
+   "Compile the kernel with frame pointers" are also selected.
+
+3. Select option "KGDB: connect over (Ethernet)".  Add "kgdboe=@target-IP/,@host-IP/" to
+   the option "Compiled-in Kernel Boot Parameter" under "Kernel hacking".
+
+4. Connect minicom to the serial port and boot the kernel image.
+
+5. Configure the IP "/> ifconfig eth0 target-IP"
+
+6. Start GDB client "bfin-elf-gdb vmlinux".
+
+7. Connect to the target "(gdb) target remote udp:target-IP:6443".
+
+8. Set software breakpoint "(gdb) break sys_open".
+
+9. Continue "(gdb) c".
+
+10. Run ls in the target console "/> ls".
+
+11. Breakpoint hits. "Breakpoint 1: sys_open(..."
+
+12. Display local variables and function paramters.
+    (*) This operation gives wrong results, see known issue 1.
+
+13. Single stepping "(gdb) si".
+
+14. Remove breakpoint 1. "(gdb) del 1"
+
+15. Set hardware breakpoint "(gdb) hbreak sys_open".
+
+16. Continue "(gdb) c".
+
+17. Run ls in the target console "/> ls".
+
+18. Hardware breakpoint hits. "Breakpoint 1: sys_open(...".
+    (*) This hardware breakpoint will not be hit, see known issue 2.
+
+19. Continue "(gdb) c".
+
+20. Interrupt the target in GDB "Ctrl+C".
+
+21. Detach from the target "(gdb) detach".
+
+22. Exit GDB "(gdb) quit".
+
+
+Debug over the UART:
+
+1. Compile and install the cross platform version of gdb for blackfin, which
+   can be found at $(BINROOT)/bfin-elf-gdb.
+
+2. Apply this patch to the 2.6.x kernel.  Select the menuconfig option under
+   "Kernel hacking" -> "Kernel debugging" -> "KGDB: kernel debug with remote gdb".
+   With this selected, option "Full Symbolic/Source Debugging support" and 
+   "Compile the kernel with frame pointers" are also selected.
+
+3. Select option "KGDB: connect over (UART)".  Set "KGDB: UART port number" to be
+   a different one from the console.  Don't forget to change the mode of
+   blackfin serial driver to PIO.  Otherwise kgdb works incorrectly on UART.
+ 
+4. If you want connect to kgdb when the kernel boots, enable
+   "KGDB: Wait for gdb connection early" 
+
+5. Compile kernel.
+
+6. Connect minicom to the serial port of the console and boot the kernel image.
+
+7. Start GDB client "bfin-elf-gdb vmlinux".
+
+8. Set the baud rate in GDB "(gdb) set remotebaud 57600".
+
+9. Connect to the target on the second serial port "(gdb) target remote /dev/ttyS1".
+
+10. Set software breakpoint "(gdb) break sys_open".
+
+11. Continue "(gdb) c". 
+
+12. Run ls in the target console "/> ls". 
+
+13. A breakpoint is hit. "Breakpoint 1: sys_open(..."
+
+14. All other operations are the same as that in KGDB over Ethernet. 
+
+
+Debug over the same UART as console:
+
+1. Compile and install the cross platform version of gdb for blackfin, which
+   can be found at $(BINROOT)/bfin-elf-gdb.
+
+2. Apply this patch to the 2.6.x kernel.  Select the menuconfig option under
+   "Kernel hacking" -> "Kernel debugging" -> "KGDB: kernel debug with remote gdb".
+   With this selected, option "Full Symbolic/Source Debugging support" and 
+   "Compile the kernel with frame pointers" are also selected.
+
+3. Select option "KGDB: connect over UART".  Set "KGDB: UART port number" to console.
+   Don't forget to change the mode of blackfin serial driver to PIO.
+   Otherwise kgdb works incorrectly on UART.
+ 
+4. If you want connect to kgdb when the kernel boots, enable
+   "KGDB: Wait for gdb connection early" 
+
+5. Connect minicom to the serial port and boot the kernel image. 
+
+6. (Optional) Ask target to wait for gdb connection by entering Ctrl+A. In minicom, you should enter Ctrl+A+A.
+
+7. Start GDB client "bfin-elf-gdb vmlinux".
+
+8. Set the baud rate in GDB "(gdb) set remotebaud 57600".
+
+9. Connect to the target "(gdb) target remote /dev/ttyS0".
+
+10. Set software breakpoint "(gdb) break sys_open".
+
+11. Continue "(gdb) c". Then enter Ctrl+C twice to stop GDB connection.
+
+12. Run ls in the target console "/> ls". Dummy string can be seen on the console.
+
+13. Then connect the gdb to target again. "(gdb) target remote /dev/ttyS0".
+    Now you will find a breakpoint is hit. "Breakpoint 1: sys_open(..."
+
+14. All other operations are the same as that in KGDB over Ethernet.  The only
+    difference is that after continue command in GDB, please stop GDB
+    connection by 2 "Ctrl+C"s and connect again after breakpoints are hit or
+    Ctrl+A is entered.
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 3a159dac04f5..0599a0c7c026 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -262,25 +262,6 @@ Who:	Richard Purdie <rpurdie@rpsys.net>
 
 ---------------------------
 
-What:   Multipath cached routing support in ipv4
-When:   in 2.6.23
-Why:    Code was merged, then submitter immediately disappeared leaving
-        us with no maintainer and lots of bugs.  The code should not have
-        been merged in the first place, and many aspects of it's
-        implementation are blocking more critical core networking
-        development.  It's marked EXPERIMENTAL and no distribution
-        enables it because it cause obscure crashes due to unfixable bugs
-        (interfaces don't return errors so memory allocation can't be
-        handled, calling contexts of these interfaces make handling
-        errors impossible too because they get called after we've
-        totally commited to creating a route object, for example).
-        This problem has existed for years and no forward progress
-        has ever been made, and nobody steps up to try and salvage
-        this code, so we're going to finally just get rid of it.
-Who:    David S. Miller <davem@davemloft.net>
-
----------------------------
-
 What:   read_dev_chars(), read_conf_data{,_lpm}() (s390 common I/O layer)
 When:   December 2007
 Why:    These functions are a leftover from 2.4 times. They have several
@@ -330,3 +311,18 @@ Who:  Tejun Heo <htejun@gmail.com>
 
 ---------------------------
 
+What:   Legacy RTC drivers (under drivers/i2c/chips)
+When:   November 2007
+Why:    Obsolete. We have a RTC subsystem with better drivers.
+Who:    Jean Delvare <khali@linux-fr.org>
+
+---------------------------
+
+What:   iptables SAME target
+When:   1.1. 2008
+Files:  net/ipv4/netfilter/ipt_SAME.c, include/linux/netfilter_ipv4/ipt_SAME.h
+Why:    Obsolete for multiple years now, NAT core provides the same behaviour.
+        Unfixable broken wrt. 32/64 bit cleanness.
+Who:    Patrick McHardy <kaber@trash.net>
+
+---------------------------
diff --git a/Documentation/i2c/busses/i2c-i801 b/Documentation/i2c/busses/i2c-i801
index c34f0db78a30..fe6406f2f9a6 100644
--- a/Documentation/i2c/busses/i2c-i801
+++ b/Documentation/i2c/busses/i2c-i801
@@ -5,8 +5,8 @@ Supported adapters:
     '810' and '810E' chipsets)
   * Intel 82801BA (ICH2 - part of the '815E' chipset)
   * Intel 82801CA/CAM (ICH3)
-  * Intel 82801DB (ICH4) (HW PEC supported, 32 byte buffer not supported)
-  * Intel 82801EB/ER (ICH5) (HW PEC supported, 32 byte buffer not supported)
+  * Intel 82801DB (ICH4) (HW PEC supported)
+  * Intel 82801EB/ER (ICH5) (HW PEC supported)
   * Intel 6300ESB
   * Intel 82801FB/FR/FW/FRW (ICH6)
   * Intel 82801G (ICH7)
diff --git a/Documentation/i2c/busses/i2c-piix4 b/Documentation/i2c/busses/i2c-piix4
index 7cbe43fa2701..fa0c786a8bf5 100644
--- a/Documentation/i2c/busses/i2c-piix4
+++ b/Documentation/i2c/busses/i2c-piix4
@@ -6,7 +6,7 @@ Supported adapters:
     Datasheet: Publicly available at the Intel website
   * ServerWorks OSB4, CSB5, CSB6 and HT-1000 southbridges
     Datasheet: Only available via NDA from ServerWorks
-  * ATI IXP200, IXP300, IXP400 and SB600 southbridges
+  * ATI IXP200, IXP300, IXP400, SB600 and SB700 southbridges
     Datasheet: Not publicly available
   * Standard Microsystems (SMSC) SLC90E66 (Victory66) southbridge
     Datasheet: Publicly available at the SMSC website http://www.smsc.com
diff --git a/Documentation/i2c/busses/i2c-taos-evm b/Documentation/i2c/busses/i2c-taos-evm
new file mode 100644
index 000000000000..9146e33be6dd
--- /dev/null
+++ b/Documentation/i2c/busses/i2c-taos-evm
@@ -0,0 +1,46 @@
+Kernel driver i2c-taos-evm
+
+Author: Jean Delvare <khali@linux-fr.org>
+
+This is a driver for the evaluation modules for TAOS I2C/SMBus chips.
+The modules include an SMBus master with limited capabilities, which can
+be controlled over the serial port. Virtually all evaluation modules
+are supported, but a few lines of code need to be added for each new
+module to instantiate the right I2C chip on the bus. Obviously, a driver
+for the chip in question is also needed.
+
+Currently supported devices are:
+
+* TAOS TSL2550 EVM
+
+For addtional information on TAOS products, please see
+  http://www.taosinc.com/
+
+
+Using this driver
+-----------------
+
+In order to use this driver, you'll need the serport driver, and the
+inputattach tool, which is part of the input-utils package. The following
+commands will tell the kernel that you have a TAOS EVM on the first
+serial port:
+
+# modprobe serport
+# inputattach --taos-evm /dev/ttyS0
+
+
+Technical details
+-----------------
+
+Only 4 SMBus transaction types are supported by the TAOS evaluation
+modules:
+* Receive Byte
+* Send Byte
+* Read Byte
+* Write Byte
+
+The communication protocol is text-based and pretty simple. It is
+described in a PDF document on the CD which comes with the evaluation
+module. The communication is rather slow, because the serial port has
+to operate at 1200 bps. However, I don't think this is a big concern in
+practice, as these modules are meant for evaluation and testing only.
diff --git a/Documentation/i2c/chips/max6875 b/Documentation/i2c/chips/max6875
index 96fec562a8e9..a0cd8af2f408 100644
--- a/Documentation/i2c/chips/max6875
+++ b/Documentation/i2c/chips/max6875
@@ -99,7 +99,7 @@ And then read the data
 
   or
 
-  count = i2c_smbus_read_i2c_block_data(fd, 0x84, buffer);
+  count = i2c_smbus_read_i2c_block_data(fd, 0x84, 16, buffer);
 
 The block read should read 16 bytes.
 0x84 is the block read command.
diff --git a/Documentation/i2c/chips/x1205 b/Documentation/i2c/chips/x1205
deleted file mode 100644
index 09407c991fe5..000000000000
--- a/Documentation/i2c/chips/x1205
+++ /dev/null
@@ -1,38 +0,0 @@
-Kernel driver x1205
-===================
-
-Supported chips:
-  * Xicor X1205 RTC
-    Prefix: 'x1205'
-    Addresses scanned: none
-    Datasheet: http://www.intersil.com/cda/deviceinfo/0,1477,X1205,00.html
-
-Authors:
-        Karen Spearel <kas11@tampabay.rr.com>,
-        Alessandro Zummo <a.zummo@towertech.it>
-
-Description
------------
-
-This module aims to provide complete access to the Xicor X1205 RTC.
-Recently Xicor has merged with Intersil, but the chip is
-still sold under the Xicor brand.
-
-This chip is located at address 0x6f and uses a 2-byte register addressing.
-Two bytes need to be written to read a single register, while most
-other chips just require one and take the second one as the data
-to be written. To prevent corrupting unknown chips, the user must
-explicitely set the probe parameter.
-
-example:
-
-modprobe x1205 probe=0,0x6f
-
-The module supports one more option, hctosys, which is used to set the
-software clock from the x1205. On systems where the x1205 is the
-only hardware rtc, this parameter could be used to achieve a correct
-date/time earlier in the system boot sequence.
-
-example:
-
-modprobe x1205 probe=0,0x6f hctosys=1
diff --git a/Documentation/i2c/summary b/Documentation/i2c/summary
index aea60bf7e8f0..003c7319b8c7 100644
--- a/Documentation/i2c/summary
+++ b/Documentation/i2c/summary
@@ -67,7 +67,6 @@ i2c-proc: The /proc/sys/dev/sensors interface for device (client) drivers
 Algorithm drivers
 -----------------
 
-i2c-algo-8xx:    An algorithm for CPM's I2C device in Motorola 8xx processors (NOT BUILT BY DEFAULT)
 i2c-algo-bit:    A bit-banging algorithm
 i2c-algo-pcf:    A PCF 8584 style algorithm
 i2c-algo-ibm_ocp: An algorithm for the I2C device in IBM 4xx processors (NOT BUILT BY DEFAULT)
@@ -81,6 +80,5 @@ i2c-pcf-epp:     PCF8584 on a EPP parallel port (uses i2c-algo-pcf) (NOT mkpatch
 i2c-philips-par: Philips style parallel port adapter (uses i2c-algo-bit)
 i2c-adap-ibm_ocp: IBM 4xx processor I2C device (uses i2c-algo-ibm_ocp) (NOT BUILT BY DEFAULT)
 i2c-pport:       Primitive parallel port adapter (uses i2c-algo-bit)
-i2c-rpx:         RPX board Motorola 8xx I2C device (uses i2c-algo-8xx) (NOT BUILT BY DEFAULT)
 i2c-velleman:    Velleman K8000 parallel port adapter (uses i2c-algo-bit)
 
diff --git a/Documentation/i2c/writing-clients b/Documentation/i2c/writing-clients
index 3d8d36b0ad12..2c170032bf37 100644
--- a/Documentation/i2c/writing-clients
+++ b/Documentation/i2c/writing-clients
@@ -571,7 +571,7 @@ SMBus communication
                                         u8 command, u8 length,
                                         u8 *values);
   extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client * client,
-                                           u8 command, u8 *values);
+                                           u8 command, u8 length, u8 *values);
 
 These ones were removed in Linux 2.6.10 because they had no users, but could
 be added back later if needed:
diff --git a/Documentation/i386/zero-page.txt b/Documentation/i386/zero-page.txt
index c04a421f4a7c..75b3680c41eb 100644
--- a/Documentation/i386/zero-page.txt
+++ b/Documentation/i386/zero-page.txt
@@ -37,6 +37,7 @@ Offset	Type		Description
 0x1d0   unsigned long   EFI memory descriptor map pointer
 0x1d4   unsigned long   EFI memory descriptor map size
 0x1e0   unsigned long   ALT_MEM_K, alternative mem check, in Kb
+0x1e4   unsigned long   Scratch field for the kernel setup code
 0x1e8   char            number of entries in E820MAP (below)
 0x1e9   unsigned char   number of entries in EDDBUF (below)
 0x1ea   unsigned char   number of entries in EDD_MBR_SIG_BUFFER (below)
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index af6a63ab9026..09c184e41cf8 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -874,8 +874,7 @@ accept_redirects - BOOLEAN
 accept_source_route - INTEGER
         Accept source routing (routing extension header).
 
-        > 0: Accept routing header.
-        = 0: Accept only routing header type 2.
+        >= 0: Accept only routing header type 2.
         < 0: Do not accept routing header.
 
         Default: 0
diff --git a/Documentation/networking/l2tp.txt b/Documentation/networking/l2tp.txt
new file mode 100644
index 000000000000..2451f551c505
--- /dev/null
+++ b/Documentation/networking/l2tp.txt
@@ -0,0 +1,169 @@
+This brief document describes how to use the kernel's PPPoL2TP driver
+to provide L2TP functionality. L2TP is a protocol that tunnels one or
+more PPP sessions over a UDP tunnel. It is commonly used for VPNs
+(L2TP/IPSec) and by ISPs to tunnel subscriber PPP sessions over an IP
+network infrastructure.
+
+Design
+======
+
+The PPPoL2TP driver, drivers/net/pppol2tp.c, provides a mechanism by
+which PPP frames carried through an L2TP session are passed through
+the kernel's PPP subsystem. The standard PPP daemon, pppd, handles all
+PPP interaction with the peer. PPP network interfaces are created for
+each local PPP endpoint.
+
+The L2TP protocol http://www.faqs.org/rfcs/rfc2661.html defines L2TP
+control and data frames. L2TP control frames carry messages between
+L2TP clients/servers and are used to setup / teardown tunnels and
+sessions. An L2TP client or server is implemented in userspace and
+will use a regular UDP socket per tunnel. L2TP data frames carry PPP
+frames, which may be PPP control or PPP data. The kernel's PPP
+subsystem arranges for PPP control frames to be delivered to pppd,
+while data frames are forwarded as usual.
+
+Each tunnel and session within a tunnel is assigned a unique tunnel_id
+and session_id. These ids are carried in the L2TP header of every
+control and data packet. The pppol2tp driver uses them to lookup
+internal tunnel and/or session contexts. Zero tunnel / session ids are
+treated specially - zero ids are never assigned to tunnels or sessions
+in the network. In the driver, the tunnel context keeps a pointer to
+the tunnel UDP socket. The session context keeps a pointer to the
+PPPoL2TP socket, as well as other data that lets the driver interface
+to the kernel PPP subsystem.
+
+Note that the pppol2tp kernel driver handles only L2TP data frames;
+L2TP control frames are simply passed up to userspace in the UDP
+tunnel socket. The kernel handles all datapath aspects of the
+protocol, including data packet resequencing (if enabled).
+
+There are a number of requirements on the userspace L2TP daemon in
+order to use the pppol2tp driver.
+
+1. Use a UDP socket per tunnel.
+
+2. Create a single PPPoL2TP socket per tunnel bound to a special null
+   session id. This is used only for communicating with the driver but
+   must remain open while the tunnel is active. Opening this tunnel
+   management socket causes the driver to mark the tunnel socket as an
+   L2TP UDP encapsulation socket and flags it for use by the
+   referenced tunnel id. This hooks up the UDP receive path via
+   udp_encap_rcv() in net/ipv4/udp.c. PPP data frames are never passed
+   in this special PPPoX socket.
+
+3. Create a PPPoL2TP socket per L2TP session. This is typically done
+   by starting pppd with the pppol2tp plugin and appropriate
+   arguments. A PPPoL2TP tunnel management socket (Step 2) must be
+   created before the first PPPoL2TP session socket is created.
+
+When creating PPPoL2TP sockets, the application provides information
+to the driver about the socket in a socket connect() call. Source and
+destination tunnel and session ids are provided, as well as the file
+descriptor of a UDP socket. See struct pppol2tp_addr in
+include/linux/if_ppp.h. Note that zero tunnel / session ids are
+treated specially. When creating the per-tunnel PPPoL2TP management
+socket in Step 2 above, zero source and destination session ids are
+specified, which tells the driver to prepare the supplied UDP file
+descriptor for use as an L2TP tunnel socket.
+
+Userspace may control behavior of the tunnel or session using
+setsockopt and ioctl on the PPPoX socket. The following socket
+options are supported:-
+
+DEBUG     - bitmask of debug message categories. See below.
+SENDSEQ   - 0 => don't send packets with sequence numbers
+            1 => send packets with sequence numbers
+RECVSEQ   - 0 => receive packet sequence numbers are optional
+            1 => drop receive packets without sequence numbers
+LNSMODE   - 0 => act as LAC.
+            1 => act as LNS.
+REORDERTO - reorder timeout (in millisecs). If 0, don't try to reorder.
+
+Only the DEBUG option is supported by the special tunnel management
+PPPoX socket.
+
+In addition to the standard PPP ioctls, a PPPIOCGL2TPSTATS is provided
+to retrieve tunnel and session statistics from the kernel using the
+PPPoX socket of the appropriate tunnel or session.
+
+Debugging
+=========
+
+The driver supports a flexible debug scheme where kernel trace
+messages may be optionally enabled per tunnel and per session. Care is
+needed when debugging a live system since the messages are not
+rate-limited and a busy system could be swamped. Userspace uses
+setsockopt on the PPPoX socket to set a debug mask.
+
+The following debug mask bits are available:
+
+PPPOL2TP_MSG_DEBUG    verbose debug (if compiled in)
+PPPOL2TP_MSG_CONTROL  userspace - kernel interface
+PPPOL2TP_MSG_SEQ      sequence numbers handling
+PPPOL2TP_MSG_DATA     data packets
+
+Sample Userspace Code
+=====================
+
+1. Create tunnel management PPPoX socket
+
+        kernel_fd = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP);
+        if (kernel_fd >= 0) {
+                struct sockaddr_pppol2tp sax;
+                struct sockaddr_in const *peer_addr;
+
+                peer_addr = l2tp_tunnel_get_peer_addr(tunnel);
+                memset(&sax, 0, sizeof(sax));
+                sax.sa_family = AF_PPPOX;
+                sax.sa_protocol = PX_PROTO_OL2TP;
+                sax.pppol2tp.fd = udp_fd;       /* fd of tunnel UDP socket */
+                sax.pppol2tp.addr.sin_addr.s_addr = peer_addr->sin_addr.s_addr;
+                sax.pppol2tp.addr.sin_port = peer_addr->sin_port;
+                sax.pppol2tp.addr.sin_family = AF_INET;
+                sax.pppol2tp.s_tunnel = tunnel_id;
+                sax.pppol2tp.s_session = 0;     /* special case: mgmt socket */
+                sax.pppol2tp.d_tunnel = 0;
+                sax.pppol2tp.d_session = 0;     /* special case: mgmt socket */
+
+                if(connect(kernel_fd, (struct sockaddr *)&sax, sizeof(sax) ) < 0 ) {
+                        perror("connect failed");
+                        result = -errno;
+                        goto err;
+                }
+        }
+
+2. Create session PPPoX data socket
+
+        struct sockaddr_pppol2tp sax;
+        int fd;
+
+        /* Note, the target socket must be bound already, else it will not be ready */
+        sax.sa_family = AF_PPPOX;
+        sax.sa_protocol = PX_PROTO_OL2TP;
+        sax.pppol2tp.fd = tunnel_fd;
+        sax.pppol2tp.addr.sin_addr.s_addr = addr->sin_addr.s_addr;
+        sax.pppol2tp.addr.sin_port = addr->sin_port;
+        sax.pppol2tp.addr.sin_family = AF_INET;
+        sax.pppol2tp.s_tunnel  = tunnel_id;
+        sax.pppol2tp.s_session = session_id;
+        sax.pppol2tp.d_tunnel  = peer_tunnel_id;
+        sax.pppol2tp.d_session = peer_session_id;
+
+        /* session_fd is the fd of the session's PPPoL2TP socket.
+         * tunnel_fd is the fd of the tunnel UDP socket.
+         */
+        fd = connect(session_fd, (struct sockaddr *)&sax, sizeof(sax));
+        if (fd < 0 )    {
+                return -errno;
+        }
+        return 0;
+
+Miscellanous
+============
+
+The PPPoL2TP driver was developed as part of the OpenL2TP project by
+Katalix Systems Ltd. OpenL2TP is a full-featured L2TP client / server,
+designed from the ground up to have the L2TP datapath in the
+kernel. The project also implemented the pppol2tp plugin for pppd
+which allows pppd to use the kernel driver. Details can be found at
+http://openl2tp.sourceforge.net.
diff --git a/Documentation/networking/multiqueue.txt b/Documentation/networking/multiqueue.txt
new file mode 100644
index 000000000000..00b60cce2224
--- /dev/null
+++ b/Documentation/networking/multiqueue.txt
@@ -0,0 +1,111 @@
+
+                HOWTO for multiqueue network device support
+                ===========================================
+
+Section 1: Base driver requirements for implementing multiqueue support
+Section 2: Qdisc support for multiqueue devices
+Section 3: Brief howto using PRIO or RR for multiqueue devices
+
+
+Intro: Kernel support for multiqueue devices
+---------------------------------------------------------
+
+Kernel support for multiqueue devices is only an API that is presented to the
+netdevice layer for base drivers to implement.  This feature is part of the
+core networking stack, and all network devices will be running on the
+multiqueue-aware stack.  If a base driver only has one queue, then these
+changes are transparent to that driver.
+
+
+Section 1: Base driver requirements for implementing multiqueue support
+-----------------------------------------------------------------------
+
+Base drivers are required to use the new alloc_etherdev_mq() or
+alloc_netdev_mq() functions to allocate the subqueues for the device.  The
+underlying kernel API will take care of the allocation and deallocation of
+the subqueue memory, as well as netdev configuration of where the queues
+exist in memory.
+
+The base driver will also need to manage the queues as it does the global
+netdev->queue_lock today.  Therefore base drivers should use the
+netif_{start|stop|wake}_subqueue() functions to manage each queue while the
+device is still operational.  netdev->queue_lock is still used when the device
+comes online or when it's completely shut down (unregister_netdev(), etc.).
+
+Finally, the base driver should indicate that it is a multiqueue device.  The
+feature flag NETIF_F_MULTI_QUEUE should be added to the netdev->features
+bitmap on device initialization.  Below is an example from e1000:
+
+#ifdef CONFIG_E1000_MQ
+        if ( (adapter->hw.mac.type == e1000_82571) ||
+             (adapter->hw.mac.type == e1000_82572) ||
+             (adapter->hw.mac.type == e1000_80003es2lan))
+                netdev->features |= NETIF_F_MULTI_QUEUE;
+#endif
+
+
+Section 2: Qdisc support for multiqueue devices
+-----------------------------------------------
+
+Currently two qdiscs support multiqueue devices.  A new round-robin qdisc,
+sch_rr, and sch_prio. The qdisc is responsible for classifying the skb's to
+bands and queues, and will store the queue mapping into skb->queue_mapping.
+Use this field in the base driver to determine which queue to send the skb
+to.
+
+sch_rr has been added for hardware that doesn't want scheduling policies from
+software, so it's a straight round-robin qdisc.  It uses the same syntax and
+classification priomap that sch_prio uses, so it should be intuitive to
+configure for people who've used sch_prio.
+
+The PRIO qdisc naturally plugs into a multiqueue device.  If PRIO has been
+built with NET_SCH_PRIO_MQ, then upon load, it will make sure the number of
+bands requested is equal to the number of queues on the hardware.  If they
+are equal, it sets a one-to-one mapping up between the queues and bands.  If
+they're not equal, it will not load the qdisc.  This is the same behavior
+for RR.  Once the association is made, any skb that is classified will have
+skb->queue_mapping set, which will allow the driver to properly queue skb's
+to multiple queues.
+
+
+Section 3: Brief howto using PRIO and RR for multiqueue devices
+---------------------------------------------------------------
+
+The userspace command 'tc,' part of the iproute2 package, is used to configure
+qdiscs.  To add the PRIO qdisc to your network device, assuming the device is
+called eth0, run the following command:
+
+# tc qdisc add dev eth0 root handle 1: prio bands 4 multiqueue
+
+This will create 4 bands, 0 being highest priority, and associate those bands
+to the queues on your NIC.  Assuming eth0 has 4 Tx queues, the band mapping
+would look like:
+
+band 0 => queue 0
+band 1 => queue 1
+band 2 => queue 2
+band 3 => queue 3
+
+Traffic will begin flowing through each queue if your TOS values are assigning
+traffic across the various bands.  For example, ssh traffic will always try to
+go out band 0 based on TOS -> Linux priority conversion (realtime traffic),
+so it will be sent out queue 0.  ICMP traffic (pings) fall into the "normal"
+traffic classification, which is band 1.  Therefore pings will be send out
+queue 1 on the NIC.
+
+Note the use of the multiqueue keyword.  This is only in versions of iproute2
+that support multiqueue networking devices; if this is omitted when loading
+a qdisc onto a multiqueue device, the qdisc will load and operate the same
+if it were loaded onto a single-queue device (i.e. - sends all traffic to
+queue 0).
+
+Another alternative to multiqueue band allocation can be done by using the
+multiqueue option and specify 0 bands.  If this is the case, the qdisc will
+allocate the number of bands to equal the number of queues that the device
+reports, and bring the qdisc online.
+
+The behavior of tc filters remains the same, where it will override TOS priority
+classification.
+
+
+Author: Peter P. Waskiewicz Jr. <peter.p.waskiewicz.jr@intel.com>
diff --git a/Documentation/networking/netdevices.txt b/Documentation/networking/netdevices.txt
index ce1361f95243..37869295fc70 100644
--- a/Documentation/networking/netdevices.txt
+++ b/Documentation/networking/netdevices.txt
@@ -20,6 +20,30 @@ private data which gets freed when the network device is freed. If
 separately allocated data is attached to the network device
 (dev->priv) then it is up to the module exit handler to free that.
 
+MTU
+===
+Each network device has a Maximum Transfer Unit. The MTU does not
+include any link layer protocol overhead. Upper layer protocols must
+not pass a socket buffer (skb) to a device to transmit with more data
+than the mtu. The MTU does not include link layer header overhead, so
+for example on Ethernet if the standard MTU is 1500 bytes used, the
+actual skb will contain up to 1514 bytes because of the Ethernet
+header. Devices should allow for the 4 byte VLAN header as well.
+
+Segmentation Offload (GSO, TSO) is an exception to this rule.  The
+upper layer protocol may pass a large socket buffer to the device
+transmit routine, and the device will break that up into separate
+packets based on the current MTU.
+
+MTU is symmetrical and applies both to receive and transmit. A device
+must be able to receive at least the maximum size packet allowed by
+the MTU. A network device may use the MTU as mechanism to size receive
+buffers, but the device should allow packets with VLAN header. With
+standard Ethernet mtu of 1500 bytes, the device should allow up to
+1518 byte packets (1500 + 14 header + 4 tag).  The device may either:
+drop, truncate, or pass up oversize packets, but dropping oversize
+packets is preferred.
+
 
 struct net_device synchronization rules
 =======================================
@@ -43,16 +67,17 @@ dev->get_stats:
 
 dev->hard_start_xmit:
         Synchronization: netif_tx_lock spinlock.
+
         When the driver sets NETIF_F_LLTX in dev->features this will be
         called without holding netif_tx_lock. In this case the driver
         has to lock by itself when needed. It is recommended to use a try lock
-        for this and return -1 when the spin lock fails. 
+        for this and return NETDEV_TX_LOCKED when the spin lock fails.
         The locking there should also properly protect against 
-        set_multicast_list
-        Context: Process with BHs disabled or BH (timer).
-        Notes: netif_queue_stopped() is guaranteed false
-               Interrupts must be enabled when calling hard_start_xmit.
-                (Interrupts must also be enabled when enabling the BH handler.)
+        set_multicast_list.
+
+        Context: Process with BHs disabled or BH (timer),
+                 will be called with interrupts disabled by netconsole.
+
         Return codes: 
         o NETDEV_TX_OK everything ok. 
         o NETDEV_TX_BUSY Cannot transmit packet, try later 
@@ -74,4 +99,5 @@ dev->poll:
         Synchronization: __LINK_STATE_RX_SCHED bit in dev->state.  See
                 dev_close code and comments in net/core/dev.c for more info.
         Context: softirq
+                 will be called with interrupts disabled by netconsole.