Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

Pull networking updates from David Miller:
 "Highlights (1721 non-merge commits, this has to be a record of some
  sort):

   1) Add 'random' mode to team driver, from Jiri Pirko and Eric
      Dumazet.

   2) Make it so that any driver that supports configuration of multiple
      MAC addresses can provide the forwarding database add and del
      calls by providing a default implementation and hooking that up if
      the driver doesn't have an explicit set of handlers.  From Vlad
      Yasevich.

   3) Support GSO segmentation over tunnels and other encapsulating
      devices such as VXLAN, from Pravin B Shelar.

   4) Support L2 GRE tunnels in the flow dissector, from Michael Dalton.

   5) Implement Tail Loss Probe (TLP) detection in TCP, from Nandita
      Dukkipati.

   6) In the PHY layer, allow supporting wake-on-lan in situations where
      the PHY registers have to be written for it to be configured.

      Use it to support wake-on-lan in mv643xx_eth.

      From Michael Stapelberg.

   7) Significantly improve firewire IPV6 support, from YOSHIFUJI
      Hideaki.

   8) Allow multiple packets to be sent in a single transmission using
      network coding in batman-adv, from Martin Hundebøll.

   9) Add support for T5 cxgb4 chips, from Santosh Rastapur.

  10) Generalize the VXLAN forwarding tables so that there is more
      flexibility in configurating various aspects of the endpoints.
      From David Stevens.

  11) Support RSS and TSO in hardware over GRE tunnels in bxn2x driver,
      from Dmitry Kravkov.

  12) Zero copy support in nfnelink_queue, from Eric Dumazet and Pablo
      Neira Ayuso.

  13) Start adding networking selftests.

  14) In situations of overload on the same AF_PACKET fanout socket, or
      per-cpu packet receive queue, minimize drop by distributing the
      load to other cpus/fanouts.  From Willem de Bruijn and Eric
      Dumazet.

  15) Add support for new payload offset BPF instruction, from Daniel
      Borkmann.

  16) Convert several drivers over to mdoule_platform_driver(), from
      Sachin Kamat.

  17) Provide a minimal BPF JIT image disassembler userspace tool, from
      Daniel Borkmann.

  18) Rewrite F-RTO implementation in TCP to match the final
      specification of it in RFC4138 and RFC5682.  From Yuchung Cheng.

  19) Provide netlink socket diag of netlink sockets ("Yo dawg, I hear
      you like netlink, so I implemented netlink dumping of netlink
      sockets.") From Andrey Vagin.

  20) Remove ugly passing of rtnetlink attributes into rtnl_doit
      functions, from Thomas Graf.

  21) Allow userspace to be able to see if a configuration change occurs
      in the middle of an address or device list dump, from Nicolas
      Dichtel.

  22) Support RFC3168 ECN protection for ipv6 fragments, from Hannes
      Frederic Sowa.

  23) Increase accuracy of packet length used by packet scheduler, from
      Jason Wang.

  24) Beginning set of changes to make ipv4/ipv6 fragment handling more
      scalable and less susceptible to overload and locking contention,
      from Jesper Dangaard Brouer.

  25) Get rid of using non-type-safe NLMSG_* macros and use nlmsg_*()
      instead.  From Hong Zhiguo.

  26) Optimize route usage in IPVS by avoiding reference counting where
      possible, from Julian Anastasov.

  27) Convert IPVS schedulers to RCU, also from Julian Anastasov.

  28) Support cpu fanouts in xt_NFQUEUE netfilter target, from Holger
      Eitzenberger.

  29) Network namespace support for nf_log, ebt_log, xt_LOG, ipt_ULOG,
      nfnetlink_log, and nfnetlink_queue.  From Gao feng.

  30) Implement RFC3168 ECN protection, from Hannes Frederic Sowa.

  31) Support several new r8169 chips, from Hayes Wang.

  32) Support tokenized interface identifiers in ipv6, from Daniel
      Borkmann.

  33) Use usbnet_link_change() helper in USB net driver, from Ming Lei.

  34) Add 802.1ad vlan offload support, from Patrick McHardy.

  35) Support mmap() based netlink communication, also from Patrick
      McHardy.

  36) Support HW timestamping in mlx4 driver, from Amir Vadai.

  37) Rationalize AF_PACKET packet timestamping when transmitting, from
      Willem de Bruijn and Daniel Borkmann.

  38) Bring parity to what's provided by /proc/net/packet socket dumping
      and the info provided by netlink socket dumping of AF_PACKET
      sockets.  From Nicolas Dichtel.

  39) Fix peeking beyond zero sized SKBs in AF_UNIX, from Benjamin
      Poirier"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1722 commits)
  filter: fix va_list build error
  af_unix: fix a fatal race with bit fields
  bnx2x: Prevent memory leak when cnic is absent
  bnx2x: correct reading of speed capabilities
  net: sctp: attribute printl with __printf for gcc fmt checks
  netlink: kconfig: move mmap i/o into netlink kconfig
  netpoll: convert mutex into a semaphore
  netlink: Fix skb ref counting.
  net_sched: act_ipt forward compat with xtables
  mlx4_en: fix a build error on 32bit arches
  Revert "bnx2x: allow nvram test to run when device is down"
  bridge: avoid OOPS if root port not found
  drivers: net: cpsw: fix kernel warn on cpsw irq enable
  sh_eth: use random MAC address if no valid one supplied
  3c509.c: call SET_NETDEV_DEV for all device types (ISA/ISAPnP/EISA)
  tg3: fix to append hardware time stamping flags
  unix/stream: fix peeking with an offset larger than data in queue
  unix/dgram: fix peeking with an offset larger than data in queue
  unix/dgram: peek beyond 0-sized skbs
  openvswitch: Remove unneeded ovs_netdev_get_ifindex()
  ...

14 files changed, 924 insertions, 60 deletions

diff --git a/Documentation/ABI/testing/sysfs-class-net-mesh b/Documentation/ABI/testing/sysfs-class-net-mesh
index bc41da6..bdcd8b4 100644
--- a/Documentation/ABI/testing/sysfs-class-net-mesh
+++ b/Documentation/ABI/testing/sysfs-class-net-mesh
@@ -67,6 +67,14 @@ Description:
                 Defines the penalty which will be applied to an
                 originator message's tq-field on every hop.
 
+What:           /sys/class/net/<mesh_iface>/mesh/network_coding
+Date:           Nov 2012
+Contact:        Martin Hundeboll <martin@hundeboll.net>
+Description:
+                Controls whether Network Coding (using some magic
+                to send fewer wifi packets but still the same
+                content) is enabled or not.
+
 What:           /sys/class/net/<mesh_iface>/mesh/orig_interval
 Date:           May 2010
 Contact:        Marek Lindner <lindner_marek@yahoo.de>
diff --git a/Documentation/DocBook/80211.tmpl b/Documentation/DocBook/80211.tmpl
index 284ced7..0f6a3ed 100644
--- a/Documentation/DocBook/80211.tmpl
+++ b/Documentation/DocBook/80211.tmpl
@@ -437,7 +437,7 @@
       </section>
 !Finclude/net/mac80211.h ieee80211_get_buffered_bc
 !Finclude/net/mac80211.h ieee80211_beacon_get
-!Finclude/net/mac80211.h ieee80211_sta_eosp_irqsafe
+!Finclude/net/mac80211.h ieee80211_sta_eosp
 !Finclude/net/mac80211.h ieee80211_frame_release_type
 !Finclude/net/mac80211.h ieee80211_sta_ps_transition
 !Finclude/net/mac80211.h ieee80211_sta_ps_transition_ni
diff --git a/Documentation/cgroups/00-INDEX b/Documentation/cgroups/00-INDEX
index f5635a0..bc461b6 100644
--- a/Documentation/cgroups/00-INDEX
+++ b/Documentation/cgroups/00-INDEX
@@ -18,6 +18,8 @@ memcg_test.txt
 	- Memory Resource Controller; implementation details.
 memory.txt
 	- Memory Resource Controller; design, accounting, interface, testing.
+net_cls.txt
+	- Network classifier cgroups details and usages.
 net_prio.txt
 	- Network priority cgroups details and usages.
 resource_counter.txt
diff --git a/Documentation/cgroups/net_cls.txt b/Documentation/cgroups/net_cls.txt
new file mode 100644
index 0000000..9face6b
--- /dev/null
+++ b/Documentation/cgroups/net_cls.txt
@@ -0,0 +1,34 @@
+Network classifier cgroup
+-------------------------
+
+The Network classifier cgroup provides an interface to
+tag network packets with a class identifier (classid).
+
+The Traffic Controller (tc) can be used to assign
+different priorities to packets from different cgroups.
+
+Creating a net_cls cgroups instance creates a net_cls.classid file.
+This net_cls.classid value is initialized to 0.
+
+You can write hexadecimal values to net_cls.classid; the format for these
+values is 0xAAAABBBB; AAAA is the major handle number and BBBB
+is the minor handle number.
+Reading net_cls.classid yields a decimal result.
+
+Example:
+mkdir /sys/fs/cgroup/net_cls
+mount -t cgroup -onet_cls net_cls /sys/fs/cgroup/net_cls
+mkdir /sys/fs/cgroup/net_cls/0
+echo 0x100001 >  /sys/fs/cgroup/net_cls/0/net_cls.classid
+	- setting a 10:1 handle.
+
+cat /sys/fs/cgroup/net_cls/0/net_cls.classid
+1048577
+
+configuring tc:
+tc qdisc add dev eth0 root handle 10: htb
+
+tc class add dev eth0 parent 10: classid 10:1 htb rate 40mbit
+ - creating traffic class 10:1
+
+tc filter add dev eth0 parent 10: protocol ip prio 10 handle 1: cgroup
diff --git a/Documentation/devicetree/bindings/marvell.txt b/Documentation/devicetree/bindings/marvell.txt
index f1533d9..f7a0da6 100644
--- a/Documentation/devicetree/bindings/marvell.txt
+++ b/Documentation/devicetree/bindings/marvell.txt
@@ -115,6 +115,9 @@ prefixed with the string "marvell,", for Marvell Technology Group Ltd.
      - compatible : "marvell,mv64360-eth-block"
      - reg : Offset and length of the register set for this block
 
+   Optional properties:
+     - clocks : Phandle to the clock control device and gate bit
+
    Example Discovery Ethernet block node:
      ethernet-block@2000 {
 	     #address-cells = <1>;
diff --git a/Documentation/devicetree/bindings/net/can/atmel-can.txt b/Documentation/devicetree/bindings/net/can/atmel-can.txt
new file mode 100644
index 0000000..72cf0c5
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/can/atmel-can.txt
@@ -0,0 +1,14 @@
+* AT91 CAN *
+
+Required properties:
+  - compatible: Should be "atmel,at91sam9263-can" or "atmel,at91sam9x5-can"
+  - reg: Should contain CAN controller registers location and length
+  - interrupts: Should contain IRQ line for the CAN controller
+
+Example:
+
+	can0: can@f000c000 {
+		compatbile = "atmel,at91sam9x5-can";
+		reg = <0xf000c000 0x300>;
+		interrupts = <40 4 5>
+	};
diff --git a/Documentation/devicetree/bindings/net/cpsw.txt b/Documentation/devicetree/bindings/net/cpsw.txt
index ecfdf75..4f2ca6b 100644
--- a/Documentation/devicetree/bindings/net/cpsw.txt
+++ b/Documentation/devicetree/bindings/net/cpsw.txt
@@ -15,16 +15,22 @@ Required properties:
 - mac_control		: Specifies Default MAC control register content
 			  for the specific platform
 - slaves		: Specifies number for slaves
-- cpts_active_slave	: Specifies the slave to use for time stamping
+- active_slave		: Specifies the slave to use for time stamping,
+			  ethtool and SIOCGMIIPHY
 - cpts_clock_mult	: Numerator to convert input clock ticks into nanoseconds
 - cpts_clock_shift	: Denominator to convert input clock ticks into nanoseconds
-- phy_id		: Specifies slave phy id
-- mac-address		: Specifies slave MAC address
 
 Optional properties:
 - ti,hwmods		: Must be "cpgmac0"
 - no_bd_ram		: Must be 0 or 1
 - dual_emac		: Specifies Switch to act as Dual EMAC
+
+Slave Properties:
+Required properties:
+- phy_id		: Specifies slave phy id
+- mac-address		: Specifies slave MAC address
+
+Optional properties:
 - dual_emac_res_vlan	: Specifies VID to be used to segregate the ports
 
 Note: "ti,hwmods" field is used to fetch the base address and irq
@@ -47,7 +53,7 @@ Examples:
 		rx_descs = <64>;
 		mac_control = <0x20>;
 		slaves = <2>;
-		cpts_active_slave = <0>;
+		active_slave = <0>;
 		cpts_clock_mult = <0x80000000>;
 		cpts_clock_shift = <29>;
 		cpsw_emac0: slave@0 {
@@ -73,7 +79,7 @@ Examples:
 		rx_descs = <64>;
 		mac_control = <0x20>;
 		slaves = <2>;
-		cpts_active_slave = <0>;
+		active_slave = <0>;
 		cpts_clock_mult = <0x80000000>;
 		cpts_clock_shift = <29>;
 		cpsw_emac0: slave@0 {
diff --git a/Documentation/devicetree/bindings/net/dsa/dsa.txt b/Documentation/devicetree/bindings/net/dsa/dsa.txt
new file mode 100644
index 0000000..49f4f7a
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/dsa/dsa.txt
@@ -0,0 +1,91 @@
+Marvell Distributed Switch Architecture Device Tree Bindings
+------------------------------------------------------------
+
+Required properties:
+- compatible		: Should be "marvell,dsa"
+- #address-cells	: Must be 2, first cell is the address on the MDIO bus
+			  and second cell is the address in the switch tree.
+			  Second cell is used only when cascading/chaining.
+- #size-cells		: Must be 0
+- dsa,ethernet		: Should be a phandle to a valid Ethernet device node
+- dsa,mii-bus		: Should be a phandle to a valid MDIO bus device node
+
+Optionnal properties:
+- interrupts		: property with a value describing the switch
+			  interrupt number (not supported by the driver)
+
+A DSA node can contain multiple switch chips which are therefore child nodes of
+the parent DSA node. The maximum number of allowed child nodes is 4
+(DSA_MAX_SWITCHES).
+Each of these switch child nodes should have the following required properties:
+
+- reg			: Describes the switch address on the MII bus
+- #address-cells	: Must be 1
+- #size-cells		: Must be 0
+
+A switch may have multiple "port" children nodes
+
+Each port children node must have the following mandatory properties:
+- reg			: Describes the port address in the switch
+- label			: Describes the label associated with this port, special
+			  labels are "cpu" to indicate a CPU port and "dsa" to
+			  indicate an uplink/downlink port.
+
+Note that a port labelled "dsa" will imply checking for the uplink phandle
+described below.
+
+Optionnal property:
+- link			: Should be a phandle to another switch's DSA port.
+			  This property is only used when switches are being
+			  chained/cascaded together.
+
+Example:
+
+	dsa@0 {
+		compatible = "marvell,dsa";
+		#address-cells = <2>;
+		#size-cells = <0>;
+
+		interrupts = <10>;
+		dsa,ethernet = <&ethernet0>;
+		dsa,mii-bus = <&mii_bus0>;
+
+		switch@0 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <16 0>;	/* MDIO address 16, switch 0 in tree */
+
+			port@0 {
+				reg = <0>;
+				label = "lan1";
+			};
+
+			port@1 {
+				reg = <1>;
+				label = "lan2";
+			};
+
+			port@5 {
+				reg = <5>;
+				label = "cpu";
+			};
+
+			switch0uplink: port@6 {
+				reg = <6>;
+				label = "dsa";
+				link = <&switch1uplink>;
+			};
+		};
+
+		switch@1 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <17 1>;	/* MDIO address 17, switch 1 in tree */
+
+			switch1uplink: port@0 {
+				reg = <0>;
+				label = "dsa";
+				link = <&switch0uplink>;
+			};
+		};
+	};
diff --git a/Documentation/devicetree/bindings/net/marvell-orion-mdio.txt b/Documentation/devicetree/bindings/net/marvell-orion-mdio.txt
index 34e7aaf..9417e54 100644
--- a/Documentation/devicetree/bindings/net/marvell-orion-mdio.txt
+++ b/Documentation/devicetree/bindings/net/marvell-orion-mdio.txt
@@ -9,6 +9,10 @@ Required properties:
 - compatible: "marvell,orion-mdio"
 - reg: address and length of the SMI register
 
+Optional properties:
+- interrupts: interrupt line number for the SMI error/done interrupt
+- clocks: Phandle to the clock control device and gate bit
+
 The child nodes of the MDIO driver are the individual PHY devices
 connected to this MDIO bus. They must have a "reg" property given the
 PHY address on the MDIO bus.
diff --git a/Documentation/networking/ieee802154.txt b/Documentation/networking/ieee802154.txt
index 703cf43..67a9cb2 100644
--- a/Documentation/networking/ieee802154.txt
+++ b/Documentation/networking/ieee802154.txt
@@ -71,8 +71,9 @@ submits skb to qdisc), so if you need something from that cb later, you should
 store info in the skb->data on your own.
 
 To hook the MLME interface you have to populate the ml_priv field of your
-net_device with a pointer to struct ieee802154_mlme_ops instance. All fields are
-required.
+net_device with a pointer to struct ieee802154_mlme_ops instance. The fields
+assoc_req, assoc_resp, disassoc_req, start_req, and scan_req are optional.
+All other fields are required.
 
 We provide an example of simple HardMAC driver at drivers/ieee802154/fakehard.c
 
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index dc2dc87..f98ca63 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -29,7 +29,7 @@ route/max_size - INTEGER
 neigh/default/gc_thresh1 - INTEGER
 	Minimum number of entries to keep.  Garbage collector will not
 	purge entries if there are fewer than this number.
-	Default: 256
+	Default: 128
 
 neigh/default/gc_thresh3 - INTEGER
 	Maximum number of neighbor entries allowed.  Increase this
@@ -175,14 +175,6 @@ tcp_congestion_control - STRING
 	is inherited.
 	[see setsockopt(listenfd, SOL_TCP, TCP_CONGESTION, "name" ...) ]
 
-tcp_cookie_size - INTEGER
-	Default size of TCP Cookie Transactions (TCPCT) option, that may be
-	overridden on a per socket basis by the TCPCT socket option.
-	Values greater than the maximum (16) are interpreted as the maximum.
-	Values greater than zero and less than the minimum (8) are interpreted
-	as the minimum.  Odd values are interpreted as the next even value.
-	Default: 0 (off).
-
 tcp_dsack - BOOLEAN
 	Allows TCP to send "duplicate" SACKs.
 
@@ -190,7 +182,9 @@ tcp_early_retrans - INTEGER
 	Enable Early Retransmit (ER), per RFC 5827. ER lowers the threshold
 	for triggering fast retransmit when the amount of outstanding data is
 	small and when no previously unsent data can be transmitted (such
-	that limited transmit could be used).
+	that limited transmit could be used). Also controls the use of
+	Tail loss probe (TLP) that converts RTOs occuring due to tail
+	losses into fast recovery (draft-dukkipati-tcpm-tcp-loss-probe-01).
 	Possible values:
 		0 disables ER
 		1 enables ER
@@ -198,7 +192,9 @@ tcp_early_retrans - INTEGER
 		  by a fourth of RTT. This mitigates connection falsely
 		  recovers when network has a small degree of reordering
 		  (less than 3 packets).
-	Default: 2
+		3 enables delayed ER and TLP.
+		4 enables TLP only.
+	Default: 3
 
 tcp_ecn - INTEGER
 	Control use of Explicit Congestion Notification (ECN) by TCP.
@@ -229,36 +225,13 @@ tcp_fin_timeout - INTEGER
 	Default: 60 seconds
 
 tcp_frto - INTEGER
-	Enables Forward RTO-Recovery (F-RTO) defined in RFC4138.
+	Enables Forward RTO-Recovery (F-RTO) defined in RFC5682.
 	F-RTO is an enhanced recovery algorithm for TCP retransmission
-	timeouts.  It is particularly beneficial in wireless environments
-	where packet loss is typically due to random radio interference
-	rather than intermediate router congestion.  F-RTO is sender-side
-	only modification. Therefore it does not require any support from
-	the peer.
-
-	If set to 1, basic version is enabled.  2 enables SACK enhanced
-	F-RTO if flow uses SACK.  The basic version can be used also when
-	SACK is in use though scenario(s) with it exists where F-RTO
-	interacts badly with the packet counting of the SACK enabled TCP
-	flow.
-
-tcp_frto_response - INTEGER
-	When F-RTO has detected that a TCP retransmission timeout was
-	spurious (i.e, the timeout would have been avoided had TCP set a
-	longer retransmission timeout), TCP has several options what to do
-	next. Possible values are:
-		0 Rate halving based; a smooth and conservative response,
-		  results in halved cwnd and ssthresh after one RTT
-		1 Very conservative response; not recommended because even
-		  though being valid, it interacts poorly with the rest of
-		  Linux TCP, halves cwnd and ssthresh immediately
-		2 Aggressive response; undoes congestion control measures
-		  that are now known to be unnecessary (ignoring the
-		  possibility of a lost retransmission that would require
-		  TCP to be more cautious), cwnd and ssthresh are restored
-		  to the values prior timeout
-	Default: 0 (rate halving based)
+	timeouts.  It is particularly beneficial in networks where the
+	RTT fluctuates (e.g., wireless). F-RTO is sender-side only
+	modification. It does not require any support from the peer.
+
+	By default it's enabled with a non-zero value. 0 disables F-RTO.
 
 tcp_keepalive_time - INTEGER
 	How often TCP sends out keepalive messages when keepalive is enabled.
diff --git a/Documentation/networking/netlink_mmap.txt b/Documentation/networking/netlink_mmap.txt
new file mode 100644
index 0000000..1c2dab4
--- /dev/null
+++ b/Documentation/networking/netlink_mmap.txt
@@ -0,0 +1,339 @@
+This file documents how to use memory mapped I/O with netlink.
+
+Author: Patrick McHardy <kaber@trash.net>
+
+Overview
+--------
+
+Memory mapped netlink I/O can be used to increase throughput and decrease
+overhead of unicast receive and transmit operations. Some netlink subsystems
+require high throughput, these are mainly the netfilter subsystems
+nfnetlink_queue and nfnetlink_log, but it can also help speed up large
+dump operations of f.i. the routing database.
+
+Memory mapped netlink I/O used two circular ring buffers for RX and TX which
+are mapped into the processes address space.
+
+The RX ring is used by the kernel to directly construct netlink messages into
+user-space memory without copying them as done with regular socket I/O,
+additionally as long as the ring contains messages no recvmsg() or poll()
+syscalls have to be issued by user-space to get more message.
+
+The TX ring is used to process messages directly from user-space memory, the
+kernel processes all messages contained in the ring using a single sendmsg()
+call.
+
+Usage overview
+--------------
+
+In order to use memory mapped netlink I/O, user-space needs three main changes:
+
+- ring setup
+- conversion of the RX path to get messages from the ring instead of recvmsg()
+- conversion of the TX path to construct messages into the ring
+
+Ring setup is done using setsockopt() to provide the ring parameters to the
+kernel, then a call to mmap() to map the ring into the processes address space:
+
+- setsockopt(fd, SOL_NETLINK, NETLINK_RX_RING, &params, sizeof(params));
+- setsockopt(fd, SOL_NETLINK, NETLINK_TX_RING, &params, sizeof(params));
+- ring = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)
+
+Usage of either ring is optional, but even if only the RX ring is used the
+mapping still needs to be writable in order to update the frame status after
+processing.
+
+Conversion of the reception path involves calling poll() on the file
+descriptor, once the socket is readable the frames from the ring are
+processsed in order until no more messages are available, as indicated by
+a status word in the frame header.
+
+On kernel side, in order to make use of memory mapped I/O on receive, the
+originating netlink subsystem needs to support memory mapped I/O, otherwise
+it will use an allocated socket buffer as usual and the contents will be
+ copied to the ring on transmission, nullifying most of the performance gains.
+Dumps of kernel databases automatically support memory mapped I/O.
+
+Conversion of the transmit path involves changing message contruction to
+use memory from the TX ring instead of (usually) a buffer declared on the
+stack and setting up the frame header approriately. Optionally poll() can
+be used to wait for free frames in the TX ring.
+
+Structured and definitions for using memory mapped I/O are contained in
+<linux/netlink.h>.
+
+RX and TX rings
+----------------
+
+Each ring contains a number of continous memory blocks, containing frames of
+fixed size dependant on the parameters used for ring setup.
+
+Ring:	[ block 0 ]
+		[ frame 0 ]
+		[ frame 1 ]
+	[ block 1 ]
+		[ frame 2 ]
+		[ frame 3 ]
+	...
+	[ block n ]
+		[ frame 2 * n ]
+		[ frame 2 * n + 1 ]
+
+The blocks are only visible to the kernel, from the point of view of user-space
+the ring just contains the frames in a continous memory zone.
+
+The ring parameters used for setting up the ring are defined as follows:
+
+struct nl_mmap_req {
+	unsigned int	nm_block_size;
+	unsigned int	nm_block_nr;
+	unsigned int	nm_frame_size;
+	unsigned int	nm_frame_nr;
+};
+
+Frames are grouped into blocks, where each block is a continous region of memory
+and holds nm_block_size / nm_frame_size frames. The total number of frames in
+the ring is nm_frame_nr. The following invariants hold:
+
+- frames_per_block = nm_block_size / nm_frame_size
+
+- nm_frame_nr = frames_per_block * nm_block_nr
+
+Some parameters are constrained, specifically:
+
+- nm_block_size must be a multiple of the architectures memory page size.
+  The getpagesize() function can be used to get the page size.
+
+- nm_frame_size must be equal or larger to NL_MMAP_HDRLEN, IOW a frame must be
+  able to hold at least the frame header
+
+- nm_frame_size must be smaller or equal to nm_block_size
+
+- nm_frame_size must be a multiple of NL_MMAP_MSG_ALIGNMENT
+
+- nm_frame_nr must equal the actual number of frames as specified above.
+
+When the kernel can't allocate phsyically continous memory for a ring block,
+it will fall back to use physically discontinous memory. This might affect
+performance negatively, in order to avoid this the nm_frame_size parameter
+should be chosen to be as small as possible for the required frame size and
+the number of blocks should be increased instead.
+
+Ring frames
+------------
+
+Each frames contain a frame header, consisting of a synchronization word and some
+meta-data, and the message itself.
+
+Frame:	[ header message ]
+
+The frame header is defined as follows:
+
+struct nl_mmap_hdr {
+	unsigned int	nm_status;
+	unsigned int	nm_len;
+	__u32		nm_group;
+	/* credentials */
+	__u32		nm_pid;
+	__u32		nm_uid;
+	__u32		nm_gid;
+};
+
+- nm_status is used for synchronizing processing between the kernel and user-
+  space and specifies ownership of the frame as well as the operation to perform
+
+- nm_len contains the length of the message contained in the data area
+
+- nm_group specified the destination multicast group of message
+
+- nm_pid, nm_uid and nm_gid contain the netlink pid, UID and GID of the sending
+  process. These values correspond to the data available using SOCK_PASSCRED in
+  the SCM_CREDENTIALS cmsg.
+
+The possible values in the status word are:
+
+- NL_MMAP_STATUS_UNUSED:
+	RX ring:	frame belongs to the kernel and contains no message
+			for user-space. Approriate action is to invoke poll()
+			to wait for new messages.
+
+	TX ring:	frame belongs to user-space and can be used for
+			message construction.
+
+- NL_MMAP_STATUS_RESERVED:
+	RX ring only:	frame is currently used by the kernel for message
+			construction and contains no valid message yet.
+			Appropriate action is to invoke poll() to wait for
+			new messages.
+
+- NL_MMAP_STATUS_VALID:
+	RX ring:	frame contains a valid message. Approriate action is
+			to process the message and release the frame back to
+			the kernel by setting the status to
+			NL_MMAP_STATUS_UNUSED or queue the frame by setting the
+			status to NL_MMAP_STATUS_SKIP.
+
+	TX ring:	the frame contains a valid message from user-space to
+			be processed by the kernel. After completing processing
+			the kernel will release the frame back to user-space by
+			setting the status to NL_MMAP_STATUS_UNUSED.
+
+- NL_MMAP_STATUS_COPY:
+	RX ring only:	a message is ready to be processed but could not be
+			stored in the ring, either because it exceeded the
+			frame size or because the originating subsystem does
+			not support memory mapped I/O. Appropriate action is
+			to invoke recvmsg() to receive the message and release
+			the frame back to the kernel by setting the status to
+			NL_MMAP_STATUS_UNUSED.
+
+- NL_MMAP_STATUS_SKIP:
+	RX ring only:	user-space queued the message for later processing, but
+			processed some messages following it in the ring. The
+			kernel should skip this frame when looking for unused
+			frames.
+
+The data area of a frame begins at a offset of NL_MMAP_HDRLEN relative to the
+frame header.
+
+TX limitations
+--------------
+
+Kernel processing usually involves validation of the message received by
+user-space, then processing its contents. The kernel must assure that
+userspace is not able to modify the message contents after they have been
+validated. In order to do so, the message is copied from the ring frame
+to an allocated buffer if either of these conditions is false:
+
+- only a single mapping of the ring exists
+- the file descriptor is not shared between processes
+
+This means that for threaded programs, the kernel will fall back to copying.
+
+Example
+-------
+
+Ring setup:
+
+	unsigned int block_size = 16 * getpagesize();
+	struct nl_mmap_req req = {
+		.nm_block_size		= block_size,
+		.nm_block_nr		= 64,
+		.nm_frame_size		= 16384,
+		.nm_frame_nr		= 64 * block_size / 16384,
+	};
+	unsigned int ring_size;
+	void *rx_ring, *tx_ring;
+
+	/* Configure ring parameters */
+	if (setsockopt(fd, NETLINK_RX_RING, &req, sizeof(req)) < 0)
+		exit(1);
+	if (setsockopt(fd, NETLINK_TX_RING, &req, sizeof(req)) < 0)
+		exit(1)
+
+	/* Calculate size of each invididual ring */
+	ring_size = req.nm_block_nr * req.nm_block_size;
+
+	/* Map RX/TX rings. The TX ring is located after the RX ring */
+	rx_ring = mmap(NULL, 2 * ring_size, PROT_READ | PROT_WRITE,
+		       MAP_SHARED, fd, 0);
+	if ((long)rx_ring == -1L)
+		exit(1);
+	tx_ring = rx_ring + ring_size:
+
+Message reception:
+
+This example assumes some ring parameters of the ring setup are available.
+
+	unsigned int frame_offset = 0;
+	struct nl_mmap_hdr *hdr;
+	struct nlmsghdr *nlh;
+	unsigned char buf[16384];
+	ssize_t len;
+
+	while (1) {
+		struct pollfd pfds[1];
+
+		pfds[0].fd	= fd;
+		pfds[0].events	= POLLIN | POLLERR;
+		pfds[0].revents	= 0;
+
+		if (poll(pfds, 1, -1) < 0 && errno != -EINTR)
+			exit(1);
+
+		/* Check for errors. Error handling omitted */
+		if (pfds[0].revents & POLLERR)
+			<handle error>
+
+		/* If no new messages, poll again */
+		if (!(pfds[0].revents & POLLIN))
+			continue;
+
+		/* Process all frames */
+		while (1) {
+			/* Get next frame header */
+			hdr = rx_ring + frame_offset;
+
+			if (hdr->nm_status == NL_MMAP_STATUS_VALID)
+				/* Regular memory mapped frame */
+				nlh = (void *hdr) + NL_MMAP_HDRLEN;
+				len = hdr->nm_len;
+
+				/* Release empty message immediately. May happen
+				 * on error during message construction.
+				 */
+				if (len == 0)
+					goto release;
+			} else if (hdr->nm_status == NL_MMAP_STATUS_COPY) {
+				/* Frame queued to socket receive queue */
+				len = recv(fd, buf, sizeof(buf), MSG_DONTWAIT);
+				if (len <= 0)
+					break;
+				nlh = buf;
+			} else
+				/* No more messages to process, continue polling */
+				break;
+
+			process_msg(nlh);
+release:
+			/* Release frame back to the kernel */
+			hdr->nm_status = NL_MMAP_STATUS_UNUSED;
+
+			/* Advance frame offset to next frame */
+			frame_offset = (frame_offset + frame_size) % ring_size;
+		}
+	}
+
+Message transmission:
+
+This example assumes some ring parameters of the ring setup are available.
+A single message is constructed and transmitted, to send multiple messages
+at once they would be constructed in consecutive frames before a final call
+to sendto().
+
+	unsigned int frame_offset = 0;
+	struct nl_mmap_hdr *hdr;
+	struct nlmsghdr *nlh;
+	struct sockaddr_nl addr = {
+		.nl_family	= AF_NETLINK,
+	};
+
+	hdr = tx_ring + frame_offset;
+	if (hdr->nm_status != NL_MMAP_STATUS_UNUSED)
+		/* No frame available. Use poll() to avoid. */
+		exit(1);
+
+	nlh = (void *)hdr + NL_MMAP_HDRLEN;
+
+	/* Build message */
+	build_message(nlh);
+
+	/* Fill frame header: length and status need to be set */
+	hdr->nm_len	= nlh->nlmsg_len;
+	hdr->nm_status	= NL_MMAP_STATUS_VALID;
+
+	if (sendto(fd, NULL, 0, 0, &addr, sizeof(addr)) < 0)
+		exit(1);
+
+	/* Advance frame offset to next frame */
+	frame_offset = (frame_offset + frame_size) % ring_size;
diff --git a/Documentation/networking/packet_mmap.txt b/Documentation/networking/packet_mmap.txt
index 94444b1..23dd80e 100644
--- a/Documentation/networking/packet_mmap.txt
+++ b/Documentation/networking/packet_mmap.txt
@@ -685,14 +685,342 @@ int main(int argc, char **argp)
 }
 
 -------------------------------------------------------------------------------
++ AF_PACKET TPACKET_V3 example
+-------------------------------------------------------------------------------
+
+AF_PACKET's TPACKET_V3 ring buffer can be configured to use non-static frame
+sizes by doing it's own memory management. It is based on blocks where polling
+works on a per block basis instead of per ring as in TPACKET_V2 and predecessor.
+
+It is said that TPACKET_V3 brings the following benefits:
+ *) ~15 - 20% reduction in CPU-usage
+ *) ~20% increase in packet capture rate
+ *) ~2x increase in packet density
+ *) Port aggregation analysis
+ *) Non static frame size to capture entire packet payload
+
+So it seems to be a good candidate to be used with packet fanout.
+
+Minimal example code by Daniel Borkmann based on Chetan Loke's lolpcap (compile
+it with gcc -Wall -O2 blob.c, and try things like "./a.out eth0", etc.):
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <assert.h>
+#include <net/if.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <poll.h>
+#include <unistd.h>
+#include <signal.h>
+#include <inttypes.h>
+#include <sys/socket.h>
+#include <sys/mman.h>
+#include <linux/if_packet.h>
+#include <linux/if_ether.h>
+#include <linux/ip.h>
+
+#define BLOCK_SIZE		(1 << 22)
+#define FRAME_SIZE		2048
+
+#define NUM_BLOCKS		64
+#define NUM_FRAMES		((BLOCK_SIZE * NUM_BLOCKS) / FRAME_SIZE)
+
+#define BLOCK_RETIRE_TOV_IN_MS	64
+#define BLOCK_PRIV_AREA_SZ	13
+
+#define ALIGN_8(x)		(((x) + 8 - 1) & ~(8 - 1))
+
+#define BLOCK_STATUS(x)		((x)->h1.block_status)
+#define BLOCK_NUM_PKTS(x)	((x)->h1.num_pkts)
+#define BLOCK_O2FP(x)		((x)->h1.offset_to_first_pkt)
+#define BLOCK_LEN(x)		((x)->h1.blk_len)
+#define BLOCK_SNUM(x)		((x)->h1.seq_num)
+#define BLOCK_O2PRIV(x)		((x)->offset_to_priv)
+#define BLOCK_PRIV(x)		((void *) ((uint8_t *) (x) + BLOCK_O2PRIV(x)))
+#define BLOCK_HDR_LEN		(ALIGN_8(sizeof(struct block_desc)))
+#define BLOCK_PLUS_PRIV(sz_pri)	(BLOCK_HDR_LEN + ALIGN_8((sz_pri)))
+
+#ifndef likely
+# define likely(x)		__builtin_expect(!!(x), 1)
+#endif
+#ifndef unlikely
+# define unlikely(x)		__builtin_expect(!!(x), 0)
+#endif
+
+struct block_desc {
+	uint32_t version;
+	uint32_t offset_to_priv;
+	struct tpacket_hdr_v1 h1;
+};
+
+struct ring {
+	struct iovec *rd;
+	uint8_t *map;
+	struct tpacket_req3 req;
+};
+
+static unsigned long packets_total = 0, bytes_total = 0;
+static sig_atomic_t sigint = 0;
+
+void sighandler(int num)
+{
+	sigint = 1;
+}
+
+static int setup_socket(struct ring *ring, char *netdev)
+{
+	int err, i, fd, v = TPACKET_V3;
+	struct sockaddr_ll ll;
+
+	fd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
+	if (fd < 0) {
+		perror("socket");
+		exit(1);
+	}
+
+	err = setsockopt(fd, SOL_PACKET, PACKET_VERSION, &v, sizeof(v));
+	if (err < 0) {
+		perror("setsockopt");
+		exit(1);
+	}
+
+	memset(&ring->req, 0, sizeof(ring->req));
+	ring->req.tp_block_size = BLOCK_SIZE;
+	ring->req.tp_frame_size = FRAME_SIZE;
+	ring->req.tp_block_nr = NUM_BLOCKS;
+	ring->req.tp_frame_nr = NUM_FRAMES;
+	ring->req.tp_retire_blk_tov = BLOCK_RETIRE_TOV_IN_MS;
+	ring->req.tp_sizeof_priv = BLOCK_PRIV_AREA_SZ;
+	ring->req.tp_feature_req_word |= TP_FT_REQ_FILL_RXHASH;
+
+	err = setsockopt(fd, SOL_PACKET, PACKET_RX_RING, &ring->req,
+			 sizeof(ring->req));
+	if (err < 0) {
+		perror("setsockopt");
+		exit(1);
+	}
+
+	ring->map = mmap(NULL, ring->req.tp_block_size * ring->req.tp_block_nr,
+			 PROT_READ | PROT_WRITE, MAP_SHARED | MAP_LOCKED,
+			 fd, 0);
+	if (ring->map == MAP_FAILED) {
+		perror("mmap");
+		exit(1);
+	}
+
+	ring->rd = malloc(ring->req.tp_block_nr * sizeof(*ring->rd));
+	assert(ring->rd);
+	for (i = 0; i < ring->req.tp_block_nr; ++i) {
+		ring->rd[i].iov_base = ring->map + (i * ring->req.tp_block_size);
+		ring->rd[i].iov_len = ring->req.tp_block_size;
+	}
+
+	memset(&ll, 0, sizeof(ll));
+	ll.sll_family = PF_PACKET;
+	ll.sll_protocol = htons(ETH_P_ALL);
+	ll.sll_ifindex = if_nametoindex(netdev);
+	ll.sll_hatype = 0;
+	ll.sll_pkttype = 0;
+	ll.sll_halen = 0;
+
+	err = bind(fd, (struct sockaddr *) &ll, sizeof(ll));
+	if (err < 0) {
+		perror("bind");
+		exit(1);
+	}
+
+	return fd;
+}
+
+#ifdef __checked
+static uint64_t prev_block_seq_num = 0;
+
+void assert_block_seq_num(struct block_desc *pbd)
+{
+	if (unlikely(prev_block_seq_num + 1 != BLOCK_SNUM(pbd))) {
+		printf("prev_block_seq_num:%"PRIu64", expected seq:%"PRIu64" != "
+		       "actual seq:%"PRIu64"\n", prev_block_seq_num,
+		       prev_block_seq_num + 1, (uint64_t) BLOCK_SNUM(pbd));
+		exit(1);
+	}
+
+	prev_block_seq_num = BLOCK_SNUM(pbd);
+}
+
+static void assert_block_len(struct block_desc *pbd, uint32_t bytes, int block_num)
+{
+	if (BLOCK_NUM_PKTS(pbd)) {
+		if (unlikely(bytes != BLOCK_LEN(pbd))) {
+			printf("block:%u with %upackets, expected len:%u != actual len:%u\n",
+			       block_num, BLOCK_NUM_PKTS(pbd), bytes, BLOCK_LEN(pbd));
+			exit(1);
+		}
+	} else {
+		if (unlikely(BLOCK_LEN(pbd) != BLOCK_PLUS_PRIV(BLOCK_PRIV_AREA_SZ))) {
+			printf("block:%u, expected len:%lu != actual len:%u\n",
+			       block_num, BLOCK_HDR_LEN, BLOCK_LEN(pbd));
+			exit(1);
+		}
+	}
+}
+
+static void assert_block_header(struct block_desc *pbd, const int block_num)
+{
+	uint32_t block_status = BLOCK_STATUS(pbd);
+
+	if (unlikely((block_status & TP_STATUS_USER) == 0)) {
+		printf("block:%u, not in TP_STATUS_USER\n", block_num);
+		exit(1);
+	}
+
+	assert_block_seq_num(pbd);
+}
+#else
+static inline void assert_block_header(struct block_desc *pbd, const int block_num)
+{
+}
+static void assert_block_len(struct block_desc *pbd, uint32_t bytes, int block_num)
+{
+}
+#endif
+
+static void display(struct tpacket3_hdr *ppd)
+{
+	struct ethhdr *eth = (struct ethhdr *) ((uint8_t *) ppd + ppd->tp_mac);
+	struct iphdr *ip = (struct iphdr *) ((uint8_t *) eth + ETH_HLEN);
+
+	if (eth->h_proto == htons(ETH_P_IP)) {
+		struct sockaddr_in ss, sd;
+		char sbuff[NI_MAXHOST], dbuff[NI_MAXHOST];
+
+		memset(&ss, 0, sizeof(ss));
+		ss.sin_family = PF_INET;
+		ss.sin_addr.s_addr = ip->saddr;
+		getnameinfo((struct sockaddr *) &ss, sizeof(ss),
+			    sbuff, sizeof(sbuff), NULL, 0, NI_NUMERICHOST);
+
+		memset(&sd, 0, sizeof(sd));
+		sd.sin_family = PF_INET;
+		sd.sin_addr.s_addr = ip->daddr;
+		getnameinfo((struct sockaddr *) &sd, sizeof(sd),
+			    dbuff, sizeof(dbuff), NULL, 0, NI_NUMERICHOST);
+
+		printf("%s -> %s, ", sbuff, dbuff);
+	}
+
+	printf("rxhash: 0x%x\n", ppd->hv1.tp_rxhash);
+}
+
+static void walk_block(struct block_desc *pbd, const int block_num)
+{
+	int num_pkts = BLOCK_NUM_PKTS(pbd), i;
+	unsigned long bytes = 0;
+	unsigned long bytes_with_padding = BLOCK_PLUS_PRIV(BLOCK_PRIV_AREA_SZ);
+	struct tpacket3_hdr *ppd;
+
+	assert_block_header(pbd, block_num);
+
+	ppd = (struct tpacket3_hdr *) ((uint8_t *) pbd + BLOCK_O2FP(pbd));
+	for (i = 0; i < num_pkts; ++i) {
+		bytes += ppd->tp_snaplen;
+		if (ppd->tp_next_offset)
+			bytes_with_padding += ppd->tp_next_offset;
+		else
+			bytes_with_padding += ALIGN_8(ppd->tp_snaplen + ppd->tp_mac);
+
+		display(ppd);
+
+		ppd = (struct tpacket3_hdr *) ((uint8_t *) ppd + ppd->tp_next_offset);
+		__sync_synchronize();
+	}
+
+	assert_block_len(pbd, bytes_with_padding, block_num);
+
+	packets_total += num_pkts;
+	bytes_total += bytes;
+}
+
+void flush_block(struct block_desc *pbd)
+{
+	BLOCK_STATUS(pbd) = TP_STATUS_KERNEL;
+	__sync_synchronize();
+}
+
+static void teardown_socket(struct ring *ring, int fd)
+{
+	munmap(ring->map, ring->req.tp_block_size * ring->req.tp_block_nr);
+	free(ring->rd);
+	close(fd);
+}
+
+int main(int argc, char **argp)
+{
+	int fd, err;
+	socklen_t len;
+	struct ring ring;
+	struct pollfd pfd;
+	unsigned int block_num = 0;
+	struct block_desc *pbd;
+	struct tpacket_stats_v3 stats;
+
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s INTERFACE\n", argp[0]);
+		return EXIT_FAILURE;
+	}
+
+	signal(SIGINT, sighandler);
+
+	memset(&ring, 0, sizeof(ring));
+	fd = setup_socket(&ring, argp[argc - 1]);
+	assert(fd > 0);
+
+	memset(&pfd, 0, sizeof(pfd));
+	pfd.fd = fd;
+	pfd.events = POLLIN | POLLERR;
+	pfd.revents = 0;
+
+	while (likely(!sigint)) {
+		pbd = (struct block_desc *) ring.rd[block_num].iov_base;
+retry_block:
+		if ((BLOCK_STATUS(pbd) & TP_STATUS_USER) == 0) {
+			poll(&pfd, 1, -1);
+			goto retry_block;
+		}
+
+		walk_block(pbd, block_num);
+		flush_block(pbd);
+		block_num = (block_num + 1) % NUM_BLOCKS;
+	}
+
+	len = sizeof(stats);
+	err = getsockopt(fd, SOL_PACKET, PACKET_STATISTICS, &stats, &len);
+	if (err < 0) {
+		perror("getsockopt");
+		exit(1);
+	}
+
+	fflush(stdout);
+	printf("\nReceived %u packets, %lu bytes, %u dropped, freeze_q_cnt: %u\n",
+	       stats.tp_packets, bytes_total, stats.tp_drops,
+	       stats.tp_freeze_q_cnt);
+
+	teardown_socket(&ring, fd);
+	return 0;
+}
+
+-------------------------------------------------------------------------------
 + PACKET_TIMESTAMP
 -------------------------------------------------------------------------------
 
 The PACKET_TIMESTAMP setting determines the source of the timestamp in
-the packet meta information.  If your NIC is capable of timestamping
-packets in hardware, you can request those hardware timestamps to used.
-Note: you may need to enable the generation of hardware timestamps with
-SIOCSHWTSTAMP.
+the packet meta information for mmap(2)ed RX_RING and TX_RINGs.  If your
+NIC is capable of timestamping packets in hardware, you can request those
+hardware timestamps to be used. Note: you may need to enable the generation
+of hardware timestamps with SIOCSHWTSTAMP (see related information from
+Documentation/networking/timestamping.txt).
 
 PACKET_TIMESTAMP accepts the same integer bit field as
 SO_TIMESTAMPING.  However, only the SOF_TIMESTAMPING_SYS_HARDWARE
@@ -704,8 +1032,36 @@ SOF_TIMESTAMPING_RAW_HARDWARE if both bits are set.
     req |= SOF_TIMESTAMPING_SYS_HARDWARE;
     setsockopt(fd, SOL_PACKET, PACKET_TIMESTAMP, (void *) &req, sizeof(req))
 
-If PACKET_TIMESTAMP is not set, a software timestamp generated inside
-the networking stack is used (the behavior before this setting was added).
+For the mmap(2)ed ring buffers, such timestamps are stored in the
+tpacket{,2,3}_hdr structure's tp_sec and tp_{n,u}sec members. To determine
+what kind of timestamp has been reported, the tp_status field is binary |'ed
+with the following possible bits ...
+
+    TP_STATUS_TS_SYS_HARDWARE
+    TP_STATUS_TS_RAW_HARDWARE
+    TP_STATUS_TS_SOFTWARE
+
+... that are equivalent to its SOF_TIMESTAMPING_* counterparts. For the
+RX_RING, if none of those 3 are set (i.e. PACKET_TIMESTAMP is not set),
+then this means that a software fallback was invoked *within* PF_PACKET's
+processing code (less precise).
+
+Getting timestamps for the TX_RING works as follows: i) fill the ring frames,
+ii) call sendto() e.g. in blocking mode, iii) wait for status of relevant
+frames to be updated resp. the frame handed over to the application, iv) walk
+through the frames to pick up the individual hw/sw timestamps.
+
+Only (!) if transmit timestamping is enabled, then these bits are combined
+with binary | with TP_STATUS_AVAILABLE, so you must check for that in your
+application (e.g. !(tp_status & (TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING))
+in a first step to see if the frame belongs to the application, and then
+one can extract the type of timestamp in a second step from tp_status)!
+
+If you don't care about them, thus having it disabled, checking for
+TP_STATUS_AVAILABLE resp. TP_STATUS_WRONG_FORMAT is sufficient. If in the
+TX_RING part only TP_STATUS_AVAILABLE is set, then the tp_sec and tp_{n,u}sec
+members do not contain a valid value. For TX_RINGs, by default no timestamp
+is generated!
 
 See include/linux/net_tstamp.h and Documentation/networking/timestamping
 for more information on hardware timestamps.
diff --git a/Documentation/networking/stmmac.txt b/Documentation/networking/stmmac.txt
index f9fa6db..654d2e5 100644
--- a/Documentation/networking/stmmac.txt
+++ b/Documentation/networking/stmmac.txt
@@ -1,6 +1,6 @@
        STMicroelectronics 10/100/1000 Synopsys Ethernet driver
 
-Copyright (C) 2007-2010  STMicroelectronics Ltd
+Copyright (C) 2007-2013  STMicroelectronics Ltd
 Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
 
 This is the driver for the MAC 10/100/1000 on-chip Ethernet controllers
@@ -10,7 +10,7 @@ Currently this network device driver is for all STM embedded MAC/GMAC
 (i.e. 7xxx/5xxx SoCs), SPEAr (arm), Loongson1B (mips) and XLINX XC2V3000
 FF1152AMT0221 D1215994A VIRTEX FPGA board.
 
-DWC Ether MAC 10/100/1000 Universal version 3.60a (and older) and DWC Ether
+DWC Ether MAC 10/100/1000 Universal version 3.70a (and older) and DWC Ether
 MAC 10/100 Universal version 4.0 have been used for developing this driver.
 
 This driver supports both the platform bus and PCI.
@@ -32,6 +32,8 @@ The kernel configuration option is STMMAC_ETH:
 	watchdog: transmit timeout (in milliseconds);
 	flow_ctrl: Flow control ability [on/off];
 	pause: Flow Control Pause Time;
+	eee_timer: tx EEE timer;
+	chain_mode: select chain mode instead of ring.
 
 3) Command line options
 Driver parameters can be also passed in command line by using:
@@ -164,12 +166,12 @@ Where:
  o bus_setup: perform HW setup of the bus. For example, on some ST platforms
 	     this field is used to configure the AMBA  bridge to generate more
 	     efficient STBus traffic.
- o init/exit: callbacks used for calling a custom initialisation;
+ o init/exit: callbacks used for calling a custom initialization;
 	     this is sometime necessary on some platforms (e.g. ST boxes)
 	     where the HW needs to have set some PIO lines or system cfg
 	     registers.
  o custom_cfg/custom_data: this is a custom configuration that can be passed
-			   while initialising the resources.
+			   while initializing the resources.
  o bsp_priv: another private poiter.
 
 For MDIO bus The we have:
@@ -273,6 +275,8 @@ reset procedure etc).
  o norm_desc.c: functions for handling normal descriptors;
  o chain_mode.c/ring_mode.c:: functions to manage RING/CHAINED modes;
  o mmc_core.c/mmc.h: Management MAC Counters;
+ o stmmac_hwtstamp.c: HW timestamp support for PTP
+ o stmmac_ptp.c: PTP 1588 clock
 
 5) Debug Information
 
@@ -326,6 +330,35 @@ To enter in Tx LPI mode the driver needs to have a software timer
 that enable and disable the LPI mode when there is nothing to be
 transmitted.
 
-7) TODO:
+7) Extended descriptors
+The extended descriptors give us information about the receive Ethernet payload
+when it is carrying PTP packets or TCP/UDP/ICMP over IP.
+These are not available on GMAC Synopsys chips older than the 3.50.
+At probe time the driver will decide if these can be actually used.
+This support also is mandatory for PTPv2 because the extra descriptors 6 and 7
+are used for saving the hardware timestamps.
+
+8) Precision Time Protocol (PTP)
+The driver supports the IEEE 1588-2002, Precision Time Protocol (PTP),
+which enables precise synchronization of clocks in measurement and
+control systems implemented with technologies such as network
+communication.
+
+In addition to the basic timestamp features mentioned in IEEE 1588-2002
+Timestamps, new GMAC cores support the advanced timestamp features.
+IEEE 1588-2008 that can be enabled when configure the Kernel.
+
+9) SGMII/RGMII supports
+New GMAC devices provide own way to manage RGMII/SGMII.
+This information is available at run-time by looking at the
+HW capability register. This means that the stmmac can manage
+auto-negotiation and link status w/o using the PHYLIB stuff
+In fact, the HW provides a subset of extended registers to
+restart the ANE, verify Full/Half duplex mode and Speed.
+Also thanks to these registers it is possible to look at the
+Auto-negotiated Link Parter Ability.
+
+10) TODO:
  o XGMAC is not supported.
- o Add the PTP - precision time protocol
+ o Complete the TBI & RTBI support.
+ o extened VLAN support for 3.70a SYNP GMAC.