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authorJonathan Corbet <corbet@lwn.net>2019-06-14 14:18:53 -0600
committerJonathan Corbet <corbet@lwn.net>2019-06-14 14:18:53 -0600
commit8afecfb0ec961e37e61b2d19c4fa71617a9482de (patch)
treec43ea51a47b1e76b762caa4c1b0c356249e5e874 /Documentation
parentce1a5ea18ef9bf4c62c75abe7c540a29264ec988 (diff)
parentd1fdb6d8f6a4109a4263176c84b899076a5f8008 (diff)
Merge tag 'v5.2-rc4' into mauro
We need to pick up post-rc1 changes to various document files so they don't get lost in Mauro's massive RST conversion push.
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ABI/testing/sysfs-bus-mdio29
-rw-r--r--Documentation/ABI/testing/sysfs-class-net-phydev19
-rw-r--r--Documentation/admin-guide/cgroup-v2.rst9
-rw-r--r--Documentation/arm64/silicon-errata.txt9
-rw-r--r--Documentation/bpf/btf.rst2
-rw-r--r--Documentation/devicetree/bindings/Makefile2
-rw-r--r--Documentation/devicetree/bindings/arm/arm-boards4
-rw-r--r--Documentation/devicetree/bindings/arm/cpu-capacity.txt12
-rw-r--r--Documentation/devicetree/bindings/arm/omap/crossbar.txt2
-rw-r--r--Documentation/devicetree/bindings/clock/samsung,s5pv210-clock.txt2
-rw-r--r--Documentation/devicetree/bindings/interrupt-controller/arm,gic.yaml24
-rw-r--r--Documentation/devicetree/bindings/interrupt-controller/marvell,odmi-controller.txt2
-rw-r--r--Documentation/devicetree/bindings/leds/irled/spi-ir-led.txt2
-rw-r--r--Documentation/devicetree/bindings/mtd/amlogic,meson-nand.txt2
-rw-r--r--Documentation/devicetree/bindings/mtd/brcm,brcmnand.txt6
-rw-r--r--Documentation/devicetree/bindings/mtd/denali-nand.txt6
-rw-r--r--Documentation/devicetree/bindings/mtd/fsmc-nand.txt6
-rw-r--r--Documentation/devicetree/bindings/mtd/gpmc-nand.txt2
-rw-r--r--Documentation/devicetree/bindings/mtd/hisi504-nand.txt2
-rw-r--r--Documentation/devicetree/bindings/mtd/marvell-nand.txt14
-rw-r--r--Documentation/devicetree/bindings/mtd/mxc-nand.txt6
-rw-r--r--Documentation/devicetree/bindings/mtd/nvidia-tegra20-nand.txt6
-rw-r--r--Documentation/devicetree/bindings/mtd/oxnas-nand.txt2
-rw-r--r--Documentation/devicetree/bindings/mtd/qcom_nandc.txt4
-rw-r--r--Documentation/devicetree/bindings/mtd/samsung-s3c2410.txt6
-rw-r--r--Documentation/devicetree/bindings/mtd/stm32-fmc2-nand.txt6
-rw-r--r--Documentation/devicetree/bindings/mtd/tango-nand.txt2
-rw-r--r--Documentation/devicetree/bindings/mtd/vf610-nfc.txt8
-rw-r--r--Documentation/devicetree/bindings/sifive/sifive-blocks-ip-versioning.txt38
-rw-r--r--Documentation/filesystems/overlayfs.txt16
-rw-r--r--Documentation/kbuild/makefiles.txt14
-rw-r--r--Documentation/networking/device_drivers/index.rst30
-rw-r--r--Documentation/networking/index.rst16
-rw-r--r--Documentation/networking/ip-sysctl.txt4
-rw-r--r--Documentation/networking/segmentation-offloads.rst4
-rw-r--r--Documentation/networking/tls-offload-layers.svg1
-rw-r--r--Documentation/networking/tls-offload-reorder-bad.svg1
-rw-r--r--Documentation/networking/tls-offload-reorder-good.svg1
-rw-r--r--Documentation/networking/tls-offload.rst482
-rw-r--r--Documentation/networking/tls.rst (renamed from Documentation/networking/tls.txt)44
-rw-r--r--Documentation/usb/rio.txt66
-rw-r--r--Documentation/vm/hmm.rst8
42 files changed, 716 insertions, 205 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-mdio b/Documentation/ABI/testing/sysfs-bus-mdio
deleted file mode 100644
index 491baaf4285f..000000000000
--- a/Documentation/ABI/testing/sysfs-bus-mdio
+++ /dev/null
@@ -1,29 +0,0 @@
-What: /sys/bus/mdio_bus/devices/.../phy_id
-Date: November 2012
-KernelVersion: 3.8
-Contact: netdev@vger.kernel.org
-Description:
- This attribute contains the 32-bit PHY Identifier as reported
- by the device during bus enumeration, encoded in hexadecimal.
- This ID is used to match the device with the appropriate
- driver.
-
-What: /sys/bus/mdio_bus/devices/.../phy_interface
-Date: February 2014
-KernelVersion: 3.15
-Contact: netdev@vger.kernel.org
-Description:
- This attribute contains the PHY interface as configured by the
- Ethernet driver during bus enumeration, encoded in string.
- This interface mode is used to configure the Ethernet MAC with the
- appropriate mode for its data lines to the PHY hardware.
-
-What: /sys/bus/mdio_bus/devices/.../phy_has_fixups
-Date: February 2014
-KernelVersion: 3.15
-Contact: netdev@vger.kernel.org
-Description:
- This attribute contains the boolean value whether a given PHY
- device has had any "fixup" workaround running on it, encoded as
- a boolean. This information is provided to help troubleshooting
- PHY configurations.
diff --git a/Documentation/ABI/testing/sysfs-class-net-phydev b/Documentation/ABI/testing/sysfs-class-net-phydev
index 6ebabfb27912..2a5723343aba 100644
--- a/Documentation/ABI/testing/sysfs-class-net-phydev
+++ b/Documentation/ABI/testing/sysfs-class-net-phydev
@@ -11,24 +11,31 @@ Date: February 2014
KernelVersion: 3.15
Contact: netdev@vger.kernel.org
Description:
- Boolean value indicating whether the PHY device has
- any fixups registered against it (phy_register_fixup)
+ This attribute contains the boolean value whether a given PHY
+ device has had any "fixup" workaround running on it, encoded as
+ a boolean. This information is provided to help troubleshooting
+ PHY configurations.
What: /sys/class/mdio_bus/<bus>/<device>/phy_id
Date: November 2012
KernelVersion: 3.8
Contact: netdev@vger.kernel.org
Description:
- 32-bit hexadecimal value corresponding to the PHY device's OUI,
- model and revision number.
+ This attribute contains the 32-bit PHY Identifier as reported
+ by the device during bus enumeration, encoded in hexadecimal.
+ This ID is used to match the device with the appropriate
+ driver.
What: /sys/class/mdio_bus/<bus>/<device>/phy_interface
Date: February 2014
KernelVersion: 3.15
Contact: netdev@vger.kernel.org
Description:
- String value indicating the PHY interface, possible
- values are:.
+ This attribute contains the PHY interface as configured by the
+ Ethernet driver during bus enumeration, encoded in string.
+ This interface mode is used to configure the Ethernet MAC with the
+ appropriate mode for its data lines to the PHY hardware.
+ Possible values are:
<empty> (not available), mii, gmii, sgmii, tbi, rev-mii,
rmii, rgmii, rgmii-id, rgmii-rxid, rgmii-txid, rtbi, smii
xgmii, moca, qsgmii, trgmii, 1000base-x, 2500base-x, rxaui,
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index 88e746074252..cf88c1f98270 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -177,6 +177,15 @@ cgroup v2 currently supports the following mount options.
ignored on non-init namespace mounts. Please refer to the
Delegation section for details.
+ memory_localevents
+
+ Only populate memory.events with data for the current cgroup,
+ and not any subtrees. This is legacy behaviour, the default
+ behaviour without this option is to include subtree counts.
+ This option is system wide and can only be set on mount or
+ modified through remount from the init namespace. The mount
+ option is ignored on non-init namespace mounts.
+
Organizing Processes and Threads
--------------------------------
diff --git a/Documentation/arm64/silicon-errata.txt b/Documentation/arm64/silicon-errata.txt
index 68d9b74fd751..2735462d5958 100644
--- a/Documentation/arm64/silicon-errata.txt
+++ b/Documentation/arm64/silicon-errata.txt
@@ -58,13 +58,14 @@ stable kernels.
| ARM | Cortex-A72 | #853709 | N/A |
| ARM | Cortex-A73 | #858921 | ARM64_ERRATUM_858921 |
| ARM | Cortex-A55 | #1024718 | ARM64_ERRATUM_1024718 |
-| ARM | Cortex-A76 | #1188873 | ARM64_ERRATUM_1188873 |
+| ARM | Cortex-A76 | #1188873,1418040| ARM64_ERRATUM_1418040 |
| ARM | Cortex-A76 | #1165522 | ARM64_ERRATUM_1165522 |
| ARM | Cortex-A76 | #1286807 | ARM64_ERRATUM_1286807 |
-| ARM | Neoverse-N1 | #1188873 | ARM64_ERRATUM_1188873 |
-| ARM | MMU-500 | #841119,#826419 | N/A |
+| ARM | Cortex-A76 | #1463225 | ARM64_ERRATUM_1463225 |
+| ARM | Neoverse-N1 | #1188873,1418040| ARM64_ERRATUM_1418040 |
+| ARM | MMU-500 | #841119,826419 | N/A |
| | | | |
-| Cavium | ThunderX ITS | #22375, #24313 | CAVIUM_ERRATUM_22375 |
+| Cavium | ThunderX ITS | #22375,24313 | CAVIUM_ERRATUM_22375 |
| Cavium | ThunderX ITS | #23144 | CAVIUM_ERRATUM_23144 |
| Cavium | ThunderX GICv3 | #23154 | CAVIUM_ERRATUM_23154 |
| Cavium | ThunderX Core | #27456 | CAVIUM_ERRATUM_27456 |
diff --git a/Documentation/bpf/btf.rst b/Documentation/bpf/btf.rst
index 4ae022d274ab..4d565d202ce3 100644
--- a/Documentation/bpf/btf.rst
+++ b/Documentation/bpf/btf.rst
@@ -131,7 +131,7 @@ The following sections detail encoding of each kind.
``btf_type`` is followed by a ``u32`` with the following bits arrangement::
#define BTF_INT_ENCODING(VAL) (((VAL) & 0x0f000000) >> 24)
- #define BTF_INT_OFFSET(VAL) (((VAL & 0x00ff0000)) >> 16)
+ #define BTF_INT_OFFSET(VAL) (((VAL) & 0x00ff0000) >> 16)
#define BTF_INT_BITS(VAL) ((VAL) & 0x000000ff)
The ``BTF_INT_ENCODING`` has the following attributes::
diff --git a/Documentation/devicetree/bindings/Makefile b/Documentation/devicetree/bindings/Makefile
index 63b139f9ae28..8a2774b5834b 100644
--- a/Documentation/devicetree/bindings/Makefile
+++ b/Documentation/devicetree/bindings/Makefile
@@ -5,7 +5,7 @@ DT_MK_SCHEMA ?= dt-mk-schema
DT_MK_SCHEMA_FLAGS := $(if $(DT_SCHEMA_FILES), -u)
quiet_cmd_chk_binding = CHKDT $(patsubst $(srctree)/%,%,$<)
- cmd_chk_binding = $(DT_DOC_CHECKER) $< ; \
+ cmd_chk_binding = $(DT_DOC_CHECKER) -u $(srctree)/$(src) $< ; \
$(DT_EXTRACT_EX) $< > $@
$(obj)/%.example.dts: $(src)/%.yaml FORCE
diff --git a/Documentation/devicetree/bindings/arm/arm-boards b/Documentation/devicetree/bindings/arm/arm-boards
index b6e810c2781a..abff8d834a6a 100644
--- a/Documentation/devicetree/bindings/arm/arm-boards
+++ b/Documentation/devicetree/bindings/arm/arm-boards
@@ -216,7 +216,7 @@ Example:
#size-cells = <0>;
A57_0: cpu@0 {
- compatible = "arm,cortex-a57","arm,armv8";
+ compatible = "arm,cortex-a57";
reg = <0x0 0x0>;
device_type = "cpu";
enable-method = "psci";
@@ -225,7 +225,7 @@ Example:
.....
A53_0: cpu@100 {
- compatible = "arm,cortex-a53","arm,armv8";
+ compatible = "arm,cortex-a53";
reg = <0x0 0x100>;
device_type = "cpu";
enable-method = "psci";
diff --git a/Documentation/devicetree/bindings/arm/cpu-capacity.txt b/Documentation/devicetree/bindings/arm/cpu-capacity.txt
index 96fa46cb133c..380e21c5fc7e 100644
--- a/Documentation/devicetree/bindings/arm/cpu-capacity.txt
+++ b/Documentation/devicetree/bindings/arm/cpu-capacity.txt
@@ -118,7 +118,7 @@ cpus {
};
A57_0: cpu@0 {
- compatible = "arm,cortex-a57","arm,armv8";
+ compatible = "arm,cortex-a57";
reg = <0x0 0x0>;
device_type = "cpu";
enable-method = "psci";
@@ -129,7 +129,7 @@ cpus {
};
A57_1: cpu@1 {
- compatible = "arm,cortex-a57","arm,armv8";
+ compatible = "arm,cortex-a57";
reg = <0x0 0x1>;
device_type = "cpu";
enable-method = "psci";
@@ -140,7 +140,7 @@ cpus {
};
A53_0: cpu@100 {
- compatible = "arm,cortex-a53","arm,armv8";
+ compatible = "arm,cortex-a53";
reg = <0x0 0x100>;
device_type = "cpu";
enable-method = "psci";
@@ -151,7 +151,7 @@ cpus {
};
A53_1: cpu@101 {
- compatible = "arm,cortex-a53","arm,armv8";
+ compatible = "arm,cortex-a53";
reg = <0x0 0x101>;
device_type = "cpu";
enable-method = "psci";
@@ -162,7 +162,7 @@ cpus {
};
A53_2: cpu@102 {
- compatible = "arm,cortex-a53","arm,armv8";
+ compatible = "arm,cortex-a53";
reg = <0x0 0x102>;
device_type = "cpu";
enable-method = "psci";
@@ -173,7 +173,7 @@ cpus {
};
A53_3: cpu@103 {
- compatible = "arm,cortex-a53","arm,armv8";
+ compatible = "arm,cortex-a53";
reg = <0x0 0x103>;
device_type = "cpu";
enable-method = "psci";
diff --git a/Documentation/devicetree/bindings/arm/omap/crossbar.txt b/Documentation/devicetree/bindings/arm/omap/crossbar.txt
index 4cd5d873fc3a..a43e4c7aba3d 100644
--- a/Documentation/devicetree/bindings/arm/omap/crossbar.txt
+++ b/Documentation/devicetree/bindings/arm/omap/crossbar.txt
@@ -41,7 +41,7 @@ Examples:
Consumer:
========
See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt and
-Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt for
+Documentation/devicetree/bindings/interrupt-controller/arm,gic.yaml for
further details.
An interrupt consumer on an SoC using crossbar will use:
diff --git a/Documentation/devicetree/bindings/clock/samsung,s5pv210-clock.txt b/Documentation/devicetree/bindings/clock/samsung,s5pv210-clock.txt
index 15b48e20a061..a86c83bf9d4e 100644
--- a/Documentation/devicetree/bindings/clock/samsung,s5pv210-clock.txt
+++ b/Documentation/devicetree/bindings/clock/samsung,s5pv210-clock.txt
@@ -35,7 +35,7 @@ board device tree, including the system base clock, as selected by XOM[0]
pin of the SoC. Refer to generic fixed rate clock bindings
documentation[1] for more information how to specify these clocks.
-[1] Documentation/devicetree/bindings/clock/fixed-clock.txt
+[1] Documentation/devicetree/bindings/clock/fixed-clock.yaml
Example: Clock controller node:
diff --git a/Documentation/devicetree/bindings/interrupt-controller/arm,gic.yaml b/Documentation/devicetree/bindings/interrupt-controller/arm,gic.yaml
index 54838d4ea44c..9a47820ef346 100644
--- a/Documentation/devicetree/bindings/interrupt-controller/arm,gic.yaml
+++ b/Documentation/devicetree/bindings/interrupt-controller/arm,gic.yaml
@@ -92,6 +92,8 @@ properties:
minItems: 2
maxItems: 4
+ ranges: true
+
interrupts:
description: Interrupt source of the parent interrupt controller on
secondary GICs, or VGIC maintenance interrupt on primary GIC (see
@@ -197,28 +199,28 @@ examples:
interrupt-controller@e1101000 {
compatible = "arm,gic-400";
#interrupt-cells = <3>;
- #address-cells = <2>;
- #size-cells = <2>;
+ #address-cells = <1>;
+ #size-cells = <1>;
interrupt-controller;
interrupts = <1 8 0xf04>;
- ranges = <0 0 0 0xe1100000 0 0x100000>;
- reg = <0x0 0xe1110000 0 0x01000>,
- <0x0 0xe112f000 0 0x02000>,
- <0x0 0xe1140000 0 0x10000>,
- <0x0 0xe1160000 0 0x10000>;
+ ranges = <0 0xe1100000 0x100000>;
+ reg = <0xe1110000 0x01000>,
+ <0xe112f000 0x02000>,
+ <0xe1140000 0x10000>,
+ <0xe1160000 0x10000>;
- v2m0: v2m@8000 {
+ v2m0: v2m@80000 {
compatible = "arm,gic-v2m-frame";
msi-controller;
- reg = <0x0 0x80000 0 0x1000>;
+ reg = <0x80000 0x1000>;
};
//...
- v2mN: v2m@9000 {
+ v2mN: v2m@90000 {
compatible = "arm,gic-v2m-frame";
msi-controller;
- reg = <0x0 0x90000 0 0x1000>;
+ reg = <0x90000 0x1000>;
};
};
...
diff --git a/Documentation/devicetree/bindings/interrupt-controller/marvell,odmi-controller.txt b/Documentation/devicetree/bindings/interrupt-controller/marvell,odmi-controller.txt
index 930fb462fd9f..0ebfc952cb34 100644
--- a/Documentation/devicetree/bindings/interrupt-controller/marvell,odmi-controller.txt
+++ b/Documentation/devicetree/bindings/interrupt-controller/marvell,odmi-controller.txt
@@ -23,7 +23,7 @@ Required properties:
- marvell,spi-base : List of GIC base SPI interrupts, one for each
ODMI frame. Those SPI interrupts are 0-based,
i.e marvell,spi-base = <128> will use SPI #96.
- See Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt
+ See Documentation/devicetree/bindings/interrupt-controller/arm,gic.yaml
for details about the GIC Device Tree binding.
Example:
diff --git a/Documentation/devicetree/bindings/leds/irled/spi-ir-led.txt b/Documentation/devicetree/bindings/leds/irled/spi-ir-led.txt
index 896b6997cf30..21882c8d4b0c 100644
--- a/Documentation/devicetree/bindings/leds/irled/spi-ir-led.txt
+++ b/Documentation/devicetree/bindings/leds/irled/spi-ir-led.txt
@@ -15,7 +15,7 @@ Optional properties:
- power-supply: specifies the power source. It can either be a regulator
or a gpio which enables a regulator, i.e. a regulator-fixed as
described in
- Documentation/devicetree/bindings/regulator/fixed-regulator.txt
+ Documentation/devicetree/bindings/regulator/fixed-regulator.yaml
Example:
diff --git a/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.txt b/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.txt
index 3983c11e062c..5794ab1147c1 100644
--- a/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.txt
@@ -24,7 +24,7 @@ Optional children nodes:
Children nodes represent the available nand chips.
Other properties:
-see Documentation/devicetree/bindings/mtd/nand.txt for generic bindings.
+see Documentation/devicetree/bindings/mtd/nand-controller.yaml for generic bindings.
Example demonstrate on AXG SoC:
diff --git a/Documentation/devicetree/bindings/mtd/brcm,brcmnand.txt b/Documentation/devicetree/bindings/mtd/brcm,brcmnand.txt
index bcda1dfc4bac..0b7c3738b66c 100644
--- a/Documentation/devicetree/bindings/mtd/brcm,brcmnand.txt
+++ b/Documentation/devicetree/bindings/mtd/brcm,brcmnand.txt
@@ -101,12 +101,12 @@ Required properties:
number (e.g., 0, 1, 2, etc.)
- #address-cells : see partition.txt
- #size-cells : see partition.txt
-- nand-ecc-strength : see nand.txt
-- nand-ecc-step-size : must be 512 or 1024. See nand.txt
+- nand-ecc-strength : see nand-controller.yaml
+- nand-ecc-step-size : must be 512 or 1024. See nand-controller.yaml
Optional properties:
- nand-on-flash-bbt : boolean, to enable the on-flash BBT for this
- chip-select. See nand.txt
+ chip-select. See nand-controller.yaml
- brcm,nand-oob-sector-size : integer, to denote the spare area sector size
expected for the ECC layout in use. This size, in
addition to the strength and step-size,
diff --git a/Documentation/devicetree/bindings/mtd/denali-nand.txt b/Documentation/devicetree/bindings/mtd/denali-nand.txt
index b14b6751c2f3..b32aed1db46d 100644
--- a/Documentation/devicetree/bindings/mtd/denali-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/denali-nand.txt
@@ -22,16 +22,16 @@ Sub-nodes:
select is connected.
Optional properties:
- - nand-ecc-step-size: see nand.txt for details.
+ - nand-ecc-step-size: see nand-controller.yaml for details.
If present, the value must be
512 for "altr,socfpga-denali-nand"
1024 for "socionext,uniphier-denali-nand-v5a"
1024 for "socionext,uniphier-denali-nand-v5b"
- - nand-ecc-strength: see nand.txt for details. Valid values are:
+ - nand-ecc-strength: see nand-controller.yaml for details. Valid values are:
8, 15 for "altr,socfpga-denali-nand"
8, 16, 24 for "socionext,uniphier-denali-nand-v5a"
8, 16 for "socionext,uniphier-denali-nand-v5b"
- - nand-ecc-maximize: see nand.txt for details
+ - nand-ecc-maximize: see nand-controller.yaml for details
The chip nodes may optionally contain sub-nodes describing partitions of the
address space. See partition.txt for more detail.
diff --git a/Documentation/devicetree/bindings/mtd/fsmc-nand.txt b/Documentation/devicetree/bindings/mtd/fsmc-nand.txt
index 32636eb77304..6762d3c4d5a4 100644
--- a/Documentation/devicetree/bindings/mtd/fsmc-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/fsmc-nand.txt
@@ -30,9 +30,9 @@ Optional properties:
command is asserted. Zero means one cycle, 255 means 256
cycles.
- bank: default NAND bank to use (0-3 are valid, 0 is the default).
-- nand-ecc-mode : see nand.txt
-- nand-ecc-strength : see nand.txt
-- nand-ecc-step-size : see nand.txt
+- nand-ecc-mode : see nand-controller.yaml
+- nand-ecc-strength : see nand-controller.yaml
+- nand-ecc-step-size : see nand-controller.yaml
Can support 1-bit HW ECC (default) or if stronger correction is required,
software-based BCH.
diff --git a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
index c059ab74ed88..44919d48d241 100644
--- a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
@@ -8,7 +8,7 @@ explained in a separate documents - please refer to
Documentation/devicetree/bindings/memory-controllers/omap-gpmc.txt
For NAND specific properties such as ECC modes or bus width, please refer to
-Documentation/devicetree/bindings/mtd/nand.txt
+Documentation/devicetree/bindings/mtd/nand-controller.yaml
Required properties:
diff --git a/Documentation/devicetree/bindings/mtd/hisi504-nand.txt b/Documentation/devicetree/bindings/mtd/hisi504-nand.txt
index 2e35f0662912..8963983ae7cb 100644
--- a/Documentation/devicetree/bindings/mtd/hisi504-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/hisi504-nand.txt
@@ -7,7 +7,7 @@ Required properties:
NAND controller's registers. The second contains base
physical address and size of NAND controller's buffer.
- interrupts: Interrupt number for nfc.
-- nand-bus-width: See nand.txt.
+- nand-bus-width: See nand-controller.yaml.
- nand-ecc-mode: Support none and hw ecc mode.
- #address-cells: Partition address, should be set 1.
- #size-cells: Partition size, should be set 1.
diff --git a/Documentation/devicetree/bindings/mtd/marvell-nand.txt b/Documentation/devicetree/bindings/mtd/marvell-nand.txt
index e0c790706b9b..a2d9a0f2b683 100644
--- a/Documentation/devicetree/bindings/mtd/marvell-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/marvell-nand.txt
@@ -36,29 +36,29 @@ Children nodes represent the available NAND chips.
Required properties:
- reg: shall contain the native Chip Select ids (0-3).
-- nand-rb: see nand.txt (0-1).
+- nand-rb: see nand-controller.yaml (0-1).
Optional properties:
- marvell,nand-keep-config: orders the driver not to take the timings
from the core and leaving them completely untouched. Bootloader
timings will then be used.
- label: MTD name.
-- nand-on-flash-bbt: see nand.txt.
-- nand-ecc-mode: see nand.txt. Will use hardware ECC if not specified.
-- nand-ecc-algo: see nand.txt. This property is essentially useful when
+- nand-on-flash-bbt: see nand-controller.yaml.
+- nand-ecc-mode: see nand-controller.yaml. Will use hardware ECC if not specified.
+- nand-ecc-algo: see nand-controller.yaml. This property is essentially useful when
not using hardware ECC. Howerver, it may be added when using hardware
ECC for clarification but will be ignored by the driver because ECC
mode is chosen depending on the page size and the strength required by
the NAND chip. This value may be overwritten with nand-ecc-strength
property.
-- nand-ecc-strength: see nand.txt.
-- nand-ecc-step-size: see nand.txt. Marvell's NAND flash controller does
+- nand-ecc-strength: see nand-controller.yaml.
+- nand-ecc-step-size: see nand-controller.yaml. Marvell's NAND flash controller does
use fixed strength (1-bit for Hamming, 16-bit for BCH), so the actual
step size will shrink or grow in order to fit the required strength.
Step sizes are not completely random for all and follow certain
patterns described in AN-379, "Marvell SoC NFC ECC".
-See Documentation/devicetree/bindings/mtd/nand.txt for more details on
+See Documentation/devicetree/bindings/mtd/nand-controller.yaml for more details on
generic bindings.
diff --git a/Documentation/devicetree/bindings/mtd/mxc-nand.txt b/Documentation/devicetree/bindings/mtd/mxc-nand.txt
index b5833d11c7be..2857c628fba4 100644
--- a/Documentation/devicetree/bindings/mtd/mxc-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/mxc-nand.txt
@@ -4,9 +4,9 @@ Required properties:
- compatible: "fsl,imxXX-nand"
- reg: address range of the nfc block
- interrupts: irq to be used
-- nand-bus-width: see nand.txt
-- nand-ecc-mode: see nand.txt
-- nand-on-flash-bbt: see nand.txt
+- nand-bus-width: see nand-controller.yaml
+- nand-ecc-mode: see nand-controller.yaml
+- nand-on-flash-bbt: see nand-controller.yaml
Example:
diff --git a/Documentation/devicetree/bindings/mtd/nvidia-tegra20-nand.txt b/Documentation/devicetree/bindings/mtd/nvidia-tegra20-nand.txt
index b2f2ca12f9e6..e737e5beb7bf 100644
--- a/Documentation/devicetree/bindings/mtd/nvidia-tegra20-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/nvidia-tegra20-nand.txt
@@ -26,14 +26,14 @@ Optional children node properties:
"hw" is supported.
- nand-ecc-algo: string, algorithm of NAND ECC.
Supported values with "hw" ECC mode are: "rs", "bch".
-- nand-bus-width : See nand.txt
-- nand-on-flash-bbt: See nand.txt
+- nand-bus-width : See nand-controller.yaml
+- nand-on-flash-bbt: See nand-controller.yaml
- nand-ecc-strength: integer representing the number of bits to correct
per ECC step (always 512). Supported strength using HW ECC
modes are:
- RS: 4, 6, 8
- BCH: 4, 8, 14, 16
-- nand-ecc-maximize: See nand.txt
+- nand-ecc-maximize: See nand-controller.yaml
- nand-is-boot-medium: Makes sure only ECC strengths supported by the boot ROM
are chosen.
- wp-gpios: GPIO specifier for the write protect pin.
diff --git a/Documentation/devicetree/bindings/mtd/oxnas-nand.txt b/Documentation/devicetree/bindings/mtd/oxnas-nand.txt
index 56d5c19da41d..2ba07fc8b79c 100644
--- a/Documentation/devicetree/bindings/mtd/oxnas-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/oxnas-nand.txt
@@ -1,6 +1,6 @@
* Oxford Semiconductor OXNAS NAND Controller
-Please refer to nand.txt for generic information regarding MTD NAND bindings.
+Please refer to nand-controller.yaml for generic information regarding MTD NAND bindings.
Required properties:
- compatible: "oxsemi,ox820-nand"
diff --git a/Documentation/devicetree/bindings/mtd/qcom_nandc.txt b/Documentation/devicetree/bindings/mtd/qcom_nandc.txt
index 1123cc6d56ef..5c2fba4b30fe 100644
--- a/Documentation/devicetree/bindings/mtd/qcom_nandc.txt
+++ b/Documentation/devicetree/bindings/mtd/qcom_nandc.txt
@@ -47,8 +47,8 @@ Required properties:
- #size-cells: see partition.txt
Optional properties:
-- nand-bus-width: see nand.txt
-- nand-ecc-strength: see nand.txt. If not specified, then ECC strength will
+- nand-bus-width: see nand-controller.yaml
+- nand-ecc-strength: see nand-controller.yaml. If not specified, then ECC strength will
be used according to chip requirement and available
OOB size.
diff --git a/Documentation/devicetree/bindings/mtd/samsung-s3c2410.txt b/Documentation/devicetree/bindings/mtd/samsung-s3c2410.txt
index 0040eb8895e0..09815c40fc8a 100644
--- a/Documentation/devicetree/bindings/mtd/samsung-s3c2410.txt
+++ b/Documentation/devicetree/bindings/mtd/samsung-s3c2410.txt
@@ -6,7 +6,7 @@ Required properties:
"samsung,s3c2412-nand"
"samsung,s3c2440-nand"
- reg : register's location and length.
-- #address-cells, #size-cells : see nand.txt
+- #address-cells, #size-cells : see nand-controller.yaml
- clocks : phandle to the nand controller clock
- clock-names : must contain "nand"
@@ -14,8 +14,8 @@ Optional child nodes:
Child nodes representing the available nand chips.
Optional child properties:
-- nand-ecc-mode : see nand.txt
-- nand-on-flash-bbt : see nand.txt
+- nand-ecc-mode : see nand-controller.yaml
+- nand-on-flash-bbt : see nand-controller.yaml
Each child device node may optionally contain a 'partitions' sub-node,
which further contains sub-nodes describing the flash partition mapping.
diff --git a/Documentation/devicetree/bindings/mtd/stm32-fmc2-nand.txt b/Documentation/devicetree/bindings/mtd/stm32-fmc2-nand.txt
index ad2bef826582..e55895e8dae4 100644
--- a/Documentation/devicetree/bindings/mtd/stm32-fmc2-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/stm32-fmc2-nand.txt
@@ -24,9 +24,9 @@ Required properties:
- reg: describes the CS lines assigned to the NAND device.
Optional properties:
-- nand-on-flash-bbt: see nand.txt
-- nand-ecc-strength: see nand.txt
-- nand-ecc-step-size: see nand.txt
+- nand-on-flash-bbt: see nand-controller.yaml
+- nand-ecc-strength: see nand-controller.yaml
+- nand-ecc-step-size: see nand-controller.yaml
The following ECC strength and step size are currently supported:
- nand-ecc-strength = <1>, nand-ecc-step-size = <512> (Hamming)
diff --git a/Documentation/devicetree/bindings/mtd/tango-nand.txt b/Documentation/devicetree/bindings/mtd/tango-nand.txt
index cd1bf2ac9055..91c8420241af 100644
--- a/Documentation/devicetree/bindings/mtd/tango-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/tango-nand.txt
@@ -11,7 +11,7 @@ Required properties:
- #size-cells: <0>
Children nodes represent the available NAND chips.
-See Documentation/devicetree/bindings/mtd/nand.txt for generic bindings.
+See Documentation/devicetree/bindings/mtd/nand-controller.yaml for generic bindings.
Example:
diff --git a/Documentation/devicetree/bindings/mtd/vf610-nfc.txt b/Documentation/devicetree/bindings/mtd/vf610-nfc.txt
index c96eeb65f450..7db5e6e609df 100644
--- a/Documentation/devicetree/bindings/mtd/vf610-nfc.txt
+++ b/Documentation/devicetree/bindings/mtd/vf610-nfc.txt
@@ -25,14 +25,14 @@ only handle one NAND chip.
Required properties:
- compatible: Should be set to "fsl,vf610-nfc-cs".
-- nand-bus-width: see nand.txt
-- nand-ecc-mode: see nand.txt
+- nand-bus-width: see nand-controller.yaml
+- nand-ecc-mode: see nand-controller.yaml
Required properties for hardware ECC:
-- nand-ecc-strength: supported strengths are 24 and 32 bit (see nand.txt)
+- nand-ecc-strength: supported strengths are 24 and 32 bit (see nand-controller.yaml)
- nand-ecc-step-size: step size equals page size, currently only 2k pages are
supported
-- nand-on-flash-bbt: see nand.txt
+- nand-on-flash-bbt: see nand-controller.yaml
Example:
diff --git a/Documentation/devicetree/bindings/sifive/sifive-blocks-ip-versioning.txt b/Documentation/devicetree/bindings/sifive/sifive-blocks-ip-versioning.txt
new file mode 100644
index 000000000000..beaa3b64084e
--- /dev/null
+++ b/Documentation/devicetree/bindings/sifive/sifive-blocks-ip-versioning.txt
@@ -0,0 +1,38 @@
+DT compatible string versioning for SiFive open-source IP blocks
+
+This document describes the version specification for DT "compatible"
+strings for open-source SiFive IP blocks. HDL for these IP blocks
+can be found in this public repository:
+
+https://github.com/sifive/sifive-blocks
+
+IP block-specific DT compatible strings are contained within the HDL,
+in the form "sifive,<ip-block-name><integer version number>".
+
+An example is "sifive,uart0" from:
+
+https://github.com/sifive/sifive-blocks/blob/v1.0/src/main/scala/devices/uart/UART.scala#L43
+
+Until these IP blocks (or IP integration) support version
+auto-discovery, the maintainers of these IP blocks intend to increment
+the suffixed number in the compatible string whenever the software
+interface to these IP blocks changes, or when the functionality of the
+underlying IP blocks changes in a way that software should be aware of.
+
+Driver developers can use compatible string "match" values such as
+"sifive,uart0" to indicate that their driver is compatible with the
+register interface and functionality associated with the relevant
+upstream sifive-blocks commits. It is expected that most drivers will
+match on these IP block-specific compatible strings.
+
+DT data authors, when writing data for a particular SoC, should
+continue to specify an SoC-specific compatible string value, such as
+"sifive,fu540-c000-uart". This way, if SoC-specific
+integration-specific bug fixes or workarounds are needed, the kernel
+or other system software can match on this string to apply them. The
+IP block-specific compatible string (such as "sifive,uart0") should
+then be specified as a subsequent value.
+
+An example of this style:
+
+ compatible = "sifive,fu540-c000-uart", "sifive,uart0";
diff --git a/Documentation/filesystems/overlayfs.txt b/Documentation/filesystems/overlayfs.txt
index eef7d9d259e8..1da2f1668f08 100644
--- a/Documentation/filesystems/overlayfs.txt
+++ b/Documentation/filesystems/overlayfs.txt
@@ -336,8 +336,20 @@ the copied layers will fail the verification of the lower root file handle.
Non-standard behavior
---------------------
-Overlayfs can now act as a POSIX compliant filesystem with the following
-features turned on:
+Current version of overlayfs can act as a mostly POSIX compliant
+filesystem.
+
+This is the list of cases that overlayfs doesn't currently handle:
+
+a) POSIX mandates updating st_atime for reads. This is currently not
+done in the case when the file resides on a lower layer.
+
+b) If a file residing on a lower layer is opened for read-only and then
+memory mapped with MAP_SHARED, then subsequent changes to the file are not
+reflected in the memory mapping.
+
+The following options allow overlayfs to act more like a standards
+compliant filesystem:
1) "redirect_dir"
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index 03c065855eaf..d65ad5746f94 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -437,20 +437,6 @@ more details, with real examples.
The second argument is optional, and if supplied will be used
if first argument is not supported.
- cc-ldoption
- cc-ldoption is used to check if $(CC) when used to link object files
- supports the given option. An optional second option may be
- specified if first option are not supported.
-
- Example:
- #arch/x86/kernel/Makefile
- vsyscall-flags += $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
-
- In the above example, vsyscall-flags will be assigned the option
- -Wl$(comma)--hash-style=sysv if it is supported by $(CC).
- The second argument is optional, and if supplied will be used
- if first argument is not supported.
-
as-instr
as-instr checks if the assembler reports a specific instruction
and then outputs either option1 or option2
diff --git a/Documentation/networking/device_drivers/index.rst b/Documentation/networking/device_drivers/index.rst
new file mode 100644
index 000000000000..75fa537763a4
--- /dev/null
+++ b/Documentation/networking/device_drivers/index.rst
@@ -0,0 +1,30 @@
+.. SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+
+Vendor Device Drivers
+=====================
+
+Contents:
+
+.. toctree::
+ :maxdepth: 2
+
+ freescale/dpaa2/index
+ intel/e100
+ intel/e1000
+ intel/e1000e
+ intel/fm10k
+ intel/igb
+ intel/igbvf
+ intel/ixgb
+ intel/ixgbe
+ intel/ixgbevf
+ intel/i40e
+ intel/iavf
+ intel/ice
+
+.. only:: subproject
+
+ Indices
+ =======
+
+ * :ref:`genindex`
diff --git a/Documentation/networking/index.rst b/Documentation/networking/index.rst
index f390fe3cfdfb..a46fca264bee 100644
--- a/Documentation/networking/index.rst
+++ b/Documentation/networking/index.rst
@@ -11,19 +11,7 @@ Contents:
batman-adv
can
can_ucan_protocol
- device_drivers/freescale/dpaa2/index
- device_drivers/intel/e100
- device_drivers/intel/e1000
- device_drivers/intel/e1000e
- device_drivers/intel/fm10k
- device_drivers/intel/igb
- device_drivers/intel/igbvf
- device_drivers/intel/ixgb
- device_drivers/intel/ixgbe
- device_drivers/intel/ixgbevf
- device_drivers/intel/i40e
- device_drivers/intel/iavf
- device_drivers/intel/ice
+ device_drivers/index
dsa/index
devlink-info-versions
ieee802154
@@ -40,6 +28,8 @@ Contents:
checksum-offloads
segmentation-offloads
scaling
+ tls
+ tls-offload
.. only:: subproject
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 725b8bea58a7..14fe93049d28 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -560,10 +560,10 @@ tcp_comp_sack_delay_ns - LONG INTEGER
Default : 1,000,000 ns (1 ms)
tcp_comp_sack_nr - INTEGER
- Max numer of SACK that can be compressed.
+ Max number of SACK that can be compressed.
Using 0 disables SACK compression.
- Detault : 44
+ Default : 44
tcp_slow_start_after_idle - BOOLEAN
If set, provide RFC2861 behavior and time out the congestion
diff --git a/Documentation/networking/segmentation-offloads.rst b/Documentation/networking/segmentation-offloads.rst
index 89d1ee933e9f..085e8fab03fd 100644
--- a/Documentation/networking/segmentation-offloads.rst
+++ b/Documentation/networking/segmentation-offloads.rst
@@ -18,7 +18,7 @@ The following technologies are described:
* Generic Segmentation Offload - GSO
* Generic Receive Offload - GRO
* Partial Generic Segmentation Offload - GSO_PARTIAL
- * SCTP accelleration with GSO - GSO_BY_FRAGS
+ * SCTP acceleration with GSO - GSO_BY_FRAGS
TCP Segmentation Offload
@@ -148,7 +148,7 @@ that the IPv4 ID field is incremented in the case that a given header does
not have the DF bit set.
-SCTP accelleration with GSO
+SCTP acceleration with GSO
===========================
SCTP - despite the lack of hardware support - can still take advantage of
diff --git a/Documentation/networking/tls-offload-layers.svg b/Documentation/networking/tls-offload-layers.svg
new file mode 100644
index 000000000000..cf72f05dbb21
--- /dev/null
+++ b/Documentation/networking/tls-offload-layers.svg
@@ -0,0 +1 @@
+<svg version="1.1" viewBox="0.0 0.0 460.0 500.0" fill="none" stroke="none" stroke-linecap="square" stroke-miterlimit="10" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"><clipPath id="p.0"><path d="m0 0l960.0 0l0 720.0l-960.0 0l0 -720.0z" clip-rule="nonzero"/></clipPath><g clip-path="url(#p.0)"><path fill="#000000" fill-opacity="0.0" d="m0 0l960.0 0l0 720.0l-960.0 0z" fill-rule="evenodd"/><path fill="#cfe2f3" d="m117.02887 0l72.28346 0l0 40.25197l-72.28346 0z" fill-rule="evenodd"/><path stroke="#000000" stroke-width="1.0" stroke-linejoin="round" stroke-linecap="butt" d="m117.02887 0l72.28346 0l0 40.25197l-72.28346 0z" fill-rule="evenodd"/><path fill="#000000" d="m135.71944 27.045982l0 -9.671875l1.46875 0l0 1.46875q0.5625 -1.03125 1.03125 -1.359375q0.484375 -0.328125 1.0625 -0.328125q0.828125 0 1.6875 0.53125l-0.5625 1.515625q-0.609375 -0.359375 -1.203125 -0.359375q-0.546875 0 -0.96875 0.328125q-0.421875 0.328125 -0.609375 0.890625q-0.28125 0.875 -0.28125 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new file mode 100644
index 000000000000..10e17d91f70c
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diff --git a/Documentation/networking/tls-offload.rst b/Documentation/networking/tls-offload.rst
new file mode 100644
index 000000000000..cb85af559dff
--- /dev/null
+++ b/Documentation/networking/tls-offload.rst
@@ -0,0 +1,482 @@
+.. SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+
+==================
+Kernel TLS offload
+==================
+
+Kernel TLS operation
+====================
+
+Linux kernel provides TLS connection offload infrastructure. Once a TCP
+connection is in ``ESTABLISHED`` state user space can enable the TLS Upper
+Layer Protocol (ULP) and install the cryptographic connection state.
+For details regarding the user-facing interface refer to the TLS
+documentation in :ref:`Documentation/networking/tls.rst <kernel_tls>`.
+
+``ktls`` can operate in three modes:
+
+ * Software crypto mode (``TLS_SW``) - CPU handles the cryptography.
+ In most basic cases only crypto operations synchronous with the CPU
+ can be used, but depending on calling context CPU may utilize
+ asynchronous crypto accelerators. The use of accelerators introduces extra
+ latency on socket reads (decryption only starts when a read syscall
+ is made) and additional I/O load on the system.
+ * Packet-based NIC offload mode (``TLS_HW``) - the NIC handles crypto
+ on a packet by packet basis, provided the packets arrive in order.
+ This mode integrates best with the kernel stack and is described in detail
+ in the remaining part of this document
+ (``ethtool`` flags ``tls-hw-tx-offload`` and ``tls-hw-rx-offload``).
+ * Full TCP NIC offload mode (``TLS_HW_RECORD``) - mode of operation where
+ NIC driver and firmware replace the kernel networking stack
+ with its own TCP handling, it is not usable in production environments
+ making use of the Linux networking stack for example any firewalling
+ abilities or QoS and packet scheduling (``ethtool`` flag ``tls-hw-record``).
+
+The operation mode is selected automatically based on device configuration,
+offload opt-in or opt-out on per-connection basis is not currently supported.
+
+TX
+--
+
+At a high level user write requests are turned into a scatter list, the TLS ULP
+intercepts them, inserts record framing, performs encryption (in ``TLS_SW``
+mode) and then hands the modified scatter list to the TCP layer. From this
+point on the TCP stack proceeds as normal.
+
+In ``TLS_HW`` mode the encryption is not performed in the TLS ULP.
+Instead packets reach a device driver, the driver will mark the packets
+for crypto offload based on the socket the packet is attached to,
+and send them to the device for encryption and transmission.
+
+RX
+--
+
+On the receive side if the device handled decryption and authentication
+successfully, the driver will set the decrypted bit in the associated
+:c:type:`struct sk_buff <sk_buff>`. The packets reach the TCP stack and
+are handled normally. ``ktls`` is informed when data is queued to the socket
+and the ``strparser`` mechanism is used to delineate the records. Upon read
+request, records are retrieved from the socket and passed to decryption routine.
+If device decrypted all the segments of the record the decryption is skipped,
+otherwise software path handles decryption.
+
+.. kernel-figure:: tls-offload-layers.svg
+ :alt: TLS offload layers
+ :align: center
+ :figwidth: 28em
+
+ Layers of Kernel TLS stack
+
+Device configuration
+====================
+
+During driver initialization device sets the ``NETIF_F_HW_TLS_RX`` and
+``NETIF_F_HW_TLS_TX`` features and installs its
+:c:type:`struct tlsdev_ops <tlsdev_ops>`
+pointer in the :c:member:`tlsdev_ops` member of the
+:c:type:`struct net_device <net_device>`.
+
+When TLS cryptographic connection state is installed on a ``ktls`` socket
+(note that it is done twice, once for RX and once for TX direction,
+and the two are completely independent), the kernel checks if the underlying
+network device is offload-capable and attempts the offload. In case offload
+fails the connection is handled entirely in software using the same mechanism
+as if the offload was never tried.
+
+Offload request is performed via the :c:member:`tls_dev_add` callback of
+:c:type:`struct tlsdev_ops <tlsdev_ops>`:
+
+.. code-block:: c
+
+ int (*tls_dev_add)(struct net_device *netdev, struct sock *sk,
+ enum tls_offload_ctx_dir direction,
+ struct tls_crypto_info *crypto_info,
+ u32 start_offload_tcp_sn);
+
+``direction`` indicates whether the cryptographic information is for
+the received or transmitted packets. Driver uses the ``sk`` parameter
+to retrieve the connection 5-tuple and socket family (IPv4 vs IPv6).
+Cryptographic information in ``crypto_info`` includes the key, iv, salt
+as well as TLS record sequence number. ``start_offload_tcp_sn`` indicates
+which TCP sequence number corresponds to the beginning of the record with
+sequence number from ``crypto_info``. The driver can add its state
+at the end of kernel structures (see :c:member:`driver_state` members
+in ``include/net/tls.h``) to avoid additional allocations and pointer
+dereferences.
+
+TX
+--
+
+After TX state is installed, the stack guarantees that the first segment
+of the stream will start exactly at the ``start_offload_tcp_sn`` sequence
+number, simplifying TCP sequence number matching.
+
+TX offload being fully initialized does not imply that all segments passing
+through the driver and which belong to the offloaded socket will be after
+the expected sequence number and will have kernel record information.
+In particular, already encrypted data may have been queued to the socket
+before installing the connection state in the kernel.
+
+RX
+--
+
+In RX direction local networking stack has little control over the segmentation,
+so the initial records' TCP sequence number may be anywhere inside the segment.
+
+Normal operation
+================
+
+At the minimum the device maintains the following state for each connection, in
+each direction:
+
+ * crypto secrets (key, iv, salt)
+ * crypto processing state (partial blocks, partial authentication tag, etc.)
+ * record metadata (sequence number, processing offset and length)
+ * expected TCP sequence number
+
+There are no guarantees on record length or record segmentation. In particular
+segments may start at any point of a record and contain any number of records.
+Assuming segments are received in order, the device should be able to perform
+crypto operations and authentication regardless of segmentation. For this
+to be possible device has to keep small amount of segment-to-segment state.
+This includes at least:
+
+ * partial headers (if a segment carried only a part of the TLS header)
+ * partial data block
+ * partial authentication tag (all data had been seen but part of the
+ authentication tag has to be written or read from the subsequent segment)
+
+Record reassembly is not necessary for TLS offload. If the packets arrive
+in order the device should be able to handle them separately and make
+forward progress.
+
+TX
+--
+
+The kernel stack performs record framing reserving space for the authentication
+tag and populating all other TLS header and tailer fields.
+
+Both the device and the driver maintain expected TCP sequence numbers
+due to the possibility of retransmissions and the lack of software fallback
+once the packet reaches the device.
+For segments passed in order, the driver marks the packets with
+a connection identifier (note that a 5-tuple lookup is insufficient to identify
+packets requiring HW offload, see the :ref:`5tuple_problems` section)
+and hands them to the device. The device identifies the packet as requiring
+TLS handling and confirms the sequence number matches its expectation.
+The device performs encryption and authentication of the record data.
+It replaces the authentication tag and TCP checksum with correct values.
+
+RX
+--
+
+Before a packet is DMAed to the host (but after NIC's embedded switching
+and packet transformation functions) the device validates the Layer 4
+checksum and performs a 5-tuple lookup to find any TLS connection the packet
+may belong to (technically a 4-tuple
+lookup is sufficient - IP addresses and TCP port numbers, as the protocol
+is always TCP). If connection is matched device confirms if the TCP sequence
+number is the expected one and proceeds to TLS handling (record delineation,
+decryption, authentication for each record in the packet). The device leaves
+the record framing unmodified, the stack takes care of record decapsulation.
+Device indicates successful handling of TLS offload in the per-packet context
+(descriptor) passed to the host.
+
+Upon reception of a TLS offloaded packet, the driver sets
+the :c:member:`decrypted` mark in :c:type:`struct sk_buff <sk_buff>`
+corresponding to the segment. Networking stack makes sure decrypted
+and non-decrypted segments do not get coalesced (e.g. by GRO or socket layer)
+and takes care of partial decryption.
+
+Resync handling
+===============
+
+In presence of packet drops or network packet reordering, the device may lose
+synchronization with the TLS stream, and require a resync with the kernel's
+TCP stack.
+
+Note that resync is only attempted for connections which were successfully
+added to the device table and are in TLS_HW mode. For example,
+if the table was full when cryptographic state was installed in the kernel,
+such connection will never get offloaded. Therefore the resync request
+does not carry any cryptographic connection state.
+
+TX
+--
+
+Segments transmitted from an offloaded socket can get out of sync
+in similar ways to the receive side-retransmissions - local drops
+are possible, though network reorders are not.
+
+Whenever an out of order segment is transmitted the driver provides
+the device with enough information to perform cryptographic operations.
+This means most likely that the part of the record preceding the current
+segment has to be passed to the device as part of the packet context,
+together with its TCP sequence number and TLS record number. The device
+can then initialize its crypto state, process and discard the preceding
+data (to be able to insert the authentication tag) and move onto handling
+the actual packet.
+
+In this mode depending on the implementation the driver can either ask
+for a continuation with the crypto state and the new sequence number
+(next expected segment is the one after the out of order one), or continue
+with the previous stream state - assuming that the out of order segment
+was just a retransmission. The former is simpler, and does not require
+retransmission detection therefore it is the recommended method until
+such time it is proven inefficient.
+
+RX
+--
+
+A small amount of RX reorder events may not require a full resynchronization.
+In particular the device should not lose synchronization
+when record boundary can be recovered:
+
+.. kernel-figure:: tls-offload-reorder-good.svg
+ :alt: reorder of non-header segment
+ :align: center
+
+ Reorder of non-header segment
+
+Green segments are successfully decrypted, blue ones are passed
+as received on wire, red stripes mark start of new records.
+
+In above case segment 1 is received and decrypted successfully.
+Segment 2 was dropped so 3 arrives out of order. The device knows
+the next record starts inside 3, based on record length in segment 1.
+Segment 3 is passed untouched, because due to lack of data from segment 2
+the remainder of the previous record inside segment 3 cannot be handled.
+The device can, however, collect the authentication algorithm's state
+and partial block from the new record in segment 3 and when 4 and 5
+arrive continue decryption. Finally when 2 arrives it's completely outside
+of expected window of the device so it's passed as is without special
+handling. ``ktls`` software fallback handles the decryption of record
+spanning segments 1, 2 and 3. The device did not get out of sync,
+even though two segments did not get decrypted.
+
+Kernel synchronization may be necessary if the lost segment contained
+a record header and arrived after the next record header has already passed:
+
+.. kernel-figure:: tls-offload-reorder-bad.svg
+ :alt: reorder of header segment
+ :align: center
+
+ Reorder of segment with a TLS header
+
+In this example segment 2 gets dropped, and it contains a record header.
+Device can only detect that segment 4 also contains a TLS header
+if it knows the length of the previous record from segment 2. In this case
+the device will lose synchronization with the stream.
+
+When the device gets out of sync and the stream reaches TCP sequence
+numbers more than a max size record past the expected TCP sequence number,
+the device starts scanning for a known header pattern. For example
+for TLS 1.2 and TLS 1.3 subsequent bytes of value ``0x03 0x03`` occur
+in the SSL/TLS version field of the header. Once pattern is matched
+the device continues attempting parsing headers at expected locations
+(based on the length fields at guessed locations).
+Whenever the expected location does not contain a valid header the scan
+is restarted.
+
+When the header is matched the device sends a confirmation request
+to the kernel, asking if the guessed location is correct (if a TLS record
+really starts there), and which record sequence number the given header had.
+The kernel confirms the guessed location was correct and tells the device
+the record sequence number. Meanwhile, the device had been parsing
+and counting all records since the just-confirmed one, it adds the number
+of records it had seen to the record number provided by the kernel.
+At this point the device is in sync and can resume decryption at next
+segment boundary.
+
+In a pathological case the device may latch onto a sequence of matching
+headers and never hear back from the kernel (there is no negative
+confirmation from the kernel). The implementation may choose to periodically
+restart scan. Given how unlikely falsely-matching stream is, however,
+periodic restart is not deemed necessary.
+
+Special care has to be taken if the confirmation request is passed
+asynchronously to the packet stream and record may get processed
+by the kernel before the confirmation request.
+
+Error handling
+==============
+
+TX
+--
+
+Packets may be redirected or rerouted by the stack to a different
+device than the selected TLS offload device. The stack will handle
+such condition using the :c:func:`sk_validate_xmit_skb` helper
+(TLS offload code installs :c:func:`tls_validate_xmit_skb` at this hook).
+Offload maintains information about all records until the data is
+fully acknowledged, so if skbs reach the wrong device they can be handled
+by software fallback.
+
+Any device TLS offload handling error on the transmission side must result
+in the packet being dropped. For example if a packet got out of order
+due to a bug in the stack or the device, reached the device and can't
+be encrypted such packet must be dropped.
+
+RX
+--
+
+If the device encounters any problems with TLS offload on the receive
+side it should pass the packet to the host's networking stack as it was
+received on the wire.
+
+For example authentication failure for any record in the segment should
+result in passing the unmodified packet to the software fallback. This means
+packets should not be modified "in place". Splitting segments to handle partial
+decryption is not advised. In other words either all records in the packet
+had been handled successfully and authenticated or the packet has to be passed
+to the host's stack as it was on the wire (recovering original packet in the
+driver if device provides precise error is sufficient).
+
+The Linux networking stack does not provide a way of reporting per-packet
+decryption and authentication errors, packets with errors must simply not
+have the :c:member:`decrypted` mark set.
+
+A packet should also not be handled by the TLS offload if it contains
+incorrect checksums.
+
+Performance metrics
+===================
+
+TLS offload can be characterized by the following basic metrics:
+
+ * max connection count
+ * connection installation rate
+ * connection installation latency
+ * total cryptographic performance
+
+Note that each TCP connection requires a TLS session in both directions,
+the performance may be reported treating each direction separately.
+
+Max connection count
+--------------------
+
+The number of connections device can support can be exposed via
+``devlink resource`` API.
+
+Total cryptographic performance
+-------------------------------
+
+Offload performance may depend on segment and record size.
+
+Overload of the cryptographic subsystem of the device should not have
+significant performance impact on non-offloaded streams.
+
+Statistics
+==========
+
+Following minimum set of TLS-related statistics should be reported
+by the driver:
+
+ * ``rx_tls_decrypted`` - number of successfully decrypted TLS segments
+ * ``tx_tls_encrypted`` - number of in-order TLS segments passed to device
+ for encryption
+ * ``tx_tls_ooo`` - number of TX packets which were part of a TLS stream
+ but did not arrive in the expected order
+ * ``tx_tls_drop_no_sync_data`` - number of TX packets dropped because
+ they arrived out of order and associated record could not be found
+ (see also :ref:`pre_tls_data`)
+
+Notable corner cases, exceptions and additional requirements
+============================================================
+
+.. _5tuple_problems:
+
+5-tuple matching limitations
+----------------------------
+
+The device can only recognize received packets based on the 5-tuple
+of the socket. Current ``ktls`` implementation will not offload sockets
+routed through software interfaces such as those used for tunneling
+or virtual networking. However, many packet transformations performed
+by the networking stack (most notably any BPF logic) do not require
+any intermediate software device, therefore a 5-tuple match may
+consistently miss at the device level. In such cases the device
+should still be able to perform TX offload (encryption) and should
+fallback cleanly to software decryption (RX).
+
+Out of order
+------------
+
+Introducing extra processing in NICs should not cause packets to be
+transmitted or received out of order, for example pure ACK packets
+should not be reordered with respect to data segments.
+
+Ingress reorder
+---------------
+
+A device is permitted to perform packet reordering for consecutive
+TCP segments (i.e. placing packets in the correct order) but any form
+of additional buffering is disallowed.
+
+Coexistence with standard networking offload features
+-----------------------------------------------------
+
+Offloaded ``ktls`` sockets should support standard TCP stack features
+transparently. Enabling device TLS offload should not cause any difference
+in packets as seen on the wire.
+
+Transport layer transparency
+----------------------------
+
+The device should not modify any packet headers for the purpose
+of the simplifying TLS offload.
+
+The device should not depend on any packet headers beyond what is strictly
+necessary for TLS offload.
+
+Segment drops
+-------------
+
+Dropping packets is acceptable only in the event of catastrophic
+system errors and should never be used as an error handling mechanism
+in cases arising from normal operation. In other words, reliance
+on TCP retransmissions to handle corner cases is not acceptable.
+
+TLS device features
+-------------------
+
+Drivers should ignore the changes to TLS the device feature flags.
+These flags will be acted upon accordingly by the core ``ktls`` code.
+TLS device feature flags only control adding of new TLS connection
+offloads, old connections will remain active after flags are cleared.
+
+Known bugs
+==========
+
+skb_orphan() leaks clear text
+-----------------------------
+
+Currently drivers depend on the :c:member:`sk` member of
+:c:type:`struct sk_buff <sk_buff>` to identify segments requiring
+encryption. Any operation which removes or does not preserve the socket
+association such as :c:func:`skb_orphan` or :c:func:`skb_clone`
+will cause the driver to miss the packets and lead to clear text leaks.
+
+Redirects leak clear text
+-------------------------
+
+In the RX direction, if segment has already been decrypted by the device
+and it gets redirected or mirrored - clear text will be transmitted out.
+
+.. _pre_tls_data:
+
+Transmission of pre-TLS data
+----------------------------
+
+User can enqueue some already encrypted and framed records before enabling
+``ktls`` on the socket. Those records have to get sent as they are. This is
+perfectly easy to handle in the software case - such data will be waiting
+in the TCP layer, TLS ULP won't see it. In the offloaded case when pre-queued
+segment reaches transmission point it appears to be out of order (before the
+expected TCP sequence number) and the stack does not have a record information
+associated.
+
+All segments without record information cannot, however, be assumed to be
+pre-queued data, because a race condition exists between TCP stack queuing
+a retransmission, the driver seeing the retransmission and TCP ACK arriving
+for the retransmitted data.
diff --git a/Documentation/networking/tls.txt b/Documentation/networking/tls.rst
index 58b5ef75f1b7..5bcbf75e2025 100644
--- a/Documentation/networking/tls.txt
+++ b/Documentation/networking/tls.rst
@@ -1,3 +1,9 @@
+.. _kernel_tls:
+
+==========
+Kernel TLS
+==========
+
Overview
========
@@ -12,6 +18,8 @@ Creating a TLS connection
First create a new TCP socket and set the TLS ULP.
+.. code-block:: c
+
sock = socket(AF_INET, SOCK_STREAM, 0);
setsockopt(sock, SOL_TCP, TCP_ULP, "tls", sizeof("tls"));
@@ -21,6 +29,8 @@ handshake is complete, we have all the parameters required to move the
data-path to the kernel. There is a separate socket option for moving
the transmit and the receive into the kernel.
+.. code-block:: c
+
/* From linux/tls.h */
struct tls_crypto_info {
unsigned short version;
@@ -58,6 +68,8 @@ After setting the TLS_TX socket option all application data sent over this
socket is encrypted using TLS and the parameters provided in the socket option.
For example, we can send an encrypted hello world record as follows:
+.. code-block:: c
+
const char *msg = "hello world\n";
send(sock, msg, strlen(msg));
@@ -67,6 +79,8 @@ to the encrypted kernel send buffer if possible.
The sendfile system call will send the file's data over TLS records of maximum
length (2^14).
+.. code-block:: c
+
file = open(filename, O_RDONLY);
fstat(file, &stat);
sendfile(sock, file, &offset, stat.st_size);
@@ -89,6 +103,8 @@ After setting the TLS_RX socket option, all recv family socket calls
are decrypted using TLS parameters provided. A full TLS record must
be received before decryption can happen.
+.. code-block:: c
+
char buffer[16384];
recv(sock, buffer, 16384);
@@ -97,12 +113,12 @@ large enough, and no additional allocations occur. If the userspace
buffer is too small, data is decrypted in the kernel and copied to
userspace.
-EINVAL is returned if the TLS version in the received message does not
+``EINVAL`` is returned if the TLS version in the received message does not
match the version passed in setsockopt.
-EMSGSIZE is returned if the received message is too big.
+``EMSGSIZE`` is returned if the received message is too big.
-EBADMSG is returned if decryption failed for any other reason.
+``EBADMSG`` is returned if decryption failed for any other reason.
Send TLS control messages
-------------------------
@@ -113,9 +129,11 @@ These messages can be sent over the socket by providing the TLS record type
via a CMSG. For example the following function sends @data of @length bytes
using a record of type @record_type.
-/* send TLS control message using record_type */
+.. code-block:: c
+
+ /* send TLS control message using record_type */
static int klts_send_ctrl_message(int sock, unsigned char record_type,
- void *data, size_t length)
+ void *data, size_t length)
{
struct msghdr msg = {0};
int cmsg_len = sizeof(record_type);
@@ -151,6 +169,8 @@ type passed via cmsg. If no cmsg buffer is provided, an error is
returned if a control message is received. Data messages may be
received without a cmsg buffer set.
+.. code-block:: c
+
char buffer[16384];
char cmsg[CMSG_SPACE(sizeof(unsigned char))];
struct msghdr msg = {0};
@@ -186,12 +206,10 @@ Integrating in to userspace TLS library
At a high level, the kernel TLS ULP is a replacement for the record
layer of a userspace TLS library.
-A patchset to OpenSSL to use ktls as the record layer is here:
-
-https://github.com/Mellanox/openssl/commits/tls_rx2
-
-An example of calling send directly after a handshake using
-gnutls. Since it doesn't implement a full record layer, control
-messages are not supported:
+A patchset to OpenSSL to use ktls as the record layer is
+`here <https://github.com/Mellanox/openssl/commits/tls_rx2>`_.
-https://github.com/ktls/af_ktls-tool/commits/RX
+`An example <https://github.com/ktls/af_ktls-tool/commits/RX>`_
+of calling send directly after a handshake using gnutls.
+Since it doesn't implement a full record layer, control
+messages are not supported.
diff --git a/Documentation/usb/rio.txt b/Documentation/usb/rio.txt
index ca9adcf56355..ea73475471db 100644
--- a/Documentation/usb/rio.txt
+++ b/Documentation/usb/rio.txt
@@ -76,70 +76,30 @@ Additional Information and userspace tools
Requirements
============
-A host with a USB port. Ideally, either a UHCI (Intel) or OHCI
-(Compaq and others) hardware port should work.
+A host with a USB port running a Linux kernel with RIO 500 support enabled.
-A Linux development kernel (2.3.x) with USB support enabled or a
-backported version to linux-2.2.x. See http://www.linux-usb.org for
-more information on accomplishing this.
+The driver is a module called rio500, which should be automatically loaded
+as you plug in your device. If that fails you can manually load it with
-A Linux kernel with RIO 500 support enabled.
+ modprobe rio500
-'lspci' which is only needed to determine the type of USB hardware
-available in your machine.
-
-Configuration
-
-Using `lspci -v`, determine the type of USB hardware available.
-
- If you see something like::
-
- USB Controller: ......
- Flags: .....
- I/O ports at ....
-
- Then you have a UHCI based controller.
-
- If you see something like::
-
- USB Controller: .....
- Flags: ....
- Memory at .....
-
- Then you have a OHCI based controller.
-
-Using `make menuconfig` or your preferred method for configuring the
-kernel, select 'Support for USB', 'OHCI/UHCI' depending on your
-hardware (determined from the steps above), 'USB Diamond Rio500 support', and
-'Preliminary USB device filesystem'. Compile and install the modules
-(you may need to execute `depmod -a` to update the module
-dependencies).
-
-Add a device for the USB rio500::
+Udev should automatically create a device node as soon as plug in your device.
+If that fails, you can manually add a device for the USB rio500::
mknod /dev/usb/rio500 c 180 64
-Set appropriate permissions for /dev/usb/rio500 (don't forget about
-group and world permissions). Both read and write permissions are
+In that case, set appropriate permissions for /dev/usb/rio500 (don't forget
+about group and world permissions). Both read and write permissions are
required for proper operation.
-Load the appropriate modules (if compiled as modules):
-
- OHCI::
-
- modprobe usbcore
- modprobe usb-ohci
- modprobe rio500
-
- UHCI::
-
- modprobe usbcore
- modprobe usb-uhci (or uhci)
- modprobe rio500
-
That's it. The Rio500 Utils at: http://rio500.sourceforge.net should
be able to access the rio500.
+Limits
+======
+
+You can use only a single rio500 device at a time with your computer.
+
Bugs
====
diff --git a/Documentation/vm/hmm.rst b/Documentation/vm/hmm.rst
index ec1efa32af3c..7cdf7282e022 100644
--- a/Documentation/vm/hmm.rst
+++ b/Documentation/vm/hmm.rst
@@ -288,15 +288,17 @@ For instance if the device flags for device entries are:
WRITE (1 << 62)
Now let say that device driver wants to fault with at least read a range then
-it does set:
- range->default_flags = (1 << 63)
+it does set::
+
+ range->default_flags = (1 << 63);
range->pfn_flags_mask = 0;
and calls hmm_range_fault() as described above. This will fill fault all page
in the range with at least read permission.
Now let say driver wants to do the same except for one page in the range for
-which its want to have write. Now driver set:
+which its want to have write. Now driver set::
+
range->default_flags = (1 << 63);
range->pfn_flags_mask = (1 << 62);
range->pfns[index_of_write] = (1 << 62);