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* devlink: document region snapshot triggering from userspaceJacob Keller2020-01-111-2/+8
| | | | | | | | | Now that devlink regions can be triggered via DEVLINK_CMD_REGION_TRIGGER, document this in the devlink-region.rst file. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* devlink: introduce devlink-dpipe.rst documentation fileJacob Keller2020-01-112-0/+253
| | | | | | | | | | | Primarily based on the DPIPE netdev conference paper, introduce a new file to document the dpipe interface. This likely needs further improvement, but is at least a good overall start. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* devlink: add a devlink-resource.rst documentation fileJacob Keller2020-01-112-0/+63
| | | | | | | | | | | Take the little bit of documentation for resources from various commit messages and combine it into a new devlink-resource.rst file. This could probably be expanded on even further by someone with more knowledge of how the devlink resources work. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* devlink: rename and expand devlink-trap-netdevsim.rstJacob Keller2020-01-114-22/+74
| | | | | | | | | | Rename the trap-specific netdevimsim.rst file, and expand it to include documentation of all the devlink features currently implemented by the netdevsim driver code. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Cc: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* devlink: add documentation for ionic device driverJacob Keller2020-01-112-0/+30
| | | | | | | | | | The IONIC device driver allocates a devlink and reports versions. Add documentation for this driver. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Cc: Shannon Nelson <snelson@pensando.io> Acked-by: Shannon Nelson <snelson@pensandi.io> Signed-off-by: David S. Miller <davem@davemloft.net>
* devlink: add a file documenting devlink regionsJacob Keller2020-01-113-0/+68
| | | | | | | | | Also document the regions created by the mlx4 driver. This is currently the only in-tree driver that creates devlink region snapshots. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Cc: Tariq Toukan <tariqt@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* devlink: add a driver-specific file for the qed driverJacob Keller2020-01-112-0/+27
| | | | | | | | | | | The qed driver recently added devlink support with a single devlink parameter. Add a driver-specific file to document the devlink features that the qed driver supports. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Cc: Ariel Elior <aelior@marvell.com> Cc: GR-everest-linux-l2@marvell.com Signed-off-by: David S. Miller <davem@davemloft.net>
* devlink: add parameter documentation for the mlx4 driverJacob Keller2020-01-112-0/+44
| | | | | | | | | | | | The mlx5 and mlxsw drivers have driver-specific documentation for the devlink features they support. No such file was added for mlx4. Add a file to document the mlx4 devlink support. Initially it contains only the devlink parameters. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Cc: Tariq Toukan <tariqt@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* devlink: document info versions for each driverJacob Keller2020-01-113-0/+84
| | | | | | | | | | | | | | | Add the set of info versions reported by each device driver, including a description of what the version represents, and what modes (fixed, running, stored) it reports. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Cc: Tariq Toukan <tariqt@mellanox.com> Cc: Saeed Mahameed <saeedm@mellanox.com> Cc: Leon Romanovsky <leonro@mellanox.com> Cc: Michael Chan <michael.chan@broadcom.com> Cc: Jiri Pirko <jiri@mellanox.com> Cc: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* devlink: convert driver-specific files to reStructuredTextJacob Keller2020-01-1114-69/+221
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Several drivers document what parameters they support in a devlink-params-*.txt file. This file is supposed to contain both the list of generic parameters implemented by the driver, as well as a list of driver-specific parameters and their descriptions. It would also be good if the driver documentation included other driver-specific implementations, such as info versions, devlink regions, and so forth. Convert all of these documentation files to reStructuredText, and rename them to just the driver name. Future changes will include other driver-specific implementations. Each file will contain a table for the generic parameters implemented, as well as a separate table for the driver-specific parameters. Future sections such as for devlink info versions will be added to these files. This avoids creating additional devlink-<feature>-<driver> files for each devlink feature, reducing clutter in the documentation folder. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Cc: Tariq Toukan <tariqt@mellanox.com> Cc: Saeed Mahameed <saeedm@mellanox.com> Cc: Leon Romanovsky <leonro@mellanox.com> Cc: Michael Chan <michael.chan@broadcom.com> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Vivien Didelot <vivien.didelot@gmail.com> Cc: Jiri Pirko <jiri@mellanox.com> Cc: Ido Schimmel <idosch@mellanox.com> Cc: Jakub Kicinski <jakub.kicinski@netronome.com> Cc: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* devlink: mention reloading in devlink-params.rstJacob Keller2020-01-111-0/+7
| | | | | | | | Mention that drivers must support devlink-reload in order for driverinit parameters to function properly Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* devlink: add documentation for generic devlink parametersJacob Keller2020-01-111-0/+11
| | | | | | | | A few generic devlink parameters have been added, but never documented. Fix that now. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* devlink: convert devlink-params.txt to reStructuredTextJacob Keller2020-01-113-71/+91
| | | | | | | | Convert the generic parameters descriptions into the reStructuredText format. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* devlink: rename devlink-info-versions.rst and add a headerJacob Keller2020-01-113-65/+95
| | | | | | | | | | | | Rename the devlink-info-versions.rst file to a plain devlink-info.rst file. Add additional paragraphs explaining what devlink-info is for, and the expectation that drivers use the generic names where plausible. Note that drivers which use non-standard info version names ought to document these in a driver-specific info-versions.rst file. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* devlink: convert devlink-health.txt to rst formatJacob Keller2020-01-113-86/+115
| | | | | | | | | | | Update the devlink-health documentation to use the newer ReStructuredText format. Note that it's unclear what OOB stood for, and it has been left as-is without a proper first-use expansion of the acronym. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* devlink: move devlink documentation to subfolderJacob Keller2020-01-1113-3/+15
| | | | | | | | Combine the documentation for devlink into a subfolder, and provide an index.rst file that can be used to generally describe devlink. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netDavid S. Miller2020-01-092-3/+3
|\ | | | | | | | | | | | | | | The ungrafting from PRIO bug fixes in net, when merged into net-next, merge cleanly but create a build failure. The resolution used here is from Petr Machata. Signed-off-by: David S. Miller <davem@davemloft.net>
| * doc/net: Update git https URLs in netdev-FAQ documentationJesper Dangaard Brouer2020-01-031-2/+2
| | | | | | | | | | | | | | | | | | DaveM's git tree have been moved into a named subdir 'netdev' to deal with allowing Jakub Kicinski to help co-maintain the trees. Link: https://www.kernel.org/doc/html/latest/networking/netdev-FAQ.html Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * net: Correct type of tcp_syncookies sysctl.David S. Miller2020-01-031-1/+1
| | | | | | | | | | | | | | It can take on the values of '0', '1', and '2' and thus is not a boolean. Signed-off-by: David S. Miller <davem@davemloft.net>
* | Documentation: networking: Add stmmac to device drivers listJose Abreu2020-01-071-0/+1
| | | | | | | | | | | | | | Add the stmmac RST file to the index. Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | Documentation: networking: Convert stmmac documentation to RST formatJose Abreu2020-01-072-401/+697
| | | | | | | | | | | | | | | | | | | | Convert the documentation of the driver to RST format and delete the old txt and old information that no longer applies. Also, add some new information. Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: phylink: add support for polling MAC PCSVladimir Oltean2020-01-061-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Some MAC PCS blocks are unable to provide interrupts when their status changes. As we already have support in phylink for polling status, use this to provide a hook for MACs to enable polling mode. The patch idea was picked up from Russell King's suggestion on the macb phylink patch thread here [0] but the implementation was changed. Instead of introducing a new phylink_start_poll() function, which would make the implementation cumbersome for common PHYLINK implementations for multiple types of devices, like DSA, just add a boolean property to the phylink_config structure, which is just as backwards-compatible. https://lkml.org/lkml/2019/12/16/603 Suggested-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: phy: add PHY_INTERFACE_MODE_10GBASERRussell King2020-01-061-0/+18
| | | | | | | | | | | | | | | | | | | | Recent discussion has revealed that the use of PHY_INTERFACE_MODE_10GKR is incorrect. Add a 10GBASE-R definition, document both the -R and -KR versions, and the fact that 10GKR was used incorrectly. Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netDavid S. Miller2019-12-311-6/+0
|\| | | | | | | | | | | | | Simple overlapping changes in bpf land wrt. bpf_helper_defs.h handling. Signed-off-by: David S. Miller <davem@davemloft.net>
| * Documentation: net: dsa: sja1105: Remove text about taprio base-time limitationVladimir Oltean2019-12-311-6/+0
| | | | | | | | | | | | | | | | | | Since commit 86db36a347b4 ("net: dsa: sja1105: Implement state machine for TAS with PTP clock source"), this paragraph is no longer true. So remove it. Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | ethtool: provide link state with LINKSTATE_GET requestMichal Kubecek2019-12-281-1/+32
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Implement LINKSTATE_GET netlink request to get link state information. At the moment, only link up flag as provided by ETHTOOL_GLINK ioctl command is returned. LINKSTATE_GET request can be used with NLM_F_DUMP (without device identification) to request the information for all devices in current network namespace providing the data. Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | ethtool: add LINKMODES_NTF notificationMichal Kubecek2019-12-281-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Send ETHTOOL_MSG_LINKMODES_NTF notification message whenever device link settings or advertised modes are modified using ETHTOOL_MSG_LINKMODES_SET netlink message or ETHTOOL_SLINKSETTINGS or ETHTOOL_SSET ioctl commands. The notification message has the same format as reply to LINKMODES_GET request. ETHTOOL_MSG_LINKMODES_SET netlink request only triggers the notification if there is a change but the ioctl command handlers do not check if there is an actual change and trigger the notification whenever the commands are executed. As all work is done by ethnl_default_notify() handler and callback functions introduced to handle LINKMODES_GET requests, all that remains is adding entries for ETHTOOL_MSG_LINKMODES_NTF into ethnl_notify_handlers and ethnl_default_notify_ops lookup tables and calls to ethtool_notify() where needed. Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | ethtool: set link modes related data with LINKMODES_SET requestMichal Kubecek2019-12-281-0/+27
| | | | | | | | | | | | | | | | | | | | | | | | Implement LINKMODES_SET netlink request to set advertised linkmodes and related attributes as ETHTOOL_SLINKSETTINGS and ETHTOOL_SSET commands do. The request allows setting autonegotiation flag, speed, duplex and advertised link modes. Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | ethtool: provide link mode information with LINKMODES_GET requestMichal Kubecek2019-12-281-0/+36
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Implement LINKMODES_GET netlink request to get link modes related information provided by ETHTOOL_GLINKSETTINGS and ETHTOOL_GSET ioctl commands. This request provides supported, advertised and peer advertised link modes, autonegotiation flag, speed and duplex. LINKMODES_GET request can be used with NLM_F_DUMP (without device identification) to request the information for all devices in current network namespace providing the data. Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | ethtool: add LINKINFO_NTF notificationMichal Kubecek2019-12-281-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Send ETHTOOL_MSG_LINKINFO_NTF notification message whenever device link settings are modified using ETHTOOL_MSG_LINKINFO_SET netlink message or ETHTOOL_SLINKSETTINGS or ETHTOOL_SSET ioctl commands. The notification message has the same format as reply to LINKINFO_GET request. ETHTOOL_MSG_LINKINFO_SET netlink request only triggers the notification if there is a change but the ioctl command handlers do not check if there is an actual change and trigger the notification whenever the commands are executed. As all work is done by ethnl_default_notify() handler and callback functions introduced to handle LINKINFO_GET requests, all that remains is adding entries for ETHTOOL_MSG_LINKINFO_NTF into ethnl_notify_handlers and ethnl_default_notify_ops lookup tables and calls to ethtool_notify() where needed. Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | ethtool: set link settings with LINKINFO_SET requestMichal Kubecek2019-12-281-2/+22
| | | | | | | | | | | | | | | | | | | | | | | | Implement LINKINFO_SET netlink request to set link settings queried by LINKINFO_GET message. Only physical port, phy MDIO address and MDI(-X) control can be set, attempt to modify MDI(-X) status and transceiver is rejected. Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | ethtool: provide link settings with LINKINFO_GET requestMichal Kubecek2019-12-281-2/+35
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Implement LINKINFO_GET netlink request to get basic link settings provided by ETHTOOL_GLINKSETTINGS and ETHTOOL_GSET ioctl commands. This request provides settings not directly related to autonegotiation and link mode selection: physical port, phy MDIO address, MDI(-X) status, MDI(-X) control and transceiver. LINKINFO_GET request can be used with NLM_F_DUMP (without device identification) to request the information for all devices in current network namespace providing the data. Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | ethtool: provide string sets with STRSET_GET requestMichal Kubecek2019-12-281-2/+73
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Requests a contents of one or more string sets, i.e. indexed arrays of strings; this information is provided by ETHTOOL_GSSET_INFO and ETHTOOL_GSTRINGS commands of ioctl interface. Unlike ioctl interface, all information can be retrieved with one request and mulitple string sets can be requested at once. There are three types of requests: - no NLM_F_DUMP, no device: get "global" stringsets - no NLM_F_DUMP, with device: get string sets related to the device - NLM_F_DUMP, no device: get device related string sets for all devices Client can request either all string sets of given type (global or device related) or only specific sets. With ETHTOOL_A_STRSET_COUNTS flag set, only set sizes (numbers of strings) are returned. Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | ethtool: netlink bitset handlingMichal Kubecek2019-12-281-0/+84
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The ethtool netlink code uses common framework for passing arbitrary length bit sets to allow future extensions. A bitset can be a list (only one bitmap) or can consist of value and mask pair (used e.g. when client want to modify only some bits). A bitset can use one of two formats: verbose (bit by bit) or compact. Verbose format consists of bitset size (number of bits), list flag and an array of bit nests, telling which bits are part of the list or which bits are in the mask and which of them are to be set. In requests, bits can be identified by index (position) or by name. In replies, kernel provides both index and name. Verbose format is suitable for "one shot" applications like standard ethtool command as it avoids the need to either keep bit names (e.g. link modes) in sync with kernel or having to add an extra roundtrip for string set request (e.g. for private flags). Compact format uses one (list) or two (value/mask) arrays of 32-bit words to store the bitmap(s). It is more suitable for long running applications (ethtool in monitor mode or network management daemons) which can retrieve the names once and then pass only compact bitmaps to save space. Userspace requests can use either format; ETHTOOL_FLAG_COMPACT_BITSETS flag in request header tells kernel which format to use in reply. Notifications always use compact format. As some code uses arrays of unsigned long for internal representation and some arrays of u32 (or even a single u32), two sets of parse/compose helpers are introduced. To avoid code duplication, helpers for unsigned long arrays are implemented as wrappers around helpers for u32 arrays. There are two reasons for this choice: (1) u32 arrays are more frequent in ethtool code and (2) unsigned long array can be always interpreted as an u32 array on little endian 64-bit and all 32-bit architectures while we would need special handling for odd number of u32 words in the opposite direction. Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | ethtool: introduce ethtool netlink interfaceMichal Kubecek2019-12-282-0/+217
| | | | | | | | | | | | | | | | | | | | | | | | | | Basic genetlink and init infrastructure for the netlink interface, register genetlink family "ethtool". Add CONFIG_ETHTOOL_NETLINK Kconfig option to make the build optional. Add initial overall interface description into Documentation/networking/ethtool-netlink.rst, further patches will add more detailed information. Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netDavid S. Miller2019-12-231-1/+1
|\| | | | | | | | | | | Mere overlapping changes in the conflicts here. Signed-off-by: David S. Miller <davem@davemloft.net>
| * Merge tag 'linux-can-fixes-for-5.5-20191208' of ↵David S. Miller2019-12-091-1/+1
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can Marc Kleine-Budde says: ==================== pull-request: can 2019-12-08 this is a pull request of 13 patches for net/master. The first two patches are by Dan Murphy. He adds himself as a maintainer to the m-can MMIO and tcan SPI driver. The next two patches the j1939 stack. The first one is by Oleksij Rempel and fixes a locking problem found by the syzbot, the second one is by me an fixes a mistake in the documentation. Srinivas Neeli fixes missing RX CAN packets on CANFD2.0 in the xilinx driver. Sean Nyekjaer fixes a possible deadlock in the the flexcan driver after suspend/resume. Joakim Zhang contributes two patches for the flexcan driver that fix problems with the low power enter/exit. The next 4 patches all target the tcan part of the m_can driver. Sean Nyekjaer adds the required delay after reset and fixes the device tree binding example. Dan Murphy's patches make the wake-gpio optional. In the last patch Xiaolong Huang fixes several kernel memory info leaks to the USB device in the kvaser_usb_leaf driver. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
| | * can: j1939: fix address claim code exampleMarc Kleine-Budde2019-12-081-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | During development the define J1939_PGN_ADDRESS_REQUEST was renamed to J1939_PGN_REQUEST. It was forgotten to adjust the documentation accordingly. This patch fixes the name of the symbol. Reported-by: https://github.com/linux-can/can-utils/issues/159#issuecomment-556538798 Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Cc: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
* | | nfp: add support for TLV device statsJakub Kicinski2019-12-111-0/+116
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Device stats are currently hard coded in the PCI BAR0 layout. Add a ability to read them from the TLV area instead. Names for the stats are maintained by the driver, and their meaning documented. This allows us to more easily add and remove device stats. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | | net-tcp: Disable TCP ssthresh metrics cache by defaultKevin(Yudong) Yang2019-12-101-0/+4
|/ / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch introduces a sysctl knob "net.ipv4.tcp_no_ssthresh_metrics_save" that disables TCP ssthresh metrics cache by default. Other parts of TCP metrics cache, e.g. rtt, cwnd, remain unchanged. As modern networks becoming more and more dynamic, TCP metrics cache today often causes more harm than benefits. For example, the same IP address is often shared by different subscribers behind NAT in residential networks. Even if the IP address is not shared by different users, caching the slow-start threshold of a previous short flow using loss-based congestion control (e.g. cubic) often causes the future longer flows of the same network path to exit slow-start prematurely with abysmal throughput. Caching ssthresh is very risky and can lead to terrible performance. Therefore it makes sense to make disabling ssthresh caching by default and opt-in for specific networks by the administrators. This practice also has worked well for several years of deployment with CUBIC congestion control at Google. Acked-by: Eric Dumazet <edumazet@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Acked-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Kevin(Yudong) Yang <yyd@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | Merge tag 'docs-5.5a' of git://git.lwn.net/linuxLinus Torvalds2019-12-023-3/+3
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull Documentation updates from Jonathan Corbet: "Here are the main documentation changes for 5.5: - Various kerneldoc script enhancements. - More RST conversions; those are slowing down as we run out of things to convert, but we're a ways from done still. - Dan's "maintainer profile entry" work landed at last. Now we just need to get maintainers to fill in the profiles... - A reworking of the parallel build setup to work better with a variety of systems (and to not take over huge systems entirely in particular). - The MAINTAINERS file is now converted to RST during the build. Hopefully nobody ever tries to print this thing, or they will need to load a lot of paper. - A script and documentation making it easy for maintainers to add Link: tags at commit time. Also included is the removal of a bunch of spurious CR characters" * tag 'docs-5.5a' of git://git.lwn.net/linux: (91 commits) docs: remove a bunch of stray CRs docs: fix up the maintainer profile document libnvdimm, MAINTAINERS: Maintainer Entry Profile Maintainer Handbook: Maintainer Entry Profile MAINTAINERS: Reclaim the P: tag for Maintainer Entry Profile docs, parallelism: Rearrange how jobserver reservations are made docs, parallelism: Do not leak blocking mode to other readers docs, parallelism: Fix failure path and add comment Documentation: Remove bootmem_debug from kernel-parameters.txt Documentation: security: core.rst: fix warnings Documentation/process/howto/kokr: Update for 4.x -> 5.x versioning Documentation/translation: Use Korean for Korean translation title docs/memory-barriers.txt: Remove remaining references to mmiowb() docs/memory-barriers.txt/kokr: Update I/O section to be clearer about CPU vs thread docs/memory-barriers.txt/kokr: Fix style, spacing and grammar in I/O section Documentation/kokr: Kill all references to mmiowb() docs/memory-barriers.txt/kokr: Rewrite "KERNEL I/O BARRIER EFFECTS" section docs: Add initial documentation for devfreq Documentation: Document how to get links with git am docs: Add request_irq() documentation ...
| * docs: remove a bunch of stray CRsJonathan Corbet2019-12-0112-56/+56
| | | | | | | | | | | | | | | | | | | | A pair of documentation patches introduced a bunch of unwanted carriage-return characters into the docs. Remove them, and chase away the ghost of DOS for another day. Fixes: a016e092940f ("docs: admin-guide: dell_rbu: Improve formatting and spelling") Fixes: bdd68860a044 ("Documentation: networking: device drivers: Remove stray asterisks") Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| * Merge tag 'v5.4-rc4' into docs-nextJonathan Corbet2019-10-294-20/+23
| |\ | | | | | | | | | | | | | | | I need to pick up the independent changes made to Documentation/core-api/memory-allocation.rst to be able to merge further work without creating a total mess.
| * | docs: networking: phy: Improve phrasingJonathan Neuschäfer2019-10-101-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | It's not about times (multiple occurences of an event) but about the duration of a time interval. Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| * | docs: networking: devlink-trap: Fix reference to other documentJonathan Neuschäfer2019-10-101-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This fixes the following Sphinx warning: Documentation/networking/devlink-trap.rst:175: WARNING: unknown document: /devlink-trap-netdevsim Fixes: 9e0874570488 ("Documentation: Add description of netdevsim traps") Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| * | docs: fix some broken referencesMauro Carvalho Chehab2019-10-101-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There are a number of documentation files that got moved or renamed. update their references. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Acked-by: Shannon Nelson <snelson@pensando.io> Acked-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Rob Herring <robh@kernel.org> Acked-by: Paul Walmsley <paul.walmsley@sifive.com> # RISC-V Acked-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| * | Documentation: networking: device drivers: Remove stray asterisksJonathan Neuschäfer2019-10-0312-56/+56
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | These asterisks were once references to a line that said: "* Other names and brands may be claimed as the property of others." But now, they serve no purpose; they can only irritate the reader. Fixes: f12a84a9f650 ("Documentation: fm10k: Add kernel documentation") Fixes: 1e06edcc2f22 ("Documentation: i40e: Prepare documentation for RST conversion") Fixes: 1fae869bcf3d ("Documentation: ice: Prepare documentation for RST conversion") Fixes: df69ba43217d ("ionic: Add basic framework for IONIC Network device driver") Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Acked-by: Shannon Nelson <snelson@pensando.io> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
* | | Merge tag 'compat-ioctl-5.5' of ↵Linus Torvalds2019-12-011-0/+2
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org:/pub/scm/linux/kernel/git/arnd/playground Pull removal of most of fs/compat_ioctl.c from Arnd Bergmann: "As part of the cleanup of some remaining y2038 issues, I came to fs/compat_ioctl.c, which still has a couple of commands that need support for time64_t. In completely unrelated work, I spent time on cleaning up parts of this file in the past, moving things out into drivers instead. After Al Viro reviewed an earlier version of this series and did a lot more of that cleanup, I decided to try to completely eliminate the rest of it and move it all into drivers. This series incorporates some of Al's work and many patches of my own, but in the end stops short of actually removing the last part, which is the scsi ioctl handlers. I have patches for those as well, but they need more testing or possibly a rewrite" * tag 'compat-ioctl-5.5' of git://git.kernel.org:/pub/scm/linux/kernel/git/arnd/playground: (42 commits) scsi: sd: enable compat ioctls for sed-opal pktcdvd: add compat_ioctl handler compat_ioctl: move SG_GET_REQUEST_TABLE handling compat_ioctl: ppp: move simple commands into ppp_generic.c compat_ioctl: handle PPPIOCGIDLE for 64-bit time_t compat_ioctl: move PPPIOCSCOMPRESS to ppp_generic compat_ioctl: unify copy-in of ppp filters tty: handle compat PPP ioctls compat_ioctl: move SIOCOUTQ out of compat_ioctl.c compat_ioctl: handle SIOCOUTQNSD af_unix: add compat_ioctl support compat_ioctl: reimplement SG_IO handling compat_ioctl: move WDIOC handling into wdt drivers fs: compat_ioctl: move FITRIM emulation into file systems gfs2: add compat_ioctl support compat_ioctl: remove unused convert_in_user macro compat_ioctl: remove last RAID handling code compat_ioctl: remove /dev/raw ioctl translation compat_ioctl: remove PCI ioctl translation compat_ioctl: remove joystick ioctl translation ...
| * | | compat_ioctl: handle PPPIOCGIDLE for 64-bit time_tArnd Bergmann2019-10-231-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The ppp_idle structure is defined in terms of __kernel_time_t, which is defined as 'long' on all architectures, and this usage is not affected by the y2038 problem since it transports a time interval rather than an absolute time. However, the ppp user space defines the same structure as time_t, which may be 64-bit wide on new libc versions even on 32-bit architectures. It's easy enough to just handle both possible structure layouts on all architectures, to deal with the possibility that a user space ppp implementation comes with its own ppp_idle structure definition, as well as to document the fact that the driver is y2038-safe. Doing this also avoids the need for a special compat mode translation, since 32-bit and 64-bit kernels now support the same interfaces. The old 32-bit structure is also available on native 64-bit architectures now, but this is harmless. Cc: netdev@vger.kernel.org Cc: linux-ppp@vger.kernel.org Cc: Paul Mackerras <paulus@samba.org> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
* | | | net: Fix a documentation bug wrt. ip_unprivileged_port_startMaciej Żenczykowski2019-11-261-4/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It cannot overlap with the local port range - ie. with autobind selectable ports - and not with reserved ports. Indeed 'ip_local_reserved_ports' isn't even a range, it's a (by default empty) set. Fixes: 4548b683b781 ("Introduce a sysctl that modifies the value of PROT_SOCK.") Signed-off-by: Maciej Żenczykowski <maze@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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