MFC r344855 (by jhb):

Drop "All rights reserved" from my copyright statements.

Reviewed by: rgrimes
Differential Revision: https://reviews.freebsd.org/D19485

MFC 357062: Correct the return types of fueword*().

MFC 355600: Add a callout_func_t typedef for functions used with callout_*().

This typedef is the same as timeout_t except that it is in the callout
namespace and header.

Use this typedef in various places of the callout implementation that
were either using the raw type or timeout_t.

While here, add <sys/callout.h> to the manpage.

MFC r349220: Add wakeup_any(), cheaper wakeup_one() for taskqueue(9).

wakeup_one() and underlying sleepq_signal() spend additional time trying
to be fair, waking thread with highest priority, sleeping longest time.
But in case of taskqueue there are many absolutely identical threads, and
any fairness between them is quite pointless. It makes even worse, since
round-robin wakeups not only make previous CPU affinity in scheduler quite
useless, but also hide from user chance to see CPU bottlenecks, when
sequential workload with one request at a time looks evenly distributed
between multiple threads.

This change adds new SLEEPQ_UNFAIR flag to sleepq_signal(), making it wakeup
thread that went to sleep last, but no longer in context switch (to avoid
immediate spinning on the thread lock). On top of that new wakeup_any()
function is added, equivalent to wakeup_one(), but setting the flag.
On top of that taskqueue(9) is switchied to wakeup_any() to wakeup its
threads.

As result, on 72-core Xeon v4 machine sequential ZFS write to 12 ZVOLs
with 16KB block size spend 34% less time in wakeup_any() and descendants
then it was spending in wakeup_one(), and total write throughput increased
by ~10% with the same as before CPU usage.

MFC 351224: Trim a spurious blank line I added in r348969.

I did not bump .Dd since there is no content change.

MFC 348970,348974:
Make the warning intervals for deprecated crypto algorithms tunable.

348970:
Make the warning intervals for deprecated crypto algorithms tunable.

New sysctl/tunables can now set the interval (in seconds) between
rate-limited crypto warnings. The new sysctls are:
- kern.cryptodev_warn_interval for /dev/crypto
- net.inet.ipsec.crypto_warn_interval for IPsec
- kern.kgssapi_warn_interval for KGSSAPI

348974:
Move declaration of warninterval out from under COMPAT_FREEBSD32.

This fixes builds of kernels without COMPAT_FREEBSD32.

MFC 348969: Document sysctl nodes that translate their values.

This documents the behavior of sysctl_msec_to_ticks.

The MFC does not document SYSCTL_{ADD,}_SBINTIME_[UM]SEC since those
are only present in head.

MFC r349237:

VOP_REVOKE(9): update locking requirements per r143495

Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D20524

MFC r349230, r349234, r349477

r349230:
Add a VOP_BMAP(9) man page

Reviewed by: mckusick
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D20704

r349234:
VOP_BMAP(9): fix typo in the copyright header

Reported by: rgrimes
MFC-With: 349230
Sponsored by: The FreeBSD Foundation

r349477:
[skip ci] VOP_BMAP.9: fix diction in copyright header

MFC-With: r349230
Sponsored by: The FreeBSD Foundation

MFC r349950:
Style: avoid long lines by using .Fo instead of .Fn.

MFC r348316:

VOP_ADVLOCK.9: fix description of flags

* F_RDLCK, F_UNLCK, and F_WRLCK aren't flags. They're stored in the
fl.l_type field.
* Add F_REMOTE, added in r177633
* Add F_NOINTR, added in r180025

Sponsored by: The FreeBSD Foundation

MFC r348113:

Update VFS_FHTOVP(9) with the flags argument

Revison 222167 added a new argument to VFS_FHTOVP. This revision updates the
man page to match.

Reviewed by: rmacklem
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D20323

MFC r345677:

Add man page for VOP_FDATASYNC(9)

Reviewed by: kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D19678

MFC r345202:

VOP_INACTIVE(9): clarify wording

Reviewed by: kib, 0mp
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D19596

MFC r345312: iflib: mark isc_driver_version as constant

(Additional comment by erj: This also adds a new sysctl_add_oid macro,
SYSCTL_ADD_CONST_STRING, for displaying const strings. This commit also
includes an edit to the sysctl.9 man page for it.)

Sponsored by: Intel Corporation

MFC r330358, r330360

r330358: Minor changes to wording.
r330360: Minor (mostly) wording changes.

MFC r344990:
Fix ieee80211_radiotap(9) usage in wireless drivers:

- Alignment issues:
* Add missing __packed attributes + padding across all drivers; in
most places there was an assumption that padding will be always
minimally suitable; in few places - e.g., in urtw(4) / rtwn(4) -
padding was just missing.
* Add __aligned(8) attribute for all Rx radiotap headers since they can
contain 64-bit TSF timestamp; it cannot appear in Tx radiotap headers, so
just drop the attribute here. Refresh ieee80211_radiotap(9) man page
accordingly.

- Since net80211 automatically updates channel frequency / flags in
ieee80211_radiotap_chan_change() drop duplicate setup for these fields
in drivers.

MFC r306049:
net80211: remove IEEE80211_RADIOTAP_TSFT field from transmit definitions.

This field may be used for received frames only.

MFC 318388: Add sglist_append_sglist().

This function permits a range of one scatter/gather list to be appended to
another sglist. This can be used to construct a scatter/gather list that
reorders or duplicates ranges from one or more existing scatter/gather
lists.

Sponsored by: Chelsio Communications

MFC lualoader: r326353, r328440, r328443, r329166-r329167, r329274, r329329,
r329349-r329352, r329355-r329359, r329366-r329369, r329386-r329387, r329393,
r329413-r329415, r329417, r329424-r329436, r329457, r329473-r329474,
r329496-r329501, r329503-r329504, r329543, r329547-r329551, r329576-r329578,
r329580, r329583, r329585-r329590, r329592-r329596, r329609-r329611,
r329614, r329619, r329621-r329622, r329624, r329626-r329627,
r329629-r329632, r329640-r329641, r329643-r329646, r329649-r329650, r329654,
r329656, r329662, r329669-r329671, r329673-r329674, r329680,
r329684-r329689, r329692-r329693, r329696-r329700, r329709, r329716,
r329731, r329733-r329734, r329747-r329748, r329756, r329779, r329782,
r329784, r329786, r329804, r329806, r329809, r329811, r329836,
r329850-r329852, r329854, r329856-r329858, r329861, r329895,
r329897-r329899, r329901-r329903, r329922-r329924, r329927-r329928,
r329944-r329949, r329986-r329987, r330008-r330010, r330012, r330020,
r330082-r330084, r330087-r330088, r330098-r330101, r330138-r330139,
r330261-r330263, r330267-r330269, r330281-r330284, r330287, r330339-r330342,
r330345-r330346, r330369-r330370, r330434-r330435, r330564, r330616-r330618,
r330620, r330625, r330690, r330701, r330703, r330825, r331211, r331257,
r331259, r331281-r331282, r331304, r331314, r331476-r331477,
r331563-r331564, r331854-r331857, r331859-r331860, r332106, r334723,
r334879, r334891, r334907, r334912, r334939, r334986, r335009, r335371,
r336759, r337711, r337807-r337810, r338054, r338063, r338065-r338067,
r338083, r338085-r338086, r338108, r338167-r338168, r338173, r338203,
r338255, r338259, r338309, r338394, r338438, r338886, r338893, r339173,
r339200, r339218, r339222, r339301, r339307, r339677-r339678, r339702,
r339805, r339831, r339849, r340040, r340152

Some notes for this MFC:
- This is still pre-forth/lua coexistance; that will come shortly-ish so
that forth/lua may be installed together (with forth remaining the default)

- module_blacklist support for lualoader has been MFC'd, but the drm modules
are not blacklisted in this stable branch.

r326353: Import lua 5.3.4 to contrib
r328440: Preserve the original luaconf.h in a convenient place. Clients will
r328443: Gross hack to omit printing hex floating point when the lua number
r329166: Add Lua as a scripting langauge to /boot/loader
r329167: Add the lua scripts from the lua-bootloader SoC
r329274: stand/lua: Exit sub-menus on backspace
r329329: stand/lua: Always boot on 'enter' keypress in menus
r329349: stand/lua: Reduce magic numbers
r329350: stand/lua: Don't descend into an empty kernels submenu
r329351: stand/lua: Set reasonable ACPI default based on presence
r329352: stand/lua: Consistently use semicolons for line endings
r329355: stand/lua: Move kernel selection into main menu
r329356: stand/lua: Allow menu items to not have explicit aliases
r329357: stand/lua: Remove explicit alias from "Back to main menu"
r329358: stand/lua: Say "loader prompt" instead of "lua interpreter"
r329359: stand/lua: Remove a magic number/string (not a trivial literal)
r329366: stand/lua: Set ACPI's default the proper way (setACPI)
r329367: stand/lua: Create a "carousel" menu entry type
r329368: stand/lua: Create/use some MENU_ constants where applicable
r329369: stand/lua: Remove sneaky kernel assignment
r329386: stand/lua: Correct usage and acceptance of BACKSPACE/DELETE keys
r329387: stand/lua: Chop off the decimal for numbers passed to setcursor
r329393: stand/lua: Use escaped dot instead of single character class
r329413: stand/lua: Allow MENU_RETURN items to have func, fix esc. to prompt
r329414: stand/lua: Don't try to divide by 0; do nothing
r329415: stand/lua: Don't reload kernel config if we only have one kernel
r329417: stand/lua: Make CAROUSEL_ENTRY func parameters consistent with name
r329424: stand/lua: Don't set autoboot_delay=NO in menu autoboot sequence
r329425: stand/lua: Enable menu autoboot; it seems to work
r329426: stand/lua: Correct interpretation of autoboot_delay
r329427: stand/lua: Color non-default kernels blue
r329428: stand/lua: Correct some trivial errors in config
r329429: stand/lua: Add debug method to dump modules
r329430: stand/lua: Address some nits
r329431: stand/lua: Correct test sense, this should have been 'not nil'
r329432: stand/lua: Try to load alternate kernels as directories first
r329433: stand/lua: Add optional GELI passphrase prompt
r329434: stand/lua: Check for nil (GELI prompt)
r329435: stand/lua: Style pass
r329436: stand/lua: Debugging string snuck in...
r329457: stand/lua: dumpModules => lsModules
r329473: liblua: Clean up io/loader C module registration
r329474: liblua: Emulate DIR, opendir, fdopendir, closedir
r329496: stand/lua: Fix verbiage and some typos
r329497: stand/lua: Fix module_path handling with multiple kernels
r329498: stand/lua: Remove some debugging bits that snuck in... gr...
r329499: interp_lua: Register io/loader with regular Lua module system
r329500: Lua loader: Add barebones "lfs" module
r329501: lua loader: Auto detect eligible list of kernels to boot
r329503: liblua: Fix missing '}' in lutil.c after r329499
r329504: stand/lua: More style nits, config.lua
r329543: Create style.lua(9)
r329547: stand/lua: Allow menu items to be conditionally (in)visible
r329548: stand/lua: Addres style.lua(9) concern
r329549: stand/lua: Clear the screen before prompting for passwords
r329550: stand/lua: Store the loaded kernel as config.kernel_loaded
r329551: stand/lua: reload previously loaded kernel at config-load/reload
r329576: stand/lua: Defer kernel/module loading until boot or menu escape
r329577: stand/lua: Rename bootserial for clarity
r329578: stand/lua: Menu style.lua(9) nits
r329580: stand/lua: Remove some unused local declarations
r329583: stand/lua: Store menu entries in an "entries" table
r329585: stand/lua: Add core.isSingleUserBoot
r329586: stand/lua: Call menu_entries if it's a function
r329587: stand/lua: Swap single-/multi- user boot entries as needed
r329588: stand/lua: Re-wrap menu.lua now that I've added indentation...
r329589: stand/lua: Track env changes that come in via loader.conf(5)
r329590: stand/lua: Restore environment upon config reload
r329592: stand/lua: Remove inaccurate comment after r329590
r329593: stand/lua: Change boot menu items' names when swapped
r329594: stand/lua: Round up some more style.lua(9) concerns
r329595: stand/lua: Re-order locals after copyright notice; require first
r329596: stand/lua: Add copyright notice in places
r329609: stand/lua: Cache swapped menu, and don't create locals for swapping
r329610: style.lua(9): Note that wrapping at 80-columns is not rigid
r329611: stand/lua: Wrap tuple assignment earlier for readability
r329614: stand/lua: Don't set ACPI off just because we can't detect it.
r329619: stand/lua: Extract menu handlers out into menu.handlers table
r329621: stand/lua: Add and use drawer.menu_name_handlers
r329622: stand/lua: Move drawer.menu_name_handlers further up
r329624: stand/lua: Reduce exposure of the drawer module
r329626: stand/lua: Refactor logos into drawer.logodefs table
r329627: stand/lua: Refactor brands into drawer.branddefs
r329629: stand/lua: Use 'graphic' instead of 'logo' for depicting graphics
r329630: stand/lua: Stick a copyright notice on drawer.lua
r329631: stand/lua: Insert helpful comment for drawer.branddefs
r329632: style.lua(9): Clarify local variable guideline
r329640: stand/lua: Consistently declare local functions at module scope
r329641: stand/lua: Consistently organize modules
r329643: Implement loader.command
r329644: lualoader: Add ability to intercept cli commands
r329645: lualoader: Move carousel storage out into config
r329646: lualoader: Eliminate global namespace pollution in loader.lua
r329649: Lua lfs.attributes: Provide a more consistent error return
r329650: liblua: Add loader.machine and loader.machine_arch properties
r329654: lualoader: Ignore ACPI bits on !i386
r329656: loader.lua: Expose errno table to lua
r329662: lualoader: Replace invalid construct with valid construct
r329669: lualoader: Prefer selected kernel to currently loaded
r329670: lualoader: Don't try so hard to load a kernel
r329671: lualoader: Prepare for interception of "boot" CLI cmd
r329673: lualoader: Intercept boot cli command
r329674: lualoader: Intercept the 'autoboot' cli command
r329680: lualoader: When restoring environment, only restore unchanged vars
r329684: lualoader: Drop terminating semicolons
r329685: lualoader: Drop excessive parenthesizing
r329686: style.lua(9): Drop notes about semicolons
r329687: lualoader: Drop explicit boolean tests; b or not b
r329688: lualoader: Don't return false for failure to open config on silent
r329689: lualoader: Output "Failed to parse" messages
r329692: lualoader: Bring in local.lua module if it exists
r329693: lualoader: Return only argstr if with_kernel not requested
r329696: lualoader: Add "menu.default", initialized to menu.welcome
r329697: lualoader: Drop name requirement for menu separators
r329698: lualoader: Directly reference submenu definition with submenu key
r329699: lualoader: Simplify menu definitions a little further
r329700: lualoader: Allow carousel 'items' to be a table as well
r329709: lualoader: Don't autodetect kernels if 'kernels' is explicitly set
r329716: lualoader: Use the key that interrupts autoboot as a menu choice
r329731: lualoader: Add boot environment support
r329733: lualoader: Make kernel autodetect. contingent on loader.conf(5) var
r329734: lualoader: Don't execute menu.autoboot() for every opened menu
r329747: lualoader: Replace 8-space indentation with a single tab
r329748: lualoader: Drop password length restrictions
r329756: lualoader: Remove nasty hack for not printing out ".0"
r329779: lualoader: Split cli bits out into a cli module
r329782: lualoader: Unbreak 'boot [kernel]' by including config
r329784: lualoader: Pull argument extraction for cli funcs to cli.arguments
r329786: lualoader: Attach cli command functions to cli module
r329804: lualoader: Eliminate some unused locals
r329806: lualoader: Consistently use double quotes
r329809: lualoader: Address some 'luacheck' concerns
r329811: lualoader: Clear up an empty conditional branch
r329836: lualoader: Attend to some 80-col issues, pointed out by luacheck
r329850: lualoader: Drop unused return values; we'll only use the first
r329851: Add SPDX tags to lua files
r329852: Add copyright notice to core.lua
r329854: lualoader: shallowCopyTable => deepCopyTable
r329856: lualoader: Use "local function x()" instead "local x = function()"
r329857: Centralize lua defines
r329858: When the LUA_FLOAT_TYPE != LUA_FLOAT_INT64, we can't ref. float
r329861: lualoader: Track effective line number, use it for drawing
r329895: liblua: Implement write support
r329897: lualoader: Add nextboot support
r329898: lualoader: Plug file handle not properly closed
r329899: lualoader: Correct test and name
r329901: lualoader: Add comment on trailing space, don't operate on nil
r329902: lualoader: Remove unused variable; we now use effective line number
r329903: lualoader: Explain nextboot stuff a little bit more
r329922: lualoader: Split config file I/O out into a separate function
r329923: lualoader: Strip config.parse of its I/O privileges
r329924: lualoader: throw out nextboot's usage of standard config processing
r329927: lualoader: Clean up naming conventions a little bit
r329928: lualoader: Remove inaccurate part of comment
r329944: lualoader: Don't explicitly index tables without reason
r329945: lualoader: menu: Terminate final values in tables with a comma
r329946: lualoader: Clean up menu handling a little bit
r329947: lualoader: Pull menu redrawing specifics out of menu.process
r329948: lualoader: Pull autoboot handling out into menu.run()
r329949: lualoader: Explain deviation from naming guidelines
r329986: lualoader: Invalidate the screen from menu perspective mnu exit
r329987: lualoader: Track the menu currently drawn, instead of validity
r330008: lualoader: A little more general menu cleanup
r330009: lualoader: More argument name expansion, part 2
r330010: lualoader: screen argument fixes
r330012: style.lua(9): Add some additional notes about naming and commas
r330020: lualoader: Re-work menu skipping bits
r330082: lualoader: Add a twiddle at password prompt
r330083: lualoader: Remove remnants of testing...
r330084: lualoader: Replace instances of \027 with KEYSTR_ESCAPE
r330087: lualoader: Convert instances of KEYSTR_ESCAPE .. "[" -> KEYSTR_CSI
r330088: lualoader: Correct test sense, comments, and add some more comments
r330098: lualoader: Re-do twiddle
r330099: lualoader: Further screen cleanup
r330100: lualoader: Remove debug function
r330101: lualoader: Add note that \027 is a decimal representation
r330138: lualoader: Dedup these "Return to main menu" entries
r330139: lualoader: config: Pull some messages out into constants
r330261: lualoader: Fix some lint-mentioned errors
r330262: lualoader: Use #str instead of tracking length with 'n'
r330263: lualoader: Use string literal \xNN instead of string.char()
r330267: Add core.lua(8), but do not add to distribution
r330268: Add menu.lua(8), but do not add to distribution
r330269: core.lua(8): Add missing note about core.KEYSTR_CSI
r330281: lualoader: Steamroll the box-drawing
r330282: lualoader: Register loader.printc as global printc
r330283: lualoader: Use global printc instead of loader.printc
r330284: liblua: Use putc instead of printf for printc
r330287: lualoader: Reset the cursor position after the menu is drawn
r330339: liblua: Add loader.interpret
r330340: lualoader: Execute menu_timeout_command at the end of menu autoboot
r330341: lualoader: Respect loader_menu_title, prepare for align
r330342: lualoader: Respect loader_menu_title_align
r330345: lualoader: Tweak positioning and fix an off-by-one
r330346: lualoader: Shift menu+brand even for logo=none with customized pos
r330369: lualoader: Return meaningful value in cli_execute
r330370: lualoader: logdef -> logodef typo
r330434: lualoader: Add note about importance of including cli module early
r330435: lualoader: Use FILESDIR instead of BINDIR
r330564: lualoader: Only loadelf before boot/autoboot if no kernel loaded
r330616: lualoader: Expose loader.parse and add cli_execute_unparsed
r330617: lualoader: Fix name, cli.execute_unparsed -> cli_execute_unparsed
r330618: lualoader: Use cli_execute_unparsed instead of loader.interpret
r330620: lualoader: Use cli_execute_unparsed for commands via loader.conf
r330625: lualoader: Return status in cli_execute_unparsed properly
r330690: stand: Fix copy-paste-o, unbreaks libi386 lualoader build
r330701: lualoader: Don't redraw the autoboot message every .05s
r330703: lualoader: Cache kernel list
r330825: lualoader: Sprinkle some verbose_loading salt
r331211: lualoader: Setup default color scheme if we're using colors
r331257: lualoader: Reset attributes and color scheme with color.highlight()
r331259: lualoader: Use less atomic options for resetting colors/attributes
r331281: lualoader: Add primitive hook module to untangle bogus reference
r331282: core.lua(8): Update to reflect recently added function
r331304: lualoader: Clear up some possible naming confusion
r331314: lualoader: Use printc when we expect ANSI escape sequences
r331476: lualoader: Make config env-related bits private API
r331477: lualoader: Privatize some more config.lua bits
r331563: lualoader: Implement try_include and use it for including local
r331564: lualoader: Actually re-raise error in try_include
r331854: lualoader: Do case-insensitive comparison of "yes"
r331855: lualoader: Don't assume that {module}_load is set
r331856: lualoader: revert whitespace change that snuck in
r331857: lualoader: Simplify some expressions
r331859: lualoader: Split logodefs out into logo-* files
r331860: lualoader: Don't try to lookup a nil logo
r332106: lualoader: Fix menu skipping with loader.conf(5) vars
r334723: lualoader: Add a loaded hook for others to execute upon config load
r334879: lualoader: Add hook.lua(8) to tree
r334891: lualoader: Add cli.lua(8) to the tree
r334907: lualoader: Process loader_conf_files properly
r334912: lualoader: Support variable substitution in env var settings
r334939: lualoader: Allow brand-*.lua for adding new brands
r334986: lualoader: More black-on-white fixes
r335009: lualoader: Match Forth module-loading behavior w.r.t flags
r335371: lualoader: Correct kernel_options handling
r336759: lualoader: "nextboot_file" should be spelled "nextboot_conf"
r337711: lualoader: Fix parsing of negative number loader.conf(5) variables
r337807: Prevent a wanring about checkdp being unused.
r337808: When the LUA floating point model is INT64, we don't need to do the
r337809: For our INT64 implementation, we can compare integers and numbers
r337810: MFV r337586: lua: Update to 5.3.5
r338054: Add config.lua(8) to the tree
r338063: lualoader: Stop exporting drawer.draw
r338065: lualoader: Hide most of the internal drawing functions
r338066: lualoader: Hide the rest of the private interfaces
r338067: lualoader: Add drawer-exported variables for default logodefs
r338083: Add drawer.lua(8)
r338085: Add color.lua(8), password.lua(8), and screen.lua(8)
r338086: lualoader: Install all manpages
r338108: Serial console menus for lua.
r338167: lualoader: Just compare expression directly
r338168: lualoader: Refactor config line expressions
r338173: lualoader: Fix loader.conf(5) EOL validation for 'exec' lines
r338203: Turn off LOADER_GELI and LOADER_LUA for sparc64, until functional
r338255: lualoader: Fix (add) Xen support
r338259: lualoader: Accept that people use unquoted values in loader.conf
r338309: lualoader: Fix override of module_path on loader prompt
r338394: lualoader: fix color usage
r338438: lualoader: Handle comma-separated kernels as well
r338886: Improve loader passwords:
r338893: Set the default loader for powerpc(32- and 64-bit) back to to forth
r339173: Set the default loader for powerpc64 back to to forth too.
r339200: lualoader: Don't draw loader menu with autoboot_delay=-1
r339218: lualoader: Create a module blacklist, add DRM modules to it
r339222: lualoader: Honor boot_* variables at lua init
r339301: Loader GELI support, like lua loader, seems to be broken on PowerPC
r339307: lualoader: Provide a 'menu' command to redraw the menu at prompt
r339677: lualoader: unload upon kernel change if a kernel was loaded
r339678: menu.lua: Abort autoboot sequence on failed command
r339702: lualoader: Improve module loading diagnostics
r339805: lualoader: Always return a proper dictionary for blacklist
r339831: Move LUA_ROOT to /boot/lua
r339849: lualoader: Fix try_include error handling
r340040: lualoader: Implement boot-conf
r340152: lualoader: Add chainload menu entry

Relnotes: yes ("lualoader has been merged to stable/11, off by
default, to facilitate testing")

MFC r343366:

Remove documentation for the nonexistant cred_update_thread(9).

This was a tangential change submitted as part of D18930.

Submitted by: jack@gandi.net

MFC r342144:
Document new required MI behaviour of pmap_enter(9) for CoW.

MFC r340475

ifnet(9): Add description of IFCAP_NETMAP

Describe IFCAP_NETMAP adding a cross reference to netmap(4).

Reviewed by: bcr, 0mp
Approved by: gnn (mentor)
Differential Revision: https://reviews.freebsd.org/D17988

MFC r340730, r340731:
Add taskqueue_quiesce(9) and use it to implement taskq_wait().

PR: 227784

MFC r337482:

Bring VOP_LOOKUP(9) up to date

* Remove the cn_hash field (removed by r51906)
* Add the cn_lkflags field (added by r144285)
* Remove duplicate definition of cnp.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D16629

MFC 337673: Add an overview section to bus_dma.9.

Describe the role of tags and mapping objects as abstractions.
Describe static vs dynamic transaction types and give a brief overview
of the set of functions and object life cycles used for static vs
dynamic.

While here, fix a few other typos and expand a bit on parent tags.

MFC r337236:
Some updates to vm_map(9).

MFC r304910, r304912, r304915, r304952, r325019, r328164, r331094, r332664,
r335341-r335345, r335347, r335379-r335380, r335382

r304910:
Introduce cnv man page.

r304912:
Add missed header file for cnv.h .

r304915:
Bump date in the man page.

r304952:
Remove duplicated declaration.

r325019:
Introduce cnvlist_name() and cnvlist_type() functions.

Those function can be used when we are iterating over nvlist to reduce
amount of extra variables we need to declare.

r328164:
libnv: Use mallocarray(9) for the nv_calloc.

r331094:
Fix formatting errors that resulted in apropos(1) output looking weird.

r332664:
Add missing argument in the cnv man page.

r335341:
libnv: change name of cookie from cookiep to cookie.

The name was inconsistent with rest of the library.
No functional change intended.

r335342:
libnv: add const to cookies arguments

r335343:
libnv: Remove nvlist argument from cnvlist_{take,free}_* functions.

All information which are need for those operations is already stored in
the cookie.

We decided not to bump libnv version because this API is not used yet in the
base system.

r335344:
libnv: clean parent in nvlist_array when removing it.

When we are removing element form the nvlist we should also clean parent,
because the array is not a part of the nvlist anymore.

r335345:
libnv: add regression test for r335344.

r335347:
libnv: Add nvlist_append_*_array() family of functions.

The nvlist_append_{bool,number,string,nvlist,descriptor}_array() functions
allows to dynamically extend array stored in the nvlist.

r335379:
Set prev to NULL so its garaunteed to have a value of some kind and
gcc doesn't explode. Feel free to fix this correctly or whatever for
gcc builds.

This *should* quiesce tinderbox after r335347 for the gcc builds.

r335380:
style(9) fix, I was also going to silence gcc.

r335382:
Really fix the style.

MFC r335660:
Add missing MLINK.

MFC r334100:
Document the return value of sbuf_bcat(9).

MFC r332317, r332439, r332442

Approved by: re

r332317:
[man] Fix return type of BUS_ADD_CHILD(9)

Fix return type of BUS_ADD_CHILD(9) in SYNOPSYS section,
it should be device_t, not int

PR: 207389

r332439:
Fix quotes in the example code in syslog(3) BUGS section

mdoc treats verbatim quotes in .Dl as a string delimiter and does
not pass them to the rendered output. Use special char \*q to specify
double quote

PR: 216755

r332442:
Bump .Dd value (forgot to do this in r332439)

MFC r332043:
Typo.

MFC r330627:

g_bio(9): fix a documentation oversight from r163870

MFC r325403:

Add missing MLINKS for disk_add_alias(9).

MFC r331436:

netpfil: Introduce PFIL_FWD flag

Forwarded packets passed through PFIL_OUT, which made it difficult for
firewalls to figure out if they were forwarding or producing packets. This in
turn is an issue for pf for IPv6 fragment handling: it needs to call
ip6_output() or ip6_forward() to handle the fragments. Figuring out which was
difficult (and until now, incorrect).
Having pfil distinguish the two removes an ugly piece of code from pf.

Introduce a new variant of the netpfil callbacks with a flags variable, which
has PFIL_FWD set for forwarded packets. This allows pf to reliably work out if
a packet is forwarded.

MFC r330309:

[fdt_pinctrl] Add man pages for fdt_pinctrl driver

- Add fdt_pinctrl(4) with general information for the driver
- Add fdt_pinctrl(9) with fdt_pinctrl KPI description

Reviewed by: ian, manu, wblock
Differential Revision: https://reviews.freebsd.org/D14235

MFC r325621, r325622, r331227

Add EVENTHANDLER_LIST and some users.

Also fix a longstanding bug in mtx initialization.

MFC r331274

Extend the description of ALTQ to call it a system which is a framework in
altq(4) to match altq(9). This makes preserving the history section as the
author of ALTQ easier in the history section, rather than calling it a framework
in the description & a system in the history.
Add a history section to altq(4) and extend the history section in altq(9)

MFC r329598:

Add PCI methods to iterate over the PCI capabilities

VirtIO V1 provides configuration in multiple VENDOR capabilities so this
allows all of the configuration to be discovered.

Reviewed by: jhb
Differential Revision: https://reviews.freebsd.org/D14325

MFC r330349 and r330362:
Allow pause_sbt() to catch signals during sleep by passing C_CATCH flag.
Define pause_sig() function macro helper similarly to other kernel functions
which catch signals. Update outdated function description.

Document pause_sig(9) and update prototypes for existing pause(9) and
pause_sbt(9) functions.

Discussed with: kib@
Suggested by: cem@
Sponsored by: Mellanox Technologies

MFC r329347:
Note that on amd64 pmap_enter(psind = 1) works.

MFC r315718, r316031:
Add support for 8- and 16-bit atomic_(f)cmpset to x86.

MFC 328917:

Correct structure name used in bus_map_resource(9) example

MFC r327674, r327796

Introduce mallocarray() in the kernel

Similar to calloc() the mallocarray() function checks for integer
overflows before allocating memory.
It does not zero memory, unless the M_ZERO flag is set.

Additionally, move the overflow check logic out to WOULD_OVERFLOW() for
consumers to have a common means of testing for overflowing allocations.
WOULD_OVERFLOW() should be a secondary check -- on 64-bit platforms, just
because an allocation won't overflow size_t does not mean it is a sane size
to request. Callers should be imposing reasonable allocation limits far,
far, below overflow.

Obtained from: OpenBSD

MFC r324413, r324415

r324413:
Restore the ability to deregister an eventhandler from within the callback.

When the EVENTHANDLER(9) subsystem was created, it was a documented feature
that an eventhandler callback function could safely deregister itself. In
r200652 that feature was inadvertantly broken by adding drain-wait logic to
eventhandler_deregister(), so that it would be safe to unload a module upon
return from deregistering its event handlers.

There are now 145 callers of EVENTHANDLER_DEREGISTER(), and it's likely many
of them are depending on the drain-wait logic that has been in place for 8
years. So instead of creating a separate eventhandler_drain() and adding it
to some or all of those 145 call sites, this creates a separate
eventhandler_drain_nowait() function for the specific purpose of
deregistering a callback from within the running callback.

Differential Revision: https://reviews.freebsd.org/D12561

r324415:
Add eventhandler notifications for newbus device attach/detach.

The detach case is slightly complicated by the fact that some in-kernel
consumers may want to know before a device detaches (so they can release
related resources, stop using the device, etc), but the detach can fail. So
there are pre- and post-detach notifications for those consumers who need to
handle all cases.

A couple salient comments from the review, they amount to some helpful
documentation about these events, but there's currently no good place for
such documentation...

Note that in the current newbus locking model, DETACH_BEGIN and
DETACH_COMPLETE/FAILED sequence of event handler invocation might interweave
with other attach/detach events arbitrarily. The handlers should be prepared
for such situations.

Also should note that detach may be called after the parent bus knows the
hardware has left the building. In-kernel consumers have to be prepared to
cope with this race.

Differential Revision: https://reviews.freebsd.org/D12557

MFC r327088:
Update HISTORY section for the atomic(9) page.

MFC r326982
Document the semantics of atomic_thread_fence operations.

Add atomic_load_<type> and atomic_store_<type>, and explain why they
exist.

Define the synchronizes-with relationship and its effects.

Reorder and revise some of the existing text. For example, more
precisely describe when ordinary accesses are atomic.

MFC r325946:

VOP_LOOKUP.9: update locking info

The old description has been inaccurate since at least 243271, if not
before.

Submitted by: will
Reviewed by: kib
Sponsored by: Spectra Logic Corp
Differential Revision: https://reviews.freebsd.org/D13108

MFC r326060:
Clean up the SYSINIT_FLAGS definitions for rwlock(9) and rmlock(9).

MFC r324926:
Expand explanation of atomicity.

MFC r324509: sysctl.9: document CTLFLAG_CAPRD and CTLFLAG_CAPWR

Reported by: Shawn Webb
Sponsored by: The FreeBSD Foundation

MFC r323655:

Add missing links to the nv man page.

MFC r323654:

Fix names of the array functions in the nv man page.

Submitted by: def@

MFC r322465:

Add config_intrhook_oneshot(): schedule an intrhook function and unregister
it automatically after it runs.

The config_intrhook mechanism allows a driver to stall the boot process
until device(s) required for booting are available, by not allowing system
inits to proceed until all intrhook functions have been unregistered.
Virtually all existing code simply unregisters from within the hook function
when it gets called.

This new function makes that common usage more convenient. Instead of
allocating and filling in a struct, passing it to a function that might (in
theory) fail, and checking the return code, now a driver can simply call
this cannot-fail routine, passing just the intrhook function and its arg.

Differential Revision: https://reviews.freebsd.org/D11963

MFC r320901-r320902, r320996-r320997, r321002, r321048, r321400, r321743,
r321745

r320901:
Protect access to the AT realtime clock with its own mutex.

The mutex protecting access to the registered realtime clock should not be
overloaded to protect access to the atrtc hardware, which might not even be
the registered rtc. More importantly, the resettodr mutex needs to be
eliminated to remove locking/sleeping restrictions on clock drivers, and
that can't happen if MD code for amd64 depends on it. This change moves the
protection into what's really being protected: access to the atrtc date and
time registers.

This change also adds protection when the clock is accessed from
xentimer_settime(), which bypasses the resettodr locking.

Differential Revision: https://reviews.freebsd.org/D11483

r320902:
Support multiple realtime clocks, and remove locking/sleeping restrictions
on clock drivers.

This tracks multiple concurrent realtime clock drivers in a list sorted by
clock resolution. When system time changes (and periodically) the
clock_settime() methods of all registered clocks are invoked.

To initialize system time, each driver is tried in turn from best to worst
resolution, until one succesfully returns a valid time.

The code no longer holds a mutex while calling the clock_settime() and
clock_gettime() methods of the registered clocks. This allows clock drivers
to do whatever kind of locking or sleeping is necessary (this is especially
important for i2c clock chips since i2c drivers often need to sleep).

A new clock_register_flags() function allows the clock driver to pass
flags. The flags currently defined help support drivers that use their own
techniques to avoid roundoff errors (prevents the 4/5 rounding done by the
subr_rtc code). A driver which may need to wait for resources (such as bus
ownership) may pass a flag to indicate that it will obtain system time for
itself after waiting for resources; this is merely an optimization to avoid
the common code retrieving a timespec that will never get used.

Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D11484

r320996:
Allow setting debug.clocktime as a tunable. Print 64-bit time_t correctly
on 32-bit systems.

r320997:
Minor optimization: instead of converting between days and years using
loops that start in 1970, assume most conversions are going to be for recent
dates and use a precomputed number of days through the end of 2016.

r321002:
Revert r320997. There are reports of it getting the wrong results, so
clearly my testing was insuffficent, and it's best to just revert it
until I get it straightened out.

r321048:
Minor optimization: instead of converting between days and years using loops
that start in 1970, assume most conversions are going to be for recent dates
and use a precomputed number of days through the end of 2016.

This is a do-over of r320997, hopefully this time with 100% more workiness.

The first attempt had an off-by-one error, but instead of just adding
another mysterious +1 adjustment, this rearranges the relationship between
recent_base_year and recent_base_days so that the latter is the number of
days that occurred before the start of the associated year (instead of the
count thru the end of that year). This makes the recent_base stuff work
more like the original loop logic that didn't need any +1 adjustments.

r321400:
Add common code to support realtime clocks that store year without century.

Most realtime clocks store the year as 2 BCD digits. Some add a century bit
to extend the range another hundred years. Every clock driver has its own
code to determine the century and pass a full year value to clock_ct_to_ts().
Now clock drivers can just convert BCD to bin and store the result in the
clocktime struct and let the common code figure out the century. Clocks
with a century bit can just add 100 to year if the century bit is on.

r321743:
Add taskqueue_enqueue_timeout_sbt(), because sometimes you want more control
over the scheduling precision than 'ticks' can offer, and because sometimes
you're already working with sbintime_t units and it's dumb to convert them
to ticks just so they can get converted back to sbintime_t under the hood.

r321745:
Add clock_schedule(), a feature that allows realtime clock drivers to
request that their clock_settime() methods be called at a given offset
from top-of-second. This adds a timeout_task to the rtc_instance so that
each clock can be separately added to taskqueue_thread with the scheduling
it prefers, instead of looping through all the clocks at once with a
single task on taskqueue_thread. If a driver doesn't call clock_schedule()
the default is the old behavior: clock_settime() is queued immediately.

MFC r315089: Document uiomove_frombuf(9).

MFC note: content changes based on r309745 not included.

MFC r315799:

counter(9): fix igor/manlint warnings

- Reword description of `counter_enter` slightly to fix
wordiness [1].
- Expand "isn't" as "is not" [1].
- Add missing section number with .Xr sysctl calls [2].

MFC note: cnv(9) diff ignored since API/manpage not present on
^/stable/11.

MFC r309066:

r309066 (by brueffer):

Fix various mdoc issues reported by mandoc -Tlint.

MFC r316549,r316550,r316551,r316554:

r316549:

Add sys/types.h #include to EXAMPLE to provide a complete functional
standalone example program

r316550:

sbuf(9): convert SYNOPSIS section from .Fn entries to .Fo/.Fa/.Fc entries

This shortens the column count on many lines considerably.

While here, add "(void)" to sbuf_new_auto(3) for consistency with style(9)
recommendations.

r316551:

sbuf(9): clarify kernel-only APIs

- move sbuf_bcopyin(9) and sbuf_copyin(9) near sbuf_new_for_sysctl(9), as
all three functions are kernel-only APIs.
- add #ifdef _KERNEL around sbuf_*copyin and sbuf_new_for_sysctl(9) to
make it visually clear that they are kernel-only APIs.

r316554:

sbuf(9): add MLINKS for sbuf_{clear,get,set}_flags(9)

These functions were added in r279992.

MFC r307873,r314397,r314399,r314419,r314420,r314533,r316553:

r307873 (by marcel):

Include <stdarg.h> instead of <machine/stdarg.h> when compiled as
part of libsbuf. The former is the standard header, and allows us
to compile libsbuf on macOS/linux.

r314397 (by scottl):

Implement sbuf_prf(), which takes an sbuf and outputs it
to stdout in the non-kernel case and to the console+log
in the kernel case. For the kernel case it hooks the
putbuf() machinery underneath printf(9) so that the buffer
is written completely atomically and without a copy into
another temporary buffer. This is useful for fixing
compound console/log messages that become broken and
interleaved when multiple threads are competing for the
console.

r314399 (by scottl):

Add prototype for sbuf_putbuf()

r314419 (by jkim):

Include stdio.h to fix libsbuf build.

r314420 (by scottl):

Provide a comment on why stdio.h needs to be included.

r314533 (by scottl):

Expose the sbuf_putbuf() symbol to libsbuf. There are a few other symbols
that are present but not exposed, like get/set/clear flags, not sure if they
need to be exposed at this point.

r316553:

sbuf(3): expose sbuf_{clear,get,set}_flags(3) via libsbuf

These functions were added to sbuf(9) in r279992, but never
exposed to userspace. Expose them now so they can be used/tested.

MFC r320755,r320762,r320893:
BIT_FLS(9).

MFC r318781:
Add BIT_OR2(), BIT_AND2(), BIT_NAND2(), BIT_XOR() and BIT_XOR2().

Approved by: re (marius)

MFC r318794, r318795:
Update the "first appeared in" version in several manual pages.

Sponsored by: The FreeBSD Foundation

MFC r306773:

Add link for vrefl(9).

Merge r317444, r317445:

UMA_ZONE_REFCNT was removed.

PR: 209715
PR: 218887

MFC r316057:

Document EVENTHANDLER_DEFINE(9).

Sponsored by: DARPA, AFRL

MFC r316056:

The cn_consume was removed in r296716.

Sponsored by: DARPA, AFRL

MFC r315798:

DB_COMMAND(9): fix mandoc markup

Start new sentences on new lines.

MFC r315795:

alq(9): fix mandoc markup

Start new sentence on a new line.

MFC r315803:

memguard(9): fix igor/manlint warnings

- Expand a contraction [1].
- Add a missing section number when referring to uma(9) with .Xr .

MFC r315802:

ifnet(9): fix some igor/manlint warnings

- Fix typos (queueing -> queuing) [1].
- Add missing section number for polling .Xr reference [2].

MFC r315804:

PCI_IOV_*INIT(9): fix make manlint warnings

Add missing section number when referring to PCI_IOV_*INIT(9) with .Xr
from the other corresponding manpage.

MFC r315797:

buf_ring(9): fix mandoc markup

Remove spurious trailing comma after `buf_ring_peek` in the NAME
section.

MFC r315796:

bus_alloc_resource(9): fix mandoc markup

Add missing comma after `.Nm bus_alloc_resource_any` in NAME section.

MFC r315280 r315287

When the RTC is adjusted, reevaluate absolute sleep times based on the RTC

POSIX 2008 says this about clock_settime(2):

If the value of the CLOCK_REALTIME clock is set via clock_settime(),
the new value of the clock shall be used to determine the time
of expiration for absolute time services based upon the
CLOCK_REALTIME clock. This applies to the time at which armed
absolute timers expire. If the absolute time requested at the
invocation of such a time service is before the new value of
the clock, the time service shall expire immediately as if the
clock had reached the requested time normally.

Setting the value of the CLOCK_REALTIME clock via clock_settime()
shall have no effect on threads that are blocked waiting for
a relative time service based upon this clock, including the
nanosleep() function; nor on the expiration of relative timers
based upon this clock. Consequently, these time services shall
expire when the requested relative interval elapses, independently
of the new or old value of the clock.

When the real-time clock is adjusted, such as by clock_settime(3),
wake any threads sleeping until an absolute real-clock time.
Such a sleep is indicated by a non-zero td_rtcgen. The sleep functions
will set that field to zero and return zero to tell the caller
to reevaluate its sleep duration based on the new value of the clock.

At present, this affects the following functions:

pthread_cond_timedwait(3)
pthread_mutex_timedlock(3)
pthread_rwlock_timedrdlock(3)
pthread_rwlock_timedwrlock(3)
sem_timedwait(3)
sem_clockwait_np(3)

I'm working on adding clock_nanosleep(2), which will also be affected.

Reported by: Sebastian Huber <sebastian.huber@embedded-brains.de>
Relnotes: yes
Sponsored by: Dell EMC

MFC r313436,r313437,r313438,r314587,r315687:

r313436:

Clarify #includes for hexdump(3) vs sbuf_hexdump(9)

hexdump(3) only requires libutil.h, whereas sbuf_hexdump(9) requires
sys/types.h (for ssize_t) and sys/sbuf.h

r313437:

Create link from hexdump(3) to sbuf_hexdump(9) as the manpage describes
sbuf_hexdump(9)'s behavior

r313438:

Clean up trailing and leading whitespace for variables to make it
consistent with the rest of the file and style.Makefile(9) a bit
more

r314587:

Correct MLINKS for sbuf_hexdump(9)

sbuf_hexdump(9) should be linked to sbuf(9), not hexdump(3). Another
review will be posted to deduplicate the sbuf_hexdump reference in
in hexdump(3) or at the very least make the information less duplicative.

r315687:

Document sbuf_hexdump(9) in just sbuf(9)

- Remove duplicate references to sbuf_hexdump(9) from hexdump(3).
sbuf_hexdump(9) already pointed back to hexdump(3) for implementation
details.
- Refer to sbuf_hexdump(9) instead of sbuf(9) for completeness

MFC r311168,r311171:

Add the upcoming atomic_fcmpset family to the atomic(9) man page.

These primitives give the caller the read value if the exchange attempt
failed which saves an explicit reload for cmpset loops.

The man page was partially submitted by kib.

==

Fix typo

MFC r302548:
Belatedly remove CSUM_IP_FRAGS and CSUM_FRAGMENT offloading
capabilities. It was removed in r243624 and r254804/r271006
respectively.
This file and mbuf(9) needs updates for other offloading
capabilities(i.e. CSUM_SCTP and CSUM_TSO).

MFC r308637:

Fix function prototypes in usbdi(9) man page, and tweak it a little.

MFC r307000, r307001:

mbuf(9), mbuf_tags(9): fix function prototypes.

- Add m_getclr(9) symlink to ObsoleteFiles.inc (removed in r295481).
- Add const qualifiers in m_dup(), m_dup_pkthdr() and m_tag_copy_chain()
(r286450).
- Fix m_dup_pkthdr() definition (it's not the same as m_move_pkthdr()).

MFC r306441 and r306634:
While draining a timeout task prevent the taskqueue_enqueue_timeout()
function from restarting the timer.

Commonly taskqueue_enqueue_timeout() is called from within the task
function itself without any checks for teardown. Then it can happen
the timer stays active after the return of taskqueue_drain_timeout(),
because the timeout and task is drained separately.

This patch factors out the teardown flag into the timeout task itself,
allowing existing code to stay as-is instead of applying a teardown
flag to each and every of the timeout task consumers.

Add assert to taskqueue_drain_timeout() which prevents parallel
execution on the same timeout task.

Update manual page documenting the return value of
taskqueue_enqueue_timeout().

Differential Revision: https://reviews.freebsd.org/D8012
Reviewed by: kib, trasz

MFC 305751: Make device_quiet() an attachment property.

In particular, reset the DF_QUIET flag when detaching from a device so
that a driver that marks a device quiet doesn't dictate policy for a
different driver that may claim the device in the future.

Sponsored by: Chelsio Communications

MFC 305502: Reset PCI pass through devices via PCI-e FLR during VM start/end.

Add routines to trigger a function level reset (FLR) of a PCI-express
device via the PCI-express device control register. This also includes
support routines to wait for pending transactions to complete as well
as calculating the maximum completion timeout permitted by a device.

Change the ppt(4) driver to reset pass through devices before attaching
to a VM during startup and before detaching from a VM during shutdown.

Sponsored by: Chelsio Communications

MFC 304858,305485,305497: Fix various issues with PCI pass through and VT-d.

304858:
Enable I/O MMU when PCI pass through is first used.

Rather than enabling the I/O MMU when the vmm module is loaded,
defer initialization until the first attempt to pass a PCI device
through to a guest. If the I/O MMU fails to initialize or is not
present, than fail the attempt to pass a PCI device through to a
guest.

The hw.vmm.force_iommu tunable has been removed since the I/O MMU is
no longer enabled during boot. However, the I/O MMU support can be
disabled by setting the hw.vmm.iommu.enable tunable to 0 to prevent
use of the I/O MMU on any systems where it is buggy.

305485:
Leave ppt devices in the host domain when they are not attached to a VM.

This allows a pass through device to be reset to a normal device driver
on the host and reused on the host. ppt devices are now always active in
some I/O MMU domain when the I/O MMU is active, either the host domain
or the domain of a VM they are attached to.

305497:
Update the I/O MMU in bhyve when PCI devices are added and removed.

When the I/O MMU is active in bhyve, all PCI devices need valid entries
in the DMAR context tables. The I/O MMU code does a single enumeration
of the available PCI devices during initialization to add all existing
devices to a domain representing the host. The ppt(4) driver then moves
pass through devices in and out of domains for virtual machines as needed.
However, when new PCI devices were added at runtime either via SR-IOV or
HotPlug, the I/O MMU tables were not updated.

This change adds a new set of EVENTHANDLERS that are invoked when PCI
devices are added and deleted. The I/O MMU driver in bhyve installs
handlers for these events which it uses to add and remove devices to
the "host" domain.

Sponsored by: Chelsio Communications

MFC 305248: Remove warning about pci_addr_t being different sizes.

pci_addr_t has always been 64-bits since r163805.

MFC 303721: Permit the name of the /dev/iov entry to be set by the driver.

The PCI_IOV option creates character devices in /dev/iov for each PF
device driver that registers support for creating VFs. By default the
character device is named after the PF device (e.g. /dev/iov/foo0).
This change adds a variant of pci_iov_attach() called pci_iov_attach_name()
that allows the name of the /dev/iov entry to be specified by the
driver.

To preserve the ABI, this version does not modify the existing
PCI_IOV_ATTACH kobj method as was done in HEAD. Instead, a new
PCI_IOV_ATTACH_NAME method has been added that accepts the name as an
additional parameter. The PCI bus driver now provides an implementation
of PCI_IOV_ATTACH_NAME. A default implementation of PCI_IOV_ATTACH is
provided that calls PCI_IOV_ATTACH_NAME passing 'device_get_nameunit(dev)'
as the name.

Sponsored by: Chelsio Communications

MFC r305692:
Add FPU_KERN_NOCTX flag to the fpu_kern_enter() function on amd64.

MFC r303425:
Add callout_when(9).

MFC r303919:
Fix indentation.

MFC r303519

Fix two return types in the cpuset(9) and bitset(9) man pages

The *_FFS() and *_COUNT() functions return int, not size_t.

Approved by: re (gjb)
Sponsored by: Dell Inc.

MFC r303211:
Implement mtx_trylock_spin(9).

Approved by: re (gjb)

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

The paradigm of a callout is that it has three consequent states:
not scheduled -> scheduled -> running -> not scheduled. The API and the
manual page assume that, some comments in the code assume that, and looks
like some contributors to the code also did. The problem is that this
paradigm isn't true. A callout can be scheduled and running at the same
time, which makes API description ambigouous. In such case callout_stop()
family of functions/macros should return 1 and 0 at the same time, since it
successfully unscheduled future callout but the current one is running.
Before this change we returned 1 in such a case, with an exception that
if running callout was migrating we returned 0, unless CS_MIGRBLOCK was
specified.

With this change, we now return 0 in case if future callout was unscheduled,
but another one is still in action, indicating to API users that resources
are not yet safe to be freed.

However, the sleepqueue code relies on getting 1 return code in that case,
and there already was CS_MIGRBLOCK flag, that covered one of the edge cases.
In the new return path we will also use this flag, to keep sleepqueue safe.

Since the flag CS_MIGRBLOCK doesn't block migration and now isn't limited to
migration edge case, rename it to CS_EXECUTING.

This change fixes panics on a high loaded TCP server.

Reviewed by: jch, hselasky, rrs, kib
Approved by: re (gjb)
Differential Revision: https://reviews.freebsd.org/D7042

Document support for alternate TCP stacks.

Differential Revision: https://reviews.freebsd.org/D6940
Reviewed by: hiren
Approved by: re (gjb)
Sponsored by: Juniper Networks

Add pci_get_max_payload() to fetch the PCI-express maximum payload size.

Approved by: re (gjb)
MFC after: 2 weeks
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D6951

Fix a bunch of "xref refers to *this* page" igor(1) warnings.

MFC after: 1 month

Fix typos.

MFC after: 1 month

Fix some trailing whitespaces.

MFC after: 1 month

Fix a bunch of "sentence not on new line" warnings in section 9.

MFC after: 1 month

Introduce a per-VNET flag to enable/disable netisr prcessing on that VNET.
Add accessor functions to toggle the state per VNET.
The base system (vnet0) will always enable itself with the normal
registration. We will share the registered protocol handlers in all
VNETs minimising duplication and management.
Upon disabling netisr processing for a VNET drain the netisr queue from
packets for that VNET.

Update netisr consumers to (de)register on a per-VNET start/teardown using
VNET_SYS(UN)INIT functionality.

The change should be transparent for non-VIMAGE kernels.

Reviewed by: gnn (, hiren)
Obtained from: projects/vnet
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D6691

Remove the BUGS entry in memguard's man page.

UMA refcounting is gone as of r296243, so this bug no longer exists. In
particular, it's now possible to guard mbuf clusters with memguard.

The pr_destroy field does not allow us to run the teardown code in a
specific order. VNET_SYSUNINITs however are doing exactly that.
Thus remove the VIMAGE conditional field from the domain(9) protosw
structure and replace it with VNET_SYSUNINITs.
This also allows us to change some order and to make the teardown functions
file local static.
Also convert divert(4) as it uses the same mechanism ip(4) and ip6(4) use
internally.

Slightly reshuffle the SI_SUB_* fields in kernel.h and add a new ones, e.g.,
for pfil consumers (firewalls), partially for this commit and for others
to come.

Reviewed by: gnn, tuexen (sctp), jhb (kernel.h)
Obtained from: projects/vnet
MFC after: 2 weeks
X-MFC: do not remove pr_destroy
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D6652

Be more clear about LOCKLEAF being exclusive and add LOCKSHARED.

Add sglist functions for working with arrays of VM pages.

sglist_count_vmpages() determines the number of segments required for
a buffer described by an array of VM pages. sglist_append_vmpages()
adds the segments described by such a buffer to an sglist. The latter
function is largely pulled from sglist_append_bio(), and
sglist_append_bio() now uses sglist_append_vmpages().

Reviewed by: kib
Sponsored by: Chelsio Communications

Add new bus methods for mapping resources.

Add a pair of bus methods that can be used to "map" resources for direct
CPU access using bus_space(9). bus_map_resource() creates a mapping and
bus_unmap_resource() releases a previously created mapping. Mappings are
described by 'struct resource_map' object. Pointers to these objects can
be passed as the first argument to the bus_space wrapper API used for bus
resources.

Drivers that wish to map all of a resource using default settings
(for example, using uncacheable memory attributes) do not need to change.
However, drivers that wish to use non-default settings can now do so
without jumping through hoops.

First, an RF_UNMAPPED flag is added to request that a resource is not
implicitly mapped with the default settings when it is activated. This
permits other activation steps (such as enabling I/O or memory decoding
in a device's PCI command register) to be taken without creating a
mapping. Right now the AGP drivers don't set RF_ACTIVE to avoid using
up a large amount of KVA to map the AGP aperture on 32-bit platforms.
Once RF_UNMAPPED is supported on all platforms that support AGP this
can be changed to using RF_UNMAPPED with RF_ACTIVE instead.

Second, bus_map_resource accepts an optional structure that defines
additional settings for a given mapping.

For example, a driver can now request to map only a subset of a resource
instead of the entire range. The AGP driver could also use this to only
map the first page of the aperture (IIRC, it calls pmap_mapdev() directly
to map the first page currently). I will also eventually change the
PCI-PCI bridge driver to request mappings of the subset of the I/O window
resource on its parent side to create mappings for child devices rather
than passing child resources directly up to nexus to be mapped. This
also permits bridges that do address translation to request suitable
mappings from a resource on the "upper" side of the bus when mapping
resources on the "lower" side of the bus.

Another attribute that can be specified is an alternate memory attribute
for memory-mapped resources. This can be used to request a
Write-Combining mapping of a PCI BAR in an MI fashion. (Currently the
drivers that do this call pmap_change_attr() directly for x86 only.)

Note that this commit only adds the MI framework. Each platform needs
to add support for handling RF_UNMAPPED and thew new
bus_map/unmap_resource methods. Generally speaking, any drivers that
are calling rman_set_bustag() and rman_set_bushandle() need to be
updated.

Discussed on: arch
Reviewed by: cem
Differential Revision: https://reviews.freebsd.org/D5237

Remove dangling references to rman_await_resource().

This function was removed when RF_TIMESHARE was removed a couple of years
ago.

MFC after: 3 days

Per Ravi Pokala's suggestion, rewrite the g_reset_bio description to
be clearer. It also describes it with more nuance. Add missing MLINKS
noticed by trasz@. Bump the date.

Don't repeat the the word 'the'

(one manual change to fix grammar)

Confirmed With: db
Approved by: secteam (not really, but this is a comment typo fix)

Add a pcib interface for use by interrupt controllers that need to
translate the pci rid to a controller ID. The translation could be based
on the 'msi-map' OFW property, a similar ACPI option, or hard-coded for
hardware lacking the above options.

Reviewed by: wma
Obtained from: ABT Systems Ltd
Sponsored by: The FreeBSD Foundation

Re-commit r299467 having fixed the build:

Add a new get_id interface to pci and pcib. This will allow us to both
detect failures, and get different PCI IDs.

For the former the interface returns an int to signal an error. The ID is
returned at a uintptr_t * argument.

For the latter there is a type argument that allows selecting the ID type.
This only specifies a single type, however a MSI type will be added
to handle the need to find the ID the hardware passes to the ARM GICv3
interrupt controller.

A follow up commit will be made to remove pci_get_rid.

Reviewed by: jhb, rstone (previous version)
Obtained from: ABT Systems Ltd
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D6239

atomic: Add testandclear on i386/amd64

Reviewed by: kib
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6381

Revert r299467 to fix the kernel build.

$ svn merge -c -299467 .

Approved by: build being broken for six hours

Add a new get_id interface to pci and pcib. This will allow us to both
detect failures, and get different PCI IDs.

For the former the interface returns an int to signal an error. The ID is
returned at a uintptr_t * argument.

For the latter there is a type argument that allows selecting the ID type.
This only specifies a single type, however a MSI type will be added
to handle the need to find the ID the hardware passes to the ARM GICv3
interrupt controller.

A follow up commit will be made to remove pci_get_rid.

Reviewed by: jhb, rstone
Obtained from: ABT Systems Ltd
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D6239

Add a missing section to a cross-reference.

While here, add bus_space(9) to the SEE ALSO section.

Bump date. Forgotten in r299312.

Document g_reset_bio(). This is long overdue. g_reset_bio will reset
the bio to a pristine state should you wish to re-use it for another
I/O without freeing it. In the bast, a simple bzero was done to do
this, but that may not be sufficient in the future when the bio may
contain state that's not part of the documented API. Besides, it makes
the code clearer as to the intent...

Noticed by: smh@

Add a new bus method to fetch device-specific CPU sets.

bus_get_cpus() returns a specified set of CPUs for a device. It accepts
an enum for the second parameter that indicates the type of cpuset to
request. Currently two valus are supported:

- LOCAL_CPUS (on x86 this returns all the CPUs in the package closest to
the device when DEVICE_NUMA is enabled)
- INTR_CPUS (like LOCAL_CPUS but only returns 1 SMT thread for each core)

For systems that do not support NUMA (or if it is not enabled in the kernel
config), LOCAL_CPUS fails with EINVAL. INTR_CPUS is mapped to 'all_cpus'
by default. The idea is that INTR_CPUS should always return a valid set.

Device drivers which want to use per-CPU interrupts should start using
INTR_CPUS instead of simply assigning interrupts to all available CPUs.
In the future we may wish to add tunables to control the policy of
INTR_CPUS (e.g. should it be local-only or global, should it ignore
SMT threads or not).

The x86 nexus driver exposes the internal set of interrupt CPUs from the
the x86 interrupt code via INTR_CPUS.

The ACPI bus driver and PCI bridge drivers use _PXM to return a suitable
LOCAL_CPUS set when _PXM exists and DEVICE_NUMA is enabled. They also and
the global INTR_CPUS set from the nexus driver with the per-domain set from
_PXM to generate a local INTR_CPUS set for child devices.

Compared to the r298933, this version uses 'struct _cpuset' in
<sys/bus.h> instead of 'cpuset_t' to avoid requiring <sys/param.h>
(<sys/_cpuset.h> still requires <sys/param.h> for MAXCPU even though
<sys/_bitset.h> does not after recent changes).

kern: Add phashinit_flags(), which allows malloc(M_NOWAIT)

It will be used for the upcoming LRO hash table initialization.
And probably will be useful in other cases, when M_WAITOK can't
be used.

Reviewed by: jhb, kib
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6138

Revert bus_get_cpus() for now.

I really thought I had run this through the tinderbox before committing,
but many places need <sys/types.h> -> <sys/param.h> for <sys/bus.h> now.

Add a new bus method to fetch device-specific CPU sets.

bus_get_cpus() returns a specified set of CPUs for a device. It accepts
an enum for the second parameter that indicates the type of cpuset to
request. Currently two valus are supported:

- LOCAL_CPUS (on x86 this returns all the CPUs in the package closest to
the device when DEVICE_NUMA is enabled)
- INTR_CPUS (like LOCAL_CPUS but only returns 1 SMT thread for each core)

For systems that do not support NUMA (or if it is not enabled in the kernel
config), LOCAL_CPUS fails with EINVAL. INTR_CPUS is mapped to 'all_cpus'
by default. The idea is that INTR_CPUS should always return a valid set.

Device drivers which want to use per-CPU interrupts should start using
INTR_CPUS instead of simply assigning interrupts to all available CPUs.
In the future we may wish to add tunables to control the policy of
INTR_CPUS (e.g. should it be local-only or global, should it ignore
SMT threads or not).

The x86 nexus driver exposes the internal set of interrupt CPUs from the
the x86 interrupt code via INTR_CPUS.

The ACPI bus driver and PCI bridge drivers use _PXM to return a suitable
LOCAL_CPUS set when _PXM exists and DEVICE_NUMA is enabled. They also and
the global INTR_CPUS set from the nexus driver with the per-domain set from
_PXM to generate a local INTR_CPUS set for child devices.

Reviewed by: wblock (manpage)
Differential Revision: https://reviews.freebsd.org/D5519

Spelling fixes supplied by pfg@, detected with codespell, plus
additional misspellings detected by igor.

MFC after: 1 week

Add some notes about the implicit resource mapping for activated resources.

Specifically, mention that rman_get_bustag/handle/virtual are valid after
a resource is activated. Also, mention the wrapper API that accepts a
struct resource instead of a bus tag and handle.

Document RF_PREFETCHABLE.

Document PCI_RES_BUS as a possible resource type.

Remove a stale reference to the removed RF_TIMESHARE flag.

Add a new rescan method to the bus interface.

The BUS_RESCAN() method rescans a single bus device checking for devices
that have been added or removed from the bus. A new 'rescan' command is
added to devctl(8) to trigger a rescan.

Differential Revision: https://reviews.freebsd.org/D6016

osd(9): Change array pointer to array pointer type from void*

This is a minor follow-up to r297422, prompted by a Coverity warning. (It's
not a real defect, just a code smell.) OSD slot array reservations are an
array of pointers (void **) but were cast to void* and back unnecessarily.
Keep the correct type from reservation to use.

osd.9 is updated to match, along with a few trivial igor fixes.

Reported by: Coverity
CID: 1353811
Sponsored by: EMC / Isilon Storage Division

Correct types for g_example_start() and g_example_access().

PR: 203498
Submitted by: chadf@triularity.org, ae
MFC after: 1 week
Sponsored by: Essen Hackathon 2016

Improve upon r296618 to keep lines < 80 characters.

Pointed out by: jhb
Sponsored by: Essen Hackathon 2016

Merge the projects/release-pkg branch to head.

This allows packaging the base system with pkg(8), including
but not limited to providing the ability to provide upstream
binary update possibilities for non-tier-1 architectures.

This merge is a requirement of the 11.0-RELEASE, and as such,
thank you to everyone that has tested the project branch.

Documentation in build(7) etc. is still somewhat sparse, but
updates to those parts will follow.

Sponsored by: The FreeBSD Foundation

Add osd_reserve() and osd_set_reserved(), which allow M_WAITOK allocation
of an OSD array,

Reword descriptions of asserting locks held without WITNESS.

This corrects an error in r296947 in that it is not possible to assert
which thread holds a shared (or read) lock, but it is possible to assert
that one is held. Just not very useful.

MFC after: 1 week
Submitted by: wblock, jhb
Reviewed by: kib (earlier version), jhb, wblock
Sponsored by: EMC / Isilon Storage Division
Differential Revision: https://reviews.freebsd.org/D5659

Fix two more unhappy instances of "user land".

Submitted by: bdrewery
MFC after: 1 week

Fix bunch of .Xrs.

MFC after: 1 month
Sponsored by: The FreeBSD Foundation

Change a little to match what appears to be the right way of specifying an argument
(from looking at other man pages)

MFC after: 1 week
Sponsored by: Panzura inc

Add a few details that make it easier to use this macro.

MFC after: 1 week
Sponsored by: Panzura inc

Remove incorrect BUGS entry about asserting lock not held.

For non-WITNESS< assertion support for SA_UNLOCKED was added in r125421 and
made to panic in r126316.

MFC after: 1 week

Improve the implementation and documentation of the
SYSCTL_COUNTER_U64_ARRAY() macro.

- Add proper asserts to the SYSCTL_COUNTER_U64_ARRAY() macro that checks
the size of the first element of the array.
- Add an example to the counter(9) manual page how to use the
SYSCTL_COUNTER_U64_ARRAY() macro.
- Add some missing symbolic links for counter(9) while at it.

fail.9: Bump Dd

fail(9): Upstreaming some fail point enhancements

This is several year's worth of fail point upgrades done at EMC Isilon. They
are interdependent enough that it makes sense to put a single diff up for them.
Primarily, we added:

- Changing all mainline execution paths to be lockless, which lets us use fail
points in more sleep-sensitive areas, and allows more parallel execution
- A number of additional commands, including 'pause' that lets us do some
interesting deterministic repros of race conditions
- The ability to dump the stacks of all threads sleeping on a fail point
- A number of other API changes to allow marking up the fail point's context in
the code, and firing callbacks before and after execution
- A man page update

Submitted by: Matthew Bryan <matthew.bryan@isilon.com>
Reviewed by: cem (earlier version), jhb, kib, pho
With feedback from: bdrewery
Sponsored by: EMC / Isilon Storage Division
Differential Revision: https://reviews.freebsd.org/D5427

Provide sysctl(9) macro to deal with array of counter(9).

Reword SX_NOADAPTIVE description to be clear that adaptive is default.

The default changed in r193011.

MFC after: 1 week

Fix mdoc markup.

Remove self-reference to destroy_dev_drain(9).

MFC after: 1 week

Document m_catpkt(), and remove misinformation about m_cat(9).

Since m_cat() may copy data from the second mbuf chain into the last mbuf
of the first chain, it may free the first mbuf of the second chain. Thus,
the second chain is not guaranteed to be valid after m_cat() returns.

Reviewed by: glebius
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D5497

Remove taskqueue_enqueue_fast().

taskqueue_enqueue() was changed to support both fast and non-fast
taskqueues 10 years ago in r154167. It has been a compat shim ever
since. It's time for the compat shim to go.

Submitted by: Howard Su <howard0su@gmail.com>
Reviewed by: sephe
Differential Revision: https://reviews.freebsd.org/D5131

ddb(9) -> ddb(4)

MFC after: 1 month
Sponsored by: The FreeBSD Foundation

Add the bus_alloc_resource_anywhere() convenience function.

Summary:
Many instances of bus_alloc_resource() simply use 0 and ~0 for start and end to
denote 'anywhere' with a given count. To clean this up, introduce a
bus_alloc_resource_anywhere() convenience function.

Bump __FreeBSD_version for the new API.

Reviewed By: jhb
Differential Revision: https://reviews.freebsd.org/D5370

Fix year.

Noted by: bdrewery
MFC after: 2 weeks

Remove references to Giant in the description of vrele(9). Add notes
about vnode lock and sleeping.

Reported by: julian
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks

As <machine/param.h> is included from <sys/param.h>, there is no need
to include it explicitly when <sys/param.h> is already included.

Reviewed by: alc, kib
Differential Revision: https://reviews.freebsd.org/D5378

As <machine/pmap.h> is included from <vm/pmap.h>, there is no need to
include it explicitly when <vm/pmap.h> is already included.

Reviewed by: alc, kib
Differential Revision: https://reviews.freebsd.org/D5373

Rename netinet/tcp_cc.h to netinet/cc/cc.h.

Discussed with: lstewart

Convert rman to use rman_res_t instead of u_long

Summary:
Migrate to using the semi-opaque type rman_res_t to specify rman resources. For
now, this is still compatible with u_long.

This is step one in migrating rman to use uintmax_t for resources instead of
u_long.

Going forward, this could feasibly be used to specify architecture-specific
definitions of resource ranges, rather than baking a specific integer type into
the API.

This change has been broken out to facilitate MFC'ing drivers back to 10 without
breaking ABI.

Reviewed By: jhb
Sponsored by: Alex Perez/Inertial Computing
Differential Revision: https://reviews.freebsd.org/D5075

Document that hashinit(9) can wait for memory to be available

Also tweak nearby grammar while here.

Submitted by: Daniel O'Connor (original version)

Provide new socket option TCP_CCALGOOPT, which stands for TCP congestion
control algorithm options. The argument is variable length and is opaque
to TCP, forwarded directly to the algorithm's ctl_output method.

Provide new includes directory netinet/cc, where algorithm specific
headers can be installed.

The new API doesn't yet have any in tree consumers.

The original code written by lstewart.
Reviewed by: rrs, emax
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D711

Add vrefl(), a locked variant of vref(9).

This API has no in-tree consumers at the moment but is useful to at least
one out-of-tree consumer, and naturally complements existing vnode refcount
functions (vholdl(9), vdropl(9)).

Obtained from: kib (sys/ portion)
Sponsored by: EMC / Isilon Storage Division
Differential Revision: https://reviews.freebsd.org/D4947
Differential Revision: https://reviews.freebsd.org/D4953

Read-only is hyphenated when it modifies a noun.

Fix issues found by mandoc -Tlint.

MFC after: 1 week

Provide yet another KPI for cdev creation, make_dev_s(9).

Immediate problem fixed by the new KPI is the long-standing race
between device creation and assignments to cdev->si_drv1 and
cdev->si_drv2, which allows the window where cdevsw methods might be
called with si_drv1,2 fields not yet set. Devices typically checked
for NULL and returned spurious errors to usermode, and often left some
methods unchecked.

The new function interface is designed to be extensible, which should
allow to add more features to make_dev_s(9) without inventing yet
another name for function to create devices, while maintaining KPI and
even KBI backward-compatibility.

Reviewed by: hps, jhb
Sponsored by: The FreeBSD Foundation
MFC after: 3 weeks
Differential revision: https://reviews.freebsd.org/D4746

Add accessor methods to fetch the BAR holding the MSI-X table and PBA.

While here, explicitly note the requirement that the BAR(s) must be
allocated prior to calling pci_alloc_msix().

Reviewed by: andrew, emaste
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D4688

Add a safety net to reclaim mbufs when one of the mbuf zones become
exhausted.

It is possible for a bug in the code (or, theoretically, even unusual
network conditions) to exhaust all possible mbufs or mbuf clusters.
When this occurs, things can grind to a halt fairly quickly. However,
we currently do not call mb_reclaim() unless the entire system is
experiencing a low-memory condition.

While it is best to try to prevent exhaustion of one of the mbuf zones,
it would also be useful to have a mechanism to attempt to recover from
these situations by freeing "expendable" mbufs.

This patch makes two changes:

a) The patch adds a generic API to the UMA zone allocator to set a
function that should be called when an allocation fails because the
zone limit has been reached. Because of the way this function can be
called, it really should do minimal work.

b) The patch uses this API to try to free mbufs when an allocation
fails from one of the mbuf zones because the zone limit has been
reached. The function schedules a callout to run mb_reclaim().

Differential Revision: https://reviews.freebsd.org/D3864
Reviewed by: gnn
Comments by: rrs, glebius
MFC after: 2 weeks
Sponsored by: Juniper Networks

A change to KPI of vm_pager_get_pages() and underlying VOP_GETPAGES().

o With new KPI consumers can request contiguous ranges of pages, and
unlike before, all pages will be kept busied on return, like it was
done before with the 'reqpage' only. Now the reqpage goes away. With
new interface it is easier to implement code protected from race
conditions.

Such arrayed requests for now should be preceeded by a call to
vm_pager_haspage() to make sure that request is possible. This
could be improved later, making vm_pager_haspage() obsolete.

Strenghtening the promises on the business of the array of pages
allows us to remove such hacks as swp_pager_free_nrpage() and
vm_pager_free_nonreq().

o New KPI accepts two integer pointers that may optionally point at
values for read ahead and read behind, that a pager may do, if it
can. These pages are completely owned by pager, and not controlled
by the caller.

This shifts the UFS-specific readahead logic from vm_fault.c, which
should be file system agnostic, into vnode_pager.c. It also removes
one VOP_BMAP() request per hard fault.

Discussed with: kib, alc, jeff, scottl
Sponsored by: Nginx, Inc.
Sponsored by: Netflix

Fix a copy and paste bug when this page was first written by copying from
BUS_BIND_INTR.9.

MFC after: 1 week

Actually add the proc_rwmem(9) man page, missed in r291961.

Add helper functions proc_readmem() and proc_writemem().

These helper functions can be used to read in or write a buffer from or to
an arbitrary process' address space. Without them, this can only be done
using proc_rwmem(), which requires the caller to fill out a uio. This is
onerous and results in code duplication; the new functions provide a simpler
interface which is sufficient for most existing callers of proc_rwmem().

This change also adds a manual page for proc_rwmem() and the new functions.

Reviewed by: jhb, kib
Differential Revision: https://reviews.freebsd.org/D4245

Fix a comment typo in the code example.

PR: 203497
Submitted by: chadf@triularity.org
MFC after: 1 week

Add an MLINK for m_collapse.

PR: 204205
Submitted by: avos
MFC after: 1 week

style.9: Add a small blurb about allowing bool

It was allowed before, but make it very explicit it is allowed now. And
prefer 'bool' to older types that were used for the same purpose -- int and
boolean_t.

Like with the C99 fixed-width types, use common sense when changing old
code.

No igor regressions.

Suggested by: bde <20151205031713.T3286@besplex.bde.org>
Reviewed by: glebius, davide, bapt (earlier versions)
Reviewed by: imp
Feedback from: julian
Sponsored by: EMC / Isilon Storage Division
Differential Revision: https://reviews.freebsd.org/D4384

The cdevpriv_dtr_t typedef was not able to be used in a function prototype
like the various d_*_t typedefs since it declared a function pointer rather
than a function. Add a new d_priv_dtor_t typedef that declares the function
and can be used as a function prototype. The previous typedef wasn't
useful outside of the cdevpriv implementation, so retire it.

The name d_priv_dtor_t was chosen to be more consistent with cdev methods
since it is commonly used in place of d_close_t even though it is not a
direct pointer in struct cdevsw.

Reviewed by: kib, imp
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D4340

Bump .Dd

Recommend cc -Wall instead of gcc -Wall

MFC after: 1 week

Consistently enforce the restriction against calling malloc/free when in a
critical section.

uma_zalloc_arg()/uma_zalloc_free() may acquire a sleepable lock on the
zone. The malloc() family of functions may call uma_zalloc_arg() or
uma_zalloc_free().

The malloc(9) man page currently claims that free() will never sleep.
It also implies that the malloc() family of functions will not sleep
when called with M_NOWAIT. However, it is more correct to say that
these functions will not sleep indefinitely. Indeed, they may acquire
a sleepable lock. However, a developer may overlook this restriction
because the WITNESS check that catches attempts to call the malloc()
family of functions within a critical section is inconsistenly
applied.

This change clarifies the language of the malloc(9) man page to clarify
the restriction against calling the malloc() family of functions
while in a critical section or holding a spin lock. It also adds
KASSERTs at appropriate points to make the enforcement of this
restriction more consistent.

PR: 204633
Differential Revision: https://reviews.freebsd.org/D4197
Reviewed by: markj
Approved by: gnn (mentor)
Sponsored by: Juniper Networks

Add vlog(9).

Reviewed by: cem, jhb
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D4183

This fixes several places where callout_stops return is examined. The
new return codes of -1 were mistakenly being considered "true". Callout_stop
now returns -1 to indicate the callout had either already completed or
was not running and 0 to indicate it could not be stopped. Also update
the manual page to make it more consistent no non-zero in the callout_stop
or callout_reset descriptions.

MFC after: 1 Month with associated callout change.

kern_testfrwk.9: Clean up manual page style

Igor has many less complaints now. I think the two remaining are bogus, but I
am also not sure why Igor is producing them.

The page still needs more work.

Sponsored by: EMC / Isilon Storage Division

Some basic documentation (a man page) on kern_testfrwk

Add the MLINK for async_drain Thanks Edward for the pointer.

MFC after: 1 month

Add new async_drain to the callout system. This is so-far not used but
should be used by TCP for sure in its cleanup of the IN-PCB (will be coming shortly).

Sponsored by: Netflix Inc.
Differential Revision: https://reviews.freebsd.org/D4076

Add a manual page for PHOLD() and friends.

MFC after: 1 week

Another follow-up to r290475: Bump .Dd in sysctl_add_oid.9

Sponsored by: EMC / Isilon Storage Division

Round out SYSCTL macros to the full set of fixed-width types

Add S8, S16, S32, and U32 types; add SYSCTL*() macros for them, as well
as for the existing 64-bit types. (While SYSCTL*QUAD and UQUAD macros
already exist, they do not take the same sort of 'val' parameter that
the other macros do.)

Clean up the documented "types" in the sysctl.9 document. (These are
macros and thus not real types, but the manual page documents intent.)

The sysctl_add_oid(9) arg2 has been bumped from intptr_t to intmax_t to
accommodate 64-bit types on 32-bit pointer architectures.

This is just the kernel support piece; the userspace sysctl(1) support
will follow in a later patch.

Submitted by: Ravi Pokala <rpokala@panasas.com>
Reviewed by: cem
Relnotes: no
Sponsored by: Panasas
Differential Revision: https://reviews.freebsd.org/D4091

remove \, it confuses things.

Add a new helper function for PCI devices to locate the upstream
PCI-express root port of a given PCI device.

Reviewed by: kib, imp
MFC after: 1 week
Sponsored by: Chelsio
Differential Revision: https://reviews.freebsd.org/D4089

Add helper routines for PCI device drivers to read, write, and modify
PCI-Express capability registers (that is, PCI config registers in the
standard PCI config space belonging to the PCI-Express capability
register set).

Note that all of the current PCI-e registers are either 16 or 32-bits,
so only widths of 2 or 4 bytes are supported.

Reviewed by: imp
MFC after: 1 week
Sponsored by: Chelsio
Differential Revision: https://reviews.freebsd.org/D4088

BUS_ADD_CHILD calls device_add_child. device_add_child does not call
BUS_ADD_CHILD. Make it explicit since it follows the command paradigm
rather than the callback paradigm. Add other clarifying notes as well.

sysctl(9): Document U8/U16 types from r289773

Suggested by: ngie
Sponsored by: EMC / Isilon Storage Division

getenv.9: Document behavior of freeenv(NULL)

Fix a couple igor(1)-indicated spelling issues while here.

Suggested by: jhb
Sponsored by: EMC / Isilon Storage Division

cpuset.9: Link to/from the new page

A follow-up to r289667.

Sponsored by: EMC / Isilon Storage Division

Document cpuset(9)

A follow-up to r289467.

Coerced by: jhb
Sponsored by: EMC / Isilon Storage Division

Document bitset(9)

Remove MLINKS to more non-existent mbuf(9) macros

X-MFC with: r288295
MFC after: 3 days
Sponsored by: EMC / Isilon Storage Division

Posthumously remove all references to MFREE(9)

The macro was removed in r90227

MFC after: 3 days
Sponsored by: EMC / Isilon Storage Division

Document the interface for applying advice up to the end of a file.

MFC after: 3 days

Document bus_get_resource(9).

Suggested by: Francois Tigeot
Obtained from: DragonFlyBSD 09301a2b29f3ae5edd39a858f909f8770372f71e
Sponsored by: EMC / Isilon Storage Division

Revert r287780 until more developers have their say.

Differential Revision: https://reviews.freebsd.org/D3521
Requested by: gnn

Bump .Dd.

Implement callout_drain_async(), inspired by the projects/hps_head
branch.

This function is used to drain a callout via a callback instead of
blocking the caller until the drain is complete. Refer to the
callout_drain_async() manual page for a detailed description.

Limitation: If a lock is used with the callout, the callout can only
be drained asynchronously one time unless the callout_init_mtx()
function is called again. This limitation is not present in
projects/hps_head and will require more invasive changes to the
timeout code, which was not in the scope of this patch.

Differential Revision: https://reviews.freebsd.org/D3521
Reviewed by: wblock
MFC after: 1 month

Document stack_save_td(9) and stack_save_td_running(9).

Reviewed by: wblock
Sponsored by: EMC / Isilon Storage Division
Differential Revision: https://reviews.freebsd.org/D3243

Expose an interface to determine if an ACE is inherited.

Submitted by: sef
Reviewed by: trasz
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D3540

nv.h lives in sys/ as of r279439.

New 1-Wire bus implementation. 1-Wire controller is abstracted, though
only gpiobus configured via FDT is supported. Bus enumeration is
supported. Devices are created for each device found. 1-Wire
temperature controllers are supported, but other drivers could be
written. Temperatures are polled and reported via a sysctl. Errors
are reported via sysctl counters. Mis-wired bus detection is included
for more trouble shooting. See ow(4), owc(4) and ow_temp(4) for
details of what's supported and known issues.

This has been tested on Raspberry Pi-B, Pi2 and Beagle Bone Black
with up to 7 devices.

Differential Revision: https://reviews.freebsd.org/D2956
Relnotes: yes
MFC after: 2 weeks
Reviewed by: loos@ (with many insightful comments)

Remove reference to non-existent kern_openat(9).

MFC after: 3 days
Sponsored by: EMC / Isilon Storage Division

Add link for rw_unlock(9) to rwlock(9).

MFC after: 3 days
Sponsored by: EMC / Isilon Storage Division

Add support for the arrays in nvlist library.

- Add
nvlist_{add,get,take,move,exists,free}_{number,bool,string,nvlist,
descriptor} functions.
- Add support for (un)packing arrays.
- Add the nvl_array_next field to the nvlist structure.
If an array is added by the nvlist_{move,add}_nvlist_array function
this field will contains next element in the array.
- Add the nitems field to the nvpair and nvpair_header structure.
This field contains number of elements in the array.
- Add special flag (NV_FLAG_IN_ARRAY) which is set if nvlist is a part of
an array.
- Add special type (NV_TYPE_NVLIST_ARRAY_NEXT).This type is used only
on packing/unpacking.
- Add new API for traversing arrays (nvlist_get_array_next).
- Add the nvlist_get_pararr function which combines the
nvlist_get_array_next and nvlist_get_parent functions. If nvlist is in
the array it will return next element from array. If nvlist is last
element in array or it isn't in array it will return his
container (parent). This function should simplify traveling over nvlist.
- Add tests for new features.
- Add documentation for new functions.
- Add my copyright.
- Regenerate the sys/cddl/compat/opensolaris/sys/nvpair.h file.

PR: 191083
Reviewed by: allanjude (doc)
Approved by: pjd (mentor)

Stop describing an acquire operation as a read barrier and a release
operation as a write barrier. That description has never been correct,
and it has caused confusion. An acquire operation orders writes as well
as reads, and a release operation orders reads as well as writes.

Also, explicitly say that a thread doesn't see its own accesses being
reordered. The reordering of a thread's accesses is only (potentially)
visible to another thread. Thus, memory barriers need only be used to
control the ordering of accesses between threads, not within a thread.

Reviewed by: bde, kib
Discussed with: jhb
MFC after: 1 week

Fix mandoc warnings/errors.

MFC after: 1 week

Make the nvlist_next(9) function handle NULL pointer variable.
This simplifies removing the first element from nvlist.

Reviewed by: AllanJude
Approved by: pjd (mentor)

Revise the text about the atomicity of the defined operations across
multiple processors. In particular, clearly state that the operations
are always atomic when they are applied to the default memory type
that is used by the kernel (and applications).

Reviewed by: kib, jhb (an earlier version)
MFC after: 1 week

Create man page for pmap_quick_enter_page(9) and pmap_quick_remove_page(9)

Reviewed by: kib, brueffer, wblock
Approved by: kib (mentor)
Differential Revision: https://reviews.freebsd.org/D3312

Revert r286236; vgonel() is a static function.

Sponsored by: The FreeBSD Foundation

Document vgonel(9).

MFC after: 1 month
Sponsored by: The FreeBSD Foundation

mark this function as deprecated, and put the warning first, since I
doubt most people will read to the end... Note the use of sys/cdefs.h
for pre-C11 compilers...

I didn't included a note about being compatibile w/ userland since a
C11 feature should be obviously usable in userland...

Suggested by: imp

The implementation note isn't true anymore..

Not that anyone reads it, but those that do, remind them that this
isn't usable in userland... I can't wait till this doc is wrong..

Teach sysctl about the new optional suffix after IK to specify
precision. Update input as well. Add IK to the manual (it was missing
completely).

Differential Revision: https://reviews.freebsd.org/D3181

Update Capsicum and Mandatory Access Control manual pages
to no longer claim they are experimental.

Reviewed by: rwatson@, wblock@
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D2985

Fix a small typo: "the the".

Spotted by: wblock

Implement the CloudABI random_get() system call.

The random_get() system call works similar to getentropy()/getrandom()
on OpenBSD/Linux. It fills a buffer with random data.

This change introduces a new function, read_random_uio(), that is used
to implement read() on the random devices. We can call into this
function from within the CloudABI compatibility layer.

Approved by: secteam
Reviewed by: jmg, markm, wblock
Obtained from: https://github.com/NuxiNL/freebsd
Differential Revision: https://reviews.freebsd.org/D3053

Markup fixes.

Fix a typo and duplicate word.

some additional improvements to the documentation...

Sponsored by: Netflix, Inc.

yet more documentation improvements... Many changes were made to the
OCF w/o documentation...

Document the new (8+ year old) device_t way of handling things, that
_unregister_all will leave no threads in newsession, the _SYNC flag,
the requirement that a flag be specified...

Other minor changes like breaking up a wall of text into paragraphs...

Replace use of .Po Pc with the preferred .Pq for single line
enclosures in iovctl.conf(5), iovctl(8), pci(9), and
pci_iov_schema(9).

Differential Revision: https://reviews.freebsd.org/D3000
Reviewed by: wblock
Approved by: jmallett (mentor)

The results of the vote are in. This reflects that vote. Single
line statements inside of braces is recognized as an acceptable
style.
http://reviews.freebsd.org/V3
As always, this isn't license for wholesale change, etc.

Rename the dtrace-* man pages to dtrace_* for consistency with other
subsection man pages (e.g. geom_*, mac_*, snd_*).

Document the locking context for the directly dispatched callouts.
Cross-reference timeout(9).

Sponsored by: The FreeBSD Foundation
MFC after: 1 week

Move nvlist documentation to the FreeBSD Kernel Developer's sections.

Approved by: pjd (mentor)

more word smithing wrt the crd_inject field...

We've already defined IV earlier, so no need to expand it a second
time here...

update the documentation of the _IV_ flags... _IV_PRESENT doesn't
mean what you think it should... This will be fixed in the future
with a flag rename, but document what the flag really does and make
the _IV_ flags clear what their presents (or lack there of) means...

Reviewed by: gnn, eri (both earlier version)

add units to the length and count so that it's clear what they
are measured in... Gems like: "len is the length of the buffer."
aren't useful in man pages.

Updated random(4) boot/shutdown scripting.
Fix the man pages as well.

Differential Revision: https://reviews.freebsd.org/D2924
Approved by: so (delphij)

Huge cleanup of random(4) code.

* GENERAL
- Update copyright.
- Make kernel options for RANDOM_YARROW and RANDOM_DUMMY. Set
neither to ON, which means we want Fortuna
- If there is no 'device random' in the kernel, there will be NO
random(4) device in the kernel, and the KERN_ARND sysctl will
return nothing. With RANDOM_DUMMY there will be a random(4) that
always blocks.
- Repair kern.arandom (KERN_ARND sysctl). The old version went
through arc4random(9) and was a bit weird.
- Adjust arc4random stirring a bit - the existing code looks a little
suspect.
- Fix the nasty pre- and post-read overloading by providing explictit
functions to do these tasks.
- Redo read_random(9) so as to duplicate random(4)'s read internals.
This makes it a first-class citizen rather than a hack.
- Move stuff out of locked regions when it does not need to be
there.
- Trim RANDOM_DEBUG printfs. Some are excess to requirement, some
behind boot verbose.
- Use SYSINIT to sequence the startup.
- Fix init/deinit sysctl stuff.
- Make relevant sysctls also tunables.
- Add different harvesting "styles" to allow for different requirements
(direct, queue, fast).
- Add harvesting of FFS atime events. This needs to be checked for
weighing down the FS code.
- Add harvesting of slab allocator events. This needs to be checked for
weighing down the allocator code.
- Fix the random(9) manpage.
- Loadable modules are not present for now. These will be re-engineered
when the dust settles.
- Use macros for locks.
- Fix comments.

* src/share/man/...
- Update the man pages.

* src/etc/...
- The startup/shutdown work is done in D2924.

* src/UPDATING
- Add UPDATING announcement.

* src/sys/dev/random/build.sh
- Add copyright.
- Add libz for unit tests.

* src/sys/dev/random/dummy.c
- Remove; no longer needed. Functionality incorporated into randomdev.*.

* live_entropy_sources.c live_entropy_sources.h
- Remove; content moved.
- move content to randomdev.[ch] and optimise.

* src/sys/dev/random/random_adaptors.c src/sys/dev/random/random_adaptors.h
- Remove; plugability is no longer used. Compile-time algorithm
selection is the way to go.

* src/sys/dev/random/random_harvestq.c src/sys/dev/random/random_harvestq.h
- Add early (re)boot-time randomness caching.

* src/sys/dev/random/randomdev_soft.c src/sys/dev/random/randomdev_soft.h
- Remove; no longer needed.

* src/sys/dev/random/uint128.h
- Provide a fake uint128_t; if a real one ever arrived, we can use
that instead. All that is needed here is N=0, N++, N==0, and some
localised trickery is used to manufacture a 128-bit 0ULLL.

* src/sys/dev/random/unit_test.c src/sys/dev/random/unit_test.h
- Improve unit tests; previously the testing human needed clairvoyance;
now the test will do a basic check of compressibility. Clairvoyant
talent is still a good idea.
- This is still a long way off a proper unit test.

* src/sys/dev/random/fortuna.c src/sys/dev/random/fortuna.h
- Improve messy union to just uint128_t.
- Remove unneeded 'static struct fortuna_start_cache'.
- Tighten up up arithmetic.
- Provide a method to allow eternal junk to be introduced; harden
it against blatant by compress/hashing.
- Assert that locks are held correctly.
- Fix the nasty pre- and post-read overloading by providing explictit
functions to do these tasks.
- Turn into self-sufficient module (no longer requires randomdev_soft.[ch])

* src/sys/dev/random/yarrow.c src/sys/dev/random/yarrow.h
- Improve messy union to just uint128_t.
- Remove unneeded 'staic struct start_cache'.
- Tighten up up arithmetic.
- Provide a method to allow eternal junk to be introduced; harden
it against blatant by compress/hashing.
- Assert that locks are held correctly.
- Fix the nasty pre- and post-read overloading by providing explictit
functions to do these tasks.
- Turn into self-sufficient module (no longer requires randomdev_soft.[ch])
- Fix some magic numbers elsewhere used as FAST and SLOW.

Differential Revision: https://reviews.freebsd.org/D2025
Reviewed by: vsevolod,delphij,rwatson,trasz,jmg
Approved by: so (delphij)

The barriers, provided by _acq and _rel atomics, are acquire and
release barriers, not read and write barriers. They fence all memory
accesses from the respective side, not limited by the kind of
operation.

Reviewed by: jhb
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

Back out contested change until dispute is resolved. This proved to be
more contentious than I expected.

Document title should be in CAPS.

Remove EOL whitespace.

Bump date.

Submitted by: Xin Li

Update style.9 to reflect consensus on developer's mailing list
allowing redundant braces.

Differential Revision: https://reviews.freebsd.org/D2842

Deshallify.

Add META_MODE support.

Off by default, build behaves normally.
WITH_META_MODE we get auto objdir creation, the ability to
start build from anywhere in the tree.

Still need to add real targets under targets/ to build packages.

Differential Revision: D2796
Reviewed by: brooks imp

Add support for reading MAM attributes to camcontrol(8) and libcam(3).

MAM is Medium Auxiliary Memory and is most commonly found as flash
chips on tapes.

This includes support for reading attributes and decoding most
known attributes, but does not yet include support for writing
attributes or reporting attributes in XML format.

libsbuf/Makefile:
Add subr_prf.c for the new sbuf_hexdump() function. This
function is essentially the same function.

libsbuf/Symbol.map:
Add a new shared library minor version, and include the
sbuf_hexdump() function.

libsbuf/Version.def:
Add version 1.4 of the libsbuf library.

libutil/hexdump.3:
Document sbuf_hexdump() alongside hexdump(3), since it is
essentially the same function.

camcontrol/Makefile:
Add attrib.c.

camcontrol/attrib.c:
Implementation of READ ATTRIBUTE support for camcontrol(8).

camcontrol/camcontrol.8:
Document the new 'camcontrol attrib' subcommand.

camcontrol/camcontrol.c:
Add the new 'camcontrol attrib' subcommand.

camcontrol/camcontrol.h:
Add a function prototype for scsiattrib().

share/man/man9/sbuf.9:
Document the existence of sbuf_hexdump() and point users to
the hexdump(3) man page for more details.

sys/cam/scsi/scsi_all.c:
Add a table of known attributes, text descriptions and
handler functions.

Add a new scsi_attrib_sbuf() function along with a number
of other related functions that help decode attributes.

scsi_attrib_ascii_sbuf() decodes ASCII format attributes.

scsi_attrib_int_sbuf() decodes binary format attributes, and
will pass them off to scsi_attrib_hexdump_sbuf() if they're
bigger than 8 bytes.

scsi_attrib_vendser_sbuf() decodes the vendor and drive
serial number attribute.

scsi_attrib_volcoh_sbuf() decodes the Volume Coherency
Information attribute that LTFS writes out.

sys/cam/scsi/scsi_all.h:
Add a number of attribute-related structure definitions and
other defines.

Add function prototypes for all of the functions added in
scsi_all.c.

sys/kern/subr_prf.c:
Add a new function, sbuf_hexdump(). This is the same as
the existing hexdump(9) function, except that it puts the
result in an sbuf.

This also changes subr_prf.c so that it can be compiled in
userland for includsion in libsbuf.

We should work to change this so that the kernel hexdump
implementation is a wrapper around sbuf_hexdump() with a
statically allocated sbuf with a drain. That will require
a drain function that goes to the kernel printf() buffer
that can take a non-NUL terminated string as input.
That is because an sbuf isn't NUL-terminated until it is
finished, and we don't want to finish it while we're still
using it.

We should also work to consolidate the userland hexdump and
kernel hexdump implemenatations, which are currently
separate. This would also mean making applications that
currently link in libutil link in libsbuf.

sys/sys/sbuf.h:
Add the prototype for sbuf_hexdump(), and add another copy
of the hexdump flag values if they aren't already defined.

Ideally the flags should be defined in one place but the
implemenation makes it difficult to do properly. (See
above.)

Sponsored by: Spectra Logic Corporation
MFC after: 1 week

Create a separate kobj interface for leaf-driver PCI IOV methods.

Leaf drivers should not import the PCI bus interface to add IOV handling.
Instead, move the IOV client methods to a separate kobj interface.

Differential Revision: https://reviews.freebsd.org/D2584
Reviewed by: rstone

Remove a reference to the PBDRY flag, which itself was removed in r248470.

MFC after: 3 days

Fixup to the kern_psignal manpage

r283105 misspelled kern_psignal as kernel_psignal in one occurrence, and
added trailing whitespace.

While here, change 'call' to the more standard 'function', and say why
the name was changed (taken from the commit message for r225617).

Only several years late, catch the psignal man page up to the
fact that psignal has been renamed to kern_psignal since 9.0.

MFC after: 1 week

Remove references to Giant in namei(9). This was removed in r241896.

MFC after: 1 week
Sponsored by: EMC / Isilon Storage Division

Make vpanic() externally visible so that it can be called as part of the
DTrace panic() action.

Differential Revision: https://reviews.freebsd.org/D2349
Reviewed by: avg
MFC after: 2 weeks
Sponsored by: EMC / Isilon Storage Division

Reassign copyright statements on several files from Advanced
Computing Technologies LLC to Hudson River Trading LLC.

Approved by: Hudson River Trading LLC (who owns ACT LLC)
MFC after: 1 week

Always send log(9) messages to the message buffer.

It is truer to the semantics of logging for messages to *always*
go to the message buffer, where they can eventually be collected
and, in fact, be put into a log file.

This restores the behavior prior to r70239, which seems to have
changed it inadvertently.

Submitted by: Eric Badger <eric@badgerio.us>
Reviewed by: jhb
Approved by: kib (mentor)
Obtained from: Dell Inc.
MFC after: 1 week

Add manual pages for the io, ip, proc, sched, tcp and udp DTrace providers.
The format of these pages is somewhat experimental, so they may be subject
to further tweaking.

Differential Revision: https://reviews.freebsd.org/D2170
Reviewed by: bcr, rpaulo
MFC after: 2 weeks

SDT(9): add a section on SDT providers, mentioning the "sdt" provider.
Add examples demonstrating how one can list available providers and the
DTrace probes provided by a provider.

Differential Revision: https://reviews.freebsd.org/D2166
Reviewed by: rpaulo
MFC after: 2 weeks

Add a new flag, SBUF_INCLUDENUL, and new get/set/clear functions for flags.

The SBUF_INCLUDENUL flag causes the nulterm byte at the end of the string
to be counted in the length of the data. If copying the data using the
sbuf_data() and sbuf_len() functions, or if writing it automatically with
a drain function, the net effect is that the nulterm byte is copied along
with the rest of the data.

Document m_collapse().

Reported by: kmacy
Reviewed by: kmacy
MFC after: 1 week
Sponsored by: EMC / Isilon Storage Division

Don't specify a function name in the example SDT(9) probe. As with the
module component, it is a bug that the SDT(9) KPI allows one to specify the
function component of an SDT probe. Currently, the module component is
filled in automatically if left unset; this is not yet true for the function
component, but will be addressed by some ongoing work.

MFC after: 3 days

Finish r194601. Add a cred parameter to the VOP_VPTOCNP(9) manpage.
While here fix igor warning about new line.

Reviewed by: kib

MFC after: 1 Week

Document the interface for defining a configuration schema

Differential Revision: https://reviews.freebsd.org/D89
Reviewed by: wblock, emaste, allanjude
MFC after: 1 month
Sponsored by: Sandvine Inc.

Add manpages for SR-IOV enable/disable driver interface

Differential Revision: https://reviews.freebsd.org/D75
Reviewed by: wblock
MFC after: 1 month
Sponsored by: Sandvine Inc.

Document pci_iov_attach/detach in pci.9

Differential Revision: https://reviews.freebsd.org/D74
Reviewed by: bcr, wblock, emaste
MFC after: 1 month
Sponsored by: Sandvine Inc.

back Xref get_cyclecount to have it get more exposure...

Clean up more usb related files when MK_USB == no when dealing with
manpages, libraries, and binaries

MFC after: 1 week
X-MFC with: r278135
Sponsored by: EMC / Isilon Storage Division

Add note that contigfree(9) does not accept NULL

Differential Revision: https://reviews.freebsd.org/D1721

Rewrite pmap_enter(9) man page.

In collaboration with: alc
Differential Revision: https://reviews.freebsd.org/D1531
Sponsored by: The FreeBSD Foundation and EMC / Isilon Storage Division
MFC after: 1 week

spl man page hasn't been relevant for a while, retire it.

Document the fact that modules declared with SYSCALL_MODULE(9) have their
names prefixed with "sys/".

MFC after: 3 days

Fix usage example in kvprintf(9) and its copy in libstand(3): trailing '\n'
in bitfield argument is wrong, as it will be treated as bit 10, causing any
code printing >=10 bits with bit 10 on as having a trailing comma.

Newline (intended one) should be part of the format string (already present
in the examples).

Also fix grammar and kill EOL whitespace in comment while here.

PR: 195005
Approved by: bdrewery

Revert for r277213:

FreeBSD developers need more time to review patches in the surrounding
areas like the TCP stack which are using MPSAFE callouts to restore
distribution of callouts on multiple CPUs.

Bump the __FreeBSD_version instead of reverting it.

Suggested by: kmacy, adrian, glebius and kib
Differential Revision: https://reviews.freebsd.org/D1438

"softc" is short for "software context", use that phrase in the
device_get_softc(9) man page.

MFC after: 1 week

Major callout subsystem cleanup and rewrite:
- Close a migration race where callout_reset() failed to set the
CALLOUT_ACTIVE flag.
- Callout callback functions are now allowed to be protected by
spinlocks.
- Switching the callout CPU number cannot always be done on a
per-callout basis. See the updated timeout(9) manual page for more
information.
- The timeout(9) manual page has been updated to reflect how all the
functions inside the callout API are working. The manual page has
been made function oriented to make it easier to deduce how each of
the functions making up the callout API are working without having
to first read the whole manual page. Group all functions into a
handful of sections which should give a quick top-level overview
when the different functions should be used.
- The CALLOUT_SHAREDLOCK flag and its functionality has been removed
to reduce the complexity in the callout code and to avoid problems
about atomically stopping callouts via callout_stop(). If someone
needs it, it can be re-added. From my quick grep there are no
CALLOUT_SHAREDLOCK clients in the kernel.
- A new callout API function named "callout_drain_async()" has been
added. See the updated timeout(9) manual page for a complete
description.
- Update the callout clients in the "kern/" folder to use the callout
API properly, like cv_timedwait(). Previously there was some custom
sleepqueue code in the callout subsystem, which has been removed,
because we now allow callouts to be protected by spinlocks. This
allows us to tear down the callout like done with regular mutexes,
and a "td_slpmutex" has been added to "struct thread" to atomically
teardown the "td_slpcallout". Further the "TDF_TIMOFAIL" and
"SWT_SLEEPQTIMO" states can now be completely removed. Currently
they are marked as available and will be cleaned up in a follow up
commit.
- Bump the __FreeBSD_version to indicate kernel modules need
recompilation.
- There has been several reports that this patch "seems to squash a
serious bug leading to a callout timeout and panic".

Kernel build testing: all architectures were built
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D1438
Sponsored by: Mellanox Technologies
Reviewed by: jhb, adrian, sbruno and emaste

Remove no longer used "M_FLOWID" flag and update the netisr manpage.
This patch completes process started by r275358.

Sponsored by: Mellanox Technologies

Fix the counter_u64_alloc arguement

Approved by: glebius
MFC after: 2 weeks

In order to reduce use of M_EXT outside of the mbuf allocator and
socket-buffer implementations, introduce a return value for MCLGET()
(and m_cljget() that underlies it) to allow the caller to avoid testing
M_EXT itself. Update all callers to use the return value.

With this change, very few network device drivers remain aware of
M_EXT; the primary exceptions lie in mbuf-chain pretty printers for
debugging, and in a few cases, custom mbuf and cluster allocation
implementations.

NB: This is a difficult-to-test change as it touches many drivers for
which I don't have physical devices. Instead we've gone for intensive
review, but further post-commit review would definitely be appreciated
to spot errors where changes could not easily be made mechanically,
but were largely mechanical in nature.

Differential Revision: https://reviews.freebsd.org/D1440
Reviewed by: adrian, bz, gnn
Sponsored by: EMC / Isilon Storage Division

Prevent live-lock and access of destroyed data in taskqueue_drain_all().

Phabric: https://reviews.freebsd.org/D1247
Reviewed by: jhb, avg
Sponsored by: Spectra Logic Corporation

sys/kern_subr_taskqueue.c:
Modify taskqueue_drain_all() processing to use a temporary
"barrier task", rather than rely on a user task that may
be destroyed during taskqueue_drain_all()'s execution. The
barrier task is queued behind all previously queued tasks
and then has its priority elevated so that future tasks
cannot pass it in the queue.

Use a similar barrier scheme to drain threads processing
current tasks. This requires taskqueue_run_locked() to
insert and remove the taskqueue_busy object for the running
thread for every task processed.

share/man/man9/taskqueue.9:
Remove warning about live-lock issues with taskqueue_drain_all()
and indicate that it does not wait for tasks queued after
it begins processing.

Mention cc_cdg.

Replace CC_VAR with CCV, since the CC_VAR macro doesn't exist.
While here, add MLINK for CCV.9 and DECLARE_CC_MODULE.9.

Fix various mdoc issues and some EOL whitespace.

Found with: mandoc -Tlint

Properly sort Xr to silence mandoc warnings.

Differential Revision: https://reviews.freebsd.org/D1314
Reviewed by: wblock
MFC after: 1 Month

Add _NEW flag to mtx(9), sx(9), rmlock(9) and rwlock(9).
A _NEW flag passed to _init_flags() to avoid check for double-init.

Differential Revision: https://reviews.freebsd.org/D1208
Reviewed by: jhb, wblock
MFC after: 1 Month

Add some new modes to OpenCrypto. These modes are AES-ICM (can be used
for counter mode), and AES-GCM. Both of these modes have been added to
the aesni module.

Included is a set of tests to validate that the software and aesni
module calculate the correct values. These use the NIST KAT test
vectors. To run the test, you will need to install a soon to be
committed port, nist-kat that will install the vectors. Using a port
is necessary as the test vectors are around 25MB.

All the man pages were updated. I have added a new man page, crypto.7,
which includes a description of how to use each mode. All the new modes
and some other AES modes are present. It would be good for someone
else to go through and document the other modes.

A new ioctl was added to support AEAD modes which AES-GCM is one of them.
Without this ioctl, it is not possible to test AEAD modes from userland.

Add a timing safe bcmp for use to compare MACs. Previously we were using
bcmp which could leak timing info and result in the ability to forge
messages.

Add a minor optimization to the aesni module so that single segment
mbufs don't get copied and instead are updated in place. The aesni
module needs to be updated to support blocked IO so segmented mbufs
don't have to be copied.

We require that the IV be specified for all calls for both GCM and ICM.
This is to ensure proper use of these functions.

Obtained from: p4: //depot/projects/opencrypto
Relnotes: yes
Sponsored by: FreeBSD Foundation
Sponsored by: NetGate

callout(9): add sbt flavors of callout_schedule

Differential Revision: https://reviews.freebsd.org/D1161 (partial)
Reviewed by: jhb, markj
MFC after: 1 week

Misc mdoc fixes:

- Remove superfluous paragraph macros.
- Remove/fix empty or incorrect macros.
- Sort sections into conventional order.
- Terminate quoted strings properly.
- Remove EOL whitespace.

Create a vimage.9 link to vnet.9

Requested by: glebius

MFp4: @179066

Add page which describes VNET network stack virtualization infrastructure.

Submitted by: bz
Sponsored by: The FreeBSD Foundation
Sponsored by: CK Software GmbH

Finish r274118: remove useless fields from struct domain.

Sponsored by: Yandex LLC

Fix two issues with lockmgr(9) LK_CAN_SHARE() test, which determines
whether the shared request for already shared-locked lock could be
granted. Both problems result in the exclusive locker starvation.

The concurrent exclusive request is indicated by either
LK_EXCLUSIVE_WAITERS or LK_EXCLUSIVE_SPINNERS flags. The reverse
condition, i.e. no exclusive waiters, must check that both flags are
cleared.

Add a flag LK_NODDLKTREAT for shared lock request to indicate that
current thread guarantees that it does not own the lock in shared
mode. This turns back the exclusive lock starvation avoidance code;
see man page update for detailed description.

Use LK_NODDLKTREAT when doing lookup(9).

Reported and tested by: pho
No objections from: attilio
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks

Add type qualifier volatile to the base (userspace) address argument
of fuword(9) and suword(9). This makes the functions type-compatible
with volatile objects and does not require devolatile force, e.g. in
kern_umtx.c.

Requested by: bde
Reviewed by: jhb
Sponsored by: The FreeBSD Foundation
MFC after: 3 weeks

Actually install casuword(9) to fix build.

Add fueword(9) and casueword(9) functions. They are like fuword(9)
and casuword(9), but do not mix value read and indication of fault.

I know (or remember) enough assembly to handle x86 and powerpc. For
arm, mips and sparc64, implement fueword() and casueword() as wrappers
around fuword() and casuword(), which means that the functions cannot
distinguish between -1 and fault.

On architectures where fueword() and casueword() are native, implement
fuword() and casuword() using fueword() and casuword(), to reduce
assembly code duplication.

Sponsored by: The FreeBSD Foundation
Tested by: pho
MFC after: 2 weeks (ia64 needs treating)

minor updates to make it more explicit that when using fpu_kern_thread,
you don't need to use fpu_kern_enter/_leave...

Reviewed by: kib

it is not cast to a pointer of the specified type, it is cast to the
specified type...

mtod(m, uint8_t) does not work, mtod(m, uint8_t *) does work..

spell out the arguments..

the + *offsetp does not belong w/ the type, move it outside the .Fn
macro...

Fix multiple incorrect SYSCTL arguments in the kernel:

- Wrong integer type was specified.

- Wrong or missing "access" specifier. The "access" specifier
sometimes included the SYSCTL type, which it should not, except for
procedural SYSCTL nodes.

- Logical OR where binary OR was expected.

- Properly assert the "access" argument passed to all SYSCTL macros,
using the CTASSERT macro. This applies to both static- and dynamically
created SYSCTLs.

- Properly assert the the data type for both static and dynamic
SYSCTLs. In the case of static SYSCTLs we only assert that the data
pointed to by the SYSCTL data pointer has the correct size, hence
there is no easy way to assert types in the C language outside a
C-function.

- Rewrote some code which doesn't pass a constant "access" specifier
when creating dynamic SYSCTL nodes, which is now a requirement.

- Updated "EXAMPLES" section in SYSCTL manual page.

MFC after: 3 days
Sponsored by: Mellanox Technologies

Add a complete implementation of MurmurHash3. Tweak both implementations
so they match the established idiom. Document them in hash(9).

MFC after: 1 month
MFC with: r272906

Forgot to bump Dd.

Pointy hat to: jhb

Rewrite timeout(9) to be callout(9)-centric instead. Move the description
of timeout(9) to the end and mark it prominently as deprecated. Document
somewhat how times are specified for the 'sbt' variants. Better explain
how using callout_init_*() to associate a lock with a callout resolves
common races.

Differential Revision: https://reviews.freebsd.org/D847
Reviewed by: wblock, bjk
MFC after: 1 week

Bump .Dd

Approved by: kevlo

Reflect the chanages in sleepqueue.h and subr_sleepqueue.c

- Priority argument is introduced to sleepq_*wait* in r177085
- sleepq_calc_signal_retval is removed from implementation
- sleepq_catch_signals is internal now

Differential Revision: https://reviews.freebsd.org/D794
Reviewed by: jhb
Approved by: jhb

Add missing mlinks for section 9.

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation

Remove ifq_drops from struct ifqueue. Now queue drops are accounted in
struct ifnet if_oqdrops.

Some netgraph modules used ifqueue w/o ifnet. Accounting of queue drops
is simply removed from them. There were no API to read this statistic.

Sponsored by: Netflix
Sponsored by: Nginx, Inc.

Remove sys/types.h include as per style (9)

SDT requries sys/param.h due to use of NULL

Reported by: Garrett
Sponsored by: Multiplay

Add dtrace probe support for zfs SET_ERROR(..)

MFC after: 1 week
Sponsored by: Multiplay

Add missing link to TIMEOUT_TASK_INIT(9).

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation

Add missing links to taskqueue(9).

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation

Add a brief description of CTLFLAG_VNET flag. Since the VIMAGE is
absolutely not documented, I see no reason in long descriptions
here.

- Fix argument list after 271387.
- While here fix typo.

Submitted by: markj

Revisions 264905 and 266860 added a "int fib" argument to ifa_ifwithnet and
ifa_ifwithdstaddr. For the sake of backwards compatibility, the new
arguments were added to new functions named ifa_ifwithnet_fib and
ifa_ifwithdstaddr_fib, while the old functions became wrappers around the
new ones that passed RT_ALL_FIBS for the fib argument. However, the
backwards compatibility is not desired for FreeBSD 11, because there are
numerous other incompatible changes to the ifnet(9) API. We therefore
decided to remove it from head but leave it in place for stable/9 and
stable/10. In addition, this commit adds the fib argument to
ifa_ifwithbroadaddr for consistency's sake.

sys/sys/param.h
Increment __FreeBSD_version

sys/net/if.c
sys/net/if_var.h
sys/net/route.c
Add fibnum argument to ifa_ifwithbroadaddr, and remove the _fib
versions of ifa_ifwithdstaddr, ifa_ifwithnet, and ifa_ifwithroute.

sys/net/route.c
sys/net/rtsock.c
sys/netinet/in_pcb.c
sys/netinet/ip_options.c
sys/netinet/ip_output.c
sys/netinet6/nd6.c
Fixup calls of modified functions.

share/man/man9/ifnet.9
Document changed API.

CR: https://reviews.freebsd.org/D458
MFC after: Never
Sponsored by: Spectra Logic

- Add missing "
- Sort sections

Add description of "sysctl_remove_name()" function.

Fix return type of callout_init_rm() and add return type to
callout_deactivate().

PR: 192520
Submitted by: yaneurabeya gmail com
MFC after: 3 days

Fix a typo.

PR: 192294
Submitted by: Conrad Meyer <conrad.meyer@isilon.com>

Retire pmap_change_wiring(). We have never used it to wire virtual pages.
We continue to use pmap_enter() for that. For unwiring virtual pages, we
now use pmap_unwire(), which unwires a range of virtual addresses instead
of a single virtual page.

Sponsored by: EMC / Isilon Storage Division

- Spelling corrections

Suggested by: Garrett Cooper <yaneurabeya@gmail.com>
PR: 192101

- Updated SYSCTL manual pages after recent changes to the kernel
SYSCTL code. Added description of new macros and functions.
- Merged dynamic and static SYSCTL related content into a single
manual page, hence parameters and functionality is very much the same.
- Uppercased all occurrences of "OID".
- Updated all SYSCTL examples.

PR: 192101

Remove trailing comma from ending Xref

MFC after: 3 days
Sponsored by: The FreeBSD Foundation

mdoc: remove superfluous paragraph macro.

Garbage collect couple of unused fields from struct ifaddr:
- ifa_claim_addr() unused since removal of NetAtalk
- ifa_metric seems to be never utilized, always a copy of if_metric

Add VOP_GETVOBJECT.9 to obsolete files, un-xref.

X-MFC with: r269160

Explicitely mention that inactivated or reclaimed vnode is locked
exclusively.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days

Remove man page for non-existent VOPs.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days

Correct the locking statement.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days

- Use Rs/Re mdoc macros.
- Remove duplicate and/or redundant content.

Re-sort synopsis, add includes.

s/PCBGROUPS/PCBGROUP/ manpage to match "options PCBGROUP".

Fixed fallout from previous change.

[mdoc] cleanup

Add the PCBGROUPS manpage.

Thanks to wblock for helping me with this manpage.

Remove obsolete man pages. The corresponding code was removed in r255608.

Remove an obsolete man page.

Fix markups.

Fix markup regression introduced in r268369.

Add a man page for the new function pmap_unwire().

Remove the man page for a pmap function that no longer exists.

Correct the name of the man page for pmap_ts_referenced().

Sponsored by: EMC / Isilon Storage Division

Nuke the never-used RF_TIMESHARE feature, reducing the complexity of the
code. The consensus on arch@ is that this feature might have been useful
in the distant past, but is now just unnecessary bloat.

The int_rman_activate_resource() and int_rman_deactivate_resource()
functions become trivial, so manually inline them.

The special deferred handling of RF_ACTIVE is no longer needed in
reserve_resource_bound(), so eliminate the associated code at the
end of the function.

These changes reduce the object file size by more than 500 bytes on i386.

Update the rman.9 man page to reflect the removal of the RF_TIMESHARE
feature.

MFC after: 2 weeks

Since r202933, kthread_suspend_check() takes no arguments. Update the
example to match.

MFC after: 3 days

Document C_HARDCLOCK flag.

Remove ia64.

This includes:
o All directories named *ia64*
o All files named *ia64*
o All ia64-specific code guarded by __ia64__
o All ia64-specific makefile logic
o Mention of ia64 in comments and documentation

This excludes:
o Everything under contrib/
o Everything under crypto/
o sys/xen/interface
o sys/sys/elf_common.h

Discussed at: BSDcan

use .Mt to mark up email addresses consistently (part6)

PR: 191174
Submitted by: Franco Fichtner <franco at lastsummer.de>

Add fpu_kern.9 man page to the install.

Sponsored by: The FreeBSD Foundation
MFC after: 1 week

Add m_pulldown and m_unshare to MLINKS.

mdoc: remove superfluous paragraph macros.

Several small fixes (typos, grammar, mdoc).

Add documentation for the fpu_kern(9) interfaces.

Many thanks to jmg for reviewing the (previous version) of the text
and providing grammar and content fixes.

Sponsored by: The FreeBSD Foundation
MFC after: 1 week

Catch up with r186809, correct comments.

Catch up with recent changes...

Document some more socket features

Add some mention of the functions used by protocol implementations,
upcalls, and other general routines.

Not all functionality is documented; in particular:
o the *at() variants, which are useful only for implementing the
corresponding syscalls.
o soconnect2(), also only used to implement a syscall (socketpair()).
o sockargs(), which is essentually unused and only tangentially
socket-related.
o selsocket(), which is commented as being present solely for use by
netncp and netsmb.
o getsockaddr(), which is just a convenience shortcut for copyin().

Reviewed by: jhb (previous version)
Approved by: hrs (mentor)

Document taskqueue_start_threads_pinned

Requested by: adrian
Reviewed by: adrian
Approved by: hrs (mentor)
X-MFC-with: r266629

Expand PGET_WANTREAD. Language fixes.

Submitted by: jmg

Documented the pget(9) system kernel interface.

Reviewed by: trociny, kib
MFC after: 1 week

Document m_get2().

Reviewed by: glebius

Change type from int to short to match function prototypes.

Reviewed by: glebius

add a TON of missing event handlers with quite possibly bogus
descrptions... If you're one of the many people who forgot to document
their work and don't like my description, well, do your job and update
it...

add link to crypto(4)...

MFC after: 1 week

Update the SDT(9) examples to reflect the removal of the sname parameter
in r258622.

MFC after: 3 days

Add support for event timers whose clock frequency can change while running.

fix up an old email address and drop clause 3 of my copyright...

bump date..

MFC after: 1 week

Rename global cnt to vm_cnt to avoid shadowing.

To reduce the diff struct pcu.cnt field was not renamed, so
PCPU_OP(cnt.field) is still used. pc_cnt and pcpu are also used in
kvm(3) and vmstat(8). The goal was to not affect externally used KPI.

Bump __FreeBSD_version_ in case some out-of-tree module/code relies on the
the global cnt variable.

Exp-run revealed no ports using it directly.

No objection from: arch@
Sponsored by: EMC / Isilon Storage Division

Update NetBSD Foundation copyrights to 2-clause BSD

The NetBSD Foundation states "Third parties are encouraged to change the
license on any files which have a 4-clause license contributed to the
NetBSD Foundation to a 2-clause license."

This change removes clauses 3 and 4 from copyright / license blocks that
list The NetBSD Foundation as the only copyright holder.

Sponsored by: The FreeBSD Foundation

share/man/man9/counter.9
Fix logic error in the description of counter_u64_alloc: the command
may fail only if M_NOWAIT is specified, not M_WAITOK.

Reviewed by: glebius
MFC after: 2 weeks
Sponsored by: Spectra Logic Corporation

Garbage collect long time obsoleted (or never used) stuff from routing API.

Remove AppleTalk support.

AppleTalk was a network transport protocol for Apple Macintosh devices
in 80s and then 90s. Starting with Mac OS X in 2000 the AppleTalk was
a legacy protocol and primary networking protocol is TCP/IP. The last
Mac OS X release to support AppleTalk happened in 2009. The same year
routing equipment vendors (namely Cisco) end their support.

Thus, AppleTalk won't be supported in FreeBSD 11.0-RELEASE.

multiple: Remove 3rd clause from BSD license where approved by the
regents and renumber.

This patch skips files in contrib/ and crypto/

Acked by: imp
Discussed with: emaste

Remove IPX support.

IPX was a network transport protocol in Novell's NetWare network operating
system from late 80s and then 90s. The NetWare itself switched to TCP/IP
as default transport in 1998. Later, in this century the Novell Open
Enterprise Server became successor of Novell NetWare. The last release
that claimed to still support IPX was OES 2 in 2007. Routing equipment
vendors (e.g. Cisco) discontinued support for IPX in 2011.

Thus, IPX won't be supported in FreeBSD 11.0-RELEASE.

- Remove rt_metrics_lite and simply put its members into rtentry.
- Use counter(9) for rt_pksent (former rt_rmx.rmx_pksent). This
removes another cache trashing ++ from packet forwarding path.
- Create zini/fini methods for the rtentry UMA zone. Via initialize
mutex and counter in them.
- Fix reporting of rmx_pksent to routing socket.
- Fix netstat(1) to report "Use" both in kvm(3) and sysctl(3) mode.

The change is mostly targeted for stable/10 merge. For head,
rt_pksent is expected to just disappear.

Discussed with: melifaro
Sponsored by: Netflix
Sponsored by: Nginx, Inc.

Fix a typo, C_ALSOLUTE -> C_ABSOLUTE.

update taskqueue(9) manual page

Many thanks to bjk, gjb and pluknet for improvements and suggestions.

MFC after: 5 days
Sponsored by: HybridCluster

Remove obsolete vnode(9) man page references.

PR: docs/186537
Submitted by: Miklos Magyari <miklos@magyari.hu>
MFC after: 3 days

sysctl_handle_counter_u64() doesn't use arg2 argument, thus simplify
the SYSCTL_COUNTER_U64() macro.

Sponsored by: Nginx, Inc.

Provide macros that allow easily export uma(9) zone limits and
current usage via sysctl(9):

SYSCTL_UMA_MAX()
SYSCTL_ADD_UMA_MAX()
SYSCTL_UMA_CUR()
SYSCTL_ADD_UMA_CUR()

Sponsored by: Nginx, Inc.

Add back reference to buf(9) removed in r32223 as buf(9) was added
in r42016.

Approved by: bapt (mentor)