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2010-03-06MAINTAINERS: document and add "Q" patchwork queue entriesJoe Perches
Patchwork queues show the acceptance/rejection state of submitted patches for various MAINTAINER trees. Document their existence. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-03-06MAINTAINERS: WAVELAN moved to stagingJoe Perches
by commit 0234f84ebb00d36c48062befa5436eef36b71ccd Update patterns Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-03-06MAINTAINERS: STARMODE RADIO IP (STRIP) moved to stagingJoe Perches
by commit 955015bb0b42167d14f776ff5947ae2463a974dc Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-03-06MAINTAINERS: update PERFORMANCE EVENTS F: patternsJoe Perches
To match arch/*/kernel perf_event location changes Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-03-06MAINTAINERS: remove HAYES ESP SERIAL DRIVERJoe Perches
Commit f53a2ade0bb9f2a81f473e6469155172a96b7c38 ("tty: esp: remove broken driver") removed it Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-03-06MAINTAINERS: remove AMD GEODE F: arch/x86/kernel/geode_32.cJoe Perches
Commit c95d1e53ed89b75a4d7b68d1cbae4607b1479243 ("cs5535: drop the Geode-specific MFGPT/GPIO code") removed it. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-03-05Merge branch 'kvm-updates/2.6.34' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds
* 'kvm-updates/2.6.34' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (145 commits) KVM: x86: Add KVM_CAP_X86_ROBUST_SINGLESTEP KVM: VMX: Update instruction length on intercepted BP KVM: Fix emulate_sys[call, enter, exit]()'s fault handling KVM: Fix segment descriptor loading KVM: Fix load_guest_segment_descriptor() to inject page fault KVM: x86 emulator: Forbid modifying CS segment register by mov instruction KVM: Convert kvm->requests_lock to raw_spinlock_t KVM: Convert i8254/i8259 locks to raw_spinlocks KVM: x86 emulator: disallow opcode 82 in 64-bit mode KVM: x86 emulator: code style cleanup KVM: Plan obsolescence of kernel allocated slots, paravirt mmu KVM: x86 emulator: Add LOCK prefix validity checking KVM: x86 emulator: Check CPL level during privilege instruction emulation KVM: x86 emulator: Fix popf emulation KVM: x86 emulator: Check IOPL level during io instruction emulation KVM: x86 emulator: fix memory access during x86 emulation KVM: x86 emulator: Add Virtual-8086 mode of emulation KVM: x86 emulator: Add group9 instruction decoding KVM: x86 emulator: Add group8 instruction decoding KVM: do not store wqh in irqfd ... Trivial conflicts in Documentation/feature-removal-schedule.txt
2010-03-03Merge branch 'for_linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/mjg59/platform-drivers-x86 * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mjg59/platform-drivers-x86: (45 commits) compal-laptop: Make it depend on CONFIG_RFKILL classmate-laptop: Added some keys present in other devices MAINTAINERS: Add git tree to x86 Platform Drivers asus-acpi: remove duplicate comparison of asus_model strings toshiba-acpi: fix multimedia keys on some machines dell-laptop: Fix errors on failure and exit paths dell-laptop: Fix build error by making buffer_mutex static asus-laptop: fix style problems reported by checkpath.pl asus-laptop: use device_create_file() instead of platform_group asus-laptop: clean led code asus-laptop: add gps rfkill asus-laptop: set initial lcd state asus-laptop: leds, remove dead code and fix asus_led_exit()/asus_led_init() asus-laptop: add backlight changes notifications asus-laptop: add bluetooth keys found on M9V asus-laptop: switch to sparse keymap library asus-laptop: rename wireless_status to wlan_status to avoid confusion asus-laptop: add error check for write_acpi_int calls asus-laptop: stop using ASUS_HANDLE and use relative methods instead asus-laptop: rename function talking directly to acpi with asus_xxx scheme ...
2010-03-01MAINTAINERS: Add git tree to x86 Platform DriversThadeu Lima de Souza Cascardo
Add the x86 platform driver git tree to MAINTAINERS. Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
2010-03-01KVM: powerpc: Change maintainerAlexander Graf
Progress on KVM for Embedded PowerPC has stalled, but for Book3S there's quite a lot of work to do and going on. So in agreement with Hollis and Avi, we should switch maintainers for PowerPC. Signed-off-by: Alexander Graf <agraf@suse.de> Acked-by: Hollis Blanchard <hollis@penguinppc.org> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-02-28Merge branch 'master' of /home/davem/src/GIT/linux-2.6/David S. Miller
Conflicts: drivers/firmware/iscsi_ibft.c
2010-02-28Merge branch 'core-rcu-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (44 commits) rcu: Fix accelerated GPs for last non-dynticked CPU rcu: Make non-RCU_PROVE_LOCKING rcu_read_lock_sched_held() understand boot rcu: Fix accelerated grace periods for last non-dynticked CPU rcu: Export rcu_scheduler_active rcu: Make rcu_read_lock_sched_held() take boot time into account rcu: Make lockdep_rcu_dereference() message less alarmist sched, cgroups: Fix module export rcu: Add RCU_CPU_STALL_VERBOSE to dump detailed per-task information rcu: Fix rcutorture mod_timer argument to delay one jiffy rcu: Fix deadlock in TREE_PREEMPT_RCU CPU stall detection rcu: Convert to raw_spinlocks rcu: Stop overflowing signed integers rcu: Use canonical URL for Mathieu's dissertation rcu: Accelerate grace period if last non-dynticked CPU rcu: Fix citation of Mathieu's dissertation rcu: Documentation update for CONFIG_PROVE_RCU security: Apply lockdep-based checking to rcu_dereference() uses idr: Apply lockdep-based diagnostics to rcu_dereference() uses radix-tree: Disable RCU lockdep checking in radix tree vfs: Abstract rcu_dereference_check for files-fdtable use ...
2010-02-27Merge branch 'master' of ↵David S. Miller
git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6
2010-02-26Merge branch 'for_linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/mjg59/platform-drivers-x86 * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mjg59/platform-drivers-x86: toshiba_acpi: Add full hotkey support hp-wmi: Add support for tablet rotation key dell-laptop: Add another Dell laptop to the DMI whitelist classmate-laptop: use a single MODULE_DEVICE_TABLE to get correct aliases dell-laptop: Pay attention to which devices the hardware switch controls dell-laptop: Use buffer with 32-bit physical address dell-laptop: Blacklist machines not supporting dell-laptop dell-laptop: Block software state changes when rfkill hard blocked dell-laptop: Fix small memory leak dell-laptop: Fix platform device unregistration dell-laptop: Update rfkill state on kill switch compal-laptop: Replace sysfs support with rfkill support compal-laptop: Add support for known Compal made Dell laptops MAINTAINERS: update drivers/platform/x86 information
2010-02-26Merge branch 'ibft-fixes' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/konrad/ibft-2.6 * 'ibft-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/ibft-2.6: ibft: Update MAINTAINERS file. drivers/firmware/iscsi_ibft.c: remove NIPQUAD_FMT, use %pI4
2010-02-26Merge branch 'v4l_for_linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6 * 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6: (362 commits) V4L-DVB: cx88-dvb: remove extra attribution for core V4L/DVB: v4l: soc_camera: fix bound checking of mbus_fmt[] index V4L/DVB: Add support for SMT7020 to cx88 V4L/DVB: radio-si470x: Use UTF-8 encoding on a comment V4L/DVB: MAINTAINERS: Telegent tlg2300 section fix V4L/DVB: gspca_stv06xx: Add support for camera button V4L/DVB: gspca_ov519: add support for the button on ov511 based cams V4L/DVB: gspca_ov519: Add support for the button on ov518 based cams V4L/DVB: gspca_ov519: add support for the button on ov519 based cams V4L/DVB: gspca_main: Fix a compile error when CONFIG_INPUT is not set V4L/DVB: gspca_main: some input error handling fixes V4L/DVB: gspca_main: Allow use of input device creation code for non int. inputs V4L/DVB: gspca_pac7302: much improved exposure control V4L/DVB: gspca_sonixb: Make sonixb driver handle pas106 and pas202 cameras V4L/DVB: gspca_sonixb: pas106: fixup bright ctrl and add gain and exposure ctrls V4L/DVB: Documentation: gspca.txt: update known mr97310a cams V4L/DVB: gspca_mr97310a: add support for the Sakar 1638x CyberPix V4L/DVB: gscpa_sonixb: limit ov7630 max framerate at 640x480 V4L/DVB: gspca_sonixb: pas202: fixup brightness ctrl and add gain and exposure ctrls V4L/DVB: gscpa_sonixb: Differentiate between sensors with a coarse and fine expo ctrl ...
2010-02-26Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (158 commits) [SCSI] Fix printing of failed 32-byte commands [SCSI] Fix printing of variable length commands [SCSI] libsrp: fix bug in ADDITIONAL CDB LENGTH interpretation [SCSI] scsi_dh_alua: Add IBM Power Virtual SCSI ALUA device to dev list [SCSI] scsi_dh_alua: add netapp to dev list [SCSI] qla2xxx: Update version number to 8.03.02-k1. [SCSI] qla2xxx: EEH: Restore PCI saved state during pci slot reset. [SCSI] qla2xxx: Add firmware ETS burst support. [SCSI] qla2xxx: Correct loop-resync issues during SNS scans. [SCSI] qla2xxx: Correct use-after-free issue in terminate_rport_io callback. [SCSI] qla2xxx: Correct EH bus-reset handling. [SCSI] qla2xxx: Proper clean-up of BSG requests when request times out. [SCSI] qla2xxx: Initialize payload receive length in failure path of vendor commands [SCSI] fix duplicate removal on error path in scsi_sysfs_add_sdev [SCSI] fix refcounting bug in scsi_get_host_dev [SCSI] fix memory leak in scsi_report_lun_scan [SCSI] lpfc: correct PPC build failure [SCSI] raid_class: add raid1e [SCSI] mpt2sas: Do not call sas_is_tlr_enabled for RAID volumes. [SCSI] zfcp: Introduce header file for qdio structs and inline functions ...
2010-02-26MAINTAINERS: update mwl8k maintenance statusLennert Buytenhek
I am no longer with Marvell. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-02-26ibft: Update MAINTAINERS file.Konrad Rzeszutek Wilk
Provide the right e-mail and names for me and Peter. Signed-off-by: Konrad Rzeszutek Wilk <konrad@kernel.org>
2010-02-26V4L/DVB: MAINTAINERS: Telegent tlg2300 section fixJoe Perches
linux-next commit 2ff8223957d901999bf76aaf2c6183e33a6ad14e exposes an infinite loop defect in scripts/get_maintainer.pl Fix the incorrect format of the MAINTAINERS "M:" entries. Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Huang Shijie <shijie8@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-02-26V4L/DVB: Add driver for Telegent tlg2300Huang Shijie
pd-common.h contains the common data structures, while vendorcmds.h contains the vendor commands for firmware. [mchehab@redhat.com: Folded the 10 patches with the driver] Signed-off-by: Huang Shijie <shijie8@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-02-25Merge branch 'master' of ↵David S. Miller
git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 Conflicts: drivers/net/wireless/iwlwifi/iwl-core.h drivers/net/wireless/rt2x00/rt2800pci.c
2010-02-25Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2010-02-25MAINTAINERS: update drivers/platform/x86 informationMatthew Garrett
Many of the drivers/platform/x86 drivers have nothing to do with ACPI, so it's kind of inappropriate for them to be stuck under the ACPI mailing list. Add a new mailing list (platform-driver-x86@vger.kernel.org) and, with Len's blessing, add myself as subsystem maintainer. Signed-off-by: Matthew Garrett <mjg@redhat.com> Cc: Anisse Astier <anisse@astier.eu> Cc: Carlos Corbacho <carlos@strangeworlds.co.uk> Cc: Cezary Jackiewicz <cezary.jackiewicz@gmail.com> Cc: Corentin Chary <corentincj@iksaif.net> Cc: Daniel Oliveira Nascimento <don@syst.com.br> Cc: Harald Welte <laforge@gnumonks.org> Cc: Henrique de Moraes Holschuh <ibm-acpi@hmh.eng.br> Cc: Herton Ronaldo Krzesinski <herton@mandriva.com.br> Cc: Jonathan Woithe <jwoithe@physics.adelaide.edu.au> Cc: Karol Kozimor <sziwan@users.sourceforge.net> Cc: Len Brown <lenb@kernel.org> Cc: Lennart Poettering <mzxreary@0pointer.de> Cc: Mattia Dongili <malattia@linux.it> Cc: Peter Feuerer <peter@piie.net> Cc: Sujith Thomas <sujith.thomas@intel.com> Cc: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
2010-02-25Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linusLinus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus: (44 commits) Add MAINTAINERS entry for virtio_console virtio: console: Fill ports' entire in_vq with buffers virtio: console: Error out if we can't allocate buffers for control queue virtio: console: Add ability to remove module virtio: console: Ensure no memleaks in case of unused buffers virtio: console: show error message if hvc_alloc fails for console ports virtio: console: Add debugfs files for each port to expose debug info virtio: console: Add ability to hot-unplug ports virtio: console: Handle port hot-plug virtio: console: Remove cached data on port close virtio: console: Register with sysfs and create a 'name' attribute for ports virtio: console: Ensure only one process can have a port open at a time virtio: console: Add file operations to ports for open/read/write/poll virtio: console: Associate each port with a char device virtio: console: Prepare for writing to userspace buffers virtio: console: Add a new MULTIPORT feature, support for generic ports virtio: console: Introduce a send_buf function for a common path for sending data to host virtio: console: Introduce function to hand off data from host to readers virtio: console: Separate out find_vqs operation into a different function virtio: console: Separate out console init into a new function ...
2010-02-25Merge commit 'v2.6.33' into core/rcuIngo Molnar
Merge reason: Update from -rc4 to -final. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2010-02-24Add MAINTAINERS entry for virtio_consoleAmit Shah
I'm taking ownership of the virtio_console module; but I'll continue feeding patches via Rusty. Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2010-02-23Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: net: bug fix for vlan + gro issue tc35815: Remove a wrong netif_wake_queue() call which triggers BUG_ON cdc_ether: new PID for Ericsson C3607w to the whitelist (resubmit) IPv6: better document max_addresses parameter MAINTAINERS: update mv643xx_eth maintenance status e1000: Fix DMA mapping error handling on RX iwlwifi: sanity check before counting number of tfds can be free iwlwifi: error checking for number of tfds in queue iwlwifi: set HT flags after channel in rxon
2010-02-23MAINTAINERS: update mv643xx_eth maintenance statusLennert Buytenhek
I am no longer with Marvell. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-02-20Merge master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds
* master.kernel.org:/home/rmk/linux-2.6-arm: ARM: allow alignment fault mode to be configured at kernel boot ARM: Update mach-types ARM: 5951/1: ARM: fix documentation of the PrimeCell bus ARM: 5950/1: ARM: Fix build error for arm1026ej-s processor MAINTAINERS: fix my e-mail and status for Gemini and FA526 Gemini: wrong registers used to set reg_level in gpio_set_irq_type() ARM: 5944/1: scsi: fix timer setup in fas216.c ARM: 5938/1: ARM: L2: export outer_cache_fns
2010-02-19MAINTAINERS: Add two maintainers for be2net driverAjit Khaparde
Signed-off-by: Ajit Khaparde <ajitk@serverengines.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-02-19MAINTAINERS: update Kalle's email addressKalle Valo
My nokia.com email address won't work anymore, use my private iki.fi address instead. Signed-off-by: Kalle Valo <kalle.valo@iki.fi> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-02-18Orphan DECnetChrissie Caulfield
Due to lack of time, space, motivation, hardware and probably expertise, I have reluctantly decided to orphan the DECnet code in the kernel. Judging by the deafening silence on the linux-decnet mailing list I suspect it's either not being used anyway, or the few people that are using it are happy with their older kernels. Signed-Off-By: Christine Caulfield <christine.caulfield@googlemail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-02-18MAINTAINERS: fix my e-mail and status for Gemini and FA526Paulius Zaleckas
Signed-off-by: Paulius Zaleckas <paulius.zaleckas@gmail.com>
2010-02-18Orphan DECnetChristine Caulfield
Due to lack of time, space, motivation, hardware and probably expertise, I have reluctantly decided to orphan the DECnet code in the kernel. Judging by the deafening silence on the linux-decnet mailing list I suspect it's either not being used anyway, or the few people that are using it are happy with their older kernels. Signed-off-by: Christine Caulfield <christine.caulfield@googlemail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-02-17net: Add Aeroflex Gaisler 10/100/1G Ethernet MAC driverKristoffer Glembo
Adds device driver for Aeroflex Gaisler 10/100 and 10/100/1G Ethernet MAC IP cores. Signed-off-by: Kristoffer Glembo <kristoffer@gaisler.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-02-17[SCSI] MAINTAINERS: Adding FCoE information to the MAINTAINERS file.Robert Love
Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-02-16Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2010-02-11MAINTAINERS: changed LTP maintainership responsibilitiesRishikesh
Change the LTP maintainer responsibities from 2010. Ref: http://marc.info/?l=ltp-list&m=126502242912536&w=2 Signed-off-by : Rishikesh K Rajak <risrajak@linux.vnet.ibm.com> Cc: Subrata Modak <subrata@linux.vnet.ibm.com> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Garrett Cooper <yanegomi@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-02-09Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2010-02-08MAINTAINERS: networking drivers - Add git net-next treeJoe Perches
During the rc period, patches that are not bugfixes should be done using the net-next tree. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-28Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2010-01-23MAINTAINERS: Add Intel igbvf maintainerJeff Kirsher
Add igbvf to the list of supported Intel drivers and Alex to the list of maintainers. Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-23Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2010-01-22Merge branch 'master' of /home/davem/src/GIT/linux-2.6/David S. Miller
2010-01-17MAINTAINERS: ivtv-devel is moderatedJiri Slaby
Mark ivtv-devel@ivtvdriver.org as 'moderated for non-subscribers'. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Acked-by: Andy Walls <awalls@radix.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-01-17MAINTAINERS: Andy Walls is the new ivtv maintainerHans Verkuil
Replaces Hans Verkuil by Andy Walls as the ivtv maintainer. After 4 1/2 years, Hans decided to hand over the ivtv driver to Andy. Andy was already doing more work on ivtv than him, so this just makes official what was happening in practice. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Andy Walls <awalls@radix.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-01-16NET: Add Qlogic ethernet driver for CNA devicesAmit Kumar Salecha
o Separate Ethernet driver for Qlogic CNA devices Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-15MAINTAINERS: transfer maintainership of I/OATDan Williams
Dan Williams takes over I/OAT from Maciej Sosnowski Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-15vhost_net: a kernel-level virtio serverMichael S. Tsirkin
What it is: vhost net is a character device that can be used to reduce the number of system calls involved in virtio networking. Existing virtio net code is used in the guest without modification. There's similarity with vringfd, with some differences and reduced scope - uses eventfd for signalling - structures can be moved around in memory at any time (good for migration, bug work-arounds in userspace) - write logging is supported (good for migration) - support memory table and not just an offset (needed for kvm) common virtio related code has been put in a separate file vhost.c and can be made into a separate module if/when more backends appear. I used Rusty's lguest.c as the source for developing this part : this supplied me with witty comments I wouldn't be able to write myself. What it is not: vhost net is not a bus, and not a generic new system call. No assumptions are made on how guest performs hypercalls. Userspace hypervisors are supported as well as kvm. How it works: Basically, we connect virtio frontend (configured by userspace) to a backend. The backend could be a network device, or a tap device. Backend is also configured by userspace, including vlan/mac etc. Status: This works for me, and I haven't see any crashes. Compared to userspace, people reported improved latency (as I save up to 4 system calls per packet), as well as better bandwidth and CPU utilization. Features that I plan to look at in the future: - mergeable buffers - zero copy - scalability tuning: figure out the best threading model to use Note on RCU usage (this is also documented in vhost.h, near private_pointer which is the value protected by this variant of RCU): what is happening is that the rcu_dereference() is being used in a workqueue item. The role of rcu_read_lock() is taken on by the start of execution of the workqueue item, of rcu_read_unlock() by the end of execution of the workqueue item, and of synchronize_rcu() by flush_workqueue()/flush_work(). In the future we might need to apply some gcc attribute or sparse annotation to the function passed to INIT_WORK(). Paul's ack below is for this RCU usage. (Includes fixes by Alan Cox <alan@linux.intel.com>, David L Stevens <dlstevens@us.ibm.com>, Chris Wright <chrisw@redhat.com>) Acked-by: Rusty Russell <rusty@rustcorp.com.au> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>