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2012-07-22merge task_work and rcu_head, get rid of separate allocation for keyring caseAl Viro
task_work and rcu_head are identical now; merge them (calling the result struct callback_head, rcu_head #define'd to it), kill separate allocation in security/keys since we can just use cred->rcu now. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-07-22trim task_work: get rid of hlistAl Viro
layout based on Oleg's suggestion; single-linked list, task->task_works points to the last element, forward pointer from said last element points to head. I'd still prefer much more regular scheme with two pointers in task_work, but... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-07-22trimming task_work: kill ->dataAl Viro
get rid of the only user of ->data; this is _not_ the final variant - in the end we'll have task_work and rcu_head identical and just use cred->rcu, at which point the separate allocation will be gone completely. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-07-22net: netprio_cgroup: rework update socket logicJohn Fastabend
Instead of updating the sk_cgrp_prioidx struct field on every send this only updates the field when a task is moved via cgroup infrastructure. This allows sockets that may be used by a kernel worker thread to be managed. For example in the iscsi case today a user can put iscsid in a netprio cgroup and control traffic will be sent with the correct sk_cgrp_prioidx value set but as soon as data is sent the kernel worker thread isssues a send and sk_cgrp_prioidx is updated with the kernel worker threads value which is the default case. It seems more correct to only update the field when the user explicitly sets it via control group infrastructure. This allows the users to manage sockets that may be used with other threads. Signed-off-by: John Fastabend <john.r.fastabend@intel.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-22skbuff: add an api to orphan fragsMichael S. Tsirkin
Many places do if ((skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY)) skb_copy_ubufs(skb, gfp_mask); to copy and invoke frag destructors if necessary. Add an inline helper for this. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-22mmc: sd: Fix sd current limit settingAaron Lu
Host has different current capabilities at different voltages, we need to record these settings seperately. The defined voltages are 1.8/3.0/3.3. For other voltages, we do not touch current limit setting. Before we set the current limit for the sd card, find out the host's operating voltage first and then find out the current capabilities of the host at that voltage to set the current limit. Signed-off-by: Aaron Lu <aaron.lu@amd.com> Reviewed-by: Philip Rakity <prakity@marvell.com> Signed-off-by: Chris Ball <cjb@laptop.org>
2012-07-22mmc: sdhci: Introduce new flag SDHCI_USING_RETUNING_TIMERAaron Lu
Add a new flag of SDHCI_USING_RETUNING_TIMER to represent if the host is using a retuning timer for the card inserted. This flag is set when the host does tuning the first time for the card and the host's retuning mode is 1. This flag is used afterwards whenever needs to decide if the host is currently using a retuning timer. This flag is cleared when the card is removed in sdhci_reinit. The set/clear of the flag and the start/stop of the retuning timer is associated with the card's init/remove time, so there is no need to touch it when the host is to be removed as at that time the card should have already been removed. Signed-off-by: Aaron Lu <aaron.lu@amd.com> Reviewed-by: Girish K S <girish.shivananjappa@linaro.org> Reviewed-by: Philip Rakity <prakity@marvell.com> Signed-off-by: Chris Ball <cjb@laptop.org>
2012-07-22mmc: sdhci: Allow caps[1] to be set via SDHCI_QUIRK_MISSING_CAPSPhilip Rakity
Currently only the capability_0 register can be set if SDHCI_QUIRK_MISSING_CAPS is defined. This is a problem when the capability_1 register also needs changing. Use the quirk SDHCI_QUIRK_MISSING_CAPS to allow both registers to be set. Redefining caps[1] is useful when the board design does not support 1.8v vccq so UHS modes are not available. The code that calls sdhci_add_host can then detect this condition and adjust the caps so the UHS mode will not be attempted on UHS cards. Signed-off-by: Philip Rakity <prakity@marvell.com> Signed-off-by: Chris Ball <cjb@laptop.org>
2012-07-22Merge branch 'x86-platform-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 platform changes from Ingo Molnar: "This tree mostly involves various APIC driver cleanups/robustization, and vSMP motivated platform callback improvements/cleanups" Fix up trivial conflict due to printk cleanup right next to return value change. * 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (29 commits) Revert "x86/early_printk: Replace obsolete simple_strtoul() usage with kstrtoint()" x86/apic/x2apic: Use multiple cluster members for the irq destination only with the explicit affinity x86/apic/x2apic: Limit the vector reservation to the user specified mask x86/apic: Optimize cpu traversal in __assign_irq_vector() using domain membership x86/vsmp: Fix vector_allocation_domain's return value irq/apic: Use config_enabled(CONFIG_SMP) checks to clean up irq_set_affinity() for UP x86/vsmp: Fix linker error when CONFIG_PROC_FS is not set x86/apic/es7000: Make apicid of a cluster (not CPU) from a cpumask x86/apic/es7000+summit: Always make valid apicid from a cpumask x86/apic/es7000+summit: Fix compile warning in cpu_mask_to_apicid() x86/apic: Fix ugly casting and branching in cpu_mask_to_apicid_and() x86/apic: Eliminate cpu_mask_to_apicid() operation x86/x2apic/cluster: Vector_allocation_domain() should return a value x86/apic/irq_remap: Silence a bogus pr_err() x86/vsmp: Ignore IOAPIC IRQ affinity if possible x86/apic: Make cpu_mask_to_apicid() operations check cpu_online_mask x86/apic: Make cpu_mask_to_apicid() operations return error code x86/apic: Avoid useless scanning thru a cpumask in assign_irq_vector() x86/apic: Try to spread IRQ vectors to different priority levels x86/apic: Factor out default vector_allocation_domain() operation ...
2012-07-22sctp: Implement quick failover draft from tsvwgNeil Horman
I've seen several attempts recently made to do quick failover of sctp transports by reducing various retransmit timers and counters. While its possible to implement a faster failover on multihomed sctp associations, its not particularly robust, in that it can lead to unneeded retransmits, as well as false connection failures due to intermittent latency on a network. Instead, lets implement the new ietf quick failover draft found here: http://tools.ietf.org/html/draft-nishida-tsvwg-sctp-failover-05 This will let the sctp stack identify transports that have had a small number of errors, and avoid using them quickly until their reliability can be re-established. I've tested this out on two virt guests connected via multiple isolated virt networks and believe its in compliance with the above draft and works well. Signed-off-by: Neil Horman <nhorman@tuxdriver.com> CC: Vlad Yasevich <vyasevich@gmail.com> CC: Sridhar Samudrala <sri@us.ibm.com> CC: "David S. Miller" <davem@davemloft.net> CC: linux-sctp@vger.kernel.org CC: joe@perches.com Acked-by: Vlad Yasevich <vyasevich@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-22Merge branch 'timers-core-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull timer core changes from Ingo Molnar: "Continued cleanups of the core time and NTP code, plus more nohz work preparing for tick-less userspace execution." * 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: time: Rework timekeeping functions to take timekeeper ptr as argument time: Move xtime_nsec adjustment underflow handling timekeeping_adjust time: Move arch_gettimeoffset() usage into timekeeping_get_ns() time: Refactor accumulation of nsecs to secs time: Condense timekeeper.xtime into xtime_sec time: Explicitly use u32 instead of int for shift values time: Whitespace cleanups per Ingo%27s requests nohz: Move next idle expiry time record into idle logic area nohz: Move ts->idle_calls incrementation into strict idle logic nohz: Rename ts->idle_tick to ts->last_tick nohz: Make nohz API agnostic against idle ticks cputime accounting nohz: Separate idle sleeping time accounting from nohz logic timers: Improve get_next_timer_interrupt() timers: Add accounting of non deferrable timers timers: Consolidate base->next_timer update timers: Create detach_if_pending() and use it
2012-07-22Merge branch 'regulator-drivers' into regulator-nextMark Brown
2012-07-22Merge branches 'regulator-core', 'regulator-dt' and 'regulator-dummy' into ↵Mark Brown
regulator-next
2012-07-22Merge branches 'regmap-core', 'regmap-irq' and 'regmap-page' into regmap-nextMark Brown
Conflicts (trivial context stuff): drivers/base/regmap/regmap.c include/linux/regmap.h
2012-07-22Merge branch 'smp-hotplug-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull smp/hotplug changes from Ingo Molnar: "Various cleanups to the SMP hotplug code - a continuing effort of Thomas et al" * 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: smpboot: Remove leftover declaration smp: Remove num_booting_cpus() smp: Remove ipi_call_lock[_irq]()/ipi_call_unlock[_irq]() POWERPC: Smp: remove call to ipi_call_lock()/ipi_call_unlock() SPARC: SMP: Remove call to ipi_call_lock_irq()/ipi_call_unlock_irq() ia64: SMP: Remove call to ipi_call_lock_irq()/ipi_call_unlock_irq() x86-smp-remove-call-to-ipi_call_lock-ipi_call_unlock tile: SMP: Remove call to ipi_call_lock()/ipi_call_unlock() S390: Smp: remove call to ipi_call_lock()/ipi_call_unlock() parisc: Smp: remove call to ipi_call_lock()/ipi_call_unlock() mn10300: SMP: Remove call to ipi_call_lock()/ipi_call_unlock() hexagon: SMP: Remove call to ipi_call_lock()/ipi_call_unlock()
2012-07-22Merge branch 'perf-core-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull perf events changes from Ingo Molnar: "- kernel side: - Intel uncore PMU support for Nehalem and Sandy Bridge CPUs, we support both the events available via the MSR and via the PCI access space. - various uprobes cleanups and restructurings - PMU driver quirks by microcode version and required x86 microcode loader cleanups/robustization - various tracing robustness updates - static keys: remove obsolete static_branch() - tooling side: - GTK browser improvements - perf report browser: support screenshots to file - more automated tests - perf kvm improvements - perf bench refinements - build environment improvements - pipe mode improvements - libtraceevent updates, we have now hopefully merged most bits with the out of tree forked code base ... and many other goodies." * 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (138 commits) tracing: Check for allocation failure in __tracing_open() perf/x86: Fix intel_perfmon_event_mapformatting jump label: Remove static_branch() tracepoint: Use static_key_false(), since static_branch() is deprecated perf/x86: Uncore filter support for SandyBridge-EP perf/x86: Detect number of instances of uncore CBox perf/x86: Fix event constraint for SandyBridge-EP C-Box perf/x86: Use 0xff as pseudo code for fixed uncore event perf/x86: Save a few bytes in 'struct x86_pmu' perf/x86: Add a microcode revision check for SNB-PEBS perf/x86: Improve debug output in check_hw_exists() perf/x86/amd: Unify AMD's generic and family 15h pmus perf/x86: Move Intel specific code to intel_pmu_init() perf/x86: Rename Intel specific macros perf/x86: Fix USER/KERNEL tagging of samples perf tools: Split event symbols arrays to hw and sw parts perf tools: Split out PE_VALUE_SYM parsing token to SW and HW tokens perf tools: Add empty rule for new line in event syntax parsing perf test: Use ARRAY_SIZE in parse events tests tools lib traceevent: Cleanup realloc use ...
2012-07-22Merge branch 'core-rcu-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull RCU changes from Ingo Molnar: "Quoting from Paul, the major features of this series are: 1. Preventing latency spikes of more than 200 microseconds for kernels built with NR_CPUS=4096, which is reportedly becoming the default for some distros. This is a first step, as it does not help with systems that actually -have- 4096 CPUs (work on this case is in progress, but is not yet ready for mainline). This category also includes improving concurrency of rcu_barrier(), placed here due to conflicts. Posted to LKML at: https://lkml.org/lkml/2012/6/22/381 Note that patches 18-22 of that series have been defered to 3.7, as they have not yet proven themselves to be mainline-ready (and yes, these are the ones intended to get rid of RCU's latency spikes for systems that actually have 4096 CPUs). 2. Updates to documentation and rcutorture fixes, the latter category including improvements to rcu_barrier() testing. Posted to LKML at http://lkml.indiana.edu/hypermail/linux/kernel/1206.1/04094.html. 3. Miscellaneous fixes posted to LKML at: https://lkml.org/lkml/2012/6/22/500 with the exception of the last commit, which was posted here: http://www.gossamer-threads.com/lists/linux/kernel/1561830 4. RCU_FAST_NO_HZ fixes and improvements. Posted to LKML at: http://lkml.indiana.edu/hypermail/linux/kernel/1206.1/00006.html http://www.gossamer-threads.com/lists/linux/kernel/1561833 The first four patches of the first series went into 3.5 to fix a regression. 5. Code-style fixes. These were posted to LKML at http://lkml.indiana.edu/hypermail/linux/kernel/1205.2/01180.html http://lkml.indiana.edu/hypermail/linux/kernel/1205.2/01181.html" * 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (48 commits) rcu: Fix broken strings in RCU's source code. rcu: Fix code-style issues involving "else" rcu: Introduce check for callback list/count mismatch rcu: Make RCU_FAST_NO_HZ respect nohz= boot parameter rcu: Fix qlen_lazy breakage rcu: Round FAST_NO_HZ lazy timeout to nearest second rcu: The rcu_needs_cpu() function is not a quiescent state rcu: Dump only the current CPU's buffers for idle-entry/exit warnings rcu: Add check for CPUs going offline with callbacks queued rcu: Disable preemption in rcu_blocking_is_gp() rcu: Prevent uninitialized string in RCU CPU stall info rcu: Fix rcu_is_cpu_idle() #ifdef in TINY_RCU rcu: Split RCU core processing out of __call_rcu() rcu: Prevent __call_rcu() from invoking RCU core on offline CPUs rcu: Make __call_rcu() handle invocation from idle rcu: Remove function versions of __kfree_rcu and __is_kfree_rcu_offset rcu: Consolidate tree/tiny __rcu_read_{,un}lock() implementations rcu: Remove return value from rcu_assign_pointer() key: Remove extraneous parentheses from rcu_assign_keypointer() rcu: Remove return value from RCU_INIT_POINTER() ...
2012-07-22Merge branch 'core-iommu-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull core/iommu changes from Ingo Molnar. * 'core-iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: iommu/dmar: Use pr_format() instead of PREFIX to tidy up pr_*() calls iommu/dmar: Reserve mmio space used by the IOMMU, if the BIOS forgets to iommu/dmar: Replace printks with appropriate pr_*()
2012-07-22kthread_worker: reimplement flush_kthread_work() to allow freeing the work ↵Tejun Heo
item being executed kthread_worker provides minimalistic workqueue-like interface for users which need a dedicated worker thread (e.g. for realtime priority). It has basic queue, flush_work, flush_worker operations which mostly match the workqueue counterparts; however, due to the way flush_work() is implemented, it has a noticeable difference of not allowing work items to be freed while being executed. While the current users of kthread_worker are okay with the current behavior, the restriction does impede some valid use cases. Also, removing this difference isn't difficult and actually makes the code easier to understand. This patch reimplements flush_kthread_work() such that it uses a flush_work item instead of queue/done sequence numbers. Signed-off-by: Tejun Heo <tj@kernel.org>
2012-07-21Merge tag 'v3.5-rc7' into next/boardsArnd Bergmann
Linux 3.5-rc7 Prerequisite for samsung/board3 branch. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2012-07-21Remove SYSTEM_SUSPEND_DISK system stateRafael J. Wysocki
The SYSTEM_SUSPEND_DISK system state is never used, so drop it. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-07-21Merge branch 'anton-kgdb' (kgdb dmesg fixups)Linus Torvalds
Merge emailed kgdb dmesg fixups patches from Anton Vorontsov: "The dmesg command appears to be broken after the printk rework. The old logic in the kdb code makes no sense in terms of current printk/logging storage format, and KDB simply hangs forever upon entering 'dmesg' command. The first patch revives the command by switching to kmsg_dumper iterator. As a side-effect, the code is now much more simpler. A few changes were needed in the printk.c: we needed unlocked variant of the kmsg_dumper iterator, but these can surely wait for 3.6. It's probably too late even for the first patch to go to 3.5, but I'll try to convince otherwise. :-) Here we go: - The current code is broken for sure, and has no hope to work at all. It is a regression - The new code works for me, and probably works for everyone else; - If it compiles (and I urge everyone to compile-test it on your setup), it hardly can make things worse." * Merge emailed patches from Anton Vorontsov: (4 commits) kdb: Switch to nolock variants of kmsg_dump functions printk: Implement some unlocked kmsg_dump functions printk: Remove kdb_syslog_data kdb: Revive dmesg command
2012-07-21printk: Implement some unlocked kmsg_dump functionsAnton Vorontsov
If used from KDB, the locked variants are prone to deadlocks (suppose we got to the debugger w/ the logbuf lock held). So, we have to implement a few routines that grab no logbuf lock. Yet we don't need these functions in modules, so we don't export them. Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-07-21mmc: sdhci: only set 200mA support for 1.8v if 200mA is availablePhilip Rakity
max_current_caps can return 0 if not available from the sd controller. If no regulator is present or the regulator specifies a current less then 200ma, we no longer still set the 200mA caps bit anyway. Signed-off-by: Philip Rakity <prakity@marvell.com> Reviewed-by: Aaron Lu <aaron_lu@amd.com> Signed-off-by: Chris Ball <cjb@laptop.org>
2012-07-21mmc: sh_mmcif: support generic card-detectionGuennadi Liakhovetski
Extend the sh_mmcif driver to support GPIO card detection, provided by the slot function module. The original .get_cd() platform callback is also preserved for now. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2012-07-21mmc: sh_mobile_sdhi: support caps2 flagsGuennadi Liakhovetski
Let SDHI platforms specify mmc_host::caps2 flags in their platform data. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2012-07-21mmc: tmio: support caps2 flagsGuennadi Liakhovetski
Allow tmio mmc glue drivers to pass mmc_host::caps2 flags down to the mmc layer. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2012-07-21mmc: core: add WP pin handler to slot functionsGuennadi Liakhovetski
Card Write-Protect pin is often implemented, using a GPIO, which makes it simple to provide a generic handler for it. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2012-07-21mmc: core: convert slot functions to managed allocationGuennadi Liakhovetski
This prepares for the addition of further slot functions. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2012-07-21mmc: add CD GPIO polling support to slot functionsGuennadi Liakhovetski
A simple extension of mmc slot functions add support for CD GPIO polling for cases where the GPIO cannot produce interrupts, or where this is not desired for some reason. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2012-07-21mmc: add two capability flags for CD and WP signal polarityGuennadi Liakhovetski
To handle CD and WP SD/MMC slot pins we need generic flags to specify their polarity. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2012-07-21mmc: core: use a more generic name for slot function types and fieldsGuennadi Liakhovetski
struct mmc_host::hotplug is becoming a generic hook for slot functions. Rename it accordingly. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2012-07-21mmc: tmio: add callbacks to enable-update and disable the interface clockGuennadi Liakhovetski
Every time the clock is enabled after possibly being disabled, we have to re-read its frequency and update our configuration. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Chris Ball <cjb@laptop.org>
2012-07-21mmc: add a function to get regulators, supplying card's powerGuennadi Liakhovetski
Add a function to get regulators, supplying card's Vdd and Vccq on a specific host. If a Vdd supplying regulator is found, the function checks, whether a valid OCR mask can be obtained from it. The Vccq regulator is optional. A failure to get it is not fatal. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Reviwed-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2012-07-20ipv4: Fix neigh lookup keying over loopback/point-to-point devices.David S. Miller
We were using a special key "0" for all loopback and point-to-point device neigh lookups under ipv4, but we wouldn't use that special key for the neigh creation. So basically we'd make a new neigh at each and every lookup :-) This special case to use only one neigh for these device types is of dubious value, so just remove it entirely. Reported-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-20ipv4: Kill rt->fiDavid S. Miller
It's not really needed. We only grabbed a reference to the fib_info for the sake of fib_info local metrics. However, fib_info objects are freed using RCU, as are therefore their private metrics (if any). We would have triggered a route cache flush if we eliminated a reference to a fib_info object in the routing tables. Therefore, any existing cached routes will first check and see that they have been invalidated before an errant reference to these metric values would occur. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-20ipv4: Turn rt->rt_route_iif into rt->rt_is_input.David S. Miller
That is this value's only use, as a boolean to indicate whether a route is an input route or not. So implement it that way, using a u16 gap present in the struct already. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-20ipv4: Kill rt->rt_oifDavid S. Miller
Never actually used. It was being set on output routes to the original OIF specified in the flow key used for the lookup. Adjust the only user, ipmr_rt_fib_lookup(), for greater correctness of the flowi4_oif and flowi4_iif values, thanks to feedback from Julian Anastasov. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-20ipv4: Kill FLOWI_FLAG_RT_NOCACHE and associated code.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-20ipv4: Cache input routes in fib_info nexthops.David S. Miller
Caching input routes is slightly simpler than output routes, since we don't need to be concerned with nexthop exceptions. (locally destined, and routed packets, never trigger PMTU events or redirects that will be processed by us). However, we have to elide caching for the DIRECTSRC and non-zero itag cases. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-20ipv4: Cache output routes in fib_info nexthops.David S. Miller
If we have an output route that lacks nexthop exceptions, we can cache it in the FIB info nexthop. Such routes will have DST_HOST cleared because such routes refer to a family of destinations, rather than just one. The sequence of the handling of exceptions during route lookup is adjusted to make the logic work properly. Before we allocate the route, we lookup the exception. Then we know if we will cache this route or not, and therefore whether DST_HOST should be set on the allocated route. Then we use DST_HOST to key off whether we should store the resulting route, during rt_set_nexthop(), in the FIB nexthop cache. With help from Eric Dumazet. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-20ipv4: Kill routes during PMTU/redirect updates.David S. Miller
Mark them obsolete so there will be a re-lookup to fetch the FIB nexthop exception info. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-20net: Document dst->obsolete better.David S. Miller
Add a big comment explaining how the field works, and use defines instead of magic constants for the values assigned to it. Suggested by Joe Perches. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-20ipv4: Adjust semantics of rt->rt_gateway.David S. Miller
In order to allow prefixed routes, we have to adjust how rt_gateway is set and interpreted. The new interpretation is: 1) rt_gateway == 0, destination is on-link, nexthop is iph->daddr 2) rt_gateway != 0, destination requires a nexthop gateway Abstract the fetching of the proper nexthop value using a new inline helper, rt_nexthop(), as suggested by Joe Perches. Signed-off-by: David S. Miller <davem@davemloft.net> Tested-by: Vijay Subramanian <subramanian.vijay@gmail.com>
2012-07-20ipv4: Remove 'rt_dst' from 'struct rtable'David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-20ipv4: Remove 'rt_mark' from 'struct rtable'David Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-20ipv4: Kill 'rt_src' from 'struct rtable'David Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-20ipv4: Remove rt_key_{src,dst,tos} from struct rtable.David Miller
They are always used in contexts where they can be reconstituted, or where the finally resolved rt->rt_{src,dst} is semantically equivalent. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-20ipv4: Kill ip_route_input_noref().David Miller
The "noref" argument to ip_route_input_common() is now always ignored because we do not cache routes, and in that case we must always grab a reference to the resulting 'dst'. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-20ipv4: Delete routing cache.David S. Miller
The ipv4 routing cache is non-deterministic, performance wise, and is subject to reasonably easy to launch denial of service attacks. The routing cache works great for well behaved traffic, and the world was a much friendlier place when the tradeoffs that led to the routing cache's design were considered. What it boils down to is that the performance of the routing cache is a product of the traffic patterns seen by a system rather than being a product of the contents of the routing tables. The former of which is controllable by external entitites. Even for "well behaved" legitimate traffic, high volume sites can see hit rates in the routing cache of only ~%10. Signed-off-by: David S. Miller <davem@davemloft.net>