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2008-04-14[NET_SCHED] sch_api: fix qdisc_tree_decrease_qlen() loopJarek Poplawski
TC_H_MAJ(parentid) for root classes is the same as for ingress, and if ingress qdisc is created qdisc_lookup() returns its pointer (without ingress NULL is returned). After this all qdisc_lookups give the same, and we get endless loop. (I don't know how this could hide for so long - it should trigger with every leaf class deleted if it's qdisc isn't empty.) After this fix qdisc_lookup() is omitted both for ingress and root parents, but looking for root is only wasting a little time here... Many thanks to Enrico Demarin for finding a test for catching this bug, which probably bothered quite a lot of admins. Reported-by: Enrico Demarin <enrico@superclick.com>, Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Acked-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28[NET_SCHED]: sch_api: introduce constant for rate table sizePatrick McHardy
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28[NET_SCHED]: Use NLA_PUT_STRING for string dumpingPatrick McHardy
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28[NET_SCHED]: Convert packet schedulers from rtnetlink to new netlink APIPatrick McHardy
Convert packet schedulers to use the netlink API. Unfortunately a gradual conversion is not possible without breaking compilation in the middle or adding lots of casts, so this patch converts them all in one step. The patch has been mostly generated automatically with some minor edits to at least allow seperate conversion of classifiers and actions. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28[NET_SCHED]: Move EXPORT_SYMBOL next to exported symbolPatrick McHardy
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28[NET]: Make rtnetlink infrastructure network namespace aware (v3)Denis V. Lunev
After this patch none of the netlink callback support anything except the initial network namespace but the rtnetlink infrastructure now handles multiple network namespaces. Changes from v2: - IPv6 addrlabel processing Changes from v1: - no need for special rtnl_unlock handling - fixed IPv6 ndisc Signed-off-by: Denis V. Lunev <den@openvz.org> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28[NET]: Modify all rtnetlink methods to only work in the initial namespace (v2)Denis V. Lunev
Before I can enable rtnetlink to work in all network namespaces I need to be certain that something won't break. So this patch deliberately disables all of the rtnletlink methods in everything except the initial network namespace. After the methods have been audited this extra check can be disabled. Changes from v1: - added IPv6 addrlabel protection Signed-off-by: Denis V. Lunev <den@openvz.org> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2008-01-28[NET]: Move Qdisc_class_ops and Qdisc_ops in appropriate sections.Eric Dumazet
Qdisc_class_ops are const, and Qdisc_ops are mostly read. Using "const" and "__read_mostly" qualifiers helps to reduce false sharing. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-10[NET_SCHED]: Show timer resolution instead of clock resolution in ↵Patrick McHardy
/proc/net/psched The fourth parameter of /proc/net/psched is supposed to show the timer resultion and is used by HTB userspace to calculate the necessary burst rate. Currently we show the clock resolution, which results in a too low burst rate when the two differ. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-10[NET]: Make the device list and device lookups per namespace.Eric W. Biederman
This patch makes most of the generic device layer network namespace safe. This patch makes dev_base_head a network namespace variable, and then it picks up a few associated variables. The functions: dev_getbyhwaddr dev_getfirsthwbytype dev_get_by_flags dev_get_by_name __dev_get_by_name dev_get_by_index __dev_get_by_index dev_ioctl dev_ethtool dev_load wireless_process_ioctl were modified to take a network namespace argument, and deal with it. vlan_ioctl_set and brioctl_set were modified so their hooks will receive a network namespace argument. So basically anthing in the core of the network stack that was affected to by the change of dev_base was modified to handle multiple network namespaces. The rest of the network stack was simply modified to explicitly use &init_net the initial network namespace. This can be fixed when those components of the network stack are modified to handle multiple network namespaces. For now the ifindex generator is left global. Fundametally ifindex numbers are per namespace, or else we will have corner case problems with migration when we get that far. At the same time there are assumptions in the network stack that the ifindex of a network device won't change. Making the ifindex number global seems a good compromise until the network stack can cope with ifindex changes when you change namespaces, and the like. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-10[NET]: Make /proc/net per network namespaceEric W. Biederman
This patch makes /proc/net per network namespace. It modifies the global variables proc_net and proc_net_stat to be per network namespace. The proc_net file helpers are modified to take a network namespace argument, and all of their callers are fixed to pass &init_net for that argument. This ensures that all of the /proc/net files are only visible and usable in the initial network namespace until the code behind them has been updated to be handle multiple network namespaces. Making /proc/net per namespace is necessary as at least some files in /proc/net depend upon the set of network devices which is per network namespace, and even more files in /proc/net have contents that are relevant to a single network namespace. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-31[NET]: Fix sch_api to properly set sch->parent on the root.Patrick McHardy
Fix sch_api to correctly set sch->parent for both ingress and egress qdiscs in qdisc_create(). Signed-off-by: Patrick McHardy <trash@kaber.net> Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-15[NET_SCHED]: act_api: qdisc internal reclassify supportPatrick McHardy
The behaviour of NET_CLS_POLICE for TC_POLICE_RECLASSIFY was to return it to the qdisc, which could handle it internally or ignore it. With NET_CLS_ACT however, tc_classify starts over at the first classifier and never returns it to the qdisc. This makes it impossible to support qdisc-internal reclassification, which in turn makes it impossible to remove the old NET_CLS_POLICE code without breaking compatibility since we have two qdiscs (CBQ and ATM) that support this. This patch adds a tc_classify_compat function that handles reclassification the old way and changes CBQ and ATM to use it. This again is of course not fully backwards compatible with the previous NET_CLS_ACT behaviour. Unfortunately there is no way to fully maintain compatibility *and* support qdisc internal reclassification with NET_CLS_ACT, but this seems like the better choice over keeping the two incompatible options around forever. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-14[NET_SCHED]: Revert "avoid transmit softirq on watchdog wakeup" optimizationPatrick McHardy
As noticed by Ranko Zivojnovic <ranko@spidernet.net>, calling qdisc_run from the timer handler can result in deadlock: > CPU#0 > > qdisc_watchdog() fires and gets dev->queue_lock > qdisc_run()...qdisc_restart()... > -> releases dev->queue_lock and enters dev_hard_start_xmit() > > CPU#1 > > tc del qdisc dev ... > qdisc_graft()...dev_graft_qdisc()...dev_deactivate()... > -> grabs dev->queue_lock ... > > qdisc_reset()...{cbq,hfsc,htb,netem,tbf}_reset()...qdisc_watchdog_cancel()... > -> hrtimer_cancel() - waiting for the qdisc_watchdog() to exit, while still > holding dev->queue_lock > > CPU#0 > > dev_hard_start_xmit() returns ... > -> wants to get dev->queue_lock(!) > > DEADLOCK! The entire optimization is a bit questionable IMO, it moves potentially large parts of NET_TX_SOFTIRQ work to TIMER_SOFTIRQ/HRTIMER_SOFTIRQ, which kind of defeats the separation of them. Signed-off-by: Patrick McHardy <kaber@trash.net> Acked-by: Ranko Zivojnovic <ranko@spidernet.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-10[NET_SCHED]: Remove unnecessary includesPatrick McHardy
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-10[NET_SCHED]: Remove CONFIG_NET_ESTIMATOR optionPatrick McHardy
The generic estimator is always built in anways and all the config options does is prevent including a minimal amount of code for setting it up. Additionally the option is already automatically selected for most cases. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-05-03[NET]: Rework dev_base via list_head (v3)Pavel Emelianov
Cleanup of dev_base list use, with the aim to simplify making device list per-namespace. In almost every occasion, use of dev_base variable and dev->next pointer could be easily replaced by for_each_netdev loop. A few most complicated places were converted to using first_netdev()/next_netdev(). Signed-off-by: Pavel Emelianov <xemul@openvz.org> Acked-by: Kirill Korotaev <dev@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25[NET_SCHED]: ingress: switch back to using ingress_lockPatrick McHardy
Switch ingress queueing back to use ingress_lock. qdisc_lock_tree now locks both the ingress and egress qdiscs on the device. All changes to data that might be used on both ingress and egress needs to be protected by using qdisc_lock_tree instead of manually taking dev->queue_lock. Additionally the qdisc stats_lock needs to be initialized to ingress_lock for ingress qdiscs. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25[NET_SCHED]: Eliminate qdisc_tree_lockPatrick McHardy
Since we're now holding the rtnl during the entire dump operation, we can remove qdisc_tree_lock, whose only purpose is to protect dump callbacks from concurrent changes to the qdisc tree. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25[NET_SCHED]: qdisc: remove unnecessary memory barriersPatrick McHardy
We're holding dev->queue_lock in qdisc_watchdog_schedule and qdisc_watchdog_cancel, no need for the barriers. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25[NET_SCHED]: Unline tcf_destroyPatrick McHardy
Uninline tcf_destroy and add a helper function to destroy an entire filter chain. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25[NET_SCHED] qdisc: avoid transmit softirq on watchdog wakeupStephen Hemminger
If possible, avoid having to do a transmit softirq when a qdisc watchdog decides to re-enable. The watchdog routine runs off a timer, so it is already in the same effective context as the softirq. Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25[NETEM]: avoid excessive requeuesStephen Hemminger
The netem code would call getnstimeofday() and dequeue/requeue after every packet, even if it was waiting. Avoid this overhead by using the throttled flag. Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25[PKT_SCHED] qdisc: Use rtnl registration interfaceThomas Graf
Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25[NETLINK]: Use nlmsg_trim() where appropriateArnaldo Carvalho de Melo
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25[SK_BUFF]: Convert skb->tail to sk_buff_data_tArnaldo Carvalho de Melo
So that it is also an offset from skb->head, reduces its size from 8 to 4 bytes on 64bit architectures, allowing us to combine the 4 bytes hole left by the layer headers conversion, reducing struct sk_buff size to 256 bytes, i.e. 4 64byte cachelines, and since the sk_buff slab cache is SLAB_HWCACHE_ALIGN... :-) Many calculations that previously required that skb->{transport,network, mac}_header be first converted to a pointer now can be done directly, being meaningful as offsets or pointers. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25[NET_SCHED]: Fix warningPatrick McHardy
net/sched/sch_api.c: In function 'psched_show': net/sched/sch_api.c:1219: warning: format '%08x' expects type 'unsigned int', but argument 6 has type 's64' Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25[NET_SCHED]: Export real timer resolution in /proc/net/pschedPatrick McHardy
The timer resolution exported in /proc/net/psched is used by userspace to calculate HTB's burst values. Currently it is set to HZ, since we're now using hrtimers, use KTIME_MONOTONIC_RES, which makes HTB use smaller burst values. This patch also affects libnl, which incorrectly uses this value for the SFQ perturbation parameter, which is always in seconds, and some routing cache values, which are in USER_HZ, so both cases are broken anyway. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25[NET_SCHED]: Add hrtimer based qdisc watchdogPatrick McHardy
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25[NET_SCHED]: Use ktime as clocksourcePatrick McHardy
Get rid of the manual clock source selection mess and use ktime. Also use a scalar representation, which allows to clean up pkt_sched.h a bit more and results in less ktime_to_ns() calls in most cases. The PSCHED_US2JIFFIE/PSCHED_JIFFIE2US macros are implemented quite inefficient by this patch, following patches will convert all qdiscs to hrtimers and get rid of them entirely. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25[NET] SCHED: Use htons() where appropriate.YOSHIFUJI Hideaki
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-02-14[PATCH] remove many unneeded #includes of sched.hTim Schmielau
After Al Viro (finally) succeeded in removing the sched.h #include in module.h recently, it makes sense again to remove other superfluous sched.h includes. There are quite a lot of files which include it but don't actually need anything defined in there. Presumably these includes were once needed for macros that used to live in sched.h, but moved to other header files in the course of cleaning it up. To ease the pain, this time I did not fiddle with any header files and only removed #includes from .c-files, which tend to cause less trouble. Compile tested against 2.6.20-rc2 and 2.6.20-rc2-mm2 (with offsets) on alpha, arm, i386, ia64, mips, powerpc, and x86_64 with allnoconfig, defconfig, allmodconfig, and allyesconfig as well as a few randconfigs on x86_64 and all configs in arch/arm/configs on arm. I also checked that no new warnings were introduced by the patch (actually, some warnings are removed that were emitted by unnecessarily included header files). Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12[PATCH] mark struct file_operations const 8Arjan van de Ven
Many struct file_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-10[NET] SCHED: Fix whitespace errors.YOSHIFUJI Hideaki
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-02[PKT_SCHED]: Remove unused exports.Adrian Bunk
This patch removes the following unused EXPORT_SYMBOL's: - sch_api.c: qdisc_lookup - sch_generic.c: __netdev_watchdog_up - sch_generic.c: noop_qdisc_ops - sch_generic.c: qdisc_alloc Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-02[NET_SCHED]: Fix endless loops caused by inaccurate qlen counters (part 1)Patrick McHardy
There are multiple problems related to qlen adjustment that can lead to an upper qdisc getting out of sync with the real number of packets queued, leading to endless dequeueing attempts by the upper layer code. All qdiscs must maintain an accurate q.qlen counter. There are basically two groups of operations affecting the qlen: operations that propagate down the tree (enqueue, dequeue, requeue, drop, reset) beginning at the root qdisc and operations only affecting a subtree or single qdisc (change, graft, delete class). Since qlen changes during operations from the second group don't propagate to ancestor qdiscs, their qlen values become desynchronized. This patch adds a function to propagate qlen changes up the qdisc tree, optionally calling a callback function to perform qdisc-internal maintenance when the child qdisc becomes empty. The follow-up patches will convert all qdiscs to use this function where necessary. Noticed by Timo Steinbach <tsteinbach@astaro.com>. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-02[NET]: net/sched annotations.Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
2006-09-28[NET_SCHED]: Fix fallout from dev->qdisc RCU changePatrick McHardy
The move of qdisc destruction to a rcu callback broke locking in the entire qdisc layer by invalidating previously valid assumptions about the context in which changes to the qdisc tree occur. The two assumptions were: - since changes only happen in process context, read_lock doesn't need bottem half protection. Now invalid since destruction of inner qdiscs, classifiers, actions and estimators happens in the RCU callback unless they're manually deleted, resulting in dead-locks when read_lock in process context is interrupted by write_lock_bh in bottem half context. - since changes only happen under the RTNL, no additional locking is necessary for data not used during packet processing (f.e. u32_list). Again, since destruction now happens in the RCU callback, this assumption is not valid anymore, causing races while using this data, which can result in corruption or use-after-free. Instead of "fixing" this by disabling bottem halfs everywhere and adding new locks/refcounting, this patch makes these assumptions valid again by moving destruction back to process context. Since only the dev->qdisc pointer is protected by RCU, but ->enqueue and the qdisc tree are still protected by dev->qdisc_lock, destruction of the tree can be performed immediately and only the final free needs to happen in the rcu callback to make sure dev_queue_xmit doesn't access already freed memory. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2006-08-04[PKT_SCHED]: Return ENOENT if qdisc module is unavailableJamal Hadi Salim
Return ENOENT if qdisc module is unavailable Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca> Signed-off-by: David S. Miller <davem@davemloft.net>
2006-06-30Remove obsolete #include <linux/config.h>Jörn Engel
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
2005-09-09[PATCH] timer initialization cleanup: DEFINE_TIMERIngo Molnar
Clean up timer initialization by introducing DEFINE_TIMER a'la DEFINE_SPINLOCK. Build and boot-tested on x86. A similar patch has been been in the -RT tree for some time. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-08-29[NETLINK]: Convert netlink users to use group numbers instead of bitmasksPatrick McHardy
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-05[PKT_SCHED]: Report rate estimator configuration errors during qdisc allocationThomas Graf
Current behaviour is to not report an error if a rate estimator is created together with a qdisc and the configuration of the rate estimator is bogus. This leads to unexpected behaviour because the user is not notified. New behaviour is to report the error and let the whole qdisc creation operation fail so the user is able to fix his mistake. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2005-07-05[PKT_SCHED]: Cleanup qdisc creation and alignment macrosThomas Graf
Adds qdisc_alloc() to share code between qdisc_create() and qdisc_create_dflt(). Hides the qdisc alignment behind macros and makes use of them. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2005-06-28[NETLINK]: Missing initializations in dumped dataPatrick McHardy
Mostly missing initialization of padding fields of 1 or 2 bytes length, two instances of uninitialized nlmsgerr->msg of 16 bytes length. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2005-06-18[NETLINK]: Explicit typingJamal Hadi Salim
This patch converts "unsigned flags" to use more explict types like u16 instead and incrementally introduces NLMSG_NEW(). Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca> Signed-off-by: David S. Miller <davem@davemloft.net>
2005-05-03[PKT_SCHED]: netetm: adjust parent qlen when duplicatingStephen Hemminger
Fix qlen underrun when doing duplication with netem. If netem is used as leaf discipline, then the parent needs to be tweaked when packets are duplicated. Signed-off-by: Stephen Hemminger <shemminger@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2005-04-16Linux-2.6.12-rc2Linus Torvalds
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!