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2008-08-07pkt_sched: Fix actions referencingJamal Hadi Salim
When an action is added several times with the same exact index it gets deleted on every even-numbered attempt. This fixes that issue. Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-08-07pkt_sched: Fix qdisc config when link is down.David S. Miller
Bug reported by Stephen Hemminger. We need to fetch the root from ->qdisc_sleeping not ->qdisc. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-08-06pkt_sched: Fix "parent is root" test in qdisc_create().David S. Miller
As noticed by Stephen Hemminger, the root qdisc is denoted by TC_H_ROOT, not zero. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-08-04net_sched: Add qdisc __NET_XMIT_BYPASS flagJarek Poplawski
Patrick McHardy <kaber@trash.net> noticed that it would be nice to handle NET_XMIT_BYPASS by NET_XMIT_SUCCESS with an internal qdisc flag __NET_XMIT_BYPASS and to remove the mapping from dev_queue_xmit(). David Miller <davem@davemloft.net> spotted a serious bug in the first version of this patch. Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-08-04net_sched: Add qdisc __NET_XMIT_STOLEN flagJarek Poplawski
Patrick McHardy <kaber@trash.net> noticed: "The other problem that affects all qdiscs supporting actions is TC_ACT_QUEUED/TC_ACT_STOLEN getting mapped to NET_XMIT_SUCCESS even though the packet is not queued, corrupting upper qdiscs' qlen counters." and later explained: "The reason why it translates it at all seems to be to not increase the drops counter. Within a single qdisc this could be avoided by other means easily, upper qdiscs would still increase the counter when we return anything besides NET_XMIT_SUCCESS though. This means we need a new NET_XMIT return value to indicate this to the upper qdiscs. So I'd suggest to introduce NET_XMIT_STOLEN, return that to upper qdiscs and translate it to NET_XMIT_SUCCESS in dev_queue_xmit, similar to NET_XMIT_BYPASS." David Miller <davem@davemloft.net> noticed: "Maybe these NET_XMIT_* values being passed around should be a set of bits. They could be composed of base meanings, combined with specific attributes. So you could say "NET_XMIT_DROP | __NET_XMIT_NO_DROP_COUNT" The attributes get masked out by the top-level ->enqueue() caller, such that the base meanings are the only thing that make their way up into the stack. If it's only about communication within the qdisc tree, let's simply code it that way." This patch is trying to realize these ideas. Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-08-02pkt_sched: Use qdisc_lock() on already sampled root qdisc.David S. Miller
Based upon a bug report by Jeff Kirsher. Don't use qdisc_root_lock() in these cases as the root qdisc could have been changed, and we'd thus lock the wrong object. Tested by Emil S Tantilov who confirms that this seems to fix the problem. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-31netdev: Fix lockdep warnings in multiqueue configurations.David S. Miller
When support for multiple TX queues were added, the netif_tx_lock() routines we converted to iterate over all TX queues and grab each queue's spinlock. This causes heartburn for lockdep and it's not a healthy thing to do with lots of TX queues anyways. So modify this to use a top-level lock and a "frozen" state for the individual TX queues. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-30pkt_sched: Fix OOPS on ingress qdisc add.David S. Miller
Bug report from Steven Jan Springl: Issuing the following command causes a kernel oops: tc qdisc add dev eth0 handle ffff: ingress The problem mostly stems from all of the special case handling of ingress qdiscs. So, to fix this, do the grafting operation the same way we do for TX qdiscs. Which means that dev_activate() and dev_deactivate() now do the "qdisc_sleeping <--> qdisc" transitions on dev->rx_queue too. Future simplifications are possible now, mainly because it is impossible for dev_queue->{qdisc,qdisc_sleeping} to be NULL. There are NULL checks all over to handle the ingress qdisc special case that used to exist before this commit. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-26Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (39 commits) [PATCH] fix RLIM_NOFILE handling [PATCH] get rid of corner case in dup3() entirely [PATCH] remove remaining namei_{32,64}.h crap [PATCH] get rid of indirect users of namei.h [PATCH] get rid of __user_path_lookup_open [PATCH] f_count may wrap around [PATCH] dup3 fix [PATCH] don't pass nameidata to __ncp_lookup_validate() [PATCH] don't pass nameidata to gfs2_lookupi() [PATCH] new (local) helper: user_path_parent() [PATCH] sanitize __user_walk_fd() et.al. [PATCH] preparation to __user_walk_fd cleanup [PATCH] kill nameidata passing to permission(), rename to inode_permission() [PATCH] take noexec checks to very few callers that care Re: [PATCH 3/6] vfs: open_exec cleanup [patch 4/4] vfs: immutable inode checking cleanup [patch 3/4] fat: dont call notify_change [patch 2/4] vfs: utimes cleanup [patch 1/4] vfs: utimes: move owner check into inode_change_ok() [PATCH] vfs: use kstrdup() and check failing allocation ...
2008-07-26[PATCH] f_count may wrap aroundAl Viro
make it atomic_long_t; while we are at it, get rid of useless checks in affs, hfs and hpfs - ->open() always has it equal to 1, ->release() - to 0. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26Revert "pkt_sched: sch_sfq: dump a real number of flows"David S. Miller
This reverts commit f867e6af94239a04ec23aeec2fcda5aa58e41db7. Based upon discussions between Jarek and Patrick McHardy this is field being set is more a config parameter than a statistic. And we should add a true statistic to provide this information if we really want it. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-25net: convert BUG_TRAP to generic WARN_ONIlpo Järvinen
Removes legacy reinvent-the-wheel type thing. The generic machinery integrates much better to automated debugging aids such as kerneloops.org (and others), and is unambiguous due to better naming. Non-intuively BUG_TRAP() is actually equal to WARN_ON() rather than BUG_ON() though some might actually be promoted to BUG_ON() but I left that to future. I could make at least one BUILD_BUG_ON conversion. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-25pkt_sched: Fix locking in shutdown_scheduler_queue()David S. Miller
Qdisc locks need to be held with BH disabled. Tested-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-23pkt_sched: sch_sfq: dump a real number of flowsJarek Poplawski
Dump the "flows" number according to the number of active flows instead of repeating the "limit". Reported-by: Denys Fedoryshchenko <denys@visp.net.lb> Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-22pkt_sched: make qdisc_class_hash_alloc() staticAdrian Bunk
This patch makes the needlessly global qdisc_class_hash_alloc() static. Signed-off-by: Adrian Bunk <bunk@kernel.org> Acked-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-21net: Print the module name as part of the watchdog messageArjan van de Ven
As suggested by Dave: This patch adds a function to get the driver name from a struct net_device, and consequently uses this in the watchdog timeout handler to print as part of the message. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-21Revert "pkt_sched: Make default qdisc nonshared-multiqueue safe."David S. Miller
This reverts commit a0c80b80e0fb48129e4e9d6a9ede914f9ff1850d. After discussions with Jamal and Herbert on netdev, we should provide at least minimal prioritization at the qdisc level even in multiqueue situations. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-21pkt_sched: Remove unused variable skb in dev_deactivate_queue function.Daniel Lezcano
Removed unused variable 'skb' in the dev_deactivate_queue function Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-20pkt_sched: Fix build with NET_SCHED disabled.David S. Miller
The stab bits can't be referenced uniless the full packet scheduler layer is enabled. Reported by Stephen Rothwell. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-20net_sched: Add size table for qdiscsJussi Kivilinna
Add size table functions for qdiscs and calculate packet size in qdisc_enqueue(). Based on patch by Patrick McHardy http://marc.info/?l=linux-netdev&m=115201979221729&w=2 Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-20net_sched: Add accessor function for packet length for qdiscsJussi Kivilinna
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-20net_sched: Add qdisc_enqueue wrapperJussi Kivilinna
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-18pkt_sched: Fix noqueue_qdisc initialization.David S. Miller
Like noop_qdisc, it needs a dummy backpointer and explicit qdisc->q.lock initialization. Based upon a report by Stephen Hemminger. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-18pkt_sched: Manage qdisc list inside of root qdisc.David S. Miller
Idea is from Patrick McHardy. Instead of managing the list of qdiscs on the device level, manage it in the root qdisc of a netdev_queue. This solves all kinds of visibility issues during qdisc destruction. The way to iterate over all qdiscs of a netdev_queue is to visit the netdev_queue->qdisc, and then traverse it's list. The only special case is to ignore builting qdiscs at the root when dumping or doing a qdisc_lookup(). That was not needed previously because builtin qdiscs were not added to the device's qdisc_list. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-18pkt_sched: Get rid of u32_list.David S. Miller
The u32_list is just an indirect way of maintaining a reference to a U32 node on a per-qdisc basis. Just add an explicit node pointer for u32 to struct Qdisc an do away with this global list. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17pkt_sched: Make default qdisc nonshared-multiqueue safe.David S. Miller
Instead of 'pfifo_fast' we have just plain 'fifo_fast'. No priority queues, just a straight FIFO. This is necessary in order to legally have a seperate qdisc per queue in multi-TX-queue setups, and thus get full parallelization. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17pkt_sched: Add multiqueue handling to qdisc_graft().David S. Miller
Move the destruction of the old queue into qdisc_graft(). When operating on a root qdisc (ie. "parent == NULL"), apply the operation to all queues. The caller has grabbed a single implicit reference for this graft, therefore when we apply the change to more than one queue we must grab additional qdisc references. Otherwise, we are operating on a class of a specific parent qdisc, and therefore no multiqueue handling is necessary. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17pkt_sched: Kill netdev_queue lock.David S. Miller
We can simply use the qdisc->q.lock for all of the qdisc tree synchronization. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17pkt_sched: Kill qdisc_lock_tree and qdisc_unlock_tree.David S. Miller
No longer used. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17pkt_sched: Make qdisc grafting locking more specific.David S. Miller
Lock the root of the qdisc being operated upon. All explicit references to qdisc_tree_lock() are now gone. The only remaining uses are via the sch_tree_{lock,unlock}() and tcf_tree_{lock,unlock}() macros. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17netdevice: Move qdisc_list back into net_device proper.David S. Miller
And give it it's own lock. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17pkt_sched: Kill qdisc_lock_tree usage in cls_route.cDavid S. Miller
It just wants the qdisc tree to be synchronized, so grabbing qdisc_root_lock() is sufficient. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17pkt_sched: Remove qdisc_lock_tree usage in cls_api.cDavid S. Miller
It just wants the qdisc tree for the filter to be synchronized. So just BH lock qdisc_root_lock(q) instead. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17pkt_sched: Use per-queue locking in shutdown_scheduler_queue.David S. Miller
This eliminates another qdisc_lock_tree user. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17pkt_sched: Perform bulk of qdisc destruction in RCU.David S. Miller
This allows less strict control of access to the qdisc attached to a netdev_queue. It is even allowed to enqueue into a qdisc which is in the process of being destroyed. The RCU handler will toss out those packets. We will need this to handle sharing of a qdisc amongst multiple TX queues. In such a setup the lock has to be shared, so will be inside of the qdisc itself. At which point the netdev_queue lock cannot be used to hard synchronize access to the ->qdisc pointer. One operation we have to keep inside of qdisc_destroy() is the list deletion. It is the only piece of state visible after the RCU quiesce period, so we have to undo it early and under the appropriate locking. The operations in the RCU handler do not need any looking because the qdisc tree is no longer visible to anything at that point. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17pkt_sched: dev_init_scheduler() does not need to lock qdisc tree.David S. Miller
We are registering the device, there is no way anyone can get at this object's qdiscs yet in any meaningful way. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17pkt_sched: Schedule qdiscs instead of netdev_queue.David S. Miller
When we have shared qdiscs, packets come out of the qdiscs for multiple transmit queues. Therefore it doesn't make any sense to schedule the transmit queue when logically we cannot know ahead of time the TX queue of the SKB that the qdisc->dequeue() will give us. Just for sanity I added a BUG check to make sure we never get into a state where the noop_qdisc is scheduled. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17pkt_sched: Add and use qdisc_root() and qdisc_root_lock().David S. Miller
When code wants to lock the qdisc tree state, the logic operation it's doing is locking the top-level qdisc that sits of the root of the netdev_queue. Add qdisc_root_lock() to represent this and convert the easiest cases. In order for this to work out in all cases, we have to hook up the noop_qdisc to a dummy netdev_queue. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17pkt_sched: Make QDISC_RUNNING a qdisc state.David S. Miller
Currently it is associated with a netdev_queue, but when we have qdisc sharing that no longer makes any sense. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17pkt_sched: Move gso_skb into Qdisc.David S. Miller
We liberate any dangling gso_skb during qdisc destruction. It really only matters for the root qdisc. But when qdiscs can be shared by multiple netdev_queue objects, we can't have the gso_skb in the netdev_queue any more. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17net: Use queue aware tests throughout.David S. Miller
This effectively "flips the switch" by making the core networking and multiqueue-aware drivers use the new TX multiqueue structures. Non-multiqueue drivers need no changes. The interfaces they use such as netif_stop_queue() degenerate into an operation on TX queue zero. So everything "just works" for them. Code that really wants to do "X" to all TX queues now invokes a routine that does so, such as netif_tx_wake_all_queues(), netif_tx_stop_all_queues(), etc. pktgen and netpoll required a little bit more surgery than the others. In particular the pktgen changes, whilst functional, could be largely improved. The initial check in pktgen_xmit() will sometimes check the wrong queue, which is mostly harmless. The thing to do is probably to invoke fill_packet() earlier. The bulk of the netpoll changes is to make the code operate solely on the TX queue indicated by by the SKB queue mapping. Setting of the SKB queue mapping is entirely confined inside of net/core/dev.c:dev_pick_tx(). If we end up needing any kind of special semantics (drops, for example) it will be implemented here. Finally, we now have a "real_num_tx_queues" which is where the driver indicates how many TX queues are actually active. With IGB changes from Jeff Kirsher. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17pkt_sched: Remove RR scheduler.David S. Miller
This actually fixes a bug added by the RR scheduler changes. The ->bands and ->prio2band parameters were being set outside of the sch_tree_lock() and thus could result in strange behavior and inconsistencies. It might be possible, in the new design (where there will be one qdisc per device TX queue) to allow similar functionality via a TX hash algorithm for RR but I really see no reason to export this aspect of how these multiqueue cards actually implement the scheduling of the the individual DMA TX rings and the single physical MAC/PHY port. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-17netdev: Allocate multiple queues for TX.David S. Miller
alloc_netdev_mq() now allocates an array of netdev_queue structures for TX, based upon the queue_count argument. Furthermore, all accesses to the TX queues are now vectored through the netdev_get_tx_queue() and netdev_for_each_tx_queue() interfaces. This makes it easy to grep the tree for all things that want to get to a TX queue of a net device. Problem spots which are not really multiqueue aware yet, and only work with one queue, can easily be spotted by grepping for all netdev_get_tx_queue() calls that pass in a zero index. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-14net-sched: cls_flow: add perturbation supportPatrick McHardy
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-08netdev: Move atomic queue state bits into netdev_queue.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-08netdev: Move _xmit_lock and xmit_lock_owner into netdev_queue.David S. Miller
Accesses are mostly structured such that when there are multiple TX queues the code transformations will be a little bit simpler. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-08pkt_sched: Make qdisc_run take a netdev_queue.David S. Miller
This allows us to use this calling convention all the way down into qdisc_restart(). Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-08netdev: Make netif_schedule() routines work with netdev_queue objects.David S. Miller
Only plain netif_schedule() remains taking a net_device, mostly as a compatability item while we transition the rest of these interfaces. Everything else calls netif_schedule_queue() or __netif_schedule(), both of which take a netdev_queue pointer. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-08netdev: Move gso_skb into netdev_queue.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-08pkt_sched: Make netem queue agnostic.David S. Miller
It just wants the root qdisc given an arbitrary qdisc, and that is simply qdisc->dev_queue->qdisc Signed-off-by: David S. Miller <davem@davemloft.net> Acked-by: Stephen Hemminger <shemminger@vyatta.com>