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* treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152Thomas Gleixner2019-05-301-6/+1
| | | | | | | | | | | | | | | | | | | | | Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* netlink: make validation more configurable for future strictnessJohannes Berg2019-04-271-7/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We currently have two levels of strict validation: 1) liberal (default) - undefined (type >= max) & NLA_UNSPEC attributes accepted - attribute length >= expected accepted - garbage at end of message accepted 2) strict (opt-in) - NLA_UNSPEC attributes accepted - attribute length >= expected accepted Split out parsing strictness into four different options: * TRAILING - check that there's no trailing data after parsing attributes (in message or nested) * MAXTYPE - reject attrs > max known type * UNSPEC - reject attributes with NLA_UNSPEC policy entries * STRICT_ATTRS - strictly validate attribute size The default for future things should be *everything*. The current *_strict() is a combination of TRAILING and MAXTYPE, and is renamed to _deprecated_strict(). The current regular parsing has none of this, and is renamed to *_parse_deprecated(). Additionally it allows us to selectively set one of the new flags even on old policies. Notably, the UNSPEC flag could be useful in this case, since it can be arranged (by filling in the policy) to not be an incompatible userspace ABI change, but would then going forward prevent forgetting attribute entries. Similar can apply to the POLICY flag. We end up with the following renames: * nla_parse -> nla_parse_deprecated * nla_parse_strict -> nla_parse_deprecated_strict * nlmsg_parse -> nlmsg_parse_deprecated * nlmsg_parse_strict -> nlmsg_parse_deprecated_strict * nla_parse_nested -> nla_parse_nested_deprecated * nla_validate_nested -> nla_validate_nested_deprecated Using spatch, of course: @@ expression TB, MAX, HEAD, LEN, POL, EXT; @@ -nla_parse(TB, MAX, HEAD, LEN, POL, EXT) +nla_parse_deprecated(TB, MAX, HEAD, LEN, POL, EXT) @@ expression NLH, HDRLEN, TB, MAX, POL, EXT; @@ -nlmsg_parse(NLH, HDRLEN, TB, MAX, POL, EXT) +nlmsg_parse_deprecated(NLH, HDRLEN, TB, MAX, POL, EXT) @@ expression NLH, HDRLEN, TB, MAX, POL, EXT; @@ -nlmsg_parse_strict(NLH, HDRLEN, TB, MAX, POL, EXT) +nlmsg_parse_deprecated_strict(NLH, HDRLEN, TB, MAX, POL, EXT) @@ expression TB, MAX, NLA, POL, EXT; @@ -nla_parse_nested(TB, MAX, NLA, POL, EXT) +nla_parse_nested_deprecated(TB, MAX, NLA, POL, EXT) @@ expression START, MAX, POL, EXT; @@ -nla_validate_nested(START, MAX, POL, EXT) +nla_validate_nested_deprecated(START, MAX, POL, EXT) @@ expression NLH, HDRLEN, MAX, POL, EXT; @@ -nlmsg_validate(NLH, HDRLEN, MAX, POL, EXT) +nlmsg_validate_deprecated(NLH, HDRLEN, MAX, POL, EXT) For this patch, don't actually add the strict, non-renamed versions yet so that it breaks compile if I get it wrong. Also, while at it, make nla_validate and nla_parse go down to a common __nla_validate_parse() function to avoid code duplication. Ultimately, this allows us to have very strict validation for every new caller of nla_parse()/nlmsg_parse() etc as re-introduced in the next patch, while existing things will continue to work as is. In effect then, this adds fully strict validation for any new command. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* netlink: make nla_nest_start() add NLA_F_NESTED flagMichal Kubecek2019-04-271-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Even if the NLA_F_NESTED flag was introduced more than 11 years ago, most netlink based interfaces (including recently added ones) are still not setting it in kernel generated messages. Without the flag, message parsers not aware of attribute semantics (e.g. wireshark dissector or libmnl's mnl_nlmsg_fprintf()) cannot recognize nested attributes and won't display the structure of their contents. Unfortunately we cannot just add the flag everywhere as there may be userspace applications which check nlattr::nla_type directly rather than through a helper masking out the flags. Therefore the patch renames nla_nest_start() to nla_nest_start_noflag() and introduces nla_nest_start() as a wrapper adding NLA_F_NESTED. The calls which add NLA_F_NESTED manually are rewritten to use nla_nest_start(). Except for changes in include/net/netlink.h, the patch was generated using this semantic patch: @@ expression E1, E2; @@ -nla_nest_start(E1, E2) +nla_nest_start_noflag(E1, E2) @@ expression E1, E2; @@ -nla_nest_start_noflag(E1, E2 | NLA_F_NESTED) +nla_nest_start(E1, E2) Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Acked-by: Jiri Pirko <jiri@mellanox.com> Acked-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: sched: gred: support reporting stats from offloadsJakub Kicinski2018-11-191-0/+47
| | | | | | | | | | | Allow drivers which offload GRED to report back statistics. Since A lot of GRED stats is fairly ad hoc in nature pass to drivers the standard struct gnet_stats_basic/gnet_stats_queue pairs, and untangle the values in the core. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: John Hurley <john.hurley@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: sched: gred: add basic Qdisc offloadJakub Kicinski2018-11-191-0/+47
| | | | | | | | | Add basic offload for the GRED Qdisc. Inform the drivers any time Qdisc or virtual queue configuration changes. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: John Hurley <john.hurley@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: sched: gred: allow manipulating per-DP RED flagsJakub Kicinski2018-11-161-1/+143
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Allow users to set and dump RED flags (ECN enabled and harddrop) on per-virtual queue basis. Validation of attributes is split from changes to make sure we won't have to undo previous operations when we find out configuration is invalid. The objective is to allow changing per-Qdisc parameters without overwriting the per-vq configured flags. Old user space will not pass the TCA_GRED_VQ_FLAGS attribute and per-Qdisc flags will always get propagated to the virtual queues. New user space which wants to make use of per-vq flags should set per-Qdisc flags to 0 and then configure per-vq flags as it sees fit. Once per-vq flags are set per-Qdisc flags can't be changed to non-zero. Vice versa - if the per-Qdisc flags are non-zero the TCA_GRED_VQ_FLAGS attribute has to either be omitted or set to the same value as per-Qdisc flags. Update per-Qdisc parameters: per-Qdisc | per-VQ | result 0 | 0 | all vq flags updated 0 | non-0 | error (vq flags in use) non-0 | 0 | -- impossible -- non-0 | non-0 | all vq flags updated Update per-VQ state (flags parameter not specified): no change to flags Update per-VQ state (flags parameter set): per-Qdisc | per-VQ | result 0 | any | per-vq flags updated non-0 | 0 | -- impossible -- non-0 | non-0 | error (per-Qdisc flags in use) Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: John Hurley <john.hurley@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: sched: gred: store red flags per virtual queueJakub Kicinski2018-11-161-6/+18
| | | | | | | | | | | | Right now ECN marking and HARD drop (the common RED flags) can only be configured for the entire Qdisc. In preparation for per-vq flags store the values in the virtual queue structure. Setting per-vq flags will only be allowed when no flags are set for the entire Qdisc. For the new flags we will also make sure undefined bits are 0. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: John Hurley <john.hurley@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: sched: gred: provide a better structured dump and expose statsJakub Kicinski2018-11-161-1/+52
| | | | | | | | | | | | Currently all GRED's virtual queue data is dumped in a single array in a single attribute. This makes it pretty much impossible to add new fields. In order to expose more detailed stats add a new set of attributes. We can now expose the 64 bit value of bytesin and all the mark stats which were not part of the original design. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: John Hurley <john.hurley@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: sched: gred: store bytesin as a 64 bit valueJakub Kicinski2018-11-161-1/+1
| | | | | | | | | | | 32 bit counters for bytes are not really going to last long in modern world. Make sch_gred count bytes on a 64 bit counter. It will still get truncated during dump but follow up patch will add set of new stat dump attributes. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: John Hurley <john.hurley@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: sched: gred: use extack to provide more details on configuration errorsJakub Kicinski2018-11-161-11/+33
| | | | | | | | | Add extack messages to -EINVAL errors, to help users identify their mistakes. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: John Hurley <john.hurley@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: sched: gred: pass extack to nla_parse_nested()Jakub Kicinski2018-11-161-2/+2
| | | | | | | | | In case netlink wants to provide parsing error pass extack to nla_parse_nested(). Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: John Hurley <john.hurley@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: sched: gred: separate error and non-error path in gred_change()Jakub Kicinski2018-11-161-6/+6
| | | | | | | | | We will soon want to add more code to the non-error path, separate it from the error handling flow. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: John Hurley <john.hurley@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: sched: gred: pass the right attribute to gred_change_table_def()Jakub Kicinski2018-10-281-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | gred_change_table_def() takes a pointer to TCA_GRED_DPS attribute, and expects it will be able to interpret its contents as struct tc_gred_sopt. Pass the correct gred attribute, instead of TCA_OPTIONS. This bug meant the table definition could never be changed after Qdisc was initialized (unless whatever TCA_OPTIONS contained both passed netlink validation and was a valid struct tc_gred_sopt...). Old behaviour: $ ip link add type dummy $ tc qdisc replace dev dummy0 parent root handle 7: \ gred setup vqs 4 default 0 $ tc qdisc replace dev dummy0 parent root handle 7: \ gred setup vqs 4 default 0 RTNETLINK answers: Invalid argument Now: $ ip link add type dummy $ tc qdisc replace dev dummy0 parent root handle 7: \ gred setup vqs 4 default 0 $ tc qdisc replace dev dummy0 parent root handle 7: \ gred setup vqs 4 default 0 $ tc qdisc replace dev dummy0 parent root handle 7: \ gred setup vqs 4 default 0 Fixes: f62d6b936df5 ("[PKT_SCHED]: GRED: Use central VQ change procedure") Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: sched: sch: add extack for change qdisc opsAlexander Aring2017-12-211-1/+2
| | | | | | | | | | This patch adds extack support for change callback for qdisc ops structtur to prepare per-qdisc specific changes for extack. Cc: David Ahern <dsahern@gmail.com> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Alexander Aring <aring@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: sched: sch: add extack for init callbackAlexander Aring2017-12-211-1/+2
| | | | | | | | | | This patch adds extack support for init callback to prepare per-qdisc specific changes for extack. Cc: David Ahern <dsahern@gmail.com> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Alexander Aring <aring@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: sched: fix coding style issuesAlexander Aring2017-12-211-3/+4
| | | | | | | | | This patch fix checkpatch issues for upcomming patches according to the sched api file. It changes mostly how to check on null pointer. Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Alexander Aring <aring@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net_sched: red: Avoid illegal valuesNogah Frankel2017-12-051-0/+3
| | | | | | | | | Check the qmin & qmax values doesn't overflow for the given Wlog value. Check that qmin <= qmax. Fixes: a783474591f2 ("[PKT_SCHED]: Generic RED layer") Signed-off-by: Nogah Frankel <nogahf@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* netlink: pass extended ACK struct to parsing functionsJohannes Berg2017-04-131-2/+2
| | | | | | | | | Pass the new extended ACK reporting struct to all of the generic netlink parsing functions. For now, pass NULL in almost all callers (except for some in the core.) Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net_sched: drop packets after root qdisc lock is releasedEric Dumazet2016-06-251-3/+4
| | | | | | | | | | | | | | | | | | | | | | Qdisc performance suffers when packets are dropped at enqueue() time because drops (kfree_skb()) are done while qdisc lock is held, delaying a dequeue() draining the queue. Nominal throughput can be reduced by 50 % when this happens, at a time we would like the dequeue() to proceed as fast as possible. Even FQ is vulnerable to this problem, while one of FQ goals was to provide some flow isolation. This patch adds a 'struct sk_buff **to_free' parameter to all qdisc->enqueue(), and in qdisc_drop() helper. I measured a performance increase of up to 12 %, but this patch is a prereq so that future batches in enqueue() can fly. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* sched: remove qdisc->dropFlorian Westphal2016-06-081-35/+0
| | | | | | | | | after removal of TCA_CBQ_OVL_STRATEGY from cbq scheduler, there are no more callers of ->drop() outside of other ->drop functions, i.e. nothing calls them. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: sched: drop all special handling of tx_queue_len == 0Phil Sutter2015-08-181-5/+3
| | | | | | | | | | | | | Those were all workarounds for the formerly double meaning of tx_queue_len, which broke scheduling algorithms if untreated. Now that all in-tree drivers have been converted away from setting tx_queue_len = 0, it should be safe to drop these workarounds for categorically broken setups. Signed-off-by: Phil Sutter <phil@nwl.cc> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2015-05-131-2/+2
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Four minor merge conflicts: 1) qca_spi.c renamed the local variable used for the SPI device from spi_device to spi, meanwhile the spi_set_drvdata() call got moved further up in the probe function. 2) Two changes were both adding new members to codel params structure, and thus we had overlapping changes to the initializer function. 3) 'net' was making a fix to sk_release_kernel() which is completely removed in 'net-next'. 4) In net_namespace.c, the rtnl_net_fill() call for GET operations had the command value fixed, meanwhile 'net-next' adjusted the argument signature a bit. This also matches example merge resolutions posted by Stephen Rothwell over the past two days. Signed-off-by: David S. Miller <davem@davemloft.net>
| * net_sched: gred: use correct backlog value in WRED modeDavid Ward2015-05-111-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | In WRED mode, the backlog for a single virtual queue (VQ) should not be used to determine queue behavior; instead the backlog is summed across all VQs. This sum is currently used when calculating the average queue lengths. It also needs to be used when determining if the queue's hard limit has been reached, or when reporting each VQ's backlog via netlink. q->backlog will only be used if the queue switches out of WRED mode. Signed-off-by: David Ward <david.ward@ll.mit.edu> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net_sched: gred: add TCA_GRED_LIMIT attributeDavid Ward2015-05-121-4/+24
|/ | | | | | | | | | | | | | | | | | | | | In a GRED qdisc, if the default "virtual queue" (VQ) does not have drop parameters configured, then packets for the default VQ are not subjected to RED and are only dropped if the queue is larger than the net_device's tx_queue_len. This behavior is useful for WRED mode, since these packets will still influence the calculated average queue length and (therefore) the drop probability for all of the other VQs. However, for some drivers tx_queue_len is zero. In other cases the user may wish to make the limit the same for all VQs (including the default VQ with no drop parameters). This change adds a TCA_GRED_LIMIT attribute to set the GRED queue limit, in bytes, during qdisc setup. (This limit is in bytes to be consistent with the drop parameters.) The default limit is the same as for a bfifo queue (tx_queue_len * psched_mtu). If the drop parameters of any VQ are configured with a smaller limit than the GRED queue limit, that VQ will still observe the smaller limit instead. Signed-off-by: David Ward <david.ward@ll.mit.edu> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: sched: implement qstat helper routinesJohn Fastabend2014-09-301-2/+2
| | | | | | | | | This adds helpers to manipulate qstats logic and replaces locations that touch the counters directly. This simplifies future patches to push qstats onto per cpu counters. Signed-off-by: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net_sched: replace pr_warning with pr_warnYang Yingliang2013-12-311-2/+2
| | | | | | | Prefer pr_warn(... to pr_warning(... Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net_sched: gred: actually perform idling in WRED modeDavid Ward2012-09-131-11/+15
| | | | | | | | | | | | | | | | | | gred_dequeue() and gred_drop() do not seem to get called when the queue is empty, meaning that we never start idling while in WRED mode. And since qidlestart is not stored by gred_store_wred_set(), we would never stop idling while in WRED mode if we ever started. This messes up the average queue size calculation that influences packet marking/dropping behavior. Now, we start WRED mode idling as we are removing the last packet from the queue. Also we now actually stop WRED mode idling when we are enqueuing a packet. Cc: Bruce Osler <brosler@cisco.com> Signed-off-by: David Ward <david.ward@ll.mit.edu> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net_sched: gred: fix qave reporting via netlinkDavid Ward2012-09-131-1/+4
| | | | | | | | | | | | | | q->vars.qavg is a Wlog scaled value, but q->backlog is not. In order to pass q->vars.qavg as the backlog value, we need to un-scale it. Additionally, the qave value returned via netlink should not be Wlog scaled, so we need to un-scale the result of red_calc_qavg(). This caused artificially high values for "Average Queue" to be shown by 'tc -s -d qdisc', but did not affect the actual operation of GRED. Signed-off-by: David Ward <david.ward@ll.mit.edu> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net_sched: gred: eliminate redundant DP prio comparisonsDavid Ward2012-09-131-3/+2
| | | | | | | | | Each pair of DPs only needs to be compared once when searching for a non-unique prio value. Signed-off-by: David Ward <david.ward@ll.mit.edu> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net_sched: gred: correct comment about qavg calculation in RIO modeDavid Ward2012-09-131-1/+1
| | | | | | Signed-off-by: David Ward <david.ward@ll.mit.edu> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: Convert net_ratelimit uses to net_<level>_ratelimitedJoe Perches2012-05-151-8/+4
| | | | | | | | | | Standardize the net core ratelimited logging functions. Coalesce formats, align arguments. Change a printk then vprintk sequence to use printf extension %pV. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2012-04-231-5/+2
|\ | | | | | | | | | | | | | | | | | | | | | | | | Fix merge between commit 3adadc08cc1e ("net ax25: Reorder ax25_exit to remove races") and commit 0ca7a4c87d27 ("net ax25: Simplify and cleanup the ax25 sysctl handling") The former moved around the sysctl register/unregister calls, the later simply removed them. With help from Stephen Rothwell. Signed-off-by: David S. Miller <davem@davemloft.net>
| * net_sched: gred: Fix oops in gred_dump() in WRED modeDavid Ward2012-04-161-5/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | A parameter set exists for WRED mode, called wred_set, to hold the same values for qavg and qidlestart across all VQs. The WRED mode values had been previously held in the VQ for the default DP. After these values were moved to wred_set, the VQ for the default DP was no longer created automatically (so that it could be omitted on purpose, to have packets in the default DP enqueued directly to the device without using RED). However, gred_dump() was overlooked during that change; in WRED mode it still reads qavg/qidlestart from the VQ for the default DP, which might not even exist. As a result, this command sequence will cause an oops: tc qdisc add dev $DEV handle $HANDLE parent $PARENT gred setup \ DPs 3 default 2 grio tc qdisc change dev $DEV handle $HANDLE gred DP 0 prio 8 $RED_OPTIONS tc qdisc change dev $DEV handle $HANDLE gred DP 1 prio 8 $RED_OPTIONS This fixes gred_dump() in WRED mode to use the values held in wred_set. Signed-off-by: David Ward <david.ward@ll.mit.edu> Signed-off-by: David S. Miller <davem@davemloft.net>
* | pkt_sched: Stop using NLA_PUT*().David S. Miller2012-04-011-2/+4
|/ | | | | | | These macros contain a hidden goto, and are thus extremely error prone and make code hard to audit. Signed-off-by: David S. Miller <davem@davemloft.net>
* net_sched: red: split red_parms into parms and varsEric Dumazet2012-01-051-21/+24
| | | | | | | | | | | | | | | | | | This patch splits the red_parms structure into two components. One holding the RED 'constant' parameters, and one containing the variables. This permits a size reduction of GRED qdisc, and is a preliminary step to add an optional RED unit to SFQ. SFQRED will have a single red_parms structure shared by all flows, and a private red_vars per flow. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> CC: Dave Taht <dave.taht@gmail.com> CC: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* sch_gred: prefer GFP_KERNEL allocationsEric Dumazet2011-12-161-7/+11
| | | | | | | | | | | | | | In control path, its better to use GFP_KERNEL allocations where possible. Before taking qdisc spinlock, we preallocate memory just in case we'll need it in gred_change_vq() This is a followup to commit 3f1e6d3fd37b (sch_gred: should not use GFP_KERNEL while holding a spinlock) Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2011-12-161-1/+1
|\ | | | | | | | | | | | | Conflicts: drivers/net/ethernet/freescale/fsl_pq_mdio.c net/batman-adv/translation-table.c net/ipv6/route.c
| * sch_gred: should not use GFP_KERNEL while holding a spinlockEric Dumazet2011-12-121-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | gred_change_vq() is called under sch_tree_lock(sch). This means a spinlock is held, and we are not allowed to sleep in this context. We might pre-allocate memory using GFP_KERNEL before taking spinlock, but this is not suitable for stable material. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | sch_red: generalize accurate MAX_P support to RED/GRED/CHOKEEric Dumazet2011-12-091-4/+18
|/ | | | | | | | | | | | | | | | | | | | | Now RED uses a Q0.32 number to store max_p (max probability), allow RED/GRED/CHOKE to use/report full resolution at config/dump time. Old tc binaries are non aware of new attributes, and still set/get Plog. New tc binary set/get both Plog and max_p for backward compatibility, they display "probability value" if they get max_p from new kernels. # tc -d qdisc show dev ... ... qdisc red 10: parent 1:1 limit 360Kb min 30Kb max 90Kb ecn ewma 5 probability 0.09 Scell_log 15 Make sure we avoid potential divides by 0 in reciprocal_value(), if (max_th - min_th) is big. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net_sched: cleanupsEric Dumazet2011-01-191-43/+42
| | | | | | | | | Cleanup net/sched code to current CodingStyle and practices. Reduce inline abuse Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* include cleanup: Update gfp.h and slab.h includes to prepare for breaking ↵Tejun Heo2010-03-301-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
* pkt_sched: Remove qdisc->ops->requeue() etc.Jarek Poplawski2008-11-131-21/+0
| | | | | | | | | | | | | | After implementing qdisc->ops->peek() and changing sch_netem into classless qdisc there are no more qdisc->ops->requeue() users. This patch removes this method with its wrappers (qdisc_requeue()), and also unused qdisc->requeue structure. There are a few minor fixes of warnings (htb_enqueue()) and comments btw. The idea to kill ->requeue() and a similar patch were first developed by David S. Miller. Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* pkt_sched: Add qdisc->ops->peek() implementation.Jarek Poplawski2008-10-311-0/+1
| | | | | | | | Add qdisc->ops->peek() implementation for work-conserving qdiscs. With feedback from Patrick McHardy. Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net_sched: Add accessor function for packet length for qdiscsJussi Kivilinna2008-07-201-6/+6
| | | | | Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
* pkt_sched: Remove 'dev' member of struct Qdisc.David S. Miller2008-07-081-1/+1
| | | | | | | | | It can be obtained via the netdev_queue. So create a helper routine, qdisc_dev(), to make the transformations nicer looking. Now, qdisc_alloc() now no longer needs a net_device pointer argument. Signed-off-by: David S. Miller <davem@davemloft.net>
* netlink: Improve returned error codesThomas Graf2008-06-031-1/+2
| | | | | | | | | | | Make nlmsg_trim(), nlmsg_cancel(), genlmsg_cancel(), and nla_nest_cancel() void functions. Return -EMSGSIZE instead of -1 if the provided message buffer is not big enough. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
* [NET_SCHED]: Use nla_policy for attribute validation in packet schedulersPatrick McHardy2008-01-281-6/+10
| | | | | Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* [NET_SCHED]: Propagate nla_parse return valuePatrick McHardy2008-01-281-3/+13
| | | | | | | | nla_parse() returns more detailed errno codes, propagate them back on error. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* [NET_SCHED]: Convert packet schedulers from rtnetlink to new netlink APIPatrick McHardy2008-01-281-27/+32
| | | | | | | | | | | 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>
* [NET]: Move Qdisc_class_ops and Qdisc_ops in appropriate sections.Eric Dumazet2008-01-281-1/+1
| | | | | | | | | | 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>
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