- 09 Mar, 2016 5 commits
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Tom Herbert authored
This is a convenience function that returns the next entry in an RCU list or NULL if at the end of the list. Signed-off-by:
Tom Herbert <tom@herbertland.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Alexei Starovoitov authored
performance tests for hash map and per-cpu hash map with and without pre-allocation Signed-off-by:
Alexei Starovoitov <ast@kernel.org> Signed-off-by:
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Alexei Starovoitov authored
increase stress by also calling bpf_get_stackid() from various *spin* functions Signed-off-by:
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Alexei Starovoitov authored
this test calls bpf programs from different contexts: from inside of slub, from rcu, from pretty much everywhere, since it kprobes all spin_lock functions. It stresses the bpf hash and percpu map pre-allocation, deallocation logic and call_rcu mechanisms. User space part adding more stress by walking and deleting map elements. Note that due to nature bpf_load.c the earlier kprobe+bpf programs are already active while loader loads new programs, creates new kprobes and attaches them. Signed-off-by:
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Daniel Borkmann authored
Helpers like ip_tunnel_info_opts_{get,set}() are only available if CONFIG_INET is set, thus add an empty definition into the header for the !CONFIG_INET case, where already other empty inline helpers are defined. This avoids ifdef kludge inside filter.c, but also vxlan and geneve themself where this facility can only be used with, depend on INET being set. For the !INET case TUNNEL_OPTIONS_PRESENT would never be set in flags. Fixes: 14ca0751 ("bpf: support for access to tunnel options") Reported-by:Fengguang Wu <fengguang.wu@intel.com> Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Acked-by:
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- 08 Mar, 2016 34 commits
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David S. Miller authored
Alexei Starovoitov says: ==================== bpf: map pre-alloc v1->v2: . fix few issues spotted by Daniel . converted stackmap into pre-allocation as well . added a workaround for lockdep false positive . added pcpu_freelist_populate to be used by hashmap and stackmap this path set switches bpf hash map to use pre-allocation by default and introduces BPF_F_NO_PREALLOC flag to keep old behavior for cases where full map pre-allocation is too memory expensive. Some time back Daniel Wagner reported crashes when bpf hash map is used to compute time intervals between preempt_disable->preempt_enable and recently Tom Zanussi reported a dead lock in iovisor/bcc/funccount tool if it's used to count the number of invocations of kernel '*spin*' functions. Both problems are due to the recursive use of slub and can only be solved by pre-allocating all map elements. A lot of different solutions were considered. Many implemented, but at the end pre-allocation seems to be the only feasible answer. As far as pre-allocation goes it also was implemented 4 different ways: - simple free-list with single lock - percpu_ida with optimizations - blk-mq-tag variant customized for bpf use case - percpu_freelist For bpf style of alloc/free patterns percpu_freelist is the best and implemented in this patch set. Detailed performance numbers in patch 3. Patch 2 introduces percpu_freelist Patch 1 fixes simple deadlocks due to missing recursion checks Patch 5: converts stackmap to pre-allocation Patches 6-9: prepare test infra Patch 10: stress test for hash map infra. It attaches to spin_lock functions and bpf_map_update/delete are called from different contexts Patch 11: stress for bpf_get_stackid Patch 12: map performance test Reported-by:
Daniel Wagner <daniel.wagner@bmw-carit.de> Reported-by:
Tom Zanussi <tom.zanussi@linux.intel.com> ==================== Signed-off-by:
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Alexei Starovoitov authored
extend test coveraged to include pre-allocated and run-time alloc maps Signed-off-by:
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Alexei Starovoitov authored
note old loader is compatible with new kernel. map_flags are optional Signed-off-by:
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Alexei Starovoitov authored
move ksym search from offwaketime into library to be reused in other tests Signed-off-by:
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Alexei Starovoitov authored
map creation is typically the first one to fail when rlimits are too low, not enough memory, etc Make this failure scenario more verbose Signed-off-by:
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Alexei Starovoitov authored
It was observed that calling bpf_get_stackid() from a kprobe inside slub or from spin_unlock causes similar deadlock as with hashmap, therefore convert stackmap to use pre-allocated memory. The call_rcu is no longer feasible mechanism, since delayed freeing causes bpf_get_stackid() to fail unpredictably when number of actual stacks is significantly less than user requested max_entries. Since elements are no longer freed into slub, we can push elements into freelist immediately and let them be recycled. However the very unlikley race between user space map_lookup() and program-side recycling is possible: cpu0 cpu1 ---- ---- user does lookup(stackidX) starts copying ips into buffer delete(stackidX) calls bpf_get_stackid() which recyles the element and overwrites with new stack trace To avoid user space seeing a partial stack trace consisting of two merged stack traces, do bucket = xchg(, NULL); copy; xchg(,bucket); to preserve consistent stack trace delivery to user space. Now we can move memset(,0) of left-over element value from critical path of bpf_get_stackid() into slow-path of user space lookup. Also disallow lookup() from bpf program, since it's useless and program shouldn't be messing with collected stack trace. Note that similar race between user space lookup and kernel side updates is also present in hashmap, but it's not a new race. bpf programs were always allowed to modify hash and array map elements while user space is copying them. Fixes: d5a3b1f6 ("bpf: introduce BPF_MAP_TYPE_STACK_TRACE") Signed-off-by: -
Alexei Starovoitov authored
Suggested-by:
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Alexei Starovoitov authored
If kprobe is placed on spin_unlock then calling kmalloc/kfree from bpf programs is not safe, since the following dead lock is possible: kfree->spin_lock(kmem_cache_node->lock)...spin_unlock->kprobe-> bpf_prog->map_update->kmalloc->spin_lock(of the same kmem_cache_node->lock) and deadlocks. The following solutions were considered and some implemented, but eventually discarded - kmem_cache_create for every map - add recursion check to slow-path of slub - use reserved memory in bpf_map_update for in_irq or in preempt_disabled - kmalloc via irq_work At the end pre-allocation of all map elements turned out to be the simplest solution and since the user is charged upfront for all the memory, such pre-allocation doesn't affect the user space visible behavior. Since it's impossible to tell whether kprobe is triggered in a safe location from kmalloc point of view, use pre-allocation by default and introduce new BPF_F_NO_PREALLOC flag. While testing of per-cpu hash maps it was discovered that alloc_percpu(GFP_ATOMIC) has odd corner cases and often fails to allocate memory even when 90% of it is free. The pre-allocation of per-cpu hash elements solves this problem as well. Turned out that bpf_map_update() quickly followed by bpf_map_lookup()+bpf_map_delete() is very common pattern used in many of iovisor/bcc/tools, so there is additional benefit of pre-allocation, since such use cases are must faster. Since all hash map elements are now pre-allocated we can remove atomic increment of htab->count and save few more cycles. Also add bpf_map_precharge_memlock() to check rlimit_memlock early to avoid large malloc/free done by users who don't have sufficient limits. Pre-allocation is done with vmalloc and alloc/free is done via percpu_freelist. Here are performance numbers for different pre-allocation algorithms that were implemented, but discarded in favor of percpu_freelist: 1 cpu: pcpu_ida 2.1M pcpu_ida nolock 2.3M bt 2.4M kmalloc 1.8M hlist+spinlock 2.3M pcpu_freelist 2.6M 4 cpu: pcpu_ida 1.5M pcpu_ida nolock 1.8M bt w/smp_align 1.7M bt no/smp_align 1.1M kmalloc 0.7M hlist+spinlock 0.2M pcpu_freelist 2.0M 8 cpu: pcpu_ida 0.7M bt w/smp_align 0.8M kmalloc 0.4M pcpu_freelist 1.5M 32 cpu: kmalloc 0.13M pcpu_freelist 0.49M pcpu_ida nolock is a modified percpu_ida algorithm without percpu_ida_cpu locks and without cross-cpu tag stealing. It's faster than existing percpu_ida, but not as fast as pcpu_freelist. bt is a variant of block/blk-mq-tag.c simlified and customized for bpf use case. bt w/smp_align is using cache line for every 'long' (similar to blk-mq-tag). bt no/smp_align allocates 'long' bitmasks continuously to save memory. It's comparable to percpu_ida and in some cases faster, but slower than percpu_freelist hlist+spinlock is the simplest free list with single spinlock. As expeceted it has very bad scaling in SMP. kmalloc is existing implementation which is still available via BPF_F_NO_PREALLOC flag. It's significantly slower in single cpu and in 8 cpu setup it's 3 times slower than pre-allocation with pcpu_freelist, but saves memory, so in cases where map->max_entries can be large and number of map update/delete per second is low, it may make sense to use it. Signed-off-by:
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Alexei Starovoitov authored
Introduce simple percpu_freelist to keep single list of elements spread across per-cpu singly linked lists. /* push element into the list */ void pcpu_freelist_push(struct pcpu_freelist *, struct pcpu_freelist_node *); /* pop element from the list */ struct pcpu_freelist_node *pcpu_freelist_pop(struct pcpu_freelist *); The object is pushed to the current cpu list. Pop first trying to get the object from the current cpu list, if it's empty goes to the neigbour cpu list. For bpf program usage pattern the collision rate is very low, since programs push and pop the objects typically on the same cpu. Signed-off-by:
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Alexei Starovoitov authored
if kprobe is placed within update or delete hash map helpers that hold bucket spin lock and triggered bpf program is trying to grab the spinlock for the same bucket on the same cpu, it will deadlock. Fix it by extending existing recursion prevention mechanism. Note, map_lookup and other tracing helpers don't have this problem, since they don't hold any locks and don't modify global data. bpf_trace_printk has its own recursive check and ok as well. Signed-off-by:
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David S. Miller authored
Michal Kubecek says: ==================== ipv6: per netns FIB6 walkers and garbage collector Commit 2ac3ac8f ("ipv6: prevent fib6_run_gc() contention") reduced the risk of contention on FIB6 garbage collector lock on systems with many CPUs. However, one of our customers can still observe heavy contention on fib6_gc_lock which can even trigger the soft lockup detector. This is caused by garbage collector running in forced mode from a timer. While there is one timer per network namespace, the instances of fib6_run_gc() running from them are protected by one global spinlock so that only one garbage collector can run at any moment and other namespaces have to wait. As most relevant data structures are separated per netns, there is little reason for garbage collectors blocking each other. Similar problem exists for walkers: changes in one tree do not need to adjust (and block) walkers traversing FIB trees in other namespaces. This series separates both the walkers infrastructure and garbage collector so that they work independently in network namespaces. v2: get rid of ifdef in ipv6_route_seq_setup_walk(), pass net from callers instead ==================== Signed-off-by:
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Michal Kubeček authored
One of our customers observed issues with FIB6 garbage collectors running in different network namespaces blocking each other, resulting in soft lockups (fib6_run_gc() initiated from timer runs always in forced mode). Now that FIB6 walkers are separated per namespace, there is no more need for instances of fib6_run_gc() in different namespaces blocking each other. There is still a call to icmp6_dst_gc() which operates on shared data but this function is protected by its own shared lock. Signed-off-by:
Michal Kubecek <mkubecek@suse.cz> Reviewed-by:
Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by:
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Michal Kubeček authored
The IPv6 FIB data structures are separated per network namespace but there is still only one global walkers list and one global walker list lock. This means changes in one namespace unnecessarily interfere with walkers in other namespaces. Replace the global list with per-netns lists (and give each its own lock). Signed-off-by:
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Michal Kubeček authored
Global variable gc_args is only used in fib6_run_gc() and functions called from it. As fib6_run_gc() makes sure there is at most one instance of fib6_clean_all() running at any moment, we can replace gc_args with a local variable which will be needed once multiple instances (per netns) of garbage collector are allowed. Signed-off-by:
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David S. Miller authored
Michael Chan says: ==================== bnxt_en: Updates for net-next. Updates to support autoneg for all supported speeds, add PF port statistics, and Advanced Error Reporting. v2: Fixed patch 3 to not use parentheses on function return. ==================== Signed-off-by: -
Satish Baddipadige authored
Add pci_error_handler callbacks to support for pcie advanced error recovery. Signed-off-by:
Satish Baddipadige <sbaddipa@broadcom.com> Signed-off-by:
Michael Chan <michael.chan@broadcom.com> Signed-off-by:
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Michael Chan authored
Include the more useful port statistics in ethtool -S for the PF device. Signed-off-by:
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Michael Chan authored
Include some of the port error counters (e.g. crc) in ->ndo_get_stats64() for the PF device. Signed-off-by:
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Michael Chan authored
Gather periodic port statistics if the device is PF and link is up. This is triggered in bnxt_timer() every one second to request firmware to DMA the counters. Signed-off-by:
Michael Chan <michael.chan@broadocm.com> Signed-off-by:
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Michael Chan authored
Allow all autoneg speeds aupported by firmware to be advertised. If the advertising parameter is 0, then all supported speeds will be advertised. Remove BNXT_ALL_COPPER_ETHTOOL_SPEED which is no longer used as all supported speeds can be advertised. Signed-off-by:
Michael Chan <mchan@broadcom.com> Signed-off-by:
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Michael Chan authored
The supported bits and advertising bits in ethtool have the same definitions. The same is true for the firmware bits. So use the common function to handle the conversion for both supported and advertising bits. v2: Don't use parentheses on function return. Signed-off-by:
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Michael Chan authored
And report actual pause settings to ETHTOOL_GPAUSEPARAM to let ethtool resolve the actual pause settings. Signed-off-by:
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Michael Chan authored
Include the conversion of pause bits and add one extra call layer so that the same refactored function can be reused to get the link partner advertisement bits. Signed-off-by:
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Kyeong Yoo authored
This fix is for dsmark similar to commit 3557619f ("net_sched: prio: use qdisc_dequeue_peeked") and makes use of qdisc_dequeue_peeked() instead of direct dequeue() call. First time, wrr peeks dsmark, which will then peek into sfq. sfq dequeues an skb and it's stored in sch->gso_skb. Next time, wrr tries to dequeue from dsmark, which will call sfq dequeue directly. This results skipping the previously peeked skb. So changed dsmark dequeue to call qdisc_dequeue_peeked() instead to use peeked skb if exists. Signed-off-by:
Kyeong Yoo <kyeong.yoo@alliedtelesis.co.nz> Signed-off-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-nextDavid S. Miller authored
Pablo Neira Ayuso says: ==================== Netfilter/IPVS updates for net-next The following patchset contains Netfilter updates for your net-next tree, they are: 1) Remove useless debug message when deleting IPVS service, from Yannick Brosseau. 2) Get rid of compilation warning when CONFIG_PROC_FS is unset in several spots of the IPVS code, from Arnd Bergmann. 3) Add prandom_u32 support to nft_meta, from Florian Westphal. 4) Remove unused variable in xt_osf, from Sudip Mukherjee. 5) Don't calculate IP checksum twice from netfilter ipv4 defrag hook since fixing af_packet defragmentation issues, from Joe Stringer. 6) On-demand hook registration for iptables from netns. Instead of registering the hooks for every available netns whenever we need one of the support tables, we register this on the specific netns that needs it, patchset from Florian Westphal. 7) Add missing port range selection to nf_tables masquerading support. BTW, just for the record, there is a typo in the description of 5f6c253e ("netfilter: bridge: register hooks only when bridge interface is added") that refers to the cluster match as deprecated, but it is actually the CLUSTERIP target (which registers hooks inconditionally) the one that is scheduled for removal. ==================== Signed-off-by:
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David S. Miller authored
Daniel Borkmann says: ==================== BPF updates Couple of misc updates to BPF, besides others this series adds bpf_csum_diff() to be used with L3 csums, allows for managing tunnel options for collect meta data mode, and enabling ipv6 traffic class for collect meta data in vxlan specifically (geneve already supports it). For more details, please see individual patches. The series requires net to be merged into net-next first to avoid any further pending merge conflicts. ==================== Signed-off-by: -
Daniel Borkmann authored
We can already do that for IPv4, but IPv6 support was missing. Add it for vxlan, so it can be used with collect metadata frontends. Signed-off-by:
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Daniel Borkmann authored
The assumptions from commit 0c1d70af ("net: use dst_cache for vxlan device"), 468dfffc ("geneve: add dst caching support") and 3c1cb4d2 ("net/ipv4: add dst cache support for gre lwtunnels") on dst_cache usage when ip_tunnel_info is used is unfortunately not always valid as assumed. While it seems correct for ip_tunnel_info front-ends such as OVS, eBPF however can fill in ip_tunnel_info for consumers like vxlan, geneve or gre with different remote dsts, tos, etc, therefore they cannot be assumed as packet independent. Right now vxlan, geneve, gre would cache the dst for eBPF and every packet would reuse the same entry that was first created on the initial route lookup. eBPF doesn't store/cache the ip_tunnel_info, so each skb may have a different one. Fix it by adding a flag that checks the ip_tunnel_info. Also the !tos test in vxlan needs to be handeled differently in this context as it is currently inferred from ip_tunnel_info as well if present. ip_tunnel_dst_cache_usable() helper is added for the three tunnel cases, which checks if we can use dst cache. Fixes: 0c1d70af ("net: use dst_cache for vxlan device") Fixes: 468dfffc ("geneve: add dst caching support") Fixes: 3c1cb4d2 ("net/ipv4: add dst cache support for gre lwtunnels") Signed-off-by:
Paolo Abeni <pabeni@redhat.com> Acked-by:
Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by:
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Daniel Borkmann authored
After eBPF being able to programmatically access/manage tunnel key meta data via commit d3aa45ce ("bpf: add helpers to access tunnel metadata") and more recently also for IPv6 through c6c33454 ("bpf: support ipv6 for bpf_skb_{set,get}_tunnel_key"), this work adds two complementary helpers to generically access their auxiliary tunnel options. Geneve and vxlan support this facility. For geneve, TLVs can be pushed, and for the vxlan case its GBP extension. I.e. setting tunnel key for geneve case only makes sense, if we can also read/write TLVs into it. In the GBP case, it provides the flexibility to easily map the group policy ID in combination with other helpers or maps. I chose to model this as two separate helpers, bpf_skb_{set,get}_tunnel_opt(), for a couple of reasons. bpf_skb_{set,get}_tunnel_key() is already rather complex by itself, and there may be cases for tunnel key backends where tunnel options are not always needed. If we would have integrated this into bpf_skb_{set,get}_tunnel_key() nevertheless, we are very limited with remaining helper arguments, so keeping compatibility on structs in case of passing in a flat buffer gets more cumbersome. Separating both also allows for more flexibility and future extensibility, f.e. options could be fed directly from a map, etc. Moreover, change geneve's xmit path to test only for info->options_len instead of TUNNEL_GENEVE_OPT flag. This makes it more consistent with vxlan's xmit path and allows for avoiding to specify a protocol flag in the API on xmit, so it can be protocol agnostic. Having info->options_len is enough information that is needed. Tested with vxlan and geneve. Signed-off-by:
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Daniel Borkmann authored
Added by 9a628224 ("ip_tunnel: Add dont fragment flag."), allow to feed df flag into tunneling facilities (currently supported on TX by vxlan, geneve and gre) as a hint from eBPF's bpf_skb_set_tunnel_key() helper. Signed-off-by:
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Daniel Borkmann authored
They are only used here, so there's no reason they should not be static. Only the vlan push/pop protos are used in the test_bpf suite. Signed-off-by:
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Daniel Borkmann authored
When overwriting parts of the packet with bpf_skb_store_bytes() that were fed previously into skb->hash calculation, we should clear the current hash with skb_clear_hash(), so that a next skb_get_hash() call can determine the correct hash related to this skb. Signed-off-by:
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Daniel Borkmann authored
Commit 7d672345 ("bpf: add generic bpf_csum_diff helper") added a generic checksum diff helper that can feed bpf_l4_csum_replace() with a target __wsum diff that is to be applied to the L4 checksum. This facility is very flexible, can be cascaded, allows for adding, removing, or diffing data, or for calculating the pseudo header checksum from scratch, but it can also be reused for working with the IPv4 header checksum. Thus, analogous to bpf_l4_csum_replace(), add a case for header field value of 0 to change the checksum at a given offset through a new helper csum_replace_by_diff(). Also, in addition to that, this provides an easy to use interface for feeding precalculated diffs f.e. coming from a map. It nicely complements bpf_l3_csum_replace() that currently allows only for csum updates of 2 and 4 byte diffs. Signed-off-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller authored
Several cases of overlapping changes, as well as one instance (vxlan) of a bug fix in 'net' overlapping with code movement in 'net-next'. Signed-off-by:
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- 07 Mar, 2016 1 commit
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git://git.kernel.org/pub/scm/linux/kernel/git/davem/netLinus Torvalds authored
Pull networking fixes from David Miller: 1) Fix ordering of WEXT netlink messages so we don't see a newlink after a dellink, from Johannes Berg. 2) Out of bounds access in minstrel_ht_set_best_prob_rage, from Konstantin Khlebnikov. 3) Paging buffer memory leak in iwlwifi, from Matti Gottlieb. 4) Wrong units used to set initial TCP rto from cached metrics, also from Konstantin Khlebnikov. 5) Fix stale IP options data in the SKB control block from leaking through layers of encapsulation, from Bernie Harris. 6) Zero padding len miscalculated in bnxt_en, from Michael Chan. 7) Only CHECKSUM_PARTIAL packets should be passed down through GSO, fix from Hannes Frederic Sowa. 8) Fix suspend/resume with JME networking devices, from Diego Violat and Guo-Fu Tseng. 9) Checksums not validated properly in bridge multicast support due to the placement of the SKB header pointers at the time of the check, fix from Álvaro Fernández Rojas. 10) Fix hang/tiemout with r8169 if a stats fetch is done while the device is runtime suspended. From Chun-Hao Lin. 11) The forwarding database netlink dump facilities don't track the state of the dump properly, resulting in skipped/missed entries. From Minoura Makoto. 12) Fix regression from a recent 3c59x bug fix, from Neil Horman. 13) Fix list corruption in bna driver, from Ivan Vecera. 14) Big endian machines crash on vlan add in bnx2x, fix from Michal Schmidt. 15) Ethtool RSS configuration not propagated properly in mlx5 driver, from Tariq Toukan. 16) Fix regression in PHY probing in stmmac driver, from Gabriel Fernandez. 17) Fix SKB tailroom calculation in igmp/mld code, from Benjamin Poirier. 18) A past change to skip empty routing headers in ipv6 extention header parsing accidently caused fragment headers to not be matched any longer. Fix from Florian Westphal. 19) eTSEC-106 erratum needs to be applied to more gianfar chips, from Atsushi Nemoto. 20) Fix netdev reference after free via workqueues in usb networking drivers, from Oliver Neukum and Bjørn Mork. 21) mdio->irq is now an array rather than a pointer to dynamic memory, but several drivers were still trying to free it :-/ Fixes from Colin Ian King. 22) act_ipt iptables action forgets to set the family field, thus LOG netfilter targets don't work with it. Fix from Phil Sutter. 23) SKB leak in ibmveth when skb_linearize() fails, from Thomas Falcon. 24) pskb_may_pull() cannot be called with interrupts disabled, fix code that tries to do this in vmxnet3 driver, from Neil Horman. 25) be2net driver leaks iomap'd memory on removal, fix from Douglas Miller. 26) Forgotton RTNL mutex unlock in ppp_create_interface() error paths, from Guillaume Nault. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (97 commits) ppp: release rtnl mutex when interface creation fails cdc_ncm: do not call usbnet_link_change from cdc_ncm_bind tcp: fix tcpi_segs_in after connection establishment net: hns: fix the bug about loopback jme: Fix device PM wakeup API usage jme: Do not enable NIC WoL functions on S0 udp6: fix UDP/IPv6 encap resubmit path be2net: Don't leak iomapped memory on removal. vmxnet3: avoid calling pskb_may_pull with interrupts disabled net: ethernet: Add missing MFD_SYSCON dependency on HAS_IOMEM ibmveth: check return of skb_linearize in ibmveth_start_xmit cdc_ncm: toggle altsetting to force reset before setup usbnet: cleanup after bind() in probe() mlxsw: pci: Correctly determine if descriptor queue is full mlxsw: spectrum: Always decrement bridge's ref count tipc: fix nullptr crash during subscription cancel net: eth: altera: do not free array priv->mdio->irq net/ethoc: do not free array priv->mdio->irq net: sched: fix act_ipt for LOG target asix: do not free array priv->mdio->irq ...
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