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2016-07-20bpf: make xdp sample variable names more meaningfulBrenden Blanco
The naming choice of index is not terribly descriptive, and dropcnt is in fact incorrect for xdp2. Pick better names for these: ipproto and rxcnt. Signed-off-by: Brenden Blanco <bblanco@plumgrid.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-07-19bpf: add sample for xdp forwarding and rewriteBrenden Blanco
Add a sample that rewrites and forwards packets out on the same interface. Observed single core forwarding performance of ~10Mpps. Since the mlx4 driver under test recycles every single packet page, the perf output shows almost exclusively just the ring management and bpf program work. Slowdowns are likely occurring due to cache misses. Signed-off-by: Brenden Blanco <bblanco@plumgrid.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-07-19Add sample for adding simple drop program to linkBrenden Blanco
Add a sample program that only drops packets at the BPF_PROG_TYPE_XDP_RX hook of a link. With the drop-only program, observed single core rate is ~20Mpps. Other tests were run, for instance without the dropcnt increment or without reading from the packet header, the packet rate was mostly unchanged. $ perf record -a samples/bpf/xdp1 $(</sys/class/net/eth0/ifindex) proto 17: 20403027 drops/s ./pktgen_sample03_burst_single_flow.sh -i $DEV -d $IP -m $MAC -t 4 Running... ctrl^C to stop Device: eth4@0 Result: OK: 11791017(c11788327+d2689) usec, 59622913 (60byte,0frags) 5056638pps 2427Mb/sec (2427186240bps) errors: 0 Device: eth4@1 Result: OK: 11791012(c11787906+d3106) usec, 60526944 (60byte,0frags) 5133311pps 2463Mb/sec (2463989280bps) errors: 0 Device: eth4@2 Result: OK: 11791019(c11788249+d2769) usec, 59868091 (60byte,0frags) 5077431pps 2437Mb/sec (2437166880bps) errors: 0 Device: eth4@3 Result: OK: 11795039(c11792403+d2636) usec, 59483181 (60byte,0frags) 5043067pps 2420Mb/sec (2420672160bps) errors: 0 perf report --no-children: 26.05% ksoftirqd/0 [mlx4_en] [k] mlx4_en_process_rx_cq 17.84% ksoftirqd/0 [mlx4_en] [k] mlx4_en_alloc_frags 5.52% ksoftirqd/0 [mlx4_en] [k] mlx4_en_free_frag 4.90% swapper [kernel.vmlinux] [k] poll_idle 4.14% ksoftirqd/0 [kernel.vmlinux] [k] get_page_from_freelist 2.78% ksoftirqd/0 [kernel.vmlinux] [k] __free_pages_ok 2.57% ksoftirqd/0 [kernel.vmlinux] [k] bpf_map_lookup_elem 2.51% swapper [mlx4_en] [k] mlx4_en_process_rx_cq 1.94% ksoftirqd/0 [kernel.vmlinux] [k] percpu_array_map_lookup_elem 1.45% swapper [mlx4_en] [k] mlx4_en_alloc_frags 1.35% ksoftirqd/0 [kernel.vmlinux] [k] free_one_page 1.33% swapper [kernel.vmlinux] [k] intel_idle 1.04% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c5c5 0.96% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c58d 0.93% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c6ee 0.92% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c6b9 0.89% ksoftirqd/0 [kernel.vmlinux] [k] __alloc_pages_nodemask 0.83% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c686 0.83% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c5d5 0.78% ksoftirqd/0 [mlx4_en] [k] mlx4_alloc_pages.isra.23 0.77% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c5b4 0.77% ksoftirqd/0 [kernel.vmlinux] [k] net_rx_action machine specs: receiver - Intel E5-1630 v3 @ 3.70GHz sender - Intel E5645 @ 2.40GHz Mellanox ConnectX-3 @40G Signed-off-by: Brenden Blanco <bblanco@plumgrid.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-07-19kprobes: Add arm64 case in kprobe example moduleSandeepa Prabhu
Add info prints in sample kprobe handlers for ARM64 Signed-off-by: Sandeepa Prabhu <sandeepa.s.prabhu@gmail.com> Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-07-14pktgen: remove sample script pktgen.conf-1-1-rdosJesper Dangaard Brouer
Removing the pktgen sample script pktgen.conf-1-1-rdos, because it does not contain anything that is not covered by the other and newer style sample scripts. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-07-14pktgen: add sample script pktgen_sample05_flow_per_thread.shJesper Dangaard Brouer
This pktgen sample script is useful for scalability testing a receiver. The script will simply generate one flow per thread (option -t N) using the thread number as part of the source IP-address. The single flow sample (pktgen_sample03_burst_single_flow.sh) have become quite popular, but it is important that developers also make sure to benchmark scalability of multiple receive queues. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-07-14pktgen: add sample script pktgen_sample04_many_flows.shJesper Dangaard Brouer
Adding a pktgen sample script that demonstrates how to use pktgen for simulating flows. Script will generate a certain number of concurrent flows ($FLOWS) and each flow will contain $FLOWLEN packets, which will be send back-to-back, before switching to a new flow, due to flag FLOW_SEQ. This script obsoletes the old sample script 'pktgen.conf-1-1-flows', which is removed. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-07-08[media] vb2: replace void *alloc_ctxs by struct device *alloc_devsHans Verkuil
Make this a proper typed array. Drop the old allocate context code since that is no longer used. Note that the memops functions now get a struct device pointer instead of the struct device ** that was there initially (actually a void pointer to a struct containing only a struct device pointer). This code is now a lot cleaner. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: Sakari Ailus <sakari.ailus@iki.fi> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-08[media] v4l2-pci-skeleton: set q->dev instead of allocating a contextHans Verkuil
Stop using alloc_ctx as that is now no longer needed. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-07samples/seccomp: Add standalone config optionOlof Johansson
Add a separate Kconfig option for SAMPLES_SECCOMP. Main reason for this is that, just like other samples, it's forced to be a module. Without this, since the sample is a target only controlled by CONFIG_SECCOMP_FILTER, the samples will be built before include files are put in place properly. For example, from an arm64 allmodconfig built with "make -sk -j 32" (without specific target), the following happens: samples/seccomp/bpf-fancy.c:13:27: fatal error: linux/seccomp.h: No such file or directory samples/seccomp/bpf-helper.h:20:50: fatal error: linux/seccomp.h: No such file or directory samples/seccomp/dropper.c:20:27: fatal error: linux/seccomp.h: No such file or directory samples/seccomp/bpf-direct.c:21:27: fatal error: linux/seccomp.h: No such file or directory So, just stick to the same format as other samples. Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Kees Cook <keescook@chromium.org>
2016-07-04net: samples: pktgen mode samples/tests for qdisc layerJohn Fastabend
This adds samples for pktgen to use with new mode to inject pkts into the qdisc layer. This also doubles as nice test cases to test any patches against qdisc layer. Signed-off-by: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-07-01cgroup: bpf: Add an example to do cgroup checking in BPFMartin KaFai Lau
test_cgrp2_array_pin.c: A userland program that creates a bpf_map (BPF_MAP_TYPE_GROUP_ARRAY), pouplates/updates it with a cgroup2's backed fd and pins it to a bpf-fs's file. The pinned file can be loaded by tc and then used by the bpf prog later. This program can also update an existing pinned array and it could be useful for debugging/testing purpose. test_cgrp2_tc_kern.c: A bpf prog which should be loaded by tc. It is to demonstrate the usage of bpf_skb_in_cgroup. test_cgrp2_tc.sh: A script that glues the test_cgrp2_array_pin.c and test_cgrp2_tc_kern.c together. The idea is like: 1. Load the test_cgrp2_tc_kern.o by tc 2. Use test_cgrp2_array_pin.c to populate a BPF_MAP_TYPE_CGROUP_ARRAY with a cgroup fd 3. Do a 'ping -6 ff02::1%ve' to ensure the packet has been dropped because of a match on the cgroup Most of the lines in test_cgrp2_tc.sh is the boilerplate to setup the cgroup/bpf-fs/net-devices/netns...etc. It is not bulletproof on errors but should work well enough and give enough debug info if things did not go well. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Cc: Alexei Starovoitov <ast@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Tejun Heo <tj@kernel.org> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-06-25samples/bpf: set max locked memory to ulimitedWilliam Tu
Signed-off-by: William Tu <u9012063@gmail.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-06-20tracing: Add trace_printk sample codeSteven Rostedt (Red Hat)
Add sample code to test trace_printk(). The trace_printk() functions should never be used in production code. This makes testing it a bit more difficult. Having a sample module that can test use cases of trace_printk() can help out. Currently it just tests trace_printk() where it will be converted into: trace_bputs() trace_puts() trace_bprintk() as well as staying as the normal _trace_printk(). It also tests its use in interrupt context as that will test the auxilery buffers. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2016-05-20samples/kprobes: print out the symbol name for the hooksHuang Shijie
Print out the symbol name for the hooks, it makes the logs more readable. Link: http://lkml.kernel.org/r/1463535417-29637-2-git-send-email-shijie.huang@arm.com Signed-off-by: Huang Shijie <shijie.huang@arm.com> Cc: Petr Mladek <pmladek@suse.com> Cc: Steve Capper <steve.capper@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-05-20samples/kprobes: add a new module parameterHuang Shijie
Add a new module parameter which can be used as the symbol name. Without this patch, we can only test the "_do_fork" function with this kernel module. With this patch, the module becomes more flexible; we can test any functions with this module with # insmod kprobe_example.ko symbol="xxx" Link: http://lkml.kernel.org/r/1463535417-29637-1-git-send-email-shijie.huang@arm.com Signed-off-by: Huang Shijie <shijie.huang@arm.com> Cc: Petr Mladek <pmladek@suse.com> Cc: Steve Capper <steve.capper@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-05-20kprobes: add the "tls" argument for j_do_forkHuang Shijie
Commit 3033f14ab78c ("clone: support passing tls argument via C rather than pt_regs magic") added the tls argument for _do_fork(). This patch adds the "tls" argument for j_do_fork to make it match _do_fork(). Signed-off-by: Huang Shijie <shijie.huang@arm.com> Acked-by: Steve Capper <steve.capper@arm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Thiago Macieira <thiago.macieira@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-05-19Merge tag 'docs-for-linus' of git://git.lwn.net/linuxLinus Torvalds
Pull Documentation updates from Jon Corbet: "A bit busier this time around. The most interesting thing (IMO) this time around is some beginning infrastructural work to allow documents to be written using restructured text. Maybe someday, in a galaxy far far away, we'll be able to eliminate the DocBook dependency and have a much better integrated set of kernel docs. Someday. Beyond that, there's a new document on security hardening from Kees, the movement of some sample code over to samples/, a number of improvements to the serial docs from Geert, and the usual collection of corrections, typo fixes, etc" * tag 'docs-for-linus' of git://git.lwn.net/linux: (55 commits) doc: self-protection: provide initial details serial: doc: Use port->state instead of info serial: doc: Always refer to tty_port->mutex Documentation: vm: Spelling s/paltform/platform/g Documentation/memcg: update kmem limit doc as codes behavior docproc: print a comment about autogeneration for rst output docproc: add support for reStructuredText format via --rst option docproc: abstract terminating lines at first space docproc: abstract docproc directive detection docproc: reduce unnecessary indentation docproc: add variables for subcommand and filename kernel-doc: use rst C domain directives and references for types kernel-doc: produce RestructuredText output kernel-doc: rewrite usage description, remove duplicated comments Doc: correct the location of sysrq.c Documentation: fix common spelling mistakes samples: v4l: from Documentation to samples directory samples: connector: from Documentation to samples directory Documentation: xillybus: fix spelling mistake Documentation: x86: fix spelling mistakes ...
2016-05-18Merge tag 'rpmsg-v4.7' of git://github.com/andersson/remoteprocLinus Torvalds
Pull rpmsg updates from Bjorn Andersson: "Refactor rpmsg module registration to follow other subsystems; by introduction of module_rpmsg_driver and hiding of THIS_MODULE from clients" * tag 'rpmsg-v4.7' of git://github.com/andersson/remoteproc: rpmsg: use module_rpmsg_driver in existing drivers and examples rpmsg: add helper macro module_rpmsg_driver rpmsg: drop owner assignment from rpmsg_drivers rpmsg: add THIS_MODULE to rpmsg_driver in rpmsg core
2016-05-18Merge tag 'media/v4.7-1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media Pull media updates from Mauro Carvalho Chehab: - added support for Intersil/Techwell TW686x-based video capture cards - v4l PCI skeleton driver moved to samples directory - Documentation cleanups and improvements - RC: reduced the memory footprint for IR raw events - tpg: Export the tpg code from vivid as a module - adv7180: Add device tree binding documentation - lots of driver improvements and fixes * tag 'media/v4.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (173 commits) [media] exynos-gsc: avoid build warning without CONFIG_OF [media] samples: v4l: from Documentation to samples directory [media] dib0700: add USB ID for another STK8096-PVR ref design based card [media] tvp5150: propagate I2C write error in .s_register callback [media] tvp5150: return I2C write operation failure to callers [media] em28xx: add support for Hauppauge WinTV-dualHD DVB tuner [media] em28xx: add missing USB IDs [media] update cx23885 and em28xx cardlists [media] media: au0828 fix au0828_v4l2_device_register() to not unlock and free [media] c8sectpfe: Rework firmware loading mechanism [media] c8sectpfe: Demote print to dev_dbg [media] c8sectpfe: Fix broken circular buffer wp management [media] media-device: Simplify compat32 logic [media] media: i2c: ths7303: remove redundant assignment on bt [media] dvb-usb: hide unused functions [media] xilinx-vipp: remove unnecessary of_node_put [media] drivers/media/media-devnode: clear private_data before put_device() [media] drivers/media/media-device: move debug log before _devnode_unregister() [media] drivers/media/rc: postpone kfree(rc_dev) [media] media/dvb-core: forward media_create_pad_links() return value ...
2016-05-17Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching Pull livepatching updates from Jiri Kosina: - remove of our own implementation of architecture-specific relocation code and leveraging existing code in the module loader to perform arch-dependent work, from Jessica Yu. The relevant patches have been acked by Rusty (for module.c) and Heiko (for s390). - live patching support for ppc64le, which is a joint work of Michael Ellerman and Torsten Duwe. This is coming from topic branch that is share between livepatching.git and ppc tree. - addition of livepatching documentation from Petr Mladek * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching: livepatch: make object/func-walking helpers more robust livepatch: Add some basic livepatch documentation powerpc/livepatch: Add live patching support on ppc64le powerpc/livepatch: Add livepatch stack to struct thread_info powerpc/livepatch: Add livepatch header livepatch: Allow architectures to specify an alternate ftrace location ftrace: Make ftrace_location_range() global livepatch: robustify klp_register_patch() API error checking Documentation: livepatch: outline Elf format and requirements for patch modules livepatch: reuse module loader code to write relocations module: s390: keep mod_arch_specific for livepatch modules module: preserve Elf information for livepatch modules Elf: add livepatch-specific Elf constants
2016-05-09[media] samples: v4l: from Documentation to samples directoryArnd Bergmann
With the new autoksyms support, we can run into a situation where the v4l pci skeleton module is the only one using some exported symbols that get dropped because they are never referenced by the kernel otherwise, causing a build problem: ERROR: "vb2_dma_contig_memops" [Documentation/video4linux/v4l2-pci-skeleton.ko] undefined! ERROR: "vb2_dma_contig_init_ctx_attrs" [Documentation/video4linux/v4l2-pci-skeleton.ko] undefined! ERROR: "v4l2_match_dv_timings" [Documentation/video4linux/v4l2-pci-skeleton.ko] undefined! ERROR: "v4l2_find_dv_timings_cap" [Documentation/video4linux/v4l2-pci-skeleton.ko] undefined! ERROR: "v4l2_valid_dv_timings" [Documentation/video4linux/v4l2-pci-skeleton.ko] undefined! ERROR: "v4l2_enum_dv_timings_cap" [Documentation/video4linux/v4l2-pci-skeleton.ko] undefined! ERROR: "vb2_dma_contig_cleanup_ctx" [Documentation/video4linux/v4l2-pci-skeleton.ko] undefined! Specifically, we do look in the samples directory for users of symbols, but not the Documentation directory. This solves the build problem by moving the connector sample into the same directory as the other samples. Fixes: 23121ca2b56b ("kbuild: create/adjust generated/autoksyms.h") Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2016-05-06samples/bpf: add verifier testsAlexei Starovoitov
add few tests for "pointer to packet" logic of the verifier Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-05-06samples/bpf: add 'pointer to packet' testsAlexei Starovoitov
parse_simple.c - packet parser exapmle with single length check that filters out udp packets for port 9 parse_varlen.c - variable length parser that understand multiple vlan headers, ipip, ipip6 and ip options to filter out udp or tcp packets on port 9. The packet is parsed layer by layer with multitple length checks. parse_ldabs.c - classic style of packet parsing using LD_ABS instruction. Same functionality as parse_simple. simple = 24.1Mpps per core varlen = 22.7Mpps ldabs = 21.4Mpps Parser with LD_ABS instructions is slower than full direct access parser which does more packet accesses and checks. These examples demonstrate the choice bpf program authors can make between flexibility of the parser vs speed. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-05-06rpmsg: use module_rpmsg_driver in existing drivers and examplesAndrew F. Davis
Existing drivers and examples are updated to use the module_rpmsg_driver helper macro. Signed-off-by: Andrew F. Davis <afd@ti.com> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2016-05-06rpmsg: drop owner assignment from rpmsg_driversAndrew F. Davis
An rpmsg_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Andrew F. Davis <afd@ti.com> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2016-05-04Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
Conflicts: net/ipv4/ip_gre.c Minor conflicts between tunnel bug fixes in net and ipv6 tunnel cleanups in net-next. Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-29samples/bpf: like LLC also verify and allow redefining CLANG commandJesper Dangaard Brouer
Users are likely to manually compile both LLVM 'llc' and 'clang' tools. Thus, also allow redefining CLANG and verify command exist. Makefile implementation wise, the target that verify the command have been generalized. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-29samples/bpf: allow make to be run from samples/bpf/ directoryJesper Dangaard Brouer
It is not intuitive that 'make' must be run from the top level directory with argument "samples/bpf/" to compile these eBPF samples. Introduce a kbuild make file trick that allow make to be run from the "samples/bpf/" directory itself. It basically change to the top level directory and call "make samples/bpf/" with the "/" slash after the directory name. Also add a clean target that only cleans this directory, by taking advantage of the kbuild external module setting M=$PWD. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-29samples/bpf: add a README file to get users startedJesper Dangaard Brouer
Getting started with using examples in samples/bpf/ is not straightforward. There are several dependencies, and specific versions of these dependencies. Just compiling the example tool is also slightly obscure, e.g. one need to call make like: make samples/bpf/ Do notice the "/" slash after the directory name. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-29samples/bpf: Makefile verify LLVM compiler avail and bpf target is supportedJesper Dangaard Brouer
Make compiling samples/bpf more user friendly, by detecting if LLVM compiler tool 'llc' is available, and also detect if the 'bpf' target is available in this version of LLVM. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-29samples/bpf: add back functionality to redefine LLC commandJesper Dangaard Brouer
It is practical to be-able-to redefine the location of the LLVM command 'llc', because not all distros have a LLVM version with bpf target support. Thus, it is sometimes required to compile LLVM from source, and sometimes it is not desired to overwrite the distros default LLVM version. This feature was removed with 128d1514be35 ("samples/bpf: Use llc in PATH, rather than a hardcoded value"). Add this features back. Note that it is possible to redefine the LLC on the make command like: make samples/bpf/ LLC=~/git/llvm/build/bin/llc Fixes: 128d1514be35 ("samples/bpf: Use llc in PATH, rather than a hardcoded value") Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-28samples/bpf: fix trace_output exampleAlexei Starovoitov
llvm cannot always recognize memset as builtin function and optimize it away, so just delete it. It was a leftover from testing of bpf_perf_event_output() with large data structures. Fixes: 39111695b1b8 ("samples: bpf: add bpf_perf_event_output example") Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-28samples: v4l: from Documentation to samples directoryArnd Bergmann
A small bug with the new autoksyms support showed that there are two kernel modules in the Documentation directory that qualify as samples, while all other samples are in the samples/ directory. This patch was originally meant as a workaround for that bug, but it has now been solved in a different way. However, I still think it makes sense as a cleanup to consolidate all sample code in one place. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Acked-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2016-04-28samples: connector: from Documentation to samples directoryArnd Bergmann
A small bug with the new autoksyms support showed that there are two kernel modules in the Documentation directory that qualify as samples, while all other samples are in the samples/ directory. This patch was originally meant as a workaround for that bug, but it has now been solved in a different way. However, I still think it makes sense as a cleanup to consolidate all sample code in one place. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2016-04-14bpf, samples: add test cases for raw stackDaniel Borkmann
This adds test cases mostly around ARG_PTR_TO_RAW_STACK to check the verifier behaviour. [...] #84 raw_stack: no skb_load_bytes OK #85 raw_stack: skb_load_bytes, no init OK #86 raw_stack: skb_load_bytes, init OK #87 raw_stack: skb_load_bytes, spilled regs around bounds OK #88 raw_stack: skb_load_bytes, spilled regs corruption OK #89 raw_stack: skb_load_bytes, spilled regs corruption 2 OK #90 raw_stack: skb_load_bytes, spilled regs + data OK #91 raw_stack: skb_load_bytes, invalid access 1 OK #92 raw_stack: skb_load_bytes, invalid access 2 OK #93 raw_stack: skb_load_bytes, invalid access 3 OK #94 raw_stack: skb_load_bytes, invalid access 4 OK #95 raw_stack: skb_load_bytes, invalid access 5 OK #96 raw_stack: skb_load_bytes, invalid access 6 OK #97 raw_stack: skb_load_bytes, large access OK Summary: 98 PASSED, 0 FAILED Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-14bpf, samples: don't zero data when not neededDaniel Borkmann
Remove the zero initialization in the sample programs where appropriate. Note that this is an optimization which is now possible, old programs still doing the zero initialization are just fine as well. Also, make sure we don't have padding issues when we don't memset() the entire struct anymore. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-09Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
2016-04-07samples/bpf: add tracepoint vs kprobe performance testsAlexei Starovoitov
the first microbenchmark does fd=open("/proc/self/comm"); for() { write(fd, "test"); } and on 4 cpus in parallel: writes per sec base (no tracepoints, no kprobes) 930k with kprobe at __set_task_comm() 420k with tracepoint at task:task_rename 730k For kprobe + full bpf program manully fetches oldcomm, newcomm via bpf_probe_read. For tracepint bpf program does nothing, since arguments are copied by tracepoint. 2nd microbenchmark does: fd=open("/dev/urandom"); for() { read(fd, buf); } and on 4 cpus in parallel: reads per sec base (no tracepoints, no kprobes) 300k with kprobe at urandom_read() 279k with tracepoint at random:urandom_read 290k bpf progs attached to kprobe and tracepoint are noop. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-07samples/bpf: tracepoint exampleAlexei Starovoitov
modify offwaketime to work with sched/sched_switch tracepoint instead of kprobe into finish_task_switch Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-07samples/bpf: add tracepoint support to bpf loaderAlexei Starovoitov
Recognize "tracepoint/" section name prefix and attach the program to that tracepoint. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-06samples/bpf: Enable powerpc supportNaveen N. Rao
Add the necessary definitions for building bpf samples on ppc. Since ppc doesn't store function return address on the stack, modify how PT_REGS_RET() and PT_REGS_FP() work. Also, introduce PT_REGS_IP() to access the instruction pointer. Cc: Alexei Starovoitov <ast@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: David S. Miller <davem@davemloft.net> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-06samples/bpf: Use llc in PATH, rather than a hardcoded valueNaveen N. Rao
While at it, remove the generation of .s files and fix some typos in the related comment. Cc: Alexei Starovoitov <ast@fb.com> Cc: David S. Miller <davem@davemloft.net> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-06samples/bpf: Fix build breakage with map_perf_test_user.cNaveen N. Rao
Building BPF samples is failing with the below error: samples/bpf/map_perf_test_user.c: In function ‘main’: samples/bpf/map_perf_test_user.c:134:9: error: variable ‘r’ has initializer but incomplete type struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; ^ samples/bpf/map_perf_test_user.c:134:21: error: ‘RLIM_INFINITY’ undeclared (first use in this function) struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; ^ samples/bpf/map_perf_test_user.c:134:21: note: each undeclared identifier is reported only once for each function it appears in samples/bpf/map_perf_test_user.c:134:9: warning: excess elements in struct initializer [enabled by default] struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; ^ samples/bpf/map_perf_test_user.c:134:9: warning: (near initialization for ‘r’) [enabled by default] samples/bpf/map_perf_test_user.c:134:9: warning: excess elements in struct initializer [enabled by default] samples/bpf/map_perf_test_user.c:134:9: warning: (near initialization for ‘r’) [enabled by default] samples/bpf/map_perf_test_user.c:134:16: error: storage size of ‘r’ isn’t known struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; ^ samples/bpf/map_perf_test_user.c:139:2: warning: implicit declaration of function ‘setrlimit’ [-Wimplicit-function-declaration] setrlimit(RLIMIT_MEMLOCK, &r); ^ samples/bpf/map_perf_test_user.c:139:12: error: ‘RLIMIT_MEMLOCK’ undeclared (first use in this function) setrlimit(RLIMIT_MEMLOCK, &r); ^ samples/bpf/map_perf_test_user.c:134:16: warning: unused variable ‘r’ [-Wunused-variable] struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; ^ make[2]: *** [samples/bpf/map_perf_test_user.o] Error 1 Fix this by including the necessary header file. Cc: Alexei Starovoitov <ast@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: David S. Miller <davem@davemloft.net> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-01livepatch: reuse module loader code to write relocationsJessica Yu
Reuse module loader code to write relocations, thereby eliminating the need for architecture specific relocation code in livepatch. Specifically, reuse the apply_relocate_add() function in the module loader to write relocations instead of duplicating functionality in livepatch's arch-dependent klp_write_module_reloc() function. In order to accomplish this, livepatch modules manage their own relocation sections (marked with the SHF_RELA_LIVEPATCH section flag) and livepatch-specific symbols (marked with SHN_LIVEPATCH symbol section index). To apply livepatch relocation sections, livepatch symbols referenced by relocs are resolved and then apply_relocate_add() is called to apply those relocations. In addition, remove x86 livepatch relocation code and the s390 klp_write_module_reloc() function stub. They are no longer needed since relocation work has been offloaded to module loader. Lastly, mark the module as a livepatch module so that the module loader canappropriately identify and initialize it. Signed-off-by: Jessica Yu <jeyu@redhat.com> Reviewed-by: Miroslav Benes <mbenes@suse.cz> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # for s390 changes Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2016-03-08samples/bpf: add map performance testAlexei Starovoitov
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: David S. Miller <davem@davemloft.net>
2016-03-08samples/bpf: stress test bpf_get_stackidAlexei Starovoitov
increase stress by also calling bpf_get_stackid() from various *spin* functions Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08samples/bpf: add bpf map stress testAlexei Starovoitov
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: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08samples/bpf: test both pre-alloc and normal mapsAlexei Starovoitov
extend test coveraged to include pre-allocated and run-time alloc maps Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08samples/bpf: add map_flags to bpf loaderAlexei Starovoitov
note old loader is compatible with new kernel. map_flags are optional Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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