kernel/git/stable/linux.git/samples/bpf/spintest_kern.c, branch master

samples/bpf: unify bpf program suffix to .bpf with tracing programs

2023-08-21T22:39:09+00:00

Currently, BPF programs typically have a suffix of .bpf.c. However, some programs still utilize a mixture of _kern.c suffix alongside the naming convention. In order to achieve consistency in the naming of these programs, this commit unifies the inconsistency in the naming convention of BPF kernel programs. Signed-off-by: Daniel T. Lee Link: https://lore.kernel.org/r/20230818090119.477441-4-danieltimlee@gmail.com Signed-off-by: Alexei Starovoitov

samples/bpf: convert to vmlinux.h with tracing programs

2023-08-21T22:39:09+00:00

This commit replaces separate headers with a single vmlinux.h to tracing programs. Thanks to that, we no longer need to define the argument structure for tracing programs directly. For example, argument for the sched_switch tracpepoint (sched_switch_args) can be replaced with the vmlinux.h provided trace_event_raw_sched_switch. Additional defines have been added to the BPF program either directly or through the inclusion of net_shared.h. Defined values are PERF_MAX_STACK_DEPTH, IFNAMSIZ constants and __stringify() macro. This change enables the BPF program to access internal structures with BTF generated "vmlinux.h" header. Signed-off-by: Daniel T. Lee Link: https://lore.kernel.org/r/20230818090119.477441-3-danieltimlee@gmail.com Signed-off-by: Alexei Starovoitov

samples: bpf: Refactor kprobe tracing programs with libbpf

2020-08-25T03:59:35+00:00

For the problem of increasing fragmentation of the bpf loader programs, instead of using bpf_loader.o, which is used in samples/bpf, this commit refactors the existing kprobe tracing programs with libbbpf bpf loader. - For kprobe events pointing to system calls, the SYSCALL() macro in trace_common.h was used. - Adding a kprobe event and attaching a bpf program to it was done through bpf_program_attach(). - Instead of using the existing BPF MAP definition, MAP definition has been refactored with the new BTF-defined MAP format. Signed-off-by: Daniel T. Lee Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20200823085334.9413-3-danieltimlee@gmail.com

samples/bpf: Use consistent include paths for libbpf

2020-01-21T00:37:45+00:00

Fix all files in samples/bpf to include libbpf header files with the bpf/ prefix, to be consistent with external users of the library. Also ensure that all includes of exported libbpf header files (those that are exported on 'make install' of the library) use bracketed includes instead of quoted. To make sure no new files are introduced that doesn't include the bpf/ prefix in its include, remove tools/lib/bpf from the include path entirely, and use tools/lib instead. Fixes: 6910d7d3867a ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir") Signed-off-by: Toke Høiland-Jørgensen Signed-off-by: Alexei Starovoitov Acked-by: Jesper Dangaard Brouer Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/157952560911.1683545.8795966751309534150.stgit@toke.dk

selftests/bpf: Split off tracing-only helpers into bpf_tracing.h

2019-10-08T21:16:03+00:00

Split-off PT_REGS-related helpers into bpf_tracing.h header. Adjust selftests and samples to include it where necessary. Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann Acked-by: John Fastabend Acked-by: Song Liu Link: https://lore.kernel.org/bpf/20191008175942.1769476-5-andriin@fb.com

samples/bpf: Enable powerpc support

2016-04-06T20:01:29+00:00

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 Cc: Daniel Borkmann Cc: David S. Miller Cc: Ananth N Mavinakayanahalli Cc: Michael Ellerman Signed-off-by: Naveen N. Rao Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller

samples/bpf: stress test bpf_get_stackid

2016-03-09T04:22:02+00:00

increase stress by also calling bpf_get_stackid() from various *spin* functions Signed-off-by: Alexei Starovoitov Signed-off-by: David S. Miller

samples/bpf: add bpf map stress test

2016-03-09T04:22:02+00:00

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 Signed-off-by: David S. Miller