kernel/linux.git/samples/bpf/sampleip_user.c, branch v6.12.80

samples/bpf: sampleip: Replace PAGE_OFFSET with _text address

2023-04-14T04:57:11+00:00

Macro PAGE_OFFSET(0xffff880000000000) in sampleip_user.c is inaccurate, for example, in aarch64 architecture, this value depends on the CONFIG_ARM64_VA_BITS compilation configuration, this value defaults to 48, the corresponding PAGE_OFFSET is 0xffff800000000000, if we use the value defined in sampleip_user.c, then all KSYMs obtained by sampleip are (user) Symbol error due to PAGE_OFFSET error: $ sudo ./sampleip 1 Sampling at 99 Hertz for 1 seconds. Ctrl-C also ends. ADDR KSYM COUNT 0xffff80000810ceb8 (user) 1 0xffffb28ec880 (user) 1 0xffff8000080c82b8 (user) 1 0xffffb23fed24 (user) 1 0xffffb28944fc (user) 1 0xffff8000084628bc (user) 1 0xffffb2a935c0 (user) 1 0xffff80000844677c (user) 1 0xffff80000857a3a4 (user) 1 ... A few examples of addresses in the CONFIG_ARM64_VA_BITS=48 environment in the aarch64 environment: $ sudo head /proc/kallsyms ffff8000080a0000 T _text ffff8000080b0000 t gic_handle_irq ffff8000080b0000 T _stext ffff8000080b0000 T __irqentry_text_start ffff8000080b00b0 t gic_handle_irq ffff8000080b0230 t gic_handle_irq ffff8000080b03b4 T __irqentry_text_end ffff8000080b03b8 T __softirqentry_text_start ffff8000080b03c0 T __do_softirq ffff8000080b0718 T __entry_text_start We just need to replace the PAGE_OFFSET with the address _text in /proc/kallsyms to solve this problem: $ sudo ./sampleip 1 Sampling at 99 Hertz for 1 seconds. Ctrl-C also ends. ADDR KSYM COUNT 0xffffb2892ab0 (user) 1 0xffffb2b1edfc (user) 1 0xffff800008462834 __arm64_sys_ppoll 1 0xffff8000084b87f4 eventfd_read 1 0xffffb28e6788 (user) 1 0xffff8000081e96d8 rcu_all_qs 1 0xffffb2ada878 (user) 1 ... Signed-off-by: Rong Tao Link: https://lore.kernel.org/r/tencent_A0E82E0BEE925285F8156D540731DF805F05@qq.com Signed-off-by: Alexei Starovoitov

samples, bpf: Refactor pointer error check with libbpf

2020-05-19T15:12:49+00:00

Current method of checking pointer error is not user friendly. Especially the __must_check define makes this less intuitive. Since, libbpf has an API libbpf_get_error() which checks pointer error, this commit refactors existing pointer error check logic with libbpf. Signed-off-by: Daniel T. Lee Signed-off-by: Daniel Borkmann Acked-by: Yonghong Song Link: https://lore.kernel.org/bpf/20200516040608.1377876-2-danieltimlee@gmail.com

samples, bpf: Refactor perf_event user program with libbpf bpf_link

2020-03-23T21:27:57+00:00

The bpf_program__attach of libbpf(using bpf_link) is much more intuitive than the previous method using ioctl. bpf_program__attach_perf_event manages the enable of perf_event and attach of BPF programs to it, so there's no neeed to do this directly with ioctl. In addition, bpf_link provides consistency in the use of API because it allows disable (detach, destroy) for multiple events to be treated as one bpf_link__destroy. Also, bpf_link__destroy manages the close() of perf_event fd. This commit refactors samples that attach the bpf program to perf_event by using libbbpf instead of ioctl. Also the bpf_load in the samples were removed and migrated to use libbbpf API. Signed-off-by: Daniel T. Lee Signed-off-by: Daniel Borkmann Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20200321100424.1593964-3-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

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206

2019-05-30T18:29:53+00:00

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of version 2 of the gnu general public license as published by the free software foundation extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 107 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Reviewed-by: Richard Fontana Reviewed-by: Steve Winslow Reviewed-by: Alexios Zavras Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528171438.615055994@linutronix.de Signed-off-by: Greg Kroah-Hartman

samples, selftests/bpf: add NULL check for ksym_search

2019-04-04T14:43:47+00:00

Since, ksym_search added with verification logic for symbols existence, it could return NULL when the kernel symbols are not loaded. This commit will add NULL check logic after ksym_search. Signed-off-by: Daniel T. Lee Signed-off-by: Daniel Borkmann

samples/bpf: remove duplicated includes

2018-09-18T15:49:33+00:00

Remove duplicated includes. Signed-off-by: YueHaibing Acked-by: Yonghong Song Signed-off-by: Daniel Borkmann

samples/bpf: move common-purpose trace functions to selftests

2018-04-29T15:45:54+00:00

There is no functionality change in this patch. The common-purpose trace functions, including perf_event polling and ksym lookup, are moved from trace_output_user.c and bpf_load.c to selftests/bpf/trace_helpers.c so that these function can be reused later in selftests. Acked-by: Alexei Starovoitov Signed-off-by: Yonghong Song Signed-off-by: Alexei Starovoitov

samples/bpf: run cleanup routines when receiving SIGTERM

2017-05-12T01:43:30+00:00

Shahid Habib noticed that when xdp1 was killed from a different console the xdp program was not cleaned-up properly in the kernel and it continued to forward traffic. Most of the applications in samples/bpf cleanup properly, but only when getting SIGINT. Since kill defaults to using SIGTERM, add support to cleanup when the application receives either SIGINT or SIGTERM. Signed-off-by: Andy Gospodarek Reported-by: Shahid Habib Acked-by: Alexei Starovoitov Acked-by: Daniel Borkmann Signed-off-by: David S. Miller

samples/bpf: Remove perf_event_open() declaration

2016-12-20T15:00:40+00:00

This declaration was made in samples/bpf/libbpf.c for convenience, but there's already one in tools/perf/perf-sys.h. Reuse that one. Committer notes: Testing it: $ make -j4 O=../build/v4.9.0-rc8+ samples/bpf/ make[1]: Entering directory '/home/build/v4.9.0-rc8+' CHK include/config/kernel.release GEN ./Makefile CHK include/generated/uapi/linux/version.h Using /home/acme/git/linux as source for kernel CHK include/generated/utsrelease.h CHK include/generated/timeconst.h CHK include/generated/bounds.h CHK include/generated/asm-offsets.h CALL /home/acme/git/linux/scripts/checksyscalls.sh HOSTCC samples/bpf/test_verifier.o HOSTCC samples/bpf/libbpf.o HOSTCC samples/bpf/../../tools/lib/bpf/bpf.o HOSTCC samples/bpf/test_maps.o HOSTCC samples/bpf/sock_example.o HOSTCC samples/bpf/bpf_load.o HOSTLD samples/bpf/trace_event HOSTLD samples/bpf/sampleip HOSTLD samples/bpf/tc_l2_redirect make[1]: Leaving directory '/home/build/v4.9.0-rc8+' $ Also tested the offwaketime resulting from the rebuild, seems to work as before. Signed-off-by: Joe Stringer Tested-by: Arnaldo Carvalho de Melo Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: Wang Nan Link: http://lkml.kernel.org/r/20161209024620.31660-7-joe@ovn.org [ Use -I$(srctree)/tools/lib/ to support out of source code tree builds ] Signed-off-by: Arnaldo Carvalho de Melo