Changes in .gitignore

3e18f5f1 - selftests/bpf: Move test_lpm_map.c to map_tests

Fri, 06 Dec 2024 11:06:21 +0000

selftests/bpf: Move test_lpm_map.c to map_testsMove test_lpm_map.c to map_tests/ to include LPM trie test cases inregular test_maps run. Most code remains unchanged, including the use ofassert(). Only reduce n_lookups from 64K to 512, which decreasestest_lpm_map runtime from 37s to 0.7s.Signed-off-by: Hou Tao Link: https://lore.kernel.org/r/20241206110622.1161752-9-houtao@huaweicloud.comSigned-off-by: Alexei Starovoitov List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

63b37657 - selftests/bpf: remove test_flow_dissector.sh

Wed, 20 Nov 2024 07:43:24 +0000

selftests/bpf: remove test_flow_dissector.shNow that test_flow_dissector.sh has been converted to test_progs, removethe legacy test.Acked-by: Stanislav Fomichev Signed-off-by: Alexis Lothoré (eBPF Foundation) Link: https://lore.kernel.org/r/20241120-flow_dissector-v3-14-45b46494f937@bootlin.comSigned-off-by: Alexei Starovoitov List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

eea6c14c - selftests/bpf: Retire test_sock.c

Tue, 22 Oct 2024 15:29:04 +0000

selftests/bpf: Retire test_sock.cCompletely remove test_sock.c and associated config.Signed-off-by: Jordan Rife Link: https://lore.kernel.org/r/20241022152913.574836-5-jrife@google.comSigned-off-by: Martin KaFai Lau List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

c3566ee6 - selftests/bpf: remove test_tcp_check_syncookie

Sun, 20 Oct 2024 19:22:58 +0000

selftests/bpf: remove test_tcp_check_syncookieNow that btf_skc_cls_ingress has the same coverage astest_tcp_check_syncookie, remove the second one and keep the first oneas it is integrated in test_progsSigned-off-by: Alexis Lothoré (eBPF Foundation) Link: https://lore.kernel.org/r/20241020-syncookie-v2-6-2db240225fed@bootlin.comSigned-off-by: Martin KaFai Lau List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

b991fc52 - selftests/bpf: utility function to get program disassembly after jit

Tue, 20 Aug 2024 10:23:53 +0000

selftests/bpf: utility function to get program disassembly after jitThis commit adds a utility function to get disassembled text for jitedrepresentation of a BPF program designated by file descriptor.Function prototype looks as follows: int get_jited_program_text(int fd, char *text, size_t text_sz)Where 'fd' is a file descriptor for the program, 'text' and 'text_sz'refer to a destination buffer for disassembled text.Output format looks as follows: 18: 77 06 ja L0 1a: 50 pushq %rax 1b: 48 89 e0 movq %rsp, %rax 1e: eb 01 jmp L1 20: 50 L0: pushq %rax 21: 50 L1: pushq %rax ^ ^^^^^^^^ ^ ^^^^^^^^^^^^^^^^^^ | binary insn | textual insn | representation | representation | | instruction offset inferred local label nameThe code and makefile changes are inspired by jit_disasm.c from bpftool.Use llvm libraries to disassemble BPF program instead of libbfd to avoidissues with disassembly output stability pointed out in [1].Selftests makefile uses Makefile.feature to detect if LLVM librariesare available. If that is not the case selftests build proceeds butthe function returns -EOPNOTSUPP at runtime.[1] commit eb9d1acf634b ("bpftool: Add LLVM as default library for disassembling JIT-ed programs")Acked-by: Yonghong Song Signed-off-by: Eduard Zingerman Link: https://lore.kernel.org/r/20240820102357.3372779-6-eddyz87@gmail.comSigned-off-by: Alexei Starovoitov List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

f957c230 - selftests/bpf: convert test_skb_cgroup_id_user to test_progs

Tue, 13 Aug 2024 12:45:08 +0000

selftests/bpf: convert test_skb_cgroup_id_user to test_progstest_skb_cgroup_id_user allows testing skb cgroup id retrieval at differentlevels, but is not integrated in test_progs, so it is not runautomatically in CI. The test overlaps a bit withcgroup_skb_sk_lookup_kern, which is integrated in test_progs and testextensively skb cgroup helpers, but there is still one major differencebetween the two tests which justifies the conversion:cgroup_skb_sk_lookup_kern deals with a BPF_PROG_TYPE_CGROUP_SKB (attachedon a cgroup), while test_skb_cgroup_id_user deals with aBPF_PROG_TYPE_SCHED_CLS (attached on a qdisc)Convert test_skb_cgroup_id_user into test_progs framework in order to runit automatically in CI. The main differences with the original test are thefollowing:- rename the test to make it shorter and more straightforward regarding tested feature- the wrapping shell script has been dropped since every setup step is now handled in the main C test file- the test has been renamed for a shorter name and reflecting the tested API- add dedicated assert log per level to ease test failure debugging- use global variables instead of maps to access bpf prog dataSigned-off-by: Alexis Lothoré (eBPF Foundation) Link: https://lore.kernel.org/r/20240813-convert_cgroup_tests-v4-4-a33c03458cf6@bootlin.comSigned-off-by: Martin KaFai Lau List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

37a14cfd - selftests/bpf: convert test_cgroup_storage to test_progs

Tue, 13 Aug 2024 12:45:06 +0000

selftests/bpf: convert test_cgroup_storage to test_progstest_cgroup_storage is currently a standalone program which is not runwhen executing test_progs.Convert it to the test_progs framework so it can be automatically executedin CI. The conversion led to the following changes:- converted the raw bpf program in the userspace test file into a dedicated test program in progs/ dir- reduced the scope of cgroup_storage test: the content from this test overlaps with some other tests already present in test_progs, most notably netcnt and cgroup_storage_multi*. Those tests already check extensively local storage, per-cpu local storage, cgroups interaction, etc. So the new test only keep the part testing that the program return code (based on map content) properly leads to packet being passed or dropped.Reviewed-by: Alan Maguire Signed-off-by: Alexis Lothoré (eBPF Foundation) Link: https://lore.kernel.org/r/20240813-convert_cgroup_tests-v4-2-a33c03458cf6@bootlin.comSigned-off-by: Martin KaFai Lau List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

a4ae5c31 - selftests/bpf: convert get_current_cgroup_id_user to test_progs

Tue, 13 Aug 2024 12:45:05 +0000

selftests/bpf: convert get_current_cgroup_id_user to test_progsget_current_cgroup_id_user allows testing for bpf_get_current_cgroup_id()bpf API but is not integrated into test_progs, and so is not testedautomatically in CI.Convert it to the test_progs framework to allow running it automatically.The most notable differences with the old test are the following:- the new test relies on autoattach instead of manually hooking/enabling the targeted tracepoint through perf_event, which reduces quite a lot the test code size- it also accesses bpf prog data through global variables instead of maps- sleep duration passed to nanosleep syscall has been reduced to its minimum to not impact overall CI duration (we only care about the syscall being properly triggered, not about the passed duration)Signed-off-by: Alexis Lothoré (eBPF Foundation) Link: https://lore.kernel.org/r/20240813-convert_cgroup_tests-v4-1-a33c03458cf6@bootlin.comSigned-off-by: Martin KaFai Lau List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

d83d8230 - selftests/bpf: convert test_dev_cgroup to test_progs

Wed, 31 Jul 2024 06:37:26 +0000

selftests/bpf: convert test_dev_cgroup to test_progstest_dev_cgroup is defined as a standalone test program, and so is notexecuted in CI.Convert it to test_progs framework so it is tested automatically in CI, andremove the old test. In order to be able to run it in test_progs, /dev/nullmust remain usable, so change the new test to test operations on devices1:3 as valid, and operations on devices 1:5 (/dev/zero) as invalid.Reviewed-by: Alan Maguire Acked-by: Stanislav Fomichev Signed-off-by: Alexis Lothoré (eBPF Foundation) Link: https://lore.kernel.org/r/20240731-convert_dev_cgroup-v4-2-849425d90de6@bootlin.comSigned-off-by: Martin KaFai Lau List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

844f7315 - selftests/bpf: Use auto-dependencies for test objects

Thu, 18 Jul 2024 22:57:43 +0000

selftests/bpf: Use auto-dependencies for test objectsMake use of -M compiler options when building .test.o objects togenerate .d files and avoid re-building all tests every time.Previously, if a single test bpf program under selftests/bpf/progs/*.chas changed, make would rebuild all the *.bpf.o, *.skel.h and *.test.oobjects, which is a lot of unnecessary work.A typical dependency chain is:progs/x.c -> x.bpf.o -> x.skel.h -> x.test.o -> trunner_binaryHowever for many tests it's not a 1:1 mapping by name, and so far%.test.o have been simply dependent on all %.skel.h files, and%.skel.h files on all %.bpf.o objects.Avoid full rebuilds by instructing the compiler (via -MMD) toproduce *.d files with real dependencies, and appropriately includingthem. Exploit make feature that rebuilds included makefiles if theywere changed by setting %.test.d as prerequisite for %.test.o files.A couple of examples of compilation time speedup (after the firstclean build):$ touch progs/verifier_and.c && time make -j8Before: real 0m16.651sAfter: real 0m2.245s$ touch progs/read_vsyscall.c && time make -j8Before: real 0m15.743sAfter: real 0m1.575sA drawback of this change is that now there is an overhead due to makeprocessing lots of .d files, which potentially may slow down unrelatedtargets. However a time to make all from scratch hasn't changedsignificantly:$ make clean && time make -j8Before: real 1m31.148sAfter: real 1m30.309sSuggested-by: Eduard Zingerman Signed-off-by: Ihor Solodrai Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/VJihUTnvtwEgv_mOnpfy7EgD9D2MPNoHO-MlANeLIzLJPGhDeyOuGKIYyKgk0O6KPjfM-MuhtvPwZcngN8WFqbTnTRyCSMc2aMZ1ODm1T_g=@pm.me List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

61ecfdfc - selftests/bpf: Retire test_sock_addr.(c|sh)

Fri, 10 May 2024 19:02:30 +0000

selftests/bpf: Retire test_sock_addr.(c|sh)Fully remove test_sock_addr.c and test_sock_addr.sh, as test coveragehas been fully moved to prog_tests/sock_addr.c.Signed-off-by: Jordan Rife Link: https://lore.kernel.org/r/20240510190246.3247730-14-jrife@google.comSigned-off-by: Alexei Starovoitov List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

a182e641 - selftests/bpf: add uprobe_multi test binary to .gitignore

Thu, 24 Aug 2023 00:00:15 +0000

selftests/bpf: add uprobe_multi test binary to .gitignoreIt seems like it was forgotten to add uprobe_multi binary to .gitignore.Fix this trivial omission.Signed-off-by: Andrii Nakryiko Acked-by: Yonghong Song Link: https://lore.kernel.org/r/20230824000016.2658017-1-andrii@kernel.orgSigned-off-by: Martin KaFai Lau List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

a5d0c26a - selftests/bpf: Add a cpuv4 test runner for cpu=v4 testing

Fri, 28 Jul 2023 01:12:50 +0000

selftests/bpf: Add a cpuv4 test runner for cpu=v4 testingSimilar to no-alu32 runner, if clang compiler supports -mcpu=v4,a cpuv4 runner is created to test bpf programs compiled with-mcpu=v4.The following are some num-of-insn statistics for each newerinstructions based on existing selftests, excluding subsequentcpuv4 insn specific tests. insn pattern # of instructions reg = (s8)reg 4 reg = (s16)reg 4 reg = (s32)reg 144 reg = *(s8 *)(reg + off) 13 reg = *(s16 *)(reg + off) 14 reg = *(s32 *)(reg + off) 15215 reg = bswap16 reg 142 reg = bswap32 reg 38 reg = bswap64 reg 14 reg s/= reg 0 reg s%= reg 0 gotol 58Note that in llvm -mcpu=v4 implementation, the compiler is a littlebit conservative about generating 'gotol' insn (32-bit branch offset)as it didn't precise count the number of insns (e.g., some insns aredebug insns, etc.). Compared to old 'goto' insn, newer 'gotol' insnshould have comparable verification states to 'goto' insn.With current patch set, all selftests passed with -mcpu=v4when running test_progs-cpuv4 binary. The -mcpu=v3 and -mcpu=v2 runare also successful.Signed-off-by: Yonghong Song Link: https://lore.kernel.org/r/20230728011250.3718252-1-yonghong.song@linux.devSigned-off-by: Alexei Starovoitov List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

4dba3e78 - selftests/bpf: introduce XDP compliance test tool

Wed, 01 Feb 2023 10:24:24 +0000

selftests/bpf: introduce XDP compliance test toolIntroduce xdp_features tool in order to test XDP features supported bythe NIC and match them against advertised ones.In order to test supported/advertised XDP features, xdp_features mustrun on the Device Under Test (DUT) and on a Tester device.xdp_features opens a control TCP channel between DUT and Tester devicesto send control commands from Tester to the DUT and a UDP data channelwhere the Tester sends UDP 'echo' packets and the DUT is expected toreply back with the same packet. DUT installs multiple XDP programs on theNIC to test XDP capabilities and reports back to the Tester some XDP stats.Currently xdp_features supports the following XDP features:- XDP_DROP- XDP_ABORTED- XDP_PASS- XDP_TX- XDP_REDIRECT- XDP_NDO_XMITCo-developed-by: Kumar Kartikeya Dwivedi Signed-off-by: Kumar Kartikeya Dwivedi Signed-off-by: Lorenzo Bianconi Acked-by: Stanislav Fomichev Link: https://lore.kernel.org/r/7c1af8e7e6ef0614cf32fa9e6bdaa2d8d605f859.1675245258.git.lorenzo@kernel.orgSigned-off-by: Alexei Starovoitov List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

297a3f12 - selftests/bpf: Simple program to dump XDP RX metadata

Thu, 19 Jan 2023 22:15:36 +0000

selftests/bpf: Simple program to dump XDP RX metadataTo be used for verification of driver implementations. Note thatthe skb path is gone from the series, but I'm still keeping theimplementation for any possible future work.$ xdp_hw_metadata On the other machine:$ echo -n xdp | nc -u -q1 9091 # for AF_XDP$ echo -n skb | nc -u -q1 9092 # for skbSample output: # xdp xsk_ring_cons__peek: 1 0x19f9090: rx_desc[0]->addr=100000000008000 addr=8100 comp_addr=8000 rx_timestamp_supported: 1 rx_timestamp: 1667850075063948829 0x19f9090: complete idx=8 addr=8000 # skb found skb hwtstamp = 1668314052.854274681Decoding: # xdp rx_timestamp=1667850075.063948829 $ date -d @1667850075 Mon Nov 7 11:41:15 AM PST 2022 $ date Mon Nov 7 11:42:05 AM PST 2022 # skb $ date -d @1668314052 Sat Nov 12 08:34:12 PM PST 2022 $ date Sat Nov 12 08:37:06 PM PST 2022Cc: John Fastabend Cc: David Ahern Cc: Martin KaFai Lau Cc: Jakub Kicinski Cc: Willem de Bruijn Cc: Jesper Dangaard Brouer Cc: Anatoly Burakov Cc: Alexander Lobakin Cc: Magnus Karlsson Cc: Maryam Tahhan Cc: xdp-hints@xdp-project.netCc: netdev@vger.kernel.orgSigned-off-by: Stanislav Fomichev Link: https://lore.kernel.org/r/20230119221536.3349901-18-sdf@google.comSigned-off-by: Martin KaFai Lau List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

fcbb408a - selftests/bpf: Add host-tools to gitignore

Thu, 22 Dec 2022 21:39:58 +0000

selftests/bpf: Add host-tools to gitignoreShows up when cross-compiling:HOST_SCRATCH_DIR := $(OUTPUT)/host-toolsvsSCRATCH_DIR := $(OUTPUT)/toolsHOST_SCRATCH_DIR := $(SCRATCH_DIR)Reported-by: John Sperbeck Signed-off-by: Stanislav Fomichev Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20221222213958.2302320-1-sdf@google.com List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

067f4f29 - selftests/bpf: add sign-file to .gitignore

Fri, 23 Sep 2022 17:59:09 +0000

selftests/bpf: add sign-file to .gitignoreAdd sign-file to .gitignore to avoid accidentally checking it in.Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/r/20220923175913.3272430-2-andrii@kernel.orgSigned-off-by: Alexei Starovoitov List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

c8bc5e05 - selftests/bpf: Add veristat tool for mass-verifying BPF object files

Fri, 09 Sep 2022 19:30:53 +0000

selftests/bpf: Add veristat tool for mass-verifying BPF object filesAdd a small tool, veristat, that allows mass-verification ofa set of *libbpf-compatible* BPF ELF object files. For each such objectfile, veristat will attempt to verify each BPF program *individually*.Regardless of success or failure, it parses BPF verifier stats andoutputs them in human-readable table format. In the future we can alsoadd CSV and JSON output for more scriptable post-processing, if necessary.veristat allows to specify a set of stats that should be output andordering between multiple objects and files (e.g., so that one caneasily order by total instructions processed, instead of default filename, prog name, verdict, total instructions order).This tool should be useful for validating various BPF verifier changesor even validating different kernel versions for regressions.Here's an example for some of the heaviest selftests/bpf BPF objectfiles: $ sudo ./veristat -s insns,file,prog {pyperf,loop,test_verif_scale,strobemeta,test_cls_redirect,profiler}*.linked3.o File Program Verdict Duration, us Total insns Total states Peak states ------------------------------------ ------------------------------------ ------- ------------ ----------- ------------ ----------- loop3.linked3.o while_true failure 350990 1000001 9663 9663 test_verif_scale3.linked3.o balancer_ingress success 115244 845499 8636 2141 test_verif_scale2.linked3.o balancer_ingress success 77688 773445 3048 788 pyperf600.linked3.o on_event success 2079872 624585 30335 30241 pyperf600_nounroll.linked3.o on_event success 353972 568128 37101 2115 strobemeta.linked3.o on_event success 455230 557149 15915 13537 test_verif_scale1.linked3.o balancer_ingress success 89880 554754 8636 2141 strobemeta_nounroll2.linked3.o on_event success 433906 501725 17087 1912 loop6.linked3.o trace_virtqueue_add_sgs success 282205 398057 8717 919 loop1.linked3.o nested_loops success 125630 361349 5504 5504 pyperf180.linked3.o on_event success 2511740 160398 11470 11446 pyperf100.linked3.o on_event success 744329 87681 6213 6191 test_cls_redirect.linked3.o cls_redirect success 54087 78925 4782 903 strobemeta_subprogs.linked3.o on_event success 57898 65420 1954 403 test_cls_redirect_subprogs.linked3.o cls_redirect success 54522 64965 4619 958 strobemeta_nounroll1.linked3.o on_event success 43313 57240 1757 382 pyperf50.linked3.o on_event success 194355 46378 3263 3241 profiler2.linked3.o tracepoint__syscalls__sys_enter_kill success 23869 43372 1423 542 pyperf_subprogs.linked3.o on_event success 29179 36358 2499 2499 profiler1.linked3.o tracepoint__syscalls__sys_enter_kill success 13052 27036 1946 936 profiler3.linked3.o tracepoint__syscalls__sys_enter_kill success 21023 26016 2186 915 profiler2.linked3.o kprobe__vfs_link success 5255 13896 303 271 profiler1.linked3.o kprobe__vfs_link success 7792 12687 1042 1041 profiler3.linked3.o kprobe__vfs_link success 7332 10601 865 865 profiler2.linked3.o kprobe_ret__do_filp_open success 3417 8900 216 199 profiler2.linked3.o kprobe__vfs_symlink success 3548 8775 203 186 pyperf_global.linked3.o on_event success 10007 7563 520 520 profiler3.linked3.o kprobe_ret__do_filp_open success 4708 6464 532 532 profiler1.linked3.o kprobe_ret__do_filp_open success 3090 6445 508 508 profiler3.linked3.o kprobe__vfs_symlink success 4477 6358 521 521 profiler1.linked3.o kprobe__vfs_symlink success 3381 6347 507 507 profiler2.linked3.o raw_tracepoint__sched_process_exec success 2464 5874 292 189 profiler3.linked3.o raw_tracepoint__sched_process_exec success 2677 4363 397 283 profiler2.linked3.o kprobe__proc_sys_write success 1800 4355 143 138 profiler1.linked3.o raw_tracepoint__sched_process_exec success 1649 4019 333 240 pyperf600_bpf_loop.linked3.o on_event success 2711 3966 306 306 profiler2.linked3.o raw_tracepoint__sched_process_exit success 1234 3138 83 66 profiler3.linked3.o kprobe__proc_sys_write success 1755 2623 223 223 profiler1.linked3.o kprobe__proc_sys_write success 1222 2456 193 193 loop2.linked3.o while_true success 608 1783 57 30 profiler3.linked3.o raw_tracepoint__sched_process_exit success 789 1680 146 146 profiler1.linked3.o raw_tracepoint__sched_process_exit success 592 1526 133 133 strobemeta_bpf_loop.linked3.o on_event success 1015 1512 106 106 loop4.linked3.o combinations success 165 524 18 17 profiler3.linked3.o raw_tracepoint__sched_process_fork success 196 299 25 25 profiler1.linked3.o raw_tracepoint__sched_process_fork success 109 265 19 19 profiler2.linked3.o raw_tracepoint__sched_process_fork success 111 265 19 19 loop5.linked3.o while_true success 47 84 9 9 ------------------------------------ ------------------------------------ ------- ------------ ----------- ------------ -----------Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20220909193053.577111-4-andrii@kernel.org List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

018a8e75 - selftests, xsk: Rename AF_XDP testing app

Thu, 07 Jul 2022 11:16:12 +0000

selftests, xsk: Rename AF_XDP testing appRecently, xsk part of libbpf was moved to selftests/bpf directory andlives on its own because there is an AF_XDP testing application thatneeds it called xdpxceiver. That name makes it a bit hard to indicatewho maintains it as there are other XDP samples in there, whereas thisone is strictly about AF_XDP.Do s/xdpxceiver/xskxceiver so that it will be easier to figure out whomaintains it. A follow-up patch will correct MAINTAINERS file.Signed-off-by: Maciej Fijalkowski Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20220707111613.49031-2-maciej.fijalkowski@intel.com List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore

fb5cd0ce - selftests/bpf: Add selftests for raw syncookie helpers

Wed, 15 Jun 2022 13:48:45 +0000

selftests/bpf: Add selftests for raw syncookie helpersThis commit adds selftests for the new BPF helpers:bpf_tcp_raw_{gen,check}_syncookie_ipv{4,6}.xdp_synproxy_kern.c is a BPF program that generates SYN cookies onallowed TCP ports and sends SYNACKs to clients, accelerating synproxyiptables module.xdp_synproxy.c is a userspace control application that allows toconfigure the following options in runtime: list of allowed ports, MSS,window scale, TTL.A selftest is added to prog_tests that leverages the above programs totest the functionality of the new helpers.Signed-off-by: Maxim Mikityanskiy Reviewed-by: Tariq Toukan Link: https://lore.kernel.org/r/20220615134847.3753567-5-maximmi@nvidia.comSigned-off-by: Alexei Starovoitov List of files: /linux-6.15/tools/testing/selftests/bpf/.gitignore