linux.git/tools/testing/selftests/bpf/Makefile, branch v6.7

selftests/bpf: Add netlink helper library

2023-10-24T23:07:39+00:00

Add a minimal netlink helper library for the BPF selftests. This has been
taken and cut down and cleaned up from iproute2. This covers basics such
as netdevice creation which we need for BPF selftests / BPF CI given
iproute2 package cannot cover it yet.

Stanislav Fomichev suggested that this could be replaced in future by ynl
tool generated C code once it has RTNL support to create devices. Once we
get to this point the BPF CI would also need to add libmnl. If no further
extensions are needed, a second option could be that we remove this code
again once iproute2 package has support.

Signed-off-by: Daniel Borkmann 
Acked-by: Martin KaFai Lau 
Link: https://lore.kernel.org/r/20231024214904.29825-7-daniel@iogearbox.net
Signed-off-by: Martin KaFai Lau

selftests/bpf: Support building selftests in optimized -O2 mode

2023-10-06T18:17:28+00:00

Add support for building selftests with -O2 level of optimization, which
allows more compiler warnings detection (like lots of potentially
uninitialized usage), but also is useful to have a faster-running test
for some CPU-intensive tests.

One can build optimized versions of libbpf and selftests by running:

  $ make RELEASE=1

There is a measurable speed up of about 10 seconds for me locally,
though it's mostly capped by non-parallelized serial tests. User CPU
time goes down by total 40 seconds, from 1m10s to 0m28s.

Unoptimized build (-O0)
=======================
Summary: 430/3544 PASSED, 25 SKIPPED, 4 FAILED

real    1m59.937s
user    1m10.877s
sys     3m14.880s

Optimized build (-O2)
=====================
Summary: 425/3543 PASSED, 25 SKIPPED, 9 FAILED

real    1m50.540s
user    0m28.406s
sys     3m13.198s

Signed-off-by: Andrii Nakryiko 
Signed-off-by: Daniel Borkmann 
Reviewed-by: Alan Maguire 
Acked-by: Jiri Olsa 
Link: https://lore.kernel.org/bpf/20231006175744.3136675-2-andrii@kernel.org

selftests/bpf: Fix compiler warnings reported in -O2 mode

2023-10-06T18:17:28+00:00

Fix a bunch of potentially unitialized variable usage warnings that are
reported by GCC in -O2 mode. Also silence overzealous stringop-truncation
class of warnings.

Signed-off-by: Andrii Nakryiko 
Signed-off-by: Daniel Borkmann 
Acked-by: Jiri Olsa 
Link: https://lore.kernel.org/bpf/20231006175744.3136675-1-andrii@kernel.org

selftests/bpf: Add uprobe_multi to gen_tar target

2023-10-04T20:37:41+00:00

The uprobe_multi program was not picked up for the gen_tar target. Fix
by adding it to TEST_GEN_FILES.

Signed-off-by: Björn Töpel 
Signed-off-by: Andrii Nakryiko 
Acked-by: Jiri Olsa 
Link: https://lore.kernel.org/bpf/20231004122721.54525-4-bjorn@kernel.org

selftests/bpf: Enable lld usage for RISC-V

2023-10-04T20:37:41+00:00

RISC-V has proper lld support. Use that, similar to what x86 does, for
urandom_read et al.

Signed-off-by: Björn Töpel 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20231004122721.54525-3-bjorn@kernel.org

selftests/bpf: Add cross-build support for urandom_read et al

2023-10-04T20:36:50+00:00

Some userland programs in the BPF test suite, e.g. urandom_read, is
missing cross-build support. Add cross-build support for these
programs

Signed-off-by: Björn Töpel 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20231004122721.54525-2-bjorn@kernel.org

selftests/xsk: Iterate over all the sockets in the receive pkts function

2023-10-04T13:26:02+00:00

Improve the receive_pkt() function to enable it to receive packets from
multiple sockets. Define a sock_num variable to iterate through all the
sockets in the Rx path. Add nb_valid_entries to check that all the
expected number of packets are received.

Revise the function __receive_pkts() to only inspect the receive ring
once, handle any received packets, and promptly return. Implement a bitmap
to store the value of number of sockets. Update Makefile to include
find_bit.c for compiling xskxceiver.

Signed-off-by: Tushar Vyavahare 
Signed-off-by: Daniel Borkmann 
Acked-by: Magnus Karlsson 
Link: https://lore.kernel.org/bpf/20230927135241.2287547-5-tushar.vyavahare@intel.com

selftests/bpf: Add tests for symbol versioning for uprobe

2023-09-22T21:27:41+00:00

This exercises the newly added dynsym symbol versioning logics.
Now we accept symbols in form of func, func@LIB_VERSION or
func@@LIB_VERSION.

The test rely on liburandom_read.so. For liburandom_read.so, we have:

    $ nm -D liburandom_read.so
                     w __cxa_finalize@GLIBC_2.17
                     w __gmon_start__
                     w _ITM_deregisterTMCloneTable
                     w _ITM_registerTMCloneTable
    0000000000000000 A LIBURANDOM_READ_1.0.0
    0000000000000000 A LIBURANDOM_READ_2.0.0
    000000000000081c T urandlib_api@@LIBURANDOM_READ_2.0.0
    0000000000000814 T urandlib_api@LIBURANDOM_READ_1.0.0
    0000000000000824 T urandlib_api_sameoffset@LIBURANDOM_READ_1.0.0
    0000000000000824 T urandlib_api_sameoffset@@LIBURANDOM_READ_2.0.0
    000000000000082c T urandlib_read_without_sema@@LIBURANDOM_READ_1.0.0
    00000000000007c4 T urandlib_read_with_sema@@LIBURANDOM_READ_1.0.0
    0000000000011018 D urandlib_read_with_sema_semaphore@@LIBURANDOM_READ_1.0.0

For `urandlib_api`, specifying `urandlib_api` will cause a conflict because
there are two symbols named urandlib_api and both are global bind.
For `urandlib_api_sameoffset`, there are also two symbols in the .so, but
both are at the same offset and essentially they refer to the same function
so no conflict.

Signed-off-by: Hengqi Chen 
Signed-off-by: Andrii Nakryiko 
Reviewed-by: Alan Maguire 
Acked-by: Jiri Olsa 
Link: https://lore.kernel.org/bpf/20230918024813.237475-4-hengqi.chen@gmail.com

selftests/bpf: Include build flavors for install target

2023-08-31T20:01:53+00:00

When using the "install" or targets depending on install, e.g. "gen_tar",
the BPF machine flavors weren't included.

A command like:
  | make ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- O=/workspace/kbuild \
  |    HOSTCC=gcc FORMAT= SKIP_TARGETS="arm64 ia64 powerpc sparc64 x86 sgx" \
  |    -C tools/testing/selftests gen_tar
would not include bpf/no_alu32, bpf/cpuv4, or bpf/bpf-gcc.

Include the BPF machine flavors for "install" make target.

Signed-off-by: Björn Töpel 
Signed-off-by: Daniel Borkmann 
Link: https://lore.kernel.org/bpf/20230831162954.111485-1-bjorn@kernel.org

selftests/bpf: Add uprobe_multi test program

2023-08-21T22:51:27+00:00

Adding uprobe_multi test program that defines 50k uprobe_multi_func_*
functions and will serve as attach point for uprobe_multi bench test
in following patch.

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20230809083440.3209381-23-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov