linux-dev/samples/bpf, branch linus/master

samples: bpf: Don't fail for a missing VMLINUX_BTF when VMLINUX_H is provided

2022-05-10T00:40:43Z

samples/bpf build currently always fails if it can't generate vmlinux.h from vmlinux, even when vmlinux.h is directly provided by VMLINUX_H variable, which makes VMLINUX_H pointless. Only fails when neither method works. Fixes: 384b6b3bbf0d ("samples: bpf: Add vmlinux.h generation support") Reported-by: CKI Project Reported-by: Veronika Kabatova Signed-off-by: Jerome Marchand Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20220507161635.2219052-1-jmarchan@redhat.com

samples/bpf: Detach xdp prog when program exits unexpectedly in xdp_rxq_info_user

2022-04-28T02:07:42Z

When xdp_rxq_info_user program exits unexpectedly, it doesn't detach xdp prog of device, and other xdp prog can't be attached to the device. So call init_exit() to detach xdp prog when program exits unexpectedly. Signed-off-by: Zhengchao Shao Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20220427062338.80173-1-shaozhengchao@huawei.com

samples/bpf: Reduce the sampling interval in xdp1_user

2022-04-20T21:58:29Z

If interval is 2, and sum - prev[key] = 1, the result = 0. This will mislead the tester that the port has no traffic right now. So reduce the sampling interval to 1. Signed-off-by: Zhengchao Shao Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20220419114746.291613-1-shaozhengchao@huawei.com

samples/bpf: Use libbpf 1.0 API mode instead of RLIMIT_MEMLOCK

2022-04-11T03:17:15Z

We have switched to memcg-based memory accouting and thus the rlimit is not needed any more. LIBBPF_STRICT_AUTO_RLIMIT_MEMLOCK was introduced in libbpf for backward compatibility, so we can use it instead now. This patch also removes the useless header sys/resource.h from many files in samples/bpf. Signed-off-by: Yafang Shao Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20220409125958.92629-2-laoar.shao@gmail.com

samples, bpf: Move routes monitor in xdp_router_ipv4 in a dedicated thread

2022-04-08T20:10:57Z

In order to not miss any netlink message from the kernel, move routes monitor to a dedicated thread. Fixes: 85bf1f51691c ("samples: bpf: Convert xdp_router_ipv4 to XDP samples helper") Signed-off-by: Lorenzo Bianconi Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/e364b817c69ded73be24b677ab47a157f7c21b64.1649167911.git.lorenzo@kernel.org

samples: bpf: Fix linking xdp_router_ipv4 after migration

2022-04-04T21:45:06Z

Users of the xdp_sample_user infra should be explicitly linked with the standard math library (`-lm`). Otherwise, the following happens: /usr/bin/ld: xdp_sample_user.c:(.text+0x59fc): undefined reference to `ceil' /usr/bin/ld: xdp_sample_user.c:(.text+0x5a0d): undefined reference to `ceil' /usr/bin/ld: xdp_sample_user.c:(.text+0x5adc): undefined reference to `floor' /usr/bin/ld: xdp_sample_user.c:(.text+0x5b01): undefined reference to `ceil' /usr/bin/ld: xdp_sample_user.c:(.text+0x5c1e): undefined reference to `floor' /usr/bin/ld: xdp_sample_user.c:(.text+0x5c43): undefined reference to `ceil [...] That happened previously, so there's a block of linkage flags in the Makefile. xdp_router_ipv4 has been transferred to this infra quite recently, but hasn't been added to it. Fix. Fixes: 85bf1f51691c ("samples: bpf: Convert xdp_router_ipv4 to XDP samples helper") Signed-off-by: Alexander Lobakin Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20220404115451.1116478-1-alexandr.lobakin@intel.com

sample: bpf: syscall_tp_user: Print result of verify_map

2022-04-04T21:43:57Z

At the end of the test, we already print out prog : map ids <...> <...> Value is the number read from kernel through bpf map, further print out verify map: val:<...> will help users to understand the program runs successfully. Signed-off-by: Song Chen Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/1648889828-12417-1-git-send-email-chensong_2000@189.cn

samples: bpf: Convert xdp_router_ipv4 to XDP samples helper

2022-04-04T00:12:09Z

Rely on the libbpf skeleton facility and other utilities provided by XDP sample helpers in xdp_router_ipv4 sample. Signed-off-by: Lorenzo Bianconi Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/7f4d98ee2c13c04d5eb924eebf79ced32fee8418.1647414711.git.lorenzo@kernel.org

samples/bpf, xdpsock: Fix race when running for fix duration of time

2022-03-15T15:53:37Z

When running xdpsock for a fix duration of time before terminating using --duration=, there is a race condition that may cause xdpsock to terminate immediately. When running for a fixed duration of time the check to determine when to terminate execution is in is_benchmark_done() and is being executed in the context of the poller thread, if (opt_duration > 0) { unsigned long dt = (get_nsecs() - start_time); if (dt >= opt_duration) benchmark_done = true; } However start_time is only set after the poller thread have been created. This leaves a small window when the poller thread is starting and calls is_benchmark_done() for the first time that start_time is not yet set. In that case start_time have its initial value of 0 and the duration check fails as it do not correlate correctly for the applications start time and immediately sets benchmark_done which in turn terminates the xdpsock application. Fix this by setting start_time before creating the poller thread. Fixes: d3f11b018f6c ("samples/bpf: xdpsock: Add duration option to specify how long to run") Signed-off-by: Niklas Söderlund Signed-off-by: Simon Horman Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20220315102948.466436-1-niklas.soderlund@corigine.com

samples/bpf: Get rid of bpf_prog_load_xattr() use

2022-02-03T15:32:25Z

Remove all the remaining uses of deprecated bpf_prog_load_xattr() API. Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann Reviewed-by: Quentin Monnet Link: https://lore.kernel.org/bpf/20220202225916.3313522-7-andrii@kernel.org