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8fa42d78f6
When running xdpsock for a fix duration of time before terminating
using --duration=<n>, 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:
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.. | ||
.gitignore | ||
asm_goto_workaround.h | ||
bpf_insn.h | ||
cookie_uid_helper_example.c | ||
cpustat_kern.c | ||
cpustat_user.c | ||
do_hbm_test.sh | ||
fds_example.c | ||
hash_func01.h | ||
hbm_edt_kern.c | ||
hbm_kern.h | ||
hbm_out_kern.c | ||
hbm.c | ||
hbm.h | ||
ibumad_kern.c | ||
ibumad_user.c | ||
lathist_kern.c | ||
lathist_user.c | ||
lwt_len_hist_kern.c | ||
lwt_len_hist_user.c | ||
lwt_len_hist.sh | ||
Makefile | ||
Makefile.target | ||
map_perf_test_kern.c | ||
map_perf_test_user.c | ||
offwaketime_kern.c | ||
offwaketime_user.c | ||
parse_ldabs.c | ||
parse_simple.c | ||
parse_varlen.c | ||
README.rst | ||
run_cookie_uid_helper_example.sh | ||
sampleip_kern.c | ||
sampleip_user.c | ||
sock_example.c | ||
sock_example.h | ||
sock_flags_kern.c | ||
sockex1_kern.c | ||
sockex1_user.c | ||
sockex2_kern.c | ||
sockex2_user.c | ||
sockex3_kern.c | ||
sockex3_user.c | ||
spintest_kern.c | ||
spintest_user.c | ||
syscall_nrs.c | ||
syscall_tp_kern.c | ||
syscall_tp_user.c | ||
task_fd_query_kern.c | ||
task_fd_query_user.c | ||
tc_l2_redirect_kern.c | ||
tc_l2_redirect_user.c | ||
tc_l2_redirect.sh | ||
tcbpf1_kern.c | ||
tcp_basertt_kern.c | ||
tcp_bpf.readme | ||
tcp_bufs_kern.c | ||
tcp_clamp_kern.c | ||
tcp_cong_kern.c | ||
tcp_dumpstats_kern.c | ||
tcp_iw_kern.c | ||
tcp_rwnd_kern.c | ||
tcp_synrto_kern.c | ||
tcp_tos_reflect_kern.c | ||
test_cgrp2_array_pin.c | ||
test_cgrp2_attach.c | ||
test_cgrp2_sock2.c | ||
test_cgrp2_sock2.sh | ||
test_cgrp2_sock.c | ||
test_cgrp2_sock.sh | ||
test_cgrp2_tc_kern.c | ||
test_cgrp2_tc.sh | ||
test_cls_bpf.sh | ||
test_current_task_under_cgroup_kern.c | ||
test_current_task_under_cgroup_user.c | ||
test_lru_dist.c | ||
test_lwt_bpf.c | ||
test_lwt_bpf.sh | ||
test_map_in_map_kern.c | ||
test_map_in_map_user.c | ||
test_overhead_kprobe_kern.c | ||
test_overhead_raw_tp_kern.c | ||
test_overhead_tp_kern.c | ||
test_overhead_user.c | ||
test_override_return.sh | ||
test_probe_write_user_kern.c | ||
test_probe_write_user_user.c | ||
trace_common.h | ||
trace_event_kern.c | ||
trace_event_user.c | ||
trace_output_kern.c | ||
trace_output_user.c | ||
tracex1_kern.c | ||
tracex1_user.c | ||
tracex2_kern.c | ||
tracex2_user.c | ||
tracex3_kern.c | ||
tracex3_user.c | ||
tracex4_kern.c | ||
tracex4_user.c | ||
tracex5_kern.c | ||
tracex5_user.c | ||
tracex6_kern.c | ||
tracex6_user.c | ||
tracex7_kern.c | ||
tracex7_user.c | ||
xdp1_kern.c | ||
xdp1_user.c | ||
xdp2_kern.c | ||
xdp2skb_meta_kern.c | ||
xdp2skb_meta.sh | ||
xdp_adjust_tail_kern.c | ||
xdp_adjust_tail_user.c | ||
xdp_fwd_kern.c | ||
xdp_fwd_user.c | ||
xdp_monitor_user.c | ||
xdp_monitor.bpf.c | ||
xdp_redirect_cpu_user.c | ||
xdp_redirect_cpu.bpf.c | ||
xdp_redirect_map_multi_user.c | ||
xdp_redirect_map_multi.bpf.c | ||
xdp_redirect_map_user.c | ||
xdp_redirect_map.bpf.c | ||
xdp_redirect_user.c | ||
xdp_redirect.bpf.c | ||
xdp_router_ipv4_kern.c | ||
xdp_router_ipv4_user.c | ||
xdp_rxq_info_kern.c | ||
xdp_rxq_info_user.c | ||
xdp_sample_pkts_kern.c | ||
xdp_sample_pkts_user.c | ||
xdp_sample_shared.h | ||
xdp_sample_user.c | ||
xdp_sample_user.h | ||
xdp_sample.bpf.c | ||
xdp_sample.bpf.h | ||
xdp_tx_iptunnel_common.h | ||
xdp_tx_iptunnel_kern.c | ||
xdp_tx_iptunnel_user.c | ||
xdpsock_ctrl_proc.c | ||
xdpsock_kern.c | ||
xdpsock_user.c | ||
xdpsock.h | ||
xsk_fwd.c |
eBPF sample programs ==================== This directory contains a test stubs, verifier test-suite and examples for using eBPF. The examples use libbpf from tools/lib/bpf. Build dependencies ================== Compiling requires having installed: * clang >= version 3.4.0 * llvm >= version 3.7.1 Note that LLVM's tool 'llc' must support target 'bpf', list version and supported targets with command: ``llc --version`` Clean and configuration ----------------------- It can be needed to clean tools, samples or kernel before trying new arch or after some changes (on demand):: make -C tools clean make -C samples/bpf clean make clean Configure kernel, defconfig for instance:: make defconfig Kernel headers -------------- There are usually dependencies to header files of the current kernel. To avoid installing devel kernel headers system wide, as a normal user, simply call:: make headers_install This will creates a local "usr/include" directory in the git/build top level directory, that the make system automatically pickup first. Compiling ========= For building the BPF samples, issue the below command from the kernel top level directory:: make M=samples/bpf It is also possible to call make from this directory. This will just hide the invocation of make as above. Manually compiling LLVM with 'bpf' support ------------------------------------------ Since version 3.7.0, LLVM adds a proper LLVM backend target for the BPF bytecode architecture. By default llvm will build all non-experimental backends including bpf. To generate a smaller llc binary one can use:: -DLLVM_TARGETS_TO_BUILD="BPF" We recommend that developers who want the fastest incremental builds use the Ninja build system, you can find it in your system's package manager, usually the package is ninja or ninja-build. Quick sniplet for manually compiling LLVM and clang (build dependencies are ninja, cmake and gcc-c++):: $ git clone https://github.com/llvm/llvm-project.git $ mkdir -p llvm-project/llvm/build $ cd llvm-project/llvm/build $ cmake .. -G "Ninja" -DLLVM_TARGETS_TO_BUILD="BPF;X86" \ -DLLVM_ENABLE_PROJECTS="clang" \ -DCMAKE_BUILD_TYPE=Release \ -DLLVM_BUILD_RUNTIME=OFF $ ninja It is also possible to point make to the newly compiled 'llc' or 'clang' command via redefining LLC or CLANG on the make command line:: make M=samples/bpf LLC=~/git/llvm-project/llvm/build/bin/llc CLANG=~/git/llvm-project/llvm/build/bin/clang Cross compiling samples ----------------------- In order to cross-compile, say for arm64 targets, export CROSS_COMPILE and ARCH environment variables before calling make. But do this before clean, cofiguration and header install steps described above. This will direct make to build samples for the cross target:: export ARCH=arm64 export CROSS_COMPILE="aarch64-linux-gnu-" Headers can be also installed on RFS of target board if need to keep them in sync (not necessarily and it creates a local "usr/include" directory also):: make INSTALL_HDR_PATH=~/some_sysroot/usr headers_install Pointing LLC and CLANG is not necessarily if it's installed on HOST and have in its targets appropriate arm64 arch (usually it has several arches). Build samples:: make M=samples/bpf Or build samples with SYSROOT if some header or library is absent in toolchain, say libelf, providing address to file system containing headers and libs, can be RFS of target board:: make M=samples/bpf SYSROOT=~/some_sysroot