1. 12 Dec, 2017 4 commits
    • Alexei Starovoitov's avatar
      Merge branch 'bpf-tracing-multiprog-tp-query' · a23967c1
      Alexei Starovoitov authored
      Yonghong Song says:
      
      ====================
      Commit e87c6bc3 ("bpf: permit multiple bpf attachments
      for a single perf event") added support to attach multiple
      bpf programs to a single perf event. Given a perf event
      (kprobe, uprobe, or kernel tracepoint), the perf ioctl interface
      is used to query bpf programs attached to the same trace event.
      
      There already exists a BPF_PROG_QUERY command for introspection
      currently used by cgroup+bpf. We did have an implementation for
      querying tracepoint+bpf through the same interface. However, it
      looks cleaner to use ioctl() style of api here, since attaching
      bpf prog to tracepoint/kuprobe is also done via ioctl.
      
      Patch #1 had the core implementation and patch #2 added
      a test case in tools bpf selftests suite.
      
      Changelogs:
      v3 -> v4:
        - Fix a compilation error with newer gcc like 6.3.1 while
          old gcc 4.8.5 is okay. I was using &uquery->ids to represent
          the address to the ids array to make it explicit that the
          address is passed, and this syntax is rightly rejected
          by gcc 6.3.1.
      v2 -> v3:
        - Change uapi structure perf_event_query_bpf to be more
          clearer based on Peter's suggestion, and adjust
          other codes accordingly.
      v1 -> v2:
        - Rebase on top of net-next.
        - Use existing bpf_prog_array_length function instead of
          implementing the same functionality in function
          bpf_prog_array_copy_info.
      ====================
      Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
      a23967c1
    • Yonghong Song's avatar
      bpf/tracing: add a bpf test for new ioctl query interface · d279f1f8
      Yonghong Song authored
      Added a subtest in test_progs. The tracepoint is
      sched/sched_switch. Multiple bpf programs are attached to
      this tracepoint and the query interface is exercised.
      Signed-off-by: default avatarYonghong Song <yhs@fb.com>
      Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
      Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
      d279f1f8
    • Yonghong Song's avatar
      bpf/tracing: allow user space to query prog array on the same tp · f371b304
      Yonghong Song authored
      Commit e87c6bc3 ("bpf: permit multiple bpf attachments
      for a single perf event") added support to attach multiple
      bpf programs to a single perf event.
      Although this provides flexibility, users may want to know
      what other bpf programs attached to the same tp interface.
      Besides getting visibility for the underlying bpf system,
      such information may also help consolidate multiple bpf programs,
      understand potential performance issues due to a large array,
      and debug (e.g., one bpf program which overwrites return code
      may impact subsequent program results).
      
      Commit 2541517c ("tracing, perf: Implement BPF programs
      attached to kprobes") utilized the existing perf ioctl
      interface and added the command PERF_EVENT_IOC_SET_BPF
      to attach a bpf program to a tracepoint. This patch adds a new
      ioctl command, given a perf event fd, to query the bpf program
      array attached to the same perf tracepoint event.
      
      The new uapi ioctl command:
        PERF_EVENT_IOC_QUERY_BPF
      
      The new uapi/linux/perf_event.h structure:
        struct perf_event_query_bpf {
             __u32	ids_len;
             __u32	prog_cnt;
             __u32	ids[0];
        };
      
      User space provides buffer "ids" for kernel to copy to.
      When returning from the kernel, the number of available
      programs in the array is set in "prog_cnt".
      
      The usage:
        struct perf_event_query_bpf *query =
          malloc(sizeof(*query) + sizeof(u32) * ids_len);
        query.ids_len = ids_len;
        err = ioctl(pmu_efd, PERF_EVENT_IOC_QUERY_BPF, query);
        if (err == 0) {
          /* query.prog_cnt is the number of available progs,
           * number of progs in ids: (ids_len == 0) ? 0 : query.prog_cnt
           */
        } else if (errno == ENOSPC) {
          /* query.ids_len number of progs copied,
           * query.prog_cnt is the number of available progs
           */
        } else {
            /* other errors */
        }
      Signed-off-by: default avatarYonghong Song <yhs@fb.com>
      Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
      Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
      f371b304
    • Naresh Kamboju's avatar
      selftests: bpf: Adding config fragment CONFIG_CGROUP_BPF=y · 63060c39
      Naresh Kamboju authored
      CONFIG_CGROUP_BPF=y is required for test_dev_cgroup test case.
      Signed-off-by: default avatarNaresh Kamboju <naresh.kamboju@linaro.org>
      Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
      63060c39
  2. 08 Dec, 2017 5 commits
    • Daniel Borkmann's avatar
      Merge branch 'bpf-bpftool-makefile-cleanups' · 97c50589
      Daniel Borkmann authored
      Quentin Monnet says:
      
      ====================
      First patch of this series cleans up the two Makefiles (Makefile and
      Documentation/Makefile) and make their contents more consistent.
      
      The second one add "uninstall" and "doc-uninstall" targets, to remove
      files previously installed on the system with "install" and "doc-install"
      targets.
      ====================
      Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
      97c50589
    • Quentin Monnet's avatar
      tools: bpftool: create "uninstall", "doc-uninstall" make targets · d3244248
      Quentin Monnet authored
      Create two targets to remove executable and documentation that would
      have been previously installed with `make install` and `make
      doc-install`.
      
      Also create a "QUIET_UNINST" helper in tools/scripts/Makefile.include.
      
      Do not attempt to remove directories /usr/local/sbin and
      /usr/share/bash-completions/completions, even if they are empty, as
      those specific directories probably already existed on the system before
      we installed the program, and we do not wish to break other makefiles
      that might assume their existence. Do remvoe /usr/local/share/man/man8
      if empty however, as this directory does not seem to exist by default.
      Signed-off-by: default avatarQuentin Monnet <quentin.monnet@netronome.com>
      Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
      d3244248
    • Quentin Monnet's avatar
      tools: bpftool: harmonise Makefile and Documentation/Makefile · 658e85aa
      Quentin Monnet authored
      Several minor fixes and harmonisation items for Makefiles:
      
      * Use the same mechanism for verbose/non-verbose output in two files
        ("$(Q)"), for all commands.
      * Use calls to "QUIET_INSTALL" and equivalent in Makefile. In
        particular, use "call(descend, ...)" instead of "make -C" to run
        documentation targets.
      * Add a "doc-clean" target, aligned on "doc" and "doc-install".
      * Make "install" target in Makefile depend on "bpftool".
      * Remove condition on DESTDIR to initialise prefix in doc Makefile.
      * Remove modification of VPATH based on OUTPUT, it is unused.
      * Formatting: harmonise spaces around equal signs.
      * Make install path for man pages /usr/local/man instead of
        /usr/local/share/man (respects the Makefile conventions, and the
        latter is usually a symbolic link to the former anyway).
      * Do not erase prefix if set by user in bpftool Makefile.
      * Fix install target for bpftool: append DESTDIR to install path.
      Signed-off-by: default avatarQuentin Monnet <quentin.monnet@netronome.com>
      Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
      658e85aa
    • David S. Miller's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next · 62cd2770
      David S. Miller authored
      Alexei Starovoitov says:
      
      ====================
      pull-request: bpf-next 2017-12-07
      
      The following pull-request contains BPF updates for your net-next tree.
      
      The main changes are:
      
      1) Detailed documentation of BPF development process from Daniel.
      
      2) Addition of is_fullsock, snd_cwnd and srtt_us fields to bpf_sock_ops
         from Lawrence.
      
      3) Minor follow up for bpf_skb_set_tunnel_key() from William.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      62cd2770
    • Jason Wang's avatar
      tuntap: fix possible deadlock when fail to register netdev · 124da8f6
      Jason Wang authored
      Private destructor could be called when register_netdev() fail with
      rtnl lock held. This will lead deadlock in tun_free_netdev() who tries
      to hold rtnl_lock. Fixing this by switching to use spinlock to
      synchronize.
      
      Fixes: 96f84061 ("tun: add eBPF based queue selection method")
      Reported-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Cc: Eric Dumazet <eric.dumazet@gmail.com>
      Cc: Willem de Bruijn <willemb@google.com>
      Signed-off-by: default avatarJason Wang <jasowang@redhat.com>
      Acked-by: default avatarMichael S. Tsirkin <mst@redhat.com>
      Reviewed-by: default avatarEric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      124da8f6
  3. 07 Dec, 2017 9 commits
  4. 06 Dec, 2017 17 commits
  5. 05 Dec, 2017 5 commits