leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
934,749 Commits 2 Branches 0 Tags
1f68f31b51507e1ad647aa3a43c295eb024490ad
Commit Graph

3 Commits

Author SHA1 Message Date
Andrii Nakryiko
9c82a63cf3 libbpf: Fix CO-RE relocs against .text section 
bpf_object__find_program_by_title(), used by CO-RE relocation code, doesn't
return .text "BPF program", if it is a function storage for sub-programs.
Because of that, any CO-RE relocation in helper non-inlined functions will
fail. Fix this by searching for .text-corresponding BPF program manually.

Adjust one of bpf_iter selftest to exhibit this pattern.

Fixes: ddc7c30426 ("libbpf: implement BPF CO-RE offset relocation algorithm")
Reported-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200619230423.691274-1-andriin@fb.com
 2020-06-23 17:01:43 -07:00
Andrii Nakryiko
b9f4c01f3e selftest/bpf: Make bpf_iter selftest compilable against old vmlinux.h 
It's good to be able to compile bpf_iter selftest even on systems that don't
have the very latest vmlinux.h, e.g., for libbpf tests against older kernels in
Travis CI. To that extent, re-define bpf_iter_meta and corresponding bpf_iter
context structs in each selftest. To avoid type clashes with vmlinux.h, rename
vmlinux.h's definitions to get them out of the way.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Link: https://lore.kernel.org/bpf/20200518234516.3915052-1-andriin@fb.com
 2020-05-19 11:41:49 -07:00
Yonghong Song
7c128a6bbd tools/bpf: selftests: Add iterator programs for ipv6_route and netlink 
Two bpf programs are added in this patch for netlink and ipv6_route
target. On my VM, I am able to achieve identical
results compared to /proc/net/netlink and /proc/net/ipv6_route.

  $ cat /proc/net/netlink
  sk               Eth Pid        Groups   Rmem     Wmem     Dump  Locks    Drops    Inode
  000000002c42d58b 0   0          00000000 0        0        0     2        0        7
  00000000a4e8b5e1 0   1          00000551 0        0        0     2        0        18719
  00000000e1b1c195 4   0          00000000 0        0        0     2        0        16422
  000000007e6b29f9 6   0          00000000 0        0        0     2        0        16424
  ....
  00000000159a170d 15  1862       00000002 0        0        0     2        0        1886
  000000009aca4bc9 15  3918224839 00000002 0        0        0     2        0        19076
  00000000d0ab31d2 15  1          00000002 0        0        0     2        0        18683
  000000008398fb08 16  0          00000000 0        0        0     2        0        27
  $ cat /sys/fs/bpf/my_netlink
  sk               Eth Pid        Groups   Rmem     Wmem     Dump  Locks    Drops    Inode
  000000002c42d58b 0   0          00000000 0        0        0     2        0        7
  00000000a4e8b5e1 0   1          00000551 0        0        0     2        0        18719
  00000000e1b1c195 4   0          00000000 0        0        0     2        0        16422
  000000007e6b29f9 6   0          00000000 0        0        0     2        0        16424
  ....
  00000000159a170d 15  1862       00000002 0        0        0     2        0        1886
  000000009aca4bc9 15  3918224839 00000002 0        0        0     2        0        19076
  00000000d0ab31d2 15  1          00000002 0        0        0     2        0        18683
  000000008398fb08 16  0          00000000 0        0        0     2        0        27

  $ cat /proc/net/ipv6_route
  fe800000000000000000000000000000 40 00000000000000000000000000000000 00 00000000000000000000000000000000 00000100 00000001 00000000 00000001     eth0
  00000000000000000000000000000000 00 00000000000000000000000000000000 00 00000000000000000000000000000000 ffffffff 00000001 00000000 00200200       lo
  00000000000000000000000000000001 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000003 00000000 80200001       lo
  fe80000000000000c04b03fffe7827ce 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000002 00000000 80200001     eth0
  ff000000000000000000000000000000 08 00000000000000000000000000000000 00 00000000000000000000000000000000 00000100 00000003 00000000 00000001     eth0
  00000000000000000000000000000000 00 00000000000000000000000000000000 00 00000000000000000000000000000000 ffffffff 00000001 00000000 00200200       lo
  $ cat /sys/fs/bpf/my_ipv6_route
  fe800000000000000000000000000000 40 00000000000000000000000000000000 00 00000000000000000000000000000000 00000100 00000001 00000000 00000001     eth0
  00000000000000000000000000000000 00 00000000000000000000000000000000 00 00000000000000000000000000000000 ffffffff 00000001 00000000 00200200       lo
  00000000000000000000000000000001 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000003 00000000 80200001       lo
  fe80000000000000c04b03fffe7827ce 80 00000000000000000000000000000000 00 00000000000000000000000000000000 00000000 00000002 00000000 80200001     eth0
  ff000000000000000000000000000000 08 00000000000000000000000000000000 00 00000000000000000000000000000000 00000100 00000003 00000000 00000001     eth0
  00000000000000000000000000000000 00 00000000000000000000000000000000 00 00000000000000000000000000000000 ffffffff 00000001 00000000 00200200       lo

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200509175921.2477493-1-yhs@fb.com
 2020-05-09 17:05:27 -07:00