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bpf: Add link_info support for uprobe multi link #657

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bpf: Add link_info support for uprobe multi link #657

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Pull request for series with
subject: bpf: Add link_info support for uprobe multi link
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=799882

@danielocfb
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Upstream branch: b4e59c1
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=799882
version: 1

@danielocfb
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Upstream branch: b4e59c1
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=799882
version: 1

@danielocfb danielocfb force-pushed the series/796571=>bpf-next branch from 6ec6e49 to 30160f4 Compare November 9, 2023 17:57
@danielocfb danielocfb force-pushed the bpf-next_base branch 2 times, most recently from 902178a to bc1b833 Compare November 9, 2023 18:41
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Upstream branch: 3815f89
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=799882
version: 1

@danielocfb danielocfb force-pushed the series/796571=>bpf-next branch from 30160f4 to 0bba472 Compare November 9, 2023 18:41
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Upstream branch: 3815f89
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=799882
version: 1

@danielocfb danielocfb force-pushed the series/796571=>bpf-next branch from 0bba472 to 202b850 Compare November 9, 2023 18:49
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Upstream branch: 6f101db
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=799882
version: 1

@danielocfb danielocfb force-pushed the series/796571=>bpf-next branch from 202b850 to 207907f Compare November 9, 2023 19:02
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Upstream branch: 6f101db
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=799882
version: 1

@danielocfb danielocfb force-pushed the series/796571=>bpf-next branch from 207907f to bdb891b Compare November 9, 2023 19:12
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Upstream branch: e80742d
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=799882
version: 1

@danielocfb danielocfb force-pushed the series/796571=>bpf-next branch from bdb891b to 53cffee Compare November 9, 2023 19:20
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Upstream branch: e80742d
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=799882
version: 1

@danielocfb danielocfb force-pushed the series/796571=>bpf-next branch from 53cffee to d9db658 Compare November 9, 2023 20:36
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Upstream branch: e80742d
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=799882
version: 1

@danielocfb danielocfb force-pushed the series/796571=>bpf-next branch from d9db658 to 4c5a3e3 Compare November 9, 2023 21:00
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Upstream branch: e80742d
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=799882
version: 1

@danielocfb danielocfb force-pushed the series/796571=>bpf-next branch from 4c5a3e3 to f4bd31b Compare November 9, 2023 21:15
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Upstream branch: 155addf
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=799882
version: 1

@danielocfb danielocfb force-pushed the series/796571=>bpf-next branch from f4bd31b to e02efad Compare November 10, 2023 04:47
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Upstream branch: 689b097
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=799882
version: 1

@danielocfb danielocfb force-pushed the series/796571=>bpf-next branch from e02efad to 8fb821c Compare November 10, 2023 15:59
@olsajiri @d-e-s-o
libbpf: Add st_type argument to elf_resolve_syms_offsets function
8045e79 
We need to get offsets for static variables in following changes,
so making elf_resolve_syms_offsets to take st_type value as argument
and passing it to elf_sym_iter_new.

Acked-by: Song Liu <[email protected]>
Signed-off-by: Jiri Olsa <[email protected]>
Acked-by: Andrii Nakryiko <[email protected]>
@olsajiri @d-e-s-o
bpf: Store ref_ctr_offsets values in bpf_uprobe array
848617b 
We will need to return ref_ctr_offsets values through link_info
interface in following change, so we need to keep them around.

Storing ref_ctr_offsets values directly into bpf_uprobe array.

Acked-by: Song Liu <[email protected]>
Signed-off-by: Jiri Olsa <[email protected]>
Acked-by: Andrii Nakryiko <[email protected]>
@olsajiri @d-e-s-o
bpf: Add link_info support for uprobe multi link
7918c07 
Adding support to get uprobe_link details through bpf_link_info
interface.

Adding new struct uprobe_multi to struct bpf_link_info to carry
the uprobe_multi link details.

The uprobe_multi.count is passed from user space to denote size
of array fields (offsets/ref_ctr_offsets/cookies). The actual
array size is stored back to uprobe_multi.count (allowing user
to find out the actual array size) and array fields are populated
up to the user passed size.

All the non-array fields (path/count/flags/pid) are always set.

Signed-off-by: Jiri Olsa <[email protected]>
@olsajiri @d-e-s-o
selftests/bpf: Use bpf_link__destroy in fill_link_info tests
c23ebff 
The fill_link_info test keeps skeleton open and just creates
various links. We are wrongly calling bpf_link__detach after
each test to close them, we need to call bpf_link__destroy.

Signed-off-by: Jiri Olsa <[email protected]>
Acked-by: Yafang Shao <[email protected]>
@olsajiri @d-e-s-o
selftests/bpf: Add link_info test for uprobe_multi link
6d80057 
Adding fill_link_info test for uprobe_multi link.

Setting up uprobes with bogus ref_ctr_offsets and cookie values
to test all the bpf_link_info::uprobe_multi fields.

Acked-by: Song Liu <[email protected]>
Signed-off-by: Jiri Olsa <[email protected]>
@danielocfb
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Upstream branch: 9241176
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=799882
version: 1

@olsajiri @d-e-s-o
bpftool: Add support to display uprobe_multi links
6fbda3d 
Adding support to display details for uprobe_multi links,
both plain:

  # bpftool link -p
  ...
  24: uprobe_multi  prog 126
          uprobe.multi  path /home/jolsa/bpf/test_progs  func_cnt 3  pid 4143
          offset             ref_ctr_offset     cookies
          0xd1f88            0xf5d5a8           0xdead
          0xd1f8f            0xf5d5aa           0xbeef
          0xd1f96            0xf5d5ac           0xcafe

and json:

  # bpftool link -p
  [{
  ...
      },{
          "id": 24,
          "type": "uprobe_multi",
          "prog_id": 126,
          "retprobe": false,
          "path": "/home/jolsa/bpf/test_progs",
          "func_cnt": 3,
          "pid": 4143,
          "funcs": [{
                  "offset": 860040,
                  "ref_ctr_offset": 16111016,
                  "cookie": 57005
              },{
                  "offset": 860047,
                  "ref_ctr_offset": 16111018,
                  "cookie": 48879
              },{
                  "offset": 860054,
                  "ref_ctr_offset": 16111020,
                  "cookie": 51966
              }
          ]
      }
  ]

Acked-by: Song Liu <[email protected]>
Reviewed-by: Quentin Monnet <[email protected]>
Signed-off-by: Jiri Olsa <[email protected]>
@danielocfb danielocfb force-pushed the series/796571=>bpf-next branch from 8fb821c to 6fbda3d Compare November 10, 2023 17:08
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@danielocfb @olsajiri