diff mbox series

[bpf-next,v5,8/8] bpftool: Fix pid_iter.bpf.c to comply with the change of bpf_link_fops.

Message ID 20240523230848.2022072-9-thinker.li@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Notify user space when a struct_ops object is detached/unregistered | expand

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bpf/vmtest-bpf-next-VM_Test-7 success Logs for aarch64-gcc / test (test_progs, false, 360) / test_progs on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-8 success Logs for aarch64-gcc / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-13 success Logs for s390x-gcc / test (test_maps, false, 360) / test_maps on s390x with gcc
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bpf/vmtest-bpf-next-VM_Test-23 success Logs for x86_64-gcc / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-30 success Logs for x86_64-llvm-17 / test (test_maps, false, 360) / test_maps on x86_64 with llvm-17
bpf/vmtest-bpf-next-VM_Test-31 success Logs for x86_64-llvm-17 / test (test_progs, false, 360) / test_progs on x86_64 with llvm-17
bpf/vmtest-bpf-next-VM_Test-32 success Logs for x86_64-llvm-17 / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with llvm-17
bpf/vmtest-bpf-next-VM_Test-37 success Logs for x86_64-llvm-18 / test (test_maps, false, 360) / test_maps on x86_64 with llvm-18
bpf/vmtest-bpf-next-VM_Test-38 success Logs for x86_64-llvm-18 / test (test_progs, false, 360) / test_progs on x86_64 with llvm-18
bpf/vmtest-bpf-next-VM_Test-39 success Logs for x86_64-llvm-18 / test (test_progs_cpuv4, false, 360) / test_progs_cpuv4 on x86_64 with llvm-18
bpf/vmtest-bpf-next-VM_Test-40 success Logs for x86_64-llvm-18 / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with llvm-18
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/apply fail Patch does not apply to bpf-next-0

Commit Message

Kui-Feng Lee May 23, 2024, 11:08 p.m. UTC 
To support epoll, a new instance of file_operations, bpf_link_fops_poll,
has been added for links that support epoll. The pid_iter.bpf.c checks
f_ops for links and other BPF objects. The check should fail for struct_ops
links without this patch.

Cc: Quentin Monnet <qmo@kernel.org>
Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
---
 tools/bpf/bpftool/skeleton/pid_iter.bpf.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

Comments

Quentin Monnet May 24, 2024, 4:20 p.m. UTC | #1 
2024-05-24 00:09 UTC+0100 ~ Kui-Feng Lee <thinker.li@gmail.com>
> To support epoll, a new instance of file_operations, bpf_link_fops_poll,
> has been added for links that support epoll. The pid_iter.bpf.c checks
> f_ops for links and other BPF objects. The check should fail for struct_ops
> links without this patch.
> 
> Cc: Quentin Monnet <qmo@kernel.org>
> Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>

The bpftool change looks OK to me, thanks!
Although I wouldn't call it a "fix" (in the commit object).

Acked-by: Quentin Monnet <qmo@kernel.org>
Kui-Feng Lee May 24, 2024, 4:58 p.m. UTC | #2 
On 5/24/24 09:20, Quentin Monnet wrote:
> 2024-05-24 00:09 UTC+0100 ~ Kui-Feng Lee <thinker.li@gmail.com>
>> To support epoll, a new instance of file_operations, bpf_link_fops_poll,
>> has been added for links that support epoll. The pid_iter.bpf.c checks
>> f_ops for links and other BPF objects. The check should fail for struct_ops
>> links without this patch.
>>
>> Cc: Quentin Monnet <qmo@kernel.org>
>> Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
> 
> The bpftool change looks OK to me, thanks!
> Although I wouldn't call it a "fix" (in the commit object).

Got it! I would love to change it.

> 
> Acked-by: Quentin Monnet <qmo@kernel.org>

Thank you for the review.
diff mbox series

Patch

diff --git a/tools/bpf/bpftool/skeleton/pid_iter.bpf.c b/tools/bpf/bpftool/skeleton/pid_iter.bpf.c
index 7bdbcac3cf62..948dde25034e 100644
--- a/tools/bpf/bpftool/skeleton/pid_iter.bpf.c
+++ b/tools/bpf/bpftool/skeleton/pid_iter.bpf.c
@@ -29,6 +29,7 @@  enum bpf_link_type___local {
 };
 
 extern const void bpf_link_fops __ksym;
+extern const void bpf_link_fops_poll __ksym __weak;
 extern const void bpf_map_fops __ksym;
 extern const void bpf_prog_fops __ksym;
 extern const void btf_fops __ksym;
@@ -84,7 +85,11 @@  int iter(struct bpf_iter__task_file *ctx)
 		fops = &btf_fops;
 		break;
 	case BPF_OBJ_LINK:
-		fops = &bpf_link_fops;
+		if (&bpf_link_fops_poll &&
+		    file->f_op == &bpf_link_fops_poll)
+			fops = &bpf_link_fops_poll;
+		else
+			fops = &bpf_link_fops;
 		break;
 	default:
 		return 0;