bpf: offload: free program id when device disappears

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Bound programs are quite useless after their device disappears.
They are simply waiting for reference count to go to zero,
don't list them in BPF_PROG_GET_NEXT_ID by freeing their ID
early.

Note that orphaned offload programs will return -ENODEV on
BPF_OBJ_GET_INFO_BY_FD so user will never see ID 0.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

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This commit is contained in:

Jakub Kicinski 2017-12-27 18:39:07 -08:00 • committed by Daniel Borkmann

parent ce3b9db4db

commit ad8ad79f4f

3 changed files with 12 additions and 2 deletions

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2

include/linux/bpf.h

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3

kernel/bpf/offload.c

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9

kernel/bpf/syscall.c

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