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libbpf: Add documentation for bpf_map batch operations

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This adds documention for:

- bpf_map_delete_batch()
- bpf_map_lookup_batch()
- bpf_map_lookup_and_delete_batch()
- bpf_map_update_batch()

This also updates the public API for the `keys` parameter
of `bpf_map_delete_batch()`, and both the
`keys` and `values` parameters of `bpf_map_update_batch()`
to be constants.

Signed-off-by: Grant Seltzer <grantseltzer@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20220106201304.112675-1-grantseltzer@gmail.com
This commit is contained in:
Grant Seltzer
2022-01-06 15:13:05 -05:00
committed by Andrii Nakryiko
parent 12932191c6
commit 4449d71509
2 changed files with 117 additions and 6 deletions
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8
src/bpf.c
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@@ -691,11 +691,11 @@ static int bpf_map_batch_common(int cmd, int fd, void *in_batch,
return libbpf_err_errno(ret);
}
int bpf_map_delete_batch(int fd, void *keys, __u32 *count,
int bpf_map_delete_batch(int fd, const void *keys, __u32 *count,
const struct bpf_map_batch_opts *opts)
{
return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL,
NULL, keys, NULL, count, opts);
NULL, (void *)keys, NULL, count, opts);
}
int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys,
@@ -715,11 +715,11 @@ int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch,
count, opts);
}
int bpf_map_update_batch(int fd, void *keys, void *values, __u32 *count,
int bpf_map_update_batch(int fd, const void *keys, const void *values, __u32 *count,
const struct bpf_map_batch_opts *opts)
{
return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL,
keys, values, count, opts);
(void *)keys, (void *)values, count, opts);
}
int bpf_obj_pin(int fd, const char *pathname)