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bpf: Add bpf_seq_printf_btf helper

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A helper is added to allow seq file writing of kernel data
structures using vmlinux BTF.  Its signature is

long bpf_seq_printf_btf(struct seq_file *m, struct btf_ptr *ptr,
                        u32 btf_ptr_size, u64 flags);

Flags and struct btf_ptr definitions/use are identical to the
bpf_snprintf_btf helper, and the helper returns 0 on success
or a negative error value.

Suggested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/1601292670-1616-8-git-send-email-alan.maguire@oracle.com
This commit is contained in:
Alan Maguire
2020-09-28 12:31:09 +01:00
committed by Alexei Starovoitov
parent eb58bbf2e5
commit eb411377ae
6 changed files with 56 additions and 2 deletions
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9
tools/include/uapi/linux/bpf.h
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@@ -3630,6 +3630,14 @@ union bpf_attr {
* The number of bytes that were written (or would have been
* written if output had to be truncated due to string size),
* or a negative error in cases of failure.
*
* long bpf_seq_printf_btf(struct seq_file *m, struct btf_ptr *ptr, u32 ptr_size, u64 flags)
* Description
* Use BTF to write to seq_write a string representation of
* *ptr*->ptr, using *ptr*->type_id as per bpf_snprintf_btf().
* *flags* are identical to those used for bpf_snprintf_btf.
* Return
* 0 on success or a negative error in case of failure.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@@ -3782,6 +3790,7 @@ union bpf_attr {
FN(d_path), \
FN(copy_from_user), \
FN(snprintf_btf), \
FN(seq_printf_btf), \
/* */
/* integer value in 'imm' field of BPF_CALL instruction selects which helper