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.
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| @@ -3630,6 +3630,14 @@ union bpf_attr { · 3629 unmodified lines | ||
| 3630 | 3630 | * The number of bytes that were written (or would have been |
| 3631 | 3631 | * written if output had to be truncated due to string size), |
| 3632 | 3632 | * or a negative error in cases of failure. |
| 3633 | + * | |
| 3634 | + * long bpf_seq_printf_btf(struct seq_file *m, struct btf_ptr *ptr, u32 ptr_size, u64 flags) | |
| 3635 | + * Description | |
| 3636 | + * Use BTF to write to seq_write a string representation of | |
| 3637 | + * *ptr*->ptr, using *ptr*->type_id as per bpf_snprintf_btf(). | |
| 3638 | + * *flags* are identical to those used for bpf_snprintf_btf. | |
| 3639 | + * Return | |
| 3640 | + * 0 on success or a negative error in case of failure. | |
| 3633 | 3641 | */ |
| 3634 | 3642 | #define __BPF_FUNC_MAPPER(FN) \ |
| 3635 | 3643 | FN(unspec), \ |
| @@ -3782,6 +3790,7 @@ union bpf_attr { · 146 unmodified lines | ||
| 3782 | 3790 | FN(d_path), \ |
| 3783 | 3791 | FN(copy_from_user), \ |
| 3784 | 3792 | FN(snprintf_btf), \ |
| 3793 | + FN(seq_printf_btf), \ | |
| 3785 | 3794 | /* */ |
| 3786 | 3795 | |
| 3787 | 3796 | /* integer value in 'imm' field of BPF_CALL instruction selects which helper |