diff options
Diffstat (limited to 'tools/include')
| -rw-r--r-- | tools/include/uapi/linux/bpf.h | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 708763f702e1..9d1932e23cec 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -3077,6 +3077,41 @@ union bpf_attr { * See: clock_gettime(CLOCK_BOOTTIME) * Return * Current *ktime*. + * + * int bpf_seq_printf(struct seq_file *m, const char *fmt, u32 fmt_size, const void *data, u32 data_len) + * Description + * seq_printf uses seq_file seq_printf() to print out the format string. + * The *m* represents the seq_file. The *fmt* and *fmt_size* are for + * the format string itself. The *data* and *data_len* are format string + * arguments. The *data* are a u64 array and corresponding format string + * values are stored in the array. For strings and pointers where pointees + * are accessed, only the pointer values are stored in the *data* array. + * The *data_len* is the *data* size in term of bytes. + * + * Formats **%s**, **%p{i,I}{4,6}** requires to read kernel memory. + * Reading kernel memory may fail due to either invalid address or + * valid address but requiring a major memory fault. If reading kernel memory + * fails, the string for **%s** will be an empty string, and the ip + * address for **%p{i,I}{4,6}** will be 0. Not returning error to + * bpf program is consistent with what bpf_trace_printk() does for now. + * Return + * 0 on success, or a negative errno in case of failure. + * + * * **-EBUSY** Percpu memory copy buffer is busy, can try again + * by returning 1 from bpf program. + * * **-EINVAL** Invalid arguments, or invalid/unsupported formats. + * * **-E2BIG** Too many format specifiers. + * * **-EOVERFLOW** Overflow happens, the same object will be tried again. + * + * int bpf_seq_write(struct seq_file *m, const void *data, u32 len) + * Description + * seq_write uses seq_file seq_write() to write the data. + * The *m* represents the seq_file. The *data* and *len* represent the + * data to write in bytes. + * Return + * 0 on success, or a negative errno in case of failure. + * + * * **-EOVERFLOW** Overflow happens, the same object will be tried again. */ #define __BPF_FUNC_MAPPER(FN) \ FN(unspec), \ @@ -3204,7 +3239,9 @@ union bpf_attr { FN(get_netns_cookie), \ FN(get_current_ancestor_cgroup_id), \ FN(sk_assign), \ - FN(ktime_get_boot_ns), + FN(ktime_get_boot_ns), \ + FN(seq_printf), \ + FN(seq_write), /* integer value in 'imm' field of BPF_CALL instruction selects which helper * function eBPF program intends to call |