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bpf: Add bpf_xdp_output() helper

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Introduce new helper that reuses existing xdp perf_event output
implementation, but can be called from raw_tracepoint programs
that receive 'struct xdp_buff *' as a tracepoint argument.

Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/bpf/158348514556.2239.11050972434793741444.stgit@xdp-tutorial
This commit is contained in:
Eelco Chaudron 2020-03-06 08:59:23 +00:00 committed by Andrii Nakryiko
parent 84cf76de9c
commit fa21d33fff
1 changed files with 25 additions and 1 deletions
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26
include/uapi/linux/bpf.h
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@ -2927,6 +2927,29 @@ union bpf_attr {
*
* **-ENOENT** if pidns does not exists for the current task.
*
* int bpf_xdp_output(void *ctx, struct bpf_map *map, u64 flags, void *data, u64 size)
* Description
* Write raw *data* blob into a special BPF perf event held by
* *map* of type **BPF_MAP_TYPE_PERF_EVENT_ARRAY**. This perf
* event must have the following attributes: **PERF_SAMPLE_RAW**
* as **sample_type**, **PERF_TYPE_SOFTWARE** as **type**, and
* **PERF_COUNT_SW_BPF_OUTPUT** as **config**.
*
* The *flags* are used to indicate the index in *map* for which
* the value must be put, masked with **BPF_F_INDEX_MASK**.
* Alternatively, *flags* can be set to **BPF_F_CURRENT_CPU**
* to indicate that the index of the current CPU core should be
* used.
*
* The value to write, of *size*, is passed through eBPF stack and
* pointed by *data*.
*
* *ctx* is a pointer to in-kernel struct xdp_buff.
*
* This helper is similar to **bpf_perf_eventoutput**\ () but
* restricted to raw_tracepoint bpf programs.
* Return
* 0 on success, or a negative error in case of failure.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@ -3049,7 +3072,8 @@ union bpf_attr {
FN(send_signal_thread), \
FN(jiffies64), \
FN(read_branch_records), \
FN(get_ns_current_pid_tgid),
FN(get_ns_current_pid_tgid), \
FN(xdp_output),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call