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Commit de2ff05f authored by Yonghong Song's avatar Yonghong Song Committed by Alexei Starovoitov
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tools/bpf: add bpf_get_stack helper to tools headers 



The tools header file bpf.h is synced with kernel uapi bpf.h.
The new helper is also added to bpf_helpers.h.

Signed-off-by: default avatarYonghong Song <yhs@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 9cbe1f5a

tools/include/uapi/linux/bpf.h

+40 −2
Original line number Diff line number Diff line
@@ -1767,6 +1767,40 @@ union bpf_attr { 
 * 		**CONFIG_XFRM** configuration option.

 * 	Return

 * 		0 on success, or a negative error in case of failure.

 *

 * int bpf_get_stack(struct pt_regs *regs, void *buf, u32 size, u64 flags)

 * 	Description

 *		Return a user or a kernel stack in bpf program provided buffer.

 *		To achieve this, the helper needs *ctx*, which is a pointer

 *		to the context on which the tracing program is executed.

 *		To store the stacktrace, the bpf program provides *buf* with

 *		a nonnegative *size*.

 *

 *		The last argument, *flags*, holds the number of stack frames to

 *		skip (from 0 to 255), masked with

 *		**BPF_F_SKIP_FIELD_MASK**. The next bits can be used to set

 *		the following flags:

 *

 *		**BPF_F_USER_STACK**

 *			Collect a user space stack instead of a kernel stack.

 *		**BPF_F_USER_BUILD_ID**

 *			Collect buildid+offset instead of ips for user stack,

 *			only valid if **BPF_F_USER_STACK** is also specified.

 *

 *		**bpf_get_stack**\ () can collect up to

 *		**PERF_MAX_STACK_DEPTH** both kernel and user frames, subject

 *		to sufficient large buffer size. Note that

 *		this limit can be controlled with the **sysctl** program, and

 *		that it should be manually increased in order to profile long

 *		user stacks (such as stacks for Java programs). To do so, use:

 *

 *	::

 *

 *		# sysctl kernel.perf_event_max_stack=<new value>

 *

 * 	Return

 * 		a non-negative value equal to or less than size on success, or

 * 		a negative error in case of failure.

 */

#define __BPF_FUNC_MAPPER(FN)		\

	FN(unspec),			\
@@ -1835,7 +1869,8 @@ union bpf_attr { 
	FN(msg_pull_data),		\

	FN(bind),			\

	FN(xdp_adjust_tail),		\

	FN(skb_get_xfrm_state),

	FN(skb_get_xfrm_state),		\

	FN(get_stack),



/* integer value in 'imm' field of BPF_CALL instruction selects which helper

 * function eBPF program intends to call
@@ -1869,11 +1904,14 @@ enum bpf_func_id { 
/* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */

#define BPF_F_TUNINFO_IPV6		(1ULL << 0)



/* BPF_FUNC_get_stackid flags. */

/* flags for both BPF_FUNC_get_stackid and BPF_FUNC_get_stack. */

#define BPF_F_SKIP_FIELD_MASK		0xffULL

#define BPF_F_USER_STACK		(1ULL << 8)

/* flags used by BPF_FUNC_get_stackid only. */

#define BPF_F_FAST_STACK_CMP		(1ULL << 9)

#define BPF_F_REUSE_STACKID		(1ULL << 10)

/* flags used by BPF_FUNC_get_stack only. */

#define BPF_F_USER_BUILD_ID		(1ULL << 11)



/* BPF_FUNC_skb_set_tunnel_key flags. */

#define BPF_F_ZERO_CSUM_TX		(1ULL << 1)

tools/testing/selftests/bpf/bpf_helpers.h

+2 −0
Original line number Diff line number Diff line
@@ -101,6 +101,8 @@ static int (*bpf_xdp_adjust_tail)(void *ctx, int offset) = 
static int (*bpf_skb_get_xfrm_state)(void *ctx, int index, void *state,

				     int size, int flags) =

	(void *) BPF_FUNC_skb_get_xfrm_state;

static int (*bpf_get_stack)(void *ctx, void *buf, int size, int flags) =

	(void *) BPF_FUNC_get_stack;



/* llvm builtin functions that eBPF C program may use to

 * emit BPF_LD_ABS and BPF_LD_IND instructions