Commit 517b75e4 authored by Jiri Olsa's avatar Jiri Olsa Committed by Alexei Starovoitov
Browse files

bpf: Add dispatchers to kallsyms 



Adding dispatchers to kallsyms. It's displayed as
  bpf_dispatcher_<NAME>

where NAME is the name of dispatcher.

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200312195610.346362-12-jolsa@kernel.org


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent a108f7dc

include/linux/bpf.h

+12 −7
Original line number Diff line number Diff line
@@ -531,6 +531,7 @@ struct bpf_dispatcher { 
	int num_progs;

	void *image;

	u32 image_off;

	struct bpf_ksym ksym;

};



static __always_inline unsigned int bpf_dispatcher_nop_func(
@@ -546,13 +547,17 @@ struct bpf_trampoline *bpf_trampoline_lookup(u64 key); 
int bpf_trampoline_link_prog(struct bpf_prog *prog);

int bpf_trampoline_unlink_prog(struct bpf_prog *prog);

void bpf_trampoline_put(struct bpf_trampoline *tr);

#define BPF_DISPATCHER_INIT(name) {			\

	.mutex = __MUTEX_INITIALIZER(name.mutex),	\

	.func = &name##_func,				\

#define BPF_DISPATCHER_INIT(_name) {				\

	.mutex = __MUTEX_INITIALIZER(_name.mutex),		\

	.func = &_name##_func,					\

	.progs = {},						\

	.num_progs = 0,						\

	.image = NULL,						\

	.image_off = 0					\

	.image_off = 0,						\

	.ksym = {						\

		.name  = #_name,				\

		.lnode = LIST_HEAD_INIT(_name.ksym.lnode),	\

	},							\

}



#define DEFINE_BPF_DISPATCHER(name)					\

kernel/bpf/dispatcher.c

+1 −0
Original line number Diff line number Diff line
@@ -143,6 +143,7 @@ void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from, 
		d->image = bpf_image_alloc();

		if (!d->image)

			goto out;

		bpf_image_ksym_add(d->image, &d->ksym);

	}



	prev_num_progs = d->num_progs;

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