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bpf: Add dispatchers to kallsyms

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

where NAME is the name of dispatcher.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200312195610.346362-12-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiri Olsa 2020-03-12 20:56:06 +01:00 committed by Alexei Starovoitov
parent a108f7dcfa
commit 517b75e44c
2 changed files with 13 additions and 7 deletions
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13
include/linux/bpf.h
View File

@ -531,6 +531,7 @@ struct bpf_dispatcher {
int num_progs; int num_progs;
void *image; void *image;
u32 image_off; u32 image_off;
struct bpf_ksym ksym;
}; };
static __always_inline unsigned int bpf_dispatcher_nop_func( 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_link_prog(struct bpf_prog *prog);
int bpf_trampoline_unlink_prog(struct bpf_prog *prog); int bpf_trampoline_unlink_prog(struct bpf_prog *prog);
void bpf_trampoline_put(struct bpf_trampoline *tr); void bpf_trampoline_put(struct bpf_trampoline *tr);
#define BPF_DISPATCHER_INIT(name) { \ #define BPF_DISPATCHER_INIT(_name) { \
.mutex = __MUTEX_INITIALIZER(name.mutex), \ .mutex = __MUTEX_INITIALIZER(_name.mutex), \
.func = &name##_func, \ .func = &_name##_func, \
.progs = {}, \ .progs = {}, \
.num_progs = 0, \ .num_progs = 0, \
.image = NULL, \ .image = NULL, \
.image_off = 0 \ .image_off = 0, \
.ksym = { \
.name = #_name, \
.lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
}, \
} }
#define DEFINE_BPF_DISPATCHER(name) \ #define DEFINE_BPF_DISPATCHER(name) \

1
kernel/bpf/dispatcher.c
View File

@ -143,6 +143,7 @@ void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
d->image = bpf_image_alloc(); d->image = bpf_image_alloc();
if (!d->image) if (!d->image)
goto out; goto out;
bpf_image_ksym_add(d->image, &d->ksym);
} }
prev_num_progs = d->num_progs; prev_num_progs = d->num_progs;