From: Jiri Olsa <jolsa@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>
Cc: netdev@vger.kernel.org, bpf@vger.kernel.org,
"Andrii Nakryiko" <andriin@fb.com>, "Yonghong Song" <yhs@fb.com>,
"Song Liu" <songliubraving@fb.com>,
"Martin KaFai Lau" <kafai@fb.com>,
"Jakub Kicinski" <kuba@kernel.org>,
"David Miller" <davem@redhat.com>,
"Björn Töpel" <bjorn.topel@intel.com>,
"John Fastabend" <john.fastabend@gmail.com>,
"Jesper Dangaard Brouer" <hawk@kernel.org>
Subject: [PATCH 13/14] bpf: Add dispatchers to kallsyms
Date: Sat, 8 Feb 2020 16:42:08 +0100 [thread overview]
Message-ID: <20200208154209.1797988-14-jolsa@kernel.org> (raw)
In-Reply-To: <20200208154209.1797988-1-jolsa@kernel.org>
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>
---
include/linux/bpf.h | 19 ++++++++++++-------
kernel/bpf/dispatcher.c | 6 ++++++
2 files changed, 18 insertions(+), 7 deletions(-)
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index b91bac10d3ea..837cdc093d2c 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -520,6 +520,7 @@ struct bpf_dispatcher {
int num_progs;
void *image;
u32 image_off;
+ struct bpf_ksym ksym;
};
static __always_inline unsigned int bpf_dispatcher_nop_func(
@@ -535,13 +536,17 @@ 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, \
- .progs = {}, \
- .num_progs = 0, \
- .image = NULL, \
- .image_off = 0 \
+#define BPF_DISPATCHER_INIT(_name) { \
+ .mutex = __MUTEX_INITIALIZER(_name.mutex), \
+ .func = &_name##_func, \
+ .progs = {}, \
+ .num_progs = 0, \
+ .image = NULL, \
+ .image_off = 0, \
+ .ksym = { \
+ .name = #_name, \
+ .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
+ }, \
}
#define DEFINE_BPF_DISPATCHER(name) \
diff --git a/kernel/bpf/dispatcher.c b/kernel/bpf/dispatcher.c
index b3e5b214fed8..8771d2cc5840 100644
--- a/kernel/bpf/dispatcher.c
+++ b/kernel/bpf/dispatcher.c
@@ -152,6 +152,12 @@ void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
if (!changed)
goto out;
+ if (!prev_num_progs)
+ bpf_image_ksym_add(d->image, &d->ksym);
+
+ if (!d->num_progs)
+ bpf_ksym_del(&d->ksym);
+
bpf_dispatcher_update(d, prev_num_progs);
out:
mutex_unlock(&d->mutex);
--
2.24.1
next prev parent reply other threads:[~2020-02-08 15:43 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-08 15:41 [PATCH 00/14] bpf: Add trampoline and dispatcher to /proc/kallsyms Jiri Olsa
2020-02-08 15:41 ` [PATCH 01/14] x86/mm: Rename is_kernel_text to __is_kernel_text Jiri Olsa
2020-02-08 15:41 ` [PATCH 02/14] bpf: Add bpf_trampoline_ name prefix for DECLARE_BPF_DISPATCHER Jiri Olsa
2020-02-08 15:41 ` [PATCH 03/14] bpf: Add struct bpf_ksym Jiri Olsa
2020-02-08 15:41 ` [PATCH 04/14] bpf: Add name to " Jiri Olsa
2020-02-08 15:42 ` [PATCH 05/14] bpf: Add lnode list node " Jiri Olsa
2020-02-08 15:42 ` [PATCH 06/14] bpf: Add bpf_kallsyms_tree tree Jiri Olsa
2020-02-11 18:21 ` Andrii Nakryiko
2020-02-12 10:49 ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 07/14] bpf: Move bpf_tree add/del from bpf_prog_ksym_node_add/del Jiri Olsa
2020-02-08 15:42 ` [PATCH 08/14] bpf: Separate kallsyms add/del functions Jiri Olsa
2020-02-08 15:42 ` [PATCH 09/14] bpf: Add bpf_ksym_add/del functions Jiri Olsa
2020-02-08 15:42 ` [PATCH 10/14] bpf: Re-initialize lnode in bpf_ksym_del Jiri Olsa
2020-02-11 18:28 ` Andrii Nakryiko
2020-02-12 10:43 ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 11/14] bpf: Rename bpf_tree to bpf_progs_tree Jiri Olsa
2020-02-08 15:42 ` [PATCH 12/14] bpf: Add trampolines to kallsyms Jiri Olsa
2020-02-11 18:51 ` Andrii Nakryiko
2020-02-12 11:10 ` Jiri Olsa
2020-02-12 16:33 ` Andrii Nakryiko
2020-02-12 22:58 ` Jiri Olsa
2020-02-12 23:02 ` Jiri Olsa
2020-02-08 15:42 ` Jiri Olsa [this message]
2020-02-11 19:03 ` [PATCH 13/14] bpf: Add dispatchers " Andrii Nakryiko
2020-02-12 10:52 ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 14/14] bpf: Sort bpf kallsyms symbols Jiri Olsa
2020-02-11 19:12 ` Andrii Nakryiko
2020-02-10 15:51 ` [PATCH 00/14] bpf: Add trampoline and dispatcher to /proc/kallsyms Björn Töpel
2020-02-10 16:17 ` Jiri Olsa
2020-02-11 19:32 ` Arnaldo Carvalho de Melo
2020-02-12 11:13 ` Jiri Olsa
2020-02-12 13:31 ` Arnaldo Carvalho de Melo
2020-02-12 22:40 ` Jiri Olsa
2020-02-13 16:23 ` Jiri Olsa
2020-02-11 19:13 ` Arnaldo Carvalho de Melo
2020-02-12 10:46 ` Jiri Olsa
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