bpf.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Joe Burton <jevburton.kernel@gmail.com>
To: Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andrii@kernel.org>,
	Martin KaFai Lau <kafai@fb.com>
Cc: Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
	John Fastabend <john.fastabend@gmail.com>,
	KP Singh <kpsingh@kernel.org>, Petar Penkov <ppenkov@google.com>,
	Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
	netdev@vger.kernel.org, bpf@vger.kernel.org,
	Joe Burton <jevburton@google.com>
Subject: [RFC PATCH v2 07/13] bpf: Register BPF_MAP_TRACE_{UPDATE,DELETE}_ELEM hooks
Date: Wed, 29 Sep 2021 23:59:04 +0000	[thread overview]
Message-ID: <20210929235910.1765396-8-jevburton.kernel@gmail.com> (raw)
In-Reply-To: <20210929235910.1765396-1-jevburton.kernel@gmail.com>

From: Joe Burton <jevburton@google.com>

Tracing programs may now load with this hook. There is not yet a way to
invoke those programs.

Signed-off-by: Joe Burton <jevburton@google.com>
---
 kernel/bpf/map_trace.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/kernel/bpf/map_trace.c b/kernel/bpf/map_trace.c
index 77a55f8cd119..d7c52e197482 100644
--- a/kernel/bpf/map_trace.c
+++ b/kernel/bpf/map_trace.c
@@ -335,3 +335,26 @@ void bpf_trace_map_delete_elem(struct bpf_map *map,
 	bpf_map_trace_run_progs(map, BPF_MAP_TRACE_DELETE_ELEM, &ctx);
 }
 
+DEFINE_BPF_MAP_TRACE_FUNC(BPF_MAP_TRACE_UPDATE_ELEM, void *key, void *value, u64 flags);
+DEFINE_BPF_MAP_TRACE_FUNC(BPF_MAP_TRACE_DELETE_ELEM, void *key);
+
+static struct bpf_map_trace_reg map_trace_update_elem_reg_info = {
+	.target = BPF_MAP_TRACE_FUNC(BPF_MAP_TRACE_UPDATE_ELEM),
+	.trace_type = BPF_MAP_TRACE_UPDATE_ELEM,
+};
+static struct bpf_map_trace_reg map_trace_delete_elem_reg_info = {
+	.target = BPF_MAP_TRACE_FUNC(BPF_MAP_TRACE_DELETE_ELEM),
+	.trace_type = BPF_MAP_TRACE_DELETE_ELEM,
+};
+
+static int __init bpf_map_trace_init(void)
+{
+	int err = bpf_map_trace_reg_target(&map_trace_update_elem_reg_info);
+
+	err = (err ? err :
+	       bpf_map_trace_reg_target(&map_trace_delete_elem_reg_info));
+	return err;
+}
+
+late_initcall(bpf_map_trace_init);
+
-- 
2.33.0.685.g46640cef36-goog


  parent reply	other threads:[~2021-09-29 23:59 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-29 23:58 [RFC PATCH v2 00/13] Introduce BPF map tracing capability Joe Burton
2021-09-29 23:58 ` [RFC PATCH v2 01/13] bpf: Add machinery to register map tracing hooks Joe Burton
2021-09-29 23:58 ` [RFC PATCH v2 02/13] bpf: Allow loading BPF_TRACE_MAP programs Joe Burton
2021-09-29 23:59 ` [RFC PATCH v2 03/13] bpf: Add list of tracing programs to struct bpf_map Joe Burton
2021-09-29 23:59 ` [RFC PATCH v2 04/13] bpf: Define a few bpf_link_ops for BPF_TRACE_MAP Joe Burton
2021-09-30  0:26   ` Eric Dumazet
2021-09-30  1:09     ` Joe Burton
2021-09-29 23:59 ` [RFC PATCH v2 05/13] bpf: Enable creation of BPF_LINK_TYPE_MAP_TRACE Joe Burton
2021-09-29 23:59 ` [RFC PATCH v2 06/13] bpf: Add APIs to invoke tracing programs Joe Burton
2021-09-29 23:59 ` Joe Burton [this message]
2021-09-29 23:59 ` [RFC PATCH v2 08/13] libbpf: Support BPF_TRACE_MAP Joe Burton
2021-09-29 23:59 ` [RFC PATCH v2 09/13] bpf: Add infinite loop check on map tracers Joe Burton
2021-09-29 23:59 ` [RFC PATCH v2 10/13] Add bpf_map_trace_{update,delete}_elem() helper functions Joe Burton
2021-09-29 23:59 ` [RFC PATCH v2 11/13] bpf: verifier inserts map tracing helper call Joe Burton
2021-09-29 23:59 ` [RFC PATCH v2 12/13] bpf: Add selftests for map tracing Joe Burton
2021-09-29 23:59 ` [RFC PATCH v2 13/13] bpf: Add real world example " Joe Burton
2021-10-05  5:13 ` [RFC PATCH v2 00/13] Introduce BPF map tracing capability Alexei Starovoitov
2021-10-05 21:47   ` Joe Burton
2021-10-06 16:41     ` Alexei Starovoitov
2021-10-06 21:05       ` Joe Burton
2021-10-18 23:15         ` Alexei Starovoitov

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210929235910.1765396-8-jevburton.kernel@gmail.com \
    --to=jevburton.kernel@gmail.com \
    --cc=andrii@kernel.org \
    --cc=ast@kernel.org \
    --cc=bpf@vger.kernel.org \
    --cc=daniel@iogearbox.net \
    --cc=haoluo@google.com \
    --cc=jevburton@google.com \
    --cc=john.fastabend@gmail.com \
    --cc=kafai@fb.com \
    --cc=kpsingh@kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=ppenkov@google.com \
    --cc=sdf@google.com \
    --cc=songliubraving@fb.com \
    --cc=yhs@fb.com \
    --subject='Re: [RFC PATCH v2 07/13] bpf: Register BPF_MAP_TRACE_{UPDATE,DELETE}_ELEM hooks' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).