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From: Andrii Nakryiko <andriin@fb.com>
To: <bpf@vger.kernel.org>, <netdev@vger.kernel.org>, <ast@fb.com>,
	<daniel@iogearbox.net>
Cc: <andrii.nakryiko@gmail.com>, <kernel-team@fb.com>,
	Andrii Nakryiko <andriin@fb.com>, Andrey Ignatov <rdna@fb.com>,
	Takshak Chahande <ctakshak@fb.com>
Subject: [PATCH bpf-next 4/7] bpf: implement BPF XDP link-specific introspection APIs
Date: Sun, 12 Jul 2020 22:12:27 -0700	[thread overview]
Message-ID: <20200713051230.3250515-5-andriin@fb.com> (raw)
In-Reply-To: <20200713051230.3250515-1-andriin@fb.com>

Implement XDP link-specific show_fdinfo and link_info to emit ifindex.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
---
 include/uapi/linux/bpf.h |  3 +++
 net/core/dev.c           | 31 +++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 41eba148217b..533eb4fe4e03 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -3985,6 +3985,9 @@ struct bpf_link_info {
 			__u32 netns_ino;
 			__u32 attach_type;
 		} netns;
+		struct {
+			__u32 ifindex;
+		} xdp;
 	};
 } __attribute__((aligned(8)));
 
diff --git a/net/core/dev.c b/net/core/dev.c
index 025687120442..a9c634be8dd7 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -8973,6 +8973,35 @@ static void bpf_xdp_link_dealloc(struct bpf_link *link)
 	kfree(xdp_link);
 }
 
+static void bpf_xdp_link_show_fdinfo(const struct bpf_link *link,
+				     struct seq_file *seq)
+{
+	struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link);
+	u32 ifindex = 0;
+
+	rtnl_lock();
+	if (xdp_link->dev)
+		ifindex = xdp_link->dev->ifindex;
+	rtnl_unlock();
+
+	seq_printf(seq, "ifindex:\t%u\n", ifindex);
+}
+
+static int bpf_xdp_link_fill_link_info(const struct bpf_link *link,
+				       struct bpf_link_info *info)
+{
+	struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link);
+	u32 ifindex = 0;
+
+	rtnl_lock();
+	if (xdp_link->dev)
+		ifindex = xdp_link->dev->ifindex;
+	rtnl_unlock();
+
+	info->xdp.ifindex = ifindex;
+	return 0;
+}
+
 static int bpf_xdp_link_update(struct bpf_link *link, struct bpf_prog *new_prog,
 			       struct bpf_prog *old_prog)
 {
@@ -9018,6 +9047,8 @@ static int bpf_xdp_link_update(struct bpf_link *link, struct bpf_prog *new_prog,
 static const struct bpf_link_ops bpf_xdp_link_lops = {
 	.release = bpf_xdp_link_release,
 	.dealloc = bpf_xdp_link_dealloc,
+	.show_fdinfo = bpf_xdp_link_show_fdinfo,
+	.fill_link_info = bpf_xdp_link_fill_link_info,
 	.update_prog = bpf_xdp_link_update,
 };
 
-- 
2.24.1


  parent reply	other threads:[~2020-07-13  5:13 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-13  5:12 [PATCH bpf-next 0/7] BPF XDP link Andrii Nakryiko
2020-07-13  5:12 ` [PATCH bpf-next 1/7] bpf, xdp: maintain info on attached XDP BPF programs in net_device Andrii Nakryiko
2020-07-13  5:12 ` [PATCH bpf-next 2/7] bpf, xdp: add bpf_link-based XDP attachment API Andrii Nakryiko
2020-07-13  5:12 ` [PATCH bpf-next 3/7] bpf, xdp: implement LINK_UPDATE for BPF XDP link Andrii Nakryiko
2020-07-13  5:12 ` Andrii Nakryiko [this message]
2020-07-13  5:12 ` [PATCH bpf-next 5/7] libbpf: add support " Andrii Nakryiko
2020-07-13  5:12 ` [PATCH bpf-next 6/7] selftests/bpf: add BPF XDP link selftests Andrii Nakryiko
2020-07-13  5:12 ` [PATCH bpf-next 7/7] bpf, xdp: remove XDP_QUERY_PROG and XDP_QUERY_PROG_HW XDP commands Andrii Nakryiko
     [not found] <20200710224924.4087399-1-andriin@fb.com>
     [not found] ` <20200710224924.4087399-5-andriin@fb.com>
2020-07-13 14:32   ` [PATCH bpf-next 4/7] bpf: implement BPF XDP link-specific introspection APIs David Ahern
2020-07-13 22:41     ` Andrii Nakryiko

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