netdev - [PATCH bpf-next v2] bpf: add BTF ids in procfs for file descriptors to BTF objects

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Message-Id: <20190820135346.7593-1-quentin.monnet@netronome.com>
Date:   Tue, 20 Aug 2019 14:53:46 +0100
From:   Quentin Monnet <quentin.monnet@...ronome.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        oss-drivers@...ronome.com,
        Quentin Monnet <quentin.monnet@...ronome.com>
Subject: [PATCH bpf-next v2] bpf: add BTF ids in procfs for file descriptors to BTF objects

Implement the show_fdinfo hook for BTF FDs file operations, and make it
print the id of the BTF object. This allows for a quick retrieval of the
BTF id from its FD; or it can help understanding what type of object
(BTF) the file descriptor points to.

v2:
- Do not expose data_size, only btf_id, in FD info.

Signed-off-by: Quentin Monnet <quentin.monnet@...ronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
---
 kernel/bpf/btf.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 5fcc7a17eb5a..6b403dc18486 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -3376,6 +3376,15 @@ void btf_type_seq_show(const struct btf *btf, u32 type_id, void *obj,
 	btf_type_ops(t)->seq_show(btf, t, type_id, obj, 0, m);
 }
 
+#ifdef CONFIG_PROC_FS
+static void bpf_btf_show_fdinfo(struct seq_file *m, struct file *filp)
+{
+	const struct btf *btf = filp->private_data;
+
+	seq_printf(m, "btf_id:\t%u\n", btf->id);
+}
+#endif
+
 static int btf_release(struct inode *inode, struct file *filp)
 {
 	btf_put(filp->private_data);
@@ -3383,6 +3392,9 @@ static int btf_release(struct inode *inode, struct file *filp)
 }
 
 const struct file_operations btf_fops = {
+#ifdef CONFIG_PROC_FS
+	.show_fdinfo	= bpf_btf_show_fdinfo,
+#endif
 	.release	= btf_release,
 };
 
-- 
2.17.1