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From: Toshiaki Makita <toshiaki.makita1@gmail.com>
To: Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
	Yonghong Song <yhs@fb.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <jakub.kicinski@netronome.com>,
	Jesper Dangaard Brouer <hawk@kernel.org>,
	John Fastabend <john.fastabend@gmail.com>,
	Jamal Hadi Salim <jhs@mojatatu.com>,
	Cong Wang <xiyou.wangcong@gmail.com>,
	Jiri Pirko <jiri@resnulli.us>
Cc: Toshiaki Makita <toshiaki.makita1@gmail.com>,
	netdev@vger.kernel.org, bpf@vger.kernel.org,
	William Tu <u9012063@gmail.com>
Subject: [RFC PATCH bpf-next 03/14] bpf: Add API to get program from id
Date: Tue, 13 Aug 2019 21:05:47 +0900
Message-ID: <20190813120558.6151-4-toshiaki.makita1@gmail.com> (raw)
In-Reply-To: <20190813120558.6151-1-toshiaki.makita1@gmail.com>

Factor out the logic in bpf_prog_get_fd_by_id() and add
bpf_prog_get_by_id(). Also export bpf_prog_get_ok().
They are used by the next commit to get bpf prog from its id.

Signed-off-by: Toshiaki Makita <toshiaki.makita1@gmail.com>
---
 include/linux/bpf.h  |  6 ++++++
 kernel/bpf/syscall.c | 26 ++++++++++++++++++--------
 2 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index f9a5061..d8ad865 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -633,6 +633,7 @@ int bpf_prog_array_copy(struct bpf_prog_array *old_array,
 struct bpf_prog *bpf_prog_get(u32 ufd);
 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
 				       bool attach_drv);
+struct bpf_prog *bpf_prog_get_by_id(u32 id);
 struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i);
 void bpf_prog_sub(struct bpf_prog *prog, int i);
 struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog);
@@ -755,6 +756,11 @@ static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
 	return ERR_PTR(-EOPNOTSUPP);
 }
 
+static inline struct bpf_prog *bpf_prog_get_by_id(u32 id)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+
 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog,
 							  int i)
 {
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 5d141f1..cb5ecc4 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -1495,6 +1495,7 @@ bool bpf_prog_get_ok(struct bpf_prog *prog,
 
 	return true;
 }
+EXPORT_SYMBOL_GPL(bpf_prog_get_ok);
 
 static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type,
 				       bool attach_drv)
@@ -2122,6 +2123,22 @@ static int bpf_obj_get_next_id(const union bpf_attr *attr,
 	return err;
 }
 
+struct bpf_prog *bpf_prog_get_by_id(u32 id)
+{
+	struct bpf_prog *prog;
+
+	spin_lock_bh(&prog_idr_lock);
+	prog = idr_find(&prog_idr, id);
+	if (prog)
+		prog = bpf_prog_inc_not_zero(prog);
+	else
+		prog = ERR_PTR(-ENOENT);
+	spin_unlock_bh(&prog_idr_lock);
+
+	return prog;
+}
+EXPORT_SYMBOL_GPL(bpf_prog_get_by_id);
+
 #define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id
 
 static int bpf_prog_get_fd_by_id(const union bpf_attr *attr)
@@ -2136,14 +2153,7 @@ static int bpf_prog_get_fd_by_id(const union bpf_attr *attr)
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
-	spin_lock_bh(&prog_idr_lock);
-	prog = idr_find(&prog_idr, id);
-	if (prog)
-		prog = bpf_prog_inc_not_zero(prog);
-	else
-		prog = ERR_PTR(-ENOENT);
-	spin_unlock_bh(&prog_idr_lock);
-
+	prog = bpf_prog_get_by_id(id);
 	if (IS_ERR(prog))
 		return PTR_ERR(prog);
 
-- 
1.8.3.1


  parent reply index

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-13 12:05 [RFC PATCH bpf-next 00/14] xdp_flow: Flow offload to XDP Toshiaki Makita
2019-08-13 12:05 ` [RFC PATCH bpf-next 01/14] xdp_flow: Add skeleton of XDP based TC offload driver Toshiaki Makita
2019-08-13 12:05 ` [RFC PATCH bpf-next 02/14] xdp_flow: Add skeleton bpf program for XDP Toshiaki Makita
2019-08-13 12:05 ` Toshiaki Makita [this message]
2019-08-13 12:05 ` [RFC PATCH bpf-next 04/14] xdp_flow: Attach bpf prog to XDP in kernel after UMH loaded program Toshiaki Makita
2019-08-13 12:05 ` [RFC PATCH bpf-next 05/14] xdp_flow: Prepare flow tables in bpf Toshiaki Makita
2019-08-13 12:05 ` [RFC PATCH bpf-next 06/14] xdp_flow: Add flow entry insertion/deletion logic in UMH Toshiaki Makita
2019-08-13 12:05 ` [RFC PATCH bpf-next 07/14] xdp_flow: Add flow handling and basic actions in bpf prog Toshiaki Makita
2019-08-13 12:05 ` [RFC PATCH bpf-next 08/14] xdp_flow: Implement flow replacement/deletion logic in xdp_flow kmod Toshiaki Makita
2019-08-13 12:05 ` [RFC PATCH bpf-next 09/14] xdp_flow: Add netdev feature for enabling TC flower offload to XDP Toshiaki Makita
2019-08-13 12:05 ` [RFC PATCH bpf-next 10/14] xdp_flow: Implement redirect action Toshiaki Makita
2019-08-13 12:05 ` [RFC PATCH bpf-next 11/14] xdp_flow: Implement vlan_push action Toshiaki Makita
2019-08-13 12:05 ` [RFC PATCH bpf-next 12/14] bpf, selftest: Add test for xdp_flow Toshiaki Makita
2019-08-13 12:05 ` [RFC PATCH bpf-next 13/14] i40e: prefetch xdp->data before running XDP prog Toshiaki Makita
2019-08-13 12:05 ` [RFC PATCH bpf-next 14/14] bpf, hashtab: Compare keys in long Toshiaki Makita
2019-08-14  1:44 ` [RFC PATCH bpf-next 00/14] xdp_flow: Flow offload to XDP Alexei Starovoitov
2019-08-14  7:33   ` Toshiaki Makita
2019-08-15 10:59     ` Toshiaki Makita
2019-08-14 17:07 ` Stanislav Fomichev
2019-08-15 10:26   ` Toshiaki Makita
2019-08-15 15:21     ` Stanislav Fomichev
2019-08-15 19:22       ` Jakub Kicinski
2019-08-16  1:28         ` Toshiaki Makita
2019-08-16 18:52           ` Jakub Kicinski
2019-08-17 14:01             ` Toshiaki Makita
2019-08-19 18:15               ` Jakub Kicinski
2019-08-21  8:49                 ` Toshiaki Makita
2019-08-21 18:38                   ` Jakub Kicinski
2019-08-16 15:59         ` Stanislav Fomichev
2019-08-16 16:20           ` Stanislav Fomichev
2019-08-16  1:09       ` Toshiaki Makita
2019-08-16 15:35         ` Stanislav Fomichev
2019-08-17 14:10           ` Toshiaki Makita
2019-08-15 15:46 ` William Tu
2019-08-16  1:38   ` Toshiaki Makita

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