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Date: Wed, 21 Jun 2023 10:02:34 -0700
From: Stanislav Fomichev <sdf@...gle.com>
To: bpf@...r.kernel.org
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
martin.lau@...ux.dev, song@...nel.org, yhs@...com, john.fastabend@...il.com,
kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com, jolsa@...nel.org,
netdev@...r.kernel.org
Subject: [RFC bpf-next v2 01/11] bpf: Rename some xdp-metadata functions into dev-bound
No functional changes.
To make existing dev-bound infrastructure more generic and be
less tightly bound to the xdp layer, rename some functions and
move kfunc-related things into kernel/bpf/offload.c
Cc: netdev@...r.kernel.org
Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
---
include/net/offload.h | 28 ++++++++++++++++++++++++++++
include/net/xdp.h | 18 +-----------------
kernel/bpf/offload.c | 26 ++++++++++++++++++++++++--
kernel/bpf/verifier.c | 4 ++--
net/core/xdp.c | 20 ++------------------
5 files changed, 57 insertions(+), 39 deletions(-)
create mode 100644 include/net/offload.h
diff --git a/include/net/offload.h b/include/net/offload.h
new file mode 100644
index 000000000000..264a35881473
--- /dev/null
+++ b/include/net/offload.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __LINUX_NET_OFFLOAD_H__
+#define __LINUX_NET_OFFLOAD_H__
+
+#include <linux/types.h>
+
+#define XDP_METADATA_KFUNC_xxx \
+ NETDEV_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_TIMESTAMP, \
+ bpf_xdp_metadata_rx_timestamp) \
+ NETDEV_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_HASH, \
+ bpf_xdp_metadata_rx_hash)
+
+enum {
+#define NETDEV_METADATA_KFUNC(name, _) name,
+XDP_METADATA_KFUNC_xxx
+#undef NETDEV_METADATA_KFUNC
+MAX_NETDEV_METADATA_KFUNC,
+};
+
+#ifdef CONFIG_NET
+u32 bpf_dev_bound_kfunc_id(int id);
+bool bpf_is_dev_bound_kfunc(u32 btf_id);
+#else
+static inline u32 bpf_dev_bound_kfunc_id(int id) { return 0; }
+static inline bool bpf_is_dev_bound_kfunc(u32 btf_id) { return false; }
+#endif
+
+#endif /* __LINUX_NET_OFFLOAD_H__ */
diff --git a/include/net/xdp.h b/include/net/xdp.h
index d1c5381fc95f..de4c3b70abde 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -9,6 +9,7 @@
#include <linux/skbuff.h> /* skb_shared_info */
#include <uapi/linux/netdev.h>
#include <linux/bitfield.h>
+#include <net/offload.h>
/**
* DOC: XDP RX-queue information
@@ -384,19 +385,6 @@ void xdp_attachment_setup(struct xdp_attachment_info *info,
#define DEV_MAP_BULK_SIZE XDP_BULK_QUEUE_SIZE
-#define XDP_METADATA_KFUNC_xxx \
- XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_TIMESTAMP, \
- bpf_xdp_metadata_rx_timestamp) \
- XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_HASH, \
- bpf_xdp_metadata_rx_hash) \
-
-enum {
-#define XDP_METADATA_KFUNC(name, _) name,
-XDP_METADATA_KFUNC_xxx
-#undef XDP_METADATA_KFUNC
-MAX_XDP_METADATA_KFUNC,
-};
-
enum xdp_rss_hash_type {
/* First part: Individual bits for L3/L4 types */
XDP_RSS_L3_IPV4 = BIT(0),
@@ -444,14 +432,10 @@ enum xdp_rss_hash_type {
};
#ifdef CONFIG_NET
-u32 bpf_xdp_metadata_kfunc_id(int id);
-bool bpf_dev_bound_kfunc_id(u32 btf_id);
void xdp_set_features_flag(struct net_device *dev, xdp_features_t val);
void xdp_features_set_redirect_target(struct net_device *dev, bool support_sg);
void xdp_features_clear_redirect_target(struct net_device *dev);
#else
-static inline u32 bpf_xdp_metadata_kfunc_id(int id) { return 0; }
-static inline bool bpf_dev_bound_kfunc_id(u32 btf_id) { return false; }
static inline void
xdp_set_features_flag(struct net_device *dev, xdp_features_t val)
diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
index 8a26cd8814c1..235d81f7e0ed 100644
--- a/kernel/bpf/offload.c
+++ b/kernel/bpf/offload.c
@@ -844,9 +844,9 @@ void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id)
if (!ops)
goto out;
- if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_TIMESTAMP))
+ if (func_id == bpf_dev_bound_kfunc_id(XDP_METADATA_KFUNC_RX_TIMESTAMP))
p = ops->xmo_rx_timestamp;
- else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_HASH))
+ else if (func_id == bpf_dev_bound_kfunc_id(XDP_METADATA_KFUNC_RX_HASH))
p = ops->xmo_rx_hash;
out:
up_read(&bpf_devs_lock);
@@ -854,6 +854,28 @@ void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id)
return p;
}
+BTF_SET_START(dev_bound_kfunc_ids)
+#define NETDEV_METADATA_KFUNC(name, str) BTF_ID(func, str)
+XDP_METADATA_KFUNC_xxx
+#undef NETDEV_METADATA_KFUNC
+BTF_SET_END(dev_bound_kfunc_ids)
+
+BTF_ID_LIST(dev_bound_kfunc_ids_unsorted)
+#define NETDEV_METADATA_KFUNC(name, str) BTF_ID(func, str)
+XDP_METADATA_KFUNC_xxx
+#undef NETDEV_METADATA_KFUNC
+
+u32 bpf_dev_bound_kfunc_id(int id)
+{
+ /* dev_bound_kfunc_ids is sorted and can't be used */
+ return dev_bound_kfunc_ids_unsorted[id];
+}
+
+bool bpf_is_dev_bound_kfunc(u32 btf_id)
+{
+ return btf_id_set_contains(&dev_bound_kfunc_ids, btf_id);
+}
+
static int __init bpf_offload_init(void)
{
return rhashtable_init(&offdevs, &offdevs_params);
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 1e38584d497c..4db48b5af47e 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -2721,7 +2721,7 @@ static int add_kfunc_call(struct bpf_verifier_env *env, u32 func_id, s16 offset)
}
}
- if (bpf_dev_bound_kfunc_id(func_id)) {
+ if (bpf_is_dev_bound_kfunc(func_id)) {
err = bpf_dev_bound_kfunc_check(&env->log, prog_aux);
if (err)
return err;
@@ -17757,7 +17757,7 @@ static void specialize_kfunc(struct bpf_verifier_env *env,
void *xdp_kfunc;
bool is_rdonly;
- if (bpf_dev_bound_kfunc_id(func_id)) {
+ if (bpf_is_dev_bound_kfunc(func_id)) {
xdp_kfunc = bpf_dev_bound_resolve_kfunc(prog, func_id);
if (xdp_kfunc) {
*addr = (unsigned long)xdp_kfunc;
diff --git a/net/core/xdp.c b/net/core/xdp.c
index 41e5ca8643ec..819767697370 100644
--- a/net/core/xdp.c
+++ b/net/core/xdp.c
@@ -741,9 +741,9 @@ __bpf_kfunc int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, u32 *hash,
__diag_pop();
BTF_SET8_START(xdp_metadata_kfunc_ids)
-#define XDP_METADATA_KFUNC(_, name) BTF_ID_FLAGS(func, name, 0)
+#define NETDEV_METADATA_KFUNC(_, name) BTF_ID_FLAGS(func, name, 0)
XDP_METADATA_KFUNC_xxx
-#undef XDP_METADATA_KFUNC
+#undef NETDEV_METADATA_KFUNC
BTF_SET8_END(xdp_metadata_kfunc_ids)
static const struct btf_kfunc_id_set xdp_metadata_kfunc_set = {
@@ -751,22 +751,6 @@ static const struct btf_kfunc_id_set xdp_metadata_kfunc_set = {
.set = &xdp_metadata_kfunc_ids,
};
-BTF_ID_LIST(xdp_metadata_kfunc_ids_unsorted)
-#define XDP_METADATA_KFUNC(name, str) BTF_ID(func, str)
-XDP_METADATA_KFUNC_xxx
-#undef XDP_METADATA_KFUNC
-
-u32 bpf_xdp_metadata_kfunc_id(int id)
-{
- /* xdp_metadata_kfunc_ids is sorted and can't be used */
- return xdp_metadata_kfunc_ids_unsorted[id];
-}
-
-bool bpf_dev_bound_kfunc_id(u32 btf_id)
-{
- return btf_id_set8_contains(&xdp_metadata_kfunc_ids, btf_id);
-}
-
static int __init xdp_metadata_init(void)
{
return register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP, &xdp_metadata_kfunc_set);
--
2.41.0.162.gfafddb0af9-goog
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