[PATCH bpf-next v2 0/3] A couple of small refactorings of BPF program call sites

[PATCH bpf-next v2 0/3] A couple of small refactorings of BPF program call sites

[Toke Høiland-Jørgensen]

Stanislav suggested[0] that these small refactorings could be split out from the
XDP queueing RFC series and merged separately. The first change is a small
repacking of struct softnet_data, the others change the BPF call sites to
support full 64-bit values as arguments to bpf_redirect_map() and as the return
value of a BPF program, relying on the fact that BPF registers are always 64-bit
wide to maintain backwards compatibility.

Please see the individual patches for details.

v2:
- Rebase on bpf-next (CI failure seems to be unrelated to this series)
- Collect Stanislav's Reviewed-by

[0] https://lore.kernel.org/r/CAKH8qBtdnku7StcQ-SamadvAF==DRuLLZO94yOR1WJ9Bg=uX1w@mail.gmail.com

Kumar Kartikeya Dwivedi (1):
  bpf: Use 64-bit return value for bpf_prog_run

Toke Høiland-Jørgensen (2):
  dev: Move received_rps counter next to RPS members in softnet data
  bpf: Expand map key argument of bpf_redirect_map to u64

 include/linux/bpf-cgroup.h | 12 +++++-----
 include/linux/bpf.h        | 16 ++++++-------
 include/linux/filter.h     | 46 +++++++++++++++++++-------------------
 include/linux/netdevice.h  |  2 +-
 include/uapi/linux/bpf.h   |  2 +-
 kernel/bpf/cgroup.c        | 12 +++++-----
 kernel/bpf/core.c          | 14 ++++++------
 kernel/bpf/cpumap.c        |  4 ++--
 kernel/bpf/devmap.c        |  4 ++--
 kernel/bpf/offload.c       |  4 ++--
 kernel/bpf/verifier.c      |  2 +-
 net/bpf/test_run.c         | 21 +++++++++--------
 net/core/filter.c          |  4 ++--
 net/packet/af_packet.c     |  7 ++++--
 net/xdp/xskmap.c           |  4 ++--
 15 files changed, 80 insertions(+), 74 deletions(-)

-- 
2.37.2

[PATCH bpf-next v2 1/3] dev: Move received_rps counter next to RPS members in softnet data

[Toke Høiland-Jørgensen]

Move the received_rps counter value next to the other RPS-related members
in softnet_data. This closes two four-byte holes in the structure, making
room for another pointer in the first two cache lines without bumping the
xmit struct to its own line.

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
---
 include/linux/netdevice.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 1a3cb93c3dcc..fe9aeca2fce9 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -3100,7 +3100,6 @@ struct softnet_data {
 	/* stats */
 	unsigned int		processed;
 	unsigned int		time_squeeze;
-	unsigned int		received_rps;
 #ifdef CONFIG_RPS
 	struct softnet_data	*rps_ipi_list;
 #endif
@@ -3133,6 +3132,7 @@ struct softnet_data {
 	unsigned int		cpu;
 	unsigned int		input_queue_tail;
 #endif
+	unsigned int		received_rps;
 	unsigned int		dropped;
 	struct sk_buff_head	input_pkt_queue;
 	struct napi_struct	backlog;
-- 
2.37.2

[PATCH bpf-next v2 2/3] bpf: Expand map key argument of bpf_redirect_map to u64

[Toke Høiland-Jørgensen]

For queueing packets in XDP we want to add a new redirect map type with
support for 64-bit indexes. To prepare fore this, expand the width of the
'key' argument to the bpf_redirect_map() helper. Since BPF registers are
always 64-bit, this should be safe to do after the fact.

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
---
 include/linux/bpf.h      |  2 +-
 include/linux/filter.h   | 12 ++++++------
 include/uapi/linux/bpf.h |  2 +-
 kernel/bpf/cpumap.c      |  4 ++--
 kernel/bpf/devmap.c      |  4 ++--
 kernel/bpf/verifier.c    |  2 +-
 net/core/filter.c        |  4 ++--
 net/xdp/xskmap.c         |  4 ++--
 8 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 9c1674973e03..222cba23e6d9 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -134,7 +134,7 @@ struct bpf_map_ops {
 	struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
 
 	/* Misc helpers.*/
-	int (*map_redirect)(struct bpf_map *map, u32 ifindex, u64 flags);
+	int (*map_redirect)(struct bpf_map *map, u64 key, u64 flags);
 
 	/* map_meta_equal must be implemented for maps that can be
 	 * used as an inner map.  It is a runtime check to ensure
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 527ae1d64e27..eff295509f03 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -637,13 +637,13 @@ struct bpf_nh_params {
 };
 
 struct bpf_redirect_info {
-	u32 flags;
-	u32 tgt_index;
+	u64 tgt_index;
 	void *tgt_value;
 	struct bpf_map *map;
+	u32 flags;
+	u32 kern_flags;
 	u32 map_id;
 	enum bpf_map_type map_type;
-	u32 kern_flags;
 	struct bpf_nh_params nh;
 };
 
@@ -1493,7 +1493,7 @@ static inline bool bpf_sk_lookup_run_v6(struct net *net, int protocol,
 }
 #endif /* IS_ENABLED(CONFIG_IPV6) */
 
-static __always_inline int __bpf_xdp_redirect_map(struct bpf_map *map, u32 ifindex,
+static __always_inline int __bpf_xdp_redirect_map(struct bpf_map *map, u64 index,
 						  u64 flags, const u64 flag_mask,
 						  void *lookup_elem(struct bpf_map *map, u32 key))
 {
@@ -1504,7 +1504,7 @@ static __always_inline int __bpf_xdp_redirect_map(struct bpf_map *map, u32 ifind
 	if (unlikely(flags & ~(action_mask | flag_mask)))
 		return XDP_ABORTED;
 
-	ri->tgt_value = lookup_elem(map, ifindex);
+	ri->tgt_value = lookup_elem(map, index);
 	if (unlikely(!ri->tgt_value) && !(flags & BPF_F_BROADCAST)) {
 		/* If the lookup fails we want to clear out the state in the
 		 * redirect_info struct completely, so that if an eBPF program
@@ -1516,7 +1516,7 @@ static __always_inline int __bpf_xdp_redirect_map(struct bpf_map *map, u32 ifind
 		return flags & action_mask;
 	}
 
-	ri->tgt_index = ifindex;
+	ri->tgt_index = index;
 	ri->map_id = map->id;
 	ri->map_type = map->map_type;
 
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 837c0f9b7fdd..c6d37ac2b87c 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -2629,7 +2629,7 @@ union bpf_attr {
  * 	Return
  * 		0 on success, or a negative error in case of failure.
  *
- * long bpf_redirect_map(struct bpf_map *map, u32 key, u64 flags)
+ * long bpf_redirect_map(struct bpf_map *map, u64 key, u64 flags)
  * 	Description
  * 		Redirect the packet to the endpoint referenced by *map* at
  * 		index *key*. Depending on its type, this *map* can contain
diff --git a/kernel/bpf/cpumap.c b/kernel/bpf/cpumap.c
index b5ba34ddd4b6..39ed08a2bb52 100644
--- a/kernel/bpf/cpumap.c
+++ b/kernel/bpf/cpumap.c
@@ -668,9 +668,9 @@ static int cpu_map_get_next_key(struct bpf_map *map, void *key, void *next_key)
 	return 0;
 }
 
-static int cpu_map_redirect(struct bpf_map *map, u32 ifindex, u64 flags)
+static int cpu_map_redirect(struct bpf_map *map, u64 index, u64 flags)
 {
-	return __bpf_xdp_redirect_map(map, ifindex, flags, 0,
+	return __bpf_xdp_redirect_map(map, index, flags, 0,
 				      __cpu_map_lookup_elem);
 }
 
diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
index f9a87dcc5535..d01e4c55b376 100644
--- a/kernel/bpf/devmap.c
+++ b/kernel/bpf/devmap.c
@@ -992,14 +992,14 @@ static int dev_map_hash_update_elem(struct bpf_map *map, void *key, void *value,
 					 map, key, value, map_flags);
 }
 
-static int dev_map_redirect(struct bpf_map *map, u32 ifindex, u64 flags)
+static int dev_map_redirect(struct bpf_map *map, u64 ifindex, u64 flags)
 {
 	return __bpf_xdp_redirect_map(map, ifindex, flags,
 				      BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS,
 				      __dev_map_lookup_elem);
 }
 
-static int dev_hash_map_redirect(struct bpf_map *map, u32 ifindex, u64 flags)
+static int dev_hash_map_redirect(struct bpf_map *map, u64 ifindex, u64 flags)
 {
 	return __bpf_xdp_redirect_map(map, ifindex, flags,
 				      BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS,
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 068b20ed34d2..844a44694b6f 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -14169,7 +14169,7 @@ static int do_misc_fixups(struct bpf_verifier_env *env)
 			BUILD_BUG_ON(!__same_type(ops->map_peek_elem,
 				     (int (*)(struct bpf_map *map, void *value))NULL));
 			BUILD_BUG_ON(!__same_type(ops->map_redirect,
-				     (int (*)(struct bpf_map *map, u32 ifindex, u64 flags))NULL));
+				     (int (*)(struct bpf_map *map, u64 index, u64 flags))NULL));
 			BUILD_BUG_ON(!__same_type(ops->map_for_each_callback,
 				     (int (*)(struct bpf_map *map,
 					      bpf_callback_t callback_fn,
diff --git a/net/core/filter.c b/net/core/filter.c
index ee768bb5b5ab..285eaee2b373 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4408,10 +4408,10 @@ static const struct bpf_func_proto bpf_xdp_redirect_proto = {
 	.arg2_type      = ARG_ANYTHING,
 };
 
-BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex,
+BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u64, key,
 	   u64, flags)
 {
-	return map->ops->map_redirect(map, ifindex, flags);
+	return map->ops->map_redirect(map, key, flags);
 }
 
 static const struct bpf_func_proto bpf_xdp_redirect_map_proto = {
diff --git a/net/xdp/xskmap.c b/net/xdp/xskmap.c
index acc8e52a4f5f..771d0fa90ef5 100644
--- a/net/xdp/xskmap.c
+++ b/net/xdp/xskmap.c
@@ -231,9 +231,9 @@ static int xsk_map_delete_elem(struct bpf_map *map, void *key)
 	return 0;
 }
 
-static int xsk_map_redirect(struct bpf_map *map, u32 ifindex, u64 flags)
+static int xsk_map_redirect(struct bpf_map *map, u64 index, u64 flags)
 {
-	return __bpf_xdp_redirect_map(map, ifindex, flags, 0,
+	return __bpf_xdp_redirect_map(map, index, flags, 0,
 				      __xsk_map_lookup_elem);
 }
 
-- 
2.37.2

[PATCH bpf-next v2 3/3] bpf: Use 64-bit return value for bpf_prog_run

[Toke Høiland-Jørgensen]

From: Kumar Kartikeya Dwivedi <memxor@gmail.com>

BPF ABI always uses 64-bit return value, but so far __bpf_prog_run and
higher level wrappers always truncated the return value to 32-bit. We want
to be able to introduce a new BPF program type that returns a PTR_TO_BTF_ID
or NULL from the BPF program to the caller context in the kernel. To be
able to use this returned pointer value, the bpf_prog_run invocation needs
to be able to return a 64-bit value, so update the definitions to allow
this.

To avoid code churn in the whole kernel, we let the compiler handle
truncation normally, and allow new call sites to utilize the 64-bit
return value, by receiving the return value as a u64.

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
---
 include/linux/bpf-cgroup.h | 12 ++++++------
 include/linux/bpf.h        | 14 +++++++-------
 include/linux/filter.h     | 34 +++++++++++++++++-----------------
 kernel/bpf/cgroup.c        | 12 ++++++------
 kernel/bpf/core.c          | 14 +++++++-------
 kernel/bpf/offload.c       |  4 ++--
 net/bpf/test_run.c         | 21 ++++++++++++---------
 net/packet/af_packet.c     |  7 +++++--
 8 files changed, 62 insertions(+), 56 deletions(-)

diff --git a/include/linux/bpf-cgroup.h b/include/linux/bpf-cgroup.h
index 57e9e109257e..85ae187e5d41 100644
--- a/include/linux/bpf-cgroup.h
+++ b/include/linux/bpf-cgroup.h
@@ -23,12 +23,12 @@ struct ctl_table;
 struct ctl_table_header;
 struct task_struct;
 
-unsigned int __cgroup_bpf_run_lsm_sock(const void *ctx,
-				       const struct bpf_insn *insn);
-unsigned int __cgroup_bpf_run_lsm_socket(const void *ctx,
-					 const struct bpf_insn *insn);
-unsigned int __cgroup_bpf_run_lsm_current(const void *ctx,
-					  const struct bpf_insn *insn);
+u64 __cgroup_bpf_run_lsm_sock(const void *ctx,
+			      const struct bpf_insn *insn);
+u64 __cgroup_bpf_run_lsm_socket(const void *ctx,
+				const struct bpf_insn *insn);
+u64 __cgroup_bpf_run_lsm_current(const void *ctx,
+				 const struct bpf_insn *insn);
 
 #ifdef CONFIG_CGROUP_BPF
 
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 222cba23e6d9..f32f33f5c827 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -58,8 +58,8 @@ typedef u64 (*bpf_callback_t)(u64, u64, u64, u64, u64);
 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
 					struct bpf_iter_aux_info *aux);
 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
-typedef unsigned int (*bpf_func_t)(const void *,
-				   const struct bpf_insn *);
+typedef u64 (*bpf_func_t)(const void *,
+			  const struct bpf_insn *);
 struct bpf_iter_seq_info {
 	const struct seq_operations *seq_ops;
 	bpf_iter_init_seq_priv_t init_seq_private;
@@ -896,7 +896,7 @@ struct bpf_dispatcher {
 	struct bpf_ksym ksym;
 };
 
-static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func(
+static __always_inline __nocfi u64 bpf_dispatcher_nop_func(
 	const void *ctx,
 	const struct bpf_insn *insnsi,
 	bpf_func_t bpf_func)
@@ -925,7 +925,7 @@ int arch_prepare_bpf_dispatcher(void *image, s64 *funcs, int num_funcs);
 }
 
 #define DEFINE_BPF_DISPATCHER(name)					\
-	noinline __nocfi unsigned int bpf_dispatcher_##name##_func(	\
+	noinline __nocfi u64 bpf_dispatcher_##name##_func(		\
 		const void *ctx,					\
 		const struct bpf_insn *insnsi,				\
 		bpf_func_t bpf_func)					\
@@ -936,7 +936,7 @@ int arch_prepare_bpf_dispatcher(void *image, s64 *funcs, int num_funcs);
 	struct bpf_dispatcher bpf_dispatcher_##name =			\
 		BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
 #define DECLARE_BPF_DISPATCHER(name)					\
-	unsigned int bpf_dispatcher_##name##_func(			\
+	u64 bpf_dispatcher_##name##_func(				\
 		const void *ctx,					\
 		const struct bpf_insn *insnsi,				\
 		bpf_func_t bpf_func);					\
@@ -1140,7 +1140,7 @@ struct bpf_prog {
 	u8			tag[BPF_TAG_SIZE];
 	struct bpf_prog_stats __percpu *stats;
 	int __percpu		*active;
-	unsigned int		(*bpf_func)(const void *ctx,
+	u64			(*bpf_func)(const void *ctx,
 					    const struct bpf_insn *insn);
 	struct bpf_prog_aux	*aux;		/* Auxiliary fields */
 	struct sock_fprog_kern	*orig_prog;	/* Original BPF program */
@@ -1489,7 +1489,7 @@ static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
 /* BPF program asks to set CN on the packet. */
 #define BPF_RET_SET_CN						(1 << 0)
 
-typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
+typedef u64 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
 
 static __always_inline u32
 bpf_prog_run_array(const struct bpf_prog_array *array,
diff --git a/include/linux/filter.h b/include/linux/filter.h
index eff295509f03..d6c2deffdcc3 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -567,16 +567,16 @@ struct sk_filter {
 
 DECLARE_STATIC_KEY_FALSE(bpf_stats_enabled_key);
 
-typedef unsigned int (*bpf_dispatcher_fn)(const void *ctx,
-					  const struct bpf_insn *insnsi,
-					  unsigned int (*bpf_func)(const void *,
-								   const struct bpf_insn *));
+typedef u64 (*bpf_dispatcher_fn)(const void *ctx,
+				 const struct bpf_insn *insnsi,
+				 u64 (*bpf_func)(const void *,
+						 const struct bpf_insn *));
 
-static __always_inline u32 __bpf_prog_run(const struct bpf_prog *prog,
+static __always_inline u64 __bpf_prog_run(const struct bpf_prog *prog,
 					  const void *ctx,
 					  bpf_dispatcher_fn dfunc)
 {
-	u32 ret;
+	u64 ret;
 
 	cant_migrate();
 	if (static_branch_unlikely(&bpf_stats_enabled_key)) {
@@ -596,7 +596,7 @@ static __always_inline u32 __bpf_prog_run(const struct bpf_prog *prog,
 	return ret;
 }
 
-static __always_inline u32 bpf_prog_run(const struct bpf_prog *prog, const void *ctx)
+static __always_inline u64 bpf_prog_run(const struct bpf_prog *prog, const void *ctx)
 {
 	return __bpf_prog_run(prog, ctx, bpf_dispatcher_nop_func);
 }
@@ -609,10 +609,10 @@ static __always_inline u32 bpf_prog_run(const struct bpf_prog *prog, const void
  * invocation of a BPF program does not require reentrancy protection
  * against a BPF program which is invoked from a preempting task.
  */
-static inline u32 bpf_prog_run_pin_on_cpu(const struct bpf_prog *prog,
+static inline u64 bpf_prog_run_pin_on_cpu(const struct bpf_prog *prog,
 					  const void *ctx)
 {
-	u32 ret;
+	u64 ret;
 
 	migrate_disable();
 	ret = bpf_prog_run(prog, ctx);
@@ -708,13 +708,13 @@ static inline u8 *bpf_skb_cb(const struct sk_buff *skb)
 }
 
 /* Must be invoked with migration disabled */
-static inline u32 __bpf_prog_run_save_cb(const struct bpf_prog *prog,
+static inline u64 __bpf_prog_run_save_cb(const struct bpf_prog *prog,
 					 const void *ctx)
 {
 	const struct sk_buff *skb = ctx;
 	u8 *cb_data = bpf_skb_cb(skb);
 	u8 cb_saved[BPF_SKB_CB_LEN];
-	u32 res;
+	u64 res;
 
 	if (unlikely(prog->cb_access)) {
 		memcpy(cb_saved, cb_data, sizeof(cb_saved));
@@ -729,10 +729,10 @@ static inline u32 __bpf_prog_run_save_cb(const struct bpf_prog *prog,
 	return res;
 }
 
-static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog,
+static inline u64 bpf_prog_run_save_cb(const struct bpf_prog *prog,
 				       struct sk_buff *skb)
 {
-	u32 res;
+	u64 res;
 
 	migrate_disable();
 	res = __bpf_prog_run_save_cb(prog, skb);
@@ -740,11 +740,11 @@ static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog,
 	return res;
 }
 
-static inline u32 bpf_prog_run_clear_cb(const struct bpf_prog *prog,
+static inline u64 bpf_prog_run_clear_cb(const struct bpf_prog *prog,
 					struct sk_buff *skb)
 {
 	u8 *cb_data = bpf_skb_cb(skb);
-	u32 res;
+	u64 res;
 
 	if (unlikely(prog->cb_access))
 		memset(cb_data, 0, BPF_SKB_CB_LEN);
@@ -759,14 +759,14 @@ DECLARE_STATIC_KEY_FALSE(bpf_master_redirect_enabled_key);
 
 u32 xdp_master_redirect(struct xdp_buff *xdp);
 
-static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog,
+static __always_inline u64 bpf_prog_run_xdp(const struct bpf_prog *prog,
 					    struct xdp_buff *xdp)
 {
 	/* Driver XDP hooks are invoked within a single NAPI poll cycle and thus
 	 * under local_bh_disable(), which provides the needed RCU protection
 	 * for accessing map entries.
 	 */
-	u32 act = __bpf_prog_run(prog, xdp, BPF_DISPATCHER_FUNC(xdp));
+	u64 act = __bpf_prog_run(prog, xdp, BPF_DISPATCHER_FUNC(xdp));
 
 	if (static_branch_unlikely(&bpf_master_redirect_enabled_key)) {
 		if (act == XDP_TX && netif_is_bond_slave(xdp->rxq->dev))
diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index 121b5a5edb64..9dffd786b541 100644
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -63,8 +63,8 @@ bpf_prog_run_array_cg(const struct cgroup_bpf *cgrp,
 	return run_ctx.retval;
 }
 
-unsigned int __cgroup_bpf_run_lsm_sock(const void *ctx,
-				       const struct bpf_insn *insn)
+u64 __cgroup_bpf_run_lsm_sock(const void *ctx,
+			      const struct bpf_insn *insn)
 {
 	const struct bpf_prog *shim_prog;
 	struct sock *sk;
@@ -85,8 +85,8 @@ unsigned int __cgroup_bpf_run_lsm_sock(const void *ctx,
 	return ret;
 }
 
-unsigned int __cgroup_bpf_run_lsm_socket(const void *ctx,
-					 const struct bpf_insn *insn)
+u64 __cgroup_bpf_run_lsm_socket(const void *ctx,
+				const struct bpf_insn *insn)
 {
 	const struct bpf_prog *shim_prog;
 	struct socket *sock;
@@ -107,8 +107,8 @@ unsigned int __cgroup_bpf_run_lsm_socket(const void *ctx,
 	return ret;
 }
 
-unsigned int __cgroup_bpf_run_lsm_current(const void *ctx,
-					  const struct bpf_insn *insn)
+u64 __cgroup_bpf_run_lsm_current(const void *ctx,
+				 const struct bpf_insn *insn)
 {
 	const struct bpf_prog *shim_prog;
 	struct cgroup *cgrp;
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 639437f36928..7549d765f7b6 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -1999,7 +1999,7 @@ static u64 ___bpf_prog_run(u64 *regs, const struct bpf_insn *insn)
 
 #define PROG_NAME(stack_size) __bpf_prog_run##stack_size
 #define DEFINE_BPF_PROG_RUN(stack_size) \
-static unsigned int PROG_NAME(stack_size)(const void *ctx, const struct bpf_insn *insn) \
+static u64 PROG_NAME(stack_size)(const void *ctx, const struct bpf_insn *insn) \
 { \
 	u64 stack[stack_size / sizeof(u64)]; \
 	u64 regs[MAX_BPF_EXT_REG]; \
@@ -2043,8 +2043,8 @@ EVAL4(DEFINE_BPF_PROG_RUN_ARGS, 416, 448, 480, 512);
 
 #define PROG_NAME_LIST(stack_size) PROG_NAME(stack_size),
 
-static unsigned int (*interpreters[])(const void *ctx,
-				      const struct bpf_insn *insn) = {
+static u64 (*interpreters[])(const void *ctx,
+			     const struct bpf_insn *insn) = {
 EVAL6(PROG_NAME_LIST, 32, 64, 96, 128, 160, 192)
 EVAL6(PROG_NAME_LIST, 224, 256, 288, 320, 352, 384)
 EVAL4(PROG_NAME_LIST, 416, 448, 480, 512)
@@ -2069,8 +2069,8 @@ void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth)
 }
 
 #else
-static unsigned int __bpf_prog_ret0_warn(const void *ctx,
-					 const struct bpf_insn *insn)
+static u64 __bpf_prog_ret0_warn(const void *ctx,
+				const struct bpf_insn *insn)
 {
 	/* If this handler ever gets executed, then BPF_JIT_ALWAYS_ON
 	 * is not working properly, so warn about it!
@@ -2205,8 +2205,8 @@ struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err)
 }
 EXPORT_SYMBOL_GPL(bpf_prog_select_runtime);
 
-static unsigned int __bpf_prog_ret1(const void *ctx,
-				    const struct bpf_insn *insn)
+static u64 __bpf_prog_ret1(const void *ctx,
+			   const struct bpf_insn *insn)
 {
 	return 1;
 }
diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
index 13e4efc971e6..d6a37ab87511 100644
--- a/kernel/bpf/offload.c
+++ b/kernel/bpf/offload.c
@@ -246,8 +246,8 @@ static int bpf_prog_offload_translate(struct bpf_prog *prog)
 	return ret;
 }
 
-static unsigned int bpf_prog_warn_on_exec(const void *ctx,
-					  const struct bpf_insn *insn)
+static u64 bpf_prog_warn_on_exec(const void *ctx,
+				 const struct bpf_insn *insn)
 {
 	WARN(1, "attempt to execute device eBPF program on the host!");
 	return 0;
diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index 25d8ecf105aa..f0827d8690f1 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -370,7 +370,7 @@ static int bpf_test_run_xdp_live(struct bpf_prog *prog, struct xdp_buff *ctx,
 }
 
 static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
-			u32 *retval, u32 *time, bool xdp)
+			u64 *retval, u32 *time, bool xdp)
 {
 	struct bpf_prog_array_item item = {.prog = prog};
 	struct bpf_run_ctx *old_ctx;
@@ -757,7 +757,7 @@ int bpf_prog_test_run_tracing(struct bpf_prog *prog,
 	struct bpf_fentry_test_t arg = {};
 	u16 side_effect = 0, ret = 0;
 	int b = 2, err = -EFAULT;
-	u32 retval = 0;
+	u64 retval = 0;
 
 	if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
 		return -EINVAL;
@@ -797,7 +797,7 @@ int bpf_prog_test_run_tracing(struct bpf_prog *prog,
 struct bpf_raw_tp_test_run_info {
 	struct bpf_prog *prog;
 	void *ctx;
-	u32 retval;
+	u64 retval;
 };
 
 static void
@@ -1045,15 +1045,15 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
 			  union bpf_attr __user *uattr)
 {
 	bool is_l2 = false, is_direct_pkt_access = false;
+	u32 size = kattr->test.data_size_in, duration;
 	struct net *net = current->nsproxy->net_ns;
 	struct net_device *dev = net->loopback_dev;
-	u32 size = kattr->test.data_size_in;
 	u32 repeat = kattr->test.repeat;
 	struct __sk_buff *ctx = NULL;
-	u32 retval, duration;
 	int hh_len = ETH_HLEN;
 	struct sk_buff *skb;
 	struct sock *sk;
+	u64 retval;
 	void *data;
 	int ret;
 
@@ -1241,15 +1241,16 @@ int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
 	bool do_live = (kattr->test.flags & BPF_F_TEST_XDP_LIVE_FRAMES);
 	u32 tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
 	u32 batch_size = kattr->test.batch_size;
-	u32 retval = 0, duration, max_data_sz;
 	u32 size = kattr->test.data_size_in;
 	u32 headroom = XDP_PACKET_HEADROOM;
 	u32 repeat = kattr->test.repeat;
 	struct netdev_rx_queue *rxqueue;
 	struct skb_shared_info *sinfo;
+	u32 duration, max_data_sz;
 	struct xdp_buff xdp = {};
 	int i, ret = -EINVAL;
 	struct xdp_md *ctx;
+	u64 retval = 0;
 	void *data;
 
 	if (prog->expected_attach_type == BPF_XDP_DEVMAP ||
@@ -1407,7 +1408,8 @@ int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
 	struct bpf_flow_keys flow_keys;
 	const struct ethhdr *eth;
 	unsigned int flags = 0;
-	u32 retval, duration;
+	u32 duration;
+	u64 retval;
 	void *data;
 	int ret;
 
@@ -1472,8 +1474,9 @@ int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, const union bpf_attr *kat
 	struct bpf_sk_lookup_kern ctx = {};
 	u32 repeat = kattr->test.repeat;
 	struct bpf_sk_lookup *user_ctx;
-	u32 retval, duration;
 	int ret = -EINVAL;
+	u32 duration;
+	u64 retval;
 
 	if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
 		return -EINVAL;
@@ -1571,8 +1574,8 @@ int bpf_prog_test_run_syscall(struct bpf_prog *prog,
 	void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in);
 	__u32 ctx_size_in = kattr->test.ctx_size_in;
 	void *ctx = NULL;
-	u32 retval;
 	int err = 0;
+	u64 retval;
 
 	/* doesn't support data_in/out, ctx_out, duration, or repeat or flags */
 	if (kattr->test.data_in || kattr->test.data_out ||
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 5cbe07116e04..bc4d9ff6f91c 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1444,8 +1444,11 @@ static unsigned int fanout_demux_bpf(struct packet_fanout *f,
 
 	rcu_read_lock();
 	prog = rcu_dereference(f->bpf_prog);
-	if (prog)
-		ret = bpf_prog_run_clear_cb(prog, skb) % num;
+	if (prog) {
+		ret = bpf_prog_run_clear_cb(prog, skb);
+		/* For some architectures, we need to do modulus in 32-bit width */
+		ret %= num;
+	}
 	rcu_read_unlock();
 
 	return ret;
-- 
2.37.2

Re: [PATCH bpf-next v2 1/3] dev: Move received_rps counter next to RPS members in softnet data

[Song Liu]

On Mon, Sep 5, 2022 at 12:34 PM Toke Høiland-Jørgensen <toke@redhat.com> wrote:
>
> Move the received_rps counter value next to the other RPS-related members
> in softnet_data. This closes two four-byte holes in the structure, making
> room for another pointer in the first two cache lines without bumping the
> xmit struct to its own line.
>
> Reviewed-by: Stanislav Fomichev <sdf@google.com>
> Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>

Acked-by: Song Liu <song@kernel.org>

> ---
>  include/linux/netdevice.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 1a3cb93c3dcc..fe9aeca2fce9 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -3100,7 +3100,6 @@ struct softnet_data {
>         /* stats */
>         unsigned int            processed;
>         unsigned int            time_squeeze;
> -       unsigned int            received_rps;
>  #ifdef CONFIG_RPS
>         struct softnet_data     *rps_ipi_list;
>  #endif
> @@ -3133,6 +3132,7 @@ struct softnet_data {
>         unsigned int            cpu;
>         unsigned int            input_queue_tail;
>  #endif
> +       unsigned int            received_rps;
>         unsigned int            dropped;
>         struct sk_buff_head     input_pkt_queue;
>         struct napi_struct      backlog;
> --
> 2.37.2
>

Re: [PATCH bpf-next v2 2/3] bpf: Expand map key argument of bpf_redirect_map to u64

[Song Liu]

On Mon, Sep 5, 2022 at 12:34 PM Toke Høiland-Jørgensen <toke@redhat.com> wrote:
>
> For queueing packets in XDP we want to add a new redirect map type with
> support for 64-bit indexes. To prepare fore this, expand the width of the
> 'key' argument to the bpf_redirect_map() helper. Since BPF registers are
> always 64-bit, this should be safe to do after the fact.
>
> Reviewed-by: Stanislav Fomichev <sdf@google.com>
> Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>

Acked-by: Song Liu <song@kernel.org>

> ---
>  include/linux/bpf.h      |  2 +-
>  include/linux/filter.h   | 12 ++++++------
>  include/uapi/linux/bpf.h |  2 +-
>  kernel/bpf/cpumap.c      |  4 ++--
>  kernel/bpf/devmap.c      |  4 ++--
>  kernel/bpf/verifier.c    |  2 +-
>  net/core/filter.c        |  4 ++--
>  net/xdp/xskmap.c         |  4 ++--
>  8 files changed, 17 insertions(+), 17 deletions(-)
>
> diff --git a/include/linux/bpf.h b/include/linux/bpf.h
> index 9c1674973e03..222cba23e6d9 100644
> --- a/include/linux/bpf.h
> +++ b/include/linux/bpf.h
> @@ -134,7 +134,7 @@ struct bpf_map_ops {
>         struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
>
>         /* Misc helpers.*/
> -       int (*map_redirect)(struct bpf_map *map, u32 ifindex, u64 flags);
> +       int (*map_redirect)(struct bpf_map *map, u64 key, u64 flags);
>
>         /* map_meta_equal must be implemented for maps that can be
>          * used as an inner map.  It is a runtime check to ensure
> diff --git a/include/linux/filter.h b/include/linux/filter.h
> index 527ae1d64e27..eff295509f03 100644
> --- a/include/linux/filter.h
> +++ b/include/linux/filter.h
> @@ -637,13 +637,13 @@ struct bpf_nh_params {
>  };
>
>  struct bpf_redirect_info {
> -       u32 flags;
> -       u32 tgt_index;
> +       u64 tgt_index;
>         void *tgt_value;
>         struct bpf_map *map;
> +       u32 flags;
> +       u32 kern_flags;
>         u32 map_id;
>         enum bpf_map_type map_type;
> -       u32 kern_flags;
>         struct bpf_nh_params nh;
>  };
>
> @@ -1493,7 +1493,7 @@ static inline bool bpf_sk_lookup_run_v6(struct net *net, int protocol,
>  }
>  #endif /* IS_ENABLED(CONFIG_IPV6) */
>
> -static __always_inline int __bpf_xdp_redirect_map(struct bpf_map *map, u32 ifindex,
> +static __always_inline int __bpf_xdp_redirect_map(struct bpf_map *map, u64 index,
>                                                   u64 flags, const u64 flag_mask,
>                                                   void *lookup_elem(struct bpf_map *map, u32 key))
>  {
> @@ -1504,7 +1504,7 @@ static __always_inline int __bpf_xdp_redirect_map(struct bpf_map *map, u32 ifind
>         if (unlikely(flags & ~(action_mask | flag_mask)))
>                 return XDP_ABORTED;
>
> -       ri->tgt_value = lookup_elem(map, ifindex);
> +       ri->tgt_value = lookup_elem(map, index);
>         if (unlikely(!ri->tgt_value) && !(flags & BPF_F_BROADCAST)) {
>                 /* If the lookup fails we want to clear out the state in the
>                  * redirect_info struct completely, so that if an eBPF program
> @@ -1516,7 +1516,7 @@ static __always_inline int __bpf_xdp_redirect_map(struct bpf_map *map, u32 ifind
>                 return flags & action_mask;
>         }
>
> -       ri->tgt_index = ifindex;
> +       ri->tgt_index = index;
>         ri->map_id = map->id;
>         ri->map_type = map->map_type;
>
> diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> index 837c0f9b7fdd..c6d37ac2b87c 100644
> --- a/include/uapi/linux/bpf.h
> +++ b/include/uapi/linux/bpf.h
> @@ -2629,7 +2629,7 @@ union bpf_attr {
>   *     Return
>   *             0 on success, or a negative error in case of failure.
>   *
> - * long bpf_redirect_map(struct bpf_map *map, u32 key, u64 flags)
> + * long bpf_redirect_map(struct bpf_map *map, u64 key, u64 flags)
>   *     Description
>   *             Redirect the packet to the endpoint referenced by *map* at
>   *             index *key*. Depending on its type, this *map* can contain
> diff --git a/kernel/bpf/cpumap.c b/kernel/bpf/cpumap.c
> index b5ba34ddd4b6..39ed08a2bb52 100644
> --- a/kernel/bpf/cpumap.c
> +++ b/kernel/bpf/cpumap.c
> @@ -668,9 +668,9 @@ static int cpu_map_get_next_key(struct bpf_map *map, void *key, void *next_key)
>         return 0;
>  }
>
> -static int cpu_map_redirect(struct bpf_map *map, u32 ifindex, u64 flags)
> +static int cpu_map_redirect(struct bpf_map *map, u64 index, u64 flags)
>  {
> -       return __bpf_xdp_redirect_map(map, ifindex, flags, 0,
> +       return __bpf_xdp_redirect_map(map, index, flags, 0,
>                                       __cpu_map_lookup_elem);
>  }
>
> diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
> index f9a87dcc5535..d01e4c55b376 100644
> --- a/kernel/bpf/devmap.c
> +++ b/kernel/bpf/devmap.c
> @@ -992,14 +992,14 @@ static int dev_map_hash_update_elem(struct bpf_map *map, void *key, void *value,
>                                          map, key, value, map_flags);
>  }
>
> -static int dev_map_redirect(struct bpf_map *map, u32 ifindex, u64 flags)
> +static int dev_map_redirect(struct bpf_map *map, u64 ifindex, u64 flags)
>  {
>         return __bpf_xdp_redirect_map(map, ifindex, flags,
>                                       BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS,
>                                       __dev_map_lookup_elem);
>  }
>
> -static int dev_hash_map_redirect(struct bpf_map *map, u32 ifindex, u64 flags)
> +static int dev_hash_map_redirect(struct bpf_map *map, u64 ifindex, u64 flags)
>  {
>         return __bpf_xdp_redirect_map(map, ifindex, flags,
>                                       BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS,
> diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
> index 068b20ed34d2..844a44694b6f 100644
> --- a/kernel/bpf/verifier.c
> +++ b/kernel/bpf/verifier.c
> @@ -14169,7 +14169,7 @@ static int do_misc_fixups(struct bpf_verifier_env *env)
>                         BUILD_BUG_ON(!__same_type(ops->map_peek_elem,
>                                      (int (*)(struct bpf_map *map, void *value))NULL));
>                         BUILD_BUG_ON(!__same_type(ops->map_redirect,
> -                                    (int (*)(struct bpf_map *map, u32 ifindex, u64 flags))NULL));
> +                                    (int (*)(struct bpf_map *map, u64 index, u64 flags))NULL));
>                         BUILD_BUG_ON(!__same_type(ops->map_for_each_callback,
>                                      (int (*)(struct bpf_map *map,
>                                               bpf_callback_t callback_fn,
> diff --git a/net/core/filter.c b/net/core/filter.c
> index ee768bb5b5ab..285eaee2b373 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -4408,10 +4408,10 @@ static const struct bpf_func_proto bpf_xdp_redirect_proto = {
>         .arg2_type      = ARG_ANYTHING,
>  };
>
> -BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex,
> +BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u64, key,
>            u64, flags)
>  {
> -       return map->ops->map_redirect(map, ifindex, flags);
> +       return map->ops->map_redirect(map, key, flags);
>  }
>
>  static const struct bpf_func_proto bpf_xdp_redirect_map_proto = {
> diff --git a/net/xdp/xskmap.c b/net/xdp/xskmap.c
> index acc8e52a4f5f..771d0fa90ef5 100644
> --- a/net/xdp/xskmap.c
> +++ b/net/xdp/xskmap.c
> @@ -231,9 +231,9 @@ static int xsk_map_delete_elem(struct bpf_map *map, void *key)
>         return 0;
>  }
>
> -static int xsk_map_redirect(struct bpf_map *map, u32 ifindex, u64 flags)
> +static int xsk_map_redirect(struct bpf_map *map, u64 index, u64 flags)
>  {
> -       return __bpf_xdp_redirect_map(map, ifindex, flags, 0,
> +       return __bpf_xdp_redirect_map(map, index, flags, 0,
>                                       __xsk_map_lookup_elem);
>  }
>
> --
> 2.37.2
>

Re: [PATCH bpf-next v2 3/3] bpf: Use 64-bit return value for bpf_prog_run

[Song Liu]

On Mon, Sep 5, 2022 at 12:34 PM Toke Høiland-Jørgensen <toke@redhat.com> wrote:
>
> From: Kumar Kartikeya Dwivedi <memxor@gmail.com>
>
> BPF ABI always uses 64-bit return value, but so far __bpf_prog_run and
> higher level wrappers always truncated the return value to 32-bit. We want
> to be able to introduce a new BPF program type that returns a PTR_TO_BTF_ID
> or NULL from the BPF program to the caller context in the kernel. To be
> able to use this returned pointer value, the bpf_prog_run invocation needs
> to be able to return a 64-bit value, so update the definitions to allow
> this.
>
> To avoid code churn in the whole kernel, we let the compiler handle
> truncation normally, and allow new call sites to utilize the 64-bit
> return value, by receiving the return value as a u64.
>
> Reviewed-by: Stanislav Fomichev <sdf@google.com>
> Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
> Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>

Acked-by: Song Liu <song@kernel.org>

Re: [PATCH bpf-next v2 0/3] A couple of small refactorings of BPF program call sites

[Daniel Borkmann]

On 9/5/22 9:33 PM, Toke Høiland-Jørgensen wrote:
> Stanislav suggested[0] that these small refactorings could be split out from the
> XDP queueing RFC series and merged separately. The first change is a small
> repacking of struct softnet_data, the others change the BPF call sites to
> support full 64-bit values as arguments to bpf_redirect_map() and as the return
> value of a BPF program, relying on the fact that BPF registers are always 64-bit
> wide to maintain backwards compatibility.

Looks like might still be issues on s390 [0] around retval checking, e.g.:

   [...]
   #122     pe_preserve_elems:FAIL
   test_raw_tp_test_run:PASS:parse_cpu_mask_file 0 nsec
   test_raw_tp_test_run:PASS:skel_open 0 nsec
   test_raw_tp_test_run:PASS:skel_attach 0 nsec
   test_raw_tp_test_run:PASS:open /proc/self/comm 0 nsec
   test_raw_tp_test_run:PASS:task rename 0 nsec
   test_raw_tp_test_run:PASS:check_count 0 nsec
   test_raw_tp_test_run:PASS:check_on_cpu 0 nsec
   test_raw_tp_test_run:PASS:test_run should fail for too small ctx 0 nsec
   test_raw_tp_test_run:PASS:test_run 0 nsec
   test_raw_tp_test_run:FAIL:check_retval unexpected check_retval: actual 0 != expected 26796
   test_raw_tp_test_run:PASS:test_run_opts 0 nsec
   test_raw_tp_test_run:PASS:check_on_cpu 0 nsec
   test_raw_tp_test_run:FAIL:check_retval unexpected check_retval: actual 0 != expected 26796
   test_raw_tp_test_run:PASS:test_run_opts 0 nsec
   test_raw_tp_test_run:PASS:check_on_cpu 0 nsec
   test_raw_tp_test_run:FAIL:check_retval unexpected check_retval: actual 0 != expected 26796
   test_raw_tp_test_run:PASS:test_run_opts should fail with ENXIO 0 nsec
   test_raw_tp_test_run:PASS:test_run_opts_fail 0 nsec
   test_raw_tp_test_run:PASS:test_run_opts should fail with EINVAL 0 nsec
   test_raw_tp_test_run:PASS:test_run_opts_fail 0 nsec
   [...]

Thanks,
Daniel

   [0] https://github.com/kernel-patches/bpf/actions/runs/3059535631/jobs/4939404438

Re: [PATCH bpf-next v2 0/3] A couple of small refactorings of BPF program call sites

[Kumar Kartikeya Dwivedi]

On Fri, 16 Sept 2022 at 22:58, Daniel Borkmann <daniel@iogearbox.net> wrote:
>
> On 9/5/22 9:33 PM, Toke Høiland-Jørgensen wrote:
> > Stanislav suggested[0] that these small refactorings could be split out from the
> > XDP queueing RFC series and merged separately. The first change is a small
> > repacking of struct softnet_data, the others change the BPF call sites to
> > support full 64-bit values as arguments to bpf_redirect_map() and as the return
> > value of a BPF program, relying on the fact that BPF registers are always 64-bit
> > wide to maintain backwards compatibility.
>
> Looks like might still be issues on s390 [0] around retval checking, e.g.:
>
>    [...]
>    #122     pe_preserve_elems:FAIL
>    test_raw_tp_test_run:PASS:parse_cpu_mask_file 0 nsec
>    test_raw_tp_test_run:PASS:skel_open 0 nsec
>    test_raw_tp_test_run:PASS:skel_attach 0 nsec
>    test_raw_tp_test_run:PASS:open /proc/self/comm 0 nsec
>    test_raw_tp_test_run:PASS:task rename 0 nsec
>    test_raw_tp_test_run:PASS:check_count 0 nsec
>    test_raw_tp_test_run:PASS:check_on_cpu 0 nsec
>    test_raw_tp_test_run:PASS:test_run should fail for too small ctx 0 nsec
>    test_raw_tp_test_run:PASS:test_run 0 nsec
>    test_raw_tp_test_run:FAIL:check_retval unexpected check_retval: actual 0 != expected 26796
>    test_raw_tp_test_run:PASS:test_run_opts 0 nsec
>    test_raw_tp_test_run:PASS:check_on_cpu 0 nsec
>    test_raw_tp_test_run:FAIL:check_retval unexpected check_retval: actual 0 != expected 26796
>    test_raw_tp_test_run:PASS:test_run_opts 0 nsec
>    test_raw_tp_test_run:PASS:check_on_cpu 0 nsec
>    test_raw_tp_test_run:FAIL:check_retval unexpected check_retval: actual 0 != expected 26796
>    test_raw_tp_test_run:PASS:test_run_opts should fail with ENXIO 0 nsec
>    test_raw_tp_test_run:PASS:test_run_opts_fail 0 nsec
>    test_raw_tp_test_run:PASS:test_run_opts should fail with EINVAL 0 nsec
>    test_raw_tp_test_run:PASS:test_run_opts_fail 0 nsec
>    [...]
>

Thanks, I'll take a look.

> Thanks,
> Daniel
>
>    [0] https://github.com/kernel-patches/bpf/actions/runs/3059535631/jobs/4939404438