Daniel Borkmann says:

====================
pull-request: bpf-next 2023-02-11

We've added 96 non-merge commits during the last 14 day(s) which contain
a total of 152 files changed, 4884 insertions(+), 962 deletions(-).

There is a minor conflict in drivers/net/ethernet/intel/ice/ice_main.c
between commit 5b246e533d01 ("ice: split probe into smaller functions")
from the net-next tree and commit 66c0e13ad236 ("drivers: net: turn on
XDP features") from the bpf-next tree. Remove the hunk given ice_cfg_netdev()
is otherwise there a 2nd time, and add XDP features to the existing
ice_cfg_netdev() one:

        [...]
        ice_set_netdev_features(netdev);
        netdev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
                               NETDEV_XDP_ACT_XSK_ZEROCOPY;
        ice_set_ops(netdev);
        [...]

Stephen's merge conflict mail:
https://lore.kernel.org/bpf/20230207101951.21a114fa@canb.auug.org.au/

The main changes are:

1) Add support for BPF trampoline on s390x which finally allows to remove many
   test cases from the BPF CI's DENYLIST.s390x, from Ilya Leoshkevich.

2) Add multi-buffer XDP support to ice driver, from Maciej Fijalkowski.

3) Add capability to export the XDP features supported by the NIC.
   Along with that, add a XDP compliance test tool,
   from Lorenzo Bianconi & Marek Majtyka.

4) Add __bpf_kfunc tag for marking kernel functions as kfuncs,
   from David Vernet.

5) Add a deep dive documentation about the verifier's register
   liveness tracking algorithm, from Eduard Zingerman.

6) Fix and follow-up cleanups for resolve_btfids to be compiled
   as a host program to avoid cross compile issues,
   from Jiri Olsa & Ian Rogers.

7) Batch of fixes to the BPF selftest for xdp_hw_metadata which resulted
   when testing on different NICs, from Jesper Dangaard Brouer.

8) Fix libbpf to better detect kernel version code on Debian, from Hao Xiang.

9) Extend libbpf to add an option for when the perf buffer should
   wake up, from Jon Doron.

10) Follow-up fix on xdp_metadata selftest to just consume on TX
    completion, from Stanislav Fomichev.

11) Extend the kfuncs.rst document with description on kfunc
    lifecycle & stability expectations, from David Vernet.

12) Fix bpftool prog profile to skip attaching to offline CPUs,
    from Tonghao Zhang.

====================

Link: https://lore.kernel.org/r/20230211002037.8489-1-daniel@iogearbox.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

14 files changed, 530 insertions, 85 deletions

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 5b3cb8068b4d..740bdb045b14 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -6453,6 +6453,18 @@ static int __get_type_size(struct btf *btf, u32 btf_id,
 	return -EINVAL;
 }
 
+static u8 __get_type_fmodel_flags(const struct btf_type *t)
+{
+	u8 flags = 0;
+
+	if (__btf_type_is_struct(t))
+		flags |= BTF_FMODEL_STRUCT_ARG;
+	if (btf_type_is_signed_int(t))
+		flags |= BTF_FMODEL_SIGNED_ARG;
+
+	return flags;
+}
+
 int btf_distill_func_proto(struct bpf_verifier_log *log,
 			   struct btf *btf,
 			   const struct btf_type *func,
@@ -6473,6 +6485,7 @@ int btf_distill_func_proto(struct bpf_verifier_log *log,
 			m->arg_flags[i] = 0;
 		}
 		m->ret_size = 8;
+		m->ret_flags = 0;
 		m->nr_args = MAX_BPF_FUNC_REG_ARGS;
 		return 0;
 	}
@@ -6492,6 +6505,7 @@ int btf_distill_func_proto(struct bpf_verifier_log *log,
 		return -EINVAL;
 	}
 	m->ret_size = ret;
+	m->ret_flags = __get_type_fmodel_flags(t);
 
 	for (i = 0; i < nargs; i++) {
 		if (i == nargs - 1 && args[i].type == 0) {
@@ -6516,7 +6530,7 @@ int btf_distill_func_proto(struct bpf_verifier_log *log,
 			return -EINVAL;
 		}
 		m->arg_size[i] = ret;
-		m->arg_flags[i] = __btf_type_is_struct(t) ? BTF_FMODEL_STRUCT_ARG : 0;
+		m->arg_flags[i] = __get_type_fmodel_flags(t);
 	}
 	m->nr_args = nargs;
 	return 0;
diff --git a/kernel/bpf/cpumask.c b/kernel/bpf/cpumask.c
index 25355a0a367a..52b981512a35 100644
--- a/kernel/bpf/cpumask.c
+++ b/kernel/bpf/cpumask.c
@@ -48,10 +48,13 @@ __diag_ignore_all("-Wmissing-prototypes",
  * bpf_cpumask_create() allocates memory using the BPF memory allocator, and
  * will not block. It may return NULL if no memory is available.
  */
-struct bpf_cpumask *bpf_cpumask_create(void)
+__bpf_kfunc struct bpf_cpumask *bpf_cpumask_create(void)
 {
 	struct bpf_cpumask *cpumask;
 
+	/* cpumask must be the first element so struct bpf_cpumask be cast to struct cpumask. */
+	BUILD_BUG_ON(offsetof(struct bpf_cpumask, cpumask) != 0);
+
 	cpumask = bpf_mem_alloc(&bpf_cpumask_ma, sizeof(*cpumask));
 	if (!cpumask)
 		return NULL;
@@ -71,7 +74,7 @@ struct bpf_cpumask *bpf_cpumask_create(void)
  * must either be embedded in a map as a kptr, or freed with
  * bpf_cpumask_release().
  */
-struct bpf_cpumask *bpf_cpumask_acquire(struct bpf_cpumask *cpumask)
+__bpf_kfunc struct bpf_cpumask *bpf_cpumask_acquire(struct bpf_cpumask *cpumask)
 {
 	refcount_inc(&cpumask->usage);
 	return cpumask;
@@ -87,7 +90,7 @@ struct bpf_cpumask *bpf_cpumask_acquire(struct bpf_cpumask *cpumask)
  * kptr, or freed with bpf_cpumask_release(). This function may return NULL if
  * no BPF cpumask was found in the specified map value.
  */
-struct bpf_cpumask *bpf_cpumask_kptr_get(struct bpf_cpumask **cpumaskp)
+__bpf_kfunc struct bpf_cpumask *bpf_cpumask_kptr_get(struct bpf_cpumask **cpumaskp)
 {
 	struct bpf_cpumask *cpumask;
 
@@ -113,7 +116,7 @@ struct bpf_cpumask *bpf_cpumask_kptr_get(struct bpf_cpumask **cpumaskp)
  * reference of the BPF cpumask has been released, it is subsequently freed in
  * an RCU callback in the BPF memory allocator.
  */
-void bpf_cpumask_release(struct bpf_cpumask *cpumask)
+__bpf_kfunc void bpf_cpumask_release(struct bpf_cpumask *cpumask)
 {
 	if (!cpumask)
 		return;
@@ -132,7 +135,7 @@ void bpf_cpumask_release(struct bpf_cpumask *cpumask)
  * Find the index of the first nonzero bit of the cpumask. A struct bpf_cpumask
  * pointer may be safely passed to this function.
  */
-u32 bpf_cpumask_first(const struct cpumask *cpumask)
+__bpf_kfunc u32 bpf_cpumask_first(const struct cpumask *cpumask)
 {
 	return cpumask_first(cpumask);
 }
@@ -145,7 +148,7 @@ u32 bpf_cpumask_first(const struct cpumask *cpumask)
  * Find the index of the first unset bit of the cpumask. A struct bpf_cpumask
  * pointer may be safely passed to this function.
  */
-u32 bpf_cpumask_first_zero(const struct cpumask *cpumask)
+__bpf_kfunc u32 bpf_cpumask_first_zero(const struct cpumask *cpumask)
 {
 	return cpumask_first_zero(cpumask);
 }
@@ -155,7 +158,7 @@ u32 bpf_cpumask_first_zero(const struct cpumask *cpumask)
  * @cpu: The CPU to be set in the cpumask.
  * @cpumask: The BPF cpumask in which a bit is being set.
  */
-void bpf_cpumask_set_cpu(u32 cpu, struct bpf_cpumask *cpumask)
+__bpf_kfunc void bpf_cpumask_set_cpu(u32 cpu, struct bpf_cpumask *cpumask)
 {
 	if (!cpu_valid(cpu))
 		return;
@@ -168,7 +171,7 @@ void bpf_cpumask_set_cpu(u32 cpu, struct bpf_cpumask *cpumask)
  * @cpu: The CPU to be cleared from the cpumask.
  * @cpumask: The BPF cpumask in which a bit is being cleared.
  */
-void bpf_cpumask_clear_cpu(u32 cpu, struct bpf_cpumask *cpumask)
+__bpf_kfunc void bpf_cpumask_clear_cpu(u32 cpu, struct bpf_cpumask *cpumask)
 {
 	if (!cpu_valid(cpu))
 		return;
@@ -185,7 +188,7 @@ void bpf_cpumask_clear_cpu(u32 cpu, struct bpf_cpumask *cpumask)
  * * true  - @cpu is set in the cpumask
  * * false - @cpu was not set in the cpumask, or @cpu is an invalid cpu.
  */
-bool bpf_cpumask_test_cpu(u32 cpu, const struct cpumask *cpumask)
+__bpf_kfunc bool bpf_cpumask_test_cpu(u32 cpu, const struct cpumask *cpumask)
 {
 	if (!cpu_valid(cpu))
 		return false;
@@ -202,7 +205,7 @@ bool bpf_cpumask_test_cpu(u32 cpu, const struct cpumask *cpumask)
  * * true  - @cpu is set in the cpumask
  * * false - @cpu was not set in the cpumask, or @cpu is invalid.
  */
-bool bpf_cpumask_test_and_set_cpu(u32 cpu, struct bpf_cpumask *cpumask)
+__bpf_kfunc bool bpf_cpumask_test_and_set_cpu(u32 cpu, struct bpf_cpumask *cpumask)
 {
 	if (!cpu_valid(cpu))
 		return false;
@@ -220,7 +223,7 @@ bool bpf_cpumask_test_and_set_cpu(u32 cpu, struct bpf_cpumask *cpumask)
  * * true  - @cpu is set in the cpumask
  * * false - @cpu was not set in the cpumask, or @cpu is invalid.
  */
-bool bpf_cpumask_test_and_clear_cpu(u32 cpu, struct bpf_cpumask *cpumask)
+__bpf_kfunc bool bpf_cpumask_test_and_clear_cpu(u32 cpu, struct bpf_cpumask *cpumask)
 {
 	if (!cpu_valid(cpu))
 		return false;
@@ -232,7 +235,7 @@ bool bpf_cpumask_test_and_clear_cpu(u32 cpu, struct bpf_cpumask *cpumask)
  * bpf_cpumask_setall() - Set all of the bits in a BPF cpumask.
  * @cpumask: The BPF cpumask having all of its bits set.
  */
-void bpf_cpumask_setall(struct bpf_cpumask *cpumask)
+__bpf_kfunc void bpf_cpumask_setall(struct bpf_cpumask *cpumask)
 {
 	cpumask_setall((struct cpumask *)cpumask);
 }
@@ -241,7 +244,7 @@ void bpf_cpumask_setall(struct bpf_cpumask *cpumask)
  * bpf_cpumask_clear() - Clear all of the bits in a BPF cpumask.
  * @cpumask: The BPF cpumask being cleared.
  */
-void bpf_cpumask_clear(struct bpf_cpumask *cpumask)
+__bpf_kfunc void bpf_cpumask_clear(struct bpf_cpumask *cpumask)
 {
 	cpumask_clear((struct cpumask *)cpumask);
 }
@@ -258,9 +261,9 @@ void bpf_cpumask_clear(struct bpf_cpumask *cpumask)
  *
  * struct bpf_cpumask pointers may be safely passed to @src1 and @src2.
  */
-bool bpf_cpumask_and(struct bpf_cpumask *dst,
-		     const struct cpumask *src1,
-		     const struct cpumask *src2)
+__bpf_kfunc bool bpf_cpumask_and(struct bpf_cpumask *dst,
+				 const struct cpumask *src1,
+				 const struct cpumask *src2)
 {
 	return cpumask_and((struct cpumask *)dst, src1, src2);
 }
@@ -273,9 +276,9 @@ bool bpf_cpumask_and(struct bpf_cpumask *dst,
  *
  * struct bpf_cpumask pointers may be safely passed to @src1 and @src2.
  */
-void bpf_cpumask_or(struct bpf_cpumask *dst,
-		    const struct cpumask *src1,
-		    const struct cpumask *src2)
+__bpf_kfunc void bpf_cpumask_or(struct bpf_cpumask *dst,
+				const struct cpumask *src1,
+				const struct cpumask *src2)
 {
 	cpumask_or((struct cpumask *)dst, src1, src2);
 }
@@ -288,9 +291,9 @@ void bpf_cpumask_or(struct bpf_cpumask *dst,
  *
  * struct bpf_cpumask pointers may be safely passed to @src1 and @src2.
  */
-void bpf_cpumask_xor(struct bpf_cpumask *dst,
-		     const struct cpumask *src1,
-		     const struct cpumask *src2)
+__bpf_kfunc void bpf_cpumask_xor(struct bpf_cpumask *dst,
+				 const struct cpumask *src1,
+				 const struct cpumask *src2)
 {
 	cpumask_xor((struct cpumask *)dst, src1, src2);
 }
@@ -306,7 +309,7 @@ void bpf_cpumask_xor(struct bpf_cpumask *dst,
  *
  * struct bpf_cpumask pointers may be safely passed to @src1 and @src2.
  */
-bool bpf_cpumask_equal(const struct cpumask *src1, const struct cpumask *src2)
+__bpf_kfunc bool bpf_cpumask_equal(const struct cpumask *src1, const struct cpumask *src2)
 {
 	return cpumask_equal(src1, src2);
 }
@@ -322,7 +325,7 @@ bool bpf_cpumask_equal(const struct cpumask *src1, const struct cpumask *src2)
  *
  * struct bpf_cpumask pointers may be safely passed to @src1 and @src2.
  */
-bool bpf_cpumask_intersects(const struct cpumask *src1, const struct cpumask *src2)
+__bpf_kfunc bool bpf_cpumask_intersects(const struct cpumask *src1, const struct cpumask *src2)
 {
 	return cpumask_intersects(src1, src2);
 }
@@ -338,7 +341,7 @@ bool bpf_cpumask_intersects(const struct cpumask *src1, const struct cpumask *sr
  *
  * struct bpf_cpumask pointers may be safely passed to @src1 and @src2.
  */
-bool bpf_cpumask_subset(const struct cpumask *src1, const struct cpumask *src2)
+__bpf_kfunc bool bpf_cpumask_subset(const struct cpumask *src1, const struct cpumask *src2)
 {
 	return cpumask_subset(src1, src2);
 }
@@ -353,7 +356,7 @@ bool bpf_cpumask_subset(const struct cpumask *src1, const struct cpumask *src2)
  *
  * A struct bpf_cpumask pointer may be safely passed to @cpumask.
  */
-bool bpf_cpumask_empty(const struct cpumask *cpumask)
+__bpf_kfunc bool bpf_cpumask_empty(const struct cpumask *cpumask)
 {
 	return cpumask_empty(cpumask);
 }
@@ -368,7 +371,7 @@ bool bpf_cpumask_empty(const struct cpumask *cpumask)
  *
  * A struct bpf_cpumask pointer may be safely passed to @cpumask.
  */
-bool bpf_cpumask_full(const struct cpumask *cpumask)
+__bpf_kfunc bool bpf_cpumask_full(const struct cpumask *cpumask)
 {
 	return cpumask_full(cpumask);
 }
@@ -380,7 +383,7 @@ bool bpf_cpumask_full(const struct cpumask *cpumask)
  *
  * A struct bpf_cpumask pointer may be safely passed to @src.
  */
-void bpf_cpumask_copy(struct bpf_cpumask *dst, const struct cpumask *src)
+__bpf_kfunc void bpf_cpumask_copy(struct bpf_cpumask *dst, const struct cpumask *src)
 {
 	cpumask_copy((struct cpumask *)dst, src);
 }
@@ -395,7 +398,7 @@ void bpf_cpumask_copy(struct bpf_cpumask *dst, const struct cpumask *src)
  *
  * A struct bpf_cpumask pointer may be safely passed to @src.
  */
-u32 bpf_cpumask_any(const struct cpumask *cpumask)
+__bpf_kfunc u32 bpf_cpumask_any(const struct cpumask *cpumask)
 {
 	return cpumask_any(cpumask);
 }
@@ -412,7 +415,7 @@ u32 bpf_cpumask_any(const struct cpumask *cpumask)
  *
  * struct bpf_cpumask pointers may be safely passed to @src1 and @src2.
  */
-u32 bpf_cpumask_any_and(const struct cpumask *src1, const struct cpumask *src2)
+__bpf_kfunc u32 bpf_cpumask_any_and(const struct cpumask *src1, const struct cpumask *src2)
 {
 	return cpumask_any_and(src1, src2);
 }
diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
index d01e4c55b376..2675fefc6cb6 100644
--- a/kernel/bpf/devmap.c
+++ b/kernel/bpf/devmap.c
@@ -474,7 +474,11 @@ static inline int __xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
 {
 	int err;
 
-	if (!dev->netdev_ops->ndo_xdp_xmit)
+	if (!(dev->xdp_features & NETDEV_XDP_ACT_NDO_XMIT))
+		return -EOPNOTSUPP;
+
+	if (unlikely(!(dev->xdp_features & NETDEV_XDP_ACT_NDO_XMIT_SG) &&
+		     xdp_frame_has_frags(xdpf)))
 		return -EOPNOTSUPP;
 
 	err = xdp_ok_fwd_dev(dev, xdp_get_frame_len(xdpf));
@@ -532,8 +536,14 @@ int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
 
 static bool is_valid_dst(struct bpf_dtab_netdev *obj, struct xdp_frame *xdpf)
 {
-	if (!obj ||
-	    !obj->dev->netdev_ops->ndo_xdp_xmit)
+	if (!obj)
+		return false;
+
+	if (!(obj->dev->xdp_features & NETDEV_XDP_ACT_NDO_XMIT))
+		return false;
+
+	if (unlikely(!(obj->dev->xdp_features & NETDEV_XDP_ACT_NDO_XMIT_SG) &&
+		     xdp_frame_has_frags(xdpf)))
 		return false;
 
 	if (xdp_ok_fwd_dev(obj->dev, xdp_get_frame_len(xdpf)))
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index 458db2db2f81..2dae44581922 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -1776,7 +1776,7 @@ __diag_push();
 __diag_ignore_all("-Wmissing-prototypes",
 		  "Global functions as their definitions will be in vmlinux BTF");
 
-void *bpf_obj_new_impl(u64 local_type_id__k, void *meta__ign)
+__bpf_kfunc void *bpf_obj_new_impl(u64 local_type_id__k, void *meta__ign)
 {
 	struct btf_struct_meta *meta = meta__ign;
 	u64 size = local_type_id__k;
@@ -1790,7 +1790,7 @@ void *bpf_obj_new_impl(u64 local_type_id__k, void *meta__ign)
 	return p;
 }
 
-void bpf_obj_drop_impl(void *p__alloc, void *meta__ign)
+__bpf_kfunc void bpf_obj_drop_impl(void *p__alloc, void *meta__ign)
 {
 	struct btf_struct_meta *meta = meta__ign;
 	void *p = p__alloc;
@@ -1811,12 +1811,12 @@ static void __bpf_list_add(struct bpf_list_node *node, struct bpf_list_head *hea
 	tail ? list_add_tail(n, h) : list_add(n, h);
 }
 
-void bpf_list_push_front(struct bpf_list_head *head, struct bpf_list_node *node)
+__bpf_kfunc void bpf_list_push_front(struct bpf_list_head *head, struct bpf_list_node *node)
 {
 	return __bpf_list_add(node, head, false);
 }
 
-void bpf_list_push_back(struct bpf_list_head *head, struct bpf_list_node *node)
+__bpf_kfunc void bpf_list_push_back(struct bpf_list_head *head, struct bpf_list_node *node)
 {
 	return __bpf_list_add(node, head, true);
 }
@@ -1834,12 +1834,12 @@ static struct bpf_list_node *__bpf_list_del(struct bpf_list_head *head, bool tai
 	return (struct bpf_list_node *)n;
 }
 
-struct bpf_list_node *bpf_list_pop_front(struct bpf_list_head *head)
+__bpf_kfunc struct bpf_list_node *bpf_list_pop_front(struct bpf_list_head *head)
 {
 	return __bpf_list_del(head, false);
 }
 
-struct bpf_list_node *bpf_list_pop_back(struct bpf_list_head *head)
+__bpf_kfunc struct bpf_list_node *bpf_list_pop_back(struct bpf_list_head *head)
 {
 	return __bpf_list_del(head, true);
 }
@@ -1850,7 +1850,7 @@ struct bpf_list_node *bpf_list_pop_back(struct bpf_list_head *head)
  * bpf_task_release().
  * @p: The task on which a reference is being acquired.
  */
-struct task_struct *bpf_task_acquire(struct task_struct *p)
+__bpf_kfunc struct task_struct *bpf_task_acquire(struct task_struct *p)
 {
 	return get_task_struct(p);
 }
@@ -1861,7 +1861,7 @@ struct task_struct *bpf_task_acquire(struct task_struct *p)
  * released by calling bpf_task_release().
  * @p: The task on which a reference is being acquired.
  */
-struct task_struct *bpf_task_acquire_not_zero(struct task_struct *p)
+__bpf_kfunc struct task_struct *bpf_task_acquire_not_zero(struct task_struct *p)
 {
 	/* For the time being this function returns NULL, as it's not currently
 	 * possible to safely acquire a reference to a task with RCU protection
@@ -1913,7 +1913,7 @@ struct task_struct *bpf_task_acquire_not_zero(struct task_struct *p)
  * be released by calling bpf_task_release().
  * @pp: A pointer to a task kptr on which a reference is being acquired.
  */
-struct task_struct *bpf_task_kptr_get(struct task_struct **pp)
+__bpf_kfunc struct task_struct *bpf_task_kptr_get(struct task_struct **pp)
 {
 	/* We must return NULL here until we have clarity on how to properly
 	 * leverage RCU for ensuring a task's lifetime. See the comment above
@@ -1926,7 +1926,7 @@ struct task_struct *bpf_task_kptr_get(struct task_struct **pp)
  * bpf_task_release - Release the reference acquired on a task.
  * @p: The task on which a reference is being released.
  */
-void bpf_task_release(struct task_struct *p)
+__bpf_kfunc void bpf_task_release(struct task_struct *p)
 {
 	if (!p)
 		return;
@@ -1941,7 +1941,7 @@ void bpf_task_release(struct task_struct *p)
  * calling bpf_cgroup_release().
  * @cgrp: The cgroup on which a reference is being acquired.
  */
-struct cgroup *bpf_cgroup_acquire(struct cgroup *cgrp)
+__bpf_kfunc struct cgroup *bpf_cgroup_acquire(struct cgroup *cgrp)
 {
 	cgroup_get(cgrp);
 	return cgrp;
@@ -1953,7 +1953,7 @@ struct cgroup *bpf_cgroup_acquire(struct cgroup *cgrp)
  * be released by calling bpf_cgroup_release().
  * @cgrpp: A pointer to a cgroup kptr on which a reference is being acquired.
  */
-struct cgroup *bpf_cgroup_kptr_get(struct cgroup **cgrpp)
+__bpf_kfunc struct cgroup *bpf_cgroup_kptr_get(struct cgroup **cgrpp)
 {
 	struct cgroup *cgrp;
 
@@ -1985,7 +1985,7 @@ struct cgroup *bpf_cgroup_kptr_get(struct cgroup **cgrpp)
  * drops to 0.
  * @cgrp: The cgroup on which a reference is being released.
  */
-void bpf_cgroup_release(struct cgroup *cgrp)
+__bpf_kfunc void bpf_cgroup_release(struct cgroup *cgrp)
 {
 	if (!cgrp)
 		return;
@@ -2000,7 +2000,7 @@ void bpf_cgroup_release(struct cgroup *cgrp)
  * @cgrp: The cgroup for which we're performing a lookup.
  * @level: The level of ancestor to look up.
  */
-struct cgroup *bpf_cgroup_ancestor(struct cgroup *cgrp, int level)
+__bpf_kfunc struct cgroup *bpf_cgroup_ancestor(struct cgroup *cgrp, int level)
 {
 	struct cgroup *ancestor;
 
@@ -2019,7 +2019,7 @@ struct cgroup *bpf_cgroup_ancestor(struct cgroup *cgrp, int level)
  * stored in a map, or released with bpf_task_release().
  * @pid: The pid of the task being looked up.
  */
-struct task_struct *bpf_task_from_pid(s32 pid)
+__bpf_kfunc struct task_struct *bpf_task_from_pid(s32 pid)
 {
 	struct task_struct *p;
 
@@ -2032,22 +2032,22 @@ struct task_struct *bpf_task_from_pid(s32 pid)
 	return p;
 }
 
-void *bpf_cast_to_kern_ctx(void *obj)
+__bpf_kfunc void *bpf_cast_to_kern_ctx(void *obj)
 {
 	return obj;
 }
 
-void *bpf_rdonly_cast(void *obj__ign, u32 btf_id__k)
+__bpf_kfunc void *bpf_rdonly_cast(void *obj__ign, u32 btf_id__k)
 {
 	return obj__ign;
 }
 
-void bpf_rcu_read_lock(void)
+__bpf_kfunc void bpf_rcu_read_lock(void)
 {
 	rcu_read_lock();
 }
 
-void bpf_rcu_read_unlock(void)
+__bpf_kfunc void bpf_rcu_read_unlock(void)
 {
 	rcu_read_unlock();
 }
diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
index 88aae38fde66..0c85e06f7ea7 100644
--- a/kernel/bpf/offload.c
+++ b/kernel/bpf/offload.c
@@ -136,7 +136,7 @@ static void __bpf_map_offload_destroy(struct bpf_offloaded_map *offmap)
 {
 	WARN_ON(bpf_map_offload_ndo(offmap, BPF_OFFLOAD_MAP_FREE));
 	/* Make sure BPF_MAP_GET_NEXT_ID can't find this dead map */
-	bpf_map_free_id(&offmap->map, true);
+	bpf_map_free_id(&offmap->map);
 	list_del_init(&offmap->offloads);
 	offmap->netdev = NULL;
 }
diff --git a/kernel/bpf/preload/bpf_preload_kern.c b/kernel/bpf/preload/bpf_preload_kern.c
index 5106b5372f0c..b56f9f3314fd 100644
--- a/kernel/bpf/preload/bpf_preload_kern.c
+++ b/kernel/bpf/preload/bpf_preload_kern.c
@@ -3,7 +3,11 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include "bpf_preload.h"
-#include "iterators/iterators.lskel.h"
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#include "iterators/iterators.lskel-little-endian.h"
+#else
+#include "iterators/iterators.lskel-big-endian.h"
+#endif
 
 static struct bpf_link *maps_link, *progs_link;
 static struct iterators_bpf *skel;
diff --git a/kernel/bpf/preload/iterators/Makefile b/kernel/bpf/preload/iterators/Makefile
index 6762b1260f2f..8937dc6bc8d0 100644
--- a/kernel/bpf/preload/iterators/Makefile
+++ b/kernel/bpf/preload/iterators/Makefile
@@ -35,20 +35,22 @@ endif
 
 .PHONY: all clean
 
-all: iterators.lskel.h
+all: iterators.lskel-little-endian.h
+
+big: iterators.lskel-big-endian.h
 
 clean:
 	$(call msg,CLEAN)
 	$(Q)rm -rf $(OUTPUT) iterators
 
-iterators.lskel.h: $(OUTPUT)/iterators.bpf.o | $(BPFTOOL)
+iterators.lskel-%.h: $(OUTPUT)/%/iterators.bpf.o | $(BPFTOOL)
 	$(call msg,GEN-SKEL,$@)
 	$(Q)$(BPFTOOL) gen skeleton -L $< > $@
 
-
-$(OUTPUT)/iterators.bpf.o: iterators.bpf.c $(BPFOBJ) | $(OUTPUT)
+$(OUTPUT)/%/iterators.bpf.o: iterators.bpf.c $(BPFOBJ) | $(OUTPUT)
 	$(call msg,BPF,$@)
-	$(Q)$(CLANG) -g -O2 -target bpf $(INCLUDES)			      \
+	$(Q)mkdir -p $(@D)
+	$(Q)$(CLANG) -g -O2 -target bpf -m$* $(INCLUDES)		      \
 		 -c $(filter %.c,$^) -o $@ &&				      \
 	$(LLVM_STRIP) -g $@
 
diff --git a/kernel/bpf/preload/iterators/README b/kernel/bpf/preload/iterators/README
index 7fd6d39a9ad2..98e7c90ea012 100644
--- a/kernel/bpf/preload/iterators/README
+++ b/kernel/bpf/preload/iterators/README
@@ -1,4 +1,7 @@
 WARNING:
-If you change "iterators.bpf.c" do "make -j" in this directory to rebuild "iterators.skel.h".
+If you change "iterators.bpf.c" do "make -j" in this directory to
+rebuild "iterators.lskel-little-endian.h". Then, on a big-endian
+machine, do "make -j big" in this directory to rebuild
+"iterators.lskel-big-endian.h". Commit both resulting headers.
 Make sure to have clang 10 installed.
 See Documentation/bpf/bpf_devel_QA.rst
diff --git a/kernel/bpf/preload/iterators/iterators.lskel-big-endian.h b/kernel/bpf/preload/iterators/iterators.lskel-big-endian.h
new file mode 100644
index 000000000000..ebdc6c0cdb70
--- /dev/null
+++ b/kernel/bpf/preload/iterators/iterators.lskel-big-endian.h
@@ -0,0 +1,419 @@
+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+/* THIS FILE IS AUTOGENERATED BY BPFTOOL! */
+#ifndef __ITERATORS_BPF_SKEL_H__
+#define __ITERATORS_BPF_SKEL_H__
+
+#include <bpf/skel_internal.h>
+
+struct iterators_bpf {
+	struct bpf_loader_ctx ctx;
+	struct {
+		struct bpf_map_desc rodata;
+	} maps;
+	struct {
+		struct bpf_prog_desc dump_bpf_map;
+		struct bpf_prog_desc dump_bpf_prog;
+	} progs;
+	struct {
+		int dump_bpf_map_fd;
+		int dump_bpf_prog_fd;
+	} links;
+};
+
+static inline int
+iterators_bpf__dump_bpf_map__attach(struct iterators_bpf *skel)
+{
+	int prog_fd = skel->progs.dump_bpf_map.prog_fd;
+	int fd = skel_link_create(prog_fd, 0, BPF_TRACE_ITER);
+
+	if (fd > 0)
+		skel->links.dump_bpf_map_fd = fd;
+	return fd;
+}
+
+static inline int
+iterators_bpf__dump_bpf_prog__attach(struct iterators_bpf *skel)
+{
+	int prog_fd = skel->progs.dump_bpf_prog.prog_fd;
+	int fd = skel_link_create(prog_fd, 0, BPF_TRACE_ITER);
+
+	if (fd > 0)
+		skel->links.dump_bpf_prog_fd = fd;
+	return fd;
+}
+
+static inline int
+iterators_bpf__attach(struct iterators_bpf *skel)
+{
+	int ret = 0;
+
+	ret = ret < 0 ? ret : iterators_bpf__dump_bpf_map__attach(skel);
+	ret = ret < 0 ? ret : iterators_bpf__dump_bpf_prog__attach(skel);
+	return ret < 0 ? ret : 0;
+}
+
+static inline void
+iterators_bpf__detach(struct iterators_bpf *skel)
+{
+	skel_closenz(skel->links.dump_bpf_map_fd);
+	skel_closenz(skel->links.dump_bpf_prog_fd);
+}
+static void
+iterators_bpf__destroy(struct iterators_bpf *skel)
+{
+	if (!skel)
+		return;
+	iterators_bpf__detach(skel);
+	skel_closenz(skel->progs.dump_bpf_map.prog_fd);
+	skel_closenz(skel->progs.dump_bpf_prog.prog_fd);
+	skel_closenz(skel->maps.rodata.map_fd);
+	skel_free(skel);
+}
+static inline struct iterators_bpf *
+iterators_bpf__open(void)
+{
+	struct iterators_bpf *skel;
+
+	skel = skel_alloc(sizeof(*skel));
+	if (!skel)
+		goto cleanup;
+	skel->ctx.sz = (void *)&skel->links - (void *)skel;
+	return skel;
+cleanup:
+	iterators_bpf__destroy(skel);
+	return NULL;
+}
+
+static inline int
+iterators_bpf__load(struct iterators_bpf *skel)
+{
+	struct bpf_load_and_run_opts opts = {};
+	int err;
+
+	opts.ctx = (struct bpf_loader_ctx *)skel;
+	opts.data_sz = 6008;
+	opts.data = (void *)"\
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+\x3a\x04\0\0\x03\0\0\0\x18\0\0\x03\xa5\0\0\0\x1b\0\0\0\0\0\0\x03\xad\0\0\0\x21\
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+\0\0\0\0\0\x04\x2b\x04\0\0\x01\0\0\0\x04\0\0\x04\x34\0\0\0\x0e\0\0\0\0\0\0\0\0\
+\x03\0\0\0\0\0\0\0\0\0\0\x1c\0\0\0\x12\0\0\0\x23\0\0\x04\xaa\x0e\0\0\0\0\0\0\
+\x25\0\0\0\0\0\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\x1c\0\0\0\x12\0\0\0\x0e\0\0\x04\
+\xbe\x0e\0\0\0\0\0\0\x27\0\0\0\0\0\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\x1c\0\0\0\x12\
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+\x3e\0\0\0\0\0\0\0\x1a\0\0\0\x41\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
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+\x6f\x67\0\0\0\0\0\0\0\0\0\0\x1c\0\0\0\0\0\0\0\x08\0\0\0\0\0\0\0\0\0\0\0\x01\0\
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+\x66\x5f\x70\x72\x6f\x67\0\0\0\0\0\0\0";
+	opts.insns_sz = 2216;
+	opts.insns = (void *)"\
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+\x10\0\0\0\0\0\0\xd5\x10\0\x02\0\0\0\0\xbf\x91\0\0\0\0\0\0\x85\0\0\0\0\0\0\xa8\
+\xc5\x70\xff\x01\0\0\0\0\x63\xa7\xff\x84\0\0\0\0\x61\x1a\xff\x78\0\0\0\0\xd5\
+\x10\0\x02\0\0\0\0\xbf\x91\0\0\0\0\0\0\x85\0\0\0\0\0\0\xa8\x61\x0a\xff\x80\0\0\
+\0\0\x63\x60\0\x28\0\0\0\0\x61\x0a\xff\x84\0\0\0\0\x63\x60\0\x2c\0\0\0\0\x18\
+\x16\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x61\x01\0\0\0\0\0\0\x63\x60\0\x18\0\0\0\0\xb7\
+\0\0\0\0\0\0\0\x95\0\0\0\0\0\0\0";
+	err = bpf_load_and_run(&opts);
+	if (err < 0)
+		return err;
+	return 0;
+}
+
+static inline struct iterators_bpf *
+iterators_bpf__open_and_load(void)
+{
+	struct iterators_bpf *skel;
+
+	skel = iterators_bpf__open();
+	if (!skel)
+		return NULL;
+	if (iterators_bpf__load(skel)) {
+		iterators_bpf__destroy(skel);
+		return NULL;
+	}
+	return skel;
+}
+
+__attribute__((unused)) static void
+iterators_bpf__assert(struct iterators_bpf *s __attribute__((unused)))
+{
+#ifdef __cplusplus
+#define _Static_assert static_assert
+#endif
+#ifdef __cplusplus
+#undef _Static_assert
+#endif
+}
+
+#endif /* __ITERATORS_BPF_SKEL_H__ */
diff --git a/kernel/bpf/preload/iterators/iterators.lskel.h b/kernel/bpf/preload/iterators/iterators.lskel-little-endian.h
index 70f236a82fe1..70f236a82fe1 100644
--- a/kernel/bpf/preload/iterators/iterators.lskel.h
+++ b/kernel/bpf/preload/iterators/iterators.lskel-little-endian.h
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 99417b387547..bcc97613de76 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -390,7 +390,7 @@ static int bpf_map_alloc_id(struct bpf_map *map)
 	return id > 0 ? 0 : id;
 }
 
-void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock)
+void bpf_map_free_id(struct bpf_map *map)
 {
 	unsigned long flags;
 
@@ -402,18 +402,12 @@ void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock)
 	if (!map->id)
 		return;
 
-	if (do_idr_lock)
-		spin_lock_irqsave(&map_idr_lock, flags);
-	else
-		__acquire(&map_idr_lock);
+	spin_lock_irqsave(&map_idr_lock, flags);
 
 	idr_remove(&map_idr, map->id);
 	map->id = 0;
 
-	if (do_idr_lock)
-		spin_unlock_irqrestore(&map_idr_lock, flags);
-	else
-		__release(&map_idr_lock);
+	spin_unlock_irqrestore(&map_idr_lock, flags);
 }
 
 #ifdef CONFIG_MEMCG_KMEM
@@ -706,13 +700,13 @@ static void bpf_map_put_uref(struct bpf_map *map)
 }
 
 /* decrement map refcnt and schedule it for freeing via workqueue
- * (unrelying map implementation ops->map_free() might sleep)
+ * (underlying map implementation ops->map_free() might sleep)
  */
-static void __bpf_map_put(struct bpf_map *map, bool do_idr_lock)
+void bpf_map_put(struct bpf_map *map)
 {
 	if (atomic64_dec_and_test(&map->refcnt)) {
 		/* bpf_map_free_id() must be called first */
-		bpf_map_free_id(map, do_idr_lock);
+		bpf_map_free_id(map);
 		btf_put(map->btf);
 		INIT_WORK(&map->work, bpf_map_free_deferred);
 		/* Avoid spawning kworkers, since they all might contend
@@ -721,11 +715,6 @@ static void __bpf_map_put(struct bpf_map *map, bool do_idr_lock)
 		queue_work(system_unbound_wq, &map->work);
 	}
 }
-
-void bpf_map_put(struct bpf_map *map)
-{
-	__bpf_map_put(map, true);
-}
 EXPORT_SYMBOL_GPL(bpf_map_put);
 
 void bpf_map_put_with_uref(struct bpf_map *map)
diff --git a/kernel/cgroup/rstat.c b/kernel/cgroup/rstat.c
index 793ecff29038..831f1f472bb8 100644
--- a/kernel/cgroup/rstat.c
+++ b/kernel/cgroup/rstat.c
@@ -26,7 +26,7 @@ static struct cgroup_rstat_cpu *cgroup_rstat_cpu(struct cgroup *cgrp, int cpu)
  * rstat_cpu->updated_children list.  See the comment on top of
  * cgroup_rstat_cpu definition for details.
  */
-void cgroup_rstat_updated(struct cgroup *cgrp, int cpu)
+__bpf_kfunc void cgroup_rstat_updated(struct cgroup *cgrp, int cpu)
 {
 	raw_spinlock_t *cpu_lock = per_cpu_ptr(&cgroup_rstat_cpu_lock, cpu);
 	unsigned long flags;
@@ -231,7 +231,7 @@ static void cgroup_rstat_flush_locked(struct cgroup *cgrp, bool may_sleep)
  *
  * This function may block.
  */
-void cgroup_rstat_flush(struct cgroup *cgrp)
+__bpf_kfunc void cgroup_rstat_flush(struct cgroup *cgrp)
 {
 	might_sleep();
 
diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index 969e8f52f7da..b1cf259854ca 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -6,6 +6,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/btf.h>
 #include <linux/capability.h>
 #include <linux/mm.h>
 #include <linux/file.h>
@@ -975,7 +976,7 @@ void __noclone __crash_kexec(struct pt_regs *regs)
 }
 STACK_FRAME_NON_STANDARD(__crash_kexec);
 
-void crash_kexec(struct pt_regs *regs)
+__bpf_kfunc void crash_kexec(struct pt_regs *regs)
 {
 	int old_cpu, this_cpu;
 
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index d1313435af2b..c58baf9983cc 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -1237,7 +1237,7 @@ __diag_ignore_all("-Wmissing-prototypes",
  * Return: a bpf_key pointer with a valid key pointer if the key is found, a
  *         NULL pointer otherwise.
  */
-struct bpf_key *bpf_lookup_user_key(u32 serial, u64 flags)
+__bpf_kfunc struct bpf_key *bpf_lookup_user_key(u32 serial, u64 flags)
 {
 	key_ref_t key_ref;
 	struct bpf_key *bkey;
@@ -1286,7 +1286,7 @@ struct bpf_key *bpf_lookup_user_key(u32 serial, u64 flags)
  * Return: a bpf_key pointer with an invalid key pointer set from the
  *         pre-determined ID on success, a NULL pointer otherwise
  */
-struct bpf_key *bpf_lookup_system_key(u64 id)
+__bpf_kfunc struct bpf_key *bpf_lookup_system_key(u64 id)
 {
 	struct bpf_key *bkey;
 
@@ -1310,7 +1310,7 @@ struct bpf_key *bpf_lookup_system_key(u64 id)
  * Decrement the reference count of the key inside *bkey*, if the pointer
  * is valid, and free *bkey*.
  */
-void bpf_key_put(struct bpf_key *bkey)
+__bpf_kfunc void bpf_key_put(struct bpf_key *bkey)
 {
 	if (bkey->has_ref)
 		key_put(bkey->key);
@@ -1330,7 +1330,7 @@ void bpf_key_put(struct bpf_key *bkey)
  *
  * Return: 0 on success, a negative value on error.
  */
-int bpf_verify_pkcs7_signature(struct bpf_dynptr_kern *data_ptr,
+__bpf_kfunc int bpf_verify_pkcs7_signature(struct bpf_dynptr_kern *data_ptr,
 			       struct bpf_dynptr_kern *sig_ptr,
 			       struct bpf_key *trusted_keyring)
 {