Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Alexei Starovoitov says:

====================
pull-request: bpf-next 2019-02-01

The following pull-request contains BPF updates for your *net-next* tree.

The main changes are:

1) introduce bpf_spin_lock, from Alexei.

2) convert xdp samples to libbpf, from Maciej.

3) skip verifier tests for unsupported program/map types, from Stanislav.

4) powerpc64 JIT support for BTF line info, from Sandipan.

5) assorted fixed, from Valdis, Jesper, Jiong.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/powerpc/net/bpf_jit_comp64.c

@@ -1185,6 +1185,7 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
 
 	bpf_flush_icache(bpf_hdr, (u8 *)bpf_hdr + (bpf_hdr->pages * PAGE_SIZE));
 	if (!fp->is_func || extra_pass) {
+		bpf_prog_fill_jited_linfo(fp, addrs);
 out_addrs:
 		kfree(addrs);
 		kfree(jit_data);

drivers/net/ethernet/netronome/nfp/bpf/jit.c

@@ -1967,6 +1967,9 @@ static int neg_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
  */
 static int __shl_imm64(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt)
 {
+	if (!shift_amt)
+		return 0;
+
 	if (shift_amt < 32) {
 		emit_shf(nfp_prog, reg_both(dst + 1), reg_a(dst + 1),
 			 SHF_OP_NONE, reg_b(dst), SHF_SC_R_DSHF,
@@ -2079,6 +2082,9 @@ static int shl_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
  */
 static int __shr_imm64(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt)
 {
+	if (!shift_amt)
+		return 0;
+
 	if (shift_amt < 32) {
 		emit_shf(nfp_prog, reg_both(dst), reg_a(dst + 1), SHF_OP_NONE,
 			 reg_b(dst), SHF_SC_R_DSHF, shift_amt);
@@ -2180,6 +2186,9 @@ static int shr_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
  */
 static int __ashr_imm64(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt)
 {
+	if (!shift_amt)
+		return 0;
+
 	if (shift_amt < 32) {
 		emit_shf(nfp_prog, reg_both(dst), reg_a(dst + 1), SHF_OP_NONE,
 			 reg_b(dst), SHF_SC_R_DSHF, shift_amt);
@@ -2388,10 +2397,13 @@ static int neg_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
 
 static int __ashr_imm(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt)
 {
-	/* Set signedness bit (MSB of result). */
-	emit_alu(nfp_prog, reg_none(), reg_a(dst), ALU_OP_OR, reg_imm(0));
-	emit_shf(nfp_prog, reg_both(dst), reg_none(), SHF_OP_ASHR, reg_b(dst),
-		 SHF_SC_R_SHF, shift_amt);
+	if (shift_amt) {
+		/* Set signedness bit (MSB of result). */
+		emit_alu(nfp_prog, reg_none(), reg_a(dst), ALU_OP_OR,
+			 reg_imm(0));
+		emit_shf(nfp_prog, reg_both(dst), reg_none(), SHF_OP_ASHR,
+			 reg_b(dst), SHF_SC_R_SHF, shift_amt);
+	}
 	wrp_immed(nfp_prog, reg_both(dst + 1), 0);
 
 	return 0;
@@ -2429,18 +2441,75 @@ static int ashr_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
 	return __ashr_imm(nfp_prog, dst, insn->imm);
 }
 
+static int __shr_imm(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt)
+{
+	if (shift_amt)
+		emit_shf(nfp_prog, reg_both(dst), reg_none(), SHF_OP_NONE,
+			 reg_b(dst), SHF_SC_R_SHF, shift_amt);
+	wrp_immed(nfp_prog, reg_both(dst + 1), 0);
+	return 0;
+}
+
+static int shr_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+	const struct bpf_insn *insn = &meta->insn;
+	u8 dst = insn->dst_reg * 2;
+
+	return __shr_imm(nfp_prog, dst, insn->imm);
+}
+
+static int shr_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+	const struct bpf_insn *insn = &meta->insn;
+	u64 umin, umax;
+	u8 dst, src;
+
+	dst = insn->dst_reg * 2;
+	umin = meta->umin_src;
+	umax = meta->umax_src;
+	if (umin == umax)
+		return __shr_imm(nfp_prog, dst, umin);
+
+	src = insn->src_reg * 2;
+	emit_alu(nfp_prog, reg_none(), reg_a(src), ALU_OP_OR, reg_imm(0));
+	emit_shf_indir(nfp_prog, reg_both(dst), reg_none(), SHF_OP_NONE,
+		       reg_b(dst), SHF_SC_R_SHF);
+	wrp_immed(nfp_prog, reg_both(dst + 1), 0);
+	return 0;
+}
+
+static int __shl_imm(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt)
+{
+	if (shift_amt)
+		emit_shf(nfp_prog, reg_both(dst), reg_none(), SHF_OP_NONE,
+			 reg_b(dst), SHF_SC_L_SHF, shift_amt);
+	wrp_immed(nfp_prog, reg_both(dst + 1), 0);
+	return 0;
+}
+
 static int shl_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
 {
 	const struct bpf_insn *insn = &meta->insn;
+	u8 dst = insn->dst_reg * 2;
 
-	if (!insn->imm)
-		return 1; /* TODO: zero shift means indirect */
+	return __shl_imm(nfp_prog, dst, insn->imm);
+}
 
-	emit_shf(nfp_prog, reg_both(insn->dst_reg * 2),
-		 reg_none(), SHF_OP_NONE, reg_b(insn->dst_reg * 2),
-		 SHF_SC_L_SHF, insn->imm);
-	wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0);
+static int shl_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+	const struct bpf_insn *insn = &meta->insn;
+	u64 umin, umax;
+	u8 dst, src;
 
+	dst = insn->dst_reg * 2;
+	umin = meta->umin_src;
+	umax = meta->umax_src;
+	if (umin == umax)
+		return __shl_imm(nfp_prog, dst, umin);
+
+	src = insn->src_reg * 2;
+	shl_reg64_lt32_low(nfp_prog, dst, src);
+	wrp_immed(nfp_prog, reg_both(dst + 1), 0);
 	return 0;
 }
 
@@ -3350,7 +3419,10 @@ static const instr_cb_t instr_cb[256] = {
 	[BPF_ALU | BPF_DIV | BPF_X] =	div_reg,
 	[BPF_ALU | BPF_DIV | BPF_K] =	div_imm,
 	[BPF_ALU | BPF_NEG] =		neg_reg,
+	[BPF_ALU | BPF_LSH | BPF_X] =	shl_reg,
 	[BPF_ALU | BPF_LSH | BPF_K] =	shl_imm,
+	[BPF_ALU | BPF_RSH | BPF_X] =	shr_reg,
+	[BPF_ALU | BPF_RSH | BPF_K] =	shr_imm,
 	[BPF_ALU | BPF_ARSH | BPF_X] =	ashr_reg,
 	[BPF_ALU | BPF_ARSH | BPF_K] =	ashr_imm,
 	[BPF_ALU | BPF_END | BPF_X] =	end_reg32,

include/linux/bpf-cgroup.h

@@ -78,7 +78,7 @@ int cgroup_bpf_inherit(struct cgroup *cgrp);
 int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
 			enum bpf_attach_type type, u32 flags);
 int __cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
-			enum bpf_attach_type type, u32 flags);
+			enum bpf_attach_type type);
 int __cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr,
 		       union bpf_attr __user *uattr);
 

include/linux/bpf.h

@@ -72,14 +72,15 @@ struct bpf_map {
 	u32 value_size;
 	u32 max_entries;
 	u32 map_flags;
-	u32 pages;
+	int spin_lock_off; /* >=0 valid offset, <0 error */
 	u32 id;
 	int numa_node;
 	u32 btf_key_type_id;
 	u32 btf_value_type_id;
 	struct btf *btf;
+	u32 pages;
 	bool unpriv_array;
-	/* 55 bytes hole */
+	/* 51 bytes hole */
 
 	/* The 3rd and 4th cacheline with misc members to avoid false sharing
 	 * particularly with refcounting.
@@ -91,6 +92,36 @@ struct bpf_map {
 	char name[BPF_OBJ_NAME_LEN];
 };
 
+static inline bool map_value_has_spin_lock(const struct bpf_map *map)
+{
+	return map->spin_lock_off >= 0;
+}
+
+static inline void check_and_init_map_lock(struct bpf_map *map, void *dst)
+{
+	if (likely(!map_value_has_spin_lock(map)))
+		return;
+	*(struct bpf_spin_lock *)(dst + map->spin_lock_off) =
+		(struct bpf_spin_lock){};
+}
+
+/* copy everything but bpf_spin_lock */
+static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
+{
+	if (unlikely(map_value_has_spin_lock(map))) {
+		u32 off = map->spin_lock_off;
+
+		memcpy(dst, src, off);
+		memcpy(dst + off + sizeof(struct bpf_spin_lock),
+		       src + off + sizeof(struct bpf_spin_lock),
+		       map->value_size - off - sizeof(struct bpf_spin_lock));
+	} else {
+		memcpy(dst, src, map->value_size);
+	}
+}
+void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
+			   bool lock_src);
+
 struct bpf_offload_dev;
 struct bpf_offloaded_map;
 
@@ -162,6 +193,7 @@ enum bpf_arg_type {
 	ARG_PTR_TO_CTX,		/* pointer to context */
 	ARG_ANYTHING,		/* any (initialized) argument is ok */
 	ARG_PTR_TO_SOCKET,	/* pointer to bpf_sock */
+	ARG_PTR_TO_SPIN_LOCK,	/* pointer to bpf_spin_lock */
 };
 
 /* type of values returned from helper functions */
@@ -879,7 +911,8 @@ extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
-
+extern const struct bpf_func_proto bpf_spin_lock_proto;
+extern const struct bpf_func_proto bpf_spin_unlock_proto;
 extern const struct bpf_func_proto bpf_get_local_storage_proto;
 
 /* Shared helpers among cBPF and eBPF. */

include/linux/bpf_types.h

@@ -6,9 +6,11 @@ BPF_PROG_TYPE(BPF_PROG_TYPE_SOCKET_FILTER, sk_filter)
 BPF_PROG_TYPE(BPF_PROG_TYPE_SCHED_CLS, tc_cls_act)
 BPF_PROG_TYPE(BPF_PROG_TYPE_SCHED_ACT, tc_cls_act)
 BPF_PROG_TYPE(BPF_PROG_TYPE_XDP, xdp)
+#ifdef CONFIG_CGROUP_BPF
 BPF_PROG_TYPE(BPF_PROG_TYPE_CGROUP_SKB, cg_skb)
 BPF_PROG_TYPE(BPF_PROG_TYPE_CGROUP_SOCK, cg_sock)
 BPF_PROG_TYPE(BPF_PROG_TYPE_CGROUP_SOCK_ADDR, cg_sock_addr)
+#endif
 BPF_PROG_TYPE(BPF_PROG_TYPE_LWT_IN, lwt_in)
 BPF_PROG_TYPE(BPF_PROG_TYPE_LWT_OUT, lwt_out)
 BPF_PROG_TYPE(BPF_PROG_TYPE_LWT_XMIT, lwt_xmit)

include/linux/bpf_verifier.h

@@ -148,6 +148,7 @@ struct bpf_verifier_state {
 	/* call stack tracking */
 	struct bpf_func_state *frame[MAX_CALL_FRAMES];
 	u32 curframe;
+	u32 active_spin_lock;
 	bool speculative;
 };
 

include/linux/btf.h

@@ -50,6 +50,7 @@ u32 btf_id(const struct btf *btf);
 bool btf_member_is_reg_int(const struct btf *btf, const struct btf_type *s,
 			   const struct btf_member *m,
 			   u32 expected_offset, u32 expected_size);
+int btf_find_spin_lock(const struct btf *btf, const struct btf_type *t);
 
 #ifdef CONFIG_BPF_SYSCALL
 const struct btf_type *btf_type_by_id(const struct btf *btf, u32 type_id);

include/linux/filter.h

@@ -880,7 +880,9 @@ bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
 		     unsigned int alignment,
 		     bpf_jit_fill_hole_t bpf_fill_ill_insns);
 void bpf_jit_binary_free(struct bpf_binary_header *hdr);
-
+u64 bpf_jit_alloc_exec_limit(void);
+void *bpf_jit_alloc_exec(unsigned long size);
+void bpf_jit_free_exec(void *addr);
 void bpf_jit_free(struct bpf_prog *fp);
 
 int bpf_jit_get_func_addr(const struct bpf_prog *prog,

include/uapi/linux/bpf.h

@@ -267,6 +267,7 @@ enum bpf_attach_type {
 #define BPF_ANY		0 /* create new element or update existing */
 #define BPF_NOEXIST	1 /* create new element if it didn't exist */
 #define BPF_EXIST	2 /* update existing element */
+#define BPF_F_LOCK	4 /* spin_lock-ed map_lookup/map_update */
 
 /* flags for BPF_MAP_CREATE command */
 #define BPF_F_NO_PREALLOC	(1U << 0)
@@ -2422,7 +2423,9 @@ union bpf_attr {
 	FN(map_peek_elem),		\
 	FN(msg_push_data),		\
 	FN(msg_pop_data),		\
-	FN(rc_pointer_rel),
+	FN(rc_pointer_rel),		\
+	FN(spin_lock),			\
+	FN(spin_unlock),
 
 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
  * function eBPF program intends to call
@@ -3056,4 +3059,7 @@ struct bpf_line_info {
 	__u32	line_col;
 };
 
+struct bpf_spin_lock {
+	__u32	val;
+};
 #endif /* _UAPI__LINUX_BPF_H__ */

kernel/Kconfig.locks

@@ -242,6 +242,9 @@ config QUEUED_SPINLOCKS
 	def_bool y if ARCH_USE_QUEUED_SPINLOCKS
 	depends on SMP
 
+config BPF_ARCH_SPINLOCK
+	bool
+
 config ARCH_USE_QUEUED_RWLOCKS
 	bool
 

kernel/bpf/arraymap.c

@@ -253,8 +253,9 @@ static int array_map_update_elem(struct bpf_map *map, void *key, void *value,
 {
 	struct bpf_array *array = container_of(map, struct bpf_array, map);
 	u32 index = *(u32 *)key;
+	char *val;
 
-	if (unlikely(map_flags > BPF_EXIST))
+	if (unlikely((map_flags & ~BPF_F_LOCK) > BPF_EXIST))
 		/* unknown flags */
 		return -EINVAL;
 
@@ -262,17 +263,25 @@ static int array_map_update_elem(struct bpf_map *map, void *key, void *value,
 		/* all elements were pre-allocated, cannot insert a new one */
 		return -E2BIG;
 
-	if (unlikely(map_flags == BPF_NOEXIST))
+	if (unlikely(map_flags & BPF_NOEXIST))
 		/* all elements already exist */
 		return -EEXIST;
 
-	if (array->map.map_type == BPF_MAP_TYPE_PERCPU_ARRAY)
+	if (unlikely((map_flags & BPF_F_LOCK) &&
+		     !map_value_has_spin_lock(map)))
+		return -EINVAL;
+
+	if (array->map.map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
 		memcpy(this_cpu_ptr(array->pptrs[index & array->index_mask]),
 		       value, map->value_size);
-	else
-		memcpy(array->value +
-		       array->elem_size * (index & array->index_mask),
-		       value, map->value_size);
+	} else {
+		val = array->value +
+			array->elem_size * (index & array->index_mask);
+		if (map_flags & BPF_F_LOCK)
+			copy_map_value_locked(map, val, value, false);
+		else
+			copy_map_value(map, val, value);
+	}
 	return 0;
 }
 

kernel/bpf/btf.c

@@ -355,6 +355,11 @@ static bool btf_type_is_struct(const struct btf_type *t)
 	return kind == BTF_KIND_STRUCT || kind == BTF_KIND_UNION;
 }
 
+static bool __btf_type_is_struct(const struct btf_type *t)
+{
+	return BTF_INFO_KIND(t->info) == BTF_KIND_STRUCT;
+}
+
 static bool btf_type_is_array(const struct btf_type *t)
 {
 	return BTF_INFO_KIND(t->info) == BTF_KIND_ARRAY;
@@ -2045,6 +2050,43 @@ static void btf_struct_log(struct btf_verifier_env *env,
 	btf_verifier_log(env, "size=%u vlen=%u", t->size, btf_type_vlen(t));
 }
 
+/* find 'struct bpf_spin_lock' in map value.
+ * return >= 0 offset if found
+ * and < 0 in case of error
+ */
+int btf_find_spin_lock(const struct btf *btf, const struct btf_type *t)
+{
+	const struct btf_member *member;
+	u32 i, off = -ENOENT;
+
+	if (!__btf_type_is_struct(t))
+		return -EINVAL;
+
+	for_each_member(i, t, member) {
+		const struct btf_type *member_type = btf_type_by_id(btf,
+								    member->type);
+		if (!__btf_type_is_struct(member_type))
+			continue;
+		if (member_type->size != sizeof(struct bpf_spin_lock))
+			continue;
+		if (strcmp(__btf_name_by_offset(btf, member_type->name_off),
+			   "bpf_spin_lock"))
+			continue;
+		if (off != -ENOENT)
+			/* only one 'struct bpf_spin_lock' is allowed */
+			return -E2BIG;
+		off = btf_member_bit_offset(t, member);
+		if (off % 8)
+			/* valid C code cannot generate such BTF */
+			return -EINVAL;
+		off /= 8;
+		if (off % __alignof__(struct bpf_spin_lock))
+			/* valid struct bpf_spin_lock will be 4 byte aligned */
+			return -EINVAL;
+	}
+	return off;
+}
+
 static void btf_struct_seq_show(const struct btf *btf, const struct btf_type *t,
 				u32 type_id, void *data, u8 bits_offset,
 				struct seq_file *m)

kernel/bpf/cgroup.c

@@ -230,6 +230,7 @@ static int update_effective_progs(struct cgroup *cgrp,
  * @cgrp: The cgroup which descendants to traverse
  * @prog: A program to attach
  * @type: Type of attach operation
+ * @flags: Option flags
  *
  * Must be called with cgroup_mutex held.
  */
@@ -363,7 +364,7 @@ int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
  * Must be called with cgroup_mutex held.
  */
 int __cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
-			enum bpf_attach_type type, u32 unused_flags)
+			enum bpf_attach_type type)
 {
 	struct list_head *progs = &cgrp->bpf.progs[type];
 	enum bpf_cgroup_storage_type stype;

kernel/bpf/core.c

@@ -1263,8 +1263,9 @@ bool bpf_opcode_in_insntable(u8 code)
 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
 /**
  *	__bpf_prog_run - run eBPF program on a given context
- *	@ctx: is the data we are operating on
+ *	@regs: is the array of MAX_BPF_EXT_REG eBPF pseudo-registers
  *	@insn: is the array of eBPF instructions
+ *	@stack: is the eBPF storage stack
  *
  * Decode and execute eBPF instructions.
  */
@@ -2001,6 +2002,8 @@ const struct bpf_func_proto bpf_map_delete_elem_proto __weak;
 const struct bpf_func_proto bpf_map_push_elem_proto __weak;
 const struct bpf_func_proto bpf_map_pop_elem_proto __weak;
 const struct bpf_func_proto bpf_map_peek_elem_proto __weak;
+const struct bpf_func_proto bpf_spin_lock_proto __weak;
+const struct bpf_func_proto bpf_spin_unlock_proto __weak;
 
 const struct bpf_func_proto bpf_get_prandom_u32_proto __weak;
 const struct bpf_func_proto bpf_get_smp_processor_id_proto __weak;

kernel/bpf/hashtab.c

@@ -718,21 +718,12 @@ static bool fd_htab_map_needs_adjust(const struct bpf_htab *htab)
 	       BITS_PER_LONG == 64;
 }
 
-static u32 htab_size_value(const struct bpf_htab *htab, bool percpu)
-{
-	u32 size = htab->map.value_size;
-
-	if (percpu || fd_htab_map_needs_adjust(htab))
-		size = round_up(size, 8);
-	return size;
-}
-
 static struct htab_elem *alloc_htab_elem(struct bpf_htab *htab, void *key,
 					 void *value, u32 key_size, u32 hash,
 					 bool percpu, bool onallcpus,
 					 struct htab_elem *old_elem)
 {
-	u32 size = htab_size_value(htab, percpu);
+	u32 size = htab->map.value_size;
 	bool prealloc = htab_is_prealloc(htab);
 	struct htab_elem *l_new, **pl_new;
 	void __percpu *pptr;
@@ -770,10 +761,13 @@ static struct htab_elem *alloc_htab_elem(struct bpf_htab *htab, void *key,
 			l_new = ERR_PTR(-ENOMEM);
 			goto dec_count;
 		}
+		check_and_init_map_lock(&htab->map,
+					l_new->key + round_up(key_size, 8));
 	}
 
 	memcpy(l_new->key, key, key_size);
 	if (percpu) {
+		size = round_up(size, 8);
 		if (prealloc) {
 			pptr = htab_elem_get_ptr(l_new, key_size);
 		} else {
@@ -791,8 +785,13 @@ static struct htab_elem *alloc_htab_elem(struct bpf_htab *htab, void *key,
 
 		if (!prealloc)
 			htab_elem_set_ptr(l_new, key_size, pptr);
-	} else {
+	} else if (fd_htab_map_needs_adjust(htab)) {
+		size = round_up(size, 8);
 		memcpy(l_new->key + round_up(key_size, 8), value, size);
+	} else {
+		copy_map_value(&htab->map,
+			       l_new->key + round_up(key_size, 8),
+			       value);
 	}
 
 	l_new->hash = hash;
@@ -805,11 +804,11 @@ static struct htab_elem *alloc_htab_elem(struct bpf_htab *htab, void *key,
 static int check_flags(struct bpf_htab *htab, struct htab_elem *l_old,
 		       u64 map_flags)
 {
-	if (l_old && map_flags == BPF_NOEXIST)
+	if (l_old && (map_flags & ~BPF_F_LOCK) == BPF_NOEXIST)
 		/* elem already exists */
 		return -EEXIST;
 
-	if (!l_old && map_flags == BPF_EXIST)
+	if (!l_old && (map_flags & ~BPF_F_LOCK) == BPF_EXIST)
 		/* elem doesn't exist, cannot update it */
 		return -ENOENT;
 
@@ -828,7 +827,7 @@ static int htab_map_update_elem(struct bpf_map *map, void *key, void *value,
 	u32 key_size, hash;
 	int ret;
 
-	if (unlikely(map_flags > BPF_EXIST))
+	if (unlikely((map_flags & ~BPF_F_LOCK) > BPF_EXIST))
 		/* unknown flags */
 		return -EINVAL;
 
@@ -841,6 +840,28 @@ static int htab_map_update_elem(struct bpf_map *map, void *key, void *value,
 	b = __select_bucket(htab, hash);
 	head = &b->head;
 
+	if (unlikely(map_flags & BPF_F_LOCK)) {
+		if (unlikely(!map_value_has_spin_lock(map)))
+			return -EINVAL;
+		/* find an element without taking the bucket lock */
+		l_old = lookup_nulls_elem_raw(head, hash, key, key_size,
+					      htab->n_buckets);
+		ret = check_flags(htab, l_old, map_flags);
+		if (ret)
+			return ret;
+		if (l_old) {
+			/* grab the element lock and update value in place */
+			copy_map_value_locked(map,
+					      l_old->key + round_up(key_size, 8),
+					      value, false);
+			return 0;
+		}
+		/* fall through, grab the bucket lock and lookup again.
+		 * 99.9% chance that the element won't be found,
+		 * but second lookup under lock has to be done.
+		 */
+	}
+
 	/* bpf_map_update_elem() can be called in_irq() */
 	raw_spin_lock_irqsave(&b->lock, flags);
 
@@ -850,6 +871,20 @@ static int htab_map_update_elem(struct bpf_map *map, void *key, void *value,
 	if (ret)
 		goto err;
 
+	if (unlikely(l_old && (map_flags & BPF_F_LOCK))) {
+		/* first lookup without the bucket lock didn't find the element,
+		 * but second lookup with the bucket lock found it.
+		 * This case is highly unlikely, but has to be dealt with:
+		 * grab the element lock in addition to the bucket lock
+		 * and update element in place
+		 */
+		copy_map_value_locked(map,
+				      l_old->key + round_up(key_size, 8),
+				      value, false);
+		ret = 0;
+		goto err;
+	}
+
 	l_new = alloc_htab_elem(htab, key, value, key_size, hash, false, false,
 				l_old);
 	if (IS_ERR(l_new)) {

kernel/bpf/helpers.c

@@ -221,6 +221,102 @@ const struct bpf_func_proto bpf_get_current_comm_proto = {
 	.arg2_type	= ARG_CONST_SIZE,
 };
 
+#if defined(CONFIG_QUEUED_SPINLOCKS) || defined(CONFIG_BPF_ARCH_SPINLOCK)
+
+static inline void __bpf_spin_lock(struct bpf_spin_lock *lock)
+{
+	arch_spinlock_t *l = (void *)lock;
+	union {
+		__u32 val;
+		arch_spinlock_t lock;
+	} u = { .lock = __ARCH_SPIN_LOCK_UNLOCKED };
+
+	compiletime_assert(u.val == 0, "__ARCH_SPIN_LOCK_UNLOCKED not 0");
+	BUILD_BUG_ON(sizeof(*l) != sizeof(__u32));
+	BUILD_BUG_ON(sizeof(*lock) != sizeof(__u32));
+	arch_spin_lock(l);
+}
+
+static inline void __bpf_spin_unlock(struct bpf_spin_lock *lock)
+{
+	arch_spinlock_t *l = (void *)lock;
+
+	arch_spin_unlock(l);
+}
+
+#else
+
+static inline void __bpf_spin_lock(struct bpf_spin_lock *lock)
+{
+	atomic_t *l = (void *)lock;
+
+	BUILD_BUG_ON(sizeof(*l) != sizeof(*lock));
+	do {
+		atomic_cond_read_relaxed(l, !VAL);
+	} while (atomic_xchg(l, 1));
+}
+
+static inline void __bpf_spin_unlock(struct bpf_spin_lock *lock)
+{
+	atomic_t *l = (void *)lock;
+
+	atomic_set_release(l, 0);
+}
+
+#endif
+
+static DEFINE_PER_CPU(unsigned long, irqsave_flags);
+
+notrace BPF_CALL_1(bpf_spin_lock, struct bpf_spin_lock *, lock)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	__bpf_spin_lock(lock);
+	__this_cpu_write(irqsave_flags, flags);
+	return 0;
+}
+
+const struct bpf_func_proto bpf_spin_lock_proto = {
+	.func		= bpf_spin_lock,
+	.gpl_only	= false,
+	.ret_type	= RET_VOID,
+	.arg1_type	= ARG_PTR_TO_SPIN_LOCK,
+};
+
+notrace BPF_CALL_1(bpf_spin_unlock, struct bpf_spin_lock *, lock)
+{
+	unsigned long flags;
+
+	flags = __this_cpu_read(irqsave_flags);
+	__bpf_spin_unlock(lock);
+	local_irq_restore(flags);
+	return 0;
+}
+
+const struct bpf_func_proto bpf_spin_unlock_proto = {
+	.func		= bpf_spin_unlock,
+	.gpl_only	= false,
+	.ret_type	= RET_VOID,
+	.arg1_type	= ARG_PTR_TO_SPIN_LOCK,
+};
+
+void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
+			   bool lock_src)
+{
+	struct bpf_spin_lock *lock;
+
+	if (lock_src)
+		lock = src + map->spin_lock_off;
+	else
+		lock = dst + map->spin_lock_off;
+	preempt_disable();
+	____bpf_spin_lock(lock);
+	copy_map_value(map, dst, src);
+	____bpf_spin_unlock(lock);
+	preempt_enable();
+}
+
 #ifdef CONFIG_CGROUPS
 BPF_CALL_0(bpf_get_current_cgroup_id)
 {

kernel/bpf/local_storage.c

@@ -131,7 +131,14 @@ static int cgroup_storage_update_elem(struct bpf_map *map, void *_key,
 	struct bpf_cgroup_storage *storage;
 	struct bpf_storage_buffer *new;
 
-	if (flags != BPF_ANY && flags != BPF_EXIST)
+	if (unlikely(flags & ~(BPF_F_LOCK | BPF_EXIST | BPF_NOEXIST)))
+		return -EINVAL;
+
+	if (unlikely(flags & BPF_NOEXIST))
+		return -EINVAL;
+
+	if (unlikely((flags & BPF_F_LOCK) &&
+		     !map_value_has_spin_lock(map)))
 		return -EINVAL;
 
 	storage = cgroup_storage_lookup((struct bpf_cgroup_storage_map *)map,
@@ -139,6 +146,11 @@ static int cgroup_storage_update_elem(struct bpf_map *map, void *_key,
 	if (!storage)
 		return -ENOENT;
 
+	if (flags & BPF_F_LOCK) {
+		copy_map_value_locked(map, storage->buf->data, value, false);
+		return 0;
+	}
+
 	new = kmalloc_node(sizeof(struct bpf_storage_buffer) +
 			   map->value_size,
 			   __GFP_ZERO | GFP_ATOMIC | __GFP_NOWARN,
@@ -147,6 +159,7 @@ static int cgroup_storage_update_elem(struct bpf_map *map, void *_key,
 		return -ENOMEM;
 
 	memcpy(&new->data[0], value, map->value_size);
+	check_and_init_map_lock(map, new->data);
 
 	new = xchg(&storage->buf, new);
 	kfree_rcu(new, rcu);
@@ -483,6 +496,7 @@ struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(struct bpf_prog *prog,
 		storage->buf = kmalloc_node(size, flags, map->numa_node);
 		if (!storage->buf)
 			goto enomem;
+		check_and_init_map_lock(map, storage->buf->data);
 	} else {
 		storage->percpu_buf = __alloc_percpu_gfp(size, 8, flags);
 		if (!storage->percpu_buf)

kernel/bpf/map_in_map.c

@@ -37,6 +37,11 @@ struct bpf_map *bpf_map_meta_alloc(int inner_map_ufd)
 		return ERR_PTR(-EINVAL);
 	}
 
+	if (map_value_has_spin_lock(inner_map)) {
+		fdput(f);
+		return ERR_PTR(-ENOTSUPP);
+	}
+
 	inner_map_meta_size = sizeof(*inner_map_meta);
 	/* In some cases verifier needs to access beyond just base map. */
 	if (inner_map->ops == &array_map_ops)

kernel/bpf/syscall.c

@@ -463,7 +463,7 @@ int map_check_no_btf(const struct bpf_map *map,
 	return -ENOTSUPP;
 }
 
-static int map_check_btf(const struct bpf_map *map, const struct btf *btf,
+static int map_check_btf(struct bpf_map *map, const struct btf *btf,
 			 u32 btf_key_id, u32 btf_value_id)
 {
 	const struct btf_type *key_type, *value_type;
@@ -478,6 +478,22 @@ static int map_check_btf(const struct bpf_map *map, const struct btf *btf,
 	if (!value_type || value_size != map->value_size)
 		return -EINVAL;
 
+	map->spin_lock_off = btf_find_spin_lock(btf, value_type);
+
+	if (map_value_has_spin_lock(map)) {
+		if (map->map_type != BPF_MAP_TYPE_HASH &&
+		    map->map_type != BPF_MAP_TYPE_ARRAY &&
+		    map->map_type != BPF_MAP_TYPE_CGROUP_STORAGE)
+			return -ENOTSUPP;
+		if (map->spin_lock_off + sizeof(struct bpf_spin_lock) >
+		    map->value_size) {
+			WARN_ONCE(1,
+				  "verifier bug spin_lock_off %d value_size %d\n",
+				  map->spin_lock_off, map->value_size);
+			return -EFAULT;
+		}
+	}
+
 	if (map->ops->map_check_btf)
 		ret = map->ops->map_check_btf(map, btf, key_type, value_type);
 
@@ -542,6 +558,8 @@ static int map_create(union bpf_attr *attr)
 		map->btf = btf;
 		map->btf_key_type_id = attr->btf_key_type_id;
 		map->btf_value_type_id = attr->btf_value_type_id;
+	} else {
+		map->spin_lock_off = -EINVAL;
 	}
 
 	err = security_bpf_map_alloc(map);
@@ -664,7 +682,7 @@ static void *__bpf_copy_key(void __user *ukey, u64 key_size)
 }
 
 /* last field in 'union bpf_attr' used by this command */
-#define BPF_MAP_LOOKUP_ELEM_LAST_FIELD value
+#define BPF_MAP_LOOKUP_ELEM_LAST_FIELD flags
 
 static int map_lookup_elem(union bpf_attr *attr)
 {
@@ -680,6 +698,9 @@ static int map_lookup_elem(union bpf_attr *attr)
 	if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM))
 		return -EINVAL;
 
+	if (attr->flags & ~BPF_F_LOCK)
+		return -EINVAL;
+
 	f = fdget(ufd);
 	map = __bpf_map_get(f);
 	if (IS_ERR(map))
@@ -690,6 +711,12 @@ static int map_lookup_elem(union bpf_attr *attr)
 		goto err_put;
 	}
 
+	if ((attr->flags & BPF_F_LOCK) &&
+	    !map_value_has_spin_lock(map)) {
+		err = -EINVAL;
+		goto err_put;
+	}
+
 	key = __bpf_copy_key(ukey, map->key_size);
 	if (IS_ERR(key)) {
 		err = PTR_ERR(key);
@@ -740,7 +767,13 @@ static int map_lookup_elem(union bpf_attr *attr)
 			err = -ENOENT;
 		} else {
 			err = 0;
-			memcpy(value, ptr, value_size);
+			if (attr->flags & BPF_F_LOCK)
+				/* lock 'ptr' and copy everything but lock */
+				copy_map_value_locked(map, value, ptr, true);
+			else
+				copy_map_value(map, value, ptr);
+			/* mask lock, since value wasn't zero inited */
+			check_and_init_map_lock(map, value);
 		}
 		rcu_read_unlock();
 	}
@@ -800,6 +833,12 @@ static int map_update_elem(union bpf_attr *attr)
 		goto err_put;
 	}
 
+	if ((attr->flags & BPF_F_LOCK) &&
+	    !map_value_has_spin_lock(map)) {
+		err = -EINVAL;
+		goto err_put;
+	}
+
 	key = __bpf_copy_key(ukey, map->key_size);
 	if (IS_ERR(key)) {
 		err = PTR_ERR(key);

kernel/bpf/verifier.c

@@ -213,6 +213,7 @@ struct bpf_call_arg_meta {
 	s64 msize_smax_value;
 	u64 msize_umax_value;
 	int ptr_id;
+	int func_id;
 };
 
 static DEFINE_MUTEX(bpf_verifier_lock);
@@ -351,6 +352,12 @@ static bool reg_is_refcounted(const struct bpf_reg_state *reg)
 	return type_is_refcounted(reg->type);
 }
 
+static bool reg_may_point_to_spin_lock(const struct bpf_reg_state *reg)
+{
+	return reg->type == PTR_TO_MAP_VALUE &&
+		map_value_has_spin_lock(reg->map_ptr);
+}
+
 static bool reg_is_refcounted_or_null(const struct bpf_reg_state *reg)
 {
 	return type_is_refcounted_or_null(reg->type);
@@ -712,6 +719,7 @@ static int copy_verifier_state(struct bpf_verifier_state *dst_state,
 	}
 	dst_state->speculative = src->speculative;
 	dst_state->curframe = src->curframe;
+	dst_state->active_spin_lock = src->active_spin_lock;
 	for (i = 0; i <= src->curframe; i++) {
 		dst = dst_state->frame[i];
 		if (!dst) {
@@ -1483,6 +1491,21 @@ static int check_map_access(struct bpf_verifier_env *env, u32 regno,
 	if (err)
 		verbose(env, "R%d max value is outside of the array range\n",
 			regno);
+
+	if (map_value_has_spin_lock(reg->map_ptr)) {
+		u32 lock = reg->map_ptr->spin_lock_off;
+
+		/* if any part of struct bpf_spin_lock can be touched by
+		 * load/store reject this program.
+		 * To check that [x1, x2) overlaps with [y1, y2)
+		 * it is sufficient to check x1 < y2 && y1 < x2.
+		 */
+		if (reg->smin_value + off < lock + sizeof(struct bpf_spin_lock) &&
+		     lock < reg->umax_value + off + size) {
+			verbose(env, "bpf_spin_lock cannot be accessed directly by load/store\n");
+			return -EACCES;
+		}
+	}
 	return err;
 }
 
@@ -2192,6 +2215,91 @@ static int check_helper_mem_access(struct bpf_verifier_env *env, int regno,
 	}
 }
 
+/* Implementation details:
+ * bpf_map_lookup returns PTR_TO_MAP_VALUE_OR_NULL
+ * Two bpf_map_lookups (even with the same key) will have different reg->id.
+ * For traditional PTR_TO_MAP_VALUE the verifier clears reg->id after
+ * value_or_null->value transition, since the verifier only cares about
+ * the range of access to valid map value pointer and doesn't care about actual
+ * address of the map element.
+ * For maps with 'struct bpf_spin_lock' inside map value the verifier keeps
+ * reg->id > 0 after value_or_null->value transition. By doing so
+ * two bpf_map_lookups will be considered two different pointers that
+ * point to different bpf_spin_locks.
+ * The verifier allows taking only one bpf_spin_lock at a time to avoid
+ * dead-locks.
+ * Since only one bpf_spin_lock is allowed the checks are simpler than
+ * reg_is_refcounted() logic. The verifier needs to remember only
+ * one spin_lock instead of array of acquired_refs.
+ * cur_state->active_spin_lock remembers which map value element got locked
+ * and clears it after bpf_spin_unlock.
+ */
+static int process_spin_lock(struct bpf_verifier_env *env, int regno,
+			     bool is_lock)
+{
+	struct bpf_reg_state *regs = cur_regs(env), *reg = &regs[regno];
+	struct bpf_verifier_state *cur = env->cur_state;
+	bool is_const = tnum_is_const(reg->var_off);
+	struct bpf_map *map = reg->map_ptr;
+	u64 val = reg->var_off.value;
+
+	if (reg->type != PTR_TO_MAP_VALUE) {
+		verbose(env, "R%d is not a pointer to map_value\n", regno);
+		return -EINVAL;
+	}
+	if (!is_const) {
+		verbose(env,
+			"R%d doesn't have constant offset. bpf_spin_lock has to be at the constant offset\n",
+			regno);
+		return -EINVAL;
+	}
+	if (!map->btf) {
+		verbose(env,
+			"map '%s' has to have BTF in order to use bpf_spin_lock\n",
+			map->name);
+		return -EINVAL;
+	}
+	if (!map_value_has_spin_lock(map)) {
+		if (map->spin_lock_off == -E2BIG)
+			verbose(env,
+				"map '%s' has more than one 'struct bpf_spin_lock'\n",
+				map->name);
+		else if (map->spin_lock_off == -ENOENT)
+			verbose(env,
+				"map '%s' doesn't have 'struct bpf_spin_lock'\n",
+				map->name);
+		else
+			verbose(env,
+				"map '%s' is not a struct type or bpf_spin_lock is mangled\n",
+				map->name);
+		return -EINVAL;
+	}
+	if (map->spin_lock_off != val + reg->off) {
+		verbose(env, "off %lld doesn't point to 'struct bpf_spin_lock'\n",
+			val + reg->off);
+		return -EINVAL;
+	}
+	if (is_lock) {
+		if (cur->active_spin_lock) {
+			verbose(env,
+				"Locking two bpf_spin_locks are not allowed\n");
+			return -EINVAL;
+		}
+		cur->active_spin_lock = reg->id;
+	} else {
+		if (!cur->active_spin_lock) {
+			verbose(env, "bpf_spin_unlock without taking a lock\n");
+			return -EINVAL;
+		}
+		if (cur->active_spin_lock != reg->id) {
+			verbose(env, "bpf_spin_unlock of different lock\n");
+			return -EINVAL;
+		}
+		cur->active_spin_lock = 0;
+	}
+	return 0;
+}
+
 static bool arg_type_is_mem_ptr(enum bpf_arg_type type)
 {
 	return type == ARG_PTR_TO_MEM ||
@@ -2268,6 +2376,17 @@ static int check_func_arg(struct bpf_verifier_env *env, u32 regno,
 			return -EFAULT;
 		}
 		meta->ptr_id = reg->id;
+	} else if (arg_type == ARG_PTR_TO_SPIN_LOCK) {
+		if (meta->func_id == BPF_FUNC_spin_lock) {
+			if (process_spin_lock(env, regno, true))
+				return -EACCES;
+		} else if (meta->func_id == BPF_FUNC_spin_unlock) {
+			if (process_spin_lock(env, regno, false))
+				return -EACCES;
+		} else {
+			verbose(env, "verifier internal error\n");
+			return -EFAULT;
+		}
 	} else if (arg_type_is_mem_ptr(arg_type)) {
 		expected_type = PTR_TO_STACK;
 		/* One exception here. In case function allows for NULL to be
@@ -2887,6 +3006,7 @@ static int check_helper_call(struct bpf_verifier_env *env, int func_id, int insn
 		return err;
 	}
 
+	meta.func_id = func_id;
 	/* check args */
 	err = check_func_arg(env, BPF_REG_1, fn->arg1_type, &meta);
 	if (err)
@@ -2969,6 +3089,8 @@ static int check_helper_call(struct bpf_verifier_env *env, int func_id, int insn
 		regs[BPF_REG_0].map_ptr = meta.map_ptr;
 		if (fn->ret_type == RET_PTR_TO_MAP_VALUE) {
 			regs[BPF_REG_0].type = PTR_TO_MAP_VALUE;
+			if (map_value_has_spin_lock(meta.map_ptr))
+				regs[BPF_REG_0].id = ++env->id_gen;
 		} else {
 			regs[BPF_REG_0].type = PTR_TO_MAP_VALUE_OR_NULL;
 			regs[BPF_REG_0].id = ++env->id_gen;
@@ -4473,7 +4595,8 @@ static void mark_ptr_or_null_reg(struct bpf_func_state *state,
 		} else if (reg->type == PTR_TO_SOCKET_OR_NULL) {
 			reg->type = PTR_TO_SOCKET;
 		}
-		if (is_null || !reg_is_refcounted(reg)) {
+		if (is_null || !(reg_is_refcounted(reg) ||
+				 reg_may_point_to_spin_lock(reg))) {
 			/* We don't need id from this point onwards anymore,
 			 * thus we should better reset it, so that state
 			 * pruning has chances to take effect.
@@ -4871,6 +4994,11 @@ static int check_ld_abs(struct bpf_verifier_env *env, struct bpf_insn *insn)
 		return err;
 	}
 
+	if (env->cur_state->active_spin_lock) {
+		verbose(env, "BPF_LD_[ABS|IND] cannot be used inside bpf_spin_lock-ed region\n");
+		return -EINVAL;
+	}
+
 	if (regs[BPF_REG_6].type != PTR_TO_CTX) {
 		verbose(env,
 			"at the time of BPF_LD_ABS|IND R6 != pointer to skb\n");
@@ -5607,8 +5735,11 @@ static bool regsafe(struct bpf_reg_state *rold, struct bpf_reg_state *rcur,
 	case PTR_TO_MAP_VALUE:
 		/* If the new min/max/var_off satisfy the old ones and
 		 * everything else matches, we are OK.
-		 * We don't care about the 'id' value, because nothing
-		 * uses it for PTR_TO_MAP_VALUE (only for ..._OR_NULL)
+		 * 'id' is not compared, since it's only used for maps with
+		 * bpf_spin_lock inside map element and in such cases if
+		 * the rest of the prog is valid for one map element then
+		 * it's valid for all map elements regardless of the key
+		 * used in bpf_map_lookup()
 		 */
 		return memcmp(rold, rcur, offsetof(struct bpf_reg_state, id)) == 0 &&
 		       range_within(rold, rcur) &&
@@ -5811,6 +5942,9 @@ static bool states_equal(struct bpf_verifier_env *env,
 	if (old->speculative && !cur->speculative)
 		return false;
 
+	if (old->active_spin_lock != cur->active_spin_lock)
+		return false;
+
 	/* for states to be equal callsites have to be the same
 	 * and all frame states need to be equivalent
 	 */
@@ -6229,6 +6363,12 @@ static int do_check(struct bpf_verifier_env *env)
 					return -EINVAL;
 				}
 
+				if (env->cur_state->active_spin_lock &&
+				    (insn->src_reg == BPF_PSEUDO_CALL ||
+				     insn->imm != BPF_FUNC_spin_unlock)) {
+					verbose(env, "function calls are not allowed while holding a lock\n");
+					return -EINVAL;
+				}
 				if (insn->src_reg == BPF_PSEUDO_CALL)
 					err = check_func_call(env, insn, &env->insn_idx);
 				else
@@ -6259,6 +6399,11 @@ static int do_check(struct bpf_verifier_env *env)
 					return -EINVAL;
 				}
 
+				if (env->cur_state->active_spin_lock) {
+					verbose(env, "bpf_spin_unlock is missing\n");
+					return -EINVAL;
+				}
+
 				if (state->curframe) {
 					/* exit from nested function */
 					env->prev_insn_idx = env->insn_idx;
@@ -6356,6 +6501,19 @@ static int check_map_prealloc(struct bpf_map *map)
 		!(map->map_flags & BPF_F_NO_PREALLOC);
 }
 
+static bool is_tracing_prog_type(enum bpf_prog_type type)
+{
+	switch (type) {
+	case BPF_PROG_TYPE_KPROBE:
+	case BPF_PROG_TYPE_TRACEPOINT:
+	case BPF_PROG_TYPE_PERF_EVENT:
+	case BPF_PROG_TYPE_RAW_TRACEPOINT:
+		return true;
+	default:
+		return false;
+	}
+}
+
 static int check_map_prog_compatibility(struct bpf_verifier_env *env,
 					struct bpf_map *map,
 					struct bpf_prog *prog)
@@ -6378,6 +6536,13 @@ static int check_map_prog_compatibility(struct bpf_verifier_env *env,
 		}
 	}
 
+	if ((is_tracing_prog_type(prog->type) ||
+	     prog->type == BPF_PROG_TYPE_SOCKET_FILTER) &&
+	    map_value_has_spin_lock(map)) {
+		verbose(env, "tracing progs cannot use bpf_spin_lock yet\n");
+		return -EINVAL;
+	}
+
 	if ((bpf_prog_is_dev_bound(prog->aux) || bpf_map_is_dev_bound(map)) &&
 	    !bpf_offload_prog_map_match(prog, map)) {
 		verbose(env, "offload device mismatch between prog and map\n");

kernel/cgroup/cgroup.c

@@ -5996,7 +5996,7 @@ int cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
 	int ret;
 
 	mutex_lock(&cgroup_mutex);
-	ret = __cgroup_bpf_detach(cgrp, prog, type, flags);
+	ret = __cgroup_bpf_detach(cgrp, prog, type);
 	mutex_unlock(&cgroup_mutex);
 	return ret;
 }

net/core/dev.c

@@ -7983,8 +7983,10 @@ int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
 	query = flags & XDP_FLAGS_HW_MODE ? XDP_QUERY_PROG_HW : XDP_QUERY_PROG;
 
 	bpf_op = bpf_chk = ops->ndo_bpf;
-	if (!bpf_op && (flags & (XDP_FLAGS_DRV_MODE | XDP_FLAGS_HW_MODE)))
+	if (!bpf_op && (flags & (XDP_FLAGS_DRV_MODE | XDP_FLAGS_HW_MODE))) {
+		NL_SET_ERR_MSG(extack, "underlying driver does not support XDP in native mode");
 		return -EOPNOTSUPP;
+	}
 	if (!bpf_op || (flags & XDP_FLAGS_SKB_MODE))
 		bpf_op = generic_xdp_install;
 	if (bpf_op == bpf_chk)
@@ -7992,11 +7994,15 @@ int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
 
 	if (fd >= 0) {
 		if (__dev_xdp_query(dev, bpf_chk, XDP_QUERY_PROG) ||
-		    __dev_xdp_query(dev, bpf_chk, XDP_QUERY_PROG_HW))
+		    __dev_xdp_query(dev, bpf_chk, XDP_QUERY_PROG_HW)) {
+			NL_SET_ERR_MSG(extack, "native and generic XDP can't be active at the same time");
 			return -EEXIST;
+		}
 		if ((flags & XDP_FLAGS_UPDATE_IF_NOEXIST) &&
-		    __dev_xdp_query(dev, bpf_op, query))
+		    __dev_xdp_query(dev, bpf_op, query)) {
+			NL_SET_ERR_MSG(extack, "XDP program already attached");
 			return -EBUSY;
+		}
 
 		prog = bpf_prog_get_type_dev(fd, BPF_PROG_TYPE_XDP,
 					     bpf_op == ops->ndo_bpf);

net/core/filter.c

@@ -5314,10 +5314,20 @@ bpf_base_func_proto(enum bpf_func_id func_id)
 		return &bpf_tail_call_proto;
 	case BPF_FUNC_ktime_get_ns:
 		return &bpf_ktime_get_ns_proto;
+	default:
+		break;
+	}
+
+	if (!capable(CAP_SYS_ADMIN))
+		return NULL;
+
+	switch (func_id) {
+	case BPF_FUNC_spin_lock:
+		return &bpf_spin_lock_proto;
+	case BPF_FUNC_spin_unlock:
+		return &bpf_spin_unlock_proto;
 	case BPF_FUNC_trace_printk:
-		if (capable(CAP_SYS_ADMIN))
-			return bpf_get_trace_printk_proto();
-		/* else, fall through */
+		return bpf_get_trace_printk_proto();
 	default:
 		return NULL;
 	}

samples/bpf/Makefile

@@ -87,18 +87,18 @@ test_cgrp2_sock2-objs := bpf_load.o test_cgrp2_sock2.o
 xdp1-objs := xdp1_user.o
 # reuse xdp1 source intentionally
 xdp2-objs := xdp1_user.o
-xdp_router_ipv4-objs := bpf_load.o xdp_router_ipv4_user.o
+xdp_router_ipv4-objs := xdp_router_ipv4_user.o
 test_current_task_under_cgroup-objs := bpf_load.o $(CGROUP_HELPERS) \
 				       test_current_task_under_cgroup_user.o
 trace_event-objs := bpf_load.o trace_event_user.o $(TRACE_HELPERS)
 sampleip-objs := bpf_load.o sampleip_user.o $(TRACE_HELPERS)
 tc_l2_redirect-objs := bpf_load.o tc_l2_redirect_user.o
 lwt_len_hist-objs := bpf_load.o lwt_len_hist_user.o
-xdp_tx_iptunnel-objs := bpf_load.o xdp_tx_iptunnel_user.o
+xdp_tx_iptunnel-objs := xdp_tx_iptunnel_user.o
 test_map_in_map-objs := bpf_load.o test_map_in_map_user.o
 per_socket_stats_example-objs := cookie_uid_helper_example.o
-xdp_redirect-objs := bpf_load.o xdp_redirect_user.o
-xdp_redirect_map-objs := bpf_load.o xdp_redirect_map_user.o
+xdp_redirect-objs := xdp_redirect_user.o
+xdp_redirect_map-objs := xdp_redirect_map_user.o
 xdp_redirect_cpu-objs := bpf_load.o xdp_redirect_cpu_user.o
 xdp_monitor-objs := bpf_load.o xdp_monitor_user.o
 xdp_rxq_info-objs := xdp_rxq_info_user.o

samples/bpf/xdp1_user.c

@@ -22,11 +22,23 @@
 #include "bpf/libbpf.h"
 
 static int ifindex;
-static __u32 xdp_flags;
+static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
+static __u32 prog_id;
 
 static void int_exit(int sig)
 {
-	bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
+	__u32 curr_prog_id = 0;
+
+	if (bpf_get_link_xdp_id(ifindex, &curr_prog_id, xdp_flags)) {
+		printf("bpf_get_link_xdp_id failed\n");
+		exit(1);
+	}
+	if (prog_id == curr_prog_id)
+		bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
+	else if (!curr_prog_id)
+		printf("couldn't find a prog id on a given interface\n");
+	else
+		printf("program on interface changed, not removing\n");
 	exit(0);
 }
 
@@ -63,7 +75,8 @@ static void usage(const char *prog)
 		"usage: %s [OPTS] IFACE\n\n"
 		"OPTS:\n"
 		"    -S    use skb-mode\n"
-		"    -N    enforce native mode\n",
+		"    -N    enforce native mode\n"
+		"    -F    force loading prog\n",
 		prog);
 }
 
@@ -73,11 +86,14 @@ int main(int argc, char **argv)
 	struct bpf_prog_load_attr prog_load_attr = {
 		.prog_type	= BPF_PROG_TYPE_XDP,
 	};
-	const char *optstr = "SN";
+	struct bpf_prog_info info = {};
+	__u32 info_len = sizeof(info);
+	const char *optstr = "FSN";
 	int prog_fd, map_fd, opt;
 	struct bpf_object *obj;
 	struct bpf_map *map;
 	char filename[256];
+	int err;
 
 	while ((opt = getopt(argc, argv, optstr)) != -1) {
 		switch (opt) {
@@ -87,6 +103,9 @@ int main(int argc, char **argv)
 		case 'N':
 			xdp_flags |= XDP_FLAGS_DRV_MODE;
 			break;
+		case 'F':
+			xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
+			break;
 		default:
 			usage(basename(argv[0]));
 			return 1;
@@ -135,6 +154,13 @@ int main(int argc, char **argv)
 		return 1;
 	}
 
+	err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
+	if (err) {
+		printf("can't get prog info - %s\n", strerror(errno));
+		return err;
+	}
+	prog_id = info.id;
+
 	poll_stats(map_fd, 2);
 
 	return 0;

samples/bpf/xdp_adjust_tail_user.c

@@ -24,12 +24,25 @@
 #define STATS_INTERVAL_S 2U
 
 static int ifindex = -1;
-static __u32 xdp_flags;
+static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
+static __u32 prog_id;
 
 static void int_exit(int sig)
 {
-	if (ifindex > -1)
-		bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
+	__u32 curr_prog_id = 0;
+
+	if (ifindex > -1) {
+		if (bpf_get_link_xdp_id(ifindex, &curr_prog_id, xdp_flags)) {
+			printf("bpf_get_link_xdp_id failed\n");
+			exit(1);
+		}
+		if (prog_id == curr_prog_id)
+			bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
+		else if (!curr_prog_id)
+			printf("couldn't find a prog id on a given iface\n");
+		else
+			printf("program on interface changed, not removing\n");
+	}
 	exit(0);
 }
 
@@ -60,6 +73,7 @@ static void usage(const char *cmd)
 	printf("    -T <stop-after-X-seconds> Default: 0 (forever)\n");
 	printf("    -S use skb-mode\n");
 	printf("    -N enforce native mode\n");
+	printf("    -F force loading prog\n");
 	printf("    -h Display this help\n");
 }
 
@@ -70,12 +84,15 @@ int main(int argc, char **argv)
 		.prog_type	= BPF_PROG_TYPE_XDP,
 	};
 	unsigned char opt_flags[256] = {};
+	const char *optstr = "i:T:SNFh";
+	struct bpf_prog_info info = {};
+	__u32 info_len = sizeof(info);
 	unsigned int kill_after_s = 0;
-	const char *optstr = "i:T:SNh";
 	int i, prog_fd, map_fd, opt;
 	struct bpf_object *obj;
 	struct bpf_map *map;
 	char filename[256];
+	int err;
 
 	for (i = 0; i < strlen(optstr); i++)
 		if (optstr[i] != 'h' && 'a' <= optstr[i] && optstr[i] <= 'z')
@@ -96,6 +113,9 @@ int main(int argc, char **argv)
 		case 'N':
 			xdp_flags |= XDP_FLAGS_DRV_MODE;
 			break;
+		case 'F':
+			xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
+			break;
 		default:
 			usage(argv[0]);
 			return 1;
@@ -142,9 +162,15 @@ int main(int argc, char **argv)
 		return 1;
 	}
 
-	poll_stats(map_fd, kill_after_s);
+	err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
+	if (err) {
+		printf("can't get prog info - %s\n", strerror(errno));
+		return 1;
+	}
+	prog_id = info.id;
 
-	bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
+	poll_stats(map_fd, kill_after_s);
+	int_exit(0);
 
 	return 0;
 }

samples/bpf/xdp_redirect_cpu_user.c

@@ -24,20 +24,26 @@ static const char *__doc__ =
 /* How many xdp_progs are defined in _kern.c */
 #define MAX_PROG 6
 
-/* Wanted to get rid of bpf_load.h and fake-"libbpf.h" (and instead
- * use bpf/libbpf.h), but cannot as (currently) needed for XDP
- * attaching to a device via bpf_set_link_xdp_fd()
- */
 #include <bpf/bpf.h>
-#include "bpf_load.h"
+#include "bpf/libbpf.h"
 
 #include "bpf_util.h"
 
 static int ifindex = -1;
 static char ifname_buf[IF_NAMESIZE];
 static char *ifname;
+static __u32 prog_id;
 
-static __u32 xdp_flags;
+static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
+static int cpu_map_fd;
+static int rx_cnt_map_fd;
+static int redirect_err_cnt_map_fd;
+static int cpumap_enqueue_cnt_map_fd;
+static int cpumap_kthread_cnt_map_fd;
+static int cpus_available_map_fd;
+static int cpus_count_map_fd;
+static int cpus_iterator_map_fd;
+static int exception_cnt_map_fd;
 
 /* Exit return codes */
 #define EXIT_OK		0
@@ -51,27 +57,50 @@ static const struct option long_options[] = {
 	{"help",	no_argument,		NULL, 'h' },
 	{"dev",		required_argument,	NULL, 'd' },
 	{"skb-mode",	no_argument,		NULL, 'S' },
-	{"debug",	no_argument,		NULL, 'D' },
 	{"sec",		required_argument,	NULL, 's' },
-	{"prognum",	required_argument,	NULL, 'p' },
+	{"progname",	required_argument,	NULL, 'p' },
 	{"qsize",	required_argument,	NULL, 'q' },
 	{"cpu",		required_argument,	NULL, 'c' },
 	{"stress-mode", no_argument,		NULL, 'x' },
 	{"no-separators", no_argument,		NULL, 'z' },
+	{"force",	no_argument,		NULL, 'F' },
 	{0, 0, NULL,  0 }
 };
 
 static void int_exit(int sig)
 {
-	fprintf(stderr,
-		"Interrupted: Removing XDP program on ifindex:%d device:%s\n",
-		ifindex, ifname);
-	if (ifindex > -1)
-		bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
+	__u32 curr_prog_id = 0;
+
+	if (ifindex > -1) {
+		if (bpf_get_link_xdp_id(ifindex, &curr_prog_id, xdp_flags)) {
+			printf("bpf_get_link_xdp_id failed\n");
+			exit(EXIT_FAIL);
+		}
+		if (prog_id == curr_prog_id) {
+			fprintf(stderr,
+				"Interrupted: Removing XDP program on ifindex:%d device:%s\n",
+				ifindex, ifname);
+			bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
+		} else if (!curr_prog_id) {
+			printf("couldn't find a prog id on a given iface\n");
+		} else {
+			printf("program on interface changed, not removing\n");
+		}
+	}
 	exit(EXIT_OK);
 }
 
-static void usage(char *argv[])
+static void print_avail_progs(struct bpf_object *obj)
+{
+	struct bpf_program *pos;
+
+	bpf_object__for_each_program(pos, obj) {
+		if (bpf_program__is_xdp(pos))
+			printf(" %s\n", bpf_program__title(pos, false));
+	}
+}
+
+static void usage(char *argv[], struct bpf_object *obj)
 {
 	int i;
 
@@ -89,6 +118,8 @@ static void usage(char *argv[])
 				long_options[i].val);
 		printf("\n");
 	}
+	printf("\n Programs to be used for --progname:\n");
+	print_avail_progs(obj);
 	printf("\n");
 }
 
@@ -263,7 +294,7 @@ static __u64 calc_errs_pps(struct datarec *r,
 
 static void stats_print(struct stats_record *stats_rec,
 			struct stats_record *stats_prev,
-			int prog_num)
+			char *prog_name)
 {
 	unsigned int nr_cpus = bpf_num_possible_cpus();
 	double pps = 0, drop = 0, err = 0;
@@ -273,7 +304,7 @@ static void stats_print(struct stats_record *stats_rec,
 	int i;
 
 	/* Header */
-	printf("Running XDP/eBPF prog_num:%d\n", prog_num);
+	printf("Running XDP/eBPF prog_name:%s\n", prog_name);
 	printf("%-15s %-7s %-14s %-11s %-9s\n",
 	       "XDP-cpumap", "CPU:to", "pps", "drop-pps", "extra-info");
 
@@ -424,20 +455,20 @@ static void stats_collect(struct stats_record *rec)
 {
 	int fd, i;
 
-	fd = map_fd[1]; /* map: rx_cnt */
+	fd = rx_cnt_map_fd;
 	map_collect_percpu(fd, 0, &rec->rx_cnt);
 
-	fd = map_fd[2]; /* map: redirect_err_cnt */
+	fd = redirect_err_cnt_map_fd;
 	map_collect_percpu(fd, 1, &rec->redir_err);
 
-	fd = map_fd[3]; /* map: cpumap_enqueue_cnt */
+	fd = cpumap_enqueue_cnt_map_fd;
 	for (i = 0; i < MAX_CPUS; i++)
 		map_collect_percpu(fd, i, &rec->enq[i]);
 
-	fd = map_fd[4]; /* map: cpumap_kthread_cnt */
+	fd = cpumap_kthread_cnt_map_fd;
 	map_collect_percpu(fd, 0, &rec->kthread);
 
-	fd = map_fd[8]; /* map: exception_cnt */
+	fd = exception_cnt_map_fd;
 	map_collect_percpu(fd, 0, &rec->exception);
 }
 
@@ -462,7 +493,7 @@ static int create_cpu_entry(__u32 cpu, __u32 queue_size,
 	/* Add a CPU entry to cpumap, as this allocate a cpu entry in
 	 * the kernel for the cpu.
 	 */
-	ret = bpf_map_update_elem(map_fd[0], &cpu, &queue_size, 0);
+	ret = bpf_map_update_elem(cpu_map_fd, &cpu, &queue_size, 0);
 	if (ret) {
 		fprintf(stderr, "Create CPU entry failed (err:%d)\n", ret);
 		exit(EXIT_FAIL_BPF);
@@ -471,23 +502,22 @@ static int create_cpu_entry(__u32 cpu, __u32 queue_size,
 	/* Inform bpf_prog's that a new CPU is available to select
 	 * from via some control maps.
 	 */
-	/* map_fd[5] = cpus_available */
-	ret = bpf_map_update_elem(map_fd[5], &avail_idx, &cpu, 0);
+	ret = bpf_map_update_elem(cpus_available_map_fd, &avail_idx, &cpu, 0);
 	if (ret) {
 		fprintf(stderr, "Add to avail CPUs failed\n");
 		exit(EXIT_FAIL_BPF);
 	}
 
 	/* When not replacing/updating existing entry, bump the count */
-	/* map_fd[6] = cpus_count */
-	ret = bpf_map_lookup_elem(map_fd[6], &key, &curr_cpus_count);
+	ret = bpf_map_lookup_elem(cpus_count_map_fd, &key, &curr_cpus_count);
 	if (ret) {
 		fprintf(stderr, "Failed reading curr cpus_count\n");
 		exit(EXIT_FAIL_BPF);
 	}
 	if (new) {
 		curr_cpus_count++;
-		ret = bpf_map_update_elem(map_fd[6], &key, &curr_cpus_count, 0);
+		ret = bpf_map_update_elem(cpus_count_map_fd, &key,
+					  &curr_cpus_count, 0);
 		if (ret) {
 			fprintf(stderr, "Failed write curr cpus_count\n");
 			exit(EXIT_FAIL_BPF);
@@ -510,8 +540,8 @@ static void mark_cpus_unavailable(void)
 	int ret, i;
 
 	for (i = 0; i < MAX_CPUS; i++) {
-		/* map_fd[5] = cpus_available */
-		ret = bpf_map_update_elem(map_fd[5], &i, &invalid_cpu, 0);
+		ret = bpf_map_update_elem(cpus_available_map_fd, &i,
+					  &invalid_cpu, 0);
 		if (ret) {
 			fprintf(stderr, "Failed marking CPU unavailable\n");
 			exit(EXIT_FAIL_BPF);
@@ -531,7 +561,7 @@ static void stress_cpumap(void)
 	create_cpu_entry(1, 16000, 0, false);
 }
 
-static void stats_poll(int interval, bool use_separators, int prog_num,
+static void stats_poll(int interval, bool use_separators, char *prog_name,
 		       bool stress_mode)
 {
 	struct stats_record *record, *prev;
@@ -547,7 +577,7 @@ static void stats_poll(int interval, bool use_separators, int prog_num,
 	while (1) {
 		swap(&prev, &record);
 		stats_collect(record);
-		stats_print(record, prev, prog_num);
+		stats_print(record, prev, prog_name);
 		sleep(interval);
 		if (stress_mode)
 			stress_cpumap();
@@ -557,20 +587,55 @@ static void stats_poll(int interval, bool use_separators, int prog_num,
 	free_stats_record(prev);
 }
 
+static int init_map_fds(struct bpf_object *obj)
+{
+	cpu_map_fd = bpf_object__find_map_fd_by_name(obj, "cpu_map");
+	rx_cnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rx_cnt");
+	redirect_err_cnt_map_fd =
+		bpf_object__find_map_fd_by_name(obj, "redirect_err_cnt");
+	cpumap_enqueue_cnt_map_fd =
+		bpf_object__find_map_fd_by_name(obj, "cpumap_enqueue_cnt");
+	cpumap_kthread_cnt_map_fd =
+		bpf_object__find_map_fd_by_name(obj, "cpumap_kthread_cnt");
+	cpus_available_map_fd =
+		bpf_object__find_map_fd_by_name(obj, "cpus_available");
+	cpus_count_map_fd = bpf_object__find_map_fd_by_name(obj, "cpus_count");
+	cpus_iterator_map_fd =
+		bpf_object__find_map_fd_by_name(obj, "cpus_iterator");
+	exception_cnt_map_fd =
+		bpf_object__find_map_fd_by_name(obj, "exception_cnt");
+
+	if (cpu_map_fd < 0 || rx_cnt_map_fd < 0 ||
+	    redirect_err_cnt_map_fd < 0 || cpumap_enqueue_cnt_map_fd < 0 ||
+	    cpumap_kthread_cnt_map_fd < 0 || cpus_available_map_fd < 0 ||
+	    cpus_count_map_fd < 0 || cpus_iterator_map_fd < 0 ||
+	    exception_cnt_map_fd < 0)
+		return -ENOENT;
+
+	return 0;
+}
+
 int main(int argc, char **argv)
 {
 	struct rlimit r = {10 * 1024 * 1024, RLIM_INFINITY};
+	char *prog_name = "xdp_cpu_map5_lb_hash_ip_pairs";
+	struct bpf_prog_load_attr prog_load_attr = {
+		.prog_type	= BPF_PROG_TYPE_UNSPEC,
+	};
+	struct bpf_prog_info info = {};
+	__u32 info_len = sizeof(info);
 	bool use_separators = true;
 	bool stress_mode = false;
+	struct bpf_program *prog;
+	struct bpf_object *obj;
 	char filename[256];
-	bool debug = false;
 	int added_cpus = 0;
 	int longindex = 0;
 	int interval = 2;
-	int prog_num = 5;
 	int add_cpu = -1;
+	int opt, err;
+	int prog_fd;
 	__u32 qsize;
-	int opt;
 
 	/* Notice: choosing he queue size is very important with the
 	 * ixgbe driver, because it's driver page recycling trick is
@@ -581,26 +646,29 @@ int main(int argc, char **argv)
 	qsize = 128+64;
 
 	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+	prog_load_attr.file = filename;
 
 	if (setrlimit(RLIMIT_MEMLOCK, &r)) {
 		perror("setrlimit(RLIMIT_MEMLOCK)");
 		return 1;
 	}
 
-	if (load_bpf_file(filename)) {
-		fprintf(stderr, "ERR in load_bpf_file(): %s", bpf_log_buf);
+	if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
+		return EXIT_FAIL;
+
+	if (prog_fd < 0) {
+		fprintf(stderr, "ERR: bpf_prog_load_xattr: %s\n",
+			strerror(errno));
 		return EXIT_FAIL;
 	}
-
-	if (!prog_fd[0]) {
-		fprintf(stderr, "ERR: load_bpf_file: %s\n", strerror(errno));
+	if (init_map_fds(obj) < 0) {
+		fprintf(stderr, "bpf_object__find_map_fd_by_name failed\n");
 		return EXIT_FAIL;
 	}
-
 	mark_cpus_unavailable();
 
 	/* Parse commands line args */
-	while ((opt = getopt_long(argc, argv, "hSd:",
+	while ((opt = getopt_long(argc, argv, "hSd:s:p:q:c:xzF",
 				  long_options, &longindex)) != -1) {
 		switch (opt) {
 		case 'd':
@@ -624,9 +692,6 @@ int main(int argc, char **argv)
 		case 'S':
 			xdp_flags |= XDP_FLAGS_SKB_MODE;
 			break;
-		case 'D':
-			debug = true;
-			break;
 		case 'x':
 			stress_mode = true;
 			break;
@@ -635,13 +700,7 @@ int main(int argc, char **argv)
 			break;
 		case 'p':
 			/* Selecting eBPF prog to load */
-			prog_num = atoi(optarg);
-			if (prog_num < 0 || prog_num >= MAX_PROG) {
-				fprintf(stderr,
-					"--prognum too large err(%d):%s\n",
-					errno, strerror(errno));
-				goto error;
-			}
+			prog_name = optarg;
 			break;
 		case 'c':
 			/* Add multiple CPUs */
@@ -658,24 +717,27 @@ int main(int argc, char **argv)
 		case 'q':
 			qsize = atoi(optarg);
 			break;
+		case 'F':
+			xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
+			break;
 		case 'h':
 		error:
 		default:
-			usage(argv);
+			usage(argv, obj);
 			return EXIT_FAIL_OPTION;
 		}
 	}
 	/* Required option */
 	if (ifindex == -1) {
 		fprintf(stderr, "ERR: required option --dev missing\n");
-		usage(argv);
+		usage(argv, obj);
 		return EXIT_FAIL_OPTION;
 	}
 	/* Required option */
 	if (add_cpu == -1) {
 		fprintf(stderr, "ERR: required option --cpu missing\n");
 		fprintf(stderr, " Specify multiple --cpu option to add more\n");
-		usage(argv);
+		usage(argv, obj);
 		return EXIT_FAIL_OPTION;
 	}
 
@@ -683,16 +745,30 @@ int main(int argc, char **argv)
 	signal(SIGINT, int_exit);
 	signal(SIGTERM, int_exit);
 
-	if (bpf_set_link_xdp_fd(ifindex, prog_fd[prog_num], xdp_flags) < 0) {
+	prog = bpf_object__find_program_by_title(obj, prog_name);
+	if (!prog) {
+		fprintf(stderr, "bpf_object__find_program_by_title failed\n");
+		return EXIT_FAIL;
+	}
+
+	prog_fd = bpf_program__fd(prog);
+	if (prog_fd < 0) {
+		fprintf(stderr, "bpf_program__fd failed\n");
+		return EXIT_FAIL;
+	}
+
+	if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
 		fprintf(stderr, "link set xdp fd failed\n");
 		return EXIT_FAIL_XDP;
 	}
 
-	if (debug) {
-		printf("Debug-mode reading trace pipe (fix #define DEBUG)\n");
-		read_trace_pipe();
+	err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
+	if (err) {
+		printf("can't get prog info - %s\n", strerror(errno));
+		return err;
 	}
+	prog_id = info.id;
 
-	stats_poll(interval, use_separators, prog_num, stress_mode);
+	stats_poll(interval, use_separators, prog_name, stress_mode);
 	return EXIT_OK;
 }

samples/bpf/xdp_redirect_map_user.c

@@ -22,21 +22,48 @@
 #include <libgen.h>
 #include <sys/resource.h>
 
-#include "bpf_load.h"
 #include "bpf_util.h"
 #include <bpf/bpf.h>
+#include "bpf/libbpf.h"
 
 static int ifindex_in;
 static int ifindex_out;
 static bool ifindex_out_xdp_dummy_attached = true;
+static __u32 prog_id;
+static __u32 dummy_prog_id;
 
-static __u32 xdp_flags;
+static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
+static int rxcnt_map_fd;
 
 static void int_exit(int sig)
 {
-	bpf_set_link_xdp_fd(ifindex_in, -1, xdp_flags);
-	if (ifindex_out_xdp_dummy_attached)
-		bpf_set_link_xdp_fd(ifindex_out, -1, xdp_flags);
+	__u32 curr_prog_id = 0;
+
+	if (bpf_get_link_xdp_id(ifindex_in, &curr_prog_id, xdp_flags)) {
+		printf("bpf_get_link_xdp_id failed\n");
+		exit(1);
+	}
+	if (prog_id == curr_prog_id)
+		bpf_set_link_xdp_fd(ifindex_in, -1, xdp_flags);
+	else if (!curr_prog_id)
+		printf("couldn't find a prog id on iface IN\n");
+	else
+		printf("program on iface IN changed, not removing\n");
+
+	if (ifindex_out_xdp_dummy_attached) {
+		curr_prog_id = 0;
+		if (bpf_get_link_xdp_id(ifindex_out, &curr_prog_id,
+					xdp_flags)) {
+			printf("bpf_get_link_xdp_id failed\n");
+			exit(1);
+		}
+		if (prog_id == curr_prog_id)
+			bpf_set_link_xdp_fd(ifindex_out, -1, xdp_flags);
+		else if (!curr_prog_id)
+			printf("couldn't find a prog id on iface OUT\n");
+		else
+			printf("program on iface OUT changed, not removing\n");
+	}
 	exit(0);
 }
 
@@ -53,7 +80,7 @@ static void poll_stats(int interval, int ifindex)
 		int i;
 
 		sleep(interval);
-		assert(bpf_map_lookup_elem(map_fd[1], &key, values) == 0);
+		assert(bpf_map_lookup_elem(rxcnt_map_fd, &key, values) == 0);
 		for (i = 0; i < nr_cpus; i++)
 			sum += (values[i] - prev[i]);
 		if (sum)
@@ -69,16 +96,26 @@ static void usage(const char *prog)
 		"usage: %s [OPTS] IFINDEX_IN IFINDEX_OUT\n\n"
 		"OPTS:\n"
 		"    -S    use skb-mode\n"
-		"    -N    enforce native mode\n",
+		"    -N    enforce native mode\n"
+		"    -F    force loading prog\n",
 		prog);
 }
 
 int main(int argc, char **argv)
 {
 	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
-	const char *optstr = "SN";
-	char filename[256];
+	struct bpf_prog_load_attr prog_load_attr = {
+		.prog_type	= BPF_PROG_TYPE_XDP,
+	};
+	struct bpf_program *prog, *dummy_prog;
+	struct bpf_prog_info info = {};
+	__u32 info_len = sizeof(info);
+	int prog_fd, dummy_prog_fd;
+	const char *optstr = "FSN";
+	struct bpf_object *obj;
 	int ret, opt, key = 0;
+	char filename[256];
+	int tx_port_map_fd;
 
 	while ((opt = getopt(argc, argv, optstr)) != -1) {
 		switch (opt) {
@@ -88,6 +125,9 @@ int main(int argc, char **argv)
 		case 'N':
 			xdp_flags |= XDP_FLAGS_DRV_MODE;
 			break;
+		case 'F':
+			xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
+			break;
 		default:
 			usage(basename(argv[0]));
 			return 1;
@@ -109,37 +149,65 @@ int main(int argc, char **argv)
 	printf("input: %d output: %d\n", ifindex_in, ifindex_out);
 
 	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+	prog_load_attr.file = filename;
 
-	if (load_bpf_file(filename)) {
-		printf("%s", bpf_log_buf);
+	if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
+		return 1;
+
+	prog = bpf_program__next(NULL, obj);
+	dummy_prog = bpf_program__next(prog, obj);
+	if (!prog || !dummy_prog) {
+		printf("finding a prog in obj file failed\n");
+		return 1;
+	}
+	/* bpf_prog_load_xattr gives us the pointer to first prog's fd,
+	 * so we're missing only the fd for dummy prog
+	 */
+	dummy_prog_fd = bpf_program__fd(dummy_prog);
+	if (prog_fd < 0 || dummy_prog_fd < 0) {
+		printf("bpf_prog_load_xattr: %s\n", strerror(errno));
 		return 1;
 	}
 
-	if (!prog_fd[0]) {
-		printf("load_bpf_file: %s\n", strerror(errno));
+	tx_port_map_fd = bpf_object__find_map_fd_by_name(obj, "tx_port");
+	rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt");
+	if (tx_port_map_fd < 0 || rxcnt_map_fd < 0) {
+		printf("bpf_object__find_map_fd_by_name failed\n");
 		return 1;
 	}
 
-	if (bpf_set_link_xdp_fd(ifindex_in, prog_fd[0], xdp_flags) < 0) {
+	if (bpf_set_link_xdp_fd(ifindex_in, prog_fd, xdp_flags) < 0) {
 		printf("ERROR: link set xdp fd failed on %d\n", ifindex_in);
 		return 1;
 	}
 
+	ret = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
+	if (ret) {
+		printf("can't get prog info - %s\n", strerror(errno));
+		return ret;
+	}
+	prog_id = info.id;
+
 	/* Loading dummy XDP prog on out-device */
-	if (bpf_set_link_xdp_fd(ifindex_out, prog_fd[1],
+	if (bpf_set_link_xdp_fd(ifindex_out, dummy_prog_fd,
 			    (xdp_flags | XDP_FLAGS_UPDATE_IF_NOEXIST)) < 0) {
 		printf("WARN: link set xdp fd failed on %d\n", ifindex_out);
 		ifindex_out_xdp_dummy_attached = false;
 	}
 
+	memset(&info, 0, sizeof(info));
+	ret = bpf_obj_get_info_by_fd(dummy_prog_fd, &info, &info_len);
+	if (ret) {
+		printf("can't get prog info - %s\n", strerror(errno));
+		return ret;
+	}
+	dummy_prog_id = info.id;
+
 	signal(SIGINT, int_exit);
 	signal(SIGTERM, int_exit);
 
-	printf("map[0] (vports) = %i, map[1] (map) = %i, map[2] (count) = %i\n",
-		map_fd[0], map_fd[1], map_fd[2]);
-
 	/* populate virtual to physical port map */
-	ret = bpf_map_update_elem(map_fd[0], &key, &ifindex_out, 0);
+	ret = bpf_map_update_elem(tx_port_map_fd, &key, &ifindex_out, 0);
 	if (ret) {
 		perror("bpf_update_elem");
 		goto out;

samples/bpf/xdp_redirect_user.c

@@ -22,21 +22,48 @@
 #include <libgen.h>
 #include <sys/resource.h>
 
-#include "bpf_load.h"
 #include "bpf_util.h"
 #include <bpf/bpf.h>
+#include "bpf/libbpf.h"
 
 static int ifindex_in;
 static int ifindex_out;
 static bool ifindex_out_xdp_dummy_attached = true;
+static __u32 prog_id;
+static __u32 dummy_prog_id;
 
-static __u32 xdp_flags;
+static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
+static int rxcnt_map_fd;
 
 static void int_exit(int sig)
 {
-	bpf_set_link_xdp_fd(ifindex_in, -1, xdp_flags);
-	if (ifindex_out_xdp_dummy_attached)
-		bpf_set_link_xdp_fd(ifindex_out, -1, xdp_flags);
+	__u32 curr_prog_id = 0;
+
+	if (bpf_get_link_xdp_id(ifindex_in, &curr_prog_id, xdp_flags)) {
+		printf("bpf_get_link_xdp_id failed\n");
+		exit(1);
+	}
+	if (prog_id == curr_prog_id)
+		bpf_set_link_xdp_fd(ifindex_in, -1, xdp_flags);
+	else if (!curr_prog_id)
+		printf("couldn't find a prog id on iface IN\n");
+	else
+		printf("program on iface IN changed, not removing\n");
+
+	if (ifindex_out_xdp_dummy_attached) {
+		curr_prog_id = 0;
+		if (bpf_get_link_xdp_id(ifindex_out, &curr_prog_id,
+					xdp_flags)) {
+			printf("bpf_get_link_xdp_id failed\n");
+			exit(1);
+		}
+		if (prog_id == curr_prog_id)
+			bpf_set_link_xdp_fd(ifindex_out, -1, xdp_flags);
+		else if (!curr_prog_id)
+			printf("couldn't find a prog id on iface OUT\n");
+		else
+			printf("program on iface OUT changed, not removing\n");
+	}
 	exit(0);
 }
 
@@ -53,7 +80,7 @@ static void poll_stats(int interval, int ifindex)
 		int i;
 
 		sleep(interval);
-		assert(bpf_map_lookup_elem(map_fd[1], &key, values) == 0);
+		assert(bpf_map_lookup_elem(rxcnt_map_fd, &key, values) == 0);
 		for (i = 0; i < nr_cpus; i++)
 			sum += (values[i] - prev[i]);
 		if (sum)
@@ -69,7 +96,8 @@ static void usage(const char *prog)
 		"usage: %s [OPTS] IFINDEX_IN IFINDEX_OUT\n\n"
 		"OPTS:\n"
 		"    -S    use skb-mode\n"
-		"    -N    enforce native mode\n",
+		"    -N    enforce native mode\n"
+		"    -F    force loading prog\n",
 		prog);
 }
 
@@ -77,9 +105,18 @@ static void usage(const char *prog)
 int main(int argc, char **argv)
 {
 	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
-	const char *optstr = "SN";
+	struct bpf_prog_load_attr prog_load_attr = {
+		.prog_type	= BPF_PROG_TYPE_XDP,
+	};
+	struct bpf_program *prog, *dummy_prog;
+	int prog_fd, tx_port_map_fd, opt;
+	struct bpf_prog_info info = {};
+	__u32 info_len = sizeof(info);
+	const char *optstr = "FSN";
+	struct bpf_object *obj;
 	char filename[256];
-	int ret, opt, key = 0;
+	int dummy_prog_fd;
+	int ret, key = 0;
 
 	while ((opt = getopt(argc, argv, optstr)) != -1) {
 		switch (opt) {
@@ -89,6 +126,9 @@ int main(int argc, char **argv)
 		case 'N':
 			xdp_flags |= XDP_FLAGS_DRV_MODE;
 			break;
+		case 'F':
+			xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
+			break;
 		default:
 			usage(basename(argv[0]));
 			return 1;
@@ -110,34 +150,65 @@ int main(int argc, char **argv)
 	printf("input: %d output: %d\n", ifindex_in, ifindex_out);
 
 	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+	prog_load_attr.file = filename;
 
-	if (load_bpf_file(filename)) {
-		printf("%s", bpf_log_buf);
+	if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
+		return 1;
+
+	prog = bpf_program__next(NULL, obj);
+	dummy_prog = bpf_program__next(prog, obj);
+	if (!prog || !dummy_prog) {
+		printf("finding a prog in obj file failed\n");
+		return 1;
+	}
+	/* bpf_prog_load_xattr gives us the pointer to first prog's fd,
+	 * so we're missing only the fd for dummy prog
+	 */
+	dummy_prog_fd = bpf_program__fd(dummy_prog);
+	if (prog_fd < 0 || dummy_prog_fd < 0) {
+		printf("bpf_prog_load_xattr: %s\n", strerror(errno));
 		return 1;
 	}
 
-	if (!prog_fd[0]) {
-		printf("load_bpf_file: %s\n", strerror(errno));
+	tx_port_map_fd = bpf_object__find_map_fd_by_name(obj, "tx_port");
+	rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt");
+	if (tx_port_map_fd < 0 || rxcnt_map_fd < 0) {
+		printf("bpf_object__find_map_fd_by_name failed\n");
 		return 1;
 	}
 
-	if (bpf_set_link_xdp_fd(ifindex_in, prog_fd[0], xdp_flags) < 0) {
+	if (bpf_set_link_xdp_fd(ifindex_in, prog_fd, xdp_flags) < 0) {
 		printf("ERROR: link set xdp fd failed on %d\n", ifindex_in);
 		return 1;
 	}
 
+	ret = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
+	if (ret) {
+		printf("can't get prog info - %s\n", strerror(errno));
+		return ret;
+	}
+	prog_id = info.id;
+
 	/* Loading dummy XDP prog on out-device */
-	if (bpf_set_link_xdp_fd(ifindex_out, prog_fd[1],
+	if (bpf_set_link_xdp_fd(ifindex_out, dummy_prog_fd,
 			    (xdp_flags | XDP_FLAGS_UPDATE_IF_NOEXIST)) < 0) {
 		printf("WARN: link set xdp fd failed on %d\n", ifindex_out);
 		ifindex_out_xdp_dummy_attached = false;
 	}
 
+	memset(&info, 0, sizeof(info));
+	ret = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
+	if (ret) {
+		printf("can't get prog info - %s\n", strerror(errno));
+		return ret;
+	}
+	dummy_prog_id = info.id;
+
 	signal(SIGINT, int_exit);
 	signal(SIGTERM, int_exit);
 
 	/* bpf redirect port */
-	ret = bpf_map_update_elem(map_fd[0], &key, &ifindex_out, 0);
+	ret = bpf_map_update_elem(tx_port_map_fd, &key, &ifindex_out, 0);
 	if (ret) {
 		perror("bpf_update_elem");
 		goto out;

samples/bpf/xdp_router_ipv4_user.c

@@ -15,7 +15,6 @@
 #include <string.h>
 #include <sys/socket.h>
 #include <unistd.h>
-#include "bpf_load.h"
 #include <bpf/bpf.h>
 #include <arpa/inet.h>
 #include <fcntl.h>
@@ -25,32 +24,52 @@
 #include <sys/ioctl.h>
 #include <sys/syscall.h>
 #include "bpf_util.h"
+#include "bpf/libbpf.h"
+#include <sys/resource.h>
+#include <libgen.h>
 
-int sock, sock_arp, flags = 0;
+int sock, sock_arp, flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
 static int total_ifindex;
-int *ifindex_list;
+static int *ifindex_list;
+static __u32 *prog_id_list;
 char buf[8192];
+static int lpm_map_fd;
+static int rxcnt_map_fd;
+static int arp_table_map_fd;
+static int exact_match_map_fd;
+static int tx_port_map_fd;
 
 static int get_route_table(int rtm_family);
 static void int_exit(int sig)
 {
+	__u32 prog_id = 0;
 	int i = 0;
 
-	for (i = 0; i < total_ifindex; i++)
-		bpf_set_link_xdp_fd(ifindex_list[i], -1, flags);
+	for (i = 0; i < total_ifindex; i++) {
+		if (bpf_get_link_xdp_id(ifindex_list[i], &prog_id, flags)) {
+			printf("bpf_get_link_xdp_id on iface %d failed\n",
+			       ifindex_list[i]);
+			exit(1);
+		}
+		if (prog_id_list[i] == prog_id)
+			bpf_set_link_xdp_fd(ifindex_list[i], -1, flags);
+		else if (!prog_id)
+			printf("couldn't find a prog id on iface %d\n",
+			       ifindex_list[i]);
+		else
+			printf("program on iface %d changed, not removing\n",
+			       ifindex_list[i]);
+		prog_id = 0;
+	}
 	exit(0);
 }
 
 static void close_and_exit(int sig)
 {
-	int i = 0;
-
 	close(sock);
 	close(sock_arp);
 
-	for (i = 0; i < total_ifindex; i++)
-		bpf_set_link_xdp_fd(ifindex_list[i], -1, flags);
-	exit(0);
+	int_exit(0);
 }
 
 /* Get the mac address of the interface given interface name */
@@ -179,14 +198,10 @@ static void read_route(struct nlmsghdr *nh, int nll)
 		route.iface_name = alloca(sizeof(char *) * IFNAMSIZ);
 		route.iface_name = if_indextoname(route.iface, route.iface_name);
 		route.mac = getmac(route.iface_name);
-		if (route.mac == -1) {
-			int i = 0;
-
-			for (i = 0; i < total_ifindex; i++)
-				bpf_set_link_xdp_fd(ifindex_list[i], -1, flags);
-			exit(0);
-		}
-		assert(bpf_map_update_elem(map_fd[4], &route.iface, &route.iface, 0) == 0);
+		if (route.mac == -1)
+			int_exit(0);
+		assert(bpf_map_update_elem(tx_port_map_fd,
+					   &route.iface, &route.iface, 0) == 0);
 		if (rtm_family == AF_INET) {
 			struct trie_value {
 				__u8 prefix[4];
@@ -207,11 +222,16 @@ static void read_route(struct nlmsghdr *nh, int nll)
 			direct_entry.arp.dst = 0;
 			if (route.dst_len == 32) {
 				if (nh->nlmsg_type == RTM_DELROUTE) {
-					assert(bpf_map_delete_elem(map_fd[3], &route.dst) == 0);
+					assert(bpf_map_delete_elem(exact_match_map_fd,
+								   &route.dst) == 0);
 				} else {
-					if (bpf_map_lookup_elem(map_fd[2], &route.dst, &direct_entry.arp.mac) == 0)
+					if (bpf_map_lookup_elem(arp_table_map_fd,
+								&route.dst,
+								&direct_entry.arp.mac) == 0)
 						direct_entry.arp.dst = route.dst;
-					assert(bpf_map_update_elem(map_fd[3], &route.dst, &direct_entry, 0) == 0);
+					assert(bpf_map_update_elem(exact_match_map_fd,
+								   &route.dst,
+								   &direct_entry, 0) == 0);
 				}
 			}
 			for (i = 0; i < 4; i++)
@@ -225,7 +245,7 @@ static void read_route(struct nlmsghdr *nh, int nll)
 			       route.gw, route.dst_len,
 			       route.metric,
 			       route.iface_name);
-			if (bpf_map_lookup_elem(map_fd[0], prefix_key,
+			if (bpf_map_lookup_elem(lpm_map_fd, prefix_key,
 						prefix_value) < 0) {
 				for (i = 0; i < 4; i++)
 					prefix_value->prefix[i] = prefix_key->data[i];
@@ -234,7 +254,7 @@ static void read_route(struct nlmsghdr *nh, int nll)
 				prefix_value->gw = route.gw;
 				prefix_value->metric = route.metric;
 
-				assert(bpf_map_update_elem(map_fd[0],
+				assert(bpf_map_update_elem(lpm_map_fd,
 							   prefix_key,
 							   prefix_value, 0
 							   ) == 0);
@@ -247,7 +267,7 @@ static void read_route(struct nlmsghdr *nh, int nll)
 					       prefix_key->data[2],
 					       prefix_key->data[3],
 					       prefix_key->prefixlen);
-					assert(bpf_map_delete_elem(map_fd[0],
+					assert(bpf_map_delete_elem(lpm_map_fd,
 								   prefix_key
 								   ) == 0);
 					/* Rereading the route table to check if
@@ -275,8 +295,7 @@ static void read_route(struct nlmsghdr *nh, int nll)
 					prefix_value->ifindex = route.iface;
 					prefix_value->gw = route.gw;
 					prefix_value->metric = route.metric;
-					assert(bpf_map_update_elem(
-								   map_fd[0],
+					assert(bpf_map_update_elem(lpm_map_fd,
 								   prefix_key,
 								   prefix_value,
 								   0) == 0);
@@ -401,7 +420,8 @@ static void read_arp(struct nlmsghdr *nh, int nll)
 		arp_entry.mac = atol(mac);
 		printf("%x\t\t%llx\n", arp_entry.dst, arp_entry.mac);
 		if (ndm_family == AF_INET) {
-			if (bpf_map_lookup_elem(map_fd[3], &arp_entry.dst,
+			if (bpf_map_lookup_elem(exact_match_map_fd,
+						&arp_entry.dst,
 						&direct_entry) == 0) {
 				if (nh->nlmsg_type == RTM_DELNEIGH) {
 					direct_entry.arp.dst = 0;
@@ -410,16 +430,17 @@ static void read_arp(struct nlmsghdr *nh, int nll)
 					direct_entry.arp.dst = arp_entry.dst;
 					direct_entry.arp.mac = arp_entry.mac;
 				}
-				assert(bpf_map_update_elem(map_fd[3],
+				assert(bpf_map_update_elem(exact_match_map_fd,
 							   &arp_entry.dst,
 							   &direct_entry, 0
 							   ) == 0);
 				memset(&direct_entry, 0, sizeof(direct_entry));
 			}
 			if (nh->nlmsg_type == RTM_DELNEIGH) {
-				assert(bpf_map_delete_elem(map_fd[2], &arp_entry.dst) == 0);
+				assert(bpf_map_delete_elem(arp_table_map_fd,
+							   &arp_entry.dst) == 0);
 			} else if (nh->nlmsg_type == RTM_NEWNEIGH) {
-				assert(bpf_map_update_elem(map_fd[2],
+				assert(bpf_map_update_elem(arp_table_map_fd,
 							   &arp_entry.dst,
 							   &arp_entry.mac, 0
 							   ) == 0);
@@ -553,7 +574,8 @@ static int monitor_route(void)
 		for (key = 0; key < nr_keys; key++) {
 			__u64 sum = 0;
 
-			assert(bpf_map_lookup_elem(map_fd[1], &key, values) == 0);
+			assert(bpf_map_lookup_elem(rxcnt_map_fd,
+						   &key, values) == 0);
 			for (i = 0; i < nr_cpus; i++)
 				sum += (values[i] - prev[key][i]);
 			if (sum)
@@ -594,36 +616,87 @@ static int monitor_route(void)
 	return ret;
 }
 
+static void usage(const char *prog)
+{
+	fprintf(stderr,
+		"%s: %s [OPTS] interface name list\n\n"
+		"OPTS:\n"
+		"    -S    use skb-mode\n"
+		"    -F    force loading prog\n",
+		__func__, prog);
+}
+
 int main(int ac, char **argv)
 {
+	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
+	struct bpf_prog_load_attr prog_load_attr = {
+		.prog_type	= BPF_PROG_TYPE_XDP,
+	};
+	struct bpf_prog_info info = {};
+	__u32 info_len = sizeof(info);
+	const char *optstr = "SF";
+	struct bpf_object *obj;
 	char filename[256];
 	char **ifname_list;
-	int i = 1;
+	int prog_fd, opt;
+	int err, i = 1;
 
 	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
-	if (ac < 2) {
-		printf("usage: %s [-S] Interface name list\n", argv[0]);
+	prog_load_attr.file = filename;
+
+	total_ifindex = ac - 1;
+	ifname_list = (argv + 1);
+
+	while ((opt = getopt(ac, argv, optstr)) != -1) {
+		switch (opt) {
+		case 'S':
+			flags |= XDP_FLAGS_SKB_MODE;
+			total_ifindex--;
+			ifname_list++;
+			break;
+		case 'F':
+			flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
+			total_ifindex--;
+			ifname_list++;
+			break;
+		default:
+			usage(basename(argv[0]));
+			return 1;
+		}
+	}
+
+	if (optind == ac) {
+		usage(basename(argv[0]));
 		return 1;
 	}
-	if (!strcmp(argv[1], "-S")) {
-		flags = XDP_FLAGS_SKB_MODE;
-		total_ifindex = ac - 2;
-		ifname_list = (argv + 2);
-	} else {
-		flags = 0;
-		total_ifindex = ac - 1;
-		ifname_list = (argv + 1);
-	}
-	if (load_bpf_file(filename)) {
-		printf("%s", bpf_log_buf);
+
+	if (setrlimit(RLIMIT_MEMLOCK, &r)) {
+		perror("setrlimit(RLIMIT_MEMLOCK)");
 		return 1;
 	}
+
+	if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
+		return 1;
+
 	printf("\n**************loading bpf file*********************\n\n\n");
-	if (!prog_fd[0]) {
-		printf("load_bpf_file: %s\n", strerror(errno));
+	if (!prog_fd) {
+		printf("bpf_prog_load_xattr: %s\n", strerror(errno));
 		return 1;
 	}
-	ifindex_list = (int *)malloc(total_ifindex * sizeof(int *));
+
+	lpm_map_fd = bpf_object__find_map_fd_by_name(obj, "lpm_map");
+	rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt");
+	arp_table_map_fd = bpf_object__find_map_fd_by_name(obj, "arp_table");
+	exact_match_map_fd = bpf_object__find_map_fd_by_name(obj,
+							     "exact_match");
+	tx_port_map_fd = bpf_object__find_map_fd_by_name(obj, "tx_port");
+	if (lpm_map_fd < 0 || rxcnt_map_fd < 0 || arp_table_map_fd < 0 ||
+	    exact_match_map_fd < 0 || tx_port_map_fd < 0) {
+		printf("bpf_object__find_map_fd_by_name failed\n");
+		return 1;
+	}
+
+	ifindex_list = (int *)calloc(total_ifindex, sizeof(int *));
 	for (i = 0; i < total_ifindex; i++) {
 		ifindex_list[i] = if_nametoindex(ifname_list[i]);
 		if (!ifindex_list[i]) {
@@ -632,8 +705,9 @@ int main(int ac, char **argv)
 			return 1;
 		}
 	}
+	prog_id_list = (__u32 *)calloc(total_ifindex, sizeof(__u32 *));
 	for (i = 0; i < total_ifindex; i++) {
-		if (bpf_set_link_xdp_fd(ifindex_list[i], prog_fd[0], flags) < 0) {
+		if (bpf_set_link_xdp_fd(ifindex_list[i], prog_fd, flags) < 0) {
 			printf("link set xdp fd failed\n");
 			int recovery_index = i;
 
@@ -642,6 +716,13 @@ int main(int ac, char **argv)
 
 			return 1;
 		}
+		err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
+		if (err) {
+			printf("can't get prog info - %s\n", strerror(errno));
+			return err;
+		}
+		prog_id_list[i] = info.id;
+		memset(&info, 0, sizeof(info));
 		printf("Attached to %d\n", ifindex_list[i]);
 	}
 	signal(SIGINT, int_exit);

samples/bpf/xdp_rxq_info_user.c

@@ -29,8 +29,9 @@ static const char *__doc__ = " XDP RX-queue info extract example\n\n"
 static int ifindex = -1;
 static char ifname_buf[IF_NAMESIZE];
 static char *ifname;
+static __u32 prog_id;
 
-static __u32 xdp_flags;
+static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
 
 static struct bpf_map *stats_global_map;
 static struct bpf_map *rx_queue_index_map;
@@ -52,16 +53,30 @@ static const struct option long_options[] = {
 	{"action",	required_argument,	NULL, 'a' },
 	{"readmem", 	no_argument,		NULL, 'r' },
 	{"swapmac", 	no_argument,		NULL, 'm' },
+	{"force",	no_argument,		NULL, 'F' },
 	{0, 0, NULL,  0 }
 };
 
 static void int_exit(int sig)
 {
-	fprintf(stderr,
-		"Interrupted: Removing XDP program on ifindex:%d device:%s\n",
-		ifindex, ifname);
-	if (ifindex > -1)
-		bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
+	__u32 curr_prog_id = 0;
+
+	if (ifindex > -1) {
+		if (bpf_get_link_xdp_id(ifindex, &curr_prog_id, xdp_flags)) {
+			printf("bpf_get_link_xdp_id failed\n");
+			exit(EXIT_FAIL);
+		}
+		if (prog_id == curr_prog_id) {
+			fprintf(stderr,
+				"Interrupted: Removing XDP program on ifindex:%d device:%s\n",
+				ifindex, ifname);
+			bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
+		} else if (!curr_prog_id) {
+			printf("couldn't find a prog id on a given iface\n");
+		} else {
+			printf("program on interface changed, not removing\n");
+		}
+	}
 	exit(EXIT_OK);
 }
 
@@ -446,6 +461,8 @@ int main(int argc, char **argv)
 	struct bpf_prog_load_attr prog_load_attr = {
 		.prog_type	= BPF_PROG_TYPE_XDP,
 	};
+	struct bpf_prog_info info = {};
+	__u32 info_len = sizeof(info);
 	int prog_fd, map_fd, opt, err;
 	bool use_separators = true;
 	struct config cfg = { 0 };
@@ -487,7 +504,7 @@ int main(int argc, char **argv)
 	}
 
 	/* Parse commands line args */
-	while ((opt = getopt_long(argc, argv, "hSd:",
+	while ((opt = getopt_long(argc, argv, "FhSrmzd:s:a:",
 				  long_options, &longindex)) != -1) {
 		switch (opt) {
 		case 'd':
@@ -524,6 +541,9 @@ int main(int argc, char **argv)
 		case 'm':
 			cfg_options |= SWAP_MAC;
 			break;
+		case 'F':
+			xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
+			break;
 		case 'h':
 		error:
 		default:
@@ -576,6 +596,13 @@ int main(int argc, char **argv)
 		return EXIT_FAIL_XDP;
 	}
 
+	err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
+	if (err) {
+		printf("can't get prog info - %s\n", strerror(errno));
+		return err;
+	}
+	prog_id = info.id;
+
 	stats_poll(interval, action, cfg_options);
 	return EXIT_OK;
 }

samples/bpf/xdp_sample_pkts_user.c

@@ -12,6 +12,9 @@
 #include <signal.h>
 #include <libbpf.h>
 #include <bpf/bpf.h>
+#include <sys/resource.h>
+#include <libgen.h>
+#include <linux/if_link.h>
 
 #include "perf-sys.h"
 #include "trace_helpers.h"
@@ -20,25 +23,50 @@
 static int pmu_fds[MAX_CPUS], if_idx;
 static struct perf_event_mmap_page *headers[MAX_CPUS];
 static char *if_name;
+static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
+static __u32 prog_id;
 
 static int do_attach(int idx, int fd, const char *name)
 {
+	struct bpf_prog_info info = {};
+	__u32 info_len = sizeof(info);
 	int err;
 
-	err = bpf_set_link_xdp_fd(idx, fd, 0);
-	if (err < 0)
+	err = bpf_set_link_xdp_fd(idx, fd, xdp_flags);
+	if (err < 0) {
 		printf("ERROR: failed to attach program to %s\n", name);
+		return err;
+	}
+
+	err = bpf_obj_get_info_by_fd(fd, &info, &info_len);
+	if (err) {
+		printf("can't get prog info - %s\n", strerror(errno));
+		return err;
+	}
+	prog_id = info.id;
 
 	return err;
 }
 
 static int do_detach(int idx, const char *name)
 {
-	int err;
+	__u32 curr_prog_id = 0;
+	int err = 0;
 
-	err = bpf_set_link_xdp_fd(idx, -1, 0);
-	if (err < 0)
-		printf("ERROR: failed to detach program from %s\n", name);
+	err = bpf_get_link_xdp_id(idx, &curr_prog_id, 0);
+	if (err) {
+		printf("bpf_get_link_xdp_id failed\n");
+		return err;
+	}
+	if (prog_id == curr_prog_id) {
+		err = bpf_set_link_xdp_fd(idx, -1, 0);
+		if (err < 0)
+			printf("ERROR: failed to detach prog from %s\n", name);
+	} else if (!curr_prog_id) {
+		printf("couldn't find a prog id on a %s\n", name);
+	} else {
+		printf("program on interface changed, not removing\n");
+	}
 
 	return err;
 }
@@ -97,20 +125,47 @@ static void sig_handler(int signo)
 	exit(0);
 }
 
+static void usage(const char *prog)
+{
+	fprintf(stderr,
+		"%s: %s [OPTS] <ifname|ifindex>\n\n"
+		"OPTS:\n"
+		"    -F    force loading prog\n",
+		__func__, prog);
+}
+
 int main(int argc, char **argv)
 {
+	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
 	struct bpf_prog_load_attr prog_load_attr = {
 		.prog_type	= BPF_PROG_TYPE_XDP,
 	};
+	const char *optstr = "F";
+	int prog_fd, map_fd, opt;
 	struct bpf_object *obj;
 	struct bpf_map *map;
-	int prog_fd, map_fd;
 	char filename[256];
 	int ret, err, i;
 	int numcpus;
 
-	if (argc < 2) {
-		printf("Usage: %s <ifname>\n", argv[0]);
+	while ((opt = getopt(argc, argv, optstr)) != -1) {
+		switch (opt) {
+		case 'F':
+			xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
+			break;
+		default:
+			usage(basename(argv[0]));
+			return 1;
+		}
+	}
+
+	if (optind == argc) {
+		usage(basename(argv[0]));
+		return 1;
+	}
+
+	if (setrlimit(RLIMIT_MEMLOCK, &r)) {
+		perror("setrlimit(RLIMIT_MEMLOCK)");
 		return 1;
 	}
 
@@ -136,16 +191,16 @@ int main(int argc, char **argv)
 	}
 	map_fd = bpf_map__fd(map);
 
-	if_idx = if_nametoindex(argv[1]);
+	if_idx = if_nametoindex(argv[optind]);
 	if (!if_idx)
-		if_idx = strtoul(argv[1], NULL, 0);
+		if_idx = strtoul(argv[optind], NULL, 0);
 
 	if (!if_idx) {
 		fprintf(stderr, "Invalid ifname\n");
 		return 1;
 	}
-	if_name = argv[1];
-	err = do_attach(if_idx, prog_fd, argv[1]);
+	if_name = argv[optind];
+	err = do_attach(if_idx, prog_fd, if_name);
 	if (err)
 		return err;
 

samples/bpf/xdp_tx_iptunnel_user.c

@@ -17,7 +17,7 @@
 #include <netinet/ether.h>
 #include <unistd.h>
 #include <time.h>
-#include "bpf_load.h"
+#include "bpf/libbpf.h"
 #include <bpf/bpf.h>
 #include "bpf_util.h"
 #include "xdp_tx_iptunnel_common.h"
@@ -25,12 +25,26 @@
 #define STATS_INTERVAL_S 2U
 
 static int ifindex = -1;
-static __u32 xdp_flags = 0;
+static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
+static int rxcnt_map_fd;
+static __u32 prog_id;
 
 static void int_exit(int sig)
 {
-	if (ifindex > -1)
-		bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
+	__u32 curr_prog_id = 0;
+
+	if (ifindex > -1) {
+		if (bpf_get_link_xdp_id(ifindex, &curr_prog_id, xdp_flags)) {
+			printf("bpf_get_link_xdp_id failed\n");
+			exit(1);
+		}
+		if (prog_id == curr_prog_id)
+			bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
+		else if (!curr_prog_id)
+			printf("couldn't find a prog id on a given iface\n");
+		else
+			printf("program on interface changed, not removing\n");
+	}
 	exit(0);
 }
 
@@ -53,7 +67,8 @@ static void poll_stats(unsigned int kill_after_s)
 		for (proto = 0; proto < nr_protos; proto++) {
 			__u64 sum = 0;
 
-			assert(bpf_map_lookup_elem(map_fd[0], &proto, values) == 0);
+			assert(bpf_map_lookup_elem(rxcnt_map_fd, &proto,
+						   values) == 0);
 			for (i = 0; i < nr_cpus; i++)
 				sum += (values[i] - prev[proto][i]);
 
@@ -81,6 +96,7 @@ static void usage(const char *cmd)
 	printf("    -P <IP-Protocol> Default is TCP\n");
 	printf("    -S use skb-mode\n");
 	printf("    -N enforce native mode\n");
+	printf("    -F Force loading the XDP prog\n");
 	printf("    -h Display this help\n");
 }
 
@@ -138,16 +154,22 @@ static int parse_ports(const char *port_str, int *min_port, int *max_port)
 
 int main(int argc, char **argv)
 {
-	unsigned char opt_flags[256] = {};
-	unsigned int kill_after_s = 0;
-	const char *optstr = "i:a:p:s:d:m:T:P:SNh";
-	int min_port = 0, max_port = 0;
-	struct iptnl_info tnl = {};
+	struct bpf_prog_load_attr prog_load_attr = {
+		.prog_type	= BPF_PROG_TYPE_XDP,
+	};
 	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
+	int min_port = 0, max_port = 0, vip2tnl_map_fd;
+	const char *optstr = "i:a:p:s:d:m:T:P:FSNh";
+	unsigned char opt_flags[256] = {};
+	struct bpf_prog_info info = {};
+	__u32 info_len = sizeof(info);
+	unsigned int kill_after_s = 0;
+	struct iptnl_info tnl = {};
+	struct bpf_object *obj;
 	struct vip vip = {};
 	char filename[256];
-	int opt;
-	int i;
+	int opt, prog_fd;
+	int i, err;
 
 	tnl.family = AF_UNSPEC;
 	vip.protocol = IPPROTO_TCP;
@@ -211,6 +233,9 @@ int main(int argc, char **argv)
 		case 'N':
 			xdp_flags |= XDP_FLAGS_DRV_MODE;
 			break;
+		case 'F':
+			xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
+			break;
 		default:
 			usage(argv[0]);
 			return 1;
@@ -232,14 +257,20 @@ int main(int argc, char **argv)
 	}
 
 	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+	prog_load_attr.file = filename;
 
-	if (load_bpf_file(filename)) {
-		printf("%s", bpf_log_buf);
+	if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
+		return 1;
+
+	if (!prog_fd) {
+		printf("load_bpf_file: %s\n", strerror(errno));
 		return 1;
 	}
 
-	if (!prog_fd[0]) {
-		printf("load_bpf_file: %s\n", strerror(errno));
+	rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt");
+	vip2tnl_map_fd = bpf_object__find_map_fd_by_name(obj, "vip2tnl");
+	if (vip2tnl_map_fd < 0 || rxcnt_map_fd < 0) {
+		printf("bpf_object__find_map_fd_by_name failed\n");
 		return 1;
 	}
 
@@ -248,17 +279,25 @@ int main(int argc, char **argv)
 
 	while (min_port <= max_port) {
 		vip.dport = htons(min_port++);
-		if (bpf_map_update_elem(map_fd[1], &vip, &tnl, BPF_NOEXIST)) {
+		if (bpf_map_update_elem(vip2tnl_map_fd, &vip, &tnl,
+					BPF_NOEXIST)) {
 			perror("bpf_map_update_elem(&vip2tnl)");
 			return 1;
 		}
 	}
 
-	if (bpf_set_link_xdp_fd(ifindex, prog_fd[0], xdp_flags) < 0) {
+	if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
 		printf("link set xdp fd failed\n");
 		return 1;
 	}
 
+	err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
+	if (err) {
+		printf("can't get prog info - %s\n", strerror(errno));
+		return err;
+	}
+	prog_id = info.id;
+
 	poll_stats(kill_after_s);
 
 	bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);

samples/bpf/xdpsock_user.c

@@ -68,7 +68,7 @@ enum benchmark_type {
 };
 
 static enum benchmark_type opt_bench = BENCH_RXDROP;
-static u32 opt_xdp_flags;
+static u32 opt_xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
 static const char *opt_if = "";
 static int opt_ifindex;
 static int opt_queue;
@@ -76,6 +76,7 @@ static int opt_poll;
 static int opt_shared_packet_buffer;
 static int opt_interval = 1;
 static u32 opt_xdp_bind_flags;
+static __u32 prog_id;
 
 struct xdp_umem_uqueue {
 	u32 cached_prod;
@@ -631,9 +632,20 @@ static void *poller(void *arg)
 
 static void int_exit(int sig)
 {
+	__u32 curr_prog_id = 0;
+
 	(void)sig;
 	dump_stats();
-	bpf_set_link_xdp_fd(opt_ifindex, -1, opt_xdp_flags);
+	if (bpf_get_link_xdp_id(opt_ifindex, &curr_prog_id, opt_xdp_flags)) {
+		printf("bpf_get_link_xdp_id failed\n");
+		exit(EXIT_FAILURE);
+	}
+	if (prog_id == curr_prog_id)
+		bpf_set_link_xdp_fd(opt_ifindex, -1, opt_xdp_flags);
+	else if (!curr_prog_id)
+		printf("couldn't find a prog id on a given interface\n");
+	else
+		printf("program on interface changed, not removing\n");
 	exit(EXIT_SUCCESS);
 }
 
@@ -682,7 +694,7 @@ static void parse_command_line(int argc, char **argv)
 	opterr = 0;
 
 	for (;;) {
-		c = getopt_long(argc, argv, "rtli:q:psSNn:cz", long_options,
+		c = getopt_long(argc, argv, "Frtli:q:psSNn:cz", long_options,
 				&option_index);
 		if (c == -1)
 			break;
@@ -725,6 +737,9 @@ static void parse_command_line(int argc, char **argv)
 		case 'c':
 			opt_xdp_bind_flags |= XDP_COPY;
 			break;
+		case 'F':
+			opt_xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
+			break;
 		default:
 			usage(basename(argv[0]));
 		}
@@ -904,6 +919,8 @@ int main(int argc, char **argv)
 		.prog_type	= BPF_PROG_TYPE_XDP,
 	};
 	int prog_fd, qidconf_map, xsks_map;
+	struct bpf_prog_info info = {};
+	__u32 info_len = sizeof(info);
 	struct bpf_object *obj;
 	char xdp_filename[256];
 	struct bpf_map *map;
@@ -950,6 +967,13 @@ int main(int argc, char **argv)
 		exit(EXIT_FAILURE);
 	}
 
+	ret = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
+	if (ret) {
+		printf("can't get prog info - %s\n", strerror(errno));
+		return 1;
+	}
+	prog_id = info.id;
+
 	ret = bpf_map_update_elem(qidconf_map, &key, &opt_queue, 0);
 	if (ret) {
 		fprintf(stderr, "ERROR: bpf_map_update_elem qidconf\n");

tools/include/uapi/linux/bpf.h

@@ -267,6 +267,7 @@ enum bpf_attach_type {
 #define BPF_ANY		0 /* create new element or update existing */
 #define BPF_NOEXIST	1 /* create new element if it didn't exist */
 #define BPF_EXIST	2 /* update existing element */
+#define BPF_F_LOCK	4 /* spin_lock-ed map_lookup/map_update */
 
 /* flags for BPF_MAP_CREATE command */
 #define BPF_F_NO_PREALLOC	(1U << 0)
@@ -2422,7 +2423,9 @@ union bpf_attr {
 	FN(map_peek_elem),		\
 	FN(msg_push_data),		\
 	FN(msg_pop_data),		\
-	FN(rc_pointer_rel),
+	FN(rc_pointer_rel),		\
+	FN(spin_lock),			\
+	FN(spin_unlock),
 
 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
  * function eBPF program intends to call
@@ -3056,4 +3059,7 @@ struct bpf_line_info {
 	__u32	line_col;
 };
 
+struct bpf_spin_lock {
+	__u32	val;
+};
 #endif /* _UAPI__LINUX_BPF_H__ */

tools/lib/bpf/bpf.c

@@ -368,6 +368,19 @@ int bpf_map_lookup_elem(int fd, const void *key, void *value)
 	return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
 }
 
+int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags)
+{
+	union bpf_attr attr;
+
+	bzero(&attr, sizeof(attr));
+	attr.map_fd = fd;
+	attr.key = ptr_to_u64(key);
+	attr.value = ptr_to_u64(value);
+	attr.flags = flags;
+
+	return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
+}
+
 int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value)
 {
 	union bpf_attr attr;

tools/lib/bpf/bpf.h

@@ -110,6 +110,8 @@ LIBBPF_API int bpf_map_update_elem(int fd, const void *key, const void *value,
 				   __u64 flags);
 
 LIBBPF_API int bpf_map_lookup_elem(int fd, const void *key, void *value);
+LIBBPF_API int bpf_map_lookup_elem_flags(int fd, const void *key, void *value,
+					 __u64 flags);
 LIBBPF_API int bpf_map_lookup_and_delete_elem(int fd, const void *key,
 					      void *value);
 LIBBPF_API int bpf_map_delete_elem(int fd, const void *key);

tools/lib/bpf/libbpf.c

@@ -2884,6 +2884,12 @@ bpf_object__find_map_by_name(struct bpf_object *obj, const char *name)
 	return NULL;
 }
 
+int
+bpf_object__find_map_fd_by_name(struct bpf_object *obj, const char *name)
+{
+	return bpf_map__fd(bpf_object__find_map_by_name(obj, name));
+}
+
 struct bpf_map *
 bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset)
 {

tools/lib/bpf/libbpf.h

@@ -264,6 +264,9 @@ struct bpf_map;
 LIBBPF_API struct bpf_map *
 bpf_object__find_map_by_name(struct bpf_object *obj, const char *name);
 
+LIBBPF_API int
+bpf_object__find_map_fd_by_name(struct bpf_object *obj, const char *name);
+
 /*
  * Get bpf_map through the offset of corresponding struct bpf_map_def
  * in the BPF object file.
@@ -314,6 +317,7 @@ LIBBPF_API int bpf_prog_load(const char *file, enum bpf_prog_type type,
 			     struct bpf_object **pobj, int *prog_fd);
 
 LIBBPF_API int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags);
+LIBBPF_API int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags);
 
 enum bpf_perf_event_ret {
 	LIBBPF_PERF_EVENT_DONE	= 0,

tools/lib/bpf/libbpf.map

@@ -130,4 +130,7 @@ LIBBPF_0.0.2 {
 		bpf_probe_helper;
 		bpf_probe_map_type;
 		bpf_probe_prog_type;
+		bpf_map_lookup_elem_flags;
+		bpf_object__find_map_fd_by_name;
+		bpf_get_link_xdp_id;
 } LIBBPF_0.0.1;

tools/lib/bpf/netlink.c

@@ -21,6 +21,12 @@
 typedef int (*__dump_nlmsg_t)(struct nlmsghdr *nlmsg, libbpf_dump_nlmsg_t,
 			      void *cookie);
 
+struct xdp_id_md {
+	int ifindex;
+	__u32 flags;
+	__u32 id;
+};
+
 int libbpf_netlink_open(__u32 *nl_pid)
 {
 	struct sockaddr_nl sa;
@@ -196,6 +202,85 @@ static int __dump_link_nlmsg(struct nlmsghdr *nlh,
 	return dump_link_nlmsg(cookie, ifi, tb);
 }
 
+static unsigned char get_xdp_id_attr(unsigned char mode, __u32 flags)
+{
+	if (mode != XDP_ATTACHED_MULTI)
+		return IFLA_XDP_PROG_ID;
+	if (flags & XDP_FLAGS_DRV_MODE)
+		return IFLA_XDP_DRV_PROG_ID;
+	if (flags & XDP_FLAGS_HW_MODE)
+		return IFLA_XDP_HW_PROG_ID;
+	if (flags & XDP_FLAGS_SKB_MODE)
+		return IFLA_XDP_SKB_PROG_ID;
+
+	return IFLA_XDP_UNSPEC;
+}
+
+static int get_xdp_id(void *cookie, void *msg, struct nlattr **tb)
+{
+	struct nlattr *xdp_tb[IFLA_XDP_MAX + 1];
+	struct xdp_id_md *xdp_id = cookie;
+	struct ifinfomsg *ifinfo = msg;
+	unsigned char mode, xdp_attr;
+	int ret;
+
+	if (xdp_id->ifindex && xdp_id->ifindex != ifinfo->ifi_index)
+		return 0;
+
+	if (!tb[IFLA_XDP])
+		return 0;
+
+	ret = libbpf_nla_parse_nested(xdp_tb, IFLA_XDP_MAX, tb[IFLA_XDP], NULL);
+	if (ret)
+		return ret;
+
+	if (!xdp_tb[IFLA_XDP_ATTACHED])
+		return 0;
+
+	mode = libbpf_nla_getattr_u8(xdp_tb[IFLA_XDP_ATTACHED]);
+	if (mode == XDP_ATTACHED_NONE)
+		return 0;
+
+	xdp_attr = get_xdp_id_attr(mode, xdp_id->flags);
+	if (!xdp_attr || !xdp_tb[xdp_attr])
+		return 0;
+
+	xdp_id->id = libbpf_nla_getattr_u32(xdp_tb[xdp_attr]);
+
+	return 0;
+}
+
+int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags)
+{
+	struct xdp_id_md xdp_id = {};
+	int sock, ret;
+	__u32 nl_pid;
+	__u32 mask;
+
+	if (flags & ~XDP_FLAGS_MASK)
+		return -EINVAL;
+
+	/* Check whether the single {HW,DRV,SKB} mode is set */
+	flags &= (XDP_FLAGS_SKB_MODE | XDP_FLAGS_DRV_MODE | XDP_FLAGS_HW_MODE);
+	mask = flags - 1;
+	if (flags && flags & mask)
+		return -EINVAL;
+
+	sock = libbpf_netlink_open(&nl_pid);
+	if (sock < 0)
+		return sock;
+
+	xdp_id.ifindex = ifindex;
+	xdp_id.flags = flags;
+
+	ret = libbpf_nl_get_link(sock, nl_pid, get_xdp_id, &xdp_id);
+	if (!ret)
+		*prog_id = xdp_id.id;
+
+	close(sock);
+	return ret;
+}
+
 int libbpf_nl_get_link(int sock, unsigned int nl_pid,
 		       libbpf_dump_nlmsg_t dump_link_nlmsg, void *cookie)
 {

tools/testing/selftests/bpf/Makefile

@@ -35,7 +35,7 @@ BPF_OBJ_FILES = \
 	sendmsg4_prog.o sendmsg6_prog.o test_lirc_mode2_kern.o \
 	get_cgroup_id_kern.o socket_cookie_prog.o test_select_reuseport_kern.o \
 	test_skb_cgroup_id_kern.o bpf_flow.o netcnt_prog.o test_xdp_vlan.o \
-	xdp_dummy.o test_map_in_map.o
+	xdp_dummy.o test_map_in_map.o test_spin_lock.o test_map_lock.o
 
 # Objects are built with default compilation flags and with sub-register
 # code-gen enabled.
@@ -216,7 +216,8 @@ ifeq ($(DWARF2BTF),y)
 	$(BTF_PAHOLE) -J $@
 endif
 
-$(OUTPUT)/test_verifier: $(OUTPUT)/verifier/tests.h
+VERIFIER_TESTS_H := $(OUTPUT)/verifier/tests.h
+$(OUTPUT)/test_verifier: $(VERIFIER_TESTS_H)
 $(OUTPUT)/test_verifier: CFLAGS += -I$(OUTPUT)
 
 VERIFIER_TEST_FILES := $(wildcard verifier/*.c)
@@ -227,6 +228,7 @@ $(OUTPUT)/verifier/tests.h: $(VERIFIER_TEST_FILES)
 		  ls *.c 2> /dev/null | \
 			sed -e 's@\(.*\)@#include \"\1\"@'; \
 		  echo '#endif' \
-		 ) > $(OUTPUT)/verifier/tests.h)
+		 ) > $(VERIFIER_TESTS_H))
 
-EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(ALU32_BUILD_DIR)
+EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(ALU32_BUILD_DIR) \
+	$(VERIFIER_TESTS_H)

tools/testing/selftests/bpf/bpf_helpers.h

@@ -172,6 +172,10 @@ static int (*bpf_skb_vlan_pop)(void *ctx) =
 	(void *) BPF_FUNC_skb_vlan_pop;
 static int (*bpf_rc_pointer_rel)(void *ctx, int rel_x, int rel_y) =
 	(void *) BPF_FUNC_rc_pointer_rel;
+static void (*bpf_spin_lock)(struct bpf_spin_lock *lock) =
+	(void *) BPF_FUNC_spin_lock;
+static void (*bpf_spin_unlock)(struct bpf_spin_lock *lock) =
+	(void *) BPF_FUNC_spin_unlock;
 
 /* llvm builtin functions that eBPF C program may use to
  * emit BPF_LD_ABS and BPF_LD_IND instructions

tools/testing/selftests/bpf/test_map_lock.c

@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2019 Facebook
+#include <linux/bpf.h>
+#include <linux/version.h>
+#include "bpf_helpers.h"
+
+#define VAR_NUM 16
+
+struct hmap_elem {
+	struct bpf_spin_lock lock;
+	int var[VAR_NUM];
+};
+
+struct bpf_map_def SEC("maps") hash_map = {
+	.type = BPF_MAP_TYPE_HASH,
+	.key_size = sizeof(int),
+	.value_size = sizeof(struct hmap_elem),
+	.max_entries = 1,
+};
+
+BPF_ANNOTATE_KV_PAIR(hash_map, int, struct hmap_elem);
+
+struct array_elem {
+	struct bpf_spin_lock lock;
+	int var[VAR_NUM];
+};
+
+struct bpf_map_def SEC("maps") array_map = {
+	.type = BPF_MAP_TYPE_ARRAY,
+	.key_size = sizeof(int),
+	.value_size = sizeof(struct array_elem),
+	.max_entries = 1,
+};
+
+BPF_ANNOTATE_KV_PAIR(array_map, int, struct array_elem);
+
+SEC("map_lock_demo")
+int bpf_map_lock_test(struct __sk_buff *skb)
+{
+	struct hmap_elem zero = {}, *val;
+	int rnd = bpf_get_prandom_u32();
+	int key = 0, err = 1, i;
+	struct array_elem *q;
+
+	val = bpf_map_lookup_elem(&hash_map, &key);
+	if (!val)
+		goto err;
+	/* spin_lock in hash map */
+	bpf_spin_lock(&val->lock);
+	for (i = 0; i < VAR_NUM; i++)
+		val->var[i] = rnd;
+	bpf_spin_unlock(&val->lock);
+
+	/* spin_lock in array */
+	q = bpf_map_lookup_elem(&array_map, &key);
+	if (!q)
+		goto err;
+	bpf_spin_lock(&q->lock);
+	for (i = 0; i < VAR_NUM; i++)
+		q->var[i] = rnd;
+	bpf_spin_unlock(&q->lock);
+	err = 0;
+err:
+	return err;
+}
+char _license[] SEC("license") = "GPL";

tools/testing/selftests/bpf/test_maps.c

@@ -32,6 +32,8 @@
 #define ENOTSUPP 524
 #endif
 
+static int skips;
+
 static int map_flags;
 
 #define CHECK(condition, tag, format...) ({				\
@@ -724,6 +726,15 @@ static void test_sockmap(int tasks, void *data)
 			    sizeof(key), sizeof(value),
 			    6, 0);
 	if (fd < 0) {
+		if (!bpf_probe_map_type(BPF_MAP_TYPE_SOCKMAP, 0)) {
+			printf("%s SKIP (unsupported map type BPF_MAP_TYPE_SOCKMAP)\n",
+			       __func__);
+			skips++;
+			for (i = 0; i < 6; i++)
+				close(sfd[i]);
+			return;
+		}
+
 		printf("Failed to create sockmap %i\n", fd);
 		goto out_sockmap;
 	}
@@ -1701,6 +1712,6 @@ int main(void)
 	map_flags = BPF_F_NO_PREALLOC;
 	run_all_tests();
 
-	printf("test_maps: OK\n");
+	printf("test_maps: OK, %d SKIPPED\n", skips);
 	return 0;
 }

tools/testing/selftests/bpf/test_progs.c

@@ -28,7 +28,7 @@ typedef __u16 __sum16;
 #include <sys/wait.h>
 #include <sys/types.h>
 #include <fcntl.h>
-
+#include <pthread.h>
 #include <linux/bpf.h>
 #include <linux/err.h>
 #include <bpf/bpf.h>
@@ -1985,6 +1985,119 @@ static void test_flow_dissector(void)
 	bpf_object__close(obj);
 }
 
+static void *test_spin_lock(void *arg)
+{
+	__u32 duration, retval;
+	int err, prog_fd = *(u32 *) arg;
+
+	err = bpf_prog_test_run(prog_fd, 10000, &pkt_v4, sizeof(pkt_v4),
+				NULL, NULL, &retval, &duration);
+	CHECK(err || retval, "",
+	      "err %d errno %d retval %d duration %d\n",
+	      err, errno, retval, duration);
+	pthread_exit(arg);
+}
+
+static void test_spinlock(void)
+{
+	const char *file = "./test_spin_lock.o";
+	pthread_t thread_id[4];
+	struct bpf_object *obj;
+	int prog_fd;
+	int err = 0, i;
+	void *ret;
+
+	err = bpf_prog_load(file, BPF_PROG_TYPE_CGROUP_SKB, &obj, &prog_fd);
+	if (err) {
+		printf("test_spin_lock:bpf_prog_load errno %d\n", errno);
+		goto close_prog;
+	}
+	for (i = 0; i < 4; i++)
+		assert(pthread_create(&thread_id[i], NULL,
+				      &test_spin_lock, &prog_fd) == 0);
+	for (i = 0; i < 4; i++)
+		assert(pthread_join(thread_id[i], &ret) == 0 &&
+		       ret == (void *)&prog_fd);
+	goto close_prog_noerr;
+close_prog:
+	error_cnt++;
+close_prog_noerr:
+	bpf_object__close(obj);
+}
+
+static void *parallel_map_access(void *arg)
+{
+	int err, map_fd = *(u32 *) arg;
+	int vars[17], i, j, rnd, key = 0;
+
+	for (i = 0; i < 10000; i++) {
+		err = bpf_map_lookup_elem_flags(map_fd, &key, vars, BPF_F_LOCK);
+		if (err) {
+			printf("lookup failed\n");
+			error_cnt++;
+			goto out;
+		}
+		if (vars[0] != 0) {
+			printf("lookup #%d var[0]=%d\n", i, vars[0]);
+			error_cnt++;
+			goto out;
+		}
+		rnd = vars[1];
+		for (j = 2; j < 17; j++) {
+			if (vars[j] == rnd)
+				continue;
+			printf("lookup #%d var[1]=%d var[%d]=%d\n",
+			       i, rnd, j, vars[j]);
+			error_cnt++;
+			goto out;
+		}
+	}
+out:
+	pthread_exit(arg);
+}
+
+static void test_map_lock(void)
+{
+	const char *file = "./test_map_lock.o";
+	int prog_fd, map_fd[2], vars[17] = {};
+	pthread_t thread_id[6];
+	struct bpf_object *obj;
+	int err = 0, key = 0, i;
+	void *ret;
+
+	err = bpf_prog_load(file, BPF_PROG_TYPE_CGROUP_SKB, &obj, &prog_fd);
+	if (err) {
+		printf("test_map_lock:bpf_prog_load errno %d\n", errno);
+		goto close_prog;
+	}
+	map_fd[0] = bpf_find_map(__func__, obj, "hash_map");
+	if (map_fd[0] < 0)
+		goto close_prog;
+	map_fd[1] = bpf_find_map(__func__, obj, "array_map");
+	if (map_fd[1] < 0)
+		goto close_prog;
+
+	bpf_map_update_elem(map_fd[0], &key, vars, BPF_F_LOCK);
+
+	for (i = 0; i < 4; i++)
+		assert(pthread_create(&thread_id[i], NULL,
+				      &test_spin_lock, &prog_fd) == 0);
+	for (i = 4; i < 6; i++)
+		assert(pthread_create(&thread_id[i], NULL,
+				      &parallel_map_access, &map_fd[i - 4]) == 0);
+	for (i = 0; i < 4; i++)
+		assert(pthread_join(thread_id[i], &ret) == 0 &&
+		       ret == (void *)&prog_fd);
+	for (i = 4; i < 6; i++)
+		assert(pthread_join(thread_id[i], &ret) == 0 &&
+		       ret == (void *)&map_fd[i - 4]);
+	goto close_prog_noerr;
+close_prog:
+	error_cnt++;
+close_prog_noerr:
+	bpf_object__close(obj);
+}
+
 int main(void)
 {
 	srand(time(NULL));
@@ -2013,6 +2126,8 @@ int main(void)
 	test_queue_stack_map(QUEUE);
 	test_queue_stack_map(STACK);
 	test_flow_dissector();
+	test_spinlock();
+	test_map_lock();
 
 	printf("Summary: %d PASSED, %d FAILED\n", pass_cnt, error_cnt);
 	return error_cnt ? EXIT_FAILURE : EXIT_SUCCESS;

tools/testing/selftests/bpf/test_spin_lock.c

@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2019 Facebook
+#include <linux/bpf.h>
+#include <linux/version.h>
+#include "bpf_helpers.h"
+
+struct hmap_elem {
+	volatile int cnt;
+	struct bpf_spin_lock lock;
+	int test_padding;
+};
+
+struct bpf_map_def SEC("maps") hmap = {
+	.type = BPF_MAP_TYPE_HASH,
+	.key_size = sizeof(int),
+	.value_size = sizeof(struct hmap_elem),
+	.max_entries = 1,
+};
+
+BPF_ANNOTATE_KV_PAIR(hmap, int, struct hmap_elem);
+
+
+struct cls_elem {
+	struct bpf_spin_lock lock;
+	volatile int cnt;
+};
+
+struct bpf_map_def SEC("maps") cls_map = {
+	.type = BPF_MAP_TYPE_CGROUP_STORAGE,
+	.key_size = sizeof(struct bpf_cgroup_storage_key),
+	.value_size = sizeof(struct cls_elem),
+};
+
+BPF_ANNOTATE_KV_PAIR(cls_map, struct bpf_cgroup_storage_key,
+		     struct cls_elem);
+
+struct bpf_vqueue {
+	struct bpf_spin_lock lock;
+	/* 4 byte hole */
+	unsigned long long lasttime;
+	int credit;
+	unsigned int rate;
+};
+
+struct bpf_map_def SEC("maps") vqueue = {
+	.type = BPF_MAP_TYPE_ARRAY,
+	.key_size = sizeof(int),
+	.value_size = sizeof(struct bpf_vqueue),
+	.max_entries = 1,
+};
+
+BPF_ANNOTATE_KV_PAIR(vqueue, int, struct bpf_vqueue);
+#define CREDIT_PER_NS(delta, rate) (((delta) * rate) >> 20)
+
+SEC("spin_lock_demo")
+int bpf_sping_lock_test(struct __sk_buff *skb)
+{
+	volatile int credit = 0, max_credit = 100, pkt_len = 64;
+	struct hmap_elem zero = {}, *val;
+	unsigned long long curtime;
+	struct bpf_vqueue *q;
+	struct cls_elem *cls;
+	int key = 0;
+	int err = 0;
+
+	val = bpf_map_lookup_elem(&hmap, &key);
+	if (!val) {
+		bpf_map_update_elem(&hmap, &key, &zero, 0);
+		val = bpf_map_lookup_elem(&hmap, &key);
+		if (!val) {
+			err = 1;
+			goto err;
+		}
+	}
+	/* spin_lock in hash map run time test */
+	bpf_spin_lock(&val->lock);
+	if (val->cnt)
+		val->cnt--;
+	else
+		val->cnt++;
+	if (val->cnt != 0 && val->cnt != 1)
+		err = 1;
+	bpf_spin_unlock(&val->lock);
+
+	/* spin_lock in array. virtual queue demo */
+	q = bpf_map_lookup_elem(&vqueue, &key);
+	if (!q)
+		goto err;
+	curtime = bpf_ktime_get_ns();
+	bpf_spin_lock(&q->lock);
+	q->credit += CREDIT_PER_NS(curtime - q->lasttime, q->rate);
+	q->lasttime = curtime;
+	if (q->credit > max_credit)
+		q->credit = max_credit;
+	q->credit -= pkt_len;
+	credit = q->credit;
+	bpf_spin_unlock(&q->lock);
+
+	/* spin_lock in cgroup local storage */
+	cls = bpf_get_local_storage(&cls_map, 0);
+	bpf_spin_lock(&cls->lock);
+	cls->cnt++;
+	bpf_spin_unlock(&cls->lock);
+
+err:
+	return err;
+}
+char _license[] SEC("license") = "GPL";

tools/testing/selftests/bpf/test_verifier.c

@@ -32,8 +32,10 @@
 #include <linux/bpf_perf_event.h>
 #include <linux/bpf.h>
 #include <linux/if_ether.h>
+#include <linux/btf.h>
 
 #include <bpf/bpf.h>
+#include <bpf/libbpf.h>
 
 #ifdef HAVE_GENHDR
 # include "autoconf.h"
@@ -49,7 +51,7 @@
 
 #define MAX_INSNS	BPF_MAXINSNS
 #define MAX_FIXUPS	8
-#define MAX_NR_MAPS	13
+#define MAX_NR_MAPS	14
 #define MAX_TEST_RUNS	8
 #define POINTER_VALUE	0xcafe4all
 #define TEST_DATA_LEN	64
@@ -59,6 +61,7 @@
 
 #define UNPRIV_SYSCTL "kernel/unprivileged_bpf_disabled"
 static bool unpriv_disabled = false;
+static int skips;
 
 struct bpf_test {
 	const char *descr;
@@ -76,6 +79,7 @@ struct bpf_test {
 	int fixup_map_in_map[MAX_FIXUPS];
 	int fixup_cgroup_storage[MAX_FIXUPS];
 	int fixup_percpu_cgroup_storage[MAX_FIXUPS];
+	int fixup_map_spin_lock[MAX_FIXUPS];
 	const char *errstr;
 	const char *errstr_unpriv;
 	uint32_t retval, retval_unpriv, insn_processed;
@@ -263,6 +267,16 @@ static int probe_filter_length(const struct bpf_insn *fp)
 	return len + 1;
 }
 
+static bool skip_unsupported_map(enum bpf_map_type map_type)
+{
+	if (!bpf_probe_map_type(map_type, 0)) {
+		printf("SKIP (unsupported map type %d)\n", map_type);
+		skips++;
+		return true;
+	}
+	return false;
+}
+
 static int create_map(uint32_t type, uint32_t size_key,
 		      uint32_t size_value, uint32_t max_elem)
 {
@@ -270,8 +284,11 @@ static int create_map(uint32_t type, uint32_t size_key,
 
 	fd = bpf_create_map(type, size_key, size_value, max_elem,
 			    type == BPF_MAP_TYPE_HASH ? BPF_F_NO_PREALLOC : 0);
-	if (fd < 0)
+	if (fd < 0) {
+		if (skip_unsupported_map(type))
+			return -1;
 		printf("Failed to create hash map '%s'!\n", strerror(errno));
+	}
 
 	return fd;
 }
@@ -321,6 +338,8 @@ static int create_prog_array(enum bpf_prog_type prog_type, uint32_t max_elem,
 	mfd = bpf_create_map(BPF_MAP_TYPE_PROG_ARRAY, sizeof(int),
 			     sizeof(int), max_elem, 0);
 	if (mfd < 0) {
+		if (skip_unsupported_map(BPF_MAP_TYPE_PROG_ARRAY))
+			return -1;
 		printf("Failed to create prog array '%s'!\n", strerror(errno));
 		return -1;
 	}
@@ -351,15 +370,20 @@ static int create_map_in_map(void)
 	inner_map_fd = bpf_create_map(BPF_MAP_TYPE_ARRAY, sizeof(int),
 				      sizeof(int), 1, 0);
 	if (inner_map_fd < 0) {
+		if (skip_unsupported_map(BPF_MAP_TYPE_ARRAY))
+			return -1;
 		printf("Failed to create array '%s'!\n", strerror(errno));
 		return inner_map_fd;
 	}
 
 	outer_map_fd = bpf_create_map_in_map(BPF_MAP_TYPE_ARRAY_OF_MAPS, NULL,
 					     sizeof(int), inner_map_fd, 1, 0);
-	if (outer_map_fd < 0)
+	if (outer_map_fd < 0) {
+		if (skip_unsupported_map(BPF_MAP_TYPE_ARRAY_OF_MAPS))
+			return -1;
 		printf("Failed to create array of maps '%s'!\n",
 		       strerror(errno));
+	}
 
 	close(inner_map_fd);
 
@@ -374,13 +398,108 @@ static int create_cgroup_storage(bool percpu)
 
 	fd = bpf_create_map(type, sizeof(struct bpf_cgroup_storage_key),
 			    TEST_DATA_LEN, 0, 0);
-	if (fd < 0)
+	if (fd < 0) {
+		if (skip_unsupported_map(type))
+			return -1;
 		printf("Failed to create cgroup storage '%s'!\n",
 		       strerror(errno));
+	}
 
 	return fd;
 }
 
+#define BTF_INFO_ENC(kind, kind_flag, vlen) \
+	((!!(kind_flag) << 31) | ((kind) << 24) | ((vlen) & BTF_MAX_VLEN))
+#define BTF_TYPE_ENC(name, info, size_or_type) \
+	(name), (info), (size_or_type)
+#define BTF_INT_ENC(encoding, bits_offset, nr_bits) \
+	((encoding) << 24 | (bits_offset) << 16 | (nr_bits))
+#define BTF_TYPE_INT_ENC(name, encoding, bits_offset, bits, sz) \
+	BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_INT, 0, 0), sz), \
+	BTF_INT_ENC(encoding, bits_offset, bits)
+#define BTF_MEMBER_ENC(name, type, bits_offset) \
+	(name), (type), (bits_offset)
+
+struct btf_raw_data {
+	__u32 raw_types[64];
+	const char *str_sec;
+	__u32 str_sec_size;
+};
+
+/* struct bpf_spin_lock {
+ *   int val;
+ * };
+ * struct val {
+ *   int cnt;
+ *   struct bpf_spin_lock l;
+ * };
+ */
+static const char btf_str_sec[] = "\0bpf_spin_lock\0val\0cnt\0l";
+static __u32 btf_raw_types[] = {
+	/* int */
+	BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4),  /* [1] */
+	/* struct bpf_spin_lock */                      /* [2] */
+	BTF_TYPE_ENC(1, BTF_INFO_ENC(BTF_KIND_STRUCT, 0, 1), 4),
+	BTF_MEMBER_ENC(15, 1, 0), /* int val; */
+	/* struct val */                                /* [3] */
+	BTF_TYPE_ENC(15, BTF_INFO_ENC(BTF_KIND_STRUCT, 0, 2), 8),
+	BTF_MEMBER_ENC(19, 1, 0), /* int cnt; */
+	BTF_MEMBER_ENC(23, 2, 32),/* struct bpf_spin_lock l; */
+};
+
+static int load_btf(void)
+{
+	struct btf_header hdr = {
+		.magic = BTF_MAGIC,
+		.version = BTF_VERSION,
+		.hdr_len = sizeof(struct btf_header),
+		.type_len = sizeof(btf_raw_types),
+		.str_off = sizeof(btf_raw_types),
+		.str_len = sizeof(btf_str_sec),
+	};
+	void *ptr, *raw_btf;
+	int btf_fd;
+
+	ptr = raw_btf = malloc(sizeof(hdr) + sizeof(btf_raw_types) +
+			       sizeof(btf_str_sec));
+
+	memcpy(ptr, &hdr, sizeof(hdr));
+	ptr += sizeof(hdr);
+	memcpy(ptr, btf_raw_types, hdr.type_len);
+	ptr += hdr.type_len;
+	memcpy(ptr, btf_str_sec, hdr.str_len);
+	ptr += hdr.str_len;
+
+	btf_fd = bpf_load_btf(raw_btf, ptr - raw_btf, 0, 0, 0);
+	free(raw_btf);
+	if (btf_fd < 0)
+		return -1;
+	return btf_fd;
+}
+
+static int create_map_spin_lock(void)
+{
+	struct bpf_create_map_attr attr = {
+		.name = "test_map",
+		.map_type = BPF_MAP_TYPE_ARRAY,
+		.key_size = 4,
+		.value_size = 8,
+		.max_entries = 1,
+		.btf_key_type_id = 1,
+		.btf_value_type_id = 3,
+	};
+	int fd, btf_fd;
+
+	btf_fd = load_btf();
+	if (btf_fd < 0)
+		return -1;
+	attr.btf_fd = btf_fd;
+	fd = bpf_create_map_xattr(&attr);
+	if (fd < 0)
+		printf("Failed to create map with spin_lock\n");
+	return fd;
+}
+
 static char bpf_vlog[UINT_MAX >> 8];
 
 static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
@@ -399,6 +518,7 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
 	int *fixup_map_in_map = test->fixup_map_in_map;
 	int *fixup_cgroup_storage = test->fixup_cgroup_storage;
 	int *fixup_percpu_cgroup_storage = test->fixup_percpu_cgroup_storage;
+	int *fixup_map_spin_lock = test->fixup_map_spin_lock;
 
 	if (test->fill_helper)
 		test->fill_helper(test);
@@ -515,6 +635,13 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
 			fixup_map_stacktrace++;
 		} while (*fixup_map_stacktrace);
 	}
+	if (*fixup_map_spin_lock) {
+		map_fds[13] = create_map_spin_lock();
+		do {
+			prog[*fixup_map_spin_lock].imm = map_fds[13];
+			fixup_map_spin_lock++;
+		} while (*fixup_map_spin_lock);
+	}
 }
 
 static int set_admin(bool admin)
@@ -580,6 +707,7 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
 	int run_errs, run_successes;
 	int map_fds[MAX_NR_MAPS];
 	const char *expected_err;
+	int fixup_skips;
 	__u32 pflags;
 	int i, err;
 
@@ -588,7 +716,13 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
 
 	if (!prog_type)
 		prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
+	fixup_skips = skips;
 	do_test_fixup(test, prog_type, prog, map_fds);
+	/* If there were some map skips during fixup due to missing bpf
+	 * features, skip this test.
+	 */
+	if (fixup_skips != skips)
+		return;
 	prog_len = probe_filter_length(prog);
 
 	pflags = 0;
@@ -598,6 +732,11 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
 		pflags |= BPF_F_ANY_ALIGNMENT;
 	fd_prog = bpf_verify_program(prog_type, prog, prog_len, pflags,
 				     "GPL", 0, bpf_vlog, sizeof(bpf_vlog), 1);
+	if (fd_prog < 0 && !bpf_probe_prog_type(prog_type, 0)) {
+		printf("SKIP (unsupported program type %d)\n", prog_type);
+		skips++;
+		goto close_fds;
+	}
 
 	expected_ret = unpriv && test->result_unpriv != UNDEF ?
 		       test->result_unpriv : test->result;
@@ -751,7 +890,7 @@ static bool test_as_unpriv(struct bpf_test *test)
 
 static int do_test(bool unpriv, unsigned int from, unsigned int to)
 {
-	int i, passes = 0, errors = 0, skips = 0;
+	int i, passes = 0, errors = 0;
 
 	for (i = from; i < to; i++) {
 		struct bpf_test *test = &tests[i];

tools/testing/selftests/bpf/verifier/spin_lock.c

@@ -0,0 +1,331 @@
+{
+	"spin_lock: test1 success",
+	.insns = {
+	BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
+	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
+	BPF_LD_MAP_FD(BPF_REG_1,
+		      0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+	BPF_EXIT_INSN(),
+	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, 0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.fixup_map_spin_lock = { 3 },
+	.result = ACCEPT,
+	.result_unpriv = REJECT,
+	.errstr_unpriv = "",
+	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
+},
+{
+	"spin_lock: test2 direct ld/st",
+	.insns = {
+	BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
+	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
+	BPF_LD_MAP_FD(BPF_REG_1,
+		      0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+	BPF_EXIT_INSN(),
+	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, 0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.fixup_map_spin_lock = { 3 },
+	.result = REJECT,
+	.errstr = "cannot be accessed directly",
+	.result_unpriv = REJECT,
+	.errstr_unpriv = "",
+	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
+},
+{
+	"spin_lock: test3 direct ld/st",
+	.insns = {
+	BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
+	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
+	BPF_LD_MAP_FD(BPF_REG_1,
+		      0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+	BPF_EXIT_INSN(),
+	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, 1),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.fixup_map_spin_lock = { 3 },
+	.result = REJECT,
+	.errstr = "cannot be accessed directly",
+	.result_unpriv = REJECT,
+	.errstr_unpriv = "",
+	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
+},
+{
+	"spin_lock: test4 direct ld/st",
+	.insns = {
+	BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
+	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
+	BPF_LD_MAP_FD(BPF_REG_1,
+		      0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+	BPF_EXIT_INSN(),
+	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_LDX_MEM(BPF_H, BPF_REG_0, BPF_REG_6, 3),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.fixup_map_spin_lock = { 3 },
+	.result = REJECT,
+	.errstr = "cannot be accessed directly",
+	.result_unpriv = REJECT,
+	.errstr_unpriv = "",
+	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
+},
+{
+	"spin_lock: test5 call within a locked region",
+	.insns = {
+	BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
+	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
+	BPF_LD_MAP_FD(BPF_REG_1,
+		      0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+	BPF_EXIT_INSN(),
+	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.fixup_map_spin_lock = { 3 },
+	.result = REJECT,
+	.errstr = "calls are not allowed",
+	.result_unpriv = REJECT,
+	.errstr_unpriv = "",
+	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
+},
+{
+	"spin_lock: test6 missing unlock",
+	.insns = {
+	BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
+	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
+	BPF_LD_MAP_FD(BPF_REG_1,
+		      0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+	BPF_EXIT_INSN(),
+	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, 0),
+	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.fixup_map_spin_lock = { 3 },
+	.result = REJECT,
+	.errstr = "unlock is missing",
+	.result_unpriv = REJECT,
+	.errstr_unpriv = "",
+	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
+},
+{
+	"spin_lock: test7 unlock without lock",
+	.insns = {
+	BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
+	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
+	BPF_LD_MAP_FD(BPF_REG_1,
+		      0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+	BPF_EXIT_INSN(),
+	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 1),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, 0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.fixup_map_spin_lock = { 3 },
+	.result = REJECT,
+	.errstr = "without taking a lock",
+	.result_unpriv = REJECT,
+	.errstr_unpriv = "",
+	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
+},
+{
+	"spin_lock: test8 double lock",
+	.insns = {
+	BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
+	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
+	BPF_LD_MAP_FD(BPF_REG_1,
+		      0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+	BPF_EXIT_INSN(),
+	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, 0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.fixup_map_spin_lock = { 3 },
+	.result = REJECT,
+	.errstr = "calls are not allowed",
+	.result_unpriv = REJECT,
+	.errstr_unpriv = "",
+	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
+},
+{
+	"spin_lock: test9 different lock",
+	.insns = {
+	BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
+	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
+	BPF_LD_MAP_FD(BPF_REG_1,
+		      0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+	BPF_EXIT_INSN(),
+	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
+	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
+	BPF_LD_MAP_FD(BPF_REG_1,
+		      0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+	BPF_EXIT_INSN(),
+	BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.fixup_map_spin_lock = { 3, 11 },
+	.result = REJECT,
+	.errstr = "unlock of different lock",
+	.result_unpriv = REJECT,
+	.errstr_unpriv = "",
+	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
+},
+{
+	"spin_lock: test10 lock in subprog without unlock",
+	.insns = {
+	BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
+	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
+	BPF_LD_MAP_FD(BPF_REG_1,
+		      0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+	BPF_EXIT_INSN(),
+	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 5),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
+	BPF_MOV64_IMM(BPF_REG_0, 1),
+	BPF_EXIT_INSN(),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.fixup_map_spin_lock = { 3 },
+	.result = REJECT,
+	.errstr = "unlock is missing",
+	.result_unpriv = REJECT,
+	.errstr_unpriv = "",
+	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
+},
+{
+	"spin_lock: test11 ld_abs under lock",
+	.insns = {
+	BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+	BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
+	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
+	BPF_LD_MAP_FD(BPF_REG_1,
+		      0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+	BPF_EXIT_INSN(),
+	BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_lock),
+	BPF_LD_ABS(BPF_B, 0),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_spin_unlock),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.fixup_map_spin_lock = { 4 },
+	.result = REJECT,
+	.errstr = "inside bpf_spin_lock",
+	.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+},

tools/testing/selftests/bpf/verifier/unpriv.c

@@ -76,6 +76,7 @@
 	.errstr_unpriv = "unknown func bpf_trace_printk#6",
 	.result_unpriv = REJECT,
 	.result = ACCEPT,
+	.prog_type = BPF_PROG_TYPE_TRACEPOINT,
 },
 {
 	"unpriv: pass pointer to helper function",