Orange Pi5 kernel

 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
/* Copyright (c) 2019 Netronome Systems, Inc. */
 
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <net/if.h>
#include <sys/utsname.h>
 
#include <linux/btf.h>
#include <linux/filter.h>
#include <linux/kernel.h>
 
#include "bpf.h"
#include "libbpf.h"
#include "libbpf_internal.h"
 
static bool grep(const char *buffer, const char *pattern)
{
<------>return !!strstr(buffer, pattern);
}
 
static int get_vendor_id(int ifindex)
{
<------>char ifname[IF_NAMESIZE], path[64], buf[8];
<------>ssize_t len;
<------>int fd;
 
<------>if (!if_indextoname(ifindex, ifname))
<------><------>return -1;
 
<------>snprintf(path, sizeof(path), "/sys/class/net/%s/device/vendor", ifname);
 
<------>fd = open(path, O_RDONLY);
<------>if (fd < 0)
<------><------>return -1;
 
<------>len = read(fd, buf, sizeof(buf));
<------>close(fd);
<------>if (len < 0)
<------><------>return -1;
<------>if (len >= (ssize_t)sizeof(buf))
<------><------>return -1;
<------>buf[len] = '\0';
 
<------>return strtol(buf, NULL, 0);
}
 
static int get_kernel_version(void)
{
<------>int version, subversion, patchlevel;
<------>struct utsname utsn;
 
<------>/* Return 0 on failure, and attempt to probe with empty kversion */
<------>if (uname(&utsn))
<------><------>return 0;
 
<------>if (sscanf(utsn.release, "%d.%d.%d",
<------><------>   &version, &subversion, &patchlevel) != 3)
<------><------>return 0;
 
<------>return (version << 16) + (subversion << 8) + patchlevel;
}
 
static void
probe_load(enum bpf_prog_type prog_type, const struct bpf_insn *insns,
<------>   size_t insns_cnt, char *buf, size_t buf_len, __u32 ifindex)
{
<------>struct bpf_load_program_attr xattr = {};
<------>int fd;
 
<------>switch (prog_type) {
<------>case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
<------><------>xattr.expected_attach_type = BPF_CGROUP_INET4_CONNECT;
<------><------>break;
<------>case BPF_PROG_TYPE_CGROUP_SOCKOPT:
<------><------>xattr.expected_attach_type = BPF_CGROUP_GETSOCKOPT;
<------><------>break;
<------>case BPF_PROG_TYPE_SK_LOOKUP:
<------><------>xattr.expected_attach_type = BPF_SK_LOOKUP;
<------><------>break;
<------>case BPF_PROG_TYPE_KPROBE:
<------><------>xattr.kern_version = get_kernel_version();
<------><------>break;
<------>case BPF_PROG_TYPE_UNSPEC:
<------>case BPF_PROG_TYPE_SOCKET_FILTER:
<------>case BPF_PROG_TYPE_SCHED_CLS:
<------>case BPF_PROG_TYPE_SCHED_ACT:
<------>case BPF_PROG_TYPE_TRACEPOINT:
<------>case BPF_PROG_TYPE_XDP:
<------>case BPF_PROG_TYPE_PERF_EVENT:
<------>case BPF_PROG_TYPE_CGROUP_SKB:
<------>case BPF_PROG_TYPE_CGROUP_SOCK:
<------>case BPF_PROG_TYPE_LWT_IN:
<------>case BPF_PROG_TYPE_LWT_OUT:
<------>case BPF_PROG_TYPE_LWT_XMIT:
<------>case BPF_PROG_TYPE_SOCK_OPS:
<------>case BPF_PROG_TYPE_SK_SKB:
<------>case BPF_PROG_TYPE_CGROUP_DEVICE:
<------>case BPF_PROG_TYPE_SK_MSG:
<------>case BPF_PROG_TYPE_RAW_TRACEPOINT:
<------>case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
<------>case BPF_PROG_TYPE_LWT_SEG6LOCAL:
<------>case BPF_PROG_TYPE_LIRC_MODE2:
<------>case BPF_PROG_TYPE_SK_REUSEPORT:
<------>case BPF_PROG_TYPE_FLOW_DISSECTOR:
<------>case BPF_PROG_TYPE_CGROUP_SYSCTL:
<------>case BPF_PROG_TYPE_TRACING:
<------>case BPF_PROG_TYPE_STRUCT_OPS:
<------>case BPF_PROG_TYPE_EXT:
<------>case BPF_PROG_TYPE_LSM:
<------>default:
<------><------>break;
<------>}
 
<------>xattr.prog_type = prog_type;
<------>xattr.insns = insns;
<------>xattr.insns_cnt = insns_cnt;
<------>xattr.license = "GPL";
<------>xattr.prog_ifindex = ifindex;
 
<------>fd = bpf_load_program_xattr(&xattr, buf, buf_len);
<------>if (fd >= 0)
<------><------>close(fd);
}
 
bool bpf_probe_prog_type(enum bpf_prog_type prog_type, __u32 ifindex)
{
<------>struct bpf_insn insns[2] = {
<------><------>BPF_MOV64_IMM(BPF_REG_0, 0),
<------><------>BPF_EXIT_INSN()
<------>};
 
<------>if (ifindex && prog_type == BPF_PROG_TYPE_SCHED_CLS)
<------><------>/* nfp returns -EINVAL on exit(0) with TC offload */
<------><------>insns[0].imm = 2;
 
<------>errno = 0;
<------>probe_load(prog_type, insns, ARRAY_SIZE(insns), NULL, 0, ifindex);
 
<------>return errno != EINVAL && errno != EOPNOTSUPP;
}
 
int libbpf__load_raw_btf(const char *raw_types, size_t types_len,
<------><------><------> const char *str_sec, size_t str_len)
{
<------>struct btf_header hdr = {
<------><------>.magic = BTF_MAGIC,
<------><------>.version = BTF_VERSION,
<------><------>.hdr_len = sizeof(struct btf_header),
<------><------>.type_len = types_len,
<------><------>.str_off = types_len,
<------><------>.str_len = str_len,
<------>};
<------>int btf_fd, btf_len;
<------>__u8 *raw_btf;
 
<------>btf_len = hdr.hdr_len + hdr.type_len + hdr.str_len;
<------>raw_btf = malloc(btf_len);
<------>if (!raw_btf)
<------><------>return -ENOMEM;
 
<------>memcpy(raw_btf, &hdr, sizeof(hdr));
<------>memcpy(raw_btf + hdr.hdr_len, raw_types, hdr.type_len);
<------>memcpy(raw_btf + hdr.hdr_len + hdr.type_len, str_sec, hdr.str_len);
 
<------>btf_fd = bpf_load_btf(raw_btf, btf_len, NULL, 0, false);
 
<------>free(raw_btf);
<------>return btf_fd;
}
 
static int load_local_storage_btf(void)
{
<------>const char strs[] = "\0bpf_spin_lock\0val\0cnt\0l";
<------>/* struct bpf_spin_lock {
<------> *   int val;
<------> * };
<------> * struct val {
<------> *   int cnt;
<------> *   struct bpf_spin_lock l;
<------> * };
<------> */
<------>__u32 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; */
<------>};
 
<------>return libbpf__load_raw_btf((char *)types, sizeof(types),
<------><------><------><------>     strs, sizeof(strs));
}
 
bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex)
{
<------>int key_size, value_size, max_entries, map_flags;
<------>__u32 btf_key_type_id = 0, btf_value_type_id = 0;
<------>struct bpf_create_map_attr attr = {};
<------>int fd = -1, btf_fd = -1, fd_inner;
 
<------>key_size	= sizeof(__u32);
<------>value_size	= sizeof(__u32);
<------>max_entries	= 1;
<------>map_flags	= 0;
 
<------>switch (map_type) {
<------>case BPF_MAP_TYPE_STACK_TRACE:
<------><------>value_size	= sizeof(__u64);
<------><------>break;
<------>case BPF_MAP_TYPE_LPM_TRIE:
<------><------>key_size	= sizeof(__u64);
<------><------>value_size	= sizeof(__u64);
<------><------>map_flags	= BPF_F_NO_PREALLOC;
<------><------>break;
<------>case BPF_MAP_TYPE_CGROUP_STORAGE:
<------>case BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE:
<------><------>key_size	= sizeof(struct bpf_cgroup_storage_key);
<------><------>value_size	= sizeof(__u64);
<------><------>max_entries	= 0;
<------><------>break;
<------>case BPF_MAP_TYPE_QUEUE:
<------>case BPF_MAP_TYPE_STACK:
<------><------>key_size	= 0;
<------><------>break;
<------>case BPF_MAP_TYPE_SK_STORAGE:
<------>case BPF_MAP_TYPE_INODE_STORAGE:
<------><------>btf_key_type_id = 1;
<------><------>btf_value_type_id = 3;
<------><------>value_size = 8;
<------><------>max_entries = 0;
<------><------>map_flags = BPF_F_NO_PREALLOC;
<------><------>btf_fd = load_local_storage_btf();
<------><------>if (btf_fd < 0)
<------><------><------>return false;
<------><------>break;
<------>case BPF_MAP_TYPE_RINGBUF:
<------><------>key_size = 0;
<------><------>value_size = 0;
<------><------>max_entries = 4096;
<------><------>break;
<------>case BPF_MAP_TYPE_UNSPEC:
<------>case BPF_MAP_TYPE_HASH:
<------>case BPF_MAP_TYPE_ARRAY:
<------>case BPF_MAP_TYPE_PROG_ARRAY:
<------>case BPF_MAP_TYPE_PERF_EVENT_ARRAY:
<------>case BPF_MAP_TYPE_PERCPU_HASH:
<------>case BPF_MAP_TYPE_PERCPU_ARRAY:
<------>case BPF_MAP_TYPE_CGROUP_ARRAY:
<------>case BPF_MAP_TYPE_LRU_HASH:
<------>case BPF_MAP_TYPE_LRU_PERCPU_HASH:
<------>case BPF_MAP_TYPE_ARRAY_OF_MAPS:
<------>case BPF_MAP_TYPE_HASH_OF_MAPS:
<------>case BPF_MAP_TYPE_DEVMAP:
<------>case BPF_MAP_TYPE_DEVMAP_HASH:
<------>case BPF_MAP_TYPE_SOCKMAP:
<------>case BPF_MAP_TYPE_CPUMAP:
<------>case BPF_MAP_TYPE_XSKMAP:
<------>case BPF_MAP_TYPE_SOCKHASH:
<------>case BPF_MAP_TYPE_REUSEPORT_SOCKARRAY:
<------>case BPF_MAP_TYPE_STRUCT_OPS:
<------>default:
<------><------>break;
<------>}
 
<------>if (map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS ||
<------>    map_type == BPF_MAP_TYPE_HASH_OF_MAPS) {
<------><------>/* TODO: probe for device, once libbpf has a function to create
<------><------> * map-in-map for offload
<------><------> */
<------><------>if (ifindex)
<------><------><------>return false;
 
<------><------>fd_inner = bpf_create_map(BPF_MAP_TYPE_HASH,
<------><------><------><------><------>  sizeof(__u32), sizeof(__u32), 1, 0);
<------><------>if (fd_inner < 0)
<------><------><------>return false;
<------><------>fd = bpf_create_map_in_map(map_type, NULL, sizeof(__u32),
<------><------><------><------><------>   fd_inner, 1, 0);
<------><------>close(fd_inner);
<------>} else {
<------><------>/* Note: No other restriction on map type probes for offload */
<------><------>attr.map_type = map_type;
<------><------>attr.key_size = key_size;
<------><------>attr.value_size = value_size;
<------><------>attr.max_entries = max_entries;
<------><------>attr.map_flags = map_flags;
<------><------>attr.map_ifindex = ifindex;
<------><------>if (btf_fd >= 0) {
<------><------><------>attr.btf_fd = btf_fd;
<------><------><------>attr.btf_key_type_id = btf_key_type_id;
<------><------><------>attr.btf_value_type_id = btf_value_type_id;
<------><------>}
 
<------><------>fd = bpf_create_map_xattr(&attr);
<------>}
<------>if (fd >= 0)
<------><------>close(fd);
<------>if (btf_fd >= 0)
<------><------>close(btf_fd);
 
<------>return fd >= 0;
}
 
bool bpf_probe_helper(enum bpf_func_id id, enum bpf_prog_type prog_type,
<------><------>      __u32 ifindex)
{
<------>struct bpf_insn insns[2] = {
<------><------>BPF_EMIT_CALL(id),
<------><------>BPF_EXIT_INSN()
<------>};
<------>char buf[4096] = {};
<------>bool res;
 
<------>probe_load(prog_type, insns, ARRAY_SIZE(insns), buf, sizeof(buf),
<------><------>   ifindex);
<------>res = !grep(buf, "invalid func ") && !grep(buf, "unknown func ");
 
<------>if (ifindex) {
<------><------>switch (get_vendor_id(ifindex)) {
<------><------>case 0x19ee: /* Netronome specific */
<------><------><------>res = res && !grep(buf, "not supported by FW") &&
<------><------><------><------>!grep(buf, "unsupported function id");
<------><------><------>break;
<------><------>default:
<------><------><------>break;
<------><------>}
<------>}
 
<------>return res;
}
 
/*
 * Probe for availability of kernel commit (5.3):
 *
 * c04c0d2b968a ("bpf: increase complexity limit and maximum program size")
 */
bool bpf_probe_large_insn_limit(__u32 ifindex)
{
<------>struct bpf_insn insns[BPF_MAXINSNS + 1];
<------>int i;
 
<------>for (i = 0; i < BPF_MAXINSNS; i++)
<------><------>insns[i] = BPF_MOV64_IMM(BPF_REG_0, 1);
<------>insns[BPF_MAXINSNS] = BPF_EXIT_INSN();
 
<------>errno = 0;
<------>probe_load(BPF_PROG_TYPE_SCHED_CLS, insns, ARRAY_SIZE(insns), NULL, 0,
<------><------>   ifindex);
 
<------>return errno != E2BIG && errno != EINVAL;
}

	// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
	/* Copyright (c) 2019 Netronome Systems, Inc. */

	#include <errno.h>
	#include <fcntl.h>
	#include <string.h>
	#include <stdlib.h>
	#include <unistd.h>
	#include <net/if.h>
	#include <sys/utsname.h>

	#include <linux/btf.h>
	#include <linux/filter.h>
	#include <linux/kernel.h>

	#include "bpf.h"
	#include "libbpf.h"
	#include "libbpf_internal.h"

	static bool grep(const char buffer, const char pattern)
	{
	<------>return !!strstr(buffer, pattern);
	}

	static int get_vendor_id(int ifindex)
	{
	<------>char ifname[IF_NAMESIZE], path[64], buf[8];
	<------>ssize_t len;
	<------>int fd;

	<------>if (!if_indextoname(ifindex, ifname))
	<------><------>return -1;

	<------>snprintf(path, sizeof(path), "/sys/class/net/%s/device/vendor", ifname);

	<------>fd = open(path, O_RDONLY);
	<------>if (fd < 0)
	<------><------>return -1;

	<------>len = read(fd, buf, sizeof(buf));
	<------>close(fd);
	<------>if (len < 0)
	<------><------>return -1;
	<------>if (len >= (ssize_t)sizeof(buf))
	<------><------>return -1;
	<------>buf[len] = '\0';

	<------>return strtol(buf, NULL, 0);
	}

	static int get_kernel_version(void)
	{
	<------>int version, subversion, patchlevel;
	<------>struct utsname utsn;

	<------>/* Return 0 on failure, and attempt to probe with empty kversion */
	<------>if (uname(&utsn))
	<------><------>return 0;

	<------>if (sscanf(utsn.release, "%d.%d.%d",
	<------><------> &version, &subversion, &patchlevel) != 3)
	<------><------>return 0;

	<------>return (version << 16) + (subversion << 8) + patchlevel;
	}

	static void
	probe_load(enum bpf_prog_type prog_type, const struct bpf_insn *insns,
	<------> size_t insns_cnt, char *buf, size_t buf_len, __u32 ifindex)
	{
	<------>struct bpf_load_program_attr xattr = {};
	<------>int fd;

	<------>switch (prog_type) {
	<------>case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
	<------><------>xattr.expected_attach_type = BPF_CGROUP_INET4_CONNECT;
	<------><------>break;
	<------>case BPF_PROG_TYPE_CGROUP_SOCKOPT:
	<------><------>xattr.expected_attach_type = BPF_CGROUP_GETSOCKOPT;
	<------><------>break;
	<------>case BPF_PROG_TYPE_SK_LOOKUP:
	<------><------>xattr.expected_attach_type = BPF_SK_LOOKUP;
	<------><------>break;
	<------>case BPF_PROG_TYPE_KPROBE:
	<------><------>xattr.kern_version = get_kernel_version();
	<------><------>break;
	<------>case BPF_PROG_TYPE_UNSPEC:
	<------>case BPF_PROG_TYPE_SOCKET_FILTER:
	<------>case BPF_PROG_TYPE_SCHED_CLS:
	<------>case BPF_PROG_TYPE_SCHED_ACT:
	<------>case BPF_PROG_TYPE_TRACEPOINT:
	<------>case BPF_PROG_TYPE_XDP:
	<------>case BPF_PROG_TYPE_PERF_EVENT:
	<------>case BPF_PROG_TYPE_CGROUP_SKB:
	<------>case BPF_PROG_TYPE_CGROUP_SOCK:
	<------>case BPF_PROG_TYPE_LWT_IN:
	<------>case BPF_PROG_TYPE_LWT_OUT:
	<------>case BPF_PROG_TYPE_LWT_XMIT:
	<------>case BPF_PROG_TYPE_SOCK_OPS:
	<------>case BPF_PROG_TYPE_SK_SKB:
	<------>case BPF_PROG_TYPE_CGROUP_DEVICE:
	<------>case BPF_PROG_TYPE_SK_MSG:
	<------>case BPF_PROG_TYPE_RAW_TRACEPOINT:
	<------>case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
	<------>case BPF_PROG_TYPE_LWT_SEG6LOCAL:
	<------>case BPF_PROG_TYPE_LIRC_MODE2:
	<------>case BPF_PROG_TYPE_SK_REUSEPORT:
	<------>case BPF_PROG_TYPE_FLOW_DISSECTOR:
	<------>case BPF_PROG_TYPE_CGROUP_SYSCTL:
	<------>case BPF_PROG_TYPE_TRACING:
	<------>case BPF_PROG_TYPE_STRUCT_OPS:
	<------>case BPF_PROG_TYPE_EXT:
	<------>case BPF_PROG_TYPE_LSM:
	<------>default:
	<------><------>break;
	<------>}

	<------>xattr.prog_type = prog_type;
	<------>xattr.insns = insns;
	<------>xattr.insns_cnt = insns_cnt;
	<------>xattr.license = "GPL";
	<------>xattr.prog_ifindex = ifindex;

	<------>fd = bpf_load_program_xattr(&xattr, buf, buf_len);
	<------>if (fd >= 0)
	<------><------>close(fd);
	}

	bool bpf_probe_prog_type(enum bpf_prog_type prog_type, __u32 ifindex)
	{
	<------>struct bpf_insn insns[2] = {
	<------><------>BPF_MOV64_IMM(BPF_REG_0, 0),
	<------><------>BPF_EXIT_INSN()
	<------>};

	<------>if (ifindex && prog_type == BPF_PROG_TYPE_SCHED_CLS)
	<------><------>/* nfp returns -EINVAL on exit(0) with TC offload */
	<------><------>insns[0].imm = 2;

	<------>errno = 0;
	<------>probe_load(prog_type, insns, ARRAY_SIZE(insns), NULL, 0, ifindex);

	<------>return errno != EINVAL && errno != EOPNOTSUPP;
	}

	int libbpf__load_raw_btf(const char *raw_types, size_t types_len,
	<------><------><------> const char *str_sec, size_t str_len)
	{
	<------>struct btf_header hdr = {
	<------><------>.magic = BTF_MAGIC,
	<------><------>.version = BTF_VERSION,
	<------><------>.hdr_len = sizeof(struct btf_header),
	<------><------>.type_len = types_len,
	<------><------>.str_off = types_len,
	<------><------>.str_len = str_len,
	<------>};
	<------>int btf_fd, btf_len;
	<------>__u8 *raw_btf;

	<------>btf_len = hdr.hdr_len + hdr.type_len + hdr.str_len;
	<------>raw_btf = malloc(btf_len);
	<------>if (!raw_btf)
	<------><------>return -ENOMEM;

	<------>memcpy(raw_btf, &hdr, sizeof(hdr));
	<------>memcpy(raw_btf + hdr.hdr_len, raw_types, hdr.type_len);
	<------>memcpy(raw_btf + hdr.hdr_len + hdr.type_len, str_sec, hdr.str_len);

	<------>btf_fd = bpf_load_btf(raw_btf, btf_len, NULL, 0, false);

	<------>free(raw_btf);
	<------>return btf_fd;
	}

	static int load_local_storage_btf(void)
	{
	<------>const char strs[] = "\0bpf_spin_lock\0val\0cnt\0l";
	<------>/* struct bpf_spin_lock {
	<------> * int val;
	<------> * };
	<------> * struct val {
	<------> * int cnt;
	<------> * struct bpf_spin_lock l;
	<------> * };
	<------> */
	<------>__u32 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; */
	<------>};

	<------>return libbpf__load_raw_btf((char *)types, sizeof(types),
	<------><------><------><------> strs, sizeof(strs));
	}

	bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex)
	{
	<------>int key_size, value_size, max_entries, map_flags;
	<------>__u32 btf_key_type_id = 0, btf_value_type_id = 0;
	<------>struct bpf_create_map_attr attr = {};
	<------>int fd = -1, btf_fd = -1, fd_inner;

	<------>key_size = sizeof(__u32);
	<------>value_size = sizeof(__u32);
	<------>max_entries = 1;
	<------>map_flags = 0;

	<------>switch (map_type) {
	<------>case BPF_MAP_TYPE_STACK_TRACE:
	<------><------>value_size = sizeof(__u64);
	<------><------>break;
	<------>case BPF_MAP_TYPE_LPM_TRIE:
	<------><------>key_size = sizeof(__u64);
	<------><------>value_size = sizeof(__u64);
	<------><------>map_flags = BPF_F_NO_PREALLOC;
	<------><------>break;
	<------>case BPF_MAP_TYPE_CGROUP_STORAGE:
	<------>case BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE:
	<------><------>key_size = sizeof(struct bpf_cgroup_storage_key);
	<------><------>value_size = sizeof(__u64);
	<------><------>max_entries = 0;
	<------><------>break;
	<------>case BPF_MAP_TYPE_QUEUE:
	<------>case BPF_MAP_TYPE_STACK:
	<------><------>key_size = 0;
	<------><------>break;
	<------>case BPF_MAP_TYPE_SK_STORAGE:
	<------>case BPF_MAP_TYPE_INODE_STORAGE:
	<------><------>btf_key_type_id = 1;
	<------><------>btf_value_type_id = 3;
	<------><------>value_size = 8;
	<------><------>max_entries = 0;
	<------><------>map_flags = BPF_F_NO_PREALLOC;
	<------><------>btf_fd = load_local_storage_btf();
	<------><------>if (btf_fd < 0)
	<------><------><------>return false;
	<------><------>break;
	<------>case BPF_MAP_TYPE_RINGBUF:
	<------><------>key_size = 0;
	<------><------>value_size = 0;
	<------><------>max_entries = 4096;
	<------><------>break;
	<------>case BPF_MAP_TYPE_UNSPEC:
	<------>case BPF_MAP_TYPE_HASH:
	<------>case BPF_MAP_TYPE_ARRAY:
	<------>case BPF_MAP_TYPE_PROG_ARRAY:
	<------>case BPF_MAP_TYPE_PERF_EVENT_ARRAY:
	<------>case BPF_MAP_TYPE_PERCPU_HASH:
	<------>case BPF_MAP_TYPE_PERCPU_ARRAY:
	<------>case BPF_MAP_TYPE_CGROUP_ARRAY:
	<------>case BPF_MAP_TYPE_LRU_HASH:
	<------>case BPF_MAP_TYPE_LRU_PERCPU_HASH:
	<------>case BPF_MAP_TYPE_ARRAY_OF_MAPS:
	<------>case BPF_MAP_TYPE_HASH_OF_MAPS:
	<------>case BPF_MAP_TYPE_DEVMAP:
	<------>case BPF_MAP_TYPE_DEVMAP_HASH:
	<------>case BPF_MAP_TYPE_SOCKMAP:
	<------>case BPF_MAP_TYPE_CPUMAP:
	<------>case BPF_MAP_TYPE_XSKMAP:
	<------>case BPF_MAP_TYPE_SOCKHASH:
	<------>case BPF_MAP_TYPE_REUSEPORT_SOCKARRAY:
	<------>case BPF_MAP_TYPE_STRUCT_OPS:
	<------>default:
	<------><------>break;
	<------>}

	<------>if (map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS \|\|
	<------> map_type == BPF_MAP_TYPE_HASH_OF_MAPS) {
	<------><------>/* TODO: probe for device, once libbpf has a function to create
	<------><------> * map-in-map for offload
	<------><------> */
	<------><------>if (ifindex)
	<------><------><------>return false;

	<------><------>fd_inner = bpf_create_map(BPF_MAP_TYPE_HASH,
	<------><------><------><------><------> sizeof(__u32), sizeof(__u32), 1, 0);
	<------><------>if (fd_inner < 0)
	<------><------><------>return false;
	<------><------>fd = bpf_create_map_in_map(map_type, NULL, sizeof(__u32),
	<------><------><------><------><------> fd_inner, 1, 0);
	<------><------>close(fd_inner);
	<------>} else {
	<------><------>/* Note: No other restriction on map type probes for offload */
	<------><------>attr.map_type = map_type;
	<------><------>attr.key_size = key_size;
	<------><------>attr.value_size = value_size;
	<------><------>attr.max_entries = max_entries;
	<------><------>attr.map_flags = map_flags;
	<------><------>attr.map_ifindex = ifindex;
	<------><------>if (btf_fd >= 0) {
	<------><------><------>attr.btf_fd = btf_fd;
	<------><------><------>attr.btf_key_type_id = btf_key_type_id;
	<------><------><------>attr.btf_value_type_id = btf_value_type_id;
	<------><------>}

	<------><------>fd = bpf_create_map_xattr(&attr);
	<------>}
	<------>if (fd >= 0)
	<------><------>close(fd);
	<------>if (btf_fd >= 0)
	<------><------>close(btf_fd);

	<------>return fd >= 0;
	}

	bool bpf_probe_helper(enum bpf_func_id id, enum bpf_prog_type prog_type,
	<------><------> __u32 ifindex)
	{
	<------>struct bpf_insn insns[2] = {
	<------><------>BPF_EMIT_CALL(id),
	<------><------>BPF_EXIT_INSN()
	<------>};
	<------>char buf[4096] = {};
	<------>bool res;

	<------>probe_load(prog_type, insns, ARRAY_SIZE(insns), buf, sizeof(buf),
	<------><------> ifindex);
	<------>res = !grep(buf, "invalid func ") && !grep(buf, "unknown func ");

	<------>if (ifindex) {
	<------><------>switch (get_vendor_id(ifindex)) {
	<------><------>case 0x19ee: /* Netronome specific */
	<------><------><------>res = res && !grep(buf, "not supported by FW") &&
	<------><------><------><------>!grep(buf, "unsupported function id");
	<------><------><------>break;
	<------><------>default:
	<------><------><------>break;
	<------><------>}
	<------>}

	<------>return res;
	}

	/*
	* Probe for availability of kernel commit (5.3):
	*
	* c04c0d2b968a ("bpf: increase complexity limit and maximum program size")
	*/
	bool bpf_probe_large_insn_limit(__u32 ifindex)
	{
	<------>struct bpf_insn insns[BPF_MAXINSNS + 1];
	<------>int i;

	<------>for (i = 0; i < BPF_MAXINSNS; i++)
	<------><------>insns[i] = BPF_MOV64_IMM(BPF_REG_0, 1);
	<------>insns[BPF_MAXINSNS] = BPF_EXIT_INSN();

	<------>errno = 0;
	<------>probe_load(BPF_PROG_TYPE_SCHED_CLS, insns, ARRAY_SIZE(insns), NULL, 0,
	<------><------> ifindex);

	<------>return errno != E2BIG && errno != EINVAL;
	}