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bpf: add selftest for lirc_mode2 type program

Browse source 
This is simple test over rc-loopback.

Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Sean Young 2018-05-27 12:24:10 +01:00 committed by Daniel Borkmann
parent f4364dcfc8
commit 6bdd533cee
10 changed files with 494 additions and 17 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
tools/bpf/bpftool/prog.c
View file

@ -71,6 +71,7 @@ static const char * const prog_type_name[] = {
[BPF_PROG_TYPE_SK_MSG] = "sk_msg",
[BPF_PROG_TYPE_RAW_TRACEPOINT] = "raw_tracepoint",
[BPF_PROG_TYPE_CGROUP_SOCK_ADDR] = "cgroup_sock_addr",
[BPF_PROG_TYPE_LIRC_MODE2] = "lirc_mode2",
};
static void print_boot_time(__u64 nsecs, char *buf, unsigned int size)

79
tools/include/uapi/linux/bpf.h
View file

@ -143,6 +143,7 @@ enum bpf_prog_type {
BPF_PROG_TYPE_RAW_TRACEPOINT,
BPF_PROG_TYPE_CGROUP_SOCK_ADDR,
BPF_PROG_TYPE_LWT_SEG6LOCAL,
BPF_PROG_TYPE_LIRC_MODE2,
};
enum bpf_attach_type {
@ -162,6 +163,7 @@ enum bpf_attach_type {
BPF_CGROUP_INET6_POST_BIND,
BPF_CGROUP_UDP4_SENDMSG,
BPF_CGROUP_UDP6_SENDMSG,
BPF_LIRC_MODE2,
__MAX_BPF_ATTACH_TYPE
};
@ -1852,10 +1854,10 @@ union bpf_attr {
* If lookup is successful and result shows packet is to be
* forwarded, the neighbor tables are searched for the nexthop.
* If successful (ie., FIB lookup shows forwarding and nexthop
* is resolved), the nexthop address is returned in ipv4_dst,
* ipv6_dst or mpls_out based on family, smac is set to mac
* address of egress device, dmac is set to nexthop mac address,
* rt_metric is set to metric from route.
* is resolved), the nexthop address is returned in ipv4_dst
* or ipv6_dst based on family, smac is set to mac address of
* egress device, dmac is set to nexthop mac address, rt_metric
* is set to metric from route (IPv4/IPv6 only).
*
* *plen* argument is the size of the passed in struct.
* *flags* argument can be a combination of one or more of the
@ -2005,6 +2007,53 @@ union bpf_attr {
* direct packet access.
* Return
* 0 on success, or a negative error in case of failure.
*
* int bpf_rc_keydown(void *ctx, u32 protocol, u64 scancode, u32 toggle)
* Description
* This helper is used in programs implementing IR decoding, to
* report a successfully decoded key press with *scancode*,
* *toggle* value in the given *protocol*. The scancode will be
* translated to a keycode using the rc keymap, and reported as
* an input key down event. After a period a key up event is
* generated. This period can be extended by calling either
* **bpf_rc_keydown** () again with the same values, or calling
* **bpf_rc_repeat** ().
*
* Some protocols include a toggle bit, in case the button was
* released and pressed again between consecutive scancodes.
*
* The *ctx* should point to the lirc sample as passed into
* the program.
*
* The *protocol* is the decoded protocol number (see
* **enum rc_proto** for some predefined values).
*
* This helper is only available is the kernel was compiled with
* the **CONFIG_BPF_LIRC_MODE2** configuration option set to
* "**y**".
*
* Return
* 0
*
* int bpf_rc_repeat(void *ctx)
* Description
* This helper is used in programs implementing IR decoding, to
* report a successfully decoded repeat key message. This delays
* the generation of a key up event for previously generated
* key down event.
*
* Some IR protocols like NEC have a special IR message for
* repeating last button, for when a button is held down.
*
* The *ctx* should point to the lirc sample as passed into
* the program.
*
* This helper is only available is the kernel was compiled with
* the **CONFIG_BPF_LIRC_MODE2** configuration option set to
* "**y**".
*
* Return
* 0
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@ -2083,7 +2132,9 @@ union bpf_attr {
FN(lwt_push_encap), \
FN(lwt_seg6_store_bytes), \
FN(lwt_seg6_adjust_srh), \
FN(lwt_seg6_action),
FN(lwt_seg6_action), \
FN(rc_repeat), \
FN(rc_keydown),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call
@ -2537,8 +2588,10 @@ struct bpf_raw_tracepoint_args {
#define BPF_FIB_LOOKUP_OUTPUT BIT(1)
struct bpf_fib_lookup {
/* input */
__u8 family; /* network family, AF_INET, AF_INET6, AF_MPLS */
/* input: network family for lookup (AF_INET, AF_INET6)
* output: network family of egress nexthop
*/
__u8 family;
/* set if lookup is to consider L4 data - e.g., FIB rules */
__u8 l4_protocol;
@ -2554,22 +2607,20 @@ struct bpf_fib_lookup {
__u8 tos; /* AF_INET */
__be32 flowlabel; /* AF_INET6 */
/* output: metric of fib result */
__u32 rt_metric;
/* output: metric of fib result (IPv4/IPv6 only) */
__u32 rt_metric;
};
union {
__be32 mpls_in;
__be32 ipv4_src;
__u32 ipv6_src[4]; /* in6_addr; network order */
};
/* input to bpf_fib_lookup, *dst is destination address.
* output: bpf_fib_lookup sets to gateway address
/* input to bpf_fib_lookup, ipv{4,6}_dst is destination address in
* network header. output: bpf_fib_lookup sets to gateway address
* if FIB lookup returns gateway route
*/
union {
/* return for MPLS lookups */
__be32 mpls_out[4]; /* support up to 4 labels */
__be32 ipv4_dst;
__u32 ipv6_dst[4]; /* in6_addr; network order */
};

217
tools/include/uapi/linux/lirc.h Normal file
View file

@ -0,0 +1,217 @@
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* lirc.h - linux infrared remote control header file
* last modified 2010/07/13 by Jarod Wilson
*/
#ifndef _LINUX_LIRC_H
#define _LINUX_LIRC_H
#include <linux/types.h>
#include <linux/ioctl.h>
#define PULSE_BIT 0x01000000
#define PULSE_MASK 0x00FFFFFF
#define LIRC_MODE2_SPACE 0x00000000
#define LIRC_MODE2_PULSE 0x01000000
#define LIRC_MODE2_FREQUENCY 0x02000000
#define LIRC_MODE2_TIMEOUT 0x03000000
#define LIRC_VALUE_MASK 0x00FFFFFF
#define LIRC_MODE2_MASK 0xFF000000
#define LIRC_SPACE(val) (((val)&LIRC_VALUE_MASK) | LIRC_MODE2_SPACE)
#define LIRC_PULSE(val) (((val)&LIRC_VALUE_MASK) | LIRC_MODE2_PULSE)
#define LIRC_FREQUENCY(val) (((val)&LIRC_VALUE_MASK) | LIRC_MODE2_FREQUENCY)
#define LIRC_TIMEOUT(val) (((val)&LIRC_VALUE_MASK) | LIRC_MODE2_TIMEOUT)
#define LIRC_VALUE(val) ((val)&LIRC_VALUE_MASK)
#define LIRC_MODE2(val) ((val)&LIRC_MODE2_MASK)
#define LIRC_IS_SPACE(val) (LIRC_MODE2(val) == LIRC_MODE2_SPACE)
#define LIRC_IS_PULSE(val) (LIRC_MODE2(val) == LIRC_MODE2_PULSE)
#define LIRC_IS_FREQUENCY(val) (LIRC_MODE2(val) == LIRC_MODE2_FREQUENCY)
#define LIRC_IS_TIMEOUT(val) (LIRC_MODE2(val) == LIRC_MODE2_TIMEOUT)
/* used heavily by lirc userspace */
#define lirc_t int
/*** lirc compatible hardware features ***/
#define LIRC_MODE2SEND(x) (x)
#define LIRC_SEND2MODE(x) (x)
#define LIRC_MODE2REC(x) ((x) << 16)
#define LIRC_REC2MODE(x) ((x) >> 16)
#define LIRC_MODE_RAW 0x00000001
#define LIRC_MODE_PULSE 0x00000002
#define LIRC_MODE_MODE2 0x00000004
#define LIRC_MODE_SCANCODE 0x00000008
#define LIRC_MODE_LIRCCODE 0x00000010
#define LIRC_CAN_SEND_RAW LIRC_MODE2SEND(LIRC_MODE_RAW)
#define LIRC_CAN_SEND_PULSE LIRC_MODE2SEND(LIRC_MODE_PULSE)
#define LIRC_CAN_SEND_MODE2 LIRC_MODE2SEND(LIRC_MODE_MODE2)
#define LIRC_CAN_SEND_LIRCCODE LIRC_MODE2SEND(LIRC_MODE_LIRCCODE)
#define LIRC_CAN_SEND_MASK 0x0000003f
#define LIRC_CAN_SET_SEND_CARRIER 0x00000100
#define LIRC_CAN_SET_SEND_DUTY_CYCLE 0x00000200
#define LIRC_CAN_SET_TRANSMITTER_MASK 0x00000400
#define LIRC_CAN_REC_RAW LIRC_MODE2REC(LIRC_MODE_RAW)
#define LIRC_CAN_REC_PULSE LIRC_MODE2REC(LIRC_MODE_PULSE)
#define LIRC_CAN_REC_MODE2 LIRC_MODE2REC(LIRC_MODE_MODE2)
#define LIRC_CAN_REC_SCANCODE LIRC_MODE2REC(LIRC_MODE_SCANCODE)
#define LIRC_CAN_REC_LIRCCODE LIRC_MODE2REC(LIRC_MODE_LIRCCODE)
#define LIRC_CAN_REC_MASK LIRC_MODE2REC(LIRC_CAN_SEND_MASK)
#define LIRC_CAN_SET_REC_CARRIER (LIRC_CAN_SET_SEND_CARRIER << 16)
#define LIRC_CAN_SET_REC_DUTY_CYCLE (LIRC_CAN_SET_SEND_DUTY_CYCLE << 16)
#define LIRC_CAN_SET_REC_DUTY_CYCLE_RANGE 0x40000000
#define LIRC_CAN_SET_REC_CARRIER_RANGE 0x80000000
#define LIRC_CAN_GET_REC_RESOLUTION 0x20000000
#define LIRC_CAN_SET_REC_TIMEOUT 0x10000000
#define LIRC_CAN_SET_REC_FILTER 0x08000000
#define LIRC_CAN_MEASURE_CARRIER 0x02000000
#define LIRC_CAN_USE_WIDEBAND_RECEIVER 0x04000000
#define LIRC_CAN_SEND(x) ((x)&LIRC_CAN_SEND_MASK)
#define LIRC_CAN_REC(x) ((x)&LIRC_CAN_REC_MASK)
#define LIRC_CAN_NOTIFY_DECODE 0x01000000
/*** IOCTL commands for lirc driver ***/
#define LIRC_GET_FEATURES _IOR('i', 0x00000000, __u32)
#define LIRC_GET_SEND_MODE _IOR('i', 0x00000001, __u32)
#define LIRC_GET_REC_MODE _IOR('i', 0x00000002, __u32)
#define LIRC_GET_REC_RESOLUTION _IOR('i', 0x00000007, __u32)
#define LIRC_GET_MIN_TIMEOUT _IOR('i', 0x00000008, __u32)
#define LIRC_GET_MAX_TIMEOUT _IOR('i', 0x00000009, __u32)
/* code length in bits, currently only for LIRC_MODE_LIRCCODE */
#define LIRC_GET_LENGTH _IOR('i', 0x0000000f, __u32)
#define LIRC_SET_SEND_MODE _IOW('i', 0x00000011, __u32)
#define LIRC_SET_REC_MODE _IOW('i', 0x00000012, __u32)
/* Note: these can reset the according pulse_width */
#define LIRC_SET_SEND_CARRIER _IOW('i', 0x00000013, __u32)
#define LIRC_SET_REC_CARRIER _IOW('i', 0x00000014, __u32)
#define LIRC_SET_SEND_DUTY_CYCLE _IOW('i', 0x00000015, __u32)
#define LIRC_SET_TRANSMITTER_MASK _IOW('i', 0x00000017, __u32)
/*
* when a timeout != 0 is set the driver will send a
* LIRC_MODE2_TIMEOUT data packet, otherwise LIRC_MODE2_TIMEOUT is
* never sent, timeout is disabled by default
*/
#define LIRC_SET_REC_TIMEOUT _IOW('i', 0x00000018, __u32)
/* 1 enables, 0 disables timeout reports in MODE2 */
#define LIRC_SET_REC_TIMEOUT_REPORTS _IOW('i', 0x00000019, __u32)
/*
* if enabled from the next key press on the driver will send
* LIRC_MODE2_FREQUENCY packets
*/
#define LIRC_SET_MEASURE_CARRIER_MODE _IOW('i', 0x0000001d, __u32)
/*
* to set a range use LIRC_SET_REC_CARRIER_RANGE with the
* lower bound first and later LIRC_SET_REC_CARRIER with the upper bound
*/
#define LIRC_SET_REC_CARRIER_RANGE _IOW('i', 0x0000001f, __u32)
#define LIRC_SET_WIDEBAND_RECEIVER _IOW('i', 0x00000023, __u32)
/*
* struct lirc_scancode - decoded scancode with protocol for use with
* LIRC_MODE_SCANCODE
*
* @timestamp: Timestamp in nanoseconds using CLOCK_MONOTONIC when IR
* was decoded.
* @flags: should be 0 for transmit. When receiving scancodes,
* LIRC_SCANCODE_FLAG_TOGGLE or LIRC_SCANCODE_FLAG_REPEAT can be set
* depending on the protocol
* @rc_proto: see enum rc_proto
* @keycode: the translated keycode. Set to 0 for transmit.
* @scancode: the scancode received or to be sent
*/
struct lirc_scancode {
__u64 timestamp;
__u16 flags;
__u16 rc_proto;
__u32 keycode;
__u64 scancode;
};
/* Set if the toggle bit of rc-5 or rc-6 is enabled */
#define LIRC_SCANCODE_FLAG_TOGGLE 1
/* Set if this is a nec or sanyo repeat */
#define LIRC_SCANCODE_FLAG_REPEAT 2
/**
* enum rc_proto - the Remote Controller protocol
*
* @RC_PROTO_UNKNOWN: Protocol not known
* @RC_PROTO_OTHER: Protocol known but proprietary
* @RC_PROTO_RC5: Philips RC5 protocol
* @RC_PROTO_RC5X_20: Philips RC5x 20 bit protocol
* @RC_PROTO_RC5_SZ: StreamZap variant of RC5
* @RC_PROTO_JVC: JVC protocol
* @RC_PROTO_SONY12: Sony 12 bit protocol
* @RC_PROTO_SONY15: Sony 15 bit protocol
* @RC_PROTO_SONY20: Sony 20 bit protocol
* @RC_PROTO_NEC: NEC protocol
* @RC_PROTO_NECX: Extended NEC protocol
* @RC_PROTO_NEC32: NEC 32 bit protocol
* @RC_PROTO_SANYO: Sanyo protocol
* @RC_PROTO_MCIR2_KBD: RC6-ish MCE keyboard
* @RC_PROTO_MCIR2_MSE: RC6-ish MCE mouse
* @RC_PROTO_RC6_0: Philips RC6-0-16 protocol
* @RC_PROTO_RC6_6A_20: Philips RC6-6A-20 protocol
* @RC_PROTO_RC6_6A_24: Philips RC6-6A-24 protocol
* @RC_PROTO_RC6_6A_32: Philips RC6-6A-32 protocol
* @RC_PROTO_RC6_MCE: MCE (Philips RC6-6A-32 subtype) protocol
* @RC_PROTO_SHARP: Sharp protocol
* @RC_PROTO_XMP: XMP protocol
* @RC_PROTO_CEC: CEC protocol
* @RC_PROTO_IMON: iMon Pad protocol
*/
enum rc_proto {
RC_PROTO_UNKNOWN = 0,
RC_PROTO_OTHER = 1,
RC_PROTO_RC5 = 2,
RC_PROTO_RC5X_20 = 3,
RC_PROTO_RC5_SZ = 4,
RC_PROTO_JVC = 5,
RC_PROTO_SONY12 = 6,
RC_PROTO_SONY15 = 7,
RC_PROTO_SONY20 = 8,
RC_PROTO_NEC = 9,
RC_PROTO_NECX = 10,
RC_PROTO_NEC32 = 11,
RC_PROTO_SANYO = 12,
RC_PROTO_MCIR2_KBD = 13,
RC_PROTO_MCIR2_MSE = 14,
RC_PROTO_RC6_0 = 15,
RC_PROTO_RC6_6A_20 = 16,
RC_PROTO_RC6_6A_24 = 17,
RC_PROTO_RC6_6A_32 = 18,
RC_PROTO_RC6_MCE = 19,
RC_PROTO_SHARP = 20,
RC_PROTO_XMP = 21,
RC_PROTO_CEC = 22,
RC_PROTO_IMON = 23,
};
#endif

1
tools/lib/bpf/libbpf.c
View file

@ -1462,6 +1462,7 @@ static bool bpf_prog_type__needs_kver(enum bpf_prog_type type)
case BPF_PROG_TYPE_CGROUP_DEVICE:
case BPF_PROG_TYPE_SK_MSG:
case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
case BPF_PROG_TYPE_LIRC_MODE2:
return false;
case BPF_PROG_TYPE_UNSPEC:
case BPF_PROG_TYPE_KPROBE:

1
tools/testing/selftests/bpf/.gitignore vendored
View file

@ -17,3 +17,4 @@ test_sock_addr
urandom_read
test_btf
test_sockmap
test_lirc_mode2_user

7
tools/testing/selftests/bpf/Makefile
View file

@ -24,7 +24,7 @@ urandom_read: urandom_read.c
# Order correspond to 'make run_tests' order
TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \
test_align test_verifier_log test_dev_cgroup test_tcpbpf_user \
test_sock test_btf test_sockmap
test_sock test_btf test_sockmap test_lirc_mode2_user
TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test_obj_id.o \
test_pkt_md_access.o test_xdp_redirect.o test_xdp_meta.o sockmap_parse_prog.o \
@ -34,7 +34,7 @@ TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test
sockmap_tcp_msg_prog.o connect4_prog.o connect6_prog.o test_adjust_tail.o \
test_btf_haskv.o test_btf_nokv.o test_sockmap_kern.o test_tunnel_kern.o \
test_get_stack_rawtp.o test_sockmap_kern.o test_sockhash_kern.o \
test_lwt_seg6local.o sendmsg4_prog.o sendmsg6_prog.o
test_lwt_seg6local.o sendmsg4_prog.o sendmsg6_prog.o test_lirc_mode2_kern.o
# Order correspond to 'make run_tests' order
TEST_PROGS := test_kmod.sh \
@ -44,7 +44,8 @@ TEST_PROGS := test_kmod.sh \
test_offload.py \
test_sock_addr.sh \
test_tunnel.sh \
test_lwt_seg6local.sh
test_lwt_seg6local.sh \
test_lirc_mode2.sh
# Compile but not part of 'make run_tests'
TEST_GEN_PROGS_EXTENDED = test_libbpf_open test_sock_addr

5
tools/testing/selftests/bpf/bpf_helpers.h
View file

@ -126,6 +126,11 @@ static int (*bpf_lwt_seg6_action)(void *ctx, unsigned int action, void *param,
static int (*bpf_lwt_seg6_adjust_srh)(void *ctx, unsigned int offset,
unsigned int len) =
(void *) BPF_FUNC_lwt_seg6_adjust_srh;
static int (*bpf_rc_repeat)(void *ctx) =
(void *) BPF_FUNC_rc_repeat;
static int (*bpf_rc_keydown)(void *ctx, unsigned int protocol,
unsigned long long scancode, unsigned int toggle) =
(void *) BPF_FUNC_rc_keydown;
/* llvm builtin functions that eBPF C program may use to
* emit BPF_LD_ABS and BPF_LD_IND instructions

28
tools/testing/selftests/bpf/test_lirc_mode2.sh Executable file
View file

@ -0,0 +1,28 @@
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
GREEN='\033[0;92m'
RED='\033[0;31m'
NC='\033[0m' # No Color
modprobe rc-loopback
for i in /sys/class/rc/rc*
do
if grep -q DRV_NAME=rc-loopback $i/uevent
then
LIRCDEV=$(grep DEVNAME= $i/lirc*/uevent | sed sQDEVNAME=Q/dev/Q)
fi
done
if [ -n $LIRCDEV ];
then
TYPE=lirc_mode2
./test_lirc_mode2_user $LIRCDEV
ret=$?
if [ $ret -ne 0 ]; then
echo -e ${RED}"FAIL: $TYPE"${NC}
else
echo -e ${GREEN}"PASS: $TYPE"${NC}
fi
fi

23
tools/testing/selftests/bpf/test_lirc_mode2_kern.c Normal file
View file

@ -0,0 +1,23 @@
// SPDX-License-Identifier: GPL-2.0
// test ir decoder
//
// Copyright (C) 2018 Sean Young <sean@mess.org>
#include <linux/bpf.h>
#include <linux/lirc.h>
#include "bpf_helpers.h"
SEC("lirc_mode2")
int bpf_decoder(unsigned int *sample)
{
if (LIRC_IS_PULSE(*sample)) {
unsigned int duration = LIRC_VALUE(*sample);
if (duration & 0x10000)
bpf_rc_keydown(sample, 0x40, duration & 0xffff, 0);
}
return 0;
}
char _license[] SEC("license") = "GPL";

149
tools/testing/selftests/bpf/test_lirc_mode2_user.c Normal file
View file

@ -0,0 +1,149 @@
// SPDX-License-Identifier: GPL-2.0
// test ir decoder
//
// Copyright (C) 2018 Sean Young <sean@mess.org>
// A lirc chardev is a device representing a consumer IR (cir) device which
// can receive infrared signals from remote control and/or transmit IR.
//
// IR is sent as a series of pulses and space somewhat like morse code. The
// BPF program can decode this into scancodes so that rc-core can translate
// this into input key codes using the rc keymap.
//
// This test works by sending IR over rc-loopback, so the IR is processed by
// BPF and then decoded into scancodes. The lirc chardev must be the one
// associated with rc-loopback, see the output of ir-keytable(1).
//
// The following CONFIG options must be enabled for the test to succeed:
// CONFIG_RC_CORE=y
// CONFIG_BPF_RAWIR_EVENT=y
// CONFIG_RC_LOOPBACK=y
// Steps:
// 1. Open the /dev/lircN device for rc-loopback (given on command line)
// 2. Attach bpf_lirc_mode2 program which decodes some IR.
// 3. Send some IR to the same IR device; since it is loopback, this will
// end up in the bpf program
// 4. bpf program should decode IR and report keycode
// 5. We can read keycode from same /dev/lirc device
#include <linux/bpf.h>
#include <linux/lirc.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <poll.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "bpf_util.h"
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
int main(int argc, char **argv)
{
struct bpf_object *obj;
int ret, lircfd, progfd, mode;
int testir = 0x1dead;
u32 prog_ids[10], prog_flags[10], prog_cnt;
if (argc != 2) {
printf("Usage: %s /dev/lircN\n", argv[0]);
return 2;
}
ret = bpf_prog_load("test_lirc_mode2_kern.o",
BPF_PROG_TYPE_LIRC_MODE2, &obj, &progfd);
if (ret) {
printf("Failed to load bpf program\n");
return 1;
}
lircfd = open(argv[1], O_RDWR | O_NONBLOCK);
if (lircfd == -1) {
printf("failed to open lirc device %s: %m\n", argv[1]);
return 1;
}
/* Let's try detach it before it was ever attached */
ret = bpf_prog_detach2(progfd, lircfd, BPF_LIRC_MODE2);
if (ret != -1 || errno != ENOENT) {
printf("bpf_prog_detach2 not attached should fail: %m\n");
return 1;
}
mode = LIRC_MODE_SCANCODE;
if (ioctl(lircfd, LIRC_SET_REC_MODE, &mode)) {
printf("failed to set rec mode: %m\n");
return 1;
}
prog_cnt = 10;
ret = bpf_prog_query(lircfd, BPF_LIRC_MODE2, 0, prog_flags, prog_ids,
&prog_cnt);
if (ret) {
printf("Failed to query bpf programs on lirc device: %m\n");
return 1;
}
if (prog_cnt != 0) {
printf("Expected nothing to be attached\n");
return 1;
}
ret = bpf_prog_attach(progfd, lircfd, BPF_LIRC_MODE2, 0);
if (ret) {
printf("Failed to attach bpf to lirc device: %m\n");
return 1;
}
/* Write raw IR */
ret = write(lircfd, &testir, sizeof(testir));
if (ret != sizeof(testir)) {
printf("Failed to send test IR message: %m\n");
return 1;
}
struct pollfd pfd = { .fd = lircfd, .events = POLLIN };
struct lirc_scancode lsc;
poll(&pfd, 1, 100);
/* Read decoded IR */
ret = read(lircfd, &lsc, sizeof(lsc));
if (ret != sizeof(lsc)) {
printf("Failed to read decoded IR: %m\n");
return 1;
}
if (lsc.scancode != 0xdead || lsc.rc_proto != 64) {
printf("Incorrect scancode decoded\n");
return 1;
}
prog_cnt = 10;
ret = bpf_prog_query(lircfd, BPF_LIRC_MODE2, 0, prog_flags, prog_ids,
&prog_cnt);
if (ret) {
printf("Failed to query bpf programs on lirc device: %m\n");
return 1;
}
if (prog_cnt != 1) {
printf("Expected one program to be attached\n");
return 1;
}
/* Let's try detaching it now it is actually attached */
ret = bpf_prog_detach2(progfd, lircfd, BPF_LIRC_MODE2);
if (ret) {
printf("bpf_prog_detach2: returned %m\n");
return 1;
}
return 0;
}