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Date:   Sat, 16 May 2020 13:06:08 +0900
From:   "Daniel T. Lee" <danieltimlee@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        John Fastabend <john.fastabend@...il.com>,
        Yonghong Song <yhs@...com>
Subject: [PATCH bpf-next v2 5/5] samples: bpf: refactor kprobe, tail call kern progs map definition

Because the previous two commit replaced the bpf_load implementation of
the user program with libbpf, the corresponding kernel program's MAP
definition can be replaced with new BTF-defined map syntax.

This commit only updates the samples which uses libbpf API for loading
bpf program not with bpf_load.

Signed-off-by: Daniel T. Lee <danieltimlee@...il.com>
---
 samples/bpf/sampleip_kern.c    | 12 +++++------
 samples/bpf/sockex3_kern.c     | 36 ++++++++++++++++----------------
 samples/bpf/trace_event_kern.c | 24 ++++++++++-----------
 samples/bpf/tracex2_kern.c     | 24 ++++++++++-----------
 samples/bpf/tracex3_kern.c     | 24 ++++++++++-----------
 samples/bpf/tracex4_kern.c     | 12 +++++------
 samples/bpf/tracex5_kern.c     | 14 ++++++-------
 samples/bpf/tracex6_kern.c     | 38 ++++++++++++++++++----------------
 8 files changed, 93 insertions(+), 91 deletions(-)

diff --git a/samples/bpf/sampleip_kern.c b/samples/bpf/sampleip_kern.c
index e504dc308371..f24806ac24e7 100644
--- a/samples/bpf/sampleip_kern.c
+++ b/samples/bpf/sampleip_kern.c
@@ -13,12 +13,12 @@
 
 #define MAX_IPS		8192
 
-struct bpf_map_def SEC("maps") ip_map = {
-	.type = BPF_MAP_TYPE_HASH,
-	.key_size = sizeof(u64),
-	.value_size = sizeof(u32),
-	.max_entries = MAX_IPS,
-};
+struct {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__type(key, u64);
+	__type(value, u32);
+	__uint(max_entries, MAX_IPS);
+} ip_map SEC(".maps");
 
 SEC("perf_event")
 int do_sample(struct bpf_perf_event_data *ctx)
diff --git a/samples/bpf/sockex3_kern.c b/samples/bpf/sockex3_kern.c
index 779a5249c418..cab9cca0b8eb 100644
--- a/samples/bpf/sockex3_kern.c
+++ b/samples/bpf/sockex3_kern.c
@@ -19,12 +19,12 @@
 
 #define PROG(F) SEC("socket/"__stringify(F)) int bpf_func_##F
 
-struct bpf_map_def SEC("maps") jmp_table = {
-	.type = BPF_MAP_TYPE_PROG_ARRAY,
-	.key_size = sizeof(u32),
-	.value_size = sizeof(u32),
-	.max_entries = 8,
-};
+struct {
+	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
+	__uint(key_size, sizeof(u32));
+	__uint(value_size, sizeof(u32));
+	__uint(max_entries, 8);
+} jmp_table SEC(".maps");
 
 #define PARSE_VLAN 1
 #define PARSE_MPLS 2
@@ -92,12 +92,12 @@ struct globals {
 	struct flow_key_record flow;
 };
 
-struct bpf_map_def SEC("maps") percpu_map = {
-	.type = BPF_MAP_TYPE_ARRAY,
-	.key_size = sizeof(__u32),
-	.value_size = sizeof(struct globals),
-	.max_entries = 32,
-};
+struct {
+	__uint(type, BPF_MAP_TYPE_ARRAY);
+	__type(key, __u32);
+	__type(value, struct globals);
+	__uint(max_entries, 32);
+} percpu_map SEC(".maps");
 
 /* user poor man's per_cpu until native support is ready */
 static struct globals *this_cpu_globals(void)
@@ -113,12 +113,12 @@ struct pair {
 	__u64 bytes;
 };
 
-struct bpf_map_def SEC("maps") hash_map = {
-	.type = BPF_MAP_TYPE_HASH,
-	.key_size = sizeof(struct flow_key_record),
-	.value_size = sizeof(struct pair),
-	.max_entries = 1024,
-};
+struct {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__type(key, struct flow_key_record);
+	__type(value, struct pair);
+	__uint(max_entries, 1024);
+} hash_map SEC(".maps");
 
 static void update_stats(struct __sk_buff *skb, struct globals *g)
 {
diff --git a/samples/bpf/trace_event_kern.c b/samples/bpf/trace_event_kern.c
index da1d69e20645..7d3c66fb3f88 100644
--- a/samples/bpf/trace_event_kern.c
+++ b/samples/bpf/trace_event_kern.c
@@ -18,19 +18,19 @@ struct key_t {
 	u32 userstack;
 };
 
-struct bpf_map_def SEC("maps") counts = {
-	.type = BPF_MAP_TYPE_HASH,
-	.key_size = sizeof(struct key_t),
-	.value_size = sizeof(u64),
-	.max_entries = 10000,
-};
+struct {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__type(key, struct key_t);
+	__type(value, u64);
+	__uint(max_entries, 10000);
+} counts SEC(".maps");
 
-struct bpf_map_def SEC("maps") stackmap = {
-	.type = BPF_MAP_TYPE_STACK_TRACE,
-	.key_size = sizeof(u32),
-	.value_size = PERF_MAX_STACK_DEPTH * sizeof(u64),
-	.max_entries = 10000,
-};
+struct {
+	__uint(type, BPF_MAP_TYPE_STACK_TRACE);
+	__uint(key_size, sizeof(u32));
+	__uint(value_size, PERF_MAX_STACK_DEPTH * sizeof(u64));
+	__uint(max_entries, 10000);
+} stackmap SEC(".maps");
 
 #define KERN_STACKID_FLAGS (0 | BPF_F_FAST_STACK_CMP)
 #define USER_STACKID_FLAGS (0 | BPF_F_FAST_STACK_CMP | BPF_F_USER_STACK)
diff --git a/samples/bpf/tracex2_kern.c b/samples/bpf/tracex2_kern.c
index cc5f94c098f8..5bc696bac27d 100644
--- a/samples/bpf/tracex2_kern.c
+++ b/samples/bpf/tracex2_kern.c
@@ -12,12 +12,12 @@
 #include <bpf/bpf_tracing.h>
 #include "trace_common.h"
 
-struct bpf_map_def SEC("maps") my_map = {
-	.type = BPF_MAP_TYPE_HASH,
-	.key_size = sizeof(long),
-	.value_size = sizeof(long),
-	.max_entries = 1024,
-};
+struct {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__type(key, long);
+	__type(value, long);
+	__uint(max_entries, 1024);
+} my_map SEC(".maps");
 
 /* kprobe is NOT a stable ABI. If kernel internals change this bpf+kprobe
  * example will no longer be meaningful
@@ -71,12 +71,12 @@ struct hist_key {
 	u64 index;
 };
 
-struct bpf_map_def SEC("maps") my_hist_map = {
-	.type = BPF_MAP_TYPE_PERCPU_HASH,
-	.key_size = sizeof(struct hist_key),
-	.value_size = sizeof(long),
-	.max_entries = 1024,
-};
+struct {
+	__uint(type, BPF_MAP_TYPE_PERCPU_HASH);
+	__uint(key_size, sizeof(struct hist_key));
+	__uint(value_size, sizeof(long));
+	__uint(max_entries, 1024);
+} my_hist_map SEC(".maps");
 
 SEC("kprobe/" SYSCALL(sys_write))
 int bpf_prog3(struct pt_regs *ctx)
diff --git a/samples/bpf/tracex3_kern.c b/samples/bpf/tracex3_kern.c
index fe21c14feb8d..659613c19a82 100644
--- a/samples/bpf/tracex3_kern.c
+++ b/samples/bpf/tracex3_kern.c
@@ -11,12 +11,12 @@
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 
-struct bpf_map_def SEC("maps") my_map = {
-	.type = BPF_MAP_TYPE_HASH,
-	.key_size = sizeof(long),
-	.value_size = sizeof(u64),
-	.max_entries = 4096,
-};
+struct {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__type(key, long);
+	__type(value, u64);
+	__uint(max_entries, 4096);
+} my_map SEC(".maps");
 
 /* kprobe is NOT a stable ABI. If kernel internals change this bpf+kprobe
  * example will no longer be meaningful
@@ -42,12 +42,12 @@ static unsigned int log2l(unsigned long long n)
 
 #define SLOTS 100
 
-struct bpf_map_def SEC("maps") lat_map = {
-	.type = BPF_MAP_TYPE_PERCPU_ARRAY,
-	.key_size = sizeof(u32),
-	.value_size = sizeof(u64),
-	.max_entries = SLOTS,
-};
+struct {
+	__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
+	__uint(key_size, sizeof(u32));
+	__uint(value_size, sizeof(u64));
+	__uint(max_entries, SLOTS);
+} lat_map SEC(".maps");
 
 SEC("kprobe/blk_account_io_completion")
 int bpf_prog2(struct pt_regs *ctx)
diff --git a/samples/bpf/tracex4_kern.c b/samples/bpf/tracex4_kern.c
index b1bb9df88f8e..eb0f8fdd14bf 100644
--- a/samples/bpf/tracex4_kern.c
+++ b/samples/bpf/tracex4_kern.c
@@ -15,12 +15,12 @@ struct pair {
 	u64 ip;
 };
 
-struct bpf_map_def SEC("maps") my_map = {
-	.type = BPF_MAP_TYPE_HASH,
-	.key_size = sizeof(long),
-	.value_size = sizeof(struct pair),
-	.max_entries = 1000000,
-};
+struct {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__type(key, long);
+	__type(value, struct pair);
+	__uint(max_entries, 1000000);
+} my_map SEC(".maps");
 
 /* kprobe is NOT a stable ABI. If kernel internals change this bpf+kprobe
  * example will no longer be meaningful
diff --git a/samples/bpf/tracex5_kern.c b/samples/bpf/tracex5_kern.c
index 481790fde864..32b49e8ab6bd 100644
--- a/samples/bpf/tracex5_kern.c
+++ b/samples/bpf/tracex5_kern.c
@@ -15,16 +15,16 @@
 
 #define PROG(F) SEC("kprobe/"__stringify(F)) int bpf_func_##F
 
-struct bpf_map_def SEC("maps") progs = {
-	.type = BPF_MAP_TYPE_PROG_ARRAY,
-	.key_size = sizeof(u32),
-	.value_size = sizeof(u32),
+struct {
+	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
+	__uint(key_size, sizeof(u32));
+	__uint(value_size, sizeof(u32));
 #ifdef __mips__
-	.max_entries = 6000, /* MIPS n64 syscalls start at 5000 */
+	__uint(max_entries, 6000); /* MIPS n64 syscalls start at 5000 */
 #else
-	.max_entries = 1024,
+	__uint(max_entries, 1024);
 #endif
-};
+} progs SEC(".maps");
 
 SEC("kprobe/__seccomp_filter")
 int bpf_prog1(struct pt_regs *ctx)
diff --git a/samples/bpf/tracex6_kern.c b/samples/bpf/tracex6_kern.c
index 96c234efa852..acad5712d8b4 100644
--- a/samples/bpf/tracex6_kern.c
+++ b/samples/bpf/tracex6_kern.c
@@ -3,24 +3,26 @@
 #include <uapi/linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 
-struct bpf_map_def SEC("maps") counters = {
-	.type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
-	.key_size = sizeof(int),
-	.value_size = sizeof(u32),
-	.max_entries = 64,
-};
-struct bpf_map_def SEC("maps") values = {
-	.type = BPF_MAP_TYPE_HASH,
-	.key_size = sizeof(int),
-	.value_size = sizeof(u64),
-	.max_entries = 64,
-};
-struct bpf_map_def SEC("maps") values2 = {
-	.type = BPF_MAP_TYPE_HASH,
-	.key_size = sizeof(int),
-	.value_size = sizeof(struct bpf_perf_event_value),
-	.max_entries = 64,
-};
+struct {
+	__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
+	__uint(key_size, sizeof(int));
+	__uint(value_size, sizeof(u32));
+	__uint(max_entries, 64);
+} counters SEC(".maps");
+
+struct {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__type(key, int);
+	__type(value, u64);
+	__uint(max_entries, 64);
+} values SEC(".maps");
+
+struct {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__type(key, int);
+	__type(value, struct bpf_perf_event_value);
+	__uint(max_entries, 64);
+} values2 SEC(".maps");
 
 SEC("kprobe/htab_map_get_next_key")
 int bpf_prog1(struct pt_regs *ctx)
-- 
2.25.1

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