basic: code cleanup

Signed-off-by: Hengqi Chen <chenhengqi@outlook.com>

Author: chenhengqi

basic01-xdp-pass/xdp_pass_user.c

@@ -162,7 +162,7 @@ int main(int argc, char **argv)
 	if (err)
 		return err;
 
-        /* This step is not really needed , BPF-info via bpf-syscall */
+	/* This step is not really needed , BPF-info via bpf-syscall */
 	err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
 	if (err) {
 		fprintf(stderr, "ERR: can't get prog info - %s\n",

basic03-map-counter/xdp_load_and_stats.c

@@ -67,7 +67,7 @@ int find_map_fd(struct bpf_object *bpf_obj, const char *mapname)
 
 	/* Lesson#3: bpf_object to bpf_map */
 	map = bpf_object__find_map_by_name(bpf_obj, mapname);
-        if (!map) {
+	if (!map) {
 		fprintf(stderr, "ERR: cannot find map by name: %s\n", mapname);
 		goto out;
 	}
@@ -85,7 +85,7 @@ static __u64 gettime(void)
 
 	res = clock_gettime(CLOCK_MONOTONIC, &t);
 	if (res < 0) {
-		fprintf(stderr, "Error with gettimeofday! (%i)\n", res);
+		fprintf(stderr, "Error with clock_gettime! (%i)\n", res);
 		exit(EXIT_FAIL);
 	}
 	return (__u64) t.tv_sec * NANOSEC_PER_SEC + t.tv_nsec;
@@ -131,7 +131,7 @@ static void stats_print(struct stats_record *stats_rec,
 
 		period = calc_period(rec, prev);
 		if (period == 0)
-		       return;
+			return;
 
 		packets = rec->total.rx_packets - prev->total.rx_packets;
 		pps     = packets / period;

basic04-pinning-maps/xdp_prog_kern.c

@@ -15,13 +15,6 @@ struct bpf_map_def SEC("maps") xdp_stats_map = {
 	.max_entries = XDP_ACTION_MAX,
 };
 
-/* LLVM maps __sync_fetch_and_add() as a built-in function to the BPF atomic add
- * instruction (that is BPF_STX | BPF_XADD | BPF_W for word sizes)
- */
-#ifndef lock_xadd
-#define lock_xadd(ptr, val)	((void) __sync_fetch_and_add(ptr, val))
-#endif
-
 static __always_inline
 __u32 xdp_stats_record_action(struct xdp_md *ctx, __u32 action)
 {

basic04-pinning-maps/xdp_stats.c

@@ -46,7 +46,7 @@ static __u64 gettime(void)
 
 	res = clock_gettime(CLOCK_MONOTONIC, &t);
 	if (res < 0) {
-		fprintf(stderr, "Error with gettimeofday! (%i)\n", res);
+		fprintf(stderr, "Error with clock_gettime! (%i)\n", res);
 		exit(EXIT_FAIL);
 	}
 	return (__u64) t.tv_sec * NANOSEC_PER_SEC + t.tv_nsec;