selftests/bpf: Prepare to add -Wsign-compare for bpf tests

-Change only variable types for correct sign comparisons

Signed-off-by: Mehdi Ben Hadj Khelifa <[email protected]>

Author: Mehdibenhadjkhelifa

tools/testing/selftests/bpf/progs/test_parse_tcp_hdr_opt_dynptr.c

@@ -100,7 +100,7 @@ int xdp_ingress_v6(struct xdp_md *xdp)
 	off += sizeof(struct tcphdr);
 
 	/* max number of bytes of options in tcp header is 40 bytes */
-	for (int i = 0; i < tcp_hdr_opt_max_opt_checks; i++) {
+	for (__u32 i = 0; i < tcp_hdr_opt_max_opt_checks; i++) {
 		err = parse_hdr_opt(&ptr, &off, &hdr_bytes_remaining, &server_id);
 
 		if (err || !hdr_bytes_remaining)

tools/testing/selftests/bpf/progs/test_skb_ctx.c

@@ -11,7 +11,7 @@ SEC("tc")
 int process(struct __sk_buff *skb)
 {
 	__pragma_loop_unroll_full
-	for (int i = 0; i < 5; i++) {
+	for (__u32 i = 0; i < 5; i++) {
 		if (skb->cb[i] != i + 1)
 			return 1;
 		skb->cb[i]++;

tools/testing/selftests/bpf/progs/test_snprintf.c

@@ -4,7 +4,7 @@
 #include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 
-__u32 pid = 0;
+int pid = 0;
 
 char num_out[64] = {};
 long num_ret = 0;

tools/testing/selftests/bpf/progs/test_sockmap_strp.c

@@ -2,7 +2,7 @@
 #include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_endian.h>
-int verdict_max_size = 10000;
+__u32 verdict_max_size = 10000;
 struct {
 	__uint(type, BPF_MAP_TYPE_SOCKMAP);
 	__uint(max_entries, 20);

tools/testing/selftests/bpf/progs/test_tc_tunnel.c

@@ -80,7 +80,7 @@ static __always_inline void set_ipv4_csum(struct iphdr *iph)
 {
 	__u16 *iph16 = (__u16 *)iph;
 	__u32 csum;
-	int i;
+	size_t i;
 
 	iph->check = 0;
 

tools/testing/selftests/bpf/progs/test_xdp.c

@@ -89,7 +89,7 @@ static __always_inline int handle_ipv4(struct xdp_md *xdp)
 	struct vip vip = {};
 	int dport;
 	__u32 csum = 0;
-	int i;
+	size_t i;
 
 	if (iph + 1 > data_end)
 		return XDP_DROP;