selftests/bpf: introduce bpf_cpu_to_be64 and bpf_be64_to_cpu

test_lwt_seg6local and test_seg6_loop use custom 64-bit endianness
conversion macros. Centralize their definitions in bpf_endian.h in order
to reduce code duplication. This will also be useful when bpf_endian.h
is promoted to an offical libbpf header.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

diff --git a/tools/testing/selftests/bpf/bpf_endian.h b/tools/testing/selftests/bpf/bpf_endian.h
index ff3593b..fbe2800 100644 (file)
--- a/tools/testing/selftests/bpf/bpf_endian.h
+++ b/tools/testing/selftests/bpf/bpf_endian.h
@@ -29,6 +29,10 @@
 # define __bpf_htonl(x)                        __builtin_bswap32(x)
 # define __bpf_constant_ntohl(x)       ___constant_swab32(x)
 # define __bpf_constant_htonl(x)       ___constant_swab32(x)
+# define __bpf_be64_to_cpu(x)          __builtin_bswap64(x)
+# define __bpf_cpu_to_be64(x)          __builtin_bswap64(x)
+# define __bpf_constant_be64_to_cpu(x) ___constant_swab64(x)
+# define __bpf_constant_cpu_to_be64(x) ___constant_swab64(x)
 #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
 # define __bpf_ntohs(x)                        (x)
 # define __bpf_htons(x)                        (x)
@@ -38,6 +42,10 @@
 # define __bpf_htonl(x)                        (x)
 # define __bpf_constant_ntohl(x)       (x)
 # define __bpf_constant_htonl(x)       (x)
+# define __bpf_be64_to_cpu(x)          (x)
+# define __bpf_cpu_to_be64(x)          (x)
+# define __bpf_constant_be64_to_cpu(x)  (x)
+# define __bpf_constant_cpu_to_be64(x)  (x)
 #else
 # error "Fix your compiler's __BYTE_ORDER__?!"
 #endif
@@ -54,5 +62,11 @@
 #define bpf_ntohl(x)                           \
        (__builtin_constant_p(x) ?              \
         __bpf_constant_ntohl(x) : __bpf_ntohl(x))
+#define bpf_cpu_to_be64(x)                     \
+       (__builtin_constant_p(x) ?              \
+        __bpf_constant_cpu_to_be64(x) : __bpf_cpu_to_be64(x))
+#define bpf_be64_to_cpu(x)                     \
+       (__builtin_constant_p(x) ?              \
+        __bpf_constant_be64_to_cpu(x) : __bpf_be64_to_cpu(x))
 
 #endif /* __BPF_ENDIAN__ */

diff --git a/tools/testing/selftests/bpf/progs/test_lwt_seg6local.c b/tools/testing/selftests/bpf/progs/test_lwt_seg6local.c
index a334a0e..41a3ebc 100644 (file)
--- a/tools/testing/selftests/bpf/progs/test_lwt_seg6local.c
+++ b/tools/testing/selftests/bpf/progs/test_lwt_seg6local.c
@@ -12,10 +12,6 @@
 
 #define SR6_FLAG_ALERT (1 << 4)
 
-#define htonll(x) ((bpf_htonl(1)) == 1 ? (x) : ((uint64_t)bpf_htonl((x) & \
-                               0xFFFFFFFF) << 32) | bpf_htonl((x) >> 32))
-#define ntohll(x) ((bpf_ntohl(1)) == 1 ? (x) : ((uint64_t)bpf_ntohl((x) & \
-                               0xFFFFFFFF) << 32) | bpf_ntohl((x) >> 32))
 #define BPF_PACKET_HEADER __attribute__((packed))
 
 struct ip6_t {
@@ -276,8 +272,8 @@ int has_egr_tlv(struct __sk_buff *skb, struct ip6_srh_t *srh)
                        return 0;
 
                // check if egress TLV value is correct
-               if (ntohll(egr_addr.hi) == 0xfd00000000000000 &&
-                               ntohll(egr_addr.lo) == 0x4)
+               if (bpf_be64_to_cpu(egr_addr.hi) == 0xfd00000000000000 &&
+                   bpf_be64_to_cpu(egr_addr.lo) == 0x4)
                        return 1;
        }
 
@@ -308,8 +304,8 @@ int __encap_srh(struct __sk_buff *skb)
 
        #pragma clang loop unroll(full)
        for (unsigned long long lo = 0; lo < 4; lo++) {
-               seg->lo = htonll(4 - lo);
-               seg->hi = htonll(hi);
+               seg->lo = bpf_cpu_to_be64(4 - lo);
+               seg->hi = bpf_cpu_to_be64(hi);
                seg = (struct ip6_addr_t *)((char *)seg + sizeof(*seg));
        }
 
@@ -349,8 +345,8 @@ int __add_egr_x(struct __sk_buff *skb)
        if (err)
                return BPF_DROP;
 
-       addr.lo = htonll(lo);
-       addr.hi = htonll(hi);
+       addr.lo = bpf_cpu_to_be64(lo);
+       addr.hi = bpf_cpu_to_be64(hi);
        err = bpf_lwt_seg6_action(skb, SEG6_LOCAL_ACTION_END_X,
                                  (void *)&addr, sizeof(addr));
        if (err)

diff --git a/tools/testing/selftests/bpf/progs/test_seg6_loop.c b/tools/testing/selftests/bpf/progs/test_seg6_loop.c
index 1dbe1d4..c4d1044 100644 (file)
--- a/tools/testing/selftests/bpf/progs/test_seg6_loop.c
+++ b/tools/testing/selftests/bpf/progs/test_seg6_loop.c
@@ -12,10 +12,6 @@
 
 #define SR6_FLAG_ALERT (1 << 4)
 
-#define htonll(x) ((bpf_htonl(1)) == 1 ? (x) : ((uint64_t)bpf_htonl((x) & \
-                               0xFFFFFFFF) << 32) | bpf_htonl((x) >> 32))
-#define ntohll(x) ((bpf_ntohl(1)) == 1 ? (x) : ((uint64_t)bpf_ntohl((x) & \
-                               0xFFFFFFFF) << 32) | bpf_ntohl((x) >> 32))
 #define BPF_PACKET_HEADER __attribute__((packed))
 
 struct ip6_t {
@@ -251,8 +247,8 @@ int __add_egr_x(struct __sk_buff *skb)
        if (err)
                return BPF_DROP;
 
-       addr.lo = htonll(lo);
-       addr.hi = htonll(hi);
+       addr.lo = bpf_cpu_to_be64(lo);
+       addr.hi = bpf_cpu_to_be64(hi);
        err = bpf_lwt_seg6_action(skb, SEG6_LOCAL_ACTION_END_X,
                                  (void *)&addr, sizeof(addr));
        if (err)