[dpdk-dev] [PATCH v2] test/bpf: use hton instead of _builtin_bswap

[Malvika Gupta <malvika.gupta@arm.com>]

From: Malvika Gupta <Malvika.Gupta@arm.com>

Convert host machine endianness to networking endianness for
comparison of incoming packets with BPF filter

Suggested-by: Brian Brooks <brian.brooks@arm.com>
Signed-off-by: Malvika Gupta <malvika.gupta@arm.com>
Reviewed-by: Gavin Hu <gavin.hu@arm.com>
Reviewed-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Acked-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
---
v2:
* Correct compilation command in the comments for x86.
* Added compilation command for ARM.

---
 test/bpf/t1.c | 14 +++++++++-----
 test/bpf/t3.c | 13 ++++++++++---
 2 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/test/bpf/t1.c b/test/bpf/t1.c
index 60f9434ab..3364b4f1e 100644
--- a/test/bpf/t1.c
+++ b/test/bpf/t1.c
@@ -20,32 +20,36 @@
  * (011) ret      #1
  * (012) ret      #0
  *
- * To compile:
- * clang -O2 -target bpf -c t1.c
+ * To compile on x86:
+ * clang -O2 -U __GNUC__ -target bpf -c t1.c
+ *
+ * To compile on ARM:
+ * clang -O2 -I/usr/include/aarch64-linux-gnu/ -target bpf -c t1.c
  */
 
 #include <stdint.h>
 #include <net/ethernet.h>
 #include <netinet/ip.h>
 #include <netinet/udp.h>
+#include <arpa/inet.h>
 
 uint64_t
 entry(void *pkt)
 {
 	struct ether_header *ether_header = (void *)pkt;
 
-	if (ether_header->ether_type != __builtin_bswap16(0x0800))
+	if (ether_header->ether_type != htons(0x0800))
 		return 0;
 
 	struct iphdr *iphdr = (void *)(ether_header + 1);
 	if (iphdr->protocol != 17 || (iphdr->frag_off & 0x1ffff) != 0 ||
-			iphdr->daddr != __builtin_bswap32(0x1020304))
+			iphdr->daddr != htonl(0x1020304))
 		return 0;
 
 	int hlen = iphdr->ihl * 4;
 	struct udphdr *udphdr = (void *)iphdr + hlen;
 
-	if (udphdr->dest !=  __builtin_bswap16(5000))
+	if (udphdr->dest != htons(5000))
 		return 0;
 
 	return 1;
diff --git a/test/bpf/t3.c b/test/bpf/t3.c
index 531b9cb8c..9ba34638a 100644
--- a/test/bpf/t3.c
+++ b/test/bpf/t3.c
@@ -6,9 +6,15 @@
  * eBPF program sample.
  * Accepts pointer to struct rte_mbuf as an input parameter.
  * Dump the mbuf into stdout if it is an ARP packet (aka tcpdump 'arp').
- * To compile:
- * clang -O2 -I${RTE_SDK}/${RTE_TARGET}/include \
+ *
+ * To compile on x86:
+ * clang -O2 -U __GNUC__ -I${RTE_SDK}/${RTE_TARGET}/include \
  * -target bpf -Wno-int-to-void-pointer-cast -c t3.c
+ *
+ * To compile on ARM:
+ * clang -O2 -I/usr/include/aarch64-linux-gnu \
+ * -I${RTE_SDK}/${RTE_TARGET}/include -target bpf \
+ * -Wno-int-to-void-pointer-cast -c t3.c
  */
 
 #include <stdint.h>
@@ -17,6 +23,7 @@
 #include <net/ethernet.h>
 #include <rte_config.h>
 #include "mbuf.h"
+#include <arpa/inet.h>
 
 extern void rte_pktmbuf_dump(FILE *, const struct rte_mbuf *, unsigned int);
 
@@ -29,7 +36,7 @@ entry(const void *pkt)
 	mb = pkt;
 	eth = rte_pktmbuf_mtod(mb, const struct ether_header *);
 
-	if (eth->ether_type == __builtin_bswap16(ETHERTYPE_ARP))
+	if (eth->ether_type == htons(ETHERTYPE_ARP))
 		rte_pktmbuf_dump(stdout, mb, 64);
 
 	return 1;
-- 
2.17.1