dump the content of non-ip packets for debug purposes

udpdk/Makefile

@@ -40,6 +40,7 @@ UDPDK_C= ${CC} -c $(DPDK_CFLAGS) $(UDPDK_CFLAGS) ${CFLAGS} ${WERROR} $<
 
 UDPDK_CORE_SRCS+=    \
 	udpdk_args.c     \
+	udpdk_dump.c     \
 	udpdk_globals.c  \
 	udpdk_init.c     \
 	udpdk_bind_table.c \

udpdk/udpdk_api.symlist

@@ -8,3 +8,4 @@ udpdk_bind
 udpdk_sendto
 udpdk_recvfrom
 udpdk_close
+udpdk_dump_payload

udpdk/udpdk_dump.c

+//
+// Created by leoll2 on 11/19/20.
+// Copyright (c) 2020 Leonardo Lai. All rights reserved.
+//
+// The following code derives in part from netmap pkt-gen.c
+//
+
+#include <ctype.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <rte_mbuf.h>
+
+#include "udpdk_dump.h"
+
+
+/* Print the content of the packet in hex and ASCII */
+void udpdk_dump_payload(const char *payload, int len)
+{
+	char buf[128];
+	int i, j, i0;
+	const unsigned char *p = (const unsigned char *)payload;
+
+    printf("Dumping payload [len = %d]:\n", len);
+
+	/* hexdump routine */
+	for (i = 0; i < len; ) {
+		memset(buf, ' ', sizeof(buf));
+		sprintf(buf, "%5d: ", i);
+		i0 = i;
+		for (j = 0; j < 16 && i < len; i++, j++)
+			sprintf(buf + 7 + j*3, "%02x ", (uint8_t)(p[i]));
+		i = i0;
+		for (j = 0; j < 16 && i < len; i++, j++)
+			sprintf(buf + 7 + j + 48, "%c",
+				isprint(p[i]) ? p[i] : '.');
+		printf("%s\n", buf);
+	}
+}
+
+void udpdk_dump_mbuf(struct rte_mbuf *m)
+{
+    udpdk_dump_payload(rte_pktmbuf_mtod(m, char *), rte_pktmbuf_data_len(m));
+}

udpdk/udpdk_dump.h

+//
+// Created by leoll2 on 11/19/20.
+// Copyright (c) 2020 Leonardo Lai. All rights reserved.
+//
+// The following code derives in part from netmap pkt-gen.c
+//
+
+#ifndef UDPDK_DUMP_H
+#define UDPDK_DUMP_H
+
+void udpdk_dump_payload(const char *payload, int len);
+
+void udpdk_dump_mbuf(struct rte_mbuf *m);
+
+#endif  // UDPDK_DUMP_H

udpdk/udpdk_poller.c

@@ -26,6 +26,7 @@
 
 #include "udpdk_constants.h"
 #include "udpdk_bind_table.h"
+#include "udpdk_dump.h"
 #include "udpdk_shmalloc.h"
 #include "udpdk_sync.h"
 #include "udpdk_types.h"
@@ -359,7 +360,8 @@ static inline void reassemble(struct rte_mbuf *m, uint16_t portid, uint32_t queu
             }
         }
     } else {
-        RTE_LOG(WARNING, POLLBODY, "Received non-IPv4 packet.\n");
+        RTE_LOG(WARNING, POLLBODY, "Received non-IPv4 packet, showing content below:\n");
+        udpdk_dump_mbuf(m);
         return;
     }