[PACKET_IO] add pio_packet structure for pcap_live/pcap_file mode

src/common/pio_packet_queue.h

@@ -0,0 +1,62 @@
+/*
+**********************************************************************************************
+*	File: pio_packet_queue.h
+*   Description: pio packet queue structure and api
+*	Authors: Liu WenTan <liuwentan@geedgenetworks.com>
+*	Date:    2022-07-15
+*   Copyright: (c) 2018-2022 Geedge Networks, Inc. All rights reserved.
+***********************************************************************************************
+*/
+
+#pragma once
+
+#include <stdint.h>
+
+#define PKT_QUEUE_MAX_NUM 256
+
+#define CUSTOM_ZONE_LEN 64
+#define ETHERNET_HEADER_LEN 14
+#define DEFAULT_MTU 1500
+#define DEFAULT_PACKET_SIZE (CUSTOM_ZONE_LEN + DEFAULT_MTU + ETHERNET_HEADER_LEN)
+
+#define SIZE_OF_PIO_PACKET (DEFAULT_PACKET_SIZE + sizeof(struct pio_packet))
+
+/*
+ * @brief pcap_live/pcap_file mode packet structure
+ *
+ * |<-pkt_hdr    |<-pkt_payload
+ * |             |
+ * | struct pio_packet | custom zone | L2 header | ...... |
+ *                        64bytes      14bytes    1500bytes
+ *   
+ * custom zone: user can set custom field
+ * pkt_payload: received packet data
+**/
+struct pio_packet {
+    /* pkt header pointer */
+    void *pkt_hdr;
+
+    /* pkt length */
+    uint64_t pkt_len;
+
+    /* pkt payload pointer */
+    void *pkt_payload;
+
+    /* reference counts */
+    uint64_t ref_cnt;
+
+	struct pio_packet *prev;
+	
+	struct pio_packet *next;
+};
+
+struct pio_packet_queue {
+	struct pio_packet *top;
+	struct pio_packet *bot;
+	uint32_t len;
+	pthread_mutex_t mutex_q;
+};
+
+void pio_packet_enqueue(struct pio_packet_queue *, struct pio_packet *);
+struct pio_packet *pio_packet_dequeue(struct pio_packet_queue *);
+void release_pio_packet_queue(struct pio_packet_queue *);