txrx-tsn: Add extra flush packets in TX thread

Changes:
- Extra flush packets are added in TX thread to ensure
  the original num of packets in TX ring is sent
  (similar to kick_tx()).
- Initiate the packet RX from packet num 1

Signed-off-by: Goh Wei Sheng <wei.sheng.goh@intel.com>

src/txrx-afxdp.c

@@ -77,6 +77,7 @@ extern uint32_t glob_rx_seq;
 
 /* User Defines */
 #define BATCH_SIZE 64	//for l2fwd only
+#define DEFAULT_NUM_FLUSH_PACKETS 10 //for socket flushing
 
 /* Signal handler to gracefully shutdown */
 void afxdp_sigint_handler(int signum)
@@ -349,7 +350,7 @@ void *afxdp_send_thread(void *arg)
 	struct timespec ts;
 
 	struct xsk_info *xsk = opt->xsk;
-	uint64_t seq_num = 1;
+	uint64_t seq_num = 0;
 	uint64_t i = 0;
 
 	/* Create packet template */
@@ -366,7 +367,7 @@ void *afxdp_send_thread(void *arg)
 	tx_timestamp += opt->offset_ns;
 	tx_timestamp += 2 * NSEC_PER_SEC;
 
-	while(!halt_tx_sig && (i < opt->frames_to_send) ) {
+	while(!halt_tx_sig && (i < opt->frames_to_send + DEFAULT_NUM_FLUSH_PACKETS) ) {
 
 		sleep_timestamp = tx_timestamp - opt->early_offset_ns;
 		ts.tv_sec = sleep_timestamp / NSEC_PER_SEC;