[RFC PATCH DRAFT 2/2] l2fwd: update l2fwd to use tx_buffer API

[Bruce Richardson <bruce.richardson-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

The internal buffering of packets for TX done in l2fwd is no longer
needed, so replace this code with calls to the new rte_eth_tx_buffer*
APIs.
---
 examples/l2fwd/main.c | 61 ++++++---------------------------------------------
 1 file changed, 7 insertions(+), 54 deletions(-)

diff --git a/examples/l2fwd/main.c b/examples/l2fwd/main.c
index 4069d7c..5ca5709 100644
--- a/examples/l2fwd/main.c
+++ b/examples/l2fwd/main.c
@@ -231,52 +231,6 @@ print_stats(void)
 	printf("\n====================================================\n");
 }
 
-/* Send the burst of packets on an output interface */
-static int
-l2fwd_send_burst(struct lcore_queue_conf *qconf, unsigned n, uint8_t port)
-{
-	struct rte_mbuf **m_table;
-	unsigned ret;
-	unsigned queueid =0;
-
-	m_table = (struct rte_mbuf **)qconf->tx_mbufs[port].m_table;
-
-	ret = rte_eth_tx_burst(port, (uint16_t) queueid, m_table, (uint16_t) n);
-	port_statistics[port].tx += ret;
-	if (unlikely(ret < n)) {
-		port_statistics[port].dropped += (n - ret);
-		do {
-			rte_pktmbuf_free(m_table[ret]);
-		} while (++ret < n);
-	}
-
-	return 0;
-}
-
-/* Enqueue packets for TX and prepare them to be sent */
-static int
-l2fwd_send_packet(struct rte_mbuf *m, uint8_t port)
-{
-	unsigned lcore_id, len;
-	struct lcore_queue_conf *qconf;
-
-	lcore_id = rte_lcore_id();
-
-	qconf = &lcore_queue_conf[lcore_id];
-	len = qconf->tx_mbufs[port].len;
-	qconf->tx_mbufs[port].m_table[len] = m;
-	len++;
-
-	/* enough pkts to be sent */
-	if (unlikely(len == MAX_PKT_BURST)) {
-		l2fwd_send_burst(qconf, MAX_PKT_BURST, port);
-		len = 0;
-	}
-
-	qconf->tx_mbufs[port].len = len;
-	return 0;
-}
-
 static void
 l2fwd_simple_forward(struct rte_mbuf *m, unsigned portid)
 {
@@ -294,7 +248,7 @@ l2fwd_simple_forward(struct rte_mbuf *m, unsigned portid)
 	/* src addr */
 	ether_addr_copy(&l2fwd_ports_eth_addr[dst_port], &eth->s_addr);
 
-	l2fwd_send_packet(m, (uint8_t) dst_port);
+	port_statistics[dst_port].tx += rte_eth_tx_buffer(dst_port, 0, m);
 }
 
 /* main processing loop */
@@ -339,13 +293,12 @@ l2fwd_main_loop(void)
 		diff_tsc = cur_tsc - prev_tsc;
 		if (unlikely(diff_tsc > drain_tsc)) {
 
-			for (portid = 0; portid < RTE_MAX_ETHPORTS; portid++) {
-				if (qconf->tx_mbufs[portid].len == 0)
-					continue;
-				l2fwd_send_burst(&lcore_queue_conf[lcore_id],
-						 qconf->tx_mbufs[portid].len,
-						 (uint8_t) portid);
-				qconf->tx_mbufs[portid].len = 0;
+			for (i = 0; i < qconf->n_rx_port; i++) {
+
+				portid = qconf->rx_port_list[i];
+				portid = l2fwd_dst_ports[portid];
+				port_statistics[portid].tx +=
+					rte_eth_tx_buffer_flush(portid, 0);
 			}
 
 			/* if timer is enabled */
-- 
1.9.3