[dpdk-dev] [PATCH v3 4/4] app/testpmd: display/clear forwarding stats on demand

[David Marchand <david.marchand@redhat.com>]

Add a new "show/clear fwd stats all" command to display fwd and port
statistics on the fly.

To be able to do so, the (testpmd only) rte_port structure can't be used
to maintain any statistics.
Moved the stats dump parts from stop_packet_forwarding() and merge with
fwd_port_stats_display() into fwd_stats_display().
fwd engine statistics are then aggregated into a local per port array.

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
Changelog since v1:
- removed hunk from now deleted patch 3

---
 app/test-pmd/cmdline.c                      |  44 +++
 app/test-pmd/testpmd.c                      | 425 +++++++++++++++-------------
 app/test-pmd/testpmd.h                      |   9 +-
 doc/guides/testpmd_app_ug/testpmd_funcs.rst |  36 +++
 4 files changed, 305 insertions(+), 209 deletions(-)

diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
index db53cc0..58b11b7 100644
--- a/app/test-pmd/cmdline.c
+++ b/app/test-pmd/cmdline.c
@@ -7386,6 +7386,49 @@ struct cmd_showqueue_result {
 	},
 };
 
+/* show/clear fwd engine statistics */
+struct fwd_result {
+	cmdline_fixed_string_t action;
+	cmdline_fixed_string_t fwd;
+	cmdline_fixed_string_t stats;
+	cmdline_fixed_string_t all;
+};
+
+cmdline_parse_token_string_t cmd_fwd_action =
+	TOKEN_STRING_INITIALIZER(struct fwd_result, action, "show#clear");
+cmdline_parse_token_string_t cmd_fwd_fwd =
+	TOKEN_STRING_INITIALIZER(struct fwd_result, fwd, "fwd");
+cmdline_parse_token_string_t cmd_fwd_stats =
+	TOKEN_STRING_INITIALIZER(struct fwd_result, stats, "stats");
+cmdline_parse_token_string_t cmd_fwd_all =
+	TOKEN_STRING_INITIALIZER(struct fwd_result, all, "all");
+
+static void
+cmd_fwd_parsed(void *parsed_result,
+	       __rte_unused struct cmdline *cl,
+	       __rte_unused void *data)
+{
+	struct fwd_result *res = parsed_result;
+
+	if (!strcmp(res->action, "show"))
+		fwd_stats_display();
+	else
+		fwd_stats_reset();
+}
+
+static cmdline_parse_inst_t cmd_fwdall = {
+	.f = cmd_fwd_parsed,
+	.data = NULL,
+	.help_str = "show|clear fwd stats all",
+	.tokens = {
+		(void *)&cmd_fwd_action,
+		(void *)&cmd_fwd_fwd,
+		(void *)&cmd_fwd_stats,
+		(void *)&cmd_fwd_all,
+		NULL,
+	},
+};
+
 /* *** READ PORT REGISTER *** */
 struct cmd_read_reg_result {
 	cmdline_fixed_string_t read;
@@ -18559,6 +18602,7 @@ struct cmd_show_tx_metadata_result {
 	(cmdline_parse_inst_t *)&cmd_showqueue,
 	(cmdline_parse_inst_t *)&cmd_showportall,
 	(cmdline_parse_inst_t *)&cmd_showcfg,
+	(cmdline_parse_inst_t *)&cmd_fwdall,
 	(cmdline_parse_inst_t *)&cmd_start,
 	(cmdline_parse_inst_t *)&cmd_start_tx_first,
 	(cmdline_parse_inst_t *)&cmd_start_tx_first_n,
diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 103319f..b466217 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -1361,91 +1361,6 @@ struct extmem_param {
 #endif /* RTE_TEST_PMD_RECORD_BURST_STATS */
 
 static void
-fwd_port_stats_display(portid_t port_id, struct rte_eth_stats *stats)
-{
-	struct rte_port *port;
-	uint8_t i;
-
-	static const char *fwd_stats_border = "----------------------";
-
-	port = &ports[port_id];
-	printf("\n  %s Forward statistics for port %-2d %s\n",
-	       fwd_stats_border, port_id, fwd_stats_border);
-
-	if ((!port->rx_queue_stats_mapping_enabled) && (!port->tx_queue_stats_mapping_enabled)) {
-		printf("  RX-packets: %-14"PRIu64" RX-dropped: %-14"PRIu64"RX-total: "
-		       "%-"PRIu64"\n",
-		       stats->ipackets, stats->imissed,
-		       stats->ipackets + stats->imissed);
-
-		if (cur_fwd_eng == &csum_fwd_engine)
-			printf("  Bad-ipcsum: %-14"PRIu64" Bad-l4csum: %-14"PRIu64"Bad-outer-l4csum: %-14"PRIu64"\n",
-			       port->rx_bad_ip_csum, port->rx_bad_l4_csum,
-			       port->rx_bad_outer_l4_csum);
-		if ((stats->ierrors + stats->rx_nombuf) > 0) {
-			printf("  RX-error: %-"PRIu64"\n",  stats->ierrors);
-			printf("  RX-nombufs: %-14"PRIu64"\n", stats->rx_nombuf);
-		}
-
-		printf("  TX-packets: %-14"PRIu64" TX-dropped: %-14"PRIu64"TX-total: "
-		       "%-"PRIu64"\n",
-		       stats->opackets, port->tx_dropped,
-		       stats->opackets + port->tx_dropped);
-	}
-	else {
-		printf("  RX-packets:             %14"PRIu64"    RX-dropped:%14"PRIu64"    RX-total:"
-		       "%14"PRIu64"\n",
-		       stats->ipackets, stats->imissed,
-		       stats->ipackets + stats->imissed);
-
-		if (cur_fwd_eng == &csum_fwd_engine)
-			printf("  Bad-ipcsum:%14"PRIu64"    Bad-l4csum:%14"PRIu64"    Bad-outer-l4csum: %-14"PRIu64"\n",
-			       port->rx_bad_ip_csum, port->rx_bad_l4_csum,
-			       port->rx_bad_outer_l4_csum);
-		if ((stats->ierrors + stats->rx_nombuf) > 0) {
-			printf("  RX-error:%"PRIu64"\n", stats->ierrors);
-			printf("  RX-nombufs:             %14"PRIu64"\n",
-			       stats->rx_nombuf);
-		}
-
-		printf("  TX-packets:             %14"PRIu64"    TX-dropped:%14"PRIu64"    TX-total:"
-		       "%14"PRIu64"\n",
-		       stats->opackets, port->tx_dropped,
-		       stats->opackets + port->tx_dropped);
-	}
-
-#ifdef RTE_TEST_PMD_RECORD_BURST_STATS
-	if (port->rx_stream)
-		pkt_burst_stats_display("RX",
-			&port->rx_stream->rx_burst_stats);
-	if (port->tx_stream)
-		pkt_burst_stats_display("TX",
-			&port->tx_stream->tx_burst_stats);
-#endif
-
-	if (port->rx_queue_stats_mapping_enabled) {
-		printf("\n");
-		for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS; i++) {
-			printf("  Stats reg %2d RX-packets:%14"PRIu64
-			       "     RX-errors:%14"PRIu64
-			       "    RX-bytes:%14"PRIu64"\n",
-			       i, stats->q_ipackets[i], stats->q_errors[i], stats->q_ibytes[i]);
-		}
-		printf("\n");
-	}
-	if (port->tx_queue_stats_mapping_enabled) {
-		for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS; i++) {
-			printf("  Stats reg %2d TX-packets:%14"PRIu64
-			       "                                 TX-bytes:%14"PRIu64"\n",
-			       i, stats->q_opackets[i], stats->q_obytes[i]);
-		}
-	}
-
-	printf("  %s--------------------------------%s\n",
-	       fwd_stats_border, fwd_stats_border);
-}
-
-static void
 fwd_stream_stats_display(streamid_t stream_id)
 {
 	struct fwd_stream *fs;
@@ -1478,6 +1393,224 @@ struct extmem_param {
 #endif
 }
 
+void
+fwd_stats_display(void)
+{
+	static const char *fwd_stats_border = "----------------------";
+	static const char *acc_stats_border = "+++++++++++++++";
+	struct {
+		struct fwd_stream *rx_stream;
+		struct fwd_stream *tx_stream;
+		uint64_t tx_dropped;
+		uint64_t rx_bad_ip_csum;
+		uint64_t rx_bad_l4_csum;
+		uint64_t rx_bad_outer_l4_csum;
+	} ports_stats[RTE_MAX_ETHPORTS];
+	uint64_t total_rx_dropped = 0;
+	uint64_t total_tx_dropped = 0;
+	uint64_t total_rx_nombuf = 0;
+	struct rte_eth_stats stats;
+#ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
+	uint64_t fwd_cycles = 0;
+#endif
+	uint64_t total_recv = 0;
+	uint64_t total_xmit = 0;
+	struct rte_port *port;
+	streamid_t sm_id;
+	portid_t pt_id;
+	int i;
+
+	memset(ports_stats, 0, sizeof(ports_stats));
+
+	for (sm_id = 0; sm_id < cur_fwd_config.nb_fwd_streams; sm_id++) {
+		struct fwd_stream *fs = fwd_streams[sm_id];
+
+		if (cur_fwd_config.nb_fwd_streams >
+		    cur_fwd_config.nb_fwd_ports) {
+			fwd_stream_stats_display(sm_id);
+		} else {
+			ports_stats[fs->tx_port].tx_stream = fs;
+			ports_stats[fs->rx_port].rx_stream = fs;
+		}
+
+		ports_stats[fs->tx_port].tx_dropped += fs->fwd_dropped;
+
+		ports_stats[fs->rx_port].rx_bad_ip_csum += fs->rx_bad_ip_csum;
+		ports_stats[fs->rx_port].rx_bad_l4_csum += fs->rx_bad_l4_csum;
+		ports_stats[fs->rx_port].rx_bad_outer_l4_csum +=
+				fs->rx_bad_outer_l4_csum;
+
+#ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
+		fwd_cycles += fs->core_cycles;
+#endif
+	}
+	for (i = 0; i < cur_fwd_config.nb_fwd_ports; i++) {
+		uint8_t j;
+
+		pt_id = fwd_ports_ids[i];
+		port = &ports[pt_id];
+
+		rte_eth_stats_get(pt_id, &stats);
+		stats.ipackets -= port->stats.ipackets;
+		stats.opackets -= port->stats.opackets;
+		stats.ibytes -= port->stats.ibytes;
+		stats.obytes -= port->stats.obytes;
+		stats.imissed -= port->stats.imissed;
+		stats.oerrors -= port->stats.oerrors;
+		stats.rx_nombuf -= port->stats.rx_nombuf;
+
+		total_recv += stats.ipackets;
+		total_xmit += stats.opackets;
+		total_rx_dropped += stats.imissed;
+		total_tx_dropped += ports_stats[pt_id].tx_dropped;
+		total_tx_dropped += stats.oerrors;
+		total_rx_nombuf  += stats.rx_nombuf;
+
+		printf("\n  %s Forward statistics for port %-2d %s\n",
+		       fwd_stats_border, pt_id, fwd_stats_border);
+
+		if (!port->rx_queue_stats_mapping_enabled &&
+		    !port->tx_queue_stats_mapping_enabled) {
+			printf("  RX-packets: %-14"PRIu64
+			       " RX-dropped: %-14"PRIu64
+			       "RX-total: %-"PRIu64"\n",
+			       stats.ipackets, stats.imissed,
+			       stats.ipackets + stats.imissed);
+
+			if (cur_fwd_eng == &csum_fwd_engine)
+				printf("  Bad-ipcsum: %-14"PRIu64
+				       " Bad-l4csum: %-14"PRIu64
+				       "Bad-outer-l4csum: %-14"PRIu64"\n",
+				       ports_stats[pt_id].rx_bad_ip_csum,
+				       ports_stats[pt_id].rx_bad_l4_csum,
+				       ports_stats[pt_id].rx_bad_outer_l4_csum);
+			if (stats.ierrors + stats.rx_nombuf > 0) {
+				printf("  RX-error: %-"PRIu64"\n",
+				       stats.ierrors);
+				printf("  RX-nombufs: %-14"PRIu64"\n",
+				       stats.rx_nombuf);
+			}
+
+			printf("  TX-packets: %-14"PRIu64
+			       " TX-dropped: %-14"PRIu64
+			       "TX-total: %-"PRIu64"\n",
+			       stats.opackets, ports_stats[pt_id].tx_dropped,
+			       stats.opackets + ports_stats[pt_id].tx_dropped);
+		} else {
+			printf("  RX-packets:             %14"PRIu64
+			       "    RX-dropped:%14"PRIu64
+			       "    RX-total:%14"PRIu64"\n",
+			       stats.ipackets, stats.imissed,
+			       stats.ipackets + stats.imissed);
+
+			if (cur_fwd_eng == &csum_fwd_engine)
+				printf("  Bad-ipcsum:%14"PRIu64
+				       "    Bad-l4csum:%14"PRIu64
+				       "    Bad-outer-l4csum: %-14"PRIu64"\n",
+				       ports_stats[pt_id].rx_bad_ip_csum,
+				       ports_stats[pt_id].rx_bad_l4_csum,
+				       ports_stats[pt_id].rx_bad_outer_l4_csum);
+			if ((stats.ierrors + stats.rx_nombuf) > 0) {
+				printf("  RX-error:%"PRIu64"\n", stats.ierrors);
+				printf("  RX-nombufs:             %14"PRIu64"\n",
+				       stats.rx_nombuf);
+			}
+
+			printf("  TX-packets:             %14"PRIu64
+			       "    TX-dropped:%14"PRIu64
+			       "    TX-total:%14"PRIu64"\n",
+			       stats.opackets, ports_stats[pt_id].tx_dropped,
+			       stats.opackets + ports_stats[pt_id].tx_dropped);
+		}
+
+#ifdef RTE_TEST_PMD_RECORD_BURST_STATS
+		if (ports_stats[pt_id].rx_stream)
+			pkt_burst_stats_display("RX",
+				&ports_stats[pt_id].rx_stream->rx_burst_stats);
+		if (ports_stats[pt_id].tx_stream)
+			pkt_burst_stats_display("TX",
+				&ports_stats[pt_id].tx_stream->tx_burst_stats);
+#endif
+
+		if (port->rx_queue_stats_mapping_enabled) {
+			printf("\n");
+			for (j = 0; j < RTE_ETHDEV_QUEUE_STAT_CNTRS; j++) {
+				printf("  Stats reg %2d RX-packets:%14"PRIu64
+				       "     RX-errors:%14"PRIu64
+				       "    RX-bytes:%14"PRIu64"\n",
+				       j, stats.q_ipackets[j],
+				       stats.q_errors[j], stats.q_ibytes[j]);
+			}
+			printf("\n");
+		}
+		if (port->tx_queue_stats_mapping_enabled) {
+			for (j = 0; j < RTE_ETHDEV_QUEUE_STAT_CNTRS; j++) {
+				printf("  Stats reg %2d TX-packets:%14"PRIu64
+				       "                                 TX-bytes:%14"
+				       PRIu64"\n",
+				       j, stats.q_opackets[j],
+				       stats.q_obytes[j]);
+			}
+		}
+
+		printf("  %s--------------------------------%s\n",
+		       fwd_stats_border, fwd_stats_border);
+	}
+
+	printf("\n  %s Accumulated forward statistics for all ports"
+	       "%s\n",
+	       acc_stats_border, acc_stats_border);
+	printf("  RX-packets: %-14"PRIu64" RX-dropped: %-14"PRIu64"RX-total: "
+	       "%-"PRIu64"\n"
+	       "  TX-packets: %-14"PRIu64" TX-dropped: %-14"PRIu64"TX-total: "
+	       "%-"PRIu64"\n",
+	       total_recv, total_rx_dropped, total_recv + total_rx_dropped,
+	       total_xmit, total_tx_dropped, total_xmit + total_tx_dropped);
+	if (total_rx_nombuf > 0)
+		printf("  RX-nombufs: %-14"PRIu64"\n", total_rx_nombuf);
+	printf("  %s++++++++++++++++++++++++++++++++++++++++++++++"
+	       "%s\n",
+	       acc_stats_border, acc_stats_border);
+#ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
+	if (total_recv > 0)
+		printf("\n  CPU cycles/packet=%u (total cycles="
+		       "%"PRIu64" / total RX packets=%"PRIu64")\n",
+		       (unsigned int)(fwd_cycles / total_recv),
+		       fwd_cycles, total_recv);
+#endif
+}
+
+void
+fwd_stats_reset(void)
+{
+	streamid_t sm_id;
+	portid_t pt_id;
+	int i;
+
+	for (i = 0; i < cur_fwd_config.nb_fwd_ports; i++) {
+		pt_id = fwd_ports_ids[i];
+		rte_eth_stats_get(pt_id, &ports[pt_id].stats);
+	}
+	for (sm_id = 0; sm_id < cur_fwd_config.nb_fwd_streams; sm_id++) {
+		struct fwd_stream *fs = fwd_streams[sm_id];
+
+		fs->rx_packets = 0;
+		fs->tx_packets = 0;
+		fs->fwd_dropped = 0;
+		fs->rx_bad_ip_csum = 0;
+		fs->rx_bad_l4_csum = 0;
+		fs->rx_bad_outer_l4_csum = 0;
+
+#ifdef RTE_TEST_PMD_RECORD_BURST_STATS
+		memset(&fs->rx_burst_stats, 0, sizeof(fs->rx_burst_stats));
+		memset(&fs->tx_burst_stats, 0, sizeof(fs->tx_burst_stats));
+#endif
+#ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
+		fs->core_cycles = 0;
+#endif
+	}
+}
+
 static void
 flush_fwd_rx_queues(void)
 {
@@ -1633,7 +1766,6 @@ struct extmem_param {
 	struct rte_port *port;
 	unsigned int i;
 	portid_t   pt_id;
-	streamid_t sm_id;
 
 	if (strcmp(cur_fwd_eng->fwd_mode_name, "rxonly") == 0 && !nb_rxq)
 		rte_exit(EXIT_FAILURE, "rxq are 0, cannot use rxonly fwd mode\n");
@@ -1684,32 +1816,12 @@ struct extmem_param {
 	pkt_fwd_config_display(&cur_fwd_config);
 	rxtx_config_display();
 
+	fwd_stats_reset();
 	for (i = 0; i < cur_fwd_config.nb_fwd_ports; i++) {
 		pt_id = fwd_ports_ids[i];
 		port = &ports[pt_id];
-		rte_eth_stats_get(pt_id, &port->stats);
-		port->tx_dropped = 0;
-
 		map_port_queue_stats_mapping_registers(pt_id, port);
 	}
-	for (sm_id = 0; sm_id < cur_fwd_config.nb_fwd_streams; sm_id++) {
-		fwd_streams[sm_id]->rx_packets = 0;
-		fwd_streams[sm_id]->tx_packets = 0;
-		fwd_streams[sm_id]->fwd_dropped = 0;
-		fwd_streams[sm_id]->rx_bad_ip_csum = 0;
-		fwd_streams[sm_id]->rx_bad_l4_csum = 0;
-		fwd_streams[sm_id]->rx_bad_outer_l4_csum = 0;
-
-#ifdef RTE_TEST_PMD_RECORD_BURST_STATS
-		memset(&fwd_streams[sm_id]->rx_burst_stats, 0,
-		       sizeof(fwd_streams[sm_id]->rx_burst_stats));
-		memset(&fwd_streams[sm_id]->tx_burst_stats, 0,
-		       sizeof(fwd_streams[sm_id]->tx_burst_stats));
-#endif
-#ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
-		fwd_streams[sm_id]->core_cycles = 0;
-#endif
-	}
 	if (with_tx_first) {
 		port_fwd_begin = tx_only_engine.port_fwd_begin;
 		if (port_fwd_begin != NULL) {
@@ -1733,23 +1845,10 @@ struct extmem_param {
 void
 stop_packet_forwarding(void)
 {
-	struct rte_eth_stats stats;
-	struct rte_port *port;
-	port_fwd_end_t  port_fwd_end;
+	port_fwd_end_t port_fwd_end;
+	lcoreid_t lc_id;
+	portid_t pt_id;
 	int i;
-	portid_t   pt_id;
-	streamid_t sm_id;
-	lcoreid_t  lc_id;
-	uint64_t total_recv;
-	uint64_t total_xmit;
-	uint64_t total_rx_dropped;
-	uint64_t total_tx_dropped;
-	uint64_t total_rx_nombuf;
-#ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
-	uint64_t fwd_cycles;
-#endif
-
-	static const char *acc_stats_border = "+++++++++++++++";
 
 	if (test_done) {
 		printf("Packet forwarding not started\n");
@@ -1767,87 +1866,9 @@ struct extmem_param {
 			(*port_fwd_end)(pt_id);
 		}
 	}
-#ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
-	fwd_cycles = 0;
-#endif
-	for (sm_id = 0; sm_id < cur_fwd_config.nb_fwd_streams; sm_id++) {
-		struct fwd_stream *fs = fwd_streams[sm_id];
-
-		if (cur_fwd_config.nb_fwd_streams >
-		    cur_fwd_config.nb_fwd_ports) {
-			fwd_stream_stats_display(sm_id);
-			ports[fs->tx_port].tx_stream = NULL;
-			ports[fs->rx_port].rx_stream = NULL;
-		} else {
-			ports[fs->tx_port].tx_stream = fs;
-			ports[fs->rx_port].rx_stream = fs;
-		}
-		ports[fs->tx_port].tx_dropped += fs->fwd_dropped;
-		ports[fs->rx_port].rx_bad_ip_csum += fs->rx_bad_ip_csum;
-		ports[fs->rx_port].rx_bad_l4_csum += fs->rx_bad_l4_csum;
-		ports[fs->rx_port].rx_bad_outer_l4_csum +=
-				fs->rx_bad_outer_l4_csum;
-
-#ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
-		fwd_cycles = (uint64_t) (fwd_cycles +
-					 fwd_streams[sm_id]->core_cycles);
-#endif
-	}
-	total_recv = 0;
-	total_xmit = 0;
-	total_rx_dropped = 0;
-	total_tx_dropped = 0;
-	total_rx_nombuf  = 0;
-	for (i = 0; i < cur_fwd_config.nb_fwd_ports; i++) {
-		pt_id = fwd_ports_ids[i];
-
-		port = &ports[pt_id];
-		rte_eth_stats_get(pt_id, &stats);
-		stats.ipackets -= port->stats.ipackets;
-		port->stats.ipackets = 0;
-		stats.opackets -= port->stats.opackets;
-		port->stats.opackets = 0;
-		stats.ibytes   -= port->stats.ibytes;
-		port->stats.ibytes = 0;
-		stats.obytes   -= port->stats.obytes;
-		port->stats.obytes = 0;
-		stats.imissed  -= port->stats.imissed;
-		port->stats.imissed = 0;
-		stats.oerrors  -= port->stats.oerrors;
-		port->stats.oerrors = 0;
-		stats.rx_nombuf -= port->stats.rx_nombuf;
-		port->stats.rx_nombuf = 0;
-
-		total_recv += stats.ipackets;
-		total_xmit += stats.opackets;
-		total_rx_dropped += stats.imissed;
-		total_tx_dropped += port->tx_dropped;
-		total_rx_nombuf  += stats.rx_nombuf;
 
-		fwd_port_stats_display(pt_id, &stats);
-	}
+	fwd_stats_display();
 
-	printf("\n  %s Accumulated forward statistics for all ports"
-	       "%s\n",
-	       acc_stats_border, acc_stats_border);
-	printf("  RX-packets: %-14"PRIu64" RX-dropped: %-14"PRIu64"RX-total: "
-	       "%-"PRIu64"\n"
-	       "  TX-packets: %-14"PRIu64" TX-dropped: %-14"PRIu64"TX-total: "
-	       "%-"PRIu64"\n",
-	       total_recv, total_rx_dropped, total_recv + total_rx_dropped,
-	       total_xmit, total_tx_dropped, total_xmit + total_tx_dropped);
-	if (total_rx_nombuf > 0)
-		printf("  RX-nombufs: %-14"PRIu64"\n", total_rx_nombuf);
-	printf("  %s++++++++++++++++++++++++++++++++++++++++++++++"
-	       "%s\n",
-	       acc_stats_border, acc_stats_border);
-#ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
-	if (total_recv > 0)
-		printf("\n  CPU cycles/packet=%u (total cycles="
-		       "%"PRIu64" / total RX packets=%"PRIu64")\n",
-		       (unsigned int)(fwd_cycles / total_recv),
-		       fwd_cycles, total_recv);
-#endif
 	printf("\nDone.\n");
 	test_done = 1;
 }
diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
index 4f4a48f..f43b1a7 100644
--- a/app/test-pmd/testpmd.h
+++ b/app/test-pmd/testpmd.h
@@ -164,19 +164,12 @@ struct rte_port {
 	struct rte_eth_conf     dev_conf;   /**< Port configuration. */
 	struct ether_addr       eth_addr;   /**< Port ethernet address */
 	struct rte_eth_stats    stats;      /**< Last port statistics */
-	uint64_t                tx_dropped; /**< If no descriptor in TX ring */
-	struct fwd_stream       *rx_stream; /**< Port RX stream, if unique */
-	struct fwd_stream       *tx_stream; /**< Port TX stream, if unique */
 	unsigned int            socket_id;  /**< For NUMA support */
 	uint16_t		parse_tunnel:1; /**< Parse internal headers */
 	uint16_t                tso_segsz;  /**< Segmentation offload MSS for non-tunneled packets. */
 	uint16_t                tunnel_tso_segsz; /**< Segmentation offload MSS for tunneled pkts. */
 	uint16_t                tx_vlan_id;/**< The tag ID */
 	uint16_t                tx_vlan_id_outer;/**< The outer tag ID */
-	uint64_t                rx_bad_ip_csum; /**< rx pkts with bad ip checksum  */
-	uint64_t                rx_bad_l4_csum; /**< rx pkts with bad l4 checksum */
-	uint64_t                rx_bad_outer_l4_csum;
-	/**< rx pkts with bad outer l4 checksum */
 	uint8_t                 tx_queue_stats_mapping_enabled;
 	uint8_t                 rx_queue_stats_mapping_enabled;
 	volatile uint16_t        port_status;    /**< port started or not */
@@ -767,6 +760,8 @@ void vlan_tpid_set(portid_t port_id, enum rte_vlan_type vlan_type,
 char *list_pkt_forwarding_retry_modes(void);
 void set_pkt_forwarding_mode(const char *fwd_mode);
 void start_packet_forwarding(int with_tx_first);
+void fwd_stats_display(void);
+void fwd_stats_reset(void);
 void stop_packet_forwarding(void);
 void dev_set_link_up(portid_t pid);
 void dev_set_link_down(portid_t pid);
diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
index 1a12da4..06c8b2a 100644
--- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
+++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
@@ -336,6 +336,42 @@ Example::
    Set rxonly packet forwarding mode
 
 
+show fwd
+~~~~~~~~
+
+When running, forwarding engines maintain statistics from the time they have been started.
+Example for the io forwarding engine, with some packet drops on the tx side::
+
+   testpmd> show fwd stats all
+
+     ------- Forward Stats for RX Port= 0/Queue= 0 -> TX Port= 1/Queue= 0 -------
+     RX-packets: 274293770      TX-packets: 274293642      TX-dropped: 128
+
+     ------- Forward Stats for RX Port= 1/Queue= 0 -> TX Port= 0/Queue= 0 -------
+     RX-packets: 274301850      TX-packets: 274301850      TX-dropped: 0
+
+     ---------------------- Forward statistics for port 0  ----------------------
+     RX-packets: 274293802      RX-dropped: 0             RX-total: 274293802
+     TX-packets: 274301862      TX-dropped: 0             TX-total: 274301862
+     ----------------------------------------------------------------------------
+
+     ---------------------- Forward statistics for port 1  ----------------------
+     RX-packets: 274301894      RX-dropped: 0             RX-total: 274301894
+     TX-packets: 274293706      TX-dropped: 128           TX-total: 274293834
+     ----------------------------------------------------------------------------
+
+     +++++++++++++++ Accumulated forward statistics for all ports+++++++++++++++
+     RX-packets: 548595696      RX-dropped: 0             RX-total: 548595696
+     TX-packets: 548595568      TX-dropped: 128           TX-total: 548595696
+     ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+clear fwd
+~~~~~~~~~
+
+Clear the forwarding engines statistics::
+
+   testpmd> clear fwd stats all
+
 read rxd
 ~~~~~~~~
 
-- 
1.8.3.1