[dpdk-dev] [PATCH] app/testpmd: add parameter to start forwarding sending

[Pablo de Lara <pablo.de.lara.guarch@intel.com>]

Add parameter to start forwarding sending first
a burst of packets, which is useful when testing
a loopback connection.

This was already implemented as an internal command,
but adding it as a parameter is interesting, as it
allows the user to test a loopback connection without
entering in the internal command line.

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
---
 app/test-pmd/parameters.c             | 5 +++++
 app/test-pmd/testpmd.c                | 5 +++--
 app/test-pmd/testpmd.h                | 1 +
 doc/guides/testpmd_app_ug/run_app.rst | 4 ++++
 4 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/app/test-pmd/parameters.c b/app/test-pmd/parameters.c
index fbe6284..0da4172 100644
--- a/app/test-pmd/parameters.c
+++ b/app/test-pmd/parameters.c
@@ -89,6 +89,7 @@ usage(char* progname)
 	       "[--cmdline-file=FILENAME] "
 #endif
 	       "[--help|-h] | [--auto-start|-a] | ["
+	       "--tx-first"
 	       "--coremask=COREMASK --portmask=PORTMASK --numa "
 	       "--mbuf-size= | --total-num-mbufs= | "
 	       "--nb-cores= | --nb-ports= | "
@@ -674,6 +675,10 @@ launch_args_parse(int argc, char** argv)
 				printf("Auto-start selected\n");
 				auto_start = 1;
 			}
+			if (!strcmp(lgopts[opt_idx].name, "tx-first")) {
+				printf("Start TX first\n");
+				tx_first = 1;
+			}
 			if (!strcmp(lgopts[opt_idx].name,
 				    "eth-peers-configfile")) {
 				if (init_peer_eth_addrs(optarg) != 0)
diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index d1041af..39a1225 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -95,6 +95,7 @@ uint16_t verbose_level = 0; /**< Silent by default. */
 /* use master core for command line ? */
 uint8_t interactive = 0;
 uint8_t auto_start = 0;
+uint8_t tx_first;
 char cmdline_filename[PATH_MAX] = {0};
 
 /*
@@ -2339,7 +2340,7 @@ main(int argc, char** argv)
 	if (interactive == 1) {
 		if (auto_start) {
 			printf("Start automatic packet forwarding\n");
-			start_packet_forwarding(0);
+			start_packet_forwarding(tx_first);
 		}
 		prompt();
 		pmd_test_exit();
@@ -2350,7 +2351,7 @@ main(int argc, char** argv)
 		int rc;
 
 		printf("No commandline core given, start packet forwarding\n");
-		start_packet_forwarding(0);
+		start_packet_forwarding(tx_first);
 		printf("Press enter to exit\n");
 		rc = read(0, &c, 1);
 		pmd_test_exit();
diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
index e6c43ba..348aa66 100644
--- a/app/test-pmd/testpmd.h
+++ b/app/test-pmd/testpmd.h
@@ -299,6 +299,7 @@ extern uint16_t nb_rx_queue_stats_mappings;
 extern uint16_t verbose_level; /**< Drives messages being displayed, if any. */
 extern uint8_t  interactive;
 extern uint8_t  auto_start;
+extern uint8_t  tx_first;
 extern char cmdline_filename[PATH_MAX]; /**< offline commands file */
 extern uint8_t  numa_support; /**< set by "--numa" parameter */
 extern uint16_t port_topology; /**< set by "--port-topology" parameter */
diff --git a/doc/guides/testpmd_app_ug/run_app.rst b/doc/guides/testpmd_app_ug/run_app.rst
index 2a43214..4171fcb 100644
--- a/doc/guides/testpmd_app_ug/run_app.rst
+++ b/doc/guides/testpmd_app_ug/run_app.rst
@@ -188,6 +188,10 @@ The commandline options are:
 
     Start forwarding on initialization.
 
+*   ``--tx-first``
+
+    Start forwarding, after sending a burst of packets first.
+
 *   ``--nb-cores=N``
 
     Set the number of forwarding cores,
-- 
2.7.4