This patch adds "--disable-flow-flush" parameter, which could used to
disable port flow flush when stop port. It allows testing keep flow
rules or shared flow objects across restart.

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
---
 app/test-pmd/parameters.c             | 4 ++++
 app/test-pmd/testpmd.c                | 7 ++++++-
 app/test-pmd/testpmd.h                | 1 +
 doc/guides/testpmd_app_ug/run_app.rst | 5 +++++
 4 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/app/test-pmd/parameters.c b/app/test-pmd/parameters.c
index d597c209ba..e734ad9a02 100644
--- a/app/test-pmd/parameters.c
+++ b/app/test-pmd/parameters.c
@@ -175,6 +175,7 @@ usage(char* progname)
 	       "disable print of designated event or all of them.\n");
 	printf("  --flow-isolate-all: "
 	       "requests flow API isolated mode on all ports at initialization time.\n");
+	printf("  --disable-flow-flush: disable port flow flush when stop port.\n");
 	printf("  --tx-offloads=0xXXXXXXXX: hexadecimal bitmask of TX queue offloads\n");
 	printf("  --rx-offloads=0xXXXXXXXX: hexadecimal bitmask of RX queue offloads\n");
 	printf("  --hot-plug: enable hot plug for device.\n");
@@ -667,6 +668,7 @@ launch_args_parse(int argc, char** argv)
 		{ "rxfreet",                    1, 0, 0 },
 		{ "no-flush-rx",	0, 0, 0 },
 		{ "flow-isolate-all",	        0, 0, 0 },
+		{ "disable-flow-flush",         0, 0, 0 },
 		{ "rxoffs",			1, 0, 0 },
 		{ "rxpkts",			1, 0, 0 },
 		{ "rxhdrs",			1, 0, 0 },
@@ -1330,6 +1332,8 @@ launch_args_parse(int argc, char** argv)
 				rmv_interrupt = 0;
 			if (!strcmp(lgopts[opt_idx].name, "flow-isolate-all"))
 				flow_isolate_all = 1;
+			if (!strcmp(lgopts[opt_idx].name, "disable-flow-flush"))
+				no_flow_flush = 1;
 			if (!strcmp(lgopts[opt_idx].name, "tx-offloads")) {
 				char *end = NULL;
 				n = strtoull(optarg, &end, 16);
diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 134d79a555..ea78f8982d 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -383,6 +383,11 @@ uint8_t no_flush_rx = 0; /* flush by default */
  */
 uint8_t flow_isolate_all;
 
+/*
+ * Disable port flow flush when stop port.
+ */
+uint8_t no_flow_flush = 0; /* do flow flush by default */
+
 /*
  * Avoids to check link status when starting/stopping a port.
  */
@@ -3246,7 +3251,7 @@ stop_port(portid_t pid)
 			}
 		}
 
-		if (port->flow_list)
+		if (port->flow_list && !no_flow_flush)
 			port_flow_flush(pi);

In case stop_port() is called through pmd_test_exit(), should the flag
be disabled for flush to happen.

 
 		ret = eth_dev_stop_mp(pi);
diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
index 7d24d25970..ab4733522d 100644
--- a/app/test-pmd/testpmd.h
+++ b/app/test-pmd/testpmd.h
@@ -476,6 +476,7 @@ extern uint8_t  numa_support; /**< set by "--numa" parameter */
 extern uint16_t port_topology; /**< set by "--port-topology" parameter */
 extern uint8_t no_flush_rx; /**<set by "--no-flush-rx" parameter */
 extern uint8_t flow_isolate_all; /**< set by "--flow-isolate-all */
+extern uint8_t no_flow_flush; /**< set by "--disable-flow-flush" parameter */
 extern uint8_t  mp_alloc_type;
 /**< set by "--mp-anon" or "--mp-alloc" parameter */
 extern uint32_t eth_link_speed;
diff --git a/doc/guides/testpmd_app_ug/run_app.rst b/doc/guides/testpmd_app_ug/run_app.rst
index 074f910fc9..3ec3d4f5e6 100644
--- a/doc/guides/testpmd_app_ug/run_app.rst
+++ b/doc/guides/testpmd_app_ug/run_app.rst
@@ -436,6 +436,11 @@ The command line options are:
 
     Ports that do not support this mode are automatically discarded.
 
+*   ``--disable-flow-flush``
+
+    Disable port flow flush when stop port. This allows testing keep flow rules
+    or shared flow objects across restart.
+
 *   ``--tx-offloads=0xXXXXXXXX``
 
     Set the hexadecimal bitmask of TX queue offloads.