[2/4] app/testpmd: add CLIs for single flow dump feature

diff --git a/app/test-pmd/cmdline_flow.c b/app/test-pmd/cmdline_flow.c
index 49d9f9c..7f53b83 100644
--- a/app/test-pmd/cmdline_flow.c
+++ b/app/test-pmd/cmdline_flow.c
@@ -108,6 +108,10 @@  enum index {
 	TUNNEL_SET,
 	TUNNEL_MATCH,
 
+	/* Dump arguments */
+	DUMP_ALL,
+	DUMP_ONE,
+
 	/* Shared action arguments */
 	SHARED_ACTION_CREATE,
 	SHARED_ACTION_UPDATE,
@@ -791,6 +795,8 @@  struct buffer {
 		} destroy; /**< Destroy arguments. */
 		struct {
 			char file[128];
+			bool mode;
+			uint32_t rule;
 		} dump; /**< Dump arguments. */
 		struct {
 			uint32_t rule;
@@ -842,6 +848,12 @@  struct parse_action_priv {
 	ZERO,
 };
 
+static const enum index next_dump_subcmd[] = {
+	DUMP_ALL,
+	DUMP_ONE,
+	ZERO,
+};
+
 static const enum index next_sa_subcmd[] = {
 	SHARED_ACTION_CREATE,
 	SHARED_ACTION_UPDATE,
@@ -2028,10 +2040,9 @@  static int comp_set_modify_field_id(struct context *, const struct token *,
 	},
 	[DUMP] = {
 		.name = "dump",
-		.help = "dump all flow rules to file",
-		.next = NEXT(next_dump_attr, NEXT_ENTRY(PORT_ID)),
-		.args = ARGS(ARGS_ENTRY(struct buffer, args.dump.file),
-			     ARGS_ENTRY(struct buffer, port)),
+		.help = "dump single/all flow rules to file",
+		.next = NEXT(next_dump_subcmd, NEXT_ENTRY(PORT_ID)),
+		.args = ARGS(ARGS_ENTRY(struct buffer, port)),
 		.call = parse_dump,
 	},
 	[QUERY] = {
@@ -2121,6 +2132,22 @@  static int comp_set_modify_field_id(struct context *, const struct token *,
 		.args = ARGS(ARGS_ENTRY_PTR(struct buffer, args.destroy.rule)),
 		.call = parse_destroy,
 	},
+	/* Dump arguments. */
+	[DUMP_ALL] = {
+		.name = "all",
+		.help = "dump all",
+		.next = NEXT(next_dump_attr),
+		.args = ARGS(ARGS_ENTRY(struct buffer, args.dump.file)),
+		.call = parse_dump,
+	},
+	[DUMP_ONE] = {
+		.name = "rule",
+		.help = "dump one rule",
+		.next = NEXT(next_dump_attr, NEXT_ENTRY(RULE_ID)),
+		.args = ARGS(ARGS_ENTRY(struct buffer, args.dump.file),
+				ARGS_ENTRY(struct buffer, args.dump.rule)),
+		.call = parse_dump,
+	},
 	/* Query arguments. */
 	[QUERY_ACTION] = {
 		.name = "{action}",
@@ -6342,8 +6369,20 @@  static int comp_set_modify_field_id(struct context *, const struct token *,
 		ctx->objdata = 0;
 		ctx->object = out;
 		ctx->objmask = NULL;
+		return len;
+	}
+	switch (ctx->curr) {
+	case DUMP_ALL:
+	case DUMP_ONE:
+		out->args.dump.mode = (ctx->curr == DUMP_ALL) ? true : false;
+		out->command = ctx->curr;
+		ctx->objdata = 0;
+		ctx->object = out;
+		ctx->objmask = NULL;
+		return len;
+	default:
+		return -1;
 	}
-	return len;
 }
 
 /** Parse tokens for query command. */
@@ -7637,8 +7676,10 @@  static int comp_set_modify_field_id(struct context *, const struct token *,
 	case FLUSH:
 		port_flow_flush(in->port);
 		break;
-	case DUMP:
-		port_flow_dump(in->port, in->args.dump.file);
+	case DUMP_ONE:
+	case DUMP_ALL:
+		port_flow_dump(in->port, in->args.dump.mode,
+				in->args.dump.rule, in->args.dump.file);
 		break;
 	case QUERY:
 		port_flow_query(in->port, in->args.query.rule,
diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 576d5ac..c6e54b6 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -1915,13 +1915,41 @@  struct rte_flow_shared_action *
 	return ret;
 }
 
-/** Dump all flow rules. */
+/** Dump flow rules. */
 int
-port_flow_dump(portid_t port_id, const char *file_name)
+port_flow_dump(portid_t port_id, bool dump_all, uint32_t rule_id,
+		const char *file_name)
 {
 	int ret = 0;
 	FILE *file = stdout;
 	struct rte_flow_error error;
+	struct rte_port *port;
+	struct port_flow *pflow;
+	struct rte_flow *tmpFlow = NULL;
+	bool found = false;
+
+	if (port_id_is_invalid(port_id, ENABLED_WARN) ||
+		port_id == (portid_t)RTE_PORT_ALL)
+		return -EINVAL;
+
+	if (!dump_all) {
+		port = &ports[port_id];
+		pflow = port->flow_list;
+		while (pflow) {
+			if (rule_id != pflow->id) {
+				pflow = pflow->next;
+			} else {
+				tmpFlow = pflow->flow;
+				if (tmpFlow)
+					found = true;
+				break;
+			}
+		}
+		if (found == false) {
+			printf("Failed to dump to flow %d\n", rule_id);
+			return -EINVAL;
+		}
+	}
 
 	if (file_name && strlen(file_name)) {
 		file = fopen(file_name, "w");
@@ -1931,7 +1959,11 @@  struct rte_flow_shared_action *
 			return -errno;
 		}
 	}
-	ret = rte_flow_dev_dump(port_id, file, &error);
+	if (!dump_all)
+		ret = rte_flow_dump(port_id, tmpFlow, file, &error);
+	else
+		ret = rte_flow_dev_dump(port_id, file, &error);
+
 	if (ret) {
 		port_flow_complain(&error);
 		printf("Failed to dump flow: %s\n", strerror(-ret));
diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
index ce83f31..3dcbac1 100644
--- a/app/test-pmd/testpmd.h
+++ b/app/test-pmd/testpmd.h
@@ -824,7 +824,8 @@  void update_age_action_context(const struct rte_flow_action *actions,
 		     struct port_flow *pf);
 int port_flow_destroy(portid_t port_id, uint32_t n, const uint32_t *rule);
 int port_flow_flush(portid_t port_id);
-int port_flow_dump(portid_t port_id, const char *file_name);
+int port_flow_dump(portid_t port_id, bool dump_all,
+			uint32_t rule, const char *file_name);
 int port_flow_query(portid_t port_id, uint32_t rule,
 		    const struct rte_flow_action *action);
 void port_flow_list(portid_t port_id, uint32_t n, const uint32_t *group);
diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
index f59eb8a..278e1ea 100644
--- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
+++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
@@ -3314,7 +3314,11 @@  following sections.
 
 - Dump internal representation information of all flows in hardware::
 
-   flow dump {port_id} {output_file}
+   flow dump {port_id} all {output_file}
+
+   for one flow :
+
+   flow dump {port_id} rule {rule_id} {output_file}
 
 - List and destroy aged flow rules::