diff --git a/app/test-pmd/cmdline_flow.c b/app/test-pmd/cmdline_flow.c
index 1432498a3..a9888cacf 100644
--- a/app/test-pmd/cmdline_flow.c
+++ b/app/test-pmd/cmdline_flow.c
@@ -251,6 +251,10 @@ enum index {
 	ACTION_SET_IPV6_SRC_IPV6_SRC,
 	ACTION_SET_IPV6_DST,
 	ACTION_SET_IPV6_DST_IPV6_DST,
+	ACTION_SET_TP_SRC,
+	ACTION_SET_TP_SRC_TP_SRC,
+	ACTION_SET_TP_DST,
+	ACTION_SET_TP_DST_TP_DST,
 };
 
 /** Maximum size for pattern in struct rte_flow_item_raw. */
@@ -828,6 +832,8 @@ static const enum index next_action[] = {
 	ACTION_SET_IPV4_DST,
 	ACTION_SET_IPV6_SRC,
 	ACTION_SET_IPV6_DST,
+	ACTION_SET_TP_SRC,
+	ACTION_SET_TP_DST,
 	ZERO,
 };
 
@@ -954,6 +960,18 @@ static const enum index action_set_ipv6_dst[] = {
 	ZERO,
 };
 
+static const enum index action_set_tp_src[] = {
+	ACTION_SET_TP_SRC_TP_SRC,
+	ACTION_NEXT,
+	ZERO,
+};
+
+static const enum index action_set_tp_dst[] = {
+	ACTION_SET_TP_DST_TP_DST,
+	ACTION_NEXT,
+	ZERO,
+};
+
 static const enum index action_jump[] = {
 	ACTION_JUMP_GROUP,
 	ACTION_NEXT,
@@ -2574,6 +2592,40 @@ static const struct token token_list[] = {
 			(struct rte_flow_action_set_ipv6, ipv6_addr)),
 		.call = parse_vc_conf,
 	},
+	[ACTION_SET_TP_SRC] = {
+		.name = "set_tp_src",
+		.help = "set a new source port number in the outermost"
+			" TCP/UDP header",
+		.priv = PRIV_ACTION(SET_TP_SRC,
+			sizeof(struct rte_flow_action_set_tp)),
+		.next = NEXT(action_set_tp_src),
+		.call = parse_vc,
+	},
+	[ACTION_SET_TP_SRC_TP_SRC] = {
+		.name = "port",
+		.help = "new source port number to set",
+		.next = NEXT(action_set_tp_src, NEXT_ENTRY(UNSIGNED)),
+		.args = ARGS(ARGS_ENTRY_HTON
+			     (struct rte_flow_action_set_tp, port)),
+		.call = parse_vc_conf,
+	},
+	[ACTION_SET_TP_DST] = {
+		.name = "set_tp_dst",
+		.help = "set a new destination port number in the outermost"
+			" TCP/UDP header",
+		.priv = PRIV_ACTION(SET_TP_DST,
+			sizeof(struct rte_flow_action_set_tp)),
+		.next = NEXT(action_set_tp_dst),
+		.call = parse_vc,
+	},
+	[ACTION_SET_TP_DST_TP_DST] = {
+		.name = "port",
+		.help = "new destination port number to set",
+		.next = NEXT(action_set_tp_dst, NEXT_ENTRY(UNSIGNED)),
+		.args = ARGS(ARGS_ENTRY_HTON
+			     (struct rte_flow_action_set_tp, port)),
+		.call = parse_vc_conf,
+	},
 };
 
 /** Remove and return last entry from argument stack. */
diff --git a/doc/guides/prog_guide/rte_flow.rst b/doc/guides/prog_guide/rte_flow.rst
index 9272cd710..1c81a824d 100644
--- a/doc/guides/prog_guide/rte_flow.rst
+++ b/doc/guides/prog_guide/rte_flow.rst
@@ -2148,6 +2148,42 @@ Otherwise, RTE_FLOW_ERROR_TYPE_ACTION error will be returned.
    | ``ipv6_addr`` | new IPv6 destination address |
    +---------------+------------------------------+
 
+Action: ``SET_TP_SRC``
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Set a new source port number in the outermost TCP/UDP header.
+
+It must be used with a valid RTE_FLOW_ITEM_TYPE_TCP or RTE_FLOW_ITEM_TYPE_UDP
+flow pattern item. Otherwise, RTE_FLOW_ERROR_TYPE_ACTION error will be returned.
+
+.. _table_rte_flow_action_set_tp_src:
+
+.. table:: SET_TP_SRC
+
+   +----------+-------------------------+
+   | Field    | Value                   |
+   +==========+=========================+
+   | ``port`` | new TCP/UDP source port |
+   +---------------+--------------------+
+
+Action: ``SET_TP_DST``
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Set a new destination port number in the outermost TCP/UDP header.
+
+It must be used with a valid RTE_FLOW_ITEM_TYPE_TCP or RTE_FLOW_ITEM_TYPE_UDP
+flow pattern item. Otherwise, RTE_FLOW_ERROR_TYPE_ACTION error will be returned.
+
+.. _table_rte_flow_action_set_tp_dst:
+
+.. table:: SET_TP_DST
+
+   +----------+------------------------------+
+   | Field    | Value                        |
+   +==========+==============================+
+   | ``port`` | new TCP/UDP destination port |
+   +---------------+-------------------------+
+
 Negative types
 ~~~~~~~~~~~~~~
 
diff --git a/doc/guides/rel_notes/release_18_11.rst b/doc/guides/rel_notes/release_18_11.rst
index 12b99de37..2b4808226 100644
--- a/doc/guides/rel_notes/release_18_11.rst
+++ b/doc/guides/rel_notes/release_18_11.rst
@@ -136,6 +136,8 @@ New Features
 
   * Modify source and destination IP addresses in the outermost IPv4/IPv6
     headers.
+  * Modify source and destination port numbers in the outermost TCP/UDP
+    headers.
 
 API Changes
 -----------
diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
index 97d91f066..ffec7013b 100644
--- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
+++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
@@ -3722,6 +3722,16 @@ This section lists supported actions and their attributes, if any.
 
   - ``ipv6_addr``: New IPv6 destination address.
 
+- ``of_set_tp_src``: Set a new source port number in the outermost TCP/UDP
+  header.
+
+  - ``port``: New TCP/UDP source port number.
+
+- ``of_set_tp_dst``: Set a new destination port number in the outermost TCP/UDP
+  header.
+
+  - ``port``: New TCP/UDP destination port number.
+
 Destroying flow rules
 ~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/lib/librte_ethdev/rte_flow.c b/lib/librte_ethdev/rte_flow.c
index 9440b63a9..4eeb392b6 100644
--- a/lib/librte_ethdev/rte_flow.c
+++ b/lib/librte_ethdev/rte_flow.c
@@ -131,6 +131,10 @@ static const struct rte_flow_desc_data rte_flow_desc_action[] = {
 		       sizeof(struct rte_flow_action_set_ipv6)),
 	MK_FLOW_ACTION(SET_IPV6_DST,
 		       sizeof(struct rte_flow_action_set_ipv6)),
+	MK_FLOW_ACTION(SET_TP_SRC,
+		       sizeof(struct rte_flow_action_set_tp)),
+	MK_FLOW_ACTION(SET_TP_DST,
+		       sizeof(struct rte_flow_action_set_tp)),
 };
 
 static int
diff --git a/lib/librte_ethdev/rte_flow.h b/lib/librte_ethdev/rte_flow.h
index 81fa73442..ce2021641 100644
--- a/lib/librte_ethdev/rte_flow.h
+++ b/lib/librte_ethdev/rte_flow.h
@@ -1546,6 +1546,28 @@ enum rte_flow_action_type {
 	 * See struct rte_flow_action_set_ipv6.
 	 */
 	RTE_FLOW_ACTION_TYPE_SET_IPV6_DST,
+
+	/**
+	 * Modify source port number in the outermost TCP/UDP header.
+	 *
+	 * If flow pattern does not define a valid RTE_FLOW_ITEM_TYPE_TCP
+	 * or RTE_FLOW_ITEM_TYPE_UDP, then the PMD should return a
+	 * RTE_FLOW_ERROR_TYPE_ACTION error.
+	 *
+	 * See struct rte_flow_action_set_tp.
+	 */
+	RTE_FLOW_ACTION_TYPE_SET_TP_SRC,
+
+	/**
+	 * Modify destination port number in the outermost TCP/UDP header.
+	 *
+	 * If flow pattern does not define a valid RTE_FLOW_ITEM_TYPE_TCP
+	 * or RTE_FLOW_ITEM_TYPE_UDP, then the PMD should return a
+	 * RTE_FLOW_ERROR_TYPE_ACTION error.
+	 *
+	 * See struct rte_flow_action_set_tp.
+	 */
+	RTE_FLOW_ACTION_TYPE_SET_TP_DST,
 };
 
 /**
@@ -1939,6 +1961,21 @@ struct rte_flow_action_set_ipv6 {
 	uint8_t ipv6_addr[16];
 };
 
+/**
+ * @warning
+ * @b EXPERIMENTAL: this structure may change without prior notice
+ *
+ * RTE_FLOW_ACTION_TYPE_SET_TP_SRC
+ * RTE_FLOW_ACTION_TYPE_SET_TP_DST
+ *
+ * Allows modification of source (RTE_FLOW_ACTION_TYPE_SET_TP_SRC)
+ * and destination (RTE_FLOW_ACTION_TYPE_SET_TP_DST) port numbers
+ * in the specified outermost TCP/UDP header.
+ */
+struct rte_flow_action_set_tp {
+	uint16_t port;
+};
+
 /*
  * Definition of a single action.
  *
