ice: Add function to program ethertype based filter rule on VSIs

This patch adds function to program VSI with ethertype based filter rule,
so that all flow control frames would be disallowed from being transmitted
to the client, in order to prevent malicious VSI, especially VF from
sending out PAUSE or PFC frames, and then control other VSIs traffic.

Signed-off-by: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_switch.c b/drivers/net/ethernet/intel/ice/ice_switch.c
index 81f44939c859..9f1f595ae7e6 100644
--- a/drivers/net/ethernet/intel/ice/ice_switch.c
+++ b/drivers/net/ethernet/intel/ice/ice_switch.c
@@ -1970,6 +1970,65 @@ ice_add_vlan(struct ice_hw *hw, struct list_head *v_list)
 }
 
 /**
+ * ice_add_eth_mac - Add ethertype and MAC based filter rule
+ * @hw: pointer to the hardware structure
+ * @em_list: list of ether type MAC filter, MAC is optional
+ */
+enum ice_status
+ice_add_eth_mac(struct ice_hw *hw, struct list_head *em_list)
+{
+	struct ice_fltr_list_entry *em_list_itr;
+
+	if (!em_list || !hw)
+		return ICE_ERR_PARAM;
+
+	list_for_each_entry(em_list_itr, em_list, list_entry) {
+		enum ice_sw_lkup_type l_type =
+			em_list_itr->fltr_info.lkup_type;
+
+		if (l_type != ICE_SW_LKUP_ETHERTYPE_MAC &&
+		    l_type != ICE_SW_LKUP_ETHERTYPE)
+			return ICE_ERR_PARAM;
+
+		em_list_itr->fltr_info.flag = ICE_FLTR_TX;
+		em_list_itr->status = ice_add_rule_internal(hw, l_type,
+							    em_list_itr);
+		if (em_list_itr->status)
+			return em_list_itr->status;
+	}
+	return 0;
+}
+
+/**
+ * ice_remove_eth_mac - Remove an ethertype (or MAC) based filter rule
+ * @hw: pointer to the hardware structure
+ * @em_list: list of ethertype or ethertype MAC entries
+ */
+enum ice_status
+ice_remove_eth_mac(struct ice_hw *hw, struct list_head *em_list)
+{
+	struct ice_fltr_list_entry *em_list_itr, *tmp;
+
+	if (!em_list || !hw)
+		return ICE_ERR_PARAM;
+
+	list_for_each_entry_safe(em_list_itr, tmp, em_list, list_entry) {
+		enum ice_sw_lkup_type l_type =
+			em_list_itr->fltr_info.lkup_type;
+
+		if (l_type != ICE_SW_LKUP_ETHERTYPE_MAC &&
+		    l_type != ICE_SW_LKUP_ETHERTYPE)
+			return ICE_ERR_PARAM;
+
+		em_list_itr->status = ice_remove_rule_internal(hw, l_type,
+							       em_list_itr);
+		if (em_list_itr->status)
+			return em_list_itr->status;
+	}
+	return 0;
+}
+
+/**
  * ice_rem_sw_rule_info
  * @hw: pointer to the hardware structure
  * @rule_head: pointer to the switch list structure that we want to delete