sfc: offload left-hand side rules for conntrack

Handle the (comparatively) simple case of a -trk rule on an efx netdev
 (i.e. not a tunnel decap rule) with ct and goto chain actions.
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/bitfield.h

@@ -26,6 +26,8 @@
 /* Lowest bit numbers and widths */
 #define EFX_DUMMY_FIELD_LBN 0
 #define EFX_DUMMY_FIELD_WIDTH 0
+#define EFX_BYTE_0_LBN 0
+#define EFX_BYTE_0_WIDTH 8
 #define EFX_WORD_0_LBN 0
 #define EFX_WORD_0_WIDTH 16
 #define EFX_WORD_1_LBN 16

drivers/net/ethernet/sfc/mae.h

@@ -84,6 +84,9 @@ int efx_mae_get_caps(struct efx_nic *efx, struct mae_caps *caps);
 int efx_mae_match_check_caps(struct efx_nic *efx,
 			     const struct efx_tc_match_fields *mask,
 			     struct netlink_ext_ack *extack);
+int efx_mae_match_check_caps_lhs(struct efx_nic *efx,
+				 const struct efx_tc_match_fields *mask,
+				 struct netlink_ext_ack *extack);
 int efx_mae_check_encap_match_caps(struct efx_nic *efx, bool ipv6,
 				   u8 ip_tos_mask, __be16 udp_sport_mask,
 				   struct netlink_ext_ack *extack);
@@ -112,6 +115,9 @@ int efx_mae_register_encap_match(struct efx_nic *efx,
 				 struct efx_tc_encap_match *encap);
 int efx_mae_unregister_encap_match(struct efx_nic *efx,
 				   struct efx_tc_encap_match *encap);
+int efx_mae_insert_lhs_rule(struct efx_nic *efx, struct efx_tc_lhs_rule *rule,
+			    u32 prio);
+int efx_mae_remove_lhs_rule(struct efx_nic *efx, struct efx_tc_lhs_rule *rule);
 struct efx_tc_ct_entry; /* see tc_conntrack.h */
 int efx_mae_insert_ct(struct efx_nic *efx, struct efx_tc_ct_entry *conn);
 int efx_mae_remove_ct(struct efx_nic *efx, struct efx_tc_ct_entry *conn);

drivers/net/ethernet/sfc/mcdi.h

@@ -218,6 +218,12 @@ void efx_mcdi_sensor_event(struct efx_nic *efx, efx_qword_t *ev);
 	BUILD_BUG_ON(_field ## _LEN != 1);				\
 	*(u8 *)MCDI_STRUCT_PTR(_buf, _field) = _value;			\
 	} while (0)
+#define MCDI_STRUCT_POPULATE_BYTE_1(_buf, _field, _name, _value) do {	\
+	efx_dword_t _temp;						\
+	EFX_POPULATE_DWORD_1(_temp, _name, _value);			\
+	MCDI_STRUCT_SET_BYTE(_buf, _field,				\
+			     EFX_DWORD_FIELD(_temp, EFX_BYTE_0));	\
+	} while (0)
 #define MCDI_BYTE(_buf, _field)						\
 	((void)BUILD_BUG_ON_ZERO(MC_CMD_ ## _field ## _LEN != 1),	\
 	 *MCDI_PTR(_buf, _field))

drivers/net/ethernet/sfc/tc.h

@@ -140,6 +140,12 @@ struct efx_tc_action_set_list {
 	u32 fw_id;
 };
 
+struct efx_tc_lhs_action {
+	struct efx_tc_recirc_id *rid;
+	struct efx_tc_ct_zone *zone;
+	struct efx_tc_counter_index *count;
+};
+
 struct efx_tc_flow_rule {
 	unsigned long cookie;
 	struct rhash_head linkage;
@@ -149,6 +155,14 @@ struct efx_tc_flow_rule {
 	u32 fw_id;
 };
 
+struct efx_tc_lhs_rule {
+	unsigned long cookie;
+	struct efx_tc_match match;
+	struct efx_tc_lhs_action lhs_act;
+	struct rhash_head linkage;
+	u32 fw_id;
+};
+
 enum efx_tc_rule_prios {
 	EFX_TC_PRIO_TC, /* Rule inserted by TC */
 	EFX_TC_PRIO_DFLT, /* Default switch rule; one of efx_tc_default_rules */
@@ -208,6 +222,7 @@ struct efx_tc_table_ct { /* TABLE_ID_CONNTRACK_TABLE */
  * @encap_ht: Hashtable of TC encap actions
  * @encap_match_ht: Hashtable of TC encap matches
  * @match_action_ht: Hashtable of TC match-action rules
+ * @lhs_rule_ht: Hashtable of TC left-hand (act ct & goto chain) rules
  * @ct_zone_ht: Hashtable of TC conntrack flowtable bindings
  * @ct_ht: Hashtable of TC conntrack flow entries
  * @neigh_ht: Hashtable of neighbour watches (&struct efx_neigh_binder)
@@ -244,6 +259,7 @@ struct efx_tc_state {
 	struct rhashtable encap_ht;
 	struct rhashtable encap_match_ht;
 	struct rhashtable match_action_ht;
+	struct rhashtable lhs_rule_ht;
 	struct rhashtable ct_zone_ht;
 	struct rhashtable ct_ht;
 	struct rhashtable neigh_ht;