ionic: add rx filtering for hw timestamp steering

Add handling of the new Rx packet classification filter type.
This simple bit of classification allows for steering packets
to a separate Rx queue for processing.

Signed-off-by: Allen Hubbe <allenbh@pensando.io>
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/pensando/ionic/ionic_rx_filter.c

@@ -140,6 +140,9 @@ int ionic_rx_filter_save(struct ionic_lif *lif, u32 flow_id, u16 rxq_index,
 	case IONIC_RX_FILTER_MATCH_MAC_VLAN:
 		key = le16_to_cpu(ac->mac_vlan.vlan);
 		break;
+	case IONIC_RX_FILTER_STEER_PKTCLASS:
+		key = 0;
+		break;
 	default:
 		return -EINVAL;
 	}
@@ -210,3 +213,21 @@ struct ionic_rx_filter *ionic_rx_filter_by_addr(struct ionic_lif *lif,
 
 	return NULL;
 }
+
+struct ionic_rx_filter *ionic_rx_filter_rxsteer(struct ionic_lif *lif)
+{
+	struct ionic_rx_filter *f;
+	struct hlist_head *head;
+	unsigned int key;
+
+	key = hash_32(0, IONIC_RX_FILTER_HASH_BITS);
+	head = &lif->rx_filters.by_hash[key];
+
+	hlist_for_each_entry(f, head, by_hash) {
+		if (le16_to_cpu(f->cmd.match) != IONIC_RX_FILTER_STEER_PKTCLASS)
+			continue;
+		return f;
+	}
+
+	return NULL;
+}

drivers/net/ethernet/pensando/ionic/ionic_rx_filter.h

@@ -31,5 +31,6 @@ int ionic_rx_filter_save(struct ionic_lif *lif, u32 flow_id, u16 rxq_index,
 			 u32 hash, struct ionic_admin_ctx *ctx);
 struct ionic_rx_filter *ionic_rx_filter_by_vlan(struct ionic_lif *lif, u16 vid);
 struct ionic_rx_filter *ionic_rx_filter_by_addr(struct ionic_lif *lif, const u8 *addr);
+struct ionic_rx_filter *ionic_rx_filter_rxsteer(struct ionic_lif *lif);
 
 #endif /* _IONIC_RX_FILTER_H_ */