nfp: extend flower add flow offload

Extends the flower flow add function by calculating which match
fields are present in the flower offload structure and allocating
the appropriate space to describe these.

Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 160 insertions, 1 deletions

diff --git a/drivers/net/ethernet/netronome/nfp/flower/offload.c b/drivers/net/ethernet/netronome/nfp/flower/offload.c
index 2fe0353292fc..fb9f73ab16c9 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/offload.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/offload.c
@@ -44,6 +44,138 @@
 #include "../nfp_net.h"
 #include "../nfp_port.h"
 
+static bool nfp_flower_check_higher_than_mac(struct tc_cls_flower_offload *f)
+{
+	return dissector_uses_key(f->dissector,
+				  FLOW_DISSECTOR_KEY_IPV4_ADDRS) ||
+		dissector_uses_key(f->dissector,
+				   FLOW_DISSECTOR_KEY_IPV6_ADDRS) ||
+		dissector_uses_key(f->dissector,
+				   FLOW_DISSECTOR_KEY_PORTS) ||
+		dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_ICMP);
+}
+
+static int
+nfp_flower_calculate_key_layers(struct nfp_fl_key_ls *ret_key_ls,
+				struct tc_cls_flower_offload *flow)
+{
+	struct flow_dissector_key_control *mask_enc_ctl;
+	struct flow_dissector_key_basic *mask_basic;
+	struct flow_dissector_key_basic *key_basic;
+	u32 key_layer_two;
+	u8 key_layer;
+	int key_size;
+
+	mask_enc_ctl = skb_flow_dissector_target(flow->dissector,
+						 FLOW_DISSECTOR_KEY_ENC_CONTROL,
+						 flow->mask);
+
+	mask_basic = skb_flow_dissector_target(flow->dissector,
+					       FLOW_DISSECTOR_KEY_BASIC,
+					       flow->mask);
+
+	key_basic = skb_flow_dissector_target(flow->dissector,
+					      FLOW_DISSECTOR_KEY_BASIC,
+					      flow->key);
+	key_layer_two = 0;
+	key_layer = NFP_FLOWER_LAYER_PORT | NFP_FLOWER_LAYER_MAC;
+	key_size = sizeof(struct nfp_flower_meta_one) +
+		   sizeof(struct nfp_flower_in_port) +
+		   sizeof(struct nfp_flower_mac_mpls);
+
+	/* We are expecting a tunnel. For now we ignore offloading. */
+	if (mask_enc_ctl->addr_type)
+		return -EOPNOTSUPP;
+
+	if (mask_basic->n_proto) {
+		/* Ethernet type is present in the key. */
+		switch (key_basic->n_proto) {
+		case cpu_to_be16(ETH_P_IP):
+			key_layer |= NFP_FLOWER_LAYER_IPV4;
+			key_size += sizeof(struct nfp_flower_ipv4);
+			break;
+
+		case cpu_to_be16(ETH_P_IPV6):
+			key_layer |= NFP_FLOWER_LAYER_IPV6;
+			key_size += sizeof(struct nfp_flower_ipv6);
+			break;
+
+		/* Currently we do not offload ARP
+		 * because we rely on it to get to the host.
+		 */
+		case cpu_to_be16(ETH_P_ARP):
+			return -EOPNOTSUPP;
+
+		/* Will be included in layer 2. */
+		case cpu_to_be16(ETH_P_8021Q):
+			break;
+
+		default:
+			/* Other ethtype - we need check the masks for the
+			 * remainder of the key to ensure we can offload.
+			 */
+			if (nfp_flower_check_higher_than_mac(flow))
+				return -EOPNOTSUPP;
+			break;
+		}
+	}
+
+	if (mask_basic->ip_proto) {
+		/* Ethernet type is present in the key. */
+		switch (key_basic->ip_proto) {
+		case IPPROTO_TCP:
+		case IPPROTO_UDP:
+		case IPPROTO_SCTP:
+		case IPPROTO_ICMP:
+		case IPPROTO_ICMPV6:
+			key_layer |= NFP_FLOWER_LAYER_TP;
+			key_size += sizeof(struct nfp_flower_tp_ports);
+			break;
+		default:
+			/* Other ip proto - we need check the masks for the
+			 * remainder of the key to ensure we can offload.
+			 */
+			return -EOPNOTSUPP;
+		}
+	}
+
+	ret_key_ls->key_layer = key_layer;
+	ret_key_ls->key_layer_two = key_layer_two;
+	ret_key_ls->key_size = key_size;
+
+	return 0;
+}
+
+static struct nfp_fl_payload *
+nfp_flower_allocate_new(struct nfp_fl_key_ls *key_layer)
+{
+	struct nfp_fl_payload *flow_pay;
+
+	flow_pay = kmalloc(sizeof(*flow_pay), GFP_KERNEL);
+	if (!flow_pay)
+		return NULL;
+
+	flow_pay->meta.key_len = key_layer->key_size;
+	flow_pay->unmasked_data = kmalloc(key_layer->key_size, GFP_KERNEL);
+	if (!flow_pay->unmasked_data)
+		goto err_free_flow;
+
+	flow_pay->meta.mask_len = key_layer->key_size;
+	flow_pay->mask_data = kmalloc(key_layer->key_size, GFP_KERNEL);
+	if (!flow_pay->mask_data)
+		goto err_free_unmasked;
+
+	flow_pay->meta.flags = 0;
+
+	return flow_pay;
+
+err_free_unmasked:
+	kfree(flow_pay->unmasked_data);
+err_free_flow:
+	kfree(flow_pay);
+	return NULL;
+}
+
 /**
  * nfp_flower_add_offload() - Adds a new flow to hardware.
  * @app:	Pointer to the APP handle
@@ -58,7 +190,34 @@ static int
 nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
 		       struct tc_cls_flower_offload *flow)
 {
-	return -EOPNOTSUPP;
+	struct nfp_fl_payload *flow_pay;
+	struct nfp_fl_key_ls *key_layer;
+	int err;
+
+	key_layer = kmalloc(sizeof(*key_layer), GFP_KERNEL);
+	if (!key_layer)
+		return -ENOMEM;
+
+	err = nfp_flower_calculate_key_layers(key_layer, flow);
+	if (err)
+		goto err_free_key_ls;
+
+	flow_pay = nfp_flower_allocate_new(key_layer);
+	if (!flow_pay) {
+		err = -ENOMEM;
+		goto err_free_key_ls;
+	}
+
+	/* TODO: Complete flower_add_offload. */
+	err = -EOPNOTSUPP;
+
+	kfree(flow_pay->mask_data);
+	kfree(flow_pay->unmasked_data);
+	kfree(flow_pay);
+
+err_free_key_ls:
+	kfree(key_layer);
+	return err;
 }
 
 /**