offload.c 46.4 KB
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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2017-2018 Netronome Systems, Inc. */
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#include <linux/skbuff.h>
#include <net/devlink.h>
#include <net/pkt_cls.h>

#include "cmsg.h"
#include "main.h"
#include "../nfpcore/nfp_cpp.h"
#include "../nfpcore/nfp_nsp.h"
#include "../nfp_app.h"
#include "../nfp_main.h"
#include "../nfp_net.h"
#include "../nfp_port.h"

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#define NFP_FLOWER_SUPPORTED_TCPFLAGS \
	(TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST | \
	 TCPHDR_PSH | TCPHDR_URG)

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#define NFP_FLOWER_SUPPORTED_CTLFLAGS \
	(FLOW_DIS_IS_FRAGMENT | \
	 FLOW_DIS_FIRST_FRAG)

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#define NFP_FLOWER_WHITELIST_DISSECTOR \
	(BIT(FLOW_DISSECTOR_KEY_CONTROL) | \
	 BIT(FLOW_DISSECTOR_KEY_BASIC) | \
	 BIT(FLOW_DISSECTOR_KEY_IPV4_ADDRS) | \
	 BIT(FLOW_DISSECTOR_KEY_IPV6_ADDRS) | \
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	 BIT(FLOW_DISSECTOR_KEY_TCP) | \
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	 BIT(FLOW_DISSECTOR_KEY_PORTS) | \
	 BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS) | \
	 BIT(FLOW_DISSECTOR_KEY_VLAN) | \
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	 BIT(FLOW_DISSECTOR_KEY_ENC_KEYID) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_PORTS) | \
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	 BIT(FLOW_DISSECTOR_KEY_ENC_OPTS) | \
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	 BIT(FLOW_DISSECTOR_KEY_ENC_IP) | \
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	 BIT(FLOW_DISSECTOR_KEY_MPLS) | \
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	 BIT(FLOW_DISSECTOR_KEY_IP))

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#define NFP_FLOWER_WHITELIST_TUN_DISSECTOR \
	(BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_KEYID) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) | \
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	 BIT(FLOW_DISSECTOR_KEY_ENC_OPTS) | \
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	 BIT(FLOW_DISSECTOR_KEY_ENC_PORTS) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_IP))
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#define NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R \
	(BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
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	 BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS))
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#define NFP_FLOWER_MERGE_FIELDS \
	(NFP_FLOWER_LAYER_PORT | \
	 NFP_FLOWER_LAYER_MAC | \
	 NFP_FLOWER_LAYER_TP | \
	 NFP_FLOWER_LAYER_IPV4 | \
	 NFP_FLOWER_LAYER_IPV6)

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#define NFP_FLOWER_PRE_TUN_RULE_FIELDS \
	(NFP_FLOWER_LAYER_PORT | \
	 NFP_FLOWER_LAYER_MAC | \
	 NFP_FLOWER_LAYER_IPV4)

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struct nfp_flower_merge_check {
	union {
		struct {
			__be16 tci;
			struct nfp_flower_mac_mpls l2;
			struct nfp_flower_tp_ports l4;
			union {
				struct nfp_flower_ipv4 ipv4;
				struct nfp_flower_ipv6 ipv6;
			};
		};
		unsigned long vals[8];
	};
};

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static int
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nfp_flower_xmit_flow(struct nfp_app *app, struct nfp_fl_payload *nfp_flow,
		     u8 mtype)
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{
	u32 meta_len, key_len, mask_len, act_len, tot_len;
	struct sk_buff *skb;
	unsigned char *msg;

	meta_len =  sizeof(struct nfp_fl_rule_metadata);
	key_len = nfp_flow->meta.key_len;
	mask_len = nfp_flow->meta.mask_len;
	act_len = nfp_flow->meta.act_len;

	tot_len = meta_len + key_len + mask_len + act_len;

	/* Convert to long words as firmware expects
	 * lengths in units of NFP_FL_LW_SIZ.
	 */
	nfp_flow->meta.key_len >>= NFP_FL_LW_SIZ;
	nfp_flow->meta.mask_len >>= NFP_FL_LW_SIZ;
	nfp_flow->meta.act_len >>= NFP_FL_LW_SIZ;

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	skb = nfp_flower_cmsg_alloc(app, tot_len, mtype, GFP_KERNEL);
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	if (!skb)
		return -ENOMEM;

	msg = nfp_flower_cmsg_get_data(skb);
	memcpy(msg, &nfp_flow->meta, meta_len);
	memcpy(&msg[meta_len], nfp_flow->unmasked_data, key_len);
	memcpy(&msg[meta_len + key_len], nfp_flow->mask_data, mask_len);
	memcpy(&msg[meta_len + key_len + mask_len],
	       nfp_flow->action_data, act_len);

	/* Convert back to bytes as software expects
	 * lengths in units of bytes.
	 */
	nfp_flow->meta.key_len <<= NFP_FL_LW_SIZ;
	nfp_flow->meta.mask_len <<= NFP_FL_LW_SIZ;
	nfp_flow->meta.act_len <<= NFP_FL_LW_SIZ;

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	nfp_ctrl_tx(app->ctrl, skb);
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	return 0;
}

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static bool nfp_flower_check_higher_than_mac(struct flow_cls_offload *f)
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{
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	struct flow_rule *rule = flow_cls_offload_flow_rule(f);
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	return flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV4_ADDRS) ||
	       flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV6_ADDRS) ||
	       flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS) ||
	       flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ICMP);
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}

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static bool nfp_flower_check_higher_than_l3(struct flow_cls_offload *f)
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{
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	struct flow_rule *rule = flow_cls_offload_flow_rule(f);
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	return flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS) ||
	       flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ICMP);
}

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static int
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nfp_flower_calc_opt_layer(struct flow_dissector_key_enc_opts *enc_opts,
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			  u32 *key_layer_two, int *key_size,
			  struct netlink_ext_ack *extack)
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{
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	if (enc_opts->len > NFP_FL_MAX_GENEVE_OPT_KEY) {
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		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: geneve options exceed maximum length");
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		return -EOPNOTSUPP;
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	}
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	if (enc_opts->len > 0) {
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		*key_layer_two |= NFP_FLOWER_LAYER2_GENEVE_OP;
		*key_size += sizeof(struct nfp_flower_geneve_options);
	}

	return 0;
}

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static int
nfp_flower_calc_udp_tun_layer(struct flow_dissector_key_ports *enc_ports,
			      struct flow_dissector_key_enc_opts *enc_op,
			      u32 *key_layer_two, u8 *key_layer, int *key_size,
			      struct nfp_flower_priv *priv,
			      enum nfp_flower_tun_type *tun_type,
			      struct netlink_ext_ack *extack)
{
	int err;

	switch (enc_ports->dst) {
	case htons(IANA_VXLAN_UDP_PORT):
		*tun_type = NFP_FL_TUNNEL_VXLAN;
		*key_layer |= NFP_FLOWER_LAYER_VXLAN;
		*key_size += sizeof(struct nfp_flower_ipv4_udp_tun);

		if (enc_op) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: encap options not supported on vxlan tunnels");
			return -EOPNOTSUPP;
		}
		break;
	case htons(GENEVE_UDP_PORT):
		if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE)) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support geneve offload");
			return -EOPNOTSUPP;
		}
		*tun_type = NFP_FL_TUNNEL_GENEVE;
		*key_layer |= NFP_FLOWER_LAYER_EXT_META;
		*key_size += sizeof(struct nfp_flower_ext_meta);
		*key_layer_two |= NFP_FLOWER_LAYER2_GENEVE;
		*key_size += sizeof(struct nfp_flower_ipv4_udp_tun);

		if (!enc_op)
			break;
		if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE_OPT)) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support geneve option offload");
			return -EOPNOTSUPP;
		}
		err = nfp_flower_calc_opt_layer(enc_op, key_layer_two,
						key_size, extack);
		if (err)
			return err;
		break;
	default:
		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: tunnel type unknown");
		return -EOPNOTSUPP;
	}

	return 0;
}

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static int
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nfp_flower_calculate_key_layers(struct nfp_app *app,
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				struct net_device *netdev,
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				struct nfp_fl_key_ls *ret_key_ls,
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				struct flow_cls_offload *flow,
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				enum nfp_flower_tun_type *tun_type,
				struct netlink_ext_ack *extack)
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{
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	struct flow_rule *rule = flow_cls_offload_flow_rule(flow);
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	struct flow_dissector *dissector = rule->match.dissector;
	struct flow_match_basic basic = { NULL, NULL};
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	struct nfp_flower_priv *priv = app->priv;
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	u32 key_layer_two;
	u8 key_layer;
	int key_size;
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	int err;
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	if (dissector->used_keys & ~NFP_FLOWER_WHITELIST_DISSECTOR) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match not supported");
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		return -EOPNOTSUPP;
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	}
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	/* If any tun dissector is used then the required set must be used. */
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	if (dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR &&
	    (dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R)
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	    != NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: tunnel match not supported");
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		return -EOPNOTSUPP;
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	}
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	key_layer_two = 0;
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	key_layer = NFP_FLOWER_LAYER_PORT;
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	key_size = sizeof(struct nfp_flower_meta_tci) +
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		   sizeof(struct nfp_flower_in_port);

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	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS) ||
	    flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_MPLS)) {
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		key_layer |= NFP_FLOWER_LAYER_MAC;
		key_size += sizeof(struct nfp_flower_mac_mpls);
	}
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	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
		struct flow_match_vlan vlan;
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		flow_rule_match_vlan(rule, &vlan);
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		if (!(priv->flower_ext_feats & NFP_FL_FEATS_VLAN_PCP) &&
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		    vlan.key->vlan_priority) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support VLAN PCP offload");
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			return -EOPNOTSUPP;
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		}
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	}

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	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_CONTROL)) {
		struct flow_match_enc_opts enc_op = { NULL, NULL };
		struct flow_match_ipv4_addrs ipv4_addrs;
		struct flow_match_control enc_ctl;
		struct flow_match_ports enc_ports;

		flow_rule_match_enc_control(rule, &enc_ctl);

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		if (enc_ctl.mask->addr_type != 0xffff) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: wildcarded protocols on tunnels are not supported");
			return -EOPNOTSUPP;
		}
		if (enc_ctl.key->addr_type != FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only IPv4 tunnels are supported");
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			return -EOPNOTSUPP;
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		}
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		/* These fields are already verified as used. */
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		flow_rule_match_enc_ipv4_addrs(rule, &ipv4_addrs);
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		if (ipv4_addrs.mask->dst != cpu_to_be32(~0)) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only an exact match IPv4 destination address is supported");
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			return -EOPNOTSUPP;
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		}
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		if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_OPTS))
			flow_rule_match_enc_opts(rule, &enc_op);
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		if (!flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
			/* check if GRE, which has no enc_ports */
			if (netif_is_gretap(netdev)) {
				*tun_type = NFP_FL_TUNNEL_GRE;
				key_layer |= NFP_FLOWER_LAYER_EXT_META;
				key_size += sizeof(struct nfp_flower_ext_meta);
				key_layer_two |= NFP_FLOWER_LAYER2_GRE;
				key_size +=
					sizeof(struct nfp_flower_ipv4_gre_tun);

				if (enc_op.key) {
					NL_SET_ERR_MSG_MOD(extack, "unsupported offload: encap options not supported on GRE tunnels");
					return -EOPNOTSUPP;
				}
			} else {
				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: an exact match on L4 destination port is required for non-GRE tunnels");
				return -EOPNOTSUPP;
			}
		} else {
			flow_rule_match_enc_ports(rule, &enc_ports);
			if (enc_ports.mask->dst != cpu_to_be16(~0)) {
				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only an exact match L4 destination port is supported");
				return -EOPNOTSUPP;
			}

			err = nfp_flower_calc_udp_tun_layer(enc_ports.key,
							    enc_op.key,
							    &key_layer_two,
							    &key_layer,
							    &key_size, priv,
							    tun_type, extack);
			if (err)
				return err;

			/* Ensure the ingress netdev matches the expected
			 * tun type.
			 */
			if (!nfp_fl_netdev_is_tunnel_type(netdev, *tun_type)) {
				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: ingress netdev does not match the expected tunnel type");
				return -EOPNOTSUPP;
			}
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		}
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	}
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	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC))
		flow_rule_match_basic(rule, &basic);
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	if (basic.mask && basic.mask->n_proto) {
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		/* Ethernet type is present in the key. */
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		switch (basic.key->n_proto) {
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		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):
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			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: ARP not supported");
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			return -EOPNOTSUPP;

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		case cpu_to_be16(ETH_P_MPLS_UC):
		case cpu_to_be16(ETH_P_MPLS_MC):
			if (!(key_layer & NFP_FLOWER_LAYER_MAC)) {
				key_layer |= NFP_FLOWER_LAYER_MAC;
				key_size += sizeof(struct nfp_flower_mac_mpls);
			}
			break;

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		/* Will be included in layer 2. */
		case cpu_to_be16(ETH_P_8021Q):
			break;

		default:
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			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on given EtherType is not supported");
			return -EOPNOTSUPP;
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		}
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	} else if (nfp_flower_check_higher_than_mac(flow)) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: cannot match above L2 without specified EtherType");
		return -EOPNOTSUPP;
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	}

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	if (basic.mask && basic.mask->ip_proto) {
		switch (basic.key->ip_proto) {
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		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;
		}
	}

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	if (!(key_layer & NFP_FLOWER_LAYER_TP) &&
	    nfp_flower_check_higher_than_l3(flow)) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: cannot match on L4 information without specified IP protocol type");
		return -EOPNOTSUPP;
	}

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	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_TCP)) {
		struct flow_match_tcp tcp;
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		u32 tcp_flags;

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		flow_rule_match_tcp(rule, &tcp);
		tcp_flags = be16_to_cpu(tcp.key->flags);
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		if (tcp_flags & ~NFP_FLOWER_SUPPORTED_TCPFLAGS) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: no match support for selected TCP flags");
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			return -EOPNOTSUPP;
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		}
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		/* We only support PSH and URG flags when either
		 * FIN, SYN or RST is present as well.
		 */
		if ((tcp_flags & (TCPHDR_PSH | TCPHDR_URG)) &&
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		    !(tcp_flags & (TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST))) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: PSH and URG is only supported when used with FIN, SYN or RST");
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			return -EOPNOTSUPP;
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		}
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		/* We need to store TCP flags in the either the IPv4 or IPv6 key
		 * space, thus we need to ensure we include a IPv4/IPv6 key
		 * layer if we have not done so already.
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		 */
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		if (!basic.key) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on TCP flags requires a match on L3 protocol");
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			return -EOPNOTSUPP;
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		}
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		if (!(key_layer & NFP_FLOWER_LAYER_IPV4) &&
		    !(key_layer & NFP_FLOWER_LAYER_IPV6)) {
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			switch (basic.key->n_proto) {
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			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):
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					key_layer |= NFP_FLOWER_LAYER_IPV6;
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				key_size += sizeof(struct nfp_flower_ipv6);
				break;

			default:
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				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on TCP flags requires a match on IPv4/IPv6");
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				return -EOPNOTSUPP;
			}
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		}
	}

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	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
		struct flow_match_control ctl;
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		flow_rule_match_control(rule, &ctl);
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		if (ctl.key->flags & ~NFP_FLOWER_SUPPORTED_CTLFLAGS) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on unknown control flag");
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			return -EOPNOTSUPP;
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		}
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	}

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	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 *
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nfp_flower_allocate_new(struct nfp_fl_key_ls *key_layer)
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{
	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;

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	flow_pay->action_data = kmalloc(NFP_FL_MAX_A_SIZ, GFP_KERNEL);
	if (!flow_pay->action_data)
		goto err_free_mask;

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	flow_pay->nfp_tun_ipv4_addr = 0;
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	flow_pay->meta.flags = 0;
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	INIT_LIST_HEAD(&flow_pay->linked_flows);
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	flow_pay->in_hw = false;
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	flow_pay->pre_tun_rule.dev = NULL;
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	return flow_pay;

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err_free_mask:
	kfree(flow_pay->mask_data);
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err_free_unmasked:
	kfree(flow_pay->unmasked_data);
err_free_flow:
	kfree(flow_pay);
	return NULL;
}

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static int
nfp_flower_update_merge_with_actions(struct nfp_fl_payload *flow,
				     struct nfp_flower_merge_check *merge,
				     u8 *last_act_id, int *act_out)
{
	struct nfp_fl_set_ipv6_tc_hl_fl *ipv6_tc_hl_fl;
	struct nfp_fl_set_ip4_ttl_tos *ipv4_ttl_tos;
	struct nfp_fl_set_ip4_addrs *ipv4_add;
	struct nfp_fl_set_ipv6_addr *ipv6_add;
	struct nfp_fl_push_vlan *push_vlan;
	struct nfp_fl_set_tport *tport;
	struct nfp_fl_set_eth *eth;
	struct nfp_fl_act_head *a;
	unsigned int act_off = 0;
	u8 act_id = 0;
	u8 *ports;
	int i;

	while (act_off < flow->meta.act_len) {
		a = (struct nfp_fl_act_head *)&flow->action_data[act_off];
		act_id = a->jump_id;

		switch (act_id) {
		case NFP_FL_ACTION_OPCODE_OUTPUT:
			if (act_out)
				(*act_out)++;
			break;
		case NFP_FL_ACTION_OPCODE_PUSH_VLAN:
			push_vlan = (struct nfp_fl_push_vlan *)a;
			if (push_vlan->vlan_tci)
				merge->tci = cpu_to_be16(0xffff);
			break;
		case NFP_FL_ACTION_OPCODE_POP_VLAN:
			merge->tci = cpu_to_be16(0);
			break;
		case NFP_FL_ACTION_OPCODE_SET_IPV4_TUNNEL:
			/* New tunnel header means l2 to l4 can be matched. */
			eth_broadcast_addr(&merge->l2.mac_dst[0]);
			eth_broadcast_addr(&merge->l2.mac_src[0]);
			memset(&merge->l4, 0xff,
			       sizeof(struct nfp_flower_tp_ports));
			memset(&merge->ipv4, 0xff,
			       sizeof(struct nfp_flower_ipv4));
			break;
		case NFP_FL_ACTION_OPCODE_SET_ETHERNET:
			eth = (struct nfp_fl_set_eth *)a;
			for (i = 0; i < ETH_ALEN; i++)
				merge->l2.mac_dst[i] |= eth->eth_addr_mask[i];
			for (i = 0; i < ETH_ALEN; i++)
				merge->l2.mac_src[i] |=
					eth->eth_addr_mask[ETH_ALEN + i];
			break;
		case NFP_FL_ACTION_OPCODE_SET_IPV4_ADDRS:
			ipv4_add = (struct nfp_fl_set_ip4_addrs *)a;
			merge->ipv4.ipv4_src |= ipv4_add->ipv4_src_mask;
			merge->ipv4.ipv4_dst |= ipv4_add->ipv4_dst_mask;
			break;
		case NFP_FL_ACTION_OPCODE_SET_IPV4_TTL_TOS:
			ipv4_ttl_tos = (struct nfp_fl_set_ip4_ttl_tos *)a;
			merge->ipv4.ip_ext.ttl |= ipv4_ttl_tos->ipv4_ttl_mask;
			merge->ipv4.ip_ext.tos |= ipv4_ttl_tos->ipv4_tos_mask;
			break;
		case NFP_FL_ACTION_OPCODE_SET_IPV6_SRC:
			ipv6_add = (struct nfp_fl_set_ipv6_addr *)a;
			for (i = 0; i < 4; i++)
				merge->ipv6.ipv6_src.in6_u.u6_addr32[i] |=
					ipv6_add->ipv6[i].mask;
			break;
		case NFP_FL_ACTION_OPCODE_SET_IPV6_DST:
			ipv6_add = (struct nfp_fl_set_ipv6_addr *)a;
			for (i = 0; i < 4; i++)
				merge->ipv6.ipv6_dst.in6_u.u6_addr32[i] |=
					ipv6_add->ipv6[i].mask;
			break;
		case NFP_FL_ACTION_OPCODE_SET_IPV6_TC_HL_FL:
			ipv6_tc_hl_fl = (struct nfp_fl_set_ipv6_tc_hl_fl *)a;
			merge->ipv6.ip_ext.ttl |=
				ipv6_tc_hl_fl->ipv6_hop_limit_mask;
			merge->ipv6.ip_ext.tos |= ipv6_tc_hl_fl->ipv6_tc_mask;
			merge->ipv6.ipv6_flow_label_exthdr |=
				ipv6_tc_hl_fl->ipv6_label_mask;
			break;
		case NFP_FL_ACTION_OPCODE_SET_UDP:
		case NFP_FL_ACTION_OPCODE_SET_TCP:
			tport = (struct nfp_fl_set_tport *)a;
			ports = (u8 *)&merge->l4.port_src;
			for (i = 0; i < 4; i++)
				ports[i] |= tport->tp_port_mask[i];
			break;
		case NFP_FL_ACTION_OPCODE_PRE_TUNNEL:
		case NFP_FL_ACTION_OPCODE_PRE_LAG:
		case NFP_FL_ACTION_OPCODE_PUSH_GENEVE:
			break;
		default:
			return -EOPNOTSUPP;
		}

		act_off += a->len_lw << NFP_FL_LW_SIZ;
	}

	if (last_act_id)
		*last_act_id = act_id;

	return 0;
}

static int
nfp_flower_populate_merge_match(struct nfp_fl_payload *flow,
				struct nfp_flower_merge_check *merge,
				bool extra_fields)
{
	struct nfp_flower_meta_tci *meta_tci;
	u8 *mask = flow->mask_data;
	u8 key_layer, match_size;

	memset(merge, 0, sizeof(struct nfp_flower_merge_check));

	meta_tci = (struct nfp_flower_meta_tci *)mask;
	key_layer = meta_tci->nfp_flow_key_layer;

	if (key_layer & ~NFP_FLOWER_MERGE_FIELDS && !extra_fields)
		return -EOPNOTSUPP;

	merge->tci = meta_tci->tci;
	mask += sizeof(struct nfp_flower_meta_tci);

	if (key_layer & NFP_FLOWER_LAYER_EXT_META)
		mask += sizeof(struct nfp_flower_ext_meta);

	mask += sizeof(struct nfp_flower_in_port);

	if (key_layer & NFP_FLOWER_LAYER_MAC) {
		match_size = sizeof(struct nfp_flower_mac_mpls);
		memcpy(&merge->l2, mask, match_size);
		mask += match_size;
	}

	if (key_layer & NFP_FLOWER_LAYER_TP) {
		match_size = sizeof(struct nfp_flower_tp_ports);
		memcpy(&merge->l4, mask, match_size);
		mask += match_size;
	}

	if (key_layer & NFP_FLOWER_LAYER_IPV4) {
		match_size = sizeof(struct nfp_flower_ipv4);
		memcpy(&merge->ipv4, mask, match_size);
	}

	if (key_layer & NFP_FLOWER_LAYER_IPV6) {
		match_size = sizeof(struct nfp_flower_ipv6);
		memcpy(&merge->ipv6, mask, match_size);
	}

	return 0;
}

static int
nfp_flower_can_merge(struct nfp_fl_payload *sub_flow1,
		     struct nfp_fl_payload *sub_flow2)
{
	/* Two flows can be merged if sub_flow2 only matches on bits that are
	 * either matched by sub_flow1 or set by a sub_flow1 action. This
	 * ensures that every packet that hits sub_flow1 and recirculates is
	 * guaranteed to hit sub_flow2.
	 */
	struct nfp_flower_merge_check sub_flow1_merge, sub_flow2_merge;
	int err, act_out = 0;
	u8 last_act_id = 0;

	err = nfp_flower_populate_merge_match(sub_flow1, &sub_flow1_merge,
					      true);
	if (err)
		return err;

	err = nfp_flower_populate_merge_match(sub_flow2, &sub_flow2_merge,
					      false);
	if (err)
		return err;

	err = nfp_flower_update_merge_with_actions(sub_flow1, &sub_flow1_merge,
						   &last_act_id, &act_out);
	if (err)
		return err;

	/* Must only be 1 output action and it must be the last in sequence. */
	if (act_out != 1 || last_act_id != NFP_FL_ACTION_OPCODE_OUTPUT)
		return -EOPNOTSUPP;

	/* Reject merge if sub_flow2 matches on something that is not matched
	 * on or set in an action by sub_flow1.
	 */
	err = bitmap_andnot(sub_flow2_merge.vals, sub_flow2_merge.vals,
			    sub_flow1_merge.vals,
			    sizeof(struct nfp_flower_merge_check) * 8);
	if (err)
		return -EINVAL;

	return 0;
}

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static unsigned int
nfp_flower_copy_pre_actions(char *act_dst, char *act_src, int len,
			    bool *tunnel_act)
{
	unsigned int act_off = 0, act_len;
	struct nfp_fl_act_head *a;
	u8 act_id = 0;

	while (act_off < len) {
		a = (struct nfp_fl_act_head *)&act_src[act_off];
		act_len = a->len_lw << NFP_FL_LW_SIZ;
		act_id = a->jump_id;

		switch (act_id) {
		case NFP_FL_ACTION_OPCODE_PRE_TUNNEL:
			if (tunnel_act)
				*tunnel_act = true;
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			/* fall through */
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		case NFP_FL_ACTION_OPCODE_PRE_LAG:
			memcpy(act_dst + act_off, act_src + act_off, act_len);
			break;
		default:
			return act_off;
		}

		act_off += act_len;
	}

	return act_off;
}

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static int
nfp_fl_verify_post_tun_acts(char *acts, int len, struct nfp_fl_push_vlan **vlan)
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{
	struct nfp_fl_act_head *a;
	unsigned int act_off = 0;

	while (act_off < len) {
		a = (struct nfp_fl_act_head *)&acts[act_off];
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		if (a->jump_id == NFP_FL_ACTION_OPCODE_PUSH_VLAN && !act_off)
			*vlan = (struct nfp_fl_push_vlan *)a;
		else if (a->jump_id != NFP_FL_ACTION_OPCODE_OUTPUT)
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			return -EOPNOTSUPP;

		act_off += a->len_lw << NFP_FL_LW_SIZ;
	}

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	/* Ensure any VLAN push also has an egress action. */
	if (*vlan && act_off <= sizeof(struct nfp_fl_push_vlan))
		return -EOPNOTSUPP;

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	return 0;
}

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static int
nfp_fl_push_vlan_after_tun(char *acts, int len, struct nfp_fl_push_vlan *vlan)
{
	struct nfp_fl_set_ipv4_tun *tun;
	struct nfp_fl_act_head *a;
	unsigned int act_off = 0;

	while (act_off < len) {
		a = (struct nfp_fl_act_head *)&acts[act_off];

		if (a->jump_id == NFP_FL_ACTION_OPCODE_SET_IPV4_TUNNEL) {
			tun = (struct nfp_fl_set_ipv4_tun *)a;
			tun->outer_vlan_tpid = vlan->vlan_tpid;
			tun->outer_vlan_tci = vlan->vlan_tci;

			return 0;
		}

		act_off += a->len_lw << NFP_FL_LW_SIZ;
	}

	/* Return error if no tunnel action is found. */
	return -EOPNOTSUPP;
}

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static int
nfp_flower_merge_action(struct nfp_fl_payload *sub_flow1,
			struct nfp_fl_payload *sub_flow2,
			struct nfp_fl_payload *merge_flow)
{
	unsigned int sub1_act_len, sub2_act_len, pre_off1, pre_off2;
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	struct nfp_fl_push_vlan *post_tun_push_vlan = NULL;
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	bool tunnel_act = false;
	char *merge_act;
	int err;

	/* The last action of sub_flow1 must be output - do not merge this. */
	sub1_act_len = sub_flow1->meta.act_len - sizeof(struct nfp_fl_output);
	sub2_act_len = sub_flow2->meta.act_len;

	if (!sub2_act_len)
		return -EINVAL;

	if (sub1_act_len + sub2_act_len > NFP_FL_MAX_A_SIZ)
		return -EINVAL;

	/* A shortcut can only be applied if there is a single action. */
	if (sub1_act_len)
		merge_flow->meta.shortcut = cpu_to_be32(NFP_FL_SC_ACT_NULL);
	else
		merge_flow->meta.shortcut = sub_flow2->meta.shortcut;

	merge_flow->meta.act_len = sub1_act_len + sub2_act_len;
	merge_act = merge_flow->action_data;

	/* Copy any pre-actions to the start of merge flow action list. */
	pre_off1 = nfp_flower_copy_pre_actions(merge_act,
					       sub_flow1->action_data,
					       sub1_act_len, &tunnel_act);
	merge_act += pre_off1;
	sub1_act_len -= pre_off1;
	pre_off2 = nfp_flower_copy_pre_actions(merge_act,
					       sub_flow2->action_data,
					       sub2_act_len, NULL);
	merge_act += pre_off2;
	sub2_act_len -= pre_off2;

	/* FW does a tunnel push when egressing, therefore, if sub_flow 1 pushes
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	 * a tunnel, there are restrictions on what sub_flow 2 actions lead to a
	 * valid merge.
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	 */
	if (tunnel_act) {
		char *post_tun_acts = &sub_flow2->action_data[pre_off2];

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		err = nfp_fl_verify_post_tun_acts(post_tun_acts, sub2_act_len,
						  &post_tun_push_vlan);
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		if (err)
			return err;
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		if (post_tun_push_vlan) {
			pre_off2 += sizeof(*post_tun_push_vlan);
			sub2_act_len -= sizeof(*post_tun_push_vlan);
		}
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	}

	/* Copy remaining actions from sub_flows 1 and 2. */
	memcpy(merge_act, sub_flow1->action_data + pre_off1, sub1_act_len);
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	if (post_tun_push_vlan) {
		/* Update tunnel action in merge to include VLAN push. */
		err = nfp_fl_push_vlan_after_tun(merge_act, sub1_act_len,
						 post_tun_push_vlan);
		if (err)
			return err;

		merge_flow->meta.act_len -= sizeof(*post_tun_push_vlan);
	}

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	merge_act += sub1_act_len;
	memcpy(merge_act, sub_flow2->action_data + pre_off2, sub2_act_len);

	return 0;
}

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/* Flow link code should only be accessed under RTNL. */
static void nfp_flower_unlink_flow(struct nfp_fl_payload_link *link)
{
	list_del(&link->merge_flow.list);
	list_del(&link->sub_flow.list);
	kfree(link);
}

static void nfp_flower_unlink_flows(struct nfp_fl_payload *merge_flow,
				    struct nfp_fl_payload *sub_flow)
{
	struct nfp_fl_payload_link *link;

	list_for_each_entry(link, &merge_flow->linked_flows, merge_flow.list)
		if (link->sub_flow.flow == sub_flow) {
			nfp_flower_unlink_flow(link);
			return;
		}
}

static int nfp_flower_link_flows(struct nfp_fl_payload *merge_flow,
				 struct nfp_fl_payload *sub_flow)
{
	struct nfp_fl_payload_link *link;

	link = kmalloc(sizeof(*link), GFP_KERNEL);
	if (!link)
		return -ENOMEM;

	link->merge_flow.flow = merge_flow;
	list_add_tail(&link->merge_flow.list, &merge_flow->linked_flows);
	link->sub_flow.flow = sub_flow;
	list_add_tail(&link->sub_flow.list, &sub_flow->linked_flows);

	return 0;
}

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/**
 * nfp_flower_merge_offloaded_flows() - Merge 2 existing flows to single flow.
 * @app:	Pointer to the APP handle
 * @sub_flow1:	Initial flow matched to produce merge hint
 * @sub_flow2:	Post recirculation flow matched in merge hint
 *
 * Combines 2 flows (if valid) to a single flow, removing the initial from hw
 * and offloading the new, merged flow.
 *
 * Return: negative value on error, 0 in success.
 */
int nfp_flower_merge_offloaded_flows(struct nfp_app *app,
				     struct nfp_fl_payload *sub_flow1,
				     struct nfp_fl_payload *sub_flow2)
{
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	struct flow_cls_offload merge_tc_off;
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	struct nfp_flower_priv *priv = app->priv;
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	struct netlink_ext_ack *extack = NULL;
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	struct nfp_fl_payload *merge_flow;
	struct nfp_fl_key_ls merge_key_ls;
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	int err;

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	ASSERT_RTNL();

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	extack = merge_tc_off.common.extack;
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	if (sub_flow1 == sub_flow2 ||
	    nfp_flower_is_merge_flow(sub_flow1) ||
	    nfp_flower_is_merge_flow(sub_flow2))
		return -EINVAL;

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	err = nfp_flower_can_merge(sub_flow1, sub_flow2);
	if (err)
		return err;

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	merge_key_ls.key_size = sub_flow1->meta.key_len;

	merge_flow = nfp_flower_allocate_new(&merge_key_ls);
	if (!merge_flow)
		return -ENOMEM;

	merge_flow->tc_flower_cookie = (unsigned long)merge_flow;
	merge_flow->ingress_dev = sub_flow1->ingress_dev;

	memcpy(merge_flow->unmasked_data, sub_flow1->unmasked_data,
	       sub_flow1->meta.key_len);
	memcpy(merge_flow->mask_data, sub_flow1->mask_data,
	       sub_flow1->meta.mask_len);

	err = nfp_flower_merge_action(sub_flow1, sub_flow2, merge_flow);
	if (err)
		goto err_destroy_merge_flow;

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	err = nfp_flower_link_flows(merge_flow, sub_flow1);
	if (err)
		goto err_destroy_merge_flow;

	err = nfp_flower_link_flows(merge_flow, sub_flow2);
	if (err)
		goto err_unlink_sub_flow1;

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	merge_tc_off.cookie = merge_flow->tc_flower_cookie;
	err = nfp_compile_flow_metadata(app, &merge_tc_off, merge_flow,
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					merge_flow->ingress_dev, extack);
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	if (err)
		goto err_unlink_sub_flow2;
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	err = rhashtable_insert_fast(&priv->flow_table, &merge_flow->fl_node,
				     nfp_flower_table_params);
	if (err)
		goto err_release_metadata;

	err = nfp_flower_xmit_flow(app, merge_flow,
				   NFP_FLOWER_CMSG_TYPE_FLOW_MOD);
	if (err)
		goto err_remove_rhash;

	merge_flow->in_hw = true;
	sub_flow1->in_hw = false;

	return 0;

err_remove_rhash:
	WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
					    &merge_flow->fl_node,
					    nfp_flower_table_params));
err_release_metadata:
	nfp_modify_flow_metadata(app, merge_flow);
err_unlink_sub_flow2:
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	nfp_flower_unlink_flows(merge_flow, sub_flow2);
err_unlink_sub_flow1:
	nfp_flower_unlink_flows(merge_flow, sub_flow1);
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err_destroy_merge_flow:
	kfree(merge_flow->action_data);
	kfree(merge_flow->mask_data);
	kfree(merge_flow->unmasked_data);
	kfree(merge_flow);
	return err;
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}

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/**
 * nfp_flower_validate_pre_tun_rule()
 * @app:	Pointer to the APP handle
 * @flow:	Pointer to NFP flow representation of rule
 * @extack:	Netlink extended ACK report
 *
 * Verifies the flow as a pre-tunnel rule.
 *
 * Return: negative value on error, 0 if verified.
 */
static int
nfp_flower_validate_pre_tun_rule(struct nfp_app *app,
				 struct nfp_fl_payload *flow,
				 struct netlink_ext_ack *extack)
{
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	struct nfp_flower_meta_tci *meta_tci;
	struct nfp_flower_mac_mpls *mac;
	struct nfp_fl_act_head *act;
	u8 *mask = flow->mask_data;
	bool vlan = false;
	int act_offset;
	u8 key_layer;

	meta_tci = (struct nfp_flower_meta_tci *)flow->unmasked_data;
	if (meta_tci->tci & cpu_to_be16(NFP_FLOWER_MASK_VLAN_PRESENT)) {
		u16 vlan_tci = be16_to_cpu(meta_tci->tci);

		vlan_tci &= ~NFP_FLOWER_MASK_VLAN_PRESENT;
		flow->pre_tun_rule.vlan_tci = cpu_to_be16(vlan_tci);
		vlan = true;
	} else {
		flow->pre_tun_rule.vlan_tci = cpu_to_be16(0xffff);
	}

	key_layer = meta_tci->nfp_flow_key_layer;
	if (key_layer & ~NFP_FLOWER_PRE_TUN_RULE_FIELDS) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: too many match fields");
		return -EOPNOTSUPP;
	}

	if (!(key_layer & NFP_FLOWER_LAYER_MAC)) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: MAC fields match required");
		return -EOPNOTSUPP;
	}

	/* Skip fields known to exist. */
	mask += sizeof(struct nfp_flower_meta_tci);
	mask += sizeof(struct nfp_flower_in_port);

	/* Ensure destination MAC address is fully matched. */
	mac = (struct nfp_flower_mac_mpls *)mask;
	if (!is_broadcast_ether_addr(&mac->mac_dst[0])) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: dest MAC field must not be masked");
		return -EOPNOTSUPP;
	}

	if (key_layer & NFP_FLOWER_LAYER_IPV4) {
		int ip_flags = offsetof(struct nfp_flower_ipv4, ip_ext.flags);
		int ip_proto = offsetof(struct nfp_flower_ipv4, ip_ext.proto);
		int i;

		mask += sizeof(struct nfp_flower_mac_mpls);

		/* Ensure proto and flags are the only IP layer fields. */
		for (i = 0; i < sizeof(struct nfp_flower_ipv4); i++)
			if (mask[i] && i != ip_flags && i != ip_proto) {
				NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: only flags and proto can be matched in ip header");
				return -EOPNOTSUPP;
			}
	}

	/* Action must be a single egress or pop_vlan and egress. */
	act_offset = 0;
	act = (struct nfp_fl_act_head *)&flow->action_data[act_offset];
	if (vlan) {
		if (act->jump_id != NFP_FL_ACTION_OPCODE_POP_VLAN) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: match on VLAN must have VLAN pop as first action");
			return -EOPNOTSUPP;
		}

		act_offset += act->len_lw << NFP_FL_LW_SIZ;
		act = (struct nfp_fl_act_head *)&flow->action_data[act_offset];
	}

	if (act->jump_id != NFP_FL_ACTION_OPCODE_OUTPUT) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: non egress action detected where egress was expected");
		return -EOPNOTSUPP;
	}

	act_offset += act->len_lw << NFP_FL_LW_SIZ;

	/* Ensure there are no more actions after egress. */
	if (act_offset != flow->meta.act_len) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: egress is not the last action");
		return -EOPNOTSUPP;
	}

	return 0;
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}

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/**
 * nfp_flower_add_offload() - Adds a new flow to hardware.
 * @app:	Pointer to the APP handle
 * @netdev:	netdev structure.
 * @flow:	TC flower classifier offload structure.
 *
 * Adds a new flow to the repeated hash structure and action payload.
 *
 * Return: negative value on error, 0 if configured successfully.
 */
static int
nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
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		       struct flow_cls_offload *flow)
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{
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	enum nfp_flower_tun_type tun_type = NFP_FL_TUNNEL_NONE;
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	struct nfp_flower_priv *priv = app->priv;
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	struct netlink_ext_ack *extack = NULL;
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	struct nfp_fl_payload *flow_pay;
	struct nfp_fl_key_ls *key_layer;
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	struct nfp_port *port = NULL;
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	int err;

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	extack = flow->common.extack;
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	if (nfp_netdev_is_nfp_repr(netdev))
		port = nfp_port_from_netdev(netdev);

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	key_layer = kmalloc(sizeof(*key_layer), GFP_KERNEL);
	if (!key_layer)
		return -ENOMEM;

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	err = nfp_flower_calculate_key_layers(app, netdev, key_layer, flow,
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					      &tun_type, extack);
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	if (err)
		goto err_free_key_ls;

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	flow_pay = nfp_flower_allocate_new(key_layer);
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	if (!flow_pay) {
		err = -ENOMEM;
		goto err_free_key_ls;
	}

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	err = nfp_flower_compile_flow_match(app, flow, key_layer, netdev,
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					    flow_pay, tun_type, extack);
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	if (err)
		goto err_destroy_flow;

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	err = nfp_flower_compile_action(app, flow, netdev, flow_pay, extack);
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	if (err)
		goto err_destroy_flow;

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	if (flow_pay->pre_tun_rule.dev) {
		err = nfp_flower_validate_pre_tun_rule(app, flow_pay, extack);
		if (err)
			goto err_destroy_flow;
	}

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	err = nfp_compile_flow_metadata(app, flow, flow_pay, netdev, extack);
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	if (err)
		goto err_destroy_flow;

	flow_pay->tc_flower_cookie = flow->cookie;
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	err = rhashtable_insert_fast(&priv->flow_table, &flow_pay->fl_node,
				     nfp_flower_table_params);
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	if (err) {
		NL_SET_ERR_MSG_MOD(extack, "invalid entry: cannot insert flow into tables for offloads");
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		goto err_release_metadata;
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	}
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	if (flow_pay->pre_tun_rule.dev)
		err = nfp_flower_xmit_pre_tun_flow(app, flow_pay);
	else
		err = nfp_flower_xmit_flow(app, flow_pay,
					   NFP_FLOWER_CMSG_TYPE_FLOW_ADD);
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	if (err)
		goto err_remove_rhash;
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	if (port)
		port->tc_offload_cnt++;
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John Hurley committed
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	flow_pay->in_hw = true;

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	/* Deallocate flow payload when flower rule has been destroyed. */
	kfree(key_layer);

	return 0;
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err_remove_rhash:
	WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
					    &flow_pay->fl_node,
					    nfp_flower_table_params));
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err_release_metadata:
	nfp_modify_flow_metadata(app, flow_pay);
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err_destroy_flow:
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	kfree(flow_pay->action_data);
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	kfree(flow_pay->mask_data);
	kfree(flow_pay->unmasked_data);
	kfree(flow_pay);
err_free_key_ls:
	kfree(key_layer);
	return err;
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}

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static void
nfp_flower_remove_merge_flow(struct nfp_app *app,
			     struct nfp_fl_payload *del_sub_flow,
			     struct nfp_fl_payload *merge_flow)
{
	struct nfp_flower_priv *priv = app->priv;
	struct nfp_fl_payload_link *link, *temp;
	struct nfp_fl_payload *origin;
	bool mod = false;
	int err;

	link = list_first_entry(&merge_flow->linked_flows,
				struct nfp_fl_payload_link, merge_flow.list);
	origin = link->sub_flow.flow;

	/* Re-add rule the merge had overwritten if it has not been deleted. */
	if (origin != del_sub_flow)
		mod = true;

	err = nfp_modify_flow_metadata(app, merge_flow);
	if (err) {
		nfp_flower_cmsg_warn(app, "Metadata fail for merge flow delete.\n");
		goto err_free_links;
	}

	if (!mod) {
		err = nfp_flower_xmit_flow(app, merge_flow,