offload.c

   1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
   2/* Copyright (C) 2017-2018 Netronome Systems, Inc. */
   3
   4#include <linux/skbuff.h>
   5#include <net/devlink.h>
   6#include <net/pkt_cls.h>
   7
   8#include "cmsg.h"
   9#include "main.h"
  10#include "conntrack.h"
  11#include "../nfpcore/nfp_cpp.h"
  12#include "../nfpcore/nfp_nsp.h"
  13#include "../nfp_app.h"
  14#include "../nfp_main.h"
  15#include "../nfp_net.h"
  16#include "../nfp_port.h"
  17
  18#define NFP_FLOWER_SUPPORTED_TCPFLAGS \
  19	(TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST | \
  20	 TCPHDR_PSH | TCPHDR_URG)
  21
  22#define NFP_FLOWER_SUPPORTED_CTLFLAGS \
  23	(FLOW_DIS_IS_FRAGMENT | \
  24	 FLOW_DIS_FIRST_FRAG)
  25
  26#define NFP_FLOWER_WHITELIST_DISSECTOR \
  27	(BIT_ULL(FLOW_DISSECTOR_KEY_CONTROL) | \
  28	 BIT_ULL(FLOW_DISSECTOR_KEY_BASIC) | \
  29	 BIT_ULL(FLOW_DISSECTOR_KEY_IPV4_ADDRS) | \
  30	 BIT_ULL(FLOW_DISSECTOR_KEY_IPV6_ADDRS) | \
  31	 BIT_ULL(FLOW_DISSECTOR_KEY_TCP) | \
  32	 BIT_ULL(FLOW_DISSECTOR_KEY_PORTS) | \
  33	 BIT_ULL(FLOW_DISSECTOR_KEY_ETH_ADDRS) | \
  34	 BIT_ULL(FLOW_DISSECTOR_KEY_VLAN) | \
  35	 BIT_ULL(FLOW_DISSECTOR_KEY_CVLAN) | \
  36	 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_KEYID) | \
  37	 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) | \
  38	 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) | \
  39	 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
  40	 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_PORTS) | \
  41	 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_OPTS) | \
  42	 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IP) | \
  43	 BIT_ULL(FLOW_DISSECTOR_KEY_MPLS) | \
  44	 BIT_ULL(FLOW_DISSECTOR_KEY_CT) | \
  45	 BIT_ULL(FLOW_DISSECTOR_KEY_META) | \
  46	 BIT_ULL(FLOW_DISSECTOR_KEY_IP))
  47
  48#define NFP_FLOWER_WHITELIST_TUN_DISSECTOR \
  49	(BIT_ULL(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
  50	 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_KEYID) | \
  51	 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) | \
  52	 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) | \
  53	 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_OPTS) | \
  54	 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_PORTS) | \
  55	 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IP))
  56
  57#define NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R \
  58	(BIT_ULL(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
  59	 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS))
  60
  61#define NFP_FLOWER_WHITELIST_TUN_DISSECTOR_V6_R \
  62	(BIT_ULL(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
  63	 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS))
  64
  65#define NFP_FLOWER_MERGE_FIELDS \
  66	(NFP_FLOWER_LAYER_PORT | \
  67	 NFP_FLOWER_LAYER_MAC | \
  68	 NFP_FLOWER_LAYER_TP | \
  69	 NFP_FLOWER_LAYER_IPV4 | \
  70	 NFP_FLOWER_LAYER_IPV6)
  71
  72#define NFP_FLOWER_PRE_TUN_RULE_FIELDS \
  73	(NFP_FLOWER_LAYER_EXT_META | \
  74	 NFP_FLOWER_LAYER_PORT | \
  75	 NFP_FLOWER_LAYER_MAC | \
  76	 NFP_FLOWER_LAYER_IPV4 | \
  77	 NFP_FLOWER_LAYER_IPV6)
  78
  79struct nfp_flower_merge_check {
  80	union {
  81		struct {
  82			__be16 tci;
  83			struct nfp_flower_mac_mpls l2;
  84			struct nfp_flower_tp_ports l4;
  85			union {
  86				struct nfp_flower_ipv4 ipv4;
  87				struct nfp_flower_ipv6 ipv6;
  88			};
  89		};
  90		unsigned long vals[8];
  91	};
  92};
  93
  94int
  95nfp_flower_xmit_flow(struct nfp_app *app, struct nfp_fl_payload *nfp_flow,
  96		     u8 mtype)
  97{
  98	u32 meta_len, key_len, mask_len, act_len, tot_len;
  99	struct sk_buff *skb;
 100	unsigned char *msg;
 101
 102	meta_len =  sizeof(struct nfp_fl_rule_metadata);
 103	key_len = nfp_flow->meta.key_len;
 104	mask_len = nfp_flow->meta.mask_len;
 105	act_len = nfp_flow->meta.act_len;
 106
 107	tot_len = meta_len + key_len + mask_len + act_len;
 108
 109	/* Convert to long words as firmware expects
 110	 * lengths in units of NFP_FL_LW_SIZ.
 111	 */
 112	nfp_flow->meta.key_len >>= NFP_FL_LW_SIZ;
 113	nfp_flow->meta.mask_len >>= NFP_FL_LW_SIZ;
 114	nfp_flow->meta.act_len >>= NFP_FL_LW_SIZ;
 115
 116	skb = nfp_flower_cmsg_alloc(app, tot_len, mtype, GFP_KERNEL);
 117	if (!skb)
 118		return -ENOMEM;
 119
 120	msg = nfp_flower_cmsg_get_data(skb);
 121	memcpy(msg, &nfp_flow->meta, meta_len);
 122	memcpy(&msg[meta_len], nfp_flow->unmasked_data, key_len);
 123	memcpy(&msg[meta_len + key_len], nfp_flow->mask_data, mask_len);
 124	memcpy(&msg[meta_len + key_len + mask_len],
 125	       nfp_flow->action_data, act_len);
 126
 127	/* Convert back to bytes as software expects
 128	 * lengths in units of bytes.
 129	 */
 130	nfp_flow->meta.key_len <<= NFP_FL_LW_SIZ;
 131	nfp_flow->meta.mask_len <<= NFP_FL_LW_SIZ;
 132	nfp_flow->meta.act_len <<= NFP_FL_LW_SIZ;
 133
 134	nfp_ctrl_tx(app->ctrl, skb);
 135
 136	return 0;
 137}
 138
 139static bool nfp_flower_check_higher_than_mac(struct flow_rule *rule)
 140{
 141	return flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV4_ADDRS) ||
 142	       flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV6_ADDRS) ||
 143	       flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS) ||
 144	       flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ICMP);
 145}
 146
 147static bool nfp_flower_check_higher_than_l3(struct flow_rule *rule)
 148{
 149	return flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS) ||
 150	       flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ICMP);
 151}
 152
 153static int
 154nfp_flower_calc_opt_layer(struct flow_dissector_key_enc_opts *enc_opts,
 155			  u32 *key_layer_two, int *key_size, bool ipv6,
 156			  struct netlink_ext_ack *extack)
 157{
 158	if (enc_opts->len > NFP_FL_MAX_GENEVE_OPT_KEY ||
 159	    (ipv6 && enc_opts->len > NFP_FL_MAX_GENEVE_OPT_KEY_V6)) {
 160		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: geneve options exceed maximum length");
 161		return -EOPNOTSUPP;
 162	}
 163
 164	if (enc_opts->len > 0) {
 165		*key_layer_two |= NFP_FLOWER_LAYER2_GENEVE_OP;
 166		*key_size += sizeof(struct nfp_flower_geneve_options);
 167	}
 168
 169	return 0;
 170}
 171
 172static int
 173nfp_flower_calc_udp_tun_layer(struct flow_dissector_key_ports *enc_ports,
 174			      struct flow_dissector_key_enc_opts *enc_op,
 175			      u32 *key_layer_two, u8 *key_layer, int *key_size,
 176			      struct nfp_flower_priv *priv,
 177			      enum nfp_flower_tun_type *tun_type, bool ipv6,
 178			      struct netlink_ext_ack *extack)
 179{
 180	int err;
 181
 182	switch (enc_ports->dst) {
 183	case htons(IANA_VXLAN_UDP_PORT):
 184		*tun_type = NFP_FL_TUNNEL_VXLAN;
 185		*key_layer |= NFP_FLOWER_LAYER_VXLAN;
 186
 187		if (ipv6) {
 188			*key_layer |= NFP_FLOWER_LAYER_EXT_META;
 189			*key_size += sizeof(struct nfp_flower_ext_meta);
 190			*key_layer_two |= NFP_FLOWER_LAYER2_TUN_IPV6;
 191			*key_size += sizeof(struct nfp_flower_ipv6_udp_tun);
 192		} else {
 193			*key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 194		}
 195
 196		if (enc_op) {
 197			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: encap options not supported on vxlan tunnels");
 198			return -EOPNOTSUPP;
 199		}
 200		break;
 201	case htons(GENEVE_UDP_PORT):
 202		if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE)) {
 203			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support geneve offload");
 204			return -EOPNOTSUPP;
 205		}
 206		*tun_type = NFP_FL_TUNNEL_GENEVE;
 207		*key_layer |= NFP_FLOWER_LAYER_EXT_META;
 208		*key_size += sizeof(struct nfp_flower_ext_meta);
 209		*key_layer_two |= NFP_FLOWER_LAYER2_GENEVE;
 210
 211		if (ipv6) {
 212			*key_layer_two |= NFP_FLOWER_LAYER2_TUN_IPV6;
 213			*key_size += sizeof(struct nfp_flower_ipv6_udp_tun);
 214		} else {
 215			*key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 216		}
 217
 218		if (!enc_op)
 219			break;
 220		if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE_OPT)) {
 221			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support geneve option offload");
 222			return -EOPNOTSUPP;
 223		}
 224		err = nfp_flower_calc_opt_layer(enc_op, key_layer_two, key_size,
 225						ipv6, extack);
 226		if (err)
 227			return err;
 228		break;
 229	default:
 230		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: tunnel type unknown");
 231		return -EOPNOTSUPP;
 232	}
 233
 234	return 0;
 235}
 236
 237int
 238nfp_flower_calculate_key_layers(struct nfp_app *app,
 239				struct net_device *netdev,
 240				struct nfp_fl_key_ls *ret_key_ls,
 241				struct flow_rule *rule,
 242				enum nfp_flower_tun_type *tun_type,
 243				struct netlink_ext_ack *extack)
 244{
 245	struct flow_dissector *dissector = rule->match.dissector;
 246	struct flow_match_basic basic = { NULL, NULL};
 247	struct nfp_flower_priv *priv = app->priv;
 248	u32 key_layer_two;
 249	u8 key_layer;
 250	int key_size;
 251	int err;
 252
 253	if (dissector->used_keys & ~NFP_FLOWER_WHITELIST_DISSECTOR) {
 254		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match not supported");
 255		return -EOPNOTSUPP;
 256	}
 257
 258	/* If any tun dissector is used then the required set must be used. */
 259	if (dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR &&
 260	    (dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR_V6_R)
 261	    != NFP_FLOWER_WHITELIST_TUN_DISSECTOR_V6_R &&
 262	    (dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R)
 263	    != NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R) {
 264		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: tunnel match not supported");
 265		return -EOPNOTSUPP;
 266	}
 267
 268	key_layer_two = 0;
 269	key_layer = NFP_FLOWER_LAYER_PORT;
 270	key_size = sizeof(struct nfp_flower_meta_tci) +
 271		   sizeof(struct nfp_flower_in_port);
 272
 273	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS) ||
 274	    flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_MPLS)) {
 275		key_layer |= NFP_FLOWER_LAYER_MAC;
 276		key_size += sizeof(struct nfp_flower_mac_mpls);
 277	}
 278
 279	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
 280		struct flow_match_vlan vlan;
 281
 282		flow_rule_match_vlan(rule, &vlan);
 283		if (!(priv->flower_ext_feats & NFP_FL_FEATS_VLAN_PCP) &&
 284		    vlan.key->vlan_priority) {
 285			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support VLAN PCP offload");
 286			return -EOPNOTSUPP;
 287		}
 288		if (priv->flower_ext_feats & NFP_FL_FEATS_VLAN_QINQ &&
 289		    !(key_layer_two & NFP_FLOWER_LAYER2_QINQ)) {
 290			key_layer |= NFP_FLOWER_LAYER_EXT_META;
 291			key_size += sizeof(struct nfp_flower_ext_meta);
 292			key_size += sizeof(struct nfp_flower_vlan);
 293			key_layer_two |= NFP_FLOWER_LAYER2_QINQ;
 294		}
 295	}
 296
 297	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CVLAN)) {
 298		struct flow_match_vlan cvlan;
 299
 300		if (!(priv->flower_ext_feats & NFP_FL_FEATS_VLAN_QINQ)) {
 301			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support VLAN QinQ offload");
 302			return -EOPNOTSUPP;
 303		}
 304
 305		flow_rule_match_vlan(rule, &cvlan);
 306		if (!(key_layer_two & NFP_FLOWER_LAYER2_QINQ)) {
 307			key_layer |= NFP_FLOWER_LAYER_EXT_META;
 308			key_size += sizeof(struct nfp_flower_ext_meta);
 309			key_size += sizeof(struct nfp_flower_vlan);
 310			key_layer_two |= NFP_FLOWER_LAYER2_QINQ;
 311		}
 312	}
 313
 314	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_CONTROL)) {
 315		struct flow_match_enc_opts enc_op = { NULL, NULL };
 316		struct flow_match_ipv4_addrs ipv4_addrs;
 317		struct flow_match_ipv6_addrs ipv6_addrs;
 318		struct flow_match_control enc_ctl;
 319		struct flow_match_ports enc_ports;
 320		bool ipv6_tun = false;
 321
 322		flow_rule_match_enc_control(rule, &enc_ctl);
 323
 324		if (flow_rule_has_enc_control_flags(enc_ctl.mask->flags,
 325						    extack))
 326			return -EOPNOTSUPP;
 327
 328		if (enc_ctl.mask->addr_type != 0xffff) {
 329			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: wildcarded protocols on tunnels are not supported");
 330			return -EOPNOTSUPP;
 331		}
 332
 333		ipv6_tun = enc_ctl.key->addr_type ==
 334				FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 335		if (ipv6_tun &&
 336		    !(priv->flower_ext_feats & NFP_FL_FEATS_IPV6_TUN)) {
 337			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: firmware does not support IPv6 tunnels");
 338			return -EOPNOTSUPP;
 339		}
 340
 341		if (!ipv6_tun &&
 342		    enc_ctl.key->addr_type != FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
 343			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: tunnel address type not IPv4 or IPv6");
 344			return -EOPNOTSUPP;
 345		}
 346
 347		if (ipv6_tun) {
 348			flow_rule_match_enc_ipv6_addrs(rule, &ipv6_addrs);
 349			if (memchr_inv(&ipv6_addrs.mask->dst, 0xff,
 350				       sizeof(ipv6_addrs.mask->dst))) {
 351				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only an exact match IPv6 destination address is supported");
 352				return -EOPNOTSUPP;
 353			}
 354		} else {
 355			flow_rule_match_enc_ipv4_addrs(rule, &ipv4_addrs);
 356			if (ipv4_addrs.mask->dst != cpu_to_be32(~0)) {
 357				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only an exact match IPv4 destination address is supported");
 358				return -EOPNOTSUPP;
 359			}
 360		}
 361
 362		if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_OPTS))
 363			flow_rule_match_enc_opts(rule, &enc_op);
 364
 365		if (!flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
 366			/* Check if GRE, which has no enc_ports */
 367			if (!netif_is_gretap(netdev) && !netif_is_ip6gretap(netdev)) {
 368				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: an exact match on L4 destination port is required for non-GRE tunnels");
 369				return -EOPNOTSUPP;
 370			}
 371
 372			*tun_type = NFP_FL_TUNNEL_GRE;
 373			key_layer |= NFP_FLOWER_LAYER_EXT_META;
 374			key_size += sizeof(struct nfp_flower_ext_meta);
 375			key_layer_two |= NFP_FLOWER_LAYER2_GRE;
 376
 377			if (ipv6_tun) {
 378				key_layer_two |= NFP_FLOWER_LAYER2_TUN_IPV6;
 379				key_size +=
 380					sizeof(struct nfp_flower_ipv6_gre_tun);
 381			} else {
 382				key_size +=
 383					sizeof(struct nfp_flower_ipv4_gre_tun);
 384			}
 385
 386			if (enc_op.key) {
 387				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: encap options not supported on GRE tunnels");
 388				return -EOPNOTSUPP;
 389			}
 390		} else {
 391			flow_rule_match_enc_ports(rule, &enc_ports);
 392			if (enc_ports.mask->dst != cpu_to_be16(~0)) {
 393				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only an exact match L4 destination port is supported");
 394				return -EOPNOTSUPP;
 395			}
 396
 397			err = nfp_flower_calc_udp_tun_layer(enc_ports.key,
 398							    enc_op.key,
 399							    &key_layer_two,
 400							    &key_layer,
 401							    &key_size, priv,
 402							    tun_type, ipv6_tun,
 403							    extack);
 404			if (err)
 405				return err;
 406
 407			/* Ensure the ingress netdev matches the expected
 408			 * tun type.
 409			 */
 410			if (!nfp_fl_netdev_is_tunnel_type(netdev, *tun_type)) {
 411				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: ingress netdev does not match the expected tunnel type");
 412				return -EOPNOTSUPP;
 413			}
 414		}
 415	}
 416
 417	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC))
 418		flow_rule_match_basic(rule, &basic);
 419
 420	if (basic.mask && basic.mask->n_proto) {
 421		/* Ethernet type is present in the key. */
 422		switch (basic.key->n_proto) {
 423		case cpu_to_be16(ETH_P_IP):
 424			key_layer |= NFP_FLOWER_LAYER_IPV4;
 425			key_size += sizeof(struct nfp_flower_ipv4);
 426			break;
 427
 428		case cpu_to_be16(ETH_P_IPV6):
 429			key_layer |= NFP_FLOWER_LAYER_IPV6;
 430			key_size += sizeof(struct nfp_flower_ipv6);
 431			break;
 432
 433		/* Currently we do not offload ARP
 434		 * because we rely on it to get to the host.
 435		 */
 436		case cpu_to_be16(ETH_P_ARP):
 437			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: ARP not supported");
 438			return -EOPNOTSUPP;
 439
 440		case cpu_to_be16(ETH_P_MPLS_UC):
 441		case cpu_to_be16(ETH_P_MPLS_MC):
 442			if (!(key_layer & NFP_FLOWER_LAYER_MAC)) {
 443				key_layer |= NFP_FLOWER_LAYER_MAC;
 444				key_size += sizeof(struct nfp_flower_mac_mpls);
 445			}
 446			break;
 447
 448		/* Will be included in layer 2. */
 449		case cpu_to_be16(ETH_P_8021Q):
 450			break;
 451
 452		default:
 453			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on given EtherType is not supported");
 454			return -EOPNOTSUPP;
 455		}
 456	} else if (nfp_flower_check_higher_than_mac(rule)) {
 457		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: cannot match above L2 without specified EtherType");
 458		return -EOPNOTSUPP;
 459	}
 460
 461	if (basic.mask && basic.mask->ip_proto) {
 462		switch (basic.key->ip_proto) {
 463		case IPPROTO_TCP:
 464		case IPPROTO_UDP:
 465		case IPPROTO_SCTP:
 466		case IPPROTO_ICMP:
 467		case IPPROTO_ICMPV6:
 468			key_layer |= NFP_FLOWER_LAYER_TP;
 469			key_size += sizeof(struct nfp_flower_tp_ports);
 470			break;
 471		}
 472	}
 473
 474	if (!(key_layer & NFP_FLOWER_LAYER_TP) &&
 475	    nfp_flower_check_higher_than_l3(rule)) {
 476		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: cannot match on L4 information without specified IP protocol type");
 477		return -EOPNOTSUPP;
 478	}
 479
 480	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_TCP)) {
 481		struct flow_match_tcp tcp;
 482		u32 tcp_flags;
 483
 484		flow_rule_match_tcp(rule, &tcp);
 485		tcp_flags = be16_to_cpu(tcp.key->flags);
 486
 487		if (tcp_flags & ~NFP_FLOWER_SUPPORTED_TCPFLAGS) {
 488			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: no match support for selected TCP flags");
 489			return -EOPNOTSUPP;
 490		}
 491
 492		/* We only support PSH and URG flags when either
 493		 * FIN, SYN or RST is present as well.
 494		 */
 495		if ((tcp_flags & (TCPHDR_PSH | TCPHDR_URG)) &&
 496		    !(tcp_flags & (TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST))) {
 497			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: PSH and URG is only supported when used with FIN, SYN or RST");
 498			return -EOPNOTSUPP;
 499		}
 500
 501		/* We need to store TCP flags in the either the IPv4 or IPv6 key
 502		 * space, thus we need to ensure we include a IPv4/IPv6 key
 503		 * layer if we have not done so already.
 504		 */
 505		if (!basic.key) {
 506			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on TCP flags requires a match on L3 protocol");
 507			return -EOPNOTSUPP;
 508		}
 509
 510		if (!(key_layer & NFP_FLOWER_LAYER_IPV4) &&
 511		    !(key_layer & NFP_FLOWER_LAYER_IPV6)) {
 512			switch (basic.key->n_proto) {
 513			case cpu_to_be16(ETH_P_IP):
 514				key_layer |= NFP_FLOWER_LAYER_IPV4;
 515				key_size += sizeof(struct nfp_flower_ipv4);
 516				break;
 517
 518			case cpu_to_be16(ETH_P_IPV6):
 519					key_layer |= NFP_FLOWER_LAYER_IPV6;
 520				key_size += sizeof(struct nfp_flower_ipv6);
 521				break;
 522
 523			default:
 524				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on TCP flags requires a match on IPv4/IPv6");
 525				return -EOPNOTSUPP;
 526			}
 527		}
 528	}
 529
 530	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
 531		struct flow_match_control ctl;
 532
 533		flow_rule_match_control(rule, &ctl);
 534
 535		if (!flow_rule_is_supp_control_flags(NFP_FLOWER_SUPPORTED_CTLFLAGS,
 536						     ctl.mask->flags, extack))
 537			return -EOPNOTSUPP;
 538	}
 539
 540	ret_key_ls->key_layer = key_layer;
 541	ret_key_ls->key_layer_two = key_layer_two;
 542	ret_key_ls->key_size = key_size;
 543
 544	return 0;
 545}
 546
 547struct nfp_fl_payload *
 548nfp_flower_allocate_new(struct nfp_fl_key_ls *key_layer)
 549{
 550	struct nfp_fl_payload *flow_pay;
 551
 552	flow_pay = kmalloc(sizeof(*flow_pay), GFP_KERNEL);
 553	if (!flow_pay)
 554		return NULL;
 555
 556	flow_pay->meta.key_len = key_layer->key_size;
 557	flow_pay->unmasked_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 558	if (!flow_pay->unmasked_data)
 559		goto err_free_flow;
 560
 561	flow_pay->meta.mask_len = key_layer->key_size;
 562	flow_pay->mask_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 563	if (!flow_pay->mask_data)
 564		goto err_free_unmasked;
 565
 566	flow_pay->action_data = kmalloc(NFP_FL_MAX_A_SIZ, GFP_KERNEL);
 567	if (!flow_pay->action_data)
 568		goto err_free_mask;
 569
 570	flow_pay->nfp_tun_ipv4_addr = 0;
 571	flow_pay->nfp_tun_ipv6 = NULL;
 572	flow_pay->meta.flags = 0;
 573	INIT_LIST_HEAD(&flow_pay->linked_flows);
 574	flow_pay->in_hw = false;
 575	flow_pay->pre_tun_rule.dev = NULL;
 576
 577	return flow_pay;
 578
 579err_free_mask:
 580	kfree(flow_pay->mask_data);
 581err_free_unmasked:
 582	kfree(flow_pay->unmasked_data);
 583err_free_flow:
 584	kfree(flow_pay);
 585	return NULL;
 586}
 587
 588static int
 589nfp_flower_update_merge_with_actions(struct nfp_fl_payload *flow,
 590				     struct nfp_flower_merge_check *merge,
 591				     u8 *last_act_id, int *act_out)
 592{
 593	struct nfp_fl_set_ipv6_tc_hl_fl *ipv6_tc_hl_fl;
 594	struct nfp_fl_set_ip4_ttl_tos *ipv4_ttl_tos;
 595	struct nfp_fl_set_ip4_addrs *ipv4_add;
 596	struct nfp_fl_set_ipv6_addr *ipv6_add;
 597	struct nfp_fl_push_vlan *push_vlan;
 598	struct nfp_fl_pre_tunnel *pre_tun;
 599	struct nfp_fl_set_tport *tport;
 600	struct nfp_fl_set_eth *eth;
 601	struct nfp_fl_act_head *a;
 602	unsigned int act_off = 0;
 603	bool ipv6_tun = false;
 604	u8 act_id = 0;
 605	u8 *ports;
 606	int i;
 607
 608	while (act_off < flow->meta.act_len) {
 609		a = (struct nfp_fl_act_head *)&flow->action_data[act_off];
 610		act_id = a->jump_id;
 611
 612		switch (act_id) {
 613		case NFP_FL_ACTION_OPCODE_OUTPUT:
 614			if (act_out)
 615				(*act_out)++;
 616			break;
 617		case NFP_FL_ACTION_OPCODE_PUSH_VLAN:
 618			push_vlan = (struct nfp_fl_push_vlan *)a;
 619			if (push_vlan->vlan_tci)
 620				merge->tci = cpu_to_be16(0xffff);
 621			break;
 622		case NFP_FL_ACTION_OPCODE_POP_VLAN:
 623			merge->tci = cpu_to_be16(0);
 624			break;
 625		case NFP_FL_ACTION_OPCODE_SET_TUNNEL:
 626			/* New tunnel header means l2 to l4 can be matched. */
 627			eth_broadcast_addr(&merge->l2.mac_dst[0]);
 628			eth_broadcast_addr(&merge->l2.mac_src[0]);
 629			memset(&merge->l4, 0xff,
 630			       sizeof(struct nfp_flower_tp_ports));
 631			if (ipv6_tun)
 632				memset(&merge->ipv6, 0xff,
 633				       sizeof(struct nfp_flower_ipv6));
 634			else
 635				memset(&merge->ipv4, 0xff,
 636				       sizeof(struct nfp_flower_ipv4));
 637			break;
 638		case NFP_FL_ACTION_OPCODE_SET_ETHERNET:
 639			eth = (struct nfp_fl_set_eth *)a;
 640			for (i = 0; i < ETH_ALEN; i++)
 641				merge->l2.mac_dst[i] |= eth->eth_addr_mask[i];
 642			for (i = 0; i < ETH_ALEN; i++)
 643				merge->l2.mac_src[i] |=
 644					eth->eth_addr_mask[ETH_ALEN + i];
 645			break;
 646		case NFP_FL_ACTION_OPCODE_SET_IPV4_ADDRS:
 647			ipv4_add = (struct nfp_fl_set_ip4_addrs *)a;
 648			merge->ipv4.ipv4_src |= ipv4_add->ipv4_src_mask;
 649			merge->ipv4.ipv4_dst |= ipv4_add->ipv4_dst_mask;
 650			break;
 651		case NFP_FL_ACTION_OPCODE_SET_IPV4_TTL_TOS:
 652			ipv4_ttl_tos = (struct nfp_fl_set_ip4_ttl_tos *)a;
 653			merge->ipv4.ip_ext.ttl |= ipv4_ttl_tos->ipv4_ttl_mask;
 654			merge->ipv4.ip_ext.tos |= ipv4_ttl_tos->ipv4_tos_mask;
 655			break;
 656		case NFP_FL_ACTION_OPCODE_SET_IPV6_SRC:
 657			ipv6_add = (struct nfp_fl_set_ipv6_addr *)a;
 658			for (i = 0; i < 4; i++)
 659				merge->ipv6.ipv6_src.in6_u.u6_addr32[i] |=
 660					ipv6_add->ipv6[i].mask;
 661			break;
 662		case NFP_FL_ACTION_OPCODE_SET_IPV6_DST:
 663			ipv6_add = (struct nfp_fl_set_ipv6_addr *)a;
 664			for (i = 0; i < 4; i++)
 665				merge->ipv6.ipv6_dst.in6_u.u6_addr32[i] |=
 666					ipv6_add->ipv6[i].mask;
 667			break;
 668		case NFP_FL_ACTION_OPCODE_SET_IPV6_TC_HL_FL:
 669			ipv6_tc_hl_fl = (struct nfp_fl_set_ipv6_tc_hl_fl *)a;
 670			merge->ipv6.ip_ext.ttl |=
 671				ipv6_tc_hl_fl->ipv6_hop_limit_mask;
 672			merge->ipv6.ip_ext.tos |= ipv6_tc_hl_fl->ipv6_tc_mask;
 673			merge->ipv6.ipv6_flow_label_exthdr |=
 674				ipv6_tc_hl_fl->ipv6_label_mask;
 675			break;
 676		case NFP_FL_ACTION_OPCODE_SET_UDP:
 677		case NFP_FL_ACTION_OPCODE_SET_TCP:
 678			tport = (struct nfp_fl_set_tport *)a;
 679			ports = (u8 *)&merge->l4.port_src;
 680			for (i = 0; i < 4; i++)
 681				ports[i] |= tport->tp_port_mask[i];
 682			break;
 683		case NFP_FL_ACTION_OPCODE_PRE_TUNNEL:
 684			pre_tun = (struct nfp_fl_pre_tunnel *)a;
 685			ipv6_tun = be16_to_cpu(pre_tun->flags) &
 686					NFP_FL_PRE_TUN_IPV6;
 687			break;
 688		case NFP_FL_ACTION_OPCODE_PRE_LAG:
 689		case NFP_FL_ACTION_OPCODE_PUSH_GENEVE:
 690			break;
 691		default:
 692			return -EOPNOTSUPP;
 693		}
 694
 695		act_off += a->len_lw << NFP_FL_LW_SIZ;
 696	}
 697
 698	if (last_act_id)
 699		*last_act_id = act_id;
 700
 701	return 0;
 702}
 703
 704static int
 705nfp_flower_populate_merge_match(struct nfp_fl_payload *flow,
 706				struct nfp_flower_merge_check *merge,
 707				bool extra_fields)
 708{
 709	struct nfp_flower_meta_tci *meta_tci;
 710	u8 *mask = flow->mask_data;
 711	u8 key_layer, match_size;
 712
 713	memset(merge, 0, sizeof(struct nfp_flower_merge_check));
 714
 715	meta_tci = (struct nfp_flower_meta_tci *)mask;
 716	key_layer = meta_tci->nfp_flow_key_layer;
 717
 718	if (key_layer & ~NFP_FLOWER_MERGE_FIELDS && !extra_fields)
 719		return -EOPNOTSUPP;
 720
 721	merge->tci = meta_tci->tci;
 722	mask += sizeof(struct nfp_flower_meta_tci);
 723
 724	if (key_layer & NFP_FLOWER_LAYER_EXT_META)
 725		mask += sizeof(struct nfp_flower_ext_meta);
 726
 727	mask += sizeof(struct nfp_flower_in_port);
 728
 729	if (key_layer & NFP_FLOWER_LAYER_MAC) {
 730		match_size = sizeof(struct nfp_flower_mac_mpls);
 731		memcpy(&merge->l2, mask, match_size);
 732		mask += match_size;
 733	}
 734
 735	if (key_layer & NFP_FLOWER_LAYER_TP) {
 736		match_size = sizeof(struct nfp_flower_tp_ports);
 737		memcpy(&merge->l4, mask, match_size);
 738		mask += match_size;
 739	}
 740
 741	if (key_layer & NFP_FLOWER_LAYER_IPV4) {
 742		match_size = sizeof(struct nfp_flower_ipv4);
 743		memcpy(&merge->ipv4, mask, match_size);
 744	}
 745
 746	if (key_layer & NFP_FLOWER_LAYER_IPV6) {
 747		match_size = sizeof(struct nfp_flower_ipv6);
 748		memcpy(&merge->ipv6, mask, match_size);
 749	}
 750
 751	return 0;
 752}
 753
 754static int
 755nfp_flower_can_merge(struct nfp_fl_payload *sub_flow1,
 756		     struct nfp_fl_payload *sub_flow2)
 757{
 758	/* Two flows can be merged if sub_flow2 only matches on bits that are
 759	 * either matched by sub_flow1 or set by a sub_flow1 action. This
 760	 * ensures that every packet that hits sub_flow1 and recirculates is
 761	 * guaranteed to hit sub_flow2.
 762	 */
 763	struct nfp_flower_merge_check sub_flow1_merge, sub_flow2_merge;
 764	int err, act_out = 0;
 765	u8 last_act_id = 0;
 766
 767	err = nfp_flower_populate_merge_match(sub_flow1, &sub_flow1_merge,
 768					      true);
 769	if (err)
 770		return err;
 771
 772	err = nfp_flower_populate_merge_match(sub_flow2, &sub_flow2_merge,
 773					      false);
 774	if (err)
 775		return err;
 776
 777	err = nfp_flower_update_merge_with_actions(sub_flow1, &sub_flow1_merge,
 778						   &last_act_id, &act_out);
 779	if (err)
 780		return err;
 781
 782	/* Must only be 1 output action and it must be the last in sequence. */
 783	if (act_out != 1 || last_act_id != NFP_FL_ACTION_OPCODE_OUTPUT)
 784		return -EOPNOTSUPP;
 785
 786	/* Reject merge if sub_flow2 matches on something that is not matched
 787	 * on or set in an action by sub_flow1.
 788	 */
 789	err = bitmap_andnot(sub_flow2_merge.vals, sub_flow2_merge.vals,
 790			    sub_flow1_merge.vals,
 791			    sizeof(struct nfp_flower_merge_check) * 8);
 792	if (err)
 793		return -EINVAL;
 794
 795	return 0;
 796}
 797
 798static unsigned int
 799nfp_flower_copy_pre_actions(char *act_dst, char *act_src, int len,
 800			    bool *tunnel_act)
 801{
 802	unsigned int act_off = 0, act_len;
 803	struct nfp_fl_act_head *a;
 804	u8 act_id = 0;
 805
 806	while (act_off < len) {
 807		a = (struct nfp_fl_act_head *)&act_src[act_off];
 808		act_len = a->len_lw << NFP_FL_LW_SIZ;
 809		act_id = a->jump_id;
 810
 811		switch (act_id) {
 812		case NFP_FL_ACTION_OPCODE_PRE_TUNNEL:
 813			if (tunnel_act)
 814				*tunnel_act = true;
 815			fallthrough;
 816		case NFP_FL_ACTION_OPCODE_PRE_LAG:
 817			memcpy(act_dst + act_off, act_src + act_off, act_len);
 818			break;
 819		default:
 820			return act_off;
 821		}
 822
 823		act_off += act_len;
 824	}
 825
 826	return act_off;
 827}
 828
 829static int
 830nfp_fl_verify_post_tun_acts(char *acts, int len, struct nfp_fl_push_vlan **vlan)
 831{
 832	struct nfp_fl_act_head *a;
 833	unsigned int act_off = 0;
 834
 835	while (act_off < len) {
 836		a = (struct nfp_fl_act_head *)&acts[act_off];
 837
 838		if (a->jump_id == NFP_FL_ACTION_OPCODE_PUSH_VLAN && !act_off)
 839			*vlan = (struct nfp_fl_push_vlan *)a;
 840		else if (a->jump_id != NFP_FL_ACTION_OPCODE_OUTPUT)
 841			return -EOPNOTSUPP;
 842
 843		act_off += a->len_lw << NFP_FL_LW_SIZ;
 844	}
 845
 846	/* Ensure any VLAN push also has an egress action. */
 847	if (*vlan && act_off <= sizeof(struct nfp_fl_push_vlan))
 848		return -EOPNOTSUPP;
 849
 850	return 0;
 851}
 852
 853static int
 854nfp_fl_push_vlan_after_tun(char *acts, int len, struct nfp_fl_push_vlan *vlan)
 855{
 856	struct nfp_fl_set_tun *tun;
 857	struct nfp_fl_act_head *a;
 858	unsigned int act_off = 0;
 859
 860	while (act_off < len) {
 861		a = (struct nfp_fl_act_head *)&acts[act_off];
 862
 863		if (a->jump_id == NFP_FL_ACTION_OPCODE_SET_TUNNEL) {
 864			tun = (struct nfp_fl_set_tun *)a;
 865			tun->outer_vlan_tpid = vlan->vlan_tpid;
 866			tun->outer_vlan_tci = vlan->vlan_tci;
 867
 868			return 0;
 869		}
 870
 871		act_off += a->len_lw << NFP_FL_LW_SIZ;
 872	}
 873
 874	/* Return error if no tunnel action is found. */
 875	return -EOPNOTSUPP;
 876}
 877
 878static int
 879nfp_flower_merge_action(struct nfp_fl_payload *sub_flow1,
 880			struct nfp_fl_payload *sub_flow2,
 881			struct nfp_fl_payload *merge_flow)
 882{
 883	unsigned int sub1_act_len, sub2_act_len, pre_off1, pre_off2;
 884	struct nfp_fl_push_vlan *post_tun_push_vlan = NULL;
 885	bool tunnel_act = false;
 886	char *merge_act;
 887	int err;
 888
 889	/* The last action of sub_flow1 must be output - do not merge this. */
 890	sub1_act_len = sub_flow1->meta.act_len - sizeof(struct nfp_fl_output);
 891	sub2_act_len = sub_flow2->meta.act_len;
 892
 893	if (!sub2_act_len)
 894		return -EINVAL;
 895
 896	if (sub1_act_len + sub2_act_len > NFP_FL_MAX_A_SIZ)
 897		return -EINVAL;
 898
 899	/* A shortcut can only be applied if there is a single action. */
 900	if (sub1_act_len)
 901		merge_flow->meta.shortcut = cpu_to_be32(NFP_FL_SC_ACT_NULL);
 902	else
 903		merge_flow->meta.shortcut = sub_flow2->meta.shortcut;
 904
 905	merge_flow->meta.act_len = sub1_act_len + sub2_act_len;
 906	merge_act = merge_flow->action_data;
 907
 908	/* Copy any pre-actions to the start of merge flow action list. */
 909	pre_off1 = nfp_flower_copy_pre_actions(merge_act,
 910					       sub_flow1->action_data,
 911					       sub1_act_len, &tunnel_act);
 912	merge_act += pre_off1;
 913	sub1_act_len -= pre_off1;
 914	pre_off2 = nfp_flower_copy_pre_actions(merge_act,
 915					       sub_flow2->action_data,
 916					       sub2_act_len, NULL);
 917	merge_act += pre_off2;
 918	sub2_act_len -= pre_off2;
 919
 920	/* FW does a tunnel push when egressing, therefore, if sub_flow 1 pushes
 921	 * a tunnel, there are restrictions on what sub_flow 2 actions lead to a
 922	 * valid merge.
 923	 */
 924	if (tunnel_act) {
 925		char *post_tun_acts = &sub_flow2->action_data[pre_off2];
 926
 927		err = nfp_fl_verify_post_tun_acts(post_tun_acts, sub2_act_len,
 928						  &post_tun_push_vlan);
 929		if (err)
 930			return err;
 931
 932		if (post_tun_push_vlan) {
 933			pre_off2 += sizeof(*post_tun_push_vlan);
 934			sub2_act_len -= sizeof(*post_tun_push_vlan);
 935		}
 936	}
 937
 938	/* Copy remaining actions from sub_flows 1 and 2. */
 939	memcpy(merge_act, sub_flow1->action_data + pre_off1, sub1_act_len);
 940
 941	if (post_tun_push_vlan) {
 942		/* Update tunnel action in merge to include VLAN push. */
 943		err = nfp_fl_push_vlan_after_tun(merge_act, sub1_act_len,
 944						 post_tun_push_vlan);
 945		if (err)
 946			return err;
 947
 948		merge_flow->meta.act_len -= sizeof(*post_tun_push_vlan);
 949	}
 950
 951	merge_act += sub1_act_len;
 952	memcpy(merge_act, sub_flow2->action_data + pre_off2, sub2_act_len);
 953
 954	return 0;
 955}
 956
 957/* Flow link code should only be accessed under RTNL. */
 958static void nfp_flower_unlink_flow(struct nfp_fl_payload_link *link)
 959{
 960	list_del(&link->merge_flow.list);
 961	list_del(&link->sub_flow.list);
 962	kfree(link);
 963}
 964
 965static void nfp_flower_unlink_flows(struct nfp_fl_payload *merge_flow,
 966				    struct nfp_fl_payload *sub_flow)
 967{
 968	struct nfp_fl_payload_link *link;
 969
 970	list_for_each_entry(link, &merge_flow->linked_flows, merge_flow.list)
 971		if (link->sub_flow.flow == sub_flow) {
 972			nfp_flower_unlink_flow(link);
 973			return;
 974		}
 975}
 976
 977static int nfp_flower_link_flows(struct nfp_fl_payload *merge_flow,
 978				 struct nfp_fl_payload *sub_flow)
 979{
 980	struct nfp_fl_payload_link *link;
 981
 982	link = kmalloc(sizeof(*link), GFP_KERNEL);
 983	if (!link)
 984		return -ENOMEM;
 985
 986	link->merge_flow.flow = merge_flow;
 987	list_add_tail(&link->merge_flow.list, &merge_flow->linked_flows);
 988	link->sub_flow.flow = sub_flow;
 989	list_add_tail(&link->sub_flow.list, &sub_flow->linked_flows);
 990
 991	return 0;
 992}
 993
 994/**
 995 * nfp_flower_merge_offloaded_flows() - Merge 2 existing flows to single flow.
 996 * @app:	Pointer to the APP handle
 997 * @sub_flow1:	Initial flow matched to produce merge hint
 998 * @sub_flow2:	Post recirculation flow matched in merge hint
 999 *
1000 * Combines 2 flows (if valid) to a single flow, removing the initial from hw
1001 * and offloading the new, merged flow.
1002 *
1003 * Return: negative value on error, 0 in success.
1004 */
1005int nfp_flower_merge_offloaded_flows(struct nfp_app *app,
1006				     struct nfp_fl_payload *sub_flow1,
1007				     struct nfp_fl_payload *sub_flow2)
1008{
1009	struct nfp_flower_priv *priv = app->priv;
1010	struct nfp_fl_payload *merge_flow;
1011	struct nfp_fl_key_ls merge_key_ls;
1012	struct nfp_merge_info *merge_info;
1013	u64 parent_ctx = 0;
1014	int err;
1015
1016	if (sub_flow1 == sub_flow2 ||
1017	    nfp_flower_is_merge_flow(sub_flow1) ||
1018	    nfp_flower_is_merge_flow(sub_flow2))
1019		return -EINVAL;
1020
1021	/* Check if the two flows are already merged */
1022	parent_ctx = (u64)(be32_to_cpu(sub_flow1->meta.host_ctx_id)) << 32;
1023	parent_ctx |= (u64)(be32_to_cpu(sub_flow2->meta.host_ctx_id));
1024	if (rhashtable_lookup_fast(&priv->merge_table,
1025				   &parent_ctx, merge_table_params)) {
1026		nfp_flower_cmsg_warn(app, "The two flows are already merged.\n");
1027		return 0;
1028	}
1029
1030	err = nfp_flower_can_merge(sub_flow1, sub_flow2);
1031	if (err)
1032		return err;
1033
1034	merge_key_ls.key_size = sub_flow1->meta.key_len;
1035
1036	merge_flow = nfp_flower_allocate_new(&merge_key_ls);
1037	if (!merge_flow)
1038		return -ENOMEM;
1039
1040	merge_flow->tc_flower_cookie = (unsigned long)merge_flow;
1041	merge_flow->ingress_dev = sub_flow1->ingress_dev;
1042
1043	memcpy(merge_flow->unmasked_data, sub_flow1->unmasked_data,
1044	       sub_flow1->meta.key_len);
1045	memcpy(merge_flow->mask_data, sub_flow1->mask_data,
1046	       sub_flow1->meta.mask_len);
1047
1048	err = nfp_flower_merge_action(sub_flow1, sub_flow2, merge_flow);
1049	if (err)
1050		goto err_destroy_merge_flow;
1051
1052	err = nfp_flower_link_flows(merge_flow, sub_flow1);
1053	if (err)
1054		goto err_destroy_merge_flow;
1055
1056	err = nfp_flower_link_flows(merge_flow, sub_flow2);
1057	if (err)
1058		goto err_unlink_sub_flow1;
1059
1060	err = nfp_compile_flow_metadata(app, merge_flow->tc_flower_cookie, merge_flow,
1061					merge_flow->ingress_dev, NULL);
1062	if (err)
1063		goto err_unlink_sub_flow2;
1064
1065	err = rhashtable_insert_fast(&priv->flow_table, &merge_flow->fl_node,
1066				     nfp_flower_table_params);
1067	if (err)
1068		goto err_release_metadata;
1069
1070	merge_info = kmalloc(sizeof(*merge_info), GFP_KERNEL);
1071	if (!merge_info) {
1072		err = -ENOMEM;
1073		goto err_remove_rhash;
1074	}
1075	merge_info->parent_ctx = parent_ctx;
1076	err = rhashtable_insert_fast(&priv->merge_table, &merge_info->ht_node,
1077				     merge_table_params);
1078	if (err)
1079		goto err_destroy_merge_info;
1080
1081	err = nfp_flower_xmit_flow(app, merge_flow,
1082				   NFP_FLOWER_CMSG_TYPE_FLOW_MOD);
1083	if (err)
1084		goto err_remove_merge_info;
1085
1086	merge_flow->in_hw = true;
1087	sub_flow1->in_hw = false;
1088
1089	return 0;
1090
1091err_remove_merge_info:
1092	WARN_ON_ONCE(rhashtable_remove_fast(&priv->merge_table,
1093					    &merge_info->ht_node,
1094					    merge_table_params));
1095err_destroy_merge_info:
1096	kfree(merge_info);
1097err_remove_rhash:
1098	WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
1099					    &merge_flow->fl_node,
1100					    nfp_flower_table_params));
1101err_release_metadata:
1102	nfp_modify_flow_metadata(app, merge_flow);
1103err_unlink_sub_flow2:
1104	nfp_flower_unlink_flows(merge_flow, sub_flow2);
1105err_unlink_sub_flow1:
1106	nfp_flower_unlink_flows(merge_flow, sub_flow1);
1107err_destroy_merge_flow:
1108	kfree(merge_flow->action_data);
1109	kfree(merge_flow->mask_data);
1110	kfree(merge_flow->unmasked_data);
1111	kfree(merge_flow);
1112	return err;
1113}
1114
1115/**
1116 * nfp_flower_validate_pre_tun_rule()
1117 * @app:	Pointer to the APP handle
1118 * @flow:	Pointer to NFP flow representation of rule
1119 * @key_ls:	Pointer to NFP key layers structure
1120 * @extack:	Netlink extended ACK report
1121 *
1122 * Verifies the flow as a pre-tunnel rule.
1123 *
1124 * Return: negative value on error, 0 if verified.
1125 */
1126static int
1127nfp_flower_validate_pre_tun_rule(struct nfp_app *app,
1128				 struct nfp_fl_payload *flow,
1129				 struct nfp_fl_key_ls *key_ls,
1130				 struct netlink_ext_ack *extack)
1131{
1132	struct nfp_flower_priv *priv = app->priv;
1133	struct nfp_flower_meta_tci *meta_tci;
1134	struct nfp_flower_mac_mpls *mac;
1135	u8 *ext = flow->unmasked_data;
1136	struct nfp_fl_act_head *act;
1137	u8 *mask = flow->mask_data;
1138	bool vlan = false;
1139	int act_offset;
1140	u8 key_layer;
1141
1142	meta_tci = (struct nfp_flower_meta_tci *)flow->unmasked_data;
1143	key_layer = key_ls->key_layer;
1144	if (!(priv->flower_ext_feats & NFP_FL_FEATS_VLAN_QINQ)) {
1145		if (meta_tci->tci & cpu_to_be16(NFP_FLOWER_MASK_VLAN_PRESENT)) {
1146			u16 vlan_tci = be16_to_cpu(meta_tci->tci);
1147
1148			vlan_tci &= ~NFP_FLOWER_MASK_VLAN_PRESENT;
1149			flow->pre_tun_rule.vlan_tci = cpu_to_be16(vlan_tci);
1150			vlan = true;
1151		} else {
1152			flow->pre_tun_rule.vlan_tci = cpu_to_be16(0xffff);
1153		}
1154	}
1155
1156	if (key_layer & ~NFP_FLOWER_PRE_TUN_RULE_FIELDS) {
1157		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: too many match fields");
1158		return -EOPNOTSUPP;
1159	} else if (key_ls->key_layer_two & ~NFP_FLOWER_LAYER2_QINQ) {
1160		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: non-vlan in extended match fields");
1161		return -EOPNOTSUPP;
1162	}
1163
1164	if (!(key_layer & NFP_FLOWER_LAYER_MAC)) {
1165		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: MAC fields match required");
1166		return -EOPNOTSUPP;
1167	}
1168
1169	if (!(key_layer & NFP_FLOWER_LAYER_IPV4) &&
1170	    !(key_layer & NFP_FLOWER_LAYER_IPV6)) {
1171		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: match on ipv4/ipv6 eth_type must be present");
1172		return -EOPNOTSUPP;
1173	}
1174
1175	if (key_layer & NFP_FLOWER_LAYER_IPV6)
1176		flow->pre_tun_rule.is_ipv6 = true;
1177	else
1178		flow->pre_tun_rule.is_ipv6 = false;
1179
1180	/* Skip fields known to exist. */
1181	mask += sizeof(struct nfp_flower_meta_tci);
1182	ext += sizeof(struct nfp_flower_meta_tci);
1183	if (key_ls->key_layer_two) {
1184		mask += sizeof(struct nfp_flower_ext_meta);
1185		ext += sizeof(struct nfp_flower_ext_meta);
1186	}
1187	mask += sizeof(struct nfp_flower_in_port);
1188	ext += sizeof(struct nfp_flower_in_port);
1189
1190	/* Ensure destination MAC address is fully matched. */
1191	mac = (struct nfp_flower_mac_mpls *)mask;
1192	if (!is_broadcast_ether_addr(&mac->mac_dst[0])) {
1193		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: dest MAC field must not be masked");
1194		return -EOPNOTSUPP;
1195	}
1196
1197	/* Ensure source MAC address is fully matched. This is only needed
1198	 * for firmware with the DECAP_V2 feature enabled. Don't do this
1199	 * for firmware without this feature to keep old behaviour.
1200	 */
1201	if (priv->flower_ext_feats & NFP_FL_FEATS_DECAP_V2) {
1202		mac = (struct nfp_flower_mac_mpls *)mask;
1203		if (!is_broadcast_ether_addr(&mac->mac_src[0])) {
1204			NL_SET_ERR_MSG_MOD(extack,
1205					   "unsupported pre-tunnel rule: source MAC field must not be masked");
1206			return -EOPNOTSUPP;
1207		}
1208	}
1209
1210	if (mac->mpls_lse) {
1211		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: MPLS not supported");
1212		return -EOPNOTSUPP;
1213	}
1214
1215	/* Ensure destination MAC address matches pre_tun_dev. */
1216	mac = (struct nfp_flower_mac_mpls *)ext;
1217	if (memcmp(&mac->mac_dst[0], flow->pre_tun_rule.dev->dev_addr, 6)) {
1218		NL_SET_ERR_MSG_MOD(extack,
1219				   "unsupported pre-tunnel rule: dest MAC must match output dev MAC");
1220		return -EOPNOTSUPP;
1221	}
1222
1223	/* Save mac addresses in pre_tun_rule entry for later use */
1224	memcpy(&flow->pre_tun_rule.loc_mac, &mac->mac_dst[0], ETH_ALEN);
1225	memcpy(&flow->pre_tun_rule.rem_mac, &mac->mac_src[0], ETH_ALEN);
1226
1227	mask += sizeof(struct nfp_flower_mac_mpls);
1228	ext += sizeof(struct nfp_flower_mac_mpls);
1229	if (key_layer & NFP_FLOWER_LAYER_IPV4 ||
1230	    key_layer & NFP_FLOWER_LAYER_IPV6) {
1231		/* Flags and proto fields have same offset in IPv4 and IPv6. */
1232		int ip_flags = offsetof(struct nfp_flower_ipv4, ip_ext.flags);
1233		int ip_proto = offsetof(struct nfp_flower_ipv4, ip_ext.proto);
1234		int size;
1235		int i;
1236
1237		size = key_layer & NFP_FLOWER_LAYER_IPV4 ?
1238			sizeof(struct nfp_flower_ipv4) :
1239			sizeof(struct nfp_flower_ipv6);
1240
1241
1242		/* Ensure proto and flags are the only IP layer fields. */
1243		for (i = 0; i < size; i++)
1244			if (mask[i] && i != ip_flags && i != ip_proto) {
1245				NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: only flags and proto can be matched in ip header");
1246				return -EOPNOTSUPP;
1247			}
1248		ext += size;
1249		mask += size;
1250	}
1251
1252	if ((priv->flower_ext_feats & NFP_FL_FEATS_VLAN_QINQ)) {
1253		if (key_ls->key_layer_two & NFP_FLOWER_LAYER2_QINQ) {
1254			struct nfp_flower_vlan *vlan_tags;
1255			u16 vlan_tpid;
1256			u16 vlan_tci;
1257
1258			vlan_tags = (struct nfp_flower_vlan *)ext;
1259
1260			vlan_tci = be16_to_cpu(vlan_tags->outer_tci);
1261			vlan_tpid = be16_to_cpu(vlan_tags->outer_tpid);
1262
1263			vlan_tci &= ~NFP_FLOWER_MASK_VLAN_PRESENT;
1264			flow->pre_tun_rule.vlan_tci = cpu_to_be16(vlan_tci);
1265			flow->pre_tun_rule.vlan_tpid = cpu_to_be16(vlan_tpid);
1266			vlan = true;
1267		} else {
1268			flow->pre_tun_rule.vlan_tci = cpu_to_be16(0xffff);
1269			flow->pre_tun_rule.vlan_tpid = cpu_to_be16(0xffff);
1270		}
1271	}
1272
1273	/* Action must be a single egress or pop_vlan and egress. */
1274	act_offset = 0;
1275	act = (struct nfp_fl_act_head *)&flow->action_data[act_offset];
1276	if (vlan) {
1277		if (act->jump_id != NFP_FL_ACTION_OPCODE_POP_VLAN) {
1278			NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: match on VLAN must have VLAN pop as first action");
1279			return -EOPNOTSUPP;
1280		}
1281
1282		act_offset += act->len_lw << NFP_FL_LW_SIZ;
1283		act = (struct nfp_fl_act_head *)&flow->action_data[act_offset];
1284	}
1285
1286	if (act->jump_id != NFP_FL_ACTION_OPCODE_OUTPUT) {
1287		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: non egress action detected where egress was expected");
1288		return -EOPNOTSUPP;
1289	}
1290
1291	act_offset += act->len_lw << NFP_FL_LW_SIZ;
1292
1293	/* Ensure there are no more actions after egress. */
1294	if (act_offset != flow->meta.act_len) {
1295		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: egress is not the last action");
1296		return -EOPNOTSUPP;
1297	}
1298
1299	return 0;
1300}
1301
1302static bool offload_pre_check(struct flow_cls_offload *flow)
1303{
1304	struct flow_rule *rule = flow_cls_offload_flow_rule(flow);
1305	struct flow_dissector *dissector = rule->match.dissector;
1306	struct flow_match_ct ct;
1307
1308	if (dissector->used_keys & BIT_ULL(FLOW_DISSECTOR_KEY_CT)) {
1309		flow_rule_match_ct(rule, &ct);
1310		/* Allow special case where CT match is all 0 */
1311		if (memchr_inv(ct.key, 0, sizeof(*ct.key)))
1312			return false;
1313	}
1314
1315	if (flow->common.chain_index)
1316		return false;
1317
1318	return true;
1319}
1320
1321/**
1322 * nfp_flower_add_offload() - Adds a new flow to hardware.
1323 * @app:	Pointer to the APP handle
1324 * @netdev:	netdev structure.
1325 * @flow:	TC flower classifier offload structure.
1326 *
1327 * Adds a new flow to the repeated hash structure and action payload.
1328 *
1329 * Return: negative value on error, 0 if configured successfully.
1330 */
1331static int
1332nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
1333		       struct flow_cls_offload *flow)
1334{
1335	struct flow_rule *rule = flow_cls_offload_flow_rule(flow);
1336	enum nfp_flower_tun_type tun_type = NFP_FL_TUNNEL_NONE;
1337	struct nfp_flower_priv *priv = app->priv;
1338	struct netlink_ext_ack *extack = NULL;
1339	struct nfp_fl_payload *flow_pay;
1340	struct nfp_fl_key_ls *key_layer;
1341	struct nfp_port *port = NULL;
1342	int err;
1343
1344	extack = flow->common.extack;
1345	if (nfp_netdev_is_nfp_repr(netdev))
1346		port = nfp_port_from_netdev(netdev);
1347
1348	if (is_pre_ct_flow(flow))
1349		return nfp_fl_ct_handle_pre_ct(priv, netdev, flow, extack, NULL);
1350
1351	if (is_post_ct_flow(flow))
1352		return nfp_fl_ct_handle_post_ct(priv, netdev, flow, extack);
1353
1354	if (!offload_pre_check(flow))
1355		return -EOPNOTSUPP;
1356
1357	key_layer = kmalloc(sizeof(*key_layer), GFP_KERNEL);
1358	if (!key_layer)
1359		return -ENOMEM;
1360
1361	err = nfp_flower_calculate_key_layers(app, netdev, key_layer, rule,
1362					      &tun_type, extack);
1363	if (err)
1364		goto err_free_key_ls;
1365
1366	flow_pay = nfp_flower_allocate_new(key_layer);
1367	if (!flow_pay) {
1368		err = -ENOMEM;
1369		goto err_free_key_ls;
1370	}
1371
1372	err = nfp_flower_compile_flow_match(app, rule, key_layer, netdev,
1373					    flow_pay, tun_type, extack);
1374	if (err)
1375		goto err_destroy_flow;
1376
1377	err = nfp_flower_compile_action(app, rule, netdev, flow_pay, extack);
1378	if (err)
1379		goto err_destroy_flow;
1380
1381	if (flow_pay->pre_tun_rule.dev) {
1382		err = nfp_flower_validate_pre_tun_rule(app, flow_pay, key_layer, extack);
1383		if (err)
1384			goto err_destroy_flow;
1385	}
1386
1387	err = nfp_compile_flow_metadata(app, flow->cookie, flow_pay, netdev, extack);
1388	if (err)
1389		goto err_destroy_flow;
1390
1391	flow_pay->tc_flower_cookie = flow->cookie;
1392	err = rhashtable_insert_fast(&priv->flow_table, &flow_pay->fl_node,
1393				     nfp_flower_table_params);
1394	if (err) {
1395		NL_SET_ERR_MSG_MOD(extack, "invalid entry: cannot insert flow into tables for offloads");
1396		goto err_release_metadata;
1397	}
1398
1399	if (flow_pay->pre_tun_rule.dev) {
1400		if (priv->flower_ext_feats & NFP_FL_FEATS_DECAP_V2) {
1401			struct nfp_predt_entry *predt;
1402
1403			predt = kzalloc(sizeof(*predt), GFP_KERNEL);
1404			if (!predt) {
1405				err = -ENOMEM;
1406				goto err_remove_rhash;
1407			}
1408			predt->flow_pay = flow_pay;
1409			INIT_LIST_HEAD(&predt->nn_list);
1410			spin_lock_bh(&priv->predt_lock);
1411			list_add(&predt->list_head, &priv->predt_list);
1412			flow_pay->pre_tun_rule.predt = predt;
1413			nfp_tun_link_and_update_nn_entries(app, predt);
1414			spin_unlock_bh(&priv->predt_lock);
1415		} else {
1416			err = nfp_flower_xmit_pre_tun_flow(app, flow_pay);
1417		}
1418	} else {
1419		err = nfp_flower_xmit_flow(app, flow_pay,
1420					   NFP_FLOWER_CMSG_TYPE_FLOW_ADD);
1421	}
1422
1423	if (err)
1424		goto err_remove_rhash;
1425
1426	if (port)
1427		port->tc_offload_cnt++;
1428
1429	flow_pay->in_hw = true;
1430
1431	/* Deallocate flow payload when flower rule has been destroyed. */
1432	kfree(key_layer);
1433
1434	return 0;
1435
1436err_remove_rhash:
1437	WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
1438					    &flow_pay->fl_node,
1439					    nfp_flower_table_params));
1440err_release_metadata:
1441	nfp_modify_flow_metadata(app, flow_pay);
1442err_destroy_flow:
1443	if (flow_pay->nfp_tun_ipv6)
1444		nfp_tunnel_put_ipv6_off(app, flow_pay->nfp_tun_ipv6);
1445	kfree(flow_pay->action_data);
1446	kfree(flow_pay->mask_data);
1447	kfree(flow_pay->unmasked_data);
1448	kfree(flow_pay);
1449err_free_key_ls:
1450	kfree(key_layer);
1451	return err;
1452}
1453
1454static void
1455nfp_flower_remove_merge_flow(struct nfp_app *app,
1456			     struct nfp_fl_payload *del_sub_flow,
1457			     struct nfp_fl_payload *merge_flow)
1458{
1459	struct nfp_flower_priv *priv = app->priv;
1460	struct nfp_fl_payload_link *link, *temp;
1461	struct nfp_merge_info *merge_info;
1462	struct nfp_fl_payload *origin;
1463	u64 parent_ctx = 0;
1464	bool mod = false;
1465	int err;
1466
1467	link = list_first_entry(&merge_flow->linked_flows,
1468				struct nfp_fl_payload_link, merge_flow.list);
1469	origin = link->sub_flow.flow;
1470
1471	/* Re-add rule the merge had overwritten if it has not been deleted. */
1472	if (origin != del_sub_flow)
1473		mod = true;
1474
1475	err = nfp_modify_flow_metadata(app, merge_flow);
1476	if (err) {
1477		nfp_flower_cmsg_warn(app, "Metadata fail for merge flow delete.\n");
1478		goto err_free_links;
1479	}
1480
1481	if (!mod) {
1482		err = nfp_flower_xmit_flow(app, merge_flow,
1483					   NFP_FLOWER_CMSG_TYPE_FLOW_DEL);
1484		if (err) {
1485			nfp_flower_cmsg_warn(app, "Failed to delete merged flow.\n");
1486			goto err_free_links;
1487		}
1488	} else {
1489		__nfp_modify_flow_metadata(priv, origin);
1490		err = nfp_flower_xmit_flow(app, origin,
1491					   NFP_FLOWER_CMSG_TYPE_FLOW_MOD);
1492		if (err)
1493			nfp_flower_cmsg_warn(app, "Failed to revert merge flow.\n");
1494		origin->in_hw = true;
1495	}
1496
1497err_free_links:
1498	/* Clean any links connected with the merged flow. */
1499	list_for_each_entry_safe(link, temp, &merge_flow->linked_flows,
1500				 merge_flow.list) {
1501		u32 ctx_id = be32_to_cpu(link->sub_flow.flow->meta.host_ctx_id);
1502
1503		parent_ctx = (parent_ctx << 32) | (u64)(ctx_id);
1504		nfp_flower_unlink_flow(link);
1505	}
1506
1507	merge_info = rhashtable_lookup_fast(&priv->merge_table,
1508					    &parent_ctx,
1509					    merge_table_params);
1510	if (merge_info) {
1511		WARN_ON_ONCE(rhashtable_remove_fast(&priv->merge_table,
1512						    &merge_info->ht_node,
1513						    merge_table_params));
1514		kfree(merge_info);
1515	}
1516
1517	kfree(merge_flow->action_data);
1518	kfree(merge_flow->mask_data);
1519	kfree(merge_flow->unmasked_data);
1520	WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
1521					    &merge_flow->fl_node,
1522					    nfp_flower_table_params));
1523	kfree_rcu(merge_flow, rcu);
1524}
1525
1526void
1527nfp_flower_del_linked_merge_flows(struct nfp_app *app,
1528				  struct nfp_fl_payload *sub_flow)
1529{
1530	struct nfp_fl_payload_link *link, *temp;
1531
1532	/* Remove any merge flow formed from the deleted sub_flow. */
1533	list_for_each_entry_safe(link, temp, &sub_flow->linked_flows,
1534				 sub_flow.list)
1535		nfp_flower_remove_merge_flow(app, sub_flow,
1536					     link->merge_flow.flow);
1537}
1538
1539/**
1540 * nfp_flower_del_offload() - Removes a flow from hardware.
1541 * @app:	Pointer to the APP handle
1542 * @netdev:	netdev structure.
1543 * @flow:	TC flower classifier offload structure
1544 *
1545 * Removes a flow from the repeated hash structure and clears the
1546 * action payload. Any flows merged from this are also deleted.
1547 *
1548 * Return: negative value on error, 0 if removed successfully.
1549 */
1550static int
1551nfp_flower_del_offload(struct nfp_app *app, struct net_device *netdev,
1552		       struct flow_cls_offload *flow)
1553{
1554	struct nfp_flower_priv *priv = app->priv;
1555	struct nfp_fl_ct_map_entry *ct_map_ent;
1556	struct netlink_ext_ack *extack = NULL;
1557	struct nfp_fl_payload *nfp_flow;
1558	struct nfp_port *port = NULL;
1559	int err;
1560
1561	extack = flow->common.extack;
1562	if (nfp_netdev_is_nfp_repr(netdev))
1563		port = nfp_port_from_netdev(netdev);
1564
1565	/* Check ct_map_table */
1566	ct_map_ent = rhashtable_lookup_fast(&priv->ct_map_table, &flow->cookie,
1567					    nfp_ct_map_params);
1568	if (ct_map_ent) {
1569		err = nfp_fl_ct_del_flow(ct_map_ent);
1570		return err;
1571	}
1572
1573	nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
1574	if (!nfp_flow) {
1575		NL_SET_ERR_MSG_MOD(extack, "invalid entry: cannot remove flow that does not exist");
1576		return -ENOENT;
1577	}
1578
1579	err = nfp_modify_flow_metadata(app, nfp_flow);
1580	if (err)
1581		goto err_free_merge_flow;
1582
1583	if (nfp_flow->nfp_tun_ipv4_addr)
1584		nfp_tunnel_del_ipv4_off(app, nfp_flow->nfp_tun_ipv4_addr);
1585
1586	if (nfp_flow->nfp_tun_ipv6)
1587		nfp_tunnel_put_ipv6_off(app, nfp_flow->nfp_tun_ipv6);
1588
1589	if (!nfp_flow->in_hw) {
1590		err = 0;
1591		goto err_free_merge_flow;
1592	}
1593
1594	if (nfp_flow->pre_tun_rule.dev) {
1595		if (priv->flower_ext_feats & NFP_FL_FEATS_DECAP_V2) {
1596			struct nfp_predt_entry *predt;
1597
1598			predt = nfp_flow->pre_tun_rule.predt;
1599			if (predt) {
1600				spin_lock_bh(&priv->predt_lock);
1601				nfp_tun_unlink_and_update_nn_entries(app, predt);
1602				list_del(&predt->list_head);
1603				spin_unlock_bh(&priv->predt_lock);
1604				kfree(predt);
1605			}
1606		} else {
1607			err = nfp_flower_xmit_pre_tun_del_flow(app, nfp_flow);
1608		}
1609	} else {
1610		err = nfp_flower_xmit_flow(app, nfp_flow,
1611					   NFP_FLOWER_CMSG_TYPE_FLOW_DEL);
1612	}
1613	/* Fall through on error. */
1614
1615err_free_merge_flow:
1616	nfp_flower_del_linked_merge_flows(app, nfp_flow);
1617	if (port)
1618		port->tc_offload_cnt--;
1619	kfree(nfp_flow->action_data);
1620	kfree(nfp_flow->mask_data);
1621	kfree(nfp_flow->unmasked_data);
1622	WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
1623					    &nfp_flow->fl_node,
1624					    nfp_flower_table_params));
1625	kfree_rcu(nfp_flow, rcu);
1626	return err;
1627}
1628
1629static void
1630__nfp_flower_update_merge_stats(struct nfp_app *app,
1631				struct nfp_fl_payload *merge_flow)
1632{
1633	struct nfp_flower_priv *priv = app->priv;
1634	struct nfp_fl_payload_link *link;
1635	struct nfp_fl_payload *sub_flow;
1636	u64 pkts, bytes, used;
1637	u32 ctx_id;
1638
1639	ctx_id = be32_to_cpu(merge_flow->meta.host_ctx_id);
1640	pkts = priv->stats[ctx_id].pkts;
1641	/* Do not cycle subflows if no stats to distribute. */
1642	if (!pkts)
1643		return;
1644	bytes = priv->stats[ctx_id].bytes;
1645	used = priv->stats[ctx_id].used;
1646
1647	/* Reset stats for the merge flow. */
1648	priv->stats[ctx_id].pkts = 0;
1649	priv->stats[ctx_id].bytes = 0;
1650
1651	/* The merge flow has received stats updates from firmware.
1652	 * Distribute these stats to all subflows that form the merge.
1653	 * The stats will collected from TC via the subflows.
1654	 */
1655	list_for_each_entry(link, &merge_flow->linked_flows, merge_flow.list) {
1656		sub_flow = link->sub_flow.flow;
1657		ctx_id = be32_to_cpu(sub_flow->meta.host_ctx_id);
1658		priv->stats[ctx_id].pkts += pkts;
1659		priv->stats[ctx_id].bytes += bytes;
1660		priv->stats[ctx_id].used = max_t(u64, used,
1661						 priv->stats[ctx_id].used);
1662	}
1663}
1664
1665void
1666nfp_flower_update_merge_stats(struct nfp_app *app,
1667			      struct nfp_fl_payload *sub_flow)
1668{
1669	struct nfp_fl_payload_link *link;
1670
1671	/* Get merge flows that the subflow forms to distribute their stats. */
1672	list_for_each_entry(link, &sub_flow->linked_flows, sub_flow.list)
1673		__nfp_flower_update_merge_stats(app, link->merge_flow.flow);
1674}
1675
1676/**
1677 * nfp_flower_get_stats() - Populates flow stats obtained from hardware.
1678 * @app:	Pointer to the APP handle
1679 * @netdev:	Netdev structure.
1680 * @flow:	TC flower classifier offload structure
1681 *
1682 * Populates a flow statistics structure which which corresponds to a
1683 * specific flow.
1684 *
1685 * Return: negative value on error, 0 if stats populated successfully.
1686 */
1687static int
1688nfp_flower_get_stats(struct nfp_app *app, struct net_device *netdev,
1689		     struct flow_cls_offload *flow)
1690{
1691	struct nfp_flower_priv *priv = app->priv;
1692	struct nfp_fl_ct_map_entry *ct_map_ent;
1693	struct netlink_ext_ack *extack = NULL;
1694	struct nfp_fl_payload *nfp_flow;
1695	u32 ctx_id;
1696
1697	/* Check ct_map table first */
1698	ct_map_ent = rhashtable_lookup_fast(&priv->ct_map_table, &flow->cookie,
1699					    nfp_ct_map_params);
1700	if (ct_map_ent)
1701		return nfp_fl_ct_stats(flow, ct_map_ent);
1702
1703	extack = flow->common.extack;
1704	nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
1705	if (!nfp_flow) {
1706		NL_SET_ERR_MSG_MOD(extack, "invalid entry: cannot dump stats for flow that does not exist");
1707		return -EINVAL;
1708	}
1709
1710	ctx_id = be32_to_cpu(nfp_flow->meta.host_ctx_id);
1711
1712	spin_lock_bh(&priv->stats_lock);
1713	/* If request is for a sub_flow, update stats from merged flows. */
1714	if (!list_empty(&nfp_flow->linked_flows))
1715		nfp_flower_update_merge_stats(app, nfp_flow);
1716
1717	flow_stats_update(&flow->stats, priv->stats[ctx_id].bytes,
1718			  priv->stats[ctx_id].pkts, 0, priv->stats[ctx_id].used,
1719			  FLOW_ACTION_HW_STATS_DELAYED);
1720
1721	priv->stats[ctx_id].pkts = 0;
1722	priv->stats[ctx_id].bytes = 0;
1723	spin_unlock_bh(&priv->stats_lock);
1724
1725	return 0;
1726}
1727
1728static int
1729nfp_flower_repr_offload(struct nfp_app *app, struct net_device *netdev,
1730			struct flow_cls_offload *flower)
1731{
1732	struct nfp_flower_priv *priv = app->priv;
1733	int ret;
1734
1735	if (!eth_proto_is_802_3(flower->common.protocol))
1736		return -EOPNOTSUPP;
1737
1738	mutex_lock(&priv->nfp_fl_lock);
1739	switch (flower->command) {
1740	case FLOW_CLS_REPLACE:
1741		ret = nfp_flower_add_offload(app, netdev, flower);
1742		break;
1743	case FLOW_CLS_DESTROY:
1744		ret = nfp_flower_del_offload(app, netdev, flower);
1745		break;
1746	case FLOW_CLS_STATS:
1747		ret = nfp_flower_get_stats(app, netdev, flower);
1748		break;
1749	default:
1750		ret = -EOPNOTSUPP;
1751		break;
1752	}
1753	mutex_unlock(&priv->nfp_fl_lock);
1754
1755	return ret;
1756}
1757
1758static int nfp_flower_setup_tc_block_cb(enum tc_setup_type type,
1759					void *type_data, void *cb_priv)
1760{
1761	struct flow_cls_common_offload *common = type_data;
1762	struct nfp_repr *repr = cb_priv;
1763
1764	if (!tc_can_offload_extack(repr->netdev, common->extack))
1765		return -EOPNOTSUPP;
1766
1767	switch (type) {
1768	case TC_SETUP_CLSFLOWER:
1769		return nfp_flower_repr_offload(repr->app, repr->netdev,
1770					       type_data);
1771	case TC_SETUP_CLSMATCHALL:
1772		return nfp_flower_setup_qos_offload(repr->app, repr->netdev,
1773						    type_data);
1774	default:
1775		return -EOPNOTSUPP;
1776	}
1777}
1778
1779static LIST_HEAD(nfp_block_cb_list);
1780
1781static int nfp_flower_setup_tc_block(struct net_device *netdev,
1782				     struct flow_block_offload *f)
1783{
1784	struct nfp_repr *repr = netdev_priv(netdev);
1785	struct nfp_flower_repr_priv *repr_priv;
1786	struct flow_block_cb *block_cb;
1787
1788	if (f->binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1789		return -EOPNOTSUPP;
1790
1791	repr_priv = repr->app_priv;
1792	repr_priv->block_shared = f->block_shared;
1793	f->driver_block_list = &nfp_block_cb_list;
1794	f->unlocked_driver_cb = true;
1795
1796	switch (f->command) {
1797	case FLOW_BLOCK_BIND:
1798		if (flow_block_cb_is_busy(nfp_flower_setup_tc_block_cb, repr,
1799					  &nfp_block_cb_list))
1800			return -EBUSY;
1801
1802		block_cb = flow_block_cb_alloc(nfp_flower_setup_tc_block_cb,
1803					       repr, repr, NULL);
1804		if (IS_ERR(block_cb))
1805			return PTR_ERR(block_cb);
1806
1807		flow_block_cb_add(block_cb, f);
1808		list_add_tail(&block_cb->driver_list, &nfp_block_cb_list);
1809		return 0;
1810	case FLOW_BLOCK_UNBIND:
1811		block_cb = flow_block_cb_lookup(f->block,
1812						nfp_flower_setup_tc_block_cb,
1813						repr);
1814		if (!block_cb)
1815			return -ENOENT;
1816
1817		flow_block_cb_remove(block_cb, f);
1818		list_del(&block_cb->driver_list);
1819		return 0;
1820	default:
1821		return -EOPNOTSUPP;
1822	}
1823}
1824
1825int nfp_flower_setup_tc(struct nfp_app *app, struct net_device *netdev,
1826			enum tc_setup_type type, void *type_data)
1827{
1828	switch (type) {
1829	case TC_SETUP_BLOCK:
1830		return nfp_flower_setup_tc_block(netdev, type_data);
1831	default:
1832		return -EOPNOTSUPP;
1833	}
1834}
1835
1836struct nfp_flower_indr_block_cb_priv {
1837	struct net_device *netdev;
1838	struct nfp_app *app;
1839	struct list_head list;
1840};
1841
1842static struct nfp_flower_indr_block_cb_priv *
1843nfp_flower_indr_block_cb_priv_lookup(struct nfp_app *app,
1844				     struct net_device *netdev)
1845{
1846	struct nfp_flower_indr_block_cb_priv *cb_priv;
1847	struct nfp_flower_priv *priv = app->priv;
1848
1849	list_for_each_entry(cb_priv, &priv->indr_block_cb_priv, list)
1850		if (cb_priv->netdev == netdev)
1851			return cb_priv;
1852
1853	return NULL;
1854}
1855
1856static int nfp_flower_setup_indr_block_cb(enum tc_setup_type type,
1857					  void *type_data, void *cb_priv)
1858{
1859	struct nfp_flower_indr_block_cb_priv *priv = cb_priv;
1860
1861	switch (type) {
1862	case TC_SETUP_CLSFLOWER:
1863		return nfp_flower_repr_offload(priv->app, priv->netdev,
1864					       type_data);
1865	default:
1866		return -EOPNOTSUPP;
1867	}
1868}
1869
1870void nfp_flower_setup_indr_tc_release(void *cb_priv)
1871{
1872	struct nfp_flower_indr_block_cb_priv *priv = cb_priv;
1873
1874	list_del(&priv->list);
1875	kfree(priv);
1876}
1877
1878static int
1879nfp_flower_setup_indr_tc_block(struct net_device *netdev, struct Qdisc *sch, struct nfp_app *app,
1880			       struct flow_block_offload *f, void *data,
1881			       void (*cleanup)(struct flow_block_cb *block_cb))
1882{
1883	struct nfp_flower_indr_block_cb_priv *cb_priv;
1884	struct nfp_flower_priv *priv = app->priv;
1885	struct flow_block_cb *block_cb;
1886
1887	if ((f->binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
1888	     !nfp_flower_internal_port_can_offload(app, netdev)) ||
1889	    (f->binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS &&
1890	     nfp_flower_internal_port_can_offload(app, netdev)))
1891		return -EOPNOTSUPP;
1892
1893	f->unlocked_driver_cb = true;
1894
1895	switch (f->command) {
1896	case FLOW_BLOCK_BIND:
1897		cb_priv = nfp_flower_indr_block_cb_priv_lookup(app, netdev);
1898		if (cb_priv &&
1899		    flow_block_cb_is_busy(nfp_flower_setup_indr_block_cb,
1900					  cb_priv,
1901					  &nfp_block_cb_list))
1902			return -EBUSY;
1903
1904		cb_priv = kmalloc(sizeof(*cb_priv), GFP_KERNEL);
1905		if (!cb_priv)
1906			return -ENOMEM;
1907
1908		cb_priv->netdev = netdev;
1909		cb_priv->app = app;
1910		list_add(&cb_priv->list, &priv->indr_block_cb_priv);
1911
1912		block_cb = flow_indr_block_cb_alloc(nfp_flower_setup_indr_block_cb,
1913						    cb_priv, cb_priv,
1914						    nfp_flower_setup_indr_tc_release,
1915						    f, netdev, sch, data, app, cleanup);
1916		if (IS_ERR(block_cb)) {
1917			list_del(&cb_priv->list);
1918			kfree(cb_priv);
1919			return PTR_ERR(block_cb);
1920		}
1921
1922		flow_block_cb_add(block_cb, f);
1923		list_add_tail(&block_cb->driver_list, &nfp_block_cb_list);
1924		return 0;
1925	case FLOW_BLOCK_UNBIND:
1926		cb_priv = nfp_flower_indr_block_cb_priv_lookup(app, netdev);
1927		if (!cb_priv)
1928			return -ENOENT;
1929
1930		block_cb = flow_block_cb_lookup(f->block,
1931						nfp_flower_setup_indr_block_cb,
1932						cb_priv);
1933		if (!block_cb)
1934			return -ENOENT;
1935
1936		flow_indr_block_cb_remove(block_cb, f);
1937		list_del(&block_cb->driver_list);
1938		return 0;
1939	default:
1940		return -EOPNOTSUPP;
1941	}
1942	return 0;
1943}
1944
1945static int
1946nfp_setup_tc_no_dev(struct nfp_app *app, enum tc_setup_type type, void *data)
1947{
1948	if (!data)
1949		return -EOPNOTSUPP;
1950
1951	switch (type) {
1952	case TC_SETUP_ACT:
1953		return nfp_setup_tc_act_offload(app, data);
1954	default:
1955		return -EOPNOTSUPP;
1956	}
1957}
1958
1959int
1960nfp_flower_indr_setup_tc_cb(struct net_device *netdev, struct Qdisc *sch, void *cb_priv,
1961			    enum tc_setup_type type, void *type_data,
1962			    void *data,
1963			    void (*cleanup)(struct flow_block_cb *block_cb))
1964{
1965	if (!netdev)
1966		return nfp_setup_tc_no_dev(cb_priv, type, data);
1967
1968	if (!nfp_fl_is_netdev_to_offload(netdev))
1969		return -EOPNOTSUPP;
1970
1971	switch (type) {
1972	case TC_SETUP_BLOCK:
1973		return nfp_flower_setup_indr_tc_block(netdev, sch, cb_priv,
1974						      type_data, data, cleanup);
1975	default:
1976		return -EOPNOTSUPP;
1977	}
1978}