/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2019, Intel Corporation. */

#ifndef _ICE_PROTOCOL_TYPE_H_
#define _ICE_PROTOCOL_TYPE_H_
#define ICE_IPV6_ADDR_LENGTH 16

/* Each recipe can match up to 5 different fields. Fields to match can be meta-
 * data, values extracted from packet headers, or results from other recipes.
 * One of the 5 fields is reserved for matching the switch ID. So, up to 4
 * recipes can provide intermediate results to another one through chaining,
 * e.g. recipes 0, 1, 2, and 3 can provide intermediate results to recipe 4.
 */
#define ICE_NUM_WORDS_RECIPE 4

/* Max recipes that can be chained */
#define ICE_MAX_CHAIN_RECIPE 5

/* 1 word reserved for switch ID from allowed 5 words.
 * So a recipe can have max 4 words. And you can chain 5 such recipes
 * together. So maximum words that can be programmed for look up is 5 * 4.
 */
#define ICE_MAX_CHAIN_WORDS (ICE_NUM_WORDS_RECIPE * ICE_MAX_CHAIN_RECIPE)

/* Field vector index corresponding to chaining */
#define ICE_CHAIN_FV_INDEX_START 47

enum ice_protocol_type {
        ICE_MAC_OFOS = 0,
        ICE_MAC_IL,
        ICE_ETYPE_OL,
        ICE_ETYPE_IL,
        ICE_VLAN_OFOS,
        ICE_IPV4_OFOS,
        ICE_IPV4_IL,
        ICE_IPV6_OFOS,
        ICE_IPV6_IL,
        ICE_TCP_IL,
        ICE_UDP_OF,
        ICE_UDP_ILOS,
        ICE_VXLAN,
        ICE_GENEVE,
        ICE_NVGRE,
        ICE_GTP,
        ICE_GTP_NO_PAY,
        ICE_VXLAN_GPE,
        ICE_SCTP_IL,
        ICE_PROTOCOL_LAST
};

enum ice_sw_tunnel_type {
        ICE_NON_TUN = 0,
        ICE_SW_TUN_AND_NON_TUN,
        ICE_SW_TUN_VXLAN,
        ICE_SW_TUN_GENEVE,
        ICE_SW_TUN_NVGRE,
        ICE_SW_TUN_GTPU,
        ICE_SW_TUN_GTPC,
        ICE_ALL_TUNNELS /* All tunnel types including NVGRE */
};

/* Decoders for ice_prot_id:
 * - F: First
 * - I: Inner
 * - L: Last
 * - O: Outer
 * - S: Single
 */
enum ice_prot_id {
        ICE_PROT_ID_INVAL       = 0,
        ICE_PROT_MAC_OF_OR_S    = 1,
        ICE_PROT_MAC_IL         = 4,
        ICE_PROT_ETYPE_OL       = 9,
        ICE_PROT_ETYPE_IL       = 10,
        ICE_PROT_IPV4_OF_OR_S   = 32,
        ICE_PROT_IPV4_IL        = 33,
        ICE_PROT_IPV6_OF_OR_S   = 40,
        ICE_PROT_IPV6_IL        = 41,
        ICE_PROT_TCP_IL         = 49,
        ICE_PROT_UDP_OF         = 52,
        ICE_PROT_UDP_IL_OR_S    = 53,
        ICE_PROT_GRE_OF         = 64,
        ICE_PROT_ESP_F          = 88,
        ICE_PROT_ESP_2          = 89,
        ICE_PROT_SCTP_IL        = 96,
        ICE_PROT_ICMP_IL        = 98,
        ICE_PROT_ICMPV6_IL      = 100,
        ICE_PROT_PPPOE          = 103,
        ICE_PROT_L2TPV3         = 104,
        ICE_PROT_ARP_OF         = 118,
        ICE_PROT_META_ID        = 255, /* when offset == metadata */
        ICE_PROT_INVALID        = 255  /* when offset == ICE_FV_OFFSET_INVAL */
};

#define ICE_VNI_OFFSET          12 /* offset of VNI from ICE_PROT_UDP_OF */

#define ICE_MAC_OFOS_HW         1
#define ICE_MAC_IL_HW           4
#define ICE_ETYPE_OL_HW         9
#define ICE_ETYPE_IL_HW         10
#define ICE_VLAN_OF_HW          16
#define ICE_VLAN_OL_HW          17
#define ICE_IPV4_OFOS_HW        32
#define ICE_IPV4_IL_HW          33
#define ICE_IPV6_OFOS_HW        40
#define ICE_IPV6_IL_HW          41
#define ICE_TCP_IL_HW           49
#define ICE_UDP_ILOS_HW         53
#define ICE_GRE_OF_HW           64

#define ICE_UDP_OF_HW   52 /* UDP Tunnels */
#define ICE_META_DATA_ID_HW 255 /* this is used for tunnel type */

#define ICE_MDID_SIZE 2
#define ICE_TUN_FLAG_MDID 21
#define ICE_TUN_FLAG_MDID_OFF (ICE_MDID_SIZE * ICE_TUN_FLAG_MDID)
#define ICE_TUN_FLAG_MASK 0xFF

#define ICE_TUN_FLAG_FV_IND 2

/* Mapping of software defined protocol ID to hardware defined protocol ID */
struct ice_protocol_entry {
        enum ice_protocol_type type;
        u8 protocol_id;
};

struct ice_ether_hdr {
        u8 dst_addr[ETH_ALEN];
        u8 src_addr[ETH_ALEN];
};

struct ice_ethtype_hdr {
        __be16 ethtype_id;
};

struct ice_ether_vlan_hdr {
        u8 dst_addr[ETH_ALEN];
        u8 src_addr[ETH_ALEN];
        __be32 vlan_id;
};

struct ice_vlan_hdr {
        __be16 type;
        __be16 vlan;
};

struct ice_ipv4_hdr {
        u8 version;
        u8 tos;
        __be16 total_length;
        __be16 id;
        __be16 frag_off;
        u8 time_to_live;
        u8 protocol;
        __be16 check;
        __be32 src_addr;
        __be32 dst_addr;
};

struct ice_ipv6_hdr {
        __be32 be_ver_tc_flow;
        __be16 payload_len;
        u8 next_hdr;
        u8 hop_limit;
        u8 src_addr[ICE_IPV6_ADDR_LENGTH];
        u8 dst_addr[ICE_IPV6_ADDR_LENGTH];
};

struct ice_sctp_hdr {
        __be16 src_port;
        __be16 dst_port;
        __be32 verification_tag;
        __be32 check;
};

struct ice_l4_hdr {
        __be16 src_port;
        __be16 dst_port;
        __be16 len;
        __be16 check;
};

struct ice_udp_tnl_hdr {
        __be16 field;
        __be16 proto_type;
        __be32 vni;     /* only use lower 24-bits */
};

struct ice_udp_gtp_hdr {
        u8 flags;
        u8 msg_type;
        __be16 rsrvd_len;
        __be32 teid;
        __be16 rsrvd_seq_nbr;
        u8 rsrvd_n_pdu_nbr;
        u8 rsrvd_next_ext;
        u8 rsvrd_ext_len;
        u8 pdu_type;
        u8 qfi;
        u8 rsvrd;
};

struct ice_nvgre_hdr {
        __be16 flags;
        __be16 protocol;
        __be32 tni_flow;
};

union ice_prot_hdr {
        struct ice_ether_hdr eth_hdr;
        struct ice_ethtype_hdr ethertype;
        struct ice_vlan_hdr vlan_hdr;
        struct ice_ipv4_hdr ipv4_hdr;
        struct ice_ipv6_hdr ipv6_hdr;
        struct ice_l4_hdr l4_hdr;
        struct ice_sctp_hdr sctp_hdr;
        struct ice_udp_tnl_hdr tnl_hdr;
        struct ice_nvgre_hdr nvgre_hdr;
        struct ice_udp_gtp_hdr gtp_hdr;
};

/* This is mapping table entry that maps every word within a given protocol
 * structure to the real byte offset as per the specification of that
 * protocol header.
 * for e.g. dst address is 3 words in ethertype header and corresponding bytes
 * are 0, 2, 3 in the actual packet header and src address is at 4, 6, 8
 */
struct ice_prot_ext_tbl_entry {
        enum ice_protocol_type prot_type;
        /* Byte offset into header of given protocol type */
        u8 offs[sizeof(union ice_prot_hdr)];
};

/* Extractions to be looked up for a given recipe */
struct ice_prot_lkup_ext {
        u16 prot_type;
        u8 n_val_words;
        /* create a buffer to hold max words per recipe */
        u16 field_off[ICE_MAX_CHAIN_WORDS];
        u16 field_mask[ICE_MAX_CHAIN_WORDS];

        struct ice_fv_word fv_words[ICE_MAX_CHAIN_WORDS];

        /* Indicate field offsets that have field vector indices assigned */
        DECLARE_BITMAP(done, ICE_MAX_CHAIN_WORDS);
};

struct ice_pref_recipe_group {
        u8 n_val_pairs;         /* Number of valid pairs */
        struct ice_fv_word pairs[ICE_NUM_WORDS_RECIPE];
        u16 mask[ICE_NUM_WORDS_RECIPE];
};

struct ice_recp_grp_entry {
        struct list_head l_entry;

#define ICE_INVAL_CHAIN_IND 0xFF
        u16 rid;
        u8 chain_idx;
        u16 fv_idx[ICE_NUM_WORDS_RECIPE];
        u16 fv_mask[ICE_NUM_WORDS_RECIPE];
        struct ice_pref_recipe_group r_group;
};
#endif /* _ICE_PROTOCOL_TYPE_H_ */