/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
/* Copyright (C) 2017-2018 Netronome Systems, Inc. */

#ifndef __NFP_FLOWER_H__
#define __NFP_FLOWER_H__ 1

#include "cmsg.h"
#include "../nfp_net.h"

#include <linux/circ_buf.h>
#include <linux/hashtable.h>
#include <linux/rhashtable.h>
#include <linux/time64.h>
#include <linux/types.h>
#include <net/pkt_cls.h>
#include <net/tcp.h>
#include <linux/workqueue.h>
#include <linux/idr.h>

struct nfp_fl_pre_lag;
struct net_device;
struct nfp_app;

#define NFP_FL_STAT_ID_MU_NUM           GENMASK(31, 22)
#define NFP_FL_STAT_ID_STAT             GENMASK(21, 0)

#define NFP_FL_STATS_ELEM_RS            FIELD_SIZEOF(struct nfp_fl_stats_id, \
                                                     init_unalloc)
#define NFP_FLOWER_MASK_ENTRY_RS        256
#define NFP_FLOWER_MASK_ELEMENT_RS      1
#define NFP_FLOWER_MASK_HASH_BITS       10

#define NFP_FL_META_FLAG_MANAGE_MASK    BIT(7)

#define NFP_FL_MASK_REUSE_TIME_NS       40000
#define NFP_FL_MASK_ID_LOCATION         1

/* Extra features bitmap. */
#define NFP_FL_FEATS_GENEVE             BIT(0)
#define NFP_FL_NBI_MTU_SETTING          BIT(1)
#define NFP_FL_FEATS_GENEVE_OPT         BIT(2)
#define NFP_FL_FEATS_VLAN_PCP           BIT(3)
#define NFP_FL_FEATS_VF_RLIM            BIT(4)
#define NFP_FL_FEATS_FLOW_MOD           BIT(5)
#define NFP_FL_FEATS_PRE_TUN_RULES      BIT(6)
#define NFP_FL_FEATS_FLOW_MERGE         BIT(30)
#define NFP_FL_FEATS_LAG                BIT(31)

struct nfp_fl_mask_id {
        struct circ_buf mask_id_free_list;
        ktime_t *last_used;
        u8 init_unallocated;
};

struct nfp_fl_stats_id {
        struct circ_buf free_list;
        u32 init_unalloc;
        u8 repeated_em_count;
};

/**
 * struct nfp_fl_tunnel_offloads - priv data for tunnel offloads
 * @offloaded_macs:     Hashtable of the offloaded MAC addresses
 * @ipv4_off_list:      List of IPv4 addresses to offload
 * @neigh_off_list:     List of neighbour offloads
 * @ipv4_off_lock:      Lock for the IPv4 address list
 * @neigh_off_lock:     Lock for the neighbour address list
 * @mac_off_ids:        IDA to manage id assignment for offloaded MACs
 * @neigh_nb:           Notifier to monitor neighbour state
 */
struct nfp_fl_tunnel_offloads {
        struct rhashtable offloaded_macs;
        struct list_head ipv4_off_list;
        struct list_head neigh_off_list;
        struct mutex ipv4_off_lock;
        spinlock_t neigh_off_lock;
        struct ida mac_off_ids;
        struct notifier_block neigh_nb;
};

/**
 * struct nfp_mtu_conf - manage MTU setting
 * @portnum:            NFP port number of repr with requested MTU change
 * @requested_val:      MTU value requested for repr
 * @ack:                Received ack that MTU has been correctly set
 * @wait_q:             Wait queue for MTU acknowledgements
 * @lock:               Lock for setting/reading MTU variables
 */
struct nfp_mtu_conf {
        u32 portnum;
        unsigned int requested_val;
        bool ack;
        wait_queue_head_t wait_q;
        spinlock_t lock;
};

/**
 * struct nfp_fl_lag - Flower APP priv data for link aggregation
 * @work:               Work queue for writing configs to the HW
 * @lock:               Lock to protect lag_group_list
 * @group_list:         List of all master/slave groups offloaded
 * @ida_handle:         IDA to handle group ids
 * @pkt_num:            Incremented for each config packet sent
 * @batch_ver:          Incremented for each batch of config packets
 * @global_inst:        Instance allocator for groups
 * @rst_cfg:            Marker to reset HW LAG config
 * @retrans_skbs:       Cmsgs that could not be processed by HW and require
 *                      retransmission
 */
struct nfp_fl_lag {
        struct delayed_work work;
        struct mutex lock;
        struct list_head group_list;
        struct ida ida_handle;
        unsigned int pkt_num;
        unsigned int batch_ver;
        u8 global_inst;
        bool rst_cfg;
        struct sk_buff_head retrans_skbs;
};

/**
 * struct nfp_fl_internal_ports - Flower APP priv data for additional ports
 * @port_ids:   Assignment of ids to any additional ports
 * @lock:       Lock for extra ports list
 */
struct nfp_fl_internal_ports {
        struct idr port_ids;
        spinlock_t lock;
};

/**
 * struct nfp_flower_priv - Flower APP per-vNIC priv data
 * @app:                Back pointer to app
 * @nn:                 Pointer to vNIC
 * @mask_id_seed:       Seed used for mask hash table
 * @flower_version:     HW version of flower
 * @flower_ext_feats:   Bitmap of extra features the HW supports
 * @stats_ids:          List of free stats ids
 * @mask_ids:           List of free mask ids
 * @mask_table:         Hash table used to store masks
 * @stats_ring_size:    Maximum number of allowed stats ids
 * @flow_table:         Hash table used to store flower rules
 * @stats:              Stored stats updates for flower rules
 * @stats_lock:         Lock for flower rule stats updates
 * @stats_ctx_table:    Hash table to map stats contexts to its flow rule
 * @cmsg_work:          Workqueue for control messages processing
 * @cmsg_skbs_high:     List of higher priority skbs for control message
 *                      processing
 * @cmsg_skbs_low:      List of lower priority skbs for control message
 *                      processing
 * @tun:                Tunnel offload data
 * @reify_replies:      atomically stores the number of replies received
 *                      from firmware for repr reify
 * @reify_wait_queue:   wait queue for repr reify response counting
 * @mtu_conf:           Configuration of repr MTU value
 * @nfp_lag:            Link aggregation data block
 * @indr_block_cb_priv: List of priv data passed to indirect block cbs
 * @non_repr_priv:      List of offloaded non-repr ports and their priv data
 * @active_mem_unit:    Current active memory unit for flower rules
 * @total_mem_units:    Total number of available memory units for flower rules
 * @internal_ports:     Internal port ids used in offloaded rules
 * @qos_stats_work:     Workqueue for qos stats processing
 * @qos_rate_limiters:  Current active qos rate limiters
 * @qos_stats_lock:     Lock on qos stats updates
 * @pre_tun_rule_cnt:   Number of pre-tunnel rules offloaded
 */
struct nfp_flower_priv {
        struct nfp_app *app;
        struct nfp_net *nn;
        u32 mask_id_seed;
        u64 flower_version;
        u64 flower_ext_feats;
        struct nfp_fl_stats_id stats_ids;
        struct nfp_fl_mask_id mask_ids;
        DECLARE_HASHTABLE(mask_table, NFP_FLOWER_MASK_HASH_BITS);
        u32 stats_ring_size;
        struct rhashtable flow_table;
        struct nfp_fl_stats *stats;
        spinlock_t stats_lock; /* lock stats */
        struct rhashtable stats_ctx_table;
        struct work_struct cmsg_work;
        struct sk_buff_head cmsg_skbs_high;
        struct sk_buff_head cmsg_skbs_low;
        struct nfp_fl_tunnel_offloads tun;
        atomic_t reify_replies;
        wait_queue_head_t reify_wait_queue;
        struct nfp_mtu_conf mtu_conf;
        struct nfp_fl_lag nfp_lag;
        struct list_head indr_block_cb_priv;
        struct list_head non_repr_priv;
        unsigned int active_mem_unit;
        unsigned int total_mem_units;
        struct nfp_fl_internal_ports internal_ports;
        struct delayed_work qos_stats_work;
        unsigned int qos_rate_limiters;
        spinlock_t qos_stats_lock; /* Protect the qos stats */
        int pre_tun_rule_cnt;
};

/**
 * struct nfp_fl_qos - Flower APP priv data for quality of service
 * @netdev_port_id:     NFP port number of repr with qos info
 * @curr_stats:         Currently stored stats updates for qos info
 * @prev_stats:         Previously stored updates for qos info
 * @last_update:        Stored time when last stats were updated
 */
struct nfp_fl_qos {
        u32 netdev_port_id;
        struct nfp_stat_pair curr_stats;
        struct nfp_stat_pair prev_stats;
        u64 last_update;
};

/**
 * struct nfp_flower_repr_priv - Flower APP per-repr priv data
 * @nfp_repr:           Back pointer to nfp_repr
 * @lag_port_flags:     Extended port flags to record lag state of repr
 * @mac_offloaded:      Flag indicating a MAC address is offloaded for repr
 * @offloaded_mac_addr: MAC address that has been offloaded for repr
 * @block_shared:       Flag indicating if offload applies to shared blocks
 * @mac_list:           List entry of reprs that share the same offloaded MAC
 * @qos_table:          Stored info on filters implementing qos
 * @on_bridge:          Indicates if the repr is attached to a bridge
 */
struct nfp_flower_repr_priv {
        struct nfp_repr *nfp_repr;
        unsigned long lag_port_flags;
        bool mac_offloaded;
        u8 offloaded_mac_addr[ETH_ALEN];
        bool block_shared;
        struct list_head mac_list;
        struct nfp_fl_qos qos_table;
        bool on_bridge;
};

/**
 * struct nfp_flower_non_repr_priv - Priv data for non-repr offloaded ports
 * @list:               List entry of offloaded reprs
 * @netdev:             Pointer to non-repr net_device
 * @ref_count:          Number of references held for this priv data
 * @mac_offloaded:      Flag indicating a MAC address is offloaded for device
 * @offloaded_mac_addr: MAC address that has been offloaded for dev
 */
struct nfp_flower_non_repr_priv {
        struct list_head list;
        struct net_device *netdev;
        int ref_count;
        bool mac_offloaded;
        u8 offloaded_mac_addr[ETH_ALEN];
};

struct nfp_fl_key_ls {
        u32 key_layer_two;
        u8 key_layer;
        int key_size;
};

struct nfp_fl_rule_metadata {
        u8 key_len;
        u8 mask_len;
        u8 act_len;
        u8 flags;
        __be32 host_ctx_id;
        __be64 host_cookie __packed;
        __be64 flow_version __packed;
        __be32 shortcut;
};

struct nfp_fl_stats {
        u64 pkts;
        u64 bytes;
        u64 used;
};

struct nfp_fl_payload {
        struct nfp_fl_rule_metadata meta;
        unsigned long tc_flower_cookie;
        struct rhash_head fl_node;
        struct rcu_head rcu;
        __be32 nfp_tun_ipv4_addr;
        struct net_device *ingress_dev;
        char *unmasked_data;
        char *mask_data;
        char *action_data;
        struct list_head linked_flows;
        bool in_hw;
        struct {
                struct net_device *dev;
                __be16 vlan_tci;
                __be16 port_idx;
        } pre_tun_rule;
};

struct nfp_fl_payload_link {
        /* A link contains a pointer to a merge flow and an associated sub_flow.
         * Each merge flow will feature in 2 links to its underlying sub_flows.
         * A sub_flow will have at least 1 link to a merge flow or more if it
         * has been used to create multiple merge flows.
         *
         * For a merge flow, 'linked_flows' in its nfp_fl_payload struct lists
         * all links to sub_flows (sub_flow.flow) via merge.list.
         * For a sub_flow, 'linked_flows' gives all links to merge flows it has
         * formed (merge_flow.flow) via sub_flow.list.
         */
        struct {
                struct list_head list;
                struct nfp_fl_payload *flow;
        } merge_flow, sub_flow;
};

extern const struct rhashtable_params nfp_flower_table_params;

struct nfp_fl_stats_frame {
        __be32 stats_con_id;
        __be32 pkt_count;
        __be64 byte_count;
        __be64 stats_cookie;
};

static inline bool
nfp_flower_internal_port_can_offload(struct nfp_app *app,
                                     struct net_device *netdev)
{
        struct nfp_flower_priv *app_priv = app->priv;

        if (!(app_priv->flower_ext_feats & NFP_FL_FEATS_FLOW_MERGE))
                return false;
        if (!netdev->rtnl_link_ops)
                return false;
        if (!strcmp(netdev->rtnl_link_ops->kind, "openvswitch"))
                return true;

        return false;
}

/* The address of the merged flow acts as its cookie.
 * Cookies supplied to us by TC flower are also addresses to allocated
 * memory and thus this scheme should not generate any collisions.
 */
static inline bool nfp_flower_is_merge_flow(struct nfp_fl_payload *flow_pay)
{
        return flow_pay->tc_flower_cookie == (unsigned long)flow_pay;
}

static inline bool nfp_flower_is_supported_bridge(struct net_device *netdev)
{
        return netif_is_ovs_master(netdev);
}

int nfp_flower_metadata_init(struct nfp_app *app, u64 host_ctx_count,
                             unsigned int host_ctx_split);
void nfp_flower_metadata_cleanup(struct nfp_app *app);

int nfp_flower_setup_tc(struct nfp_app *app, struct net_device *netdev,
                        enum tc_setup_type type, void *type_data);
int nfp_flower_merge_offloaded_flows(struct nfp_app *app,
                                     struct nfp_fl_payload *sub_flow1,
                                     struct nfp_fl_payload *sub_flow2);
int nfp_flower_compile_flow_match(struct nfp_app *app,
                                  struct flow_cls_offload *flow,
                                  struct nfp_fl_key_ls *key_ls,
                                  struct net_device *netdev,
                                  struct nfp_fl_payload *nfp_flow,
                                  enum nfp_flower_tun_type tun_type,
                                  struct netlink_ext_ack *extack);
int nfp_flower_compile_action(struct nfp_app *app,
                              struct flow_cls_offload *flow,
                              struct net_device *netdev,
                              struct nfp_fl_payload *nfp_flow,
                              struct netlink_ext_ack *extack);
int nfp_compile_flow_metadata(struct nfp_app *app,
                              struct flow_cls_offload *flow,
                              struct nfp_fl_payload *nfp_flow,
                              struct net_device *netdev,
                              struct netlink_ext_ack *extack);
void __nfp_modify_flow_metadata(struct nfp_flower_priv *priv,
                                struct nfp_fl_payload *nfp_flow);
int nfp_modify_flow_metadata(struct nfp_app *app,
                             struct nfp_fl_payload *nfp_flow);

struct nfp_fl_payload *
nfp_flower_search_fl_table(struct nfp_app *app, unsigned long tc_flower_cookie,
                           struct net_device *netdev);
struct nfp_fl_payload *
nfp_flower_get_fl_payload_from_ctx(struct nfp_app *app, u32 ctx_id);
struct nfp_fl_payload *
nfp_flower_remove_fl_table(struct nfp_app *app, unsigned long tc_flower_cookie);

void nfp_flower_rx_flow_stats(struct nfp_app *app, struct sk_buff *skb);

int nfp_tunnel_config_start(struct nfp_app *app);
void nfp_tunnel_config_stop(struct nfp_app *app);
int nfp_tunnel_mac_event_handler(struct nfp_app *app,
                                 struct net_device *netdev,
                                 unsigned long event, void *ptr);
void nfp_tunnel_del_ipv4_off(struct nfp_app *app, __be32 ipv4);
void nfp_tunnel_add_ipv4_off(struct nfp_app *app, __be32 ipv4);
void nfp_tunnel_request_route(struct nfp_app *app, struct sk_buff *skb);
void nfp_tunnel_keep_alive(struct nfp_app *app, struct sk_buff *skb);
void nfp_flower_lag_init(struct nfp_fl_lag *lag);
void nfp_flower_lag_cleanup(struct nfp_fl_lag *lag);
int nfp_flower_lag_reset(struct nfp_fl_lag *lag);
int nfp_flower_lag_netdev_event(struct nfp_flower_priv *priv,
                                struct net_device *netdev,
                                unsigned long event, void *ptr);
bool nfp_flower_lag_unprocessed_msg(struct nfp_app *app, struct sk_buff *skb);
int nfp_flower_lag_populate_pre_action(struct nfp_app *app,
                                       struct net_device *master,
                                       struct nfp_fl_pre_lag *pre_act,
                                       struct netlink_ext_ack *extack);
int nfp_flower_lag_get_output_id(struct nfp_app *app,
                                 struct net_device *master);
void nfp_flower_qos_init(struct nfp_app *app);
void nfp_flower_qos_cleanup(struct nfp_app *app);
int nfp_flower_setup_qos_offload(struct nfp_app *app, struct net_device *netdev,
                                 struct tc_cls_matchall_offload *flow);
void nfp_flower_stats_rlim_reply(struct nfp_app *app, struct sk_buff *skb);
int nfp_flower_reg_indir_block_handler(struct nfp_app *app,
                                       struct net_device *netdev,
                                       unsigned long event);

void
__nfp_flower_non_repr_priv_get(struct nfp_flower_non_repr_priv *non_repr_priv);
struct nfp_flower_non_repr_priv *
nfp_flower_non_repr_priv_get(struct nfp_app *app, struct net_device *netdev);
void
__nfp_flower_non_repr_priv_put(struct nfp_flower_non_repr_priv *non_repr_priv);
void
nfp_flower_non_repr_priv_put(struct nfp_app *app, struct net_device *netdev);
u32 nfp_flower_get_port_id_from_netdev(struct nfp_app *app,
                                       struct net_device *netdev);
int nfp_flower_xmit_pre_tun_flow(struct nfp_app *app,
                                 struct nfp_fl_payload *flow);
int nfp_flower_xmit_pre_tun_del_flow(struct nfp_app *app,
                                     struct nfp_fl_payload *flow);
#endif