/*
 * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

#ifndef __MLX5E_IPSEC_H__
#define __MLX5E_IPSEC_H__

#include <linux/mlx5/device.h>
#include <net/xfrm.h>
#include <linux/idr.h>
#include "lib/aso.h"
#include "lib/devcom.h"

#define MLX5E_IPSEC_SADB_RX_BITS 10
#define MLX5E_IPSEC_ESN_SCOPE_MID 0x80000000L

struct aes_gcm_keymat {
        u64   seq_iv;

        u32   salt;
        u32   icv_len;

        u32   key_len;
        u32   aes_key[256 / 32];
};

struct upspec {
        u16 dport;
        u16 dport_mask;
        u16 sport;
        u16 sport_mask;
        u8 proto;
};

struct mlx5_ipsec_lft {
        u64 hard_packet_limit;
        u64 soft_packet_limit;
        u64 numb_rounds_hard;
        u64 numb_rounds_soft;
};

struct mlx5_replay_esn {
        u32 replay_window;
        u32 esn;
        u32 esn_msb;
        u8 overlap : 1;
        u8 trigger : 1;
};

struct mlx5e_ipsec_addr {
        union {
                __be32 a4;
                __be32 a6[4];
        } saddr;
        union {
                __be32 m4;
                __be32 m6[4];
        } smask;
        union {
                __be32 a4;
                __be32 a6[4];
        } daddr;
        union {
                __be32 m4;
                __be32 m6[4];
        } dmask;
        u8 family;
};

struct mlx5_accel_esp_xfrm_attrs {
        u32   spi;
        u32   mode;
        struct aes_gcm_keymat aes_gcm;
        struct mlx5e_ipsec_addr addrs;
        struct upspec upspec;
        u8 dir : 2;
        u8 type : 2;
        u8 drop : 1;
        u8 encap : 1;
        struct mlx5_replay_esn replay_esn;
        u32 authsize;
        u32 reqid;
        struct mlx5_ipsec_lft lft;
        union {
                u8 smac[ETH_ALEN];
                __be16 sport;
        };
        union {
                u8 dmac[ETH_ALEN];
                __be16 dport;
        };
};

enum mlx5_ipsec_cap {
        MLX5_IPSEC_CAP_CRYPTO           = 1 << 0,
        MLX5_IPSEC_CAP_ESN              = 1 << 1,
        MLX5_IPSEC_CAP_PACKET_OFFLOAD   = 1 << 2,
        MLX5_IPSEC_CAP_ROCE             = 1 << 3,
        MLX5_IPSEC_CAP_PRIO             = 1 << 4,
        MLX5_IPSEC_CAP_TUNNEL           = 1 << 5,
        MLX5_IPSEC_CAP_ESPINUDP         = 1 << 6,
};

struct mlx5e_priv;

struct mlx5e_ipsec_hw_stats {
        u64 ipsec_rx_pkts;
        u64 ipsec_rx_bytes;
        u64 ipsec_rx_drop_pkts;
        u64 ipsec_rx_drop_bytes;
        u64 ipsec_rx_drop_mismatch_sa_sel;
        u64 ipsec_tx_pkts;
        u64 ipsec_tx_bytes;
        u64 ipsec_tx_drop_pkts;
        u64 ipsec_tx_drop_bytes;
};

struct mlx5e_ipsec_sw_stats {
        atomic64_t ipsec_rx_drop_sp_alloc;
        atomic64_t ipsec_rx_drop_sadb_miss;
        atomic64_t ipsec_tx_drop_bundle;
        atomic64_t ipsec_tx_drop_no_state;
        atomic64_t ipsec_tx_drop_not_ip;
        atomic64_t ipsec_tx_drop_trailer;
};

struct mlx5e_ipsec_fc;
struct mlx5e_ipsec_tx;

struct mlx5e_ipsec_work {
        struct work_struct work;
        struct mlx5e_ipsec_sa_entry *sa_entry;
        void *data;
};

struct mlx5e_ipsec_netevent_data {
        u8 addr[ETH_ALEN];
};

struct mlx5e_ipsec_dwork {
        struct delayed_work dwork;
        struct mlx5e_ipsec_sa_entry *sa_entry;
};

struct mlx5e_ipsec_aso {
        u8 __aligned(64) ctx[MLX5_ST_SZ_BYTES(ipsec_aso)];
        dma_addr_t dma_addr;
        struct mlx5_aso *aso;
        /* Protect ASO WQ access, as it is global to whole IPsec */
        spinlock_t lock;
};

struct mlx5e_ipsec_rx_create_attr {
        struct mlx5_flow_namespace *ns;
        struct mlx5_ttc_table *ttc;
        u32 family;
        int prio;
        int pol_level;
        int pol_miss_level;
        int sa_level;
        int status_level;
        enum mlx5_flow_namespace_type chains_ns;
};

struct mlx5e_ipsec_ft {
        struct mutex mutex; /* Protect changes to this struct */
        struct mlx5_flow_table *pol;
        struct mlx5_flow_table *sa;
        struct mlx5_flow_table *sa_sel;
        struct mlx5_flow_table *status;
        u32 refcnt;
};

struct mlx5e_ipsec_drop {
        struct mlx5_flow_handle *rule;
        struct mlx5_fc *fc;
};

struct mlx5e_ipsec_rule {
        struct mlx5_flow_handle *rule;
        struct mlx5_flow_handle *status_pass;
        struct mlx5_flow_handle *sa_sel;
        struct mlx5_modify_hdr *modify_hdr;
        struct mlx5_pkt_reformat *pkt_reformat;
        struct mlx5_fc *fc;
        struct mlx5e_ipsec_drop replay;
        struct mlx5e_ipsec_drop auth;
        struct mlx5e_ipsec_drop trailer;
};

struct mlx5e_ipsec_miss {
        struct mlx5_flow_group *group;
        struct mlx5_flow_handle *rule;
        struct mlx5_fc *fc;
};

struct mlx5e_ipsec_tx_create_attr {
        int prio;
        int pol_level;
        int sa_level;
        int cnt_level;
        enum mlx5_flow_namespace_type chains_ns;
};

struct mlx5e_ipsec_mpv_work {
        int event;
        struct work_struct work;
        struct mlx5e_priv *slave_priv;
        struct mlx5e_priv *master_priv;
};

struct mlx5e_ipsec {
        struct mlx5_core_dev *mdev;
        struct xarray sadb;
        struct mlx5e_ipsec_sw_stats sw_stats;
        struct mlx5e_ipsec_hw_stats hw_stats;
        struct workqueue_struct *wq;
        struct completion comp;
        struct mlx5e_flow_steering *fs;
        struct mlx5e_ipsec_rx *rx_ipv4;
        struct mlx5e_ipsec_rx *rx_ipv6;
        struct mlx5e_ipsec_rx *rx_esw;
        struct mlx5e_ipsec_tx *tx;
        struct mlx5e_ipsec_tx *tx_esw;
        struct mlx5e_ipsec_aso *aso;
        struct notifier_block nb;
        struct notifier_block netevent_nb;
        struct mlx5_ipsec_fs *roce;
        u8 is_uplink_rep: 1;
        struct mlx5e_ipsec_mpv_work mpv_work;
        struct xarray ipsec_obj_id_map;
};

struct mlx5e_ipsec_esn_state {
        u32 esn;
        u32 esn_msb;
        u8 overlap: 1;
};

struct mlx5e_ipsec_limits {
        u64 round;
        u8 soft_limit_hit : 1;
        u8 fix_limit : 1;
};

struct mlx5e_ipsec_sa_entry {
        struct mlx5e_ipsec_esn_state esn_state;
        struct xfrm_state *x;
        struct net_device *dev;
        struct mlx5e_ipsec *ipsec;
        struct mlx5_accel_esp_xfrm_attrs attrs;
        void (*set_iv_op)(struct sk_buff *skb, struct xfrm_state *x,
                          struct xfrm_offload *xo);
        u32 ipsec_obj_id;
        u32 enc_key_id;
        struct mlx5e_ipsec_rule ipsec_rule;
        struct mlx5e_ipsec_work *work;
        struct mlx5e_ipsec_dwork *dwork;
        struct mlx5e_ipsec_limits limits;
        u32 rx_mapped_id;
        u8 ctx[MLX5_ST_SZ_BYTES(ipsec_aso)];
};

struct mlx5_accel_pol_xfrm_attrs {
        struct mlx5e_ipsec_addr addrs;
        struct upspec upspec;
        u8 action;
        u8 type : 2;
        u8 dir : 2;
        u32 reqid;
        u32 prio;
};

struct mlx5e_ipsec_pol_entry {
        struct xfrm_policy *x;
        struct mlx5e_ipsec *ipsec;
        struct mlx5e_ipsec_rule ipsec_rule;
        struct mlx5_accel_pol_xfrm_attrs attrs;
};

#ifdef CONFIG_MLX5_EN_IPSEC

void mlx5e_ipsec_init(struct mlx5e_priv *priv);
void mlx5e_ipsec_cleanup(struct mlx5e_priv *priv);
void mlx5e_ipsec_build_netdev(struct mlx5e_priv *priv);

void mlx5e_accel_ipsec_fs_cleanup(struct mlx5e_ipsec *ipsec);
int mlx5e_accel_ipsec_fs_init(struct mlx5e_ipsec *ipsec, struct mlx5_devcom_comp_dev **devcom);
int mlx5e_accel_ipsec_fs_add_rule(struct mlx5e_ipsec_sa_entry *sa_entry);
void mlx5e_accel_ipsec_fs_del_rule(struct mlx5e_ipsec_sa_entry *sa_entry);
int mlx5e_accel_ipsec_fs_add_pol(struct mlx5e_ipsec_pol_entry *pol_entry);
void mlx5e_accel_ipsec_fs_del_pol(struct mlx5e_ipsec_pol_entry *pol_entry);
void mlx5e_accel_ipsec_fs_modify(struct mlx5e_ipsec_sa_entry *sa_entry);
bool mlx5e_ipsec_fs_tunnel_allowed(struct mlx5e_ipsec_sa_entry *sa_entry);

int mlx5_ipsec_create_sa_ctx(struct mlx5e_ipsec_sa_entry *sa_entry);
void mlx5_ipsec_free_sa_ctx(struct mlx5e_ipsec_sa_entry *sa_entry);

u32 mlx5_ipsec_device_caps(struct mlx5_core_dev *mdev);

void mlx5_accel_esp_modify_xfrm(struct mlx5e_ipsec_sa_entry *sa_entry,
                                const struct mlx5_accel_esp_xfrm_attrs *attrs);

int mlx5e_ipsec_aso_init(struct mlx5e_ipsec *ipsec);
void mlx5e_ipsec_aso_cleanup(struct mlx5e_ipsec *ipsec);

int mlx5e_ipsec_aso_query(struct mlx5e_ipsec_sa_entry *sa_entry,
                          struct mlx5_wqe_aso_ctrl_seg *data);
void mlx5e_accel_ipsec_fs_read_stats(struct mlx5e_priv *priv,
                                     void *ipsec_stats);

void mlx5e_ipsec_build_accel_xfrm_attrs(struct mlx5e_ipsec_sa_entry *sa_entry,
                                        struct mlx5_accel_esp_xfrm_attrs *attrs);
void mlx5e_ipsec_handle_mpv_event(int event, struct mlx5e_priv *slave_priv,
                                  struct mlx5e_priv *master_priv);
void mlx5e_ipsec_send_event(struct mlx5e_priv *priv, int event);
void mlx5e_ipsec_disable_events(struct mlx5e_priv *priv);

static inline struct mlx5_core_dev *
mlx5e_ipsec_sa2dev(struct mlx5e_ipsec_sa_entry *sa_entry)
{
        return sa_entry->ipsec->mdev;
}

static inline struct mlx5_core_dev *
mlx5e_ipsec_pol2dev(struct mlx5e_ipsec_pol_entry *pol_entry)
{
        return pol_entry->ipsec->mdev;
}

static inline bool addr6_all_zero(__be32 *addr6)
{
        static const __be32 zaddr6[4] = {};

        return !memcmp(addr6, zaddr6, sizeof(zaddr6));
}
#else
static inline void mlx5e_ipsec_init(struct mlx5e_priv *priv)
{
}

static inline void mlx5e_ipsec_cleanup(struct mlx5e_priv *priv)
{
}

static inline void mlx5e_ipsec_build_netdev(struct mlx5e_priv *priv)
{
}

static inline u32 mlx5_ipsec_device_caps(struct mlx5_core_dev *mdev)
{
        return 0;
}

static inline void mlx5e_ipsec_handle_mpv_event(int event, struct mlx5e_priv *slave_priv,
                                                struct mlx5e_priv *master_priv)
{
}

static inline void mlx5e_ipsec_send_event(struct mlx5e_priv *priv, int event)
{
}

static inline void mlx5e_ipsec_disable_events(struct mlx5e_priv *priv)
{
}
#endif

#endif  /* __MLX5E_IPSEC_H__ */