/*
 * Copyright (c) 2018 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.
 *
 */

#include <linux/netdevice.h>
#include <net/ipv6.h>
#include "en_accel/tls.h"
#include "accel/tls.h"

static void mlx5e_tls_set_ipv4_flow(void *flow, struct sock *sk)
{
        struct inet_sock *inet = inet_sk(sk);

        MLX5_SET(tls_flow, flow, ipv6, 0);
        memcpy(MLX5_ADDR_OF(tls_flow, flow, dst_ipv4_dst_ipv6.ipv4_layout.ipv4),
               &inet->inet_daddr, MLX5_FLD_SZ_BYTES(ipv4_layout, ipv4));
        memcpy(MLX5_ADDR_OF(tls_flow, flow, src_ipv4_src_ipv6.ipv4_layout.ipv4),
               &inet->inet_rcv_saddr, MLX5_FLD_SZ_BYTES(ipv4_layout, ipv4));
}

#if IS_ENABLED(CONFIG_IPV6)
static void mlx5e_tls_set_ipv6_flow(void *flow, struct sock *sk)
{
        struct ipv6_pinfo *np = inet6_sk(sk);

        MLX5_SET(tls_flow, flow, ipv6, 1);
        memcpy(MLX5_ADDR_OF(tls_flow, flow, dst_ipv4_dst_ipv6.ipv6_layout.ipv6),
               &sk->sk_v6_daddr, MLX5_FLD_SZ_BYTES(ipv6_layout, ipv6));
        memcpy(MLX5_ADDR_OF(tls_flow, flow, src_ipv4_src_ipv6.ipv6_layout.ipv6),
               &np->saddr, MLX5_FLD_SZ_BYTES(ipv6_layout, ipv6));
}
#endif

static void mlx5e_tls_set_flow_tcp_ports(void *flow, struct sock *sk)
{
        struct inet_sock *inet = inet_sk(sk);

        memcpy(MLX5_ADDR_OF(tls_flow, flow, src_port), &inet->inet_sport,
               MLX5_FLD_SZ_BYTES(tls_flow, src_port));
        memcpy(MLX5_ADDR_OF(tls_flow, flow, dst_port), &inet->inet_dport,
               MLX5_FLD_SZ_BYTES(tls_flow, dst_port));
}

static int mlx5e_tls_set_flow(void *flow, struct sock *sk, u32 caps)
{
        switch (sk->sk_family) {
        case AF_INET:
                mlx5e_tls_set_ipv4_flow(flow, sk);
                break;
#if IS_ENABLED(CONFIG_IPV6)
        case AF_INET6:
                if (!sk->sk_ipv6only &&
                    ipv6_addr_type(&sk->sk_v6_daddr) == IPV6_ADDR_MAPPED) {
                        mlx5e_tls_set_ipv4_flow(flow, sk);
                        break;
                }
                if (!(caps & MLX5_ACCEL_TLS_IPV6))
                        goto error_out;

                mlx5e_tls_set_ipv6_flow(flow, sk);
                break;
#endif
        default:
                goto error_out;
        }

        mlx5e_tls_set_flow_tcp_ports(flow, sk);
        return 0;
error_out:
        return -EINVAL;
}

static int mlx5e_tls_add(struct net_device *netdev, struct sock *sk,
                         enum tls_offload_ctx_dir direction,
                         struct tls_crypto_info *crypto_info,
                         u32 start_offload_tcp_sn)
{
        struct mlx5e_priv *priv = netdev_priv(netdev);
        struct tls_context *tls_ctx = tls_get_ctx(sk);
        struct mlx5_core_dev *mdev = priv->mdev;
        u32 caps = mlx5_accel_tls_device_caps(mdev);
        int ret = -ENOMEM;
        void *flow;
        u32 swid;

        flow = kzalloc(MLX5_ST_SZ_BYTES(tls_flow), GFP_KERNEL);
        if (!flow)
                return ret;

        ret = mlx5e_tls_set_flow(flow, sk, caps);
        if (ret)
                goto free_flow;

        ret = mlx5_accel_tls_add_flow(mdev, flow, crypto_info,
                                      start_offload_tcp_sn, &swid,
                                      direction == TLS_OFFLOAD_CTX_DIR_TX);
        if (ret < 0)
                goto free_flow;

        if (direction == TLS_OFFLOAD_CTX_DIR_TX) {
                struct mlx5e_tls_offload_context_tx *tx_ctx =
                    mlx5e_get_tls_tx_context(tls_ctx);

                tx_ctx->swid = htonl(swid);
                tx_ctx->expected_seq = start_offload_tcp_sn;
        } else {
                struct mlx5e_tls_offload_context_rx *rx_ctx =
                    mlx5e_get_tls_rx_context(tls_ctx);

                rx_ctx->handle = htonl(swid);
        }

        return 0;
free_flow:
        kfree(flow);
        return ret;
}

static void mlx5e_tls_del(struct net_device *netdev,
                          struct tls_context *tls_ctx,
                          enum tls_offload_ctx_dir direction)
{
        struct mlx5e_priv *priv = netdev_priv(netdev);
        unsigned int handle;

        handle = ntohl((direction == TLS_OFFLOAD_CTX_DIR_TX) ?
                       mlx5e_get_tls_tx_context(tls_ctx)->swid :
                       mlx5e_get_tls_rx_context(tls_ctx)->handle);

        mlx5_accel_tls_del_flow(priv->mdev, handle,
                                direction == TLS_OFFLOAD_CTX_DIR_TX);
}

static int mlx5e_tls_resync(struct net_device *netdev, struct sock *sk,
                            u32 seq, u8 *rcd_sn_data,
                            enum tls_offload_ctx_dir direction)
{
        struct tls_context *tls_ctx = tls_get_ctx(sk);
        struct mlx5e_priv *priv = netdev_priv(netdev);
        struct mlx5e_tls_offload_context_rx *rx_ctx;
        u64 rcd_sn = *(u64 *)rcd_sn_data;

        if (WARN_ON_ONCE(direction != TLS_OFFLOAD_CTX_DIR_RX))
                return -EINVAL;
        rx_ctx = mlx5e_get_tls_rx_context(tls_ctx);

        netdev_info(netdev, "resyncing seq %d rcd %lld\n", seq,
                    be64_to_cpu(rcd_sn));
        mlx5_accel_tls_resync_rx(priv->mdev, rx_ctx->handle, seq, rcd_sn);
        atomic64_inc(&priv->tls->sw_stats.rx_tls_resync_reply);

        return 0;
}

static const struct tlsdev_ops mlx5e_tls_ops = {
        .tls_dev_add = mlx5e_tls_add,
        .tls_dev_del = mlx5e_tls_del,
        .tls_dev_resync = mlx5e_tls_resync,
};

void mlx5e_tls_build_netdev(struct mlx5e_priv *priv)
{
        struct net_device *netdev = priv->netdev;
        u32 caps;

        if (mlx5_accel_is_ktls_device(priv->mdev)) {
                mlx5e_ktls_build_netdev(priv);
                return;
        }

        if (!mlx5_accel_is_tls_device(priv->mdev))
                return;

        caps = mlx5_accel_tls_device_caps(priv->mdev);
        if (caps & MLX5_ACCEL_TLS_TX) {
                netdev->features          |= NETIF_F_HW_TLS_TX;
                netdev->hw_features       |= NETIF_F_HW_TLS_TX;
        }

        if (caps & MLX5_ACCEL_TLS_RX) {
                netdev->features          |= NETIF_F_HW_TLS_RX;
                netdev->hw_features       |= NETIF_F_HW_TLS_RX;
        }

        if (!(caps & MLX5_ACCEL_TLS_LRO)) {
                netdev->features          &= ~NETIF_F_LRO;
                netdev->hw_features       &= ~NETIF_F_LRO;
        }

        netdev->tlsdev_ops = &mlx5e_tls_ops;
}

int mlx5e_tls_init(struct mlx5e_priv *priv)
{
        struct mlx5e_tls *tls = kzalloc(sizeof(*tls), GFP_KERNEL);

        if (!tls)
                return -ENOMEM;

        priv->tls = tls;
        return 0;
}

void mlx5e_tls_cleanup(struct mlx5e_priv *priv)
{
        struct mlx5e_tls *tls = priv->tls;

        if (!tls)
                return;

        kfree(tls);
        priv->tls = NULL;
}