/*
 * Copyright (c) 2013-2015, Mellanox Technologies, Ltd.  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/mlx5/driver.h>
#include "wq.h"
#include "mlx5_core.h"

int mlx5_wq_cyc_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
                       void *wqc, struct mlx5_wq_cyc *wq,
                       struct mlx5_wq_ctrl *wq_ctrl)
{
        u8 log_wq_stride = MLX5_GET(wq, wqc, log_wq_stride);
        u8 log_wq_sz     = MLX5_GET(wq, wqc, log_wq_sz);
        struct mlx5_frag_buf_ctrl *fbc = &wq->fbc;
        int err;

        err = mlx5_db_alloc_node(mdev, &wq_ctrl->db, param->db_numa_node);
        if (err) {
                mlx5_core_warn(mdev, "mlx5_db_alloc_node() failed, %d\n", err);
                return err;
        }

        wq->db  = wq_ctrl->db.db;

        err = mlx5_frag_buf_alloc_node(mdev, wq_get_byte_sz(log_wq_sz, log_wq_stride),
                                       &wq_ctrl->buf, param->buf_numa_node);
        if (err) {
                mlx5_core_warn(mdev, "mlx5_frag_buf_alloc_node() failed, %d\n", err);
                goto err_db_free;
        }

        mlx5_init_fbc(wq_ctrl->buf.frags, log_wq_stride, log_wq_sz, fbc);
        wq->sz = mlx5_wq_cyc_get_size(wq);

        wq_ctrl->mdev = mdev;

        return 0;

err_db_free:
        mlx5_db_free(mdev, &wq_ctrl->db);

        return err;
}

void mlx5_wq_cyc_wqe_dump(struct mlx5_wq_cyc *wq, u16 ix, u8 nstrides)
{
        size_t len;
        void *wqe;

        if (!net_ratelimit())
                return;

        nstrides = max_t(u8, nstrides, 1);

        len = nstrides << wq->fbc.log_stride;
        wqe = mlx5_wq_cyc_get_wqe(wq, ix);

        pr_info("WQE DUMP: WQ size %d WQ cur size %d, WQE index 0x%x, len: %zu\n",
                mlx5_wq_cyc_get_size(wq), wq->cur_sz, ix, len);
        print_hex_dump(KERN_WARNING, "", DUMP_PREFIX_OFFSET, 16, 1, wqe, len, false);
}

void mlx5_wq_cyc_reset(struct mlx5_wq_cyc *wq)
{
        wq->wqe_ctr = 0;
        wq->cur_sz = 0;
        mlx5_wq_cyc_update_db_record(wq);
}

int mlx5_wq_qp_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
                      void *qpc, struct mlx5_wq_qp *wq,
                      struct mlx5_wq_ctrl *wq_ctrl)
{
        u8 log_rq_stride = MLX5_GET(qpc, qpc, log_rq_stride) + 4;
        u8 log_rq_sz     = MLX5_GET(qpc, qpc, log_rq_size);
        u8 log_sq_stride = ilog2(MLX5_SEND_WQE_BB);
        u8 log_sq_sz     = MLX5_GET(qpc, qpc, log_sq_size);

        u32 rq_byte_size;
        int err;



        err = mlx5_db_alloc_node(mdev, &wq_ctrl->db, param->db_numa_node);
        if (err) {
                mlx5_core_warn(mdev, "mlx5_db_alloc_node() failed, %d\n", err);
                return err;
        }

        err = mlx5_frag_buf_alloc_node(mdev,
                                       wq_get_byte_sz(log_rq_sz, log_rq_stride) +
                                       wq_get_byte_sz(log_sq_sz, log_sq_stride),
                                       &wq_ctrl->buf, param->buf_numa_node);
        if (err) {
                mlx5_core_warn(mdev, "mlx5_frag_buf_alloc_node() failed, %d\n", err);
                goto err_db_free;
        }

        mlx5_init_fbc(wq_ctrl->buf.frags, log_rq_stride, log_rq_sz, &wq->rq.fbc);

        rq_byte_size = wq_get_byte_sz(log_rq_sz, log_rq_stride);

        if (rq_byte_size < PAGE_SIZE) {
                /* SQ starts within the same page of the RQ */
                u16 sq_strides_offset = rq_byte_size / MLX5_SEND_WQE_BB;

                mlx5_init_fbc_offset(wq_ctrl->buf.frags,
                                     log_sq_stride, log_sq_sz, sq_strides_offset,
                                     &wq->sq.fbc);
        } else {
                u16 rq_npages = rq_byte_size >> PAGE_SHIFT;

                mlx5_init_fbc(wq_ctrl->buf.frags + rq_npages,
                              log_sq_stride, log_sq_sz, &wq->sq.fbc);
        }

        wq->rq.db  = &wq_ctrl->db.db[MLX5_RCV_DBR];
        wq->sq.db  = &wq_ctrl->db.db[MLX5_SND_DBR];

        wq_ctrl->mdev = mdev;

        return 0;

err_db_free:
        mlx5_db_free(mdev, &wq_ctrl->db);

        return err;
}

int mlx5_cqwq_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
                     void *cqc, struct mlx5_cqwq *wq,
                     struct mlx5_wq_ctrl *wq_ctrl)
{
        /* CQE_STRIDE_128 and CQE_STRIDE_128_PAD both mean 128B stride */
        u8 log_wq_stride = MLX5_GET(cqc, cqc, cqe_sz) == CQE_STRIDE_64 ? 6 : 7;
        u8 log_wq_sz     = MLX5_GET(cqc, cqc, log_cq_size);
        int err;

        err = mlx5_db_alloc_node(mdev, &wq_ctrl->db, param->db_numa_node);
        if (err) {
                mlx5_core_warn(mdev, "mlx5_db_alloc_node() failed, %d\n", err);
                return err;
        }

        wq->db  = wq_ctrl->db.db;

        err = mlx5_frag_buf_alloc_node(mdev, wq_get_byte_sz(log_wq_sz, log_wq_stride),
                                       &wq_ctrl->buf,
                                       param->buf_numa_node);
        if (err) {
                mlx5_core_warn(mdev, "mlx5_frag_buf_alloc_node() failed, %d\n",
                               err);
                goto err_db_free;
        }

        mlx5_init_fbc(wq_ctrl->buf.frags, log_wq_stride, log_wq_sz, &wq->fbc);

        wq_ctrl->mdev = mdev;

        return 0;

err_db_free:
        mlx5_db_free(mdev, &wq_ctrl->db);

        return err;
}

static void mlx5_wq_ll_init_list(struct mlx5_wq_ll *wq)
{
        struct mlx5_wqe_srq_next_seg *next_seg;
        int i;

        for (i = 0; i < wq->fbc.sz_m1; i++) {
                next_seg = mlx5_wq_ll_get_wqe(wq, i);
                next_seg->next_wqe_index = cpu_to_be16(i + 1);
        }
        next_seg = mlx5_wq_ll_get_wqe(wq, i);
        wq->tail_next = &next_seg->next_wqe_index;
}

int mlx5_wq_ll_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
                      void *wqc, struct mlx5_wq_ll *wq,
                      struct mlx5_wq_ctrl *wq_ctrl)
{
        u8 log_wq_stride = MLX5_GET(wq, wqc, log_wq_stride);
        u8 log_wq_sz     = MLX5_GET(wq, wqc, log_wq_sz);
        struct mlx5_frag_buf_ctrl *fbc = &wq->fbc;
        int err;

        err = mlx5_db_alloc_node(mdev, &wq_ctrl->db, param->db_numa_node);
        if (err) {
                mlx5_core_warn(mdev, "mlx5_db_alloc_node() failed, %d\n", err);
                return err;
        }

        wq->db  = wq_ctrl->db.db;

        err = mlx5_frag_buf_alloc_node(mdev, wq_get_byte_sz(log_wq_sz, log_wq_stride),
                                       &wq_ctrl->buf, param->buf_numa_node);
        if (err) {
                mlx5_core_warn(mdev, "mlx5_frag_buf_alloc_node() failed, %d\n", err);
                goto err_db_free;
        }

        mlx5_init_fbc(wq_ctrl->buf.frags, log_wq_stride, log_wq_sz, fbc);

        mlx5_wq_ll_init_list(wq);
        wq_ctrl->mdev = mdev;

        return 0;

err_db_free:
        mlx5_db_free(mdev, &wq_ctrl->db);

        return err;
}

void mlx5_wq_ll_reset(struct mlx5_wq_ll *wq)
{
        wq->head = 0;
        wq->wqe_ctr = 0;
        wq->cur_sz = 0;
        mlx5_wq_ll_init_list(wq);
        mlx5_wq_ll_update_db_record(wq);
}

void mlx5_wq_destroy(struct mlx5_wq_ctrl *wq_ctrl)
{
        mlx5_frag_buf_free(wq_ctrl->mdev, &wq_ctrl->buf);
        mlx5_db_free(wq_ctrl->mdev, &wq_ctrl->db);
}