/*
 * Copyright (c) 2013-2015, 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/kernel.h>
#include <linux/module.h>
#include <linux/mlx5/driver.h>
#include <linux/mlx5/cmd.h>
#include <linux/mlx5/srq.h>
#include <rdma/ib_verbs.h>
#include "mlx5_core.h"
#include "transobj.h"

void mlx5_srq_event(struct mlx5_core_dev *dev, u32 srqn, int event_type)
{
	struct mlx5_srq_table *table = &dev->priv.srq_table;
	struct mlx5_core_srq *srq;

	spin_lock(&table->lock);

	srq = radix_tree_lookup(&table->tree, srqn);
	if (srq)
		atomic_inc(&srq->refcount);

	spin_unlock(&table->lock);

	if (!srq) {
		mlx5_core_warn(dev, "Async event for bogus SRQ 0x%08x\n", srqn);
		return;
	}

	srq->event(srq, event_type);

	if (atomic_dec_and_test(&srq->refcount))
		complete(&srq->free);
}

static int get_pas_size(void *srqc)
{
	u32 log_page_size = MLX5_GET(srqc, srqc, log_page_size) + 12;
	u32 log_srq_size  = MLX5_GET(srqc, srqc, log_srq_size);
	u32 log_rq_stride = MLX5_GET(srqc, srqc, log_rq_stride);
	u32 page_offset   = MLX5_GET(srqc, srqc, page_offset);
	u32 po_quanta	  = 1 << (log_page_size - 6);
	u32 rq_sz	  = 1 << (log_srq_size + 4 + log_rq_stride);
	u32 page_size	  = 1 << log_page_size;
	u32 rq_sz_po      = rq_sz + (page_offset * po_quanta);
	u32 rq_num_pas	  = (rq_sz_po + page_size - 1) / page_size;

	return rq_num_pas * sizeof(u64);
}

static void rmpc_srqc_reformat(void *srqc, void *rmpc, bool srqc_to_rmpc)
{
	void *wq = MLX5_ADDR_OF(rmpc, rmpc, wq);

	if (srqc_to_rmpc) {
		switch (MLX5_GET(srqc, srqc, state)) {
		case MLX5_SRQC_STATE_GOOD:
			MLX5_SET(rmpc, rmpc, state, MLX5_RMPC_STATE_RDY);
			break;
		case MLX5_SRQC_STATE_ERROR:
			MLX5_SET(rmpc, rmpc, state, MLX5_RMPC_STATE_ERR);
			break;
		default:
			pr_warn("%s: %d: Unknown srq state = 0x%x\n", __func__,
				__LINE__, MLX5_GET(srqc, srqc, state));
			MLX5_SET(rmpc, rmpc, state, MLX5_GET(srqc, srqc, state));
		}

		MLX5_SET(wq,   wq, wq_signature,  MLX5_GET(srqc,  srqc, wq_signature));
		MLX5_SET(wq,   wq, log_wq_pg_sz,  MLX5_GET(srqc,  srqc, log_page_size));
		MLX5_SET(wq,   wq, log_wq_stride, MLX5_GET(srqc,  srqc, log_rq_stride) + 4);
		MLX5_SET(wq,   wq, log_wq_sz,     MLX5_GET(srqc,  srqc, log_srq_size));
		MLX5_SET(wq,   wq, page_offset,   MLX5_GET(srqc,  srqc, page_offset));
		MLX5_SET(wq,   wq, lwm,           MLX5_GET(srqc,  srqc, lwm));
		MLX5_SET(wq,   wq, pd,            MLX5_GET(srqc,  srqc, pd));
		MLX5_SET64(wq, wq, dbr_addr, MLX5_GET64(srqc,	  srqc, dbr_addr));
	} else {
		switch (MLX5_GET(rmpc, rmpc, state)) {
		case MLX5_RMPC_STATE_RDY:
			MLX5_SET(srqc, srqc, state, MLX5_SRQC_STATE_GOOD);
			break;
		case MLX5_RMPC_STATE_ERR:
			MLX5_SET(srqc, srqc, state, MLX5_SRQC_STATE_ERROR);
			break;
		default:
			pr_warn("%s: %d: Unknown rmp state = 0x%x\n",
				__func__, __LINE__,
				MLX5_GET(rmpc, rmpc, state));
			MLX5_SET(srqc, srqc, state,
				 MLX5_GET(rmpc, rmpc, state));
		}

		MLX5_SET(srqc,   srqc, wq_signature,   MLX5_GET(wq,   wq, wq_signature));
		MLX5_SET(srqc,   srqc, log_page_size,  MLX5_GET(wq,   wq, log_wq_pg_sz));
		MLX5_SET(srqc,   srqc, log_rq_stride,  MLX5_GET(wq,   wq, log_wq_stride) - 4);
		MLX5_SET(srqc,   srqc, log_srq_size,   MLX5_GET(wq,   wq, log_wq_sz));
		MLX5_SET(srqc,   srqc, page_offset,    MLX5_GET(wq,   wq, page_offset));
		MLX5_SET(srqc,   srqc, lwm,	       MLX5_GET(wq,   wq, lwm));
		MLX5_SET(srqc,   srqc, pd,	       MLX5_GET(wq,   wq, pd));
		MLX5_SET64(srqc, srqc, dbr_addr,       MLX5_GET64(wq, wq, dbr_addr));
	}
}

struct mlx5_core_srq *mlx5_core_get_srq(struct mlx5_core_dev *dev, u32 srqn)
{
	struct mlx5_srq_table *table = &dev->priv.srq_table;
	struct mlx5_core_srq *srq;

	spin_lock(&table->lock);

	srq = radix_tree_lookup(&table->tree, srqn);
	if (srq)
		atomic_inc(&srq->refcount);

	spin_unlock(&table->lock);

	return srq;
}
EXPORT_SYMBOL(mlx5_core_get_srq);

static int create_srq_cmd(struct mlx5_core_dev *dev, struct mlx5_core_srq *srq,
			  struct mlx5_create_srq_mbox_in *in, int inlen)
{
	struct mlx5_create_srq_mbox_out out;
	int err;

	memset(&out, 0, sizeof(out));

	in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_CREATE_SRQ);

	err = mlx5_cmd_exec_check_status(dev, (u32 *)in, inlen, (u32 *)(&out),
					 sizeof(out));

	srq->srqn = be32_to_cpu(out.srqn) & 0xffffff;

	return err;
}

static int destroy_srq_cmd(struct mlx5_core_dev *dev,
			   struct mlx5_core_srq *srq)
{
	struct mlx5_destroy_srq_mbox_in in;
	struct mlx5_destroy_srq_mbox_out out;

	memset(&in, 0, sizeof(in));
	memset(&out, 0, sizeof(out));
	in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_DESTROY_SRQ);
	in.srqn = cpu_to_be32(srq->srqn);

	return mlx5_cmd_exec_check_status(dev, (u32 *)(&in), sizeof(in),
					  (u32 *)(&out), sizeof(out));
}

static int arm_srq_cmd(struct mlx5_core_dev *dev, struct mlx5_core_srq *srq,
		       u16 lwm, int is_srq)
{
	struct mlx5_arm_srq_mbox_in	in;
	struct mlx5_arm_srq_mbox_out	out;

	memset(&in, 0, sizeof(in));
	memset(&out, 0, sizeof(out));

	in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_ARM_RQ);
	in.hdr.opmod = cpu_to_be16(!!is_srq);
	in.srqn = cpu_to_be32(srq->srqn);
	in.lwm = cpu_to_be16(lwm);

	return mlx5_cmd_exec_check_status(dev, (u32 *)(&in),
					  sizeof(in), (u32 *)(&out),
					  sizeof(out));
}

static int query_srq_cmd(struct mlx5_core_dev *dev, struct mlx5_core_srq *srq,
			 struct mlx5_query_srq_mbox_out *out)
{
	struct mlx5_query_srq_mbox_in in;

	memset(&in, 0, sizeof(in));

	in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_QUERY_SRQ);
	in.srqn = cpu_to_be32(srq->srqn);

	return mlx5_cmd_exec_check_status(dev, (u32 *)(&in), sizeof(in),
					  (u32 *)out, sizeof(*out));
}

static int create_xrc_srq_cmd(struct mlx5_core_dev *dev,
			      struct mlx5_core_srq *srq,
			      struct mlx5_create_srq_mbox_in *in,
			      int srq_inlen)
{
	u32 create_out[MLX5_ST_SZ_DW(create_xrc_srq_out)];
	void *create_in;
	void *srqc;
	void *xrc_srqc;
	void *pas;
	int pas_size;
	int inlen;
	int err;

	srqc	  = MLX5_ADDR_OF(create_srq_in, in, srq_context_entry);
	pas_size  = get_pas_size(srqc);
	inlen	  = MLX5_ST_SZ_BYTES(create_xrc_srq_in) + pas_size;
	create_in = mlx5_vzalloc(inlen);
	if (!create_in)
		return -ENOMEM;

	xrc_srqc = MLX5_ADDR_OF(create_xrc_srq_in, create_in,
				xrc_srq_context_entry);
	pas	 = MLX5_ADDR_OF(create_xrc_srq_in, create_in, pas);

	memcpy(xrc_srqc, srqc, MLX5_ST_SZ_BYTES(srqc));
	memcpy(pas, in->pas, pas_size);
	/* 0xffffff means we ask to work with cqe version 0 */
	MLX5_SET(xrc_srqc,	    xrc_srqc,  user_index, 0xffffff);
	MLX5_SET(create_xrc_srq_in, create_in, opcode,
		 MLX5_CMD_OP_CREATE_XRC_SRQ);

	memset(create_out, 0, sizeof(create_out));
	err = mlx5_cmd_exec_check_status(dev, create_in, inlen, create_out,
					 sizeof(create_out));
	if (err)
		goto out;

	srq->srqn = MLX5_GET(create_xrc_srq_out, create_out, xrc_srqn);
out:
	kvfree(create_in);
	return err;
}

static int destroy_xrc_srq_cmd(struct mlx5_core_dev *dev,
			       struct mlx5_core_srq *srq)
{
	u32 xrcsrq_in[MLX5_ST_SZ_DW(destroy_xrc_srq_in)];
	u32 xrcsrq_out[MLX5_ST_SZ_DW(destroy_xrc_srq_out)];

	memset(xrcsrq_in, 0, sizeof(xrcsrq_in));
	memset(xrcsrq_out, 0, sizeof(xrcsrq_out));

	MLX5_SET(destroy_xrc_srq_in, xrcsrq_in, opcode,
		 MLX5_CMD_OP_DESTROY_XRC_SRQ);
	MLX5_SET(destroy_xrc_srq_in, xrcsrq_in, xrc_srqn, srq->srqn);

	return mlx5_cmd_exec_check_status(dev, xrcsrq_in, sizeof(xrcsrq_in),
					  xrcsrq_out, sizeof(xrcsrq_out));
}

static int arm_xrc_srq_cmd(struct mlx5_core_dev *dev,
			   struct mlx5_core_srq *srq, u16 lwm)
{
	u32 xrcsrq_in[MLX5_ST_SZ_DW(arm_xrc_srq_in)];
	u32 xrcsrq_out[MLX5_ST_SZ_DW(arm_xrc_srq_out)];

	memset(xrcsrq_in, 0, sizeof(xrcsrq_in));
	memset(xrcsrq_out, 0, sizeof(xrcsrq_out));

	MLX5_SET(arm_xrc_srq_in, xrcsrq_in, opcode,   MLX5_CMD_OP_ARM_XRC_SRQ);
	MLX5_SET(arm_xrc_srq_in, xrcsrq_in, op_mod,   MLX5_ARM_XRC_SRQ_IN_OP_MOD_XRC_SRQ);
	MLX5_SET(arm_xrc_srq_in, xrcsrq_in, xrc_srqn, srq->srqn);
	MLX5_SET(arm_xrc_srq_in, xrcsrq_in, lwm,      lwm);

	return  mlx5_cmd_exec_check_status(dev, xrcsrq_in, sizeof(xrcsrq_in),
					   xrcsrq_out, sizeof(xrcsrq_out));
}

static int query_xrc_srq_cmd(struct mlx5_core_dev *dev,
			     struct mlx5_core_srq *srq,
			     struct mlx5_query_srq_mbox_out *out)
{
	u32 xrcsrq_in[MLX5_ST_SZ_DW(query_xrc_srq_in)];
	u32 *xrcsrq_out;
	void *srqc;
	void *xrc_srqc;
	int err;

	xrcsrq_out = mlx5_vzalloc(MLX5_ST_SZ_BYTES(query_xrc_srq_out));
	if (!xrcsrq_out)
		return -ENOMEM;
	memset(xrcsrq_in, 0, sizeof(xrcsrq_in));

	MLX5_SET(query_xrc_srq_in, xrcsrq_in, opcode,
		 MLX5_CMD_OP_QUERY_XRC_SRQ);
	MLX5_SET(query_xrc_srq_in, xrcsrq_in, xrc_srqn, srq->srqn);
	err =  mlx5_cmd_exec_check_status(dev, xrcsrq_in, sizeof(xrcsrq_in),
					  xrcsrq_out,
					  MLX5_ST_SZ_BYTES(query_xrc_srq_out));
	if (err)
		goto out;

	xrc_srqc = MLX5_ADDR_OF(query_xrc_srq_out, xrcsrq_out,
				xrc_srq_context_entry);
	srqc = MLX5_ADDR_OF(query_srq_out, out, srq_context_entry);
	memcpy(srqc, xrc_srqc, MLX5_ST_SZ_BYTES(srqc));

out:
	kvfree(xrcsrq_out);
	return err;
}

static int create_rmp_cmd(struct mlx5_core_dev *dev, struct mlx5_core_srq *srq,
			  struct mlx5_create_srq_mbox_in *in, int srq_inlen)
{
	void *create_in;
	void *rmpc;
	void *srqc;
	int pas_size;
	int inlen;
	int err;

	srqc = MLX5_ADDR_OF(create_srq_in, in, srq_context_entry);
	pas_size = get_pas_size(srqc);
	inlen = MLX5_ST_SZ_BYTES(create_rmp_in) + pas_size;
	create_in = mlx5_vzalloc(inlen);
	if (!create_in)
		return -ENOMEM;

	rmpc = MLX5_ADDR_OF(create_rmp_in, create_in, ctx);

	memcpy(MLX5_ADDR_OF(rmpc, rmpc, wq.pas), in->pas, pas_size);
	rmpc_srqc_reformat(srqc, rmpc, true);

	err = mlx5_core_create_rmp(dev, create_in, inlen, &srq->srqn);

	kvfree(create_in);
	return err;
}

static int destroy_rmp_cmd(struct mlx5_core_dev *dev,
			   struct mlx5_core_srq *srq)
{
	return mlx5_core_destroy_rmp(dev, srq->srqn);
}

static int arm_rmp_cmd(struct mlx5_core_dev *dev,
		       struct mlx5_core_srq *srq,
		       u16 lwm)
{
	void *in;
	void *rmpc;
	void *wq;
	void *bitmask;
	int err;

	in = mlx5_vzalloc(MLX5_ST_SZ_BYTES(modify_rmp_in));
	if (!in)
		return -ENOMEM;

	rmpc =	  MLX5_ADDR_OF(modify_rmp_in,   in,   ctx);
	bitmask = MLX5_ADDR_OF(modify_rmp_in,   in,   bitmask);
	wq   =	  MLX5_ADDR_OF(rmpc,	        rmpc, wq);

	MLX5_SET(modify_rmp_in, in,	 rmp_state, MLX5_RMPC_STATE_RDY);
	MLX5_SET(modify_rmp_in, in,	 rmpn,      srq->srqn);
	MLX5_SET(wq,		wq,	 lwm,	    lwm);
	MLX5_SET(rmp_bitmask,	bitmask, lwm,	    1);
	MLX5_SET(rmpc, rmpc, state, MLX5_RMPC_STATE_RDY);

	err = mlx5_core_modify_rmp(dev, in, MLX5_ST_SZ_BYTES(modify_rmp_in));

	kvfree(in);
	return err;
}

static int query_rmp_cmd(struct mlx5_core_dev *dev, struct mlx5_core_srq *srq,
			 struct mlx5_query_srq_mbox_out *out)
{
	u32 *rmp_out;
	void *rmpc;
	void *srqc;
	int err;

	rmp_out =  mlx5_vzalloc(MLX5_ST_SZ_BYTES(query_rmp_out));
	if (!rmp_out)
		return -ENOMEM;

	err = mlx5_core_query_rmp(dev, srq->srqn, rmp_out);
	if (err)
		goto out;

	srqc = MLX5_ADDR_OF(query_srq_out, out,	    srq_context_entry);
	rmpc = MLX5_ADDR_OF(query_rmp_out, rmp_out, rmp_context);
	rmpc_srqc_reformat(srqc, rmpc, false);

out:
	kvfree(rmp_out);
	return err;
}

static int create_srq_split(struct mlx5_core_dev *dev,
			    struct mlx5_core_srq *srq,
			    struct mlx5_create_srq_mbox_in *in,
			    int inlen, int is_xrc)
{
	if (!dev->issi)
		return create_srq_cmd(dev, srq, in, inlen);
	else if (srq->common.res == MLX5_RES_XSRQ)
		return create_xrc_srq_cmd(dev, srq, in, inlen);
	else
		return create_rmp_cmd(dev, srq, in, inlen);
}

static int destroy_srq_split(struct mlx5_core_dev *dev,
			     struct mlx5_core_srq *srq)
{
	if (!dev->issi)
		return destroy_srq_cmd(dev, srq);
	else if (srq->common.res == MLX5_RES_XSRQ)
		return destroy_xrc_srq_cmd(dev, srq);
	else
		return destroy_rmp_cmd(dev, srq);
}

int mlx5_core_create_srq(struct mlx5_core_dev *dev, struct mlx5_core_srq *srq,
			 struct mlx5_create_srq_mbox_in *in, int inlen,
			 int is_xrc)
{
	int err;
	struct mlx5_srq_table *table = &dev->priv.srq_table;

	srq->common.res = is_xrc ? MLX5_RES_XSRQ : MLX5_RES_SRQ;

	err = create_srq_split(dev, srq, in, inlen, is_xrc);
	if (err)
		return err;

	atomic_set(&srq->refcount, 1);
	init_completion(&srq->free);

	spin_lock_irq(&table->lock);
	err = radix_tree_insert(&table->tree, srq->srqn, srq);
	spin_unlock_irq(&table->lock);
	if (err) {
		mlx5_core_warn(dev, "err %d, srqn 0x%x\n", err, srq->srqn);
		goto err_destroy_srq_split;
	}

	return 0;

err_destroy_srq_split:
	destroy_srq_split(dev, srq);

	return err;
}
EXPORT_SYMBOL(mlx5_core_create_srq);

int mlx5_core_destroy_srq(struct mlx5_core_dev *dev, struct mlx5_core_srq *srq)
{
	struct mlx5_srq_table *table = &dev->priv.srq_table;
	struct mlx5_core_srq *tmp;
	int err;

	spin_lock_irq(&table->lock);
	tmp = radix_tree_delete(&table->tree, srq->srqn);
	spin_unlock_irq(&table->lock);
	if (!tmp) {
		mlx5_core_warn(dev, "srq 0x%x not found in tree\n", srq->srqn);
		return -EINVAL;
	}
	if (tmp != srq) {
		mlx5_core_warn(dev, "corruption on srqn 0x%x\n", srq->srqn);
		return -EINVAL;
	}

	err = destroy_srq_split(dev, srq);
	if (err)
		return err;

	if (atomic_dec_and_test(&srq->refcount))
		complete(&srq->free);
	wait_for_completion(&srq->free);

	return 0;
}
EXPORT_SYMBOL(mlx5_core_destroy_srq);

int mlx5_core_query_srq(struct mlx5_core_dev *dev, struct mlx5_core_srq *srq,
			struct mlx5_query_srq_mbox_out *out)
{
	if (!dev->issi)
		return query_srq_cmd(dev, srq, out);
	else if (srq->common.res == MLX5_RES_XSRQ)
		return query_xrc_srq_cmd(dev, srq, out);
	else
		return query_rmp_cmd(dev, srq, out);
}
EXPORT_SYMBOL(mlx5_core_query_srq);

int mlx5_core_arm_srq(struct mlx5_core_dev *dev, struct mlx5_core_srq *srq,
		      u16 lwm, int is_srq)
{
	if (!dev->issi)
		return arm_srq_cmd(dev, srq, lwm, is_srq);
	else if (srq->common.res == MLX5_RES_XSRQ)
		return arm_xrc_srq_cmd(dev, srq, lwm);
	else
		return arm_rmp_cmd(dev, srq, lwm);
}
EXPORT_SYMBOL(mlx5_core_arm_srq);

void mlx5_init_srq_table(struct mlx5_core_dev *dev)
{
	struct mlx5_srq_table *table = &dev->priv.srq_table;

	spin_lock_init(&table->lock);
	INIT_RADIX_TREE(&table->tree, GFP_ATOMIC);
}

void mlx5_cleanup_srq_table(struct mlx5_core_dev *dev)
{
	/* nothing */
}