[linux-2.6-block.git] / drivers / net / ethernet / mellanox / mlx5 / core / wq.h

/*
 * 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.
 */

#ifndef __MLX5_WQ_H__
#define __MLX5_WQ_H__

#include <linux/mlx5/mlx5_ifc.h>
#include <linux/mlx5/cq.h>
#include <linux/mlx5/qp.h>

struct mlx5_wq_param {
	int		linear;
	int		buf_numa_node;
	int		db_numa_node;
};

struct mlx5_wq_ctrl {
	struct mlx5_core_dev	*mdev;
	struct mlx5_frag_buf	buf;
	struct mlx5_db		db;
};

struct mlx5_frag_wq_ctrl {
	struct mlx5_core_dev	*mdev;
	struct mlx5_frag_buf	frag_buf;
	struct mlx5_db		db;
};

struct mlx5_wq_cyc {
	void			*buf;
	__be32			*db;
	u16			sz_m1;
	u8			log_stride;
};

struct mlx5_wq_qp {
	struct mlx5_wq_cyc	rq;
	struct mlx5_wq_cyc	sq;
};

struct mlx5_cqwq {
	struct mlx5_frag_buf_ctrl fbc;
	__be32			  *db;
	u32			  cc; /* consumer counter */
};

struct mlx5_wq_ll {
	void			*buf;
	__be32			*db;
	__be16			*tail_next;
	u16			sz_m1;
	u16			head;
	u16			wqe_ctr;
	u16			cur_sz;
	u8			log_stride;
};

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);
u32 mlx5_wq_cyc_get_size(struct mlx5_wq_cyc *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);

int mlx5_cqwq_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
		     void *cqc, struct mlx5_cqwq *wq,
		     struct mlx5_frag_wq_ctrl *wq_ctrl);
u32 mlx5_cqwq_get_size(struct mlx5_cqwq *wq);

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);
u32 mlx5_wq_ll_get_size(struct mlx5_wq_ll *wq);

void mlx5_wq_destroy(struct mlx5_wq_ctrl *wq_ctrl);
void mlx5_cqwq_destroy(struct mlx5_frag_wq_ctrl *wq_ctrl);

static inline u16 mlx5_wq_cyc_ctr2ix(struct mlx5_wq_cyc *wq, u16 ctr)
{
	return ctr & wq->sz_m1;
}

static inline void *mlx5_wq_cyc_get_wqe(struct mlx5_wq_cyc *wq, u16 ix)
{
	return wq->buf + (ix << wq->log_stride);
}

static inline int mlx5_wq_cyc_cc_bigger(u16 cc1, u16 cc2)
{
	int equal   = (cc1 == cc2);
	int smaller = 0x8000 & (cc1 - cc2);

	return !equal && !smaller;
}

static inline u32 mlx5_cqwq_get_ci(struct mlx5_cqwq *wq)
{
	return wq->cc & wq->fbc.sz_m1;
}

static inline void *mlx5_cqwq_get_wqe(struct mlx5_cqwq *wq, u32 ix)
{
	return mlx5_frag_buf_get_wqe(&wq->fbc, ix);
}

static inline u32 mlx5_cqwq_get_wrap_cnt(struct mlx5_cqwq *wq)
{
	return wq->cc >> wq->fbc.log_sz;
}

static inline void mlx5_cqwq_pop(struct mlx5_cqwq *wq)
{
	wq->cc++;
}

static inline void mlx5_cqwq_update_db_record(struct mlx5_cqwq *wq)
{
	*wq->db = cpu_to_be32(wq->cc & 0xffffff);
}

static inline struct mlx5_cqe64 *mlx5_cqwq_get_cqe(struct mlx5_cqwq *wq)
{
	u32 ci = mlx5_cqwq_get_ci(wq);
	struct mlx5_cqe64 *cqe = mlx5_cqwq_get_wqe(wq, ci);
	u8 cqe_ownership_bit = cqe->op_own & MLX5_CQE_OWNER_MASK;
	u8 sw_ownership_val = mlx5_cqwq_get_wrap_cnt(wq) & 1;

	if (cqe_ownership_bit != sw_ownership_val)
		return NULL;

	/* ensure cqe content is read after cqe ownership bit */
	dma_rmb();

	return cqe;
}

static inline int mlx5_wq_ll_is_full(struct mlx5_wq_ll *wq)
{
	return wq->cur_sz == wq->sz_m1;
}

static inline int mlx5_wq_ll_is_empty(struct mlx5_wq_ll *wq)
{
	return !wq->cur_sz;
}

static inline void *mlx5_wq_ll_get_wqe(struct mlx5_wq_ll *wq, u16 ix)
{
	return wq->buf + (ix << wq->log_stride);
}

static inline void mlx5_wq_ll_push(struct mlx5_wq_ll *wq, u16 head_next)
{
	wq->head = head_next;
	wq->wqe_ctr++;
	wq->cur_sz++;
}

static inline void mlx5_wq_ll_pop(struct mlx5_wq_ll *wq, __be16 ix,
				  __be16 *next_tail_next)
{
	*wq->tail_next = ix;
	wq->tail_next = next_tail_next;
	wq->cur_sz--;
}

static inline void mlx5_wq_ll_update_db_record(struct mlx5_wq_ll *wq)
{
	*wq->db = cpu_to_be32(wq->wqe_ctr);
}

#endif /* __MLX5_WQ_H__ */
Commit	Line	Data
e586b3b0 AV	1	/*
	2	* Copyright (c) 2013-2015, Mellanox Technologies, Ltd. All rights reserved.
	3	*
	4	* This software is available to you under a choice of one of two
	5	* licenses. You may choose to be licensed under the terms of the GNU
	6	* General Public License (GPL) Version 2, available from the file
	7	* COPYING in the main directory of this source tree, or the
	8	* OpenIB.org BSD license below:
	9	*
	10	* Redistribution and use in source and binary forms, with or
	11	* without modification, are permitted provided that the following
	12	* conditions are met:
	13	*
	14	* - Redistributions of source code must retain the above
	15	* copyright notice, this list of conditions and the following
	16	* disclaimer.
	17	*
	18	* - Redistributions in binary form must reproduce the above
	19	* copyright notice, this list of conditions and the following
	20	* disclaimer in the documentation and/or other materials
	21	* provided with the distribution.
	22	*
	23	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	24	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	25	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	26	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	27	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	28	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	29	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	30	* SOFTWARE.
	31	*/
	32
	33	#ifndef __MLX5_WQ_H__
	34	#define __MLX5_WQ_H__
	35
	36	#include <linux/mlx5/mlx5_ifc.h>
4b673793	37	#include <linux/mlx5/cq.h>
3f2b7edd	38	#include <linux/mlx5/qp.h>
e586b3b0 AV	39
	40	struct mlx5_wq_param {
	41	int linear;
311c7c71 SM	42	int buf_numa_node;
311c7c71 SM	43	int db_numa_node;
e586b3b0 AV	44	};
	45
	46	struct mlx5_wq_ctrl {
	47	struct mlx5_core_dev *mdev;
388ca8be	48	struct mlx5_frag_buf buf;
e586b3b0 AV	49	struct mlx5_db db;
	50	};
	51
1c1b5228 TT	52	struct mlx5_frag_wq_ctrl {
	53	struct mlx5_core_dev *mdev;
	54	struct mlx5_frag_buf frag_buf;
	55	struct mlx5_db db;
	56	};
	57
e586b3b0 AV	58	struct mlx5_wq_cyc {
	59	void *buf;
	60	__be32 *db;
	61	u16 sz_m1;
	62	u8 log_stride;
	63	};
	64
3f2b7edd IT	65	struct mlx5_wq_qp {
	66	struct mlx5_wq_cyc rq;
	67	struct mlx5_wq_cyc sq;
	68	};
	69
e586b3b0	70	struct mlx5_cqwq {
388ca8be YC	71	struct mlx5_frag_buf_ctrl fbc;
	72	__be32 *db;
	73	u32 cc; /* consumer counter */
e586b3b0 AV	74	};
	75
	76	struct mlx5_wq_ll {
	77	void *buf;
	78	__be32 *db;
	79	__be16 *tail_next;
	80	u16 sz_m1;
	81	u16 head;
	82	u16 wqe_ctr;
	83	u16 cur_sz;
	84	u8 log_stride;
	85	};
	86
	87	int mlx5_wq_cyc_create(struct mlx5_core_dev mdev, struct mlx5_wq_param param,
	88	void wqc, struct mlx5_wq_cyc wq,
	89	struct mlx5_wq_ctrl *wq_ctrl);
	90	u32 mlx5_wq_cyc_get_size(struct mlx5_wq_cyc *wq);
	91
3f2b7edd IT	92	int mlx5_wq_qp_create(struct mlx5_core_dev mdev, struct mlx5_wq_param param,
	93	void qpc, struct mlx5_wq_qp wq,
	94	struct mlx5_wq_ctrl *wq_ctrl);
	95
e586b3b0 AV	96	int mlx5_cqwq_create(struct mlx5_core_dev mdev, struct mlx5_wq_param param,
e586b3b0 AV	97	void cqc, struct mlx5_cqwq wq,
1c1b5228	98	struct mlx5_frag_wq_ctrl *wq_ctrl);
e586b3b0 AV	99	u32 mlx5_cqwq_get_size(struct mlx5_cqwq *wq);
	100
	101	int mlx5_wq_ll_create(struct mlx5_core_dev mdev, struct mlx5_wq_param param,
	102	void wqc, struct mlx5_wq_ll wq,
	103	struct mlx5_wq_ctrl *wq_ctrl);
	104	u32 mlx5_wq_ll_get_size(struct mlx5_wq_ll *wq);
	105
	106	void mlx5_wq_destroy(struct mlx5_wq_ctrl *wq_ctrl);
1c1b5228	107	void mlx5_cqwq_destroy(struct mlx5_frag_wq_ctrl *wq_ctrl);
e586b3b0 AV	108
	109	static inline u16 mlx5_wq_cyc_ctr2ix(struct mlx5_wq_cyc *wq, u16 ctr)
	110	{
	111	return ctr & wq->sz_m1;
	112	}
	113
	114	static inline void mlx5_wq_cyc_get_wqe(struct mlx5_wq_cyc wq, u16 ix)
	115	{
	116	return wq->buf + (ix << wq->log_stride);
	117	}
	118
	119	static inline int mlx5_wq_cyc_cc_bigger(u16 cc1, u16 cc2)
	120	{
	121	int equal = (cc1 == cc2);
	122	int smaller = 0x8000 & (cc1 - cc2);
	123
	124	return !equal && !smaller;
	125	}
	126
	127	static inline u32 mlx5_cqwq_get_ci(struct mlx5_cqwq *wq)
	128	{
388ca8be	129	return wq->cc & wq->fbc.sz_m1;
e586b3b0 AV	130	}
	131
	132	static inline void mlx5_cqwq_get_wqe(struct mlx5_cqwq wq, u32 ix)
	133	{
388ca8be	134	return mlx5_frag_buf_get_wqe(&wq->fbc, ix);
e586b3b0 AV	135	}
	136
	137	static inline u32 mlx5_cqwq_get_wrap_cnt(struct mlx5_cqwq *wq)
	138	{
388ca8be	139	return wq->cc >> wq->fbc.log_sz;
e586b3b0 AV	140	}
	141
	142	static inline void mlx5_cqwq_pop(struct mlx5_cqwq *wq)
	143	{
	144	wq->cc++;
	145	}
	146
	147	static inline void mlx5_cqwq_update_db_record(struct mlx5_cqwq *wq)
	148	{
	149	*wq->db = cpu_to_be32(wq->cc & 0xffffff);
	150	}
	151
4b673793 IT	152	static inline struct mlx5_cqe64 mlx5_cqwq_get_cqe(struct mlx5_cqwq wq)
	153	{
	154	u32 ci = mlx5_cqwq_get_ci(wq);
	155	struct mlx5_cqe64 *cqe = mlx5_cqwq_get_wqe(wq, ci);
	156	u8 cqe_ownership_bit = cqe->op_own & MLX5_CQE_OWNER_MASK;
	157	u8 sw_ownership_val = mlx5_cqwq_get_wrap_cnt(wq) & 1;
	158
	159	if (cqe_ownership_bit != sw_ownership_val)
	160	return NULL;
	161
	162	/* ensure cqe content is read after cqe ownership bit */
	163	dma_rmb();
	164
	165	return cqe;
	166	}
	167
e586b3b0 AV	168	static inline int mlx5_wq_ll_is_full(struct mlx5_wq_ll *wq)
	169	{
	170	return wq->cur_sz == wq->sz_m1;
	171	}
	172
	173	static inline int mlx5_wq_ll_is_empty(struct mlx5_wq_ll *wq)
	174	{
	175	return !wq->cur_sz;
	176	}
	177
	178	static inline void mlx5_wq_ll_get_wqe(struct mlx5_wq_ll wq, u16 ix)
	179	{
	180	return wq->buf + (ix << wq->log_stride);
	181	}
	182
	183	static inline void mlx5_wq_ll_push(struct mlx5_wq_ll *wq, u16 head_next)
	184	{
	185	wq->head = head_next;
	186	wq->wqe_ctr++;
	187	wq->cur_sz++;
	188	}
	189
	190	static inline void mlx5_wq_ll_pop(struct mlx5_wq_ll *wq, __be16 ix,
	191	__be16 *next_tail_next)
	192	{
	193	*wq->tail_next = ix;
	194	wq->tail_next = next_tail_next;
	195	wq->cur_sz--;
	196	}
	197
	198	static inline void mlx5_wq_ll_update_db_record(struct mlx5_wq_ll *wq)
	199	{
	200	*wq->db = cpu_to_be32(wq->wqe_ctr);
	201	}
	202
	203	#endif /* __MLX5_WQ_H__ */