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>
37#include <linux/mlx5/cq.h>
38#include <linux/mlx5/qp.h>
39
40struct mlx5_wq_param {
41	int		buf_numa_node;
42	int		db_numa_node;
43};
44
45struct mlx5_wq_ctrl {
46	struct mlx5_core_dev	*mdev;
47	struct mlx5_frag_buf	buf;
48	struct mlx5_db		db;
49};
50
51struct mlx5_wq_cyc {
52	struct mlx5_frag_buf_ctrl fbc;
53	__be32			*db;
54	u16			sz;
55	u16			wqe_ctr;
56	u16			cur_sz;
57};
58
59struct mlx5_wq_qp {
60	struct mlx5_wq_cyc	rq;
61	struct mlx5_wq_cyc	sq;
62};
63
64struct mlx5_cqwq {
65	struct mlx5_frag_buf_ctrl fbc;
66	__be32			  *db;
67	u32			  cc; /* consumer counter */
68};
69
70struct mlx5_wq_ll {
71	struct mlx5_frag_buf_ctrl fbc;
72	__be32			*db;
73	__be16			*tail_next;
74	u16			head;
75	u16			wqe_ctr;
76	u16			cur_sz;
77};
78
79int mlx5_wq_cyc_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
80		       void *wqc, struct mlx5_wq_cyc *wq,
81		       struct mlx5_wq_ctrl *wq_ctrl);
82void mlx5_wq_cyc_wqe_dump(struct mlx5_wq_cyc *wq, u16 ix, u8 nstrides);
83void mlx5_wq_cyc_reset(struct mlx5_wq_cyc *wq);
84
85int mlx5_wq_qp_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
86		      void *qpc, struct mlx5_wq_qp *wq,
87		      struct mlx5_wq_ctrl *wq_ctrl);
88
89int mlx5_cqwq_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
90		     void *cqc, struct mlx5_cqwq *wq,
91		     struct mlx5_wq_ctrl *wq_ctrl);
92
93int mlx5_wq_ll_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
94		      void *wqc, struct mlx5_wq_ll *wq,
95		      struct mlx5_wq_ctrl *wq_ctrl);
96void mlx5_wq_ll_reset(struct mlx5_wq_ll *wq);
97
98void mlx5_wq_destroy(struct mlx5_wq_ctrl *wq_ctrl);
99
100static inline u32 mlx5_wq_cyc_get_size(struct mlx5_wq_cyc *wq)
101{
102	return (u32)wq->fbc.sz_m1 + 1;
103}
104
105static inline int mlx5_wq_cyc_is_full(struct mlx5_wq_cyc *wq)
106{
107	return wq->cur_sz == wq->sz;
108}
109
110static inline int mlx5_wq_cyc_missing(struct mlx5_wq_cyc *wq)
111{
112	return wq->sz - wq->cur_sz;
113}
114
115static inline int mlx5_wq_cyc_is_empty(struct mlx5_wq_cyc *wq)
116{
117	return !wq->cur_sz;
118}
119
120static inline void mlx5_wq_cyc_push(struct mlx5_wq_cyc *wq)
121{
122	wq->wqe_ctr++;
123	wq->cur_sz++;
124}
125
126static inline void mlx5_wq_cyc_push_n(struct mlx5_wq_cyc *wq, u16 n)
127{
128	wq->wqe_ctr += n;
129	wq->cur_sz += n;
130}
131
132static inline void mlx5_wq_cyc_pop(struct mlx5_wq_cyc *wq)
133{
134	wq->cur_sz--;
135}
136
137static inline void mlx5_wq_cyc_update_db_record(struct mlx5_wq_cyc *wq)
138{
139	*wq->db = cpu_to_be32(wq->wqe_ctr);
140}
141
142static inline u16 mlx5_wq_cyc_ctr2ix(struct mlx5_wq_cyc *wq, u16 ctr)
143{
144	return ctr & wq->fbc.sz_m1;
145}
146
147static inline u16 mlx5_wq_cyc_get_head(struct mlx5_wq_cyc *wq)
148{
149	return mlx5_wq_cyc_ctr2ix(wq, wq->wqe_ctr);
150}
151
152static inline u16 mlx5_wq_cyc_get_tail(struct mlx5_wq_cyc *wq)
153{
154	return mlx5_wq_cyc_ctr2ix(wq, wq->wqe_ctr - wq->cur_sz);
155}
156
157static inline void *mlx5_wq_cyc_get_wqe(struct mlx5_wq_cyc *wq, u16 ix)
158{
159	return mlx5_frag_buf_get_wqe(&wq->fbc, ix);
160}
161
162static inline u16 mlx5_wq_cyc_get_contig_wqebbs(struct mlx5_wq_cyc *wq, u16 ix)
163{
164	return mlx5_frag_buf_get_idx_last_contig_stride(&wq->fbc, ix) - ix + 1;
165}
166
167static inline int mlx5_wq_cyc_cc_bigger(u16 cc1, u16 cc2)
168{
169	int equal   = (cc1 == cc2);
170	int smaller = 0x8000 & (cc1 - cc2);
171
172	return !equal && !smaller;
173}
174
175static inline u16 mlx5_wq_cyc_get_counter(struct mlx5_wq_cyc *wq)
176{
177	return wq->wqe_ctr;
178}
179
180static inline u32 mlx5_cqwq_get_size(struct mlx5_cqwq *wq)
181{
182	return wq->fbc.sz_m1 + 1;
183}
184
185static inline u8 mlx5_cqwq_get_log_stride_size(struct mlx5_cqwq *wq)
186{
187	return wq->fbc.log_stride;
188}
189
190static inline u32 mlx5_cqwq_ctr2ix(struct mlx5_cqwq *wq, u32 ctr)
191{
192	return ctr & wq->fbc.sz_m1;
193}
194
195static inline u32 mlx5_cqwq_get_ci(struct mlx5_cqwq *wq)
196{
197	return mlx5_cqwq_ctr2ix(wq, wq->cc);
198}
199
200static inline struct mlx5_cqe64 *mlx5_cqwq_get_wqe(struct mlx5_cqwq *wq, u32 ix)
201{
202	struct mlx5_cqe64 *cqe = mlx5_frag_buf_get_wqe(&wq->fbc, ix);
203
204	/* For 128B CQEs the data is in the last 64B */
205	cqe += wq->fbc.log_stride == 7;
206
207	return cqe;
208}
209
210static inline u32 mlx5_cqwq_get_ctr_wrap_cnt(struct mlx5_cqwq *wq, u32 ctr)
211{
212	return ctr >> wq->fbc.log_sz;
213}
214
215static inline u32 mlx5_cqwq_get_wrap_cnt(struct mlx5_cqwq *wq)
216{
217	return mlx5_cqwq_get_ctr_wrap_cnt(wq, wq->cc);
218}
219
220static inline void mlx5_cqwq_pop(struct mlx5_cqwq *wq)
221{
222	wq->cc++;
223}
224
225static inline void mlx5_cqwq_update_db_record(struct mlx5_cqwq *wq)
226{
227	*wq->db = cpu_to_be32(wq->cc & 0xffffff);
228}
229
230static inline struct mlx5_cqe64 *mlx5_cqwq_get_cqe(struct mlx5_cqwq *wq)
231{
232	u32 ci = mlx5_cqwq_get_ci(wq);
233	struct mlx5_cqe64 *cqe = mlx5_cqwq_get_wqe(wq, ci);
234	u8 cqe_ownership_bit = cqe->op_own & MLX5_CQE_OWNER_MASK;
235	u8 sw_ownership_val = mlx5_cqwq_get_wrap_cnt(wq) & 1;
236
237	if (cqe_ownership_bit != sw_ownership_val)
238		return NULL;
239
240	/* ensure cqe content is read after cqe ownership bit */
241	dma_rmb();
242
243	return cqe;
244}
245
246static inline
247struct mlx5_cqe64 *mlx5_cqwq_get_cqe_enahnced_comp(struct mlx5_cqwq *wq)
248{
249	u8 sw_validity_iteration_count = mlx5_cqwq_get_wrap_cnt(wq) & 0xff;
250	u32 ci = mlx5_cqwq_get_ci(wq);
251	struct mlx5_cqe64 *cqe;
252
253	cqe = mlx5_cqwq_get_wqe(wq, ci);
254	if (cqe->validity_iteration_count != sw_validity_iteration_count)
255		return NULL;
256
257	/* ensure cqe content is read after cqe ownership bit/validity byte */
258	dma_rmb();
259
260	return cqe;
261}
262
263static inline u32 mlx5_wq_ll_get_size(struct mlx5_wq_ll *wq)
264{
265	return (u32)wq->fbc.sz_m1 + 1;
266}
267
268static inline int mlx5_wq_ll_is_full(struct mlx5_wq_ll *wq)
269{
270	return wq->cur_sz == wq->fbc.sz_m1;
271}
272
273static inline int mlx5_wq_ll_is_empty(struct mlx5_wq_ll *wq)
274{
275	return !wq->cur_sz;
276}
277
278static inline int mlx5_wq_ll_missing(struct mlx5_wq_ll *wq)
279{
280	return wq->fbc.sz_m1 - wq->cur_sz;
281}
282
283static inline void *mlx5_wq_ll_get_wqe(struct mlx5_wq_ll *wq, u16 ix)
284{
285	return mlx5_frag_buf_get_wqe(&wq->fbc, ix);
286}
287
288static inline u16 mlx5_wq_ll_get_wqe_next_ix(struct mlx5_wq_ll *wq, u16 ix)
289{
290	struct mlx5_wqe_srq_next_seg *wqe = mlx5_wq_ll_get_wqe(wq, ix);
291
292	return be16_to_cpu(wqe->next_wqe_index);
293}
294
295static inline void mlx5_wq_ll_push(struct mlx5_wq_ll *wq, u16 head_next)
296{
297	wq->head = head_next;
298	wq->wqe_ctr++;
299	wq->cur_sz++;
300}
301
302static inline void mlx5_wq_ll_pop(struct mlx5_wq_ll *wq, __be16 ix,
303				  __be16 *next_tail_next)
304{
305	*wq->tail_next = ix;
306	wq->tail_next = next_tail_next;
307	wq->cur_sz--;
308}
309
310static inline void mlx5_wq_ll_update_db_record(struct mlx5_wq_ll *wq)
311{
312	*wq->db = cpu_to_be32(wq->wqe_ctr);
313}
314
315static inline u16 mlx5_wq_ll_get_head(struct mlx5_wq_ll *wq)
316{
317	return wq->head;
318}
319
320static inline u16 mlx5_wq_ll_get_counter(struct mlx5_wq_ll *wq)
321{
322	return wq->wqe_ctr;
323}
324
325#endif /* __MLX5_WQ_H__ */
326