1/*
2 * Copyright (c) 2007, 2014 Mellanox Technologies. 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
34#include <linux/rcupdate.h>
35
36#include <dev/mlx4/cq.h>
37#include <dev/mlx4/qp.h>
38#include <dev/mlx4/cmd.h>
39
40#include "en.h"
41
42static void mlx4_en_cq_event(struct mlx4_cq *cq, enum mlx4_event event)
43{
44	return;
45}
46
47static void mlx4_en_tx_que(void *arg, int pending)
48{
49
50}
51
52int mlx4_en_create_cq(struct mlx4_en_priv *priv,
53		      struct mlx4_en_cq **pcq,
54		      int entries, int ring, enum cq_type mode,
55		      int node)
56{
57	struct mlx4_en_dev *mdev = priv->mdev;
58	struct mlx4_en_cq *cq;
59	int err;
60
61	cq = kzalloc_node(sizeof(*cq), GFP_KERNEL, node);
62	if (!cq) {
63		cq = kzalloc(sizeof(*cq), GFP_KERNEL);
64		if (!cq) {
65			en_err(priv, "Failed to allocate CQ structure\n");
66			return -ENOMEM;
67		}
68	}
69
70	cq->size = entries;
71	cq->buf_size = cq->size * mdev->dev->caps.cqe_size;
72
73	cq->tq = taskqueue_create_fast("mlx4_en_que", M_NOWAIT,
74                        taskqueue_thread_enqueue, &cq->tq);
75        if (mode == RX) {
76		TASK_INIT(&cq->cq_task, 0, mlx4_en_rx_que, cq);
77		taskqueue_start_threads(&cq->tq, 1, PI_NET, "%s rx cq",
78				if_name(priv->dev));
79
80	} else {
81		TASK_INIT(&cq->cq_task, 0, mlx4_en_tx_que, cq);
82		taskqueue_start_threads(&cq->tq, 1, PI_NET, "%s tx cq",
83				if_name(priv->dev));
84	}
85
86	cq->ring = ring;
87	cq->is_tx = mode;
88	cq->vector = mdev->dev->caps.num_comp_vectors;
89	spin_lock_init(&cq->lock);
90
91	err = mlx4_alloc_hwq_res(mdev->dev, &cq->wqres,
92				cq->buf_size, 2 * PAGE_SIZE);
93	if (err)
94		goto err_cq;
95
96	err = mlx4_en_map_buffer(&cq->wqres.buf);
97	if (err)
98		goto err_res;
99
100	cq->buf = (struct mlx4_cqe *)cq->wqres.buf.direct.buf;
101	*pcq = cq;
102
103	return 0;
104
105err_res:
106	mlx4_free_hwq_res(mdev->dev, &cq->wqres, cq->buf_size);
107err_cq:
108	kfree(cq);
109	*pcq = NULL;
110	return err;
111}
112
113int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
114			int cq_idx)
115{
116	struct mlx4_en_dev *mdev = priv->mdev;
117	int err = 0;
118	int timestamp_en = 0;
119	bool assigned_eq = false;
120
121	cq->dev = mdev->pndev[priv->port];
122	cq->mcq.set_ci_db  = cq->wqres.db.db;
123	cq->mcq.arm_db     = cq->wqres.db.db + 1;
124	*cq->mcq.set_ci_db = 0;
125	*cq->mcq.arm_db    = 0;
126	memset(cq->buf, 0, cq->buf_size);
127
128	if (cq->is_tx == RX) {
129		if (!mlx4_is_eq_vector_valid(mdev->dev, priv->port,
130					     cq->vector)) {
131			cq->vector = cq_idx % mdev->dev->caps.num_comp_vectors;
132
133			err = mlx4_assign_eq(mdev->dev, priv->port,
134					     &cq->vector);
135			if (err) {
136				mlx4_err(mdev, "Failed assigning an EQ to CQ vector %d\n",
137					 cq->vector);
138				goto free_eq;
139			}
140
141			assigned_eq = true;
142		}
143	} else {
144		struct mlx4_en_cq *rx_cq;
145		/*
146		 * For TX we use the same irq per
147		 * ring we assigned for the RX
148		 */
149		cq_idx = cq_idx % priv->rx_ring_num;
150		rx_cq = priv->rx_cq[cq_idx];
151		cq->vector = rx_cq->vector;
152	}
153
154	if (!cq->is_tx)
155		cq->size = priv->rx_ring[cq->ring]->actual_size;
156
157	err = mlx4_cq_alloc(mdev->dev, cq->size, &cq->wqres.mtt,
158			    &mdev->priv_uar, cq->wqres.db.dma, &cq->mcq,
159			    cq->vector, 0, timestamp_en);
160	if (err)
161		goto free_eq;
162
163	cq->mcq.comp  = cq->is_tx ? mlx4_en_tx_irq : mlx4_en_rx_irq;
164	cq->mcq.event = mlx4_en_cq_event;
165
166        if (cq->is_tx) {
167                init_timer(&cq->timer);
168                cq->timer.function = mlx4_en_poll_tx_cq;
169                cq->timer.data = (unsigned long) cq;
170        }
171
172
173	return 0;
174
175free_eq:
176	if (assigned_eq)
177		mlx4_release_eq(mdev->dev, cq->vector);
178	cq->vector = mdev->dev->caps.num_comp_vectors;
179	return err;
180}
181
182void mlx4_en_destroy_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq **pcq)
183{
184	struct mlx4_en_dev *mdev = priv->mdev;
185	struct mlx4_en_cq *cq = *pcq;
186
187	taskqueue_drain(cq->tq, &cq->cq_task);
188	taskqueue_free(cq->tq);
189	mlx4_en_unmap_buffer(&cq->wqres.buf);
190	mlx4_free_hwq_res(mdev->dev, &cq->wqres, cq->buf_size);
191	if (mlx4_is_eq_vector_valid(mdev->dev, priv->port, cq->vector) &&
192	    cq->is_tx == RX)
193		mlx4_release_eq(priv->mdev->dev, cq->vector);
194	cq->vector = 0;
195	cq->buf_size = 0;
196	cq->buf = NULL;
197	kfree(cq);
198	*pcq = NULL;
199}
200
201void mlx4_en_deactivate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
202{
203	taskqueue_drain(cq->tq, &cq->cq_task);
204	if (!cq->is_tx) {
205		synchronize_rcu();
206	} else {
207		del_timer_sync(&cq->timer);
208	}
209
210	mlx4_cq_free(priv->mdev->dev, &cq->mcq);
211}
212
213/* Set rx cq moderation parameters */
214int mlx4_en_set_cq_moder(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
215{
216	return mlx4_cq_modify(priv->mdev->dev, &cq->mcq,
217			      cq->moder_cnt, cq->moder_time);
218}
219
220int mlx4_en_arm_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
221{
222	mlx4_cq_arm(&cq->mcq, MLX4_CQ_DB_REQ_NOT, priv->mdev->uar_map,
223		    &priv->mdev->uar_lock);
224
225	return 0;
226}
227
228
229