xref: /freebsd/sys/dev/mlx4/mlx4_en/mlx4_en_cq.c (revision 8a0a413e)
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 
42 static void mlx4_en_cq_event(struct mlx4_cq *cq, enum mlx4_event event)
43 {
44 	return;
45 }
46 
47 
48 int mlx4_en_create_cq(struct mlx4_en_priv *priv,
49 		      struct mlx4_en_cq **pcq,
50 		      int entries, int ring, enum cq_type mode,
51 		      int node)
52 {
53 	struct mlx4_en_dev *mdev = priv->mdev;
54 	struct mlx4_en_cq *cq;
55 	int err;
56 
57 	cq = kzalloc_node(sizeof(*cq), GFP_KERNEL, node);
58 	if (!cq) {
59 		cq = kzalloc(sizeof(*cq), GFP_KERNEL);
60 		if (!cq) {
61 			en_err(priv, "Failed to allocate CQ structure\n");
62 			return -ENOMEM;
63 		}
64 	}
65 
66 	cq->size = entries;
67 	cq->buf_size = cq->size * mdev->dev->caps.cqe_size;
68 
69 	cq->tq = taskqueue_create_fast("mlx4_en_que", M_NOWAIT,
70                         taskqueue_thread_enqueue, &cq->tq);
71         if (mode == RX) {
72 		TASK_INIT(&cq->cq_task, 0, mlx4_en_rx_que, cq);
73 		taskqueue_start_threads(&cq->tq, 1, PI_NET, "%s rx cq",
74 				if_name(priv->dev));
75 
76 	} else {
77 		TASK_INIT(&cq->cq_task, 0, mlx4_en_tx_que, cq);
78 		taskqueue_start_threads(&cq->tq, 1, PI_NET, "%s tx cq",
79 				if_name(priv->dev));
80 	}
81 
82 	cq->ring = ring;
83 	cq->is_tx = mode;
84 	cq->vector = mdev->dev->caps.num_comp_vectors;
85 	spin_lock_init(&cq->lock);
86 
87 	err = mlx4_alloc_hwq_res(mdev->dev, &cq->wqres,
88 				cq->buf_size, 2 * PAGE_SIZE);
89 	if (err)
90 		goto err_cq;
91 
92 	err = mlx4_en_map_buffer(&cq->wqres.buf);
93 	if (err)
94 		goto err_res;
95 
96 	cq->buf = (struct mlx4_cqe *)cq->wqres.buf.direct.buf;
97 	*pcq = cq;
98 
99 	return 0;
100 
101 err_res:
102 	mlx4_free_hwq_res(mdev->dev, &cq->wqres, cq->buf_size);
103 err_cq:
104 	kfree(cq);
105 	*pcq = NULL;
106 	return err;
107 }
108 
109 int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
110 			int cq_idx)
111 {
112 	struct mlx4_en_dev *mdev = priv->mdev;
113 	int err = 0;
114 	int timestamp_en = 0;
115 	bool assigned_eq = false;
116 
117 	cq->dev = mdev->pndev[priv->port];
118 	cq->mcq.set_ci_db  = cq->wqres.db.db;
119 	cq->mcq.arm_db     = cq->wqres.db.db + 1;
120 	*cq->mcq.set_ci_db = 0;
121 	*cq->mcq.arm_db    = 0;
122 	memset(cq->buf, 0, cq->buf_size);
123 
124 	if (cq->is_tx == RX) {
125 		if (!mlx4_is_eq_vector_valid(mdev->dev, priv->port,
126 					     cq->vector)) {
127 			cq->vector = cq_idx % mdev->dev->caps.num_comp_vectors;
128 
129 			err = mlx4_assign_eq(mdev->dev, priv->port,
130 					     &cq->vector);
131 			if (err) {
132 				mlx4_err(mdev, "Failed assigning an EQ to CQ vector %d\n",
133 					 cq->vector);
134 				goto free_eq;
135 			}
136 
137 			assigned_eq = true;
138 		}
139 	} else {
140 		struct mlx4_en_cq *rx_cq;
141 		/*
142 		 * For TX we use the same irq per
143 		 * ring we assigned for the RX
144 		 */
145 		cq_idx = cq_idx % priv->rx_ring_num;
146 		rx_cq = priv->rx_cq[cq_idx];
147 		cq->vector = rx_cq->vector;
148 	}
149 
150 	if (!cq->is_tx)
151 		cq->size = priv->rx_ring[cq->ring]->actual_size;
152 
153 	err = mlx4_cq_alloc(mdev->dev, cq->size, &cq->wqres.mtt,
154 			    &mdev->priv_uar, cq->wqres.db.dma, &cq->mcq,
155 			    cq->vector, 0, timestamp_en);
156 	if (err)
157 		goto free_eq;
158 
159 	cq->mcq.comp  = cq->is_tx ? mlx4_en_tx_irq : mlx4_en_rx_irq;
160 	cq->mcq.event = mlx4_en_cq_event;
161 
162         if (cq->is_tx) {
163                 init_timer(&cq->timer);
164                 cq->timer.function = mlx4_en_poll_tx_cq;
165                 cq->timer.data = (unsigned long) cq;
166         }
167 
168 
169 	return 0;
170 
171 free_eq:
172 	if (assigned_eq)
173 		mlx4_release_eq(mdev->dev, cq->vector);
174 	cq->vector = mdev->dev->caps.num_comp_vectors;
175 	return err;
176 }
177 
178 void mlx4_en_destroy_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq **pcq)
179 {
180 	struct mlx4_en_dev *mdev = priv->mdev;
181 	struct mlx4_en_cq *cq = *pcq;
182 
183 	taskqueue_drain(cq->tq, &cq->cq_task);
184 	taskqueue_free(cq->tq);
185 	mlx4_en_unmap_buffer(&cq->wqres.buf);
186 	mlx4_free_hwq_res(mdev->dev, &cq->wqres, cq->buf_size);
187 	if (mlx4_is_eq_vector_valid(mdev->dev, priv->port, cq->vector) &&
188 	    cq->is_tx == RX)
189 		mlx4_release_eq(priv->mdev->dev, cq->vector);
190 	cq->vector = 0;
191 	cq->buf_size = 0;
192 	cq->buf = NULL;
193 	kfree(cq);
194 	*pcq = NULL;
195 }
196 
197 void mlx4_en_deactivate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
198 {
199 	taskqueue_drain(cq->tq, &cq->cq_task);
200 	if (!cq->is_tx) {
201 		synchronize_rcu();
202 	} else {
203 		del_timer_sync(&cq->timer);
204 	}
205 
206 	mlx4_cq_free(priv->mdev->dev, &cq->mcq);
207 }
208 
209 /* Set rx cq moderation parameters */
210 int mlx4_en_set_cq_moder(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
211 {
212 	return mlx4_cq_modify(priv->mdev->dev, &cq->mcq,
213 			      cq->moder_cnt, cq->moder_time);
214 }
215 
216 int mlx4_en_arm_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
217 {
218 	mlx4_cq_arm(&cq->mcq, MLX4_CQ_DB_REQ_NOT, priv->mdev->uar_map,
219 		    &priv->mdev->uar_lock);
220 
221 	return 0;
222 }
223 
224 
225