1 /*
2  * Copyright (c) 2007 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/mlx4/cq.h>
35 #include <linux/mlx4/qp.h>
36 #include <linux/mlx4/cmd.h>
37 
38 #include "mlx4_en.h"
39 
40 static void mlx4_en_cq_event(struct mlx4_cq *cq, enum mlx4_event event)
41 {
42 	return;
43 }
44 
45 
46 int mlx4_en_create_cq(struct mlx4_en_priv *priv,
47 		      struct mlx4_en_cq **pcq,
48 		      int entries, int ring, enum cq_type mode,
49 		      int node)
50 {
51 	struct mlx4_en_dev *mdev = priv->mdev;
52 	struct mlx4_en_cq *cq;
53 	int err;
54 
55 	cq = kzalloc_node(sizeof(*cq), GFP_KERNEL, node);
56 	if (!cq) {
57 		cq = kzalloc(sizeof(*cq), GFP_KERNEL);
58 		if (!cq) {
59 			en_err(priv, "Failed to allocate CQ structure\n");
60 			return -ENOMEM;
61 		}
62 	}
63 
64 	cq->size = entries;
65 	cq->buf_size = cq->size * mdev->dev->caps.cqe_size;
66 
67 	cq->ring = ring;
68 	cq->type = mode;
69 	cq->vector = mdev->dev->caps.num_comp_vectors;
70 
71 	/* Allocate HW buffers on provided NUMA node.
72 	 * dev->numa_node is used in mtt range allocation flow.
73 	 */
74 	set_dev_node(&mdev->dev->persist->pdev->dev, node);
75 	err = mlx4_alloc_hwq_res(mdev->dev, &cq->wqres,
76 				cq->buf_size);
77 	set_dev_node(&mdev->dev->persist->pdev->dev, mdev->dev->numa_node);
78 	if (err)
79 		goto err_cq;
80 
81 	cq->buf = (struct mlx4_cqe *)cq->wqres.buf.direct.buf;
82 	*pcq = cq;
83 
84 	return 0;
85 
86 err_cq:
87 	kfree(cq);
88 	*pcq = NULL;
89 	return err;
90 }
91 
92 int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
93 			int cq_idx)
94 {
95 	struct mlx4_en_dev *mdev = priv->mdev;
96 	int err = 0;
97 	int timestamp_en = 0;
98 	bool assigned_eq = false;
99 
100 	cq->dev = mdev->pndev[priv->port];
101 	cq->mcq.set_ci_db  = cq->wqres.db.db;
102 	cq->mcq.arm_db     = cq->wqres.db.db + 1;
103 	*cq->mcq.set_ci_db = 0;
104 	*cq->mcq.arm_db    = 0;
105 	memset(cq->buf, 0, cq->buf_size);
106 
107 	if (cq->type == RX) {
108 		if (!mlx4_is_eq_vector_valid(mdev->dev, priv->port,
109 					     cq->vector)) {
110 			cq->vector = cpumask_first(priv->rx_ring[cq->ring]->affinity_mask);
111 
112 			err = mlx4_assign_eq(mdev->dev, priv->port,
113 					     &cq->vector);
114 			if (err) {
115 				mlx4_err(mdev, "Failed assigning an EQ to CQ vector %d\n",
116 					 cq->vector);
117 				goto free_eq;
118 			}
119 
120 			assigned_eq = true;
121 		}
122 
123 		cq->irq_desc =
124 			irq_to_desc(mlx4_eq_get_irq(mdev->dev,
125 						    cq->vector));
126 	} else {
127 		/* For TX we use the same irq per
128 		ring we assigned for the RX    */
129 		struct mlx4_en_cq *rx_cq;
130 
131 		cq_idx = cq_idx % priv->rx_ring_num;
132 		rx_cq = priv->rx_cq[cq_idx];
133 		cq->vector = rx_cq->vector;
134 	}
135 
136 	if (cq->type == RX)
137 		cq->size = priv->rx_ring[cq->ring]->actual_size;
138 
139 	if ((cq->type != RX && priv->hwtstamp_config.tx_type) ||
140 	    (cq->type == RX && priv->hwtstamp_config.rx_filter))
141 		timestamp_en = 1;
142 
143 	err = mlx4_cq_alloc(mdev->dev, cq->size, &cq->wqres.mtt,
144 			    &mdev->priv_uar, cq->wqres.db.dma, &cq->mcq,
145 			    cq->vector, 0, timestamp_en);
146 	if (err)
147 		goto free_eq;
148 
149 	cq->mcq.event = mlx4_en_cq_event;
150 
151 	switch (cq->type) {
152 	case TX:
153 		cq->mcq.comp = mlx4_en_tx_irq;
154 		netif_tx_napi_add(cq->dev, &cq->napi, mlx4_en_poll_tx_cq,
155 				  NAPI_POLL_WEIGHT);
156 		napi_enable(&cq->napi);
157 		break;
158 	case RX:
159 		cq->mcq.comp = mlx4_en_rx_irq;
160 		netif_napi_add(cq->dev, &cq->napi, mlx4_en_poll_rx_cq, 64);
161 		napi_enable(&cq->napi);
162 		break;
163 	case TX_XDP:
164 		/* nothing regarding napi, it's shared with rx ring */
165 		cq->xdp_busy = false;
166 		break;
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 	mlx4_free_hwq_res(mdev->dev, &cq->wqres, cq->buf_size);
184 	if (mlx4_is_eq_vector_valid(mdev->dev, priv->port, cq->vector) &&
185 	    cq->type == RX)
186 		mlx4_release_eq(priv->mdev->dev, cq->vector);
187 	cq->vector = 0;
188 	cq->buf_size = 0;
189 	cq->buf = NULL;
190 	kfree(cq);
191 	*pcq = NULL;
192 }
193 
194 void mlx4_en_deactivate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
195 {
196 	if (cq->type != TX_XDP) {
197 		napi_disable(&cq->napi);
198 		netif_napi_del(&cq->napi);
199 	}
200 
201 	mlx4_cq_free(priv->mdev->dev, &cq->mcq);
202 }
203 
204 /* Set rx cq moderation parameters */
205 int mlx4_en_set_cq_moder(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
206 {
207 	return mlx4_cq_modify(priv->mdev->dev, &cq->mcq,
208 			      cq->moder_cnt, cq->moder_time);
209 }
210 
211 int mlx4_en_arm_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
212 {
213 	mlx4_cq_arm(&cq->mcq, MLX4_CQ_DB_REQ_NOT, priv->mdev->uar_map,
214 		    &priv->mdev->uar_lock);
215 
216 	return 0;
217 }
218 
219 
220