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 		en_err(priv, "Failed to allocate CQ structure\n");
58 		return -ENOMEM;
59 	}
60 
61 	cq->size = entries;
62 	cq->buf_size = cq->size * mdev->dev->caps.cqe_size;
63 
64 	cq->ring = ring;
65 	cq->type = mode;
66 	cq->vector = mdev->dev->caps.num_comp_vectors;
67 
68 	/* Allocate HW buffers on provided NUMA node.
69 	 * dev->numa_node is used in mtt range allocation flow.
70 	 */
71 	set_dev_node(&mdev->dev->persist->pdev->dev, node);
72 	err = mlx4_alloc_hwq_res(mdev->dev, &cq->wqres,
73 				cq->buf_size);
74 	set_dev_node(&mdev->dev->persist->pdev->dev, mdev->dev->numa_node);
75 	if (err)
76 		goto err_cq;
77 
78 	cq->buf = (struct mlx4_cqe *)cq->wqres.buf.direct.buf;
79 	*pcq = cq;
80 
81 	return 0;
82 
83 err_cq:
84 	kfree(cq);
85 	*pcq = NULL;
86 	return err;
87 }
88 
89 int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
90 			int cq_idx)
91 {
92 	struct mlx4_en_dev *mdev = priv->mdev;
93 	int irq, err = 0;
94 	int timestamp_en = 0;
95 	bool assigned_eq = false;
96 
97 	cq->dev = mdev->pndev[priv->port];
98 	cq->mcq.set_ci_db  = cq->wqres.db.db;
99 	cq->mcq.arm_db     = cq->wqres.db.db + 1;
100 	*cq->mcq.set_ci_db = 0;
101 	*cq->mcq.arm_db    = 0;
102 	memset(cq->buf, 0, cq->buf_size);
103 
104 	if (cq->type == RX) {
105 		if (!mlx4_is_eq_vector_valid(mdev->dev, priv->port,
106 					     cq->vector)) {
107 			cq->vector = cpumask_first(priv->rx_ring[cq->ring]->affinity_mask);
108 
109 			err = mlx4_assign_eq(mdev->dev, priv->port,
110 					     &cq->vector);
111 			if (err) {
112 				mlx4_err(mdev, "Failed assigning an EQ to CQ vector %d\n",
113 					 cq->vector);
114 				goto free_eq;
115 			}
116 
117 			assigned_eq = true;
118 		}
119 		irq = mlx4_eq_get_irq(mdev->dev, cq->vector);
120 		cq->aff_mask = irq_get_effective_affinity_mask(irq);
121 	} else {
122 		/* For TX we use the same irq per
123 		ring we assigned for the RX    */
124 		struct mlx4_en_cq *rx_cq;
125 
126 		cq_idx = cq_idx % priv->rx_ring_num;
127 		rx_cq = priv->rx_cq[cq_idx];
128 		cq->vector = rx_cq->vector;
129 	}
130 
131 	if (cq->type == RX)
132 		cq->size = priv->rx_ring[cq->ring]->actual_size;
133 
134 	if ((cq->type != RX && priv->hwtstamp_config.tx_type) ||
135 	    (cq->type == RX && priv->hwtstamp_config.rx_filter))
136 		timestamp_en = 1;
137 
138 	cq->mcq.usage = MLX4_RES_USAGE_DRIVER;
139 	err = mlx4_cq_alloc(mdev->dev, cq->size, &cq->wqres.mtt,
140 			    &mdev->priv_uar, cq->wqres.db.dma, &cq->mcq,
141 			    cq->vector, 0, timestamp_en, &cq->wqres.buf, false);
142 	if (err)
143 		goto free_eq;
144 
145 	cq->mcq.event = mlx4_en_cq_event;
146 
147 	switch (cq->type) {
148 	case TX:
149 		cq->mcq.comp = mlx4_en_tx_irq;
150 		netif_tx_napi_add(cq->dev, &cq->napi, mlx4_en_poll_tx_cq,
151 				  NAPI_POLL_WEIGHT);
152 		napi_enable(&cq->napi);
153 		break;
154 	case RX:
155 		cq->mcq.comp = mlx4_en_rx_irq;
156 		netif_napi_add(cq->dev, &cq->napi, mlx4_en_poll_rx_cq, 64);
157 		napi_enable(&cq->napi);
158 		break;
159 	case TX_XDP:
160 		/* nothing regarding napi, it's shared with rx ring */
161 		cq->xdp_busy = false;
162 		break;
163 	}
164 
165 	return 0;
166 
167 free_eq:
168 	if (assigned_eq)
169 		mlx4_release_eq(mdev->dev, cq->vector);
170 	cq->vector = mdev->dev->caps.num_comp_vectors;
171 	return err;
172 }
173 
174 void mlx4_en_destroy_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq **pcq)
175 {
176 	struct mlx4_en_dev *mdev = priv->mdev;
177 	struct mlx4_en_cq *cq = *pcq;
178 
179 	mlx4_free_hwq_res(mdev->dev, &cq->wqres, cq->buf_size);
180 	if (mlx4_is_eq_vector_valid(mdev->dev, priv->port, cq->vector) &&
181 	    cq->type == RX)
182 		mlx4_release_eq(priv->mdev->dev, cq->vector);
183 	cq->vector = 0;
184 	cq->buf_size = 0;
185 	cq->buf = NULL;
186 	kfree(cq);
187 	*pcq = NULL;
188 }
189 
190 void mlx4_en_deactivate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
191 {
192 	if (cq->type != TX_XDP) {
193 		napi_disable(&cq->napi);
194 		netif_napi_del(&cq->napi);
195 	}
196 
197 	mlx4_cq_free(priv->mdev->dev, &cq->mcq);
198 }
199 
200 /* Set rx cq moderation parameters */
201 int mlx4_en_set_cq_moder(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
202 {
203 	return mlx4_cq_modify(priv->mdev->dev, &cq->mcq,
204 			      cq->moder_cnt, cq->moder_time);
205 }
206 
207 void mlx4_en_arm_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
208 {
209 	mlx4_cq_arm(&cq->mcq, MLX4_CQ_DB_REQ_NOT, priv->mdev->uar_map,
210 		    &priv->mdev->uar_lock);
211 }
212 
213 
214