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