1 /* 2 * Copyright (c) 2007 Cisco Systems, Inc. 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 #include <linux/mlx4/qp.h> 34 #include <linux/mlx4/srq.h> 35 36 #include "mlx4_ib.h" 37 #include "user.h" 38 39 static void *get_wqe(struct mlx4_ib_srq *srq, int n) 40 { 41 int offset = n << srq->msrq.wqe_shift; 42 43 if (srq->buf.nbufs == 1) 44 return srq->buf.u.direct.buf + offset; 45 else 46 return srq->buf.u.page_list[offset >> PAGE_SHIFT].buf + 47 (offset & (PAGE_SIZE - 1)); 48 } 49 50 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type) 51 { 52 struct ib_event event; 53 struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq; 54 55 if (ibsrq->event_handler) { 56 event.device = ibsrq->device; 57 event.element.srq = ibsrq; 58 switch (type) { 59 case MLX4_EVENT_TYPE_SRQ_LIMIT: 60 event.event = IB_EVENT_SRQ_LIMIT_REACHED; 61 break; 62 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR: 63 event.event = IB_EVENT_SRQ_ERR; 64 break; 65 default: 66 printk(KERN_WARNING "mlx4_ib: Unexpected event type %d " 67 "on SRQ %06x\n", type, srq->srqn); 68 return; 69 } 70 71 ibsrq->event_handler(&event, ibsrq->srq_context); 72 } 73 } 74 75 struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd, 76 struct ib_srq_init_attr *init_attr, 77 struct ib_udata *udata) 78 { 79 struct mlx4_ib_dev *dev = to_mdev(pd->device); 80 struct mlx4_ib_srq *srq; 81 struct mlx4_wqe_srq_next_seg *next; 82 int desc_size; 83 int buf_size; 84 int err; 85 int i; 86 87 /* Sanity check SRQ size before proceeding */ 88 if (init_attr->attr.max_wr >= dev->dev->caps.max_srq_wqes || 89 init_attr->attr.max_sge > dev->dev->caps.max_srq_sge) 90 return ERR_PTR(-EINVAL); 91 92 srq = kmalloc(sizeof *srq, GFP_KERNEL); 93 if (!srq) 94 return ERR_PTR(-ENOMEM); 95 96 mutex_init(&srq->mutex); 97 spin_lock_init(&srq->lock); 98 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1); 99 srq->msrq.max_gs = init_attr->attr.max_sge; 100 101 desc_size = max(32UL, 102 roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) + 103 srq->msrq.max_gs * 104 sizeof (struct mlx4_wqe_data_seg))); 105 srq->msrq.wqe_shift = ilog2(desc_size); 106 107 buf_size = srq->msrq.max * desc_size; 108 109 if (pd->uobject) { 110 struct mlx4_ib_create_srq ucmd; 111 112 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) { 113 err = -EFAULT; 114 goto err_srq; 115 } 116 117 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, 118 buf_size, 0); 119 if (IS_ERR(srq->umem)) { 120 err = PTR_ERR(srq->umem); 121 goto err_srq; 122 } 123 124 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem), 125 ilog2(srq->umem->page_size), &srq->mtt); 126 if (err) 127 goto err_buf; 128 129 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem); 130 if (err) 131 goto err_mtt; 132 133 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context), 134 ucmd.db_addr, &srq->db); 135 if (err) 136 goto err_mtt; 137 } else { 138 err = mlx4_ib_db_alloc(dev, &srq->db, 0); 139 if (err) 140 goto err_srq; 141 142 *srq->db.db = 0; 143 144 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf)) { 145 err = -ENOMEM; 146 goto err_db; 147 } 148 149 srq->head = 0; 150 srq->tail = srq->msrq.max - 1; 151 srq->wqe_ctr = 0; 152 153 for (i = 0; i < srq->msrq.max; ++i) { 154 next = get_wqe(srq, i); 155 next->next_wqe_index = 156 cpu_to_be16((i + 1) & (srq->msrq.max - 1)); 157 } 158 159 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift, 160 &srq->mtt); 161 if (err) 162 goto err_buf; 163 164 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf); 165 if (err) 166 goto err_mtt; 167 168 srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL); 169 if (!srq->wrid) { 170 err = -ENOMEM; 171 goto err_mtt; 172 } 173 } 174 175 err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, &srq->mtt, 176 srq->db.dma, &srq->msrq); 177 if (err) 178 goto err_wrid; 179 180 srq->msrq.event = mlx4_ib_srq_event; 181 182 if (pd->uobject) 183 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) { 184 err = -EFAULT; 185 goto err_wrid; 186 } 187 188 init_attr->attr.max_wr = srq->msrq.max - 1; 189 190 return &srq->ibsrq; 191 192 err_wrid: 193 if (pd->uobject) 194 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db); 195 else 196 kfree(srq->wrid); 197 198 err_mtt: 199 mlx4_mtt_cleanup(dev->dev, &srq->mtt); 200 201 err_buf: 202 if (pd->uobject) 203 ib_umem_release(srq->umem); 204 else 205 mlx4_buf_free(dev->dev, buf_size, &srq->buf); 206 207 err_db: 208 if (!pd->uobject) 209 mlx4_ib_db_free(dev, &srq->db); 210 211 err_srq: 212 kfree(srq); 213 214 return ERR_PTR(err); 215 } 216 217 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, 218 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) 219 { 220 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device); 221 struct mlx4_ib_srq *srq = to_msrq(ibsrq); 222 int ret; 223 224 /* We don't support resizing SRQs (yet?) */ 225 if (attr_mask & IB_SRQ_MAX_WR) 226 return -EINVAL; 227 228 if (attr_mask & IB_SRQ_LIMIT) { 229 if (attr->srq_limit >= srq->msrq.max) 230 return -EINVAL; 231 232 mutex_lock(&srq->mutex); 233 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit); 234 mutex_unlock(&srq->mutex); 235 236 if (ret) 237 return ret; 238 } 239 240 return 0; 241 } 242 243 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) 244 { 245 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device); 246 struct mlx4_ib_srq *srq = to_msrq(ibsrq); 247 int ret; 248 int limit_watermark; 249 250 ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark); 251 if (ret) 252 return ret; 253 254 srq_attr->srq_limit = limit_watermark; 255 srq_attr->max_wr = srq->msrq.max - 1; 256 srq_attr->max_sge = srq->msrq.max_gs; 257 258 return 0; 259 } 260 261 int mlx4_ib_destroy_srq(struct ib_srq *srq) 262 { 263 struct mlx4_ib_dev *dev = to_mdev(srq->device); 264 struct mlx4_ib_srq *msrq = to_msrq(srq); 265 266 mlx4_srq_free(dev->dev, &msrq->msrq); 267 mlx4_mtt_cleanup(dev->dev, &msrq->mtt); 268 269 if (srq->uobject) { 270 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db); 271 ib_umem_release(msrq->umem); 272 } else { 273 kfree(msrq->wrid); 274 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift, 275 &msrq->buf); 276 mlx4_ib_db_free(dev, &msrq->db); 277 } 278 279 kfree(msrq); 280 281 return 0; 282 } 283 284 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index) 285 { 286 struct mlx4_wqe_srq_next_seg *next; 287 288 /* always called with interrupts disabled. */ 289 spin_lock(&srq->lock); 290 291 next = get_wqe(srq, srq->tail); 292 next->next_wqe_index = cpu_to_be16(wqe_index); 293 srq->tail = wqe_index; 294 295 spin_unlock(&srq->lock); 296 } 297 298 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, 299 struct ib_recv_wr **bad_wr) 300 { 301 struct mlx4_ib_srq *srq = to_msrq(ibsrq); 302 struct mlx4_wqe_srq_next_seg *next; 303 struct mlx4_wqe_data_seg *scat; 304 unsigned long flags; 305 int err = 0; 306 int nreq; 307 int i; 308 309 spin_lock_irqsave(&srq->lock, flags); 310 311 for (nreq = 0; wr; ++nreq, wr = wr->next) { 312 if (unlikely(wr->num_sge > srq->msrq.max_gs)) { 313 err = -EINVAL; 314 *bad_wr = wr; 315 break; 316 } 317 318 if (unlikely(srq->head == srq->tail)) { 319 err = -ENOMEM; 320 *bad_wr = wr; 321 break; 322 } 323 324 srq->wrid[srq->head] = wr->wr_id; 325 326 next = get_wqe(srq, srq->head); 327 srq->head = be16_to_cpu(next->next_wqe_index); 328 scat = (struct mlx4_wqe_data_seg *) (next + 1); 329 330 for (i = 0; i < wr->num_sge; ++i) { 331 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length); 332 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey); 333 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr); 334 } 335 336 if (i < srq->msrq.max_gs) { 337 scat[i].byte_count = 0; 338 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY); 339 scat[i].addr = 0; 340 } 341 } 342 343 if (likely(nreq)) { 344 srq->wqe_ctr += nreq; 345 346 /* 347 * Make sure that descriptors are written before 348 * doorbell record. 349 */ 350 wmb(); 351 352 *srq->db.db = cpu_to_be32(srq->wqe_ctr); 353 } 354 355 spin_unlock_irqrestore(&srq->lock, flags); 356 357 return err; 358 } 359