1 /* 2 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34 #include <linux/mlx4/qp.h> 35 #include <linux/mlx4/srq.h> 36 #include <linux/slab.h> 37 38 #include "mlx4_ib.h" 39 #include "user.h" 40 41 static void *get_wqe(struct mlx4_ib_srq *srq, int n) 42 { 43 return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift); 44 } 45 46 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type) 47 { 48 struct ib_event event; 49 struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq; 50 51 if (ibsrq->event_handler) { 52 event.device = ibsrq->device; 53 event.element.srq = ibsrq; 54 switch (type) { 55 case MLX4_EVENT_TYPE_SRQ_LIMIT: 56 event.event = IB_EVENT_SRQ_LIMIT_REACHED; 57 break; 58 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR: 59 event.event = IB_EVENT_SRQ_ERR; 60 break; 61 default: 62 pr_warn("Unexpected event type %d " 63 "on SRQ %06x\n", type, srq->srqn); 64 return; 65 } 66 67 ibsrq->event_handler(&event, ibsrq->srq_context); 68 } 69 } 70 71 struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd, 72 struct ib_srq_init_attr *init_attr, 73 struct ib_udata *udata) 74 { 75 struct mlx4_ib_dev *dev = to_mdev(pd->device); 76 struct mlx4_ib_srq *srq; 77 struct mlx4_wqe_srq_next_seg *next; 78 struct mlx4_wqe_data_seg *scatter; 79 u32 cqn; 80 u16 xrcdn; 81 int desc_size; 82 int buf_size; 83 int err; 84 int i; 85 86 /* Sanity check SRQ size before proceeding */ 87 if (init_attr->attr.max_wr >= dev->dev->caps.max_srq_wqes || 88 init_attr->attr.max_sge > dev->dev->caps.max_srq_sge) 89 return ERR_PTR(-EINVAL); 90 91 srq = kmalloc(sizeof *srq, GFP_KERNEL); 92 if (!srq) 93 return ERR_PTR(-ENOMEM); 94 95 mutex_init(&srq->mutex); 96 spin_lock_init(&srq->lock); 97 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1); 98 srq->msrq.max_gs = init_attr->attr.max_sge; 99 100 desc_size = max(32UL, 101 roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) + 102 srq->msrq.max_gs * 103 sizeof (struct mlx4_wqe_data_seg))); 104 srq->msrq.wqe_shift = ilog2(desc_size); 105 106 buf_size = srq->msrq.max * desc_size; 107 108 if (pd->uobject) { 109 struct mlx4_ib_create_srq ucmd; 110 111 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) { 112 err = -EFAULT; 113 goto err_srq; 114 } 115 116 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, 117 buf_size, 0, 0); 118 if (IS_ERR(srq->umem)) { 119 err = PTR_ERR(srq->umem); 120 goto err_srq; 121 } 122 123 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem), 124 ilog2(srq->umem->page_size), &srq->mtt); 125 if (err) 126 goto err_buf; 127 128 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem); 129 if (err) 130 goto err_mtt; 131 132 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context), 133 ucmd.db_addr, &srq->db); 134 if (err) 135 goto err_mtt; 136 } else { 137 err = mlx4_db_alloc(dev->dev, &srq->db, 0); 138 if (err) 139 goto err_srq; 140 141 *srq->db.db = 0; 142 143 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf)) { 144 err = -ENOMEM; 145 goto err_db; 146 } 147 148 srq->head = 0; 149 srq->tail = srq->msrq.max - 1; 150 srq->wqe_ctr = 0; 151 152 for (i = 0; i < srq->msrq.max; ++i) { 153 next = get_wqe(srq, i); 154 next->next_wqe_index = 155 cpu_to_be16((i + 1) & (srq->msrq.max - 1)); 156 157 for (scatter = (void *) (next + 1); 158 (void *) scatter < (void *) next + desc_size; 159 ++scatter) 160 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY); 161 } 162 163 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift, 164 &srq->mtt); 165 if (err) 166 goto err_buf; 167 168 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf); 169 if (err) 170 goto err_mtt; 171 172 srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL); 173 if (!srq->wrid) { 174 err = -ENOMEM; 175 goto err_mtt; 176 } 177 } 178 179 cqn = (init_attr->srq_type == IB_SRQT_XRC) ? 180 to_mcq(init_attr->ext.xrc.cq)->mcq.cqn : 0; 181 xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ? 182 to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn : 183 (u16) dev->dev->caps.reserved_xrcds; 184 err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, cqn, xrcdn, &srq->mtt, 185 srq->db.dma, &srq->msrq); 186 if (err) 187 goto err_wrid; 188 189 srq->msrq.event = mlx4_ib_srq_event; 190 srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn; 191 192 if (pd->uobject) 193 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) { 194 err = -EFAULT; 195 goto err_wrid; 196 } 197 198 init_attr->attr.max_wr = srq->msrq.max - 1; 199 200 return &srq->ibsrq; 201 202 err_wrid: 203 if (pd->uobject) 204 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db); 205 else 206 kfree(srq->wrid); 207 208 err_mtt: 209 mlx4_mtt_cleanup(dev->dev, &srq->mtt); 210 211 err_buf: 212 if (pd->uobject) 213 ib_umem_release(srq->umem); 214 else 215 mlx4_buf_free(dev->dev, buf_size, &srq->buf); 216 217 err_db: 218 if (!pd->uobject) 219 mlx4_db_free(dev->dev, &srq->db); 220 221 err_srq: 222 kfree(srq); 223 224 return ERR_PTR(err); 225 } 226 227 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, 228 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) 229 { 230 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device); 231 struct mlx4_ib_srq *srq = to_msrq(ibsrq); 232 int ret; 233 234 /* We don't support resizing SRQs (yet?) */ 235 if (attr_mask & IB_SRQ_MAX_WR) 236 return -EINVAL; 237 238 if (attr_mask & IB_SRQ_LIMIT) { 239 if (attr->srq_limit >= srq->msrq.max) 240 return -EINVAL; 241 242 mutex_lock(&srq->mutex); 243 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit); 244 mutex_unlock(&srq->mutex); 245 246 if (ret) 247 return ret; 248 } 249 250 return 0; 251 } 252 253 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) 254 { 255 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device); 256 struct mlx4_ib_srq *srq = to_msrq(ibsrq); 257 int ret; 258 int limit_watermark; 259 260 ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark); 261 if (ret) 262 return ret; 263 264 srq_attr->srq_limit = limit_watermark; 265 srq_attr->max_wr = srq->msrq.max - 1; 266 srq_attr->max_sge = srq->msrq.max_gs; 267 268 return 0; 269 } 270 271 int mlx4_ib_destroy_srq(struct ib_srq *srq) 272 { 273 struct mlx4_ib_dev *dev = to_mdev(srq->device); 274 struct mlx4_ib_srq *msrq = to_msrq(srq); 275 276 mlx4_srq_free(dev->dev, &msrq->msrq); 277 mlx4_mtt_cleanup(dev->dev, &msrq->mtt); 278 279 if (srq->uobject) { 280 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db); 281 ib_umem_release(msrq->umem); 282 } else { 283 kfree(msrq->wrid); 284 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift, 285 &msrq->buf); 286 mlx4_db_free(dev->dev, &msrq->db); 287 } 288 289 kfree(msrq); 290 291 return 0; 292 } 293 294 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index) 295 { 296 struct mlx4_wqe_srq_next_seg *next; 297 298 /* always called with interrupts disabled. */ 299 spin_lock(&srq->lock); 300 301 next = get_wqe(srq, srq->tail); 302 next->next_wqe_index = cpu_to_be16(wqe_index); 303 srq->tail = wqe_index; 304 305 spin_unlock(&srq->lock); 306 } 307 308 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, 309 struct ib_recv_wr **bad_wr) 310 { 311 struct mlx4_ib_srq *srq = to_msrq(ibsrq); 312 struct mlx4_wqe_srq_next_seg *next; 313 struct mlx4_wqe_data_seg *scat; 314 unsigned long flags; 315 int err = 0; 316 int nreq; 317 int i; 318 319 spin_lock_irqsave(&srq->lock, flags); 320 321 for (nreq = 0; wr; ++nreq, wr = wr->next) { 322 if (unlikely(wr->num_sge > srq->msrq.max_gs)) { 323 err = -EINVAL; 324 *bad_wr = wr; 325 break; 326 } 327 328 if (unlikely(srq->head == srq->tail)) { 329 err = -ENOMEM; 330 *bad_wr = wr; 331 break; 332 } 333 334 srq->wrid[srq->head] = wr->wr_id; 335 336 next = get_wqe(srq, srq->head); 337 srq->head = be16_to_cpu(next->next_wqe_index); 338 scat = (struct mlx4_wqe_data_seg *) (next + 1); 339 340 for (i = 0; i < wr->num_sge; ++i) { 341 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length); 342 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey); 343 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr); 344 } 345 346 if (i < srq->msrq.max_gs) { 347 scat[i].byte_count = 0; 348 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY); 349 scat[i].addr = 0; 350 } 351 } 352 353 if (likely(nreq)) { 354 srq->wqe_ctr += nreq; 355 356 /* 357 * Make sure that descriptors are written before 358 * doorbell record. 359 */ 360 wmb(); 361 362 *srq->db.db = cpu_to_be32(srq->wqe_ctr); 363 } 364 365 spin_unlock_irqrestore(&srq->lock, flags); 366 367 return err; 368 } 369