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 <rdma/mlx4-abi.h> 40 #include <rdma/uverbs_ioctl.h> 41 42 static void *get_wqe(struct mlx4_ib_srq *srq, int n) 43 { 44 return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift); 45 } 46 47 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type) 48 { 49 struct ib_event event; 50 struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq; 51 52 if (ibsrq->event_handler) { 53 event.device = ibsrq->device; 54 event.element.srq = ibsrq; 55 switch (type) { 56 case MLX4_EVENT_TYPE_SRQ_LIMIT: 57 event.event = IB_EVENT_SRQ_LIMIT_REACHED; 58 break; 59 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR: 60 event.event = IB_EVENT_SRQ_ERR; 61 break; 62 default: 63 pr_warn("Unexpected event type %d " 64 "on SRQ %06x\n", type, srq->srqn); 65 return; 66 } 67 68 ibsrq->event_handler(&event, ibsrq->srq_context); 69 } 70 } 71 72 struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd, 73 struct ib_srq_init_attr *init_attr, 74 struct ib_udata *udata) 75 { 76 struct mlx4_ib_dev *dev = to_mdev(pd->device); 77 struct mlx4_ib_ucontext *ucontext = rdma_udata_to_drv_context( 78 udata, struct mlx4_ib_ucontext, ibucontext); 79 struct mlx4_ib_srq *srq; 80 struct mlx4_wqe_srq_next_seg *next; 81 struct mlx4_wqe_data_seg *scatter; 82 u32 cqn; 83 u16 xrcdn; 84 int desc_size; 85 int buf_size; 86 int err; 87 int i; 88 89 /* Sanity check SRQ size before proceeding */ 90 if (init_attr->attr.max_wr >= dev->dev->caps.max_srq_wqes || 91 init_attr->attr.max_sge > dev->dev->caps.max_srq_sge) 92 return ERR_PTR(-EINVAL); 93 94 srq = kmalloc(sizeof *srq, GFP_KERNEL); 95 if (!srq) 96 return ERR_PTR(-ENOMEM); 97 98 mutex_init(&srq->mutex); 99 spin_lock_init(&srq->lock); 100 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1); 101 srq->msrq.max_gs = init_attr->attr.max_sge; 102 103 desc_size = max(32UL, 104 roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) + 105 srq->msrq.max_gs * 106 sizeof (struct mlx4_wqe_data_seg))); 107 srq->msrq.wqe_shift = ilog2(desc_size); 108 109 buf_size = srq->msrq.max * desc_size; 110 111 if (udata) { 112 struct mlx4_ib_create_srq ucmd; 113 114 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) { 115 err = -EFAULT; 116 goto err_srq; 117 } 118 119 srq->umem = ib_umem_get(udata, ucmd.buf_addr, buf_size, 0, 0); 120 if (IS_ERR(srq->umem)) { 121 err = PTR_ERR(srq->umem); 122 goto err_srq; 123 } 124 125 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem), 126 srq->umem->page_shift, &srq->mtt); 127 if (err) 128 goto err_buf; 129 130 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem); 131 if (err) 132 goto err_mtt; 133 134 err = mlx4_ib_db_map_user(ucontext, udata, ucmd.db_addr, 135 &srq->db); 136 if (err) 137 goto err_mtt; 138 } else { 139 err = mlx4_db_alloc(dev->dev, &srq->db, 0); 140 if (err) 141 goto err_srq; 142 143 *srq->db.db = 0; 144 145 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, 146 &srq->buf)) { 147 err = -ENOMEM; 148 goto err_db; 149 } 150 151 srq->head = 0; 152 srq->tail = srq->msrq.max - 1; 153 srq->wqe_ctr = 0; 154 155 for (i = 0; i < srq->msrq.max; ++i) { 156 next = get_wqe(srq, i); 157 next->next_wqe_index = 158 cpu_to_be16((i + 1) & (srq->msrq.max - 1)); 159 160 for (scatter = (void *) (next + 1); 161 (void *) scatter < (void *) next + desc_size; 162 ++scatter) 163 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY); 164 } 165 166 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift, 167 &srq->mtt); 168 if (err) 169 goto err_buf; 170 171 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf); 172 if (err) 173 goto err_mtt; 174 175 srq->wrid = kvmalloc_array(srq->msrq.max, 176 sizeof(u64), GFP_KERNEL); 177 if (!srq->wrid) { 178 err = -ENOMEM; 179 goto err_mtt; 180 } 181 } 182 183 cqn = ib_srq_has_cq(init_attr->srq_type) ? 184 to_mcq(init_attr->ext.cq)->mcq.cqn : 0; 185 xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ? 186 to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn : 187 (u16) dev->dev->caps.reserved_xrcds; 188 err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, cqn, xrcdn, &srq->mtt, 189 srq->db.dma, &srq->msrq); 190 if (err) 191 goto err_wrid; 192 193 srq->msrq.event = mlx4_ib_srq_event; 194 srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn; 195 196 if (udata) 197 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) { 198 err = -EFAULT; 199 goto err_wrid; 200 } 201 202 init_attr->attr.max_wr = srq->msrq.max - 1; 203 204 return &srq->ibsrq; 205 206 err_wrid: 207 if (udata) 208 mlx4_ib_db_unmap_user(ucontext, &srq->db); 209 else 210 kvfree(srq->wrid); 211 212 err_mtt: 213 mlx4_mtt_cleanup(dev->dev, &srq->mtt); 214 215 err_buf: 216 if (srq->umem) 217 ib_umem_release(srq->umem); 218 else 219 mlx4_buf_free(dev->dev, buf_size, &srq->buf); 220 221 err_db: 222 if (!udata) 223 mlx4_db_free(dev->dev, &srq->db); 224 225 err_srq: 226 kfree(srq); 227 228 return ERR_PTR(err); 229 } 230 231 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, 232 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) 233 { 234 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device); 235 struct mlx4_ib_srq *srq = to_msrq(ibsrq); 236 int ret; 237 238 /* We don't support resizing SRQs (yet?) */ 239 if (attr_mask & IB_SRQ_MAX_WR) 240 return -EINVAL; 241 242 if (attr_mask & IB_SRQ_LIMIT) { 243 if (attr->srq_limit >= srq->msrq.max) 244 return -EINVAL; 245 246 mutex_lock(&srq->mutex); 247 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit); 248 mutex_unlock(&srq->mutex); 249 250 if (ret) 251 return ret; 252 } 253 254 return 0; 255 } 256 257 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) 258 { 259 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device); 260 struct mlx4_ib_srq *srq = to_msrq(ibsrq); 261 int ret; 262 int limit_watermark; 263 264 ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark); 265 if (ret) 266 return ret; 267 268 srq_attr->srq_limit = limit_watermark; 269 srq_attr->max_wr = srq->msrq.max - 1; 270 srq_attr->max_sge = srq->msrq.max_gs; 271 272 return 0; 273 } 274 275 int mlx4_ib_destroy_srq(struct ib_srq *srq) 276 { 277 struct mlx4_ib_dev *dev = to_mdev(srq->device); 278 struct mlx4_ib_srq *msrq = to_msrq(srq); 279 280 mlx4_srq_free(dev->dev, &msrq->msrq); 281 mlx4_mtt_cleanup(dev->dev, &msrq->mtt); 282 283 if (srq->uobject) { 284 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db); 285 ib_umem_release(msrq->umem); 286 } else { 287 kvfree(msrq->wrid); 288 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift, 289 &msrq->buf); 290 mlx4_db_free(dev->dev, &msrq->db); 291 } 292 293 kfree(msrq); 294 295 return 0; 296 } 297 298 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index) 299 { 300 struct mlx4_wqe_srq_next_seg *next; 301 302 /* always called with interrupts disabled. */ 303 spin_lock(&srq->lock); 304 305 next = get_wqe(srq, srq->tail); 306 next->next_wqe_index = cpu_to_be16(wqe_index); 307 srq->tail = wqe_index; 308 309 spin_unlock(&srq->lock); 310 } 311 312 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr, 313 const struct ib_recv_wr **bad_wr) 314 { 315 struct mlx4_ib_srq *srq = to_msrq(ibsrq); 316 struct mlx4_wqe_srq_next_seg *next; 317 struct mlx4_wqe_data_seg *scat; 318 unsigned long flags; 319 int err = 0; 320 int nreq; 321 int i; 322 struct mlx4_ib_dev *mdev = to_mdev(ibsrq->device); 323 324 spin_lock_irqsave(&srq->lock, flags); 325 if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) { 326 err = -EIO; 327 *bad_wr = wr; 328 nreq = 0; 329 goto out; 330 } 331 332 for (nreq = 0; wr; ++nreq, wr = wr->next) { 333 if (unlikely(wr->num_sge > srq->msrq.max_gs)) { 334 err = -EINVAL; 335 *bad_wr = wr; 336 break; 337 } 338 339 if (unlikely(srq->head == srq->tail)) { 340 err = -ENOMEM; 341 *bad_wr = wr; 342 break; 343 } 344 345 srq->wrid[srq->head] = wr->wr_id; 346 347 next = get_wqe(srq, srq->head); 348 srq->head = be16_to_cpu(next->next_wqe_index); 349 scat = (struct mlx4_wqe_data_seg *) (next + 1); 350 351 for (i = 0; i < wr->num_sge; ++i) { 352 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length); 353 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey); 354 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr); 355 } 356 357 if (i < srq->msrq.max_gs) { 358 scat[i].byte_count = 0; 359 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY); 360 scat[i].addr = 0; 361 } 362 } 363 364 if (likely(nreq)) { 365 srq->wqe_ctr += nreq; 366 367 /* 368 * Make sure that descriptors are written before 369 * doorbell record. 370 */ 371 wmb(); 372 373 *srq->db.db = cpu_to_be32(srq->wqe_ctr); 374 } 375 out: 376 377 spin_unlock_irqrestore(&srq->lock, flags); 378 379 return err; 380 } 381