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 int mlx4_ib_create_srq(struct ib_srq *ib_srq, 73 struct ib_srq_init_attr *init_attr, 74 struct ib_udata *udata) 75 { 76 struct mlx4_ib_dev *dev = to_mdev(ib_srq->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 = to_msrq(ib_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 if (init_attr->srq_type != IB_SRQT_BASIC && 90 init_attr->srq_type != IB_SRQT_XRC) 91 return -EOPNOTSUPP; 92 93 /* Sanity check SRQ size before proceeding */ 94 if (init_attr->attr.max_wr >= dev->dev->caps.max_srq_wqes || 95 init_attr->attr.max_sge > dev->dev->caps.max_srq_sge) 96 return -EINVAL; 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 err = ib_copy_validate_udata_in(udata, ucmd, db_addr); 115 if (err) 116 return err; 117 118 srq->umem = 119 ib_umem_get_va(ib_srq->device, ucmd.buf_addr, buf_size, 0); 120 if (IS_ERR(srq->umem)) 121 return PTR_ERR(srq->umem); 122 123 err = mlx4_mtt_init( 124 dev->dev, ib_umem_num_dma_blocks(srq->umem, PAGE_SIZE), 125 PAGE_SHIFT, &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(udata, 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 return err; 140 141 *srq->db.db = 0; 142 143 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, 144 &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 for (scatter = (void *) (next + 1); 159 (void *) scatter < (void *) next + desc_size; 160 ++scatter) 161 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY); 162 } 163 164 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift, 165 &srq->mtt); 166 if (err) 167 goto err_buf; 168 169 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf); 170 if (err) 171 goto err_mtt; 172 173 srq->wrid = kvmalloc_array(srq->msrq.max, 174 sizeof(u64), GFP_KERNEL); 175 if (!srq->wrid) { 176 err = -ENOMEM; 177 goto err_mtt; 178 } 179 } 180 181 cqn = ib_srq_has_cq(init_attr->srq_type) ? 182 to_mcq(init_attr->ext.cq)->mcq.cqn : 0; 183 xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ? 184 to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn : 185 (u16) dev->dev->caps.reserved_xrcds; 186 err = mlx4_srq_alloc(dev->dev, to_mpd(ib_srq->pd)->pdn, cqn, xrcdn, 187 &srq->mtt, srq->db.dma, &srq->msrq); 188 if (err) 189 goto err_wrid; 190 191 srq->msrq.event = mlx4_ib_srq_event; 192 srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn; 193 194 if (udata) { 195 struct mlx4_ib_create_srq_resp uresp = { 196 .srqn = srq->msrq.srqn 197 }; 198 199 err = ib_respond_udata(udata, uresp); 200 if (err) 201 goto err_srq; 202 } 203 204 init_attr->attr.max_wr = srq->msrq.max - 1; 205 206 return 0; 207 208 err_srq: 209 mlx4_srq_free(dev->dev, &srq->msrq); 210 err_wrid: 211 if (udata) 212 mlx4_ib_db_unmap_user(ucontext, &srq->db); 213 else 214 kvfree(srq->wrid); 215 216 err_mtt: 217 mlx4_mtt_cleanup(dev->dev, &srq->mtt); 218 219 err_buf: 220 if (!srq->umem) 221 mlx4_buf_free(dev->dev, buf_size, &srq->buf); 222 ib_umem_release(srq->umem); 223 224 err_db: 225 if (!udata) 226 mlx4_db_free(dev->dev, &srq->db); 227 228 return 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, struct ib_udata *udata) 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 (udata) { 284 mlx4_ib_db_unmap_user( 285 rdma_udata_to_drv_context( 286 udata, 287 struct mlx4_ib_ucontext, 288 ibucontext), 289 &msrq->db); 290 } else { 291 kvfree(msrq->wrid); 292 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift, 293 &msrq->buf); 294 mlx4_db_free(dev->dev, &msrq->db); 295 } 296 ib_umem_release(msrq->umem); 297 return 0; 298 } 299 300 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index) 301 { 302 struct mlx4_wqe_srq_next_seg *next; 303 304 /* always called with interrupts disabled. */ 305 spin_lock(&srq->lock); 306 307 next = get_wqe(srq, srq->tail); 308 next->next_wqe_index = cpu_to_be16(wqe_index); 309 srq->tail = wqe_index; 310 311 spin_unlock(&srq->lock); 312 } 313 314 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr, 315 const struct ib_recv_wr **bad_wr) 316 { 317 struct mlx4_ib_srq *srq = to_msrq(ibsrq); 318 struct mlx4_wqe_srq_next_seg *next; 319 struct mlx4_wqe_data_seg *scat; 320 unsigned long flags; 321 int err = 0; 322 int nreq; 323 int i; 324 struct mlx4_ib_dev *mdev = to_mdev(ibsrq->device); 325 326 spin_lock_irqsave(&srq->lock, flags); 327 if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) { 328 err = -EIO; 329 *bad_wr = wr; 330 goto out; 331 } 332 333 for (nreq = 0; wr; ++nreq, wr = wr->next) { 334 if (unlikely(wr->num_sge > srq->msrq.max_gs)) { 335 err = -EINVAL; 336 *bad_wr = wr; 337 break; 338 } 339 340 if (unlikely(srq->head == srq->tail)) { 341 err = -ENOMEM; 342 *bad_wr = wr; 343 break; 344 } 345 346 srq->wrid[srq->head] = wr->wr_id; 347 348 next = get_wqe(srq, srq->head); 349 srq->head = be16_to_cpu(next->next_wqe_index); 350 scat = (struct mlx4_wqe_data_seg *) (next + 1); 351 352 for (i = 0; i < wr->num_sge; ++i) { 353 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length); 354 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey); 355 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr); 356 } 357 358 if (i < srq->msrq.max_gs) { 359 scat[i].byte_count = 0; 360 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY); 361 scat[i].addr = 0; 362 } 363 } 364 365 if (likely(nreq)) { 366 srq->wqe_ctr += nreq; 367 368 /* 369 * Make sure that descriptors are written before 370 * doorbell record. 371 */ 372 wmb(); 373 374 *srq->db.db = cpu_to_be32(srq->wqe_ctr); 375 } 376 out: 377 378 spin_unlock_irqrestore(&srq->lock, flags); 379 380 return err; 381 } 382