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 /* 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 -EINVAL; 93 94 mutex_init(&srq->mutex); 95 spin_lock_init(&srq->lock); 96 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1); 97 srq->msrq.max_gs = init_attr->attr.max_sge; 98 99 desc_size = max(32UL, 100 roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) + 101 srq->msrq.max_gs * 102 sizeof (struct mlx4_wqe_data_seg))); 103 srq->msrq.wqe_shift = ilog2(desc_size); 104 105 buf_size = srq->msrq.max * desc_size; 106 107 if (udata) { 108 struct mlx4_ib_create_srq ucmd; 109 110 if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) 111 return -EFAULT; 112 113 srq->umem = 114 ib_umem_get(ib_srq->device, ucmd.buf_addr, buf_size, 0); 115 if (IS_ERR(srq->umem)) 116 return PTR_ERR(srq->umem); 117 118 err = mlx4_mtt_init( 119 dev->dev, ib_umem_num_dma_blocks(srq->umem, PAGE_SIZE), 120 PAGE_SHIFT, &srq->mtt); 121 if (err) 122 goto err_buf; 123 124 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem); 125 if (err) 126 goto err_mtt; 127 128 err = mlx4_ib_db_map_user(udata, ucmd.db_addr, &srq->db); 129 if (err) 130 goto err_mtt; 131 } else { 132 err = mlx4_db_alloc(dev->dev, &srq->db, 0); 133 if (err) 134 return err; 135 136 *srq->db.db = 0; 137 138 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, 139 &srq->buf)) { 140 err = -ENOMEM; 141 goto err_db; 142 } 143 144 srq->head = 0; 145 srq->tail = srq->msrq.max - 1; 146 srq->wqe_ctr = 0; 147 148 for (i = 0; i < srq->msrq.max; ++i) { 149 next = get_wqe(srq, i); 150 next->next_wqe_index = 151 cpu_to_be16((i + 1) & (srq->msrq.max - 1)); 152 153 for (scatter = (void *) (next + 1); 154 (void *) scatter < (void *) next + desc_size; 155 ++scatter) 156 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY); 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 = kvmalloc_array(srq->msrq.max, 169 sizeof(u64), GFP_KERNEL); 170 if (!srq->wrid) { 171 err = -ENOMEM; 172 goto err_mtt; 173 } 174 } 175 176 cqn = ib_srq_has_cq(init_attr->srq_type) ? 177 to_mcq(init_attr->ext.cq)->mcq.cqn : 0; 178 xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ? 179 to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn : 180 (u16) dev->dev->caps.reserved_xrcds; 181 err = mlx4_srq_alloc(dev->dev, to_mpd(ib_srq->pd)->pdn, cqn, xrcdn, 182 &srq->mtt, srq->db.dma, &srq->msrq); 183 if (err) 184 goto err_wrid; 185 186 srq->msrq.event = mlx4_ib_srq_event; 187 srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn; 188 189 if (udata) 190 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) { 191 err = -EFAULT; 192 goto err_wrid; 193 } 194 195 init_attr->attr.max_wr = srq->msrq.max - 1; 196 197 return 0; 198 199 err_wrid: 200 if (udata) 201 mlx4_ib_db_unmap_user(ucontext, &srq->db); 202 else 203 kvfree(srq->wrid); 204 205 err_mtt: 206 mlx4_mtt_cleanup(dev->dev, &srq->mtt); 207 208 err_buf: 209 if (!srq->umem) 210 mlx4_buf_free(dev->dev, buf_size, &srq->buf); 211 ib_umem_release(srq->umem); 212 213 err_db: 214 if (!udata) 215 mlx4_db_free(dev->dev, &srq->db); 216 217 return err; 218 } 219 220 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, 221 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) 222 { 223 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device); 224 struct mlx4_ib_srq *srq = to_msrq(ibsrq); 225 int ret; 226 227 /* We don't support resizing SRQs (yet?) */ 228 if (attr_mask & IB_SRQ_MAX_WR) 229 return -EINVAL; 230 231 if (attr_mask & IB_SRQ_LIMIT) { 232 if (attr->srq_limit >= srq->msrq.max) 233 return -EINVAL; 234 235 mutex_lock(&srq->mutex); 236 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit); 237 mutex_unlock(&srq->mutex); 238 239 if (ret) 240 return ret; 241 } 242 243 return 0; 244 } 245 246 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) 247 { 248 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device); 249 struct mlx4_ib_srq *srq = to_msrq(ibsrq); 250 int ret; 251 int limit_watermark; 252 253 ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark); 254 if (ret) 255 return ret; 256 257 srq_attr->srq_limit = limit_watermark; 258 srq_attr->max_wr = srq->msrq.max - 1; 259 srq_attr->max_sge = srq->msrq.max_gs; 260 261 return 0; 262 } 263 264 int mlx4_ib_destroy_srq(struct ib_srq *srq, struct ib_udata *udata) 265 { 266 struct mlx4_ib_dev *dev = to_mdev(srq->device); 267 struct mlx4_ib_srq *msrq = to_msrq(srq); 268 269 mlx4_srq_free(dev->dev, &msrq->msrq); 270 mlx4_mtt_cleanup(dev->dev, &msrq->mtt); 271 272 if (udata) { 273 mlx4_ib_db_unmap_user( 274 rdma_udata_to_drv_context( 275 udata, 276 struct mlx4_ib_ucontext, 277 ibucontext), 278 &msrq->db); 279 } else { 280 kvfree(msrq->wrid); 281 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift, 282 &msrq->buf); 283 mlx4_db_free(dev->dev, &msrq->db); 284 } 285 ib_umem_release(msrq->umem); 286 return 0; 287 } 288 289 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index) 290 { 291 struct mlx4_wqe_srq_next_seg *next; 292 293 /* always called with interrupts disabled. */ 294 spin_lock(&srq->lock); 295 296 next = get_wqe(srq, srq->tail); 297 next->next_wqe_index = cpu_to_be16(wqe_index); 298 srq->tail = wqe_index; 299 300 spin_unlock(&srq->lock); 301 } 302 303 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr, 304 const struct ib_recv_wr **bad_wr) 305 { 306 struct mlx4_ib_srq *srq = to_msrq(ibsrq); 307 struct mlx4_wqe_srq_next_seg *next; 308 struct mlx4_wqe_data_seg *scat; 309 unsigned long flags; 310 int err = 0; 311 int nreq; 312 int i; 313 struct mlx4_ib_dev *mdev = to_mdev(ibsrq->device); 314 315 spin_lock_irqsave(&srq->lock, flags); 316 if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) { 317 err = -EIO; 318 *bad_wr = wr; 319 nreq = 0; 320 goto out; 321 } 322 323 for (nreq = 0; wr; ++nreq, wr = wr->next) { 324 if (unlikely(wr->num_sge > srq->msrq.max_gs)) { 325 err = -EINVAL; 326 *bad_wr = wr; 327 break; 328 } 329 330 if (unlikely(srq->head == srq->tail)) { 331 err = -ENOMEM; 332 *bad_wr = wr; 333 break; 334 } 335 336 srq->wrid[srq->head] = wr->wr_id; 337 338 next = get_wqe(srq, srq->head); 339 srq->head = be16_to_cpu(next->next_wqe_index); 340 scat = (struct mlx4_wqe_data_seg *) (next + 1); 341 342 for (i = 0; i < wr->num_sge; ++i) { 343 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length); 344 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey); 345 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr); 346 } 347 348 if (i < srq->msrq.max_gs) { 349 scat[i].byte_count = 0; 350 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY); 351 scat[i].addr = 0; 352 } 353 } 354 355 if (likely(nreq)) { 356 srq->wqe_ctr += nreq; 357 358 /* 359 * Make sure that descriptors are written before 360 * doorbell record. 361 */ 362 wmb(); 363 364 *srq->db.db = cpu_to_be32(srq->wqe_ctr); 365 } 366 out: 367 368 spin_unlock_irqrestore(&srq->lock, flags); 369 370 return err; 371 } 372