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 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 srq->umem->page_shift, &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, 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(pd)->pdn, cqn, xrcdn, &srq->mtt, 187 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 (pd->uobject) 195 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) { 196 err = -EFAULT; 197 goto err_wrid; 198 } 199 200 init_attr->attr.max_wr = srq->msrq.max - 1; 201 202 return &srq->ibsrq; 203 204 err_wrid: 205 if (pd->uobject) 206 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db); 207 else 208 kvfree(srq->wrid); 209 210 err_mtt: 211 mlx4_mtt_cleanup(dev->dev, &srq->mtt); 212 213 err_buf: 214 if (pd->uobject) 215 ib_umem_release(srq->umem); 216 else 217 mlx4_buf_free(dev->dev, buf_size, &srq->buf); 218 219 err_db: 220 if (!pd->uobject) 221 mlx4_db_free(dev->dev, &srq->db); 222 223 err_srq: 224 kfree(srq); 225 226 return ERR_PTR(err); 227 } 228 229 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, 230 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) 231 { 232 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device); 233 struct mlx4_ib_srq *srq = to_msrq(ibsrq); 234 int ret; 235 236 /* We don't support resizing SRQs (yet?) */ 237 if (attr_mask & IB_SRQ_MAX_WR) 238 return -EINVAL; 239 240 if (attr_mask & IB_SRQ_LIMIT) { 241 if (attr->srq_limit >= srq->msrq.max) 242 return -EINVAL; 243 244 mutex_lock(&srq->mutex); 245 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit); 246 mutex_unlock(&srq->mutex); 247 248 if (ret) 249 return ret; 250 } 251 252 return 0; 253 } 254 255 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) 256 { 257 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device); 258 struct mlx4_ib_srq *srq = to_msrq(ibsrq); 259 int ret; 260 int limit_watermark; 261 262 ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark); 263 if (ret) 264 return ret; 265 266 srq_attr->srq_limit = limit_watermark; 267 srq_attr->max_wr = srq->msrq.max - 1; 268 srq_attr->max_sge = srq->msrq.max_gs; 269 270 return 0; 271 } 272 273 int mlx4_ib_destroy_srq(struct ib_srq *srq) 274 { 275 struct mlx4_ib_dev *dev = to_mdev(srq->device); 276 struct mlx4_ib_srq *msrq = to_msrq(srq); 277 278 mlx4_srq_free(dev->dev, &msrq->msrq); 279 mlx4_mtt_cleanup(dev->dev, &msrq->mtt); 280 281 if (srq->uobject) { 282 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db); 283 ib_umem_release(msrq->umem); 284 } else { 285 kvfree(msrq->wrid); 286 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift, 287 &msrq->buf); 288 mlx4_db_free(dev->dev, &msrq->db); 289 } 290 291 kfree(msrq); 292 293 return 0; 294 } 295 296 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index) 297 { 298 struct mlx4_wqe_srq_next_seg *next; 299 300 /* always called with interrupts disabled. */ 301 spin_lock(&srq->lock); 302 303 next = get_wqe(srq, srq->tail); 304 next->next_wqe_index = cpu_to_be16(wqe_index); 305 srq->tail = wqe_index; 306 307 spin_unlock(&srq->lock); 308 } 309 310 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, 311 struct ib_recv_wr **bad_wr) 312 { 313 struct mlx4_ib_srq *srq = to_msrq(ibsrq); 314 struct mlx4_wqe_srq_next_seg *next; 315 struct mlx4_wqe_data_seg *scat; 316 unsigned long flags; 317 int err = 0; 318 int nreq; 319 int i; 320 struct mlx4_ib_dev *mdev = to_mdev(ibsrq->device); 321 322 spin_lock_irqsave(&srq->lock, flags); 323 if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) { 324 err = -EIO; 325 *bad_wr = wr; 326 nreq = 0; 327 goto out; 328 } 329 330 for (nreq = 0; wr; ++nreq, wr = wr->next) { 331 if (unlikely(wr->num_sge > srq->msrq.max_gs)) { 332 err = -EINVAL; 333 *bad_wr = wr; 334 break; 335 } 336 337 if (unlikely(srq->head == srq->tail)) { 338 err = -ENOMEM; 339 *bad_wr = wr; 340 break; 341 } 342 343 srq->wrid[srq->head] = wr->wr_id; 344 345 next = get_wqe(srq, srq->head); 346 srq->head = be16_to_cpu(next->next_wqe_index); 347 scat = (struct mlx4_wqe_data_seg *) (next + 1); 348 349 for (i = 0; i < wr->num_sge; ++i) { 350 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length); 351 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey); 352 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr); 353 } 354 355 if (i < srq->msrq.max_gs) { 356 scat[i].byte_count = 0; 357 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY); 358 scat[i].addr = 0; 359 } 360 } 361 362 if (likely(nreq)) { 363 srq->wqe_ctr += nreq; 364 365 /* 366 * Make sure that descriptors are written before 367 * doorbell record. 368 */ 369 wmb(); 370 371 *srq->db.db = cpu_to_be32(srq->wqe_ctr); 372 } 373 out: 374 375 spin_unlock_irqrestore(&srq->lock, flags); 376 377 return err; 378 } 379