Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2005 Cisco Systems. All rights reserved. |
| 3 | * |
| 4 | * This software is available to you under a choice of one of two |
| 5 | * licenses. You may choose to be licensed under the terms of the GNU |
| 6 | * General Public License (GPL) Version 2, available from the file |
| 7 | * COPYING in the main directory of this source tree, or the |
| 8 | * OpenIB.org BSD license below: |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or |
| 11 | * without modification, are permitted provided that the following |
| 12 | * conditions are met: |
| 13 | * |
| 14 | * - Redistributions of source code must retain the above |
| 15 | * copyright notice, this list of conditions and the following |
| 16 | * disclaimer. |
| 17 | * |
| 18 | * - Redistributions in binary form must reproduce the above |
| 19 | * copyright notice, this list of conditions and the following |
| 20 | * disclaimer in the documentation and/or other materials |
| 21 | * provided with the distribution. |
| 22 | * |
| 23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| 27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| 28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 30 | * SOFTWARE. |
| 31 | * |
| 32 | * $Id: mthca_srq.c 3047 2005-08-10 03:59:35Z roland $ |
| 33 | */ |
| 34 | |
Tim Schmielau | 8c65b4a | 2005-11-07 00:59:43 -0800 | [diff] [blame] | 35 | #include <linux/slab.h> |
| 36 | #include <linux/string.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 37 | #include <linux/sched.h> |
Tim Schmielau | 8c65b4a | 2005-11-07 00:59:43 -0800 | [diff] [blame] | 38 | |
Arthur Kepner | 1f5c23e | 2006-10-16 20:22:35 -0700 | [diff] [blame] | 39 | #include <asm/io.h> |
| 40 | |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 41 | #include "mthca_dev.h" |
| 42 | #include "mthca_cmd.h" |
| 43 | #include "mthca_memfree.h" |
| 44 | #include "mthca_wqe.h" |
| 45 | |
| 46 | enum { |
| 47 | MTHCA_MAX_DIRECT_SRQ_SIZE = 4 * PAGE_SIZE |
| 48 | }; |
| 49 | |
| 50 | struct mthca_tavor_srq_context { |
| 51 | __be64 wqe_base_ds; /* low 6 bits is descriptor size */ |
| 52 | __be32 state_pd; |
| 53 | __be32 lkey; |
| 54 | __be32 uar; |
Eli Cohen | fd02e80 | 2006-03-13 14:33:01 +0200 | [diff] [blame] | 55 | __be16 limit_watermark; |
| 56 | __be16 wqe_cnt; |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 57 | u32 reserved[2]; |
| 58 | }; |
| 59 | |
| 60 | struct mthca_arbel_srq_context { |
| 61 | __be32 state_logsize_srqn; |
| 62 | __be32 lkey; |
| 63 | __be32 db_index; |
| 64 | __be32 logstride_usrpage; |
| 65 | __be64 wqe_base; |
| 66 | __be32 eq_pd; |
| 67 | __be16 limit_watermark; |
| 68 | __be16 wqe_cnt; |
| 69 | u16 reserved1; |
| 70 | __be16 wqe_counter; |
| 71 | u32 reserved2[3]; |
| 72 | }; |
| 73 | |
| 74 | static void *get_wqe(struct mthca_srq *srq, int n) |
| 75 | { |
| 76 | if (srq->is_direct) |
| 77 | return srq->queue.direct.buf + (n << srq->wqe_shift); |
| 78 | else |
| 79 | return srq->queue.page_list[(n << srq->wqe_shift) >> PAGE_SHIFT].buf + |
| 80 | ((n << srq->wqe_shift) & (PAGE_SIZE - 1)); |
| 81 | } |
| 82 | |
| 83 | /* |
| 84 | * Return a pointer to the location within a WQE that we're using as a |
Roland Dreier | e5b251a | 2005-10-30 13:07:03 -0800 | [diff] [blame] | 85 | * link when the WQE is in the free list. We use the imm field |
| 86 | * because in the Tavor case, posting a WQE may overwrite the next |
| 87 | * segment of the previous WQE, but a receive WQE will never touch the |
| 88 | * imm field. This avoids corrupting our free list if the previous |
| 89 | * WQE has already completed and been put on the free list when we |
| 90 | * post the next WQE. |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 91 | */ |
| 92 | static inline int *wqe_to_link(void *wqe) |
| 93 | { |
Roland Dreier | e5b251a | 2005-10-30 13:07:03 -0800 | [diff] [blame] | 94 | return (int *) (wqe + offsetof(struct mthca_next_seg, imm)); |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | static void mthca_tavor_init_srq_context(struct mthca_dev *dev, |
| 98 | struct mthca_pd *pd, |
| 99 | struct mthca_srq *srq, |
| 100 | struct mthca_tavor_srq_context *context) |
| 101 | { |
| 102 | memset(context, 0, sizeof *context); |
| 103 | |
| 104 | context->wqe_base_ds = cpu_to_be64(1 << (srq->wqe_shift - 4)); |
| 105 | context->state_pd = cpu_to_be32(pd->pd_num); |
| 106 | context->lkey = cpu_to_be32(srq->mr.ibmr.lkey); |
| 107 | |
| 108 | if (pd->ibpd.uobject) |
| 109 | context->uar = |
| 110 | cpu_to_be32(to_mucontext(pd->ibpd.uobject->context)->uar.index); |
| 111 | else |
| 112 | context->uar = cpu_to_be32(dev->driver_uar.index); |
| 113 | } |
| 114 | |
| 115 | static void mthca_arbel_init_srq_context(struct mthca_dev *dev, |
| 116 | struct mthca_pd *pd, |
| 117 | struct mthca_srq *srq, |
| 118 | struct mthca_arbel_srq_context *context) |
| 119 | { |
David Howells | 6bdd61d | 2007-02-05 16:21:08 -0800 | [diff] [blame] | 120 | int logsize, max; |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 121 | |
| 122 | memset(context, 0, sizeof *context); |
| 123 | |
David Howells | 6bdd61d | 2007-02-05 16:21:08 -0800 | [diff] [blame] | 124 | /* |
| 125 | * Put max in a temporary variable to work around gcc bug |
| 126 | * triggered by ilog2() on sparc64. |
| 127 | */ |
| 128 | max = srq->max; |
| 129 | logsize = ilog2(max); |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 130 | context->state_logsize_srqn = cpu_to_be32(logsize << 24 | srq->srqn); |
| 131 | context->lkey = cpu_to_be32(srq->mr.ibmr.lkey); |
| 132 | context->db_index = cpu_to_be32(srq->db_index); |
| 133 | context->logstride_usrpage = cpu_to_be32((srq->wqe_shift - 4) << 29); |
| 134 | if (pd->ibpd.uobject) |
| 135 | context->logstride_usrpage |= |
| 136 | cpu_to_be32(to_mucontext(pd->ibpd.uobject->context)->uar.index); |
| 137 | else |
| 138 | context->logstride_usrpage |= cpu_to_be32(dev->driver_uar.index); |
| 139 | context->eq_pd = cpu_to_be32(MTHCA_EQ_ASYNC << 24 | pd->pd_num); |
| 140 | } |
| 141 | |
| 142 | static void mthca_free_srq_buf(struct mthca_dev *dev, struct mthca_srq *srq) |
| 143 | { |
| 144 | mthca_buf_free(dev, srq->max << srq->wqe_shift, &srq->queue, |
| 145 | srq->is_direct, &srq->mr); |
| 146 | kfree(srq->wrid); |
| 147 | } |
| 148 | |
| 149 | static int mthca_alloc_srq_buf(struct mthca_dev *dev, struct mthca_pd *pd, |
| 150 | struct mthca_srq *srq) |
| 151 | { |
| 152 | struct mthca_data_seg *scatter; |
| 153 | void *wqe; |
| 154 | int err; |
| 155 | int i; |
| 156 | |
| 157 | if (pd->ibpd.uobject) |
| 158 | return 0; |
| 159 | |
| 160 | srq->wrid = kmalloc(srq->max * sizeof (u64), GFP_KERNEL); |
| 161 | if (!srq->wrid) |
| 162 | return -ENOMEM; |
| 163 | |
| 164 | err = mthca_buf_alloc(dev, srq->max << srq->wqe_shift, |
| 165 | MTHCA_MAX_DIRECT_SRQ_SIZE, |
| 166 | &srq->queue, &srq->is_direct, pd, 1, &srq->mr); |
| 167 | if (err) { |
| 168 | kfree(srq->wrid); |
| 169 | return err; |
| 170 | } |
| 171 | |
| 172 | /* |
| 173 | * Now initialize the SRQ buffer so that all of the WQEs are |
| 174 | * linked into the list of free WQEs. In addition, set the |
| 175 | * scatter list L_Keys to the sentry value of 0x100. |
| 176 | */ |
| 177 | for (i = 0; i < srq->max; ++i) { |
| 178 | wqe = get_wqe(srq, i); |
| 179 | |
| 180 | *wqe_to_link(wqe) = i < srq->max - 1 ? i + 1 : -1; |
| 181 | |
| 182 | for (scatter = wqe + sizeof (struct mthca_next_seg); |
| 183 | (void *) scatter < wqe + (1 << srq->wqe_shift); |
| 184 | ++scatter) |
| 185 | scatter->lkey = cpu_to_be32(MTHCA_INVAL_LKEY); |
| 186 | } |
| 187 | |
Roland Dreier | 6577ae5 | 2005-09-19 09:17:56 -0700 | [diff] [blame] | 188 | srq->last = get_wqe(srq, srq->max - 1); |
| 189 | |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | int mthca_alloc_srq(struct mthca_dev *dev, struct mthca_pd *pd, |
| 194 | struct ib_srq_attr *attr, struct mthca_srq *srq) |
| 195 | { |
| 196 | struct mthca_mailbox *mailbox; |
| 197 | u8 status; |
| 198 | int ds; |
| 199 | int err; |
| 200 | |
| 201 | /* Sanity check SRQ size before proceeding */ |
Jack Morgenstein | efaae8f | 2005-10-10 13:48:07 -0700 | [diff] [blame] | 202 | if (attr->max_wr > dev->limits.max_srq_wqes || |
Jack Morgenstein | 59fef3b | 2006-04-11 18:16:27 +0300 | [diff] [blame] | 203 | attr->max_sge > dev->limits.max_srq_sge) |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 204 | return -EINVAL; |
| 205 | |
| 206 | srq->max = attr->max_wr; |
| 207 | srq->max_gs = attr->max_sge; |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 208 | srq->counter = 0; |
| 209 | |
| 210 | if (mthca_is_memfree(dev)) |
| 211 | srq->max = roundup_pow_of_two(srq->max + 1); |
Michael S. Tsirkin | 2cbe19d | 2006-10-09 18:06:32 +0200 | [diff] [blame] | 212 | else |
| 213 | srq->max = srq->max + 1; |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 214 | |
Jack Morgenstein | 1d7d2f6 | 2006-01-04 14:42:39 -0800 | [diff] [blame] | 215 | ds = max(64UL, |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 216 | roundup_pow_of_two(sizeof (struct mthca_next_seg) + |
| 217 | srq->max_gs * sizeof (struct mthca_data_seg))); |
Jack Morgenstein | ded9ad7 | 2006-03-20 12:35:34 +0200 | [diff] [blame] | 218 | |
Jack Morgenstein | a07bacc | 2006-03-26 17:01:12 +0200 | [diff] [blame] | 219 | if (!mthca_is_memfree(dev) && (ds > dev->limits.max_desc_sz)) |
Jack Morgenstein | ded9ad7 | 2006-03-20 12:35:34 +0200 | [diff] [blame] | 220 | return -EINVAL; |
| 221 | |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 222 | srq->wqe_shift = ilog2(ds); |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 223 | |
| 224 | srq->srqn = mthca_alloc(&dev->srq_table.alloc); |
| 225 | if (srq->srqn == -1) |
| 226 | return -ENOMEM; |
| 227 | |
| 228 | if (mthca_is_memfree(dev)) { |
| 229 | err = mthca_table_get(dev, dev->srq_table.table, srq->srqn); |
| 230 | if (err) |
| 231 | goto err_out; |
| 232 | |
| 233 | if (!pd->ibpd.uobject) { |
| 234 | srq->db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_SRQ, |
| 235 | srq->srqn, &srq->db); |
| 236 | if (srq->db_index < 0) { |
| 237 | err = -ENOMEM; |
| 238 | goto err_out_icm; |
| 239 | } |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL); |
| 244 | if (IS_ERR(mailbox)) { |
| 245 | err = PTR_ERR(mailbox); |
| 246 | goto err_out_db; |
| 247 | } |
| 248 | |
| 249 | err = mthca_alloc_srq_buf(dev, pd, srq); |
| 250 | if (err) |
| 251 | goto err_out_mailbox; |
| 252 | |
| 253 | spin_lock_init(&srq->lock); |
Roland Dreier | a3285aa | 2006-05-09 10:50:29 -0700 | [diff] [blame] | 254 | srq->refcount = 1; |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 255 | init_waitqueue_head(&srq->wait); |
Roland Dreier | c93b6fb | 2006-06-17 20:37:41 -0700 | [diff] [blame] | 256 | mutex_init(&srq->mutex); |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 257 | |
| 258 | if (mthca_is_memfree(dev)) |
| 259 | mthca_arbel_init_srq_context(dev, pd, srq, mailbox->buf); |
| 260 | else |
| 261 | mthca_tavor_init_srq_context(dev, pd, srq, mailbox->buf); |
| 262 | |
| 263 | err = mthca_SW2HW_SRQ(dev, mailbox, srq->srqn, &status); |
| 264 | |
| 265 | if (err) { |
| 266 | mthca_warn(dev, "SW2HW_SRQ failed (%d)\n", err); |
| 267 | goto err_out_free_buf; |
| 268 | } |
| 269 | if (status) { |
| 270 | mthca_warn(dev, "SW2HW_SRQ returned status 0x%02x\n", |
| 271 | status); |
| 272 | err = -EINVAL; |
| 273 | goto err_out_free_buf; |
| 274 | } |
| 275 | |
| 276 | spin_lock_irq(&dev->srq_table.lock); |
| 277 | if (mthca_array_set(&dev->srq_table.srq, |
| 278 | srq->srqn & (dev->limits.num_srqs - 1), |
| 279 | srq)) { |
| 280 | spin_unlock_irq(&dev->srq_table.lock); |
| 281 | goto err_out_free_srq; |
| 282 | } |
| 283 | spin_unlock_irq(&dev->srq_table.lock); |
| 284 | |
| 285 | mthca_free_mailbox(dev, mailbox); |
| 286 | |
| 287 | srq->first_free = 0; |
| 288 | srq->last_free = srq->max - 1; |
| 289 | |
Michael S. Tsirkin | 2cbe19d | 2006-10-09 18:06:32 +0200 | [diff] [blame] | 290 | attr->max_wr = srq->max - 1; |
Dotan Barak | abb6e9b | 2006-02-23 12:13:51 -0800 | [diff] [blame] | 291 | attr->max_sge = srq->max_gs; |
| 292 | |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 293 | return 0; |
| 294 | |
| 295 | err_out_free_srq: |
| 296 | err = mthca_HW2SW_SRQ(dev, mailbox, srq->srqn, &status); |
| 297 | if (err) |
| 298 | mthca_warn(dev, "HW2SW_SRQ failed (%d)\n", err); |
| 299 | else if (status) |
| 300 | mthca_warn(dev, "HW2SW_SRQ returned status 0x%02x\n", status); |
| 301 | |
| 302 | err_out_free_buf: |
| 303 | if (!pd->ibpd.uobject) |
| 304 | mthca_free_srq_buf(dev, srq); |
| 305 | |
| 306 | err_out_mailbox: |
| 307 | mthca_free_mailbox(dev, mailbox); |
| 308 | |
| 309 | err_out_db: |
| 310 | if (!pd->ibpd.uobject && mthca_is_memfree(dev)) |
| 311 | mthca_free_db(dev, MTHCA_DB_TYPE_SRQ, srq->db_index); |
| 312 | |
| 313 | err_out_icm: |
| 314 | mthca_table_put(dev, dev->srq_table.table, srq->srqn); |
| 315 | |
| 316 | err_out: |
| 317 | mthca_free(&dev->srq_table.alloc, srq->srqn); |
| 318 | |
| 319 | return err; |
| 320 | } |
| 321 | |
Roland Dreier | a3285aa | 2006-05-09 10:50:29 -0700 | [diff] [blame] | 322 | static inline int get_srq_refcount(struct mthca_dev *dev, struct mthca_srq *srq) |
| 323 | { |
| 324 | int c; |
| 325 | |
| 326 | spin_lock_irq(&dev->srq_table.lock); |
| 327 | c = srq->refcount; |
| 328 | spin_unlock_irq(&dev->srq_table.lock); |
| 329 | |
| 330 | return c; |
| 331 | } |
| 332 | |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 333 | void mthca_free_srq(struct mthca_dev *dev, struct mthca_srq *srq) |
| 334 | { |
| 335 | struct mthca_mailbox *mailbox; |
| 336 | int err; |
| 337 | u8 status; |
| 338 | |
| 339 | mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL); |
| 340 | if (IS_ERR(mailbox)) { |
| 341 | mthca_warn(dev, "No memory for mailbox to free SRQ.\n"); |
| 342 | return; |
| 343 | } |
| 344 | |
| 345 | err = mthca_HW2SW_SRQ(dev, mailbox, srq->srqn, &status); |
| 346 | if (err) |
| 347 | mthca_warn(dev, "HW2SW_SRQ failed (%d)\n", err); |
| 348 | else if (status) |
| 349 | mthca_warn(dev, "HW2SW_SRQ returned status 0x%02x\n", status); |
| 350 | |
| 351 | spin_lock_irq(&dev->srq_table.lock); |
| 352 | mthca_array_clear(&dev->srq_table.srq, |
| 353 | srq->srqn & (dev->limits.num_srqs - 1)); |
Roland Dreier | a3285aa | 2006-05-09 10:50:29 -0700 | [diff] [blame] | 354 | --srq->refcount; |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 355 | spin_unlock_irq(&dev->srq_table.lock); |
| 356 | |
Roland Dreier | a3285aa | 2006-05-09 10:50:29 -0700 | [diff] [blame] | 357 | wait_event(srq->wait, !get_srq_refcount(dev, srq)); |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 358 | |
| 359 | if (!srq->ibsrq.uobject) { |
| 360 | mthca_free_srq_buf(dev, srq); |
| 361 | if (mthca_is_memfree(dev)) |
| 362 | mthca_free_db(dev, MTHCA_DB_TYPE_SRQ, srq->db_index); |
| 363 | } |
| 364 | |
| 365 | mthca_table_put(dev, dev->srq_table.table, srq->srqn); |
| 366 | mthca_free(&dev->srq_table.alloc, srq->srqn); |
| 367 | mthca_free_mailbox(dev, mailbox); |
| 368 | } |
| 369 | |
Roland Dreier | 90f104d | 2005-10-06 13:15:56 -0700 | [diff] [blame] | 370 | int mthca_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, |
Ralph Campbell | 9bc57e2 | 2006-08-11 14:58:09 -0700 | [diff] [blame] | 371 | enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) |
Roland Dreier | 2fa5e2e | 2006-02-01 13:38:24 -0800 | [diff] [blame] | 372 | { |
Roland Dreier | 90f104d | 2005-10-06 13:15:56 -0700 | [diff] [blame] | 373 | struct mthca_dev *dev = to_mdev(ibsrq->device); |
| 374 | struct mthca_srq *srq = to_msrq(ibsrq); |
| 375 | int ret; |
| 376 | u8 status; |
| 377 | |
| 378 | /* We don't support resizing SRQs (yet?) */ |
| 379 | if (attr_mask & IB_SRQ_MAX_WR) |
| 380 | return -EINVAL; |
| 381 | |
| 382 | if (attr_mask & IB_SRQ_LIMIT) { |
Dotan Barak | 1252c51 | 2006-07-13 11:05:49 +0300 | [diff] [blame] | 383 | u32 max_wr = mthca_is_memfree(dev) ? srq->max - 1 : srq->max; |
| 384 | if (attr->srq_limit > max_wr) |
Jack Morgenstein | d4301e2 | 2006-03-20 17:32:43 +0200 | [diff] [blame] | 385 | return -EINVAL; |
Roland Dreier | c93b6fb | 2006-06-17 20:37:41 -0700 | [diff] [blame] | 386 | |
| 387 | mutex_lock(&srq->mutex); |
Roland Dreier | 90f104d | 2005-10-06 13:15:56 -0700 | [diff] [blame] | 388 | ret = mthca_ARM_SRQ(dev, srq->srqn, attr->srq_limit, &status); |
Roland Dreier | c93b6fb | 2006-06-17 20:37:41 -0700 | [diff] [blame] | 389 | mutex_unlock(&srq->mutex); |
| 390 | |
Roland Dreier | 90f104d | 2005-10-06 13:15:56 -0700 | [diff] [blame] | 391 | if (ret) |
| 392 | return ret; |
| 393 | if (status) |
| 394 | return -EINVAL; |
| 395 | } |
| 396 | |
| 397 | return 0; |
| 398 | } |
| 399 | |
Eli Cohen | 8ebe507 | 2006-02-13 16:40:21 -0800 | [diff] [blame] | 400 | int mthca_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) |
| 401 | { |
| 402 | struct mthca_dev *dev = to_mdev(ibsrq->device); |
| 403 | struct mthca_srq *srq = to_msrq(ibsrq); |
| 404 | struct mthca_mailbox *mailbox; |
| 405 | struct mthca_arbel_srq_context *arbel_ctx; |
Eli Cohen | fd02e80 | 2006-03-13 14:33:01 +0200 | [diff] [blame] | 406 | struct mthca_tavor_srq_context *tavor_ctx; |
Eli Cohen | 8ebe507 | 2006-02-13 16:40:21 -0800 | [diff] [blame] | 407 | u8 status; |
| 408 | int err; |
| 409 | |
| 410 | mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL); |
| 411 | if (IS_ERR(mailbox)) |
| 412 | return PTR_ERR(mailbox); |
| 413 | |
| 414 | err = mthca_QUERY_SRQ(dev, srq->srqn, mailbox, &status); |
| 415 | if (err) |
| 416 | goto out; |
| 417 | |
| 418 | if (mthca_is_memfree(dev)) { |
| 419 | arbel_ctx = mailbox->buf; |
Eli Cohen | fd02e80 | 2006-03-13 14:33:01 +0200 | [diff] [blame] | 420 | srq_attr->srq_limit = be16_to_cpu(arbel_ctx->limit_watermark); |
| 421 | } else { |
| 422 | tavor_ctx = mailbox->buf; |
| 423 | srq_attr->srq_limit = be16_to_cpu(tavor_ctx->limit_watermark); |
| 424 | } |
Eli Cohen | 8ebe507 | 2006-02-13 16:40:21 -0800 | [diff] [blame] | 425 | |
Michael S. Tsirkin | 2cbe19d | 2006-10-09 18:06:32 +0200 | [diff] [blame] | 426 | srq_attr->max_wr = srq->max - 1; |
Eli Cohen | 8ebe507 | 2006-02-13 16:40:21 -0800 | [diff] [blame] | 427 | srq_attr->max_sge = srq->max_gs; |
| 428 | |
| 429 | out: |
| 430 | mthca_free_mailbox(dev, mailbox); |
| 431 | |
| 432 | return err; |
| 433 | } |
| 434 | |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 435 | void mthca_srq_event(struct mthca_dev *dev, u32 srqn, |
| 436 | enum ib_event_type event_type) |
| 437 | { |
| 438 | struct mthca_srq *srq; |
| 439 | struct ib_event event; |
| 440 | |
| 441 | spin_lock(&dev->srq_table.lock); |
| 442 | srq = mthca_array_get(&dev->srq_table.srq, srqn & (dev->limits.num_srqs - 1)); |
| 443 | if (srq) |
Roland Dreier | a3285aa | 2006-05-09 10:50:29 -0700 | [diff] [blame] | 444 | ++srq->refcount; |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 445 | spin_unlock(&dev->srq_table.lock); |
| 446 | |
| 447 | if (!srq) { |
| 448 | mthca_warn(dev, "Async event for bogus SRQ %08x\n", srqn); |
| 449 | return; |
| 450 | } |
| 451 | |
| 452 | if (!srq->ibsrq.event_handler) |
| 453 | goto out; |
| 454 | |
| 455 | event.device = &dev->ib_dev; |
| 456 | event.event = event_type; |
Roland Dreier | 90f104d | 2005-10-06 13:15:56 -0700 | [diff] [blame] | 457 | event.element.srq = &srq->ibsrq; |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 458 | srq->ibsrq.event_handler(&event, srq->ibsrq.srq_context); |
| 459 | |
| 460 | out: |
Roland Dreier | a3285aa | 2006-05-09 10:50:29 -0700 | [diff] [blame] | 461 | spin_lock(&dev->srq_table.lock); |
| 462 | if (!--srq->refcount) |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 463 | wake_up(&srq->wait); |
Roland Dreier | a3285aa | 2006-05-09 10:50:29 -0700 | [diff] [blame] | 464 | spin_unlock(&dev->srq_table.lock); |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 465 | } |
| 466 | |
| 467 | /* |
| 468 | * This function must be called with IRQs disabled. |
| 469 | */ |
| 470 | void mthca_free_srq_wqe(struct mthca_srq *srq, u32 wqe_addr) |
| 471 | { |
| 472 | int ind; |
| 473 | |
| 474 | ind = wqe_addr >> srq->wqe_shift; |
| 475 | |
| 476 | spin_lock(&srq->lock); |
| 477 | |
| 478 | if (likely(srq->first_free >= 0)) |
| 479 | *wqe_to_link(get_wqe(srq, srq->last_free)) = ind; |
| 480 | else |
| 481 | srq->first_free = ind; |
| 482 | |
| 483 | *wqe_to_link(get_wqe(srq, ind)) = -1; |
| 484 | srq->last_free = ind; |
| 485 | |
| 486 | spin_unlock(&srq->lock); |
| 487 | } |
| 488 | |
| 489 | int mthca_tavor_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, |
| 490 | struct ib_recv_wr **bad_wr) |
| 491 | { |
| 492 | struct mthca_dev *dev = to_mdev(ibsrq->device); |
| 493 | struct mthca_srq *srq = to_msrq(ibsrq); |
| 494 | unsigned long flags; |
| 495 | int err = 0; |
| 496 | int first_ind; |
| 497 | int ind; |
| 498 | int next_ind; |
| 499 | int nreq; |
| 500 | int i; |
| 501 | void *wqe; |
| 502 | void *prev_wqe; |
| 503 | |
| 504 | spin_lock_irqsave(&srq->lock, flags); |
| 505 | |
| 506 | first_ind = srq->first_free; |
| 507 | |
Michael S. Tsirkin | ab28b17 | 2006-05-24 18:27:07 +0300 | [diff] [blame] | 508 | for (nreq = 0; wr; wr = wr->next) { |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 509 | ind = srq->first_free; |
| 510 | |
Eli Cohen | 55a98e9 | 2007-10-10 17:55:37 +0200 | [diff] [blame] | 511 | if (unlikely(ind < 0)) { |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 512 | mthca_err(dev, "SRQ %06x full\n", srq->srqn); |
| 513 | err = -ENOMEM; |
| 514 | *bad_wr = wr; |
Roland Dreier | 3853194 | 2005-09-18 14:00:17 -0700 | [diff] [blame] | 515 | break; |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 516 | } |
| 517 | |
| 518 | wqe = get_wqe(srq, ind); |
| 519 | next_ind = *wqe_to_link(wqe); |
Roland Dreier | e23d6d2 | 2005-10-06 13:25:16 -0700 | [diff] [blame] | 520 | |
Eli Cohen | 55a98e9 | 2007-10-10 17:55:37 +0200 | [diff] [blame] | 521 | if (unlikely(next_ind < 0)) { |
Roland Dreier | e23d6d2 | 2005-10-06 13:25:16 -0700 | [diff] [blame] | 522 | mthca_err(dev, "SRQ %06x full\n", srq->srqn); |
| 523 | err = -ENOMEM; |
| 524 | *bad_wr = wr; |
| 525 | break; |
| 526 | } |
| 527 | |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 528 | prev_wqe = srq->last; |
| 529 | srq->last = wqe; |
| 530 | |
| 531 | ((struct mthca_next_seg *) wqe)->nda_op = 0; |
| 532 | ((struct mthca_next_seg *) wqe)->ee_nds = 0; |
| 533 | /* flags field will always remain 0 */ |
| 534 | |
| 535 | wqe += sizeof (struct mthca_next_seg); |
| 536 | |
| 537 | if (unlikely(wr->num_sge > srq->max_gs)) { |
| 538 | err = -EINVAL; |
| 539 | *bad_wr = wr; |
| 540 | srq->last = prev_wqe; |
Roland Dreier | 3853194 | 2005-09-18 14:00:17 -0700 | [diff] [blame] | 541 | break; |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 542 | } |
| 543 | |
| 544 | for (i = 0; i < wr->num_sge; ++i) { |
Roland Dreier | 8088545 | 2007-07-18 11:30:34 -0700 | [diff] [blame] | 545 | mthca_set_data_seg(wqe, wr->sg_list + i); |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 546 | wqe += sizeof (struct mthca_data_seg); |
| 547 | } |
| 548 | |
Roland Dreier | 8088545 | 2007-07-18 11:30:34 -0700 | [diff] [blame] | 549 | if (i < srq->max_gs) |
| 550 | mthca_set_data_seg_inval(wqe); |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 551 | |
Roland Dreier | d6cff02 | 2005-09-13 10:41:03 -0700 | [diff] [blame] | 552 | ((struct mthca_next_seg *) prev_wqe)->nda_op = |
| 553 | cpu_to_be32((ind << srq->wqe_shift) | 1); |
| 554 | wmb(); |
| 555 | ((struct mthca_next_seg *) prev_wqe)->ee_nds = |
| 556 | cpu_to_be32(MTHCA_NEXT_DBD); |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 557 | |
| 558 | srq->wrid[ind] = wr->wr_id; |
| 559 | srq->first_free = next_ind; |
Michael S. Tsirkin | ab28b17 | 2006-05-24 18:27:07 +0300 | [diff] [blame] | 560 | |
| 561 | ++nreq; |
| 562 | if (unlikely(nreq == MTHCA_TAVOR_MAX_WQES_PER_RECV_DB)) { |
| 563 | nreq = 0; |
| 564 | |
Michael S. Tsirkin | ab28b17 | 2006-05-24 18:27:07 +0300 | [diff] [blame] | 565 | /* |
| 566 | * Make sure that descriptors are written |
| 567 | * before doorbell is rung. |
| 568 | */ |
| 569 | wmb(); |
| 570 | |
Roland Dreier | ab8403c | 2007-10-14 20:40:27 -0700 | [diff] [blame] | 571 | mthca_write64(first_ind << srq->wqe_shift, srq->srqn << 8, |
Michael S. Tsirkin | ab28b17 | 2006-05-24 18:27:07 +0300 | [diff] [blame] | 572 | dev->kar + MTHCA_RECEIVE_DOORBELL, |
| 573 | MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock)); |
| 574 | |
| 575 | first_ind = srq->first_free; |
| 576 | } |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 577 | } |
| 578 | |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 579 | if (likely(nreq)) { |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 580 | /* |
| 581 | * Make sure that descriptors are written before |
| 582 | * doorbell is rung. |
| 583 | */ |
| 584 | wmb(); |
| 585 | |
Roland Dreier | ab8403c | 2007-10-14 20:40:27 -0700 | [diff] [blame] | 586 | mthca_write64(first_ind << srq->wqe_shift, (srq->srqn << 8) | nreq, |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 587 | dev->kar + MTHCA_RECEIVE_DOORBELL, |
| 588 | MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock)); |
| 589 | } |
| 590 | |
Arthur Kepner | 1f5c23e | 2006-10-16 20:22:35 -0700 | [diff] [blame] | 591 | /* |
| 592 | * Make sure doorbells don't leak out of SRQ spinlock and |
| 593 | * reach the HCA out of order: |
| 594 | */ |
| 595 | mmiowb(); |
| 596 | |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 597 | spin_unlock_irqrestore(&srq->lock, flags); |
| 598 | return err; |
| 599 | } |
| 600 | |
| 601 | int mthca_arbel_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, |
| 602 | struct ib_recv_wr **bad_wr) |
| 603 | { |
| 604 | struct mthca_dev *dev = to_mdev(ibsrq->device); |
| 605 | struct mthca_srq *srq = to_msrq(ibsrq); |
| 606 | unsigned long flags; |
| 607 | int err = 0; |
| 608 | int ind; |
| 609 | int next_ind; |
| 610 | int nreq; |
| 611 | int i; |
| 612 | void *wqe; |
| 613 | |
| 614 | spin_lock_irqsave(&srq->lock, flags); |
| 615 | |
| 616 | for (nreq = 0; wr; ++nreq, wr = wr->next) { |
| 617 | ind = srq->first_free; |
| 618 | |
Eli Cohen | 55a98e9 | 2007-10-10 17:55:37 +0200 | [diff] [blame] | 619 | if (unlikely(ind < 0)) { |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 620 | mthca_err(dev, "SRQ %06x full\n", srq->srqn); |
| 621 | err = -ENOMEM; |
| 622 | *bad_wr = wr; |
Roland Dreier | 3853194 | 2005-09-18 14:00:17 -0700 | [diff] [blame] | 623 | break; |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 624 | } |
| 625 | |
| 626 | wqe = get_wqe(srq, ind); |
| 627 | next_ind = *wqe_to_link(wqe); |
| 628 | |
Eli Cohen | 55a98e9 | 2007-10-10 17:55:37 +0200 | [diff] [blame] | 629 | if (unlikely(next_ind < 0)) { |
Roland Dreier | e23d6d2 | 2005-10-06 13:25:16 -0700 | [diff] [blame] | 630 | mthca_err(dev, "SRQ %06x full\n", srq->srqn); |
| 631 | err = -ENOMEM; |
| 632 | *bad_wr = wr; |
| 633 | break; |
| 634 | } |
| 635 | |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 636 | ((struct mthca_next_seg *) wqe)->nda_op = |
| 637 | cpu_to_be32((next_ind << srq->wqe_shift) | 1); |
| 638 | ((struct mthca_next_seg *) wqe)->ee_nds = 0; |
| 639 | /* flags field will always remain 0 */ |
| 640 | |
| 641 | wqe += sizeof (struct mthca_next_seg); |
| 642 | |
| 643 | if (unlikely(wr->num_sge > srq->max_gs)) { |
| 644 | err = -EINVAL; |
| 645 | *bad_wr = wr; |
Roland Dreier | 3853194 | 2005-09-18 14:00:17 -0700 | [diff] [blame] | 646 | break; |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 647 | } |
| 648 | |
| 649 | for (i = 0; i < wr->num_sge; ++i) { |
Roland Dreier | 8088545 | 2007-07-18 11:30:34 -0700 | [diff] [blame] | 650 | mthca_set_data_seg(wqe, wr->sg_list + i); |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 651 | wqe += sizeof (struct mthca_data_seg); |
| 652 | } |
| 653 | |
Roland Dreier | 8088545 | 2007-07-18 11:30:34 -0700 | [diff] [blame] | 654 | if (i < srq->max_gs) |
| 655 | mthca_set_data_seg_inval(wqe); |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 656 | |
| 657 | srq->wrid[ind] = wr->wr_id; |
| 658 | srq->first_free = next_ind; |
| 659 | } |
| 660 | |
| 661 | if (likely(nreq)) { |
| 662 | srq->counter += nreq; |
| 663 | |
| 664 | /* |
| 665 | * Make sure that descriptors are written before |
| 666 | * we write doorbell record. |
| 667 | */ |
| 668 | wmb(); |
| 669 | *srq->db = cpu_to_be32(srq->counter); |
| 670 | } |
| 671 | |
| 672 | spin_unlock_irqrestore(&srq->lock, flags); |
| 673 | return err; |
| 674 | } |
| 675 | |
Jack Morgenstein | 59fef3b | 2006-04-11 18:16:27 +0300 | [diff] [blame] | 676 | int mthca_max_srq_sge(struct mthca_dev *dev) |
| 677 | { |
| 678 | if (mthca_is_memfree(dev)) |
| 679 | return dev->limits.max_sg; |
| 680 | |
| 681 | /* |
| 682 | * SRQ allocations are based on powers of 2 for Tavor, |
| 683 | * (although they only need to be multiples of 16 bytes). |
| 684 | * |
| 685 | * Therefore, we need to base the max number of sg entries on |
| 686 | * the largest power of 2 descriptor size that is <= to the |
| 687 | * actual max WQE descriptor size, rather than return the |
| 688 | * max_sg value given by the firmware (which is based on WQE |
| 689 | * sizes as multiples of 16, not powers of 2). |
| 690 | * |
| 691 | * If SRQ implementation is changed for Tavor to be based on |
| 692 | * multiples of 16, the calculation below can be deleted and |
| 693 | * the FW max_sg value returned. |
| 694 | */ |
| 695 | return min_t(int, dev->limits.max_sg, |
| 696 | ((1 << (fls(dev->limits.max_desc_sz) - 1)) - |
| 697 | sizeof (struct mthca_next_seg)) / |
| 698 | sizeof (struct mthca_data_seg)); |
| 699 | } |
| 700 | |
Roland Dreier | f4f3d0f | 2006-11-29 15:33:06 -0800 | [diff] [blame] | 701 | int mthca_init_srq_table(struct mthca_dev *dev) |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 702 | { |
| 703 | int err; |
| 704 | |
| 705 | if (!(dev->mthca_flags & MTHCA_FLAG_SRQ)) |
| 706 | return 0; |
| 707 | |
| 708 | spin_lock_init(&dev->srq_table.lock); |
| 709 | |
| 710 | err = mthca_alloc_init(&dev->srq_table.alloc, |
| 711 | dev->limits.num_srqs, |
| 712 | dev->limits.num_srqs - 1, |
| 713 | dev->limits.reserved_srqs); |
| 714 | if (err) |
| 715 | return err; |
| 716 | |
| 717 | err = mthca_array_init(&dev->srq_table.srq, |
| 718 | dev->limits.num_srqs); |
| 719 | if (err) |
| 720 | mthca_alloc_cleanup(&dev->srq_table.alloc); |
| 721 | |
| 722 | return err; |
| 723 | } |
| 724 | |
Roland Dreier | e1f7868 | 2006-03-29 09:36:46 -0800 | [diff] [blame] | 725 | void mthca_cleanup_srq_table(struct mthca_dev *dev) |
Roland Dreier | ec34a92 | 2005-08-19 10:59:31 -0700 | [diff] [blame] | 726 | { |
| 727 | if (!(dev->mthca_flags & MTHCA_FLAG_SRQ)) |
| 728 | return; |
| 729 | |
| 730 | mthca_array_cleanup(&dev->srq_table.srq, dev->limits.num_srqs); |
| 731 | mthca_alloc_cleanup(&dev->srq_table.alloc); |
| 732 | } |