1 /* 2 * Copyright (c) 2016 Oracle. 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 33 #include "ib_mr.h" 34 35 static struct rds_ib_mr *rds_ib_alloc_frmr(struct rds_ib_device *rds_ibdev, 36 int npages) 37 { 38 struct rds_ib_mr_pool *pool; 39 struct rds_ib_mr *ibmr = NULL; 40 struct rds_ib_frmr *frmr; 41 int err = 0; 42 43 if (npages <= RDS_MR_8K_MSG_SIZE) 44 pool = rds_ibdev->mr_8k_pool; 45 else 46 pool = rds_ibdev->mr_1m_pool; 47 48 ibmr = rds_ib_try_reuse_ibmr(pool); 49 if (ibmr) 50 return ibmr; 51 52 ibmr = kzalloc_node(sizeof(*ibmr), GFP_KERNEL, 53 rdsibdev_to_node(rds_ibdev)); 54 if (!ibmr) { 55 err = -ENOMEM; 56 goto out_no_cigar; 57 } 58 59 frmr = &ibmr->u.frmr; 60 frmr->mr = ib_alloc_mr(rds_ibdev->pd, IB_MR_TYPE_MEM_REG, 61 pool->fmr_attr.max_pages); 62 if (IS_ERR(frmr->mr)) { 63 pr_warn("RDS/IB: %s failed to allocate MR", __func__); 64 goto out_no_cigar; 65 } 66 67 ibmr->pool = pool; 68 if (pool->pool_type == RDS_IB_MR_8K_POOL) 69 rds_ib_stats_inc(s_ib_rdma_mr_8k_alloc); 70 else 71 rds_ib_stats_inc(s_ib_rdma_mr_1m_alloc); 72 73 if (atomic_read(&pool->item_count) > pool->max_items_soft) 74 pool->max_items_soft = pool->max_items; 75 76 frmr->fr_state = FRMR_IS_FREE; 77 return ibmr; 78 79 out_no_cigar: 80 kfree(ibmr); 81 atomic_dec(&pool->item_count); 82 return ERR_PTR(err); 83 } 84 85 static void rds_ib_free_frmr(struct rds_ib_mr *ibmr, bool drop) 86 { 87 struct rds_ib_mr_pool *pool = ibmr->pool; 88 89 if (drop) 90 llist_add(&ibmr->llnode, &pool->drop_list); 91 else 92 llist_add(&ibmr->llnode, &pool->free_list); 93 atomic_add(ibmr->sg_len, &pool->free_pinned); 94 atomic_inc(&pool->dirty_count); 95 96 /* If we've pinned too many pages, request a flush */ 97 if (atomic_read(&pool->free_pinned) >= pool->max_free_pinned || 98 atomic_read(&pool->dirty_count) >= pool->max_items / 5) 99 queue_delayed_work(rds_ib_mr_wq, &pool->flush_worker, 10); 100 } 101 102 static int rds_ib_post_reg_frmr(struct rds_ib_mr *ibmr) 103 { 104 struct rds_ib_frmr *frmr = &ibmr->u.frmr; 105 struct ib_send_wr *failed_wr; 106 struct ib_reg_wr reg_wr; 107 int ret, off = 0; 108 109 while (atomic_dec_return(&ibmr->ic->i_fastreg_wrs) <= 0) { 110 atomic_inc(&ibmr->ic->i_fastreg_wrs); 111 cpu_relax(); 112 } 113 114 ret = ib_map_mr_sg_zbva(frmr->mr, ibmr->sg, ibmr->sg_len, 115 &off, PAGE_SIZE); 116 if (unlikely(ret != ibmr->sg_len)) 117 return ret < 0 ? ret : -EINVAL; 118 119 /* Perform a WR for the fast_reg_mr. Each individual page 120 * in the sg list is added to the fast reg page list and placed 121 * inside the fast_reg_mr WR. The key used is a rolling 8bit 122 * counter, which should guarantee uniqueness. 123 */ 124 ib_update_fast_reg_key(frmr->mr, ibmr->remap_count++); 125 frmr->fr_state = FRMR_IS_INUSE; 126 127 memset(®_wr, 0, sizeof(reg_wr)); 128 reg_wr.wr.wr_id = (unsigned long)(void *)ibmr; 129 reg_wr.wr.opcode = IB_WR_REG_MR; 130 reg_wr.wr.num_sge = 0; 131 reg_wr.mr = frmr->mr; 132 reg_wr.key = frmr->mr->rkey; 133 reg_wr.access = IB_ACCESS_LOCAL_WRITE | 134 IB_ACCESS_REMOTE_READ | 135 IB_ACCESS_REMOTE_WRITE; 136 reg_wr.wr.send_flags = IB_SEND_SIGNALED; 137 138 failed_wr = ®_wr.wr; 139 ret = ib_post_send(ibmr->ic->i_cm_id->qp, ®_wr.wr, &failed_wr); 140 WARN_ON(failed_wr != ®_wr.wr); 141 if (unlikely(ret)) { 142 /* Failure here can be because of -ENOMEM as well */ 143 frmr->fr_state = FRMR_IS_STALE; 144 atomic_inc(&ibmr->ic->i_fastreg_wrs); 145 if (printk_ratelimit()) 146 pr_warn("RDS/IB: %s returned error(%d)\n", 147 __func__, ret); 148 } 149 return ret; 150 } 151 152 static int rds_ib_map_frmr(struct rds_ib_device *rds_ibdev, 153 struct rds_ib_mr_pool *pool, 154 struct rds_ib_mr *ibmr, 155 struct scatterlist *sg, unsigned int sg_len) 156 { 157 struct ib_device *dev = rds_ibdev->dev; 158 struct rds_ib_frmr *frmr = &ibmr->u.frmr; 159 int i; 160 u32 len; 161 int ret = 0; 162 163 /* We want to teardown old ibmr values here and fill it up with 164 * new sg values 165 */ 166 rds_ib_teardown_mr(ibmr); 167 168 ibmr->sg = sg; 169 ibmr->sg_len = sg_len; 170 ibmr->sg_dma_len = 0; 171 frmr->sg_byte_len = 0; 172 WARN_ON(ibmr->sg_dma_len); 173 ibmr->sg_dma_len = ib_dma_map_sg(dev, ibmr->sg, ibmr->sg_len, 174 DMA_BIDIRECTIONAL); 175 if (unlikely(!ibmr->sg_dma_len)) { 176 pr_warn("RDS/IB: %s failed!\n", __func__); 177 return -EBUSY; 178 } 179 180 frmr->sg_byte_len = 0; 181 frmr->dma_npages = 0; 182 len = 0; 183 184 ret = -EINVAL; 185 for (i = 0; i < ibmr->sg_dma_len; ++i) { 186 unsigned int dma_len = ib_sg_dma_len(dev, &ibmr->sg[i]); 187 u64 dma_addr = ib_sg_dma_address(dev, &ibmr->sg[i]); 188 189 frmr->sg_byte_len += dma_len; 190 if (dma_addr & ~PAGE_MASK) { 191 if (i > 0) 192 goto out_unmap; 193 else 194 ++frmr->dma_npages; 195 } 196 197 if ((dma_addr + dma_len) & ~PAGE_MASK) { 198 if (i < ibmr->sg_dma_len - 1) 199 goto out_unmap; 200 else 201 ++frmr->dma_npages; 202 } 203 204 len += dma_len; 205 } 206 frmr->dma_npages += len >> PAGE_SHIFT; 207 208 if (frmr->dma_npages > ibmr->pool->fmr_attr.max_pages) { 209 ret = -EMSGSIZE; 210 goto out_unmap; 211 } 212 213 ret = rds_ib_post_reg_frmr(ibmr); 214 if (ret) 215 goto out_unmap; 216 217 if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL) 218 rds_ib_stats_inc(s_ib_rdma_mr_8k_used); 219 else 220 rds_ib_stats_inc(s_ib_rdma_mr_1m_used); 221 222 return ret; 223 224 out_unmap: 225 ib_dma_unmap_sg(rds_ibdev->dev, ibmr->sg, ibmr->sg_len, 226 DMA_BIDIRECTIONAL); 227 ibmr->sg_dma_len = 0; 228 return ret; 229 } 230 231 static int rds_ib_post_inv(struct rds_ib_mr *ibmr) 232 { 233 struct ib_send_wr *s_wr, *failed_wr; 234 struct rds_ib_frmr *frmr = &ibmr->u.frmr; 235 struct rdma_cm_id *i_cm_id = ibmr->ic->i_cm_id; 236 int ret = -EINVAL; 237 238 if (!i_cm_id || !i_cm_id->qp || !frmr->mr) 239 goto out; 240 241 if (frmr->fr_state != FRMR_IS_INUSE) 242 goto out; 243 244 while (atomic_dec_return(&ibmr->ic->i_fastunreg_wrs) <= 0) { 245 atomic_inc(&ibmr->ic->i_fastunreg_wrs); 246 cpu_relax(); 247 } 248 249 frmr->fr_inv = true; 250 s_wr = &frmr->fr_wr; 251 252 memset(s_wr, 0, sizeof(*s_wr)); 253 s_wr->wr_id = (unsigned long)(void *)ibmr; 254 s_wr->opcode = IB_WR_LOCAL_INV; 255 s_wr->ex.invalidate_rkey = frmr->mr->rkey; 256 s_wr->send_flags = IB_SEND_SIGNALED; 257 258 failed_wr = s_wr; 259 ret = ib_post_send(i_cm_id->qp, s_wr, &failed_wr); 260 WARN_ON(failed_wr != s_wr); 261 if (unlikely(ret)) { 262 frmr->fr_state = FRMR_IS_STALE; 263 frmr->fr_inv = false; 264 atomic_inc(&ibmr->ic->i_fastunreg_wrs); 265 pr_err("RDS/IB: %s returned error(%d)\n", __func__, ret); 266 goto out; 267 } 268 out: 269 return ret; 270 } 271 272 void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc) 273 { 274 struct rds_ib_mr *ibmr = (void *)(unsigned long)wc->wr_id; 275 struct rds_ib_frmr *frmr = &ibmr->u.frmr; 276 277 if (wc->status != IB_WC_SUCCESS) { 278 frmr->fr_state = FRMR_IS_STALE; 279 if (rds_conn_up(ic->conn)) 280 rds_ib_conn_error(ic->conn, 281 "frmr completion <%pI4,%pI4> status %u(%s), vendor_err 0x%x, disconnecting and reconnecting\n", 282 &ic->conn->c_laddr, 283 &ic->conn->c_faddr, 284 wc->status, 285 ib_wc_status_msg(wc->status), 286 wc->vendor_err); 287 } 288 289 if (frmr->fr_inv) { 290 frmr->fr_state = FRMR_IS_FREE; 291 frmr->fr_inv = false; 292 atomic_inc(&ic->i_fastreg_wrs); 293 } else { 294 atomic_inc(&ic->i_fastunreg_wrs); 295 } 296 } 297 298 void rds_ib_unreg_frmr(struct list_head *list, unsigned int *nfreed, 299 unsigned long *unpinned, unsigned int goal) 300 { 301 struct rds_ib_mr *ibmr, *next; 302 struct rds_ib_frmr *frmr; 303 int ret = 0; 304 unsigned int freed = *nfreed; 305 306 /* String all ib_mr's onto one list and hand them to ib_unmap_fmr */ 307 list_for_each_entry(ibmr, list, unmap_list) { 308 if (ibmr->sg_dma_len) 309 ret |= rds_ib_post_inv(ibmr); 310 } 311 if (ret) 312 pr_warn("RDS/IB: %s failed (err=%d)\n", __func__, ret); 313 314 /* Now we can destroy the DMA mapping and unpin any pages */ 315 list_for_each_entry_safe(ibmr, next, list, unmap_list) { 316 *unpinned += ibmr->sg_len; 317 frmr = &ibmr->u.frmr; 318 __rds_ib_teardown_mr(ibmr); 319 if (freed < goal || frmr->fr_state == FRMR_IS_STALE) { 320 /* Don't de-allocate if the MR is not free yet */ 321 if (frmr->fr_state == FRMR_IS_INUSE) 322 continue; 323 324 if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL) 325 rds_ib_stats_inc(s_ib_rdma_mr_8k_free); 326 else 327 rds_ib_stats_inc(s_ib_rdma_mr_1m_free); 328 list_del(&ibmr->unmap_list); 329 if (frmr->mr) 330 ib_dereg_mr(frmr->mr); 331 kfree(ibmr); 332 freed++; 333 } 334 } 335 *nfreed = freed; 336 } 337 338 struct rds_ib_mr *rds_ib_reg_frmr(struct rds_ib_device *rds_ibdev, 339 struct rds_ib_connection *ic, 340 struct scatterlist *sg, 341 unsigned long nents, u32 *key) 342 { 343 struct rds_ib_mr *ibmr = NULL; 344 struct rds_ib_frmr *frmr; 345 int ret; 346 347 do { 348 if (ibmr) 349 rds_ib_free_frmr(ibmr, true); 350 ibmr = rds_ib_alloc_frmr(rds_ibdev, nents); 351 if (IS_ERR(ibmr)) 352 return ibmr; 353 frmr = &ibmr->u.frmr; 354 } while (frmr->fr_state != FRMR_IS_FREE); 355 356 ibmr->ic = ic; 357 ibmr->device = rds_ibdev; 358 ret = rds_ib_map_frmr(rds_ibdev, ibmr->pool, ibmr, sg, nents); 359 if (ret == 0) { 360 *key = frmr->mr->rkey; 361 } else { 362 rds_ib_free_frmr(ibmr, false); 363 ibmr = ERR_PTR(ret); 364 } 365 366 return ibmr; 367 } 368 369 void rds_ib_free_frmr_list(struct rds_ib_mr *ibmr) 370 { 371 struct rds_ib_mr_pool *pool = ibmr->pool; 372 struct rds_ib_frmr *frmr = &ibmr->u.frmr; 373 374 if (frmr->fr_state == FRMR_IS_STALE) 375 llist_add(&ibmr->llnode, &pool->drop_list); 376 else 377 llist_add(&ibmr->llnode, &pool->free_list); 378 } 379