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_reg_wr reg_wr; 106 int ret, off = 0; 107 108 while (atomic_dec_return(&ibmr->ic->i_fastreg_wrs) <= 0) { 109 atomic_inc(&ibmr->ic->i_fastreg_wrs); 110 cpu_relax(); 111 } 112 113 ret = ib_map_mr_sg_zbva(frmr->mr, ibmr->sg, ibmr->sg_len, 114 &off, PAGE_SIZE); 115 if (unlikely(ret != ibmr->sg_len)) 116 return ret < 0 ? ret : -EINVAL; 117 118 /* Perform a WR for the fast_reg_mr. Each individual page 119 * in the sg list is added to the fast reg page list and placed 120 * inside the fast_reg_mr WR. The key used is a rolling 8bit 121 * counter, which should guarantee uniqueness. 122 */ 123 ib_update_fast_reg_key(frmr->mr, ibmr->remap_count++); 124 frmr->fr_state = FRMR_IS_INUSE; 125 126 memset(®_wr, 0, sizeof(reg_wr)); 127 reg_wr.wr.wr_id = (unsigned long)(void *)ibmr; 128 reg_wr.wr.opcode = IB_WR_REG_MR; 129 reg_wr.wr.num_sge = 0; 130 reg_wr.mr = frmr->mr; 131 reg_wr.key = frmr->mr->rkey; 132 reg_wr.access = IB_ACCESS_LOCAL_WRITE | 133 IB_ACCESS_REMOTE_READ | 134 IB_ACCESS_REMOTE_WRITE; 135 reg_wr.wr.send_flags = IB_SEND_SIGNALED; 136 137 ret = ib_post_send(ibmr->ic->i_cm_id->qp, ®_wr.wr, NULL); 138 if (unlikely(ret)) { 139 /* Failure here can be because of -ENOMEM as well */ 140 frmr->fr_state = FRMR_IS_STALE; 141 atomic_inc(&ibmr->ic->i_fastreg_wrs); 142 if (printk_ratelimit()) 143 pr_warn("RDS/IB: %s returned error(%d)\n", 144 __func__, ret); 145 } 146 return ret; 147 } 148 149 static int rds_ib_map_frmr(struct rds_ib_device *rds_ibdev, 150 struct rds_ib_mr_pool *pool, 151 struct rds_ib_mr *ibmr, 152 struct scatterlist *sg, unsigned int sg_len) 153 { 154 struct ib_device *dev = rds_ibdev->dev; 155 struct rds_ib_frmr *frmr = &ibmr->u.frmr; 156 int i; 157 u32 len; 158 int ret = 0; 159 160 /* We want to teardown old ibmr values here and fill it up with 161 * new sg values 162 */ 163 rds_ib_teardown_mr(ibmr); 164 165 ibmr->sg = sg; 166 ibmr->sg_len = sg_len; 167 ibmr->sg_dma_len = 0; 168 frmr->sg_byte_len = 0; 169 WARN_ON(ibmr->sg_dma_len); 170 ibmr->sg_dma_len = ib_dma_map_sg(dev, ibmr->sg, ibmr->sg_len, 171 DMA_BIDIRECTIONAL); 172 if (unlikely(!ibmr->sg_dma_len)) { 173 pr_warn("RDS/IB: %s failed!\n", __func__); 174 return -EBUSY; 175 } 176 177 frmr->sg_byte_len = 0; 178 frmr->dma_npages = 0; 179 len = 0; 180 181 ret = -EINVAL; 182 for (i = 0; i < ibmr->sg_dma_len; ++i) { 183 unsigned int dma_len = ib_sg_dma_len(dev, &ibmr->sg[i]); 184 u64 dma_addr = ib_sg_dma_address(dev, &ibmr->sg[i]); 185 186 frmr->sg_byte_len += dma_len; 187 if (dma_addr & ~PAGE_MASK) { 188 if (i > 0) 189 goto out_unmap; 190 else 191 ++frmr->dma_npages; 192 } 193 194 if ((dma_addr + dma_len) & ~PAGE_MASK) { 195 if (i < ibmr->sg_dma_len - 1) 196 goto out_unmap; 197 else 198 ++frmr->dma_npages; 199 } 200 201 len += dma_len; 202 } 203 frmr->dma_npages += len >> PAGE_SHIFT; 204 205 if (frmr->dma_npages > ibmr->pool->fmr_attr.max_pages) { 206 ret = -EMSGSIZE; 207 goto out_unmap; 208 } 209 210 ret = rds_ib_post_reg_frmr(ibmr); 211 if (ret) 212 goto out_unmap; 213 214 if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL) 215 rds_ib_stats_inc(s_ib_rdma_mr_8k_used); 216 else 217 rds_ib_stats_inc(s_ib_rdma_mr_1m_used); 218 219 return ret; 220 221 out_unmap: 222 ib_dma_unmap_sg(rds_ibdev->dev, ibmr->sg, ibmr->sg_len, 223 DMA_BIDIRECTIONAL); 224 ibmr->sg_dma_len = 0; 225 return ret; 226 } 227 228 static int rds_ib_post_inv(struct rds_ib_mr *ibmr) 229 { 230 struct ib_send_wr *s_wr; 231 struct rds_ib_frmr *frmr = &ibmr->u.frmr; 232 struct rdma_cm_id *i_cm_id = ibmr->ic->i_cm_id; 233 int ret = -EINVAL; 234 235 if (!i_cm_id || !i_cm_id->qp || !frmr->mr) 236 goto out; 237 238 if (frmr->fr_state != FRMR_IS_INUSE) 239 goto out; 240 241 while (atomic_dec_return(&ibmr->ic->i_fastunreg_wrs) <= 0) { 242 atomic_inc(&ibmr->ic->i_fastunreg_wrs); 243 cpu_relax(); 244 } 245 246 frmr->fr_inv = true; 247 s_wr = &frmr->fr_wr; 248 249 memset(s_wr, 0, sizeof(*s_wr)); 250 s_wr->wr_id = (unsigned long)(void *)ibmr; 251 s_wr->opcode = IB_WR_LOCAL_INV; 252 s_wr->ex.invalidate_rkey = frmr->mr->rkey; 253 s_wr->send_flags = IB_SEND_SIGNALED; 254 255 ret = ib_post_send(i_cm_id->qp, s_wr, NULL); 256 if (unlikely(ret)) { 257 frmr->fr_state = FRMR_IS_STALE; 258 frmr->fr_inv = false; 259 atomic_inc(&ibmr->ic->i_fastunreg_wrs); 260 pr_err("RDS/IB: %s returned error(%d)\n", __func__, ret); 261 goto out; 262 } 263 out: 264 return ret; 265 } 266 267 void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc) 268 { 269 struct rds_ib_mr *ibmr = (void *)(unsigned long)wc->wr_id; 270 struct rds_ib_frmr *frmr = &ibmr->u.frmr; 271 272 if (wc->status != IB_WC_SUCCESS) { 273 frmr->fr_state = FRMR_IS_STALE; 274 if (rds_conn_up(ic->conn)) 275 rds_ib_conn_error(ic->conn, 276 "frmr completion <%pI4,%pI4> status %u(%s), vendor_err 0x%x, disconnecting and reconnecting\n", 277 &ic->conn->c_laddr, 278 &ic->conn->c_faddr, 279 wc->status, 280 ib_wc_status_msg(wc->status), 281 wc->vendor_err); 282 } 283 284 if (frmr->fr_inv) { 285 frmr->fr_state = FRMR_IS_FREE; 286 frmr->fr_inv = false; 287 atomic_inc(&ic->i_fastreg_wrs); 288 } else { 289 atomic_inc(&ic->i_fastunreg_wrs); 290 } 291 } 292 293 void rds_ib_unreg_frmr(struct list_head *list, unsigned int *nfreed, 294 unsigned long *unpinned, unsigned int goal) 295 { 296 struct rds_ib_mr *ibmr, *next; 297 struct rds_ib_frmr *frmr; 298 int ret = 0; 299 unsigned int freed = *nfreed; 300 301 /* String all ib_mr's onto one list and hand them to ib_unmap_fmr */ 302 list_for_each_entry(ibmr, list, unmap_list) { 303 if (ibmr->sg_dma_len) 304 ret |= rds_ib_post_inv(ibmr); 305 } 306 if (ret) 307 pr_warn("RDS/IB: %s failed (err=%d)\n", __func__, ret); 308 309 /* Now we can destroy the DMA mapping and unpin any pages */ 310 list_for_each_entry_safe(ibmr, next, list, unmap_list) { 311 *unpinned += ibmr->sg_len; 312 frmr = &ibmr->u.frmr; 313 __rds_ib_teardown_mr(ibmr); 314 if (freed < goal || frmr->fr_state == FRMR_IS_STALE) { 315 /* Don't de-allocate if the MR is not free yet */ 316 if (frmr->fr_state == FRMR_IS_INUSE) 317 continue; 318 319 if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL) 320 rds_ib_stats_inc(s_ib_rdma_mr_8k_free); 321 else 322 rds_ib_stats_inc(s_ib_rdma_mr_1m_free); 323 list_del(&ibmr->unmap_list); 324 if (frmr->mr) 325 ib_dereg_mr(frmr->mr); 326 kfree(ibmr); 327 freed++; 328 } 329 } 330 *nfreed = freed; 331 } 332 333 struct rds_ib_mr *rds_ib_reg_frmr(struct rds_ib_device *rds_ibdev, 334 struct rds_ib_connection *ic, 335 struct scatterlist *sg, 336 unsigned long nents, u32 *key) 337 { 338 struct rds_ib_mr *ibmr = NULL; 339 struct rds_ib_frmr *frmr; 340 int ret; 341 342 if (!ic) { 343 /* TODO: Add FRWR support for RDS_GET_MR using proxy qp*/ 344 return ERR_PTR(-EOPNOTSUPP); 345 } 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