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 err = PTR_ERR(frmr->mr); 65 goto out_no_cigar; 66 } 67 68 ibmr->pool = pool; 69 if (pool->pool_type == RDS_IB_MR_8K_POOL) 70 rds_ib_stats_inc(s_ib_rdma_mr_8k_alloc); 71 else 72 rds_ib_stats_inc(s_ib_rdma_mr_1m_alloc); 73 74 if (atomic_read(&pool->item_count) > pool->max_items_soft) 75 pool->max_items_soft = pool->max_items; 76 77 frmr->fr_state = FRMR_IS_FREE; 78 return ibmr; 79 80 out_no_cigar: 81 kfree(ibmr); 82 atomic_dec(&pool->item_count); 83 return ERR_PTR(err); 84 } 85 86 static void rds_ib_free_frmr(struct rds_ib_mr *ibmr, bool drop) 87 { 88 struct rds_ib_mr_pool *pool = ibmr->pool; 89 90 if (drop) 91 llist_add(&ibmr->llnode, &pool->drop_list); 92 else 93 llist_add(&ibmr->llnode, &pool->free_list); 94 atomic_add(ibmr->sg_len, &pool->free_pinned); 95 atomic_inc(&pool->dirty_count); 96 97 /* If we've pinned too many pages, request a flush */ 98 if (atomic_read(&pool->free_pinned) >= pool->max_free_pinned || 99 atomic_read(&pool->dirty_count) >= pool->max_items / 5) 100 queue_delayed_work(rds_ib_mr_wq, &pool->flush_worker, 10); 101 } 102 103 static int rds_ib_post_reg_frmr(struct rds_ib_mr *ibmr) 104 { 105 struct rds_ib_frmr *frmr = &ibmr->u.frmr; 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 ret = ib_post_send(ibmr->ic->i_cm_id->qp, ®_wr.wr, NULL); 139 if (unlikely(ret)) { 140 /* Failure here can be because of -ENOMEM as well */ 141 frmr->fr_state = FRMR_IS_STALE; 142 atomic_inc(&ibmr->ic->i_fastreg_wrs); 143 if (printk_ratelimit()) 144 pr_warn("RDS/IB: %s returned error(%d)\n", 145 __func__, ret); 146 } 147 return ret; 148 } 149 150 static int rds_ib_map_frmr(struct rds_ib_device *rds_ibdev, 151 struct rds_ib_mr_pool *pool, 152 struct rds_ib_mr *ibmr, 153 struct scatterlist *sg, unsigned int sg_len) 154 { 155 struct ib_device *dev = rds_ibdev->dev; 156 struct rds_ib_frmr *frmr = &ibmr->u.frmr; 157 int i; 158 u32 len; 159 int ret = 0; 160 161 /* We want to teardown old ibmr values here and fill it up with 162 * new sg values 163 */ 164 rds_ib_teardown_mr(ibmr); 165 166 ibmr->sg = sg; 167 ibmr->sg_len = sg_len; 168 ibmr->sg_dma_len = 0; 169 frmr->sg_byte_len = 0; 170 WARN_ON(ibmr->sg_dma_len); 171 ibmr->sg_dma_len = ib_dma_map_sg(dev, ibmr->sg, ibmr->sg_len, 172 DMA_BIDIRECTIONAL); 173 if (unlikely(!ibmr->sg_dma_len)) { 174 pr_warn("RDS/IB: %s failed!\n", __func__); 175 return -EBUSY; 176 } 177 178 frmr->sg_byte_len = 0; 179 frmr->dma_npages = 0; 180 len = 0; 181 182 ret = -EINVAL; 183 for (i = 0; i < ibmr->sg_dma_len; ++i) { 184 unsigned int dma_len = sg_dma_len(&ibmr->sg[i]); 185 u64 dma_addr = sg_dma_address(&ibmr->sg[i]); 186 187 frmr->sg_byte_len += dma_len; 188 if (dma_addr & ~PAGE_MASK) { 189 if (i > 0) 190 goto out_unmap; 191 else 192 ++frmr->dma_npages; 193 } 194 195 if ((dma_addr + dma_len) & ~PAGE_MASK) { 196 if (i < ibmr->sg_dma_len - 1) 197 goto out_unmap; 198 else 199 ++frmr->dma_npages; 200 } 201 202 len += dma_len; 203 } 204 frmr->dma_npages += len >> PAGE_SHIFT; 205 206 if (frmr->dma_npages > ibmr->pool->fmr_attr.max_pages) { 207 ret = -EMSGSIZE; 208 goto out_unmap; 209 } 210 211 ret = rds_ib_post_reg_frmr(ibmr); 212 if (ret) 213 goto out_unmap; 214 215 if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL) 216 rds_ib_stats_inc(s_ib_rdma_mr_8k_used); 217 else 218 rds_ib_stats_inc(s_ib_rdma_mr_1m_used); 219 220 return ret; 221 222 out_unmap: 223 ib_dma_unmap_sg(rds_ibdev->dev, ibmr->sg, ibmr->sg_len, 224 DMA_BIDIRECTIONAL); 225 ibmr->sg_dma_len = 0; 226 return ret; 227 } 228 229 static int rds_ib_post_inv(struct rds_ib_mr *ibmr) 230 { 231 struct ib_send_wr *s_wr; 232 struct rds_ib_frmr *frmr = &ibmr->u.frmr; 233 struct rdma_cm_id *i_cm_id = ibmr->ic->i_cm_id; 234 int ret = -EINVAL; 235 236 if (!i_cm_id || !i_cm_id->qp || !frmr->mr) 237 goto out; 238 239 if (frmr->fr_state != FRMR_IS_INUSE) 240 goto out; 241 242 while (atomic_dec_return(&ibmr->ic->i_fastunreg_wrs) <= 0) { 243 atomic_inc(&ibmr->ic->i_fastunreg_wrs); 244 cpu_relax(); 245 } 246 247 frmr->fr_inv = true; 248 s_wr = &frmr->fr_wr; 249 250 memset(s_wr, 0, sizeof(*s_wr)); 251 s_wr->wr_id = (unsigned long)(void *)ibmr; 252 s_wr->opcode = IB_WR_LOCAL_INV; 253 s_wr->ex.invalidate_rkey = frmr->mr->rkey; 254 s_wr->send_flags = IB_SEND_SIGNALED; 255 256 ret = ib_post_send(i_cm_id->qp, s_wr, NULL); 257 if (unlikely(ret)) { 258 frmr->fr_state = FRMR_IS_STALE; 259 frmr->fr_inv = false; 260 atomic_inc(&ibmr->ic->i_fastunreg_wrs); 261 pr_err("RDS/IB: %s returned error(%d)\n", __func__, ret); 262 goto out; 263 } 264 out: 265 return ret; 266 } 267 268 void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc) 269 { 270 struct rds_ib_mr *ibmr = (void *)(unsigned long)wc->wr_id; 271 struct rds_ib_frmr *frmr = &ibmr->u.frmr; 272 273 if (wc->status != IB_WC_SUCCESS) { 274 frmr->fr_state = FRMR_IS_STALE; 275 if (rds_conn_up(ic->conn)) 276 rds_ib_conn_error(ic->conn, 277 "frmr completion <%pI4,%pI4> status %u(%s), vendor_err 0x%x, disconnecting and reconnecting\n", 278 &ic->conn->c_laddr, 279 &ic->conn->c_faddr, 280 wc->status, 281 ib_wc_status_msg(wc->status), 282 wc->vendor_err); 283 } 284 285 if (frmr->fr_inv) { 286 frmr->fr_state = FRMR_IS_FREE; 287 frmr->fr_inv = false; 288 atomic_inc(&ic->i_fastreg_wrs); 289 } else { 290 atomic_inc(&ic->i_fastunreg_wrs); 291 } 292 } 293 294 void rds_ib_unreg_frmr(struct list_head *list, unsigned int *nfreed, 295 unsigned long *unpinned, unsigned int goal) 296 { 297 struct rds_ib_mr *ibmr, *next; 298 struct rds_ib_frmr *frmr; 299 int ret = 0; 300 unsigned int freed = *nfreed; 301 302 /* String all ib_mr's onto one list and hand them to ib_unmap_fmr */ 303 list_for_each_entry(ibmr, list, unmap_list) { 304 if (ibmr->sg_dma_len) 305 ret |= rds_ib_post_inv(ibmr); 306 } 307 if (ret) 308 pr_warn("RDS/IB: %s failed (err=%d)\n", __func__, ret); 309 310 /* Now we can destroy the DMA mapping and unpin any pages */ 311 list_for_each_entry_safe(ibmr, next, list, unmap_list) { 312 *unpinned += ibmr->sg_len; 313 frmr = &ibmr->u.frmr; 314 __rds_ib_teardown_mr(ibmr); 315 if (freed < goal || frmr->fr_state == FRMR_IS_STALE) { 316 /* Don't de-allocate if the MR is not free yet */ 317 if (frmr->fr_state == FRMR_IS_INUSE) 318 continue; 319 320 if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL) 321 rds_ib_stats_inc(s_ib_rdma_mr_8k_free); 322 else 323 rds_ib_stats_inc(s_ib_rdma_mr_1m_free); 324 list_del(&ibmr->unmap_list); 325 if (frmr->mr) 326 ib_dereg_mr(frmr->mr); 327 kfree(ibmr); 328 freed++; 329 } 330 } 331 *nfreed = freed; 332 } 333 334 struct rds_ib_mr *rds_ib_reg_frmr(struct rds_ib_device *rds_ibdev, 335 struct rds_ib_connection *ic, 336 struct scatterlist *sg, 337 unsigned long nents, u32 *key) 338 { 339 struct rds_ib_mr *ibmr = NULL; 340 struct rds_ib_frmr *frmr; 341 int ret; 342 343 if (!ic) { 344 /* TODO: Add FRWR support for RDS_GET_MR using proxy qp*/ 345 return ERR_PTR(-EOPNOTSUPP); 346 } 347 348 do { 349 if (ibmr) 350 rds_ib_free_frmr(ibmr, true); 351 ibmr = rds_ib_alloc_frmr(rds_ibdev, nents); 352 if (IS_ERR(ibmr)) 353 return ibmr; 354 frmr = &ibmr->u.frmr; 355 } while (frmr->fr_state != FRMR_IS_FREE); 356 357 ibmr->ic = ic; 358 ibmr->device = rds_ibdev; 359 ret = rds_ib_map_frmr(rds_ibdev, ibmr->pool, ibmr, sg, nents); 360 if (ret == 0) { 361 *key = frmr->mr->rkey; 362 } else { 363 rds_ib_free_frmr(ibmr, false); 364 ibmr = ERR_PTR(ret); 365 } 366 367 return ibmr; 368 } 369 370 void rds_ib_free_frmr_list(struct rds_ib_mr *ibmr) 371 { 372 struct rds_ib_mr_pool *pool = ibmr->pool; 373 struct rds_ib_frmr *frmr = &ibmr->u.frmr; 374 375 if (frmr->fr_state == FRMR_IS_STALE) 376 llist_add(&ibmr->llnode, &pool->drop_list); 377 else 378 llist_add(&ibmr->llnode, &pool->free_list); 379 } 380