• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 
rds_ib_alloc_fmr(struct rds_ib_device * rds_ibdev,int npages)35 struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *rds_ibdev, int npages)
36 {
37 	struct rds_ib_mr_pool *pool;
38 	struct rds_ib_mr *ibmr = NULL;
39 	struct rds_ib_fmr *fmr;
40 	int err = 0;
41 
42 	if (npages <= RDS_MR_8K_MSG_SIZE)
43 		pool = rds_ibdev->mr_8k_pool;
44 	else
45 		pool = rds_ibdev->mr_1m_pool;
46 
47 	if (atomic_read(&pool->dirty_count) >= pool->max_items / 10)
48 		queue_delayed_work(rds_ib_mr_wq, &pool->flush_worker, 10);
49 
50 	/* Switch pools if one of the pool is reaching upper limit */
51 	if (atomic_read(&pool->dirty_count) >=  pool->max_items * 9 / 10) {
52 		if (pool->pool_type == RDS_IB_MR_8K_POOL)
53 			pool = rds_ibdev->mr_1m_pool;
54 		else
55 			pool = rds_ibdev->mr_8k_pool;
56 	}
57 
58 	ibmr = rds_ib_try_reuse_ibmr(pool);
59 	if (ibmr)
60 		return ibmr;
61 
62 	ibmr = kzalloc_node(sizeof(*ibmr), GFP_KERNEL,
63 			    rdsibdev_to_node(rds_ibdev));
64 	if (!ibmr) {
65 		err = -ENOMEM;
66 		goto out_no_cigar;
67 	}
68 
69 	fmr = &ibmr->u.fmr;
70 	fmr->fmr = ib_alloc_fmr(rds_ibdev->pd,
71 			(IB_ACCESS_LOCAL_WRITE |
72 			 IB_ACCESS_REMOTE_READ |
73 			 IB_ACCESS_REMOTE_WRITE |
74 			 IB_ACCESS_REMOTE_ATOMIC),
75 			&pool->fmr_attr);
76 	if (IS_ERR(fmr->fmr)) {
77 		err = PTR_ERR(fmr->fmr);
78 		fmr->fmr = NULL;
79 		pr_warn("RDS/IB: %s failed (err=%d)\n", __func__, err);
80 		goto out_no_cigar;
81 	}
82 
83 	ibmr->pool = pool;
84 	if (pool->pool_type == RDS_IB_MR_8K_POOL)
85 		rds_ib_stats_inc(s_ib_rdma_mr_8k_alloc);
86 	else
87 		rds_ib_stats_inc(s_ib_rdma_mr_1m_alloc);
88 
89 	return ibmr;
90 
91 out_no_cigar:
92 	kfree(ibmr);
93 	atomic_dec(&pool->item_count);
94 
95 	return ERR_PTR(err);
96 }
97 
rds_ib_map_fmr(struct rds_ib_device * rds_ibdev,struct rds_ib_mr * ibmr,struct scatterlist * sg,unsigned int nents)98 static int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev,
99 			  struct rds_ib_mr *ibmr, struct scatterlist *sg,
100 			  unsigned int nents)
101 {
102 	struct ib_device *dev = rds_ibdev->dev;
103 	struct rds_ib_fmr *fmr = &ibmr->u.fmr;
104 	struct scatterlist *scat = sg;
105 	u64 io_addr = 0;
106 	u64 *dma_pages;
107 	u32 len;
108 	int page_cnt, sg_dma_len;
109 	int i, j;
110 	int ret;
111 
112 	sg_dma_len = ib_dma_map_sg(dev, sg, nents, DMA_BIDIRECTIONAL);
113 	if (unlikely(!sg_dma_len)) {
114 		pr_warn("RDS/IB: %s failed!\n", __func__);
115 		return -EBUSY;
116 	}
117 
118 	len = 0;
119 	page_cnt = 0;
120 
121 	for (i = 0; i < sg_dma_len; ++i) {
122 		unsigned int dma_len = sg_dma_len(&scat[i]);
123 		u64 dma_addr = sg_dma_address(&scat[i]);
124 
125 		if (dma_addr & ~PAGE_MASK) {
126 			if (i > 0) {
127 				ib_dma_unmap_sg(dev, sg, nents,
128 						DMA_BIDIRECTIONAL);
129 				return -EINVAL;
130 			} else {
131 				++page_cnt;
132 			}
133 		}
134 		if ((dma_addr + dma_len) & ~PAGE_MASK) {
135 			if (i < sg_dma_len - 1) {
136 				ib_dma_unmap_sg(dev, sg, nents,
137 						DMA_BIDIRECTIONAL);
138 				return -EINVAL;
139 			} else {
140 				++page_cnt;
141 			}
142 		}
143 
144 		len += dma_len;
145 	}
146 
147 	page_cnt += len >> PAGE_SHIFT;
148 	if (page_cnt > ibmr->pool->fmr_attr.max_pages) {
149 		ib_dma_unmap_sg(dev, sg, nents, DMA_BIDIRECTIONAL);
150 		return -EINVAL;
151 	}
152 
153 	dma_pages = kmalloc_array_node(sizeof(u64), page_cnt, GFP_ATOMIC,
154 				       rdsibdev_to_node(rds_ibdev));
155 	if (!dma_pages) {
156 		ib_dma_unmap_sg(dev, sg, nents, DMA_BIDIRECTIONAL);
157 		return -ENOMEM;
158 	}
159 
160 	page_cnt = 0;
161 	for (i = 0; i < sg_dma_len; ++i) {
162 		unsigned int dma_len = sg_dma_len(&scat[i]);
163 		u64 dma_addr = sg_dma_address(&scat[i]);
164 
165 		for (j = 0; j < dma_len; j += PAGE_SIZE)
166 			dma_pages[page_cnt++] =
167 				(dma_addr & PAGE_MASK) + j;
168 	}
169 
170 	ret = ib_map_phys_fmr(fmr->fmr, dma_pages, page_cnt, io_addr);
171 	if (ret) {
172 		ib_dma_unmap_sg(dev, sg, nents, DMA_BIDIRECTIONAL);
173 		goto out;
174 	}
175 
176 	/* Success - we successfully remapped the MR, so we can
177 	 * safely tear down the old mapping.
178 	 */
179 	rds_ib_teardown_mr(ibmr);
180 
181 	ibmr->sg = scat;
182 	ibmr->sg_len = nents;
183 	ibmr->sg_dma_len = sg_dma_len;
184 	ibmr->remap_count++;
185 
186 	if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL)
187 		rds_ib_stats_inc(s_ib_rdma_mr_8k_used);
188 	else
189 		rds_ib_stats_inc(s_ib_rdma_mr_1m_used);
190 	ret = 0;
191 
192 out:
193 	kfree(dma_pages);
194 
195 	return ret;
196 }
197 
rds_ib_reg_fmr(struct rds_ib_device * rds_ibdev,struct scatterlist * sg,unsigned long nents,u32 * key)198 struct rds_ib_mr *rds_ib_reg_fmr(struct rds_ib_device *rds_ibdev,
199 				 struct scatterlist *sg,
200 				 unsigned long nents,
201 				 u32 *key)
202 {
203 	struct rds_ib_mr *ibmr = NULL;
204 	struct rds_ib_fmr *fmr;
205 	int ret;
206 
207 	ibmr = rds_ib_alloc_fmr(rds_ibdev, nents);
208 	if (IS_ERR(ibmr))
209 		return ibmr;
210 
211 	ibmr->device = rds_ibdev;
212 	fmr = &ibmr->u.fmr;
213 	ret = rds_ib_map_fmr(rds_ibdev, ibmr, sg, nents);
214 	if (ret == 0)
215 		*key = fmr->fmr->rkey;
216 	else
217 		rds_ib_free_mr(ibmr, 0);
218 
219 	return ibmr;
220 }
221 
rds_ib_unreg_fmr(struct list_head * list,unsigned int * nfreed,unsigned long * unpinned,unsigned int goal)222 void rds_ib_unreg_fmr(struct list_head *list, unsigned int *nfreed,
223 		      unsigned long *unpinned, unsigned int goal)
224 {
225 	struct rds_ib_mr *ibmr, *next;
226 	struct rds_ib_fmr *fmr;
227 	LIST_HEAD(fmr_list);
228 	int ret = 0;
229 	unsigned int freed = *nfreed;
230 
231 	/* String all ib_mr's onto one list and hand them to  ib_unmap_fmr */
232 	list_for_each_entry(ibmr, list, unmap_list) {
233 		fmr = &ibmr->u.fmr;
234 		list_add(&fmr->fmr->list, &fmr_list);
235 	}
236 
237 	ret = ib_unmap_fmr(&fmr_list);
238 	if (ret)
239 		pr_warn("RDS/IB: FMR invalidation failed (err=%d)\n", ret);
240 
241 	/* Now we can destroy the DMA mapping and unpin any pages */
242 	list_for_each_entry_safe(ibmr, next, list, unmap_list) {
243 		fmr = &ibmr->u.fmr;
244 		*unpinned += ibmr->sg_len;
245 		__rds_ib_teardown_mr(ibmr);
246 		if (freed < goal ||
247 		    ibmr->remap_count >= ibmr->pool->fmr_attr.max_maps) {
248 			if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL)
249 				rds_ib_stats_inc(s_ib_rdma_mr_8k_free);
250 			else
251 				rds_ib_stats_inc(s_ib_rdma_mr_1m_free);
252 			list_del(&ibmr->unmap_list);
253 			ib_dealloc_fmr(fmr->fmr);
254 			kfree(ibmr);
255 			freed++;
256 		}
257 	}
258 	*nfreed = freed;
259 }
260 
rds_ib_free_fmr_list(struct rds_ib_mr * ibmr)261 void rds_ib_free_fmr_list(struct rds_ib_mr *ibmr)
262 {
263 	struct rds_ib_mr_pool *pool = ibmr->pool;
264 
265 	if (ibmr->remap_count >= pool->fmr_attr.max_maps)
266 		llist_add(&ibmr->llnode, &pool->drop_list);
267 	else
268 		llist_add(&ibmr->llnode, &pool->free_list);
269 }
270