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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
35static 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
79out_no_cigar:
80 kfree(ibmr);
81 atomic_dec(&pool->item_count);
82 return ERR_PTR(err);
83}
84
85static 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
102static 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;
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, 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 failed_wr = ®_wr.wr;
138 ret = ib_post_send(ibmr->ic->i_cm_id->qp, ®_wr.wr, &failed_wr);
139 WARN_ON(failed_wr != ®_wr.wr);
140 if (unlikely(ret)) {
141 /* Failure here can be because of -ENOMEM as well */
142 frmr->fr_state = FRMR_IS_STALE;
143 atomic_inc(&ibmr->ic->i_fastreg_wrs);
144 if (printk_ratelimit())
145 pr_warn("RDS/IB: %s returned error(%d)\n",
146 __func__, ret);
147 }
148 return ret;
149}
150
151static int rds_ib_map_frmr(struct rds_ib_device *rds_ibdev,
152 struct rds_ib_mr_pool *pool,
153 struct rds_ib_mr *ibmr,
154 struct scatterlist *sg, unsigned int sg_len)
155{
156 struct ib_device *dev = rds_ibdev->dev;
157 struct rds_ib_frmr *frmr = &ibmr->u.frmr;
158 int i;
159 u32 len;
160 int ret = 0;
161
162 /* We want to teardown old ibmr values here and fill it up with
163 * new sg values
164 */
165 rds_ib_teardown_mr(ibmr);
166
167 ibmr->sg = sg;
168 ibmr->sg_len = sg_len;
169 ibmr->sg_dma_len = 0;
170 frmr->sg_byte_len = 0;
171 WARN_ON(ibmr->sg_dma_len);
172 ibmr->sg_dma_len = ib_dma_map_sg(dev, ibmr->sg, ibmr->sg_len,
173 DMA_BIDIRECTIONAL);
174 if (unlikely(!ibmr->sg_dma_len)) {
175 pr_warn("RDS/IB: %s failed!\n", __func__);
176 return -EBUSY;
177 }
178
179 frmr->sg_byte_len = 0;
180 frmr->dma_npages = 0;
181 len = 0;
182
183 ret = -EINVAL;
184 for (i = 0; i < ibmr->sg_dma_len; ++i) {
185 unsigned int dma_len = ib_sg_dma_len(dev, &ibmr->sg[i]);
186 u64 dma_addr = ib_sg_dma_address(dev, &ibmr->sg[i]);
187
188 frmr->sg_byte_len += dma_len;
189 if (dma_addr & ~PAGE_MASK) {
190 if (i > 0)
191 goto out_unmap;
192 else
193 ++frmr->dma_npages;
194 }
195
196 if ((dma_addr + dma_len) & ~PAGE_MASK) {
197 if (i < ibmr->sg_dma_len - 1)
198 goto out_unmap;
199 else
200 ++frmr->dma_npages;
201 }
202
203 len += dma_len;
204 }
205 frmr->dma_npages += len >> PAGE_SHIFT;
206
207 if (frmr->dma_npages > ibmr->pool->fmr_attr.max_pages) {
208 ret = -EMSGSIZE;
209 goto out_unmap;
210 }
211
212 ret = rds_ib_post_reg_frmr(ibmr);
213 if (ret)
214 goto out_unmap;
215
216 if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL)
217 rds_ib_stats_inc(s_ib_rdma_mr_8k_used);
218 else
219 rds_ib_stats_inc(s_ib_rdma_mr_1m_used);
220
221 return ret;
222
223out_unmap:
224 ib_dma_unmap_sg(rds_ibdev->dev, ibmr->sg, ibmr->sg_len,
225 DMA_BIDIRECTIONAL);
226 ibmr->sg_dma_len = 0;
227 return ret;
228}
229
230static int rds_ib_post_inv(struct rds_ib_mr *ibmr)
231{
232 struct ib_send_wr *s_wr, *failed_wr;
233 struct rds_ib_frmr *frmr = &ibmr->u.frmr;
234 struct rdma_cm_id *i_cm_id = ibmr->ic->i_cm_id;
235 int ret = -EINVAL;
236
237 if (!i_cm_id || !i_cm_id->qp || !frmr->mr)
238 goto out;
239
240 if (frmr->fr_state != FRMR_IS_INUSE)
241 goto out;
242
243 while (atomic_dec_return(&ibmr->ic->i_fastreg_wrs) <= 0) {
244 atomic_inc(&ibmr->ic->i_fastreg_wrs);
245 cpu_relax();
246 }
247
248 frmr->fr_inv = true;
249 s_wr = &frmr->fr_wr;
250
251 memset(s_wr, 0, sizeof(*s_wr));
252 s_wr->wr_id = (unsigned long)(void *)ibmr;
253 s_wr->opcode = IB_WR_LOCAL_INV;
254 s_wr->ex.invalidate_rkey = frmr->mr->rkey;
255 s_wr->send_flags = IB_SEND_SIGNALED;
256
257 failed_wr = s_wr;
258 ret = ib_post_send(i_cm_id->qp, s_wr, &failed_wr);
259 WARN_ON(failed_wr != s_wr);
260 if (unlikely(ret)) {
261 frmr->fr_state = FRMR_IS_STALE;
262 frmr->fr_inv = false;
263 atomic_inc(&ibmr->ic->i_fastreg_wrs);
264 pr_err("RDS/IB: %s returned error(%d)\n", __func__, ret);
265 goto out;
266 }
267out:
268 return ret;
269}
270
271void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc)
272{
273 struct rds_ib_mr *ibmr = (void *)(unsigned long)wc->wr_id;
274 struct rds_ib_frmr *frmr = &ibmr->u.frmr;
275
276 if (wc->status != IB_WC_SUCCESS) {
277 frmr->fr_state = FRMR_IS_STALE;
278 if (rds_conn_up(ic->conn))
279 rds_ib_conn_error(ic->conn,
280 "frmr completion <%pI4,%pI4> status %u(%s), vendor_err 0x%x, disconnecting and reconnecting\n",
281 &ic->conn->c_laddr,
282 &ic->conn->c_faddr,
283 wc->status,
284 ib_wc_status_msg(wc->status),
285 wc->vendor_err);
286 }
287
288 if (frmr->fr_inv) {
289 frmr->fr_state = FRMR_IS_FREE;
290 frmr->fr_inv = false;
291 }
292
293 atomic_inc(&ic->i_fastreg_wrs);
294}
295
296void rds_ib_unreg_frmr(struct list_head *list, unsigned int *nfreed,
297 unsigned long *unpinned, unsigned int goal)
298{
299 struct rds_ib_mr *ibmr, *next;
300 struct rds_ib_frmr *frmr;
301 int ret = 0;
302 unsigned int freed = *nfreed;
303
304 /* String all ib_mr's onto one list and hand them to ib_unmap_fmr */
305 list_for_each_entry(ibmr, list, unmap_list) {
306 if (ibmr->sg_dma_len)
307 ret |= rds_ib_post_inv(ibmr);
308 }
309 if (ret)
310 pr_warn("RDS/IB: %s failed (err=%d)\n", __func__, ret);
311
312 /* Now we can destroy the DMA mapping and unpin any pages */
313 list_for_each_entry_safe(ibmr, next, list, unmap_list) {
314 *unpinned += ibmr->sg_len;
315 frmr = &ibmr->u.frmr;
316 __rds_ib_teardown_mr(ibmr);
317 if (freed < goal || frmr->fr_state == FRMR_IS_STALE) {
318 /* Don't de-allocate if the MR is not free yet */
319 if (frmr->fr_state == FRMR_IS_INUSE)
320 continue;
321
322 if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL)
323 rds_ib_stats_inc(s_ib_rdma_mr_8k_free);
324 else
325 rds_ib_stats_inc(s_ib_rdma_mr_1m_free);
326 list_del(&ibmr->unmap_list);
327 if (frmr->mr)
328 ib_dereg_mr(frmr->mr);
329 kfree(ibmr);
330 freed++;
331 }
332 }
333 *nfreed = freed;
334}
335
336struct rds_ib_mr *rds_ib_reg_frmr(struct rds_ib_device *rds_ibdev,
337 struct rds_ib_connection *ic,
338 struct scatterlist *sg,
339 unsigned long nents, u32 *key)
340{
341 struct rds_ib_mr *ibmr = NULL;
342 struct rds_ib_frmr *frmr;
343 int ret;
344
345 do {
346 if (ibmr)
347 rds_ib_free_frmr(ibmr, true);
348 ibmr = rds_ib_alloc_frmr(rds_ibdev, nents);
349 if (IS_ERR(ibmr))
350 return ibmr;
351 frmr = &ibmr->u.frmr;
352 } while (frmr->fr_state != FRMR_IS_FREE);
353
354 ibmr->ic = ic;
355 ibmr->device = rds_ibdev;
356 ret = rds_ib_map_frmr(rds_ibdev, ibmr->pool, ibmr, sg, nents);
357 if (ret == 0) {
358 *key = frmr->mr->rkey;
359 } else {
360 rds_ib_free_frmr(ibmr, false);
361 ibmr = ERR_PTR(ret);
362 }
363
364 return ibmr;
365}
366
367void rds_ib_free_frmr_list(struct rds_ib_mr *ibmr)
368{
369 struct rds_ib_mr_pool *pool = ibmr->pool;
370 struct rds_ib_frmr *frmr = &ibmr->u.frmr;
371
372 if (frmr->fr_state == FRMR_IS_STALE)
373 llist_add(&ibmr->llnode, &pool->drop_list);
374 else
375 llist_add(&ibmr->llnode, &pool->free_list);
376}