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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, 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
152static 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
224out_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
231static 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 }
268out:
269 return ret;
270}
271
272void 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
298void 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
338struct 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
369void 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}