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