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1/*
2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33#include <linux/kernel.h>
34#include <linux/slab.h>
35#include <linux/mm.h>
36#include <linux/highmem.h>
37#include <linux/scatterlist.h>
38
39#include "iscsi_iser.h"
40
41void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc)
42{
43 iser_err_comp(wc, "memreg");
44}
45
46static struct iser_fr_desc *iser_reg_desc_get_fr(struct ib_conn *ib_conn)
47{
48 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
49 struct iser_fr_desc *desc;
50 unsigned long flags;
51
52 spin_lock_irqsave(&fr_pool->lock, flags);
53 desc = list_first_entry(&fr_pool->list,
54 struct iser_fr_desc, list);
55 list_del(&desc->list);
56 spin_unlock_irqrestore(&fr_pool->lock, flags);
57
58 return desc;
59}
60
61static void iser_reg_desc_put_fr(struct ib_conn *ib_conn,
62 struct iser_fr_desc *desc)
63{
64 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
65 unsigned long flags;
66
67 spin_lock_irqsave(&fr_pool->lock, flags);
68 list_add(&desc->list, &fr_pool->list);
69 spin_unlock_irqrestore(&fr_pool->lock, flags);
70}
71
72int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
73 enum iser_data_dir iser_dir,
74 enum dma_data_direction dma_dir)
75{
76 struct iser_data_buf *data = &iser_task->data[iser_dir];
77 struct ib_device *dev;
78
79 iser_task->dir[iser_dir] = 1;
80 dev = iser_task->iser_conn->ib_conn.device->ib_device;
81
82 data->dma_nents = ib_dma_map_sg(dev, data->sg, data->size, dma_dir);
83 if (unlikely(data->dma_nents == 0)) {
84 iser_err("dma_map_sg failed!!!\n");
85 return -EINVAL;
86 }
87
88 if (scsi_prot_sg_count(iser_task->sc)) {
89 struct iser_data_buf *pdata = &iser_task->prot[iser_dir];
90
91 pdata->dma_nents = ib_dma_map_sg(dev, pdata->sg, pdata->size, dma_dir);
92 if (unlikely(pdata->dma_nents == 0)) {
93 iser_err("protection dma_map_sg failed!!!\n");
94 goto out_unmap;
95 }
96 }
97
98 return 0;
99
100out_unmap:
101 ib_dma_unmap_sg(dev, data->sg, data->size, dma_dir);
102 return -EINVAL;
103}
104
105
106void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
107 enum iser_data_dir iser_dir,
108 enum dma_data_direction dma_dir)
109{
110 struct iser_data_buf *data = &iser_task->data[iser_dir];
111 struct ib_device *dev;
112
113 dev = iser_task->iser_conn->ib_conn.device->ib_device;
114 ib_dma_unmap_sg(dev, data->sg, data->size, dma_dir);
115
116 if (scsi_prot_sg_count(iser_task->sc)) {
117 struct iser_data_buf *pdata = &iser_task->prot[iser_dir];
118
119 ib_dma_unmap_sg(dev, pdata->sg, pdata->size, dma_dir);
120 }
121}
122
123static int iser_reg_dma(struct iser_device *device, struct iser_data_buf *mem,
124 struct iser_mem_reg *reg)
125{
126 struct scatterlist *sg = mem->sg;
127
128 reg->sge.lkey = device->pd->local_dma_lkey;
129 /*
130 * FIXME: rework the registration code path to differentiate
131 * rkey/lkey use cases
132 */
133
134 if (device->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)
135 reg->rkey = device->pd->unsafe_global_rkey;
136 else
137 reg->rkey = 0;
138 reg->sge.addr = sg_dma_address(&sg[0]);
139 reg->sge.length = sg_dma_len(&sg[0]);
140
141 iser_dbg("Single DMA entry: lkey=0x%x, rkey=0x%x, addr=0x%llx,"
142 " length=0x%x\n", reg->sge.lkey, reg->rkey,
143 reg->sge.addr, reg->sge.length);
144
145 return 0;
146}
147
148void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
149 enum iser_data_dir cmd_dir)
150{
151 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
152 struct iser_fr_desc *desc;
153 struct ib_mr_status mr_status;
154
155 desc = reg->desc;
156 if (!desc)
157 return;
158
159 /*
160 * The signature MR cannot be invalidated and reused without checking.
161 * libiscsi calls the check_protection transport handler only if
162 * SCSI-Response is received. And the signature MR is not checked if
163 * the task is completed for some other reason like a timeout or error
164 * handling. That's why we must check the signature MR here before
165 * putting it to the free pool.
166 */
167 if (unlikely(desc->sig_protected)) {
168 desc->sig_protected = false;
169 ib_check_mr_status(desc->rsc.sig_mr, IB_MR_CHECK_SIG_STATUS,
170 &mr_status);
171 }
172 iser_reg_desc_put_fr(&iser_task->iser_conn->ib_conn, reg->desc);
173 reg->desc = NULL;
174}
175
176static void iser_set_dif_domain(struct scsi_cmnd *sc,
177 struct ib_sig_domain *domain)
178{
179 domain->sig_type = IB_SIG_TYPE_T10_DIF;
180 domain->sig.dif.pi_interval = scsi_prot_interval(sc);
181 domain->sig.dif.ref_tag = t10_pi_ref_tag(scsi_cmd_to_rq(sc));
182 /*
183 * At the moment we hard code those, but in the future
184 * we will take them from sc.
185 */
186 domain->sig.dif.apptag_check_mask = 0xffff;
187 domain->sig.dif.app_escape = true;
188 domain->sig.dif.ref_escape = true;
189 if (sc->prot_flags & SCSI_PROT_REF_INCREMENT)
190 domain->sig.dif.ref_remap = true;
191}
192
193static int iser_set_sig_attrs(struct scsi_cmnd *sc,
194 struct ib_sig_attrs *sig_attrs)
195{
196 switch (scsi_get_prot_op(sc)) {
197 case SCSI_PROT_WRITE_INSERT:
198 case SCSI_PROT_READ_STRIP:
199 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
200 iser_set_dif_domain(sc, &sig_attrs->wire);
201 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
202 break;
203 case SCSI_PROT_READ_INSERT:
204 case SCSI_PROT_WRITE_STRIP:
205 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
206 iser_set_dif_domain(sc, &sig_attrs->mem);
207 sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
208 IB_T10DIF_CSUM : IB_T10DIF_CRC;
209 break;
210 case SCSI_PROT_READ_PASS:
211 case SCSI_PROT_WRITE_PASS:
212 iser_set_dif_domain(sc, &sig_attrs->wire);
213 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
214 iser_set_dif_domain(sc, &sig_attrs->mem);
215 sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
216 IB_T10DIF_CSUM : IB_T10DIF_CRC;
217 break;
218 default:
219 iser_err("Unsupported PI operation %d\n",
220 scsi_get_prot_op(sc));
221 return -EINVAL;
222 }
223
224 return 0;
225}
226
227static inline void iser_set_prot_checks(struct scsi_cmnd *sc, u8 *mask)
228{
229 *mask = 0;
230 if (sc->prot_flags & SCSI_PROT_REF_CHECK)
231 *mask |= IB_SIG_CHECK_REFTAG;
232 if (sc->prot_flags & SCSI_PROT_GUARD_CHECK)
233 *mask |= IB_SIG_CHECK_GUARD;
234}
235
236static inline void iser_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr,
237 struct ib_cqe *cqe, struct ib_send_wr *next_wr)
238{
239 inv_wr->opcode = IB_WR_LOCAL_INV;
240 inv_wr->wr_cqe = cqe;
241 inv_wr->ex.invalidate_rkey = mr->rkey;
242 inv_wr->send_flags = 0;
243 inv_wr->num_sge = 0;
244 inv_wr->next = next_wr;
245}
246
247static int iser_reg_sig_mr(struct iscsi_iser_task *iser_task,
248 struct iser_data_buf *mem,
249 struct iser_data_buf *sig_mem,
250 struct iser_reg_resources *rsc,
251 struct iser_mem_reg *sig_reg)
252{
253 struct iser_tx_desc *tx_desc = &iser_task->desc;
254 struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
255 struct ib_mr *mr = rsc->sig_mr;
256 struct ib_sig_attrs *sig_attrs = mr->sig_attrs;
257 struct ib_reg_wr *wr = &tx_desc->reg_wr;
258 int ret;
259
260 memset(sig_attrs, 0, sizeof(*sig_attrs));
261 ret = iser_set_sig_attrs(iser_task->sc, sig_attrs);
262 if (ret)
263 goto err;
264
265 iser_set_prot_checks(iser_task->sc, &sig_attrs->check_mask);
266
267 if (rsc->sig_mr->need_inval)
268 iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr);
269
270 ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
271
272 ret = ib_map_mr_sg_pi(mr, mem->sg, mem->dma_nents, NULL,
273 sig_mem->sg, sig_mem->dma_nents, NULL, SZ_4K);
274 if (unlikely(ret)) {
275 iser_err("failed to map PI sg (%d)\n",
276 mem->dma_nents + sig_mem->dma_nents);
277 goto err;
278 }
279
280 memset(wr, 0, sizeof(*wr));
281 wr->wr.next = &tx_desc->send_wr;
282 wr->wr.opcode = IB_WR_REG_MR_INTEGRITY;
283 wr->wr.wr_cqe = cqe;
284 wr->wr.num_sge = 0;
285 wr->wr.send_flags = 0;
286 wr->mr = mr;
287 wr->key = mr->rkey;
288 wr->access = IB_ACCESS_LOCAL_WRITE |
289 IB_ACCESS_REMOTE_READ |
290 IB_ACCESS_REMOTE_WRITE;
291 rsc->sig_mr->need_inval = true;
292
293 sig_reg->sge.lkey = mr->lkey;
294 sig_reg->rkey = mr->rkey;
295 sig_reg->sge.addr = mr->iova;
296 sig_reg->sge.length = mr->length;
297
298 iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=%u\n",
299 sig_reg->sge.lkey, sig_reg->rkey, sig_reg->sge.addr,
300 sig_reg->sge.length);
301err:
302 return ret;
303}
304
305static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
306 struct iser_data_buf *mem,
307 struct iser_reg_resources *rsc,
308 struct iser_mem_reg *reg)
309{
310 struct iser_tx_desc *tx_desc = &iser_task->desc;
311 struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
312 struct ib_mr *mr = rsc->mr;
313 struct ib_reg_wr *wr = &tx_desc->reg_wr;
314 int n;
315
316 if (rsc->mr->need_inval)
317 iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr);
318
319 ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
320
321 n = ib_map_mr_sg(mr, mem->sg, mem->dma_nents, NULL, SZ_4K);
322 if (unlikely(n != mem->dma_nents)) {
323 iser_err("failed to map sg (%d/%d)\n",
324 n, mem->dma_nents);
325 return n < 0 ? n : -EINVAL;
326 }
327
328 wr->wr.next = &tx_desc->send_wr;
329 wr->wr.opcode = IB_WR_REG_MR;
330 wr->wr.wr_cqe = cqe;
331 wr->wr.send_flags = 0;
332 wr->wr.num_sge = 0;
333 wr->mr = mr;
334 wr->key = mr->rkey;
335 wr->access = IB_ACCESS_LOCAL_WRITE |
336 IB_ACCESS_REMOTE_WRITE |
337 IB_ACCESS_REMOTE_READ;
338
339 rsc->mr->need_inval = true;
340
341 reg->sge.lkey = mr->lkey;
342 reg->rkey = mr->rkey;
343 reg->sge.addr = mr->iova;
344 reg->sge.length = mr->length;
345
346 iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=0x%x\n",
347 reg->sge.lkey, reg->rkey, reg->sge.addr, reg->sge.length);
348
349 return 0;
350}
351
352int iser_reg_mem_fastreg(struct iscsi_iser_task *task,
353 enum iser_data_dir dir,
354 bool all_imm)
355{
356 struct ib_conn *ib_conn = &task->iser_conn->ib_conn;
357 struct iser_device *device = ib_conn->device;
358 struct iser_data_buf *mem = &task->data[dir];
359 struct iser_mem_reg *reg = &task->rdma_reg[dir];
360 struct iser_fr_desc *desc;
361 bool use_dma_key;
362 int err;
363
364 use_dma_key = mem->dma_nents == 1 && (all_imm || !iser_always_reg) &&
365 scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL;
366 if (use_dma_key)
367 return iser_reg_dma(device, mem, reg);
368
369 desc = iser_reg_desc_get_fr(ib_conn);
370 if (scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL) {
371 err = iser_fast_reg_mr(task, mem, &desc->rsc, reg);
372 if (unlikely(err))
373 goto err_reg;
374 } else {
375 err = iser_reg_sig_mr(task, mem, &task->prot[dir],
376 &desc->rsc, reg);
377 if (unlikely(err))
378 goto err_reg;
379
380 desc->sig_protected = true;
381 }
382
383 reg->desc = desc;
384
385 return 0;
386
387err_reg:
388 iser_reg_desc_put_fr(ib_conn, desc);
389
390 return err;
391}
1/*
2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33#include <linux/module.h>
34#include <linux/kernel.h>
35#include <linux/slab.h>
36#include <linux/mm.h>
37#include <linux/highmem.h>
38#include <linux/scatterlist.h>
39
40#include "iscsi_iser.h"
41static
42int iser_fast_reg_fmr(struct iscsi_iser_task *iser_task,
43 struct iser_data_buf *mem,
44 struct iser_reg_resources *rsc,
45 struct iser_mem_reg *mem_reg);
46static
47int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
48 struct iser_data_buf *mem,
49 struct iser_reg_resources *rsc,
50 struct iser_mem_reg *mem_reg);
51
52static const struct iser_reg_ops fastreg_ops = {
53 .alloc_reg_res = iser_alloc_fastreg_pool,
54 .free_reg_res = iser_free_fastreg_pool,
55 .reg_mem = iser_fast_reg_mr,
56 .unreg_mem = iser_unreg_mem_fastreg,
57 .reg_desc_get = iser_reg_desc_get_fr,
58 .reg_desc_put = iser_reg_desc_put_fr,
59};
60
61static const struct iser_reg_ops fmr_ops = {
62 .alloc_reg_res = iser_alloc_fmr_pool,
63 .free_reg_res = iser_free_fmr_pool,
64 .reg_mem = iser_fast_reg_fmr,
65 .unreg_mem = iser_unreg_mem_fmr,
66 .reg_desc_get = iser_reg_desc_get_fmr,
67 .reg_desc_put = iser_reg_desc_put_fmr,
68};
69
70void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc)
71{
72 iser_err_comp(wc, "memreg");
73}
74
75int iser_assign_reg_ops(struct iser_device *device)
76{
77 struct ib_device *ib_dev = device->ib_device;
78
79 /* Assign function handles - based on FMR support */
80 if (ib_dev->alloc_fmr && ib_dev->dealloc_fmr &&
81 ib_dev->map_phys_fmr && ib_dev->unmap_fmr) {
82 iser_info("FMR supported, using FMR for registration\n");
83 device->reg_ops = &fmr_ops;
84 } else if (ib_dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
85 iser_info("FastReg supported, using FastReg for registration\n");
86 device->reg_ops = &fastreg_ops;
87 device->remote_inv_sup = iser_always_reg;
88 } else {
89 iser_err("IB device does not support FMRs nor FastRegs, can't register memory\n");
90 return -1;
91 }
92
93 return 0;
94}
95
96struct iser_fr_desc *
97iser_reg_desc_get_fr(struct ib_conn *ib_conn)
98{
99 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
100 struct iser_fr_desc *desc;
101 unsigned long flags;
102
103 spin_lock_irqsave(&fr_pool->lock, flags);
104 desc = list_first_entry(&fr_pool->list,
105 struct iser_fr_desc, list);
106 list_del(&desc->list);
107 spin_unlock_irqrestore(&fr_pool->lock, flags);
108
109 return desc;
110}
111
112void
113iser_reg_desc_put_fr(struct ib_conn *ib_conn,
114 struct iser_fr_desc *desc)
115{
116 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
117 unsigned long flags;
118
119 spin_lock_irqsave(&fr_pool->lock, flags);
120 list_add(&desc->list, &fr_pool->list);
121 spin_unlock_irqrestore(&fr_pool->lock, flags);
122}
123
124struct iser_fr_desc *
125iser_reg_desc_get_fmr(struct ib_conn *ib_conn)
126{
127 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
128
129 return list_first_entry(&fr_pool->list,
130 struct iser_fr_desc, list);
131}
132
133void
134iser_reg_desc_put_fmr(struct ib_conn *ib_conn,
135 struct iser_fr_desc *desc)
136{
137}
138
139static void iser_data_buf_dump(struct iser_data_buf *data,
140 struct ib_device *ibdev)
141{
142 struct scatterlist *sg;
143 int i;
144
145 for_each_sg(data->sg, sg, data->dma_nents, i)
146 iser_dbg("sg[%d] dma_addr:0x%lX page:0x%p "
147 "off:0x%x sz:0x%x dma_len:0x%x\n",
148 i, (unsigned long)ib_sg_dma_address(ibdev, sg),
149 sg_page(sg), sg->offset,
150 sg->length, ib_sg_dma_len(ibdev, sg));
151}
152
153static void iser_dump_page_vec(struct iser_page_vec *page_vec)
154{
155 int i;
156
157 iser_err("page vec npages %d data length %d\n",
158 page_vec->npages, page_vec->fake_mr.length);
159 for (i = 0; i < page_vec->npages; i++)
160 iser_err("vec[%d]: %llx\n", i, page_vec->pages[i]);
161}
162
163int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
164 struct iser_data_buf *data,
165 enum iser_data_dir iser_dir,
166 enum dma_data_direction dma_dir)
167{
168 struct ib_device *dev;
169
170 iser_task->dir[iser_dir] = 1;
171 dev = iser_task->iser_conn->ib_conn.device->ib_device;
172
173 data->dma_nents = ib_dma_map_sg(dev, data->sg, data->size, dma_dir);
174 if (data->dma_nents == 0) {
175 iser_err("dma_map_sg failed!!!\n");
176 return -EINVAL;
177 }
178 return 0;
179}
180
181void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
182 struct iser_data_buf *data,
183 enum dma_data_direction dir)
184{
185 struct ib_device *dev;
186
187 dev = iser_task->iser_conn->ib_conn.device->ib_device;
188 ib_dma_unmap_sg(dev, data->sg, data->size, dir);
189}
190
191static int
192iser_reg_dma(struct iser_device *device, struct iser_data_buf *mem,
193 struct iser_mem_reg *reg)
194{
195 struct scatterlist *sg = mem->sg;
196
197 reg->sge.lkey = device->pd->local_dma_lkey;
198 /*
199 * FIXME: rework the registration code path to differentiate
200 * rkey/lkey use cases
201 */
202
203 if (device->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)
204 reg->rkey = device->pd->unsafe_global_rkey;
205 else
206 reg->rkey = 0;
207 reg->sge.addr = ib_sg_dma_address(device->ib_device, &sg[0]);
208 reg->sge.length = ib_sg_dma_len(device->ib_device, &sg[0]);
209
210 iser_dbg("Single DMA entry: lkey=0x%x, rkey=0x%x, addr=0x%llx,"
211 " length=0x%x\n", reg->sge.lkey, reg->rkey,
212 reg->sge.addr, reg->sge.length);
213
214 return 0;
215}
216
217static int iser_set_page(struct ib_mr *mr, u64 addr)
218{
219 struct iser_page_vec *page_vec =
220 container_of(mr, struct iser_page_vec, fake_mr);
221
222 page_vec->pages[page_vec->npages++] = addr;
223
224 return 0;
225}
226
227static
228int iser_fast_reg_fmr(struct iscsi_iser_task *iser_task,
229 struct iser_data_buf *mem,
230 struct iser_reg_resources *rsc,
231 struct iser_mem_reg *reg)
232{
233 struct ib_conn *ib_conn = &iser_task->iser_conn->ib_conn;
234 struct iser_device *device = ib_conn->device;
235 struct iser_page_vec *page_vec = rsc->page_vec;
236 struct ib_fmr_pool *fmr_pool = rsc->fmr_pool;
237 struct ib_pool_fmr *fmr;
238 int ret, plen;
239
240 page_vec->npages = 0;
241 page_vec->fake_mr.page_size = SIZE_4K;
242 plen = ib_sg_to_pages(&page_vec->fake_mr, mem->sg,
243 mem->size, NULL, iser_set_page);
244 if (unlikely(plen < mem->size)) {
245 iser_err("page vec too short to hold this SG\n");
246 iser_data_buf_dump(mem, device->ib_device);
247 iser_dump_page_vec(page_vec);
248 return -EINVAL;
249 }
250
251 fmr = ib_fmr_pool_map_phys(fmr_pool, page_vec->pages,
252 page_vec->npages, page_vec->pages[0]);
253 if (IS_ERR(fmr)) {
254 ret = PTR_ERR(fmr);
255 iser_err("ib_fmr_pool_map_phys failed: %d\n", ret);
256 return ret;
257 }
258
259 reg->sge.lkey = fmr->fmr->lkey;
260 reg->rkey = fmr->fmr->rkey;
261 reg->sge.addr = page_vec->fake_mr.iova;
262 reg->sge.length = page_vec->fake_mr.length;
263 reg->mem_h = fmr;
264
265 iser_dbg("fmr reg: lkey=0x%x, rkey=0x%x, addr=0x%llx,"
266 " length=0x%x\n", reg->sge.lkey, reg->rkey,
267 reg->sge.addr, reg->sge.length);
268
269 return 0;
270}
271
272/**
273 * Unregister (previosuly registered using FMR) memory.
274 * If memory is non-FMR does nothing.
275 */
276void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
277 enum iser_data_dir cmd_dir)
278{
279 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
280 int ret;
281
282 if (!reg->mem_h)
283 return;
284
285 iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n", reg->mem_h);
286
287 ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h);
288 if (ret)
289 iser_err("ib_fmr_pool_unmap failed %d\n", ret);
290
291 reg->mem_h = NULL;
292}
293
294void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
295 enum iser_data_dir cmd_dir)
296{
297 struct iser_device *device = iser_task->iser_conn->ib_conn.device;
298 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
299
300 if (!reg->mem_h)
301 return;
302
303 device->reg_ops->reg_desc_put(&iser_task->iser_conn->ib_conn,
304 reg->mem_h);
305 reg->mem_h = NULL;
306}
307
308static void
309iser_set_dif_domain(struct scsi_cmnd *sc, struct ib_sig_attrs *sig_attrs,
310 struct ib_sig_domain *domain)
311{
312 domain->sig_type = IB_SIG_TYPE_T10_DIF;
313 domain->sig.dif.pi_interval = scsi_prot_interval(sc);
314 domain->sig.dif.ref_tag = scsi_prot_ref_tag(sc);
315 /*
316 * At the moment we hard code those, but in the future
317 * we will take them from sc.
318 */
319 domain->sig.dif.apptag_check_mask = 0xffff;
320 domain->sig.dif.app_escape = true;
321 domain->sig.dif.ref_escape = true;
322 if (sc->prot_flags & SCSI_PROT_REF_INCREMENT)
323 domain->sig.dif.ref_remap = true;
324};
325
326static int
327iser_set_sig_attrs(struct scsi_cmnd *sc, struct ib_sig_attrs *sig_attrs)
328{
329 switch (scsi_get_prot_op(sc)) {
330 case SCSI_PROT_WRITE_INSERT:
331 case SCSI_PROT_READ_STRIP:
332 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
333 iser_set_dif_domain(sc, sig_attrs, &sig_attrs->wire);
334 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
335 break;
336 case SCSI_PROT_READ_INSERT:
337 case SCSI_PROT_WRITE_STRIP:
338 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
339 iser_set_dif_domain(sc, sig_attrs, &sig_attrs->mem);
340 sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
341 IB_T10DIF_CSUM : IB_T10DIF_CRC;
342 break;
343 case SCSI_PROT_READ_PASS:
344 case SCSI_PROT_WRITE_PASS:
345 iser_set_dif_domain(sc, sig_attrs, &sig_attrs->wire);
346 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
347 iser_set_dif_domain(sc, sig_attrs, &sig_attrs->mem);
348 sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
349 IB_T10DIF_CSUM : IB_T10DIF_CRC;
350 break;
351 default:
352 iser_err("Unsupported PI operation %d\n",
353 scsi_get_prot_op(sc));
354 return -EINVAL;
355 }
356
357 return 0;
358}
359
360static inline void
361iser_set_prot_checks(struct scsi_cmnd *sc, u8 *mask)
362{
363 *mask = 0;
364 if (sc->prot_flags & SCSI_PROT_REF_CHECK)
365 *mask |= ISER_CHECK_REFTAG;
366 if (sc->prot_flags & SCSI_PROT_GUARD_CHECK)
367 *mask |= ISER_CHECK_GUARD;
368}
369
370static inline void
371iser_inv_rkey(struct ib_send_wr *inv_wr,
372 struct ib_mr *mr,
373 struct ib_cqe *cqe)
374{
375 inv_wr->opcode = IB_WR_LOCAL_INV;
376 inv_wr->wr_cqe = cqe;
377 inv_wr->ex.invalidate_rkey = mr->rkey;
378 inv_wr->send_flags = 0;
379 inv_wr->num_sge = 0;
380}
381
382static int
383iser_reg_sig_mr(struct iscsi_iser_task *iser_task,
384 struct iser_pi_context *pi_ctx,
385 struct iser_mem_reg *data_reg,
386 struct iser_mem_reg *prot_reg,
387 struct iser_mem_reg *sig_reg)
388{
389 struct iser_tx_desc *tx_desc = &iser_task->desc;
390 struct ib_sig_attrs *sig_attrs = &tx_desc->sig_attrs;
391 struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
392 struct ib_sig_handover_wr *wr;
393 struct ib_mr *mr = pi_ctx->sig_mr;
394 int ret;
395
396 memset(sig_attrs, 0, sizeof(*sig_attrs));
397 ret = iser_set_sig_attrs(iser_task->sc, sig_attrs);
398 if (ret)
399 goto err;
400
401 iser_set_prot_checks(iser_task->sc, &sig_attrs->check_mask);
402
403 if (pi_ctx->sig_mr_valid)
404 iser_inv_rkey(iser_tx_next_wr(tx_desc), mr, cqe);
405
406 ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
407
408 wr = sig_handover_wr(iser_tx_next_wr(tx_desc));
409 wr->wr.opcode = IB_WR_REG_SIG_MR;
410 wr->wr.wr_cqe = cqe;
411 wr->wr.sg_list = &data_reg->sge;
412 wr->wr.num_sge = 1;
413 wr->wr.send_flags = 0;
414 wr->sig_attrs = sig_attrs;
415 wr->sig_mr = mr;
416 if (scsi_prot_sg_count(iser_task->sc))
417 wr->prot = &prot_reg->sge;
418 else
419 wr->prot = NULL;
420 wr->access_flags = IB_ACCESS_LOCAL_WRITE |
421 IB_ACCESS_REMOTE_READ |
422 IB_ACCESS_REMOTE_WRITE;
423 pi_ctx->sig_mr_valid = 1;
424
425 sig_reg->sge.lkey = mr->lkey;
426 sig_reg->rkey = mr->rkey;
427 sig_reg->sge.addr = 0;
428 sig_reg->sge.length = scsi_transfer_length(iser_task->sc);
429
430 iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=%u\n",
431 sig_reg->sge.lkey, sig_reg->rkey, sig_reg->sge.addr,
432 sig_reg->sge.length);
433err:
434 return ret;
435}
436
437static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
438 struct iser_data_buf *mem,
439 struct iser_reg_resources *rsc,
440 struct iser_mem_reg *reg)
441{
442 struct iser_tx_desc *tx_desc = &iser_task->desc;
443 struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
444 struct ib_mr *mr = rsc->mr;
445 struct ib_reg_wr *wr;
446 int n;
447
448 if (rsc->mr_valid)
449 iser_inv_rkey(iser_tx_next_wr(tx_desc), mr, cqe);
450
451 ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
452
453 n = ib_map_mr_sg(mr, mem->sg, mem->size, NULL, SIZE_4K);
454 if (unlikely(n != mem->size)) {
455 iser_err("failed to map sg (%d/%d)\n",
456 n, mem->size);
457 return n < 0 ? n : -EINVAL;
458 }
459
460 wr = reg_wr(iser_tx_next_wr(tx_desc));
461 wr->wr.opcode = IB_WR_REG_MR;
462 wr->wr.wr_cqe = cqe;
463 wr->wr.send_flags = 0;
464 wr->wr.num_sge = 0;
465 wr->mr = mr;
466 wr->key = mr->rkey;
467 wr->access = IB_ACCESS_LOCAL_WRITE |
468 IB_ACCESS_REMOTE_WRITE |
469 IB_ACCESS_REMOTE_READ;
470
471 rsc->mr_valid = 1;
472
473 reg->sge.lkey = mr->lkey;
474 reg->rkey = mr->rkey;
475 reg->sge.addr = mr->iova;
476 reg->sge.length = mr->length;
477
478 iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=0x%x\n",
479 reg->sge.lkey, reg->rkey, reg->sge.addr, reg->sge.length);
480
481 return 0;
482}
483
484static int
485iser_reg_prot_sg(struct iscsi_iser_task *task,
486 struct iser_data_buf *mem,
487 struct iser_fr_desc *desc,
488 bool use_dma_key,
489 struct iser_mem_reg *reg)
490{
491 struct iser_device *device = task->iser_conn->ib_conn.device;
492
493 if (use_dma_key)
494 return iser_reg_dma(device, mem, reg);
495
496 return device->reg_ops->reg_mem(task, mem, &desc->pi_ctx->rsc, reg);
497}
498
499static int
500iser_reg_data_sg(struct iscsi_iser_task *task,
501 struct iser_data_buf *mem,
502 struct iser_fr_desc *desc,
503 bool use_dma_key,
504 struct iser_mem_reg *reg)
505{
506 struct iser_device *device = task->iser_conn->ib_conn.device;
507
508 if (use_dma_key)
509 return iser_reg_dma(device, mem, reg);
510
511 return device->reg_ops->reg_mem(task, mem, &desc->rsc, reg);
512}
513
514int iser_reg_rdma_mem(struct iscsi_iser_task *task,
515 enum iser_data_dir dir,
516 bool all_imm)
517{
518 struct ib_conn *ib_conn = &task->iser_conn->ib_conn;
519 struct iser_device *device = ib_conn->device;
520 struct iser_data_buf *mem = &task->data[dir];
521 struct iser_mem_reg *reg = &task->rdma_reg[dir];
522 struct iser_mem_reg *data_reg;
523 struct iser_fr_desc *desc = NULL;
524 bool use_dma_key;
525 int err;
526
527 use_dma_key = mem->dma_nents == 1 && (all_imm || !iser_always_reg) &&
528 scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL;
529
530 if (!use_dma_key) {
531 desc = device->reg_ops->reg_desc_get(ib_conn);
532 reg->mem_h = desc;
533 }
534
535 if (scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL)
536 data_reg = reg;
537 else
538 data_reg = &task->desc.data_reg;
539
540 err = iser_reg_data_sg(task, mem, desc, use_dma_key, data_reg);
541 if (unlikely(err))
542 goto err_reg;
543
544 if (scsi_get_prot_op(task->sc) != SCSI_PROT_NORMAL) {
545 struct iser_mem_reg *prot_reg = &task->desc.prot_reg;
546
547 if (scsi_prot_sg_count(task->sc)) {
548 mem = &task->prot[dir];
549 err = iser_reg_prot_sg(task, mem, desc,
550 use_dma_key, prot_reg);
551 if (unlikely(err))
552 goto err_reg;
553 }
554
555 err = iser_reg_sig_mr(task, desc->pi_ctx, data_reg,
556 prot_reg, reg);
557 if (unlikely(err))
558 goto err_reg;
559
560 desc->pi_ctx->sig_protected = 1;
561 }
562
563 return 0;
564
565err_reg:
566 if (desc)
567 device->reg_ops->reg_desc_put(ib_conn, desc);
568
569 return err;
570}
571
572void iser_unreg_rdma_mem(struct iscsi_iser_task *task,
573 enum iser_data_dir dir)
574{
575 struct iser_device *device = task->iser_conn->ib_conn.device;
576
577 device->reg_ops->unreg_mem(task, dir);
578}