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6461f64a OG |
1 | /* |
2 | * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. 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. | |
6461f64a OG |
31 | */ |
32 | #include <linux/module.h> | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/mm.h> | |
a1f8e7f7 | 36 | #include <linux/highmem.h> |
6461f64a OG |
37 | #include <linux/scatterlist.h> |
38 | ||
39 | #include "iscsi_iser.h" | |
40 | ||
41 | #define ISER_KMALLOC_THRESHOLD 0x20000 /* 128K - kmalloc limit */ | |
8dfa0876 | 42 | |
6461f64a OG |
43 | /** |
44 | * iser_start_rdma_unaligned_sg | |
45 | */ | |
2261ec3d | 46 | static int iser_start_rdma_unaligned_sg(struct iscsi_iser_task *iser_task, |
41179e2d | 47 | enum iser_data_dir cmd_dir) |
6461f64a OG |
48 | { |
49 | int dma_nents; | |
5180311f | 50 | struct ib_device *dev; |
6461f64a | 51 | char *mem = NULL; |
2261ec3d | 52 | struct iser_data_buf *data = &iser_task->data[cmd_dir]; |
6461f64a OG |
53 | unsigned long cmd_data_len = data->data_len; |
54 | ||
55 | if (cmd_data_len > ISER_KMALLOC_THRESHOLD) | |
528f4e8c | 56 | mem = (void *)__get_free_pages(GFP_ATOMIC, |
f0d1b0b3 | 57 | ilog2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT); |
6461f64a | 58 | else |
528f4e8c | 59 | mem = kmalloc(cmd_data_len, GFP_ATOMIC); |
6461f64a OG |
60 | |
61 | if (mem == NULL) { | |
62 | iser_err("Failed to allocate mem size %d %d for copying sglist\n", | |
63 | data->size,(int)cmd_data_len); | |
64 | return -ENOMEM; | |
65 | } | |
66 | ||
67 | if (cmd_dir == ISER_DIR_OUT) { | |
68 | /* copy the unaligned sg the buffer which is used for RDMA */ | |
53d412fc JA |
69 | struct scatterlist *sgl = (struct scatterlist *)data->buf; |
70 | struct scatterlist *sg; | |
6461f64a OG |
71 | int i; |
72 | char *p, *from; | |
73 | ||
53d412fc JA |
74 | p = mem; |
75 | for_each_sg(sgl, sg, data->size, i) { | |
2a156d09 | 76 | from = kmap_atomic(sg_page(sg)); |
6461f64a | 77 | memcpy(p, |
53d412fc JA |
78 | from + sg->offset, |
79 | sg->length); | |
2a156d09 | 80 | kunmap_atomic(from); |
53d412fc | 81 | p += sg->length; |
6461f64a OG |
82 | } |
83 | } | |
84 | ||
2261ec3d MC |
85 | sg_init_one(&iser_task->data_copy[cmd_dir].sg_single, mem, cmd_data_len); |
86 | iser_task->data_copy[cmd_dir].buf = | |
87 | &iser_task->data_copy[cmd_dir].sg_single; | |
88 | iser_task->data_copy[cmd_dir].size = 1; | |
6461f64a | 89 | |
2261ec3d | 90 | iser_task->data_copy[cmd_dir].copy_buf = mem; |
6461f64a | 91 | |
2261ec3d | 92 | dev = iser_task->iser_conn->ib_conn->device->ib_device; |
5180311f | 93 | dma_nents = ib_dma_map_sg(dev, |
2261ec3d | 94 | &iser_task->data_copy[cmd_dir].sg_single, |
5180311f RC |
95 | 1, |
96 | (cmd_dir == ISER_DIR_OUT) ? | |
97 | DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
6461f64a OG |
98 | BUG_ON(dma_nents == 0); |
99 | ||
2261ec3d | 100 | iser_task->data_copy[cmd_dir].dma_nents = dma_nents; |
6461f64a OG |
101 | return 0; |
102 | } | |
103 | ||
104 | /** | |
105 | * iser_finalize_rdma_unaligned_sg | |
106 | */ | |
2261ec3d | 107 | void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task, |
6461f64a OG |
108 | enum iser_data_dir cmd_dir) |
109 | { | |
5180311f | 110 | struct ib_device *dev; |
6461f64a OG |
111 | struct iser_data_buf *mem_copy; |
112 | unsigned long cmd_data_len; | |
113 | ||
2261ec3d MC |
114 | dev = iser_task->iser_conn->ib_conn->device->ib_device; |
115 | mem_copy = &iser_task->data_copy[cmd_dir]; | |
6461f64a | 116 | |
5180311f RC |
117 | ib_dma_unmap_sg(dev, &mem_copy->sg_single, 1, |
118 | (cmd_dir == ISER_DIR_OUT) ? | |
119 | DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
6461f64a OG |
120 | |
121 | if (cmd_dir == ISER_DIR_IN) { | |
122 | char *mem; | |
53d412fc | 123 | struct scatterlist *sgl, *sg; |
6461f64a OG |
124 | unsigned char *p, *to; |
125 | unsigned int sg_size; | |
126 | int i; | |
127 | ||
128 | /* copy back read RDMA to unaligned sg */ | |
129 | mem = mem_copy->copy_buf; | |
130 | ||
2261ec3d MC |
131 | sgl = (struct scatterlist *)iser_task->data[ISER_DIR_IN].buf; |
132 | sg_size = iser_task->data[ISER_DIR_IN].size; | |
6461f64a | 133 | |
53d412fc JA |
134 | p = mem; |
135 | for_each_sg(sgl, sg, sg_size, i) { | |
2a156d09 | 136 | to = kmap_atomic(sg_page(sg)); |
53d412fc | 137 | memcpy(to + sg->offset, |
6461f64a | 138 | p, |
53d412fc | 139 | sg->length); |
2a156d09 | 140 | kunmap_atomic(to); |
53d412fc | 141 | p += sg->length; |
6461f64a OG |
142 | } |
143 | } | |
144 | ||
2261ec3d | 145 | cmd_data_len = iser_task->data[cmd_dir].data_len; |
6461f64a OG |
146 | |
147 | if (cmd_data_len > ISER_KMALLOC_THRESHOLD) | |
148 | free_pages((unsigned long)mem_copy->copy_buf, | |
f0d1b0b3 | 149 | ilog2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT); |
6461f64a OG |
150 | else |
151 | kfree(mem_copy->copy_buf); | |
152 | ||
153 | mem_copy->copy_buf = NULL; | |
154 | } | |
155 | ||
c1ccaf24 OG |
156 | #define IS_4K_ALIGNED(addr) ((((unsigned long)addr) & ~MASK_4K) == 0) |
157 | ||
6461f64a OG |
158 | /** |
159 | * iser_sg_to_page_vec - Translates scatterlist entries to physical addresses | |
160 | * and returns the length of resulting physical address array (may be less than | |
161 | * the original due to possible compaction). | |
162 | * | |
163 | * we build a "page vec" under the assumption that the SG meets the RDMA | |
164 | * alignment requirements. Other then the first and last SG elements, all | |
165 | * the "internal" elements can be compacted into a list whose elements are | |
166 | * dma addresses of physical pages. The code supports also the weird case | |
167 | * where --few fragments of the same page-- are present in the SG as | |
168 | * consecutive elements. Also, it handles one entry SG. | |
169 | */ | |
c1ccaf24 | 170 | |
6461f64a | 171 | static int iser_sg_to_page_vec(struct iser_data_buf *data, |
5180311f RC |
172 | struct iser_page_vec *page_vec, |
173 | struct ib_device *ibdev) | |
6461f64a | 174 | { |
c1ccaf24 OG |
175 | struct scatterlist *sg, *sgl = (struct scatterlist *)data->buf; |
176 | u64 start_addr, end_addr, page, chunk_start = 0; | |
6461f64a | 177 | unsigned long total_sz = 0; |
c1ccaf24 OG |
178 | unsigned int dma_len; |
179 | int i, new_chunk, cur_page, last_ent = data->dma_nents - 1; | |
6461f64a OG |
180 | |
181 | /* compute the offset of first element */ | |
53d412fc | 182 | page_vec->offset = (u64) sgl[0].offset & ~MASK_4K; |
6461f64a | 183 | |
c1ccaf24 OG |
184 | new_chunk = 1; |
185 | cur_page = 0; | |
53d412fc | 186 | for_each_sg(sgl, sg, data->dma_nents, i) { |
c1ccaf24 OG |
187 | start_addr = ib_sg_dma_address(ibdev, sg); |
188 | if (new_chunk) | |
189 | chunk_start = start_addr; | |
190 | dma_len = ib_sg_dma_len(ibdev, sg); | |
191 | end_addr = start_addr + dma_len; | |
5180311f | 192 | total_sz += dma_len; |
6461f64a | 193 | |
c1ccaf24 OG |
194 | /* collect page fragments until aligned or end of SG list */ |
195 | if (!IS_4K_ALIGNED(end_addr) && i < last_ent) { | |
196 | new_chunk = 0; | |
197 | continue; | |
6461f64a | 198 | } |
c1ccaf24 OG |
199 | new_chunk = 1; |
200 | ||
201 | /* address of the first page in the contiguous chunk; | |
202 | masking relevant for the very first SG entry, | |
203 | which might be unaligned */ | |
204 | page = chunk_start & MASK_4K; | |
205 | do { | |
206 | page_vec->pages[cur_page++] = page; | |
8dfa0876 | 207 | page += SIZE_4K; |
c1ccaf24 | 208 | } while (page < end_addr); |
6461f64a | 209 | } |
c1ccaf24 | 210 | |
6461f64a OG |
211 | page_vec->data_size = total_sz; |
212 | iser_dbg("page_vec->data_size:%d cur_page %d\n", page_vec->data_size,cur_page); | |
213 | return cur_page; | |
214 | } | |
215 | ||
6461f64a OG |
216 | |
217 | /** | |
218 | * iser_data_buf_aligned_len - Tries to determine the maximal correctly aligned | |
219 | * for RDMA sub-list of a scatter-gather list of memory buffers, and returns | |
220 | * the number of entries which are aligned correctly. Supports the case where | |
221 | * consecutive SG elements are actually fragments of the same physcial page. | |
222 | */ | |
c1ccaf24 OG |
223 | static int iser_data_buf_aligned_len(struct iser_data_buf *data, |
224 | struct ib_device *ibdev) | |
6461f64a | 225 | { |
c1ccaf24 OG |
226 | struct scatterlist *sgl, *sg, *next_sg = NULL; |
227 | u64 start_addr, end_addr; | |
228 | int i, ret_len, start_check = 0; | |
229 | ||
230 | if (data->dma_nents == 1) | |
231 | return 1; | |
6461f64a | 232 | |
53d412fc | 233 | sgl = (struct scatterlist *)data->buf; |
c1ccaf24 | 234 | start_addr = ib_sg_dma_address(ibdev, sgl); |
6461f64a | 235 | |
53d412fc | 236 | for_each_sg(sgl, sg, data->dma_nents, i) { |
c1ccaf24 OG |
237 | if (start_check && !IS_4K_ALIGNED(start_addr)) |
238 | break; | |
239 | ||
240 | next_sg = sg_next(sg); | |
241 | if (!next_sg) | |
242 | break; | |
243 | ||
244 | end_addr = start_addr + ib_sg_dma_len(ibdev, sg); | |
245 | start_addr = ib_sg_dma_address(ibdev, next_sg); | |
246 | ||
247 | if (end_addr == start_addr) { | |
248 | start_check = 0; | |
249 | continue; | |
250 | } else | |
251 | start_check = 1; | |
252 | ||
253 | if (!IS_4K_ALIGNED(end_addr)) | |
254 | break; | |
6461f64a | 255 | } |
c1ccaf24 | 256 | ret_len = (next_sg) ? i : i+1; |
6461f64a OG |
257 | iser_dbg("Found %d aligned entries out of %d in sg:0x%p\n", |
258 | ret_len, data->dma_nents, data); | |
259 | return ret_len; | |
260 | } | |
261 | ||
5180311f RC |
262 | static void iser_data_buf_dump(struct iser_data_buf *data, |
263 | struct ib_device *ibdev) | |
6461f64a | 264 | { |
53d412fc JA |
265 | struct scatterlist *sgl = (struct scatterlist *)data->buf; |
266 | struct scatterlist *sg; | |
6461f64a OG |
267 | int i; |
268 | ||
6f735e36 ED |
269 | if (iser_debug_level == 0) |
270 | return; | |
271 | ||
53d412fc | 272 | for_each_sg(sgl, sg, data->dma_nents, i) |
6f735e36 | 273 | iser_warn("sg[%d] dma_addr:0x%lX page:0x%p " |
e981f1d4 | 274 | "off:0x%x sz:0x%x dma_len:0x%x\n", |
53d412fc | 275 | i, (unsigned long)ib_sg_dma_address(ibdev, sg), |
45711f1a | 276 | sg_page(sg), sg->offset, |
53d412fc | 277 | sg->length, ib_sg_dma_len(ibdev, sg)); |
6461f64a OG |
278 | } |
279 | ||
280 | static void iser_dump_page_vec(struct iser_page_vec *page_vec) | |
281 | { | |
282 | int i; | |
283 | ||
284 | iser_err("page vec length %d data size %d\n", | |
285 | page_vec->length, page_vec->data_size); | |
286 | for (i = 0; i < page_vec->length; i++) | |
287 | iser_err("%d %lx\n",i,(unsigned long)page_vec->pages[i]); | |
288 | } | |
289 | ||
290 | static void iser_page_vec_build(struct iser_data_buf *data, | |
5180311f RC |
291 | struct iser_page_vec *page_vec, |
292 | struct ib_device *ibdev) | |
6461f64a OG |
293 | { |
294 | int page_vec_len = 0; | |
295 | ||
296 | page_vec->length = 0; | |
297 | page_vec->offset = 0; | |
298 | ||
299 | iser_dbg("Translating sg sz: %d\n", data->dma_nents); | |
5180311f | 300 | page_vec_len = iser_sg_to_page_vec(data, page_vec, ibdev); |
6461f64a OG |
301 | iser_dbg("sg len %d page_vec_len %d\n", data->dma_nents,page_vec_len); |
302 | ||
303 | page_vec->length = page_vec_len; | |
304 | ||
8dfa0876 | 305 | if (page_vec_len * SIZE_4K < page_vec->data_size) { |
6461f64a | 306 | iser_err("page_vec too short to hold this SG\n"); |
5180311f | 307 | iser_data_buf_dump(data, ibdev); |
6461f64a OG |
308 | iser_dump_page_vec(page_vec); |
309 | BUG(); | |
310 | } | |
311 | } | |
312 | ||
2261ec3d MC |
313 | int iser_dma_map_task_data(struct iscsi_iser_task *iser_task, |
314 | struct iser_data_buf *data, | |
315 | enum iser_data_dir iser_dir, | |
316 | enum dma_data_direction dma_dir) | |
74a20780 | 317 | { |
5180311f | 318 | struct ib_device *dev; |
74a20780 | 319 | |
2261ec3d MC |
320 | iser_task->dir[iser_dir] = 1; |
321 | dev = iser_task->iser_conn->ib_conn->device->ib_device; | |
74a20780 | 322 | |
5180311f | 323 | data->dma_nents = ib_dma_map_sg(dev, data->buf, data->size, dma_dir); |
74a20780 EZ |
324 | if (data->dma_nents == 0) { |
325 | iser_err("dma_map_sg failed!!!\n"); | |
326 | return -EINVAL; | |
327 | } | |
328 | return 0; | |
329 | } | |
330 | ||
2261ec3d | 331 | void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task) |
74a20780 | 332 | { |
5180311f | 333 | struct ib_device *dev; |
74a20780 EZ |
334 | struct iser_data_buf *data; |
335 | ||
2261ec3d | 336 | dev = iser_task->iser_conn->ib_conn->device->ib_device; |
74a20780 | 337 | |
2261ec3d MC |
338 | if (iser_task->dir[ISER_DIR_IN]) { |
339 | data = &iser_task->data[ISER_DIR_IN]; | |
5180311f | 340 | ib_dma_unmap_sg(dev, data->buf, data->size, DMA_FROM_DEVICE); |
74a20780 EZ |
341 | } |
342 | ||
2261ec3d MC |
343 | if (iser_task->dir[ISER_DIR_OUT]) { |
344 | data = &iser_task->data[ISER_DIR_OUT]; | |
5180311f | 345 | ib_dma_unmap_sg(dev, data->buf, data->size, DMA_TO_DEVICE); |
74a20780 EZ |
346 | } |
347 | } | |
348 | ||
6461f64a OG |
349 | /** |
350 | * iser_reg_rdma_mem - Registers memory intended for RDMA, | |
351 | * obtaining rkey and va | |
352 | * | |
353 | * returns 0 on success, errno code on failure | |
354 | */ | |
2261ec3d | 355 | int iser_reg_rdma_mem(struct iscsi_iser_task *iser_task, |
6461f64a OG |
356 | enum iser_data_dir cmd_dir) |
357 | { | |
2261ec3d MC |
358 | struct iscsi_conn *iscsi_conn = iser_task->iser_conn->iscsi_conn; |
359 | struct iser_conn *ib_conn = iser_task->iser_conn->ib_conn; | |
d8111028 | 360 | struct iser_device *device = ib_conn->device; |
5180311f | 361 | struct ib_device *ibdev = device->ib_device; |
2261ec3d | 362 | struct iser_data_buf *mem = &iser_task->data[cmd_dir]; |
6461f64a OG |
363 | struct iser_regd_buf *regd_buf; |
364 | int aligned_len; | |
365 | int err; | |
e981f1d4 | 366 | int i; |
d8111028 | 367 | struct scatterlist *sg; |
6461f64a | 368 | |
2261ec3d | 369 | regd_buf = &iser_task->rdma_regd[cmd_dir]; |
6461f64a | 370 | |
5180311f | 371 | aligned_len = iser_data_buf_aligned_len(mem, ibdev); |
5525d210 OG |
372 | if (aligned_len != mem->dma_nents || |
373 | (!ib_conn->fmr_pool && mem->dma_nents > 1)) { | |
87528227 | 374 | iscsi_conn->fmr_unalign_cnt++; |
5525d210 OG |
375 | iser_warn("rdma alignment violation (%d/%d aligned) or FMR not supported\n", |
376 | aligned_len, mem->size); | |
5180311f | 377 | iser_data_buf_dump(mem, ibdev); |
74a20780 EZ |
378 | |
379 | /* unmap the command data before accessing it */ | |
2261ec3d | 380 | iser_dma_unmap_task_data(iser_task); |
74a20780 | 381 | |
6461f64a OG |
382 | /* allocate copy buf, if we are writing, copy the */ |
383 | /* unaligned scatterlist, dma map the copy */ | |
2261ec3d | 384 | if (iser_start_rdma_unaligned_sg(iser_task, cmd_dir) != 0) |
6461f64a | 385 | return -ENOMEM; |
2261ec3d | 386 | mem = &iser_task->data_copy[cmd_dir]; |
6461f64a OG |
387 | } |
388 | ||
d8111028 EZ |
389 | /* if there a single dma entry, FMR is not needed */ |
390 | if (mem->dma_nents == 1) { | |
391 | sg = (struct scatterlist *)mem->buf; | |
392 | ||
393 | regd_buf->reg.lkey = device->mr->lkey; | |
394 | regd_buf->reg.rkey = device->mr->rkey; | |
5180311f RC |
395 | regd_buf->reg.len = ib_sg_dma_len(ibdev, &sg[0]); |
396 | regd_buf->reg.va = ib_sg_dma_address(ibdev, &sg[0]); | |
d8111028 EZ |
397 | regd_buf->reg.is_fmr = 0; |
398 | ||
399 | iser_dbg("PHYSICAL Mem.register: lkey: 0x%08X rkey: 0x%08X " | |
400 | "va: 0x%08lX sz: %ld]\n", | |
401 | (unsigned int)regd_buf->reg.lkey, | |
402 | (unsigned int)regd_buf->reg.rkey, | |
403 | (unsigned long)regd_buf->reg.va, | |
404 | (unsigned long)regd_buf->reg.len); | |
405 | } else { /* use FMR for multiple dma entries */ | |
5180311f | 406 | iser_page_vec_build(mem, ib_conn->page_vec, ibdev); |
d8111028 | 407 | err = iser_reg_page_vec(ib_conn, ib_conn->page_vec, ®d_buf->reg); |
819a0873 | 408 | if (err && err != -EAGAIN) { |
5180311f | 409 | iser_data_buf_dump(mem, ibdev); |
2261ec3d MC |
410 | iser_err("mem->dma_nents = %d (dlength = 0x%x)\n", |
411 | mem->dma_nents, | |
412 | ntoh24(iser_task->desc.iscsi_header.dlength)); | |
d8111028 EZ |
413 | iser_err("page_vec: data_size = 0x%x, length = %d, offset = 0x%x\n", |
414 | ib_conn->page_vec->data_size, ib_conn->page_vec->length, | |
415 | ib_conn->page_vec->offset); | |
416 | for (i=0 ; i<ib_conn->page_vec->length ; i++) | |
417 | iser_err("page_vec[%d] = 0x%llx\n", i, | |
418 | (unsigned long long) ib_conn->page_vec->pages[i]); | |
e981f1d4 | 419 | } |
450d1e40 OG |
420 | if (err) |
421 | return err; | |
e981f1d4 | 422 | } |
6461f64a OG |
423 | return 0; |
424 | } |