2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
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:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
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.
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
33 #include <linux/module.h>
34 #include <linux/kernel.h>
35 #include <linux/slab.h>
37 #include <linux/highmem.h>
38 #include <linux/scatterlist.h>
40 #include "iscsi_iser.h"
42 #define ISER_KMALLOC_THRESHOLD 0x20000 /* 128K - kmalloc limit */
45 * iser_start_rdma_unaligned_sg
47 static int iser_start_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
48 struct iser_data_buf *data,
49 struct iser_data_buf *data_copy,
50 enum iser_data_dir cmd_dir)
52 struct ib_device *dev = iser_task->ib_conn->device->ib_device;
53 struct scatterlist *sgl = (struct scatterlist *)data->buf;
54 struct scatterlist *sg;
56 unsigned long cmd_data_len = 0;
59 for_each_sg(sgl, sg, data->size, i)
60 cmd_data_len += ib_sg_dma_len(dev, sg);
62 if (cmd_data_len > ISER_KMALLOC_THRESHOLD)
63 mem = (void *)__get_free_pages(GFP_ATOMIC,
64 ilog2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT);
66 mem = kmalloc(cmd_data_len, GFP_ATOMIC);
69 iser_err("Failed to allocate mem size %d %d for copying sglist\n",
70 data->size, (int)cmd_data_len);
74 if (cmd_dir == ISER_DIR_OUT) {
75 /* copy the unaligned sg the buffer which is used for RDMA */
79 sgl = (struct scatterlist *)data->buf;
81 for_each_sg(sgl, sg, data->size, i) {
82 from = kmap_atomic(sg_page(sg));
91 sg_init_one(&data_copy->sg_single, mem, cmd_data_len);
92 data_copy->buf = &data_copy->sg_single;
94 data_copy->copy_buf = mem;
96 dma_nents = ib_dma_map_sg(dev, &data_copy->sg_single, 1,
97 (cmd_dir == ISER_DIR_OUT) ?
98 DMA_TO_DEVICE : DMA_FROM_DEVICE);
99 BUG_ON(dma_nents == 0);
101 data_copy->dma_nents = dma_nents;
102 data_copy->data_len = cmd_data_len;
108 * iser_finalize_rdma_unaligned_sg
111 void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
112 struct iser_data_buf *data,
113 struct iser_data_buf *data_copy,
114 enum iser_data_dir cmd_dir)
116 struct ib_device *dev;
117 unsigned long cmd_data_len;
119 dev = iser_task->ib_conn->device->ib_device;
121 ib_dma_unmap_sg(dev, &data_copy->sg_single, 1,
122 (cmd_dir == ISER_DIR_OUT) ?
123 DMA_TO_DEVICE : DMA_FROM_DEVICE);
125 if (cmd_dir == ISER_DIR_IN) {
127 struct scatterlist *sgl, *sg;
128 unsigned char *p, *to;
129 unsigned int sg_size;
132 /* copy back read RDMA to unaligned sg */
133 mem = data_copy->copy_buf;
135 sgl = (struct scatterlist *)data->buf;
136 sg_size = data->size;
139 for_each_sg(sgl, sg, sg_size, i) {
140 to = kmap_atomic(sg_page(sg));
141 memcpy(to + sg->offset,
149 cmd_data_len = data->data_len;
151 if (cmd_data_len > ISER_KMALLOC_THRESHOLD)
152 free_pages((unsigned long)data_copy->copy_buf,
153 ilog2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT);
155 kfree(data_copy->copy_buf);
157 data_copy->copy_buf = NULL;
160 #define IS_4K_ALIGNED(addr) ((((unsigned long)addr) & ~MASK_4K) == 0)
163 * iser_sg_to_page_vec - Translates scatterlist entries to physical addresses
164 * and returns the length of resulting physical address array (may be less than
165 * the original due to possible compaction).
167 * we build a "page vec" under the assumption that the SG meets the RDMA
168 * alignment requirements. Other then the first and last SG elements, all
169 * the "internal" elements can be compacted into a list whose elements are
170 * dma addresses of physical pages. The code supports also the weird case
171 * where --few fragments of the same page-- are present in the SG as
172 * consecutive elements. Also, it handles one entry SG.
175 static int iser_sg_to_page_vec(struct iser_data_buf *data,
176 struct ib_device *ibdev, u64 *pages,
177 int *offset, int *data_size)
179 struct scatterlist *sg, *sgl = (struct scatterlist *)data->buf;
180 u64 start_addr, end_addr, page, chunk_start = 0;
181 unsigned long total_sz = 0;
182 unsigned int dma_len;
183 int i, new_chunk, cur_page, last_ent = data->dma_nents - 1;
185 /* compute the offset of first element */
186 *offset = (u64) sgl[0].offset & ~MASK_4K;
190 for_each_sg(sgl, sg, data->dma_nents, i) {
191 start_addr = ib_sg_dma_address(ibdev, sg);
193 chunk_start = start_addr;
194 dma_len = ib_sg_dma_len(ibdev, sg);
195 end_addr = start_addr + dma_len;
198 /* collect page fragments until aligned or end of SG list */
199 if (!IS_4K_ALIGNED(end_addr) && i < last_ent) {
205 /* address of the first page in the contiguous chunk;
206 masking relevant for the very first SG entry,
207 which might be unaligned */
208 page = chunk_start & MASK_4K;
210 pages[cur_page++] = page;
212 } while (page < end_addr);
215 *data_size = total_sz;
216 iser_dbg("page_vec->data_size:%d cur_page %d\n",
217 *data_size, cur_page);
223 * iser_data_buf_aligned_len - Tries to determine the maximal correctly aligned
224 * for RDMA sub-list of a scatter-gather list of memory buffers, and returns
225 * the number of entries which are aligned correctly. Supports the case where
226 * consecutive SG elements are actually fragments of the same physcial page.
228 static int iser_data_buf_aligned_len(struct iser_data_buf *data,
229 struct ib_device *ibdev)
231 struct scatterlist *sgl, *sg, *next_sg = NULL;
232 u64 start_addr, end_addr;
233 int i, ret_len, start_check = 0;
235 if (data->dma_nents == 1)
238 sgl = (struct scatterlist *)data->buf;
239 start_addr = ib_sg_dma_address(ibdev, sgl);
241 for_each_sg(sgl, sg, data->dma_nents, i) {
242 if (start_check && !IS_4K_ALIGNED(start_addr))
245 next_sg = sg_next(sg);
249 end_addr = start_addr + ib_sg_dma_len(ibdev, sg);
250 start_addr = ib_sg_dma_address(ibdev, next_sg);
252 if (end_addr == start_addr) {
258 if (!IS_4K_ALIGNED(end_addr))
261 ret_len = (next_sg) ? i : i+1;
262 iser_dbg("Found %d aligned entries out of %d in sg:0x%p\n",
263 ret_len, data->dma_nents, data);
267 static void iser_data_buf_dump(struct iser_data_buf *data,
268 struct ib_device *ibdev)
270 struct scatterlist *sgl = (struct scatterlist *)data->buf;
271 struct scatterlist *sg;
274 for_each_sg(sgl, sg, data->dma_nents, i)
275 iser_dbg("sg[%d] dma_addr:0x%lX page:0x%p "
276 "off:0x%x sz:0x%x dma_len:0x%x\n",
277 i, (unsigned long)ib_sg_dma_address(ibdev, sg),
278 sg_page(sg), sg->offset,
279 sg->length, ib_sg_dma_len(ibdev, sg));
282 static void iser_dump_page_vec(struct iser_page_vec *page_vec)
286 iser_err("page vec length %d data size %d\n",
287 page_vec->length, page_vec->data_size);
288 for (i = 0; i < page_vec->length; i++)
289 iser_err("%d %lx\n",i,(unsigned long)page_vec->pages[i]);
292 static void iser_page_vec_build(struct iser_data_buf *data,
293 struct iser_page_vec *page_vec,
294 struct ib_device *ibdev)
296 int page_vec_len = 0;
298 page_vec->length = 0;
299 page_vec->offset = 0;
301 iser_dbg("Translating sg sz: %d\n", data->dma_nents);
302 page_vec_len = iser_sg_to_page_vec(data, ibdev, page_vec->pages,
304 &page_vec->data_size);
305 iser_dbg("sg len %d page_vec_len %d\n", data->dma_nents, page_vec_len);
307 page_vec->length = page_vec_len;
309 if (page_vec_len * SIZE_4K < page_vec->data_size) {
310 iser_err("page_vec too short to hold this SG\n");
311 iser_data_buf_dump(data, ibdev);
312 iser_dump_page_vec(page_vec);
317 int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
318 struct iser_data_buf *data,
319 enum iser_data_dir iser_dir,
320 enum dma_data_direction dma_dir)
322 struct ib_device *dev;
324 iser_task->dir[iser_dir] = 1;
325 dev = iser_task->ib_conn->device->ib_device;
327 data->dma_nents = ib_dma_map_sg(dev, data->buf, data->size, dma_dir);
328 if (data->dma_nents == 0) {
329 iser_err("dma_map_sg failed!!!\n");
335 void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
336 struct iser_data_buf *data)
338 struct ib_device *dev;
340 dev = iser_task->ib_conn->device->ib_device;
341 ib_dma_unmap_sg(dev, data->buf, data->size, DMA_FROM_DEVICE);
344 static int fall_to_bounce_buf(struct iscsi_iser_task *iser_task,
345 struct ib_device *ibdev,
346 struct iser_data_buf *mem,
347 struct iser_data_buf *mem_copy,
348 enum iser_data_dir cmd_dir,
351 struct iscsi_conn *iscsi_conn = iser_task->ib_conn->iscsi_conn;
353 iscsi_conn->fmr_unalign_cnt++;
354 iser_warn("rdma alignment violation (%d/%d aligned) or FMR not supported\n",
355 aligned_len, mem->size);
357 if (iser_debug_level > 0)
358 iser_data_buf_dump(mem, ibdev);
360 /* unmap the command data before accessing it */
361 iser_dma_unmap_task_data(iser_task, mem);
363 /* allocate copy buf, if we are writing, copy the */
364 /* unaligned scatterlist, dma map the copy */
365 if (iser_start_rdma_unaligned_sg(iser_task, mem, mem_copy, cmd_dir) != 0)
372 * iser_reg_rdma_mem_fmr - Registers memory intended for RDMA,
373 * using FMR (if possible) obtaining rkey and va
375 * returns 0 on success, errno code on failure
377 int iser_reg_rdma_mem_fmr(struct iscsi_iser_task *iser_task,
378 enum iser_data_dir cmd_dir)
380 struct iser_conn *ib_conn = iser_task->ib_conn;
381 struct iser_device *device = ib_conn->device;
382 struct ib_device *ibdev = device->ib_device;
383 struct iser_data_buf *mem = &iser_task->data[cmd_dir];
384 struct iser_regd_buf *regd_buf;
388 struct scatterlist *sg;
390 regd_buf = &iser_task->rdma_regd[cmd_dir];
392 aligned_len = iser_data_buf_aligned_len(mem, ibdev);
393 if (aligned_len != mem->dma_nents) {
394 err = fall_to_bounce_buf(iser_task, ibdev, mem,
395 &iser_task->data_copy[cmd_dir],
396 cmd_dir, aligned_len);
398 iser_err("failed to allocate bounce buffer\n");
401 mem = &iser_task->data_copy[cmd_dir];
404 /* if there a single dma entry, FMR is not needed */
405 if (mem->dma_nents == 1) {
406 sg = (struct scatterlist *)mem->buf;
408 regd_buf->reg.lkey = device->mr->lkey;
409 regd_buf->reg.rkey = device->mr->rkey;
410 regd_buf->reg.len = ib_sg_dma_len(ibdev, &sg[0]);
411 regd_buf->reg.va = ib_sg_dma_address(ibdev, &sg[0]);
412 regd_buf->reg.is_mr = 0;
414 iser_dbg("PHYSICAL Mem.register: lkey: 0x%08X rkey: 0x%08X "
415 "va: 0x%08lX sz: %ld]\n",
416 (unsigned int)regd_buf->reg.lkey,
417 (unsigned int)regd_buf->reg.rkey,
418 (unsigned long)regd_buf->reg.va,
419 (unsigned long)regd_buf->reg.len);
420 } else { /* use FMR for multiple dma entries */
421 iser_page_vec_build(mem, ib_conn->fmr.page_vec, ibdev);
422 err = iser_reg_page_vec(ib_conn, ib_conn->fmr.page_vec,
424 if (err && err != -EAGAIN) {
425 iser_data_buf_dump(mem, ibdev);
426 iser_err("mem->dma_nents = %d (dlength = 0x%x)\n",
428 ntoh24(iser_task->desc.iscsi_header.dlength));
429 iser_err("page_vec: data_size = 0x%x, length = %d, offset = 0x%x\n",
430 ib_conn->fmr.page_vec->data_size,
431 ib_conn->fmr.page_vec->length,
432 ib_conn->fmr.page_vec->offset);
433 for (i = 0; i < ib_conn->fmr.page_vec->length; i++)
434 iser_err("page_vec[%d] = 0x%llx\n", i,
435 (unsigned long long) ib_conn->fmr.page_vec->pages[i]);
443 static inline enum ib_t10_dif_type
444 scsi2ib_prot_type(unsigned char prot_type)
447 case SCSI_PROT_DIF_TYPE0:
448 return IB_T10DIF_NONE;
449 case SCSI_PROT_DIF_TYPE1:
450 return IB_T10DIF_TYPE1;
451 case SCSI_PROT_DIF_TYPE2:
452 return IB_T10DIF_TYPE2;
453 case SCSI_PROT_DIF_TYPE3:
454 return IB_T10DIF_TYPE3;
456 return IB_T10DIF_NONE;
462 iser_set_sig_attrs(struct scsi_cmnd *sc, struct ib_sig_attrs *sig_attrs)
464 unsigned char scsi_ptype = scsi_get_prot_type(sc);
466 sig_attrs->mem.sig_type = IB_SIG_TYPE_T10_DIF;
467 sig_attrs->wire.sig_type = IB_SIG_TYPE_T10_DIF;
468 sig_attrs->mem.sig.dif.pi_interval = sc->device->sector_size;
469 sig_attrs->wire.sig.dif.pi_interval = sc->device->sector_size;
471 switch (scsi_get_prot_op(sc)) {
472 case SCSI_PROT_WRITE_INSERT:
473 case SCSI_PROT_READ_STRIP:
474 sig_attrs->mem.sig.dif.type = IB_T10DIF_NONE;
475 sig_attrs->wire.sig.dif.type = scsi2ib_prot_type(scsi_ptype);
476 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
477 sig_attrs->wire.sig.dif.ref_tag = scsi_get_lba(sc) &
480 case SCSI_PROT_READ_INSERT:
481 case SCSI_PROT_WRITE_STRIP:
482 sig_attrs->mem.sig.dif.type = scsi2ib_prot_type(scsi_ptype);
483 sig_attrs->mem.sig.dif.bg_type = IB_T10DIF_CRC;
484 sig_attrs->mem.sig.dif.ref_tag = scsi_get_lba(sc) &
486 sig_attrs->wire.sig.dif.type = IB_T10DIF_NONE;
488 case SCSI_PROT_READ_PASS:
489 case SCSI_PROT_WRITE_PASS:
490 sig_attrs->mem.sig.dif.type = scsi2ib_prot_type(scsi_ptype);
491 sig_attrs->mem.sig.dif.bg_type = IB_T10DIF_CRC;
492 sig_attrs->mem.sig.dif.ref_tag = scsi_get_lba(sc) &
494 sig_attrs->wire.sig.dif.type = scsi2ib_prot_type(scsi_ptype);
495 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
496 sig_attrs->wire.sig.dif.ref_tag = scsi_get_lba(sc) &
500 iser_err("Unsupported PI operation %d\n",
501 scsi_get_prot_op(sc));
509 iser_set_prot_checks(struct scsi_cmnd *sc, u8 *mask)
511 switch (scsi_get_prot_type(sc)) {
512 case SCSI_PROT_DIF_TYPE0:
515 case SCSI_PROT_DIF_TYPE1:
516 case SCSI_PROT_DIF_TYPE2:
517 *mask = ISER_CHECK_GUARD | ISER_CHECK_REFTAG;
519 case SCSI_PROT_DIF_TYPE3:
520 *mask = ISER_CHECK_GUARD;
523 iser_err("Unsupported protection type %d\n",
524 scsi_get_prot_type(sc));
532 iser_reg_sig_mr(struct iscsi_iser_task *iser_task,
533 struct fast_reg_descriptor *desc, struct ib_sge *data_sge,
534 struct ib_sge *prot_sge, struct ib_sge *sig_sge)
536 struct iser_conn *ib_conn = iser_task->ib_conn;
537 struct iser_pi_context *pi_ctx = desc->pi_ctx;
538 struct ib_send_wr sig_wr, inv_wr;
539 struct ib_send_wr *bad_wr, *wr = NULL;
540 struct ib_sig_attrs sig_attrs;
544 memset(&sig_attrs, 0, sizeof(sig_attrs));
545 ret = iser_set_sig_attrs(iser_task->sc, &sig_attrs);
549 ret = iser_set_prot_checks(iser_task->sc, &sig_attrs.check_mask);
553 if (!(desc->reg_indicators & ISER_SIG_KEY_VALID)) {
554 memset(&inv_wr, 0, sizeof(inv_wr));
555 inv_wr.opcode = IB_WR_LOCAL_INV;
556 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
557 inv_wr.ex.invalidate_rkey = pi_ctx->sig_mr->rkey;
560 key = (u8)(pi_ctx->sig_mr->rkey & 0x000000FF);
561 ib_update_fast_reg_key(pi_ctx->sig_mr, ++key);
564 memset(&sig_wr, 0, sizeof(sig_wr));
565 sig_wr.opcode = IB_WR_REG_SIG_MR;
566 sig_wr.wr_id = ISER_FASTREG_LI_WRID;
567 sig_wr.sg_list = data_sge;
569 sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
570 sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
571 if (scsi_prot_sg_count(iser_task->sc))
572 sig_wr.wr.sig_handover.prot = prot_sge;
573 sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE |
574 IB_ACCESS_REMOTE_READ |
575 IB_ACCESS_REMOTE_WRITE;
582 ret = ib_post_send(ib_conn->qp, wr, &bad_wr);
584 iser_err("reg_sig_mr failed, ret:%d\n", ret);
587 desc->reg_indicators &= ~ISER_SIG_KEY_VALID;
589 sig_sge->lkey = pi_ctx->sig_mr->lkey;
591 sig_sge->length = data_sge->length + prot_sge->length;
592 if (scsi_get_prot_op(iser_task->sc) == SCSI_PROT_WRITE_INSERT ||
593 scsi_get_prot_op(iser_task->sc) == SCSI_PROT_READ_STRIP) {
594 sig_sge->length += (data_sge->length /
595 iser_task->sc->device->sector_size) * 8;
598 iser_dbg("sig_sge: addr: 0x%llx length: %u lkey: 0x%x\n",
599 sig_sge->addr, sig_sge->length,
605 static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
606 struct iser_regd_buf *regd_buf,
607 struct iser_data_buf *mem,
608 enum iser_reg_indicator ind,
611 struct fast_reg_descriptor *desc = regd_buf->reg.mem_h;
612 struct iser_conn *ib_conn = iser_task->ib_conn;
613 struct iser_device *device = ib_conn->device;
614 struct ib_device *ibdev = device->ib_device;
616 struct ib_fast_reg_page_list *frpl;
617 struct ib_send_wr fastreg_wr, inv_wr;
618 struct ib_send_wr *bad_wr, *wr = NULL;
620 int ret, offset, size, plen;
622 /* if there a single dma entry, dma mr suffices */
623 if (mem->dma_nents == 1) {
624 struct scatterlist *sg = (struct scatterlist *)mem->buf;
626 sge->lkey = device->mr->lkey;
627 sge->addr = ib_sg_dma_address(ibdev, &sg[0]);
628 sge->length = ib_sg_dma_len(ibdev, &sg[0]);
630 iser_dbg("Single DMA entry: lkey=0x%x, addr=0x%llx, length=0x%x\n",
631 sge->lkey, sge->addr, sge->length);
635 if (ind == ISER_DATA_KEY_VALID) {
637 frpl = desc->data_frpl;
639 mr = desc->pi_ctx->prot_mr;
640 frpl = desc->pi_ctx->prot_frpl;
643 plen = iser_sg_to_page_vec(mem, device->ib_device, frpl->page_list,
645 if (plen * SIZE_4K < size) {
646 iser_err("fast reg page_list too short to hold this SG\n");
650 if (!(desc->reg_indicators & ind)) {
651 memset(&inv_wr, 0, sizeof(inv_wr));
652 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
653 inv_wr.opcode = IB_WR_LOCAL_INV;
654 inv_wr.ex.invalidate_rkey = mr->rkey;
657 key = (u8)(mr->rkey & 0x000000FF);
658 ib_update_fast_reg_key(mr, ++key);
661 /* Prepare FASTREG WR */
662 memset(&fastreg_wr, 0, sizeof(fastreg_wr));
663 fastreg_wr.wr_id = ISER_FASTREG_LI_WRID;
664 fastreg_wr.opcode = IB_WR_FAST_REG_MR;
665 fastreg_wr.wr.fast_reg.iova_start = frpl->page_list[0] + offset;
666 fastreg_wr.wr.fast_reg.page_list = frpl;
667 fastreg_wr.wr.fast_reg.page_list_len = plen;
668 fastreg_wr.wr.fast_reg.page_shift = SHIFT_4K;
669 fastreg_wr.wr.fast_reg.length = size;
670 fastreg_wr.wr.fast_reg.rkey = mr->rkey;
671 fastreg_wr.wr.fast_reg.access_flags = (IB_ACCESS_LOCAL_WRITE |
672 IB_ACCESS_REMOTE_WRITE |
673 IB_ACCESS_REMOTE_READ);
678 wr->next = &fastreg_wr;
680 ret = ib_post_send(ib_conn->qp, wr, &bad_wr);
682 iser_err("fast registration failed, ret:%d\n", ret);
685 desc->reg_indicators &= ~ind;
687 sge->lkey = mr->lkey;
688 sge->addr = frpl->page_list[0] + offset;
695 * iser_reg_rdma_mem_fastreg - Registers memory intended for RDMA,
696 * using Fast Registration WR (if possible) obtaining rkey and va
698 * returns 0 on success, errno code on failure
700 int iser_reg_rdma_mem_fastreg(struct iscsi_iser_task *iser_task,
701 enum iser_data_dir cmd_dir)
703 struct iser_conn *ib_conn = iser_task->ib_conn;
704 struct iser_device *device = ib_conn->device;
705 struct ib_device *ibdev = device->ib_device;
706 struct iser_data_buf *mem = &iser_task->data[cmd_dir];
707 struct iser_regd_buf *regd_buf = &iser_task->rdma_regd[cmd_dir];
708 struct fast_reg_descriptor *desc = NULL;
709 struct ib_sge data_sge;
710 int err, aligned_len;
713 aligned_len = iser_data_buf_aligned_len(mem, ibdev);
714 if (aligned_len != mem->dma_nents) {
715 err = fall_to_bounce_buf(iser_task, ibdev, mem,
716 &iser_task->data_copy[cmd_dir],
717 cmd_dir, aligned_len);
719 iser_err("failed to allocate bounce buffer\n");
722 mem = &iser_task->data_copy[cmd_dir];
725 if (mem->dma_nents != 1 ||
726 scsi_get_prot_op(iser_task->sc) != SCSI_PROT_NORMAL) {
727 spin_lock_irqsave(&ib_conn->lock, flags);
728 desc = list_first_entry(&ib_conn->fastreg.pool,
729 struct fast_reg_descriptor, list);
730 list_del(&desc->list);
731 spin_unlock_irqrestore(&ib_conn->lock, flags);
732 regd_buf->reg.mem_h = desc;
735 err = iser_fast_reg_mr(iser_task, regd_buf, mem,
736 ISER_DATA_KEY_VALID, &data_sge);
740 if (scsi_get_prot_op(iser_task->sc) != SCSI_PROT_NORMAL) {
741 struct ib_sge prot_sge, sig_sge;
743 memset(&prot_sge, 0, sizeof(prot_sge));
744 if (scsi_prot_sg_count(iser_task->sc)) {
745 mem = &iser_task->prot[cmd_dir];
746 aligned_len = iser_data_buf_aligned_len(mem, ibdev);
747 if (aligned_len != mem->dma_nents) {
748 err = fall_to_bounce_buf(iser_task, ibdev, mem,
749 &iser_task->prot_copy[cmd_dir],
750 cmd_dir, aligned_len);
752 iser_err("failed to allocate bounce buffer\n");
755 mem = &iser_task->prot_copy[cmd_dir];
758 err = iser_fast_reg_mr(iser_task, regd_buf, mem,
759 ISER_PROT_KEY_VALID, &prot_sge);
764 err = iser_reg_sig_mr(iser_task, desc, &data_sge,
765 &prot_sge, &sig_sge);
767 iser_err("Failed to register signature mr\n");
770 desc->reg_indicators |= ISER_FASTREG_PROTECTED;
772 regd_buf->reg.lkey = sig_sge.lkey;
773 regd_buf->reg.rkey = desc->pi_ctx->sig_mr->rkey;
774 regd_buf->reg.va = sig_sge.addr;
775 regd_buf->reg.len = sig_sge.length;
776 regd_buf->reg.is_mr = 1;
779 regd_buf->reg.rkey = desc->data_mr->rkey;
780 regd_buf->reg.is_mr = 1;
782 regd_buf->reg.rkey = device->mr->rkey;
783 regd_buf->reg.is_mr = 0;
786 regd_buf->reg.lkey = data_sge.lkey;
787 regd_buf->reg.va = data_sge.addr;
788 regd_buf->reg.len = data_sge.length;
794 spin_lock_irqsave(&ib_conn->lock, flags);
795 list_add_tail(&desc->list, &ib_conn->fastreg.pool);
796 spin_unlock_irqrestore(&ib_conn->lock, flags);