| /* |
| * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. |
| * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved. |
| * |
| * This software is available to you under a choice of one of two |
| * licenses. You may choose to be licensed under the terms of the GNU |
| * General Public License (GPL) Version 2, available from the file |
| * COPYING in the main directory of this source tree, or the |
| * OpenIB.org BSD license below: |
| * |
| * Redistribution and use in source and binary forms, with or |
| * without modification, are permitted provided that the following |
| * conditions are met: |
| * |
| * - Redistributions of source code must retain the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials |
| * provided with the distribution. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/mm.h> |
| #include <linux/highmem.h> |
| #include <linux/scatterlist.h> |
| |
| #include "iscsi_iser.h" |
| |
| #define ISER_KMALLOC_THRESHOLD 0x20000 /* 128K - kmalloc limit */ |
| |
| /** |
| * iser_start_rdma_unaligned_sg |
| */ |
| static int iser_start_rdma_unaligned_sg(struct iscsi_iser_task *iser_task, |
| struct iser_data_buf *data, |
| struct iser_data_buf *data_copy, |
| enum iser_data_dir cmd_dir) |
| { |
| struct ib_device *dev = iser_task->iser_conn->ib_conn.device->ib_device; |
| struct scatterlist *sgl = (struct scatterlist *)data->buf; |
| struct scatterlist *sg; |
| char *mem = NULL; |
| unsigned long cmd_data_len = 0; |
| int dma_nents, i; |
| |
| for_each_sg(sgl, sg, data->size, i) |
| cmd_data_len += ib_sg_dma_len(dev, sg); |
| |
| if (cmd_data_len > ISER_KMALLOC_THRESHOLD) |
| mem = (void *)__get_free_pages(GFP_ATOMIC, |
| ilog2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT); |
| else |
| mem = kmalloc(cmd_data_len, GFP_ATOMIC); |
| |
| if (mem == NULL) { |
| iser_err("Failed to allocate mem size %d %d for copying sglist\n", |
| data->size, (int)cmd_data_len); |
| return -ENOMEM; |
| } |
| |
| if (cmd_dir == ISER_DIR_OUT) { |
| /* copy the unaligned sg the buffer which is used for RDMA */ |
| char *p, *from; |
| |
| sgl = (struct scatterlist *)data->buf; |
| p = mem; |
| for_each_sg(sgl, sg, data->size, i) { |
| from = kmap_atomic(sg_page(sg)); |
| memcpy(p, |
| from + sg->offset, |
| sg->length); |
| kunmap_atomic(from); |
| p += sg->length; |
| } |
| } |
| |
| sg_init_one(&data_copy->sg_single, mem, cmd_data_len); |
| data_copy->buf = &data_copy->sg_single; |
| data_copy->size = 1; |
| data_copy->copy_buf = mem; |
| |
| dma_nents = ib_dma_map_sg(dev, &data_copy->sg_single, 1, |
| (cmd_dir == ISER_DIR_OUT) ? |
| DMA_TO_DEVICE : DMA_FROM_DEVICE); |
| BUG_ON(dma_nents == 0); |
| |
| data_copy->dma_nents = dma_nents; |
| data_copy->data_len = cmd_data_len; |
| |
| return 0; |
| } |
| |
| /** |
| * iser_finalize_rdma_unaligned_sg |
| */ |
| |
| void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task, |
| struct iser_data_buf *data, |
| struct iser_data_buf *data_copy, |
| enum iser_data_dir cmd_dir) |
| { |
| struct ib_device *dev; |
| unsigned long cmd_data_len; |
| |
| dev = iser_task->iser_conn->ib_conn.device->ib_device; |
| |
| ib_dma_unmap_sg(dev, &data_copy->sg_single, 1, |
| (cmd_dir == ISER_DIR_OUT) ? |
| DMA_TO_DEVICE : DMA_FROM_DEVICE); |
| |
| if (cmd_dir == ISER_DIR_IN) { |
| char *mem; |
| struct scatterlist *sgl, *sg; |
| unsigned char *p, *to; |
| unsigned int sg_size; |
| int i; |
| |
| /* copy back read RDMA to unaligned sg */ |
| mem = data_copy->copy_buf; |
| |
| sgl = (struct scatterlist *)data->buf; |
| sg_size = data->size; |
| |
| p = mem; |
| for_each_sg(sgl, sg, sg_size, i) { |
| to = kmap_atomic(sg_page(sg)); |
| memcpy(to + sg->offset, |
| p, |
| sg->length); |
| kunmap_atomic(to); |
| p += sg->length; |
| } |
| } |
| |
| cmd_data_len = data->data_len; |
| |
| if (cmd_data_len > ISER_KMALLOC_THRESHOLD) |
| free_pages((unsigned long)data_copy->copy_buf, |
| ilog2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT); |
| else |
| kfree(data_copy->copy_buf); |
| |
| data_copy->copy_buf = NULL; |
| } |
| |
| #define IS_4K_ALIGNED(addr) ((((unsigned long)addr) & ~MASK_4K) == 0) |
| |
| /** |
| * iser_sg_to_page_vec - Translates scatterlist entries to physical addresses |
| * and returns the length of resulting physical address array (may be less than |
| * the original due to possible compaction). |
| * |
| * we build a "page vec" under the assumption that the SG meets the RDMA |
| * alignment requirements. Other then the first and last SG elements, all |
| * the "internal" elements can be compacted into a list whose elements are |
| * dma addresses of physical pages. The code supports also the weird case |
| * where --few fragments of the same page-- are present in the SG as |
| * consecutive elements. Also, it handles one entry SG. |
| */ |
| |
| static int iser_sg_to_page_vec(struct iser_data_buf *data, |
| struct ib_device *ibdev, u64 *pages, |
| int *offset, int *data_size) |
| { |
| struct scatterlist *sg, *sgl = (struct scatterlist *)data->buf; |
| u64 start_addr, end_addr, page, chunk_start = 0; |
| unsigned long total_sz = 0; |
| unsigned int dma_len; |
| int i, new_chunk, cur_page, last_ent = data->dma_nents - 1; |
| |
| /* compute the offset of first element */ |
| *offset = (u64) sgl[0].offset & ~MASK_4K; |
| |
| new_chunk = 1; |
| cur_page = 0; |
| for_each_sg(sgl, sg, data->dma_nents, i) { |
| start_addr = ib_sg_dma_address(ibdev, sg); |
| if (new_chunk) |
| chunk_start = start_addr; |
| dma_len = ib_sg_dma_len(ibdev, sg); |
| end_addr = start_addr + dma_len; |
| total_sz += dma_len; |
| |
| /* collect page fragments until aligned or end of SG list */ |
| if (!IS_4K_ALIGNED(end_addr) && i < last_ent) { |
| new_chunk = 0; |
| continue; |
| } |
| new_chunk = 1; |
| |
| /* address of the first page in the contiguous chunk; |
| masking relevant for the very first SG entry, |
| which might be unaligned */ |
| page = chunk_start & MASK_4K; |
| do { |
| pages[cur_page++] = page; |
| page += SIZE_4K; |
| } while (page < end_addr); |
| } |
| |
| *data_size = total_sz; |
| iser_dbg("page_vec->data_size:%d cur_page %d\n", |
| *data_size, cur_page); |
| return cur_page; |
| } |
| |
| |
| /** |
| * iser_data_buf_aligned_len - Tries to determine the maximal correctly aligned |
| * for RDMA sub-list of a scatter-gather list of memory buffers, and returns |
| * the number of entries which are aligned correctly. Supports the case where |
| * consecutive SG elements are actually fragments of the same physcial page. |
| */ |
| static int iser_data_buf_aligned_len(struct iser_data_buf *data, |
| struct ib_device *ibdev) |
| { |
| struct scatterlist *sgl, *sg, *next_sg = NULL; |
| u64 start_addr, end_addr; |
| int i, ret_len, start_check = 0; |
| |
| if (data->dma_nents == 1) |
| return 1; |
| |
| sgl = (struct scatterlist *)data->buf; |
| start_addr = ib_sg_dma_address(ibdev, sgl); |
| |
| for_each_sg(sgl, sg, data->dma_nents, i) { |
| if (start_check && !IS_4K_ALIGNED(start_addr)) |
| break; |
| |
| next_sg = sg_next(sg); |
| if (!next_sg) |
| break; |
| |
| end_addr = start_addr + ib_sg_dma_len(ibdev, sg); |
| start_addr = ib_sg_dma_address(ibdev, next_sg); |
| |
| if (end_addr == start_addr) { |
| start_check = 0; |
| continue; |
| } else |
| start_check = 1; |
| |
| if (!IS_4K_ALIGNED(end_addr)) |
| break; |
| } |
| ret_len = (next_sg) ? i : i+1; |
| iser_dbg("Found %d aligned entries out of %d in sg:0x%p\n", |
| ret_len, data->dma_nents, data); |
| return ret_len; |
| } |
| |
| static void iser_data_buf_dump(struct iser_data_buf *data, |
| struct ib_device *ibdev) |
| { |
| struct scatterlist *sgl = (struct scatterlist *)data->buf; |
| struct scatterlist *sg; |
| int i; |
| |
| for_each_sg(sgl, sg, data->dma_nents, i) |
| iser_dbg("sg[%d] dma_addr:0x%lX page:0x%p " |
| "off:0x%x sz:0x%x dma_len:0x%x\n", |
| i, (unsigned long)ib_sg_dma_address(ibdev, sg), |
| sg_page(sg), sg->offset, |
| sg->length, ib_sg_dma_len(ibdev, sg)); |
| } |
| |
| static void iser_dump_page_vec(struct iser_page_vec *page_vec) |
| { |
| int i; |
| |
| iser_err("page vec length %d data size %d\n", |
| page_vec->length, page_vec->data_size); |
| for (i = 0; i < page_vec->length; i++) |
| iser_err("%d %lx\n",i,(unsigned long)page_vec->pages[i]); |
| } |
| |
| static void iser_page_vec_build(struct iser_data_buf *data, |
| struct iser_page_vec *page_vec, |
| struct ib_device *ibdev) |
| { |
| int page_vec_len = 0; |
| |
| page_vec->length = 0; |
| page_vec->offset = 0; |
| |
| iser_dbg("Translating sg sz: %d\n", data->dma_nents); |
| page_vec_len = iser_sg_to_page_vec(data, ibdev, page_vec->pages, |
| &page_vec->offset, |
| &page_vec->data_size); |
| iser_dbg("sg len %d page_vec_len %d\n", data->dma_nents, page_vec_len); |
| |
| page_vec->length = page_vec_len; |
| |
| if (page_vec_len * SIZE_4K < page_vec->data_size) { |
| iser_err("page_vec too short to hold this SG\n"); |
| iser_data_buf_dump(data, ibdev); |
| iser_dump_page_vec(page_vec); |
| BUG(); |
| } |
| } |
| |
| int iser_dma_map_task_data(struct iscsi_iser_task *iser_task, |
| struct iser_data_buf *data, |
| enum iser_data_dir iser_dir, |
| enum dma_data_direction dma_dir) |
| { |
| struct ib_device *dev; |
| |
| iser_task->dir[iser_dir] = 1; |
| dev = iser_task->iser_conn->ib_conn.device->ib_device; |
| |
| data->dma_nents = ib_dma_map_sg(dev, data->buf, data->size, dma_dir); |
| if (data->dma_nents == 0) { |
| iser_err("dma_map_sg failed!!!\n"); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task, |
| struct iser_data_buf *data) |
| { |
| struct ib_device *dev; |
| |
| dev = iser_task->iser_conn->ib_conn.device->ib_device; |
| ib_dma_unmap_sg(dev, data->buf, data->size, DMA_FROM_DEVICE); |
| } |
| |
| static int fall_to_bounce_buf(struct iscsi_iser_task *iser_task, |
| struct ib_device *ibdev, |
| struct iser_data_buf *mem, |
| struct iser_data_buf *mem_copy, |
| enum iser_data_dir cmd_dir, |
| int aligned_len) |
| { |
| struct iscsi_conn *iscsi_conn = iser_task->iser_conn->iscsi_conn; |
| |
| iscsi_conn->fmr_unalign_cnt++; |
| iser_warn("rdma alignment violation (%d/%d aligned) or FMR not supported\n", |
| aligned_len, mem->size); |
| |
| if (iser_debug_level > 0) |
| iser_data_buf_dump(mem, ibdev); |
| |
| /* unmap the command data before accessing it */ |
| iser_dma_unmap_task_data(iser_task, mem); |
| |
| /* allocate copy buf, if we are writing, copy the */ |
| /* unaligned scatterlist, dma map the copy */ |
| if (iser_start_rdma_unaligned_sg(iser_task, mem, mem_copy, cmd_dir) != 0) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| /** |
| * iser_reg_rdma_mem_fmr - Registers memory intended for RDMA, |
| * using FMR (if possible) obtaining rkey and va |
| * |
| * returns 0 on success, errno code on failure |
| */ |
| int iser_reg_rdma_mem_fmr(struct iscsi_iser_task *iser_task, |
| enum iser_data_dir cmd_dir) |
| { |
| struct ib_conn *ib_conn = &iser_task->iser_conn->ib_conn; |
| struct iser_device *device = ib_conn->device; |
| struct ib_device *ibdev = device->ib_device; |
| struct iser_data_buf *mem = &iser_task->data[cmd_dir]; |
| struct iser_regd_buf *regd_buf; |
| int aligned_len; |
| int err; |
| int i; |
| struct scatterlist *sg; |
| |
| regd_buf = &iser_task->rdma_regd[cmd_dir]; |
| |
| aligned_len = iser_data_buf_aligned_len(mem, ibdev); |
| if (aligned_len != mem->dma_nents) { |
| err = fall_to_bounce_buf(iser_task, ibdev, mem, |
| &iser_task->data_copy[cmd_dir], |
| cmd_dir, aligned_len); |
| if (err) { |
| iser_err("failed to allocate bounce buffer\n"); |
| return err; |
| } |
| mem = &iser_task->data_copy[cmd_dir]; |
| } |
| |
| /* if there a single dma entry, FMR is not needed */ |
| if (mem->dma_nents == 1) { |
| sg = (struct scatterlist *)mem->buf; |
| |
| regd_buf->reg.lkey = device->mr->lkey; |
| regd_buf->reg.rkey = device->mr->rkey; |
| regd_buf->reg.len = ib_sg_dma_len(ibdev, &sg[0]); |
| regd_buf->reg.va = ib_sg_dma_address(ibdev, &sg[0]); |
| regd_buf->reg.is_mr = 0; |
| |
| iser_dbg("PHYSICAL Mem.register: lkey: 0x%08X rkey: 0x%08X " |
| "va: 0x%08lX sz: %ld]\n", |
| (unsigned int)regd_buf->reg.lkey, |
| (unsigned int)regd_buf->reg.rkey, |
| (unsigned long)regd_buf->reg.va, |
| (unsigned long)regd_buf->reg.len); |
| } else { /* use FMR for multiple dma entries */ |
| iser_page_vec_build(mem, ib_conn->fmr.page_vec, ibdev); |
| err = iser_reg_page_vec(ib_conn, ib_conn->fmr.page_vec, |
| ®d_buf->reg); |
| if (err && err != -EAGAIN) { |
| iser_data_buf_dump(mem, ibdev); |
| iser_err("mem->dma_nents = %d (dlength = 0x%x)\n", |
| mem->dma_nents, |
| ntoh24(iser_task->desc.iscsi_header.dlength)); |
| iser_err("page_vec: data_size = 0x%x, length = %d, offset = 0x%x\n", |
| ib_conn->fmr.page_vec->data_size, |
| ib_conn->fmr.page_vec->length, |
| ib_conn->fmr.page_vec->offset); |
| for (i = 0; i < ib_conn->fmr.page_vec->length; i++) |
| iser_err("page_vec[%d] = 0x%llx\n", i, |
| (unsigned long long)ib_conn->fmr.page_vec->pages[i]); |
| } |
| if (err) |
| return err; |
| } |
| return 0; |
| } |
| |
| static inline void |
| iser_set_dif_domain(struct scsi_cmnd *sc, struct ib_sig_attrs *sig_attrs, |
| struct ib_sig_domain *domain) |
| { |
| domain->sig_type = IB_SIG_TYPE_T10_DIF; |
| domain->sig.dif.pi_interval = sc->device->sector_size; |
| domain->sig.dif.ref_tag = scsi_get_lba(sc) & 0xffffffff; |
| /* |
| * At the moment we hard code those, but in the future |
| * we will take them from sc. |
| */ |
| domain->sig.dif.apptag_check_mask = 0xffff; |
| domain->sig.dif.app_escape = true; |
| domain->sig.dif.ref_escape = true; |
| if (scsi_get_prot_type(sc) == SCSI_PROT_DIF_TYPE1 || |
| scsi_get_prot_type(sc) == SCSI_PROT_DIF_TYPE2) |
| domain->sig.dif.ref_remap = true; |
| }; |
| |
| static int |
| iser_set_sig_attrs(struct scsi_cmnd *sc, struct ib_sig_attrs *sig_attrs) |
| { |
| switch (scsi_get_prot_op(sc)) { |
| case SCSI_PROT_WRITE_INSERT: |
| case SCSI_PROT_READ_STRIP: |
| sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE; |
| iser_set_dif_domain(sc, sig_attrs, &sig_attrs->wire); |
| sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC; |
| break; |
| case SCSI_PROT_READ_INSERT: |
| case SCSI_PROT_WRITE_STRIP: |
| sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE; |
| iser_set_dif_domain(sc, sig_attrs, &sig_attrs->mem); |
| /* |
| * At the moment we use this modparam to tell what is |
| * the memory bg_type, in the future we will take it |
| * from sc. |
| */ |
| sig_attrs->mem.sig.dif.bg_type = iser_pi_guard ? IB_T10DIF_CSUM : |
| IB_T10DIF_CRC; |
| break; |
| case SCSI_PROT_READ_PASS: |
| case SCSI_PROT_WRITE_PASS: |
| iser_set_dif_domain(sc, sig_attrs, &sig_attrs->wire); |
| sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC; |
| iser_set_dif_domain(sc, sig_attrs, &sig_attrs->mem); |
| /* |
| * At the moment we use this modparam to tell what is |
| * the memory bg_type, in the future we will take it |
| * from sc. |
| */ |
| sig_attrs->mem.sig.dif.bg_type = iser_pi_guard ? IB_T10DIF_CSUM : |
| IB_T10DIF_CRC; |
| break; |
| default: |
| iser_err("Unsupported PI operation %d\n", |
| scsi_get_prot_op(sc)); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int |
| iser_set_prot_checks(struct scsi_cmnd *sc, u8 *mask) |
| { |
| switch (scsi_get_prot_type(sc)) { |
| case SCSI_PROT_DIF_TYPE0: |
| break; |
| case SCSI_PROT_DIF_TYPE1: |
| case SCSI_PROT_DIF_TYPE2: |
| *mask = ISER_CHECK_GUARD | ISER_CHECK_REFTAG; |
| break; |
| case SCSI_PROT_DIF_TYPE3: |
| *mask = ISER_CHECK_GUARD; |
| break; |
| default: |
| iser_err("Unsupported protection type %d\n", |
| scsi_get_prot_type(sc)); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int |
| iser_reg_sig_mr(struct iscsi_iser_task *iser_task, |
| struct fast_reg_descriptor *desc, struct ib_sge *data_sge, |
| struct ib_sge *prot_sge, struct ib_sge *sig_sge) |
| { |
| struct ib_conn *ib_conn = &iser_task->iser_conn->ib_conn; |
| struct iser_pi_context *pi_ctx = desc->pi_ctx; |
| struct ib_send_wr sig_wr, inv_wr; |
| struct ib_send_wr *bad_wr, *wr = NULL; |
| struct ib_sig_attrs sig_attrs; |
| int ret; |
| u32 key; |
| |
| memset(&sig_attrs, 0, sizeof(sig_attrs)); |
| ret = iser_set_sig_attrs(iser_task->sc, &sig_attrs); |
| if (ret) |
| goto err; |
| |
| ret = iser_set_prot_checks(iser_task->sc, &sig_attrs.check_mask); |
| if (ret) |
| goto err; |
| |
| if (!(desc->reg_indicators & ISER_SIG_KEY_VALID)) { |
| memset(&inv_wr, 0, sizeof(inv_wr)); |
| inv_wr.opcode = IB_WR_LOCAL_INV; |
| inv_wr.wr_id = ISER_FASTREG_LI_WRID; |
| inv_wr.ex.invalidate_rkey = pi_ctx->sig_mr->rkey; |
| wr = &inv_wr; |
| /* Bump the key */ |
| key = (u8)(pi_ctx->sig_mr->rkey & 0x000000FF); |
| ib_update_fast_reg_key(pi_ctx->sig_mr, ++key); |
| } |
| |
| memset(&sig_wr, 0, sizeof(sig_wr)); |
| sig_wr.opcode = IB_WR_REG_SIG_MR; |
| sig_wr.wr_id = ISER_FASTREG_LI_WRID; |
| sig_wr.sg_list = data_sge; |
| sig_wr.num_sge = 1; |
| sig_wr.wr.sig_handover.sig_attrs = &sig_attrs; |
| sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr; |
| if (scsi_prot_sg_count(iser_task->sc)) |
| sig_wr.wr.sig_handover.prot = prot_sge; |
| sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE | |
| IB_ACCESS_REMOTE_READ | |
| IB_ACCESS_REMOTE_WRITE; |
| |
| if (!wr) |
| wr = &sig_wr; |
| else |
| wr->next = &sig_wr; |
| |
| ret = ib_post_send(ib_conn->qp, wr, &bad_wr); |
| if (ret) { |
| iser_err("reg_sig_mr failed, ret:%d\n", ret); |
| goto err; |
| } |
| desc->reg_indicators &= ~ISER_SIG_KEY_VALID; |
| |
| sig_sge->lkey = pi_ctx->sig_mr->lkey; |
| sig_sge->addr = 0; |
| sig_sge->length = data_sge->length + prot_sge->length; |
| if (scsi_get_prot_op(iser_task->sc) == SCSI_PROT_WRITE_INSERT || |
| scsi_get_prot_op(iser_task->sc) == SCSI_PROT_READ_STRIP) { |
| sig_sge->length += (data_sge->length / |
| iser_task->sc->device->sector_size) * 8; |
| } |
| |
| iser_dbg("sig_sge: addr: 0x%llx length: %u lkey: 0x%x\n", |
| sig_sge->addr, sig_sge->length, |
| sig_sge->lkey); |
| err: |
| return ret; |
| } |
| |
| static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task, |
| struct iser_regd_buf *regd_buf, |
| struct iser_data_buf *mem, |
| enum iser_reg_indicator ind, |
| struct ib_sge *sge) |
| { |
| struct fast_reg_descriptor *desc = regd_buf->reg.mem_h; |
| struct ib_conn *ib_conn = &iser_task->iser_conn->ib_conn; |
| struct iser_device *device = ib_conn->device; |
| struct ib_device *ibdev = device->ib_device; |
| struct ib_mr *mr; |
| struct ib_fast_reg_page_list *frpl; |
| struct ib_send_wr fastreg_wr, inv_wr; |
| struct ib_send_wr *bad_wr, *wr = NULL; |
| u8 key; |
| int ret, offset, size, plen; |
| |
| /* if there a single dma entry, dma mr suffices */ |
| if (mem->dma_nents == 1) { |
| struct scatterlist *sg = (struct scatterlist *)mem->buf; |
| |
| sge->lkey = device->mr->lkey; |
| sge->addr = ib_sg_dma_address(ibdev, &sg[0]); |
| sge->length = ib_sg_dma_len(ibdev, &sg[0]); |
| |
| iser_dbg("Single DMA entry: lkey=0x%x, addr=0x%llx, length=0x%x\n", |
| sge->lkey, sge->addr, sge->length); |
| return 0; |
| } |
| |
| if (ind == ISER_DATA_KEY_VALID) { |
| mr = desc->data_mr; |
| frpl = desc->data_frpl; |
| } else { |
| mr = desc->pi_ctx->prot_mr; |
| frpl = desc->pi_ctx->prot_frpl; |
| } |
| |
| plen = iser_sg_to_page_vec(mem, device->ib_device, frpl->page_list, |
| &offset, &size); |
| if (plen * SIZE_4K < size) { |
| iser_err("fast reg page_list too short to hold this SG\n"); |
| return -EINVAL; |
| } |
| |
| if (!(desc->reg_indicators & ind)) { |
| memset(&inv_wr, 0, sizeof(inv_wr)); |
| inv_wr.wr_id = ISER_FASTREG_LI_WRID; |
| inv_wr.opcode = IB_WR_LOCAL_INV; |
| inv_wr.ex.invalidate_rkey = mr->rkey; |
| wr = &inv_wr; |
| /* Bump the key */ |
| key = (u8)(mr->rkey & 0x000000FF); |
| ib_update_fast_reg_key(mr, ++key); |
| } |
| |
| /* Prepare FASTREG WR */ |
| memset(&fastreg_wr, 0, sizeof(fastreg_wr)); |
| fastreg_wr.wr_id = ISER_FASTREG_LI_WRID; |
| fastreg_wr.opcode = IB_WR_FAST_REG_MR; |
| fastreg_wr.wr.fast_reg.iova_start = frpl->page_list[0] + offset; |
| fastreg_wr.wr.fast_reg.page_list = frpl; |
| fastreg_wr.wr.fast_reg.page_list_len = plen; |
| fastreg_wr.wr.fast_reg.page_shift = SHIFT_4K; |
| fastreg_wr.wr.fast_reg.length = size; |
| fastreg_wr.wr.fast_reg.rkey = mr->rkey; |
| fastreg_wr.wr.fast_reg.access_flags = (IB_ACCESS_LOCAL_WRITE | |
| IB_ACCESS_REMOTE_WRITE | |
| IB_ACCESS_REMOTE_READ); |
| |
| if (!wr) |
| wr = &fastreg_wr; |
| else |
| wr->next = &fastreg_wr; |
| |
| ret = ib_post_send(ib_conn->qp, wr, &bad_wr); |
| if (ret) { |
| iser_err("fast registration failed, ret:%d\n", ret); |
| return ret; |
| } |
| desc->reg_indicators &= ~ind; |
| |
| sge->lkey = mr->lkey; |
| sge->addr = frpl->page_list[0] + offset; |
| sge->length = size; |
| |
| return ret; |
| } |
| |
| /** |
| * iser_reg_rdma_mem_fastreg - Registers memory intended for RDMA, |
| * using Fast Registration WR (if possible) obtaining rkey and va |
| * |
| * returns 0 on success, errno code on failure |
| */ |
| int iser_reg_rdma_mem_fastreg(struct iscsi_iser_task *iser_task, |
| enum iser_data_dir cmd_dir) |
| { |
| struct ib_conn *ib_conn = &iser_task->iser_conn->ib_conn; |
| struct iser_device *device = ib_conn->device; |
| struct ib_device *ibdev = device->ib_device; |
| struct iser_data_buf *mem = &iser_task->data[cmd_dir]; |
| struct iser_regd_buf *regd_buf = &iser_task->rdma_regd[cmd_dir]; |
| struct fast_reg_descriptor *desc = NULL; |
| struct ib_sge data_sge; |
| int err, aligned_len; |
| unsigned long flags; |
| |
| aligned_len = iser_data_buf_aligned_len(mem, ibdev); |
| if (aligned_len != mem->dma_nents) { |
| err = fall_to_bounce_buf(iser_task, ibdev, mem, |
| &iser_task->data_copy[cmd_dir], |
| cmd_dir, aligned_len); |
| if (err) { |
| iser_err("failed to allocate bounce buffer\n"); |
| return err; |
| } |
| mem = &iser_task->data_copy[cmd_dir]; |
| } |
| |
| if (mem->dma_nents != 1 || |
| scsi_get_prot_op(iser_task->sc) != SCSI_PROT_NORMAL) { |
| spin_lock_irqsave(&ib_conn->lock, flags); |
| desc = list_first_entry(&ib_conn->fastreg.pool, |
| struct fast_reg_descriptor, list); |
| list_del(&desc->list); |
| spin_unlock_irqrestore(&ib_conn->lock, flags); |
| regd_buf->reg.mem_h = desc; |
| } |
| |
| err = iser_fast_reg_mr(iser_task, regd_buf, mem, |
| ISER_DATA_KEY_VALID, &data_sge); |
| if (err) |
| goto err_reg; |
| |
| if (scsi_get_prot_op(iser_task->sc) != SCSI_PROT_NORMAL) { |
| struct ib_sge prot_sge, sig_sge; |
| |
| memset(&prot_sge, 0, sizeof(prot_sge)); |
| if (scsi_prot_sg_count(iser_task->sc)) { |
| mem = &iser_task->prot[cmd_dir]; |
| aligned_len = iser_data_buf_aligned_len(mem, ibdev); |
| if (aligned_len != mem->dma_nents) { |
| err = fall_to_bounce_buf(iser_task, ibdev, mem, |
| &iser_task->prot_copy[cmd_dir], |
| cmd_dir, aligned_len); |
| if (err) { |
| iser_err("failed to allocate bounce buffer\n"); |
| return err; |
| } |
| mem = &iser_task->prot_copy[cmd_dir]; |
| } |
| |
| err = iser_fast_reg_mr(iser_task, regd_buf, mem, |
| ISER_PROT_KEY_VALID, &prot_sge); |
| if (err) |
| goto err_reg; |
| } |
| |
| err = iser_reg_sig_mr(iser_task, desc, &data_sge, |
| &prot_sge, &sig_sge); |
| if (err) { |
| iser_err("Failed to register signature mr\n"); |
| return err; |
| } |
| desc->reg_indicators |= ISER_FASTREG_PROTECTED; |
| |
| regd_buf->reg.lkey = sig_sge.lkey; |
| regd_buf->reg.rkey = desc->pi_ctx->sig_mr->rkey; |
| regd_buf->reg.va = sig_sge.addr; |
| regd_buf->reg.len = sig_sge.length; |
| regd_buf->reg.is_mr = 1; |
| } else { |
| if (desc) { |
| regd_buf->reg.rkey = desc->data_mr->rkey; |
| regd_buf->reg.is_mr = 1; |
| } else { |
| regd_buf->reg.rkey = device->mr->rkey; |
| regd_buf->reg.is_mr = 0; |
| } |
| |
| regd_buf->reg.lkey = data_sge.lkey; |
| regd_buf->reg.va = data_sge.addr; |
| regd_buf->reg.len = data_sge.length; |
| } |
| |
| return 0; |
| err_reg: |
| if (desc) { |
| spin_lock_irqsave(&ib_conn->lock, flags); |
| list_add_tail(&desc->list, &ib_conn->fastreg.pool); |
| spin_unlock_irqrestore(&ib_conn->lock, flags); |
| } |
| |
| return err; |
| } |