425 lines
12 KiB
C
425 lines
12 KiB
C
/*
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* Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/highmem.h>
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#include <linux/scatterlist.h>
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#include "iscsi_iser.h"
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#define ISER_KMALLOC_THRESHOLD 0x20000 /* 128K - kmalloc limit */
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/**
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* iser_start_rdma_unaligned_sg
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*/
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static int iser_start_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
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enum iser_data_dir cmd_dir)
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{
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int dma_nents;
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struct ib_device *dev;
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char *mem = NULL;
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struct iser_data_buf *data = &iser_task->data[cmd_dir];
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unsigned long cmd_data_len = data->data_len;
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if (cmd_data_len > ISER_KMALLOC_THRESHOLD)
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mem = (void *)__get_free_pages(GFP_ATOMIC,
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ilog2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT);
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else
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mem = kmalloc(cmd_data_len, GFP_ATOMIC);
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if (mem == NULL) {
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iser_err("Failed to allocate mem size %d %d for copying sglist\n",
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data->size,(int)cmd_data_len);
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return -ENOMEM;
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}
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if (cmd_dir == ISER_DIR_OUT) {
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/* copy the unaligned sg the buffer which is used for RDMA */
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struct scatterlist *sgl = (struct scatterlist *)data->buf;
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struct scatterlist *sg;
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int i;
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char *p, *from;
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p = mem;
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for_each_sg(sgl, sg, data->size, i) {
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from = kmap_atomic(sg_page(sg));
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memcpy(p,
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from + sg->offset,
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sg->length);
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kunmap_atomic(from);
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p += sg->length;
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}
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}
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sg_init_one(&iser_task->data_copy[cmd_dir].sg_single, mem, cmd_data_len);
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iser_task->data_copy[cmd_dir].buf =
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&iser_task->data_copy[cmd_dir].sg_single;
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iser_task->data_copy[cmd_dir].size = 1;
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iser_task->data_copy[cmd_dir].copy_buf = mem;
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dev = iser_task->iser_conn->ib_conn->device->ib_device;
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dma_nents = ib_dma_map_sg(dev,
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&iser_task->data_copy[cmd_dir].sg_single,
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1,
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(cmd_dir == ISER_DIR_OUT) ?
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DMA_TO_DEVICE : DMA_FROM_DEVICE);
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BUG_ON(dma_nents == 0);
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iser_task->data_copy[cmd_dir].dma_nents = dma_nents;
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return 0;
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}
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/**
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* iser_finalize_rdma_unaligned_sg
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*/
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void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
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enum iser_data_dir cmd_dir)
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{
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struct ib_device *dev;
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struct iser_data_buf *mem_copy;
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unsigned long cmd_data_len;
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dev = iser_task->iser_conn->ib_conn->device->ib_device;
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mem_copy = &iser_task->data_copy[cmd_dir];
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ib_dma_unmap_sg(dev, &mem_copy->sg_single, 1,
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(cmd_dir == ISER_DIR_OUT) ?
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DMA_TO_DEVICE : DMA_FROM_DEVICE);
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if (cmd_dir == ISER_DIR_IN) {
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char *mem;
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struct scatterlist *sgl, *sg;
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unsigned char *p, *to;
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unsigned int sg_size;
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int i;
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/* copy back read RDMA to unaligned sg */
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mem = mem_copy->copy_buf;
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sgl = (struct scatterlist *)iser_task->data[ISER_DIR_IN].buf;
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sg_size = iser_task->data[ISER_DIR_IN].size;
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p = mem;
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for_each_sg(sgl, sg, sg_size, i) {
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to = kmap_atomic(sg_page(sg));
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memcpy(to + sg->offset,
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p,
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sg->length);
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kunmap_atomic(to);
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p += sg->length;
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}
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}
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cmd_data_len = iser_task->data[cmd_dir].data_len;
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if (cmd_data_len > ISER_KMALLOC_THRESHOLD)
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free_pages((unsigned long)mem_copy->copy_buf,
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ilog2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT);
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else
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kfree(mem_copy->copy_buf);
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mem_copy->copy_buf = NULL;
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}
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#define IS_4K_ALIGNED(addr) ((((unsigned long)addr) & ~MASK_4K) == 0)
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/**
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* iser_sg_to_page_vec - Translates scatterlist entries to physical addresses
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* and returns the length of resulting physical address array (may be less than
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* the original due to possible compaction).
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*
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* we build a "page vec" under the assumption that the SG meets the RDMA
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* alignment requirements. Other then the first and last SG elements, all
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* the "internal" elements can be compacted into a list whose elements are
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* dma addresses of physical pages. The code supports also the weird case
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* where --few fragments of the same page-- are present in the SG as
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* consecutive elements. Also, it handles one entry SG.
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*/
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static int iser_sg_to_page_vec(struct iser_data_buf *data,
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struct iser_page_vec *page_vec,
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struct ib_device *ibdev)
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{
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struct scatterlist *sg, *sgl = (struct scatterlist *)data->buf;
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u64 start_addr, end_addr, page, chunk_start = 0;
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unsigned long total_sz = 0;
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unsigned int dma_len;
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int i, new_chunk, cur_page, last_ent = data->dma_nents - 1;
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/* compute the offset of first element */
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page_vec->offset = (u64) sgl[0].offset & ~MASK_4K;
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new_chunk = 1;
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cur_page = 0;
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for_each_sg(sgl, sg, data->dma_nents, i) {
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start_addr = ib_sg_dma_address(ibdev, sg);
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if (new_chunk)
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chunk_start = start_addr;
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dma_len = ib_sg_dma_len(ibdev, sg);
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end_addr = start_addr + dma_len;
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total_sz += dma_len;
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/* collect page fragments until aligned or end of SG list */
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if (!IS_4K_ALIGNED(end_addr) && i < last_ent) {
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new_chunk = 0;
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continue;
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}
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new_chunk = 1;
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/* address of the first page in the contiguous chunk;
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masking relevant for the very first SG entry,
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which might be unaligned */
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page = chunk_start & MASK_4K;
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do {
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page_vec->pages[cur_page++] = page;
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page += SIZE_4K;
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} while (page < end_addr);
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}
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page_vec->data_size = total_sz;
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iser_dbg("page_vec->data_size:%d cur_page %d\n", page_vec->data_size,cur_page);
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return cur_page;
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}
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/**
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* iser_data_buf_aligned_len - Tries to determine the maximal correctly aligned
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* for RDMA sub-list of a scatter-gather list of memory buffers, and returns
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* the number of entries which are aligned correctly. Supports the case where
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* consecutive SG elements are actually fragments of the same physcial page.
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*/
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static int iser_data_buf_aligned_len(struct iser_data_buf *data,
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struct ib_device *ibdev)
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{
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struct scatterlist *sgl, *sg, *next_sg = NULL;
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u64 start_addr, end_addr;
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int i, ret_len, start_check = 0;
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if (data->dma_nents == 1)
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return 1;
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sgl = (struct scatterlist *)data->buf;
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start_addr = ib_sg_dma_address(ibdev, sgl);
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for_each_sg(sgl, sg, data->dma_nents, i) {
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if (start_check && !IS_4K_ALIGNED(start_addr))
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break;
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next_sg = sg_next(sg);
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if (!next_sg)
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break;
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end_addr = start_addr + ib_sg_dma_len(ibdev, sg);
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start_addr = ib_sg_dma_address(ibdev, next_sg);
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if (end_addr == start_addr) {
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start_check = 0;
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continue;
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} else
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start_check = 1;
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if (!IS_4K_ALIGNED(end_addr))
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break;
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}
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ret_len = (next_sg) ? i : i+1;
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iser_dbg("Found %d aligned entries out of %d in sg:0x%p\n",
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ret_len, data->dma_nents, data);
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return ret_len;
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}
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static void iser_data_buf_dump(struct iser_data_buf *data,
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struct ib_device *ibdev)
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{
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struct scatterlist *sgl = (struct scatterlist *)data->buf;
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struct scatterlist *sg;
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int i;
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if (iser_debug_level == 0)
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return;
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for_each_sg(sgl, sg, data->dma_nents, i)
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iser_warn("sg[%d] dma_addr:0x%lX page:0x%p "
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"off:0x%x sz:0x%x dma_len:0x%x\n",
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i, (unsigned long)ib_sg_dma_address(ibdev, sg),
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sg_page(sg), sg->offset,
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sg->length, ib_sg_dma_len(ibdev, sg));
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}
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static void iser_dump_page_vec(struct iser_page_vec *page_vec)
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{
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int i;
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iser_err("page vec length %d data size %d\n",
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page_vec->length, page_vec->data_size);
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for (i = 0; i < page_vec->length; i++)
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iser_err("%d %lx\n",i,(unsigned long)page_vec->pages[i]);
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}
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static void iser_page_vec_build(struct iser_data_buf *data,
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struct iser_page_vec *page_vec,
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struct ib_device *ibdev)
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{
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int page_vec_len = 0;
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page_vec->length = 0;
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page_vec->offset = 0;
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iser_dbg("Translating sg sz: %d\n", data->dma_nents);
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page_vec_len = iser_sg_to_page_vec(data, page_vec, ibdev);
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iser_dbg("sg len %d page_vec_len %d\n", data->dma_nents,page_vec_len);
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page_vec->length = page_vec_len;
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if (page_vec_len * SIZE_4K < page_vec->data_size) {
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iser_err("page_vec too short to hold this SG\n");
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iser_data_buf_dump(data, ibdev);
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iser_dump_page_vec(page_vec);
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BUG();
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}
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}
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int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
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struct iser_data_buf *data,
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enum iser_data_dir iser_dir,
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enum dma_data_direction dma_dir)
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{
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struct ib_device *dev;
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iser_task->dir[iser_dir] = 1;
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dev = iser_task->iser_conn->ib_conn->device->ib_device;
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data->dma_nents = ib_dma_map_sg(dev, data->buf, data->size, dma_dir);
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if (data->dma_nents == 0) {
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iser_err("dma_map_sg failed!!!\n");
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return -EINVAL;
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}
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return 0;
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}
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void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task)
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{
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struct ib_device *dev;
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struct iser_data_buf *data;
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dev = iser_task->iser_conn->ib_conn->device->ib_device;
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if (iser_task->dir[ISER_DIR_IN]) {
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data = &iser_task->data[ISER_DIR_IN];
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ib_dma_unmap_sg(dev, data->buf, data->size, DMA_FROM_DEVICE);
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}
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if (iser_task->dir[ISER_DIR_OUT]) {
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data = &iser_task->data[ISER_DIR_OUT];
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ib_dma_unmap_sg(dev, data->buf, data->size, DMA_TO_DEVICE);
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}
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}
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/**
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* iser_reg_rdma_mem - Registers memory intended for RDMA,
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* obtaining rkey and va
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*
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* returns 0 on success, errno code on failure
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*/
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int iser_reg_rdma_mem(struct iscsi_iser_task *iser_task,
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enum iser_data_dir cmd_dir)
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{
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struct iscsi_conn *iscsi_conn = iser_task->iser_conn->iscsi_conn;
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struct iser_conn *ib_conn = iser_task->iser_conn->ib_conn;
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struct iser_device *device = ib_conn->device;
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struct ib_device *ibdev = device->ib_device;
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struct iser_data_buf *mem = &iser_task->data[cmd_dir];
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struct iser_regd_buf *regd_buf;
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int aligned_len;
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int err;
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int i;
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struct scatterlist *sg;
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regd_buf = &iser_task->rdma_regd[cmd_dir];
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aligned_len = iser_data_buf_aligned_len(mem, ibdev);
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if (aligned_len != mem->dma_nents ||
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(!ib_conn->fmr_pool && mem->dma_nents > 1)) {
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iscsi_conn->fmr_unalign_cnt++;
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iser_warn("rdma alignment violation (%d/%d aligned) or FMR not supported\n",
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aligned_len, mem->size);
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iser_data_buf_dump(mem, ibdev);
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/* unmap the command data before accessing it */
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iser_dma_unmap_task_data(iser_task);
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/* allocate copy buf, if we are writing, copy the */
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/* unaligned scatterlist, dma map the copy */
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if (iser_start_rdma_unaligned_sg(iser_task, cmd_dir) != 0)
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return -ENOMEM;
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mem = &iser_task->data_copy[cmd_dir];
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}
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/* if there a single dma entry, FMR is not needed */
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if (mem->dma_nents == 1) {
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sg = (struct scatterlist *)mem->buf;
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regd_buf->reg.lkey = device->mr->lkey;
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regd_buf->reg.rkey = device->mr->rkey;
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regd_buf->reg.len = ib_sg_dma_len(ibdev, &sg[0]);
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regd_buf->reg.va = ib_sg_dma_address(ibdev, &sg[0]);
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regd_buf->reg.is_fmr = 0;
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iser_dbg("PHYSICAL Mem.register: lkey: 0x%08X rkey: 0x%08X "
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"va: 0x%08lX sz: %ld]\n",
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(unsigned int)regd_buf->reg.lkey,
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(unsigned int)regd_buf->reg.rkey,
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(unsigned long)regd_buf->reg.va,
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(unsigned long)regd_buf->reg.len);
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} else { /* use FMR for multiple dma entries */
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iser_page_vec_build(mem, ib_conn->page_vec, ibdev);
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err = iser_reg_page_vec(ib_conn, ib_conn->page_vec, ®d_buf->reg);
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if (err && err != -EAGAIN) {
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iser_data_buf_dump(mem, ibdev);
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iser_err("mem->dma_nents = %d (dlength = 0x%x)\n",
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mem->dma_nents,
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ntoh24(iser_task->desc.iscsi_header.dlength));
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iser_err("page_vec: data_size = 0x%x, length = %d, offset = 0x%x\n",
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ib_conn->page_vec->data_size, ib_conn->page_vec->length,
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ib_conn->page_vec->offset);
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for (i=0 ; i<ib_conn->page_vec->length ; i++)
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iser_err("page_vec[%d] = 0x%llx\n", i,
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(unsigned long long) ib_conn->page_vec->pages[i]);
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}
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if (err)
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return err;
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}
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return 0;
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}
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