Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 422 insertions, 0 deletions

diff --git a/drivers/infiniband/ulp/iser/iser_memory.c b/drivers/infiniband/ulp/iser/iser_memory.c
new file mode 100644
index 00000000..2033a928
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/iser_memory.c
@@ -0,0 +1,422 @@
+/*
+ * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. 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,
+					enum iser_data_dir cmd_dir)
+{
+	int dma_nents;
+	struct ib_device *dev;
+	char *mem = NULL;
+	struct iser_data_buf *data = &iser_task->data[cmd_dir];
+	unsigned long  cmd_data_len = data->data_len;
+
+	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 */
+		struct scatterlist *sgl = (struct scatterlist *)data->buf;
+		struct scatterlist *sg;
+		int i;
+		char *p, *from;
+
+		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(&iser_task->data_copy[cmd_dir].sg_single, mem, cmd_data_len);
+	iser_task->data_copy[cmd_dir].buf  =
+		&iser_task->data_copy[cmd_dir].sg_single;
+	iser_task->data_copy[cmd_dir].size = 1;
+
+	iser_task->data_copy[cmd_dir].copy_buf  = mem;
+
+	dev = iser_task->iser_conn->ib_conn->device->ib_device;
+	dma_nents = ib_dma_map_sg(dev,
+				  &iser_task->data_copy[cmd_dir].sg_single,
+				  1,
+				  (cmd_dir == ISER_DIR_OUT) ?
+				  DMA_TO_DEVICE : DMA_FROM_DEVICE);
+	BUG_ON(dma_nents == 0);
+
+	iser_task->data_copy[cmd_dir].dma_nents = dma_nents;
+	return 0;
+}
+
+/**
+ * iser_finalize_rdma_unaligned_sg
+ */
+void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
+				     enum iser_data_dir         cmd_dir)
+{
+	struct ib_device *dev;
+	struct iser_data_buf *mem_copy;
+	unsigned long  cmd_data_len;
+
+	dev = iser_task->iser_conn->ib_conn->device->ib_device;
+	mem_copy = &iser_task->data_copy[cmd_dir];
+
+	ib_dma_unmap_sg(dev, &mem_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	= mem_copy->copy_buf;
+
+		sgl	= (struct scatterlist *)iser_task->data[ISER_DIR_IN].buf;
+		sg_size = iser_task->data[ISER_DIR_IN].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 = iser_task->data[cmd_dir].data_len;
+
+	if (cmd_data_len > ISER_KMALLOC_THRESHOLD)
+		free_pages((unsigned long)mem_copy->copy_buf,
+			   ilog2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT);
+	else
+		kfree(mem_copy->copy_buf);
+
+	mem_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 iser_page_vec *page_vec,
+			       struct ib_device *ibdev)
+{
+	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 */
+	page_vec->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 {
+			page_vec->pages[cur_page++] = page;
+			page += SIZE_4K;
+		} while (page < end_addr);
+	}
+
+	page_vec->data_size = total_sz;
+	iser_dbg("page_vec->data_size:%d cur_page %d\n", page_vec->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;
+
+	if (iser_debug_level == 0)
+		return;
+
+	for_each_sg(sgl, sg, data->dma_nents, i)
+		iser_warn("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, page_vec, ibdev);
+	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 ib_device *dev;
+	struct iser_data_buf *data;
+
+	dev = iser_task->iser_conn->ib_conn->device->ib_device;
+
+	if (iser_task->dir[ISER_DIR_IN]) {
+		data = &iser_task->data[ISER_DIR_IN];
+		ib_dma_unmap_sg(dev, data->buf, data->size, DMA_FROM_DEVICE);
+	}
+
+	if (iser_task->dir[ISER_DIR_OUT]) {
+		data = &iser_task->data[ISER_DIR_OUT];
+		ib_dma_unmap_sg(dev, data->buf, data->size, DMA_TO_DEVICE);
+	}
+}
+
+/**
+ * iser_reg_rdma_mem - Registers memory intended for RDMA,
+ * obtaining rkey and va
+ *
+ * returns 0 on success, errno code on failure
+ */
+int iser_reg_rdma_mem(struct iscsi_iser_task *iser_task,
+		      enum   iser_data_dir        cmd_dir)
+{
+	struct iscsi_conn    *iscsi_conn = iser_task->iser_conn->iscsi_conn;
+	struct iser_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) {
+		iscsi_conn->fmr_unalign_cnt++;
+		iser_warn("rdma alignment violation %d/%d aligned\n",
+			 aligned_len, mem->size);
+		iser_data_buf_dump(mem, ibdev);
+
+		/* unmap the command data before accessing it */
+		iser_dma_unmap_task_data(iser_task);
+
+		/* allocate copy buf, if we are writing, copy the */
+		/* unaligned scatterlist, dma map the copy        */
+		if (iser_start_rdma_unaligned_sg(iser_task, cmd_dir) != 0)
+				return -ENOMEM;
+		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_fmr = 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->page_vec, ibdev);
+		err = iser_reg_page_vec(ib_conn, ib_conn->page_vec, &regd_buf->reg);
+		if (err) {
+			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->page_vec->data_size, ib_conn->page_vec->length,
+				 ib_conn->page_vec->offset);
+			for (i=0 ; i<ib_conn->page_vec->length ; i++)
+				iser_err("page_vec[%d] = 0x%llx\n", i,
+					 (unsigned long long) ib_conn->page_vec->pages[i]);
+			return err;
+		}
+	}
+	return 0;
+}