target: misc ramdisk backend cleanups

Remove various leftovers of the old direct/indirect split, as well as the
unused rd_request structure and a couple unused defines and fields.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NNicholas Bellinger <nab@linux-iscsi.org>

drivers/target/target_core_rd.c

@@ -199,10 +199,7 @@ static int rd_build_device_space(struct rd_dev *rd_dev)
 	return 0;
 }
 
-static void *rd_allocate_virtdevice(
-	struct se_hba *hba,
-	const char *name,
-	int rd_direct)
+static void *rd_allocate_virtdevice(struct se_hba *hba, const char *name)
 {
 	struct rd_dev *rd_dev;
 	struct rd_host *rd_host = hba->hba_ptr;
@@ -214,25 +211,12 @@ static void *rd_allocate_virtdevice(
 	}
 
 	rd_dev->rd_host = rd_host;
-	rd_dev->rd_direct = rd_direct;
 
 	return rd_dev;
 }
 
-static void *rd_MEMCPY_allocate_virtdevice(struct se_hba *hba, const char *name)
-{
-	return rd_allocate_virtdevice(hba, name, 0);
-}
-
-/*	rd_create_virtdevice():
- *
- *
- */
-static struct se_device *rd_create_virtdevice(
-	struct se_hba *hba,
-	struct se_subsystem_dev *se_dev,
-	void *p,
-	int rd_direct)
+static struct se_device *rd_create_virtdevice(struct se_hba *hba,
+		struct se_subsystem_dev *se_dev, void *p)
 {
 	struct se_device *dev;
 	struct se_dev_limits dev_limits;
@@ -247,9 +231,8 @@ static struct se_device *rd_create_virtdevice(
 	if (ret < 0)
 		goto fail;
 
-	snprintf(prod, 16, "RAMDISK-%s", (rd_dev->rd_direct) ? "DR" : "MCP");
-	snprintf(rev, 4, "%s", (rd_dev->rd_direct) ? RD_DR_VERSION :
-						RD_MCP_VERSION);
+	snprintf(prod, 16, "RAMDISK-MCP");
+	snprintf(rev, 4, "%s", RD_MCP_VERSION);
 
 	dev_limits.limits.logical_block_size = RD_BLOCKSIZE;
 	dev_limits.limits.max_hw_sectors = RD_MAX_SECTORS;
@@ -264,12 +247,10 @@ static struct se_device *rd_create_virtdevice(
 		goto fail;
 
 	rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++;
-	rd_dev->rd_queue_depth = dev->queue_depth;
 
-	pr_debug("CORE_RD[%u] - Added TCM %s Ramdisk Device ID: %u of"
+	pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of"
 		" %u pages in %u tables, %lu total bytes\n",
-		rd_host->rd_host_id, (!rd_dev->rd_direct) ? "MEMCPY" :
-		"DIRECT", rd_dev->rd_dev_id, rd_dev->rd_page_count,
+		rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count,
 		rd_dev->sg_table_count,
 		(unsigned long)(rd_dev->rd_page_count * PAGE_SIZE));
 
@@ -280,18 +261,6 @@ static struct se_device *rd_create_virtdevice(
 	return ERR_PTR(ret);
 }
 
-static struct se_device *rd_MEMCPY_create_virtdevice(
-	struct se_hba *hba,
-	struct se_subsystem_dev *se_dev,
-	void *p)
-{
-	return rd_create_virtdevice(hba, se_dev, p, 0);
-}
-
-/*	rd_free_device(): (Part of se_subsystem_api_t template)
- *
- *
- */
 static void rd_free_device(void *p)
 {
 	struct rd_dev *rd_dev = p;
@@ -300,29 +269,12 @@ static void rd_free_device(void *p)
 	kfree(rd_dev);
 }
 
-static inline struct rd_request *RD_REQ(struct se_task *task)
-{
-	return container_of(task, struct rd_request, rd_task);
-}
-
 static struct se_task *
 rd_alloc_task(unsigned char *cdb)
 {
-	struct rd_request *rd_req;
-
-	rd_req = kzalloc(sizeof(struct rd_request), GFP_KERNEL);
-	if (!rd_req) {
-		pr_err("Unable to allocate struct rd_request\n");
-		return NULL;
-	}
-
-	return &rd_req->rd_task;
+	return kzalloc(sizeof(struct se_task), GFP_KERNEL);
 }
 
-/*	rd_get_sg_table():
- *
- *
- */
 static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page)
 {
 	u32 i;
@@ -341,31 +293,41 @@ static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page)
 	return NULL;
 }
 
-static int rd_MEMCPY(struct rd_request *req, u32 read_rd)
+static int rd_do_task(struct se_task *task)
 {
-	struct se_task *task = &req->rd_task;
-	struct rd_dev *dev = req->rd_task.task_se_cmd->se_dev->dev_ptr;
+	struct se_device *se_dev = task->task_se_cmd->se_dev;
+	struct rd_dev *dev = se_dev->dev_ptr;
 	struct rd_dev_sg_table *table;
 	struct scatterlist *rd_sg;
 	struct sg_mapping_iter m;
-	u32 rd_offset = req->rd_offset;
+	u32 rd_offset;
+	u32 rd_size;
+	u32 rd_page;
 	u32 src_len;
+	u64 tmp;
 
-	table = rd_get_sg_table(dev, req->rd_page);
+	tmp = task->task_lba * se_dev->se_sub_dev->se_dev_attrib.block_size;
+	rd_offset = do_div(tmp, PAGE_SIZE);
+	rd_page = tmp;
+	rd_size = task->task_size;
+
+	table = rd_get_sg_table(dev, rd_page);
 	if (!table)
 		return -EINVAL;
 
-	rd_sg = &table->sg_table[req->rd_page - table->page_start_offset];
+	rd_sg = &table->sg_table[rd_page - table->page_start_offset];
 
 	pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n",
-			dev->rd_dev_id, read_rd ? "Read" : "Write",
-			task->task_lba, req->rd_size, req->rd_page,
-			rd_offset);
+			dev->rd_dev_id,
+			task->task_data_direction == DMA_FROM_DEVICE ?
+				"Read" : "Write",
+			task->task_lba, rd_size, rd_page, rd_offset);
 
 	src_len = PAGE_SIZE - rd_offset;
 	sg_miter_start(&m, task->task_sg, task->task_sg_nents,
-			read_rd ? SG_MITER_TO_SG : SG_MITER_FROM_SG);
-	while (req->rd_size) {
+			task->task_data_direction == DMA_FROM_DEVICE ?
+				SG_MITER_TO_SG : SG_MITER_FROM_SG);
+	while (rd_size) {
 		u32 len;
 		void *rd_addr;
 
@@ -375,13 +337,13 @@ static int rd_MEMCPY(struct rd_request *req, u32 read_rd)
 
 		rd_addr = sg_virt(rd_sg) + rd_offset;
 
-		if (read_rd)
+		if (task->task_data_direction == DMA_FROM_DEVICE)
 			memcpy(m.addr, rd_addr, len);
 		else
 			memcpy(rd_addr, m.addr, len);
 
-		req->rd_size -= len;
-		if (!req->rd_size)
+		rd_size -= len;
+		if (!rd_size)
 			continue;
 
 		src_len -= len;
@@ -391,15 +353,15 @@ static int rd_MEMCPY(struct rd_request *req, u32 read_rd)
 		}
 
 		/* rd page completed, next one please */
-		req->rd_page++;
+		rd_page++;
 		rd_offset = 0;
 		src_len = PAGE_SIZE;
-		if (req->rd_page <= table->page_end_offset) {
+		if (rd_page <= table->page_end_offset) {
 			rd_sg++;
 			continue;
 		}
 
-		table = rd_get_sg_table(dev, req->rd_page);
+		table = rd_get_sg_table(dev, rd_page);
 		if (!table) {
 			sg_miter_stop(&m);
 			return -EINVAL;
@@ -409,41 +371,15 @@ static int rd_MEMCPY(struct rd_request *req, u32 read_rd)
 		rd_sg = table->sg_table;
 	}
 	sg_miter_stop(&m);
-	return 0;
-}
-
-/*	rd_MEMCPY_do_task(): (Part of se_subsystem_api_t template)
- *
- *
- */
-static int rd_MEMCPY_do_task(struct se_task *task)
-{
-	struct se_device *dev = task->task_se_cmd->se_dev;
-	struct rd_request *req = RD_REQ(task);
-	u64 tmp;
-	int ret;
-
-	tmp = task->task_lba * dev->se_sub_dev->se_dev_attrib.block_size;
-	req->rd_offset = do_div(tmp, PAGE_SIZE);
-	req->rd_page = tmp;
-	req->rd_size = task->task_size;
-
-	ret = rd_MEMCPY(req, task->task_data_direction == DMA_FROM_DEVICE);
-	if (ret != 0)
-		return ret;
 
 	task->task_scsi_status = GOOD;
 	transport_complete_task(task, 1);
 	return 0;
 }
 
-/*	rd_free_task(): (Part of se_subsystem_api_t template)
- *
- *
- */
 static void rd_free_task(struct se_task *task)
 {
-	kfree(RD_REQ(task));
+	kfree(task);
 }
 
 enum {
@@ -512,9 +448,8 @@ static ssize_t rd_show_configfs_dev_params(
 	char *b)
 {
 	struct rd_dev *rd_dev = se_dev->se_dev_su_ptr;
-	ssize_t bl = sprintf(b, "TCM RamDisk ID: %u  RamDisk Makeup: %s\n",
-			rd_dev->rd_dev_id, (rd_dev->rd_direct) ?
-			"rd_direct" : "rd_mcp");
+	ssize_t bl = sprintf(b, "TCM RamDisk ID: %u  RamDisk Makeup: rd_mcp\n",
+			rd_dev->rd_dev_id);
 	bl += sprintf(b + bl, "        PAGES/PAGE_SIZE: %u*%lu"
 			"  SG_table_count: %u\n", rd_dev->rd_page_count,
 			PAGE_SIZE, rd_dev->sg_table_count);
@@ -545,11 +480,11 @@ static struct se_subsystem_api rd_mcp_template = {
 	.transport_type		= TRANSPORT_PLUGIN_VHBA_VDEV,
 	.attach_hba		= rd_attach_hba,
 	.detach_hba		= rd_detach_hba,
-	.allocate_virtdevice	= rd_MEMCPY_allocate_virtdevice,
-	.create_virtdevice	= rd_MEMCPY_create_virtdevice,
+	.allocate_virtdevice	= rd_allocate_virtdevice,
+	.create_virtdevice	= rd_create_virtdevice,
 	.free_device		= rd_free_device,
 	.alloc_task		= rd_alloc_task,
-	.do_task		= rd_MEMCPY_do_task,
+	.do_task		= rd_do_task,
 	.free_task		= rd_free_task,
 	.check_configfs_dev_params = rd_check_configfs_dev_params,
 	.set_configfs_dev_params = rd_set_configfs_dev_params,

drivers/target/target_core_rd.h

@@ -2,7 +2,6 @@
 #define TARGET_CORE_RD_H
 
 #define RD_HBA_VERSION		"v4.0"
-#define RD_DR_VERSION		"4.0"
 #define RD_MCP_VERSION		"4.0"
 
 /* Largest piece of memory kmalloc can allocate */
@@ -16,22 +15,6 @@
 int __init rd_module_init(void);
 void rd_module_exit(void);
 
-#define RRF_EMULATE_CDB		0x01
-#define RRF_GOT_LBA		0x02
-
-struct rd_request {
-	struct se_task	rd_task;
-
-	/* Offset from start of page */
-	u32		rd_offset;
-	/* Starting page in Ramdisk for request */
-	u32		rd_page;
-	/* Total number of pages needed for request */
-	u32		rd_page_count;
-	/* Scatterlist count */
-	u32		rd_size;
-} ____cacheline_aligned;
-
 struct rd_dev_sg_table {
 	u32		page_start_offset;
 	u32		page_end_offset;
@@ -42,7 +25,6 @@ struct rd_dev_sg_table {
 #define RDF_HAS_PAGE_COUNT	0x01
 
 struct rd_dev {
-	int		rd_direct;
 	u32		rd_flags;
 	/* Unique Ramdisk Device ID in Ramdisk HBA */
 	u32		rd_dev_id;
@@ -50,7 +32,6 @@ struct rd_dev {
 	u32		rd_page_count;
 	/* Number of SG tables in sg_table_array */
 	u32		sg_table_count;
-	u32		rd_queue_depth;
 	/* Array of rd_dev_sg_table_t containing scatterlists */
 	struct rd_dev_sg_table *sg_table_array;
 	/* Ramdisk HBA device is connected to */