Message-Id: <1284552402-30546-1-git-send-email-nab@linux-iscsi.org>
Date:	Wed, 15 Sep 2010 05:06:42 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Boaz Harrosh <bharrosh@...asas.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	Mike Christie <michaelc@...wisc.edu>,
	Hannes Reinecke <hare@...e.de>,
	James Bottomley <James.Bottomley@...e.de>,
	Konrad Rzeszutek Wilk <konrad@...nok.org>,
	Douglas Gilbert <dgilbert@...erlog.com>,
	Joe Eykholt <jeykholt@...co.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 1/2] tcm: Add support for BIDI operation and XDWRITE_READ_10 emulation

From: Nicholas Bellinger <nab@...ux-iscsi.org>

This patch series adds DMA_BIDIRECTIONAL support to TCM Core.  This
includes the following for struct se_cmd to handle BIDI READ payloads using a new
struct se_transport_task->t_mem_bidi_list and struct se_transport_task->t_tasks_se_bidi_num.
The model used to keep the WRITE payload at struct se_transport_task->t_mem_list,
and add a new READ payload memory list at struct se_transport_task->t_mem_bidi_list.

*) desciptor setup:

This patch adds support for XDWRITEREAD_10 within transport_generic_cmd_sequencer(),
and sets up the new struct se_cmd->transport_xor_callback() completion function
at transport_xor_callback().  It then updates transport_new_cmd_obj() to handle the
BIDI READ case.

It also adds support for DMA_BIDIRECTIONAL to transport_generic_map_mem_to_cmd()
to setup struct se_transport_task->t_mem_bidi_list for BIDI READ payloads

*) memory mapping:

This patch updates transport_generic_get_cdb_count() to accept a enum dma_data_direction
parameter to handle the BIDI and the existing WRITE/READ cases for SCF_SCSI_DATA_SG_IO_CDB.
This patch also updates transport_generic_map_mem_to_cmd() to accept a 'void *mem_bidi_in'
and 'u32 se_mem_bidi_num' from BIDI capable TCM fabric modules.

It then updates transport_generic_get_task() and struct se_cmd->transport_get_task()
to accept a enum dma_data_direction function parameter.

*) descriptor callback:

For the struct se_cmd callback, it updates transport_generic_complete_ok() to support
DMA_BIDIRECTIONAL and looks for the new struct se_cmd->transport_xor_callback() in
transport_generic_cmd_sequencer() to perform the post READ/WRITE XOR emulation.
This also includes the additon of transport_memcpy_se_mem_read_contig() used to copy the
WRITE scatterlists into a local contigious buffer for the XOR instructions within
transport_xor_callback();

*) descriptor release:

Update transport_free_pages() to walk the new T_TASK(cmd)->t_mem_bidi_list (when available)
and release struct se_mem and pages.

So far this has been tested with TCM_Loop using BSG w/ userspace code generating
BIDI XDWRITE_READ_10 CDBs.

Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
---
 drivers/target/target_core_transport.c |  282 ++++++++++++++++++++++++++++----
 include/target/target_core_base.h      |    9 +-
 include/target/target_core_transport.h |   10 +-
 3 files changed, 261 insertions(+), 40 deletions(-)

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 517a59c..37afc39 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2529,7 +2529,8 @@ static inline int transport_check_device_cdb_sector_count(
 static struct se_task *transport_generic_get_task(
 	struct se_transform_info *ti,
 	struct se_cmd *cmd,
-	void *se_obj_ptr)
+	void *se_obj_ptr,
+	enum dma_data_direction data_direction)
 {
 	struct se_task *task;
 	struct se_device *dev = SE_DEV(cmd);
@@ -2625,7 +2626,8 @@ static int transport_process_control_sg_transform(
 		return -1;
 	}
 
-	task = cmd->transport_get_task(ti, cmd, ti->se_obj_ptr);
+	task = cmd->transport_get_task(ti, cmd, ti->se_obj_ptr,
+				cmd->data_direction);
 	if (!(task))
 		return -1;
 
@@ -2665,7 +2667,8 @@ static int transport_process_control_nonsg_transform(
 	unsigned char *cdb;
 	struct se_task *task;
 
-	task = cmd->transport_get_task(ti, cmd, ti->se_obj_ptr);
+	task = cmd->transport_get_task(ti, cmd, ti->se_obj_ptr,
+				cmd->data_direction);
 	if (!(task))
 		return -1;
 
@@ -2699,7 +2702,8 @@ static int transport_process_non_data_transform(
 	unsigned char *cdb;
 	struct se_task *task;
 
-	task = cmd->transport_get_task(ti, cmd, ti->se_obj_ptr);
+	task = cmd->transport_get_task(ti, cmd, ti->se_obj_ptr,
+				cmd->data_direction);
 	if (!(task))
 		return -1;
 
@@ -5183,6 +5187,54 @@ int transport_generic_emulate_request_sense(
 }
 EXPORT_SYMBOL(transport_generic_emulate_request_sense);
 
+static void transport_xor_callback(struct se_cmd *cmd)
+{
+	unsigned char *buf, *addr;
+	struct se_mem *se_mem;
+	unsigned int offset;
+	int i;
+	/*
+	 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
+	 * 
+	 * 1) read the specified logical block(s);
+	 * 2) transfer logical blocks from the data-out buffer;
+	 * 3) XOR the logical blocks transferred from the data-out buffer with
+	 *    the logical blocks read, storing the resulting XOR data in a buffer;
+	 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
+	 *    blocks transferred from the data-out buffer; and
+	 * 5) transfer the resulting XOR data to the data-in buffer.
+	 */
+	buf = kmalloc(cmd->data_length, GFP_KERNEL);
+	if (!(buf)) {
+		printk(KERN_ERR "Unable to allocate xor_callback buf\n");
+		return;
+	}
+	/*
+	 * Copy the scatterlist WRITE buffer located at T_TASK(cmd)->t_mem_list
+	 * into the locally allocated *buf
+	 */
+	transport_memcpy_se_mem_read_contig(cmd, buf, T_TASK(cmd)->t_mem_list);
+	/*
+	 * Now perform the XOR against the BIDI read memory located at
+	 * T_TASK(cmd)->t_mem_bidi_list
+	 */
+
+	offset = 0;
+	list_for_each_entry(se_mem, T_TASK(cmd)->t_mem_bidi_list, se_list) {
+		addr = (unsigned char *)kmap_atomic(se_mem->se_page, KM_USER0);
+		if (!(addr))
+			goto out;
+
+		for (i = 0; i < se_mem->se_len; i++)
+			*(addr + se_mem->se_off + i) ^= *(buf + offset + i);
+
+		offset += se_mem->se_len;
+		kunmap_atomic(addr, KM_USER0);
+	}
+out:
+	kfree(buf);
+}
+
 /*
  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
  */
@@ -5472,6 +5524,25 @@ static int transport_generic_cmd_sequencer(
 		T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
 		ret = TGCS_DATA_SG_IO_CDB;
 		break;
+	case XDWRITEREAD_10:
+		SET_GENERIC_TRANSPORT_FUNCTIONS(cmd);
+		if (cmd->data_direction != DMA_BIDIRECTIONAL)
+			return TGCS_INVALID_CDB_FIELD;
+		sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
+		if (sector_ret)
+			return TGCS_UNSUPPORTED_CDB;
+		size = transport_get_size(sectors, cdb, cmd);
+		transport_dev_get_mem_SG(cmd->se_orig_obj_ptr, cmd);
+		transport_get_maps(cmd);
+		cmd->transport_split_cdb = &split_cdb_XX_10;
+		cmd->transport_get_lba = &transport_lba_32;
+		/*
+		 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
+		 */
+		cmd->transport_xor_callback = &transport_xor_callback;
+		T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
+		ret = TGCS_DATA_SG_IO_CDB;
+		break;
 	case 0xa3:
 		SET_GENERIC_TRANSPORT_FUNCTIONS(cmd);
 		if (TRANSPORT(dev)->get_device_type(dev) != TYPE_ROM) {
@@ -5842,9 +5913,10 @@ static int transport_generic_cmd_sequencer(
 
 		cmd->cmd_spdtl = size;
 
-		if (cmd->data_direction == DMA_TO_DEVICE) {
+		if ((cmd->data_direction == DMA_TO_DEVICE) ||
+		    (cmd->data_direction == DMA_BIDIRECTIONAL)) {
 			printk(KERN_ERR "Rejecting underflow/overflow"
-					" WRITE data\n");
+					" WRITE or BIDI data\n");
 			return TGCS_INVALID_CDB_FIELD;
 		}
 		/*
@@ -6096,6 +6168,33 @@ void transport_memcpy_read_contig(
 }
 EXPORT_SYMBOL(transport_memcpy_read_contig);
 
+void transport_memcpy_se_mem_read_contig(
+	struct se_cmd *cmd,
+	unsigned char *dst,
+	struct list_head *se_mem_list)
+{
+	struct se_mem *se_mem;
+	void *src;
+	u32 length = 0, total_length = cmd->data_length;
+
+	list_for_each_entry(se_mem, se_mem_list, se_list) {
+		length = se_mem->se_len;
+		
+		if (length > total_length)
+			length = total_length;
+
+		src = page_address(se_mem->se_page) + se_mem->se_off;
+		
+		memcpy(dst, src, length);
+
+		if (!(total_length -= length))
+			return;
+
+		dst += length;
+	}
+}
+
+
 /*     transport_generic_passthrough():
  *
  *
@@ -6252,6 +6351,18 @@ void transport_generic_complete_ok(struct se_cmd *cmd)
 
 	switch (cmd->data_direction) {
 	case DMA_FROM_DEVICE:
+	case DMA_BIDIRECTIONAL:
+		/*
+		 * Check for the XOR BIDI callback emulation for XD_WRITEREAD_*
+		 */
+		if (cmd->transport_xor_callback) {
+			/*
+			 * For fully emulated HBAs, this will translate to
+			 * transport_xor_callback()
+			 */
+			cmd->transport_xor_callback(cmd);
+		}
+
 		spin_lock(&cmd->se_lun->lun_sep_lock);
 		if (SE_LUN(cmd)->lun_sep) {
 			SE_LUN(cmd)->lun_sep->sep_stats.tx_data_octets +=
@@ -6347,6 +6458,23 @@ static inline void transport_free_pages(struct se_cmd *cmd)
 		kmem_cache_free(se_mem_cache, se_mem);
 	}
 
+	if (T_TASK(cmd)->t_mem_bidi_list && T_TASK(cmd)->t_tasks_se_bidi_num) {
+		list_for_each_entry_safe(se_mem, se_mem_tmp,
+				T_TASK(cmd)->t_mem_bidi_list, se_list) {
+			/*
+			 * We only release call __free_page(struct se_mem->se_page) when
+			 * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
+			 */
+			if (free_page)
+				__free_page(se_mem->se_page);
+
+			list_del(&se_mem->se_list);
+			kmem_cache_free(se_mem_cache, se_mem);
+		}
+	}
+
+	kfree(T_TASK(cmd)->t_mem_bidi_list);
+	T_TASK(cmd)->t_mem_bidi_list = NULL;
 	kfree(T_TASK(cmd)->t_mem_list);
 	T_TASK(cmd)->t_mem_list = NULL;
 	T_TASK(cmd)->t_tasks_se_num = 0;
@@ -6477,18 +6605,34 @@ release_cmd:
 int transport_generic_map_mem_to_cmd(
 	struct se_cmd *cmd,
 	void *mem,
-	u32 se_mem_num)
+	u32 se_mem_num,
+	void *mem_bidi_in,
+	u32 se_mem_bidi_num)
 {
 	u32 se_mem_cnt_out = 0;
 	int ret;
 
 	if (!(mem) || !(se_mem_num))
 		return 0;
+
+	if ((cmd->data_direction == DMA_BIDIRECTIONAL) &&
+	    (!(mem_bidi_in) || !(se_mem_bidi_num))) {
+		printk(KERN_ERR "Unable to process DMA_BIDIRECTIONAL with mem_bidi_in:"
+			" %p and se_mem_bidi_num: %u\n", mem_bidi_in, se_mem_bidi_num);
+		return -EINVAL;
+	}
+
 	/*
 	 * Passed *mem will contain a list_head containing preformatted
 	 * struct se_mem elements...
 	 */
 	if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM)) {
+		if (cmd->data_direction == DMA_BIDIRECTIONAL) {
+			printk(KERN_ERR "SCF_CMD_PASSTHROUGH_NOALLOC not supported"
+				" with DMA_BIDIRECTIONAL\n");
+			return -ENOSYS;
+		}
+
 		T_TASK(cmd)->t_mem_list = (struct list_head *)mem;
 		T_TASK(cmd)->t_tasks_se_num = se_mem_num;
 		cmd->se_cmd_flags |= SCF_CMD_PASSTHROUGH_NOALLOC;
@@ -6507,14 +6651,35 @@ int transport_generic_map_mem_to_cmd(
 		 */ 
 		T_TASK(cmd)->t_mem_list = transport_init_se_mem_list();
 		if (!(T_TASK(cmd)->t_mem_list))
-			return -1;
+			return -ENOMEM;
 
 		ret = transport_map_sg_to_mem(cmd,
 			T_TASK(cmd)->t_mem_list, mem, &se_mem_cnt_out);
 		if (ret < 0)
-			return -1;
+			return -ENOMEM;
 
 		T_TASK(cmd)->t_tasks_se_num = se_mem_cnt_out;
+		/*
+		 * Setup BIDI READ list of struct se_mem elements
+		 */
+		if (cmd->data_direction == DMA_BIDIRECTIONAL) {
+			T_TASK(cmd)->t_mem_bidi_list = transport_init_se_mem_list();
+			if (!(T_TASK(cmd)->t_mem_bidi_list)) {
+				kfree(T_TASK(cmd)->t_mem_list);
+				return -ENOMEM;
+			}
+			se_mem_cnt_out = 0;
+
+			ret = transport_map_sg_to_mem(cmd,
+				T_TASK(cmd)->t_mem_bidi_list, mem_bidi_in,
+				&se_mem_cnt_out);
+			if (ret < 0) {
+				kfree(T_TASK(cmd)->t_mem_list);
+				return -ENOMEM;
+			}
+
+			T_TASK(cmd)->t_tasks_se_bidi_num = se_mem_cnt_out;
+		}	
 		cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 
 	} else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) {
@@ -6610,6 +6775,11 @@ non_scsi_data:
  */
 int transport_generic_do_transform(struct se_cmd *cmd, struct se_transform_info *ti)
 {
+	if (!(cmd->transport_cdb_transform)) {
+		dump_stack();
+		return -1;
+	}
+	
 	if (cmd->transport_cdb_transform(cmd, ti) < 0)
 		return -1;
 
@@ -6656,9 +6826,9 @@ int transport_new_cmd_obj(
 	struct se_transform_info *ti,
 	int post_execute)
 {
-	u32 task_cdbs = 0;
-	struct se_mem *se_mem_out = NULL;
 	struct se_device *dev = SE_DEV(cmd);
+	enum dma_data_direction data_direction;
+	u32 task_cdbs = 0, rc;
 
 	if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
 		task_cdbs++;
@@ -6666,11 +6836,38 @@ int transport_new_cmd_obj(
 	} else {
 		ti->ti_set_counts = 1;
 		ti->ti_dev = dev;
-
+		/*
+		 * Setup any BIDI READ tasks and memory from
+		 * T_TASK(cmd)->t_mem_bidi_list so the READ struct se_tasks
+		 * are queued first..
+		 */
+		if (cmd->data_direction == DMA_BIDIRECTIONAL) {
+			rc = transport_generic_get_cdb_count(cmd, ti,
+				T_TASK(cmd)->t_task_lba,
+				T_TASK(cmd)->t_tasks_sectors,
+				DMA_FROM_DEVICE, T_TASK(cmd)->t_mem_bidi_list);
+			if (!(rc)) {
+				cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+				cmd->scsi_sense_reason =
+					TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+				return PYX_TRANSPORT_LU_COMM_FAILURE;
+			}
+			ti->ti_set_counts = 0;
+			/*
+			 * Setup the DMA_TO_DEVICE direction for the next
+			 * call to transport_generic_get_cdb_count()
+			 */
+			data_direction = DMA_TO_DEVICE;
+		} else
+			data_direction = cmd->data_direction;
+		/*
+		 * Setup the tasks and memory from T_TASK(cmd)->t_mem_list
+		 * Note for BIDI transfers this will contain the WRITE payload
+		 */
 		task_cdbs = transport_generic_get_cdb_count(cmd, ti,
 				T_TASK(cmd)->t_task_lba,
 				T_TASK(cmd)->t_tasks_sectors,
-				NULL, &se_mem_out);
+				data_direction,	T_TASK(cmd)->t_mem_list);
 		if (!(task_cdbs)) {
 			cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 			cmd->scsi_sense_reason =
@@ -6743,7 +6940,17 @@ int transport_generic_get_mem(struct se_cmd *cmd, u32 length, u32 dma_size)
 
 	T_TASK(cmd)->t_mem_list = transport_init_se_mem_list();
 	if (!(T_TASK(cmd)->t_mem_list))
-		return -1;
+		return -ENOMEM;
+	/*
+	 * Setup BIDI READ list of struct se_mem elements
+	 */
+	if (cmd->data_direction == DMA_BIDIRECTIONAL) {
+		T_TASK(cmd)->t_mem_bidi_list = transport_init_se_mem_list();
+		if (!(T_TASK(cmd)->t_mem_bidi_list)) {
+			kfree(T_TASK(cmd)->t_mem_list);
+			return -ENOMEM;
+		}
+	}
 
 	while (length) {
 		se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
@@ -7240,28 +7447,28 @@ u32 transport_generic_get_cdb_count(
 	struct se_transform_info *ti,
 	unsigned long long starting_lba,
 	u32 sectors,
-	struct se_mem *se_mem_in,
-	struct se_mem **se_mem_out)
+	enum dma_data_direction data_direction,
+	struct list_head *mem_list)
 {
 	unsigned char *cdb = NULL;
 	struct se_task *task;
-	struct se_mem *se_mem, *se_mem_lout = NULL;
+	struct se_mem *se_mem = NULL, *se_mem_lout = NULL;
 	struct se_device *dev = SE_DEV(cmd);
 	int max_sectors_set = 0, ret;
 	u32 task_offset_in = 0, se_mem_cnt = 0, task_cdbs = 0;
 	unsigned long long lba;
 
-	if (!se_mem_in) {
-		list_for_each_entry(se_mem_in, T_TASK(cmd)->t_mem_list, se_list)
-			break;
-
-		if (!se_mem_in) {
-			printk(KERN_ERR "se_mem_in is NULL\n");
-			return 0;
-		}
+	if (!mem_list) {
+		printk(KERN_ERR "mem_list is NULL in transport_generic_get"
+				"_cdb_count()\n");
+		return 0;
 	}
-	se_mem = se_mem_in;
-
+	/*
+	 * While using RAMDISK_DR backstores is the only case where
+	 * mem_list will ever be empty at this point.
+	 */
+	if (!(list_empty(mem_list)))
+		se_mem = list_entry(mem_list->next, struct se_mem, se_list);
 	/*
 	 * Locate the start volume segment in which the received LBA will be
 	 * executed upon.
@@ -7280,7 +7487,12 @@ u32 transport_generic_get_cdb_count(
 			CMD_TFO(cmd)->get_task_tag(cmd), lba, sectors,
 			transport_dev_end_lba(dev));
 
-		task = cmd->transport_get_task(ti, cmd, dev);
+		if (!(cmd->transport_get_task)) {
+			dump_stack();
+			goto out;
+		}
+
+		task = cmd->transport_get_task(ti, cmd, dev, data_direction);
 		if (!(task))
 			goto out;
 
@@ -7293,7 +7505,7 @@ u32 transport_generic_get_cdb_count(
 		task->task_size = (task->task_sectors *
 				   DEV_ATTRIB(dev)->block_size);
 		task->transport_map_task = transport_dev_get_map_SG(dev,
-					cmd->data_direction);
+					data_direction);
 
 		cdb = TRANSPORT(dev)->get_cdb(task);
 		if ((cdb)) {
@@ -7306,14 +7518,13 @@ u32 transport_generic_get_cdb_count(
 		 * Perform the SE OBJ plugin and/or Transport plugin specific
 		 * mapping for T_TASK(cmd)->t_mem_list.
 		 */
-		ret = transport_do_se_mem_map(dev, task,
-				T_TASK(cmd)->t_mem_list, NULL, se_mem,
-				&se_mem_lout, &se_mem_cnt, &task_offset_in);
+		ret = transport_do_se_mem_map(dev, task, mem_list,
+				NULL, se_mem, &se_mem_lout, &se_mem_cnt,
+				&task_offset_in);
 		if (ret < 0)
 			goto out;
 
 		se_mem = se_mem_lout;
-		*se_mem_out = se_mem_lout;
 		task_cdbs++;
 
 		DEBUG_VOL("Incremented task_cdbs(%u) task->task_sg_num(%u)\n",
@@ -7333,8 +7544,9 @@ u32 transport_generic_get_cdb_count(
 		atomic_inc(&T_TASK(cmd)->t_se_count);
 	}
 
-	DEBUG_VOL("ITT[0x%08x] total cdbs(%u)\n",
-		CMD_TFO(cmd)->get_task_tag(cmd), task_cdbs);
+	DEBUG_VOL("ITT[0x%08x] total %s cdbs(%u)\n",
+		CMD_TFO(cmd)->get_task_tag(cmd), (data_direction == DMA_TO_DEVICE)
+		? "DMA_TO_DEVICE" : "DMA_FROM_DEVICE", task_cdbs);
 
 	return task_cdbs;
 out:
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index e9b98e9..f1b9364 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -419,6 +419,7 @@ struct se_transport_task {
 	u32			t_tasks_no;
 	u32			t_tasks_sectors;
 	u32			t_tasks_se_num;
+	u32			t_tasks_se_bidi_num;
 	u32			t_tasks_sg_chained_no;
 	atomic_t		t_fe_count;
 	atomic_t		t_se_count;
@@ -447,8 +448,10 @@ struct se_transport_task {
 	struct scatterlist	t_tasks_sg_bounce;
 	void			*t_task_buf;
 	void			*t_task_pt_buf;
-	struct list_head	t_task_list;
 	struct list_head	*t_mem_list;
+	/* Used for BIDI READ */
+	struct list_head	*t_mem_bidi_list;
+	struct list_head	t_task_list;
 } ____cacheline_aligned;
 
 struct se_task {
@@ -598,7 +601,8 @@ struct se_cmd {
 	u32 (*transport_get_lba)(unsigned char *);
 	unsigned long long (*transport_get_long_lba)(unsigned char *);
 	struct se_task *(*transport_get_task)(struct se_transform_info *,
-					struct se_cmd *, void *);
+					struct se_cmd *, void *,
+					enum dma_data_direction);
 	int (*transport_map_buffers_to_tasks)(struct se_cmd *);
 	void (*transport_map_SG_segments)(struct se_unmap_sg *);
 	void (*transport_passthrough_done)(struct se_cmd *);
@@ -607,6 +611,7 @@ struct se_cmd {
 					struct se_unmap_sg *);
 	void (*transport_split_cdb)(unsigned long long, u32 *, unsigned char *);
 	void (*transport_wait_for_tasks)(struct se_cmd *, int, int);
+	void (*transport_xor_callback)(struct se_cmd *);
 	void (*callback)(struct se_cmd *cmd, void *callback_arg,
 			int complete_status);
 	void *callback_arg;
diff --git a/include/target/target_core_transport.h b/include/target/target_core_transport.h
index ef4c084..20702d7 100644
--- a/include/target/target_core_transport.h
+++ b/include/target/target_core_transport.h
@@ -232,6 +232,8 @@ extern void transport_memcpy_write_contig(struct se_cmd *, struct scatterlist *,
 				unsigned char *);
 extern void transport_memcpy_read_contig(struct se_cmd *, unsigned char *,
 				struct scatterlist *);
+extern void transport_memcpy_se_mem_read_contig(struct se_cmd *,
+				unsigned char *, struct list_head *);
 extern int transport_generic_passthrough_async(struct se_cmd *cmd,
 				void(*callback)(struct se_cmd *cmd,
 				void *callback_arg, int complete_status),
@@ -242,7 +244,8 @@ extern void transport_generic_complete_ok(struct se_cmd *);
 extern void transport_free_dev_tasks(struct se_cmd *);
 extern void transport_release_fe_cmd(struct se_cmd *);
 extern int transport_generic_remove(struct se_cmd *, int, int);
-extern int transport_generic_map_mem_to_cmd(struct se_cmd *cmd, void *, u32);
+extern int transport_generic_map_mem_to_cmd(struct se_cmd *cmd, void *, u32,
+				void *, u32);
 extern int transport_lun_wait_for_tasks(struct se_cmd *, struct se_lun *);
 extern int transport_clear_lun_from_sessions(struct se_lun *);
 extern int transport_check_aborted_status(struct se_cmd *, int);
@@ -271,8 +274,9 @@ extern int transport_map_mem_to_sg(struct se_task *, struct list_head *,
 extern void transport_do_task_sg_chain(struct se_cmd *);
 extern u32 transport_generic_get_cdb_count(struct se_cmd *,
 					struct se_transform_info *,
-					unsigned long long, u32, struct se_mem *,
-					struct se_mem **);
+					unsigned long long, u32,
+					enum dma_data_direction,
+					struct list_head *);
 extern int transport_generic_new_cmd(struct se_cmd *);
 extern void transport_generic_process_write(struct se_cmd *);
 extern int transport_generic_do_tmr(struct se_cmd *);
-- 
1.5.6.5

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