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, 0 insertions, 1206 deletions

diff --git a/ANDROID_3.4.5/drivers/scsi/libiscsi_tcp.c b/ANDROID_3.4.5/drivers/scsi/libiscsi_tcp.c
deleted file mode 100644
index 552e8a2b..00000000
--- a/ANDROID_3.4.5/drivers/scsi/libiscsi_tcp.c
+++ /dev/null
@@ -1,1206 +0,0 @@
-/*
- * iSCSI over TCP/IP Data-Path lib
- *
- * Copyright (C) 2004 Dmitry Yusupov
- * Copyright (C) 2004 Alex Aizman
- * Copyright (C) 2005 - 2006 Mike Christie
- * Copyright (C) 2006 Red Hat, Inc.  All rights reserved.
- * maintained by open-iscsi@googlegroups.com
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * See the file COPYING included with this distribution for more details.
- *
- * Credits:
- *	Christoph Hellwig
- *	FUJITA Tomonori
- *	Arne Redlich
- *	Zhenyu Wang
- */
-
-#include <linux/types.h>
-#include <linux/list.h>
-#include <linux/inet.h>
-#include <linux/slab.h>
-#include <linux/file.h>
-#include <linux/blkdev.h>
-#include <linux/crypto.h>
-#include <linux/delay.h>
-#include <linux/kfifo.h>
-#include <linux/scatterlist.h>
-#include <linux/module.h>
-#include <net/tcp.h>
-#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_device.h>
-#include <scsi/scsi_host.h>
-#include <scsi/scsi.h>
-#include <scsi/scsi_transport_iscsi.h>
-
-#include "iscsi_tcp.h"
-
-MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
-	      "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
-	      "Alex Aizman <itn780@yahoo.com>");
-MODULE_DESCRIPTION("iSCSI/TCP data-path");
-MODULE_LICENSE("GPL");
-
-static int iscsi_dbg_libtcp;
-module_param_named(debug_libiscsi_tcp, iscsi_dbg_libtcp, int,
-		   S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(debug_libiscsi_tcp, "Turn on debugging for libiscsi_tcp "
-		 "module. Set to 1 to turn on, and zero to turn off. Default "
-		 "is off.");
-
-#define ISCSI_DBG_TCP(_conn, dbg_fmt, arg...)			\
-	do {							\
-		if (iscsi_dbg_libtcp)				\
-			iscsi_conn_printk(KERN_INFO, _conn,	\
-					     "%s " dbg_fmt,	\
-					     __func__, ##arg);	\
-	} while (0);
-
-static int iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn,
-				   struct iscsi_segment *segment);
-
-/*
- * Scatterlist handling: inside the iscsi_segment, we
- * remember an index into the scatterlist, and set data/size
- * to the current scatterlist entry. For highmem pages, we
- * kmap as needed.
- *
- * Note that the page is unmapped when we return from
- * TCP's data_ready handler, so we may end up mapping and
- * unmapping the same page repeatedly. The whole reason
- * for this is that we shouldn't keep the page mapped
- * outside the softirq.
- */
-
-/**
- * iscsi_tcp_segment_init_sg - init indicated scatterlist entry
- * @segment: the buffer object
- * @sg: scatterlist
- * @offset: byte offset into that sg entry
- *
- * This function sets up the segment so that subsequent
- * data is copied to the indicated sg entry, at the given
- * offset.
- */
-static inline void
-iscsi_tcp_segment_init_sg(struct iscsi_segment *segment,
-			  struct scatterlist *sg, unsigned int offset)
-{
-	segment->sg = sg;
-	segment->sg_offset = offset;
-	segment->size = min(sg->length - offset,
-			    segment->total_size - segment->total_copied);
-	segment->data = NULL;
-}
-
-/**
- * iscsi_tcp_segment_map - map the current S/G page
- * @segment: iscsi_segment
- * @recv: 1 if called from recv path
- *
- * We only need to possibly kmap data if scatter lists are being used,
- * because the iscsi passthrough and internal IO paths will never use high
- * mem pages.
- */
-static void iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv)
-{
-	struct scatterlist *sg;
-
-	if (segment->data != NULL || !segment->sg)
-		return;
-
-	sg = segment->sg;
-	BUG_ON(segment->sg_mapped);
-	BUG_ON(sg->length == 0);
-
-	/*
-	 * If the page count is greater than one it is ok to send
-	 * to the network layer's zero copy send path. If not we
-	 * have to go the slow sendmsg path. We always map for the
-	 * recv path.
-	 */
-	if (page_count(sg_page(sg)) >= 1 && !recv)
-		return;
-
-	if (recv) {
-		segment->atomic_mapped = true;
-		segment->sg_mapped = kmap_atomic(sg_page(sg));
-	} else {
-		segment->atomic_mapped = false;
-		/* the xmit path can sleep with the page mapped so use kmap */
-		segment->sg_mapped = kmap(sg_page(sg));
-	}
-
-	segment->data = segment->sg_mapped + sg->offset + segment->sg_offset;
-}
-
-void iscsi_tcp_segment_unmap(struct iscsi_segment *segment)
-{
-	if (segment->sg_mapped) {
-		if (segment->atomic_mapped)
-			kunmap_atomic(segment->sg_mapped);
-		else
-			kunmap(sg_page(segment->sg));
-		segment->sg_mapped = NULL;
-		segment->data = NULL;
-	}
-}
-EXPORT_SYMBOL_GPL(iscsi_tcp_segment_unmap);
-
-/*
- * Splice the digest buffer into the buffer
- */
-static inline void
-iscsi_tcp_segment_splice_digest(struct iscsi_segment *segment, void *digest)
-{
-	segment->data = digest;
-	segment->digest_len = ISCSI_DIGEST_SIZE;
-	segment->total_size += ISCSI_DIGEST_SIZE;
-	segment->size = ISCSI_DIGEST_SIZE;
-	segment->copied = 0;
-	segment->sg = NULL;
-	segment->hash = NULL;
-}
-
-/**
- * iscsi_tcp_segment_done - check whether the segment is complete
- * @tcp_conn: iscsi tcp connection
- * @segment: iscsi segment to check
- * @recv: set to one of this is called from the recv path
- * @copied: number of bytes copied
- *
- * Check if we're done receiving this segment. If the receive
- * buffer is full but we expect more data, move on to the
- * next entry in the scatterlist.
- *
- * If the amount of data we received isn't a multiple of 4,
- * we will transparently receive the pad bytes, too.
- *
- * This function must be re-entrant.
- */
-int iscsi_tcp_segment_done(struct iscsi_tcp_conn *tcp_conn,
-			   struct iscsi_segment *segment, int recv,
-			   unsigned copied)
-{
-	struct scatterlist sg;
-	unsigned int pad;
-
-	ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "copied %u %u size %u %s\n",
-		      segment->copied, copied, segment->size,
-		      recv ? "recv" : "xmit");
-	if (segment->hash && copied) {
-		/*
-		 * If a segment is kmapd we must unmap it before sending
-		 * to the crypto layer since that will try to kmap it again.
-		 */
-		iscsi_tcp_segment_unmap(segment);
-
-		if (!segment->data) {
-			sg_init_table(&sg, 1);
-			sg_set_page(&sg, sg_page(segment->sg), copied,
-				    segment->copied + segment->sg_offset +
-							segment->sg->offset);
-		} else
-			sg_init_one(&sg, segment->data + segment->copied,
-				    copied);
-		crypto_hash_update(segment->hash, &sg, copied);
-	}
-
-	segment->copied += copied;
-	if (segment->copied < segment->size) {
-		iscsi_tcp_segment_map(segment, recv);
-		return 0;
-	}
-
-	segment->total_copied += segment->copied;
-	segment->copied = 0;
-	segment->size = 0;
-
-	/* Unmap the current scatterlist page, if there is one. */
-	iscsi_tcp_segment_unmap(segment);
-
-	/* Do we have more scatterlist entries? */
-	ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "total copied %u total size %u\n",
-		      segment->total_copied, segment->total_size);
-	if (segment->total_copied < segment->total_size) {
-		/* Proceed to the next entry in the scatterlist. */
-		iscsi_tcp_segment_init_sg(segment, sg_next(segment->sg),
-					  0);
-		iscsi_tcp_segment_map(segment, recv);
-		BUG_ON(segment->size == 0);
-		return 0;
-	}
-
-	/* Do we need to handle padding? */
-	if (!(tcp_conn->iscsi_conn->session->tt->caps & CAP_PADDING_OFFLOAD)) {
-		pad = iscsi_padding(segment->total_copied);
-		if (pad != 0) {
-			ISCSI_DBG_TCP(tcp_conn->iscsi_conn,
-				      "consume %d pad bytes\n", pad);
-			segment->total_size += pad;
-			segment->size = pad;
-			segment->data = segment->padbuf;
-			return 0;
-		}
-	}
-
-	/*
-	 * Set us up for transferring the data digest. hdr digest
-	 * is completely handled in hdr done function.
-	 */
-	if (segment->hash) {
-		crypto_hash_final(segment->hash, segment->digest);
-		iscsi_tcp_segment_splice_digest(segment,
-				 recv ? segment->recv_digest : segment->digest);
-		return 0;
-	}
-
-	return 1;
-}
-EXPORT_SYMBOL_GPL(iscsi_tcp_segment_done);
-
-/**
- * iscsi_tcp_segment_recv - copy data to segment
- * @tcp_conn: the iSCSI TCP connection
- * @segment: the buffer to copy to
- * @ptr: data pointer
- * @len: amount of data available
- *
- * This function copies up to @len bytes to the
- * given buffer, and returns the number of bytes
- * consumed, which can actually be less than @len.
- *
- * If hash digest is enabled, the function will update the
- * hash while copying.
- * Combining these two operations doesn't buy us a lot (yet),
- * but in the future we could implement combined copy+crc,
- * just way we do for network layer checksums.
- */
-static int
-iscsi_tcp_segment_recv(struct iscsi_tcp_conn *tcp_conn,
-		       struct iscsi_segment *segment, const void *ptr,
-		       unsigned int len)
-{
-	unsigned int copy = 0, copied = 0;
-
-	while (!iscsi_tcp_segment_done(tcp_conn, segment, 1, copy)) {
-		if (copied == len) {
-			ISCSI_DBG_TCP(tcp_conn->iscsi_conn,
-				      "copied %d bytes\n", len);
-			break;
-		}
-
-		copy = min(len - copied, segment->size - segment->copied);
-		ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "copying %d\n", copy);
-		memcpy(segment->data + segment->copied, ptr + copied, copy);
-		copied += copy;
-	}
-	return copied;
-}
-
-inline void
-iscsi_tcp_dgst_header(struct hash_desc *hash, const void *hdr, size_t hdrlen,
-		      unsigned char digest[ISCSI_DIGEST_SIZE])
-{
-	struct scatterlist sg;
-
-	sg_init_one(&sg, hdr, hdrlen);
-	crypto_hash_digest(hash, &sg, hdrlen, digest);
-}
-EXPORT_SYMBOL_GPL(iscsi_tcp_dgst_header);
-
-static inline int
-iscsi_tcp_dgst_verify(struct iscsi_tcp_conn *tcp_conn,
-		      struct iscsi_segment *segment)
-{
-	if (!segment->digest_len)
-		return 1;
-
-	if (memcmp(segment->recv_digest, segment->digest,
-		   segment->digest_len)) {
-		ISCSI_DBG_TCP(tcp_conn->iscsi_conn, "digest mismatch\n");
-		return 0;
-	}
-
-	return 1;
-}
-
-/*
- * Helper function to set up segment buffer
- */
-static inline void
-__iscsi_segment_init(struct iscsi_segment *segment, size_t size,
-		     iscsi_segment_done_fn_t *done, struct hash_desc *hash)
-{
-	memset(segment, 0, sizeof(*segment));
-	segment->total_size = size;
-	segment->done = done;
-
-	if (hash) {
-		segment->hash = hash;
-		crypto_hash_init(hash);
-	}
-}
-
-inline void
-iscsi_segment_init_linear(struct iscsi_segment *segment, void *data,
-			  size_t size, iscsi_segment_done_fn_t *done,
-			  struct hash_desc *hash)
-{
-	__iscsi_segment_init(segment, size, done, hash);
-	segment->data = data;
-	segment->size = size;
-}
-EXPORT_SYMBOL_GPL(iscsi_segment_init_linear);
-
-inline int
-iscsi_segment_seek_sg(struct iscsi_segment *segment,
-		      struct scatterlist *sg_list, unsigned int sg_count,
-		      unsigned int offset, size_t size,
-		      iscsi_segment_done_fn_t *done, struct hash_desc *hash)
-{
-	struct scatterlist *sg;
-	unsigned int i;
-
-	__iscsi_segment_init(segment, size, done, hash);
-	for_each_sg(sg_list, sg, sg_count, i) {
-		if (offset < sg->length) {
-			iscsi_tcp_segment_init_sg(segment, sg, offset);
-			return 0;
-		}
-		offset -= sg->length;
-	}
-
-	return ISCSI_ERR_DATA_OFFSET;
-}
-EXPORT_SYMBOL_GPL(iscsi_segment_seek_sg);
-
-/**
- * iscsi_tcp_hdr_recv_prep - prep segment for hdr reception
- * @tcp_conn: iscsi connection to prep for
- *
- * This function always passes NULL for the hash argument, because when this
- * function is called we do not yet know the final size of the header and want
- * to delay the digest processing until we know that.
- */
-void iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn)
-{
-	ISCSI_DBG_TCP(tcp_conn->iscsi_conn,
-		      "(%s)\n", tcp_conn->iscsi_conn->hdrdgst_en ?
-		      "digest enabled" : "digest disabled");
-	iscsi_segment_init_linear(&tcp_conn->in.segment,
-				tcp_conn->in.hdr_buf, sizeof(struct iscsi_hdr),
-				iscsi_tcp_hdr_recv_done, NULL);
-}
-EXPORT_SYMBOL_GPL(iscsi_tcp_hdr_recv_prep);
-
-/*
- * Handle incoming reply to any other type of command
- */
-static int
-iscsi_tcp_data_recv_done(struct iscsi_tcp_conn *tcp_conn,
-			 struct iscsi_segment *segment)
-{
-	struct iscsi_conn *conn = tcp_conn->iscsi_conn;
-	int rc = 0;
-
-	if (!iscsi_tcp_dgst_verify(tcp_conn, segment))
-		return ISCSI_ERR_DATA_DGST;
-
-	rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr,
-			conn->data, tcp_conn->in.datalen);
-	if (rc)
-		return rc;
-
-	iscsi_tcp_hdr_recv_prep(tcp_conn);
-	return 0;
-}
-
-static void
-iscsi_tcp_data_recv_prep(struct iscsi_tcp_conn *tcp_conn)
-{
-	struct iscsi_conn *conn = tcp_conn->iscsi_conn;
-	struct hash_desc *rx_hash = NULL;
-
-	if (conn->datadgst_en &&
-	    !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD))
-		rx_hash = tcp_conn->rx_hash;
-
-	iscsi_segment_init_linear(&tcp_conn->in.segment,
-				conn->data, tcp_conn->in.datalen,
-				iscsi_tcp_data_recv_done, rx_hash);
-}
-
-/**
- * iscsi_tcp_cleanup_task - free tcp_task resources
- * @task: iscsi task
- *
- * must be called with session lock
- */
-void iscsi_tcp_cleanup_task(struct iscsi_task *task)
-{
-	struct iscsi_tcp_task *tcp_task = task->dd_data;
-	struct iscsi_r2t_info *r2t;
-
-	/* nothing to do for mgmt */
-	if (!task->sc)
-		return;
-
-	/* flush task's r2t queues */
-	while (kfifo_out(&tcp_task->r2tqueue, (void*)&r2t, sizeof(void*))) {
-		kfifo_in(&tcp_task->r2tpool.queue, (void*)&r2t,
-			    sizeof(void*));
-		ISCSI_DBG_TCP(task->conn, "pending r2t dropped\n");
-	}
-
-	r2t = tcp_task->r2t;
-	if (r2t != NULL) {
-		kfifo_in(&tcp_task->r2tpool.queue, (void*)&r2t,
-			    sizeof(void*));
-		tcp_task->r2t = NULL;
-	}
-}
-EXPORT_SYMBOL_GPL(iscsi_tcp_cleanup_task);
-
-/**
- * iscsi_tcp_data_in - SCSI Data-In Response processing
- * @conn: iscsi connection
- * @task: scsi command task
- */
-static int iscsi_tcp_data_in(struct iscsi_conn *conn, struct iscsi_task *task)
-{
-	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
-	struct iscsi_tcp_task *tcp_task = task->dd_data;
-	struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr;
-	int datasn = be32_to_cpu(rhdr->datasn);
-	unsigned total_in_length = scsi_in(task->sc)->length;
-
-	/*
-	 * lib iscsi will update this in the completion handling if there
-	 * is status.
-	 */
-	if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
-		iscsi_update_cmdsn(conn->session, (struct iscsi_nopin*)rhdr);
-
-	if (tcp_conn->in.datalen == 0)
-		return 0;
-
-	if (tcp_task->exp_datasn != datasn) {
-		ISCSI_DBG_TCP(conn, "task->exp_datasn(%d) != rhdr->datasn(%d)"
-			      "\n", tcp_task->exp_datasn, datasn);
-		return ISCSI_ERR_DATASN;
-	}
-
-	tcp_task->exp_datasn++;
-
-	tcp_task->data_offset = be32_to_cpu(rhdr->offset);
-	if (tcp_task->data_offset + tcp_conn->in.datalen > total_in_length) {
-		ISCSI_DBG_TCP(conn, "data_offset(%d) + data_len(%d) > "
-			      "total_length_in(%d)\n", tcp_task->data_offset,
-			      tcp_conn->in.datalen, total_in_length);
-		return ISCSI_ERR_DATA_OFFSET;
-	}
-
-	conn->datain_pdus_cnt++;
-	return 0;
-}
-
-/**
- * iscsi_tcp_r2t_rsp - iSCSI R2T Response processing
- * @conn: iscsi connection
- * @task: scsi command task
- */
-static int iscsi_tcp_r2t_rsp(struct iscsi_conn *conn, struct iscsi_task *task)
-{
-	struct iscsi_session *session = conn->session;
-	struct iscsi_tcp_task *tcp_task = task->dd_data;
-	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
-	struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr;
-	struct iscsi_r2t_info *r2t;
-	int r2tsn = be32_to_cpu(rhdr->r2tsn);
-	int rc;
-
-	if (tcp_conn->in.datalen) {
-		iscsi_conn_printk(KERN_ERR, conn,
-				  "invalid R2t with datalen %d\n",
-				  tcp_conn->in.datalen);
-		return ISCSI_ERR_DATALEN;
-	}
-
-	if (tcp_task->exp_datasn != r2tsn){
-		ISCSI_DBG_TCP(conn, "task->exp_datasn(%d) != rhdr->r2tsn(%d)\n",
-			      tcp_task->exp_datasn, r2tsn);
-		return ISCSI_ERR_R2TSN;
-	}
-
-	/* fill-in new R2T associated with the task */
-	iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
-
-	if (!task->sc || session->state != ISCSI_STATE_LOGGED_IN) {
-		iscsi_conn_printk(KERN_INFO, conn,
-				  "dropping R2T itt %d in recovery.\n",
-				  task->itt);
-		return 0;
-	}
-
-	rc = kfifo_out(&tcp_task->r2tpool.queue, (void*)&r2t, sizeof(void*));
-	if (!rc) {
-		iscsi_conn_printk(KERN_ERR, conn, "Could not allocate R2T. "
-				  "Target has sent more R2Ts than it "
-				  "negotiated for or driver has has leaked.\n");
-		return ISCSI_ERR_PROTO;
-	}
-
-	r2t->exp_statsn = rhdr->statsn;
-	r2t->data_length = be32_to_cpu(rhdr->data_length);
-	if (r2t->data_length == 0) {
-		iscsi_conn_printk(KERN_ERR, conn,
-				  "invalid R2T with zero data len\n");
-		kfifo_in(&tcp_task->r2tpool.queue, (void*)&r2t,
-			    sizeof(void*));
-		return ISCSI_ERR_DATALEN;
-	}
-
-	if (r2t->data_length > session->max_burst)
-		ISCSI_DBG_TCP(conn, "invalid R2T with data len %u and max "
-			      "burst %u. Attempting to execute request.\n",
-			      r2t->data_length, session->max_burst);
-
-	r2t->data_offset = be32_to_cpu(rhdr->data_offset);
-	if (r2t->data_offset + r2t->data_length > scsi_out(task->sc)->length) {
-		iscsi_conn_printk(KERN_ERR, conn,
-				  "invalid R2T with data len %u at offset %u "
-				  "and total length %d\n", r2t->data_length,
-				  r2t->data_offset, scsi_out(task->sc)->length);
-		kfifo_in(&tcp_task->r2tpool.queue, (void*)&r2t,
-			    sizeof(void*));
-		return ISCSI_ERR_DATALEN;
-	}
-
-	r2t->ttt = rhdr->ttt; /* no flip */
-	r2t->datasn = 0;
-	r2t->sent = 0;
-
-	tcp_task->exp_datasn = r2tsn + 1;
-	kfifo_in(&tcp_task->r2tqueue, (void*)&r2t, sizeof(void*));
-	conn->r2t_pdus_cnt++;
-
-	iscsi_requeue_task(task);
-	return 0;
-}
-
-/*
- * Handle incoming reply to DataIn command
- */
-static int
-iscsi_tcp_process_data_in(struct iscsi_tcp_conn *tcp_conn,
-			  struct iscsi_segment *segment)
-{
-	struct iscsi_conn *conn = tcp_conn->iscsi_conn;
-	struct iscsi_hdr *hdr = tcp_conn->in.hdr;
-	int rc;
-
-	if (!iscsi_tcp_dgst_verify(tcp_conn, segment))
-		return ISCSI_ERR_DATA_DGST;
-
-	/* check for non-exceptional status */
-	if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
-		rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0);
-		if (rc)
-			return rc;
-	}
-
-	iscsi_tcp_hdr_recv_prep(tcp_conn);
-	return 0;
-}
-
-/**
- * iscsi_tcp_hdr_dissect - process PDU header
- * @conn: iSCSI connection
- * @hdr: PDU header
- *
- * This function analyzes the header of the PDU received,
- * and performs several sanity checks. If the PDU is accompanied
- * by data, the receive buffer is set up to copy the incoming data
- * to the correct location.
- */
-static int
-iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
-{
-	int rc = 0, opcode, ahslen;
-	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
-	struct iscsi_task *task;
-
-	/* verify PDU length */
-	tcp_conn->in.datalen = ntoh24(hdr->dlength);
-	if (tcp_conn->in.datalen > conn->max_recv_dlength) {
-		iscsi_conn_printk(KERN_ERR, conn,
-				  "iscsi_tcp: datalen %d > %d\n",
-				  tcp_conn->in.datalen, conn->max_recv_dlength);
-		return ISCSI_ERR_DATALEN;
-	}
-
-	/* Additional header segments. So far, we don't
-	 * process additional headers.
-	 */
-	ahslen = hdr->hlength << 2;
-
-	opcode = hdr->opcode & ISCSI_OPCODE_MASK;
-	/* verify itt (itt encoding: age+cid+itt) */
-	rc = iscsi_verify_itt(conn, hdr->itt);
-	if (rc)
-		return rc;
-
-	ISCSI_DBG_TCP(conn, "opcode 0x%x ahslen %d datalen %d\n",
-		      opcode, ahslen, tcp_conn->in.datalen);
-
-	switch(opcode) {
-	case ISCSI_OP_SCSI_DATA_IN:
-		spin_lock(&conn->session->lock);
-		task = iscsi_itt_to_ctask(conn, hdr->itt);
-		if (!task)
-			rc = ISCSI_ERR_BAD_ITT;
-		else
-			rc = iscsi_tcp_data_in(conn, task);
-		if (rc) {
-			spin_unlock(&conn->session->lock);
-			break;
-		}
-
-		if (tcp_conn->in.datalen) {
-			struct iscsi_tcp_task *tcp_task = task->dd_data;
-			struct hash_desc *rx_hash = NULL;
-			struct scsi_data_buffer *sdb = scsi_in(task->sc);
-
-			/*
-			 * Setup copy of Data-In into the Scsi_Cmnd
-			 * Scatterlist case:
-			 * We set up the iscsi_segment to point to the next
-			 * scatterlist entry to copy to. As we go along,
-			 * we move on to the next scatterlist entry and
-			 * update the digest per-entry.
-			 */
-			if (conn->datadgst_en &&
-			    !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD))
-				rx_hash = tcp_conn->rx_hash;
-
-			ISCSI_DBG_TCP(conn, "iscsi_tcp_begin_data_in( "
-				     "offset=%d, datalen=%d)\n",
-				      tcp_task->data_offset,
-				      tcp_conn->in.datalen);
-			task->last_xfer = jiffies;
-			rc = iscsi_segment_seek_sg(&tcp_conn->in.segment,
-						   sdb->table.sgl,
-						   sdb->table.nents,
-						   tcp_task->data_offset,
-						   tcp_conn->in.datalen,
-						   iscsi_tcp_process_data_in,
-						   rx_hash);
-			spin_unlock(&conn->session->lock);
-			return rc;
-		}
-		rc = __iscsi_complete_pdu(conn, hdr, NULL, 0);
-		spin_unlock(&conn->session->lock);
-		break;
-	case ISCSI_OP_SCSI_CMD_RSP:
-		if (tcp_conn->in.datalen) {
-			iscsi_tcp_data_recv_prep(tcp_conn);
-			return 0;
-		}
-		rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
-		break;
-	case ISCSI_OP_R2T:
-		spin_lock(&conn->session->lock);
-		task = iscsi_itt_to_ctask(conn, hdr->itt);
-		if (!task)
-			rc = ISCSI_ERR_BAD_ITT;
-		else if (ahslen)
-			rc = ISCSI_ERR_AHSLEN;
-		else if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
-			task->last_xfer = jiffies;
-			rc = iscsi_tcp_r2t_rsp(conn, task);
-		} else
-			rc = ISCSI_ERR_PROTO;
-		spin_unlock(&conn->session->lock);
-		break;
-	case ISCSI_OP_LOGIN_RSP:
-	case ISCSI_OP_TEXT_RSP:
-	case ISCSI_OP_REJECT:
-	case ISCSI_OP_ASYNC_EVENT:
-		/*
-		 * It is possible that we could get a PDU with a buffer larger
-		 * than 8K, but there are no targets that currently do this.
-		 * For now we fail until we find a vendor that needs it
-		 */
-		if (ISCSI_DEF_MAX_RECV_SEG_LEN < tcp_conn->in.datalen) {
-			iscsi_conn_printk(KERN_ERR, conn,
-					  "iscsi_tcp: received buffer of "
-					  "len %u but conn buffer is only %u "
-					  "(opcode %0x)\n",
-					  tcp_conn->in.datalen,
-					  ISCSI_DEF_MAX_RECV_SEG_LEN, opcode);
-			rc = ISCSI_ERR_PROTO;
-			break;
-		}
-
-		/* If there's data coming in with the response,
-		 * receive it to the connection's buffer.
-		 */
-		if (tcp_conn->in.datalen) {
-			iscsi_tcp_data_recv_prep(tcp_conn);
-			return 0;
-		}
-	/* fall through */
-	case ISCSI_OP_LOGOUT_RSP:
-	case ISCSI_OP_NOOP_IN:
-	case ISCSI_OP_SCSI_TMFUNC_RSP:
-		rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
-		break;
-	default:
-		rc = ISCSI_ERR_BAD_OPCODE;
-		break;
-	}
-
-	if (rc == 0) {
-		/* Anything that comes with data should have
-		 * been handled above. */
-		if (tcp_conn->in.datalen)
-			return ISCSI_ERR_PROTO;
-		iscsi_tcp_hdr_recv_prep(tcp_conn);
-	}
-
-	return rc;
-}
-
-/**
- * iscsi_tcp_hdr_recv_done - process PDU header
- *
- * This is the callback invoked when the PDU header has
- * been received. If the header is followed by additional
- * header segments, we go back for more data.
- */
-static int
-iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn,
-			struct iscsi_segment *segment)
-{
-	struct iscsi_conn *conn = tcp_conn->iscsi_conn;
-	struct iscsi_hdr *hdr;
-
-	/* Check if there are additional header segments
-	 * *prior* to computing the digest, because we
-	 * may need to go back to the caller for more.
-	 */
-	hdr = (struct iscsi_hdr *) tcp_conn->in.hdr_buf;
-	if (segment->copied == sizeof(struct iscsi_hdr) && hdr->hlength) {
-		/* Bump the header length - the caller will
-		 * just loop around and get the AHS for us, and
-		 * call again. */
-		unsigned int ahslen = hdr->hlength << 2;
-
-		/* Make sure we don't overflow */
-		if (sizeof(*hdr) + ahslen > sizeof(tcp_conn->in.hdr_buf))
-			return ISCSI_ERR_AHSLEN;
-
-		segment->total_size += ahslen;
-		segment->size += ahslen;
-		return 0;
-	}
-
-	/* We're done processing the header. See if we're doing
-	 * header digests; if so, set up the recv_digest buffer
-	 * and go back for more. */
-	if (conn->hdrdgst_en &&
-	    !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) {
-		if (segment->digest_len == 0) {
-			/*
-			 * Even if we offload the digest processing we
-			 * splice it in so we can increment the skb/segment
-			 * counters in preparation for the data segment.
-			 */
-			iscsi_tcp_segment_splice_digest(segment,
-							segment->recv_digest);
-			return 0;
-		}
-
-		iscsi_tcp_dgst_header(tcp_conn->rx_hash, hdr,
-				      segment->total_copied - ISCSI_DIGEST_SIZE,
-				      segment->digest);
-
-		if (!iscsi_tcp_dgst_verify(tcp_conn, segment))
-			return ISCSI_ERR_HDR_DGST;
-	}
-
-	tcp_conn->in.hdr = hdr;
-	return iscsi_tcp_hdr_dissect(conn, hdr);
-}
-
-/**
- * iscsi_tcp_recv_segment_is_hdr - tests if we are reading in a header
- * @tcp_conn: iscsi tcp conn
- *
- * returns non zero if we are currently processing or setup to process
- * a header.
- */
-inline int iscsi_tcp_recv_segment_is_hdr(struct iscsi_tcp_conn *tcp_conn)
-{
-	return tcp_conn->in.segment.done == iscsi_tcp_hdr_recv_done;
-}
-EXPORT_SYMBOL_GPL(iscsi_tcp_recv_segment_is_hdr);
-
-/**
- * iscsi_tcp_recv_skb - Process skb
- * @conn: iscsi connection
- * @skb: network buffer with header and/or data segment
- * @offset: offset in skb
- * @offload: bool indicating if transfer was offloaded
- *
- * Will return status of transfer in status. And will return
- * number of bytes copied.
- */
-int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb,
-		       unsigned int offset, bool offloaded, int *status)
-{
-	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
-	struct iscsi_segment *segment = &tcp_conn->in.segment;
-	struct skb_seq_state seq;
-	unsigned int consumed = 0;
-	int rc = 0;
-
-	ISCSI_DBG_TCP(conn, "in %d bytes\n", skb->len - offset);
-	/*
-	 * Update for each skb instead of pdu, because over slow networks a
-	 * data_in's data could take a while to read in. We also want to
-	 * account for r2ts.
-	 */
-	conn->last_recv = jiffies;
-
-	if (unlikely(conn->suspend_rx)) {
-		ISCSI_DBG_TCP(conn, "Rx suspended!\n");
-		*status = ISCSI_TCP_SUSPENDED;
-		return 0;
-	}
-
-	if (offloaded) {
-		segment->total_copied = segment->total_size;
-		goto segment_done;
-	}
-
-	skb_prepare_seq_read(skb, offset, skb->len, &seq);
-	while (1) {
-		unsigned int avail;
-		const u8 *ptr;
-
-		avail = skb_seq_read(consumed, &ptr, &seq);
-		if (avail == 0) {
-			ISCSI_DBG_TCP(conn, "no more data avail. Consumed %d\n",
-				      consumed);
-			*status = ISCSI_TCP_SKB_DONE;
-			skb_abort_seq_read(&seq);
-			goto skb_done;
-		}
-		BUG_ON(segment->copied >= segment->size);
-
-		ISCSI_DBG_TCP(conn, "skb %p ptr=%p avail=%u\n", skb, ptr,
-			      avail);
-		rc = iscsi_tcp_segment_recv(tcp_conn, segment, ptr, avail);
-		BUG_ON(rc == 0);
-		consumed += rc;
-
-		if (segment->total_copied >= segment->total_size) {
-			skb_abort_seq_read(&seq);
-			goto segment_done;
-		}
-	}
-
-segment_done:
-	*status = ISCSI_TCP_SEGMENT_DONE;
-	ISCSI_DBG_TCP(conn, "segment done\n");
-	rc = segment->done(tcp_conn, segment);
-	if (rc != 0) {
-		*status = ISCSI_TCP_CONN_ERR;
-		ISCSI_DBG_TCP(conn, "Error receiving PDU, errno=%d\n", rc);
-		iscsi_conn_failure(conn, rc);
-		return 0;
-	}
-	/* The done() functions sets up the next segment. */
-
-skb_done:
-	conn->rxdata_octets += consumed;
-	return consumed;
-}
-EXPORT_SYMBOL_GPL(iscsi_tcp_recv_skb);
-
-/**
- * iscsi_tcp_task_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
- * @conn: iscsi connection
- * @task: scsi command task
- * @sc: scsi command
- */
-int iscsi_tcp_task_init(struct iscsi_task *task)
-{
-	struct iscsi_tcp_task *tcp_task = task->dd_data;
-	struct iscsi_conn *conn = task->conn;
-	struct scsi_cmnd *sc = task->sc;
-	int err;
-
-	if (!sc) {
-		/*
-		 * mgmt tasks do not have a scatterlist since they come
-		 * in from the iscsi interface.
-		 */
-		ISCSI_DBG_TCP(conn, "mtask deq [itt 0x%x]\n", task->itt);
-
-		return conn->session->tt->init_pdu(task, 0, task->data_count);
-	}
-
-	BUG_ON(kfifo_len(&tcp_task->r2tqueue));
-	tcp_task->exp_datasn = 0;
-
-	/* Prepare PDU, optionally w/ immediate data */
-	ISCSI_DBG_TCP(conn, "task deq [itt 0x%x imm %d unsol %d]\n",
-		      task->itt, task->imm_count, task->unsol_r2t.data_length);
-
-	err = conn->session->tt->init_pdu(task, 0, task->imm_count);
-	if (err)
-		return err;
-	task->imm_count = 0;
-	return 0;
-}
-EXPORT_SYMBOL_GPL(iscsi_tcp_task_init);
-
-static struct iscsi_r2t_info *iscsi_tcp_get_curr_r2t(struct iscsi_task *task)
-{
-	struct iscsi_session *session = task->conn->session;
-	struct iscsi_tcp_task *tcp_task = task->dd_data;
-	struct iscsi_r2t_info *r2t = NULL;
-
-	if (iscsi_task_has_unsol_data(task))
-		r2t = &task->unsol_r2t;
-	else {
-		spin_lock_bh(&session->lock);
-		if (tcp_task->r2t) {
-			r2t = tcp_task->r2t;
-			/* Continue with this R2T? */
-			if (r2t->data_length <= r2t->sent) {
-				ISCSI_DBG_TCP(task->conn,
-					      "  done with r2t %p\n", r2t);
-				kfifo_in(&tcp_task->r2tpool.queue,
-					    (void *)&tcp_task->r2t,
-					    sizeof(void *));
-				tcp_task->r2t = r2t = NULL;
-			}
-		}
-
-		if (r2t == NULL) {
-			if (kfifo_out(&tcp_task->r2tqueue,
-			    (void *)&tcp_task->r2t, sizeof(void *)) !=
-			    sizeof(void *))
-				r2t = NULL;
-			else
-				r2t = tcp_task->r2t;
-		}
-		spin_unlock_bh(&session->lock);
-	}
-
-	return r2t;
-}
-
-/**
- * iscsi_tcp_task_xmit - xmit normal PDU task
- * @task: iscsi command task
- *
- * We're expected to return 0 when everything was transmitted successfully,
- * -EAGAIN if there's still data in the queue, or != 0 for any other kind
- * of error.
- */
-int iscsi_tcp_task_xmit(struct iscsi_task *task)
-{
-	struct iscsi_conn *conn = task->conn;
-	struct iscsi_session *session = conn->session;
-	struct iscsi_r2t_info *r2t;
-	int rc = 0;
-
-flush:
-	/* Flush any pending data first. */
-	rc = session->tt->xmit_pdu(task);
-	if (rc < 0)
-		return rc;
-
-	/* mgmt command */
-	if (!task->sc) {
-		if (task->hdr->itt == RESERVED_ITT)
-			iscsi_put_task(task);
-		return 0;
-	}
-
-	/* Are we done already? */
-	if (task->sc->sc_data_direction != DMA_TO_DEVICE)
-		return 0;
-
-	r2t = iscsi_tcp_get_curr_r2t(task);
-	if (r2t == NULL) {
-		/* Waiting for more R2Ts to arrive. */
-		ISCSI_DBG_TCP(conn, "no R2Ts yet\n");
-		return 0;
-	}
-
-	rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_DATA_OUT);
-	if (rc)
-		return rc;
-	iscsi_prep_data_out_pdu(task, r2t, (struct iscsi_data *) task->hdr);
-
-	ISCSI_DBG_TCP(conn, "sol dout %p [dsn %d itt 0x%x doff %d dlen %d]\n",
-		      r2t, r2t->datasn - 1, task->hdr->itt,
-		      r2t->data_offset + r2t->sent, r2t->data_count);
-
-	rc = conn->session->tt->init_pdu(task, r2t->data_offset + r2t->sent,
-					 r2t->data_count);
-	if (rc) {
-		iscsi_conn_failure(conn, ISCSI_ERR_XMIT_FAILED);
-		return rc;
-	}
-
-	r2t->sent += r2t->data_count;
-	goto flush;
-}
-EXPORT_SYMBOL_GPL(iscsi_tcp_task_xmit);
-
-struct iscsi_cls_conn *
-iscsi_tcp_conn_setup(struct iscsi_cls_session *cls_session, int dd_data_size,
-		      uint32_t conn_idx)
-
-{
-	struct iscsi_conn *conn;
-	struct iscsi_cls_conn *cls_conn;
-	struct iscsi_tcp_conn *tcp_conn;
-
-	cls_conn = iscsi_conn_setup(cls_session,
-				    sizeof(*tcp_conn) + dd_data_size, conn_idx);
-	if (!cls_conn)
-		return NULL;
-	conn = cls_conn->dd_data;
-	/*
-	 * due to strange issues with iser these are not set
-	 * in iscsi_conn_setup
-	 */
-	conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN;
-
-	tcp_conn = conn->dd_data;
-	tcp_conn->iscsi_conn = conn;
-	tcp_conn->dd_data = conn->dd_data + sizeof(*tcp_conn);
-	return cls_conn;
-}
-EXPORT_SYMBOL_GPL(iscsi_tcp_conn_setup);
-
-void iscsi_tcp_conn_teardown(struct iscsi_cls_conn *cls_conn)
-{
-	iscsi_conn_teardown(cls_conn);
-}
-EXPORT_SYMBOL_GPL(iscsi_tcp_conn_teardown);
-
-int iscsi_tcp_r2tpool_alloc(struct iscsi_session *session)
-{
-	int i;
-	int cmd_i;
-
-	/*
-	 * initialize per-task: R2T pool and xmit queue
-	 */
-	for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
-	        struct iscsi_task *task = session->cmds[cmd_i];
-		struct iscsi_tcp_task *tcp_task = task->dd_data;
-
-		/*
-		 * pre-allocated x2 as much r2ts to handle race when
-		 * target acks DataOut faster than we data_xmit() queues
-		 * could replenish r2tqueue.
-		 */
-
-		/* R2T pool */
-		if (iscsi_pool_init(&tcp_task->r2tpool,
-				    session->max_r2t * 2, NULL,
-				    sizeof(struct iscsi_r2t_info))) {
-			goto r2t_alloc_fail;
-		}
-
-		/* R2T xmit queue */
-		if (kfifo_alloc(&tcp_task->r2tqueue,
-		      session->max_r2t * 4 * sizeof(void*), GFP_KERNEL)) {
-			iscsi_pool_free(&tcp_task->r2tpool);
-			goto r2t_alloc_fail;
-		}
-	}
-
-	return 0;
-
-r2t_alloc_fail:
-	for (i = 0; i < cmd_i; i++) {
-		struct iscsi_task *task = session->cmds[i];
-		struct iscsi_tcp_task *tcp_task = task->dd_data;
-
-		kfifo_free(&tcp_task->r2tqueue);
-		iscsi_pool_free(&tcp_task->r2tpool);
-	}
-	return -ENOMEM;
-}
-EXPORT_SYMBOL_GPL(iscsi_tcp_r2tpool_alloc);
-
-void iscsi_tcp_r2tpool_free(struct iscsi_session *session)
-{
-	int i;
-
-	for (i = 0; i < session->cmds_max; i++) {
-		struct iscsi_task *task = session->cmds[i];
-		struct iscsi_tcp_task *tcp_task = task->dd_data;
-
-		kfifo_free(&tcp_task->r2tqueue);
-		iscsi_pool_free(&tcp_task->r2tpool);
-	}
-}
-EXPORT_SYMBOL_GPL(iscsi_tcp_r2tpool_free);
-
-int iscsi_tcp_set_max_r2t(struct iscsi_conn *conn, char *buf)
-{
-	struct iscsi_session *session = conn->session;
-	unsigned short r2ts = 0;
-
-	sscanf(buf, "%hu", &r2ts);
-	if (session->max_r2t == r2ts)
-		return 0;
-
-	if (!r2ts || !is_power_of_2(r2ts))
-		return -EINVAL;
-
-	session->max_r2t = r2ts;
-	iscsi_tcp_r2tpool_free(session);
-	return iscsi_tcp_r2tpool_alloc(session);
-}
-EXPORT_SYMBOL_GPL(iscsi_tcp_set_max_r2t);
-
-void iscsi_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
-			      struct iscsi_stats *stats)
-{
-	struct iscsi_conn *conn = cls_conn->dd_data;
-
-	stats->txdata_octets = conn->txdata_octets;
-	stats->rxdata_octets = conn->rxdata_octets;
-	stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
-	stats->dataout_pdus = conn->dataout_pdus_cnt;
-	stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
-	stats->datain_pdus = conn->datain_pdus_cnt;
-	stats->r2t_pdus = conn->r2t_pdus_cnt;
-	stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
-	stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
-}
-EXPORT_SYMBOL_GPL(iscsi_tcp_conn_get_stats);