[PATCH 4/10][RFC] linux-iscsi driver

[PATCH 4/10][RFC] linux-iscsi driver

[Mike Christie]

[-- Attachment #1: Type: text/plain, Size: 25 bytes --]

Core iSCSI session code.

[-- Attachment #2: 04-iscsi-session.patch --]
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diff -Naurp scsi-misc-2.6.orig/drivers/scsi/iscsi-sfnet/iscsi-session.c scsi-misc-2.6.patch/drivers/scsi/iscsi-sfnet/iscsi-session.c
--- scsi-misc-2.6.orig/drivers/scsi/iscsi-sfnet/iscsi-session.c	1969-12-31 16:00:00.000000000 -0800
+++ scsi-misc-2.6.patch/drivers/scsi/iscsi-sfnet/iscsi-session.c	2005-01-10 12:22:24.875910647 -0800
@@ -0,0 +1,1533 @@
+/*
+ * iSCSI driver for Linux
+ * Copyright (C) 2001 Cisco Systems, Inc.
+ * Copyright (C) 2004 Mike Christie
+ * Copyright (C) 2004 IBM Corporation
+ * maintained by linux-iscsi-devel@lists.sourceforge.net
+ *
+ * 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.
+ *
+ * This File implements the funtions related to establishing and
+ * managing the session.
+ */
+#include <linux/blkdev.h>
+#include <linux/kthread.h>
+#include <linux/delay.h>
+#include <linux/inet.h>
+#include <scsi/scsi_device.h>
+
+#include "iscsi-session.h"
+#include "iscsi-ioctl.h"
+#include "iscsi-task.h"
+#include "iscsi-login.h"
+#include "iscsi-sfnet.h"
+
+/*
+ * list of initialized iscsi sessions - this should be replaced
+ * with a driver model equivalent if possible.
+ */
+LIST_HEAD(iscsi_sessions);
+static DECLARE_MUTEX(iscsi_session_sem);
+
+static void
+signal_iscsi_threads(struct iscsi_session *session)
+{
+	if (session->tx_task)
+		kill_proc(session->tx_task->pid, SIGHUP, 1);
+	if (session->rx_task)
+		kill_proc(session->rx_task->pid, SIGHUP, 1);
+}
+
+/* drop an iscsi session */
+void
+iscsi_drop_session(struct iscsi_session *session)
+{
+	if (!test_and_clear_bit(SESSION_ESTABLISHED, &session->control_bits))
+		return;
+
+	/* so we know whether to abort the connection */
+	session->session_drop_time = jiffies ? jiffies : 1;
+	signal_iscsi_threads(session);
+}
+
+static void
+handle_logout_timeouts(unsigned long data)
+{
+	struct iscsi_session *session = (struct iscsi_session *)data;
+
+	if (test_bit(SESSION_TERMINATED, &session->control_bits) ||
+	    !test_bit(SESSION_LOGOUT_REQUESTED, &session->control_bits))
+		return;
+	/*
+	 * we're waiting for tasks to complete before logging out. No need to
+	 * check the CmdSN window, since we won't be starting any more tasks.
+	 */
+	if (test_and_set_bit(SESSION_IN_LOGOUT, &session->control_bits)) {
+		/*
+		 * passed the deadline for a logout response, just drop the
+		 * session
+		 */
+		iscsi_host_err(session, "Logout response timed out, dropping "
+			       "session\n");
+		iscsi_drop_session(session);
+	} else {
+		iscsi_wake_tx_thread(TX_LOGOUT, session);
+		mod_timer(&session->logout_timer,
+			  jiffies + (session->logout_response_timeout * HZ));
+	}
+
+}
+
+/* caller must hold session->task_lock */
+void
+iscsi_request_logout(struct iscsi_session *session, int logout_timeout,
+		     int logout_response_timeout)
+{
+	int timeout;
+
+	if (test_and_set_bit(SESSION_LOGOUT_REQUESTED, &session->control_bits))
+		return;
+	/*
+	 * we should not be sending any new requests, so we do not want
+	 * the net timer to send pings. If we have active tasks then
+	 * we delay logout, but one way or another this session is going
+	 * so we do not need the net timer even if transport is bad.
+	 */
+	del_timer(&session->transport_timer);
+
+	session->logout_response_timeout = logout_response_timeout;
+	if (session->num_active_tasks == 0) {
+		timeout = session->logout_response_timeout;
+		set_bit(SESSION_IN_LOGOUT, &session->control_bits);
+		iscsi_wake_tx_thread(TX_LOGOUT, session);
+	} else
+		timeout = logout_timeout;
+	mod_timer(&session->logout_timer, jiffies + (timeout * HZ));
+}
+
+/*
+ * return value:
+ * 	1: login successfully.
+ *	0: Failed to login. No need to retry. Give up.
+ * 	-1: Failed to login. Retry.
+ */
+static int
+login_response_status(struct iscsi_session *session,
+		      enum iscsi_login_status login_status)
+{
+	int ret;
+
+	switch (login_status) {
+	case LOGIN_OK:
+		/* check the status class and detail */
+		ret = 1;
+		break;
+	case LOGIN_IO_ERROR:
+	case LOGIN_WRONG_PORTAL_GROUP:
+	case LOGIN_REDIRECTION_FAILED:
+		iscsi_disconnect(session);
+		ret = -1;
+		break;
+	default:
+		iscsi_disconnect(session);
+		/*
+		 * these are problems that will probably occur with any portal
+		 * of this target.
+		 */
+		if (session->commands_queued)
+			/*
+			 * the session has found LUNs and been used before, so
+			 * applications or the buffer cache may be expecting
+			 * it to continue working.  Keep trying to login even
+			 * though clearing the error may require
+			 * reconfiguration on the target.
+			 */
+			ret = -1;
+		else {
+			iscsi_host_err(session, "Session giving up on login "
+				       "attempts\n");
+			ret = 0;
+		}
+	}
+
+	return ret;
+}
+
+/*
+ * return value:
+ * 	2: login successfully.
+ * 	1: Redirected. Retry login.
+ *	0: Failed to login. No need to retry. Give up.
+ * 	-1: Failed to login. Retry.
+ */
+static int
+check_iscsi_status_class(struct iscsi_session *session, u8 status_class,
+			 u8 status_detail)
+{
+	switch (status_class) {
+	case ISCSI_STATUS_CLS_SUCCESS:
+		return 2;
+	case ISCSI_STATUS_CLS_REDIRECT:
+		switch (status_detail) {
+		case ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP:
+			return 1;	/* not really success, but we want to
+					 * retry immediately, with no delay
+					 */
+		case ISCSI_LOGIN_STATUS_TGT_MOVED_PERM:
+			/*
+			 * for a permanent redirect, we need to update the
+			 * portal address,  and then try again.
+			 */
+			spin_lock(&session->portal_lock);
+			/* reset the address in the current portal info */
+			memcpy(&session->portal.addr, &session->addr,
+			       sizeof(struct sockaddr));
+			spin_unlock(&session->portal_lock);
+                        return 1;       /* not really success, but we want to
+                                         * retry immediately, with no delay
+                                         */
+		default:
+			iscsi_host_err(session, "Login rejected: redirection "
+				       "type 0x%x not supported\n",
+				       status_detail);
+			iscsi_disconnect(session);
+			return -1;
+		}
+	case ISCSI_STATUS_CLS_INITIATOR_ERR:
+		iscsi_disconnect(session);
+
+		switch (status_detail) {
+		case ISCSI_LOGIN_STATUS_AUTH_FAILED:
+			iscsi_host_err(session, "Login rejected: Initiator "
+				       "failed authentication with target\n");
+			if (session->username || session->password_length ||
+			    session->bidirectional_auth)
+				/*
+				 * retry, and hope we can allocate the auth
+				 * structures next time.
+				 */
+				return -1;
+			else 
+				return 0;	
+		case ISCSI_LOGIN_STATUS_TGT_FORBIDDEN:
+			iscsi_host_err(session, "Login rejected: initiator "
+				       "failed authorization with target\n");
+			return 0;
+		case ISCSI_LOGIN_STATUS_TGT_NOT_FOUND:
+			iscsi_host_err(session, "Login rejected: initiator "
+				       "error - target not found (%02x/%02x)\n",
+				       status_class, status_detail);
+			return 0;
+		case ISCSI_LOGIN_STATUS_NO_VERSION:
+			/*
+			 * FIXME: if we handle multiple protocol versions,
+			 * before we log an error, try the other supported
+			 * versions.
+			 */
+			iscsi_host_err(session, "Login rejected: incompatible "
+				       "version (%02x/%02x), non-retryable, "
+				       "giving up\n", status_class,
+				       status_detail);
+			return 0;
+		default:
+			iscsi_host_err(session, "Login rejected: initiator "
+				       "error (%02x/%02x), non-retryable, "
+				       "giving up\n", status_class,
+				       status_detail);
+			return 0;
+		}
+	case ISCSI_STATUS_CLS_TARGET_ERR:
+		iscsi_host_err(session, "Login rejected: target error "
+			       "(%02x/%02x)\n", status_class, status_detail);
+		iscsi_disconnect(session);
+		/*
+		 * We have no idea what the problem is. But spec says initiator
+		 * may retry later.
+		 */
+		 return -1;
+	default:
+		iscsi_host_err(session, "Login response with unknown status "
+			       "class 0x%x, detail 0x%x\n", status_class,
+			       status_detail);
+		iscsi_disconnect(session);
+		return 0;
+	}
+}
+
+static void
+login_timed_out(unsigned long data)
+{
+	struct iscsi_session *session = (struct iscsi_session *)data;
+
+	iscsi_host_err(session, "Login phase timed out, timeout was set for "
+		       "%d secs\n", session->login_timeout);
+	kill_proc(session->rx_task->pid, SIGHUP, 1);
+}
+
+static int
+__establish_session(struct iscsi_session *session)
+{
+	int ret = -1;
+	u8 status_class;
+	u8 status_detail;
+	enum iscsi_login_status login_status;
+	struct timer_list login_timer;
+
+	/*
+	 * del FFP timers if running
+	 */
+	del_timer_sync(&session->transport_timer);
+	del_timer_sync(&session->logout_timer);
+	if (signal_pending(current))
+		flush_signals(current);
+
+	spin_lock(&session->portal_lock);
+	/*
+	 * Set almost everything based on the portal's settings.
+	 * Don't change the address, since a temporary redirect
+	 * may have already changed the address,
+	 * and we want to use the redirected address rather than
+	 * the portal's address.
+	 */
+	iscsi_set_portal_info(session);
+	spin_unlock(&session->portal_lock);
+
+	iscsi_disconnect(session);
+
+	init_timer(&login_timer);
+	if (session->login_timeout) {
+		login_timer.data = (unsigned long)session;
+		login_timer.function = login_timed_out;
+		login_timer.expires = jiffies + (session->login_timeout * HZ);
+		add_timer(&login_timer);
+	}
+
+	if (iscsi_connect(session)) {
+		iscsi_host_err(session, "establish_session failed. Could not "
+			       "connect to target\n");
+		goto done;
+	}
+
+	/*
+	 * Grab the config mutex a little early incase update_session
+	 * is running and something went wacko, the connect/login timer
+	 * above will break us out.
+	 */
+	if (down_interruptible(&session->config_mutex)) {
+		iscsi_host_err(session, "Failed to acquire mutex before "
+			       "login\n");
+		goto done;
+	}
+
+	/*
+	 * initialize session fields for the iscsi-login code
+	 */
+	session->type = ISCSI_SESSION_TYPE_NORMAL;
+	/*
+	 * use iSCSI default, unless declared otherwise by the
+	 * target during login
+	 */
+	session->max_xmit_data_segment_len =
+		DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
+	session->vendor_specific_keys = 1;
+	/*
+	 * we do not want to allocate memory here since this might be a
+	 * relogin with IO in progress, so we reuse the rx_buffer. Note
+	 * that extra care must be taken when using this buffer for both
+	 * send and recv here , becuase the net subsys does not copy data
+	 * in sendpage.
+	 */
+	login_status = iscsi_login(session, session->rx_buffer,
+				   sizeof(session->rx_buffer), &status_class,
+				   &status_detail);
+	up(&session->config_mutex);
+
+	ret = login_response_status(session, login_status);
+	if (ret < 1)
+		goto done;
+
+	ret = check_iscsi_status_class(session, status_class, status_detail);
+	if (ret < 2)
+		goto done;
+	/*
+	 * logged in ok, get the new session ready
+	 */
+	session->ever_established = 1;
+	session->window_closed = 0;
+	session->session_established_time = jiffies;
+	session->session_drop_time = 0;
+
+	session->nop_reply.ttt = ISCSI_RSVD_TASK_TAG;
+	INIT_LIST_HEAD(&session->nop_reply_list);
+
+	clear_bit(SESSION_WINDOW_CLOSED, &session->control_bits);
+	clear_bit(SESSION_REPLACEMENT_TIMEDOUT, &session->control_bits);
+	set_bit(SESSION_ESTABLISHED, &session->control_bits);
+
+	spin_lock_bh(&session->task_lock);
+	iscsi_mod_session_timer(session, session->idle_timeout);
+	spin_unlock_bh(&session->task_lock);
+	/*
+	 * ready to go, so wake up everyone waiting for the session
+	 * to be established
+	 */
+	wake_up(&session->login_wait_q);
+ done:
+	del_timer_sync(&login_timer);
+	/* cleanup after a possible timeout expiration */
+	if (signal_pending(current)) {
+		flush_signals(current);
+
+		if (test_bit(SESSION_TERMINATING, &session->control_bits))
+			return 0;
+		else
+			return -1;
+	}
+	return ret;
+}
+
+static char*
+strdup(char *str, int *err)
+{
+	int len;
+	char *s;
+
+	*err = 0;
+	len = strlen(str) + 1;
+	if (len == 1) {
+		*err = -EINVAL;
+		return NULL;
+	}
+
+	s = kmalloc(len, GFP_KERNEL);
+	if (!s) {
+		*err = -ENOMEM;
+		return NULL;
+	}
+
+	return strcpy(s, str);
+}
+
+/*
+ * return value:
+ * 	1: name/alias updated. Relogin required.
+ *	0: No updated needed.
+ * 	-Exxx: Failed to update.
+ */
+static int
+update_iscsi_strings(struct iscsi_session *session,
+		     struct iscsi_session_ioctl *ioctld)
+{
+	char *iname = NULL;
+	char *alias = NULL;
+	char *uname = NULL;
+	char *uname_in = NULL;
+	char *pw = NULL;
+	char *pw_in = NULL;
+	int rc = 0;
+
+	/*
+	 * update all the values or none of them
+	 */
+	if (!ioctld->initiator_name[0]) {
+		iscsi_host_err(session, "No InitiatorName\n");
+		return -EINVAL;
+	}
+	if (strcmp(ioctld->initiator_name, session->initiator_name)) {
+		iname = strdup(ioctld->initiator_name, &rc);
+		if (!iname) {
+			iscsi_host_err(session, "Failed to change "
+				       "InitiatorName from %s to %s\n",
+				       session->initiator_name,
+				       ioctld->initiator_name);
+			return rc;
+		}
+	}
+
+	if (ioctld->initiator_alias[0] && (!session->initiator_alias ||
+	    strcmp(ioctld->initiator_alias, session->initiator_alias))) {
+		alias = strdup(ioctld->initiator_alias, &rc);
+		if (!alias)
+			/* Alias is not ciritical so just print an error */
+			iscsi_host_err(session, "Failed to change "
+					"InitiatorAlias\n");
+	}
+
+	if (ioctld->username[0] && (!session->username ||
+	    strcmp(ioctld->username, session->username))) {
+		uname = strdup(ioctld->username, &rc);
+		if (!uname) {
+			iscsi_host_err(session, "Failed to change outgoing "
+				       "username\n");
+				goto failed;
+		}
+	}
+
+	if (ioctld->username_in[0] && (!session->username_in ||
+	    strcmp(ioctld->username_in, session->username_in))) {
+		uname_in = strdup(ioctld->username_in, &rc);
+		if (!uname_in) {
+			iscsi_host_err(session, "Failed to change incoming "
+				       "username\n");
+				goto failed;
+		}
+	}
+
+	if (ioctld->password_length && (!session->password ||
+	    session->password_length != ioctld->password_length ||
+	    memcmp(ioctld->password, session->password,
+		   session->password_length))) {
+		pw = kmalloc(ioctld->password_length + 1, GFP_KERNEL);
+		if (!pw) {
+			iscsi_host_err(session, "Failed to change outgoing "
+				       "password\n");
+			rc = -ENOMEM;
+			goto failed;
+		}
+		memcpy(pw, ioctld->password, ioctld->password_length);
+	}
+
+	if (ioctld->password_length_in && (!session->password_in ||
+	    session->password_length_in != ioctld->password_length_in ||
+	    memcmp(ioctld->password_in, session->password_in,
+		   session->password_length_in))) {
+		pw_in = kmalloc(ioctld->password_length_in + 1, GFP_KERNEL);
+		if (!pw_in) {
+			iscsi_host_err(session, "Failed to change incoming "
+				       "password\n");
+			rc = -ENOMEM;
+			goto failed;
+		}
+		memcpy(pw_in, ioctld->password_in, ioctld->password_length_in);
+	}
+
+	if (iname) {
+		kfree(session->initiator_name);	
+		session->initiator_name = iname;
+		rc = 1;
+	}
+	if (alias || (!ioctld->initiator_alias[0] &&
+		      session->initiator_alias[0])) {
+		kfree(session->initiator_alias);
+		session->initiator_alias = alias;
+		rc = 1;
+	}
+	if (uname || (!ioctld->username[0] && session->username)) {
+		kfree(session->username);
+		session->username = uname;
+		rc = 1;
+	}
+	if (uname_in || (!ioctld->username_in[0] && session->username_in)) {
+		kfree(session->username_in);
+		session->username_in = uname_in;
+		rc = 1;
+	}
+	if (pw || (!ioctld->password_length && session->password)) {
+		kfree(session->password);
+		session->password = pw;
+		session->password_length = ioctld->password_length;
+		rc = 1;
+	}
+	if (pw_in || (!ioctld->password_length_in && session->password_in)) {
+		kfree(session->password_in);
+		session->password_in = pw_in;
+		session->password_length_in = ioctld->password_length_in;
+		rc = 1;
+	}
+	return rc;
+ failed:
+	kfree(iname);
+	kfree(alias);
+	kfree(uname);
+	kfree(uname_in);
+	kfree(pw);
+	kfree(pw_in);
+	return rc;
+}
+
+static int
+alloc_auth_buffers(struct iscsi_session *session)
+{
+	if (!(session->bidirectional_auth || session->username ||
+	      session->password))
+		return 0;
+
+	if (session->auth_client_block)
+		return 0;
+
+	session->md5_tfm = crypto_alloc_tfm("md5", 0);
+	if (!session->md5_tfm)
+		return -ENOMEM;
+
+	session->auth_client_block =
+		kmalloc(sizeof(*session->auth_client_block), GFP_KERNEL);
+	if (!session->auth_client_block)
+		goto error;
+
+	session->auth_recv_string_block =
+		kmalloc(sizeof(*session->auth_recv_string_block), GFP_KERNEL);
+	if (!session->auth_recv_string_block)
+		goto error;
+
+	session->auth_send_string_block =
+		kmalloc(sizeof(*session->auth_send_string_block), GFP_KERNEL);
+	if (!session->auth_send_string_block)
+		goto error;
+
+	session->auth_recv_binary_block =
+		kmalloc(sizeof(*session->auth_recv_binary_block), GFP_KERNEL);
+	if (!session->auth_recv_binary_block)
+		goto error;
+
+	session->auth_send_binary_block =
+		kmalloc(sizeof(*session->auth_send_binary_block), GFP_KERNEL);
+	if (!session->auth_send_binary_block)
+		goto error;
+
+	return 0;
+
+ error:
+	crypto_free_tfm(session->md5_tfm);
+	kfree(session->auth_client_block);
+	kfree(session->auth_recv_string_block);
+	kfree(session->auth_send_string_block);
+	kfree(session->auth_recv_binary_block);
+	iscsi_host_err(session, "Session requires authentication but couldn't "
+		       "allocate authentication stuctures\n");
+	return -ENOMEM;
+}
+
+int
+iscsi_update_session(struct iscsi_session *session,
+		     struct iscsi_session_ioctl *ioctld)
+{
+	int rc = 0;
+	int relogin = 0;
+
+	if (down_interruptible(&session->config_mutex)) {
+		iscsi_host_err(session, "Session configuration update aborted "
+			       "by signal\n");
+		return -EINTR;
+	}
+	if (test_bit(SESSION_TERMINATED, &session->control_bits))
+		return -EINVAL;
+
+	if (ioctld->update && (ioctld->config_number < session->config_number))
+		/* this update is obsolete, ignore it */
+		goto err_exit;
+
+	if (ioctld->username_in[0] || ioctld->password_length_in)
+		session->bidirectional_auth = 1;
+	else
+		session->bidirectional_auth = 0;
+	rc = alloc_auth_buffers(session);
+	if (rc < 0)
+		goto err_exit;
+
+	rc = update_iscsi_strings(session, ioctld);
+	if (rc > 0)
+		relogin = 1;
+	else if (rc < 0) 
+		goto err_exit;
+
+	session->config_number = ioctld->config_number;
+
+	if (memcmp(session->isid, ioctld->isid, sizeof(session->isid))) {
+		memcpy(session->isid, ioctld->isid, sizeof(session->isid));
+		relogin = 1;
+	}
+
+	/*
+	 * after we release the mutex we cannot touch any field that
+	 * may be freed by a shutdown that is running at the same time
+	 */
+	up(&session->config_mutex);
+
+	/*
+	 * the portals are guarded by a spinlock instead of the config
+	 * mutex, so that we can request portal changes while a login is
+	 * occuring.
+	 */
+	spin_lock(&session->portal_lock);
+	if (iscsi_update_portal_info(&session->portal, &ioctld->portal))
+		relogin = 1;
+	spin_unlock(&session->portal_lock);
+
+	if (relogin)
+		if (test_bit(SESSION_ESTABLISHED, &session->control_bits)) {
+			spin_lock_bh(&session->task_lock);
+			iscsi_request_logout(session, 3,
+					     session->active_timeout);
+			spin_unlock_bh(&session->task_lock);
+		}
+	return 0;
+
+ err_exit:
+	up(&session->config_mutex);
+	return rc;
+}
+
+static int
+copy_iscsi_strings(struct iscsi_session *session,
+		   struct iscsi_session_ioctl *ioctld)
+{
+	int rc;
+
+	session->initiator_name = strdup(ioctld->initiator_name, &rc);
+	if (rc == -EINVAL) {
+		iscsi_host_err(session, "No InitiatorName\n");
+		return rc;
+	}
+	if (rc == -ENOMEM) {
+		iscsi_host_err(session, "Cannot allocate InitiatorName\n");
+		return rc;
+	}
+
+	session->initiator_alias = strdup(ioctld->initiator_alias, &rc);
+	/* Alias is not ciritical so just print an error */
+	if (!session->initiator_alias)
+		iscsi_host_err(session, "Cannot create InitiatorAlias\n");
+
+	session->target_name = strdup(ioctld->target_name, &rc);
+	if (rc == -EINVAL) {
+		iscsi_err("No TargetName\n");
+		return rc;
+	}
+	if (rc == -ENOMEM) {
+		iscsi_host_err(session, "Cannot allocate TargetName\n");
+		return rc;
+	}
+
+	session->username = strdup(ioctld->username, &rc);
+	if (rc == -ENOMEM) {
+		iscsi_host_err(session, "Failed to allocate outgoing "
+			       "username\n");
+		return rc;
+	}
+
+	session->username_in = strdup(ioctld->username_in, &rc);
+	if (rc == -ENOMEM) {
+		iscsi_host_err(session, "Failed to allocate incoming "
+			       "username\n");
+		return rc;
+	}
+
+	if (ioctld->password_length) {
+		session->password = kmalloc(ioctld->password_length + 1,
+					    GFP_KERNEL);
+		if (!session->password) {
+			iscsi_host_err(session, "Failed to allocate outgoing "
+				       "password\n");
+			return -ENOMEM;
+		}
+		memcpy(session->password, ioctld->password,
+		       ioctld->password_length);
+		session->password_length = ioctld->password_length;
+	}
+
+	if (ioctld->password_length_in) {
+		session->password_in = kmalloc(ioctld->password_length_in + 1,
+					       GFP_KERNEL);
+		if (!session->password_in) {
+			iscsi_host_err(session, "Failed to allocate incoming "
+				       "password\n");
+			return -ENOMEM;
+		}
+		memcpy(session->password_in, ioctld->password_in,
+		       ioctld->password_length_in);
+		session->password_length_in = ioctld->password_length_in;
+	}
+
+	return 0;
+}
+
+/**
+ * clear_session - clear session fields before attempting a re-login.
+ * @session: session to initialize.
+ **/
+static void
+clear_session(struct iscsi_session *session)
+{
+	struct iscsi_nop_info *nop_info, *tmp;
+
+	session->last_mgmt_itt = ISCSI_RSVD_TASK_TAG;
+
+	session->nop_reply.ttt = ISCSI_RSVD_TASK_TAG;
+	list_for_each_entry_safe(nop_info, tmp, &session->nop_reply_list,
+				 reply_list) {
+		list_del(&nop_info->reply_list);
+		kfree(nop_info);
+	}
+
+	clear_bit(SESSION_IN_LOGOUT, &session->control_bits);
+	clear_bit(SESSION_LOGOUT_REQUESTED, &session->control_bits);
+	session->logout_response_timeout = 0;
+}
+
+static void
+init_session_structure(struct iscsi_session *session,
+		       struct iscsi_session_ioctl *ioctld)
+{
+	INIT_LIST_HEAD(&session->list);
+	session->config_number = ioctld->config_number;
+	spin_lock_init(&session->portal_lock);
+	session->portal_group_tag = -1;
+	/* the first down should block */
+	sema_init(&session->config_mutex, 0);
+	INIT_LIST_HEAD(&session->pending_queue);
+	INIT_LIST_HEAD(&session->active_queue);
+	INIT_LIST_HEAD(&session->done_queue);
+	spin_lock_init(&session->task_lock);
+	INIT_LIST_HEAD(&(session->tx_task_head));
+	init_waitqueue_head(&session->tx_wait_q);
+	init_waitqueue_head(&session->login_wait_q);
+	sema_init(&session->tx_blocked, 0);
+	session->next_itt = 1;
+	session->time2wait = -1;
+	session->last_mgmt_itt = ISCSI_RSVD_TASK_TAG;
+	session->mgmt_task_complete = NULL;
+}
+
+/*
+ * Timer processing for a session in Full Feature Phase (minus logout).
+ * This timer may rearm itself.
+ */
+static void
+check_transport_timeouts(unsigned long data)
+{
+	struct iscsi_session *session = (struct iscsi_session *)data;
+	unsigned long timeout, next_timeout = 0, last_rx;
+
+	spin_lock(&session->task_lock);
+
+	if (test_bit(SESSION_TERMINATED, &session->control_bits) ||
+	    !test_bit(SESSION_ESTABLISHED, &session->control_bits))
+		goto done;
+
+	if (session->num_active_tasks)
+		timeout = session->active_timeout;
+	else
+		timeout = session->idle_timeout;
+	if (!timeout)
+		goto check_window;
+
+	timeout *= HZ;
+	last_rx = session->last_rx;
+
+	if (session->ping_timeout &&
+	    time_before_eq(last_rx + timeout + (session->ping_timeout * HZ),
+			   jiffies)) {
+		iscsi_host_err(session, "ping timeout of %d secs expired, "
+			       "last rx %lu, last ping %lu, now %lu\n",
+			       session->ping_timeout, last_rx,
+			       session->last_ping, jiffies);
+		iscsi_drop_session(session);
+		goto done;
+	}
+
+	if (time_before_eq(last_rx + timeout, jiffies)) {
+		if (time_before_eq(session->last_ping, last_rx)) {
+			/*
+			 * send a ping to try to provoke some
+			 * traffic
+			 */
+			session->last_ping = jiffies;
+			iscsi_wake_tx_thread(TX_PING, session);
+		}
+		next_timeout = last_rx + timeout + (session->ping_timeout * HZ);
+	} else
+		next_timeout = last_rx + timeout;
+
+ check_window:
+	/*
+	 * Do we still want to do this, or was it for an older
+	 * bad target that has been fixed?
+	 */
+	if (test_bit(SESSION_WINDOW_CLOSED, &session->control_bits)) {
+		/*
+		 * command window closed, ping once every 5 secs to ensure
+		 * we find out when it re-opens.  Target should send
+		 * us an update when it does, but we're not very
+		 * trusting of target correctness.
+		 */
+		if (time_before(session->last_ping + (5 * HZ), jiffies))
+			iscsi_wake_tx_thread(TX_PING, session);
+		if (next_timeout)
+			next_timeout = min(jiffies + (5 * HZ), next_timeout);
+		else
+			next_timeout = jiffies + (5 * HZ);
+	}
+
+	if (next_timeout)
+		mod_timer(&session->transport_timer, next_timeout);
+ done:
+	spin_unlock(&session->task_lock);
+}
+
+/**
+ * iscsi_mod_session_timer - modify the session's transport timer
+ * @session: iscsi session
+ * @timeout: timeout in seconds
+ *
+ * Note:
+ *    Must hold the task lock. And, if the new timeout was shorter
+ *    than the window_closed_timeout we will end up delaying the
+ *    new timeout. This should be rare and not really hurt anything
+ *    so we ignore it for now.
+ **/
+void
+iscsi_mod_session_timer(struct iscsi_session *session, int timeout)
+{
+	/*
+	 * reset last_rx and last_ping, so that it does not look like
+	 * we timed out when we are just switching states
+	 */
+	session->last_rx = jiffies;
+	session->last_ping = jiffies;
+
+	if (test_bit(SESSION_WINDOW_CLOSED, &session->control_bits))
+		return;
+
+	if (timeout)
+		mod_timer(&session->transport_timer, jiffies + (timeout * HZ));
+	else
+		del_timer(&session->transport_timer);
+}
+
+void
+iscsi_wake_tx_thread(int control_bit, struct iscsi_session *session)
+{
+	set_bit(control_bit, &session->control_bits);
+	set_bit(TX_WAKE, &session->control_bits);
+	wake_up(&session->tx_wait_q);
+}
+
+/**
+ * iscsi_wait_for_session - Wait for a session event to be established.
+ * @session: session to wait on.
+ * @ignore_timeout: If zero this will return when the replacement timeout fires.
+ *
+ * Description:
+ *    Returns 1 to indicate sesssion was established, or 0 to indicate
+ *    we timed out (if ignore_timeout == 0) or are terminating.
+ **/
+int
+iscsi_wait_for_session(struct iscsi_session *session, int ignore_timeout)
+{
+	int rc = 0;
+
+	while (1) {
+		wait_event_interruptible(session->login_wait_q,
+			test_bit(SESSION_ESTABLISHED, &session->control_bits) ||
+			test_bit(SESSION_TERMINATING, &session->control_bits) ||
+			(!ignore_timeout &&
+			 test_bit(SESSION_REPLACEMENT_TIMEDOUT,
+				  &session->control_bits)));
+
+		if (signal_pending(current))
+			flush_signals(current);
+
+		/*
+		 * need to test for termnination first to avoid falling
+		 * in the tx request loop for ever
+		 */
+		if (test_bit(SESSION_TERMINATING, &session->control_bits))
+			break;
+
+		if (test_bit(SESSION_ESTABLISHED, &session->control_bits)) {
+			rc = 1;
+			break;
+		}
+
+		if (!ignore_timeout && test_bit(SESSION_REPLACEMENT_TIMEDOUT,
+						 &session->control_bits))
+			break;
+	}
+
+	return rc;
+}
+
+/*
+ * Note the ordering matches the TX_* bit ordering.
+ * See iscsi_tx_thread comment, this basically a
+ * workqueue_struct.
+ */
+static struct {
+	void (* request_fn)(struct iscsi_session *);
+} tx_request_fns[] = {
+	{ iscsi_send_nop_out },
+	{ iscsi_send_task_mgmt },
+	{ iscsi_run_pending_queue },
+	{ iscsi_send_nop_replys },
+	{ iscsi_send_r2t_data },
+	{ iscsi_send_logout },
+};
+
+static void
+wait_for_tx_requests(struct iscsi_session *session)
+{
+	int req;
+
+	wait_event_interruptible(session->tx_wait_q,
+		test_and_clear_bit(TX_WAKE, &session->control_bits));
+
+	for (req = 0; req < TX_WAKE; req++) {
+		if (signal_pending(current))
+			return;
+		/*
+		 * when a logout is in progress or about to be sent
+		 * we do not start new requests, but we continue to
+		 * respond to R2Ts and Nops.
+		 */
+		if (test_and_clear_bit(req, &session->control_bits)) {
+			if (test_bit(SESSION_LOGOUT_REQUESTED,
+				     &session->control_bits) &&
+			    req <= TX_SCSI_COMMAND)
+				continue;
+
+			tx_request_fns[req].request_fn(session);
+		}
+	}
+}
+
+/**
+ * session_kthread_sleep - put a thread to sleep while waiting for shutdown.
+ * @session: session. 
+ *
+ * Description:
+ *    If for some reason we could not relogin into a session we sleep here
+ *    and and wait for someone to remove the session. Returns -EPERM to
+ *    indicate the thread should exit, or zero to indicate that the thread
+ *    can proceed with its normal action.
+ **/
+static inline int
+session_kthread_sleep(struct iscsi_session *session)
+{
+ retest:
+	set_current_state(TASK_INTERRUPTIBLE);
+	if (kthread_should_stop()) {
+		__set_current_state(TASK_RUNNING);
+		return -EPERM;
+	}
+
+	/*
+	 * We fall into this sleep, when someone has broken us
+	 * out of the lower loops that process requests or log us in,
+	 * terminate the session (session drops will not sleep here),
+	 * but have not (yet) cleaned up the host and called kthread_stop()).
+	 */
+	if (test_bit(SESSION_TERMINATING, &session->control_bits)) {
+		schedule();
+		if (signal_pending(current))
+			flush_signals(current);
+		goto retest;
+	}
+	__set_current_state(TASK_RUNNING);
+	return 0;
+}
+
+static void
+replacement_timed_out(unsigned long data)
+{
+	struct iscsi_session *session = (struct iscsi_session *)data;
+
+	iscsi_host_err(session, "replacement session time out after %d "
+		       "seconds, drop %lu, now %lu, failing all commands\n",
+		       session->replacement_timeout,
+		       session->session_drop_time, jiffies);
+	/*
+	 * need a lock or some real state code.
+	 */
+	if (test_bit(SESSION_ESTABLISHED, &session->control_bits) ||
+	    test_and_set_bit(SESSION_REPLACEMENT_TIMEDOUT,
+			     &session->control_bits))
+		return;
+
+	wake_up_all(&session->login_wait_q);
+}
+
+/*
+ * the writer thread
+ * TODO? - this could be nicely replaced with a work queue
+ * having a work struct replacing each TX_* req, but will
+ * using a singlethreaded_workqueue hurt perf when all
+ * targets use the same cpu_workqueue_struct?
+ * Or to reduce the number of threads, should we use one
+ * per cpu workqueue for the entire driver for all sends?
+ */
+static int
+iscsi_tx_thread(void *data)
+{
+	struct iscsi_session *session = data;
+	int rc;
+	unsigned long tmo;
+	struct timer_list replacement_timer;
+
+	init_timer(&replacement_timer);
+	replacement_timer.data = (unsigned long)session;
+	replacement_timer.function = replacement_timed_out;
+
+	current->flags |= PF_MEMALLOC;
+	allow_signal(SIGHUP);
+
+	/*
+	 * tell the rx thread that we're about to block, and that
+	 * it can safely call iscsi_sendmsg now as part of
+	 * the Login phase.
+	 */
+	up(&session->tx_blocked);
+
+	while (!session_kthread_sleep(session)) {
+		tmo = session->replacement_timeout * HZ;
+		if (tmo && session->session_drop_time)
+			mod_timer(&replacement_timer, jiffies + tmo);
+		rc = iscsi_wait_for_session(session, 1);
+		del_timer_sync(&replacement_timer);
+		if (!rc)
+			continue;
+
+		down(&session->tx_blocked);
+
+		/*
+		 * make sure we start sending commands again,
+		 * and clear any stale requests
+		 */
+		clear_bit(TX_TMF, &session->control_bits);
+		clear_bit(TX_LOGOUT, &session->control_bits);
+		clear_bit(TX_DATA, &session->control_bits);
+		set_bit(TX_PING, &session->control_bits);
+		set_bit(TX_SCSI_COMMAND, &session->control_bits);
+		set_bit(TX_WAKE, &session->control_bits);
+
+		while (!signal_pending(current))
+			wait_for_tx_requests(session);
+		flush_signals(current);
+
+		up(&session->tx_blocked);
+	}
+
+	return 0;
+}
+
+static int
+establish_session(struct iscsi_session *session, unsigned int login_delay)
+{
+	int rc;
+	unsigned long login_failures = 0;
+
+	while (!test_bit(SESSION_ESTABLISHED, &session->control_bits)) {
+		if (login_delay) {
+			iscsi_host_notice(session, "Waiting %u seconds before "
+					  "next login attempt\n", login_delay);
+			msleep_interruptible(login_delay * 1000);
+		}
+
+		if (test_bit(SESSION_TERMINATING, &session->control_bits))
+			return 0;
+		/*
+		 * wait for the tx thread to block or exit, ignoring signals.
+		 * the rx thread needs to know that the tx thread is not
+		 * running before it can safely close the socket and start
+		 * a new login phase on a new socket.
+		 */
+		down(&session->tx_blocked);
+		up(&session->tx_blocked);
+
+		rc = __establish_session(session);
+		if (rc > 0)
+			/* established or redirected */
+			login_failures = 0;
+		else if (rc < 0)
+			/* failed, retry */
+			login_failures++;
+		 else {
+			/* failed, give up */
+			iscsi_host_err(session, "Session giving up\n");
+			set_bit(SESSION_TERMINATING, &session->control_bits);
+			return 0;
+		}
+
+		/* slowly back off the frequency of login attempts */
+		if (login_failures == 0)
+			login_delay = 0;
+		else if (login_failures < 30)
+			login_delay = 1;
+		else if (login_failures < 48)
+			login_delay = 5;
+		else if (!test_bit(SESSION_REPLACEMENT_TIMEDOUT,
+				   &session->control_bits))
+			login_delay = 10;
+		 else
+			login_delay = 60;
+	}
+
+	return 1;
+}
+
+/**
+ * get_time2wait - return iSCSI DefaultTime2Wait
+ * @session: iscsi session
+ * @short_sessions: number of short sessions
+ *
+ * Description:
+ *   Return DefaultTime2Wait. However, if the session dies really
+ *   quicky after we reach FFP, we'll not be interoperable due to bugs
+ *   in the target (or this driver) that send illegal opcodes,
+ *   or disagreements about how to do CRC  calculations. To
+ *   avoid spinning, we track sessions with really short
+ *   lifetimes, and decrease the login frequency if we keep
+ *   getting session failures, like we do for login failures.
+ **/
+static unsigned int
+get_time2wait(struct iscsi_session *session, unsigned long *short_sessions)
+{
+	unsigned int login_delay = 0;
+
+	if (session->time2wait >= 0) {
+		login_delay = session->time2wait;
+		session->time2wait = -1;
+	} else
+		login_delay = session->def_time2wait;
+
+	if (time_before_eq(session->session_drop_time,
+		     	   session->session_established_time + (2 * HZ))) {
+		(*short_sessions)++;
+
+		if (*short_sessions < 30)
+			login_delay = max_t(unsigned int, login_delay, 1);
+		else if (*short_sessions < 48)
+			login_delay = max_t(unsigned int, login_delay, 5);
+		else if (!test_bit(SESSION_REPLACEMENT_TIMEDOUT,
+				   &session->control_bits))
+			login_delay = max_t(unsigned int, login_delay, 10);
+		else
+			login_delay = max_t(unsigned int, login_delay, 60);
+
+		iscsi_host_warn(session, "Session has ended quickly %lu times, "
+				"login delay %u seconds\n", *short_sessions,
+				login_delay);
+	} else
+		/* session lived long enough that the target is probably ok */
+		*short_sessions = 0;
+
+	return login_delay;
+}
+
+static int
+iscsi_rx_thread(void *data)
+{
+	struct iscsi_session *session = data;
+	struct iscsi_hdr hdr;
+	unsigned int login_delay = 0;
+	unsigned long short_sessions = 0;
+
+	current->flags |= PF_MEMALLOC;
+	allow_signal(SIGHUP);
+
+        while (!session_kthread_sleep(session)) {
+		if (!establish_session(session, login_delay))
+			continue;
+
+		while (!signal_pending(current))
+			iscsi_recv_pdu(session, &hdr, session->header_digest,
+				       session->rx_buffer, ISCSI_RXCTRL_SIZE,
+				       session->data_digest);
+		flush_signals(current);
+
+		login_delay = get_time2wait(session, &short_sessions);
+		/*
+		 * if this is a session drop we need to wait for
+		 * the tx thread to stop queueing and processing requests
+		 */
+		down(&session->tx_blocked);
+		up(&session->tx_blocked);
+
+		/*
+		 * session dropped unexpectedly, often due to
+		 * network problems
+		 */
+		iscsi_host_err(session, "Session dropped\n");
+		spin_lock_bh(&session->task_lock);
+		iscsi_flush_queues(session, ISCSI_MAX_LUNS, DID_BUS_BUSY);
+		clear_session(session);
+		spin_unlock_bh(&session->task_lock);
+	}
+	/*
+	 * If there are any commands left this will remove them.
+	 */
+	spin_lock_bh(&session->task_lock);
+	iscsi_flush_queues(session, ISCSI_MAX_LUNS, DID_NO_CONNECT);
+	spin_unlock_bh(&session->task_lock);
+
+	return 0;
+}
+
+static int
+start_session_threads(struct iscsi_session *session)
+{
+	/*
+	 * transport timer reused for replacement timer and
+	 * testing transport connection
+	 */
+	init_timer(&session->transport_timer);
+	session->transport_timer.data = (unsigned long)session;
+	session->transport_timer.function = check_transport_timeouts;
+
+	init_timer(&session->logout_timer);
+	session->logout_timer.data = (unsigned long)session;
+	session->logout_timer.function = handle_logout_timeouts;
+
+	session->tx_task = kthread_run(iscsi_tx_thread, session, "iscsi-tx");
+	if (IS_ERR(session->tx_task)) {
+		iscsi_host_err(session, "Failed to start tx thread, terminating"
+			       " session\n");
+		goto fail;
+	}
+
+	session->rx_task = kthread_run(iscsi_rx_thread, session, "iscsi-rx");
+	if (IS_ERR(session->rx_task)) {
+		iscsi_host_err(session, "Failed to start rx thread, terminating"
+			       " session\n");
+		goto shutdown_tx_thread;
+	}
+
+	return 0;
+
+ shutdown_tx_thread:
+	set_bit(SESSION_TERMINATING, &session->control_bits);
+	kthread_stop(session->tx_task);
+ fail:
+	return -EAGAIN;
+}
+
+static void
+free_session(struct iscsi_session *session)
+{
+	if (session->preallocated_task)
+		kmem_cache_free(iscsi_task_cache, session->preallocated_task);
+
+	if (session->mgmt_task)
+		kmem_cache_free(iscsi_task_cache, session->mgmt_task);
+
+	if (session->rx_tfm)
+		crypto_free_tfm(session->rx_tfm);
+	if (session->tx_tfm)
+		crypto_free_tfm(session->tx_tfm);
+	if (session->md5_tfm)
+		crypto_free_tfm(session->md5_tfm);
+
+	kfree(session->auth_client_block);
+	kfree(session->auth_recv_string_block);
+	kfree(session->auth_send_string_block);
+	kfree(session->auth_recv_binary_block);
+	kfree(session->auth_send_binary_block);
+	kfree(session->username);
+	kfree(session->password);
+	kfree(session->username_in);
+	kfree(session->password_in);
+	kfree(session->initiator_name);
+	kfree(session->initiator_alias);
+	kfree(session->target_name);
+	kfree(session->target_alias);
+}
+
+void
+iscsi_destroy_session(struct iscsi_session *session)
+{
+	set_bit(SESSION_TERMINATING, &session->control_bits);
+	clear_bit(SESSION_ESTABLISHED, &session->control_bits);
+
+	down(&iscsi_session_sem);
+	list_del(&session->list);
+	up(&iscsi_session_sem);
+
+	session->session_drop_time = jiffies ? jiffies : 1;
+	signal_iscsi_threads(session);
+
+	kthread_stop(session->tx_task);
+	kthread_stop(session->rx_task);
+
+	iscsi_disconnect(session);
+
+	set_bit(SESSION_TERMINATED, &session->control_bits);
+	del_timer_sync(&session->transport_timer);
+	del_timer_sync(&session->logout_timer);
+	/*
+	 * grab the config mutex to make sure update_session is not
+	 * accessing the session fields we are going to free
+	 */
+	down(&session->config_mutex);
+	free_session(session);
+	up(&session->config_mutex);
+}
+
+int
+iscsi_create_session(struct iscsi_session *session,
+		     struct iscsi_session_ioctl *ioctld)
+{
+	int rc;
+
+	init_session_structure(session, ioctld);
+
+	session->preallocated_task = kmem_cache_alloc(iscsi_task_cache,
+						      GFP_KERNEL);
+	if (!session->preallocated_task) {
+		iscsi_host_err(session, "Couldn't preallocate task\n");
+		rc = -ENOMEM;
+		goto free_session;
+	}
+
+	session->mgmt_task = kmem_cache_alloc(iscsi_task_cache, GFP_KERNEL);
+	if (!session->mgmt_task) {
+		iscsi_host_err(session, "Couldn't preallocate mgmt task\n");
+		rc = -ENOMEM;
+		goto free_session;
+	}
+	memset(session->mgmt_task, 0, sizeof(*session->mgmt_task));
+	iscsi_init_task(session->mgmt_task);
+
+	rc = copy_iscsi_strings(session, ioctld);
+	if (rc)
+		goto free_session;
+
+	memcpy(session->isid, ioctld->isid, sizeof(session->isid));
+
+	/*
+	 * FIXME: Do we have to check on both the username_in and
+	 * password_length_in. Same with iscsi_update_session as well? Smitha
+	 */
+	if (ioctld->username_in[0] || ioctld->password_length_in)
+		session->bidirectional_auth = 1;
+	else
+		session->bidirectional_auth = 0;
+	rc = alloc_auth_buffers(session);
+	if (rc)
+		goto free_session;
+
+	memcpy(&session->portal, &ioctld->portal, sizeof(ioctld->portal));
+	iscsi_set_portal(session);
+
+	/*
+	 * preallocate rx/tx_tfm, so that we do not have to possibly
+	 * call crypto_alloc_tfm (it uses GFP_KERNEL) while IO is queued.
+	 */
+	session->rx_tfm = crypto_alloc_tfm("crc32c", 0);
+	if (!session->rx_tfm) {
+		rc = -ENOMEM;
+		goto free_session;
+	}
+
+	session->tx_tfm = crypto_alloc_tfm("crc32c", 0);
+	if (!session->tx_tfm) {
+		rc = -ENOMEM;
+		goto free_session;
+	}
+
+	rc = start_session_threads(session);
+	up(&session->config_mutex);
+	if (rc)
+		goto free_session;
+
+	down(&iscsi_session_sem);
+	list_add_tail(&session->list, &iscsi_sessions);
+	up(&iscsi_session_sem);
+
+	wait_event_interruptible(session->login_wait_q,
+		test_bit(SESSION_ESTABLISHED, &session->control_bits));
+	if (!test_bit(SESSION_ESTABLISHED, &session->control_bits)) {
+		iscsi_destroy_session(session);
+		return -ENOTCONN;
+	}
+
+	return 0;
+	
+ free_session:
+	free_session(session);
+	return rc;
+}
+
+struct iscsi_session *
+iscsi_find_session(const char *target_name, u8 isid[6], int tpgt)
+{
+	struct iscsi_session *session;
+
+	down(&iscsi_session_sem);
+
+	list_for_each_entry(session, &iscsi_sessions, list) {
+		 if (!strcmp(session->target_name, target_name) &&
+		     !memcmp(session->isid, isid, sizeof(isid)) &&
+		     session->portal_group_tag == tpgt) {
+			if (scsi_host_get(session->shost)) {
+				up(&iscsi_session_sem);
+				return session;
+			}
+			break;
+		}
+	}
+
+	up(&iscsi_session_sem);
+	return NULL;
+}
+
+int
+iscsi_update_address(struct iscsi_session *session, char *address)
+{
+	struct sockaddr_in *addr;
+	char *tag;
+	char *port;
+	int err = 1;
+
+	tag = strrchr(address, ',');
+	if (tag) {
+		*tag = '\0';
+		tag++;
+	}
+
+	port = strrchr(address, ':');
+	if (port) {
+		*port = '\0';
+		port++;
+	}
+
+	/*
+	 * Still only ipv4 is supported. No access to ipv6
+	 * to test so feel free to implement it later...
+	 */
+	if (address[0] == '[') {
+		iscsi_host_err(session, "Driver does not support ipv6 "
+			       "addresses\n");
+		err = 0;
+		goto done;
+	}
+
+	addr = (struct sockaddr_in *)&session->addr;
+	addr->sin_addr.s_addr = in_aton(address);
+	if (port)
+		addr->sin_port = htons(simple_strtoul(port, NULL, 0));
+	else
+		addr->sin_port = htons(ISCSI_TCP_PORT);
+
+ done:
+	/* restore the original strings */
+	if (tag) {
+		--tag;
+		*tag = ',';
+	}
+
+	if (port) {
+		--port;
+		*port = ':';
+	}
+
+	return err;
+}
diff -Naurp scsi-misc-2.6.orig/drivers/scsi/iscsi-sfnet/iscsi-session.h scsi-misc-2.6.patch/drivers/scsi/iscsi-sfnet/iscsi-session.h
--- scsi-misc-2.6.orig/drivers/scsi/iscsi-sfnet/iscsi-session.h	1969-12-31 16:00:00.000000000 -0800
+++ scsi-misc-2.6.patch/drivers/scsi/iscsi-sfnet/iscsi-session.h	2005-01-10 12:22:24.875910647 -0800
@@ -0,0 +1,232 @@
+/*
+ * iSCSI driver for Linux
+ * Copyright (C) 2001 Cisco Systems, Inc.
+ * Copyright (C) 2004 Mike Christie
+ * Copyright (C) 2004 IBM Corporation
+ * maintained by linux-iscsi-devel@lists.sourceforge.net
+ *
+ * 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.
+ *
+ * define the iSCSI session structure needed by the login library
+ */
+#ifndef ISCSI_SESSION_H_
+#define ISCSI_SESSION_H_
+
+#include <linux/crypto.h>
+#include <linux/socket.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+
+#include "iscsi-auth-client.h"
+#include "iscsi-portal.h"
+
+struct iscsi_session_ioctl;
+struct iscsi_task;
+
+/* used for replying to NOPs */
+struct iscsi_nop_info {
+	struct list_head reply_list;
+	u32 ttt;
+	unsigned char lun[8];
+};
+
+#define ISCSI_RXCTRL_SIZE PAGE_SIZE
+
+struct iscsi_session {
+	struct Scsi_Host	*shost;
+	struct list_head	list;
+	/*
+	 * the config mutex along with the portal lock protect
+	 * and serialize the creation and update of session info
+	 */
+	struct semaphore	config_mutex;
+	u32			config_number;
+	/*
+	 * iSCSI settings
+	 */
+	unsigned char		*initiator_name;
+	unsigned char		*initiator_alias;
+	unsigned char		*target_name;
+	unsigned char		*target_alias;
+	u8			isid[6];
+	u16			tsih;
+	u32			cmd_sn;
+	u32			exp_cmd_sn;
+	u32			max_cmd_sn;
+	u32			exp_stat_sn;
+	int			immediate_data;
+	int			initial_r2t;
+	/* the value we declare */
+	int			max_recv_data_segment_len; 
+	/* the value declared by the target */
+	int			max_xmit_data_segment_len;
+	int			first_burst_len;
+	int			max_burst_len;
+	int			data_pdu_in_order;
+	int			data_seq_in_order;
+	int			def_time2wait;
+	int			def_time2retain;
+	int			header_digest;
+	int			data_digest;
+	int			type;
+	int			current_stage;
+	int			next_stage;
+	int			partial_response;
+	int			portal_group_tag;
+	int			vendor_specific_keys;
+	int			send_async_text;
+	unsigned int		irrelevant_keys_bitmap;
+	u32			next_itt;
+	long			time2wait;
+	/*
+	 * Authentication settings
+	 */
+	char			*username;
+	unsigned char		*password;
+	int			password_length;
+	char			*username_in;
+	unsigned char		*password_in;
+	int			password_length_in;
+	struct crypto_tfm	*md5_tfm;
+	int			bidirectional_auth;
+	struct iscsi_acl	*auth_client_block;
+	struct auth_str_block	*auth_recv_string_block;
+	struct auth_str_block	*auth_send_string_block;
+	struct auth_large_binary *auth_recv_binary_block;
+	struct auth_large_binary *auth_send_binary_block;
+	/*
+	 * Portal/Network settings
+	 * support ipv4 when we finish the interface
+	 */
+	struct socket		*socket;
+	/* we only support ipv4 until we can find a setup to test */
+	struct sockaddr 	addr;
+	int			tcp_window_size;
+	spinlock_t		portal_lock;
+	struct iscsi_portal_info portal;
+	/*
+	 * various accounting sutff
+	 */
+	/*
+	 * *_time fields used to detect sessions that die as soon
+	 * as we hit FFP
+	 */
+	unsigned long		session_drop_time;
+	unsigned long		session_established_time;
+	int			ever_established;
+	int			commands_queued;
+	/*
+	 * timer fields
+	 */
+	struct timer_list	transport_timer;
+	struct timer_list	logout_timer;
+	unsigned long		last_rx;
+	unsigned long		last_ping;
+	unsigned long		window_closed;
+	int			login_timeout;
+	int			active_timeout;
+	int			idle_timeout;
+	int			ping_timeout;
+	int			abort_timeout;
+	int			reset_timeout;
+	int			replacement_timeout;
+	int			logout_response_timeout;
+	/*
+	 * iSCSI task/request
+	 * - Requests originating from SCSI-ml like scsi cmnds and
+	 * management functions are task backed.
+	 * - iSCSI requests like Nop, Logout or Login do not
+	 * have a struct iscsi_task to avoid allocating memory
+	 * when not needed.
+	 *
+	 * The task lock protects the task/cmnd queues and the
+	 * access to the task when the tx and rx thread could
+	 * be accessing it at the same time.
+	 */
+	spinlock_t		task_lock;
+	struct iscsi_task	*preallocated_task;
+	struct list_head	pending_queue;
+	struct list_head	active_queue;
+	struct list_head	done_queue;
+	struct list_head	tx_task_head;
+	int			num_active_tasks;
+	struct iscsi_nop_info	nop_reply;
+	struct list_head	nop_reply_list;
+	/* itt of the last mgmt task we sent */
+	u32			last_mgmt_itt;
+	/* preallocated task for TMFs */
+	struct iscsi_task	*mgmt_task;
+	struct completion	*mgmt_task_complete;
+	/*
+	 * thread control stuff
+	 */
+	unsigned long		control_bits;
+	wait_queue_head_t	tx_wait_q;
+	wait_queue_head_t	login_wait_q;
+	struct semaphore	tx_blocked;
+	struct task_struct	*rx_task;
+	struct task_struct	*tx_task;
+	struct crypto_tfm	*rx_tfm;
+	struct crypto_tfm	*tx_tfm;
+	/*
+	 * preallocated buffer for iSCSI requests that have
+	 * data, and do not originate from scsi-ml
+	 */
+	unsigned char		rx_buffer[ISCSI_RXCTRL_SIZE];
+};
+
+/* session control bits */
+enum {
+	/*
+	 * the tx bits match the tx_request array in
+	 * iscsi-initiator.c, so if you modify this don't forget
+	 */
+	TX_PING,		/* NopOut, reply requested */
+	TX_TMF,
+	TX_SCSI_COMMAND,
+	TX_NOP_REPLY,		/* reply to a Nop-in from the target */
+	TX_DATA,
+	TX_LOGOUT,
+	TX_WAKE,
+
+	SESSION_CREATED,
+	SESSION_RELEASING,
+	SESSION_REPLACEMENT_TIMEDOUT,
+	SESSION_ESTABLISHED,
+	SESSION_LOGOUT_REQUESTED,
+	SESSION_IN_LOGOUT,
+	SESSION_WINDOW_CLOSED,
+	SESSION_TERMINATING,
+	SESSION_TERMINATED,
+};
+
+extern void iscsi_wake_tx_thread(int control_bit,
+				 struct iscsi_session *session);
+extern void iscsi_request_logout(struct iscsi_session *session, int logout,
+				 int logout_response);
+extern void iscsi_drop_session(struct iscsi_session *session);
+extern int iscsi_update_session(struct iscsi_session *session,
+				struct iscsi_session_ioctl *ioctld);
+extern int iscsi_create_session(struct iscsi_session *session,
+				struct iscsi_session_ioctl *ioctld);
+extern void iscsi_destroy_session(struct iscsi_session *session);
+extern struct iscsi_session *iscsi_find_session(const char *target_name,
+						u8 isid[6], int tpgt);
+extern int iscsi_update_address(struct iscsi_session *session, char *address);
+extern int iscsi_wait_for_session(struct iscsi_session *session,
+				  int ignore_timeout);
+extern void iscsi_mod_session_timer(struct iscsi_session *session, int timeout);
+
+extern struct list_head iscsi_sessions;
+
+#endif

Re: [PATCH 4/10][RFC] linux-iscsi driver

[Christoph Hellwig]

On Mon, Jan 10, 2005 at 02:57:25PM -0800, Mike Christie wrote:
> Core iSCSI session code.

Can you kill the ugly iscsi-sfnet name?  We also don't call out networking
code ipv4-swansea ;-)  Simple iscsi should be enough, or if you think that's
confusing vs driver for hardware offload cards maybe sw-iscsi.

Re: [PATCH 4/10][RFC] linux-iscsi driver

[James Bottomley]

On Mon, 2005-01-10 at 23:24 +0000, Christoph Hellwig wrote:
> Can you kill the ugly iscsi-sfnet name?  We also don't call out networking
> code ipv4-swansea ;-)  Simple iscsi should be enough, or if you think that's
> confusing vs driver for hardware offload cards maybe sw-iscsi.

Please not that can of worms again.

For the time being I think iscsi-sfnet will do since there's still one
other possible linux iscsi stack around.  And we would probably have
called our networking code ipv4-swansea if we also had an ipv4-bsd or
something else one could use.

In the long run, there will be only a single iscsi driver, and it can be
renamed as such, but in the short term we're not ready to choose.

James

Re: [PATCH 4/10][RFC] linux-iscsi driver

[Dave Wysochanski]

James Bottomley wrote:

> On Mon, 2005-01-10 at 23:24 +0000, Christoph Hellwig wrote:
> > Can you kill the ugly iscsi-sfnet name?  We also don't call out 
> networking
> > code ipv4-swansea ;-)  Simple iscsi should be enough, or if you 
> think that's
> > confusing vs driver for hardware offload cards maybe sw-iscsi.
>
> Please not that can of worms again.
>
> For the time being I think iscsi-sfnet will do since there's still one
> other possible linux iscsi stack around.  And we would probably have
> called our networking code ipv4-swansea if we also had an ipv4-bsd or
> something else one could use.
>

What is the other possible iscsi stack?


> In the long run, there will be only a single iscsi driver, and it can be
> renamed as such, but in the short term we're not ready to choose.
>
> James
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

Re: [PATCH 4/10][RFC] linux-iscsi driver

[James Bottomley]

On Mon, 2005-01-10 at 23:35 -0500, Dave Wysochanski wrote:
> What is the other possible iscsi stack?

The same one as the last time you asked: the pyx one.

James

Re: [PATCH 4/10][RFC] linux-iscsi driver

[Christoph Hellwig]

On Mon, Jan 10, 2005 at 06:45:18PM -0600, James Bottomley wrote:
> On Mon, 2005-01-10 at 23:24 +0000, Christoph Hellwig wrote:
> > Can you kill the ugly iscsi-sfnet name?  We also don't call out networking
> > code ipv4-swansea ;-)  Simple iscsi should be enough, or if you think that's
> > confusing vs driver for hardware offload cards maybe sw-iscsi.
> 
> Please not that can of worms again.
> 
> For the time being I think iscsi-sfnet will do since there's still one
> other possible linux iscsi stack around.  And we would probably have
> called our networking code ipv4-swansea if we also had an ipv4-bsd or
> something else one could use.
> 
> In the long run, there will be only a single iscsi driver, and it can be
> renamed as such, but in the short term we're not ready to choose.

I disagree.  We have been concentrating on this driver for a long time,
everyone whoe thinks his driver should have been _the_ software initiator
should have complained for a long time.

Re: [PATCH 4/10][RFC] linux-iscsi driver

[James Bottomley]

On Tue, 2005-01-11 at 09:59 +0000, Christoph Hellwig wrote:
> > For the time being I think iscsi-sfnet will do since there's still one
> > other possible linux iscsi stack around.  And we would probably have
> > called our networking code ipv4-swansea if we also had an ipv4-bsd or
> > something else one could use.
> > 
> > In the long run, there will be only a single iscsi driver, and it can be
> > renamed as such, but in the short term we're not ready to choose.
> 
> I disagree.  We have been concentrating on this driver for a long time,
> everyone whoe thinks his driver should have been _the_ software initiator
> should have complained for a long time.

Well ... humour me.  If there's no other stack suitable for submission
within three months, this one can become iscsi and all later comers will
have to modify it to add their features.

James

Re: [PATCH 4/10][RFC] linux-iscsi driver

[Mike Christie]

Christoph Hellwig wrote:
> On Mon, Jan 10, 2005 at 02:57:25PM -0800, Mike Christie wrote:
> 
>>Core iSCSI session code.
> 
> 
> Can you kill the ugly iscsi-sfnet name?  We also don't call out networking
> code ipv4-swansea ;-)  Simple iscsi should be enough, or if you think that's
> confusing vs driver for hardware offload cards maybe sw-iscsi.

That was on my todo. I like iscsi. I think iscsi-sfnet actually stood 
for somthting about sourceforge. I do not know for sure though.

> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>