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|
/*******************************************************************************
* This file contains error recovery level two functions used by
* the iSCSI Target driver.
*
* \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
*
* Licensed to the Linux Foundation under the General Public License (GPL) version 2.
*
* Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
*
* 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.
******************************************************************************/
#include <scsi/iscsi_proto.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include "iscsi_target_core.h"
#include "iscsi_target_datain_values.h"
#include "iscsi_target_util.h"
#include "iscsi_target_erl0.h"
#include "iscsi_target_erl1.h"
#include "iscsi_target_erl2.h"
#include "iscsi_target.h"
/*
* FIXME: Does RData SNACK apply here as well?
*/
void iscsit_create_conn_recovery_datain_values(
struct iscsi_cmd *cmd,
u32 exp_data_sn)
{
u32 data_sn = 0;
struct iscsi_conn *conn = cmd->conn;
cmd->next_burst_len = 0;
cmd->read_data_done = 0;
while (exp_data_sn > data_sn) {
if ((cmd->next_burst_len +
conn->conn_ops->MaxRecvDataSegmentLength) <
conn->sess->sess_ops->MaxBurstLength) {
cmd->read_data_done +=
conn->conn_ops->MaxRecvDataSegmentLength;
cmd->next_burst_len +=
conn->conn_ops->MaxRecvDataSegmentLength;
} else {
cmd->read_data_done +=
(conn->sess->sess_ops->MaxBurstLength -
cmd->next_burst_len);
cmd->next_burst_len = 0;
}
data_sn++;
}
}
void iscsit_create_conn_recovery_dataout_values(
struct iscsi_cmd *cmd)
{
u32 write_data_done = 0;
struct iscsi_conn *conn = cmd->conn;
cmd->data_sn = 0;
cmd->next_burst_len = 0;
while (cmd->write_data_done > write_data_done) {
if ((write_data_done + conn->sess->sess_ops->MaxBurstLength) <=
cmd->write_data_done)
write_data_done += conn->sess->sess_ops->MaxBurstLength;
else
break;
}
cmd->write_data_done = write_data_done;
}
static int iscsit_attach_active_connection_recovery_entry(
struct iscsi_session *sess,
struct iscsi_conn_recovery *cr)
{
spin_lock(&sess->cr_a_lock);
list_add_tail(&cr->cr_list, &sess->cr_active_list);
spin_unlock(&sess->cr_a_lock);
return 0;
}
static int iscsit_attach_inactive_connection_recovery_entry(
struct iscsi_session *sess,
struct iscsi_conn_recovery *cr)
{
spin_lock(&sess->cr_i_lock);
list_add_tail(&cr->cr_list, &sess->cr_inactive_list);
sess->conn_recovery_count++;
pr_debug("Incremented connection recovery count to %u for"
" SID: %u\n", sess->conn_recovery_count, sess->sid);
spin_unlock(&sess->cr_i_lock);
return 0;
}
struct iscsi_conn_recovery *iscsit_get_inactive_connection_recovery_entry(
struct iscsi_session *sess,
u16 cid)
{
struct iscsi_conn_recovery *cr;
spin_lock(&sess->cr_i_lock);
list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
if (cr->cid == cid) {
spin_unlock(&sess->cr_i_lock);
return cr;
}
}
spin_unlock(&sess->cr_i_lock);
return NULL;
}
void iscsit_free_connection_recovery_entires(struct iscsi_session *sess)
{
struct iscsi_cmd *cmd, *cmd_tmp;
struct iscsi_conn_recovery *cr, *cr_tmp;
spin_lock(&sess->cr_a_lock);
list_for_each_entry_safe(cr, cr_tmp, &sess->cr_active_list, cr_list) {
list_del(&cr->cr_list);
spin_unlock(&sess->cr_a_lock);
spin_lock(&cr->conn_recovery_cmd_lock);
list_for_each_entry_safe(cmd, cmd_tmp,
&cr->conn_recovery_cmd_list, i_conn_node) {
list_del(&cmd->i_conn_node);
cmd->conn = NULL;
spin_unlock(&cr->conn_recovery_cmd_lock);
iscsit_free_cmd(cmd);
spin_lock(&cr->conn_recovery_cmd_lock);
}
spin_unlock(&cr->conn_recovery_cmd_lock);
spin_lock(&sess->cr_a_lock);
kfree(cr);
}
spin_unlock(&sess->cr_a_lock);
spin_lock(&sess->cr_i_lock);
list_for_each_entry_safe(cr, cr_tmp, &sess->cr_inactive_list, cr_list) {
list_del(&cr->cr_list);
spin_unlock(&sess->cr_i_lock);
spin_lock(&cr->conn_recovery_cmd_lock);
list_for_each_entry_safe(cmd, cmd_tmp,
&cr->conn_recovery_cmd_list, i_conn_node) {
list_del(&cmd->i_conn_node);
cmd->conn = NULL;
spin_unlock(&cr->conn_recovery_cmd_lock);
iscsit_free_cmd(cmd);
spin_lock(&cr->conn_recovery_cmd_lock);
}
spin_unlock(&cr->conn_recovery_cmd_lock);
spin_lock(&sess->cr_i_lock);
kfree(cr);
}
spin_unlock(&sess->cr_i_lock);
}
int iscsit_remove_active_connection_recovery_entry(
struct iscsi_conn_recovery *cr,
struct iscsi_session *sess)
{
spin_lock(&sess->cr_a_lock);
list_del(&cr->cr_list);
sess->conn_recovery_count--;
pr_debug("Decremented connection recovery count to %u for"
" SID: %u\n", sess->conn_recovery_count, sess->sid);
spin_unlock(&sess->cr_a_lock);
kfree(cr);
return 0;
}
static void iscsit_remove_inactive_connection_recovery_entry(
struct iscsi_conn_recovery *cr,
struct iscsi_session *sess)
{
spin_lock(&sess->cr_i_lock);
list_del(&cr->cr_list);
spin_unlock(&sess->cr_i_lock);
}
/*
* Called with cr->conn_recovery_cmd_lock help.
*/
int iscsit_remove_cmd_from_connection_recovery(
struct iscsi_cmd *cmd,
struct iscsi_session *sess)
{
struct iscsi_conn_recovery *cr;
if (!cmd->cr) {
pr_err("struct iscsi_conn_recovery pointer for ITT: 0x%08x"
" is NULL!\n", cmd->init_task_tag);
BUG();
}
cr = cmd->cr;
list_del(&cmd->i_conn_node);
return --cr->cmd_count;
}
void iscsit_discard_cr_cmds_by_expstatsn(
struct iscsi_conn_recovery *cr,
u32 exp_statsn)
{
u32 dropped_count = 0;
struct iscsi_cmd *cmd, *cmd_tmp;
struct iscsi_session *sess = cr->sess;
spin_lock(&cr->conn_recovery_cmd_lock);
list_for_each_entry_safe(cmd, cmd_tmp,
&cr->conn_recovery_cmd_list, i_conn_node) {
if (((cmd->deferred_i_state != ISTATE_SENT_STATUS) &&
(cmd->deferred_i_state != ISTATE_REMOVE)) ||
(cmd->stat_sn >= exp_statsn)) {
continue;
}
dropped_count++;
pr_debug("Dropping Acknowledged ITT: 0x%08x, StatSN:"
" 0x%08x, CID: %hu.\n", cmd->init_task_tag,
cmd->stat_sn, cr->cid);
iscsit_remove_cmd_from_connection_recovery(cmd, sess);
spin_unlock(&cr->conn_recovery_cmd_lock);
iscsit_free_cmd(cmd);
spin_lock(&cr->conn_recovery_cmd_lock);
}
spin_unlock(&cr->conn_recovery_cmd_lock);
pr_debug("Dropped %u total acknowledged commands on"
" CID: %hu less than old ExpStatSN: 0x%08x\n",
dropped_count, cr->cid, exp_statsn);
if (!cr->cmd_count) {
pr_debug("No commands to be reassigned for failed"
" connection CID: %hu on SID: %u\n",
cr->cid, sess->sid);
iscsit_remove_inactive_connection_recovery_entry(cr, sess);
iscsit_attach_active_connection_recovery_entry(sess, cr);
pr_debug("iSCSI connection recovery successful for CID:"
" %hu on SID: %u\n", cr->cid, sess->sid);
iscsit_remove_active_connection_recovery_entry(cr, sess);
} else {
iscsit_remove_inactive_connection_recovery_entry(cr, sess);
iscsit_attach_active_connection_recovery_entry(sess, cr);
}
}
int iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(struct iscsi_conn *conn)
{
u32 dropped_count = 0;
struct iscsi_c
|