437 lines
12 KiB
C
437 lines
12 KiB
C
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/*******************************************************************************
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* This file contains error recovery level two functions used by
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* the iSCSI Target driver.
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*
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* (c) Copyright 2007-2013 Datera, Inc.
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*
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* Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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******************************************************************************/
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#include <scsi/iscsi_proto.h>
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#include <target/target_core_base.h>
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#include <target/target_core_fabric.h>
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#include <target/iscsi/iscsi_target_core.h>
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#include "iscsi_target_datain_values.h"
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#include "iscsi_target_util.h"
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#include "iscsi_target_erl0.h"
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#include "iscsi_target_erl1.h"
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#include "iscsi_target_erl2.h"
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#include "iscsi_target.h"
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/*
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* FIXME: Does RData SNACK apply here as well?
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*/
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void iscsit_create_conn_recovery_datain_values(
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struct iscsi_cmd *cmd,
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__be32 exp_data_sn)
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{
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u32 data_sn = 0;
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struct iscsi_conn *conn = cmd->conn;
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cmd->next_burst_len = 0;
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cmd->read_data_done = 0;
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while (be32_to_cpu(exp_data_sn) > data_sn) {
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if ((cmd->next_burst_len +
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conn->conn_ops->MaxRecvDataSegmentLength) <
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conn->sess->sess_ops->MaxBurstLength) {
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cmd->read_data_done +=
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conn->conn_ops->MaxRecvDataSegmentLength;
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cmd->next_burst_len +=
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conn->conn_ops->MaxRecvDataSegmentLength;
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} else {
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cmd->read_data_done +=
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(conn->sess->sess_ops->MaxBurstLength -
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cmd->next_burst_len);
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cmd->next_burst_len = 0;
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}
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data_sn++;
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}
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}
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void iscsit_create_conn_recovery_dataout_values(
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struct iscsi_cmd *cmd)
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{
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u32 write_data_done = 0;
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struct iscsi_conn *conn = cmd->conn;
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cmd->data_sn = 0;
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cmd->next_burst_len = 0;
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while (cmd->write_data_done > write_data_done) {
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if ((write_data_done + conn->sess->sess_ops->MaxBurstLength) <=
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cmd->write_data_done)
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write_data_done += conn->sess->sess_ops->MaxBurstLength;
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else
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break;
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}
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cmd->write_data_done = write_data_done;
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}
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static int iscsit_attach_active_connection_recovery_entry(
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struct iscsi_session *sess,
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struct iscsi_conn_recovery *cr)
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{
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spin_lock(&sess->cr_a_lock);
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list_add_tail(&cr->cr_list, &sess->cr_active_list);
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spin_unlock(&sess->cr_a_lock);
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return 0;
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}
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static int iscsit_attach_inactive_connection_recovery_entry(
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struct iscsi_session *sess,
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struct iscsi_conn_recovery *cr)
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{
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spin_lock(&sess->cr_i_lock);
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list_add_tail(&cr->cr_list, &sess->cr_inactive_list);
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sess->conn_recovery_count++;
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pr_debug("Incremented connection recovery count to %u for"
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" SID: %u\n", sess->conn_recovery_count, sess->sid);
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spin_unlock(&sess->cr_i_lock);
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return 0;
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}
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struct iscsi_conn_recovery *iscsit_get_inactive_connection_recovery_entry(
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struct iscsi_session *sess,
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u16 cid)
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{
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struct iscsi_conn_recovery *cr;
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spin_lock(&sess->cr_i_lock);
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list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
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if (cr->cid == cid) {
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spin_unlock(&sess->cr_i_lock);
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return cr;
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}
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}
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spin_unlock(&sess->cr_i_lock);
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return NULL;
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}
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void iscsit_free_connection_recovery_entires(struct iscsi_session *sess)
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{
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struct iscsi_cmd *cmd, *cmd_tmp;
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struct iscsi_conn_recovery *cr, *cr_tmp;
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spin_lock(&sess->cr_a_lock);
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list_for_each_entry_safe(cr, cr_tmp, &sess->cr_active_list, cr_list) {
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list_del(&cr->cr_list);
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spin_unlock(&sess->cr_a_lock);
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spin_lock(&cr->conn_recovery_cmd_lock);
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list_for_each_entry_safe(cmd, cmd_tmp,
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&cr->conn_recovery_cmd_list, i_conn_node) {
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list_del_init(&cmd->i_conn_node);
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cmd->conn = NULL;
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spin_unlock(&cr->conn_recovery_cmd_lock);
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iscsit_free_cmd(cmd, true);
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spin_lock(&cr->conn_recovery_cmd_lock);
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}
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spin_unlock(&cr->conn_recovery_cmd_lock);
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spin_lock(&sess->cr_a_lock);
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kfree(cr);
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}
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spin_unlock(&sess->cr_a_lock);
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spin_lock(&sess->cr_i_lock);
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list_for_each_entry_safe(cr, cr_tmp, &sess->cr_inactive_list, cr_list) {
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list_del(&cr->cr_list);
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spin_unlock(&sess->cr_i_lock);
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spin_lock(&cr->conn_recovery_cmd_lock);
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list_for_each_entry_safe(cmd, cmd_tmp,
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&cr->conn_recovery_cmd_list, i_conn_node) {
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list_del_init(&cmd->i_conn_node);
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cmd->conn = NULL;
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spin_unlock(&cr->conn_recovery_cmd_lock);
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iscsit_free_cmd(cmd, true);
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spin_lock(&cr->conn_recovery_cmd_lock);
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}
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spin_unlock(&cr->conn_recovery_cmd_lock);
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spin_lock(&sess->cr_i_lock);
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kfree(cr);
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}
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spin_unlock(&sess->cr_i_lock);
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}
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int iscsit_remove_active_connection_recovery_entry(
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struct iscsi_conn_recovery *cr,
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struct iscsi_session *sess)
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{
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spin_lock(&sess->cr_a_lock);
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list_del(&cr->cr_list);
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sess->conn_recovery_count--;
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pr_debug("Decremented connection recovery count to %u for"
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" SID: %u\n", sess->conn_recovery_count, sess->sid);
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spin_unlock(&sess->cr_a_lock);
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kfree(cr);
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return 0;
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}
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static void iscsit_remove_inactive_connection_recovery_entry(
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struct iscsi_conn_recovery *cr,
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struct iscsi_session *sess)
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{
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spin_lock(&sess->cr_i_lock);
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list_del(&cr->cr_list);
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spin_unlock(&sess->cr_i_lock);
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}
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/*
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* Called with cr->conn_recovery_cmd_lock help.
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*/
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int iscsit_remove_cmd_from_connection_recovery(
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struct iscsi_cmd *cmd,
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struct iscsi_session *sess)
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{
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struct iscsi_conn_recovery *cr;
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if (!cmd->cr) {
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pr_err("struct iscsi_conn_recovery pointer for ITT: 0x%08x"
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" is NULL!\n", cmd->init_task_tag);
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BUG();
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}
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cr = cmd->cr;
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list_del_init(&cmd->i_conn_node);
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return --cr->cmd_count;
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}
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void iscsit_discard_cr_cmds_by_expstatsn(
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struct iscsi_conn_recovery *cr,
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u32 exp_statsn)
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{
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u32 dropped_count = 0;
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struct iscsi_cmd *cmd, *cmd_tmp;
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struct iscsi_session *sess = cr->sess;
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spin_lock(&cr->conn_recovery_cmd_lock);
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list_for_each_entry_safe(cmd, cmd_tmp,
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&cr->conn_recovery_cmd_list, i_conn_node) {
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if (((cmd->deferred_i_state != ISTATE_SENT_STATUS) &&
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(cmd->deferred_i_state != ISTATE_REMOVE)) ||
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(cmd->stat_sn >= exp_statsn)) {
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continue;
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}
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dropped_count++;
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pr_debug("Dropping Acknowledged ITT: 0x%08x, StatSN:"
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" 0x%08x, CID: %hu.\n", cmd->init_task_tag,
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cmd->stat_sn, cr->cid);
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iscsit_remove_cmd_from_connection_recovery(cmd, sess);
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spin_unlock(&cr->conn_recovery_cmd_lock);
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iscsit_free_cmd(cmd, true);
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spin_lock(&cr->conn_recovery_cmd_lock);
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}
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spin_unlock(&cr->conn_recovery_cmd_lock);
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pr_debug("Dropped %u total acknowledged commands on"
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" CID: %hu less than old ExpStatSN: 0x%08x\n",
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dropped_count, cr->cid, exp_statsn);
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if (!cr->cmd_count) {
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pr_debug("No commands to be reassigned for failed"
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" connection CID: %hu on SID: %u\n",
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cr->cid, sess->sid);
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iscsit_remove_inactive_connection_recovery_entry(cr, sess);
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iscsit_attach_active_connection_recovery_entry(sess, cr);
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pr_debug("iSCSI connection recovery successful for CID:"
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" %hu on SID: %u\n", cr->cid, sess->sid);
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iscsit_remove_active_connection_recovery_entry(cr, sess);
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} else {
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iscsit_remove_inactive_connection_recovery_entry(cr, sess);
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iscsit_attach_active_connection_recovery_entry(sess, cr);
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}
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}
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int iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(struct iscsi_conn *conn)
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{
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u32 dropped_count = 0;
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struct iscsi_cmd *cmd, *cmd_tmp;
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struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp;
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struct iscsi_session *sess = conn->sess;
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mutex_lock(&sess->cmdsn_mutex);
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list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp,
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&sess->sess_ooo_cmdsn_list, ooo_list) {
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if (ooo_cmdsn->cid != conn->cid)
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continue;
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dropped_count++;
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pr_debug("Dropping unacknowledged CmdSN:"
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" 0x%08x during connection recovery on CID: %hu\n",
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ooo_cmdsn->cmdsn, conn->cid);
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iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn);
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}
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mutex_unlock(&sess->cmdsn_mutex);
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spin_lock_bh(&conn->cmd_lock);
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list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
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if (!(cmd->cmd_flags & ICF_OOO_CMDSN))
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continue;
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list_del_init(&cmd->i_conn_node);
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spin_unlock_bh(&conn->cmd_lock);
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iscsit_free_cmd(cmd, true);
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spin_lock_bh(&conn->cmd_lock);
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}
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spin_unlock_bh(&conn->cmd_lock);
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pr_debug("Dropped %u total unacknowledged commands on CID:"
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" %hu for ExpCmdSN: 0x%08x.\n", dropped_count, conn->cid,
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sess->exp_cmd_sn);
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return 0;
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}
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int iscsit_prepare_cmds_for_realligance(struct iscsi_conn *conn)
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{
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u32 cmd_count = 0;
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struct iscsi_cmd *cmd, *cmd_tmp;
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struct iscsi_conn_recovery *cr;
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/*
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* Allocate an struct iscsi_conn_recovery for this connection.
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* Each struct iscsi_cmd contains an struct iscsi_conn_recovery pointer
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* (struct iscsi_cmd->cr) so we need to allocate this before preparing the
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* connection's command list for connection recovery.
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*/
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cr = kzalloc(sizeof(struct iscsi_conn_recovery), GFP_KERNEL);
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if (!cr) {
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pr_err("Unable to allocate memory for"
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" struct iscsi_conn_recovery.\n");
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return -1;
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}
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INIT_LIST_HEAD(&cr->cr_list);
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INIT_LIST_HEAD(&cr->conn_recovery_cmd_list);
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spin_lock_init(&cr->conn_recovery_cmd_lock);
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/*
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* Only perform connection recovery on ISCSI_OP_SCSI_CMD or
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* ISCSI_OP_NOOP_OUT opcodes. For all other opcodes call
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* list_del_init(&cmd->i_conn_node); to release the command to the
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* session pool and remove it from the connection's list.
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*
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* Also stop the DataOUT timer, which will be restarted after
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* sending the TMR response.
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*/
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spin_lock_bh(&conn->cmd_lock);
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list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
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if ((cmd->iscsi_opcode != ISCSI_OP_SCSI_CMD) &&
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(cmd->iscsi_opcode != ISCSI_OP_NOOP_OUT)) {
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pr_debug("Not performing realligence on"
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" Opcode: 0x%02x, ITT: 0x%08x, CmdSN: 0x%08x,"
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||
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|
" CID: %hu\n", cmd->iscsi_opcode,
|
||
|
|
cmd->init_task_tag, cmd->cmd_sn, conn->cid);
|
||
|
|
|
||
|
|
list_del_init(&cmd->i_conn_node);
|
||
|
|
spin_unlock_bh(&conn->cmd_lock);
|
||
|
|
iscsit_free_cmd(cmd, true);
|
||
|
|
spin_lock_bh(&conn->cmd_lock);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Special case where commands greater than or equal to
|
||
|
|
* the session's ExpCmdSN are attached to the connection
|
||
|
|
* list but not to the out of order CmdSN list. The one
|
||
|
|
* obvious case is when a command with immediate data
|
||
|
|
* attached must only check the CmdSN against ExpCmdSN
|
||
|
|
* after the data is received. The special case below
|
||
|
|
* is when the connection fails before data is received,
|
||
|
|
* but also may apply to other PDUs, so it has been
|
||
|
|
* made generic here.
|
||
|
|
*/
|
||
|
|
if (!(cmd->cmd_flags & ICF_OOO_CMDSN) && !cmd->immediate_cmd &&
|
||
|
|
iscsi_sna_gte(cmd->cmd_sn, conn->sess->exp_cmd_sn)) {
|
||
|
|
list_del_init(&cmd->i_conn_node);
|
||
|
|
spin_unlock_bh(&conn->cmd_lock);
|
||
|
|
iscsit_free_cmd(cmd, true);
|
||
|
|
spin_lock_bh(&conn->cmd_lock);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
cmd_count++;
|
||
|
|
pr_debug("Preparing Opcode: 0x%02x, ITT: 0x%08x,"
|
||
|
|
" CmdSN: 0x%08x, StatSN: 0x%08x, CID: %hu for"
|
||
|
|
" realligence.\n", cmd->iscsi_opcode,
|
||
|
|
cmd->init_task_tag, cmd->cmd_sn, cmd->stat_sn,
|
||
|
|
conn->cid);
|
||
|
|
|
||
|
|
cmd->deferred_i_state = cmd->i_state;
|
||
|
|
cmd->i_state = ISTATE_IN_CONNECTION_RECOVERY;
|
||
|
|
|
||
|
|
if (cmd->data_direction == DMA_TO_DEVICE)
|
||
|
|
iscsit_stop_dataout_timer(cmd);
|
||
|
|
|
||
|
|
cmd->sess = conn->sess;
|
||
|
|
|
||
|
|
list_del_init(&cmd->i_conn_node);
|
||
|
|
spin_unlock_bh(&conn->cmd_lock);
|
||
|
|
|
||
|
|
iscsit_free_all_datain_reqs(cmd);
|
||
|
|
|
||
|
|
transport_wait_for_tasks(&cmd->se_cmd);
|
||
|
|
/*
|
||
|
|
* Add the struct iscsi_cmd to the connection recovery cmd list
|
||
|
|
*/
|
||
|
|
spin_lock(&cr->conn_recovery_cmd_lock);
|
||
|
|
list_add_tail(&cmd->i_conn_node, &cr->conn_recovery_cmd_list);
|
||
|
|
spin_unlock(&cr->conn_recovery_cmd_lock);
|
||
|
|
|
||
|
|
spin_lock_bh(&conn->cmd_lock);
|
||
|
|
cmd->cr = cr;
|
||
|
|
cmd->conn = NULL;
|
||
|
|
}
|
||
|
|
spin_unlock_bh(&conn->cmd_lock);
|
||
|
|
/*
|
||
|
|
* Fill in the various values in the preallocated struct iscsi_conn_recovery.
|
||
|
|
*/
|
||
|
|
cr->cid = conn->cid;
|
||
|
|
cr->cmd_count = cmd_count;
|
||
|
|
cr->maxrecvdatasegmentlength = conn->conn_ops->MaxRecvDataSegmentLength;
|
||
|
|
cr->maxxmitdatasegmentlength = conn->conn_ops->MaxXmitDataSegmentLength;
|
||
|
|
cr->sess = conn->sess;
|
||
|
|
|
||
|
|
iscsit_attach_inactive_connection_recovery_entry(conn->sess, cr);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int iscsit_connection_recovery_transport_reset(struct iscsi_conn *conn)
|
||
|
|
{
|
||
|
|
atomic_set(&conn->connection_recovery, 1);
|
||
|
|
|
||
|
|
if (iscsit_close_connection(conn) < 0)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|