528 lines
14 KiB
C
528 lines
14 KiB
C
/*******************************************************************************
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* This file contains the iSCSI Target DataIN value generation functions.
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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 <linux/slab.h>
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#include <scsi/iscsi_proto.h>
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#include <target/iscsi/iscsi_target_core.h>
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#include "iscsi_target_seq_pdu_list.h"
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#include "iscsi_target_erl1.h"
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#include "iscsi_target_util.h"
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#include "iscsi_target.h"
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#include "iscsi_target_datain_values.h"
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struct iscsi_datain_req *iscsit_allocate_datain_req(void)
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{
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struct iscsi_datain_req *dr;
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dr = kmem_cache_zalloc(lio_dr_cache, GFP_ATOMIC);
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if (!dr) {
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pr_err("Unable to allocate memory for"
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" struct iscsi_datain_req\n");
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return NULL;
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}
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INIT_LIST_HEAD(&dr->cmd_datain_node);
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return dr;
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}
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void iscsit_attach_datain_req(struct iscsi_cmd *cmd, struct iscsi_datain_req *dr)
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{
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spin_lock(&cmd->datain_lock);
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list_add_tail(&dr->cmd_datain_node, &cmd->datain_list);
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spin_unlock(&cmd->datain_lock);
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}
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void iscsit_free_datain_req(struct iscsi_cmd *cmd, struct iscsi_datain_req *dr)
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{
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spin_lock(&cmd->datain_lock);
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list_del(&dr->cmd_datain_node);
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spin_unlock(&cmd->datain_lock);
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kmem_cache_free(lio_dr_cache, dr);
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}
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void iscsit_free_all_datain_reqs(struct iscsi_cmd *cmd)
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{
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struct iscsi_datain_req *dr, *dr_tmp;
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spin_lock(&cmd->datain_lock);
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list_for_each_entry_safe(dr, dr_tmp, &cmd->datain_list, cmd_datain_node) {
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list_del(&dr->cmd_datain_node);
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kmem_cache_free(lio_dr_cache, dr);
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}
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spin_unlock(&cmd->datain_lock);
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}
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struct iscsi_datain_req *iscsit_get_datain_req(struct iscsi_cmd *cmd)
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{
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if (list_empty(&cmd->datain_list)) {
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pr_err("cmd->datain_list is empty for ITT:"
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" 0x%08x\n", cmd->init_task_tag);
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return NULL;
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}
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return list_first_entry(&cmd->datain_list, struct iscsi_datain_req,
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cmd_datain_node);
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}
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/*
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* For Normal and Recovery DataSequenceInOrder=Yes and DataPDUInOrder=Yes.
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*/
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static struct iscsi_datain_req *iscsit_set_datain_values_yes_and_yes(
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struct iscsi_cmd *cmd,
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struct iscsi_datain *datain)
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{
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u32 next_burst_len, read_data_done, read_data_left;
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struct iscsi_conn *conn = cmd->conn;
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struct iscsi_datain_req *dr;
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dr = iscsit_get_datain_req(cmd);
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if (!dr)
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return NULL;
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if (dr->recovery && dr->generate_recovery_values) {
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if (iscsit_create_recovery_datain_values_datasequenceinorder_yes(
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cmd, dr) < 0)
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return NULL;
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dr->generate_recovery_values = 0;
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}
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next_burst_len = (!dr->recovery) ?
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cmd->next_burst_len : dr->next_burst_len;
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read_data_done = (!dr->recovery) ?
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cmd->read_data_done : dr->read_data_done;
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read_data_left = (cmd->se_cmd.data_length - read_data_done);
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if (!read_data_left) {
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pr_err("ITT: 0x%08x read_data_left is zero!\n",
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cmd->init_task_tag);
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return NULL;
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}
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if ((read_data_left <= conn->conn_ops->MaxRecvDataSegmentLength) &&
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(read_data_left <= (conn->sess->sess_ops->MaxBurstLength -
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next_burst_len))) {
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datain->length = read_data_left;
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datain->flags |= (ISCSI_FLAG_CMD_FINAL | ISCSI_FLAG_DATA_STATUS);
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if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
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datain->flags |= ISCSI_FLAG_DATA_ACK;
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} else {
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if ((next_burst_len +
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conn->conn_ops->MaxRecvDataSegmentLength) <
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conn->sess->sess_ops->MaxBurstLength) {
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datain->length =
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conn->conn_ops->MaxRecvDataSegmentLength;
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next_burst_len += datain->length;
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} else {
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datain->length = (conn->sess->sess_ops->MaxBurstLength -
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next_burst_len);
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next_burst_len = 0;
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datain->flags |= ISCSI_FLAG_CMD_FINAL;
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if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
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datain->flags |= ISCSI_FLAG_DATA_ACK;
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}
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}
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datain->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++;
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datain->offset = read_data_done;
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if (!dr->recovery) {
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cmd->next_burst_len = next_burst_len;
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cmd->read_data_done += datain->length;
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} else {
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dr->next_burst_len = next_burst_len;
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dr->read_data_done += datain->length;
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}
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if (!dr->recovery) {
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if (datain->flags & ISCSI_FLAG_DATA_STATUS)
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dr->dr_complete = DATAIN_COMPLETE_NORMAL;
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return dr;
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}
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if (!dr->runlength) {
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if (datain->flags & ISCSI_FLAG_DATA_STATUS) {
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dr->dr_complete =
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(dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
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DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
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DATAIN_COMPLETE_CONNECTION_RECOVERY;
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}
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} else {
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if ((dr->begrun + dr->runlength) == dr->data_sn) {
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dr->dr_complete =
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(dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
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DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
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DATAIN_COMPLETE_CONNECTION_RECOVERY;
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}
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}
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return dr;
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}
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/*
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* For Normal and Recovery DataSequenceInOrder=No and DataPDUInOrder=Yes.
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*/
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static struct iscsi_datain_req *iscsit_set_datain_values_no_and_yes(
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struct iscsi_cmd *cmd,
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struct iscsi_datain *datain)
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{
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u32 offset, read_data_done, read_data_left, seq_send_order;
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struct iscsi_conn *conn = cmd->conn;
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struct iscsi_datain_req *dr;
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struct iscsi_seq *seq;
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dr = iscsit_get_datain_req(cmd);
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if (!dr)
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return NULL;
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if (dr->recovery && dr->generate_recovery_values) {
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if (iscsit_create_recovery_datain_values_datasequenceinorder_no(
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cmd, dr) < 0)
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return NULL;
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dr->generate_recovery_values = 0;
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}
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read_data_done = (!dr->recovery) ?
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cmd->read_data_done : dr->read_data_done;
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seq_send_order = (!dr->recovery) ?
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cmd->seq_send_order : dr->seq_send_order;
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read_data_left = (cmd->se_cmd.data_length - read_data_done);
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if (!read_data_left) {
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pr_err("ITT: 0x%08x read_data_left is zero!\n",
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cmd->init_task_tag);
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return NULL;
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}
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seq = iscsit_get_seq_holder_for_datain(cmd, seq_send_order);
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if (!seq)
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return NULL;
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seq->sent = 1;
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if (!dr->recovery && !seq->next_burst_len)
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seq->first_datasn = cmd->data_sn;
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offset = (seq->offset + seq->next_burst_len);
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if ((offset + conn->conn_ops->MaxRecvDataSegmentLength) >=
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cmd->se_cmd.data_length) {
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datain->length = (cmd->se_cmd.data_length - offset);
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datain->offset = offset;
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datain->flags |= ISCSI_FLAG_CMD_FINAL;
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if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
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datain->flags |= ISCSI_FLAG_DATA_ACK;
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seq->next_burst_len = 0;
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seq_send_order++;
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} else {
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if ((seq->next_burst_len +
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conn->conn_ops->MaxRecvDataSegmentLength) <
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conn->sess->sess_ops->MaxBurstLength) {
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datain->length =
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conn->conn_ops->MaxRecvDataSegmentLength;
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datain->offset = (seq->offset + seq->next_burst_len);
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seq->next_burst_len += datain->length;
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} else {
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datain->length = (conn->sess->sess_ops->MaxBurstLength -
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seq->next_burst_len);
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datain->offset = (seq->offset + seq->next_burst_len);
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datain->flags |= ISCSI_FLAG_CMD_FINAL;
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if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
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datain->flags |= ISCSI_FLAG_DATA_ACK;
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seq->next_burst_len = 0;
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seq_send_order++;
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}
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}
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if ((read_data_done + datain->length) == cmd->se_cmd.data_length)
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datain->flags |= ISCSI_FLAG_DATA_STATUS;
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datain->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++;
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if (!dr->recovery) {
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cmd->seq_send_order = seq_send_order;
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cmd->read_data_done += datain->length;
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} else {
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dr->seq_send_order = seq_send_order;
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dr->read_data_done += datain->length;
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}
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if (!dr->recovery) {
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if (datain->flags & ISCSI_FLAG_CMD_FINAL)
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seq->last_datasn = datain->data_sn;
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if (datain->flags & ISCSI_FLAG_DATA_STATUS)
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dr->dr_complete = DATAIN_COMPLETE_NORMAL;
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return dr;
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}
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if (!dr->runlength) {
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if (datain->flags & ISCSI_FLAG_DATA_STATUS) {
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dr->dr_complete =
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(dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
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DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
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DATAIN_COMPLETE_CONNECTION_RECOVERY;
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}
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} else {
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if ((dr->begrun + dr->runlength) == dr->data_sn) {
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dr->dr_complete =
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(dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
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DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
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DATAIN_COMPLETE_CONNECTION_RECOVERY;
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}
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}
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return dr;
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}
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/*
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* For Normal and Recovery DataSequenceInOrder=Yes and DataPDUInOrder=No.
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*/
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static struct iscsi_datain_req *iscsit_set_datain_values_yes_and_no(
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struct iscsi_cmd *cmd,
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struct iscsi_datain *datain)
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{
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u32 next_burst_len, read_data_done, read_data_left;
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struct iscsi_conn *conn = cmd->conn;
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struct iscsi_datain_req *dr;
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struct iscsi_pdu *pdu;
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dr = iscsit_get_datain_req(cmd);
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if (!dr)
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return NULL;
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if (dr->recovery && dr->generate_recovery_values) {
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if (iscsit_create_recovery_datain_values_datasequenceinorder_yes(
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cmd, dr) < 0)
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return NULL;
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dr->generate_recovery_values = 0;
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}
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next_burst_len = (!dr->recovery) ?
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cmd->next_burst_len : dr->next_burst_len;
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read_data_done = (!dr->recovery) ?
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cmd->read_data_done : dr->read_data_done;
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read_data_left = (cmd->se_cmd.data_length - read_data_done);
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if (!read_data_left) {
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pr_err("ITT: 0x%08x read_data_left is zero!\n",
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cmd->init_task_tag);
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return dr;
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}
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pdu = iscsit_get_pdu_holder_for_seq(cmd, NULL);
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if (!pdu)
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return dr;
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if ((read_data_done + pdu->length) == cmd->se_cmd.data_length) {
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pdu->flags |= (ISCSI_FLAG_CMD_FINAL | ISCSI_FLAG_DATA_STATUS);
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if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
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pdu->flags |= ISCSI_FLAG_DATA_ACK;
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next_burst_len = 0;
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} else {
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if ((next_burst_len + conn->conn_ops->MaxRecvDataSegmentLength) <
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conn->sess->sess_ops->MaxBurstLength)
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next_burst_len += pdu->length;
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else {
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pdu->flags |= ISCSI_FLAG_CMD_FINAL;
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if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
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pdu->flags |= ISCSI_FLAG_DATA_ACK;
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next_burst_len = 0;
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}
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}
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pdu->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++;
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if (!dr->recovery) {
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cmd->next_burst_len = next_burst_len;
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cmd->read_data_done += pdu->length;
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} else {
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dr->next_burst_len = next_burst_len;
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dr->read_data_done += pdu->length;
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}
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datain->flags = pdu->flags;
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datain->length = pdu->length;
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datain->offset = pdu->offset;
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datain->data_sn = pdu->data_sn;
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if (!dr->recovery) {
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if (datain->flags & ISCSI_FLAG_DATA_STATUS)
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dr->dr_complete = DATAIN_COMPLETE_NORMAL;
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return dr;
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}
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if (!dr->runlength) {
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if (datain->flags & ISCSI_FLAG_DATA_STATUS) {
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dr->dr_complete =
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(dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
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DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
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DATAIN_COMPLETE_CONNECTION_RECOVERY;
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}
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} else {
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if ((dr->begrun + dr->runlength) == dr->data_sn) {
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dr->dr_complete =
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(dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
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DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
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DATAIN_COMPLETE_CONNECTION_RECOVERY;
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}
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}
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return dr;
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}
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/*
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* For Normal and Recovery DataSequenceInOrder=No and DataPDUInOrder=No.
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*/
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static struct iscsi_datain_req *iscsit_set_datain_values_no_and_no(
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struct iscsi_cmd *cmd,
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struct iscsi_datain *datain)
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{
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u32 read_data_done, read_data_left, seq_send_order;
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struct iscsi_conn *conn = cmd->conn;
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struct iscsi_datain_req *dr;
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struct iscsi_pdu *pdu;
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struct iscsi_seq *seq = NULL;
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dr = iscsit_get_datain_req(cmd);
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if (!dr)
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return NULL;
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if (dr->recovery && dr->generate_recovery_values) {
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if (iscsit_create_recovery_datain_values_datasequenceinorder_no(
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cmd, dr) < 0)
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return NULL;
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dr->generate_recovery_values = 0;
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}
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read_data_done = (!dr->recovery) ?
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cmd->read_data_done : dr->read_data_done;
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seq_send_order = (!dr->recovery) ?
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cmd->seq_send_order : dr->seq_send_order;
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read_data_left = (cmd->se_cmd.data_length - read_data_done);
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if (!read_data_left) {
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pr_err("ITT: 0x%08x read_data_left is zero!\n",
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cmd->init_task_tag);
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return NULL;
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}
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seq = iscsit_get_seq_holder_for_datain(cmd, seq_send_order);
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if (!seq)
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return NULL;
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seq->sent = 1;
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if (!dr->recovery && !seq->next_burst_len)
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seq->first_datasn = cmd->data_sn;
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pdu = iscsit_get_pdu_holder_for_seq(cmd, seq);
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if (!pdu)
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return NULL;
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if (seq->pdu_send_order == seq->pdu_count) {
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pdu->flags |= ISCSI_FLAG_CMD_FINAL;
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if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
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pdu->flags |= ISCSI_FLAG_DATA_ACK;
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seq->next_burst_len = 0;
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seq_send_order++;
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} else
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seq->next_burst_len += pdu->length;
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if ((read_data_done + pdu->length) == cmd->se_cmd.data_length)
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pdu->flags |= ISCSI_FLAG_DATA_STATUS;
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pdu->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++;
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if (!dr->recovery) {
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cmd->seq_send_order = seq_send_order;
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cmd->read_data_done += pdu->length;
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} else {
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dr->seq_send_order = seq_send_order;
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dr->read_data_done += pdu->length;
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}
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datain->flags = pdu->flags;
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datain->length = pdu->length;
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datain->offset = pdu->offset;
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datain->data_sn = pdu->data_sn;
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if (!dr->recovery) {
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if (datain->flags & ISCSI_FLAG_CMD_FINAL)
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|
seq->last_datasn = datain->data_sn;
|
|
if (datain->flags & ISCSI_FLAG_DATA_STATUS)
|
|
dr->dr_complete = DATAIN_COMPLETE_NORMAL;
|
|
|
|
return dr;
|
|
}
|
|
|
|
if (!dr->runlength) {
|
|
if (datain->flags & ISCSI_FLAG_DATA_STATUS) {
|
|
dr->dr_complete =
|
|
(dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
|
|
DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
|
|
DATAIN_COMPLETE_CONNECTION_RECOVERY;
|
|
}
|
|
} else {
|
|
if ((dr->begrun + dr->runlength) == dr->data_sn) {
|
|
dr->dr_complete =
|
|
(dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
|
|
DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
|
|
DATAIN_COMPLETE_CONNECTION_RECOVERY;
|
|
}
|
|
}
|
|
|
|
return dr;
|
|
}
|
|
|
|
struct iscsi_datain_req *iscsit_get_datain_values(
|
|
struct iscsi_cmd *cmd,
|
|
struct iscsi_datain *datain)
|
|
{
|
|
struct iscsi_conn *conn = cmd->conn;
|
|
|
|
if (conn->sess->sess_ops->DataSequenceInOrder &&
|
|
conn->sess->sess_ops->DataPDUInOrder)
|
|
return iscsit_set_datain_values_yes_and_yes(cmd, datain);
|
|
else if (!conn->sess->sess_ops->DataSequenceInOrder &&
|
|
conn->sess->sess_ops->DataPDUInOrder)
|
|
return iscsit_set_datain_values_no_and_yes(cmd, datain);
|
|
else if (conn->sess->sess_ops->DataSequenceInOrder &&
|
|
!conn->sess->sess_ops->DataPDUInOrder)
|
|
return iscsit_set_datain_values_yes_and_no(cmd, datain);
|
|
else if (!conn->sess->sess_ops->DataSequenceInOrder &&
|
|
!conn->sess->sess_ops->DataPDUInOrder)
|
|
return iscsit_set_datain_values_no_and_no(cmd, datain);
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(iscsit_get_datain_values);
|