67441b68fa
All three callers of transport_generic_handle_data are from user context and can use target_execute_cmd directly to handle the backend I/O submission of WRITE I/O. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
845 lines
23 KiB
C
845 lines
23 KiB
C
/*******************************************************************************
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* This file contains the iSCSI Target specific Task Management functions.
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*
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* \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
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*
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* Licensed to the Linux Foundation under the General Public License (GPL) version 2.
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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 <asm/unaligned.h>
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#include <scsi/scsi_device.h>
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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 "iscsi_target_core.h"
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#include "iscsi_target_seq_pdu_list.h"
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#include "iscsi_target_datain_values.h"
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#include "iscsi_target_device.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_tmr.h"
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#include "iscsi_target_tpg.h"
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#include "iscsi_target_util.h"
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#include "iscsi_target.h"
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u8 iscsit_tmr_abort_task(
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struct iscsi_cmd *cmd,
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unsigned char *buf)
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{
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struct iscsi_cmd *ref_cmd;
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struct iscsi_conn *conn = cmd->conn;
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struct iscsi_tmr_req *tmr_req = cmd->tmr_req;
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struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
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struct iscsi_tm *hdr = (struct iscsi_tm *) buf;
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ref_cmd = iscsit_find_cmd_from_itt(conn, hdr->rtt);
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if (!ref_cmd) {
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pr_err("Unable to locate RefTaskTag: 0x%08x on CID:"
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" %hu.\n", hdr->rtt, conn->cid);
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return ((hdr->refcmdsn >= conn->sess->exp_cmd_sn) &&
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(hdr->refcmdsn <= conn->sess->max_cmd_sn)) ?
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ISCSI_TMF_RSP_COMPLETE : ISCSI_TMF_RSP_NO_TASK;
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}
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if (ref_cmd->cmd_sn != hdr->refcmdsn) {
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pr_err("RefCmdSN 0x%08x does not equal"
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" task's CmdSN 0x%08x. Rejecting ABORT_TASK.\n",
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hdr->refcmdsn, ref_cmd->cmd_sn);
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return ISCSI_TMF_RSP_REJECTED;
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}
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se_tmr->ref_task_tag = hdr->rtt;
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tmr_req->ref_cmd = ref_cmd;
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tmr_req->ref_cmd_sn = hdr->refcmdsn;
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tmr_req->exp_data_sn = hdr->exp_datasn;
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return ISCSI_TMF_RSP_COMPLETE;
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}
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/*
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* Called from iscsit_handle_task_mgt_cmd().
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*/
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int iscsit_tmr_task_warm_reset(
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struct iscsi_conn *conn,
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struct iscsi_tmr_req *tmr_req,
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unsigned char *buf)
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{
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struct iscsi_session *sess = conn->sess;
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struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
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if (!na->tmr_warm_reset) {
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pr_err("TMR Opcode TARGET_WARM_RESET authorization"
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" failed for Initiator Node: %s\n",
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sess->se_sess->se_node_acl->initiatorname);
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return -1;
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}
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/*
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* Do the real work in transport_generic_do_tmr().
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*/
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return 0;
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}
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int iscsit_tmr_task_cold_reset(
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struct iscsi_conn *conn,
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struct iscsi_tmr_req *tmr_req,
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unsigned char *buf)
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{
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struct iscsi_session *sess = conn->sess;
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struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
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if (!na->tmr_cold_reset) {
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pr_err("TMR Opcode TARGET_COLD_RESET authorization"
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" failed for Initiator Node: %s\n",
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sess->se_sess->se_node_acl->initiatorname);
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return -1;
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}
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/*
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* Do the real work in transport_generic_do_tmr().
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*/
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return 0;
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}
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u8 iscsit_tmr_task_reassign(
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struct iscsi_cmd *cmd,
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unsigned char *buf)
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{
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struct iscsi_cmd *ref_cmd = NULL;
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struct iscsi_conn *conn = cmd->conn;
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struct iscsi_conn_recovery *cr = NULL;
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struct iscsi_tmr_req *tmr_req = cmd->tmr_req;
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struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
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struct iscsi_tm *hdr = (struct iscsi_tm *) buf;
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int ret, ref_lun;
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pr_debug("Got TASK_REASSIGN TMR ITT: 0x%08x,"
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" RefTaskTag: 0x%08x, ExpDataSN: 0x%08x, CID: %hu\n",
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hdr->itt, hdr->rtt, hdr->exp_datasn, conn->cid);
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if (conn->sess->sess_ops->ErrorRecoveryLevel != 2) {
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pr_err("TMR TASK_REASSIGN not supported in ERL<2,"
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" ignoring request.\n");
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return ISCSI_TMF_RSP_NOT_SUPPORTED;
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}
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ret = iscsit_find_cmd_for_recovery(conn->sess, &ref_cmd, &cr, hdr->rtt);
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if (ret == -2) {
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pr_err("Command ITT: 0x%08x is still alligent to CID:"
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" %hu\n", ref_cmd->init_task_tag, cr->cid);
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return ISCSI_TMF_RSP_TASK_ALLEGIANT;
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} else if (ret == -1) {
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pr_err("Unable to locate RefTaskTag: 0x%08x in"
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" connection recovery command list.\n", hdr->rtt);
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return ISCSI_TMF_RSP_NO_TASK;
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}
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/*
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* Temporary check to prevent connection recovery for
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* connections with a differing MaxRecvDataSegmentLength.
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*/
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if (cr->maxrecvdatasegmentlength !=
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conn->conn_ops->MaxRecvDataSegmentLength) {
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pr_err("Unable to perform connection recovery for"
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" differing MaxRecvDataSegmentLength, rejecting"
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" TMR TASK_REASSIGN.\n");
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return ISCSI_TMF_RSP_REJECTED;
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}
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ref_lun = scsilun_to_int(&hdr->lun);
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if (ref_lun != ref_cmd->se_cmd.orig_fe_lun) {
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pr_err("Unable to perform connection recovery for"
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" differing ref_lun: %d ref_cmd orig_fe_lun: %u\n",
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ref_lun, ref_cmd->se_cmd.orig_fe_lun);
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return ISCSI_TMF_RSP_REJECTED;
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}
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se_tmr->ref_task_tag = hdr->rtt;
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tmr_req->ref_cmd = ref_cmd;
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tmr_req->ref_cmd_sn = hdr->refcmdsn;
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tmr_req->exp_data_sn = hdr->exp_datasn;
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tmr_req->conn_recovery = cr;
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tmr_req->task_reassign = 1;
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/*
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* Command can now be reassigned to a new connection.
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* The task management response must be sent before the
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* reassignment actually happens. See iscsi_tmr_post_handler().
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*/
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return ISCSI_TMF_RSP_COMPLETE;
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}
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static void iscsit_task_reassign_remove_cmd(
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struct iscsi_cmd *cmd,
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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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int ret;
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spin_lock(&cr->conn_recovery_cmd_lock);
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ret = iscsit_remove_cmd_from_connection_recovery(cmd, sess);
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spin_unlock(&cr->conn_recovery_cmd_lock);
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if (!ret) {
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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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}
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}
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static int iscsit_task_reassign_complete_nop_out(
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struct iscsi_tmr_req *tmr_req,
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struct iscsi_conn *conn)
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{
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struct iscsi_cmd *cmd = tmr_req->ref_cmd;
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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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return -1;
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}
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cr = cmd->cr;
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/*
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* Reset the StatSN so a new one for this commands new connection
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* will be assigned.
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* Reset the ExpStatSN as well so we may receive Status SNACKs.
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*/
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cmd->stat_sn = cmd->exp_stat_sn = 0;
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iscsit_task_reassign_remove_cmd(cmd, cr, conn->sess);
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spin_lock_bh(&conn->cmd_lock);
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list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
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spin_unlock_bh(&conn->cmd_lock);
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cmd->i_state = ISTATE_SEND_NOPIN;
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iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
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return 0;
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}
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static int iscsit_task_reassign_complete_write(
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struct iscsi_cmd *cmd,
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struct iscsi_tmr_req *tmr_req)
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{
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int no_build_r2ts = 0;
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u32 length = 0, offset = 0;
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struct iscsi_conn *conn = cmd->conn;
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struct se_cmd *se_cmd = &cmd->se_cmd;
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/*
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* The Initiator must not send a R2T SNACK with a Begrun less than
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* the TMR TASK_REASSIGN's ExpDataSN.
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*/
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if (!tmr_req->exp_data_sn) {
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cmd->cmd_flags &= ~ICF_GOT_DATACK_SNACK;
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cmd->acked_data_sn = 0;
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} else {
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cmd->cmd_flags |= ICF_GOT_DATACK_SNACK;
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cmd->acked_data_sn = (tmr_req->exp_data_sn - 1);
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}
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/*
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* The TMR TASK_REASSIGN's ExpDataSN contains the next R2TSN the
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* Initiator is expecting. The Target controls all WRITE operations
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* so if we have received all DataOUT we can safety ignore Initiator.
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*/
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if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
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if (!(cmd->se_cmd.transport_state & CMD_T_SENT)) {
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pr_debug("WRITE ITT: 0x%08x: t_state: %d"
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" never sent to transport\n",
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cmd->init_task_tag, cmd->se_cmd.t_state);
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target_execute_cmd(se_cmd);
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return 0;
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}
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cmd->i_state = ISTATE_SEND_STATUS;
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iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
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return 0;
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}
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/*
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* Special case to deal with DataSequenceInOrder=No and Non-Immeidate
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* Unsolicited DataOut.
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*/
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if (cmd->unsolicited_data) {
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cmd->unsolicited_data = 0;
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offset = cmd->next_burst_len = cmd->write_data_done;
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if ((conn->sess->sess_ops->FirstBurstLength - offset) >=
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cmd->se_cmd.data_length) {
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no_build_r2ts = 1;
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length = (cmd->se_cmd.data_length - offset);
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} else
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length = (conn->sess->sess_ops->FirstBurstLength - offset);
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spin_lock_bh(&cmd->r2t_lock);
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if (iscsit_add_r2t_to_list(cmd, offset, length, 0, 0) < 0) {
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spin_unlock_bh(&cmd->r2t_lock);
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return -1;
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}
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cmd->outstanding_r2ts++;
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spin_unlock_bh(&cmd->r2t_lock);
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if (no_build_r2ts)
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return 0;
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}
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/*
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* iscsit_build_r2ts_for_cmd() can handle the rest from here.
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*/
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return iscsit_build_r2ts_for_cmd(cmd, conn, true);
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}
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static int iscsit_task_reassign_complete_read(
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struct iscsi_cmd *cmd,
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struct iscsi_tmr_req *tmr_req)
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{
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struct iscsi_conn *conn = cmd->conn;
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struct iscsi_datain_req *dr;
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struct se_cmd *se_cmd = &cmd->se_cmd;
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/*
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* The Initiator must not send a Data SNACK with a BegRun less than
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* the TMR TASK_REASSIGN's ExpDataSN.
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*/
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if (!tmr_req->exp_data_sn) {
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cmd->cmd_flags &= ~ICF_GOT_DATACK_SNACK;
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cmd->acked_data_sn = 0;
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} else {
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cmd->cmd_flags |= ICF_GOT_DATACK_SNACK;
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cmd->acked_data_sn = (tmr_req->exp_data_sn - 1);
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}
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if (!(cmd->se_cmd.transport_state & CMD_T_SENT)) {
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pr_debug("READ ITT: 0x%08x: t_state: %d never sent to"
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" transport\n", cmd->init_task_tag,
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cmd->se_cmd.t_state);
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transport_handle_cdb_direct(se_cmd);
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return 0;
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}
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if (!(se_cmd->transport_state & CMD_T_COMPLETE)) {
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pr_err("READ ITT: 0x%08x: t_state: %d, never returned"
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" from transport\n", cmd->init_task_tag,
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cmd->se_cmd.t_state);
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return -1;
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}
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dr = iscsit_allocate_datain_req();
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if (!dr)
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return -1;
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/*
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* The TMR TASK_REASSIGN's ExpDataSN contains the next DataSN the
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* Initiator is expecting.
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*/
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dr->data_sn = dr->begrun = tmr_req->exp_data_sn;
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dr->runlength = 0;
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dr->generate_recovery_values = 1;
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dr->recovery = DATAIN_CONNECTION_RECOVERY;
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iscsit_attach_datain_req(cmd, dr);
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cmd->i_state = ISTATE_SEND_DATAIN;
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iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
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return 0;
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}
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static int iscsit_task_reassign_complete_none(
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struct iscsi_cmd *cmd,
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struct iscsi_tmr_req *tmr_req)
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{
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struct iscsi_conn *conn = cmd->conn;
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cmd->i_state = ISTATE_SEND_STATUS;
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iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
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return 0;
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}
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static int iscsit_task_reassign_complete_scsi_cmnd(
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struct iscsi_tmr_req *tmr_req,
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struct iscsi_conn *conn)
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{
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struct iscsi_cmd *cmd = tmr_req->ref_cmd;
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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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return -1;
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}
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cr = cmd->cr;
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/*
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* Reset the StatSN so a new one for this commands new connection
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* will be assigned.
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* Reset the ExpStatSN as well so we may receive Status SNACKs.
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*/
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cmd->stat_sn = cmd->exp_stat_sn = 0;
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iscsit_task_reassign_remove_cmd(cmd, cr, conn->sess);
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spin_lock_bh(&conn->cmd_lock);
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list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
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spin_unlock_bh(&conn->cmd_lock);
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if (cmd->se_cmd.se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
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cmd->i_state = ISTATE_SEND_STATUS;
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iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
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return 0;
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}
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switch (cmd->data_direction) {
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case DMA_TO_DEVICE:
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return iscsit_task_reassign_complete_write(cmd, tmr_req);
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case DMA_FROM_DEVICE:
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return iscsit_task_reassign_complete_read(cmd, tmr_req);
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case DMA_NONE:
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return iscsit_task_reassign_complete_none(cmd, tmr_req);
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default:
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pr_err("Unknown cmd->data_direction: 0x%02x\n",
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cmd->data_direction);
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return -1;
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}
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return 0;
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}
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static int iscsit_task_reassign_complete(
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struct iscsi_tmr_req *tmr_req,
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struct iscsi_conn *conn)
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{
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struct iscsi_cmd *cmd;
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int ret = 0;
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if (!tmr_req->ref_cmd) {
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pr_err("TMR Request is missing a RefCmd struct iscsi_cmd.\n");
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return -1;
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}
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cmd = tmr_req->ref_cmd;
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cmd->conn = conn;
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switch (cmd->iscsi_opcode) {
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case ISCSI_OP_NOOP_OUT:
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ret = iscsit_task_reassign_complete_nop_out(tmr_req, conn);
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break;
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case ISCSI_OP_SCSI_CMD:
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ret = iscsit_task_reassign_complete_scsi_cmnd(tmr_req, conn);
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break;
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default:
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pr_err("Illegal iSCSI Opcode 0x%02x during"
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" command realligence\n", cmd->iscsi_opcode);
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return -1;
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}
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if (ret != 0)
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return ret;
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pr_debug("Completed connection realligence for Opcode: 0x%02x,"
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" ITT: 0x%08x to CID: %hu.\n", cmd->iscsi_opcode,
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cmd->init_task_tag, conn->cid);
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return 0;
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}
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/*
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* Handles special after-the-fact actions related to TMRs.
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|
* Right now the only one that its really needed for is
|
|
* connection recovery releated TASK_REASSIGN.
|
|
*/
|
|
extern int iscsit_tmr_post_handler(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_tmr_req *tmr_req = cmd->tmr_req;
|
|
struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
|
|
|
|
if (tmr_req->task_reassign &&
|
|
(se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
|
|
return iscsit_task_reassign_complete(tmr_req, conn);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Nothing to do here, but leave it for good measure. :-)
|
|
*/
|
|
int iscsit_task_reassign_prepare_read(
|
|
struct iscsi_tmr_req *tmr_req,
|
|
struct iscsi_conn *conn)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void iscsit_task_reassign_prepare_unsolicited_dataout(
|
|
struct iscsi_cmd *cmd,
|
|
struct iscsi_conn *conn)
|
|
{
|
|
int i, j;
|
|
struct iscsi_pdu *pdu = NULL;
|
|
struct iscsi_seq *seq = NULL;
|
|
|
|
if (conn->sess->sess_ops->DataSequenceInOrder) {
|
|
cmd->data_sn = 0;
|
|
|
|
if (cmd->immediate_data)
|
|
cmd->r2t_offset += (cmd->first_burst_len -
|
|
cmd->seq_start_offset);
|
|
|
|
if (conn->sess->sess_ops->DataPDUInOrder) {
|
|
cmd->write_data_done -= (cmd->immediate_data) ?
|
|
(cmd->first_burst_len -
|
|
cmd->seq_start_offset) :
|
|
cmd->first_burst_len;
|
|
cmd->first_burst_len = 0;
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < cmd->pdu_count; i++) {
|
|
pdu = &cmd->pdu_list[i];
|
|
|
|
if (pdu->status != ISCSI_PDU_RECEIVED_OK)
|
|
continue;
|
|
|
|
if ((pdu->offset >= cmd->seq_start_offset) &&
|
|
((pdu->offset + pdu->length) <=
|
|
cmd->seq_end_offset)) {
|
|
cmd->first_burst_len -= pdu->length;
|
|
cmd->write_data_done -= pdu->length;
|
|
pdu->status = ISCSI_PDU_NOT_RECEIVED;
|
|
}
|
|
}
|
|
} else {
|
|
for (i = 0; i < cmd->seq_count; i++) {
|
|
seq = &cmd->seq_list[i];
|
|
|
|
if (seq->type != SEQTYPE_UNSOLICITED)
|
|
continue;
|
|
|
|
cmd->write_data_done -=
|
|
(seq->offset - seq->orig_offset);
|
|
cmd->first_burst_len = 0;
|
|
seq->data_sn = 0;
|
|
seq->offset = seq->orig_offset;
|
|
seq->next_burst_len = 0;
|
|
seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY;
|
|
|
|
if (conn->sess->sess_ops->DataPDUInOrder)
|
|
continue;
|
|
|
|
for (j = 0; j < seq->pdu_count; j++) {
|
|
pdu = &cmd->pdu_list[j+seq->pdu_start];
|
|
|
|
if (pdu->status != ISCSI_PDU_RECEIVED_OK)
|
|
continue;
|
|
|
|
pdu->status = ISCSI_PDU_NOT_RECEIVED;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
int iscsit_task_reassign_prepare_write(
|
|
struct iscsi_tmr_req *tmr_req,
|
|
struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_cmd *cmd = tmr_req->ref_cmd;
|
|
struct iscsi_pdu *pdu = NULL;
|
|
struct iscsi_r2t *r2t = NULL, *r2t_tmp;
|
|
int first_incomplete_r2t = 1, i = 0;
|
|
|
|
/*
|
|
* The command was in the process of receiving Unsolicited DataOUT when
|
|
* the connection failed.
|
|
*/
|
|
if (cmd->unsolicited_data)
|
|
iscsit_task_reassign_prepare_unsolicited_dataout(cmd, conn);
|
|
|
|
/*
|
|
* The Initiator is requesting R2Ts starting from zero, skip
|
|
* checking acknowledged R2Ts and start checking struct iscsi_r2ts
|
|
* greater than zero.
|
|
*/
|
|
if (!tmr_req->exp_data_sn)
|
|
goto drop_unacknowledged_r2ts;
|
|
|
|
/*
|
|
* We now check that the PDUs in DataOUT sequences below
|
|
* the TMR TASK_REASSIGN ExpDataSN (R2TSN the Initiator is
|
|
* expecting next) have all the DataOUT they require to complete
|
|
* the DataOUT sequence. First scan from R2TSN 0 to TMR
|
|
* TASK_REASSIGN ExpDataSN-1.
|
|
*
|
|
* If we have not received all DataOUT in question, we must
|
|
* make sure to make the appropriate changes to values in
|
|
* struct iscsi_cmd (and elsewhere depending on session parameters)
|
|
* so iscsit_build_r2ts_for_cmd() in iscsit_task_reassign_complete_write()
|
|
* will resend a new R2T for the DataOUT sequences in question.
|
|
*/
|
|
spin_lock_bh(&cmd->r2t_lock);
|
|
if (list_empty(&cmd->cmd_r2t_list)) {
|
|
spin_unlock_bh(&cmd->r2t_lock);
|
|
return -1;
|
|
}
|
|
|
|
list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
|
|
|
|
if (r2t->r2t_sn >= tmr_req->exp_data_sn)
|
|
continue;
|
|
/*
|
|
* Safely ignore Recovery R2Ts and R2Ts that have completed
|
|
* DataOUT sequences.
|
|
*/
|
|
if (r2t->seq_complete)
|
|
continue;
|
|
|
|
if (r2t->recovery_r2t)
|
|
continue;
|
|
|
|
/*
|
|
* DataSequenceInOrder=Yes:
|
|
*
|
|
* Taking into account the iSCSI implementation requirement of
|
|
* MaxOutstandingR2T=1 while ErrorRecoveryLevel>0 and
|
|
* DataSequenceInOrder=Yes, we must take into consideration
|
|
* the following:
|
|
*
|
|
* DataSequenceInOrder=No:
|
|
*
|
|
* Taking into account that the Initiator controls the (possibly
|
|
* random) PDU Order in (possibly random) Sequence Order of
|
|
* DataOUT the target requests with R2Ts, we must take into
|
|
* consideration the following:
|
|
*
|
|
* DataPDUInOrder=Yes for DataSequenceInOrder=[Yes,No]:
|
|
*
|
|
* While processing non-complete R2T DataOUT sequence requests
|
|
* the Target will re-request only the total sequence length
|
|
* minus current received offset. This is because we must
|
|
* assume the initiator will continue sending DataOUT from the
|
|
* last PDU before the connection failed.
|
|
*
|
|
* DataPDUInOrder=No for DataSequenceInOrder=[Yes,No]:
|
|
*
|
|
* While processing non-complete R2T DataOUT sequence requests
|
|
* the Target will re-request the entire DataOUT sequence if
|
|
* any single PDU is missing from the sequence. This is because
|
|
* we have no logical method to determine the next PDU offset,
|
|
* and we must assume the Initiator will be sending any random
|
|
* PDU offset in the current sequence after TASK_REASSIGN
|
|
* has completed.
|
|
*/
|
|
if (conn->sess->sess_ops->DataSequenceInOrder) {
|
|
if (!first_incomplete_r2t) {
|
|
cmd->r2t_offset -= r2t->xfer_len;
|
|
goto next;
|
|
}
|
|
|
|
if (conn->sess->sess_ops->DataPDUInOrder) {
|
|
cmd->data_sn = 0;
|
|
cmd->r2t_offset -= (r2t->xfer_len -
|
|
cmd->next_burst_len);
|
|
first_incomplete_r2t = 0;
|
|
goto next;
|
|
}
|
|
|
|
cmd->data_sn = 0;
|
|
cmd->r2t_offset -= r2t->xfer_len;
|
|
|
|
for (i = 0; i < cmd->pdu_count; i++) {
|
|
pdu = &cmd->pdu_list[i];
|
|
|
|
if (pdu->status != ISCSI_PDU_RECEIVED_OK)
|
|
continue;
|
|
|
|
if ((pdu->offset >= r2t->offset) &&
|
|
(pdu->offset < (r2t->offset +
|
|
r2t->xfer_len))) {
|
|
cmd->next_burst_len -= pdu->length;
|
|
cmd->write_data_done -= pdu->length;
|
|
pdu->status = ISCSI_PDU_NOT_RECEIVED;
|
|
}
|
|
}
|
|
|
|
first_incomplete_r2t = 0;
|
|
} else {
|
|
struct iscsi_seq *seq;
|
|
|
|
seq = iscsit_get_seq_holder(cmd, r2t->offset,
|
|
r2t->xfer_len);
|
|
if (!seq) {
|
|
spin_unlock_bh(&cmd->r2t_lock);
|
|
return -1;
|
|
}
|
|
|
|
cmd->write_data_done -=
|
|
(seq->offset - seq->orig_offset);
|
|
seq->data_sn = 0;
|
|
seq->offset = seq->orig_offset;
|
|
seq->next_burst_len = 0;
|
|
seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY;
|
|
|
|
cmd->seq_send_order--;
|
|
|
|
if (conn->sess->sess_ops->DataPDUInOrder)
|
|
goto next;
|
|
|
|
for (i = 0; i < seq->pdu_count; i++) {
|
|
pdu = &cmd->pdu_list[i+seq->pdu_start];
|
|
|
|
if (pdu->status != ISCSI_PDU_RECEIVED_OK)
|
|
continue;
|
|
|
|
pdu->status = ISCSI_PDU_NOT_RECEIVED;
|
|
}
|
|
}
|
|
|
|
next:
|
|
cmd->outstanding_r2ts--;
|
|
}
|
|
spin_unlock_bh(&cmd->r2t_lock);
|
|
|
|
/*
|
|
* We now drop all unacknowledged R2Ts, ie: ExpDataSN from TMR
|
|
* TASK_REASSIGN to the last R2T in the list.. We are also careful
|
|
* to check that the Initiator is not requesting R2Ts for DataOUT
|
|
* sequences it has already completed.
|
|
*
|
|
* Free each R2T in question and adjust values in struct iscsi_cmd
|
|
* accordingly so iscsit_build_r2ts_for_cmd() do the rest of
|
|
* the work after the TMR TASK_REASSIGN Response is sent.
|
|
*/
|
|
drop_unacknowledged_r2ts:
|
|
|
|
cmd->cmd_flags &= ~ICF_SENT_LAST_R2T;
|
|
cmd->r2t_sn = tmr_req->exp_data_sn;
|
|
|
|
spin_lock_bh(&cmd->r2t_lock);
|
|
list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list) {
|
|
/*
|
|
* Skip up to the R2T Sequence number provided by the
|
|
* iSCSI TASK_REASSIGN TMR
|
|
*/
|
|
if (r2t->r2t_sn < tmr_req->exp_data_sn)
|
|
continue;
|
|
|
|
if (r2t->seq_complete) {
|
|
pr_err("Initiator is requesting R2Ts from"
|
|
" R2TSN: 0x%08x, but R2TSN: 0x%08x, Offset: %u,"
|
|
" Length: %u is already complete."
|
|
" BAD INITIATOR ERL=2 IMPLEMENTATION!\n",
|
|
tmr_req->exp_data_sn, r2t->r2t_sn,
|
|
r2t->offset, r2t->xfer_len);
|
|
spin_unlock_bh(&cmd->r2t_lock);
|
|
return -1;
|
|
}
|
|
|
|
if (r2t->recovery_r2t) {
|
|
iscsit_free_r2t(r2t, cmd);
|
|
continue;
|
|
}
|
|
|
|
/* DataSequenceInOrder=Yes:
|
|
*
|
|
* Taking into account the iSCSI implementation requirement of
|
|
* MaxOutstandingR2T=1 while ErrorRecoveryLevel>0 and
|
|
* DataSequenceInOrder=Yes, it's safe to subtract the R2Ts
|
|
* entire transfer length from the commands R2T offset marker.
|
|
*
|
|
* DataSequenceInOrder=No:
|
|
*
|
|
* We subtract the difference from struct iscsi_seq between the
|
|
* current offset and original offset from cmd->write_data_done
|
|
* for account for DataOUT PDUs already received. Then reset
|
|
* the current offset to the original and zero out the current
|
|
* burst length, to make sure we re-request the entire DataOUT
|
|
* sequence.
|
|
*/
|
|
if (conn->sess->sess_ops->DataSequenceInOrder)
|
|
cmd->r2t_offset -= r2t->xfer_len;
|
|
else
|
|
cmd->seq_send_order--;
|
|
|
|
cmd->outstanding_r2ts--;
|
|
iscsit_free_r2t(r2t, cmd);
|
|
}
|
|
spin_unlock_bh(&cmd->r2t_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Performs sanity checks TMR TASK_REASSIGN's ExpDataSN for
|
|
* a given struct iscsi_cmd.
|
|
*/
|
|
int iscsit_check_task_reassign_expdatasn(
|
|
struct iscsi_tmr_req *tmr_req,
|
|
struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_cmd *ref_cmd = tmr_req->ref_cmd;
|
|
|
|
if (ref_cmd->iscsi_opcode != ISCSI_OP_SCSI_CMD)
|
|
return 0;
|
|
|
|
if (ref_cmd->se_cmd.se_cmd_flags & SCF_SENT_CHECK_CONDITION)
|
|
return 0;
|
|
|
|
if (ref_cmd->data_direction == DMA_NONE)
|
|
return 0;
|
|
|
|
/*
|
|
* For READs the TMR TASK_REASSIGNs ExpDataSN contains the next DataSN
|
|
* of DataIN the Initiator is expecting.
|
|
*
|
|
* Also check that the Initiator is not re-requesting DataIN that has
|
|
* already been acknowledged with a DataAck SNACK.
|
|
*/
|
|
if (ref_cmd->data_direction == DMA_FROM_DEVICE) {
|
|
if (tmr_req->exp_data_sn > ref_cmd->data_sn) {
|
|
pr_err("Received ExpDataSN: 0x%08x for READ"
|
|
" in TMR TASK_REASSIGN greater than command's"
|
|
" DataSN: 0x%08x.\n", tmr_req->exp_data_sn,
|
|
ref_cmd->data_sn);
|
|
return -1;
|
|
}
|
|
if ((ref_cmd->cmd_flags & ICF_GOT_DATACK_SNACK) &&
|
|
(tmr_req->exp_data_sn <= ref_cmd->acked_data_sn)) {
|
|
pr_err("Received ExpDataSN: 0x%08x for READ"
|
|
" in TMR TASK_REASSIGN for previously"
|
|
" acknowledged DataIN: 0x%08x,"
|
|
" protocol error\n", tmr_req->exp_data_sn,
|
|
ref_cmd->acked_data_sn);
|
|
return -1;
|
|
}
|
|
return iscsit_task_reassign_prepare_read(tmr_req, conn);
|
|
}
|
|
|
|
/*
|
|
* For WRITEs the TMR TASK_REASSIGNs ExpDataSN contains the next R2TSN
|
|
* for R2Ts the Initiator is expecting.
|
|
*
|
|
* Do the magic in iscsit_task_reassign_prepare_write().
|
|
*/
|
|
if (ref_cmd->data_direction == DMA_TO_DEVICE) {
|
|
if (tmr_req->exp_data_sn > ref_cmd->r2t_sn) {
|
|
pr_err("Received ExpDataSN: 0x%08x for WRITE"
|
|
" in TMR TASK_REASSIGN greater than command's"
|
|
" R2TSN: 0x%08x.\n", tmr_req->exp_data_sn,
|
|
ref_cmd->r2t_sn);
|
|
return -1;
|
|
}
|
|
return iscsit_task_reassign_prepare_write(tmr_req, conn);
|
|
}
|
|
|
|
pr_err("Unknown iSCSI data_direction: 0x%02x\n",
|
|
ref_cmd->data_direction);
|
|
|
|
return -1;
|
|
}
|