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- /******************************************************************************
- * This file contains error recovery level zero functions used by
- * the iSCSI Target driver.
- *
- * (c) Copyright 2007-2013 Datera, Inc.
- *
- * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- ******************************************************************************/
- #include <scsi/iscsi_proto.h>
- #include <target/target_core_base.h>
- #include <target/target_core_fabric.h>
- #include <target/iscsi/iscsi_target_core.h>
- #include "iscsi_target_seq_pdu_list.h"
- #include "iscsi_target_erl0.h"
- #include "iscsi_target_erl1.h"
- #include "iscsi_target_erl2.h"
- #include "iscsi_target_util.h"
- #include "iscsi_target.h"
- /*
- * Used to set values in struct iscsi_cmd that iscsit_dataout_check_sequence()
- * checks against to determine a PDU's Offset+Length is within the current
- * DataOUT Sequence. Used for DataSequenceInOrder=Yes only.
- */
- void iscsit_set_dataout_sequence_values(
- struct iscsi_cmd *cmd)
- {
- struct iscsi_conn *conn = cmd->conn;
- /*
- * Still set seq_start_offset and seq_end_offset for Unsolicited
- * DataOUT, even if DataSequenceInOrder=No.
- */
- if (cmd->unsolicited_data) {
- cmd->seq_start_offset = cmd->write_data_done;
- cmd->seq_end_offset = min(cmd->se_cmd.data_length,
- conn->sess->sess_ops->FirstBurstLength);
- return;
- }
- if (!conn->sess->sess_ops->DataSequenceInOrder)
- return;
- if (!cmd->seq_start_offset && !cmd->seq_end_offset) {
- cmd->seq_start_offset = cmd->write_data_done;
- cmd->seq_end_offset = (cmd->se_cmd.data_length >
- conn->sess->sess_ops->MaxBurstLength) ?
- (cmd->write_data_done +
- conn->sess->sess_ops->MaxBurstLength) : cmd->se_cmd.data_length;
- } else {
- cmd->seq_start_offset = cmd->seq_end_offset;
- cmd->seq_end_offset = ((cmd->seq_end_offset +
- conn->sess->sess_ops->MaxBurstLength) >=
- cmd->se_cmd.data_length) ? cmd->se_cmd.data_length :
- (cmd->seq_end_offset +
- conn->sess->sess_ops->MaxBurstLength);
- }
- }
- static int iscsit_dataout_within_command_recovery_check(
- struct iscsi_cmd *cmd,
- unsigned char *buf)
- {
- struct iscsi_conn *conn = cmd->conn;
- struct iscsi_data *hdr = (struct iscsi_data *) buf;
- u32 payload_length = ntoh24(hdr->dlength);
- /*
- * We do the within-command recovery checks here as it is
- * the first function called in iscsi_check_pre_dataout().
- * Basically, if we are in within-command recovery and
- * the PDU does not contain the offset the sequence needs,
- * dump the payload.
- *
- * This only applies to DataPDUInOrder=Yes, for
- * DataPDUInOrder=No we only re-request the failed PDU
- * and check that all PDUs in a sequence are received
- * upon end of sequence.
- */
- if (conn->sess->sess_ops->DataSequenceInOrder) {
- if ((cmd->cmd_flags & ICF_WITHIN_COMMAND_RECOVERY) &&
- cmd->write_data_done != be32_to_cpu(hdr->offset))
- goto dump;
- cmd->cmd_flags &= ~ICF_WITHIN_COMMAND_RECOVERY;
- } else {
- struct iscsi_seq *seq;
- seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset),
- payload_length);
- if (!seq)
- return DATAOUT_CANNOT_RECOVER;
- /*
- * Set the struct iscsi_seq pointer to reuse later.
- */
- cmd->seq_ptr = seq;
- if (conn->sess->sess_ops->DataPDUInOrder) {
- if (seq->status ==
- DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY &&
- (seq->offset != be32_to_cpu(hdr->offset) ||
- seq->data_sn != be32_to_cpu(hdr->datasn)))
- goto dump;
- } else {
- if (seq->status ==
- DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY &&
- seq->data_sn != be32_to_cpu(hdr->datasn))
- goto dump;
- }
- if (seq->status == DATAOUT_SEQUENCE_COMPLETE)
- goto dump;
- if (seq->status != DATAOUT_SEQUENCE_COMPLETE)
- seq->status = 0;
- }
- return DATAOUT_NORMAL;
- dump:
- pr_err("Dumping DataOUT PDU Offset: %u Length: %d DataSN:"
- " 0x%08x\n", hdr->offset, payload_length, hdr->datasn);
- return iscsit_dump_data_payload(conn, payload_length, 1);
- }
- static int iscsit_dataout_check_unsolicited_sequence(
- struct iscsi_cmd *cmd,
- unsigned char *buf)
- {
- u32 first_burst_len;
- struct iscsi_conn *conn = cmd->conn;
- struct iscsi_data *hdr = (struct iscsi_data *) buf;
- u32 payload_length = ntoh24(hdr->dlength);
- if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) ||
- ((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) {
- pr_err("Command ITT: 0x%08x with Offset: %u,"
- " Length: %u outside of Unsolicited Sequence %u:%u while"
- " DataSequenceInOrder=Yes.\n", cmd->init_task_tag,
- be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset,
- cmd->seq_end_offset);
- return DATAOUT_CANNOT_RECOVER;
- }
- first_burst_len = (cmd->first_burst_len + payload_length);
- if (first_burst_len > conn->sess->sess_ops->FirstBurstLength) {
- pr_err("Total %u bytes exceeds FirstBurstLength: %u"
- " for this Unsolicited DataOut Burst.\n",
- first_burst_len, conn->sess->sess_ops->FirstBurstLength);
- transport_send_check_condition_and_sense(&cmd->se_cmd,
- TCM_INCORRECT_AMOUNT_OF_DATA, 0);
- return DATAOUT_CANNOT_RECOVER;
- }
- /*
- * Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity
- * checks for the current Unsolicited DataOUT Sequence.
- */
- if (hdr->flags & ISCSI_FLAG_CMD_FINAL) {
- /*
- * Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of
- * sequence checks are handled in
- * iscsit_dataout_datapduinorder_no_fbit().
- */
- if (!conn->sess->sess_ops->DataPDUInOrder)
- goto out;
- if ((first_burst_len != cmd->se_cmd.data_length) &&
- (first_burst_len != conn->sess->sess_ops->FirstBurstLength)) {
- pr_err("Unsolicited non-immediate data"
- " received %u does not equal FirstBurstLength: %u, and"
- " does not equal ExpXferLen %u.\n", first_burst_len,
- conn->sess->sess_ops->FirstBurstLength,
- cmd->se_cmd.data_length);
- transport_send_check_condition_and_sense(&cmd->se_cmd,
- TCM_INCORRECT_AMOUNT_OF_DATA, 0);
- return DATAOUT_CANNOT_RECOVER;
- }
- } else {
- if (first_burst_len == conn->sess->sess_ops->FirstBurstLength) {
- pr_err("Command ITT: 0x%08x reached"
- " FirstBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol"
- " error.\n", cmd->init_task_tag,
- conn->sess->sess_ops->FirstBurstLength);
- return DATAOUT_CANNOT_RECOVER;
- }
- if (first_burst_len == cmd->se_cmd.data_length) {
- pr_err("Command ITT: 0x%08x reached"
- " ExpXferLen: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol"
- " error.\n", cmd->init_task_tag, cmd->se_cmd.data_length);
- return DATAOUT_CANNOT_RECOVER;
- }
- }
- out:
- return DATAOUT_NORMAL;
- }
- static int iscsit_dataout_check_sequence(
- struct iscsi_cmd *cmd,
- unsigned char *buf)
- {
- u32 next_burst_len;
- struct iscsi_conn *conn = cmd->conn;
- struct iscsi_seq *seq = NULL;
- struct iscsi_data *hdr = (struct iscsi_data *) buf;
- u32 payload_length = ntoh24(hdr->dlength);
- /*
- * For DataSequenceInOrder=Yes: Check that the offset and offset+length
- * is within range as defined by iscsi_set_dataout_sequence_values().
- *
- * For DataSequenceInOrder=No: Check that an struct iscsi_seq exists for
- * offset+length tuple.
- */
- if (conn->sess->sess_ops->DataSequenceInOrder) {
- /*
- * Due to possibility of recovery DataOUT sent by the initiator
- * fullfilling an Recovery R2T, it's best to just dump the
- * payload here, instead of erroring out.
- */
- if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) ||
- ((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) {
- pr_err("Command ITT: 0x%08x with Offset: %u,"
- " Length: %u outside of Sequence %u:%u while"
- " DataSequenceInOrder=Yes.\n", cmd->init_task_tag,
- be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset,
- cmd->seq_end_offset);
- if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
- return DATAOUT_CANNOT_RECOVER;
- return DATAOUT_WITHIN_COMMAND_RECOVERY;
- }
- next_burst_len = (cmd->next_burst_len + payload_length);
- } else {
- seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset),
- payload_length);
- if (!seq)
- return DATAOUT_CANNOT_RECOVER;
- /*
- * Set the struct iscsi_seq pointer to reuse later.
- */
- cmd->seq_ptr = seq;
- if (seq->status == DATAOUT_SEQUENCE_COMPLETE) {
- if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
- return DATAOUT_CANNOT_RECOVER;
- return DATAOUT_WITHIN_COMMAND_RECOVERY;
- }
- next_burst_len = (seq->next_burst_len + payload_length);
- }
- if (next_burst_len > conn->sess->sess_ops->MaxBurstLength) {
- pr_err("Command ITT: 0x%08x, NextBurstLength: %u and"
- " Length: %u exceeds MaxBurstLength: %u. protocol"
- " error.\n", cmd->init_task_tag,
- (next_burst_len - payload_length),
- payload_length, conn->sess->sess_ops->MaxBurstLength);
- return DATAOUT_CANNOT_RECOVER;
- }
- /*
- * Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity
- * checks for the current DataOUT Sequence.
- */
- if (hdr->flags & ISCSI_FLAG_CMD_FINAL) {
- /*
- * Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of
- * sequence checks are handled in
- * iscsit_dataout_datapduinorder_no_fbit().
- */
- if (!conn->sess->sess_ops->DataPDUInOrder)
- goto out;
- if (conn->sess->sess_ops->DataSequenceInOrder) {
- if ((next_burst_len <
- conn->sess->sess_ops->MaxBurstLength) &&
- ((cmd->write_data_done + payload_length) <
- cmd->se_cmd.data_length)) {
- pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL"
- " before end of DataOUT sequence, protocol"
- " error.\n", cmd->init_task_tag);
- return DATAOUT_CANNOT_RECOVER;
- }
- } else {
- if (next_burst_len < seq->xfer_len) {
- pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL"
- " before end of DataOUT sequence, protocol"
- " error.\n", cmd->init_task_tag);
- return DATAOUT_CANNOT_RECOVER;
- }
- }
- } else {
- if (conn->sess->sess_ops->DataSequenceInOrder) {
- if (next_burst_len ==
- conn->sess->sess_ops->MaxBurstLength) {
- pr_err("Command ITT: 0x%08x reached"
- " MaxBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is"
- " not set, protocol error.", cmd->init_task_tag,
- conn->sess->sess_ops->MaxBurstLength);
- return DATAOUT_CANNOT_RECOVER;
- }
- if ((cmd->write_data_done + payload_length) ==
- cmd->se_cmd.data_length) {
- pr_err("Command ITT: 0x%08x reached"
- " last DataOUT PDU in sequence but ISCSI_FLAG_"
- "CMD_FINAL is not set, protocol error.\n",
- cmd->init_task_tag);
- return DATAOUT_CANNOT_RECOVER;
- }
- } else {
- if (next_burst_len == seq->xfer_len) {
- pr_err("Command ITT: 0x%08x reached"
- " last DataOUT PDU in sequence but ISCSI_FLAG_"
- "CMD_FINAL is not set, protocol error.\n",
- cmd->init_task_tag);
- return DATAOUT_CANNOT_RECOVER;
- }
- }
- }
- out:
- return DATAOUT_NORMAL;
- }
- static int iscsit_dataout_check_datasn(
- struct iscsi_cmd *cmd,
- unsigned char *buf)
- {
- u32 data_sn = 0;
- struct iscsi_conn *conn = cmd->conn;
- struct iscsi_data *hdr = (struct iscsi_data *) buf;
- u32 payload_length = ntoh24(hdr->dlength);
- /*
- * Considering the target has no method of re-requesting DataOUT
- * by DataSN, if we receieve a greater DataSN than expected we
- * assume the functions for DataPDUInOrder=[Yes,No] below will
- * handle it.
- *
- * If the DataSN is less than expected, dump the payload.
- */
- if (conn->sess->sess_ops->DataSequenceInOrder)
- data_sn = cmd->data_sn;
- else {
- struct iscsi_seq *seq = cmd->seq_ptr;
- data_sn = seq->data_sn;
- }
- if (be32_to_cpu(hdr->datasn) > data_sn) {
- pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x"
- " higher than expected 0x%08x.\n", cmd->init_task_tag,
- be32_to_cpu(hdr->datasn), data_sn);
- goto recover;
- } else if (be32_to_cpu(hdr->datasn) < data_sn) {
- pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x"
- " lower than expected 0x%08x, discarding payload.\n",
- cmd->init_task_tag, be32_to_cpu(hdr->datasn), data_sn);
- goto dump;
- }
- return DATAOUT_NORMAL;
- recover:
- if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
- pr_err("Unable to perform within-command recovery"
- " while ERL=0.\n");
- return DATAOUT_CANNOT_RECOVER;
- }
- dump:
- if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
- return DATAOUT_CANNOT_RECOVER;
- return DATAOUT_WITHIN_COMMAND_RECOVERY;
- }
- static int iscsit_dataout_pre_datapduinorder_yes(
- struct iscsi_cmd *cmd,
- unsigned char *buf)
- {
- int dump = 0, recovery = 0;
- struct iscsi_conn *conn = cmd->conn;
- struct iscsi_data *hdr = (struct iscsi_data *) buf;
- u32 payload_length = ntoh24(hdr->dlength);
- /*
- * For DataSequenceInOrder=Yes: If the offset is greater than the global
- * DataPDUInOrder=Yes offset counter in struct iscsi_cmd a protcol error has
- * occurred and fail the connection.
- *
- * For DataSequenceInOrder=No: If the offset is greater than the per
- * sequence DataPDUInOrder=Yes offset counter in struct iscsi_seq a protocol
- * error has occurred and fail the connection.
- */
- if (conn->sess->sess_ops->DataSequenceInOrder) {
- if (be32_to_cpu(hdr->offset) != cmd->write_data_done) {
- pr_err("Command ITT: 0x%08x, received offset"
- " %u different than expected %u.\n", cmd->init_task_tag,
- be32_to_cpu(hdr->offset), cmd->write_data_done);
- recovery = 1;
- goto recover;
- }
- } else {
- struct iscsi_seq *seq = cmd->seq_ptr;
- if (be32_to_cpu(hdr->offset) > seq->offset) {
- pr_err("Command ITT: 0x%08x, received offset"
- " %u greater than expected %u.\n", cmd->init_task_tag,
- be32_to_cpu(hdr->offset), seq->offset);
- recovery = 1;
- goto recover;
- } else if (be32_to_cpu(hdr->offset) < seq->offset) {
- pr_err("Command ITT: 0x%08x, received offset"
- " %u less than expected %u, discarding payload.\n",
- cmd->init_task_tag, be32_to_cpu(hdr->offset),
- seq->offset);
- dump = 1;
- goto dump;
- }
- }
- return DATAOUT_NORMAL;
- recover:
- if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
- pr_err("Unable to perform within-command recovery"
- " while ERL=0.\n");
- return DATAOUT_CANNOT_RECOVER;
- }
- dump:
- if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
- return DATAOUT_CANNOT_RECOVER;
- return (recovery) ? iscsit_recover_dataout_sequence(cmd,
- be32_to_cpu(hdr->offset), payload_length) :
- (dump) ? DATAOUT_WITHIN_COMMAND_RECOVERY : DATAOUT_NORMAL;
- }
- static int iscsit_dataout_pre_datapduinorder_no(
- struct iscsi_cmd *cmd,
- unsigned char *buf)
- {
- struct iscsi_pdu *pdu;
- struct iscsi_data *hdr = (struct iscsi_data *) buf;
- u32 payload_length = ntoh24(hdr->dlength);
- pdu = iscsit_get_pdu_holder(cmd, be32_to_cpu(hdr->offset),
- payload_length);
- if (!pdu)
- return DATAOUT_CANNOT_RECOVER;
- cmd->pdu_ptr = pdu;
- switch (pdu->status) {
- case ISCSI_PDU_NOT_RECEIVED:
- case ISCSI_PDU_CRC_FAILED:
- case ISCSI_PDU_TIMED_OUT:
- break;
- case ISCSI_PDU_RECEIVED_OK:
- pr_err("Command ITT: 0x%08x received already gotten"
- " Offset: %u, Length: %u\n", cmd->init_task_tag,
- be32_to_cpu(hdr->offset), payload_length);
- return iscsit_dump_data_payload(cmd->conn, payload_length, 1);
- default:
- return DATAOUT_CANNOT_RECOVER;
- }
- return DATAOUT_NORMAL;
- }
- static int iscsit_dataout_update_r2t(struct iscsi_cmd *cmd, u32 offset, u32 length)
- {
- struct iscsi_r2t *r2t;
- if (cmd->unsolicited_data)
- return 0;
- r2t = iscsit_get_r2t_for_eos(cmd, offset, length);
- if (!r2t)
- return -1;
- spin_lock_bh(&cmd->r2t_lock);
- r2t->seq_complete = 1;
- cmd->outstanding_r2ts--;
- spin_unlock_bh(&cmd->r2t_lock);
- return 0;
- }
- static int iscsit_dataout_update_datapduinorder_no(
- struct iscsi_cmd *cmd,
- u32 data_sn,
- int f_bit)
- {
- int ret = 0;
- struct iscsi_pdu *pdu = cmd->pdu_ptr;
- pdu->data_sn = data_sn;
- switch (pdu->status) {
- case ISCSI_PDU_NOT_RECEIVED:
- pdu->status = ISCSI_PDU_RECEIVED_OK;
- break;
- case ISCSI_PDU_CRC_FAILED:
- pdu->status = ISCSI_PDU_RECEIVED_OK;
- break;
- case ISCSI_PDU_TIMED_OUT:
- pdu->status = ISCSI_PDU_RECEIVED_OK;
- break;
- default:
- return DATAOUT_CANNOT_RECOVER;
- }
- if (f_bit) {
- ret = iscsit_dataout_datapduinorder_no_fbit(cmd, pdu);
- if (ret == DATAOUT_CANNOT_RECOVER)
- return ret;
- }
- return DATAOUT_NORMAL;
- }
- static int iscsit_dataout_post_crc_passed(
- struct iscsi_cmd *cmd,
- unsigned char *buf)
- {
- int ret, send_r2t = 0;
- struct iscsi_conn *conn = cmd->conn;
- struct iscsi_seq *seq = NULL;
- struct iscsi_data *hdr = (struct iscsi_data *) buf;
- u32 payload_length = ntoh24(hdr->dlength);
- if (cmd->unsolicited_data) {
- if ((cmd->first_burst_len + payload_length) ==
- conn->sess->sess_ops->FirstBurstLength) {
- if (iscsit_dataout_update_r2t(cmd, be32_to_cpu(hdr->offset),
- payload_length) < 0)
- return DATAOUT_CANNOT_RECOVER;
- send_r2t = 1;
- }
- if (!conn->sess->sess_ops->DataPDUInOrder) {
- ret = iscsit_dataout_update_datapduinorder_no(cmd,
- be32_to_cpu(hdr->datasn),
- (hdr->flags & ISCSI_FLAG_CMD_FINAL));
- if (ret == DATAOUT_CANNOT_RECOVER)
- return ret;
- }
- cmd->first_burst_len += payload_length;
- if (conn->sess->sess_ops->DataSequenceInOrder)
- cmd->data_sn++;
- else {
- seq = cmd->seq_ptr;
- seq->data_sn++;
- seq->offset += payload_length;
- }
- if (send_r2t) {
- if (seq)
- seq->status = DATAOUT_SEQUENCE_COMPLETE;
- cmd->first_burst_len = 0;
- cmd->unsolicited_data = 0;
- }
- } else {
- if (conn->sess->sess_ops->DataSequenceInOrder) {
- if ((cmd->next_burst_len + payload_length) ==
- conn->sess->sess_ops->MaxBurstLength) {
- if (iscsit_dataout_update_r2t(cmd,
- be32_to_cpu(hdr->offset),
- payload_length) < 0)
- return DATAOUT_CANNOT_RECOVER;
- send_r2t = 1;
- }
- if (!conn->sess->sess_ops->DataPDUInOrder) {
- ret = iscsit_dataout_update_datapduinorder_no(
- cmd, be32_to_cpu(hdr->datasn),
- (hdr->flags & ISCSI_FLAG_CMD_FINAL));
- if (ret == DATAOUT_CANNOT_RECOVER)
- return ret;
- }
- cmd->next_burst_len += payload_length;
- cmd->data_sn++;
- if (send_r2t)
- cmd->next_burst_len = 0;
- } else {
- seq = cmd->seq_ptr;
- if ((seq->next_burst_len + payload_length) ==
- seq->xfer_len) {
- if (iscsit_dataout_update_r2t(cmd,
- be32_to_cpu(hdr->offset),
- payload_length) < 0)
- return DATAOUT_CANNOT_RECOVER;
- send_r2t = 1;
- }
- if (!conn->sess->sess_ops->DataPDUInOrder) {
- ret = iscsit_dataout_update_datapduinorder_no(
- cmd, be32_to_cpu(hdr->datasn),
- (hdr->flags & ISCSI_FLAG_CMD_FINAL));
- if (ret == DATAOUT_CANNOT_RECOVER)
- return ret;
- }
- seq->data_sn++;
- seq->offset += payload_length;
- seq->next_burst_len += payload_length;
- if (send_r2t) {
- seq->next_burst_len = 0;
- seq->status = DATAOUT_SEQUENCE_COMPLETE;
- }
- }
- }
- if (send_r2t && conn->sess->sess_ops->DataSequenceInOrder)
- cmd->data_sn = 0;
- cmd->write_data_done += payload_length;
- if (cmd->write_data_done == cmd->se_cmd.data_length)
- return DATAOUT_SEND_TO_TRANSPORT;
- else if (send_r2t)
- return DATAOUT_SEND_R2T;
- else
- return DATAOUT_NORMAL;
- }
- static int iscsit_dataout_post_crc_failed(
- struct iscsi_cmd *cmd,
- unsigned char *buf)
- {
- struct iscsi_conn *conn = cmd->conn;
- struct iscsi_pdu *pdu;
- struct iscsi_data *hdr = (struct iscsi_data *) buf;
- u32 payload_length = ntoh24(hdr->dlength);
- if (conn->sess->sess_ops->DataPDUInOrder)
- goto recover;
- /*
- * The rest of this function is only called when DataPDUInOrder=No.
- */
- pdu = cmd->pdu_ptr;
- switch (pdu->status) {
- case ISCSI_PDU_NOT_RECEIVED:
- pdu->status = ISCSI_PDU_CRC_FAILED;
- break;
- case ISCSI_PDU_CRC_FAILED:
- break;
- case ISCSI_PDU_TIMED_OUT:
- pdu->status = ISCSI_PDU_CRC_FAILED;
- break;
- default:
- return DATAOUT_CANNOT_RECOVER;
- }
- recover:
- return iscsit_recover_dataout_sequence(cmd, be32_to_cpu(hdr->offset),
- payload_length);
- }
- /*
- * Called from iscsit_handle_data_out() before DataOUT Payload is received
- * and CRC computed.
- */
- int iscsit_check_pre_dataout(
- struct iscsi_cmd *cmd,
- unsigned char *buf)
- {
- int ret;
- struct iscsi_conn *conn = cmd->conn;
- ret = iscsit_dataout_within_command_recovery_check(cmd, buf);
- if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
- (ret == DATAOUT_CANNOT_RECOVER))
- return ret;
- ret = iscsit_dataout_check_datasn(cmd, buf);
- if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
- (ret == DATAOUT_CANNOT_RECOVER))
- return ret;
- if (cmd->unsolicited_data) {
- ret = iscsit_dataout_check_unsolicited_sequence(cmd, buf);
- if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
- (ret == DATAOUT_CANNOT_RECOVER))
- return ret;
- } else {
- ret = iscsit_dataout_check_sequence(cmd, buf);
- if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
- (ret == DATAOUT_CANNOT_RECOVER))
- return ret;
- }
- return (conn->sess->sess_ops->DataPDUInOrder) ?
- iscsit_dataout_pre_datapduinorder_yes(cmd, buf) :
- iscsit_dataout_pre_datapduinorder_no(cmd, buf);
- }
- /*
- * Called from iscsit_handle_data_out() after DataOUT Payload is received
- * and CRC computed.
- */
- int iscsit_check_post_dataout(
- struct iscsi_cmd *cmd,
- unsigned char *buf,
- u8 data_crc_failed)
- {
- struct iscsi_conn *conn = cmd->conn;
- cmd->dataout_timeout_retries = 0;
- if (!data_crc_failed)
- return iscsit_dataout_post_crc_passed(cmd, buf);
- else {
- if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
- pr_err("Unable to recover from DataOUT CRC"
- " failure while ERL=0, closing session.\n");
- iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR,
- buf);
- return DATAOUT_CANNOT_RECOVER;
- }
- iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR, buf);
- return iscsit_dataout_post_crc_failed(cmd, buf);
- }
- }
- static void iscsit_handle_time2retain_timeout(unsigned long data)
- {
- struct iscsi_session *sess = (struct iscsi_session *) data;
- struct iscsi_portal_group *tpg = sess->tpg;
- struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
- spin_lock_bh(&se_tpg->session_lock);
- if (sess->time2retain_timer_flags & ISCSI_TF_STOP) {
- spin_unlock_bh(&se_tpg->session_lock);
- return;
- }
- if (atomic_read(&sess->session_reinstatement)) {
- pr_err("Exiting Time2Retain handler because"
- " session_reinstatement=1\n");
- spin_unlock_bh(&se_tpg->session_lock);
- return;
- }
- sess->time2retain_timer_flags |= ISCSI_TF_EXPIRED;
- pr_err("Time2Retain timer expired for SID: %u, cleaning up"
- " iSCSI session.\n", sess->sid);
- {
- struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
- if (tiqn) {
- spin_lock(&tiqn->sess_err_stats.lock);
- strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
- (void *)sess->sess_ops->InitiatorName);
- tiqn->sess_err_stats.last_sess_failure_type =
- ISCSI_SESS_ERR_CXN_TIMEOUT;
- tiqn->sess_err_stats.cxn_timeout_errors++;
- atomic_long_inc(&sess->conn_timeout_errors);
- spin_unlock(&tiqn->sess_err_stats.lock);
- }
- }
- spin_unlock_bh(&se_tpg->session_lock);
- iscsit_close_session(sess);
- }
- void iscsit_start_time2retain_handler(struct iscsi_session *sess)
- {
- int tpg_active;
- /*
- * Only start Time2Retain timer when the associated TPG is still in
- * an ACTIVE (eg: not disabled or shutdown) state.
- */
- spin_lock(&sess->tpg->tpg_state_lock);
- tpg_active = (sess->tpg->tpg_state == TPG_STATE_ACTIVE);
- spin_unlock(&sess->tpg->tpg_state_lock);
- if (!tpg_active)
- return;
- if (sess->time2retain_timer_flags & ISCSI_TF_RUNNING)
- return;
- pr_debug("Starting Time2Retain timer for %u seconds on"
- " SID: %u\n", sess->sess_ops->DefaultTime2Retain, sess->sid);
- init_timer(&sess->time2retain_timer);
- sess->time2retain_timer.expires =
- (get_jiffies_64() + sess->sess_ops->DefaultTime2Retain * HZ);
- sess->time2retain_timer.data = (unsigned long)sess;
- sess->time2retain_timer.function = iscsit_handle_time2retain_timeout;
- sess->time2retain_timer_flags &= ~ISCSI_TF_STOP;
- sess->time2retain_timer_flags |= ISCSI_TF_RUNNING;
- add_timer(&sess->time2retain_timer);
- }
- /*
- * Called with spin_lock_bh(&struct se_portal_group->session_lock) held
- */
- int iscsit_stop_time2retain_timer(struct iscsi_session *sess)
- {
- struct iscsi_portal_group *tpg = sess->tpg;
- struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
- if (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)
- return -1;
- if (!(sess->time2retain_timer_flags & ISCSI_TF_RUNNING))
- return 0;
- sess->time2retain_timer_flags |= ISCSI_TF_STOP;
- spin_unlock(&se_tpg->session_lock);
- del_timer_sync(&sess->time2retain_timer);
- spin_lock(&se_tpg->session_lock);
- sess->time2retain_timer_flags &= ~ISCSI_TF_RUNNING;
- pr_debug("Stopped Time2Retain Timer for SID: %u\n",
- sess->sid);
- return 0;
- }
- void iscsit_connection_reinstatement_rcfr(struct iscsi_conn *conn)
- {
- spin_lock_bh(&conn->state_lock);
- if (atomic_read(&conn->connection_exit)) {
- spin_unlock_bh(&conn->state_lock);
- goto sleep;
- }
- if (atomic_read(&conn->transport_failed)) {
- spin_unlock_bh(&conn->state_lock);
- goto sleep;
- }
- spin_unlock_bh(&conn->state_lock);
- if (conn->tx_thread && conn->tx_thread_active)
- send_sig(SIGINT, conn->tx_thread, 1);
- if (conn->rx_thread && conn->rx_thread_active)
- send_sig(SIGINT, conn->rx_thread, 1);
- sleep:
- wait_for_completion(&conn->conn_wait_rcfr_comp);
- complete(&conn->conn_post_wait_comp);
- }
- void iscsit_cause_connection_reinstatement(struct iscsi_conn *conn, int sleep)
- {
- spin_lock_bh(&conn->state_lock);
- if (atomic_read(&conn->connection_exit)) {
- spin_unlock_bh(&conn->state_lock);
- return;
- }
- if (atomic_read(&conn->transport_failed)) {
- spin_unlock_bh(&conn->state_lock);
- return;
- }
- if (atomic_read(&conn->connection_reinstatement)) {
- spin_unlock_bh(&conn->state_lock);
- return;
- }
- if (conn->tx_thread && conn->tx_thread_active)
- send_sig(SIGINT, conn->tx_thread, 1);
- if (conn->rx_thread && conn->rx_thread_active)
- send_sig(SIGINT, conn->rx_thread, 1);
- atomic_set(&conn->connection_reinstatement, 1);
- if (!sleep) {
- spin_unlock_bh(&conn->state_lock);
- return;
- }
- atomic_set(&conn->sleep_on_conn_wait_comp, 1);
- spin_unlock_bh(&conn->state_lock);
- wait_for_completion(&conn->conn_wait_comp);
- complete(&conn->conn_post_wait_comp);
- }
- EXPORT_SYMBOL(iscsit_cause_connection_reinstatement);
- void iscsit_fall_back_to_erl0(struct iscsi_session *sess)
- {
- pr_debug("Falling back to ErrorRecoveryLevel=0 for SID:"
- " %u\n", sess->sid);
- atomic_set(&sess->session_fall_back_to_erl0, 1);
- }
- static void iscsit_handle_connection_cleanup(struct iscsi_conn *conn)
- {
- struct iscsi_session *sess = conn->sess;
- if ((sess->sess_ops->ErrorRecoveryLevel == 2) &&
- !atomic_read(&sess->session_reinstatement) &&
- !atomic_read(&sess->session_fall_back_to_erl0))
- iscsit_connection_recovery_transport_reset(conn);
- else {
- pr_debug("Performing cleanup for failed iSCSI"
- " Connection ID: %hu from %s\n", conn->cid,
- sess->sess_ops->InitiatorName);
- iscsit_close_connection(conn);
- }
- }
- void iscsit_take_action_for_connection_exit(struct iscsi_conn *conn, bool *conn_freed)
- {
- *conn_freed = false;
- spin_lock_bh(&conn->state_lock);
- if (atomic_read(&conn->connection_exit)) {
- spin_unlock_bh(&conn->state_lock);
- return;
- }
- atomic_set(&conn->connection_exit, 1);
- if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) {
- spin_unlock_bh(&conn->state_lock);
- iscsit_close_connection(conn);
- *conn_freed = true;
- return;
- }
- if (conn->conn_state == TARG_CONN_STATE_CLEANUP_WAIT) {
- spin_unlock_bh(&conn->state_lock);
- return;
- }
- pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
- conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
- spin_unlock_bh(&conn->state_lock);
- iscsit_handle_connection_cleanup(conn);
- *conn_freed = true;
- }
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