| /****************************************************************************** |
| * 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 <linux/sched/signal.h> |
| |
| #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 = (cmd->write_data_done + |
| ((cmd->se_cmd.data_length > |
| conn->sess->sess_ops->FirstBurstLength) ? |
| conn->sess->sess_ops->FirstBurstLength : cmd->se_cmd.data_length)); |
| 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) |
| { |
| 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); |
| 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); |
| } |