/****************************************************************************** * 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 "iscsi_target_core.h" #include "iscsi_target_seq_pdu_list.h" #include "iscsi_target_tq.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) { int dump = 0, recovery = 0; 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); recovery = 1; 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); 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 || dump) ? DATAOUT_WITHIN_COMMAND_RECOVERY : DATAOUT_NORMAL; } 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 = ISCSI_TPG_S(sess); 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++; sess->conn_timeout_errors++; spin_unlock(&tiqn->sess_err_stats.lock); } } spin_unlock_bh(&se_tpg->session_lock); target_put_session(sess->se_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(&ISCSI_TPG_S(sess)->tpg_state_lock); tpg_active = (ISCSI_TPG_S(sess)->tpg_state == TPG_STATE_ACTIVE); spin_unlock(&ISCSI_TPG_S(sess)->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 = ISCSI_TPG_S(sess); 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); iscsi_thread_set_force_reinstatement(conn); 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 (iscsi_thread_set_force_reinstatement(conn) < 0) { spin_unlock_bh(&conn->state_lock); return; } 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); } /* * This is the simple function that makes the magic of * sync and steering happen in the follow paradoxical order: * * 0) Receive conn->of_marker (bytes left until next OFMarker) * bytes into an offload buffer. When we pass the exact number * of bytes in conn->of_marker, iscsit_dump_data_payload() and hence * rx_data() will automatically receive the identical u32 marker * values and store it in conn->of_marker_offset; * 1) Now conn->of_marker_offset will contain the offset to the start * of the next iSCSI PDU. Dump these remaining bytes into another * offload buffer. * 2) We are done! * Next byte in the TCP stream will contain the next iSCSI PDU! * Cool Huh?! */ int iscsit_recover_from_unknown_opcode(struct iscsi_conn *conn) { /* * Make sure the remaining bytes to next maker is a sane value. */ if (conn->of_marker > (conn->conn_ops->OFMarkInt * 4)) { pr_err("Remaining bytes to OFMarker: %u exceeds" " OFMarkInt bytes: %u.\n", conn->of_marker, conn->conn_ops->OFMarkInt * 4); return -1; } pr_debug("Advancing %u bytes in TCP stream to get to the" " next OFMarker.\n", conn->of_marker); if (iscsit_dump_data_payload(conn, conn->of_marker, 0) < 0) return -1; /* * Make sure the offset marker we retrived is a valid value. */ if (conn->of_marker_offset > (ISCSI_HDR_LEN + (ISCSI_CRC_LEN * 2) + conn->conn_ops->MaxRecvDataSegmentLength)) { pr_err("OfMarker offset value: %u exceeds limit.\n", conn->of_marker_offset); return -1; } pr_debug("Discarding %u bytes of TCP stream to get to the" " next iSCSI Opcode.\n", conn->of_marker_offset); if (iscsit_dump_data_payload(conn, conn->of_marker_offset, 0) < 0) return -1; return 0; }