From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx> This patch adds support for RFC-3720 compatiable ErrorRecoveryLevel support as defined in Section 6.1.5. Error Recovery Hierarchy. This includes support for iSCSI session reinstatement, iSCSI within command and within connection recovery, and explict/implict connection recovery (CSM-E and CSM-I) from state machines in Section 7 of RFC-3720. These functions are called from iscsi_target.c to handle processing based on the negotiated session-wide ErrorRecoveryLevel parameter. Signed-off-by: Nicholas A. Bellinger <nab@xxxxxxxxxxxxxxx> --- drivers/target/iscsi/iscsi_target_erl0.c | 1005 +++++++++++++++++++++++ drivers/target/iscsi/iscsi_target_erl0.h | 17 + drivers/target/iscsi/iscsi_target_erl1.c | 1305 ++++++++++++++++++++++++++++++ drivers/target/iscsi/iscsi_target_erl1.h | 28 + drivers/target/iscsi/iscsi_target_erl2.c | 483 +++++++++++ drivers/target/iscsi/iscsi_target_erl2.h | 18 + 6 files changed, 2856 insertions(+), 0 deletions(-) create mode 100644 drivers/target/iscsi/iscsi_target_erl0.c create mode 100644 drivers/target/iscsi/iscsi_target_erl0.h create mode 100644 drivers/target/iscsi/iscsi_target_erl1.c create mode 100644 drivers/target/iscsi/iscsi_target_erl1.h create mode 100644 drivers/target/iscsi/iscsi_target_erl2.c create mode 100644 drivers/target/iscsi/iscsi_target_erl2.h diff --git a/drivers/target/iscsi/iscsi_target_erl0.c b/drivers/target/iscsi/iscsi_target_erl0.c new file mode 100644 index 0000000..214e0ea --- /dev/null +++ b/drivers/target/iscsi/iscsi_target_erl0.c @@ -0,0 +1,1005 @@ +/****************************************************************************** + * This file contains error recovery level zero functions used by + * the iSCSI Target driver. + * + * © Copyright 2007-2011 RisingTide Systems LLC. + * + * Licensed to the Linux Foundation under the General Public License (GPL) version 2. + * + * Author: Nicholas A. Bellinger <nab@xxxxxxxxxxxxxxx> + * + * 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_transport.h> + +#include "iscsi_target_debug.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->data_length > + conn->sess->sess_ops->FirstBurstLength) ? + conn->sess->sess_ops->FirstBurstLength : 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->data_length > + conn->sess->sess_ops->MaxBurstLength) ? + (cmd->write_data_done + + conn->sess->sess_ops->MaxBurstLength) : 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->data_length) ? cmd->data_length : + (cmd->seq_end_offset + + conn->sess->sess_ops->MaxBurstLength); + } +} + +static inline 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 != hdr->offset)) + goto dump; + + cmd->cmd_flags &= ~ICF_WITHIN_COMMAND_RECOVERY; + } else { + struct iscsi_seq *seq; + + seq = iscsit_get_seq_holder(cmd, 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 != hdr->offset) || + (seq->data_sn != hdr->datasn))) + goto dump; + } else { + if ((seq->status == + DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY) && + (seq->data_sn != 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: + printk(KERN_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 inline 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 ((hdr->offset < cmd->seq_start_offset) || + ((hdr->offset + payload_length) > cmd->seq_end_offset)) { + printk(KERN_ERR "Command ITT: 0x%08x with Offset: %u," + " Length: %u outside of Unsolicited Sequence %u:%u while" + " DataSequenceInOrder=Yes.\n", cmd->init_task_tag, + 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) { + printk(KERN_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(SE_CMD(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->data_length) && + (first_burst_len != conn->sess->sess_ops->FirstBurstLength)) { + printk(KERN_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->data_length); + transport_send_check_condition_and_sense(SE_CMD(cmd), + TCM_INCORRECT_AMOUNT_OF_DATA, 0); + return DATAOUT_CANNOT_RECOVER; + } + } else { + if (first_burst_len == conn->sess->sess_ops->FirstBurstLength) { + printk(KERN_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->data_length) { + printk(KERN_ERR "Command ITT: 0x%08x reached" + " ExpXferLen: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol" + " error.\n", cmd->init_task_tag, cmd->data_length); + return DATAOUT_CANNOT_RECOVER; + } + } + +out: + return DATAOUT_NORMAL; +} + +static inline 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 ((hdr->offset < cmd->seq_start_offset) || + ((hdr->offset + payload_length) > cmd->seq_end_offset)) { + printk(KERN_ERR "Command ITT: 0x%08x with Offset: %u," + " Length: %u outside of Sequence %u:%u while" + " DataSequenceInOrder=Yes.\n", cmd->init_task_tag, + 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, 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) { + printk(KERN_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->data_length)) { + printk(KERN_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) { + printk(KERN_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) { + printk(KERN_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->data_length) { + printk(KERN_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) { + printk(KERN_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 inline 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 (hdr->datasn > data_sn) { + printk(KERN_ERR "Command ITT: 0x%08x, received DataSN: 0x%08x" + " higher than expected 0x%08x.\n", cmd->init_task_tag, + hdr->datasn, data_sn); + recovery = 1; + goto recover; + } else if (hdr->datasn < data_sn) { + printk(KERN_ERR "Command ITT: 0x%08x, received DataSN: 0x%08x" + " lower than expected 0x%08x, discarding payload.\n", + cmd->init_task_tag, hdr->datasn, data_sn); + dump = 1; + goto dump; + } + + return DATAOUT_NORMAL; + +recover: + if (!conn->sess->sess_ops->ErrorRecoveryLevel) { + printk(KERN_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 inline 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 + * occured 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 occured and fail the connection. + */ + if (conn->sess->sess_ops->DataSequenceInOrder) { + if (hdr->offset != cmd->write_data_done) { + printk(KERN_ERR "Command ITT: 0x%08x, received offset" + " %u different than expected %u.\n", cmd->init_task_tag, + hdr->offset, cmd->write_data_done); + recovery = 1; + goto recover; + } + } else { + struct iscsi_seq *seq = cmd->seq_ptr; + + if (hdr->offset > seq->offset) { + printk(KERN_ERR "Command ITT: 0x%08x, received offset" + " %u greater than expected %u.\n", cmd->init_task_tag, + hdr->offset, seq->offset); + recovery = 1; + goto recover; + } else if (hdr->offset < seq->offset) { + printk(KERN_ERR "Command ITT: 0x%08x, received offset" + " %u less than expected %u, discarding payload.\n", + cmd->init_task_tag, hdr->offset, seq->offset); + dump = 1; + goto dump; + } + } + + return DATAOUT_NORMAL; + +recover: + if (!conn->sess->sess_ops->ErrorRecoveryLevel) { + printk(KERN_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, + hdr->offset, payload_length) : + (dump) ? DATAOUT_WITHIN_COMMAND_RECOVERY : DATAOUT_NORMAL; +} + +static inline 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, 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: + printk(KERN_ERR "Command ITT: 0x%08x received already gotten" + " Offset: %u, Length: %u\n", cmd->init_task_tag, + 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 inline 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, 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, + 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, 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, 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, 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, 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; + + return (cmd->write_data_done == cmd->data_length) ? + DATAOUT_SEND_TO_TRANSPORT : (send_r2t) ? + DATAOUT_SEND_R2T : DATAOUT_NORMAL; +} + +static inline 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, hdr->offset, payload_length); +} + +/* + * Called from iscsit_handle_data_out() before DataOUT Payload is received + * and CRC computed. + */ +extern 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) { + printk(KERN_ERR "Unable to recover from DataOUT CRC" + " failure while ERL=0, closing session.\n"); + iscsit_add_reject_from_cmd(ISCSI_REASON_DATA_DIGEST_ERROR, + 1, 0, buf, cmd); + return DATAOUT_CANNOT_RECOVER; + } + + iscsit_add_reject_from_cmd(ISCSI_REASON_DATA_DIGEST_ERROR, + 0, 0, buf, cmd); + 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)) { + printk(KERN_ERR "Exiting Time2Retain handler because" + " session_reinstatement=1\n"); + spin_unlock_bh(&se_tpg->session_lock); + return; + } + sess->time2retain_timer_flags |= ISCSI_TF_EXPIRED; + + printk(KERN_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); + iscsit_close_session(sess); +} + +extern void iscsit_start_time2retain_handler(struct iscsi_session *sess) +{ + int tpg_active; + /* + * Only start Time2Retain timer when the assoicated 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; + + TRACE(TRACE_TIMER, "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 + */ +extern 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_bh(&se_tpg->session_lock); + + del_timer_sync(&sess->time2retain_timer); + + spin_lock_bh(&se_tpg->session_lock); + sess->time2retain_timer_flags &= ~ISCSI_TF_RUNNING; + TRACE(TRACE_TIMER, "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); +} + +void iscsit_fall_back_to_erl0(struct iscsi_session *sess) +{ + TRACE(TRACE_ERL0, "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 { + TRACE(TRACE_ERL0, "Performing cleanup for failed iSCSI" + " Connection ID: %hu from %s\n", conn->cid, + sess->sess_ops->InitiatorName); + iscsit_close_connection(conn); + } +} + +extern 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; + } + + TRACE(TRACE_STATE, "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)) { + printk(KERN_ERR "Remaining bytes to OFMarker: %u exceeds" + " OFMarkInt bytes: %u.\n", conn->of_marker, + conn->conn_ops->OFMarkInt * 4); + return -1; + } + + TRACE(TRACE_ERL1, "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 + (CRC_LEN * 2) + + conn->conn_ops->MaxRecvDataSegmentLength)) { + printk(KERN_ERR "OfMarker offset value: %u exceeds limit.\n", + conn->of_marker_offset); + return -1; + } + + TRACE(TRACE_ERL1, "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; +} diff --git a/drivers/target/iscsi/iscsi_target_erl0.h b/drivers/target/iscsi/iscsi_target_erl0.h new file mode 100644 index 0000000..c29c59f --- /dev/null +++ b/drivers/target/iscsi/iscsi_target_erl0.h @@ -0,0 +1,17 @@ +#ifndef ISCSI_TARGET_ERL0_H +#define ISCSI_TARGET_ERL0_H + +extern void iscsit_set_dataout_sequence_values(struct iscsi_cmd *); +extern int iscsit_check_pre_dataout(struct iscsi_cmd *, unsigned char *); +extern int iscsit_check_post_dataout(struct iscsi_cmd *, unsigned char *, u8); +extern void iscsit_start_time2retain_handler(struct iscsi_session *); +extern int iscsit_stop_time2retain_timer(struct iscsi_session *); +extern void iscsit_connection_reinstatement_rcfr(struct iscsi_conn *); +extern void iscsit_cause_connection_reinstatement(struct iscsi_conn *, int); +extern void iscsit_fall_back_to_erl0(struct iscsi_session *); +extern void iscsit_take_action_for_connection_exit(struct iscsi_conn *); +extern int iscsit_recover_from_unknown_opcode(struct iscsi_conn *); + +extern struct iscsi_global *iscsi_global; + +#endif /*** ISCSI_TARGET_ERL0_H ***/ diff --git a/drivers/target/iscsi/iscsi_target_erl1.c b/drivers/target/iscsi/iscsi_target_erl1.c new file mode 100644 index 0000000..b616e23 --- /dev/null +++ b/drivers/target/iscsi/iscsi_target_erl1.c @@ -0,0 +1,1305 @@ +/******************************************************************************* + * This file contains error recovery level one used by the iSCSI Target driver. + * + * © Copyright 2007-2011 RisingTide Systems LLC. + * + * Licensed to the Linux Foundation under the General Public License (GPL) version 2. + * + * Author: Nicholas A. Bellinger <nab@xxxxxxxxxxxxxxx> + * + * 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/list.h> +#include <scsi/iscsi_proto.h> +#include <target/target_core_base.h> +#include <target/target_core_transport.h> + +#include "iscsi_target_debug.h" +#include "iscsi_target_core.h" +#include "iscsi_target_seq_pdu_list.h" +#include "iscsi_target_datain_values.h" +#include "iscsi_target_device.h" +#include "iscsi_target_tpg.h" +#include "iscsi_target_util.h" +#include "iscsi_target_erl0.h" +#include "iscsi_target_erl1.h" +#include "iscsi_target_erl2.h" +#include "iscsi_target.h" + +#define OFFLOAD_BUF_SIZE 32768 + +/* + * Used to dump excess datain payload for certain error recovery + * situations. Receive in OFFLOAD_BUF_SIZE max of datain per rx_data(). + * + * dump_padding_digest denotes if padding and data digests need + * to be dumped. + */ +int iscsit_dump_data_payload( + struct iscsi_conn *conn, + u32 buf_len, + int dump_padding_digest) +{ + char *buf, pad_bytes[4]; + int ret = DATAOUT_WITHIN_COMMAND_RECOVERY, rx_got; + u32 length, padding, offset = 0, size; + struct kvec iov; + + length = (buf_len > OFFLOAD_BUF_SIZE) ? OFFLOAD_BUF_SIZE : buf_len; + + buf = kzalloc(length, GFP_ATOMIC); + if (!buf) { + printk(KERN_ERR "Unable to allocate %u bytes for offload" + " buffer.\n", length); + return -1; + } + memset(&iov, 0, sizeof(struct kvec)); + + while (offset < buf_len) { + size = ((offset + length) > buf_len) ? + (buf_len - offset) : length; + + iov.iov_len = size; + iov.iov_base = buf; + + rx_got = rx_data(conn, &iov, 1, size); + if (rx_got != size) { + ret = DATAOUT_CANNOT_RECOVER; + goto out; + } + + offset += size; + } + + if (!dump_padding_digest) + goto out; + + padding = ((-buf_len) & 3); + if (padding != 0) { + iov.iov_len = padding; + iov.iov_base = pad_bytes; + + rx_got = rx_data(conn, &iov, 1, padding); + if (rx_got != padding) { + ret = DATAOUT_CANNOT_RECOVER; + goto out; + } + } + + if (conn->conn_ops->DataDigest) { + u32 data_crc; + + iov.iov_len = CRC_LEN; + iov.iov_base = &data_crc; + + rx_got = rx_data(conn, &iov, 1, CRC_LEN); + if (rx_got != CRC_LEN) { + ret = DATAOUT_CANNOT_RECOVER; + goto out; + } + } + +out: + kfree(buf); + return ret; +} + +/* + * Used for retransmitting R2Ts from a R2T SNACK request. + */ +static int iscsit_send_recovery_r2t_for_snack( + struct iscsi_cmd *cmd, + struct iscsi_r2t *r2t) +{ + /* + * If the struct iscsi_r2t has not been sent yet, we can safely + * ignore retransmission + * of the R2TSN in question. + */ + spin_lock_bh(&cmd->r2t_lock); + if (!r2t->sent_r2t) { + spin_unlock_bh(&cmd->r2t_lock); + return 0; + } + r2t->sent_r2t = 0; + spin_unlock_bh(&cmd->r2t_lock); + + iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T); + + return 0; +} + +static int iscsit_handle_r2t_snack( + struct iscsi_cmd *cmd, + unsigned char *buf, + u32 begrun, + u32 runlength) +{ + u32 last_r2tsn; + struct iscsi_r2t *r2t; + + /* + * Make sure the initiator is not requesting retransmission + * of R2TSNs already acknowledged by a TMR TASK_REASSIGN. + */ + if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && + (begrun <= cmd->acked_data_sn)) { + printk(KERN_ERR "ITT: 0x%08x, R2T SNACK requesting" + " retransmission of R2TSN: 0x%08x to 0x%08x but already" + " acked to R2TSN: 0x%08x by TMR TASK_REASSIGN," + " protocol error.\n", cmd->init_task_tag, begrun, + (begrun + runlength), cmd->acked_data_sn); + + return iscsit_add_reject_from_cmd( + ISCSI_REASON_PROTOCOL_ERROR, + 1, 0, buf, cmd); + } + + if (runlength) { + if ((begrun + runlength) > cmd->r2t_sn) { + printk(KERN_ERR "Command ITT: 0x%08x received R2T SNACK" + " with BegRun: 0x%08x, RunLength: 0x%08x, exceeds" + " current R2TSN: 0x%08x, protocol error.\n", + cmd->init_task_tag, begrun, runlength, cmd->r2t_sn); + return iscsit_add_reject_from_cmd( + ISCSI_REASON_BOOKMARK_INVALID, 1, 0, buf, cmd); + } + last_r2tsn = (begrun + runlength); + } else + last_r2tsn = cmd->r2t_sn; + + while (begrun < last_r2tsn) { + r2t = iscsit_get_holder_for_r2tsn(cmd, begrun); + if (!r2t) + return -1; + if (iscsit_send_recovery_r2t_for_snack(cmd, r2t) < 0) + return -1; + + begrun++; + } + + return 0; +} + +/* + * Generates Offsets and NextBurstLength based on Begrun and Runlength + * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN. + * + * For DataSequenceInOrder=Yes and DataPDUInOrder=[Yes,No] only. + * + * FIXME: How is this handled for a RData SNACK? + */ +int iscsit_create_recovery_datain_values_datasequenceinorder_yes( + struct iscsi_cmd *cmd, + struct iscsi_datain_req *dr) +{ + u32 data_sn = 0, data_sn_count = 0; + u32 pdu_start = 0, seq_no = 0; + u32 begrun = dr->begrun; + struct iscsi_conn *conn = cmd->conn; + + while (begrun > data_sn++) { + data_sn_count++; + if ((dr->next_burst_len + + conn->conn_ops->MaxRecvDataSegmentLength) < + conn->sess->sess_ops->MaxBurstLength) { + dr->read_data_done += + conn->conn_ops->MaxRecvDataSegmentLength; + dr->next_burst_len += + conn->conn_ops->MaxRecvDataSegmentLength; + } else { + dr->read_data_done += + (conn->sess->sess_ops->MaxBurstLength - + dr->next_burst_len); + dr->next_burst_len = 0; + pdu_start += data_sn_count; + data_sn_count = 0; + seq_no++; + } + } + + if (!conn->sess->sess_ops->DataPDUInOrder) { + cmd->seq_no = seq_no; + cmd->pdu_start = pdu_start; + cmd->pdu_send_order = data_sn_count; + } + + return 0; +} + +/* + * Generates Offsets and NextBurstLength based on Begrun and Runlength + * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN. + * + * For DataSequenceInOrder=No and DataPDUInOrder=[Yes,No] only. + * + * FIXME: How is this handled for a RData SNACK? + */ +int iscsit_create_recovery_datain_values_datasequenceinorder_no( + struct iscsi_cmd *cmd, + struct iscsi_datain_req *dr) +{ + int found_seq = 0, i; + u32 data_sn, read_data_done = 0, seq_send_order = 0; + u32 begrun = dr->begrun; + u32 runlength = dr->runlength; + struct iscsi_conn *conn = cmd->conn; + struct iscsi_seq *first_seq = NULL, *seq = NULL; + + if (!cmd->seq_list) { + printk(KERN_ERR "struct iscsi_cmd->seq_list is NULL!\n"); + return -1; + } + + /* + * Calculate read_data_done for all sequences containing a + * first_datasn and last_datasn less than the BegRun. + * + * Locate the struct iscsi_seq the BegRun lies within and calculate + * NextBurstLenghth up to the DataSN based on MaxRecvDataSegmentLength. + * + * Also use struct iscsi_seq->seq_send_order to determine where to start. + */ + for (i = 0; i < cmd->seq_count; i++) { + seq = &cmd->seq_list[i]; + + if (!seq->seq_send_order) + first_seq = seq; + + /* + * No data has been transferred for this DataIN sequence, so the + * seq->first_datasn and seq->last_datasn have not been set. + */ + if (!seq->sent) { +#if 0 + printk(KERN_ERR "Ignoring non-sent sequence 0x%08x ->" + " 0x%08x\n\n", seq->first_datasn, + seq->last_datasn); +#endif + continue; + } + + /* + * This DataIN sequence is precedes the received BegRun, add the + * total xfer_len of the sequence to read_data_done and reset + * seq->pdu_send_order. + */ + if ((seq->first_datasn < begrun) && + (seq->last_datasn < begrun)) { +#if 0 + printk(KERN_ERR "Pre BegRun sequence 0x%08x ->" + " 0x%08x\n", seq->first_datasn, + seq->last_datasn); +#endif + read_data_done += cmd->seq_list[i].xfer_len; + seq->next_burst_len = seq->pdu_send_order = 0; + continue; + } + + /* + * The BegRun lies within this DataIN sequence. + */ + if ((seq->first_datasn <= begrun) && + (seq->last_datasn >= begrun)) { +#if 0 + printk(KERN_ERR "Found sequence begrun: 0x%08x in" + " 0x%08x -> 0x%08x\n", begrun, + seq->first_datasn, seq->last_datasn); +#endif + seq_send_order = seq->seq_send_order; + data_sn = seq->first_datasn; + seq->next_burst_len = seq->pdu_send_order = 0; + found_seq = 1; + + /* + * For DataPDUInOrder=Yes, while the first DataSN of + * the sequence is less than the received BegRun, add + * the MaxRecvDataSegmentLength to read_data_done and + * to the sequence's next_burst_len; + * + * For DataPDUInOrder=No, while the first DataSN of the + * sequence is less than the received BegRun, find the + * struct iscsi_pdu of the DataSN in question and add the + * MaxRecvDataSegmentLength to read_data_done and to the + * sequence's next_burst_len; + */ + if (conn->sess->sess_ops->DataPDUInOrder) { + while (data_sn < begrun) { + seq->pdu_send_order++; + read_data_done += + conn->conn_ops->MaxRecvDataSegmentLength; + seq->next_burst_len += + conn->conn_ops->MaxRecvDataSegmentLength; + data_sn++; + } + } else { + int j; + struct iscsi_pdu *pdu; + + while (data_sn < begrun) { + seq->pdu_send_order++; + + for (j = 0; j < seq->pdu_count; j++) { + pdu = &cmd->pdu_list[ + seq->pdu_start + j]; + if (pdu->data_sn == data_sn) { + read_data_done += + pdu->length; + seq->next_burst_len += + pdu->length; + } + } + data_sn++; + } + } + continue; + } + + /* + * This DataIN sequence is larger than the received BegRun, + * reset seq->pdu_send_order and continue. + */ + if ((seq->first_datasn > begrun) || + (seq->last_datasn > begrun)) { +#if 0 + printk(KERN_ERR "Post BegRun sequence 0x%08x -> 0x%08x\n", + seq->first_datasn, seq->last_datasn); +#endif + seq->next_burst_len = seq->pdu_send_order = 0; + continue; + } + } + + if (!found_seq) { + if (!begrun) { + if (!first_seq) { + printk(KERN_ERR "ITT: 0x%08x, Begrun: 0x%08x" + " but first_seq is NULL\n", + cmd->init_task_tag, begrun); + return -1; + } + seq_send_order = first_seq->seq_send_order; + seq->next_burst_len = seq->pdu_send_order = 0; + goto done; + } + + printk(KERN_ERR "Unable to locate struct iscsi_seq for ITT: 0x%08x," + " BegRun: 0x%08x, RunLength: 0x%08x while" + " DataSequenceInOrder=No and DataPDUInOrder=%s.\n", + cmd->init_task_tag, begrun, runlength, + (conn->sess->sess_ops->DataPDUInOrder) ? "Yes" : "No"); + return -1; + } + +done: + dr->read_data_done = read_data_done; + dr->seq_send_order = seq_send_order; + + return 0; +} + +static inline int iscsit_handle_recovery_datain( + struct iscsi_cmd *cmd, + unsigned char *buf, + u32 begrun, + u32 runlength) +{ + struct iscsi_conn *conn = cmd->conn; + struct iscsi_datain_req *dr; + struct se_cmd *se_cmd = &cmd->se_cmd; + + if (!atomic_read(&T_TASK(se_cmd)->t_transport_complete)) { + printk(KERN_ERR "Ignoring ITT: 0x%08x Data SNACK\n", + cmd->init_task_tag); + return 0; + } + + /* + * Make sure the initiator is not requesting retransmission + * of DataSNs already acknowledged by a Data ACK SNACK. + */ + if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && + (begrun <= cmd->acked_data_sn)) { + printk(KERN_ERR "ITT: 0x%08x, Data SNACK requesting" + " retransmission of DataSN: 0x%08x to 0x%08x but" + " already acked to DataSN: 0x%08x by Data ACK SNACK," + " protocol error.\n", cmd->init_task_tag, begrun, + (begrun + runlength), cmd->acked_data_sn); + + return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR, + 1, 0, buf, cmd); + } + + /* + * Make sure BegRun and RunLength in the Data SNACK are sane. + * Note: (cmd->data_sn - 1) will carry the maximum DataSN sent. + */ + if ((begrun + runlength) > (cmd->data_sn - 1)) { + printk(KERN_ERR "Initiator requesting BegRun: 0x%08x, RunLength" + ": 0x%08x greater than maximum DataSN: 0x%08x.\n", + begrun, runlength, (cmd->data_sn - 1)); + return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID, + 1, 0, buf, cmd); + } + + dr = iscsit_allocate_datain_req(); + if (!dr) + return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_NO_RESOURCES, + 1, 0, buf, cmd); + + dr->data_sn = dr->begrun = begrun; + dr->runlength = runlength; + dr->generate_recovery_values = 1; + dr->recovery = DATAIN_WITHIN_COMMAND_RECOVERY; + + iscsit_attach_datain_req(cmd, dr); + + cmd->i_state = ISTATE_SEND_DATAIN; + iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); + + return 0; +} + +int iscsit_handle_recovery_datain_or_r2t( + struct iscsi_conn *conn, + unsigned char *buf, + u32 init_task_tag, + u32 targ_xfer_tag, + u32 begrun, + u32 runlength) +{ + struct iscsi_cmd *cmd; + + cmd = iscsit_find_cmd_from_itt(conn, init_task_tag); + if (!cmd) + return 0; + + /* + * FIXME: This will not work for bidi commands. + */ + switch (cmd->data_direction) { + case DMA_TO_DEVICE: + return iscsit_handle_r2t_snack(cmd, buf, begrun, runlength); + case DMA_FROM_DEVICE: + return iscsit_handle_recovery_datain(cmd, buf, begrun, + runlength); + default: + printk(KERN_ERR "Unknown cmd->data_direction: 0x%02x\n", + cmd->data_direction); + return -1; + } + + return 0; +} + +/* #warning FIXME: Status SNACK needs to be dependent on OPCODE!!! */ +int iscsit_handle_status_snack( + struct iscsi_conn *conn, + u32 init_task_tag, + u32 targ_xfer_tag, + u32 begrun, + u32 runlength) +{ + u32 last_statsn; + struct iscsi_cmd *cmd = NULL; + + if (conn->exp_statsn > begrun) { + printk(KERN_ERR "Got Status SNACK Begrun: 0x%08x, RunLength:" + " 0x%08x but already got ExpStatSN: 0x%08x on CID:" + " %hu.\n", begrun, runlength, conn->exp_statsn, + conn->cid); + return 0; + } + + last_statsn = (!runlength) ? conn->stat_sn : (begrun + runlength); + + while (begrun < last_statsn) { + spin_lock_bh(&conn->cmd_lock); + list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) { + if (cmd->stat_sn == begrun) + break; + } + spin_unlock_bh(&conn->cmd_lock); + + if (!cmd) { + printk(KERN_ERR "Unable to find StatSN: 0x%08x for" + " a Status SNACK, assuming this was a" + " protactic SNACK for an untransmitted" + " StatSN, ignoring.\n", begrun); + begrun++; + continue; + } + + spin_lock_bh(&cmd->istate_lock); + if (cmd->i_state == ISTATE_SEND_DATAIN) { + spin_unlock_bh(&cmd->istate_lock); + printk(KERN_ERR "Ignoring Status SNACK for BegRun:" + " 0x%08x, RunLength: 0x%08x, assuming this was" + " a protactic SNACK for an untransmitted" + " StatSN\n", begrun, runlength); + begrun++; + continue; + } + spin_unlock_bh(&cmd->istate_lock); + + cmd->i_state = ISTATE_SEND_STATUS_RECOVERY; + iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); + begrun++; + } + + return 0; +} + +int iscsit_handle_data_ack( + struct iscsi_conn *conn, + u32 targ_xfer_tag, + u32 begrun, + u32 runlength) +{ + struct iscsi_cmd *cmd = NULL; + + cmd = iscsit_find_cmd_from_ttt(conn, targ_xfer_tag); + if (!cmd) { + printk(KERN_ERR "Data ACK SNACK for TTT: 0x%08x is" + " invalid.\n", targ_xfer_tag); + return -1; + } + + if (begrun <= cmd->acked_data_sn) { + printk(KERN_ERR "ITT: 0x%08x Data ACK SNACK BegRUN: 0x%08x is" + " less than the already acked DataSN: 0x%08x.\n", + cmd->init_task_tag, begrun, cmd->acked_data_sn); + return -1; + } + + /* + * For Data ACK SNACK, BegRun is the next expected DataSN. + * (see iSCSI v19: 10.16.6) + */ + cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; + cmd->acked_data_sn = (begrun - 1); + + TRACE(TRACE_ISCSI, "Received Data ACK SNACK for ITT: 0x%08x," + " updated acked DataSN to 0x%08x.\n", + cmd->init_task_tag, cmd->acked_data_sn); + + return 0; +} + +static int iscsit_send_recovery_r2t( + struct iscsi_cmd *cmd, + u32 offset, + u32 xfer_len) +{ + int ret; + + spin_lock_bh(&cmd->r2t_lock); + ret = iscsit_add_r2t_to_list(cmd, offset, xfer_len, 1, 0); + spin_unlock_bh(&cmd->r2t_lock); + + return ret; +} + +int iscsit_dataout_datapduinorder_no_fbit( + struct iscsi_cmd *cmd, + struct iscsi_pdu *pdu) +{ + int i, send_recovery_r2t = 0, recovery = 0; + u32 length = 0, offset = 0, pdu_count = 0, xfer_len = 0; + struct iscsi_conn *conn = cmd->conn; + struct iscsi_pdu *first_pdu = NULL; + + /* + * Get an struct iscsi_pdu pointer to the first PDU, and total PDU count + * of the DataOUT sequence. + */ + if (conn->sess->sess_ops->DataSequenceInOrder) { + for (i = 0; i < cmd->pdu_count; i++) { + if (cmd->pdu_list[i].seq_no == pdu->seq_no) { + if (!first_pdu) + first_pdu = &cmd->pdu_list[i]; + xfer_len += cmd->pdu_list[i].length; + pdu_count++; + } else if (pdu_count) + break; + } + } else { + struct iscsi_seq *seq = cmd->seq_ptr; + + first_pdu = &cmd->pdu_list[seq->pdu_start]; + pdu_count = seq->pdu_count; + } + + if (!first_pdu || !pdu_count) + return DATAOUT_CANNOT_RECOVER; + + /* + * Loop through the ending DataOUT Sequence checking each struct iscsi_pdu. + * The following ugly logic does batching of not received PDUs. + */ + for (i = 0; i < pdu_count; i++) { + if (first_pdu[i].status == ISCSI_PDU_RECEIVED_OK) { + if (!send_recovery_r2t) + continue; + + if (iscsit_send_recovery_r2t(cmd, offset, length) < 0) + return DATAOUT_CANNOT_RECOVER; + + send_recovery_r2t = length = offset = 0; + continue; + } + /* + * Set recovery = 1 for any missing, CRC failed, or timed + * out PDUs to let the DataOUT logic know that this sequence + * has not been completed yet. + * + * Also, only send a Recovery R2T for ISCSI_PDU_NOT_RECEIVED. + * We assume if the PDU either failed CRC or timed out + * that a Recovery R2T has already been sent. + */ + recovery = 1; + + if (first_pdu[i].status != ISCSI_PDU_NOT_RECEIVED) + continue; + + if (!offset) + offset = first_pdu[i].offset; + length += first_pdu[i].length; + + send_recovery_r2t = 1; + } + + if (send_recovery_r2t) + if (iscsit_send_recovery_r2t(cmd, offset, length) < 0) + return DATAOUT_CANNOT_RECOVER; + + return (!recovery) ? DATAOUT_NORMAL : DATAOUT_WITHIN_COMMAND_RECOVERY; +} + +static int iscsit_recalculate_dataout_values( + struct iscsi_cmd *cmd, + u32 pdu_offset, + u32 pdu_length, + u32 *r2t_offset, + u32 *r2t_length) +{ + int i; + struct iscsi_conn *conn = cmd->conn; + struct iscsi_pdu *pdu = NULL; + + if (conn->sess->sess_ops->DataSequenceInOrder) { + cmd->data_sn = 0; + + if (conn->sess->sess_ops->DataPDUInOrder) { + *r2t_offset = cmd->write_data_done; + *r2t_length = (cmd->seq_end_offset - + cmd->write_data_done); + return 0; + } + + *r2t_offset = cmd->seq_start_offset; + *r2t_length = (cmd->seq_end_offset - cmd->seq_start_offset); + + 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)) { + if (!cmd->unsolicited_data) + cmd->next_burst_len -= pdu->length; + else + cmd->first_burst_len -= pdu->length; + + cmd->write_data_done -= pdu->length; + pdu->status = ISCSI_PDU_NOT_RECEIVED; + } + } + } else { + struct iscsi_seq *seq = NULL; + + seq = iscsit_get_seq_holder(cmd, pdu_offset, pdu_length); + if (!seq) + return -1; + + *r2t_offset = seq->orig_offset; + *r2t_length = seq->xfer_len; + + cmd->write_data_done -= (seq->offset - seq->orig_offset); + if (cmd->immediate_data) + cmd->first_burst_len = cmd->write_data_done; + + 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) + return 0; + + 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; + } + } + + return 0; +} + +int iscsit_recover_dataout_sequence( + struct iscsi_cmd *cmd, + u32 pdu_offset, + u32 pdu_length) +{ + u32 r2t_length = 0, r2t_offset = 0; + + spin_lock_bh(&cmd->istate_lock); + cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY; + spin_unlock_bh(&cmd->istate_lock); + + if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length, + &r2t_offset, &r2t_length) < 0) + return DATAOUT_CANNOT_RECOVER; + + iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length); + + return DATAOUT_WITHIN_COMMAND_RECOVERY; +} + +static inline struct iscsi_ooo_cmdsn *iscsit_allocate_ooo_cmdsn(void) +{ + struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL; + + ooo_cmdsn = kmem_cache_zalloc(lio_ooo_cache, GFP_ATOMIC); + if (!ooo_cmdsn) { + printk(KERN_ERR "Unable to allocate memory for" + " struct iscsi_ooo_cmdsn.\n"); + return NULL; + } + INIT_LIST_HEAD(&ooo_cmdsn->ooo_list); + + return ooo_cmdsn; +} + +/* + * Called with sess->cmdsn_lock held. + */ +static inline int iscsit_attach_ooo_cmdsn( + struct iscsi_session *sess, + struct iscsi_ooo_cmdsn *ooo_cmdsn) +{ + struct iscsi_ooo_cmdsn *ooo_tail, *ooo_tmp; + /* + * We attach the struct iscsi_ooo_cmdsn entry to the out of order + * list in increasing CmdSN order. + * This allows iscsi_execute_ooo_cmdsns() to detect any + * additional CmdSN holes while performing delayed execution. + */ + if (list_empty(&sess->sess_ooo_cmdsn_list)) + list_add_tail(&ooo_cmdsn->ooo_list, + &sess->sess_ooo_cmdsn_list); + else { + ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev, + typeof(*ooo_tail), ooo_list); + /* + * CmdSN is greater than the tail of the list. + */ + if (ooo_tail->cmdsn < ooo_cmdsn->cmdsn) + list_add_tail(&ooo_cmdsn->ooo_list, + &sess->sess_ooo_cmdsn_list); + else { + /* + * CmdSN is either lower than the head, or somewhere + * in the middle. + */ + list_for_each_entry(ooo_tmp, &sess->sess_ooo_cmdsn_list, + ooo_list) { + while (ooo_tmp->cmdsn < ooo_cmdsn->cmdsn) + continue; + + list_add(&ooo_cmdsn->ooo_list, + &ooo_tmp->ooo_list); + break; + } + } + } + sess->ooo_cmdsn_count++; + + TRACE(TRACE_CMDSN, "Set out of order CmdSN count for SID:" + " %u to %hu.\n", sess->sid, sess->ooo_cmdsn_count); + + return 0; +} + +/* + * Removes an struct iscsi_ooo_cmdsn from a session's list, + * called with struct iscsi_session->cmdsn_lock held. + */ +void iscsit_remove_ooo_cmdsn( + struct iscsi_session *sess, + struct iscsi_ooo_cmdsn *ooo_cmdsn) +{ + list_del(&ooo_cmdsn->ooo_list); + kmem_cache_free(lio_ooo_cache, ooo_cmdsn); +} + +void iscsit_clear_ooo_cmdsns_for_conn(struct iscsi_conn *conn) +{ + struct iscsi_ooo_cmdsn *ooo_cmdsn; + struct iscsi_session *sess = conn->sess; + + spin_lock(&sess->cmdsn_lock); + list_for_each_entry(ooo_cmdsn, &sess->sess_ooo_cmdsn_list, ooo_list) { + if (ooo_cmdsn->cid != conn->cid) + continue; + + ooo_cmdsn->cmd = NULL; + } + spin_unlock(&sess->cmdsn_lock); +} + +/* + * Called with sess->cmdsn_lock held. + */ +int iscsit_execute_ooo_cmdsns(struct iscsi_session *sess) +{ + int ooo_count = 0; + struct iscsi_cmd *cmd = NULL; + struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; + + list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, + &sess->sess_ooo_cmdsn_list, ooo_list) { + if (ooo_cmdsn->cmdsn != sess->exp_cmd_sn) + continue; + + if (!ooo_cmdsn->cmd) { + sess->exp_cmd_sn++; + iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); + continue; + } + + cmd = ooo_cmdsn->cmd; + cmd->i_state = cmd->deferred_i_state; + ooo_count++; + sess->exp_cmd_sn++; + TRACE(TRACE_CMDSN, "Executing out of order CmdSN: 0x%08x," + " incremented ExpCmdSN to 0x%08x.\n", + cmd->cmd_sn, sess->exp_cmd_sn); + + iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); + + if (iscsit_execute_cmd(cmd, 1) < 0) + return -1; + + continue; + } + + return ooo_count; +} + +/* + * Called either: + * + * 1. With sess->cmdsn_lock held from iscsi_execute_ooo_cmdsns() + * or iscsi_check_received_cmdsn(). + * 2. With no locks held directly from iscsi_handle_XXX_pdu() functions + * for immediate commands. + */ +int iscsit_execute_cmd(struct iscsi_cmd *cmd, int ooo) +{ + struct se_cmd *se_cmd = &cmd->se_cmd; + int lr = 0; + + spin_lock_bh(&cmd->istate_lock); + if (ooo) + cmd->cmd_flags &= ~ICF_OOO_CMDSN; + + switch (cmd->iscsi_opcode) { + case ISCSI_OP_SCSI_CMD: + /* + * Go ahead and send the CHECK_CONDITION status for + * any SCSI CDB exceptions that may have occurred, also + * handle the SCF_SCSI_RESERVATION_CONFLICT case here as well. + */ + if (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION) { + if (se_cmd->se_cmd_flags & + SCF_SCSI_RESERVATION_CONFLICT) { + cmd->i_state = ISTATE_SEND_STATUS; + spin_unlock_bh(&cmd->istate_lock); + iscsit_add_cmd_to_response_queue(cmd, cmd->conn, + cmd->i_state); + return 0; + } + spin_unlock_bh(&cmd->istate_lock); + /* + * Determine if delayed TASK_ABORTED status for WRITEs + * should be sent now if no unsolicited data out + * payloads are expected, or if the delayed status + * should be sent after unsolicited data out with + * ISCSI_FLAG_CMD_FINAL set in iscsi_handle_data_out() + */ + if (transport_check_aborted_status(se_cmd, + (cmd->unsolicited_data == 0)) != 0) + return 0; + /* + * Otherwise send CHECK_CONDITION and sense for + * exception + */ + return transport_send_check_condition_and_sense(se_cmd, + se_cmd->scsi_sense_reason, 0); + } + /* + * Special case for delayed CmdSN with Immediate + * Data and/or Unsolicited Data Out attached. + */ + if (cmd->immediate_data) { + if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { + spin_unlock_bh(&cmd->istate_lock); + return transport_generic_handle_data( + &cmd->se_cmd); + } + spin_unlock_bh(&cmd->istate_lock); + + if (!(cmd->cmd_flags & + ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) { + /* + * Send the delayed TASK_ABORTED status for + * WRITEs if no more unsolicitied data is + * expected. + */ + if (transport_check_aborted_status(se_cmd, 1) + != 0) + return 0; + + iscsit_set_dataout_sequence_values(cmd); + iscsit_build_r2ts_for_cmd(cmd, cmd->conn, 0); + } + return 0; + } + /* + * The default handler. + */ + spin_unlock_bh(&cmd->istate_lock); + + if ((cmd->data_direction == DMA_TO_DEVICE) && + !(cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) { + /* + * Send the delayed TASK_ABORTED status for WRITEs if + * no more nsolicitied data is expected. + */ + if (transport_check_aborted_status(se_cmd, 1) != 0) + return 0; + + iscsit_set_dataout_sequence_values(cmd); + spin_lock_bh(&cmd->dataout_timeout_lock); + iscsit_start_dataout_timer(cmd, cmd->conn); + spin_unlock_bh(&cmd->dataout_timeout_lock); + } + return transport_generic_handle_cdb(&cmd->se_cmd); + + case ISCSI_OP_NOOP_OUT: + case ISCSI_OP_TEXT: + spin_unlock_bh(&cmd->istate_lock); + iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); + break; + case ISCSI_OP_SCSI_TMFUNC: + if (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION) { + spin_unlock_bh(&cmd->istate_lock); + iscsit_add_cmd_to_response_queue(cmd, cmd->conn, + cmd->i_state); + return 0; + } + spin_unlock_bh(&cmd->istate_lock); + + return transport_generic_handle_tmr(SE_CMD(cmd)); + case ISCSI_OP_LOGOUT: + spin_unlock_bh(&cmd->istate_lock); + switch (cmd->logout_reason) { + case ISCSI_LOGOUT_REASON_CLOSE_SESSION: + lr = iscsit_logout_closesession(cmd, cmd->conn); + break; + case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: + lr = iscsit_logout_closeconnection(cmd, cmd->conn); + break; + case ISCSI_LOGOUT_REASON_RECOVERY: + lr = iscsit_logout_removeconnforrecovery(cmd, cmd->conn); + break; + default: + printk(KERN_ERR "Unknown iSCSI Logout Request Code:" + " 0x%02x\n", cmd->logout_reason); + return -1; + } + + return lr; + default: + spin_unlock_bh(&cmd->istate_lock); + printk(KERN_ERR "Cannot perform out of order execution for" + " unknown iSCSI Opcode: 0x%02x\n", cmd->iscsi_opcode); + return -1; + } + + return 0; +} + +void iscsit_free_all_ooo_cmdsns(struct iscsi_session *sess) +{ + struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; + + spin_lock(&sess->cmdsn_lock); + list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, + &sess->sess_ooo_cmdsn_list, ooo_list) { + + list_del(&ooo_cmdsn->ooo_list); + kmem_cache_free(lio_ooo_cache, ooo_cmdsn); + } + spin_unlock(&sess->cmdsn_lock); +} + +int iscsit_handle_ooo_cmdsn( + struct iscsi_session *sess, + struct iscsi_cmd *cmd, + u32 cmdsn) +{ + int batch = 0; + struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL, *ooo_tail = NULL; + + sess->cmdsn_outoforder = 1; + + cmd->deferred_i_state = cmd->i_state; + cmd->i_state = ISTATE_DEFERRED_CMD; + cmd->cmd_flags |= ICF_OOO_CMDSN; + + if (list_empty(&sess->sess_ooo_cmdsn_list)) + batch = 1; + else { + ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev, + typeof(*ooo_tail), ooo_list); + if (ooo_tail->cmdsn != (cmdsn - 1)) + batch = 1; + } + + ooo_cmdsn = iscsit_allocate_ooo_cmdsn(); + if (!ooo_cmdsn) + return CMDSN_ERROR_CANNOT_RECOVER; + + ooo_cmdsn->cmd = cmd; + ooo_cmdsn->batch_count = (batch) ? + (cmdsn - sess->exp_cmd_sn) : 1; + ooo_cmdsn->cid = cmd->conn->cid; + ooo_cmdsn->exp_cmdsn = sess->exp_cmd_sn; + ooo_cmdsn->cmdsn = cmdsn; + + if (iscsit_attach_ooo_cmdsn(sess, ooo_cmdsn) < 0) { + kmem_cache_free(lio_ooo_cache, ooo_cmdsn); + return CMDSN_ERROR_CANNOT_RECOVER; + } + + return CMDSN_HIGHER_THAN_EXP; +} + +static int iscsit_set_dataout_timeout_values( + struct iscsi_cmd *cmd, + u32 *offset, + u32 *length) +{ + struct iscsi_conn *conn = cmd->conn; + struct iscsi_r2t *r2t; + + if (cmd->unsolicited_data) { + *offset = 0; + *length = (conn->sess->sess_ops->FirstBurstLength > + cmd->data_length) ? + cmd->data_length : + conn->sess->sess_ops->FirstBurstLength; + return 0; + } + + spin_lock_bh(&cmd->r2t_lock); + if (list_empty(&cmd->cmd_r2t_list)) { + printk(KERN_ERR "cmd->cmd_r2t_list is empty!\n"); + spin_unlock_bh(&cmd->r2t_lock); + return -1; + } + + list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) + if (r2t->sent_r2t && !r2t->recovery_r2t && !r2t->seq_complete) + break; + + if (!r2t) { + printk(KERN_ERR "Unable to locate any incomplete DataOUT" + " sequences for ITT: 0x%08x.\n", cmd->init_task_tag); + spin_unlock_bh(&cmd->r2t_lock); + return -1; + } + + *offset = r2t->offset; + *length = r2t->xfer_len; + + spin_unlock_bh(&cmd->r2t_lock); + return 0; +} + +/* + * NOTE: Called from interrupt (timer) context. + */ +static void iscsit_handle_dataout_timeout(unsigned long data) +{ + u32 pdu_length = 0, pdu_offset = 0; + u32 r2t_length = 0, r2t_offset = 0; + struct iscsi_cmd *cmd = (struct iscsi_cmd *) data; + struct iscsi_conn *conn = cmd->conn; + struct iscsi_session *sess = NULL; + struct iscsi_node_attrib *na; + + iscsit_inc_conn_usage_count(conn); + + spin_lock_bh(&cmd->dataout_timeout_lock); + if (cmd->dataout_timer_flags & ISCSI_TF_STOP) { + spin_unlock_bh(&cmd->dataout_timeout_lock); + iscsit_dec_conn_usage_count(conn); + return; + } + cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING; + sess = conn->sess; + na = iscsit_tpg_get_node_attrib(sess); + + if (!sess->sess_ops->ErrorRecoveryLevel) { + TRACE(TRACE_ERL0, "Unable to recover from DataOut timeout while" + " in ERL=0.\n"); + goto failure; + } + + if (++cmd->dataout_timeout_retries == na->dataout_timeout_retries) { + TRACE(TRACE_TIMER, "Command ITT: 0x%08x exceeded max retries" + " for DataOUT timeout %u, closing iSCSI connection.\n", + cmd->init_task_tag, na->dataout_timeout_retries); + goto failure; + } + + cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY; + + if (conn->sess->sess_ops->DataSequenceInOrder) { + if (conn->sess->sess_ops->DataPDUInOrder) { + pdu_offset = cmd->write_data_done; + if ((pdu_offset + (conn->sess->sess_ops->MaxBurstLength - + cmd->next_burst_len)) > cmd->data_length) + pdu_length = (cmd->data_length - + cmd->write_data_done); + else + pdu_length = (conn->sess->sess_ops->MaxBurstLength - + cmd->next_burst_len); + } else { + pdu_offset = cmd->seq_start_offset; + pdu_length = (cmd->seq_end_offset - + cmd->seq_start_offset); + } + } else { + if (iscsit_set_dataout_timeout_values(cmd, &pdu_offset, + &pdu_length) < 0) + goto failure; + } + + if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length, + &r2t_offset, &r2t_length) < 0) + goto failure; + + TRACE(TRACE_TIMER, "Command ITT: 0x%08x timed out waiting for" + " completion of %sDataOUT Sequence Offset: %u, Length: %u\n", + cmd->init_task_tag, (cmd->unsolicited_data) ? "Unsolicited " : + "", r2t_offset, r2t_length); + + if (iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length) < 0) + goto failure; + + iscsit_start_dataout_timer(cmd, conn); + spin_unlock_bh(&cmd->dataout_timeout_lock); + iscsit_dec_conn_usage_count(conn); + + return; + +failure: + spin_unlock_bh(&cmd->dataout_timeout_lock); + iscsit_cause_connection_reinstatement(conn, 0); + iscsit_dec_conn_usage_count(conn); + + return; +} + +void iscsit_mod_dataout_timer(struct iscsi_cmd *cmd) +{ + struct iscsi_conn *conn = cmd->conn; + struct iscsi_session *sess = conn->sess; + struct iscsi_node_attrib *na = na = iscsit_tpg_get_node_attrib(sess); + + spin_lock_bh(&cmd->dataout_timeout_lock); + if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) { + spin_unlock_bh(&cmd->dataout_timeout_lock); + return; + } + + mod_timer(&cmd->dataout_timer, + (get_jiffies_64() + na->dataout_timeout * HZ)); + TRACE(TRACE_TIMER, "Updated DataOUT timer for ITT: 0x%08x", + cmd->init_task_tag); + spin_unlock_bh(&cmd->dataout_timeout_lock); +} + +/* + * Called with cmd->dataout_timeout_lock held. + */ +void iscsit_start_dataout_timer( + struct iscsi_cmd *cmd, + struct iscsi_conn *conn) +{ + struct iscsi_session *sess = conn->sess; + struct iscsi_node_attrib *na = na = iscsit_tpg_get_node_attrib(sess); + + if (cmd->dataout_timer_flags & ISCSI_TF_RUNNING) + return; + + TRACE(TRACE_TIMER, "Starting DataOUT timer for ITT: 0x%08x on" + " CID: %hu.\n", cmd->init_task_tag, conn->cid); + + init_timer(&cmd->dataout_timer); + cmd->dataout_timer.expires = (get_jiffies_64() + na->dataout_timeout * HZ); + cmd->dataout_timer.data = (unsigned long)cmd; + cmd->dataout_timer.function = iscsit_handle_dataout_timeout; + cmd->dataout_timer_flags &= ~ISCSI_TF_STOP; + cmd->dataout_timer_flags |= ISCSI_TF_RUNNING; + add_timer(&cmd->dataout_timer); +} + +void iscsit_stop_dataout_timer(struct iscsi_cmd *cmd) +{ + spin_lock_bh(&cmd->dataout_timeout_lock); + if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) { + spin_unlock_bh(&cmd->dataout_timeout_lock); + return; + } + cmd->dataout_timer_flags |= ISCSI_TF_STOP; + spin_unlock_bh(&cmd->dataout_timeout_lock); + + del_timer_sync(&cmd->dataout_timer); + + spin_lock_bh(&cmd->dataout_timeout_lock); + cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING; + TRACE(TRACE_TIMER, "Stopped DataOUT Timer for ITT: 0x%08x\n", + cmd->init_task_tag); + spin_unlock_bh(&cmd->dataout_timeout_lock); +} diff --git a/drivers/target/iscsi/iscsi_target_erl1.h b/drivers/target/iscsi/iscsi_target_erl1.h new file mode 100644 index 0000000..3118a18 --- /dev/null +++ b/drivers/target/iscsi/iscsi_target_erl1.h @@ -0,0 +1,28 @@ +#ifndef ISCSI_TARGET_ERL1_H +#define ISCSI_TARGET_ERL1_H + +extern int iscsit_dump_data_payload(struct iscsi_conn *, u32, int); +extern int iscsit_create_recovery_datain_values_datasequenceinorder_yes( + struct iscsi_cmd *, struct iscsi_datain_req *); +extern int iscsit_create_recovery_datain_values_datasequenceinorder_no( + struct iscsi_cmd *, struct iscsi_datain_req *); +extern int iscsit_handle_recovery_datain_or_r2t(struct iscsi_conn *, unsigned char *, + u32, u32, u32, u32); +extern int iscsit_handle_status_snack(struct iscsi_conn *, u32, u32, + u32, u32); +extern int iscsit_handle_data_ack(struct iscsi_conn *, u32, u32, u32); +extern int iscsit_dataout_datapduinorder_no_fbit(struct iscsi_cmd *, struct iscsi_pdu *); +extern int iscsit_recover_dataout_sequence(struct iscsi_cmd *, u32, u32); +extern void iscsit_clear_ooo_cmdsns_for_conn(struct iscsi_conn *); +extern void iscsit_free_all_ooo_cmdsns(struct iscsi_session *); +extern int iscsit_execute_ooo_cmdsns(struct iscsi_session *); +extern int iscsit_execute_cmd(struct iscsi_cmd *, int); +extern int iscsit_handle_ooo_cmdsn(struct iscsi_session *, struct iscsi_cmd *, u32); +extern void iscsit_remove_ooo_cmdsn(struct iscsi_session *, struct iscsi_ooo_cmdsn *); +extern void iscsit_mod_dataout_timer(struct iscsi_cmd *); +extern void iscsit_start_dataout_timer(struct iscsi_cmd *, struct iscsi_conn *); +extern void iscsit_stop_dataout_timer(struct iscsi_cmd *); + +extern struct kmem_cache *lio_ooo_cache; + +#endif /* ISCSI_TARGET_ERL1_H */ diff --git a/drivers/target/iscsi/iscsi_target_erl2.c b/drivers/target/iscsi/iscsi_target_erl2.c new file mode 100644 index 0000000..a239a08 --- /dev/null +++ b/drivers/target/iscsi/iscsi_target_erl2.c @@ -0,0 +1,483 @@ +/******************************************************************************* + * This file contains error recovery level two functions used by + * the iSCSI Target driver. + * + * © Copyright 2007-2011 RisingTide Systems LLC. + * + * Licensed to the Linux Foundation under the General Public License (GPL) version 2. + * + * Author: Nicholas A. Bellinger <nab@xxxxxxxxxxxxxxx> + * + * 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_transport.h> + +#include "iscsi_target_debug.h" +#include "iscsi_target_core.h" +#include "iscsi_target_datain_values.h" +#include "iscsi_target_util.h" +#include "iscsi_target_erl0.h" +#include "iscsi_target_erl1.h" +#include "iscsi_target_erl2.h" +#include "iscsi_target.h" + +/* + * FIXME: Does RData SNACK apply here as well? + */ +void iscsit_create_conn_recovery_datain_values( + struct iscsi_cmd *cmd, + u32 exp_data_sn) +{ + u32 data_sn = 0; + struct iscsi_conn *conn = cmd->conn; + + cmd->next_burst_len = 0; + cmd->read_data_done = 0; + + while (exp_data_sn > data_sn) { + if ((cmd->next_burst_len + + conn->conn_ops->MaxRecvDataSegmentLength) < + conn->sess->sess_ops->MaxBurstLength) { + cmd->read_data_done += + conn->conn_ops->MaxRecvDataSegmentLength; + cmd->next_burst_len += + conn->conn_ops->MaxRecvDataSegmentLength; + } else { + cmd->read_data_done += + (conn->sess->sess_ops->MaxBurstLength - + cmd->next_burst_len); + cmd->next_burst_len = 0; + } + data_sn++; + } +} + +void iscsit_create_conn_recovery_dataout_values( + struct iscsi_cmd *cmd) +{ + u32 write_data_done = 0; + struct iscsi_conn *conn = cmd->conn; + + cmd->data_sn = 0; + cmd->next_burst_len = 0; + + while (cmd->write_data_done > write_data_done) { + if ((write_data_done + conn->sess->sess_ops->MaxBurstLength) <= + cmd->write_data_done) + write_data_done += conn->sess->sess_ops->MaxBurstLength; + else + break; + } + + cmd->write_data_done = write_data_done; +} + +static int iscsit_attach_active_connection_recovery_entry( + struct iscsi_session *sess, + struct iscsi_conn_recovery *cr) +{ + spin_lock(&sess->cr_a_lock); + list_add_tail(&cr->cr_list, &sess->cr_active_list); + spin_unlock(&sess->cr_a_lock); + + return 0; +} + +static int iscsit_attach_inactive_connection_recovery_entry( + struct iscsi_session *sess, + struct iscsi_conn_recovery *cr) +{ + spin_lock(&sess->cr_i_lock); + list_add_tail(&cr->cr_list, &sess->cr_inactive_list); + + sess->conn_recovery_count++; + TRACE(TRACE_ERL2, "Incremented connection recovery count to %u for" + " SID: %u\n", sess->conn_recovery_count, sess->sid); + spin_unlock(&sess->cr_i_lock); + + return 0; +} + +struct iscsi_conn_recovery *iscsit_get_inactive_connection_recovery_entry( + struct iscsi_session *sess, + u16 cid) +{ + struct iscsi_conn_recovery *cr; + + spin_lock(&sess->cr_i_lock); + list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) { + if (cr->cid == cid) + break; + } + spin_unlock(&sess->cr_i_lock); + + return (cr) ? cr : NULL; +} + +void iscsit_free_connection_recovery_entires(struct iscsi_session *sess) +{ + struct iscsi_cmd *cmd, *cmd_tmp; + struct iscsi_conn_recovery *cr, *cr_tmp; + + spin_lock(&sess->cr_a_lock); + list_for_each_entry_safe(cr, cr_tmp, &sess->cr_active_list, cr_list) { + list_del(&cr->cr_list); + spin_unlock(&sess->cr_a_lock); + + spin_lock(&cr->conn_recovery_cmd_lock); + list_for_each_entry_safe(cmd, cmd_tmp, + &cr->conn_recovery_cmd_list, i_list) { + + list_del(&cmd->i_list); + cmd->conn = NULL; + spin_unlock(&cr->conn_recovery_cmd_lock); + if (!(SE_CMD(cmd)) || + !(SE_CMD(cmd)->se_cmd_flags & SCF_SE_LUN_CMD) || + !(SE_CMD(cmd)->transport_wait_for_tasks)) + iscsit_release_cmd(cmd); + else + SE_CMD(cmd)->transport_wait_for_tasks( + SE_CMD(cmd), 1, 1); + spin_lock(&cr->conn_recovery_cmd_lock); + } + spin_unlock(&cr->conn_recovery_cmd_lock); + spin_lock(&sess->cr_a_lock); + + kfree(cr); + } + spin_unlock(&sess->cr_a_lock); + + spin_lock(&sess->cr_i_lock); + list_for_each_entry_safe(cr, cr_tmp, &sess->cr_inactive_list, cr_list) { + list_del(&cr->cr_list); + spin_unlock(&sess->cr_i_lock); + + spin_lock(&cr->conn_recovery_cmd_lock); + list_for_each_entry_safe(cmd, cmd_tmp, + &cr->conn_recovery_cmd_list, i_list) { + + list_del(&cmd->i_list); + cmd->conn = NULL; + spin_unlock(&cr->conn_recovery_cmd_lock); + if (!(SE_CMD(cmd)) || + !(SE_CMD(cmd)->se_cmd_flags & SCF_SE_LUN_CMD) || + !(SE_CMD(cmd)->transport_wait_for_tasks)) + iscsit_release_cmd(cmd); + else + SE_CMD(cmd)->transport_wait_for_tasks( + SE_CMD(cmd), 1, 1); + spin_lock(&cr->conn_recovery_cmd_lock); + } + spin_unlock(&cr->conn_recovery_cmd_lock); + spin_lock(&sess->cr_i_lock); + + kfree(cr); + } + spin_unlock(&sess->cr_i_lock); +} + +int iscsit_remove_active_connection_recovery_entry( + struct iscsi_conn_recovery *cr, + struct iscsi_session *sess) +{ + spin_lock(&sess->cr_a_lock); + list_del(&cr->cr_list); + + sess->conn_recovery_count--; + TRACE(TRACE_ERL2, "Decremented connection recovery count to %u for" + " SID: %u\n", sess->conn_recovery_count, sess->sid); + spin_unlock(&sess->cr_a_lock); + + kfree(cr); + + return 0; +} + +int iscsit_remove_inactive_connection_recovery_entry( + struct iscsi_conn_recovery *cr, + struct iscsi_session *sess) +{ + spin_lock(&sess->cr_i_lock); + list_del(&cr->cr_list); + spin_unlock(&sess->cr_i_lock); + + return 0; +} + +/* + * Called with cr->conn_recovery_cmd_lock help. + */ +int iscsit_remove_cmd_from_connection_recovery( + struct iscsi_cmd *cmd, + struct iscsi_session *sess) +{ + struct iscsi_conn_recovery *cr; + + if (!cmd->cr) { + printk(KERN_ERR "struct iscsi_conn_recovery pointer for ITT: 0x%08x" + " is NULL!\n", cmd->init_task_tag); + BUG(); + } + cr = cmd->cr; + + list_del(&cmd->i_list); + return --cr->cmd_count; +} + +void iscsit_discard_cr_cmds_by_expstatsn( + struct iscsi_conn_recovery *cr, + u32 exp_statsn) +{ + u32 dropped_count = 0; + struct iscsi_cmd *cmd, *cmd_tmp; + struct iscsi_session *sess = cr->sess; + + spin_lock(&cr->conn_recovery_cmd_lock); + list_for_each_entry_safe(cmd, cmd_tmp, + &cr->conn_recovery_cmd_list, i_list) { + + if (((cmd->deferred_i_state != ISTATE_SENT_STATUS) && + (cmd->deferred_i_state != ISTATE_REMOVE)) || + (cmd->stat_sn >= exp_statsn)) { + continue; + } + + dropped_count++; + TRACE(TRACE_ERL2, "Dropping Acknowledged ITT: 0x%08x, StatSN:" + " 0x%08x, CID: %hu.\n", cmd->init_task_tag, + cmd->stat_sn, cr->cid); + + iscsit_remove_cmd_from_connection_recovery(cmd, sess); + + spin_unlock(&cr->conn_recovery_cmd_lock); + if (!(SE_CMD(cmd)) || + !(SE_CMD(cmd)->se_cmd_flags & SCF_SE_LUN_CMD) || + !(SE_CMD(cmd)->transport_wait_for_tasks)) + iscsit_release_cmd(cmd); + else + SE_CMD(cmd)->transport_wait_for_tasks( + SE_CMD(cmd), 1, 0); + spin_lock(&cr->conn_recovery_cmd_lock); + } + spin_unlock(&cr->conn_recovery_cmd_lock); + + TRACE(TRACE_ERL2, "Dropped %u total acknowledged commands on" + " CID: %hu less than old ExpStatSN: 0x%08x\n", + dropped_count, cr->cid, exp_statsn); + + if (!cr->cmd_count) { + TRACE(TRACE_ERL2, "No commands to be reassigned for failed" + " connection CID: %hu on SID: %u\n", + cr->cid, sess->sid); + iscsit_remove_inactive_connection_recovery_entry(cr, sess); + iscsit_attach_active_connection_recovery_entry(sess, cr); + printk(KERN_INFO "iSCSI connection recovery successful for CID:" + " %hu on SID: %u\n", cr->cid, sess->sid); + iscsit_remove_active_connection_recovery_entry(cr, sess); + } else { + iscsit_remove_inactive_connection_recovery_entry(cr, sess); + iscsit_attach_active_connection_recovery_entry(sess, cr); + } + + return; +} + +int iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(struct iscsi_conn *conn) +{ + u32 dropped_count = 0; + struct iscsi_cmd *cmd, *cmd_tmp; + struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; + struct iscsi_session *sess = conn->sess; + + spin_lock(&sess->cmdsn_lock); + list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, + &sess->sess_ooo_cmdsn_list, ooo_list) { + + if (ooo_cmdsn->cid != conn->cid) + continue; + + dropped_count++; + TRACE(TRACE_ERL2, "Dropping unacknowledged CmdSN:" + " 0x%08x during connection recovery on CID: %hu\n", + ooo_cmdsn->cmdsn, conn->cid); + iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); + } + conn->sess->ooo_cmdsn_count -= dropped_count; + spin_unlock(&sess->cmdsn_lock); + + spin_lock_bh(&conn->cmd_lock); + list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) { + if (!(cmd->cmd_flags & ICF_OOO_CMDSN)) + continue; + + list_del(&cmd->i_list); + + spin_unlock_bh(&conn->cmd_lock); + if (!(SE_CMD(cmd)) || + !(SE_CMD(cmd)->se_cmd_flags & SCF_SE_LUN_CMD) || + !(SE_CMD(cmd)->transport_wait_for_tasks)) + iscsit_release_cmd(cmd); + else + SE_CMD(cmd)->transport_wait_for_tasks( + SE_CMD(cmd), 1, 1); + spin_lock_bh(&conn->cmd_lock); + } + spin_unlock_bh(&conn->cmd_lock); + + TRACE(TRACE_ERL2, "Dropped %u total unacknowledged commands on CID:" + " %hu for ExpCmdSN: 0x%08x.\n", dropped_count, conn->cid, + sess->exp_cmd_sn); + return 0; +} + +int iscsit_prepare_cmds_for_realligance(struct iscsi_conn *conn) +{ + u32 cmd_count = 0; + struct iscsi_cmd *cmd, *cmd_tmp; + struct iscsi_conn_recovery *cr; + + /* + * Allocate an struct iscsi_conn_recovery for this connection. + * Each struct iscsi_cmd contains an struct iscsi_conn_recovery pointer + * (struct iscsi_cmd->cr) so we need to allocate this before preparing the + * connection's command list for connection recovery. + */ + cr = kzalloc(sizeof(struct iscsi_conn_recovery), GFP_KERNEL); + if (!cr) { + printk(KERN_ERR "Unable to allocate memory for" + " struct iscsi_conn_recovery.\n"); + return -1; + } + INIT_LIST_HEAD(&cr->cr_list); + INIT_LIST_HEAD(&cr->conn_recovery_cmd_list); + spin_lock_init(&cr->conn_recovery_cmd_lock); + /* + * Only perform connection recovery on ISCSI_OP_SCSI_CMD or + * ISCSI_OP_NOOP_OUT opcodes. For all other opcodes call + * list_del(&cmd->i_list); to release the command to the + * session pool and remove it from the connection's list. + * + * Also stop the DataOUT timer, which will be restarted after + * sending the TMR response. + */ + spin_lock_bh(&conn->cmd_lock); + list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) { + + if ((cmd->iscsi_opcode != ISCSI_OP_SCSI_CMD) && + (cmd->iscsi_opcode != ISCSI_OP_NOOP_OUT)) { + TRACE(TRACE_ERL2, "Not performing realligence on" + " Opcode: 0x%02x, ITT: 0x%08x, CmdSN: 0x%08x," + " CID: %hu\n", cmd->iscsi_opcode, + cmd->init_task_tag, cmd->cmd_sn, conn->cid); + + list_del(&cmd->i_list); + spin_unlock_bh(&conn->cmd_lock); + + if (!(SE_CMD(cmd)) || + !(SE_CMD(cmd)->se_cmd_flags & SCF_SE_LUN_CMD) || + !(SE_CMD(cmd)->transport_wait_for_tasks)) + iscsit_release_cmd(cmd); + else + SE_CMD(cmd)->transport_wait_for_tasks( + SE_CMD(cmd), 1, 0); + spin_lock_bh(&conn->cmd_lock); + continue; + } + + /* + * Special case where commands greater than or equal to + * the session's ExpCmdSN are attached to the connection + * list but not to the out of order CmdSN list. The one + * obvious case is when a command with immediate data + * attached must only check the CmdSN against ExpCmdSN + * after the data is received. The special case below + * is when the connection fails before data is received, + * but also may apply to other PDUs, so it has been + * made generic here. + */ + if (!(cmd->cmd_flags & ICF_OOO_CMDSN) && !cmd->immediate_cmd && + (cmd->cmd_sn >= conn->sess->exp_cmd_sn)) { + list_del(&cmd->i_list); + spin_unlock_bh(&conn->cmd_lock); + + if (!(SE_CMD(cmd)) || + !(SE_CMD(cmd)->se_cmd_flags & SCF_SE_LUN_CMD) || + !(SE_CMD(cmd)->transport_wait_for_tasks)) + iscsit_release_cmd(cmd); + else + SE_CMD(cmd)->transport_wait_for_tasks( + SE_CMD(cmd), 1, 1); + spin_lock_bh(&conn->cmd_lock); + continue; + } + + cmd_count++; + TRACE(TRACE_ERL2, "Preparing Opcode: 0x%02x, ITT: 0x%08x," + " CmdSN: 0x%08x, StatSN: 0x%08x, CID: %hu for" + " realligence.\n", cmd->iscsi_opcode, + cmd->init_task_tag, cmd->cmd_sn, cmd->stat_sn, + conn->cid); + + cmd->deferred_i_state = cmd->i_state; + cmd->i_state = ISTATE_IN_CONNECTION_RECOVERY; + + if (cmd->data_direction == DMA_TO_DEVICE) + iscsit_stop_dataout_timer(cmd); + + cmd->sess = conn->sess; + + list_del(&cmd->i_list); + spin_unlock_bh(&conn->cmd_lock); + + iscsit_free_all_datain_reqs(cmd); + + if ((SE_CMD(cmd)) && + (SE_CMD(cmd)->se_cmd_flags & SCF_SE_LUN_CMD) && + SE_CMD(cmd)->transport_wait_for_tasks) + SE_CMD(cmd)->transport_wait_for_tasks(SE_CMD(cmd), + 0, 0); + /* + * Add the struct iscsi_cmd to the connection recovery cmd list + */ + spin_lock(&cr->conn_recovery_cmd_lock); + list_add_tail(&cmd->i_list, &cr->conn_recovery_cmd_list); + spin_unlock(&cr->conn_recovery_cmd_lock); + + spin_lock_bh(&conn->cmd_lock); + cmd->cr = cr; + cmd->conn = NULL; + } + spin_unlock_bh(&conn->cmd_lock); + /* + * Fill in the various values in the preallocated struct iscsi_conn_recovery. + */ + cr->cid = conn->cid; + cr->cmd_count = cmd_count; + cr->maxrecvdatasegmentlength = conn->conn_ops->MaxRecvDataSegmentLength; + cr->sess = conn->sess; + + iscsit_attach_inactive_connection_recovery_entry(conn->sess, cr); + + return 0; +} + +int iscsit_connection_recovery_transport_reset(struct iscsi_conn *conn) +{ + atomic_set(&conn->connection_recovery, 1); + + if (iscsit_close_connection(conn) < 0) + return -1; + + return 0; +} diff --git a/drivers/target/iscsi/iscsi_target_erl2.h b/drivers/target/iscsi/iscsi_target_erl2.h new file mode 100644 index 0000000..22f8d24 --- /dev/null +++ b/drivers/target/iscsi/iscsi_target_erl2.h @@ -0,0 +1,18 @@ +#ifndef ISCSI_TARGET_ERL2_H +#define ISCSI_TARGET_ERL2_H + +extern void iscsit_create_conn_recovery_datain_values(struct iscsi_cmd *, u32); +extern void iscsit_create_conn_recovery_dataout_values(struct iscsi_cmd *); +extern struct iscsi_conn_recovery *iscsit_get_inactive_connection_recovery_entry( + struct iscsi_session *, u16); +extern void iscsit_free_connection_recovery_entires(struct iscsi_session *); +extern int iscsit_remove_active_connection_recovery_entry( + struct iscsi_conn_recovery *, struct iscsi_session *); +extern int iscsit_remove_cmd_from_connection_recovery(struct iscsi_cmd *, + struct iscsi_session *); +extern void iscsit_discard_cr_cmds_by_expstatsn(struct iscsi_conn_recovery *, u32); +extern int iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(struct iscsi_conn *); +extern int iscsit_prepare_cmds_for_realligance(struct iscsi_conn *); +extern int iscsit_connection_recovery_transport_reset(struct iscsi_conn *); + +#endif /*** ISCSI_TARGET_ERL2_H ***/ -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html