Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752061Ab1CTJdE (ORCPT ); Sun, 20 Mar 2011 05:33:04 -0400 Received: from nm8-vm0.bullet.mail.sp2.yahoo.com ([98.139.91.194]:32394 "HELO nm8-vm0.bullet.mail.sp2.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752036Ab1CTJc6 (ORCPT ); Sun, 20 Mar 2011 05:32:58 -0400 X-Yahoo-Newman-Id: 929477.47871.bm@omp1040.mail.sp2.yahoo.com X-Yahoo-SMTP: fzDSGlOswBCWnIOrNw7KwwK1j9PqyNbe5PtLKiS4dDU.UNl_t6bdEZu9tTLW X-YMail-OSG: HiIcaYcVM1keBjX6nA8Mtq3ZvR.R8VoElbhJQFyRJFCOFcf 4BW9FMPnJY0Em1N2HWbuLHOKBeqy4R3KVadsPIvYhT4OIBdcoX.lmQTu.JLA 7DpBTgjr3ytniMs016bQXdUXDorxpYbTOhrSMKbEhHmMYYFk88JY5Aq_QsR0 G4i4zMmjUfpo6wp3sGDvZ2oG3qNBOzxXnWkOcnOihL6e_ShWHrnySSMOJlA5 rCf3cnJN4MORqYPCzuEOu149HOjR3DGhe7RKKU2_7nhMWdTOBon3sfxlpwID 0Ja.FATrGp9hjcsj9DPhwpCIKaMsduFOC2AWWUONESvhJvz8UZ0zw0YFhZHK 23VyGH60TTdCriWa3Fc0fAaty8KmE9ParMiyow3EYMyo8D2bLY17KRzuo52J 9ab75feP4tw6FEgtEkaIMehxI228- X-Yahoo-Newman-Property: ymail-3 From: "Nicholas A. Bellinger" To: linux-scsi , linux-kernel , James Bottomley Cc: Christoph Hellwig , Mike Christie , Hannes Reinecke , FUJITA Tomonori , Boaz Harrosh , Stephen Rothwell , Andrew Morton , Douglas Gilbert , Jesper Juhl , Nicholas Bellinger Subject: [RFC-v4 11/12] iscsi-target: Add misc utility and debug logic Date: Sun, 20 Mar 2011 02:31:36 -0700 Message-Id: <1300613497-2091-12-git-send-email-nab@linux-iscsi.org> X-Mailer: git-send-email 1.5.6.5 In-Reply-To: <1300613497-2091-1-git-send-email-nab@linux-iscsi.org> References: <1300613497-2091-1-git-send-email-nab@linux-iscsi.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 78759 Lines: 2809 From: Nicholas Bellinger This file adds iscsi_target_util.[c,h] code containing a number of miscellaneous utility functions for iscsi_target_mod including the following: *) wrappers to TCM logic from iscsi_target.c for struct iscsi_cmd allocation *) received iSCSI Command Sequence Number (CmdSN) processing *) Code for immediate / TX queues *) Nopin Response + Response Timeout handlers *) Primary sock_sendmsg() and sock_recvmsg() calls into Linux/Net *) iSCSI SendTargets It also contains iscsi_debug.h macros for CONFIG_ISCSI_TARGET_DEBUG Signed-off-by: Nicholas A. Bellinger --- drivers/target/iscsi/iscsi_target_debug.h | 113 ++ drivers/target/iscsi/iscsi_target_util.c | 2526 +++++++++++++++++++++++++++++ drivers/target/iscsi/iscsi_target_util.h | 118 ++ 3 files changed, 2757 insertions(+), 0 deletions(-) create mode 100644 drivers/target/iscsi/iscsi_target_debug.h create mode 100644 drivers/target/iscsi/iscsi_target_util.c create mode 100644 drivers/target/iscsi/iscsi_target_util.h diff --git a/drivers/target/iscsi/iscsi_target_debug.h b/drivers/target/iscsi/iscsi_target_debug.h new file mode 100644 index 0000000..1356146 --- /dev/null +++ b/drivers/target/iscsi/iscsi_target_debug.h @@ -0,0 +1,113 @@ +#ifndef ISCSI_DEBUG_H +#define ISCSI_DEBUG_H + +/* + * Debugging Support + */ + +#define TRACE_DEBUG 0x00000001 /* Verbose debugging */ +#define TRACE_SCSI 0x00000002 /* Stuff related to SCSI Mid-layer */ +#define TRACE_ISCSI 0x00000004 /* Stuff related to iSCSI */ +#define TRACE_NET 0x00000008 /* Stuff related to network code */ +#define TRACE_BUFF 0x00000010 /* For dumping raw data */ +#define TRACE_FILE 0x00000020 /* Used for __FILE__ */ +#define TRACE_LINE 0x00000040 /* Used for __LINE__ */ +#define TRACE_FUNCTION 0x00000080 /* Used for __FUNCTION__ */ +#define TRACE_SEM 0x00000100 /* Stuff related to semaphores */ +#define TRACE_ENTER_LEAVE 0x00000200 /* For entering/leaving functions */ +#define TRACE_DIGEST 0x00000400 /* For Header/Data Digests */ +#define TRACE_PARAM 0x00000800 /* For parameters in parameters.c */ +#define TRACE_LOGIN 0x00001000 /* For login related code */ +#define TRACE_STATE 0x00002000 /* For conn/sess/cleanup states */ +#define TRACE_ERL0 0x00004000 /* For ErrorRecoveryLevel=0 */ +#define TRACE_ERL1 0x00008000 /* For ErrorRecoveryLevel=1 */ +#define TRACE_ERL2 0x00010000 /* For ErrorRecoveryLevel=2 */ +#define TRACE_TIMER 0x00020000 /* For various ERL timers */ +#define TRACE_R2T 0x00040000 /* For R2T callers */ +#define TRACE_SPINDLE 0x00080000 /* For Spindle callers */ +#define TRACE_SSLR 0x00100000 /* For SyncNSteering RX */ +#define TRACE_SSLT 0x00200000 /* For SyncNSteering TX */ +#define TRACE_CHANNEL 0x00400000 /* For SCSI Channels */ +#define TRACE_CMDSN 0x00800000 /* For Out of Order CmdSN execution */ +#define TRACE_NODEATTRIB 0x01000000 /* For Initiator Nodes */ + +#define TRACE_VANITY 0x80000000 /* For all Vanity Noise */ +#define TRACE_ALL 0xffffffff /* Turn on all flags */ +#define TRACE_ENDING 0x00000000 /* foo */ + +#ifdef CONFIG_ISCSI_TARGET_DEBUG +/* + * TRACE_VANITY, is always last! + */ +static unsigned int iscsi_trace = +/* TRACE_DEBUG | */ +/* TRACE_SCSI | */ +/* TRACE_ISCSI | */ +/* TRACE_NET | */ +/* TRACE_BUFF | */ +/* TRACE_FILE | */ +/* TRACE_LINE | */ +/* TRACE_FUNCTION | */ +/* TRACE_SEM | */ + +/* TRACE_DIGEST | */ +/* TRACE_PARAM | */ +/* TRACE_LOGIN | */ +/* TRACE_STATE | */ + TRACE_ERL0 | + TRACE_ERL1 | + TRACE_ERL2 | +/* TRACE_TIMER | */ +/* TRACE_R2T | */ +/* TRACE_SPINDLE | */ +/* TRACE_SSLR | */ +/* TRACE_SSLT | */ +/* TRACE_CHANNEL | */ +/* TRACE_CMDSN | */ +/* TRACE_NODEATTRIB | */ + TRACE_VANITY | + TRACE_ENDING; + +#define TRACE(trace, args...) \ +{ \ +static char iscsi_trace_buff[256]; \ + \ +if (iscsi_trace & trace) { \ + sprintf(iscsi_trace_buff, args); \ + if (iscsi_trace & TRACE_FUNCTION) { \ + printk(KERN_INFO "%s:%d: %s", __func__, __LINE__, \ + iscsi_trace_buff); \ + } else if (iscsi_trace&TRACE_FILE) { \ + printk(KERN_INFO "%s::%d: %s", __FILE__, __LINE__, \ + iscsi_trace_buff); \ + } else if (iscsi_trace & TRACE_LINE) { \ + printk(KERN_INFO "%d: %s", __LINE__, iscsi_trace_buff); \ + } else { \ + printk(KERN_INFO "%s", iscsi_trace_buff); \ + } \ +} \ +} + +#define PRINT_BUFF(buff, len) \ +if (iscsi_trace & TRACE_BUFF) { \ + int zzz; \ + \ + printk(KERN_INFO "%d:\n", __LINE__); \ + for (zzz = 0; zzz < len; zzz++) { \ + if (zzz % 16 == 0) { \ + if (zzz) \ + printk(KERN_INFO "\n"); \ + printk(KERN_INFO "%4i: ", zzz); \ + } \ + printk(KERN_INFO "%02x ", (unsigned char) (buff)[zzz]); \ + } \ + if ((len + 1) % 16) \ + printk(KERN_INFO "\n"); \ +} + +#else /* !CONFIG_ISCSI_TARGET_DEBUG */ +#define TRACE(trace, args...) +#define PRINT_BUFF(buff, len) +#endif /* CONFIG_ISCSI_TARGET_DEBUG */ + +#endif /*** ISCSI_DEBUG_H ***/ diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c new file mode 100644 index 0000000..9fd7a39 --- /dev/null +++ b/drivers/target/iscsi/iscsi_target_util.c @@ -0,0 +1,2526 @@ +/******************************************************************************* + * This file contains the iSCSI Target specific utility functions. + * + * © Copyright 2007-2011 RisingTide Systems LLC. + * + * Licensed to the Linux Foundation under the General Public License (GPL) version 2. + * + * Author: Nicholas A. Bellinger + * + * 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 +#include /* For TASK_ATTR_* */ +#include +#include +#include +#include +#include +#include + +#include "iscsi_target_debug.h" +#include "iscsi_target_core.h" +#include "iscsi_target_parameters.h" +#include "iscsi_target_seq_pdu_list.h" +#include "iscsi_target_datain_values.h" +#include "iscsi_target_erl0.h" +#include "iscsi_target_erl1.h" +#include "iscsi_target_erl2.h" +#include "iscsi_target_tpg.h" +#include "iscsi_target_tq.h" +#include "iscsi_target_util.h" +#include "iscsi_target.h" + +extern struct list_head g_tiqn_list; +extern spinlock_t tiqn_lock; + +/* + * Called with cmd->r2t_lock held. + */ +int iscsit_add_r2t_to_list( + struct iscsi_cmd *cmd, + u32 offset, + u32 xfer_len, + int recovery, + u32 r2t_sn) +{ + struct iscsi_r2t *r2t; + + r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC); + if (!r2t) { + printk(KERN_ERR "Unable to allocate memory for struct iscsi_r2t.\n"); + return -1; + } + INIT_LIST_HEAD(&r2t->r2t_list); + + r2t->recovery_r2t = recovery; + r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn; + r2t->offset = offset; + r2t->xfer_len = xfer_len; + list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list); + spin_unlock_bh(&cmd->r2t_lock); + + iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T); + + spin_lock_bh(&cmd->r2t_lock); + return 0; +} + +struct iscsi_r2t *iscsit_get_r2t_for_eos( + struct iscsi_cmd *cmd, + u32 offset, + u32 length) +{ + struct iscsi_r2t *r2t; + + spin_lock_bh(&cmd->r2t_lock); + list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { + if ((r2t->offset <= offset) && + (r2t->offset + r2t->xfer_len) >= (offset + length)) + break; + } + spin_unlock_bh(&cmd->r2t_lock); + + if (!r2t) { + printk(KERN_ERR "Unable to locate R2T for Offset: %u, Length:" + " %u\n", offset, length); + return NULL; + } + + return r2t; +} + +struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd) +{ + struct iscsi_r2t *r2t; + + spin_lock_bh(&cmd->r2t_lock); + list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { + if (!r2t->sent_r2t) + break; + } + spin_unlock_bh(&cmd->r2t_lock); + + if (!r2t) { + printk(KERN_ERR "Unable to locate next R2T to send for ITT:" + " 0x%08x.\n", cmd->init_task_tag); + return NULL; + } + + return r2t; +} + +/* + * Called with cmd->r2t_lock held. + */ +void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd) +{ + list_del(&r2t->r2t_list); + kmem_cache_free(lio_r2t_cache, r2t); +} + +void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd) +{ + struct iscsi_r2t *r2t, *r2t_tmp; + + spin_lock_bh(&cmd->r2t_lock); + list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list) { + list_del(&r2t->r2t_list); + kmem_cache_free(lio_r2t_cache, r2t); + } + spin_unlock_bh(&cmd->r2t_lock); +} + +/* + * May be called from interrupt context. + */ +struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn) +{ + struct iscsi_cmd *cmd; + + cmd = kmem_cache_zalloc(lio_cmd_cache, GFP_ATOMIC); + if (!cmd) { + printk(KERN_ERR "Unable to allocate memory for struct iscsi_cmd.\n"); + return NULL; + } + + cmd->conn = conn; + INIT_LIST_HEAD(&cmd->i_list); + INIT_LIST_HEAD(&cmd->datain_list); + INIT_LIST_HEAD(&cmd->cmd_r2t_list); + init_completion(&cmd->reject_comp); + init_completion(&cmd->unsolicited_data_comp); + spin_lock_init(&cmd->datain_lock); + spin_lock_init(&cmd->dataout_timeout_lock); + spin_lock_init(&cmd->istate_lock); + spin_lock_init(&cmd->error_lock); + spin_lock_init(&cmd->r2t_lock); + + return cmd; +} + +/* + * Called from iscsi_handle_scsi_cmd() + */ +struct iscsi_cmd *iscsit_allocate_se_cmd( + struct iscsi_conn *conn, + u32 data_length, + int data_direction, + int iscsi_task_attr) +{ + struct iscsi_cmd *cmd; + struct se_cmd *se_cmd; + int sam_task_attr; + + cmd = iscsit_allocate_cmd(conn); + if (!cmd) + return NULL; + + cmd->data_direction = data_direction; + cmd->data_length = data_length; + /* + * Figure out the SAM Task Attribute for the incoming SCSI CDB + */ + if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || + (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) + sam_task_attr = TASK_ATTR_SIMPLE; + else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) + sam_task_attr = TASK_ATTR_ORDERED; + else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) + sam_task_attr = TASK_ATTR_HOQ; + else if (iscsi_task_attr == ISCSI_ATTR_ACA) + sam_task_attr = TASK_ATTR_ACA; + else { + printk(KERN_INFO "Unknown iSCSI Task Attribute: 0x%02x, using" + " TASK_ATTR_SIMPLE\n", iscsi_task_attr); + sam_task_attr = TASK_ATTR_SIMPLE; + } + + se_cmd = &cmd->se_cmd; + /* + * Initialize struct se_cmd descriptor from target_core_mod infrastructure + */ + transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops, + conn->sess->se_sess, data_length, data_direction, + sam_task_attr, &cmd->sense_buffer[0]); + return cmd; +} + +struct iscsi_cmd *iscsit_allocate_se_cmd_for_tmr( + struct iscsi_conn *conn, + u8 function) +{ + struct iscsi_cmd *cmd; + struct se_cmd *se_cmd; + u8 tcm_function; + + cmd = iscsit_allocate_cmd(conn); + if (!cmd) + return NULL; + + cmd->data_direction = DMA_NONE; + + cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL); + if (!cmd->tmr_req) { + printk(KERN_ERR "Unable to allocate memory for" + " Task Management command!\n"); + return NULL; + } + /* + * TASK_REASSIGN for ERL=2 / connection stays inside of + * LIO-Target $FABRIC_MOD + */ + if (function == ISCSI_TM_FUNC_TASK_REASSIGN) + return cmd; + + se_cmd = &cmd->se_cmd; + /* + * Initialize struct se_cmd descriptor from target_core_mod infrastructure + */ + transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops, + conn->sess->se_sess, 0, DMA_NONE, + TASK_ATTR_SIMPLE, &cmd->sense_buffer[0]); + + switch (function) { + case ISCSI_TM_FUNC_ABORT_TASK: + tcm_function = TMR_ABORT_TASK; + break; + case ISCSI_TM_FUNC_ABORT_TASK_SET: + tcm_function = TMR_ABORT_TASK_SET; + break; + case ISCSI_TM_FUNC_CLEAR_ACA: + tcm_function = TMR_CLEAR_ACA; + break; + case ISCSI_TM_FUNC_CLEAR_TASK_SET: + tcm_function = TMR_CLEAR_TASK_SET; + break; + case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: + tcm_function = TMR_LUN_RESET; + break; + case ISCSI_TM_FUNC_TARGET_WARM_RESET: + tcm_function = TMR_TARGET_WARM_RESET; + break; + case ISCSI_TM_FUNC_TARGET_COLD_RESET: + tcm_function = TMR_TARGET_COLD_RESET; + break; + default: + printk(KERN_ERR "Unknown iSCSI TMR Function:" + " 0x%02x\n", function); + goto out; + } + + se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd, + (void *)cmd->tmr_req, tcm_function); + if (!se_cmd->se_tmr_req) + goto out; + + cmd->tmr_req->se_tmr_req = se_cmd->se_tmr_req; + + return cmd; +out: + iscsit_release_cmd_to_pool(cmd); + if (se_cmd) + transport_free_se_cmd(se_cmd); + return NULL; +} + +int iscsit_decide_list_to_build( + struct iscsi_cmd *cmd, + u32 immediate_data_length) +{ + struct iscsi_build_list bl; + struct iscsi_conn *conn = cmd->conn; + struct iscsi_session *sess = conn->sess; + struct iscsi_node_attrib *na; + + if (sess->sess_ops->DataSequenceInOrder && + sess->sess_ops->DataPDUInOrder) + return 0; + + if (cmd->data_direction == DMA_NONE) + return 0; + + na = iscsit_tpg_get_node_attrib(sess); + memset(&bl, 0, sizeof(struct iscsi_build_list)); + + if (cmd->data_direction == DMA_FROM_DEVICE) { + bl.data_direction = ISCSI_PDU_READ; + bl.type = PDULIST_NORMAL; + if (na->random_datain_pdu_offsets) + bl.randomize |= RANDOM_DATAIN_PDU_OFFSETS; + if (na->random_datain_seq_offsets) + bl.randomize |= RANDOM_DATAIN_SEQ_OFFSETS; + } else { + bl.data_direction = ISCSI_PDU_WRITE; + bl.immediate_data_length = immediate_data_length; + if (na->random_r2t_offsets) + bl.randomize |= RANDOM_R2T_OFFSETS; + + if (!cmd->immediate_data && !cmd->unsolicited_data) + bl.type = PDULIST_NORMAL; + else if (cmd->immediate_data && !cmd->unsolicited_data) + bl.type = PDULIST_IMMEDIATE; + else if (!cmd->immediate_data && cmd->unsolicited_data) + bl.type = PDULIST_UNSOLICITED; + else if (cmd->immediate_data && cmd->unsolicited_data) + bl.type = PDULIST_IMMEDIATE_AND_UNSOLICITED; + } + + return iscsit_do_build_list(cmd, &bl); +} + +struct iscsi_seq *iscsit_get_seq_holder_for_datain( + struct iscsi_cmd *cmd, + u32 seq_send_order) +{ + u32 i; + + for (i = 0; i < cmd->seq_count; i++) + if (cmd->seq_list[i].seq_send_order == seq_send_order) + return &cmd->seq_list[i]; + + return NULL; +} + +struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd) +{ + u32 i; + + if (!cmd->seq_list) { + printk(KERN_ERR "struct iscsi_cmd->seq_list is NULL!\n"); + return NULL; + } + + for (i = 0; i < cmd->seq_count; i++) { + if (cmd->seq_list[i].type != SEQTYPE_NORMAL) + continue; + if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) { + cmd->seq_send_order++; + return &cmd->seq_list[i]; + } + } + + return NULL; +} + +struct iscsi_r2t *iscsit_get_holder_for_r2tsn( + struct iscsi_cmd *cmd, + u32 r2t_sn) +{ + struct iscsi_r2t *r2t; + + spin_lock_bh(&cmd->r2t_lock); + list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { + if (r2t->r2t_sn == r2t_sn) + break; + } + spin_unlock_bh(&cmd->r2t_lock); + + return (r2t) ? r2t : NULL; +} + +#define SERIAL_BITS 31 +#define MAX_BOUND (u32)2147483647UL + +static inline int serial_lt(u32 x, u32 y) +{ + return (x != y) && (((x < y) && ((y - x) < MAX_BOUND)) || + ((x > y) && ((x - y) > MAX_BOUND))); +} + +static inline int serial_lte(u32 x, u32 y) +{ + return (x == y) ? 1 : serial_lt(x, y); +} + +static inline int serial_gt(u32 x, u32 y) +{ + return (x != y) && (((x < y) && ((y - x) > MAX_BOUND)) || + ((x > y) && ((x - y) < MAX_BOUND))); +} + +static inline int serial_gte(u32 x, u32 y) +{ + return (x == y) ? 1 : serial_gt(x, y); +} + +inline int iscsit_check_received_cmdsn( + struct iscsi_conn *conn, + struct iscsi_cmd *cmd, + u32 cmdsn) +{ + int ret; + /* + * This is the proper method of checking received CmdSN against + * ExpCmdSN and MaxCmdSN values, as well as accounting for out + * or order CmdSNs due to multiple connection sessions and/or + * CRC failures. + */ + spin_lock(&conn->sess->cmdsn_lock); + if (serial_gt(cmdsn, conn->sess->max_cmd_sn)) { + printk(KERN_ERR "Received CmdSN: 0x%08x is greater than" + " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn, + conn->sess->max_cmd_sn); + spin_unlock(&conn->sess->cmdsn_lock); + return CMDSN_ERROR_CANNOT_RECOVER; + } + + if (!conn->sess->cmdsn_outoforder) { + if (cmdsn == conn->sess->exp_cmd_sn) { + conn->sess->exp_cmd_sn++; + TRACE(TRACE_CMDSN, "Received CmdSN matches ExpCmdSN," + " incremented ExpCmdSN to: 0x%08x\n", + conn->sess->exp_cmd_sn); + ret = iscsit_execute_cmd(cmd, 0); + spin_unlock(&conn->sess->cmdsn_lock); + + return (!ret) ? CMDSN_NORMAL_OPERATION : + CMDSN_ERROR_CANNOT_RECOVER; + } else if (serial_gt(cmdsn, conn->sess->exp_cmd_sn)) { + TRACE(TRACE_CMDSN, "Received CmdSN: 0x%08x is greater" + " than ExpCmdSN: 0x%08x, not acknowledging.\n", + cmdsn, conn->sess->exp_cmd_sn); + goto ooo_cmdsn; + } else { + printk(KERN_ERR "Received CmdSN: 0x%08x is less than" + " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn, + conn->sess->exp_cmd_sn); + spin_unlock(&conn->sess->cmdsn_lock); + return CMDSN_LOWER_THAN_EXP; + } + } else { + int counter = 0; + u32 old_expcmdsn = 0; + if (cmdsn == conn->sess->exp_cmd_sn) { + old_expcmdsn = conn->sess->exp_cmd_sn++; + TRACE(TRACE_CMDSN, "Got missing CmdSN: 0x%08x matches" + " ExpCmdSN, incremented ExpCmdSN to 0x%08x.\n", + cmdsn, conn->sess->exp_cmd_sn); + + if (iscsit_execute_cmd(cmd, 0) < 0) { + spin_unlock(&conn->sess->cmdsn_lock); + return CMDSN_ERROR_CANNOT_RECOVER; + } + } else if (serial_gt(cmdsn, conn->sess->exp_cmd_sn)) { + TRACE(TRACE_CMDSN, "CmdSN: 0x%08x greater than" + " ExpCmdSN: 0x%08x, not acknowledging.\n", + cmdsn, conn->sess->exp_cmd_sn); + goto ooo_cmdsn; + } else { + printk(KERN_ERR "CmdSN: 0x%08x less than ExpCmdSN:" + " 0x%08x, ignoring.\n", cmdsn, + conn->sess->exp_cmd_sn); + spin_unlock(&conn->sess->cmdsn_lock); + return CMDSN_LOWER_THAN_EXP; + } + + counter = iscsit_execute_ooo_cmdsns(conn->sess); + if (counter < 0) { + spin_unlock(&conn->sess->cmdsn_lock); + return CMDSN_ERROR_CANNOT_RECOVER; + } + + if (counter == conn->sess->ooo_cmdsn_count) { + if (conn->sess->ooo_cmdsn_count == 1) { + TRACE(TRACE_CMDSN, "Received final missing" + " CmdSN: 0x%08x.\n", old_expcmdsn); + } else { + TRACE(TRACE_CMDSN, "Received final missing" + " CmdSNs: 0x%08x->0x%08x.\n", + old_expcmdsn, (conn->sess->exp_cmd_sn - 1)); + } + + conn->sess->ooo_cmdsn_count = 0; + conn->sess->cmdsn_outoforder = 0; + } else { + conn->sess->ooo_cmdsn_count -= counter; + TRACE(TRACE_CMDSN, "Still missing %hu CmdSN(s)," + " continuing out of order operation.\n", + conn->sess->ooo_cmdsn_count); + } + spin_unlock(&conn->sess->cmdsn_lock); + return CMDSN_NORMAL_OPERATION; + } + +ooo_cmdsn: + ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, cmdsn); + spin_unlock(&conn->sess->cmdsn_lock); + return ret; +} + +int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf) +{ + struct iscsi_conn *conn = cmd->conn; + struct se_cmd *se_cmd = SE_CMD(cmd); + struct iscsi_data *hdr = (struct iscsi_data *) buf; + u32 payload_length = ntoh24(hdr->dlength); + + if (conn->sess->sess_ops->InitialR2T) { + printk(KERN_ERR "Received unexpected unsolicited data" + " while InitialR2T=Yes, protocol error.\n"); + transport_send_check_condition_and_sense(se_cmd, + TCM_UNEXPECTED_UNSOLICITED_DATA, 0); + return -1; + } + + if ((cmd->first_burst_len + payload_length) > + conn->sess->sess_ops->FirstBurstLength) { + printk(KERN_ERR "Total %u bytes exceeds FirstBurstLength: %u" + " for this Unsolicited DataOut Burst.\n", + (cmd->first_burst_len + payload_length), + conn->sess->sess_ops->FirstBurstLength); + transport_send_check_condition_and_sense(se_cmd, + TCM_INCORRECT_AMOUNT_OF_DATA, 0); + return -1; + } + + if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) + return 0; + + if (((cmd->first_burst_len + payload_length) != cmd->data_length) && + ((cmd->first_burst_len + payload_length) != + 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", + (cmd->first_burst_len + payload_length), + conn->sess->sess_ops->FirstBurstLength, cmd->data_length); + transport_send_check_condition_and_sense(se_cmd, + TCM_INCORRECT_AMOUNT_OF_DATA, 0); + return -1; + } + return 0; +} + +struct iscsi_cmd *iscsit_find_cmd_from_itt( + struct iscsi_conn *conn, + u32 init_task_tag) +{ + struct iscsi_cmd *cmd; + + spin_lock_bh(&conn->cmd_lock); + list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) { + if (cmd->init_task_tag == init_task_tag) + break; + } + spin_unlock_bh(&conn->cmd_lock); + + if (!cmd) { + printk(KERN_ERR "Unable to locate ITT: 0x%08x on CID: %hu", + init_task_tag, conn->cid); + return NULL; + } + + return cmd; +} + +struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump( + struct iscsi_conn *conn, + u32 init_task_tag, + u32 length) +{ + struct iscsi_cmd *cmd; + + spin_lock_bh(&conn->cmd_lock); + list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) { + if (cmd->init_task_tag == init_task_tag) + break; + } + spin_unlock_bh(&conn->cmd_lock); + + if (!cmd) { + printk(KERN_ERR "Unable to locate ITT: 0x%08x on CID: %hu," + " dumping payload\n", init_task_tag, conn->cid); + if (length) + iscsit_dump_data_payload(conn, length, 1); + return NULL; + } + + return cmd; +} + +struct iscsi_cmd *iscsit_find_cmd_from_ttt( + struct iscsi_conn *conn, + u32 targ_xfer_tag) +{ + struct iscsi_cmd *cmd = NULL; + + spin_lock_bh(&conn->cmd_lock); + list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) { + if (cmd->targ_xfer_tag == targ_xfer_tag) + break; + } + spin_unlock_bh(&conn->cmd_lock); + + if (!cmd) { + printk(KERN_ERR "Unable to locate TTT: 0x%08x on CID: %hu\n", + targ_xfer_tag, conn->cid); + return NULL; + } + + return cmd; +} + +int iscsit_find_cmd_for_recovery( + struct iscsi_session *sess, + struct iscsi_cmd **cmd_ptr, + struct iscsi_conn_recovery **cr_ptr, + u32 init_task_tag) +{ + int found_itt = 0; + struct iscsi_cmd *cmd = NULL; + struct iscsi_conn_recovery *cr; + + /* + * Scan through the inactive connection recovery list's command list. + * If init_task_tag matches the command is still alligent. + */ + spin_lock(&sess->cr_i_lock); + list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) { + spin_lock(&cr->conn_recovery_cmd_lock); + list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) { + if (cmd->init_task_tag == init_task_tag) { + found_itt = 1; + break; + } + } + spin_unlock(&cr->conn_recovery_cmd_lock); + if (found_itt) + break; + } + spin_unlock(&sess->cr_i_lock); + + if (cmd) { + *cr_ptr = cr; + *cmd_ptr = cmd; + return -2; + } + + found_itt = 0; + + /* + * Scan through the active connection recovery list's command list. + * If init_task_tag matches the command is ready to be reassigned. + */ + spin_lock(&sess->cr_a_lock); + list_for_each_entry(cr, &sess->cr_active_list, cr_list) { + spin_lock(&cr->conn_recovery_cmd_lock); + list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) { + if (cmd->init_task_tag == init_task_tag) { + found_itt = 1; + break; + } + } + spin_unlock(&cr->conn_recovery_cmd_lock); + if (found_itt) + break; + } + spin_unlock(&sess->cr_a_lock); + + if (!cmd || !cr) + return -1; + + *cr_ptr = cr; + *cmd_ptr = cmd; + + return 0; +} + +void iscsit_add_cmd_to_immediate_queue( + struct iscsi_cmd *cmd, + struct iscsi_conn *conn, + u8 state) +{ + struct iscsi_queue_req *qr; + + qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); + if (!qr) { + printk(KERN_ERR "Unable to allocate memory for" + " struct iscsi_queue_req\n"); + return; + } + INIT_LIST_HEAD(&qr->qr_list); + qr->cmd = cmd; + qr->state = state; + + spin_lock_bh(&conn->immed_queue_lock); + list_add_tail(&qr->qr_list, &conn->immed_queue_list); + atomic_inc(&cmd->immed_queue_count); + atomic_set(&conn->check_immediate_queue, 1); + spin_unlock_bh(&conn->immed_queue_lock); + + wake_up_process(conn->thread_set->tx_thread); +} + +struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn) +{ + struct iscsi_queue_req *qr; + + spin_lock_bh(&conn->immed_queue_lock); + if (list_empty(&conn->immed_queue_list)) { + spin_unlock_bh(&conn->immed_queue_lock); + return NULL; + } + list_for_each_entry(qr, &conn->immed_queue_list, qr_list) + break; + + list_del(&qr->qr_list); + if (qr->cmd) + atomic_dec(&qr->cmd->immed_queue_count); + spin_unlock_bh(&conn->immed_queue_lock); + + return qr; +} + +static void iscsit_remove_cmd_from_immediate_queue( + struct iscsi_cmd *cmd, + struct iscsi_conn *conn) +{ + struct iscsi_queue_req *qr, *qr_tmp; + + spin_lock_bh(&conn->immed_queue_lock); + if (!atomic_read(&cmd->immed_queue_count)) { + spin_unlock_bh(&conn->immed_queue_lock); + return; + } + + list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { + if (qr->cmd != cmd) + continue; + + atomic_dec(&qr->cmd->immed_queue_count); + list_del(&qr->qr_list); + kmem_cache_free(lio_qr_cache, qr); + } + spin_unlock_bh(&conn->immed_queue_lock); + + if (atomic_read(&cmd->immed_queue_count)) { + printk(KERN_ERR "ITT: 0x%08x immed_queue_count: %d\n", + cmd->init_task_tag, + atomic_read(&cmd->immed_queue_count)); + } +} + +void iscsit_add_cmd_to_response_queue( + struct iscsi_cmd *cmd, + struct iscsi_conn *conn, + u8 state) +{ + struct iscsi_queue_req *qr; + + qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); + if (!qr) { + printk(KERN_ERR "Unable to allocate memory for" + " struct iscsi_queue_req\n"); + return; + } + INIT_LIST_HEAD(&qr->qr_list); + qr->cmd = cmd; + qr->state = state; + + spin_lock_bh(&conn->response_queue_lock); + list_add_tail(&qr->qr_list, &conn->response_queue_list); + atomic_inc(&cmd->response_queue_count); + spin_unlock_bh(&conn->response_queue_lock); + + wake_up_process(conn->thread_set->tx_thread); +} + +struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn) +{ + struct iscsi_queue_req *qr; + + spin_lock_bh(&conn->response_queue_lock); + if (list_empty(&conn->response_queue_list)) { + spin_unlock_bh(&conn->response_queue_lock); + return NULL; + } + + list_for_each_entry(qr, &conn->response_queue_list, qr_list) + break; + + list_del(&qr->qr_list); + if (qr->cmd) + atomic_dec(&qr->cmd->response_queue_count); + spin_unlock_bh(&conn->response_queue_lock); + + return qr; +} + +static void iscsit_remove_cmd_from_response_queue( + struct iscsi_cmd *cmd, + struct iscsi_conn *conn) +{ + struct iscsi_queue_req *qr, *qr_tmp; + + spin_lock_bh(&conn->response_queue_lock); + if (!(atomic_read(&cmd->response_queue_count))) { + spin_unlock_bh(&conn->response_queue_lock); + return; + } + + list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, + qr_list) { + if (qr->cmd != cmd) + continue; + + atomic_dec(&qr->cmd->response_queue_count); + list_del(&qr->qr_list); + kmem_cache_free(lio_qr_cache, qr); + } + spin_unlock_bh(&conn->response_queue_lock); + + if (atomic_read(&cmd->response_queue_count)) { + printk(KERN_ERR "ITT: 0x%08x response_queue_count: %d\n", + cmd->init_task_tag, + atomic_read(&cmd->response_queue_count)); + } +} + +void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn) +{ + struct iscsi_queue_req *qr, *qr_tmp; + + spin_lock_bh(&conn->immed_queue_lock); + list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { + list_del(&qr->qr_list); + if (qr->cmd) + atomic_dec(&qr->cmd->immed_queue_count); + + kmem_cache_free(lio_qr_cache, qr); + } + spin_unlock_bh(&conn->immed_queue_lock); + + spin_lock_bh(&conn->response_queue_lock); + list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, + qr_list) { + list_del(&qr->qr_list); + if (qr->cmd) + atomic_dec(&qr->cmd->response_queue_count); + + kmem_cache_free(lio_qr_cache, qr); + } + spin_unlock_bh(&conn->response_queue_lock); +} + +void iscsit_release_cmd_direct(struct iscsi_cmd *cmd) +{ + iscsit_free_r2ts_from_list(cmd); + iscsit_free_all_datain_reqs(cmd); + + kfree(cmd->buf_ptr); + kfree(cmd->pdu_list); + kfree(cmd->seq_list); + kfree(cmd->tmr_req); + kfree(cmd->iov_data); + + kmem_cache_free(lio_cmd_cache, cmd); +} + +void __iscsit_release_cmd_to_pool(struct iscsi_cmd *cmd, struct iscsi_session *sess) +{ + struct iscsi_conn *conn = cmd->conn; + + iscsit_free_r2ts_from_list(cmd); + iscsit_free_all_datain_reqs(cmd); + + kfree(cmd->buf_ptr); + kfree(cmd->pdu_list); + kfree(cmd->seq_list); + kfree(cmd->tmr_req); + kfree(cmd->iov_data); + + if (conn) { + iscsit_remove_cmd_from_immediate_queue(cmd, conn); + iscsit_remove_cmd_from_response_queue(cmd, conn); + } + + kmem_cache_free(lio_cmd_cache, cmd); +} + +void iscsit_release_cmd_to_pool(struct iscsi_cmd *cmd) +{ + if (!cmd->conn && !cmd->sess) { + iscsit_release_cmd_direct(cmd); + } else { + __iscsit_release_cmd_to_pool(cmd, (cmd->conn) ? + cmd->conn->sess : cmd->sess); + } +} + +/* + * Routine to pack an ordinary (LINUX) LUN 32-bit number + * into an 8-byte LUN structure + * (see SAM-2, Section 4.12.3 page 39) + * Thanks to UNH for help with this :-). + */ +inline u64 iscsit_pack_lun(unsigned int lun) +{ + u64 result; + + result = ((lun & 0xff) << 8); /* LSB of lun into byte 1 big-endian */ + + if (0) { + /* use flat space addressing method, SAM-2 Section 4.12.4 + - high-order 2 bits of byte 0 are 01 + - low-order 6 bits of byte 0 are MSB of the lun + - all 8 bits of byte 1 are LSB of the lun + - all other bytes (2 thru 7) are 0 + */ + result |= 0x40 | ((lun >> 8) & 0x3f); + } + /* else use peripheral device addressing method, Sam-2 Section 4.12.5 + - high-order 2 bits of byte 0 are 00 + - low-order 6 bits of byte 0 are all 0 + - all 8 bits of byte 1 are the lun + - all other bytes (2 thru 7) are 0 + */ + + return cpu_to_le64(result); +} + +/* + * Routine to pack an 8-byte LUN structure into a ordinary (LINUX) 32-bit + * LUN number (see SAM-2, Section 4.12.3 page 39) + * Thanks to UNH for help with this :-). + */ +inline u32 iscsit_unpack_lun(unsigned char *lun_ptr) +{ + u32 result, temp; + + result = *(lun_ptr+1); /* LSB of lun from byte 1 big-endian */ + + switch (temp = ((*lun_ptr)>>6)) { /* high 2 bits of byte 0 big-endian */ + case 0: /* peripheral device addressing method, Sam-2 Section 4.12.5 + - high-order 2 bits of byte 0 are 00 + - low-order 6 bits of byte 0 are all 0 + - all 8 bits of byte 1 are the lun + - all other bytes (2 thru 7) are 0 + */ + if (*lun_ptr != 0) { + printk(KERN_ERR "Illegal Byte 0 in LUN peripheral" + " device addressing method %u, expected 0\n", + *lun_ptr); + } + break; + case 1: /* flat space addressing method, SAM-2 Section 4.12.4 + - high-order 2 bits of byte 0 are 01 + - low-order 6 bits of byte 0 are MSB of the lun + - all 8 bits of byte 1 are LSB of the lun + - all other bytes (2 thru 7) are 0 + */ + result += ((*lun_ptr) & 0x3f) << 8; + break; + default: /* (extended) logical unit addressing */ + printk(KERN_ERR "Unimplemented LUN addressing method %u, " + "PDA method used instead\n", temp); + break; + } + + return result; +} + +int iscsit_check_session_usage_count(struct iscsi_session *sess) +{ + spin_lock_bh(&sess->session_usage_lock); + if (atomic_read(&sess->session_usage_count)) { + atomic_set(&sess->session_waiting_on_uc, 1); + spin_unlock_bh(&sess->session_usage_lock); + if (in_interrupt()) + return 2; + + wait_for_completion(&sess->session_waiting_on_uc_comp); + return 1; + } + spin_unlock_bh(&sess->session_usage_lock); + + return 0; +} + +void iscsit_dec_session_usage_count(struct iscsi_session *sess) +{ + spin_lock_bh(&sess->session_usage_lock); + atomic_dec(&sess->session_usage_count); + + if (!atomic_read(&sess->session_usage_count) && + atomic_read(&sess->session_waiting_on_uc)) + complete(&sess->session_waiting_on_uc_comp); + + spin_unlock_bh(&sess->session_usage_lock); +} + +void iscsit_inc_session_usage_count(struct iscsi_session *sess) +{ + spin_lock_bh(&sess->session_usage_lock); + atomic_inc(&sess->session_usage_count); + spin_unlock_bh(&sess->session_usage_lock); +} + +/* + * Used before iscsi_do[rx,tx]_data() to determine iov and [rx,tx]_marker + * array counts needed for sync and steering. + */ +static inline int iscsit_determine_sync_and_steering_counts( + struct iscsi_conn *conn, + struct iscsi_data_count *count) +{ + u32 length = count->data_length; + u32 marker, markint; + + count->sync_and_steering = 1; + + marker = (count->type == ISCSI_RX_DATA) ? + conn->of_marker : conn->if_marker; + markint = (count->type == ISCSI_RX_DATA) ? + (conn->conn_ops->OFMarkInt * 4) : + (conn->conn_ops->IFMarkInt * 4); + count->ss_iov_count = count->iov_count; + + while (length > 0) { + if (length >= marker) { + count->ss_iov_count += 3; + count->ss_marker_count += 2; + + length -= marker; + marker = markint; + } else + length = 0; + } + + return 0; +} + +/* + * Setup conn->if_marker and conn->of_marker values based upon + * the initial marker-less interval. (see iSCSI v19 A.2) + */ +int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn) +{ + int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0; + /* + * IFMarkInt and OFMarkInt are negotiated as 32-bit words. + */ + u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4); + u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4); + + if (conn->conn_ops->OFMarker) { + /* + * Account for the first Login Command received not + * via iscsi_recv_msg(). + */ + conn->of_marker += ISCSI_HDR_LEN; + if (conn->of_marker <= OFMarkInt) { + conn->of_marker = (OFMarkInt - conn->of_marker); + } else { + login_ofmarker_count = (conn->of_marker / OFMarkInt); + next_marker = (OFMarkInt * (login_ofmarker_count + 1)) + + (login_ofmarker_count * MARKER_SIZE); + conn->of_marker = (next_marker - conn->of_marker); + } + conn->of_marker_offset = 0; + printk(KERN_INFO "Setting OFMarker value to %u based on Initial" + " Markerless Interval.\n", conn->of_marker); + } + + if (conn->conn_ops->IFMarker) { + if (conn->if_marker <= IFMarkInt) { + conn->if_marker = (IFMarkInt - conn->if_marker); + } else { + login_ifmarker_count = (conn->if_marker / IFMarkInt); + next_marker = (IFMarkInt * (login_ifmarker_count + 1)) + + (login_ifmarker_count * MARKER_SIZE); + conn->if_marker = (next_marker - conn->if_marker); + } + printk(KERN_INFO "Setting IFMarker value to %u based on Initial" + " Markerless Interval.\n", conn->if_marker); + } + + return 0; +} + +unsigned char *iscsit_ntoa(u32 ip) +{ + static unsigned char buf[18]; + + memset(buf, 0, 18); + sprintf(buf, "%u.%u.%u.%u", ((ip >> 24) & 0xff), ((ip >> 16) & 0xff), + ((ip >> 8) & 0xff), (ip & 0xff)); + + return buf; +} + +void iscsit_ntoa2(unsigned char *buf, u32 ip) +{ + memset(buf, 0, 18); + sprintf(buf, "%u.%u.%u.%u", ((ip >> 24) & 0xff), ((ip >> 16) & 0xff), + ((ip >> 8) & 0xff), (ip & 0xff)); +} + +#define NS_INT16SZ 2 +#define NS_INADDRSZ 4 +#define NS_IN6ADDRSZ 16 + +/* const char * + * inet_ntop4(src, dst, size) + * format an IPv4 address + * return: + * `dst' (as a const) + * notes: + * (1) uses no statics + * (2) takes a unsigned char* not an in_addr as input + * author: + * Paul Vixie, 1996. + */ +static const char *iscsit_ntop4( + const unsigned char *src, + char *dst, + size_t size) +{ + static const char *fmt = "%u.%u.%u.%u"; + char tmp[sizeof "255.255.255.255"]; + size_t len; + + len = snprintf(tmp, sizeof tmp, fmt, src[0], src[1], src[2], src[3]); + if (len >= size) { + printk(KERN_ERR "len: %d >= size: %d\n", (int)len, (int)size); + return NULL; + } + memcpy(dst, tmp, len + 1); + + return dst; +} + +/* const char * + * isc_inet_ntop6(src, dst, size) + * convert IPv6 binary address into presentation (printable) format + * author: + * Paul Vixie, 1996. + */ +const char *iscsit_ntop6(const unsigned char *src, char *dst, size_t size) +{ + /* + * Note that int32_t and int16_t need only be "at least" large enough + * to contain a value of the specified size. On some systems, like + * Crays, there is no such thing as an integer variable with 16 bits. + * Keep this in mind if you think this function should have been coded + * to use pointer overlays. All the world's not a VAX. + */ + char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp; + struct { int base, len; } best, cur; + unsigned int words[NS_IN6ADDRSZ / NS_INT16SZ]; + int i, inc; + + best.len = best.base = 0; + cur.len = cur.base = 0; + + /* + * Preprocess: + * Copy the input (bytewise) array into a wordwise array. + * Find the longest run of 0x00's in src[] for :: shorthanding. + */ + memset(words, '\0', sizeof words); + for (i = 0; i < NS_IN6ADDRSZ; i++) + words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3)); + best.base = -1; + cur.base = -1; + for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { + if (words[i] == 0) { + if (cur.base == -1) + cur.base = i, cur.len = 1; + else + cur.len++; + } else { + if (cur.base != -1) { + if (best.base == -1 || cur.len > best.len) + best = cur; + cur.base = -1; + } + } + } + if (cur.base != -1) { + if (best.base == -1 || cur.len > best.len) + best = cur; + } + if (best.base != -1 && best.len < 2) + best.base = -1; + + /* + * Format the result. + */ + tp = tmp; + for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { + /* Are we inside the best run of 0x00's? */ + if (best.base != -1 && i >= best.base && + i < (best.base + best.len)) { + if (i == best.base) + *tp++ = ':'; + continue; + } + /* Are we following an initial run of 0x00s or any real hex? */ + if (i != 0) + *tp++ = ':'; + /* Is this address an encapsulated IPv4? */ + if (i == 6 && best.base == 0 && + (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) { + if (!iscsit_ntop4(src+12, tp, sizeof tmp - (tp - tmp))) + return NULL; + tp += strlen(tp); + break; + } + inc = snprintf(tp, 5, "%x", words[i]); + if (inc < 5) + return NULL; + tp += inc; + } + /* Was it a trailing run of 0x00's? */ + if (best.base != -1 && (best.base + best.len) == + (NS_IN6ADDRSZ / NS_INT16SZ)) + *tp++ = ':'; + *tp++ = '\0'; + + /* + * Check for overflow, copy, and we're done. + */ + if ((size_t)(tp - tmp) > size) { + printk(KERN_ERR "(size_t)(tp - tmp): %d > size: %d\n", + (int)(tp - tmp), (int)size); + return NULL; + } + memcpy(dst, tmp, tp - tmp); + return dst; +} + +/* int + * inet_pton4(src, dst) + * like inet_aton() but without all the hexadecimal and shorthand. + * return: + * 1 if `src' is a valid dotted quad, else 0. + * notice: + * does not touch `dst' unless it's returning 1. + * author: + * Paul Vixie, 1996. + */ +static int iscsit_pton4(const char *src, unsigned char *dst) +{ + static const char digits[] = "0123456789"; + int saw_digit, octets, ch; + unsigned char tmp[NS_INADDRSZ], *tp; + + saw_digit = 0; + octets = 0; + *(tp = tmp) = 0; + while ((ch = *src++) != '\0') { + const char *pch; + + pch = strchr(digits, ch); + if (pch != NULL) { + unsigned int new = *tp * 10 + (pch - digits); + + if (new > 255) + return 0; + *tp = new; + if (!saw_digit) { + if (++octets > 4) + return 0; + saw_digit = 1; + } + } else if (ch == '.' && saw_digit) { + if (octets == 4) + return 0; + *++tp = 0; + saw_digit = 0; + } else + return 0; + } + if (octets < 4) + return 0; + memcpy(dst, tmp, NS_INADDRSZ); + return 1; +} + +/* int + * inet_pton6(src, dst) + * convert presentation level address to network order binary form. + * return: + * 1 if `src' is a valid [RFC1884 2.2] address, else 0. + * notice: + * (1) does not touch `dst' unless it's returning 1. + * (2) :: in a full address is silently ignored. + * credit: + * inspired by Mark Andrews. + * author: + * Paul Vixie, 1996. + */ +int iscsit_pton6(const char *src, unsigned char *dst) +{ + static const char xdigits_l[] = "0123456789abcdef", + xdigits_u[] = "0123456789ABCDEF"; + unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; + const char *xdigits, *curtok; + int ch, saw_xdigit; + unsigned int val; + + memset((tp = tmp), '\0', NS_IN6ADDRSZ); + endp = tp + NS_IN6ADDRSZ; + colonp = NULL; + /* Leading :: requires some special handling. */ + if (*src == ':') + if (*++src != ':') + return 0; + curtok = src; + saw_xdigit = 0; + val = 0; + while ((ch = *src++) != '\0') { + const char *pch; + + pch = strchr((xdigits = xdigits_l), ch); + if (pch == NULL) + pch = strchr((xdigits = xdigits_u), ch); + if (pch != NULL) { + val <<= 4; + val |= (pch - xdigits); + if (val > 0xffff) + return 0; + saw_xdigit = 1; + continue; + } + if (ch == ':') { + curtok = src; + if (!saw_xdigit) { + if (colonp) + return 0; + colonp = tp; + continue; + } + if (tp + NS_INT16SZ > endp) + return 0; + *tp++ = (unsigned char) (val >> 8) & 0xff; + *tp++ = (unsigned char) val & 0xff; + saw_xdigit = 0; + val = 0; + continue; + } + if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && + iscsit_pton4(curtok, tp) > 0) { + tp += NS_INADDRSZ; + saw_xdigit = 0; + break; /* '\0' was seen by inet_pton4(). */ + } + return 0; + } + if (saw_xdigit) { + if (tp + NS_INT16SZ > endp) + return 0; + *tp++ = (unsigned char) (val >> 8) & 0xff; + *tp++ = (unsigned char) val & 0xff; + } + if (colonp != NULL) { + /* + * Since some memmove()'s erroneously fail to handle + * overlapping regions, we'll do the shift by hand. + */ + const int n = tp - colonp; + int i; + + for (i = 1; i <= n; i++) { + endp[-i] = colonp[n - i]; + colonp[n - i] = 0; + } + tp = endp; + } + if (tp != endp) + return 0; + memcpy(dst, tmp, NS_IN6ADDRSZ); + return 1; +} + +struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid) +{ + struct iscsi_conn *conn; + + spin_lock_bh(&sess->conn_lock); + list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { + if ((conn->cid == cid) && + (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) { + iscsit_inc_conn_usage_count(conn); + spin_unlock_bh(&sess->conn_lock); + return conn; + } + } + spin_unlock_bh(&sess->conn_lock); + + return NULL; +} + +struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid) +{ + struct iscsi_conn *conn; + + spin_lock_bh(&sess->conn_lock); + list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { + if (conn->cid == cid) { + iscsit_inc_conn_usage_count(conn); + spin_lock(&conn->state_lock); + atomic_set(&conn->connection_wait_rcfr, 1); + spin_unlock(&conn->state_lock); + spin_unlock_bh(&sess->conn_lock); + return conn; + } + } + spin_unlock_bh(&sess->conn_lock); + + return NULL; +} + +void iscsit_check_conn_usage_count(struct iscsi_conn *conn) +{ + spin_lock_bh(&conn->conn_usage_lock); + if (atomic_read(&conn->conn_usage_count)) { + atomic_set(&conn->conn_waiting_on_uc, 1); + spin_unlock_bh(&conn->conn_usage_lock); + + wait_for_completion(&conn->conn_waiting_on_uc_comp); + return; + } + spin_unlock_bh(&conn->conn_usage_lock); +} + +void iscsit_dec_conn_usage_count(struct iscsi_conn *conn) +{ + spin_lock_bh(&conn->conn_usage_lock); + atomic_dec(&conn->conn_usage_count); + + if (!atomic_read(&conn->conn_usage_count) && + atomic_read(&conn->conn_waiting_on_uc)) + complete(&conn->conn_waiting_on_uc_comp); + + spin_unlock_bh(&conn->conn_usage_lock); +} + +void iscsit_inc_conn_usage_count(struct iscsi_conn *conn) +{ + spin_lock_bh(&conn->conn_usage_lock); + atomic_inc(&conn->conn_usage_count); + spin_unlock_bh(&conn->conn_usage_lock); +} + +int iscsit_check_for_active_network_device(struct iscsi_conn *conn) +{ + struct net_device *net_dev; + + if (!conn->net_if) { + printk(KERN_ERR "struct iscsi_conn->net_if is NULL for CID:" + " %hu\n", conn->cid); + return 0; + } + net_dev = conn->net_if; + + return netif_carrier_ok(net_dev); +} + +static void iscsit_handle_netif_timeout(unsigned long data) +{ + struct iscsi_conn *conn = (struct iscsi_conn *) data; + + iscsit_inc_conn_usage_count(conn); + + spin_lock_bh(&conn->netif_lock); + if (conn->netif_timer_flags & ISCSI_TF_STOP) { + spin_unlock_bh(&conn->netif_lock); + iscsit_dec_conn_usage_count(conn); + return; + } + conn->netif_timer_flags &= ~ISCSI_TF_RUNNING; + + if (iscsit_check_for_active_network_device((void *)conn)) { + iscsit_start_netif_timer(conn); + spin_unlock_bh(&conn->netif_lock); + iscsit_dec_conn_usage_count(conn); + return; + } + + printk(KERN_ERR "Detected PHY loss on Network Interface: %s for iSCSI" + " CID: %hu on SID: %u\n", conn->net_dev, conn->cid, + conn->sess->sid); + + spin_unlock_bh(&conn->netif_lock); + + iscsit_cause_connection_reinstatement(conn, 0); + iscsit_dec_conn_usage_count(conn); +} + +void iscsit_get_network_interface_from_conn(struct iscsi_conn *conn) +{ + struct net_device *net_dev; + + net_dev = dev_get_by_name(&init_net, conn->net_dev); + if (!net_dev) { + printk(KERN_ERR "Unable to locate active network interface:" + " %s\n", strlen(conn->net_dev) ? + conn->net_dev : "None"); + conn->net_if = NULL; + return; + } + + conn->net_if = net_dev; +} + +/* + * Called with conn->netif_lock held. + */ +void iscsit_start_netif_timer(struct iscsi_conn *conn) +{ + struct iscsi_portal_group *tpg = ISCSI_TPG_C(conn); + + if (!conn->net_if) + return; + + if (conn->netif_timer_flags & ISCSI_TF_RUNNING) + return; + + init_timer(&conn->transport_timer); + conn->transport_timer.expires = + (get_jiffies_64() + ISCSI_TPG_ATTRIB(tpg)->netif_timeout * HZ); + conn->transport_timer.data = (unsigned long)conn; + conn->transport_timer.function = iscsit_handle_netif_timeout; + conn->netif_timer_flags &= ~ISCSI_TF_STOP; + conn->netif_timer_flags |= ISCSI_TF_RUNNING; + add_timer(&conn->transport_timer); +} + +void iscsit_stop_netif_timer(struct iscsi_conn *conn) +{ + spin_lock_bh(&conn->netif_lock); + if (!(conn->netif_timer_flags & ISCSI_TF_RUNNING)) { + spin_unlock_bh(&conn->netif_lock); + return; + } + conn->netif_timer_flags |= ISCSI_TF_STOP; + spin_unlock_bh(&conn->netif_lock); + + del_timer_sync(&conn->transport_timer); + + spin_lock_bh(&conn->netif_lock); + conn->netif_timer_flags &= ~ISCSI_TF_RUNNING; + spin_unlock_bh(&conn->netif_lock); +} + +static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response) +{ + u8 state; + struct iscsi_cmd *cmd; + + cmd = iscsit_allocate_cmd(conn); + if (!cmd) + return -1; + + cmd->iscsi_opcode = ISCSI_OP_NOOP_IN; + state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE : + ISTATE_SEND_NOPIN_NO_RESPONSE; + cmd->init_task_tag = 0xFFFFFFFF; + spin_lock_bh(&conn->sess->ttt_lock); + cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ : + 0xFFFFFFFF; + if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF)) + cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; + spin_unlock_bh(&conn->sess->ttt_lock); + + spin_lock_bh(&conn->cmd_lock); + list_add_tail(&cmd->i_list, &conn->conn_cmd_list); + spin_unlock_bh(&conn->cmd_lock); + + if (want_response) + iscsit_start_nopin_response_timer(conn); + iscsit_add_cmd_to_immediate_queue(cmd, conn, state); + + return 0; +} + +static void iscsit_handle_nopin_response_timeout(unsigned long data) +{ + struct iscsi_conn *conn = (struct iscsi_conn *) data; + + iscsit_inc_conn_usage_count(conn); + + spin_lock_bh(&conn->nopin_timer_lock); + if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) { + spin_unlock_bh(&conn->nopin_timer_lock); + iscsit_dec_conn_usage_count(conn); + return; + } + + TRACE(TRACE_TIMER, "Did not receive response to NOPIN on CID: %hu on" + " SID: %u, failing connection.\n", conn->cid, + conn->sess->sid); + conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; + spin_unlock_bh(&conn->nopin_timer_lock); + + { + struct iscsi_portal_group *tpg = conn->sess->tpg; + struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; + + if (tiqn) { + spin_lock_bh(&tiqn->sess_err_stats.lock); + strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name, + (void *)conn->sess->sess_ops->InitiatorName); + tiqn->sess_err_stats.last_sess_failure_type = + ISCSI_SESS_ERR_CXN_TIMEOUT; + tiqn->sess_err_stats.cxn_timeout_errors++; + conn->sess->conn_timeout_errors++; + spin_unlock_bh(&tiqn->sess_err_stats.lock); + } + } + + iscsit_cause_connection_reinstatement(conn, 0); + iscsit_dec_conn_usage_count(conn); +} + +void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn) +{ + struct iscsi_session *sess = conn->sess; + struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); + + spin_lock_bh(&conn->nopin_timer_lock); + if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { + spin_unlock_bh(&conn->nopin_timer_lock); + return; + } + + mod_timer(&conn->nopin_response_timer, + (get_jiffies_64() + na->nopin_response_timeout * HZ)); + spin_unlock_bh(&conn->nopin_timer_lock); +} + +/* + * Called with conn->nopin_timer_lock held. + */ +void iscsit_start_nopin_response_timer(struct iscsi_conn *conn) +{ + struct iscsi_session *sess = conn->sess; + struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); + + spin_lock_bh(&conn->nopin_timer_lock); + if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) { + spin_unlock_bh(&conn->nopin_timer_lock); + return; + } + + init_timer(&conn->nopin_response_timer); + conn->nopin_response_timer.expires = + (get_jiffies_64() + na->nopin_response_timeout * HZ); + conn->nopin_response_timer.data = (unsigned long)conn; + conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout; + conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP; + conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING; + add_timer(&conn->nopin_response_timer); + + TRACE(TRACE_TIMER, "Started NOPIN Response Timer on CID: %d to %u" + " seconds\n", conn->cid, na->nopin_response_timeout); + spin_unlock_bh(&conn->nopin_timer_lock); +} + +void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn) +{ + spin_lock_bh(&conn->nopin_timer_lock); + if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { + spin_unlock_bh(&conn->nopin_timer_lock); + return; + } + conn->nopin_response_timer_flags |= ISCSI_TF_STOP; + spin_unlock_bh(&conn->nopin_timer_lock); + + del_timer_sync(&conn->nopin_response_timer); + + spin_lock_bh(&conn->nopin_timer_lock); + conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; + spin_unlock_bh(&conn->nopin_timer_lock); +} + +static void iscsit_handle_nopin_timeout(unsigned long data) +{ + struct iscsi_conn *conn = (struct iscsi_conn *) data; + + iscsit_inc_conn_usage_count(conn); + + spin_lock_bh(&conn->nopin_timer_lock); + if (conn->nopin_timer_flags & ISCSI_TF_STOP) { + spin_unlock_bh(&conn->nopin_timer_lock); + iscsit_dec_conn_usage_count(conn); + return; + } + conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; + spin_unlock_bh(&conn->nopin_timer_lock); + + iscsit_add_nopin(conn, 1); + iscsit_dec_conn_usage_count(conn); +} + +/* + * Called with conn->nopin_timer_lock held. + */ +void __iscsit_start_nopin_timer(struct iscsi_conn *conn) +{ + struct iscsi_session *sess = conn->sess; + struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); + /* + * NOPIN timeout is disabled. + */ + if (!na->nopin_timeout) + return; + + if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) + return; + + init_timer(&conn->nopin_timer); + conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); + conn->nopin_timer.data = (unsigned long)conn; + conn->nopin_timer.function = iscsit_handle_nopin_timeout; + conn->nopin_timer_flags &= ~ISCSI_TF_STOP; + conn->nopin_timer_flags |= ISCSI_TF_RUNNING; + add_timer(&conn->nopin_timer); + + TRACE(TRACE_TIMER, "Started NOPIN Timer on CID: %d at %u second" + " interval\n", conn->cid, na->nopin_timeout); +} + +void iscsit_start_nopin_timer(struct iscsi_conn *conn) +{ + struct iscsi_session *sess = conn->sess; + struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); + /* + * NOPIN timeout is disabled.. + */ + if (!na->nopin_timeout) + return; + + spin_lock_bh(&conn->nopin_timer_lock); + if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) { + spin_unlock_bh(&conn->nopin_timer_lock); + return; + } + + init_timer(&conn->nopin_timer); + conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); + conn->nopin_timer.data = (unsigned long)conn; + conn->nopin_timer.function = iscsit_handle_nopin_timeout; + conn->nopin_timer_flags &= ~ISCSI_TF_STOP; + conn->nopin_timer_flags |= ISCSI_TF_RUNNING; + add_timer(&conn->nopin_timer); + + TRACE(TRACE_TIMER, "Started NOPIN Timer on CID: %d at %u second" + " interval\n", conn->cid, na->nopin_timeout); + spin_unlock_bh(&conn->nopin_timer_lock); +} + +void iscsit_stop_nopin_timer(struct iscsi_conn *conn) +{ + spin_lock_bh(&conn->nopin_timer_lock); + if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) { + spin_unlock_bh(&conn->nopin_timer_lock); + return; + } + conn->nopin_timer_flags |= ISCSI_TF_STOP; + spin_unlock_bh(&conn->nopin_timer_lock); + + del_timer_sync(&conn->nopin_timer); + + spin_lock_bh(&conn->nopin_timer_lock); + conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; + spin_unlock_bh(&conn->nopin_timer_lock); +} + +int iscsit_send_tx_data( + struct iscsi_cmd *cmd, + struct iscsi_conn *conn, + int use_misc) +{ + int tx_sent, tx_size; + u32 iov_count; + struct iovec *iov; + +send_data: + tx_size = cmd->tx_size; + + if (!use_misc) { + iov = &cmd->iov_data[0]; + iov_count = cmd->iov_data_count; + } else { + iov = &cmd->iov_misc[0]; + iov_count = cmd->iov_misc_count; + } + + tx_sent = tx_data(conn, &iov[0], iov_count, tx_size); + if (tx_size != tx_sent) { + if (tx_sent == -EAGAIN) { + printk(KERN_ERR "tx_data() returned -EAGAIN\n"); + goto send_data; + } else + return -1; + } + cmd->tx_size = 0; + + return 0; +} + +int iscsit_fe_sendpage_sg( + struct se_unmap_sg *u_sg, + struct iscsi_conn *conn) +{ + int tx_sent; + struct iscsi_cmd *cmd = (struct iscsi_cmd *)u_sg->fabric_cmd; + struct se_cmd *se_cmd = SE_CMD(cmd); + u32 len = cmd->tx_size, pg_len, se_len, se_off, tx_size; + struct iovec *iov = &cmd->iov_data[0]; + struct page *page; + struct se_mem *se_mem = u_sg->cur_se_mem; + +send_hdr: + tx_size = (conn->conn_ops->HeaderDigest) ? ISCSI_HDR_LEN + CRC_LEN : + ISCSI_HDR_LEN; + tx_sent = tx_data(conn, iov, 1, tx_size); + if (tx_size != tx_sent) { + if (tx_sent == -EAGAIN) { + printk(KERN_ERR "tx_data() returned -EAGAIN\n"); + goto send_hdr; + } + return -1; + } + + len -= tx_size; + len -= u_sg->padding; + if (conn->conn_ops->DataDigest) + len -= CRC_LEN; + /* + * Start calculating from the first page of current struct se_mem. + */ + page = se_mem->se_page; + pg_len = (PAGE_SIZE - se_mem->se_off); + se_len = se_mem->se_len; + if (se_len < pg_len) + pg_len = se_len; + se_off = se_mem->se_off; + /* + * Calucate new se_len and se_off based upon u_sg->t_offset into + * the current struct se_mem and possibily a different page. + */ + while (u_sg->t_offset) { + if (u_sg->t_offset >= pg_len) { + u_sg->t_offset -= pg_len; + se_len -= pg_len; + se_off = 0; + pg_len = PAGE_SIZE; + page++; + } else { + se_off += u_sg->t_offset; + se_len -= u_sg->t_offset; + u_sg->t_offset = 0; + } + } + /* + * Perform sendpage() for each page in the struct se_mem + */ + while (len) { + if (se_len > len) + se_len = len; +send_pg: + tx_sent = conn->sock->ops->sendpage(conn->sock, + page, se_off, se_len, 0); + if (tx_sent != se_len) { + if (tx_sent == -EAGAIN) { + printk(KERN_ERR "tcp_sendpage() returned" + " -EAGAIN\n"); + goto send_pg; + } + + printk(KERN_ERR "tcp_sendpage() failure: %d\n", + tx_sent); + return -1; + } + + len -= se_len; + if (!(len)) + break; + + se_len -= tx_sent; + if (!(se_len)) { + list_for_each_entry_continue(se_mem, + T_TASK(se_cmd)->t_mem_list, se_list) + break; + + if (!se_mem) { + printk(KERN_ERR "Unable to locate next struct se_mem\n"); + return -1; + } + + se_len = se_mem->se_len; + se_off = se_mem->se_off; + page = se_mem->se_page; + } else { + se_len = PAGE_SIZE; + se_off = 0; + page++; + } + } + +send_padding: + if (u_sg->padding) { + struct iovec *iov_p = + &cmd->iov_data[cmd->iov_data_count-2]; + + tx_sent = tx_data(conn, iov_p, 1, u_sg->padding); + if (u_sg->padding != tx_sent) { + if (tx_sent == -EAGAIN) { + printk(KERN_ERR "tx_data() returned -EAGAIN\n"); + goto send_padding; + } + return -1; + } + } + +send_datacrc: + if (conn->conn_ops->DataDigest) { + struct iovec *iov_d = + &cmd->iov_data[cmd->iov_data_count-1]; + + tx_sent = tx_data(conn, iov_d, 1, CRC_LEN); + if (CRC_LEN != tx_sent) { + if (tx_sent == -EAGAIN) { + printk(KERN_ERR "tx_data() returned -EAGAIN\n"); + goto send_datacrc; + } + return -1; + } + } + + return 0; +} + +/* + * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU + * back to the Initiator when an expection condition occurs with the + * errors set in status_class and status_detail. + * + * Parameters: iSCSI Connection, Status Class, Status Detail. + * Returns: 0 on success, -1 on error. + */ +int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail) +{ + u8 iscsi_hdr[ISCSI_HDR_LEN]; + int err; + struct iovec iov; + struct iscsi_login_rsp *hdr; + + iscsit_collect_login_stats(conn, status_class, status_detail); + + memset(&iov, 0, sizeof(struct iovec)); + memset(&iscsi_hdr, 0x0, ISCSI_HDR_LEN); + + hdr = (struct iscsi_login_rsp *)&iscsi_hdr; + hdr->opcode = ISCSI_OP_LOGIN_RSP; + hdr->status_class = status_class; + hdr->status_detail = status_detail; + hdr->itt = cpu_to_be32(conn->login_itt); + + iov.iov_base = &iscsi_hdr; + iov.iov_len = ISCSI_HDR_LEN; + + PRINT_BUFF(iscsi_hdr, ISCSI_HDR_LEN); + + err = tx_data(conn, &iov, 1, ISCSI_HDR_LEN); + if (err != ISCSI_HDR_LEN) { + printk(KERN_ERR "tx_data returned less than expected\n"); + return -1; + } + + return 0; +} + +void iscsit_print_session_params(struct iscsi_session *sess) +{ + struct iscsi_conn *conn; + + printk(KERN_INFO "-----------------------------[Session Params for" + " SID: %u]-----------------------------\n", sess->sid); + spin_lock_bh(&sess->conn_lock); + list_for_each_entry(conn, &sess->sess_conn_list, conn_list) + iscsi_dump_conn_ops(conn->conn_ops); + spin_unlock_bh(&sess->conn_lock); + + iscsi_dump_sess_ops(sess->sess_ops); +} + +static inline int iscsit_do_rx_data( + struct iscsi_conn *conn, + struct iscsi_data_count *count) +{ + int data = count->data_length, rx_loop = 0, total_rx = 0; + u32 rx_marker_val[count->ss_marker_count], rx_marker_iov = 0; + struct iovec iov[count->ss_iov_count]; + mm_segment_t oldfs; + struct msghdr msg; + + if (!conn || !conn->sock || !conn->conn_ops) + return -1; + + memset(&msg, 0, sizeof(struct msghdr)); + + if (count->sync_and_steering) { + int size = 0; + u32 i, orig_iov_count = 0; + u32 orig_iov_len = 0, orig_iov_loc = 0; + u32 iov_count = 0, per_iov_bytes = 0; + u32 *rx_marker, old_rx_marker = 0; + struct iovec *iov_record; + + memset(&rx_marker_val, 0, + count->ss_marker_count * sizeof(u32)); + memset(&iov, 0, count->ss_iov_count * sizeof(struct iovec)); + + iov_record = count->iov; + orig_iov_count = count->iov_count; + rx_marker = &conn->of_marker; + + i = 0; + size = data; + orig_iov_len = iov_record[orig_iov_loc].iov_len; + while (size > 0) { + TRACE(TRACE_SSLR, "rx_data: #1 orig_iov_len %u," + " orig_iov_loc %u\n", orig_iov_len, orig_iov_loc); + TRACE(TRACE_SSLR, "rx_data: #2 rx_marker %u, size" + " %u\n", *rx_marker, size); + + if (orig_iov_len >= *rx_marker) { + iov[iov_count].iov_len = *rx_marker; + iov[iov_count++].iov_base = + (iov_record[orig_iov_loc].iov_base + + per_iov_bytes); + + iov[iov_count].iov_len = (MARKER_SIZE / 2); + iov[iov_count++].iov_base = + &rx_marker_val[rx_marker_iov++]; + iov[iov_count].iov_len = (MARKER_SIZE / 2); + iov[iov_count++].iov_base = + &rx_marker_val[rx_marker_iov++]; + old_rx_marker = *rx_marker; + + /* + * OFMarkInt is in 32-bit words. + */ + *rx_marker = (conn->conn_ops->OFMarkInt * 4); + size -= old_rx_marker; + orig_iov_len -= old_rx_marker; + per_iov_bytes += old_rx_marker; + + TRACE(TRACE_SSLR, "rx_data: #3 new_rx_marker" + " %u, size %u\n", *rx_marker, size); + } else { + iov[iov_count].iov_len = orig_iov_len; + iov[iov_count++].iov_base = + (iov_record[orig_iov_loc].iov_base + + per_iov_bytes); + + per_iov_bytes = 0; + *rx_marker -= orig_iov_len; + size -= orig_iov_len; + + if (size) + orig_iov_len = + iov_record[++orig_iov_loc].iov_len; + + TRACE(TRACE_SSLR, "rx_data: #4 new_rx_marker" + " %u, size %u\n", *rx_marker, size); + } + } + data += (rx_marker_iov * (MARKER_SIZE / 2)); + + msg.msg_iov = &iov[0]; + msg.msg_iovlen = iov_count; + + if (iov_count > count->ss_iov_count) { + printk(KERN_ERR "iov_count: %d, count->ss_iov_count:" + " %d\n", iov_count, count->ss_iov_count); + return -1; + } + if (rx_marker_iov > count->ss_marker_count) { + printk(KERN_ERR "rx_marker_iov: %d, count->ss_marker" + "_count: %d\n", rx_marker_iov, + count->ss_marker_count); + return -1; + } + } else { + msg.msg_iov = count->iov; + msg.msg_iovlen = count->iov_count; + } + + while (total_rx < data) { + oldfs = get_fs(); + set_fs(get_ds()); + + conn->sock->sk->sk_allocation = GFP_ATOMIC; + rx_loop = sock_recvmsg(conn->sock, &msg, + (data - total_rx), MSG_WAITALL); + + set_fs(oldfs); + + if (rx_loop <= 0) { + TRACE(TRACE_NET, "rx_loop: %d total_rx: %d\n", + rx_loop, total_rx); + return rx_loop; + } + total_rx += rx_loop; + TRACE(TRACE_NET, "rx_loop: %d, total_rx: %d, data: %d\n", + rx_loop, total_rx, data); + } + + if (count->sync_and_steering) { + int j; + for (j = 0; j < rx_marker_iov; j++) { + TRACE(TRACE_SSLR, "rx_data: #5 j: %d, offset: %d\n", + j, rx_marker_val[j]); + conn->of_marker_offset = rx_marker_val[j]; + } + total_rx -= (rx_marker_iov * (MARKER_SIZE / 2)); + } + + return total_rx; +} + +static inline int iscsit_do_tx_data( + struct iscsi_conn *conn, + struct iscsi_data_count *count) +{ + int data = count->data_length, total_tx = 0, tx_loop = 0; + u32 tx_marker_val[count->ss_marker_count], tx_marker_iov = 0; + struct iovec iov[count->ss_iov_count]; + mm_segment_t oldfs; + struct msghdr msg; + + if (!conn || !conn->sock || !conn->conn_ops) + return -1; + + if (data <= 0) { + printk(KERN_ERR "Data length is: %d\n", data); + return -1; + } + + memset(&msg, 0, sizeof(struct msghdr)); + + if (count->sync_and_steering) { + int size = 0; + u32 i, orig_iov_count = 0; + u32 orig_iov_len = 0, orig_iov_loc = 0; + u32 iov_count = 0, per_iov_bytes = 0; + u32 *tx_marker, old_tx_marker = 0; + struct iovec *iov_record; + + memset(&tx_marker_val, 0, + count->ss_marker_count * sizeof(u32)); + memset(&iov, 0, count->ss_iov_count * sizeof(struct iovec)); + + iov_record = count->iov; + orig_iov_count = count->iov_count; + tx_marker = &conn->if_marker; + + i = 0; + size = data; + orig_iov_len = iov_record[orig_iov_loc].iov_len; + while (size > 0) { + TRACE(TRACE_SSLT, "tx_data: #1 orig_iov_len %u," + " orig_iov_loc %u\n", orig_iov_len, orig_iov_loc); + TRACE(TRACE_SSLT, "tx_data: #2 tx_marker %u, size" + " %u\n", *tx_marker, size); + + if (orig_iov_len >= *tx_marker) { + iov[iov_count].iov_len = *tx_marker; + iov[iov_count++].iov_base = + (iov_record[orig_iov_loc].iov_base + + per_iov_bytes); + + tx_marker_val[tx_marker_iov] = + (size - *tx_marker); + iov[iov_count].iov_len = (MARKER_SIZE / 2); + iov[iov_count++].iov_base = + &tx_marker_val[tx_marker_iov++]; + iov[iov_count].iov_len = (MARKER_SIZE / 2); + iov[iov_count++].iov_base = + &tx_marker_val[tx_marker_iov++]; + old_tx_marker = *tx_marker; + + /* + * IFMarkInt is in 32-bit words. + */ + *tx_marker = (conn->conn_ops->IFMarkInt * 4); + size -= old_tx_marker; + orig_iov_len -= old_tx_marker; + per_iov_bytes += old_tx_marker; + + TRACE(TRACE_SSLT, "tx_data: #3 new_tx_marker" + " %u, size %u\n", *tx_marker, size); + TRACE(TRACE_SSLT, "tx_data: #4 offset %u\n", + tx_marker_val[tx_marker_iov-1]); + } else { + iov[iov_count].iov_len = orig_iov_len; + iov[iov_count++].iov_base + = (iov_record[orig_iov_loc].iov_base + + per_iov_bytes); + + per_iov_bytes = 0; + *tx_marker -= orig_iov_len; + size -= orig_iov_len; + + if (size) + orig_iov_len = + iov_record[++orig_iov_loc].iov_len; + + TRACE(TRACE_SSLT, "tx_data: #5 new_tx_marker" + " %u, size %u\n", *tx_marker, size); + } + } + + data += (tx_marker_iov * (MARKER_SIZE / 2)); + + msg.msg_iov = &iov[0]; + msg.msg_iovlen = iov_count; + + if (iov_count > count->ss_iov_count) { + printk(KERN_ERR "iov_count: %d, count->ss_iov_count:" + " %d\n", iov_count, count->ss_iov_count); + return -1; + } + if (tx_marker_iov > count->ss_marker_count) { + printk(KERN_ERR "tx_marker_iov: %d, count->ss_marker" + "_count: %d\n", tx_marker_iov, + count->ss_marker_count); + return -1; + } + } else { + msg.msg_iov = count->iov; + msg.msg_iovlen = count->iov_count; + } + + while (total_tx < data) { + oldfs = get_fs(); + set_fs(get_ds()); + + conn->sock->sk->sk_allocation = GFP_ATOMIC; + tx_loop = sock_sendmsg(conn->sock, &msg, (data - total_tx)); + + set_fs(oldfs); + + if (tx_loop <= 0) { + TRACE(TRACE_NET, "tx_loop: %d total_tx %d\n", + tx_loop, total_tx); + return tx_loop; + } + total_tx += tx_loop; + TRACE(TRACE_NET, "tx_loop: %d, total_tx: %d, data: %d\n", + tx_loop, total_tx, data); + } + + if (count->sync_and_steering) + total_tx -= (tx_marker_iov * (MARKER_SIZE / 2)); + + return total_tx; +} + +int rx_data( + struct iscsi_conn *conn, + struct iovec *iov, + int iov_count, + int data) +{ + struct iscsi_data_count c; + + if (!conn || !conn->sock || !conn->conn_ops) + return -1; + + memset(&c, 0, sizeof(struct iscsi_data_count)); + c.iov = iov; + c.iov_count = iov_count; + c.data_length = data; + c.type = ISCSI_RX_DATA; + + if (conn->conn_ops->OFMarker && + (conn->conn_state >= TARG_CONN_STATE_LOGGED_IN)) { + if (iscsit_determine_sync_and_steering_counts(conn, &c) < 0) + return -1; + } + + return iscsit_do_rx_data(conn, &c); +} + +int tx_data( + struct iscsi_conn *conn, + struct iovec *iov, + int iov_count, + int data) +{ + struct iscsi_data_count c; + + if (!conn || !conn->sock || !conn->conn_ops) + return -1; + + memset(&c, 0, sizeof(struct iscsi_data_count)); + c.iov = iov; + c.iov_count = iov_count; + c.data_length = data; + c.type = ISCSI_TX_DATA; + + if (conn->conn_ops->IFMarker && + (conn->conn_state >= TARG_CONN_STATE_LOGGED_IN)) { + if (iscsit_determine_sync_and_steering_counts(conn, &c) < 0) + return -1; + } + + return iscsit_do_tx_data(conn, &c); +} + +void iscsit_collect_login_stats( + struct iscsi_conn *conn, + u8 status_class, + u8 status_detail) +{ + struct iscsi_param *intrname = NULL; + struct iscsi_tiqn *tiqn; + struct iscsi_login_stats *ls; + + tiqn = iscsit_snmp_get_tiqn(conn); + if (!(tiqn)) + return; + + ls = &tiqn->login_stats; + + spin_lock(&ls->lock); + if (((conn->login_ip == ls->last_intr_fail_addr) || + !(memcmp(conn->ipv6_login_ip, ls->last_intr_fail_ip6_addr, + IPV6_ADDRESS_SPACE))) && + ((get_jiffies_64() - ls->last_fail_time) < 10)) { + /* We already have the failure info for this login */ + spin_unlock(&ls->lock); + return; + } + + if (status_class == ISCSI_STATUS_CLS_SUCCESS) + ls->accepts++; + else if (status_class == ISCSI_STATUS_CLS_REDIRECT) { + ls->redirects++; + ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT; + } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && + (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) { + ls->authenticate_fails++; + ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE; + } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && + (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) { + ls->authorize_fails++; + ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE; + } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && + (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) { + ls->negotiate_fails++; + ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE; + } else { + ls->other_fails++; + ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER; + } + + /* Save initiator name, ip address and time, if it is a failed login */ + if (status_class != ISCSI_STATUS_CLS_SUCCESS) { + if (conn->param_list) + intrname = iscsi_find_param_from_key(INITIATORNAME, + conn->param_list); + strcpy(ls->last_intr_fail_name, + (intrname ? intrname->value : "Unknown")); + + if (conn->ipv6_login_ip != NULL) { + memcpy(ls->last_intr_fail_ip6_addr, + conn->ipv6_login_ip, IPV6_ADDRESS_SPACE); + ls->last_intr_fail_addr = 0; + } else { + memset(ls->last_intr_fail_ip6_addr, 0, + IPV6_ADDRESS_SPACE); + ls->last_intr_fail_addr = conn->login_ip; + } + ls->last_fail_time = get_jiffies_64(); + } + + spin_unlock(&ls->lock); +} + +struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn) +{ + struct iscsi_portal_group *tpg; + + if (!conn || !conn->sess) + return NULL; + + tpg = conn->sess->tpg; + if (!tpg) + return NULL; + + if (!tpg->tpg_tiqn) + return NULL; + + return tpg->tpg_tiqn; +} + +extern int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd) +{ + char *ip, *payload = NULL; + struct iscsi_conn *conn = cmd->conn; + struct iscsi_portal_group *tpg; + struct iscsi_tiqn *tiqn; + struct iscsi_tpg_np *tpg_np; + int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; + unsigned char buf[256]; + unsigned char buf_ipv4[IPV4_BUF_SIZE]; + + buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ? + 32768 : conn->conn_ops->MaxRecvDataSegmentLength; + + payload = kzalloc(buffer_len, GFP_KERNEL); + if (!payload) { + printk(KERN_ERR "Unable to allocate memory for sendtargets" + " response.\n"); + return -1; + } + + spin_lock(&tiqn_lock); + list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { + memset(buf, 0, 256); + + len = sprintf(buf, "TargetName=%s", tiqn->tiqn); + len += 1; + + if ((len + payload_len) > buffer_len) { + spin_unlock(&tiqn->tiqn_tpg_lock); + end_of_buf = 1; + goto eob; + } + memcpy((void *)payload + payload_len, buf, len); + payload_len += len; + + spin_lock(&tiqn->tiqn_tpg_lock); + list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { + + spin_lock(&tpg->tpg_state_lock); + if ((tpg->tpg_state == TPG_STATE_FREE) || + (tpg->tpg_state == TPG_STATE_INACTIVE)) { + spin_unlock(&tpg->tpg_state_lock); + continue; + } + spin_unlock(&tpg->tpg_state_lock); + + spin_lock(&tpg->tpg_np_lock); + list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, + tpg_np_list) { + memset(buf, 0, 256); + + if (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) { + ip = &tpg_np->tpg_np->np_ipv6[0]; + } else { + memset(buf_ipv4, 0, IPV4_BUF_SIZE); + iscsit_ntoa2(buf_ipv4, + tpg_np->tpg_np->np_ipv4); + ip = &buf_ipv4[0]; + } + + len = sprintf(buf, "TargetAddress=" + "%s%s%s:%hu,%hu", + (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ? + "[" : "", ip, + (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ? + "]" : "", tpg_np->tpg_np->np_port, + tpg->tpgt); + len += 1; + + if ((len + payload_len) > buffer_len) { + spin_unlock(&tpg->tpg_np_lock); + spin_unlock(&tiqn->tiqn_tpg_lock); + end_of_buf = 1; + goto eob; + } + + memcpy((void *)payload + payload_len, buf, len); + payload_len += len; + } + spin_unlock(&tpg->tpg_np_lock); + } + spin_unlock(&tiqn->tiqn_tpg_lock); +eob: + if (end_of_buf) + break; + } + spin_unlock(&tiqn_lock); + + cmd->buf_ptr = payload; + + return payload_len; +} diff --git a/drivers/target/iscsi/iscsi_target_util.h b/drivers/target/iscsi/iscsi_target_util.h new file mode 100644 index 0000000..991f34a --- /dev/null +++ b/drivers/target/iscsi/iscsi_target_util.h @@ -0,0 +1,118 @@ +#ifndef ISCSI_TARGET_UTIL_H +#define ISCSI_TARGET_UTIL_H + +#define MARKER_SIZE 8 + +struct se_cmd; + +struct se_offset_map { + int map_reset; + u32 iovec_length; + u32 iscsi_offset; + u32 current_offset; + u32 orig_offset; + u32 sg_count; + u32 sg_current; + u32 sg_length; + struct page *sg_page; + struct se_mem *map_se_mem; + struct se_mem *map_orig_se_mem; + void *iovec_base; +} ____cacheline_aligned; + +struct se_map_sg { + int sg_kmap_active:1; + u32 data_length; + u32 data_offset; + void *fabric_cmd; + struct se_cmd *se_cmd; + struct iovec *iov; +} ____cacheline_aligned; + +struct se_unmap_sg { + u32 data_length; + u32 sg_count; + u32 sg_offset; + u32 padding; + u32 t_offset; + void *fabric_cmd; + struct se_cmd *se_cmd; + struct se_offset_map lmap; + struct se_mem *cur_se_mem; +} ____cacheline_aligned; + +extern int iscsit_add_r2t_to_list(struct iscsi_cmd *, u32, u32, int, u32); +extern struct iscsi_r2t *iscsit_get_r2t_for_eos(struct iscsi_cmd *, u32, u32); +extern struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *); +extern void iscsit_free_r2t(struct iscsi_r2t *, struct iscsi_cmd *); +extern void iscsit_free_r2ts_from_list(struct iscsi_cmd *); +extern struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *); +extern struct iscsi_cmd *iscsit_allocate_se_cmd(struct iscsi_conn *, u32, int, int); +extern struct iscsi_cmd *iscsit_allocate_se_cmd_for_tmr(struct iscsi_conn *, u8); +extern int iscsit_decide_list_to_build(struct iscsi_cmd *, u32); +extern struct iscsi_seq *iscsit_get_seq_holder_for_datain(struct iscsi_cmd *, u32); +extern struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *); +extern struct iscsi_r2t *iscsit_get_holder_for_r2tsn(struct iscsi_cmd *, u32); +extern int iscsit_check_received_cmdsn(struct iscsi_conn *, struct iscsi_cmd *, u32); +extern int iscsit_check_unsolicited_dataout(struct iscsi_cmd *, unsigned char *); +extern struct iscsi_cmd *iscsit_find_cmd_from_itt(struct iscsi_conn *, u32); +extern struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(struct iscsi_conn *, + u32, u32); +extern struct iscsi_cmd *iscsit_find_cmd_from_ttt(struct iscsi_conn *, u32); +extern int iscsit_find_cmd_for_recovery(struct iscsi_session *, struct iscsi_cmd **, + struct iscsi_conn_recovery **, u32); +extern void iscsit_add_cmd_to_immediate_queue(struct iscsi_cmd *, struct iscsi_conn *, u8); +extern struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *); +extern void iscsit_add_cmd_to_response_queue(struct iscsi_cmd *, struct iscsi_conn *, u8); +extern struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *); +extern void iscsit_remove_cmd_from_tx_queues(struct iscsi_cmd *, struct iscsi_conn *); +extern void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *); +extern void iscsit_release_cmd_direct(struct iscsi_cmd *); +extern void __iscsit_release_cmd_to_pool(struct iscsi_cmd *, struct iscsi_session *); +extern void iscsit_release_cmd_to_pool(struct iscsi_cmd *); +extern u64 iscsit_pack_lun(unsigned int); +extern u32 iscsit_unpack_lun(unsigned char *); +extern int iscsit_check_session_usage_count(struct iscsi_session *); +extern void iscsit_dec_session_usage_count(struct iscsi_session *); +extern void iscsit_inc_session_usage_count(struct iscsi_session *); +extern int iscsit_set_sync_and_steering_values(struct iscsi_conn *); +extern unsigned char *iscsit_ntoa(u32); +extern void iscsit_ntoa2(unsigned char *, u32); +extern const char *iscsit_ntop6(const unsigned char *, char *, size_t); +extern int iscsit_pton6(const char *, unsigned char *); +extern struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *, u16); +extern struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *, u16); +extern void iscsit_check_conn_usage_count(struct iscsi_conn *); +extern void iscsit_dec_conn_usage_count(struct iscsi_conn *); +extern void iscsit_inc_conn_usage_count(struct iscsi_conn *); +extern int iscsit_check_for_active_network_device(struct iscsi_conn *); +extern void iscsit_get_network_interface_from_conn(struct iscsi_conn *); +extern void iscsit_start_netif_timer(struct iscsi_conn *); +extern void iscsit_stop_netif_timer(struct iscsi_conn *); +extern void iscsit_mod_nopin_response_timer(struct iscsi_conn *); +extern void iscsit_start_nopin_response_timer(struct iscsi_conn *); +extern void iscsit_stop_nopin_response_timer(struct iscsi_conn *); +extern void __iscsit_start_nopin_timer(struct iscsi_conn *); +extern void iscsit_start_nopin_timer(struct iscsi_conn *); +extern void iscsit_stop_nopin_timer(struct iscsi_conn *); +extern int iscsit_send_tx_data(struct iscsi_cmd *, struct iscsi_conn *, int); +extern int iscsit_fe_sendpage_sg(struct se_unmap_sg *, struct iscsi_conn *); +extern int iscsit_tx_login_rsp(struct iscsi_conn *, u8, u8); +extern void iscsit_print_session_params(struct iscsi_session *); +extern int iscsit_print_dev_to_proc(char *, char **, off_t, int); +extern int iscsit_print_sessions_to_proc(char *, char **, off_t, int); +extern int iscsit_print_tpg_to_proc(char *, char **, off_t, int); +extern int rx_data(struct iscsi_conn *, struct iovec *, int, int); +extern int tx_data(struct iscsi_conn *, struct iovec *, int, int); +extern void iscsit_collect_login_stats(struct iscsi_conn *, u8, u8); +extern struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *); +extern int iscsit_build_sendtargets_response(struct iscsi_cmd *); + +extern struct target_fabric_configfs *lio_target_fabric_configfs; +extern struct iscsi_global *iscsi_global; +extern struct kmem_cache *lio_cmd_cache; +extern struct kmem_cache *lio_qr_cache; +extern struct kmem_cache *lio_r2t_cache; + +#endif /*** ISCSI_TARGET_UTIL_H ***/ + -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/