3bbaaad95f
bnx2i needs to send a hardware specific cleanup command if a command has not completed normally (iscsi/scsi response from target), and the session is still ok (this is the case when we send a TMF to stop the command). At this time it will need to drop the session lock. The problem with the current code is that fail_all_commands assumes we will hold the lock the entire time, so it uses list_for_each_entry_safe. If while bnx2i drops the session lock multiple cmds complete then list_for_each_entry_safe will not handle this correctly. This patch removes the running lists and just has us loop over the cmds array (in later patches we will then replace that array with a block tag map at the session level). It also fixes up the completion path so that if the TMF code and the normal recv path were completing the same command then they both do not try to do release the refcount taken when the task is queued. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
438 lines
12 KiB
C
438 lines
12 KiB
C
/*
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* iSCSI lib definitions
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*
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* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
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* Copyright (C) 2004 - 2006 Mike Christie
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* Copyright (C) 2004 - 2005 Dmitry Yusupov
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* Copyright (C) 2004 - 2005 Alex Aizman
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef LIBISCSI_H
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#define LIBISCSI_H
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#include <linux/types.h>
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#include <linux/wait.h>
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#include <linux/mutex.h>
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#include <linux/timer.h>
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#include <linux/workqueue.h>
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#include <scsi/iscsi_proto.h>
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#include <scsi/iscsi_if.h>
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#include <scsi/scsi_transport_iscsi.h>
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struct scsi_transport_template;
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struct scsi_host_template;
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struct scsi_device;
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struct Scsi_Host;
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struct scsi_target;
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struct scsi_cmnd;
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struct socket;
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struct iscsi_transport;
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struct iscsi_cls_session;
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struct iscsi_cls_conn;
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struct iscsi_session;
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struct iscsi_nopin;
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struct device;
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#define ISCSI_DEF_XMIT_CMDS_MAX 128 /* must be power of 2 */
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#define ISCSI_MGMT_CMDS_MAX 15
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#define ISCSI_DEF_CMD_PER_LUN 32
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/* Task Mgmt states */
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enum {
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TMF_INITIAL,
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TMF_QUEUED,
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TMF_SUCCESS,
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TMF_FAILED,
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TMF_TIMEDOUT,
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TMF_NOT_FOUND,
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};
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/* Connection suspend "bit" */
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#define ISCSI_SUSPEND_BIT 1
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#define ISCSI_ITT_MASK 0x1fff
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#define ISCSI_TOTAL_CMDS_MAX 4096
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/* this must be a power of two greater than ISCSI_MGMT_CMDS_MAX */
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#define ISCSI_TOTAL_CMDS_MIN 16
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#define ISCSI_AGE_SHIFT 28
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#define ISCSI_AGE_MASK 0xf
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#define ISCSI_ADDRESS_BUF_LEN 64
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enum {
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/* this is the maximum possible storage for AHSs */
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ISCSI_MAX_AHS_SIZE = sizeof(struct iscsi_ecdb_ahdr) +
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sizeof(struct iscsi_rlength_ahdr),
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ISCSI_DIGEST_SIZE = sizeof(__u32),
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};
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enum {
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ISCSI_TASK_FREE,
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ISCSI_TASK_COMPLETED,
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ISCSI_TASK_PENDING,
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ISCSI_TASK_RUNNING,
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};
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struct iscsi_r2t_info {
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__be32 ttt; /* copied from R2T */
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__be32 exp_statsn; /* copied from R2T */
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uint32_t data_length; /* copied from R2T */
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uint32_t data_offset; /* copied from R2T */
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int data_count; /* DATA-Out payload progress */
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int datasn;
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/* LLDs should set/update these values */
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int sent; /* R2T sequence progress */
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};
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struct iscsi_task {
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/*
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* Because LLDs allocate their hdr differently, this is a pointer
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* and length to that storage. It must be setup at session
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* creation time.
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*/
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struct iscsi_hdr *hdr;
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unsigned short hdr_max;
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unsigned short hdr_len; /* accumulated size of hdr used */
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/* copied values in case we need to send tmfs */
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itt_t hdr_itt;
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__be32 cmdsn;
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uint8_t lun[8];
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int itt; /* this ITT */
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unsigned imm_count; /* imm-data (bytes) */
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/* offset in unsolicited stream (bytes); */
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struct iscsi_r2t_info unsol_r2t;
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char *data; /* mgmt payload */
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unsigned data_count;
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struct scsi_cmnd *sc; /* associated SCSI cmd*/
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struct iscsi_conn *conn; /* used connection */
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/* state set/tested under session->lock */
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int state;
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atomic_t refcount;
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struct list_head running; /* running cmd list */
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void *dd_data; /* driver/transport data */
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};
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static inline int iscsi_task_has_unsol_data(struct iscsi_task *task)
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{
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return task->unsol_r2t.data_length > task->unsol_r2t.sent;
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}
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static inline void* iscsi_next_hdr(struct iscsi_task *task)
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{
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return (void*)task->hdr + task->hdr_len;
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}
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/* Connection's states */
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enum {
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ISCSI_CONN_INITIAL_STAGE,
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ISCSI_CONN_STARTED,
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ISCSI_CONN_STOPPED,
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ISCSI_CONN_CLEANUP_WAIT,
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};
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struct iscsi_conn {
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struct iscsi_cls_conn *cls_conn; /* ptr to class connection */
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void *dd_data; /* iscsi_transport data */
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struct iscsi_session *session; /* parent session */
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/*
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* conn_stop() flag: stop to recover, stop to terminate
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*/
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int stop_stage;
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struct timer_list transport_timer;
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unsigned long last_recv;
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unsigned long last_ping;
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int ping_timeout;
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int recv_timeout;
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struct iscsi_task *ping_task;
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/* iSCSI connection-wide sequencing */
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uint32_t exp_statsn;
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/* control data */
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int id; /* CID */
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int c_stage; /* connection state */
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/*
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* Preallocated buffer for pdus that have data but do not
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* originate from scsi-ml. We never have two pdus using the
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* buffer at the same time. It is only allocated to
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* the default max recv size because the pdus we support
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* should always fit in this buffer
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*/
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char *data;
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struct iscsi_task *login_task; /* mtask used for login/text */
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struct iscsi_task *task; /* xmit task in progress */
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/* xmit */
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struct list_head mgmtqueue; /* mgmt (control) xmit queue */
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struct list_head cmdqueue; /* data-path cmd queue */
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struct list_head requeue; /* tasks needing another run */
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struct work_struct xmitwork; /* per-conn. xmit workqueue */
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unsigned long suspend_tx; /* suspend Tx */
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unsigned long suspend_rx; /* suspend Rx */
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/* abort */
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wait_queue_head_t ehwait; /* used in eh_abort() */
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struct iscsi_tm tmhdr;
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struct timer_list tmf_timer;
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int tmf_state; /* see TMF_INITIAL, etc.*/
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/* negotiated params */
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unsigned max_recv_dlength; /* initiator_max_recv_dsl*/
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unsigned max_xmit_dlength; /* target_max_recv_dsl */
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int hdrdgst_en;
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int datadgst_en;
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int ifmarker_en;
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int ofmarker_en;
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/* values userspace uses to id a conn */
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int persistent_port;
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char *persistent_address;
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/* remote portal currently connected to */
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int portal_port;
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char portal_address[ISCSI_ADDRESS_BUF_LEN];
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/* MIB-statistics */
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uint64_t txdata_octets;
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uint64_t rxdata_octets;
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uint32_t scsicmd_pdus_cnt;
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uint32_t dataout_pdus_cnt;
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uint32_t scsirsp_pdus_cnt;
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uint32_t datain_pdus_cnt;
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uint32_t r2t_pdus_cnt;
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uint32_t tmfcmd_pdus_cnt;
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int32_t tmfrsp_pdus_cnt;
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/* custom statistics */
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uint32_t eh_abort_cnt;
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uint32_t fmr_unalign_cnt;
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};
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struct iscsi_pool {
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struct kfifo *queue; /* FIFO Queue */
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void **pool; /* Pool of elements */
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int max; /* Max number of elements */
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};
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/* Session's states */
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enum {
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ISCSI_STATE_FREE = 1,
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ISCSI_STATE_LOGGED_IN,
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ISCSI_STATE_FAILED,
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ISCSI_STATE_TERMINATE,
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ISCSI_STATE_IN_RECOVERY,
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ISCSI_STATE_RECOVERY_FAILED,
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ISCSI_STATE_LOGGING_OUT,
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};
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struct iscsi_session {
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struct iscsi_cls_session *cls_session;
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/*
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* Syncs up the scsi eh thread with the iscsi eh thread when sending
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* task management functions. This must be taken before the session
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* and recv lock.
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*/
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struct mutex eh_mutex;
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/* iSCSI session-wide sequencing */
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uint32_t cmdsn;
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uint32_t exp_cmdsn;
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uint32_t max_cmdsn;
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/* This tracks the reqs queued into the initiator */
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uint32_t queued_cmdsn;
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/* configuration */
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int abort_timeout;
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int lu_reset_timeout;
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int initial_r2t_en;
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unsigned max_r2t;
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int imm_data_en;
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unsigned first_burst;
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unsigned max_burst;
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int time2wait;
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int time2retain;
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int pdu_inorder_en;
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int dataseq_inorder_en;
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int erl;
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int fast_abort;
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int tpgt;
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char *username;
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char *username_in;
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char *password;
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char *password_in;
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char *targetname;
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char *ifacename;
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char *initiatorname;
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/* control data */
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struct iscsi_transport *tt;
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struct Scsi_Host *host;
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struct iscsi_conn *leadconn; /* leading connection */
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spinlock_t lock; /* protects session state, *
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* sequence numbers, *
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* session resources: *
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* - cmdpool, *
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* - mgmtpool, *
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* - r2tpool */
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int state; /* session state */
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int age; /* counts session re-opens */
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int scsi_cmds_max; /* max scsi commands */
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int cmds_max; /* size of cmds array */
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struct iscsi_task **cmds; /* Original Cmds arr */
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struct iscsi_pool cmdpool; /* PDU's pool */
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};
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enum {
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ISCSI_HOST_SETUP,
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ISCSI_HOST_REMOVED,
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};
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struct iscsi_host {
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char *initiatorname;
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/* hw address or netdev iscsi connection is bound to */
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char *hwaddress;
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char *netdev;
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/* local address */
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int local_port;
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char local_address[ISCSI_ADDRESS_BUF_LEN];
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wait_queue_head_t session_removal_wq;
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/* protects sessions and state */
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spinlock_t lock;
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int num_sessions;
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int state;
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struct workqueue_struct *workq;
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char workq_name[20];
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};
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/*
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* scsi host template
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*/
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extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth);
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extern int iscsi_eh_abort(struct scsi_cmnd *sc);
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extern int iscsi_eh_target_reset(struct scsi_cmnd *sc);
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extern int iscsi_eh_device_reset(struct scsi_cmnd *sc);
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extern int iscsi_queuecommand(struct scsi_cmnd *sc,
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void (*done)(struct scsi_cmnd *));
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/*
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* iSCSI host helpers.
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*/
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#define iscsi_host_priv(_shost) \
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(shost_priv(_shost) + sizeof(struct iscsi_host))
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extern int iscsi_host_set_param(struct Scsi_Host *shost,
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enum iscsi_host_param param, char *buf,
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int buflen);
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extern int iscsi_host_get_param(struct Scsi_Host *shost,
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enum iscsi_host_param param, char *buf);
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extern int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev);
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extern struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
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int dd_data_size,
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bool xmit_can_sleep);
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extern void iscsi_host_remove(struct Scsi_Host *shost);
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extern void iscsi_host_free(struct Scsi_Host *shost);
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extern int iscsi_target_alloc(struct scsi_target *starget);
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/*
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* session management
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*/
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extern struct iscsi_cls_session *
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iscsi_session_setup(struct iscsi_transport *, struct Scsi_Host *shost,
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uint16_t, int, uint32_t, unsigned int);
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extern void iscsi_session_teardown(struct iscsi_cls_session *);
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extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
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extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
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enum iscsi_param param, char *buf, int buflen);
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extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
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enum iscsi_param param, char *buf);
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#define iscsi_session_printk(prefix, _sess, fmt, a...) \
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iscsi_cls_session_printk(prefix, _sess->cls_session, fmt, ##a)
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/*
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* connection management
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*/
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extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *,
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int, uint32_t);
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extern void iscsi_conn_teardown(struct iscsi_cls_conn *);
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extern int iscsi_conn_start(struct iscsi_cls_conn *);
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extern void iscsi_conn_stop(struct iscsi_cls_conn *, int);
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extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *,
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int);
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extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err);
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extern void iscsi_session_failure(struct iscsi_session *session,
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enum iscsi_err err);
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extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
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enum iscsi_param param, char *buf);
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extern void iscsi_suspend_tx(struct iscsi_conn *conn);
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extern void iscsi_conn_queue_work(struct iscsi_conn *conn);
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#define iscsi_conn_printk(prefix, _c, fmt, a...) \
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iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \
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fmt, ##a)
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/*
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* pdu and task processing
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*/
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extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *);
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extern void iscsi_prep_data_out_pdu(struct iscsi_task *task,
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struct iscsi_r2t_info *r2t,
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struct iscsi_data *hdr);
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extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *,
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char *, uint32_t);
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extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
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char *, int);
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extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
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char *, int);
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extern int iscsi_verify_itt(struct iscsi_conn *, itt_t);
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extern struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *, itt_t);
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extern struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *, itt_t);
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extern void iscsi_requeue_task(struct iscsi_task *task);
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extern void iscsi_put_task(struct iscsi_task *task);
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extern void __iscsi_get_task(struct iscsi_task *task);
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/*
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* generic helpers
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*/
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extern void iscsi_pool_free(struct iscsi_pool *);
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extern int iscsi_pool_init(struct iscsi_pool *, int, void ***, int);
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/*
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* inline functions to deal with padding.
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*/
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static inline unsigned int
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iscsi_padded(unsigned int len)
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{
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return (len + ISCSI_PAD_LEN - 1) & ~(ISCSI_PAD_LEN - 1);
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}
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static inline unsigned int
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iscsi_padding(unsigned int len)
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{
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len &= (ISCSI_PAD_LEN - 1);
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if (len)
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len = ISCSI_PAD_LEN - len;
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return len;
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}
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#endif
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