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![Kyle Fortin](/assets/img/avatar_default.png)
iscsiadm session login can fail with the following error: iscsiadm: Could not login to [iface: default, target: iqn.1986-03.com... iscsiadm: initiator reported error (9 - internal error) When /etc/iscsi/iscsid.conf sets node.session.cmds_max = 4096, it results in 64K-sized kmallocs per session. A system under fragmented slab pressure may not have any 64K objects available and fail iscsiadm session login. Even though memory objects of a smaller size are available, the large order allocation ends up failing. The kernel prints a warning and does dump_stack, like below: iscsid: page allocation failure: order:4, mode:0xc0d0 CPU: 0 PID: 2456 Comm: iscsid Not tainted 4.1.12-61.1.28.el6uek.x86_64 #2 Call Trace: [<ffffffff816c6e40>] dump_stack+0x63/0x83 [<ffffffff8118e58a>] warn_alloc_failed+0xea/0x140 [<ffffffff81191df9>] __alloc_pages_slowpath+0x409/0x760 [<ffffffff81192401>] __alloc_pages_nodemask+0x2b1/0x2d0 [<ffffffffa048f6c0>] ? dev_attr_host_ipaddress+0x20/0xffffffffffffc722 [<ffffffff811dc38f>] alloc_pages_current+0xaf/0x170 [<ffffffff81192581>] alloc_kmem_pages+0x31/0xd0 [<ffffffffa048f600>] ? iscsi_transport_group+0x20/0xffffffffffffc7e2 [<ffffffff811ad738>] kmalloc_order+0x18/0x50 [<ffffffff811ad7a4>] kmalloc_order_trace+0x34/0xe0 [<ffffffff8146ee30>] ? transport_remove_classdev+0x70/0x70 [<ffffffff811e843d>] __kmalloc+0x27d/0x2a0 [<ffffffff810c8cbd>] ? complete_all+0x4d/0x60 [<ffffffffa04af299>] iscsi_pool_init+0x69/0x160 [libiscsi] [<ffffffff81465d90>] ? device_initialize+0xb0/0xd0 [<ffffffffa04af510>] iscsi_session_setup+0x180/0x2f4 [libiscsi] [<ffffffffa04c5a60>] ? iscsi_max_lun+0x20/0xfffffffffffffa9e [iscsi_tcp] [<ffffffffa04c531f>] iscsi_sw_tcp_session_create+0xcf/0x150 [iscsi_tcp] [<ffffffffa04c5a60>] ? iscsi_max_lun+0x20/0xfffffffffffffa9e [iscsi_tcp] [<ffffffffa048a633>] iscsi_if_create_session+0x33/0xd0 [<ffffffffa04c5a60>] ? iscsi_max_lun+0x20/0xfffffffffffffa9e [iscsi_tcp] [<ffffffffa048abd8>] iscsi_if_recv_msg+0x508/0x8c0 [scsi_transport_iscsi] [<ffffffff811922eb>] ? __alloc_pages_nodemask+0x19b/0x2d0 [<ffffffff811e6d69>] ? __kmalloc_node_track_caller+0x209/0x2c0 [<ffffffffa048b00c>] iscsi_if_rx+0x7c/0x200 [scsi_transport_iscsi] [<ffffffff81623dc6>] netlink_unicast+0x126/0x1c0 [<ffffffff8162468c>] netlink_sendmsg+0x36c/0x400 [<ffffffff815d2fed>] sock_sendmsg+0x4d/0x60 [<ffffffff815d596a>] ___sys_sendmsg+0x30a/0x330 [<ffffffff811bc72c>] ? handle_pte_fault+0x20c/0x230 [<ffffffff811bc90c>] ? __handle_mm_fault+0x1bc/0x330 [<ffffffff811bcb32>] ? handle_mm_fault+0xb2/0x1a0 [<ffffffff815d5b99>] __sys_sendmsg+0x49/0x90 [<ffffffff815d5bf9>] SyS_sendmsg+0x19/0x20 [<ffffffff816cbb2e>] system_call_fastpath+0x12/0x71 Use kvzalloc for iscsi_pool in iscsi_pool_init. Signed-off-by: Kyle Fortin <kyle.fortin@oracle.com> Tested-by: Kyle Fortin <kyle.fortin@oracle.com> Reviewed-by: Joseph Slember <joe.slember@oracle.com> Reviewed-by: Lance Hartmann <lance.hartmann@oracle.com> Acked-by: Lee Duncan <lduncan@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
3651 lines
97 KiB
C
3651 lines
97 KiB
C
/*
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* iSCSI lib functions
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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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* maintained by open-iscsi@googlegroups.com
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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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#include <linux/types.h>
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#include <linux/kfifo.h>
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#include <linux/delay.h>
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#include <linux/log2.h>
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#include <linux/slab.h>
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#include <linux/sched/signal.h>
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#include <linux/module.h>
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#include <asm/unaligned.h>
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#include <net/tcp.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi.h>
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#include <scsi/iscsi_proto.h>
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_transport_iscsi.h>
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#include <scsi/libiscsi.h>
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static int iscsi_dbg_lib_conn;
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module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
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S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug_libiscsi_conn,
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"Turn on debugging for connections in libiscsi module. "
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"Set to 1 to turn on, and zero to turn off. Default is off.");
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static int iscsi_dbg_lib_session;
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module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
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S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug_libiscsi_session,
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"Turn on debugging for sessions in libiscsi module. "
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"Set to 1 to turn on, and zero to turn off. Default is off.");
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static int iscsi_dbg_lib_eh;
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module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
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S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug_libiscsi_eh,
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"Turn on debugging for error handling in libiscsi module. "
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"Set to 1 to turn on, and zero to turn off. Default is off.");
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#define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
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do { \
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if (iscsi_dbg_lib_conn) \
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iscsi_conn_printk(KERN_INFO, _conn, \
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"%s " dbg_fmt, \
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__func__, ##arg); \
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} while (0);
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#define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
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do { \
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if (iscsi_dbg_lib_session) \
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iscsi_session_printk(KERN_INFO, _session, \
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"%s " dbg_fmt, \
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__func__, ##arg); \
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} while (0);
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#define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
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do { \
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if (iscsi_dbg_lib_eh) \
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iscsi_session_printk(KERN_INFO, _session, \
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"%s " dbg_fmt, \
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__func__, ##arg); \
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} while (0);
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inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
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{
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struct Scsi_Host *shost = conn->session->host;
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struct iscsi_host *ihost = shost_priv(shost);
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if (ihost->workq)
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queue_work(ihost->workq, &conn->xmitwork);
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}
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EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
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static void __iscsi_update_cmdsn(struct iscsi_session *session,
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uint32_t exp_cmdsn, uint32_t max_cmdsn)
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{
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/*
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* standard specifies this check for when to update expected and
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* max sequence numbers
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*/
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if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
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return;
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if (exp_cmdsn != session->exp_cmdsn &&
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!iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
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session->exp_cmdsn = exp_cmdsn;
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if (max_cmdsn != session->max_cmdsn &&
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!iscsi_sna_lt(max_cmdsn, session->max_cmdsn))
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session->max_cmdsn = max_cmdsn;
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}
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void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
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{
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__iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
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be32_to_cpu(hdr->max_cmdsn));
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}
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EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
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/**
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* iscsi_prep_data_out_pdu - initialize Data-Out
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* @task: scsi command task
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* @r2t: R2T info
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* @hdr: iscsi data in pdu
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*
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* Notes:
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* Initialize Data-Out within this R2T sequence and finds
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* proper data_offset within this SCSI command.
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*
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* This function is called with connection lock taken.
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**/
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void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
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struct iscsi_data *hdr)
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{
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struct iscsi_conn *conn = task->conn;
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unsigned int left = r2t->data_length - r2t->sent;
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task->hdr_len = sizeof(struct iscsi_data);
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memset(hdr, 0, sizeof(struct iscsi_data));
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hdr->ttt = r2t->ttt;
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hdr->datasn = cpu_to_be32(r2t->datasn);
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r2t->datasn++;
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hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
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hdr->lun = task->lun;
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hdr->itt = task->hdr_itt;
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hdr->exp_statsn = r2t->exp_statsn;
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hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
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if (left > conn->max_xmit_dlength) {
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hton24(hdr->dlength, conn->max_xmit_dlength);
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r2t->data_count = conn->max_xmit_dlength;
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hdr->flags = 0;
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} else {
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hton24(hdr->dlength, left);
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r2t->data_count = left;
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hdr->flags = ISCSI_FLAG_CMD_FINAL;
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}
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conn->dataout_pdus_cnt++;
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}
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EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
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static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
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{
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unsigned exp_len = task->hdr_len + len;
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if (exp_len > task->hdr_max) {
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WARN_ON(1);
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return -EINVAL;
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}
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WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
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task->hdr_len = exp_len;
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return 0;
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}
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/*
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* make an extended cdb AHS
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*/
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static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
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{
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struct scsi_cmnd *cmd = task->sc;
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unsigned rlen, pad_len;
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unsigned short ahslength;
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struct iscsi_ecdb_ahdr *ecdb_ahdr;
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int rc;
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ecdb_ahdr = iscsi_next_hdr(task);
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rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
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BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
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ahslength = rlen + sizeof(ecdb_ahdr->reserved);
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pad_len = iscsi_padding(rlen);
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rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
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sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
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if (rc)
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return rc;
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if (pad_len)
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memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
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ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
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ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
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ecdb_ahdr->reserved = 0;
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memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
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ISCSI_DBG_SESSION(task->conn->session,
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"iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
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"rlen %d pad_len %d ahs_length %d iscsi_headers_size "
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"%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
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task->hdr_len);
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return 0;
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}
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static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
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{
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struct scsi_cmnd *sc = task->sc;
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struct iscsi_rlength_ahdr *rlen_ahdr;
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int rc;
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rlen_ahdr = iscsi_next_hdr(task);
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rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
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if (rc)
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return rc;
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rlen_ahdr->ahslength =
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cpu_to_be16(sizeof(rlen_ahdr->read_length) +
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sizeof(rlen_ahdr->reserved));
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rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
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rlen_ahdr->reserved = 0;
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rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
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ISCSI_DBG_SESSION(task->conn->session,
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"bidi-in rlen_ahdr->read_length(%d) "
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"rlen_ahdr->ahslength(%d)\n",
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be32_to_cpu(rlen_ahdr->read_length),
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be16_to_cpu(rlen_ahdr->ahslength));
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return 0;
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}
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/**
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* iscsi_check_tmf_restrictions - check if a task is affected by TMF
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* @task: iscsi task
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* @opcode: opcode to check for
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*
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* During TMF a task has to be checked if it's affected.
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* All unrelated I/O can be passed through, but I/O to the
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* affected LUN should be restricted.
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* If 'fast_abort' is set we won't be sending any I/O to the
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* affected LUN.
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* Otherwise the target is waiting for all TTTs to be completed,
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* so we have to send all outstanding Data-Out PDUs to the target.
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*/
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static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
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{
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struct iscsi_conn *conn = task->conn;
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struct iscsi_tm *tmf = &conn->tmhdr;
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u64 hdr_lun;
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if (conn->tmf_state == TMF_INITIAL)
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return 0;
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if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
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return 0;
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switch (ISCSI_TM_FUNC_VALUE(tmf)) {
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case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
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/*
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* Allow PDUs for unrelated LUNs
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*/
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hdr_lun = scsilun_to_int(&tmf->lun);
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if (hdr_lun != task->sc->device->lun)
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return 0;
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/* fall through */
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case ISCSI_TM_FUNC_TARGET_WARM_RESET:
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/*
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* Fail all SCSI cmd PDUs
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*/
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if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
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iscsi_conn_printk(KERN_INFO, conn,
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"task [op %x/%x itt "
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"0x%x/0x%x] "
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"rejected.\n",
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task->hdr->opcode, opcode,
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task->itt, task->hdr_itt);
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return -EACCES;
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}
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/*
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* And also all data-out PDUs in response to R2T
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* if fast_abort is set.
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*/
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if (conn->session->fast_abort) {
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iscsi_conn_printk(KERN_INFO, conn,
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"task [op %x/%x itt "
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"0x%x/0x%x] fast abort.\n",
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task->hdr->opcode, opcode,
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task->itt, task->hdr_itt);
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return -EACCES;
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}
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break;
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case ISCSI_TM_FUNC_ABORT_TASK:
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/*
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* the caller has already checked if the task
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* they want to abort was in the pending queue so if
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* we are here the cmd pdu has gone out already, and
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* we will only hit this for data-outs
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*/
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if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
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task->hdr_itt == tmf->rtt) {
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ISCSI_DBG_SESSION(conn->session,
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"Preventing task %x/%x from sending "
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"data-out due to abort task in "
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"progress\n", task->itt,
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task->hdr_itt);
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return -EACCES;
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}
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break;
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}
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return 0;
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}
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/**
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* iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
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* @task: iscsi task
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*
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* Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
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* fields like dlength or final based on how much data it sends
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*/
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static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
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{
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struct iscsi_conn *conn = task->conn;
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struct iscsi_session *session = conn->session;
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struct scsi_cmnd *sc = task->sc;
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struct iscsi_scsi_req *hdr;
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unsigned hdrlength, cmd_len, transfer_length;
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itt_t itt;
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int rc;
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rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
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if (rc)
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return rc;
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if (conn->session->tt->alloc_pdu) {
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rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
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if (rc)
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return rc;
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}
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hdr = (struct iscsi_scsi_req *)task->hdr;
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itt = hdr->itt;
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memset(hdr, 0, sizeof(*hdr));
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if (session->tt->parse_pdu_itt)
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hdr->itt = task->hdr_itt = itt;
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else
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hdr->itt = task->hdr_itt = build_itt(task->itt,
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task->conn->session->age);
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task->hdr_len = 0;
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rc = iscsi_add_hdr(task, sizeof(*hdr));
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if (rc)
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return rc;
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hdr->opcode = ISCSI_OP_SCSI_CMD;
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hdr->flags = ISCSI_ATTR_SIMPLE;
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int_to_scsilun(sc->device->lun, &hdr->lun);
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task->lun = hdr->lun;
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hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
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cmd_len = sc->cmd_len;
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if (cmd_len < ISCSI_CDB_SIZE)
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memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
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else if (cmd_len > ISCSI_CDB_SIZE) {
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rc = iscsi_prep_ecdb_ahs(task);
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if (rc)
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return rc;
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cmd_len = ISCSI_CDB_SIZE;
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}
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memcpy(hdr->cdb, sc->cmnd, cmd_len);
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task->imm_count = 0;
|
|
if (scsi_bidi_cmnd(sc)) {
|
|
hdr->flags |= ISCSI_FLAG_CMD_READ;
|
|
rc = iscsi_prep_bidi_ahs(task);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
|
|
task->protected = true;
|
|
|
|
transfer_length = scsi_transfer_length(sc);
|
|
hdr->data_length = cpu_to_be32(transfer_length);
|
|
if (sc->sc_data_direction == DMA_TO_DEVICE) {
|
|
struct iscsi_r2t_info *r2t = &task->unsol_r2t;
|
|
|
|
hdr->flags |= ISCSI_FLAG_CMD_WRITE;
|
|
/*
|
|
* Write counters:
|
|
*
|
|
* imm_count bytes to be sent right after
|
|
* SCSI PDU Header
|
|
*
|
|
* unsol_count bytes(as Data-Out) to be sent
|
|
* without R2T ack right after
|
|
* immediate data
|
|
*
|
|
* r2t data_length bytes to be sent via R2T ack's
|
|
*
|
|
* pad_count bytes to be sent as zero-padding
|
|
*/
|
|
memset(r2t, 0, sizeof(*r2t));
|
|
|
|
if (session->imm_data_en) {
|
|
if (transfer_length >= session->first_burst)
|
|
task->imm_count = min(session->first_burst,
|
|
conn->max_xmit_dlength);
|
|
else
|
|
task->imm_count = min(transfer_length,
|
|
conn->max_xmit_dlength);
|
|
hton24(hdr->dlength, task->imm_count);
|
|
} else
|
|
zero_data(hdr->dlength);
|
|
|
|
if (!session->initial_r2t_en) {
|
|
r2t->data_length = min(session->first_burst,
|
|
transfer_length) -
|
|
task->imm_count;
|
|
r2t->data_offset = task->imm_count;
|
|
r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
|
|
r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
|
|
}
|
|
|
|
if (!task->unsol_r2t.data_length)
|
|
/* No unsolicit Data-Out's */
|
|
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
|
|
} else {
|
|
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
|
|
zero_data(hdr->dlength);
|
|
|
|
if (sc->sc_data_direction == DMA_FROM_DEVICE)
|
|
hdr->flags |= ISCSI_FLAG_CMD_READ;
|
|
}
|
|
|
|
/* calculate size of additional header segments (AHSs) */
|
|
hdrlength = task->hdr_len - sizeof(*hdr);
|
|
|
|
WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
|
|
hdrlength /= ISCSI_PAD_LEN;
|
|
|
|
WARN_ON(hdrlength >= 256);
|
|
hdr->hlength = hdrlength & 0xFF;
|
|
hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
|
|
|
|
if (session->tt->init_task && session->tt->init_task(task))
|
|
return -EIO;
|
|
|
|
task->state = ISCSI_TASK_RUNNING;
|
|
session->cmdsn++;
|
|
|
|
conn->scsicmd_pdus_cnt++;
|
|
ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
|
|
"itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
|
|
scsi_bidi_cmnd(sc) ? "bidirectional" :
|
|
sc->sc_data_direction == DMA_TO_DEVICE ?
|
|
"write" : "read", conn->id, sc, sc->cmnd[0],
|
|
task->itt, transfer_length,
|
|
scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
|
|
session->cmdsn,
|
|
session->max_cmdsn - session->exp_cmdsn + 1);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iscsi_free_task - free a task
|
|
* @task: iscsi cmd task
|
|
*
|
|
* Must be called with session back_lock.
|
|
* This function returns the scsi command to scsi-ml or cleans
|
|
* up mgmt tasks then returns the task to the pool.
|
|
*/
|
|
static void iscsi_free_task(struct iscsi_task *task)
|
|
{
|
|
struct iscsi_conn *conn = task->conn;
|
|
struct iscsi_session *session = conn->session;
|
|
struct scsi_cmnd *sc = task->sc;
|
|
int oldstate = task->state;
|
|
|
|
ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
|
|
task->itt, task->state, task->sc);
|
|
|
|
session->tt->cleanup_task(task);
|
|
task->state = ISCSI_TASK_FREE;
|
|
task->sc = NULL;
|
|
/*
|
|
* login task is preallocated so do not free
|
|
*/
|
|
if (conn->login_task == task)
|
|
return;
|
|
|
|
kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
|
|
|
|
if (sc) {
|
|
/* SCSI eh reuses commands to verify us */
|
|
sc->SCp.ptr = NULL;
|
|
/*
|
|
* queue command may call this to free the task, so
|
|
* it will decide how to return sc to scsi-ml.
|
|
*/
|
|
if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
|
|
sc->scsi_done(sc);
|
|
}
|
|
}
|
|
|
|
void __iscsi_get_task(struct iscsi_task *task)
|
|
{
|
|
refcount_inc(&task->refcount);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__iscsi_get_task);
|
|
|
|
void __iscsi_put_task(struct iscsi_task *task)
|
|
{
|
|
if (refcount_dec_and_test(&task->refcount))
|
|
iscsi_free_task(task);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__iscsi_put_task);
|
|
|
|
void iscsi_put_task(struct iscsi_task *task)
|
|
{
|
|
struct iscsi_session *session = task->conn->session;
|
|
|
|
/* regular RX path uses back_lock */
|
|
spin_lock_bh(&session->back_lock);
|
|
__iscsi_put_task(task);
|
|
spin_unlock_bh(&session->back_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_put_task);
|
|
|
|
/**
|
|
* iscsi_complete_task - finish a task
|
|
* @task: iscsi cmd task
|
|
* @state: state to complete task with
|
|
*
|
|
* Must be called with session back_lock.
|
|
*/
|
|
static void iscsi_complete_task(struct iscsi_task *task, int state)
|
|
{
|
|
struct iscsi_conn *conn = task->conn;
|
|
|
|
ISCSI_DBG_SESSION(conn->session,
|
|
"complete task itt 0x%x state %d sc %p\n",
|
|
task->itt, task->state, task->sc);
|
|
if (task->state == ISCSI_TASK_COMPLETED ||
|
|
task->state == ISCSI_TASK_ABRT_TMF ||
|
|
task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
|
|
task->state == ISCSI_TASK_REQUEUE_SCSIQ)
|
|
return;
|
|
WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
|
|
task->state = state;
|
|
|
|
spin_lock_bh(&conn->taskqueuelock);
|
|
if (!list_empty(&task->running)) {
|
|
pr_debug_once("%s while task on list", __func__);
|
|
list_del_init(&task->running);
|
|
}
|
|
spin_unlock_bh(&conn->taskqueuelock);
|
|
|
|
if (conn->task == task)
|
|
conn->task = NULL;
|
|
|
|
if (conn->ping_task == task)
|
|
conn->ping_task = NULL;
|
|
|
|
/* release get from queueing */
|
|
__iscsi_put_task(task);
|
|
}
|
|
|
|
/**
|
|
* iscsi_complete_scsi_task - finish scsi task normally
|
|
* @task: iscsi task for scsi cmd
|
|
* @exp_cmdsn: expected cmd sn in cpu format
|
|
* @max_cmdsn: max cmd sn in cpu format
|
|
*
|
|
* This is used when drivers do not need or cannot perform
|
|
* lower level pdu processing.
|
|
*
|
|
* Called with session back_lock
|
|
*/
|
|
void iscsi_complete_scsi_task(struct iscsi_task *task,
|
|
uint32_t exp_cmdsn, uint32_t max_cmdsn)
|
|
{
|
|
struct iscsi_conn *conn = task->conn;
|
|
|
|
ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
|
|
|
|
conn->last_recv = jiffies;
|
|
__iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
|
|
iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
|
|
|
|
|
|
/*
|
|
* session back_lock must be held and if not called for a task that is
|
|
* still pending or from the xmit thread, then xmit thread must
|
|
* be suspended.
|
|
*/
|
|
static void fail_scsi_task(struct iscsi_task *task, int err)
|
|
{
|
|
struct iscsi_conn *conn = task->conn;
|
|
struct scsi_cmnd *sc;
|
|
int state;
|
|
|
|
/*
|
|
* if a command completes and we get a successful tmf response
|
|
* we will hit this because the scsi eh abort code does not take
|
|
* a ref to the task.
|
|
*/
|
|
sc = task->sc;
|
|
if (!sc)
|
|
return;
|
|
|
|
if (task->state == ISCSI_TASK_PENDING) {
|
|
/*
|
|
* cmd never made it to the xmit thread, so we should not count
|
|
* the cmd in the sequencing
|
|
*/
|
|
conn->session->queued_cmdsn--;
|
|
/* it was never sent so just complete like normal */
|
|
state = ISCSI_TASK_COMPLETED;
|
|
} else if (err == DID_TRANSPORT_DISRUPTED)
|
|
state = ISCSI_TASK_ABRT_SESS_RECOV;
|
|
else
|
|
state = ISCSI_TASK_ABRT_TMF;
|
|
|
|
sc->result = err << 16;
|
|
if (!scsi_bidi_cmnd(sc))
|
|
scsi_set_resid(sc, scsi_bufflen(sc));
|
|
else {
|
|
scsi_out(sc)->resid = scsi_out(sc)->length;
|
|
scsi_in(sc)->resid = scsi_in(sc)->length;
|
|
}
|
|
|
|
/* regular RX path uses back_lock */
|
|
spin_lock_bh(&conn->session->back_lock);
|
|
iscsi_complete_task(task, state);
|
|
spin_unlock_bh(&conn->session->back_lock);
|
|
}
|
|
|
|
static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
|
|
struct iscsi_task *task)
|
|
{
|
|
struct iscsi_session *session = conn->session;
|
|
struct iscsi_hdr *hdr = task->hdr;
|
|
struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
|
|
uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
|
|
|
|
if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
|
|
return -ENOTCONN;
|
|
|
|
if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
|
|
nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
|
|
/*
|
|
* pre-format CmdSN for outgoing PDU.
|
|
*/
|
|
nop->cmdsn = cpu_to_be32(session->cmdsn);
|
|
if (hdr->itt != RESERVED_ITT) {
|
|
/*
|
|
* TODO: We always use immediate for normal session pdus.
|
|
* If we start to send tmfs or nops as non-immediate then
|
|
* we should start checking the cmdsn numbers for mgmt tasks.
|
|
*
|
|
* During discovery sessions iscsid sends TEXT as non immediate,
|
|
* but we always only send one PDU at a time.
|
|
*/
|
|
if (conn->c_stage == ISCSI_CONN_STARTED &&
|
|
!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
|
|
session->queued_cmdsn++;
|
|
session->cmdsn++;
|
|
}
|
|
}
|
|
|
|
if (session->tt->init_task && session->tt->init_task(task))
|
|
return -EIO;
|
|
|
|
if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
|
|
session->state = ISCSI_STATE_LOGGING_OUT;
|
|
|
|
task->state = ISCSI_TASK_RUNNING;
|
|
ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
|
|
"datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
|
|
hdr->itt, task->data_count);
|
|
return 0;
|
|
}
|
|
|
|
static struct iscsi_task *
|
|
__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
|
|
char *data, uint32_t data_size)
|
|
{
|
|
struct iscsi_session *session = conn->session;
|
|
struct iscsi_host *ihost = shost_priv(session->host);
|
|
uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
|
|
struct iscsi_task *task;
|
|
itt_t itt;
|
|
|
|
if (session->state == ISCSI_STATE_TERMINATE)
|
|
return NULL;
|
|
|
|
if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
|
|
/*
|
|
* Login and Text are sent serially, in
|
|
* request-followed-by-response sequence.
|
|
* Same task can be used. Same ITT must be used.
|
|
* Note that login_task is preallocated at conn_create().
|
|
*/
|
|
if (conn->login_task->state != ISCSI_TASK_FREE) {
|
|
iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
|
|
"progress. Cannot start new task.\n");
|
|
return NULL;
|
|
}
|
|
|
|
if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) {
|
|
iscsi_conn_printk(KERN_ERR, conn, "Invalid buffer len of %u for login task. Max len is %u\n", data_size, ISCSI_DEF_MAX_RECV_SEG_LEN);
|
|
return NULL;
|
|
}
|
|
|
|
task = conn->login_task;
|
|
} else {
|
|
if (session->state != ISCSI_STATE_LOGGED_IN)
|
|
return NULL;
|
|
|
|
if (data_size != 0) {
|
|
iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode);
|
|
return NULL;
|
|
}
|
|
|
|
BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
|
|
BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
|
|
|
|
if (!kfifo_out(&session->cmdpool.queue,
|
|
(void*)&task, sizeof(void*)))
|
|
return NULL;
|
|
}
|
|
/*
|
|
* released in complete pdu for task we expect a response for, and
|
|
* released by the lld when it has transmitted the task for
|
|
* pdus we do not expect a response for.
|
|
*/
|
|
refcount_set(&task->refcount, 1);
|
|
task->conn = conn;
|
|
task->sc = NULL;
|
|
INIT_LIST_HEAD(&task->running);
|
|
task->state = ISCSI_TASK_PENDING;
|
|
|
|
if (data_size) {
|
|
memcpy(task->data, data, data_size);
|
|
task->data_count = data_size;
|
|
} else
|
|
task->data_count = 0;
|
|
|
|
if (conn->session->tt->alloc_pdu) {
|
|
if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
|
|
iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
|
|
"pdu for mgmt task.\n");
|
|
goto free_task;
|
|
}
|
|
}
|
|
|
|
itt = task->hdr->itt;
|
|
task->hdr_len = sizeof(struct iscsi_hdr);
|
|
memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
|
|
|
|
if (hdr->itt != RESERVED_ITT) {
|
|
if (session->tt->parse_pdu_itt)
|
|
task->hdr->itt = itt;
|
|
else
|
|
task->hdr->itt = build_itt(task->itt,
|
|
task->conn->session->age);
|
|
}
|
|
|
|
if (!ihost->workq) {
|
|
if (iscsi_prep_mgmt_task(conn, task))
|
|
goto free_task;
|
|
|
|
if (session->tt->xmit_task(task))
|
|
goto free_task;
|
|
} else {
|
|
spin_lock_bh(&conn->taskqueuelock);
|
|
list_add_tail(&task->running, &conn->mgmtqueue);
|
|
spin_unlock_bh(&conn->taskqueuelock);
|
|
iscsi_conn_queue_work(conn);
|
|
}
|
|
|
|
return task;
|
|
|
|
free_task:
|
|
/* regular RX path uses back_lock */
|
|
spin_lock(&session->back_lock);
|
|
__iscsi_put_task(task);
|
|
spin_unlock(&session->back_lock);
|
|
return NULL;
|
|
}
|
|
|
|
int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
|
|
char *data, uint32_t data_size)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_session *session = conn->session;
|
|
int err = 0;
|
|
|
|
spin_lock_bh(&session->frwd_lock);
|
|
if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
|
|
err = -EPERM;
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
|
|
|
|
/**
|
|
* iscsi_cmd_rsp - SCSI Command Response processing
|
|
* @conn: iscsi connection
|
|
* @hdr: iscsi header
|
|
* @task: scsi command task
|
|
* @data: cmd data buffer
|
|
* @datalen: len of buffer
|
|
*
|
|
* iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
|
|
* then completes the command and task.
|
|
**/
|
|
static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
|
|
struct iscsi_task *task, char *data,
|
|
int datalen)
|
|
{
|
|
struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
|
|
struct iscsi_session *session = conn->session;
|
|
struct scsi_cmnd *sc = task->sc;
|
|
|
|
iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
|
|
conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
|
|
|
|
sc->result = (DID_OK << 16) | rhdr->cmd_status;
|
|
|
|
if (task->protected) {
|
|
sector_t sector;
|
|
u8 ascq;
|
|
|
|
/**
|
|
* Transports that didn't implement check_protection
|
|
* callback but still published T10-PI support to scsi-mid
|
|
* deserve this BUG_ON.
|
|
**/
|
|
BUG_ON(!session->tt->check_protection);
|
|
|
|
ascq = session->tt->check_protection(task, §or);
|
|
if (ascq) {
|
|
sc->result = DRIVER_SENSE << 24 |
|
|
SAM_STAT_CHECK_CONDITION;
|
|
scsi_build_sense_buffer(1, sc->sense_buffer,
|
|
ILLEGAL_REQUEST, 0x10, ascq);
|
|
scsi_set_sense_information(sc->sense_buffer,
|
|
SCSI_SENSE_BUFFERSIZE,
|
|
sector);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
|
|
sc->result = DID_ERROR << 16;
|
|
goto out;
|
|
}
|
|
|
|
if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
|
|
uint16_t senselen;
|
|
|
|
if (datalen < 2) {
|
|
invalid_datalen:
|
|
iscsi_conn_printk(KERN_ERR, conn,
|
|
"Got CHECK_CONDITION but invalid data "
|
|
"buffer size of %d\n", datalen);
|
|
sc->result = DID_BAD_TARGET << 16;
|
|
goto out;
|
|
}
|
|
|
|
senselen = get_unaligned_be16(data);
|
|
if (datalen < senselen)
|
|
goto invalid_datalen;
|
|
|
|
memcpy(sc->sense_buffer, data + 2,
|
|
min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
|
|
ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
|
|
min_t(uint16_t, senselen,
|
|
SCSI_SENSE_BUFFERSIZE));
|
|
}
|
|
|
|
if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
|
|
ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
|
|
int res_count = be32_to_cpu(rhdr->bi_residual_count);
|
|
|
|
if (scsi_bidi_cmnd(sc) && res_count > 0 &&
|
|
(rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
|
|
res_count <= scsi_in(sc)->length))
|
|
scsi_in(sc)->resid = res_count;
|
|
else
|
|
sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
|
|
}
|
|
|
|
if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
|
|
ISCSI_FLAG_CMD_OVERFLOW)) {
|
|
int res_count = be32_to_cpu(rhdr->residual_count);
|
|
|
|
if (res_count > 0 &&
|
|
(rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
|
|
res_count <= scsi_bufflen(sc)))
|
|
/* write side for bidi or uni-io set_resid */
|
|
scsi_set_resid(sc, res_count);
|
|
else
|
|
sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
|
|
}
|
|
out:
|
|
ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
|
|
sc, sc->result, task->itt);
|
|
conn->scsirsp_pdus_cnt++;
|
|
iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
|
|
}
|
|
|
|
/**
|
|
* iscsi_data_in_rsp - SCSI Data-In Response processing
|
|
* @conn: iscsi connection
|
|
* @hdr: iscsi pdu
|
|
* @task: scsi command task
|
|
**/
|
|
static void
|
|
iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
|
|
struct iscsi_task *task)
|
|
{
|
|
struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
|
|
struct scsi_cmnd *sc = task->sc;
|
|
|
|
if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
|
|
return;
|
|
|
|
iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
|
|
sc->result = (DID_OK << 16) | rhdr->cmd_status;
|
|
conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
|
|
if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
|
|
ISCSI_FLAG_DATA_OVERFLOW)) {
|
|
int res_count = be32_to_cpu(rhdr->residual_count);
|
|
|
|
if (res_count > 0 &&
|
|
(rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
|
|
res_count <= scsi_in(sc)->length))
|
|
scsi_in(sc)->resid = res_count;
|
|
else
|
|
sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
|
|
}
|
|
|
|
ISCSI_DBG_SESSION(conn->session, "data in with status done "
|
|
"[sc %p res %d itt 0x%x]\n",
|
|
sc, sc->result, task->itt);
|
|
conn->scsirsp_pdus_cnt++;
|
|
iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
|
|
}
|
|
|
|
static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
|
|
{
|
|
struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
|
|
|
|
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
|
|
conn->tmfrsp_pdus_cnt++;
|
|
|
|
if (conn->tmf_state != TMF_QUEUED)
|
|
return;
|
|
|
|
if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
|
|
conn->tmf_state = TMF_SUCCESS;
|
|
else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
|
|
conn->tmf_state = TMF_NOT_FOUND;
|
|
else
|
|
conn->tmf_state = TMF_FAILED;
|
|
wake_up(&conn->ehwait);
|
|
}
|
|
|
|
static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
|
|
{
|
|
struct iscsi_nopout hdr;
|
|
struct iscsi_task *task;
|
|
|
|
if (!rhdr && conn->ping_task)
|
|
return -EINVAL;
|
|
|
|
memset(&hdr, 0, sizeof(struct iscsi_nopout));
|
|
hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
|
|
hdr.flags = ISCSI_FLAG_CMD_FINAL;
|
|
|
|
if (rhdr) {
|
|
hdr.lun = rhdr->lun;
|
|
hdr.ttt = rhdr->ttt;
|
|
hdr.itt = RESERVED_ITT;
|
|
} else
|
|
hdr.ttt = RESERVED_ITT;
|
|
|
|
task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
|
|
if (!task) {
|
|
iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
|
|
return -EIO;
|
|
} else if (!rhdr) {
|
|
/* only track our nops */
|
|
conn->ping_task = task;
|
|
conn->last_ping = jiffies;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iscsi_nop_out_rsp(struct iscsi_task *task,
|
|
struct iscsi_nopin *nop, char *data, int datalen)
|
|
{
|
|
struct iscsi_conn *conn = task->conn;
|
|
int rc = 0;
|
|
|
|
if (conn->ping_task != task) {
|
|
/*
|
|
* If this is not in response to one of our
|
|
* nops then it must be from userspace.
|
|
*/
|
|
if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
|
|
data, datalen))
|
|
rc = ISCSI_ERR_CONN_FAILED;
|
|
} else
|
|
mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
|
|
iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
|
|
return rc;
|
|
}
|
|
|
|
static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
|
|
char *data, int datalen)
|
|
{
|
|
struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
|
|
struct iscsi_hdr rejected_pdu;
|
|
int opcode, rc = 0;
|
|
|
|
conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
|
|
|
|
if (ntoh24(reject->dlength) > datalen ||
|
|
ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
|
|
iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
|
|
"pdu. Invalid data length (pdu dlength "
|
|
"%u, datalen %d\n", ntoh24(reject->dlength),
|
|
datalen);
|
|
return ISCSI_ERR_PROTO;
|
|
}
|
|
memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
|
|
opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
|
|
|
|
switch (reject->reason) {
|
|
case ISCSI_REASON_DATA_DIGEST_ERROR:
|
|
iscsi_conn_printk(KERN_ERR, conn,
|
|
"pdu (op 0x%x itt 0x%x) rejected "
|
|
"due to DataDigest error.\n",
|
|
opcode, rejected_pdu.itt);
|
|
break;
|
|
case ISCSI_REASON_IMM_CMD_REJECT:
|
|
iscsi_conn_printk(KERN_ERR, conn,
|
|
"pdu (op 0x%x itt 0x%x) rejected. Too many "
|
|
"immediate commands.\n",
|
|
opcode, rejected_pdu.itt);
|
|
/*
|
|
* We only send one TMF at a time so if the target could not
|
|
* handle it, then it should get fixed (RFC mandates that
|
|
* a target can handle one immediate TMF per conn).
|
|
*
|
|
* For nops-outs, we could have sent more than one if
|
|
* the target is sending us lots of nop-ins
|
|
*/
|
|
if (opcode != ISCSI_OP_NOOP_OUT)
|
|
return 0;
|
|
|
|
if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
|
|
/*
|
|
* nop-out in response to target's nop-out rejected.
|
|
* Just resend.
|
|
*/
|
|
/* In RX path we are under back lock */
|
|
spin_unlock(&conn->session->back_lock);
|
|
spin_lock(&conn->session->frwd_lock);
|
|
iscsi_send_nopout(conn,
|
|
(struct iscsi_nopin*)&rejected_pdu);
|
|
spin_unlock(&conn->session->frwd_lock);
|
|
spin_lock(&conn->session->back_lock);
|
|
} else {
|
|
struct iscsi_task *task;
|
|
/*
|
|
* Our nop as ping got dropped. We know the target
|
|
* and transport are ok so just clean up
|
|
*/
|
|
task = iscsi_itt_to_task(conn, rejected_pdu.itt);
|
|
if (!task) {
|
|
iscsi_conn_printk(KERN_ERR, conn,
|
|
"Invalid pdu reject. Could "
|
|
"not lookup rejected task.\n");
|
|
rc = ISCSI_ERR_BAD_ITT;
|
|
} else
|
|
rc = iscsi_nop_out_rsp(task,
|
|
(struct iscsi_nopin*)&rejected_pdu,
|
|
NULL, 0);
|
|
}
|
|
break;
|
|
default:
|
|
iscsi_conn_printk(KERN_ERR, conn,
|
|
"pdu (op 0x%x itt 0x%x) rejected. Reason "
|
|
"code 0x%x\n", rejected_pdu.opcode,
|
|
rejected_pdu.itt, reject->reason);
|
|
break;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* iscsi_itt_to_task - look up task by itt
|
|
* @conn: iscsi connection
|
|
* @itt: itt
|
|
*
|
|
* This should be used for mgmt tasks like login and nops, or if
|
|
* the LDD's itt space does not include the session age.
|
|
*
|
|
* The session back_lock must be held.
|
|
*/
|
|
struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
|
|
{
|
|
struct iscsi_session *session = conn->session;
|
|
int i;
|
|
|
|
if (itt == RESERVED_ITT)
|
|
return NULL;
|
|
|
|
if (session->tt->parse_pdu_itt)
|
|
session->tt->parse_pdu_itt(conn, itt, &i, NULL);
|
|
else
|
|
i = get_itt(itt);
|
|
if (i >= session->cmds_max)
|
|
return NULL;
|
|
|
|
return session->cmds[i];
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
|
|
|
|
/**
|
|
* __iscsi_complete_pdu - complete pdu
|
|
* @conn: iscsi conn
|
|
* @hdr: iscsi header
|
|
* @data: data buffer
|
|
* @datalen: len of data buffer
|
|
*
|
|
* Completes pdu processing by freeing any resources allocated at
|
|
* queuecommand or send generic. session back_lock must be held and verify
|
|
* itt must have been called.
|
|
*/
|
|
int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
|
|
char *data, int datalen)
|
|
{
|
|
struct iscsi_session *session = conn->session;
|
|
int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
|
|
struct iscsi_task *task;
|
|
uint32_t itt;
|
|
|
|
conn->last_recv = jiffies;
|
|
rc = iscsi_verify_itt(conn, hdr->itt);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (hdr->itt != RESERVED_ITT)
|
|
itt = get_itt(hdr->itt);
|
|
else
|
|
itt = ~0U;
|
|
|
|
ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
|
|
opcode, conn->id, itt, datalen);
|
|
|
|
if (itt == ~0U) {
|
|
iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
|
|
|
|
switch(opcode) {
|
|
case ISCSI_OP_NOOP_IN:
|
|
if (datalen) {
|
|
rc = ISCSI_ERR_PROTO;
|
|
break;
|
|
}
|
|
|
|
if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
|
|
break;
|
|
|
|
/* In RX path we are under back lock */
|
|
spin_unlock(&session->back_lock);
|
|
spin_lock(&session->frwd_lock);
|
|
iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
|
|
spin_unlock(&session->frwd_lock);
|
|
spin_lock(&session->back_lock);
|
|
break;
|
|
case ISCSI_OP_REJECT:
|
|
rc = iscsi_handle_reject(conn, hdr, data, datalen);
|
|
break;
|
|
case ISCSI_OP_ASYNC_EVENT:
|
|
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
|
|
if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
|
|
rc = ISCSI_ERR_CONN_FAILED;
|
|
break;
|
|
default:
|
|
rc = ISCSI_ERR_BAD_OPCODE;
|
|
break;
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
switch(opcode) {
|
|
case ISCSI_OP_SCSI_CMD_RSP:
|
|
case ISCSI_OP_SCSI_DATA_IN:
|
|
task = iscsi_itt_to_ctask(conn, hdr->itt);
|
|
if (!task)
|
|
return ISCSI_ERR_BAD_ITT;
|
|
task->last_xfer = jiffies;
|
|
break;
|
|
case ISCSI_OP_R2T:
|
|
/*
|
|
* LLD handles R2Ts if they need to.
|
|
*/
|
|
return 0;
|
|
case ISCSI_OP_LOGOUT_RSP:
|
|
case ISCSI_OP_LOGIN_RSP:
|
|
case ISCSI_OP_TEXT_RSP:
|
|
case ISCSI_OP_SCSI_TMFUNC_RSP:
|
|
case ISCSI_OP_NOOP_IN:
|
|
task = iscsi_itt_to_task(conn, hdr->itt);
|
|
if (!task)
|
|
return ISCSI_ERR_BAD_ITT;
|
|
break;
|
|
default:
|
|
return ISCSI_ERR_BAD_OPCODE;
|
|
}
|
|
|
|
switch(opcode) {
|
|
case ISCSI_OP_SCSI_CMD_RSP:
|
|
iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
|
|
break;
|
|
case ISCSI_OP_SCSI_DATA_IN:
|
|
iscsi_data_in_rsp(conn, hdr, task);
|
|
break;
|
|
case ISCSI_OP_LOGOUT_RSP:
|
|
iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
|
|
if (datalen) {
|
|
rc = ISCSI_ERR_PROTO;
|
|
break;
|
|
}
|
|
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
|
|
goto recv_pdu;
|
|
case ISCSI_OP_LOGIN_RSP:
|
|
case ISCSI_OP_TEXT_RSP:
|
|
iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
|
|
/*
|
|
* login related PDU's exp_statsn is handled in
|
|
* userspace
|
|
*/
|
|
goto recv_pdu;
|
|
case ISCSI_OP_SCSI_TMFUNC_RSP:
|
|
iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
|
|
if (datalen) {
|
|
rc = ISCSI_ERR_PROTO;
|
|
break;
|
|
}
|
|
|
|
iscsi_tmf_rsp(conn, hdr);
|
|
iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
|
|
break;
|
|
case ISCSI_OP_NOOP_IN:
|
|
iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
|
|
if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
|
|
rc = ISCSI_ERR_PROTO;
|
|
break;
|
|
}
|
|
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
|
|
|
|
rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
|
|
data, datalen);
|
|
break;
|
|
default:
|
|
rc = ISCSI_ERR_BAD_OPCODE;
|
|
break;
|
|
}
|
|
|
|
out:
|
|
return rc;
|
|
recv_pdu:
|
|
if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
|
|
rc = ISCSI_ERR_CONN_FAILED;
|
|
iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
|
|
|
|
int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
|
|
char *data, int datalen)
|
|
{
|
|
int rc;
|
|
|
|
spin_lock(&conn->session->back_lock);
|
|
rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
|
|
spin_unlock(&conn->session->back_lock);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
|
|
|
|
int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
|
|
{
|
|
struct iscsi_session *session = conn->session;
|
|
int age = 0, i = 0;
|
|
|
|
if (itt == RESERVED_ITT)
|
|
return 0;
|
|
|
|
if (session->tt->parse_pdu_itt)
|
|
session->tt->parse_pdu_itt(conn, itt, &i, &age);
|
|
else {
|
|
i = get_itt(itt);
|
|
age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
|
|
}
|
|
|
|
if (age != session->age) {
|
|
iscsi_conn_printk(KERN_ERR, conn,
|
|
"received itt %x expected session age (%x)\n",
|
|
(__force u32)itt, session->age);
|
|
return ISCSI_ERR_BAD_ITT;
|
|
}
|
|
|
|
if (i >= session->cmds_max) {
|
|
iscsi_conn_printk(KERN_ERR, conn,
|
|
"received invalid itt index %u (max cmds "
|
|
"%u.\n", i, session->cmds_max);
|
|
return ISCSI_ERR_BAD_ITT;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_verify_itt);
|
|
|
|
/**
|
|
* iscsi_itt_to_ctask - look up ctask by itt
|
|
* @conn: iscsi connection
|
|
* @itt: itt
|
|
*
|
|
* This should be used for cmd tasks.
|
|
*
|
|
* The session back_lock must be held.
|
|
*/
|
|
struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
|
|
{
|
|
struct iscsi_task *task;
|
|
|
|
if (iscsi_verify_itt(conn, itt))
|
|
return NULL;
|
|
|
|
task = iscsi_itt_to_task(conn, itt);
|
|
if (!task || !task->sc)
|
|
return NULL;
|
|
|
|
if (task->sc->SCp.phase != conn->session->age) {
|
|
iscsi_session_printk(KERN_ERR, conn->session,
|
|
"task's session age %d, expected %d\n",
|
|
task->sc->SCp.phase, conn->session->age);
|
|
return NULL;
|
|
}
|
|
|
|
return task;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
|
|
|
|
void iscsi_session_failure(struct iscsi_session *session,
|
|
enum iscsi_err err)
|
|
{
|
|
struct iscsi_conn *conn;
|
|
struct device *dev;
|
|
|
|
spin_lock_bh(&session->frwd_lock);
|
|
conn = session->leadconn;
|
|
if (session->state == ISCSI_STATE_TERMINATE || !conn) {
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
return;
|
|
}
|
|
|
|
dev = get_device(&conn->cls_conn->dev);
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
if (!dev)
|
|
return;
|
|
/*
|
|
* if the host is being removed bypass the connection
|
|
* recovery initialization because we are going to kill
|
|
* the session.
|
|
*/
|
|
if (err == ISCSI_ERR_INVALID_HOST)
|
|
iscsi_conn_error_event(conn->cls_conn, err);
|
|
else
|
|
iscsi_conn_failure(conn, err);
|
|
put_device(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_session_failure);
|
|
|
|
void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
|
|
{
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
spin_lock_bh(&session->frwd_lock);
|
|
if (session->state == ISCSI_STATE_FAILED) {
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
return;
|
|
}
|
|
|
|
if (conn->stop_stage == 0)
|
|
session->state = ISCSI_STATE_FAILED;
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
|
|
set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
|
|
set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
|
|
iscsi_conn_error_event(conn->cls_conn, err);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_failure);
|
|
|
|
static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
/*
|
|
* Check for iSCSI window and take care of CmdSN wrap-around
|
|
*/
|
|
if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
|
|
ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
|
|
"%u MaxCmdSN %u CmdSN %u/%u\n",
|
|
session->exp_cmdsn, session->max_cmdsn,
|
|
session->cmdsn, session->queued_cmdsn);
|
|
return -ENOSPC;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int iscsi_xmit_task(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_task *task = conn->task;
|
|
int rc;
|
|
|
|
if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
|
|
return -ENODATA;
|
|
|
|
__iscsi_get_task(task);
|
|
spin_unlock_bh(&conn->session->frwd_lock);
|
|
rc = conn->session->tt->xmit_task(task);
|
|
spin_lock_bh(&conn->session->frwd_lock);
|
|
if (!rc) {
|
|
/* done with this task */
|
|
task->last_xfer = jiffies;
|
|
conn->task = NULL;
|
|
}
|
|
/* regular RX path uses back_lock */
|
|
spin_lock(&conn->session->back_lock);
|
|
__iscsi_put_task(task);
|
|
spin_unlock(&conn->session->back_lock);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* iscsi_requeue_task - requeue task to run from session workqueue
|
|
* @task: task to requeue
|
|
*
|
|
* LLDs that need to run a task from the session workqueue should call
|
|
* this. The session frwd_lock must be held. This should only be called
|
|
* by software drivers.
|
|
*/
|
|
void iscsi_requeue_task(struct iscsi_task *task)
|
|
{
|
|
struct iscsi_conn *conn = task->conn;
|
|
|
|
/*
|
|
* this may be on the requeue list already if the xmit_task callout
|
|
* is handling the r2ts while we are adding new ones
|
|
*/
|
|
spin_lock_bh(&conn->taskqueuelock);
|
|
if (list_empty(&task->running))
|
|
list_add_tail(&task->running, &conn->requeue);
|
|
spin_unlock_bh(&conn->taskqueuelock);
|
|
iscsi_conn_queue_work(conn);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_requeue_task);
|
|
|
|
/**
|
|
* iscsi_data_xmit - xmit any command into the scheduled connection
|
|
* @conn: iscsi connection
|
|
*
|
|
* Notes:
|
|
* The function can return -EAGAIN in which case the caller must
|
|
* re-schedule it again later or recover. '0' return code means
|
|
* successful xmit.
|
|
**/
|
|
static int iscsi_data_xmit(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_task *task;
|
|
int rc = 0;
|
|
|
|
spin_lock_bh(&conn->session->frwd_lock);
|
|
if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
|
|
ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
|
|
spin_unlock_bh(&conn->session->frwd_lock);
|
|
return -ENODATA;
|
|
}
|
|
|
|
if (conn->task) {
|
|
rc = iscsi_xmit_task(conn);
|
|
if (rc)
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* process mgmt pdus like nops before commands since we should
|
|
* only have one nop-out as a ping from us and targets should not
|
|
* overflow us with nop-ins
|
|
*/
|
|
spin_lock_bh(&conn->taskqueuelock);
|
|
check_mgmt:
|
|
while (!list_empty(&conn->mgmtqueue)) {
|
|
conn->task = list_entry(conn->mgmtqueue.next,
|
|
struct iscsi_task, running);
|
|
list_del_init(&conn->task->running);
|
|
spin_unlock_bh(&conn->taskqueuelock);
|
|
if (iscsi_prep_mgmt_task(conn, conn->task)) {
|
|
/* regular RX path uses back_lock */
|
|
spin_lock_bh(&conn->session->back_lock);
|
|
__iscsi_put_task(conn->task);
|
|
spin_unlock_bh(&conn->session->back_lock);
|
|
conn->task = NULL;
|
|
spin_lock_bh(&conn->taskqueuelock);
|
|
continue;
|
|
}
|
|
rc = iscsi_xmit_task(conn);
|
|
if (rc)
|
|
goto done;
|
|
spin_lock_bh(&conn->taskqueuelock);
|
|
}
|
|
|
|
/* process pending command queue */
|
|
while (!list_empty(&conn->cmdqueue)) {
|
|
conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
|
|
running);
|
|
list_del_init(&conn->task->running);
|
|
spin_unlock_bh(&conn->taskqueuelock);
|
|
if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
|
|
fail_scsi_task(conn->task, DID_IMM_RETRY);
|
|
spin_lock_bh(&conn->taskqueuelock);
|
|
continue;
|
|
}
|
|
rc = iscsi_prep_scsi_cmd_pdu(conn->task);
|
|
if (rc) {
|
|
if (rc == -ENOMEM || rc == -EACCES) {
|
|
spin_lock_bh(&conn->taskqueuelock);
|
|
list_add_tail(&conn->task->running,
|
|
&conn->cmdqueue);
|
|
conn->task = NULL;
|
|
spin_unlock_bh(&conn->taskqueuelock);
|
|
goto done;
|
|
} else
|
|
fail_scsi_task(conn->task, DID_ABORT);
|
|
spin_lock_bh(&conn->taskqueuelock);
|
|
continue;
|
|
}
|
|
rc = iscsi_xmit_task(conn);
|
|
if (rc)
|
|
goto done;
|
|
/*
|
|
* we could continuously get new task requests so
|
|
* we need to check the mgmt queue for nops that need to
|
|
* be sent to aviod starvation
|
|
*/
|
|
spin_lock_bh(&conn->taskqueuelock);
|
|
if (!list_empty(&conn->mgmtqueue))
|
|
goto check_mgmt;
|
|
}
|
|
|
|
while (!list_empty(&conn->requeue)) {
|
|
/*
|
|
* we always do fastlogout - conn stop code will clean up.
|
|
*/
|
|
if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
|
|
break;
|
|
|
|
task = list_entry(conn->requeue.next, struct iscsi_task,
|
|
running);
|
|
if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
|
|
break;
|
|
|
|
conn->task = task;
|
|
list_del_init(&conn->task->running);
|
|
conn->task->state = ISCSI_TASK_RUNNING;
|
|
spin_unlock_bh(&conn->taskqueuelock);
|
|
rc = iscsi_xmit_task(conn);
|
|
if (rc)
|
|
goto done;
|
|
spin_lock_bh(&conn->taskqueuelock);
|
|
if (!list_empty(&conn->mgmtqueue))
|
|
goto check_mgmt;
|
|
}
|
|
spin_unlock_bh(&conn->taskqueuelock);
|
|
spin_unlock_bh(&conn->session->frwd_lock);
|
|
return -ENODATA;
|
|
|
|
done:
|
|
spin_unlock_bh(&conn->session->frwd_lock);
|
|
return rc;
|
|
}
|
|
|
|
static void iscsi_xmitworker(struct work_struct *work)
|
|
{
|
|
struct iscsi_conn *conn =
|
|
container_of(work, struct iscsi_conn, xmitwork);
|
|
int rc;
|
|
/*
|
|
* serialize Xmit worker on a per-connection basis.
|
|
*/
|
|
do {
|
|
rc = iscsi_data_xmit(conn);
|
|
} while (rc >= 0 || rc == -EAGAIN);
|
|
}
|
|
|
|
static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
|
|
struct scsi_cmnd *sc)
|
|
{
|
|
struct iscsi_task *task;
|
|
|
|
if (!kfifo_out(&conn->session->cmdpool.queue,
|
|
(void *) &task, sizeof(void *)))
|
|
return NULL;
|
|
|
|
sc->SCp.phase = conn->session->age;
|
|
sc->SCp.ptr = (char *) task;
|
|
|
|
refcount_set(&task->refcount, 1);
|
|
task->state = ISCSI_TASK_PENDING;
|
|
task->conn = conn;
|
|
task->sc = sc;
|
|
task->have_checked_conn = false;
|
|
task->last_timeout = jiffies;
|
|
task->last_xfer = jiffies;
|
|
task->protected = false;
|
|
INIT_LIST_HEAD(&task->running);
|
|
return task;
|
|
}
|
|
|
|
enum {
|
|
FAILURE_BAD_HOST = 1,
|
|
FAILURE_SESSION_FAILED,
|
|
FAILURE_SESSION_FREED,
|
|
FAILURE_WINDOW_CLOSED,
|
|
FAILURE_OOM,
|
|
FAILURE_SESSION_TERMINATE,
|
|
FAILURE_SESSION_IN_RECOVERY,
|
|
FAILURE_SESSION_RECOVERY_TIMEOUT,
|
|
FAILURE_SESSION_LOGGING_OUT,
|
|
FAILURE_SESSION_NOT_READY,
|
|
};
|
|
|
|
int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
|
|
{
|
|
struct iscsi_cls_session *cls_session;
|
|
struct iscsi_host *ihost;
|
|
int reason = 0;
|
|
struct iscsi_session *session;
|
|
struct iscsi_conn *conn;
|
|
struct iscsi_task *task = NULL;
|
|
|
|
sc->result = 0;
|
|
sc->SCp.ptr = NULL;
|
|
|
|
ihost = shost_priv(host);
|
|
|
|
cls_session = starget_to_session(scsi_target(sc->device));
|
|
session = cls_session->dd_data;
|
|
spin_lock_bh(&session->frwd_lock);
|
|
|
|
reason = iscsi_session_chkready(cls_session);
|
|
if (reason) {
|
|
sc->result = reason;
|
|
goto fault;
|
|
}
|
|
|
|
if (session->state != ISCSI_STATE_LOGGED_IN) {
|
|
/*
|
|
* to handle the race between when we set the recovery state
|
|
* and block the session we requeue here (commands could
|
|
* be entering our queuecommand while a block is starting
|
|
* up because the block code is not locked)
|
|
*/
|
|
switch (session->state) {
|
|
case ISCSI_STATE_FAILED:
|
|
case ISCSI_STATE_IN_RECOVERY:
|
|
reason = FAILURE_SESSION_IN_RECOVERY;
|
|
sc->result = DID_IMM_RETRY << 16;
|
|
break;
|
|
case ISCSI_STATE_LOGGING_OUT:
|
|
reason = FAILURE_SESSION_LOGGING_OUT;
|
|
sc->result = DID_IMM_RETRY << 16;
|
|
break;
|
|
case ISCSI_STATE_RECOVERY_FAILED:
|
|
reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
|
|
sc->result = DID_TRANSPORT_FAILFAST << 16;
|
|
break;
|
|
case ISCSI_STATE_TERMINATE:
|
|
reason = FAILURE_SESSION_TERMINATE;
|
|
sc->result = DID_NO_CONNECT << 16;
|
|
break;
|
|
default:
|
|
reason = FAILURE_SESSION_FREED;
|
|
sc->result = DID_NO_CONNECT << 16;
|
|
}
|
|
goto fault;
|
|
}
|
|
|
|
conn = session->leadconn;
|
|
if (!conn) {
|
|
reason = FAILURE_SESSION_FREED;
|
|
sc->result = DID_NO_CONNECT << 16;
|
|
goto fault;
|
|
}
|
|
|
|
if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
|
|
reason = FAILURE_SESSION_IN_RECOVERY;
|
|
sc->result = DID_REQUEUE;
|
|
goto fault;
|
|
}
|
|
|
|
if (iscsi_check_cmdsn_window_closed(conn)) {
|
|
reason = FAILURE_WINDOW_CLOSED;
|
|
goto reject;
|
|
}
|
|
|
|
task = iscsi_alloc_task(conn, sc);
|
|
if (!task) {
|
|
reason = FAILURE_OOM;
|
|
goto reject;
|
|
}
|
|
|
|
if (!ihost->workq) {
|
|
reason = iscsi_prep_scsi_cmd_pdu(task);
|
|
if (reason) {
|
|
if (reason == -ENOMEM || reason == -EACCES) {
|
|
reason = FAILURE_OOM;
|
|
goto prepd_reject;
|
|
} else {
|
|
sc->result = DID_ABORT << 16;
|
|
goto prepd_fault;
|
|
}
|
|
}
|
|
if (session->tt->xmit_task(task)) {
|
|
session->cmdsn--;
|
|
reason = FAILURE_SESSION_NOT_READY;
|
|
goto prepd_reject;
|
|
}
|
|
} else {
|
|
spin_lock_bh(&conn->taskqueuelock);
|
|
list_add_tail(&task->running, &conn->cmdqueue);
|
|
spin_unlock_bh(&conn->taskqueuelock);
|
|
iscsi_conn_queue_work(conn);
|
|
}
|
|
|
|
session->queued_cmdsn++;
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
return 0;
|
|
|
|
prepd_reject:
|
|
iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
|
|
reject:
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
|
|
sc->cmnd[0], reason);
|
|
return SCSI_MLQUEUE_TARGET_BUSY;
|
|
|
|
prepd_fault:
|
|
iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
|
|
fault:
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
|
|
sc->cmnd[0], reason);
|
|
if (!scsi_bidi_cmnd(sc))
|
|
scsi_set_resid(sc, scsi_bufflen(sc));
|
|
else {
|
|
scsi_out(sc)->resid = scsi_out(sc)->length;
|
|
scsi_in(sc)->resid = scsi_in(sc)->length;
|
|
}
|
|
sc->scsi_done(sc);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_queuecommand);
|
|
|
|
int iscsi_target_alloc(struct scsi_target *starget)
|
|
{
|
|
struct iscsi_cls_session *cls_session = starget_to_session(starget);
|
|
struct iscsi_session *session = cls_session->dd_data;
|
|
|
|
starget->can_queue = session->scsi_cmds_max;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_target_alloc);
|
|
|
|
static void iscsi_tmf_timedout(unsigned long data)
|
|
{
|
|
struct iscsi_conn *conn = (struct iscsi_conn *)data;
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
spin_lock(&session->frwd_lock);
|
|
if (conn->tmf_state == TMF_QUEUED) {
|
|
conn->tmf_state = TMF_TIMEDOUT;
|
|
ISCSI_DBG_EH(session, "tmf timedout\n");
|
|
/* unblock eh_abort() */
|
|
wake_up(&conn->ehwait);
|
|
}
|
|
spin_unlock(&session->frwd_lock);
|
|
}
|
|
|
|
static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
|
|
struct iscsi_tm *hdr, int age,
|
|
int timeout)
|
|
{
|
|
struct iscsi_session *session = conn->session;
|
|
struct iscsi_task *task;
|
|
|
|
task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
|
|
NULL, 0);
|
|
if (!task) {
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
|
|
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
|
spin_lock_bh(&session->frwd_lock);
|
|
return -EPERM;
|
|
}
|
|
conn->tmfcmd_pdus_cnt++;
|
|
conn->tmf_timer.expires = timeout * HZ + jiffies;
|
|
conn->tmf_timer.function = iscsi_tmf_timedout;
|
|
conn->tmf_timer.data = (unsigned long)conn;
|
|
add_timer(&conn->tmf_timer);
|
|
ISCSI_DBG_EH(session, "tmf set timeout\n");
|
|
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
mutex_unlock(&session->eh_mutex);
|
|
|
|
/*
|
|
* block eh thread until:
|
|
*
|
|
* 1) tmf response
|
|
* 2) tmf timeout
|
|
* 3) session is terminated or restarted or userspace has
|
|
* given up on recovery
|
|
*/
|
|
wait_event_interruptible(conn->ehwait, age != session->age ||
|
|
session->state != ISCSI_STATE_LOGGED_IN ||
|
|
conn->tmf_state != TMF_QUEUED);
|
|
if (signal_pending(current))
|
|
flush_signals(current);
|
|
del_timer_sync(&conn->tmf_timer);
|
|
|
|
mutex_lock(&session->eh_mutex);
|
|
spin_lock_bh(&session->frwd_lock);
|
|
/* if the session drops it will clean up the task */
|
|
if (age != session->age ||
|
|
session->state != ISCSI_STATE_LOGGED_IN)
|
|
return -ENOTCONN;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Fail commands. session lock held and recv side suspended and xmit
|
|
* thread flushed
|
|
*/
|
|
static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error)
|
|
{
|
|
struct iscsi_task *task;
|
|
int i;
|
|
|
|
for (i = 0; i < conn->session->cmds_max; i++) {
|
|
task = conn->session->cmds[i];
|
|
if (!task->sc || task->state == ISCSI_TASK_FREE)
|
|
continue;
|
|
|
|
if (lun != -1 && lun != task->sc->device->lun)
|
|
continue;
|
|
|
|
ISCSI_DBG_SESSION(conn->session,
|
|
"failing sc %p itt 0x%x state %d\n",
|
|
task->sc, task->itt, task->state);
|
|
fail_scsi_task(task, error);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* iscsi_suspend_queue - suspend iscsi_queuecommand
|
|
* @conn: iscsi conn to stop queueing IO on
|
|
*
|
|
* This grabs the session frwd_lock to make sure no one is in
|
|
* xmit_task/queuecommand, and then sets suspend to prevent
|
|
* new commands from being queued. This only needs to be called
|
|
* by offload drivers that need to sync a path like ep disconnect
|
|
* with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
|
|
* will call iscsi_start_tx and iscsi_unblock_session when in FFP.
|
|
*/
|
|
void iscsi_suspend_queue(struct iscsi_conn *conn)
|
|
{
|
|
spin_lock_bh(&conn->session->frwd_lock);
|
|
set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
|
|
spin_unlock_bh(&conn->session->frwd_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
|
|
|
|
/**
|
|
* iscsi_suspend_tx - suspend iscsi_data_xmit
|
|
* @conn: iscsi conn tp stop processing IO on.
|
|
*
|
|
* This function sets the suspend bit to prevent iscsi_data_xmit
|
|
* from sending new IO, and if work is queued on the xmit thread
|
|
* it will wait for it to be completed.
|
|
*/
|
|
void iscsi_suspend_tx(struct iscsi_conn *conn)
|
|
{
|
|
struct Scsi_Host *shost = conn->session->host;
|
|
struct iscsi_host *ihost = shost_priv(shost);
|
|
|
|
set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
|
|
if (ihost->workq)
|
|
flush_workqueue(ihost->workq);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
|
|
|
|
static void iscsi_start_tx(struct iscsi_conn *conn)
|
|
{
|
|
clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
|
|
iscsi_conn_queue_work(conn);
|
|
}
|
|
|
|
/*
|
|
* We want to make sure a ping is in flight. It has timed out.
|
|
* And we are not busy processing a pdu that is making
|
|
* progress but got started before the ping and is taking a while
|
|
* to complete so the ping is just stuck behind it in a queue.
|
|
*/
|
|
static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
|
|
{
|
|
if (conn->ping_task &&
|
|
time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
|
|
(conn->ping_timeout * HZ), jiffies))
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
|
|
{
|
|
enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
|
|
struct iscsi_task *task = NULL, *running_task;
|
|
struct iscsi_cls_session *cls_session;
|
|
struct iscsi_session *session;
|
|
struct iscsi_conn *conn;
|
|
int i;
|
|
|
|
cls_session = starget_to_session(scsi_target(sc->device));
|
|
session = cls_session->dd_data;
|
|
|
|
ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
|
|
|
|
spin_lock(&session->frwd_lock);
|
|
task = (struct iscsi_task *)sc->SCp.ptr;
|
|
if (!task) {
|
|
/*
|
|
* Raced with completion. Blk layer has taken ownership
|
|
* so let timeout code complete it now.
|
|
*/
|
|
rc = BLK_EH_HANDLED;
|
|
goto done;
|
|
}
|
|
|
|
if (session->state != ISCSI_STATE_LOGGED_IN) {
|
|
/*
|
|
* We are probably in the middle of iscsi recovery so let
|
|
* that complete and handle the error.
|
|
*/
|
|
rc = BLK_EH_RESET_TIMER;
|
|
goto done;
|
|
}
|
|
|
|
conn = session->leadconn;
|
|
if (!conn) {
|
|
/* In the middle of shuting down */
|
|
rc = BLK_EH_RESET_TIMER;
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* If we have sent (at least queued to the network layer) a pdu or
|
|
* recvd one for the task since the last timeout ask for
|
|
* more time. If on the next timeout we have not made progress
|
|
* we can check if it is the task or connection when we send the
|
|
* nop as a ping.
|
|
*/
|
|
if (time_after(task->last_xfer, task->last_timeout)) {
|
|
ISCSI_DBG_EH(session, "Command making progress. Asking "
|
|
"scsi-ml for more time to complete. "
|
|
"Last data xfer at %lu. Last timeout was at "
|
|
"%lu\n.", task->last_xfer, task->last_timeout);
|
|
task->have_checked_conn = false;
|
|
rc = BLK_EH_RESET_TIMER;
|
|
goto done;
|
|
}
|
|
|
|
if (!conn->recv_timeout && !conn->ping_timeout)
|
|
goto done;
|
|
/*
|
|
* if the ping timedout then we are in the middle of cleaning up
|
|
* and can let the iscsi eh handle it
|
|
*/
|
|
if (iscsi_has_ping_timed_out(conn)) {
|
|
rc = BLK_EH_RESET_TIMER;
|
|
goto done;
|
|
}
|
|
|
|
for (i = 0; i < conn->session->cmds_max; i++) {
|
|
running_task = conn->session->cmds[i];
|
|
if (!running_task->sc || running_task == task ||
|
|
running_task->state != ISCSI_TASK_RUNNING)
|
|
continue;
|
|
|
|
/*
|
|
* Only check if cmds started before this one have made
|
|
* progress, or this could never fail
|
|
*/
|
|
if (time_after(running_task->sc->jiffies_at_alloc,
|
|
task->sc->jiffies_at_alloc))
|
|
continue;
|
|
|
|
if (time_after(running_task->last_xfer, task->last_timeout)) {
|
|
/*
|
|
* This task has not made progress, but a task
|
|
* started before us has transferred data since
|
|
* we started/last-checked. We could be queueing
|
|
* too many tasks or the LU is bad.
|
|
*
|
|
* If the device is bad the cmds ahead of us on
|
|
* other devs will complete, and this loop will
|
|
* eventually fail starting the scsi eh.
|
|
*/
|
|
ISCSI_DBG_EH(session, "Command has not made progress "
|
|
"but commands ahead of it have. "
|
|
"Asking scsi-ml for more time to "
|
|
"complete. Our last xfer vs running task "
|
|
"last xfer %lu/%lu. Last check %lu.\n",
|
|
task->last_xfer, running_task->last_xfer,
|
|
task->last_timeout);
|
|
rc = BLK_EH_RESET_TIMER;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
/* Assumes nop timeout is shorter than scsi cmd timeout */
|
|
if (task->have_checked_conn)
|
|
goto done;
|
|
|
|
/*
|
|
* Checking the transport already or nop from a cmd timeout still
|
|
* running
|
|
*/
|
|
if (conn->ping_task) {
|
|
task->have_checked_conn = true;
|
|
rc = BLK_EH_RESET_TIMER;
|
|
goto done;
|
|
}
|
|
|
|
/* Make sure there is a transport check done */
|
|
iscsi_send_nopout(conn, NULL);
|
|
task->have_checked_conn = true;
|
|
rc = BLK_EH_RESET_TIMER;
|
|
|
|
done:
|
|
if (task)
|
|
task->last_timeout = jiffies;
|
|
spin_unlock(&session->frwd_lock);
|
|
ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
|
|
"timer reset" : "nh");
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out);
|
|
|
|
static void iscsi_check_transport_timeouts(unsigned long data)
|
|
{
|
|
struct iscsi_conn *conn = (struct iscsi_conn *)data;
|
|
struct iscsi_session *session = conn->session;
|
|
unsigned long recv_timeout, next_timeout = 0, last_recv;
|
|
|
|
spin_lock(&session->frwd_lock);
|
|
if (session->state != ISCSI_STATE_LOGGED_IN)
|
|
goto done;
|
|
|
|
recv_timeout = conn->recv_timeout;
|
|
if (!recv_timeout)
|
|
goto done;
|
|
|
|
recv_timeout *= HZ;
|
|
last_recv = conn->last_recv;
|
|
|
|
if (iscsi_has_ping_timed_out(conn)) {
|
|
iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
|
|
"expired, recv timeout %d, last rx %lu, "
|
|
"last ping %lu, now %lu\n",
|
|
conn->ping_timeout, conn->recv_timeout,
|
|
last_recv, conn->last_ping, jiffies);
|
|
spin_unlock(&session->frwd_lock);
|
|
iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT);
|
|
return;
|
|
}
|
|
|
|
if (time_before_eq(last_recv + recv_timeout, jiffies)) {
|
|
/* send a ping to try to provoke some traffic */
|
|
ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
|
|
if (iscsi_send_nopout(conn, NULL))
|
|
next_timeout = jiffies + (1 * HZ);
|
|
else
|
|
next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
|
|
} else
|
|
next_timeout = last_recv + recv_timeout;
|
|
|
|
ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
|
|
mod_timer(&conn->transport_timer, next_timeout);
|
|
done:
|
|
spin_unlock(&session->frwd_lock);
|
|
}
|
|
|
|
static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
|
|
struct iscsi_tm *hdr)
|
|
{
|
|
memset(hdr, 0, sizeof(*hdr));
|
|
hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
|
|
hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
|
|
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
|
|
hdr->lun = task->lun;
|
|
hdr->rtt = task->hdr_itt;
|
|
hdr->refcmdsn = task->cmdsn;
|
|
}
|
|
|
|
int iscsi_eh_abort(struct scsi_cmnd *sc)
|
|
{
|
|
struct iscsi_cls_session *cls_session;
|
|
struct iscsi_session *session;
|
|
struct iscsi_conn *conn;
|
|
struct iscsi_task *task;
|
|
struct iscsi_tm *hdr;
|
|
int age;
|
|
|
|
cls_session = starget_to_session(scsi_target(sc->device));
|
|
session = cls_session->dd_data;
|
|
|
|
ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
|
|
|
|
mutex_lock(&session->eh_mutex);
|
|
spin_lock_bh(&session->frwd_lock);
|
|
/*
|
|
* if session was ISCSI_STATE_IN_RECOVERY then we may not have
|
|
* got the command.
|
|
*/
|
|
if (!sc->SCp.ptr) {
|
|
ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
|
|
"it completed.\n");
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
mutex_unlock(&session->eh_mutex);
|
|
return SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* If we are not logged in or we have started a new session
|
|
* then let the host reset code handle this
|
|
*/
|
|
if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
|
|
sc->SCp.phase != session->age) {
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
mutex_unlock(&session->eh_mutex);
|
|
ISCSI_DBG_EH(session, "failing abort due to dropped "
|
|
"session.\n");
|
|
return FAILED;
|
|
}
|
|
|
|
conn = session->leadconn;
|
|
conn->eh_abort_cnt++;
|
|
age = session->age;
|
|
|
|
task = (struct iscsi_task *)sc->SCp.ptr;
|
|
ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
|
|
sc, task->itt);
|
|
|
|
/* task completed before time out */
|
|
if (!task->sc) {
|
|
ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
|
|
goto success;
|
|
}
|
|
|
|
if (task->state == ISCSI_TASK_PENDING) {
|
|
fail_scsi_task(task, DID_ABORT);
|
|
goto success;
|
|
}
|
|
|
|
/* only have one tmf outstanding at a time */
|
|
if (conn->tmf_state != TMF_INITIAL)
|
|
goto failed;
|
|
conn->tmf_state = TMF_QUEUED;
|
|
|
|
hdr = &conn->tmhdr;
|
|
iscsi_prep_abort_task_pdu(task, hdr);
|
|
|
|
if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout))
|
|
goto failed;
|
|
|
|
switch (conn->tmf_state) {
|
|
case TMF_SUCCESS:
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
/*
|
|
* stop tx side incase the target had sent a abort rsp but
|
|
* the initiator was still writing out data.
|
|
*/
|
|
iscsi_suspend_tx(conn);
|
|
/*
|
|
* we do not stop the recv side because targets have been
|
|
* good and have never sent us a successful tmf response
|
|
* then sent more data for the cmd.
|
|
*/
|
|
spin_lock_bh(&session->frwd_lock);
|
|
fail_scsi_task(task, DID_ABORT);
|
|
conn->tmf_state = TMF_INITIAL;
|
|
memset(hdr, 0, sizeof(*hdr));
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
iscsi_start_tx(conn);
|
|
goto success_unlocked;
|
|
case TMF_TIMEDOUT:
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
|
|
goto failed_unlocked;
|
|
case TMF_NOT_FOUND:
|
|
if (!sc->SCp.ptr) {
|
|
conn->tmf_state = TMF_INITIAL;
|
|
memset(hdr, 0, sizeof(*hdr));
|
|
/* task completed before tmf abort response */
|
|
ISCSI_DBG_EH(session, "sc completed while abort in "
|
|
"progress\n");
|
|
goto success;
|
|
}
|
|
/* fall through */
|
|
default:
|
|
conn->tmf_state = TMF_INITIAL;
|
|
goto failed;
|
|
}
|
|
|
|
success:
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
success_unlocked:
|
|
ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
|
|
sc, task->itt);
|
|
mutex_unlock(&session->eh_mutex);
|
|
return SUCCESS;
|
|
|
|
failed:
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
failed_unlocked:
|
|
ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
|
|
task ? task->itt : 0);
|
|
mutex_unlock(&session->eh_mutex);
|
|
return FAILED;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_eh_abort);
|
|
|
|
static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
|
|
{
|
|
memset(hdr, 0, sizeof(*hdr));
|
|
hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
|
|
hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
|
|
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
|
|
int_to_scsilun(sc->device->lun, &hdr->lun);
|
|
hdr->rtt = RESERVED_ITT;
|
|
}
|
|
|
|
int iscsi_eh_device_reset(struct scsi_cmnd *sc)
|
|
{
|
|
struct iscsi_cls_session *cls_session;
|
|
struct iscsi_session *session;
|
|
struct iscsi_conn *conn;
|
|
struct iscsi_tm *hdr;
|
|
int rc = FAILED;
|
|
|
|
cls_session = starget_to_session(scsi_target(sc->device));
|
|
session = cls_session->dd_data;
|
|
|
|
ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc,
|
|
sc->device->lun);
|
|
|
|
mutex_lock(&session->eh_mutex);
|
|
spin_lock_bh(&session->frwd_lock);
|
|
/*
|
|
* Just check if we are not logged in. We cannot check for
|
|
* the phase because the reset could come from a ioctl.
|
|
*/
|
|
if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
|
|
goto unlock;
|
|
conn = session->leadconn;
|
|
|
|
/* only have one tmf outstanding at a time */
|
|
if (conn->tmf_state != TMF_INITIAL)
|
|
goto unlock;
|
|
conn->tmf_state = TMF_QUEUED;
|
|
|
|
hdr = &conn->tmhdr;
|
|
iscsi_prep_lun_reset_pdu(sc, hdr);
|
|
|
|
if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
|
|
session->lu_reset_timeout)) {
|
|
rc = FAILED;
|
|
goto unlock;
|
|
}
|
|
|
|
switch (conn->tmf_state) {
|
|
case TMF_SUCCESS:
|
|
break;
|
|
case TMF_TIMEDOUT:
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
|
|
goto done;
|
|
default:
|
|
conn->tmf_state = TMF_INITIAL;
|
|
goto unlock;
|
|
}
|
|
|
|
rc = SUCCESS;
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
|
|
iscsi_suspend_tx(conn);
|
|
|
|
spin_lock_bh(&session->frwd_lock);
|
|
memset(hdr, 0, sizeof(*hdr));
|
|
fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
|
|
conn->tmf_state = TMF_INITIAL;
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
|
|
iscsi_start_tx(conn);
|
|
goto done;
|
|
|
|
unlock:
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
done:
|
|
ISCSI_DBG_EH(session, "dev reset result = %s\n",
|
|
rc == SUCCESS ? "SUCCESS" : "FAILED");
|
|
mutex_unlock(&session->eh_mutex);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
|
|
|
|
void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
|
|
{
|
|
struct iscsi_session *session = cls_session->dd_data;
|
|
|
|
spin_lock_bh(&session->frwd_lock);
|
|
if (session->state != ISCSI_STATE_LOGGED_IN) {
|
|
session->state = ISCSI_STATE_RECOVERY_FAILED;
|
|
if (session->leadconn)
|
|
wake_up(&session->leadconn->ehwait);
|
|
}
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
|
|
|
|
/**
|
|
* iscsi_eh_session_reset - drop session and attempt relogin
|
|
* @sc: scsi command
|
|
*
|
|
* This function will wait for a relogin, session termination from
|
|
* userspace, or a recovery/replacement timeout.
|
|
*/
|
|
int iscsi_eh_session_reset(struct scsi_cmnd *sc)
|
|
{
|
|
struct iscsi_cls_session *cls_session;
|
|
struct iscsi_session *session;
|
|
struct iscsi_conn *conn;
|
|
|
|
cls_session = starget_to_session(scsi_target(sc->device));
|
|
session = cls_session->dd_data;
|
|
conn = session->leadconn;
|
|
|
|
mutex_lock(&session->eh_mutex);
|
|
spin_lock_bh(&session->frwd_lock);
|
|
if (session->state == ISCSI_STATE_TERMINATE) {
|
|
failed:
|
|
ISCSI_DBG_EH(session,
|
|
"failing session reset: Could not log back into "
|
|
"%s, %s [age %d]\n", session->targetname,
|
|
conn->persistent_address, session->age);
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
mutex_unlock(&session->eh_mutex);
|
|
return FAILED;
|
|
}
|
|
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
mutex_unlock(&session->eh_mutex);
|
|
/*
|
|
* we drop the lock here but the leadconn cannot be destoyed while
|
|
* we are in the scsi eh
|
|
*/
|
|
iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
|
|
|
|
ISCSI_DBG_EH(session, "wait for relogin\n");
|
|
wait_event_interruptible(conn->ehwait,
|
|
session->state == ISCSI_STATE_TERMINATE ||
|
|
session->state == ISCSI_STATE_LOGGED_IN ||
|
|
session->state == ISCSI_STATE_RECOVERY_FAILED);
|
|
if (signal_pending(current))
|
|
flush_signals(current);
|
|
|
|
mutex_lock(&session->eh_mutex);
|
|
spin_lock_bh(&session->frwd_lock);
|
|
if (session->state == ISCSI_STATE_LOGGED_IN) {
|
|
ISCSI_DBG_EH(session,
|
|
"session reset succeeded for %s,%s\n",
|
|
session->targetname, conn->persistent_address);
|
|
} else
|
|
goto failed;
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
mutex_unlock(&session->eh_mutex);
|
|
return SUCCESS;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
|
|
|
|
static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
|
|
{
|
|
memset(hdr, 0, sizeof(*hdr));
|
|
hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
|
|
hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
|
|
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
|
|
hdr->rtt = RESERVED_ITT;
|
|
}
|
|
|
|
/**
|
|
* iscsi_eh_target_reset - reset target
|
|
* @sc: scsi command
|
|
*
|
|
* This will attempt to send a warm target reset.
|
|
*/
|
|
static int iscsi_eh_target_reset(struct scsi_cmnd *sc)
|
|
{
|
|
struct iscsi_cls_session *cls_session;
|
|
struct iscsi_session *session;
|
|
struct iscsi_conn *conn;
|
|
struct iscsi_tm *hdr;
|
|
int rc = FAILED;
|
|
|
|
cls_session = starget_to_session(scsi_target(sc->device));
|
|
session = cls_session->dd_data;
|
|
|
|
ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
|
|
session->targetname);
|
|
|
|
mutex_lock(&session->eh_mutex);
|
|
spin_lock_bh(&session->frwd_lock);
|
|
/*
|
|
* Just check if we are not logged in. We cannot check for
|
|
* the phase because the reset could come from a ioctl.
|
|
*/
|
|
if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
|
|
goto unlock;
|
|
conn = session->leadconn;
|
|
|
|
/* only have one tmf outstanding at a time */
|
|
if (conn->tmf_state != TMF_INITIAL)
|
|
goto unlock;
|
|
conn->tmf_state = TMF_QUEUED;
|
|
|
|
hdr = &conn->tmhdr;
|
|
iscsi_prep_tgt_reset_pdu(sc, hdr);
|
|
|
|
if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
|
|
session->tgt_reset_timeout)) {
|
|
rc = FAILED;
|
|
goto unlock;
|
|
}
|
|
|
|
switch (conn->tmf_state) {
|
|
case TMF_SUCCESS:
|
|
break;
|
|
case TMF_TIMEDOUT:
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
|
|
goto done;
|
|
default:
|
|
conn->tmf_state = TMF_INITIAL;
|
|
goto unlock;
|
|
}
|
|
|
|
rc = SUCCESS;
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
|
|
iscsi_suspend_tx(conn);
|
|
|
|
spin_lock_bh(&session->frwd_lock);
|
|
memset(hdr, 0, sizeof(*hdr));
|
|
fail_scsi_tasks(conn, -1, DID_ERROR);
|
|
conn->tmf_state = TMF_INITIAL;
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
|
|
iscsi_start_tx(conn);
|
|
goto done;
|
|
|
|
unlock:
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
done:
|
|
ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
|
|
rc == SUCCESS ? "SUCCESS" : "FAILED");
|
|
mutex_unlock(&session->eh_mutex);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* iscsi_eh_recover_target - reset target and possibly the session
|
|
* @sc: scsi command
|
|
*
|
|
* This will attempt to send a warm target reset. If that fails,
|
|
* we will escalate to ERL0 session recovery.
|
|
*/
|
|
int iscsi_eh_recover_target(struct scsi_cmnd *sc)
|
|
{
|
|
int rc;
|
|
|
|
rc = iscsi_eh_target_reset(sc);
|
|
if (rc == FAILED)
|
|
rc = iscsi_eh_session_reset(sc);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
|
|
|
|
/*
|
|
* Pre-allocate a pool of @max items of @item_size. By default, the pool
|
|
* should be accessed via kfifo_{get,put} on q->queue.
|
|
* Optionally, the caller can obtain the array of object pointers
|
|
* by passing in a non-NULL @items pointer
|
|
*/
|
|
int
|
|
iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
|
|
{
|
|
int i, num_arrays = 1;
|
|
|
|
memset(q, 0, sizeof(*q));
|
|
|
|
q->max = max;
|
|
|
|
/* If the user passed an items pointer, he wants a copy of
|
|
* the array. */
|
|
if (items)
|
|
num_arrays++;
|
|
q->pool = kvzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
|
|
if (q->pool == NULL)
|
|
return -ENOMEM;
|
|
|
|
kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
|
|
|
|
for (i = 0; i < max; i++) {
|
|
q->pool[i] = kzalloc(item_size, GFP_KERNEL);
|
|
if (q->pool[i] == NULL) {
|
|
q->max = i;
|
|
goto enomem;
|
|
}
|
|
kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
|
|
}
|
|
|
|
if (items) {
|
|
*items = q->pool + max;
|
|
memcpy(*items, q->pool, max * sizeof(void *));
|
|
}
|
|
|
|
return 0;
|
|
|
|
enomem:
|
|
iscsi_pool_free(q);
|
|
return -ENOMEM;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_pool_init);
|
|
|
|
void iscsi_pool_free(struct iscsi_pool *q)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < q->max; i++)
|
|
kfree(q->pool[i]);
|
|
kvfree(q->pool);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_pool_free);
|
|
|
|
/**
|
|
* iscsi_host_add - add host to system
|
|
* @shost: scsi host
|
|
* @pdev: parent device
|
|
*
|
|
* This should be called by partial offload and software iscsi drivers
|
|
* to add a host to the system.
|
|
*/
|
|
int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
|
|
{
|
|
if (!shost->can_queue)
|
|
shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
|
|
|
|
if (!shost->cmd_per_lun)
|
|
shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
|
|
|
|
return scsi_add_host(shost, pdev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_host_add);
|
|
|
|
/**
|
|
* iscsi_host_alloc - allocate a host and driver data
|
|
* @sht: scsi host template
|
|
* @dd_data_size: driver host data size
|
|
* @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
|
|
*
|
|
* This should be called by partial offload and software iscsi drivers.
|
|
* To access the driver specific memory use the iscsi_host_priv() macro.
|
|
*/
|
|
struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
|
|
int dd_data_size, bool xmit_can_sleep)
|
|
{
|
|
struct Scsi_Host *shost;
|
|
struct iscsi_host *ihost;
|
|
|
|
shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
|
|
if (!shost)
|
|
return NULL;
|
|
ihost = shost_priv(shost);
|
|
|
|
if (xmit_can_sleep) {
|
|
snprintf(ihost->workq_name, sizeof(ihost->workq_name),
|
|
"iscsi_q_%d", shost->host_no);
|
|
ihost->workq = create_singlethread_workqueue(ihost->workq_name);
|
|
if (!ihost->workq)
|
|
goto free_host;
|
|
}
|
|
|
|
spin_lock_init(&ihost->lock);
|
|
ihost->state = ISCSI_HOST_SETUP;
|
|
ihost->num_sessions = 0;
|
|
init_waitqueue_head(&ihost->session_removal_wq);
|
|
return shost;
|
|
|
|
free_host:
|
|
scsi_host_put(shost);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_host_alloc);
|
|
|
|
static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
|
|
{
|
|
iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
|
|
}
|
|
|
|
/**
|
|
* iscsi_host_remove - remove host and sessions
|
|
* @shost: scsi host
|
|
*
|
|
* If there are any sessions left, this will initiate the removal and wait
|
|
* for the completion.
|
|
*/
|
|
void iscsi_host_remove(struct Scsi_Host *shost)
|
|
{
|
|
struct iscsi_host *ihost = shost_priv(shost);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ihost->lock, flags);
|
|
ihost->state = ISCSI_HOST_REMOVED;
|
|
spin_unlock_irqrestore(&ihost->lock, flags);
|
|
|
|
iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
|
|
wait_event_interruptible(ihost->session_removal_wq,
|
|
ihost->num_sessions == 0);
|
|
if (signal_pending(current))
|
|
flush_signals(current);
|
|
|
|
scsi_remove_host(shost);
|
|
if (ihost->workq)
|
|
destroy_workqueue(ihost->workq);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_host_remove);
|
|
|
|
void iscsi_host_free(struct Scsi_Host *shost)
|
|
{
|
|
struct iscsi_host *ihost = shost_priv(shost);
|
|
|
|
kfree(ihost->netdev);
|
|
kfree(ihost->hwaddress);
|
|
kfree(ihost->initiatorname);
|
|
scsi_host_put(shost);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_host_free);
|
|
|
|
static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
|
|
{
|
|
struct iscsi_host *ihost = shost_priv(shost);
|
|
unsigned long flags;
|
|
|
|
shost = scsi_host_get(shost);
|
|
if (!shost) {
|
|
printk(KERN_ERR "Invalid state. Cannot notify host removal "
|
|
"of session teardown event because host already "
|
|
"removed.\n");
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(&ihost->lock, flags);
|
|
ihost->num_sessions--;
|
|
if (ihost->num_sessions == 0)
|
|
wake_up(&ihost->session_removal_wq);
|
|
spin_unlock_irqrestore(&ihost->lock, flags);
|
|
scsi_host_put(shost);
|
|
}
|
|
|
|
/**
|
|
* iscsi_session_setup - create iscsi cls session and host and session
|
|
* @iscsit: iscsi transport template
|
|
* @shost: scsi host
|
|
* @cmds_max: session can queue
|
|
* @cmd_task_size: LLD task private data size
|
|
* @initial_cmdsn: initial CmdSN
|
|
*
|
|
* This can be used by software iscsi_transports that allocate
|
|
* a session per scsi host.
|
|
*
|
|
* Callers should set cmds_max to the largest total numer (mgmt + scsi) of
|
|
* tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
|
|
* for nop handling and login/logout requests.
|
|
*/
|
|
struct iscsi_cls_session *
|
|
iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
|
|
uint16_t cmds_max, int dd_size, int cmd_task_size,
|
|
uint32_t initial_cmdsn, unsigned int id)
|
|
{
|
|
struct iscsi_host *ihost = shost_priv(shost);
|
|
struct iscsi_session *session;
|
|
struct iscsi_cls_session *cls_session;
|
|
int cmd_i, scsi_cmds, total_cmds = cmds_max;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ihost->lock, flags);
|
|
if (ihost->state == ISCSI_HOST_REMOVED) {
|
|
spin_unlock_irqrestore(&ihost->lock, flags);
|
|
return NULL;
|
|
}
|
|
ihost->num_sessions++;
|
|
spin_unlock_irqrestore(&ihost->lock, flags);
|
|
|
|
if (!total_cmds)
|
|
total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
|
|
/*
|
|
* The iscsi layer needs some tasks for nop handling and tmfs,
|
|
* so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
|
|
* + 1 command for scsi IO.
|
|
*/
|
|
if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
|
|
printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
|
|
"must be a power of two that is at least %d.\n",
|
|
total_cmds, ISCSI_TOTAL_CMDS_MIN);
|
|
goto dec_session_count;
|
|
}
|
|
|
|
if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
|
|
printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
|
|
"must be a power of 2 less than or equal to %d.\n",
|
|
cmds_max, ISCSI_TOTAL_CMDS_MAX);
|
|
total_cmds = ISCSI_TOTAL_CMDS_MAX;
|
|
}
|
|
|
|
if (!is_power_of_2(total_cmds)) {
|
|
printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
|
|
"must be a power of 2.\n", total_cmds);
|
|
total_cmds = rounddown_pow_of_two(total_cmds);
|
|
if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
|
|
return NULL;
|
|
printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
|
|
total_cmds);
|
|
}
|
|
scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
|
|
|
|
cls_session = iscsi_alloc_session(shost, iscsit,
|
|
sizeof(struct iscsi_session) +
|
|
dd_size);
|
|
if (!cls_session)
|
|
goto dec_session_count;
|
|
session = cls_session->dd_data;
|
|
session->cls_session = cls_session;
|
|
session->host = shost;
|
|
session->state = ISCSI_STATE_FREE;
|
|
session->fast_abort = 1;
|
|
session->tgt_reset_timeout = 30;
|
|
session->lu_reset_timeout = 15;
|
|
session->abort_timeout = 10;
|
|
session->scsi_cmds_max = scsi_cmds;
|
|
session->cmds_max = total_cmds;
|
|
session->queued_cmdsn = session->cmdsn = initial_cmdsn;
|
|
session->exp_cmdsn = initial_cmdsn + 1;
|
|
session->max_cmdsn = initial_cmdsn + 1;
|
|
session->max_r2t = 1;
|
|
session->tt = iscsit;
|
|
session->dd_data = cls_session->dd_data + sizeof(*session);
|
|
|
|
mutex_init(&session->eh_mutex);
|
|
spin_lock_init(&session->frwd_lock);
|
|
spin_lock_init(&session->back_lock);
|
|
|
|
/* initialize SCSI PDU commands pool */
|
|
if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
|
|
(void***)&session->cmds,
|
|
cmd_task_size + sizeof(struct iscsi_task)))
|
|
goto cmdpool_alloc_fail;
|
|
|
|
/* pre-format cmds pool with ITT */
|
|
for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
|
|
struct iscsi_task *task = session->cmds[cmd_i];
|
|
|
|
if (cmd_task_size)
|
|
task->dd_data = &task[1];
|
|
task->itt = cmd_i;
|
|
task->state = ISCSI_TASK_FREE;
|
|
INIT_LIST_HEAD(&task->running);
|
|
}
|
|
|
|
if (!try_module_get(iscsit->owner))
|
|
goto module_get_fail;
|
|
|
|
if (iscsi_add_session(cls_session, id))
|
|
goto cls_session_fail;
|
|
|
|
return cls_session;
|
|
|
|
cls_session_fail:
|
|
module_put(iscsit->owner);
|
|
module_get_fail:
|
|
iscsi_pool_free(&session->cmdpool);
|
|
cmdpool_alloc_fail:
|
|
iscsi_free_session(cls_session);
|
|
dec_session_count:
|
|
iscsi_host_dec_session_cnt(shost);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_session_setup);
|
|
|
|
/**
|
|
* iscsi_session_teardown - destroy session, host, and cls_session
|
|
* @cls_session: iscsi session
|
|
*
|
|
* The driver must have called iscsi_remove_session before
|
|
* calling this.
|
|
*/
|
|
void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
|
|
{
|
|
struct iscsi_session *session = cls_session->dd_data;
|
|
struct module *owner = cls_session->transport->owner;
|
|
struct Scsi_Host *shost = session->host;
|
|
|
|
iscsi_pool_free(&session->cmdpool);
|
|
|
|
kfree(session->password);
|
|
kfree(session->password_in);
|
|
kfree(session->username);
|
|
kfree(session->username_in);
|
|
kfree(session->targetname);
|
|
kfree(session->targetalias);
|
|
kfree(session->initiatorname);
|
|
kfree(session->boot_root);
|
|
kfree(session->boot_nic);
|
|
kfree(session->boot_target);
|
|
kfree(session->ifacename);
|
|
kfree(session->portal_type);
|
|
kfree(session->discovery_parent_type);
|
|
|
|
iscsi_destroy_session(cls_session);
|
|
iscsi_host_dec_session_cnt(shost);
|
|
module_put(owner);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_session_teardown);
|
|
|
|
/**
|
|
* iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
|
|
* @cls_session: iscsi_cls_session
|
|
* @dd_size: private driver data size
|
|
* @conn_idx: cid
|
|
*/
|
|
struct iscsi_cls_conn *
|
|
iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
|
|
uint32_t conn_idx)
|
|
{
|
|
struct iscsi_session *session = cls_session->dd_data;
|
|
struct iscsi_conn *conn;
|
|
struct iscsi_cls_conn *cls_conn;
|
|
char *data;
|
|
|
|
cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
|
|
conn_idx);
|
|
if (!cls_conn)
|
|
return NULL;
|
|
conn = cls_conn->dd_data;
|
|
memset(conn, 0, sizeof(*conn) + dd_size);
|
|
|
|
conn->dd_data = cls_conn->dd_data + sizeof(*conn);
|
|
conn->session = session;
|
|
conn->cls_conn = cls_conn;
|
|
conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
|
|
conn->id = conn_idx;
|
|
conn->exp_statsn = 0;
|
|
conn->tmf_state = TMF_INITIAL;
|
|
|
|
init_timer(&conn->transport_timer);
|
|
conn->transport_timer.data = (unsigned long)conn;
|
|
conn->transport_timer.function = iscsi_check_transport_timeouts;
|
|
|
|
INIT_LIST_HEAD(&conn->mgmtqueue);
|
|
INIT_LIST_HEAD(&conn->cmdqueue);
|
|
INIT_LIST_HEAD(&conn->requeue);
|
|
spin_lock_init(&conn->taskqueuelock);
|
|
INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
|
|
|
|
/* allocate login_task used for the login/text sequences */
|
|
spin_lock_bh(&session->frwd_lock);
|
|
if (!kfifo_out(&session->cmdpool.queue,
|
|
(void*)&conn->login_task,
|
|
sizeof(void*))) {
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
goto login_task_alloc_fail;
|
|
}
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
|
|
data = (char *) __get_free_pages(GFP_KERNEL,
|
|
get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
|
|
if (!data)
|
|
goto login_task_data_alloc_fail;
|
|
conn->login_task->data = conn->data = data;
|
|
|
|
init_timer(&conn->tmf_timer);
|
|
init_waitqueue_head(&conn->ehwait);
|
|
|
|
return cls_conn;
|
|
|
|
login_task_data_alloc_fail:
|
|
kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
|
|
sizeof(void*));
|
|
login_task_alloc_fail:
|
|
iscsi_destroy_conn(cls_conn);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_setup);
|
|
|
|
/**
|
|
* iscsi_conn_teardown - teardown iscsi connection
|
|
* cls_conn: iscsi class connection
|
|
*
|
|
* TODO: we may need to make this into a two step process
|
|
* like scsi-mls remove + put host
|
|
*/
|
|
void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
del_timer_sync(&conn->transport_timer);
|
|
|
|
mutex_lock(&session->eh_mutex);
|
|
spin_lock_bh(&session->frwd_lock);
|
|
conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
|
|
if (session->leadconn == conn) {
|
|
/*
|
|
* leading connection? then give up on recovery.
|
|
*/
|
|
session->state = ISCSI_STATE_TERMINATE;
|
|
wake_up(&conn->ehwait);
|
|
}
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
|
|
/* flush queued up work because we free the connection below */
|
|
iscsi_suspend_tx(conn);
|
|
|
|
spin_lock_bh(&session->frwd_lock);
|
|
free_pages((unsigned long) conn->data,
|
|
get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
|
|
kfree(conn->persistent_address);
|
|
kfree(conn->local_ipaddr);
|
|
/* regular RX path uses back_lock */
|
|
spin_lock_bh(&session->back_lock);
|
|
kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
|
|
sizeof(void*));
|
|
spin_unlock_bh(&session->back_lock);
|
|
if (session->leadconn == conn)
|
|
session->leadconn = NULL;
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
mutex_unlock(&session->eh_mutex);
|
|
|
|
iscsi_destroy_conn(cls_conn);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
|
|
|
|
int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
if (!session) {
|
|
iscsi_conn_printk(KERN_ERR, conn,
|
|
"can't start unbound connection\n");
|
|
return -EPERM;
|
|
}
|
|
|
|
if ((session->imm_data_en || !session->initial_r2t_en) &&
|
|
session->first_burst > session->max_burst) {
|
|
iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
|
|
"first_burst %d max_burst %d\n",
|
|
session->first_burst, session->max_burst);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (conn->ping_timeout && !conn->recv_timeout) {
|
|
iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
|
|
"zero. Using 5 seconds\n.");
|
|
conn->recv_timeout = 5;
|
|
}
|
|
|
|
if (conn->recv_timeout && !conn->ping_timeout) {
|
|
iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
|
|
"zero. Using 5 seconds.\n");
|
|
conn->ping_timeout = 5;
|
|
}
|
|
|
|
spin_lock_bh(&session->frwd_lock);
|
|
conn->c_stage = ISCSI_CONN_STARTED;
|
|
session->state = ISCSI_STATE_LOGGED_IN;
|
|
session->queued_cmdsn = session->cmdsn;
|
|
|
|
conn->last_recv = jiffies;
|
|
conn->last_ping = jiffies;
|
|
if (conn->recv_timeout && conn->ping_timeout)
|
|
mod_timer(&conn->transport_timer,
|
|
jiffies + (conn->recv_timeout * HZ));
|
|
|
|
switch(conn->stop_stage) {
|
|
case STOP_CONN_RECOVER:
|
|
/*
|
|
* unblock eh_abort() if it is blocked. re-try all
|
|
* commands after successful recovery
|
|
*/
|
|
conn->stop_stage = 0;
|
|
conn->tmf_state = TMF_INITIAL;
|
|
session->age++;
|
|
if (session->age == 16)
|
|
session->age = 0;
|
|
break;
|
|
case STOP_CONN_TERM:
|
|
conn->stop_stage = 0;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
|
|
iscsi_unblock_session(session->cls_session);
|
|
wake_up(&conn->ehwait);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_start);
|
|
|
|
static void
|
|
fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_task *task;
|
|
int i, state;
|
|
|
|
for (i = 0; i < conn->session->cmds_max; i++) {
|
|
task = conn->session->cmds[i];
|
|
if (task->sc)
|
|
continue;
|
|
|
|
if (task->state == ISCSI_TASK_FREE)
|
|
continue;
|
|
|
|
ISCSI_DBG_SESSION(conn->session,
|
|
"failing mgmt itt 0x%x state %d\n",
|
|
task->itt, task->state);
|
|
state = ISCSI_TASK_ABRT_SESS_RECOV;
|
|
if (task->state == ISCSI_TASK_PENDING)
|
|
state = ISCSI_TASK_COMPLETED;
|
|
iscsi_complete_task(task, state);
|
|
|
|
}
|
|
}
|
|
|
|
static void iscsi_start_session_recovery(struct iscsi_session *session,
|
|
struct iscsi_conn *conn, int flag)
|
|
{
|
|
int old_stop_stage;
|
|
|
|
mutex_lock(&session->eh_mutex);
|
|
spin_lock_bh(&session->frwd_lock);
|
|
if (conn->stop_stage == STOP_CONN_TERM) {
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
mutex_unlock(&session->eh_mutex);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* When this is called for the in_login state, we only want to clean
|
|
* up the login task and connection. We do not need to block and set
|
|
* the recovery state again
|
|
*/
|
|
if (flag == STOP_CONN_TERM)
|
|
session->state = ISCSI_STATE_TERMINATE;
|
|
else if (conn->stop_stage != STOP_CONN_RECOVER)
|
|
session->state = ISCSI_STATE_IN_RECOVERY;
|
|
|
|
old_stop_stage = conn->stop_stage;
|
|
conn->stop_stage = flag;
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
|
|
del_timer_sync(&conn->transport_timer);
|
|
iscsi_suspend_tx(conn);
|
|
|
|
spin_lock_bh(&session->frwd_lock);
|
|
conn->c_stage = ISCSI_CONN_STOPPED;
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
|
|
/*
|
|
* for connection level recovery we should not calculate
|
|
* header digest. conn->hdr_size used for optimization
|
|
* in hdr_extract() and will be re-negotiated at
|
|
* set_param() time.
|
|
*/
|
|
if (flag == STOP_CONN_RECOVER) {
|
|
conn->hdrdgst_en = 0;
|
|
conn->datadgst_en = 0;
|
|
if (session->state == ISCSI_STATE_IN_RECOVERY &&
|
|
old_stop_stage != STOP_CONN_RECOVER) {
|
|
ISCSI_DBG_SESSION(session, "blocking session\n");
|
|
iscsi_block_session(session->cls_session);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* flush queues.
|
|
*/
|
|
spin_lock_bh(&session->frwd_lock);
|
|
fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
|
|
fail_mgmt_tasks(session, conn);
|
|
memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
mutex_unlock(&session->eh_mutex);
|
|
}
|
|
|
|
void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_session *session = conn->session;
|
|
|
|
switch (flag) {
|
|
case STOP_CONN_RECOVER:
|
|
case STOP_CONN_TERM:
|
|
iscsi_start_session_recovery(session, conn, flag);
|
|
break;
|
|
default:
|
|
iscsi_conn_printk(KERN_ERR, conn,
|
|
"invalid stop flag %d\n", flag);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_stop);
|
|
|
|
int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
|
|
struct iscsi_cls_conn *cls_conn, int is_leading)
|
|
{
|
|
struct iscsi_session *session = cls_session->dd_data;
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
|
|
spin_lock_bh(&session->frwd_lock);
|
|
if (is_leading)
|
|
session->leadconn = conn;
|
|
spin_unlock_bh(&session->frwd_lock);
|
|
|
|
/*
|
|
* Unblock xmitworker(), Login Phase will pass through.
|
|
*/
|
|
clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
|
|
clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_bind);
|
|
|
|
int iscsi_switch_str_param(char **param, char *new_val_buf)
|
|
{
|
|
char *new_val;
|
|
|
|
if (*param) {
|
|
if (!strcmp(*param, new_val_buf))
|
|
return 0;
|
|
}
|
|
|
|
new_val = kstrdup(new_val_buf, GFP_NOIO);
|
|
if (!new_val)
|
|
return -ENOMEM;
|
|
|
|
kfree(*param);
|
|
*param = new_val;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
|
|
|
|
int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
|
|
enum iscsi_param param, char *buf, int buflen)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iscsi_session *session = conn->session;
|
|
int val;
|
|
|
|
switch(param) {
|
|
case ISCSI_PARAM_FAST_ABORT:
|
|
sscanf(buf, "%d", &session->fast_abort);
|
|
break;
|
|
case ISCSI_PARAM_ABORT_TMO:
|
|
sscanf(buf, "%d", &session->abort_timeout);
|
|
break;
|
|
case ISCSI_PARAM_LU_RESET_TMO:
|
|
sscanf(buf, "%d", &session->lu_reset_timeout);
|
|
break;
|
|
case ISCSI_PARAM_TGT_RESET_TMO:
|
|
sscanf(buf, "%d", &session->tgt_reset_timeout);
|
|
break;
|
|
case ISCSI_PARAM_PING_TMO:
|
|
sscanf(buf, "%d", &conn->ping_timeout);
|
|
break;
|
|
case ISCSI_PARAM_RECV_TMO:
|
|
sscanf(buf, "%d", &conn->recv_timeout);
|
|
break;
|
|
case ISCSI_PARAM_MAX_RECV_DLENGTH:
|
|
sscanf(buf, "%d", &conn->max_recv_dlength);
|
|
break;
|
|
case ISCSI_PARAM_MAX_XMIT_DLENGTH:
|
|
sscanf(buf, "%d", &conn->max_xmit_dlength);
|
|
break;
|
|
case ISCSI_PARAM_HDRDGST_EN:
|
|
sscanf(buf, "%d", &conn->hdrdgst_en);
|
|
break;
|
|
case ISCSI_PARAM_DATADGST_EN:
|
|
sscanf(buf, "%d", &conn->datadgst_en);
|
|
break;
|
|
case ISCSI_PARAM_INITIAL_R2T_EN:
|
|
sscanf(buf, "%d", &session->initial_r2t_en);
|
|
break;
|
|
case ISCSI_PARAM_MAX_R2T:
|
|
sscanf(buf, "%hu", &session->max_r2t);
|
|
break;
|
|
case ISCSI_PARAM_IMM_DATA_EN:
|
|
sscanf(buf, "%d", &session->imm_data_en);
|
|
break;
|
|
case ISCSI_PARAM_FIRST_BURST:
|
|
sscanf(buf, "%d", &session->first_burst);
|
|
break;
|
|
case ISCSI_PARAM_MAX_BURST:
|
|
sscanf(buf, "%d", &session->max_burst);
|
|
break;
|
|
case ISCSI_PARAM_PDU_INORDER_EN:
|
|
sscanf(buf, "%d", &session->pdu_inorder_en);
|
|
break;
|
|
case ISCSI_PARAM_DATASEQ_INORDER_EN:
|
|
sscanf(buf, "%d", &session->dataseq_inorder_en);
|
|
break;
|
|
case ISCSI_PARAM_ERL:
|
|
sscanf(buf, "%d", &session->erl);
|
|
break;
|
|
case ISCSI_PARAM_EXP_STATSN:
|
|
sscanf(buf, "%u", &conn->exp_statsn);
|
|
break;
|
|
case ISCSI_PARAM_USERNAME:
|
|
return iscsi_switch_str_param(&session->username, buf);
|
|
case ISCSI_PARAM_USERNAME_IN:
|
|
return iscsi_switch_str_param(&session->username_in, buf);
|
|
case ISCSI_PARAM_PASSWORD:
|
|
return iscsi_switch_str_param(&session->password, buf);
|
|
case ISCSI_PARAM_PASSWORD_IN:
|
|
return iscsi_switch_str_param(&session->password_in, buf);
|
|
case ISCSI_PARAM_TARGET_NAME:
|
|
return iscsi_switch_str_param(&session->targetname, buf);
|
|
case ISCSI_PARAM_TARGET_ALIAS:
|
|
return iscsi_switch_str_param(&session->targetalias, buf);
|
|
case ISCSI_PARAM_TPGT:
|
|
sscanf(buf, "%d", &session->tpgt);
|
|
break;
|
|
case ISCSI_PARAM_PERSISTENT_PORT:
|
|
sscanf(buf, "%d", &conn->persistent_port);
|
|
break;
|
|
case ISCSI_PARAM_PERSISTENT_ADDRESS:
|
|
return iscsi_switch_str_param(&conn->persistent_address, buf);
|
|
case ISCSI_PARAM_IFACE_NAME:
|
|
return iscsi_switch_str_param(&session->ifacename, buf);
|
|
case ISCSI_PARAM_INITIATOR_NAME:
|
|
return iscsi_switch_str_param(&session->initiatorname, buf);
|
|
case ISCSI_PARAM_BOOT_ROOT:
|
|
return iscsi_switch_str_param(&session->boot_root, buf);
|
|
case ISCSI_PARAM_BOOT_NIC:
|
|
return iscsi_switch_str_param(&session->boot_nic, buf);
|
|
case ISCSI_PARAM_BOOT_TARGET:
|
|
return iscsi_switch_str_param(&session->boot_target, buf);
|
|
case ISCSI_PARAM_PORTAL_TYPE:
|
|
return iscsi_switch_str_param(&session->portal_type, buf);
|
|
case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
|
|
return iscsi_switch_str_param(&session->discovery_parent_type,
|
|
buf);
|
|
case ISCSI_PARAM_DISCOVERY_SESS:
|
|
sscanf(buf, "%d", &val);
|
|
session->discovery_sess = !!val;
|
|
break;
|
|
case ISCSI_PARAM_LOCAL_IPADDR:
|
|
return iscsi_switch_str_param(&conn->local_ipaddr, buf);
|
|
default:
|
|
return -ENOSYS;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_set_param);
|
|
|
|
int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
|
|
enum iscsi_param param, char *buf)
|
|
{
|
|
struct iscsi_session *session = cls_session->dd_data;
|
|
int len;
|
|
|
|
switch(param) {
|
|
case ISCSI_PARAM_FAST_ABORT:
|
|
len = sprintf(buf, "%d\n", session->fast_abort);
|
|
break;
|
|
case ISCSI_PARAM_ABORT_TMO:
|
|
len = sprintf(buf, "%d\n", session->abort_timeout);
|
|
break;
|
|
case ISCSI_PARAM_LU_RESET_TMO:
|
|
len = sprintf(buf, "%d\n", session->lu_reset_timeout);
|
|
break;
|
|
case ISCSI_PARAM_TGT_RESET_TMO:
|
|
len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
|
|
break;
|
|
case ISCSI_PARAM_INITIAL_R2T_EN:
|
|
len = sprintf(buf, "%d\n", session->initial_r2t_en);
|
|
break;
|
|
case ISCSI_PARAM_MAX_R2T:
|
|
len = sprintf(buf, "%hu\n", session->max_r2t);
|
|
break;
|
|
case ISCSI_PARAM_IMM_DATA_EN:
|
|
len = sprintf(buf, "%d\n", session->imm_data_en);
|
|
break;
|
|
case ISCSI_PARAM_FIRST_BURST:
|
|
len = sprintf(buf, "%u\n", session->first_burst);
|
|
break;
|
|
case ISCSI_PARAM_MAX_BURST:
|
|
len = sprintf(buf, "%u\n", session->max_burst);
|
|
break;
|
|
case ISCSI_PARAM_PDU_INORDER_EN:
|
|
len = sprintf(buf, "%d\n", session->pdu_inorder_en);
|
|
break;
|
|
case ISCSI_PARAM_DATASEQ_INORDER_EN:
|
|
len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
|
|
break;
|
|
case ISCSI_PARAM_DEF_TASKMGMT_TMO:
|
|
len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo);
|
|
break;
|
|
case ISCSI_PARAM_ERL:
|
|
len = sprintf(buf, "%d\n", session->erl);
|
|
break;
|
|
case ISCSI_PARAM_TARGET_NAME:
|
|
len = sprintf(buf, "%s\n", session->targetname);
|
|
break;
|
|
case ISCSI_PARAM_TARGET_ALIAS:
|
|
len = sprintf(buf, "%s\n", session->targetalias);
|
|
break;
|
|
case ISCSI_PARAM_TPGT:
|
|
len = sprintf(buf, "%d\n", session->tpgt);
|
|
break;
|
|
case ISCSI_PARAM_USERNAME:
|
|
len = sprintf(buf, "%s\n", session->username);
|
|
break;
|
|
case ISCSI_PARAM_USERNAME_IN:
|
|
len = sprintf(buf, "%s\n", session->username_in);
|
|
break;
|
|
case ISCSI_PARAM_PASSWORD:
|
|
len = sprintf(buf, "%s\n", session->password);
|
|
break;
|
|
case ISCSI_PARAM_PASSWORD_IN:
|
|
len = sprintf(buf, "%s\n", session->password_in);
|
|
break;
|
|
case ISCSI_PARAM_IFACE_NAME:
|
|
len = sprintf(buf, "%s\n", session->ifacename);
|
|
break;
|
|
case ISCSI_PARAM_INITIATOR_NAME:
|
|
len = sprintf(buf, "%s\n", session->initiatorname);
|
|
break;
|
|
case ISCSI_PARAM_BOOT_ROOT:
|
|
len = sprintf(buf, "%s\n", session->boot_root);
|
|
break;
|
|
case ISCSI_PARAM_BOOT_NIC:
|
|
len = sprintf(buf, "%s\n", session->boot_nic);
|
|
break;
|
|
case ISCSI_PARAM_BOOT_TARGET:
|
|
len = sprintf(buf, "%s\n", session->boot_target);
|
|
break;
|
|
case ISCSI_PARAM_AUTO_SND_TGT_DISABLE:
|
|
len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable);
|
|
break;
|
|
case ISCSI_PARAM_DISCOVERY_SESS:
|
|
len = sprintf(buf, "%u\n", session->discovery_sess);
|
|
break;
|
|
case ISCSI_PARAM_PORTAL_TYPE:
|
|
len = sprintf(buf, "%s\n", session->portal_type);
|
|
break;
|
|
case ISCSI_PARAM_CHAP_AUTH_EN:
|
|
len = sprintf(buf, "%u\n", session->chap_auth_en);
|
|
break;
|
|
case ISCSI_PARAM_DISCOVERY_LOGOUT_EN:
|
|
len = sprintf(buf, "%u\n", session->discovery_logout_en);
|
|
break;
|
|
case ISCSI_PARAM_BIDI_CHAP_EN:
|
|
len = sprintf(buf, "%u\n", session->bidi_chap_en);
|
|
break;
|
|
case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL:
|
|
len = sprintf(buf, "%u\n", session->discovery_auth_optional);
|
|
break;
|
|
case ISCSI_PARAM_DEF_TIME2WAIT:
|
|
len = sprintf(buf, "%d\n", session->time2wait);
|
|
break;
|
|
case ISCSI_PARAM_DEF_TIME2RETAIN:
|
|
len = sprintf(buf, "%d\n", session->time2retain);
|
|
break;
|
|
case ISCSI_PARAM_TSID:
|
|
len = sprintf(buf, "%u\n", session->tsid);
|
|
break;
|
|
case ISCSI_PARAM_ISID:
|
|
len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n",
|
|
session->isid[0], session->isid[1],
|
|
session->isid[2], session->isid[3],
|
|
session->isid[4], session->isid[5]);
|
|
break;
|
|
case ISCSI_PARAM_DISCOVERY_PARENT_IDX:
|
|
len = sprintf(buf, "%u\n", session->discovery_parent_idx);
|
|
break;
|
|
case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
|
|
if (session->discovery_parent_type)
|
|
len = sprintf(buf, "%s\n",
|
|
session->discovery_parent_type);
|
|
else
|
|
len = sprintf(buf, "\n");
|
|
break;
|
|
default:
|
|
return -ENOSYS;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_session_get_param);
|
|
|
|
int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
|
|
enum iscsi_param param, char *buf)
|
|
{
|
|
struct sockaddr_in6 *sin6 = NULL;
|
|
struct sockaddr_in *sin = NULL;
|
|
int len;
|
|
|
|
switch (addr->ss_family) {
|
|
case AF_INET:
|
|
sin = (struct sockaddr_in *)addr;
|
|
break;
|
|
case AF_INET6:
|
|
sin6 = (struct sockaddr_in6 *)addr;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (param) {
|
|
case ISCSI_PARAM_CONN_ADDRESS:
|
|
case ISCSI_HOST_PARAM_IPADDRESS:
|
|
if (sin)
|
|
len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
|
|
else
|
|
len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
|
|
break;
|
|
case ISCSI_PARAM_CONN_PORT:
|
|
case ISCSI_PARAM_LOCAL_PORT:
|
|
if (sin)
|
|
len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
|
|
else
|
|
len = sprintf(buf, "%hu\n",
|
|
be16_to_cpu(sin6->sin6_port));
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
|
|
|
|
int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
|
|
enum iscsi_param param, char *buf)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
int len;
|
|
|
|
switch(param) {
|
|
case ISCSI_PARAM_PING_TMO:
|
|
len = sprintf(buf, "%u\n", conn->ping_timeout);
|
|
break;
|
|
case ISCSI_PARAM_RECV_TMO:
|
|
len = sprintf(buf, "%u\n", conn->recv_timeout);
|
|
break;
|
|
case ISCSI_PARAM_MAX_RECV_DLENGTH:
|
|
len = sprintf(buf, "%u\n", conn->max_recv_dlength);
|
|
break;
|
|
case ISCSI_PARAM_MAX_XMIT_DLENGTH:
|
|
len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
|
|
break;
|
|
case ISCSI_PARAM_HDRDGST_EN:
|
|
len = sprintf(buf, "%d\n", conn->hdrdgst_en);
|
|
break;
|
|
case ISCSI_PARAM_DATADGST_EN:
|
|
len = sprintf(buf, "%d\n", conn->datadgst_en);
|
|
break;
|
|
case ISCSI_PARAM_IFMARKER_EN:
|
|
len = sprintf(buf, "%d\n", conn->ifmarker_en);
|
|
break;
|
|
case ISCSI_PARAM_OFMARKER_EN:
|
|
len = sprintf(buf, "%d\n", conn->ofmarker_en);
|
|
break;
|
|
case ISCSI_PARAM_EXP_STATSN:
|
|
len = sprintf(buf, "%u\n", conn->exp_statsn);
|
|
break;
|
|
case ISCSI_PARAM_PERSISTENT_PORT:
|
|
len = sprintf(buf, "%d\n", conn->persistent_port);
|
|
break;
|
|
case ISCSI_PARAM_PERSISTENT_ADDRESS:
|
|
len = sprintf(buf, "%s\n", conn->persistent_address);
|
|
break;
|
|
case ISCSI_PARAM_STATSN:
|
|
len = sprintf(buf, "%u\n", conn->statsn);
|
|
break;
|
|
case ISCSI_PARAM_MAX_SEGMENT_SIZE:
|
|
len = sprintf(buf, "%u\n", conn->max_segment_size);
|
|
break;
|
|
case ISCSI_PARAM_KEEPALIVE_TMO:
|
|
len = sprintf(buf, "%u\n", conn->keepalive_tmo);
|
|
break;
|
|
case ISCSI_PARAM_LOCAL_PORT:
|
|
len = sprintf(buf, "%u\n", conn->local_port);
|
|
break;
|
|
case ISCSI_PARAM_TCP_TIMESTAMP_STAT:
|
|
len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat);
|
|
break;
|
|
case ISCSI_PARAM_TCP_NAGLE_DISABLE:
|
|
len = sprintf(buf, "%u\n", conn->tcp_nagle_disable);
|
|
break;
|
|
case ISCSI_PARAM_TCP_WSF_DISABLE:
|
|
len = sprintf(buf, "%u\n", conn->tcp_wsf_disable);
|
|
break;
|
|
case ISCSI_PARAM_TCP_TIMER_SCALE:
|
|
len = sprintf(buf, "%u\n", conn->tcp_timer_scale);
|
|
break;
|
|
case ISCSI_PARAM_TCP_TIMESTAMP_EN:
|
|
len = sprintf(buf, "%u\n", conn->tcp_timestamp_en);
|
|
break;
|
|
case ISCSI_PARAM_IP_FRAGMENT_DISABLE:
|
|
len = sprintf(buf, "%u\n", conn->fragment_disable);
|
|
break;
|
|
case ISCSI_PARAM_IPV4_TOS:
|
|
len = sprintf(buf, "%u\n", conn->ipv4_tos);
|
|
break;
|
|
case ISCSI_PARAM_IPV6_TC:
|
|
len = sprintf(buf, "%u\n", conn->ipv6_traffic_class);
|
|
break;
|
|
case ISCSI_PARAM_IPV6_FLOW_LABEL:
|
|
len = sprintf(buf, "%u\n", conn->ipv6_flow_label);
|
|
break;
|
|
case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6:
|
|
len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6);
|
|
break;
|
|
case ISCSI_PARAM_TCP_XMIT_WSF:
|
|
len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf);
|
|
break;
|
|
case ISCSI_PARAM_TCP_RECV_WSF:
|
|
len = sprintf(buf, "%u\n", conn->tcp_recv_wsf);
|
|
break;
|
|
case ISCSI_PARAM_LOCAL_IPADDR:
|
|
len = sprintf(buf, "%s\n", conn->local_ipaddr);
|
|
break;
|
|
default:
|
|
return -ENOSYS;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
|
|
|
|
int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
|
|
char *buf)
|
|
{
|
|
struct iscsi_host *ihost = shost_priv(shost);
|
|
int len;
|
|
|
|
switch (param) {
|
|
case ISCSI_HOST_PARAM_NETDEV_NAME:
|
|
len = sprintf(buf, "%s\n", ihost->netdev);
|
|
break;
|
|
case ISCSI_HOST_PARAM_HWADDRESS:
|
|
len = sprintf(buf, "%s\n", ihost->hwaddress);
|
|
break;
|
|
case ISCSI_HOST_PARAM_INITIATOR_NAME:
|
|
len = sprintf(buf, "%s\n", ihost->initiatorname);
|
|
break;
|
|
default:
|
|
return -ENOSYS;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_host_get_param);
|
|
|
|
int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
|
|
char *buf, int buflen)
|
|
{
|
|
struct iscsi_host *ihost = shost_priv(shost);
|
|
|
|
switch (param) {
|
|
case ISCSI_HOST_PARAM_NETDEV_NAME:
|
|
return iscsi_switch_str_param(&ihost->netdev, buf);
|
|
case ISCSI_HOST_PARAM_HWADDRESS:
|
|
return iscsi_switch_str_param(&ihost->hwaddress, buf);
|
|
case ISCSI_HOST_PARAM_INITIATOR_NAME:
|
|
return iscsi_switch_str_param(&ihost->initiatorname, buf);
|
|
default:
|
|
return -ENOSYS;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iscsi_host_set_param);
|
|
|
|
MODULE_AUTHOR("Mike Christie");
|
|
MODULE_DESCRIPTION("iSCSI library functions");
|
|
MODULE_LICENSE("GPL");
|