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linux/drivers/scsi/ibmvscsi/ibmvfc.c
Mike Christie e881a172da [SCSI] modify change_queue_depth to take in reason why it is being called 
This patch modifies scsi_host_template->change_queue_depth so that
it takes an argument indicating why it is being called. This will be
used so that if a LLD needs to do some extra processing when
handling queue fulls or later ramp ups, it can do so.

This is a simple port of the drivers setting a change_queue_depth
callback. In the patch I just have these LLDs adjust the queue depth
if the user was requesting it.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>

[Vasu.Dev: v2
	Also converted pmcraid_change_queue_depth and then verified
all modules compile  using "make allmodconfig" for any new build
warnings on X86_64.

	Updated original description after combing two original
patches from Mike to make this patch git bisectable.]
Signed-off-by: Vasu Dev <vasu.dev@intel.com>
[jejb: fixed up 53c700]
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-12-04 12:00:41 -06:00

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/*
* ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
*
* Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
*
* Copyright (C) IBM Corporation, 2008
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/kthread.h>
#include <linux/of.h>
#include <linux/stringify.h>
#include <asm/firmware.h>
#include <asm/irq.h>
#include <asm/vio.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_transport_fc.h>
#include <scsi/scsi_bsg_fc.h>
#include "ibmvfc.h"
static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
static unsigned int max_lun = IBMVFC_MAX_LUN;
static unsigned int max_targets = IBMVFC_MAX_TARGETS;
static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
static unsigned int dev_loss_tmo = IBMVFC_DEV_LOSS_TMO;
static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
static LIST_HEAD(ibmvfc_head);
static DEFINE_SPINLOCK(ibmvfc_driver_lock);
static struct scsi_transport_template *ibmvfc_transport_template;
MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
MODULE_LICENSE("GPL");
MODULE_VERSION(IBMVFC_DRIVER_VERSION);
module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
"[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(default_timeout,
"Default timeout in seconds for initialization and EH commands. "
"[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
module_param_named(max_requests, max_requests, uint, S_IRUGO);
MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
"[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
module_param_named(max_lun, max_lun, uint, S_IRUGO);
MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
"[Default=" __stringify(IBMVFC_MAX_LUN) "]");
module_param_named(max_targets, max_targets, uint, S_IRUGO);
MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
"[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
"[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Enable driver debug information. "
"[Default=" __stringify(IBMVFC_DEBUG) "]");
module_param_named(dev_loss_tmo, dev_loss_tmo, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(dev_loss_tmo, "Maximum number of seconds that the FC "
"transport should insulate the loss of a remote port. Once this "
"value is exceeded, the scsi target is removed. "
"[Default=" __stringify(IBMVFC_DEV_LOSS_TMO) "]");
module_param_named(log_level, log_level, uint, 0);
MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
"[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
static const struct {
u16 status;
u16 error;
u8 result;
u8 retry;
int log;
char *name;
} cmd_status [] = {
{ IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
{ IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
{ IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
{ IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
{ IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
{ IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
{ IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
{ IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
{ IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
{ IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
};
static void ibmvfc_npiv_login(struct ibmvfc_host *);
static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
static void ibmvfc_npiv_logout(struct ibmvfc_host *);
static const char *unknown_error = "unknown error";
#ifdef CONFIG_SCSI_IBMVFC_TRACE
/**
* ibmvfc_trc_start - Log a start trace entry
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_trc_start(struct ibmvfc_event *evt)
{
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
struct ibmvfc_trace_entry *entry;
entry = &vhost->trace[vhost->trace_index++];
entry->evt = evt;
entry->time = jiffies;
entry->fmt = evt->crq.format;
entry->type = IBMVFC_TRC_START;
switch (entry->fmt) {
case IBMVFC_CMD_FORMAT:
entry->op_code = vfc_cmd->iu.cdb[0];
entry->scsi_id = vfc_cmd->tgt_scsi_id;
entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
entry->tmf_flags = vfc_cmd->iu.tmf_flags;
entry->u.start.xfer_len = vfc_cmd->iu.xfer_len;
break;
case IBMVFC_MAD_FORMAT:
entry->op_code = mad->opcode;
break;
default:
break;
};
}
/**
* ibmvfc_trc_end - Log an end trace entry
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_trc_end(struct ibmvfc_event *evt)
{
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];
entry->evt = evt;
entry->time = jiffies;
entry->fmt = evt->crq.format;
entry->type = IBMVFC_TRC_END;
switch (entry->fmt) {
case IBMVFC_CMD_FORMAT:
entry->op_code = vfc_cmd->iu.cdb[0];
entry->scsi_id = vfc_cmd->tgt_scsi_id;
entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
entry->tmf_flags = vfc_cmd->iu.tmf_flags;
entry->u.end.status = vfc_cmd->status;
entry->u.end.error = vfc_cmd->error;
entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
break;
case IBMVFC_MAD_FORMAT:
entry->op_code = mad->opcode;
entry->u.end.status = mad->status;
break;
default:
break;
};
}
#else
#define ibmvfc_trc_start(evt) do { } while (0)
#define ibmvfc_trc_end(evt) do { } while (0)
#endif
/**
* ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
* @status: status / error class
* @error: error
*
* Return value:
* index into cmd_status / -EINVAL on failure
**/
static int ibmvfc_get_err_index(u16 status, u16 error)
{
int i;
for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
if ((cmd_status[i].status & status) == cmd_status[i].status &&
cmd_status[i].error == error)
return i;
return -EINVAL;
}
/**
* ibmvfc_get_cmd_error - Find the error description for the fcp response
* @status: status / error class
* @error: error
*
* Return value:
* error description string
**/
static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
{
int rc = ibmvfc_get_err_index(status, error);
if (rc >= 0)
return cmd_status[rc].name;
return unknown_error;
}
/**
* ibmvfc_get_err_result - Find the scsi status to return for the fcp response
* @vfc_cmd: ibmvfc command struct
*
* Return value:
* SCSI result value to return for completed command
**/
static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
{
int err;
struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
int fc_rsp_len = rsp->fcp_rsp_len;
if ((rsp->flags & FCP_RSP_LEN_VALID) &&
((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
rsp->data.info.rsp_code))
return DID_ERROR << 16;
err = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
if (err >= 0)
return rsp->scsi_status | (cmd_status[err].result << 16);
return rsp->scsi_status | (DID_ERROR << 16);
}
/**
* ibmvfc_retry_cmd - Determine if error status is retryable
* @status: status / error class
* @error: error
*
* Return value:
* 1 if error should be retried / 0 if it should not
**/
static int ibmvfc_retry_cmd(u16 status, u16 error)
{
int rc = ibmvfc_get_err_index(status, error);
if (rc >= 0)
return cmd_status[rc].retry;
return 1;
}
static const char *unknown_fc_explain = "unknown fc explain";
static const struct {
u16 fc_explain;
char *name;
} ls_explain [] = {
{ 0x00, "no additional explanation" },
{ 0x01, "service parameter error - options" },
{ 0x03, "service parameter error - initiator control" },
{ 0x05, "service parameter error - recipient control" },
{ 0x07, "service parameter error - received data field size" },
{ 0x09, "service parameter error - concurrent seq" },
{ 0x0B, "service parameter error - credit" },
{ 0x0D, "invalid N_Port/F_Port_Name" },
{ 0x0E, "invalid node/Fabric Name" },
{ 0x0F, "invalid common service parameters" },
{ 0x11, "invalid association header" },
{ 0x13, "association header required" },
{ 0x15, "invalid originator S_ID" },
{ 0x17, "invalid OX_ID-RX-ID combination" },
{ 0x19, "command (request) already in progress" },
{ 0x1E, "N_Port Login requested" },
{ 0x1F, "Invalid N_Port_ID" },
};
static const struct {
u16 fc_explain;
char *name;
} gs_explain [] = {
{ 0x00, "no additional explanation" },
{ 0x01, "port identifier not registered" },
{ 0x02, "port name not registered" },
{ 0x03, "node name not registered" },
{ 0x04, "class of service not registered" },
{ 0x06, "initial process associator not registered" },
{ 0x07, "FC-4 TYPEs not registered" },
{ 0x08, "symbolic port name not registered" },
{ 0x09, "symbolic node name not registered" },
{ 0x0A, "port type not registered" },
{ 0xF0, "authorization exception" },
{ 0xF1, "authentication exception" },
{ 0xF2, "data base full" },
{ 0xF3, "data base empty" },
{ 0xF4, "processing request" },
{ 0xF5, "unable to verify connection" },
{ 0xF6, "devices not in a common zone" },
};
/**
* ibmvfc_get_ls_explain - Return the FC Explain description text
* @status: FC Explain status
*
* Returns:
* error string
**/
static const char *ibmvfc_get_ls_explain(u16 status)
{
int i;
for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
if (ls_explain[i].fc_explain == status)
return ls_explain[i].name;
return unknown_fc_explain;
}
/**
* ibmvfc_get_gs_explain - Return the FC Explain description text
* @status: FC Explain status
*
* Returns:
* error string
**/
static const char *ibmvfc_get_gs_explain(u16 status)
{
int i;
for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
if (gs_explain[i].fc_explain == status)
return gs_explain[i].name;
return unknown_fc_explain;
}
static const struct {
enum ibmvfc_fc_type fc_type;
char *name;
} fc_type [] = {
{ IBMVFC_FABRIC_REJECT, "fabric reject" },
{ IBMVFC_PORT_REJECT, "port reject" },
{ IBMVFC_LS_REJECT, "ELS reject" },
{ IBMVFC_FABRIC_BUSY, "fabric busy" },
{ IBMVFC_PORT_BUSY, "port busy" },
{ IBMVFC_BASIC_REJECT, "basic reject" },
};
static const char *unknown_fc_type = "unknown fc type";
/**
* ibmvfc_get_fc_type - Return the FC Type description text
* @status: FC Type error status
*
* Returns:
* error string
**/
static const char *ibmvfc_get_fc_type(u16 status)
{
int i;
for (i = 0; i < ARRAY_SIZE(fc_type); i++)
if (fc_type[i].fc_type == status)
return fc_type[i].name;
return unknown_fc_type;
}
/**
* ibmvfc_set_tgt_action - Set the next init action for the target
* @tgt: ibmvfc target struct
* @action: action to perform
*
**/
static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
enum ibmvfc_target_action action)
{
switch (tgt->action) {
case IBMVFC_TGT_ACTION_DEL_RPORT:
break;
default:
if (action == IBMVFC_TGT_ACTION_DEL_RPORT)
tgt->add_rport = 0;
tgt->action = action;
break;
}
}
/**
* ibmvfc_set_host_state - Set the state for the host
* @vhost: ibmvfc host struct
* @state: state to set host to
*
* Returns:
* 0 if state changed / non-zero if not changed
**/
static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
enum ibmvfc_host_state state)
{
int rc = 0;
switch (vhost->state) {
case IBMVFC_HOST_OFFLINE:
rc = -EINVAL;
break;
default:
vhost->state = state;
break;
};
return rc;
}
/**
* ibmvfc_set_host_action - Set the next init action for the host
* @vhost: ibmvfc host struct
* @action: action to perform
*
**/
static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
enum ibmvfc_host_action action)
{
switch (action) {
case IBMVFC_HOST_ACTION_ALLOC_TGTS:
if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
vhost->action = action;
break;
case IBMVFC_HOST_ACTION_LOGO_WAIT:
if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
vhost->action = action;
break;
case IBMVFC_HOST_ACTION_INIT_WAIT:
if (vhost->action == IBMVFC_HOST_ACTION_INIT)
vhost->action = action;
break;
case IBMVFC_HOST_ACTION_QUERY:
switch (vhost->action) {
case IBMVFC_HOST_ACTION_INIT_WAIT:
case IBMVFC_HOST_ACTION_NONE:
case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
vhost->action = action;
break;
default:
break;
};
break;
case IBMVFC_HOST_ACTION_TGT_INIT:
if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
vhost->action = action;
break;
case IBMVFC_HOST_ACTION_LOGO:
case IBMVFC_HOST_ACTION_INIT:
case IBMVFC_HOST_ACTION_TGT_DEL:
case IBMVFC_HOST_ACTION_QUERY_TGTS:
case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
case IBMVFC_HOST_ACTION_NONE:
default:
vhost->action = action;
break;
};
}
/**
* ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
* @vhost: ibmvfc host struct
*
* Return value:
* nothing
**/
static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
{
if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
scsi_block_requests(vhost->host);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
}
} else
vhost->reinit = 1;
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_link_down - Handle a link down event from the adapter
* @vhost: ibmvfc host struct
* @state: ibmvfc host state to enter
*
**/
static void ibmvfc_link_down(struct ibmvfc_host *vhost,
enum ibmvfc_host_state state)
{
struct ibmvfc_target *tgt;
ENTER;
scsi_block_requests(vhost->host);
list_for_each_entry(tgt, &vhost->targets, queue)
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
ibmvfc_set_host_state(vhost, state);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
wake_up(&vhost->work_wait_q);
LEAVE;
}
/**
* ibmvfc_init_host - Start host initialization
* @vhost: ibmvfc host struct
*
* Return value:
* nothing
**/
static void ibmvfc_init_host(struct ibmvfc_host *vhost)
{
struct ibmvfc_target *tgt;
if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
dev_err(vhost->dev,
"Host initialization retries exceeded. Taking adapter offline\n");
ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
return;
}
}
if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
vhost->async_crq.cur = 0;
list_for_each_entry(tgt, &vhost->targets, queue)
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
scsi_block_requests(vhost->host);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
vhost->job_step = ibmvfc_npiv_login;
wake_up(&vhost->work_wait_q);
}
}
/**
* ibmvfc_send_crq - Send a CRQ
* @vhost: ibmvfc host struct
* @word1: the first 64 bits of the data
* @word2: the second 64 bits of the data
*
* Return value:
* 0 on success / other on failure
**/
static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
{
struct vio_dev *vdev = to_vio_dev(vhost->dev);
return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
}
/**
* ibmvfc_send_crq_init - Send a CRQ init message
* @vhost: ibmvfc host struct
*
* Return value:
* 0 on success / other on failure
**/
static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
{
ibmvfc_dbg(vhost, "Sending CRQ init\n");
return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
}
/**
* ibmvfc_send_crq_init_complete - Send a CRQ init complete message
* @vhost: ibmvfc host struct
*
* Return value:
* 0 on success / other on failure
**/
static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
{
ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
}
/**
* ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
* @vhost: ibmvfc host struct
*
* Frees irq, deallocates a page for messages, unmaps dma, and unregisters
* the crq with the hypervisor.
**/
static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
{
long rc;
struct vio_dev *vdev = to_vio_dev(vhost->dev);
struct ibmvfc_crq_queue *crq = &vhost->crq;
ibmvfc_dbg(vhost, "Releasing CRQ\n");
free_irq(vdev->irq, vhost);
tasklet_kill(&vhost->tasklet);
do {
rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
vhost->state = IBMVFC_NO_CRQ;
vhost->logged_in = 0;
dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
free_page((unsigned long)crq->msgs);
}
/**
* ibmvfc_reenable_crq_queue - reenables the CRQ
* @vhost: ibmvfc host struct
*
* Return value:
* 0 on success / other on failure
**/
static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
{
int rc;
struct vio_dev *vdev = to_vio_dev(vhost->dev);
/* Re-enable the CRQ */
do {
rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
} while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
if (rc)
dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
return rc;
}
/**
* ibmvfc_reset_crq - resets a crq after a failure
* @vhost: ibmvfc host struct
*
* Return value:
* 0 on success / other on failure
**/
static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
{
int rc;
struct vio_dev *vdev = to_vio_dev(vhost->dev);
struct ibmvfc_crq_queue *crq = &vhost->crq;
/* Close the CRQ */
do {
rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
vhost->state = IBMVFC_NO_CRQ;
vhost->logged_in = 0;
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
/* Clean out the queue */
memset(crq->msgs, 0, PAGE_SIZE);
crq->cur = 0;
/* And re-open it again */
rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
crq->msg_token, PAGE_SIZE);
if (rc == H_CLOSED)
/* Adapter is good, but other end is not ready */
dev_warn(vhost->dev, "Partner adapter not ready\n");
else if (rc != 0)
dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
return rc;
}
/**
* ibmvfc_valid_event - Determines if event is valid.
* @pool: event_pool that contains the event
* @evt: ibmvfc event to be checked for validity
*
* Return value:
* 1 if event is valid / 0 if event is not valid
**/
static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
struct ibmvfc_event *evt)
{
int index = evt - pool->events;
if (index < 0 || index >= pool->size) /* outside of bounds */
return 0;
if (evt != pool->events + index) /* unaligned */
return 0;
return 1;
}
/**
* ibmvfc_free_event - Free the specified event
* @evt: ibmvfc_event to be freed
*
**/
static void ibmvfc_free_event(struct ibmvfc_event *evt)
{
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_event_pool *pool = &vhost->pool;
BUG_ON(!ibmvfc_valid_event(pool, evt));
BUG_ON(atomic_inc_return(&evt->free) != 1);
list_add_tail(&evt->queue, &vhost->free);
}
/**
* ibmvfc_scsi_eh_done - EH done function for queuecommand commands
* @evt: ibmvfc event struct
*
* This function does not setup any error status, that must be done
* before this function gets called.
**/
static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
{
struct scsi_cmnd *cmnd = evt->cmnd;
if (cmnd) {
scsi_dma_unmap(cmnd);
cmnd->scsi_done(cmnd);
}
if (evt->eh_comp)
complete(evt->eh_comp);
ibmvfc_free_event(evt);
}
/**
* ibmvfc_fail_request - Fail request with specified error code
* @evt: ibmvfc event struct
* @error_code: error code to fail request with
*
* Return value:
* none
**/
static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
{
if (evt->cmnd) {
evt->cmnd->result = (error_code << 16);
evt->done = ibmvfc_scsi_eh_done;
} else
evt->xfer_iu->mad_common.status = IBMVFC_MAD_DRIVER_FAILED;
list_del(&evt->queue);
del_timer(&evt->timer);
ibmvfc_trc_end(evt);
evt->done(evt);
}
/**
* ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
* @vhost: ibmvfc host struct
* @error_code: error code to fail requests with
*
* Return value:
* none
**/
static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
{
struct ibmvfc_event *evt, *pos;
ibmvfc_dbg(vhost, "Purging all requests\n");
list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
ibmvfc_fail_request(evt, error_code);
}
/**
* ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
* @vhost: struct ibmvfc host to reset
**/
static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
{
int rc;
scsi_block_requests(vhost->host);
ibmvfc_purge_requests(vhost, DID_ERROR);
if ((rc = ibmvfc_reset_crq(vhost)) ||
(rc = ibmvfc_send_crq_init(vhost)) ||
(rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
dev_err(vhost->dev, "Error after reset rc=%d\n", rc);
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
} else
ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
}
/**
* __ibmvfc_reset_host - Reset the connection to the server (no locking)
* @vhost: struct ibmvfc host to reset
**/
static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
{
if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
scsi_block_requests(vhost->host);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
vhost->job_step = ibmvfc_npiv_logout;
wake_up(&vhost->work_wait_q);
} else
ibmvfc_hard_reset_host(vhost);
}
/**
* ibmvfc_reset_host - Reset the connection to the server
* @vhost: ibmvfc host struct
**/
static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
{
unsigned long flags;
spin_lock_irqsave(vhost->host->host_lock, flags);
__ibmvfc_reset_host(vhost);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
}
/**
* ibmvfc_retry_host_init - Retry host initialization if allowed
* @vhost: ibmvfc host struct
*
* Returns: 1 if init will be retried / 0 if not
*
**/
static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
{
int retry = 0;
if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
vhost->delay_init = 1;
if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
dev_err(vhost->dev,
"Host initialization retries exceeded. Taking adapter offline\n");
ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
} else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
__ibmvfc_reset_host(vhost);
else {
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
retry = 1;
}
}
wake_up(&vhost->work_wait_q);
return retry;
}
/**
* __ibmvfc_get_target - Find the specified scsi_target (no locking)
* @starget: scsi target struct
*
* Return value:
* ibmvfc_target struct / NULL if not found
**/
static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ibmvfc_host *vhost = shost_priv(shost);
struct ibmvfc_target *tgt;
list_for_each_entry(tgt, &vhost->targets, queue)
if (tgt->target_id == starget->id) {
kref_get(&tgt->kref);
return tgt;
}
return NULL;
}
/**
* ibmvfc_get_target - Find the specified scsi_target
* @starget: scsi target struct
*
* Return value:
* ibmvfc_target struct / NULL if not found
**/
static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ibmvfc_target *tgt;
unsigned long flags;
spin_lock_irqsave(shost->host_lock, flags);
tgt = __ibmvfc_get_target(starget);
spin_unlock_irqrestore(shost->host_lock, flags);
return tgt;
}
/**
* ibmvfc_get_host_speed - Get host port speed
* @shost: scsi host struct
*
* Return value:
* none
**/
static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
{
struct ibmvfc_host *vhost = shost_priv(shost);
unsigned long flags;
spin_lock_irqsave(shost->host_lock, flags);
if (vhost->state == IBMVFC_ACTIVE) {
switch (vhost->login_buf->resp.link_speed / 100) {
case 1:
fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
break;
case 2:
fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
break;
case 4:
fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
break;
case 8:
fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
break;
case 10:
fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
break;
case 16:
fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
break;
default:
ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
vhost->login_buf->resp.link_speed / 100);
fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
break;
}
} else
fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
spin_unlock_irqrestore(shost->host_lock, flags);
}
/**
* ibmvfc_get_host_port_state - Get host port state
* @shost: scsi host struct
*
* Return value:
* none
**/
static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
{
struct ibmvfc_host *vhost = shost_priv(shost);
unsigned long flags;
spin_lock_irqsave(shost->host_lock, flags);
switch (vhost->state) {
case IBMVFC_INITIALIZING:
case IBMVFC_ACTIVE:
fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
break;
case IBMVFC_LINK_DOWN:
fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
break;
case IBMVFC_LINK_DEAD:
case IBMVFC_HOST_OFFLINE:
fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
break;
case IBMVFC_HALTED:
fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
break;
case IBMVFC_NO_CRQ:
fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
break;
default:
ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
break;
}
spin_unlock_irqrestore(shost->host_lock, flags);
}
/**
* ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
* @rport: rport struct
* @timeout: timeout value
*
* Return value:
* none
**/
static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
{
if (timeout)
rport->dev_loss_tmo = timeout;
else
rport->dev_loss_tmo = 1;
}
/**
* ibmvfc_release_tgt - Free memory allocated for a target
* @kref: kref struct
*
**/
static void ibmvfc_release_tgt(struct kref *kref)
{
struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
kfree(tgt);
}
/**
* ibmvfc_get_starget_node_name - Get SCSI target's node name
* @starget: scsi target struct
*
* Return value:
* none
**/
static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
{
struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
if (tgt)
kref_put(&tgt->kref, ibmvfc_release_tgt);
}
/**
* ibmvfc_get_starget_port_name - Get SCSI target's port name
* @starget: scsi target struct
*
* Return value:
* none
**/
static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
{
struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
if (tgt)
kref_put(&tgt->kref, ibmvfc_release_tgt);
}
/**
* ibmvfc_get_starget_port_id - Get SCSI target's port ID
* @starget: scsi target struct
*
* Return value:
* none
**/
static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
{
struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
if (tgt)
kref_put(&tgt->kref, ibmvfc_release_tgt);
}
/**
* ibmvfc_wait_while_resetting - Wait while the host resets
* @vhost: ibmvfc host struct
*
* Return value:
* 0 on success / other on failure
**/
static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
{
long timeout = wait_event_timeout(vhost->init_wait_q,
((vhost->state == IBMVFC_ACTIVE ||
vhost->state == IBMVFC_HOST_OFFLINE ||
vhost->state == IBMVFC_LINK_DEAD) &&
vhost->action == IBMVFC_HOST_ACTION_NONE),
(init_timeout * HZ));
return timeout ? 0 : -EIO;
}
/**
* ibmvfc_issue_fc_host_lip - Re-initiate link initialization
* @shost: scsi host struct
*
* Return value:
* 0 on success / other on failure
**/
static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
{
struct ibmvfc_host *vhost = shost_priv(shost);
dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
ibmvfc_reset_host(vhost);
return ibmvfc_wait_while_resetting(vhost);
}
/**
* ibmvfc_gather_partition_info - Gather info about the LPAR
*
* Return value:
* none
**/
static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
{
struct device_node *rootdn;
const char *name;
const unsigned int *num;
rootdn = of_find_node_by_path("/");
if (!rootdn)
return;
name = of_get_property(rootdn, "ibm,partition-name", NULL);
if (name)
strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
num = of_get_property(rootdn, "ibm,partition-no", NULL);
if (num)
vhost->partition_number = *num;
of_node_put(rootdn);
}
/**
* ibmvfc_set_login_info - Setup info for NPIV login
* @vhost: ibmvfc host struct
*
* Return value:
* none
**/
static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
{
struct ibmvfc_npiv_login *login_info = &vhost->login_info;
struct device_node *of_node = vhost->dev->archdata.of_node;
const char *location;
memset(login_info, 0, sizeof(*login_info));
login_info->ostype = IBMVFC_OS_LINUX;
login_info->max_dma_len = IBMVFC_MAX_SECTORS << 9;
login_info->max_payload = sizeof(struct ibmvfc_fcp_cmd_iu);
login_info->max_response = sizeof(struct ibmvfc_fcp_rsp);
login_info->partition_num = vhost->partition_number;
login_info->vfc_frame_version = 1;
login_info->fcp_version = 3;
login_info->flags = IBMVFC_FLUSH_ON_HALT;
if (vhost->client_migrated)
login_info->flags |= IBMVFC_CLIENT_MIGRATED;
login_info->max_cmds = max_requests + IBMVFC_NUM_INTERNAL_REQ;
login_info->capabilities = IBMVFC_CAN_MIGRATE;
login_info->async.va = vhost->async_crq.msg_token;
login_info->async.len = vhost->async_crq.size * sizeof(*vhost->async_crq.msgs);
strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
strncpy(login_info->device_name,
dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
location = of_get_property(of_node, "ibm,loc-code", NULL);
location = location ? location : dev_name(vhost->dev);
strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
}
/**
* ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
* @vhost: ibmvfc host who owns the event pool
*
* Returns zero on success.
**/
static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
{
int i;
struct ibmvfc_event_pool *pool = &vhost->pool;
ENTER;
pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
if (!pool->events)
return -ENOMEM;
pool->iu_storage = dma_alloc_coherent(vhost->dev,
pool->size * sizeof(*pool->iu_storage),
&pool->iu_token, 0);
if (!pool->iu_storage) {
kfree(pool->events);
return -ENOMEM;
}
for (i = 0; i < pool->size; ++i) {
struct ibmvfc_event *evt = &pool->events[i];
atomic_set(&evt->free, 1);
evt->crq.valid = 0x80;
evt->crq.ioba = pool->iu_token + (sizeof(*evt->xfer_iu) * i);
evt->xfer_iu = pool->iu_storage + i;
evt->vhost = vhost;
evt->ext_list = NULL;
list_add_tail(&evt->queue, &vhost->free);
}
LEAVE;
return 0;
}
/**
* ibmvfc_free_event_pool - Frees memory of the event pool of a host
* @vhost: ibmvfc host who owns the event pool
*
**/
static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
{
int i;
struct ibmvfc_event_pool *pool = &vhost->pool;
ENTER;
for (i = 0; i < pool->size; ++i) {
list_del(&pool->events[i].queue);
BUG_ON(atomic_read(&pool->events[i].free) != 1);
if (pool->events[i].ext_list)
dma_pool_free(vhost->sg_pool,
pool->events[i].ext_list,
pool->events[i].ext_list_token);
}
kfree(pool->events);
dma_free_coherent(vhost->dev,
pool->size * sizeof(*pool->iu_storage),
pool->iu_storage, pool->iu_token);
LEAVE;
}
/**
* ibmvfc_get_event - Gets the next free event in pool
* @vhost: ibmvfc host struct
*
* Returns a free event from the pool.
**/
static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
{
struct ibmvfc_event *evt;
BUG_ON(list_empty(&vhost->free));
evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
atomic_set(&evt->free, 0);
list_del(&evt->queue);
return evt;
}
/**
* ibmvfc_init_event - Initialize fields in an event struct that are always
* required.
* @evt: The event
* @done: Routine to call when the event is responded to
* @format: SRP or MAD format
**/
static void ibmvfc_init_event(struct ibmvfc_event *evt,
void (*done) (struct ibmvfc_event *), u8 format)
{
evt->cmnd = NULL;
evt->sync_iu = NULL;
evt->crq.format = format;
evt->done = done;
evt->eh_comp = NULL;
}
/**
* ibmvfc_map_sg_list - Initialize scatterlist
* @scmd: scsi command struct
* @nseg: number of scatterlist segments
* @md: memory descriptor list to initialize
**/
static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
struct srp_direct_buf *md)
{
int i;
struct scatterlist *sg;
scsi_for_each_sg(scmd, sg, nseg, i) {
md[i].va = sg_dma_address(sg);
md[i].len = sg_dma_len(sg);
md[i].key = 0;
}
}
/**
* ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
* @scmd: Scsi_Cmnd with the scatterlist
* @evt: ibmvfc event struct
* @vfc_cmd: vfc_cmd that contains the memory descriptor
* @dev: device for which to map dma memory
*
* Returns:
* 0 on success / non-zero on failure
**/
static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
struct ibmvfc_event *evt,
struct ibmvfc_cmd *vfc_cmd, struct device *dev)
{
int sg_mapped;
struct srp_direct_buf *data = &vfc_cmd->ioba;
struct ibmvfc_host *vhost = dev_get_drvdata(dev);
sg_mapped = scsi_dma_map(scmd);
if (!sg_mapped) {
vfc_cmd->flags |= IBMVFC_NO_MEM_DESC;
return 0;
} else if (unlikely(sg_mapped < 0)) {
if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
return sg_mapped;
}
if (scmd->sc_data_direction == DMA_TO_DEVICE) {
vfc_cmd->flags |= IBMVFC_WRITE;
vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
} else {
vfc_cmd->flags |= IBMVFC_READ;
vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
}
if (sg_mapped == 1) {
ibmvfc_map_sg_list(scmd, sg_mapped, data);
return 0;
}
vfc_cmd->flags |= IBMVFC_SCATTERLIST;
if (!evt->ext_list) {
evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
&evt->ext_list_token);
if (!evt->ext_list) {
scsi_dma_unmap(scmd);
if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
return -ENOMEM;
}
}
ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
data->va = evt->ext_list_token;
data->len = sg_mapped * sizeof(struct srp_direct_buf);
data->key = 0;
return 0;
}
/**
* ibmvfc_timeout - Internal command timeout handler
* @evt: struct ibmvfc_event that timed out
*
* Called when an internally generated command times out
**/
static void ibmvfc_timeout(struct ibmvfc_event *evt)
{
struct ibmvfc_host *vhost = evt->vhost;
dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
ibmvfc_reset_host(vhost);
}
/**
* ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
* @evt: event to be sent
* @vhost: ibmvfc host struct
* @timeout: timeout in seconds - 0 means do not time command
*
* Returns the value returned from ibmvfc_send_crq(). (Zero for success)
**/
static int ibmvfc_send_event(struct ibmvfc_event *evt,
struct ibmvfc_host *vhost, unsigned long timeout)
{
u64 *crq_as_u64 = (u64 *) &evt->crq;
int rc;
/* Copy the IU into the transfer area */
*evt->xfer_iu = evt->iu;
if (evt->crq.format == IBMVFC_CMD_FORMAT)
evt->xfer_iu->cmd.tag = (u64)evt;
else if (evt->crq.format == IBMVFC_MAD_FORMAT)
evt->xfer_iu->mad_common.tag = (u64)evt;
else
BUG();
list_add_tail(&evt->queue, &vhost->sent);
init_timer(&evt->timer);
if (timeout) {
evt->timer.data = (unsigned long) evt;
evt->timer.expires = jiffies + (timeout * HZ);
evt->timer.function = (void (*)(unsigned long))ibmvfc_timeout;
add_timer(&evt->timer);
}
mb();
if ((rc = ibmvfc_send_crq(vhost, crq_as_u64[0], crq_as_u64[1]))) {
list_del(&evt->queue);
del_timer(&evt->timer);
/* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
* Firmware will send a CRQ with a transport event (0xFF) to
* tell this client what has happened to the transport. This
* will be handled in ibmvfc_handle_crq()
*/
if (rc == H_CLOSED) {
if (printk_ratelimit())
dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
if (evt->cmnd)
scsi_dma_unmap(evt->cmnd);
ibmvfc_free_event(evt);
return SCSI_MLQUEUE_HOST_BUSY;
}
dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
if (evt->cmnd) {
evt->cmnd->result = DID_ERROR << 16;
evt->done = ibmvfc_scsi_eh_done;
} else
evt->xfer_iu->mad_common.status = IBMVFC_MAD_CRQ_ERROR;
evt->done(evt);
} else
ibmvfc_trc_start(evt);
return 0;
}
/**
* ibmvfc_log_error - Log an error for the failed command if appropriate
* @evt: ibmvfc event to log
*
**/
static void ibmvfc_log_error(struct ibmvfc_event *evt)
{
struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
struct scsi_cmnd *cmnd = evt->cmnd;
const char *err = unknown_error;
int index = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
int logerr = 0;
int rsp_code = 0;
if (index >= 0) {
logerr = cmd_status[index].log;
err = cmd_status[index].name;
}
if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
return;
if (rsp->flags & FCP_RSP_LEN_VALID)
rsp_code = rsp->data.info.rsp_code;
scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) "
"flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error,
rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
}
/**
* ibmvfc_relogin - Log back into the specified device
* @sdev: scsi device struct
*
**/
static void ibmvfc_relogin(struct scsi_device *sdev)
{
struct ibmvfc_host *vhost = shost_priv(sdev->host);
struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
struct ibmvfc_target *tgt;
list_for_each_entry(tgt, &vhost->targets, queue) {
if (rport == tgt->rport) {
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
break;
}
}
ibmvfc_reinit_host(vhost);
}
/**
* ibmvfc_scsi_done - Handle responses from commands
* @evt: ibmvfc event to be handled
*
* Used as a callback when sending scsi cmds.
**/
static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
{
struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
struct scsi_cmnd *cmnd = evt->cmnd;
u32 rsp_len = 0;
u32 sense_len = rsp->fcp_sense_len;
if (cmnd) {
if (vfc_cmd->response_flags & IBMVFC_ADAPTER_RESID_VALID)
scsi_set_resid(cmnd, vfc_cmd->adapter_resid);
else if (rsp->flags & FCP_RESID_UNDER)
scsi_set_resid(cmnd, rsp->fcp_resid);
else
scsi_set_resid(cmnd, 0);
if (vfc_cmd->status) {
cmnd->result = ibmvfc_get_err_result(vfc_cmd);
if (rsp->flags & FCP_RSP_LEN_VALID)
rsp_len = rsp->fcp_rsp_len;
if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
if ((vfc_cmd->status & IBMVFC_VIOS_FAILURE) && (vfc_cmd->error == IBMVFC_PLOGI_REQUIRED))
ibmvfc_relogin(cmnd->device);
if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
cmnd->result = (DID_ERROR << 16);
ibmvfc_log_error(evt);
}
if (!cmnd->result &&
(scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
cmnd->result = (DID_ERROR << 16);
scsi_dma_unmap(cmnd);
cmnd->scsi_done(cmnd);
}
if (evt->eh_comp)
complete(evt->eh_comp);
ibmvfc_free_event(evt);
}
/**
* ibmvfc_host_chkready - Check if the host can accept commands
* @vhost: struct ibmvfc host
*
* Returns:
* 1 if host can accept command / 0 if not
**/
static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
{
int result = 0;
switch (vhost->state) {
case IBMVFC_LINK_DEAD:
case IBMVFC_HOST_OFFLINE:
result = DID_NO_CONNECT << 16;
break;
case IBMVFC_NO_CRQ:
case IBMVFC_INITIALIZING:
case IBMVFC_HALTED:
case IBMVFC_LINK_DOWN:
result = DID_REQUEUE << 16;
break;
case IBMVFC_ACTIVE:
result = 0;
break;
};
return result;
}
/**
* ibmvfc_queuecommand - The queuecommand function of the scsi template
* @cmnd: struct scsi_cmnd to be executed
* @done: Callback function to be called when cmnd is completed
*
* Returns:
* 0 on success / other on failure
**/
static int ibmvfc_queuecommand(struct scsi_cmnd *cmnd,
void (*done) (struct scsi_cmnd *))
{
struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
struct ibmvfc_cmd *vfc_cmd;
struct ibmvfc_event *evt;
u8 tag[2];
int rc;
if (unlikely((rc = fc_remote_port_chkready(rport))) ||
unlikely((rc = ibmvfc_host_chkready(vhost)))) {
cmnd->result = rc;
done(cmnd);
return 0;
}
cmnd->result = (DID_OK << 16);
evt = ibmvfc_get_event(vhost);
ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
evt->cmnd = cmnd;
cmnd->scsi_done = done;
vfc_cmd = &evt->iu.cmd;
memset(vfc_cmd, 0, sizeof(*vfc_cmd));
vfc_cmd->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
vfc_cmd->resp.len = sizeof(vfc_cmd->rsp);
vfc_cmd->frame_type = IBMVFC_SCSI_FCP_TYPE;
vfc_cmd->payload_len = sizeof(vfc_cmd->iu);
vfc_cmd->resp_len = sizeof(vfc_cmd->rsp);
vfc_cmd->cancel_key = (unsigned long)cmnd->device->hostdata;
vfc_cmd->tgt_scsi_id = rport->port_id;
vfc_cmd->iu.xfer_len = scsi_bufflen(cmnd);
int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
if (scsi_populate_tag_msg(cmnd, tag)) {
vfc_cmd->task_tag = tag[1];
switch (tag[0]) {
case MSG_SIMPLE_TAG:
vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
break;
case MSG_HEAD_TAG:
vfc_cmd->iu.pri_task_attr = IBMVFC_HEAD_OF_QUEUE;
break;
case MSG_ORDERED_TAG:
vfc_cmd->iu.pri_task_attr = IBMVFC_ORDERED_TASK;
break;
};
}
if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
return ibmvfc_send_event(evt, vhost, 0);
ibmvfc_free_event(evt);
if (rc == -ENOMEM)
return SCSI_MLQUEUE_HOST_BUSY;
if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
scmd_printk(KERN_ERR, cmnd,
"Failed to map DMA buffer for command. rc=%d\n", rc);
cmnd->result = DID_ERROR << 16;
done(cmnd);
return 0;
}
/**
* ibmvfc_sync_completion - Signal that a synchronous command has completed
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
{
/* copy the response back */
if (evt->sync_iu)
*evt->sync_iu = *evt->xfer_iu;
complete(&evt->comp);
}
/**
* ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
* @evt: struct ibmvfc_event
*
**/
static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
{
struct ibmvfc_host *vhost = evt->vhost;
ibmvfc_free_event(evt);
vhost->aborting_passthru = 0;
dev_info(vhost->dev, "Passthru command cancelled\n");
}
/**
* ibmvfc_bsg_timeout - Handle a BSG timeout
* @job: struct fc_bsg_job that timed out
*
* Returns:
* 0 on success / other on failure
**/
static int ibmvfc_bsg_timeout(struct fc_bsg_job *job)
{
struct ibmvfc_host *vhost = shost_priv(job->shost);
unsigned long port_id = (unsigned long)job->dd_data;
struct ibmvfc_event *evt;
struct ibmvfc_tmf *tmf;
unsigned long flags;
int rc;
ENTER;
spin_lock_irqsave(vhost->host->host_lock, flags);
if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
__ibmvfc_reset_host(vhost);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return 0;
}
vhost->aborting_passthru = 1;
evt = ibmvfc_get_event(vhost);
ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
tmf = &evt->iu.tmf;
memset(tmf, 0, sizeof(*tmf));
tmf->common.version = 1;
tmf->common.opcode = IBMVFC_TMF_MAD;
tmf->common.length = sizeof(*tmf);
tmf->scsi_id = port_id;
tmf->cancel_key = IBMVFC_PASSTHRU_CANCEL_KEY;
tmf->my_cancel_key = IBMVFC_INTERNAL_CANCEL_KEY;
rc = ibmvfc_send_event(evt, vhost, default_timeout);
if (rc != 0) {
vhost->aborting_passthru = 0;
dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
rc = -EIO;
} else
dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
port_id);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
LEAVE;
return rc;
}
/**
* ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
* @vhost: struct ibmvfc_host to send command
* @port_id: port ID to send command
*
* Returns:
* 0 on success / other on failure
**/
static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
{
struct ibmvfc_port_login *plogi;
struct ibmvfc_target *tgt;
struct ibmvfc_event *evt;
union ibmvfc_iu rsp_iu;
unsigned long flags;
int rc = 0, issue_login = 1;
ENTER;
spin_lock_irqsave(vhost->host->host_lock, flags);
list_for_each_entry(tgt, &vhost->targets, queue) {
if (tgt->scsi_id == port_id) {
issue_login = 0;
break;
}
}
if (!issue_login)
goto unlock_out;
if (unlikely((rc = ibmvfc_host_chkready(vhost))))
goto unlock_out;
evt = ibmvfc_get_event(vhost);
ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
plogi = &evt->iu.plogi;
memset(plogi, 0, sizeof(*plogi));
plogi->common.version = 1;
plogi->common.opcode = IBMVFC_PORT_LOGIN;
plogi->common.length = sizeof(*plogi);
plogi->scsi_id = port_id;
evt->sync_iu = &rsp_iu;
init_completion(&evt->comp);
rc = ibmvfc_send_event(evt, vhost, default_timeout);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
if (rc)
return -EIO;
wait_for_completion(&evt->comp);
if (rsp_iu.plogi.common.status)
rc = -EIO;
spin_lock_irqsave(vhost->host->host_lock, flags);
ibmvfc_free_event(evt);
unlock_out:
spin_unlock_irqrestore(vhost->host->host_lock, flags);
LEAVE;
return rc;
}
/**
* ibmvfc_bsg_request - Handle a BSG request
* @job: struct fc_bsg_job to be executed
*
* Returns:
* 0 on success / other on failure
**/
static int ibmvfc_bsg_request(struct fc_bsg_job *job)
{
struct ibmvfc_host *vhost = shost_priv(job->shost);
struct fc_rport *rport = job->rport;
struct ibmvfc_passthru_mad *mad;
struct ibmvfc_event *evt;
union ibmvfc_iu rsp_iu;
unsigned long flags, port_id = -1;
unsigned int code = job->request->msgcode;
int rc = 0, req_seg, rsp_seg, issue_login = 0;
u32 fc_flags, rsp_len;
ENTER;
job->reply->reply_payload_rcv_len = 0;
if (rport)
port_id = rport->port_id;
switch (code) {
case FC_BSG_HST_ELS_NOLOGIN:
port_id = (job->request->rqst_data.h_els.port_id[0] << 16) |
(job->request->rqst_data.h_els.port_id[1] << 8) |
job->request->rqst_data.h_els.port_id[2];
case FC_BSG_RPT_ELS:
fc_flags = IBMVFC_FC_ELS;
break;
case FC_BSG_HST_CT:
issue_login = 1;
port_id = (job->request->rqst_data.h_ct.port_id[0] << 16) |
(job->request->rqst_data.h_ct.port_id[1] << 8) |
job->request->rqst_data.h_ct.port_id[2];
case FC_BSG_RPT_CT:
fc_flags = IBMVFC_FC_CT_IU;
break;
default:
return -ENOTSUPP;
};
if (port_id == -1)
return -EINVAL;
if (!mutex_trylock(&vhost->passthru_mutex))
return -EBUSY;
job->dd_data = (void *)port_id;
req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
job->request_payload.sg_cnt, DMA_TO_DEVICE);
if (!req_seg) {
mutex_unlock(&vhost->passthru_mutex);
return -ENOMEM;
}
rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
if (!rsp_seg) {
dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
job->request_payload.sg_cnt, DMA_TO_DEVICE);
mutex_unlock(&vhost->passthru_mutex);
return -ENOMEM;
}
if (req_seg > 1 || rsp_seg > 1) {
rc = -EINVAL;
goto out;
}
if (issue_login)
rc = ibmvfc_bsg_plogi(vhost, port_id);
spin_lock_irqsave(vhost->host->host_lock, flags);
if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
unlikely((rc = ibmvfc_host_chkready(vhost)))) {
spin_unlock_irqrestore(vhost->host->host_lock, flags);
goto out;
}
evt = ibmvfc_get_event(vhost);
ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
mad = &evt->iu.passthru;
memset(mad, 0, sizeof(*mad));
mad->common.version = 1;
mad->common.opcode = IBMVFC_PASSTHRU;
mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu);
mad->cmd_ioba.va = (u64)evt->crq.ioba +
offsetof(struct ibmvfc_passthru_mad, iu);
mad->cmd_ioba.len = sizeof(mad->iu);
mad->iu.cmd_len = job->request_payload.payload_len;
mad->iu.rsp_len = job->reply_payload.payload_len;
mad->iu.flags = fc_flags;
mad->iu.cancel_key = IBMVFC_PASSTHRU_CANCEL_KEY;
mad->iu.cmd.va = sg_dma_address(job->request_payload.sg_list);
mad->iu.cmd.len = sg_dma_len(job->request_payload.sg_list);
mad->iu.rsp.va = sg_dma_address(job->reply_payload.sg_list);
mad->iu.rsp.len = sg_dma_len(job->reply_payload.sg_list);
mad->iu.scsi_id = port_id;
mad->iu.tag = (u64)evt;
rsp_len = mad->iu.rsp.len;
evt->sync_iu = &rsp_iu;
init_completion(&evt->comp);
rc = ibmvfc_send_event(evt, vhost, 0);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
if (rc) {
rc = -EIO;
goto out;
}
wait_for_completion(&evt->comp);
if (rsp_iu.passthru.common.status)
rc = -EIO;
else
job->reply->reply_payload_rcv_len = rsp_len;
spin_lock_irqsave(vhost->host->host_lock, flags);
ibmvfc_free_event(evt);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
job->reply->result = rc;
job->job_done(job);
rc = 0;
out:
dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
job->request_payload.sg_cnt, DMA_TO_DEVICE);
dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
mutex_unlock(&vhost->passthru_mutex);
LEAVE;
return rc;
}
/**
* ibmvfc_reset_device - Reset the device with the specified reset type
* @sdev: scsi device to reset
* @type: reset type
* @desc: reset type description for log messages
*
* Returns:
* 0 on success / other on failure
**/
static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
{
struct ibmvfc_host *vhost = shost_priv(sdev->host);
struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
struct ibmvfc_cmd *tmf;
struct ibmvfc_event *evt = NULL;
union ibmvfc_iu rsp_iu;
struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
int rsp_rc = -EBUSY;
unsigned long flags;
int rsp_code = 0;
spin_lock_irqsave(vhost->host->host_lock, flags);
if (vhost->state == IBMVFC_ACTIVE) {
evt = ibmvfc_get_event(vhost);
ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
tmf = &evt->iu.cmd;
memset(tmf, 0, sizeof(*tmf));
tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
tmf->resp.len = sizeof(tmf->rsp);
tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
tmf->payload_len = sizeof(tmf->iu);
tmf->resp_len = sizeof(tmf->rsp);
tmf->cancel_key = (unsigned long)sdev->hostdata;
tmf->tgt_scsi_id = rport->port_id;
int_to_scsilun(sdev->lun, &tmf->iu.lun);
tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
tmf->iu.tmf_flags = type;
evt->sync_iu = &rsp_iu;
init_completion(&evt->comp);
rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
}
spin_unlock_irqrestore(vhost->host->host_lock, flags);
if (rsp_rc != 0) {
sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
desc, rsp_rc);
return -EIO;
}
sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
wait_for_completion(&evt->comp);
if (rsp_iu.cmd.status)
rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
if (rsp_code) {
if (fc_rsp->flags & FCP_RSP_LEN_VALID)
rsp_code = fc_rsp->data.info.rsp_code;
sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
"flags: %x fcp_rsp: %x, scsi_status: %x\n",
desc, ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
fc_rsp->scsi_status);
rsp_rc = -EIO;
} else
sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
spin_lock_irqsave(vhost->host->host_lock, flags);
ibmvfc_free_event(evt);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return rsp_rc;
}
/**
* ibmvfc_abort_task_set - Abort outstanding commands to the device
* @sdev: scsi device to abort commands
*
* This sends an Abort Task Set to the VIOS for the specified device. This does
* NOT send any cancel to the VIOS. That must be done separately.
*
* Returns:
* 0 on success / other on failure
**/
static int ibmvfc_abort_task_set(struct scsi_device *sdev)
{
struct ibmvfc_host *vhost = shost_priv(sdev->host);
struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
struct ibmvfc_cmd *tmf;
struct ibmvfc_event *evt, *found_evt;
union ibmvfc_iu rsp_iu;
struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
int rsp_rc = -EBUSY;
unsigned long flags;
int rsp_code = 0;
spin_lock_irqsave(vhost->host->host_lock, flags);
found_evt = NULL;
list_for_each_entry(evt, &vhost->sent, queue) {
if (evt->cmnd && evt->cmnd->device == sdev) {
found_evt = evt;
break;
}
}
if (!found_evt) {
if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return 0;
}
if (vhost->state == IBMVFC_ACTIVE) {
evt = ibmvfc_get_event(vhost);
ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
tmf = &evt->iu.cmd;
memset(tmf, 0, sizeof(*tmf));
tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
tmf->resp.len = sizeof(tmf->rsp);
tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
tmf->payload_len = sizeof(tmf->iu);
tmf->resp_len = sizeof(tmf->rsp);
tmf->cancel_key = (unsigned long)sdev->hostdata;
tmf->tgt_scsi_id = rport->port_id;
int_to_scsilun(sdev->lun, &tmf->iu.lun);
tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
evt->sync_iu = &rsp_iu;
init_completion(&evt->comp);
rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
}
spin_unlock_irqrestore(vhost->host->host_lock, flags);
if (rsp_rc != 0) {
sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
return -EIO;
}
sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
wait_for_completion(&evt->comp);
if (rsp_iu.cmd.status)
rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
if (rsp_code) {
if (fc_rsp->flags & FCP_RSP_LEN_VALID)
rsp_code = fc_rsp->data.info.rsp_code;
sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
"flags: %x fcp_rsp: %x, scsi_status: %x\n",
ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
fc_rsp->scsi_status);
rsp_rc = -EIO;
} else
sdev_printk(KERN_INFO, sdev, "Abort successful\n");
spin_lock_irqsave(vhost->host->host_lock, flags);
ibmvfc_free_event(evt);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return rsp_rc;
}
/**
* ibmvfc_cancel_all - Cancel all outstanding commands to the device
* @sdev: scsi device to cancel commands
* @type: type of error recovery being performed
*
* This sends a cancel to the VIOS for the specified device. This does
* NOT send any abort to the actual device. That must be done separately.
*
* Returns:
* 0 on success / other on failure
**/
static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
{
struct ibmvfc_host *vhost = shost_priv(sdev->host);
struct scsi_target *starget = scsi_target(sdev);
struct fc_rport *rport = starget_to_rport(starget);
struct ibmvfc_tmf *tmf;
struct ibmvfc_event *evt, *found_evt;
union ibmvfc_iu rsp;
int rsp_rc = -EBUSY;
unsigned long flags;
u16 status;
ENTER;
spin_lock_irqsave(vhost->host->host_lock, flags);
found_evt = NULL;
list_for_each_entry(evt, &vhost->sent, queue) {
if (evt->cmnd && evt->cmnd->device == sdev) {
found_evt = evt;
break;
}
}
if (!found_evt) {
if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return 0;
}
if (vhost->state == IBMVFC_ACTIVE) {
evt = ibmvfc_get_event(vhost);
ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
tmf = &evt->iu.tmf;
memset(tmf, 0, sizeof(*tmf));
tmf->common.version = 1;
tmf->common.opcode = IBMVFC_TMF_MAD;
tmf->common.length = sizeof(*tmf);
tmf->scsi_id = rport->port_id;
int_to_scsilun(sdev->lun, &tmf->lun);
tmf->flags = (type | IBMVFC_TMF_LUA_VALID);
tmf->cancel_key = (unsigned long)sdev->hostdata;
tmf->my_cancel_key = (unsigned long)starget->hostdata;
evt->sync_iu = &rsp;
init_completion(&evt->comp);
rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
}
spin_unlock_irqrestore(vhost->host->host_lock, flags);
if (rsp_rc != 0) {
sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
return -EIO;
}
sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
wait_for_completion(&evt->comp);
status = rsp.mad_common.status;
spin_lock_irqsave(vhost->host->host_lock, flags);
ibmvfc_free_event(evt);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
if (status != IBMVFC_MAD_SUCCESS) {
sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
return -EIO;
}
sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
return 0;
}
/**
* ibmvfc_match_target - Match function for specified target
* @evt: ibmvfc event struct
* @device: device to match (starget)
*
* Returns:
* 1 if event matches starget / 0 if event does not match starget
**/
static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
{
if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
return 1;
return 0;
}
/**
* ibmvfc_match_lun - Match function for specified LUN
* @evt: ibmvfc event struct
* @device: device to match (sdev)
*
* Returns:
* 1 if event matches sdev / 0 if event does not match sdev
**/
static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
{
if (evt->cmnd && evt->cmnd->device == device)
return 1;
return 0;
}
/**
* ibmvfc_wait_for_ops - Wait for ops to complete
* @vhost: ibmvfc host struct
* @device: device to match (starget or sdev)
* @match: match function
*
* Returns:
* SUCCESS / FAILED
**/
static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
int (*match) (struct ibmvfc_event *, void *))
{
struct ibmvfc_event *evt;
DECLARE_COMPLETION_ONSTACK(comp);
int wait;
unsigned long flags;
signed long timeout = init_timeout * HZ;
ENTER;
do {
wait = 0;
spin_lock_irqsave(vhost->host->host_lock, flags);
list_for_each_entry(evt, &vhost->sent, queue) {
if (match(evt, device)) {
evt->eh_comp = &comp;
wait++;
}
}
spin_unlock_irqrestore(vhost->host->host_lock, flags);
if (wait) {
timeout = wait_for_completion_timeout(&comp, timeout);
if (!timeout) {
wait = 0;
spin_lock_irqsave(vhost->host->host_lock, flags);
list_for_each_entry(evt, &vhost->sent, queue) {
if (match(evt, device)) {
evt->eh_comp = NULL;
wait++;
}
}
spin_unlock_irqrestore(vhost->host->host_lock, flags);
if (wait)
dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
LEAVE;
return wait ? FAILED : SUCCESS;
}
}
} while (wait);
LEAVE;
return SUCCESS;
}
/**
* ibmvfc_eh_abort_handler - Abort a command
* @cmd: scsi command to abort
*
* Returns:
* SUCCESS / FAILED
**/
static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
{
struct scsi_device *sdev = cmd->device;
struct ibmvfc_host *vhost = shost_priv(sdev->host);
int cancel_rc, abort_rc;
int rc = FAILED;
ENTER;
ibmvfc_wait_while_resetting(vhost);
cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
abort_rc = ibmvfc_abort_task_set(sdev);
if (!cancel_rc && !abort_rc)
rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
LEAVE;
return rc;
}
/**
* ibmvfc_eh_device_reset_handler - Reset a single LUN
* @cmd: scsi command struct
*
* Returns:
* SUCCESS / FAILED
**/
static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
{
struct scsi_device *sdev = cmd->device;
struct ibmvfc_host *vhost = shost_priv(sdev->host);
int cancel_rc, reset_rc;
int rc = FAILED;
ENTER;
ibmvfc_wait_while_resetting(vhost);
cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
if (!cancel_rc && !reset_rc)
rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
LEAVE;
return rc;
}
/**
* ibmvfc_dev_cancel_all_abts - Device iterated cancel all function
* @sdev: scsi device struct
* @data: return code
*
**/
static void ibmvfc_dev_cancel_all_abts(struct scsi_device *sdev, void *data)
{
unsigned long *rc = data;
*rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
}
/**
* ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
* @sdev: scsi device struct
* @data: return code
*
**/
static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
{
unsigned long *rc = data;
*rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
}
/**
* ibmvfc_dev_abort_all - Device iterated abort task set function
* @sdev: scsi device struct
* @data: return code
*
**/
static void ibmvfc_dev_abort_all(struct scsi_device *sdev, void *data)
{
unsigned long *rc = data;
*rc |= ibmvfc_abort_task_set(sdev);
}
/**
* ibmvfc_eh_target_reset_handler - Reset the target
* @cmd: scsi command struct
*
* Returns:
* SUCCESS / FAILED
**/
static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
{
struct scsi_device *sdev = cmd->device;
struct ibmvfc_host *vhost = shost_priv(sdev->host);
struct scsi_target *starget = scsi_target(sdev);
int reset_rc;
int rc = FAILED;
unsigned long cancel_rc = 0;
ENTER;
ibmvfc_wait_while_resetting(vhost);
starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
if (!cancel_rc && !reset_rc)
rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
LEAVE;
return rc;
}
/**
* ibmvfc_eh_host_reset_handler - Reset the connection to the server
* @cmd: struct scsi_cmnd having problems
*
**/
static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
{
int rc;
struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
dev_err(vhost->dev, "Resetting connection due to error recovery\n");
rc = ibmvfc_issue_fc_host_lip(vhost->host);
return rc ? FAILED : SUCCESS;
}
/**
* ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
* @rport: rport struct
*
* Return value:
* none
**/
static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
{
struct scsi_target *starget = to_scsi_target(&rport->dev);
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ibmvfc_host *vhost = shost_priv(shost);
unsigned long cancel_rc = 0;
unsigned long abort_rc = 0;
int rc = FAILED;
ENTER;
starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_abts);
starget_for_each_device(starget, &abort_rc, ibmvfc_dev_abort_all);
if (!cancel_rc && !abort_rc)
rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
if (rc == FAILED)
ibmvfc_issue_fc_host_lip(shost);
LEAVE;
}
static const struct {
enum ibmvfc_async_event ae;
const char *desc;
} ae_desc [] = {
{ IBMVFC_AE_ELS_PLOGI, "PLOGI" },
{ IBMVFC_AE_ELS_LOGO, "LOGO" },
{ IBMVFC_AE_ELS_PRLO, "PRLO" },
{ IBMVFC_AE_SCN_NPORT, "N-Port SCN" },
{ IBMVFC_AE_SCN_GROUP, "Group SCN" },
{ IBMVFC_AE_SCN_DOMAIN, "Domain SCN" },
{ IBMVFC_AE_SCN_FABRIC, "Fabric SCN" },
{ IBMVFC_AE_LINK_UP, "Link Up" },
{ IBMVFC_AE_LINK_DOWN, "Link Down" },
{ IBMVFC_AE_LINK_DEAD, "Link Dead" },
{ IBMVFC_AE_HALT, "Halt" },
{ IBMVFC_AE_RESUME, "Resume" },
{ IBMVFC_AE_ADAPTER_FAILED, "Adapter Failed" },
};
static const char *unknown_ae = "Unknown async";
/**
* ibmvfc_get_ae_desc - Get text description for async event
* @ae: async event
*
**/
static const char *ibmvfc_get_ae_desc(u64 ae)
{
int i;
for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
if (ae_desc[i].ae == ae)
return ae_desc[i].desc;
return unknown_ae;
}
/**
* ibmvfc_handle_async - Handle an async event from the adapter
* @crq: crq to process
* @vhost: ibmvfc host struct
*
**/
static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
struct ibmvfc_host *vhost)
{
const char *desc = ibmvfc_get_ae_desc(crq->event);
struct ibmvfc_target *tgt;
ibmvfc_log(vhost, 3, "%s event received. scsi_id: %llx, wwpn: %llx,"
" node_name: %llx\n", desc, crq->scsi_id, crq->wwpn, crq->node_name);
switch (crq->event) {
case IBMVFC_AE_RESUME:
switch (crq->link_state) {
case IBMVFC_AE_LS_LINK_DOWN:
ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
break;
case IBMVFC_AE_LS_LINK_DEAD:
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
break;
case IBMVFC_AE_LS_LINK_UP:
case IBMVFC_AE_LS_LINK_BOUNCED:
default:
vhost->events_to_log |= IBMVFC_AE_LINKUP;
vhost->delay_init = 1;
__ibmvfc_reset_host(vhost);
break;
};
break;
case IBMVFC_AE_LINK_UP:
vhost->events_to_log |= IBMVFC_AE_LINKUP;
vhost->delay_init = 1;
__ibmvfc_reset_host(vhost);
break;
case IBMVFC_AE_SCN_FABRIC:
case IBMVFC_AE_SCN_DOMAIN:
vhost->events_to_log |= IBMVFC_AE_RSCN;
vhost->delay_init = 1;
__ibmvfc_reset_host(vhost);
break;
case IBMVFC_AE_SCN_NPORT:
case IBMVFC_AE_SCN_GROUP:
vhost->events_to_log |= IBMVFC_AE_RSCN;
ibmvfc_reinit_host(vhost);
break;
case IBMVFC_AE_ELS_LOGO:
case IBMVFC_AE_ELS_PRLO:
case IBMVFC_AE_ELS_PLOGI:
list_for_each_entry(tgt, &vhost->targets, queue) {
if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
break;
if (crq->scsi_id && tgt->scsi_id != crq->scsi_id)
continue;
if (crq->wwpn && tgt->ids.port_name != crq->wwpn)
continue;
if (crq->node_name && tgt->ids.node_name != crq->node_name)
continue;
if (tgt->need_login && crq->event == IBMVFC_AE_ELS_LOGO)
tgt->logo_rcvd = 1;
if (!tgt->need_login || crq->event == IBMVFC_AE_ELS_PLOGI) {
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
ibmvfc_reinit_host(vhost);
}
}
break;
case IBMVFC_AE_LINK_DOWN:
case IBMVFC_AE_ADAPTER_FAILED:
ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
break;
case IBMVFC_AE_LINK_DEAD:
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
break;
case IBMVFC_AE_HALT:
ibmvfc_link_down(vhost, IBMVFC_HALTED);
break;
default:
dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
break;
};
}
/**
* ibmvfc_handle_crq - Handles and frees received events in the CRQ
* @crq: Command/Response queue
* @vhost: ibmvfc host struct
*
**/
static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
{
long rc;
struct ibmvfc_event *evt = (struct ibmvfc_event *)crq->ioba;
switch (crq->valid) {
case IBMVFC_CRQ_INIT_RSP:
switch (crq->format) {
case IBMVFC_CRQ_INIT:
dev_info(vhost->dev, "Partner initialized\n");
/* Send back a response */
rc = ibmvfc_send_crq_init_complete(vhost);
if (rc == 0)
ibmvfc_init_host(vhost);
else
dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
break;
case IBMVFC_CRQ_INIT_COMPLETE:
dev_info(vhost->dev, "Partner initialization complete\n");
ibmvfc_init_host(vhost);
break;
default:
dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
}
return;
case IBMVFC_CRQ_XPORT_EVENT:
vhost->state = IBMVFC_NO_CRQ;
vhost->logged_in = 0;
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
if (crq->format == IBMVFC_PARTITION_MIGRATED) {
/* We need to re-setup the interpartition connection */
dev_info(vhost->dev, "Re-enabling adapter\n");
vhost->client_migrated = 1;
ibmvfc_purge_requests(vhost, DID_REQUEUE);
if ((rc = ibmvfc_reenable_crq_queue(vhost)) ||
(rc = ibmvfc_send_crq_init(vhost))) {
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
dev_err(vhost->dev, "Error after enable (rc=%ld)\n", rc);
} else
ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
} else {
dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
ibmvfc_purge_requests(vhost, DID_ERROR);
if ((rc = ibmvfc_reset_crq(vhost)) ||
(rc = ibmvfc_send_crq_init(vhost))) {
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
dev_err(vhost->dev, "Error after reset (rc=%ld)\n", rc);
} else
ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
}
return;
case IBMVFC_CRQ_CMD_RSP:
break;
default:
dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
return;
}
if (crq->format == IBMVFC_ASYNC_EVENT)
return;
/* The only kind of payload CRQs we should get are responses to
* things we send. Make sure this response is to something we
* actually sent
*/
if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
crq->ioba);
return;
}
if (unlikely(atomic_read(&evt->free))) {
dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
crq->ioba);
return;
}
del_timer(&evt->timer);
list_del(&evt->queue);
ibmvfc_trc_end(evt);
evt->done(evt);
}
/**
* ibmvfc_scan_finished - Check if the device scan is done.
* @shost: scsi host struct
* @time: current elapsed time
*
* Returns:
* 0 if scan is not done / 1 if scan is done
**/
static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
{
unsigned long flags;
struct ibmvfc_host *vhost = shost_priv(shost);
int done = 0;
spin_lock_irqsave(shost->host_lock, flags);
if (time >= (init_timeout * HZ)) {
dev_info(vhost->dev, "Scan taking longer than %d seconds, "
"continuing initialization\n", init_timeout);
done = 1;
}
if (vhost->scan_complete)
done = 1;
spin_unlock_irqrestore(shost->host_lock, flags);
return done;
}
/**
* ibmvfc_slave_alloc - Setup the device's task set value
* @sdev: struct scsi_device device to configure
*
* Set the device's task set value so that error handling works as
* expected.
*
* Returns:
* 0 on success / -ENXIO if device does not exist
**/
static int ibmvfc_slave_alloc(struct scsi_device *sdev)
{
struct Scsi_Host *shost = sdev->host;
struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
struct ibmvfc_host *vhost = shost_priv(shost);
unsigned long flags = 0;
if (!rport || fc_remote_port_chkready(rport))
return -ENXIO;
spin_lock_irqsave(shost->host_lock, flags);
sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
spin_unlock_irqrestore(shost->host_lock, flags);
return 0;
}
/**
* ibmvfc_target_alloc - Setup the target's task set value
* @starget: struct scsi_target
*
* Set the target's task set value so that error handling works as
* expected.
*
* Returns:
* 0 on success / -ENXIO if device does not exist
**/
static int ibmvfc_target_alloc(struct scsi_target *starget)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct ibmvfc_host *vhost = shost_priv(shost);
unsigned long flags = 0;
spin_lock_irqsave(shost->host_lock, flags);
starget->hostdata = (void *)(unsigned long)vhost->task_set++;
spin_unlock_irqrestore(shost->host_lock, flags);
return 0;
}
/**
* ibmvfc_slave_configure - Configure the device
* @sdev: struct scsi_device device to configure
*
* Enable allow_restart for a device if it is a disk. Adjust the
* queue_depth here also.
*
* Returns:
* 0
**/
static int ibmvfc_slave_configure(struct scsi_device *sdev)
{
struct Scsi_Host *shost = sdev->host;
struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
unsigned long flags = 0;
spin_lock_irqsave(shost->host_lock, flags);
if (sdev->type == TYPE_DISK)
sdev->allow_restart = 1;
if (sdev->tagged_supported) {
scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
scsi_activate_tcq(sdev, sdev->queue_depth);
} else
scsi_deactivate_tcq(sdev, sdev->queue_depth);
rport->dev_loss_tmo = dev_loss_tmo;
spin_unlock_irqrestore(shost->host_lock, flags);
return 0;
}
/**
* ibmvfc_change_queue_depth - Change the device's queue depth
* @sdev: scsi device struct
* @qdepth: depth to set
* @reason: calling context
*
* Return value:
* actual depth set
**/
static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth,
int reason)
{
if (reason != SCSI_QDEPTH_DEFAULT)
return -EOPNOTSUPP;
if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
qdepth = IBMVFC_MAX_CMDS_PER_LUN;
scsi_adjust_queue_depth(sdev, 0, qdepth);
return sdev->queue_depth;
}
/**
* ibmvfc_change_queue_type - Change the device's queue type
* @sdev: scsi device struct
* @tag_type: type of tags to use
*
* Return value:
* actual queue type set
**/
static int ibmvfc_change_queue_type(struct scsi_device *sdev, int tag_type)
{
if (sdev->tagged_supported) {
scsi_set_tag_type(sdev, tag_type);
if (tag_type)
scsi_activate_tcq(sdev, sdev->queue_depth);
else
scsi_deactivate_tcq(sdev, sdev->queue_depth);
} else
tag_type = 0;
return tag_type;
}
static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
return snprintf(buf, PAGE_SIZE, "%s\n",
vhost->login_buf->resp.partition_name);
}
static ssize_t ibmvfc_show_host_device_name(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
return snprintf(buf, PAGE_SIZE, "%s\n",
vhost->login_buf->resp.device_name);
}
static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
return snprintf(buf, PAGE_SIZE, "%s\n",
vhost->login_buf->resp.port_loc_code);
}
static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
return snprintf(buf, PAGE_SIZE, "%s\n",
vhost->login_buf->resp.drc_name);
}
static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
}
static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
}
/**
* ibmvfc_show_log_level - Show the adapter's error logging level
* @dev: class device struct
* @buf: buffer
*
* Return value:
* number of bytes printed to buffer
**/
static ssize_t ibmvfc_show_log_level(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
unsigned long flags = 0;
int len;
spin_lock_irqsave(shost->host_lock, flags);
len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
spin_unlock_irqrestore(shost->host_lock, flags);
return len;
}
/**
* ibmvfc_store_log_level - Change the adapter's error logging level
* @dev: class device struct
* @buf: buffer
*
* Return value:
* number of bytes printed to buffer
**/
static ssize_t ibmvfc_store_log_level(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
unsigned long flags = 0;
spin_lock_irqsave(shost->host_lock, flags);
vhost->log_level = simple_strtoul(buf, NULL, 10);
spin_unlock_irqrestore(shost->host_lock, flags);
return strlen(buf);
}
static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
ibmvfc_show_log_level, ibmvfc_store_log_level);
#ifdef CONFIG_SCSI_IBMVFC_TRACE
/**
* ibmvfc_read_trace - Dump the adapter trace
* @kobj: kobject struct
* @bin_attr: bin_attribute struct
* @buf: buffer
* @off: offset
* @count: buffer size
*
* Return value:
* number of bytes printed to buffer
**/
static ssize_t ibmvfc_read_trace(struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t count)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
unsigned long flags = 0;
int size = IBMVFC_TRACE_SIZE;
char *src = (char *)vhost->trace;
if (off > size)
return 0;
if (off + count > size) {
size -= off;
count = size;
}
spin_lock_irqsave(shost->host_lock, flags);
memcpy(buf, &src[off], count);
spin_unlock_irqrestore(shost->host_lock, flags);
return count;
}
static struct bin_attribute ibmvfc_trace_attr = {
.attr = {
.name = "trace",
.mode = S_IRUGO,
},
.size = 0,
.read = ibmvfc_read_trace,
};
#endif
static struct device_attribute *ibmvfc_attrs[] = {
&dev_attr_partition_name,
&dev_attr_device_name,
&dev_attr_port_loc_code,
&dev_attr_drc_name,
&dev_attr_npiv_version,
&dev_attr_capabilities,
&dev_attr_log_level,
NULL
};
static struct scsi_host_template driver_template = {
.module = THIS_MODULE,
.name = "IBM POWER Virtual FC Adapter",
.proc_name = IBMVFC_NAME,
.queuecommand = ibmvfc_queuecommand,
.eh_abort_handler = ibmvfc_eh_abort_handler,
.eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
.eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
.eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
.slave_alloc = ibmvfc_slave_alloc,
.slave_configure = ibmvfc_slave_configure,
.target_alloc = ibmvfc_target_alloc,
.scan_finished = ibmvfc_scan_finished,
.change_queue_depth = ibmvfc_change_queue_depth,
.change_queue_type = ibmvfc_change_queue_type,
.cmd_per_lun = 16,
.can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
.this_id = -1,
.sg_tablesize = SG_ALL,
.max_sectors = IBMVFC_MAX_SECTORS,
.use_clustering = ENABLE_CLUSTERING,
.shost_attrs = ibmvfc_attrs,
};
/**
* ibmvfc_next_async_crq - Returns the next entry in async queue
* @vhost: ibmvfc host struct
*
* Returns:
* Pointer to next entry in queue / NULL if empty
**/
static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
{
struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
struct ibmvfc_async_crq *crq;
crq = &async_crq->msgs[async_crq->cur];
if (crq->valid & 0x80) {
if (++async_crq->cur == async_crq->size)
async_crq->cur = 0;
} else
crq = NULL;
return crq;
}
/**
* ibmvfc_next_crq - Returns the next entry in message queue
* @vhost: ibmvfc host struct
*
* Returns:
* Pointer to next entry in queue / NULL if empty
**/
static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
{
struct ibmvfc_crq_queue *queue = &vhost->crq;
struct ibmvfc_crq *crq;
crq = &queue->msgs[queue->cur];
if (crq->valid & 0x80) {
if (++queue->cur == queue->size)
queue->cur = 0;
} else
crq = NULL;
return crq;
}
/**
* ibmvfc_interrupt - Interrupt handler
* @irq: number of irq to handle, not used
* @dev_instance: ibmvfc_host that received interrupt
*
* Returns:
* IRQ_HANDLED
**/
static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
{
struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
unsigned long flags;
spin_lock_irqsave(vhost->host->host_lock, flags);
vio_disable_interrupts(to_vio_dev(vhost->dev));
tasklet_schedule(&vhost->tasklet);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return IRQ_HANDLED;
}
/**
* ibmvfc_tasklet - Interrupt handler tasklet
* @data: ibmvfc host struct
*
* Returns:
* Nothing
**/
static void ibmvfc_tasklet(void *data)
{
struct ibmvfc_host *vhost = data;
struct vio_dev *vdev = to_vio_dev(vhost->dev);
struct ibmvfc_crq *crq;
struct ibmvfc_async_crq *async;
unsigned long flags;
int done = 0;
spin_lock_irqsave(vhost->host->host_lock, flags);
while (!done) {
/* Pull all the valid messages off the async CRQ */
while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
ibmvfc_handle_async(async, vhost);
async->valid = 0;
}
/* Pull all the valid messages off the CRQ */
while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
ibmvfc_handle_crq(crq, vhost);
crq->valid = 0;
}
vio_enable_interrupts(vdev);
if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
vio_disable_interrupts(vdev);
ibmvfc_handle_async(async, vhost);
async->valid = 0;
} else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
vio_disable_interrupts(vdev);
ibmvfc_handle_crq(crq, vhost);
crq->valid = 0;
} else
done = 1;
}
spin_unlock_irqrestore(vhost->host->host_lock, flags);
}
/**
* ibmvfc_init_tgt - Set the next init job step for the target
* @tgt: ibmvfc target struct
* @job_step: job step to perform
*
**/
static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
void (*job_step) (struct ibmvfc_target *))
{
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
tgt->job_step = job_step;
wake_up(&tgt->vhost->work_wait_q);
}
/**
* ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
* @tgt: ibmvfc target struct
* @job_step: initialization job step
*
* Returns: 1 if step will be retried / 0 if not
*
**/
static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
void (*job_step) (struct ibmvfc_target *))
{
if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
wake_up(&tgt->vhost->work_wait_q);
return 0;
} else
ibmvfc_init_tgt(tgt, job_step);
return 1;
}
/* Defined in FC-LS */
static const struct {
int code;
int retry;
int logged_in;
} prli_rsp [] = {
{ 0, 1, 0 },
{ 1, 0, 1 },
{ 2, 1, 0 },
{ 3, 1, 0 },
{ 4, 0, 0 },
{ 5, 0, 0 },
{ 6, 0, 1 },
{ 7, 0, 0 },
{ 8, 1, 0 },
};
/**
* ibmvfc_get_prli_rsp - Find PRLI response index
* @flags: PRLI response flags
*
**/
static int ibmvfc_get_prli_rsp(u16 flags)
{
int i;
int code = (flags & 0x0f00) >> 8;
for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
if (prli_rsp[i].code == code)
return i;
return 0;
}
/**
* ibmvfc_tgt_prli_done - Completion handler for Process Login
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
{
struct ibmvfc_target *tgt = evt->tgt;
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
u32 status = rsp->common.status;
int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
switch (status) {
case IBMVFC_MAD_SUCCESS:
tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
parms->type, parms->flags, parms->service_parms);
if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
index = ibmvfc_get_prli_rsp(parms->flags);
if (prli_rsp[index].logged_in) {
if (parms->flags & IBMVFC_PRLI_EST_IMG_PAIR) {
tgt->need_login = 0;
tgt->ids.roles = 0;
if (parms->service_parms & IBMVFC_PRLI_TARGET_FUNC)
tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
if (parms->service_parms & IBMVFC_PRLI_INITIATOR_FUNC)
tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
tgt->add_rport = 1;
} else
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
} else if (prli_rsp[index].retry)
ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
else
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
} else
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
break;
case IBMVFC_MAD_DRIVER_FAILED:
break;
case IBMVFC_MAD_CRQ_ERROR:
ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
break;
case IBMVFC_MAD_FAILED:
default:
if ((rsp->status & IBMVFC_VIOS_FAILURE) && rsp->error == IBMVFC_PLOGI_REQUIRED)
level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
else if (tgt->logo_rcvd)
level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
else
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
ibmvfc_get_cmd_error(rsp->status, rsp->error),
rsp->status, rsp->error, status);
break;
};
kref_put(&tgt->kref, ibmvfc_release_tgt);
ibmvfc_free_event(evt);
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_tgt_send_prli - Send a process login
* @tgt: ibmvfc target struct
*
**/
static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
{
struct ibmvfc_process_login *prli;
struct ibmvfc_host *vhost = tgt->vhost;
struct ibmvfc_event *evt;
if (vhost->discovery_threads >= disc_threads)
return;
kref_get(&tgt->kref);
evt = ibmvfc_get_event(vhost);
vhost->discovery_threads++;
ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
evt->tgt = tgt;
prli = &evt->iu.prli;
memset(prli, 0, sizeof(*prli));
prli->common.version = 1;
prli->common.opcode = IBMVFC_PROCESS_LOGIN;
prli->common.length = sizeof(*prli);
prli->scsi_id = tgt->scsi_id;
prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
prli->parms.flags = IBMVFC_PRLI_EST_IMG_PAIR;
prli->parms.service_parms = IBMVFC_PRLI_INITIATOR_FUNC;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
if (ibmvfc_send_event(evt, vhost, default_timeout)) {
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
kref_put(&tgt->kref, ibmvfc_release_tgt);
} else
tgt_dbg(tgt, "Sent process login\n");
}
/**
* ibmvfc_tgt_plogi_done - Completion handler for Port Login
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
{
struct ibmvfc_target *tgt = evt->tgt;
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
u32 status = rsp->common.status;
int level = IBMVFC_DEFAULT_LOG_LEVEL;
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
switch (status) {
case IBMVFC_MAD_SUCCESS:
tgt_dbg(tgt, "Port Login succeeded\n");
if (tgt->ids.port_name &&
tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
vhost->reinit = 1;
tgt_dbg(tgt, "Port re-init required\n");
break;
}
tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
tgt->ids.port_id = tgt->scsi_id;
memcpy(&tgt->service_parms, &rsp->service_parms,
sizeof(tgt->service_parms));
memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
sizeof(tgt->service_parms_change));
ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
break;
case IBMVFC_MAD_DRIVER_FAILED:
break;
case IBMVFC_MAD_CRQ_ERROR:
ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
break;
case IBMVFC_MAD_FAILED:
default:
if (ibmvfc_retry_cmd(rsp->status, rsp->error))
level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
else
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
ibmvfc_get_ls_explain(rsp->fc_explain), rsp->fc_explain, status);
break;
};
kref_put(&tgt->kref, ibmvfc_release_tgt);
ibmvfc_free_event(evt);
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
* @tgt: ibmvfc target struct
*
**/
static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
{
struct ibmvfc_port_login *plogi;
struct ibmvfc_host *vhost = tgt->vhost;
struct ibmvfc_event *evt;
if (vhost->discovery_threads >= disc_threads)
return;
kref_get(&tgt->kref);
tgt->logo_rcvd = 0;
evt = ibmvfc_get_event(vhost);
vhost->discovery_threads++;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
evt->tgt = tgt;
plogi = &evt->iu.plogi;
memset(plogi, 0, sizeof(*plogi));
plogi->common.version = 1;
plogi->common.opcode = IBMVFC_PORT_LOGIN;
plogi->common.length = sizeof(*plogi);
plogi->scsi_id = tgt->scsi_id;
if (ibmvfc_send_event(evt, vhost, default_timeout)) {
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
kref_put(&tgt->kref, ibmvfc_release_tgt);
} else
tgt_dbg(tgt, "Sent port login\n");
}
/**
* ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
{
struct ibmvfc_target *tgt = evt->tgt;
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
u32 status = rsp->common.status;
vhost->discovery_threads--;
ibmvfc_free_event(evt);
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
switch (status) {
case IBMVFC_MAD_SUCCESS:
tgt_dbg(tgt, "Implicit Logout succeeded\n");
break;
case IBMVFC_MAD_DRIVER_FAILED:
kref_put(&tgt->kref, ibmvfc_release_tgt);
wake_up(&vhost->work_wait_q);
return;
case IBMVFC_MAD_FAILED:
default:
tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
break;
};
if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
tgt->scsi_id != tgt->new_scsi_id)
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
kref_put(&tgt->kref, ibmvfc_release_tgt);
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
* @tgt: ibmvfc target struct
*
**/
static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
{
struct ibmvfc_implicit_logout *mad;
struct ibmvfc_host *vhost = tgt->vhost;
struct ibmvfc_event *evt;
if (vhost->discovery_threads >= disc_threads)
return;
kref_get(&tgt->kref);
evt = ibmvfc_get_event(vhost);
vhost->discovery_threads++;
ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
evt->tgt = tgt;
mad = &evt->iu.implicit_logout;
memset(mad, 0, sizeof(*mad));
mad->common.version = 1;
mad->common.opcode = IBMVFC_IMPLICIT_LOGOUT;
mad->common.length = sizeof(*mad);
mad->old_scsi_id = tgt->scsi_id;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
if (ibmvfc_send_event(evt, vhost, default_timeout)) {
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
kref_put(&tgt->kref, ibmvfc_release_tgt);
} else
tgt_dbg(tgt, "Sent Implicit Logout\n");
}
/**
* ibmvfc_adisc_needs_plogi - Does device need PLOGI?
* @mad: ibmvfc passthru mad struct
* @tgt: ibmvfc target struct
*
* Returns:
* 1 if PLOGI needed / 0 if PLOGI not needed
**/
static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
struct ibmvfc_target *tgt)
{
if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name,
sizeof(tgt->ids.port_name)))
return 1;
if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name,
sizeof(tgt->ids.node_name)))
return 1;
if (mad->fc_iu.response[6] != tgt->scsi_id)
return 1;
return 0;
}
/**
* ibmvfc_tgt_adisc_done - Completion handler for ADISC
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
{
struct ibmvfc_target *tgt = evt->tgt;
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
u32 status = mad->common.status;
u8 fc_reason, fc_explain;
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
del_timer(&tgt->timer);
switch (status) {
case IBMVFC_MAD_SUCCESS:
tgt_dbg(tgt, "ADISC succeeded\n");
if (ibmvfc_adisc_needs_plogi(mad, tgt))
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
break;
case IBMVFC_MAD_DRIVER_FAILED:
break;
case IBMVFC_MAD_FAILED:
default:
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
fc_reason = (mad->fc_iu.response[1] & 0x00ff0000) >> 16;
fc_explain = (mad->fc_iu.response[1] & 0x0000ff00) >> 8;
tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
ibmvfc_get_cmd_error(mad->iu.status, mad->iu.error),
mad->iu.status, mad->iu.error,
ibmvfc_get_fc_type(fc_reason), fc_reason,
ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
break;
};
kref_put(&tgt->kref, ibmvfc_release_tgt);
ibmvfc_free_event(evt);
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_init_passthru - Initialize an event struct for FC passthru
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
{
struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
memset(mad, 0, sizeof(*mad));
mad->common.version = 1;
mad->common.opcode = IBMVFC_PASSTHRU;
mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu);
mad->cmd_ioba.va = (u64)evt->crq.ioba +
offsetof(struct ibmvfc_passthru_mad, iu);
mad->cmd_ioba.len = sizeof(mad->iu);
mad->iu.cmd_len = sizeof(mad->fc_iu.payload);
mad->iu.rsp_len = sizeof(mad->fc_iu.response);
mad->iu.cmd.va = (u64)evt->crq.ioba +
offsetof(struct ibmvfc_passthru_mad, fc_iu) +
offsetof(struct ibmvfc_passthru_fc_iu, payload);
mad->iu.cmd.len = sizeof(mad->fc_iu.payload);
mad->iu.rsp.va = (u64)evt->crq.ioba +
offsetof(struct ibmvfc_passthru_mad, fc_iu) +
offsetof(struct ibmvfc_passthru_fc_iu, response);
mad->iu.rsp.len = sizeof(mad->fc_iu.response);
}
/**
* ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
* @evt: ibmvfc event struct
*
* Just cleanup this event struct. Everything else is handled by
* the ADISC completion handler. If the ADISC never actually comes
* back, we still have the timer running on the ADISC event struct
* which will fire and cause the CRQ to get reset.
*
**/
static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
{
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_target *tgt = evt->tgt;
tgt_dbg(tgt, "ADISC cancel complete\n");
vhost->abort_threads--;
ibmvfc_free_event(evt);
kref_put(&tgt->kref, ibmvfc_release_tgt);
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_adisc_timeout - Handle an ADISC timeout
* @tgt: ibmvfc target struct
*
* If an ADISC times out, send a cancel. If the cancel times
* out, reset the CRQ. When the ADISC comes back as cancelled,
* log back into the target.
**/
static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt)
{
struct ibmvfc_host *vhost = tgt->vhost;
struct ibmvfc_event *evt;
struct ibmvfc_tmf *tmf;
unsigned long flags;
int rc;
tgt_dbg(tgt, "ADISC timeout\n");
spin_lock_irqsave(vhost->host->host_lock, flags);
if (vhost->abort_threads >= disc_threads ||
tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
vhost->state != IBMVFC_INITIALIZING ||
vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return;
}
vhost->abort_threads++;
kref_get(&tgt->kref);
evt = ibmvfc_get_event(vhost);
ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
evt->tgt = tgt;
tmf = &evt->iu.tmf;
memset(tmf, 0, sizeof(*tmf));
tmf->common.version = 1;
tmf->common.opcode = IBMVFC_TMF_MAD;
tmf->common.length = sizeof(*tmf);
tmf->scsi_id = tgt->scsi_id;
tmf->cancel_key = tgt->cancel_key;
rc = ibmvfc_send_event(evt, vhost, default_timeout);
if (rc) {
tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
vhost->abort_threads--;
kref_put(&tgt->kref, ibmvfc_release_tgt);
__ibmvfc_reset_host(vhost);
} else
tgt_dbg(tgt, "Attempting to cancel ADISC\n");
spin_unlock_irqrestore(vhost->host->host_lock, flags);
}
/**
* ibmvfc_tgt_adisc - Initiate an ADISC for specified target
* @tgt: ibmvfc target struct
*
* When sending an ADISC we end up with two timers running. The
* first timer is the timer in the ibmvfc target struct. If this
* fires, we send a cancel to the target. The second timer is the
* timer on the ibmvfc event for the ADISC, which is longer. If that
* fires, it means the ADISC timed out and our attempt to cancel it
* also failed, so we need to reset the CRQ.
**/
static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
{
struct ibmvfc_passthru_mad *mad;
struct ibmvfc_host *vhost = tgt->vhost;
struct ibmvfc_event *evt;
if (vhost->discovery_threads >= disc_threads)
return;
kref_get(&tgt->kref);
evt = ibmvfc_get_event(vhost);
vhost->discovery_threads++;
ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
evt->tgt = tgt;
ibmvfc_init_passthru(evt);
mad = &evt->iu.passthru;
mad->iu.flags = IBMVFC_FC_ELS;
mad->iu.scsi_id = tgt->scsi_id;
mad->iu.cancel_key = tgt->cancel_key;
mad->fc_iu.payload[0] = IBMVFC_ADISC;
memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
sizeof(vhost->login_buf->resp.port_name));
memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
sizeof(vhost->login_buf->resp.node_name));
mad->fc_iu.payload[6] = vhost->login_buf->resp.scsi_id & 0x00ffffff;
if (timer_pending(&tgt->timer))
mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
else {
tgt->timer.data = (unsigned long) tgt;
tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout;
add_timer(&tgt->timer);
}
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
vhost->discovery_threads--;
del_timer(&tgt->timer);
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
kref_put(&tgt->kref, ibmvfc_release_tgt);
} else
tgt_dbg(tgt, "Sent ADISC\n");
}
/**
* ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
{
struct ibmvfc_target *tgt = evt->tgt;
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
u32 status = rsp->common.status;
int level = IBMVFC_DEFAULT_LOG_LEVEL;
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
switch (status) {
case IBMVFC_MAD_SUCCESS:
tgt_dbg(tgt, "Query Target succeeded\n");
tgt->new_scsi_id = rsp->scsi_id;
if (rsp->scsi_id != tgt->scsi_id)
ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
else
ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
break;
case IBMVFC_MAD_DRIVER_FAILED:
break;
case IBMVFC_MAD_CRQ_ERROR:
ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
break;
case IBMVFC_MAD_FAILED:
default:
if ((rsp->status & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
rsp->error == IBMVFC_UNABLE_TO_PERFORM_REQ &&
rsp->fc_explain == IBMVFC_PORT_NAME_NOT_REG)
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
else
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
ibmvfc_get_gs_explain(rsp->fc_explain), rsp->fc_explain, status);
break;
};
kref_put(&tgt->kref, ibmvfc_release_tgt);
ibmvfc_free_event(evt);
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_tgt_query_target - Initiate a Query Target for specified target
* @tgt: ibmvfc target struct
*
**/
static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
{
struct ibmvfc_query_tgt *query_tgt;
struct ibmvfc_host *vhost = tgt->vhost;
struct ibmvfc_event *evt;
if (vhost->discovery_threads >= disc_threads)
return;
kref_get(&tgt->kref);
evt = ibmvfc_get_event(vhost);
vhost->discovery_threads++;
evt->tgt = tgt;
ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
query_tgt = &evt->iu.query_tgt;
memset(query_tgt, 0, sizeof(*query_tgt));
query_tgt->common.version = 1;
query_tgt->common.opcode = IBMVFC_QUERY_TARGET;
query_tgt->common.length = sizeof(*query_tgt);
query_tgt->wwpn = tgt->ids.port_name;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
if (ibmvfc_send_event(evt, vhost, default_timeout)) {
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
kref_put(&tgt->kref, ibmvfc_release_tgt);
} else
tgt_dbg(tgt, "Sent Query Target\n");
}
/**
* ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
* @vhost: ibmvfc host struct
* @scsi_id: SCSI ID to allocate target for
*
* Returns:
* 0 on success / other on failure
**/
static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
{
struct ibmvfc_target *tgt;
unsigned long flags;
spin_lock_irqsave(vhost->host->host_lock, flags);
list_for_each_entry(tgt, &vhost->targets, queue) {
if (tgt->scsi_id == scsi_id) {
if (tgt->need_login)
ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
goto unlock_out;
}
}
spin_unlock_irqrestore(vhost->host->host_lock, flags);
tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
if (!tgt) {
dev_err(vhost->dev, "Target allocation failure for scsi id %08llx\n",
scsi_id);
return -ENOMEM;
}
memset(tgt, 0, sizeof(*tgt));
tgt->scsi_id = scsi_id;
tgt->new_scsi_id = scsi_id;
tgt->vhost = vhost;
tgt->need_login = 1;
tgt->cancel_key = vhost->task_set++;
init_timer(&tgt->timer);
kref_init(&tgt->kref);
ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
spin_lock_irqsave(vhost->host->host_lock, flags);
list_add_tail(&tgt->queue, &vhost->targets);
unlock_out:
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return 0;
}
/**
* ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
* @vhost: ibmvfc host struct
*
* Returns:
* 0 on success / other on failure
**/
static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
{
int i, rc;
for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
rc = ibmvfc_alloc_target(vhost,
vhost->disc_buf->scsi_id[i] & IBMVFC_DISC_TGT_SCSI_ID_MASK);
return rc;
}
/**
* ibmvfc_discover_targets_done - Completion handler for discover targets MAD
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
{
struct ibmvfc_host *vhost = evt->vhost;
struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
u32 mad_status = rsp->common.status;
int level = IBMVFC_DEFAULT_LOG_LEVEL;
switch (mad_status) {
case IBMVFC_MAD_SUCCESS:
ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
vhost->num_targets = rsp->num_written;
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
break;
case IBMVFC_MAD_FAILED:
level += ibmvfc_retry_host_init(vhost);
ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
break;
case IBMVFC_MAD_DRIVER_FAILED:
break;
default:
dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
break;
}
ibmvfc_free_event(evt);
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_discover_targets - Send Discover Targets MAD
* @vhost: ibmvfc host struct
*
**/
static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
{
struct ibmvfc_discover_targets *mad;
struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
mad = &evt->iu.discover_targets;
memset(mad, 0, sizeof(*mad));
mad->common.version = 1;
mad->common.opcode = IBMVFC_DISC_TARGETS;
mad->common.length = sizeof(*mad);
mad->bufflen = vhost->disc_buf_sz;
mad->buffer.va = vhost->disc_buf_dma;
mad->buffer.len = vhost->disc_buf_sz;
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
if (!ibmvfc_send_event(evt, vhost, default_timeout))
ibmvfc_dbg(vhost, "Sent discover targets\n");
else
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
}
/**
* ibmvfc_npiv_login_done - Completion handler for NPIV Login
* @evt: ibmvfc event struct
*
**/
static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
{
struct ibmvfc_host *vhost = evt->vhost;
u32 mad_status = evt->xfer_iu->npiv_login.common.status;
struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
unsigned int npiv_max_sectors;
int level = IBMVFC_DEFAULT_LOG_LEVEL;
switch (mad_status) {
case IBMVFC_MAD_SUCCESS:
ibmvfc_free_event(evt);
break;
case IBMVFC_MAD_FAILED:
if (ibmvfc_retry_cmd(rsp->status, rsp->error))
level += ibmvfc_retry_host_init(vhost);
else
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
ibmvfc_free_event(evt);
return;
case IBMVFC_MAD_CRQ_ERROR:
ibmvfc_retry_host_init(vhost);
case IBMVFC_MAD_DRIVER_FAILED:
ibmvfc_free_event(evt);
return;
default:
dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
ibmvfc_free_event(evt);
return;
}
vhost->client_migrated = 0;
if (!(rsp->flags & IBMVFC_NATIVE_FC)) {
dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
rsp->flags);
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
wake_up(&vhost->work_wait_q);
return;
}
if (rsp->max_cmds <= IBMVFC_NUM_INTERNAL_REQ) {
dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
rsp->max_cmds);
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
wake_up(&vhost->work_wait_q);
return;
}
vhost->logged_in = 1;
npiv_max_sectors = min((uint)(rsp->max_dma_len >> 9), IBMVFC_MAX_SECTORS);
dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
rsp->partition_name, rsp->device_name, rsp->port_loc_code,
rsp->drc_name, npiv_max_sectors);
fc_host_fabric_name(vhost->host) = rsp->node_name;
fc_host_node_name(vhost->host) = rsp->node_name;
fc_host_port_name(vhost->host) = rsp->port_name;
fc_host_port_id(vhost->host) = rsp->scsi_id;
fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
fc_host_supported_classes(vhost->host) = 0;
if (rsp->service_parms.class1_parms[0] & 0x80000000)
fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
if (rsp->service_parms.class2_parms[0] & 0x80000000)
fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
if (rsp->service_parms.class3_parms[0] & 0x80000000)
fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
fc_host_maxframe_size(vhost->host) =
rsp->service_parms.common.bb_rcv_sz & 0x0fff;
vhost->host->can_queue = rsp->max_cmds - IBMVFC_NUM_INTERNAL_REQ;
vhost->host->max_sectors = npiv_max_sectors;
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
wake_up(&vhost->work_wait_q);
}
/**
* ibmvfc_npiv_login - Sends NPIV login
* @vhost: ibmvfc host struct
*
**/
static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
{
struct ibmvfc_npiv_login_mad *mad;
struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
ibmvfc_gather_partition_info(vhost);
ibmvfc_set_login_info(vhost);
ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
mad = &evt->iu.npiv_login;
memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
mad->common.version = 1;
mad->common.opcode = IBMVFC_NPIV_LOGIN;
mad->common.length = sizeof(struct ibmvfc_npiv_login_mad);
mad->buffer.va = vhost->login_buf_dma;
mad->buffer.len = sizeof(*vhost->login_buf);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
if (!ibmvfc_send_event(evt, vhost, default_timeout))
ibmvfc_dbg(vhost, "Sent NPIV login\n");
else
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
};
/**
* ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
* @vhost: ibmvfc host struct
*
**/
static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
{
struct ibmvfc_host *vhost = evt->vhost;
u32 mad_status = evt->xfer_iu->npiv_logout.common.status;
ibmvfc_free_event(evt);
switch (mad_status) {
case IBMVFC_MAD_SUCCESS:
if (list_empty(&vhost->sent) &&
vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
ibmvfc_init_host(vhost);
return;
}
break;
case IBMVFC_MAD_FAILED:
case IBMVFC_MAD_NOT_SUPPORTED:
case IBMVFC_MAD_CRQ_ERROR:
case IBMVFC_MAD_DRIVER_FAILED:
default:
ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
break;
}
ibmvfc_hard_reset_host(vhost);
}
/**
* ibmvfc_npiv_logout - Issue an NPIV Logout
* @vhost: ibmvfc host struct
*
**/
static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
{
struct ibmvfc_npiv_logout_mad *mad;
struct ibmvfc_event *evt;
evt = ibmvfc_get_event(vhost);
ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
mad = &evt->iu.npiv_logout;
memset(mad, 0, sizeof(*mad));
mad->common.version = 1;
mad->common.opcode = IBMVFC_NPIV_LOGOUT;
mad->common.length = sizeof(struct ibmvfc_npiv_logout_mad);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
if (!ibmvfc_send_event(evt, vhost, default_timeout))
ibmvfc_dbg(vhost, "Sent NPIV logout\n");
else
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
}
/**
* ibmvfc_dev_init_to_do - Is there target initialization work to do?
* @vhost: ibmvfc host struct
*
* Returns:
* 1 if work to do / 0 if not
**/
static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
{
struct ibmvfc_target *tgt;
list_for_each_entry(tgt, &vhost->targets, queue) {
if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
return 1;
}
return 0;
}
/**
* __ibmvfc_work_to_do - Is there task level work to do? (no locking)
* @vhost: ibmvfc host struct
*
* Returns:
* 1 if work to do / 0 if not
**/
static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
{
struct ibmvfc_target *tgt;
if (kthread_should_stop())
return 1;
switch (vhost->action) {
case IBMVFC_HOST_ACTION_NONE:
case IBMVFC_HOST_ACTION_INIT_WAIT:
case IBMVFC_HOST_ACTION_LOGO_WAIT:
return 0;
case IBMVFC_HOST_ACTION_TGT_INIT:
case IBMVFC_HOST_ACTION_QUERY_TGTS:
if (vhost->discovery_threads == disc_threads)
return 0;
list_for_each_entry(tgt, &vhost->targets, queue)
if (tgt->action == IBMVFC_TGT_ACTION_INIT)
return 1;
list_for_each_entry(tgt, &vhost->targets, queue)
if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
return 0;
return 1;
case IBMVFC_HOST_ACTION_LOGO:
case IBMVFC_HOST_ACTION_INIT:
case IBMVFC_HOST_ACTION_ALLOC_TGTS:
case IBMVFC_HOST_ACTION_TGT_DEL:
case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
case IBMVFC_HOST_ACTION_QUERY:
default:
break;
};
return 1;
}
/**
* ibmvfc_work_to_do - Is there task level work to do?
* @vhost: ibmvfc host struct
*
* Returns:
* 1 if work to do / 0 if not
**/
static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
{
unsigned long flags;
int rc;
spin_lock_irqsave(vhost->host->host_lock, flags);
rc = __ibmvfc_work_to_do(vhost);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return rc;
}
/**
* ibmvfc_log_ae - Log async events if necessary
* @vhost: ibmvfc host struct
* @events: events to log
*
**/
static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
{
if (events & IBMVFC_AE_RSCN)
fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
if ((events & IBMVFC_AE_LINKDOWN) &&
vhost->state >= IBMVFC_HALTED)
fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
if ((events & IBMVFC_AE_LINKUP) &&
vhost->state == IBMVFC_INITIALIZING)
fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
}
/**
* ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
* @tgt: ibmvfc target struct
*
**/
static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
{
struct ibmvfc_host *vhost = tgt->vhost;
struct fc_rport *rport;
unsigned long flags;
tgt_dbg(tgt, "Adding rport\n");
rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
spin_lock_irqsave(vhost->host->host_lock, flags);
if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
tgt_dbg(tgt, "Deleting rport\n");
list_del(&tgt->queue);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
fc_remote_port_delete(rport);
del_timer_sync(&tgt->timer);
kref_put(&tgt->kref, ibmvfc_release_tgt);
return;
}
if (rport) {
tgt_dbg(tgt, "rport add succeeded\n");
tgt->rport = rport;
rport->maxframe_size = tgt->service_parms.common.bb_rcv_sz & 0x0fff;
rport->supported_classes = 0;
tgt->target_id = rport->scsi_target_id;
if (tgt->service_parms.class1_parms[0] & 0x80000000)
rport->supported_classes |= FC_COS_CLASS1;
if (tgt->service_parms.class2_parms[0] & 0x80000000)
rport->supported_classes |= FC_COS_CLASS2;
if (tgt->service_parms.class3_parms[0] & 0x80000000)
rport->supported_classes |= FC_COS_CLASS3;
if (rport->rqst_q)
blk_queue_max_hw_segments(rport->rqst_q, 1);
} else
tgt_dbg(tgt, "rport add failed\n");
spin_unlock_irqrestore(vhost->host->host_lock, flags);
}
/**
* ibmvfc_do_work - Do task level work
* @vhost: ibmvfc host struct
*
**/
static void ibmvfc_do_work(struct ibmvfc_host *vhost)
{
struct ibmvfc_target *tgt;
unsigned long flags;
struct fc_rport *rport;
ibmvfc_log_ae(vhost, vhost->events_to_log);
spin_lock_irqsave(vhost->host->host_lock, flags);
vhost->events_to_log = 0;
switch (vhost->action) {
case IBMVFC_HOST_ACTION_NONE:
case IBMVFC_HOST_ACTION_LOGO_WAIT:
case IBMVFC_HOST_ACTION_INIT_WAIT:
break;
case IBMVFC_HOST_ACTION_LOGO:
vhost->job_step(vhost);
break;
case IBMVFC_HOST_ACTION_INIT:
BUG_ON(vhost->state != IBMVFC_INITIALIZING);
if (vhost->delay_init) {
vhost->delay_init = 0;
spin_unlock_irqrestore(vhost->host->host_lock, flags);
ssleep(15);
return;
} else
vhost->job_step(vhost);
break;
case IBMVFC_HOST_ACTION_QUERY:
list_for_each_entry(tgt, &vhost->targets, queue)
ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
break;
case IBMVFC_HOST_ACTION_QUERY_TGTS:
list_for_each_entry(tgt, &vhost->targets, queue) {
if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
tgt->job_step(tgt);
break;
}
}
if (!ibmvfc_dev_init_to_do(vhost))
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
break;
case IBMVFC_HOST_ACTION_TGT_DEL:
case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
list_for_each_entry(tgt, &vhost->targets, queue) {
if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
tgt_dbg(tgt, "Deleting rport\n");
rport = tgt->rport;
tgt->rport = NULL;
list_del(&tgt->queue);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
if (rport)
fc_remote_port_delete(rport);
del_timer_sync(&tgt->timer);
kref_put(&tgt->kref, ibmvfc_release_tgt);
return;
}
}
if (vhost->state == IBMVFC_INITIALIZING) {
if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
if (vhost->reinit) {
vhost->reinit = 0;
scsi_block_requests(vhost->host);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
} else {
ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
wake_up(&vhost->init_wait_q);
schedule_work(&vhost->rport_add_work_q);
vhost->init_retries = 0;
spin_unlock_irqrestore(vhost->host->host_lock, flags);
scsi_unblock_requests(vhost->host);
}
return;
} else {
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
vhost->job_step = ibmvfc_discover_targets;
}
} else {
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
scsi_unblock_requests(vhost->host);
wake_up(&vhost->init_wait_q);
return;
}
break;
case IBMVFC_HOST_ACTION_ALLOC_TGTS:
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
ibmvfc_alloc_targets(vhost);
spin_lock_irqsave(vhost->host->host_lock, flags);
break;
case IBMVFC_HOST_ACTION_TGT_INIT:
list_for_each_entry(tgt, &vhost->targets, queue) {
if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
tgt->job_step(tgt);
break;
}
}
if (!ibmvfc_dev_init_to_do(vhost))
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
break;
default:
break;
};
spin_unlock_irqrestore(vhost->host->host_lock, flags);
}
/**
* ibmvfc_work - Do task level work
* @data: ibmvfc host struct
*
* Returns:
* zero
**/
static int ibmvfc_work(void *data)
{
struct ibmvfc_host *vhost = data;
int rc;
set_user_nice(current, -20);
while (1) {
rc = wait_event_interruptible(vhost->work_wait_q,
ibmvfc_work_to_do(vhost));
BUG_ON(rc);
if (kthread_should_stop())
break;
ibmvfc_do_work(vhost);
}
ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
return 0;
}
/**
* ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
* @vhost: ibmvfc host struct
*
* Allocates a page for messages, maps it for dma, and registers
* the crq with the hypervisor.
*
* Return value:
* zero on success / other on failure
**/
static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
{
int rc, retrc = -ENOMEM;
struct device *dev = vhost->dev;
struct vio_dev *vdev = to_vio_dev(dev);
struct ibmvfc_crq_queue *crq = &vhost->crq;
ENTER;
crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
if (!crq->msgs)
return -ENOMEM;
crq->size = PAGE_SIZE / sizeof(*crq->msgs);
crq->msg_token = dma_map_single(dev, crq->msgs,
PAGE_SIZE, DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, crq->msg_token))
goto map_failed;
retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
crq->msg_token, PAGE_SIZE);
if (rc == H_RESOURCE)
/* maybe kexecing and resource is busy. try a reset */
retrc = rc = ibmvfc_reset_crq(vhost);
if (rc == H_CLOSED)
dev_warn(dev, "Partner adapter not ready\n");
else if (rc) {
dev_warn(dev, "Error %d opening adapter\n", rc);
goto reg_crq_failed;
}
retrc = 0;
tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
goto req_irq_failed;
}
if ((rc = vio_enable_interrupts(vdev))) {
dev_err(dev, "Error %d enabling interrupts\n", rc);
goto req_irq_failed;
}
crq->cur = 0;
LEAVE;
return retrc;
req_irq_failed:
tasklet_kill(&vhost->tasklet);
do {
rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
reg_crq_failed:
dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
map_failed:
free_page((unsigned long)crq->msgs);
return retrc;
}
/**
* ibmvfc_free_mem - Free memory for vhost
* @vhost: ibmvfc host struct
*
* Return value:
* none
**/
static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
{
struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
ENTER;
mempool_destroy(vhost->tgt_pool);
kfree(vhost->trace);
dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
vhost->disc_buf_dma);
dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
vhost->login_buf, vhost->login_buf_dma);
dma_pool_destroy(vhost->sg_pool);
dma_unmap_single(vhost->dev, async_q->msg_token,
async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
free_page((unsigned long)async_q->msgs);
LEAVE;
}
/**
* ibmvfc_alloc_mem - Allocate memory for vhost
* @vhost: ibmvfc host struct
*
* Return value:
* 0 on success / non-zero on failure
**/
static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
{
struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
struct device *dev = vhost->dev;
ENTER;
async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
if (!async_q->msgs) {
dev_err(dev, "Couldn't allocate async queue.\n");
goto nomem;
}
async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
async_q->msg_token = dma_map_single(dev, async_q->msgs,
async_q->size * sizeof(*async_q->msgs),
DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, async_q->msg_token)) {
dev_err(dev, "Failed to map async queue\n");
goto free_async_crq;
}
vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
SG_ALL * sizeof(struct srp_direct_buf),
sizeof(struct srp_direct_buf), 0);
if (!vhost->sg_pool) {
dev_err(dev, "Failed to allocate sg pool\n");
goto unmap_async_crq;
}
vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
&vhost->login_buf_dma, GFP_KERNEL);
if (!vhost->login_buf) {
dev_err(dev, "Couldn't allocate NPIV login buffer\n");
goto free_sg_pool;
}
vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
&vhost->disc_buf_dma, GFP_KERNEL);
if (!vhost->disc_buf) {
dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
goto free_login_buffer;
}
vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
if (!vhost->trace)
goto free_disc_buffer;
vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
sizeof(struct ibmvfc_target));
if (!vhost->tgt_pool) {
dev_err(dev, "Couldn't allocate target memory pool\n");
goto free_trace;
}
LEAVE;
return 0;
free_trace:
kfree(vhost->trace);
free_disc_buffer:
dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
vhost->disc_buf_dma);
free_login_buffer:
dma_free_coherent(dev, sizeof(*vhost->login_buf),
vhost->login_buf, vhost->login_buf_dma);
free_sg_pool:
dma_pool_destroy(vhost->sg_pool);
unmap_async_crq:
dma_unmap_single(dev, async_q->msg_token,
async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
free_async_crq:
free_page((unsigned long)async_q->msgs);
nomem:
LEAVE;
return -ENOMEM;
}
/**
* ibmvfc_rport_add_thread - Worker thread for rport adds
* @work: work struct
*
**/
static void ibmvfc_rport_add_thread(struct work_struct *work)
{
struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
rport_add_work_q);
struct ibmvfc_target *tgt;
struct fc_rport *rport;
unsigned long flags;
int did_work;
ENTER;
spin_lock_irqsave(vhost->host->host_lock, flags);
do {
did_work = 0;
if (vhost->state != IBMVFC_ACTIVE)
break;
list_for_each_entry(tgt, &vhost->targets, queue) {
if (tgt->add_rport) {
did_work = 1;
tgt->add_rport = 0;
kref_get(&tgt->kref);
rport = tgt->rport;
if (!rport) {
spin_unlock_irqrestore(vhost->host->host_lock, flags);
ibmvfc_tgt_add_rport(tgt);
} else if (get_device(&rport->dev)) {
spin_unlock_irqrestore(vhost->host->host_lock, flags);
tgt_dbg(tgt, "Setting rport roles\n");
fc_remote_port_rolechg(rport, tgt->ids.roles);
put_device(&rport->dev);
}
kref_put(&tgt->kref, ibmvfc_release_tgt);
spin_lock_irqsave(vhost->host->host_lock, flags);
break;
}
}
} while(did_work);
if (vhost->state == IBMVFC_ACTIVE)
vhost->scan_complete = 1;
spin_unlock_irqrestore(vhost->host->host_lock, flags);
LEAVE;
}
/**
* ibmvfc_probe - Adapter hot plug add entry point
* @vdev: vio device struct
* @id: vio device id struct
*
* Return value:
* 0 on success / non-zero on failure
**/
static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
{
struct ibmvfc_host *vhost;
struct Scsi_Host *shost;
struct device *dev = &vdev->dev;
int rc = -ENOMEM;
ENTER;
shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
if (!shost) {
dev_err(dev, "Couldn't allocate host data\n");
goto out;
}
shost->transportt = ibmvfc_transport_template;
shost->can_queue = max_requests;
shost->max_lun = max_lun;
shost->max_id = max_targets;
shost->max_sectors = IBMVFC_MAX_SECTORS;
shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
shost->unique_id = shost->host_no;
vhost = shost_priv(shost);
INIT_LIST_HEAD(&vhost->sent);
INIT_LIST_HEAD(&vhost->free);
INIT_LIST_HEAD(&vhost->targets);
sprintf(vhost->name, IBMVFC_NAME);
vhost->host = shost;
vhost->dev = dev;
vhost->partition_number = -1;
vhost->log_level = log_level;
vhost->task_set = 1;
strcpy(vhost->partition_name, "UNKNOWN");
init_waitqueue_head(&vhost->work_wait_q);
init_waitqueue_head(&vhost->init_wait_q);
INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
mutex_init(&vhost->passthru_mutex);
if ((rc = ibmvfc_alloc_mem(vhost)))
goto free_scsi_host;
vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
shost->host_no);
if (IS_ERR(vhost->work_thread)) {
dev_err(dev, "Couldn't create kernel thread: %ld\n",
PTR_ERR(vhost->work_thread));
goto free_host_mem;
}
if ((rc = ibmvfc_init_crq(vhost))) {
dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
goto kill_kthread;
}
if ((rc = ibmvfc_init_event_pool(vhost))) {
dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
goto release_crq;
}
if ((rc = scsi_add_host(shost, dev)))
goto release_event_pool;
if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
&ibmvfc_trace_attr))) {
dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
goto remove_shost;
}
if (shost_to_fc_host(shost)->rqst_q)
blk_queue_max_hw_segments(shost_to_fc_host(shost)->rqst_q, 1);
dev_set_drvdata(dev, vhost);
spin_lock(&ibmvfc_driver_lock);
list_add_tail(&vhost->queue, &ibmvfc_head);
spin_unlock(&ibmvfc_driver_lock);
ibmvfc_send_crq_init(vhost);
scsi_scan_host(shost);
return 0;
remove_shost:
scsi_remove_host(shost);
release_event_pool:
ibmvfc_free_event_pool(vhost);
release_crq:
ibmvfc_release_crq_queue(vhost);
kill_kthread:
kthread_stop(vhost->work_thread);
free_host_mem:
ibmvfc_free_mem(vhost);
free_scsi_host:
scsi_host_put(shost);
out:
LEAVE;
return rc;
}
/**
* ibmvfc_remove - Adapter hot plug remove entry point
* @vdev: vio device struct
*
* Return value:
* 0
**/
static int ibmvfc_remove(struct vio_dev *vdev)
{
struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
unsigned long flags;
ENTER;
ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
spin_lock_irqsave(vhost->host->host_lock, flags);
ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
ibmvfc_wait_while_resetting(vhost);
ibmvfc_release_crq_queue(vhost);
kthread_stop(vhost->work_thread);
fc_remove_host(vhost->host);
scsi_remove_host(vhost->host);
spin_lock_irqsave(vhost->host->host_lock, flags);
ibmvfc_purge_requests(vhost, DID_ERROR);
ibmvfc_free_event_pool(vhost);
spin_unlock_irqrestore(vhost->host->host_lock, flags);
ibmvfc_free_mem(vhost);
spin_lock(&ibmvfc_driver_lock);
list_del(&vhost->queue);
spin_unlock(&ibmvfc_driver_lock);
scsi_host_put(vhost->host);
LEAVE;
return 0;
}
/**
* ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
* @vdev: vio device struct
*
* Return value:
* Number of bytes the driver will need to DMA map at the same time in
* order to perform well.
*/
static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
{
unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
}
static struct vio_device_id ibmvfc_device_table[] __devinitdata = {
{"fcp", "IBM,vfc-client"},
{ "", "" }
};
MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
static struct vio_driver ibmvfc_driver = {
.id_table = ibmvfc_device_table,
.probe = ibmvfc_probe,
.remove = ibmvfc_remove,
.get_desired_dma = ibmvfc_get_desired_dma,
.driver = {
.name = IBMVFC_NAME,
.owner = THIS_MODULE,
}
};
static struct fc_function_template ibmvfc_transport_functions = {
.show_host_fabric_name = 1,
.show_host_node_name = 1,
.show_host_port_name = 1,
.show_host_supported_classes = 1,
.show_host_port_type = 1,
.show_host_port_id = 1,
.show_host_maxframe_size = 1,
.get_host_port_state = ibmvfc_get_host_port_state,
.show_host_port_state = 1,
.get_host_speed = ibmvfc_get_host_speed,
.show_host_speed = 1,
.issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
.terminate_rport_io = ibmvfc_terminate_rport_io,
.show_rport_maxframe_size = 1,
.show_rport_supported_classes = 1,
.set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
.show_rport_dev_loss_tmo = 1,
.get_starget_node_name = ibmvfc_get_starget_node_name,
.show_starget_node_name = 1,
.get_starget_port_name = ibmvfc_get_starget_port_name,
.show_starget_port_name = 1,
.get_starget_port_id = ibmvfc_get_starget_port_id,
.show_starget_port_id = 1,
.bsg_request = ibmvfc_bsg_request,
.bsg_timeout = ibmvfc_bsg_timeout,
};
/**
* ibmvfc_module_init - Initialize the ibmvfc module
*
* Return value:
* 0 on success / other on failure
**/
static int __init ibmvfc_module_init(void)
{
int rc;
if (!firmware_has_feature(FW_FEATURE_VIO))
return -ENODEV;
printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
if (!ibmvfc_transport_template)
return -ENOMEM;
rc = vio_register_driver(&ibmvfc_driver);
if (rc)
fc_release_transport(ibmvfc_transport_template);
return rc;
}
/**
* ibmvfc_module_exit - Teardown the ibmvfc module
*
* Return value:
* nothing
**/
static void __exit ibmvfc_module_exit(void)
{
vio_unregister_driver(&ibmvfc_driver);
fc_release_transport(ibmvfc_transport_template);
}
module_init(ibmvfc_module_init);
module_exit(ibmvfc_module_exit);
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