blob: ed1e728763a2192c14acfe1322ef227ddc01f129 [file] [log] [blame]
/*
* 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 "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 | S_IWUSR);
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, 0, 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 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:
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_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_ADD:
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_INIT:
case IBMVFC_HOST_ACTION_TGT_DEL:
case IBMVFC_HOST_ACTION_QUERY_TGTS:
case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
case IBMVFC_HOST_ACTION_TGT_ADD:
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
* @relogin: is this a re-login?
*
* Return value:
* nothing
**/
static void ibmvfc_init_host(struct ibmvfc_host *vhost, int relogin)
{
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)) {
if (!relogin) {
memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
vhost->async_crq.cur = 0;
}
list_for_each_entry(tgt, &vhost->targets, queue)
tgt->need_login = 1;
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);
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;
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;
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_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)
{
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
* @vhost: struct ibmvfc host to reset
**/
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
*
**/
static void ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
{
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);
}
wake_up(&vhost->work_wait_q);
}
/**
* __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;
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_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_reinit_host(evt->vhost);
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_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) {
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) {
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 - Device iterated cancel all function
* @sdev: scsi device struct
* @data: return code
*
**/
static void ibmvfc_dev_cancel_all(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_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);
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);
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_LINK_UP:
case IBMVFC_AE_RESUME:
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;
case IBMVFC_AE_ELS_LOGO:
case IBMVFC_AE_ELS_PRLO:
case IBMVFC_AE_ELS_PLOGI:
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, 0);
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, 0);
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;
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->state != IBMVFC_NO_CRQ && vhost->action == IBMVFC_HOST_ACTION_NONE)
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
*
* Return value:
* actual depth set
**/
static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
{
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 struct device_attribute ibmvfc_host_partition_name = {
.attr = {
.name = "partition_name",
.mode = S_IRUGO,
},
.show = ibmvfc_show_host_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 struct device_attribute ibmvfc_host_device_name = {
.attr = {
.name = "device_name",
.mode = S_IRUGO,
},
.show = ibmvfc_show_host_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 struct device_attribute ibmvfc_host_loc_code = {
.attr = {
.name = "port_loc_code",
.mode = S_IRUGO,
},
.show = ibmvfc_show_host_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 struct device_attribute ibmvfc_host_drc_name = {
.attr = {
.name = "drc_name",
.mode = S_IRUGO,
},
.show = ibmvfc_show_host_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 struct device_attribute ibmvfc_host_npiv_version = {
.attr = {
.name = "npiv_version",
.mode = S_IRUGO,
},
.show = ibmvfc_show_host_npiv_version,
};
/**
* 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 struct device_attribute ibmvfc_log_level_attr = {
.attr = {
.name = "log_level",
.mode = S_IRUGO | S_IWUSR,
},
.show = ibmvfc_show_log_level,
.store = 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[] = {
&ibmvfc_host_partition_name,
&ibmvfc_host_device_name,
&ibmvfc_host_loc_code,
&ibmvfc_host_drc_name,
&ibmvfc_host_npiv_version,
&ibmvfc_log_level_attr,
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;
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);
vio_disable_interrupts(to_vio_dev(vhost->dev));
while (!done) {
/* Pull all the valid messages off the CRQ */
while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
ibmvfc_handle_crq(crq, vhost);
crq->valid = 0;
}
/* 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;
}
vio_enable_interrupts(vdev);
if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
vio_disable_interrupts(vdev);
ibmvfc_handle_crq(crq, vhost);
crq->valid = 0;
} else if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
vio_disable_interrupts(vdev);
ibmvfc_handle_async(async, vhost);
async->valid = 0;
} else
done = 1;
}
spin_unlock_irqrestore(vhost->host->host_lock, flags);
return IRQ_HANDLED;
}
/**
* 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
*
**/
static void 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);
} else
ibmvfc_init_tgt(tgt, job_step);
}
/**
* 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;
u32 status = rsp->common.status;
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
switch (status) {
case IBMVFC_MAD_SUCCESS:
tgt_dbg(tgt, "Process Login succeeded\n");
tgt->need_login = 0;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_ADD_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:
tgt_err(tgt, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
ibmvfc_get_cmd_error(rsp->status, rsp->error),
rsp->status, rsp->error, status);
if (ibmvfc_retry_cmd(rsp->status, rsp->error))
ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
else
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
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;
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;
tgt->ids.roles = FC_PORT_ROLE_FCP_TARGET;
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:
tgt_err(tgt, "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);
if (ibmvfc_retry_cmd(rsp->status, rsp->error))
ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
else
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
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);
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;
}