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kernel-fxtec-pro1x/drivers/s390/scsi/zfcp_aux.c
Volker Sameske fea9d6c7bc [SCSI] zfcp: improve management of request IDs 
Improve request handling. Use hash table to manage request IDs.

Signed-off-by: Volker Sameske <sameske@de.ibm.com>
Signed-off-by: Andreas Herrmann <aherrman@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-08-06 11:31:00 -05:00

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/*
* This file is part of the zfcp device driver for
* FCP adapters for IBM System z9 and zSeries.
*
* (C) Copyright IBM Corp. 2002, 2006
*
* 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* Driver authors:
* Martin Peschke (originator of the driver)
* Raimund Schroeder
* Aron Zeh
* Wolfgang Taphorn
* Stefan Bader
* Heiko Carstens (kernel 2.6 port of the driver)
* Andreas Herrmann
* Maxim Shchetynin
* Volker Sameske
* Ralph Wuerthner
*/
#include "zfcp_ext.h"
/* accumulated log level (module parameter) */
static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
static char *device;
/*********************** FUNCTION PROTOTYPES *********************************/
/* written against the module interface */
static int __init zfcp_module_init(void);
/* FCP related */
static void zfcp_ns_gid_pn_handler(unsigned long);
/* miscellaneous */
static inline int zfcp_sg_list_alloc(struct zfcp_sg_list *, size_t);
static inline void zfcp_sg_list_free(struct zfcp_sg_list *);
static inline int zfcp_sg_list_copy_from_user(struct zfcp_sg_list *,
void __user *, size_t);
static inline int zfcp_sg_list_copy_to_user(void __user *,
struct zfcp_sg_list *, size_t);
static long zfcp_cfdc_dev_ioctl(struct file *, unsigned int, unsigned long);
#define ZFCP_CFDC_IOC_MAGIC 0xDD
#define ZFCP_CFDC_IOC \
_IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_sense_data)
static struct file_operations zfcp_cfdc_fops = {
.unlocked_ioctl = zfcp_cfdc_dev_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = zfcp_cfdc_dev_ioctl
#endif
};
static struct miscdevice zfcp_cfdc_misc = {
.minor = ZFCP_CFDC_DEV_MINOR,
.name = ZFCP_CFDC_DEV_NAME,
.fops = &zfcp_cfdc_fops
};
/*********************** KERNEL/MODULE PARAMETERS ***************************/
/* declare driver module init/cleanup functions */
module_init(zfcp_module_init);
MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
MODULE_DESCRIPTION
("FCP (SCSI over Fibre Channel) HBA driver for IBM System z9 and zSeries");
MODULE_LICENSE("GPL");
module_param(device, charp, 0400);
MODULE_PARM_DESC(device, "specify initial device");
module_param(loglevel, uint, 0400);
MODULE_PARM_DESC(loglevel,
"log levels, 8 nibbles: "
"FC ERP QDIO CIO Config FSF SCSI Other, "
"levels: 0=none 1=normal 2=devel 3=trace");
/****************************************************************/
/************** Functions without logging ***********************/
/****************************************************************/
void
_zfcp_hex_dump(char *addr, int count)
{
int i;
for (i = 0; i < count; i++) {
printk("%02x", addr[i]);
if ((i % 4) == 3)
printk(" ");
if ((i % 32) == 31)
printk("\n");
}
if (((i-1) % 32) != 31)
printk("\n");
}
/****************************************************************/
/****** Functions to handle the request ID hash table ********/
/****************************************************************/
#define ZFCP_LOG_AREA ZFCP_LOG_AREA_FSF
static int zfcp_reqlist_init(struct zfcp_adapter *adapter)
{
int i;
adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head),
GFP_KERNEL);
if (!adapter->req_list)
return -ENOMEM;
for (i=0; i<REQUEST_LIST_SIZE; i++)
INIT_LIST_HEAD(&adapter->req_list[i]);
return 0;
}
static void zfcp_reqlist_free(struct zfcp_adapter *adapter)
{
struct zfcp_fsf_req *request, *tmp;
unsigned int i;
for (i=0; i<REQUEST_LIST_SIZE; i++) {
if (list_empty(&adapter->req_list[i]))
continue;
list_for_each_entry_safe(request, tmp,
&adapter->req_list[i], list)
list_del(&request->list);
}
kfree(adapter->req_list);
}
void zfcp_reqlist_add(struct zfcp_adapter *adapter,
struct zfcp_fsf_req *fsf_req)
{
unsigned int i;
i = fsf_req->req_id % REQUEST_LIST_SIZE;
list_add_tail(&fsf_req->list, &adapter->req_list[i]);
}
void zfcp_reqlist_remove(struct zfcp_adapter *adapter, unsigned long req_id)
{
struct zfcp_fsf_req *request, *tmp;
unsigned int i, counter;
u64 dbg_tmp[2];
i = req_id % REQUEST_LIST_SIZE;
BUG_ON(list_empty(&adapter->req_list[i]));
counter = 0;
list_for_each_entry_safe(request, tmp, &adapter->req_list[i], list) {
if (request->req_id == req_id) {
dbg_tmp[0] = (u64) atomic_read(&adapter->reqs_active);
dbg_tmp[1] = (u64) counter;
debug_event(adapter->erp_dbf, 4, (void *) dbg_tmp, 16);
list_del(&request->list);
break;
}
counter++;
}
}
struct zfcp_fsf_req *zfcp_reqlist_ismember(struct zfcp_adapter *adapter,
unsigned long req_id)
{
struct zfcp_fsf_req *request, *tmp;
unsigned int i;
i = req_id % REQUEST_LIST_SIZE;
list_for_each_entry_safe(request, tmp, &adapter->req_list[i], list)
if (request->req_id == req_id)
return request;
return NULL;
}
int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
{
unsigned int i;
for (i=0; i<REQUEST_LIST_SIZE; i++)
if (!list_empty(&adapter->req_list[i]))
return 0;
return 1;
}
#undef ZFCP_LOG_AREA
/****************************************************************/
/************** Uncategorised Functions *************************/
/****************************************************************/
#define ZFCP_LOG_AREA ZFCP_LOG_AREA_OTHER
/**
* zfcp_device_setup - setup function
* @str: pointer to parameter string
*
* Parse "device=..." parameter string.
*/
static int __init
zfcp_device_setup(char *devstr)
{
char *tmp, *str;
size_t len;
if (!devstr)
return 0;
len = strlen(devstr) + 1;
str = (char *) kmalloc(len, GFP_KERNEL);
if (!str)
goto err_out;
memcpy(str, devstr, len);
tmp = strchr(str, ',');
if (!tmp)
goto err_out;
*tmp++ = '\0';
strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
if (*tmp++ != ',')
goto err_out;
if (*tmp == '\0')
goto err_out;
zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
if (*tmp != '\0')
goto err_out;
kfree(str);
return 1;
err_out:
ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
kfree(str);
return 0;
}
static void __init
zfcp_init_device_configure(void)
{
struct zfcp_adapter *adapter;
struct zfcp_port *port;
struct zfcp_unit *unit;
down(&zfcp_data.config_sema);
read_lock_irq(&zfcp_data.config_lock);
adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
if (adapter)
zfcp_adapter_get(adapter);
read_unlock_irq(&zfcp_data.config_lock);
if (adapter == NULL)
goto out_adapter;
port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
if (!port)
goto out_port;
unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
if (!unit)
goto out_unit;
up(&zfcp_data.config_sema);
ccw_device_set_online(adapter->ccw_device);
zfcp_erp_wait(adapter);
down(&zfcp_data.config_sema);
zfcp_unit_put(unit);
out_unit:
zfcp_port_put(port);
out_port:
zfcp_adapter_put(adapter);
out_adapter:
up(&zfcp_data.config_sema);
return;
}
static int __init
zfcp_module_init(void)
{
int retval = 0;
atomic_set(&zfcp_data.loglevel, loglevel);
/* initialize adapter list */
INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
/* initialize adapters to be removed list head */
INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
zfcp_transport_template = fc_attach_transport(&zfcp_transport_functions);
if (!zfcp_transport_template)
return -ENODEV;
retval = misc_register(&zfcp_cfdc_misc);
if (retval != 0) {
ZFCP_LOG_INFO("registration of misc device "
"zfcp_cfdc failed\n");
goto out;
}
ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
/* Initialise proc semaphores */
sema_init(&zfcp_data.config_sema, 1);
/* initialise configuration rw lock */
rwlock_init(&zfcp_data.config_lock);
/* save address of data structure managing the driver module */
zfcp_data.scsi_host_template.module = THIS_MODULE;
/* setup dynamic I/O */
retval = zfcp_ccw_register();
if (retval) {
ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
goto out_ccw_register;
}
if (zfcp_device_setup(device))
zfcp_init_device_configure();
goto out;
out_ccw_register:
misc_deregister(&zfcp_cfdc_misc);
out:
return retval;
}
/*
* function: zfcp_cfdc_dev_ioctl
*
* purpose: Handle control file upload/download transaction via IOCTL
* interface
*
* returns: 0 - Operation completed successfuly
* -ENOTTY - Unknown IOCTL command
* -EINVAL - Invalid sense data record
* -ENXIO - The FCP adapter is not available
* -EOPNOTSUPP - The FCP adapter does not have CFDC support
* -ENOMEM - Insufficient memory
* -EFAULT - User space memory I/O operation fault
* -EPERM - Cannot create or queue FSF request or create SBALs
* -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
*/
static long
zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
unsigned long buffer)
{
struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
struct zfcp_adapter *adapter = NULL;
struct zfcp_fsf_req *fsf_req = NULL;
struct zfcp_sg_list *sg_list = NULL;
u32 fsf_command, option;
char *bus_id = NULL;
int retval = 0;
sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
if (sense_data == NULL) {
retval = -ENOMEM;
goto out;
}
sg_list = kzalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
if (sg_list == NULL) {
retval = -ENOMEM;
goto out;
}
if (command != ZFCP_CFDC_IOC) {
ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
retval = -ENOTTY;
goto out;
}
if ((sense_data_user = (void __user *) buffer) == NULL) {
ZFCP_LOG_INFO("sense data record is required\n");
retval = -EINVAL;
goto out;
}
retval = copy_from_user(sense_data, sense_data_user,
sizeof(struct zfcp_cfdc_sense_data));
if (retval) {
retval = -EFAULT;
goto out;
}
if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
ZFCP_CFDC_SIGNATURE);
retval = -EINVAL;
goto out;
}
switch (sense_data->command) {
case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
option = FSF_CFDC_OPTION_NORMAL_MODE;
break;
case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
option = FSF_CFDC_OPTION_FORCE;
break;
case ZFCP_CFDC_CMND_FULL_ACCESS:
fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
option = FSF_CFDC_OPTION_FULL_ACCESS;
break;
case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
break;
case ZFCP_CFDC_CMND_UPLOAD:
fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
option = 0;
break;
default:
ZFCP_LOG_INFO("invalid command code 0x%08x\n",
sense_data->command);
retval = -EINVAL;
goto out;
}
bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
if (bus_id == NULL) {
retval = -ENOMEM;
goto out;
}
snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
(sense_data->devno >> 24),
(sense_data->devno >> 16) & 0xFF,
(sense_data->devno & 0xFFFF));
read_lock_irq(&zfcp_data.config_lock);
adapter = zfcp_get_adapter_by_busid(bus_id);
if (adapter)
zfcp_adapter_get(adapter);
read_unlock_irq(&zfcp_data.config_lock);
kfree(bus_id);
if (adapter == NULL) {
ZFCP_LOG_INFO("invalid adapter\n");
retval = -ENXIO;
goto out;
}
if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
retval = zfcp_sg_list_alloc(sg_list,
ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
if (retval) {
retval = -ENOMEM;
goto out;
}
}
if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
(sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
retval = zfcp_sg_list_copy_from_user(
sg_list, &sense_data_user->control_file,
ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
if (retval) {
retval = -EFAULT;
goto out;
}
}
retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
option, sg_list);
if (retval)
goto out;
if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
(fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
retval = -ENXIO;
goto out;
}
sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
memcpy(&sense_data->fsf_status_qual,
&fsf_req->qtcb->header.fsf_status_qual,
sizeof(union fsf_status_qual));
memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
retval = copy_to_user(sense_data_user, sense_data,
sizeof(struct zfcp_cfdc_sense_data));
if (retval) {
retval = -EFAULT;
goto out;
}
if (sense_data->command & ZFCP_CFDC_UPLOAD) {
retval = zfcp_sg_list_copy_to_user(
&sense_data_user->control_file, sg_list,
ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
if (retval) {
retval = -EFAULT;
goto out;
}
}
out:
if (fsf_req != NULL)
zfcp_fsf_req_free(fsf_req);
if ((adapter != NULL) && (retval != -ENXIO))
zfcp_adapter_put(adapter);
if (sg_list != NULL) {
zfcp_sg_list_free(sg_list);
kfree(sg_list);
}
kfree(sense_data);
return retval;
}
/**
* zfcp_sg_list_alloc - create a scatter-gather list of the specified size
* @sg_list: structure describing a scatter gather list
* @size: size of scatter-gather list
* Return: 0 on success, else -ENOMEM
*
* In sg_list->sg a pointer to the created scatter-gather list is returned,
* or NULL if we run out of memory. sg_list->count specifies the number of
* elements of the scatter-gather list. The maximum size of a single element
* in the scatter-gather list is PAGE_SIZE.
*/
static inline int
zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
{
struct scatterlist *sg;
unsigned int i;
int retval = 0;
void *address;
BUG_ON(sg_list == NULL);
sg_list->count = size >> PAGE_SHIFT;
if (size & ~PAGE_MASK)
sg_list->count++;
sg_list->sg = kcalloc(sg_list->count, sizeof(struct scatterlist),
GFP_KERNEL);
if (sg_list->sg == NULL) {
sg_list->count = 0;
retval = -ENOMEM;
goto out;
}
for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
sg->length = min(size, PAGE_SIZE);
sg->offset = 0;
address = (void *) get_zeroed_page(GFP_KERNEL);
if (address == NULL) {
sg_list->count = i;
zfcp_sg_list_free(sg_list);
retval = -ENOMEM;
goto out;
}
zfcp_address_to_sg(address, sg);
size -= sg->length;
}
out:
return retval;
}
/**
* zfcp_sg_list_free - free memory of a scatter-gather list
* @sg_list: structure describing a scatter-gather list
*
* Memory for each element in the scatter-gather list is freed.
* Finally sg_list->sg is freed itself and sg_list->count is reset.
*/
static inline void
zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
{
struct scatterlist *sg;
unsigned int i;
BUG_ON(sg_list == NULL);
for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
free_page((unsigned long) zfcp_sg_to_address(sg));
sg_list->count = 0;
kfree(sg_list->sg);
}
/**
* zfcp_sg_size - determine size of a scatter-gather list
* @sg: array of (struct scatterlist)
* @sg_count: elements in array
* Return: size of entire scatter-gather list
*/
size_t
zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
{
unsigned int i;
struct scatterlist *p;
size_t size;
size = 0;
for (i = 0, p = sg; i < sg_count; i++, p++) {
BUG_ON(p == NULL);
size += p->length;
}
return size;
}
/**
* zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
* @sg_list: structure describing a scatter-gather list
* @user_buffer: pointer to buffer in user space
* @size: number of bytes to be copied
* Return: 0 on success, -EFAULT if copy_from_user fails.
*/
static inline int
zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
void __user *user_buffer,
size_t size)
{
struct scatterlist *sg;
unsigned int length;
void *zfcp_buffer;
int retval = 0;
BUG_ON(sg_list == NULL);
if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
return -EFAULT;
for (sg = sg_list->sg; size > 0; sg++) {
length = min((unsigned int)size, sg->length);
zfcp_buffer = zfcp_sg_to_address(sg);
if (copy_from_user(zfcp_buffer, user_buffer, length)) {
retval = -EFAULT;
goto out;
}
user_buffer += length;
size -= length;
}
out:
return retval;
}
/**
* zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
* @user_buffer: pointer to buffer in user space
* @sg_list: structure describing a scatter-gather list
* @size: number of bytes to be copied
* Return: 0 on success, -EFAULT if copy_to_user fails
*/
static inline int
zfcp_sg_list_copy_to_user(void __user *user_buffer,
struct zfcp_sg_list *sg_list,
size_t size)
{
struct scatterlist *sg;
unsigned int length;
void *zfcp_buffer;
int retval = 0;
BUG_ON(sg_list == NULL);
if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
return -EFAULT;
for (sg = sg_list->sg; size > 0; sg++) {
length = min((unsigned int) size, sg->length);
zfcp_buffer = zfcp_sg_to_address(sg);
if (copy_to_user(user_buffer, zfcp_buffer, length)) {
retval = -EFAULT;
goto out;
}
user_buffer += length;
size -= length;
}
out:
return retval;
}
#undef ZFCP_LOG_AREA
/****************************************************************/
/****** Functions for configuration/set-up of structures ********/
/****************************************************************/
#define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
/**
* zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
* @port: pointer to port to search for unit
* @fcp_lun: FCP LUN to search for
* Traverse list of all units of a port and return pointer to a unit
* with the given FCP LUN.
*/
struct zfcp_unit *
zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
{
struct zfcp_unit *unit;
int found = 0;
list_for_each_entry(unit, &port->unit_list_head, list) {
if ((unit->fcp_lun == fcp_lun) &&
!atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
{
found = 1;
break;
}
}
return found ? unit : NULL;
}
/**
* zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
* @adapter: pointer to adapter to search for port
* @wwpn: wwpn to search for
* Traverse list of all ports of an adapter and return pointer to a port
* with the given wwpn.
*/
struct zfcp_port *
zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
{
struct zfcp_port *port;
int found = 0;
list_for_each_entry(port, &adapter->port_list_head, list) {
if ((port->wwpn == wwpn) &&
!(atomic_read(&port->status) &
(ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
found = 1;
break;
}
}
return found ? port : NULL;
}
/**
* zfcp_get_port_by_did - find port in port list of adapter by d_id
* @adapter: pointer to adapter to search for port
* @d_id: d_id to search for
* Traverse list of all ports of an adapter and return pointer to a port
* with the given d_id.
*/
struct zfcp_port *
zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
{
struct zfcp_port *port;
int found = 0;
list_for_each_entry(port, &adapter->port_list_head, list) {
if ((port->d_id == d_id) &&
!atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
{
found = 1;
break;
}
}
return found ? port : NULL;
}
/**
* zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
* @bus_id: bus_id to search for
* Traverse list of all adapters and return pointer to an adapter
* with the given bus_id.
*/
struct zfcp_adapter *
zfcp_get_adapter_by_busid(char *bus_id)
{
struct zfcp_adapter *adapter;
int found = 0;
list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
BUS_ID_SIZE) == 0) &&
!atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
&adapter->status)){
found = 1;
break;
}
}
return found ? adapter : NULL;
}
/**
* zfcp_unit_enqueue - enqueue unit to unit list of a port.
* @port: pointer to port where unit is added
* @fcp_lun: FCP LUN of unit to be enqueued
* Return: pointer to enqueued unit on success, NULL on error
* Locks: config_sema must be held to serialize changes to the unit list
*
* Sets up some unit internal structures and creates sysfs entry.
*/
struct zfcp_unit *
zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
{
struct zfcp_unit *unit, *tmp_unit;
unsigned int scsi_lun;
int found;
/*
* check that there is no unit with this FCP_LUN already in list
* and enqueue it.
* Note: Unlike for the adapter and the port, this is an error
*/
read_lock_irq(&zfcp_data.config_lock);
unit = zfcp_get_unit_by_lun(port, fcp_lun);
read_unlock_irq(&zfcp_data.config_lock);
if (unit)
return NULL;
unit = kzalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
if (!unit)
return NULL;
/* initialise reference count stuff */
atomic_set(&unit->refcount, 0);
init_waitqueue_head(&unit->remove_wq);
unit->port = port;
unit->fcp_lun = fcp_lun;
/* setup for sysfs registration */
snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
unit->sysfs_device.parent = &port->sysfs_device;
unit->sysfs_device.release = zfcp_sysfs_unit_release;
dev_set_drvdata(&unit->sysfs_device, unit);
/* mark unit unusable as long as sysfs registration is not complete */
atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
if (device_register(&unit->sysfs_device)) {
kfree(unit);
return NULL;
}
if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
device_unregister(&unit->sysfs_device);
return NULL;
}
zfcp_unit_get(unit);
scsi_lun = 0;
found = 0;
write_lock_irq(&zfcp_data.config_lock);
list_for_each_entry(tmp_unit, &port->unit_list_head, list) {
if (tmp_unit->scsi_lun != scsi_lun) {
found = 1;
break;
}
scsi_lun++;
}
unit->scsi_lun = scsi_lun;
if (found)
list_add_tail(&unit->list, &tmp_unit->list);
else
list_add_tail(&unit->list, &port->unit_list_head);
atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
write_unlock_irq(&zfcp_data.config_lock);
port->units++;
zfcp_port_get(port);
return unit;
}
void
zfcp_unit_dequeue(struct zfcp_unit *unit)
{
zfcp_unit_wait(unit);
write_lock_irq(&zfcp_data.config_lock);
list_del(&unit->list);
write_unlock_irq(&zfcp_data.config_lock);
unit->port->units--;
zfcp_port_put(unit->port);
zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
device_unregister(&unit->sysfs_device);
}
/*
* Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
* commands.
* It also genrates fcp-nameserver request/response buffer and unsolicited
* status read fsf_req buffers.
*
* locks: must only be called with zfcp_data.config_sema taken
*/
static int
zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
{
adapter->pool.fsf_req_erp =
mempool_create_kmalloc_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
sizeof(struct zfcp_fsf_req_pool_element));
if (!adapter->pool.fsf_req_erp)
return -ENOMEM;
adapter->pool.fsf_req_scsi =
mempool_create_kmalloc_pool(ZFCP_POOL_FSF_REQ_SCSI_NR,
sizeof(struct zfcp_fsf_req_pool_element));
if (!adapter->pool.fsf_req_scsi)
return -ENOMEM;
adapter->pool.fsf_req_abort =
mempool_create_kmalloc_pool(ZFCP_POOL_FSF_REQ_ABORT_NR,
sizeof(struct zfcp_fsf_req_pool_element));
if (!adapter->pool.fsf_req_abort)
return -ENOMEM;
adapter->pool.fsf_req_status_read =
mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
sizeof(struct zfcp_fsf_req));
if (!adapter->pool.fsf_req_status_read)
return -ENOMEM;
adapter->pool.data_status_read =
mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
sizeof(struct fsf_status_read_buffer));
if (!adapter->pool.data_status_read)
return -ENOMEM;
adapter->pool.data_gid_pn =
mempool_create_kmalloc_pool(ZFCP_POOL_DATA_GID_PN_NR,
sizeof(struct zfcp_gid_pn_data));
if (!adapter->pool.data_gid_pn)
return -ENOMEM;
return 0;
}
/**
* zfcp_free_low_mem_buffers - free memory pools of an adapter
* @adapter: pointer to zfcp_adapter for which memory pools should be freed
* locking: zfcp_data.config_sema must be held
*/
static void
zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
{
if (adapter->pool.fsf_req_erp)
mempool_destroy(adapter->pool.fsf_req_erp);
if (adapter->pool.fsf_req_scsi)
mempool_destroy(adapter->pool.fsf_req_scsi);
if (adapter->pool.fsf_req_abort)
mempool_destroy(adapter->pool.fsf_req_abort);
if (adapter->pool.fsf_req_status_read)
mempool_destroy(adapter->pool.fsf_req_status_read);
if (adapter->pool.data_status_read)
mempool_destroy(adapter->pool.data_status_read);
if (adapter->pool.data_gid_pn)
mempool_destroy(adapter->pool.data_gid_pn);
}
void
zfcp_dummy_release(struct device *dev)
{
return;
}
/*
* Enqueues an adapter at the end of the adapter list in the driver data.
* All adapter internal structures are set up.
* Proc-fs entries are also created.
*
* returns: 0 if a new adapter was successfully enqueued
* ZFCP_KNOWN if an adapter with this devno was already present
* -ENOMEM if alloc failed
* locks: config_sema must be held to serialise changes to the adapter list
*/
struct zfcp_adapter *
zfcp_adapter_enqueue(struct ccw_device *ccw_device)
{
int retval = 0;
struct zfcp_adapter *adapter;
/*
* Note: It is safe to release the list_lock, as any list changes
* are protected by the config_sema, which must be held to get here
*/
/* try to allocate new adapter data structure (zeroed) */
adapter = kzalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
if (!adapter) {
ZFCP_LOG_INFO("error: allocation of base adapter "
"structure failed\n");
goto out;
}
ccw_device->handler = NULL;
/* save ccw_device pointer */
adapter->ccw_device = ccw_device;
retval = zfcp_qdio_allocate_queues(adapter);
if (retval)
goto queues_alloc_failed;
retval = zfcp_qdio_allocate(adapter);
if (retval)
goto qdio_allocate_failed;
retval = zfcp_allocate_low_mem_buffers(adapter);
if (retval) {
ZFCP_LOG_INFO("error: pool allocation failed\n");
goto failed_low_mem_buffers;
}
/* initialise reference count stuff */
atomic_set(&adapter->refcount, 0);
init_waitqueue_head(&adapter->remove_wq);
/* initialise list of ports */
INIT_LIST_HEAD(&adapter->port_list_head);
/* initialise list of ports to be removed */
INIT_LIST_HEAD(&adapter->port_remove_lh);
/* initialize list of fsf requests */
spin_lock_init(&adapter->req_list_lock);
retval = zfcp_reqlist_init(adapter);
if (retval) {
ZFCP_LOG_INFO("request list initialization failed\n");
goto failed_low_mem_buffers;
}
/* initialize debug locks */
spin_lock_init(&adapter->erp_dbf_lock);
spin_lock_init(&adapter->hba_dbf_lock);
spin_lock_init(&adapter->san_dbf_lock);
spin_lock_init(&adapter->scsi_dbf_lock);
/* initialize error recovery stuff */
rwlock_init(&adapter->erp_lock);
sema_init(&adapter->erp_ready_sem, 0);
INIT_LIST_HEAD(&adapter->erp_ready_head);
INIT_LIST_HEAD(&adapter->erp_running_head);
/* initialize abort lock */
rwlock_init(&adapter->abort_lock);
/* initialise some erp stuff */
init_waitqueue_head(&adapter->erp_thread_wqh);
init_waitqueue_head(&adapter->erp_done_wqh);
/* initialize lock of associated request queue */
rwlock_init(&adapter->request_queue.queue_lock);
/* intitialise SCSI ER timer */
init_timer(&adapter->scsi_er_timer);
/* mark adapter unusable as long as sysfs registration is not complete */
atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
adapter->ccw_device = ccw_device;
dev_set_drvdata(&ccw_device->dev, adapter);
if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
goto sysfs_failed;
adapter->generic_services.parent = &adapter->ccw_device->dev;
adapter->generic_services.release = zfcp_dummy_release;
snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
"generic_services");
if (device_register(&adapter->generic_services))
goto generic_services_failed;
/* put allocated adapter at list tail */
write_lock_irq(&zfcp_data.config_lock);
atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
write_unlock_irq(&zfcp_data.config_lock);
zfcp_data.adapters++;
goto out;
generic_services_failed:
zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
sysfs_failed:
dev_set_drvdata(&ccw_device->dev, NULL);
failed_low_mem_buffers:
zfcp_free_low_mem_buffers(adapter);
if (qdio_free(ccw_device) != 0)
ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
zfcp_get_busid_by_adapter(adapter));
qdio_allocate_failed:
zfcp_qdio_free_queues(adapter);
queues_alloc_failed:
kfree(adapter);
adapter = NULL;
out:
return adapter;
}
/*
* returns: 0 - struct zfcp_adapter data structure successfully removed
* !0 - struct zfcp_adapter data structure could not be removed
* (e.g. still used)
* locks: adapter list write lock is assumed to be held by caller
*/
void
zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
{
int retval = 0;
unsigned long flags;
device_unregister(&adapter->generic_services);
zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
dev_set_drvdata(&adapter->ccw_device->dev, NULL);
/* sanity check: no pending FSF requests */
spin_lock_irqsave(&adapter->req_list_lock, flags);
retval = zfcp_reqlist_isempty(adapter);
spin_unlock_irqrestore(&adapter->req_list_lock, flags);
if (!retval) {
ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
"%i requests outstanding\n",
zfcp_get_busid_by_adapter(adapter), adapter,
atomic_read(&adapter->reqs_active));
retval = -EBUSY;
goto out;
}
/* remove specified adapter data structure from list */
write_lock_irq(&zfcp_data.config_lock);
list_del(&adapter->list);
write_unlock_irq(&zfcp_data.config_lock);
/* decrease number of adapters in list */
zfcp_data.adapters--;
ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
"%i adapters still in list\n",
zfcp_get_busid_by_adapter(adapter),
adapter, zfcp_data.adapters);
retval = qdio_free(adapter->ccw_device);
if (retval)
ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
zfcp_get_busid_by_adapter(adapter));
zfcp_free_low_mem_buffers(adapter);
/* free memory of adapter data structure and queues */
zfcp_qdio_free_queues(adapter);
zfcp_reqlist_free(adapter);
kfree(adapter->fc_stats);
kfree(adapter->stats_reset_data);
ZFCP_LOG_TRACE("freeing adapter structure\n");
kfree(adapter);
out:
return;
}
/**
* zfcp_port_enqueue - enqueue port to port list of adapter
* @adapter: adapter where remote port is added
* @wwpn: WWPN of the remote port to be enqueued
* @status: initial status for the port
* @d_id: destination id of the remote port to be enqueued
* Return: pointer to enqueued port on success, NULL on error
* Locks: config_sema must be held to serialize changes to the port list
*
* All port internal structures are set up and the sysfs entry is generated.
* d_id is used to enqueue ports with a well known address like the Directory
* Service for nameserver lookup.
*/
struct zfcp_port *
zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
u32 d_id)
{
struct zfcp_port *port;
int check_wwpn;
check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
/*
* check that there is no port with this WWPN already in list
*/
if (check_wwpn) {
read_lock_irq(&zfcp_data.config_lock);
port = zfcp_get_port_by_wwpn(adapter, wwpn);
read_unlock_irq(&zfcp_data.config_lock);
if (port)
return NULL;
}
port = kzalloc(sizeof (struct zfcp_port), GFP_KERNEL);
if (!port)
return NULL;
/* initialise reference count stuff */
atomic_set(&port->refcount, 0);
init_waitqueue_head(&port->remove_wq);
INIT_LIST_HEAD(&port->unit_list_head);
INIT_LIST_HEAD(&port->unit_remove_lh);
port->adapter = adapter;
if (check_wwpn)
port->wwpn = wwpn;
atomic_set_mask(status, &port->status);
/* setup for sysfs registration */
if (status & ZFCP_STATUS_PORT_WKA) {
switch (d_id) {
case ZFCP_DID_DIRECTORY_SERVICE:
snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
"directory");
break;
case ZFCP_DID_MANAGEMENT_SERVICE:
snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
"management");
break;
case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
"key_distribution");
break;
case ZFCP_DID_ALIAS_SERVICE:
snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
"alias");
break;
case ZFCP_DID_TIME_SERVICE:
snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
"time");
break;
default:
kfree(port);
return NULL;
}
port->d_id = d_id;
port->sysfs_device.parent = &adapter->generic_services;
} else {
snprintf(port->sysfs_device.bus_id,
BUS_ID_SIZE, "0x%016llx", wwpn);
port->sysfs_device.parent = &adapter->ccw_device->dev;
}
port->sysfs_device.release = zfcp_sysfs_port_release;
dev_set_drvdata(&port->sysfs_device, port);
/* mark port unusable as long as sysfs registration is not complete */
atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
if (device_register(&port->sysfs_device)) {
kfree(port);
return NULL;
}
if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
device_unregister(&port->sysfs_device);
return NULL;
}
zfcp_port_get(port);
write_lock_irq(&zfcp_data.config_lock);
list_add_tail(&port->list, &adapter->port_list_head);
atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
if (!adapter->nameserver_port)
adapter->nameserver_port = port;
adapter->ports++;
write_unlock_irq(&zfcp_data.config_lock);
zfcp_adapter_get(adapter);
return port;
}
void
zfcp_port_dequeue(struct zfcp_port *port)
{
zfcp_port_wait(port);
write_lock_irq(&zfcp_data.config_lock);
list_del(&port->list);
port->adapter->ports--;
write_unlock_irq(&zfcp_data.config_lock);
if (port->rport)
fc_remote_port_delete(port->rport);
port->rport = NULL;
zfcp_adapter_put(port->adapter);
zfcp_sysfs_port_remove_files(&port->sysfs_device,
atomic_read(&port->status));
device_unregister(&port->sysfs_device);
}
/* Enqueues a nameserver port */
int
zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
{
struct zfcp_port *port;
port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
ZFCP_DID_DIRECTORY_SERVICE);
if (!port) {
ZFCP_LOG_INFO("error: enqueue of nameserver port for "
"adapter %s failed\n",
zfcp_get_busid_by_adapter(adapter));
return -ENXIO;
}
zfcp_port_put(port);
return 0;
}
#undef ZFCP_LOG_AREA
/****************************************************************/
/******* Fibre Channel Standard related Functions **************/
/****************************************************************/
#define ZFCP_LOG_AREA ZFCP_LOG_AREA_FC
void
zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
struct fsf_status_read_buffer *status_buffer)
{
struct fcp_rscn_head *fcp_rscn_head;
struct fcp_rscn_element *fcp_rscn_element;
struct zfcp_port *port;
u16 i;
u16 no_entries;
u32 range_mask;
unsigned long flags;
fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
/* see FC-FS */
no_entries = (fcp_rscn_head->payload_len / 4);
for (i = 1; i < no_entries; i++) {
/* skip head and start with 1st element */
fcp_rscn_element++;
switch (fcp_rscn_element->addr_format) {
case ZFCP_PORT_ADDRESS:
range_mask = ZFCP_PORTS_RANGE_PORT;
break;
case ZFCP_AREA_ADDRESS:
range_mask = ZFCP_PORTS_RANGE_AREA;
break;
case ZFCP_DOMAIN_ADDRESS:
range_mask = ZFCP_PORTS_RANGE_DOMAIN;
break;
case ZFCP_FABRIC_ADDRESS:
range_mask = ZFCP_PORTS_RANGE_FABRIC;
break;
default:
ZFCP_LOG_INFO("incoming RSCN with unknown "
"address format\n");
continue;
}
read_lock_irqsave(&zfcp_data.config_lock, flags);
list_for_each_entry(port, &adapter->port_list_head, list) {
if (atomic_test_mask
(ZFCP_STATUS_PORT_WKA, &port->status))
continue;
/* Do we know this port? If not skip it. */
if (!atomic_test_mask
(ZFCP_STATUS_PORT_DID_DID, &port->status)) {
ZFCP_LOG_INFO("incoming RSCN, trying to open "
"port 0x%016Lx\n", port->wwpn);
zfcp_erp_port_reopen(port,
ZFCP_STATUS_COMMON_ERP_FAILED);
continue;
}
/*
* FIXME: race: d_id might being invalidated
* (...DID_DID reset)
*/
if ((port->d_id & range_mask)
== (fcp_rscn_element->nport_did & range_mask)) {
ZFCP_LOG_TRACE("reopen did 0x%08x\n",
fcp_rscn_element->nport_did);
/*
* Unfortunately, an RSCN does not specify the
* type of change a target underwent. We assume
* that it makes sense to reopen the link.
* FIXME: Shall we try to find out more about
* the target and link state before closing it?
* How to accomplish this? (nameserver?)
* Where would such code be put in?
* (inside or outside erp)
*/
ZFCP_LOG_INFO("incoming RSCN, trying to open "
"port 0x%016Lx\n", port->wwpn);
zfcp_test_link(port);
}
}
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
}
}
static void
zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
struct fsf_status_read_buffer *status_buffer)
{
struct fsf_plogi *els_plogi;
struct zfcp_port *port;
unsigned long flags;
els_plogi = (struct fsf_plogi *) status_buffer->payload;
read_lock_irqsave(&zfcp_data.config_lock, flags);
list_for_each_entry(port, &adapter->port_list_head, list) {
if (port->wwpn == (*(wwn_t *) &els_plogi->serv_param.wwpn))
break;
}
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
if (!port || (port->wwpn != (*(wwn_t *) &els_plogi->serv_param.wwpn))) {
ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
"with d_id 0x%08x on adapter %s\n",
status_buffer->d_id,
zfcp_get_busid_by_adapter(adapter));
} else {
zfcp_erp_port_forced_reopen(port, 0);
}
}
static void
zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
struct fsf_status_read_buffer *status_buffer)
{
struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
struct zfcp_port *port;
unsigned long flags;
read_lock_irqsave(&zfcp_data.config_lock, flags);
list_for_each_entry(port, &adapter->port_list_head, list) {
if (port->wwpn == els_logo->nport_wwpn)
break;
}
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
if (!port || (port->wwpn != els_logo->nport_wwpn)) {
ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
"with d_id 0x%08x on adapter %s\n",
status_buffer->d_id,
zfcp_get_busid_by_adapter(adapter));
} else {
zfcp_erp_port_forced_reopen(port, 0);
}
}
static void
zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
struct fsf_status_read_buffer *status_buffer)
{
ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
"for adapter %s\n", *(u32 *) (status_buffer->payload),
zfcp_get_busid_by_adapter(adapter));
}
void
zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
{
struct fsf_status_read_buffer *status_buffer;
u32 els_type;
struct zfcp_adapter *adapter;
status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
els_type = *(u32 *) (status_buffer->payload);
adapter = fsf_req->adapter;
zfcp_san_dbf_event_incoming_els(fsf_req);
if (els_type == LS_PLOGI)
zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
else if (els_type == LS_LOGO)
zfcp_fsf_incoming_els_logo(adapter, status_buffer);
else if ((els_type & 0xffff0000) == LS_RSCN)
/* we are only concerned with the command, not the length */
zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
else
zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
}
/**
* zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
* @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
* @pool: pointer to mempool_t if non-null memory pool is used for allocation
*/
static int
zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
{
struct zfcp_gid_pn_data *data;
if (pool != NULL) {
data = mempool_alloc(pool, GFP_ATOMIC);
if (likely(data != NULL)) {
data->ct.pool = pool;
}
} else {
data = kmalloc(sizeof(struct zfcp_gid_pn_data), GFP_ATOMIC);
}
if (NULL == data)
return -ENOMEM;
memset(data, 0, sizeof(*data));
data->ct.req = &data->req;
data->ct.resp = &data->resp;
data->ct.req_count = data->ct.resp_count = 1;
zfcp_address_to_sg(&data->ct_iu_req, &data->req);
zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
data->req.length = sizeof(struct ct_iu_gid_pn_req);
data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
*gid_pn = data;
return 0;
}
/**
* zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
* @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
*/
static void
zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
{
if ((gid_pn->ct.pool != 0))
mempool_free(gid_pn, gid_pn->ct.pool);
else
kfree(gid_pn);
return;
}
/**
* zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
* @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
*/
int
zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
{
int ret;
struct ct_iu_gid_pn_req *ct_iu_req;
struct zfcp_gid_pn_data *gid_pn;
struct zfcp_adapter *adapter = erp_action->adapter;
ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
if (ret < 0) {
ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
"request failed for adapter %s\n",
zfcp_get_busid_by_adapter(adapter));
goto out;
}
/* setup nameserver request */
ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
ct_iu_req->header.revision = ZFCP_CT_REVISION;
ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
ct_iu_req->wwpn = erp_action->port->wwpn;
/* setup parameters for send generic command */
gid_pn->ct.port = adapter->nameserver_port;
gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
gid_pn->ct.handler_data = (unsigned long) gid_pn;
gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
gid_pn->ct.timer = &erp_action->timer;
gid_pn->port = erp_action->port;
ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
erp_action);
if (ret) {
ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
"failed for adapter %s\n",
zfcp_get_busid_by_adapter(adapter));
zfcp_gid_pn_buffers_free(gid_pn);
}
out:
return ret;
}
/**
* zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
* @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
*/
static void zfcp_ns_gid_pn_handler(unsigned long data)
{
struct zfcp_port *port;
struct zfcp_send_ct *ct;
struct ct_iu_gid_pn_req *ct_iu_req;
struct ct_iu_gid_pn_resp *ct_iu_resp;
struct zfcp_gid_pn_data *gid_pn;
gid_pn = (struct zfcp_gid_pn_data *) data;
port = gid_pn->port;
ct = &gid_pn->ct;
ct_iu_req = zfcp_sg_to_address(ct->req);
ct_iu_resp = zfcp_sg_to_address(ct->resp);
if (ct->status != 0)
goto failed;
if (zfcp_check_ct_response(&ct_iu_resp->header)) {
/* FIXME: do we need some specific erp entry points */
atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
goto failed;
}
/* paranoia */
if (ct_iu_req->wwpn != port->wwpn) {
ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
"lookup does not match expected wwpn 0x%016Lx "
"for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
zfcp_get_busid_by_port(port));
goto mismatch;
}
/* looks like a valid d_id */
port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
ZFCP_LOG_DEBUG("adapter %s: wwpn=0x%016Lx ---> d_id=0x%08x\n",
zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
goto out;
mismatch:
ZFCP_LOG_DEBUG("CT IUs do not match:\n");
ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
sizeof(struct ct_iu_gid_pn_req));
ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
sizeof(struct ct_iu_gid_pn_resp));
failed:
ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
"0x%016Lx for adapter %s\n",
port->wwpn, zfcp_get_busid_by_port(port));
out:
zfcp_gid_pn_buffers_free(gid_pn);
return;
}
/* reject CT_IU reason codes acc. to FC-GS-4 */
static const struct zfcp_rc_entry zfcp_ct_rc[] = {
{0x01, "invalid command code"},
{0x02, "invalid version level"},
{0x03, "logical error"},
{0x04, "invalid CT_IU size"},
{0x05, "logical busy"},
{0x07, "protocol error"},
{0x09, "unable to perform command request"},
{0x0b, "command not supported"},
{0x0d, "server not available"},
{0x0e, "session could not be established"},
{0xff, "vendor specific error"},
{0, NULL},
};
/* LS_RJT reason codes acc. to FC-FS */
static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
{0x01, "invalid LS_Command code"},
{0x03, "logical error"},
{0x05, "logical busy"},
{0x07, "protocol error"},
{0x09, "unable to perform command request"},
{0x0b, "command not supported"},
{0x0e, "command already in progress"},
{0xff, "vendor specific error"},
{0, NULL},
};
/* reject reason codes according to FC-PH/FC-FS */
static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
{0x01, "invalid D_ID"},
{0x02, "invalid S_ID"},
{0x03, "Nx_Port not available, temporary"},
{0x04, "Nx_Port not available, permament"},
{0x05, "class not supported"},
{0x06, "delimiter usage error"},
{0x07, "TYPE not supported"},
{0x08, "invalid Link_Control"},
{0x09, "invalid R_CTL field"},
{0x0a, "invalid F_CTL field"},
{0x0b, "invalid OX_ID"},
{0x0c, "invalid RX_ID"},
{0x0d, "invalid SEQ_ID"},
{0x0e, "invalid DF_CTL"},
{0x0f, "invalid SEQ_CNT"},
{0x10, "invalid parameter field"},
{0x11, "exchange error"},
{0x12, "protocol error"},
{0x13, "incorrect length"},
{0x14, "unsupported ACK"},
{0x15, "class of service not supported by entity at FFFFFE"},
{0x16, "login required"},
{0x17, "excessive sequences attempted"},
{0x18, "unable to establish exchange"},
{0x1a, "fabric path not available"},
{0x1b, "invalid VC_ID (class 4)"},
{0x1c, "invalid CS_CTL field"},
{0x1d, "insufficient resources for VC (class 4)"},
{0x1f, "invalid class of service"},
{0x20, "preemption request rejected"},
{0x21, "preemption not enabled"},
{0x22, "multicast error"},
{0x23, "multicast error terminate"},
{0x24, "process login required"},
{0xff, "vendor specific reject"},
{0, NULL},
};
/**
* zfcp_rc_description - return description for given reaon code
* @code: reason code
* @rc_table: table of reason codes and descriptions
*/
static inline const char *
zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
{
const char *descr = "unknown reason code";
do {
if (code == rc_table->code) {
descr = rc_table->description;
break;
}
rc_table++;
} while (rc_table->code && rc_table->description);
return descr;
}
/**
* zfcp_check_ct_response - evaluate reason code for CT_IU
* @rjt: response payload to an CT_IU request
* Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
*/
int
zfcp_check_ct_response(struct ct_hdr *rjt)
{
if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
return 0;
if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
"response code (0x%04hx)\n",
rjt->cmd_rsp_code);
return 1;
}
ZFCP_LOG_INFO("Generic Service command rejected\n");
ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
(u32) rjt->reason_code, (u32) rjt->reason_code_expl,
(u32) rjt->vendor_unique);
return 1;
}
/**
* zfcp_print_els_rjt - print reject parameter and description for ELS reject
* @rjt_par: reject parameter acc. to FC-PH/FC-FS
* @rc_table: table of reason codes and descriptions
*/
static inline void
zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
const struct zfcp_rc_entry *rc_table)
{
ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
zfcp_rc_description(rjt_par->reason_code, rc_table),
(u32) rjt_par->action, (u32) rjt_par->reason_code,
(u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
}
/**
* zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
* @sq: status qualifier word
* @rjt_par: reject parameter as described in FC-PH and FC-FS
* Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
*/
int
zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
{
int ret = -EIO;
if (sq == FSF_IOSTAT_NPORT_RJT) {
ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
/* invalid d_id */
if (rjt_par->reason_code == 0x01)
ret = -EREMCHG;
} else if (sq == FSF_IOSTAT_FABRIC_RJT) {
ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
/* invalid d_id */
if (rjt_par->reason_code == 0x01)
ret = -EREMCHG;
} else if (sq == FSF_IOSTAT_LS_RJT) {
ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
ret = -EREMOTEIO;
} else
ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
return ret;
}
/**
* zfcp_plogi_evaluate - evaluate PLOGI playload and copy important fields
* into zfcp_port structure
* @port: zfcp_port structure
* @plogi: plogi payload
*/
void
zfcp_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
{
port->maxframe_size = plogi->serv_param.common_serv_param[7] |
((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
if (plogi->serv_param.class1_serv_param[0] & 0x80)
port->supported_classes |= FC_COS_CLASS1;
if (plogi->serv_param.class2_serv_param[0] & 0x80)
port->supported_classes |= FC_COS_CLASS2;
if (plogi->serv_param.class3_serv_param[0] & 0x80)
port->supported_classes |= FC_COS_CLASS3;
if (plogi->serv_param.class4_serv_param[0] & 0x80)
port->supported_classes |= FC_COS_CLASS4;
}
#undef ZFCP_LOG_AREA
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