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b76becde2b
linux/drivers/s390/scsi/zfcp_fsf.c
Benjamin Block b76becde2b scsi: zfcp: fix request object use-after-free in send path causing seqno errors 
With a recent change to our send path for FSF commands we introduced a
possible use-after-free of request-objects, that might further lead to
zfcp crafting bad requests, which the FCP channel correctly complains
about with an error (FSF_PROT_SEQ_NUMB_ERROR). This error is then handled
by an adapter-wide recovery.

The following sequence illustrates the possible use-after-free:

    Send Path:

        int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
        {
                struct zfcp_fsf_req *req;
                ...
                spin_lock_irq(&qdio->req_q_lock);
        //                     ^^^^^^^^^^^^^^^^
        //                     protects QDIO queue during sending
                ...
                req = zfcp_fsf_req_create(qdio,
                                          FSF_QTCB_OPEN_PORT_WITH_DID,
                                          SBAL_SFLAGS0_TYPE_READ,
                                          qdio->adapter->pool.erp_req);
        //            ^^^^^^^^^^^^^^^^^^^
        //            allocation of the request-object
                ...
                retval = zfcp_fsf_req_send(req);
                ...
                spin_unlock_irq(&qdio->req_q_lock);
                return retval;
        }

        static int zfcp_fsf_req_send(struct zfcp_fsf_req *req)
        {
                struct zfcp_adapter *adapter = req->adapter;
                struct zfcp_qdio *qdio = adapter->qdio;
                ...
                zfcp_reqlist_add(adapter->req_list, req);
        //      ^^^^^^^^^^^^^^^^
        //      add request to our driver-internal hash-table for tracking
        //      (protected by separate lock req_list->lock)
                ...
                if (zfcp_qdio_send(qdio, &req->qdio_req)) {
        //          ^^^^^^^^^^^^^^
        //          hand-off the request to FCP channel;
        //          the request can complete at any point now
                        ...
                }

                /* Don't increase for unsolicited status */
                if (!zfcp_fsf_req_is_status_read_buffer(req))
        //           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        //           possible use-after-free
                        adapter->fsf_req_seq_no++;
        //                       ^^^^^^^^^^^^^^^^
        //                       because of the use-after-free we might
        //                       miss this accounting, and as follow-up
        //                       this results in the FCP channel error
        //                       FSF_PROT_SEQ_NUMB_ERROR
                adapter->req_no++;

                return 0;
        }

        static inline bool
        zfcp_fsf_req_is_status_read_buffer(struct zfcp_fsf_req *req)
        {
                return req->qtcb == NULL;
        //             ^^^^^^^^^
        //             possible use-after-free
        }

    Response Path:

        void zfcp_fsf_reqid_check(struct zfcp_qdio *qdio, int sbal_idx)
        {
                ...
                struct zfcp_fsf_req *fsf_req;
                ...
                for (idx = 0; idx < QDIO_MAX_ELEMENTS_PER_BUFFER; idx++) {
                        ...
                        fsf_req = zfcp_reqlist_find_rm(adapter->req_list,
                                                       req_id);
        //                        ^^^^^^^^^^^^^^^^^^^^
        //                        remove request from our driver-internal
        //                        hash-table (lock req_list->lock)
                        ...
                        zfcp_fsf_req_complete(fsf_req);
                }
        }

        static void zfcp_fsf_req_complete(struct zfcp_fsf_req *req)
        {
                ...
                if (likely(req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
                        zfcp_fsf_req_free(req);
        //              ^^^^^^^^^^^^^^^^^
        //              free memory for request-object
                else
                        complete(&req->completion);
        //              ^^^^^^^^
        //              completion notification for code-paths that wait
        //              synchronous for the completion of the request; in
        //              those the memory is freed separately
        }

The result of the use-after-free only affects the send path, and can not
lead to any data corruption. In case we miss the sequence-number
accounting, because the memory was already re-purposed, the next FSF
command will fail with said FCP channel error, and we will recover the
whole adapter. This causes no additional errors, but it slows down
traffic.  There is a slight chance of the same thing happen again
recursively after the adapter recovery, but so far this has not been seen.

This was seen under z/VM, where the send path might run on a virtual CPU
that gets scheduled away by z/VM, while the return path might still run,
and so create the necessary timing. Running with KASAN can also slow down
the kernel sufficiently to run into this user-after-free, and then see the
report by KASAN.

To fix this, simply pull the test for the sequence-number accounting in
front of the hand-off to the FCP channel (this information doesn't change
during hand-off), but leave the sequence-number accounting itself where it
is.

To make future regressions of the same kind less likely, add comments to
all closely related code-paths.

Signed-off-by: Benjamin Block <bblock@linux.ibm.com>
Fixes: f9eca02276 ("scsi: zfcp: drop duplicate fsf_command from zfcp_fsf_req which is also in QTCB header")
Cc: <stable@vger.kernel.org> #5.0+
Reviewed-by: Steffen Maier <maier@linux.ibm.com>
Reviewed-by: Jens Remus <jremus@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-07-11 21:04:22 -04:00

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// SPDX-License-Identifier: GPL-2.0
/*
* zfcp device driver
*
* Implementation of FSF commands.
*
* Copyright IBM Corp. 2002, 2018
*/
#define KMSG_COMPONENT "zfcp"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/blktrace_api.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <scsi/fc/fc_els.h>
#include "zfcp_ext.h"
#include "zfcp_fc.h"
#include "zfcp_dbf.h"
#include "zfcp_qdio.h"
#include "zfcp_reqlist.h"
/* timeout for FSF requests sent during scsi_eh: abort or FCP TMF */
#define ZFCP_FSF_SCSI_ER_TIMEOUT (10*HZ)
/* timeout for: exchange config/port data outside ERP, or open/close WKA port */
#define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ)
struct kmem_cache *zfcp_fsf_qtcb_cache;
static void zfcp_fsf_request_timeout_handler(struct timer_list *t)
{
struct zfcp_fsf_req *fsf_req = from_timer(fsf_req, t, timer);
struct zfcp_adapter *adapter = fsf_req->adapter;
zfcp_qdio_siosl(adapter);
zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
"fsrth_1");
}
static void zfcp_fsf_start_timer(struct zfcp_fsf_req *fsf_req,
unsigned long timeout)
{
fsf_req->timer.function = zfcp_fsf_request_timeout_handler;
fsf_req->timer.expires = jiffies + timeout;
add_timer(&fsf_req->timer);
}
static void zfcp_fsf_start_erp_timer(struct zfcp_fsf_req *fsf_req)
{
BUG_ON(!fsf_req->erp_action);
fsf_req->timer.function = zfcp_erp_timeout_handler;
fsf_req->timer.expires = jiffies + 30 * HZ;
add_timer(&fsf_req->timer);
}
/* association between FSF command and FSF QTCB type */
static u32 fsf_qtcb_type[] = {
[FSF_QTCB_FCP_CMND] = FSF_IO_COMMAND,
[FSF_QTCB_ABORT_FCP_CMND] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_OPEN_PORT_WITH_DID] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_OPEN_LUN] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_CLOSE_LUN] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_CLOSE_PORT] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_CLOSE_PHYSICAL_PORT] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_SEND_ELS] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_SEND_GENERIC] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_EXCHANGE_CONFIG_DATA] = FSF_CONFIG_COMMAND,
[FSF_QTCB_EXCHANGE_PORT_DATA] = FSF_PORT_COMMAND,
[FSF_QTCB_DOWNLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_UPLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND
};
static void zfcp_fsf_class_not_supp(struct zfcp_fsf_req *req)
{
dev_err(&req->adapter->ccw_device->dev, "FCP device not "
"operational because of an unsupported FC class\n");
zfcp_erp_adapter_shutdown(req->adapter, 0, "fscns_1");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
}
/**
* zfcp_fsf_req_free - free memory used by fsf request
* @req: pointer to struct zfcp_fsf_req
*/
void zfcp_fsf_req_free(struct zfcp_fsf_req *req)
{
if (likely(req->pool)) {
if (likely(!zfcp_fsf_req_is_status_read_buffer(req)))
mempool_free(req->qtcb, req->adapter->pool.qtcb_pool);
mempool_free(req, req->pool);
return;
}
if (likely(!zfcp_fsf_req_is_status_read_buffer(req)))
kmem_cache_free(zfcp_fsf_qtcb_cache, req->qtcb);
kfree(req);
}
static void zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *req)
{
unsigned long flags;
struct fsf_status_read_buffer *sr_buf = req->data;
struct zfcp_adapter *adapter = req->adapter;
struct zfcp_port *port;
int d_id = ntoh24(sr_buf->d_id);
read_lock_irqsave(&adapter->port_list_lock, flags);
list_for_each_entry(port, &adapter->port_list, list)
if (port->d_id == d_id) {
zfcp_erp_port_reopen(port, 0, "fssrpc1");
break;
}
read_unlock_irqrestore(&adapter->port_list_lock, flags);
}
static void zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *req,
struct fsf_link_down_info *link_down)
{
struct zfcp_adapter *adapter = req->adapter;
if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
return;
atomic_or(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
zfcp_scsi_schedule_rports_block(adapter);
if (!link_down)
goto out;
switch (link_down->error_code) {
case FSF_PSQ_LINK_NO_LIGHT:
dev_warn(&req->adapter->ccw_device->dev,
"There is no light signal from the local "
"fibre channel cable\n");
break;
case FSF_PSQ_LINK_WRAP_PLUG:
dev_warn(&req->adapter->ccw_device->dev,
"There is a wrap plug instead of a fibre "
"channel cable\n");
break;
case FSF_PSQ_LINK_NO_FCP:
dev_warn(&req->adapter->ccw_device->dev,
"The adjacent fibre channel node does not "
"support FCP\n");
break;
case FSF_PSQ_LINK_FIRMWARE_UPDATE:
dev_warn(&req->adapter->ccw_device->dev,
"The FCP device is suspended because of a "
"firmware update\n");
break;
case FSF_PSQ_LINK_INVALID_WWPN:
dev_warn(&req->adapter->ccw_device->dev,
"The FCP device detected a WWPN that is "
"duplicate or not valid\n");
break;
case FSF_PSQ_LINK_NO_NPIV_SUPPORT:
dev_warn(&req->adapter->ccw_device->dev,
"The fibre channel fabric does not support NPIV\n");
break;
case FSF_PSQ_LINK_NO_FCP_RESOURCES:
dev_warn(&req->adapter->ccw_device->dev,
"The FCP adapter cannot support more NPIV ports\n");
break;
case FSF_PSQ_LINK_NO_FABRIC_RESOURCES:
dev_warn(&req->adapter->ccw_device->dev,
"The adjacent switch cannot support "
"more NPIV ports\n");
break;
case FSF_PSQ_LINK_FABRIC_LOGIN_UNABLE:
dev_warn(&req->adapter->ccw_device->dev,
"The FCP adapter could not log in to the "
"fibre channel fabric\n");
break;
case FSF_PSQ_LINK_WWPN_ASSIGNMENT_CORRUPTED:
dev_warn(&req->adapter->ccw_device->dev,
"The WWPN assignment file on the FCP adapter "
"has been damaged\n");
break;
case FSF_PSQ_LINK_MODE_TABLE_CURRUPTED:
dev_warn(&req->adapter->ccw_device->dev,
"The mode table on the FCP adapter "
"has been damaged\n");
break;
case FSF_PSQ_LINK_NO_WWPN_ASSIGNMENT:
dev_warn(&req->adapter->ccw_device->dev,
"All NPIV ports on the FCP adapter have "
"been assigned\n");
break;
default:
dev_warn(&req->adapter->ccw_device->dev,
"The link between the FCP adapter and "
"the FC fabric is down\n");
}
out:
zfcp_erp_set_adapter_status(adapter, ZFCP_STATUS_COMMON_ERP_FAILED);
}
static void zfcp_fsf_status_read_link_down(struct zfcp_fsf_req *req)
{
struct fsf_status_read_buffer *sr_buf = req->data;
struct fsf_link_down_info *ldi =
(struct fsf_link_down_info *) &sr_buf->payload;
switch (sr_buf->status_subtype) {
case FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK:
case FSF_STATUS_READ_SUB_FDISC_FAILED:
zfcp_fsf_link_down_info_eval(req, ldi);
break;
case FSF_STATUS_READ_SUB_FIRMWARE_UPDATE:
zfcp_fsf_link_down_info_eval(req, NULL);
}
}
static void zfcp_fsf_status_read_handler(struct zfcp_fsf_req *req)
{
struct zfcp_adapter *adapter = req->adapter;
struct fsf_status_read_buffer *sr_buf = req->data;
if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
zfcp_dbf_hba_fsf_uss("fssrh_1", req);
mempool_free(virt_to_page(sr_buf), adapter->pool.sr_data);
zfcp_fsf_req_free(req);
return;
}
zfcp_dbf_hba_fsf_uss("fssrh_4", req);
switch (sr_buf->status_type) {
case FSF_STATUS_READ_PORT_CLOSED:
zfcp_fsf_status_read_port_closed(req);
break;
case FSF_STATUS_READ_INCOMING_ELS:
zfcp_fc_incoming_els(req);
break;
case FSF_STATUS_READ_SENSE_DATA_AVAIL:
break;
case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
dev_warn(&adapter->ccw_device->dev,
"The error threshold for checksum statistics "
"has been exceeded\n");
zfcp_dbf_hba_bit_err("fssrh_3", req);
break;
case FSF_STATUS_READ_LINK_DOWN:
zfcp_fsf_status_read_link_down(req);
zfcp_fc_enqueue_event(adapter, FCH_EVT_LINKDOWN, 0);
break;
case FSF_STATUS_READ_LINK_UP:
dev_info(&adapter->ccw_device->dev,
"The local link has been restored\n");
/* All ports should be marked as ready to run again */
zfcp_erp_set_adapter_status(adapter,
ZFCP_STATUS_COMMON_RUNNING);
zfcp_erp_adapter_reopen(adapter,
ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
ZFCP_STATUS_COMMON_ERP_FAILED,
"fssrh_2");
zfcp_fc_enqueue_event(adapter, FCH_EVT_LINKUP, 0);
break;
case FSF_STATUS_READ_NOTIFICATION_LOST:
if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_INCOMING_ELS)
zfcp_fc_conditional_port_scan(adapter);
break;
case FSF_STATUS_READ_FEATURE_UPDATE_ALERT:
adapter->adapter_features = sr_buf->payload.word[0];
break;
}
mempool_free(virt_to_page(sr_buf), adapter->pool.sr_data);
zfcp_fsf_req_free(req);
atomic_inc(&adapter->stat_miss);
queue_work(adapter->work_queue, &adapter->stat_work);
}
static void zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *req)
{
switch (req->qtcb->header.fsf_status_qual.word[0]) {
case FSF_SQ_FCP_RSP_AVAILABLE:
case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
case FSF_SQ_NO_RETRY_POSSIBLE:
case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
return;
case FSF_SQ_COMMAND_ABORTED:
break;
case FSF_SQ_NO_RECOM:
dev_err(&req->adapter->ccw_device->dev,
"The FCP adapter reported a problem "
"that cannot be recovered\n");
zfcp_qdio_siosl(req->adapter);
zfcp_erp_adapter_shutdown(req->adapter, 0, "fsfsqe1");
break;
}
/* all non-return stats set FSFREQ_ERROR*/
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
}
static void zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *req)
{
if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
return;
switch (req->qtcb->header.fsf_status) {
case FSF_UNKNOWN_COMMAND:
dev_err(&req->adapter->ccw_device->dev,
"The FCP adapter does not recognize the command 0x%x\n",
req->qtcb->header.fsf_command);
zfcp_erp_adapter_shutdown(req->adapter, 0, "fsfse_1");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
zfcp_fsf_fsfstatus_qual_eval(req);
break;
}
}
static void zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *req)
{
struct zfcp_adapter *adapter = req->adapter;
struct fsf_qtcb *qtcb = req->qtcb;
union fsf_prot_status_qual *psq = &qtcb->prefix.prot_status_qual;
zfcp_dbf_hba_fsf_response(req);
if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
return;
}
switch (qtcb->prefix.prot_status) {
case FSF_PROT_GOOD:
case FSF_PROT_FSF_STATUS_PRESENTED:
return;
case FSF_PROT_QTCB_VERSION_ERROR:
dev_err(&adapter->ccw_device->dev,
"QTCB version 0x%x not supported by FCP adapter "
"(0x%x to 0x%x)\n", FSF_QTCB_CURRENT_VERSION,
psq->word[0], psq->word[1]);
zfcp_erp_adapter_shutdown(adapter, 0, "fspse_1");
break;
case FSF_PROT_ERROR_STATE:
case FSF_PROT_SEQ_NUMB_ERROR:
zfcp_erp_adapter_reopen(adapter, 0, "fspse_2");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_PROT_UNSUPP_QTCB_TYPE:
dev_err(&adapter->ccw_device->dev,
"The QTCB type is not supported by the FCP adapter\n");
zfcp_erp_adapter_shutdown(adapter, 0, "fspse_3");
break;
case FSF_PROT_HOST_CONNECTION_INITIALIZING:
atomic_or(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
&adapter->status);
break;
case FSF_PROT_DUPLICATE_REQUEST_ID:
dev_err(&adapter->ccw_device->dev,
"0x%Lx is an ambiguous request identifier\n",
(unsigned long long)qtcb->bottom.support.req_handle);
zfcp_erp_adapter_shutdown(adapter, 0, "fspse_4");
break;
case FSF_PROT_LINK_DOWN:
zfcp_fsf_link_down_info_eval(req, &psq->link_down_info);
/* go through reopen to flush pending requests */
zfcp_erp_adapter_reopen(adapter, 0, "fspse_6");
break;
case FSF_PROT_REEST_QUEUE:
/* All ports should be marked as ready to run again */
zfcp_erp_set_adapter_status(adapter,
ZFCP_STATUS_COMMON_RUNNING);
zfcp_erp_adapter_reopen(adapter,
ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
ZFCP_STATUS_COMMON_ERP_FAILED,
"fspse_8");
break;
default:
dev_err(&adapter->ccw_device->dev,
"0x%x is not a valid transfer protocol status\n",
qtcb->prefix.prot_status);
zfcp_qdio_siosl(adapter);
zfcp_erp_adapter_shutdown(adapter, 0, "fspse_9");
}
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
}
/**
* zfcp_fsf_req_complete - process completion of a FSF request
* @req: The FSF request that has been completed.
*
* When a request has been completed either from the FCP adapter,
* or it has been dismissed due to a queue shutdown, this function
* is called to process the completion status and trigger further
* events related to the FSF request.
*/
static void zfcp_fsf_req_complete(struct zfcp_fsf_req *req)
{
if (unlikely(zfcp_fsf_req_is_status_read_buffer(req))) {
zfcp_fsf_status_read_handler(req);
return;
}
del_timer(&req->timer);
zfcp_fsf_protstatus_eval(req);
zfcp_fsf_fsfstatus_eval(req);
req->handler(req);
if (req->erp_action)
zfcp_erp_notify(req->erp_action, 0);
if (likely(req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
zfcp_fsf_req_free(req);
else
complete(&req->completion);
}
/**
* zfcp_fsf_req_dismiss_all - dismiss all fsf requests
* @adapter: pointer to struct zfcp_adapter
*
* Never ever call this without shutting down the adapter first.
* Otherwise the adapter would continue using and corrupting s390 storage.
* Included BUG_ON() call to ensure this is done.
* ERP is supposed to be the only user of this function.
*/
void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter)
{
struct zfcp_fsf_req *req, *tmp;
LIST_HEAD(remove_queue);
BUG_ON(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP);
zfcp_reqlist_move(adapter->req_list, &remove_queue);
list_for_each_entry_safe(req, tmp, &remove_queue, list) {
list_del(&req->list);
req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
zfcp_fsf_req_complete(req);
}
}
#define ZFCP_FSF_PORTSPEED_1GBIT (1 << 0)
#define ZFCP_FSF_PORTSPEED_2GBIT (1 << 1)
#define ZFCP_FSF_PORTSPEED_4GBIT (1 << 2)
#define ZFCP_FSF_PORTSPEED_10GBIT (1 << 3)
#define ZFCP_FSF_PORTSPEED_8GBIT (1 << 4)
#define ZFCP_FSF_PORTSPEED_16GBIT (1 << 5)
#define ZFCP_FSF_PORTSPEED_32GBIT (1 << 6)
#define ZFCP_FSF_PORTSPEED_64GBIT (1 << 7)
#define ZFCP_FSF_PORTSPEED_128GBIT (1 << 8)
#define ZFCP_FSF_PORTSPEED_NOT_NEGOTIATED (1 << 15)
static u32 zfcp_fsf_convert_portspeed(u32 fsf_speed)
{
u32 fdmi_speed = 0;
if (fsf_speed & ZFCP_FSF_PORTSPEED_1GBIT)
fdmi_speed |= FC_PORTSPEED_1GBIT;
if (fsf_speed & ZFCP_FSF_PORTSPEED_2GBIT)
fdmi_speed |= FC_PORTSPEED_2GBIT;
if (fsf_speed & ZFCP_FSF_PORTSPEED_4GBIT)
fdmi_speed |= FC_PORTSPEED_4GBIT;
if (fsf_speed & ZFCP_FSF_PORTSPEED_10GBIT)
fdmi_speed |= FC_PORTSPEED_10GBIT;
if (fsf_speed & ZFCP_FSF_PORTSPEED_8GBIT)
fdmi_speed |= FC_PORTSPEED_8GBIT;
if (fsf_speed & ZFCP_FSF_PORTSPEED_16GBIT)
fdmi_speed |= FC_PORTSPEED_16GBIT;
if (fsf_speed & ZFCP_FSF_PORTSPEED_32GBIT)
fdmi_speed |= FC_PORTSPEED_32GBIT;
if (fsf_speed & ZFCP_FSF_PORTSPEED_64GBIT)
fdmi_speed |= FC_PORTSPEED_64GBIT;
if (fsf_speed & ZFCP_FSF_PORTSPEED_128GBIT)
fdmi_speed |= FC_PORTSPEED_128GBIT;
if (fsf_speed & ZFCP_FSF_PORTSPEED_NOT_NEGOTIATED)
fdmi_speed |= FC_PORTSPEED_NOT_NEGOTIATED;
return fdmi_speed;
}
static int zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *req)
{
struct fsf_qtcb_bottom_config *bottom = &req->qtcb->bottom.config;
struct zfcp_adapter *adapter = req->adapter;
struct Scsi_Host *shost = adapter->scsi_host;
struct fc_els_flogi *nsp, *plogi;
/* adjust pointers for missing command code */
nsp = (struct fc_els_flogi *) ((u8 *)&bottom->nport_serv_param
- sizeof(u32));
plogi = (struct fc_els_flogi *) ((u8 *)&bottom->plogi_payload
- sizeof(u32));
if (req->data)
memcpy(req->data, bottom, sizeof(*bottom));
fc_host_port_name(shost) = be64_to_cpu(nsp->fl_wwpn);
fc_host_node_name(shost) = be64_to_cpu(nsp->fl_wwnn);
fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3;
adapter->timer_ticks = bottom->timer_interval & ZFCP_FSF_TIMER_INT_MASK;
adapter->stat_read_buf_num = max(bottom->status_read_buf_num,
(u16)FSF_STATUS_READS_RECOM);
if (fc_host_permanent_port_name(shost) == -1)
fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
zfcp_scsi_set_prot(adapter);
/* no error return above here, otherwise must fix call chains */
/* do not evaluate invalid fields */
if (req->qtcb->header.fsf_status == FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE)
return 0;
fc_host_port_id(shost) = ntoh24(bottom->s_id);
fc_host_speed(shost) =
zfcp_fsf_convert_portspeed(bottom->fc_link_speed);
adapter->hydra_version = bottom->adapter_type;
switch (bottom->fc_topology) {
case FSF_TOPO_P2P:
adapter->peer_d_id = ntoh24(bottom->peer_d_id);
adapter->peer_wwpn = be64_to_cpu(plogi->fl_wwpn);
adapter->peer_wwnn = be64_to_cpu(plogi->fl_wwnn);
fc_host_port_type(shost) = FC_PORTTYPE_PTP;
break;
case FSF_TOPO_FABRIC:
if (bottom->connection_features & FSF_FEATURE_NPIV_MODE)
fc_host_port_type(shost) = FC_PORTTYPE_NPIV;
else
fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
break;
case FSF_TOPO_AL:
fc_host_port_type(shost) = FC_PORTTYPE_NLPORT;
/* fall through */
default:
dev_err(&adapter->ccw_device->dev,
"Unknown or unsupported arbitrated loop "
"fibre channel topology detected\n");
zfcp_erp_adapter_shutdown(adapter, 0, "fsece_1");
return -EIO;
}
return 0;
}
static void zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *req)
{
struct zfcp_adapter *adapter = req->adapter;
struct fsf_qtcb *qtcb = req->qtcb;
struct fsf_qtcb_bottom_config *bottom = &qtcb->bottom.config;
struct Scsi_Host *shost = adapter->scsi_host;
if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
return;
adapter->fsf_lic_version = bottom->lic_version;
adapter->adapter_features = bottom->adapter_features;
adapter->connection_features = bottom->connection_features;
adapter->peer_wwpn = 0;
adapter->peer_wwnn = 0;
adapter->peer_d_id = 0;
switch (qtcb->header.fsf_status) {
case FSF_GOOD:
if (zfcp_fsf_exchange_config_evaluate(req))
return;
if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
dev_err(&adapter->ccw_device->dev,
"FCP adapter maximum QTCB size (%d bytes) "
"is too small\n",
bottom->max_qtcb_size);
zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh1");
return;
}
atomic_or(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
&adapter->status);
break;
case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
fc_host_node_name(shost) = 0;
fc_host_port_name(shost) = 0;
fc_host_port_id(shost) = 0;
fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
adapter->hydra_version = 0;
/* avoids adapter shutdown to be able to recognize
* events such as LINK UP */
atomic_or(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
&adapter->status);
zfcp_fsf_link_down_info_eval(req,
&qtcb->header.fsf_status_qual.link_down_info);
if (zfcp_fsf_exchange_config_evaluate(req))
return;
break;
default:
zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh3");
return;
}
if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
adapter->hardware_version = bottom->hardware_version;
memcpy(fc_host_serial_number(shost), bottom->serial_number,
min(FC_SERIAL_NUMBER_SIZE, 17));
EBCASC(fc_host_serial_number(shost),
min(FC_SERIAL_NUMBER_SIZE, 17));
}
if (FSF_QTCB_CURRENT_VERSION < bottom->low_qtcb_version) {
dev_err(&adapter->ccw_device->dev,
"The FCP adapter only supports newer "
"control block versions\n");
zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh4");
return;
}
if (FSF_QTCB_CURRENT_VERSION > bottom->high_qtcb_version) {
dev_err(&adapter->ccw_device->dev,
"The FCP adapter only supports older "
"control block versions\n");
zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh5");
}
}
static void zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *req)
{
struct zfcp_adapter *adapter = req->adapter;
struct fsf_qtcb_bottom_port *bottom = &req->qtcb->bottom.port;
struct Scsi_Host *shost = adapter->scsi_host;
if (req->data)
memcpy(req->data, bottom, sizeof(*bottom));
if (adapter->connection_features & FSF_FEATURE_NPIV_MODE) {
fc_host_permanent_port_name(shost) = bottom->wwpn;
} else
fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
fc_host_supported_speeds(shost) =
zfcp_fsf_convert_portspeed(bottom->supported_speed);
memcpy(fc_host_supported_fc4s(shost), bottom->supported_fc4_types,
FC_FC4_LIST_SIZE);
memcpy(fc_host_active_fc4s(shost), bottom->active_fc4_types,
FC_FC4_LIST_SIZE);
}
static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *req)
{
struct fsf_qtcb *qtcb = req->qtcb;
if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
return;
switch (qtcb->header.fsf_status) {
case FSF_GOOD:
zfcp_fsf_exchange_port_evaluate(req);
break;
case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
zfcp_fsf_exchange_port_evaluate(req);
zfcp_fsf_link_down_info_eval(req,
&qtcb->header.fsf_status_qual.link_down_info);
break;
}
}
static struct zfcp_fsf_req *zfcp_fsf_alloc(mempool_t *pool)
{
struct zfcp_fsf_req *req;
if (likely(pool))
req = mempool_alloc(pool, GFP_ATOMIC);
else
req = kmalloc(sizeof(*req), GFP_ATOMIC);
if (unlikely(!req))
return NULL;
memset(req, 0, sizeof(*req));
req->pool = pool;
return req;
}
static struct fsf_qtcb *zfcp_fsf_qtcb_alloc(mempool_t *pool)
{
struct fsf_qtcb *qtcb;
if (likely(pool))
qtcb = mempool_alloc(pool, GFP_ATOMIC);
else
qtcb = kmem_cache_alloc(zfcp_fsf_qtcb_cache, GFP_ATOMIC);
if (unlikely(!qtcb))
return NULL;
memset(qtcb, 0, sizeof(*qtcb));
return qtcb;
}
static struct zfcp_fsf_req *zfcp_fsf_req_create(struct zfcp_qdio *qdio,
u32 fsf_cmd, u8 sbtype,
mempool_t *pool)
{
struct zfcp_adapter *adapter = qdio->adapter;
struct zfcp_fsf_req *req = zfcp_fsf_alloc(pool);
if (unlikely(!req))
return ERR_PTR(-ENOMEM);
if (adapter->req_no == 0)
adapter->req_no++;
INIT_LIST_HEAD(&req->list);
timer_setup(&req->timer, NULL, 0);
init_completion(&req->completion);
req->adapter = adapter;
req->req_id = adapter->req_no;
if (likely(fsf_cmd != FSF_QTCB_UNSOLICITED_STATUS)) {
if (likely(pool))
req->qtcb = zfcp_fsf_qtcb_alloc(
adapter->pool.qtcb_pool);
else
req->qtcb = zfcp_fsf_qtcb_alloc(NULL);
if (unlikely(!req->qtcb)) {
zfcp_fsf_req_free(req);
return ERR_PTR(-ENOMEM);
}
req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
req->qtcb->prefix.req_id = req->req_id;
req->qtcb->prefix.ulp_info = 26;
req->qtcb->prefix.qtcb_type = fsf_qtcb_type[fsf_cmd];
req->qtcb->prefix.qtcb_version = FSF_QTCB_CURRENT_VERSION;
req->qtcb->header.req_handle = req->req_id;
req->qtcb->header.fsf_command = fsf_cmd;
}
zfcp_qdio_req_init(adapter->qdio, &req->qdio_req, req->req_id, sbtype,
req->qtcb, sizeof(struct fsf_qtcb));
return req;
}
static int zfcp_fsf_req_send(struct zfcp_fsf_req *req)
{
const bool is_srb = zfcp_fsf_req_is_status_read_buffer(req);
struct zfcp_adapter *adapter = req->adapter;
struct zfcp_qdio *qdio = adapter->qdio;
int req_id = req->req_id;
zfcp_reqlist_add(adapter->req_list, req);
req->qdio_req.qdio_outb_usage = atomic_read(&qdio->req_q_free);
req->issued = get_tod_clock();
if (zfcp_qdio_send(qdio, &req->qdio_req)) {
del_timer(&req->timer);
/* lookup request again, list might have changed */
zfcp_reqlist_find_rm(adapter->req_list, req_id);
zfcp_erp_adapter_reopen(adapter, 0, "fsrs__1");
return -EIO;
}
/*
* NOTE: DO NOT TOUCH ASYNC req PAST THIS POINT.
* ONLY TOUCH SYNC req AGAIN ON req->completion.
*
* The request might complete and be freed concurrently at any point
* now. This is not protected by the QDIO-lock (req_q_lock). So any
* uncontrolled access after this might result in an use-after-free bug.
* Only if the request doesn't have ZFCP_STATUS_FSFREQ_CLEANUP set, and
* when it is completed via req->completion, is it safe to use req
* again.
*/
/* Don't increase for unsolicited status */
if (!is_srb)
adapter->fsf_req_seq_no++;
adapter->req_no++;
return 0;
}
/**
* zfcp_fsf_status_read - send status read request
* @qdio: pointer to struct zfcp_qdio
* Returns: 0 on success, ERROR otherwise
*/
int zfcp_fsf_status_read(struct zfcp_qdio *qdio)
{
struct zfcp_adapter *adapter = qdio->adapter;
struct zfcp_fsf_req *req;
struct fsf_status_read_buffer *sr_buf;
struct page *page;
int retval = -EIO;
spin_lock_irq(&qdio->req_q_lock);
if (zfcp_qdio_sbal_get(qdio))
goto out;
req = zfcp_fsf_req_create(qdio, FSF_QTCB_UNSOLICITED_STATUS,
SBAL_SFLAGS0_TYPE_STATUS,
adapter->pool.status_read_req);
if (IS_ERR(req)) {
retval = PTR_ERR(req);
goto out;
}
page = mempool_alloc(adapter->pool.sr_data, GFP_ATOMIC);
if (!page) {
retval = -ENOMEM;
goto failed_buf;
}
sr_buf = page_address(page);
memset(sr_buf, 0, sizeof(*sr_buf));
req->data = sr_buf;
zfcp_qdio_fill_next(qdio, &req->qdio_req, sr_buf, sizeof(*sr_buf));
zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
retval = zfcp_fsf_req_send(req);
if (retval)
goto failed_req_send;
/* NOTE: DO NOT TOUCH req PAST THIS POINT! */
goto out;
failed_req_send:
req->data = NULL;
mempool_free(virt_to_page(sr_buf), adapter->pool.sr_data);
failed_buf:
zfcp_dbf_hba_fsf_uss("fssr__1", req);
zfcp_fsf_req_free(req);
out:
spin_unlock_irq(&qdio->req_q_lock);
return retval;
}
static void zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *req)
{
struct scsi_device *sdev = req->data;
struct zfcp_scsi_dev *zfcp_sdev;
union fsf_status_qual *fsq = &req->qtcb->header.fsf_status_qual;
if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
return;
zfcp_sdev = sdev_to_zfcp(sdev);
switch (req->qtcb->header.fsf_status) {
case FSF_PORT_HANDLE_NOT_VALID:
if (fsq->word[0] == fsq->word[1]) {
zfcp_erp_adapter_reopen(zfcp_sdev->port->adapter, 0,
"fsafch1");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
}
break;
case FSF_LUN_HANDLE_NOT_VALID:
if (fsq->word[0] == fsq->word[1]) {
zfcp_erp_port_reopen(zfcp_sdev->port, 0, "fsafch2");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
}
break;
case FSF_FCP_COMMAND_DOES_NOT_EXIST:
req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
break;
case FSF_PORT_BOXED:
zfcp_erp_set_port_status(zfcp_sdev->port,
ZFCP_STATUS_COMMON_ACCESS_BOXED);
zfcp_erp_port_reopen(zfcp_sdev->port,
ZFCP_STATUS_COMMON_ERP_FAILED, "fsafch3");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_LUN_BOXED:
zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_ACCESS_BOXED);
zfcp_erp_lun_reopen(sdev, ZFCP_STATUS_COMMON_ERP_FAILED,
"fsafch4");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
switch (fsq->word[0]) {
case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
zfcp_fc_test_link(zfcp_sdev->port);
/* fall through */
case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
break;
case FSF_GOOD:
req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
break;
}
}
/**
* zfcp_fsf_abort_fcp_cmnd - abort running SCSI command
* @scmnd: The SCSI command to abort
* Returns: pointer to struct zfcp_fsf_req
*/
struct zfcp_fsf_req *zfcp_fsf_abort_fcp_cmnd(struct scsi_cmnd *scmnd)
{
struct zfcp_fsf_req *req = NULL;
struct scsi_device *sdev = scmnd->device;
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
struct zfcp_qdio *qdio = zfcp_sdev->port->adapter->qdio;
unsigned long old_req_id = (unsigned long) scmnd->host_scribble;
spin_lock_irq(&qdio->req_q_lock);
if (zfcp_qdio_sbal_get(qdio))
goto out;
req = zfcp_fsf_req_create(qdio, FSF_QTCB_ABORT_FCP_CMND,
SBAL_SFLAGS0_TYPE_READ,
qdio->adapter->pool.scsi_abort);
if (IS_ERR(req)) {
req = NULL;
goto out;
}
if (unlikely(!(atomic_read(&zfcp_sdev->status) &
ZFCP_STATUS_COMMON_UNBLOCKED)))
goto out_error_free;
zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
req->data = sdev;
req->handler = zfcp_fsf_abort_fcp_command_handler;
req->qtcb->header.lun_handle = zfcp_sdev->lun_handle;
req->qtcb->header.port_handle = zfcp_sdev->port->handle;
req->qtcb->bottom.support.req_handle = (u64) old_req_id;
zfcp_fsf_start_timer(req, ZFCP_FSF_SCSI_ER_TIMEOUT);
if (!zfcp_fsf_req_send(req)) {
/* NOTE: DO NOT TOUCH req, UNTIL IT COMPLETES! */
goto out;
}
out_error_free:
zfcp_fsf_req_free(req);
req = NULL;
out:
spin_unlock_irq(&qdio->req_q_lock);
return req;
}
static void zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *req)
{
struct zfcp_adapter *adapter = req->adapter;
struct zfcp_fsf_ct_els *ct = req->data;
struct fsf_qtcb_header *header = &req->qtcb->header;
ct->status = -EINVAL;
if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
goto skip_fsfstatus;
switch (header->fsf_status) {
case FSF_GOOD:
ct->status = 0;
zfcp_dbf_san_res("fsscth2", req);
break;
case FSF_SERVICE_CLASS_NOT_SUPPORTED:
zfcp_fsf_class_not_supp(req);
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
switch (header->fsf_status_qual.word[0]){
case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
break;
case FSF_PORT_BOXED:
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_PORT_HANDLE_NOT_VALID:
zfcp_erp_adapter_reopen(adapter, 0, "fsscth1");
/* fall through */
case FSF_GENERIC_COMMAND_REJECTED:
case FSF_PAYLOAD_SIZE_MISMATCH:
case FSF_REQUEST_SIZE_TOO_LARGE:
case FSF_RESPONSE_SIZE_TOO_LARGE:
case FSF_SBAL_MISMATCH:
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
skip_fsfstatus:
if (ct->handler)
ct->handler(ct->handler_data);
}
static void zfcp_fsf_setup_ct_els_unchained(struct zfcp_qdio *qdio,
struct zfcp_qdio_req *q_req,
struct scatterlist *sg_req,
struct scatterlist *sg_resp)
{
zfcp_qdio_fill_next(qdio, q_req, sg_virt(sg_req), sg_req->length);
zfcp_qdio_fill_next(qdio, q_req, sg_virt(sg_resp), sg_resp->length);
zfcp_qdio_set_sbale_last(qdio, q_req);
}
static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
struct scatterlist *sg_req,
struct scatterlist *sg_resp)
{
struct zfcp_adapter *adapter = req->adapter;
struct zfcp_qdio *qdio = adapter->qdio;
struct fsf_qtcb *qtcb = req->qtcb;
u32 feat = adapter->adapter_features;
if (zfcp_adapter_multi_buffer_active(adapter)) {
if (zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, sg_req))
return -EIO;
qtcb->bottom.support.req_buf_length =
zfcp_qdio_real_bytes(sg_req);
if (zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, sg_resp))
return -EIO;
qtcb->bottom.support.resp_buf_length =
zfcp_qdio_real_bytes(sg_resp);
zfcp_qdio_set_data_div(qdio, &req->qdio_req, sg_nents(sg_req));
zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
zfcp_qdio_set_scount(qdio, &req->qdio_req);
return 0;
}
/* use single, unchained SBAL if it can hold the request */
if (zfcp_qdio_sg_one_sbale(sg_req) && zfcp_qdio_sg_one_sbale(sg_resp)) {
zfcp_fsf_setup_ct_els_unchained(qdio, &req->qdio_req,
sg_req, sg_resp);
return 0;
}
if (!(feat & FSF_FEATURE_ELS_CT_CHAINED_SBALS))
return -EOPNOTSUPP;
if (zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, sg_req))
return -EIO;
qtcb->bottom.support.req_buf_length = zfcp_qdio_real_bytes(sg_req);
zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
zfcp_qdio_skip_to_last_sbale(qdio, &req->qdio_req);
if (zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, sg_resp))
return -EIO;
qtcb->bottom.support.resp_buf_length = zfcp_qdio_real_bytes(sg_resp);
zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
return 0;
}
static int zfcp_fsf_setup_ct_els(struct zfcp_fsf_req *req,
struct scatterlist *sg_req,
struct scatterlist *sg_resp,
unsigned int timeout)
{
int ret;
ret = zfcp_fsf_setup_ct_els_sbals(req, sg_req, sg_resp);
if (ret)
return ret;
/* common settings for ct/gs and els requests */
if (timeout > 255)
timeout = 255; /* max value accepted by hardware */
req->qtcb->bottom.support.service_class = FSF_CLASS_3;
req->qtcb->bottom.support.timeout = timeout;
zfcp_fsf_start_timer(req, (timeout + 10) * HZ);
return 0;
}
/**
* zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
* @wka_port: pointer to zfcp WKA port to send CT/GS to
* @ct: pointer to struct zfcp_send_ct with data for request
* @pool: if non-null this mempool is used to allocate struct zfcp_fsf_req
* @timeout: timeout that hardware should use, and a later software timeout
*/
int zfcp_fsf_send_ct(struct zfcp_fc_wka_port *wka_port,
struct zfcp_fsf_ct_els *ct, mempool_t *pool,
unsigned int timeout)
{
struct zfcp_qdio *qdio = wka_port->adapter->qdio;
struct zfcp_fsf_req *req;
int ret = -EIO;
spin_lock_irq(&qdio->req_q_lock);
if (zfcp_qdio_sbal_get(qdio))
goto out;
req = zfcp_fsf_req_create(qdio, FSF_QTCB_SEND_GENERIC,
SBAL_SFLAGS0_TYPE_WRITE_READ, pool);
if (IS_ERR(req)) {
ret = PTR_ERR(req);
goto out;
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
ret = zfcp_fsf_setup_ct_els(req, ct->req, ct->resp, timeout);
if (ret)
goto failed_send;
req->handler = zfcp_fsf_send_ct_handler;
req->qtcb->header.port_handle = wka_port->handle;
ct->d_id = wka_port->d_id;
req->data = ct;
zfcp_dbf_san_req("fssct_1", req, wka_port->d_id);
ret = zfcp_fsf_req_send(req);
if (ret)
goto failed_send;
/* NOTE: DO NOT TOUCH req PAST THIS POINT! */
goto out;
failed_send:
zfcp_fsf_req_free(req);
out:
spin_unlock_irq(&qdio->req_q_lock);
return ret;
}
static void zfcp_fsf_send_els_handler(struct zfcp_fsf_req *req)
{
struct zfcp_fsf_ct_els *send_els = req->data;
struct fsf_qtcb_header *header = &req->qtcb->header;
send_els->status = -EINVAL;
if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
goto skip_fsfstatus;
switch (header->fsf_status) {
case FSF_GOOD:
send_els->status = 0;
zfcp_dbf_san_res("fsselh1", req);
break;
case FSF_SERVICE_CLASS_NOT_SUPPORTED:
zfcp_fsf_class_not_supp(req);
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
switch (header->fsf_status_qual.word[0]){
case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
case FSF_SQ_RETRY_IF_POSSIBLE:
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
break;
case FSF_ELS_COMMAND_REJECTED:
case FSF_PAYLOAD_SIZE_MISMATCH:
case FSF_REQUEST_SIZE_TOO_LARGE:
case FSF_RESPONSE_SIZE_TOO_LARGE:
break;
case FSF_SBAL_MISMATCH:
/* should never occur, avoided in zfcp_fsf_send_els */
/* fall through */
default:
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
skip_fsfstatus:
if (send_els->handler)
send_els->handler(send_els->handler_data);
}
/**
* zfcp_fsf_send_els - initiate an ELS command (FC-FS)
* @adapter: pointer to zfcp adapter
* @d_id: N_Port_ID to send ELS to
* @els: pointer to struct zfcp_send_els with data for the command
* @timeout: timeout that hardware should use, and a later software timeout
*/
int zfcp_fsf_send_els(struct zfcp_adapter *adapter, u32 d_id,
struct zfcp_fsf_ct_els *els, unsigned int timeout)
{
struct zfcp_fsf_req *req;
struct zfcp_qdio *qdio = adapter->qdio;
int ret = -EIO;
spin_lock_irq(&qdio->req_q_lock);
if (zfcp_qdio_sbal_get(qdio))
goto out;
req = zfcp_fsf_req_create(qdio, FSF_QTCB_SEND_ELS,
SBAL_SFLAGS0_TYPE_WRITE_READ, NULL);
if (IS_ERR(req)) {
ret = PTR_ERR(req);
goto out;
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
if (!zfcp_adapter_multi_buffer_active(adapter))
zfcp_qdio_sbal_limit(qdio, &req->qdio_req, 2);
ret = zfcp_fsf_setup_ct_els(req, els->req, els->resp, timeout);
if (ret)
goto failed_send;
hton24(req->qtcb->bottom.support.d_id, d_id);
req->handler = zfcp_fsf_send_els_handler;
els->d_id = d_id;
req->data = els;
zfcp_dbf_san_req("fssels1", req, d_id);
ret = zfcp_fsf_req_send(req);
if (ret)
goto failed_send;
/* NOTE: DO NOT TOUCH req PAST THIS POINT! */
goto out;
failed_send:
zfcp_fsf_req_free(req);
out:
spin_unlock_irq(&qdio->req_q_lock);
return ret;
}
int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
{
struct zfcp_fsf_req *req;
struct zfcp_qdio *qdio = erp_action->adapter->qdio;
int retval = -EIO;
spin_lock_irq(&qdio->req_q_lock);
if (zfcp_qdio_sbal_get(qdio))
goto out;
req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_CONFIG_DATA,
SBAL_SFLAGS0_TYPE_READ,
qdio->adapter->pool.erp_req);
if (IS_ERR(req)) {
retval = PTR_ERR(req);
goto out;
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
req->qtcb->bottom.config.feature_selection =
FSF_FEATURE_NOTIFICATION_LOST |
FSF_FEATURE_UPDATE_ALERT;
req->erp_action = erp_action;
req->handler = zfcp_fsf_exchange_config_data_handler;
erp_action->fsf_req_id = req->req_id;
zfcp_fsf_start_erp_timer(req);
retval = zfcp_fsf_req_send(req);
if (retval) {
zfcp_fsf_req_free(req);
erp_action->fsf_req_id = 0;
}
/* NOTE: DO NOT TOUCH req PAST THIS POINT! */
out:
spin_unlock_irq(&qdio->req_q_lock);
return retval;
}
int zfcp_fsf_exchange_config_data_sync(struct zfcp_qdio *qdio,
struct fsf_qtcb_bottom_config *data)
{
struct zfcp_fsf_req *req = NULL;
int retval = -EIO;
spin_lock_irq(&qdio->req_q_lock);
if (zfcp_qdio_sbal_get(qdio))
goto out_unlock;
req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_CONFIG_DATA,
SBAL_SFLAGS0_TYPE_READ, NULL);
if (IS_ERR(req)) {
retval = PTR_ERR(req);
goto out_unlock;
}
zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
req->handler = zfcp_fsf_exchange_config_data_handler;
req->qtcb->bottom.config.feature_selection =
FSF_FEATURE_NOTIFICATION_LOST |
FSF_FEATURE_UPDATE_ALERT;
if (data)
req->data = data;
zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
retval = zfcp_fsf_req_send(req);
spin_unlock_irq(&qdio->req_q_lock);
if (!retval) {
/* NOTE: ONLY TOUCH SYNC req AGAIN ON req->completion. */
wait_for_completion(&req->completion);
}
zfcp_fsf_req_free(req);
return retval;
out_unlock:
spin_unlock_irq(&qdio->req_q_lock);
return retval;
}
/**
* zfcp_fsf_exchange_port_data - request information about local port
* @erp_action: ERP action for the adapter for which port data is requested
* Returns: 0 on success, error otherwise
*/
int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
{
struct zfcp_qdio *qdio = erp_action->adapter->qdio;
struct zfcp_fsf_req *req;
int retval = -EIO;
if (!(qdio->adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
return -EOPNOTSUPP;
spin_lock_irq(&qdio->req_q_lock);
if (zfcp_qdio_sbal_get(qdio))
goto out;
req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_PORT_DATA,
SBAL_SFLAGS0_TYPE_READ,
qdio->adapter->pool.erp_req);
if (IS_ERR(req)) {
retval = PTR_ERR(req);
goto out;
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
req->handler = zfcp_fsf_exchange_port_data_handler;
req->erp_action = erp_action;
erp_action->fsf_req_id = req->req_id;
zfcp_fsf_start_erp_timer(req);
retval = zfcp_fsf_req_send(req);
if (retval) {
zfcp_fsf_req_free(req);
erp_action->fsf_req_id = 0;
}
/* NOTE: DO NOT TOUCH req PAST THIS POINT! */
out:
spin_unlock_irq(&qdio->req_q_lock);
return retval;
}
/**
* zfcp_fsf_exchange_port_data_sync - request information about local port
* @qdio: pointer to struct zfcp_qdio
* @data: pointer to struct fsf_qtcb_bottom_port
* Returns: 0 on success, error otherwise
*/
int zfcp_fsf_exchange_port_data_sync(struct zfcp_qdio *qdio,
struct fsf_qtcb_bottom_port *data)
{
struct zfcp_fsf_req *req = NULL;
int retval = -EIO;
if (!(qdio->adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
return -EOPNOTSUPP;
spin_lock_irq(&qdio->req_q_lock);
if (zfcp_qdio_sbal_get(qdio))
goto out_unlock;
req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_PORT_DATA,
SBAL_SFLAGS0_TYPE_READ, NULL);
if (IS_ERR(req)) {
retval = PTR_ERR(req);
goto out_unlock;
}
if (data)
req->data = data;
zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
req->handler = zfcp_fsf_exchange_port_data_handler;
zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
retval = zfcp_fsf_req_send(req);
spin_unlock_irq(&qdio->req_q_lock);
if (!retval) {
/* NOTE: ONLY TOUCH SYNC req AGAIN ON req->completion. */
wait_for_completion(&req->completion);
}
zfcp_fsf_req_free(req);
return retval;
out_unlock:
spin_unlock_irq(&qdio->req_q_lock);
return retval;
}
static void zfcp_fsf_open_port_handler(struct zfcp_fsf_req *req)
{
struct zfcp_port *port = req->data;
struct fsf_qtcb_header *header = &req->qtcb->header;
struct fc_els_flogi *plogi;
if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
goto out;
switch (header->fsf_status) {
case FSF_PORT_ALREADY_OPEN:
break;
case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
dev_warn(&req->adapter->ccw_device->dev,
"Not enough FCP adapter resources to open "
"remote port 0x%016Lx\n",
(unsigned long long)port->wwpn);
zfcp_erp_set_port_status(port,
ZFCP_STATUS_COMMON_ERP_FAILED);
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
switch (header->fsf_status_qual.word[0]) {
case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
/* no zfcp_fc_test_link() with failed open port */
/* fall through */
case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
case FSF_SQ_NO_RETRY_POSSIBLE:
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
break;
case FSF_GOOD:
port->handle = header->port_handle;
atomic_or(ZFCP_STATUS_COMMON_OPEN |
ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
atomic_andnot(ZFCP_STATUS_COMMON_ACCESS_BOXED,
&port->status);
/* check whether D_ID has changed during open */
/*
* FIXME: This check is not airtight, as the FCP channel does
* not monitor closures of target port connections caused on
* the remote side. Thus, they might miss out on invalidating
* locally cached WWPNs (and other N_Port parameters) of gone
* target ports. So, our heroic attempt to make things safe
* could be undermined by 'open port' response data tagged with
* obsolete WWPNs. Another reason to monitor potential
* connection closures ourself at least (by interpreting
* incoming ELS' and unsolicited status). It just crosses my
* mind that one should be able to cross-check by means of
* another GID_PN straight after a port has been opened.
* Alternately, an ADISC/PDISC ELS should suffice, as well.
*/
plogi = (struct fc_els_flogi *) req->qtcb->bottom.support.els;
if (req->qtcb->bottom.support.els1_length >=
FSF_PLOGI_MIN_LEN)
zfcp_fc_plogi_evaluate(port, plogi);
break;
case FSF_UNKNOWN_OP_SUBTYPE:
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
out:
put_device(&port->dev);
}
/**
* zfcp_fsf_open_port - create and send open port request
* @erp_action: pointer to struct zfcp_erp_action
* Returns: 0 on success, error otherwise
*/
int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
{
struct zfcp_qdio *qdio = erp_action->adapter->qdio;
struct zfcp_port *port = erp_action->port;
struct zfcp_fsf_req *req;
int retval = -EIO;
spin_lock_irq(&qdio->req_q_lock);
if (zfcp_qdio_sbal_get(qdio))
goto out;
req = zfcp_fsf_req_create(qdio, FSF_QTCB_OPEN_PORT_WITH_DID,
SBAL_SFLAGS0_TYPE_READ,
qdio->adapter->pool.erp_req);
if (IS_ERR(req)) {
retval = PTR_ERR(req);
goto out;
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
req->handler = zfcp_fsf_open_port_handler;
hton24(req->qtcb->bottom.support.d_id, port->d_id);
req->data = port;
req->erp_action = erp_action;
erp_action->fsf_req_id = req->req_id;
get_device(&port->dev);
zfcp_fsf_start_erp_timer(req);
retval = zfcp_fsf_req_send(req);
if (retval) {
zfcp_fsf_req_free(req);
erp_action->fsf_req_id = 0;
put_device(&port->dev);
}
/* NOTE: DO NOT TOUCH req PAST THIS POINT! */
out:
spin_unlock_irq(&qdio->req_q_lock);
return retval;
}
static void zfcp_fsf_close_port_handler(struct zfcp_fsf_req *req)
{
struct zfcp_port *port = req->data;
if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
return;
switch (req->qtcb->header.fsf_status) {
case FSF_PORT_HANDLE_NOT_VALID:
zfcp_erp_adapter_reopen(port->adapter, 0, "fscph_1");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
break;
case FSF_GOOD:
zfcp_erp_clear_port_status(port, ZFCP_STATUS_COMMON_OPEN);
break;
}
}
/**
* zfcp_fsf_close_port - create and send close port request
* @erp_action: pointer to struct zfcp_erp_action
* Returns: 0 on success, error otherwise
*/
int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
{
struct zfcp_qdio *qdio = erp_action->adapter->qdio;
struct zfcp_fsf_req *req;
int retval = -EIO;
spin_lock_irq(&qdio->req_q_lock);
if (zfcp_qdio_sbal_get(qdio))
goto out;
req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_PORT,
SBAL_SFLAGS0_TYPE_READ,
qdio->adapter->pool.erp_req);
if (IS_ERR(req)) {
retval = PTR_ERR(req);
goto out;
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
req->handler = zfcp_fsf_close_port_handler;
req->data = erp_action->port;
req->erp_action = erp_action;
req->qtcb->header.port_handle = erp_action->port->handle;
erp_action->fsf_req_id = req->req_id;
zfcp_fsf_start_erp_timer(req);
retval = zfcp_fsf_req_send(req);
if (retval) {
zfcp_fsf_req_free(req);
erp_action->fsf_req_id = 0;
}
/* NOTE: DO NOT TOUCH req PAST THIS POINT! */
out:
spin_unlock_irq(&qdio->req_q_lock);
return retval;
}
static void zfcp_fsf_open_wka_port_handler(struct zfcp_fsf_req *req)
{
struct zfcp_fc_wka_port *wka_port = req->data;
struct fsf_qtcb_header *header = &req->qtcb->header;
if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
goto out;
}
switch (header->fsf_status) {
case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
dev_warn(&req->adapter->ccw_device->dev,
"Opening WKA port 0x%x failed\n", wka_port->d_id);
/* fall through */
case FSF_ADAPTER_STATUS_AVAILABLE:
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
break;
case FSF_GOOD:
wka_port->handle = header->port_handle;
/* fall through */
case FSF_PORT_ALREADY_OPEN:
wka_port->status = ZFCP_FC_WKA_PORT_ONLINE;
}
out:
wake_up(&wka_port->completion_wq);
}
/**
* zfcp_fsf_open_wka_port - create and send open wka-port request
* @wka_port: pointer to struct zfcp_fc_wka_port
* Returns: 0 on success, error otherwise
*/
int zfcp_fsf_open_wka_port(struct zfcp_fc_wka_port *wka_port)
{
struct zfcp_qdio *qdio = wka_port->adapter->qdio;
struct zfcp_fsf_req *req;
int retval = -EIO;
spin_lock_irq(&qdio->req_q_lock);
if (zfcp_qdio_sbal_get(qdio))
goto out;
req = zfcp_fsf_req_create(qdio, FSF_QTCB_OPEN_PORT_WITH_DID,
SBAL_SFLAGS0_TYPE_READ,
qdio->adapter->pool.erp_req);
if (IS_ERR(req)) {
retval = PTR_ERR(req);
goto out;
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
req->handler = zfcp_fsf_open_wka_port_handler;
hton24(req->qtcb->bottom.support.d_id, wka_port->d_id);
req->data = wka_port;
zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
retval = zfcp_fsf_req_send(req);
if (retval)
zfcp_fsf_req_free(req);
/* NOTE: DO NOT TOUCH req PAST THIS POINT! */
out:
spin_unlock_irq(&qdio->req_q_lock);
if (!retval)
zfcp_dbf_rec_run_wka("fsowp_1", wka_port, req->req_id);
return retval;
}
static void zfcp_fsf_close_wka_port_handler(struct zfcp_fsf_req *req)
{
struct zfcp_fc_wka_port *wka_port = req->data;
if (req->qtcb->header.fsf_status == FSF_PORT_HANDLE_NOT_VALID) {
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
zfcp_erp_adapter_reopen(wka_port->adapter, 0, "fscwph1");
}
wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
wake_up(&wka_port->completion_wq);
}
/**
* zfcp_fsf_close_wka_port - create and send close wka port request
* @wka_port: WKA port to open
* Returns: 0 on success, error otherwise
*/
int zfcp_fsf_close_wka_port(struct zfcp_fc_wka_port *wka_port)
{
struct zfcp_qdio *qdio = wka_port->adapter->qdio;
struct zfcp_fsf_req *req;
int retval = -EIO;
spin_lock_irq(&qdio->req_q_lock);
if (zfcp_qdio_sbal_get(qdio))
goto out;
req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_PORT,
SBAL_SFLAGS0_TYPE_READ,
qdio->adapter->pool.erp_req);
if (IS_ERR(req)) {
retval = PTR_ERR(req);
goto out;
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
req->handler = zfcp_fsf_close_wka_port_handler;
req->data = wka_port;
req->qtcb->header.port_handle = wka_port->handle;
zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
retval = zfcp_fsf_req_send(req);
if (retval)
zfcp_fsf_req_free(req);
/* NOTE: DO NOT TOUCH req PAST THIS POINT! */
out:
spin_unlock_irq(&qdio->req_q_lock);
if (!retval)
zfcp_dbf_rec_run_wka("fscwp_1", wka_port, req->req_id);
return retval;
}
static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
{
struct zfcp_port *port = req->data;
struct fsf_qtcb_header *header = &req->qtcb->header;
struct scsi_device *sdev;
if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
return;
switch (header->fsf_status) {
case FSF_PORT_HANDLE_NOT_VALID:
zfcp_erp_adapter_reopen(port->adapter, 0, "fscpph1");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_PORT_BOXED:
/* can't use generic zfcp_erp_modify_port_status because
* ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
atomic_andnot(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
shost_for_each_device(sdev, port->adapter->scsi_host)
if (sdev_to_zfcp(sdev)->port == port)
atomic_andnot(ZFCP_STATUS_COMMON_OPEN,
&sdev_to_zfcp(sdev)->status);
zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ACCESS_BOXED);
zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
"fscpph2");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
switch (header->fsf_status_qual.word[0]) {
case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
/* fall through */
case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
break;
case FSF_GOOD:
/* can't use generic zfcp_erp_modify_port_status because
* ZFCP_STATUS_COMMON_OPEN must not be reset for the port
*/
atomic_andnot(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
shost_for_each_device(sdev, port->adapter->scsi_host)
if (sdev_to_zfcp(sdev)->port == port)
atomic_andnot(ZFCP_STATUS_COMMON_OPEN,
&sdev_to_zfcp(sdev)->status);
break;
}
}
/**
* zfcp_fsf_close_physical_port - close physical port
* @erp_action: pointer to struct zfcp_erp_action
* Returns: 0 on success
*/
int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
{
struct zfcp_qdio *qdio = erp_action->adapter->qdio;
struct zfcp_fsf_req *req;
int retval = -EIO;
spin_lock_irq(&qdio->req_q_lock);
if (zfcp_qdio_sbal_get(qdio))
goto out;
req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_PHYSICAL_PORT,
SBAL_SFLAGS0_TYPE_READ,
qdio->adapter->pool.erp_req);
if (IS_ERR(req)) {
retval = PTR_ERR(req);
goto out;
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
req->data = erp_action->port;
req->qtcb->header.port_handle = erp_action->port->handle;
req->erp_action = erp_action;
req->handler = zfcp_fsf_close_physical_port_handler;
erp_action->fsf_req_id = req->req_id;
zfcp_fsf_start_erp_timer(req);
retval = zfcp_fsf_req_send(req);
if (retval) {
zfcp_fsf_req_free(req);
erp_action->fsf_req_id = 0;
}
/* NOTE: DO NOT TOUCH req PAST THIS POINT! */
out:
spin_unlock_irq(&qdio->req_q_lock);
return retval;
}
static void zfcp_fsf_open_lun_handler(struct zfcp_fsf_req *req)
{
struct zfcp_adapter *adapter = req->adapter;
struct scsi_device *sdev = req->data;
struct zfcp_scsi_dev *zfcp_sdev;
struct fsf_qtcb_header *header = &req->qtcb->header;
union fsf_status_qual *qual = &header->fsf_status_qual;
if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
return;
zfcp_sdev = sdev_to_zfcp(sdev);
atomic_andnot(ZFCP_STATUS_COMMON_ACCESS_DENIED |
ZFCP_STATUS_COMMON_ACCESS_BOXED,
&zfcp_sdev->status);
switch (header->fsf_status) {
case FSF_PORT_HANDLE_NOT_VALID:
zfcp_erp_adapter_reopen(adapter, 0, "fsouh_1");
/* fall through */
case FSF_LUN_ALREADY_OPEN:
break;
case FSF_PORT_BOXED:
zfcp_erp_set_port_status(zfcp_sdev->port,
ZFCP_STATUS_COMMON_ACCESS_BOXED);
zfcp_erp_port_reopen(zfcp_sdev->port,
ZFCP_STATUS_COMMON_ERP_FAILED, "fsouh_2");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_LUN_SHARING_VIOLATION:
if (qual->word[0])
dev_warn(&zfcp_sdev->port->adapter->ccw_device->dev,
"LUN 0x%016Lx on port 0x%016Lx is already in "
"use by CSS%d, MIF Image ID %x\n",
zfcp_scsi_dev_lun(sdev),
(unsigned long long)zfcp_sdev->port->wwpn,
qual->fsf_queue_designator.cssid,
qual->fsf_queue_designator.hla);
zfcp_erp_set_lun_status(sdev,
ZFCP_STATUS_COMMON_ERP_FAILED |
ZFCP_STATUS_COMMON_ACCESS_DENIED);
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
dev_warn(&adapter->ccw_device->dev,
"No handle is available for LUN "
"0x%016Lx on port 0x%016Lx\n",
(unsigned long long)zfcp_scsi_dev_lun(sdev),
(unsigned long long)zfcp_sdev->port->wwpn);
zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_ERP_FAILED);
/* fall through */
case FSF_INVALID_COMMAND_OPTION:
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
switch (header->fsf_status_qual.word[0]) {
case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
zfcp_fc_test_link(zfcp_sdev->port);
/* fall through */
case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
break;
case FSF_GOOD:
zfcp_sdev->lun_handle = header->lun_handle;
atomic_or(ZFCP_STATUS_COMMON_OPEN, &zfcp_sdev->status);
break;
}
}
/**
* zfcp_fsf_open_lun - open LUN
* @erp_action: pointer to struct zfcp_erp_action
* Returns: 0 on success, error otherwise
*/
int zfcp_fsf_open_lun(struct zfcp_erp_action *erp_action)
{
struct zfcp_adapter *adapter = erp_action->adapter;
struct zfcp_qdio *qdio = adapter->qdio;
struct zfcp_fsf_req *req;
int retval = -EIO;
spin_lock_irq(&qdio->req_q_lock);
if (zfcp_qdio_sbal_get(qdio))
goto out;
req = zfcp_fsf_req_create(qdio, FSF_QTCB_OPEN_LUN,
SBAL_SFLAGS0_TYPE_READ,
adapter->pool.erp_req);
if (IS_ERR(req)) {
retval = PTR_ERR(req);
goto out;
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
req->qtcb->header.port_handle = erp_action->port->handle;
req->qtcb->bottom.support.fcp_lun = zfcp_scsi_dev_lun(erp_action->sdev);
req->handler = zfcp_fsf_open_lun_handler;
req->data = erp_action->sdev;
req->erp_action = erp_action;
erp_action->fsf_req_id = req->req_id;
if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE))
req->qtcb->bottom.support.option = FSF_OPEN_LUN_SUPPRESS_BOXING;
zfcp_fsf_start_erp_timer(req);
retval = zfcp_fsf_req_send(req);
if (retval) {
zfcp_fsf_req_free(req);
erp_action->fsf_req_id = 0;
}
/* NOTE: DO NOT TOUCH req PAST THIS POINT! */
out:
spin_unlock_irq(&qdio->req_q_lock);
return retval;
}
static void zfcp_fsf_close_lun_handler(struct zfcp_fsf_req *req)
{
struct scsi_device *sdev = req->data;
struct zfcp_scsi_dev *zfcp_sdev;
if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
return;
zfcp_sdev = sdev_to_zfcp(sdev);
switch (req->qtcb->header.fsf_status) {
case FSF_PORT_HANDLE_NOT_VALID:
zfcp_erp_adapter_reopen(zfcp_sdev->port->adapter, 0, "fscuh_1");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_LUN_HANDLE_NOT_VALID:
zfcp_erp_port_reopen(zfcp_sdev->port, 0, "fscuh_2");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_PORT_BOXED:
zfcp_erp_set_port_status(zfcp_sdev->port,
ZFCP_STATUS_COMMON_ACCESS_BOXED);
zfcp_erp_port_reopen(zfcp_sdev->port,
ZFCP_STATUS_COMMON_ERP_FAILED, "fscuh_3");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
switch (req->qtcb->header.fsf_status_qual.word[0]) {
case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
zfcp_fc_test_link(zfcp_sdev->port);
/* fall through */
case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
break;
case FSF_GOOD:
atomic_andnot(ZFCP_STATUS_COMMON_OPEN, &zfcp_sdev->status);
break;
}
}
/**
* zfcp_fsf_close_LUN - close LUN
* @erp_action: pointer to erp_action triggering the "close LUN"
* Returns: 0 on success, error otherwise
*/
int zfcp_fsf_close_lun(struct zfcp_erp_action *erp_action)
{
struct zfcp_qdio *qdio = erp_action->adapter->qdio;
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(erp_action->sdev);
struct zfcp_fsf_req *req;
int retval = -EIO;
spin_lock_irq(&qdio->req_q_lock);
if (zfcp_qdio_sbal_get(qdio))
goto out;
req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_LUN,
SBAL_SFLAGS0_TYPE_READ,
qdio->adapter->pool.erp_req);
if (IS_ERR(req)) {
retval = PTR_ERR(req);
goto out;
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
req->qtcb->header.port_handle = erp_action->port->handle;
req->qtcb->header.lun_handle = zfcp_sdev->lun_handle;
req->handler = zfcp_fsf_close_lun_handler;
req->data = erp_action->sdev;
req->erp_action = erp_action;
erp_action->fsf_req_id = req->req_id;
zfcp_fsf_start_erp_timer(req);
retval = zfcp_fsf_req_send(req);
if (retval) {
zfcp_fsf_req_free(req);
erp_action->fsf_req_id = 0;
}
/* NOTE: DO NOT TOUCH req PAST THIS POINT! */
out:
spin_unlock_irq(&qdio->req_q_lock);
return retval;
}
static void zfcp_fsf_update_lat(struct zfcp_latency_record *lat_rec, u32 lat)
{
lat_rec->sum += lat;
lat_rec->min = min(lat_rec->min, lat);
lat_rec->max = max(lat_rec->max, lat);
}
static void zfcp_fsf_req_trace(struct zfcp_fsf_req *req, struct scsi_cmnd *scsi)
{
struct fsf_qual_latency_info *lat_in;
struct zfcp_latency_cont *lat = NULL;
struct zfcp_scsi_dev *zfcp_sdev;
struct zfcp_blk_drv_data blktrc;
int ticks = req->adapter->timer_ticks;
lat_in = &req->qtcb->prefix.prot_status_qual.latency_info;
blktrc.flags = 0;
blktrc.magic = ZFCP_BLK_DRV_DATA_MAGIC;
if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
blktrc.flags |= ZFCP_BLK_REQ_ERROR;
blktrc.inb_usage = 0;
blktrc.outb_usage = req->qdio_req.qdio_outb_usage;
if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA &&
!(req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
zfcp_sdev = sdev_to_zfcp(scsi->device);
blktrc.flags |= ZFCP_BLK_LAT_VALID;
blktrc.channel_lat = lat_in->channel_lat * ticks;
blktrc.fabric_lat = lat_in->fabric_lat * ticks;
switch (req->qtcb->bottom.io.data_direction) {
case FSF_DATADIR_DIF_READ_STRIP:
case FSF_DATADIR_DIF_READ_CONVERT:
case FSF_DATADIR_READ:
lat = &zfcp_sdev->latencies.read;
break;
case FSF_DATADIR_DIF_WRITE_INSERT:
case FSF_DATADIR_DIF_WRITE_CONVERT:
case FSF_DATADIR_WRITE:
lat = &zfcp_sdev->latencies.write;
break;
case FSF_DATADIR_CMND:
lat = &zfcp_sdev->latencies.cmd;
break;
}
if (lat) {
spin_lock(&zfcp_sdev->latencies.lock);
zfcp_fsf_update_lat(&lat->channel, lat_in->channel_lat);
zfcp_fsf_update_lat(&lat->fabric, lat_in->fabric_lat);
lat->counter++;
spin_unlock(&zfcp_sdev->latencies.lock);
}
}
blk_add_driver_data(scsi->request->q, scsi->request, &blktrc,
sizeof(blktrc));
}
/**
* zfcp_fsf_fcp_handler_common() - FCP response handler common to I/O and TMF.
* @req: Pointer to FSF request.
* @sdev: Pointer to SCSI device as request context.
*/
static void zfcp_fsf_fcp_handler_common(struct zfcp_fsf_req *req,
struct scsi_device *sdev)
{
struct zfcp_scsi_dev *zfcp_sdev;
struct fsf_qtcb_header *header = &req->qtcb->header;
if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
return;
zfcp_sdev = sdev_to_zfcp(sdev);
switch (header->fsf_status) {
case FSF_HANDLE_MISMATCH:
case FSF_PORT_HANDLE_NOT_VALID:
zfcp_erp_adapter_reopen(req->adapter, 0, "fssfch1");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_FCPLUN_NOT_VALID:
case FSF_LUN_HANDLE_NOT_VALID:
zfcp_erp_port_reopen(zfcp_sdev->port, 0, "fssfch2");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_SERVICE_CLASS_NOT_SUPPORTED:
zfcp_fsf_class_not_supp(req);
break;
case FSF_DIRECTION_INDICATOR_NOT_VALID:
dev_err(&req->adapter->ccw_device->dev,
"Incorrect direction %d, LUN 0x%016Lx on port "
"0x%016Lx closed\n",
req->qtcb->bottom.io.data_direction,
(unsigned long long)zfcp_scsi_dev_lun(sdev),
(unsigned long long)zfcp_sdev->port->wwpn);
zfcp_erp_adapter_shutdown(req->adapter, 0, "fssfch3");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_CMND_LENGTH_NOT_VALID:
dev_err(&req->adapter->ccw_device->dev,
"Incorrect FCP_CMND length %d, FCP device closed\n",
req->qtcb->bottom.io.fcp_cmnd_length);
zfcp_erp_adapter_shutdown(req->adapter, 0, "fssfch4");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_PORT_BOXED:
zfcp_erp_set_port_status(zfcp_sdev->port,
ZFCP_STATUS_COMMON_ACCESS_BOXED);
zfcp_erp_port_reopen(zfcp_sdev->port,
ZFCP_STATUS_COMMON_ERP_FAILED, "fssfch5");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_LUN_BOXED:
zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_ACCESS_BOXED);
zfcp_erp_lun_reopen(sdev, ZFCP_STATUS_COMMON_ERP_FAILED,
"fssfch6");
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
if (header->fsf_status_qual.word[0] ==
FSF_SQ_INVOKE_LINK_TEST_PROCEDURE)
zfcp_fc_test_link(zfcp_sdev->port);
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
}
static void zfcp_fsf_fcp_cmnd_handler(struct zfcp_fsf_req *req)
{
struct scsi_cmnd *scpnt;
struct fcp_resp_with_ext *fcp_rsp;
unsigned long flags;
read_lock_irqsave(&req->adapter->abort_lock, flags);
scpnt = req->data;
if (unlikely(!scpnt)) {
read_unlock_irqrestore(&req->adapter->abort_lock, flags);
return;
}
zfcp_fsf_fcp_handler_common(req, scpnt->device);
if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
set_host_byte(scpnt, DID_TRANSPORT_DISRUPTED);
goto skip_fsfstatus;
}
switch (req->qtcb->header.fsf_status) {
case FSF_INCONSISTENT_PROT_DATA:
case FSF_INVALID_PROT_PARM:
set_host_byte(scpnt, DID_ERROR);
goto skip_fsfstatus;
case FSF_BLOCK_GUARD_CHECK_FAILURE:
zfcp_scsi_dif_sense_error(scpnt, 0x1);
goto skip_fsfstatus;
case FSF_APP_TAG_CHECK_FAILURE:
zfcp_scsi_dif_sense_error(scpnt, 0x2);
goto skip_fsfstatus;
case FSF_REF_TAG_CHECK_FAILURE:
zfcp_scsi_dif_sense_error(scpnt, 0x3);
goto skip_fsfstatus;
}
BUILD_BUG_ON(sizeof(struct fcp_resp_with_ext) > FSF_FCP_RSP_SIZE);
fcp_rsp = &req->qtcb->bottom.io.fcp_rsp.iu;
zfcp_fc_eval_fcp_rsp(fcp_rsp, scpnt);
skip_fsfstatus:
zfcp_fsf_req_trace(req, scpnt);
zfcp_dbf_scsi_result(scpnt, req);
scpnt->host_scribble = NULL;
(scpnt->scsi_done) (scpnt);
/*
* We must hold this lock until scsi_done has been called.
* Otherwise we may call scsi_done after abort regarding this
* command has completed.
* Note: scsi_done must not block!
*/
read_unlock_irqrestore(&req->adapter->abort_lock, flags);
}
static int zfcp_fsf_set_data_dir(struct scsi_cmnd *scsi_cmnd, u32 *data_dir)
{
switch (scsi_get_prot_op(scsi_cmnd)) {
case SCSI_PROT_NORMAL:
switch (scsi_cmnd->sc_data_direction) {
case DMA_NONE:
*data_dir = FSF_DATADIR_CMND;
break;
case DMA_FROM_DEVICE:
*data_dir = FSF_DATADIR_READ;
break;
case DMA_TO_DEVICE:
*data_dir = FSF_DATADIR_WRITE;
break;
case DMA_BIDIRECTIONAL:
return -EINVAL;
}
break;
case SCSI_PROT_READ_STRIP:
*data_dir = FSF_DATADIR_DIF_READ_STRIP;
break;
case SCSI_PROT_WRITE_INSERT:
*data_dir = FSF_DATADIR_DIF_WRITE_INSERT;
break;
case SCSI_PROT_READ_PASS:
*data_dir = FSF_DATADIR_DIF_READ_CONVERT;
break;
case SCSI_PROT_WRITE_PASS:
*data_dir = FSF_DATADIR_DIF_WRITE_CONVERT;
break;
default:
return -EINVAL;
}
return 0;
}
/**
* zfcp_fsf_fcp_cmnd - initiate an FCP command (for a SCSI command)
* @scsi_cmnd: scsi command to be sent
*/
int zfcp_fsf_fcp_cmnd(struct scsi_cmnd *scsi_cmnd)
{
struct zfcp_fsf_req *req;
struct fcp_cmnd *fcp_cmnd;
u8 sbtype = SBAL_SFLAGS0_TYPE_READ;
int retval = -EIO;
struct scsi_device *sdev = scsi_cmnd->device;
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
struct zfcp_qdio *qdio = adapter->qdio;
struct fsf_qtcb_bottom_io *io;
unsigned long flags;
if (unlikely(!(atomic_read(&zfcp_sdev->status) &
ZFCP_STATUS_COMMON_UNBLOCKED)))
return -EBUSY;
spin_lock_irqsave(&qdio->req_q_lock, flags);
if (atomic_read(&qdio->req_q_free) <= 0) {
atomic_inc(&qdio->req_q_full);
goto out;
}
if (scsi_cmnd->sc_data_direction == DMA_TO_DEVICE)
sbtype = SBAL_SFLAGS0_TYPE_WRITE;
req = zfcp_fsf_req_create(qdio, FSF_QTCB_FCP_CMND,
sbtype, adapter->pool.scsi_req);
if (IS_ERR(req)) {
retval = PTR_ERR(req);
goto out;
}
scsi_cmnd->host_scribble = (unsigned char *) req->req_id;
io = &req->qtcb->bottom.io;
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
req->data = scsi_cmnd;
req->handler = zfcp_fsf_fcp_cmnd_handler;
req->qtcb->header.lun_handle = zfcp_sdev->lun_handle;
req->qtcb->header.port_handle = zfcp_sdev->port->handle;
io->service_class = FSF_CLASS_3;
io->fcp_cmnd_length = FCP_CMND_LEN;
if (scsi_get_prot_op(scsi_cmnd) != SCSI_PROT_NORMAL) {
io->data_block_length = scsi_cmnd->device->sector_size;
io->ref_tag_value = scsi_get_lba(scsi_cmnd) & 0xFFFFFFFF;
}
if (zfcp_fsf_set_data_dir(scsi_cmnd, &io->data_direction))
goto failed_scsi_cmnd;
BUILD_BUG_ON(sizeof(struct fcp_cmnd) > FSF_FCP_CMND_SIZE);
fcp_cmnd = &req->qtcb->bottom.io.fcp_cmnd.iu;
zfcp_fc_scsi_to_fcp(fcp_cmnd, scsi_cmnd);
if ((scsi_get_prot_op(scsi_cmnd) != SCSI_PROT_NORMAL) &&
scsi_prot_sg_count(scsi_cmnd)) {
zfcp_qdio_set_data_div(qdio, &req->qdio_req,
scsi_prot_sg_count(scsi_cmnd));
retval = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req,
scsi_prot_sglist(scsi_cmnd));
if (retval)
goto failed_scsi_cmnd;
io->prot_data_length = zfcp_qdio_real_bytes(
scsi_prot_sglist(scsi_cmnd));
}
retval = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req,
scsi_sglist(scsi_cmnd));
if (unlikely(retval))
goto failed_scsi_cmnd;
zfcp_qdio_set_sbale_last(adapter->qdio, &req->qdio_req);
if (zfcp_adapter_multi_buffer_active(adapter))
zfcp_qdio_set_scount(qdio, &req->qdio_req);
retval = zfcp_fsf_req_send(req);
if (unlikely(retval))
goto failed_scsi_cmnd;
/* NOTE: DO NOT TOUCH req PAST THIS POINT! */
goto out;
failed_scsi_cmnd:
zfcp_fsf_req_free(req);
scsi_cmnd->host_scribble = NULL;
out:
spin_unlock_irqrestore(&qdio->req_q_lock, flags);
return retval;
}
static void zfcp_fsf_fcp_task_mgmt_handler(struct zfcp_fsf_req *req)
{
struct scsi_device *sdev = req->data;
struct fcp_resp_with_ext *fcp_rsp;
struct fcp_resp_rsp_info *rsp_info;
zfcp_fsf_fcp_handler_common(req, sdev);
fcp_rsp = &req->qtcb->bottom.io.fcp_rsp.iu;
rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
if ((rsp_info->rsp_code != FCP_TMF_CMPL) ||
(req->status & ZFCP_STATUS_FSFREQ_ERROR))
req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
}
/**
* zfcp_fsf_fcp_task_mgmt() - Send SCSI task management command (TMF).
* @sdev: Pointer to SCSI device to send the task management command to.
* @tm_flags: Unsigned byte for task management flags.
*
* Return: On success pointer to struct zfcp_fsf_req, %NULL otherwise.
*/
struct zfcp_fsf_req *zfcp_fsf_fcp_task_mgmt(struct scsi_device *sdev,
u8 tm_flags)
{
struct zfcp_fsf_req *req = NULL;
struct fcp_cmnd *fcp_cmnd;
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
struct zfcp_qdio *qdio = zfcp_sdev->port->adapter->qdio;
if (unlikely(!(atomic_read(&zfcp_sdev->status) &
ZFCP_STATUS_COMMON_UNBLOCKED)))
return NULL;
spin_lock_irq(&qdio->req_q_lock);
if (zfcp_qdio_sbal_get(qdio))
goto out;
req = zfcp_fsf_req_create(qdio, FSF_QTCB_FCP_CMND,
SBAL_SFLAGS0_TYPE_WRITE,
qdio->adapter->pool.scsi_req);
if (IS_ERR(req)) {
req = NULL;
goto out;
}
req->data = sdev;
req->handler = zfcp_fsf_fcp_task_mgmt_handler;
req->qtcb->header.lun_handle = zfcp_sdev->lun_handle;
req->qtcb->header.port_handle = zfcp_sdev->port->handle;
req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
req->qtcb->bottom.io.service_class = FSF_CLASS_3;
req->qtcb->bottom.io.fcp_cmnd_length = FCP_CMND_LEN;
zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
fcp_cmnd = &req->qtcb->bottom.io.fcp_cmnd.iu;
zfcp_fc_fcp_tm(fcp_cmnd, sdev, tm_flags);
zfcp_fsf_start_timer(req, ZFCP_FSF_SCSI_ER_TIMEOUT);
if (!zfcp_fsf_req_send(req)) {
/* NOTE: DO NOT TOUCH req, UNTIL IT COMPLETES! */
goto out;
}
zfcp_fsf_req_free(req);
req = NULL;
out:
spin_unlock_irq(&qdio->req_q_lock);
return req;
}
/**
* zfcp_fsf_reqid_check - validate req_id contained in SBAL returned by QDIO
* @qdio: pointer to struct zfcp_qdio
* @sbal_idx: response queue index of SBAL to be processed
*/
void zfcp_fsf_reqid_check(struct zfcp_qdio *qdio, int sbal_idx)
{
struct zfcp_adapter *adapter = qdio->adapter;
struct qdio_buffer *sbal = qdio->res_q[sbal_idx];
struct qdio_buffer_element *sbale;
struct zfcp_fsf_req *fsf_req;
unsigned long req_id;
int idx;
for (idx = 0; idx < QDIO_MAX_ELEMENTS_PER_BUFFER; idx++) {
sbale = &sbal->element[idx];
req_id = (unsigned long) sbale->addr;
fsf_req = zfcp_reqlist_find_rm(adapter->req_list, req_id);
if (!fsf_req) {
/*
* Unknown request means that we have potentially memory
* corruption and must stop the machine immediately.
*/
zfcp_qdio_siosl(adapter);
panic("error: unknown req_id (%lx) on adapter %s.\n",
req_id, dev_name(&adapter->ccw_device->dev));
}
zfcp_fsf_req_complete(fsf_req);
if (likely(sbale->eflags & SBAL_EFLAGS_LAST_ENTRY))
break;
}
}
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