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![Steffen Maier](/assets/img/avatar_default.png)
Suppose more than one non-NPIV FCP device is active on the same channel.
Send I/O to storage and have some of the pending I/O run into a SCSI
command timeout, e.g. due to bit errors on the fibre. Now the error
situation stops. However, we saw FCP requests continue to timeout in the
channel. The abort will be successful, but the subsequent TUR fails.
Scsi_eh starts. The LUN reset fails. The target reset fails. The host
reset only did an FCP device recovery. However, for non-NPIV FCP devices,
this does not close and reopen ports on the SAN-side if other non-NPIV FCP
device(s) share the same open ports.
In order to resolve the continuing FCP request timeouts, we need to
explicitly close and reopen ports on the SAN-side.
This was missing since the beginning of zfcp in v2.6.0 history commit
ea127f975424 ("[PATCH] s390 (7/7): zfcp host adapter.").
Note: The FSF requests for forced port reopen could run into FSF request
timeouts due to other reasons. This would trigger an internal FCP device
recovery. Pending forced port reopen recoveries would get dismissed. So
some ports might not get fully reopened during this host reset handler.
However, subsequent I/O would trigger the above described escalation and
eventually all ports would be forced reopen to resolve any continuing FCP
request timeouts due to earlier bit errors.
Signed-off-by: Steffen Maier <maier@linux.ibm.com>
Fixes: 1da177e4c3
("Linux-2.6.12-rc2")
Cc: <stable@vger.kernel.org> #3.0+
Reviewed-by: Jens Remus <jremus@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
866 lines
25 KiB
C
866 lines
25 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* zfcp device driver
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*
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* Interface to Linux SCSI midlayer.
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*
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* Copyright IBM Corp. 2002, 2018
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*/
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#define KMSG_COMPONENT "zfcp"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <scsi/fc/fc_fcp.h>
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#include <scsi/scsi_eh.h>
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#include <linux/atomic.h>
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#include "zfcp_ext.h"
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#include "zfcp_dbf.h"
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#include "zfcp_fc.h"
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#include "zfcp_reqlist.h"
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static unsigned int default_depth = 32;
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module_param_named(queue_depth, default_depth, uint, 0600);
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MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
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static bool enable_dif;
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module_param_named(dif, enable_dif, bool, 0400);
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MODULE_PARM_DESC(dif, "Enable DIF data integrity support (default off)");
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bool zfcp_experimental_dix;
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module_param_named(dix, zfcp_experimental_dix, bool, 0400);
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MODULE_PARM_DESC(dix, "Enable experimental DIX (data integrity extension) support which implies DIF support (default off)");
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static bool allow_lun_scan = true;
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module_param(allow_lun_scan, bool, 0600);
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MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs");
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static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
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{
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struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
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/* if previous slave_alloc returned early, there is nothing to do */
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if (!zfcp_sdev->port)
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return;
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zfcp_erp_lun_shutdown_wait(sdev, "scssd_1");
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put_device(&zfcp_sdev->port->dev);
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}
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static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
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{
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if (sdp->tagged_supported)
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scsi_change_queue_depth(sdp, default_depth);
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return 0;
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}
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static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
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{
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set_host_byte(scpnt, result);
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zfcp_dbf_scsi_fail_send(scpnt);
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scpnt->scsi_done(scpnt);
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}
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static
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int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt)
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{
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struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
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struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
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int status, scsi_result, ret;
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/* reset the status for this request */
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scpnt->result = 0;
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scpnt->host_scribble = NULL;
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scsi_result = fc_remote_port_chkready(rport);
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if (unlikely(scsi_result)) {
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scpnt->result = scsi_result;
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zfcp_dbf_scsi_fail_send(scpnt);
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scpnt->scsi_done(scpnt);
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return 0;
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}
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status = atomic_read(&zfcp_sdev->status);
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if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
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!(atomic_read(&zfcp_sdev->port->status) &
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ZFCP_STATUS_COMMON_ERP_FAILED)) {
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/* only LUN access denied, but port is good
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* not covered by FC transport, have to fail here */
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zfcp_scsi_command_fail(scpnt, DID_ERROR);
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return 0;
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}
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if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
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/* This could be
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* call to rport_delete pending: mimic retry from
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* fc_remote_port_chkready until rport is BLOCKED
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*/
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zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
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return 0;
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}
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ret = zfcp_fsf_fcp_cmnd(scpnt);
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if (unlikely(ret == -EBUSY))
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return SCSI_MLQUEUE_DEVICE_BUSY;
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else if (unlikely(ret < 0))
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return SCSI_MLQUEUE_HOST_BUSY;
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return ret;
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}
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static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
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{
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struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
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struct zfcp_adapter *adapter =
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(struct zfcp_adapter *) sdev->host->hostdata[0];
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struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
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struct zfcp_port *port;
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struct zfcp_unit *unit;
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int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
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zfcp_sdev->erp_action.adapter = adapter;
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zfcp_sdev->erp_action.sdev = sdev;
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port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
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if (!port)
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return -ENXIO;
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zfcp_sdev->erp_action.port = port;
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unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
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if (unit)
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put_device(&unit->dev);
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if (!unit && !(allow_lun_scan && npiv)) {
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put_device(&port->dev);
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return -ENXIO;
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}
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zfcp_sdev->port = port;
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zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
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zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
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zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
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zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
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zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
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zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
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spin_lock_init(&zfcp_sdev->latencies.lock);
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zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
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zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
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zfcp_erp_wait(port->adapter);
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return 0;
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}
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static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
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{
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struct Scsi_Host *scsi_host = scpnt->device->host;
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struct zfcp_adapter *adapter =
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(struct zfcp_adapter *) scsi_host->hostdata[0];
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struct zfcp_fsf_req *old_req, *abrt_req;
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unsigned long flags;
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unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
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int retval = SUCCESS, ret;
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int retry = 3;
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char *dbf_tag;
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/* avoid race condition between late normal completion and abort */
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write_lock_irqsave(&adapter->abort_lock, flags);
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old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
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if (!old_req) {
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write_unlock_irqrestore(&adapter->abort_lock, flags);
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zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
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return FAILED; /* completion could be in progress */
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}
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old_req->data = NULL;
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/* don't access old fsf_req after releasing the abort_lock */
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write_unlock_irqrestore(&adapter->abort_lock, flags);
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while (retry--) {
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abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
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if (abrt_req)
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break;
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zfcp_dbf_scsi_abort("abrt_wt", scpnt, NULL);
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zfcp_erp_wait(adapter);
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ret = fc_block_scsi_eh(scpnt);
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if (ret) {
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zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
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return ret;
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}
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if (!(atomic_read(&adapter->status) &
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ZFCP_STATUS_COMMON_RUNNING)) {
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zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
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return SUCCESS;
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}
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}
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if (!abrt_req) {
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zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
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return FAILED;
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}
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wait_for_completion(&abrt_req->completion);
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if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
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dbf_tag = "abrt_ok";
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else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
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dbf_tag = "abrt_nn";
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else {
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dbf_tag = "abrt_fa";
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retval = FAILED;
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}
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zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
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zfcp_fsf_req_free(abrt_req);
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return retval;
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}
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struct zfcp_scsi_req_filter {
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u8 tmf_scope;
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u32 lun_handle;
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u32 port_handle;
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};
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static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data)
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{
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struct zfcp_scsi_req_filter *filter =
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(struct zfcp_scsi_req_filter *)data;
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/* already aborted - prevent side-effects - or not a SCSI command */
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if (old_req->data == NULL ||
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zfcp_fsf_req_is_status_read_buffer(old_req) ||
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old_req->qtcb->header.fsf_command != FSF_QTCB_FCP_CMND)
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return;
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/* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */
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if (old_req->qtcb->header.port_handle != filter->port_handle)
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return;
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if (filter->tmf_scope == FCP_TMF_LUN_RESET &&
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old_req->qtcb->header.lun_handle != filter->lun_handle)
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return;
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zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req);
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old_req->data = NULL;
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}
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static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
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{
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struct zfcp_adapter *adapter = zsdev->port->adapter;
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struct zfcp_scsi_req_filter filter = {
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.tmf_scope = FCP_TMF_TGT_RESET,
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.port_handle = zsdev->port->handle,
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};
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unsigned long flags;
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if (tm_flags == FCP_TMF_LUN_RESET) {
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filter.tmf_scope = FCP_TMF_LUN_RESET;
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filter.lun_handle = zsdev->lun_handle;
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}
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/*
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* abort_lock secures against other processings - in the abort-function
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* and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
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*/
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write_lock_irqsave(&adapter->abort_lock, flags);
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zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
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&filter);
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write_unlock_irqrestore(&adapter->abort_lock, flags);
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}
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/**
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* zfcp_scsi_task_mgmt_function() - Send a task management function (sync).
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* @sdev: Pointer to SCSI device to send the task management command to.
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* @tm_flags: Task management flags,
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* here we only handle %FCP_TMF_TGT_RESET or %FCP_TMF_LUN_RESET.
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*/
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static int zfcp_scsi_task_mgmt_function(struct scsi_device *sdev, u8 tm_flags)
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{
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struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
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struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
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struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
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struct zfcp_fsf_req *fsf_req = NULL;
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int retval = SUCCESS, ret;
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int retry = 3;
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while (retry--) {
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fsf_req = zfcp_fsf_fcp_task_mgmt(sdev, tm_flags);
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if (fsf_req)
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break;
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zfcp_dbf_scsi_devreset("wait", sdev, tm_flags, NULL);
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zfcp_erp_wait(adapter);
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ret = fc_block_rport(rport);
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if (ret) {
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zfcp_dbf_scsi_devreset("fiof", sdev, tm_flags, NULL);
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return ret;
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}
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if (!(atomic_read(&adapter->status) &
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ZFCP_STATUS_COMMON_RUNNING)) {
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zfcp_dbf_scsi_devreset("nres", sdev, tm_flags, NULL);
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return SUCCESS;
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}
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}
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if (!fsf_req) {
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zfcp_dbf_scsi_devreset("reqf", sdev, tm_flags, NULL);
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return FAILED;
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}
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wait_for_completion(&fsf_req->completion);
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if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
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zfcp_dbf_scsi_devreset("fail", sdev, tm_flags, fsf_req);
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retval = FAILED;
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} else {
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zfcp_dbf_scsi_devreset("okay", sdev, tm_flags, fsf_req);
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zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
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}
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zfcp_fsf_req_free(fsf_req);
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return retval;
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}
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static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
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{
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struct scsi_device *sdev = scpnt->device;
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return zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_LUN_RESET);
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}
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static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
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{
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struct scsi_target *starget = scsi_target(scpnt->device);
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struct fc_rport *rport = starget_to_rport(starget);
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struct Scsi_Host *shost = rport_to_shost(rport);
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struct scsi_device *sdev = NULL, *tmp_sdev;
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struct zfcp_adapter *adapter =
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(struct zfcp_adapter *)shost->hostdata[0];
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int ret;
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shost_for_each_device(tmp_sdev, shost) {
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if (tmp_sdev->id == starget->id) {
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sdev = tmp_sdev;
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break;
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}
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}
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if (!sdev) {
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ret = FAILED;
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zfcp_dbf_scsi_eh("tr_nosd", adapter, starget->id, ret);
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return ret;
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}
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ret = zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_TGT_RESET);
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/* release reference from above shost_for_each_device */
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if (sdev)
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scsi_device_put(tmp_sdev);
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return ret;
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}
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static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
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{
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struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
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struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
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int ret = SUCCESS, fc_ret;
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if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE)) {
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zfcp_erp_port_forced_reopen_all(adapter, 0, "schrh_p");
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zfcp_erp_wait(adapter);
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}
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zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
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zfcp_erp_wait(adapter);
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fc_ret = fc_block_scsi_eh(scpnt);
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if (fc_ret)
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ret = fc_ret;
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zfcp_dbf_scsi_eh("schrh_r", adapter, ~0, ret);
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return ret;
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}
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/**
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* zfcp_scsi_sysfs_host_reset() - Support scsi_host sysfs attribute host_reset.
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* @shost: Pointer to Scsi_Host to perform action on.
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* @reset_type: We support %SCSI_ADAPTER_RESET but not %SCSI_FIRMWARE_RESET.
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*
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* Return: 0 on %SCSI_ADAPTER_RESET, -%EOPNOTSUPP otherwise.
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*
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* This is similar to zfcp_sysfs_adapter_failed_store().
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*/
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static int zfcp_scsi_sysfs_host_reset(struct Scsi_Host *shost, int reset_type)
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{
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struct zfcp_adapter *adapter =
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(struct zfcp_adapter *)shost->hostdata[0];
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int ret = 0;
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if (reset_type != SCSI_ADAPTER_RESET) {
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ret = -EOPNOTSUPP;
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zfcp_dbf_scsi_eh("scshr_n", adapter, ~0, ret);
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return ret;
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}
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zfcp_erp_adapter_reset_sync(adapter, "scshr_y");
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return ret;
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}
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struct scsi_transport_template *zfcp_scsi_transport_template;
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static struct scsi_host_template zfcp_scsi_host_template = {
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.module = THIS_MODULE,
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.name = "zfcp",
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.queuecommand = zfcp_scsi_queuecommand,
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.eh_timed_out = fc_eh_timed_out,
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.eh_abort_handler = zfcp_scsi_eh_abort_handler,
|
|
.eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
|
|
.eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
|
|
.eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler,
|
|
.slave_alloc = zfcp_scsi_slave_alloc,
|
|
.slave_configure = zfcp_scsi_slave_configure,
|
|
.slave_destroy = zfcp_scsi_slave_destroy,
|
|
.change_queue_depth = scsi_change_queue_depth,
|
|
.host_reset = zfcp_scsi_sysfs_host_reset,
|
|
.proc_name = "zfcp",
|
|
.can_queue = 4096,
|
|
.this_id = -1,
|
|
.sg_tablesize = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
|
|
* ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
|
|
/* GCD, adjusted later */
|
|
.max_sectors = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
|
|
* ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
|
|
/* GCD, adjusted later */
|
|
/* report size limit per scatter-gather segment */
|
|
.max_segment_size = ZFCP_QDIO_SBALE_LEN,
|
|
.dma_boundary = ZFCP_QDIO_SBALE_LEN - 1,
|
|
.shost_attrs = zfcp_sysfs_shost_attrs,
|
|
.sdev_attrs = zfcp_sysfs_sdev_attrs,
|
|
.track_queue_depth = 1,
|
|
.supported_mode = MODE_INITIATOR,
|
|
};
|
|
|
|
/**
|
|
* zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
|
|
* @adapter: The zfcp adapter to register with the SCSI midlayer
|
|
*/
|
|
int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
|
|
{
|
|
struct ccw_dev_id dev_id;
|
|
|
|
if (adapter->scsi_host)
|
|
return 0;
|
|
|
|
ccw_device_get_id(adapter->ccw_device, &dev_id);
|
|
/* register adapter as SCSI host with mid layer of SCSI stack */
|
|
adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
|
|
sizeof (struct zfcp_adapter *));
|
|
if (!adapter->scsi_host) {
|
|
dev_err(&adapter->ccw_device->dev,
|
|
"Registering the FCP device with the "
|
|
"SCSI stack failed\n");
|
|
return -EIO;
|
|
}
|
|
|
|
/* tell the SCSI stack some characteristics of this adapter */
|
|
adapter->scsi_host->max_id = 511;
|
|
adapter->scsi_host->max_lun = 0xFFFFFFFF;
|
|
adapter->scsi_host->max_channel = 0;
|
|
adapter->scsi_host->unique_id = dev_id.devno;
|
|
adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
|
|
adapter->scsi_host->transportt = zfcp_scsi_transport_template;
|
|
|
|
adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
|
|
|
|
if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
|
|
scsi_host_put(adapter->scsi_host);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
|
|
* @adapter: The zfcp adapter to unregister.
|
|
*/
|
|
void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
|
|
{
|
|
struct Scsi_Host *shost;
|
|
struct zfcp_port *port;
|
|
|
|
shost = adapter->scsi_host;
|
|
if (!shost)
|
|
return;
|
|
|
|
read_lock_irq(&adapter->port_list_lock);
|
|
list_for_each_entry(port, &adapter->port_list, list)
|
|
port->rport = NULL;
|
|
read_unlock_irq(&adapter->port_list_lock);
|
|
|
|
fc_remove_host(shost);
|
|
scsi_remove_host(shost);
|
|
scsi_host_put(shost);
|
|
adapter->scsi_host = NULL;
|
|
}
|
|
|
|
static struct fc_host_statistics*
|
|
zfcp_scsi_init_fc_host_stats(struct zfcp_adapter *adapter)
|
|
{
|
|
struct fc_host_statistics *fc_stats;
|
|
|
|
if (!adapter->fc_stats) {
|
|
fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
|
|
if (!fc_stats)
|
|
return NULL;
|
|
adapter->fc_stats = fc_stats; /* freed in adapter_release */
|
|
}
|
|
memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
|
|
return adapter->fc_stats;
|
|
}
|
|
|
|
static void zfcp_scsi_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
|
|
struct fsf_qtcb_bottom_port *data,
|
|
struct fsf_qtcb_bottom_port *old)
|
|
{
|
|
fc_stats->seconds_since_last_reset =
|
|
data->seconds_since_last_reset - old->seconds_since_last_reset;
|
|
fc_stats->tx_frames = data->tx_frames - old->tx_frames;
|
|
fc_stats->tx_words = data->tx_words - old->tx_words;
|
|
fc_stats->rx_frames = data->rx_frames - old->rx_frames;
|
|
fc_stats->rx_words = data->rx_words - old->rx_words;
|
|
fc_stats->lip_count = data->lip - old->lip;
|
|
fc_stats->nos_count = data->nos - old->nos;
|
|
fc_stats->error_frames = data->error_frames - old->error_frames;
|
|
fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
|
|
fc_stats->link_failure_count = data->link_failure - old->link_failure;
|
|
fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
|
|
fc_stats->loss_of_signal_count =
|
|
data->loss_of_signal - old->loss_of_signal;
|
|
fc_stats->prim_seq_protocol_err_count =
|
|
data->psp_error_counts - old->psp_error_counts;
|
|
fc_stats->invalid_tx_word_count =
|
|
data->invalid_tx_words - old->invalid_tx_words;
|
|
fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
|
|
fc_stats->fcp_input_requests =
|
|
data->input_requests - old->input_requests;
|
|
fc_stats->fcp_output_requests =
|
|
data->output_requests - old->output_requests;
|
|
fc_stats->fcp_control_requests =
|
|
data->control_requests - old->control_requests;
|
|
fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
|
|
fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
|
|
}
|
|
|
|
static void zfcp_scsi_set_fc_host_stats(struct fc_host_statistics *fc_stats,
|
|
struct fsf_qtcb_bottom_port *data)
|
|
{
|
|
fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
|
|
fc_stats->tx_frames = data->tx_frames;
|
|
fc_stats->tx_words = data->tx_words;
|
|
fc_stats->rx_frames = data->rx_frames;
|
|
fc_stats->rx_words = data->rx_words;
|
|
fc_stats->lip_count = data->lip;
|
|
fc_stats->nos_count = data->nos;
|
|
fc_stats->error_frames = data->error_frames;
|
|
fc_stats->dumped_frames = data->dumped_frames;
|
|
fc_stats->link_failure_count = data->link_failure;
|
|
fc_stats->loss_of_sync_count = data->loss_of_sync;
|
|
fc_stats->loss_of_signal_count = data->loss_of_signal;
|
|
fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
|
|
fc_stats->invalid_tx_word_count = data->invalid_tx_words;
|
|
fc_stats->invalid_crc_count = data->invalid_crcs;
|
|
fc_stats->fcp_input_requests = data->input_requests;
|
|
fc_stats->fcp_output_requests = data->output_requests;
|
|
fc_stats->fcp_control_requests = data->control_requests;
|
|
fc_stats->fcp_input_megabytes = data->input_mb;
|
|
fc_stats->fcp_output_megabytes = data->output_mb;
|
|
}
|
|
|
|
static struct fc_host_statistics *
|
|
zfcp_scsi_get_fc_host_stats(struct Scsi_Host *host)
|
|
{
|
|
struct zfcp_adapter *adapter;
|
|
struct fc_host_statistics *fc_stats;
|
|
struct fsf_qtcb_bottom_port *data;
|
|
int ret;
|
|
|
|
adapter = (struct zfcp_adapter *)host->hostdata[0];
|
|
fc_stats = zfcp_scsi_init_fc_host_stats(adapter);
|
|
if (!fc_stats)
|
|
return NULL;
|
|
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return NULL;
|
|
|
|
ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
|
|
if (ret) {
|
|
kfree(data);
|
|
return NULL;
|
|
}
|
|
|
|
if (adapter->stats_reset &&
|
|
((jiffies/HZ - adapter->stats_reset) <
|
|
data->seconds_since_last_reset))
|
|
zfcp_scsi_adjust_fc_host_stats(fc_stats, data,
|
|
adapter->stats_reset_data);
|
|
else
|
|
zfcp_scsi_set_fc_host_stats(fc_stats, data);
|
|
|
|
kfree(data);
|
|
return fc_stats;
|
|
}
|
|
|
|
static void zfcp_scsi_reset_fc_host_stats(struct Scsi_Host *shost)
|
|
{
|
|
struct zfcp_adapter *adapter;
|
|
struct fsf_qtcb_bottom_port *data;
|
|
int ret;
|
|
|
|
adapter = (struct zfcp_adapter *)shost->hostdata[0];
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return;
|
|
|
|
ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
|
|
if (ret)
|
|
kfree(data);
|
|
else {
|
|
adapter->stats_reset = jiffies/HZ;
|
|
kfree(adapter->stats_reset_data);
|
|
adapter->stats_reset_data = data; /* finally freed in
|
|
adapter_release */
|
|
}
|
|
}
|
|
|
|
static void zfcp_scsi_get_host_port_state(struct Scsi_Host *shost)
|
|
{
|
|
struct zfcp_adapter *adapter =
|
|
(struct zfcp_adapter *)shost->hostdata[0];
|
|
int status = atomic_read(&adapter->status);
|
|
|
|
if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
|
|
!(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
|
|
fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
|
|
else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
|
|
fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
|
|
else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
|
|
fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
|
|
else
|
|
fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
|
|
}
|
|
|
|
static void zfcp_scsi_set_rport_dev_loss_tmo(struct fc_rport *rport,
|
|
u32 timeout)
|
|
{
|
|
rport->dev_loss_tmo = timeout;
|
|
}
|
|
|
|
/**
|
|
* zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
|
|
* @rport: The FC rport where to teminate I/O
|
|
*
|
|
* Abort all pending SCSI commands for a port by closing the
|
|
* port. Using a reopen avoids a conflict with a shutdown
|
|
* overwriting a reopen. The "forced" ensures that a disappeared port
|
|
* is not opened again as valid due to the cached plogi data in
|
|
* non-NPIV mode.
|
|
*/
|
|
static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
|
|
{
|
|
struct zfcp_port *port;
|
|
struct Scsi_Host *shost = rport_to_shost(rport);
|
|
struct zfcp_adapter *adapter =
|
|
(struct zfcp_adapter *)shost->hostdata[0];
|
|
|
|
port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
|
|
|
|
if (port) {
|
|
zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
|
|
put_device(&port->dev);
|
|
} else {
|
|
zfcp_erp_port_forced_no_port_dbf(
|
|
"sctrpin", adapter,
|
|
rport->port_name /* zfcp_scsi_rport_register */,
|
|
rport->port_id /* zfcp_scsi_rport_register */);
|
|
}
|
|
}
|
|
|
|
static void zfcp_scsi_rport_register(struct zfcp_port *port)
|
|
{
|
|
struct fc_rport_identifiers ids;
|
|
struct fc_rport *rport;
|
|
|
|
if (port->rport)
|
|
return;
|
|
|
|
ids.node_name = port->wwnn;
|
|
ids.port_name = port->wwpn;
|
|
ids.port_id = port->d_id;
|
|
ids.roles = FC_RPORT_ROLE_FCP_TARGET;
|
|
|
|
zfcp_dbf_rec_trig_lock("scpaddy", port->adapter, port, NULL,
|
|
ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
|
|
ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
|
|
rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
|
|
if (!rport) {
|
|
dev_err(&port->adapter->ccw_device->dev,
|
|
"Registering port 0x%016Lx failed\n",
|
|
(unsigned long long)port->wwpn);
|
|
return;
|
|
}
|
|
|
|
rport->maxframe_size = port->maxframe_size;
|
|
rport->supported_classes = port->supported_classes;
|
|
port->rport = rport;
|
|
port->starget_id = rport->scsi_target_id;
|
|
|
|
zfcp_unit_queue_scsi_scan(port);
|
|
}
|
|
|
|
static void zfcp_scsi_rport_block(struct zfcp_port *port)
|
|
{
|
|
struct fc_rport *rport = port->rport;
|
|
|
|
if (rport) {
|
|
zfcp_dbf_rec_trig_lock("scpdely", port->adapter, port, NULL,
|
|
ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
|
|
ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
|
|
fc_remote_port_delete(rport);
|
|
port->rport = NULL;
|
|
}
|
|
}
|
|
|
|
void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
|
|
{
|
|
get_device(&port->dev);
|
|
port->rport_task = RPORT_ADD;
|
|
|
|
if (!queue_work(port->adapter->work_queue, &port->rport_work))
|
|
put_device(&port->dev);
|
|
}
|
|
|
|
void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
|
|
{
|
|
get_device(&port->dev);
|
|
port->rport_task = RPORT_DEL;
|
|
|
|
if (port->rport && queue_work(port->adapter->work_queue,
|
|
&port->rport_work))
|
|
return;
|
|
|
|
put_device(&port->dev);
|
|
}
|
|
|
|
void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
|
|
{
|
|
unsigned long flags;
|
|
struct zfcp_port *port;
|
|
|
|
read_lock_irqsave(&adapter->port_list_lock, flags);
|
|
list_for_each_entry(port, &adapter->port_list, list)
|
|
zfcp_scsi_schedule_rport_block(port);
|
|
read_unlock_irqrestore(&adapter->port_list_lock, flags);
|
|
}
|
|
|
|
void zfcp_scsi_rport_work(struct work_struct *work)
|
|
{
|
|
struct zfcp_port *port = container_of(work, struct zfcp_port,
|
|
rport_work);
|
|
|
|
set_worker_desc("zrp%c-%16llx",
|
|
(port->rport_task == RPORT_ADD) ? 'a' : 'd',
|
|
port->wwpn); /* < WORKER_DESC_LEN=24 */
|
|
while (port->rport_task) {
|
|
if (port->rport_task == RPORT_ADD) {
|
|
port->rport_task = RPORT_NONE;
|
|
zfcp_scsi_rport_register(port);
|
|
} else {
|
|
port->rport_task = RPORT_NONE;
|
|
zfcp_scsi_rport_block(port);
|
|
}
|
|
}
|
|
|
|
put_device(&port->dev);
|
|
}
|
|
|
|
/**
|
|
* zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
|
|
* @adapter: The adapter where to configure DIF/DIX for the SCSI host
|
|
*/
|
|
void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
|
|
{
|
|
unsigned int mask = 0;
|
|
unsigned int data_div;
|
|
struct Scsi_Host *shost = adapter->scsi_host;
|
|
|
|
data_div = atomic_read(&adapter->status) &
|
|
ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
|
|
|
|
if ((enable_dif || zfcp_experimental_dix) &&
|
|
adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
|
|
mask |= SHOST_DIF_TYPE1_PROTECTION;
|
|
|
|
if (zfcp_experimental_dix && data_div &&
|
|
adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
|
|
mask |= SHOST_DIX_TYPE1_PROTECTION;
|
|
scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
|
|
shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
|
|
shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
|
|
shost->max_sectors = shost->sg_tablesize * 8;
|
|
}
|
|
|
|
scsi_host_set_prot(shost, mask);
|
|
}
|
|
|
|
/**
|
|
* zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
|
|
* @scmd: The SCSI command to report the error for
|
|
* @ascq: The ASCQ to put in the sense buffer
|
|
*
|
|
* See the error handling in sd_done for the sense codes used here.
|
|
* Set DID_SOFT_ERROR to retry the request, if possible.
|
|
*/
|
|
void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
|
|
{
|
|
scsi_build_sense_buffer(1, scmd->sense_buffer,
|
|
ILLEGAL_REQUEST, 0x10, ascq);
|
|
set_driver_byte(scmd, DRIVER_SENSE);
|
|
scmd->result |= SAM_STAT_CHECK_CONDITION;
|
|
set_host_byte(scmd, DID_SOFT_ERROR);
|
|
}
|
|
|
|
struct fc_function_template zfcp_transport_functions = {
|
|
.show_starget_port_id = 1,
|
|
.show_starget_port_name = 1,
|
|
.show_starget_node_name = 1,
|
|
.show_rport_supported_classes = 1,
|
|
.show_rport_maxframe_size = 1,
|
|
.show_rport_dev_loss_tmo = 1,
|
|
.show_host_node_name = 1,
|
|
.show_host_port_name = 1,
|
|
.show_host_permanent_port_name = 1,
|
|
.show_host_supported_classes = 1,
|
|
.show_host_supported_fc4s = 1,
|
|
.show_host_supported_speeds = 1,
|
|
.show_host_maxframe_size = 1,
|
|
.show_host_serial_number = 1,
|
|
.get_fc_host_stats = zfcp_scsi_get_fc_host_stats,
|
|
.reset_fc_host_stats = zfcp_scsi_reset_fc_host_stats,
|
|
.set_rport_dev_loss_tmo = zfcp_scsi_set_rport_dev_loss_tmo,
|
|
.get_host_port_state = zfcp_scsi_get_host_port_state,
|
|
.terminate_rport_io = zfcp_scsi_terminate_rport_io,
|
|
.show_host_port_state = 1,
|
|
.show_host_active_fc4s = 1,
|
|
.bsg_request = zfcp_fc_exec_bsg_job,
|
|
.bsg_timeout = zfcp_fc_timeout_bsg_job,
|
|
/* no functions registered for following dynamic attributes but
|
|
directly set by LLDD */
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|
.show_host_port_type = 1,
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|
.show_host_symbolic_name = 1,
|
|
.show_host_speed = 1,
|
|
.show_host_port_id = 1,
|
|
.dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
|
|
};
|