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![Steffen Maier](/assets/img/avatar_default.png)
If an incoming ELS of type RSCN contains more than one element, zfcp suboptimally causes repeated erp trigger NOP trace records for each previously failed port. These could be ports that went away. It loops over each RSCN element, and for each of those in an inner loop over all zfcp_ports. The trigger to recover failed ports should be just the reception of some RSCN, no matter how many elements it has. So we can loop over failed ports separately, and only then loop over each RSCN element to handle the non-failed ports. The call chain was: zfcp_fc_incoming_rscn for (i = 1; i < no_entries; i++) _zfcp_fc_incoming_rscn list_for_each_entry(port, &adapter->port_list, list) if (masked port->d_id match) zfcp_fc_test_link if (!port->d_id) zfcp_erp_port_reopen "fcrscn1" <=== In order the reduce the "flooding" of the REC trace area in such cases, we factor out handling the failed ports to be outside of the entries loop: zfcp_fc_incoming_rscn if (no_entries > 1) <=== list_for_each_entry(port, &adapter->port_list, list) <=== if (!port->d_id) zfcp_erp_port_reopen "fcrscn1" <=== for (i = 1; i < no_entries; i++) _zfcp_fc_incoming_rscn list_for_each_entry(port, &adapter->port_list, list) if (masked port->d_id match) zfcp_fc_test_link Abbreviated example trace records before this code change: Tag : fcrscn1 WWPN : 0x500507630310d327 ERP want : 0x02 ERP need : 0x02 Tag : fcrscn1 WWPN : 0x500507630310d327 ERP want : 0x02 ERP need : 0x00 NOP => superfluous trace record The last trace entry repeats if there are more than 2 RSCN elements. Signed-off-by: Steffen Maier <maier@linux.ibm.com> Reviewed-by: Benjamin Block <bblock@linux.ibm.com> Reviewed-by: Jens Remus <jremus@linux.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
1104 lines
30 KiB
C
1104 lines
30 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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* Fibre Channel related functions for the zfcp device driver.
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*
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* Copyright IBM Corp. 2008, 2017
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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/types.h>
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#include <linux/slab.h>
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#include <linux/utsname.h>
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#include <linux/random.h>
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#include <linux/bsg-lib.h>
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#include <scsi/fc/fc_els.h>
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#include <scsi/libfc.h>
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#include "zfcp_ext.h"
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#include "zfcp_fc.h"
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struct kmem_cache *zfcp_fc_req_cache;
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static u32 zfcp_fc_rscn_range_mask[] = {
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[ELS_ADDR_FMT_PORT] = 0xFFFFFF,
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[ELS_ADDR_FMT_AREA] = 0xFFFF00,
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[ELS_ADDR_FMT_DOM] = 0xFF0000,
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[ELS_ADDR_FMT_FAB] = 0x000000,
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};
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static bool no_auto_port_rescan;
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module_param(no_auto_port_rescan, bool, 0600);
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MODULE_PARM_DESC(no_auto_port_rescan,
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"no automatic port_rescan (default off)");
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static unsigned int port_scan_backoff = 500;
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module_param(port_scan_backoff, uint, 0600);
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MODULE_PARM_DESC(port_scan_backoff,
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"upper limit of port scan random backoff in msecs (default 500)");
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static unsigned int port_scan_ratelimit = 60000;
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module_param(port_scan_ratelimit, uint, 0600);
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MODULE_PARM_DESC(port_scan_ratelimit,
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"minimum interval between port scans in msecs (default 60000)");
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unsigned int zfcp_fc_port_scan_backoff(void)
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{
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if (!port_scan_backoff)
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return 0;
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return get_random_int() % port_scan_backoff;
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}
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static void zfcp_fc_port_scan_time(struct zfcp_adapter *adapter)
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{
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unsigned long interval = msecs_to_jiffies(port_scan_ratelimit);
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unsigned long backoff = msecs_to_jiffies(zfcp_fc_port_scan_backoff());
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adapter->next_port_scan = jiffies + interval + backoff;
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}
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static void zfcp_fc_port_scan(struct zfcp_adapter *adapter)
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{
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unsigned long now = jiffies;
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unsigned long next = adapter->next_port_scan;
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unsigned long delay = 0, max;
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/* delay only needed within waiting period */
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if (time_before(now, next)) {
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delay = next - now;
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/* paranoia: never ever delay scans longer than specified */
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max = msecs_to_jiffies(port_scan_ratelimit + port_scan_backoff);
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delay = min(delay, max);
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}
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queue_delayed_work(adapter->work_queue, &adapter->scan_work, delay);
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}
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void zfcp_fc_conditional_port_scan(struct zfcp_adapter *adapter)
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{
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if (no_auto_port_rescan)
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return;
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zfcp_fc_port_scan(adapter);
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}
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void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *adapter)
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{
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if (!no_auto_port_rescan)
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return;
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zfcp_fc_port_scan(adapter);
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}
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/**
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* zfcp_fc_post_event - post event to userspace via fc_transport
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* @work: work struct with enqueued events
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*/
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void zfcp_fc_post_event(struct work_struct *work)
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{
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struct zfcp_fc_event *event = NULL, *tmp = NULL;
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LIST_HEAD(tmp_lh);
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struct zfcp_fc_events *events = container_of(work,
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struct zfcp_fc_events, work);
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struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter,
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events);
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spin_lock_bh(&events->list_lock);
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list_splice_init(&events->list, &tmp_lh);
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spin_unlock_bh(&events->list_lock);
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list_for_each_entry_safe(event, tmp, &tmp_lh, list) {
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fc_host_post_event(adapter->scsi_host, fc_get_event_number(),
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event->code, event->data);
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list_del(&event->list);
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kfree(event);
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}
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}
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/**
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* zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context
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* @adapter: The adapter where to enqueue the event
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* @event_code: The event code (as defined in fc_host_event_code in
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* scsi_transport_fc.h)
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* @event_data: The event data (e.g. n_port page in case of els)
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*/
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void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter,
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enum fc_host_event_code event_code, u32 event_data)
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{
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struct zfcp_fc_event *event;
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event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC);
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if (!event)
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return;
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event->code = event_code;
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event->data = event_data;
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spin_lock(&adapter->events.list_lock);
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list_add_tail(&event->list, &adapter->events.list);
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spin_unlock(&adapter->events.list_lock);
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queue_work(adapter->work_queue, &adapter->events.work);
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}
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static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port)
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{
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if (mutex_lock_interruptible(&wka_port->mutex))
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return -ERESTARTSYS;
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if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE ||
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wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) {
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wka_port->status = ZFCP_FC_WKA_PORT_OPENING;
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if (zfcp_fsf_open_wka_port(wka_port))
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wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
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}
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mutex_unlock(&wka_port->mutex);
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wait_event(wka_port->completion_wq,
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wka_port->status == ZFCP_FC_WKA_PORT_ONLINE ||
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wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);
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if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) {
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atomic_inc(&wka_port->refcount);
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return 0;
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}
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return -EIO;
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}
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static void zfcp_fc_wka_port_offline(struct work_struct *work)
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{
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struct delayed_work *dw = to_delayed_work(work);
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struct zfcp_fc_wka_port *wka_port =
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container_of(dw, struct zfcp_fc_wka_port, work);
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mutex_lock(&wka_port->mutex);
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if ((atomic_read(&wka_port->refcount) != 0) ||
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(wka_port->status != ZFCP_FC_WKA_PORT_ONLINE))
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goto out;
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wka_port->status = ZFCP_FC_WKA_PORT_CLOSING;
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if (zfcp_fsf_close_wka_port(wka_port)) {
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wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
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wake_up(&wka_port->completion_wq);
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}
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out:
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mutex_unlock(&wka_port->mutex);
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}
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static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port)
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{
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if (atomic_dec_return(&wka_port->refcount) != 0)
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return;
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/* wait 10 milliseconds, other reqs might pop in */
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schedule_delayed_work(&wka_port->work, HZ / 100);
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}
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static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id,
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struct zfcp_adapter *adapter)
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{
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init_waitqueue_head(&wka_port->completion_wq);
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wka_port->adapter = adapter;
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wka_port->d_id = d_id;
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wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
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atomic_set(&wka_port->refcount, 0);
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mutex_init(&wka_port->mutex);
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INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline);
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}
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static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka)
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{
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cancel_delayed_work_sync(&wka->work);
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mutex_lock(&wka->mutex);
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wka->status = ZFCP_FC_WKA_PORT_OFFLINE;
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mutex_unlock(&wka->mutex);
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}
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void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs)
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{
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if (!gs)
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return;
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zfcp_fc_wka_port_force_offline(&gs->ms);
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zfcp_fc_wka_port_force_offline(&gs->ts);
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zfcp_fc_wka_port_force_offline(&gs->ds);
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zfcp_fc_wka_port_force_offline(&gs->as);
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}
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static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
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struct fc_els_rscn_page *page)
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{
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unsigned long flags;
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struct zfcp_adapter *adapter = fsf_req->adapter;
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struct zfcp_port *port;
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read_lock_irqsave(&adapter->port_list_lock, flags);
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list_for_each_entry(port, &adapter->port_list, list) {
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if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range))
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zfcp_fc_test_link(port);
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}
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read_unlock_irqrestore(&adapter->port_list_lock, flags);
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}
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static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
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{
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struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
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struct zfcp_adapter *adapter = fsf_req->adapter;
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struct fc_els_rscn *head;
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struct fc_els_rscn_page *page;
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u16 i;
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u16 no_entries;
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unsigned int afmt;
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head = (struct fc_els_rscn *) status_buffer->payload.data;
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page = (struct fc_els_rscn_page *) head;
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/* see FC-FS */
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no_entries = be16_to_cpu(head->rscn_plen) /
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sizeof(struct fc_els_rscn_page);
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if (no_entries > 1) {
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/* handle failed ports */
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unsigned long flags;
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struct zfcp_port *port;
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read_lock_irqsave(&adapter->port_list_lock, flags);
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list_for_each_entry(port, &adapter->port_list, list) {
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if (port->d_id)
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continue;
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zfcp_erp_port_reopen(port,
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ZFCP_STATUS_COMMON_ERP_FAILED,
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"fcrscn1");
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}
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read_unlock_irqrestore(&adapter->port_list_lock, flags);
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}
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for (i = 1; i < no_entries; i++) {
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/* skip head and start with 1st element */
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page++;
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afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK;
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_zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt],
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page);
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zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN,
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*(u32 *)page);
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}
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zfcp_fc_conditional_port_scan(fsf_req->adapter);
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}
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static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
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{
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unsigned long flags;
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struct zfcp_adapter *adapter = req->adapter;
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struct zfcp_port *port;
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read_lock_irqsave(&adapter->port_list_lock, flags);
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list_for_each_entry(port, &adapter->port_list, list)
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if (port->wwpn == wwpn) {
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zfcp_erp_port_forced_reopen(port, 0, "fciwwp1");
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break;
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}
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read_unlock_irqrestore(&adapter->port_list_lock, flags);
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}
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static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
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{
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struct fsf_status_read_buffer *status_buffer;
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struct fc_els_flogi *plogi;
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status_buffer = (struct fsf_status_read_buffer *) req->data;
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plogi = (struct fc_els_flogi *) status_buffer->payload.data;
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zfcp_fc_incoming_wwpn(req, be64_to_cpu(plogi->fl_wwpn));
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}
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static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
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{
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struct fsf_status_read_buffer *status_buffer =
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(struct fsf_status_read_buffer *)req->data;
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struct fc_els_logo *logo =
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(struct fc_els_logo *) status_buffer->payload.data;
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zfcp_fc_incoming_wwpn(req, be64_to_cpu(logo->fl_n_port_wwn));
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}
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/**
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* zfcp_fc_incoming_els - handle incoming ELS
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* @fsf_req: request which contains incoming ELS
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*/
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void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
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{
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struct fsf_status_read_buffer *status_buffer =
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(struct fsf_status_read_buffer *) fsf_req->data;
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unsigned int els_type = status_buffer->payload.data[0];
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zfcp_dbf_san_in_els("fciels1", fsf_req);
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if (els_type == ELS_PLOGI)
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zfcp_fc_incoming_plogi(fsf_req);
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else if (els_type == ELS_LOGO)
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zfcp_fc_incoming_logo(fsf_req);
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else if (els_type == ELS_RSCN)
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zfcp_fc_incoming_rscn(fsf_req);
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}
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static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req)
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{
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struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
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struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
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if (ct_els->status)
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return;
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if (gid_pn_rsp->ct_hdr.ct_cmd != cpu_to_be16(FC_FS_ACC))
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return;
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/* looks like a valid d_id */
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ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid);
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}
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static void zfcp_fc_complete(void *data)
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{
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complete(data);
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}
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static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size)
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{
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ct_hdr->ct_rev = FC_CT_REV;
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ct_hdr->ct_fs_type = FC_FST_DIR;
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ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE;
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ct_hdr->ct_cmd = cpu_to_be16(cmd);
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ct_hdr->ct_mr_size = cpu_to_be16(mr_size / 4);
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}
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static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port,
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struct zfcp_fc_req *fc_req)
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{
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struct zfcp_adapter *adapter = port->adapter;
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DECLARE_COMPLETION_ONSTACK(completion);
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struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req;
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struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
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int ret;
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/* setup parameters for send generic command */
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fc_req->ct_els.port = port;
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fc_req->ct_els.handler = zfcp_fc_complete;
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fc_req->ct_els.handler_data = &completion;
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fc_req->ct_els.req = &fc_req->sg_req;
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fc_req->ct_els.resp = &fc_req->sg_rsp;
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sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req));
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sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp));
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zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr,
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FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE);
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gid_pn_req->gid_pn.fn_wwpn = cpu_to_be64(port->wwpn);
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ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els,
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adapter->pool.gid_pn_req,
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ZFCP_FC_CTELS_TMO);
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if (!ret) {
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wait_for_completion(&completion);
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zfcp_fc_ns_gid_pn_eval(fc_req);
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}
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return ret;
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}
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/**
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* zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request
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* @port: port where GID_PN request is needed
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* return: -ENOMEM on error, 0 otherwise
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*/
|
|
static int zfcp_fc_ns_gid_pn(struct zfcp_port *port)
|
|
{
|
|
int ret;
|
|
struct zfcp_fc_req *fc_req;
|
|
struct zfcp_adapter *adapter = port->adapter;
|
|
|
|
fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC);
|
|
if (!fc_req)
|
|
return -ENOMEM;
|
|
|
|
memset(fc_req, 0, sizeof(*fc_req));
|
|
|
|
ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = zfcp_fc_ns_gid_pn_request(port, fc_req);
|
|
|
|
zfcp_fc_wka_port_put(&adapter->gs->ds);
|
|
out:
|
|
mempool_free(fc_req, adapter->pool.gid_pn);
|
|
return ret;
|
|
}
|
|
|
|
void zfcp_fc_port_did_lookup(struct work_struct *work)
|
|
{
|
|
int ret;
|
|
struct zfcp_port *port = container_of(work, struct zfcp_port,
|
|
gid_pn_work);
|
|
|
|
set_worker_desc("zgidpn%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */
|
|
ret = zfcp_fc_ns_gid_pn(port);
|
|
if (ret) {
|
|
/* could not issue gid_pn for some reason */
|
|
zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1");
|
|
goto out;
|
|
}
|
|
|
|
if (!port->d_id) {
|
|
zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
|
|
goto out;
|
|
}
|
|
|
|
zfcp_erp_port_reopen(port, 0, "fcgpn_3");
|
|
out:
|
|
put_device(&port->dev);
|
|
}
|
|
|
|
/**
|
|
* zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request
|
|
* @port: The zfcp_port to lookup the d_id for.
|
|
*/
|
|
void zfcp_fc_trigger_did_lookup(struct zfcp_port *port)
|
|
{
|
|
get_device(&port->dev);
|
|
if (!queue_work(port->adapter->work_queue, &port->gid_pn_work))
|
|
put_device(&port->dev);
|
|
}
|
|
|
|
/**
|
|
* zfcp_fc_plogi_evaluate - evaluate PLOGI playload
|
|
* @port: zfcp_port structure
|
|
* @plogi: plogi payload
|
|
*
|
|
* Evaluate PLOGI playload and copy important fields into zfcp_port structure
|
|
*/
|
|
void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi)
|
|
{
|
|
if (be64_to_cpu(plogi->fl_wwpn) != port->wwpn) {
|
|
port->d_id = 0;
|
|
dev_warn(&port->adapter->ccw_device->dev,
|
|
"A port opened with WWPN 0x%016Lx returned data that "
|
|
"identifies it as WWPN 0x%016Lx\n",
|
|
(unsigned long long) port->wwpn,
|
|
(unsigned long long) be64_to_cpu(plogi->fl_wwpn));
|
|
return;
|
|
}
|
|
|
|
port->wwnn = be64_to_cpu(plogi->fl_wwnn);
|
|
port->maxframe_size = be16_to_cpu(plogi->fl_csp.sp_bb_data);
|
|
|
|
if (plogi->fl_cssp[0].cp_class & cpu_to_be16(FC_CPC_VALID))
|
|
port->supported_classes |= FC_COS_CLASS1;
|
|
if (plogi->fl_cssp[1].cp_class & cpu_to_be16(FC_CPC_VALID))
|
|
port->supported_classes |= FC_COS_CLASS2;
|
|
if (plogi->fl_cssp[2].cp_class & cpu_to_be16(FC_CPC_VALID))
|
|
port->supported_classes |= FC_COS_CLASS3;
|
|
if (plogi->fl_cssp[3].cp_class & cpu_to_be16(FC_CPC_VALID))
|
|
port->supported_classes |= FC_COS_CLASS4;
|
|
}
|
|
|
|
static void zfcp_fc_adisc_handler(void *data)
|
|
{
|
|
struct zfcp_fc_req *fc_req = data;
|
|
struct zfcp_port *port = fc_req->ct_els.port;
|
|
struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp;
|
|
|
|
if (fc_req->ct_els.status) {
|
|
/* request rejected or timed out */
|
|
zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
|
|
"fcadh_1");
|
|
goto out;
|
|
}
|
|
|
|
if (!port->wwnn)
|
|
port->wwnn = be64_to_cpu(adisc_resp->adisc_wwnn);
|
|
|
|
if ((port->wwpn != be64_to_cpu(adisc_resp->adisc_wwpn)) ||
|
|
!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
|
|
zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
|
|
"fcadh_2");
|
|
goto out;
|
|
}
|
|
|
|
/* port is good, unblock rport without going through erp */
|
|
zfcp_scsi_schedule_rport_register(port);
|
|
out:
|
|
atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
|
|
put_device(&port->dev);
|
|
kmem_cache_free(zfcp_fc_req_cache, fc_req);
|
|
}
|
|
|
|
static int zfcp_fc_adisc(struct zfcp_port *port)
|
|
{
|
|
struct zfcp_fc_req *fc_req;
|
|
struct zfcp_adapter *adapter = port->adapter;
|
|
struct Scsi_Host *shost = adapter->scsi_host;
|
|
int ret;
|
|
|
|
fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC);
|
|
if (!fc_req)
|
|
return -ENOMEM;
|
|
|
|
fc_req->ct_els.port = port;
|
|
fc_req->ct_els.req = &fc_req->sg_req;
|
|
fc_req->ct_els.resp = &fc_req->sg_rsp;
|
|
sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req,
|
|
sizeof(struct fc_els_adisc));
|
|
sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp,
|
|
sizeof(struct fc_els_adisc));
|
|
|
|
fc_req->ct_els.handler = zfcp_fc_adisc_handler;
|
|
fc_req->ct_els.handler_data = fc_req;
|
|
|
|
/* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
|
|
without FC-AL-2 capability, so we don't set it */
|
|
fc_req->u.adisc.req.adisc_wwpn = cpu_to_be64(fc_host_port_name(shost));
|
|
fc_req->u.adisc.req.adisc_wwnn = cpu_to_be64(fc_host_node_name(shost));
|
|
fc_req->u.adisc.req.adisc_cmd = ELS_ADISC;
|
|
hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost));
|
|
|
|
ret = zfcp_fsf_send_els(adapter, port->d_id, &fc_req->ct_els,
|
|
ZFCP_FC_CTELS_TMO);
|
|
if (ret)
|
|
kmem_cache_free(zfcp_fc_req_cache, fc_req);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void zfcp_fc_link_test_work(struct work_struct *work)
|
|
{
|
|
struct zfcp_port *port =
|
|
container_of(work, struct zfcp_port, test_link_work);
|
|
int retval;
|
|
|
|
set_worker_desc("zadisc%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */
|
|
get_device(&port->dev);
|
|
port->rport_task = RPORT_DEL;
|
|
zfcp_scsi_rport_work(&port->rport_work);
|
|
|
|
/* only issue one test command at one time per port */
|
|
if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST)
|
|
goto out;
|
|
|
|
atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
|
|
|
|
retval = zfcp_fc_adisc(port);
|
|
if (retval == 0)
|
|
return;
|
|
|
|
/* send of ADISC was not possible */
|
|
atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
|
|
zfcp_erp_port_forced_reopen(port, 0, "fcltwk1");
|
|
|
|
out:
|
|
put_device(&port->dev);
|
|
}
|
|
|
|
/**
|
|
* zfcp_fc_test_link - lightweight link test procedure
|
|
* @port: port to be tested
|
|
*
|
|
* Test status of a link to a remote port using the ELS command ADISC.
|
|
* If there is a problem with the remote port, error recovery steps
|
|
* will be triggered.
|
|
*/
|
|
void zfcp_fc_test_link(struct zfcp_port *port)
|
|
{
|
|
get_device(&port->dev);
|
|
if (!queue_work(port->adapter->work_queue, &port->test_link_work))
|
|
put_device(&port->dev);
|
|
}
|
|
|
|
/**
|
|
* zfcp_fc_sg_free_table - free memory used by scatterlists
|
|
* @sg: pointer to scatterlist
|
|
* @count: number of scatterlist which are to be free'ed
|
|
* the scatterlist are expected to reference pages always
|
|
*/
|
|
static void zfcp_fc_sg_free_table(struct scatterlist *sg, int count)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < count; i++, sg++)
|
|
if (sg)
|
|
free_page((unsigned long) sg_virt(sg));
|
|
else
|
|
break;
|
|
}
|
|
|
|
/**
|
|
* zfcp_fc_sg_setup_table - init scatterlist and allocate, assign buffers
|
|
* @sg: pointer to struct scatterlist
|
|
* @count: number of scatterlists which should be assigned with buffers
|
|
* of size page
|
|
*
|
|
* Returns: 0 on success, -ENOMEM otherwise
|
|
*/
|
|
static int zfcp_fc_sg_setup_table(struct scatterlist *sg, int count)
|
|
{
|
|
void *addr;
|
|
int i;
|
|
|
|
sg_init_table(sg, count);
|
|
for (i = 0; i < count; i++, sg++) {
|
|
addr = (void *) get_zeroed_page(GFP_KERNEL);
|
|
if (!addr) {
|
|
zfcp_fc_sg_free_table(sg, i);
|
|
return -ENOMEM;
|
|
}
|
|
sg_set_buf(sg, addr, PAGE_SIZE);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct zfcp_fc_req *zfcp_fc_alloc_sg_env(int buf_num)
|
|
{
|
|
struct zfcp_fc_req *fc_req;
|
|
|
|
fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
|
|
if (!fc_req)
|
|
return NULL;
|
|
|
|
if (zfcp_fc_sg_setup_table(&fc_req->sg_rsp, buf_num)) {
|
|
kmem_cache_free(zfcp_fc_req_cache, fc_req);
|
|
return NULL;
|
|
}
|
|
|
|
sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req,
|
|
sizeof(struct zfcp_fc_gpn_ft_req));
|
|
|
|
return fc_req;
|
|
}
|
|
|
|
static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req,
|
|
struct zfcp_adapter *adapter, int max_bytes)
|
|
{
|
|
struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
|
|
struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req;
|
|
DECLARE_COMPLETION_ONSTACK(completion);
|
|
int ret;
|
|
|
|
zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes);
|
|
req->gpn_ft.fn_fc4_type = FC_TYPE_FCP;
|
|
|
|
ct_els->handler = zfcp_fc_complete;
|
|
ct_els->handler_data = &completion;
|
|
ct_els->req = &fc_req->sg_req;
|
|
ct_els->resp = &fc_req->sg_rsp;
|
|
|
|
ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
|
|
ZFCP_FC_CTELS_TMO);
|
|
if (!ret)
|
|
wait_for_completion(&completion);
|
|
return ret;
|
|
}
|
|
|
|
static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh)
|
|
{
|
|
if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
|
|
return;
|
|
|
|
atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status);
|
|
|
|
if ((port->supported_classes != 0) ||
|
|
!list_empty(&port->unit_list))
|
|
return;
|
|
|
|
list_move_tail(&port->list, lh);
|
|
}
|
|
|
|
static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req,
|
|
struct zfcp_adapter *adapter, int max_entries)
|
|
{
|
|
struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
|
|
struct scatterlist *sg = &fc_req->sg_rsp;
|
|
struct fc_ct_hdr *hdr = sg_virt(sg);
|
|
struct fc_gpn_ft_resp *acc = sg_virt(sg);
|
|
struct zfcp_port *port, *tmp;
|
|
unsigned long flags;
|
|
LIST_HEAD(remove_lh);
|
|
u32 d_id;
|
|
int ret = 0, x, last = 0;
|
|
|
|
if (ct_els->status)
|
|
return -EIO;
|
|
|
|
if (hdr->ct_cmd != cpu_to_be16(FC_FS_ACC)) {
|
|
if (hdr->ct_reason == FC_FS_RJT_UNABL)
|
|
return -EAGAIN; /* might be a temporary condition */
|
|
return -EIO;
|
|
}
|
|
|
|
if (hdr->ct_mr_size) {
|
|
dev_warn(&adapter->ccw_device->dev,
|
|
"The name server reported %d words residual data\n",
|
|
hdr->ct_mr_size);
|
|
return -E2BIG;
|
|
}
|
|
|
|
/* first entry is the header */
|
|
for (x = 1; x < max_entries && !last; x++) {
|
|
if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
|
|
acc++;
|
|
else
|
|
acc = sg_virt(++sg);
|
|
|
|
last = acc->fp_flags & FC_NS_FID_LAST;
|
|
d_id = ntoh24(acc->fp_fid);
|
|
|
|
/* don't attach ports with a well known address */
|
|
if (d_id >= FC_FID_WELL_KNOWN_BASE)
|
|
continue;
|
|
/* skip the adapter's port and known remote ports */
|
|
if (be64_to_cpu(acc->fp_wwpn) ==
|
|
fc_host_port_name(adapter->scsi_host))
|
|
continue;
|
|
|
|
port = zfcp_port_enqueue(adapter, be64_to_cpu(acc->fp_wwpn),
|
|
ZFCP_STATUS_COMMON_NOESC, d_id);
|
|
if (!IS_ERR(port))
|
|
zfcp_erp_port_reopen(port, 0, "fcegpf1");
|
|
else if (PTR_ERR(port) != -EEXIST)
|
|
ret = PTR_ERR(port);
|
|
}
|
|
|
|
zfcp_erp_wait(adapter);
|
|
write_lock_irqsave(&adapter->port_list_lock, flags);
|
|
list_for_each_entry_safe(port, tmp, &adapter->port_list, list)
|
|
zfcp_fc_validate_port(port, &remove_lh);
|
|
write_unlock_irqrestore(&adapter->port_list_lock, flags);
|
|
|
|
list_for_each_entry_safe(port, tmp, &remove_lh, list) {
|
|
zfcp_erp_port_shutdown(port, 0, "fcegpf2");
|
|
device_unregister(&port->dev);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* zfcp_fc_scan_ports - scan remote ports and attach new ports
|
|
* @work: reference to scheduled work
|
|
*/
|
|
void zfcp_fc_scan_ports(struct work_struct *work)
|
|
{
|
|
struct delayed_work *dw = to_delayed_work(work);
|
|
struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter,
|
|
scan_work);
|
|
int ret, i;
|
|
struct zfcp_fc_req *fc_req;
|
|
int chain, max_entries, buf_num, max_bytes;
|
|
|
|
zfcp_fc_port_scan_time(adapter);
|
|
|
|
chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
|
|
buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1;
|
|
max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE;
|
|
max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE;
|
|
|
|
if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
|
|
fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
|
|
return;
|
|
|
|
if (zfcp_fc_wka_port_get(&adapter->gs->ds))
|
|
return;
|
|
|
|
fc_req = zfcp_fc_alloc_sg_env(buf_num);
|
|
if (!fc_req)
|
|
goto out;
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes);
|
|
if (!ret) {
|
|
ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries);
|
|
if (ret == -EAGAIN)
|
|
ssleep(1);
|
|
else
|
|
break;
|
|
}
|
|
}
|
|
zfcp_fc_sg_free_table(&fc_req->sg_rsp, buf_num);
|
|
kmem_cache_free(zfcp_fc_req_cache, fc_req);
|
|
out:
|
|
zfcp_fc_wka_port_put(&adapter->gs->ds);
|
|
}
|
|
|
|
static int zfcp_fc_gspn(struct zfcp_adapter *adapter,
|
|
struct zfcp_fc_req *fc_req)
|
|
{
|
|
DECLARE_COMPLETION_ONSTACK(completion);
|
|
char devno[] = "DEVNO:";
|
|
struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
|
|
struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req;
|
|
struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp;
|
|
int ret;
|
|
|
|
zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID,
|
|
FC_SYMBOLIC_NAME_SIZE);
|
|
hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host));
|
|
|
|
sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req));
|
|
sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp));
|
|
|
|
ct_els->handler = zfcp_fc_complete;
|
|
ct_els->handler_data = &completion;
|
|
ct_els->req = &fc_req->sg_req;
|
|
ct_els->resp = &fc_req->sg_rsp;
|
|
|
|
ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
|
|
ZFCP_FC_CTELS_TMO);
|
|
if (ret)
|
|
return ret;
|
|
|
|
wait_for_completion(&completion);
|
|
if (ct_els->status)
|
|
return ct_els->status;
|
|
|
|
if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV &&
|
|
!(strstr(gspn_rsp->gspn.fp_name, devno)))
|
|
snprintf(fc_host_symbolic_name(adapter->scsi_host),
|
|
FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s",
|
|
gspn_rsp->gspn.fp_name, devno,
|
|
dev_name(&adapter->ccw_device->dev),
|
|
init_utsname()->nodename);
|
|
else
|
|
strlcpy(fc_host_symbolic_name(adapter->scsi_host),
|
|
gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void zfcp_fc_rspn(struct zfcp_adapter *adapter,
|
|
struct zfcp_fc_req *fc_req)
|
|
{
|
|
DECLARE_COMPLETION_ONSTACK(completion);
|
|
struct Scsi_Host *shost = adapter->scsi_host;
|
|
struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
|
|
struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req;
|
|
struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp;
|
|
int ret, len;
|
|
|
|
zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID,
|
|
FC_SYMBOLIC_NAME_SIZE);
|
|
hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost));
|
|
len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost),
|
|
FC_SYMBOLIC_NAME_SIZE);
|
|
rspn_req->rspn.fr_name_len = len;
|
|
|
|
sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req));
|
|
sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp));
|
|
|
|
ct_els->handler = zfcp_fc_complete;
|
|
ct_els->handler_data = &completion;
|
|
ct_els->req = &fc_req->sg_req;
|
|
ct_els->resp = &fc_req->sg_rsp;
|
|
|
|
ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
|
|
ZFCP_FC_CTELS_TMO);
|
|
if (!ret)
|
|
wait_for_completion(&completion);
|
|
}
|
|
|
|
/**
|
|
* zfcp_fc_sym_name_update - Retrieve and update the symbolic port name
|
|
* @work: ns_up_work of the adapter where to update the symbolic port name
|
|
*
|
|
* Retrieve the current symbolic port name that may have been set by
|
|
* the hardware using the GSPN request and update the fc_host
|
|
* symbolic_name sysfs attribute. When running in NPIV mode (and hence
|
|
* the port name is unique for this system), update the symbolic port
|
|
* name to add Linux specific information and update the FC nameserver
|
|
* using the RSPN request.
|
|
*/
|
|
void zfcp_fc_sym_name_update(struct work_struct *work)
|
|
{
|
|
struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
|
|
ns_up_work);
|
|
int ret;
|
|
struct zfcp_fc_req *fc_req;
|
|
|
|
if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
|
|
fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
|
|
return;
|
|
|
|
fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
|
|
if (!fc_req)
|
|
return;
|
|
|
|
ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
|
|
if (ret)
|
|
goto out_free;
|
|
|
|
ret = zfcp_fc_gspn(adapter, fc_req);
|
|
if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
|
|
goto out_ds_put;
|
|
|
|
memset(fc_req, 0, sizeof(*fc_req));
|
|
zfcp_fc_rspn(adapter, fc_req);
|
|
|
|
out_ds_put:
|
|
zfcp_fc_wka_port_put(&adapter->gs->ds);
|
|
out_free:
|
|
kmem_cache_free(zfcp_fc_req_cache, fc_req);
|
|
}
|
|
|
|
static void zfcp_fc_ct_els_job_handler(void *data)
|
|
{
|
|
struct bsg_job *job = data;
|
|
struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data;
|
|
struct fc_bsg_reply *jr = job->reply;
|
|
|
|
jr->reply_payload_rcv_len = job->reply_payload.payload_len;
|
|
jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK;
|
|
jr->result = zfcp_ct_els->status ? -EIO : 0;
|
|
bsg_job_done(job, jr->result, jr->reply_payload_rcv_len);
|
|
}
|
|
|
|
static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct bsg_job *job)
|
|
{
|
|
u32 preamble_word1;
|
|
u8 gs_type;
|
|
struct zfcp_adapter *adapter;
|
|
struct fc_bsg_request *bsg_request = job->request;
|
|
struct fc_rport *rport = fc_bsg_to_rport(job);
|
|
struct Scsi_Host *shost;
|
|
|
|
preamble_word1 = bsg_request->rqst_data.r_ct.preamble_word1;
|
|
gs_type = (preamble_word1 & 0xff000000) >> 24;
|
|
|
|
shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);
|
|
adapter = (struct zfcp_adapter *) shost->hostdata[0];
|
|
|
|
switch (gs_type) {
|
|
case FC_FST_ALIAS:
|
|
return &adapter->gs->as;
|
|
case FC_FST_MGMT:
|
|
return &adapter->gs->ms;
|
|
case FC_FST_TIME:
|
|
return &adapter->gs->ts;
|
|
break;
|
|
case FC_FST_DIR:
|
|
return &adapter->gs->ds;
|
|
break;
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static void zfcp_fc_ct_job_handler(void *data)
|
|
{
|
|
struct bsg_job *job = data;
|
|
struct zfcp_fc_wka_port *wka_port;
|
|
|
|
wka_port = zfcp_fc_job_wka_port(job);
|
|
zfcp_fc_wka_port_put(wka_port);
|
|
|
|
zfcp_fc_ct_els_job_handler(data);
|
|
}
|
|
|
|
static int zfcp_fc_exec_els_job(struct bsg_job *job,
|
|
struct zfcp_adapter *adapter)
|
|
{
|
|
struct zfcp_fsf_ct_els *els = job->dd_data;
|
|
struct fc_rport *rport = fc_bsg_to_rport(job);
|
|
struct fc_bsg_request *bsg_request = job->request;
|
|
struct zfcp_port *port;
|
|
u32 d_id;
|
|
|
|
if (rport) {
|
|
port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
|
|
if (!port)
|
|
return -EINVAL;
|
|
|
|
d_id = port->d_id;
|
|
put_device(&port->dev);
|
|
} else
|
|
d_id = ntoh24(bsg_request->rqst_data.h_els.port_id);
|
|
|
|
els->handler = zfcp_fc_ct_els_job_handler;
|
|
return zfcp_fsf_send_els(adapter, d_id, els, job->timeout / HZ);
|
|
}
|
|
|
|
static int zfcp_fc_exec_ct_job(struct bsg_job *job,
|
|
struct zfcp_adapter *adapter)
|
|
{
|
|
int ret;
|
|
struct zfcp_fsf_ct_els *ct = job->dd_data;
|
|
struct zfcp_fc_wka_port *wka_port;
|
|
|
|
wka_port = zfcp_fc_job_wka_port(job);
|
|
if (!wka_port)
|
|
return -EINVAL;
|
|
|
|
ret = zfcp_fc_wka_port_get(wka_port);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ct->handler = zfcp_fc_ct_job_handler;
|
|
ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->timeout / HZ);
|
|
if (ret)
|
|
zfcp_fc_wka_port_put(wka_port);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int zfcp_fc_exec_bsg_job(struct bsg_job *job)
|
|
{
|
|
struct Scsi_Host *shost;
|
|
struct zfcp_adapter *adapter;
|
|
struct zfcp_fsf_ct_els *ct_els = job->dd_data;
|
|
struct fc_bsg_request *bsg_request = job->request;
|
|
struct fc_rport *rport = fc_bsg_to_rport(job);
|
|
|
|
shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);
|
|
adapter = (struct zfcp_adapter *)shost->hostdata[0];
|
|
|
|
if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
|
|
return -EINVAL;
|
|
|
|
ct_els->req = job->request_payload.sg_list;
|
|
ct_els->resp = job->reply_payload.sg_list;
|
|
ct_els->handler_data = job;
|
|
|
|
switch (bsg_request->msgcode) {
|
|
case FC_BSG_RPT_ELS:
|
|
case FC_BSG_HST_ELS_NOLOGIN:
|
|
return zfcp_fc_exec_els_job(job, adapter);
|
|
case FC_BSG_RPT_CT:
|
|
case FC_BSG_HST_CT:
|
|
return zfcp_fc_exec_ct_job(job, adapter);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
int zfcp_fc_timeout_bsg_job(struct bsg_job *job)
|
|
{
|
|
/* hardware tracks timeout, reset bsg timeout to not interfere */
|
|
return -EAGAIN;
|
|
}
|
|
|
|
int zfcp_fc_gs_setup(struct zfcp_adapter *adapter)
|
|
{
|
|
struct zfcp_fc_wka_ports *wka_ports;
|
|
|
|
wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL);
|
|
if (!wka_ports)
|
|
return -ENOMEM;
|
|
|
|
adapter->gs = wka_ports;
|
|
zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter);
|
|
zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter);
|
|
zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter);
|
|
zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter)
|
|
{
|
|
kfree(adapter->gs);
|
|
adapter->gs = NULL;
|
|
}
|
|
|