// SPDX-License-Identifier: GPL-2.0
/*
* zfcp device driver
*
* Fibre Channel related functions for the zfcp device driver.
*
* Copyright IBM Corp. 2008, 2017
*/
#define KMSG_COMPONENT "zfcp"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/utsname.h>
#include <linux/random.h>
#include <linux/bsg-lib.h>
#include <scsi/fc/fc_els.h>
#include <scsi/libfc.h>
#include "zfcp_ext.h"
#include "zfcp_fc.h"
struct kmem_cache *zfcp_fc_req_cache;
static u32 zfcp_fc_rscn_range_mask[] = {
[ELS_ADDR_FMT_PORT] = 0xFFFFFF,
[ELS_ADDR_FMT_AREA] = 0xFFFF00,
[ELS_ADDR_FMT_DOM] = 0xFF0000,
[ELS_ADDR_FMT_FAB] = 0x000000,
};
static bool no_auto_port_rescan;
module_param(no_auto_port_rescan, bool, 0600);
MODULE_PARM_DESC(no_auto_port_rescan,
"no automatic port_rescan (default off)");
static unsigned int port_scan_backoff = 500;
module_param(port_scan_backoff, uint, 0600);
MODULE_PARM_DESC(port_scan_backoff,
"upper limit of port scan random backoff in msecs (default 500)");
static unsigned int port_scan_ratelimit = 60000;
module_param(port_scan_ratelimit, uint, 0600);
MODULE_PARM_DESC(port_scan_ratelimit,
"minimum interval between port scans in msecs (default 60000)");
unsigned int zfcp_fc_port_scan_backoff(void)
{
if (!port_scan_backoff)
return 0;
return get_random_u32_below(port_scan_backoff);
}
static void zfcp_fc_port_scan_time(struct zfcp_adapter *adapter)
{
unsigned long interval = msecs_to_jiffies(port_scan_ratelimit);
unsigned long backoff = msecs_to_jiffies(zfcp_fc_port_scan_backoff());
adapter->next_port_scan = jiffies + interval + backoff;
}
static void zfcp_fc_port_scan(struct zfcp_adapter *adapter)
{
unsigned long now = jiffies;
unsigned long next = adapter->next_port_scan;
unsigned long delay = 0, max;
/* delay only needed within waiting period */
if (time_before(now, next)) {
delay = next - now;
/* paranoia: never ever delay scans longer than specified */
max = msecs_to_jiffies(port_scan_ratelimit + port_scan_backoff);
delay = min(delay, max);
}
queue_delayed_work(adapter->work_queue, &adapter->scan_work, delay);
}
void zfcp_fc_conditional_port_scan(struct zfcp_adapter *adapter)
{
if (no_auto_port_rescan)
return;
zfcp_fc_port_scan(adapter);
}
void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *adapter)
{
if (!no_auto_port_rescan)
return;
zfcp_fc_port_scan(adapter);
}
/**
* zfcp_fc_post_event - post event to userspace via fc_transport
* @work: work struct with enqueued events
*/
void zfcp_fc_post_event(struct work_struct *work)
{
struct zfcp_fc_event *event = NULL, *tmp = NULL;
LIST_HEAD(tmp_lh);
struct zfcp_fc_events *events = container_of(work,
struct zfcp_fc_events, work);
struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter,
events);
spin_lock_bh(&events->list_lock);
list_splice_init(&events->list, &tmp_lh);
spin_unlock_bh(&events->list_lock);
list_for_each_entry_safe(event, tmp, &tmp_lh, list) {
fc_host_post_event(adapter->scsi_host, fc_get_event_number(),
event->code, event->data);
list_del(&event->list);
kfree(event);
}
}
/**
* zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context
* @adapter: The adapter where to enqueue the event
* @event_code: The event code (as defined in fc_host_event_code in
* scsi_transport_fc.h)
* @event_data: The event data (e.g. n_port page in case of els)
*/
void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter,
enum fc_host_event_code event_code, u32 event_data)
{
struct zfcp_fc_event *event;
event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC);
if (!event)
return;
event->code = event_code;
event->data = event_data;
spin_lock(&adapter->events.list_lock);
list_add_tail(&event->list, &adapter->events.list);
spin_unlock(&adapter->events.list_lock);
queue_work(adapter->work_queue, &adapter->events.work);
}
static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port)
{
int ret = -EIO;
if (mutex_lock_interruptible(&wka_port->mutex))
return -ERESTARTSYS;
if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE ||
wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) {
wka_port->status = ZFCP_FC_WKA_PORT_OPENING;
if (zfcp_fsf_open_wka_port(wka_port)) {
/* could not even send request, nothing to wait for */
wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
goto out;
}
}
wait_event(wka_port->opened,
wka_port->status == ZFCP_FC_WKA_PORT_ONLINE ||
wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);
if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) {
atomic_inc(&wka_port->refcount);
ret = 0;
goto out;
}
out:
mutex_unlock(&wka_port->mutex);
return ret;
}
static void zfcp_fc_wka_port_offline(struct work_struct *work)
{
struct delayed_work *dw = to_delayed_work(work);
struct zfcp_fc_wka_port *wka_port =
container_of(dw, struct zfcp_fc_wka_port, work);
mutex_lock(&wka_port->mutex);
if ((atomic_read(&wka_port->refcount) != 0) ||
(wka_port->status != ZFCP_FC_WKA_PORT_ONLINE))
goto out;
wka_port->status = ZFCP_FC_WKA_PORT_CLOSING;
if (zfcp_fsf_close_wka_port(wka_port)) {
/* could not even send request, nothing to wait for */
wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
goto out;
}
wait_event(wka_port->closed,
wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);
out:
mutex_unlock(&wka_port->mutex);
}
static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port)
{
if (atomic_dec_return(&wka_port->refcount) != 0)
return;
/* wait 10 milliseconds, other reqs might pop in */
queue_delayed_work(wka_port->adapter->work_queue, &wka_port->work,
msecs_to_jiffies(10));
}
static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id,
struct zfcp_adapter *adapter)
{
init_waitqueue_head(&wka_port->opened);
init_waitqueue_head(&wka_port->closed);
wka_port->adapter = adapter;
wka_port->d_id = d_id;
wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
atomic_set(&wka_port->refcount, 0);
mutex_init(&wka_port->mutex);
INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline);
}
static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka)
{
cancel_delayed_work_sync(&wka->work);
mutex_lock(&wka->mutex);
wka->status = ZFCP_FC_WKA_PORT_OFFLINE;
mutex_unlock(&wka->mutex);
}
void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs)
{
if (!gs)
return;
zfcp_fc_wka_port_force_offline(&gs->ms);
zfcp_fc_wka_port_force_offline(&gs->ts);
zfcp_fc_wka_port_force_offline(&gs->ds);
zfcp_fc_wka_port_force_offline(&gs->as);
}
static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
struct fc_els_rscn_page *page)
{
unsigned long flags;
struct zfcp_adapter *adapter = fsf_req->adapter;
struct zfcp_port *port;
read_lock_irqsave(&adapter->port_list_lock, flags);
list_for_each_entry(port, &adapter->port_list, list) {
if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range))
zfcp_fc_test_link(port);
}
read_unlock_irqrestore(&adapter->port_list_lock, flags);
}
static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
{
struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
struct zfcp_adapter *adapter = fsf_req->adapter;
struct fc_els_rscn *head;
struct fc_els_rscn_page *page;
u16 i;
u16 no_entries;
unsigned int afmt;
head = (struct fc_els_rscn *) status_buffer->payload.data;
page = (struct fc_els_rscn_page *) head;
/* see FC-FS */
no_entries = be16_to_cpu(head->rscn_plen) /
sizeof(struct fc_els_rscn_page);
if (no_entries > 1) {
/* handle failed ports */
unsigned long flags;
struct zfcp_port *port;
read_lock_irqsave(&adapter->port_list_lock, flags);
list_for_each_entry(port, &adapter->port_list, list) {
if (port->d_id)
continue;
zfcp_erp_port_reopen(port,
ZFCP_STATUS_COMMON_ERP_FAILED,
"fcrscn1");
}
read_unlock_irqrestore(&adapter->port_list_lock, flags);
}
for (i = 1; i < no_entries; i++) {
/* skip head and start with 1st element */
page++;
afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK;
_zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt],
page);
zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN,
*(u32 *)page);
}
zfcp_fc_conditional_port_scan(fsf_req->adapter);
}
static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
{
unsigned long flags;
struct zfcp_adapter *adapter = req->adapter;
struct zfcp_port *port;
read_lock_irqsave(&adapter->port_list_lock, flags);
list_for_each_entry(port, &adapter->port_list, list)
if (port->wwpn == wwpn) {
zfcp_erp_port_forced_reopen(port, 0, "fciwwp1");
break;
}
read_unlock_irqrestore(&adapter->port_list_lock, flags);
}
static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
{
struct fsf_status_read_buffer *status_buffer;
struct fc_els_flogi *plogi;
status_buffer = (struct fsf_status_read_buffer *) req->data;
plogi = (struct fc_els_flogi *) status_buffer->payload.data;
zfcp_fc_incoming_wwpn(req, be64_to_cpu(plogi->fl_wwpn));
}
static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
{
struct fsf_status_read_buffer *status_buffer =
(struct fsf_status_read_buffer *)req->data;
struct fc_els_logo *logo =
(struct fc_els_logo *) status_buffer->payload.data;
zfcp_fc_incoming_wwpn(req, be64_to_cpu(logo->fl_n_port_wwn));
}
/**
* zfcp_fc_incoming_els - handle incoming ELS
* @fsf_req: request which contains incoming ELS
*/
void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
{
struct fsf_status_read_buffer *status_buffer =
(struct fsf_status_read_buffer *) fsf_req->data;
unsigned int els_type = status_buffer->payload.data[0];
zfcp_dbf_san_in_els("fciels1", fsf_req);
if (els_type == ELS_PLOGI)
zfcp_fc_incoming_plogi(fsf_req);
else if (els_type == ELS_LOGO)
zfcp_fc_incoming_logo(fsf_req);
else if (els_type == ELS_RSCN)
zfcp_fc_incoming_rscn(fsf_req);
}
static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req)
{
struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
if (ct_els->status)
return;
if (gid_pn_rsp->ct_hdr.ct_cmd != cpu_to_be16(FC_FS_ACC))
return;
/* looks like a valid d_id */
ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid);
}
static void zfcp_fc_complete(void *data)
{
complete(data);
}
static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size)
{
ct_hdr->ct_rev = FC_CT_REV;
ct_hdr->ct_fs_type = FC_FST_DIR;
ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE;
ct_hdr->ct_cmd = cpu_to_be16(cmd);
ct_hdr->ct_mr_size = cpu_to_be16(mr_size / 4);
}
static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port,
struct zfcp_fc_req *fc_req)
{
struct zfcp_adapter *adapter = port->adapter;
DECLARE_COMPLETION_ONSTACK(completion);
struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req;
struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
int ret;
/* setup parameters for send generic command */
fc_req->ct_els.port = port;
fc_req->ct_els.handler = zfcp_fc_complete;
fc_req->ct_els.handler_data = &completion;
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, gid_pn_req, sizeof(*gid_pn_req));
sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp));
zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr,
FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE);
gid_pn_req->gid_pn.fn_wwpn = cpu_to_be64(port->wwpn);
ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els,
adapter->pool.gid_pn_req,
ZFCP_FC_CTELS_TMO);
if (!ret) {
wait_for_completion(&completion);
zfcp_fc_ns_gid_pn_eval(fc_req);
}
return ret;
}
/**
* zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request
* @port: port where GID_PN request is needed
* return: -ENOMEM on error, 0 otherwise
*/
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;
}
/* re-init to undo drop from zfcp_fc_adisc() */
port->d_id = ntoh24(adisc_resp->adisc_port_id);
/* port is still good, nothing to do */
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;
u32 d_id;
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));
d_id = port->d_id; /* remember as destination for send els below */
/*
* Force fresh GID_PN lookup on next port recovery.
* Must happen after request setup and before sending request,
* to prevent race with port->d_id re-init in zfcp_fc_adisc_handler().
*/
port->d_id = 0;
ret = zfcp_fsf_send_els(adapter, 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 */
/* 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 = sg_next(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 = sg_next(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
strscpy(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));
BUILD_BUG_ON(sizeof(rspn_req->name) !=
sizeof(fc_host_symbolic_name(shost)));
BUILD_BUG_ON(sizeof(rspn_req->name) !=
type_max(typeof(rspn_req->rspn.fr_name_len)) + 1);
len = strscpy(rspn_req->name, fc_host_symbolic_name(shost),
sizeof(rspn_req->name));
/*
* It should be impossible for this to truncate (see BUILD_BUG_ON()
* above), but be robust anyway.
*/
if (WARN_ON(len < 0))
len = sizeof(rspn_req->name) - 1;
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;
}
Codebase Browser
linux