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gfiber / kernel / prism / ee1c381d6f3c5aca1340c833b14a562a80da7a0e / . / drivers / scsi / libfc / fc_lport.c
blob: 536492ae6a88812b44c0ea57abe6076473b22f02 [file] [log] [blame]
/*
* Copyright(c) 2007 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
* Maintained at www.Open-FCoE.org
*/
/*
* PORT LOCKING NOTES
*
* These comments only apply to the 'port code' which consists of the lport,
* disc and rport blocks.
*
* MOTIVATION
*
* The lport, disc and rport blocks all have mutexes that are used to protect
* those objects. The main motivation for these locks is to prevent from
* having an lport reset just before we send a frame. In that scenario the
* lport's FID would get set to zero and then we'd send a frame with an
* invalid SID. We also need to ensure that states don't change unexpectedly
* while processing another state.
*
* HEIRARCHY
*
* The following heirarchy defines the locking rules. A greater lock
* may be held before acquiring a lesser lock, but a lesser lock should never
* be held while attempting to acquire a greater lock. Here is the heirarchy-
*
* lport > disc, lport > rport, disc > rport
*
* CALLBACKS
*
* The callbacks cause complications with this scheme. There is a callback
* from the rport (to either lport or disc) and a callback from disc
* (to the lport).
*
* As rports exit the rport state machine a callback is made to the owner of
* the rport to notify success or failure. Since the callback is likely to
* cause the lport or disc to grab its lock we cannot hold the rport lock
* while making the callback. To ensure that the rport is not free'd while
* processing the callback the rport callbacks are serialized through a
* single-threaded workqueue. An rport would never be free'd while in a
* callback handler becuase no other rport work in this queue can be executed
* at the same time.
*
* When discovery succeeds or fails a callback is made to the lport as
* notification. Currently, succesful discovery causes the lport to take no
* action. A failure will cause the lport to reset. There is likely a circular
* locking problem with this implementation.
*/
/*
* LPORT LOCKING
*
* The critical sections protected by the lport's mutex are quite broad and
* may be improved upon in the future. The lport code and its locking doesn't
* influence the I/O path, so excessive locking doesn't penalize I/O
* performance.
*
* The strategy is to lock whenever processing a request or response. Note
* that every _enter_* function corresponds to a state change. They generally
* change the lports state and then send a request out on the wire. We lock
* before calling any of these functions to protect that state change. This
* means that the entry points into the lport block manage the locks while
* the state machine can transition between states (i.e. _enter_* functions)
* while always staying protected.
*
* When handling responses we also hold the lport mutex broadly. When the
* lport receives the response frame it locks the mutex and then calls the
* appropriate handler for the particuar response. Generally a response will
* trigger a state change and so the lock must already be held.
*
* Retries also have to consider the locking. The retries occur from a work
* context and the work function will lock the lport and then retry the state
* (i.e. _enter_* function).
*/
#include <linux/timer.h>
#include <asm/unaligned.h>
#include <scsi/fc/fc_gs.h>
#include <scsi/libfc.h>
#include <scsi/fc_encode.h>
/* Fabric IDs to use for point-to-point mode, chosen on whims. */
#define FC_LOCAL_PTP_FID_LO 0x010101
#define FC_LOCAL_PTP_FID_HI 0x010102
#define DNS_DELAY 3 /* Discovery delay after RSCN (in seconds)*/
static void fc_lport_error(struct fc_lport *, struct fc_frame *);
static void fc_lport_enter_reset(struct fc_lport *);
static void fc_lport_enter_flogi(struct fc_lport *);
static void fc_lport_enter_dns(struct fc_lport *);
static void fc_lport_enter_rpn_id(struct fc_lport *);
static void fc_lport_enter_rft_id(struct fc_lport *);
static void fc_lport_enter_scr(struct fc_lport *);
static void fc_lport_enter_ready(struct fc_lport *);
static void fc_lport_enter_logo(struct fc_lport *);
static const char *fc_lport_state_names[] = {
[LPORT_ST_DISABLED] = "disabled",
[LPORT_ST_FLOGI] = "FLOGI",
[LPORT_ST_DNS] = "dNS",
[LPORT_ST_RPN_ID] = "RPN_ID",
[LPORT_ST_RFT_ID] = "RFT_ID",
[LPORT_ST_SCR] = "SCR",
[LPORT_ST_READY] = "Ready",
[LPORT_ST_LOGO] = "LOGO",
[LPORT_ST_RESET] = "reset",
};
static int fc_frame_drop(struct fc_lport *lport, struct fc_frame *fp)
{
fc_frame_free(fp);
return 0;
}
/**
* fc_lport_rport_callback() - Event handler for rport events
* @lport: The lport which is receiving the event
* @rdata: private remote port data
* @event: The event that occured
*
* Locking Note: The rport lock should not be held when calling
* this function.
*/
static void fc_lport_rport_callback(struct fc_lport *lport,
struct fc_rport_priv *rdata,
enum fc_rport_event event)
{
FC_LPORT_DBG(lport, "Received a %d event for port (%6x)\n", event,
rdata->ids.port_id);
mutex_lock(&lport->lp_mutex);
switch (event) {
case RPORT_EV_READY:
if (lport->state == LPORT_ST_DNS) {
lport->dns_rp = rdata;
fc_lport_enter_rpn_id(lport);
} else {
FC_LPORT_DBG(lport, "Received an READY event "
"on port (%6x) for the directory "
"server, but the lport is not "
"in the DNS state, it's in the "
"%d state", rdata->ids.port_id,
lport->state);
lport->tt.rport_logoff(rdata);
}
break;
case RPORT_EV_LOGO:
case RPORT_EV_FAILED:
case RPORT_EV_STOP:
lport->dns_rp = NULL;
break;
case RPORT_EV_NONE:
break;
}
mutex_unlock(&lport->lp_mutex);
}
/**
* fc_lport_state() - Return a string which represents the lport's state
* @lport: The lport whose state is to converted to a string
*/
static const char *fc_lport_state(struct fc_lport *lport)
{
const char *cp;
cp = fc_lport_state_names[lport->state];
if (!cp)
cp = "unknown";
return cp;
}
/**
* fc_lport_ptp_setup() - Create an rport for point-to-point mode
* @lport: The lport to attach the ptp rport to
* @fid: The FID of the ptp rport
* @remote_wwpn: The WWPN of the ptp rport
* @remote_wwnn: The WWNN of the ptp rport
*/
static void fc_lport_ptp_setup(struct fc_lport *lport,
u32 remote_fid, u64 remote_wwpn,
u64 remote_wwnn)
{
mutex_lock(&lport->disc.disc_mutex);
if (lport->ptp_rp)
lport->tt.rport_logoff(lport->ptp_rp);
lport->ptp_rp = lport->tt.rport_create(lport, remote_fid);
lport->ptp_rp->ids.port_name = remote_wwpn;
lport->ptp_rp->ids.node_name = remote_wwnn;
mutex_unlock(&lport->disc.disc_mutex);
lport->tt.rport_login(lport->ptp_rp);
fc_lport_enter_ready(lport);
}
void fc_get_host_port_type(struct Scsi_Host *shost)
{
/* TODO - currently just NPORT */
fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
}
EXPORT_SYMBOL(fc_get_host_port_type);
void fc_get_host_port_state(struct Scsi_Host *shost)
{
struct fc_lport *lp = shost_priv(shost);
if (lp->link_up)
fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
else
fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
}
EXPORT_SYMBOL(fc_get_host_port_state);
void fc_get_host_speed(struct Scsi_Host *shost)
{
struct fc_lport *lport = shost_priv(shost);
fc_host_speed(shost) = lport->link_speed;
}
EXPORT_SYMBOL(fc_get_host_speed);
struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost)
{
struct fc_host_statistics *fcoe_stats;
struct fc_lport *lp = shost_priv(shost);
struct timespec v0, v1;
unsigned int cpu;
fcoe_stats = &lp->host_stats;
memset(fcoe_stats, 0, sizeof(struct fc_host_statistics));
jiffies_to_timespec(jiffies, &v0);
jiffies_to_timespec(lp->boot_time, &v1);
fcoe_stats->seconds_since_last_reset = (v0.tv_sec - v1.tv_sec);
for_each_possible_cpu(cpu) {
struct fcoe_dev_stats *stats;
stats = per_cpu_ptr(lp->dev_stats, cpu);
fcoe_stats->tx_frames += stats->TxFrames;
fcoe_stats->tx_words += stats->TxWords;
fcoe_stats->rx_frames += stats->RxFrames;
fcoe_stats->rx_words += stats->RxWords;
fcoe_stats->error_frames += stats->ErrorFrames;
fcoe_stats->invalid_crc_count += stats->InvalidCRCCount;
fcoe_stats->fcp_input_requests += stats->InputRequests;
fcoe_stats->fcp_output_requests += stats->OutputRequests;
fcoe_stats->fcp_control_requests += stats->ControlRequests;
fcoe_stats->fcp_input_megabytes += stats->InputMegabytes;
fcoe_stats->fcp_output_megabytes += stats->OutputMegabytes;
fcoe_stats->link_failure_count += stats->LinkFailureCount;
}
fcoe_stats->lip_count = -1;
fcoe_stats->nos_count = -1;
fcoe_stats->loss_of_sync_count = -1;
fcoe_stats->loss_of_signal_count = -1;
fcoe_stats->prim_seq_protocol_err_count = -1;
fcoe_stats->dumped_frames = -1;
return fcoe_stats;
}
EXPORT_SYMBOL(fc_get_host_stats);
/*
* Fill in FLOGI command for request.
*/
static void
fc_lport_flogi_fill(struct fc_lport *lport, struct fc_els_flogi *flogi,
unsigned int op)
{
struct fc_els_csp *sp;
struct fc_els_cssp *cp;
memset(flogi, 0, sizeof(*flogi));
flogi->fl_cmd = (u8) op;
put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn);
put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn);
sp = &flogi->fl_csp;
sp->sp_hi_ver = 0x20;
sp->sp_lo_ver = 0x20;
sp->sp_bb_cred = htons(10); /* this gets set by gateway */
sp->sp_bb_data = htons((u16) lport->mfs);
cp = &flogi->fl_cssp[3 - 1]; /* class 3 parameters */
cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
if (op != ELS_FLOGI) {
sp->sp_features = htons(FC_SP_FT_CIRO);
sp->sp_tot_seq = htons(255); /* seq. we accept */
sp->sp_rel_off = htons(0x1f);
sp->sp_e_d_tov = htonl(lport->e_d_tov);
cp->cp_rdfs = htons((u16) lport->mfs);
cp->cp_con_seq = htons(255);
cp->cp_open_seq = 1;
}
}
/*
* Add a supported FC-4 type.
*/
static void fc_lport_add_fc4_type(struct fc_lport *lport, enum fc_fh_type type)
{
__be32 *mp;
mp = &lport->fcts.ff_type_map[type / FC_NS_BPW];
*mp = htonl(ntohl(*mp) | 1UL << (type % FC_NS_BPW));
}
/**
* fc_lport_recv_rlir_req() - Handle received Registered Link Incident Report.
* @lport: Fibre Channel local port recieving the RLIR
* @sp: current sequence in the RLIR exchange
* @fp: RLIR request frame
*
* Locking Note: The lport lock is expected to be held before calling
* this function.
*/
static void fc_lport_recv_rlir_req(struct fc_seq *sp, struct fc_frame *fp,
struct fc_lport *lport)
{
FC_LPORT_DBG(lport, "Received RLIR request while in state %s\n",
fc_lport_state(lport));
lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
fc_frame_free(fp);
}
/**
* fc_lport_recv_echo_req() - Handle received ECHO request
* @lport: Fibre Channel local port recieving the ECHO
* @sp: current sequence in the ECHO exchange
* @fp: ECHO request frame
*
* Locking Note: The lport lock is expected to be held before calling
* this function.
*/
static void fc_lport_recv_echo_req(struct fc_seq *sp, struct fc_frame *in_fp,
struct fc_lport *lport)
{
struct fc_frame *fp;
struct fc_exch *ep = fc_seq_exch(sp);
unsigned int len;
void *pp;
void *dp;
u32 f_ctl;
FC_LPORT_DBG(lport, "Received ECHO request while in state %s\n",
fc_lport_state(lport));
len = fr_len(in_fp) - sizeof(struct fc_frame_header);
pp = fc_frame_payload_get(in_fp, len);
if (len < sizeof(__be32))
len = sizeof(__be32);
fp = fc_frame_alloc(lport, len);
if (fp) {
dp = fc_frame_payload_get(fp, len);
memcpy(dp, pp, len);
*((__be32 *)dp) = htonl(ELS_LS_ACC << 24);
sp = lport->tt.seq_start_next(sp);
f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ;
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
FC_TYPE_ELS, f_ctl, 0);
lport->tt.seq_send(lport, sp, fp);
}
fc_frame_free(in_fp);
}
/**
* fc_lport_recv_rnid_req() - Handle received Request Node ID data request
* @sp: The sequence in the RNID exchange
* @fp: The RNID request frame
* @lport: The local port recieving the RNID
*
* Locking Note: The lport lock is expected to be held before calling
* this function.
*/
static void fc_lport_recv_rnid_req(struct fc_seq *sp, struct fc_frame *in_fp,
struct fc_lport *lport)
{
struct fc_frame *fp;
struct fc_exch *ep = fc_seq_exch(sp);
struct fc_els_rnid *req;
struct {
struct fc_els_rnid_resp rnid;
struct fc_els_rnid_cid cid;
struct fc_els_rnid_gen gen;
} *rp;
struct fc_seq_els_data rjt_data;
u8 fmt;
size_t len;
u32 f_ctl;
FC_LPORT_DBG(lport, "Received RNID request while in state %s\n",
fc_lport_state(lport));
req = fc_frame_payload_get(in_fp, sizeof(*req));
if (!req) {
rjt_data.fp = NULL;
rjt_data.reason = ELS_RJT_LOGIC;
rjt_data.explan = ELS_EXPL_NONE;
lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
} else {
fmt = req->rnid_fmt;
len = sizeof(*rp);
if (fmt != ELS_RNIDF_GEN ||
ntohl(lport->rnid_gen.rnid_atype) == 0) {
fmt = ELS_RNIDF_NONE; /* nothing to provide */
len -= sizeof(rp->gen);
}
fp = fc_frame_alloc(lport, len);
if (fp) {
rp = fc_frame_payload_get(fp, len);
memset(rp, 0, len);
rp->rnid.rnid_cmd = ELS_LS_ACC;
rp->rnid.rnid_fmt = fmt;
rp->rnid.rnid_cid_len = sizeof(rp->cid);
rp->cid.rnid_wwpn = htonll(lport->wwpn);
rp->cid.rnid_wwnn = htonll(lport->wwnn);
if (fmt == ELS_RNIDF_GEN) {
rp->rnid.rnid_sid_len = sizeof(rp->gen);
memcpy(&rp->gen, &lport->rnid_gen,
sizeof(rp->gen));
}
sp = lport->tt.seq_start_next(sp);
f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
FC_TYPE_ELS, f_ctl, 0);
lport->tt.seq_send(lport, sp, fp);
}
}
fc_frame_free(in_fp);
}
/**
* fc_lport_recv_logo_req() - Handle received fabric LOGO request
* @lport: Fibre Channel local port recieving the LOGO
* @sp: current sequence in the LOGO exchange
* @fp: LOGO request frame
*
* Locking Note: The lport lock is exected to be held before calling
* this function.
*/
static void fc_lport_recv_logo_req(struct fc_seq *sp, struct fc_frame *fp,
struct fc_lport *lport)
{
lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
fc_lport_enter_reset(lport);
fc_frame_free(fp);
}
/**
* fc_fabric_login() - Start the lport state machine
* @lport: The lport that should log into the fabric
*
* Locking Note: This function should not be called
* with the lport lock held.
*/
int fc_fabric_login(struct fc_lport *lport)
{
int rc = -1;
mutex_lock(&lport->lp_mutex);
if (lport->state == LPORT_ST_DISABLED) {
fc_lport_enter_reset(lport);
rc = 0;
}
mutex_unlock(&lport->lp_mutex);
return rc;
}
EXPORT_SYMBOL(fc_fabric_login);
/**
* fc_linkup() - Handler for transport linkup events
* @lport: The lport whose link is up
*/
void fc_linkup(struct fc_lport *lport)
{
printk(KERN_INFO "libfc: Link up on port (%6x)\n",
fc_host_port_id(lport->host));
mutex_lock(&lport->lp_mutex);
if (!lport->link_up) {
lport->link_up = 1;
if (lport->state == LPORT_ST_RESET)
fc_lport_enter_flogi(lport);
}
mutex_unlock(&lport->lp_mutex);
}
EXPORT_SYMBOL(fc_linkup);
/**
* fc_linkdown() - Handler for transport linkdown events
* @lport: The lport whose link is down
*/
void fc_linkdown(struct fc_lport *lport)
{
mutex_lock(&lport->lp_mutex);
printk(KERN_INFO "libfc: Link down on port (%6x)\n",
fc_host_port_id(lport->host));
if (lport->link_up) {
lport->link_up = 0;
fc_lport_enter_reset(lport);
lport->tt.fcp_cleanup(lport);
}
mutex_unlock(&lport->lp_mutex);
}
EXPORT_SYMBOL(fc_linkdown);
/**
* fc_fabric_logoff() - Logout of the fabric
* @lport: fc_lport pointer to logoff the fabric
*
* Return value:
* 0 for success, -1 for failure
*/
int fc_fabric_logoff(struct fc_lport *lport)
{
lport->tt.disc_stop_final(lport);
mutex_lock(&lport->lp_mutex);
if (lport->dns_rp)
lport->tt.rport_logoff(lport->dns_rp);
mutex_unlock(&lport->lp_mutex);
lport->tt.rport_flush_queue();
mutex_lock(&lport->lp_mutex);
fc_lport_enter_logo(lport);
mutex_unlock(&lport->lp_mutex);
cancel_delayed_work_sync(&lport->retry_work);
return 0;
}
EXPORT_SYMBOL(fc_fabric_logoff);
/**
* fc_lport_destroy() - unregister a fc_lport
* @lport: fc_lport pointer to unregister
*
* Return value:
* None
* Note:
* exit routine for fc_lport instance
* clean-up all the allocated memory
* and free up other system resources.
*
*/
int fc_lport_destroy(struct fc_lport *lport)
{
mutex_lock(&lport->lp_mutex);
lport->state = LPORT_ST_DISABLED;
lport->link_up = 0;
lport->tt.frame_send = fc_frame_drop;
mutex_unlock(&lport->lp_mutex);
lport->tt.fcp_abort_io(lport);
lport->tt.disc_stop_final(lport);
lport->tt.exch_mgr_reset(lport, 0, 0);
return 0;
}
EXPORT_SYMBOL(fc_lport_destroy);
/**
* fc_set_mfs() - sets up the mfs for the corresponding fc_lport
* @lport: fc_lport pointer to unregister
* @mfs: the new mfs for fc_lport
*
* Set mfs for the given fc_lport to the new mfs.
*
* Return: 0 for success
*/
int fc_set_mfs(struct fc_lport *lport, u32 mfs)
{
unsigned int old_mfs;
int rc = -EINVAL;
mutex_lock(&lport->lp_mutex);
old_mfs = lport->mfs;
if (mfs >= FC_MIN_MAX_FRAME) {
mfs &= ~3;
if (mfs > FC_MAX_FRAME)
mfs = FC_MAX_FRAME;
mfs -= sizeof(struct fc_frame_header);
lport->mfs = mfs;
rc = 0;
}
if (!rc && mfs < old_mfs)
fc_lport_enter_reset(lport);
mutex_unlock(&lport->lp_mutex);
return rc;
}
EXPORT_SYMBOL(fc_set_mfs);
/**
* fc_lport_disc_callback() - Callback for discovery events
* @lport: FC local port
* @event: The discovery event
*/
void fc_lport_disc_callback(struct fc_lport *lport, enum fc_disc_event event)
{
switch (event) {
case DISC_EV_SUCCESS:
FC_LPORT_DBG(lport, "Discovery succeeded\n");
break;
case DISC_EV_FAILED:
printk(KERN_ERR "libfc: Discovery failed for port (%6x)\n",
fc_host_port_id(lport->host));
mutex_lock(&lport->lp_mutex);
fc_lport_enter_reset(lport);
mutex_unlock(&lport->lp_mutex);
break;
case DISC_EV_NONE:
WARN_ON(1);
break;
}
}
/**
* fc_rport_enter_ready() - Enter the ready state and start discovery
* @lport: Fibre Channel local port that is ready
*
* Locking Note: The lport lock is expected to be held before calling
* this routine.
*/
static void fc_lport_enter_ready(struct fc_lport *lport)
{
FC_LPORT_DBG(lport, "Entered READY from state %s\n",
fc_lport_state(lport));
fc_lport_state_enter(lport, LPORT_ST_READY);
if (!lport->ptp_rp)
lport->tt.disc_start(fc_lport_disc_callback, lport);
}
/**
* fc_lport_recv_flogi_req() - Receive a FLOGI request
* @sp_in: The sequence the FLOGI is on
* @rx_fp: The frame the FLOGI is in
* @lport: The lport that recieved the request
*
* A received FLOGI request indicates a point-to-point connection.
* Accept it with the common service parameters indicating our N port.
* Set up to do a PLOGI if we have the higher-number WWPN.
*
* Locking Note: The lport lock is expected to be held before calling
* this function.
*/
static void fc_lport_recv_flogi_req(struct fc_seq *sp_in,
struct fc_frame *rx_fp,
struct fc_lport *lport)
{
struct fc_frame *fp;
struct fc_frame_header *fh;
struct fc_seq *sp;
struct fc_exch *ep;
struct fc_els_flogi *flp;
struct fc_els_flogi *new_flp;
u64 remote_wwpn;
u32 remote_fid;
u32 local_fid;
u32 f_ctl;
FC_LPORT_DBG(lport, "Received FLOGI request while in state %s\n",
fc_lport_state(lport));
fh = fc_frame_header_get(rx_fp);
remote_fid = ntoh24(fh->fh_s_id);
flp = fc_frame_payload_get(rx_fp, sizeof(*flp));
if (!flp)
goto out;
remote_wwpn = get_unaligned_be64(&flp->fl_wwpn);
if (remote_wwpn == lport->wwpn) {
printk(KERN_WARNING "libfc: Received FLOGI from port "
"with same WWPN %llx\n", remote_wwpn);
goto out;
}
FC_LPORT_DBG(lport, "FLOGI from port WWPN %llx\n", remote_wwpn);
/*
* XXX what is the right thing to do for FIDs?
* The originator might expect our S_ID to be 0xfffffe.
* But if so, both of us could end up with the same FID.
*/
local_fid = FC_LOCAL_PTP_FID_LO;
if (remote_wwpn < lport->wwpn) {
local_fid = FC_LOCAL_PTP_FID_HI;
if (!remote_fid || remote_fid == local_fid)
remote_fid = FC_LOCAL_PTP_FID_LO;
} else if (!remote_fid) {
remote_fid = FC_LOCAL_PTP_FID_HI;
}
fc_host_port_id(lport->host) = local_fid;
fp = fc_frame_alloc(lport, sizeof(*flp));
if (fp) {
sp = lport->tt.seq_start_next(fr_seq(rx_fp));
new_flp = fc_frame_payload_get(fp, sizeof(*flp));
fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI);
new_flp->fl_cmd = (u8) ELS_LS_ACC;
/*
* Send the response. If this fails, the originator should
* repeat the sequence.
*/
f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ;
ep = fc_seq_exch(sp);
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
FC_TYPE_ELS, f_ctl, 0);
lport->tt.seq_send(lport, sp, fp);
} else {
fc_lport_error(lport, fp);
}
fc_lport_ptp_setup(lport, remote_fid, remote_wwpn,
get_unaligned_be64(&flp->fl_wwnn));
out:
sp = fr_seq(rx_fp);
fc_frame_free(rx_fp);
}
/**
* fc_lport_recv_req() - The generic lport request handler
* @lport: The lport that received the request
* @sp: The sequence the request is on
* @fp: The frame the request is in
*
* This function will see if the lport handles the request or
* if an rport should handle the request.
*
* Locking Note: This function should not be called with the lport
* lock held becuase it will grab the lock.
*/
static void fc_lport_recv_req(struct fc_lport *lport, struct fc_seq *sp,
struct fc_frame *fp)
{
struct fc_frame_header *fh = fc_frame_header_get(fp);
void (*recv) (struct fc_seq *, struct fc_frame *, struct fc_lport *);
mutex_lock(&lport->lp_mutex);
/*
* Handle special ELS cases like FLOGI, LOGO, and
* RSCN here. These don't require a session.
* Even if we had a session, it might not be ready.
*/
if (!lport->link_up)
fc_frame_free(fp);
else if (fh->fh_type == FC_TYPE_ELS &&
fh->fh_r_ctl == FC_RCTL_ELS_REQ) {
/*
* Check opcode.
*/
recv = lport->tt.rport_recv_req;
switch (fc_frame_payload_op(fp)) {
case ELS_FLOGI:
recv = fc_lport_recv_flogi_req;
break;
case ELS_LOGO:
fh = fc_frame_header_get(fp);
if (ntoh24(fh->fh_s_id) == FC_FID_FLOGI)
recv = fc_lport_recv_logo_req;
break;
case ELS_RSCN:
recv = lport->tt.disc_recv_req;
break;
case ELS_ECHO:
recv = fc_lport_recv_echo_req;
break;
case ELS_RLIR:
recv = fc_lport_recv_rlir_req;
break;
case ELS_RNID:
recv = fc_lport_recv_rnid_req;
break;
}
recv(sp, fp, lport);
} else {
FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)\n",
fr_eof(fp));
fc_frame_free(fp);
}
mutex_unlock(&lport->lp_mutex);
/*
* The common exch_done for all request may not be good
* if any request requires longer hold on exhange. XXX
*/
lport->tt.exch_done(sp);
}
/**
* fc_lport_reset() - Reset an lport
* @lport: The lport which should be reset
*
* Locking Note: This functions should not be called with the
* lport lock held.
*/
int fc_lport_reset(struct fc_lport *lport)
{
cancel_delayed_work_sync(&lport->retry_work);
mutex_lock(&lport->lp_mutex);
fc_lport_enter_reset(lport);
mutex_unlock(&lport->lp_mutex);
return 0;
}
EXPORT_SYMBOL(fc_lport_reset);
/**
* fc_lport_reset_locked() - Reset the local port
* @lport: Fibre Channel local port to be reset
*
* Locking Note: The lport lock is expected to be held before calling
* this routine.
*/
static void fc_lport_reset_locked(struct fc_lport *lport)
{
if (lport->dns_rp)
lport->tt.rport_logoff(lport->dns_rp);
lport->ptp_rp = NULL;
lport->tt.disc_stop(lport);
lport->tt.exch_mgr_reset(lport, 0, 0);
fc_host_fabric_name(lport->host) = 0;
fc_host_port_id(lport->host) = 0;
}
/**
* fc_lport_enter_reset() - Reset the local port
* @lport: Fibre Channel local port to be reset
*
* Locking Note: The lport lock is expected to be held before calling
* this routine.
*/
static void fc_lport_enter_reset(struct fc_lport *lport)
{
FC_LPORT_DBG(lport, "Entered RESET state from %s state\n",
fc_lport_state(lport));
fc_lport_state_enter(lport, LPORT_ST_RESET);
fc_lport_reset_locked(lport);
if (lport->link_up)
fc_lport_enter_flogi(lport);
}
/**
* fc_lport_enter_disabled() - disable the local port
* @lport: Fibre Channel local port to be reset
*
* Locking Note: The lport lock is expected to be held before calling
* this routine.
*/
static void fc_lport_enter_disabled(struct fc_lport *lport)
{
FC_LPORT_DBG(lport, "Entered disabled state from %s state\n",
fc_lport_state(lport));
fc_lport_state_enter(lport, LPORT_ST_DISABLED);
fc_lport_reset_locked(lport);
}
/**
* fc_lport_error() - Handler for any errors
* @lport: The fc_lport object
* @fp: The frame pointer
*
* If the error was caused by a resource allocation failure
* then wait for half a second and retry, otherwise retry
* after the e_d_tov time.
*/
static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp)
{
unsigned long delay = 0;
FC_LPORT_DBG(lport, "Error %ld in state %s, retries %d\n",
PTR_ERR(fp), fc_lport_state(lport),
lport->retry_count);
if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) {
/*
* Memory allocation failure, or the exchange timed out.
* Retry after delay
*/
if (lport->retry_count < lport->max_retry_count) {
lport->retry_count++;
if (!fp)
delay = msecs_to_jiffies(500);
else
delay = msecs_to_jiffies(lport->e_d_tov);
schedule_delayed_work(&lport->retry_work, delay);
} else {
switch (lport->state) {
case LPORT_ST_DISABLED:
case LPORT_ST_READY:
case LPORT_ST_RESET:
case LPORT_ST_RPN_ID:
case LPORT_ST_RFT_ID:
case LPORT_ST_SCR:
case LPORT_ST_DNS:
case LPORT_ST_FLOGI:
case LPORT_ST_LOGO:
fc_lport_enter_reset(lport);
break;
}
}
}
}
/**
* fc_lport_rft_id_resp() - Handle response to Register Fibre
* Channel Types by ID (RPN_ID) request
* @sp: current sequence in RPN_ID exchange
* @fp: response frame
* @lp_arg: Fibre Channel host port instance
*
* Locking Note: This function will be called without the lport lock
* held, but it will lock, call an _enter_* function or fc_lport_error
* and then unlock the lport.
*/
static void fc_lport_rft_id_resp(struct fc_seq *sp, struct fc_frame *fp,
void *lp_arg)
{
struct fc_lport *lport = lp_arg;
struct fc_frame_header *fh;
struct fc_ct_hdr *ct;
FC_LPORT_DBG(lport, "Received a RFT_ID %s\n", fc_els_resp_type(fp));
if (fp == ERR_PTR(-FC_EX_CLOSED))
return;
mutex_lock(&lport->lp_mutex);
if (lport->state != LPORT_ST_RFT_ID) {
FC_LPORT_DBG(lport, "Received a RFT_ID response, but in state "
"%s\n", fc_lport_state(lport));
if (IS_ERR(fp))
goto err;
goto out;
}
if (IS_ERR(fp)) {
fc_lport_error(lport, fp);
goto err;
}
fh = fc_frame_header_get(fp);
ct = fc_frame_payload_get(fp, sizeof(*ct));
if (fh && ct && fh->fh_type == FC_TYPE_CT &&
ct->ct_fs_type == FC_FST_DIR &&
ct->ct_fs_subtype == FC_NS_SUBTYPE &&
ntohs(ct->ct_cmd) == FC_FS_ACC)
fc_lport_enter_scr(lport);
else
fc_lport_error(lport, fp);
out:
fc_frame_free(fp);
err:
mutex_unlock(&lport->lp_mutex);
}
/**
* fc_lport_rpn_id_resp() - Handle response to Register Port
* Name by ID (RPN_ID) request
* @sp: current sequence in RPN_ID exchange
* @fp: response frame
* @lp_arg: Fibre Channel host port instance
*
* Locking Note: This function will be called without the lport lock
* held, but it will lock, call an _enter_* function or fc_lport_error
* and then unlock the lport.
*/
static void fc_lport_rpn_id_resp(struct fc_seq *sp, struct fc_frame *fp,
void *lp_arg)
{
struct fc_lport *lport = lp_arg;
struct fc_frame_header *fh;
struct fc_ct_hdr *ct;
FC_LPORT_DBG(lport, "Received a RPN_ID %s\n", fc_els_resp_type(fp));
if (fp == ERR_PTR(-FC_EX_CLOSED))
return;
mutex_lock(&lport->lp_mutex);
if (lport->state != LPORT_ST_RPN_ID) {
FC_LPORT_DBG(lport, "Received a RPN_ID response, but in state "
"%s\n", fc_lport_state(lport));
if (IS_ERR(fp))
goto err;
goto out;
}
if (IS_ERR(fp)) {
fc_lport_error(lport, fp);
goto err;
}
fh = fc_frame_header_get(fp);
ct = fc_frame_payload_get(fp, sizeof(*ct));
if (fh && ct && fh->fh_type == FC_TYPE_CT &&
ct->ct_fs_type == FC_FST_DIR &&
ct->ct_fs_subtype == FC_NS_SUBTYPE &&
ntohs(ct->ct_cmd) == FC_FS_ACC)
fc_lport_enter_rft_id(lport);
else
fc_lport_error(lport, fp);
out:
fc_frame_free(fp);
err:
mutex_unlock(&lport->lp_mutex);
}
/**
* fc_lport_scr_resp() - Handle response to State Change Register (SCR) request
* @sp: current sequence in SCR exchange
* @fp: response frame
* @lp_arg: Fibre Channel lport port instance that sent the registration request
*
* Locking Note: This function will be called without the lport lock
* held, but it will lock, call an _enter_* function or fc_lport_error
* and then unlock the lport.
*/
static void fc_lport_scr_resp(struct fc_seq *sp, struct fc_frame *fp,
void *lp_arg)
{
struct fc_lport *lport = lp_arg;
u8 op;
FC_LPORT_DBG(lport, "Received a SCR %s\n", fc_els_resp_type(fp));
if (fp == ERR_PTR(-FC_EX_CLOSED))
return;
mutex_lock(&lport->lp_mutex);
if (lport->state != LPORT_ST_SCR) {
FC_LPORT_DBG(lport, "Received a SCR response, but in state "
"%s\n", fc_lport_state(lport));
if (IS_ERR(fp))
goto err;
goto out;
}
if (IS_ERR(fp)) {
fc_lport_error(lport, fp);
goto err;
}
op = fc_frame_payload_op(fp);
if (op == ELS_LS_ACC)
fc_lport_enter_ready(lport);
else
fc_lport_error(lport, fp);
out:
fc_frame_free(fp);
err:
mutex_unlock(&lport->lp_mutex);
}
/**
* fc_lport_enter_scr() - Send a State Change Register (SCR) request
* @lport: Fibre Channel local port to register for state changes
*
* Locking Note: The lport lock is expected to be held before calling
* this routine.
*/
static void fc_lport_enter_scr(struct fc_lport *lport)
{
struct fc_frame *fp;
FC_LPORT_DBG(lport, "Entered SCR state from %s state\n",
fc_lport_state(lport));
fc_lport_state_enter(lport, LPORT_ST_SCR);
fp = fc_frame_alloc(lport, sizeof(struct fc_els_scr));
if (!fp) {
fc_lport_error(lport, fp);
return;
}
if (!lport->tt.elsct_send(lport, FC_FID_FCTRL, fp, ELS_SCR,
fc_lport_scr_resp, lport, lport->e_d_tov))
fc_lport_error(lport, NULL);
}
/**
* fc_lport_enter_rft_id() - Register FC4-types with the name server
* @lport: Fibre Channel local port to register
*
* Locking Note: The lport lock is expected to be held before calling
* this routine.
*/
static void fc_lport_enter_rft_id(struct fc_lport *lport)
{
struct fc_frame *fp;
struct fc_ns_fts *lps;
int i;
FC_LPORT_DBG(lport, "Entered RFT_ID state from %s state\n",
fc_lport_state(lport));
fc_lport_state_enter(lport, LPORT_ST_RFT_ID);
lps = &lport->fcts;
i = sizeof(lps->ff_type_map) / sizeof(lps->ff_type_map[0]);
while (--i >= 0)
if (ntohl(lps->ff_type_map[i]) != 0)
break;
if (i < 0) {
/* nothing to register, move on to SCR */
fc_lport_enter_scr(lport);
return;
}
fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
sizeof(struct fc_ns_rft));
if (!fp) {
fc_lport_error(lport, fp);
return;
}
if (!lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RFT_ID,
fc_lport_rft_id_resp,
lport, lport->e_d_tov))
fc_lport_error(lport, fp);
}
/**
* fc_rport_enter_rft_id() - Register port name with the name server
* @lport: Fibre Channel local port to register
*
* Locking Note: The lport lock is expected to be held before calling
* this routine.
*/
static void fc_lport_enter_rpn_id(struct fc_lport *lport)
{
struct fc_frame *fp;
FC_LPORT_DBG(lport, "Entered RPN_ID state from %s state\n",
fc_lport_state(lport));
fc_lport_state_enter(lport, LPORT_ST_RPN_ID);
fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
sizeof(struct fc_ns_rn_id));
if (!fp) {
fc_lport_error(lport, fp);
return;
}
if (!lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RPN_ID,
fc_lport_rpn_id_resp,
lport, lport->e_d_tov))
fc_lport_error(lport, NULL);
}
static struct fc_rport_operations fc_lport_rport_ops = {
.event_callback = fc_lport_rport_callback,
};
/**
* fc_rport_enter_dns() - Create a rport to the name server
* @lport: Fibre Channel local port requesting a rport for the name server
*
* Locking Note: The lport lock is expected to be held before calling
* this routine.
*/
static void fc_lport_enter_dns(struct fc_lport *lport)
{
struct fc_rport_priv *rdata;
FC_LPORT_DBG(lport, "Entered DNS state from %s state\n",
fc_lport_state(lport));
fc_lport_state_enter(lport, LPORT_ST_DNS);
mutex_lock(&lport->disc.disc_mutex);
rdata = lport->tt.rport_create(lport, FC_FID_DIR_SERV);
mutex_unlock(&lport->disc.disc_mutex);
if (!rdata)
goto err;
rdata->ops = &fc_lport_rport_ops;
lport->tt.rport_login(rdata);
return;
err:
fc_lport_error(lport, NULL);
}
/**
* fc_lport_timeout() - Handler for the retry_work timer.
* @work: The work struct of the fc_lport
*/
static void fc_lport_timeout(struct work_struct *work)
{
struct fc_lport *lport =
container_of(work, struct fc_lport,
retry_work.work);
mutex_lock(&lport->lp_mutex);
switch (lport->state) {
case LPORT_ST_DISABLED:
WARN_ON(1);
break;
case LPORT_ST_READY:
WARN_ON(1);
break;
case LPORT_ST_RESET:
break;
case LPORT_ST_FLOGI:
fc_lport_enter_flogi(lport);
break;
case LPORT_ST_DNS:
fc_lport_enter_dns(lport);
break;
case LPORT_ST_RPN_ID:
fc_lport_enter_rpn_id(lport);
break;
case LPORT_ST_RFT_ID:
fc_lport_enter_rft_id(lport);
break;
case LPORT_ST_SCR:
fc_lport_enter_scr(lport);
break;
case LPORT_ST_LOGO:
fc_lport_enter_logo(lport);
break;
}
mutex_unlock(&lport->lp_mutex);
}
/**
* fc_lport_logo_resp() - Handle response to LOGO request
* @sp: current sequence in LOGO exchange
* @fp: response frame
* @lp_arg: Fibre Channel lport port instance that sent the LOGO request
*
* Locking Note: This function will be called without the lport lock
* held, but it will lock, call an _enter_* function or fc_lport_error
* and then unlock the lport.
*/
static void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
void *lp_arg)
{
struct fc_lport *lport = lp_arg;
u8 op;
FC_LPORT_DBG(lport, "Received a LOGO %s\n", fc_els_resp_type(fp));
if (fp == ERR_PTR(-FC_EX_CLOSED))
return;
mutex_lock(&lport->lp_mutex);
if (lport->state != LPORT_ST_LOGO) {
FC_LPORT_DBG(lport, "Received a LOGO response, but in state "
"%s\n", fc_lport_state(lport));
if (IS_ERR(fp))
goto err;
goto out;
}
if (IS_ERR(fp)) {
fc_lport_error(lport, fp);
goto err;
}
op = fc_frame_payload_op(fp);
if (op == ELS_LS_ACC)
fc_lport_enter_disabled(lport);
else
fc_lport_error(lport, fp);
out:
fc_frame_free(fp);
err:
mutex_unlock(&lport->lp_mutex);
}
/**
* fc_rport_enter_logo() - Logout of the fabric
* @lport: Fibre Channel local port to be logged out
*
* Locking Note: The lport lock is expected to be held before calling
* this routine.
*/
static void fc_lport_enter_logo(struct fc_lport *lport)
{
struct fc_frame *fp;
struct fc_els_logo *logo;
FC_LPORT_DBG(lport, "Entered LOGO state from %s state\n",
fc_lport_state(lport));
fc_lport_state_enter(lport, LPORT_ST_LOGO);
fp = fc_frame_alloc(lport, sizeof(*logo));
if (!fp) {
fc_lport_error(lport, fp);
return;
}
if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp, ELS_LOGO,
fc_lport_logo_resp, lport, lport->e_d_tov))
fc_lport_error(lport, NULL);
}
/**
* fc_lport_flogi_resp() - Handle response to FLOGI request
* @sp: current sequence in FLOGI exchange
* @fp: response frame
* @lp_arg: Fibre Channel lport port instance that sent the FLOGI request
*
* Locking Note: This function will be called without the lport lock
* held, but it will lock, call an _enter_* function or fc_lport_error
* and then unlock the lport.
*/
static void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
void *lp_arg)
{
struct fc_lport *lport = lp_arg;
struct fc_frame_header *fh;
struct fc_els_flogi *flp;
u32 did;
u16 csp_flags;
unsigned int r_a_tov;
unsigned int e_d_tov;
u16 mfs;
FC_LPORT_DBG(lport, "Received a FLOGI %s\n", fc_els_resp_type(fp));
if (fp == ERR_PTR(-FC_EX_CLOSED))
return;
mutex_lock(&lport->lp_mutex);
if (lport->state != LPORT_ST_FLOGI) {
FC_LPORT_DBG(lport, "Received a FLOGI response, but in state "
"%s\n", fc_lport_state(lport));
if (IS_ERR(fp))
goto err;
goto out;
}
if (IS_ERR(fp)) {
fc_lport_error(lport, fp);
goto err;
}
fh = fc_frame_header_get(fp);
did = ntoh24(fh->fh_d_id);
if (fc_frame_payload_op(fp) == ELS_LS_ACC && did != 0) {
printk(KERN_INFO "libfc: Assigned FID (%6x) in FLOGI response\n",
did);
fc_host_port_id(lport->host) = did;
flp = fc_frame_payload_get(fp, sizeof(*flp));
if (flp) {
mfs = ntohs(flp->fl_csp.sp_bb_data) &
FC_SP_BB_DATA_MASK;
if (mfs >= FC_SP_MIN_MAX_PAYLOAD &&
mfs < lport->mfs)
lport->mfs = mfs;
csp_flags = ntohs(flp->fl_csp.sp_features);
r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov);
e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov);
if (csp_flags & FC_SP_FT_EDTR)
e_d_tov /= 1000000;
if ((csp_flags & FC_SP_FT_FPORT) == 0) {
if (e_d_tov > lport->e_d_tov)
lport->e_d_tov = e_d_tov;
lport->r_a_tov = 2 * e_d_tov;
printk(KERN_INFO "libfc: Port (%6x) entered "
"point to point mode\n", did);
fc_lport_ptp_setup(lport, ntoh24(fh->fh_s_id),
get_unaligned_be64(
&flp->fl_wwpn),
get_unaligned_be64(
&flp->fl_wwnn));
} else {
lport->e_d_tov = e_d_tov;
lport->r_a_tov = r_a_tov;
fc_host_fabric_name(lport->host) =
get_unaligned_be64(&flp->fl_wwnn);
fc_lport_enter_dns(lport);
}
}
} else {
FC_LPORT_DBG(lport, "Bad FLOGI response\n");
}
out:
fc_frame_free(fp);
err:
mutex_unlock(&lport->lp_mutex);
}
/**
* fc_rport_enter_flogi() - Send a FLOGI request to the fabric manager
* @lport: Fibre Channel local port to be logged in to the fabric
*
* Locking Note: The lport lock is expected to be held before calling
* this routine.
*/
void fc_lport_enter_flogi(struct fc_lport *lport)
{
struct fc_frame *fp;
FC_LPORT_DBG(lport, "Entered FLOGI state from %s state\n",
fc_lport_state(lport));
fc_lport_state_enter(lport, LPORT_ST_FLOGI);
fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
if (!fp)
return fc_lport_error(lport, fp);
if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp, ELS_FLOGI,
fc_lport_flogi_resp, lport, lport->e_d_tov))
fc_lport_error(lport, NULL);
}
/* Configure a fc_lport */
int fc_lport_config(struct fc_lport *lport)
{
INIT_DELAYED_WORK(&lport->retry_work, fc_lport_timeout);
mutex_init(&lport->lp_mutex);
fc_lport_state_enter(lport, LPORT_ST_DISABLED);
fc_lport_add_fc4_type(lport, FC_TYPE_FCP);
fc_lport_add_fc4_type(lport, FC_TYPE_CT);
return 0;
}
EXPORT_SYMBOL(fc_lport_config);
int fc_lport_init(struct fc_lport *lport)
{
if (!lport->tt.lport_recv)
lport->tt.lport_recv = fc_lport_recv_req;
if (!lport->tt.lport_reset)
lport->tt.lport_reset = fc_lport_reset;
fc_host_port_type(lport->host) = FC_PORTTYPE_NPORT;
fc_host_node_name(lport->host) = lport->wwnn;
fc_host_port_name(lport->host) = lport->wwpn;
fc_host_supported_classes(lport->host) = FC_COS_CLASS3;
memset(fc_host_supported_fc4s(lport->host), 0,
sizeof(fc_host_supported_fc4s(lport->host)));
fc_host_supported_fc4s(lport->host)[2] = 1;
fc_host_supported_fc4s(lport->host)[7] = 1;
/* This value is also unchanging */
memset(fc_host_active_fc4s(lport->host), 0,
sizeof(fc_host_active_fc4s(lport->host)));
fc_host_active_fc4s(lport->host)[2] = 1;
fc_host_active_fc4s(lport->host)[7] = 1;
fc_host_maxframe_size(lport->host) = lport->mfs;
fc_host_supported_speeds(lport->host) = 0;
if (lport->link_supported_speeds & FC_PORTSPEED_1GBIT)
fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT;
if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT)
fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT;
INIT_LIST_HEAD(&lport->ema_list);
return 0;
}
EXPORT_SYMBOL(fc_lport_init);