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linux/drivers/scsi/libfc/fc_lport.c
Javed Hasan 974db67a51 scsi: libfc: FDMI enhancements 
Add all the attributes for FDMI.

Fall back mechanism is added in between FDMI V2 and FDMI V1 attributes. In
case FDMI get fails for V2 attributes we fall back to V1 attributes.

Link: https://lore.kernel.org/r/20210603121623.10084-5-jhasan@marvell.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Javed Hasan <jhasan@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2021-06-10 00:03:56 -04:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright(c) 2007 Intel Corporation. All rights reserved.
*
* 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.
*
* HIERARCHY
*
* The following hierarchy 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 hierarchy-
*
* 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 because 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, successful 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 <linux/delay.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <asm/unaligned.h>
#include <scsi/fc/fc_gs.h>
#include <scsi/libfc.h>
#include <linux/scatterlist.h>
#include "fc_encode.h"
#include "fc_libfc.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)*/
#define MAX_CT_PAYLOAD 2048
#define DISCOVERED_PORTS 4
#define NUMBER_OF_PORTS 1
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_ns(struct fc_lport *, enum fc_lport_state);
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 void fc_lport_enter_fdmi(struct fc_lport *lport);
static void fc_lport_enter_ms(struct fc_lport *, enum fc_lport_state);
static const char *fc_lport_state_names[] = {
[LPORT_ST_DISABLED] = "disabled",
[LPORT_ST_FLOGI] = "FLOGI",
[LPORT_ST_DNS] = "dNS",
[LPORT_ST_RNN_ID] = "RNN_ID",
[LPORT_ST_RSNN_NN] = "RSNN_NN",
[LPORT_ST_RSPN_ID] = "RSPN_ID",
[LPORT_ST_RFT_ID] = "RFT_ID",
[LPORT_ST_RFF_ID] = "RFF_ID",
[LPORT_ST_FDMI] = "FDMI",
[LPORT_ST_RHBA] = "RHBA",
[LPORT_ST_RPA] = "RPA",
[LPORT_ST_DHBA] = "DHBA",
[LPORT_ST_DPRT] = "DPRT",
[LPORT_ST_SCR] = "SCR",
[LPORT_ST_READY] = "Ready",
[LPORT_ST_LOGO] = "LOGO",
[LPORT_ST_RESET] = "reset",
};
/**
* struct fc_bsg_info - FC Passthrough managemet structure
* @job: The passthrough job
* @lport: The local port to pass through a command
* @rsp_code: The expected response code
* @sg: job->reply_payload.sg_list
* @nents: job->reply_payload.sg_cnt
* @offset: The offset into the response data
*/
struct fc_bsg_info {
struct bsg_job *job;
struct fc_lport *lport;
u16 rsp_code;
struct scatterlist *sg;
u32 nents;
size_t offset;
};
/**
* fc_frame_drop() - Dummy frame handler
* @lport: The local port the frame was received on
* @fp: The received frame
*/
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 occurred
*
* 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 (%6.6x)\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_rdata = rdata;
fc_lport_enter_ns(lport, LPORT_ST_RNN_ID);
} else if (lport->state == LPORT_ST_FDMI) {
lport->ms_rdata = rdata;
fc_lport_enter_ms(lport, LPORT_ST_DHBA);
} else {
FC_LPORT_DBG(lport, "Received an READY event "
"on port (%6.6x) for the directory "
"server, but the lport is not "
"in the DNS or FDMI state, it's in the "
"%d state", rdata->ids.port_id,
lport->state);
fc_rport_logoff(rdata);
}
break;
case RPORT_EV_LOGO:
case RPORT_EV_FAILED:
case RPORT_EV_STOP:
if (rdata->ids.port_id == FC_FID_DIR_SERV)
lport->dns_rdata = NULL;
else if (rdata->ids.port_id == FC_FID_MGMT_SERV)
lport->ms_rdata = 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
* @remote_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)
{
lockdep_assert_held(&lport->lp_mutex);
if (lport->ptp_rdata) {
fc_rport_logoff(lport->ptp_rdata);
kref_put(&lport->ptp_rdata->kref, fc_rport_destroy);
}
mutex_lock(&lport->disc.disc_mutex);
lport->ptp_rdata = fc_rport_create(lport, remote_fid);
kref_get(&lport->ptp_rdata->kref);
lport->ptp_rdata->ids.port_name = remote_wwpn;
lport->ptp_rdata->ids.node_name = remote_wwnn;
mutex_unlock(&lport->disc.disc_mutex);
fc_rport_login(lport->ptp_rdata);
fc_lport_enter_ready(lport);
}
/**
* fc_get_host_port_state() - Return the port state of the given Scsi_Host
* @shost: The SCSI host whose port state is to be determined
*/
void fc_get_host_port_state(struct Scsi_Host *shost)
{
struct fc_lport *lport = shost_priv(shost);
mutex_lock(&lport->lp_mutex);
if (!lport->link_up)
fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
else
switch (lport->state) {
case LPORT_ST_READY:
fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
break;
default:
fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
}
mutex_unlock(&lport->lp_mutex);
}
EXPORT_SYMBOL(fc_get_host_port_state);
/**
* fc_get_host_speed() - Return the speed of the given Scsi_Host
* @shost: The SCSI host whose port speed is to be determined
*/
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);
/**
* fc_get_host_stats() - Return the Scsi_Host's statistics
* @shost: The SCSI host whose statistics are to be returned
*/
struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost)
{
struct fc_host_statistics *fc_stats;
struct fc_lport *lport = shost_priv(shost);
unsigned int cpu;
u64 fcp_in_bytes = 0;
u64 fcp_out_bytes = 0;
fc_stats = &lport->host_stats;
memset(fc_stats, 0, sizeof(struct fc_host_statistics));
fc_stats->seconds_since_last_reset = (jiffies - lport->boot_time) / HZ;
for_each_possible_cpu(cpu) {
struct fc_stats *stats;
stats = per_cpu_ptr(lport->stats, cpu);
fc_stats->tx_frames += stats->TxFrames;
fc_stats->tx_words += stats->TxWords;
fc_stats->rx_frames += stats->RxFrames;
fc_stats->rx_words += stats->RxWords;
fc_stats->error_frames += stats->ErrorFrames;
fc_stats->invalid_crc_count += stats->InvalidCRCCount;
fc_stats->fcp_input_requests += stats->InputRequests;
fc_stats->fcp_output_requests += stats->OutputRequests;
fc_stats->fcp_control_requests += stats->ControlRequests;
fcp_in_bytes += stats->InputBytes;
fcp_out_bytes += stats->OutputBytes;
fc_stats->fcp_packet_alloc_failures += stats->FcpPktAllocFails;
fc_stats->fcp_packet_aborts += stats->FcpPktAborts;
fc_stats->fcp_frame_alloc_failures += stats->FcpFrameAllocFails;
fc_stats->link_failure_count += stats->LinkFailureCount;
}
fc_stats->fcp_input_megabytes = div_u64(fcp_in_bytes, 1000000);
fc_stats->fcp_output_megabytes = div_u64(fcp_out_bytes, 1000000);
fc_stats->lip_count = -1;
fc_stats->nos_count = -1;
fc_stats->loss_of_sync_count = -1;
fc_stats->loss_of_signal_count = -1;
fc_stats->prim_seq_protocol_err_count = -1;
fc_stats->dumped_frames = -1;
/* update exches stats */
fc_exch_update_stats(lport);
return fc_stats;
}
EXPORT_SYMBOL(fc_get_host_stats);
/**
* fc_lport_flogi_fill() - Fill in FLOGI command for request
* @lport: The local port the FLOGI is for
* @flogi: The FLOGI command
* @op: The opcode
*/
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;
}
}
/**
* fc_lport_add_fc4_type() - Add a supported FC-4 type to a local port
* @lport: The local port to add a new FC-4 type to
* @type: The new 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 receiving the RLIR
* @fp: The RLIR request frame
*/
static void fc_lport_recv_rlir_req(struct fc_lport *lport, struct fc_frame *fp)
{
lockdep_assert_held(&lport->lp_mutex);
FC_LPORT_DBG(lport, "Received RLIR request while in state %s\n",
fc_lport_state(lport));
fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
fc_frame_free(fp);
}
/**
* fc_lport_recv_echo_req() - Handle received ECHO request
* @lport: The local port receiving the ECHO
* @in_fp: ECHO request frame
*/
static void fc_lport_recv_echo_req(struct fc_lport *lport,
struct fc_frame *in_fp)
{
struct fc_frame *fp;
unsigned int len;
void *pp;
void *dp;
lockdep_assert_held(&lport->lp_mutex);
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);
fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
lport->tt.frame_send(lport, fp);
}
fc_frame_free(in_fp);
}
/**
* fc_lport_recv_rnid_req() - Handle received Request Node ID data request
* @lport: The local port receiving the RNID
* @in_fp: The RNID request frame
*/
static void fc_lport_recv_rnid_req(struct fc_lport *lport,
struct fc_frame *in_fp)
{
struct fc_frame *fp;
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;
lockdep_assert_held(&lport->lp_mutex);
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.reason = ELS_RJT_LOGIC;
rjt_data.explan = ELS_EXPL_NONE;
fc_seq_els_rsp_send(in_fp, 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));
}
fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
lport->tt.frame_send(lport, fp);
}
}
fc_frame_free(in_fp);
}
/**
* fc_lport_recv_logo_req() - Handle received fabric LOGO request
* @lport: The local port receiving the LOGO
* @fp: The LOGO request frame
*/
static void fc_lport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp)
{
lockdep_assert_held(&lport->lp_mutex);
fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
fc_lport_enter_reset(lport);
fc_frame_free(fp);
}
/**
* fc_fabric_login() - Start the lport state machine
* @lport: The local port 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 ||
lport->state == LPORT_ST_LOGO) {
fc_lport_state_enter(lport, LPORT_ST_RESET);
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)
{
lockdep_assert_held(&lport->lp_mutex);
if (!lport->link_up) {
lport->link_up = 1;
if (lport->state == LPORT_ST_RESET)
fc_lport_enter_flogi(lport);
}
}
/**
* fc_linkup() - Handler for transport linkup events
* @lport: The local port whose link is up
*/
void fc_linkup(struct fc_lport *lport)
{
printk(KERN_INFO "host%d: libfc: Link up on port (%6.6x)\n",
lport->host->host_no, lport->port_id);
mutex_lock(&lport->lp_mutex);
__fc_linkup(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)
{
lockdep_assert_held(&lport->lp_mutex);
if (lport->link_up) {
lport->link_up = 0;
fc_lport_enter_reset(lport);
lport->tt.fcp_cleanup(lport);
}
}
/**
* fc_linkdown() - Handler for transport linkdown events
* @lport: The local port whose link is down
*/
void fc_linkdown(struct fc_lport *lport)
{
printk(KERN_INFO "host%d: libfc: Link down on port (%6.6x)\n",
lport->host->host_no, lport->port_id);
mutex_lock(&lport->lp_mutex);
__fc_linkdown(lport);
mutex_unlock(&lport->lp_mutex);
}
EXPORT_SYMBOL(fc_linkdown);
/**
* fc_fabric_logoff() - Logout of the fabric
* @lport: The local port 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_rdata)
fc_rport_logoff(lport->dns_rdata);
mutex_unlock(&lport->lp_mutex);
fc_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: The local port to unregister
*
* 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);
cancel_delayed_work_sync(&lport->retry_work);
fc_fc4_del_lport(lport);
return 0;
}
EXPORT_SYMBOL(fc_lport_destroy);
/**
* fc_set_mfs() - Set the maximum frame size for a local port
* @lport: The local port to set the MFS for
* @mfs: The new MFS
*/
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: The local port receiving the event
* @event: The discovery event
*/
static 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 "host%d: libfc: "
"Discovery failed for port (%6.6x)\n",
lport->host->host_no, lport->port_id);
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_lport_enter_ready() - Enter the ready state and start discovery
* @lport: The local port that is ready
*/
static void fc_lport_enter_ready(struct fc_lport *lport)
{
lockdep_assert_held(&lport->lp_mutex);
FC_LPORT_DBG(lport, "Entered READY from state %s\n",
fc_lport_state(lport));
fc_lport_state_enter(lport, LPORT_ST_READY);
if (lport->vport)
fc_vport_set_state(lport->vport, FC_VPORT_ACTIVE);
fc_vports_linkchange(lport);
if (!lport->ptp_rdata)
lport->tt.disc_start(fc_lport_disc_callback, lport);
}
/**
* fc_lport_set_port_id() - set the local port Port ID
* @lport: The local port which will have its Port ID set.
* @port_id: The new port ID.
* @fp: The frame containing the incoming request, or NULL.
*/
static void fc_lport_set_port_id(struct fc_lport *lport, u32 port_id,
struct fc_frame *fp)
{
lockdep_assert_held(&lport->lp_mutex);
if (port_id)
printk(KERN_INFO "host%d: Assigned Port ID %6.6x\n",
lport->host->host_no, port_id);
lport->port_id = port_id;
/* Update the fc_host */
fc_host_port_id(lport->host) = port_id;
if (lport->tt.lport_set_port_id)
lport->tt.lport_set_port_id(lport, port_id, fp);
}
/**
* fc_lport_set_local_id() - set the local port Port ID for point-to-multipoint
* @lport: The local port which will have its Port ID set.
* @port_id: The new port ID.
*
* Called by the lower-level driver when transport sets the local port_id.
* This is used in VN_port to VN_port mode for FCoE, and causes FLOGI and
* discovery to be skipped.
*/
void fc_lport_set_local_id(struct fc_lport *lport, u32 port_id)
{
mutex_lock(&lport->lp_mutex);
fc_lport_set_port_id(lport, port_id, NULL);
switch (lport->state) {
case LPORT_ST_RESET:
case LPORT_ST_FLOGI:
if (port_id)
fc_lport_enter_ready(lport);
break;
default:
break;
}
mutex_unlock(&lport->lp_mutex);
}
EXPORT_SYMBOL(fc_lport_set_local_id);
/**
* fc_lport_recv_flogi_req() - Receive a FLOGI request
* @lport: The local port that received the request
* @rx_fp: The FLOGI frame
*
* 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.
*/
static void fc_lport_recv_flogi_req(struct fc_lport *lport,
struct fc_frame *rx_fp)
{
struct fc_frame *fp;
struct fc_frame_header *fh;
struct fc_els_flogi *flp;
struct fc_els_flogi *new_flp;
u64 remote_wwpn;
u32 remote_fid;
u32 local_fid;
lockdep_assert_held(&lport->lp_mutex);
FC_LPORT_DBG(lport, "Received FLOGI request while in state %s\n",
fc_lport_state(lport));
remote_fid = fc_frame_sid(rx_fp);
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 "host%d: libfc: Received FLOGI from port "
"with same WWPN %16.16llx\n",
lport->host->host_no, remote_wwpn);
goto out;
}
FC_LPORT_DBG(lport, "FLOGI from port WWPN %16.16llx\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_lport_set_port_id(lport, local_fid, rx_fp);
fp = fc_frame_alloc(lport, sizeof(*flp));
if (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.
*/
fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
fh = fc_frame_header_get(fp);
hton24(fh->fh_s_id, local_fid);
hton24(fh->fh_d_id, remote_fid);
lport->tt.frame_send(lport, fp);
} else {
fc_lport_error(lport, fp);
}
fc_lport_ptp_setup(lport, remote_fid, remote_wwpn,
get_unaligned_be64(&flp->fl_wwnn));
out:
fc_frame_free(rx_fp);
}
/**
* fc_lport_recv_els_req() - The generic lport ELS request handler
* @lport: The local port that received the request
* @fp: The request frame
*
* 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 because it will grab the lock.
*/
static void fc_lport_recv_els_req(struct fc_lport *lport,
struct fc_frame *fp)
{
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 {
/*
* Check opcode.
*/
switch (fc_frame_payload_op(fp)) {
case ELS_FLOGI:
if (!lport->point_to_multipoint)
fc_lport_recv_flogi_req(lport, fp);
else
fc_rport_recv_req(lport, fp);
break;
case ELS_LOGO:
if (fc_frame_sid(fp) == FC_FID_FLOGI)
fc_lport_recv_logo_req(lport, fp);
else
fc_rport_recv_req(lport, fp);
break;
case ELS_RSCN:
lport->tt.disc_recv_req(lport, fp);
break;
case ELS_ECHO:
fc_lport_recv_echo_req(lport, fp);
break;
case ELS_RLIR:
fc_lport_recv_rlir_req(lport, fp);
break;
case ELS_RNID:
fc_lport_recv_rnid_req(lport, fp);
break;
default:
fc_rport_recv_req(lport, fp);
break;
}
}
mutex_unlock(&lport->lp_mutex);
}
static int fc_lport_els_prli(struct fc_rport_priv *rdata, u32 spp_len,
const struct fc_els_spp *spp_in,
struct fc_els_spp *spp_out)
{
return FC_SPP_RESP_INVL;
}
struct fc4_prov fc_lport_els_prov = {
.prli = fc_lport_els_prli,
.recv = fc_lport_recv_els_req,
};
/**
* fc_lport_recv() - The generic lport request handler
* @lport: The lport that received the request
* @fp: The frame the request is in
*
* Locking Note: This function should not be called with the lport
* lock held because it may grab the lock.
*/
void fc_lport_recv(struct fc_lport *lport, struct fc_frame *fp)
{
struct fc_frame_header *fh = fc_frame_header_get(fp);
struct fc_seq *sp = fr_seq(fp);
struct fc4_prov *prov;
/*
* Use RCU read lock and module_lock to be sure module doesn't
* deregister and get unloaded while we're calling it.
* try_module_get() is inlined and accepts a NULL parameter.
* Only ELSes and FCP target ops should come through here.
* The locking is unfortunate, and a better scheme is being sought.
*/
rcu_read_lock();
if (fh->fh_type >= FC_FC4_PROV_SIZE)
goto drop;
prov = rcu_dereference(fc_passive_prov[fh->fh_type]);
if (!prov || !try_module_get(prov->module))
goto drop;
rcu_read_unlock();
prov->recv(lport, fp);
module_put(prov->module);
return;
drop:
rcu_read_unlock();
FC_LPORT_DBG(lport, "dropping unexpected frame type %x\n", fh->fh_type);
fc_frame_free(fp);
if (sp)
fc_exch_done(sp);
}
EXPORT_SYMBOL(fc_lport_recv);
/**
* fc_lport_reset() - Reset a local port
* @lport: The local port 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 w/ the lport lock held
* @lport: The local port to be reset
*/
static void fc_lport_reset_locked(struct fc_lport *lport)
{
lockdep_assert_held(&lport->lp_mutex);
if (lport->dns_rdata) {
fc_rport_logoff(lport->dns_rdata);
lport->dns_rdata = NULL;
}
if (lport->ptp_rdata) {
fc_rport_logoff(lport->ptp_rdata);
kref_put(&lport->ptp_rdata->kref, fc_rport_destroy);
lport->ptp_rdata = NULL;
}
lport->tt.disc_stop(lport);
lport->tt.exch_mgr_reset(lport, 0, 0);
fc_host_fabric_name(lport->host) = 0;
if (lport->port_id && (!lport->point_to_multipoint || !lport->link_up))
fc_lport_set_port_id(lport, 0, NULL);
}
/**
* fc_lport_enter_reset() - Reset the local port
* @lport: The local port to be reset
*/
static void fc_lport_enter_reset(struct fc_lport *lport)
{
lockdep_assert_held(&lport->lp_mutex);
FC_LPORT_DBG(lport, "Entered RESET state from %s state\n",
fc_lport_state(lport));
if (lport->state == LPORT_ST_DISABLED || lport->state == LPORT_ST_LOGO)
return;
if (lport->vport) {
if (lport->link_up)
fc_vport_set_state(lport->vport, FC_VPORT_INITIALIZING);
else
fc_vport_set_state(lport->vport, FC_VPORT_LINKDOWN);
}
fc_lport_state_enter(lport, LPORT_ST_RESET);
fc_host_post_event(lport->host, fc_get_event_number(),
FCH_EVT_LIPRESET, 0);
fc_vports_linkchange(lport);
fc_lport_reset_locked(lport);
if (lport->link_up)
fc_lport_enter_flogi(lport);
}
/**
* fc_lport_enter_disabled() - Disable the local port
* @lport: The local port to be reset
*/
static void fc_lport_enter_disabled(struct fc_lport *lport)
{
lockdep_assert_held(&lport->lp_mutex);
FC_LPORT_DBG(lport, "Entered disabled state from %s state\n",
fc_lport_state(lport));
fc_lport_state_enter(lport, LPORT_ST_DISABLED);
fc_vports_linkchange(lport);
fc_lport_reset_locked(lport);
}
/**
* fc_lport_error() - Handler for any errors
* @lport: The local port that the error was on
* @fp: The error code encoded in a 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",
IS_ERR(fp) ? -PTR_ERR(fp) : 0, fc_lport_state(lport),
lport->retry_count);
if (PTR_ERR(fp) == -FC_EX_CLOSED)
return;
/*
* Memory allocation failure, or the exchange timed out
* or we received LS_RJT.
* 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
fc_lport_enter_reset(lport);
}
/**
* fc_lport_ns_resp() - Handle response to a name server
* registration exchange
* @sp: current sequence in 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_ns_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 ns %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_RNN_ID || lport->state > LPORT_ST_RFF_ID) {
FC_LPORT_DBG(lport, "Received a name server 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)
switch (lport->state) {
case LPORT_ST_RNN_ID:
fc_lport_enter_ns(lport, LPORT_ST_RSNN_NN);
break;
case LPORT_ST_RSNN_NN:
fc_lport_enter_ns(lport, LPORT_ST_RSPN_ID);
break;
case LPORT_ST_RSPN_ID:
fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
break;
case LPORT_ST_RFT_ID:
fc_lport_enter_ns(lport, LPORT_ST_RFF_ID);
break;
case LPORT_ST_RFF_ID:
if (lport->fdmi_enabled)
fc_lport_enter_fdmi(lport);
else
fc_lport_enter_scr(lport);
break;
default:
/* should have already been caught by state checks */
break;
}
else
fc_lport_error(lport, fp);
out:
fc_frame_free(fp);
err:
mutex_unlock(&lport->lp_mutex);
}
/**
* fc_lport_ms_resp() - Handle response to a management server
* exchange
* @sp: current sequence in 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_ms_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;
struct fc_host_attrs *fc_host = shost_to_fc_host(lport->host);
FC_LPORT_DBG(lport, "Received a ms %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_RHBA || lport->state > LPORT_ST_DPRT) {
FC_LPORT_DBG(lport, "Received a management server 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_MGMT &&
ct->ct_fs_subtype == FC_FDMI_SUBTYPE) {
FC_LPORT_DBG(lport, "Received a management server response, "
"reason=%d explain=%d\n",
ct->ct_reason,
ct->ct_explan);
switch (lport->state) {
case LPORT_ST_RHBA:
if ((ntohs(ct->ct_cmd) == FC_FS_RJT) && fc_host->fdmi_version == FDMI_V2) {
FC_LPORT_DBG(lport, "Error for FDMI-V2, fall back to FDMI-V1\n");
fc_host->fdmi_version = FDMI_V1;
fc_lport_enter_ms(lport, LPORT_ST_RHBA);
} else if (ntohs(ct->ct_cmd) == FC_FS_ACC)
fc_lport_enter_ms(lport, LPORT_ST_RPA);
else /* Error Skip RPA */
fc_lport_enter_scr(lport);
break;
case LPORT_ST_RPA:
fc_lport_enter_scr(lport);
break;
case LPORT_ST_DPRT:
fc_lport_enter_ms(lport, LPORT_ST_RHBA);
break;
case LPORT_ST_DHBA:
fc_lport_enter_ms(lport, LPORT_ST_DPRT);
break;
default:
/* should have already been caught by state checks */
break;
}
} else {
/* Invalid Frame? */
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 SCR (State Change Register) request
* @lport: The local port to register for state changes
*/
static void fc_lport_enter_scr(struct fc_lport *lport)
{
struct fc_frame *fp;
lockdep_assert_held(&lport->lp_mutex);
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,
2 * lport->r_a_tov))
fc_lport_error(lport, NULL);
}
/**
* fc_lport_enter_ns() - register some object with the name server
* @lport: Fibre Channel local port to register
* @state: Local port state
*/
static void fc_lport_enter_ns(struct fc_lport *lport, enum fc_lport_state state)
{
struct fc_frame *fp;
enum fc_ns_req cmd;
int size = sizeof(struct fc_ct_hdr);
size_t len;
lockdep_assert_held(&lport->lp_mutex);
FC_LPORT_DBG(lport, "Entered %s state from %s state\n",
fc_lport_state_names[state],
fc_lport_state(lport));
fc_lport_state_enter(lport, state);
switch (state) {
case LPORT_ST_RNN_ID:
cmd = FC_NS_RNN_ID;
size += sizeof(struct fc_ns_rn_id);
break;
case LPORT_ST_RSNN_NN:
len = strnlen(fc_host_symbolic_name(lport->host), 255);
/* if there is no symbolic name, skip to RFT_ID */
if (!len)
return fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
cmd = FC_NS_RSNN_NN;
size += sizeof(struct fc_ns_rsnn) + len;
break;
case LPORT_ST_RSPN_ID:
len = strnlen(fc_host_symbolic_name(lport->host), 255);
/* if there is no symbolic name, skip to RFT_ID */
if (!len)
return fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
cmd = FC_NS_RSPN_ID;
size += sizeof(struct fc_ns_rspn) + len;
break;
case LPORT_ST_RFT_ID:
cmd = FC_NS_RFT_ID;
size += sizeof(struct fc_ns_rft);
break;
case LPORT_ST_RFF_ID:
cmd = FC_NS_RFF_ID;
size += sizeof(struct fc_ns_rff_id);
break;
default:
fc_lport_error(lport, NULL);
return;
}
fp = fc_frame_alloc(lport, size);
if (!fp) {
fc_lport_error(lport, fp);
return;
}
if (!lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, cmd,
fc_lport_ns_resp,
lport, 3 * lport->r_a_tov))
fc_lport_error(lport, fp);
}
static struct fc_rport_operations fc_lport_rport_ops = {
.event_callback = fc_lport_rport_callback,
};
/**
* fc_lport_enter_dns() - Create a fc_rport for the name server
* @lport: The local port requesting a remote port for the name server
*/
static void fc_lport_enter_dns(struct fc_lport *lport)
{
struct fc_rport_priv *rdata;
lockdep_assert_held(&lport->lp_mutex);
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 = fc_rport_create(lport, FC_FID_DIR_SERV);
mutex_unlock(&lport->disc.disc_mutex);
if (!rdata)
goto err;
rdata->ops = &fc_lport_rport_ops;
fc_rport_login(rdata);
return;
err:
fc_lport_error(lport, NULL);
}
/**
* fc_lport_enter_ms() - management server commands
* @lport: Fibre Channel local port to register
* @state: Local port state
*/
static void fc_lport_enter_ms(struct fc_lport *lport, enum fc_lport_state state)
{
struct fc_frame *fp;
enum fc_fdmi_req cmd;
int size = sizeof(struct fc_ct_hdr);
size_t len;
int numattrs;
struct fc_host_attrs *fc_host = shost_to_fc_host(lport->host);
lockdep_assert_held(&lport->lp_mutex);
FC_LPORT_DBG(lport, "Entered %s state from %s state\n",
fc_lport_state_names[state],
fc_lport_state(lport));
fc_lport_state_enter(lport, state);
switch (state) {
case LPORT_ST_RHBA:
cmd = FC_FDMI_RHBA;
/* Number of HBA Attributes */
numattrs = 11;
len = sizeof(struct fc_fdmi_rhba);
len -= sizeof(struct fc_fdmi_attr_entry);
len += FC_FDMI_HBA_ATTR_NODENAME_LEN;
len += FC_FDMI_HBA_ATTR_MANUFACTURER_LEN;
len += FC_FDMI_HBA_ATTR_SERIALNUMBER_LEN;
len += FC_FDMI_HBA_ATTR_MODEL_LEN;
len += FC_FDMI_HBA_ATTR_MODELDESCR_LEN;
len += FC_FDMI_HBA_ATTR_HARDWAREVERSION_LEN;
len += FC_FDMI_HBA_ATTR_DRIVERVERSION_LEN;
len += FC_FDMI_HBA_ATTR_OPTIONROMVERSION_LEN;
len += FC_FDMI_HBA_ATTR_FIRMWAREVERSION_LEN;
len += FC_FDMI_HBA_ATTR_OSNAMEVERSION_LEN;
len += FC_FDMI_HBA_ATTR_MAXCTPAYLOAD_LEN;
if (fc_host->fdmi_version == FDMI_V2) {
numattrs += 7;
len += FC_FDMI_HBA_ATTR_NODESYMBLNAME_LEN;
len += FC_FDMI_HBA_ATTR_VENDORSPECIFICINFO_LEN;
len += FC_FDMI_HBA_ATTR_NUMBEROFPORTS_LEN;
len += FC_FDMI_HBA_ATTR_FABRICNAME_LEN;
len += FC_FDMI_HBA_ATTR_BIOSVERSION_LEN;
len += FC_FDMI_HBA_ATTR_BIOSSTATE_LEN;
len += FC_FDMI_HBA_ATTR_VENDORIDENTIFIER_LEN;
}
len += (numattrs * FC_FDMI_ATTR_ENTRY_HEADER_LEN);
size += len;
break;
case LPORT_ST_RPA:
cmd = FC_FDMI_RPA;
/* Number of Port Attributes */
numattrs = 6;
len = sizeof(struct fc_fdmi_rpa);
len -= sizeof(struct fc_fdmi_attr_entry);
len += FC_FDMI_PORT_ATTR_FC4TYPES_LEN;
len += FC_FDMI_PORT_ATTR_SUPPORTEDSPEED_LEN;
len += FC_FDMI_PORT_ATTR_CURRENTPORTSPEED_LEN;
len += FC_FDMI_PORT_ATTR_MAXFRAMESIZE_LEN;
len += FC_FDMI_PORT_ATTR_OSDEVICENAME_LEN;
len += FC_FDMI_PORT_ATTR_HOSTNAME_LEN;
if (fc_host->fdmi_version == FDMI_V2) {
numattrs += 10;
len += FC_FDMI_PORT_ATTR_NODENAME_LEN;
len += FC_FDMI_PORT_ATTR_PORTNAME_LEN;
len += FC_FDMI_PORT_ATTR_SYMBOLICNAME_LEN;
len += FC_FDMI_PORT_ATTR_PORTTYPE_LEN;
len += FC_FDMI_PORT_ATTR_SUPPORTEDCLASSSRVC_LEN;
len += FC_FDMI_PORT_ATTR_FABRICNAME_LEN;
len += FC_FDMI_PORT_ATTR_CURRENTFC4TYPE_LEN;
len += FC_FDMI_PORT_ATTR_PORTSTATE_LEN;
len += FC_FDMI_PORT_ATTR_DISCOVEREDPORTS_LEN;
len += FC_FDMI_PORT_ATTR_PORTID_LEN;
}
len += (numattrs * FC_FDMI_ATTR_ENTRY_HEADER_LEN);
size += len;
break;
case LPORT_ST_DPRT:
cmd = FC_FDMI_DPRT;
len = sizeof(struct fc_fdmi_dprt);
size += len;
break;
case LPORT_ST_DHBA:
cmd = FC_FDMI_DHBA;
len = sizeof(struct fc_fdmi_dhba);
size += len;
break;
default:
fc_lport_error(lport, NULL);
return;
}
FC_LPORT_DBG(lport, "Cmd=0x%x Len %d size %d\n",
cmd, (int)len, size);
fp = fc_frame_alloc(lport, size);
if (!fp) {
fc_lport_error(lport, fp);
return;
}
if (!lport->tt.elsct_send(lport, FC_FID_MGMT_SERV, fp, cmd,
fc_lport_ms_resp,
lport, 3 * lport->r_a_tov))
fc_lport_error(lport, fp);
}
/**
* fc_lport_enter_fdmi() - Create a fc_rport for the management server
* @lport: The local port requesting a remote port for the management server
*/
static void fc_lport_enter_fdmi(struct fc_lport *lport)
{
struct fc_rport_priv *rdata;
lockdep_assert_held(&lport->lp_mutex);
FC_LPORT_DBG(lport, "Entered FDMI state from %s state\n",
fc_lport_state(lport));
fc_lport_state_enter(lport, LPORT_ST_FDMI);
mutex_lock(&lport->disc.disc_mutex);
rdata = fc_rport_create(lport, FC_FID_MGMT_SERV);
mutex_unlock(&lport->disc.disc_mutex);
if (!rdata)
goto err;
rdata->ops = &fc_lport_rport_ops;
fc_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 local port
*/
static void fc_lport_timeout(struct work_struct *work)
{
struct fc_lport *lport =
container_of(work, struct fc_lport,
retry_work.work);
struct fc_host_attrs *fc_host = shost_to_fc_host(lport->host);
mutex_lock(&lport->lp_mutex);
switch (lport->state) {
case LPORT_ST_DISABLED:
break;
case LPORT_ST_READY:
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_RNN_ID:
case LPORT_ST_RSNN_NN:
case LPORT_ST_RSPN_ID:
case LPORT_ST_RFT_ID:
case LPORT_ST_RFF_ID:
fc_lport_enter_ns(lport, lport->state);
break;
case LPORT_ST_FDMI:
fc_lport_enter_fdmi(lport);
break;
case LPORT_ST_RHBA:
if (fc_host->fdmi_version == FDMI_V2) {
FC_LPORT_DBG(lport, "timeout for FDMI-V2 RHBA,fall back to FDMI-V1\n");
fc_host->fdmi_version = FDMI_V1;
fc_lport_enter_ms(lport, LPORT_ST_RHBA);
break;
}
fallthrough;
case LPORT_ST_RPA:
case LPORT_ST_DHBA:
case LPORT_ST_DPRT:
FC_LPORT_DBG(lport, "Skipping lport state %s to SCR\n",
fc_lport_state(lport));
fallthrough;
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: The sequence that the LOGO was on
* @fp: The LOGO frame
* @lp_arg: The lport port that received 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.
*/
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);
}
EXPORT_SYMBOL(fc_lport_logo_resp);
/**
* fc_lport_enter_logo() - Logout of the fabric
* @lport: The local port to be logged out
*/
static void fc_lport_enter_logo(struct fc_lport *lport)
{
struct fc_frame *fp;
struct fc_els_logo *logo;
lockdep_assert_held(&lport->lp_mutex);
FC_LPORT_DBG(lport, "Entered LOGO state from %s state\n",
fc_lport_state(lport));
fc_lport_state_enter(lport, LPORT_ST_LOGO);
fc_vports_linkchange(lport);
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,
2 * lport->r_a_tov))
fc_lport_error(lport, NULL);
}
/**
* fc_lport_flogi_resp() - Handle response to FLOGI request
* @sp: The sequence that the FLOGI was on
* @fp: The FLOGI response frame
* @lp_arg: The lport port that received the FLOGI response
*
* 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.
*/
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 = fc_frame_did(fp);
if (fh->fh_r_ctl != FC_RCTL_ELS_REP || did == 0 ||
fc_frame_payload_op(fp) != ELS_LS_ACC) {
FC_LPORT_DBG(lport, "FLOGI not accepted or bad response\n");
fc_lport_error(lport, fp);
goto out;
}
flp = fc_frame_payload_get(fp, sizeof(*flp));
if (!flp) {
FC_LPORT_DBG(lport, "FLOGI bad response\n");
fc_lport_error(lport, fp);
goto out;
}
mfs = ntohs(flp->fl_csp.sp_bb_data) &
FC_SP_BB_DATA_MASK;
if (mfs < FC_SP_MIN_MAX_PAYLOAD || mfs > FC_SP_MAX_MAX_PAYLOAD) {
FC_LPORT_DBG(lport, "FLOGI bad mfs:%hu response, "
"lport->mfs:%u\n", mfs, lport->mfs);
fc_lport_error(lport, fp);
goto out;
}
if (mfs <= lport->mfs) {
lport->mfs = mfs;
fc_host_maxframe_size(lport->host) = 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;
lport->npiv_enabled = !!(csp_flags & FC_SP_FT_NPIV_ACC);
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 * lport->e_d_tov;
fc_lport_set_port_id(lport, did, fp);
printk(KERN_INFO "host%d: libfc: "
"Port (%6.6x) entered "
"point-to-point mode\n",
lport->host->host_no, did);
fc_lport_ptp_setup(lport, fc_frame_sid(fp),
get_unaligned_be64(
&flp->fl_wwpn),
get_unaligned_be64(
&flp->fl_wwnn));
} else {
if (e_d_tov > lport->e_d_tov)
lport->e_d_tov = e_d_tov;
if (r_a_tov > lport->r_a_tov)
lport->r_a_tov = r_a_tov;
fc_host_fabric_name(lport->host) =
get_unaligned_be64(&flp->fl_wwnn);
fc_lport_set_port_id(lport, did, fp);
fc_lport_enter_dns(lport);
}
out:
fc_frame_free(fp);
err:
mutex_unlock(&lport->lp_mutex);
}
EXPORT_SYMBOL(fc_lport_flogi_resp);
/**
* fc_lport_enter_flogi() - Send a FLOGI request to the fabric manager
* @lport: Fibre Channel local port to be logged in to the fabric
*/
static void fc_lport_enter_flogi(struct fc_lport *lport)
{
struct fc_frame *fp;
lockdep_assert_held(&lport->lp_mutex);
FC_LPORT_DBG(lport, "Entered FLOGI state from %s state\n",
fc_lport_state(lport));
fc_lport_state_enter(lport, LPORT_ST_FLOGI);
if (lport->point_to_multipoint) {
if (lport->port_id)
fc_lport_enter_ready(lport);
return;
}
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,
lport->vport ? ELS_FDISC : ELS_FLOGI,
fc_lport_flogi_resp, lport,
lport->vport ? 2 * lport->r_a_tov :
lport->e_d_tov))
fc_lport_error(lport, NULL);
}
/**
* fc_lport_config() - Configure a fc_lport
* @lport: The local port to be configured
*/
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);
fc_fc4_conf_lport_params(lport, FC_TYPE_FCP);
return 0;
}
EXPORT_SYMBOL(fc_lport_config);
/**
* fc_lport_init() - Initialize the lport layer for a local port
* @lport: The local port to initialize the exchange layer for
*/
int fc_lport_init(struct fc_lport *lport)
{
struct fc_host_attrs *fc_host;
fc_host = shost_to_fc_host(lport->host);
/* Set FDMI version to FDMI-2 specification*/
fc_host->fdmi_version = FDMI_V2;
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;
fc_host_num_discovered_ports(lport->host) = 4;
/* 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;
if (lport->link_supported_speeds & FC_PORTSPEED_40GBIT)
fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_40GBIT;
if (lport->link_supported_speeds & FC_PORTSPEED_100GBIT)
fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_100GBIT;
if (lport->link_supported_speeds & FC_PORTSPEED_25GBIT)
fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_25GBIT;
if (lport->link_supported_speeds & FC_PORTSPEED_50GBIT)
fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_50GBIT;
if (lport->link_supported_speeds & FC_PORTSPEED_100GBIT)
fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_100GBIT;
fc_fc4_add_lport(lport);
fc_host_num_discovered_ports(lport->host) = DISCOVERED_PORTS;
fc_host_port_state(lport->host) = FC_PORTSTATE_ONLINE;
fc_host_max_ct_payload(lport->host) = MAX_CT_PAYLOAD;
fc_host_num_ports(lport->host) = NUMBER_OF_PORTS;
fc_host_bootbios_state(lport->host) = 0X00000000;
snprintf(fc_host_bootbios_version(lport->host),
FC_SYMBOLIC_NAME_SIZE, "%s", "Unknown");
return 0;
}
EXPORT_SYMBOL(fc_lport_init);
/**
* fc_lport_bsg_resp() - The common response handler for FC Passthrough requests
* @sp: The sequence for the FC Passthrough response
* @fp: The response frame
* @info_arg: The BSG info that the response is for
*/
static void fc_lport_bsg_resp(struct fc_seq *sp, struct fc_frame *fp,
void *info_arg)
{
struct fc_bsg_info *info = info_arg;
struct bsg_job *job = info->job;
struct fc_bsg_reply *bsg_reply = job->reply;
struct fc_lport *lport = info->lport;
struct fc_frame_header *fh;
size_t len;
void *buf;
if (IS_ERR(fp)) {
bsg_reply->result = (PTR_ERR(fp) == -FC_EX_CLOSED) ?
-ECONNABORTED : -ETIMEDOUT;
job->reply_len = sizeof(uint32_t);
bsg_job_done(job, bsg_reply->result,
bsg_reply->reply_payload_rcv_len);
kfree(info);
return;
}
mutex_lock(&lport->lp_mutex);
fh = fc_frame_header_get(fp);
len = fr_len(fp) - sizeof(*fh);
buf = fc_frame_payload_get(fp, 0);
if (fr_sof(fp) == FC_SOF_I3 && !ntohs(fh->fh_seq_cnt)) {
/* Get the response code from the first frame payload */
unsigned short cmd = (info->rsp_code == FC_FS_ACC) ?
ntohs(((struct fc_ct_hdr *)buf)->ct_cmd) :
(unsigned short)fc_frame_payload_op(fp);
/* Save the reply status of the job */
bsg_reply->reply_data.ctels_reply.status =
(cmd == info->rsp_code) ?
FC_CTELS_STATUS_OK : FC_CTELS_STATUS_REJECT;
}
bsg_reply->reply_payload_rcv_len +=
fc_copy_buffer_to_sglist(buf, len, info->sg, &info->nents,
&info->offset, NULL);
if (fr_eof(fp) == FC_EOF_T &&
(ntoh24(fh->fh_f_ctl) & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) ==
(FC_FC_LAST_SEQ | FC_FC_END_SEQ)) {
if (bsg_reply->reply_payload_rcv_len >
job->reply_payload.payload_len)
bsg_reply->reply_payload_rcv_len =
job->reply_payload.payload_len;
bsg_reply->result = 0;
bsg_job_done(job, bsg_reply->result,
bsg_reply->reply_payload_rcv_len);
kfree(info);
}
fc_frame_free(fp);
mutex_unlock(&lport->lp_mutex);
}
/**
* fc_lport_els_request() - Send ELS passthrough request
* @job: The BSG Passthrough job
* @lport: The local port sending the request
* @did: The destination port id
* @tov: The timeout period (in ms)
*/
static int fc_lport_els_request(struct bsg_job *job,
struct fc_lport *lport,
u32 did, u32 tov)
{
struct fc_bsg_info *info;
struct fc_frame *fp;
struct fc_frame_header *fh;
char *pp;
int len;
lockdep_assert_held(&lport->lp_mutex);
fp = fc_frame_alloc(lport, job->request_payload.payload_len);
if (!fp)
return -ENOMEM;
len = job->request_payload.payload_len;
pp = fc_frame_payload_get(fp, len);
sg_copy_to_buffer(job->request_payload.sg_list,
job->request_payload.sg_cnt,
pp, len);
fh = fc_frame_header_get(fp);
fh->fh_r_ctl = FC_RCTL_ELS_REQ;
hton24(fh->fh_d_id, did);
hton24(fh->fh_s_id, lport->port_id);
fh->fh_type = FC_TYPE_ELS;
hton24(fh->fh_f_ctl, FC_FCTL_REQ);
fh->fh_cs_ctl = 0;
fh->fh_df_ctl = 0;
fh->fh_parm_offset = 0;
info = kzalloc(sizeof(struct fc_bsg_info), GFP_KERNEL);
if (!info) {
fc_frame_free(fp);
return -ENOMEM;
}
info->job = job;
info->lport = lport;
info->rsp_code = ELS_LS_ACC;
info->nents = job->reply_payload.sg_cnt;
info->sg = job->reply_payload.sg_list;
if (!fc_exch_seq_send(lport, fp, fc_lport_bsg_resp,
NULL, info, tov)) {
kfree(info);
return -ECOMM;
}
return 0;
}
/**
* fc_lport_ct_request() - Send CT Passthrough request
* @job: The BSG Passthrough job
* @lport: The local port sending the request
* @did: The destination FC-ID
* @tov: The timeout period to wait for the response
*/
static int fc_lport_ct_request(struct bsg_job *job,
struct fc_lport *lport, u32 did, u32 tov)
{
struct fc_bsg_info *info;
struct fc_frame *fp;
struct fc_frame_header *fh;
struct fc_ct_req *ct;
size_t len;
lockdep_assert_held(&lport->lp_mutex);
fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
job->request_payload.payload_len);
if (!fp)
return -ENOMEM;
len = job->request_payload.payload_len;
ct = fc_frame_payload_get(fp, len);
sg_copy_to_buffer(job->request_payload.sg_list,
job->request_payload.sg_cnt,
ct, len);
fh = fc_frame_header_get(fp);
fh->fh_r_ctl = FC_RCTL_DD_UNSOL_CTL;
hton24(fh->fh_d_id, did);
hton24(fh->fh_s_id, lport->port_id);
fh->fh_type = FC_TYPE_CT;
hton24(fh->fh_f_ctl, FC_FCTL_REQ);
fh->fh_cs_ctl = 0;
fh->fh_df_ctl = 0;
fh->fh_parm_offset = 0;
info = kzalloc(sizeof(struct fc_bsg_info), GFP_KERNEL);
if (!info) {
fc_frame_free(fp);
return -ENOMEM;
}
info->job = job;
info->lport = lport;
info->rsp_code = FC_FS_ACC;
info->nents = job->reply_payload.sg_cnt;
info->sg = job->reply_payload.sg_list;
if (!fc_exch_seq_send(lport, fp, fc_lport_bsg_resp,
NULL, info, tov)) {
kfree(info);
return -ECOMM;
}
return 0;
}
/**
* fc_lport_bsg_request() - The common entry point for sending
* FC Passthrough requests
* @job: The BSG passthrough job
*/
int fc_lport_bsg_request(struct bsg_job *job)
{
struct fc_bsg_request *bsg_request = job->request;
struct fc_bsg_reply *bsg_reply = job->reply;
struct Scsi_Host *shost = fc_bsg_to_shost(job);
struct fc_lport *lport = shost_priv(shost);
struct fc_rport *rport;
struct fc_rport_priv *rdata;
int rc = -EINVAL;
u32 did, tov;
bsg_reply->reply_payload_rcv_len = 0;
mutex_lock(&lport->lp_mutex);
switch (bsg_request->msgcode) {
case FC_BSG_RPT_ELS:
rport = fc_bsg_to_rport(job);
if (!rport)
break;
rdata = rport->dd_data;
rc = fc_lport_els_request(job, lport, rport->port_id,
rdata->e_d_tov);
break;
case FC_BSG_RPT_CT:
rport = fc_bsg_to_rport(job);
if (!rport)
break;
rdata = rport->dd_data;
rc = fc_lport_ct_request(job, lport, rport->port_id,
rdata->e_d_tov);
break;
case FC_BSG_HST_CT:
did = ntoh24(bsg_request->rqst_data.h_ct.port_id);
if (did == FC_FID_DIR_SERV) {
rdata = lport->dns_rdata;
if (!rdata)
break;
tov = rdata->e_d_tov;
} else {
rdata = fc_rport_lookup(lport, did);
if (!rdata)
break;
tov = rdata->e_d_tov;
kref_put(&rdata->kref, fc_rport_destroy);
}
rc = fc_lport_ct_request(job, lport, did, tov);
break;
case FC_BSG_HST_ELS_NOLOGIN:
did = ntoh24(bsg_request->rqst_data.h_els.port_id);
rc = fc_lport_els_request(job, lport, did, lport->e_d_tov);
break;
}
mutex_unlock(&lport->lp_mutex);
return rc;
}
EXPORT_SYMBOL(fc_lport_bsg_request);
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