forked from Minki/linux
22655ac222
It's possible and harmless to get FLOGI timeouts while in RESET state. Don't do a WARN_ON in that case. Also, split out the other WARN_ONs in fc_lport_timeout, so we can tell which one is hit by its line number. Signed-off-by: Joe Eykholt <jeykholt@cisco.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
1510 lines
40 KiB
C
1510 lines
40 KiB
C
/*
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* Copyright(c) 2007 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Maintained at www.Open-FCoE.org
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*/
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/*
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* PORT LOCKING NOTES
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*
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* These comments only apply to the 'port code' which consists of the lport,
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* disc and rport blocks.
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*
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* MOTIVATION
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*
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* The lport, disc and rport blocks all have mutexes that are used to protect
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* those objects. The main motivation for these locks is to prevent from
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* having an lport reset just before we send a frame. In that scenario the
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* lport's FID would get set to zero and then we'd send a frame with an
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* invalid SID. We also need to ensure that states don't change unexpectedly
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* while processing another state.
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*
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* HEIRARCHY
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*
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* The following heirarchy defines the locking rules. A greater lock
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* may be held before acquiring a lesser lock, but a lesser lock should never
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* be held while attempting to acquire a greater lock. Here is the heirarchy-
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*
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* lport > disc, lport > rport, disc > rport
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*
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* CALLBACKS
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*
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* The callbacks cause complications with this scheme. There is a callback
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* from the rport (to either lport or disc) and a callback from disc
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* (to the lport).
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*
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* As rports exit the rport state machine a callback is made to the owner of
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* the rport to notify success or failure. Since the callback is likely to
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* cause the lport or disc to grab its lock we cannot hold the rport lock
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* while making the callback. To ensure that the rport is not free'd while
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* processing the callback the rport callbacks are serialized through a
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* single-threaded workqueue. An rport would never be free'd while in a
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* callback handler becuase no other rport work in this queue can be executed
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* at the same time.
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*
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* When discovery succeeds or fails a callback is made to the lport as
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* notification. Currently, succesful discovery causes the lport to take no
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* action. A failure will cause the lport to reset. There is likely a circular
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* locking problem with this implementation.
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*/
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/*
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* LPORT LOCKING
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*
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* The critical sections protected by the lport's mutex are quite broad and
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* may be improved upon in the future. The lport code and its locking doesn't
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* influence the I/O path, so excessive locking doesn't penalize I/O
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* performance.
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*
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* The strategy is to lock whenever processing a request or response. Note
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* that every _enter_* function corresponds to a state change. They generally
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* change the lports state and then send a request out on the wire. We lock
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* before calling any of these functions to protect that state change. This
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* means that the entry points into the lport block manage the locks while
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* the state machine can transition between states (i.e. _enter_* functions)
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* while always staying protected.
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*
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* When handling responses we also hold the lport mutex broadly. When the
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* lport receives the response frame it locks the mutex and then calls the
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* appropriate handler for the particuar response. Generally a response will
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* trigger a state change and so the lock must already be held.
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*
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* Retries also have to consider the locking. The retries occur from a work
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* context and the work function will lock the lport and then retry the state
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* (i.e. _enter_* function).
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*/
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#include <linux/timer.h>
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#include <asm/unaligned.h>
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#include <scsi/fc/fc_gs.h>
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#include <scsi/libfc.h>
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#include <scsi/fc_encode.h>
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/* Fabric IDs to use for point-to-point mode, chosen on whims. */
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#define FC_LOCAL_PTP_FID_LO 0x010101
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#define FC_LOCAL_PTP_FID_HI 0x010102
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#define DNS_DELAY 3 /* Discovery delay after RSCN (in seconds)*/
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static void fc_lport_error(struct fc_lport *, struct fc_frame *);
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static void fc_lport_enter_reset(struct fc_lport *);
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static void fc_lport_enter_flogi(struct fc_lport *);
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static void fc_lport_enter_dns(struct fc_lport *);
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static void fc_lport_enter_rpn_id(struct fc_lport *);
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static void fc_lport_enter_rft_id(struct fc_lport *);
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static void fc_lport_enter_scr(struct fc_lport *);
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static void fc_lport_enter_ready(struct fc_lport *);
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static void fc_lport_enter_logo(struct fc_lport *);
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static const char *fc_lport_state_names[] = {
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[LPORT_ST_DISABLED] = "disabled",
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[LPORT_ST_FLOGI] = "FLOGI",
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[LPORT_ST_DNS] = "dNS",
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[LPORT_ST_RPN_ID] = "RPN_ID",
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[LPORT_ST_RFT_ID] = "RFT_ID",
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[LPORT_ST_SCR] = "SCR",
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[LPORT_ST_READY] = "Ready",
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[LPORT_ST_LOGO] = "LOGO",
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[LPORT_ST_RESET] = "reset",
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};
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static int fc_frame_drop(struct fc_lport *lport, struct fc_frame *fp)
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{
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fc_frame_free(fp);
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return 0;
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}
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/**
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* fc_lport_rport_callback() - Event handler for rport events
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* @lport: The lport which is receiving the event
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* @rdata: private remote port data
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* @event: The event that occured
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*
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* Locking Note: The rport lock should not be held when calling
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* this function.
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*/
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static void fc_lport_rport_callback(struct fc_lport *lport,
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struct fc_rport_priv *rdata,
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enum fc_rport_event event)
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{
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FC_LPORT_DBG(lport, "Received a %d event for port (%6x)\n", event,
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rdata->ids.port_id);
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mutex_lock(&lport->lp_mutex);
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switch (event) {
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case RPORT_EV_READY:
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if (lport->state == LPORT_ST_DNS) {
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lport->dns_rp = rdata;
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fc_lport_enter_rpn_id(lport);
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} else {
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FC_LPORT_DBG(lport, "Received an READY event "
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"on port (%6x) for the directory "
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"server, but the lport is not "
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"in the DNS state, it's in the "
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"%d state", rdata->ids.port_id,
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lport->state);
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lport->tt.rport_logoff(rdata);
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}
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break;
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case RPORT_EV_LOGO:
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case RPORT_EV_FAILED:
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case RPORT_EV_STOP:
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lport->dns_rp = NULL;
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break;
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case RPORT_EV_NONE:
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break;
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}
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mutex_unlock(&lport->lp_mutex);
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}
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/**
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* fc_lport_state() - Return a string which represents the lport's state
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* @lport: The lport whose state is to converted to a string
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*/
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static const char *fc_lport_state(struct fc_lport *lport)
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{
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const char *cp;
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cp = fc_lport_state_names[lport->state];
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if (!cp)
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cp = "unknown";
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return cp;
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}
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/**
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* fc_lport_ptp_setup() - Create an rport for point-to-point mode
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* @lport: The lport to attach the ptp rport to
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* @fid: The FID of the ptp rport
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* @remote_wwpn: The WWPN of the ptp rport
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* @remote_wwnn: The WWNN of the ptp rport
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*/
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static void fc_lport_ptp_setup(struct fc_lport *lport,
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u32 remote_fid, u64 remote_wwpn,
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u64 remote_wwnn)
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{
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mutex_lock(&lport->disc.disc_mutex);
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if (lport->ptp_rp)
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lport->tt.rport_logoff(lport->ptp_rp);
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lport->ptp_rp = lport->tt.rport_create(lport, remote_fid);
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lport->ptp_rp->ids.port_name = remote_wwpn;
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lport->ptp_rp->ids.node_name = remote_wwnn;
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mutex_unlock(&lport->disc.disc_mutex);
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lport->tt.rport_login(lport->ptp_rp);
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fc_lport_enter_ready(lport);
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}
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void fc_get_host_port_type(struct Scsi_Host *shost)
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{
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/* TODO - currently just NPORT */
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fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
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}
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EXPORT_SYMBOL(fc_get_host_port_type);
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void fc_get_host_port_state(struct Scsi_Host *shost)
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{
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struct fc_lport *lp = shost_priv(shost);
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if (lp->link_up)
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fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
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else
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fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
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}
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EXPORT_SYMBOL(fc_get_host_port_state);
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void fc_get_host_speed(struct Scsi_Host *shost)
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{
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struct fc_lport *lport = shost_priv(shost);
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fc_host_speed(shost) = lport->link_speed;
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}
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EXPORT_SYMBOL(fc_get_host_speed);
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struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost)
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{
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struct fc_host_statistics *fcoe_stats;
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struct fc_lport *lp = shost_priv(shost);
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struct timespec v0, v1;
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unsigned int cpu;
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fcoe_stats = &lp->host_stats;
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memset(fcoe_stats, 0, sizeof(struct fc_host_statistics));
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jiffies_to_timespec(jiffies, &v0);
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jiffies_to_timespec(lp->boot_time, &v1);
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fcoe_stats->seconds_since_last_reset = (v0.tv_sec - v1.tv_sec);
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for_each_possible_cpu(cpu) {
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struct fcoe_dev_stats *stats;
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stats = per_cpu_ptr(lp->dev_stats, cpu);
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fcoe_stats->tx_frames += stats->TxFrames;
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fcoe_stats->tx_words += stats->TxWords;
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fcoe_stats->rx_frames += stats->RxFrames;
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fcoe_stats->rx_words += stats->RxWords;
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fcoe_stats->error_frames += stats->ErrorFrames;
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fcoe_stats->invalid_crc_count += stats->InvalidCRCCount;
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fcoe_stats->fcp_input_requests += stats->InputRequests;
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fcoe_stats->fcp_output_requests += stats->OutputRequests;
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fcoe_stats->fcp_control_requests += stats->ControlRequests;
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fcoe_stats->fcp_input_megabytes += stats->InputMegabytes;
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fcoe_stats->fcp_output_megabytes += stats->OutputMegabytes;
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fcoe_stats->link_failure_count += stats->LinkFailureCount;
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}
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fcoe_stats->lip_count = -1;
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fcoe_stats->nos_count = -1;
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fcoe_stats->loss_of_sync_count = -1;
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fcoe_stats->loss_of_signal_count = -1;
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fcoe_stats->prim_seq_protocol_err_count = -1;
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fcoe_stats->dumped_frames = -1;
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return fcoe_stats;
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}
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EXPORT_SYMBOL(fc_get_host_stats);
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/*
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* Fill in FLOGI command for request.
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*/
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static void
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fc_lport_flogi_fill(struct fc_lport *lport, struct fc_els_flogi *flogi,
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unsigned int op)
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{
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struct fc_els_csp *sp;
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struct fc_els_cssp *cp;
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memset(flogi, 0, sizeof(*flogi));
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flogi->fl_cmd = (u8) op;
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put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn);
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put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn);
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sp = &flogi->fl_csp;
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sp->sp_hi_ver = 0x20;
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sp->sp_lo_ver = 0x20;
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sp->sp_bb_cred = htons(10); /* this gets set by gateway */
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sp->sp_bb_data = htons((u16) lport->mfs);
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cp = &flogi->fl_cssp[3 - 1]; /* class 3 parameters */
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cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
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if (op != ELS_FLOGI) {
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sp->sp_features = htons(FC_SP_FT_CIRO);
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sp->sp_tot_seq = htons(255); /* seq. we accept */
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sp->sp_rel_off = htons(0x1f);
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sp->sp_e_d_tov = htonl(lport->e_d_tov);
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cp->cp_rdfs = htons((u16) lport->mfs);
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cp->cp_con_seq = htons(255);
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cp->cp_open_seq = 1;
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}
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}
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/*
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* Add a supported FC-4 type.
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*/
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static void fc_lport_add_fc4_type(struct fc_lport *lport, enum fc_fh_type type)
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{
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__be32 *mp;
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mp = &lport->fcts.ff_type_map[type / FC_NS_BPW];
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*mp = htonl(ntohl(*mp) | 1UL << (type % FC_NS_BPW));
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}
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/**
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* fc_lport_recv_rlir_req() - Handle received Registered Link Incident Report.
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* @lport: Fibre Channel local port recieving the RLIR
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* @sp: current sequence in the RLIR exchange
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* @fp: RLIR request frame
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*
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* Locking Note: The lport lock is expected to be held before calling
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* this function.
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*/
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static void fc_lport_recv_rlir_req(struct fc_seq *sp, struct fc_frame *fp,
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struct fc_lport *lport)
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{
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FC_LPORT_DBG(lport, "Received RLIR request while in state %s\n",
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fc_lport_state(lport));
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lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
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fc_frame_free(fp);
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}
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/**
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* fc_lport_recv_echo_req() - Handle received ECHO request
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* @lport: Fibre Channel local port recieving the ECHO
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* @sp: current sequence in the ECHO exchange
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* @fp: ECHO request frame
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*
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* Locking Note: The lport lock is expected to be held before calling
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* this function.
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*/
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static void fc_lport_recv_echo_req(struct fc_seq *sp, struct fc_frame *in_fp,
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struct fc_lport *lport)
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{
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struct fc_frame *fp;
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struct fc_exch *ep = fc_seq_exch(sp);
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unsigned int len;
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void *pp;
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void *dp;
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u32 f_ctl;
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FC_LPORT_DBG(lport, "Received ECHO request while in state %s\n",
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fc_lport_state(lport));
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len = fr_len(in_fp) - sizeof(struct fc_frame_header);
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pp = fc_frame_payload_get(in_fp, len);
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if (len < sizeof(__be32))
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len = sizeof(__be32);
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fp = fc_frame_alloc(lport, len);
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if (fp) {
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dp = fc_frame_payload_get(fp, len);
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memcpy(dp, pp, len);
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*((__be32 *)dp) = htonl(ELS_LS_ACC << 24);
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sp = lport->tt.seq_start_next(sp);
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f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ;
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fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
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FC_TYPE_ELS, f_ctl, 0);
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lport->tt.seq_send(lport, sp, fp);
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}
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fc_frame_free(in_fp);
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}
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/**
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* fc_lport_recv_rnid_req() - Handle received Request Node ID data request
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* @sp: The sequence in the RNID exchange
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* @fp: The RNID request frame
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* @lport: The local port recieving the RNID
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*
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* Locking Note: The lport lock is expected to be held before calling
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* this function.
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*/
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static void fc_lport_recv_rnid_req(struct fc_seq *sp, struct fc_frame *in_fp,
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struct fc_lport *lport)
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{
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struct fc_frame *fp;
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struct fc_exch *ep = fc_seq_exch(sp);
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struct fc_els_rnid *req;
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struct {
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struct fc_els_rnid_resp rnid;
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struct fc_els_rnid_cid cid;
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struct fc_els_rnid_gen gen;
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} *rp;
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struct fc_seq_els_data rjt_data;
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u8 fmt;
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size_t len;
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u32 f_ctl;
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FC_LPORT_DBG(lport, "Received RNID request while in state %s\n",
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fc_lport_state(lport));
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req = fc_frame_payload_get(in_fp, sizeof(*req));
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if (!req) {
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rjt_data.fp = NULL;
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rjt_data.reason = ELS_RJT_LOGIC;
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rjt_data.explan = ELS_EXPL_NONE;
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lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
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} else {
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fmt = req->rnid_fmt;
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len = sizeof(*rp);
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if (fmt != ELS_RNIDF_GEN ||
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ntohl(lport->rnid_gen.rnid_atype) == 0) {
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fmt = ELS_RNIDF_NONE; /* nothing to provide */
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len -= sizeof(rp->gen);
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}
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fp = fc_frame_alloc(lport, len);
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if (fp) {
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rp = fc_frame_payload_get(fp, len);
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memset(rp, 0, len);
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rp->rnid.rnid_cmd = ELS_LS_ACC;
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rp->rnid.rnid_fmt = fmt;
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rp->rnid.rnid_cid_len = sizeof(rp->cid);
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rp->cid.rnid_wwpn = htonll(lport->wwpn);
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rp->cid.rnid_wwnn = htonll(lport->wwnn);
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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, fp);
|
|
}
|
|
|
|
/**
|
|
* 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, fp);
|
|
}
|
|
|
|
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, fp);
|
|
}
|
|
|
|
/**
|
|
* 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, fp);
|
|
}
|
|
|
|
/* 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);
|