2195 lines
58 KiB
C
2195 lines
58 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright(c) 2007 Intel Corporation. All rights reserved.
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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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* HIERARCHY
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*
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* The following hierarchy 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 hierarchy-
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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 because 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, successful 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 <linux/delay.h>
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#include <linux/module.h>
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#include <linux/slab.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 <linux/scatterlist.h>
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#include "fc_encode.h"
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#include "fc_libfc.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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#define MAX_CT_PAYLOAD 2048
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#define DISCOVERED_PORTS 4
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#define NUMBER_OF_PORTS 1
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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_ns(struct fc_lport *, enum fc_lport_state);
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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 void fc_lport_enter_fdmi(struct fc_lport *lport);
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static void fc_lport_enter_ms(struct fc_lport *, enum fc_lport_state);
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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_RNN_ID] = "RNN_ID",
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[LPORT_ST_RSNN_NN] = "RSNN_NN",
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[LPORT_ST_RSPN_ID] = "RSPN_ID",
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[LPORT_ST_RFT_ID] = "RFT_ID",
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[LPORT_ST_RFF_ID] = "RFF_ID",
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[LPORT_ST_FDMI] = "FDMI",
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[LPORT_ST_RHBA] = "RHBA",
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[LPORT_ST_RPA] = "RPA",
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[LPORT_ST_DHBA] = "DHBA",
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[LPORT_ST_DPRT] = "DPRT",
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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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/**
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* struct fc_bsg_info - FC Passthrough managemet structure
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* @job: The passthrough job
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* @lport: The local port to pass through a command
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* @rsp_code: The expected response code
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* @sg: job->reply_payload.sg_list
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* @nents: job->reply_payload.sg_cnt
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* @offset: The offset into the response data
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*/
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struct fc_bsg_info {
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struct bsg_job *job;
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struct fc_lport *lport;
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u16 rsp_code;
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struct scatterlist *sg;
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u32 nents;
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size_t offset;
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};
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/**
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* fc_frame_drop() - Dummy frame handler
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* @lport: The local port the frame was received on
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* @fp: The received frame
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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 occurred
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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 (%6.6x)\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_rdata = rdata;
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fc_lport_enter_ns(lport, LPORT_ST_RNN_ID);
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} else if (lport->state == LPORT_ST_FDMI) {
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lport->ms_rdata = rdata;
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fc_lport_enter_ms(lport, LPORT_ST_DHBA);
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} else {
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FC_LPORT_DBG(lport, "Received an READY event "
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"on port (%6.6x) for the directory "
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"server, but the lport is not "
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"in the DNS or FDMI 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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fc_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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if (rdata->ids.port_id == FC_FID_DIR_SERV)
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lport->dns_rdata = NULL;
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else if (rdata->ids.port_id == FC_FID_MGMT_SERV)
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lport->ms_rdata = 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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* @remote_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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lockdep_assert_held(&lport->lp_mutex);
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if (lport->ptp_rdata) {
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fc_rport_logoff(lport->ptp_rdata);
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kref_put(&lport->ptp_rdata->kref, fc_rport_destroy);
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}
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mutex_lock(&lport->disc.disc_mutex);
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lport->ptp_rdata = fc_rport_create(lport, remote_fid);
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kref_get(&lport->ptp_rdata->kref);
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lport->ptp_rdata->ids.port_name = remote_wwpn;
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lport->ptp_rdata->ids.node_name = remote_wwnn;
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mutex_unlock(&lport->disc.disc_mutex);
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fc_rport_login(lport->ptp_rdata);
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fc_lport_enter_ready(lport);
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}
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/**
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* fc_get_host_port_state() - Return the port state of the given Scsi_Host
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* @shost: The SCSI host whose port state is to be determined
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*/
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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 *lport = shost_priv(shost);
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mutex_lock(&lport->lp_mutex);
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if (!lport->link_up)
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fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
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else
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switch (lport->state) {
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case LPORT_ST_READY:
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fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
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break;
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default:
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fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
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}
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mutex_unlock(&lport->lp_mutex);
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}
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EXPORT_SYMBOL(fc_get_host_port_state);
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/**
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* fc_get_host_speed() - Return the speed of the given Scsi_Host
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* @shost: The SCSI host whose port speed is to be determined
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*/
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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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/**
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* fc_get_host_stats() - Return the Scsi_Host's statistics
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* @shost: The SCSI host whose statistics are to be returned
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*/
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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 *fc_stats;
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struct fc_lport *lport = shost_priv(shost);
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unsigned int cpu;
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u64 fcp_in_bytes = 0;
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u64 fcp_out_bytes = 0;
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fc_stats = &lport->host_stats;
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memset(fc_stats, 0, sizeof(struct fc_host_statistics));
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fc_stats->seconds_since_last_reset = (jiffies - lport->boot_time) / HZ;
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for_each_possible_cpu(cpu) {
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struct fc_stats *stats;
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stats = per_cpu_ptr(lport->stats, cpu);
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fc_stats->tx_frames += READ_ONCE(stats->TxFrames);
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fc_stats->tx_words += READ_ONCE(stats->TxWords);
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fc_stats->rx_frames += READ_ONCE(stats->RxFrames);
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fc_stats->rx_words += READ_ONCE(stats->RxWords);
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fc_stats->error_frames += READ_ONCE(stats->ErrorFrames);
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fc_stats->invalid_crc_count += READ_ONCE(stats->InvalidCRCCount);
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fc_stats->fcp_input_requests += READ_ONCE(stats->InputRequests);
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fc_stats->fcp_output_requests += READ_ONCE(stats->OutputRequests);
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fc_stats->fcp_control_requests += READ_ONCE(stats->ControlRequests);
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fcp_in_bytes += READ_ONCE(stats->InputBytes);
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fcp_out_bytes += READ_ONCE(stats->OutputBytes);
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fc_stats->fcp_packet_alloc_failures += READ_ONCE(stats->FcpPktAllocFails);
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fc_stats->fcp_packet_aborts += READ_ONCE(stats->FcpPktAborts);
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fc_stats->fcp_frame_alloc_failures += READ_ONCE(stats->FcpFrameAllocFails);
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fc_stats->link_failure_count += READ_ONCE(stats->LinkFailureCount);
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}
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fc_stats->fcp_input_megabytes = div_u64(fcp_in_bytes, 1000000);
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fc_stats->fcp_output_megabytes = div_u64(fcp_out_bytes, 1000000);
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fc_stats->lip_count = -1;
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fc_stats->nos_count = -1;
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fc_stats->loss_of_sync_count = -1;
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fc_stats->loss_of_signal_count = -1;
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fc_stats->prim_seq_protocol_err_count = -1;
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fc_stats->dumped_frames = -1;
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/* update exches stats */
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fc_exch_update_stats(lport);
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return fc_stats;
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||
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}
|
||
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EXPORT_SYMBOL(fc_get_host_stats);
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||
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|
||
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/**
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* fc_lport_flogi_fill() - Fill in FLOGI command for request
|
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* @lport: The local port the FLOGI is for
|
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* @flogi: The FLOGI command
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* @op: The opcode
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*/
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||
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static void fc_lport_flogi_fill(struct fc_lport *lport,
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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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||
|
|
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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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||
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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;
|
||
|
}
|
||
|
|
||
|
|