diff options
Diffstat (limited to 'drivers/scsi/libfc/fc_rport.c')
| -rw-r--r-- | drivers/scsi/libfc/fc_rport.c | 2069 |
1 files changed, 2069 insertions, 0 deletions
diff --git a/drivers/scsi/libfc/fc_rport.c b/drivers/scsi/libfc/fc_rport.c new file mode 100644 index 000000000..589ff9aed --- /dev/null +++ b/drivers/scsi/libfc/fc_rport.c @@ -0,0 +1,2069 @@ +/* + * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * Maintained at www.Open-FCoE.org + */ + +/* + * RPORT GENERAL INFO + * + * This file contains all processing regarding fc_rports. It contains the + * rport state machine and does all rport interaction with the transport class. + * There should be no other places in libfc that interact directly with the + * transport class in regards to adding and deleting rports. + * + * fc_rport's represent N_Port's within the fabric. + */ + +/* + * RPORT LOCKING + * + * The rport should never hold the rport mutex and then attempt to acquire + * either the lport or disc mutexes. The rport's mutex is considered lesser + * than both the lport's mutex and the disc mutex. Refer to fc_lport.c for + * more comments on the hierarchy. + * + * The locking strategy is similar to the lport's strategy. The lock protects + * the rport's states and is held and released by the entry points to the rport + * block. All _enter_* functions correspond to rport states and expect the rport + * mutex to be locked before calling them. This means that rports only handle + * one request or response at a time, since they're not critical for the I/O + * path this potential over-use of the mutex is acceptable. + */ + +#include <linux/kernel.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/slab.h> +#include <linux/rcupdate.h> +#include <linux/timer.h> +#include <linux/workqueue.h> +#include <linux/export.h> +#include <asm/unaligned.h> + +#include <scsi/libfc.h> +#include <scsi/fc_encode.h> + +#include "fc_libfc.h" + +static struct workqueue_struct *rport_event_queue; + +static void fc_rport_enter_flogi(struct fc_rport_priv *); +static void fc_rport_enter_plogi(struct fc_rport_priv *); +static void fc_rport_enter_prli(struct fc_rport_priv *); +static void fc_rport_enter_rtv(struct fc_rport_priv *); +static void fc_rport_enter_ready(struct fc_rport_priv *); +static void fc_rport_enter_logo(struct fc_rport_priv *); +static void fc_rport_enter_adisc(struct fc_rport_priv *); + +static void fc_rport_recv_plogi_req(struct fc_lport *, struct fc_frame *); +static void fc_rport_recv_prli_req(struct fc_rport_priv *, struct fc_frame *); +static void fc_rport_recv_prlo_req(struct fc_rport_priv *, struct fc_frame *); +static void fc_rport_recv_logo_req(struct fc_lport *, struct fc_frame *); +static void fc_rport_timeout(struct work_struct *); +static void fc_rport_error(struct fc_rport_priv *, struct fc_frame *); +static void fc_rport_error_retry(struct fc_rport_priv *, struct fc_frame *); +static void fc_rport_work(struct work_struct *); + +static const char *fc_rport_state_names[] = { + [RPORT_ST_INIT] = "Init", + [RPORT_ST_FLOGI] = "FLOGI", + [RPORT_ST_PLOGI_WAIT] = "PLOGI_WAIT", + [RPORT_ST_PLOGI] = "PLOGI", + [RPORT_ST_PRLI] = "PRLI", + [RPORT_ST_RTV] = "RTV", + [RPORT_ST_READY] = "Ready", + [RPORT_ST_ADISC] = "ADISC", + [RPORT_ST_DELETE] = "Delete", +}; + +/** + * fc_rport_lookup() - Lookup a remote port by port_id + * @lport: The local port to lookup the remote port on + * @port_id: The remote port ID to look up + * + * The caller must hold either disc_mutex or rcu_read_lock(). + */ +static struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport, + u32 port_id) +{ + struct fc_rport_priv *rdata; + + list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) + if (rdata->ids.port_id == port_id) + return rdata; + return NULL; +} + +/** + * fc_rport_create() - Create a new remote port + * @lport: The local port this remote port will be associated with + * @ids: The identifiers for the new remote port + * + * The remote port will start in the INIT state. + * + * Locking note: must be called with the disc_mutex held. + */ +static struct fc_rport_priv *fc_rport_create(struct fc_lport *lport, + u32 port_id) +{ + struct fc_rport_priv *rdata; + + rdata = lport->tt.rport_lookup(lport, port_id); + if (rdata) + return rdata; + + rdata = kzalloc(sizeof(*rdata) + lport->rport_priv_size, GFP_KERNEL); + if (!rdata) + return NULL; + + rdata->ids.node_name = -1; + rdata->ids.port_name = -1; + rdata->ids.port_id = port_id; + rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; + + kref_init(&rdata->kref); + mutex_init(&rdata->rp_mutex); + rdata->local_port = lport; + rdata->rp_state = RPORT_ST_INIT; + rdata->event = RPORT_EV_NONE; + rdata->flags = FC_RP_FLAGS_REC_SUPPORTED; + rdata->e_d_tov = lport->e_d_tov; + rdata->r_a_tov = lport->r_a_tov; + rdata->maxframe_size = FC_MIN_MAX_PAYLOAD; + INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout); + INIT_WORK(&rdata->event_work, fc_rport_work); + if (port_id != FC_FID_DIR_SERV) { + rdata->lld_event_callback = lport->tt.rport_event_callback; + list_add_rcu(&rdata->peers, &lport->disc.rports); + } + return rdata; +} + +/** + * fc_rport_destroy() - Free a remote port after last reference is released + * @kref: The remote port's kref + */ +static void fc_rport_destroy(struct kref *kref) +{ + struct fc_rport_priv *rdata; + + rdata = container_of(kref, struct fc_rport_priv, kref); + kfree_rcu(rdata, rcu); +} + +/** + * fc_rport_state() - Return a string identifying the remote port's state + * @rdata: The remote port + */ +static const char *fc_rport_state(struct fc_rport_priv *rdata) +{ + const char *cp; + + cp = fc_rport_state_names[rdata->rp_state]; + if (!cp) + cp = "Unknown"; + return cp; +} + +/** + * fc_set_rport_loss_tmo() - Set the remote port loss timeout + * @rport: The remote port that gets a new timeout value + * @timeout: The new timeout value (in seconds) + */ +void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout) +{ + if (timeout) + rport->dev_loss_tmo = timeout; + else + rport->dev_loss_tmo = 1; +} +EXPORT_SYMBOL(fc_set_rport_loss_tmo); + +/** + * fc_plogi_get_maxframe() - Get the maximum payload from the common service + * parameters in a FLOGI frame + * @flp: The FLOGI or PLOGI payload + * @maxval: The maximum frame size upper limit; this may be less than what + * is in the service parameters + */ +static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp, + unsigned int maxval) +{ + unsigned int mfs; + + /* + * Get max payload from the common service parameters and the + * class 3 receive data field size. + */ + mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK; + if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval) + maxval = mfs; + mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs); + if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval) + maxval = mfs; + return maxval; +} + +/** + * fc_rport_state_enter() - Change the state of a remote port + * @rdata: The remote port whose state should change + * @new: The new state + * + * Locking Note: Called with the rport lock held + */ +static void fc_rport_state_enter(struct fc_rport_priv *rdata, + enum fc_rport_state new) +{ + if (rdata->rp_state != new) + rdata->retries = 0; + rdata->rp_state = new; +} + +/** + * fc_rport_work() - Handler for remote port events in the rport_event_queue + * @work: Handle to the remote port being dequeued + */ +static void fc_rport_work(struct work_struct *work) +{ + u32 port_id; + struct fc_rport_priv *rdata = + container_of(work, struct fc_rport_priv, event_work); + struct fc_rport_libfc_priv *rpriv; + enum fc_rport_event event; + struct fc_lport *lport = rdata->local_port; + struct fc_rport_operations *rport_ops; + struct fc_rport_identifiers ids; + struct fc_rport *rport; + struct fc4_prov *prov; + u8 type; + + mutex_lock(&rdata->rp_mutex); + event = rdata->event; + rport_ops = rdata->ops; + rport = rdata->rport; + + FC_RPORT_DBG(rdata, "work event %u\n", event); + + switch (event) { + case RPORT_EV_READY: + ids = rdata->ids; + rdata->event = RPORT_EV_NONE; + rdata->major_retries = 0; + kref_get(&rdata->kref); + mutex_unlock(&rdata->rp_mutex); + + if (!rport) + rport = fc_remote_port_add(lport->host, 0, &ids); + if (!rport) { + FC_RPORT_DBG(rdata, "Failed to add the rport\n"); + lport->tt.rport_logoff(rdata); + kref_put(&rdata->kref, lport->tt.rport_destroy); + return; + } + mutex_lock(&rdata->rp_mutex); + if (rdata->rport) + FC_RPORT_DBG(rdata, "rport already allocated\n"); + rdata->rport = rport; + rport->maxframe_size = rdata->maxframe_size; + rport->supported_classes = rdata->supported_classes; + + rpriv = rport->dd_data; + rpriv->local_port = lport; + rpriv->rp_state = rdata->rp_state; + rpriv->flags = rdata->flags; + rpriv->e_d_tov = rdata->e_d_tov; + rpriv->r_a_tov = rdata->r_a_tov; + mutex_unlock(&rdata->rp_mutex); + + if (rport_ops && rport_ops->event_callback) { + FC_RPORT_DBG(rdata, "callback ev %d\n", event); + rport_ops->event_callback(lport, rdata, event); + } + if (rdata->lld_event_callback) { + FC_RPORT_DBG(rdata, "lld callback ev %d\n", event); + rdata->lld_event_callback(lport, rdata, event); + } + kref_put(&rdata->kref, lport->tt.rport_destroy); + break; + + case RPORT_EV_FAILED: + case RPORT_EV_LOGO: + case RPORT_EV_STOP: + if (rdata->prli_count) { + mutex_lock(&fc_prov_mutex); + for (type = 1; type < FC_FC4_PROV_SIZE; type++) { + prov = fc_passive_prov[type]; + if (prov && prov->prlo) + prov->prlo(rdata); + } + mutex_unlock(&fc_prov_mutex); + } + port_id = rdata->ids.port_id; + mutex_unlock(&rdata->rp_mutex); + + if (rport_ops && rport_ops->event_callback) { + FC_RPORT_DBG(rdata, "callback ev %d\n", event); + rport_ops->event_callback(lport, rdata, event); + } + if (rdata->lld_event_callback) { + FC_RPORT_DBG(rdata, "lld callback ev %d\n", event); + rdata->lld_event_callback(lport, rdata, event); + } + cancel_delayed_work_sync(&rdata->retry_work); + + /* + * Reset any outstanding exchanges before freeing rport. + */ + lport->tt.exch_mgr_reset(lport, 0, port_id); + lport->tt.exch_mgr_reset(lport, port_id, 0); + + if (rport) { + rpriv = rport->dd_data; + rpriv->rp_state = RPORT_ST_DELETE; + mutex_lock(&rdata->rp_mutex); + rdata->rport = NULL; + mutex_unlock(&rdata->rp_mutex); + fc_remote_port_delete(rport); + } + + mutex_lock(&lport->disc.disc_mutex); + mutex_lock(&rdata->rp_mutex); + if (rdata->rp_state == RPORT_ST_DELETE) { + if (port_id == FC_FID_DIR_SERV) { + rdata->event = RPORT_EV_NONE; + mutex_unlock(&rdata->rp_mutex); + kref_put(&rdata->kref, lport->tt.rport_destroy); + } else if ((rdata->flags & FC_RP_STARTED) && + rdata->major_retries < + lport->max_rport_retry_count) { + rdata->major_retries++; + rdata->event = RPORT_EV_NONE; + FC_RPORT_DBG(rdata, "work restart\n"); + fc_rport_enter_flogi(rdata); + mutex_unlock(&rdata->rp_mutex); + } else { + FC_RPORT_DBG(rdata, "work delete\n"); + list_del_rcu(&rdata->peers); + mutex_unlock(&rdata->rp_mutex); + kref_put(&rdata->kref, lport->tt.rport_destroy); + } + } else { + /* + * Re-open for events. Reissue READY event if ready. + */ + rdata->event = RPORT_EV_NONE; + if (rdata->rp_state == RPORT_ST_READY) + fc_rport_enter_ready(rdata); + mutex_unlock(&rdata->rp_mutex); + } + mutex_unlock(&lport->disc.disc_mutex); + break; + + default: + mutex_unlock(&rdata->rp_mutex); + break; + } +} + +/** + * fc_rport_login() - Start the remote port login state machine + * @rdata: The remote port to be logged in to + * + * Locking Note: Called without the rport lock held. This + * function will hold the rport lock, call an _enter_* + * function and then unlock the rport. + * + * This indicates the intent to be logged into the remote port. + * If it appears we are already logged in, ADISC is used to verify + * the setup. + */ +static int fc_rport_login(struct fc_rport_priv *rdata) +{ + mutex_lock(&rdata->rp_mutex); + + rdata->flags |= FC_RP_STARTED; + switch (rdata->rp_state) { + case RPORT_ST_READY: + FC_RPORT_DBG(rdata, "ADISC port\n"); + fc_rport_enter_adisc(rdata); + break; + case RPORT_ST_DELETE: + FC_RPORT_DBG(rdata, "Restart deleted port\n"); + break; + default: + FC_RPORT_DBG(rdata, "Login to port\n"); + fc_rport_enter_flogi(rdata); + break; + } + mutex_unlock(&rdata->rp_mutex); + + return 0; +} + +/** + * fc_rport_enter_delete() - Schedule a remote port to be deleted + * @rdata: The remote port to be deleted + * @event: The event to report as the reason for deletion + * + * Locking Note: Called with the rport lock held. + * + * Allow state change into DELETE only once. + * + * Call queue_work only if there's no event already pending. + * Set the new event so that the old pending event will not occur. + * Since we have the mutex, even if fc_rport_work() is already started, + * it'll see the new event. + */ +static void fc_rport_enter_delete(struct fc_rport_priv *rdata, + enum fc_rport_event event) +{ + if (rdata->rp_state == RPORT_ST_DELETE) + return; + + FC_RPORT_DBG(rdata, "Delete port\n"); + + fc_rport_state_enter(rdata, RPORT_ST_DELETE); + + if (rdata->event == RPORT_EV_NONE) + queue_work(rport_event_queue, &rdata->event_work); + rdata->event = event; +} + +/** + * fc_rport_logoff() - Logoff and remove a remote port + * @rdata: The remote port to be logged off of + * + * Locking Note: Called without the rport lock held. This + * function will hold the rport lock, call an _enter_* + * function and then unlock the rport. + */ +static int fc_rport_logoff(struct fc_rport_priv *rdata) +{ + mutex_lock(&rdata->rp_mutex); + + FC_RPORT_DBG(rdata, "Remove port\n"); + + rdata->flags &= ~FC_RP_STARTED; + if (rdata->rp_state == RPORT_ST_DELETE) { + FC_RPORT_DBG(rdata, "Port in Delete state, not removing\n"); + goto out; + } + fc_rport_enter_logo(rdata); + + /* + * Change the state to Delete so that we discard + * the response. + */ + fc_rport_enter_delete(rdata, RPORT_EV_STOP); +out: + mutex_unlock(&rdata->rp_mutex); + return 0; +} + +/** + * fc_rport_enter_ready() - Transition to the RPORT_ST_READY state + * @rdata: The remote port that is ready + * + * Locking Note: The rport lock is expected to be held before calling + * this routine. + */ +static void fc_rport_enter_ready(struct fc_rport_priv *rdata) +{ + fc_rport_state_enter(rdata, RPORT_ST_READY); + + FC_RPORT_DBG(rdata, "Port is Ready\n"); + + if (rdata->event == RPORT_EV_NONE) + queue_work(rport_event_queue, &rdata->event_work); + rdata->event = RPORT_EV_READY; +} + +/** + * fc_rport_timeout() - Handler for the retry_work timer + * @work: Handle to the remote port that has timed out + * + * Locking Note: Called without the rport lock held. This + * function will hold the rport lock, call an _enter_* + * function and then unlock the rport. + */ +static void fc_rport_timeout(struct work_struct *work) +{ + struct fc_rport_priv *rdata = + container_of(work, struct fc_rport_priv, retry_work.work); + + mutex_lock(&rdata->rp_mutex); + + switch (rdata->rp_state) { + case RPORT_ST_FLOGI: + fc_rport_enter_flogi(rdata); + break; + case RPORT_ST_PLOGI: + fc_rport_enter_plogi(rdata); + break; + case RPORT_ST_PRLI: + fc_rport_enter_prli(rdata); + break; + case RPORT_ST_RTV: + fc_rport_enter_rtv(rdata); + break; + case RPORT_ST_ADISC: + fc_rport_enter_adisc(rdata); + break; + case RPORT_ST_PLOGI_WAIT: + case RPORT_ST_READY: + case RPORT_ST_INIT: + case RPORT_ST_DELETE: + break; + } + + mutex_unlock(&rdata->rp_mutex); +} + +/** + * fc_rport_error() - Error handler, called once retries have been exhausted + * @rdata: The remote port the error is happened on + * @fp: The error code encapsulated in a frame pointer + * + * Locking Note: The rport lock is expected to be held before + * calling this routine + */ +static void fc_rport_error(struct fc_rport_priv *rdata, struct fc_frame *fp) +{ + FC_RPORT_DBG(rdata, "Error %ld in state %s, retries %d\n", + IS_ERR(fp) ? -PTR_ERR(fp) : 0, + fc_rport_state(rdata), rdata->retries); + + switch (rdata->rp_state) { + case RPORT_ST_FLOGI: + case RPORT_ST_PLOGI: + rdata->flags &= ~FC_RP_STARTED; + fc_rport_enter_delete(rdata, RPORT_EV_FAILED); + break; + case RPORT_ST_RTV: + fc_rport_enter_ready(rdata); + break; + case RPORT_ST_PRLI: + case RPORT_ST_ADISC: + fc_rport_enter_logo(rdata); + break; + case RPORT_ST_PLOGI_WAIT: + case RPORT_ST_DELETE: + case RPORT_ST_READY: + case RPORT_ST_INIT: + break; + } +} + +/** + * fc_rport_error_retry() - Handler for remote port state retries + * @rdata: The remote port whose state is to be retried + * @fp: The error code encapsulated in a frame pointer + * + * If the error was an exchange timeout retry immediately, + * otherwise wait for E_D_TOV. + * + * Locking Note: The rport lock is expected to be held before + * calling this routine + */ +static void fc_rport_error_retry(struct fc_rport_priv *rdata, + struct fc_frame *fp) +{ + unsigned long delay = msecs_to_jiffies(FC_DEF_E_D_TOV); + + /* make sure this isn't an FC_EX_CLOSED error, never retry those */ + if (PTR_ERR(fp) == -FC_EX_CLOSED) + goto out; + + if (rdata->retries < rdata->local_port->max_rport_retry_count) { + FC_RPORT_DBG(rdata, "Error %ld in state %s, retrying\n", + PTR_ERR(fp), fc_rport_state(rdata)); + rdata->retries++; + /* no additional delay on exchange timeouts */ + if (PTR_ERR(fp) == -FC_EX_TIMEOUT) + delay = 0; + schedule_delayed_work(&rdata->retry_work, delay); + return; + } + +out: + fc_rport_error(rdata, fp); +} + +/** + * fc_rport_login_complete() - Handle parameters and completion of p-mp login. + * @rdata: The remote port which we logged into or which logged into us. + * @fp: The FLOGI or PLOGI request or response frame + * + * Returns non-zero error if a problem is detected with the frame. + * Does not free the frame. + * + * This is only used in point-to-multipoint mode for FIP currently. + */ +static int fc_rport_login_complete(struct fc_rport_priv *rdata, + struct fc_frame *fp) +{ + struct fc_lport *lport = rdata->local_port; + struct fc_els_flogi *flogi; + unsigned int e_d_tov; + u16 csp_flags; + + flogi = fc_frame_payload_get(fp, sizeof(*flogi)); + if (!flogi) + return -EINVAL; + + csp_flags = ntohs(flogi->fl_csp.sp_features); + + if (fc_frame_payload_op(fp) == ELS_FLOGI) { + if (csp_flags & FC_SP_FT_FPORT) { + FC_RPORT_DBG(rdata, "Fabric bit set in FLOGI\n"); + return -EINVAL; + } + } else { + + /* + * E_D_TOV is not valid on an incoming FLOGI request. + */ + e_d_tov = ntohl(flogi->fl_csp.sp_e_d_tov); + if (csp_flags & FC_SP_FT_EDTR) + e_d_tov /= 1000000; + if (e_d_tov > rdata->e_d_tov) + rdata->e_d_tov = e_d_tov; + } + rdata->maxframe_size = fc_plogi_get_maxframe(flogi, lport->mfs); + return 0; +} + +/** + * fc_rport_flogi_resp() - Handle response to FLOGI request for p-mp mode + * @sp: The sequence that the FLOGI was on + * @fp: The FLOGI response frame + * @rp_arg: The remote port that received the FLOGI response + */ +static void fc_rport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp, + void *rp_arg) +{ + struct fc_rport_priv *rdata = rp_arg; + struct fc_lport *lport = rdata->local_port; + struct fc_els_flogi *flogi; + unsigned int r_a_tov; + + FC_RPORT_DBG(rdata, "Received a FLOGI %s\n", fc_els_resp_type(fp)); + + if (fp == ERR_PTR(-FC_EX_CLOSED)) + goto put; + + mutex_lock(&rdata->rp_mutex); + + if (rdata->rp_state != RPORT_ST_FLOGI) { + FC_RPORT_DBG(rdata, "Received a FLOGI response, but in state " + "%s\n", fc_rport_state(rdata)); + if (IS_ERR(fp)) + goto err; + goto out; + } + + if (IS_ERR(fp)) { + fc_rport_error(rdata, fp); + goto err; + } + + if (fc_frame_payload_op(fp) != ELS_LS_ACC) + goto bad; + if (fc_rport_login_complete(rdata, fp)) + goto bad; + + flogi = fc_frame_payload_get(fp, sizeof(*flogi)); + if (!flogi) + goto bad; + r_a_tov = ntohl(flogi->fl_csp.sp_r_a_tov); + if (r_a_tov > rdata->r_a_tov) + rdata->r_a_tov = r_a_tov; + + if (rdata->ids.port_name < lport->wwpn) + fc_rport_enter_plogi(rdata); + else + fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT); +out: + fc_frame_free(fp); +err: + mutex_unlock(&rdata->rp_mutex); +put: + kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); + return; +bad: + FC_RPORT_DBG(rdata, "Bad FLOGI response\n"); + fc_rport_error_retry(rdata, fp); + goto out; +} + +/** + * fc_rport_enter_flogi() - Send a FLOGI request to the remote port for p-mp + * @rdata: The remote port to send a FLOGI to + * + * Locking Note: The rport lock is expected to be held before calling + * this routine. + */ +static void fc_rport_enter_flogi(struct fc_rport_priv *rdata) +{ + struct fc_lport *lport = rdata->local_port; + struct fc_frame *fp; + + if (!lport->point_to_multipoint) + return fc_rport_enter_plogi(rdata); + + FC_RPORT_DBG(rdata, "Entered FLOGI state from %s state\n", + fc_rport_state(rdata)); + + fc_rport_state_enter(rdata, RPORT_ST_FLOGI); + + fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); + if (!fp) + return fc_rport_error_retry(rdata, fp); + + if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_FLOGI, + fc_rport_flogi_resp, rdata, + 2 * lport->r_a_tov)) + fc_rport_error_retry(rdata, NULL); + else + kref_get(&rdata->kref); +} + +/** + * fc_rport_recv_flogi_req() - Handle Fabric Login (FLOGI) request in p-mp mode + * @lport: The local port that received the PLOGI request + * @rx_fp: The PLOGI request frame + */ +static void fc_rport_recv_flogi_req(struct fc_lport *lport, + struct fc_frame *rx_fp) +{ + struct fc_disc *disc; + struct fc_els_flogi *flp; + struct fc_rport_priv *rdata; + struct fc_frame *fp = rx_fp; + struct fc_seq_els_data rjt_data; + u32 sid; + + sid = fc_frame_sid(fp); + + FC_RPORT_ID_DBG(lport, sid, "Received FLOGI request\n"); + + disc = &lport->disc; + mutex_lock(&disc->disc_mutex); + + if (!lport->point_to_multipoint) { + rjt_data.reason = ELS_RJT_UNSUP; + rjt_data.explan = ELS_EXPL_NONE; + goto reject; + } + + flp = fc_frame_payload_get(fp, sizeof(*flp)); + if (!flp) { + rjt_data.reason = ELS_RJT_LOGIC; + rjt_data.explan = ELS_EXPL_INV_LEN; + goto reject; + } + + rdata = lport->tt.rport_lookup(lport, sid); + if (!rdata) { + rjt_data.reason = ELS_RJT_FIP; + rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR; + goto reject; + } + mutex_lock(&rdata->rp_mutex); + + FC_RPORT_DBG(rdata, "Received FLOGI in %s state\n", + fc_rport_state(rdata)); + + switch (rdata->rp_state) { + case RPORT_ST_INIT: + /* + * If received the FLOGI request on RPORT which is INIT state + * (means not transition to FLOGI either fc_rport timeout + * function didn;t trigger or this end hasn;t received + * beacon yet from other end. In that case only, allow RPORT + * state machine to continue, otherwise fall through which + * causes the code to send reject response. + * NOTE; Not checking for FIP->state such as VNMP_UP or + * VNMP_CLAIM because if FIP state is not one of those, + * RPORT wouldn;t have created and 'rport_lookup' would have + * failed anyway in that case. + */ + if (lport->point_to_multipoint) + break; + case RPORT_ST_DELETE: + mutex_unlock(&rdata->rp_mutex); + rjt_data.reason = ELS_RJT_FIP; + rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR; + goto reject; + case RPORT_ST_FLOGI: + case RPORT_ST_PLOGI_WAIT: + case RPORT_ST_PLOGI: + break; + case RPORT_ST_PRLI: + case RPORT_ST_RTV: + case RPORT_ST_READY: + case RPORT_ST_ADISC: + /* + * Set the remote port to be deleted and to then restart. + * This queues work to be sure exchanges are reset. + */ + fc_rport_enter_delete(rdata, RPORT_EV_LOGO); + mutex_unlock(&rdata->rp_mutex); + rjt_data.reason = ELS_RJT_BUSY; + rjt_data.explan = ELS_EXPL_NONE; + goto reject; + } + if (fc_rport_login_complete(rdata, fp)) { + mutex_unlock(&rdata->rp_mutex); + rjt_data.reason = ELS_RJT_LOGIC; + rjt_data.explan = ELS_EXPL_NONE; + goto reject; + } + + fp = fc_frame_alloc(lport, sizeof(*flp)); + if (!fp) + goto out; + + fc_flogi_fill(lport, fp); + flp = fc_frame_payload_get(fp, sizeof(*flp)); + flp->fl_cmd = ELS_LS_ACC; + + fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); + lport->tt.frame_send(lport, fp); + + if (rdata->ids.port_name < lport->wwpn) + fc_rport_enter_plogi(rdata); + else + fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT); +out: + mutex_unlock(&rdata->rp_mutex); + mutex_unlock(&disc->disc_mutex); + fc_frame_free(rx_fp); + return; + +reject: + mutex_unlock(&disc->disc_mutex); + lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data); + fc_frame_free(rx_fp); +} + +/** + * fc_rport_plogi_resp() - Handler for ELS PLOGI responses + * @sp: The sequence the PLOGI is on + * @fp: The PLOGI response frame + * @rdata_arg: The remote port that sent the PLOGI response + * + * Locking Note: This function will be called without the rport lock + * held, but it will lock, call an _enter_* function or fc_rport_error + * and then unlock the rport. + */ +static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp, + void *rdata_arg) +{ + struct fc_rport_priv *rdata = rdata_arg; + struct fc_lport *lport = rdata->local_port; + struct fc_els_flogi *plp = NULL; + u16 csp_seq; + u16 cssp_seq; + u8 op; + + mutex_lock(&rdata->rp_mutex); + + FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp)); + + if (rdata->rp_state != RPORT_ST_PLOGI) { + FC_RPORT_DBG(rdata, "Received a PLOGI response, but in state " + "%s\n", fc_rport_state(rdata)); + if (IS_ERR(fp)) + goto err; + goto out; + } + + if (IS_ERR(fp)) { + fc_rport_error_retry(rdata, fp); + goto err; + } + + op = fc_frame_payload_op(fp); + if (op == ELS_LS_ACC && + (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) { + rdata->ids.port_name = get_unaligned_be64(&plp->fl_wwpn); + rdata->ids.node_name = get_unaligned_be64(&plp->fl_wwnn); + + /* save plogi response sp_features for further reference */ + rdata->sp_features = ntohs(plp->fl_csp.sp_features); + + if (lport->point_to_multipoint) + fc_rport_login_complete(rdata, fp); + csp_seq = ntohs(plp->fl_csp.sp_tot_seq); + cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq); + if (cssp_seq < csp_seq) + csp_seq = cssp_seq; + rdata->max_seq = csp_seq; + rdata->maxframe_size = fc_plogi_get_maxframe(plp, lport->mfs); + fc_rport_enter_prli(rdata); + } else + fc_rport_error_retry(rdata, fp); + +out: + fc_frame_free(fp); +err: + mutex_unlock(&rdata->rp_mutex); + kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); +} + +static bool +fc_rport_compatible_roles(struct fc_lport *lport, struct fc_rport_priv *rdata) +{ + if (rdata->ids.roles == FC_PORT_ROLE_UNKNOWN) + return true; + if ((rdata->ids.roles & FC_PORT_ROLE_FCP_TARGET) && + (lport->service_params & FCP_SPPF_INIT_FCN)) + return true; + if ((rdata->ids.roles & FC_PORT_ROLE_FCP_INITIATOR) && + (lport->service_params & FCP_SPPF_TARG_FCN)) + return true; + return false; +} + +/** + * fc_rport_enter_plogi() - Send Port Login (PLOGI) request + * @rdata: The remote port to send a PLOGI to + * + * Locking Note: The rport lock is expected to be held before calling + * this routine. + */ +static void fc_rport_enter_plogi(struct fc_rport_priv *rdata) +{ + struct fc_lport *lport = rdata->local_port; + struct fc_frame *fp; + + if (!fc_rport_compatible_roles(lport, rdata)) { + FC_RPORT_DBG(rdata, "PLOGI suppressed for incompatible role\n"); + fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT); + return; + } + + FC_RPORT_DBG(rdata, "Port entered PLOGI state from %s state\n", + fc_rport_state(rdata)); + + fc_rport_state_enter(rdata, RPORT_ST_PLOGI); + + rdata->maxframe_size = FC_MIN_MAX_PAYLOAD; + fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); + if (!fp) { + FC_RPORT_DBG(rdata, "%s frame alloc failed\n", __func__); + fc_rport_error_retry(rdata, fp); + return; + } + rdata->e_d_tov = lport->e_d_tov; + + if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PLOGI, + fc_rport_plogi_resp, rdata, + 2 * lport->r_a_tov)) + fc_rport_error_retry(rdata, NULL); + else + kref_get(&rdata->kref); +} + +/** + * fc_rport_prli_resp() - Process Login (PRLI) response handler + * @sp: The sequence the PRLI response was on + * @fp: The PRLI response frame + * @rdata_arg: The remote port that sent the PRLI response + * + * Locking Note: This function will be called without the rport lock + * held, but it will lock, call an _enter_* function or fc_rport_error + * and then unlock the rport. + */ +static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp, + void *rdata_arg) +{ + struct fc_rport_priv *rdata = rdata_arg; + struct { + struct fc_els_prli prli; + struct fc_els_spp spp; + } *pp; + struct fc_els_spp temp_spp; + struct fc4_prov *prov; + u32 roles = FC_RPORT_ROLE_UNKNOWN; + u32 fcp_parm = 0; + u8 op; + u8 resp_code = 0; + + mutex_lock(&rdata->rp_mutex); + + FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp)); + + if (rdata->rp_state != RPORT_ST_PRLI) { + FC_RPORT_DBG(rdata, "Received a PRLI response, but in state " + "%s\n", fc_rport_state(rdata)); + if (IS_ERR(fp)) + goto err; + goto out; + } + + if (IS_ERR(fp)) { + fc_rport_error_retry(rdata, fp); + goto err; + } + + /* reinitialize remote port roles */ + rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; + + op = fc_frame_payload_op(fp); + if (op == ELS_LS_ACC) { + pp = fc_frame_payload_get(fp, sizeof(*pp)); + if (!pp) + goto out; + + resp_code = (pp->spp.spp_flags & FC_SPP_RESP_MASK); + FC_RPORT_DBG(rdata, "PRLI spp_flags = 0x%x\n", + pp->spp.spp_flags); + rdata->spp_type = pp->spp.spp_type; + if (resp_code != FC_SPP_RESP_ACK) { + if (resp_code == FC_SPP_RESP_CONF) + fc_rport_error(rdata, fp); + else + fc_rport_error_retry(rdata, fp); + goto out; + } + if (pp->prli.prli_spp_len < sizeof(pp->spp)) + goto out; + + fcp_parm = ntohl(pp->spp.spp_params); + if (fcp_parm & FCP_SPPF_RETRY) + rdata->flags |= FC_RP_FLAGS_RETRY; + if (fcp_parm & FCP_SPPF_CONF_COMPL) + rdata->flags |= FC_RP_FLAGS_CONF_REQ; + + prov = fc_passive_prov[FC_TYPE_FCP]; + if (prov) { + memset(&temp_spp, 0, sizeof(temp_spp)); + prov->prli(rdata, pp->prli.prli_spp_len, + &pp->spp, &temp_spp); + } + + rdata->supported_classes = FC_COS_CLASS3; + if (fcp_parm & FCP_SPPF_INIT_FCN) + roles |= FC_RPORT_ROLE_FCP_INITIATOR; + if (fcp_parm & FCP_SPPF_TARG_FCN) + roles |= FC_RPORT_ROLE_FCP_TARGET; + + rdata->ids.roles = roles; + fc_rport_enter_rtv(rdata); + + } else { + FC_RPORT_DBG(rdata, "Bad ELS response for PRLI command\n"); + fc_rport_error_retry(rdata, fp); + } + +out: + fc_frame_free(fp); +err: + mutex_unlock(&rdata->rp_mutex); + kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); +} + +/** + * fc_rport_enter_prli() - Send Process Login (PRLI) request + * @rdata: The remote port to send the PRLI request to + * + * Locking Note: The rport lock is expected to be held before calling + * this routine. + */ +static void fc_rport_enter_prli(struct fc_rport_priv *rdata) +{ + struct fc_lport *lport = rdata->local_port; + struct { + struct fc_els_prli prli; + struct fc_els_spp spp; + } *pp; + struct fc_frame *fp; + struct fc4_prov *prov; + + /* + * If the rport is one of the well known addresses + * we skip PRLI and RTV and go straight to READY. + */ + if (rdata->ids.port_id >= FC_FID_DOM_MGR) { + fc_rport_enter_ready(rdata); + return; + } + + FC_RPORT_DBG(rdata, "Port entered PRLI state from %s state\n", + fc_rport_state(rdata)); + + fc_rport_state_enter(rdata, RPORT_ST_PRLI); + + fp = fc_frame_alloc(lport, sizeof(*pp)); + if (!fp) { + fc_rport_error_retry(rdata, fp); + return; + } + + fc_prli_fill(lport, fp); + + prov = fc_passive_prov[FC_TYPE_FCP]; + if (prov) { + pp = fc_frame_payload_get(fp, sizeof(*pp)); + prov->prli(rdata, sizeof(pp->spp), NULL, &pp->spp); + } + + fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rdata->ids.port_id, + fc_host_port_id(lport->host), FC_TYPE_ELS, + FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); + + if (!lport->tt.exch_seq_send(lport, fp, fc_rport_prli_resp, + NULL, rdata, 2 * lport->r_a_tov)) + fc_rport_error_retry(rdata, NULL); + else + kref_get(&rdata->kref); +} + +/** + * fc_rport_els_rtv_resp() - Handler for Request Timeout Value (RTV) responses + * @sp: The sequence the RTV was on + * @fp: The RTV response frame + * @rdata_arg: The remote port that sent the RTV response + * + * Many targets don't seem to support this. + * + * Locking Note: This function will be called without the rport lock + * held, but it will lock, call an _enter_* function or fc_rport_error + * and then unlock the rport. + */ +static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp, + void *rdata_arg) +{ + struct fc_rport_priv *rdata = rdata_arg; + u8 op; + + mutex_lock(&rdata->rp_mutex); + + FC_RPORT_DBG(rdata, "Received a RTV %s\n", fc_els_resp_type(fp)); + + if (rdata->rp_state != RPORT_ST_RTV) { + FC_RPORT_DBG(rdata, "Received a RTV response, but in state " + "%s\n", fc_rport_state(rdata)); + if (IS_ERR(fp)) + goto err; + goto out; + } + + if (IS_ERR(fp)) { + fc_rport_error(rdata, fp); + goto err; + } + + op = fc_frame_payload_op(fp); + if (op == ELS_LS_ACC) { + struct fc_els_rtv_acc *rtv; + u32 toq; + u32 tov; + + rtv = fc_frame_payload_get(fp, sizeof(*rtv)); + if (rtv) { + toq = ntohl(rtv->rtv_toq); + tov = ntohl(rtv->rtv_r_a_tov); + if (tov == 0) + tov = 1; + rdata->r_a_tov = tov; + tov = ntohl(rtv->rtv_e_d_tov); + if (toq & FC_ELS_RTV_EDRES) + tov /= 1000000; + if (tov == 0) + tov = 1; + rdata->e_d_tov = tov; + } + } + + fc_rport_enter_ready(rdata); + +out: + fc_frame_free(fp); +err: + mutex_unlock(&rdata->rp_mutex); + kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); +} + +/** + * fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request + * @rdata: The remote port to send the RTV request to + * + * Locking Note: The rport lock is expected to be held before calling + * this routine. + */ +static void fc_rport_enter_rtv(struct fc_rport_priv *rdata) +{ + struct fc_frame *fp; + struct fc_lport *lport = rdata->local_port; + + FC_RPORT_DBG(rdata, "Port entered RTV state from %s state\n", + fc_rport_state(rdata)); + + fc_rport_state_enter(rdata, RPORT_ST_RTV); + + fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv)); + if (!fp) { + fc_rport_error_retry(rdata, fp); + return; + } + + if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_RTV, + fc_rport_rtv_resp, rdata, + 2 * lport->r_a_tov)) + fc_rport_error_retry(rdata, NULL); + else + kref_get(&rdata->kref); +} + +/** + * fc_rport_logo_resp() - Handler for logout (LOGO) responses + * @sp: The sequence the LOGO was on + * @fp: The LOGO response frame + * @lport_arg: The local port + */ +static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp, + void *lport_arg) +{ + struct fc_lport *lport = lport_arg; + + FC_RPORT_ID_DBG(lport, fc_seq_exch(sp)->did, + "Received a LOGO %s\n", fc_els_resp_type(fp)); + if (IS_ERR(fp)) + return; + fc_frame_free(fp); +} + +/** + * fc_rport_enter_logo() - Send a logout (LOGO) request + * @rdata: The remote port to send the LOGO request to + * + * Locking Note: The rport lock is expected to be held before calling + * this routine. + */ +static void fc_rport_enter_logo(struct fc_rport_priv *rdata) +{ + struct fc_lport *lport = rdata->local_port; + struct fc_frame *fp; + + FC_RPORT_DBG(rdata, "Port sending LOGO from %s state\n", + fc_rport_state(rdata)); + + fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo)); + if (!fp) + return; + (void)lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO, + fc_rport_logo_resp, lport, 0); +} + +/** + * fc_rport_els_adisc_resp() - Handler for Address Discovery (ADISC) responses + * @sp: The sequence the ADISC response was on + * @fp: The ADISC response frame + * @rdata_arg: The remote port that sent the ADISC response + * + * Locking Note: This function will be called without the rport lock + * held, but it will lock, call an _enter_* function or fc_rport_error + * and then unlock the rport. + */ +static void fc_rport_adisc_resp(struct fc_seq *sp, struct fc_frame *fp, + void *rdata_arg) +{ + struct fc_rport_priv *rdata = rdata_arg; + struct fc_els_adisc *adisc; + u8 op; + + mutex_lock(&rdata->rp_mutex); + + FC_RPORT_DBG(rdata, "Received a ADISC response\n"); + + if (rdata->rp_state != RPORT_ST_ADISC) { + FC_RPORT_DBG(rdata, "Received a ADISC resp but in state %s\n", + fc_rport_state(rdata)); + if (IS_ERR(fp)) + goto err; + goto out; + } + + if (IS_ERR(fp)) { + fc_rport_error(rdata, fp); + goto err; + } + + /* + * If address verification failed. Consider us logged out of the rport. + * Since the rport is still in discovery, we want to be + * logged in, so go to PLOGI state. Otherwise, go back to READY. + */ + op = fc_frame_payload_op(fp); + adisc = fc_frame_payload_get(fp, sizeof(*adisc)); + if (op != ELS_LS_ACC || !adisc || + ntoh24(adisc->adisc_port_id) != rdata->ids.port_id || + get_unaligned_be64(&adisc->adisc_wwpn) != rdata->ids.port_name || + get_unaligned_be64(&adisc->adisc_wwnn) != rdata->ids.node_name) { + FC_RPORT_DBG(rdata, "ADISC error or mismatch\n"); + fc_rport_enter_flogi(rdata); + } else { + FC_RPORT_DBG(rdata, "ADISC OK\n"); + fc_rport_enter_ready(rdata); + } +out: + fc_frame_free(fp); +err: + mutex_unlock(&rdata->rp_mutex); + kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); +} + +/** + * fc_rport_enter_adisc() - Send Address Discover (ADISC) request + * @rdata: The remote port to send the ADISC request to + * + * Locking Note: The rport lock is expected to be held before calling + * this routine. + */ +static void fc_rport_enter_adisc(struct fc_rport_priv *rdata) +{ + struct fc_lport *lport = rdata->local_port; + struct fc_frame *fp; + + FC_RPORT_DBG(rdata, "sending ADISC from %s state\n", + fc_rport_state(rdata)); + + fc_rport_state_enter(rdata, RPORT_ST_ADISC); + + fp = fc_frame_alloc(lport, sizeof(struct fc_els_adisc)); + if (!fp) { + fc_rport_error_retry(rdata, fp); + return; + } + if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_ADISC, + fc_rport_adisc_resp, rdata, + 2 * lport->r_a_tov)) + fc_rport_error_retry(rdata, NULL); + else + kref_get(&rdata->kref); +} + +/** + * fc_rport_recv_adisc_req() - Handler for Address Discovery (ADISC) requests + * @rdata: The remote port that sent the ADISC request + * @in_fp: The ADISC request frame + * + * Locking Note: Called with the lport and rport locks held. + */ +static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata, + struct fc_frame *in_fp) +{ + struct fc_lport *lport = rdata->local_port; + struct fc_frame *fp; + struct fc_els_adisc *adisc; + struct fc_seq_els_data rjt_data; + + FC_RPORT_DBG(rdata, "Received ADISC request\n"); + + adisc = fc_frame_payload_get(in_fp, sizeof(*adisc)); + if (!adisc) { + rjt_data.reason = ELS_RJT_PROT; + rjt_data.explan = ELS_EXPL_INV_LEN; + lport->tt.seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data); + goto drop; + } + + fp = fc_frame_alloc(lport, sizeof(*adisc)); + if (!fp) + goto drop; + fc_adisc_fill(lport, fp); + adisc = fc_frame_payload_get(fp, sizeof(*adisc)); + adisc->adisc_cmd = ELS_LS_ACC; + fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0); + lport->tt.frame_send(lport, fp); +drop: + fc_frame_free(in_fp); +} + +/** + * fc_rport_recv_rls_req() - Handle received Read Link Status request + * @rdata: The remote port that sent the RLS request + * @rx_fp: The PRLI request frame + * + * Locking Note: The rport lock is expected to be held before calling + * this function. + */ +static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata, + struct fc_frame *rx_fp) + +{ + struct fc_lport *lport = rdata->local_port; + struct fc_frame *fp; + struct fc_els_rls *rls; + struct fc_els_rls_resp *rsp; + struct fc_els_lesb *lesb; + struct fc_seq_els_data rjt_data; + struct fc_host_statistics *hst; + + FC_RPORT_DBG(rdata, "Received RLS request while in state %s\n", + fc_rport_state(rdata)); + + rls = fc_frame_payload_get(rx_fp, sizeof(*rls)); + if (!rls) { + rjt_data.reason = ELS_RJT_PROT; + rjt_data.explan = ELS_EXPL_INV_LEN; + goto out_rjt; + } + + fp = fc_frame_alloc(lport, sizeof(*rsp)); + if (!fp) { + rjt_data.reason = ELS_RJT_UNAB; + rjt_data.explan = ELS_EXPL_INSUF_RES; + goto out_rjt; + } + + rsp = fc_frame_payload_get(fp, sizeof(*rsp)); + memset(rsp, 0, sizeof(*rsp)); + rsp->rls_cmd = ELS_LS_ACC; + lesb = &rsp->rls_lesb; + if (lport->tt.get_lesb) { + /* get LESB from LLD if it supports it */ + lport->tt.get_lesb(lport, lesb); + } else { + fc_get_host_stats(lport->host); + hst = &lport->host_stats; + lesb->lesb_link_fail = htonl(hst->link_failure_count); + lesb->lesb_sync_loss = htonl(hst->loss_of_sync_count); + lesb->lesb_sig_loss = htonl(hst->loss_of_signal_count); + lesb->lesb_prim_err = htonl(hst->prim_seq_protocol_err_count); + lesb->lesb_inv_word = htonl(hst->invalid_tx_word_count); + lesb->lesb_inv_crc = htonl(hst->invalid_crc_count); + } + + fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); + lport->tt.frame_send(lport, fp); + goto out; + +out_rjt: + lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data); +out: + fc_frame_free(rx_fp); +} + +/** + * fc_rport_recv_els_req() - Handler for validated ELS requests + * @lport: The local port that received the ELS request + * @fp: The ELS request frame + * + * Handle incoming ELS requests that require port login. + * The ELS opcode has already been validated by the caller. + * + * Locking Note: Called with the lport lock held. + */ +static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_frame *fp) +{ + struct fc_rport_priv *rdata; + struct fc_seq_els_data els_data; + + mutex_lock(&lport->disc.disc_mutex); + rdata = lport->tt.rport_lookup(lport, fc_frame_sid(fp)); + if (!rdata) { + mutex_unlock(&lport->disc.disc_mutex); + goto reject; + } + mutex_lock(&rdata->rp_mutex); + mutex_unlock(&lport->disc.disc_mutex); + + switch (rdata->rp_state) { + case RPORT_ST_PRLI: + case RPORT_ST_RTV: + case RPORT_ST_READY: + case RPORT_ST_ADISC: + break; + default: + mutex_unlock(&rdata->rp_mutex); + goto reject; + } + + switch (fc_frame_payload_op(fp)) { + case ELS_PRLI: + fc_rport_recv_prli_req(rdata, fp); + break; + case ELS_PRLO: + fc_rport_recv_prlo_req(rdata, fp); + break; + case ELS_ADISC: + fc_rport_recv_adisc_req(rdata, fp); + break; + case ELS_RRQ: + lport->tt.seq_els_rsp_send(fp, ELS_RRQ, NULL); + fc_frame_free(fp); + break; + case ELS_REC: + lport->tt.seq_els_rsp_send(fp, ELS_REC, NULL); + fc_frame_free(fp); + break; + case ELS_RLS: + fc_rport_recv_rls_req(rdata, fp); + break; + default: + fc_frame_free(fp); /* can't happen */ + break; + } + + mutex_unlock(&rdata->rp_mutex); + return; + +reject: + els_data.reason = ELS_RJT_UNAB; + els_data.explan = ELS_EXPL_PLOGI_REQD; + lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &els_data); + fc_frame_free(fp); +} + +/** + * fc_rport_recv_req() - Handler for requests + * @lport: The local port that received the request + * @fp: The request frame + * + * Locking Note: Called with the lport lock held. + */ +static void fc_rport_recv_req(struct fc_lport *lport, struct fc_frame *fp) +{ + struct fc_seq_els_data els_data; + + /* + * Handle FLOGI, PLOGI and LOGO requests separately, since they + * don't require prior login. + * Check for unsupported opcodes first and reject them. + * For some ops, it would be incorrect to reject with "PLOGI required". + */ + switch (fc_frame_payload_op(fp)) { + case ELS_FLOGI: + fc_rport_recv_flogi_req(lport, fp); + break; + case ELS_PLOGI: + fc_rport_recv_plogi_req(lport, fp); + break; + case ELS_LOGO: + fc_rport_recv_logo_req(lport, fp); + break; + case ELS_PRLI: + case ELS_PRLO: + case ELS_ADISC: + case ELS_RRQ: + case ELS_REC: + case ELS_RLS: + fc_rport_recv_els_req(lport, fp); + break; + default: + els_data.reason = ELS_RJT_UNSUP; + els_data.explan = ELS_EXPL_NONE; + lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &els_data); + fc_frame_free(fp); + break; + } +} + +/** + * fc_rport_recv_plogi_req() - Handler for Port Login (PLOGI) requests + * @lport: The local port that received the PLOGI request + * @rx_fp: The PLOGI request frame + * + * Locking Note: The rport lock is held before calling this function. + */ +static void fc_rport_recv_plogi_req(struct fc_lport *lport, + struct fc_frame *rx_fp) +{ + struct fc_disc *disc; + struct fc_rport_priv *rdata; + struct fc_frame *fp = rx_fp; + struct fc_els_flogi *pl; + struct fc_seq_els_data rjt_data; + u32 sid; + + sid = fc_frame_sid(fp); + + FC_RPORT_ID_DBG(lport, sid, "Received PLOGI request\n"); + + pl = fc_frame_payload_get(fp, sizeof(*pl)); + if (!pl) { + FC_RPORT_ID_DBG(lport, sid, "Received PLOGI too short\n"); + rjt_data.reason = ELS_RJT_PROT; + rjt_data.explan = ELS_EXPL_INV_LEN; + goto reject; + } + + disc = &lport->disc; + mutex_lock(&disc->disc_mutex); + rdata = lport->tt.rport_create(lport, sid); + if (!rdata) { + mutex_unlock(&disc->disc_mutex); + rjt_data.reason = ELS_RJT_UNAB; + rjt_data.explan = ELS_EXPL_INSUF_RES; + goto reject; + } + + mutex_lock(&rdata->rp_mutex); + mutex_unlock(&disc->disc_mutex); + + rdata->ids.port_name = get_unaligned_be64(&pl->fl_wwpn); + rdata->ids.node_name = get_unaligned_be64(&pl->fl_wwnn); + + /* + * If the rport was just created, possibly due to the incoming PLOGI, + * set the state appropriately and accept the PLOGI. + * + * If we had also sent a PLOGI, and if the received PLOGI is from a + * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason + * "command already in progress". + * + * XXX TBD: If the session was ready before, the PLOGI should result in + * all outstanding exchanges being reset. + */ + switch (rdata->rp_state) { + case RPORT_ST_INIT: + FC_RPORT_DBG(rdata, "Received PLOGI in INIT state\n"); + break; + case RPORT_ST_PLOGI_WAIT: + FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI_WAIT state\n"); + break; + case RPORT_ST_PLOGI: + FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state\n"); + if (rdata->ids.port_name < lport->wwpn) { + mutex_unlock(&rdata->rp_mutex); + rjt_data.reason = ELS_RJT_INPROG; + rjt_data.explan = ELS_EXPL_NONE; + goto reject; + } + break; + case RPORT_ST_PRLI: + case RPORT_ST_RTV: + case RPORT_ST_READY: + case RPORT_ST_ADISC: + FC_RPORT_DBG(rdata, "Received PLOGI in logged-in state %d " + "- ignored for now\n", rdata->rp_state); + /* XXX TBD - should reset */ + break; + case RPORT_ST_FLOGI: + case RPORT_ST_DELETE: + FC_RPORT_DBG(rdata, "Received PLOGI in state %s - send busy\n", + fc_rport_state(rdata)); + mutex_unlock(&rdata->rp_mutex); + rjt_data.reason = ELS_RJT_BUSY; + rjt_data.explan = ELS_EXPL_NONE; + goto reject; + } + if (!fc_rport_compatible_roles(lport, rdata)) { + FC_RPORT_DBG(rdata, "Received PLOGI for incompatible role\n"); + mutex_unlock(&rdata->rp_mutex); + rjt_data.reason = ELS_RJT_LOGIC; + rjt_data.explan = ELS_EXPL_NONE; + goto reject; + } + + /* + * Get session payload size from incoming PLOGI. + */ + rdata->maxframe_size = fc_plogi_get_maxframe(pl, lport->mfs); + + /* + * Send LS_ACC. If this fails, the originator should retry. + */ + fp = fc_frame_alloc(lport, sizeof(*pl)); + if (!fp) + goto out; + + fc_plogi_fill(lport, fp, ELS_LS_ACC); + fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); + lport->tt.frame_send(lport, fp); + fc_rport_enter_prli(rdata); +out: + mutex_unlock(&rdata->rp_mutex); + fc_frame_free(rx_fp); + return; + +reject: + lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data); + fc_frame_free(fp); +} + +/** + * fc_rport_recv_prli_req() - Handler for process login (PRLI) requests + * @rdata: The remote port that sent the PRLI request + * @rx_fp: The PRLI request frame + * + * Locking Note: The rport lock is expected to be held before calling + * this function. + */ +static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata, + struct fc_frame *rx_fp) +{ + struct fc_lport *lport = rdata->local_port; + struct fc_frame *fp; + struct { + struct fc_els_prli prli; + struct fc_els_spp spp; + } *pp; + struct fc_els_spp *rspp; /* request service param page */ + struct fc_els_spp *spp; /* response spp */ + unsigned int len; + unsigned int plen; + enum fc_els_spp_resp resp; + enum fc_els_spp_resp passive; + struct fc_seq_els_data rjt_data; + struct fc4_prov *prov; + + FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n", + fc_rport_state(rdata)); + + len = fr_len(rx_fp) - sizeof(struct fc_frame_header); + pp = fc_frame_payload_get(rx_fp, sizeof(*pp)); + if (!pp) + goto reject_len; + plen = ntohs(pp->prli.prli_len); + if ((plen % 4) != 0 || plen > len || plen < 16) + goto reject_len; + if (plen < len) + len = plen; + plen = pp->prli.prli_spp_len; + if ((plen % 4) != 0 || plen < sizeof(*spp) || + plen > len || len < sizeof(*pp) || plen < 12) + goto reject_len; + rspp = &pp->spp; + + fp = fc_frame_alloc(lport, len); + if (!fp) { + rjt_data.reason = ELS_RJT_UNAB; + rjt_data.explan = ELS_EXPL_INSUF_RES; + goto reject; + } + pp = fc_frame_payload_get(fp, len); + WARN_ON(!pp); + memset(pp, 0, len); + pp->prli.prli_cmd = ELS_LS_ACC; + pp->prli.prli_spp_len = plen; + pp->prli.prli_len = htons(len); + len -= sizeof(struct fc_els_prli); + + /* + * Go through all the service parameter pages and build + * response. If plen indicates longer SPP than standard, + * use that. The entire response has been pre-cleared above. + */ + spp = &pp->spp; + mutex_lock(&fc_prov_mutex); + while (len >= plen) { + rdata->spp_type = rspp->spp_type; + spp->spp_type = rspp->spp_type; + spp->spp_type_ext = rspp->spp_type_ext; + resp = 0; + + if (rspp->spp_type < FC_FC4_PROV_SIZE) { + prov = fc_active_prov[rspp->spp_type]; + if (prov) + resp = prov->prli(rdata, plen, rspp, spp); + prov = fc_passive_prov[rspp->spp_type]; + if (prov) { + passive = prov->prli(rdata, plen, rspp, spp); + if (!resp || passive == FC_SPP_RESP_ACK) + resp = passive; + } + } + if (!resp) { + if (spp->spp_flags & FC_SPP_EST_IMG_PAIR) + resp |= FC_SPP_RESP_CONF; + else + resp |= FC_SPP_RESP_INVL; + } + spp->spp_flags |= resp; + len -= plen; + rspp = (struct fc_els_spp *)((char *)rspp + plen); + spp = (struct fc_els_spp *)((char *)spp + plen); + } + mutex_unlock(&fc_prov_mutex); + + /* + * Send LS_ACC. If this fails, the originator should retry. + */ + fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); + lport->tt.frame_send(lport, fp); + + switch (rdata->rp_state) { + case RPORT_ST_PRLI: + fc_rport_enter_ready(rdata); + break; + default: + break; + } + goto drop; + +reject_len: + rjt_data.reason = ELS_RJT_PROT; + rjt_data.explan = ELS_EXPL_INV_LEN; +reject: + lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data); +drop: + fc_frame_free(rx_fp); +} + +/** + * fc_rport_recv_prlo_req() - Handler for process logout (PRLO) requests + * @rdata: The remote port that sent the PRLO request + * @rx_fp: The PRLO request frame + * + * Locking Note: The rport lock is expected to be held before calling + * this function. + */ +static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata, + struct fc_frame *rx_fp) +{ + struct fc_lport *lport = rdata->local_port; + struct fc_frame *fp; + struct { + struct fc_els_prlo prlo; + struct fc_els_spp spp; + } *pp; + struct fc_els_spp *rspp; /* request service param page */ + struct fc_els_spp *spp; /* response spp */ + unsigned int len; + unsigned int plen; + struct fc_seq_els_data rjt_data; + + FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n", + fc_rport_state(rdata)); + + len = fr_len(rx_fp) - sizeof(struct fc_frame_header); + pp = fc_frame_payload_get(rx_fp, sizeof(*pp)); + if (!pp) + goto reject_len; + plen = ntohs(pp->prlo.prlo_len); + if (plen != 20) + goto reject_len; + if (plen < len) + len = plen; + + rspp = &pp->spp; + + fp = fc_frame_alloc(lport, len); + if (!fp) { + rjt_data.reason = ELS_RJT_UNAB; + rjt_data.explan = ELS_EXPL_INSUF_RES; + goto reject; + } + + pp = fc_frame_payload_get(fp, len); + WARN_ON(!pp); + memset(pp, 0, len); + pp->prlo.prlo_cmd = ELS_LS_ACC; + pp->prlo.prlo_obs = 0x10; + pp->prlo.prlo_len = htons(len); + spp = &pp->spp; + spp->spp_type = rspp->spp_type; + spp->spp_type_ext = rspp->spp_type_ext; + spp->spp_flags = FC_SPP_RESP_ACK; + + fc_rport_enter_delete(rdata, RPORT_EV_LOGO); + + fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); + lport->tt.frame_send(lport, fp); + goto drop; + +reject_len: + rjt_data.reason = ELS_RJT_PROT; + rjt_data.explan = ELS_EXPL_INV_LEN; +reject: + lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data); +drop: + fc_frame_free(rx_fp); +} + +/** + * fc_rport_recv_logo_req() - Handler for logout (LOGO) requests + * @lport: The local port that received the LOGO request + * @fp: The LOGO request frame + * + * Locking Note: The rport lock is expected to be held before calling + * this function. + */ +static void fc_rport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp) +{ + struct fc_rport_priv *rdata; + u32 sid; + + lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL); + + sid = fc_frame_sid(fp); + + mutex_lock(&lport->disc.disc_mutex); + rdata = lport->tt.rport_lookup(lport, sid); + if (rdata) { + mutex_lock(&rdata->rp_mutex); + FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n", + fc_rport_state(rdata)); + + fc_rport_enter_delete(rdata, RPORT_EV_LOGO); + mutex_unlock(&rdata->rp_mutex); + } else + FC_RPORT_ID_DBG(lport, sid, + "Received LOGO from non-logged-in port\n"); + mutex_unlock(&lport->disc.disc_mutex); + fc_frame_free(fp); +} + +/** + * fc_rport_flush_queue() - Flush the rport_event_queue + */ +static void fc_rport_flush_queue(void) +{ + flush_workqueue(rport_event_queue); +} + +/** + * fc_rport_init() - Initialize the remote port layer for a local port + * @lport: The local port to initialize the remote port layer for + */ +int fc_rport_init(struct fc_lport *lport) +{ + if (!lport->tt.rport_lookup) + lport->tt.rport_lookup = fc_rport_lookup; + + if (!lport->tt.rport_create) + lport->tt.rport_create = fc_rport_create; + + if (!lport->tt.rport_login) + lport->tt.rport_login = fc_rport_login; + + if (!lport->tt.rport_logoff) + lport->tt.rport_logoff = fc_rport_logoff; + + if (!lport->tt.rport_recv_req) + lport->tt.rport_recv_req = fc_rport_recv_req; + + if (!lport->tt.rport_flush_queue) + lport->tt.rport_flush_queue = fc_rport_flush_queue; + + if (!lport->tt.rport_destroy) + lport->tt.rport_destroy = fc_rport_destroy; + + return 0; +} +EXPORT_SYMBOL(fc_rport_init); + +/** + * fc_rport_fcp_prli() - Handle incoming PRLI for the FCP initiator. + * @rdata: remote port private + * @spp_len: service parameter page length + * @rspp: received service parameter page + * @spp: response service parameter page + * + * Returns the value for the response code to be placed in spp_flags; + * Returns 0 if not an initiator. + */ +static int fc_rport_fcp_prli(struct fc_rport_priv *rdata, u32 spp_len, + const struct fc_els_spp *rspp, + struct fc_els_spp *spp) +{ + struct fc_lport *lport = rdata->local_port; + u32 fcp_parm; + + fcp_parm = ntohl(rspp->spp_params); + rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; + if (fcp_parm & FCP_SPPF_INIT_FCN) + rdata->ids.roles |= FC_RPORT_ROLE_FCP_INITIATOR; + if (fcp_parm & FCP_SPPF_TARG_FCN) + rdata->ids.roles |= FC_RPORT_ROLE_FCP_TARGET; + if (fcp_parm & FCP_SPPF_RETRY) + rdata->flags |= FC_RP_FLAGS_RETRY; + rdata->supported_classes = FC_COS_CLASS3; + + if (!(lport->service_params & FCP_SPPF_INIT_FCN)) + return 0; + + spp->spp_flags |= rspp->spp_flags & FC_SPP_EST_IMG_PAIR; + + /* + * OR in our service parameters with other providers (target), if any. + */ + fcp_parm = ntohl(spp->spp_params); + spp->spp_params = htonl(fcp_parm | lport->service_params); + return FC_SPP_RESP_ACK; +} + +/* + * FC-4 provider ops for FCP initiator. + */ +struct fc4_prov fc_rport_fcp_init = { + .prli = fc_rport_fcp_prli, +}; + +/** + * fc_rport_t0_prli() - Handle incoming PRLI parameters for type 0 + * @rdata: remote port private + * @spp_len: service parameter page length + * @rspp: received service parameter page + * @spp: response service parameter page + */ +static int fc_rport_t0_prli(struct fc_rport_priv *rdata, u32 spp_len, + const struct fc_els_spp *rspp, + struct fc_els_spp *spp) +{ + if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR) + return FC_SPP_RESP_INVL; + return FC_SPP_RESP_ACK; +} + +/* + * FC-4 provider ops for type 0 service parameters. + * + * This handles the special case of type 0 which is always successful + * but doesn't do anything otherwise. + */ +struct fc4_prov fc_rport_t0_prov = { + .prli = fc_rport_t0_prli, +}; + +/** + * fc_setup_rport() - Initialize the rport_event_queue + */ +int fc_setup_rport(void) +{ + rport_event_queue = create_singlethread_workqueue("fc_rport_eq"); + if (!rport_event_queue) + return -ENOMEM; + return 0; +} + +/** + * fc_destroy_rport() - Destroy the rport_event_queue + */ +void fc_destroy_rport(void) +{ + destroy_workqueue(rport_event_queue); +} + +/** + * fc_rport_terminate_io() - Stop all outstanding I/O on a remote port + * @rport: The remote port whose I/O should be terminated + */ +void fc_rport_terminate_io(struct fc_rport *rport) +{ + struct fc_rport_libfc_priv *rpriv = rport->dd_data; + struct fc_lport *lport = rpriv->local_port; + + lport->tt.exch_mgr_reset(lport, 0, rport->port_id); + lport->tt.exch_mgr_reset(lport, rport->port_id, 0); +} +EXPORT_SYMBOL(fc_rport_terminate_io); |