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-rw-r--r--drivers/scsi/libfc/fc_rport.c1291
1 files changed, 1291 insertions, 0 deletions
diff --git a/drivers/scsi/libfc/fc_rport.c b/drivers/scsi/libfc/fc_rport.c
new file mode 100644
index 0000000..e780d8c
--- /dev/null
+++ b/drivers/scsi/libfc/fc_rport.c
@@ -0,0 +1,1291 @@
+/*
+ * 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 heirarchy.
+ *
+ * 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/rcupdate.h>
+#include <linux/timer.h>
+#include <linux/workqueue.h>
+#include <asm/unaligned.h>
+
+#include <scsi/libfc.h>
+#include <scsi/fc_encode.h>
+
+static int fc_rport_debug;
+
+#define FC_DEBUG_RPORT(fmt...) \
+ do { \
+ if (fc_rport_debug) \
+ FC_DBG(fmt); \
+ } while (0)
+
+struct workqueue_struct *rport_event_queue;
+
+static void fc_rport_enter_plogi(struct fc_rport *);
+static void fc_rport_enter_prli(struct fc_rport *);
+static void fc_rport_enter_rtv(struct fc_rport *);
+static void fc_rport_enter_ready(struct fc_rport *);
+static void fc_rport_enter_logo(struct fc_rport *);
+
+static void fc_rport_recv_plogi_req(struct fc_rport *,
+ struct fc_seq *, struct fc_frame *);
+static void fc_rport_recv_prli_req(struct fc_rport *,
+ struct fc_seq *, struct fc_frame *);
+static void fc_rport_recv_prlo_req(struct fc_rport *,
+ struct fc_seq *, struct fc_frame *);
+static void fc_rport_recv_logo_req(struct fc_rport *,
+ struct fc_seq *, struct fc_frame *);
+static void fc_rport_timeout(struct work_struct *);
+static void fc_rport_error(struct fc_rport *, struct fc_frame *);
+static void fc_rport_work(struct work_struct *);
+
+static const char *fc_rport_state_names[] = {
+ [RPORT_ST_NONE] = "None",
+ [RPORT_ST_INIT] = "Init",
+ [RPORT_ST_PLOGI] = "PLOGI",
+ [RPORT_ST_PRLI] = "PRLI",
+ [RPORT_ST_RTV] = "RTV",
+ [RPORT_ST_READY] = "Ready",
+ [RPORT_ST_LOGO] = "LOGO",
+};
+
+static void fc_rport_rogue_destroy(struct device *dev)
+{
+ struct fc_rport *rport = dev_to_rport(dev);
+ FC_DEBUG_RPORT("Destroying rogue rport (%6x)\n", rport->port_id);
+ kfree(rport);
+}
+
+struct fc_rport *fc_rport_rogue_create(struct fc_disc_port *dp)
+{
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rdata;
+ rport = kzalloc(sizeof(*rport) + sizeof(*rdata), GFP_KERNEL);
+
+ if (!rport)
+ return NULL;
+
+ rdata = RPORT_TO_PRIV(rport);
+
+ rport->dd_data = rdata;
+ rport->port_id = dp->ids.port_id;
+ rport->port_name = dp->ids.port_name;
+ rport->node_name = dp->ids.node_name;
+ rport->roles = dp->ids.roles;
+ rport->maxframe_size = FC_MIN_MAX_PAYLOAD;
+ /*
+ * Note: all this libfc rogue rport code will be removed for
+ * upstream so it fine that this is really ugly and hacky right now.
+ */
+ device_initialize(&rport->dev);
+ rport->dev.release = fc_rport_rogue_destroy;
+
+ mutex_init(&rdata->rp_mutex);
+ rdata->local_port = dp->lp;
+ rdata->trans_state = FC_PORTSTATE_ROGUE;
+ rdata->rp_state = RPORT_ST_INIT;
+ rdata->event = RPORT_EV_NONE;
+ rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
+ rdata->ops = NULL;
+ rdata->e_d_tov = dp->lp->e_d_tov;
+ rdata->r_a_tov = dp->lp->r_a_tov;
+ INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout);
+ INIT_WORK(&rdata->event_work, fc_rport_work);
+ /*
+ * For good measure, but not necessary as we should only
+ * add REAL rport to the lport list.
+ */
+ INIT_LIST_HEAD(&rdata->peers);
+
+ return rport;
+}
+
+/**
+ * fc_rport_state - return a string for the state the rport is in
+ * @rport: The rport whose state we want to get a string for
+ */
+static const char *fc_rport_state(struct fc_rport *rport)
+{
+ const char *cp;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+
+ 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 in seconds.
+ * @rport: Pointer to Fibre Channel remote port structure
+ * @timeout: timeout in seconds
+ */
+void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout)
+{
+ if (timeout)
+ rport->dev_loss_tmo = timeout + 5;
+ else
+ rport->dev_loss_tmo = 30;
+}
+EXPORT_SYMBOL(fc_set_rport_loss_tmo);
+
+/**
+ * fc_plogi_get_maxframe - Get max payload from the common service parameters
+ * @flp: FLOGI payload structure
+ * @maxval: upper limit, 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 rport's state
+ * @rport: The rport whose state should change
+ * @new: The new state of the rport
+ *
+ * Locking Note: Called with the rport lock held
+ */
+static void fc_rport_state_enter(struct fc_rport *rport,
+ enum fc_rport_state new)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ if (rdata->rp_state != new)
+ rdata->retries = 0;
+ rdata->rp_state = new;
+}
+
+static void fc_rport_work(struct work_struct *work)
+{
+ struct fc_rport_libfc_priv *rdata =
+ container_of(work, struct fc_rport_libfc_priv, event_work);
+ enum fc_rport_event event;
+ enum fc_rport_trans_state trans_state;
+ struct fc_lport *lport = rdata->local_port;
+ struct fc_rport_operations *rport_ops;
+ struct fc_rport *rport = PRIV_TO_RPORT(rdata);
+
+ mutex_lock(&rdata->rp_mutex);
+ event = rdata->event;
+ rport_ops = rdata->ops;
+
+ if (event == RPORT_EV_CREATED) {
+ struct fc_rport *new_rport;
+ struct fc_rport_libfc_priv *new_rdata;
+ struct fc_rport_identifiers ids;
+
+ ids.port_id = rport->port_id;
+ ids.roles = rport->roles;
+ ids.port_name = rport->port_name;
+ ids.node_name = rport->node_name;
+
+ mutex_unlock(&rdata->rp_mutex);
+
+ new_rport = fc_remote_port_add(lport->host, 0, &ids);
+ if (new_rport) {
+ /*
+ * Switch from the rogue rport to the rport
+ * returned by the FC class.
+ */
+ new_rport->maxframe_size = rport->maxframe_size;
+
+ new_rdata = new_rport->dd_data;
+ new_rdata->e_d_tov = rdata->e_d_tov;
+ new_rdata->r_a_tov = rdata->r_a_tov;
+ new_rdata->ops = rdata->ops;
+ new_rdata->local_port = rdata->local_port;
+ new_rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
+ new_rdata->trans_state = FC_PORTSTATE_REAL;
+ mutex_init(&new_rdata->rp_mutex);
+ INIT_DELAYED_WORK(&new_rdata->retry_work,
+ fc_rport_timeout);
+ INIT_LIST_HEAD(&new_rdata->peers);
+ INIT_WORK(&new_rdata->event_work, fc_rport_work);
+
+ fc_rport_state_enter(new_rport, RPORT_ST_READY);
+ } else {
+ FC_DBG("Failed to create the rport for port "
+ "(%6x).\n", ids.port_id);
+ event = RPORT_EV_FAILED;
+ }
+ put_device(&rport->dev);
+ rport = new_rport;
+ rdata = new_rport->dd_data;
+ if (rport_ops->event_callback)
+ rport_ops->event_callback(lport, rport, event);
+ } else if ((event == RPORT_EV_FAILED) ||
+ (event == RPORT_EV_LOGO) ||
+ (event == RPORT_EV_STOP)) {
+ trans_state = rdata->trans_state;
+ mutex_unlock(&rdata->rp_mutex);
+ if (rport_ops->event_callback)
+ rport_ops->event_callback(lport, rport, event);
+ if (trans_state == FC_PORTSTATE_ROGUE)
+ put_device(&rport->dev);
+ else
+ fc_remote_port_delete(rport);
+ } else
+ mutex_unlock(&rdata->rp_mutex);
+}
+
+/**
+ * fc_rport_login - Start the remote port login state machine
+ * @rport: Fibre Channel remote port
+ *
+ * Locking Note: Called without the rport lock held. This
+ * function will hold the rport lock, call an _enter_*
+ * function and then unlock the rport.
+ */
+int fc_rport_login(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Login to port (%6x)\n", rport->port_id);
+
+ fc_rport_enter_plogi(rport);
+
+ mutex_unlock(&rdata->rp_mutex);
+
+ return 0;
+}
+
+/**
+ * fc_rport_logoff - Logoff and remove an rport
+ * @rport: Fibre Channel remote port to be removed
+ *
+ * Locking Note: Called without the rport lock held. This
+ * function will hold the rport lock, call an _enter_*
+ * function and then unlock the rport.
+ */
+int fc_rport_logoff(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Remove port (%6x)\n", rport->port_id);
+
+ fc_rport_enter_logo(rport);
+
+ /*
+ * Change the state to NONE so that we discard
+ * the response.
+ */
+ fc_rport_state_enter(rport, RPORT_ST_NONE);
+
+ mutex_unlock(&rdata->rp_mutex);
+
+ cancel_delayed_work_sync(&rdata->retry_work);
+
+ mutex_lock(&rdata->rp_mutex);
+
+ rdata->event = RPORT_EV_STOP;
+ queue_work(rport_event_queue, &rdata->event_work);
+
+ mutex_unlock(&rdata->rp_mutex);
+
+ return 0;
+}
+
+/**
+ * fc_rport_enter_ready - The rport is ready
+ * @rport: Fibre Channel 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 *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+
+ fc_rport_state_enter(rport, RPORT_ST_READY);
+
+ FC_DEBUG_RPORT("Port (%6x) is Ready\n", rport->port_id);
+
+ rdata->event = RPORT_EV_CREATED;
+ queue_work(rport_event_queue, &rdata->event_work);
+}
+
+/**
+ * fc_rport_timeout - Handler for the retry_work timer.
+ * @work: The work struct of the fc_rport_libfc_priv
+ *
+ * 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_libfc_priv *rdata =
+ container_of(work, struct fc_rport_libfc_priv, retry_work.work);
+ struct fc_rport *rport = PRIV_TO_RPORT(rdata);
+
+ mutex_lock(&rdata->rp_mutex);
+
+ switch (rdata->rp_state) {
+ case RPORT_ST_PLOGI:
+ fc_rport_enter_plogi(rport);
+ break;
+ case RPORT_ST_PRLI:
+ fc_rport_enter_prli(rport);
+ break;
+ case RPORT_ST_RTV:
+ fc_rport_enter_rtv(rport);
+ break;
+ case RPORT_ST_LOGO:
+ fc_rport_enter_logo(rport);
+ break;
+ case RPORT_ST_READY:
+ case RPORT_ST_INIT:
+ case RPORT_ST_NONE:
+ break;
+ }
+
+ mutex_unlock(&rdata->rp_mutex);
+ put_device(&rport->dev);
+}
+
+/**
+ * fc_rport_error - Handler for any errors
+ * @rport: The fc_rport object
+ * @fp: The frame pointer
+ *
+ * If the error was caused by a resource allocation failure
+ * then wait for half a second and retry, otherwise retry
+ * immediately.
+ *
+ * Locking Note: The rport lock is expected to be held before
+ * calling this routine
+ */
+static void fc_rport_error(struct fc_rport *rport, struct fc_frame *fp)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ unsigned long delay = 0;
+
+ FC_DEBUG_RPORT("Error %ld in state %s, retries %d\n",
+ PTR_ERR(fp), fc_rport_state(rport), rdata->retries);
+
+ if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) {
+ /*
+ * Memory allocation failure, or the exchange timed out.
+ * Retry after delay
+ */
+ if (rdata->retries < rdata->local_port->max_retry_count) {
+ rdata->retries++;
+ if (!fp)
+ delay = msecs_to_jiffies(500);
+ get_device(&rport->dev);
+ schedule_delayed_work(&rdata->retry_work, delay);
+ } else {
+ switch (rdata->rp_state) {
+ case RPORT_ST_PLOGI:
+ case RPORT_ST_PRLI:
+ case RPORT_ST_LOGO:
+ rdata->event = RPORT_EV_FAILED;
+ queue_work(rport_event_queue,
+ &rdata->event_work);
+ break;
+ case RPORT_ST_RTV:
+ fc_rport_enter_ready(rport);
+ break;
+ case RPORT_ST_NONE:
+ case RPORT_ST_READY:
+ case RPORT_ST_INIT:
+ break;
+ }
+ }
+ }
+}
+
+/**
+ * fc_rport_plogi_recv_resp - Handle incoming ELS PLOGI response
+ * @sp: current sequence in the PLOGI exchange
+ * @fp: response frame
+ * @rp_arg: Fibre Channel remote port
+ *
+ * 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 *rp_arg)
+{
+ struct fc_rport *rport = rp_arg;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+ struct fc_els_flogi *plp;
+ unsigned int tov;
+ u16 csp_seq;
+ u16 cssp_seq;
+ u8 op;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Received a PLOGI response from port (%6x)\n",
+ rport->port_id);
+
+ if (rdata->rp_state != RPORT_ST_PLOGI) {
+ FC_DBG("Received a PLOGI response, but in state %s\n",
+ fc_rport_state(rport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_rport_error(rport, fp);
+ goto err;
+ }
+
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC &&
+ (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) {
+ rport->port_name = get_unaligned_be64(&plp->fl_wwpn);
+ rport->node_name = get_unaligned_be64(&plp->fl_wwnn);
+
+ tov = ntohl(plp->fl_csp.sp_e_d_tov);
+ if (ntohs(plp->fl_csp.sp_features) & FC_SP_FT_EDTR)
+ tov /= 1000;
+ if (tov > rdata->e_d_tov)
+ rdata->e_d_tov = tov;
+ 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;
+ rport->maxframe_size =
+ fc_plogi_get_maxframe(plp, lport->mfs);
+
+ /*
+ * If the rport is one of the well known addresses
+ * we skip PRLI and RTV and go straight to READY.
+ */
+ if (rport->port_id >= FC_FID_DOM_MGR)
+ fc_rport_enter_ready(rport);
+ else
+ fc_rport_enter_prli(rport);
+ } else
+ fc_rport_error(rport, fp);
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&rdata->rp_mutex);
+ put_device(&rport->dev);
+}
+
+/**
+ * fc_rport_enter_plogi - Send Port Login (PLOGI) request to peer
+ * @rport: Fibre Channel remote port to send 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 *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+ struct fc_frame *fp;
+
+ FC_DEBUG_RPORT("Port (%6x) entered PLOGI state from %s state\n",
+ rport->port_id, fc_rport_state(rport));
+
+ fc_rport_state_enter(rport, RPORT_ST_PLOGI);
+
+ rport->maxframe_size = FC_MIN_MAX_PAYLOAD;
+ fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
+ if (!fp) {
+ fc_rport_error(rport, fp);
+ return;
+ }
+ rdata->e_d_tov = lport->e_d_tov;
+
+ if (!lport->tt.elsct_send(lport, rport, fp, ELS_PLOGI,
+ fc_rport_plogi_resp, rport, lport->e_d_tov))
+ fc_rport_error(rport, fp);
+ else
+ get_device(&rport->dev);
+}
+
+/**
+ * fc_rport_prli_resp - Process Login (PRLI) response handler
+ * @sp: current sequence in the PRLI exchange
+ * @fp: response frame
+ * @rp_arg: Fibre Channel remote port
+ *
+ * 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 *rp_arg)
+{
+ struct fc_rport *rport = rp_arg;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct {
+ struct fc_els_prli prli;
+ struct fc_els_spp spp;
+ } *pp;
+ u32 roles = FC_RPORT_ROLE_UNKNOWN;
+ u32 fcp_parm = 0;
+ u8 op;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Received a PRLI response from port (%6x)\n",
+ rport->port_id);
+
+ if (rdata->rp_state != RPORT_ST_PRLI) {
+ FC_DBG("Received a PRLI response, but in state %s\n",
+ fc_rport_state(rport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_rport_error(rport, fp);
+ goto err;
+ }
+
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC) {
+ pp = fc_frame_payload_get(fp, sizeof(*pp));
+ if (pp && pp->prli.prli_spp_len >= sizeof(pp->spp)) {
+ fcp_parm = ntohl(pp->spp.spp_params);
+ if (fcp_parm & FCP_SPPF_RETRY)
+ rdata->flags |= FC_RP_FLAGS_RETRY;
+ }
+
+ rport->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;
+
+ rport->roles = roles;
+ fc_rport_enter_rtv(rport);
+
+ } else {
+ FC_DBG("Bad ELS response\n");
+ rdata->event = RPORT_EV_FAILED;
+ queue_work(rport_event_queue, &rdata->event_work);
+ }
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&rdata->rp_mutex);
+ put_device(&rport->dev);
+}
+
+/**
+ * fc_rport_logo_resp - Logout (LOGO) response handler
+ * @sp: current sequence in the LOGO exchange
+ * @fp: response frame
+ * @rp_arg: Fibre Channel remote port
+ *
+ * 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_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *rp_arg)
+{
+ struct fc_rport *rport = rp_arg;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ u8 op;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Received a LOGO response from port (%6x)\n",
+ rport->port_id);
+
+ if (IS_ERR(fp)) {
+ fc_rport_error(rport, fp);
+ goto err;
+ }
+
+ if (rdata->rp_state != RPORT_ST_LOGO) {
+ FC_DEBUG_RPORT("Received a LOGO response, but in state %s\n",
+ fc_rport_state(rport));
+ goto out;
+ }
+
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC) {
+ fc_rport_enter_rtv(rport);
+ } else {
+ FC_DBG("Bad ELS response\n");
+ rdata->event = RPORT_EV_LOGO;
+ queue_work(rport_event_queue, &rdata->event_work);
+ }
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&rdata->rp_mutex);
+ put_device(&rport->dev);
+}
+
+/**
+ * fc_rport_enter_prli - Send Process Login (PRLI) request to peer
+ * @rport: Fibre Channel remote port to send PRLI to
+ *
+ * Locking Note: The rport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_rport_enter_prli(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+ struct {
+ struct fc_els_prli prli;
+ struct fc_els_spp spp;
+ } *pp;
+ struct fc_frame *fp;
+
+ FC_DEBUG_RPORT("Port (%6x) entered PRLI state from %s state\n",
+ rport->port_id, fc_rport_state(rport));
+
+ fc_rport_state_enter(rport, RPORT_ST_PRLI);
+
+ fp = fc_frame_alloc(lport, sizeof(*pp));
+ if (!fp) {
+ fc_rport_error(rport, fp);
+ return;
+ }
+
+ if (!lport->tt.elsct_send(lport, rport, fp, ELS_PRLI,
+ fc_rport_prli_resp, rport, lport->e_d_tov))
+ fc_rport_error(rport, fp);
+ else
+ get_device(&rport->dev);
+}
+
+/**
+ * fc_rport_els_rtv_resp - Request Timeout Value response handler
+ * @sp: current sequence in the RTV exchange
+ * @fp: response frame
+ * @rp_arg: Fibre Channel remote port
+ *
+ * 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 *rp_arg)
+{
+ struct fc_rport *rport = rp_arg;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ u8 op;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Received a RTV response from port (%6x)\n",
+ rport->port_id);
+
+ if (rdata->rp_state != RPORT_ST_RTV) {
+ FC_DBG("Received a RTV response, but in state %s\n",
+ fc_rport_state(rport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_rport_error(rport, 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(rport);
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&rdata->rp_mutex);
+ put_device(&rport->dev);
+}
+
+/**
+ * fc_rport_enter_rtv - Send Request Timeout Value (RTV) request to peer
+ * @rport: Fibre Channel remote port to send RTV to
+ *
+ * Locking Note: The rport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_rport_enter_rtv(struct fc_rport *rport)
+{
+ struct fc_frame *fp;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+
+ FC_DEBUG_RPORT("Port (%6x) entered RTV state from %s state\n",
+ rport->port_id, fc_rport_state(rport));
+
+ fc_rport_state_enter(rport, RPORT_ST_RTV);
+
+ fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv));
+ if (!fp) {
+ fc_rport_error(rport, fp);
+ return;
+ }
+
+ if (!lport->tt.elsct_send(lport, rport, fp, ELS_RTV,
+ fc_rport_rtv_resp, rport, lport->e_d_tov))
+ fc_rport_error(rport, fp);
+ else
+ get_device(&rport->dev);
+}
+
+/**
+ * fc_rport_enter_logo - Send Logout (LOGO) request to peer
+ * @rport: Fibre Channel remote port to send LOGO to
+ *
+ * Locking Note: The rport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_rport_enter_logo(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+ struct fc_frame *fp;
+
+ FC_DEBUG_RPORT("Port (%6x) entered LOGO state from %s state\n",
+ rport->port_id, fc_rport_state(rport));
+
+ fc_rport_state_enter(rport, RPORT_ST_LOGO);
+
+ fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo));
+ if (!fp) {
+ fc_rport_error(rport, fp);
+ return;
+ }
+
+ if (!lport->tt.elsct_send(lport, rport, fp, ELS_LOGO,
+ fc_rport_logo_resp, rport, lport->e_d_tov))
+ fc_rport_error(rport, fp);
+ else
+ get_device(&rport->dev);
+}
+
+
+/**
+ * fc_rport_recv_req - Receive a request from a rport
+ * @sp: current sequence in the PLOGI exchange
+ * @fp: response frame
+ * @rp_arg: Fibre Channel remote port
+ *
+ * Locking Note: Called without the rport lock held. This
+ * function will hold the rport lock, call an _enter_*
+ * function and then unlock the rport.
+ */
+void fc_rport_recv_req(struct fc_seq *sp, struct fc_frame *fp,
+ struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+
+ struct fc_frame_header *fh;
+ struct fc_seq_els_data els_data;
+ u8 op;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ els_data.fp = NULL;
+ els_data.explan = ELS_EXPL_NONE;
+ els_data.reason = ELS_RJT_NONE;
+
+ fh = fc_frame_header_get(fp);
+
+ if (fh->fh_r_ctl == FC_RCTL_ELS_REQ && fh->fh_type == FC_TYPE_ELS) {
+ op = fc_frame_payload_op(fp);
+ switch (op) {
+ case ELS_PLOGI:
+ fc_rport_recv_plogi_req(rport, sp, fp);
+ break;
+ case ELS_PRLI:
+ fc_rport_recv_prli_req(rport, sp, fp);
+ break;
+ case ELS_PRLO:
+ fc_rport_recv_prlo_req(rport, sp, fp);
+ break;
+ case ELS_LOGO:
+ fc_rport_recv_logo_req(rport, sp, fp);
+ break;
+ case ELS_RRQ:
+ els_data.fp = fp;
+ lport->tt.seq_els_rsp_send(sp, ELS_RRQ, &els_data);
+ break;
+ case ELS_REC:
+ els_data.fp = fp;
+ lport->tt.seq_els_rsp_send(sp, ELS_REC, &els_data);
+ break;
+ default:
+ els_data.reason = ELS_RJT_UNSUP;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &els_data);
+ break;
+ }
+ }
+
+ mutex_unlock(&rdata->rp_mutex);
+}
+
+/**
+ * fc_rport_recv_plogi_req - Handle incoming Port Login (PLOGI) request
+ * @rport: Fibre Channel remote port that initiated PLOGI
+ * @sp: current sequence in the PLOGI exchange
+ * @fp: PLOGI request frame
+ *
+ * Locking Note: The rport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_rport_recv_plogi_req(struct fc_rport *rport,
+ struct fc_seq *sp, struct fc_frame *rx_fp)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+ struct fc_frame *fp = rx_fp;
+ struct fc_exch *ep;
+ struct fc_frame_header *fh;
+ struct fc_els_flogi *pl;
+ struct fc_seq_els_data rjt_data;
+ u32 sid;
+ u64 wwpn;
+ u64 wwnn;
+ enum fc_els_rjt_reason reject = 0;
+ u32 f_ctl;
+ rjt_data.fp = NULL;
+
+ fh = fc_frame_header_get(fp);
+
+ FC_DEBUG_RPORT("Received PLOGI request from port (%6x) "
+ "while in state %s\n", ntoh24(fh->fh_s_id),
+ fc_rport_state(rport));
+
+ sid = ntoh24(fh->fh_s_id);
+ pl = fc_frame_payload_get(fp, sizeof(*pl));
+ if (!pl) {
+ FC_DBG("incoming PLOGI from %x too short\n", sid);
+ WARN_ON(1);
+ /* XXX TBD: send reject? */
+ fc_frame_free(fp);
+ return;
+ }
+ wwpn = get_unaligned_be64(&pl->fl_wwpn);
+ wwnn = get_unaligned_be64(&pl->fl_wwnn);
+
+ /*
+ * If the session 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_DEBUG_RPORT("incoming PLOGI from %6x wwpn %llx state INIT "
+ "- reject\n", sid, wwpn);
+ reject = ELS_RJT_UNSUP;
+ break;
+ case RPORT_ST_PLOGI:
+ FC_DEBUG_RPORT("incoming PLOGI from %x in PLOGI state %d\n",
+ sid, rdata->rp_state);
+ if (wwpn < lport->wwpn)
+ reject = ELS_RJT_INPROG;
+ break;
+ case RPORT_ST_PRLI:
+ case RPORT_ST_READY:
+ FC_DEBUG_RPORT("incoming PLOGI from %x in logged-in state %d "
+ "- ignored for now\n", sid, rdata->rp_state);
+ /* XXX TBD - should reset */
+ break;
+ case RPORT_ST_NONE:
+ default:
+ FC_DEBUG_RPORT("incoming PLOGI from %x in unexpected "
+ "state %d\n", sid, rdata->rp_state);
+ break;
+ }
+
+ if (reject) {
+ rjt_data.reason = reject;
+ rjt_data.explan = ELS_EXPL_NONE;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+ fc_frame_free(fp);
+ } else {
+ fp = fc_frame_alloc(lport, sizeof(*pl));
+ if (fp == NULL) {
+ fp = rx_fp;
+ rjt_data.reason = ELS_RJT_UNAB;
+ rjt_data.explan = ELS_EXPL_NONE;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+ fc_frame_free(fp);
+ } else {
+ sp = lport->tt.seq_start_next(sp);
+ WARN_ON(!sp);
+ fc_rport_set_name(rport, wwpn, wwnn);
+
+ /*
+ * Get session payload size from incoming PLOGI.
+ */
+ rport->maxframe_size =
+ fc_plogi_get_maxframe(pl, lport->mfs);
+ fc_frame_free(rx_fp);
+ fc_plogi_fill(lport, fp, ELS_LS_ACC);
+
+ /*
+ * Send LS_ACC. If this fails,
+ * the originator should retry.
+ */
+ f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
+ f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
+ ep = fc_seq_exch(sp);
+ fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
+ FC_TYPE_ELS, f_ctl, 0);
+ lport->tt.seq_send(lport, sp, fp);
+ if (rdata->rp_state == RPORT_ST_PLOGI)
+ fc_rport_enter_prli(rport);
+ }
+ }
+}
+
+/**
+ * fc_rport_recv_prli_req - Handle incoming Process Login (PRLI) request
+ * @rport: Fibre Channel remote port that initiated PRLI
+ * @sp: current sequence in the PRLI exchange
+ * @fp: PRLI request frame
+ *
+ * Locking Note: The rport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_rport_recv_prli_req(struct fc_rport *rport,
+ struct fc_seq *sp, struct fc_frame *rx_fp)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+ struct fc_exch *ep;
+ struct fc_frame *fp;
+ struct fc_frame_header *fh;
+ 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_rjt_reason reason = ELS_RJT_UNAB;
+ enum fc_els_rjt_explan explan = ELS_EXPL_NONE;
+ enum fc_els_spp_resp resp;
+ struct fc_seq_els_data rjt_data;
+ u32 f_ctl;
+ u32 fcp_parm;
+ u32 roles = FC_RPORT_ROLE_UNKNOWN;
+ rjt_data.fp = NULL;
+
+ fh = fc_frame_header_get(rx_fp);
+
+ FC_DEBUG_RPORT("Received PRLI request from port (%6x) "
+ "while in state %s\n", ntoh24(fh->fh_s_id),
+ fc_rport_state(rport));
+
+ switch (rdata->rp_state) {
+ case RPORT_ST_PRLI:
+ case RPORT_ST_READY:
+ reason = ELS_RJT_NONE;
+ break;
+ default:
+ break;
+ }
+ len = fr_len(rx_fp) - sizeof(*fh);
+ pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
+ if (pp == NULL) {
+ reason = ELS_RJT_PROT;
+ explan = ELS_EXPL_INV_LEN;
+ } else {
+ plen = ntohs(pp->prli.prli_len);
+ if ((plen % 4) != 0 || plen > len) {
+ reason = ELS_RJT_PROT;
+ explan = ELS_EXPL_INV_LEN;
+ } else if (plen < len) {
+ len = plen;
+ }
+ plen = pp->prli.prli_spp_len;
+ if ((plen % 4) != 0 || plen < sizeof(*spp) ||
+ plen > len || len < sizeof(*pp)) {
+ reason = ELS_RJT_PROT;
+ explan = ELS_EXPL_INV_LEN;
+ }
+ rspp = &pp->spp;
+ }
+ if (reason != ELS_RJT_NONE ||
+ (fp = fc_frame_alloc(lport, len)) == NULL) {
+ rjt_data.reason = reason;
+ rjt_data.explan = explan;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+ } else {
+ sp = lport->tt.seq_start_next(sp);
+ WARN_ON(!sp);
+ 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;
+ while (len >= plen) {
+ spp->spp_type = rspp->spp_type;
+ spp->spp_type_ext = rspp->spp_type_ext;
+ spp->spp_flags = rspp->spp_flags & FC_SPP_EST_IMG_PAIR;
+ resp = FC_SPP_RESP_ACK;
+ if (rspp->spp_flags & FC_SPP_RPA_VAL)
+ resp = FC_SPP_RESP_NO_PA;
+ switch (rspp->spp_type) {
+ case 0: /* common to all FC-4 types */
+ break;
+ case FC_TYPE_FCP:
+ fcp_parm = ntohl(rspp->spp_params);
+ if (fcp_parm * FCP_SPPF_RETRY)
+ rdata->flags |= FC_RP_FLAGS_RETRY;
+ rport->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;
+ rport->roles = roles;
+
+ spp->spp_params =
+ htonl(lport->service_params);
+ break;
+ default:
+ resp = FC_SPP_RESP_INVL;
+ break;
+ }
+ spp->spp_flags |= resp;
+ len -= plen;
+ rspp = (struct fc_els_spp *)((char *)rspp + plen);
+ spp = (struct fc_els_spp *)((char *)spp + plen);
+ }
+
+ /*
+ * Send LS_ACC. If this fails, the originator should retry.
+ */
+ f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
+ f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
+ ep = fc_seq_exch(sp);
+ fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
+ FC_TYPE_ELS, f_ctl, 0);
+ lport->tt.seq_send(lport, sp, fp);
+
+ /*
+ * Get lock and re-check state.
+ */
+ switch (rdata->rp_state) {
+ case RPORT_ST_PRLI:
+ fc_rport_enter_ready(rport);
+ break;
+ case RPORT_ST_READY:
+ break;
+ default:
+ break;
+ }
+ }
+ fc_frame_free(rx_fp);
+}
+
+/**
+ * fc_rport_recv_prlo_req - Handle incoming Process Logout (PRLO) request
+ * @rport: Fibre Channel remote port that initiated PRLO
+ * @sp: current sequence in the PRLO exchange
+ * @fp: PRLO request frame
+ *
+ * Locking Note: The rport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_rport_recv_prlo_req(struct fc_rport *rport, struct fc_seq *sp,
+ struct fc_frame *fp)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+
+ struct fc_frame_header *fh;
+ struct fc_seq_els_data rjt_data;
+
+ fh = fc_frame_header_get(fp);
+
+ FC_DEBUG_RPORT("Received PRLO request from port (%6x) "
+ "while in state %s\n", ntoh24(fh->fh_s_id),
+ fc_rport_state(rport));
+
+ rjt_data.fp = NULL;
+ rjt_data.reason = ELS_RJT_UNAB;
+ rjt_data.explan = ELS_EXPL_NONE;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+ fc_frame_free(fp);
+}
+
+/**
+ * fc_rport_recv_logo_req - Handle incoming Logout (LOGO) request
+ * @rport: Fibre Channel remote port that initiated LOGO
+ * @sp: current sequence in the LOGO exchange
+ * @fp: LOGO request frame
+ *
+ * Locking Note: The rport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_rport_recv_logo_req(struct fc_rport *rport, struct fc_seq *sp,
+ struct fc_frame *fp)
+{
+ struct fc_frame_header *fh;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+
+ fh = fc_frame_header_get(fp);
+
+ FC_DEBUG_RPORT("Received LOGO request from port (%6x) "
+ "while in state %s\n", ntoh24(fh->fh_s_id),
+ fc_rport_state(rport));
+
+ rdata->event = RPORT_EV_LOGO;
+ queue_work(rport_event_queue, &rdata->event_work);
+
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
+ fc_frame_free(fp);
+}
+
+static void fc_rport_flush_queue(void)
+{
+ flush_workqueue(rport_event_queue);
+}
+
+
+int fc_rport_init(struct fc_lport *lport)
+{
+ 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;
+
+ return 0;
+}
+EXPORT_SYMBOL(fc_rport_init);
+
+int fc_setup_rport()
+{
+ rport_event_queue = create_singlethread_workqueue("fc_rport_eq");
+ if (!rport_event_queue)
+ return -ENOMEM;
+ return 0;
+}
+EXPORT_SYMBOL(fc_setup_rport);
+
+void fc_destroy_rport()
+{
+ destroy_workqueue(rport_event_queue);
+}
+EXPORT_SYMBOL(fc_destroy_rport);
+
+void fc_rport_terminate_io(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+
+ lport->tt.exch_mgr_reset(lport->emp, 0, rport->port_id);
+ lport->tt.exch_mgr_reset(lport->emp, rport->port_id, 0);
+}
+EXPORT_SYMBOL(fc_rport_terminate_io);
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