[SCSI] fcoe: interface changes to fcoe_if_create and fcoe_if_destroy

By passing in the parent device instead of assuming the netdev is what
should be used, fcoe_if_create becomes usable for NPIV vports as well.
You still need a netdev, because that's how FCoE works.  Also removed some
duplicate checks from fcoe_if_create that are already in fcoe_create.

fcoe_if_destroy needs to take an lport as it's only argument, not a netdev.
That removes the 1:1 netdev:lport assumption from the destroy path.

Signed-off-by: Chris Leech <christopher.leech@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
index e481882..7492796 100644 (file)
--- a/drivers/scsi/fcoe/fcoe.c
+++ b/drivers/scsi/fcoe/fcoe.c
@@ -1,5 +1,5 @@
 /*
- * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
+ * Copyright(c) 2007 - 2009 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,
@@ -506,30 +506,20 @@ skip_oem:
 
 /**
  * fcoe_if_destroy() - FCoE software HBA tear-down function
- * @netdev: ptr to the associated net_device
- *
- * Returns: 0 if link is OK for use by FCoE.
+ * @lport: fc_lport to destroy
  */
-static int fcoe_if_destroy(struct net_device *netdev)
+static void fcoe_if_destroy(struct fc_lport *lport)
 {
-       struct fc_lport *lp = NULL;
-       struct fcoe_softc *fc;
-
-       BUG_ON(!netdev);
+       struct fcoe_softc *fc = lport_priv(lport);
+       struct net_device *netdev = fc->netdev;
 
        FCOE_NETDEV_DBG(netdev, "Destroying interface\n");
 
-       lp = fcoe_hostlist_lookup(netdev);
-       if (!lp)
-               return -ENODEV;
-
-       fc = lport_priv(lp);
-
        /* Logout of the fabric */
-       fc_fabric_logoff(lp);
+       fc_fabric_logoff(lport);
 
        /* Remove the instance from fcoe's list */
-       fcoe_hostlist_remove(lp);
+       fcoe_hostlist_remove(lport);
 
        /* clean up netdev configurations */
        fcoe_netdev_cleanup(fc);
@@ -538,33 +528,31 @@ static int fcoe_if_destroy(struct net_device *netdev)
        fcoe_ctlr_destroy(&fc->ctlr);
 
        /* Free queued packets for the per-CPU receive threads */
-       fcoe_percpu_clean(lp);
+       fcoe_percpu_clean(lport);
 
        /* Cleanup the fc_lport */
-       fc_lport_destroy(lp);
-       fc_fcp_destroy(lp);
+       fc_lport_destroy(lport);
+       fc_fcp_destroy(lport);
 
        /* Detach from the scsi-ml */
-       fc_remove_host(lp->host);
-       scsi_remove_host(lp->host);
+       fc_remove_host(lport->host);
+       scsi_remove_host(lport->host);
 
        /* There are no more rports or I/O, free the EM */
-       fc_exch_mgr_free(lp);
+       fc_exch_mgr_free(lport);
 
        /* Free existing skbs */
-       fcoe_clean_pending_queue(lp);
+       fcoe_clean_pending_queue(lport);
 
        /* Stop the timer */
        del_timer_sync(&fc->timer);
 
        /* Free memory used by statistical counters */
-       fc_lport_free_stats(lp);
+       fc_lport_free_stats(lport);
 
        /* Release the net_device and Scsi_Host */
        dev_put(netdev);
-       scsi_host_put(lp->host);
-
-       return 0;
+       scsi_host_put(lport->host);
 }
 
 /*
@@ -612,38 +600,35 @@ static struct libfc_function_template fcoe_libfc_fcn_templ = {
 /**
  * fcoe_if_create() - this function creates the fcoe interface
  * @netdev: pointer the associated netdevice
+ * @parent: device pointer to be the parent in sysfs for the SCSI host
  *
  * Creates fc_lport struct and scsi_host for lport, configures lport
  * and starts fabric login.
  *
- * Returns : 0 on success
+ * Returns : The allocated fc_lport or an error pointer
  */
-static int fcoe_if_create(struct net_device *netdev)
+static struct fc_lport *fcoe_if_create(struct net_device *netdev,
+                                      struct device *parent)
 {
        int rc;
-       struct fc_lport *lp = NULL;
+       struct fc_lport *lport = NULL;
        struct fcoe_softc *fc;
        struct Scsi_Host *shost;
 
-       BUG_ON(!netdev);
-
        FCOE_NETDEV_DBG(netdev, "Create Interface\n");
 
-       lp = fcoe_hostlist_lookup(netdev);
-       if (lp)
-               return -EEXIST;
-
        shost = libfc_host_alloc(&fcoe_shost_template,
                                 sizeof(struct fcoe_softc));
        if (!shost) {
                FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n");
-               return -ENOMEM;
+               rc = -ENOMEM;
+               goto out;
        }
-       lp = shost_priv(shost);
-       fc = lport_priv(lp);
+       lport = shost_priv(shost);
+       fc = lport_priv(lport);
 
        /* configure fc_lport, e.g., em */
-       rc = fcoe_lport_config(lp);
+       rc = fcoe_lport_config(lport);
        if (rc) {
                FCOE_NETDEV_DBG(netdev, "Could not configure lport for the "
                                "interface\n");
@@ -658,7 +643,7 @@ static int fcoe_if_create(struct net_device *netdev)
        fc->ctlr.update_mac = fcoe_update_src_mac;
 
        /* configure lport network properties */
-       rc = fcoe_netdev_config(lp, netdev);
+       rc = fcoe_netdev_config(lport, netdev);
        if (rc) {
                FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the "
                                "interface\n");
@@ -666,7 +651,7 @@ static int fcoe_if_create(struct net_device *netdev)
        }
 
        /* configure lport scsi host properties */
-       rc = fcoe_shost_config(lp, shost, &netdev->dev);
+       rc = fcoe_shost_config(lport, shost, parent);
        if (rc) {
                FCOE_NETDEV_DBG(netdev, "Could not configure shost for the "
                                "interface\n");
@@ -674,7 +659,7 @@ static int fcoe_if_create(struct net_device *netdev)
        }
 
        /* Initialize the library */
-       rc = fcoe_libfc_config(lp, &fcoe_libfc_fcn_templ);
+       rc = fcoe_libfc_config(lport, &fcoe_libfc_fcn_templ);
        if (rc) {
                FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the "
                                "interface\n");
@@ -689,7 +674,7 @@ static int fcoe_if_create(struct net_device *netdev)
         */
        write_lock(&fcoe_hostlist_lock);
        /* lport exch manager allocation */
-       rc = fcoe_em_config(lp);
+       rc = fcoe_em_config(lport);
        if (rc) {
                FCOE_NETDEV_DBG(netdev, "Could not configure the EM for the "
                                "interface\n");
@@ -697,27 +682,28 @@ static int fcoe_if_create(struct net_device *netdev)
        }
 
        /* add to lports list */
-       fcoe_hostlist_add(lp);
+       fcoe_hostlist_add(lport);
        write_unlock(&fcoe_hostlist_lock);
 
-       lp->boot_time = jiffies;
+       lport->boot_time = jiffies;
 
-       fc_fabric_login(lp);
+       fc_fabric_login(lport);
 
-       if (!fcoe_link_ok(lp))
+       if (!fcoe_link_ok(lport))
                fcoe_ctlr_link_up(&fc->ctlr);
 
        dev_hold(netdev);
 
-       return rc;
+       return lport;
 
 out_lp_destroy:
-       fc_exch_mgr_free(lp);
+       fc_exch_mgr_free(lport);
 out_netdev_cleanup:
        fcoe_netdev_cleanup(fc);
 out_host_put:
-       scsi_host_put(lp->host);
-       return rc;
+       scsi_host_put(lport->host);
+out:
+       return ERR_PTR(rc);
 }
 
 /**
@@ -1616,8 +1602,9 @@ static int fcoe_ethdrv_put(const struct net_device *netdev)
  */
 static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
 {
-       int rc;
        struct net_device *netdev;
+       struct fc_lport *lport;
+       int rc;
 
        netdev = fcoe_if_to_netdev(buffer);
        if (!netdev) {
@@ -1625,17 +1612,12 @@ static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
                goto out_nodev;
        }
        /* look for existing lport */
-       if (!fcoe_hostlist_lookup(netdev)) {
+       lport = fcoe_hostlist_lookup(netdev);
+       if (!lport) {
                rc = -ENODEV;
                goto out_putdev;
        }
-       rc = fcoe_if_destroy(netdev);
-       if (rc) {
-               printk(KERN_ERR "fcoe: Failed to destroy interface (%s)\n",
-                      netdev->name);
-               rc = -EIO;
-               goto out_putdev;
-       }
+       fcoe_if_destroy(lport);
        fcoe_ethdrv_put(netdev);
        rc = 0;
 out_putdev:
@@ -1654,6 +1636,7 @@ out_nodev:
 static int fcoe_create(const char *buffer, struct kernel_param *kp)
 {
        int rc;
+       struct fc_lport *lport;
        struct net_device *netdev;
 
        netdev = fcoe_if_to_netdev(buffer);
@@ -1668,8 +1651,8 @@ static int fcoe_create(const char *buffer, struct kernel_param *kp)
        }
        fcoe_ethdrv_get(netdev);
 
-       rc = fcoe_if_create(netdev);
-       if (rc) {
+       lport = fcoe_if_create(netdev, &netdev->dev);
+       if (IS_ERR(lport)) {
                printk(KERN_ERR "fcoe: Failed to create interface (%s)\n",
                       netdev->name);
                fcoe_ethdrv_put(netdev);
@@ -1926,7 +1909,7 @@ static void __exit fcoe_exit(void)
 
        /* releases the associated fcoe hosts */
        list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list)
-               fcoe_if_destroy(fc->netdev);
+               fcoe_if_destroy(fc->ctlr.lp);
 
        unregister_hotcpu_notifier(&fcoe_cpu_notifier);