[SCSI] lpfc: NPIV: add NPIV support on top of SLI-3

NPIV support is added to the driver.  It utilizes the interfaces of
the fc transport for the creation and deletion of vports. Within the
driver, a new Scsi_Host is created for each NPIV instance, and is
paired with a new instance of a FC port.  This allows N FC Port
elements to share a single Adapter.

Signed-off-by: James Smart <James.Smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 508 insertions, 0 deletions

diff --git a/drivers/scsi/lpfc/lpfc_vport.c b/drivers/scsi/lpfc/lpfc_vport.c
new file mode 100644
index 0000000..786125b
--- /dev/null
+++ b/drivers/scsi/lpfc/lpfc_vport.c
@@ -0,0 +1,508 @@
+/*******************************************************************
+ * This file is part of the Emulex Linux Device Driver for         *
+ * Fibre Channel Host Bus Adapters.                                *
+ * Copyright (C) 2004-2006 Emulex.  All rights reserved.           *
+ * EMULEX and SLI are trademarks of Emulex.                        *
+ * www.emulex.com                                                  *
+ * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
+ *                                                                 *
+ * This program is free software; you can redistribute it and/or   *
+ * modify it under the terms of version 2 of the GNU General       *
+ * Public License as published by the Free Software Foundation.    *
+ * This program is distributed in the hope that it will be useful. *
+ * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
+ * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
+ * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
+ * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
+ * more details, a copy of which can be found in the file COPYING  *
+ * included with this package.                                     *
+ *******************************************************************/
+
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/idr.h>
+#include <linux/interrupt.h>
+#include <linux/kthread.h>
+#include <linux/pci.h>
+#include <linux/spinlock.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_transport_fc.h>
+#include "lpfc_hw.h"
+#include "lpfc_sli.h"
+#include "lpfc_disc.h"
+#include "lpfc_scsi.h"
+#include "lpfc.h"
+#include "lpfc_logmsg.h"
+#include "lpfc_crtn.h"
+#include "lpfc_version.h"
+#include "lpfc_vport.h"
+
+inline void lpfc_vport_set_state(struct lpfc_vport *vport,
+				 enum fc_vport_state new_state)
+{
+	struct fc_vport *fc_vport = vport->fc_vport;
+
+	if (fc_vport) {
+		/*
+		 * When the transport defines fc_vport_set state we will replace
+		 * this code with the following line
+		 */
+		/* fc_vport_set_state(fc_vport, new_state); */
+		if (new_state != FC_VPORT_INITIALIZING)
+			fc_vport->vport_last_state = fc_vport->vport_state;
+		fc_vport->vport_state = new_state;
+	}
+
+	/* for all the error states we will set the invternal state to FAILED */
+	switch (new_state) {
+	case FC_VPORT_NO_FABRIC_SUPP:
+	case FC_VPORT_NO_FABRIC_RSCS:
+	case FC_VPORT_FABRIC_LOGOUT:
+	case FC_VPORT_FABRIC_REJ_WWN:
+	case FC_VPORT_FAILED:
+		vport->port_state = LPFC_VPORT_FAILED;
+		break;
+	case FC_VPORT_LINKDOWN:
+		vport->port_state = LPFC_VPORT_UNKNOWN;
+		break;
+	default:
+		/* do nothing */
+		break;
+	}
+}
+
+static int
+lpfc_alloc_vpi(struct lpfc_hba *phba)
+{
+	int  vpi;
+
+	spin_lock_irq(&phba->hbalock);
+	vpi = find_next_zero_bit(phba->vpi_bmask, phba->max_vpi, 1);
+	if (vpi > phba->max_vpi)
+		vpi = 0;
+	else
+		set_bit(vpi, phba->vpi_bmask);
+	spin_unlock_irq(&phba->hbalock);
+	return vpi;
+}
+
+static void
+lpfc_free_vpi(struct lpfc_hba *phba, int vpi)
+{
+	spin_lock_irq(&phba->hbalock);
+	clear_bit(vpi, phba->vpi_bmask);
+	spin_unlock_irq(&phba->hbalock);
+}
+
+static int
+lpfc_vport_sparm(struct lpfc_hba *phba, struct lpfc_vport *vport)
+{
+	LPFC_MBOXQ_t *pmb;
+	MAILBOX_t *mb;
+	struct lpfc_dmabuf *mp;
+	int  rc;
+
+	pmb = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
+	if (!pmb) {
+		return -ENOMEM;
+	}
+	mb = &pmb->mb;
+
+	lpfc_read_sparam(phba, pmb, vport->vpi);
+	/*
+	 * Grab buffer pointer and clear context1 so we can use
+	 * lpfc_sli_issue_box_wait
+	 */
+	mp = (struct lpfc_dmabuf *) pmb->context1;
+	pmb->context1 = NULL;
+
+	pmb->vport = vport;
+	rc = lpfc_sli_issue_mbox_wait(phba, pmb, phba->fc_ratov * 2);
+	if (rc != MBX_SUCCESS) {
+		lpfc_printf_log(phba, KERN_ERR, LOG_INIT | LOG_VPORT,
+				"%d (%d):1818 VPort failed init, mbxCmd x%x "
+				"READ_SPARM mbxStatus x%x, rc = x%x\n",
+				phba->brd_no, vport->vpi,
+				mb->mbxCommand, mb->mbxStatus, rc);
+		lpfc_mbuf_free(phba, mp->virt, mp->phys);
+		kfree(mp);
+		mempool_free(pmb, phba->mbox_mem_pool);
+		return -EIO;
+	}
+
+	memcpy(&vport->fc_sparam, mp->virt, sizeof (struct serv_parm));
+	memcpy(&vport->fc_nodename, &vport->fc_sparam.nodeName,
+	       sizeof (struct lpfc_name));
+	memcpy(&vport->fc_portname, &vport->fc_sparam.portName,
+	       sizeof (struct lpfc_name));
+
+	lpfc_mbuf_free(phba, mp->virt, mp->phys);
+	kfree(mp);
+	mempool_free(pmb, phba->mbox_mem_pool);
+
+	return 0;
+}
+
+static int
+lpfc_valid_wwn_format(struct lpfc_hba *phba, struct lpfc_name *wwn,
+		      const char *name_type)
+{
+				/* ensure that IEEE format 1 addresses
+				 * contain zeros in bits 59-48
+				 */
+	if (!((wwn->u.wwn[0] >> 4) == 1 &&
+	      ((wwn->u.wwn[0] & 0xf) != 0 || (wwn->u.wwn[1] & 0xf) != 0)))
+		return 1;
+
+	lpfc_printf_log(phba, KERN_ERR, LOG_VPORT,
+			"%d:1822 Invalid %s: %02x:%02x:%02x:%02x:"
+			"%02x:%02x:%02x:%02x\n",
+			phba->brd_no, name_type,
+			wwn->u.wwn[0], wwn->u.wwn[1],
+			wwn->u.wwn[2], wwn->u.wwn[3],
+			wwn->u.wwn[4], wwn->u.wwn[5],
+			wwn->u.wwn[6], wwn->u.wwn[7]);
+	return 0;
+}
+
+static int
+lpfc_unique_wwpn(struct lpfc_hba *phba, struct lpfc_vport *new_vport)
+{
+	struct lpfc_vport *vport;
+
+	list_for_each_entry(vport, &phba->port_list, listentry) {
+		if (vport == new_vport)
+			continue;
+		/* If they match, return not unique */
+		if (memcmp(&vport->fc_sparam.portName,
+			&new_vport->fc_sparam.portName,
+			sizeof(struct lpfc_name)) == 0)
+			return 0;
+	}
+	return 1;
+}
+
+int
+lpfc_vport_create(struct fc_vport *fc_vport, bool disable)
+{
+	struct lpfc_nodelist *ndlp;
+	struct lpfc_vport *pport =
+		(struct lpfc_vport *) fc_vport->shost->hostdata;
+	struct lpfc_hba   *phba = pport->phba;
+	struct lpfc_vport *vport = NULL;
+	int instance;
+	int vpi;
+	int rc = VPORT_ERROR;
+
+	if ((phba->sli_rev < 3) ||
+		!(phba->sli3_options & LPFC_SLI3_NPIV_ENABLED)) {
+		lpfc_printf_log(phba, KERN_ERR, LOG_VPORT,
+				"%d:1808 Create VPORT failed: "
+				"NPIV is not enabled: SLImode:%d\n",
+				phba->brd_no, phba->sli_rev);
+		rc = VPORT_INVAL;
+		goto error_out;
+	}
+
+	vpi = lpfc_alloc_vpi(phba);
+	if (vpi == 0) {
+		lpfc_printf_log(phba, KERN_ERR, LOG_VPORT,
+				"%d:1809 Create VPORT failed: "
+				"Max VPORTs (%d) exceeded\n",
+				phba->brd_no, phba->max_vpi);
+		rc = VPORT_NORESOURCES;
+		goto error_out;
+	}
+
+
+	/* Assign an unused board number */
+	if ((instance = lpfc_get_instance()) < 0) {
+		lpfc_printf_log(phba, KERN_ERR, LOG_VPORT,
+				"%d:1810 Create VPORT failed: Cannot get "
+				"instance number\n", phba->brd_no);
+		lpfc_free_vpi(phba, vpi);
+		rc = VPORT_NORESOURCES;
+		goto error_out;
+	}
+
+	vport = lpfc_create_port(phba, instance, fc_vport);
+	if (!vport) {
+		lpfc_printf_log(phba, KERN_ERR, LOG_VPORT,
+				"%d:1811 Create VPORT failed: vpi x%x\n",
+				phba->brd_no, vpi);
+		lpfc_free_vpi(phba, vpi);
+		rc = VPORT_NORESOURCES;
+		goto error_out;
+	}
+
+	vport->vpi = vpi;
+	if (lpfc_vport_sparm(phba, vport)) {
+		lpfc_printf_log(phba, KERN_ERR, LOG_VPORT,
+				"%d:1813 Create VPORT failed: vpi:%d "
+				"Cannot get sparam\n",
+				phba->brd_no, vpi);
+		lpfc_free_vpi(phba, vpi);
+		destroy_port(vport);
+		rc = VPORT_NORESOURCES;
+		goto error_out;
+	}
+
+	memcpy(vport->fc_portname.u.wwn, vport->fc_sparam.portName.u.wwn, 8);
+	memcpy(vport->fc_nodename.u.wwn, vport->fc_sparam.nodeName.u.wwn, 8);
+
+	if (fc_vport->node_name != 0)
+		u64_to_wwn(fc_vport->node_name, vport->fc_nodename.u.wwn);
+	if (fc_vport->port_name != 0)
+		u64_to_wwn(fc_vport->port_name, vport->fc_portname.u.wwn);
+
+	memcpy(&vport->fc_sparam.portName, vport->fc_portname.u.wwn, 8);
+	memcpy(&vport->fc_sparam.nodeName, vport->fc_nodename.u.wwn, 8);
+
+	if (!lpfc_valid_wwn_format(phba, &vport->fc_sparam.nodeName, "WWNN") ||
+	    !lpfc_valid_wwn_format(phba, &vport->fc_sparam.portName, "WWPN")) {
+		lpfc_printf_log(phba, KERN_ERR, LOG_VPORT,
+				"%d:1821 Create VPORT failed: vpi:%d "
+				"Invalid WWN format\n",
+				phba->brd_no, vpi);
+		lpfc_free_vpi(phba, vpi);
+		destroy_port(vport);
+		rc = VPORT_INVAL;
+		goto error_out;
+	}
+
+	if (!lpfc_unique_wwpn(phba, vport)) {
+		lpfc_printf_log(phba, KERN_ERR, LOG_VPORT,
+				"%d:1823 Create VPORT failed: vpi:%d "
+				"Duplicate WWN on HBA\n",
+				phba->brd_no, vpi);
+		lpfc_free_vpi(phba, vpi);
+		destroy_port(vport);
+		rc = VPORT_INVAL;
+		goto error_out;
+	}
+
+	*(struct lpfc_vport **)fc_vport->dd_data = vport;
+	vport->fc_vport = fc_vport;
+
+	if ((phba->link_state < LPFC_LINK_UP) ||
+	    (phba->fc_topology == TOPOLOGY_LOOP)) {
+		lpfc_vport_set_state(vport, FC_VPORT_LINKDOWN);
+		rc = VPORT_OK;
+		goto out;
+	}
+
+	if (disable) {
+		rc = VPORT_OK;
+		goto out;
+	}
+
+	/* Use the Physical nodes Fabric NDLP to determine if the link is
+	 * up and ready to FDISC.
+	 */
+	ndlp = lpfc_findnode_did(phba->pport, Fabric_DID);
+	if (ndlp && ndlp->nlp_state == NLP_STE_UNMAPPED_NODE) {
+		lpfc_set_disctmo(vport);
+		lpfc_initial_fdisc(vport);
+	} else {
+		lpfc_vport_set_state(vport, FC_VPORT_FAILED);
+	}
+	rc = VPORT_OK;
+
+out:
+	lpfc_host_attrib_init(lpfc_shost_from_vport(vport));
+error_out:
+	return rc;
+}
+
+int
+disable_vport(struct fc_vport *fc_vport)
+{
+	struct lpfc_vport *vport = *(struct lpfc_vport **)fc_vport->dd_data;
+	struct lpfc_hba   *phba = vport->phba;
+	struct lpfc_nodelist *ndlp = NULL, *next_ndlp = NULL;
+	long timeout;
+
+	ndlp = lpfc_findnode_did(vport, Fabric_DID);
+	if (ndlp && phba->link_state >= LPFC_LINK_UP) {
+		vport->unreg_vpi_cmpl = VPORT_INVAL;
+		timeout = msecs_to_jiffies(phba->fc_ratov * 2000);
+		if (!lpfc_issue_els_npiv_logo(vport, ndlp))
+			while (vport->unreg_vpi_cmpl == VPORT_INVAL && timeout)
+				timeout = schedule_timeout(timeout);
+	}
+
+	lpfc_sli_host_down(vport);
+
+	/* Mark all nodes for discovery so we can remove them by
+	 * calling lpfc_cleanup_rpis(vport, 1)
+	 */
+	list_for_each_entry_safe(ndlp, next_ndlp, &vport->fc_nodes, nlp_listp) {
+		if (ndlp->nlp_state == NLP_STE_UNUSED_NODE)
+			continue;
+		lpfc_disc_state_machine(vport, ndlp, NULL,
+					NLP_EVT_DEVICE_RECOVERY);
+	}
+	lpfc_cleanup_rpis(vport, 1);
+
+	lpfc_stop_vport_timers(vport);
+	lpfc_unreg_all_rpis(vport);
+	lpfc_unreg_default_rpis(vport);
+	/*
+	 * Completion of unreg_vpi (lpfc_mbx_cmpl_unreg_vpi) does the
+	 * scsi_host_put() to release the vport.
+	 */
+	lpfc_mbx_unreg_vpi(vport);
+
+	lpfc_vport_set_state(vport, FC_VPORT_DISABLED);
+	return VPORT_OK;
+}
+
+int
+enable_vport(struct fc_vport *fc_vport)
+{
+	struct lpfc_vport *vport = *(struct lpfc_vport **)fc_vport->dd_data;
+	struct lpfc_hba   *phba = vport->phba;
+	struct lpfc_nodelist *ndlp = NULL;
+
+	if ((phba->link_state < LPFC_LINK_UP) ||
+	    (phba->fc_topology == TOPOLOGY_LOOP)) {
+		lpfc_vport_set_state(vport, FC_VPORT_LINKDOWN);
+		return VPORT_OK;
+	}
+
+	vport->load_flag |= FC_LOADING;
+	vport->fc_flag |= FC_VPORT_NEEDS_REG_VPI;
+
+	/* Use the Physical nodes Fabric NDLP to determine if the link is
+	 * up and ready to FDISC.
+	 */
+	ndlp = lpfc_findnode_did(phba->pport, Fabric_DID);
+	if (ndlp && ndlp->nlp_state == NLP_STE_UNMAPPED_NODE) {
+		lpfc_set_disctmo(vport);
+		lpfc_initial_fdisc(vport);
+	} else {
+		lpfc_vport_set_state(vport, FC_VPORT_FAILED);
+	}
+
+	return VPORT_OK;
+}
+
+int
+lpfc_vport_disable(struct fc_vport *fc_vport, bool disable)
+{
+	if (disable)
+		return disable_vport(fc_vport);
+	else
+		return enable_vport(fc_vport);
+}
+
+
+int
+lpfc_vport_delete(struct fc_vport *fc_vport)
+{
+	struct lpfc_nodelist *ndlp = NULL;
+	struct lpfc_nodelist *next_ndlp;
+	struct Scsi_Host *shost = (struct Scsi_Host *) fc_vport->shost;
+	struct lpfc_vport *vport = *(struct lpfc_vport **)fc_vport->dd_data;
+	struct lpfc_hba   *phba = vport->phba;
+	long timeout;
+	int rc = VPORT_ERROR;
+
+	/*
+	 * This is a bit of a mess.  We want to ensure the shost doesn't get
+	 * torn down until we're done with the embedded lpfc_vport structure.
+	 *
+	 * Beyond holding a reference for this function, we also need a
+	 * reference for outstanding I/O requests we schedule during delete
+	 * processing.  But once we scsi_remove_host() we can no longer obtain
+	 * a reference through scsi_host_get().
+	 *
+	 * So we take two references here.  We release one reference at the
+	 * bottom of the function -- after delinking the vport.  And we
+	 * release the other at the completion of the unreg_vpi that get's
+	 * initiated after we've disposed of all other resources associated
+	 * with the port.
+	 */
+	if (!scsi_host_get(shost) || !scsi_host_get(shost))
+		return VPORT_INVAL;
+
+	if (vport->port_type == LPFC_PHYSICAL_PORT) {
+		lpfc_printf_log(phba, KERN_ERR, LOG_VPORT,
+				"%d:1812 vport_delete failed: Cannot delete "
+				"physical host\n", phba->brd_no);
+		goto out;
+	}
+
+	vport->load_flag |= FC_UNLOADING;
+
+	kfree(vport->vname);
+	fc_remove_host(lpfc_shost_from_vport(vport));
+	scsi_remove_host(lpfc_shost_from_vport(vport));
+
+	ndlp = lpfc_findnode_did(phba->pport, Fabric_DID);
+	if (ndlp && ndlp->nlp_state == NLP_STE_UNMAPPED_NODE &&
+		phba->link_state >= LPFC_LINK_UP) {
+
+		/* First look for the Fabric ndlp */
+		ndlp = lpfc_findnode_did(vport, Fabric_DID);
+		if (!ndlp) {
+			/* Cannot find existing Fabric ndlp, allocate one */
+			ndlp = mempool_alloc(phba->nlp_mem_pool, GFP_KERNEL);
+			if (!ndlp)
+				goto skip_logo;
+			lpfc_nlp_init(vport, ndlp, Fabric_DID);
+		} else {
+			lpfc_dequeue_node(vport, ndlp);
+		}
+		vport->unreg_vpi_cmpl = VPORT_INVAL;
+		timeout = msecs_to_jiffies(phba->fc_ratov * 2000);
+		if (!lpfc_issue_els_npiv_logo(vport, ndlp))
+			while (vport->unreg_vpi_cmpl == VPORT_INVAL && timeout)
+				timeout = schedule_timeout(timeout);
+	}
+
+skip_logo:
+	lpfc_sli_host_down(vport);
+
+	list_for_each_entry_safe(ndlp, next_ndlp, &vport->fc_nodes, nlp_listp) {
+		lpfc_disc_state_machine(vport, ndlp, NULL,
+					     NLP_EVT_DEVICE_RECOVERY);
+		lpfc_disc_state_machine(vport, ndlp, NULL,
+					     NLP_EVT_DEVICE_RM);
+	}
+
+	list_for_each_entry_safe(ndlp, next_ndlp, &vport->fc_nodes, nlp_listp) {
+		/* free any ndlp's in unused state */
+		if (ndlp->nlp_state == NLP_STE_UNUSED_NODE)
+			lpfc_drop_node(vport, ndlp);
+	}
+
+	lpfc_stop_vport_timers(vport);
+	lpfc_unreg_all_rpis(vport);
+	lpfc_unreg_default_rpis(vport);
+	/*
+	 * Completion of unreg_vpi (lpfc_mbx_cmpl_unreg_vpi) does the
+	 * scsi_host_put() to release the vport.
+	 */
+	lpfc_mbx_unreg_vpi(vport);
+
+	lpfc_free_vpi(phba, vport->vpi);
+	vport->work_port_events = 0;
+	spin_lock_irq(&phba->hbalock);
+	list_del_init(&vport->listentry);
+	spin_unlock_irq(&phba->hbalock);
+
+	rc = VPORT_OK;
+out:
+	scsi_host_put(shost);
+	return rc;
+}
+
+
+EXPORT_SYMBOL(lpfc_vport_create);
+EXPORT_SYMBOL(lpfc_vport_delete);