[SCSI] qla2xxx: add support for NPIV

Following patch adds support for NPIV (N-Port ID Virtualization) to the
qla2xxx.

- supported within switched-fabric topologies only.
- supports up to 63 virtual ports on each physical port.

Signed-off-by: Seokmann Ju <seokmann.ju@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 497 insertions, 0 deletions

diff --git a/drivers/scsi/qla2xxx/qla_mid.c b/drivers/scsi/qla2xxx/qla_mid.c
new file mode 100644
index 000000000000..54dc415d8b53
--- /dev/null
+++ b/drivers/scsi/qla2xxx/qla_mid.c
@@ -0,0 +1,497 @@
+/*
+ *                  QLOGIC LINUX SOFTWARE
+ *
+ * QLogic ISP2x00 device driver for Linux 2.6.x
+ * Copyright (C) 2003-2005 QLogic Corporation
+ * (www.qlogic.com)
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that 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.
+ *
+ */
+#include "qla_def.h"
+
+#include <linux/version.h>
+#include <linux/moduleparam.h>
+#include <linux/vmalloc.h>
+#include <linux/smp_lock.h>
+#include <linux/list.h>
+
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsicam.h>
+#include <linux/delay.h>
+
+void qla2x00_vp_stop_timer(scsi_qla_host_t *);
+
+void
+qla2x00_vp_stop_timer(scsi_qla_host_t *vha)
+{
+        if (vha->parent && vha->timer_active) {
+                del_timer_sync(&vha->timer);
+                vha->timer_active = 0;
+        }
+}
+
+uint32_t
+qla24xx_allocate_vp_id(scsi_qla_host_t *vha)
+{
+        uint32_t vp_id;
+        scsi_qla_host_t *ha = vha->parent;
+
+        /* Find an empty slot and assign an vp_id */
+        down(&ha->vport_sem);
+        vp_id = find_first_zero_bit((unsigned long *)ha->vp_idx_map,
+                                MAX_MULTI_ID_FABRIC);
+        if (vp_id > MAX_MULTI_ID_FABRIC) {
+                DEBUG15(printk ("vp_id %d is bigger than MAX_MULTI_ID_FABRID\n",
+                    vp_id));
+                up(&ha->vport_sem);
+                return vp_id;
+        }
+
+        set_bit(vp_id, (unsigned long *)ha->vp_idx_map);
+        ha->num_vhosts++;
+        vha->vp_idx = vp_id;
+        list_add_tail(&vha->vp_list, &ha->vp_list);
+        up(&ha->vport_sem);
+        return vp_id;
+}
+
+void
+qla24xx_deallocate_vp_id(scsi_qla_host_t *vha)
+{
+        uint16_t vp_id;
+        scsi_qla_host_t *ha = vha->parent;
+
+        down(&ha->vport_sem);
+        vp_id = vha->vp_idx;
+        ha->num_vhosts--;
+        clear_bit(vp_id, (unsigned long *)ha->vp_idx_map);
+        list_del(&vha->vp_list);
+        up(&ha->vport_sem);
+}
+
+scsi_qla_host_t *
+qla24xx_find_vhost_by_name(scsi_qla_host_t *ha, uint8_t *port_name)
+{
+        scsi_qla_host_t *vha;
+
+        /* Locate matching device in database. */
+        list_for_each_entry(vha, &ha->vp_list, vp_list) {
+                if (!memcmp(port_name, vha->port_name, WWN_SIZE))
+                        return vha;
+        }
+        return NULL;
+}
+
+/*
+ * qla2x00_mark_vp_devices_dead
+ *      Updates fcport state when device goes offline.
+ *
+ * Input:
+ *      ha = adapter block pointer.
+ *      fcport = port structure pointer.
+ *
+ * Return:
+ *      None.
+ *
+ * Context:
+ */
+void
+qla2x00_mark_vp_devices_dead(scsi_qla_host_t *vha)
+{
+        fc_port_t *fcport;
+        scsi_qla_host_t *pha = to_qla_parent(vha);
+
+        list_for_each_entry(fcport, &pha->fcports, list) {
+                if (fcport->vp_idx != vha->vp_idx)
+                        continue;
+
+                DEBUG15(printk("scsi(%ld): Marking port dead, "
+                    "loop_id=0x%04x :%x\n",
+                    vha->host_no, fcport->loop_id, fcport->vp_idx));
+
+                atomic_set(&fcport->state, FCS_DEVICE_DEAD);
+                qla2x00_mark_device_lost(vha, fcport, 0, 0);
+        }
+}
+
+int
+qla24xx_disable_vp(scsi_qla_host_t *vha)
+{
+        int ret;
+
+        ret = qla24xx_control_vp(vha, VCE_COMMAND_DISABLE_VPS_LOGO_ALL);
+        atomic_set(&vha->loop_state, LOOP_DOWN);
+        atomic_set(&vha->loop_down_timer, LOOP_DOWN_TIME);
+
+        /* Delete all vp's fcports from parent's list */
+        qla2x00_mark_vp_devices_dead(vha);
+        atomic_set(&vha->vp_state, VP_FAILED);
+        vha->flags.management_server_logged_in = 0;
+        if (ret == QLA_SUCCESS) {
+                fc_vport_set_state(vha->fc_vport, FC_VPORT_DISABLED);
+        } else {
+                fc_vport_set_state(vha->fc_vport, FC_VPORT_FAILED);
+                return -1;
+        }
+        return 0;
+}
+
+int
+qla24xx_enable_vp(scsi_qla_host_t *vha)
+{
+        int ret;
+        scsi_qla_host_t *ha = vha->parent;
+
+        /* Check if physical ha port is Up */
+        if (atomic_read(&ha->loop_state) == LOOP_DOWN  ||
+                atomic_read(&ha->loop_state) == LOOP_DEAD ) {
+                vha->vp_err_state =  VP_ERR_PORTDWN;
+                fc_vport_set_state(vha->fc_vport, FC_VPORT_LINKDOWN);
+                goto enable_failed;
+        }
+
+        /* Initialize the new vport unless it is a persistent port */
+        down(&ha->vport_sem);
+        ret = qla24xx_modify_vp_config(vha);
+        up(&ha->vport_sem);
+
+        if (ret != QLA_SUCCESS) {
+                fc_vport_set_state(vha->fc_vport, FC_VPORT_FAILED);
+                goto enable_failed;
+        }
+
+        DEBUG15(qla_printk(KERN_INFO, ha,
+            "Virtual port with id: %d - Enabled\n", vha->vp_idx));
+        return 0;
+
+enable_failed:
+        DEBUG15(qla_printk(KERN_INFO, ha,
+            "Virtual port with id: %d - Disabled\n", vha->vp_idx));
+        return 1;
+}
+
+/**
+ * qla24xx_modify_vport() -  Modifies the virtual fabric port's configuration
+ * @ha: HA context
+ * @vp: pointer to buffer of virtual port parameters.
+ * @ret_code: return error code:
+ *
+ * Returns the virtual port id, or MAX_VSAN_ID, if couldn't create.
+ */
+uint32_t
+qla24xx_modify_vhba(scsi_qla_host_t *ha, vport_params_t *vp, uint32_t *vp_id)
+{
+        scsi_qla_host_t *vha;
+
+        vha = qla24xx_find_vhost_by_name(ha, vp->port_name);
+        if (!vha) {
+                *vp_id = MAX_NUM_VPORT_LOOP;
+                return VP_RET_CODE_WWPN;
+        }
+
+        if (qla24xx_enable_vp(vha)) {
+                scsi_host_put(vha->host);
+                qla2x00_mem_free(vha);
+                *vp_id = MAX_NUM_VPORT_LOOP;
+                return VP_RET_CODE_RESOURCES;
+        }
+
+        *vp_id = vha->vp_idx;
+        return VP_RET_CODE_OK;
+}
+
+void
+qla24xx_configure_vp(scsi_qla_host_t *vha)
+{
+        struct fc_vport *fc_vport;
+        int ret;
+
+        fc_vport = vha->fc_vport;
+
+        DEBUG15(printk("scsi(%ld): %s: change request #3 for this host.\n",
+            vha->host_no, __func__));
+        ret = qla2x00_send_change_request(vha, 0x3, vha->vp_idx);
+        if (ret != QLA_SUCCESS) {
+                DEBUG15(qla_printk(KERN_ERR, vha, "Failed to enable receiving"
+                    " of RSCN requests: 0x%x\n", ret));
+                return;
+        } else {
+                /* Corresponds to SCR enabled */
+                clear_bit(VP_SCR_NEEDED, &vha->vp_flags);
+        }
+
+        vha->flags.online = 1;
+        if (qla24xx_configure_vhba(vha))
+                return;
+
+        atomic_set(&vha->vp_state, VP_ACTIVE);
+        fc_vport_set_state(fc_vport, FC_VPORT_ACTIVE);
+}
+
+void
+qla2x00_alert_all_vps(scsi_qla_host_t *ha, uint16_t *mb)
+{
+        int i, vp_idx_matched;
+        scsi_qla_host_t *vha;
+
+        if (ha->parent)
+                return;
+
+        i = find_next_bit((unsigned long *)ha->vp_idx_map,
+            MAX_MULTI_ID_FABRIC + 1, 1);
+        for (;i <= MAX_MULTI_ID_FABRIC;
+            i = find_next_bit((unsigned long *)ha->vp_idx_map,
+            MAX_MULTI_ID_FABRIC + 1, i + 1)) {
+                vp_idx_matched = 0;
+
+                list_for_each_entry(vha, &ha->vp_list, vp_list) {
+                        if (i == vha->vp_idx) {
+                                vp_idx_matched = 1;
+                                break;
+                        }
+                }
+
+                if (vp_idx_matched) {
+                        switch (mb[0]) {
+                        case MBA_LIP_OCCURRED:
+                        case MBA_LOOP_UP:
+                        case MBA_LOOP_DOWN:
+                        case MBA_LIP_RESET:
+                        case MBA_POINT_TO_POINT:
+                        case MBA_CHG_IN_CONNECTION:
+                        case MBA_PORT_UPDATE:
+                        case MBA_RSCN_UPDATE:
+                                DEBUG15(printk("scsi(%ld)%s: Async_event for"
+                                    " VP[%d], mb = 0x%x, vha=%p\n",
+                                    vha->host_no, __func__,i, *mb, vha));
+                                qla2x00_async_event(vha, mb);
+                                break;
+                        }
+                }
+        }
+}
+
+void
+qla2x00_vp_abort_isp(scsi_qla_host_t *vha)
+{
+        /*
+         * Physical port will do most of the abort and recovery work. We can
+         * just treat it as a loop down
+         */
+        if (atomic_read(&vha->loop_state) != LOOP_DOWN) {
+                atomic_set(&vha->loop_state, LOOP_DOWN);
+                qla2x00_mark_all_devices_lost(vha, 0);
+        } else {
+                if (!atomic_read(&vha->loop_down_timer))
+                        atomic_set(&vha->loop_down_timer, LOOP_DOWN_TIME);
+        }
+
+        DEBUG15(printk("scsi(%ld): Scheduling enable of Vport %d...\n",
+            vha->host_no, vha->vp_idx));
+        qla24xx_enable_vp(vha);
+}
+
+int
+qla2x00_do_dpc_vp(scsi_qla_host_t *vha)
+{
+        if (test_and_clear_bit(VP_IDX_ACQUIRED, &vha->vp_flags)) {
+                /* VP acquired. complete port configuration */
+                qla24xx_configure_vp(vha);
+                return 0;
+        }
+
+        if (test_and_clear_bit(ISP_ABORT_NEEDED, &vha->dpc_flags))
+                qla2x00_vp_abort_isp(vha);
+
+        if (test_and_clear_bit(RESET_MARKER_NEEDED, &vha->dpc_flags) &&
+            (!(test_and_set_bit(RESET_ACTIVE, &vha->dpc_flags)))) {
+                clear_bit(RESET_ACTIVE, &vha->dpc_flags);
+        }
+
+        if (test_and_clear_bit(LOOP_RESYNC_NEEDED, &vha->dpc_flags)) {
+                if (!(test_and_set_bit(LOOP_RESYNC_ACTIVE, &vha->dpc_flags))) {
+                        qla2x00_loop_resync(vha);
+                        clear_bit(LOOP_RESYNC_ACTIVE, &vha->dpc_flags);
+                }
+        }
+
+        return 0;
+}
+
+void
+qla2x00_do_dpc_all_vps(scsi_qla_host_t *ha)
+{
+        int ret;
+        int i, vp_idx_matched;
+        scsi_qla_host_t *vha;
+
+        if (ha->parent)
+                return;
+        if (list_empty(&ha->vp_list))
+                return;
+
+        clear_bit(VP_DPC_NEEDED, &ha->dpc_flags);
+
+        i = find_next_bit((unsigned long *)ha->vp_idx_map,
+            MAX_MULTI_ID_FABRIC + 1, 1);
+        for (;i <= MAX_MULTI_ID_FABRIC;
+            i = find_next_bit((unsigned long *)ha->vp_idx_map,
+            MAX_MULTI_ID_FABRIC + 1, i + 1)) {
+                vp_idx_matched = 0;
+
+                list_for_each_entry(vha, &ha->vp_list, vp_list) {
+                        if (i == vha->vp_idx) {
+                                vp_idx_matched = 1;
+                                break;
+                        }
+                }
+
+                if (vp_idx_matched)
+                        ret = qla2x00_do_dpc_vp(vha);
+        }
+}
+
+int
+qla24xx_vport_create_req_sanity_check(struct fc_vport *fc_vport)
+{
+        scsi_qla_host_t *ha = (scsi_qla_host_t *) fc_vport->shost->hostdata;
+        scsi_qla_host_t *vha;
+        uint8_t port_name[WWN_SIZE];
+
+        if (fc_vport->roles != FC_PORT_ROLE_FCP_INITIATOR)
+                return VPCERR_UNSUPPORTED;
+
+        /* Check up the F/W and H/W support NPIV */
+        if (!ha->flags.npiv_supported)
+                return VPCERR_UNSUPPORTED;
+
+        /* Check up whether npiv supported switch presented */
+        if (!(ha->switch_cap & FLOGI_MID_SUPPORT))
+                return VPCERR_NO_FABRIC_SUPP;
+
+        /* Check up unique WWPN */
+        u64_to_wwn(fc_vport->port_name, port_name);
+        vha = qla24xx_find_vhost_by_name(ha, port_name);
+        if (vha)
+                return VPCERR_BAD_WWN;
+
+        /* Check up max-npiv-supports */
+        if (ha->num_vhosts > ha->max_npiv_vports) {
+                DEBUG15(printk("scsi(%ld): num_vhosts %d is bigger than "
+                    "max_npv_vports %d.\n", ha->host_no,
+                    (uint16_t) ha->num_vhosts, (int) ha->max_npiv_vports));
+                return VPCERR_UNSUPPORTED;
+        }
+        return 0;
+}
+
+scsi_qla_host_t *
+qla24xx_create_vhost(struct fc_vport *fc_vport)
+{
+        scsi_qla_host_t *ha = (scsi_qla_host_t *) fc_vport->shost->hostdata;
+        scsi_qla_host_t *vha;
+        struct Scsi_Host *host;
+
+        host = scsi_host_alloc(&qla24xx_driver_template,
+            sizeof(scsi_qla_host_t));
+        if (!host) {
+                printk(KERN_WARNING
+                    "qla2xxx: scsi_host_alloc() failed for vport\n");
+                return(NULL);
+        }
+
+        vha = (scsi_qla_host_t *)host->hostdata;
+
+        /* clone the parent hba */
+        memcpy(vha, ha, sizeof (scsi_qla_host_t));
+
+        fc_vport->dd_data = vha;
+
+        vha->node_name = kmalloc(WWN_SIZE * sizeof(char), GFP_KERNEL);
+        if (!vha->node_name)
+                goto create_vhost_failed_1;
+
+        vha->port_name = kmalloc(WWN_SIZE * sizeof(char), GFP_KERNEL);
+        if (!vha->port_name)
+                goto create_vhost_failed_2;
+
+        /* New host info */
+        u64_to_wwn(fc_vport->node_name, vha->node_name);
+        u64_to_wwn(fc_vport->port_name, vha->port_name);
+
+        vha->host = host;
+        vha->host_no = host->host_no;
+        vha->parent = ha;
+        vha->fc_vport = fc_vport;
+        vha->device_flags = 0;
+        vha->instance = num_hosts;
+        vha->vp_idx = qla24xx_allocate_vp_id(vha);
+        if (vha->vp_idx > ha->max_npiv_vports) {
+                DEBUG15(printk("scsi(%ld): Couldn't allocate vp_id.\n",
+                        vha->host_no));
+                goto create_vhost_failed_3;
+        }
+        vha->mgmt_svr_loop_id = 10 + vha->vp_idx;
+
+        init_MUTEX(&vha->mbx_cmd_sem);
+        init_MUTEX_LOCKED(&vha->mbx_intr_sem);
+
+        INIT_LIST_HEAD(&vha->list);
+        INIT_LIST_HEAD(&vha->fcports);
+        INIT_LIST_HEAD(&vha->vp_fcports);
+
+        vha->dpc_flags = 0L;
+        set_bit(REGISTER_FDMI_NEEDED, &vha->dpc_flags);
+        set_bit(REGISTER_FC4_NEEDED, &vha->dpc_flags);
+
+        /*
+         * To fix the issue of processing a parent's RSCN for the vport before
+         * its SCR is complete.
+         */
+        set_bit(VP_SCR_NEEDED, &vha->vp_flags);
+        atomic_set(&vha->loop_state, LOOP_DOWN);
+        atomic_set(&vha->loop_down_timer, LOOP_DOWN_TIME);
+
+        qla2x00_start_timer(vha, qla2x00_timer, WATCH_INTERVAL);
+
+        host->can_queue = vha->request_q_length + 128;
+        host->this_id = 255;
+        host->cmd_per_lun = 3;
+        host->max_cmd_len = MAX_CMDSZ;
+        host->max_channel = MAX_BUSES - 1;
+        host->max_lun = MAX_LUNS;
+        host->unique_id = vha->instance;
+        host->max_id = MAX_TARGETS_2200;
+        host->transportt = qla2xxx_transport_vport_template;
+
+        DEBUG15(printk("DEBUG: detect vport hba %ld at address = %p\n",
+            vha->host_no, vha));
+
+        vha->flags.init_done = 1;
+        num_hosts++;
+
+        down(&ha->vport_sem);
+        set_bit(vha->vp_idx, (unsigned long *)ha->vp_idx_map);
+        ha->cur_vport_count++;
+        up(&ha->vport_sem);
+
+        return vha;
+
+create_vhost_failed_3:
+        kfree(vha->port_name);
+
+create_vhost_failed_2:
+        kfree(vha->node_name);
+
+create_vhost_failed_1:
+        return NULL;
+}