[SCSI] bfa: Resume BFA operations after firmware mismatch is resolved.

bfad.c & bfad_drv.h:
  * Created a kernel thread from pci_probe that does the bfad start
    operations after BFA init done on a firmware mismatch.
  * The kernel thread on a fw mismatch waits for an event from IOC
    call back and is woken up from bfa_cb_init() on BFA init success.
  * In normal cases of no firmware mismatch this thread is terminated
    in pci_probe.

bfa_fcs_lport.c, fabric.c, fcs_lport.h & vport.c:
  * Split the lport init to attach time and init time code, so that
    proper config attributes are set after firmware mismatch.

bfa_iocfc.c:
  * Handle an IOC timer issue, where the IOC timer would expire before
    the init completion and send Init fail event to the driver,
    however IOC init continues and completes successfully at the later
    stage. The bfa and driver were not handling this kind of deferred
    init completion.

Signed-off-by: Krishna Gudipati <kgudipat@brocade.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 149 insertions, 40 deletions

diff --git a/drivers/scsi/bfa/bfad.c b/drivers/scsi/bfa/bfad.c
index 965dfb5..4ccaeae 100644
--- a/drivers/scsi/bfa/bfad.c
+++ b/drivers/scsi/bfa/bfad.c
@@ -20,6 +20,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/kthread.h>
 #include "bfad_drv.h"
 #include "bfad_im.h"
 #include "bfad_tm.h"
@@ -97,6 +98,8 @@ bfad_fc4_probe(struct bfad_s *bfad)
 
 	if (ipfc_enable)
 		bfad_ipfc_probe(bfad);
+
+	bfad->bfad_flags |= BFAD_FC4_PROBE_DONE;
 ext:
 	return rc;
 }
@@ -108,6 +111,7 @@ bfad_fc4_probe_undo(struct bfad_s *bfad)
 	bfad_tm_probe_undo(bfad);
 	if (ipfc_enable)
 		bfad_ipfc_probe_undo(bfad);
+	bfad->bfad_flags &= ~BFAD_FC4_PROBE_DONE;
 }
 
 static void
@@ -175,9 +179,19 @@ bfa_cb_init(void *drv, bfa_status_t init_status)
 {
 	struct bfad_s  *bfad = drv;
 
-	if (init_status == BFA_STATUS_OK)
+	if (init_status == BFA_STATUS_OK) {
 		bfad->bfad_flags |= BFAD_HAL_INIT_DONE;
 
+		/* If BFAD_HAL_INIT_FAIL flag is set:
+		 * Wake up the kernel thread to start
+		 * the bfad operations after HAL init done
+		 */
+		if ((bfad->bfad_flags & BFAD_HAL_INIT_FAIL)) {
+			bfad->bfad_flags &= ~BFAD_HAL_INIT_FAIL;
+			wake_up_process(bfad->bfad_tsk);
+		}
+	}
+
 	complete(&bfad->comp);
 }
 
@@ -749,7 +763,13 @@ bfad_drv_init(struct bfad_s *bfad)
 	bfa_fcs_trc_init(&bfad->bfa_fcs, bfad->trcmod);
 	bfa_fcs_aen_init(&bfad->bfa_fcs, bfad->aen);
 	bfa_fcs_attach(&bfad->bfa_fcs, &bfad->bfa, bfad, BFA_FALSE);
-	bfa_fcs_init(&bfad->bfa_fcs);
+
+	/* Do FCS init only when HAL init is done */
+	if ((bfad->bfad_flags & BFAD_HAL_INIT_DONE)) {
+		bfa_fcs_init(&bfad->bfa_fcs);
+		bfad->bfad_flags |= BFAD_FCS_INIT_DONE;
+	}
+
 	bfa_fcs_driver_info_init(&bfad->bfa_fcs, &driver_info);
 	bfa_fcs_set_fdmi_param(&bfad->bfa_fcs, fdmi_enable);
 	spin_unlock_irqrestore(&bfad->bfad_lock, flags);
@@ -767,12 +787,22 @@ out_hal_mem_alloc_failure:
 void
 bfad_drv_uninit(struct bfad_s *bfad)
 {
+	unsigned long   flags;
+
+	spin_lock_irqsave(&bfad->bfad_lock, flags);
+	init_completion(&bfad->comp);
+	bfa_stop(&bfad->bfa);
+	spin_unlock_irqrestore(&bfad->bfad_lock, flags);
+	wait_for_completion(&bfad->comp);
+
 	del_timer_sync(&bfad->hal_tmo);
 	bfa_isr_disable(&bfad->bfa);
 	bfa_detach(&bfad->bfa);
 	bfad_remove_intr(bfad);
 	bfa_assert(list_empty(&bfad->file_q));
 	bfad_hal_mem_release(bfad);
+
+	bfad->bfad_flags &= ~BFAD_DRV_INIT_DONE;
 }
 
 void
@@ -863,6 +893,86 @@ bfad_drv_log_level_set(struct bfad_s *bfad)
 		bfa_log_set_level_all(&bfad->log_data, log_level);
 }
 
+bfa_status_t
+bfad_start_ops(struct bfad_s *bfad)
+{
+	int retval;
+
+	/* PPORT FCS config */
+	bfad_fcs_port_cfg(bfad);
+
+	retval = bfad_cfg_pport(bfad, BFA_PORT_ROLE_FCP_IM);
+	if (retval != BFA_STATUS_OK)
+		goto out_cfg_pport_failure;
+
+	/* BFAD level FC4 (IM/TM/IPFC) specific resource allocation */
+	retval = bfad_fc4_probe(bfad);
+	if (retval != BFA_STATUS_OK) {
+		printk(KERN_WARNING "bfad_fc4_probe failed\n");
+		goto out_fc4_probe_failure;
+	}
+
+	bfad_drv_start(bfad);
+
+	/*
+	 * If bfa_linkup_delay is set to -1 default; try to retrive the
+	 * value using the bfad_os_get_linkup_delay(); else use the
+	 * passed in module param value as the bfa_linkup_delay.
+	 */
+	if (bfa_linkup_delay < 0) {
+
+		bfa_linkup_delay = bfad_os_get_linkup_delay(bfad);
+		bfad_os_rport_online_wait(bfad);
+		bfa_linkup_delay = -1;
+
+	} else {
+		bfad_os_rport_online_wait(bfad);
+	}
+
+	bfa_log(bfad->logmod, BFA_LOG_LINUX_DEVICE_CLAIMED, bfad->pci_name);
+
+	return BFA_STATUS_OK;
+
+out_fc4_probe_failure:
+	bfad_fc4_probe_undo(bfad);
+	bfad_uncfg_pport(bfad);
+out_cfg_pport_failure:
+	return BFA_STATUS_FAILED;
+}
+
+int
+bfad_worker (void *ptr)
+{
+	struct bfad_s *bfad;
+	unsigned long   flags;
+
+	bfad = (struct bfad_s *)ptr;
+
+	while (!kthread_should_stop()) {
+
+		/* Check if the FCS init is done from bfad_drv_init;
+		 * if not done do FCS init and set the flag.
+		 */
+		if (!(bfad->bfad_flags & BFAD_FCS_INIT_DONE)) {
+			spin_lock_irqsave(&bfad->bfad_lock, flags);
+			bfa_fcs_init(&bfad->bfa_fcs);
+			bfad->bfad_flags |= BFAD_FCS_INIT_DONE;
+			spin_unlock_irqrestore(&bfad->bfad_lock, flags);
+		}
+
+		/* Start the bfad operations after HAL init done */
+		bfad_start_ops(bfad);
+
+		spin_lock_irqsave(&bfad->bfad_lock, flags);
+		bfad->bfad_tsk = NULL;
+		spin_unlock_irqrestore(&bfad->bfad_lock, flags);
+
+		break;
+	}
+
+	return 0;
+}
+
  /*
   *  PCI_entry PCI driver entries * {
   */
@@ -937,57 +1047,39 @@ bfad_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
 	bfad->ref_count = 0;
 	bfad->pport.bfad = bfad;
 
+	bfad->bfad_tsk = kthread_create(bfad_worker, (void *) bfad, "%s",
+					"bfad_worker");
+	if (IS_ERR(bfad->bfad_tsk)) {
+		printk(KERN_INFO "bfad[%d]: Kernel thread"
+			" creation failed!\n",
+			bfad->inst_no);
+		goto out_kthread_create_failure;
+	}
+
 	retval = bfad_drv_init(bfad);
 	if (retval != BFA_STATUS_OK)
 		goto out_drv_init_failure;
 	if (!(bfad->bfad_flags & BFAD_HAL_INIT_DONE)) {
+		bfad->bfad_flags |= BFAD_HAL_INIT_FAIL;
 		printk(KERN_WARNING "bfad%d: hal init failed\n", bfad->inst_no);
 		goto ok;
 	}
 
-	/*
-	 * PPORT FCS config
-	 */
-	bfad_fcs_port_cfg(bfad);
-
-	retval = bfad_cfg_pport(bfad, BFA_PORT_ROLE_FCP_IM);
+	retval = bfad_start_ops(bfad);
 	if (retval != BFA_STATUS_OK)
-		goto out_cfg_pport_failure;
+		goto out_start_ops_failure;
 
-	/*
-	 * BFAD level FC4 (IM/TM/IPFC) specific resource allocation
-	 */
-	retval = bfad_fc4_probe(bfad);
-	if (retval != BFA_STATUS_OK) {
-		printk(KERN_WARNING "bfad_fc4_probe failed\n");
-		goto out_fc4_probe_failure;
-	}
-
-	bfad_drv_start(bfad);
+	kthread_stop(bfad->bfad_tsk);
+	bfad->bfad_tsk = NULL;
 
-	/*
-	 * If bfa_linkup_delay is set to -1 default; try to retrive the
-	 * value using the bfad_os_get_linkup_delay(); else use the
-	 * passed in module param value as the bfa_linkup_delay.
-	 */
-	if (bfa_linkup_delay < 0) {
-		bfa_linkup_delay = bfad_os_get_linkup_delay(bfad);
-		bfad_os_rport_online_wait(bfad);
-		bfa_linkup_delay = -1;
-	} else {
-		bfad_os_rport_online_wait(bfad);
-	}
-
-	bfa_log(bfad->logmod, BFA_LOG_LINUX_DEVICE_CLAIMED, bfad->pci_name);
 ok:
 	return 0;
 
-out_fc4_probe_failure:
-	bfad_fc4_probe_undo(bfad);
-	bfad_uncfg_pport(bfad);
-out_cfg_pport_failure:
+out_start_ops_failure:
 	bfad_drv_uninit(bfad);
 out_drv_init_failure:
+	kthread_stop(bfad->bfad_tsk);
+out_kthread_create_failure:
 	mutex_lock(&bfad_mutex);
 	bfad_inst--;
 	list_del(&bfad->list_entry);
@@ -1012,6 +1104,11 @@ bfad_pci_remove(struct pci_dev *pdev)
 
 	bfa_trc(bfad, bfad->inst_no);
 
+	spin_lock_irqsave(&bfad->bfad_lock, flags);
+	if (bfad->bfad_tsk != NULL)
+		kthread_stop(bfad->bfad_tsk);
+	spin_unlock_irqrestore(&bfad->bfad_lock, flags);
+
 	if ((bfad->bfad_flags & BFAD_DRV_INIT_DONE)
 	    && !(bfad->bfad_flags & BFAD_HAL_INIT_DONE)) {
 
@@ -1028,13 +1125,25 @@ bfad_pci_remove(struct pci_dev *pdev)
 		goto remove_sysfs;
 	}
 
-	if (bfad->bfad_flags & BFAD_HAL_START_DONE)
+	if (bfad->bfad_flags & BFAD_HAL_START_DONE) {
 		bfad_drv_stop(bfad);
+	} else if (bfad->bfad_flags & BFAD_DRV_INIT_DONE) {
+		/* Invoking bfa_stop() before bfa_detach
+		 * when HAL and DRV init are success
+		 * but HAL start did not occur.
+		 */
+		spin_lock_irqsave(&bfad->bfad_lock, flags);
+		init_completion(&bfad->comp);
+		bfa_stop(&bfad->bfa);
+		spin_unlock_irqrestore(&bfad->bfad_lock, flags);
+		wait_for_completion(&bfad->comp);
+	}
 
 	bfad_remove_intr(bfad);
-
 	del_timer_sync(&bfad->hal_tmo);
-	bfad_fc4_probe_undo(bfad);
+
+	if (bfad->bfad_flags & BFAD_FC4_PROBE_DONE)
+		bfad_fc4_probe_undo(bfad);
 
 	if (bfad->bfad_flags & BFAD_CFG_PPORT_DONE)
 		bfad_uncfg_pport(bfad);