[SCSI] bfa: Driver and BSG enhancements.

- Added a new module parameter max_xfer_size to
  set the max_sectors in the scsi_host template.
- Added logic to handle request_irq() failure so
  that msix vector resource is de-allocated immediately
  when failure happens.
- BSG enhancements to collect vHBA releated info and port log.
- Removed the workaround of incrementing the module refcnt on bsg request.

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

drivers/scsi/bfa/bfa_defs_svc.h

@@ -1042,6 +1042,19 @@ struct bfa_itnim_ioprofile_s {
 	struct bfa_itnim_latency_s io_latency;
 };
 
+/*
+ *	vHBA port attribute values.
+ */
+struct bfa_vhba_attr_s {
+	wwn_t	nwwn;       /* node wwn */
+	wwn_t	pwwn;       /* port wwn */
+	u32	pid;        /* port ID */
+	bfa_boolean_t       io_profile; /* get it from fcpim mod */
+	bfa_boolean_t       plog_enabled;   /* portlog is enabled */
+	u16	path_tov;
+	u8	rsvd[2];
+};
+
 /*
  * FC physical port statistics.
  */

drivers/scsi/bfa/bfad.c

@@ -56,6 +56,7 @@ int		fdmi_enable = BFA_TRUE;
 int		pcie_max_read_reqsz;
 int		bfa_debugfs_enable = 1;
 int		msix_disable_cb = 0, msix_disable_ct = 0;
+int		max_xfer_size = BFAD_MAX_SECTORS >> 1;
 
 /* Firmware releated */
 u32	bfi_image_cb_size, bfi_image_ct_size, bfi_image_ct2_size;
@@ -144,6 +145,9 @@ MODULE_PARM_DESC(pcie_max_read_reqsz, "PCIe max read request size, default=0 "
 module_param(bfa_debugfs_enable, int, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(bfa_debugfs_enable, "Enables debugfs feature, default=1,"
 		" Range[false:0|true:1]");
+module_param(max_xfer_size, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(max_xfer_size, "default=32MB,"
+		" Range[64k|128k|256k|512k|1024k|2048k]");
 
 static void
 bfad_sm_uninit(struct bfad_s *bfad, enum bfad_sm_event event);
@@ -1015,6 +1019,12 @@ bfad_start_ops(struct bfad_s *bfad) {
 	struct bfad_vport_s *vport, *vport_new;
 	struct bfa_fcs_driver_info_s driver_info;
 
+	/* Limit min/max. xfer size to [64k-32MB] */
+	if (max_xfer_size < BFAD_MIN_SECTORS >> 1)
+		max_xfer_size = BFAD_MIN_SECTORS >> 1;
+	if (max_xfer_size > BFAD_MAX_SECTORS >> 1)
+		max_xfer_size = BFAD_MAX_SECTORS >> 1;
+
 	/* Fill the driver_info info to fcs*/
 	memset(&driver_info, 0, sizeof(driver_info));
 	strncpy(driver_info.version, BFAD_DRIVER_VERSION,
@@ -1231,6 +1241,9 @@ bfad_install_msix_handler(struct bfad_s *bfad)
 				free_irq(bfad->msix_tab[j].msix.vector,
 						&bfad->msix_tab[j]);
 
+			bfad->bfad_flags &= ~BFAD_MSIX_ON;
+			pci_disable_msix(bfad->pcidev);
+
 			return 1;
 		}
 	}
@@ -1306,6 +1319,7 @@ line_based:
 		/* Enable interrupt handler failed */
 		return 1;
 	}
+	bfad->bfad_flags |= BFAD_INTX_ON;
 
 	return error;
 }
@@ -1322,7 +1336,7 @@ bfad_remove_intr(struct bfad_s *bfad)
 
 		pci_disable_msix(bfad->pcidev);
 		bfad->bfad_flags &= ~BFAD_MSIX_ON;
-	} else {
+	} else if (bfad->bfad_flags & BFAD_INTX_ON) {
 		free_irq(bfad->pcidev->irq, bfad);
 	}
 }

drivers/scsi/bfa/bfad_bsg.c

@@ -22,30 +22,6 @@
 
 BFA_TRC_FILE(LDRV, BSG);
 
-/* bfad_im_bsg_get_kobject - increment the bfa refcnt */
-static void
-bfad_im_bsg_get_kobject(struct fc_bsg_job *job)
-{
-	struct Scsi_Host *shost = job->shost;
-	unsigned long flags;
-
-	spin_lock_irqsave(shost->host_lock, flags);
-	__module_get(shost->dma_dev->driver->owner);
-	spin_unlock_irqrestore(shost->host_lock, flags);
-}
-
-/* bfad_im_bsg_put_kobject - decrement the bfa refcnt */
-static void
-bfad_im_bsg_put_kobject(struct fc_bsg_job *job)
-{
-	struct Scsi_Host *shost = job->shost;
-	unsigned long flags;
-
-	spin_lock_irqsave(shost->host_lock, flags);
-	module_put(shost->dma_dev->driver->owner);
-	spin_unlock_irqrestore(shost->host_lock, flags);
-}
-
 int
 bfad_iocmd_ioc_enable(struct bfad_s *bfad, void *cmd)
 {
@@ -1467,6 +1443,25 @@ out:
 	return 0;
 }
 
+int
+bfad_iocmd_vhba_query(struct bfad_s *bfad, void *cmd)
+{
+	struct bfa_bsg_vhba_attr_s *iocmd =
+			(struct bfa_bsg_vhba_attr_s *)cmd;
+	struct bfa_vhba_attr_s *attr = &iocmd->attr;
+	unsigned long flags;
+
+	spin_lock_irqsave(&bfad->bfad_lock, flags);
+	attr->pwwn =  bfad->bfa.ioc.attr->pwwn;
+	attr->nwwn =  bfad->bfa.ioc.attr->nwwn;
+	attr->plog_enabled = (bfa_boolean_t)bfad->bfa.plog->plog_enabled;
+	attr->io_profile = bfa_fcpim_get_io_profile(&bfad->bfa);
+	attr->path_tov  = bfa_fcpim_path_tov_get(&bfad->bfa);
+	iocmd->status = BFA_STATUS_OK;
+	spin_unlock_irqrestore(&bfad->bfad_lock, flags);
+	return 0;
+}
+
 int
 bfad_iocmd_phy_update(struct bfad_s *bfad, void *cmd, unsigned int payload_len)
 {
@@ -1497,6 +1492,25 @@ out:
 	return 0;
 }
 
+int
+bfad_iocmd_porglog_get(struct bfad_s *bfad, void *cmd)
+{
+	struct bfa_bsg_debug_s *iocmd = (struct bfa_bsg_debug_s *)cmd;
+	void *iocmd_bufptr;
+
+	if (iocmd->bufsz < sizeof(struct bfa_plog_s)) {
+		bfa_trc(bfad, sizeof(struct bfa_plog_s));
+		iocmd->status = BFA_STATUS_EINVAL;
+		goto out;
+	}
+
+	iocmd->status = BFA_STATUS_OK;
+	iocmd_bufptr = (char *)iocmd + sizeof(struct bfa_bsg_debug_s);
+	memcpy(iocmd_bufptr, (u8 *) &bfad->plog_buf, sizeof(struct bfa_plog_s));
+out:
+	return 0;
+}
+
 static int
 bfad_iocmd_handler(struct bfad_s *bfad, unsigned int cmd, void *iocmd,
 		unsigned int payload_len)
@@ -1682,6 +1696,12 @@ bfad_iocmd_handler(struct bfad_s *bfad, unsigned int cmd, void *iocmd,
 	case IOCMD_PHY_READ_FW:
 		rc = bfad_iocmd_phy_read(bfad, iocmd, payload_len);
 		break;
+	case IOCMD_VHBA_QUERY:
+		rc = bfad_iocmd_vhba_query(bfad, iocmd);
+		break;
+	case IOCMD_DEBUG_PORTLOG:
+		rc = bfad_iocmd_porglog_get(bfad, iocmd);
+		break;
 	default:
 		rc = EINVAL;
 		break;
@@ -2111,9 +2131,6 @@ bfad_im_bsg_request(struct fc_bsg_job *job)
 {
 	uint32_t rc = BFA_STATUS_OK;
 
-	/* Increment the bfa module refcnt - if bsg request is in service */
-	bfad_im_bsg_get_kobject(job);
-
 	switch (job->request->msgcode) {
 	case FC_BSG_HST_VENDOR:
 		/* Process BSG HST Vendor requests */
@@ -2132,9 +2149,6 @@ bfad_im_bsg_request(struct fc_bsg_job *job)
 		break;
 	}
 
-	/* Decrement the bfa module refcnt - on completion of bsg request */
-	bfad_im_bsg_put_kobject(job);
-
 	return rc;
 }
 

drivers/scsi/bfa/bfad_bsg.h

@@ -84,6 +84,8 @@ enum {
 	IOCMD_PHY_GET_STATS,
 	IOCMD_PHY_UPDATE_FW,
 	IOCMD_PHY_READ_FW,
+	IOCMD_VHBA_QUERY,
+	IOCMD_DEBUG_PORTLOG,
 };
 
 struct bfa_bsg_gen_s {
@@ -459,6 +461,16 @@ struct bfa_bsg_phy_s {
 	u64	buf_ptr;
 };
 
+struct bfa_bsg_debug_s {
+	bfa_status_t	status;
+	u16		bfad_num;
+	u16		rsvd;
+	u32		bufsz;
+	int		inst_no;
+	u64		buf_ptr;
+	u64		offset;
+};
+
 struct bfa_bsg_phy_stats_s {
 	bfa_status_t	status;
 	u16	bfad_num;
@@ -466,6 +478,13 @@ struct bfa_bsg_phy_stats_s {
 	struct bfa_phy_stats_s	stats;
 };
 
+struct bfa_bsg_vhba_attr_s {
+	bfa_status_t	status;
+	u16		bfad_num;
+	u16		pcifn_id;
+	struct bfa_vhba_attr_s	attr;
+};
+
 struct bfa_bsg_fcpt_s {
 	bfa_status_t    status;
 	u16		vf_id;

drivers/scsi/bfa/bfad_drv.h

@@ -80,7 +80,7 @@
 #define BFAD_HAL_INIT_FAIL			0x00000100
 #define BFAD_FC4_PROBE_DONE			0x00000200
 #define BFAD_PORT_DELETE			0x00000001
-
+#define BFAD_INTX_ON				0x00000400
 /*
  * BFAD related definition
  */
@@ -93,6 +93,8 @@
  */
 #define BFAD_LUN_QUEUE_DEPTH	32
 #define BFAD_IO_MAX_SGE		SG_ALL
+#define BFAD_MIN_SECTORS	128 /* 64k   */
+#define BFAD_MAX_SECTORS	0xFFFF  /* 32 MB */
 
 #define bfad_isr_t irq_handler_t
 
@@ -343,6 +345,7 @@ extern int      msix_disable_ct;
 extern int      fdmi_enable;
 extern int      supported_fc4s;
 extern int	pcie_max_read_reqsz;
+extern int	max_xfer_size;
 extern int bfa_debugfs_enable;
 extern struct mutex bfad_mutex;
 

drivers/scsi/bfa/bfad_im.c

@@ -700,6 +700,9 @@ bfad_scsi_host_alloc(struct bfad_im_port_s *im_port, struct bfad_s *bfad)
 	else
 		sht = &bfad_im_vport_template;
 
+	if (max_xfer_size != BFAD_MAX_SECTORS >> 1)
+		sht->max_sectors = max_xfer_size << 1;
+
 	sht->sg_tablesize = bfad->cfg_data.io_max_sge;
 
 	return scsi_host_alloc(sht, sizeof(unsigned long));
@@ -777,7 +780,7 @@ struct scsi_host_template bfad_im_scsi_host_template = {
 	.cmd_per_lun = 3,
 	.use_clustering = ENABLE_CLUSTERING,
 	.shost_attrs = bfad_im_host_attrs,
-	.max_sectors = 0xFFFF,
+	.max_sectors = BFAD_MAX_SECTORS,
 	.vendor_id = BFA_PCI_VENDOR_ID_BROCADE,
 };
 
@@ -799,7 +802,7 @@ struct scsi_host_template bfad_im_vport_template = {
 	.cmd_per_lun = 3,
 	.use_clustering = ENABLE_CLUSTERING,
 	.shost_attrs = bfad_im_vport_attrs,
-	.max_sectors = 0xFFFF,
+	.max_sectors = BFAD_MAX_SECTORS,
 };
 
 bfa_status_t