[SCSI] csiostor: Chelsio FCoE offload driver

Signed-off-by: Naresh Kumar Inna <naresh@chelsio.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 1274 insertions, 0 deletions

diff --git a/drivers/scsi/csiostor/csio_init.c b/drivers/scsi/csiostor/csio_init.c
new file mode 100644
index 000000000000..fdd408ff80ad
--- /dev/null
+++ b/drivers/scsi/csiostor/csio_init.c
@@ -0,0 +1,1274 @@
+/*
+ * This file is part of the Chelsio FCoE driver for Linux.
+ *
+ * Copyright (c) 2008-2012 Chelsio Communications, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/aer.h>
+#include <linux/mm.h>
+#include <linux/notifier.h>
+#include <linux/kdebug.h>
+#include <linux/seq_file.h>
+#include <linux/debugfs.h>
+#include <linux/string.h>
+#include <linux/export.h>
+
+#include "csio_init.h"
+#include "csio_defs.h"
+
+#define CSIO_MIN_MEMPOOL_SZ	64
+
+static struct dentry *csio_debugfs_root;
+
+static struct scsi_transport_template *csio_fcoe_transport;
+static struct scsi_transport_template *csio_fcoe_transport_vport;
+
+/*
+ * debugfs support
+ */
+static int
+csio_mem_open(struct inode *inode, struct file *file)
+{
+	file->private_data = inode->i_private;
+	return 0;
+}
+
+static ssize_t
+csio_mem_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
+{
+	loff_t pos = *ppos;
+	loff_t avail = file->f_path.dentry->d_inode->i_size;
+	unsigned int mem = (uintptr_t)file->private_data & 3;
+	struct csio_hw *hw = file->private_data - mem;
+
+	if (pos < 0)
+		return -EINVAL;
+	if (pos >= avail)
+		return 0;
+	if (count > avail - pos)
+		count = avail - pos;
+
+	while (count) {
+		size_t len;
+		int ret, ofst;
+		__be32 data[16];
+
+		if (mem == MEM_MC)
+			ret = csio_hw_mc_read(hw, pos, data, NULL);
+		else
+			ret = csio_hw_edc_read(hw, mem, pos, data, NULL);
+		if (ret)
+			return ret;
+
+		ofst = pos % sizeof(data);
+		len = min(count, sizeof(data) - ofst);
+		if (copy_to_user(buf, (u8 *)data + ofst, len))
+			return -EFAULT;
+
+		buf += len;
+		pos += len;
+		count -= len;
+	}
+	count = pos - *ppos;
+	*ppos = pos;
+	return count;
+}
+
+static const struct file_operations csio_mem_debugfs_fops = {
+	.owner   = THIS_MODULE,
+	.open    = csio_mem_open,
+	.read    = csio_mem_read,
+	.llseek  = default_llseek,
+};
+
+static void __devinit
+csio_add_debugfs_mem(struct csio_hw *hw, const char *name,
+		     unsigned int idx, unsigned int size_mb)
+{
+	struct dentry *de;
+
+	de = debugfs_create_file(name, S_IRUSR, hw->debugfs_root,
+				 (void *)hw + idx, &csio_mem_debugfs_fops);
+	if (de && de->d_inode)
+		de->d_inode->i_size = size_mb << 20;
+}
+
+static int __devinit
+csio_setup_debugfs(struct csio_hw *hw)
+{
+	int i;
+
+	if (IS_ERR_OR_NULL(hw->debugfs_root))
+		return -1;
+
+	i = csio_rd_reg32(hw, MA_TARGET_MEM_ENABLE);
+	if (i & EDRAM0_ENABLE)
+		csio_add_debugfs_mem(hw, "edc0", MEM_EDC0, 5);
+	if (i & EDRAM1_ENABLE)
+		csio_add_debugfs_mem(hw, "edc1", MEM_EDC1, 5);
+	if (i & EXT_MEM_ENABLE)
+		csio_add_debugfs_mem(hw, "mc", MEM_MC,
+		      EXT_MEM_SIZE_GET(csio_rd_reg32(hw, MA_EXT_MEMORY_BAR)));
+	return 0;
+}
+
+/*
+ * csio_dfs_create - Creates and sets up per-hw debugfs.
+ *
+ */
+static int
+csio_dfs_create(struct csio_hw *hw)
+{
+	if (csio_debugfs_root) {
+		hw->debugfs_root = debugfs_create_dir(pci_name(hw->pdev),
+							csio_debugfs_root);
+		csio_setup_debugfs(hw);
+	}
+
+	return 0;
+}
+
+/*
+ * csio_dfs_destroy - Destroys per-hw debugfs.
+ */
+static int
+csio_dfs_destroy(struct csio_hw *hw)
+{
+	if (hw->debugfs_root)
+		debugfs_remove_recursive(hw->debugfs_root);
+
+	return 0;
+}
+
+/*
+ * csio_dfs_init - Debug filesystem initialization for the module.
+ *
+ */
+static int
+csio_dfs_init(void)
+{
+	csio_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
+	if (!csio_debugfs_root)
+		pr_warn("Could not create debugfs entry, continuing\n");
+
+	return 0;
+}
+
+/*
+ * csio_dfs_exit - debugfs cleanup for the module.
+ */
+static void
+csio_dfs_exit(void)
+{
+	debugfs_remove(csio_debugfs_root);
+}
+
+/*
+ * csio_pci_init - PCI initialization.
+ * @pdev: PCI device.
+ * @bars: Bitmask of bars to be requested.
+ *
+ * Initializes the PCI function by enabling MMIO, setting bus
+ * mastership and setting DMA mask.
+ */
+static int
+csio_pci_init(struct pci_dev *pdev, int *bars)
+{
+	int rv = -ENODEV;
+
+	*bars = pci_select_bars(pdev, IORESOURCE_MEM);
+
+	if (pci_enable_device_mem(pdev))
+		goto err;
+
+	if (pci_request_selected_regions(pdev, *bars, KBUILD_MODNAME))
+		goto err_disable_device;
+
+	pci_set_master(pdev);
+	pci_try_set_mwi(pdev);
+
+	if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
+		pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
+	} else if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
+		pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
+	} else {
+		dev_err(&pdev->dev, "No suitable DMA available.\n");
+		goto err_release_regions;
+	}
+
+	return 0;
+
+err_release_regions:
+	pci_release_selected_regions(pdev, *bars);
+err_disable_device:
+	pci_disable_device(pdev);
+err:
+	return rv;
+
+}
+
+/*
+ * csio_pci_exit - PCI unitialization.
+ * @pdev: PCI device.
+ * @bars: Bars to be released.
+ *
+ */
+static void
+csio_pci_exit(struct pci_dev *pdev, int *bars)
+{
+	pci_release_selected_regions(pdev, *bars);
+	pci_disable_device(pdev);
+}
+
+/*
+ * csio_hw_init_workers - Initialize the HW module's worker threads.
+ * @hw: HW module.
+ *
+ */
+static void
+csio_hw_init_workers(struct csio_hw *hw)
+{
+	INIT_WORK(&hw->evtq_work, csio_evtq_worker);
+}
+
+static void
+csio_hw_exit_workers(struct csio_hw *hw)
+{
+	cancel_work_sync(&hw->evtq_work);
+	flush_scheduled_work();
+}
+
+static int
+csio_create_queues(struct csio_hw *hw)
+{
+	int i, j;
+	struct csio_mgmtm *mgmtm = csio_hw_to_mgmtm(hw);
+	int rv;
+	struct csio_scsi_cpu_info *info;
+
+	if (hw->flags & CSIO_HWF_Q_FW_ALLOCED)
+		return 0;
+
+	if (hw->intr_mode != CSIO_IM_MSIX) {
+		rv = csio_wr_iq_create(hw, NULL, hw->intr_iq_idx,
+					0, hw->pport[0].portid, false, NULL);
+		if (rv != 0) {
+			csio_err(hw, " Forward Interrupt IQ failed!: %d\n", rv);
+			return rv;
+		}
+	}
+
+	/* FW event queue */
+	rv = csio_wr_iq_create(hw, NULL, hw->fwevt_iq_idx,
+			       csio_get_fwevt_intr_idx(hw),
+			       hw->pport[0].portid, true, NULL);
+	if (rv != 0) {
+		csio_err(hw, "FW event IQ config failed!: %d\n", rv);
+		return rv;
+	}
+
+	/* Create mgmt queue */
+	rv = csio_wr_eq_create(hw, NULL, mgmtm->eq_idx,
+			mgmtm->iq_idx, hw->pport[0].portid, NULL);
+
+	if (rv != 0) {
+		csio_err(hw, "Mgmt EQ create failed!: %d\n", rv);
+		goto err;
+	}
+
+	/* Create SCSI queues */
+	for (i = 0; i < hw->num_pports; i++) {
+		info = &hw->scsi_cpu_info[i];
+
+		for (j = 0; j < info->max_cpus; j++) {
+			struct csio_scsi_qset *sqset = &hw->sqset[i][j];
+
+			rv = csio_wr_iq_create(hw, NULL, sqset->iq_idx,
+					       sqset->intr_idx, i, false, NULL);
+			if (rv != 0) {
+				csio_err(hw,
+				   "SCSI module IQ config failed [%d][%d]:%d\n",
+				   i, j, rv);
+				goto err;
+			}
+			rv = csio_wr_eq_create(hw, NULL, sqset->eq_idx,
+					       sqset->iq_idx, i, NULL);
+			if (rv != 0) {
+				csio_err(hw,
+				   "SCSI module EQ config failed [%d][%d]:%d\n",
+				   i, j, rv);
+				goto err;
+			}
+		} /* for all CPUs */
+	} /* For all ports */
+
+	hw->flags |= CSIO_HWF_Q_FW_ALLOCED;
+	return 0;
+err:
+	csio_wr_destroy_queues(hw, true);
+	return -EINVAL;
+}
+
+/*
+ * csio_config_queues - Configure the DMA queues.
+ * @hw: HW module.
+ *
+ * Allocates memory for queues are registers them with FW.
+ */
+int
+csio_config_queues(struct csio_hw *hw)
+{
+	int i, j, idx, k = 0;
+	int rv;
+	struct csio_scsi_qset *sqset;
+	struct csio_mgmtm *mgmtm = csio_hw_to_mgmtm(hw);
+	struct csio_scsi_qset *orig;
+	struct csio_scsi_cpu_info *info;
+
+	if (hw->flags & CSIO_HWF_Q_MEM_ALLOCED)
+		return csio_create_queues(hw);
+
+	/* Calculate number of SCSI queues for MSIX we would like */
+	hw->num_scsi_msix_cpus = num_online_cpus();
+	hw->num_sqsets = num_online_cpus() * hw->num_pports;
+
+	if (hw->num_sqsets > CSIO_MAX_SCSI_QSETS) {
+		hw->num_sqsets = CSIO_MAX_SCSI_QSETS;
+		hw->num_scsi_msix_cpus = CSIO_MAX_SCSI_CPU;
+	}
+
+	/* Initialize max_cpus, may get reduced during msix allocations */
+	for (i = 0; i < hw->num_pports; i++)
+		hw->scsi_cpu_info[i].max_cpus = hw->num_scsi_msix_cpus;
+
+	csio_dbg(hw, "nsqsets:%d scpus:%d\n",
+		    hw->num_sqsets, hw->num_scsi_msix_cpus);
+
+	csio_intr_enable(hw);
+
+	if (hw->intr_mode != CSIO_IM_MSIX) {
+
+		/* Allocate Forward interrupt iq. */
+		hw->intr_iq_idx = csio_wr_alloc_q(hw, CSIO_INTR_IQSIZE,
+						CSIO_INTR_WRSIZE, CSIO_INGRESS,
+						(void *)hw, 0, 0, NULL);
+		if (hw->intr_iq_idx == -1) {
+			csio_err(hw,
+				 "Forward interrupt queue creation failed\n");
+			goto intr_disable;
+		}
+	}
+
+	/* Allocate the FW evt queue */
+	hw->fwevt_iq_idx = csio_wr_alloc_q(hw, CSIO_FWEVT_IQSIZE,
+					   CSIO_FWEVT_WRSIZE,
+					   CSIO_INGRESS, (void *)hw,
+					   CSIO_FWEVT_FLBUFS, 0,
+					   csio_fwevt_intx_handler);
+	if (hw->fwevt_iq_idx == -1) {
+		csio_err(hw, "FW evt queue creation failed\n");
+		goto intr_disable;
+	}
+
+	/* Allocate the mgmt queue */
+	mgmtm->eq_idx = csio_wr_alloc_q(hw, CSIO_MGMT_EQSIZE,
+				      CSIO_MGMT_EQ_WRSIZE,
+				      CSIO_EGRESS, (void *)hw, 0, 0, NULL);
+	if (mgmtm->eq_idx == -1) {
+		csio_err(hw, "Failed to alloc egress queue for mgmt module\n");
+		goto intr_disable;
+	}
+
+	/* Use FW IQ for MGMT req completion */
+	mgmtm->iq_idx = hw->fwevt_iq_idx;
+
+	/* Allocate SCSI queues */
+	for (i = 0; i < hw->num_pports; i++) {
+		info = &hw->scsi_cpu_info[i];
+
+		for (j = 0; j < hw->num_scsi_msix_cpus; j++) {
+			sqset = &hw->sqset[i][j];
+
+			if (j >= info->max_cpus) {
+				k = j % info->max_cpus;
+				orig = &hw->sqset[i][k];
+				sqset->eq_idx = orig->eq_idx;
+				sqset->iq_idx = orig->iq_idx;
+				continue;
+			}
+
+			idx = csio_wr_alloc_q(hw, csio_scsi_eqsize, 0,
+					      CSIO_EGRESS, (void *)hw, 0, 0,
+					      NULL);
+			if (idx == -1) {
+				csio_err(hw, "EQ creation failed for idx:%d\n",
+					    idx);
+				goto intr_disable;
+			}
+
+			sqset->eq_idx = idx;
+
+			idx = csio_wr_alloc_q(hw, CSIO_SCSI_IQSIZE,
+					     CSIO_SCSI_IQ_WRSZ, CSIO_INGRESS,
+					     (void *)hw, 0, 0,
+					     csio_scsi_intx_handler);
+			if (idx == -1) {
+				csio_err(hw, "IQ creation failed for idx:%d\n",
+					    idx);
+				goto intr_disable;
+			}
+			sqset->iq_idx = idx;
+		} /* for all CPUs */
+	} /* For all ports */
+
+	hw->flags |= CSIO_HWF_Q_MEM_ALLOCED;
+
+	rv = csio_create_queues(hw);
+	if (rv != 0)
+		goto intr_disable;
+
+	/*
+	 * Now request IRQs for the vectors. In the event of a failure,
+	 * cleanup is handled internally by this function.
+	 */
+	rv = csio_request_irqs(hw);
+	if (rv != 0)
+		return -EINVAL;
+
+	return 0;
+
+intr_disable:
+	csio_intr_disable(hw, false);
+
+	return -EINVAL;
+}
+
+static int
+csio_resource_alloc(struct csio_hw *hw)
+{
+	struct csio_wrm *wrm = csio_hw_to_wrm(hw);
+	int rv = -ENOMEM;
+
+	wrm->num_q = ((CSIO_MAX_SCSI_QSETS * 2) + CSIO_HW_NIQ +
+		       CSIO_HW_NEQ + CSIO_HW_NFLQ + CSIO_HW_NINTXQ);
+
+	hw->mb_mempool = mempool_create_kmalloc_pool(CSIO_MIN_MEMPOOL_SZ,
+						  sizeof(struct csio_mb));
+	if (!hw->mb_mempool)
+		goto err;
+
+	hw->rnode_mempool = mempool_create_kmalloc_pool(CSIO_MIN_MEMPOOL_SZ,
+						     sizeof(struct csio_rnode));
+	if (!hw->rnode_mempool)
+		goto err_free_mb_mempool;
+
+	hw->scsi_pci_pool = pci_pool_create("csio_scsi_pci_pool", hw->pdev,
+					    CSIO_SCSI_RSP_LEN, 8, 0);
+	if (!hw->scsi_pci_pool)
+		goto err_free_rn_pool;
+
+	return 0;
+
+err_free_rn_pool:
+	mempool_destroy(hw->rnode_mempool);
+	hw->rnode_mempool = NULL;
+err_free_mb_mempool:
+	mempool_destroy(hw->mb_mempool);
+	hw->mb_mempool = NULL;
+err:
+	return rv;
+}
+
+static void
+csio_resource_free(struct csio_hw *hw)
+{
+	pci_pool_destroy(hw->scsi_pci_pool);
+	hw->scsi_pci_pool = NULL;
+	mempool_destroy(hw->rnode_mempool);
+	hw->rnode_mempool = NULL;
+	mempool_destroy(hw->mb_mempool);
+	hw->mb_mempool = NULL;
+}
+
+/*
+ * csio_hw_alloc - Allocate and initialize the HW module.
+ * @pdev: PCI device.
+ *
+ * Allocates HW structure, DMA, memory resources, maps BARS to
+ * host memory and initializes HW module.
+ */
+static struct csio_hw * __devinit
+csio_hw_alloc(struct pci_dev *pdev)
+{
+	struct csio_hw *hw;
+
+	hw = kzalloc(sizeof(struct csio_hw), GFP_KERNEL);
+	if (!hw)
+		goto err;
+
+	hw->pdev = pdev;
+	strncpy(hw->drv_version, CSIO_DRV_VERSION, 32);
+
+	/* memory pool/DMA pool allocation */
+	if (csio_resource_alloc(hw))
+		goto err_free_hw;
+
+	/* Get the start address of registers from BAR 0 */
+	hw->regstart = ioremap_nocache(pci_resource_start(pdev, 0),
+				       pci_resource_len(pdev, 0));
+	if (!hw->regstart) {
+		csio_err(hw, "Could not map BAR 0, regstart = %p\n",
+			 hw->regstart);
+		goto err_resource_free;
+	}
+
+	csio_hw_init_workers(hw);
+
+	if (csio_hw_init(hw))
+		goto err_unmap_bar;
+
+	csio_dfs_create(hw);
+
+	csio_dbg(hw, "hw:%p\n", hw);
+
+	return hw;
+
+err_unmap_bar:
+	csio_hw_exit_workers(hw);
+	iounmap(hw->regstart);
+err_resource_free:
+	csio_resource_free(hw);
+err_free_hw:
+	kfree(hw);
+err:
+	return NULL;
+}
+
+/*
+ * csio_hw_free - Uninitialize and free the HW module.
+ * @hw: The HW module
+ *
+ * Disable interrupts, uninit the HW module, free resources, free hw.
+ */
+static void
+csio_hw_free(struct csio_hw *hw)
+{
+	csio_intr_disable(hw, true);
+	csio_hw_exit_workers(hw);
+	csio_hw_exit(hw);
+	iounmap(hw->regstart);
+	csio_dfs_destroy(hw);
+	csio_resource_free(hw);
+	kfree(hw);
+}
+
+/**
+ * csio_shost_init - Create and initialize the lnode module.
+ * @hw:		The HW module.
+ * @dev:	The device associated with this invocation.
+ * @probe:	Called from probe context or not?
+ * @os_pln:	Parent lnode if any.
+ *
+ * Allocates lnode structure via scsi_host_alloc, initializes
+ * shost, initializes lnode module and registers with SCSI ML
+ * via scsi_host_add. This function is shared between physical and
+ * virtual node ports.
+ */
+struct csio_lnode *
+csio_shost_init(struct csio_hw *hw, struct device *dev,
+		  bool probe, struct csio_lnode *pln)
+{
+	struct Scsi_Host  *shost = NULL;
+	struct csio_lnode *ln;
+
+	csio_fcoe_shost_template.cmd_per_lun = csio_lun_qdepth;
+	csio_fcoe_shost_vport_template.cmd_per_lun = csio_lun_qdepth;
+
+	/*
+	 * hw->pdev is the physical port's PCI dev structure,
+	 * which will be different from the NPIV dev structure.
+	 */
+	if (dev == &hw->pdev->dev)
+		shost = scsi_host_alloc(
+				&csio_fcoe_shost_template,
+				sizeof(struct csio_lnode));
+	else
+		shost = scsi_host_alloc(
+				&csio_fcoe_shost_vport_template,
+				sizeof(struct csio_lnode));
+
+	if (!shost)
+		goto err;
+
+	ln = shost_priv(shost);
+	memset(ln, 0, sizeof(struct csio_lnode));
+
+	/* Link common lnode to this lnode */
+	ln->dev_num = (shost->host_no << 16);
+
+	shost->can_queue = CSIO_MAX_QUEUE;
+	shost->this_id = -1;
+	shost->unique_id = shost->host_no;
+	shost->max_cmd_len = 16; /* Max CDB length supported */
+	shost->max_id = min_t(uint32_t, csio_fcoe_rnodes,
+			      hw->fres_info.max_ssns);
+	shost->max_lun = CSIO_MAX_LUN;
+	if (dev == &hw->pdev->dev)
+		shost->transportt = csio_fcoe_transport;
+	else
+		shost->transportt = csio_fcoe_transport_vport;
+
+	/* root lnode */
+	if (!hw->rln)
+		hw->rln = ln;
+
+	/* Other initialization here: Common, Transport specific */
+	if (csio_lnode_init(ln, hw, pln))
+		goto err_shost_put;
+
+	if (scsi_add_host(shost, dev))
+		goto err_lnode_exit;
+
+	return ln;
+
+err_lnode_exit:
+	csio_lnode_exit(ln);
+err_shost_put:
+	scsi_host_put(shost);
+err:
+	return NULL;
+}
+
+/**
+ * csio_shost_exit - De-instantiate the shost.
+ * @ln:		The lnode module corresponding to the shost.
+ *
+ */
+void
+csio_shost_exit(struct csio_lnode *ln)
+{
+	struct Scsi_Host *shost = csio_ln_to_shost(ln);
+	struct csio_hw *hw = csio_lnode_to_hw(ln);
+
+	/* Inform transport */
+	fc_remove_host(shost);
+
+	/* Inform SCSI ML */
+	scsi_remove_host(shost);
+
+	/* Flush all the events, so that any rnode removal events
+	 * already queued are all handled, before we remove the lnode.
+	 */
+	spin_lock_irq(&hw->lock);
+	csio_evtq_flush(hw);
+	spin_unlock_irq(&hw->lock);
+
+	csio_lnode_exit(ln);
+	scsi_host_put(shost);
+}
+
+struct csio_lnode *
+csio_lnode_alloc(struct csio_hw *hw)
+{
+	return csio_shost_init(hw, &hw->pdev->dev, false, NULL);
+}
+
+void
+csio_lnodes_block_request(struct csio_hw *hw)
+{
+	struct Scsi_Host  *shost;
+	struct csio_lnode *sln;
+	struct csio_lnode *ln;
+	struct list_head *cur_ln, *cur_cln;
+	struct csio_lnode **lnode_list;
+	int cur_cnt = 0, ii;
+
+	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
+			GFP_KERNEL);
+	if (!lnode_list) {
+		csio_err(hw, "Failed to allocate lnodes_list");
+		return;
+	}
+
+	spin_lock_irq(&hw->lock);
+	/* Traverse sibling lnodes */
+	list_for_each(cur_ln, &hw->sln_head) {
+		sln = (struct csio_lnode *) cur_ln;
+		lnode_list[cur_cnt++] = sln;
+
+		/* Traverse children lnodes */
+		list_for_each(cur_cln, &sln->cln_head)
+			lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
+	}
+	spin_unlock_irq(&hw->lock);
+
+	for (ii = 0; ii < cur_cnt; ii++) {
+		csio_dbg(hw, "Blocking IOs on lnode: %p\n", lnode_list[ii]);
+		ln = lnode_list[ii];
+		shost = csio_ln_to_shost(ln);
+		scsi_block_requests(shost);
+
+	}
+	kfree(lnode_list);
+}
+
+void
+csio_lnodes_unblock_request(struct csio_hw *hw)
+{
+	struct csio_lnode *ln;
+	struct Scsi_Host  *shost;
+	struct csio_lnode *sln;
+	struct list_head *cur_ln, *cur_cln;
+	struct csio_lnode **lnode_list;
+	int cur_cnt = 0, ii;
+
+	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
+			GFP_KERNEL);
+	if (!lnode_list) {
+		csio_err(hw, "Failed to allocate lnodes_list");
+		return;
+	}
+
+	spin_lock_irq(&hw->lock);
+	/* Traverse sibling lnodes */
+	list_for_each(cur_ln, &hw->sln_head) {
+		sln = (struct csio_lnode *) cur_ln;
+		lnode_list[cur_cnt++] = sln;
+
+		/* Traverse children lnodes */
+		list_for_each(cur_cln, &sln->cln_head)
+			lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
+	}
+	spin_unlock_irq(&hw->lock);
+
+	for (ii = 0; ii < cur_cnt; ii++) {
+		csio_dbg(hw, "unblocking IOs on lnode: %p\n", lnode_list[ii]);
+		ln = lnode_list[ii];
+		shost = csio_ln_to_shost(ln);
+		scsi_unblock_requests(shost);
+	}
+	kfree(lnode_list);
+}
+
+void
+csio_lnodes_block_by_port(struct csio_hw *hw, uint8_t portid)
+{
+	struct csio_lnode *ln;
+	struct Scsi_Host  *shost;
+	struct csio_lnode *sln;
+	struct list_head *cur_ln, *cur_cln;
+	struct csio_lnode **lnode_list;
+	int cur_cnt = 0, ii;
+
+	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
+			GFP_KERNEL);
+	if (!lnode_list) {
+		csio_err(hw, "Failed to allocate lnodes_list");
+		return;
+	}
+
+	spin_lock_irq(&hw->lock);
+	/* Traverse sibling lnodes */
+	list_for_each(cur_ln, &hw->sln_head) {
+		sln = (struct csio_lnode *) cur_ln;
+		if (sln->portid != portid)
+			continue;
+
+		lnode_list[cur_cnt++] = sln;
+
+		/* Traverse children lnodes */
+		list_for_each(cur_cln, &sln->cln_head)
+			lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
+	}
+	spin_unlock_irq(&hw->lock);
+
+	for (ii = 0; ii < cur_cnt; ii++) {
+		csio_dbg(hw, "Blocking IOs on lnode: %p\n", lnode_list[ii]);
+		ln = lnode_list[ii];
+		shost = csio_ln_to_shost(ln);
+		scsi_block_requests(shost);
+	}
+	kfree(lnode_list);
+}
+
+void
+csio_lnodes_unblock_by_port(struct csio_hw *hw, uint8_t portid)
+{
+	struct csio_lnode *ln;
+	struct Scsi_Host  *shost;
+	struct csio_lnode *sln;
+	struct list_head *cur_ln, *cur_cln;
+	struct csio_lnode **lnode_list;
+	int cur_cnt = 0, ii;
+
+	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
+			GFP_KERNEL);
+	if (!lnode_list) {
+		csio_err(hw, "Failed to allocate lnodes_list");
+		return;
+	}
+
+	spin_lock_irq(&hw->lock);
+	/* Traverse sibling lnodes */
+	list_for_each(cur_ln, &hw->sln_head) {
+		sln = (struct csio_lnode *) cur_ln;
+		if (sln->portid != portid)
+			continue;
+		lnode_list[cur_cnt++] = sln;
+
+		/* Traverse children lnodes */
+		list_for_each(cur_cln, &sln->cln_head)
+			lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
+	}
+	spin_unlock_irq(&hw->lock);
+
+	for (ii = 0; ii < cur_cnt; ii++) {
+		csio_dbg(hw, "unblocking IOs on lnode: %p\n", lnode_list[ii]);
+		ln = lnode_list[ii];
+		shost = csio_ln_to_shost(ln);
+		scsi_unblock_requests(shost);
+	}
+	kfree(lnode_list);
+}
+
+void
+csio_lnodes_exit(struct csio_hw *hw, bool npiv)
+{
+	struct csio_lnode *sln;
+	struct csio_lnode *ln;
+	struct list_head *cur_ln, *cur_cln;
+	struct csio_lnode **lnode_list;
+	int cur_cnt = 0, ii;
+
+	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
+			GFP_KERNEL);
+	if (!lnode_list) {
+		csio_err(hw, "lnodes_exit: Failed to allocate lnodes_list.\n");
+		return;
+	}
+
+	/* Get all child lnodes(NPIV ports) */
+	spin_lock_irq(&hw->lock);
+	list_for_each(cur_ln, &hw->sln_head) {
+		sln = (struct csio_lnode *) cur_ln;
+
+		/* Traverse children lnodes */
+		list_for_each(cur_cln, &sln->cln_head)
+			lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
+	}
+	spin_unlock_irq(&hw->lock);
+
+	/* Delete NPIV lnodes */
+	for (ii = 0; ii < cur_cnt; ii++) {
+		csio_dbg(hw, "Deleting child lnode: %p\n", lnode_list[ii]);
+		ln = lnode_list[ii];
+		fc_vport_terminate(ln->fc_vport);
+	}
+
+	/* Delete only npiv lnodes */
+	if (npiv)
+		goto free_lnodes;
+
+	cur_cnt = 0;
+	/* Get all physical lnodes */
+	spin_lock_irq(&hw->lock);
+	/* Traverse sibling lnodes */
+	list_for_each(cur_ln, &hw->sln_head) {
+		sln = (struct csio_lnode *) cur_ln;
+		lnode_list[cur_cnt++] = sln;
+	}
+	spin_unlock_irq(&hw->lock);
+
+	/* Delete physical lnodes */
+	for (ii = 0; ii < cur_cnt; ii++) {
+		csio_dbg(hw, "Deleting parent lnode: %p\n", lnode_list[ii]);
+		csio_shost_exit(lnode_list[ii]);
+	}
+
+free_lnodes:
+	kfree(lnode_list);
+}
+
+/*
+ * csio_lnode_init_post: Set lnode attributes after starting HW.
+ * @ln: lnode.
+ *
+ */
+static void
+csio_lnode_init_post(struct csio_lnode *ln)
+{
+	struct Scsi_Host  *shost = csio_ln_to_shost(ln);
+
+	csio_fchost_attr_init(ln);
+
+	scsi_scan_host(shost);
+}
+
+/*
+ * csio_probe_one - Instantiate this function.
+ * @pdev: PCI device
+ * @id: Device ID
+ *
+ * This is the .probe() callback of the driver. This function:
+ * - Initializes the PCI function by enabling MMIO, setting bus
+ *   mastership and setting DMA mask.
+ * - Allocates HW structure, DMA, memory resources, maps BARS to
+ *   host memory and initializes HW module.
+ * - Allocates lnode structure via scsi_host_alloc, initializes
+ *   shost, initialized lnode module and registers with SCSI ML
+ *   via scsi_host_add.
+ * - Enables interrupts, and starts the chip by kicking off the
+ *   HW state machine.
+ * - Once hardware is ready, initiated scan of the host via
+ *   scsi_scan_host.
+ */
+static int __devinit
+csio_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	int rv;
+	int bars;
+	int i;
+	struct csio_hw *hw;
+	struct csio_lnode *ln;
+
+	rv = csio_pci_init(pdev, &bars);
+	if (rv)
+		goto err;
+
+	hw = csio_hw_alloc(pdev);
+	if (!hw) {
+		rv = -ENODEV;
+		goto err_pci_exit;
+	}
+
+	pci_set_drvdata(pdev, hw);
+
+	if (csio_hw_start(hw) != 0) {
+		dev_err(&pdev->dev,
+			"Failed to start FW, continuing in debug mode.\n");
+		return 0;
+	}
+
+	sprintf(hw->fwrev_str, "%u.%u.%u.%u\n",
+		    FW_HDR_FW_VER_MAJOR_GET(hw->fwrev),
+		    FW_HDR_FW_VER_MINOR_GET(hw->fwrev),
+		    FW_HDR_FW_VER_MICRO_GET(hw->fwrev),
+		    FW_HDR_FW_VER_BUILD_GET(hw->fwrev));
+
+	for (i = 0; i < hw->num_pports; i++) {
+		ln = csio_shost_init(hw, &pdev->dev, true, NULL);
+		if (!ln) {
+			rv = -ENODEV;
+			break;
+		}
+		/* Initialize portid */
+		ln->portid = hw->pport[i].portid;
+
+		spin_lock_irq(&hw->lock);
+		if (csio_lnode_start(ln) != 0)
+			rv = -ENODEV;
+		spin_unlock_irq(&hw->lock);
+
+		if (rv)
+			break;
+
+		csio_lnode_init_post(ln);
+	}
+
+	if (rv)
+		goto err_lnode_exit;
+
+	return 0;
+
+err_lnode_exit:
+	csio_lnodes_block_request(hw);
+	spin_lock_irq(&hw->lock);
+	csio_hw_stop(hw);
+	spin_unlock_irq(&hw->lock);
+	csio_lnodes_unblock_request(hw);
+	pci_set_drvdata(hw->pdev, NULL);
+	csio_lnodes_exit(hw, 0);
+	csio_hw_free(hw);
+err_pci_exit:
+	csio_pci_exit(pdev, &bars);
+err:
+	dev_err(&pdev->dev, "probe of device failed: %d\n", rv);
+	return rv;
+}
+
+/*
+ * csio_remove_one - Remove one instance of the driver at this PCI function.
+ * @pdev: PCI device
+ *
+ * Used during hotplug operation.
+ */
+static void __devexit
+csio_remove_one(struct pci_dev *pdev)
+{
+	struct csio_hw *hw = pci_get_drvdata(pdev);
+	int bars = pci_select_bars(pdev, IORESOURCE_MEM);
+
+	csio_lnodes_block_request(hw);
+	spin_lock_irq(&hw->lock);
+
+	/* Stops lnode, Rnode s/m
+	 * Quiesce IOs.
+	 * All sessions with remote ports are unregistered.
+	 */
+	csio_hw_stop(hw);
+	spin_unlock_irq(&hw->lock);
+	csio_lnodes_unblock_request(hw);
+
+	csio_lnodes_exit(hw, 0);
+	csio_hw_free(hw);
+	pci_set_drvdata(pdev, NULL);
+	csio_pci_exit(pdev, &bars);
+}
+
+/*
+ * csio_pci_error_detected - PCI error was detected
+ * @pdev: PCI device
+ *
+ */
+static pci_ers_result_t
+csio_pci_error_detected(struct pci_dev *pdev, pci_channel_state_t state)
+{
+	struct csio_hw *hw = pci_get_drvdata(pdev);
+
+	csio_lnodes_block_request(hw);
+	spin_lock_irq(&hw->lock);
+
+	/* Post PCI error detected evt to HW s/m
+	 * HW s/m handles this evt by quiescing IOs, unregisters rports
+	 * and finally takes the device to offline.
+	 */
+	csio_post_event(&hw->sm, CSIO_HWE_PCIERR_DETECTED);
+	spin_unlock_irq(&hw->lock);
+	csio_lnodes_unblock_request(hw);
+	csio_lnodes_exit(hw, 0);
+	csio_intr_disable(hw, true);
+	pci_disable_device(pdev);
+	return state == pci_channel_io_perm_failure ?
+		PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_NEED_RESET;
+}
+
+/*
+ * csio_pci_slot_reset - PCI slot has been reset.
+ * @pdev: PCI device
+ *
+ */
+static pci_ers_result_t
+csio_pci_slot_reset(struct pci_dev *pdev)
+{
+	struct csio_hw *hw = pci_get_drvdata(pdev);
+	int ready;
+
+	if (pci_enable_device(pdev)) {
+		dev_err(&pdev->dev, "cannot re-enable device in slot reset\n");
+		return PCI_ERS_RESULT_DISCONNECT;
+	}
+
+	pci_set_master(pdev);
+	pci_restore_state(pdev);
+	pci_save_state(pdev);
+	pci_cleanup_aer_uncorrect_error_status(pdev);
+
+	/* Bring HW s/m to ready state.
+	 * but don't resume IOs.
+	 */
+	spin_lock_irq(&hw->lock);
+	csio_post_event(&hw->sm, CSIO_HWE_PCIERR_SLOT_RESET);
+	ready = csio_is_hw_ready(hw);
+	spin_unlock_irq(&hw->lock);
+
+	if (ready) {
+		return PCI_ERS_RESULT_RECOVERED;
+	} else {
+		dev_err(&pdev->dev, "Can't initialize HW when in slot reset\n");
+		return PCI_ERS_RESULT_DISCONNECT;
+	}
+}
+
+/*
+ * csio_pci_resume - Resume normal operations
+ * @pdev: PCI device
+ *
+ */
+static void
+csio_pci_resume(struct pci_dev *pdev)
+{
+	struct csio_hw *hw = pci_get_drvdata(pdev);
+	struct csio_lnode *ln;
+	int rv = 0;
+	int i;
+
+	/* Bring the LINK UP and Resume IO */
+
+	for (i = 0; i < hw->num_pports; i++) {
+		ln = csio_shost_init(hw, &pdev->dev, true, NULL);
+		if (!ln) {
+			rv = -ENODEV;
+			break;
+		}
+		/* Initialize portid */
+		ln->portid = hw->pport[i].portid;
+
+		spin_lock_irq(&hw->lock);
+		if (csio_lnode_start(ln) != 0)
+			rv = -ENODEV;
+		spin_unlock_irq(&hw->lock);
+
+		if (rv)
+			break;
+
+		csio_lnode_init_post(ln);
+	}
+
+	if (rv)
+		goto err_resume_exit;
+
+	return;
+
+err_resume_exit:
+	csio_lnodes_block_request(hw);
+	spin_lock_irq(&hw->lock);
+	csio_hw_stop(hw);
+	spin_unlock_irq(&hw->lock);
+	csio_lnodes_unblock_request(hw);
+	csio_lnodes_exit(hw, 0);
+	csio_hw_free(hw);
+	dev_err(&pdev->dev, "resume of device failed: %d\n", rv);
+}
+
+static struct pci_error_handlers csio_err_handler = {
+	.error_detected = csio_pci_error_detected,
+	.slot_reset	= csio_pci_slot_reset,
+	.resume		= csio_pci_resume,
+};
+
+static DEFINE_PCI_DEVICE_TABLE(csio_pci_tbl) = {
+	CSIO_DEVICE(CSIO_DEVID_T440DBG_FCOE, 0),	/* T440DBG FCOE */
+	CSIO_DEVICE(CSIO_DEVID_T420CR_FCOE, 0),		/* T420CR FCOE */
+	CSIO_DEVICE(CSIO_DEVID_T422CR_FCOE, 0),		/* T422CR FCOE */
+	CSIO_DEVICE(CSIO_DEVID_T440CR_FCOE, 0),		/* T440CR FCOE */
+	CSIO_DEVICE(CSIO_DEVID_T420BCH_FCOE, 0),	/* T420BCH FCOE */
+	CSIO_DEVICE(CSIO_DEVID_T440BCH_FCOE, 0),	/* T440BCH FCOE */
+	CSIO_DEVICE(CSIO_DEVID_T440CH_FCOE, 0),		/* T440CH FCOE */
+	CSIO_DEVICE(CSIO_DEVID_T420SO_FCOE, 0),		/* T420SO FCOE */
+	CSIO_DEVICE(CSIO_DEVID_T420CX_FCOE, 0),		/* T420CX FCOE */
+	CSIO_DEVICE(CSIO_DEVID_T420BT_FCOE, 0),		/* T420BT FCOE */
+	CSIO_DEVICE(CSIO_DEVID_T404BT_FCOE, 0),		/* T404BT FCOE */
+	CSIO_DEVICE(CSIO_DEVID_B420_FCOE, 0),		/* B420 FCOE */
+	CSIO_DEVICE(CSIO_DEVID_B404_FCOE, 0),		/* B404 FCOE */
+	CSIO_DEVICE(CSIO_DEVID_T480CR_FCOE, 0),		/* T480 CR FCOE */
+	CSIO_DEVICE(CSIO_DEVID_T440LPCR_FCOE, 0),	/* T440 LP-CR FCOE */
+	CSIO_DEVICE(CSIO_DEVID_PE10K, 0),		/* PE10K FCOE */
+	CSIO_DEVICE(CSIO_DEVID_PE10K_PF1, 0),	/* PE10K FCOE on PF1 */
+	{ 0, 0, 0, 0, 0, 0, 0 }
+};
+
+
+static struct pci_driver csio_pci_driver = {
+	.name		= KBUILD_MODNAME,
+	.driver		= {
+		.owner	= THIS_MODULE,
+	},
+	.id_table	= csio_pci_tbl,
+	.probe		= csio_probe_one,
+	.remove		= csio_remove_one,
+	.err_handler	= &csio_err_handler,
+};
+
+/*
+ * csio_init - Chelsio storage driver initialization function.
+ *
+ */
+static int __init
+csio_init(void)
+{
+	int rv = -ENOMEM;
+
+	pr_info("%s %s\n", CSIO_DRV_DESC, CSIO_DRV_VERSION);
+
+	csio_dfs_init();
+
+	csio_fcoe_transport = fc_attach_transport(&csio_fc_transport_funcs);
+	if (!csio_fcoe_transport)
+		goto err;
+
+	csio_fcoe_transport_vport =
+			fc_attach_transport(&csio_fc_transport_vport_funcs);
+	if (!csio_fcoe_transport_vport)
+		goto err_vport;
+
+	rv = pci_register_driver(&csio_pci_driver);
+	if (rv)
+		goto err_pci;
+
+	return 0;
+
+err_pci:
+	fc_release_transport(csio_fcoe_transport_vport);
+err_vport:
+	fc_release_transport(csio_fcoe_transport);
+err:
+	csio_dfs_exit();
+	return rv;
+}
+
+/*
+ * csio_exit - Chelsio storage driver uninitialization .
+ *
+ * Function that gets called in the unload path.
+ */
+static void __exit
+csio_exit(void)
+{
+	pci_unregister_driver(&csio_pci_driver);
+	csio_dfs_exit();
+	fc_release_transport(csio_fcoe_transport_vport);
+	fc_release_transport(csio_fcoe_transport);
+}
+
+module_init(csio_init);
+module_exit(csio_exit);
+MODULE_AUTHOR(CSIO_DRV_AUTHOR);
+MODULE_DESCRIPTION(CSIO_DRV_DESC);
+MODULE_LICENSE(CSIO_DRV_LICENSE);
+MODULE_DEVICE_TABLE(pci, csio_pci_tbl);
+MODULE_VERSION(CSIO_DRV_VERSION);
+MODULE_FIRMWARE(CSIO_FW_FNAME);