snic: driver for Cisco SCSI HBA

Cisco has developed a new PCI HBA interface called sNIC, which stands for
SCSI NIC. This is a new storage feature supported on specialized network
adapter. The new PCI function provides a uniform host interface and abstracts
backend storage.

[jejb: fix up checkpatch errors]
Signed-off-by: Narsimhulu Musini <nmusini@cisco.com>
Signed-off-by: Sesidhar Baddela <sebaddel@cisco.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>

36 files changed, 10256 insertions, 0 deletions

diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index ab8923d81fda..485d74a69dca 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -634,6 +634,23 @@ config FCOE_FNIC
 	  <file:Documentation/scsi/scsi.txt>.
 	  The module will be called fnic.
 
+config SCSI_SNIC
+	tristate "Cisco SNIC Driver"
+	depends on PCI && SCSI
+	help
+	  This is support for the Cisco PCI-Express SCSI HBA.
+
+	  To compile this driver as a module, choose M here and read
+	  <file:Documentation/scsi/scsi.txt>.
+	  The module will be called snic.
+
+config SCSI_SNIC_DEBUG_FS
+	bool "Cisco SNIC Driver Debugfs Support"
+	depends on SCSI_SNIC && DEBUG_FS
+	help
+	  This enables to list debugging information from SNIC Driver
+	  available via debugfs file system
+
 config SCSI_DMX3191D
 	tristate "DMX3191D SCSI support"
 	depends on PCI && SCSI
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index ee4517b00b83..91209e3d27e3 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_LIBFC)		+= libfc/
 obj-$(CONFIG_LIBFCOE)		+= fcoe/
 obj-$(CONFIG_FCOE)		+= fcoe/
 obj-$(CONFIG_FCOE_FNIC)		+= fnic/
+obj-$(CONFIG_SCSI_SNIC)		+= snic/
 obj-$(CONFIG_SCSI_BNX2X_FCOE)	+= libfc/ fcoe/ bnx2fc/
 obj-$(CONFIG_ISCSI_TCP) 	+= libiscsi.o	libiscsi_tcp.o iscsi_tcp.o
 obj-$(CONFIG_INFINIBAND_ISER) 	+= libiscsi.o
diff --git a/drivers/scsi/snic/Makefile b/drivers/scsi/snic/Makefile
new file mode 100644
index 000000000000..ef7c0dd47f40
--- /dev/null
+++ b/drivers/scsi/snic/Makefile
@@ -0,0 +1,17 @@
+obj-$(CONFIG_SCSI_SNIC) += snic.o
+
+snic-y := \
+	snic_attrs.o \
+	snic_main.o \
+	snic_res.o \
+	snic_isr.o \
+	snic_ctl.o \
+	snic_io.o \
+	snic_scsi.o \
+	snic_disc.o \
+	vnic_cq.o \
+	vnic_intr.o \
+	vnic_dev.o \
+	vnic_wq.o
+
+snic-$(CONFIG_SCSI_SNIC_DEBUG_FS) += snic_debugfs.o snic_trc.o
diff --git a/drivers/scsi/snic/cq_desc.h b/drivers/scsi/snic/cq_desc.h
new file mode 100644
index 000000000000..a5290562c1fa
--- /dev/null
+++ b/drivers/scsi/snic/cq_desc.h
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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.
+ */
+
+#ifndef _CQ_DESC_H_
+#define _CQ_DESC_H_
+
+/*
+ * Completion queue descriptor types
+ */
+enum cq_desc_types {
+	CQ_DESC_TYPE_WQ_ENET = 0,
+	CQ_DESC_TYPE_DESC_COPY = 1,
+	CQ_DESC_TYPE_WQ_EXCH = 2,
+	CQ_DESC_TYPE_RQ_ENET = 3,
+	CQ_DESC_TYPE_RQ_FCP = 4,
+};
+
+/* Completion queue descriptor: 16B
+ *
+ * All completion queues have this basic layout.  The
+ * type_specific area is unique for each completion
+ * queue type.
+ */
+struct cq_desc {
+	__le16 completed_index;
+	__le16 q_number;
+	u8 type_specific[11];
+	u8 type_color;
+};
+
+#define CQ_DESC_TYPE_BITS        4
+#define CQ_DESC_TYPE_MASK        ((1 << CQ_DESC_TYPE_BITS) - 1)
+#define CQ_DESC_COLOR_MASK       1
+#define CQ_DESC_COLOR_SHIFT      7
+#define CQ_DESC_Q_NUM_BITS       10
+#define CQ_DESC_Q_NUM_MASK       ((1 << CQ_DESC_Q_NUM_BITS) - 1)
+#define CQ_DESC_COMP_NDX_BITS    12
+#define CQ_DESC_COMP_NDX_MASK    ((1 << CQ_DESC_COMP_NDX_BITS) - 1)
+
+static inline void cq_desc_dec(const struct cq_desc *desc_arg,
+	u8 *type, u8 *color, u16 *q_number, u16 *completed_index)
+{
+	const struct cq_desc *desc = desc_arg;
+	const u8 type_color = desc->type_color;
+
+	*color = (type_color >> CQ_DESC_COLOR_SHIFT) & CQ_DESC_COLOR_MASK;
+
+	/*
+	 * Make sure color bit is read from desc *before* other fields
+	 * are read from desc.  Hardware guarantees color bit is last
+	 * bit (byte) written.  Adding the rmb() prevents the compiler
+	 * and/or CPU from reordering the reads which would potentially
+	 * result in reading stale values.
+	 */
+	rmb();
+
+	*type = type_color & CQ_DESC_TYPE_MASK;
+	*q_number = le16_to_cpu(desc->q_number) & CQ_DESC_Q_NUM_MASK;
+	*completed_index = le16_to_cpu(desc->completed_index) &
+		CQ_DESC_COMP_NDX_MASK;
+}
+
+#endif /* _CQ_DESC_H_ */
diff --git a/drivers/scsi/snic/cq_enet_desc.h b/drivers/scsi/snic/cq_enet_desc.h
new file mode 100644
index 000000000000..0a1be2ed0288
--- /dev/null
+++ b/drivers/scsi/snic/cq_enet_desc.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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.
+ */
+
+#ifndef _CQ_ENET_DESC_H_
+#define _CQ_ENET_DESC_H_
+
+#include "cq_desc.h"
+
+/* Ethernet completion queue descriptor: 16B */
+struct cq_enet_wq_desc {
+	__le16 completed_index;
+	__le16 q_number;
+	u8 reserved[11];
+	u8 type_color;
+};
+
+static inline void cq_enet_wq_desc_dec(struct cq_enet_wq_desc *desc,
+	u8 *type, u8 *color, u16 *q_number, u16 *completed_index)
+{
+	cq_desc_dec((struct cq_desc *)desc, type,
+		color, q_number, completed_index);
+}
+
+#endif /* _CQ_ENET_DESC_H_ */
diff --git a/drivers/scsi/snic/snic.h b/drivers/scsi/snic/snic.h
new file mode 100644
index 000000000000..d7f5ba6ba84c
--- /dev/null
+++ b/drivers/scsi/snic/snic.h
@@ -0,0 +1,414 @@
+/*
+ * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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.
+ */
+
+#ifndef _SNIC_H_
+#define _SNIC_H_
+
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/workqueue.h>
+#include <linux/bitops.h>
+#include <linux/mempool.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+
+#include "snic_disc.h"
+#include "snic_io.h"
+#include "snic_res.h"
+#include "snic_trc.h"
+#include "snic_stats.h"
+#include "vnic_dev.h"
+#include "vnic_wq.h"
+#include "vnic_cq.h"
+#include "vnic_intr.h"
+#include "vnic_stats.h"
+#include "vnic_snic.h"
+
+#define SNIC_DRV_NAME		"snic"
+#define SNIC_DRV_DESCRIPTION	"Cisco SCSI NIC Driver"
+#define SNIC_DRV_VERSION	"0.0.1.18"
+#define PFX			SNIC_DRV_NAME ":"
+#define DFX			SNIC_DRV_NAME "%d: "
+
+#define DESC_CLEAN_LOW_WATERMARK	8
+#define SNIC_UCSM_DFLT_THROTTLE_CNT_BLD 16 /* UCSM default throttle count */
+#define SNIC_MAX_IO_REQ			50 /* scsi_cmnd tag map entries */
+#define SNIC_MIN_IO_REQ			8  /* Min IO throttle count */
+#define SNIC_IO_LOCKS			64 /* IO locks: power of 2 */
+#define SNIC_DFLT_QUEUE_DEPTH		32 /* Default Queue Depth */
+#define SNIC_MAX_QUEUE_DEPTH		64 /* Max Queue Depth */
+#define SNIC_DFLT_CMD_TIMEOUT		90 /* Extended tmo for FW */
+
+/*
+ * Tag bits used for special requests.
+ */
+#define SNIC_TAG_ABORT		BIT(30)		/* Tag indicating abort */
+#define SNIC_TAG_DEV_RST	BIT(29)		/* Tag for device reset */
+#define SNIC_TAG_IOCTL_DEV_RST	BIT(28)		/* Tag for User Device Reset */
+#define SNIC_TAG_MASK		(BIT(24) - 1)	/* Mask for lookup */
+#define SNIC_NO_TAG		-1
+
+/*
+ * Command flags to identify the type of command and for other future use
+ */
+#define SNIC_NO_FLAGS			0
+#define SNIC_IO_INITIALIZED		BIT(0)
+#define SNIC_IO_ISSUED			BIT(1)
+#define SNIC_IO_DONE			BIT(2)
+#define SNIC_IO_REQ_NULL		BIT(3)
+#define SNIC_IO_ABTS_PENDING		BIT(4)
+#define SNIC_IO_ABORTED			BIT(5)
+#define SNIC_IO_ABTS_ISSUED		BIT(6)
+#define SNIC_IO_TERM_ISSUED		BIT(7)
+#define SNIC_IO_ABTS_TIMEDOUT		BIT(8)
+#define SNIC_IO_ABTS_TERM_DONE		BIT(9)
+#define SNIC_IO_ABTS_TERM_REQ_NULL	BIT(10)
+#define SNIC_IO_ABTS_TERM_TIMEDOUT	BIT(11)
+#define SNIC_IO_INTERNAL_TERM_PENDING	BIT(12)
+#define SNIC_IO_INTERNAL_TERM_ISSUED	BIT(13)
+#define SNIC_DEVICE_RESET		BIT(14)
+#define SNIC_DEV_RST_ISSUED		BIT(15)
+#define SNIC_DEV_RST_TIMEDOUT		BIT(16)
+#define SNIC_DEV_RST_ABTS_ISSUED	BIT(17)
+#define SNIC_DEV_RST_TERM_ISSUED	BIT(18)
+#define SNIC_DEV_RST_DONE		BIT(19)
+#define SNIC_DEV_RST_REQ_NULL		BIT(20)
+#define SNIC_DEV_RST_ABTS_DONE		BIT(21)
+#define SNIC_DEV_RST_TERM_DONE		BIT(22)
+#define SNIC_DEV_RST_ABTS_PENDING	BIT(23)
+#define SNIC_DEV_RST_PENDING		BIT(24)
+#define SNIC_DEV_RST_NOTSUP		BIT(25)
+#define SNIC_SCSI_CLEANUP		BIT(26)
+#define SNIC_HOST_RESET_ISSUED		BIT(27)
+
+#define SNIC_ABTS_TIMEOUT		30000		/* msec */
+#define SNIC_LUN_RESET_TIMEOUT		30000		/* msec */
+#define SNIC_HOST_RESET_TIMEOUT		30000		/* msec */
+
+
+/*
+ * These are protected by the hashed req_lock.
+ */
+#define CMD_SP(Cmnd)		\
+	(((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->rqi)
+#define CMD_STATE(Cmnd)		\
+	(((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->state)
+#define CMD_ABTS_STATUS(Cmnd)	\
+	(((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->abts_status)
+#define CMD_LR_STATUS(Cmnd)	\
+	(((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->lr_status)
+#define CMD_FLAGS(Cmnd)	\
+	(((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->flags)
+
+#define SNIC_INVALID_CODE 0x100	/* Hdr Status val unused by firmware */
+
+#define SNIC_MAX_TARGET			256
+#define SNIC_FLAGS_NONE			(0)
+
+/* snic module params */
+extern unsigned int snic_max_qdepth;
+
+/* snic debugging */
+extern unsigned int snic_log_level;
+
+#define SNIC_MAIN_LOGGING	0x1
+#define SNIC_SCSI_LOGGING	0x2
+#define SNIC_ISR_LOGGING	0x8
+#define SNIC_DESC_LOGGING	0x10
+
+#define SNIC_CHECK_LOGGING(LEVEL, CMD)		\
+do {						\
+	if (unlikely(snic_log_level & LEVEL))	\
+		do {				\
+			CMD;			\
+		} while (0);			\
+} while (0)
+
+#define SNIC_MAIN_DBG(host, fmt, args...)	\
+	SNIC_CHECK_LOGGING(SNIC_MAIN_LOGGING,		\
+		shost_printk(KERN_INFO, host, fmt, ## args);)
+
+#define SNIC_SCSI_DBG(host, fmt, args...)	\
+	SNIC_CHECK_LOGGING(SNIC_SCSI_LOGGING,		\
+		shost_printk(KERN_INFO, host, fmt, ##args);)
+
+#define SNIC_DISC_DBG(host, fmt, args...)	\
+	SNIC_CHECK_LOGGING(SNIC_SCSI_LOGGING,		\
+		shost_printk(KERN_INFO, host, fmt, ##args);)
+
+#define SNIC_ISR_DBG(host, fmt, args...)	\
+	SNIC_CHECK_LOGGING(SNIC_ISR_LOGGING,		\
+		shost_printk(KERN_INFO, host, fmt, ##args);)
+
+#define SNIC_HOST_ERR(host, fmt, args...)		\
+	shost_printk(KERN_ERR, host, fmt, ##args)
+
+#define SNIC_HOST_INFO(host, fmt, args...)		\
+	shost_printk(KERN_INFO, host, fmt, ##args)
+
+#define SNIC_INFO(fmt, args...)				\
+	pr_info(PFX fmt, ## args)
+
+#define SNIC_DBG(fmt, args...)				\
+	pr_info(PFX fmt, ## args)
+
+#define SNIC_ERR(fmt, args...)				\
+	pr_err(PFX fmt, ## args)
+
+#ifdef DEBUG
+#define SNIC_BUG_ON(EXPR) \
+	({ \
+		if (EXPR) { \
+			SNIC_ERR("SNIC BUG(%s)\n", #EXPR); \
+			BUG_ON(EXPR); \
+		} \
+	})
+#else
+#define SNIC_BUG_ON(EXPR) \
+	({ \
+		if (EXPR) { \
+			SNIC_ERR("SNIC BUG(%s) at %s : %d\n", \
+				 #EXPR, __func__, __LINE__); \
+			WARN_ON_ONCE(EXPR); \
+		} \
+	})
+#endif
+
+/* Soft assert */
+#define SNIC_ASSERT_NOT_IMPL(EXPR) \
+	({ \
+		if (EXPR) {\
+			SNIC_INFO("Functionality not impl'ed at %s:%d\n", \
+				  __func__, __LINE__); \
+			WARN_ON_ONCE(EXPR); \
+		} \
+	 })
+
+
+extern const char *snic_state_str[];
+
+enum snic_intx_intr_index {
+	SNIC_INTX_WQ_RQ_COPYWQ,
+	SNIC_INTX_ERR,
+	SNIC_INTX_NOTIFY,
+	SNIC_INTX_INTR_MAX,
+};
+
+enum snic_msix_intr_index {
+	SNIC_MSIX_WQ,
+	SNIC_MSIX_IO_CMPL,
+	SNIC_MSIX_ERR_NOTIFY,
+	SNIC_MSIX_INTR_MAX,
+};
+
+struct snic_msix_entry {
+	int requested;
+	char devname[IFNAMSIZ];
+	irqreturn_t (*isr)(int, void *);
+	void *devid;
+};
+
+enum snic_state {
+	SNIC_INIT = 0,
+	SNIC_ERROR,
+	SNIC_ONLINE,
+	SNIC_OFFLINE,
+	SNIC_FWRESET,
+};
+
+#define SNIC_WQ_MAX		1
+#define SNIC_CQ_IO_CMPL_MAX	1
+#define SNIC_CQ_MAX		(SNIC_WQ_MAX + SNIC_CQ_IO_CMPL_MAX)
+
+/* firmware version information */
+struct snic_fw_info {
+	u32	fw_ver;
+	u32	hid;			/* u16 hid | u16 vnic id */
+	u32	max_concur_ios;		/* max concurrent ios */
+	u32	max_sgs_per_cmd;	/* max sgls per IO */
+	u32	max_io_sz;		/* max io size supported */
+	u32	hba_cap;		/* hba capabilities */
+	u32	max_tgts;		/* max tgts supported */
+	u16	io_tmo;			/* FW Extended timeout */
+	struct completion *wait;	/* protected by snic lock*/
+};
+
+/*
+ * snic_work item : defined to process asynchronous events
+ */
+struct snic_work {
+	struct work_struct work;
+	u16	ev_id;
+	u64	*ev_data;
+};
+
+/*
+ * snic structure to represent SCSI vNIC
+ */
+struct snic {
+	/* snic specific members */
+	struct list_head list;
+	char name[IFNAMSIZ];
+	atomic_t state;
+	spinlock_t snic_lock;
+	struct completion *remove_wait;
+	bool in_remove;
+	bool stop_link_events;		/* stop processing link events */
+
+	/* discovery related */
+	struct snic_disc disc;
+
+	/* Scsi Host info */
+	struct Scsi_Host *shost;
+
+	/* vnic related structures */
+	struct vnic_dev_bar bar0;
+
+	struct vnic_stats *stats;
+	unsigned long stats_time;
+	unsigned long stats_reset_time;
+
+	struct vnic_dev *vdev;
+
+	/* hw resource info */
+	unsigned int wq_count;
+	unsigned int cq_count;
+	unsigned int intr_count;
+	unsigned int err_intr_offset;
+
+	int link_status; /* retrieved from svnic_dev_link_status() */
+	u32 link_down_cnt;
+
+	/* pci related */
+	struct pci_dev *pdev;
+	struct msix_entry msix_entry[SNIC_MSIX_INTR_MAX];
+	struct snic_msix_entry msix[SNIC_MSIX_INTR_MAX];
+
+	/* io related info */
+	mempool_t *req_pool[SNIC_REQ_MAX_CACHES]; /* (??) */
+	____cacheline_aligned spinlock_t io_req_lock[SNIC_IO_LOCKS];
+
+	/* Maintain snic specific commands, cmds with no tag in spl_cmd_list */
+	____cacheline_aligned spinlock_t spl_cmd_lock;
+	struct list_head spl_cmd_list;
+
+	unsigned int max_tag_id;
+	atomic_t ios_inflight;		/* io in flight counter */
+
+	struct vnic_snic_config config;
+
+	struct work_struct link_work;
+
+	/* firmware information */
+	struct snic_fw_info fwinfo;
+
+	/* Work for processing Target related work */
+	struct work_struct tgt_work;
+
+	/* Work for processing Discovery */
+	struct work_struct disc_work;
+
+	/* stats related */
+	unsigned int reset_stats;
+	atomic64_t io_cmpl_skip;
+	struct snic_stats s_stats;	/* Per SNIC driver stats */
+
+	/* platform specific */
+#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
+	struct dentry *stats_host;	/* Per snic debugfs root */
+	struct dentry *stats_file;	/* Per snic debugfs file */
+	struct dentry *reset_stats_file;/* Per snic reset stats file */
+#endif
+
+	/* completion queue cache line section */
+	____cacheline_aligned struct vnic_cq cq[SNIC_CQ_MAX];
+
+	/* work queue cache line section */
+	____cacheline_aligned struct vnic_wq wq[SNIC_WQ_MAX];
+	spinlock_t wq_lock[SNIC_WQ_MAX];
+
+	/* interrupt resource cache line section */
+	____cacheline_aligned struct vnic_intr intr[SNIC_MSIX_INTR_MAX];
+}; /* end of snic structure */
+
+/*
+ * SNIC Driver's Global Data
+ */
+struct snic_global {
+	struct list_head snic_list;
+	spinlock_t snic_list_lock;
+
+	struct kmem_cache *req_cache[SNIC_REQ_MAX_CACHES];
+
+	struct workqueue_struct *event_q;
+
+#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
+	/* debugfs related global data */
+	struct dentry *trc_root;
+	struct dentry *stats_root;
+
+	struct snic_trc trc ____cacheline_aligned;
+#endif
+};
+
+extern struct snic_global *snic_glob;
+
+int snic_glob_init(void);
+void snic_glob_cleanup(void);
+
+extern struct workqueue_struct *snic_event_queue;
+extern struct device_attribute *snic_attrs[];
+
+int snic_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
+int snic_abort_cmd(struct scsi_cmnd *);
+int snic_device_reset(struct scsi_cmnd *);
+int snic_host_reset(struct scsi_cmnd *);
+int snic_reset(struct Scsi_Host *, struct scsi_cmnd *);
+void snic_shutdown_scsi_cleanup(struct snic *);
+
+
+int snic_request_intr(struct snic *);
+void snic_free_intr(struct snic *);
+int snic_set_intr_mode(struct snic *);
+void snic_clear_intr_mode(struct snic *);
+
+int snic_fwcq_cmpl_handler(struct snic *, int);
+int snic_wq_cmpl_handler(struct snic *, int);
+void snic_free_wq_buf(struct vnic_wq *, struct vnic_wq_buf *);
+
+
+void snic_log_q_error(struct snic *);
+void snic_handle_link_event(struct snic *);
+void snic_handle_link(struct work_struct *);
+
+int snic_queue_exch_ver_req(struct snic *);
+int snic_io_exch_ver_cmpl_handler(struct snic *, struct snic_fw_req *);
+
+int snic_queue_wq_desc(struct snic *, void *os_buf, u16 len);
+
+void snic_handle_untagged_req(struct snic *, struct snic_req_info *);
+void snic_release_untagged_req(struct snic *, struct snic_req_info *);
+void snic_free_all_untagged_reqs(struct snic *);
+int snic_get_conf(struct snic *);
+void snic_set_state(struct snic *, enum snic_state);
+int snic_get_state(struct snic *);
+const char *snic_state_to_str(unsigned int);
+void snic_hex_dump(char *, char *, int);
+void snic_print_desc(const char *fn, char *os_buf, int len);
+const char *show_opcode_name(int val);
+#endif /* _SNIC_H */
diff --git a/drivers/scsi/snic/snic_attrs.c b/drivers/scsi/snic/snic_attrs.c
new file mode 100644
index 000000000000..32d5d556b6f8
--- /dev/null
+++ b/drivers/scsi/snic/snic_attrs.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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.
+ */
+
+#include <linux/string.h>
+#include <linux/device.h>
+
+#include "snic.h"
+
+static ssize_t
+snic_show_sym_name(struct device *dev,
+		struct device_attribute *attr,
+		char *buf)
+{
+	struct snic *snic = shost_priv(class_to_shost(dev));
+
+	return snprintf(buf, PAGE_SIZE, "%s\n", snic->name);
+}
+
+static ssize_t
+snic_show_state(struct device *dev,
+		struct device_attribute *attr,
+		char *buf)
+{
+	struct snic *snic = shost_priv(class_to_shost(dev));
+
+	return snprintf(buf, PAGE_SIZE, "%s\n",
+			snic_state_str[snic_get_state(snic)]);
+}
+
+static ssize_t
+snic_show_drv_version(struct device *dev,
+		      struct device_attribute *attr,
+		      char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%s\n", SNIC_DRV_VERSION);
+}
+
+static ssize_t
+snic_show_link_state(struct device *dev,
+		     struct device_attribute *attr,
+		     char *buf)
+{
+	struct snic *snic = shost_priv(class_to_shost(dev));
+
+	if (snic->config.xpt_type == SNIC_DAS)
+		snic->link_status = svnic_dev_link_status(snic->vdev);
+
+	return snprintf(buf, PAGE_SIZE, "%s\n",
+			(snic->link_status) ? "Link Up" : "Link Down");
+}
+
+static DEVICE_ATTR(snic_sym_name, S_IRUGO, snic_show_sym_name, NULL);
+static DEVICE_ATTR(snic_state, S_IRUGO, snic_show_state, NULL);
+static DEVICE_ATTR(drv_version, S_IRUGO, snic_show_drv_version, NULL);
+static DEVICE_ATTR(link_state, S_IRUGO, snic_show_link_state, NULL);
+
+struct device_attribute *snic_attrs[] = {
+	&dev_attr_snic_sym_name,
+	&dev_attr_snic_state,
+	&dev_attr_drv_version,
+	&dev_attr_link_state,
+	NULL,
+};
diff --git a/drivers/scsi/snic/snic_ctl.c b/drivers/scsi/snic/snic_ctl.c
new file mode 100644
index 000000000000..aebe75320ed3
--- /dev/null
+++ b/drivers/scsi/snic/snic_ctl.c
@@ -0,0 +1,279 @@
+/*
+ * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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.
+ */
+
+#include <linux/errno.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/spinlock.h>
+#include <linux/mempool.h>
+#include <scsi/scsi_tcq.h>
+#include <linux/ctype.h>
+
+#include "snic_io.h"
+#include "snic.h"
+#include "cq_enet_desc.h"
+#include "snic_fwint.h"
+
+/*
+ * snic_handle_link : Handles link flaps.
+ */
+void
+snic_handle_link(struct work_struct *work)
+{
+	struct snic *snic = container_of(work, struct snic, link_work);
+
+	if (snic->config.xpt_type != SNIC_DAS) {
+		SNIC_HOST_INFO(snic->shost, "Link Event Received.\n");
+		SNIC_ASSERT_NOT_IMPL(1);
+
+		return;
+	}
+
+	snic->link_status = svnic_dev_link_status(snic->vdev);
+	snic->link_down_cnt = svnic_dev_link_down_cnt(snic->vdev);
+	SNIC_HOST_INFO(snic->shost, "Link Event: Link %s.\n",
+		       ((snic->link_status) ? "Up" : "Down"));
+}
+
+
+/*
+ * snic_ver_enc : Encodes version str to int
+ * version string is similar to netmask string
+ */
+static int
+snic_ver_enc(const char *s)
+{
+	int v[4] = {0};
+	int  i = 0, x = 0;
+	char c;
+	const char *p = s;
+
+	/* validate version string */
+	if ((strlen(s) > 15) || (strlen(s) < 7))
+		goto end;
+
+	while ((c = *p++)) {
+		if (c == '.') {
+			i++;
+			continue;
+		}
+
+		if (i > 4 || !isdigit(c))
+			goto end;
+
+		v[i] = v[i] * 10 + (c - '0');
+	}
+
+	/* validate sub version numbers */
+	for (i = 3; i >= 0; i--)
+		if (v[i] > 0xff)
+			goto end;
+
+	x |= (v[0] << 24) | v[1] << 16 | v[2] << 8 | v[3];
+
+end:
+	if (x == 0) {
+		SNIC_ERR("Invalid version string [%s].\n", s);
+
+		return -1;
+	}
+
+	return x;
+} /* end of snic_ver_enc */
+
+/*
+ * snic_qeueue_exch_ver_req :
+ *
+ * Queues Exchange Version Request, to communicate host information
+ * in return, it gets firmware version details
+ */
+int
+snic_queue_exch_ver_req(struct snic *snic)
+{
+	struct snic_req_info *rqi = NULL;
+	struct snic_host_req *req = NULL;
+	u32 ver = 0;
+	int ret = 0;
+
+	SNIC_HOST_INFO(snic->shost, "Exch Ver Req Preparing...\n");
+
+	rqi = snic_req_init(snic, 0);
+	if (!rqi) {
+		SNIC_HOST_ERR(snic->shost,
+			      "Queuing Exch Ver Req failed, err = %d\n",
+			      ret);
+
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	req = rqi_to_req(rqi);
+
+	/* Initialize snic_host_req */
+	snic_io_hdr_enc(&req->hdr, SNIC_REQ_EXCH_VER, 0, SCSI_NO_TAG,
+			snic->config.hid, 0, (ulong)rqi);
+	ver = snic_ver_enc(SNIC_DRV_VERSION);
+	req->u.exch_ver.drvr_ver = cpu_to_le32(ver);
+	req->u.exch_ver.os_type = cpu_to_le32(SNIC_OS_LINUX);
+
+	snic_handle_untagged_req(snic, rqi);
+
+	ret = snic_queue_wq_desc(snic, req, sizeof(*req));
+	if (ret) {
+		snic_release_untagged_req(snic, rqi);
+		SNIC_HOST_ERR(snic->shost,
+			      "Queuing Exch Ver Req failed, err = %d\n",
+			      ret);
+		goto error;
+	}
+
+	SNIC_HOST_INFO(snic->shost, "Exch Ver Req is issued. ret = %d\n", ret);
+
+error:
+	return ret;
+} /* end of snic_queue_exch_ver_req */
+
+/*
+ * snic_io_exch_ver_cmpl_handler
+ */
+i