Linux-libre 4.2-gnu

1 files changed, 414 insertions, 0 deletions

diff --git a/drivers/scsi/snic/snic.h b/drivers/scsi/snic/snic.h
new file mode 100644
index 000000000..d7f5ba6ba
--- /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 */