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>
diff --git a/drivers/scsi/snic/snic.h b/drivers/scsi/snic/snic.h
new file mode 100644
index 0000000..d7f5ba6
--- /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 */