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linux/drivers/scsi/snic/snic.h
Narsimhulu Musini 0da8519b2b snic: Fixing race in the hba reset and IO/TM completion 
While HBA reset is in progress, if IO/TM completion is received for the
same IO then IO/TM completion path releases the driver private resources
associated with IO. This fix prevents releasing the resources in
IO and TM completion path if HBA reset is in progress.

Signed-off-by: Narsimhulu Musini <nmusini@cisco.com>
Signed-off-by: Sesidhar Baddela <sebaddel@cisco.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-04-11 16:57:09 -04:00

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/*
* 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_HOST_RESET_CMD_TERM \
(SNIC_DEV_RST_NOTSUP | SNIC_SCSI_CLEANUP | SNIC_HOST_RESET_ISSUED)
#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,
};
#define SNIC_INTRHDLR_NAMSZ (2 * IFNAMSIZ)
struct snic_msix_entry {
int requested;
char devname[SNIC_INTRHDLR_NAMSZ];
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 */
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