/*
   * 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_STATS_H
  #define __SNIC_STATS_H
  
  struct snic_io_stats {
  	atomic64_t active;		/* Active IOs */
  	atomic64_t max_active;		/* Max # active IOs */
  	atomic64_t max_sgl;		/* Max # SGLs for any IO */
  	atomic64_t max_time;		/* Max time to process IO */
  	atomic64_t max_qtime;		/* Max time to Queue the IO */
  	atomic64_t max_cmpl_time;	/* Max time to complete the IO */
  	atomic64_t sgl_cnt[SNIC_MAX_SG_DESC_CNT]; /* SGL Counters */
  	atomic64_t max_io_sz;		/* Max IO Size */
  	atomic64_t compl;		/* IO Completions */
  	atomic64_t fail;		/* IO Failures */
  	atomic64_t req_null;		/* req or req info is NULL */
  	atomic64_t alloc_fail;		/* Alloc Failures */
  	atomic64_t sc_null;
  	atomic64_t io_not_found;	/* IO Not Found */
  	atomic64_t num_ios;		/* Number of IOs */
  };
  
  struct snic_abort_stats {
  	atomic64_t num;		/* Abort counter */
  	atomic64_t fail;	/* Abort Failure Counter */
  	atomic64_t drv_tmo;	/* Abort Driver Timeouts */
  	atomic64_t fw_tmo;	/* Abort Firmware Timeouts */
  	atomic64_t io_not_found;/* Abort IO Not Found */

  	atomic64_t q_fail;	/* Abort Queuing Failed */

  };
  
  struct snic_reset_stats {
  	atomic64_t dev_resets;		/* Device Reset Counter */
  	atomic64_t dev_reset_fail;	/* Device Reset Failures */
  	atomic64_t dev_reset_aborts;	/* Device Reset Aborts */
  	atomic64_t dev_reset_tmo;	/* Device Reset Timeout */
  	atomic64_t dev_reset_terms;	/* Device Reset terminate */
  	atomic64_t hba_resets;		/* hba/firmware resets */
  	atomic64_t hba_reset_cmpl;	/* hba/firmware reset completions */
  	atomic64_t hba_reset_fail;	/* hba/firmware failures */
  	atomic64_t snic_resets;		/* snic resets */
  	atomic64_t snic_reset_compl;	/* snic reset completions */
  	atomic64_t snic_reset_fail;	/* snic reset failures */
  };
  
  struct snic_fw_stats {
  	atomic64_t actv_reqs;		/* Active Requests */
  	atomic64_t max_actv_reqs;	/* Max Active Requests */
  	atomic64_t out_of_res;		/* Firmware Out Of Resources */
  	atomic64_t io_errs;		/* Firmware IO Firmware Errors */
  	atomic64_t scsi_errs;		/* Target hits check condition */
  };
  
  struct snic_misc_stats {
  	u64	last_isr_time;
  	u64	last_ack_time;

  	atomic64_t ack_isr_cnt;
  	atomic64_t cmpl_isr_cnt;
  	atomic64_t errnotify_isr_cnt;

  	atomic64_t max_cq_ents;		/* Max CQ Entries */
  	atomic64_t data_cnt_mismat;	/* Data Count Mismatch */
  	atomic64_t io_tmo;
  	atomic64_t io_aborted;
  	atomic64_t sgl_inval;		/* SGL Invalid */
  	atomic64_t abts_wq_alloc_fail;	/* Abort Path WQ desc alloc failure */
  	atomic64_t devrst_wq_alloc_fail;/* Device Reset - WQ desc alloc fail */
  	atomic64_t wq_alloc_fail;	/* IO WQ desc alloc failure */
  	atomic64_t no_icmnd_itmf_cmpls;
  	atomic64_t io_under_run;
  	atomic64_t qfull;

  	atomic64_t qsz_rampup;
  	atomic64_t qsz_rampdown;
  	atomic64_t last_qsz;

  	atomic64_t tgt_not_rdy;
  };
  
  struct snic_stats {
  	struct snic_io_stats io;
  	struct snic_abort_stats abts;
  	struct snic_reset_stats reset;
  	struct snic_fw_stats fw;
  	struct snic_misc_stats misc;
  	atomic64_t io_cmpl_skip;
  };
  
  int snic_stats_debugfs_init(struct snic *);
  void snic_stats_debugfs_remove(struct snic *);
  
  /* Auxillary function to update active IO counter */
  static inline void
  snic_stats_update_active_ios(struct snic_stats *s_stats)
  {
  	struct snic_io_stats *io = &s_stats->io;

  	int nr_active_ios;

  	nr_active_ios = atomic64_read(&io->active);

  	if (atomic64_read(&io->max_active) < nr_active_ios)
  		atomic64_set(&io->max_active, nr_active_ios);
  
  	atomic64_inc(&io->num_ios);
  }
  
  /* Auxillary function to update IO completion counter */
  static inline void
  snic_stats_update_io_cmpl(struct snic_stats *s_stats)
  {
  	atomic64_dec(&s_stats->io.active);
  	if (unlikely(atomic64_read(&s_stats->io_cmpl_skip)))
  		atomic64_dec(&s_stats->io_cmpl_skip);
  	else
  		atomic64_inc(&s_stats->io.compl);
  }
  #endif /* __SNIC_STATS_H */