drivers/scsi/snic/snic_io.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /* Copyright 2014 Cisco Systems, Inc.  All rights reserved. */
   3
   4 #ifndef _SNIC_IO_H
   5 #define _SNIC_IO_H
   6
   7 #define SNIC_DFLT_SG_DESC_CNT   32      /* Default descriptors for sgl */
   8 #define SNIC_MAX_SG_DESC_CNT    60      /* Max descriptor for sgl */
   9 #define SNIC_SG_DESC_ALIGN      16      /* Descriptor address alignment */
  10
  11 /* SG descriptor for snic */
  12 struct snic_sg_desc {
  13         __le64 addr;
  14         __le32 len;
  15         u32 _resvd;
  16 };
  17
  18 struct snic_dflt_sgl {
  19         struct snic_sg_desc sg_desc[SNIC_DFLT_SG_DESC_CNT];
  20 };
  21
  22 struct snic_max_sgl {
  23         struct snic_sg_desc sg_desc[SNIC_MAX_SG_DESC_CNT];
  24 };
  25
  26 enum snic_req_cache_type {
  27         SNIC_REQ_CACHE_DFLT_SGL = 0,    /* cache with default size sgl */
  28         SNIC_REQ_CACHE_MAX_SGL,         /* cache with max size sgl */
  29         SNIC_REQ_TM_CACHE,              /* cache for task mgmt reqs contains
  30                                            snic_host_req objects only*/
  31         SNIC_REQ_MAX_CACHES             /* number of sgl caches */
  32 };
  33
  34 /* Per IO internal state */
  35 struct snic_internal_io_state {
  36         char    *rqi;
  37         u64     flags;
  38         u32     state;
  39         u32     abts_status;    /* Abort completion status */
  40         u32     lr_status;      /* device reset completion status */
  41 };
  42
  43 /* IO state machine */
  44 enum snic_ioreq_state {
  45         SNIC_IOREQ_NOT_INITED = 0,
  46         SNIC_IOREQ_PENDING,
  47         SNIC_IOREQ_ABTS_PENDING,
  48         SNIC_IOREQ_ABTS_COMPLETE,
  49         SNIC_IOREQ_LR_PENDING,
  50         SNIC_IOREQ_LR_COMPLETE,
  51         SNIC_IOREQ_COMPLETE,
  52 };
  53
  54 struct snic;
  55 struct snic_host_req;
  56
  57 /*
  58  * snic_req_info : Contains info about IO, one per scsi command.
  59  * Notes: Make sure that the structure is aligned to 16 B
  60  * this helps in easy access to snic_req_info from snic_host_req
  61  */
  62 struct snic_req_info {
  63         struct list_head list;
  64         struct snic_host_req *req;
  65         u64     start_time;             /* start time in jiffies */
  66         u16     rq_pool_type;           /* noticion of request pool type */
  67         u16     req_len;                /* buf len passing to fw (req + sgl)*/
  68         u32     tgt_id;
  69
  70         u32     tm_tag;
  71         u8      io_cmpl:1;              /* sets to 1 when fw completes IO */
  72         u8      resvd[3];
  73         struct scsi_cmnd *sc;           /* Associated scsi cmd */
  74         struct snic     *snic;          /* Associated snic */
  75         ulong   sge_va;                 /* Pointer to Resp Buffer */
  76         u64     snsbuf_va;
  77
  78         struct snic_host_req *abort_req;
  79         struct completion *abts_done;
  80
  81         struct snic_host_req *dr_req;
  82         struct completion *dr_done;
  83 };
  84
  85
  86 #define rqi_to_req(rqi) \
  87         ((struct snic_host_req *) (((struct snic_req_info *)rqi)->req))
  88
  89 #define req_to_rqi(req) \
  90         ((struct snic_req_info *) (((struct snic_host_req *)req)->hdr.init_ctx))
  91
  92 #define req_to_sgl(req) \
  93         ((struct snic_sg_desc *) (((struct snic_host_req *)req)+1))
  94
  95 struct snic_req_info *
  96 snic_req_init(struct snic *, int sg_cnt);
  97 void snic_req_free(struct snic *, struct snic_req_info *);
  98 void snic_calc_io_process_time(struct snic *, struct snic_req_info *);
  99 void snic_pci_unmap_rsp_buf(struct snic *, struct snic_req_info *);
 100 struct snic_host_req *
 101 snic_abort_req_init(struct snic *, struct snic_req_info *);
 102 struct snic_host_req *
 103 snic_dr_req_init(struct snic *, struct snic_req_info *);
 104 #endif /* _SNIC_IO_H */