drivers/scsi/snic/snic_io.h

   1 /*
   2  * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
   3  *
   4  * This program is free software; you may redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15  * SOFTWARE.
  16  */
  17
  18 #ifndef _SNIC_IO_H
  19 #define _SNIC_IO_H
  20
  21 #define SNIC_DFLT_SG_DESC_CNT   32      /* Default descriptors for sgl */
  22 #define SNIC_MAX_SG_DESC_CNT    60      /* Max descriptor for sgl */
  23 #define SNIC_SG_DESC_ALIGN      16      /* Descriptor address alignment */
  24
  25 /* SG descriptor for snic */
  26 struct snic_sg_desc {
  27         __le64 addr;
  28         __le32 len;
  29         u32 _resvd;
  30 };
  31
  32 struct snic_dflt_sgl {
  33         struct snic_sg_desc sg_desc[SNIC_DFLT_SG_DESC_CNT];
  34 };
  35
  36 struct snic_max_sgl {
  37         struct snic_sg_desc sg_desc[SNIC_MAX_SG_DESC_CNT];
  38 };
  39
  40 enum snic_req_cache_type {
  41         SNIC_REQ_CACHE_DFLT_SGL = 0,    /* cache with default size sgl */
  42         SNIC_REQ_CACHE_MAX_SGL,         /* cache with max size sgl */
  43         SNIC_REQ_TM_CACHE,              /* cache for task mgmt reqs contains
  44                                            snic_host_req objects only*/
  45         SNIC_REQ_MAX_CACHES             /* number of sgl caches */
  46 };
  47
  48 /* Per IO internal state */
  49 struct snic_internal_io_state {
  50         char    *rqi;
  51         u64     flags;
  52         u32     state;
  53         u32     abts_status;    /* Abort completion status */
  54         u32     lr_status;      /* device reset completion status */
  55 };
  56
  57 /* IO state machine */
  58 enum snic_ioreq_state {
  59         SNIC_IOREQ_NOT_INITED = 0,
  60         SNIC_IOREQ_PENDING,
  61         SNIC_IOREQ_ABTS_PENDING,
  62         SNIC_IOREQ_ABTS_COMPLETE,
  63         SNIC_IOREQ_LR_PENDING,
  64         SNIC_IOREQ_LR_COMPLETE,
  65         SNIC_IOREQ_COMPLETE,
  66 };
  67
  68 struct snic;
  69 struct snic_host_req;
  70
  71 /*
  72  * snic_req_info : Contains info about IO, one per scsi command.
  73  * Notes: Make sure that the structure is aligned to 16 B
  74  * this helps in easy access to snic_req_info from snic_host_req
  75  */
  76 struct snic_req_info {
  77         struct list_head list;
  78         struct snic_host_req *req;
  79         u64     start_time;             /* start time in jiffies */
  80         u16     rq_pool_type;           /* noticion of request pool type */
  81         u16     req_len;                /* buf len passing to fw (req + sgl)*/
  82         u32     tgt_id;
  83
  84         u32     tm_tag;
  85         u8      io_cmpl:1;              /* sets to 1 when fw completes IO */
  86         u8      resvd[3];
  87         struct scsi_cmnd *sc;           /* Associated scsi cmd */
  88         struct snic     *snic;          /* Associated snic */
  89         ulong   sge_va;                 /* Pointer to Resp Buffer */
  90         u64     snsbuf_va;
  91
  92         struct snic_host_req *abort_req;
  93         struct completion *abts_done;
  94
  95         struct snic_host_req *dr_req;
  96         struct completion *dr_done;
  97 };
  98
  99
 100 #define rqi_to_req(rqi) \
 101         ((struct snic_host_req *) (((struct snic_req_info *)rqi)->req))
 102
 103 #define req_to_rqi(req) \
 104         ((struct snic_req_info *) (((struct snic_host_req *)req)->hdr.init_ctx))
 105
 106 #define req_to_sgl(req) \
 107         ((struct snic_sg_desc *) (((struct snic_host_req *)req)+1))
 108
 109 struct snic_req_info *
 110 snic_req_init(struct snic *, int sg_cnt);
 111 void snic_req_free(struct snic *, struct snic_req_info *);
 112 void snic_calc_io_process_time(struct snic *, struct snic_req_info *);
 113 void snic_pci_unmap_rsp_buf(struct snic *, struct snic_req_info *);
 114 struct snic_host_req *
 115 snic_abort_req_init(struct snic *, struct snic_req_info *);
 116 struct snic_host_req *
 117 snic_dr_req_init(struct snic *, struct snic_req_info *);
 118 #endif /* _SNIC_IO_H */