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 */ 105