diff options
Diffstat (limited to 'drivers/scsi/snic/snic_io.h')
| -rw-r--r-- | drivers/scsi/snic/snic_io.h | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/drivers/scsi/snic/snic_io.h b/drivers/scsi/snic/snic_io.h new file mode 100644 index 000000000..093d6524c --- /dev/null +++ b/drivers/scsi/snic/snic_io.h @@ -0,0 +1,118 @@ +/* + * 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_IO_H +#define _SNIC_IO_H + +#define SNIC_DFLT_SG_DESC_CNT 32 /* Default descriptors for sgl */ +#define SNIC_MAX_SG_DESC_CNT 60 /* Max descriptor for sgl */ +#define SNIC_SG_DESC_ALIGN 16 /* Descriptor address alignment */ + +/* SG descriptor for snic */ +struct snic_sg_desc { + __le64 addr; + __le32 len; + u32 _resvd; +}; + +struct snic_dflt_sgl { + struct snic_sg_desc sg_desc[SNIC_DFLT_SG_DESC_CNT]; +}; + +struct snic_max_sgl { + struct snic_sg_desc sg_desc[SNIC_MAX_SG_DESC_CNT]; +}; + +enum snic_req_cache_type { + SNIC_REQ_CACHE_DFLT_SGL = 0, /* cache with default size sgl */ + SNIC_REQ_CACHE_MAX_SGL, /* cache with max size sgl */ + SNIC_REQ_TM_CACHE, /* cache for task mgmt reqs contains + snic_host_req objects only*/ + SNIC_REQ_MAX_CACHES /* number of sgl caches */ +}; + +/* Per IO internal state */ +struct snic_internal_io_state { + char *rqi; + u64 flags; + u32 state; + u32 abts_status; /* Abort completion status */ + u32 lr_status; /* device reset completion status */ +}; + +/* IO state machine */ +enum snic_ioreq_state { + SNIC_IOREQ_NOT_INITED = 0, + SNIC_IOREQ_PENDING, + SNIC_IOREQ_ABTS_PENDING, + SNIC_IOREQ_ABTS_COMPLETE, + SNIC_IOREQ_LR_PENDING, + SNIC_IOREQ_LR_COMPLETE, + SNIC_IOREQ_COMPLETE, +}; + +struct snic; +struct snic_host_req; + +/* + * snic_req_info : Contains info about IO, one per scsi command. + * Notes: Make sure that the structure is aligned to 16 B + * this helps in easy access to snic_req_info from snic_host_req + */ +struct snic_req_info { + struct list_head list; + struct snic_host_req *req; + u64 start_time; /* start time in jiffies */ + u16 rq_pool_type; /* noticion of request pool type */ + u16 req_len; /* buf len passing to fw (req + sgl)*/ + u32 tgt_id; + + u32 tm_tag; + u8 io_cmpl:1; /* sets to 1 when fw completes IO */ + u8 resvd[3]; + struct scsi_cmnd *sc; /* Associated scsi cmd */ + struct snic *snic; /* Associated snic */ + ulong sge_va; /* Pointer to Resp Buffer */ + u64 snsbuf_va; + + struct snic_host_req *abort_req; + struct completion *abts_done; + + struct snic_host_req *dr_req; + struct completion *dr_done; +}; + + +#define rqi_to_req(rqi) \ + ((struct snic_host_req *) (((struct snic_req_info *)rqi)->req)) + +#define req_to_rqi(req) \ + ((struct snic_req_info *) (((struct snic_host_req *)req)->hdr.init_ctx)) + +#define req_to_sgl(req) \ + ((struct snic_sg_desc *) (((struct snic_host_req *)req)+1)) + +struct snic_req_info * +snic_req_init(struct snic *, int sg_cnt); +void snic_req_free(struct snic *, struct snic_req_info *); +void snic_calc_io_process_time(struct snic *, struct snic_req_info *); +void snic_pci_unmap_rsp_buf(struct snic *, struct snic_req_info *); +struct snic_host_req * +snic_abort_req_init(struct snic *, struct snic_req_info *); +struct snic_host_req * +snic_dr_req_init(struct snic *, struct snic_req_info *); +#endif /* _SNIC_IO_H */ |