snic_io.h
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/*
* 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 */