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/*
* This file is part of the Chelsio FCoE driver for Linux.
*
* Copyright (c) 2008-2012 Chelsio Communications, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* 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 __CSIO_SCSI_H__
#define __CSIO_SCSI_H__
#include <linux/spinlock_types.h>
#include <linux/completion.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_tcq.h>
#include <scsi/fc/fc_fcp.h>
#include "csio_defs.h"
#include "csio_wr.h"
extern struct scsi_host_template csio_fcoe_shost_template;
extern struct scsi_host_template csio_fcoe_shost_vport_template;
extern int csio_scsi_eqsize;
extern int csio_scsi_iqlen;
extern int csio_scsi_ioreqs;
extern uint32_t csio_max_scan_tmo;
extern uint32_t csio_delta_scan_tmo;
extern int csio_lun_qdepth;
/*
**************************** NOTE *******************************
* How do we calculate MAX FCoE SCSI SGEs? Here is the math:
* Max Egress WR size = 512 bytes
* One SCSI egress WR has the following fixed no of bytes:
* 48 (sizeof(struct fw_scsi_write[read]_wr)) - FW WR
* + 32 (sizeof(struct fc_fcp_cmnd)) - Immediate FCP_CMD
* ------
* 80
* ------
* That leaves us with 512 - 96 = 432 bytes for data SGE. Using
* struct ulptx_sgl header for the SGE consumes:
* - 4 bytes for cmnd_sge.
* - 12 bytes for the first SGL.
* That leaves us with 416 bytes for the remaining SGE pairs. Which is
* is 416 / 24 (size(struct ulptx_sge_pair)) = 17 SGE pairs,
* or 34 SGEs. Adding the first SGE fetches us 35 SGEs.
*/
#define CSIO_SCSI_MAX_SGE 35
#define CSIO_SCSI_ABRT_TMO_MS 60000
#define CSIO_SCSI_LUNRST_TMO_MS 60000
#define CSIO_SCSI_TM_POLL_MS 2000 /* should be less than
* all TM timeouts.
*/
#define CSIO_SCSI_IQ_WRSZ 128
#define CSIO_SCSI_IQSIZE (csio_scsi_iqlen * CSIO_SCSI_IQ_WRSZ)
#define CSIO_MAX_SNS_LEN 128
#define CSIO_SCSI_RSP_LEN (FCP_RESP_WITH_EXT + 4 + CSIO_MAX_SNS_LEN)
/* Reference to scsi_cmnd */
#define csio_scsi_cmnd(req) ((req)->scratch1)
struct csio_scsi_stats {
uint64_t n_tot_success; /* Total number of good I/Os */
uint32_t n_rn_nr_error; /* No. of remote-node-not-
* ready errors
*/
uint32_t n_hw_nr_error; /* No. of hw-module-not-
* ready errors
*/
uint32_t n_dmamap_error; /* No. of DMA map erros */
uint32_t n_unsupp_sge_error; /* No. of too-many-SGes
* errors.
*/
uint32_t n_no_req_error; /* No. of Out-of-ioreqs error */
uint32_t n_busy_error; /* No. of -EBUSY errors */
uint32_t n_hosterror; /* No. of FW_HOSTERROR I/O */
uint32_t n_rsperror; /* No. of response errors */
uint32_t n_autosense; /* No. of auto sense replies */
uint32_t n_ovflerror; /* No. of overflow errors */
uint32_t n_unflerror; /* No. of underflow errors */
uint32_t n_rdev_nr_error;/* No. of rdev not
* ready errors
*/
uint32_t n_rdev_lost_error;/* No. of rdev lost errors */
uint32_t n_rdev_logo_error;/* No. of rdev logo errors */
uint32_t n_link_down_error;/* No. of link down errors */
uint32_t n_no_xchg_error; /* No. no exchange error */
uint32_t n_unknown_error;/* No. of unhandled errors */
uint32_t n_aborted; /* No. of aborted I/Os */
uint32_t n_abrt_timedout; /* No. of abort timedouts */
uint32_t n_abrt_fail; /* No. of abort failures */
uint32_t n_abrt_dups; /* No. of duplicate aborts */
uint32_t n_abrt_race_comp; /* No. of aborts that raced
* with completions.
*/
uint32_t n_abrt_busy_error;/* No. of abort failures
* due to -EBUSY.
*/
uint32_t n_closed; /* No. of closed I/Os */
uint32_t n_cls_busy_error; /* No. of close failures
* due to -EBUSY.
*/
uint32_t n_active; /* No. of IOs in active_q */
uint32_t n_tm_active; /* No. of TMs in active_q */
uint32_t n_wcbfn; /* No. of I/Os in worker
* cbfn q
*/
uint32_t n_free_ioreq; /* No. of freelist entries */
uint32_t n_free_ddp; /* No. of DDP freelist */
uint32_t n_unaligned; /* No. of Unaligned SGls */
uint32_t n_inval_cplop; /* No. invalid CPL op's in IQ */
uint32_t n_inval_scsiop; /* No. invalid scsi op's in IQ*/
};
struct csio_scsim {
struct csio_hw *hw; /* Pointer to HW moduel */
uint8_t max_sge; /* Max SGE */
uint8_t proto_cmd_len; /* Proto specific SCSI
* cmd length
*/
uint16_t proto_rsp_len; /* Proto specific SCSI
* response length
*/
spinlock_t freelist_lock; /* Lock for ioreq freelist */
struct list_head active_q; /* Outstanding SCSI I/Os */
struct list_head ioreq_freelist; /* Free list of ioreq's */
struct list_head ddp_freelist; /* DDP descriptor freelist */
struct csio_scsi_stats stats; /* This module's statistics */
};
/* State machine defines */
enum csio_scsi_ev {
CSIO_SCSIE_START_IO = 1, /* Start a regular SCSI IO */
CSIO_SCSIE_START_TM, /* Start a TM IO */
CSIO_SCSIE_COMPLETED, /* IO Completed */
CSIO_SCSIE_ABORT, /* Abort IO */
CSIO_SCSIE_ABORTED, /* IO Aborted */
CSIO_SCSIE_CLOSE, /* Close exchange */
CSIO_SCSIE_CLOSED, /* Exchange closed */
CSIO_SCSIE_DRVCLEANUP, /* Driver wants to manually
* cleanup this I/O.
*/
};
enum csio_scsi_lev {
CSIO_LEV_ALL = 1,
CSIO_LEV_LNODE,
CSIO_LEV_RNODE,
CSIO_LEV_LUN,
};
struct csio_scsi_level_data {
enum csio_scsi_lev level;
struct csio_rnode *rnode;
struct csio_lnode *lnode;
uint64_t oslun;
};
static inline struct csio_ioreq *
csio_get_scsi_ioreq(struct csio_scsim *scm)
{
struct csio_sm *req;
if (likely(!list_empty(&scm->ioreq_freelist))) {
req = list_first_entry(&scm->ioreq_freelist,
struct csio_sm, sm_list);
list_del_init(&req->sm_list);
CSIO_DEC_STATS(scm, n_free_ioreq);
return (struct csio_ioreq *)req;
} else
return NULL;
}
static inline void
csio_put_scsi_ioreq(struct csio_scsim *scm, struct csio_ioreq *ioreq)
{
list_add_tail(&ioreq->sm.sm_list, &scm->ioreq_freelist);
CSIO_INC_STATS(scm, n_free_ioreq);
}
static inline void
csio_put_scsi_ioreq_list(struct csio_scsim *scm, struct list_head *reqlist,
int n)
{
list_splice_init(reqlist, &scm->ioreq_freelist);
scm->stats.n_free_ioreq += n;
}
static inline struct csio_dma_buf *
csio_get_scsi_ddp(struct csio_scsim *scm)
{
struct csio_dma_buf *ddp;
if (likely(!list_empty(&scm->ddp_freelist))) {
ddp = list_first_entry(&scm->ddp_freelist,
struct csio_dma_buf, list);
list_del_init(&ddp->list);
CSIO_DEC_STATS(scm, n_free_ddp);
return ddp;
} else
return NULL;
}
static inline void
csio_put_scsi_ddp(struct csio_scsim *scm, struct csio_dma_buf *ddp)
{
list_add_tail(&ddp->list, &scm->ddp_freelist);
CSIO_INC_STATS(scm, n_free_ddp);
}
static inline void
csio_put_scsi_ddp_list(struct csio_scsim *scm, struct list_head *reqlist,
int n)
{
list_splice_tail_init(reqlist, &scm->ddp_freelist);
scm->stats.n_free_ddp += n;
}
static inline void
csio_scsi_completed(struct csio_ioreq *ioreq, struct list_head *cbfn_q)
{
csio_post_event(&ioreq->sm, CSIO_SCSIE_COMPLETED);
if (csio_list_deleted(&ioreq->sm.sm_list))
list_add_tail(&ioreq->sm.sm_list, cbfn_q);
}
static inline void
csio_scsi_aborted(struct csio_ioreq *ioreq, struct list_head *cbfn_q)
{
csio_post_event(&ioreq->sm, CSIO_SCSIE_ABORTED);
list_add_tail(&ioreq->sm.sm_list, cbfn_q);
}
static inline void
csio_scsi_closed(struct csio_ioreq *ioreq, struct list_head *cbfn_q)
{
csio_post_event(&ioreq->sm, CSIO_SCSIE_CLOSED);
list_add_tail(&ioreq->sm.sm_list, cbfn_q);
}
static inline void
csio_scsi_drvcleanup(struct csio_ioreq *ioreq)
{
csio_post_event(&ioreq->sm, CSIO_SCSIE_DRVCLEANUP);
}
/*
* csio_scsi_start_io - Kick starts the IO SM.
* @req: io request SM.
*
* needs to be called with lock held.
*/
static inline int
csio_scsi_start_io(struct csio_ioreq *ioreq)
{
csio_post_event(&ioreq->sm, CSIO_SCSIE_START_IO);
return ioreq->drv_status;
}
/*
* csio_scsi_start_tm - Kicks off the Task management IO SM.
* @req: io request SM.
*
* needs to be called with lock held.
*/
static inline int
csio_scsi_start_tm(struct csio_ioreq *ioreq)
{
csio_post_event(&ioreq->sm, CSIO_SCSIE_START_TM);
return ioreq->drv_status;
}
/*
* csio_scsi_abort - Abort an IO request
* @req: io request SM.
*
* needs to be called with lock held.
*/
static inline int
csio_scsi_abort(struct csio_ioreq *ioreq)
{
csio_post_event(&ioreq->sm, CSIO_SCSIE_ABORT);
return ioreq->drv_status;
}
/*
* csio_scsi_close - Close an IO request
* @req: io request SM.
*
* needs to be called with lock held.
*/
static inline int
csio_scsi_close(struct csio_ioreq *ioreq)
{
csio_post_event(&ioreq->sm, CSIO_SCSIE_CLOSE);
return ioreq->drv_status;
}
void csio_scsi_cleanup_io_q(struct csio_scsim *, struct list_head *);
int csio_scsim_cleanup_io(struct csio_scsim *, bool abort);
int csio_scsim_cleanup_io_lnode(struct csio_scsim *,
struct csio_lnode *);
struct csio_ioreq *csio_scsi_cmpl_handler(struct csio_hw *, void *, uint32_t,
struct csio_fl_dma_buf *,
void *, uint8_t **);
int csio_scsi_qconfig(struct csio_hw *);
int csio_scsim_init(struct csio_scsim *, struct csio_hw *);
void csio_scsim_exit(struct csio_scsim *);
#endif /* __CSIO_SCSI_H__ */
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