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