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linux/drivers/scsi/snic/snic_scsi.c
Narsimhulu Musini 0da8519b2b snic: Fixing race in the hba reset and IO/TM completion 
While HBA reset is in progress, if IO/TM completion is received for the
same IO then IO/TM completion path releases the driver private resources
associated with IO. This fix prevents releasing the resources in
IO and TM completion path if HBA reset is in progress.

Signed-off-by: Narsimhulu Musini <nmusini@cisco.com>
Signed-off-by: Sesidhar Baddela <sebaddel@cisco.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-04-11 16:57:09 -04:00

2675 lines
67 KiB
C
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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.
*/
#include <linux/mempool.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/workqueue.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/gfp.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_dbg.h>
#include "snic_io.h"
#include "snic.h"
#define snic_cmd_tag(sc) (((struct scsi_cmnd *) sc)->request->tag)
const char *snic_state_str[] = {
[SNIC_INIT] = "SNIC_INIT",
[SNIC_ERROR] = "SNIC_ERROR",
[SNIC_ONLINE] = "SNIC_ONLINE",
[SNIC_OFFLINE] = "SNIC_OFFLINE",
[SNIC_FWRESET] = "SNIC_FWRESET",
};
static const char * const snic_req_state_str[] = {
[SNIC_IOREQ_NOT_INITED] = "SNIC_IOREQ_NOT_INITED",
[SNIC_IOREQ_PENDING] = "SNIC_IOREQ_PENDING",
[SNIC_IOREQ_ABTS_PENDING] = "SNIC_IOREQ_ABTS_PENDING",
[SNIC_IOREQ_ABTS_COMPLETE] = "SNIC_IOREQ_ABTS_COMPELTE",
[SNIC_IOREQ_LR_PENDING] = "SNIC_IOREQ_LR_PENDING",
[SNIC_IOREQ_LR_COMPLETE] = "SNIC_IOREQ_LR_COMPELTE",
[SNIC_IOREQ_COMPLETE] = "SNIC_IOREQ_CMD_COMPELTE",
};
/* snic cmd status strings */
static const char * const snic_io_status_str[] = {
[SNIC_STAT_IO_SUCCESS] = "SNIC_STAT_IO_SUCCESS", /* 0x0 */
[SNIC_STAT_INVALID_HDR] = "SNIC_STAT_INVALID_HDR",
[SNIC_STAT_OUT_OF_RES] = "SNIC_STAT_OUT_OF_RES",
[SNIC_STAT_INVALID_PARM] = "SNIC_STAT_INVALID_PARM",
[SNIC_STAT_REQ_NOT_SUP] = "SNIC_STAT_REQ_NOT_SUP",
[SNIC_STAT_IO_NOT_FOUND] = "SNIC_STAT_IO_NOT_FOUND",
[SNIC_STAT_ABORTED] = "SNIC_STAT_ABORTED",
[SNIC_STAT_TIMEOUT] = "SNIC_STAT_TIMEOUT",
[SNIC_STAT_SGL_INVALID] = "SNIC_STAT_SGL_INVALID",
[SNIC_STAT_DATA_CNT_MISMATCH] = "SNIC_STAT_DATA_CNT_MISMATCH",
[SNIC_STAT_FW_ERR] = "SNIC_STAT_FW_ERR",
[SNIC_STAT_ITMF_REJECT] = "SNIC_STAT_ITMF_REJECT",
[SNIC_STAT_ITMF_FAIL] = "SNIC_STAT_ITMF_FAIL",
[SNIC_STAT_ITMF_INCORRECT_LUN] = "SNIC_STAT_ITMF_INCORRECT_LUN",
[SNIC_STAT_CMND_REJECT] = "SNIC_STAT_CMND_REJECT",
[SNIC_STAT_DEV_OFFLINE] = "SNIC_STAT_DEV_OFFLINE",
[SNIC_STAT_NO_BOOTLUN] = "SNIC_STAT_NO_BOOTLUN",
[SNIC_STAT_SCSI_ERR] = "SNIC_STAT_SCSI_ERR",
[SNIC_STAT_NOT_READY] = "SNIC_STAT_NOT_READY",
[SNIC_STAT_FATAL_ERROR] = "SNIC_STAT_FATAL_ERROR",
};
static void snic_scsi_cleanup(struct snic *, int);
const char *
snic_state_to_str(unsigned int state)
{
if (state >= ARRAY_SIZE(snic_state_str) || !snic_state_str[state])
return "Unknown";
return snic_state_str[state];
}
static const char *
snic_io_status_to_str(unsigned int state)
{
if ((state >= ARRAY_SIZE(snic_io_status_str)) ||
(!snic_io_status_str[state]))
return "Unknown";
return snic_io_status_str[state];
}
static const char *
snic_ioreq_state_to_str(unsigned int state)
{
if (state >= ARRAY_SIZE(snic_req_state_str) ||
!snic_req_state_str[state])
return "Unknown";
return snic_req_state_str[state];
}
static inline spinlock_t *
snic_io_lock_hash(struct snic *snic, struct scsi_cmnd *sc)
{
u32 hash = snic_cmd_tag(sc) & (SNIC_IO_LOCKS - 1);
return &snic->io_req_lock[hash];
}
static inline spinlock_t *
snic_io_lock_tag(struct snic *snic, int tag)
{
return &snic->io_req_lock[tag & (SNIC_IO_LOCKS - 1)];
}
/* snic_release_req_buf : Releases snic_req_info */
static void
snic_release_req_buf(struct snic *snic,
struct snic_req_info *rqi,
struct scsi_cmnd *sc)
{
struct snic_host_req *req = rqi_to_req(rqi);
/* Freeing cmd without marking completion, not okay */
SNIC_BUG_ON(!((CMD_STATE(sc) == SNIC_IOREQ_COMPLETE) ||
(CMD_STATE(sc) == SNIC_IOREQ_ABTS_COMPLETE) ||
(CMD_FLAGS(sc) & SNIC_DEV_RST_NOTSUP) ||
(CMD_FLAGS(sc) & SNIC_IO_INTERNAL_TERM_ISSUED) ||
(CMD_FLAGS(sc) & SNIC_DEV_RST_TERM_ISSUED) ||
(CMD_FLAGS(sc) & SNIC_SCSI_CLEANUP) ||
(CMD_STATE(sc) == SNIC_IOREQ_LR_COMPLETE)));
SNIC_SCSI_DBG(snic->shost,
"Rel_req:sc %p:tag %x:rqi %p:ioreq %p:abt %p:dr %p: state %s:flags 0x%llx\n",
sc, snic_cmd_tag(sc), rqi, rqi->req, rqi->abort_req,
rqi->dr_req, snic_ioreq_state_to_str(CMD_STATE(sc)),
CMD_FLAGS(sc));
if (req->u.icmnd.sense_addr)
pci_unmap_single(snic->pdev,
le64_to_cpu(req->u.icmnd.sense_addr),
SCSI_SENSE_BUFFERSIZE,
PCI_DMA_FROMDEVICE);
scsi_dma_unmap(sc);
snic_req_free(snic, rqi);
} /* end of snic_release_req_buf */
/*
* snic_queue_icmnd_req : Queues snic_icmnd request
*/
static int
snic_queue_icmnd_req(struct snic *snic,
struct snic_req_info *rqi,
struct scsi_cmnd *sc,
int sg_cnt)
{
struct scatterlist *sg;
struct snic_sg_desc *sgd;
dma_addr_t pa = 0;
struct scsi_lun lun;
u16 flags = 0;
int ret = 0;
unsigned int i;
if (sg_cnt) {
flags = SNIC_ICMND_ESGL;
sgd = (struct snic_sg_desc *) req_to_sgl(rqi->req);
for_each_sg(scsi_sglist(sc), sg, sg_cnt, i) {
sgd->addr = cpu_to_le64(sg_dma_address(sg));
sgd->len = cpu_to_le32(sg_dma_len(sg));
sgd->_resvd = 0;
sgd++;
}
}
pa = pci_map_single(snic->pdev,
sc->sense_buffer,
SCSI_SENSE_BUFFERSIZE,
PCI_DMA_FROMDEVICE);
if (pci_dma_mapping_error(snic->pdev, pa)) {
SNIC_HOST_ERR(snic->shost,
"QIcmnd:PCI Map Failed for sns buf %p tag %x\n",
sc->sense_buffer, snic_cmd_tag(sc));
ret = -ENOMEM;
return ret;
}
int_to_scsilun(sc->device->lun, &lun);
if (sc->sc_data_direction == DMA_FROM_DEVICE)
flags |= SNIC_ICMND_RD;
if (sc->sc_data_direction == DMA_TO_DEVICE)
flags |= SNIC_ICMND_WR;
/* Initialize icmnd */
snic_icmnd_init(rqi->req,
snic_cmd_tag(sc),
snic->config.hid, /* hid */
(ulong) rqi,
flags, /* command flags */
rqi->tgt_id,
lun.scsi_lun,
sc->cmnd,
sc->cmd_len,
scsi_bufflen(sc),
sg_cnt,
(ulong) req_to_sgl(rqi->req),
pa, /* sense buffer pa */
SCSI_SENSE_BUFFERSIZE);
atomic64_inc(&snic->s_stats.io.active);
ret = snic_queue_wq_desc(snic, rqi->req, rqi->req_len);
if (ret) {
atomic64_dec(&snic->s_stats.io.active);
SNIC_HOST_ERR(snic->shost,
"QIcmnd: Queuing Icmnd Failed. ret = %d\n",
ret);
} else
snic_stats_update_active_ios(&snic->s_stats);
return ret;
} /* end of snic_queue_icmnd_req */
/*
* snic_issue_scsi_req : Prepares IO request and Issues to FW.
*/
static int
snic_issue_scsi_req(struct snic *snic,
struct snic_tgt *tgt,
struct scsi_cmnd *sc)
{
struct snic_req_info *rqi = NULL;
int sg_cnt = 0;
int ret = 0;
u32 tag = snic_cmd_tag(sc);
u64 cmd_trc = 0, cmd_st_flags = 0;
spinlock_t *io_lock = NULL;
unsigned long flags;
CMD_STATE(sc) = SNIC_IOREQ_NOT_INITED;
CMD_FLAGS(sc) = SNIC_NO_FLAGS;
sg_cnt = scsi_dma_map(sc);
if (sg_cnt < 0) {
SNIC_TRC((u16)snic->shost->host_no, tag, (ulong) sc, 0,
sc->cmnd[0], sg_cnt, CMD_STATE(sc));
SNIC_HOST_ERR(snic->shost, "issue_sc:Failed to map SG List.\n");
ret = -ENOMEM;
goto issue_sc_end;
}
rqi = snic_req_init(snic, sg_cnt);
if (!rqi) {
scsi_dma_unmap(sc);
ret = -ENOMEM;
goto issue_sc_end;
}
rqi->tgt_id = tgt->id;
rqi->sc = sc;
CMD_STATE(sc) = SNIC_IOREQ_PENDING;
CMD_SP(sc) = (char *) rqi;
cmd_trc = SNIC_TRC_CMD(sc);
CMD_FLAGS(sc) |= (SNIC_IO_INITIALIZED | SNIC_IO_ISSUED);
cmd_st_flags = SNIC_TRC_CMD_STATE_FLAGS(sc);
io_lock = snic_io_lock_hash(snic, sc);
/* create wq desc and enqueue it */
ret = snic_queue_icmnd_req(snic, rqi, sc, sg_cnt);
if (ret) {
SNIC_HOST_ERR(snic->shost,
"issue_sc: icmnd qing Failed for sc %p, err %d\n",
sc, ret);
spin_lock_irqsave(io_lock, flags);
rqi = (struct snic_req_info *) CMD_SP(sc);
CMD_SP(sc) = NULL;
CMD_STATE(sc) = SNIC_IOREQ_COMPLETE;
CMD_FLAGS(sc) &= ~SNIC_IO_ISSUED; /* turn off the flag */
spin_unlock_irqrestore(io_lock, flags);
if (rqi)
snic_release_req_buf(snic, rqi, sc);
SNIC_TRC(snic->shost->host_no, tag, (ulong) sc, 0, 0, 0,
SNIC_TRC_CMD_STATE_FLAGS(sc));
} else {
u32 io_sz = scsi_bufflen(sc) >> 9;
u32 qtime = jiffies - rqi->start_time;
struct snic_io_stats *iostats = &snic->s_stats.io;
if (io_sz > atomic64_read(&iostats->max_io_sz))
atomic64_set(&iostats->max_io_sz, io_sz);
if (qtime > atomic64_read(&iostats->max_qtime))
atomic64_set(&iostats->max_qtime, qtime);
SNIC_SCSI_DBG(snic->shost,
"issue_sc:sc %p, tag %d queued to WQ.\n",
sc, tag);
SNIC_TRC(snic->shost->host_no, tag, (ulong) sc, (ulong) rqi,
sg_cnt, cmd_trc, cmd_st_flags);
}
issue_sc_end:
return ret;
} /* end of snic_issue_scsi_req */
/*
* snic_queuecommand
* Routine to send a scsi cdb to LLD
* Called with host_lock held and interrupts disabled
*/
int
snic_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc)
{
struct snic_tgt *tgt = NULL;
struct snic *snic = shost_priv(shost);
int ret;
tgt = starget_to_tgt(scsi_target(sc->device));
ret = snic_tgt_chkready(tgt);
if (ret) {
SNIC_HOST_ERR(shost, "Tgt %p id %d Not Ready.\n", tgt, tgt->id);
atomic64_inc(&snic->s_stats.misc.tgt_not_rdy);
sc->result = ret;
sc->scsi_done(sc);
return 0;
}
if (snic_get_state(snic) != SNIC_ONLINE) {
SNIC_HOST_ERR(shost, "snic state is %s\n",
snic_state_str[snic_get_state(snic)]);
return SCSI_MLQUEUE_HOST_BUSY;
}
atomic_inc(&snic->ios_inflight);
SNIC_SCSI_DBG(shost, "sc %p Tag %d (sc %0x) lun %lld in snic_qcmd\n",
sc, snic_cmd_tag(sc), sc->cmnd[0], sc->device->lun);
memset(scsi_cmd_priv(sc), 0, sizeof(struct snic_internal_io_state));
ret = snic_issue_scsi_req(snic, tgt, sc);
if (ret) {
SNIC_HOST_ERR(shost, "Failed to Q, Scsi Req w/ err %d.\n", ret);
ret = SCSI_MLQUEUE_HOST_BUSY;
}
atomic_dec(&snic->ios_inflight);
return ret;
} /* end of snic_queuecommand */
/*
* snic_process_abts_pending_state:
* caller should hold IO lock
*/
static void
snic_proc_tmreq_pending_state(struct snic *snic,
struct scsi_cmnd *sc,
u8 cmpl_status)
{
int state = CMD_STATE(sc);
if (state == SNIC_IOREQ_ABTS_PENDING)
CMD_FLAGS(sc) |= SNIC_IO_ABTS_PENDING;
else if (state == SNIC_IOREQ_LR_PENDING)
CMD_FLAGS(sc) |= SNIC_DEV_RST_PENDING;
else
SNIC_BUG_ON(1);
switch (cmpl_status) {
case SNIC_STAT_IO_SUCCESS:
CMD_FLAGS(sc) |= SNIC_IO_DONE;
break;
case SNIC_STAT_ABORTED:
CMD_FLAGS(sc) |= SNIC_IO_ABORTED;
break;
default:
SNIC_BUG_ON(1);
}
}
/*
* snic_process_io_failed_state:
* Processes IO's error states
*/
static void
snic_process_io_failed_state(struct snic *snic,
struct snic_icmnd_cmpl *icmnd_cmpl,
struct scsi_cmnd *sc,
u8 cmpl_stat)
{
int res = 0;
switch (cmpl_stat) {
case SNIC_STAT_TIMEOUT: /* Req was timedout */
atomic64_inc(&snic->s_stats.misc.io_tmo);
res = DID_TIME_OUT;
break;
case SNIC_STAT_ABORTED: /* Req was aborted */
atomic64_inc(&snic->s_stats.misc.io_aborted);
res = DID_ABORT;
break;
case SNIC_STAT_DATA_CNT_MISMATCH:/* Recv/Sent more/less data than exp */
atomic64_inc(&snic->s_stats.misc.data_cnt_mismat);
scsi_set_resid(sc, le32_to_cpu(icmnd_cmpl->resid));
res = DID_ERROR;
break;
case SNIC_STAT_OUT_OF_RES: /* Out of resources to complete request */
atomic64_inc(&snic->s_stats.fw.out_of_res);
res = DID_REQUEUE;
break;
case SNIC_STAT_IO_NOT_FOUND: /* Requested I/O was not found */
atomic64_inc(&snic->s_stats.io.io_not_found);
res = DID_ERROR;
break;
case SNIC_STAT_SGL_INVALID: /* Req was aborted to due to sgl error*/
atomic64_inc(&snic->s_stats.misc.sgl_inval);
res = DID_ERROR;
break;
case SNIC_STAT_FW_ERR: /* Req terminated due to FW Error */
atomic64_inc(&snic->s_stats.fw.io_errs);
res = DID_ERROR;
break;
case SNIC_STAT_SCSI_ERR: /* FW hits SCSI Error */
atomic64_inc(&snic->s_stats.fw.scsi_errs);
break;
case SNIC_STAT_NOT_READY: /* XPT yet to initialize */
case SNIC_STAT_DEV_OFFLINE: /* Device offline */
res = DID_NO_CONNECT;
break;
case SNIC_STAT_INVALID_HDR: /* Hdr contains invalid data */
case SNIC_STAT_INVALID_PARM: /* Some param in req is invalid */
case SNIC_STAT_REQ_NOT_SUP: /* Req type is not supported */
case SNIC_STAT_CMND_REJECT: /* Req rejected */
case SNIC_STAT_FATAL_ERROR: /* XPT Error */
default:
SNIC_SCSI_DBG(snic->shost,
"Invalid Hdr/Param or Req Not Supported or Cmnd Rejected or Device Offline. or Unknown\n");
res = DID_ERROR;
break;
}
SNIC_HOST_ERR(snic->shost, "fw returns failed status %s flags 0x%llx\n",
snic_io_status_to_str(cmpl_stat), CMD_FLAGS(sc));
/* Set sc->result */
sc->result = (res << 16) | icmnd_cmpl->scsi_status;
} /* end of snic_process_io_failed_state */
/*
* snic_tmreq_pending : is task management in progress.
*/
static int
snic_tmreq_pending(struct scsi_cmnd *sc)
{
int state = CMD_STATE(sc);
return ((state == SNIC_IOREQ_ABTS_PENDING) ||
(state == SNIC_IOREQ_LR_PENDING));
}
/*
* snic_process_icmnd_cmpl_status:
* Caller should hold io_lock
*/
static int
snic_process_icmnd_cmpl_status(struct snic *snic,
struct snic_icmnd_cmpl *icmnd_cmpl,
u8 cmpl_stat,
struct scsi_cmnd *sc)
{
u8 scsi_stat = icmnd_cmpl->scsi_status;
u64 xfer_len = 0;
int ret = 0;
/* Mark the IO as complete */
CMD_STATE(sc) = SNIC_IOREQ_COMPLETE;
if (likely(cmpl_stat == SNIC_STAT_IO_SUCCESS)) {
sc->result = (DID_OK << 16) | scsi_stat;
xfer_len = scsi_bufflen(sc);
/* Update SCSI Cmd with resid value */
scsi_set_resid(sc, le32_to_cpu(icmnd_cmpl->resid));
if (icmnd_cmpl->flags & SNIC_ICMND_CMPL_UNDR_RUN) {
xfer_len -= le32_to_cpu(icmnd_cmpl->resid);
atomic64_inc(&snic->s_stats.misc.io_under_run);
}
if (icmnd_cmpl->scsi_status == SAM_STAT_TASK_SET_FULL)
atomic64_inc(&snic->s_stats.misc.qfull);
ret = 0;
} else {
snic_process_io_failed_state(snic, icmnd_cmpl, sc, cmpl_stat);
atomic64_inc(&snic->s_stats.io.fail);
SNIC_HOST_ERR(snic->shost,
"icmnd_cmpl: IO Failed : Hdr Status %s flags 0x%llx\n",
snic_io_status_to_str(cmpl_stat), CMD_FLAGS(sc));
ret = 1;
}
return ret;
} /* end of snic_process_icmnd_cmpl_status */
/*
* snic_icmnd_cmpl_handler
* Routine to handle icmnd completions
*/
static void
snic_icmnd_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq)
{
u8 typ, hdr_stat;
u32 cmnd_id, hid;
ulong ctx;
struct scsi_cmnd *sc = NULL;
struct snic_icmnd_cmpl *icmnd_cmpl = NULL;
struct snic_host_req *req = NULL;
struct snic_req_info *rqi = NULL;
unsigned long flags, start_time;
spinlock_t *io_lock;
u8 sc_stat = 0;
snic_io_hdr_dec(&fwreq->hdr, &typ, &hdr_stat, &cmnd_id, &hid, &ctx);
icmnd_cmpl = &fwreq->u.icmnd_cmpl;
sc_stat = icmnd_cmpl->scsi_status;
SNIC_SCSI_DBG(snic->shost,
"Icmnd_cmpl: type = %x, hdr_stat = %x, cmnd_id = %x, hid = %x,i ctx = %lx\n",
typ, hdr_stat, cmnd_id, hid, ctx);
if (cmnd_id >= snic->max_tag_id) {
SNIC_HOST_ERR(snic->shost,
"Icmnd_cmpl:Tag Error:Out of Range Tag %d, hdr status = %s\n",
cmnd_id, snic_io_status_to_str(hdr_stat));
return;
}
sc = scsi_host_find_tag(snic->shost, cmnd_id);
WARN_ON_ONCE(!sc);
if (!sc) {
atomic64_inc(&snic->s_stats.io.sc_null);
SNIC_HOST_ERR(snic->shost,
"Icmnd_cmpl: Scsi Cmnd Not found, sc = NULL Hdr Status = %s tag = 0x%x fwreq = 0x%p\n",
snic_io_status_to_str(hdr_stat),
cmnd_id,
fwreq);
SNIC_TRC(snic->shost->host_no, cmnd_id, 0,
((u64)hdr_stat << 16 |
(u64)sc_stat << 8 | (u64)icmnd_cmpl->flags),
(ulong) fwreq, le32_to_cpu(icmnd_cmpl->resid), ctx);
return;
}
io_lock = snic_io_lock_hash(snic, sc);
spin_lock_irqsave(io_lock, flags);
rqi = (struct snic_req_info *) CMD_SP(sc);
SNIC_SCSI_DBG(snic->shost,
"Icmnd_cmpl:lun %lld sc %p cmd %xtag %d flags 0x%llx rqi %p\n",
sc->device->lun, sc, sc->cmnd[0], snic_cmd_tag(sc),
CMD_FLAGS(sc), rqi);
if (CMD_FLAGS(sc) & SNIC_HOST_RESET_CMD_TERM) {
spin_unlock_irqrestore(io_lock, flags);
return;
}
SNIC_BUG_ON(rqi != (struct snic_req_info *)ctx);
WARN_ON_ONCE(req);
if (!rqi) {
atomic64_inc(&snic->s_stats.io.req_null);
CMD_FLAGS(sc) |= SNIC_IO_REQ_NULL;
spin_unlock_irqrestore(io_lock, flags);
SNIC_HOST_ERR(snic->shost,
"Icmnd_cmpl:Host Req Not Found(null), Hdr Status %s, Tag 0x%x, sc 0x%p flags 0x%llx\n",
snic_io_status_to_str(hdr_stat),
cmnd_id, sc, CMD_FLAGS(sc));
return;
}
rqi = (struct snic_req_info *) ctx;
start_time = rqi->start_time;
/* firmware completed the io */
rqi->io_cmpl = 1;
/*
* if SCSI-ML has already issued abort on this command,
* ignore completion of the IO. The abts path will clean it up
*/
if (unlikely(snic_tmreq_pending(sc))) {
snic_proc_tmreq_pending_state(snic, sc, hdr_stat);
spin_unlock_irqrestore(io_lock, flags);
snic_stats_update_io_cmpl(&snic->s_stats);
/* Expected value is SNIC_STAT_ABORTED */
if (likely(hdr_stat == SNIC_STAT_ABORTED))
return;
SNIC_SCSI_DBG(snic->shost,
"icmnd_cmpl:TM Req Pending(%s), Hdr Status %s sc 0x%p scsi status %x resid %d flags 0x%llx\n",
snic_ioreq_state_to_str(CMD_STATE(sc)),
snic_io_status_to_str(hdr_stat),
sc, sc_stat, le32_to_cpu(icmnd_cmpl->resid),
CMD_FLAGS(sc));
SNIC_TRC(snic->shost->host_no, cmnd_id, (ulong) sc,
jiffies_to_msecs(jiffies - start_time), (ulong) fwreq,
SNIC_TRC_CMD(sc), SNIC_TRC_CMD_STATE_FLAGS(sc));
return;
}
if (snic_process_icmnd_cmpl_status(snic, icmnd_cmpl, hdr_stat, sc)) {
scsi_print_command(sc);
SNIC_HOST_ERR(snic->shost,
"icmnd_cmpl:IO Failed, sc 0x%p Tag %d Cmd %x Hdr Status %s flags 0x%llx\n",
sc, sc->cmnd[0], cmnd_id,
snic_io_status_to_str(hdr_stat), CMD_FLAGS(sc));
}
/* Break link with the SCSI Command */
CMD_SP(sc) = NULL;
CMD_FLAGS(sc) |= SNIC_IO_DONE;
spin_unlock_irqrestore(io_lock, flags);
/* For now, consider only successful IO. */
snic_calc_io_process_time(snic, rqi);
snic_release_req_buf(snic, rqi, sc);
SNIC_TRC(snic->shost->host_no, cmnd_id, (ulong) sc,
jiffies_to_msecs(jiffies - start_time), (ulong) fwreq,
SNIC_TRC_CMD(sc), SNIC_TRC_CMD_STATE_FLAGS(sc));
if (sc->scsi_done)
sc->scsi_done(sc);
snic_stats_update_io_cmpl(&snic->s_stats);
} /* end of snic_icmnd_cmpl_handler */
static void
snic_proc_dr_cmpl_locked(struct snic *snic,
struct snic_fw_req *fwreq,
u8 cmpl_stat,
u32 cmnd_id,
struct scsi_cmnd *sc)
{
struct snic_req_info *rqi = (struct snic_req_info *) CMD_SP(sc);
u32 start_time = rqi->start_time;
CMD_LR_STATUS(sc) = cmpl_stat;
SNIC_SCSI_DBG(snic->shost, "itmf_cmpl: Cmd State = %s\n",
snic_ioreq_state_to_str(CMD_STATE(sc)));
if (CMD_STATE(sc) == SNIC_IOREQ_ABTS_PENDING) {
CMD_FLAGS(sc) |= SNIC_DEV_RST_ABTS_PENDING;
SNIC_TRC(snic->shost->host_no, cmnd_id, (ulong) sc,
jiffies_to_msecs(jiffies - start_time),
(ulong) fwreq, 0, SNIC_TRC_CMD_STATE_FLAGS(sc));
SNIC_SCSI_DBG(snic->shost,
"itmf_cmpl: Terminate Pending Dev Reset Cmpl Recvd.id %x, status %s flags 0x%llx\n",
(int)(cmnd_id & SNIC_TAG_MASK),
snic_io_status_to_str(cmpl_stat),
CMD_FLAGS(sc));
return;
}
if (CMD_FLAGS(sc) & SNIC_DEV_RST_TIMEDOUT) {
SNIC_TRC(snic->shost->host_no, cmnd_id, (ulong) sc,
jiffies_to_msecs(jiffies - start_time),
(ulong) fwreq, 0, SNIC_TRC_CMD_STATE_FLAGS(sc));
SNIC_SCSI_DBG(snic->shost,
"itmf_cmpl:Dev Reset Completion Received after timeout. id %d cmpl status %s flags 0x%llx\n",
(int)(cmnd_id & SNIC_TAG_MASK),
snic_io_status_to_str(cmpl_stat),
CMD_FLAGS(sc));
return;
}
CMD_STATE(sc) = SNIC_IOREQ_LR_COMPLETE;
CMD_FLAGS(sc) |= SNIC_DEV_RST_DONE;
SNIC_SCSI_DBG(snic->shost,
"itmf_cmpl:Dev Reset Cmpl Recvd id %d cmpl status %s flags 0x%llx\n",
(int)(cmnd_id & SNIC_TAG_MASK),
snic_io_status_to_str(cmpl_stat),
CMD_FLAGS(sc));
if (rqi->dr_done)
complete(rqi->dr_done);
} /* end of snic_proc_dr_cmpl_locked */
/*
* snic_update_abort_stats : Updates abort stats based on completion status.
*/
static void
snic_update_abort_stats(struct snic *snic, u8 cmpl_stat)
{
struct snic_abort_stats *abt_stats = &snic->s_stats.abts;
SNIC_SCSI_DBG(snic->shost, "Updating Abort stats.\n");
switch (cmpl_stat) {
case SNIC_STAT_IO_SUCCESS:
break;
case SNIC_STAT_TIMEOUT:
atomic64_inc(&abt_stats->fw_tmo);
break;
case SNIC_STAT_IO_NOT_FOUND:
atomic64_inc(&abt_stats->io_not_found);
break;
default:
atomic64_inc(&abt_stats->fail);
break;
}
}
static int
snic_process_itmf_cmpl(struct snic *snic,
struct snic_fw_req *fwreq,
u32 cmnd_id,
u8 cmpl_stat,
struct scsi_cmnd *sc)
{
struct snic_req_info *rqi = NULL;
u32 tm_tags = 0;
spinlock_t *io_lock = NULL;
unsigned long flags;
u32 start_time = 0;
int ret = 0;
io_lock = snic_io_lock_hash(snic, sc);
spin_lock_irqsave(io_lock, flags);
if (CMD_FLAGS(sc) & SNIC_HOST_RESET_CMD_TERM) {
spin_unlock_irqrestore(io_lock, flags);
return ret;
}
rqi = (struct snic_req_info *) CMD_SP(sc);
WARN_ON_ONCE(!rqi);
if (!rqi) {
atomic64_inc(&snic->s_stats.io.req_null);
spin_unlock_irqrestore(io_lock, flags);
CMD_FLAGS(sc) |= SNIC_IO_ABTS_TERM_REQ_NULL;
SNIC_HOST_ERR(snic->shost,
"itmf_cmpl: rqi is null,Hdr stat = %s Tag = 0x%x sc = 0x%p flags 0x%llx\n",
snic_io_status_to_str(cmpl_stat), cmnd_id, sc,
CMD_FLAGS(sc));
return ret;
}
/* Extract task management flags */
tm_tags = cmnd_id & ~(SNIC_TAG_MASK);
start_time = rqi->start_time;
cmnd_id &= (SNIC_TAG_MASK);
switch (tm_tags) {
case SNIC_TAG_ABORT:
/* Abort only issued on cmd */
snic_update_abort_stats(snic, cmpl_stat);
if (CMD_STATE(sc) != SNIC_IOREQ_ABTS_PENDING) {
/* This is a late completion. Ignore it. */
ret = -1;
spin_unlock_irqrestore(io_lock, flags);
break;
}
CMD_STATE(sc) = SNIC_IOREQ_ABTS_COMPLETE;
CMD_ABTS_STATUS(sc) = cmpl_stat;
CMD_FLAGS(sc) |= SNIC_IO_ABTS_TERM_DONE;
SNIC_SCSI_DBG(snic->shost,
"itmf_cmpl:Abort Cmpl Recvd.Tag 0x%x Status %s flags 0x%llx\n",
cmnd_id,
snic_io_status_to_str(cmpl_stat),
CMD_FLAGS(sc));
/*
* If scsi_eh thread is blocked waiting for abts complete,
* signal completion to it. IO will be cleaned in the thread,
* else clean it in this context.
*/
if (rqi->abts_done) {
complete(rqi->abts_done);
spin_unlock_irqrestore(io_lock, flags);
break; /* jump out */
}
CMD_SP(sc) = NULL;
sc->result = (DID_ERROR << 16);
SNIC_SCSI_DBG(snic->shost,
"itmf_cmpl: Completing IO. sc %p flags 0x%llx\n",
sc, CMD_FLAGS(sc));
spin_unlock_irqrestore(io_lock, flags);
snic_release_req_buf(snic, rqi, sc);
if (sc->scsi_done) {
SNIC_TRC(snic->shost->host_no, cmnd_id, (ulong) sc,
jiffies_to_msecs(jiffies - start_time),
(ulong) fwreq, SNIC_TRC_CMD(sc),
SNIC_TRC_CMD_STATE_FLAGS(sc));
sc->scsi_done(sc);
}
break;
case SNIC_TAG_DEV_RST:
case SNIC_TAG_DEV_RST | SNIC_TAG_IOCTL_DEV_RST:
snic_proc_dr_cmpl_locked(snic, fwreq, cmpl_stat, cmnd_id, sc);
spin_unlock_irqrestore(io_lock, flags);
ret = 0;
break;
case SNIC_TAG_ABORT | SNIC_TAG_DEV_RST:
/* Abort and terminate completion of device reset req */
CMD_STATE(sc) = SNIC_IOREQ_ABTS_COMPLETE;
CMD_ABTS_STATUS(sc) = cmpl_stat;
CMD_FLAGS(sc) |= SNIC_DEV_RST_DONE;
SNIC_SCSI_DBG(snic->shost,
"itmf_cmpl:dev reset abts cmpl recvd. id %d status %s flags 0x%llx\n",
cmnd_id, snic_io_status_to_str(cmpl_stat),
CMD_FLAGS(sc));
if (rqi->abts_done)
complete(rqi->abts_done);
spin_unlock_irqrestore(io_lock, flags);
break;
default:
spin_unlock_irqrestore(io_lock, flags);
SNIC_HOST_ERR(snic->shost,
"itmf_cmpl: Unknown TM tag bit 0x%x\n", tm_tags);
SNIC_HOST_ERR(snic->shost,
"itmf_cmpl:Unexpected itmf io stat %s Tag = 0x%x flags 0x%llx\n",
snic_ioreq_state_to_str(CMD_STATE(sc)),
cmnd_id,
CMD_FLAGS(sc));
ret = -1;
SNIC_BUG_ON(1);
break;
}
return ret;
} /* end of snic_process_itmf_cmpl_status */
/*
* snic_itmf_cmpl_handler.
* Routine to handle itmf completions.
*/
static void
snic_itmf_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq)
{
struct scsi_cmnd *sc = NULL;
struct snic_req_info *rqi = NULL;
struct snic_itmf_cmpl *itmf_cmpl = NULL;
ulong ctx;
u32 cmnd_id;
u32 hid;
u8 typ;
u8 hdr_stat;
snic_io_hdr_dec(&fwreq->hdr, &typ, &hdr_stat, &cmnd_id, &hid, &ctx);
SNIC_SCSI_DBG(snic->shost,
"Itmf_cmpl: %s: type = %x, hdr_stat = %x, cmnd_id = %x, hid = %x,ctx = %lx\n",
__func__, typ, hdr_stat, cmnd_id, hid, ctx);
itmf_cmpl = &fwreq->u.itmf_cmpl;
SNIC_SCSI_DBG(snic->shost,
"Itmf_cmpl: nterm %u , flags 0x%x\n",
le32_to_cpu(itmf_cmpl->nterminated), itmf_cmpl->flags);
/* spl case, dev reset issued through ioctl */
if (cmnd_id & SNIC_TAG_IOCTL_DEV_RST) {
rqi = (struct snic_req_info *) ctx;
sc = rqi->sc;
goto ioctl_dev_rst;
}
if ((cmnd_id & SNIC_TAG_MASK) >= snic->max_tag_id) {
SNIC_HOST_ERR(snic->shost,
"Itmf_cmpl: Tag 0x%x out of Range,HdrStat %s\n",
cmnd_id, snic_io_status_to_str(hdr_stat));
SNIC_BUG_ON(1);
return;
}
sc = scsi_host_find_tag(snic->shost, cmnd_id & SNIC_TAG_MASK);
WARN_ON_ONCE(!sc);
ioctl_dev_rst:
if (!sc) {
atomic64_inc(&snic->s_stats.io.sc_null);
SNIC_HOST_ERR(snic->shost,
"Itmf_cmpl: sc is NULL - Hdr Stat %s Tag 0x%x\n",
snic_io_status_to_str(hdr_stat), cmnd_id);
return;
}
snic_process_itmf_cmpl(snic, fwreq, cmnd_id, hdr_stat, sc);
} /* end of snic_itmf_cmpl_handler */
static void
snic_hba_reset_scsi_cleanup(struct snic *snic, struct scsi_cmnd *sc)
{
struct snic_stats *st = &snic->s_stats;
long act_ios = 0, act_fwreqs = 0;
SNIC_SCSI_DBG(snic->shost, "HBA Reset scsi cleanup.\n");
snic_scsi_cleanup(snic, snic_cmd_tag(sc));
/* Update stats on pending IOs */
act_ios = atomic64_read(&st->io.active);
atomic64_add(act_ios, &st->io.compl);
atomic64_sub(act_ios, &st->io.active);
act_fwreqs = atomic64_read(&st->fw.actv_reqs);
atomic64_sub(act_fwreqs, &st->fw.actv_reqs);
}
/*
* snic_hba_reset_cmpl_handler :
*
* Notes :
* 1. Cleanup all the scsi cmds, release all snic specific cmds
* 2. Issue Report Targets in case of SAN targets
*/
static int
snic_hba_reset_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq)
{
ulong ctx;
u32 cmnd_id;
u32 hid;
u8 typ;
u8 hdr_stat;
struct scsi_cmnd *sc = NULL;
struct snic_req_info *rqi = NULL;
spinlock_t *io_lock = NULL;
unsigned long flags, gflags;
int ret = 0;
snic_io_hdr_dec(&fwreq->hdr, &typ, &hdr_stat, &cmnd_id, &hid, &ctx);
SNIC_HOST_INFO(snic->shost,
"reset_cmpl:Tag %d ctx %lx cmpl status %s HBA Reset Completion received.\n",
cmnd_id, ctx, snic_io_status_to_str(hdr_stat));
SNIC_SCSI_DBG(snic->shost,
"reset_cmpl: type = %x, hdr_stat = %x, cmnd_id = %x, hid = %x, ctx = %lx\n",
typ, hdr_stat, cmnd_id, hid, ctx);
/* spl case, host reset issued through ioctl */
if (cmnd_id == SCSI_NO_TAG) {
rqi = (struct snic_req_info *) ctx;
SNIC_HOST_INFO(snic->shost,
"reset_cmpl:Tag %d ctx %lx cmpl stat %s\n",
cmnd_id, ctx, snic_io_status_to_str(hdr_stat));
sc = rqi->sc;
goto ioctl_hba_rst;
}
if (cmnd_id >= snic->max_tag_id) {
SNIC_HOST_ERR(snic->shost,
"reset_cmpl: Tag 0x%x out of Range,HdrStat %s\n",
cmnd_id, snic_io_status_to_str(hdr_stat));
SNIC_BUG_ON(1);
return 1;
}
sc = scsi_host_find_tag(snic->shost, cmnd_id);
ioctl_hba_rst:
if (!sc) {
atomic64_inc(&snic->s_stats.io.sc_null);
SNIC_HOST_ERR(snic->shost,
"reset_cmpl: sc is NULL - Hdr Stat %s Tag 0x%x\n",
snic_io_status_to_str(hdr_stat), cmnd_id);
ret = 1;
return ret;
}
SNIC_HOST_INFO(snic->shost,
"reset_cmpl: sc %p rqi %p Tag %d flags 0x%llx\n",
sc, rqi, cmnd_id, CMD_FLAGS(sc));
io_lock = snic_io_lock_hash(snic, sc);
spin_lock_irqsave(io_lock, flags);
if (!snic->remove_wait) {
spin_unlock_irqrestore(io_lock, flags);
SNIC_HOST_ERR(snic->shost,
"reset_cmpl:host reset completed after timout\n");
ret = 1;
return ret;
}
rqi = (struct snic_req_info *) CMD_SP(sc);
WARN_ON_ONCE(!rqi);
if (!rqi) {
atomic64_inc(&snic->s_stats.io.req_null);
spin_unlock_irqrestore(io_lock, flags);
CMD_FLAGS(sc) |= SNIC_IO_ABTS_TERM_REQ_NULL;
SNIC_HOST_ERR(snic->shost,
"reset_cmpl: rqi is null,Hdr stat %s Tag 0x%x sc 0x%p flags 0x%llx\n",
snic_io_status_to_str(hdr_stat), cmnd_id, sc,
CMD_FLAGS(sc));
ret = 1;
return ret;
}
/* stats */
spin_unlock_irqrestore(io_lock, flags);
/* scsi cleanup */
snic_hba_reset_scsi_cleanup(snic, sc);
SNIC_BUG_ON(snic_get_state(snic) != SNIC_OFFLINE &&
snic_get_state(snic) != SNIC_FWRESET);
/* Careful locking between snic_lock and io lock */
spin_lock_irqsave(io_lock, flags);
spin_lock_irqsave(&snic->snic_lock, gflags);
if (snic_get_state(snic) == SNIC_FWRESET)
snic_set_state(snic, SNIC_ONLINE);
spin_unlock_irqrestore(&snic->snic_lock, gflags);
if (snic->remove_wait)
complete(snic->remove_wait);
spin_unlock_irqrestore(io_lock, flags);
atomic64_inc(&snic->s_stats.reset.hba_reset_cmpl);
ret = 0;
/* Rediscovery is for SAN */
if (snic->config.xpt_type == SNIC_DAS)
return ret;
SNIC_SCSI_DBG(snic->shost, "reset_cmpl: Queuing discovery work.\n");
queue_work(snic_glob->event_q, &snic->disc_work);
return ret;
}
static void
snic_msg_ack_handler(struct snic *snic, struct snic_fw_req *fwreq)
{
SNIC_HOST_INFO(snic->shost, "Message Ack Received.\n");
SNIC_ASSERT_NOT_IMPL(1);
}
static void
snic_aen_handler(struct snic *snic, struct snic_fw_req *fwreq)
{
u8 typ, hdr_stat;
u32 cmnd_id, hid;
ulong ctx;
struct snic_async_evnotify *aen = &fwreq->u.async_ev;
u32 event_id = 0;
snic_io_hdr_dec(&fwreq->hdr, &typ, &hdr_stat, &cmnd_id, &hid, &ctx);
SNIC_SCSI_DBG(snic->shost,
"aen: type = %x, hdr_stat = %x, cmnd_id = %x, hid = %x, ctx = %lx\n",
typ, hdr_stat, cmnd_id, hid, ctx);
event_id = le32_to_cpu(aen->ev_id);
switch (event_id) {
case SNIC_EV_TGT_OFFLINE:
SNIC_HOST_INFO(snic->shost, "aen:TGT_OFFLINE Event Recvd.\n");
break;
case SNIC_EV_TGT_ONLINE:
SNIC_HOST_INFO(snic->shost, "aen:TGT_ONLINE Event Recvd.\n");
break;
case SNIC_EV_LUN_OFFLINE:
SNIC_HOST_INFO(snic->shost, "aen:LUN_OFFLINE Event Recvd.\n");
break;
case SNIC_EV_LUN_ONLINE:
SNIC_HOST_INFO(snic->shost, "aen:LUN_ONLINE Event Recvd.\n");
break;
case SNIC_EV_CONF_CHG:
SNIC_HOST_INFO(snic->shost, "aen:Config Change Event Recvd.\n");
break;
case SNIC_EV_TGT_ADDED:
SNIC_HOST_INFO(snic->shost, "aen:TGT_ADD Event Recvd.\n");
break;
case SNIC_EV_TGT_DELTD:
SNIC_HOST_INFO(snic->shost, "aen:TGT_DEL Event Recvd.\n");
break;
case SNIC_EV_LUN_ADDED:
SNIC_HOST_INFO(snic->shost, "aen:LUN_ADD Event Recvd.\n");
break;
case SNIC_EV_LUN_DELTD:
SNIC_HOST_INFO(snic->shost, "aen:LUN_DEL Event Recvd.\n");
break;
case SNIC_EV_DISC_CMPL:
SNIC_HOST_INFO(snic->shost, "aen:DISC_CMPL Event Recvd.\n");
break;
default:
SNIC_HOST_INFO(snic->shost, "aen:Unknown Event Recvd.\n");
SNIC_BUG_ON(1);
break;
}
SNIC_ASSERT_NOT_IMPL(1);
} /* end of snic_aen_handler */
/*
* snic_io_cmpl_handler
* Routine to process CQ entries(IO Completions) posted by fw.
*/
static int
snic_io_cmpl_handler(struct vnic_dev *vdev,
unsigned int cq_idx,
struct snic_fw_req *fwreq)
{
struct snic *snic = svnic_dev_priv(vdev);
u64 start = jiffies, cmpl_time;
snic_print_desc(__func__, (char *)fwreq, sizeof(*fwreq));
/* Update FW Stats */
if ((fwreq->hdr.type >= SNIC_RSP_REPORT_TGTS_CMPL) &&
(fwreq->hdr.type <= SNIC_RSP_BOOT_LUNS_CMPL))
atomic64_dec(&snic->s_stats.fw.actv_reqs);
SNIC_BUG_ON((fwreq->hdr.type > SNIC_RSP_BOOT_LUNS_CMPL) &&
(fwreq->hdr.type < SNIC_MSG_ASYNC_EVNOTIFY));
/* Check for snic subsys errors */
switch (fwreq->hdr.status) {
case SNIC_STAT_NOT_READY: /* XPT yet to initialize */
SNIC_HOST_ERR(snic->shost,
"sNIC SubSystem is NOT Ready.\n");
break;
case SNIC_STAT_FATAL_ERROR: /* XPT Error */
SNIC_HOST_ERR(snic->shost,
"sNIC SubSystem in Unrecoverable State.\n");
break;
}
switch (fwreq->hdr.type) {
case SNIC_RSP_EXCH_VER_CMPL:
snic_io_exch_ver_cmpl_handler(snic, fwreq);
break;
case SNIC_RSP_REPORT_TGTS_CMPL:
snic_report_tgt_cmpl_handler(snic, fwreq);
break;
case SNIC_RSP_ICMND_CMPL:
snic_icmnd_cmpl_handler(snic, fwreq);
break;
case SNIC_RSP_ITMF_CMPL:
snic_itmf_cmpl_handler(snic, fwreq);
break;
case SNIC_RSP_HBA_RESET_CMPL:
snic_hba_reset_cmpl_handler(snic, fwreq);
break;
case SNIC_MSG_ACK:
snic_msg_ack_handler(snic, fwreq);
break;
case SNIC_MSG_ASYNC_EVNOTIFY:
snic_aen_handler(snic, fwreq);
break;
default:
SNIC_BUG_ON(1);
SNIC_SCSI_DBG(snic->shost,
"Unknown Firmwqre completion request type %d\n",
fwreq->hdr.type);
break;
}
/* Update Stats */
cmpl_time = jiffies - start;
if (cmpl_time > atomic64_read(&snic->s_stats.io.max_cmpl_time))
atomic64_set(&snic->s_stats.io.max_cmpl_time, cmpl_time);
return 0;
} /* end of snic_io_cmpl_handler */
/*
* snic_fwcq_cmpl_handler
* Routine to process fwCQ
* This CQ is independent, and not associated with wq/rq/wq_copy queues
*/
int
snic_fwcq_cmpl_handler(struct snic *snic, int io_cmpl_work)
{
unsigned int num_ent = 0; /* number cq entries processed */
unsigned int cq_idx;
unsigned int nent_per_cq;
struct snic_misc_stats *misc_stats = &snic->s_stats.misc;
for (cq_idx = snic->wq_count; cq_idx < snic->cq_count; cq_idx++) {
nent_per_cq = vnic_cq_fw_service(&snic->cq[cq_idx],
snic_io_cmpl_handler,
io_cmpl_work);
num_ent += nent_per_cq;
if (nent_per_cq > atomic64_read(&misc_stats->max_cq_ents))
atomic64_set(&misc_stats->max_cq_ents, nent_per_cq);
}
return num_ent;
} /* end of snic_fwcq_cmpl_handler */
/*
* snic_queue_itmf_req: Common API to queue Task Management requests.
* Use rqi->tm_tag for passing special tags.
* @req_id : aborted request's tag, -1 for lun reset.
*/
static int
snic_queue_itmf_req(struct snic *snic,
struct snic_host_req *tmreq,
struct scsi_cmnd *sc,
u32 tmf,
u32 req_id)
{
struct snic_req_info *rqi = req_to_rqi(tmreq);
struct scsi_lun lun;
int tm_tag = snic_cmd_tag(sc) | rqi->tm_tag;
int ret = 0;
SNIC_BUG_ON(!rqi);
SNIC_BUG_ON(!rqi->tm_tag);
/* fill in lun info */
int_to_scsilun(sc->device->lun, &lun);
/* Initialize snic_host_req: itmf */
snic_itmf_init(tmreq,
tm_tag,
snic->config.hid,
(ulong) rqi,
0 /* flags */,
req_id, /* Command to be aborted. */
rqi->tgt_id,
lun.scsi_lun,
tmf);
/*
* In case of multiple aborts on same cmd,
* use try_wait_for_completion and completion_done() to check
* whether it queues aborts even after completion of abort issued
* prior.SNIC_BUG_ON(completion_done(&rqi->done));
*/
ret = snic_queue_wq_desc(snic, tmreq, sizeof(*tmreq));
if (ret)
SNIC_HOST_ERR(snic->shost,
"qitmf:Queuing ITMF(%d) Req sc %p, rqi %p, req_id %d tag %d Failed, ret = %d\n",
tmf, sc, rqi, req_id, snic_cmd_tag(sc), ret);
else
SNIC_SCSI_DBG(snic->shost,
"qitmf:Queuing ITMF(%d) Req sc %p, rqi %p, req_id %d, tag %d (req_id)- Success.",
tmf, sc, rqi, req_id, snic_cmd_tag(sc));
return ret;
} /* end of snic_queue_itmf_req */
static int
snic_issue_tm_req(struct snic *snic,
struct snic_req_info *rqi,
struct scsi_cmnd *sc,
int tmf)
{
struct snic_host_req *tmreq = NULL;
int req_id = 0, tag = snic_cmd_tag(sc);
int ret = 0;
if (snic_get_state(snic) == SNIC_FWRESET)
return -EBUSY;
atomic_inc(&snic->ios_inflight);
SNIC_SCSI_DBG(snic->shost,
"issu_tmreq: Task mgmt req %d. rqi %p w/ tag %x\n",
tmf, rqi, tag);
if (tmf == SNIC_ITMF_LUN_RESET) {
tmreq = snic_dr_req_init(snic, rqi);
req_id = SCSI_NO_TAG;
} else {
tmreq = snic_abort_req_init(snic, rqi);
req_id = tag;
}
if (!tmreq) {
ret = -ENOMEM;
goto tmreq_err;
}
ret = snic_queue_itmf_req(snic, tmreq, sc, tmf, req_id);
if (ret)
goto tmreq_err;
ret = 0;
tmreq_err:
if (ret) {
SNIC_HOST_ERR(snic->shost,
"issu_tmreq: Queing ITMF(%d) Req, sc %p rqi %p req_id %d tag %x fails err = %d\n",
tmf, sc, rqi, req_id, tag, ret);
} else {
SNIC_SCSI_DBG(snic->shost,
"issu_tmreq: Queuing ITMF(%d) Req, sc %p, rqi %p, req_id %d tag %x - Success.\n",
tmf, sc, rqi, req_id, tag);
}
atomic_dec(&snic->ios_inflight);
return ret;
}
/*
* snic_queue_abort_req : Queues abort req to WQ
*/
static int
snic_queue_abort_req(struct snic *snic,
struct snic_req_info *rqi,
struct scsi_cmnd *sc,
int tmf)
{
SNIC_SCSI_DBG(snic->shost, "q_abtreq: sc %p, rqi %p, tag %x, tmf %d\n",
sc, rqi, snic_cmd_tag(sc), tmf);
/* Add special tag for abort */
rqi->tm_tag |= SNIC_TAG_ABORT;
return snic_issue_tm_req(snic, rqi, sc, tmf);
}
/*
* snic_abort_finish : called by snic_abort_cmd on queuing abort successfully.
*/
static int
snic_abort_finish(struct snic *snic, struct scsi_cmnd *sc)
{
struct snic_req_info *rqi = NULL;
spinlock_t *io_lock = NULL;
unsigned long flags;
int ret = 0, tag = snic_cmd_tag(sc);
io_lock = snic_io_lock_hash(snic, sc);
spin_lock_irqsave(io_lock, flags);
rqi = (struct snic_req_info *) CMD_SP(sc);
if (!rqi) {
atomic64_inc(&snic->s_stats.io.req_null);
CMD_FLAGS(sc) |= SNIC_IO_ABTS_TERM_REQ_NULL;
SNIC_SCSI_DBG(snic->shost,
"abt_fini:req info is null tag 0x%x, sc 0x%p flags 0x%llx\n",
tag, sc, CMD_FLAGS(sc));
ret = FAILED;
goto abort_fail;
}
rqi->abts_done = NULL;
ret = FAILED;
/* Check the abort status. */
switch (CMD_ABTS_STATUS(sc)) {
case SNIC_INVALID_CODE:
/* Firmware didn't complete abort req, timedout */
CMD_FLAGS(sc) |= SNIC_IO_ABTS_TIMEDOUT;
atomic64_inc(&snic->s_stats.abts.drv_tmo);
SNIC_SCSI_DBG(snic->shost,
"abt_fini:sc %p Tag %x Driver Timeout.flags 0x%llx\n",
sc, snic_cmd_tag(sc), CMD_FLAGS(sc));
/* do not release snic request in timedout case */
rqi = NULL;
goto abort_fail;
case SNIC_STAT_IO_SUCCESS:
case SNIC_STAT_IO_NOT_FOUND:
ret = SUCCESS;
/*
* If abort path doesn't call scsi_done(),
* the # IO timeouts == 2, will cause the LUN offline.
* Call scsi_done to complete the IO.
*/
sc->result = (DID_ERROR << 16);
sc->scsi_done(sc);
break;
default:
/* Firmware completed abort with error */
ret = FAILED;
rqi = NULL;
break;
}
CMD_SP(sc) = NULL;
SNIC_HOST_INFO(snic->shost,
"abt_fini: Tag %x, Cmpl Status %s flags 0x%llx\n",
tag, snic_io_status_to_str(CMD_ABTS_STATUS(sc)),
CMD_FLAGS(sc));
abort_fail:
spin_unlock_irqrestore(io_lock, flags);
if (rqi)
snic_release_req_buf(snic, rqi, sc);
return ret;
} /* end of snic_abort_finish */
/*
* snic_send_abort_and_wait : Issues Abort, and Waits
*/
static int
snic_send_abort_and_wait(struct snic *snic, struct scsi_cmnd *sc)
{
struct snic_req_info *rqi = NULL;
enum snic_ioreq_state sv_state;
struct snic_tgt *tgt = NULL;
spinlock_t *io_lock = NULL;
DECLARE_COMPLETION_ONSTACK(tm_done);
unsigned long flags;
int ret = 0, tmf = 0, tag = snic_cmd_tag(sc);
tgt = starget_to_tgt(scsi_target(sc->device));
if ((snic_tgt_chkready(tgt) != 0) && (tgt->tdata.typ == SNIC_TGT_SAN))
tmf = SNIC_ITMF_ABTS_TASK_TERM;
else
tmf = SNIC_ITMF_ABTS_TASK;
/* stats */
io_lock = snic_io_lock_hash(snic, sc);
/*
* Avoid a race between SCSI issuing the abort and the device
* completing the command.
*
* If the command is already completed by fw_cmpl code,
* we just return SUCCESS from here. This means that the abort
* succeeded. In the SCSI ML, since the timeout for command has
* happend, the completion wont actually complete the command
* and it will be considered as an aborted command
*
* The CMD_SP will not be cleared except while holding io_lock
*/
spin_lock_irqsave(io_lock, flags);
rqi = (struct snic_req_info *) CMD_SP(sc);
if (!rqi) {
spin_unlock_irqrestore(io_lock, flags);
SNIC_HOST_ERR(snic->shost,
"abt_cmd: rqi is null. Tag %d flags 0x%llx\n",
tag, CMD_FLAGS(sc));
ret = SUCCESS;
goto send_abts_end;
}
rqi->abts_done = &tm_done;
if (CMD_STATE(sc) == SNIC_IOREQ_ABTS_PENDING) {
spin_unlock_irqrestore(io_lock, flags);
ret = 0;
goto abts_pending;
}
SNIC_BUG_ON(!rqi->abts_done);
/* Save Command State, should be restored on failed to Queue. */
sv_state = CMD_STATE(sc);
/*
* Command is still pending, need to abort it
* If the fw completes the command after this point,
* the completion won't be done till mid-layer, since abot
* has already started.
*/
CMD_STATE(sc) = SNIC_IOREQ_ABTS_PENDING;
CMD_ABTS_STATUS(sc) = SNIC_INVALID_CODE;
SNIC_SCSI_DBG(snic->shost, "send_abt_cmd: TAG 0x%x\n", tag);
spin_unlock_irqrestore(io_lock, flags);
/* Now Queue the abort command to firmware */
ret = snic_queue_abort_req(snic, rqi, sc, tmf);
if (ret) {
atomic64_inc(&snic->s_stats.abts.q_fail);
SNIC_HOST_ERR(snic->shost,
"send_abt_cmd: IO w/ Tag 0x%x fail w/ err %d flags 0x%llx\n",
tag, ret, CMD_FLAGS(sc));
spin_lock_irqsave(io_lock, flags);
/* Restore Command's previous state */
CMD_STATE(sc) = sv_state;
rqi = (struct snic_req_info *) CMD_SP(sc);
if (rqi)
rqi->abts_done = NULL;
spin_unlock_irqrestore(io_lock, flags);
ret = FAILED;
goto send_abts_end;
}
spin_lock_irqsave(io_lock, flags);
if (tmf == SNIC_ITMF_ABTS_TASK) {
CMD_FLAGS(sc) |= SNIC_IO_ABTS_ISSUED;
atomic64_inc(&snic->s_stats.abts.num);
} else {
/* term stats */
CMD_FLAGS(sc) |= SNIC_IO_TERM_ISSUED;
}
spin_unlock_irqrestore(io_lock, flags);
SNIC_SCSI_DBG(snic->shost,
"send_abt_cmd: sc %p Tag %x flags 0x%llx\n",
sc, tag, CMD_FLAGS(sc));
ret = 0;
abts_pending:
/*
* Queued an abort IO, wait for its completion.
* Once the fw completes the abort command, it will
* wakeup this thread.
*/
wait_for_completion_timeout(&tm_done, SNIC_ABTS_TIMEOUT);
send_abts_end:
return ret;
} /* end of snic_send_abort_and_wait */
/*
* This function is exported to SCSI for sending abort cmnds.
* A SCSI IO is represent by snic_ioreq in the driver.
* The snic_ioreq is linked to the SCSI Cmd, thus a link with the ULP'S IO
*/
int
snic_abort_cmd(struct scsi_cmnd *sc)
{
struct snic *snic = shost_priv(sc->device->host);
int ret = SUCCESS, tag = snic_cmd_tag(sc);
u32 start_time = jiffies;
SNIC_SCSI_DBG(snic->shost, "abt_cmd:sc %p :0x%x :req = %p :tag = %d\n",
sc, sc->cmnd[0], sc->request, tag);
if (unlikely(snic_get_state(snic) != SNIC_ONLINE)) {
SNIC_HOST_ERR(snic->shost,
"abt_cmd: tag %x Parent Devs are not rdy\n",
tag);
ret = FAST_IO_FAIL;
goto abort_end;
}
ret = snic_send_abort_and_wait(snic, sc);
if (ret)
goto abort_end;
ret = snic_abort_finish(snic, sc);
abort_end:
SNIC_TRC(snic->shost->host_no, tag, (ulong) sc,
jiffies_to_msecs(jiffies - start_time), 0,
SNIC_TRC_CMD(sc), SNIC_TRC_CMD_STATE_FLAGS(sc));
SNIC_SCSI_DBG(snic->shost,
"abts: Abort Req Status = %s\n",
(ret == SUCCESS) ? "SUCCESS" :
((ret == FAST_IO_FAIL) ? "FAST_IO_FAIL" : "FAILED"));
return ret;
}
static int
snic_is_abts_pending(struct snic *snic, struct scsi_cmnd *lr_sc)
{
struct snic_req_info *rqi = NULL;
struct scsi_cmnd *sc = NULL;
struct scsi_device *lr_sdev = NULL;
spinlock_t *io_lock = NULL;
u32 tag;
unsigned long flags;
if (lr_sc)
lr_sdev = lr_sc->device;
/* walk through the tag map, an dcheck if IOs are still pending in fw*/
for (tag = 0; tag < snic->max_tag_id; tag++) {
io_lock = snic_io_lock_tag(snic, tag);
spin_lock_irqsave(io_lock, flags);
sc = scsi_host_find_tag(snic->shost, tag);
if (!sc || (lr_sc && (sc->device != lr_sdev || sc == lr_sc))) {
spin_unlock_irqrestore(io_lock, flags);
continue;
}
rqi = (struct snic_req_info *) CMD_SP(sc);
if (!rqi) {
spin_unlock_irqrestore(io_lock, flags);
continue;
}
/*
* Found IO that is still pending w/ firmware and belongs to
* the LUN that is under reset, if lr_sc != NULL
*/
SNIC_SCSI_DBG(snic->shost, "Found IO in %s on LUN\n",
snic_ioreq_state_to_str(CMD_STATE(sc)));
if (CMD_STATE(sc) == SNIC_IOREQ_ABTS_PENDING) {
spin_unlock_irqrestore(io_lock, flags);
return 1;
}
spin_unlock_irqrestore(io_lock, flags);
}
return 0;
} /* end of snic_is_abts_pending */
static int
snic_dr_clean_single_req(struct snic *snic,
u32 tag,
struct scsi_device *lr_sdev)
{
struct snic_req_info *rqi = NULL;
struct snic_tgt *tgt = NULL;
struct scsi_cmnd *sc = NULL;
spinlock_t *io_lock = NULL;
u32 sv_state = 0, tmf = 0;
DECLARE_COMPLETION_ONSTACK(tm_done);
unsigned long flags;
int ret = 0;
io_lock = snic_io_lock_tag(snic, tag);
spin_lock_irqsave(io_lock, flags);
sc = scsi_host_find_tag(snic->shost, tag);
/* Ignore Cmd that don't belong to Lun Reset device */
if (!sc || sc->device != lr_sdev)
goto skip_clean;
rqi = (struct snic_req_info *) CMD_SP(sc);
if (!rqi)
goto skip_clean;
if (CMD_STATE(sc) == SNIC_IOREQ_ABTS_PENDING)
goto skip_clean;
if ((CMD_FLAGS(sc) & SNIC_DEVICE_RESET) &&
(!(CMD_FLAGS(sc) & SNIC_DEV_RST_ISSUED))) {
SNIC_SCSI_DBG(snic->shost,
"clean_single_req: devrst is not pending sc 0x%p\n",
sc);
goto skip_clean;
}
SNIC_SCSI_DBG(snic->shost,
"clean_single_req: Found IO in %s on lun\n",
snic_ioreq_state_to_str(CMD_STATE(sc)));
/* Save Command State */
sv_state = CMD_STATE(sc);
/*
* Any pending IO issued prior to reset is expected to be
* in abts pending state, if not we need to set SNIC_IOREQ_ABTS_PENDING
* to indicate the IO is abort pending.
* When IO is completed, the IO will be handed over and handled
* in this function.
*/
CMD_STATE(sc) = SNIC_IOREQ_ABTS_PENDING;
SNIC_BUG_ON(rqi->abts_done);
if (CMD_FLAGS(sc) & SNIC_DEVICE_RESET) {
rqi->tm_tag = SNIC_TAG_DEV_RST;
SNIC_SCSI_DBG(snic->shost,
"clean_single_req:devrst sc 0x%p\n", sc);
}
CMD_ABTS_STATUS(sc) = SNIC_INVALID_CODE;
rqi->abts_done = &tm_done;
spin_unlock_irqrestore(io_lock, flags);
tgt = starget_to_tgt(scsi_target(sc->device));
if ((snic_tgt_chkready(tgt) != 0) && (tgt->tdata.typ == SNIC_TGT_SAN))
tmf = SNIC_ITMF_ABTS_TASK_TERM;
else
tmf = SNIC_ITMF_ABTS_TASK;
/* Now queue the abort command to firmware */
ret = snic_queue_abort_req(snic, rqi, sc, tmf);
if (ret) {
SNIC_HOST_ERR(snic->shost,
"clean_single_req_err:sc %p, tag %d abt failed. tm_tag %d flags 0x%llx\n",
sc, tag, rqi->tm_tag, CMD_FLAGS(sc));
spin_lock_irqsave(io_lock, flags);
rqi = (struct snic_req_info *) CMD_SP(sc);
if (rqi)
rqi->abts_done = NULL;
/* Restore Command State */
if (CMD_STATE(sc) == SNIC_IOREQ_ABTS_PENDING)
CMD_STATE(sc) = sv_state;
ret = 1;
goto skip_clean;
}
spin_lock_irqsave(io_lock, flags);
if (CMD_FLAGS(sc) & SNIC_DEVICE_RESET)
CMD_FLAGS(sc) |= SNIC_DEV_RST_TERM_ISSUED;
CMD_FLAGS(sc) |= SNIC_IO_INTERNAL_TERM_ISSUED;
spin_unlock_irqrestore(io_lock, flags);
wait_for_completion_timeout(&tm_done, SNIC_ABTS_TIMEOUT);
/* Recheck cmd state to check if it now aborted. */
spin_lock_irqsave(io_lock, flags);
rqi = (struct snic_req_info *) CMD_SP(sc);
if (!rqi) {
CMD_FLAGS(sc) |= SNIC_IO_ABTS_TERM_REQ_NULL;
goto skip_clean;
}
rqi->abts_done = NULL;
/* if abort is still pending w/ fw, fail */
if (CMD_ABTS_STATUS(sc) == SNIC_INVALID_CODE) {
SNIC_HOST_ERR(snic->shost,
"clean_single_req_err:sc %p tag %d abt still pending w/ fw, tm_tag %d flags 0x%llx\n",
sc, tag, rqi->tm_tag, CMD_FLAGS(sc));
CMD_FLAGS(sc) |= SNIC_IO_ABTS_TERM_DONE;
ret = 1;
goto skip_clean;
}
CMD_STATE(sc) = SNIC_IOREQ_ABTS_COMPLETE;
CMD_SP(sc) = NULL;
spin_unlock_irqrestore(io_lock, flags);
snic_release_req_buf(snic, rqi, sc);
sc->result = (DID_ERROR << 16);
sc->scsi_done(sc);
ret = 0;
return ret;
skip_clean:
spin_unlock_irqrestore(io_lock, flags);
return ret;
} /* end of snic_dr_clean_single_req */
static int
snic_dr_clean_pending_req(struct snic *snic, struct scsi_cmnd *lr_sc)
{
struct scsi_device *lr_sdev = lr_sc->device;
u32 tag = 0;
int ret = FAILED;
for (tag = 0; tag < snic->max_tag_id; tag++) {
if (tag == snic_cmd_tag(lr_sc))
continue;
ret = snic_dr_clean_single_req(snic, tag, lr_sdev);
if (ret) {
SNIC_HOST_ERR(snic->shost, "clean_err:tag = %d\n", tag);
goto clean_err;
}
}
schedule_timeout(msecs_to_jiffies(100));
/* Walk through all the cmds and check abts status. */
if (snic_is_abts_pending(snic, lr_sc)) {
ret = FAILED;
goto clean_err;
}
ret = 0;
SNIC_SCSI_DBG(snic->shost, "clean_pending_req: Success.\n");
return ret;
clean_err:
ret = FAILED;
SNIC_HOST_ERR(snic->shost,
"Failed to Clean Pending IOs on %s device.\n",
dev_name(&lr_sdev->sdev_gendev));
return ret;
} /* end of snic_dr_clean_pending_req */
/*
* snic_dr_finish : Called by snic_device_reset
*/
static int
snic_dr_finish(struct snic *snic, struct scsi_cmnd *sc)
{
struct snic_req_info *rqi = NULL;
spinlock_t *io_lock = NULL;
unsigned long flags;
int lr_res = 0;
int ret = FAILED;
io_lock = snic_io_lock_hash(snic, sc);
spin_lock_irqsave(io_lock, flags);
rqi = (struct snic_req_info *) CMD_SP(sc);
if (!rqi) {
spin_unlock_irqrestore(io_lock, flags);
SNIC_SCSI_DBG(snic->shost,
"dr_fini: rqi is null tag 0x%x sc 0x%p flags 0x%llx\n",
snic_cmd_tag(sc), sc, CMD_FLAGS(sc));
ret = FAILED;
goto dr_fini_end;
}
rqi->dr_done = NULL;
lr_res = CMD_LR_STATUS(sc);
switch (lr_res) {
case SNIC_INVALID_CODE:
/* stats */
SNIC_SCSI_DBG(snic->shost,
"dr_fini: Tag %x Dev Reset Timedout. flags 0x%llx\n",
snic_cmd_tag(sc), CMD_FLAGS(sc));
CMD_FLAGS(sc) |= SNIC_DEV_RST_TIMEDOUT;
ret = FAILED;
goto dr_failed;
case SNIC_STAT_IO_SUCCESS:
SNIC_SCSI_DBG(snic->shost,
"dr_fini: Tag %x Dev Reset cmpl\n",
snic_cmd_tag(sc));
ret = 0;
break;
default:
SNIC_HOST_ERR(snic->shost,
"dr_fini:Device Reset completed& failed.Tag = %x lr_status %s flags 0x%llx\n",
snic_cmd_tag(sc),
snic_io_status_to_str(lr_res), CMD_FLAGS(sc));
ret = FAILED;
goto dr_failed;
}
spin_unlock_irqrestore(io_lock, flags);
/*
* Cleanup any IOs on this LUN that have still not completed.
* If any of these fail, then LUN Reset fails.
* Cleanup cleans all commands on this LUN except
* the lun reset command. If all cmds get cleaned, the LUN Reset
* succeeds.
*/
ret = snic_dr_clean_pending_req(snic, sc);
if (ret) {
spin_lock_irqsave(io_lock, flags);
SNIC_SCSI_DBG(snic->shost,
"dr_fini: Device Reset Failed since could not abort all IOs. Tag = %x.\n",
snic_cmd_tag(sc));
rqi = (struct snic_req_info *) CMD_SP(sc);
goto dr_failed;
} else {
/* Cleanup LUN Reset Command */
spin_lock_irqsave(io_lock, flags);
rqi = (struct snic_req_info *) CMD_SP(sc);
if (rqi)
ret = SUCCESS; /* Completed Successfully */
else
ret = FAILED;
}
dr_failed:
SNIC_BUG_ON(!spin_is_locked(io_lock));
if (rqi)
CMD_SP(sc) = NULL;
spin_unlock_irqrestore(io_lock, flags);
if (rqi)
snic_release_req_buf(snic, rqi, sc);
dr_fini_end:
return ret;
} /* end of snic_dr_finish */
static int
snic_queue_dr_req(struct snic *snic,
struct snic_req_info *rqi,
struct scsi_cmnd *sc)
{
/* Add special tag for device reset */
rqi->tm_tag |= SNIC_TAG_DEV_RST;
return snic_issue_tm_req(snic, rqi, sc, SNIC_ITMF_LUN_RESET);
}
static int
snic_send_dr_and_wait(struct snic *snic, struct scsi_cmnd *sc)
{
struct snic_req_info *rqi = NULL;
enum snic_ioreq_state sv_state;
spinlock_t *io_lock = NULL;
unsigned long flags;
DECLARE_COMPLETION_ONSTACK(tm_done);
int ret = FAILED, tag = snic_cmd_tag(sc);
io_lock = snic_io_lock_hash(snic, sc);
spin_lock_irqsave(io_lock, flags);
CMD_FLAGS(sc) |= SNIC_DEVICE_RESET;
rqi = (struct snic_req_info *) CMD_SP(sc);
if (!rqi) {
SNIC_HOST_ERR(snic->shost,
"send_dr: rqi is null, Tag 0x%x flags 0x%llx\n",
tag, CMD_FLAGS(sc));
spin_unlock_irqrestore(io_lock, flags);
ret = FAILED;
goto send_dr_end;
}
/* Save Command state to restore in case Queuing failed. */
sv_state = CMD_STATE(sc);
CMD_STATE(sc) = SNIC_IOREQ_LR_PENDING;
CMD_LR_STATUS(sc) = SNIC_INVALID_CODE;
SNIC_SCSI_DBG(snic->shost, "dr: TAG = %x\n", tag);
rqi->dr_done = &tm_done;
SNIC_BUG_ON(!rqi->dr_done);
spin_unlock_irqrestore(io_lock, flags);
/*
* The Command state is changed to IOREQ_PENDING,
* in this case, if the command is completed, the icmnd_cmpl will
* mark the cmd as completed.
* This logic still makes LUN Reset is inevitable.
*/
ret = snic_queue_dr_req(snic, rqi, sc);
if (ret) {
SNIC_HOST_ERR(snic->shost,
"send_dr: IO w/ Tag 0x%x Failed err = %d. flags 0x%llx\n",
tag, ret, CMD_FLAGS(sc));
spin_lock_irqsave(io_lock, flags);
/* Restore State */
CMD_STATE(sc) = sv_state;
rqi = (struct snic_req_info *) CMD_SP(sc);
if (rqi)
rqi->dr_done = NULL;
/* rqi is freed in caller. */
spin_unlock_irqrestore(io_lock, flags);
ret = FAILED;
goto send_dr_end;
}
spin_lock_irqsave(io_lock, flags);
CMD_FLAGS(sc) |= SNIC_DEV_RST_ISSUED;
spin_unlock_irqrestore(io_lock, flags);
ret = 0;
wait_for_completion_timeout(&tm_done, SNIC_LUN_RESET_TIMEOUT);
send_dr_end:
return ret;
}
/*
* auxillary funciton to check lun reset op is supported or not
* Not supported if returns 0
*/
static int
snic_dev_reset_supported(struct scsi_device *sdev)
{
struct snic_tgt *tgt = starget_to_tgt(scsi_target(sdev));
if (tgt->tdata.typ == SNIC_TGT_DAS)
return 0;
return 1;
}
static void
snic_unlink_and_release_req(struct snic *snic, struct scsi_cmnd *sc, int flag)
{
struct snic_req_info *rqi = NULL;
spinlock_t *io_lock = NULL;
unsigned long flags;
u32 start_time = jiffies;
io_lock = snic_io_lock_hash(snic, sc);
spin_lock_irqsave(io_lock, flags);
rqi = (struct snic_req_info *) CMD_SP(sc);
if (rqi) {
start_time = rqi->start_time;
CMD_SP(sc) = NULL;
}
CMD_FLAGS(sc) |= flag;
spin_unlock_irqrestore(io_lock, flags);
if (rqi)
snic_release_req_buf(snic, rqi, sc);
SNIC_TRC(snic->shost->host_no, snic_cmd_tag(sc), (ulong) sc,
jiffies_to_msecs(jiffies - start_time), (ulong) rqi,
SNIC_TRC_CMD(sc), SNIC_TRC_CMD_STATE_FLAGS(sc));
}
/*
* SCSI Eh thread issues a LUN Reset when one or more commands on a LUN
* fail to get aborted. It calls driver's eh_device_reset with a SCSI
* command on the LUN.
*/
int
snic_device_reset(struct scsi_cmnd *sc)
{
struct Scsi_Host *shost = sc->device->host;
struct snic *snic = shost_priv(shost);
struct snic_req_info *rqi = NULL;
int tag = snic_cmd_tag(sc);
int start_time = jiffies;
int ret = FAILED;
int dr_supp = 0;
SNIC_SCSI_DBG(shost, "dev_reset:sc %p :0x%x :req = %p :tag = %d\n",
sc, sc->cmnd[0], sc->request,
snic_cmd_tag(sc));
dr_supp = snic_dev_reset_supported(sc->device);
if (!dr_supp) {
/* device reset op is not supported */
SNIC_HOST_INFO(shost, "LUN Reset Op not supported.\n");
snic_unlink_and_release_req(snic, sc, SNIC_DEV_RST_NOTSUP);
goto dev_rst_end;
}
if (unlikely(snic_get_state(snic) != SNIC_ONLINE)) {
snic_unlink_and_release_req(snic, sc, 0);
SNIC_HOST_ERR(shost, "Devrst: Parent Devs are not online.\n");
goto dev_rst_end;
}
/* There is no tag when lun reset is issue through ioctl. */
if (unlikely(tag <= SNIC_NO_TAG)) {
SNIC_HOST_INFO(snic->shost,
"Devrst: LUN Reset Recvd thru IOCTL.\n");
rqi = snic_req_init(snic, 0);
if (!rqi)
goto dev_rst_end;
memset(scsi_cmd_priv(sc), 0,
sizeof(struct snic_internal_io_state));
CMD_SP(sc) = (char *)rqi;
CMD_FLAGS(sc) = SNIC_NO_FLAGS;
/* Add special tag for dr coming from user spc */
rqi->tm_tag = SNIC_TAG_IOCTL_DEV_RST;
rqi->sc = sc;
}
ret = snic_send_dr_and_wait(snic, sc);
if (ret) {
SNIC_HOST_ERR(snic->shost,
"Devrst: IO w/ Tag %x Failed w/ err = %d\n",
tag, ret);
snic_unlink_and_release_req(snic, sc, 0);
goto dev_rst_end;
}
ret = snic_dr_finish(snic, sc);
dev_rst_end:
SNIC_TRC(snic->shost->host_no, tag, (ulong) sc,
jiffies_to_msecs(jiffies - start_time),
0, SNIC_TRC_CMD(sc), SNIC_TRC_CMD_STATE_FLAGS(sc));
SNIC_SCSI_DBG(snic->shost,
"Devrst: Returning from Device Reset : %s\n",
(ret == SUCCESS) ? "SUCCESS" : "FAILED");
return ret;
} /* end of snic_device_reset */
/*
* SCSI Error handling calls driver's eh_host_reset if all prior
* error handling levels return FAILED.
*
* Host Reset is the highest level of error recovery. If this fails, then
* host is offlined by SCSI.
*/
/*
* snic_issue_hba_reset : Queues FW Reset Request.
*/
static int
snic_issue_hba_reset(struct snic *snic, struct scsi_cmnd *sc)
{
struct snic_req_info *rqi = NULL;
struct snic_host_req *req = NULL;
spinlock_t *io_lock = NULL;
DECLARE_COMPLETION_ONSTACK(wait);
unsigned long flags;
int ret = -ENOMEM;
rqi = snic_req_init(snic, 0);
if (!rqi) {
ret = -ENOMEM;
goto hba_rst_end;
}
if (snic_cmd_tag(sc) == SCSI_NO_TAG) {
memset(scsi_cmd_priv(sc), 0,
sizeof(struct snic_internal_io_state));
SNIC_HOST_INFO(snic->shost, "issu_hr:Host reset thru ioctl.\n");
rqi->sc = sc;
}
req = rqi_to_req(rqi);
io_lock = snic_io_lock_hash(snic, sc);
spin_lock_irqsave(io_lock, flags);
SNIC_BUG_ON(CMD_SP(sc) != NULL);
CMD_STATE(sc) = SNIC_IOREQ_PENDING;
CMD_SP(sc) = (char *) rqi;
CMD_FLAGS(sc) |= SNIC_IO_INITIALIZED;
snic->remove_wait = &wait;
spin_unlock_irqrestore(io_lock, flags);
/* Initialize Request */
snic_io_hdr_enc(&req->hdr, SNIC_REQ_HBA_RESET, 0, snic_cmd_tag(sc),
snic->config.hid, 0, (ulong) rqi);
req->u.reset.flags = 0;
ret = snic_queue_wq_desc(snic, req, sizeof(*req));
if (ret) {
SNIC_HOST_ERR(snic->shost,
"issu_hr:Queuing HBA Reset Failed. w err %d\n",
ret);
goto hba_rst_err;
}
spin_lock_irqsave(io_lock, flags);
CMD_FLAGS(sc) |= SNIC_HOST_RESET_ISSUED;
spin_unlock_irqrestore(io_lock, flags);
atomic64_inc(&snic->s_stats.reset.hba_resets);
SNIC_HOST_INFO(snic->shost, "Queued HBA Reset Successfully.\n");
wait_for_completion_timeout(snic->remove_wait,
SNIC_HOST_RESET_TIMEOUT);
if (snic_get_state(snic) == SNIC_FWRESET) {
SNIC_HOST_ERR(snic->shost, "reset_cmpl: Reset Timedout.\n");
ret = -ETIMEDOUT;
goto hba_rst_err;
}
spin_lock_irqsave(io_lock, flags);
snic->remove_wait = NULL;
rqi = (struct snic_req_info *) CMD_SP(sc);
CMD_SP(sc) = NULL;
spin_unlock_irqrestore(io_lock, flags);
if (rqi)
snic_req_free(snic, rqi);
ret = 0;
return ret;
hba_rst_err:
spin_lock_irqsave(io_lock, flags);
snic->remove_wait = NULL;
rqi = (struct snic_req_info *) CMD_SP(sc);
CMD_SP(sc) = NULL;
spin_unlock_irqrestore(io_lock, flags);
if (rqi)
snic_req_free(snic, rqi);
hba_rst_end:
SNIC_HOST_ERR(snic->shost,
"reset:HBA Reset Failed w/ err = %d.\n",
ret);
return ret;
} /* end of snic_issue_hba_reset */
int
snic_reset(struct Scsi_Host *shost, struct scsi_cmnd *sc)
{
struct snic *snic = shost_priv(shost);
enum snic_state sv_state;
unsigned long flags;
int ret = FAILED;
/* Set snic state as SNIC_FWRESET*/
sv_state = snic_get_state(snic);
spin_lock_irqsave(&snic->snic_lock, flags);
if (snic_get_state(snic) == SNIC_FWRESET) {
spin_unlock_irqrestore(&snic->snic_lock, flags);
SNIC_HOST_INFO(shost, "reset:prev reset is in progres\n");
msleep(SNIC_HOST_RESET_TIMEOUT);
ret = SUCCESS;
goto reset_end;
}
snic_set_state(snic, SNIC_FWRESET);
spin_unlock_irqrestore(&snic->snic_lock, flags);
/* Wait for all the IOs that are entered in Qcmd */
while (atomic_read(&snic->ios_inflight))
schedule_timeout(msecs_to_jiffies(1));
ret = snic_issue_hba_reset(snic, sc);
if (ret) {
SNIC_HOST_ERR(shost,
"reset:Host Reset Failed w/ err %d.\n",
ret);
spin_lock_irqsave(&snic->snic_lock, flags);
snic_set_state(snic, sv_state);
spin_unlock_irqrestore(&snic->snic_lock, flags);
atomic64_inc(&snic->s_stats.reset.hba_reset_fail);
ret = FAILED;
goto reset_end;
}
ret = SUCCESS;
reset_end:
return ret;
} /* end of snic_reset */
/*
* SCSI Error handling calls driver's eh_host_reset if all prior
* error handling levels return FAILED.
*
* Host Reset is the highest level of error recovery. If this fails, then
* host is offlined by SCSI.
*/
int
snic_host_reset(struct scsi_cmnd *sc)
{
struct Scsi_Host *shost = sc->device->host;
u32 start_time = jiffies;
int ret = FAILED;
SNIC_SCSI_DBG(shost,
"host reset:sc %p sc_cmd 0x%x req %p tag %d flags 0x%llx\n",
sc, sc->cmnd[0], sc->request,
snic_cmd_tag(sc), CMD_FLAGS(sc));
ret = snic_reset(shost, sc);
SNIC_TRC(shost->host_no, snic_cmd_tag(sc), (ulong) sc,
jiffies_to_msecs(jiffies - start_time),
0, SNIC_TRC_CMD(sc), SNIC_TRC_CMD_STATE_FLAGS(sc));
return ret;
} /* end of snic_host_reset */
/*
* snic_cmpl_pending_tmreq : Caller should hold io_lock
*/
static void
snic_cmpl_pending_tmreq(struct snic *snic, struct scsi_cmnd *sc)
{
struct snic_req_info *rqi = NULL;
SNIC_SCSI_DBG(snic->shost,
"Completing Pending TM Req sc %p, state %s flags 0x%llx\n",
sc, snic_io_status_to_str(CMD_STATE(sc)), CMD_FLAGS(sc));
/*
* CASE : FW didn't post itmf completion due to PCIe Errors.
* Marking the abort status as Success to call scsi completion
* in snic_abort_finish()
*/
CMD_ABTS_STATUS(sc) = SNIC_STAT_IO_SUCCESS;
rqi = (struct snic_req_info *) CMD_SP(sc);
if (!rqi)
return;
if (rqi->dr_done)
complete(rqi->dr_done);
else if (rqi->abts_done)
complete(rqi->abts_done);
}
/*
* snic_scsi_cleanup: Walks through tag map and releases the reqs
*/
static void
snic_scsi_cleanup(struct snic *snic, int ex_tag)
{
struct snic_req_info *rqi = NULL;
struct scsi_cmnd *sc = NULL;
spinlock_t *io_lock = NULL;
unsigned long flags;
int tag;
u64 st_time = 0;
SNIC_SCSI_DBG(snic->shost, "sc_clean: scsi cleanup.\n");
for (tag = 0; tag < snic->max_tag_id; tag++) {
/* Skip ex_tag */
if (tag == ex_tag)
continue;
io_lock = snic_io_lock_tag(snic, tag);
spin_lock_irqsave(io_lock, flags);
sc = scsi_host_find_tag(snic->shost, tag);
if (!sc) {
spin_unlock_irqrestore(io_lock, flags);
continue;
}
if (unlikely(snic_tmreq_pending(sc))) {
/*
* When FW Completes reset w/o sending completions
* for outstanding ios.
*/
snic_cmpl_pending_tmreq(snic, sc);
spin_unlock_irqrestore(io_lock, flags);
continue;
}
rqi = (struct snic_req_info *) CMD_SP(sc);
if (!rqi) {
spin_unlock_irqrestore(io_lock, flags);
goto cleanup;
}
SNIC_SCSI_DBG(snic->shost,
"sc_clean: sc %p, rqi %p, tag %d flags 0x%llx\n",
sc, rqi, tag, CMD_FLAGS(sc));
CMD_SP(sc) = NULL;
CMD_FLAGS(sc) |= SNIC_SCSI_CLEANUP;
spin_unlock_irqrestore(io_lock, flags);
st_time = rqi->start_time;
SNIC_HOST_INFO(snic->shost,
"sc_clean: Releasing rqi %p : flags 0x%llx\n",
rqi, CMD_FLAGS(sc));
snic_release_req_buf(snic, rqi, sc);
cleanup:
sc->result = DID_TRANSPORT_DISRUPTED << 16;
SNIC_HOST_INFO(snic->shost,
"sc_clean: DID_TRANSPORT_DISRUPTED for sc %p, Tag %d flags 0x%llx rqi %p duration %u msecs\n",
sc, sc->request->tag, CMD_FLAGS(sc), rqi,
jiffies_to_msecs(jiffies - st_time));
/* Update IO stats */
snic_stats_update_io_cmpl(&snic->s_stats);
if (sc->scsi_done) {
SNIC_TRC(snic->shost->host_no, tag, (ulong) sc,
jiffies_to_msecs(jiffies - st_time), 0,
SNIC_TRC_CMD(sc),
SNIC_TRC_CMD_STATE_FLAGS(sc));
sc->scsi_done(sc);
}
}
} /* end of snic_scsi_cleanup */
void
snic_shutdown_scsi_cleanup(struct snic *snic)
{
SNIC_HOST_INFO(snic->shost, "Shutdown time SCSI Cleanup.\n");
snic_scsi_cleanup(snic, SCSI_NO_TAG);
} /* end of snic_shutdown_scsi_cleanup */
/*
* snic_internal_abort_io
* called by : snic_tgt_scsi_abort_io
*/
static int
snic_internal_abort_io(struct snic *snic, struct scsi_cmnd *sc, int tmf)
{
struct snic_req_info *rqi = NULL;
spinlock_t *io_lock = NULL;
unsigned long flags;
u32 sv_state = 0;
int ret = 0;
io_lock = snic_io_lock_hash(snic, sc);
spin_lock_irqsave(io_lock, flags);
rqi = (struct snic_req_info *) CMD_SP(sc);
if (!rqi)
goto skip_internal_abts;
if (CMD_STATE(sc) == SNIC_IOREQ_ABTS_PENDING)
goto skip_internal_abts;
if ((CMD_FLAGS(sc) & SNIC_DEVICE_RESET) &&
(!(CMD_FLAGS(sc) & SNIC_DEV_RST_ISSUED))) {
SNIC_SCSI_DBG(snic->shost,
"internal_abts: dev rst not pending sc 0x%p\n",
sc);
goto skip_internal_abts;
}
if (!(CMD_FLAGS(sc) & SNIC_IO_ISSUED)) {
SNIC_SCSI_DBG(snic->shost,
"internal_abts: IO not yet issued sc 0x%p tag 0x%x flags 0x%llx state %d\n",
sc, snic_cmd_tag(sc), CMD_FLAGS(sc), CMD_STATE(sc));
goto skip_internal_abts;
}
sv_state = CMD_STATE(sc);
CMD_STATE(sc) = SNIC_IOREQ_ABTS_PENDING;
CMD_ABTS_STATUS(sc) = SNIC_INVALID_CODE;
CMD_FLAGS(sc) |= SNIC_IO_INTERNAL_TERM_PENDING;
if (CMD_FLAGS(sc) & SNIC_DEVICE_RESET) {
/* stats */
rqi->tm_tag = SNIC_TAG_DEV_RST;
SNIC_SCSI_DBG(snic->shost, "internal_abts:dev rst sc %p\n", sc);
}
SNIC_SCSI_DBG(snic->shost, "internal_abts: Issuing abts tag %x\n",
snic_cmd_tag(sc));
SNIC_BUG_ON(rqi->abts_done);
spin_unlock_irqrestore(io_lock, flags);
ret = snic_queue_abort_req(snic, rqi, sc, tmf);
if (ret) {
SNIC_HOST_ERR(snic->shost,
"internal_abts: Tag = %x , Failed w/ err = %d\n",
snic_cmd_tag(sc), ret);
spin_lock_irqsave(io_lock, flags);
if (CMD_STATE(sc) == SNIC_IOREQ_ABTS_PENDING)
CMD_STATE(sc) = sv_state;
goto skip_internal_abts;
}
spin_lock_irqsave(io_lock, flags);
if (CMD_FLAGS(sc) & SNIC_DEVICE_RESET)
CMD_FLAGS(sc) |= SNIC_DEV_RST_TERM_ISSUED;
else
CMD_FLAGS(sc) |= SNIC_IO_INTERNAL_TERM_ISSUED;
ret = SUCCESS;
skip_internal_abts:
SNIC_BUG_ON(!spin_is_locked(io_lock));
spin_unlock_irqrestore(io_lock, flags);
return ret;
} /* end of snic_internal_abort_io */
/*
* snic_tgt_scsi_abort_io : called by snic_tgt_del
*/
int
snic_tgt_scsi_abort_io(struct snic_tgt *tgt)
{
struct snic *snic = NULL;
struct scsi_cmnd *sc = NULL;
struct snic_tgt *sc_tgt = NULL;
spinlock_t *io_lock = NULL;
unsigned long flags;
int ret = 0, tag, abt_cnt = 0, tmf = 0;
if (!tgt)
return -1;
snic = shost_priv(snic_tgt_to_shost(tgt));
SNIC_SCSI_DBG(snic->shost, "tgt_abt_io: Cleaning Pending IOs.\n");
if (tgt->tdata.typ == SNIC_TGT_DAS)
tmf = SNIC_ITMF_ABTS_TASK;
else
tmf = SNIC_ITMF_ABTS_TASK_TERM;
for (tag = 0; tag < snic->max_tag_id; tag++) {
io_lock = snic_io_lock_tag(snic, tag);
spin_lock_irqsave(io_lock, flags);
sc = scsi_host_find_tag(snic->shost, tag);
if (!sc) {
spin_unlock_irqrestore(io_lock, flags);
continue;
}
sc_tgt = starget_to_tgt(scsi_target(sc->device));
if (sc_tgt != tgt) {
spin_unlock_irqrestore(io_lock, flags);
continue;
}
spin_unlock_irqrestore(io_lock, flags);
ret = snic_internal_abort_io(snic, sc, tmf);
if (ret < 0) {
SNIC_HOST_ERR(snic->shost,
"tgt_abt_io: Tag %x, Failed w err = %d\n",
tag, ret);
continue;
}
if (ret == SUCCESS)
abt_cnt++;
}
SNIC_SCSI_DBG(snic->shost, "tgt_abt_io: abt_cnt = %d\n", abt_cnt);
return 0;
} /* end of snic_tgt_scsi_abort_io */
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