Hi Narsimhulu,
please find comments inline.
On 02/10/2015 05:43 PM, Narsimhulu Musini wrote:
> snic_scsi.c contains scsi handling, includes queuing io, abort, lun reset,
> and host reset. Also it handles asynchronous event notifications from FW.
>
> Signed-off-by: Narsimhulu Musini <nmusini@xxxxxxxxx>
> Signed-off-by: Sesidhar Baddela <sebaddel@xxxxxxxxx>
> ---
> drivers/scsi/snic/snic_scsi.c | 2630 +++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 2630 insertions(+)
> create mode 100644 drivers/scsi/snic/snic_scsi.c
>
> diff --git a/drivers/scsi/snic/snic_scsi.c b/drivers/scsi/snic/snic_scsi.c
> new file mode 100644
> index 0000000..863a92b
> --- /dev/null
> +++ b/drivers/scsi/snic/snic_scsi.c
> @@ -0,0 +1,2630 @@
> +/*
> + * 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"
> +#include "snic_os.h"
> +
> +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%x\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));
> +
> + pci_unmap_single(snic->pdev,
> + 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;
> + int 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 Mapping Failed for sc %p tag %x\n",
> + sc, snic_cmd_tag(sc));
> + ret = -EINVAL;
> +
> + 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 */
> + (u64)rqi,
> + flags, /* command flags */
> + rqi->tgt_id,
> + lun.scsi_lun,
> + sc->cmnd,
> + sc->cmd_len,
> + scsi_bufflen(sc),
> + sg_cnt,
> + (u64)req_to_sgl(rqi->req),
> + pa, /* sense buffer pa */
> + SCSI_SENSE_BUFFERSIZE);
> +
> + ret = snic_queue_wq_desc(snic, rqi->req, rqi->req_len);
> + if (ret) {
> + SNIC_SCSI_DBG(snic->shost,
> + "QIcmnd: Queuing Icmnd Failed. ret = %d\n",
> + ret);
> +
> + ret = SNIC_IO_QERR;
Please use consistent return codes.
Either you use the standard error codes or define your own.
But please to not mix them.
> + }
> +
> + 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 = SCSI_MLQUEUE_HOST_BUSY;
> + 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, (u64)sc, 0,
> + sc->cmnd[0], sg_cnt, CMD_STATE(sc));
> +
> + SNIC_SCSI_DBG(snic->shost, "issue_sc:Negative SG Count.\n");
> + goto issue_sc_end;
> + }
> +
Shouldn't the command be aborted here?
'MLQUEUE_HOST_BUSY' means to retry later, but I doubt the sg count
will have been changed then ...
> + rqi = snic_req_init(snic, sg_cnt);
> + if (!rqi) {
> + scsi_dma_unmap(sc);
> +
> + 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) {
> + ret = SCSI_MLQUEUE_HOST_BUSY;
Please do not overload return codes with different ranges.
'snic_queue_icmnd_req' returns a variety of error codes, but _not_
within the range what queuecommand expects.
So please use a different variable here or omit it altogether,
seeing that the _value_ of the return is never used.
> + SNIC_TRC(snic->shost->host_no, tag, (u64)sc, 0, 0, 0,
> + SNIC_TRC_CMD_STATE_FLAGS(sc));
> +
> + 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);
> + } 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);
> + }
> +
> +issue_sc_end:
> + SNIC_TRC(snic->shost->host_no, tag, (u64)sc, (u64)rqi, sg_cnt, cmd_trc,
> + cmd_st_flags);
> +
> + 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
> + */
> +static int
> +snic_queuecommand_lck(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
Do you absolutely need to run under the host lock?
I would have expected that any new driver is able to run without the
host-lock held; otherwise performance will be impacted.
> +{
> + struct Scsi_Host *shost = sc->device->host;
> + 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;
> + 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);
> +
> + sc->scsi_done = done;
> +
> + spin_unlock_irq(shost->host_lock);
> +
> + 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);
> +
> +#ifdef SNIC_DEBUG
> + scsi_print_command(sc);
> +#endif
> +
> + ret = snic_issue_scsi_req(snic, tgt, sc);
> + if (ret)
> + SNIC_HOST_ERR(shost, "Failed to Q, Scsi Request.\n");
> + else
> + snic_stats_update_active_ios(&snic->s_stats);
> +
> + atomic_dec(&snic->ios_inflight);
> +
> + spin_lock_irq(shost->host_lock);
> +
> + return ret;
> +} /* end of snic_queuecommand */
> +
> +DEF_SCSI_QCMD(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 = SNIC_IO_CMPL_ABTSTATUS;
Error code overloading again.
Please use 'DID_XXX' codes only here.
> + 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, 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);
> + res = DID_ERROR;
> + 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_DEV_OFFLINE: /* Device offline */
> + case SNIC_STAT_NOT_READY: /* XPT yet to initialize */
> + 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%x\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, icmnd_cmpl->resid);
> +
> + if (icmnd_cmpl->flags & SNIC_ICMND_CMPL_UNDR_RUN) {
> + xfer_len -= 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%x\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;
> + u64 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 = %llx\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),
> + fwreq, icmnd_cmpl->resid, ctx);
> +
> + return;
> + }
> +
> +
> +#ifdef SNIC_DEBUG
> + scsi_print_result(sc);
> +#endif
> +
> + 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 %xrqi %p\n",
> + sc->device->lun, sc, sc->cmnd[0], snic_cmd_tag(sc),
> + CMD_FLAGS(sc), rqi);
> +
> + 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%x\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%x\n",
> + snic_ioreq_state_to_str(CMD_STATE(sc)),
> + snic_io_status_to_str(hdr_stat),
> + sc, sc_stat, icmnd_cmpl->resid, CMD_FLAGS(sc));
> +
> + SNIC_TRC(snic->shost->host_no, cmnd_id, sc,
> + jiffies_to_msecs(jiffies - start_time), fwreq,
> + SNIC_TRC_CMD(sc), SNIC_TRC_CMD_STATE_FLAGS(sc));
> +
> + return;
> + }
> +
> + if (snic_process_icmnd_cmpl_status(snic, icmnd_cmpl, hdr_stat, sc)) {
> +#ifdef SNIC_DEBUG
> + scsi_print_command(sc);
> +#endif
> + SNIC_HOST_ERR(snic->shost,
> + "icmnd_cmpl:IO Failed, sc 0x%p Tag %d Cmd %x Hdr Status %s flags 0x%x\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, (u64)sc,
> + jiffies_to_msecs(jiffies - start_time), (u64)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, sc,
> + jiffies_to_msecs(jiffies - start_time),
> + 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%x\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, sc,
> + jiffies_to_msecs(jiffies - start_time),
> + 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%x\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%x\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);
> + 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%x\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;
> + }
> +
Why don't you modify CMD_STATE() here?
> + 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%x\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 = (SNIC_ABTS_CMPL_ERR << 16);
> + SNIC_SCSI_DBG(snic->shost,
> + "itmf_cmpl: Completing IO. sc %p flags 0x%x\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, sc,
> + jiffies_to_msecs(jiffies - start_time),
> + fwreq,
> + SNIC_TRC_CMD(sc),
> + SNIC_TRC_CMD_STATE_FLAGS(sc));
> +
> + sc->scsi_done(sc);
> + }
Hmm? Can it be possible to have a scsi command _without_ the ->done
callback?
> +
> + 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%x\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%x\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;
> + u64 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 = %llx\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",
> + 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)
> +{
> + u64 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_HOST_INFO(snic->shost,
> + "reset_cmpl:HBA Reset Completion received.\n");
> +
> + snic_io_hdr_dec(&fwreq->hdr, &typ, &hdr_stat, &cmnd_id, &hid, &ctx);
> + SNIC_SCSI_DBG(snic->shost,
> + "reset_cmpl: type = %x, hdr_stat = %x, cmnd_id = %x, hid = %x, ctx = %llx\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;
> + 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;
> + }
> +
You need a tag for sending out a host reset?
So what do you do if the tag space becomes exhausted and you need to
reset the HBA?
> + 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 %x\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;
> + u64 ctx;
> + struct snic_async_evnotify *aen = &fwreq->u.async_ev;
> +
> + 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 = %llx\n",
> + typ, hdr_stat, cmnd_id, hid, ctx);
> +
> + switch (aen->ev_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 = vnic_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,
> + (u64) 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);
> + ret = SNIC_IO_QERR;
> + } 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%x\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 %x\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;
> + break;
> +
> + default:
> + /* Firmware completed abort with error */
> + ret = FAILED;
> + break;
> + }
> +
> + CMD_STATE(sc) = SNIC_IOREQ_ABTS_COMPLETE;
> + CMD_SP(sc) = NULL;
> + SNIC_HOST_INFO(snic->shost,
> + "abt_fini: Tag %x, Cmpl Status %s flags 0x%x\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%x\n",
> + tag, CMD_FLAGS(sc));
> +
> + ret = FAILED;
> +
That doesn't match the comment; you said in the command you'd return
'SUCCESS', yet you do return FAILED ...
> + 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) {
> + SNIC_HOST_ERR(snic->shost,
> + "send_abt_cmd: IO w/ Tag 0x%x fail w/ err %d flags 0x%x\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 %x\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 = FAILED;
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, 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" : "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%x\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 %dflags %x\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);
> +
> + 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%x\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 %x\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%x\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%x\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%x\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), sc,
> + jiffies_to_msecs(jiffies - start_time),
> + 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;
> +
> + 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, 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) {
> + 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, (u64)rqi);
> +
> + req->u.reset.flags = 0;
> +
> + ret = snic_queue_wq_desc(snic, req, sizeof(*req));
> + if (ret) {
> + SNIC_HOST_INFO(snic->shost, "Queuing HBA Reset Failed.\n");
> + ret = SNIC_IO_QERR;
> +
> + 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, "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);
> +
> + 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%x\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), 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%x\n",
> + sc, snic_io_status_to_str(CMD_STATE(sc)), CMD_FLAGS(sc));
> +
> + 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 %x\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%x\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. rqi %p duration %llu msecs\n",
> + sc, rqi, (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, 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 %x 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 == SNIC_IO_QERR) {
> + 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 */
>
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@xxxxxxx +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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