diff options
Diffstat (limited to 'drivers/scsi/snic/snic_scsi.c')
| -rw-r--r-- | drivers/scsi/snic/snic_scsi.c | 2648 |
1 files changed, 2648 insertions, 0 deletions
diff --git a/drivers/scsi/snic/snic_scsi.c b/drivers/scsi/snic/snic_scsi.c new file mode 100644 index 000000000..961af6fc2 --- /dev/null +++ b/drivers/scsi/snic/snic_scsi.c @@ -0,0 +1,2648 @@ +// SPDX-License-Identifier: GPL-2.0-only +// Copyright 2014 Cisco Systems, Inc. All rights reserved. + +#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) (scsi_cmd_to_rq(sc)->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_COMPLETE", + [SNIC_IOREQ_LR_PENDING] = "SNIC_IOREQ_LR_PENDING", + [SNIC_IOREQ_LR_COMPLETE] = "SNIC_IOREQ_LR_COMPLETE", + [SNIC_IOREQ_COMPLETE] = "SNIC_IOREQ_CMD_COMPLETE", +}; + +/* 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) + dma_unmap_single(&snic->pdev->dev, + le64_to_cpu(req->u.icmnd.sense_addr), + SCSI_SENSE_BUFFERSIZE, + DMA_FROM_DEVICE); + + 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 = dma_map_single(&snic->pdev->dev, + sc->sense_buffer, + SCSI_SENSE_BUFFERSIZE, + DMA_FROM_DEVICE); + if (dma_mapping_error(&snic->pdev->dev, 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; + 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); + + 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)); + + + 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); + + 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)); + + 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 timeout\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 Firmware 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); + +tmreq_err: + if (ret) { + SNIC_HOST_ERR(snic->shost, + "issu_tmreq: Queueing 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: Queueing 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); + 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], scsi_cmd_to_rq(sc), 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); + 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: + lockdep_assert_held(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], scsi_cmd_to_rq(sc), + 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 progress\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; + + SNIC_SCSI_DBG(shost, + "host reset:sc %p sc_cmd 0x%x req %p tag %d flags 0x%llx\n", + sc, sc->cmnd[0], scsi_cmd_to_rq(sc), + 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, scsi_cmd_to_rq(sc)->tag, CMD_FLAGS(sc), rqi, + jiffies_to_msecs(jiffies - st_time)); + + /* Update IO stats */ + snic_stats_update_io_cmpl(&snic->s_stats); + + 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)); + + 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: + lockdep_assert_held(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 */ |