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lpfc_scsi.c
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lpfc_scsi.c
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/*******************************************************************
* This file is part of the Emulex Linux Device Driver for *
* Fibre Channel Host Bus Adapters. *
* Copyright (C) 2017-2022 Broadcom. All Rights Reserved. The term *
* “Broadcom” refers to Broadcom Inc. and/or its subsidiaries. *
* Copyright (C) 2004-2016 Emulex. All rights reserved. *
* EMULEX and SLI are trademarks of Emulex. *
* www.broadcom.com *
* Portions Copyright (C) 2004-2005 Christoph Hellwig *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of version 2 of the GNU General *
* Public License as published by the Free Software Foundation. *
* This program is distributed in the hope that it will be useful. *
* ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND *
* WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, *
* FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE *
* DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
* TO BE LEGALLY INVALID. See the GNU General Public License for *
* more details, a copy of which can be found in the file COPYING *
* included with this package. *
*******************************************************************/
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/export.h>
#include <linux/delay.h>
#include <asm/unaligned.h>
#include <linux/t10-pi.h>
#include <linux/crc-t10dif.h>
#include <linux/blk-cgroup.h>
#include <net/checksum.h>
#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_transport_fc.h>
#include "lpfc_version.h"
#include "lpfc_hw4.h"
#include "lpfc_hw.h"
#include "lpfc_sli.h"
#include "lpfc_sli4.h"
#include "lpfc_nl.h"
#include "lpfc_disc.h"
#include "lpfc.h"
#include "lpfc_scsi.h"
#include "lpfc_logmsg.h"
#include "lpfc_crtn.h"
#include "lpfc_vport.h"
#define LPFC_RESET_WAIT 2
#define LPFC_ABORT_WAIT 2
static char *dif_op_str[] = {
"PROT_NORMAL",
"PROT_READ_INSERT",
"PROT_WRITE_STRIP",
"PROT_READ_STRIP",
"PROT_WRITE_INSERT",
"PROT_READ_PASS",
"PROT_WRITE_PASS",
};
struct scsi_dif_tuple {
__be16 guard_tag; /* Checksum */
__be16 app_tag; /* Opaque storage */
__be32 ref_tag; /* Target LBA or indirect LBA */
};
static struct lpfc_rport_data *
lpfc_rport_data_from_scsi_device(struct scsi_device *sdev)
{
struct lpfc_vport *vport = (struct lpfc_vport *)sdev->host->hostdata;
if (vport->phba->cfg_fof)
return ((struct lpfc_device_data *)sdev->hostdata)->rport_data;
else
return (struct lpfc_rport_data *)sdev->hostdata;
}
static void
lpfc_release_scsi_buf_s4(struct lpfc_hba *phba, struct lpfc_io_buf *psb);
static void
lpfc_release_scsi_buf_s3(struct lpfc_hba *phba, struct lpfc_io_buf *psb);
static int
lpfc_prot_group_type(struct lpfc_hba *phba, struct scsi_cmnd *sc);
/**
* lpfc_sli4_set_rsp_sgl_last - Set the last bit in the response sge.
* @phba: Pointer to HBA object.
* @lpfc_cmd: lpfc scsi command object pointer.
*
* This function is called from the lpfc_prep_task_mgmt_cmd function to
* set the last bit in the response sge entry.
**/
static void
lpfc_sli4_set_rsp_sgl_last(struct lpfc_hba *phba,
struct lpfc_io_buf *lpfc_cmd)
{
struct sli4_sge *sgl = (struct sli4_sge *)lpfc_cmd->dma_sgl;
if (sgl) {
sgl += 1;
sgl->word2 = le32_to_cpu(sgl->word2);
bf_set(lpfc_sli4_sge_last, sgl, 1);
sgl->word2 = cpu_to_le32(sgl->word2);
}
}
#define LPFC_INVALID_REFTAG ((u32)-1)
/**
* lpfc_update_stats - Update statistical data for the command completion
* @vport: The virtual port on which this call is executing.
* @lpfc_cmd: lpfc scsi command object pointer.
*
* This function is called when there is a command completion and this
* function updates the statistical data for the command completion.
**/
static void
lpfc_update_stats(struct lpfc_vport *vport, struct lpfc_io_buf *lpfc_cmd)
{
struct lpfc_hba *phba = vport->phba;
struct lpfc_rport_data *rdata;
struct lpfc_nodelist *pnode;
struct scsi_cmnd *cmd = lpfc_cmd->pCmd;
unsigned long flags;
struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
unsigned long latency;
int i;
if (!vport->stat_data_enabled ||
vport->stat_data_blocked ||
(cmd->result))
return;
latency = jiffies_to_msecs((long)jiffies - (long)lpfc_cmd->start_time);
rdata = lpfc_cmd->rdata;
pnode = rdata->pnode;
spin_lock_irqsave(shost->host_lock, flags);
if (!pnode ||
!pnode->lat_data ||
(phba->bucket_type == LPFC_NO_BUCKET)) {
spin_unlock_irqrestore(shost->host_lock, flags);
return;
}
if (phba->bucket_type == LPFC_LINEAR_BUCKET) {
i = (latency + phba->bucket_step - 1 - phba->bucket_base)/
phba->bucket_step;
/* check array subscript bounds */
if (i < 0)
i = 0;
else if (i >= LPFC_MAX_BUCKET_COUNT)
i = LPFC_MAX_BUCKET_COUNT - 1;
} else {
for (i = 0; i < LPFC_MAX_BUCKET_COUNT-1; i++)
if (latency <= (phba->bucket_base +
((1<<i)*phba->bucket_step)))
break;
}
pnode->lat_data[i].cmd_count++;
spin_unlock_irqrestore(shost->host_lock, flags);
}
/**
* lpfc_rampdown_queue_depth - Post RAMP_DOWN_QUEUE event to worker thread
* @phba: The Hba for which this call is being executed.
*
* This routine is called when there is resource error in driver or firmware.
* This routine posts WORKER_RAMP_DOWN_QUEUE event for @phba. This routine
* posts at most 1 event each second. This routine wakes up worker thread of
* @phba to process WORKER_RAM_DOWN_EVENT event.
*
* This routine should be called with no lock held.
**/
void
lpfc_rampdown_queue_depth(struct lpfc_hba *phba)
{
unsigned long flags;
uint32_t evt_posted;
unsigned long expires;
spin_lock_irqsave(&phba->hbalock, flags);
atomic_inc(&phba->num_rsrc_err);
phba->last_rsrc_error_time = jiffies;
expires = phba->last_ramp_down_time + QUEUE_RAMP_DOWN_INTERVAL;
if (time_after(expires, jiffies)) {
spin_unlock_irqrestore(&phba->hbalock, flags);
return;
}
phba->last_ramp_down_time = jiffies;
spin_unlock_irqrestore(&phba->hbalock, flags);
spin_lock_irqsave(&phba->pport->work_port_lock, flags);
evt_posted = phba->pport->work_port_events & WORKER_RAMP_DOWN_QUEUE;
if (!evt_posted)
phba->pport->work_port_events |= WORKER_RAMP_DOWN_QUEUE;
spin_unlock_irqrestore(&phba->pport->work_port_lock, flags);
if (!evt_posted)
lpfc_worker_wake_up(phba);
return;
}
/**
* lpfc_ramp_down_queue_handler - WORKER_RAMP_DOWN_QUEUE event handler
* @phba: The Hba for which this call is being executed.
*
* This routine is called to process WORKER_RAMP_DOWN_QUEUE event for worker
* thread.This routine reduces queue depth for all scsi device on each vport
* associated with @phba.
**/
void
lpfc_ramp_down_queue_handler(struct lpfc_hba *phba)
{
struct lpfc_vport **vports;
struct Scsi_Host *shost;
struct scsi_device *sdev;
unsigned long new_queue_depth;
unsigned long num_rsrc_err, num_cmd_success;
int i;
num_rsrc_err = atomic_read(&phba->num_rsrc_err);
num_cmd_success = atomic_read(&phba->num_cmd_success);
/*
* The error and success command counters are global per
* driver instance. If another handler has already
* operated on this error event, just exit.
*/
if (num_rsrc_err == 0)
return;
vports = lpfc_create_vport_work_array(phba);
if (vports != NULL)
for (i = 0; i <= phba->max_vports && vports[i] != NULL; i++) {
shost = lpfc_shost_from_vport(vports[i]);
shost_for_each_device(sdev, shost) {
new_queue_depth =
sdev->queue_depth * num_rsrc_err /
(num_rsrc_err + num_cmd_success);
if (!new_queue_depth)
new_queue_depth = sdev->queue_depth - 1;
else
new_queue_depth = sdev->queue_depth -
new_queue_depth;
scsi_change_queue_depth(sdev, new_queue_depth);
}
}
lpfc_destroy_vport_work_array(phba, vports);
atomic_set(&phba->num_rsrc_err, 0);
atomic_set(&phba->num_cmd_success, 0);
}
/**
* lpfc_scsi_dev_block - set all scsi hosts to block state
* @phba: Pointer to HBA context object.
*
* This function walks vport list and set each SCSI host to block state
* by invoking fc_remote_port_delete() routine. This function is invoked
* with EEH when device's PCI slot has been permanently disabled.
**/
void
lpfc_scsi_dev_block(struct lpfc_hba *phba)
{
struct lpfc_vport **vports;
struct Scsi_Host *shost;
struct scsi_device *sdev;
struct fc_rport *rport;
int i;
vports = lpfc_create_vport_work_array(phba);
if (vports != NULL)
for (i = 0; i <= phba->max_vports && vports[i] != NULL; i++) {
shost = lpfc_shost_from_vport(vports[i]);
shost_for_each_device(sdev, shost) {
rport = starget_to_rport(scsi_target(sdev));
fc_remote_port_delete(rport);
}
}
lpfc_destroy_vport_work_array(phba, vports);
}
/**
* lpfc_new_scsi_buf_s3 - Scsi buffer allocator for HBA with SLI3 IF spec
* @vport: The virtual port for which this call being executed.
* @num_to_alloc: The requested number of buffers to allocate.
*
* This routine allocates a scsi buffer for device with SLI-3 interface spec,
* the scsi buffer contains all the necessary information needed to initiate
* a SCSI I/O. The non-DMAable buffer region contains information to build
* the IOCB. The DMAable region contains memory for the FCP CMND, FCP RSP,
* and the initial BPL. In addition to allocating memory, the FCP CMND and
* FCP RSP BDEs are setup in the BPL and the BPL BDE is setup in the IOCB.
*
* Return codes:
* int - number of scsi buffers that were allocated.
* 0 = failure, less than num_to_alloc is a partial failure.
**/
static int
lpfc_new_scsi_buf_s3(struct lpfc_vport *vport, int num_to_alloc)
{
struct lpfc_hba *phba = vport->phba;
struct lpfc_io_buf *psb;
struct ulp_bde64 *bpl;
IOCB_t *iocb;
dma_addr_t pdma_phys_fcp_cmd;
dma_addr_t pdma_phys_fcp_rsp;
dma_addr_t pdma_phys_sgl;
uint16_t iotag;
int bcnt, bpl_size;
bpl_size = phba->cfg_sg_dma_buf_size -
(sizeof(struct fcp_cmnd) + sizeof(struct fcp_rsp));
lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
"9067 ALLOC %d scsi_bufs: %d (%d + %d + %d)\n",
num_to_alloc, phba->cfg_sg_dma_buf_size,
(int)sizeof(struct fcp_cmnd),
(int)sizeof(struct fcp_rsp), bpl_size);
for (bcnt = 0; bcnt < num_to_alloc; bcnt++) {
psb = kzalloc(sizeof(struct lpfc_io_buf), GFP_KERNEL);
if (!psb)
break;
/*
* Get memory from the pci pool to map the virt space to pci
* bus space for an I/O. The DMA buffer includes space for the
* struct fcp_cmnd, struct fcp_rsp and the number of bde's
* necessary to support the sg_tablesize.
*/
psb->data = dma_pool_zalloc(phba->lpfc_sg_dma_buf_pool,
GFP_KERNEL, &psb->dma_handle);
if (!psb->data) {
kfree(psb);
break;
}
/* Allocate iotag for psb->cur_iocbq. */
iotag = lpfc_sli_next_iotag(phba, &psb->cur_iocbq);
if (iotag == 0) {
dma_pool_free(phba->lpfc_sg_dma_buf_pool,
psb->data, psb->dma_handle);
kfree(psb);
break;
}
psb->cur_iocbq.cmd_flag |= LPFC_IO_FCP;
psb->fcp_cmnd = psb->data;
psb->fcp_rsp = psb->data + sizeof(struct fcp_cmnd);
psb->dma_sgl = psb->data + sizeof(struct fcp_cmnd) +
sizeof(struct fcp_rsp);
/* Initialize local short-hand pointers. */
bpl = (struct ulp_bde64 *)psb->dma_sgl;
pdma_phys_fcp_cmd = psb->dma_handle;
pdma_phys_fcp_rsp = psb->dma_handle + sizeof(struct fcp_cmnd);
pdma_phys_sgl = psb->dma_handle + sizeof(struct fcp_cmnd) +
sizeof(struct fcp_rsp);
/*
* The first two bdes are the FCP_CMD and FCP_RSP. The balance
* are sg list bdes. Initialize the first two and leave the
* rest for queuecommand.
*/
bpl[0].addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys_fcp_cmd));
bpl[0].addrLow = le32_to_cpu(putPaddrLow(pdma_phys_fcp_cmd));
bpl[0].tus.f.bdeSize = sizeof(struct fcp_cmnd);
bpl[0].tus.f.bdeFlags = BUFF_TYPE_BDE_64;
bpl[0].tus.w = le32_to_cpu(bpl[0].tus.w);
/* Setup the physical region for the FCP RSP */
bpl[1].addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys_fcp_rsp));
bpl[1].addrLow = le32_to_cpu(putPaddrLow(pdma_phys_fcp_rsp));
bpl[1].tus.f.bdeSize = sizeof(struct fcp_rsp);
bpl[1].tus.f.bdeFlags = BUFF_TYPE_BDE_64;
bpl[1].tus.w = le32_to_cpu(bpl[1].tus.w);
/*
* Since the IOCB for the FCP I/O is built into this
* lpfc_scsi_buf, initialize it with all known data now.
*/
iocb = &psb->cur_iocbq.iocb;
iocb->un.fcpi64.bdl.ulpIoTag32 = 0;
if ((phba->sli_rev == 3) &&
!(phba->sli3_options & LPFC_SLI3_BG_ENABLED)) {
/* fill in immediate fcp command BDE */
iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BDE_IMMED;
iocb->un.fcpi64.bdl.bdeSize = sizeof(struct fcp_cmnd);
iocb->un.fcpi64.bdl.addrLow = offsetof(IOCB_t,
unsli3.fcp_ext.icd);
iocb->un.fcpi64.bdl.addrHigh = 0;
iocb->ulpBdeCount = 0;
iocb->ulpLe = 0;
/* fill in response BDE */
iocb->unsli3.fcp_ext.rbde.tus.f.bdeFlags =
BUFF_TYPE_BDE_64;
iocb->unsli3.fcp_ext.rbde.tus.f.bdeSize =
sizeof(struct fcp_rsp);
iocb->unsli3.fcp_ext.rbde.addrLow =
putPaddrLow(pdma_phys_fcp_rsp);
iocb->unsli3.fcp_ext.rbde.addrHigh =
putPaddrHigh(pdma_phys_fcp_rsp);
} else {
iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BLP_64;
iocb->un.fcpi64.bdl.bdeSize =
(2 * sizeof(struct ulp_bde64));
iocb->un.fcpi64.bdl.addrLow =
putPaddrLow(pdma_phys_sgl);
iocb->un.fcpi64.bdl.addrHigh =
putPaddrHigh(pdma_phys_sgl);
iocb->ulpBdeCount = 1;
iocb->ulpLe = 1;
}
iocb->ulpClass = CLASS3;
psb->status = IOSTAT_SUCCESS;
/* Put it back into the SCSI buffer list */
psb->cur_iocbq.io_buf = psb;
spin_lock_init(&psb->buf_lock);
lpfc_release_scsi_buf_s3(phba, psb);
}
return bcnt;
}
/**
* lpfc_sli4_vport_delete_fcp_xri_aborted -Remove all ndlp references for vport
* @vport: pointer to lpfc vport data structure.
*
* This routine is invoked by the vport cleanup for deletions and the cleanup
* for an ndlp on removal.
**/
void
lpfc_sli4_vport_delete_fcp_xri_aborted(struct lpfc_vport *vport)
{
struct lpfc_hba *phba = vport->phba;
struct lpfc_io_buf *psb, *next_psb;
struct lpfc_sli4_hdw_queue *qp;
unsigned long iflag = 0;
int idx;
if (!(vport->cfg_enable_fc4_type & LPFC_ENABLE_FCP))
return;
spin_lock_irqsave(&phba->hbalock, iflag);
for (idx = 0; idx < phba->cfg_hdw_queue; idx++) {
qp = &phba->sli4_hba.hdwq[idx];
spin_lock(&qp->abts_io_buf_list_lock);
list_for_each_entry_safe(psb, next_psb,
&qp->lpfc_abts_io_buf_list, list) {
if (psb->cur_iocbq.cmd_flag & LPFC_IO_NVME)
continue;
if (psb->rdata && psb->rdata->pnode &&
psb->rdata->pnode->vport == vport)
psb->rdata = NULL;
}
spin_unlock(&qp->abts_io_buf_list_lock);
}
spin_unlock_irqrestore(&phba->hbalock, iflag);
}
/**
* lpfc_sli4_io_xri_aborted - Fast-path process of fcp xri abort
* @phba: pointer to lpfc hba data structure.
* @axri: pointer to the fcp xri abort wcqe structure.
* @idx: index into hdwq
*
* This routine is invoked by the worker thread to process a SLI4 fast-path
* FCP or NVME aborted xri.
**/
void
lpfc_sli4_io_xri_aborted(struct lpfc_hba *phba,
struct sli4_wcqe_xri_aborted *axri, int idx)
{
u16 xri = 0;
u16 rxid = 0;
struct lpfc_io_buf *psb, *next_psb;
struct lpfc_sli4_hdw_queue *qp;
unsigned long iflag = 0;
struct lpfc_iocbq *iocbq;
int i;
struct lpfc_nodelist *ndlp;
int rrq_empty = 0;
struct lpfc_sli_ring *pring = phba->sli4_hba.els_wq->pring;
struct scsi_cmnd *cmd;
int offline = 0;
if (!(phba->cfg_enable_fc4_type & LPFC_ENABLE_FCP))
return;
offline = pci_channel_offline(phba->pcidev);
if (!offline) {
xri = bf_get(lpfc_wcqe_xa_xri, axri);
rxid = bf_get(lpfc_wcqe_xa_remote_xid, axri);
}
qp = &phba->sli4_hba.hdwq[idx];
spin_lock_irqsave(&phba->hbalock, iflag);
spin_lock(&qp->abts_io_buf_list_lock);
list_for_each_entry_safe(psb, next_psb,
&qp->lpfc_abts_io_buf_list, list) {
if (offline)
xri = psb->cur_iocbq.sli4_xritag;
if (psb->cur_iocbq.sli4_xritag == xri) {
list_del_init(&psb->list);
psb->flags &= ~LPFC_SBUF_XBUSY;
psb->status = IOSTAT_SUCCESS;
if (psb->cur_iocbq.cmd_flag & LPFC_IO_NVME) {
qp->abts_nvme_io_bufs--;
spin_unlock(&qp->abts_io_buf_list_lock);
spin_unlock_irqrestore(&phba->hbalock, iflag);
if (!offline) {
lpfc_sli4_nvme_xri_aborted(phba, axri,
psb);
return;
}
lpfc_sli4_nvme_pci_offline_aborted(phba, psb);
spin_lock_irqsave(&phba->hbalock, iflag);
spin_lock(&qp->abts_io_buf_list_lock);
continue;
}
qp->abts_scsi_io_bufs--;
spin_unlock(&qp->abts_io_buf_list_lock);
if (psb->rdata && psb->rdata->pnode)
ndlp = psb->rdata->pnode;
else
ndlp = NULL;
rrq_empty = list_empty(&phba->active_rrq_list);
spin_unlock_irqrestore(&phba->hbalock, iflag);
if (ndlp && !offline) {
lpfc_set_rrq_active(phba, ndlp,
psb->cur_iocbq.sli4_lxritag, rxid, 1);
lpfc_sli4_abts_err_handler(phba, ndlp, axri);
}
if (phba->cfg_fcp_wait_abts_rsp || offline) {
spin_lock_irqsave(&psb->buf_lock, iflag);
cmd = psb->pCmd;
psb->pCmd = NULL;
spin_unlock_irqrestore(&psb->buf_lock, iflag);
/* The sdev is not guaranteed to be valid post
* scsi_done upcall.
*/
if (cmd)
scsi_done(cmd);
/*
* We expect there is an abort thread waiting
* for command completion wake up the thread.
*/
spin_lock_irqsave(&psb->buf_lock, iflag);
psb->cur_iocbq.cmd_flag &=
~LPFC_DRIVER_ABORTED;
if (psb->waitq)
wake_up(psb->waitq);
spin_unlock_irqrestore(&psb->buf_lock, iflag);
}
lpfc_release_scsi_buf_s4(phba, psb);
if (rrq_empty)
lpfc_worker_wake_up(phba);
if (!offline)
return;
spin_lock_irqsave(&phba->hbalock, iflag);
spin_lock(&qp->abts_io_buf_list_lock);
continue;
}
}
spin_unlock(&qp->abts_io_buf_list_lock);
if (!offline) {
for (i = 1; i <= phba->sli.last_iotag; i++) {
iocbq = phba->sli.iocbq_lookup[i];
if (!(iocbq->cmd_flag & LPFC_IO_FCP) ||
(iocbq->cmd_flag & LPFC_IO_LIBDFC))
continue;
if (iocbq->sli4_xritag != xri)
continue;
psb = container_of(iocbq, struct lpfc_io_buf, cur_iocbq);
psb->flags &= ~LPFC_SBUF_XBUSY;
spin_unlock_irqrestore(&phba->hbalock, iflag);
if (!list_empty(&pring->txq))
lpfc_worker_wake_up(phba);
return;
}
}
spin_unlock_irqrestore(&phba->hbalock, iflag);
}
/**
* lpfc_get_scsi_buf_s3 - Get a scsi buffer from lpfc_scsi_buf_list of the HBA
* @phba: The HBA for which this call is being executed.
* @ndlp: pointer to a node-list data structure.
* @cmnd: Pointer to scsi_cmnd data structure.
*
* This routine removes a scsi buffer from head of @phba lpfc_scsi_buf_list list
* and returns to caller.
*
* Return codes:
* NULL - Error
* Pointer to lpfc_scsi_buf - Success
**/
static struct lpfc_io_buf *
lpfc_get_scsi_buf_s3(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp,
struct scsi_cmnd *cmnd)
{
struct lpfc_io_buf *lpfc_cmd = NULL;
struct list_head *scsi_buf_list_get = &phba->lpfc_scsi_buf_list_get;
unsigned long iflag = 0;
spin_lock_irqsave(&phba->scsi_buf_list_get_lock, iflag);
list_remove_head(scsi_buf_list_get, lpfc_cmd, struct lpfc_io_buf,
list);
if (!lpfc_cmd) {
spin_lock(&phba->scsi_buf_list_put_lock);
list_splice(&phba->lpfc_scsi_buf_list_put,
&phba->lpfc_scsi_buf_list_get);
INIT_LIST_HEAD(&phba->lpfc_scsi_buf_list_put);
list_remove_head(scsi_buf_list_get, lpfc_cmd,
struct lpfc_io_buf, list);
spin_unlock(&phba->scsi_buf_list_put_lock);
}
spin_unlock_irqrestore(&phba->scsi_buf_list_get_lock, iflag);
if (lpfc_ndlp_check_qdepth(phba, ndlp) && lpfc_cmd) {
atomic_inc(&ndlp->cmd_pending);
lpfc_cmd->flags |= LPFC_SBUF_BUMP_QDEPTH;
}
return lpfc_cmd;
}
/**
* lpfc_get_scsi_buf_s4 - Get a scsi buffer from io_buf_list of the HBA
* @phba: The HBA for which this call is being executed.
* @ndlp: pointer to a node-list data structure.
* @cmnd: Pointer to scsi_cmnd data structure.
*
* This routine removes a scsi buffer from head of @hdwq io_buf_list
* and returns to caller.
*
* Return codes:
* NULL - Error
* Pointer to lpfc_scsi_buf - Success
**/
static struct lpfc_io_buf *
lpfc_get_scsi_buf_s4(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp,
struct scsi_cmnd *cmnd)
{
struct lpfc_io_buf *lpfc_cmd;
struct lpfc_sli4_hdw_queue *qp;
struct sli4_sge *sgl;
dma_addr_t pdma_phys_fcp_rsp;
dma_addr_t pdma_phys_fcp_cmd;
uint32_t cpu, idx;
int tag;
struct fcp_cmd_rsp_buf *tmp = NULL;
cpu = raw_smp_processor_id();
if (cmnd && phba->cfg_fcp_io_sched == LPFC_FCP_SCHED_BY_HDWQ) {
tag = blk_mq_unique_tag(scsi_cmd_to_rq(cmnd));
idx = blk_mq_unique_tag_to_hwq(tag);
} else {
idx = phba->sli4_hba.cpu_map[cpu].hdwq;
}
lpfc_cmd = lpfc_get_io_buf(phba, ndlp, idx,
!phba->cfg_xri_rebalancing);
if (!lpfc_cmd) {
qp = &phba->sli4_hba.hdwq[idx];
qp->empty_io_bufs++;
return NULL;
}
/* Setup key fields in buffer that may have been changed
* if other protocols used this buffer.
*/
lpfc_cmd->cur_iocbq.cmd_flag = LPFC_IO_FCP;
lpfc_cmd->prot_seg_cnt = 0;
lpfc_cmd->seg_cnt = 0;
lpfc_cmd->timeout = 0;
lpfc_cmd->flags = 0;
lpfc_cmd->start_time = jiffies;
lpfc_cmd->waitq = NULL;
lpfc_cmd->cpu = cpu;
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
lpfc_cmd->prot_data_type = 0;
#endif
tmp = lpfc_get_cmd_rsp_buf_per_hdwq(phba, lpfc_cmd);
if (!tmp) {
lpfc_release_io_buf(phba, lpfc_cmd, lpfc_cmd->hdwq);
return NULL;
}
lpfc_cmd->fcp_cmnd = tmp->fcp_cmnd;
lpfc_cmd->fcp_rsp = tmp->fcp_rsp;
/*
* The first two SGEs are the FCP_CMD and FCP_RSP.
* The balance are sg list bdes. Initialize the
* first two and leave the rest for queuecommand.
*/
sgl = (struct sli4_sge *)lpfc_cmd->dma_sgl;
pdma_phys_fcp_cmd = tmp->fcp_cmd_rsp_dma_handle;
sgl->addr_hi = cpu_to_le32(putPaddrHigh(pdma_phys_fcp_cmd));
sgl->addr_lo = cpu_to_le32(putPaddrLow(pdma_phys_fcp_cmd));
sgl->word2 = le32_to_cpu(sgl->word2);
bf_set(lpfc_sli4_sge_last, sgl, 0);
sgl->word2 = cpu_to_le32(sgl->word2);
sgl->sge_len = cpu_to_le32(sizeof(struct fcp_cmnd));
sgl++;
/* Setup the physical region for the FCP RSP */
pdma_phys_fcp_rsp = pdma_phys_fcp_cmd + sizeof(struct fcp_cmnd);
sgl->addr_hi = cpu_to_le32(putPaddrHigh(pdma_phys_fcp_rsp));
sgl->addr_lo = cpu_to_le32(putPaddrLow(pdma_phys_fcp_rsp));
sgl->word2 = le32_to_cpu(sgl->word2);
bf_set(lpfc_sli4_sge_last, sgl, 1);
sgl->word2 = cpu_to_le32(sgl->word2);
sgl->sge_len = cpu_to_le32(sizeof(struct fcp_rsp));
if (lpfc_ndlp_check_qdepth(phba, ndlp)) {
atomic_inc(&ndlp->cmd_pending);
lpfc_cmd->flags |= LPFC_SBUF_BUMP_QDEPTH;
}
return lpfc_cmd;
}
/**
* lpfc_get_scsi_buf - Get a scsi buffer from lpfc_scsi_buf_list of the HBA
* @phba: The HBA for which this call is being executed.
* @ndlp: pointer to a node-list data structure.
* @cmnd: Pointer to scsi_cmnd data structure.
*
* This routine removes a scsi buffer from head of @phba lpfc_scsi_buf_list list
* and returns to caller.
*
* Return codes:
* NULL - Error
* Pointer to lpfc_scsi_buf - Success
**/
static struct lpfc_io_buf*
lpfc_get_scsi_buf(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp,
struct scsi_cmnd *cmnd)
{
return phba->lpfc_get_scsi_buf(phba, ndlp, cmnd);
}
/**
* lpfc_release_scsi_buf_s3 - Return a scsi buffer back to hba scsi buf list
* @phba: The Hba for which this call is being executed.
* @psb: The scsi buffer which is being released.
*
* This routine releases @psb scsi buffer by adding it to tail of @phba
* lpfc_scsi_buf_list list.
**/
static void
lpfc_release_scsi_buf_s3(struct lpfc_hba *phba, struct lpfc_io_buf *psb)
{
unsigned long iflag = 0;
psb->seg_cnt = 0;
psb->prot_seg_cnt = 0;
spin_lock_irqsave(&phba->scsi_buf_list_put_lock, iflag);
psb->pCmd = NULL;
psb->cur_iocbq.cmd_flag = LPFC_IO_FCP;
list_add_tail(&psb->list, &phba->lpfc_scsi_buf_list_put);
spin_unlock_irqrestore(&phba->scsi_buf_list_put_lock, iflag);
}
/**
* lpfc_release_scsi_buf_s4: Return a scsi buffer back to hba scsi buf list.
* @phba: The Hba for which this call is being executed.
* @psb: The scsi buffer which is being released.
*
* This routine releases @psb scsi buffer by adding it to tail of @hdwq
* io_buf_list list. For SLI4 XRI's are tied to the scsi buffer
* and cannot be reused for at least RA_TOV amount of time if it was
* aborted.
**/
static void
lpfc_release_scsi_buf_s4(struct lpfc_hba *phba, struct lpfc_io_buf *psb)
{
struct lpfc_sli4_hdw_queue *qp;
unsigned long iflag = 0;
psb->seg_cnt = 0;
psb->prot_seg_cnt = 0;
qp = psb->hdwq;
if (psb->flags & LPFC_SBUF_XBUSY) {
spin_lock_irqsave(&qp->abts_io_buf_list_lock, iflag);
if (!phba->cfg_fcp_wait_abts_rsp)
psb->pCmd = NULL;
list_add_tail(&psb->list, &qp->lpfc_abts_io_buf_list);
qp->abts_scsi_io_bufs++;
spin_unlock_irqrestore(&qp->abts_io_buf_list_lock, iflag);
} else {
lpfc_release_io_buf(phba, (struct lpfc_io_buf *)psb, qp);
}
}
/**
* lpfc_release_scsi_buf: Return a scsi buffer back to hba scsi buf list.
* @phba: The Hba for which this call is being executed.
* @psb: The scsi buffer which is being released.
*
* This routine releases @psb scsi buffer by adding it to tail of @phba
* lpfc_scsi_buf_list list.
**/
static void
lpfc_release_scsi_buf(struct lpfc_hba *phba, struct lpfc_io_buf *psb)
{
if ((psb->flags & LPFC_SBUF_BUMP_QDEPTH) && psb->ndlp)
atomic_dec(&psb->ndlp->cmd_pending);
psb->flags &= ~LPFC_SBUF_BUMP_QDEPTH;
phba->lpfc_release_scsi_buf(phba, psb);
}
/**
* lpfc_fcpcmd_to_iocb - copy the fcp_cmd data into the IOCB
* @data: A pointer to the immediate command data portion of the IOCB.
* @fcp_cmnd: The FCP Command that is provided by the SCSI layer.
*
* The routine copies the entire FCP command from @fcp_cmnd to @data while
* byte swapping the data to big endian format for transmission on the wire.
**/
static void
lpfc_fcpcmd_to_iocb(u8 *data, struct fcp_cmnd *fcp_cmnd)
{
int i, j;
for (i = 0, j = 0; i < sizeof(struct fcp_cmnd);
i += sizeof(uint32_t), j++) {
((uint32_t *)data)[j] = cpu_to_be32(((uint32_t *)fcp_cmnd)[j]);
}
}
/**
* lpfc_scsi_prep_dma_buf_s3 - DMA mapping for scsi buffer to SLI3 IF spec
* @phba: The Hba for which this call is being executed.
* @lpfc_cmd: The scsi buffer which is going to be mapped.
*
* This routine does the pci dma mapping for scatter-gather list of scsi cmnd
* field of @lpfc_cmd for device with SLI-3 interface spec. This routine scans
* through sg elements and format the bde. This routine also initializes all
* IOCB fields which are dependent on scsi command request buffer.
*
* Return codes:
* 1 - Error
* 0 - Success
**/
static int
lpfc_scsi_prep_dma_buf_s3(struct lpfc_hba *phba, struct lpfc_io_buf *lpfc_cmd)
{
struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
struct scatterlist *sgel = NULL;
struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
struct ulp_bde64 *bpl = (struct ulp_bde64 *)lpfc_cmd->dma_sgl;
struct lpfc_iocbq *iocbq = &lpfc_cmd->cur_iocbq;
IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
struct ulp_bde64 *data_bde = iocb_cmd->unsli3.fcp_ext.dbde;
dma_addr_t physaddr;
uint32_t num_bde = 0;
int nseg, datadir = scsi_cmnd->sc_data_direction;
/*
* There are three possibilities here - use scatter-gather segment, use
* the single mapping, or neither. Start the lpfc command prep by
* bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
* data bde entry.
*/
bpl += 2;
if (scsi_sg_count(scsi_cmnd)) {
/*
* The driver stores the segment count returned from dma_map_sg
* because this a count of dma-mappings used to map the use_sg
* pages. They are not guaranteed to be the same for those
* architectures that implement an IOMMU.
*/
nseg = dma_map_sg(&phba->pcidev->dev, scsi_sglist(scsi_cmnd),
scsi_sg_count(scsi_cmnd), datadir);
if (unlikely(!nseg))
return 1;
lpfc_cmd->seg_cnt = nseg;
if (lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt) {
lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
"9064 BLKGRD: %s: Too many sg segments"
" from dma_map_sg. Config %d, seg_cnt"
" %d\n", __func__, phba->cfg_sg_seg_cnt,
lpfc_cmd->seg_cnt);
WARN_ON_ONCE(lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt);
lpfc_cmd->seg_cnt = 0;
scsi_dma_unmap(scsi_cmnd);
return 2;
}
/*
* The driver established a maximum scatter-gather segment count
* during probe that limits the number of sg elements in any
* single scsi command. Just run through the seg_cnt and format
* the bde's.
* When using SLI-3 the driver will try to fit all the BDEs into
* the IOCB. If it can't then the BDEs get added to a BPL as it
* does for SLI-2 mode.
*/
scsi_for_each_sg(scsi_cmnd, sgel, nseg, num_bde) {
physaddr = sg_dma_address(sgel);
if (phba->sli_rev == 3 &&
!(phba->sli3_options & LPFC_SLI3_BG_ENABLED) &&
!(iocbq->cmd_flag & DSS_SECURITY_OP) &&
nseg <= LPFC_EXT_DATA_BDE_COUNT) {
data_bde->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
data_bde->tus.f.bdeSize = sg_dma_len(sgel);
data_bde->addrLow = putPaddrLow(physaddr);
data_bde->addrHigh = putPaddrHigh(physaddr);
data_bde++;
} else {
bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
bpl->tus.f.bdeSize = sg_dma_len(sgel);
bpl->tus.w = le32_to_cpu(bpl->tus.w);
bpl->addrLow =
le32_to_cpu(putPaddrLow(physaddr));
bpl->addrHigh =
le32_to_cpu(putPaddrHigh(physaddr));
bpl++;
}
}
}
/*
* Finish initializing those IOCB fields that are dependent on the
* scsi_cmnd request_buffer. Note that for SLI-2 the bdeSize is
* explicitly reinitialized and for SLI-3 the extended bde count is
* explicitly reinitialized since all iocb memory resources are reused.
*/
if (phba->sli_rev == 3 &&
!(phba->sli3_options & LPFC_SLI3_BG_ENABLED) &&
!(iocbq->cmd_flag & DSS_SECURITY_OP)) {
if (num_bde > LPFC_EXT_DATA_BDE_COUNT) {
/*
* The extended IOCB format can only fit 3 BDE or a BPL.
* This I/O has more than 3 BDE so the 1st data bde will
* be a BPL that is filled in here.
*/
physaddr = lpfc_cmd->dma_handle;
data_bde->tus.f.bdeFlags = BUFF_TYPE_BLP_64;
data_bde->tus.f.bdeSize = (num_bde *
sizeof(struct ulp_bde64));
physaddr += (sizeof(struct fcp_cmnd) +
sizeof(struct fcp_rsp) +
(2 * sizeof(struct ulp_bde64)));
data_bde->addrHigh = putPaddrHigh(physaddr);
data_bde->addrLow = putPaddrLow(physaddr);
/* ebde count includes the response bde and data bpl */
iocb_cmd->unsli3.fcp_ext.ebde_count = 2;
} else {
/* ebde count includes the response bde and data bdes */
iocb_cmd->unsli3.fcp_ext.ebde_count = (num_bde + 1);
}
} else {
iocb_cmd->un.fcpi64.bdl.bdeSize =
((num_bde + 2) * sizeof(struct ulp_bde64));
iocb_cmd->unsli3.fcp_ext.ebde_count = (num_bde + 1);
}
fcp_cmnd->fcpDl = cpu_to_be32(scsi_bufflen(scsi_cmnd));
/*
* Due to difference in data length between DIF/non-DIF paths,
* we need to set word 4 of IOCB here
*/
iocb_cmd->un.fcpi.fcpi_parm = scsi_bufflen(scsi_cmnd);
lpfc_fcpcmd_to_iocb(iocb_cmd->unsli3.fcp_ext.icd, fcp_cmnd);
return 0;
}
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
/* Return BG_ERR_INIT if error injection is detected by Initiator */
#define BG_ERR_INIT 0x1
/* Return BG_ERR_TGT if error injection is detected by Target */
#define BG_ERR_TGT 0x2
/* Return BG_ERR_SWAP if swapping CSUM<-->CRC is required for error injection */
#define BG_ERR_SWAP 0x10
/*