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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) 2004-2015 Emulex. All rights reserved. *
* EMULEX and SLI are trademarks of Emulex. *
* www.emulex.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/crc-t10dif.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
int _dump_buf_done = 1;
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_scsi_buf *psb);
static void
lpfc_release_scsi_buf_s3(struct lpfc_hba *phba, struct lpfc_scsi_buf *psb);
static int
lpfc_prot_group_type(struct lpfc_hba *phba, struct scsi_cmnd *sc);
static void
lpfc_debug_save_data(struct lpfc_hba *phba, struct scsi_cmnd *cmnd)
{
void *src, *dst;
struct scatterlist *sgde = scsi_sglist(cmnd);
if (!_dump_buf_data) {
lpfc_printf_log(phba, KERN_ERR, LOG_BG,
"9050 BLKGRD: ERROR %s _dump_buf_data is NULL\n",
__func__);
return;
}
if (!sgde) {
lpfc_printf_log(phba, KERN_ERR, LOG_BG,
"9051 BLKGRD: ERROR: data scatterlist is null\n");
return;
}
dst = (void *) _dump_buf_data;
while (sgde) {
src = sg_virt(sgde);
memcpy(dst, src, sgde->length);
dst += sgde->length;
sgde = sg_next(sgde);
}
}
static void
lpfc_debug_save_dif(struct lpfc_hba *phba, struct scsi_cmnd *cmnd)
{
void *src, *dst;
struct scatterlist *sgde = scsi_prot_sglist(cmnd);
if (!_dump_buf_dif) {
lpfc_printf_log(phba, KERN_ERR, LOG_BG,
"9052 BLKGRD: ERROR %s _dump_buf_data is NULL\n",
__func__);
return;
}
if (!sgde) {
lpfc_printf_log(phba, KERN_ERR, LOG_BG,
"9053 BLKGRD: ERROR: prot scatterlist is null\n");
return;
}
dst = _dump_buf_dif;
while (sgde) {
src = sg_virt(sgde);
memcpy(dst, src, sgde->length);
dst += sgde->length;
sgde = sg_next(sgde);
}
}
static inline unsigned
lpfc_cmd_blksize(struct scsi_cmnd *sc)
{
return sc->device->sector_size;
}
#define LPFC_CHECK_PROTECT_GUARD 1
#define LPFC_CHECK_PROTECT_REF 2
static inline unsigned
lpfc_cmd_protect(struct scsi_cmnd *sc, int flag)
{
return 1;
}
static inline unsigned
lpfc_cmd_guard_csum(struct scsi_cmnd *sc)
{
if (lpfc_prot_group_type(NULL, sc) == LPFC_PG_TYPE_NO_DIF)
return 0;
if (scsi_host_get_guard(sc->device->host) == SHOST_DIX_GUARD_IP)
return 1;
return 0;
}
/**
* 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_scsi_buf *lpfc_cmd)
{
struct sli4_sge *sgl = (struct sli4_sge *)lpfc_cmd->fcp_bpl;
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);
}
}
/**
* lpfc_update_stats - Update statistical data for the command completion
* @phba: Pointer to HBA object.
* @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_hba *phba, struct lpfc_scsi_buf *lpfc_cmd)
{
struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
struct lpfc_nodelist *pnode = rdata->pnode;
struct scsi_cmnd *cmd = lpfc_cmd->pCmd;
unsigned long flags;
struct Scsi_Host *shost = cmd->device->host;
struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
unsigned long latency;
int i;
if (cmd->result)
return;
latency = jiffies_to_msecs((long)jiffies - (long)lpfc_cmd->start_time);
spin_lock_irqsave(shost->host_lock, flags);
if (!vport->stat_data_enabled ||
vport->stat_data_blocked ||
!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_allocate: 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_scsi_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_bpl;
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_scsi_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 = pci_pool_alloc(phba->lpfc_scsi_dma_buf_pool,
GFP_KERNEL, &psb->dma_handle);
if (!psb->data) {
kfree(psb);
break;
}
/* Initialize virtual ptrs to dma_buf region. */
memset(psb->data, 0, phba->cfg_sg_dma_buf_size);
/* Allocate iotag for psb->cur_iocbq. */
iotag = lpfc_sli_next_iotag(phba, &psb->cur_iocbq);
if (iotag == 0) {
pci_pool_free(phba->lpfc_scsi_dma_buf_pool,
psb->data, psb->dma_handle);
kfree(psb);
break;
}
psb->cur_iocbq.iocb_flag |= LPFC_IO_FCP;
psb->fcp_cmnd = psb->data;
psb->fcp_rsp = psb->data + sizeof(struct fcp_cmnd);
psb->fcp_bpl = psb->data + sizeof(struct fcp_cmnd) +
sizeof(struct fcp_rsp);
/* Initialize local short-hand pointers. */
bpl = psb->fcp_bpl;
pdma_phys_fcp_cmd = psb->dma_handle;
pdma_phys_fcp_rsp = psb->dma_handle + sizeof(struct fcp_cmnd);
pdma_phys_bpl = 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_bpl);
iocb->un.fcpi64.bdl.addrHigh =
putPaddrHigh(pdma_phys_bpl);
iocb->ulpBdeCount = 1;
iocb->ulpLe = 1;
}
iocb->ulpClass = CLASS3;
psb->status = IOSTAT_SUCCESS;
/* Put it back into the SCSI buffer list */
psb->cur_iocbq.context1 = psb;
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_scsi_buf *psb, *next_psb;
unsigned long iflag = 0;
spin_lock_irqsave(&phba->hbalock, iflag);
spin_lock(&phba->sli4_hba.abts_scsi_buf_list_lock);
list_for_each_entry_safe(psb, next_psb,
&phba->sli4_hba.lpfc_abts_scsi_buf_list, list) {
if (psb->rdata && psb->rdata->pnode
&& psb->rdata->pnode->vport == vport)
psb->rdata = NULL;
}
spin_unlock(&phba->sli4_hba.abts_scsi_buf_list_lock);
spin_unlock_irqrestore(&phba->hbalock, iflag);
}
/**
* lpfc_sli4_fcp_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.
*
* This routine is invoked by the worker thread to process a SLI4 fast-path
* FCP aborted xri.
**/
void
lpfc_sli4_fcp_xri_aborted(struct lpfc_hba *phba,
struct sli4_wcqe_xri_aborted *axri)
{
uint16_t xri = bf_get(lpfc_wcqe_xa_xri, axri);
uint16_t rxid = bf_get(lpfc_wcqe_xa_remote_xid, axri);
struct lpfc_scsi_buf *psb, *next_psb;
unsigned long iflag = 0;
struct lpfc_iocbq *iocbq;
int i;
struct lpfc_nodelist *ndlp;
int rrq_empty = 0;
struct lpfc_sli_ring *pring = &phba->sli.ring[LPFC_ELS_RING];
spin_lock_irqsave(&phba->hbalock, iflag);
spin_lock(&phba->sli4_hba.abts_scsi_buf_list_lock);
list_for_each_entry_safe(psb, next_psb,
&phba->sli4_hba.lpfc_abts_scsi_buf_list, list) {
if (psb->cur_iocbq.sli4_xritag == xri) {
list_del(&psb->list);
psb->exch_busy = 0;
psb->status = IOSTAT_SUCCESS;
spin_unlock(
&phba->sli4_hba.abts_scsi_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) {
lpfc_set_rrq_active(phba, ndlp,
psb->cur_iocbq.sli4_lxritag, rxid, 1);
lpfc_sli4_abts_err_handler(phba, ndlp, axri);
}
lpfc_release_scsi_buf_s4(phba, psb);
if (rrq_empty)
lpfc_worker_wake_up(phba);
return;
}
}
spin_unlock(&phba->sli4_hba.abts_scsi_buf_list_lock);
for (i = 1; i <= phba->sli.last_iotag; i++) {
iocbq = phba->sli.iocbq_lookup[i];
if (!(iocbq->iocb_flag & LPFC_IO_FCP) ||
(iocbq->iocb_flag & LPFC_IO_LIBDFC))
continue;
if (iocbq->sli4_xritag != xri)
continue;
psb = container_of(iocbq, struct lpfc_scsi_buf, cur_iocbq);
psb->exch_busy = 0;
spin_unlock_irqrestore(&phba->hbalock, iflag);
if (!list_empty(&pring->txq))
lpfc_worker_wake_up(phba);
return;
}
spin_unlock_irqrestore(&phba->hbalock, iflag);
}
/**
* lpfc_sli4_post_scsi_sgl_list - Psot blocks of scsi buffer sgls from a list
* @phba: pointer to lpfc hba data structure.
* @post_sblist: pointer to the scsi buffer list.
*
* This routine walks a list of scsi buffers that was passed in. It attempts
* to construct blocks of scsi buffer sgls which contains contiguous xris and
* uses the non-embedded SGL block post mailbox commands to post to the port.
* For single SCSI buffer sgl with non-contiguous xri, if any, it shall use
* embedded SGL post mailbox command for posting. The @post_sblist passed in
* must be local list, thus no lock is needed when manipulate the list.
*
* Returns: 0 = failure, non-zero number of successfully posted buffers.
**/
static int
lpfc_sli4_post_scsi_sgl_list(struct lpfc_hba *phba,
struct list_head *post_sblist, int sb_count)
{
struct lpfc_scsi_buf *psb, *psb_next;
int status, sgl_size;
int post_cnt = 0, block_cnt = 0, num_posting = 0, num_posted = 0;
dma_addr_t pdma_phys_bpl1;
int last_xritag = NO_XRI;
LIST_HEAD(prep_sblist);
LIST_HEAD(blck_sblist);
LIST_HEAD(scsi_sblist);
/* sanity check */
if (sb_count <= 0)
return -EINVAL;
sgl_size = phba->cfg_sg_dma_buf_size -
(sizeof(struct fcp_cmnd) + sizeof(struct fcp_rsp));
list_for_each_entry_safe(psb, psb_next, post_sblist, list) {
list_del_init(&psb->list);
block_cnt++;
if ((last_xritag != NO_XRI) &&
(psb->cur_iocbq.sli4_xritag != last_xritag + 1)) {
/* a hole in xri block, form a sgl posting block */
list_splice_init(&prep_sblist, &blck_sblist);
post_cnt = block_cnt - 1;
/* prepare list for next posting block */
list_add_tail(&psb->list, &prep_sblist);
block_cnt = 1;
} else {
/* prepare list for next posting block */
list_add_tail(&psb->list, &prep_sblist);
/* enough sgls for non-embed sgl mbox command */
if (block_cnt == LPFC_NEMBED_MBOX_SGL_CNT) {
list_splice_init(&prep_sblist, &blck_sblist);
post_cnt = block_cnt;
block_cnt = 0;
}
}
num_posting++;
last_xritag = psb->cur_iocbq.sli4_xritag;
/* end of repost sgl list condition for SCSI buffers */
if (num_posting == sb_count) {
if (post_cnt == 0) {
/* last sgl posting block */
list_splice_init(&prep_sblist, &blck_sblist);
post_cnt = block_cnt;
} else if (block_cnt == 1) {
/* last single sgl with non-contiguous xri */
if (sgl_size > SGL_PAGE_SIZE)
pdma_phys_bpl1 = psb->dma_phys_bpl +
SGL_PAGE_SIZE;
else
pdma_phys_bpl1 = 0;
status = lpfc_sli4_post_sgl(phba,
psb->dma_phys_bpl,
pdma_phys_bpl1,
psb->cur_iocbq.sli4_xritag);
if (status) {
/* failure, put on abort scsi list */
psb->exch_busy = 1;
} else {
/* success, put on SCSI buffer list */
psb->exch_busy = 0;
psb->status = IOSTAT_SUCCESS;
num_posted++;
}
/* success, put on SCSI buffer sgl list */
list_add_tail(&psb->list, &scsi_sblist);
}
}
/* continue until a nembed page worth of sgls */
if (post_cnt == 0)
continue;
/* post block of SCSI buffer list sgls */
status = lpfc_sli4_post_scsi_sgl_block(phba, &blck_sblist,
post_cnt);
/* don't reset xirtag due to hole in xri block */
if (block_cnt == 0)
last_xritag = NO_XRI;
/* reset SCSI buffer post count for next round of posting */
post_cnt = 0;
/* put posted SCSI buffer-sgl posted on SCSI buffer sgl list */
while (!list_empty(&blck_sblist)) {
list_remove_head(&blck_sblist, psb,
struct lpfc_scsi_buf, list);
if (status) {
/* failure, put on abort scsi list */
psb->exch_busy = 1;
} else {
/* success, put on SCSI buffer list */
psb->exch_busy = 0;
psb->status = IOSTAT_SUCCESS;
num_posted++;
}
list_add_tail(&psb->list, &scsi_sblist);
}
}
/* Push SCSI buffers with sgl posted to the availble list */
while (!list_empty(&scsi_sblist)) {
list_remove_head(&scsi_sblist, psb,
struct lpfc_scsi_buf, list);
lpfc_release_scsi_buf_s4(phba, psb);
}
return num_posted;
}
/**
* lpfc_sli4_repost_scsi_sgl_list - Repsot all the allocated scsi buffer sgls
* @phba: pointer to lpfc hba data structure.
*
* This routine walks the list of scsi buffers that have been allocated and
* repost them to the port by using SGL block post. This is needed after a
* pci_function_reset/warm_start or start. The lpfc_hba_down_post_s4 routine
* is responsible for moving all scsi buffers on the lpfc_abts_scsi_sgl_list
* to the lpfc_scsi_buf_list. If the repost fails, reject all scsi buffers.
*
* Returns: 0 = success, non-zero failure.
**/
int
lpfc_sli4_repost_scsi_sgl_list(struct lpfc_hba *phba)
{
LIST_HEAD(post_sblist);
int num_posted, rc = 0;
/* get all SCSI buffers need to repost to a local list */
spin_lock_irq(&phba->scsi_buf_list_get_lock);
spin_lock(&phba->scsi_buf_list_put_lock);
list_splice_init(&phba->lpfc_scsi_buf_list_get, &post_sblist);
list_splice(&phba->lpfc_scsi_buf_list_put, &post_sblist);
spin_unlock(&phba->scsi_buf_list_put_lock);
spin_unlock_irq(&phba->scsi_buf_list_get_lock);
/* post the list of scsi buffer sgls to port if available */
if (!list_empty(&post_sblist)) {
num_posted = lpfc_sli4_post_scsi_sgl_list(phba, &post_sblist,
phba->sli4_hba.scsi_xri_cnt);
/* failed to post any scsi buffer, return error */
if (num_posted == 0)
rc = -EIO;
}
return rc;
}
/**
* lpfc_new_scsi_buf_s4 - Scsi buffer allocator for HBA with SLI4 IF spec
* @vport: The virtual port for which this call being executed.
* @num_to_allocate: The requested number of buffers to allocate.
*
* This routine allocates scsi buffers for device with SLI-4 interface spec,
* the scsi buffer contains all the necessary information needed to initiate
* a SCSI I/O. After allocating up to @num_to_allocate SCSI buffers and put
* them on a list, it post them to the port by using SGL block post.
*
* Return codes:
* int - number of scsi buffers that were allocated and posted.
* 0 = failure, less than num_to_alloc is a partial failure.
**/
static int
lpfc_new_scsi_buf_s4(struct lpfc_vport *vport, int num_to_alloc)
{
struct lpfc_hba *phba = vport->phba;
struct lpfc_scsi_buf *psb;
struct sli4_sge *sgl;
IOCB_t *iocb;
dma_addr_t pdma_phys_fcp_cmd;
dma_addr_t pdma_phys_fcp_rsp;
dma_addr_t pdma_phys_bpl;
uint16_t iotag, lxri = 0;
int bcnt, num_posted, sgl_size;
LIST_HEAD(prep_sblist);
LIST_HEAD(post_sblist);
LIST_HEAD(scsi_sblist);
sgl_size = phba->cfg_sg_dma_buf_size -
(sizeof(struct fcp_cmnd) + sizeof(struct fcp_rsp));
lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
"9068 ALLOC %d scsi_bufs: %d (%d + %d + %d)\n",
num_to_alloc, phba->cfg_sg_dma_buf_size, sgl_size,
(int)sizeof(struct fcp_cmnd),
(int)sizeof(struct fcp_rsp));
for (bcnt = 0; bcnt < num_to_alloc; bcnt++) {
psb = kzalloc(sizeof(struct lpfc_scsi_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 = pci_pool_alloc(phba->lpfc_scsi_dma_buf_pool,
GFP_KERNEL, &psb->dma_handle);
if (!psb->data) {
kfree(psb);
break;
}
memset(psb->data, 0, phba->cfg_sg_dma_buf_size);
/*
* 4K Page alignment is CRITICAL to BlockGuard, double check
* to be sure.
*/
if (phba->cfg_enable_bg && (((unsigned long)(psb->data) &
(unsigned long)(SLI4_PAGE_SIZE - 1)) != 0)) {
pci_pool_free(phba->lpfc_scsi_dma_buf_pool,
psb->data, psb->dma_handle);
kfree(psb);
break;
}
lxri = lpfc_sli4_next_xritag(phba);
if (lxri == NO_XRI) {
pci_pool_free(phba->lpfc_scsi_dma_buf_pool,
psb->data, psb->dma_handle);
kfree(psb);
break;
}
/* Allocate iotag for psb->cur_iocbq. */
iotag = lpfc_sli_next_iotag(phba, &psb->cur_iocbq);
if (iotag == 0) {
pci_pool_free(phba->lpfc_scsi_dma_buf_pool,
psb->data, psb->dma_handle);
kfree(psb);
lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
"3368 Failed to allocated IOTAG for"
" XRI:0x%x\n", lxri);
lpfc_sli4_free_xri(phba, lxri);
break;
}
psb->cur_iocbq.sli4_lxritag = lxri;
psb->cur_iocbq.sli4_xritag = phba->sli4_hba.xri_ids[lxri];
psb->cur_iocbq.iocb_flag |= LPFC_IO_FCP;
psb->fcp_bpl = psb->data;
psb->fcp_cmnd = (psb->data + sgl_size);
psb->fcp_rsp = (struct fcp_rsp *)((uint8_t *)psb->fcp_cmnd +
sizeof(struct fcp_cmnd));
/* Initialize local short-hand pointers. */
sgl = (struct sli4_sge *)psb->fcp_bpl;
pdma_phys_bpl = psb->dma_handle;
pdma_phys_fcp_cmd = (psb->dma_handle + sgl_size);
pdma_phys_fcp_rsp = pdma_phys_fcp_cmd + sizeof(struct fcp_cmnd);
/*
* 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.
*/
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 */
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));
/*
* 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;
iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BDE_64;
/* setting the BLP size to 2 * sizeof BDE may not be correct.
* We are setting the bpl to point to out sgl. An sgl's
* entries are 16 bytes, a bpl entries are 12 bytes.
*/
iocb->un.fcpi64.bdl.bdeSize = sizeof(struct fcp_cmnd);
iocb->un.fcpi64.bdl.addrLow = putPaddrLow(pdma_phys_fcp_cmd);
iocb->un.fcpi64.bdl.addrHigh = putPaddrHigh(pdma_phys_fcp_cmd);
iocb->ulpBdeCount = 1;
iocb->ulpLe = 1;
iocb->ulpClass = CLASS3;
psb->cur_iocbq.context1 = psb;
psb->dma_phys_bpl = pdma_phys_bpl;
/* add the scsi buffer to a post list */
list_add_tail(&psb->list, &post_sblist);
spin_lock_irq(&phba->scsi_buf_list_get_lock);
phba->sli4_hba.scsi_xri_cnt++;
spin_unlock_irq(&phba->scsi_buf_list_get_lock);
}
lpfc_printf_log(phba, KERN_INFO, LOG_BG,
"3021 Allocate %d out of %d requested new SCSI "
"buffers\n", bcnt, num_to_alloc);
/* post the list of scsi buffer sgls to port if available */
if (!list_empty(&post_sblist))
num_posted = lpfc_sli4_post_scsi_sgl_list(phba,
&post_sblist, bcnt);
else
num_posted = 0;
return num_posted;
}
/**
* lpfc_new_scsi_buf - Wrapper funciton for scsi buffer allocator
* @vport: The virtual port for which this call being executed.
* @num_to_allocate: The requested number of buffers to allocate.
*
* This routine wraps the actual SCSI buffer allocator function pointer from
* the lpfc_hba struct.
*
* Return codes:
* int - number of scsi buffers that were allocated.
* 0 = failure, less than num_to_alloc is a partial failure.
**/
static inline int
lpfc_new_scsi_buf(struct lpfc_vport *vport, int num_to_alloc)
{
return vport->phba->lpfc_new_scsi_buf(vport, num_to_alloc);
}
/**
* 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.
*
* 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_scsi_buf*
lpfc_get_scsi_buf_s3(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp)
{
struct lpfc_scsi_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_scsi_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_scsi_buf, list);
spin_unlock(&phba->scsi_buf_list_put_lock);
}
spin_unlock_irqrestore(&phba->scsi_buf_list_get_lock, iflag);
return lpfc_cmd;
}
/**
* lpfc_get_scsi_buf_s4 - Get a scsi buffer from lpfc_scsi_buf_list of the HBA
* @phba: The HBA for which this call is being executed.
*
* 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