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scsi: mpt3sas: Use high iops queues under some circumstances

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The driver will use round-robin method for io submission in batches within
the high iops queues when the number of in-flight ios on the target device
is larger than 8. Otherwise the driver will use low latency reply queues.

Signed-off-by: Suganath Prabu S <suganath-prabu.subramani@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Suganath Prabu S
2019-05-31 08:14:38 -04:00
committed by Martin K. Petersen
父節點 0213651609
當前提交 5dd48a555a
共有 2 個文件被更改，包括 48 次插入 和 2 次删除
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36
drivers/scsi/mpt3sas/mpt3sas_base.c
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@@ -3322,6 +3322,35 @@ _base_get_msix_index(struct MPT3SAS_ADAPTER *ioc,
return ioc->cpu_msix_table[raw_smp_processor_id()];
}
/**
* _base_get_high_iops_msix_index - get the msix index of
* high iops queues
* @ioc: per adapter object
* @scmd: scsi_cmnd object
*
* Returns: msix index of high iops reply queues.
* i.e. high iops reply queue on which IO request's
* reply should be posted by the HBA firmware.
*/
static inline u8
_base_get_high_iops_msix_index(struct MPT3SAS_ADAPTER *ioc,
struct scsi_cmnd *scmd)
{
/**
* Round robin the IO interrupts among the high iops
* reply queues in terms of batch count 16 when outstanding
* IOs on the target device is >=8.
*/
if (atomic_read(&scmd->device->device_busy) >
MPT3SAS_DEVICE_HIGH_IOPS_DEPTH)
return base_mod64((
atomic64_add_return(1, &ioc->high_iops_outstanding) /
MPT3SAS_HIGH_IOPS_BATCH_COUNT),
MPT3SAS_HIGH_IOPS_REPLY_QUEUES);
return _base_get_msix_index(ioc, scmd);
}
/**
* mpt3sas_base_get_smid - obtain a free smid from internal queue
* @ioc: per adapter object
@@ -6707,6 +6736,7 @@ mpt3sas_base_attach(struct MPT3SAS_ADAPTER *ioc)
ioc->build_sg_scmd = &_base_build_sg_scmd;
ioc->build_sg = &_base_build_sg;
ioc->build_zero_len_sge = &_base_build_zero_len_sge;
ioc->get_msix_index_for_smlio = &_base_get_msix_index;
break;
case MPI25_VERSION:
case MPI26_VERSION:
@@ -6721,7 +6751,11 @@ mpt3sas_base_attach(struct MPT3SAS_ADAPTER *ioc)
ioc->build_nvme_prp = &_base_build_nvme_prp;
ioc->build_zero_len_sge = &_base_build_zero_len_sge_ieee;
ioc->sge_size_ieee = sizeof(Mpi2IeeeSgeSimple64_t);
if (ioc->high_iops_queues)
ioc->get_msix_index_for_smlio =
&_base_get_high_iops_msix_index;
else
ioc->get_msix_index_for_smlio = &_base_get_msix_index;
break;
}
if (ioc->atomic_desc_capable) {