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scsi: lpfc: Move CQ processing to a soft IRQ

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Under heavy target nvme load duration, the lpfc irq handler is
encountering cpu lockup warnings.

Convert the driver to a shortened ISR handler which identifies the
interrupting condition then schedules a workq thread to process the
completion queue the interrupt was for. This moves all the real work
into the workq element.

As nvmet_fc upcalls are no longer in ISR context, don't set the feature
flags

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Dick Kennedy
2017-09-29 17:34:34 -07:00
committed by Martin K. Petersen
parent c8a4ce0bf3
commit f485c18db2
5 changed files with 109 additions and 65 deletions
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4
drivers/scsi/lpfc/lpfc_nvmet.c
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@@ -1156,9 +1156,7 @@ lpfc_nvmet_create_targetport(struct lpfc_hba *phba)
}
lpfc_tgttemplate.max_sgl_segments = phba->cfg_nvme_seg_cnt + 1;
lpfc_tgttemplate.max_hw_queues = phba->cfg_nvme_io_channel;
lpfc_tgttemplate.target_features = NVMET_FCTGTFEAT_READDATA_RSP |
NVMET_FCTGTFEAT_CMD_IN_ISR |
NVMET_FCTGTFEAT_OPDONE_IN_ISR;
lpfc_tgttemplate.target_features = NVMET_FCTGTFEAT_READDATA_RSP;
#if (IS_ENABLED(CONFIG_NVME_TARGET_FC))
error = nvmet_fc_register_targetport(&pinfo, &lpfc_tgttemplate,