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scsi: lpfc: Remove lock contention target write path

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Lower IOps performance with write operations. Perf tool shows lock
contention in dma_pool_alloc and dma_pool_free related to the
txrdy_payload_pool.

The allocations are for dma buffers for XFER_RDY's, which actually are not
needed for the FCP_TRECEIVE command as the command contents are used by the
adapter to generate the IU.

Remove the allocations and the associated buffer pool.  Rather than leaving
NULLs in buffer pointer locations, set command and sgl to indicate skipped
SGLE indexes.

Link: https://lore.kernel.org/r/20191018211832.7917-10-jsmart2021@gmail.com
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
James Smart
2019-10-18 14:18:25 -07:00
committed by Martin K. Petersen
parent 22770cbabf
commit ea85a20cd5
5 changed files with 14 additions and 54 deletions
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16
drivers/scsi/lpfc/lpfc_init.c
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@@ -7556,18 +7556,10 @@ lpfc_create_shost(struct lpfc_hba *phba)
if (phba->nvmet_support) {
/* Only 1 vport (pport) will support NVME target */
if (phba->txrdy_payload_pool == NULL) {
phba->txrdy_payload_pool = dma_pool_create(
"txrdy_pool", &phba->pcidev->dev,
TXRDY_PAYLOAD_LEN, 16, 0);
if (phba->txrdy_payload_pool) {
phba->targetport = NULL;
phba->cfg_enable_fc4_type = LPFC_ENABLE_NVME;
lpfc_printf_log(phba, KERN_INFO,
LOG_INIT | LOG_NVME_DISC,
"6076 NVME Target Found\n");
}
}
phba->targetport = NULL;
phba->cfg_enable_fc4_type = LPFC_ENABLE_NVME;
lpfc_printf_log(phba, KERN_INFO, LOG_INIT | LOG_NVME_DISC,
"6076 NVME Target Found\n");
}
lpfc_debugfs_initialize(vport);