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scsi: lpfc: Reduce memory footprint for lpfc_queue

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Currently the driver maintains a sideband structure which has a pointer for
each queue element. However, at 8 bytes per pointer, and up to 4k elements
per queue, and 100s of queues, this can take up a lot of memory.

Convert the driver to using an access routine that calculates the element
address based on its index rather than using the pointer table.

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
2019-03-12 16:30:28 -07:00
committed by Martin K. Petersen
parent 9a66d990c7
commit 9afbee3d62
4 changed files with 36 additions and 46 deletions
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4
drivers/scsi/lpfc/lpfc_debugfs.c
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@@ -4135,7 +4135,7 @@ lpfc_idiag_queacc_read_qe(char *pbuffer, int len, struct lpfc_queue *pque,
"QE-INDEX[%04d]:\n", index);
offset = 0;
pentry = pque->qe[index].address;
pentry = lpfc_sli4_qe(pque, index);
while (esize > 0) {
len += snprintf(pbuffer+len, LPFC_QUE_ACC_BUF_SIZE-len,
"%08x ", *pentry);
@@ -4485,7 +4485,7 @@ pass_check:
pque = (struct lpfc_queue *)idiag.ptr_private;
if (offset > pque->entry_size/sizeof(uint32_t) - 1)
goto error_out;
pentry = pque->qe[index].address;
pentry = lpfc_sli4_qe(pque, index);
pentry += offset;
if (idiag.cmd.opcode == LPFC_IDIAG_CMD_QUEACC_WR)
*pentry = value;