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[SCSI] qla4xxx: Remove hiwat code so scsi eh does not get escalated when we can make progress
Removed unnecessary hiwat code to free up the number available IOCBs. Eliminates unnecessary eh_ escalations due to inability to obtain IOCB pkt for marker. v2. - Remove define not used anymore and fix req_q_coun accounting. Signed-off-by: Karen Higgins <karen.higgins@qlogic.com> [michaelc: ported patch from qlogic.com driver to upstream] Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Karen Higgins
James Bottomley
parent
612f734887
commit
16ed55f9de
@ -100,7 +100,6 @@
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#define MAX_SRBS MAX_CMDS_TO_RISC
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#define MBOX_AEN_REG_COUNT 5
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#define MAX_INIT_RETRIES 5
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#define IOCB_HIWAT_CUSHION 16
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/*
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* Buffer sizes
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@ -307,7 +306,6 @@ struct scsi_qla_host {
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uint32_t tot_ddbs;
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uint16_t iocb_cnt;
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uint16_t iocb_hiwat;
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/* SRB cache. */
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#define SRB_MIN_REQ 128
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@ -10,9 +10,42 @@
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#include "ql4_dbg.h"
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#include "ql4_inline.h"
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#include <scsi/scsi_tcq.h>
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static int
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qla4xxx_space_in_req_ring(struct scsi_qla_host *ha, uint16_t req_cnt)
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{
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uint16_t cnt;
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/* Calculate number of free request entries. */
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if ((req_cnt + 2) >= ha->req_q_count) {
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cnt = (uint16_t) le32_to_cpu(ha->shadow_regs->req_q_out);
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if (ha->request_in < cnt)
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ha->req_q_count = cnt - ha->request_in;
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else
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ha->req_q_count = REQUEST_QUEUE_DEPTH -
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(ha->request_in - cnt);
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}
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/* Check if room for request in request ring. */
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if ((req_cnt + 2) < ha->req_q_count)
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return 1;
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else
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return 0;
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}
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static void qla4xxx_advance_req_ring_ptr(struct scsi_qla_host *ha)
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{
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/* Advance request queue pointer */
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if (ha->request_in == (REQUEST_QUEUE_DEPTH - 1)) {
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ha->request_in = 0;
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ha->request_ptr = ha->request_ring;
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} else {
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ha->request_in++;
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ha->request_ptr++;
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}
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}
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/**
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* qla4xxx_get_req_pkt - returns a valid entry in request queue.
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* @ha: Pointer to host adapter structure.
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@ -26,35 +59,18 @@
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static int qla4xxx_get_req_pkt(struct scsi_qla_host *ha,
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struct queue_entry **queue_entry)
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{
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uint16_t request_in;
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uint8_t status = QLA_SUCCESS;
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uint16_t req_cnt = 1;
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*queue_entry = ha->request_ptr;
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/* get the latest request_in and request_out index */
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request_in = ha->request_in;
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ha->request_out = (uint16_t) le32_to_cpu(ha->shadow_regs->req_q_out);
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/* Advance request queue pointer and check for queue full */
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if (request_in == (REQUEST_QUEUE_DEPTH - 1)) {
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request_in = 0;
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ha->request_ptr = ha->request_ring;
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} else {
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request_in++;
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ha->request_ptr++;
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}
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/* request queue is full, try again later */
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if ((ha->iocb_cnt + 1) >= ha->iocb_hiwat) {
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/* restore request pointer */
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ha->request_ptr = *queue_entry;
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status = QLA_ERROR;
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} else {
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ha->request_in = request_in;
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if (qla4xxx_space_in_req_ring(ha, req_cnt)) {
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*queue_entry = ha->request_ptr;
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memset(*queue_entry, 0, sizeof(**queue_entry));
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qla4xxx_advance_req_ring_ptr(ha);
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ha->req_q_count -= req_cnt;
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return QLA_SUCCESS;
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}
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return status;
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return QLA_ERROR;
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}
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/**
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@ -100,21 +116,14 @@ exit_send_marker:
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return status;
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}
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static struct continuation_t1_entry* qla4xxx_alloc_cont_entry(
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struct scsi_qla_host *ha)
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static struct continuation_t1_entry *
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qla4xxx_alloc_cont_entry(struct scsi_qla_host *ha)
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{
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struct continuation_t1_entry *cont_entry;
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cont_entry = (struct continuation_t1_entry *)ha->request_ptr;
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/* Advance request queue pointer */
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if (ha->request_in == (REQUEST_QUEUE_DEPTH - 1)) {
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ha->request_in = 0;
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ha->request_ptr = ha->request_ring;
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} else {
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ha->request_in++;
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ha->request_ptr++;
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}
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qla4xxx_advance_req_ring_ptr(ha);
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/* Load packet defaults */
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cont_entry->hdr.entryType = ET_CONTINUE;
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@ -197,13 +206,10 @@ int qla4xxx_send_command_to_isp(struct scsi_qla_host *ha, struct srb * srb)
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struct scsi_cmnd *cmd = srb->cmd;
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struct ddb_entry *ddb_entry;
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struct command_t3_entry *cmd_entry;
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int nseg;
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uint16_t tot_dsds;
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uint16_t req_cnt;
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unsigned long flags;
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uint16_t cnt;
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uint32_t index;
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char tag[2];
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@ -217,6 +223,19 @@ int qla4xxx_send_command_to_isp(struct scsi_qla_host *ha, struct srb * srb)
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index = (uint32_t)cmd->request->tag;
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/*
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* Check to see if adapter is online before placing request on
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* request queue. If a reset occurs and a request is in the queue,
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* the firmware will still attempt to process the request, retrieving
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* garbage for pointers.
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*/
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if (!test_bit(AF_ONLINE, &ha->flags)) {
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DEBUG2(printk("scsi%ld: %s: Adapter OFFLINE! "
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"Do not issue command.\n",
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ha->host_no, __func__));
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goto queuing_error;
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}
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/* Calculate the number of request entries needed. */
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nseg = scsi_dma_map(cmd);
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if (nseg < 0)
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@ -224,17 +243,7 @@ int qla4xxx_send_command_to_isp(struct scsi_qla_host *ha, struct srb * srb)
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tot_dsds = nseg;
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req_cnt = qla4xxx_calc_request_entries(tot_dsds);
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if (ha->req_q_count < (req_cnt + 2)) {
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cnt = (uint16_t) le32_to_cpu(ha->shadow_regs->req_q_out);
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if (ha->request_in < cnt)
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ha->req_q_count = cnt - ha->request_in;
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else
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ha->req_q_count = REQUEST_QUEUE_DEPTH -
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(ha->request_in - cnt);
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}
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if (ha->req_q_count < (req_cnt + 2))
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if (!qla4xxx_space_in_req_ring(ha, req_cnt))
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goto queuing_error;
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/* total iocbs active */
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@ -286,32 +295,10 @@ int qla4xxx_send_command_to_isp(struct scsi_qla_host *ha, struct srb * srb)
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break;
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}
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/* Advance request queue pointer */
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ha->request_in++;
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if (ha->request_in == REQUEST_QUEUE_DEPTH) {
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ha->request_in = 0;
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ha->request_ptr = ha->request_ring;
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} else
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ha->request_ptr++;
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qla4xxx_advance_req_ring_ptr(ha);
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qla4xxx_build_scsi_iocbs(srb, cmd_entry, tot_dsds);
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wmb();
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/*
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* Check to see if adapter is online before placing request on
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* request queue. If a reset occurs and a request is in the queue,
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* the firmware will still attempt to process the request, retrieving
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* garbage for pointers.
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*/
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if (!test_bit(AF_ONLINE, &ha->flags)) {
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DEBUG2(printk("scsi%ld: %s: Adapter OFFLINE! "
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"Do not issue command.\n",
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ha->host_no, __func__));
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goto queuing_error;
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}
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srb->cmd->host_scribble = (unsigned char *)srb;
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/* update counters */
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@ -385,16 +385,6 @@ int qla4xxx_get_firmware_status(struct scsi_qla_host * ha)
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mbox_sts[0]));
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return QLA_ERROR;
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}
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/* High-water mark of IOCBs */
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ha->iocb_hiwat = mbox_sts[2];
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if (ha->iocb_hiwat > IOCB_HIWAT_CUSHION)
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ha->iocb_hiwat -= IOCB_HIWAT_CUSHION;
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else
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dev_info(&ha->pdev->dev, "WARNING!!! You have less than %d "
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"firmware IOCBs available (%d).\n",
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IOCB_HIWAT_CUSHION, ha->iocb_hiwat);
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return QLA_SUCCESS;
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}
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