[SCSI] lpfc 8.3.32: Fix ability to change FCP EQ delay multiplier

Fix fcp_imax module parameter to dynamically change FCP EQ delay multiplier

Signed-off-by: Alex Iannicelli <alex.iannicelli@emulex.com>
Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 77 insertions, 0 deletions

diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 3333e64703a3..9cbd20b1328b 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -12048,6 +12048,83 @@ out_fail:
 }
 
 /**
+ * lpfc_modify_fcp_eq_delay - Modify Delay Multiplier on FCP EQs
+ * @phba: HBA structure that indicates port to create a queue on.
+ * @startq: The starting FCP EQ to modify
+ *
+ * This function sends an MODIFY_EQ_DELAY mailbox command to the HBA.
+ *
+ * The @phba struct is used to send mailbox command to HBA. The @startq
+ * is used to get the starting FCP EQ to change.
+ * This function is asynchronous and will wait for the mailbox
+ * command to finish before continuing.
+ *
+ * On success this function will return a zero. If unable to allocate enough
+ * memory this function will return -ENOMEM. If the queue create mailbox command
+ * fails this function will return -ENXIO.
+ **/
+uint32_t
+lpfc_modify_fcp_eq_delay(struct lpfc_hba *phba, uint16_t startq)
+{
+        struct lpfc_mbx_modify_eq_delay *eq_delay;
+        LPFC_MBOXQ_t *mbox;
+        struct lpfc_queue *eq;
+        int cnt, rc, length, status = 0;
+        uint32_t shdr_status, shdr_add_status;
+        int fcp_eqidx;
+        union lpfc_sli4_cfg_shdr *shdr;
+        uint16_t dmult;
+
+        if (startq >= phba->cfg_fcp_eq_count)
+                return 0;
+
+        mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
+        if (!mbox)
+                return -ENOMEM;
+        length = (sizeof(struct lpfc_mbx_modify_eq_delay) -
+                  sizeof(struct lpfc_sli4_cfg_mhdr));
+        lpfc_sli4_config(phba, mbox, LPFC_MBOX_SUBSYSTEM_COMMON,
+                         LPFC_MBOX_OPCODE_MODIFY_EQ_DELAY,
+                         length, LPFC_SLI4_MBX_EMBED);
+        eq_delay = &mbox->u.mqe.un.eq_delay;
+
+        /* Calculate delay multiper from maximum interrupt per second */
+        dmult = LPFC_DMULT_CONST/phba->cfg_fcp_imax - 1;
+
+        cnt = 0;
+        for (fcp_eqidx = startq; fcp_eqidx < phba->cfg_fcp_eq_count;
+            fcp_eqidx++) {
+                eq = phba->sli4_hba.fp_eq[fcp_eqidx];
+                if (!eq)
+                        continue;
+                eq_delay->u.request.eq[cnt].eq_id = eq->queue_id;
+                eq_delay->u.request.eq[cnt].phase = 0;
+                eq_delay->u.request.eq[cnt].delay_multi = dmult;
+                cnt++;
+                if (cnt >= LPFC_MAX_EQ_DELAY)
+                        break;
+        }
+        eq_delay->u.request.num_eq = cnt;
+
+        mbox->vport = phba->pport;
+        mbox->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
+        mbox->context1 = NULL;
+        rc = lpfc_sli_issue_mbox(phba, mbox, MBX_POLL);
+        shdr = (union lpfc_sli4_cfg_shdr *) &eq_delay->header.cfg_shdr;
+        shdr_status = bf_get(lpfc_mbox_hdr_status, &shdr->response);
+        shdr_add_status = bf_get(lpfc_mbox_hdr_add_status, &shdr->response);
+        if (shdr_status || shdr_add_status || rc) {
+                lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
+                                "2512 MODIFY_EQ_DELAY mailbox failed with "
+                                "status x%x add_status x%x, mbx status x%x\n",
+                                shdr_status, shdr_add_status, rc);
+                status = -ENXIO;
+        }
+        mempool_free(mbox, phba->mbox_mem_pool);
+        return status;
+}
+
+/**
  * lpfc_eq_create - Create an Event Queue on the HBA
  * @phba: HBA structure that indicates port to create a queue on.
  * @eq: The queue structure to use to create the event queue.