scsi: lpfc: Fix setting affinity hints to correlate with hardware queues

The desired affinity for the hardware queue behavior is for hdwq 0 to be
affinitized with cpu 0, hdwq 1 to cpu 1, and so on.  The implementation so
far does not do this if the number of cpus is greater than the number of
hardware queues (e.g. hardware queue allocation was administratively
reduced or hardware queue resources could not scale to the cpu count).

Correct the queue affinitization logic when queue count is less than
cpu count.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 26 insertions, 32 deletions

diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index 10e3ad5419f0..d9db29817f6b 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -71,7 +71,6 @@ unsigned long _dump_buf_dif_order;
 spinlock_t _dump_buf_lock;
 
 /* Used when mapping IRQ vectors in a driver centric manner */
-uint16_t *lpfc_used_cpu;
 uint32_t lpfc_present_cpu;
 
 static void lpfc_get_hba_model_desc(struct lpfc_hba *, uint8_t *, uint8_t *);
@@ -6841,20 +6840,6 @@ lpfc_sli4_driver_resource_setup(struct lpfc_hba *phba)
 		rc = -ENOMEM;
 		goto out_free_hba_eq_hdl;
 	}
-	if (lpfc_used_cpu == NULL) {
-		lpfc_used_cpu = kcalloc(lpfc_present_cpu, sizeof(uint16_t),
-						GFP_KERNEL);
-		if (!lpfc_used_cpu) {
-			lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
-					"3335 Failed allocate memory for msi-x "
-					"interrupt vector mapping\n");
-			kfree(phba->sli4_hba.cpu_map);
-			rc = -ENOMEM;
-			goto out_free_hba_eq_hdl;
-		}
-		for (i = 0; i < lpfc_present_cpu; i++)
-			lpfc_used_cpu[i] = LPFC_VECTOR_MAP_EMPTY;
-	}
 
 	/*
 	 * Enable sr-iov virtual functions if supported and configured
@@ -10463,7 +10448,6 @@ lpfc_sli_disable_intr(struct lpfc_hba *phba)
 /**
  * lpfc_cpu_affinity_check - Check vector CPU affinity mappings
  * @phba: pointer to lpfc hba data structure.
- * @vectors: number of msix vectors allocated.
  *
  * The routine will figure out the CPU affinity assignment for every
  * MSI-X vector allocated for the HBA.  The hba_eq_hdl will be updated
@@ -10474,12 +10458,10 @@ lpfc_sli_disable_intr(struct lpfc_hba *phba)
  * and the phba->sli4_hba.cpu_map array will reflect this.
  */
 static void
-lpfc_cpu_affinity_check(struct lpfc_hba *phba, int vectors)
+lpfc_cpu_affinity_check(struct lpfc_hba *phba)
 {
 	struct lpfc_vector_map_info *cpup;
-	int index = 0;
-	int vec = 0;
-	int cpu;
+	int cpu, idx;
 #ifdef CONFIG_X86
 	struct cpuinfo_x86 *cpuinfo;
 #endif
@@ -10501,16 +10483,26 @@ lpfc_cpu_affinity_check(struct lpfc_hba *phba, int vectors)
 		cpup->phys_id = 0;
 		cpup->core_id = 0;
 #endif
-		cpup->channel_id = index;  /* For now round robin */
-		cpup->irq = pci_irq_vector(phba->pcidev, vec);
-		vec++;
-		if (vec >= vectors)
-			vec = 0;
-		index++;
-		if (index >= phba->cfg_hdw_queue)
-			index = 0;
+		lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
+				"3328 CPU physid %d coreid %d\n",
+				cpup->phys_id, cpup->core_id);
 		cpup++;
 	}
+
+	for (idx = 0; idx <  phba->cfg_hdw_queue; idx++) {
+		cpup = &phba->sli4_hba.cpu_map[idx];
+		cpup->irq = pci_irq_vector(phba->pcidev, idx);
+
+		/* For now assume vector N maps to CPU N */
+		irq_set_affinity_hint(cpup->irq, get_cpu_mask(idx));
+		cpup->hdwq = idx;
+
+		lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
+			"3336 Set Affinity: CPU %d "
+			"hdwq %d irq %d\n",
+			cpu, cpup->hdwq, cpup->irq);
+	}
+	return;
 }
 
 
@@ -10576,7 +10568,7 @@ lpfc_sli4_enable_msix(struct lpfc_hba *phba)
 		if (phba->cfg_nvmet_mrq > vectors)
 			phba->cfg_nvmet_mrq = vectors;
 	}
-	lpfc_cpu_affinity_check(phba, vectors);
+	lpfc_cpu_affinity_check(phba);
 
 	return rc;
 
@@ -10724,9 +10716,13 @@ lpfc_sli4_disable_intr(struct lpfc_hba *phba)
 		int index;
 
 		/* Free up MSI-X multi-message vectors */
-		for (index = 0; index < phba->cfg_hdw_queue; index++)
+		for (index = 0; index < phba->cfg_hdw_queue; index++) {
+			irq_set_affinity_hint(
+				pci_irq_vector(phba->pcidev, index),
+				NULL);
 			free_irq(pci_irq_vector(phba->pcidev, index),
 					&phba->sli4_hba.hba_eq_hdl[index]);
+		}
 	} else {
 		free_irq(phba->pcidev->irq, phba);
 	}
@@ -12990,7 +12986,6 @@ lpfc_init(void)
 	lpfc_nvmet_cmd_template();
 
 	/* Initialize in case vector mapping is needed */
-	lpfc_used_cpu = NULL;
 	lpfc_present_cpu = num_present_cpus();
 
 	error = pci_register_driver(&lpfc_driver);
@@ -13029,7 +13024,6 @@ lpfc_exit(void)
 				(1L << _dump_buf_dif_order), _dump_buf_dif);
 		free_pages((unsigned long)_dump_buf_dif, _dump_buf_dif_order);
 	}
-	kfree(lpfc_used_cpu);
 	idr_destroy(&lpfc_hba_index);
 }