[PATCH] lpfc 8.1.3: Fix performance when using multiple SLI rings

[linux-2.6-omap-h63xx.git] / drivers / scsi / lpfc / lpfc_attr.c

diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
index ab49379b6abec8c8d22360cb2f6b082b6e9edebf..2558156f064df282cb63ddb0722dbd5b4e7d65ae 100644 (file)
--- a/drivers/scsi/lpfc/lpfc_attr.c
+++ b/drivers/scsi/lpfc/lpfc_attr.c
@@ -670,6 +670,14 @@ LPFC_ATTR_RW(cr_delay, 0, 0, 63, "A count of milliseconds after which an "
 LPFC_ATTR_RW(cr_count, 1, 1, 255, "A count of I/O completions after which an "
                "interrupt response is generated");
 
+/*
+# lpfc_multi_ring_support:  Determines how many rings to spread available
+# cmd/rsp IOCB entries across.
+# Value range is [1,2]. Default value is 1.
+*/
+LPFC_ATTR_R(multi_ring_support, 1, 1, 2, "Determines number of primary "
+               "SLI rings to spread IOCB entries across");
+
 /*
 # lpfc_fdmi_on: controls FDMI support.
 #       0 = no FDMI support
@@ -726,6 +734,7 @@ struct class_device_attribute *lpfc_host_attrs[] = {
        &class_device_attr_lpfc_link_speed,
        &class_device_attr_lpfc_cr_delay,
        &class_device_attr_lpfc_cr_count,
+       &class_device_attr_lpfc_multi_ring_support,
        &class_device_attr_lpfc_fdmi_on,
        &class_device_attr_lpfc_max_luns,
        &class_device_attr_nport_evt_cnt,
@@ -1440,6 +1449,7 @@ lpfc_get_cfgparam(struct lpfc_hba *phba)
        lpfc_log_verbose_init(phba, lpfc_log_verbose);
        lpfc_cr_delay_init(phba, lpfc_cr_delay);
        lpfc_cr_count_init(phba, lpfc_cr_count);
+       lpfc_multi_ring_support_init(phba, lpfc_multi_ring_support);
        lpfc_lun_queue_depth_init(phba, lpfc_lun_queue_depth);
        lpfc_fcp_class_init(phba, lpfc_fcp_class);
        lpfc_use_adisc_init(phba, lpfc_use_adisc);