diff options
| -rw-r--r-- | drivers/scsi/lpfc/lpfc.h | 1 | ||||
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_attr.c | 12 | ||||
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_hw4.h | 4 | ||||
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_sli.c | 6 |
4 files changed, 22 insertions, 1 deletions
diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h index d9f21fbc409..26bcbfb2a18 100644 --- a/drivers/scsi/lpfc/lpfc.h +++ b/drivers/scsi/lpfc/lpfc.h @@ -684,6 +684,7 @@ struct lpfc_hba { #define LPFC_FCF_FOV 1 /* Fast fcf failover */ #define LPFC_FCF_PRIORITY 2 /* Priority fcf failover */ uint32_t cfg_fcf_failover_policy; + uint32_t cfg_fcp_io_sched; uint32_t cfg_cr_delay; uint32_t cfg_cr_count; uint32_t cfg_multi_ring_support; diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c index f7c5531d984..2ab2b9f2bff 100644 --- a/drivers/scsi/lpfc/lpfc_attr.c +++ b/drivers/scsi/lpfc/lpfc_attr.c @@ -3778,6 +3778,16 @@ static DEVICE_ATTR(lpfc_max_scsicmpl_time, S_IRUGO | S_IWUSR, LPFC_ATTR_R(ack0, 0, 0, 1, "Enable ACK0 support"); /* +# lpfc_fcp_io_sched: Determine scheduling algrithmn for issuing FCP cmds +# range is [0,1]. Default value is 0. +# For [0], FCP commands are issued to Work Queues ina round robin fashion. +# For [1], FCP commands are issued to a Work Queue associated with the +# current CPU. +*/ +LPFC_ATTR_RW(fcp_io_sched, 0, 0, 1, "Determine scheduling algrithmn for " + "issuing commands [0] - Round Robin, [1] - Current CPU"); + +/* # lpfc_cr_delay & lpfc_cr_count: Default values for I/O colaesing # cr_delay (msec) or cr_count outstanding commands. cr_delay can take # value [0,63]. cr_count can take value [1,255]. Default value of cr_delay @@ -4001,6 +4011,7 @@ struct device_attribute *lpfc_hba_attrs[] = { &dev_attr_lpfc_topology, &dev_attr_lpfc_scan_down, &dev_attr_lpfc_link_speed, + &dev_attr_lpfc_fcp_io_sched, &dev_attr_lpfc_cr_delay, &dev_attr_lpfc_cr_count, &dev_attr_lpfc_multi_ring_support, @@ -4990,6 +5001,7 @@ struct fc_function_template lpfc_vport_transport_functions = { void lpfc_get_cfgparam(struct lpfc_hba *phba) { + lpfc_fcp_io_sched_init(phba, lpfc_fcp_io_sched); 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); diff --git a/drivers/scsi/lpfc/lpfc_hw4.h b/drivers/scsi/lpfc/lpfc_hw4.h index 821262d2cf7..45fbfb623ad 100644 --- a/drivers/scsi/lpfc/lpfc_hw4.h +++ b/drivers/scsi/lpfc/lpfc_hw4.h @@ -187,6 +187,10 @@ struct lpfc_sli_intf { /* Active interrupt test count */ #define LPFC_ACT_INTR_CNT 4 +/* Algrithmns for scheduling FCP commands to WQs */ +#define LPFC_FCP_SCHED_ROUND_ROBIN 0 +#define LPFC_FCP_SCHED_BY_CPU 1 + /* Delay Multiplier constant */ #define LPFC_DMULT_CONST 651042 diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c index 0d5dab3da96..d8dbe403c37 100644 --- a/drivers/scsi/lpfc/lpfc_sli.c +++ b/drivers/scsi/lpfc/lpfc_sli.c @@ -7816,7 +7816,11 @@ lpfc_sli4_scmd_to_wqidx_distr(struct lpfc_hba *phba) { int i; - i = atomic_add_return(1, &phba->fcp_qidx); + if (phba->cfg_fcp_io_sched == LPFC_FCP_SCHED_BY_CPU) + i = smp_processor_id(); + else + i = atomic_add_return(1, &phba->fcp_qidx); + i = (i % phba->cfg_fcp_io_channel); return i; } |