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[SCSI] libfc: fix statistics for FCP input/output megabytes 

The statistics for InputMegabytes and OutputMegabytes are
misnamed.  They're accumulating bytes, not megabytes.

The statistic returned via /sys must be in megabytes, however,
which is what the HBA-API wants.  The FCP code needs to accumulate
it in bytes and then divide by 1,000,000 (not 2^20) before it
presented via sysfs.

This affects fcoe.ko only, not fnic.  The fnic driver
correctly by accumulating bytes and then converts to megabytes.

I checked that libhbalinux is using the /sys file directly without
conversion.

BTW, qla2xxx does divide by 2^20, which I'm not fixing here.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Joe Eykholt 2010-11-30 16:20:18 -08:00 committed by James Bottomley
parent ba9cd5d095
commit 5f0e385fda
3 changed files with 12 additions and 8 deletions
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4
drivers/scsi/libfc/fc_fcp.c
View File

@ -1860,11 +1860,11 @@ static int fc_queuecommand_lck(struct scsi_cmnd *sc_cmd, void (*done)(struct scs
if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
fsp->req_flags = FC_SRB_READ;
stats->InputRequests++;
stats->InputMegabytes += fsp->data_len;
stats->InputBytes += fsp->data_len;
} else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
fsp->req_flags = FC_SRB_WRITE;
stats->OutputRequests++;
stats->OutputMegabytes += fsp->data_len;
stats->OutputBytes += fsp->data_len;
} else {
fsp->req_flags = 0;
stats->ControlRequests++;

8
drivers/scsi/libfc/fc_lport.c
View File

@ -288,6 +288,8 @@ struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost)
struct fc_lport *lport = shost_priv(shost);
struct timespec v0, v1;
unsigned int cpu;
u64 fcp_in_bytes = 0;
u64 fcp_out_bytes = 0;
fcoe_stats = &lport->host_stats;
memset(fcoe_stats, 0, sizeof(struct fc_host_statistics));
@ -310,10 +312,12 @@ struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost)
fcoe_stats->fcp_input_requests += stats->InputRequests;
fcoe_stats->fcp_output_requests += stats->OutputRequests;
fcoe_stats->fcp_control_requests += stats->ControlRequests;
fcoe_stats->fcp_input_megabytes += stats->InputMegabytes;
fcoe_stats->fcp_output_megabytes += stats->OutputMegabytes;
fcp_in_bytes += stats->InputBytes;
fcp_out_bytes += stats->OutputBytes;
fcoe_stats->link_failure_count += stats->LinkFailureCount;
}
fcoe_stats->fcp_input_megabytes = div_u64(fcp_in_bytes, 1000000);
fcoe_stats->fcp_output_megabytes = div_u64(fcp_out_bytes, 1000000);
fcoe_stats->lip_count = -1;
fcoe_stats->nos_count = -1;
fcoe_stats->loss_of_sync_count = -1;

8
include/scsi/libfc.h
View File

@ -221,8 +221,8 @@ struct fc_rport_priv {
* @InputRequests: Number of input requests
* @OutputRequests: Number of output requests
* @ControlRequests: Number of control requests
* @InputMegabytes: Number of received megabytes
* @OutputMegabytes: Number of transmitted megabytes
* @InputBytes: Number of received bytes
* @OutputBytes: Number of transmitted bytes
* @VLinkFailureCount: Number of virtual link failures
* @MissDiscAdvCount: Number of missing FIP discovery advertisement
*/
@ -241,8 +241,8 @@ struct fcoe_dev_stats {
u64 InputRequests;
u64 OutputRequests;
u64 ControlRequests;
u64 InputMegabytes;
u64 OutputMegabytes;
u64 InputBytes;
u64 OutputBytes;
u64 VLinkFailureCount;
u64 MissDiscAdvCount;
};