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Commit 5f0e385f authored by Joe Eykholt's avatar Joe Eykholt Committed by James Bottomley
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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: default avatarJoe Eykholt <jeykholt@cisco.com>
Signed-off-by: default avatarRobert Love <robert.w.love@intel.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
parent ba9cd5d0

drivers/scsi/libfc/fc_fcp.c

+2 −2
Original line number Diff line number Diff line
@@ -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++;

drivers/scsi/libfc/fc_lport.c

+6 −2
Original line number Diff line number Diff line
@@ -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;

include/scsi/libfc.h

+4 −4
Original line number Diff line number Diff line
@@ -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;

};