RE: [PATCH] storvsc: add more logging for error and warning messages

[Long Li]

Thanks Joe.

I'll send out another patch.

> -----Original Message-----
> From: Joe Perches [mailto:joe@xxxxxxxxxxx]
> Sent: Thursday, December 3, 2015 6:28 PM
> To: Long Li <longli@xxxxxxxxxxxxx>; KY Srinivasan <kys@xxxxxxxxxxxxx>;
> Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>; James E.J. Bottomley
> <JBottomley@xxxxxxxx>
> Cc: devel@xxxxxxxxxxxxxxxxxxxxxx; linux-scsi@xxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH] storvsc: add more logging for error and warning
> messages
> 
> On Thu, 2015-12-03 at 19:47 -0800, Long Li wrote:
> > Introduce a logging level for storvsc to log certain error/warning
> > messages. Those messages are helpful in some environments, e.g.
> > Microsoft Azure, for customer support and troubleshooting purposes.
> []
> > diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
> []
> > +static inline bool do_logging(int level) {
> > +	return (logging_level >= level) ? true : false;
> 
> The ternary is not necessary
> 
> 	return logging_level >= level;
> 
> is enough
> 
> > +}
> > +
> > +
> >  struct vmscsi_win8_extension {
> >  	/*
> >  	 * The following were added in Windows 8 @@ -1183,7 +1198,7 @@
> > static void storvsc_command_completion(struct storvsc_cmd_request
> > *cmd_request)
> >
> >  	scmnd->result = vm_srb->scsi_status;
> >
> > -	if (scmnd->result) {
> > +	if (scmnd->result && do_logging(STORVSC_LOGGING_ERROR)) {
> >  		if (scsi_normalize_sense(scmnd->sense_buffer,
> >  				SCSI_SENSE_BUFFERSIZE, &sense_hdr))
> >  			scsi_print_sense_hdr(scmnd->device, "storvsc",
> 
> Is it appropriate to make this scsi_normalize_sense call conditional on
> do_logging here?
> 
> > @@ -1239,12 +1254,25 @@ static void storvsc_on_io_completion(struct
> hv_device *device,
> >  	stor_pkt->vm_srb.sense_info_length =
> >  	vstor_packet->vm_srb.sense_info_length;
> >
> > +	if (vstor_packet->vm_srb.scsi_status != 0 ||
> > +		vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS)
> > +		if (do_logging(STORVSC_LOGGING_WARN))
> > +			dev_warn(&device->device,
> > +				"cmd 0x%x scsi status 0x%x srb status
> 0x%x\n",
> > +				stor_pkt->vm_srb.cdb[0],
> > +				vstor_packet->vm_srb.scsi_status,
> > +				vstor_packet->vm_srb.srb_status);
> 
> It might make some sense to use another macro indirection like
> 
> #define svc_log_warn(dev, level, fmt, ...)			\
> do {								\
> 	if (do_logging(STORSVC_LOGGING_##level)			\
> 		dev_warn(&(dev)->device, fmt, ##__VA_ARGS__);	\
> } while (0)
> 
> So a use could be:
> 
> 	if (vstore_packet...)
> 		svc_log_warn(device, WARN, ...);
> 
> >
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