linux-kernel - Re: [PATCH 8/8] scsi: qla2xxx: Use FIELD

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Date:   Tue, 12 Sep 2023 11:39:46 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
CC:     <linux-pci@...r.kernel.org>, Bjorn Helgaas <helgaas@...nel.org>,
        "Nilesh Javali" <njavali@...vell.com>,
        <GR-QLogic-Storage-Upstream@...vell.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 8/8] scsi: qla2xxx: Use FIELD_GET() to extract Link
 Width

On Mon, 11 Sep 2023 15:15:01 +0300
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com> wrote:

> Use FIELD_GET() to extract PCIe Maximum Link Width field instead of
> custom masking and shifting.
> 
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> ---
>  drivers/scsi/qla2xxx/qla_os.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
> index 877e4f446709..0c97a5e4249c 100644
> --- a/drivers/scsi/qla2xxx/qla_os.c
> +++ b/drivers/scsi/qla2xxx/qla_os.c
> @@ -5,6 +5,7 @@
>   */
>  #include "qla_def.h"
>  
> +#include <linux/bitfield.h>
>  #include <linux/moduleparam.h>
>  #include <linux/vmalloc.h>
>  #include <linux/delay.h>
> @@ -632,7 +633,7 @@ qla24xx_pci_info_str(struct scsi_qla_host *vha, char *str, size_t str_len)
>  
>  		pcie_capability_read_dword(ha->pdev, PCI_EXP_LNKCAP, &lstat);
>  		lspeed = lstat & PCI_EXP_LNKCAP_SLS;
> -		lwidth = (lstat & PCI_EXP_LNKCAP_MLW) >> 4;
> +		lwidth = FIELD_GET(PCI_EXP_LNKCAP_MLW, lstat);

As previous.  Whilst I'm happy to see this change I'd prefer to see it
used in all similar cases so do the lspeed one just above as well.

As a reviewer I don't want to care about the alignment of a particular
field and hence whether it needs shifting or just masking.
I want to review the header once to see it matches the spec, then never
look at it again!

Jonathan

>  
>  		switch (lspeed) {
>  		case 1: