Re: [PATCH net-next] net: mana: Add new device attributes for mana

[Zhu Yanjun]

在 2024/4/15 18:13, Jason Gunthorpe 写道:
> On Mon, Apr 15, 2024 at 02:49:49AM -0700, Shradha Gupta wrote:
> > Add new device attributes to view multiport, msix, and adapter MTU
> > setting for MANA device.
> >
> > Signed-off-by: Shradha Gupta <shradhagupta@xxxxxxxxxxxxxxxxxxx>
> > ---
> >   .../net/ethernet/microsoft/mana/gdma_main.c   | 74 +++++++++++++++++++
> >   include/net/mana/gdma.h                       |  9 +++
> >   2 files changed, 83 insertions(+)
> >
> > diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
> > index 1332db9a08eb..6674a02cff06 100644
> > --- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
> > +++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
> > @@ -1471,6 +1471,65 @@ static bool mana_is_pf(unsigned short dev_id)
> >   	return dev_id == MANA_PF_DEVICE_ID;
> >   }
> >   
> > +static ssize_t mana_attr_show(struct device *dev,
> > +			      struct device_attribute *attr, char *buf)
> > +{
> > +	struct pci_dev *pdev = to_pci_dev(dev);
> > +	struct gdma_context *gc = pci_get_drvdata(pdev);
> > +	struct mana_context *ac = gc->mana.driver_data;
> > +
> > +	if (strcmp(attr->attr.name, "mport") == 0)
> > +		return snprintf(buf, PAGE_SIZE, "%d\n", ac->num_ports);
> > +	else if (strcmp(attr->attr.name, "adapter_mtu") == 0)
> > +		return snprintf(buf, PAGE_SIZE, "%d\n", gc->adapter_mtu);
> > +	else if (strcmp(attr->attr.name, "msix") == 0)
> > +		return snprintf(buf, PAGE_SIZE, "%d\n", gc->max_num_msix);
> > +	else
> > +		return -EINVAL;
> > +
>
> That is not how sysfs should be implemented at all, please find a
> good example to copy from. Every attribute should use its own function
> with the macros to link it into an attributes group and sysfs_emit
> should be used for printing

Not sure if this file drivers/infiniband/hw/usnic/usnic_ib_sysfs.c is a 
good example or not.

Zhu Yanjun

> Jason