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Date: Mon, 15 Apr 2024 21:26:28 -0700
From: Shradha Gupta <shradhagupta@linux.microsoft.com>
To: Saurabh Singh Sengar <ssengar@linux.microsoft.com>
Cc: linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org,
	linux-rdma@vger.kernel.org, netdev@vger.kernel.org,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Ajay Sharma <sharmaajay@microsoft.com>,
	Leon Romanovsky <leon@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	"K. Y. Srinivasan" <kys@microsoft.com>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
	Long Li <longli@microsoft.com>,
	Michael Kelley <mikelley@microsoft.com>,
	Shradha Gupta <shradhagupta@microsoft.com>,
	Yury Norov <yury.norov@gmail.com>,
	Konstantin Taranov <kotaranov@microsoft.com>,
	Souradeep Chakrabarti <schakrabarti@linux.microsoft.com>
Subject: Re: [PATCH net-next] net: mana: Add new device attributes for mana
Message-ID: <20240416042628.GB23796@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
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 <20240415163832.GA28558@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
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On Mon, Apr 15, 2024 at 09:38:32AM -0700, Saurabh Singh Sengar wrote:
> 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@linux.microsoft.com>
> > ---
> >  .../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;
> > +}
> > +
> > +static int mana_gd_setup_sysfs(struct pci_dev *pdev)
> > +{
> > +	struct gdma_context *gc = pci_get_drvdata(pdev);
> > +	int retval = 0;
> > +
> > +	gc->mana_attributes.mana_mport_attr.attr.name = "mport";
> > +	gc->mana_attributes.mana_mport_attr.attr.mode = 0444;
> > +	gc->mana_attributes.mana_mport_attr.show = mana_attr_show;
> > +	sysfs_attr_init(&gc->mana_attributes.mana_mport_attr);
> > +	retval = device_create_file(&pdev->dev,
> > +				    &gc->mana_attributes.mana_mport_attr);
> 
> if you can use .dev_groups, sysfs creation and removal will be lot more
> simplified for the driver.
Sure Saurabh, I think we can do this too.
> 
> - Saurabh