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

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Date: Tue, 16 Apr 2024 06:27:04 +0200
From: Zhu Yanjun <yanjun.zhu@...ux.dev>
To: Jason Gunthorpe <jgg@...pe.ca>,
 Shradha Gupta <shradhagupta@...ux.microsoft.com>
Cc: linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org,
 linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Ajay Sharma <sharmaajay@...rosoft.com>,
 Leon Romanovsky <leon@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 "K. Y. Srinivasan" <kys@...rosoft.com>,
 Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>,
 Dexuan Cui <decui@...rosoft.com>, Long Li <longli@...rosoft.com>,
 Michael Kelley <mikelley@...rosoft.com>,
 Shradha Gupta <shradhagupta@...rosoft.com>, Yury Norov
 <yury.norov@...il.com>, Konstantin Taranov <kotaranov@...rosoft.com>,
 Souradeep Chakrabarti <schakrabarti@...ux.microsoft.com>
Subject: Re: [PATCH net-next] net: mana: Add new device attributes for mana

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@...ux.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;
>> +
> 
> 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