Re: [PATCH v1 1/6] staging: qlge: Initialize devlink health dump framework for the dlge driver

From: Coiby Xu <coiby.xu@gmail.com>
To: Benjamin Poirier <benjamin.poirier@gmail.com>
Cc: devel@driverdev.osuosl.org,
	"supporter:QLOGIC QLGE 10Gb ETHERNET DRIVER"
	<GR-Linux-NIC-Dev@marvell.com>,
	Manish Chopra <manishc@marvell.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Shung-Hsi Yu <shung-hsi.yu@suse.com>,
	open list <linux-kernel@vger.kernel.org>,
	"open list:QLOGIC QLGE 10Gb ETHERNET DRIVER"
	<netdev@vger.kernel.org>
Subject: Re: [PATCH v1 1/6] staging: qlge: Initialize devlink health dump framework for the dlge driver
Date: Sat, 10 Oct 2020 18:24:16 +0800	[thread overview]
Message-ID: <20201010102416.hvbgx3mgyadmu6ui@Rk> (raw)
In-Reply-To: <20201010073514.GA14495@f3>

On Sat, Oct 10, 2020 at 04:35:14PM +0900, Benjamin Poirier wrote:
>On 2020-10-08 19:58 +0800, Coiby Xu wrote:
>> Initialize devlink health dump framework for the dlge driver so the
>> coredump could be done via devlink.
>>
>> Signed-off-by: Coiby Xu <coiby.xu@gmail.com>
>> ---
>>  drivers/staging/qlge/Kconfig        |  1 +
>>  drivers/staging/qlge/Makefile       |  2 +-
>>  drivers/staging/qlge/qlge.h         |  9 +++++++
>>  drivers/staging/qlge/qlge_devlink.c | 38 +++++++++++++++++++++++++++++
>>  drivers/staging/qlge/qlge_devlink.h |  8 ++++++
>>  drivers/staging/qlge/qlge_main.c    | 28 +++++++++++++++++++++
>>  6 files changed, 85 insertions(+), 1 deletion(-)
>>  create mode 100644 drivers/staging/qlge/qlge_devlink.c
>>  create mode 100644 drivers/staging/qlge/qlge_devlink.h
>>
>> diff --git a/drivers/staging/qlge/Kconfig b/drivers/staging/qlge/Kconfig
>> index a3cb25a3ab80..6d831ed67965 100644
>> --- a/drivers/staging/qlge/Kconfig
>> +++ b/drivers/staging/qlge/Kconfig
>> @@ -3,6 +3,7 @@
>>  config QLGE
>>  	tristate "QLogic QLGE 10Gb Ethernet Driver Support"
>>  	depends on ETHERNET && PCI
>> +	select NET_DEVLINK
>>  	help
>>  	This driver supports QLogic ISP8XXX 10Gb Ethernet cards.
>>
>> diff --git a/drivers/staging/qlge/Makefile b/drivers/staging/qlge/Makefile
>> index 1dc2568e820c..07c1898a512e 100644
>> --- a/drivers/staging/qlge/Makefile
>> +++ b/drivers/staging/qlge/Makefile
>> @@ -5,4 +5,4 @@
>>
>>  obj-$(CONFIG_QLGE) += qlge.o
>>
>> -qlge-objs := qlge_main.o qlge_dbg.o qlge_mpi.o qlge_ethtool.o
>> +qlge-objs := qlge_main.o qlge_dbg.o qlge_mpi.o qlge_ethtool.o qlge_devlink.o
>> diff --git a/drivers/staging/qlge/qlge.h b/drivers/staging/qlge/qlge.h
>> index b295990e361b..290e754450c5 100644
>> --- a/drivers/staging/qlge/qlge.h
>> +++ b/drivers/staging/qlge/qlge.h
>> @@ -2060,6 +2060,14 @@ struct nic_operations {
>>  	int (*port_initialize)(struct ql_adapter *qdev);
>>  };
>>
>> +
>> +
>> +struct qlge_devlink {
>> +        struct ql_adapter *qdev;
>> +        struct net_device *ndev;
>
>This member should be removed, it is unused throughout the rest of the
>series. Indeed, it's simple to use qdev->ndev and that's what
>qlge_reporter_coredump() does.

It reminds me that I forgot to reply to one of your comments in RFC and
sorry for that,
>> +
>> +
>> +struct qlge_devlink {
>> +        struct ql_adapter *qdev;
>> +        struct net_device *ndev;
>
>I don't have experience implementing devlink callbacks but looking at
>some other devlink users (mlx4, ionic, ice), all of them use devlink
>priv space for their main private structure. That would be struct
>ql_adapter in this case. Is there a good reason to stray from that
>pattern?

struct ql_adapter which is created via alloc_etherdev_mq is the
private space of struct net_device so we can't use ql_adapter as the
the devlink private space simultaneously. Thus struct qlge_devlink is
required.

--
Best regards,
Coiby
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