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From: Gal Pressman <galpress@amazon.com>
To: Leon Romanovsky <leon@kernel.org>
Cc: Jason Gunthorpe <jgg@nvidia.com>,
	Doug Ledford <dledford@redhat.com>,
	Yossi Leybovich <sleybo@amazon.com>, <linux-rdma@vger.kernel.org>,
	Alexander Matushevsky <matua@amazon.com>,
	Jason Gunthorpe <jgg@ziepe.ca>, Peter Xu <peterx@redhat.com>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH for-next v2] RDMA/nldev: Add copy-on-fork attribute to get sys command
Date: Thu, 8 Apr 2021 09:30:11 +0300
Message-ID: <21317d2c-9a8e-0dd7-3678-d2933c5053c4@amazon.com> (raw)
In-Reply-To: <YG22Rm1jcYcKWXdT@unreal>

On 07/04/2021 16:40, Leon Romanovsky wrote:
> On Wed, Apr 07, 2021 at 04:30:50PM +0300, Gal Pressman wrote:
>> On 07/04/2021 16:23, Leon Romanovsky wrote:
>>> On Wed, Apr 07, 2021 at 04:14:46PM +0300, Gal Pressman wrote:
>>>> On 07/04/2021 15:39, Leon Romanovsky wrote:
>>>>>> @@ -1710,7 +1721,8 @@ static int nldev_set_sys_set_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
>>>>>>
>>>>>>       err = nlmsg_parse(nlh, 0, tb, RDMA_NLDEV_ATTR_MAX - 1,
>>>>>>                         nldev_policy, extack);
>>>>>> -     if (err || !tb[RDMA_NLDEV_SYS_ATTR_NETNS_MODE])
>>>>>> +     if (err || !tb[RDMA_NLDEV_SYS_ATTR_NETNS_MODE] ||
>>>>>> +         tb[RDMA_NLDEV_SYS_ATTR_COPY_ON_FORK])
>>>>>
>>>>> Why do we fail if user supplies RDMA_NLDEV_SYS_ATTR_COPY_ON_FORK?
>>>>
>>>> It's a read-only attribute, if someone tries to set its value I assume it's best
>>>> to return an error.
>>>
>>> Not in netlink world, you need to ignore the parameters that
>>> you don't "know how to handle" and check for must-to-be input only.
>>
>> Not sure I understand.
>> So you expect the set function to remain unchanged in this patch? Isn't it bad
>> that a user can request to change the copy on fork value and get a success
>> return value although nothing happened?
> 
> The same goes for all netlink attributes, user can send some *_RES_*
> attribute to _set_ and we won't fail. The same goes for rtnetlink too.

Thanks, will remove the check in nldev_set_sys_set_doit().

      reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-07 10:16 Gal Pressman
2021-04-07 12:39 ` Leon Romanovsky
2021-04-07 13:14   ` Gal Pressman
2021-04-07 13:23     ` Leon Romanovsky
2021-04-07 13:30       ` Gal Pressman
2021-04-07 13:40         ` Leon Romanovsky
2021-04-08  6:30           ` Gal Pressman [this message]

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