netdev - Re: [PATCH rdma-next v1 04/11] RDMA/counter: Add an is_disabled field in struct rdma_hw

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Date:   Tue, 28 Sep 2021 11:28:39 +0800
From:   Mark Zhang <markzhang@...dia.com>
To:     Jason Gunthorpe <jgg@...dia.com>, Leon Romanovsky <leon@...nel.org>
CC:     Doug Ledford <dledford@...hat.com>,
        Aharon Landau <aharonl@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        Gal Pressman <galpress@...zon.com>,
        Jakub Kicinski <kuba@...nel.org>,
        <linux-kernel@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
        Maor Gottlieb <maorg@...dia.com>,
        Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>,
        Mustafa Ismail <mustafa.ismail@...el.com>,
        Naresh Kumar PBS <nareshkumar.pbs@...adcom.com>,
        <netdev@...r.kernel.org>, Potnuri Bharat Teja <bharat@...lsio.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Selvin Xavier <selvin.xavier@...adcom.com>,
        Shiraz Saleem <shiraz.saleem@...el.com>,
        "Yishai Hadas" <yishaih@...dia.com>,
        Zhu Yanjun <zyjzyj2000@...il.com>
Subject: Re: [PATCH rdma-next v1 04/11] RDMA/counter: Add an is_disabled field
 in struct rdma_hw_stats

On 9/28/2021 12:53 AM, Jason Gunthorpe wrote:
> On Wed, Sep 15, 2021 at 02:07:23AM +0300, Leon Romanovsky wrote:
> 
>> diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
>> index 3f6b98a87566..67519730b1ac 100644
>> +++ b/drivers/infiniband/core/nldev.c
>> @@ -968,15 +968,21 @@ static int fill_stat_counter_hwcounters(struct sk_buff *msg,
>>   	if (!table_attr)
>>   		return -EMSGSIZE;
>> @@ -601,11 +604,20 @@ static inline struct rdma_hw_stats *rdma_alloc_hw_stats_struct(
>>   	if (!stats)
>>   		return NULL;
>>   
>> +	stats->is_disabled = kcalloc(BITS_TO_LONGS(num_counters),
>> +				      sizeof(long), GFP_KERNEL);
>> +	if (!stats->is_disabled)
>> +		goto err;
>> +
> 
> Please de-inline this function and make a rdma_free_hw_stats_struct()
> call to pair with it. The hw_stats_data kfree should be in there. If
> you do this as a precursor patch this patch will be much smaller.
> 
> Also, the
> 
>          stats = kzalloc(sizeof(*stats) + num_counters * sizeof(u64),
>                          GFP_KERNEL);
> 
> Should be using array_size
Maybe use struct_size:
   stats = kzalloc(struct_size(stats, value, num_counters), GFP_KERNEL);