linux-kernel - Re: [PATCH rdma-next v2 05/13] RDMA/counter: Add an is_disabled field in struct rdma_hw

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Date:   Mon, 4 Oct 2021 15:00:20 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     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>,
        Mark Zhang <markzhang@...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 v2 05/13] RDMA/counter: Add an is_disabled
 field in struct rdma_hw_stats

On Thu, Sep 30, 2021 at 11:02:21AM +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;
>  
> -	for (i = 0; i < st->num_counters; i++)
> +	mutex_lock(&st->lock);
> +	for (i = 0; i < st->num_counters; i++) {
> +		if (test_bit(i, st->is_disabled))
> +			continue;
>  		if (rdma_nl_stat_hwcounter_entry(msg, st->descs[i].name,
>  						 st->value[i]))
>  			goto err;
> +	}
> +	mutex_unlock(&st->lock);
>  
>  	nla_nest_end(msg, table_attr);
>  	return 0;
>  
>  err:
> +	mutex_unlock(&st->lock);
>  	nla_nest_cancel(msg, table_attr);
>  	return -EMSGSIZE;
>  }
> @@ -2104,6 +2110,9 @@ static int stat_get_doit_default_counter(struct sk_buff *skb,
>  		goto err_stats;
>  	}
>  	for (i = 0; i < num_cnts; i++) {
> +		if (test_bit(i, stats->is_disabled))
> +			continue;
> +
>  		v = stats->value[i] +
>  			rdma_counter_get_hwstat_value(device, port, i);
>  		if (rdma_nl_stat_hwcounter_entry(msg,
> diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
> index 71ece4b00234..890593d5100d 100644
> +++ b/drivers/infiniband/core/verbs.c
> @@ -2987,16 +2987,28 @@ 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);

is_disabled is an unsigned long, not a long

This should just be sizeof(*stats->is_disabled)

Jason