netdev - Re: [PATCH net 2/5] ionic: fix up filter locks and debug msgs

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Date:   Mon, 20 Jul 2020 18:05:38 -0700
From:   Shannon Nelson <snelson@...sando.io>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH net 2/5] ionic: fix up filter locks and debug msgs

On 7/20/20 5:03 PM, Jakub Kicinski wrote:
> On Mon, 20 Jul 2020 16:00:14 -0700 Shannon Nelson wrote:
>> Add in a couple of forgotten spinlocks and fix up some of
>> the debug messages around filter management.
> Aren't these independent changes?

They can be... they went together in my head as a cleanup that was done 
before the filter_id patch that follows.

>
>> Fixes: c1e329ebec8d ("ionic: Add management of rx filters")
>> Signed-off-by: Shannon Nelson <snelson@...sando.io>
>> diff --git a/drivers/net/ethernet/pensando/ionic/ionic_rx_filter.c b/drivers/net/ethernet/pensando/ionic/ionic_rx_filter.c
>> index 80eeb7696e01..fb9d828812bd 100644
>> --- a/drivers/net/ethernet/pensando/ionic/ionic_rx_filter.c
>> +++ b/drivers/net/ethernet/pensando/ionic/ionic_rx_filter.c
>> @@ -69,10 +69,12 @@ int ionic_rx_filters_init(struct ionic_lif *lif)
>>   
>>   	spin_lock_init(&lif->rx_filters.lock);
>>   
>> +	spin_lock_bh(&lif->rx_filters.lock);
>>   	for (i = 0; i < IONIC_RX_FILTER_HLISTS; i++) {
>>   		INIT_HLIST_HEAD(&lif->rx_filters.by_hash[i]);
>>   		INIT_HLIST_HEAD(&lif->rx_filters.by_id[i]);
>>   	}
>> +	spin_unlock_bh(&lif->rx_filters.lock);
>>   
>>   	return 0;
>>   }
>> @@ -84,11 +86,13 @@ void ionic_rx_filters_deinit(struct ionic_lif *lif)
>>   	struct hlist_node *tmp;
>>   	unsigned int i;
>>   
>> +	spin_lock_bh(&lif->rx_filters.lock);
>>   	for (i = 0; i < IONIC_RX_FILTER_HLISTS; i++) {
>>   		head = &lif->rx_filters.by_id[i];
>>   		hlist_for_each_entry_safe(f, tmp, head, by_id)
>>   			ionic_rx_filter_free(lif, f);
>>   	}
>> +	spin_unlock_bh(&lif->rx_filters.lock);
>>   }
> Taking a lock around init/deinit is a little strange, is this fixing
> a possible issue or just for "completeness"? If the like head can be
> modified before it's initialized or after its flushed - that's a more
> serious problem to address..

Yes, this is a completeness thing.

sln