netdev - Re: [net-next PATCH v1 2/7] net: addr_list: add exclusive dev_uc_add and dev_mc

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Date:	Wed, 11 Apr 2012 07:46:07 -0700
From:	John Fastabend <john.r.fastabend@...el.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	mst@...hat.com, stephen.hemminger@...tta.com, davem@...emloft.net,
	hadi@...erus.ca, jeffrey.t.kirsher@...el.com,
	netdev@...r.kernel.org, gregory.v.rose@...el.com,
	krkumar2@...ibm.com, sri@...ibm.com
Subject: Re: [net-next PATCH v1 2/7] net: addr_list: add exclusive dev_uc_add
 and dev_mc_add

On 4/10/2012 8:33 PM, Ben Hutchings wrote:
> On Mon, 2012-04-09 at 15:00 -0700, John Fastabend wrote:
>> This adds a dev_uc_add_excl() and dev_mc_add_excl() calls
>> similar to the original dev_{uc|mc}_add() except it sets
>> the global bit and returns -EEXIST for duplicat entires.
>>
>> This is useful for drivers that support SR-IOV, macvlan
>> devices and any other devices that need to manage the
>> unicast and multicast lists.
> [...]
>> +/**
>> + *	dev_mc_add_excl - Add a global secondary multicast address
>> + *	@dev: device
>> + *	@addr: address to add
>> + */
>> +int dev_mc_add_excl(struct net_device *dev, unsigned char *addr)
>> +{
>> +	struct netdev_hw_addr *ha;
>> +	int err;
>> +
>> +	netif_addr_lock_bh(dev);
>> +	list_for_each_entry(ha, &dev->mc.list, list) {
>> +		if (!memcmp(ha->addr, addr, dev->addr_len) &&
>> +		    ha->type == NETDEV_HW_ADDR_T_UNICAST) {
>> +			err = -EEXIST;
>> +			goto out;
>> +		}
>> +	}
>> +	err = __hw_addr_create_ex(&dev->mc, addr, dev->addr_len,
>> +				  NETDEV_HW_ADDR_T_UNICAST, true);
> [...]
> 
> The address types are wrong.  But do we even need this function yet?
> 
> Ben.
> 

macvlan wants to manage multicast addresses as well. Good catch thanks.

.John
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