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Date: Thu, 29 Mar 2012 14:26:15 -0700
From: Roopa Prabhu <roprabhu@...co.com>
To: John Fastabend <john.r.fastabend@...el.com>,
"Michael S. Tsirkin" <mst@...hat.com>
CC: <netdev@...r.kernel.org>
Subject: Re: [RFC PATCH] macvlan: add FDB bridge ops
On 3/28/12 8:58 AM, "John Fastabend" <john.r.fastabend@...el.com> wrote:
> On 3/28/2012 8:52 AM, Michael S. Tsirkin wrote:
>> On Wed, Mar 28, 2012 at 08:43:56AM -0700, Roopa Prabhu wrote:
>>> On 3/20/12 5:26 PM, "John Fastabend" <john.r.fastabend@...el.com> wrote:
>>>
>>>> Add support to add/del and dump the forwarding database
>>>> for macvlan passthru mode. The macvlan driver acts like
>>>> a Two Port Mac Relay (TPMR 802.1Q-2011) in the passthru
>>>> case so adding forwarding rules is just adding the addr
>>>> to the uc or mc lists.
>>>>
>>>> By default the passthru mode puts the lowerdev into a
>>>> promiscuous mode to receive all packets. This behavior
>>>> is not changed by this patch. This is a bit problematic
>>>> and needs to be solved without IMHO breaking existing
>>>> mechanics. Maybe on the first add_fdb we can decrement
>>>> the promisc mode? That seems to work reasonable well and
>>>> keep existing functionality in place... but requires
>>>> an initial add to set things up which is a bit annoying
>>>> so maybe a flag is better. I haven't thought too hard
>>>> about it yet so any ideas welcome
>>
>>
>> ...
>>
>>> Thanks John. Looks good.
>>> I added a few things to your patch below. Yes, I think the promisc check is
>>> required. Made an attempt to add a flag below (I did not get a chance to
>>> think about other approaches there too). Briefly tested it with the br
>>> command.
>>>
>>>
>>> diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
>>> index f975afd..9bc70ad 100644
>>> --- a/drivers/net/macvlan.c
>>> +++ b/drivers/net/macvlan.c
>>> @@ -34,6 +34,9 @@
>>>
>>> #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
>>>
>>> +/* macvlan port flags */
>>> +#define MACVLAN_FLAG_PROMISC 0x1
>>> +
>>> struct macvlan_port {
>>> struct net_device *dev;
>>> struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
>>> @@ -41,6 +44,7 @@ struct macvlan_port {
>>> struct rcu_head rcu;
>>> bool passthru;
>>> int count;
>>> + unsigned int flags;
>>> };
>>>
>>> static void macvlan_port_destroy(struct net_device *dev);
>>> @@ -313,6 +317,7 @@ static int macvlan_open(struct net_device *dev)
>>>
>>> if (vlan->port->passthru) {
>>> dev_set_promiscuity(lowerdev, 1);
>>> + vlan->port->flags |= MACVLAN_FLAG_PROMISC;
>>> goto hash_add;
>>> }
>>>
>>> @@ -345,10 +350,14 @@ static int macvlan_stop(struct net_device *dev)
>>> struct net_device *lowerdev = vlan->lowerdev;
>>>
>>> if (vlan->port->passthru) {
>>> - dev_set_promiscuity(lowerdev, -1);
>>> + if (vlan->port->flags & MACVLAN_FLAG_PROMISC) {
>>> + dev_set_promiscuity(lowerdev, -1);
>>> + vlan->port->flags &= ~MACVLAN_FLAG_PROMISC;
>>> + }
>>> goto hash_del;
>>> }
>>>
>>> + dev_uc_unsync(lowerdev, dev);
>>> dev_mc_unsync(lowerdev, dev);
>>> if (dev->flags & IFF_ALLMULTI)
>>> dev_set_allmulti(lowerdev, -1);
>>> @@ -403,6 +412,7 @@ static void macvlan_set_multicast_list(struct net_device
>>> *dev)
>>> {
>>> struct macvlan_dev *vlan = netdev_priv(dev);
>>>
>>> + dev_uc_sync(vlan->lowerdev, dev);
>>> dev_mc_sync(vlan->lowerdev, dev);
>>> }
>>>
>>> @@ -542,6 +552,58 @@ static int macvlan_vlan_rx_kill_vid(struct net_device
>>> *dev,
>>> return 0;
>>> }
>>>
>>> +static int macvlan_fdb_add(struct ndmsg *ndm,
>>> + struct net_device *dev,
>>> + unsigned char *addr,
>>> + u16 flags)
>>> +{
>>> + struct macvlan_dev *vlan = netdev_priv(dev);
>>> + struct net_device *lowerdev = vlan->lowerdev;
>>> + const struct net_device_ops *ops = lowerdev->netdev_ops;
>>> + int err = -EINVAL;
>>> +
>>> + if (!vlan->port->passthru)
>>> + return -EOPNOTSUPP;
>>> +
>>> + if (vlan->port->flags & MACVLAN_FLAG_PROMISC) {
>>> + dev_set_promiscuity (lowerdev, -1);
>>> + vlan->port->flags &= ~MACVLAN_FLAG_PROMISC;
>>> + }
>>> +
>>> + if (ops->ndo_fdb_add)
>>> + return ops->ndo_fdb_add(ndm, lowerdev, addr, flags);
>>> +
>>> + if (is_unicast_ether_addr(addr))
>>> + err = dev_uc_add_excl(lowerdev, addr);
>>> + else if (is_multicast_ether_addr(addr))
>>> + err = dev_mc_add(lowerdev, addr);
>>> +
>>> + return err;
>>> +}
>>> +
>>> +static int macvlan_fdb_del(struct ndmsg *ndm,
>>> + struct net_device *dev,
>>> + unsigned char *addr)
>>> +{
>>> + struct macvlan_dev *vlan = netdev_priv(dev);
>>> + struct net_device *lowerdev = vlan->lowerdev;
>>> + const struct net_device_ops *ops = lowerdev->netdev_ops;
>>> + int err = -EINVAL;
>>> +
>>> + if (!vlan->port->passthru)
>>> + return -EOPNOTSUPP;
>>> +
>>> + if (ops->ndo_fdb_del)
>>> + return ops->ndo_fdb_del(ndm, lowerdev, addr);
>>> +
>>> + if (is_unicast_ether_addr(addr))
>>> + err = dev_uc_del(lowerdev, addr);
>>> + else if (is_multicast_ether_addr(addr))
>>> + err = dev_mc_del(lowerdev, addr);
>>> +
>>> + return err;
>>> +}
>>> +
>>> static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
>>> struct ethtool_drvinfo *drvinfo)
>>> {
>>> @@ -577,6 +639,9 @@ static const struct net_device_ops macvlan_netdev_ops =
>>> {
>>> .ndo_validate_addr = eth_validate_addr,
>>> .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
>>> .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
>>> + .ndo_fdb_add = macvlan_fdb_add,
>>> + .ndo_fdb_del = macvlan_fdb_del,
>>> + .ndo_fdb_dump = ndo_dflt_fdb_dump,
>>> };
>>>
>>> void macvlan_common_setup(struct net_device *dev)
>>>
>>
>>
>> So this clears the promisc on the first add which
>> is a bit annoying. How about a simple flag, set when
>> we create the macvlan?
>>
>
> Agreed. This probably needs a new attrib maybe IFLA_MACVLAN_FLAGS unless
> there already exists a per "kind" (rtnl_link_ops) flags field we can use.
> I scanned the code briefly and didn't see any such thing so likely we need
> the new attribute.
O ok. That makes sense. Unfortunately I am not sure if I will be able to get
back to this anytime in the near future. If anyone wants to rework this
patch please do.
Thanks.
Roopa
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