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Message-ID: <5489DB73.1080808@cumulusnetworks.com>
Date: Thu, 11 Dec 2014 09:59:15 -0800
From: Roopa Prabhu <roopa@...ulusnetworks.com>
To: Jiri Pirko <jiri@...nulli.us>
CC: sfeldma@...il.com, jhs@...atatu.com, bcrl@...ck.org, tgraf@...g.ch,
john.fastabend@...il.com, stephen@...workplumber.org,
linville@...driver.com, vyasevic@...hat.com,
netdev@...r.kernel.org, davem@...emloft.net,
shm@...ulusnetworks.com, gospo@...ulusnetworks.com
Subject: Re: [PATCH net-next v2 2/4] swdevice: add new api to set and del
bridge port attributes
On 12/11/14, 9:11 AM, Jiri Pirko wrote:
> Thu, Dec 11, 2014 at 05:52:10PM CET, roopa@...ulusnetworks.com wrote:
>> On 12/10/14, 1:37 AM, Jiri Pirko wrote:
>>> Wed, Dec 10, 2014 at 10:05:18AM CET, roopa@...ulusnetworks.com wrote:
>>>> From: Roopa Prabhu <roopa@...ulusnetworks.com>
>>>>
>>>> This patch adds two new api's netdev_switch_port_bridge_setlink
>>>> and netdev_switch_port_bridge_dellink to offload bridge port attributes
>>>> to switch asic
>>>>
>>>> (The names of the apis look odd with 'switch_port_bridge',
>>>> but am more inclined to change the prefix of the api to something else.
>>>> Will take any suggestions).
>>>>
>>>> The api's look at the NETIF_F_HW_NETFUNC_OFFLOAD feature flag to
>>>> pass bridge port attributes to the port device.
>>>>
>>>> If the device has the NETIF_F_HW_NETFUNC_OFFLOAD, but does not support
>>>> the bridge port attribute offload ndo, call bridge port attribute ndo's on
>>>> the lowerdevs if supported. This is one way to pass bridge port attributes
>>>> through stacked netdevs (example when bridge port is a bond and bond slaves
>>>> are switch ports).
>>>>
>>>> Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
>>>> ---
>>>> include/net/switchdev.h | 5 +++-
>>>> net/switchdev/switchdev.c | 70 +++++++++++++++++++++++++++++++++++++++++++++
>>>> 2 files changed, 74 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/include/net/switchdev.h b/include/net/switchdev.h
>>>> index 8a6d164..22676b6 100644
>>>> --- a/include/net/switchdev.h
>>>> +++ b/include/net/switchdev.h
>>>> @@ -17,7 +17,10 @@
>>>> int netdev_switch_parent_id_get(struct net_device *dev,
>>>> struct netdev_phys_item_id *psid);
>>>> int netdev_switch_port_stp_update(struct net_device *dev, u8 state);
>>>> -
>>>> +int netdev_switch_port_bridge_setlink(struct net_device *dev,
>>>> + struct nlmsghdr *nlh, u16 flags);
>>>> +int netdev_switch_port_bridge_dellink(struct net_device *dev,
>>>> + struct nlmsghdr *nlh, u16 flags);
>>>> #else
>>>>
>>>> static inline int netdev_switch_parent_id_get(struct net_device *dev,
>>>> diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
>>>> index d162b21..62317e1 100644
>>>> --- a/net/switchdev/switchdev.c
>>>> +++ b/net/switchdev/switchdev.c
>>>> @@ -50,3 +50,73 @@ int netdev_switch_port_stp_update(struct net_device *dev, u8 state)
>>>> return ops->ndo_switch_port_stp_update(dev, state);
>>>> }
>>>> EXPORT_SYMBOL(netdev_switch_port_stp_update);
>>>> +
>>>> +/**
>>>> + * netdev_switch_port_bridge_setlink - Notify switch device port of bridge
>>>> + * port attributes
>>>> + *
>>>> + * @dev: port device
>>>> + * @nlh: netlink msg with bridge port attributes
>>>> + *
>>>> + * Notify switch device port of bridge port attributes
>>>> + */
>>>> +int netdev_switch_port_bridge_setlink(struct net_device *dev,
>>>> + struct nlmsghdr *nlh, u16 flags)
>>>> +{
>>>> + const struct net_device_ops *ops = dev->netdev_ops;
>>>> + struct net_device *lower_dev;
>>>> + struct list_head *iter;
>>>> + int ret = 0, err = 0;
>>>> +
>>>> + if (!(dev->features & NETIF_F_HW_NETFUNC_OFFLOAD))
>>>> + return err;
>>>> +
>>>> + if (ops->ndo_bridge_setlink) {
>>>> + WARN_ON(!ops->ndo_switch_parent_id_get);
>>>> + return ops->ndo_bridge_setlink(dev, nlh, flags);
>>> You have to change ndo_bridge_setlink in netdevice.h first.
>>> Otherwise when only this patch is applied (during bisection)
>>> this won't compile.
>> ack, will fix it and keep that in mind next time.
>>>> + }
>>>> +
>>>> + netdev_for_each_lower_dev(dev, lower_dev, iter) {
>>> I do not understand why to iterate over lower devices. At this
>>> stage we don't know a thing about this upper or its lowers. Let
>>> the uppers (/masters) to decide if this needs to be propagated
>>> or not.
>> Jiri, In the stacked devices case, there is no way to propagate the bridge
>> port attributes to switch device driver today (vlan and other bridge port
>> attributes). Can you tell me if there is a way ?. no, ndo_vlan* ndo's are not
>> useful here. Nor we should go and implement ndo_bridge_setlink* in all
>> devices that can be bridge ports.
>
> Hmm. I just think that is cleaner to implement ndo_bridge_setlink in
> bonding for example and let it propagate the the call to slaves.
No, that will require bridge attribute support in all drivers. And that
is no good.
> Let every "upper" to handle ndo_bridge_setlink their way. Sometimes it
> might not make sense to propagate to "lowers".
This does not really propagate to lowers. It is just trying to get to a
switch port and from there to the switch driver.
Example, bond driver does not need to care if its a bridge port. It will
simply pass the call to its slave which
might be a switch port.
bond driver does not care if its a bridge port. But the switch driver
cares, because it knows that the bond was created with switch ports.
>
>> And this allows a switch driver to receive these callbacks if it has marked
>> the switch port with an offload flag. Your way of using the switch port to
>> get to the switch driver does not help in these cases.
> I do not follow how this is related to this case (stacked layout).
>
>> The other option is to use the 'switch device (not port)' to get to the
>> switch driver.
>
> That would not help this case (stacked layout) I believe.
>
>
>> This patch shows that you can still do this with the ndo ops.
>>>> + err = netdev_switch_port_bridge_setlink(lower_dev, nlh, flags);
>>>> + if (err)
>>>> + ret = err;
>>>> + }
>>> ^^^^^ Indent is off. This should be catched by scripts/checkpatch.pl.
>>>
>>>> +
>>>> + return ret;
>>>> +}
>>>> +EXPORT_SYMBOL(netdev_switch_port_bridge_setlink);
>>>> +
>>>> +/**
>>>> + * netdev_switch_port_bridge_dellink - Notify switch device port of bridge
>>>> + * attribute delete
>>>> + *
>>>> + * @dev: port device
>>>> + * @nlh: netlink msg with bridge port attributes
>>>> + *
>>>> + * Notify switch device port of bridge port attribute delete
>>>> + */
>>>> +int netdev_switch_port_bridge_dellink(struct net_device *dev,
>>>> + struct nlmsghdr *nlh, u16 flags)
>>>> +{
>>>> + const struct net_device_ops *ops = dev->netdev_ops;
>>>> + struct net_device *lower_dev;
>>>> + struct list_head *iter;
>>>> + int ret = 0, err = 0;
>>>> +
>>>> + if (!(dev->features & NETIF_F_HW_NETFUNC_OFFLOAD))
>>>> + return err;
>>>> +
>>>> + if (ops->ndo_bridge_dellink) {
>>>> + WARN_ON(!ops->ndo_switch_parent_id_get);
>>>> + return ops->ndo_bridge_dellink(dev, nlh, flags);
>>>> + }
>>>> +
>>>> + netdev_for_each_lower_dev(dev, lower_dev, iter) {
>>>> + err = netdev_switch_port_bridge_dellink(lower_dev, nlh, flags);
>>>> + if (err)
>>>> + ret = err;
>>>> + }
>>>> +
>>>> + return ret;
>>>> +}
>>>> +EXPORT_SYMBOL(netdev_switch_port_bridge_dellink);
>>>> --
>>>> 1.7.10.4
>>>>
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