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Date: Thu, 11 Dec 2014 18:11:45 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Roopa Prabhu <roopa@...ulusnetworks.com>
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
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.
Let every "upper" to handle ndo_bridge_setlink their way. Sometimes it
might not make sense to propagate to "lowers".
>
>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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