netdev - Re: [PATCH net-next RFC v2] switchdev: bridge: drop hardware forwarded packets

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Message-ID: <CAE4R7bDLi2hjA8iqtHZgbW=D4KZwJ_LLnpK2b0kNHzHoAVvN9g@mail.gmail.com>
Date:	Tue, 24 Mar 2015 10:58:15 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Jiri Pirko <jiri@...nulli.us>, roopa <roopa@...ulusnetworks.com>,
	John Fastabend <john.fastabend@...il.com>,
	Andrew Lunn <andrew@...n.ch>,
	David Miller <davem@...emloft.net>,
	"Arad, Ronen" <ronen.arad@...el.com>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next RFC v2] switchdev: bridge: drop hardware
 forwarded packets

On Tue, Mar 24, 2015 at 9:01 AM, Guenter Roeck <linux@...ck-us.net> wrote:
> On Tue, Mar 24, 2015 at 03:29:21PM +0100, Jiri Pirko wrote:
>> >
>> >diff --git a/drivers/net/ethernet/rocker/rocker.c
>> >b/drivers/net/ethernet/rocker/rocker.c
>> >index aab962c..0f7217f7 100644
>> >--- a/drivers/net/ethernet/rocker/rocker.c
>> >+++ b/drivers/net/ethernet/rocker/rocker.c
>> >@@ -3931,15 +3931,28 @@ unmap_frag:
>> >        return -EMSGSIZE;
>> > }
>> >
>> >+static bool rocker_port_dev_check(struct net_device *dev);
>> >+
>> > static netdev_tx_t rocker_port_xmit(struct sk_buff *skb, struct
>> >net_device *dev)
>> > {
>> >        struct rocker_port *rocker_port = netdev_priv(dev);
>> >        struct rocker *rocker = rocker_port->rocker;
>> >        struct rocker_desc_info *desc_info;
>> >        struct rocker_tlv *frags;
>> >+       struct net_device *in_dev;
>> >        int i;
>> >        int err;
>> >
>> >+       if (rocker_port_is_bridged(rocker_port)) {
>> >+               rcu_read_lock();
>> >+               in_dev = dev_get_by_index_rcu(dev_net(dev), skb->skb_iif);
>>
>> Hmm, you iterate over all ports for every xmit call :/
>> Would be nicer if skb_iif would be netdev poiter. Not sure it is doable.
>>
> It may be easier (and faster) to loop through all rocker ports and try to find
> one with the same ifindex. Then the dev_check call would not be necessary.
>
> If the rocker switch can be attached to multiple bridges, it may also be
> necessary to check if the bridge group is the same for both ports.
>
> Guenter

Yes, good suggestions.  This is the flexibility part if we do the
check in the driver rather than code above.
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