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net: dsa: allow switches to work without tagging

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In case switch port tagging is disabled (voluntarily, or the switch just
does not support it), allow us to continue using the defined set of
dsa_device_ops in net/dsa/slave.c.

We introduce dsa_protocol_is_tagged() to check whether we need to
override skb->protocol and go through the DSA-specifif packet_type
function, or if we just go on and receive the SKB through the normal
path.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2014-08-27 17:04:52 -07:00 committed by David S. Miller
parent 0d8bcdd383
commit 5aed85cec2
3 changed files with 26 additions and 4 deletions
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6
include/linux/netdevice.h
View File

@ -1784,10 +1784,10 @@ void dev_net_set(struct net_device *dev, struct net *net)
static inline bool netdev_uses_dsa(struct net_device *dev)
{
#ifdef CONFIG_NET_DSA
return dev->dsa_ptr != NULL;
#else
return false;
if (dev->dsa_ptr != NULL)
return dsa_uses_tagged_protocol(dev->dsa_ptr);
#endif
return false;
}
/**

5
include/net/dsa.h
View File

@ -198,4 +198,9 @@ static inline void *ds_to_priv(struct dsa_switch *ds)
return (void *)(ds + 1);
}
static inline bool dsa_uses_tagged_protocol(struct dsa_switch_tree *dst)
{
return dst->tag_protocol != 0;
}
#endif

19
net/dsa/slave.c
View File

@ -181,6 +181,17 @@ static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
return dst->ops->xmit(skb, dev);
}
static netdev_tx_t dsa_slave_notag_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct dsa_slave_priv *p = netdev_priv(dev);
skb->dev = p->parent->dst->master_netdev;
dev_queue_xmit(skb);
return NETDEV_TX_OK;
}
/* ethtool operations *******************************************************/
static int
@ -314,6 +325,11 @@ static const struct net_device_ops dsa_slave_netdev_ops = {
.ndo_do_ioctl = dsa_slave_ioctl,
};
static const struct dsa_device_ops notag_netdev_ops = {
.xmit = dsa_slave_notag_xmit,
.rcv = NULL,
};
static void dsa_slave_adjust_link(struct net_device *dev)
{
struct dsa_slave_priv *p = netdev_priv(dev);
@ -415,7 +431,8 @@ dsa_slave_create(struct dsa_switch *ds, struct device *parent,
break;
#endif
default:
BUG();
ds->dst->ops = &notag_netdev_ops;
break;
}
SET_NETDEV_DEV(slave_dev, parent);