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net: dsa: reduce number of protocol hooks

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DSA is currently registering one packet_type function per EtherType it
needs to intercept in the receive path of a DSA-enabled Ethernet device.
Right now we have three of them: trailer, DSA and eDSA, and there might
be more in the future, this will not scale to the addition of new
protocols.

This patch proceeds with adding a new layer of abstraction and two new
functions:

dsa_switch_rcv() which will dispatch into the tag-protocol specific
receive function implemented by net/dsa/tag_*.c

dsa_slave_xmit() which will dispatch into the tag-protocol specific
transmit function implemented by net/dsa/tag_*.c

When we do create the per-port slave network devices, we iterate over
the switch protocol to assign the DSA-specific receive and transmit
operations.

A new fake ethertype value is used: ETH_P_XDSA to illustrate the fact
that this is no longer going to look like ETH_P_DSA or ETH_P_TRAILER
like it used to be.

This allows us to greatly simplify the check in eth_type_trans() and
always override the skb->protocol with ETH_P_XDSA for Ethernet switches
tagged protocol, while also reducing the number repetitive slave
netdevice_ops assignments.

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 17:04:46 -07:00
committed by David S. Miller
parent 8663dc2002
commit 3e8a72d1da
10 changed files with 68 additions and 105 deletions
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45
net/dsa/slave.c
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@@ -171,6 +171,14 @@ static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
return -EOPNOTSUPP;
}
static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct dsa_slave_priv *p = netdev_priv(dev);
struct dsa_switch_tree *dst = p->parent->dst;
return dst->ops->xmit(skb, dev);
}
/* ethtool operations *******************************************************/
static int
@@ -293,42 +301,16 @@ static const struct ethtool_ops dsa_slave_ethtool_ops = {
.get_sset_count = dsa_slave_get_sset_count,
};
#ifdef CONFIG_NET_DSA_TAG_DSA
static const struct net_device_ops dsa_netdev_ops = {
static const struct net_device_ops dsa_slave_netdev_ops = {
.ndo_init = dsa_slave_init,
.ndo_open = dsa_slave_open,
.ndo_stop = dsa_slave_close,
.ndo_start_xmit = dsa_xmit,
.ndo_start_xmit = dsa_slave_xmit,
.ndo_change_rx_flags = dsa_slave_change_rx_flags,
.ndo_set_rx_mode = dsa_slave_set_rx_mode,
.ndo_set_mac_address = dsa_slave_set_mac_address,
.ndo_do_ioctl = dsa_slave_ioctl,
};
#endif
#ifdef CONFIG_NET_DSA_TAG_EDSA
static const struct net_device_ops edsa_netdev_ops = {
.ndo_init = dsa_slave_init,
.ndo_open = dsa_slave_open,
.ndo_stop = dsa_slave_close,
.ndo_start_xmit = edsa_xmit,
.ndo_change_rx_flags = dsa_slave_change_rx_flags,
.ndo_set_rx_mode = dsa_slave_set_rx_mode,
.ndo_set_mac_address = dsa_slave_set_mac_address,
.ndo_do_ioctl = dsa_slave_ioctl,
};
#endif
#ifdef CONFIG_NET_DSA_TAG_TRAILER
static const struct net_device_ops trailer_netdev_ops = {
.ndo_init = dsa_slave_init,
.ndo_open = dsa_slave_open,
.ndo_stop = dsa_slave_close,
.ndo_start_xmit = trailer_xmit,
.ndo_change_rx_flags = dsa_slave_change_rx_flags,
.ndo_set_rx_mode = dsa_slave_set_rx_mode,
.ndo_set_mac_address = dsa_slave_set_mac_address,
.ndo_do_ioctl = dsa_slave_ioctl,
};
#endif
/* slave device setup *******************************************************/
struct net_device *
@@ -349,21 +331,22 @@ dsa_slave_create(struct dsa_switch *ds, struct device *parent,
slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
eth_hw_addr_inherit(slave_dev, master);
slave_dev->tx_queue_len = 0;
slave_dev->netdev_ops = &dsa_slave_netdev_ops;
switch (ds->dst->tag_protocol) {
#ifdef CONFIG_NET_DSA_TAG_DSA
case htons(ETH_P_DSA):
slave_dev->netdev_ops = &dsa_netdev_ops;
ds->dst->ops = &dsa_netdev_ops;
break;
#endif
#ifdef CONFIG_NET_DSA_TAG_EDSA
case htons(ETH_P_EDSA):
slave_dev->netdev_ops = &edsa_netdev_ops;
ds->dst->ops = &edsa_netdev_ops;
break;
#endif
#ifdef CONFIG_NET_DSA_TAG_TRAILER
case htons(ETH_P_TRAILER):
slave_dev->netdev_ops = &trailer_netdev_ops;
ds->dst->ops = &trailer_netdev_ops;
break;
#endif
default: