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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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39
net/dsa/dsa.c
View file

@ -608,6 +608,24 @@ static void dsa_shutdown(struct platform_device *pdev)
{
}
static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
struct dsa_switch_tree *dst = dev->dsa_ptr;
if (unlikely(dst == NULL)) {
kfree_skb(skb);
return 0;
}
return dst->ops->rcv(skb, dev, pt, orig_dev);
}
struct packet_type dsa_pack_type __read_mostly = {
.type = cpu_to_be16(ETH_P_XDSA),
.func = dsa_switch_rcv,
};
static const struct of_device_id dsa_of_match_table[] = {
{ .compatible = "marvell,dsa", },
{}
@ -633,30 +651,15 @@ static int __init dsa_init_module(void)
if (rc)
return rc;
#ifdef CONFIG_NET_DSA_TAG_DSA
dev_add_pack(&dsa_packet_type);
#endif
#ifdef CONFIG_NET_DSA_TAG_EDSA
dev_add_pack(&edsa_packet_type);
#endif
#ifdef CONFIG_NET_DSA_TAG_TRAILER
dev_add_pack(&trailer_packet_type);
#endif
dev_add_pack(&dsa_pack_type);
return 0;
}
module_init(dsa_init_module);
static void __exit dsa_cleanup_module(void)
{
#ifdef CONFIG_NET_DSA_TAG_TRAILER
dev_remove_pack(&trailer_packet_type);
#endif
#ifdef CONFIG_NET_DSA_TAG_EDSA
dev_remove_pack(&edsa_packet_type);
#endif
#ifdef CONFIG_NET_DSA_TAG_DSA
dev_remove_pack(&dsa_packet_type);
#endif
dev_remove_pack(&dsa_pack_type);
platform_driver_unregister(&dsa_driver);
}
module_exit(dsa_cleanup_module);