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net: dsa: Prevent usage of NET_DSA_TAG_8021Q as tagging protocol

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It is possible for a switch driver to use NET_DSA_TAG_8021Q as a valid
DSA tagging protocol since it registers itself as such, unfortunately
since there are not xmit or rcv functions provided, the lack of a xmit()
function will lead to a NPD in dsa_slave_xmit() to start with.

net/dsa/tag_8021q.c is only comprised of a set of helper functions at
the moment, but is not a fully autonomous or functional tagging "driver"
(though it could become later on). We do not have any users of
NET_DSA_TAG_8021Q so now is a good time to make sure there are not
issues being encountered by making this file strictly a place holder for
helper functions.

Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
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 2019-11-11 20:38:46 -08:00 committed by David S. Miller
parent 46cb01eeeb
commit 129bd7ca8a
2 changed files with 1 additions and 10 deletions
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2
net/dsa/Kconfig
View File

@ -20,7 +20,7 @@ if NET_DSA
# tagging formats
config NET_DSA_TAG_8021Q
tristate "Tag driver for switches using custom 802.1Q VLAN headers"
tristate
select VLAN_8021Q
help
Unlike the other tagging protocols, the 802.1Q config option simply

9
net/dsa/tag_8021q.c
View File

@ -341,13 +341,4 @@ struct sk_buff *dsa_8021q_remove_header(struct sk_buff *skb)
}
EXPORT_SYMBOL_GPL(dsa_8021q_remove_header);
static const struct dsa_device_ops dsa_8021q_netdev_ops = {
.name = "8021q",
.proto = DSA_TAG_PROTO_8021Q,
.overhead = VLAN_HLEN,
};
MODULE_LICENSE("GPL v2");
MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_8021Q);
module_dsa_tag_driver(dsa_8021q_netdev_ops);