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authorLennert Buytenhek <buytenh@wantstofly.org>2008-10-07 13:45:02 +0000
committerDavid S. Miller <davem@davemloft.net>2008-10-08 17:19:56 -0700
commitcf85d08fdf4548ee46657ccfb7f9949a85145db5 (patch)
tree583e251b0d772c23ca931a207e9ac0995d679f44 /net/ethernet
parent91da11f870f00a3322b81c73042291d7f0be5a17 (diff)
dsa: add support for original DSA tagging format
Most of the DSA switches currently in the field do not support the Ethertype DSA tagging format that one of the previous patches added support for, but only the original DSA tagging format. The original DSA tagging format carries the same information as the Ethertype DSA tagging format, but with the difference that it does not have an ethertype field. In other words, when receiving a packet that is tagged with an original DSA tag, there is no way of telling in eth_type_trans() that this packet is in fact a DSA-tagged packet. This patch adds a hook into eth_type_trans() which is only compiled in if support for a switch chip that doesn't support Ethertype DSA is selected, and which checks whether there is a DSA switch driver instance attached to this network device which uses the old tag format. If so, it sets the protocol field to ETH_P_DSA without looking at the packet, so that the packet ends up in the right place. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Tested-by: Nicolas Pitre <nico@marvell.com> Tested-by: Peter van Valderen <linux@ddcrew.com> Tested-by: Dirk Teurlings <dirk@upexia.nl> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ethernet')
-rw-r--r--net/ethernet/eth.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 647a9edee375..dae47e7a44d8 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -57,6 +57,7 @@
#include <net/sock.h>
#include <net/ipv6.h>
#include <net/ip.h>
+#include <net/dsa.h>
#include <asm/uaccess.h>
#include <asm/system.h>
@@ -184,6 +185,15 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
skb->pkt_type = PACKET_OTHERHOST;
}
+ /*
+ * Some variants of DSA tagging don't have an ethertype field
+ * at all, so we check here whether one of those tagging
+ * variants has been configured on the receiving interface,
+ * and if so, set skb->protocol without looking at the packet.
+ */
+ if (netdev_uses_dsa_tags(dev))
+ return htons(ETH_P_DSA);
+
if (ntohs(eth->h_proto) >= 1536)
return eth->h_proto;

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