path: root/net/dsa/dsa.c
diff options
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/dsa/dsa.c
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/dsa/dsa.c')
1 files changed, 16 insertions, 0 deletions
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 6cc5be2ec7f1..f8c549281c30 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -202,6 +202,22 @@ static void dsa_switch_destroy(struct dsa_switch *ds)
+/* hooks for ethertype-less tagging formats *********************************/
+ * The original DSA tag format and some other tag formats have no
+ * ethertype, which means that we need to add a little hack to the
+ * networking receive path to make sure that received frames get
+ * the right ->protocol assigned to them when one of those tag
+ * formats is in use.
+ */
+bool dsa_uses_dsa_tags(void *dsa_ptr)
+ struct dsa_switch *ds = dsa_ptr;
+ return !!(ds->tag_protocol == htons(ETH_P_DSA));
/* link polling *************************************************************/
static void dsa_link_poll_work(struct work_struct *ugly)

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