net: dsa: Add overhead to tag protocol ops.

Each DSA tag protocol needs to add additional headers to the Ethernet
frame in order to direct it towards a specific switch egress port. It
must also remove the head from a frame received from a
switch. Indicate the maximum size of these headers in the tag protocol
ops structure, so the core can take these overheads into account.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 23690c4..6ee2e24 100644 (file)
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -113,6 +113,7 @@ struct dsa_device_ops {
                               struct packet_type *pt);
        int (*flow_dissect)(const struct sk_buff *skb, __be16 *proto,
                            int *offset);
+       unsigned int overhead;
 };
 
 struct dsa_switch_tree {

diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c
index 2b06bb9..4aa1d36 100644 (file)
--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -174,6 +174,7 @@ static struct sk_buff *brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev,
 const struct dsa_device_ops brcm_netdev_ops = {
        .xmit   = brcm_tag_xmit,
        .rcv    = brcm_tag_rcv,
+       .overhead = BRCM_TAG_LEN,
 };
 #endif
 
@@ -196,5 +197,6 @@ static struct sk_buff *brcm_tag_rcv_prepend(struct sk_buff *skb,
 const struct dsa_device_ops brcm_prepend_netdev_ops = {
        .xmit   = brcm_tag_xmit_prepend,
        .rcv    = brcm_tag_rcv_prepend,
+       .overhead = BRCM_TAG_LEN,
 };
 #endif

diff --git a/net/dsa/tag_dsa.c b/net/dsa/tag_dsa.c
index cd13cfc..8b2f92e 100644 (file)
--- a/net/dsa/tag_dsa.c
+++ b/net/dsa/tag_dsa.c
@@ -149,4 +149,5 @@ static struct sk_buff *dsa_rcv(struct sk_buff *skb, struct net_device *dev,
 const struct dsa_device_ops dsa_netdev_ops = {
        .xmit   = dsa_xmit,
        .rcv    = dsa_rcv,
+       .overhead = DSA_HLEN,
 };

diff --git a/net/dsa/tag_edsa.c b/net/dsa/tag_edsa.c
index 4083326..f5b87ee 100644 (file)
--- a/net/dsa/tag_edsa.c
+++ b/net/dsa/tag_edsa.c
@@ -168,4 +168,5 @@ static struct sk_buff *edsa_rcv(struct sk_buff *skb, struct net_device *dev,
 const struct dsa_device_ops edsa_netdev_ops = {
        .xmit   = edsa_xmit,
        .rcv    = edsa_rcv,
+       .overhead = EDSA_HLEN,
 };

diff --git a/net/dsa/tag_gswip.c b/net/dsa/tag_gswip.c
index 49e9b73..cb6f82f 100644 (file)
--- a/net/dsa/tag_gswip.c
+++ b/net/dsa/tag_gswip.c
@@ -106,4 +106,5 @@ static struct sk_buff *gswip_tag_rcv(struct sk_buff *skb,
 const struct dsa_device_ops gswip_netdev_ops = {
        .xmit = gswip_tag_xmit,
        .rcv = gswip_tag_rcv,
+       .overhead = GSWIP_RX_HEADER_LEN,
 };

diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
index 0f62eff..96411f7 100644 (file)
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -99,4 +99,5 @@ static struct sk_buff *ksz_rcv(struct sk_buff *skb, struct net_device *dev,
 const struct dsa_device_ops ksz_netdev_ops = {
        .xmit   = ksz_xmit,
        .rcv    = ksz_rcv,
+       .overhead = KSZ_INGRESS_TAG_LEN,
 };

diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
index 548c002..f48889e 100644 (file)
--- a/net/dsa/tag_lan9303.c
+++ b/net/dsa/tag_lan9303.c
@@ -140,4 +140,5 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev,
 const struct dsa_device_ops lan9303_netdev_ops = {
        .xmit = lan9303_xmit,
        .rcv = lan9303_rcv,
+       .overhead = LAN9303_TAG_LEN,
 };

diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c
index 11535bc..f39f4df 100644 (file)
--- a/net/dsa/tag_mtk.c
+++ b/net/dsa/tag_mtk.c
@@ -109,4 +109,5 @@ const struct dsa_device_ops mtk_netdev_ops = {
        .xmit           = mtk_tag_xmit,
        .rcv            = mtk_tag_rcv,
        .flow_dissect   = mtk_tag_flow_dissect,
+       .overhead       = MTK_HDR_LEN,
 };

diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c
index 613f4ee..ed4f6dc 100644 (file)
--- a/net/dsa/tag_qca.c
+++ b/net/dsa/tag_qca.c
@@ -101,4 +101,5 @@ static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev,
 const struct dsa_device_ops qca_netdev_ops = {
        .xmit   = qca_tag_xmit,
        .rcv    = qca_tag_rcv,
+       .overhead = QCA_HDR_LEN,
 };

diff --git a/net/dsa/tag_trailer.c b/net/dsa/tag_trailer.c
index 56197f0..b40756e 100644 (file)
--- a/net/dsa/tag_trailer.c
+++ b/net/dsa/tag_trailer.c
@@ -84,4 +84,5 @@ static struct sk_buff *trailer_rcv(struct sk_buff *skb, struct net_device *dev,
 const struct dsa_device_ops trailer_netdev_ops = {
        .xmit   = trailer_xmit,
        .rcv    = trailer_rcv,
+       .overhead = 4,
 };