From b74b70c44986dee87881fbed3d912e02c5dcf78c Mon Sep 17 00:00:00 2001
From: Florian Fainelli <f.fainelli@gmail.com>
Date: Fri, 10 Nov 2017 15:22:54 -0800
Subject: [PATCH] net: dsa: Support prepended Broadcom tag
Add a new type: DSA_TAG_PROTO_PREPEND which allows us to support for the
4-bytes Broadcom tag that we already support, but in a format where it
is pre-pended to the packet instead of located between the MAC SA and
the Ethertyper (DSA_TAG_PROTO_BRCM).
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
include/net/dsa.h | 1 +
net/dsa/Kconfig | 3 +++
net/dsa/Makefile | 1 +
net/dsa/dsa.c | 3 +++
net/dsa/dsa_priv.h | 1 +
net/dsa/tag_brcm.c | 39 ++++++++++++++++++++++++++++++++-------
6 files changed, 41 insertions(+), 7 deletions(-)
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 68e232fd4b0f0..2a05738570d83 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -29,6 +29,7 @@ struct fixed_phy_status;
enum dsa_tag_protocol {
DSA_TAG_PROTO_NONE = 0,
DSA_TAG_PROTO_BRCM,
+ DSA_TAG_PROTO_BRCM_PREPEND,
DSA_TAG_PROTO_DSA,
DSA_TAG_PROTO_EDSA,
DSA_TAG_PROTO_KSZ,
diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
index cc5f8f971689b..2fed892094bcc 100644
--- a/net/dsa/Kconfig
+++ b/net/dsa/Kconfig
@@ -19,6 +19,9 @@ if NET_DSA
config NET_DSA_TAG_BRCM
bool
+config NET_DSA_TAG_BRCM_PREPEND
+ bool
+
config NET_DSA_TAG_DSA
bool
diff --git a/net/dsa/Makefile b/net/dsa/Makefile
index e9a4a0f33e86c..0e13c1f95d13b 100644
--- a/net/dsa/Makefile
+++ b/net/dsa/Makefile
@@ -5,6 +5,7 @@ dsa_core-y += dsa.o dsa2.o legacy.o master.o port.o slave.o switch.o
# tagging formats
dsa_core-$(CONFIG_NET_DSA_TAG_BRCM) += tag_brcm.o
+dsa_core-$(CONFIG_NET_DSA_TAG_BRCM_PREPEND) += tag_brcm.o
dsa_core-$(CONFIG_NET_DSA_TAG_DSA) += tag_dsa.o
dsa_core-$(CONFIG_NET_DSA_TAG_EDSA) += tag_edsa.o
dsa_core-$(CONFIG_NET_DSA_TAG_KSZ) += tag_ksz.o
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index b8f2d9f7c3edf..6a9d0f50fbeea 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -44,6 +44,9 @@ const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
#ifdef CONFIG_NET_DSA_TAG_BRCM
[DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
#endif
+#ifdef CONFIG_NET_DSA_TAG_BRCM_PREPEND
+ [DSA_TAG_PROTO_BRCM_PREPEND] = &brcm_prepend_netdev_ops,
+#endif
#ifdef CONFIG_NET_DSA_TAG_DSA
[DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
#endif
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index 507e1ce4d4d2d..7d036696e8c47 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -191,6 +191,7 @@ void dsa_switch_unregister_notifier(struct dsa_switch *ds);
/* tag_brcm.c */
extern const struct dsa_device_ops brcm_netdev_ops;
+extern const struct dsa_device_ops brcm_prepend_netdev_ops;
/* tag_dsa.c */
extern const struct dsa_device_ops dsa_netdev_ops;
diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c
index 771409a1e65c0..e6e0b7b6025c1 100644
--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -96,13 +96,6 @@ static struct sk_buff *brcm_tag_xmit_ll(struct sk_buff *skb,
return skb;
}
-static struct sk_buff *brcm_tag_xmit(struct sk_buff *skb,
- struct net_device *dev)
-{
- /* Build the tag after the MAC Source Address */
- return brcm_tag_xmit_ll(skb, dev, 2 * ETH_ALEN);
-}
-
static struct sk_buff *brcm_tag_rcv_ll(struct sk_buff *skb,
struct net_device *dev,
struct packet_type *pt,
@@ -139,6 +132,15 @@ static struct sk_buff *brcm_tag_rcv_ll(struct sk_buff *skb,
return skb;
}
+#ifdef CONFIG_NET_DSA_TAG_BRCM
+static struct sk_buff *brcm_tag_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ /* Build the tag after the MAC Source Address */
+ return brcm_tag_xmit_ll(skb, dev, 2 * ETH_ALEN);
+}
+
+
static struct sk_buff *brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt)
{
@@ -161,3 +163,26 @@ const struct dsa_device_ops brcm_netdev_ops = {
.xmit = brcm_tag_xmit,
.rcv = brcm_tag_rcv,
};
+#endif
+
+#ifdef CONFIG_NET_DSA_TAG_BRCM_PREPEND
+static struct sk_buff *brcm_tag_xmit_prepend(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ /* tag is prepended to the packet */
+ return brcm_tag_xmit_ll(skb, dev, 0);
+}
+
+static struct sk_buff *brcm_tag_rcv_prepend(struct sk_buff *skb,
+ struct net_device *dev,
+ struct packet_type *pt)
+{
+ /* tag is prepended to the packet */
+ return brcm_tag_rcv_ll(skb, dev, pt, ETH_HLEN);
+}
+
+const struct dsa_device_ops brcm_prepend_netdev_ops = {
+ .xmit = brcm_tag_xmit_prepend,
+ .rcv = brcm_tag_rcv_prepend,
+};
+#endif
--
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