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Date: Wed, 8 Oct 2008 01:46:07 +0200
From: Lennert Buytenhek <buytenh@...tstofly.org>
To: netdev@...r.kernel.org
Subject: [PATCHv3 4/5] [NET] dsa: add support for Trailer tagging format
This adds support for the Trailer switch tagging format. This is
another tagging that doesn't explicitly mark tagged packets with a
distinct ethertype, so that we need to add a similar hack in the
receive path as for the Original DSA tagging format.
Signed-off-by: Lennert Buytenhek <buytenh@...vell.com>
Tested-by: Byron Bradley <byron.bbradley@...il.com>
Tested-by: Tim Ellis <tim.ellis@....com>
---
include/linux/if_ether.h | 1 +
include/linux/netdevice.h | 10 ++++
include/net/dsa.h | 1 +
net/dsa/Kconfig | 4 ++
net/dsa/Makefile | 1 +
net/dsa/dsa.c | 7 +++
net/dsa/dsa_priv.h | 3 +
net/dsa/slave.c | 5 ++
net/dsa/tag_trailer.c | 130 +++++++++++++++++++++++++++++++++++++++++++++
net/ethernet/eth.c | 2 +
10 files changed, 164 insertions(+), 0 deletions(-)
create mode 100644 net/dsa/tag_trailer.c
diff --git a/include/linux/if_ether.h b/include/linux/if_ether.h
index 32b9dcd..a0099e9 100644
--- a/include/linux/if_ether.h
+++ b/include/linux/if_ether.h
@@ -102,6 +102,7 @@
#define ETH_P_HDLC 0x0019 /* HDLC frames */
#define ETH_P_ARCNET 0x001A /* 1A for ArcNet :-) */
#define ETH_P_DSA 0x001B /* Distributed Switch Arch. */
+#define ETH_P_TRAILER 0x001C /* Trailer switch tagging */
#define ETH_P_PHONET 0x00F5 /* Nokia Phonet frames */
/*
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 97f0c64..d3ea3de 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -812,6 +812,16 @@ static inline bool netdev_uses_dsa_tags(struct net_device *dev)
return 0;
}
+static inline bool netdev_uses_trailer_tags(struct net_device *dev)
+{
+#ifdef CONFIG_NET_DSA_TAG_TRAILER
+ if (dev->dsa_ptr != NULL)
+ return dsa_uses_trailer_tags(dev->dsa_ptr);
+#endif
+
+ return 0;
+}
+
/**
* netdev_priv - access network device private data
* @dev: network device
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 72e509b..52e97bf 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -31,6 +31,7 @@ struct dsa_platform_data {
};
extern bool dsa_uses_dsa_tags(void *dsa_ptr);
+extern bool dsa_uses_trailer_tags(void *dsa_ptr);
#endif
diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
index 79bcd76..505aa14 100644
--- a/net/dsa/Kconfig
+++ b/net/dsa/Kconfig
@@ -18,6 +18,10 @@ config NET_DSA_TAG_EDSA
bool
default n
+config NET_DSA_TAG_TRAILER
+ bool
+ default n
+
# switch drivers
config NET_DSA_MV88E6XXX
diff --git a/net/dsa/Makefile b/net/dsa/Makefile
index 7fb6f85..63d3c44 100644
--- a/net/dsa/Makefile
+++ b/net/dsa/Makefile
@@ -1,6 +1,7 @@
# tagging formats
obj-$(CONFIG_NET_DSA_TAG_DSA) += tag_dsa.o
obj-$(CONFIG_NET_DSA_TAG_EDSA) += tag_edsa.o
+obj-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o
# switch drivers
obj-$(CONFIG_NET_DSA_MV88E6XXX) += mv88e6xxx.o
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index f8c5492..33e9946 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -217,6 +217,13 @@ bool dsa_uses_dsa_tags(void *dsa_ptr)
return !!(ds->tag_protocol == htons(ETH_P_DSA));
}
+bool dsa_uses_trailer_tags(void *dsa_ptr)
+{
+ struct dsa_switch *ds = dsa_ptr;
+
+ return !!(ds->tag_protocol == htons(ETH_P_TRAILER));
+}
+
/* link polling *************************************************************/
static void dsa_link_poll_work(struct work_struct *ugly)
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index 148ade8..5f6af7d 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -108,5 +108,8 @@ int dsa_xmit(struct sk_buff *skb, struct net_device *dev);
/* tag_edsa.c */
int edsa_xmit(struct sk_buff *skb, struct net_device *dev);
+/* tag_trailer.c */
+int trailer_xmit(struct sk_buff *skb, struct net_device *dev);
+
#endif
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 8f8868d..3761688 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -249,6 +249,11 @@ dsa_slave_create(struct dsa_switch *ds, struct device *parent,
slave_dev->hard_start_xmit = edsa_xmit;
break;
#endif
+#ifdef CONFIG_NET_DSA_TAG_TRAILER
+ case htons(ETH_P_TRAILER):
+ slave_dev->hard_start_xmit = trailer_xmit;
+ break;
+#endif
default:
BUG();
}
diff --git a/net/dsa/tag_trailer.c b/net/dsa/tag_trailer.c
new file mode 100644
index 0000000..d311776
--- /dev/null
+++ b/net/dsa/tag_trailer.c
@@ -0,0 +1,130 @@
+/*
+ * net/dsa/tag_trailer.c - Trailer tag format handling
+ * Copyright (c) 2008 Marvell Semiconductor
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include "dsa_priv.h"
+
+int trailer_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct dsa_slave_priv *p = netdev_priv(dev);
+ struct sk_buff *nskb;
+ int padlen;
+ u8 *trailer;
+
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += skb->len;
+
+ /*
+ * We have to make sure that the trailer ends up as the very
+ * last 4 bytes of the packet. This means that we have to pad
+ * the packet to the minimum ethernet frame size, if necessary,
+ * before adding the trailer.
+ */
+ padlen = 0;
+ if (skb->len < 60)
+ padlen = 60 - skb->len;
+
+ nskb = alloc_skb(NET_IP_ALIGN + skb->len + padlen + 4, GFP_ATOMIC);
+ if (nskb == NULL) {
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+ }
+ skb_reserve(nskb, NET_IP_ALIGN);
+
+ skb_reset_mac_header(nskb);
+ skb_set_network_header(nskb, skb_network_header(skb) - skb->head);
+ skb_set_transport_header(nskb, skb_transport_header(skb) - skb->head);
+ skb_copy_and_csum_dev(skb, skb_put(nskb, skb->len));
+ kfree_skb(skb);
+
+ if (padlen) {
+ u8 *pad = skb_put(nskb, padlen);
+ memset(pad, 0, padlen);
+ }
+
+ trailer = skb_put(nskb, 4);
+ trailer[0] = 0x80;
+ trailer[1] = 1 << p->port;
+ trailer[2] = 0x10;
+ trailer[3] = 0x00;
+
+ nskb->protocol = htons(ETH_P_TRAILER);
+
+ nskb->dev = p->parent->master_netdev;
+ dev_queue_xmit(nskb);
+
+ return NETDEV_TX_OK;
+}
+
+static int trailer_rcv(struct sk_buff *skb, struct net_device *dev,
+ struct packet_type *pt, struct net_device *orig_dev)
+{
+ struct dsa_switch *ds = dev->dsa_ptr;
+ u8 *trailer;
+ int source_port;
+
+ if (unlikely(ds == NULL))
+ goto out_drop;
+
+ skb = skb_unshare(skb, GFP_ATOMIC);
+ if (skb == NULL)
+ goto out;
+
+ if (skb_linearize(skb))
+ goto out_drop;
+
+ trailer = skb_tail_pointer(skb) - 4;
+ if (trailer[0] != 0x80 || (trailer[1] & 0xf8) != 0x00 ||
+ (trailer[3] & 0xef) != 0x00 || trailer[3] != 0x00)
+ goto out_drop;
+
+ source_port = trailer[1] & 7;
+ if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL)
+ goto out_drop;
+
+ pskb_trim_rcsum(skb, skb->len - 4);
+
+ skb->dev = ds->ports[source_port];
+ skb_push(skb, ETH_HLEN);
+ skb->protocol = eth_type_trans(skb, skb->dev);
+
+ skb->dev->last_rx = jiffies;
+ skb->dev->stats.rx_packets++;
+ skb->dev->stats.rx_bytes += skb->len;
+
+ netif_receive_skb(skb);
+
+ return 0;
+
+out_drop:
+ kfree_skb(skb);
+out:
+ return 0;
+}
+
+static struct packet_type trailer_packet_type = {
+ .type = __constant_htons(ETH_P_TRAILER),
+ .func = trailer_rcv,
+};
+
+static int __init trailer_init_module(void)
+{
+ dev_add_pack(&trailer_packet_type);
+ return 0;
+}
+module_init(trailer_init_module);
+
+static void __exit trailer_cleanup_module(void)
+{
+ dev_remove_pack(&trailer_packet_type);
+}
+module_exit(trailer_cleanup_module);
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index dae47e7..b9d85af 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -193,6 +193,8 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
*/
if (netdev_uses_dsa_tags(dev))
return htons(ETH_P_DSA);
+ if (netdev_uses_trailer_tags(dev))
+ return htons(ETH_P_TRAILER);
if (ntohs(eth->h_proto) >= 1536)
return eth->h_proto;
--
1.5.6.4
--
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