@@ -101,6 +101,7 @@
#define ETH_P_ECONET 0x0018 /* Acorn Econet */
#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_PHONET 0x00F5 /* Nokia Phonet frames */
/*
@@ -42,6 +42,7 @@
#include <linux/workqueue.h>
#include <net/net_namespace.h>
+#include <net/dsa.h>
struct vlan_group;
struct ethtool_ops;
@@ -801,6 +802,16 @@ void dev_net_set(struct net_device *dev, struct net *net)
#endif
}
+static inline bool netdev_uses_dsa_tags(struct net_device *dev)
+{
+#ifdef CONFIG_NET_DSA_TAG_DSA
+ if (dev->dsa_ptr != NULL)
+ return dsa_uses_dsa_tags(dev->dsa_ptr);
+#endif
+
+ return 0;
+}
+
/**
* netdev_priv - access network device private data
* @dev: network device
@@ -30,5 +30,7 @@ struct dsa_platform_data {
char *port_names[DSA_MAX_PORTS];
};
+extern bool dsa_uses_dsa_tags(void *dsa_ptr);
+
#endif
@@ -10,6 +10,10 @@ menuconfig NET_DSA
if NET_DSA
# tagging formats
+config NET_DSA_TAG_DSA
+ bool
+ default n
+
config NET_DSA_TAG_EDSA
bool
default n
@@ -1,4 +1,5 @@
# tagging formats
+obj-$(CONFIG_NET_DSA_TAG_DSA) += tag_dsa.o
obj-$(CONFIG_NET_DSA_TAG_EDSA) += tag_edsa.o
# switch drivers
@@ -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)
{
@@ -102,6 +102,9 @@ struct net_device *dsa_slave_create(struct dsa_switch *ds,
struct device *parent,
int port, char *name);
+/* tag_dsa.c */
+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);
@@ -192,15 +192,19 @@ static int mv88e6123_61_65_setup_port(struct dsa_switch *ds, int p)
/*
* Port Control: disable Drop-on-Unlock, disable Drop-on-Lock,
- * configure the EDSA tagging mode if this is the CPU port,
- * disable Header mode, enable IGMP/MLD snooping, disable VLAN
- * tunneling, determine priority by looking at 802.1p and IP
- * priority fields (IP prio has precedence), and set STP state
- * to Forwarding. Finally, if this is the CPU port, additionally
- * enable forwarding of unknown unicast and multicast addresses.
+ * configure the requested (DSA/EDSA) tagging mode if this is
+ * the CPU port, disable Header mode, enable IGMP/MLD snooping,
+ * disable VLAN tunneling, determine priority by looking at
+ * 802.1p and IP priority fields (IP prio has precedence), and
+ * set STP state to Forwarding. Finally, if this is the CPU
+ * port, additionally enable forwarding of unknown unicast and
+ * multicast addresses.
*/
REG_WRITE(addr, 0x04,
- (p == ds->cpu_port) ? 0x373f : 0x0433);
+ (p == ds->cpu_port) ?
+ (ds->tag_protocol == htons(ETH_P_DSA)) ?
+ 0x053f : 0x373f :
+ 0x0433);
/*
* Port Control 1: disable trunking. Also, if this is the
@@ -239,6 +239,11 @@ dsa_slave_create(struct dsa_switch *ds, struct device *parent,
memcpy(slave_dev->dev_addr, master->dev_addr, ETH_ALEN);
slave_dev->tx_queue_len = 0;
switch (ds->tag_protocol) {
+#ifdef CONFIG_NET_DSA_TAG_DSA
+ case htons(ETH_P_DSA):
+ slave_dev->hard_start_xmit = dsa_xmit;
+ break;
+#endif
#ifdef CONFIG_NET_DSA_TAG_EDSA
case htons(ETH_P_EDSA):
slave_dev->hard_start_xmit = edsa_xmit;
new file mode 100644
@@ -0,0 +1,194 @@
+/*
+ * net/dsa/tag_dsa.c - (Non-ethertype) DSA tagging
+ * 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"
+
+#define DSA_HLEN 4
+
+int dsa_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct dsa_slave_priv *p = netdev_priv(dev);
+ u8 *dsa_header;
+
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += skb->len;
+
+ /*
+ * Convert the outermost 802.1q tag to a DSA tag for tagged
+ * packets, or insert a DSA tag between the addresses and
+ * the ethertype field for untagged packets.
+ */
+ if (skb->protocol == htons(ETH_P_8021Q)) {
+ if (skb_cow_head(skb, 0) < 0)
+ goto out_free;
+
+ /*
+ * Construct tagged FROM_CPU DSA tag from 802.1q tag.
+ */
+ dsa_header = skb->data + 2 * ETH_ALEN;
+ dsa_header[0] = 0x60;
+ dsa_header[1] = p->port << 3;
+
+ /*
+ * Move CFI field from byte 2 to byte 1.
+ */
+ if (dsa_header[2] & 0x10) {
+ dsa_header[1] |= 0x01;
+ dsa_header[2] &= ~0x10;
+ }
+ } else {
+ if (skb_cow_head(skb, DSA_HLEN) < 0)
+ goto out_free;
+ skb_push(skb, DSA_HLEN);
+
+ memmove(skb->data, skb->data + DSA_HLEN, 2 * ETH_ALEN);
+
+ /*
+ * Construct untagged FROM_CPU DSA tag.
+ */
+ dsa_header = skb->data + 2 * ETH_ALEN;
+ dsa_header[0] = 0x40;
+ dsa_header[1] = p->port << 3;
+ dsa_header[2] = 0x00;
+ dsa_header[3] = 0x00;
+ }
+
+ skb->protocol = htons(ETH_P_DSA);
+
+ skb->dev = p->parent->master_netdev;
+ dev_queue_xmit(skb);
+
+ return NETDEV_TX_OK;
+
+out_free:
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+static int dsa_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 *dsa_header;
+ int source_port;
+
+ if (unlikely(ds == NULL))
+ goto out_drop;
+
+ skb = skb_unshare(skb, GFP_ATOMIC);
+ if (skb == NULL)
+ goto out;
+
+ if (unlikely(!pskb_may_pull(skb, DSA_HLEN)))
+ goto out_drop;
+
+ /*
+ * The ethertype field is part of the DSA header.
+ */
+ dsa_header = skb->data - 2;
+
+ /*
+ * Check that frame type is either TO_CPU or FORWARD, and
+ * that the source device is zero.
+ */
+ if ((dsa_header[0] & 0xdf) != 0x00 && (dsa_header[0] & 0xdf) != 0xc0)
+ goto out_drop;
+
+ /*
+ * Check that the source port is a registered DSA port.
+ */
+ source_port = (dsa_header[1] >> 3) & 0x1f;
+ if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL)
+ goto out_drop;
+
+ /*
+ * Convert the DSA header to an 802.1q header if the 'tagged'
+ * bit in the DSA header is set. If the 'tagged' bit is clear,
+ * delete the DSA header entirely.
+ */
+ if (dsa_header[0] & 0x20) {
+ u8 new_header[4];
+
+ /*
+ * Insert 802.1q ethertype and copy the VLAN-related
+ * fields, but clear the bit that will hold CFI (since
+ * DSA uses that bit location for another purpose).
+ */
+ new_header[0] = (ETH_P_8021Q >> 8) & 0xff;
+ new_header[1] = ETH_P_8021Q & 0xff;
+ new_header[2] = dsa_header[2] & ~0x10;
+ new_header[3] = dsa_header[3];
+
+ /*
+ * Move CFI bit from its place in the DSA header to
+ * its 802.1q-designated place.
+ */
+ if (dsa_header[1] & 0x01)
+ new_header[2] |= 0x10;
+
+ /*
+ * Update packet checksum if skb is CHECKSUM_COMPLETE.
+ */
+ if (skb->ip_summed == CHECKSUM_COMPLETE) {
+ __wsum c = skb->csum;
+ c = csum_add(c, csum_partial(new_header + 2, 2, 0));
+ c = csum_sub(c, csum_partial(dsa_header + 2, 2, 0));
+ skb->csum = c;
+ }
+
+ memcpy(dsa_header, new_header, DSA_HLEN);
+ } else {
+ /*
+ * Remove DSA tag and update checksum.
+ */
+ skb_pull_rcsum(skb, DSA_HLEN);
+ memmove(skb->data - ETH_HLEN,
+ skb->data - ETH_HLEN - DSA_HLEN,
+ 2 * ETH_ALEN);
+ }
+
+ 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 dsa_packet_type = {
+ .type = __constant_htons(ETH_P_DSA),
+ .func = dsa_rcv,
+};
+
+static int __init dsa_init_module(void)
+{
+ dev_add_pack(&dsa_packet_type);
+ return 0;
+}
+module_init(dsa_init_module);
+
+static void __exit dsa_cleanup_module(void)
+{
+ dev_remove_pack(&dsa_packet_type);
+}
+module_exit(dsa_cleanup_module);
@@ -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;