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Message-Id: <1408905869-10471-10-git-send-email-f.fainelli@gmail.com>
Date: Sun, 24 Aug 2014 11:44:26 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: netdev@...r.kernel.org
Cc: davem@...emlof.net, jhs@...atatu.com, linville@...driver.com,
alexander.h.duyck@...el.com,
Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH net-next v3 09/12] net: dsa: add Broadcom tag RX/TX handler
Add support for the 4-bytes Broadcom tag that built-in switches such as
the Starfighter 2 might insert when receiving packets, or that we need
to insert while targetting specific switch ports. We use a fake
EtherType field for this 4-bytes switch tag: ETH_P_BRCMTAG since we need
to use the skb->protocol override in the receive path.
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
Changes in v3:
- add ETH_P_BRCMTAG as part of this changeset and not in a previous patch
- fixed an early de-reference in the receive hook
include/uapi/linux/if_ether.h | 1 +
net/dsa/Kconfig | 3 +
net/dsa/Makefile | 1 +
net/dsa/dsa.c | 6 ++
net/dsa/dsa_priv.h | 4 +
net/dsa/slave.c | 17 +++++
net/dsa/tag_brcm.c | 173 ++++++++++++++++++++++++++++++++++++++++++
7 files changed, 205 insertions(+)
create mode 100644 net/dsa/tag_brcm.c
diff --git a/include/uapi/linux/if_ether.h b/include/uapi/linux/if_ether.h
index 0f8210b8e0bc..2e9f13768abd 100644
--- a/include/uapi/linux/if_ether.h
+++ b/include/uapi/linux/if_ether.h
@@ -128,6 +128,7 @@
#define ETH_P_PHONET 0x00F5 /* Nokia Phonet frames */
#define ETH_P_IEEE802154 0x00F6 /* IEEE802.15.4 frame */
#define ETH_P_CAIF 0x00F7 /* ST-Ericsson CAIF protocol */
+#define ETH_P_BRCMTAG 0x00F8 /* Broadcom tag (4 bytes *) */
/*
* This is an Ethernet frame header.
diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
index f5eede1d6cb8..a585fd6352eb 100644
--- a/net/dsa/Kconfig
+++ b/net/dsa/Kconfig
@@ -12,6 +12,9 @@ config NET_DSA
if NET_DSA
# tagging formats
+config NET_DSA_TAG_BRCM
+ bool
+
config NET_DSA_TAG_DSA
bool
diff --git a/net/dsa/Makefile b/net/dsa/Makefile
index 7b9fcbbeda5d..da06ed1df620 100644
--- a/net/dsa/Makefile
+++ b/net/dsa/Makefile
@@ -3,6 +3,7 @@ obj-$(CONFIG_NET_DSA) += dsa_core.o
dsa_core-y += dsa.o slave.o
# tagging formats
+dsa_core-$(CONFIG_NET_DSA_TAG_BRCM) += 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_TRAILER) += tag_trailer.o
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 62f2f4e67d7d..cd33ddf6ff4f 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -650,6 +650,9 @@ static int __init dsa_init_module(void)
#ifdef CONFIG_NET_DSA_TAG_TRAILER
dev_add_pack(&trailer_packet_type);
#endif
+#ifdef CONFIG_NET_DSA_TAG_BRCM
+ dev_add_pack(&brcm_tag_packet_type);
+#endif
return 0;
}
module_init(dsa_init_module);
@@ -665,6 +668,9 @@ static void __exit dsa_cleanup_module(void)
#ifdef CONFIG_NET_DSA_TAG_DSA
dev_remove_pack(&dsa_packet_type);
#endif
+#ifdef CONFIG_NET_DSA_TAG_BRCM
+ dev_remove_pack(&brcm_tag_packet_type);
+#endif
platform_driver_unregister(&dsa_driver);
}
module_exit(dsa_cleanup_module);
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index a7f6f0c5fa31..8fb71da70dd6 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -60,5 +60,9 @@ extern struct packet_type edsa_packet_type;
netdev_tx_t trailer_xmit(struct sk_buff *skb, struct net_device *dev);
extern struct packet_type trailer_packet_type;
+/* tag_brcm.c */
+netdev_tx_t brcm_tag_xmit(struct sk_buff *skb, struct net_device *dev);
+extern struct packet_type brcm_tag_packet_type;
+
#endif
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index ee019ec29dec..279728c53c91 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -295,6 +295,18 @@ static const struct ethtool_ops dsa_slave_ethtool_ops = {
.get_sset_count = dsa_slave_get_sset_count,
};
+#ifdef CONFIG_NET_DSA_TAG_BRCM
+static const struct net_device_ops brcm_netdev_ops = {
+ .ndo_init = dsa_slave_init,
+ .ndo_open = dsa_slave_open,
+ .ndo_stop = dsa_slave_close,
+ .ndo_start_xmit = brcm_tag_xmit,
+ .ndo_change_rx_flags = dsa_slave_change_rx_flags,
+ .ndo_set_rx_mode = dsa_slave_set_rx_mode,
+ .ndo_set_mac_address = dsa_slave_set_mac_address,
+ .ndo_do_ioctl = dsa_slave_ioctl,
+};
+#endif
#ifdef CONFIG_NET_DSA_TAG_DSA
static const struct net_device_ops dsa_netdev_ops = {
.ndo_init = dsa_slave_init,
@@ -474,6 +486,11 @@ dsa_slave_create(struct dsa_switch *ds, struct device *parent,
slave_dev->netdev_ops = &trailer_netdev_ops;
break;
#endif
+#ifdef CONFIG_NET_DSA_TAG_BRCM
+ case htons(ETH_P_BRCMTAG):
+ slave_dev->netdev_ops = &brcm_netdev_ops;
+ break;
+#endif
default:
slave_dev->netdev_ops = ¬ag_netdev_ops;
break;
diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c
new file mode 100644
index 000000000000..4b1c2c1896a3
--- /dev/null
+++ b/net/dsa/tag_brcm.c
@@ -0,0 +1,173 @@
+/*
+ * Broadcom tag support
+ *
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * 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 <linux/slab.h>
+#include "dsa_priv.h"
+
+/* This tag length is 4 bytes, older ones were 6 bytes, we do not
+ * handle them
+ */
+#define BRCM_TAG_LEN 4
+
+/* Tag is constructed and desconstructed using byte by byte access
+ * because the tag is placed after the MAC Source Address, which does
+ * not make it 4-bytes aligned, so this might cause unaligned accesses
+ * on most systems where this is used.
+ */
+
+/* Ingress and egress opcodes */
+#define BRCM_OPCODE_SHIFT 5
+#define BRCM_OPCODE_MASK 0x7
+
+/* Ingress fields */
+/* 1st byte in the tag */
+#define BRCM_IG_TC_SHIFT 2
+#define BRCM_IG_TC_MASK 0x7
+/* 2nd byte in the tag */
+#define BRCM_IG_TE_MASK 0x3
+#define BRCM_IG_TS_SHIFT 7
+/* 3rd byte in the tag */
+#define BRCM_IG_DSTMAP2_MASK 1
+#define BRCM_IG_DSTMAP1_MASK 0xff
+
+/* Egress fields */
+
+/* 2nd byte in the tag */
+#define BRCM_EG_CID_MASK 0xff
+
+/* 3rd byte in the tag */
+#define BRCM_EG_RC_MASK 0xff
+#define BRCM_EG_RC_RSVD (3 << 6)
+#define BRCM_EG_RC_EXCEPTION (1 << 5)
+#define BRCM_EG_RC_PROT_SNOOP (1 << 4)
+#define BRCM_EG_RC_PROT_TERM (1 << 3)
+#define BRCM_EG_RC_SWITCH (1 << 2)
+#define BRCM_EG_RC_MAC_LEARN (1 << 1)
+#define BRCM_EG_RC_MIRROR (1 << 0)
+#define BRCM_EG_TC_SHIFT 5
+#define BRCM_EG_TC_MASK 0x7
+#define BRCM_EG_PID_MASK 0x1f
+
+netdev_tx_t brcm_tag_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct dsa_slave_priv *p = netdev_priv(dev);
+ u8 *brcm_tag;
+
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += skb->len;
+
+ if (skb_cow_head(skb, BRCM_TAG_LEN) < 0)
+ goto out_free;
+
+ skb_push(skb, BRCM_TAG_LEN);
+
+ memmove(skb->data, skb->data + BRCM_TAG_LEN, 2 * ETH_ALEN);
+
+ /* Build the tag after the MAC Source Address */
+ brcm_tag = skb->data + 2 * ETH_ALEN;
+
+ /* Set the ingress opcode, traffic class, tag enforcment is
+ * deprecated
+ */
+ brcm_tag[0] = (1 << BRCM_OPCODE_SHIFT) |
+ ((skb->priority << BRCM_IG_TC_SHIFT) & BRCM_IG_TC_MASK);
+ brcm_tag[1] = 0;
+ brcm_tag[2] = 0;
+ if (p->port == 8)
+ brcm_tag[2] = BRCM_IG_DSTMAP2_MASK;
+ brcm_tag[3] = (1 << p->port) & BRCM_IG_DSTMAP1_MASK;
+
+ /* Queue the SKB for transmission on the parent interface, but
+ * do not modify its EtherType
+ */
+ skb->protocol = htons(ETH_P_BRCMTAG);
+ skb->dev = p->parent->dst->master_netdev;
+ dev_queue_xmit(skb);
+
+ return NETDEV_TX_OK;
+
+out_free:
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+static int brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev,
+ struct packet_type *pt, struct net_device *orig_dev)
+{
+ struct dsa_switch_tree *dst = dev->dsa_ptr;
+ struct dsa_switch *ds;
+ int source_port;
+ u8 *brcm_tag;
+
+ if (unlikely(dst == NULL))
+ goto out_drop;
+
+ ds = dst->ds[0];
+
+ skb = skb_unshare(skb, GFP_ATOMIC);
+ if (skb == NULL)
+ goto out;
+
+ if (unlikely(!pskb_may_pull(skb, BRCM_TAG_LEN)))
+ goto out_drop;
+
+ /* skb->data points to the EtherType, the tag is right before it */
+ brcm_tag = skb->data - 2;
+
+ /* The opcode should never be different than 0b000 */
+ if (unlikely((brcm_tag[0] >> BRCM_OPCODE_SHIFT) & BRCM_OPCODE_MASK))
+ goto out_drop;
+
+ /* We should never see a reserved reason code without knowing how to
+ * handle it
+ */
+ WARN_ON(brcm_tag[2] & BRCM_EG_RC_RSVD);
+
+ /* Locate which port this is coming from */
+ source_port = brcm_tag[3] & BRCM_EG_PID_MASK;
+
+ /* Validate port against switch setup, either the port is totally */
+ if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL)
+ goto out_drop;
+
+ /* Remove Broadcom tag and update checksum */
+ skb_pull_rcsum(skb, BRCM_TAG_LEN);
+
+ /* Move the Ethernet DA and SA */
+ memmove(skb->data - ETH_HLEN,
+ skb->data - ETH_HLEN - BRCM_TAG_LEN,
+ 2 * ETH_ALEN);
+
+ skb_push(skb, ETH_HLEN);
+ skb->pkt_type = PACKET_HOST;
+ skb->dev = ds->ports[source_port];
+ skb->protocol = eth_type_trans(skb, skb->dev);
+
+ 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;
+}
+
+struct packet_type brcm_tag_packet_type __read_mostly = {
+ .type = cpu_to_be16(ETH_P_BRCMTAG),
+ .func = brcm_tag_rcv,
+};
--
1.9.1
--
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