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Subject[PATCH 4/7] net: dsa: add QCA tag support
Date
QCA tags are used on QCA ar8xxx switch family. This change adds support
for encap/decap using 2 bytes header mode.

Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>
---
include/net/dsa.h | 1 +
net/dsa/Kconfig | 3 +
net/dsa/Makefile | 1 +
net/dsa/dsa.c | 5 ++
net/dsa/dsa_priv.h | 2 +
net/dsa/slave.c | 5 ++
net/dsa/tag_qca.c | 158 +++++++++++++++++++++++++++++++++++++++++++++++++++++
7 files changed, 175 insertions(+)
create mode 100644 net/dsa/tag_qca.c

diff --git a/include/net/dsa.h b/include/net/dsa.h
index fbca63b..64ddf6f 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -26,6 +26,7 @@ enum dsa_tag_protocol {
DSA_TAG_PROTO_TRAILER,
DSA_TAG_PROTO_EDSA,
DSA_TAG_PROTO_BRCM,
+ DSA_TAG_PROTO_QCA,
};

#define DSA_MAX_SWITCHES 4
diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
index ff7736f..4f3cce1 100644
--- a/net/dsa/Kconfig
+++ b/net/dsa/Kconfig
@@ -26,6 +26,9 @@ config NET_DSA_HWMON
via the hwmon sysfs interface and exposes the onboard sensors.

# tagging formats
+config NET_DSA_TAG_QCA
+ bool
+
config NET_DSA_TAG_BRCM
bool

diff --git a/net/dsa/Makefile b/net/dsa/Makefile
index da06ed1..9feb86c 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-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o
dsa_core-$(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
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index fffb9aa..6010a7d 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -249,6 +249,11 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
dst->rcv = brcm_netdev_ops.rcv;
break;
#endif
+#ifdef CONFIG_NET_DSA_TAG_QCA
+ case DSA_TAG_PROTO_QCA:
+ dst->rcv = qca_netdev_ops.rcv;
+ break;
+#endif
case DSA_TAG_PROTO_NONE:
break;
default:
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index d5f1f9b..350c94b 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -74,5 +74,7 @@ extern const struct dsa_device_ops trailer_netdev_ops;
/* tag_brcm.c */
extern const struct dsa_device_ops brcm_netdev_ops;

+/* tag_qca.c */
+extern const struct dsa_device_ops qca_netdev_ops;

#endif
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 04ffad3..cd8f552 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -925,6 +925,11 @@ int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
p->xmit = brcm_netdev_ops.xmit;
break;
#endif
+#ifdef CONFIG_NET_DSA_TAG_QCA
+ case DSA_TAG_PROTO_QCA:
+ p->xmit = qca_netdev_ops.xmit;
+ break;
+#endif
default:
p->xmit = dsa_slave_notag_xmit;
break;
diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c
new file mode 100644
index 0000000..8f02196
--- /dev/null
+++ b/net/dsa/tag_qca.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/etherdevice.h>
+#include "dsa_priv.h"
+
+#define QCA_HDR_LEN 2
+#define QCA_HDR_VERSION 0x2
+
+#define QCA_HDR_RECV_VERSION_MASK GENMASK(15, 14)
+#define QCA_HDR_RECV_VERSION_S 14
+#define QCA_HDR_RECV_PRIORITY_MASK GENMASK(13, 11)
+#define QCA_HDR_RECV_PRIORITY_S 11
+#define QCA_HDR_RECV_TYPE_MASK GENMASK(10, 6)
+#define QCA_HDR_RECV_TYPE_S 6
+#define QCA_HDR_RECV_FRAME_IS_TAGGED BIT(3)
+#define QCA_HDR_RECV_SOURCE_PORT_MASK GENMASK(2, 0)
+
+#define QCA_HDR_XMIT_VERSION_MASK GENMASK(15, 14)
+#define QCA_HDR_XMIT_VERSION_S 14
+#define QCA_HDR_XMIT_PRIORITY_MASK GENMASK(13, 11)
+#define QCA_HDR_XMIT_PRIORITY_S 11
+#define QCA_HDR_XMIT_CONTROL_MASK GENMASK(10, 8)
+#define QCA_HDR_XMIT_CONTROL_S 8
+#define QCA_HDR_XMIT_FROM_CPU BIT(7)
+#define QCA_HDR_XMIT_DP_BIT_MASK GENMASK(6, 0)
+
+static inline int reg_to_port(int reg)
+{
+ if (reg < 5)
+ return reg + 1;
+
+ return -1;
+}
+
+static inline int port_to_reg(int port)
+{
+ if (port >= 1 && port <= 6)
+ return port - 1;
+
+ return -1;
+}
+
+static netdev_tx_t qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct dsa_slave_priv *p = netdev_priv(dev);
+ u16 *phdr, hdr;
+
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += skb->len;
+
+ if (skb_cow_head(skb, 0) < 0)
+ goto out_free;
+
+ skb_push(skb, QCA_HDR_LEN);
+
+ memmove(skb->data, skb->data + QCA_HDR_LEN, 2 * ETH_ALEN);
+ phdr = (u16 *)(skb->data + 2 * ETH_ALEN);
+
+ /* Set the version field, and set destination port information */
+ hdr = QCA_HDR_VERSION << QCA_HDR_XMIT_VERSION_S |
+ QCA_HDR_XMIT_FROM_CPU |
+ 1 << reg_to_port(p->port);
+
+ *phdr = htons(hdr);
+
+ 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 qca_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;
+ u8 ver;
+ int port, phy;
+ __be16 *phdr, hdr;
+
+ if (unlikely(!dst))
+ goto out_drop;
+
+ skb = skb_unshare(skb, GFP_ATOMIC);
+ if (!skb)
+ goto out;
+
+ if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
+ goto out_drop;
+
+ /* Ethernet is added by the switch between src addr and Ethertype
+ * At this point, skb->data points to ethertype so header should be
+ * right before
+ */
+ phdr = (__be16 *)(skb->data - 2);
+ hdr = ntohs(*phdr);
+
+ /* Make sure the version is correct */
+ ver = (hdr & QCA_HDR_RECV_VERSION_MASK) >> QCA_HDR_RECV_VERSION_S;
+ if (unlikely(ver != QCA_HDR_VERSION))
+ goto out_drop;
+
+ /* Remove QCA tag and recalculate checksum */
+ skb_pull_rcsum(skb, QCA_HDR_LEN);
+ memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - QCA_HDR_LEN,
+ ETH_HLEN - QCA_HDR_LEN);
+
+ /* This protocol doesn't support cascading multiple switches so it's
+ * safe to assume the switch is first in the tree
+ */
+ ds = dst->ds[0];
+ if (!ds)
+ goto out_drop;
+
+ /* Get source port information */
+ port = (hdr & QCA_HDR_RECV_SOURCE_PORT_MASK);
+ phy = port_to_reg(port);
+ if (unlikely(phy < 0) || !ds->ports[phy])
+ goto out_drop;
+
+ /* Update skb & forward the frame accordingly */
+ skb_push(skb, ETH_HLEN);
+ skb->pkt_type = PACKET_HOST;
+ skb->dev = ds->ports[phy];
+ 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;
+}
+
+const struct dsa_device_ops qca_netdev_ops = {
+ .xmit = qca_tag_xmit,
+ .rcv = qca_tag_rcv,
+};
--
2.1.4


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