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Date: Fri, 5 May 2017 23:17:47 +0000
From: <Woojung.Huh@...rochip.com>
To: <andrew@...n.ch>, <f.fainelli@...il.com>,
<vivien.didelot@...oirfairelinux.com>
CC: <netdev@...r.kernel.org>, <davem@...emloft.net>,
<UNGLinuxDriver@...rochip.com>
Subject: [PATCH net-next 1/5] dsa: add support for Microchip KSZ tail tagging
From: Woojung Huh <Woojung.Huh@...rochip.com>
Adding support for the Microchip KSZ switch family tail tagging.
Signed-off-by: Woojung Huh <Woojung.Huh@...rochip.com>
---
include/net/dsa.h | 1 +
net/dsa/Kconfig | 3 ++
net/dsa/Makefile | 1 +
net/dsa/dsa.c | 3 ++
net/dsa/dsa_priv.h | 3 ++
net/dsa/tag_ksz.c | 98 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
6 files changed, 109 insertions(+)
create mode 100644 net/dsa/tag_ksz.c
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 8e24677..c92204a 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -34,6 +34,7 @@ enum dsa_tag_protocol {
DSA_TAG_PROTO_QCA,
DSA_TAG_PROTO_MTK,
DSA_TAG_PROTO_LAN9303,
+ DSA_TAG_PROTO_KSZ,
DSA_TAG_LAST, /* MUST BE LAST */
};
diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
index 81a0868..ce31428 100644
--- a/net/dsa/Kconfig
+++ b/net/dsa/Kconfig
@@ -37,4 +37,7 @@ config NET_DSA_TAG_MTK
config NET_DSA_TAG_LAN9303
bool
+config NET_DSA_TAG_KSZ
+ bool
+
endif
diff --git a/net/dsa/Makefile b/net/dsa/Makefile
index 0b747d7..8becb26 100644
--- a/net/dsa/Makefile
+++ b/net/dsa/Makefile
@@ -10,3 +10,4 @@ dsa_core-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o
dsa_core-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o
dsa_core-$(CONFIG_NET_DSA_TAG_MTK) += tag_mtk.o
dsa_core-$(CONFIG_NET_DSA_TAG_LAN9303) += tag_lan9303.o
+dsa_core-$(CONFIG_NET_DSA_TAG_KSZ) += tag_ksz.o
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 26130ae..6340323 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -61,6 +61,9 @@ const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
#ifdef CONFIG_NET_DSA_TAG_LAN9303
[DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops,
#endif
+#ifdef CONFIG_NET_DSA_TAG_KSZ
+ [DSA_TAG_PROTO_KSZ] = &ksz_netdev_ops,
+#endif
[DSA_TAG_PROTO_NONE] = &none_ops,
};
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index f4a88e4..70183ac 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -96,4 +96,7 @@ extern const struct dsa_device_ops mtk_netdev_ops;
/* tag_lan9303.c */
extern const struct dsa_device_ops lan9303_netdev_ops;
+/* tag_ksz.c */
+extern const struct dsa_device_ops ksz_netdev_ops;
+
#endif
diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
new file mode 100644
index 0000000..270bfb9
--- /dev/null
+++ b/net/dsa/tag_ksz.c
@@ -0,0 +1,98 @@
+/*
+ * net/dsa/tag_ksz.c - Microchip KSZ Switch tag format handling
+ * Copyright (c) 2017 Microchip Technology
+ *
+ * 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/slab.h>
+#include <net/dsa.h>
+#include "dsa_priv.h"
+
+/* For Ingress (Host -> KSZ), 2 bytes are added before FCS.
+ * ---------------------------------------------------------------------------
+ * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|tag1(1byte)|FCS(4bytes)
+ * ---------------------------------------------------------------------------
+ * tag0 : Prioritization (not used now)
+ * tag1 : each bit represents port (eg, 0x01=port1, 0x02=port2, 0x10=port5)
+ *
+ * For Egress (KSZ -> Host), 1 byte is added before FCS.
+ * ---------------------------------------------------------------------------
+ * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|FCS(4bytes)
+ * ---------------------------------------------------------------------------
+ * tag0 : zero-based value represents port
+ * (eg, 0x00=port1, 0x02=port3, 0x06=port7)
+ */
+
+static struct sk_buff *ksz_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct dsa_slave_priv *p = netdev_priv(dev);
+ struct sk_buff *nskb;
+ int padlen;
+ u8 *tag;
+
+ padlen = 0;
+ if (skb->len < 60)
+ padlen = 60 - skb->len;
+
+ nskb = alloc_skb(NET_IP_ALIGN + skb->len + padlen + 2, GFP_ATOMIC);
+ if (!nskb) {
+ kfree_skb(skb);
+ return NULL;
+ }
+ 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);
+ }
+
+ tag = skb_put(nskb, 2);
+ tag[0] = 0;
+ tag[1] = 1 << p->dp->index; /* destnation port */
+
+ return nskb;
+}
+
+struct sk_buff *ksz_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 *tag;
+ int source_port;
+
+ ds = dst->cpu_switch;
+
+ if (skb_linearize(skb))
+ return NULL;
+
+ tag = skb_tail_pointer(skb) - 1;
+
+ source_port = tag[0] & 7;
+ if (source_port >= ds->num_ports || !ds->ports[source_port].netdev)
+ return NULL;
+
+ pskb_trim_rcsum(skb, skb->len - 1);
+
+ skb->dev = ds->ports[source_port].netdev;
+
+ return skb;
+}
+
+const struct dsa_device_ops ksz_netdev_ops = {
+ .xmit = ksz_xmit,
+ .rcv = ksz_rcv,
+};
--
2.7.4
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