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authorWoojung Huh2017-05-31 20:19:06 +0000
committerDavid S. Miller2017-05-31 20:56:31 -0400
commit8b8010fb7876e816300ddd60fa089e9ceb209f3e (patch)
treed872f6691574c44a152aa4a01a382091b7451db1 /net
parent6c21a2a65ded27ce49847339efe4e1373a2319e5 (diff)
dsa: add support for Microchip KSZ tail tagging
Adding support for the Microchip KSZ switch family tail tagging. Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Woojung Huh <Woojung.Huh@microchip.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/dsa/Kconfig3
-rw-r--r--net/dsa/Makefile1
-rw-r--r--net/dsa/dsa.c3
-rw-r--r--net/dsa/dsa_priv.h3
-rw-r--r--net/dsa/tag_ksz.c101
5 files changed, 111 insertions, 0 deletions
diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
index 297389b2ab35..cc5f8f971689 100644
--- a/net/dsa/Kconfig
+++ b/net/dsa/Kconfig
@@ -25,6 +25,9 @@ config NET_DSA_TAG_DSA
config NET_DSA_TAG_EDSA
bool
+config NET_DSA_TAG_KSZ
+ bool
+
config NET_DSA_TAG_LAN9303
bool
diff --git a/net/dsa/Makefile b/net/dsa/Makefile
index 90e5aa6f7d0f..fcce25da937c 100644
--- a/net/dsa/Makefile
+++ b/net/dsa/Makefile
@@ -6,6 +6,7 @@ dsa_core-y += dsa.o dsa2.o legacy.o port.o slave.o switch.o
dsa_core-$(CONFIG_NET_DSA_TAG_BRCM) += tag_brcm.o
dsa_core-$(CONFIG_NET_DSA_TAG_DSA) += tag_dsa.o
dsa_core-$(CONFIG_NET_DSA_TAG_EDSA) += tag_edsa.o
+dsa_core-$(CONFIG_NET_DSA_TAG_KSZ) += tag_ksz.o
dsa_core-$(CONFIG_NET_DSA_TAG_LAN9303) += tag_lan9303.o
dsa_core-$(CONFIG_NET_DSA_TAG_MTK) += tag_mtk.o
dsa_core-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 3288a80d4d6c..402459e73f33 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -49,6 +49,9 @@ const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
#ifdef CONFIG_NET_DSA_TAG_EDSA
[DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
#endif
+#ifdef CONFIG_NET_DSA_TAG_KSZ
+ [DSA_TAG_PROTO_KSZ] = &ksz_netdev_ops,
+#endif
#ifdef CONFIG_NET_DSA_TAG_LAN9303
[DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops,
#endif
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index c1d4180651af..7459d5735d8b 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -167,6 +167,9 @@ extern const struct dsa_device_ops dsa_netdev_ops;
/* tag_edsa.c */
extern const struct dsa_device_ops edsa_netdev_ops;
+/* tag_ksz.c */
+extern const struct dsa_device_ops ksz_netdev_ops;
+
/* tag_lan9303.c */
extern const struct dsa_device_ops lan9303_netdev_ops;
diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
new file mode 100644
index 000000000000..0b08a40b493a
--- /dev/null
+++ b/net/dsa/tag_ksz.c
@@ -0,0 +1,101 @@
+/*
+ * 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)
+ */
+
+#define KSZ_INGRESS_TAG_LEN 2
+#define KSZ_EGRESS_TAG_LEN 1
+
+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 = (skb->len >= ETH_ZLEN) ? 0 : ETH_ZLEN - skb->len;
+
+ if (skb_tailroom(skb) >= padlen + KSZ_INGRESS_TAG_LEN) {
+ nskb = skb;
+ } else {
+ nskb = alloc_skb(NET_IP_ALIGN + skb->len +
+ padlen + KSZ_INGRESS_TAG_LEN, 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);
+ }
+
+ /* skb is freed when it fails */
+ if (skb_put_padto(nskb, nskb->len + padlen))
+ return NULL;
+
+ tag = skb_put(nskb, KSZ_INGRESS_TAG_LEN);
+ tag[0] = 0;
+ tag[1] = 1 << p->dp->index; /* destination 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_dp->ds;
+
+ tag = skb_tail_pointer(skb) - KSZ_EGRESS_TAG_LEN;
+
+ source_port = tag[0] & 7;
+ if (source_port >= ds->num_ports || !ds->ports[source_port].netdev)
+ return NULL;
+
+ pskb_trim_rcsum(skb, skb->len - KSZ_EGRESS_TAG_LEN);
+
+ skb->dev = ds->ports[source_port].netdev;
+
+ return skb;
+}
+
+const struct dsa_device_ops ksz_netdev_ops = {
+ .xmit = ksz_xmit,
+ .rcv = ksz_rcv,
+};