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Date: Fri, 7 Dec 2018 19:18:43 +0100
From: Marek Vasut <marex@...x.de>
To: netdev@...r.kernel.org
Cc: f.fainelli@...il.com, vivien.didelot@...oirfairelinux.com,
andrew@...n.ch, Woojung.Huh@...rochip.com,
UNGLinuxDriver@...rochip.com,
Tristram Ha <Tristram.Ha@...rochip.com>,
Marek Vasut <marex@...x.de>,
Woojung Huh <woojung.huh@...rochip.com>,
"David S . Miller" <davem@...emloft.net>
Subject: [PATCH 3/5] net: dsa: ksz: Factor out common tag code
From: Tristram Ha <Tristram.Ha@...rochip.com>
Factor out common code from the tag_ksz , so that the code can be used
with other KSZ family switches which use differenly sized tags.
Signed-off-by: Tristram Ha <Tristram.Ha@...rochip.com>
Signed-off-by: Marek Vasut <marex@...x.de>
Cc: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc: Woojung Huh <woojung.huh@...rochip.com>
Cc: David S. Miller <davem@...emloft.net>
---
net/dsa/tag_ksz.c | 125 +++++++++++++++++++++++++++++++++-------------
1 file changed, 90 insertions(+), 35 deletions(-)
diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
index 036bc62198f28..d94bad1ab7e53 100644
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -14,34 +14,30 @@
#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)
- */
+struct ksz_tag_ops {
+ void (*get_tag)(u8 *tag, unsigned int *port, unsigned int *len);
+ void (*set_tag)(struct sk_buff *skb, struct net_device *dev);
+};
-#define KSZ_INGRESS_TAG_LEN 2
-#define KSZ_EGRESS_TAG_LEN 1
+/* Typically only one byte is used for tail tag. */
+#define KSZ_EGRESS_TAG_LEN 1
-static struct sk_buff *ksz_xmit(struct sk_buff *skb, struct net_device *dev)
+/* Frames with following addresse may need to be sent even when the port is
+ * closed.
+ */
+static const u8 special_mult_addr[] = {
+ 0x01, 0x80, 0xC2, 0x00, 0x00, 0x00
+};
+
+static struct sk_buff *ksz_xmit(struct sk_buff *skb, struct net_device *dev,
+ struct ksz_tag_ops *ops, int len)
{
- struct dsa_port *dp = dsa_slave_to_port(dev);
struct sk_buff *nskb;
int padlen;
- u8 *tag;
padlen = (skb->len >= VLAN_ETH_ZLEN) ? 0 : VLAN_ETH_ZLEN - skb->len;
- if (skb_tailroom(skb) >= padlen + KSZ_INGRESS_TAG_LEN) {
+ if (skb_tailroom(skb) >= padlen + len) {
/* Let dsa_slave_xmit() free skb */
if (__skb_put_padto(skb, skb->len + padlen, false))
return NULL;
@@ -49,7 +45,7 @@ static struct sk_buff *ksz_xmit(struct sk_buff *skb, struct net_device *dev)
nskb = skb;
} else {
nskb = alloc_skb(NET_IP_ALIGN + skb->len +
- padlen + KSZ_INGRESS_TAG_LEN, GFP_ATOMIC);
+ padlen + len, GFP_ATOMIC);
if (!nskb)
return NULL;
skb_reserve(nskb, NET_IP_ALIGN);
@@ -70,34 +66,93 @@ static struct sk_buff *ksz_xmit(struct sk_buff *skb, struct net_device *dev)
consume_skb(skb);
}
- tag = skb_put(nskb, KSZ_INGRESS_TAG_LEN);
- tag[0] = 0;
- tag[1] = 1 << dp->index; /* destination port */
+ ops->set_tag(nskb, dev);
return nskb;
}
static struct sk_buff *ksz_rcv(struct sk_buff *skb, struct net_device *dev,
- struct packet_type *pt)
+ struct packet_type *pt, struct ksz_tag_ops *ops)
{
- u8 *tag;
- int source_port;
+ int sp, len;
+ u8 *tag = skb_tail_pointer(skb) - KSZ_EGRESS_TAG_LEN;
- tag = skb_tail_pointer(skb) - KSZ_EGRESS_TAG_LEN;
+ ops->get_tag(tag, &sp, &len);
- source_port = tag[0] & 7;
-
- skb->dev = dsa_master_find_slave(dev, 0, source_port);
+ skb->dev = dsa_master_find_slave(dev, 0, sp);
if (!skb->dev)
return NULL;
- pskb_trim_rcsum(skb, skb->len - KSZ_EGRESS_TAG_LEN);
+ pskb_trim_rcsum(skb, skb->len - len);
return skb;
}
+/*
+ * For Ingress (Host -> KSZ9477), 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 (KSZ9477 -> 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 KSZ9477_INGRESS_TAG_LEN 2
+#define KSZ9477_PTP_TAG_LEN 4
+#define KSZ9477_PTP_TAG_INDICATION 0x80
+
+#define KSZ9477_TAIL_TAG_OVERRIDE BIT(9)
+#define KSZ9477_TAIL_TAG_LOOKUP BIT(10)
+
+static void ksz9477_get_tag(u8 *tag, unsigned int *port, unsigned int *len)
+{
+ *port = tag[0] & 7;
+ *len = KSZ_EGRESS_TAG_LEN;
+
+ /* Extra 4-bytes PTP timestamp */
+ if (tag[0] & KSZ9477_PTP_TAG_INDICATION)
+ *len += KSZ9477_PTP_TAG_LEN;
+}
+
+static void ksz9477_set_tag(struct sk_buff *skb, struct net_device *dev)
+{
+ struct dsa_port *dp = dsa_slave_to_port(dev);
+ u16 *tag = skb_put(skb, KSZ9477_INGRESS_TAG_LEN);
+ u8 *addr = skb_mac_header(skb);
+
+ *tag = 1 << dp->index;
+ if (!memcmp(addr, special_mult_addr, ETH_ALEN))
+ *tag |= KSZ9477_TAIL_TAG_OVERRIDE;
+
+ *tag = cpu_to_be16(*tag);
+}
+
+static struct ksz_tag_ops ksz9477_tag_ops = {
+ .get_tag = ksz9477_get_tag,
+ .set_tag = ksz9477_set_tag,
+};
+
+static struct sk_buff *ksz9477_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ return ksz_xmit(skb, dev, &ksz9477_tag_ops, KSZ9477_INGRESS_TAG_LEN);
+}
+
+static struct sk_buff *ksz9477_rcv(struct sk_buff *skb, struct net_device *dev,
+ struct packet_type *pt)
+{
+ return ksz_rcv(skb, dev, pt, &ksz9477_tag_ops);
+}
+
const struct dsa_device_ops ksz9477_netdev_ops = {
- .xmit = ksz_xmit,
- .rcv = ksz_rcv,
- .overhead = KSZ_INGRESS_TAG_LEN,
+ .xmit = ksz9477_xmit,
+ .rcv = ksz9477_rcv,
+ .overhead = KSZ9477_INGRESS_TAG_LEN,
};
--
2.18.0
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