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Message-Id: <20181215005806.3856-3-marex@denx.de>
Date: Sat, 15 Dec 2018 01:58:05 +0100
From: Marek Vasut <marex@...x.de>
To: netdev@...r.kernel.org
Cc: f.fainelli@...il.com, andrew@...n.ch,
Tristram Ha <Tristram.Ha@...rochip.com>,
Marek Vasut <marex@...x.de>,
Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
Woojung Huh <woojung.huh@...rochip.com>,
"David S . Miller" <davem@...emloft.net>
Subject: [PATCH V3 2/3] 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>
--
V2: - Rebase on next/master
- Redo the code refactoring again, this by pulling out common pieces
of the xmit, receive functions, to avoid function calls through
pointers.
V3: - Check return value of ksz_common_xmit()
---
net/dsa/tag_ksz.c | 112 ++++++++++++++++++++++++++++++----------------
1 file changed, 73 insertions(+), 39 deletions(-)
diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
index c24a333e55bd..c98b53f691bd 100644
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -14,34 +14,18 @@
#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)
- */
+/* Typically only one byte is used for tail tag. */
+#define KSZ_EGRESS_TAG_LEN 1
-#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)
+static struct sk_buff *ksz_common_xmit(struct sk_buff *skb,
+ struct net_device *dev, int len)
{
- struct dsa_port *dp = dsa_slave_to_port(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) {
+ 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 +33,7 @@ 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 +54,84 @@ 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 */
-
return nskb;
}
-static struct sk_buff *ksz_rcv(struct sk_buff *skb, struct net_device *dev,
- struct packet_type *pt)
+static struct sk_buff *ksz_common_rcv(struct sk_buff *skb,
+ struct net_device *dev,
+ unsigned int port, unsigned int len)
{
- u8 *tag;
- int source_port;
+ skb->dev = dsa_master_find_slave(dev, 0, port);
+ if (!skb->dev)
+ return NULL;
- tag = skb_tail_pointer(skb) - KSZ_EGRESS_TAG_LEN;
+ pskb_trim_rcsum(skb, skb->len - len);
- source_port = tag[0] & 7;
+ return skb;
+}
- skb->dev = dsa_master_find_slave(dev, 0, source_port);
- if (!skb->dev)
+/*
+ * 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 struct sk_buff *ksz9477_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct dsa_port *dp = dsa_slave_to_port(dev);
+ struct sk_buff *nskb;
+ u16 *tag;
+ u8 *addr;
+
+ nskb = ksz_common_xmit(skb, dev, KSZ9477_INGRESS_TAG_LEN);
+ if (!nskb)
return NULL;
- pskb_trim_rcsum(skb, skb->len - KSZ_EGRESS_TAG_LEN);
+ /* Tag encoding */
+ tag = skb_put(nskb, KSZ9477_INGRESS_TAG_LEN);
+ addr = skb_mac_header(nskb);
- return skb;
+ *tag = BIT(dp->index);
+ *tag = cpu_to_be16(*tag);
+
+ return nskb;
+}
+
+static struct sk_buff *ksz9477_rcv(struct sk_buff *skb, struct net_device *dev,
+ struct packet_type *pt)
+{
+ /* Tag decoding */
+ u8 *tag = skb_tail_pointer(skb) - KSZ_EGRESS_TAG_LEN;
+ unsigned int port = tag[0] & 7;
+ unsigned int len = KSZ_EGRESS_TAG_LEN;
+
+ /* Extra 4-bytes PTP timestamp */
+ if (tag[0] & KSZ9477_PTP_TAG_INDICATION)
+ len += KSZ9477_PTP_TAG_LEN;
+
+ return ksz_common_rcv(skb, dev, port, len);
}
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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