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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * net/dsa/tag_ksz.c - Microchip KSZ Switch tag format handling
- * Copyright (c) 2017 Microchip Technology
- */
- #include <linux/etherdevice.h>
- #include <linux/list.h>
- #include <linux/slab.h>
- #include <net/dsa.h>
- #include "dsa_priv.h"
- /* Typically only one byte is used for tail tag. */
- #define KSZ_EGRESS_TAG_LEN 1
- #define KSZ_INGRESS_TAG_LEN 1
- static struct sk_buff *ksz_common_rcv(struct sk_buff *skb,
- struct net_device *dev,
- unsigned int port, unsigned int len)
- {
- skb->dev = dsa_master_find_slave(dev, 0, port);
- if (!skb->dev)
- return NULL;
- pskb_trim_rcsum(skb, skb->len - len);
- skb->offload_fwd_mark = true;
- return skb;
- }
- /*
- * For Ingress (Host -> KSZ8795), 1 byte is added before FCS.
- * ---------------------------------------------------------------------------
- * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag(1byte)|FCS(4bytes)
- * ---------------------------------------------------------------------------
- * tag : each bit represents port (eg, 0x01=port1, 0x02=port2, 0x10=port5)
- *
- * For Egress (KSZ8795 -> 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 KSZ8795_TAIL_TAG_OVERRIDE BIT(6)
- #define KSZ8795_TAIL_TAG_LOOKUP BIT(7)
- static struct sk_buff *ksz8795_xmit(struct sk_buff *skb, struct net_device *dev)
- {
- struct dsa_port *dp = dsa_slave_to_port(dev);
- u8 *tag;
- u8 *addr;
- /* Tag encoding */
- tag = skb_put(skb, KSZ_INGRESS_TAG_LEN);
- addr = skb_mac_header(skb);
- *tag = 1 << dp->index;
- if (is_link_local_ether_addr(addr))
- *tag |= KSZ8795_TAIL_TAG_OVERRIDE;
- return skb;
- }
- static struct sk_buff *ksz8795_rcv(struct sk_buff *skb, struct net_device *dev,
- struct packet_type *pt)
- {
- u8 *tag = skb_tail_pointer(skb) - KSZ_EGRESS_TAG_LEN;
- return ksz_common_rcv(skb, dev, tag[0] & 7, KSZ_EGRESS_TAG_LEN);
- }
- static const struct dsa_device_ops ksz8795_netdev_ops = {
- .name = "ksz8795",
- .proto = DSA_TAG_PROTO_KSZ8795,
- .xmit = ksz8795_xmit,
- .rcv = ksz8795_rcv,
- .overhead = KSZ_INGRESS_TAG_LEN,
- .tail_tag = true,
- };
- DSA_TAG_DRIVER(ksz8795_netdev_ops);
- MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ8795);
- /*
- * 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);
- __be16 *tag;
- u8 *addr;
- u16 val;
- /* Tag encoding */
- tag = skb_put(skb, KSZ9477_INGRESS_TAG_LEN);
- addr = skb_mac_header(skb);
- val = BIT(dp->index);
- if (is_link_local_ether_addr(addr))
- val |= KSZ9477_TAIL_TAG_OVERRIDE;
- *tag = cpu_to_be16(val);
- return skb;
- }
- 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);
- }
- static const struct dsa_device_ops ksz9477_netdev_ops = {
- .name = "ksz9477",
- .proto = DSA_TAG_PROTO_KSZ9477,
- .xmit = ksz9477_xmit,
- .rcv = ksz9477_rcv,
- .overhead = KSZ9477_INGRESS_TAG_LEN,
- .tail_tag = true,
- };
- DSA_TAG_DRIVER(ksz9477_netdev_ops);
- MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9477);
- #define KSZ9893_TAIL_TAG_OVERRIDE BIT(5)
- #define KSZ9893_TAIL_TAG_LOOKUP BIT(6)
- static struct sk_buff *ksz9893_xmit(struct sk_buff *skb,
- struct net_device *dev)
- {
- struct dsa_port *dp = dsa_slave_to_port(dev);
- u8 *addr;
- u8 *tag;
- /* Tag encoding */
- tag = skb_put(skb, KSZ_INGRESS_TAG_LEN);
- addr = skb_mac_header(skb);
- *tag = BIT(dp->index);
- if (is_link_local_ether_addr(addr))
- *tag |= KSZ9893_TAIL_TAG_OVERRIDE;
- return skb;
- }
- static const struct dsa_device_ops ksz9893_netdev_ops = {
- .name = "ksz9893",
- .proto = DSA_TAG_PROTO_KSZ9893,
- .xmit = ksz9893_xmit,
- .rcv = ksz9477_rcv,
- .overhead = KSZ_INGRESS_TAG_LEN,
- .tail_tag = true,
- };
- DSA_TAG_DRIVER(ksz9893_netdev_ops);
- MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9893);
- static struct dsa_tag_driver *dsa_tag_driver_array[] = {
- &DSA_TAG_DRIVER_NAME(ksz8795_netdev_ops),
- &DSA_TAG_DRIVER_NAME(ksz9477_netdev_ops),
- &DSA_TAG_DRIVER_NAME(ksz9893_netdev_ops),
- };
- module_dsa_tag_drivers(dsa_tag_driver_array);
- MODULE_LICENSE("GPL");
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