// SPDX-License-Identifier: GPL-2.0+
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/*
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* net/dsa/tag_ksz.c - Microchip KSZ Switch tag format handling
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* Copyright (c) 2017 Microchip Technology
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*/
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#include <linux/etherdevice.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <net/dsa.h>
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#include "dsa_priv.h"
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/* Typically only one byte is used for tail tag. */
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#define KSZ_EGRESS_TAG_LEN 1
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#define KSZ_INGRESS_TAG_LEN 1
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static struct sk_buff *ksz_common_rcv(struct sk_buff *skb,
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struct net_device *dev,
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unsigned int port, unsigned int len)
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{
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skb->dev = dsa_master_find_slave(dev, 0, port);
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if (!skb->dev)
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return NULL;
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if (pskb_trim_rcsum(skb, skb->len - len))
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return NULL;
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skb->offload_fwd_mark = true;
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return skb;
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}
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/*
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* For Ingress (Host -> KSZ8795), 1 byte is added before FCS.
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* ---------------------------------------------------------------------------
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* DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag(1byte)|FCS(4bytes)
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* ---------------------------------------------------------------------------
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* tag : each bit represents port (eg, 0x01=port1, 0x02=port2, 0x10=port5)
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*
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* For Egress (KSZ8795 -> Host), 1 byte is added before FCS.
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* ---------------------------------------------------------------------------
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* DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|FCS(4bytes)
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* ---------------------------------------------------------------------------
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* tag0 : zero-based value represents port
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* (eg, 0x00=port1, 0x02=port3, 0x06=port7)
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*/
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#define KSZ8795_TAIL_TAG_OVERRIDE BIT(6)
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#define KSZ8795_TAIL_TAG_LOOKUP BIT(7)
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static struct sk_buff *ksz8795_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct dsa_port *dp = dsa_slave_to_port(dev);
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u8 *tag;
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u8 *addr;
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/* Tag encoding */
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tag = skb_put(skb, KSZ_INGRESS_TAG_LEN);
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addr = skb_mac_header(skb);
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*tag = 1 << dp->index;
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if (is_link_local_ether_addr(addr))
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*tag |= KSZ8795_TAIL_TAG_OVERRIDE;
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return skb;
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}
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static struct sk_buff *ksz8795_rcv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt)
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{
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u8 *tag = skb_tail_pointer(skb) - KSZ_EGRESS_TAG_LEN;
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return ksz_common_rcv(skb, dev, tag[0] & 7, KSZ_EGRESS_TAG_LEN);
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}
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static const struct dsa_device_ops ksz8795_netdev_ops = {
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.name = "ksz8795",
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.proto = DSA_TAG_PROTO_KSZ8795,
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.xmit = ksz8795_xmit,
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.rcv = ksz8795_rcv,
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.overhead = KSZ_INGRESS_TAG_LEN,
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.tail_tag = true,
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};
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DSA_TAG_DRIVER(ksz8795_netdev_ops);
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MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ8795);
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/*
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* For Ingress (Host -> KSZ9477), 2 bytes are added before FCS.
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* ---------------------------------------------------------------------------
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* DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|tag1(1byte)|FCS(4bytes)
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* ---------------------------------------------------------------------------
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* tag0 : Prioritization (not used now)
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* tag1 : each bit represents port (eg, 0x01=port1, 0x02=port2, 0x10=port5)
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*
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* For Egress (KSZ9477 -> Host), 1 byte is added before FCS.
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* ---------------------------------------------------------------------------
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* DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|FCS(4bytes)
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* ---------------------------------------------------------------------------
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* tag0 : zero-based value represents port
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* (eg, 0x00=port1, 0x02=port3, 0x06=port7)
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*/
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#define KSZ9477_INGRESS_TAG_LEN 2
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#define KSZ9477_PTP_TAG_LEN 4
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#define KSZ9477_PTP_TAG_INDICATION 0x80
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#define KSZ9477_TAIL_TAG_OVERRIDE BIT(9)
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#define KSZ9477_TAIL_TAG_LOOKUP BIT(10)
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static struct sk_buff *ksz9477_xmit(struct sk_buff *skb,
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struct net_device *dev)
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{
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struct dsa_port *dp = dsa_slave_to_port(dev);
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__be16 *tag;
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u8 *addr;
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u16 val;
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/* Tag encoding */
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tag = skb_put(skb, KSZ9477_INGRESS_TAG_LEN);
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addr = skb_mac_header(skb);
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val = BIT(dp->index);
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if (is_link_local_ether_addr(addr))
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val |= KSZ9477_TAIL_TAG_OVERRIDE;
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*tag = cpu_to_be16(val);
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return skb;
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}
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static struct sk_buff *ksz9477_rcv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt)
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{
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/* Tag decoding */
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u8 *tag = skb_tail_pointer(skb) - KSZ_EGRESS_TAG_LEN;
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unsigned int port = tag[0] & 7;
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unsigned int len = KSZ_EGRESS_TAG_LEN;
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/* Extra 4-bytes PTP timestamp */
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if (tag[0] & KSZ9477_PTP_TAG_INDICATION)
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len += KSZ9477_PTP_TAG_LEN;
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return ksz_common_rcv(skb, dev, port, len);
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}
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static const struct dsa_device_ops ksz9477_netdev_ops = {
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.name = "ksz9477",
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.proto = DSA_TAG_PROTO_KSZ9477,
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.xmit = ksz9477_xmit,
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.rcv = ksz9477_rcv,
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.overhead = KSZ9477_INGRESS_TAG_LEN,
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.tail_tag = true,
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};
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DSA_TAG_DRIVER(ksz9477_netdev_ops);
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MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9477);
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#define KSZ9893_TAIL_TAG_OVERRIDE BIT(5)
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#define KSZ9893_TAIL_TAG_LOOKUP BIT(6)
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static struct sk_buff *ksz9893_xmit(struct sk_buff *skb,
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struct net_device *dev)
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{
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struct dsa_port *dp = dsa_slave_to_port(dev);
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u8 *addr;
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u8 *tag;
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/* Tag encoding */
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tag = skb_put(skb, KSZ_INGRESS_TAG_LEN);
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addr = skb_mac_header(skb);
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*tag = BIT(dp->index);
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if (is_link_local_ether_addr(addr))
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*tag |= KSZ9893_TAIL_TAG_OVERRIDE;
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return skb;
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}
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static const struct dsa_device_ops ksz9893_netdev_ops = {
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.name = "ksz9893",
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.proto = DSA_TAG_PROTO_KSZ9893,
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.xmit = ksz9893_xmit,
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.rcv = ksz9477_rcv,
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.overhead = KSZ_INGRESS_TAG_LEN,
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.tail_tag = true,
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};
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DSA_TAG_DRIVER(ksz9893_netdev_ops);
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MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9893);
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static struct dsa_tag_driver *dsa_tag_driver_array[] = {
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&DSA_TAG_DRIVER_NAME(ksz8795_netdev_ops),
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&DSA_TAG_DRIVER_NAME(ksz9477_netdev_ops),
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&DSA_TAG_DRIVER_NAME(ksz9893_netdev_ops),
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};
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module_dsa_tag_drivers(dsa_tag_driver_array);
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MODULE_LICENSE("GPL");
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