// SPDX-License-Identifier: GPL-2.0+ /* * net/dsa/tag_ksz.c - Microchip KSZ Switch tag format handling * Copyright (c) 2017 Microchip Technology */ #include #include #include #include "tag.h" #define KSZ8795_NAME "ksz8795" #define KSZ9477_NAME "ksz9477" #define KSZ9893_NAME "ksz9893" #define LAN937X_NAME "lan937x" /* 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; if (pskb_trim_rcsum(skb, skb->len - len)) return NULL; dsa_default_offload_fwd_mark(skb); 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; if (skb->ip_summed == CHECKSUM_PARTIAL && skb_checksum_help(skb)) return NULL; /* 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) { 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_NAME, .proto = DSA_TAG_PROTO_KSZ8795, .xmit = ksz8795_xmit, .rcv = ksz8795_rcv, .needed_tailroom = KSZ_INGRESS_TAG_LEN, }; DSA_TAG_DRIVER(ksz8795_netdev_ops); MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ8795, KSZ8795_NAME); /* * 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; if (skb->ip_summed == CHECKSUM_PARTIAL && skb_checksum_help(skb)) return NULL; /* 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) { /* 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_NAME, .proto = DSA_TAG_PROTO_KSZ9477, .xmit = ksz9477_xmit, .rcv = ksz9477_rcv, .needed_tailroom = KSZ9477_INGRESS_TAG_LEN, }; DSA_TAG_DRIVER(ksz9477_netdev_ops); MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9477, KSZ9477_NAME); #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; if (skb->ip_summed == CHECKSUM_PARTIAL && skb_checksum_help(skb)) return NULL; /* 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_NAME, .proto = DSA_TAG_PROTO_KSZ9893, .xmit = ksz9893_xmit, .rcv = ksz9477_rcv, .needed_tailroom = KSZ_INGRESS_TAG_LEN, }; DSA_TAG_DRIVER(ksz9893_netdev_ops); MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9893, KSZ9893_NAME); /* For xmit, 2 bytes are added before FCS. * --------------------------------------------------------------------------- * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|tag1(1byte)|FCS(4bytes) * --------------------------------------------------------------------------- * tag0 : represents tag override, lookup and valid * tag1 : each bit represents port (eg, 0x01=port1, 0x02=port2, 0x80=port8) * * For rcv, 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, 0x07=port8) */ #define LAN937X_EGRESS_TAG_LEN 2 #define LAN937X_TAIL_TAG_BLOCKING_OVERRIDE BIT(11) #define LAN937X_TAIL_TAG_LOOKUP BIT(12) #define LAN937X_TAIL_TAG_VALID BIT(13) #define LAN937X_TAIL_TAG_PORT_MASK 7 static struct sk_buff *lan937x_xmit(struct sk_buff *skb, struct net_device *dev) { struct dsa_port *dp = dsa_slave_to_port(dev); const struct ethhdr *hdr = eth_hdr(skb); __be16 *tag; u16 val; if (skb->ip_summed == CHECKSUM_PARTIAL && skb_checksum_help(skb)) return NULL; tag = skb_put(skb, LAN937X_EGRESS_TAG_LEN); val = BIT(dp->index); if (is_link_local_ether_addr(hdr->h_dest)) val |= LAN937X_TAIL_TAG_BLOCKING_OVERRIDE; /* Tail tag valid bit - This bit should always be set by the CPU */ val |= LAN937X_TAIL_TAG_VALID; put_unaligned_be16(val, tag); return skb; } static const struct dsa_device_ops lan937x_netdev_ops = { .name = LAN937X_NAME, .proto = DSA_TAG_PROTO_LAN937X, .xmit = lan937x_xmit, .rcv = ksz9477_rcv, .needed_tailroom = LAN937X_EGRESS_TAG_LEN, }; DSA_TAG_DRIVER(lan937x_netdev_ops); MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_LAN937X, LAN937X_NAME); 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), &DSA_TAG_DRIVER_NAME(lan937x_netdev_ops), }; module_dsa_tag_drivers(dsa_tag_driver_array); MODULE_LICENSE("GPL");