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tag_ksz.c
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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_xmit(struct sk_buff *skb, struct net_device *dev, int len) { struct sk_buff *nskb; int padlen; padlen = (skb->len >= ETH_ZLEN) ? 0 : ETH_ZLEN - skb->len; if (skb_tailroom(skb) >= padlen + len) { /* Let dsa_slave_xmit() free skb */ if (__skb_put_padto(skb, skb->len + padlen, false)) return NULL; nskb = skb; } else { nskb = alloc_skb(NET_IP_ALIGN + skb->len + padlen + len, GFP_ATOMIC); if (!nskb) return NULL; skb_reserve(nskb, NET_IP_ALIGN); skb_reset_mac_header(nskb); skb_set_network_header(nskb, skb_network_header(skb) - skb->head); skb_set_transport_header(nskb, skb_transport_header(skb) - skb->head); skb_copy_and_csum_dev(skb, skb_put(nskb, skb->len)); /* Let skb_put_padto() free nskb, and let dsa_slave_xmit() free * skb */ if (skb_put_padto(nskb, nskb->len + padlen)) return NULL; consume_skb(skb); } return nskb; } 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 -> 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; /* Tag encoding */ tag = skb_put(nskb, KSZ9477_INGRESS_TAG_LEN); addr = skb_mac_header(nskb); *tag = BIT(dp->index); if (is_link_local_ether_addr(addr)) *tag |= KSZ9477_TAIL_TAG_OVERRIDE; *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); } 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, }; 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); struct sk_buff *nskb; u8 *addr; u8 *tag; nskb = ksz_common_xmit(skb, dev, KSZ_INGRESS_TAG_LEN); if (!nskb) return NULL; /* Tag encoding */ tag = skb_put(nskb, KSZ_INGRESS_TAG_LEN); addr = skb_mac_header(nskb); *tag = BIT(dp->index); if (is_link_local_ether_addr(addr)) *tag |= KSZ9893_TAIL_TAG_OVERRIDE; return nskb; } 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, }; 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(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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