diff options
Diffstat (limited to 'net/dsa/tag_ksz.c')
| -rw-r--r-- | net/dsa/tag_ksz.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c new file mode 100644 index 000000000..429250298 --- /dev/null +++ b/net/dsa/tag_ksz.c @@ -0,0 +1,264 @@ +// 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 <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; + + 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", + .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); + +/* + * 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", + .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); + +#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", + .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); + +/* 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", + .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); + +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"); |