diff options
author | Tristram Ha <Tristram.Ha@microchip.com> | 2019-07-29 20:49:46 +0300 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2019-07-31 01:12:50 +0300 |
commit | 016e43a26bab0126e33c9682f9d9d05eca9f0386 (patch) | |
tree | ee71f6103e2408036f7f7242d110326c7e193b80 /net/dsa | |
parent | 4c173472d051ac469f2dc816aa94484c730c7e61 (diff) | |
download | linux-016e43a26bab0126e33c9682f9d9d05eca9f0386.tar.xz |
net: dsa: ksz: Add KSZ8795 tag code
Add DSA tag code for Microchip KSZ8795 switch. The switch is simpler
and the tag is only 1 byte, instead of 2 as is the case with KSZ9477.
Signed-off-by: Tristram Ha <Tristram.Ha@microchip.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: David S. Miller <davem@davemloft.net>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Tristram Ha <Tristram.Ha@microchip.com>
Cc: Vivien Didelot <vivien.didelot@gmail.com>
Cc: Woojung Huh <woojung.huh@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dsa')
-rw-r--r-- | net/dsa/tag_ksz.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c index b4872b87d4a6..73605bcbb385 100644 --- a/net/dsa/tag_ksz.c +++ b/net/dsa/tag_ksz.c @@ -70,6 +70,67 @@ static struct sk_buff *ksz_common_rcv(struct sk_buff *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_INGRESS_TAG_LEN 1 + +#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); + struct sk_buff *nskb; + u8 *tag; + u8 *addr; + + nskb = ksz_common_xmit(skb, dev, KSZ8795_INGRESS_TAG_LEN); + if (!nskb) + return NULL; + + /* Tag encoding */ + tag = skb_put(nskb, KSZ8795_INGRESS_TAG_LEN); + addr = skb_mac_header(nskb); + + *tag = 1 << dp->index; + if (is_link_local_ether_addr(addr)) + *tag |= KSZ8795_TAIL_TAG_OVERRIDE; + + return nskb; +} + +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 = KSZ8795_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) @@ -183,6 +244,7 @@ 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), }; |