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net: dsa: tag_ksz: add tag handling for Microchip LAN937x 

The Microchip LAN937X switches have a tagging protocol which is
very similar to KSZ tagging. So that the implementation is added to
tag_ksz.c and reused common APIs

Signed-off-by: Prasanna Vengateshan <prasanna.vengateshan@microchip.com>
Signed-off-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Prasanna Vengateshan 2022-07-01 20:30:20 +05:30 committed by David S. Miller
parent 8926d94e5c
commit 092f875131
3 changed files with 63 additions and 2 deletions
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2
include/net/dsa.h
View File

@ -54,6 +54,7 @@ struct phylink_link_state;
#define DSA_TAG_PROTO_RTL8_4_VALUE 24
#define DSA_TAG_PROTO_RTL8_4T_VALUE 25
#define DSA_TAG_PROTO_RZN1_A5PSW_VALUE 26
#define DSA_TAG_PROTO_LAN937X_VALUE 27
enum dsa_tag_protocol {
DSA_TAG_PROTO_NONE = DSA_TAG_PROTO_NONE_VALUE,
@ -83,6 +84,7 @@ enum dsa_tag_protocol {
DSA_TAG_PROTO_RTL8_4 = DSA_TAG_PROTO_RTL8_4_VALUE,
DSA_TAG_PROTO_RTL8_4T = DSA_TAG_PROTO_RTL8_4T_VALUE,
DSA_TAG_PROTO_RZN1_A5PSW = DSA_TAG_PROTO_RZN1_A5PSW_VALUE,
DSA_TAG_PROTO_LAN937X = DSA_TAG_PROTO_LAN937X_VALUE,
};
struct dsa_switch;

4
net/dsa/Kconfig
View File

@ -87,10 +87,10 @@ config NET_DSA_TAG_MTK
Mediatek switches.
config NET_DSA_TAG_KSZ
tristate "Tag driver for Microchip 8795/9477/9893 families of switches"
tristate "Tag driver for Microchip 8795/937x/9477/9893 families of switches"
help
Say Y if you want to enable support for tagging frames for the
Microchip 8795/9477/9893 families of switches.
Microchip 8795/937x/9477/9893 families of switches.
config NET_DSA_TAG_OCELOT
tristate "Tag driver for Ocelot family of switches, using NPI port"

59
net/dsa/tag_ksz.c
View File

@ -193,10 +193,69 @@ static const struct dsa_device_ops ksz9893_netdev_ops = {
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);