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tag_gswip.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Intel / Lantiq GSWIP V2.0 PMAC tag support
*
* Copyright (C) 2017 - 2018 Hauke Mehrtens <[email protected]>
*/
#include <linux/bitops.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <net/dsa.h>
#include "dsa_priv.h"
#define GSWIP_TX_HEADER_LEN 4
/* special tag in TX path header */
/* Byte 0 */
#define GSWIP_TX_SLPID_SHIFT 0 /* source port ID */
#define GSWIP_TX_SLPID_CPU 2
#define GSWIP_TX_SLPID_APP1 3
#define GSWIP_TX_SLPID_APP2 4
#define GSWIP_TX_SLPID_APP3 5
#define GSWIP_TX_SLPID_APP4 6
#define GSWIP_TX_SLPID_APP5 7
/* Byte 1 */
#define GSWIP_TX_CRCGEN_DIS BIT(7)
#define GSWIP_TX_DPID_SHIFT 0 /* destination group ID */
#define GSWIP_TX_DPID_ELAN 0
#define GSWIP_TX_DPID_EWAN 1
#define GSWIP_TX_DPID_CPU 2
#define GSWIP_TX_DPID_APP1 3
#define GSWIP_TX_DPID_APP2 4
#define GSWIP_TX_DPID_APP3 5
#define GSWIP_TX_DPID_APP4 6
#define GSWIP_TX_DPID_APP5 7
/* Byte 2 */
#define GSWIP_TX_PORT_MAP_EN BIT(7)
#define GSWIP_TX_PORT_MAP_SEL BIT(6)
#define GSWIP_TX_LRN_DIS BIT(5)
#define GSWIP_TX_CLASS_EN BIT(4)
#define GSWIP_TX_CLASS_SHIFT 0
#define GSWIP_TX_CLASS_MASK GENMASK(3, 0)
/* Byte 3 */
#define GSWIP_TX_DPID_EN BIT(0)
#define GSWIP_TX_PORT_MAP_SHIFT 1
#define GSWIP_TX_PORT_MAP_MASK GENMASK(6, 1)
#define GSWIP_RX_HEADER_LEN 8
/* special tag in RX path header */
/* Byte 7 */
#define GSWIP_RX_SPPID_SHIFT 4
#define GSWIP_RX_SPPID_MASK GENMASK(6, 4)
static struct sk_buff *gswip_tag_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct dsa_port *dp = dsa_slave_to_port(dev);
int err;
u8 *gswip_tag;
err = skb_cow_head(skb, GSWIP_TX_HEADER_LEN);
if (err)
return NULL;
skb_push(skb, GSWIP_TX_HEADER_LEN);
gswip_tag = skb->data;
gswip_tag[0] = GSWIP_TX_SLPID_CPU;
gswip_tag[1] = GSWIP_TX_DPID_ELAN;
gswip_tag[2] = GSWIP_TX_PORT_MAP_EN | GSWIP_TX_PORT_MAP_SEL;
gswip_tag[3] = BIT(dp->index + GSWIP_TX_PORT_MAP_SHIFT) & GSWIP_TX_PORT_MAP_MASK;
gswip_tag[3] |= GSWIP_TX_DPID_EN;
return skb;
}
static struct sk_buff *gswip_tag_rcv(struct sk_buff *skb,
struct net_device *dev,
struct packet_type *pt)
{
int port;
u8 *gswip_tag;
if (unlikely(!pskb_may_pull(skb, GSWIP_RX_HEADER_LEN)))
return NULL;
gswip_tag = skb->data - ETH_HLEN;
/* Get source port information */
port = (gswip_tag[7] & GSWIP_RX_SPPID_MASK) >> GSWIP_RX_SPPID_SHIFT;
skb->dev = dsa_master_find_slave(dev, 0, port);
if (!skb->dev)
return NULL;
/* remove GSWIP tag */
skb_pull_rcsum(skb, GSWIP_RX_HEADER_LEN);
return skb;
}
const struct dsa_device_ops gswip_netdev_ops = {
.xmit = gswip_tag_xmit,
.rcv = gswip_tag_rcv,
.overhead = GSWIP_RX_HEADER_LEN,
};