Release 4.14 net/dsa/tag_mtk.c
/*
* Mediatek DSA Tag support
* Copyright (C) 2017 Landen Chao <landen.chao@mediatek.com>
* Sean Wang <sean.wang@mediatek.com>
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/etherdevice.h>
#include "dsa_priv.h"
#define MTK_HDR_LEN 4
#define MTK_HDR_RECV_SOURCE_PORT_MASK GENMASK(2, 0)
#define MTK_HDR_XMIT_DP_BIT_MASK GENMASK(5, 0)
static struct sk_buff *mtk_tag_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct dsa_slave_priv *p = netdev_priv(dev);
u8 *mtk_tag;
if (skb_cow_head(skb, MTK_HDR_LEN) < 0)
return NULL;
skb_push(skb, MTK_HDR_LEN);
memmove(skb->data, skb->data + MTK_HDR_LEN, 2 * ETH_ALEN);
/* Build the tag after the MAC Source Address */
mtk_tag = skb->data + 2 * ETH_ALEN;
mtk_tag[0] = 0;
mtk_tag[1] = (1 << p->dp->index) & MTK_HDR_XMIT_DP_BIT_MASK;
mtk_tag[2] = 0;
mtk_tag[3] = 0;
return skb;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Sean Wang | 119 | 97.54% | 1 | 50.00% |
Vivien Didelot | 3 | 2.46% | 1 | 50.00% |
Total | 122 | 100.00% | 2 | 100.00% |
static struct sk_buff *mtk_tag_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt)
{
struct dsa_switch_tree *dst = dev->dsa_ptr;
struct dsa_switch *ds;
int port;
__be16 *phdr, hdr;
if (unlikely(!pskb_may_pull(skb, MTK_HDR_LEN)))
return NULL;
/* The MTK header is added by the switch between src addr
* and ethertype at this point, skb->data points to 2 bytes
* after src addr so header should be 2 bytes right before.
*/
phdr = (__be16 *)(skb->data - 2);
hdr = ntohs(*phdr);
/* Remove MTK tag and recalculate checksum. */
skb_pull_rcsum(skb, MTK_HDR_LEN);
memmove(skb->data - ETH_HLEN,
skb->data - ETH_HLEN - MTK_HDR_LEN,
2 * ETH_ALEN);
/* This protocol doesn't support cascading multiple
* switches so it's safe to assume the switch is first
* in the tree.
*/
ds = dst->ds[0];
if (!ds)
return NULL;
/* Get source port information */
port = (hdr & MTK_HDR_RECV_SOURCE_PORT_MASK);
if (!ds->ports[port].netdev)
return NULL;
skb->dev = ds->ports[port].netdev;
return skb;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Sean Wang | 159 | 92.44% | 1 | 33.33% |
Vivien Didelot | 9 | 5.23% | 1 | 33.33% |
Florian Fainelli | 4 | 2.33% | 1 | 33.33% |
Total | 172 | 100.00% | 3 | 100.00% |
static int mtk_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
int *offset)
{
*offset = 4;
*proto = ((__be16 *)skb->data)[1];
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
John Crispin | 44 | 100.00% | 1 | 100.00% |
Total | 44 | 100.00% | 1 | 100.00% |
const struct dsa_device_ops mtk_netdev_ops = {
.xmit = mtk_tag_xmit,
.rcv = mtk_tag_rcv,
.flow_dissect = mtk_tag_flow_dissect,
};
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Sean Wang | 314 | 82.85% | 1 | 20.00% |
John Crispin | 49 | 12.93% | 1 | 20.00% |
Vivien Didelot | 12 | 3.17% | 2 | 40.00% |
Florian Fainelli | 4 | 1.06% | 1 | 20.00% |
Total | 379 | 100.00% | 5 | 100.00% |
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