Release 4.11 net/dsa/tag_trailer.c
/*
* net/dsa/tag_trailer.c - Trailer tag format handling
* Copyright (c) 2008-2009 Marvell Semiconductor
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/etherdevice.h>
#include <linux/list.h>
#include <linux/slab.h>
#include "dsa_priv.h"
static struct sk_buff *trailer_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct dsa_slave_priv *p = netdev_priv(dev);
struct sk_buff *nskb;
int padlen;
u8 *trailer;
/*
* We have to make sure that the trailer ends up as the very
* last 4 bytes of the packet. This means that we have to pad
* the packet to the minimum ethernet frame size, if necessary,
* before adding the trailer.
*/
padlen = 0;
if (skb->len < 60)
padlen = 60 - skb->len;
nskb = alloc_skb(NET_IP_ALIGN + skb->len + padlen + 4, GFP_ATOMIC);
if (nskb == NULL) {
kfree_skb(skb);
return NULL;
}
skb_reserve(nskb, NET_IP_ALIGN);
skb_reset_mac_header(nskb);
skb_set_network_header(nskb, skb_network_header(skb) - skb->head);
skb_set_transport_header(nskb, skb_transport_header(skb) - skb->head);
skb_copy_and_csum_dev(skb, skb_put(nskb, skb->len));
kfree_skb(skb);
if (padlen) {
u8 *pad = skb_put(nskb, padlen);
memset(pad, 0, padlen);
}
trailer = skb_put(nskb, 4);
trailer[0] = 0x80;
trailer[1] = 1 << p->dp->index;
trailer[2] = 0x10;
trailer[3] = 0x00;
return nskb;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lennert Buytenhek | 216 | 96.00% | 1 | 25.00% |
| Florian Fainelli | 6 | 2.67% | 2 | 50.00% |
| Vivien Didelot | 3 | 1.33% | 1 | 25.00% |
| Total | 225 | 100.00% | 4 | 100.00% |
static int trailer_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
struct dsa_switch_tree *dst = dev->dsa_ptr;
struct dsa_switch *ds;
u8 *trailer;
int source_port;
if (unlikely(dst == NULL))
goto out_drop;
ds = dst->cpu_switch;
skb = skb_unshare(skb, GFP_ATOMIC);
if (skb == NULL)
goto out;
if (skb_linearize(skb))
goto out_drop;
trailer = skb_tail_pointer(skb) - 4;
if (trailer[0] != 0x80 || (trailer[1] & 0xf8) != 0x00 ||
(trailer[2] & 0xef) != 0x00 || trailer[3] != 0x00)
goto out_drop;
source_port = trailer[1] & 7;
if (source_port >= ds->num_ports || !ds->ports[source_port].netdev)
goto out_drop;
pskb_trim_rcsum(skb, skb->len - 4);
skb->dev = ds->ports[source_port].netdev;
skb_push(skb, ETH_HLEN);
skb->pkt_type = PACKET_HOST;
skb->protocol = eth_type_trans(skb, skb->dev);
skb->dev->stats.rx_packets++;
skb->dev->stats.rx_bytes += skb->len;
netif_receive_skb(skb);
return 0;
out_drop:
kfree_skb(skb);
out:
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lennert Buytenhek | 254 | 96.21% | 3 | 42.86% |
| Andrew Lunn | 5 | 1.89% | 1 | 14.29% |
| Vivien Didelot | 4 | 1.52% | 2 | 28.57% |
| Neil Armstrong | 1 | 0.38% | 1 | 14.29% |
| Total | 264 | 100.00% | 7 | 100.00% |
const struct dsa_device_ops trailer_netdev_ops = {
.xmit = trailer_xmit,
.rcv = trailer_rcv,
};
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lennert Buytenhek | 491 | 94.61% | 3 | 27.27% |
| Florian Fainelli | 12 | 2.31% | 2 | 18.18% |
| Vivien Didelot | 7 | 1.35% | 3 | 27.27% |
| Andrew Lunn | 5 | 0.96% | 1 | 9.09% |
| Tejun Heo | 3 | 0.58% | 1 | 9.09% |
| Neil Armstrong | 1 | 0.19% | 1 | 9.09% |
| Total | 519 | 100.00% | 11 | 100.00% |
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