cregit-Linux how code gets into the kernel

Release 4.14 net/dsa/tag_trailer.c

Directory: net/dsa
 * 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) 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)); consume_skb(skb); if (padlen) { skb_put_zero(nskb, padlen); } trailer = skb_put(nskb, 4); trailer[0] = 0x80; trailer[1] = 1 << p->dp->index; trailer[2] = 0x10; trailer[3] = 0x00; return nskb; }


Lennert Buytenhek19294.12%114.29%
Florian Fainelli62.94%228.57%
Vivien Didelot41.96%228.57%
Eric Dumazet10.49%114.29%
yuan linyu10.49%114.29%

static struct sk_buff *trailer_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt) { struct dsa_switch_tree *dst = dev->dsa_ptr; struct dsa_port *cpu_dp = dsa_get_cpu_port(dst); struct dsa_switch *ds = cpu_dp->ds; u8 *trailer; int source_port; if (skb_linearize(skb)) return NULL; trailer = skb_tail_pointer(skb) - 4; if (trailer[0] != 0x80 || (trailer[1] & 0xf8) != 0x00 || (trailer[2] & 0xef) != 0x00 || trailer[3] != 0x00) return NULL; source_port = trailer[1] & 7; if (source_port >= ds->num_ports || !ds->ports[source_port].netdev) return NULL; pskb_trim_rcsum(skb, skb->len - 4); skb->dev = ds->ports[source_port].netdev; return skb; }


Lennert Buytenhek13979.43%225.00%
Florian Fainelli1810.29%225.00%
Vivien Didelot126.86%225.00%
Andrew Lunn52.86%112.50%
Neil Armstrong10.57%112.50%

const struct dsa_device_ops trailer_netdev_ops = { .xmit = trailer_xmit, .rcv = trailer_rcv, };

Overall Contributors

Lennert Buytenhek35286.06%213.33%
Florian Fainelli307.33%426.67%
Vivien Didelot163.91%426.67%
Andrew Lunn51.22%16.67%
Tejun Heo30.73%16.67%
yuan linyu10.24%16.67%
Eric Dumazet10.24%16.67%
Neil Armstrong10.24%16.67%
Directory: net/dsa
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