![Vivien Didelot](/assets/img/avatar_default.png)
Store a pointer to the dsa_port structure in the dsa_slave_priv structure, instead of the switch/port index. This will allow to store more information such as the bridge device, needed in DSA drivers for multi-chip configuration. Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Signed-off-by: David S. Miller <davem@davemloft.net>
112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
/*
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* net/dsa/tag_trailer.c - Trailer tag format handling
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* Copyright (c) 2008-2009 Marvell Semiconductor
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/etherdevice.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include "dsa_priv.h"
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static struct sk_buff *trailer_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct dsa_slave_priv *p = netdev_priv(dev);
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struct sk_buff *nskb;
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int padlen;
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u8 *trailer;
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/*
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* We have to make sure that the trailer ends up as the very
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* last 4 bytes of the packet. This means that we have to pad
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* the packet to the minimum ethernet frame size, if necessary,
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* before adding the trailer.
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*/
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padlen = 0;
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if (skb->len < 60)
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padlen = 60 - skb->len;
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nskb = alloc_skb(NET_IP_ALIGN + skb->len + padlen + 4, GFP_ATOMIC);
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if (nskb == NULL) {
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kfree_skb(skb);
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return NULL;
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}
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skb_reserve(nskb, NET_IP_ALIGN);
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skb_reset_mac_header(nskb);
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skb_set_network_header(nskb, skb_network_header(skb) - skb->head);
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skb_set_transport_header(nskb, skb_transport_header(skb) - skb->head);
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skb_copy_and_csum_dev(skb, skb_put(nskb, skb->len));
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kfree_skb(skb);
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if (padlen) {
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u8 *pad = skb_put(nskb, padlen);
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memset(pad, 0, padlen);
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}
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trailer = skb_put(nskb, 4);
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trailer[0] = 0x80;
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trailer[1] = 1 << p->dp->index;
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trailer[2] = 0x10;
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trailer[3] = 0x00;
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return nskb;
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}
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static int trailer_rcv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt, struct net_device *orig_dev)
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{
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struct dsa_switch_tree *dst = dev->dsa_ptr;
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struct dsa_switch *ds;
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u8 *trailer;
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int source_port;
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if (unlikely(dst == NULL))
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goto out_drop;
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ds = dst->cpu_switch;
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skb = skb_unshare(skb, GFP_ATOMIC);
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if (skb == NULL)
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goto out;
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if (skb_linearize(skb))
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goto out_drop;
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trailer = skb_tail_pointer(skb) - 4;
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if (trailer[0] != 0x80 || (trailer[1] & 0xf8) != 0x00 ||
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(trailer[2] & 0xef) != 0x00 || trailer[3] != 0x00)
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goto out_drop;
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source_port = trailer[1] & 7;
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if (source_port >= ds->num_ports || !ds->ports[source_port].netdev)
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goto out_drop;
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pskb_trim_rcsum(skb, skb->len - 4);
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skb->dev = ds->ports[source_port].netdev;
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skb_push(skb, ETH_HLEN);
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skb->pkt_type = PACKET_HOST;
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skb->protocol = eth_type_trans(skb, skb->dev);
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skb->dev->stats.rx_packets++;
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skb->dev->stats.rx_bytes += skb->len;
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netif_receive_skb(skb);
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return 0;
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out_drop:
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kfree_skb(skb);
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out:
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return 0;
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}
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const struct dsa_device_ops trailer_netdev_ops = {
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.xmit = trailer_xmit,
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.rcv = trailer_rcv,
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};
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