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f81a43e8da
Now that tag drivers dynamically register, we don't need the static table. Remove it. This also means the tag driver structures can be made static. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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#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_port *dp = dsa_slave_to_port(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)
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return NULL;
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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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consume_skb(skb);
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if (padlen) {
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skb_put_zero(nskb, 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 << 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 struct sk_buff *trailer_rcv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt)
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{
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u8 *trailer;
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int source_port;
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if (skb_linearize(skb))
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return NULL;
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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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return NULL;
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source_port = trailer[1] & 7;
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skb->dev = dsa_master_find_slave(dev, 0, source_port);
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if (!skb->dev)
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return NULL;
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if (pskb_trim_rcsum(skb, skb->len - 4))
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return NULL;
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return skb;
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}
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static const struct dsa_device_ops trailer_netdev_ops = {
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.name = "trailer",
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.proto = DSA_TAG_PROTO_TRAILER,
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.xmit = trailer_xmit,
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.rcv = trailer_rcv,
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.overhead = 4,
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};
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_TRAILER);
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module_dsa_tag_driver(trailer_netdev_ops);
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