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![Florian Fainelli](/assets/img/avatar_default.png)
All DSA tag receive functions do strictly the same thing after they have located the originating source port from their tag specific protocol: - push ETH_HLEN bytes - set pkt_type to PACKET_HOST - call eth_type_trans() - bump up counters - call netif_receive_skb() Factor all of that into dsa_switch_rcv(). This also makes us return a pointer to a sk_buff, which makes us symetric with the xmit function. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
191 lines
4.6 KiB
C
191 lines
4.6 KiB
C
/*
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* net/dsa/tag_edsa.c - Ethertype DSA tagging
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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 <net/dsa.h>
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#include "dsa_priv.h"
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#define DSA_HLEN 4
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#define EDSA_HLEN 8
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static struct sk_buff *edsa_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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u8 *edsa_header;
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/*
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* Convert the outermost 802.1q tag to a DSA tag and prepend
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* a DSA ethertype field is the packet is tagged, or insert
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* a DSA ethertype plus DSA tag between the addresses and the
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* current ethertype field if the packet is untagged.
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*/
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if (skb->protocol == htons(ETH_P_8021Q)) {
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if (skb_cow_head(skb, DSA_HLEN) < 0)
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goto out_free;
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skb_push(skb, DSA_HLEN);
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memmove(skb->data, skb->data + DSA_HLEN, 2 * ETH_ALEN);
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/*
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* Construct tagged FROM_CPU DSA tag from 802.1q tag.
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*/
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edsa_header = skb->data + 2 * ETH_ALEN;
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edsa_header[0] = (ETH_P_EDSA >> 8) & 0xff;
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edsa_header[1] = ETH_P_EDSA & 0xff;
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edsa_header[2] = 0x00;
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edsa_header[3] = 0x00;
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edsa_header[4] = 0x60 | p->dp->ds->index;
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edsa_header[5] = p->dp->index << 3;
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/*
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* Move CFI field from byte 6 to byte 5.
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*/
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if (edsa_header[6] & 0x10) {
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edsa_header[5] |= 0x01;
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edsa_header[6] &= ~0x10;
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}
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} else {
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if (skb_cow_head(skb, EDSA_HLEN) < 0)
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goto out_free;
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skb_push(skb, EDSA_HLEN);
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memmove(skb->data, skb->data + EDSA_HLEN, 2 * ETH_ALEN);
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/*
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* Construct untagged FROM_CPU DSA tag.
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*/
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edsa_header = skb->data + 2 * ETH_ALEN;
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edsa_header[0] = (ETH_P_EDSA >> 8) & 0xff;
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edsa_header[1] = ETH_P_EDSA & 0xff;
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edsa_header[2] = 0x00;
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edsa_header[3] = 0x00;
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edsa_header[4] = 0x40 | p->dp->ds->index;
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edsa_header[5] = p->dp->index << 3;
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edsa_header[6] = 0x00;
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edsa_header[7] = 0x00;
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}
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return skb;
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out_free:
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kfree_skb(skb);
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return NULL;
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}
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static struct sk_buff *edsa_rcv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt,
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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 *edsa_header;
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int source_device;
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int source_port;
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if (unlikely(!pskb_may_pull(skb, EDSA_HLEN)))
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goto out_drop;
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/*
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* Skip the two null bytes after the ethertype.
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*/
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edsa_header = skb->data + 2;
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/*
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* Check that frame type is either TO_CPU or FORWARD.
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*/
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if ((edsa_header[0] & 0xc0) != 0x00 && (edsa_header[0] & 0xc0) != 0xc0)
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goto out_drop;
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/*
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* Determine source device and port.
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*/
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source_device = edsa_header[0] & 0x1f;
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source_port = (edsa_header[1] >> 3) & 0x1f;
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/*
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* Check that the source device exists and that the source
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* port is a registered DSA port.
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*/
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if (source_device >= DSA_MAX_SWITCHES)
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goto out_drop;
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ds = dst->ds[source_device];
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if (!ds)
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goto out_drop;
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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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/*
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* If the 'tagged' bit is set, convert the DSA tag to a 802.1q
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* tag and delete the ethertype part. If the 'tagged' bit is
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* clear, delete the ethertype and the DSA tag parts.
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*/
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if (edsa_header[0] & 0x20) {
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u8 new_header[4];
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/*
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* Insert 802.1q ethertype and copy the VLAN-related
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* fields, but clear the bit that will hold CFI (since
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* DSA uses that bit location for another purpose).
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*/
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new_header[0] = (ETH_P_8021Q >> 8) & 0xff;
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new_header[1] = ETH_P_8021Q & 0xff;
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new_header[2] = edsa_header[2] & ~0x10;
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new_header[3] = edsa_header[3];
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/*
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* Move CFI bit from its place in the DSA header to
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* its 802.1q-designated place.
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*/
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if (edsa_header[1] & 0x01)
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new_header[2] |= 0x10;
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skb_pull_rcsum(skb, DSA_HLEN);
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/*
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* Update packet checksum if skb is CHECKSUM_COMPLETE.
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*/
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if (skb->ip_summed == CHECKSUM_COMPLETE) {
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__wsum c = skb->csum;
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c = csum_add(c, csum_partial(new_header + 2, 2, 0));
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c = csum_sub(c, csum_partial(edsa_header + 2, 2, 0));
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skb->csum = c;
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}
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memcpy(edsa_header, new_header, DSA_HLEN);
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memmove(skb->data - ETH_HLEN,
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skb->data - ETH_HLEN - DSA_HLEN,
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2 * ETH_ALEN);
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} else {
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/*
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* Remove DSA tag and update checksum.
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*/
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skb_pull_rcsum(skb, EDSA_HLEN);
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memmove(skb->data - ETH_HLEN,
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skb->data - ETH_HLEN - EDSA_HLEN,
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2 * ETH_ALEN);
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}
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skb->dev = ds->ports[source_port].netdev;
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return skb;
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out_drop:
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return NULL;
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}
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const struct dsa_device_ops edsa_netdev_ops = {
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.xmit = edsa_xmit,
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.rcv = edsa_rcv,
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};
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