128 lines
3.6 KiB
C
128 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com>
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*/
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#include <linux/if_vlan.h>
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#include <linux/dsa/sja1105.h>
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#include <linux/dsa/8021q.h>
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#include <linux/packing.h>
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#include "dsa_priv.h"
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/* Similar to is_link_local_ether_addr(hdr->h_dest) but also covers PTP */
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static inline bool sja1105_is_link_local(const struct sk_buff *skb)
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{
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const struct ethhdr *hdr = eth_hdr(skb);
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u64 dmac = ether_addr_to_u64(hdr->h_dest);
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if ((dmac & SJA1105_LINKLOCAL_FILTER_A_MASK) ==
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SJA1105_LINKLOCAL_FILTER_A)
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return true;
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if ((dmac & SJA1105_LINKLOCAL_FILTER_B_MASK) ==
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SJA1105_LINKLOCAL_FILTER_B)
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return true;
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return false;
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}
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/* This is the first time the tagger sees the frame on RX.
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* Figure out if we can decode it, and if we can, annotate skb->cb with how we
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* plan to do that, so we don't need to check again in the rcv function.
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*/
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static bool sja1105_filter(const struct sk_buff *skb, struct net_device *dev)
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{
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if (sja1105_is_link_local(skb))
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return true;
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if (!dsa_port_is_vlan_filtering(dev->dsa_ptr))
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return true;
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return false;
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}
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static struct sk_buff *sja1105_xmit(struct sk_buff *skb,
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struct net_device *netdev)
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{
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struct dsa_port *dp = dsa_slave_to_port(netdev);
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struct dsa_switch *ds = dp->ds;
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u16 tx_vid = dsa_8021q_tx_vid(ds, dp->index);
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u8 pcp = skb->priority;
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/* Transmitting management traffic does not rely upon switch tagging,
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* but instead SPI-installed management routes. Part 2 of this
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* is the .port_deferred_xmit driver callback.
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*/
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if (unlikely(sja1105_is_link_local(skb)))
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return dsa_defer_xmit(skb, netdev);
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/* If we are under a vlan_filtering bridge, IP termination on
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* switch ports based on 802.1Q tags is simply too brittle to
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* be passable. So just defer to the dsa_slave_notag_xmit
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* implementation.
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*/
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if (dsa_port_is_vlan_filtering(dp))
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return skb;
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return dsa_8021q_xmit(skb, netdev, ETH_P_SJA1105,
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((pcp << VLAN_PRIO_SHIFT) | tx_vid));
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}
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static struct sk_buff *sja1105_rcv(struct sk_buff *skb,
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struct net_device *netdev,
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struct packet_type *pt)
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{
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struct ethhdr *hdr = eth_hdr(skb);
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u64 source_port, switch_id;
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struct sk_buff *nskb;
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u16 tpid, vid, tci;
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bool is_tagged;
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nskb = dsa_8021q_rcv(skb, netdev, pt, &tpid, &tci);
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is_tagged = (nskb && tpid == ETH_P_SJA1105);
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skb->priority = (tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
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vid = tci & VLAN_VID_MASK;
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skb->offload_fwd_mark = 1;
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if (sja1105_is_link_local(skb)) {
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/* Management traffic path. Switch embeds the switch ID and
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* port ID into bytes of the destination MAC, courtesy of
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* the incl_srcpt options.
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*/
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source_port = hdr->h_dest[3];
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switch_id = hdr->h_dest[4];
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/* Clear the DMAC bytes that were mangled by the switch */
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hdr->h_dest[3] = 0;
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hdr->h_dest[4] = 0;
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} else {
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/* Normal traffic path. */
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source_port = dsa_8021q_rx_source_port(vid);
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switch_id = dsa_8021q_rx_switch_id(vid);
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}
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skb->dev = dsa_master_find_slave(netdev, switch_id, source_port);
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if (!skb->dev) {
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netdev_warn(netdev, "Couldn't decode source port\n");
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return NULL;
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}
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/* Delete/overwrite fake VLAN header, DSA expects to not find
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* it there, see dsa_switch_rcv: skb_push(skb, ETH_HLEN).
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*/
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if (is_tagged)
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memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - VLAN_HLEN,
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ETH_HLEN - VLAN_HLEN);
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return skb;
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}
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static struct dsa_device_ops sja1105_netdev_ops = {
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.name = "sja1105",
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.proto = DSA_TAG_PROTO_SJA1105,
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.xmit = sja1105_xmit,
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.rcv = sja1105_rcv,
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.filter = sja1105_filter,
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.overhead = VLAN_HLEN,
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};
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SJA1105);
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module_dsa_tag_driver(sja1105_netdev_ops);
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