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net: dsa: tag_sja1105: implement sub-VLAN decoding

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Create a subvlan_map as part of each port's tagger private structure.
This keeps reverse mappings of bridge-to-dsa_8021q VLAN retagging rules.

Note that as of this patch, this piece of code is never engaged, due to
the fact that the driver hasn't installed any retagging rule, so we'll
always see packets with a subvlan code of 0 (untagged).

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean 2020-05-12 20:20:34 +03:00 committed by David S. Miller
parent 3eaae1d05f
commit 84eeb5d460
3 changed files with 25 additions and 0 deletions
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4
drivers/net/dsa/sja1105/sja1105_main.c
View File

@ -2856,6 +2856,7 @@ static int sja1105_probe(struct spi_device *spi)
struct sja1105_port *sp = &priv->ports[port];
struct dsa_port *dp = dsa_to_port(ds, port);
struct net_device *slave;
int subvlan;
if (!dsa_is_user_port(ds, port))
continue;
@ -2876,6 +2877,9 @@ static int sja1105_probe(struct spi_device *spi)
}
skb_queue_head_init(&sp->xmit_queue);
sp->xmit_tpid = ETH_P_SJA1105;
for (subvlan = 0; subvlan < DSA_8021Q_N_SUBVLAN; subvlan++)
sp->subvlan_map[subvlan] = VLAN_N_VID;
}
return 0;

2
include/linux/dsa/sja1105.h
View File

@ -9,6 +9,7 @@
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/dsa/8021q.h>
#include <net/dsa.h>
#define ETH_P_SJA1105 ETH_P_DSA_8021Q
@ -53,6 +54,7 @@ struct sja1105_skb_cb {
((struct sja1105_skb_cb *)DSA_SKB_CB_PRIV(skb))
struct sja1105_port {
u16 subvlan_map[DSA_8021Q_N_SUBVLAN];
struct kthread_worker *xmit_worker;
struct kthread_work xmit_work;
struct sk_buff_head xmit_queue;

19
net/dsa/tag_sja1105.c
View File

@ -254,6 +254,20 @@ static struct sk_buff
return skb;
}
static void sja1105_decode_subvlan(struct sk_buff *skb, u16 subvlan)
{
struct dsa_port *dp = dsa_slave_to_port(skb->dev);
struct sja1105_port *sp = dp->priv;
u16 vid = sp->subvlan_map[subvlan];
u16 vlan_tci;
if (vid == VLAN_N_VID)
return;
vlan_tci = (skb->priority << VLAN_PRIO_SHIFT) | vid;
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci);
}
static struct sk_buff *sja1105_rcv(struct sk_buff *skb,
struct net_device *netdev,
struct packet_type *pt)
@ -263,6 +277,7 @@ static struct sk_buff *sja1105_rcv(struct sk_buff *skb,
struct ethhdr *hdr;
u16 tpid, vid, tci;
bool is_link_local;
u16 subvlan = 0;
bool is_tagged;
bool is_meta;
@ -286,6 +301,7 @@ static struct sk_buff *sja1105_rcv(struct sk_buff *skb,
source_port = dsa_8021q_rx_source_port(vid);
switch_id = dsa_8021q_rx_switch_id(vid);
skb->priority = (tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
subvlan = dsa_8021q_rx_subvlan(vid);
} else if (is_link_local) {
/* Management traffic path. Switch embeds the switch ID and
* port ID into bytes of the destination MAC, courtesy of
@ -310,6 +326,9 @@ static struct sk_buff *sja1105_rcv(struct sk_buff *skb,
return NULL;
}
if (subvlan)
sja1105_decode_subvlan(skb, subvlan);
return sja1105_rcv_meta_state_machine(skb, &meta, is_link_local,
is_meta);
}