Commit d82f8ab0 authored by Tobias Waldekranz's avatar Tobias Waldekranz Committed by David S. Miller

net: dsa: tag_dsa: offload the bridge forwarding process

Allow the DSA tagger to generate FORWARD frames for offloaded skbs
sent from a bridge that we offload, allowing the switch to handle any
frame replication that may be required. This also means that source
address learning takes place on packets sent from the CPU, meaning
that return traffic no longer needs to be flooded as unknown unicast.
Signed-off-by: default avatarTobias Waldekranz <tobias@waldekranz.com>
Signed-off-by: default avatarVladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ce5df689
...@@ -126,7 +126,42 @@ static struct sk_buff *dsa_xmit_ll(struct sk_buff *skb, struct net_device *dev, ...@@ -126,7 +126,42 @@ static struct sk_buff *dsa_xmit_ll(struct sk_buff *skb, struct net_device *dev,
u8 extra) u8 extra)
{ {
struct dsa_port *dp = dsa_slave_to_port(dev); struct dsa_port *dp = dsa_slave_to_port(dev);
u8 tag_dev, tag_port;
enum dsa_cmd cmd;
u8 *dsa_header; u8 *dsa_header;
u16 pvid = 0;
int err;
if (skb->offload_fwd_mark) {
struct dsa_switch_tree *dst = dp->ds->dst;
struct net_device *br = dp->bridge_dev;
cmd = DSA_CMD_FORWARD;
/* When offloading forwarding for a bridge, inject FORWARD
* packets on behalf of a virtual switch device with an index
* past the physical switches.
*/
tag_dev = dst->last_switch + 1 + dp->bridge_num;
tag_port = 0;
/* If we are offloading forwarding for a VLAN-unaware bridge,
* inject packets to hardware using the bridge's pvid, since
* that's where the packets ingressed from.
*/
if (!br_vlan_enabled(br)) {
/* Safe because __dev_queue_xmit() runs under
* rcu_read_lock_bh()
*/
err = br_vlan_get_pvid_rcu(br, &pvid);
if (err)
return NULL;
}
} else {
cmd = DSA_CMD_FROM_CPU;
tag_dev = dp->ds->index;
tag_port = dp->index;
}
if (skb->protocol == htons(ETH_P_8021Q)) { if (skb->protocol == htons(ETH_P_8021Q)) {
if (extra) { if (extra) {
...@@ -134,10 +169,10 @@ static struct sk_buff *dsa_xmit_ll(struct sk_buff *skb, struct net_device *dev, ...@@ -134,10 +169,10 @@ static struct sk_buff *dsa_xmit_ll(struct sk_buff *skb, struct net_device *dev,
memmove(skb->data, skb->data + extra, 2 * ETH_ALEN); memmove(skb->data, skb->data + extra, 2 * ETH_ALEN);
} }
/* Construct tagged FROM_CPU DSA tag from 802.1Q tag. */ /* Construct tagged DSA tag from 802.1Q tag. */
dsa_header = skb->data + 2 * ETH_ALEN + extra; dsa_header = skb->data + 2 * ETH_ALEN + extra;
dsa_header[0] = (DSA_CMD_FROM_CPU << 6) | 0x20 | dp->ds->index; dsa_header[0] = (cmd << 6) | 0x20 | tag_dev;
dsa_header[1] = dp->index << 3; dsa_header[1] = tag_port << 3;
/* Move CFI field from byte 2 to byte 1. */ /* Move CFI field from byte 2 to byte 1. */
if (dsa_header[2] & 0x10) { if (dsa_header[2] & 0x10) {
...@@ -148,12 +183,13 @@ static struct sk_buff *dsa_xmit_ll(struct sk_buff *skb, struct net_device *dev, ...@@ -148,12 +183,13 @@ static struct sk_buff *dsa_xmit_ll(struct sk_buff *skb, struct net_device *dev,
skb_push(skb, DSA_HLEN + extra); skb_push(skb, DSA_HLEN + extra);
memmove(skb->data, skb->data + DSA_HLEN + extra, 2 * ETH_ALEN); memmove(skb->data, skb->data + DSA_HLEN + extra, 2 * ETH_ALEN);
/* Construct untagged FROM_CPU DSA tag. */ /* Construct untagged DSA tag. */
dsa_header = skb->data + 2 * ETH_ALEN + extra; dsa_header = skb->data + 2 * ETH_ALEN + extra;
dsa_header[0] = (DSA_CMD_FROM_CPU << 6) | dp->ds->index;
dsa_header[1] = dp->index << 3; dsa_header[0] = (cmd << 6) | tag_dev;
dsa_header[2] = 0x00; dsa_header[1] = tag_port << 3;
dsa_header[3] = 0x00; dsa_header[2] = pvid >> 8;
dsa_header[3] = pvid & 0xff;
} }
return skb; return skb;
......
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