Commit e4a85c54 authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'net-dsa-b53-Configure-VLANs-while-not-filtering' 



Florian Fainelli says:

====================
net: dsa: b53: Configure VLANs while not filtering

These two patches allow the b53 driver which always configures its CPU
port as egress tagged to behave correctly with VLANs being always
configured whenever a port is added to a bridge.

Vladimir provides a patch that aligns the bridge with vlan_filtering=0
receive path to behave the same as vlan_filtering=1. Per discussion with
Nikolay, this behavior is deemed to be too DSA specific to be done in
the bridge proper.

This is a preliminary series for Vladimir to make
configure_vlan_while_filtering the default behavior for all DSA drivers
in the future.

Thanks!

Changes in v3:

- added Vladimir's Acked-by tag to patch #2
- removed unnecessary if_vlan.h inclusion in patch #2
- reworded commit message to be accurate with the code changes

Changes in v2:

- moved the call to dsa_untag_bridge_pvid() into net/dsa/tag_brcm.c
  since we have a single user for now
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents e0da7430 ed409f3b

drivers/net/dsa/b53/b53_common.c

+2 −17
Original line number Diff line number Diff line
@@ -1377,23 +1377,6 @@ EXPORT_SYMBOL(b53_phylink_mac_link_up); 
int b53_vlan_filtering(struct dsa_switch *ds, int port, bool vlan_filtering)

{

	struct b53_device *dev = ds->priv;

	u16 pvid, new_pvid;



	b53_read16(dev, B53_VLAN_PAGE, B53_VLAN_PORT_DEF_TAG(port), &pvid);

	if (!vlan_filtering) {

		/* Filtering is currently enabled, use the default PVID since

		 * the bridge does not expect tagging anymore

		 */

		dev->ports[port].pvid = pvid;

		new_pvid = b53_default_pvid(dev);

	} else {

		/* Filtering is currently disabled, restore the previous PVID */

		new_pvid = dev->ports[port].pvid;

	}



	if (pvid != new_pvid)

		b53_write16(dev, B53_VLAN_PAGE, B53_VLAN_PORT_DEF_TAG(port),

			    new_pvid);



	b53_enable_vlan(dev, dev->vlan_enabled, vlan_filtering);
@@ -2619,6 +2602,8 @@ struct b53_device *b53_switch_alloc(struct device *base, 
	dev->priv = priv;

	dev->ops = ops;

	ds->ops = &b53_switch_ops;

	ds->configure_vlan_while_not_filtering = true;

	dev->vlan_enabled = ds->configure_vlan_while_not_filtering;

	mutex_init(&dev->reg_mutex);

	mutex_init(&dev->stats_mutex);

drivers/net/dsa/b53/b53_priv.h

+0 −1
Original line number Diff line number Diff line
@@ -91,7 +91,6 @@ enum { 
struct b53_port {

	u16		vlan_ctl_mask;

	struct ethtool_eee eee;

	u16		pvid;

};



struct b53_vlan {

net/dsa/dsa_priv.h

+66 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ 
#ifndef __DSA_PRIV_H

#define __DSA_PRIV_H



#include <linux/if_bridge.h>

#include <linux/phy.h>

#include <linux/netdevice.h>

#include <linux/netpoll.h>
@@ -194,6 +195,71 @@ dsa_slave_to_master(const struct net_device *dev) 
	return dp->cpu_dp->master;

}



/* If under a bridge with vlan_filtering=0, make sure to send pvid-tagged

 * frames as untagged, since the bridge will not untag them.

 */

static inline struct sk_buff *dsa_untag_bridge_pvid(struct sk_buff *skb)

{

	struct dsa_port *dp = dsa_slave_to_port(skb->dev);

	struct vlan_ethhdr *hdr = vlan_eth_hdr(skb);

	struct net_device *br = dp->bridge_dev;

	struct net_device *dev = skb->dev;

	struct net_device *upper_dev;

	struct list_head *iter;

	u16 vid, pvid, proto;

	int err;



	if (!br || br_vlan_enabled(br))

		return skb;



	err = br_vlan_get_proto(br, &proto);

	if (err)

		return skb;



	/* Move VLAN tag from data to hwaccel */

	if (!skb_vlan_tag_present(skb) && hdr->h_vlan_proto == htons(proto)) {

		skb = skb_vlan_untag(skb);

		if (!skb)

			return NULL;

	}



	if (!skb_vlan_tag_present(skb))

		return skb;



	vid = skb_vlan_tag_get_id(skb);



	/* We already run under an RCU read-side critical section since

	 * we are called from netif_receive_skb_list_internal().

	 */

	err = br_vlan_get_pvid_rcu(dev, &pvid);

	if (err)

		return skb;



	if (vid != pvid)

		return skb;



	/* The sad part about attempting to untag from DSA is that we

	 * don't know, unless we check, if the skb will end up in

	 * the bridge's data path - br_allowed_ingress() - or not.

	 * For example, there might be an 8021q upper for the

	 * default_pvid of the bridge, which will steal VLAN-tagged traffic

	 * from the bridge's data path. This is a configuration that DSA

	 * supports because vlan_filtering is 0. In that case, we should

	 * definitely keep the tag, to make sure it keeps working.

	 */

	netdev_for_each_upper_dev_rcu(dev, upper_dev, iter) {

		if (!is_vlan_dev(upper_dev))

			continue;



		if (vid == vlan_dev_vlan_id(upper_dev))

			return skb;

	}



	__vlan_hwaccel_clear_tag(skb);



	return skb;

}



/* switch.c */

int dsa_switch_register_notifier(struct dsa_switch *ds);

void dsa_switch_unregister_notifier(struct dsa_switch *ds);

net/dsa/tag_brcm.c

+13 −2
Original line number Diff line number Diff line
@@ -140,6 +140,11 @@ static struct sk_buff *brcm_tag_rcv_ll(struct sk_buff *skb, 
	/* Remove Broadcom tag and update checksum */

	skb_pull_rcsum(skb, BRCM_TAG_LEN);



	/* Set the MAC header to where it should point for

	 * dsa_untag_bridge_pvid() to parse the correct VLAN header.

	 */

	skb_set_mac_header(skb, -ETH_HLEN);



	skb->offload_fwd_mark = 1;



	return skb;
@@ -191,7 +196,7 @@ static struct sk_buff *brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev, 
		nskb->data - ETH_HLEN - BRCM_TAG_LEN,

		2 * ETH_ALEN);



	return nskb;

	return dsa_untag_bridge_pvid(nskb);

}



static const struct dsa_device_ops brcm_netdev_ops = {
@@ -219,8 +224,14 @@ static struct sk_buff *brcm_tag_rcv_prepend(struct sk_buff *skb, 
					    struct net_device *dev,

					    struct packet_type *pt)

{

	struct sk_buff *nskb;



	/* tag is prepended to the packet */

	return brcm_tag_rcv_ll(skb, dev, pt, ETH_HLEN);

	nskb = brcm_tag_rcv_ll(skb, dev, pt, ETH_HLEN);

	if (!nskb)

		return nskb;



	return dsa_untag_bridge_pvid(nskb);

}



static const struct dsa_device_ops brcm_prepend_netdev_ops = {

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