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Merge branch 'net-dsa-Improve-dsa_untag_bridge_pvid'

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Florian Fainelli says:

====================
net: dsa: Improve dsa_untag_bridge_pvid()

This patch series is based on the recent discussions with Vladimir:

https://lore.kernel.org/netdev/20201001030623.343535-1-f.fainelli@gmail.com/

the simplest way forward was to call dsa_untag_bridge_pvid() after
eth_type_trans() has been set which guarantees that skb->protocol is set
to a correct value and this allows us to utilize
__vlan_find_dev_deep_rcu() properly without playing or using the bridge
master as a net_device reference.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2020-10-02 13:36:07 -07:00
commit cb307c2d84
5 changed files with 24 additions and 23 deletions
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1
drivers/net/dsa/b53/b53_common.c
View file

@ -2603,6 +2603,7 @@ struct b53_device *b53_switch_alloc(struct device *base,
dev->ops = ops;
ds->ops = &b53_switch_ops;
ds->configure_vlan_while_not_filtering = true;
ds->untag_bridge_pvid = true;
dev->vlan_enabled = ds->configure_vlan_while_not_filtering;
mutex_init(&dev->reg_mutex);
mutex_init(&dev->stats_mutex);

8
include/net/dsa.h
View file

@ -308,6 +308,14 @@ struct dsa_switch {
*/
bool configure_vlan_while_not_filtering;
/* If the switch driver always programs the CPU port as egress tagged
* despite the VLAN configuration indicating otherwise, then setting
* @untag_bridge_pvid will force the DSA receive path to pop the bridge's
* default_pvid VLAN tagged frames to offer a consistent behavior
* between a vlan_filtering=0 and vlan_filtering=1 bridge device.
*/
bool untag_bridge_pvid;
/* In case vlan_filtering_is_global is set, the VLAN awareness state
* should be retrieved from here and not from the per-port settings.
*/

9
net/dsa/dsa.c
View file

@ -225,6 +225,15 @@ static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
skb->pkt_type = PACKET_HOST;
skb->protocol = eth_type_trans(skb, skb->dev);
if (unlikely(cpu_dp->ds->untag_bridge_pvid)) {
nskb = dsa_untag_bridge_pvid(skb);
if (!nskb) {
kfree_skb(skb);
return 0;
}
skb = nskb;
}
s = this_cpu_ptr(p->stats64);
u64_stats_update_begin(&s->syncp);
s->rx_packets++;

14
net/dsa/dsa_priv.h
View file

@ -201,11 +201,9 @@ dsa_slave_to_master(const struct net_device *dev)
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;
@ -217,7 +215,7 @@ static inline struct sk_buff *dsa_untag_bridge_pvid(struct sk_buff *skb)
return skb;
/* Move VLAN tag from data to hwaccel */
if (!skb_vlan_tag_present(skb) && hdr->h_vlan_proto == htons(proto)) {
if (!skb_vlan_tag_present(skb) && skb->protocol == htons(proto)) {
skb = skb_vlan_untag(skb);
if (!skb)
return NULL;
@ -247,13 +245,9 @@ static inline struct sk_buff *dsa_untag_bridge_pvid(struct sk_buff *skb)
* 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;
}
upper_dev = __vlan_find_dev_deep_rcu(br, htons(proto), vid);
if (upper_dev)
return skb;
__vlan_hwaccel_clear_tag(skb);

15
net/dsa/tag_brcm.c
View file

@ -152,11 +152,6 @@ 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;
@ -187,7 +182,7 @@ 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 dsa_untag_bridge_pvid(nskb);
return nskb;
}
static const struct dsa_device_ops brcm_netdev_ops = {
@ -214,14 +209,8 @@ 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 */
nskb = brcm_tag_rcv_ll(skb, dev, pt, ETH_HLEN);
if (!nskb)
return nskb;
return dsa_untag_bridge_pvid(nskb);
return brcm_tag_rcv_ll(skb, dev, pt, ETH_HLEN);
}
static const struct dsa_device_ops brcm_prepend_netdev_ops = {