diff options
Diffstat (limited to 'net/dsa/tag.h')
| -rw-r--r-- | net/dsa/tag.h | 185 |
1 files changed, 142 insertions, 43 deletions
diff --git a/net/dsa/tag.h b/net/dsa/tag.h index 7cfbca824f1c..cf52283fe9df 100644 --- a/net/dsa/tag.h +++ b/net/dsa/tag.h @@ -9,7 +9,7 @@ #include <net/dsa.h> #include "port.h" -#include "slave.h" +#include "user.h" struct dsa_tag_driver { const struct dsa_device_ops *ops; @@ -29,7 +29,7 @@ static inline int dsa_tag_protocol_overhead(const struct dsa_device_ops *ops) return ops->needed_headroom + ops->needed_tailroom; } -static inline struct net_device *dsa_master_find_slave(struct net_device *dev, +static inline struct net_device *dsa_conduit_find_user(struct net_device *dev, int device, int port) { struct dsa_port *cpu_dp = dev->dsa_ptr; @@ -39,51 +39,86 @@ static inline struct net_device *dsa_master_find_slave(struct net_device *dev, list_for_each_entry(dp, &dst->ports, list) if (dp->ds->index == device && dp->index == port && dp->type == DSA_PORT_TYPE_USER) - return dp->slave; + return dp->user; return NULL; } -/* If under a bridge with vlan_filtering=0, make sure to send pvid-tagged - * frames as untagged, since the bridge will not untag them. +/** + * dsa_software_untag_vlan_aware_bridge: Software untagging for VLAN-aware bridge + * @skb: Pointer to received socket buffer (packet) + * @br: Pointer to bridge upper interface of ingress port + * @vid: Parsed VID from packet + * + * The bridge can process tagged packets. Software like STP/PTP may not. The + * bridge can also process untagged packets, to the same effect as if they were + * tagged with the PVID of the ingress port. So packets tagged with the PVID of + * the bridge port must be software-untagged, to support both use cases. */ -static inline struct sk_buff *dsa_untag_bridge_pvid(struct sk_buff *skb) +static inline void dsa_software_untag_vlan_aware_bridge(struct sk_buff *skb, + struct net_device *br, + u16 vid) { - struct dsa_port *dp = dsa_slave_to_port(skb->dev); - struct net_device *br = dsa_port_bridge_dev_get(dp); - struct net_device *dev = skb->dev; - struct net_device *upper_dev; - u16 vid, pvid, proto; + u16 pvid, proto; int err; - if (!br || br_vlan_enabled(br)) - return skb; - err = br_vlan_get_proto(br, &proto); if (err) - return skb; + return; - /* Move VLAN tag from data to hwaccel */ - if (!skb_vlan_tag_present(skb) && skb->protocol == htons(proto)) { - skb = skb_vlan_untag(skb); - if (!skb) - return NULL; - } + err = br_vlan_get_pvid_rcu(skb->dev, &pvid); + if (err) + return; - if (!skb_vlan_tag_present(skb)) - return skb; + if (vid == pvid && skb->vlan_proto == htons(proto)) + __vlan_hwaccel_clear_tag(skb); +} - vid = skb_vlan_tag_get_id(skb); +/** + * dsa_software_untag_vlan_unaware_bridge: Software untagging for VLAN-unaware bridge + * @skb: Pointer to received socket buffer (packet) + * @br: Pointer to bridge upper interface of ingress port + * @vid: Parsed VID from packet + * + * The bridge ignores all VLAN tags. Software like STP/PTP may not (it may run + * on the plain port, or on a VLAN upper interface). Maybe packets are coming + * to software as tagged with a driver-defined VID which is NOT equal to the + * PVID of the bridge port (since the bridge is VLAN-unaware, its configuration + * should NOT be committed to hardware). DSA needs a method for this private + * VID to be communicated by software to it, and if packets are tagged with it, + * software-untag them. Note: the private VID may be different per bridge, to + * support the FDB isolation use case. + * + * FIXME: this is currently implemented based on the broken assumption that + * the "private VID" used by the driver in VLAN-unaware mode is equal to the + * bridge PVID. It should not be, except for a coincidence; the bridge PVID is + * irrelevant to the data path in the VLAN-unaware mode. Thus, the VID that + * this function removes is wrong. + * + * All users of ds->untag_bridge_pvid should fix their drivers, if necessary, + * to make the two independent. Only then, if there still remains a need to + * strip the private VID from packets, then a new ds->ops->get_private_vid() + * API shall be introduced to communicate to DSA what this VID is, which needs + * to be stripped here. + */ +static inline void dsa_software_untag_vlan_unaware_bridge(struct sk_buff *skb, + struct net_device *br, + u16 vid) +{ + struct net_device *upper_dev; + u16 pvid, proto; + int err; - /* 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); + err = br_vlan_get_proto(br, &proto); if (err) - return skb; + return; - if (vid != pvid) - return skb; + err = br_vlan_get_pvid_rcu(skb->dev, &pvid); + if (err) + return; + + if (vid != pvid || skb->vlan_proto != htons(proto)) + return; /* 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 @@ -95,10 +130,56 @@ static inline struct sk_buff *dsa_untag_bridge_pvid(struct sk_buff *skb) * definitely keep the tag, to make sure it keeps working. */ upper_dev = __vlan_find_dev_deep_rcu(br, htons(proto), vid); - if (upper_dev) + if (!upper_dev) + __vlan_hwaccel_clear_tag(skb); +} + +/** + * dsa_software_vlan_untag: Software VLAN untagging in DSA receive path + * @skb: Pointer to socket buffer (packet) + * + * Receive path method for switches which send some packets as VLAN-tagged + * towards the CPU port (generally from VLAN-aware bridge ports) even when the + * packet was not tagged on the wire. Called when ds->untag_bridge_pvid + * (legacy) or ds->untag_vlan_aware_bridge_pvid is set to true. + * + * As a side effect of this method, any VLAN tag from the skb head is moved + * to hwaccel. + */ +static inline struct sk_buff *dsa_software_vlan_untag(struct sk_buff *skb) +{ + struct dsa_port *dp = dsa_user_to_port(skb->dev); + struct net_device *br = dsa_port_bridge_dev_get(dp); + u16 vid, proto; + int err; + + /* software untagging for standalone ports not yet necessary */ + if (!br) return skb; - __vlan_hwaccel_clear_tag(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) && skb->protocol == 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); + + if (br_vlan_enabled(br)) { + if (dp->ds->untag_vlan_aware_bridge_pvid) + dsa_software_untag_vlan_aware_bridge(skb, br, vid); + } else { + if (dp->ds->untag_bridge_pvid) + dsa_software_untag_vlan_unaware_bridge(skb, br, vid); + } return skb; } @@ -107,12 +188,12 @@ static inline struct sk_buff *dsa_untag_bridge_pvid(struct sk_buff *skb) * to support termination through the bridge. */ static inline struct net_device * -dsa_find_designated_bridge_port_by_vid(struct net_device *master, u16 vid) +dsa_find_designated_bridge_port_by_vid(struct net_device *conduit, u16 vid) { - struct dsa_port *cpu_dp = master->dsa_ptr; + struct dsa_port *cpu_dp = conduit->dsa_ptr; struct dsa_switch_tree *dst = cpu_dp->dst; struct bridge_vlan_info vinfo; - struct net_device *slave; + struct net_device *user; struct dsa_port *dp; int err; @@ -134,13 +215,13 @@ dsa_find_designated_bridge_port_by_vid(struct net_device *master, u16 vid) if (dp->cpu_dp != cpu_dp) continue; - slave = dp->slave; + user = dp->user; - err = br_vlan_get_info_rcu(slave, vid, &vinfo); + err = br_vlan_get_info_rcu(user, vid, &vinfo); if (err) continue; - return slave; + return user; } return NULL; @@ -155,7 +236,7 @@ dsa_find_designated_bridge_port_by_vid(struct net_device *master, u16 vid) */ static inline void dsa_default_offload_fwd_mark(struct sk_buff *skb) { - struct dsa_port *dp = dsa_slave_to_port(skb->dev); + struct dsa_port *dp = dsa_user_to_port(skb->dev); skb->offload_fwd_mark = !!(dp->bridge); } @@ -215,9 +296,9 @@ static inline void dsa_alloc_etype_header(struct sk_buff *skb, int len) memmove(skb->data, skb->data + len, 2 * ETH_ALEN); } -/* On RX, eth_type_trans() on the DSA master pulls ETH_HLEN bytes starting from +/* On RX, eth_type_trans() on the DSA conduit pulls ETH_HLEN bytes starting from * skb_mac_header(skb), which leaves skb->data pointing at the first byte after - * what the DSA master perceives as the EtherType (the beginning of the L3 + * what the DSA conduit perceives as the EtherType (the beginning of the L3 * protocol). Since DSA EtherType header taggers treat the EtherType as part of * the DSA tag itself, and the EtherType is 2 bytes in length, the DSA header * is located 2 bytes behind skb->data. Note that EtherType in this context @@ -229,7 +310,7 @@ static inline void *dsa_etype_header_pos_rx(struct sk_buff *skb) return skb->data - 2; } -/* On TX, skb->data points to skb_mac_header(skb), which means that EtherType +/* On TX, skb->data points to the MAC header, which means that EtherType * header taggers start exactly where the EtherType is (the EtherType is * treated as part of the DSA header). */ @@ -238,6 +319,24 @@ static inline void *dsa_etype_header_pos_tx(struct sk_buff *skb) return skb->data + 2 * ETH_ALEN; } +static inline unsigned long dsa_xmit_port_mask(const struct sk_buff *skb, + const struct net_device *dev) +{ + struct dsa_port *dp = dsa_user_to_port(dev); + unsigned long mask = BIT(dp->index); + + if (IS_ENABLED(CONFIG_HSR) && + unlikely(dev->features & NETIF_F_HW_HSR_DUP)) { + struct net_device *hsr_dev = dp->hsr_dev; + struct dsa_port *other_dp; + + dsa_hsr_foreach_port(other_dp, dp->ds, hsr_dev) + mask |= BIT(other_dp->index); + } + + return mask; +} + /* Create 2 modaliases per tagging protocol, one to auto-load the module * given the ID reported by get_tag_protocol(), and the other by name. */ |