311 lines
10 KiB
C
311 lines
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef __DSA_TAG_H
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#define __DSA_TAG_H
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#include <linux/if_vlan.h>
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#include <linux/list.h>
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#include <linux/types.h>
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#include <net/dsa.h>
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#include "port.h"
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#include "slave.h"
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struct dsa_tag_driver {
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const struct dsa_device_ops *ops;
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struct list_head list;
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struct module *owner;
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};
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extern struct packet_type dsa_pack_type;
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const struct dsa_device_ops *dsa_tag_driver_get_by_id(int tag_protocol);
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const struct dsa_device_ops *dsa_tag_driver_get_by_name(const char *name);
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void dsa_tag_driver_put(const struct dsa_device_ops *ops);
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const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops);
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static inline int dsa_tag_protocol_overhead(const struct dsa_device_ops *ops)
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{
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return ops->needed_headroom + ops->needed_tailroom;
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}
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static inline struct net_device *dsa_master_find_slave(struct net_device *dev,
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int device, int port)
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{
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struct dsa_port *cpu_dp = dev->dsa_ptr;
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struct dsa_switch_tree *dst = cpu_dp->dst;
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struct dsa_port *dp;
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list_for_each_entry(dp, &dst->ports, list)
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if (dp->ds->index == device && dp->index == port &&
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dp->type == DSA_PORT_TYPE_USER)
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return dp->slave;
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return NULL;
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}
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/* If under a bridge with vlan_filtering=0, make sure to send pvid-tagged
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* frames as untagged, since the bridge will not untag them.
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*/
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static inline struct sk_buff *dsa_untag_bridge_pvid(struct sk_buff *skb)
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{
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struct dsa_port *dp = dsa_slave_to_port(skb->dev);
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struct net_device *br = dsa_port_bridge_dev_get(dp);
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struct net_device *dev = skb->dev;
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struct net_device *upper_dev;
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u16 vid, pvid, proto;
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int err;
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if (!br || br_vlan_enabled(br))
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return skb;
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err = br_vlan_get_proto(br, &proto);
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if (err)
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return skb;
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/* Move VLAN tag from data to hwaccel */
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if (!skb_vlan_tag_present(skb) && skb->protocol == htons(proto)) {
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skb = skb_vlan_untag(skb);
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if (!skb)
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return NULL;
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}
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if (!skb_vlan_tag_present(skb))
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return skb;
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vid = skb_vlan_tag_get_id(skb);
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/* We already run under an RCU read-side critical section since
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* we are called from netif_receive_skb_list_internal().
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*/
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err = br_vlan_get_pvid_rcu(dev, &pvid);
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if (err)
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return skb;
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if (vid != pvid)
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return skb;
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/* The sad part about attempting to untag from DSA is that we
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* don't know, unless we check, if the skb will end up in
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* the bridge's data path - br_allowed_ingress() - or not.
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* For example, there might be an 8021q upper for the
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* default_pvid of the bridge, which will steal VLAN-tagged traffic
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* from the bridge's data path. This is a configuration that DSA
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* supports because vlan_filtering is 0. In that case, we should
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* definitely keep the tag, to make sure it keeps working.
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*/
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upper_dev = __vlan_find_dev_deep_rcu(br, htons(proto), vid);
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if (upper_dev)
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return skb;
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__vlan_hwaccel_clear_tag(skb);
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return skb;
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}
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/* For switches without hardware support for DSA tagging to be able
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* to support termination through the bridge.
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*/
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static inline struct net_device *
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dsa_find_designated_bridge_port_by_vid(struct net_device *master, u16 vid)
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{
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struct dsa_port *cpu_dp = master->dsa_ptr;
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struct dsa_switch_tree *dst = cpu_dp->dst;
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struct bridge_vlan_info vinfo;
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struct net_device *slave;
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struct dsa_port *dp;
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int err;
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list_for_each_entry(dp, &dst->ports, list) {
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if (dp->type != DSA_PORT_TYPE_USER)
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continue;
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if (!dp->bridge)
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continue;
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if (dp->stp_state != BR_STATE_LEARNING &&
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dp->stp_state != BR_STATE_FORWARDING)
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continue;
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/* Since the bridge might learn this packet, keep the CPU port
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* affinity with the port that will be used for the reply on
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* xmit.
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*/
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if (dp->cpu_dp != cpu_dp)
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continue;
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slave = dp->slave;
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err = br_vlan_get_info_rcu(slave, vid, &vinfo);
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if (err)
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continue;
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return slave;
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}
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return NULL;
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}
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/* If the ingress port offloads the bridge, we mark the frame as autonomously
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* forwarded by hardware, so the software bridge doesn't forward in twice, back
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* to us, because we already did. However, if we're in fallback mode and we do
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* software bridging, we are not offloading it, therefore the dp->bridge
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* pointer is not populated, and flooding needs to be done by software (we are
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* effectively operating in standalone ports mode).
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*/
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static inline void dsa_default_offload_fwd_mark(struct sk_buff *skb)
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{
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struct dsa_port *dp = dsa_slave_to_port(skb->dev);
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skb->offload_fwd_mark = !!(dp->bridge);
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}
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/* Helper for removing DSA header tags from packets in the RX path.
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* Must not be called before skb_pull(len).
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* skb->data
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* |
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* v
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* | | | | | | | | | | | | | | | | | | |
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* +-----------------------+-----------------------+---------------+-------+
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* | Destination MAC | Source MAC | DSA header | EType |
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* +-----------------------+-----------------------+---------------+-------+
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* | |
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* <----- len -----> <----- len ----->
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* |
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* >>>>>>> v
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* >>>>>>> | | | | | | | | | | | | | | |
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* >>>>>>> +-----------------------+-----------------------+-------+
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* >>>>>>> | Destination MAC | Source MAC | EType |
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* +-----------------------+-----------------------+-------+
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* ^
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* |
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* skb->data
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*/
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static inline void dsa_strip_etype_header(struct sk_buff *skb, int len)
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{
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memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - len, 2 * ETH_ALEN);
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}
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/* Helper for creating space for DSA header tags in TX path packets.
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* Must not be called before skb_push(len).
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*
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* Before:
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*
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* <<<<<<< | | | | | | | | | | | | | | |
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* ^ <<<<<<< +-----------------------+-----------------------+-------+
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* | <<<<<<< | Destination MAC | Source MAC | EType |
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* | +-----------------------+-----------------------+-------+
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* <----- len ----->
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* |
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* |
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* skb->data
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*
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* After:
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*
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* | | | | | | | | | | | | | | | | | | |
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* +-----------------------+-----------------------+---------------+-------+
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* | Destination MAC | Source MAC | DSA header | EType |
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* +-----------------------+-----------------------+---------------+-------+
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* ^ | |
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* | <----- len ----->
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* skb->data
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*/
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static inline void dsa_alloc_etype_header(struct sk_buff *skb, int len)
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{
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memmove(skb->data, skb->data + len, 2 * ETH_ALEN);
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}
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/* On RX, eth_type_trans() on the DSA master pulls ETH_HLEN bytes starting from
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* skb_mac_header(skb), which leaves skb->data pointing at the first byte after
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* what the DSA master perceives as the EtherType (the beginning of the L3
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* protocol). Since DSA EtherType header taggers treat the EtherType as part of
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* the DSA tag itself, and the EtherType is 2 bytes in length, the DSA header
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* is located 2 bytes behind skb->data. Note that EtherType in this context
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* means the first 2 bytes of the DSA header, not the encapsulated EtherType
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* that will become visible after the DSA header is stripped.
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*/
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static inline void *dsa_etype_header_pos_rx(struct sk_buff *skb)
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{
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return skb->data - 2;
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}
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/* On TX, skb->data points to skb_mac_header(skb), which means that EtherType
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* header taggers start exactly where the EtherType is (the EtherType is
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* treated as part of the DSA header).
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*/
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static inline void *dsa_etype_header_pos_tx(struct sk_buff *skb)
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{
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return skb->data + 2 * ETH_ALEN;
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}
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/* Create 2 modaliases per tagging protocol, one to auto-load the module
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* given the ID reported by get_tag_protocol(), and the other by name.
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*/
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#define DSA_TAG_DRIVER_ALIAS "dsa_tag:"
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#define MODULE_ALIAS_DSA_TAG_DRIVER(__proto, __name) \
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MODULE_ALIAS(DSA_TAG_DRIVER_ALIAS __name); \
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MODULE_ALIAS(DSA_TAG_DRIVER_ALIAS "id-" \
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__stringify(__proto##_VALUE))
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void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[],
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unsigned int count,
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struct module *owner);
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void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[],
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unsigned int count);
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#define dsa_tag_driver_module_drivers(__dsa_tag_drivers_array, __count) \
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static int __init dsa_tag_driver_module_init(void) \
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{ \
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dsa_tag_drivers_register(__dsa_tag_drivers_array, __count, \
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THIS_MODULE); \
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return 0; \
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} \
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module_init(dsa_tag_driver_module_init); \
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\
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static void __exit dsa_tag_driver_module_exit(void) \
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{ \
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dsa_tag_drivers_unregister(__dsa_tag_drivers_array, __count); \
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} \
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module_exit(dsa_tag_driver_module_exit)
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/**
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* module_dsa_tag_drivers() - Helper macro for registering DSA tag
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* drivers
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* @__ops_array: Array of tag driver structures
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*
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* Helper macro for DSA tag drivers which do not do anything special
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* in module init/exit. Each module may only use this macro once, and
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* calling it replaces module_init() and module_exit().
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*/
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#define module_dsa_tag_drivers(__ops_array) \
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dsa_tag_driver_module_drivers(__ops_array, ARRAY_SIZE(__ops_array))
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#define DSA_TAG_DRIVER_NAME(__ops) dsa_tag_driver ## _ ## __ops
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/* Create a static structure we can build a linked list of dsa_tag
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* drivers
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*/
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#define DSA_TAG_DRIVER(__ops) \
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static struct dsa_tag_driver DSA_TAG_DRIVER_NAME(__ops) = { \
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.ops = &__ops, \
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}
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/**
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* module_dsa_tag_driver() - Helper macro for registering a single DSA tag
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* driver
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* @__ops: Single tag driver structures
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*
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* Helper macro for DSA tag drivers which do not do anything special
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* in module init/exit. Each module may only use this macro once, and
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* calling it replaces module_init() and module_exit().
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*/
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#define module_dsa_tag_driver(__ops) \
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DSA_TAG_DRIVER(__ops); \
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\
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static struct dsa_tag_driver *dsa_tag_driver_array[] = { \
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&DSA_TAG_DRIVER_NAME(__ops) \
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}; \
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module_dsa_tag_drivers(dsa_tag_driver_array)
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#endif
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