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d3eed0e57d
The main desire behind this is to provide coherent bridge information to
the fast path without locking.
For example, right now we set dp->bridge_dev and dp->bridge_num from
separate code paths, it is theoretically possible for a packet
transmission to read these two port properties consecutively and find a
bridge number which does not correspond with the bridge device.
Another desire is to start passing more complex bridge information to
dsa_switch_ops functions. For example, with FDB isolation, it is
expected that drivers will need to be passed the bridge which requested
an FDB/MDB entry to be offloaded, and along with that bridge_dev, the
associated bridge_num should be passed too, in case the driver might
want to implement an isolation scheme based on that number.
We already pass the {bridge_dev, bridge_num} pair to the TX forwarding
offload switch API, however we'd like to remove that and squash it into
the basic bridge join/leave API. So that means we need to pass this
pair to the bridge join/leave API.
During dsa_port_bridge_leave, first we unset dp->bridge_dev, then we
call the driver's .port_bridge_leave with what used to be our
dp->bridge_dev, but provided as an argument.
When bridge_dev and bridge_num get folded into a single structure, we
need to preserve this behavior in dsa_port_bridge_leave: we need a copy
of what used to be in dp->bridge.
Switch drivers check bridge membership by comparing dp->bridge_dev with
the provided bridge_dev, but now, if we provide the struct dsa_bridge as
a pointer, they cannot keep comparing dp->bridge to the provided
pointer, since this only points to an on-stack copy. To make this
obvious and prevent driver writers from forgetting and doing stupid
things, in this new API, the struct dsa_bridge is provided as a full
structure (not very large, contains an int and a pointer) instead of a
pointer. An explicit comparison function needs to be used to determine
bridge membership: dsa_port_offloads_bridge().
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Alvin Šipraga <alsi@bang-olufsen.dk>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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* Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com>
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*/
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#ifndef _NET_DSA_8021Q_H
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#define _NET_DSA_8021Q_H
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#include <linux/refcount.h>
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#include <linux/types.h>
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#include <net/dsa.h>
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struct dsa_switch;
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struct dsa_port;
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struct sk_buff;
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struct net_device;
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struct dsa_tag_8021q_vlan {
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struct list_head list;
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int port;
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u16 vid;
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refcount_t refcount;
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};
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struct dsa_8021q_context {
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struct dsa_switch *ds;
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struct list_head vlans;
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/* EtherType of RX VID, used for filtering on master interface */
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__be16 proto;
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};
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int dsa_tag_8021q_register(struct dsa_switch *ds, __be16 proto);
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void dsa_tag_8021q_unregister(struct dsa_switch *ds);
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struct sk_buff *dsa_8021q_xmit(struct sk_buff *skb, struct net_device *netdev,
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u16 tpid, u16 tci);
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void dsa_8021q_rcv(struct sk_buff *skb, int *source_port, int *switch_id);
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int dsa_tag_8021q_bridge_tx_fwd_offload(struct dsa_switch *ds, int port,
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struct dsa_bridge bridge);
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void dsa_tag_8021q_bridge_tx_fwd_unoffload(struct dsa_switch *ds, int port,
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struct dsa_bridge bridge);
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u16 dsa_8021q_bridge_tx_fwd_offload_vid(unsigned int bridge_num);
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u16 dsa_tag_8021q_tx_vid(const struct dsa_port *dp);
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u16 dsa_tag_8021q_rx_vid(const struct dsa_port *dp);
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int dsa_8021q_rx_switch_id(u16 vid);
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int dsa_8021q_rx_source_port(u16 vid);
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bool vid_is_dsa_8021q_rxvlan(u16 vid);
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bool vid_is_dsa_8021q_txvlan(u16 vid);
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bool vid_is_dsa_8021q(u16 vid);
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#endif /* _NET_DSA_8021Q_H */
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