mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Vladimir Oltean](/assets/img/avatar_default.png)
Once commit 6d1ccff627
("net: reset mac header in dev_start_xmit()")
will be reverted, it will no longer be true that skb->data points at
skb_mac_header(skb) - since the skb->mac_header will not be set - so
stop saying that, and just say that it points to the MAC header.
I've reviewed vlan_insert_tag() and it does not *actually* depend on
skb_mac_header(), so reword that to avoid the confusion.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
524 lines
13 KiB
C
524 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com>
|
|
*
|
|
* This module is not a complete tagger implementation. It only provides
|
|
* primitives for taggers that rely on 802.1Q VLAN tags to use.
|
|
*/
|
|
#include <linux/if_vlan.h>
|
|
#include <linux/dsa/8021q.h>
|
|
|
|
#include "port.h"
|
|
#include "switch.h"
|
|
#include "tag.h"
|
|
#include "tag_8021q.h"
|
|
|
|
/* Binary structure of the fake 12-bit VID field (when the TPID is
|
|
* ETH_P_DSA_8021Q):
|
|
*
|
|
* | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|
|
* +-----------+-----+-----------------+-----------+-----------------------+
|
|
* | RSV | VBID| SWITCH_ID | VBID | PORT |
|
|
* +-----------+-----+-----------------+-----------+-----------------------+
|
|
*
|
|
* RSV - VID[11:10]:
|
|
* Reserved. Must be set to 3 (0b11).
|
|
*
|
|
* SWITCH_ID - VID[8:6]:
|
|
* Index of switch within DSA tree. Must be between 0 and 7.
|
|
*
|
|
* VBID - { VID[9], VID[5:4] }:
|
|
* Virtual bridge ID. If between 1 and 7, packet targets the broadcast
|
|
* domain of a bridge. If transmitted as zero, packet targets a single
|
|
* port.
|
|
*
|
|
* PORT - VID[3:0]:
|
|
* Index of switch port. Must be between 0 and 15.
|
|
*/
|
|
|
|
#define DSA_8021Q_RSV_VAL 3
|
|
#define DSA_8021Q_RSV_SHIFT 10
|
|
#define DSA_8021Q_RSV_MASK GENMASK(11, 10)
|
|
#define DSA_8021Q_RSV ((DSA_8021Q_RSV_VAL << DSA_8021Q_RSV_SHIFT) & \
|
|
DSA_8021Q_RSV_MASK)
|
|
|
|
#define DSA_8021Q_SWITCH_ID_SHIFT 6
|
|
#define DSA_8021Q_SWITCH_ID_MASK GENMASK(8, 6)
|
|
#define DSA_8021Q_SWITCH_ID(x) (((x) << DSA_8021Q_SWITCH_ID_SHIFT) & \
|
|
DSA_8021Q_SWITCH_ID_MASK)
|
|
|
|
#define DSA_8021Q_VBID_HI_SHIFT 9
|
|
#define DSA_8021Q_VBID_HI_MASK GENMASK(9, 9)
|
|
#define DSA_8021Q_VBID_LO_SHIFT 4
|
|
#define DSA_8021Q_VBID_LO_MASK GENMASK(5, 4)
|
|
#define DSA_8021Q_VBID_HI(x) (((x) & GENMASK(2, 2)) >> 2)
|
|
#define DSA_8021Q_VBID_LO(x) ((x) & GENMASK(1, 0))
|
|
#define DSA_8021Q_VBID(x) \
|
|
(((DSA_8021Q_VBID_LO(x) << DSA_8021Q_VBID_LO_SHIFT) & \
|
|
DSA_8021Q_VBID_LO_MASK) | \
|
|
((DSA_8021Q_VBID_HI(x) << DSA_8021Q_VBID_HI_SHIFT) & \
|
|
DSA_8021Q_VBID_HI_MASK))
|
|
|
|
#define DSA_8021Q_PORT_SHIFT 0
|
|
#define DSA_8021Q_PORT_MASK GENMASK(3, 0)
|
|
#define DSA_8021Q_PORT(x) (((x) << DSA_8021Q_PORT_SHIFT) & \
|
|
DSA_8021Q_PORT_MASK)
|
|
|
|
struct dsa_tag_8021q_vlan {
|
|
struct list_head list;
|
|
int port;
|
|
u16 vid;
|
|
refcount_t refcount;
|
|
};
|
|
|
|
struct dsa_8021q_context {
|
|
struct dsa_switch *ds;
|
|
struct list_head vlans;
|
|
/* EtherType of RX VID, used for filtering on master interface */
|
|
__be16 proto;
|
|
};
|
|
|
|
u16 dsa_tag_8021q_bridge_vid(unsigned int bridge_num)
|
|
{
|
|
/* The VBID value of 0 is reserved for precise TX, but it is also
|
|
* reserved/invalid for the bridge_num, so all is well.
|
|
*/
|
|
return DSA_8021Q_RSV | DSA_8021Q_VBID(bridge_num);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dsa_tag_8021q_bridge_vid);
|
|
|
|
/* Returns the VID that will be installed as pvid for this switch port, sent as
|
|
* tagged egress towards the CPU port and decoded by the rcv function.
|
|
*/
|
|
u16 dsa_tag_8021q_standalone_vid(const struct dsa_port *dp)
|
|
{
|
|
return DSA_8021Q_RSV | DSA_8021Q_SWITCH_ID(dp->ds->index) |
|
|
DSA_8021Q_PORT(dp->index);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dsa_tag_8021q_standalone_vid);
|
|
|
|
/* Returns the decoded switch ID from the RX VID. */
|
|
int dsa_8021q_rx_switch_id(u16 vid)
|
|
{
|
|
return (vid & DSA_8021Q_SWITCH_ID_MASK) >> DSA_8021Q_SWITCH_ID_SHIFT;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dsa_8021q_rx_switch_id);
|
|
|
|
/* Returns the decoded port ID from the RX VID. */
|
|
int dsa_8021q_rx_source_port(u16 vid)
|
|
{
|
|
return (vid & DSA_8021Q_PORT_MASK) >> DSA_8021Q_PORT_SHIFT;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dsa_8021q_rx_source_port);
|
|
|
|
/* Returns the decoded VBID from the RX VID. */
|
|
static int dsa_tag_8021q_rx_vbid(u16 vid)
|
|
{
|
|
u16 vbid_hi = (vid & DSA_8021Q_VBID_HI_MASK) >> DSA_8021Q_VBID_HI_SHIFT;
|
|
u16 vbid_lo = (vid & DSA_8021Q_VBID_LO_MASK) >> DSA_8021Q_VBID_LO_SHIFT;
|
|
|
|
return (vbid_hi << 2) | vbid_lo;
|
|
}
|
|
|
|
bool vid_is_dsa_8021q(u16 vid)
|
|
{
|
|
u16 rsv = (vid & DSA_8021Q_RSV_MASK) >> DSA_8021Q_RSV_SHIFT;
|
|
|
|
return rsv == DSA_8021Q_RSV_VAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vid_is_dsa_8021q);
|
|
|
|
static struct dsa_tag_8021q_vlan *
|
|
dsa_tag_8021q_vlan_find(struct dsa_8021q_context *ctx, int port, u16 vid)
|
|
{
|
|
struct dsa_tag_8021q_vlan *v;
|
|
|
|
list_for_each_entry(v, &ctx->vlans, list)
|
|
if (v->vid == vid && v->port == port)
|
|
return v;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int dsa_port_do_tag_8021q_vlan_add(struct dsa_port *dp, u16 vid,
|
|
u16 flags)
|
|
{
|
|
struct dsa_8021q_context *ctx = dp->ds->tag_8021q_ctx;
|
|
struct dsa_switch *ds = dp->ds;
|
|
struct dsa_tag_8021q_vlan *v;
|
|
int port = dp->index;
|
|
int err;
|
|
|
|
/* No need to bother with refcounting for user ports */
|
|
if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp)))
|
|
return ds->ops->tag_8021q_vlan_add(ds, port, vid, flags);
|
|
|
|
v = dsa_tag_8021q_vlan_find(ctx, port, vid);
|
|
if (v) {
|
|
refcount_inc(&v->refcount);
|
|
return 0;
|
|
}
|
|
|
|
v = kzalloc(sizeof(*v), GFP_KERNEL);
|
|
if (!v)
|
|
return -ENOMEM;
|
|
|
|
err = ds->ops->tag_8021q_vlan_add(ds, port, vid, flags);
|
|
if (err) {
|
|
kfree(v);
|
|
return err;
|
|
}
|
|
|
|
v->vid = vid;
|
|
v->port = port;
|
|
refcount_set(&v->refcount, 1);
|
|
list_add_tail(&v->list, &ctx->vlans);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dsa_port_do_tag_8021q_vlan_del(struct dsa_port *dp, u16 vid)
|
|
{
|
|
struct dsa_8021q_context *ctx = dp->ds->tag_8021q_ctx;
|
|
struct dsa_switch *ds = dp->ds;
|
|
struct dsa_tag_8021q_vlan *v;
|
|
int port = dp->index;
|
|
int err;
|
|
|
|
/* No need to bother with refcounting for user ports */
|
|
if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp)))
|
|
return ds->ops->tag_8021q_vlan_del(ds, port, vid);
|
|
|
|
v = dsa_tag_8021q_vlan_find(ctx, port, vid);
|
|
if (!v)
|
|
return -ENOENT;
|
|
|
|
if (!refcount_dec_and_test(&v->refcount))
|
|
return 0;
|
|
|
|
err = ds->ops->tag_8021q_vlan_del(ds, port, vid);
|
|
if (err) {
|
|
refcount_inc(&v->refcount);
|
|
return err;
|
|
}
|
|
|
|
list_del(&v->list);
|
|
kfree(v);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool
|
|
dsa_port_tag_8021q_vlan_match(struct dsa_port *dp,
|
|
struct dsa_notifier_tag_8021q_vlan_info *info)
|
|
{
|
|
return dsa_port_is_dsa(dp) || dsa_port_is_cpu(dp) || dp == info->dp;
|
|
}
|
|
|
|
int dsa_switch_tag_8021q_vlan_add(struct dsa_switch *ds,
|
|
struct dsa_notifier_tag_8021q_vlan_info *info)
|
|
{
|
|
struct dsa_port *dp;
|
|
int err;
|
|
|
|
/* Since we use dsa_broadcast(), there might be other switches in other
|
|
* trees which don't support tag_8021q, so don't return an error.
|
|
* Or they might even support tag_8021q but have not registered yet to
|
|
* use it (maybe they use another tagger currently).
|
|
*/
|
|
if (!ds->ops->tag_8021q_vlan_add || !ds->tag_8021q_ctx)
|
|
return 0;
|
|
|
|
dsa_switch_for_each_port(dp, ds) {
|
|
if (dsa_port_tag_8021q_vlan_match(dp, info)) {
|
|
u16 flags = 0;
|
|
|
|
if (dsa_port_is_user(dp))
|
|
flags |= BRIDGE_VLAN_INFO_UNTAGGED |
|
|
BRIDGE_VLAN_INFO_PVID;
|
|
|
|
err = dsa_port_do_tag_8021q_vlan_add(dp, info->vid,
|
|
flags);
|
|
if (err)
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dsa_switch_tag_8021q_vlan_del(struct dsa_switch *ds,
|
|
struct dsa_notifier_tag_8021q_vlan_info *info)
|
|
{
|
|
struct dsa_port *dp;
|
|
int err;
|
|
|
|
if (!ds->ops->tag_8021q_vlan_del || !ds->tag_8021q_ctx)
|
|
return 0;
|
|
|
|
dsa_switch_for_each_port(dp, ds) {
|
|
if (dsa_port_tag_8021q_vlan_match(dp, info)) {
|
|
err = dsa_port_do_tag_8021q_vlan_del(dp, info->vid);
|
|
if (err)
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* There are 2 ways of offloading tag_8021q VLANs.
|
|
*
|
|
* One is to use a hardware TCAM to push the port's standalone VLAN into the
|
|
* frame when forwarding it to the CPU, as an egress modification rule on the
|
|
* CPU port. This is preferable because it has no side effects for the
|
|
* autonomous forwarding path, and accomplishes tag_8021q's primary goal of
|
|
* identifying the source port of each packet based on VLAN ID.
|
|
*
|
|
* The other is to commit the tag_8021q VLAN as a PVID to the VLAN table, and
|
|
* to configure the port as VLAN-unaware. This is less preferable because
|
|
* unique source port identification can only be done for standalone ports;
|
|
* under a VLAN-unaware bridge, all ports share the same tag_8021q VLAN as
|
|
* PVID, and under a VLAN-aware bridge, packets received by software will not
|
|
* have tag_8021q VLANs appended, just bridge VLANs.
|
|
*
|
|
* For tag_8021q implementations of the second type, this method is used to
|
|
* replace the standalone tag_8021q VLAN of a port with the tag_8021q VLAN to
|
|
* be used for VLAN-unaware bridging.
|
|
*/
|
|
int dsa_tag_8021q_bridge_join(struct dsa_switch *ds, int port,
|
|
struct dsa_bridge bridge)
|
|
{
|
|
struct dsa_port *dp = dsa_to_port(ds, port);
|
|
u16 standalone_vid, bridge_vid;
|
|
int err;
|
|
|
|
/* Delete the standalone VLAN of the port and replace it with a
|
|
* bridging VLAN
|
|
*/
|
|
standalone_vid = dsa_tag_8021q_standalone_vid(dp);
|
|
bridge_vid = dsa_tag_8021q_bridge_vid(bridge.num);
|
|
|
|
err = dsa_port_tag_8021q_vlan_add(dp, bridge_vid, true);
|
|
if (err)
|
|
return err;
|
|
|
|
dsa_port_tag_8021q_vlan_del(dp, standalone_vid, false);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dsa_tag_8021q_bridge_join);
|
|
|
|
void dsa_tag_8021q_bridge_leave(struct dsa_switch *ds, int port,
|
|
struct dsa_bridge bridge)
|
|
{
|
|
struct dsa_port *dp = dsa_to_port(ds, port);
|
|
u16 standalone_vid, bridge_vid;
|
|
int err;
|
|
|
|
/* Delete the bridging VLAN of the port and replace it with a
|
|
* standalone VLAN
|
|
*/
|
|
standalone_vid = dsa_tag_8021q_standalone_vid(dp);
|
|
bridge_vid = dsa_tag_8021q_bridge_vid(bridge.num);
|
|
|
|
err = dsa_port_tag_8021q_vlan_add(dp, standalone_vid, false);
|
|
if (err) {
|
|
dev_err(ds->dev,
|
|
"Failed to delete tag_8021q standalone VLAN %d from port %d: %pe\n",
|
|
standalone_vid, port, ERR_PTR(err));
|
|
}
|
|
|
|
dsa_port_tag_8021q_vlan_del(dp, bridge_vid, true);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dsa_tag_8021q_bridge_leave);
|
|
|
|
/* Set up a port's standalone tag_8021q VLAN */
|
|
static int dsa_tag_8021q_port_setup(struct dsa_switch *ds, int port)
|
|
{
|
|
struct dsa_8021q_context *ctx = ds->tag_8021q_ctx;
|
|
struct dsa_port *dp = dsa_to_port(ds, port);
|
|
u16 vid = dsa_tag_8021q_standalone_vid(dp);
|
|
struct net_device *master;
|
|
int err;
|
|
|
|
/* The CPU port is implicitly configured by
|
|
* configuring the front-panel ports
|
|
*/
|
|
if (!dsa_port_is_user(dp))
|
|
return 0;
|
|
|
|
master = dsa_port_to_master(dp);
|
|
|
|
err = dsa_port_tag_8021q_vlan_add(dp, vid, false);
|
|
if (err) {
|
|
dev_err(ds->dev,
|
|
"Failed to apply standalone VID %d to port %d: %pe\n",
|
|
vid, port, ERR_PTR(err));
|
|
return err;
|
|
}
|
|
|
|
/* Add the VLAN to the master's RX filter. */
|
|
vlan_vid_add(master, ctx->proto, vid);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void dsa_tag_8021q_port_teardown(struct dsa_switch *ds, int port)
|
|
{
|
|
struct dsa_8021q_context *ctx = ds->tag_8021q_ctx;
|
|
struct dsa_port *dp = dsa_to_port(ds, port);
|
|
u16 vid = dsa_tag_8021q_standalone_vid(dp);
|
|
struct net_device *master;
|
|
|
|
/* The CPU port is implicitly configured by
|
|
* configuring the front-panel ports
|
|
*/
|
|
if (!dsa_port_is_user(dp))
|
|
return;
|
|
|
|
master = dsa_port_to_master(dp);
|
|
|
|
dsa_port_tag_8021q_vlan_del(dp, vid, false);
|
|
|
|
vlan_vid_del(master, ctx->proto, vid);
|
|
}
|
|
|
|
static int dsa_tag_8021q_setup(struct dsa_switch *ds)
|
|
{
|
|
int err, port;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
for (port = 0; port < ds->num_ports; port++) {
|
|
err = dsa_tag_8021q_port_setup(ds, port);
|
|
if (err < 0) {
|
|
dev_err(ds->dev,
|
|
"Failed to setup VLAN tagging for port %d: %pe\n",
|
|
port, ERR_PTR(err));
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void dsa_tag_8021q_teardown(struct dsa_switch *ds)
|
|
{
|
|
int port;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
for (port = 0; port < ds->num_ports; port++)
|
|
dsa_tag_8021q_port_teardown(ds, port);
|
|
}
|
|
|
|
int dsa_tag_8021q_register(struct dsa_switch *ds, __be16 proto)
|
|
{
|
|
struct dsa_8021q_context *ctx;
|
|
int err;
|
|
|
|
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
|
|
if (!ctx)
|
|
return -ENOMEM;
|
|
|
|
ctx->proto = proto;
|
|
ctx->ds = ds;
|
|
|
|
INIT_LIST_HEAD(&ctx->vlans);
|
|
|
|
ds->tag_8021q_ctx = ctx;
|
|
|
|
err = dsa_tag_8021q_setup(ds);
|
|
if (err)
|
|
goto err_free;
|
|
|
|
return 0;
|
|
|
|
err_free:
|
|
kfree(ctx);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dsa_tag_8021q_register);
|
|
|
|
void dsa_tag_8021q_unregister(struct dsa_switch *ds)
|
|
{
|
|
struct dsa_8021q_context *ctx = ds->tag_8021q_ctx;
|
|
struct dsa_tag_8021q_vlan *v, *n;
|
|
|
|
dsa_tag_8021q_teardown(ds);
|
|
|
|
list_for_each_entry_safe(v, n, &ctx->vlans, list) {
|
|
list_del(&v->list);
|
|
kfree(v);
|
|
}
|
|
|
|
ds->tag_8021q_ctx = NULL;
|
|
|
|
kfree(ctx);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dsa_tag_8021q_unregister);
|
|
|
|
struct sk_buff *dsa_8021q_xmit(struct sk_buff *skb, struct net_device *netdev,
|
|
u16 tpid, u16 tci)
|
|
{
|
|
/* skb->data points at the MAC header, which is fine
|
|
* for vlan_insert_tag().
|
|
*/
|
|
return vlan_insert_tag(skb, htons(tpid), tci);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dsa_8021q_xmit);
|
|
|
|
struct net_device *dsa_tag_8021q_find_port_by_vbid(struct net_device *master,
|
|
int vbid)
|
|
{
|
|
struct dsa_port *cpu_dp = master->dsa_ptr;
|
|
struct dsa_switch_tree *dst = cpu_dp->dst;
|
|
struct dsa_port *dp;
|
|
|
|
if (WARN_ON(!vbid))
|
|
return NULL;
|
|
|
|
dsa_tree_for_each_user_port(dp, dst) {
|
|
if (!dp->bridge)
|
|
continue;
|
|
|
|
if (dp->stp_state != BR_STATE_LEARNING &&
|
|
dp->stp_state != BR_STATE_FORWARDING)
|
|
continue;
|
|
|
|
if (dp->cpu_dp != cpu_dp)
|
|
continue;
|
|
|
|
if (dsa_port_bridge_num_get(dp) == vbid)
|
|
return dp->slave;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dsa_tag_8021q_find_port_by_vbid);
|
|
|
|
void dsa_8021q_rcv(struct sk_buff *skb, int *source_port, int *switch_id,
|
|
int *vbid)
|
|
{
|
|
u16 vid, tci;
|
|
|
|
if (skb_vlan_tag_present(skb)) {
|
|
tci = skb_vlan_tag_get(skb);
|
|
__vlan_hwaccel_clear_tag(skb);
|
|
} else {
|
|
skb_push_rcsum(skb, ETH_HLEN);
|
|
__skb_vlan_pop(skb, &tci);
|
|
skb_pull_rcsum(skb, ETH_HLEN);
|
|
}
|
|
|
|
vid = tci & VLAN_VID_MASK;
|
|
|
|
*source_port = dsa_8021q_rx_source_port(vid);
|
|
*switch_id = dsa_8021q_rx_switch_id(vid);
|
|
|
|
if (vbid)
|
|
*vbid = dsa_tag_8021q_rx_vbid(vid);
|
|
|
|
skb->priority = (tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dsa_8021q_rcv);
|