[PATCH v7 net-next 4/9] net: switchdev: support offloading of the FDB blackhole flag

From: Hans J. Schultz
Date: Sun Oct 09 2022 - 13:41:50 EST

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Add support for offloading of the FDB blackhole flag.

Signed-off-by: Hans J. Schultz <netdev@xxxxxxxxxxxxxxxxxxxx>
---
include/net/dsa.h | 1 +
include/net/switchdev.h | 1 +
net/bridge/br.c | 3 ++-
net/bridge/br_fdb.c | 19 ++++++++++++++++---
net/bridge/br_private.h | 3 ++-
net/bridge/br_switchdev.c | 1 +
net/dsa/dsa_priv.h | 4 ++--
net/dsa/port.c | 22 ++++++++++++----------
net/dsa/slave.c | 6 ++++--
9 files changed, 41 insertions(+), 19 deletions(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index e4b641b20713..d5b2aef52d93 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -822,6 +822,7 @@ static inline bool dsa_port_tree_same(const struct dsa_port *a,
}

#define DSA_FDB_FLAG_LOCKED (1 << 0)
+#define DSA_FDB_FLAG_BLACKHOLE (1 << 1)

typedef int dsa_fdb_dump_cb_t(const unsigned char *addr, u16 vid,
bool is_static, void *data);
diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index ca0312b78294..39727902354e 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -249,6 +249,7 @@ struct switchdev_notifier_fdb_info {
u8 added_by_user:1,
is_local:1,
locked:1,
+ blackhole:1,
offloaded:1;
};

diff --git a/net/bridge/br.c b/net/bridge/br.c
index e0e2df2fa278..85fc529b6a9f 100644
--- a/net/bridge/br.c
+++ b/net/bridge/br.c
@@ -166,7 +166,8 @@ static int br_switchdev_event(struct notifier_block *unused,
case SWITCHDEV_FDB_ADD_TO_BRIDGE:
fdb_info = ptr;
err = br_fdb_external_learn_add(br, p, fdb_info->addr, fdb_info->vid,
- fdb_info->locked, false);
+ fdb_info->locked, fdb_info->is_local,
+ fdb_info->blackhole, false);
if (err) {
err = notifier_from_errno(err);
break;
diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 86fa60cbc26c..d6f22e2e018a 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -1148,7 +1148,7 @@ static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br,
"FDB entry towards bridge must be permanent");
return -EINVAL;
}
- err = br_fdb_external_learn_add(br, p, addr, vid, false, true);
+ err = br_fdb_external_learn_add(br, p, addr, vid, false, false, false, true);
} else if ((ext_flags & NTF_EXT_BLACKHOLE) && p) {
NL_SET_ERR_MSG_MOD(extack, "Blackhole FDB entry cannot be applied on a port");
return -EINVAL;
@@ -1390,7 +1390,7 @@ void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)

int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
const unsigned char *addr, u16 vid, bool locked,
- bool swdev_notify)
+ bool local, bool blackhole, bool swdev_notify)
{
struct net_bridge_fdb_entry *fdb;
bool modified = false;
@@ -1407,12 +1407,15 @@ int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
if (swdev_notify)
flags |= BIT(BR_FDB_ADDED_BY_USER);

- if (!p)
+ if (!p || local)
flags |= BIT(BR_FDB_LOCAL);

if (locked)
flags |= BIT(BR_FDB_LOCKED);

+ if (blackhole)
+ flags |= BIT(BR_FDB_BLACKHOLE);
+
fdb = fdb_create(br, p, addr, vid, flags);
if (!fdb) {
err = -ENOMEM;
@@ -1436,11 +1439,21 @@ int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
modified = true;
}

+ if (local != test_bit(BR_FDB_LOCAL, &fdb->flags)) {
+ change_bit(BR_FDB_LOCAL, &fdb->flags);
+ modified = true;
+ }
+
if (locked != test_bit(BR_FDB_LOCKED, &fdb->flags)) {
change_bit(BR_FDB_LOCKED, &fdb->flags);
modified = true;
}

+ if (blackhole != test_bit(BR_FDB_BLACKHOLE, &fdb->flags)) {
+ change_bit(BR_FDB_BLACKHOLE, &fdb->flags);
+ modified = true;
+ }
+
if (swdev_notify)
set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);

diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 3e9f4d1fbd60..4202c80e465e 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -812,7 +812,8 @@ int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
const unsigned char *addr, u16 vid,
- bool locked, bool swdev_notify);
+ bool locked, bool local, bool blackhole,
+ bool swdev_notify);
int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
const unsigned char *addr, u16 vid,
bool swdev_notify);
diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
index ccf1b4cffdd0..ce7b80c782ec 100644
--- a/net/bridge/br_switchdev.c
+++ b/net/bridge/br_switchdev.c
@@ -137,6 +137,7 @@ static void br_switchdev_fdb_populate(struct net_bridge *br,
item->offloaded = test_bit(BR_FDB_OFFLOADED, &fdb->flags);
item->is_local = test_bit(BR_FDB_LOCAL, &fdb->flags);
item->locked = test_bit(BR_FDB_LOCKED, &fdb->flags);
+ item->blackhole = test_bit(BR_FDB_BLACKHOLE, &fdb->flags);
item->info.dev = (!p || item->is_local) ? br->dev : p->dev;
item->info.ctx = ctx;
}
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index c943e8934063..611833f162d1 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -251,9 +251,9 @@ int dsa_port_standalone_host_fdb_add(struct dsa_port *dp,
int dsa_port_standalone_host_fdb_del(struct dsa_port *dp,
const unsigned char *addr, u16 vid);
int dsa_port_bridge_host_fdb_add(struct dsa_port *dp, const unsigned char *addr,
- u16 vid);
+ u16 vid, u16 fdb_flags);
int dsa_port_bridge_host_fdb_del(struct dsa_port *dp, const unsigned char *addr,
- u16 vid);
+ u16 vid, u16 fdb_flags);
int dsa_port_lag_fdb_add(struct dsa_port *dp, const unsigned char *addr,
u16 vid);
int dsa_port_lag_fdb_del(struct dsa_port *dp, const unsigned char *addr,
diff --git a/net/dsa/port.c b/net/dsa/port.c
index eab32b7a945a..e4a79fd4a99e 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -1001,12 +1001,13 @@ int dsa_port_fdb_del(struct dsa_port *dp, const unsigned char *addr,

static int dsa_port_host_fdb_add(struct dsa_port *dp,
const unsigned char *addr, u16 vid,
- struct dsa_db db)
+ u16 fdb_flags, struct dsa_db db)
{
struct dsa_notifier_fdb_info info = {
.dp = dp,
.addr = addr,
.vid = vid,
+ .fdb_flags = fdb_flags,
.db = db,
};

@@ -1024,11 +1025,11 @@ int dsa_port_standalone_host_fdb_add(struct dsa_port *dp,
.dp = dp,
};

- return dsa_port_host_fdb_add(dp, addr, vid, db);
+ return dsa_port_host_fdb_add(dp, addr, vid, 0, db);
}

-int dsa_port_bridge_host_fdb_add(struct dsa_port *dp,
- const unsigned char *addr, u16 vid)
+int dsa_port_bridge_host_fdb_add(struct dsa_port *dp, const unsigned char *addr,
+ u16 vid, u16 fdb_flags)
{
struct net_device *master = dsa_port_to_master(dp);
struct dsa_db db = {
@@ -1047,17 +1048,18 @@ int dsa_port_bridge_host_fdb_add(struct dsa_port *dp,
return err;
}

- return dsa_port_host_fdb_add(dp, addr, vid, db);
+ return dsa_port_host_fdb_add(dp, addr, vid, fdb_flags, db);
}

static int dsa_port_host_fdb_del(struct dsa_port *dp,
const unsigned char *addr, u16 vid,
- struct dsa_db db)
+ u16 fdb_flags, struct dsa_db db)
{
struct dsa_notifier_fdb_info info = {
.dp = dp,
.addr = addr,
.vid = vid,
+ .fdb_flags = fdb_flags,
.db = db,
};

@@ -1075,11 +1077,11 @@ int dsa_port_standalone_host_fdb_del(struct dsa_port *dp,
.dp = dp,
};

- return dsa_port_host_fdb_del(dp, addr, vid, db);
+ return dsa_port_host_fdb_del(dp, addr, vid, 0, db);
}

-int dsa_port_bridge_host_fdb_del(struct dsa_port *dp,
- const unsigned char *addr, u16 vid)
+int dsa_port_bridge_host_fdb_del(struct dsa_port *dp, const unsigned char *addr,
+ u16 vid, u16 fdb_flags)
{
struct net_device *master = dsa_port_to_master(dp);
struct dsa_db db = {
@@ -1094,7 +1096,7 @@ int dsa_port_bridge_host_fdb_del(struct dsa_port *dp,
return err;
}

- return dsa_port_host_fdb_del(dp, addr, vid, db);
+ return dsa_port_host_fdb_del(dp, addr, vid, fdb_flags, db);
}

int dsa_port_lag_fdb_add(struct dsa_port *dp, const unsigned char *addr,
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 65f0c578ef44..4e22014ec469 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -3258,7 +3258,7 @@ static void dsa_slave_switchdev_event_work(struct work_struct *work)
switch (switchdev_work->event) {
case SWITCHDEV_FDB_ADD_TO_DEVICE:
if (switchdev_work->host_addr)
- err = dsa_port_bridge_host_fdb_add(dp, addr, vid);
+ err = dsa_port_bridge_host_fdb_add(dp, addr, vid, fdb_flags);
else if (dp->lag)
err = dsa_port_lag_fdb_add(dp, addr, vid);
else
@@ -3274,7 +3274,7 @@ static void dsa_slave_switchdev_event_work(struct work_struct *work)

case SWITCHDEV_FDB_DEL_TO_DEVICE:
if (switchdev_work->host_addr)
- err = dsa_port_bridge_host_fdb_del(dp, addr, vid);
+ err = dsa_port_bridge_host_fdb_del(dp, addr, vid, fdb_flags);
else if (dp->lag)
err = dsa_port_lag_fdb_del(dp, addr, vid);
else
@@ -3365,6 +3365,8 @@ static int dsa_slave_fdb_event(struct net_device *dev,

if (fdb_info->locked)
fdb_flags |= DSA_FDB_FLAG_LOCKED;
+ if (fdb_info->blackhole)
+ fdb_flags |= DSA_FDB_FLAG_BLACKHOLE;

INIT_WORK(&switchdev_work->work, dsa_slave_switchdev_event_work);
switchdev_work->event = event;
--
2.34.1

Next message: Hans J. Schultz: "[PATCH v7 net-next 5/9] drivers: net: dsa: add fdb entry flags to drivers"
Previous message: Hans J. Schultz: "[PATCH v7 net-next 3/9] net: switchdev: add support for offloading of the FDB locked flag"
In reply to: netdev: "Re: [PATCH v7 net-next 3/9] net: switchdev: add support for offloading of the FDB locked flag"
Next in thread: Ido Schimmel: "Re: [PATCH v7 net-next 4/9] net: switchdev: support offloading of the FDB blackhole flag"
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