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vxlan: Create wrappers for FDB lookup

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__vxlan_find_mac() is called from both the data path (e.g., during
learning) and the control path (e.g., when replacing an entry). The
function is missing lockdep annotations to make sure that the FDB hash
lock is held during FDB updates.

Rename __vxlan_find_mac() to vxlan_find_mac_rcu() to reflect the fact
that it should be called from an RCU read-side critical section and call
it from vxlan_find_mac() which checks that the FDB hash lock is held.
Change callers to invoke the appropriate function.

Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20250415121143.345227-13-idosch@nvidia.com
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Ido Schimmel 2025-04-15 15:11:40 +03:00 committed by Paolo Abeni
parent 5cde39ea38
commit ebe6420674
1 changed files with 24 additions and 10 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

34
drivers/net/vxlan/vxlan_core.c
View file

@ -409,8 +409,8 @@ static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
}
/* Look up Ethernet address in forwarding table */
static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
const u8 *mac, __be32 vni)
static struct vxlan_fdb *vxlan_find_mac_rcu(struct vxlan_dev *vxlan,
const u8 *mac, __be32 vni)
{
struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
struct vxlan_fdb *f;
@ -434,7 +434,7 @@ static struct vxlan_fdb *vxlan_find_mac_tx(struct vxlan_dev *vxlan,
{
struct vxlan_fdb *f;
f = __vxlan_find_mac(vxlan, mac, vni);
f = vxlan_find_mac_rcu(vxlan, mac, vni);
if (f) {
unsigned long now = jiffies;
@ -445,6 +445,20 @@ static struct vxlan_fdb *vxlan_find_mac_tx(struct vxlan_dev *vxlan,
return f;
}
static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
const u8 *mac, __be32 vni)
{
struct vxlan_fdb *f;
lockdep_assert_held_once(&vxlan->hash_lock);
rcu_read_lock();
f = vxlan_find_mac_rcu(vxlan, mac, vni);
rcu_read_unlock();
return f;
}
/* caller should hold vxlan->hash_lock */
static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
union vxlan_addr *ip, __be16 port,
@ -480,7 +494,7 @@ int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
rcu_read_lock();
f = __vxlan_find_mac(vxlan, eth_addr, vni);
f = vxlan_find_mac_rcu(vxlan, eth_addr, vni);
if (!f) {
rc = -ENOENT;
goto out;
@ -1117,7 +1131,7 @@ int vxlan_fdb_update(struct vxlan_dev *vxlan,
{
struct vxlan_fdb *f;
f = __vxlan_find_mac(vxlan, mac, src_vni);
f = vxlan_find_mac(vxlan, mac, src_vni);
if (f) {
if (flags & NLM_F_EXCL) {
netdev_dbg(vxlan->dev,
@ -1286,7 +1300,7 @@ int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
struct vxlan_fdb *f;
int err = -ENOENT;
f = __vxlan_find_mac(vxlan, addr, src_vni);
f = vxlan_find_mac(vxlan, addr, src_vni);
if (!f)
return err;
@ -1409,7 +1423,7 @@ static int vxlan_fdb_get(struct sk_buff *skb,
rcu_read_lock();
f = __vxlan_find_mac(vxlan, addr, vni);
f = vxlan_find_mac_rcu(vxlan, addr, vni);
if (!f) {
NL_SET_ERR_MSG(extack, "Fdb entry not found");
err = -ENOENT;
@ -1445,7 +1459,7 @@ static enum skb_drop_reason vxlan_snoop(struct net_device *dev,
ifindex = src_ifindex;
#endif
f = __vxlan_find_mac(vxlan, src_mac, vni);
f = vxlan_find_mac_rcu(vxlan, src_mac, vni);
if (likely(f)) {
struct vxlan_rdst *rdst = first_remote_rcu(f);
unsigned long now = jiffies;
@ -4727,7 +4741,7 @@ vxlan_fdb_offloaded_set(struct net_device *dev,
spin_lock_bh(&vxlan->hash_lock);
f = __vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
if (!f)
goto out;
@ -4779,7 +4793,7 @@ vxlan_fdb_external_learn_del(struct net_device *dev,
spin_lock_bh(&vxlan->hash_lock);
f = __vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
if (!f)
err = -ENOENT;
else if (f->flags & NTF_EXT_LEARNED)