Merge branch 'bonding-support-new-xfrm-state-offload-functions'

Hangbin Liu says:

====================
Bonding: support new xfrm state offload functions

Add 2 new xfrm state offload functions xdo_dev_state_advance_esn and
xdo_dev_state_update_stats for bonding. The xdo_dev_state_free will be
added by Jianbo's patchset [1]. I will add the bonding xfrm policy offload
in future.

v7: no update, just rebase the code.
v6: Use "Return: " based on ./scripts/kernel-doc (Simon Horman)
v5: Rebase to latest net-next, update function doc (Jakub Kicinski)
v4: Ratelimit pr_warn (Sabrina Dubroca)
v3: Re-format bond_ipsec_dev, use slave_warn instead of WARN_ON (Nikolay Aleksandrov)
    Fix bond_ipsec_dev defination, add *. (Simon Horman, kernel test robot)
    Fix "real" typo (kernel test robot)
v2: Add a function to process the common device checking (Nikolay Aleksandrov)
    Remove unused variable (Simon Horman)
v1: lore.kernel.org/netdev/20240816035518.203704-1-liuhangbin@gmail.com
====================

Link: https://patch.msgid.link/20240904003457.3847086-1-liuhangbin@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/bonding/bond_main.c

@@ -418,6 +418,41 @@ static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 /*---------------------------------- XFRM -----------------------------------*/
 
 #ifdef CONFIG_XFRM_OFFLOAD
+/**
+ * bond_ipsec_dev - Get active device for IPsec offload
+ * @xs: pointer to transformer state struct
+ *
+ * Context: caller must hold rcu_read_lock.
+ *
+ * Return: the device for ipsec offload, or NULL if not exist.
+ **/
+static struct net_device *bond_ipsec_dev(struct xfrm_state *xs)
+{
+	struct net_device *bond_dev = xs->xso.dev;
+	struct bonding *bond;
+	struct slave *slave;
+
+	if (!bond_dev)
+		return NULL;
+
+	bond = netdev_priv(bond_dev);
+	if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
+		return NULL;
+
+	slave = rcu_dereference(bond->curr_active_slave);
+	if (!slave)
+		return NULL;
+
+	if (!xs->xso.real_dev)
+		return NULL;
+
+	if (xs->xso.real_dev != slave->dev)
+		pr_warn_ratelimited("%s: (slave %s): not same with IPsec offload real dev %s\n",
+				    bond_dev->name, slave->dev->name, xs->xso.real_dev->name);
+
+	return slave->dev;
+}
+
 /**
  * bond_ipsec_add_sa - program device with a security association
  * @xs: pointer to transformer state struct
@@ -640,23 +675,12 @@ static void bond_ipsec_free_sa(struct xfrm_state *xs)
  **/
 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
 {
-	struct net_device *bond_dev = xs->xso.dev;
 	struct net_device *real_dev;
-	struct slave *curr_active;
-	struct bonding *bond;
 	bool ok = false;
 
-	bond = netdev_priv(bond_dev);
 	rcu_read_lock();
-	curr_active = rcu_dereference(bond->curr_active_slave);
-	if (!curr_active)
-		goto out;
-	real_dev = curr_active->dev;
-
-	if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
-		goto out;
-
-	if (!xs->xso.real_dev)
+	real_dev = bond_ipsec_dev(xs);
+	if (!real_dev)
 		goto out;
 
 	if (!real_dev->xfrmdev_ops ||
@@ -670,11 +694,61 @@ static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
 	return ok;
 }
 
+/**
+ * bond_advance_esn_state - ESN support for IPSec HW offload
+ * @xs: pointer to transformer state struct
+ **/
+static void bond_advance_esn_state(struct xfrm_state *xs)
+{
+	struct net_device *real_dev;
+
+	rcu_read_lock();
+	real_dev = bond_ipsec_dev(xs);
+	if (!real_dev)
+		goto out;
+
+	if (!real_dev->xfrmdev_ops ||
+	    !real_dev->xfrmdev_ops->xdo_dev_state_advance_esn) {
+		pr_warn_ratelimited("%s: %s doesn't support xdo_dev_state_advance_esn\n", __func__, real_dev->name);
+		goto out;
+	}
+
+	real_dev->xfrmdev_ops->xdo_dev_state_advance_esn(xs);
+out:
+	rcu_read_unlock();
+}
+
+/**
+ * bond_xfrm_update_stats - Update xfrm state
+ * @xs: pointer to transformer state struct
+ **/
+static void bond_xfrm_update_stats(struct xfrm_state *xs)
+{
+	struct net_device *real_dev;
+
+	rcu_read_lock();
+	real_dev = bond_ipsec_dev(xs);
+	if (!real_dev)
+		goto out;
+
+	if (!real_dev->xfrmdev_ops ||
+	    !real_dev->xfrmdev_ops->xdo_dev_state_update_stats) {
+		pr_warn_ratelimited("%s: %s doesn't support xdo_dev_state_update_stats\n", __func__, real_dev->name);
+		goto out;
+	}
+
+	real_dev->xfrmdev_ops->xdo_dev_state_update_stats(xs);
+out:
+	rcu_read_unlock();
+}
+
 static const struct xfrmdev_ops bond_xfrmdev_ops = {
 	.xdo_dev_state_add = bond_ipsec_add_sa,
 	.xdo_dev_state_delete = bond_ipsec_del_sa,
 	.xdo_dev_state_free = bond_ipsec_free_sa,
 	.xdo_dev_offload_ok = bond_ipsec_offload_ok,
+	.xdo_dev_state_advance_esn = bond_advance_esn_state,
+	.xdo_dev_state_update_stats = bond_xfrm_update_stats,
 };
 #endif /* CONFIG_XFRM_OFFLOAD */