target/linux/mediatek/patches-5.4/999-4500-mtk-ppp-offload-support.patch

--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -296,6 +296,9 @@ static void unit_put(struct idr *p, int
 static void *unit_find(struct idr *p, int n);
 static void ppp_setup(struct net_device *dev);
 
+struct sock *ppp_netdev_get_sock(struct net_device *dev);
+EXPORT_SYMBOL(ppp_netdev_get_sock);
+
 static const struct net_device_ops ppp_netdev_ops;
 
 static struct class *ppp_class;
@@ -1660,6 +1663,40 @@ ppp_send_frame(struct ppp *ppp, struct s
 	++ppp->dev->stats.tx_errors;
 }
 
+struct sock *ppp_netdev_get_sock(struct net_device *dev)
+{
+	struct list_head *list;
+	struct channel *pch;
+	struct ppp *ppp;
+	struct sock *sk;
+
+	if (!dev)
+		return ERR_PTR(-EINVAL);
+
+	ppp = netdev_priv(dev);
+
+	list = &ppp->channels;
+	if (list_empty(list))
+		 /* nowhere to send the packet */
+		return ERR_PTR(-EINVAL);
+
+	if (ppp->flags & SC_MULTILINK)
+		/* not doing multilink: send it down the first channel */
+		return ERR_PTR(-EPERM);
+
+	list = list->next;
+	pch = list_entry(list, struct channel, clist);
+
+	spin_lock(&pch->downl);
+	if (pch->chan)
+		sk = (struct sock *)pch->chan->private;
+	else
+		sk = ERR_PTR(-EINVAL);
+	spin_unlock(&pch->downl);
+
+	return sk;
+}
+
 /*
  * Try to send the frame in xmit_pending.
  * The caller should have the xmit path locked.
--- a/include/linux/ppp_channel.h
+++ b/include/linux/ppp_channel.h
@@ -75,6 +75,9 @@ extern int ppp_unit_number(struct ppp_ch
 /* Get the device name associated with a channel, or NULL if none */
 extern char *ppp_dev_name(struct ppp_channel *);
 
+/* Get the socket structure of a given ppp netdev */
+extern struct sock *ppp_netdev_get_sock(struct net_device *dev);
+
 /*
  * SMP locking notes:
  * The channel code must ensure that when it calls ppp_unregister_channel,