1 files changed, 84 insertions, 1 deletions

diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index 5a05add9b4e6..6c3d8c2abd38 100644
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -57,6 +57,7 @@ struct qmi_wwan_state {
 enum qmi_wwan_flags {
 	QMI_WWAN_FLAG_RAWIP = 1 << 0,
 	QMI_WWAN_FLAG_MUX = 1 << 1,
+	QMI_WWAN_FLAG_PASS_THROUGH = 1 << 2,
 };
 
 enum qmi_wwan_quirks {
@@ -186,7 +187,7 @@ static int qmimux_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 		net = qmimux_find_dev(dev, hdr->mux_id);
 		if (!net)
 			goto skip;
-		skbn = netdev_alloc_skb(net, pkt_len);
+		skbn = netdev_alloc_skb(net, pkt_len + LL_MAX_HEADER);
 		if (!skbn)
 			return 0;
 		skbn->dev = net;
@@ -203,6 +204,7 @@ static int qmimux_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 			goto skip;
 		}
 
+		skb_reserve(skbn, LL_MAX_HEADER);
 		skb_put_data(skbn, skb->data + offset + qmimux_hdr_sz, pkt_len);
 		if (netif_rx(skbn) != NET_RX_SUCCESS) {
 			net->stats.rx_errors++;
@@ -217,6 +219,28 @@ skip:
 	return 1;
 }
 
+static ssize_t mux_id_show(struct device *d, struct device_attribute *attr, char *buf)
+{
+	struct net_device *dev = to_net_dev(d);
+	struct qmimux_priv *priv;
+
+	priv = netdev_priv(dev);
+
+	return sysfs_emit(buf, "0x%02x\n", priv->mux_id);
+}
+
+static DEVICE_ATTR_RO(mux_id);
+
+static struct attribute *qmi_wwan_sysfs_qmimux_attrs[] = {
+	&dev_attr_mux_id.attr,
+	NULL,
+};
+
+static struct attribute_group qmi_wwan_sysfs_qmimux_attr_group = {
+	.name = "qmap",
+	.attrs = qmi_wwan_sysfs_qmimux_attrs,
+};
+
 static int qmimux_register_device(struct net_device *real_dev, u8 mux_id)
 {
 	struct net_device *new_dev;
@@ -239,6 +263,8 @@ static int qmimux_register_device(struct net_device *real_dev, u8 mux_id)
 		goto out_free_newdev;
 	}
 
+	new_dev->sysfs_groups[0] = &qmi_wwan_sysfs_qmimux_attr_group;
+
 	err = register_netdevice(new_dev);
 	if (err < 0)
 		goto out_free_newdev;
@@ -325,6 +351,13 @@ static ssize_t raw_ip_store(struct device *d,  struct device_attribute *attr, co
 	if (enable == (info->flags & QMI_WWAN_FLAG_RAWIP))
 		return len;
 
+	/* ip mode cannot be cleared when pass through mode is set */
+	if (!enable && (info->flags & QMI_WWAN_FLAG_PASS_THROUGH)) {
+		netdev_err(dev->net,
+			   "Cannot clear ip mode on pass through device\n");
+		return -EINVAL;
+	}
+
 	if (!rtnl_trylock())
 		return restart_syscall();
 
@@ -455,14 +488,59 @@ err:
 	return ret;
 }
 
+static ssize_t pass_through_show(struct device *d,
+				 struct device_attribute *attr, char *buf)
+{
+	struct usbnet *dev = netdev_priv(to_net_dev(d));
+	struct qmi_wwan_state *info;
+
+	info = (void *)&dev->data;
+	return sprintf(buf, "%c\n",
+		       info->flags & QMI_WWAN_FLAG_PASS_THROUGH ? 'Y' : 'N');
+}
+
+static ssize_t pass_through_store(struct device *d,
+				  struct device_attribute *attr,
+				  const char *buf, size_t len)
+{
+	struct usbnet *dev = netdev_priv(to_net_dev(d));
+	struct qmi_wwan_state *info;
+	bool enable;
+
+	if (strtobool(buf, &enable))
+		return -EINVAL;
+
+	info = (void *)&dev->data;
+
+	/* no change? */
+	if (enable == (info->flags & QMI_WWAN_FLAG_PASS_THROUGH))
+		return len;
+
+	/* pass through mode can be set for raw ip devices only */
+	if (!(info->flags & QMI_WWAN_FLAG_RAWIP)) {
+		netdev_err(dev->net,
+			   "Cannot set pass through mode on non ip device\n");
+		return -EINVAL;
+	}
+
+	if (enable)
+		info->flags |= QMI_WWAN_FLAG_PASS_THROUGH;
+	else
+		info->flags &= ~QMI_WWAN_FLAG_PASS_THROUGH;
+
+	return len;
+}
+
 static DEVICE_ATTR_RW(raw_ip);
 static DEVICE_ATTR_RW(add_mux);
 static DEVICE_ATTR_RW(del_mux);
+static DEVICE_ATTR_RW(pass_through);
 
 static struct attribute *qmi_wwan_sysfs_attrs[] = {
 	&dev_attr_raw_ip.attr,
 	&dev_attr_add_mux.attr,
 	&dev_attr_del_mux.attr,
+	&dev_attr_pass_through.attr,
 	NULL,
 };
 
@@ -509,6 +587,11 @@ static int qmi_wwan_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 	if (info->flags & QMI_WWAN_FLAG_MUX)
 		return qmimux_rx_fixup(dev, skb);
 
+	if (info->flags & QMI_WWAN_FLAG_PASS_THROUGH) {
+		skb->protocol = htons(ETH_P_MAP);
+		return (netif_rx(skb) == NET_RX_SUCCESS);
+	}
+
 	switch (skb->data[0] & 0xf0) {
 	case 0x40:
 		proto = htons(ETH_P_IP);