Merge branch 'rmnet-Configuration-options'

Subash Abhinov Kasiviswanathan says:

====================
net: qualcomm: rmnet: Configuration options

This series adds support for configuring features on rmnet devices.
The rmnet specific features to be configured here are aggregation and
control commands.

Patch 1 is a cleanup of return codes in the transmit path.
Patch 2 removes some redundant ingress and egress macros.
Patch 3 restricts the creation of rmnet dev to one dev per mux id for a
given real dev.
Patch 4 adds ethernet data path support.
Patches 5-6 add support for configuring features on new and existing
rmnet devices.

v1->v2:
The memory leak fixed as part of patch 1 is merged seperately as
a896d94abd2c ("net: qualcomm: rmnet: Fix leak on transmit failure").
Fix a use after free in patch 4 if a packet with headroom lesser than ethernet
header length is received.

v2->v3:
Fix formatting problem in patch 5 in the return statement.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c

@@ -143,11 +143,7 @@ static int rmnet_newlink(struct net *src_net, struct net_device *dev,
 			 struct nlattr *tb[], struct nlattr *data[],
 			 struct netlink_ext_ack *extack)
 {
-	int ingress_format = RMNET_INGRESS_FORMAT_DEMUXING |
-			     RMNET_INGRESS_FORMAT_DEAGGREGATION |
-			     RMNET_INGRESS_FORMAT_MAP;
-	int egress_format = RMNET_EGRESS_FORMAT_MUXING |
-			    RMNET_EGRESS_FORMAT_MAP;
+	int ingress_format = RMNET_INGRESS_FORMAT_DEAGGREGATION;
 	struct net_device *real_dev;
 	int mode = RMNET_EPMODE_VND;
 	struct rmnet_endpoint *ep;
@@ -181,13 +177,20 @@ static int rmnet_newlink(struct net *src_net, struct net_device *dev,
 	if (err)
 		goto err2;
 
-	netdev_dbg(dev, "data format [ingress 0x%08X] [egress 0x%08X]\n",
-		   ingress_format, egress_format);
-	port->egress_data_format = egress_format;
-	port->ingress_data_format = ingress_format;
 	port->rmnet_mode = mode;
 
 	hlist_add_head_rcu(&ep->hlnode, &port->muxed_ep[mux_id]);
+
+	if (data[IFLA_VLAN_FLAGS]) {
+		struct ifla_vlan_flags *flags;
+
+		flags = nla_data(data[IFLA_VLAN_FLAGS]);
+		ingress_format = flags->flags & flags->mask;
+	}
+
+	netdev_dbg(dev, "data format [ingress 0x%08X]\n", ingress_format);
+	port->ingress_data_format = ingress_format;
+
 	return 0;
 
 err2:
@@ -317,9 +320,49 @@ static int rmnet_rtnl_validate(struct nlattr *tb[], struct nlattr *data[],
 	return 0;
 }
 
+static int rmnet_changelink(struct net_device *dev, struct nlattr *tb[],
+			    struct nlattr *data[],
+			    struct netlink_ext_ack *extack)
+{
+	struct rmnet_priv *priv = netdev_priv(dev);
+	struct net_device *real_dev;
+	struct rmnet_endpoint *ep;
+	struct rmnet_port *port;
+	u16 mux_id;
+
+	real_dev = __dev_get_by_index(dev_net(dev),
+				      nla_get_u32(tb[IFLA_LINK]));
+
+	if (!real_dev || !dev || !rmnet_is_real_dev_registered(real_dev))
+		return -ENODEV;
+
+	port = rmnet_get_port_rtnl(real_dev);
+
+	if (data[IFLA_VLAN_ID]) {
+		mux_id = nla_get_u16(data[IFLA_VLAN_ID]);
+		ep = rmnet_get_endpoint(port, priv->mux_id);
+
+		hlist_del_init_rcu(&ep->hlnode);
+		hlist_add_head_rcu(&ep->hlnode, &port->muxed_ep[mux_id]);
+
+		ep->mux_id = mux_id;
+		priv->mux_id = mux_id;
+	}
+
+	if (data[IFLA_VLAN_FLAGS]) {
+		struct ifla_vlan_flags *flags;
+
+		flags = nla_data(data[IFLA_VLAN_FLAGS]);
+		port->ingress_data_format = flags->flags & flags->mask;
+	}
+
+	return 0;
+}
+
 static size_t rmnet_get_size(const struct net_device *dev)
 {
-	return nla_total_size(2); /* IFLA_VLAN_ID */
+	return nla_total_size(2) /* IFLA_VLAN_ID */ +
+	       nla_total_size(sizeof(struct ifla_vlan_flags)); /* IFLA_VLAN_FLAGS */
 }
 
 struct rtnl_link_ops rmnet_link_ops __read_mostly = {
@@ -331,6 +374,7 @@ struct rtnl_link_ops rmnet_link_ops __read_mostly = {
 	.newlink	= rmnet_newlink,
 	.dellink	= rmnet_dellink,
 	.get_size	= rmnet_get_size,
+	.changelink     = rmnet_changelink,
 };
 
 /* Needs either rcu_read_lock() or rtnl lock */

drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h

@@ -33,7 +33,6 @@ struct rmnet_endpoint {
 struct rmnet_port {
 	struct net_device *dev;
 	u32 ingress_data_format;
-	u32 egress_data_format;
 	u8 nr_rmnet_devs;
 	u8 rmnet_mode;
 	struct hlist_head muxed_ep[RMNET_MAX_LOGICAL_EP];

drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c

@@ -15,6 +15,7 @@
 
 #include <linux/netdevice.h>
 #include <linux/netdev_features.h>
+#include <linux/if_arp.h>
 #include "rmnet_private.h"
 #include "rmnet_config.h"
 #include "rmnet_vnd.h"
@@ -104,6 +105,15 @@ rmnet_map_ingress_handler(struct sk_buff *skb,
 {
 	struct sk_buff *skbn;
 
+	if (skb->dev->type == ARPHRD_ETHER) {
+		if (pskb_expand_head(skb, ETH_HLEN, 0, GFP_KERNEL)) {
+			kfree_skb(skb);
+			return;
+		}
+
+		skb_push(skb, ETH_HLEN);
+	}
+
 	if (port->ingress_data_format & RMNET_INGRESS_FORMAT_DEAGGREGATION) {
 		while ((skbn = rmnet_map_deaggregate(skb)) != NULL)
 			__rmnet_map_ingress_handler(skbn, port);
@@ -133,20 +143,18 @@ static int rmnet_map_egress_handler(struct sk_buff *skb,
 	if (!map_header)
 		goto fail;
 
-	if (port->egress_data_format & RMNET_EGRESS_FORMAT_MUXING) {
 	if (mux_id == 0xff)
 		map_header->mux_id = 0;
 	else
 		map_header->mux_id = mux_id;
-	}
 
 	skb->protocol = htons(ETH_P_MAP);
 
-	return RMNET_MAP_SUCCESS;
+	return 0;
 
 fail:
 	kfree_skb(skb);
-	return RMNET_MAP_CONSUMED;
+	return -ENOMEM;
 }
 
 static void
@@ -178,7 +186,6 @@ rx_handler_result_t rmnet_rx_handler(struct sk_buff **pskb)
 
 	switch (port->rmnet_mode) {
 	case RMNET_EPMODE_VND:
-		if (port->ingress_data_format & RMNET_INGRESS_FORMAT_MAP)
 		rmnet_map_ingress_handler(skb, port);
 		break;
 	case RMNET_EPMODE_BRIDGE:
@@ -212,20 +219,9 @@ void rmnet_egress_handler(struct sk_buff *skb)
 		return;
 	}
 
-	if (port->egress_data_format & RMNET_EGRESS_FORMAT_MAP) {
-		switch (rmnet_map_egress_handler(skb, port, mux_id, orig_dev)) {
-		case RMNET_MAP_CONSUMED:
+	if (rmnet_map_egress_handler(skb, port, mux_id, orig_dev))
 		return;
 
-		case RMNET_MAP_SUCCESS:
-			break;
-
-		default:
-			kfree_skb(skb);
-			return;
-		}
-	}
-
 	rmnet_vnd_tx_fixup(skb, orig_dev);
 
 	dev_queue_xmit(skb);

drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h

@@ -30,15 +30,6 @@ struct rmnet_map_control_command {
 	};
 }  __aligned(1);
 
-enum rmnet_map_results {
-	RMNET_MAP_SUCCESS,
-	RMNET_MAP_CONSUMED,
-	RMNET_MAP_GENERAL_FAILURE,
-	RMNET_MAP_NOT_ENABLED,
-	RMNET_MAP_FAILED_AGGREGATION,
-	RMNET_MAP_FAILED_MUX
-};
-
 enum rmnet_map_commands {
 	RMNET_MAP_COMMAND_NONE,
 	RMNET_MAP_COMMAND_FLOW_DISABLE,

drivers/net/ethernet/qualcomm/rmnet/rmnet_private.h

@@ -19,14 +19,8 @@
 #define RMNET_TX_QUEUE_LEN         1000
 
 /* Constants */
-#define RMNET_EGRESS_FORMAT_MAP                 BIT(1)
-#define RMNET_EGRESS_FORMAT_AGGREGATION         BIT(2)
-#define RMNET_EGRESS_FORMAT_MUXING              BIT(3)
-
-#define RMNET_INGRESS_FORMAT_MAP                BIT(1)
-#define RMNET_INGRESS_FORMAT_DEAGGREGATION      BIT(2)
-#define RMNET_INGRESS_FORMAT_DEMUXING           BIT(3)
-#define RMNET_INGRESS_FORMAT_MAP_COMMANDS       BIT(4)
+#define RMNET_INGRESS_FORMAT_DEAGGREGATION      BIT(0)
+#define RMNET_INGRESS_FORMAT_MAP_COMMANDS       BIT(1)
 
 /* Replace skb->dev to a virtual rmnet device and pass up the stack */
 #define RMNET_EPMODE_VND (1)

drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c

@@ -185,6 +185,9 @@ int rmnet_vnd_newlink(u8 id, struct net_device *rmnet_dev,
 	if (ep->egress_dev)
 		return -EINVAL;
 
+	if (rmnet_get_endpoint(port, id))
+		return -EBUSY;
+
 	rc = register_netdevice(rmnet_dev);
 	if (!rc) {
 		ep->egress_dev = rmnet_dev;