netdev - [PATCH net-next v2 4/6] net: qualcomm: rmnet: Process packets over ethernet

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Message-Id: <1512853110-4893-5-git-send-email-subashab@codeaurora.org>
Date:   Sat,  9 Dec 2017 13:58:28 -0700
From:   Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
To:     davem@...emloft.net, netdev@...r.kernel.org
Cc:     Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
Subject: [PATCH net-next v2 4/6] net: qualcomm: rmnet: Process packets over ethernet

Add support to send and receive packets over ethernet.
An example of usage is testing the data path on UML. This can be
achieved by setting up two UML instances in multicast mode and
associating rmnet over the UML ethernet device.

Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
---
 drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
index a46053c..0553932 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
+++ b/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 @@ static void rmnet_set_skb_proto(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);
-- 
1.9.1