linux-kernel - [PATCH v2] net: mhi: Add raw IP mode support

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Date:   Thu, 17 Dec 2020 16:34:09 +0100
From:   Loic Poulain <loic.poulain@...aro.org>
To:     kuba@...nel.org, davem@...emloft.net
Cc:     linux-kernel@...r.kernel.org,
        Loic Poulain <loic.poulain@...aro.org>
Subject: [PATCH v2] net: mhi: Add raw IP mode support

MHI net is protocol agnostic, the payload protocol depends on the modem
configuration, which can be either RMNET (IP muxing and aggregation) or
raw IP. This patch adds support for incomming IPv4/IPv6 packets, that
was previously unconditionnaly reported as RMNET packets.

Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
---
 v2: - mhi-net rebase
     - Set device type to RAWIP

 drivers/net/mhi_net.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mhi_net.c b/drivers/net/mhi_net.c
index e3f9c0d..478e78f 100644
--- a/drivers/net/mhi_net.c
+++ b/drivers/net/mhi_net.c
@@ -121,7 +121,7 @@ static const struct net_device_ops mhi_netdev_ops = {
 static void mhi_net_setup(struct net_device *ndev)
 {
 	ndev->header_ops = NULL;  /* No header */
-	ndev->type = ARPHRD_NONE; /* QMAP... */
+	ndev->type = ARPHRD_RAWIP;
 	ndev->hard_header_len = 0;
 	ndev->addr_len = 0;
 	ndev->flags = IFF_POINTOPOINT | IFF_NOARP;
@@ -157,7 +157,18 @@ static void mhi_net_dl_callback(struct mhi_device *mhi_dev,
 		u64_stats_add(&mhi_netdev->stats.rx_bytes, mhi_res->bytes_xferd);
 		u64_stats_update_end(&mhi_netdev->stats.rx_syncp);
 
-		skb->protocol = htons(ETH_P_MAP);
+		switch (skb->data[0] & 0xf0) {
+		case 0x40:
+			skb->protocol = htons(ETH_P_IP);
+			break;
+		case 0x60:
+			skb->protocol = htons(ETH_P_IPV6);
+			break;
+		default:
+			skb->protocol = htons(ETH_P_MAP);
+			break;
+		}
+
 		skb_put(skb, mhi_res->bytes_xferd);
 		netif_rx(skb);
 	}
-- 
2.7.4