linux-kernel - [PATCH net-next 6/8] ipvlan: Support GSO for port -> ipvlan

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Message-ID: <20251021144410.257905-7-skorodumov.dmitry@huawei.com>
Date: Tue, 21 Oct 2025 17:44:08 +0300
From: Dmitry Skorodumov <skorodumov.dmitry@...wei.com>
To: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <andrey.bokhanko@...wei.com>, Dmitry Skorodumov
	<skorodumov.dmitry@...wei.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David
 S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub
 Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next 6/8] ipvlan: Support GSO for port -> ipvlan

If main port interface supports GSO, we need manually segment
the skb before forwarding it to ipvlan interface.

Signed-off-by: Dmitry Skorodumov <skorodumov.dmitry@...wei.com>
---
 drivers/net/ipvlan/ipvlan_main.c | 50 ++++++++++++++++++++++++--------
 1 file changed, 38 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c
index 28ce36669d39..f1b1f91f94c0 100644
--- a/drivers/net/ipvlan/ipvlan_main.c
+++ b/drivers/net/ipvlan/ipvlan_main.c
@@ -4,6 +4,7 @@
 
 #include <linux/ethtool.h>
 #include <net/netdev_lock.h>
+#include <net/gso.h>
 
 #include "ipvlan.h"
 
@@ -76,6 +77,41 @@ static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval,
 	return err;
 }
 
+static int ipvlan_receive(struct ipvl_dev *ipvlan, struct sk_buff *skb)
+{
+	struct sk_buff *segs;
+	struct sk_buff *nskb;
+	ssize_t mac_hdr_size;
+	int ret, len;
+
+	skb->pkt_type = PACKET_HOST;
+	skb->protocol = eth_type_trans(skb, skb->dev);
+	ipvlan_skb_crossing_ns(skb, ipvlan->dev);
+	ipvlan_mark_skb(skb, ipvlan->phy_dev);
+	if (skb_shinfo(skb)->gso_size == 0) {
+		len = skb->len + ETH_HLEN;
+		ret = netif_rx(skb);
+		ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, false);
+		return ret;
+	}
+
+	mac_hdr_size = skb->network_header - skb->mac_header;
+	__skb_push(skb, mac_hdr_size);
+	segs = skb_gso_segment(skb, 0);
+	dev_kfree_skb(skb);
+	if (IS_ERR(segs))
+		return 0;
+
+	skb_list_walk_safe(segs, segs, nskb) {
+		skb_mark_not_on_list(segs);
+		__skb_pull(segs, mac_hdr_size);
+		len = segs->len + ETH_HLEN;
+		ret = netif_rx(segs);
+		ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, false);
+	}
+	return ret;
+}
+
 static int ipvlan_port_receive(struct sk_buff *skb, struct net_device *wdev,
 			       struct packet_type *pt, struct net_device *orig_wdev)
 {
@@ -115,18 +151,8 @@ static int ipvlan_port_receive(struct sk_buff *skb, struct net_device *wdev,
 		goto out;
 
 	addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
-	if (addr) {
-		int ret, len;
-
-		ipvlan_skb_crossing_ns(skb, addr->master->dev);
-		skb->protocol = eth_type_trans(skb, skb->dev);
-		skb->pkt_type = PACKET_HOST;
-		ipvlan_mark_skb(skb, port->dev);
-		len = skb->len + ETH_HLEN;
-		ret = netif_rx(skb);
-		ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, false);
-		return 0;
-	}
+	if (addr)
+		return ipvlan_receive(addr->master, skb);
 
 out:
 	dev_kfree_skb(skb);
-- 
2.25.1