From: Xie He <xie.he.0141@gmail.com>
To: "David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-x25@vger.kernel.org
Cc: Xie He <xie.he.0141@gmail.com>, Martin Schiller <ms@dev.tdt.de>
Subject: [PATCH net] drivers/net/wan/lapbether: Set network_header before transmitting
Date: Tue, 25 Aug 2020 20:03:53 -0700 [thread overview]
Message-ID: <20200826030353.75645-1-xie.he.0141@gmail.com> (raw)
Set the skb's network_header before it is passed to the underlying
Ethernet device for transmission.
This patch fixes the following issue:
When we use this driver with AF_PACKET sockets, there would be error
messages of:
protocol 0805 is buggy, dev (Ethernet interface name)
printed in the system "dmesg" log.
This is because skbs passed down to the Ethernet device for transmission
don't have their network_header properly set, and the dev_queue_xmit_nit
function in net/core/dev.c complains about this.
Reason of setting the network_header to this place (at the end of the
Ethernet header, and at the beginning of the Ethernet payload):
Because when this driver receives an skb from the Ethernet device, the
network_header is also set at this place.
Cc: Martin Schiller <ms@dev.tdt.de>
Signed-off-by: Xie He <xie.he.0141@gmail.com>
---
drivers/net/wan/lapbether.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/net/wan/lapbether.c b/drivers/net/wan/lapbether.c
index cc297ea9c6ec..e61616b0b91c 100644
--- a/drivers/net/wan/lapbether.c
+++ b/drivers/net/wan/lapbether.c
@@ -210,6 +210,8 @@ static void lapbeth_data_transmit(struct net_device *ndev, struct sk_buff *skb)
skb->dev = dev = lapbeth->ethdev;
+ skb_reset_network_header(skb);
+
dev_hard_header(skb, dev, ETH_P_DEC, bcast_addr, NULL, 0);
dev_queue_xmit(skb);
--
2.25.1
next reply other threads:[~2020-08-26 3:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-26 3:03 Xie He [this message]
2020-08-26 22:51 ` [PATCH net] drivers/net/wan/lapbether: Set network_header before transmitting David Miller
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