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Date:   Wed,  2 Sep 2020 12:28:05 -0700
From:   Xie He <>
To:     Krzysztof Halasa <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,,
Cc:     Xie He <>, Martin Schiller <>
Subject: [PATCH net v2] drivers/net/wan/hdlc: Change the default of hard_header_len to 0

Change the default value of hard_header_len in hdlc.c from 16 to 0.

Currently there are 6 HDLC protocol drivers. Among them:

hdlc_raw_eth, hdlc_cisco, hdlc_ppp, hdlc_x25 set hard_header_len when
attaching the protocol, overriding the default. So this patch does not
affect them.

hdlc_raw and hdlc_fr don't set hard_header_len when attaching the
protocol. So this patch will change the hard_header_len of the HDLC
device for them from 16 to 0.

This is the correct change because both hdlc_raw and hdlc_fr don't have
header_ops, and the code in net/packet/af_packet.c expects the value of
hard_header_len to be consistent with header_ops.

In net/packet/af_packet.c, in the packet_snd function,
for AF_PACKET/DGRAM sockets it would reserve a headroom of
hard_header_len and call dev_hard_header to fill in that headroom,
and for AF_PACKET/RAW sockets, it does not reserve the headroom and
does not call dev_hard_header, but checks if the user has provided a
header of length hard_header_len (in function dev_validate_header).

Cc: Krzysztof Halasa <>
Cc: Martin Schiller <>
Signed-off-by: Xie He <>

Change from v1:
Small fix for the English grammar in the commit message.

 drivers/net/wan/hdlc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wan/hdlc.c b/drivers/net/wan/hdlc.c
index 386ed2aa31fd..9b00708676cf 100644
--- a/drivers/net/wan/hdlc.c
+++ b/drivers/net/wan/hdlc.c
@@ -229,7 +229,7 @@ static void hdlc_setup_dev(struct net_device *dev)
 	dev->min_mtu		 = 68;
 	dev->max_mtu		 = HDLC_MAX_MTU;
 	dev->type		 = ARPHRD_RAWHDLC;
-	dev->hard_header_len	 = 16;
+	dev->hard_header_len	 = 0;
 	dev->needed_headroom	 = 0;
 	dev->addr_len		 = 0;
 	dev->header_ops		 = &hdlc_null_ops;

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