linux-kernel - Re: [PATCH net] drivers/net/wan/hdlc_cisco: Add hard_header

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Date:   Fri, 28 Aug 2020 12:37:37 +0200
From:   Krzysztof Hałasa <khalasa@...p.pl>
To:     Xie He <xie.he.0141@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Martin Schiller <ms@....tdt.de>
Subject: Re: [PATCH net] drivers/net/wan/hdlc_cisco: Add hard_header_len

Hello Xie,

Xie He <xie.he.0141@...il.com> writes:

> This driver didn't set hard_header_len. This patch sets hard_header_len
> for it according to its header_ops->create function.

BTW it's 4 bytes long:

struct hdlc_header {
        u8 address;
        u8 control;
        __be16 protocol;
}__packed;

OTOH hdlc_setup_dev() initializes hard_header_len to 16,
but in this case I guess 4 bytes are better.

Acked-by: Krzysztof Halasa <khc@...waw.pl>

> Cc: Martin Schiller <ms@....tdt.de>
> Signed-off-by: Xie He <xie.he.0141@...il.com>
> ---

> --- a/drivers/net/wan/hdlc_cisco.c
> +++ b/drivers/net/wan/hdlc_cisco.c
> @@ -370,6 +370,7 @@ static int cisco_ioctl(struct net_device *dev, struct ifreq *ifr)
>  		memcpy(&state(hdlc)->settings, &new_settings, size);
>  		spin_lock_init(&state(hdlc)->lock);
>  		dev->header_ops = &cisco_header_ops;
> +		dev->hard_header_len = sizeof(struct hdlc_header);
>  		dev->type = ARPHRD_CISCO;
>  		call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
>  		netif_dormant_on(dev);

-- 
Krzysztof Halasa

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