netdev - RE: [PATCH 1/1] AX88179_178A: Add FLAG_HW_IPALIGN to determine whether reserving NET_IP

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Date:	Fri, 13 Dec 2013 10:36:01 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	<freddy@...x.com.tw>, <netdev@...r.kernel.org>,
	<davem@...emloft.net>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <louis@...x.com.tw>,
	<allan@...x.com.tw>
Subject: RE: [PATCH 1/1] AX88179_178A: Add FLAG_HW_IPALIGN to determine whether reserving NET_IP_ALIGN bytes for an SKB.

> From: freddy@...x.com.tw
...
> -	skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
> +	if (dev->driver_info->flags & FLAG_HW_IPALIGN)
> +		skb = __netdev_alloc_skb(dev->net, size, flags);
> +	else
> +		skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);

Given the definition:
static inline struct sk_buff *__netdev_alloc_skb_ip_align(struct net_device *dev,
                unsigned int length, gfp_t gfp)
{
        struct sk_buff *skb = __netdev_alloc_skb(dev, length + NET_IP_ALIGN, gfp);

        if (NET_IP_ALIGN && skb)
                skb_reserve(skb, NET_IP_ALIGN);
        return skb;
}

It really ought to be possible to code that without an extra conditional.

	David



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