netdev - Re: [PATCH -next] net/ixgbevf: fix a compilation error of skb_frag

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Date:   Wed, 24 Jul 2019 06:59:03 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Qian Cai <cai@....pw>
Cc:     davem@...emloft.net, jeffrey.t.kirsher@...el.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] net/ixgbevf: fix a compilation error of skb_frag_t

On Wed, Jul 24, 2019 at 09:32:37AM -0400, Qian Cai wrote:
>  	for (f = 0; f < skb_shinfo(skb)->nr_frags; f++)
> -		count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size);
> +		count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].bv_len);
>  #else

No, this is the wrong fix.  Use the fine accessor instead:

+		count += TXD_USE_COUNT(skb_frag_size(&skb_shinfo(skb)->frags[f]));

although now there's a line length problem.  Most drivers do:

		skb_frag_t frag = &skb_shinfo(skb)->frags[f];
		count += TXD_USE_COUNT(skb_frag_size(frag));