linux-kernel - Re: [E1000-devel] [PATCH] e1000: remove the check: skb->len<=0

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Message-ID: <CABVvea3GLVqwg7xMG9KhMfqvLxLQ8cE1NDeHXMxoA2+ZG06w4w@mail.gmail.com>
Date:	Wed, 14 May 2014 09:25:21 +0800
From:	徐永健 <xuyongjiande@...il.com>
To:	"Ronciak, John" <john.ronciak@...el.com>
Cc:	"eric.dumazet@...il.com" <eric.dumazet@...il.com>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [E1000-devel] [PATCH] e1000: remove the check: skb->len<=0

The check is not right, it should be "(int)(skb->len) <= 0", or we
just remove this check if "skb->len will never be negative or 0".

2014-05-13 22:57 GMT+08:00 Ronciak, John <john.ronciak@...el.com>:
>> -----Original Message-----
>> From: xuyongjiande@...il.com [mailto:xuyongjiande@...il.com]
>> Sent: Monday, May 12, 2014 10:07 PM
>> To: eric.dumazet@...il.com
>> Cc: e1000-devel@...ts.sourceforge.net; netdev@...r.kernel.org; linux-
>> kernel@...r.kernel.org; Yongjian Xu
>> Subject: [E1000-devel] [PATCH] e1000: remove the check: skb->len<=0
>>
>> From: Yongjian Xu <xuyongjiande@...il.com>
>>
>> There is no case skb->len would be 0 or 'negative'.
>> Remove the check.
>>
>> Signed-off-by: Yongjian Xu <xuyongjiande@...il.com>
>> ---
>>  drivers/net/ethernet/intel/e1000/e1000_main.c | 5 -----
>>  1 file changed, 5 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c
>> b/drivers/net/ethernet/intel/e1000/e1000_main.c
>> index 27058df..660971f 100644
>> --- a/drivers/net/ethernet/intel/e1000/e1000_main.c
>> +++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
>> @@ -3105,11 +3105,6 @@ static netdev_tx_t e1000_xmit_frame(struct
>> sk_buff *skb,
>>        */
>>       tx_ring = adapter->tx_ring;
>>
>> -     if (unlikely(skb->len <= 0)) {
>> -             dev_kfree_skb_any(skb);
>> -             return NETDEV_TX_OK;
>> -     }
>> -
>>       /* On PCI/PCI-X HW, if packet size is less than ETH_ZLEN,
>>        * packets may get corrupted during padding by HW.
>>        * To WA this issue, pad all small packets manually.
>> --
>> 1.9.1
> What is the exact problem that this is fixing?  Did you have a test case that showed a problem with it?
>
> Cheers,
> John
>
>
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