linux-kernel - Re: [PATCH net-next v4 4/4 RFC] pktgen: Allow sending IPv4 TCP packets

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Date:	Wed, 6 Aug 2014 19:09:40 +0100
From:	Zoltan Kiss <zoltan.kiss@...rix.com>
To:	David Miller <davem@...emloft.net>
CC:	<steffen.klassert@...unet.com>, <minipli@...glemail.com>,
	<dborkman@...hat.com>, <tgraf@...g.ch>, <joe@...ches.com>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH net-next v4 4/4 RFC] pktgen: Allow sending IPv4 TCP packets

On 05/08/14 21:09, David Miller wrote:
> From: Zoltan Kiss <zoltan.kiss@...rix.com>
> Date: Mon, 4 Aug 2014 14:37:14 +0100
>
>> @@ -3559,6 +3616,14 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
>>   		pkt_dev->last_pkt_size = pkt_dev->skb->len;
>>   		pkt_dev->allocated_skbs++;
>>   		pkt_dev->clone_count = 0;	/* reset counter */
>> +
>> +		if (netif_needs_gso(pkt_dev->skb, netif_skb_features(pkt_dev->skb))) {
>> +			pr_err("Device don't have necessary GSO features! netif_skb_features: %llX summed %u\n",
>> +			       netif_skb_features(pkt_dev->skb),
>> +			       pkt_dev->skb->ip_summed);
>> +			pkt_dev->sofar++;
>> +			goto out;
>> +		}
>>   	}
>>
>>   	if (pkt_dev->delay && pkt_dev->last_ok)
>
> Woe be to the person who actually triggers this condition.  This function
> happens potentially millions of times per second, there is no value in
> emitting a log message every time.
Indeed, I'll put a ratelimit around it.

Zoli

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