netdev - Re: [PATCH 5/5] net/cpsw: redo rx skb allocation in rx path

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Message-ID: <516FE36B.9050801@linutronix.de>
Date:	Thu, 18 Apr 2013 14:13:31 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Mugunthan V N <mugunthanvnm@...com>
CC:	netdev@...r.kernel.org, tglx@...utronix.de,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 5/5] net/cpsw: redo rx skb allocation in rx path

On 04/18/2013 01:50 PM, Mugunthan V N wrote:
>> diff --git a/drivers/net/ethernet/ti/cpsw.c
>> b/drivers/net/ethernet/ti/cpsw.c
>> index 559b020..f684e9b 100644
>> --- a/drivers/net/ethernet/ti/cpsw.c
>> +++ b/drivers/net/ethernet/ti/cpsw.c
>> @@ -469,43 +469,36 @@ void cpsw_tx_handler(void *token, int len, int
<snip>
>> -    if (unlikely(!netif_running(ndev))) {
>> -        if (skb)
>> -            dev_kfree_skb_any(skb);
>> -        return;
>> +    } else {
>> +        priv->stats.rx_dropped++;
>> +        new_skb = skb;
> Why you want to drop a successfully received packet as you memory alloc
> failed?
> Let the stack get it processed and there after you can continue with one
> less
> rx skb

Because, as I wrote, if this continues you end up without rx skbs.
However, if you if you are under memory pressure it is possible that
other callers in the stack have the same problem.

> 
> Regards
> Mugunthan V N

Sebastian
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