netdev - Re: [REPOST patch net-next V6] net: introduce ethernet teaming device

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Message-ID: <20111110064807.GB2058@minipsycho>
Date:	Thu, 10 Nov 2011 07:48:08 +0100
From:	Jiri Pirko <jpirko@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	bhutchings@...arflare.com, shemminger@...tta.com, fubar@...ibm.com,
	andy@...yhouse.net, tgraf@...radead.org, ebiederm@...ssion.com,
	mirqus@...il.com, kaber@...sh.net, greearb@...delatech.com,
	jesse@...ira.com, fbl@...hat.com, benjamin.poirier@...il.com,
	jzupka@...hat.com, ivecera@...hat.com
Subject: Re: [REPOST patch net-next V6] net: introduce ethernet teaming device

Thu, Nov 10, 2011 at 12:12:35AM CET, eric.dumazet@...il.com wrote:
>Le mercredi 09 novembre 2011 à 23:13 +0100, Jiri Pirko a écrit :
>> This patch introduces new network device called team. It supposes to be
>> very fast, simple, userspace-driven alternative to existing bonding
>> driver.
>
>...
>
>> +/*
>> + * note: already called with rcu_read_lock
>> + */
>> +static netdev_tx_t team_xmit(struct sk_buff *skb, struct net_device *dev)
>> +{
>> +	struct team *team = netdev_priv(dev);
>> +	bool tx_success = false;
>> +	unsigned int len = skb->len;
>> +
>> +	/*
>> +	 * Ensure transmit function is called only in case there is at least
>> +	 * one port present.
>> +	 */
>> +	if (likely(!list_empty(&team->port_list) && team->mode_ops.transmit))
>> +		tx_success = team->mode_ops.transmit(team, skb);
>> +	if (tx_success) {
>> +		struct team_pcpu_stats *pcpu_stats;
>> +
>> +		pcpu_stats = this_cpu_ptr(team->pcpu_stats);
>> +		u64_stats_update_begin(&pcpu_stats->syncp);
>> +		pcpu_stats->tx_packets++;
>> +		pcpu_stats->tx_bytes += len;
>> +		u64_stats_update_end(&pcpu_stats->syncp);
>> +	} else {
>> +		this_cpu_inc(team->pcpu_stats->tx_dropped);
>> +	}
>> +
>> +	return NETDEV_TX_OK;
>> +}
>> +
>
>If skb is not transmitted, its leaked.

dev_kfree_skb is called from module transmit functions to handle free of
skb when needed. But I see now that in case when
(likely(!list_empty(&team->port_list) && team->mode_ops.transmit)) == false
this would leak. I'm going to rewrite this bit somehow.
>
>
>
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