netdev - Re: [PATCH] net_tx_action: Call trace_consume_skb() instead of trace_kfree

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Wed, 12 Sep 2012 15:39:49 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Shawn Bohrer <sbohrer@...advisors.com>
Cc:	netdev@...r.kernel.org, sanagi.koki@...fujitsu.com,
	davem@...emloft.net
Subject: Re: [PATCH] net_tx_action: Call trace_consume_skb() instead of
 trace_kfree_skb()

On Wed, 2012-09-12 at 08:20 -0500, Shawn Bohrer wrote:

> But I guess your question is who puts the skb on the completion_queue.
> In my case it looks like:
> 
> dev_kfree_skb_irq()
> dev_kfree_skb_any()
> mlx4_en_free_tx_desc()
> mlx4_en_process_tx_cq()
> mlx4_en_xmit()
> dev_hard_start_xmit()
> # from here up the stack there seems to be several paths one of which is
> dev_queue_xmit()
> ip_finish_output()

> Does this answer your question about how I'm hitting this tracepoint?

Yes : this driver can do TX completion from its start_xmit() as well...


We need to add new helpers for dev_kfree_skb_any() and
dev_kfree_skb_irq(), but its quite a lot of work.

An alternative would be to set a bit in skb (skb->consumed)



--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html