DPDK patches and discussions
 help / color / mirror / Atom feed
From: Bruce Richardson <bruce.richardson@intel.com>
To: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
Cc: "Zhang, Qi Z" <qi.z.zhang@intel.com>,
	"Wu, Jingjing" <jingjing.wu@intel.com>,
	"Xing, Beilei" <beilei.xing@intel.com>,
	"dev@dpdk.org" <dev@dpdk.org>,
	"stable@dpdk.org" <stable@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] net/i40e: fix unexpected mbuf free in vPMD
Date: Mon, 9 Oct 2017 14:20:58 +0100	[thread overview]
Message-ID: <20171009132057.GA31632@bricha3-MOBL3.ger.corp.intel.com> (raw)
In-Reply-To: <2601191342CEEE43887BDE71AB9772585FAA647D@IRSMSX103.ger.corp.intel.com>

On Mon, Oct 09, 2017 at 12:44:25PM +0000, Ananyev, Konstantin wrote:
> Hi Zhang,
> 
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Qi Zhang
> > Sent: Monday, October 9, 2017 9:54 AM
> > To: Wu, Jingjing <jingjing.wu@intel.com>; Xing, Beilei <beilei.xing@intel.com>
> > Cc: dev@dpdk.org; Zhang, Qi Z <qi.z.zhang@intel.com>; stable@dpdk.org
> > Subject: [dpdk-dev] [PATCH] net/i40e: fix unexpected mbuf free in vPMD
> > 
> > The patch reset tx queue sw_ring's mbuf to NULL after it is free in
> > i40_tx_free_bufs, this prevent same mbuf be free again in
> > i40e_dev_tx_queue_release. This fix follow the same implemenation of
> > non-vPMD.
> 
> Wonder why we can't change i40e_dev_tx_queue_release() instead, 
> so it will only go through the TXDs that were really armed?
> Let say from txq->tx_next_dd - tx_rs_thresh - 1 till txq->tx_tail?
> Let say _ixgbe_tx_queue_release_mbufs_vec() works that way.
> Then we probably can keep our runtime code intact.
> Konstantin
> 
+1 to this. We should avoid adding writes to the TX path. Instead we
should ensure that other routines properly track the buffers to be freed
using the appropriate indexes.

/Bruce

  reply	other threads:[~2017-10-09 13:21 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-09  8:53 Qi Zhang
2017-10-09  1:47 ` Wu, Jingjing
2017-10-09 12:44 ` Ananyev, Konstantin
2017-10-09 13:20   ` Bruce Richardson [this message]
2017-10-10  1:10   ` Zhang, Qi Z
2017-10-10 13:22 Qi Zhang
2017-10-10  8:48 ` Bruce Richardson
2017-10-10 11:05   ` Roger B. Melton
2017-10-10 11:39     ` Bruce Richardson
2017-10-10 11:47       ` Roger B. Melton

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20171009132057.GA31632@bricha3-MOBL3.ger.corp.intel.com \
    --to=bruce.richardson@intel.com \
    --cc=beilei.xing@intel.com \
    --cc=dev@dpdk.org \
    --cc=jingjing.wu@intel.com \
    --cc=konstantin.ananyev@intel.com \
    --cc=qi.z.zhang@intel.com \
    --cc=stable@dpdk.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).