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From: "Zhang, Yuying" <yuying.zhang@intel.com>
To: David Marchand <david.marchand@redhat.com>
Cc: dev <dev@dpdk.org>, Maxime Coquelin <maxime.coquelin@redhat.com>,
	"Xia, Chenbo" <chenbo.xia@intel.com>,
	dpdk stable <stable@dpdk.org>
Subject: RE: [PATCH v1] net/vhost: clear data of packet mbuf after sending pkts
Date: Tue, 1 Mar 2022 09:02:49 +0000	[thread overview]
Message-ID: <DM6PR11MB3516AF1D34F327FEFAC4BABD8E029@DM6PR11MB3516.namprd11.prod.outlook.com> (raw)
In-Reply-To: <CAJFAV8wtShAeacbN-pjSTKw289qObJy8YxbV2fq_X8wpRoQ2qw@mail.gmail.com>

Hi Marchand,

> -----Original Message-----
> From: David Marchand <david.marchand@redhat.com>
> Sent: Tuesday, March 1, 2022 4:44 PM
> To: Zhang, Yuying <yuying.zhang@intel.com>
> Cc: dev <dev@dpdk.org>; Maxime Coquelin <maxime.coquelin@redhat.com>;
> Xia, Chenbo <chenbo.xia@intel.com>; dpdk stable <stable@dpdk.org>
> Subject: Re: [PATCH v1] net/vhost: clear data of packet mbuf after sending pkts
> 
> On Tue, Mar 1, 2022 at 8:29 AM Yuying Zhang <yuying.zhang@intel.com> wrote:
> >
> > The PMD frees a packet mbuf back into its original mempool after
> > sending a packet. However, old data is not cleaned up which causes
> > error in payload of new packets. This patch clear data of packet mbuf
> > before freeing mbuf.
> 
> This patch looks wrong to me.
> What is the actual issue you want to fix?

eth_vhost_tx() frees the packet mbuf back into its original mempool every time after a packet sent without clearing the data field.
Then packet transmit  function will get bulk directly without reset. New generated packet contains old data of previous packet. This is wrong.

> 
> 
> --
> David Marchand


  reply	other threads:[~2022-03-01  9:02 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-01  7:28 Yuying Zhang
2022-03-01  8:38 ` Ling, WeiX
2022-03-01  8:43 ` David Marchand
2022-03-01  9:02   ` Zhang, Yuying [this message]
2022-03-01  9:47     ` David Marchand
2022-03-01 17:05       ` Stephen Hemminger
2022-03-02  8:58       ` Zhang, Yuying
2022-03-03  6:49         ` Xia, Chenbo

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