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From: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
To: "Morten Brørup" <mb@smartsharesystems.com>,
	"Stephen Hemminger" <stephen@networkplumber.org>
Cc: dpdk-dev <dev@dpdk.org>, Jerin Jacob <jerinj@marvell.com>
Subject: Re: [dpdk-dev] packet data access bug in bpf and pdump libs
Date: Wed, 9 Oct 2019 11:11:46 +0000	[thread overview]
Message-ID: <2601191342CEEE43887BDE71AB977258019197431F@irsmsx105.ger.corp.intel.com> (raw)
In-Reply-To: <98CBD80474FA8B44BF855DF32C47DC35C60B67@smartserver.smartshare.dk>

Hi Morten,

> 
> Hi Konstantin and Stephen,
> 
> I just noticed the same bug in your bpf and pcap libraries:
> 
> You are using rte_pktmbuf_mtod(), but should be using rte_pktmbuf_read(). Otherwise you cannot read data across multiple segments.

In plain data buffer mode expected input for BPF program is start of first segment packet data.
Other segments are simply not available to BPF program in that mode.
AFAIK, cBPF uses the same model.

> 
> 
> Med venlig hilsen / kind regards
> - Morten Brørup


  reply	other threads:[~2019-10-09 11:11 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-09 11:03 Morten Brørup
2019-10-09 11:11 ` Ananyev, Konstantin [this message]
2019-10-09 11:35   ` Morten Brørup
2019-10-09 15:02   ` Stephen Hemminger
2019-10-09 15:06     ` Morten Brørup
2019-10-09 15:14       ` Stephen Hemminger
2019-10-09 15:20         ` Morten Brørup
2019-10-09 17:24           ` Stephen Hemminger
2019-10-10  7:29             ` Morten Brørup
2019-10-10 15:36               ` Ananyev, Konstantin
2019-10-11  8:01                 ` Morten Brørup

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