DPDK usage discussions
 help / color / mirror / Atom feed
From: Stephen Hemminger <stephen@networkplumber.org>
To: "JieSong" <songj@zctt.com>
Cc: "Ido Goshen" <Ido@cgstowernetworks.com>,
	"users@dpdk.org" <users@dpdk.org>
Subject: Re: [dpdk-users] Is it possible to receive packets with bad CRC?
Date: Tue, 8 Jun 2021 08:23:26 -0700
Message-ID: <20210608082326.66e83722@hermes.local> (raw)
In-Reply-To: <tencent_4691A2EE757D967406C3D0FD@qq.com>

On Tue, 8 Jun 2021 11:44:10 +0800
"JieSong" <songj@zctt.com> wrote:

> Hi Ido,
> &nbsp; &nbsp; I have the same question as yours, I want to get all the packets even the CRC/FCS error packet.
> &nbsp; &nbsp; Without DPDK I set the nic with "ethtool -K rx-all on", Then i can tcpdump all the packets both good and error packets.
> &nbsp; &nbsp; But I have no ideal with DPDK. Did you find something for this question?&nbsp;
> Thanks
> Jie
> &nbsp;
> &nbsp;
> &nbsp;
> ------------------&nbsp;Original&nbsp;------------------
> From: &nbsp;"Ido Goshen"<Ido@cgstowernetworks.com&gt;;
> Date: &nbsp;Mon, Dec 14, 2020 00:56 AM
> To: &nbsp;"users@dpdk.org"<users@dpdk.org&gt;; 
> Subject: &nbsp;[dpdk-users] Is it possible to receive packets with bad CRC?
> &nbsp;
> Hi
> By default bad CRC packets are dropped and raise the ierror counter.
> Is there a way to change this behavior for I350 (igb) and rx it by the app?
> I’ve tried setting DEV_RX_OFFLOAD_KEEP_CRC but this doesn’t help (I think this only keeps CRC for good packets)
> I’ve also tried enabling the Store Bad Packet (not sure what it does but it’s the closet I could find) by setting in e1000/igb_rxtx.c
> rctl |= E1000_RCTL_SBP;&nbsp; E1000_WRITE_REG(hw, E1000_RCTL, rctl);
> Didn’t help either.
> Is it possible to do with I350?
> Or with any of the other intel NICs? X522 (ixgbe) or X710 (i40e)?
> Thanx,
> &nbsp; *&nbsp;&nbsp; Ido

Please don't use HTML mail on the DPDK mailing list.

The DPDK ethdev API does not have a way to enable storing bad packets.
The DPDK ixgbe driver has a device specific API call rte_pmd_ixgbe_udp_fctrl_sbp which may
do what you want.  Device specific API's are discouraged but possible.

  reply	other threads:[~2021-06-08 15:23 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-13 16:55 Ido Goshen
2021-06-08  3:44 ` JieSong
2021-06-08 15:23   ` Stephen Hemminger [this message]
2021-06-09  4:58     ` songj

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:

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

  git send-email \
    --in-reply-to=20210608082326.66e83722@hermes.local \
    --to=stephen@networkplumber.org \
    --cc=Ido@cgstowernetworks.com \
    --cc=songj@zctt.com \
    --cc=users@dpdk.org \


* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

DPDK usage discussions

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://inbox.dpdk.org/users/0 users/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 users users/ https://inbox.dpdk.org/users \
	public-inbox-index users

Example config snippet for mirrors.
Newsgroup available over NNTP:

AGPL code for this site: git clone https://public-inbox.org/public-inbox.git