From: Daniel Kaminsky <daniel.kaminsky@infinitelocality.com>
To: "Zhang, Helin" <helin.zhang@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] Loop back mode of the KNI
Date: Wed, 25 Dec 2013 08:57:11 +0200 [thread overview]
Message-ID: <CA+8v-JyZSmgWRnNhAtjuFy6-+4ajPpS0EcD0VfP+=vsUBdLJmg@mail.gmail.com> (raw)
In-Reply-To: <F35DEAC7BCE34641BA9FAC6BCA4A12E70A6877FB@SHSMSX104.ccr.corp.intel.com>
Thanks Helin,
The "fix" below works for me but I don't think it's complete and correct
for all kernels.
Daniel
Index: src/kernel/fast_kni/kni_net.c
===================================================================
--- src/kernel/fast_kni/kni_net.c
+++ src/kernel/fast_kni/kni_net.c
@@ -353,6 +353,12 @@
kni->stats.rx_bytes += len;
kni->stats.rx_packets++;
+ /* adjust the skb */
+ if (likely(skb_mac_header_was_set(skb))) {
+ skb->len += ETH_HLEN;
+ skb->data -= ETH_HLEN;
+ }
+
/* call tx interface */
kni_net_tx(skb, dev);
}
On Wed, Dec 25, 2013 at 2:50 AM, Zhang, Helin <helin.zhang@intel.com> wrote:
> Hi Daniel
>
> Thanks for your good catch!
> Yes. That's a bug, and it will be fixed in later DPDK releases.
>
> Regards,
> Helin
>
> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Daniel Kaminsky
> Sent: Friday, December 20, 2013 12:36 AM
> To: dev@dpdk.org
> Subject: [dpdk-dev] Loop back mode of the KNI
>
> Hi all,
>
> We're working on the KNI and we see a strange behavior which seems like a
> bug in the the kernel module.
>
> When running with *lo_mode=lo_mode_fifo *everything works as expected, the
> packets looks similar on the ingress and egress.
> But when running with *lo_mode=lo_mode_fifo_skb *the packets on the egress
> doesn't include the first 14 bytes (the ethernet header) although the
> packets size doesn't change.
>
> Thanks,
> Daniel
>
next prev parent reply other threads:[~2013-12-25 6:56 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-19 16:36 Daniel Kaminsky
2013-12-25 0:50 ` Zhang, Helin
2013-12-25 6:57 ` Daniel Kaminsky [this message]
2014-01-17 11:19 ` Thomas Monjalon
2014-01-17 14:28 ` Zhang, Helin
2014-01-17 15:35 ` Thomas Monjalon
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