From mboxrd@z Thu Jan  1 00:00:00 1970
From: Clarylin L <clearasu@gmail.com>
Subject: Re: multi-segment mbuf
Date: Tue, 22 Mar 2016 13:36:28 -0700
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 <20160322102740.GC19268@bricha3-MOBL3>
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To: Bruce Richardson <bruce.richardson@intel.com>
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Sorry my bad. The mbuf size has been accidentally changed to 3000.

After fixing this by setting mbuf size to 2048, multi-segment mbuf still
doesn't work. I was trying to send 2500-byte packets to the target system
and was expecting to see two-segment mbuf chain), but got errors on it.

Tue Mar 22 14:52:00 2016^@PMD: rte_enic_pmd: packet error


Tue Mar 22 14:52:01 2016^@PMD: rte_enic_pmd: packet error


Tue Mar 22 14:52:02 2016^@PMD: rte_enic_pmd: packet error


Tue Mar 22 14:52:03 2016^@PMD: rte_enic_pmd: packet error


Tue Mar 22 14:52:04 2016^@PMD: rte_enic_pmd: packet error


Is enic supporting multi-segment mbuf? The dpdk version is 2.0.0. I have
enabled jumbo-frame and enable_scatter for the port.

On Tue, Mar 22, 2016 at 3:27 AM, Bruce Richardson <
bruce.richardson@intel.com> wrote:

> On Mon, Mar 21, 2016 at 04:34:50PM -0700, Clarylin L wrote:
> > I am trying multi-segment mbuf, but it seems not working.
> >
> > On my target host, the mbuf size is set to 2048 and I am trying to send
> > large packet to it (say 2500 bytes without fragmentation) from another
> > host. I enabled both jumbo_frame and enable_scatter for the port. But I
> saw
> > on the target only one mbuf is received with data_len equal to 2500 (it's
> > supposed to be a two-mbuf chain).  Although mbuf itself is not working as
> > expected, ping between two hosts succeeded (large ping size; no
> > fragmentation).
> >
> > 1. my mbuf size is only 2048. how can it support receiving such large
> > packet in one mbuf?
> >
> > 2.how to make it work as expected (enable multi-segment mbuf and receive
> > using mbuf chain when needed)?
> >
> > Appreciate your help.
>
> Hi,
>
> when you get the single mbuf with data_len == 2500, what is the buf_len
> value
> reported as?
>
> /Bruce
>