From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH v3 1/5] net/af_xdp: introduce AF XDP PMD
 driver
Date: Fri, 22 Mar 2019 08:37:46 -0700
Message-ID: <20190322083746.12467e17@shemminger-XPS-13-9360>
References: <20190301080947.91086-1-xiaolong.ye@intel.com>
 <20190321091845.78495-1-xiaolong.ye@intel.com>
 <20190321091845.78495-2-xiaolong.ye@intel.com>
 <20190321083000.5894dbf7@shemminger-XPS-13-9360>
 <20190322020157.GD84243@intel.com>
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Cc: dev@dpdk.org, Qi Zhang <qi.z.zhang@intel.com>, Karlsson Magnus
 <magnus.karlsson@intel.com>, Topel Bjorn <bjorn.topel@intel.com>
To: Ye Xiaolong <xiaolong.ye@intel.com>
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On Fri, 22 Mar 2019 10:01:57 +0800
Ye Xiaolong <xiaolong.ye@intel.com> wrote:

> On 03/21, Stephen Hemminger wrote:
> >On Thu, 21 Mar 2019 17:18:41 +0800
> >Xiaolong Ye <xiaolong.ye@intel.com> wrote:
> >  
> >> +
> >> +	if (ret < 0)
> >> +		return -EINVAL;
> >> +
> >> +	return 0;  
> >
> >You could propogate kernel errno into DPDK?
> >	return (ret < 0) ? -errno : 0;
> >  
> 
> Sorry, could you share the advantage of doing this?
> 
> Thanks,
> Xiaolong

Suppose kernel returned -ENOTSUPP or other error, it could go back to
the caller rather than juse invalid.