netdev - Re: [PATCH bpf-next 10/14] mlx5, xsk: migrate to new MEM_TYPE_XSK_BUFF

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Date:   Fri, 8 May 2020 20:34:46 +0300
From:   Maxim Mikityanskiy <maximmi@...lanox.com>
To:     Björn Töpel <bjorn.topel@...il.com>
Cc:     Björn Töpel <bjorn.topel@...el.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Netdev <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        "Fijalkowski, Maciej" <maciej.fijalkowski@...el.com>
Subject: Re: [PATCH bpf-next 10/14] mlx5, xsk: migrate to new
 MEM_TYPE_XSK_BUFF_POOL

On 2020-05-08 16:14, Björn Töpel wrote:
> On Fri, 8 May 2020 at 15:08, Björn Töpel <bjorn.topel@...il.com> wrote:
>>
>> On Fri, 8 May 2020 at 15:01, Maxim Mikityanskiy <maximmi@...lanox.com> wrote:
>>>
> []
>>
>> All zeros hints that you're probably putting in the wrong DMA address somewhere.
>>
> 
> Hmm, I can't see that you're using xsk_buff_xdp_get_dma() anywhere in
> the code. Probably it?

You are right, thanks, it was indeed missing. However, adding it was not 
enough, I still get zeros, will continue investigating on Monday.

> 
> Björn
>