netdev - Re: [PATCH] Revert "dpaa_eth: add XDP

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Date:   Thu, 18 Feb 2021 12:42:40 +0100
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Sascha Hauer <s.hauer@...gutronix.de>
Cc:     brouer@...hat.com, netdev@...r.kernel.org,
        Camelia Groza <camelia.groza@....com>,
        Madalin Bucur <madalin.bucur@....com>,
        Jakub Kicinski <kuba@...nel.org>, kernel@...gutronix.de,
        Ioana Ciornei <ioana.ciornei@....com>,
        Ioana Ciocoi Radulescu <ruxandra.radulescu@....com>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>
Subject: Re: [PATCH] Revert "dpaa_eth: add XDP_REDIRECT support"

On Wed, 17 Feb 2021 16:17:58 +0100
Sascha Hauer <s.hauer@...gutronix.de> wrote:

> This reverts commit a1e031ffb422bb89df9ad9c018420d0deff7f2e3.
> 
> This commit introduces a:
> 
> 	np = container_of(&portal, struct dpaa_napi_portal, p);
> 
> Using container_of() on the address of a pointer doesn't make sense as
> the pointer is not embedded into the desired struct.
> 
> KASAN complains about it like this:
> 
> [   17.703277] ==================================================================
> [   17.710517] BUG: KASAN: stack-out-of-bounds in rx_default_dqrr+0x994/0x14a0
> [   17.717504] Read of size 4 at addr ffff0009336495fc by task systemd/1
> [   17.723955]
> [   17.725447] CPU: 0 PID: 1 Comm: systemd Not tainted 5.11.0-rc6-20210204-2-00033-gfd6caa9c7514-dirty #63
> [   17.734857] Hardware name: TQ TQMLS1046A SoM
> [   17.742176] Call trace:
> [   17.744621]  dump_backtrace+0x0/0x2e8
> [   17.748298]  show_stack+0x1c/0x68
> [   17.751622]  dump_stack+0xe8/0x14c
> [   17.755033]  print_address_description.constprop.0+0x68/0x304
> [   17.760794]  kasan_report+0x1d4/0x238
> [   17.764466]  __asan_load4+0x88/0xc0
> [   17.767962]  rx_default_dqrr+0x994/0x14a0
> [   17.771980]  qman_p_poll_dqrr+0x254/0x278
> [   17.776000]  dpaa_eth_poll+0x4c/0xe0
> ...
> 
> It's not clear to me how a the struct dpaa_napi_portal * should be
> derived from the struct qman_portal *, so revert the patch for now.

Can we please get a response from NXP people?

Are you saying XDP_REDIRECT feature is completely broken on dpaa driver?

(I only have access to dpaa2 hardware)

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer