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Date: Thu, 18 Apr 2024 19:53:41 +0530
From: Siddharth Vadapalli <s-vadapalli@ti.com>
To: Julien Panis <jpanis@baylibre.com>
CC: Siddharth Vadapalli <s-vadapalli@ti.com>,
        "David S. Miller"
	<davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>, Jakub Kicinski
	<kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, Russell King
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        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann
	<daniel@iogearbox.net>,
        Jesper Dangaard Brouer <hawk@kernel.org>,
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 Fastabend <john.fastabend@gmail.com>,
        Sumit Semwal <sumit.semwal@linaro.org>,
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        Ratheesh Kannoth
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        Naveen Mamindlapalli <naveenm@marvell.com>,
        Jacob
 Keller <jacob.e.keller@intel.com>, <danishanwar@ti.com>,
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Subject: Re: [PATCH net-next v9 0/3] Add minimal XDP support to TI AM65 CPSW
 Ethernet driver
Message-ID: <b406c8bd-5d25-4516-8553-4041705b2211@ti.com>
References: <20240223-am65-cpsw-xdp-basic-v9-0-2c194217e325@baylibre.com>
 <260d258f-87a1-4aac-8883-aab4746b32d8@ti.com>
 <08319f88-36a9-445a-9920-ad1fba666b6a@baylibre.com>
 <1da48c7e-ba87-4f7a-b6d1-d35961005ab0@ti.com>
 <7f7fb71a-6d15-46f1-b63c-b569a2e230b7@baylibre.com>
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In-Reply-To: <7f7fb71a-6d15-46f1-b63c-b569a2e230b7@baylibre.com>

On Thu, Apr 18, 2024 at 04:03:15PM +0200, Julien Panis wrote:
> On 4/18/24 13:25, Siddharth Vadapalli wrote:
> > On Thu, Apr 18, 2024 at 01:17:47PM +0200, Julien Panis wrote:
> > > On 4/18/24 13:00, Siddharth Vadapalli wrote:
> > > > On 12-04-2024 21:08, Julien Panis wrote:
> > > > > This patch adds XDP support to TI AM65 CPSW Ethernet driver.
> > > > > 
> > > > > The following features are implemented: NETDEV_XDP_ACT_BASIC,
> > > > > NETDEV_XDP_ACT_REDIRECT, and NETDEV_XDP_ACT_NDO_XMIT.
> > > > > 
> > > > > Zero-copy and non-linear XDP buffer supports are NOT implemented.
> > > > > 
> > > > > Besides, the page pool memory model is used to get better performance.
> > > > > 
> > > > > Signed-off-by: Julien Panis <jpanis@baylibre.com>
> > > > Hello Julien,
> > > > 
> > > > This series crashes Linux on AM62ax SoC which also uses the
> > > > AM65-CPSW-NUSS driver:
> > > > https://gist.github.com/Siddharth-Vadapalli-at-TI/5ed0e436606001c247a7da664f75edee
> > > > 
> > > > Regards,
> > > > Siddharth.
> > > Hello Siddharth.
> > > 
> > > Thanks for the log. I can read:
> > > [    1.966094] Missing net_device from driver
> > > 
> > > Did you check that nodes exist in the device tree for the net devices ?
> > Yes it exists. The device-tree used was also built with linux-next
> > tagged next-20240417. The node corresponding to eth0 is cpsw_port1 which
> > is present and enabled in the device-tree:
> > https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts?h=next-20240417#n644
> > 
> > Regards,
> > Siddharth.
> 
> I could reproduce the bug by disabling 'cpsw_port2' in my device tree,
> which is 'k3-am625-sk.dts' for the board I use.
> 
> A condition is missing in am65_cpsw_create_xdp_rxqs() and
> am65_cpsw_destroy_xdp_rxqs() functions.
> 
> For these 2 functions, the code which is in the for loop should be
> run only when port ethX is enabled. That's why it crashes with
> your device tree (cpsw_port2 is disabled, which is not the case by
> default for the board I developed with).
> 
> I'll send a patch to fix the issue. Thanks for reporting it.

Thank you for root-causing and working on the fix for this issue.

Regards,
Siddharth.