linux-kernel - Re: [PATCH net-next v9 0/3] Add minimal XDP support to TI AM65 CPSW Ethernet driver

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Date: Thu, 18 Apr 2024 19:53:41 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: Julien Panis <jpanis@...libre.com>
CC: Siddharth Vadapalli <s-vadapalli@...com>,
        "David S. Miller"
	<davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Russell King
	<linux@...linux.org.uk>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann
	<daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John
 Fastabend <john.fastabend@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Simon Horman
	<horms@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Ratheesh Kannoth
	<rkannoth@...vell.com>,
        Naveen Mamindlapalli <naveenm@...vell.com>,
        Jacob
 Keller <jacob.e.keller@...el.com>, <danishanwar@...com>,
        <yuehaibing@...wei.com>, <rogerq@...nel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <bpf@...r.kernel.org>,
        <linux-media@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <linaro-mm-sig@...ts.linaro.org>
Subject: Re: [PATCH net-next v9 0/3] Add minimal XDP support to TI AM65 CPSW
 Ethernet driver

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@...libre.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.