linux-kernel - Re: [PATCH net 0/3] net: ethernet: ti: am65-cpsw: Fix XDP implementation

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Message-ID: <91d80afc-a911-4932-8f29-5697059efa8d@ti.com>
Date: Fri, 30 Aug 2024 15:40:30 +0530
From: MD Danish Anwar <danishanwar@...com>
To: Roger Quadros <rogerq@...nel.org>,
        "David S. Miller"
	<davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Alexei Starovoitov
	<ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard
 Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Julien
 Panis <jpanis@...libre.com>,
        Jacob Keller <jacob.e.keller@...el.com>
CC: Siddharth Vadapalli <s-vadapalli@...com>,
        Vignesh Raghavendra
	<vigneshr@...com>,
        Govindarajan Sriramakrishnan <srk@...com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <bpf@...r.kernel.org>
Subject: Re: [PATCH net 0/3] net: ethernet: ti: am65-cpsw: Fix XDP
 implementation



On 29/08/24 5:33 pm, Roger Quadros wrote:
> The XDP implementation on am65-cpsw driver is broken in many ways
> and this series fixes it.
> 
> Below are the current issues that are being fixed:
> 
> 1)  The following XDP_DROP test from [1] stalls the interface after
>     250 packets.
>     ~# xdb-bench drop -m native eth0
>     This is because new RX requests are never queued. Fix that.
> 
> 2)  The below XDP_TX test from [1] fails with a warning
>     [  499.947381] XDP_WARN: xdp_update_frame_from_buff(line:277): Driver BUG: missing reserved tailroom
>     ~# xdb-bench tx -m native eth0
>     Fix that by using PAGE_SIZE during xdp_init_buf().
> 
> 3)  In XDP_REDIRECT case only 1 packet was processed in rx_poll.
>     Fix it to process up to budget packets.
>     ~# ./xdp-bench redirect -m native eth0 eth0
> 
> 4)  If number of TX queues are set to 1 we get a NULL pointer
>     dereference during XDP_TX.
>     ~# ethtool -L eth0 tx 1
>     ~# ./xdp-trafficgen udp -A <ipv6-src> -a <ipv6-dst> eth0 -t 2
>     Transmitting on eth0 (ifindex 2)
>     [  241.135257] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000030
> 
> 5)  Net statistics is broken for XDP_TX and XDP_REDIRECT
> 
> [1] xdp-tools suite https://github.com/xdp-project/xdp-tools
> 
> Signed-off-by: Roger Quadros <rogerq@...nel.org>

This series looks good to me.

Reviewed-by: MD Danish Anwar <danishanwar@...com>

-- 
Thanks and Regards,
Danish