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

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Message-Id: <20240829-am65-cpsw-xdp-v1-0-ff3c81054a5e@kernel.org>
Date: Thu, 29 Aug 2024 15:03:18 +0300
From: Roger Quadros <rogerq@...nel.org>
To: "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>, 
 Md Danish Anwar <danishanwar@...com>, Vignesh Raghavendra <vigneshr@...com>, 
 Govindarajan Sriramakrishnan <srk@...com>, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, bpf@...r.kernel.org, 
 Roger Quadros <rogerq@...nel.org>
Subject: [PATCH net 0/3] net: ethernet: ti: am65-cpsw: Fix XDP
 implementation

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>
---
Roger Quadros (3):
      net: ethernet: ti: am65-cpsw: fix XDP_DROP, XDP_TX and XDP_REDIRECT
      net: ethernet: ti: am65-cpsw: Fix NULL dereference on XDP_TX
      net: ethernet: ti: am65-cpsw: Fix RX statistics for XDP_TX and XDP_REDIRECT

 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 82 +++++++++++++++++++-------------
 1 file changed, 49 insertions(+), 33 deletions(-)
---
base-commit: 5be63fc19fcaa4c236b307420483578a56986a37
change-id: 20240829-am65-cpsw-xdp-d5876b25335c

Best regards,
-- 
Roger Quadros <rogerq@...nel.org>