linux-kernel - Re: [Intel-wired-lan] [PATCH net v4 1/1] i40e: xsk: advance next_to

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Message-ID: <aR0UKHeilBX5oTg9@lima-default>
Date: Wed, 19 Nov 2025 11:49:44 +1100
From: Alessandro Decina <alessandro.d@...il.com>
To: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Cc: "Loktionov, Aleksandr" <aleksandr.loktionov@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Alexei Starovoitov <ast@...nel.org>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Daniel Borkmann <daniel@...earbox.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Paolo Abeni <pabeni@...hat.com>,
	"Kitszel, Przemyslaw" <przemyslaw.kitszel@...el.com>,
	Stanislav Fomichev <sdf@...ichev.me>,
	"Sarkar, Tirthendu" <tirthendu.sarkar@...el.com>,
	"Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
	"bpf@...r.kernel.org" <bpf@...r.kernel.org>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Intel-wired-lan] [PATCH net v4 1/1] i40e: xsk: advance
 next_to_clean on status descriptors

On Tue, Nov 18, 2025 at 07:45:24PM +0100, Maciej Fijalkowski wrote:
> Repro steps would be nice to have, rest would be rather redundant to me.

Yeah unfortunately I don't really know how to _manually_ reproduce.

I don't know why I'm getting these status descriptors, but I'm getting
them reproducibly every few minutes on ubuntu 24.04 across 3 machines
where I've hit this bug/tested the fix. The machines are doing ~300Mbps
of UDP traffic, some of which is done using AF_XDP. The AF_XDP code is
TX only, so it's executing the build-skb-in-zc-path all the time as all
the ingress traffic goes to sockets. 

If you have any idea on how to reliably produce the descriptors I'm
happy to give it a try.