netdev - Re: [PATCH iwl-net] ixgbe: fix ndo_xdp

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Message-ID: <bb545742-8878-4780-932e-4261ae226aac@hetzner-cloud.de>
Date: Tue, 5 Aug 2025 15:06:29 +0200
From: Marcus Wichelmann <marcus.wichelmann@...zner-cloud.de>
To: Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
 intel-wired-lan@...ts.osuosl.org
Cc: netdev@...r.kernel.org, anthony.l.nguyen@...el.com,
 magnus.karlsson@...el.com, michal.kubiak@...el.com, sdn@...zner-cloud.de
Subject: Re: [PATCH iwl-net] ixgbe: fix ndo_xdp_xmit() workloads

Am 29.04.25 um 17:52 schrieb Maciej Fijalkowski:
> Currently ixgbe driver checks periodically in its watchdog subtask if
> there is anything to be transmitted (consdidering both Tx and XDP rings)
> under state of carrier not being 'ok'. Such event is interpreted as Tx
> hang and therefore results in interface reset.
> 
> This is currently problematic for ndo_xdp_xmit() as it is allowed to
> produce descriptors when interface is going through reset or its carrier
> is turned off.
> 
> Furthermore, XDP rings should not really be objects of Tx hang
> detection. This mechanism is rather a matter of ndo_tx_timeout() being
> called from dev_watchdog against Tx rings exposed to networking stack.
> 
> Taking into account issues described above, let us have a two fold fix -
> do not respect XDP rings in local ixgbe watchdog and do not produce Tx
> descriptors in ndo_xdp_xmit callback when there is some problem with
> carrier currently. For now, keep the Tx hang checks in clean Tx irq
> routine, but adjust it to not execute it for XDP rings.
> 
> Cc: Tobias Böhm <tobias.boehm@...zner-cloud.de>
> Reported-by: Marcus Wichelmann <marcus.wichelmann@...zner-cloud.de>
> Closes: https://lore.kernel.org/netdev/eca1880f-253a-4955-afe6-732d7c6926ee@hetzner-cloud.de/
> Fixes: 6453073987ba ("ixgbe: add initial support for xdp redirect")
> Fixes: 33fdc82f0883 ("ixgbe: add support for XDP_TX action")
> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> [...]

Hi,

could you please consider submitting this patch (or a newer version)
for being merged into mainline?

This would help us not having to build our own kernels with this patch
for forever.

Thanks!

Marcus