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Subject: Re: [Intel-wired-lan] [PATCH iwl-net] ixgbe: fix ndo_xdp_xmit() workloads X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On Tue, Aug 05, 2025 at 03:06:29PM +0200, Marcus Wichelmann wrote: > 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 > > Reported-by: Marcus Wichelmann > > 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 > > [...] > > 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. Somehow I assumed this went through the process and our maintainers took care of it - apologies for this inconvenience and let me address it. > > Thanks! > > Marcus