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Subject: Re: [Intel-wired-lan] [PATCH net v4 1/1] i40e: xsk: advance next_to_clean on status descriptors 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 Wed, Nov 19, 2025 at 11:49:44AM +1100, Alessandro Decina wrote: > 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 Might be a HW quirk, I don't remember. Other example I have handy is HW that is served by ice driver can sometimes produce 0-length descriptors for jumbo frames and we do handle this in driver. Describing your setup in commit message would be enough, if you ask me. > 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.