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Subject: Re: [Intel-wired-lan] [PATCH bpf v2 4/9] ice: change XDP RxQ frag_size from DMA write length to xdp.frame_sz 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 Fri, Feb 13, 2026 at 04:57:25AM +0100, Loktionov, Aleksandr wrote: > > > > -----Original Message----- > > From: Zaremba, Larysa > > Sent: Thursday, February 12, 2026 7:33 PM > > To: bpf@vger.kernel.org > > Cc: Zaremba, Larysa ; Claudiu Manoil > > ; Vladimir Oltean ; > > Wei Fang ; Clark Wang ; > > Andrew Lunn ; David S. Miller > > ; Eric Dumazet ; Jakub > > Kicinski ; Paolo Abeni ; Nguyen, > > Anthony L ; Kitszel, Przemyslaw > > ; Alexei Starovoitov ; > > Daniel Borkmann ; Jesper Dangaard Brouer > > ; John Fastabend ; > > Stanislav Fomichev ; Andrii Nakryiko > > ; Martin KaFai Lau ; Eduard > > Zingerman ; Song Liu ; Yonghong > > Song ; KP Singh ; Hao Luo > > ; Jiri Olsa ; Simon Horman > > ; Shuah Khan ; Lobakin, Aleksander > > ; Fijalkowski, Maciej > > ; Bastien Curutchet (eBPF Foundation) > > ; Vyavahare, Tushar > > ; Jason Xing ; > > Ricardo B. Marlière ; Eelco Chaudron > > ; Lorenzo Bianconi ; Toke > > Hoiland-Jorgensen ; imx@lists.linux.dev; > > netdev@vger.kernel.org; linux-kernel@vger.kernel.org; intel-wired- > > lan@lists.osuosl.org; linux-kselftest@vger.kernel.org; Loktionov, > > Aleksandr ; Dragos Tatulea > > > > Subject: [PATCH bpf v2 4/9] ice: change XDP RxQ frag_size from DMA > > write length to xdp.frame_sz > > > > The only user of frag_size field in XDP RxQ info is > > bpf_xdp_frags_increase_tail(). It clearly expects whole buff size > > instead of DMA write size. Different assumptions in ice driver > > configuration lead to negative tailroom. > > > > This allows to trigger kernel panic, when using > > XDP_ADJUST_TAIL_GROW_MULTI_BUFF xskxceiver test and changing packet > > size to > > 6912 and the requisted offset to a huge value, e.g. > > "requisted offset" -> "requested offset" > I am curious why codespell thinks this is fine. Will fix, bot has correctly identified that u32 rx_buf_len; is not longer needed after this patch. > Reviewed-by: Aleksandr Loktionov > > XSK_UMEM__MAX_FRAME_SIZE * 100. > > > > Due to other quirks of the ZC configuration in ice, panic is not > > observed in ZC mode, but tailroom growing still fails when it should > > not. > > > > Use fill queue buffer truesize instead of DMA write size in XDP RxQ > > info. > > Fix ZC mode too by using the new helper. > > > > Fixes: 2fba7dc5157b ("ice: Add support for XDP multi-buffer on Rx > > side") > > Reviewed-by: Aleksandr Loktionov > > Signed-off-by: Larysa Zaremba > > --- > > ... > > > -- > > 2.52.0 >