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Fri, 09 Oct 2026 03:30:10 -0700 (PDT) Date: Fri, 9 Oct 2026 12:30:10 +0200 From: Lorenzo Bianconi To: Maxime Chevallier , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Maxime Coquelin , Alexandre Torgue , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Stanislav Fomichev , Jose Abreu , Ong Boon Leong Cc: netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, bpf@vger.kernel.org, James Hilliard Subject: Re: [PATCH net-next v4 0/2] net: stmmac: introduce XDP rx multi-buff support Message-ID: References: <20261006-stmmac-rx-mb-v4-0-efa4ca974e3d@oss.qualcomm.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="wgndA7NxLnWRH+t1" Content-Disposition: inline In-Reply-To: <20261006-stmmac-rx-mb-v4-0-efa4ca974e3d@oss.qualcomm.com> X-Proofpoint-GUID: Dc9OENQdHflNHT7sGekSIxGtLv-zEA69 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDA5MDA0MSBTYWx0ZWRfX8TcelQ9gpvUc uYQgJFRo4M9Ef2wxxpUVRhU3c5o+nyZ/2M24KUnXdlbtO2s6ZIzycdQCmXYFAQeuklEhQOVsY2s gFZNHeduq6oVhTnOnWTiKz0oAdgK/9s= X-Authority-Analysis: v=2.4 cv=Cs0q4X4D c=1 sm=1 tr=0 ts=6ac8c236 cx=c_pps a=mPf7EqFMSY9/WdsSgAYMbA==:117 a=WpTaRW6qxYHRGzLzQsVYzg==:17 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=w_4PuGcMj9oXbp2957IA:9 a=CjuIK1q_8ugA:10 a=iAawtVTI3XspOHW-ZK8A:9 a=dawVfQjAaf238kedN5IG:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDA5MDA0MSBTYWx0ZWRfX3JBDfzU+rh7e 2/Ri05+OWYWrnvAYp2P3o5JVYZctJcg+HdA0tvbkvgMhzwwVNFPQ0MmN0dOi3pPXAmeenITVBvg ph9cNHNEFBxIH56hMmnxJCJ2kPTdrwBOaGnNeUEtZ8nQHqxKskQFX1og8ofUZ+dXj32/PLuPFgX rIfdPXsrhm78j1Gr8755MRVkrbxxiHbXhTctBv+rYSCH7GBlwsq3FmqCd0iZybkp+MKqjiAvkDW ui/a1nAonkcNl+i3HdzNr8eOBzGntMuUpHygXnBuFsp74GuOzLc6eLMO48adTboWq7VS/gsUKCC 4/0jaMBp1sDr/jCGO0o7SmPDaNEeFU+pgByuwgOoFgRDItt3r+qjr7xb6dw4jEUQWLhd5UqzpAh vk6MH27mNuIYpx/0J49sPfeWcaEG6z5u0aY8s9rbZ/HkY4IHpWeQb9mn+xGVI4e6xt8lYGWhefz Ea3ZG1HGC1z/JDy/xQg== X-Proofpoint-ORIG-GUID: Dc9OENQdHflNHT7sGekSIxGtLv-zEA69 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-09_03,2026-10-08_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 bulkscore=0 clxscore=1015 adultscore=0 priorityscore=1501 lowpriorityscore=0 impostorscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610020000 definitions=main-2610090041 --wgndA7NxLnWRH+t1 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable > Rework stmmac_rx() to build the xdp_buff from all the descriptors that ma= ke > up a frame, so the XDP program runs on the whole (possibly fragmented) > packet instead of the first buffer only. Fix possible rx_q state leaks > when closing/opening the interface. >=20 > Note that an XDP program still cannot be attached with an MTU larger than > ETH_DATA_LEN and SPH is disabled while XDP is enabled, so an ordinary > frame fits in a single buffer. The multi-buffer path is exercised by > frames that do span several descriptors (for example jumbo frames the MAC > admits through its jumbo-enable bit) and is groundwork for extending XDP > to jumbo/SPH; it does not enable XDP jumbo support by itself. I will fix issues reported by sashiko in v5. Regards, Lorenzo >=20 > --- > Changes in v4: > - Reset in_progress flag when the packet is fully consumed. > - Advetise NETDEV_XDP_ACT_RX_SG capability. > - Link to v3: https://lore.kernel.org/r/20261004-stmmac-rx-mb-v3-0-50fa17= 1af9ec@oss.qualcomm.com >=20 > Changes in v3: > - Return secondary page in case of error. > - Introduce stmmac_xdp_shrink_tail() to remove the ethernet FCS. > - Add patch 'net: stmmac: take ownership of saved RX state at poll > entry' from James. > - Link to v2: https://lore.kernel.org/r/20260921-stmmac-rx-mb-v2-1-6e826e= 1ff306@oss.qualcomm.com >=20 > Changes in v2: > - Rely on xdp_buff_add_frag() to create xdp fragments > - Fix bugs in rx_q state recording > - Fix the corner case where we receive more than MAX_SKB_FRAGS fragments > - Cosmetics > - Link to v1: https://lore.kernel.org/r/20260918-stmmac-rx-mb-v1-1-0b4517= d404af@oss.qualcomm.com >=20 > --- > James Hilliard (1): > net: stmmac: take ownership of saved RX state at poll entry >=20 > Lorenzo Bianconi (1): > net: stmmac: rework stmmac_rx to support XDP rx multi-buff >=20 > drivers/net/ethernet/stmicro/stmmac/stmmac.h | 3 +- > drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 390 ++++++++++++++--= ------ > 2 files changed, 250 insertions(+), 143 deletions(-) > --- > base-commit: a5e7d8e446af9803e37a3b6a4d416fb41178348f > change-id: 20260918-stmmac-rx-mb-16469a2714ea >=20 > Best regards, > --=20 > Lorenzo Bianconi >=20 --wgndA7NxLnWRH+t1 Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTquNwa3Txd3rGGn7Y6cBh0uS2trAUCasjCMgAKCRA6cBh0uS2t rG50AQCJYxpyUnrWTKBC3SmBXC/JWh1W3xsif267HbbxwknqiAD9HAjk7mvQ9cxN BvH8j35NkTDGkCOs7eHeKweP/asd7As= =5yYK -----END PGP SIGNATURE----- --wgndA7NxLnWRH+t1--