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Wed, 11 Nov 2026 00:45:44 -0800 (PST) Received: from localhost ([93.66.104.131]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4ba0204342asm144103945e9.6.2026.11.11.00.45.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Nov 2026 00:45:41 -0800 (PST) Date: Wed, 11 Nov 2026 09:45:41 +0100 From: Lorenzo Bianconi To: netdev-bot+sashiko@kernel.org Cc: maxime.chevallier@bootlin.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@kernel.org, kuba@kernel.org, pabeni@redhat.com, mcoquelin.stm32@gmail.com, alexandre.torgue@foss.st.com, ast@kernel.org, daniel@iogearbox.net, hawk@kernel.org, john.fastabend@gmail.com, sdf@fomichev.me, Jose.Abreu@synopsys.com, boon.leong.ong@intel.com, netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org, bpf@vger.kernel.org, nb@tipi-net.de Subject: Re: [PATCH net-next v9] net: stmmac: rework stmmac_rx to support XDP rx multi-buff Message-ID: References: <20261106-stmmac-rx-mb-v9-1-c099c923664b@oss.qualcomm.com> <179431886808.994134.6784700644892681429@kernel.org> X-Mailing-List: bpf@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: multipart/signed; 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charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable > Thank you for your contribution! Sashiko AI review found 2 potential > issue(s) to consider. >=20 > Critical: 0 =B7 High: 0 (1) =B7 Medium: 1 =B7 Low: 1 >=20 > If you believe none of the issues are legitimate, please reply to each > issue of Medium severity or higher and explain why the AI is wrong. > If any of them are legitimate and you plan to respin, please let patchwork > know by including "pw-bot: cr" as a separate line at the end of your reply > (one such reply per series is enough). >=20 > - [Medium] The skb head truesize grows on every received frame, including > with no XDP program loaded, and the commit message does not say so. > - [Low] The commit message overstates one change. >=20 > Pre-existing issues: > - [High] This problem wasn't introduced by this patch, but the patch > makes it wider. >=20 > -- >=20 > net: stmmac: rework stmmac_rx to support XDP rx multi-buff >=20 > This reworks stmmac_rx() to collect all the descriptors of a frame into an > xdp_buff, so programs with frags support see the whole packet. On XDP_PASS > the skb is built from the xdp_buff head and its fragments. The patch also > saves the in-progress xdp_buff in rx_q->state across NAPI polls, advertis= es > NETDEV_XDP_ACT_RX_SG, and strips the FCS with a driver-local tail shrink. >=20 > > - carry the XDP metadata written with bpf_xdp_adjust_meta() into the skb > > via skb_metadata_set(), so it is no longer dropped and TC/BPF programs > > can read it through data_meta; >=20 > [Severity: Low] > Is this item accurate? The XDP_PASS path in stmmac_rx() already did this > before the patch. The patch removes these lines from stmmac_rx(): >=20 > - metasize =3D ctx.xdp.data - ctx.xdp.data_meta; > - if (metasize) > - skb_metadata_set(skb, metasize); >=20 > The same logic now lives in stmmac_build_skb(). >=20 > Metadata on linear frames was not being dropped before. The only frames > that never got metadata were multi-descriptor or buf2 frames, and XDP mode > dropped those outright. The commit message already covers that elsewhere. >=20 > Could this item be reworded so it does not read as a fix for a metadata > loss bug? I guess this is minor point, I can update the commit message if I need to repost. >=20 > > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/driver= s/net/ethernet/stmicro/stmmac/stmmac_main.c > > index a2177777727ef..c215cc70caa19 100644 > > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c >=20 > [ ... ] >=20 > > @@ -2290,10 +2294,6 @@ static int __alloc_dma_rx_desc_resources(struct = stmmac_priv *priv, > > SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); > > num_pages =3D DIV_ROUND_UP(dma_buf_sz_pad, PAGE_SIZE); > > =20 > > - rx_q->queue_index =3D queue; > > - rx_q->priv_data =3D priv; > > - rx_q->napi_skb_frag_size =3D num_pages * PAGE_SIZE; > > - > > pp_params.flags =3D PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV; > > pp_params.pool_size =3D dma_conf->dma_rx_size; > > pp_params.order =3D order_base_2(num_pages); > > @@ -2321,6 +2321,10 @@ static int __alloc_dma_rx_desc_resources(struct = stmmac_priv *priv, > > if (!addr) > > return -ENOMEM; > > =20 > > + rx_q->queue_index =3D queue; > > + rx_q->priv_data =3D priv; > > + rx_q->napi_skb_frag_size =3D PAGE_SIZE << pp_params.order; > > + >=20 > [Severity: Medium] > Does this change the skb head truesize for every received frame, even when > no XDP program is attached? >=20 > Before the patch the head size was num_pages * PAGE_SIZE. Now it is round= ed > up to the page_pool allocation order, and skb->truesize is derived from it > here: >=20 > stmmac_rx() > bufsz =3D rx_q->napi_skb_frag_size; > ... > xdp_init_buff(&ctx.xdp, bufsz, &rx_q->xdp_rxq); >=20 > stmmac_build_skb() > skb =3D napi_build_skb(xdp->data_hard_start, xdp->frame_sz); >=20 > On 4K pages, a dma_buf_sz of 8188 (BUF_SIZE_8KiB) gives num_pages =3D 3, = so > the head grows from 12K to 16K. A dma_buf_sz of 16368 (BUF_SIZE_16KiB) > gives num_pages =3D 5, so the head grows from 20K to 32K. >=20 > That shrinks the effective socket receive buffer for jumbo MTU users who > never load XDP. The commit message calls out the fragment truesize change > as a behavior change, but not this one. Should this be mentioned too? Same here, I guess this is minor point, I can update the commit message if I need to repost. >=20 > [ ... ] >=20 > > @@ -5962,120 +6073,79 @@ static int stmmac_rx(struct stmmac_priv *priv,= int limit, u32 queue) >=20 > [ ... ] >=20 > > + skb =3D stmmac_xdp_run_prog(priv, &ctx.xdp); > > + /* For Not XDP_PASS verdict */ > > + if (IS_ERR(skb)) { > > + unsigned int xdp_res =3D -PTR_ERR(skb); > > + > > + if (xdp_res & STMMAC_XDP_CONSUMED) { > > + stmmac_xdp_put_buff(rx_q, &ctx.xdp, true); > > + rx_dropped++; > > + } else if (xdp_res & (STMMAC_XDP_TX | > > + STMMAC_XDP_REDIRECT)) { > > + xdp_status |=3D xdp_res; > > + } > > + goto next; > > + } >=20 > [Severity: High] > This isn't a bug introduced by this patch, but multi-buffer frames can now > reach XDP_TX, which makes it worse. Does XDP_TX completion recycle pages > into this RX queue's page_pool direct cache from the wrong NAPI context? As pointed out by sashiko, this issue has not been introduced by this patch= and it should be fixed with a dedicated patch. Regards, Lorenzo >=20 > stmmac_xdp_xmit_back() picks the TX queue by CPU, not by RX queue: >=20 > stmmac_xdp_get_tx_queue() > while (index >=3D priv->plat->tx_queues_to_use) > index -=3D priv->plat->tx_queues_to_use; >=20 > Completion then runs in that channel's tx_napi: >=20 > stmmac_napi_poll_tx() > stmmac_tx_clean() > xdp_return_frame_rx_napi(xdpf) > __xdp_return(..., napi_direct=3Dtrue) /* head and every frag */ > page_pool_put_unrefed_netmem(..., allow_direct=3Dtrue) > page_pool_recycle_in_cache() >=20 > stmmac_tx_clean() { > ... > if (xdpf && > tx_q->tx_skbuff_dma[entry].buf_type =3D=3D STMMAC_TXBUF_T_XDP_TX) { > xdp_return_frame_rx_napi(xdpf); > ... > } >=20 > When allow_direct is already true, page_pool_put_unrefed_netmem() skips t= he > page_pool_napi_local() check. That means pool->alloc.cache and > pool->alloc.count are updated without a lock. >=20 > The tx_napi is a separate NAPI instance from the rx_napi that owns the > pool. Meanwhile the owning rx_napi can be on another CPU running > stmmac_rx_refill() or the allow_direct=3Dtrue puts in stmmac_xdp_put_buff= (), > stmmac_build_xdp_frags() and stmmac_xdp_shrink_tail(). >=20 > Can this corrupt the alloc cache? If so, the same page could be handed to > two RX descriptors, or recycled while an skb still holds it. >=20 > The race dates back to XDP_TX support. With this patch, though, each > XDP_TX frame can push the head plus several fragment pages down this path. > Would returning XDP_TX frames with xdp_return_frame() in stmmac_tx_clean() > avoid this? >=20 > --=20 > Sashiko AI review =B7 https://netdev-ai.bots.linux.dev/sashiko/#/patchset= /20261106-stmmac-rx-mb-v9-1-c099c923664b%40oss.qualcomm.com --gJMFUCSiM5fJQdUO Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTquNwa3Txd3rGGn7Y6cBh0uS2trAUCavQrNQAKCRA6cBh0uS2t rEHxAP4yTs3XsBIlnOt4lrybgaZSoFNAmTd4XbIZuJ3aij9V+AEAqpQa28+iqzeF oCunqOu8nRR8JPtar518G+PA9CcdfwQ= =IEXt -----END PGP SIGNATURE----- --gJMFUCSiM5fJQdUO--