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[93.144.6.81]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a35a04ad39sm675152295e9.1.2026.10.27.04.10.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Oct 2026 04:10:57 -0700 (PDT) Date: Tue, 27 Oct 2026 12:10:57 +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, o.rempel@pengutronix.de, netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org, bpf@vger.kernel.org Subject: Re: [PATCH net 5/6] net: stmmac: fix VLAN tag stripping on short and non-linear RX frames Message-ID: References: <20261023-stmmac-xdp-fixes-v1-5-efb37e19f5bd@oss.qualcomm.com> <179309225715.3134.11251912403308890296@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; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="cZrf2fHhcABm3x1K" Content-Disposition: inline In-Reply-To: <179309225715.3134.11251912403308890296@kernel.org> X-Authority-Analysis: v=2.4 cv=RYwFmFtv c=1 sm=1 tr=0 ts=6ae086c4 cx=c_pps a=50t2pK5VMbmlHzFWWp8p/g==:117 a=7fYLNvKHbgS61GKHX+yayQ==:17 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=9R54UkLUAAAA:8 a=EUspDBNiAAAA:8 a=kOcqg-R2egU1R50GgGQA:9 a=QEXdDO2ut3YA:10 a=gJhHHGP7ekgXX11HjIMA:9 a=IoWCM6iH3mJn3m4BftBB:22 a=YTcpBFlVQWkNscrzJ_Dz:22 X-Proofpoint-GUID: qwRAAnOL2I1UQB9clpdjfcYw_hMdcF_6 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDI3MDA0NCBTYWx0ZWRfX24AAah0eCZoy rDD4cdQzhk8qXP81NJQHsp3JAco5qj2y7u8FqejnCwuBa8OEQLkPWduZPVhlA2nOQFohsql+nGB 1om3902vL2Uno33N21nQQ3kDTeEZd5M= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDI3MDA0NCBTYWx0ZWRfX0+Cjj51rjQ0Z O8EbyHccCDMkvz7+QxaFTECTpSDZ3koiAl64Jv3cN5/0yV5FORMkfvyfNgXhc25ICEkfVVeFiXF vboUE4KS+9qWc+XgVsgnxh0BEodc/98Okxv42sy60yfQN7L/TFKhWa229KDNQmkaa9iHjTHS/dj wj+qHk1f3DilQCZoXrfSqqUhKzPzQucbfAVcRBirjAlZ6m1CYqnvaFsthRU/UF2Ol5bHwwRClPA b7yr9B2qhFrMkld7U/Ms8eWw4thereIsSw7XJo3122Vaza462VKIHoGg1jDrvSR3W2FHwXpDYEc AN5INDF5+RVvbzrIZB4GFt9+szTusNkt2rEdAobNIMS/kXLEr7Ql3e/912xdnCbnP35RViCmxYR QrkXGod0t12vSRvRc5ubsKY98U6Gs/qmcE4+6y8LZPXOVwNn6KVcY6AwMlpH3WnsbQMCZlF2FjU QAL34uZhLvgW3gTaDBA== X-Proofpoint-ORIG-GUID: qwRAAnOL2I1UQB9clpdjfcYw_hMdcF_6 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-10-27_02,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 impostorscore=0 spamscore=0 phishscore=0 bulkscore=0 adultscore=0 priorityscore=1501 lowpriorityscore=0 malwarescore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610270044 --cZrf2fHhcABm3x1K Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable > Thank you for your contribution! Sashiko AI review found more severe > issue(s) in other patches of this series. This mail is only an FYI, in ca= se > you want to address the nit picks below when you respin. >=20 > Low priority / nit picks for your consideration: >=20 > - [Low] In stmmac_rx_vlan() > (drivers/net/ethernet/stmicro/stmmac/stmmac_main.c), the patch adds an= =E2=80=A6 >=20 > Pre-existing issues: > - [Medium] Only one of the two stmmac RX paths that call stmmac_rx_vlan() > records XDP metadata in the skb. > - [Medium] The new VLAN-error drop branch in stmmac_dispatch_skb_zc() > does a plain `priv->xstats.rx_dropped++` (line 5567). >=20 > -- >=20 > net: stmmac: fix VLAN tag stripping on short and non-linear RX frames >=20 > This patch changes stmmac_rx_vlan() so that it pulls ETH_HLEN before > reading h_vlan_proto, and pulls VLAN_ETH_HLEN before reading the TCI. It > returns an error so callers can drop frames that claim a VLAN tag but lack > the full header. It also moves XDP metadata together with the MAC > addresses when the tag is popped. >=20 > > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/driver= s/net/ethernet/stmicro/stmmac/stmmac_main.c > > index 8a2faf50d6957..32b2c5834c340 100644 > > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > > @@ -5102,22 +5102,35 @@ static netdev_features_t stmmac_features_check(= struct sk_buff *skb, > > return vlan_features_check(skb, features); > > } > > =20 > > -static void stmmac_rx_vlan(struct net_device *dev, struct sk_buff *skb) > > +static int stmmac_rx_vlan(struct net_device *dev, struct sk_buff *skb) > > { > > - struct vlan_ethhdr *veth =3D skb_vlan_eth_hdr(skb); > > - __be16 vlan_proto =3D veth->h_vlan_proto; > > - u16 vlanid; > > + struct vlan_ethhdr *veth; > > =20 > > - if ((vlan_proto =3D=3D htons(ETH_P_8021Q) && > > + if (!pskb_may_pull(skb, ETH_HLEN)) > > + return -EINVAL; >=20 > [Severity: Low] > This pull happens before the h_vlan_proto and dev->features checks. A fra= me > shorter than ETH_HLEN is now freed and counted in rx_dropped by both > stmmac_rx() and stmmac_dispatch_skb_zc(), even with CTAG/STAG RX stripping > disabled. The hw_vlan_en branch in those callers has no matching check. >=20 > Is that intended? The commit message says: >=20 > untagged frames, including short ones, are left untouched. >=20 > That holds only for frames between ETH_HLEN and VLAN_ETH_HLEN in length. >=20 > XDP doesn't seem able to reach this case, because bpf_xdp_adjust_head() > and bpf_xdp_adjust_tail() both refuse to go below ETH_HLEN. Dropping such > a runt is also arguably safer than handing it to eth_type_trans(). >=20 > Could the commit message mention that frames shorter than ETH_HLEN are now > dropped? ack, I will fix the commit message in v2. >=20 > > + > > + veth =3D skb_vlan_eth_hdr(skb); > > + if ((veth->h_vlan_proto =3D=3D htons(ETH_P_8021Q) && > > dev->features & NETIF_F_HW_VLAN_CTAG_RX) || > > - (vlan_proto =3D=3D htons(ETH_P_8021AD) && > > + (veth->h_vlan_proto =3D=3D htons(ETH_P_8021AD) && > > dev->features & NETIF_F_HW_VLAN_STAG_RX)) { > > + __be16 vlan_proto =3D veth->h_vlan_proto; > > + u8 meta_len =3D skb_metadata_len(skb); > > + u16 vlanid; > > + > > /* pop the vlan tag */ > > + if (!pskb_may_pull(skb, VLAN_ETH_HLEN)) > > + return -EINVAL; > > + > > + veth =3D skb_vlan_eth_hdr(skb); > > vlanid =3D ntohs(veth->h_vlan_TCI); > > - memmove(skb->data + VLAN_HLEN, veth, ETH_ALEN * 2); > > + memmove(skb->data - meta_len + VLAN_HLEN, > > + skb->data - meta_len, meta_len + ETH_ALEN * 2); >=20 > [Severity: Medium] > This isn't a bug introduced by this patch, but skb_metadata_len() can only > be non-zero for skbs built by stmmac_construct_skb_zc() on the AF_XDP > zero-copy path: This issue has not been introduced in this patch and it needs to be fixed w= ith a dedicated patch. >=20 > stmmac_construct_skb_zc() { > ... > memcpy(skb->data - metasize, xdp->data_meta, datasize + metasize); > if (metasize) > skb_metadata_set(skb, metasize); > ... > } >=20 > On the page_pool path, stmmac_rx() calls xdp_prepare_buff() with > meta_valid set to true, so bpf_xdp_adjust_meta() succeeds there. The > XDP_PASS skb is then built without recording the metadata length: >=20 > stmmac_rx() { > ... > /* XDP program may adjust header */ > head_pad_len =3D ctx.xdp.data - ctx.xdp.data_hard_start; > skb_reserve(skb, head_pad_len); > skb_put(skb, buf1_len); > skb_mark_for_recycle(skb); > ... > } >=20 > So skb_shinfo(skb)->meta_len stays 0 for these skbs. Doesn't that mean > metadata written by a non-ZC XDP program is lost before tc BPF can see it? > It would also mean this memmove only moves metadata for zero-copy skbs. >=20 > Should stmmac_rx() also call skb_metadata_set() with > ctx.xdp.data - ctx.xdp.data_meta? >=20 > This patch's own claim still holds on that path, since meta_len is 0 > there and data_meta cannot end up pointing at the wrong bytes. >=20 > > skb_pull(skb, VLAN_HLEN); > > __vlan_hwaccel_put_tag(skb, vlan_proto, vlanid); > > } > > + > > + return 0; > > } >=20 > [ ... ] >=20 > > @@ -5546,12 +5559,15 @@ static void stmmac_dispatch_skb_zc(struct stmma= c_priv *priv, u32 queue, > > } > > =20 > > stmmac_get_rx_hwtstamp(priv, p, np, skb); > > - if (priv->hw->hw_vlan_en) > > + if (priv->hw->hw_vlan_en) { > > /* MAC level stripping. */ > > stmmac_rx_hw_vlan(priv, priv->hw, p, skb); > > - else > > - /* Driver level stripping. */ > > - stmmac_rx_vlan(priv->dev, skb); > > + } else if (stmmac_rx_vlan(priv->dev, skb)) { > > + dev_kfree_skb_any(skb); > > + priv->xstats.rx_dropped++; >=20 > [Severity: Medium] > This is a pre-existing issue, but priv->xstats.rx_dropped is one > device-wide unsigned long in struct stmmac_extra_stats. Every channel's > NAPI poll updates it with a plain read-modify-write: This issue has not been introduced in this patch and it needs to be fixed w= ith a dedicated patch. Regards, Lorenzo >=20 > stmmac_dispatch_skb_zc() > priv->xstats.rx_dropped++; >=20 > stmmac_rx_zc() and stmmac_rx() > priv->xstats.rx_dropped +=3D rx_dropped; >=20 > stmmac_napi_add() registers a separate rx_napi/rxtx_napi for each channel, > so these polls can run at the same time on different CPUs. No lock, atomic > or u64_stats_sync protects the counter. >=20 > Can drop increments be lost this way? stmmac_get_stats64() also reads the > field without READ_ONCE(). >=20 > This patch only adds one more site that follows the existing pattern. >=20 > > + return; > > + } > > + > > skb->protocol =3D eth_type_trans(skb, priv->dev); >=20 > [ ... ] >=20 > --=20 > Sashiko AI review =C2=B7 https://netdev-ai.bots.linux.dev/sashiko/#/patch= set/20261023-stmmac-xdp-fixes-v1-0-efb37e19f5bd%40oss.qualcomm.com --cZrf2fHhcABm3x1K Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTquNwa3Txd3rGGn7Y6cBh0uS2trAUCauCGwQAKCRA6cBh0uS2t rNS8AP9vDBU1B16g84NKTu+DGkJz4a9j4jXoPXayJlU+Ccd4hwD/UxCB1EnTG7St rJuvmD5GPjc+BNjLxoEiuLLIwhYbjQg= =511R -----END PGP SIGNATURE----- --cZrf2fHhcABm3x1K--