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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Felix Fietkau , John Crispin , Sean Wang , Mark Lee , Lorenzo Bianconi , Matthias Brugger , AngeloGioacchino Del Regno , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, =?UTF-8?q?Ar=C4=B1n=C3=A7=20=C3=9CNAL?= Subject: [PATCH net] net: ethernet: mtk_eth_soc: fix DSA TX tag hwaccel for switch port 0 Date: Tue, 7 Feb 2023 12:30:27 +0200 Message-Id: <20230207103027.1203344-1-vladimir.oltean@nxp.com> X-Mailer: git-send-email 2.34.1 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: AS4P191CA0006.EURP191.PROD.OUTLOOK.COM (2603:10a6:20b:5d5::17) To VI1PR04MB5136.eurprd04.prod.outlook.com (2603:10a6:803:55::19) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: VI1PR04MB5136:EE_|AM9PR04MB8274:EE_ X-MS-Office365-Filtering-Correlation-Id: 09968a17-4ed3-4557-5078-08db08f65de8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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More precisely, they arrive without a DSA tag (in packet or in the hwaccel area - skb_metadata_dst()), so DSA cannot demux them towards the switch's interface for port 0. Traffic from other ports receives a skb_metadata_dst() with the correct port and is demuxed properly. Looking at mtk_poll_rx(), it becomes apparent that this driver uses the skb vlan hwaccel area: union { u32 vlan_all; struct { __be16 vlan_proto; __u16 vlan_tci; }; }; as a temporary storage for the VLAN hwaccel tag, or the DSA hwaccel tag. If this is a DSA master it's a DSA hwaccel tag, and finally clears up the skb VLAN hwaccel header. I'm guessing that the problem is the (mis)use of API. skb_vlan_tag_present() looks like this: #define skb_vlan_tag_present(__skb) (!!(__skb)->vlan_all) So if both vlan_proto and vlan_tci are zeroes, skb_vlan_tag_present() returns precisely false. I don't know for sure what is the format of the DSA hwaccel tag, but I surely know that lowermost 3 bits of vlan_proto are 0 when receiving from port 0: unsigned int port =3D vlan_proto & GENMASK(2, 0); If the RX descriptor has no other bits set to non-zero values in RX_DMA_VTAG, then the call to __vlan_hwaccel_put_tag() will not, in fact, make the subsequent skb_vlan_tag_present() return true, because it's implemented like this: static inline void __vlan_hwaccel_put_tag(struct sk_buff *skb, __be16 vlan_proto, u16 vlan_tci) { skb->vlan_proto =3D vlan_proto; skb->vlan_tci =3D vlan_tci; } What we need to do to fix this problem (assuming this is the problem) is to stop using skb->vlan_all as temporary storage for driver affairs, and just create some local variables that serve the same purpose, but hopefully better. Instead of calling skb_vlan_tag_present(), let's look at a boolean has_hwaccel_tag which we set to true when the RX DMA descriptors have something. Disambiguate based on netdev_uses_dsa() whether this is a VLAN or DSA hwaccel tag, and only call __vlan_hwaccel_put_tag() if we're certain it's a VLAN tag. Ar=C4=B1n=C3=A7 confirms that the treatment works, so this validates the assumption. Link: https://lore.kernel.org/netdev/704f3a72-fc9e-714a-db54-272e17612637@a= rinc9.com/ Fixes: 2d7605a72906 ("net: ethernet: mtk_eth_soc: enable hardware DSA untag= ging") Reported-by: Ar=C4=B1n=C3=A7 =C3=9CNAL Tested-by: Ar=C4=B1n=C3=A7 =C3=9CNAL Signed-off-by: Vladimir Oltean Reviewed-by: Felix Fietkau --- drivers/net/ethernet/mediatek/mtk_eth_soc.c | 24 ++++++++++++--------- 1 file changed, 14 insertions(+), 10 deletions(-) diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethe= rnet/mediatek/mtk_eth_soc.c index f1cb1efc94cf..64b575fbe317 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -1921,7 +1921,9 @@ static int mtk_poll_rx(struct napi_struct *napi, int = budget, =20 while (done < budget) { unsigned int pktlen, *rxdcsum; + bool has_hwaccel_tag =3D false; struct net_device *netdev; + u16 vlan_proto, vlan_tci; dma_addr_t dma_addr; u32 hash, reason; int mac =3D 0; @@ -2061,27 +2063,29 @@ static int mtk_poll_rx(struct napi_struct *napi, in= t budget, =20 if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX) { if (MTK_HAS_CAPS(eth->soc->caps, MTK_NETSYS_V2)) { - if (trxd.rxd3 & RX_DMA_VTAG_V2) - __vlan_hwaccel_put_tag(skb, - htons(RX_DMA_VPID(trxd.rxd4)), - RX_DMA_VID(trxd.rxd4)); + if (trxd.rxd3 & RX_DMA_VTAG_V2) { + vlan_proto =3D RX_DMA_VPID(trxd.rxd4); + vlan_tci =3D RX_DMA_VID(trxd.rxd4); + has_hwaccel_tag =3D true; + } } else if (trxd.rxd2 & RX_DMA_VTAG) { - __vlan_hwaccel_put_tag(skb, htons(RX_DMA_VPID(trxd.rxd3)), - RX_DMA_VID(trxd.rxd3)); + vlan_proto =3D RX_DMA_VPID(trxd.rxd3); + vlan_tci =3D RX_DMA_VID(trxd.rxd3); + has_hwaccel_tag =3D true; } } =20 /* When using VLAN untagging in combination with DSA, the * hardware treats the MTK special tag as a VLAN and untags it. */ - if (skb_vlan_tag_present(skb) && netdev_uses_dsa(netdev)) { - unsigned int port =3D ntohs(skb->vlan_proto) & GENMASK(2, 0); + if (has_hwaccel_tag && netdev_uses_dsa(netdev)) { + unsigned int port =3D vlan_proto & GENMASK(2, 0); =20 if (port < ARRAY_SIZE(eth->dsa_meta) && eth->dsa_meta[port]) skb_dst_set_noref(skb, ð->dsa_meta[port]->dst); - - __vlan_hwaccel_clear_tag(skb); + } else if (has_hwaccel_tag) { + __vlan_hwaccel_put_tag(skb, htons(vlan_proto), vlan_tci); } =20 skb_record_rx_queue(skb, 0); --=20 2.34.1