From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f49.google.com (mail-wr1-f49.google.com [209.85.221.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2F8F62E8DEF for ; Fri, 7 Aug 2026 14:07:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.49 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786111679; cv=none; b=nX+RsYJM2MfqO1xuo8kvv0ouZWSzEpr8pd2DfcQ3zSgzOHsdKiaZ24rMsqwMCsVrUmuOjOkvd0GIJ9ElNBiXuDZ1DJkxfuIHiYSBx3mKa9FlLftGhoM6Xn4eAAy7pxs4qpz5N/RW+wW0lZfU+w6krrc1bwBzd0+VoFVm1by32ZE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786111679; c=relaxed/simple; bh=3bCtOifuFc7J3Rr7UUrsOND5iV/KohhwCXR0G0U50ug=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FRBhBsg1mWOnIlKWbQFVQ2c1GOqHvmEBwf6XPEOF4T/STLzMugmiXuKSKXglpkM5v9U1YPQPF+7C6XFS087c7FkG91lhnKMaRRu+FHjUIecpVBjtVyx/SmidZPdaar/6z55J+Xkx4zsVd3g1OzlHtbYDzwX6LgOPyGtIGoJlPiY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=HUav/tCV; arc=none smtp.client-ip=209.85.221.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="HUav/tCV" Received: by mail-wr1-f49.google.com with SMTP id ffacd0b85a97d-4731f5ffa74so284153f8f.1 for ; Fri, 07 Aug 2026 07:07:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1786111675; x=1786716475; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=VdpvcqvwrdqUs5sE0SeDLQ9ugUxBd1IjKy13SBkkSv8=; b=HUav/tCV7ilSX34LG5upW1qkX86YqLA3UUCSLMkpafEFwO0pkqcccScP6jl993A806 teYcaYzOhSC5wuQdMpXmvLpNBCGOIEiZnZzn9yQOog4Wqf46c8X+sTjsG6DigAPOoSMS oLfVBFafg1uia5m8t7sod8l7yVsJuJtIMgxtasYidQpUyZ4inQdnfXXJmy08XQC4Cl5W lUud1bh4vy1cOY4GTBFcp9LPH2vO155CkYTa+wfDO0alFrGNWtaVwARnpd09zNbpwDcS H8zbaQBUSy5YlWnKNBR2dNAGURqO2eR5BN6sjGNKwhpj1h3U6bgNxLs3R+IcU6corNAM GTxw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786111675; x=1786716475; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=VdpvcqvwrdqUs5sE0SeDLQ9ugUxBd1IjKy13SBkkSv8=; b=eEuEFvbyCifCkDGY/XEDXz1aPjMBjsKVZA02OoWhxo2tIdNHWIHjIWztsnb3PLbjZO 0Cvx5NSd0p2Nm0jvmHGeLrTZ33QWiZLZ9b/S6bZmMIxV8hWjtcwexFPotjaB8FbrjEkk VZUXpfin4/jm/5cuYLXVE4+TZ5ThC1K45ybUDeViPSAX8MLQSnGb6K8fwfuvWkJCZ6Jn D76IMm1lxLxxUhQlYSSYPy0cCgSZicd+m9UNK3x8hO3b/gcmCp93odWNeO7mMpNojP+N Lq6VTt2Q1dN1Kx5mDLRVq2xr0KTwz8MrNdcFxsxOip5ia2UJz54buxQY6CnIH7yNfJ3s pnvg== X-Gm-Message-State: AOJu0Yy0VoMsez7WY4PvwarRZB/ragugJJ+iwmwdbNYznGDovsgwp2Hh 9s23RYQTbi1Ak/q2CazwD53GPGX5IJGSCreVZT4c+dC7jeEbr9WwGSQ81NEv2LoHfaw= X-Gm-Gg: AR+sD12FZT1p6k2asPNjwCDYxdU2dyzmVVumggMUBGFByzW3VW2P+d7VYrQUGagRA7L hD2gOnNsjrsJMywCKJsTGc1YWSJIKBEcU+pDERD2Xe1gkYolYGOE4oSBSNRu1aodjZ/BXKfqhcb 0LbJPmLh0BjRi2QxyVNz1w4ojFltAvCrUTDfpbrHk4TFlqeQxVMshnKJQqoHOLzA3AEPJb0h2Su Ysk8xx2jnSN+B6bkUXU4NwRiHUYqRFR0lCjOIccxSe7347YuYWWLTDwU7yrGWi3qreQOI3BwX9Z Jpevj20eSoeRAQaH77iutFqbFBpYQjG3inqbHBHlwSCORYPJ5CQH4bFF2gzpzvDGOtBuQ1AJISC gJP21zR4KG795R9DJjktY3gF6tEAvHWVW3jRcfTR22k6KaB7ESV1wjiG9xZiZiWNdwQlPQNfMcR lgKpBKExyZo2EOE83NJiyvQN5ikx80ACtWFdYjLX/LpX7NrOw7Jq6Id8gRWP/cyCyhCDePOhlIF RBhc1PRJHG2z6lmkJlXyExr9xh5iorSbKslgUa4jFg3fdv/fVkYSqWF4v/hkLWLIEWkNTw2H48S EU1y/W6G0fxEo9cw/dTYSy7L3SqgOpQXzg== X-Received: by 2002:a5d:5f83:0:b0:47f:80e0:53bf with SMTP id ffacd0b85a97d-47fec5322c9mr17563757f8f.3.1786111675024; Fri, 07 Aug 2026 07:07:55 -0700 (PDT) Received: from L-022584.energy.envision.com (dynamic-077-179-201-133.77.179.pool.telefonica.de. [77.179.201.133]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-480021506c0sm5980064f8f.11.2026.08.07.07.07.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 Aug 2026 07:07:54 -0700 (PDT) From: Xin Xie To: netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, andrew+netdev@lunn.ch, shuah@kernel.org, kees@kernel.org, petr.wozniak@gmail.com, qingfang.deng@linux.dev, fmaurer@redhat.com, luka.gejak@linux.dev, bigeasy@linutronix.de, xiaoliang.yang_1@nxp.com, skhawaja@google.com, stable@vger.kernel.org, sdf.kernel@gmail.com, Xin Xie Subject: [PATCH net v5 1/4] net: hsr: fix packet drops caused by GRO superpackets Date: Fri, 7 Aug 2026 16:07:47 +0200 Message-ID: <20260807140751.1351-2-xiexinet@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260807140751.1351-1-xiexinet@gmail.com> References: <20260807140751.1351-1-xiexinet@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit HSR/PRP process each wire frame separately for tagging and duplicate discard. GRO on a lower device hides multiple frames in one skb, which cannot be forwarded with valid per-frame metadata. Disable GRO and GRO_HW when a lower device is enslaved, matching the existing LRO handling. This is best effort because GRO may be re-enabled and some devices cannot disable GRO_HW. The forward-entry segmentation fix handles plain, trailer-free GSO skbs that still arrive; device-specific fixed-on GRO_HW output is outside this guarantee. Fixes: f421436a591d ("net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)") Cc: stable@vger.kernel.org Signed-off-by: Xin Xie --- include/linux/netdevice.h | 2 ++ net/core/dev.c | 15 +++++++++++++++ net/core/dev_api.c | 21 +++++++++++++++++++++ net/hsr/hsr_slave.c | 5 +++++ 4 files changed, 43 insertions(+) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 9981d637f8b5..eba2c26a49ba 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -3434,6 +3434,8 @@ void dev_close(struct net_device *dev); void netif_close_many(struct list_head *head, bool unlink); void netif_disable_lro(struct net_device *dev); void dev_disable_lro(struct net_device *dev); +void netif_disable_gro(struct net_device *dev); +void dev_disable_gro(struct net_device *dev); int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *newskb); u16 dev_pick_tx_zero(struct net_device *dev, struct sk_buff *skb, struct net_device *sb_dev); diff --git a/net/core/dev.c b/net/core/dev.c index 5933c5dab09e..f20d5ab0cf72 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1840,6 +1840,21 @@ void netif_disable_lro(struct net_device *dev) } } +void netif_disable_gro(struct net_device *dev) +{ + struct net_device *lower_dev; + struct list_head *iter; + + dev->wanted_features &= ~(NETIF_F_GRO | NETIF_F_GRO_HW); + netdev_update_features(dev); + + netdev_for_each_lower_dev(dev, lower_dev, iter) { + netdev_lock_ops(lower_dev); + netif_disable_gro(lower_dev); + netdev_unlock_ops(lower_dev); + } +} + /** * dev_disable_gro_hw - disable HW Generic Receive Offload on a device * @dev: device diff --git a/net/core/dev_api.c b/net/core/dev_api.c index 437947dd08ed..3ca2515ad048 100644 --- a/net/core/dev_api.c +++ b/net/core/dev_api.c @@ -269,6 +269,27 @@ void dev_disable_lro(struct net_device *dev) } EXPORT_SYMBOL(dev_disable_lro); +/** + * dev_disable_gro() - disable Generic Receive Offload on a device + * @dev: device + * + * Best-effort disable of Generic Receive Offload (GRO) on a net + * device. Must be called under RTNL. This is needed if received + * packets may be forwarded to another interface. + * + * The disable is best-effort: a device with a fixed-on feature (for + * example GRO_HW on a virtio-net device negotiated without + * VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) keeps it enabled. Callers that + * need a hard guarantee must inspect the resulting feature state. + */ +void dev_disable_gro(struct net_device *dev) +{ + netdev_lock_ops(dev); + netif_disable_gro(dev); + netdev_unlock_ops(dev); +} +EXPORT_SYMBOL(dev_disable_gro); + /** * dev_set_promiscuity() - update promiscuity count on a device * @dev: device diff --git a/net/hsr/hsr_slave.c b/net/hsr/hsr_slave.c index 01c73b4b50dd..3cae70754bc4 100644 --- a/net/hsr/hsr_slave.c +++ b/net/hsr/hsr_slave.c @@ -171,6 +171,11 @@ static int hsr_portdev_setup(struct hsr_priv *hsr, struct net_device *dev, goto fail_rx_handler; dev_disable_lro(dev); + /* GRO disabling is best-effort: devices with fixed-on + * GRO/GRO_HW cannot be forced off. + */ + dev_disable_gro(dev); + return 0; fail_rx_handler: -- 2.43.0