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From: Florian Fainelli <f.fainelli@gmail.com>
To: Vladimir Oltean <olteanv@gmail.com>,
	Jakub Kicinski <kuba@kernel.org>,
	"David S. Miller" <davem@davemloft.net>
Cc: Andrew Lunn <andrew@lunn.ch>,
	Vivien Didelot <vivien.didelot@gmail.com>,
	Tobias Waldekranz <tobias@waldekranz.com>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	Roopa Prabhu <roopa@nvidia.com>,
	Nikolay Aleksandrov <nikolay@nvidia.com>,
	Jiri Pirko <jiri@resnulli.us>, Ido Schimmel <idosch@idosch.org>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	UNGLinuxDriver@microchip.com, Vadym Kochan <vkochan@marvell.com>,
	Taras Chornyi <tchornyi@marvell.com>,
	Grygorii Strashko <grygorii.strashko@ti.com>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	Ioana Ciornei <ioana.ciornei@nxp.com>,
	Ivan Vecera <ivecera@redhat.com>,
	linux-omap@vger.kernel.org,
	Vladimir Oltean <vladimir.oltean@nxp.com>
Subject: Re: [RFC PATCH v2 net-next 14/16] net: dsa: don't set skb->offload_fwd_mark when not offloading the bridge
Date: Mon, 22 Mar 2021 09:06:16 -0700
Message-ID: <0856e923-fdca-93cb-4fe3-4f5c5d811c3c@gmail.com> (raw)
In-Reply-To: <20210318231829.3892920-15-olteanv@gmail.com>



On 3/18/2021 4:18 PM, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@nxp.com>
> 
> DSA has gained the recent ability to deal gracefully with upper
> interfaces it cannot offload, such as the bridge, bonding or team
> drivers. When such uppers exist, the ports are still in standalone mode
> as far as the hardware is concerned.
> 
> But when we deliver packets to the software bridge in order for that to
> do the forwarding, there is an unpleasant surprise in that the bridge
> will refuse to forward them. This is because we unconditionally set
> skb->offload_fwd_mark = true, meaning that the bridge thinks the frames
> were already forwarded in hardware by us.
> 
> Since dp->bridge_dev is populated only when there is hardware offload
> for it, but not in the software fallback case, let's introduce a new
> helper that can be called from the tagger data path which sets the
> skb->offload_fwd_mark accordingly to zero when there is no hardware
> offload for bridging. This lets the bridge forward packets back to other
> interfaces of our switch, if needed.
> 
> Without this change, sending a packet to the CPU for an unoffloaded
> interface triggers this WARN_ON:
> 
> void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
> 			      struct sk_buff *skb)
> {
> 	if (skb->offload_fwd_mark && !WARN_ON_ONCE(!p->offload_fwd_mark))
> 		BR_INPUT_SKB_CB(skb)->offload_fwd_mark = p->offload_fwd_mark;
> }
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
> Reviewed-by: Tobias Waldekranz <tobias@waldekranz.com>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
-- 
Florian

  parent reply index

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-18 23:18 [RFC PATCH v2 net-next 00/16] Better support for sandwiched LAGs with bridge and DSA Vladimir Oltean
2021-03-18 23:18 ` [RFC PATCH v2 net-next 01/16] net: dsa: call dsa_port_bridge_join when joining a LAG that is already in a bridge Vladimir Oltean
2021-03-19 22:04   ` Florian Fainelli
2021-03-22 10:24   ` Tobias Waldekranz
2021-03-18 23:18 ` [RFC PATCH v2 net-next 02/16] net: dsa: pass extack to dsa_port_{bridge,lag}_join Vladimir Oltean
2021-03-19 22:05   ` Florian Fainelli
2021-03-22 10:25   ` Tobias Waldekranz
2021-03-18 23:18 ` [RFC PATCH v2 net-next 03/16] net: dsa: inherit the actual bridge port flags at join time Vladimir Oltean
2021-03-19 22:08   ` Florian Fainelli
2021-03-20 10:05     ` Vladimir Oltean
2021-03-18 23:18 ` [RFC PATCH v2 net-next 04/16] net: dsa: sync up with bridge port's STP state when joining Vladimir Oltean
2021-03-19 22:11   ` Florian Fainelli
2021-03-22 10:29   ` Tobias Waldekranz
2021-03-18 23:18 ` [RFC PATCH v2 net-next 05/16] net: dsa: sync up VLAN filtering state when joining the bridge Vladimir Oltean
2021-03-19 22:11   ` Florian Fainelli
2021-03-22 10:30   ` Tobias Waldekranz
2021-03-18 23:18 ` [RFC PATCH v2 net-next 06/16] net: dsa: sync multicast router " Vladimir Oltean
2021-03-19 22:12   ` Florian Fainelli
2021-03-22 11:17   ` Tobias Waldekranz
2021-03-22 11:43     ` Vladimir Oltean
2021-03-18 23:18 ` [RFC PATCH v2 net-next 07/16] net: dsa: sync ageing time " Vladimir Oltean
2021-03-19 22:13   ` Florian Fainelli
2021-03-20 10:09     ` Vladimir Oltean
2021-03-22 11:20   ` Tobias Waldekranz
2021-03-18 23:18 ` [RFC PATCH v2 net-next 08/16] net: dsa: replay port and host-joined mdb entries " Vladimir Oltean
2021-03-19 22:20   ` Florian Fainelli
2021-03-20  9:53     ` Vladimir Oltean
2021-03-22 15:56       ` Florian Fainelli
2021-03-18 23:18 ` [RFC PATCH v2 net-next 09/16] net: dsa: replay port and local fdb " Vladimir Oltean
2021-03-22 15:44   ` Tobias Waldekranz
2021-03-22 16:19     ` Vladimir Oltean
2021-03-22 17:07       ` Tobias Waldekranz
2021-03-22 17:13         ` Vladimir Oltean
2021-03-18 23:18 ` [RFC PATCH v2 net-next 10/16] net: dsa: replay VLANs installed on port " Vladimir Oltean
2021-03-19 22:24   ` Florian Fainelli
2021-03-18 23:18 ` [RFC PATCH v2 net-next 11/16] net: ocelot: support multiple bridges Vladimir Oltean
2021-03-18 23:18 ` [RFC PATCH v2 net-next 12/16] net: ocelot: call ocelot_netdevice_bridge_join when joining a bridged LAG Vladimir Oltean
2021-03-18 23:18 ` [RFC PATCH v2 net-next 13/16] net: ocelot: replay switchdev events when joining bridge Vladimir Oltean
2021-03-18 23:18 ` [RFC PATCH v2 net-next 14/16] net: dsa: don't set skb->offload_fwd_mark when not offloading the bridge Vladimir Oltean
2021-03-19  8:52   ` DENG Qingfang
2021-03-19  9:06     ` Vladimir Oltean
2021-03-19  9:29       ` DENG Qingfang
2021-03-19 10:49         ` Vladimir Oltean
2021-03-22  8:04           ` DENG Qingfang
2021-03-22 22:23             ` Vladimir Oltean
2021-03-22 16:06   ` Florian Fainelli [this message]
2021-03-18 23:18 ` [RFC PATCH v2 net-next 15/16] net: dsa: return -EOPNOTSUPP when driver does not implement .port_lag_join Vladimir Oltean
2021-03-22 15:51   ` Florian Fainelli
2021-03-22 15:58   ` Tobias Waldekranz
2021-03-18 23:18 ` [RFC PATCH v2 net-next 16/16] net: bridge: switchdev: let drivers inform which bridge ports are offloaded Vladimir Oltean
2021-03-22 16:30   ` Tobias Waldekranz
2021-03-22 17:19     ` Vladimir Oltean

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