linux-kernel - Re: [Intel-wired-lan] [PATCH iwl-next] i40e: flower: validate control flags

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Date: Mon, 6 May 2024 08:44:03 +0000
From: Asbjørn Sloth Tønnesen <ast@...erby.net>
To: "Buvaneswaran, Sujai" <sujai.buvaneswaran@...el.com>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 Eric Dumazet <edumazet@...gle.com>,
 "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 "David S. Miller" <davem@...emloft.net>,
 "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
Subject: Re: [Intel-wired-lan] [PATCH iwl-next] i40e: flower: validate control
 flags

Hi Sujai,

Thank you for testing.

On 5/6/24 5:32 AM, Buvaneswaran, Sujai wrote:
> HW offload is not supported on the i40e interface. This patch cannot be tested on i40e interface.

To me it looks like it's supported (otherwise there is a lot of dead flower code in i40e_main.c),
although it's a bit limited in functionality, and is called "cloud filters".

static const struct net_device_ops i40e_netdev_ops = {
	[...]
	.ndo_setup_tc           = __i40e_setup_tc,
	[...]
};

There is a path from __i40e_setup_tc() to i40e_parse_cls_flower(),
so it should be possible to test this patch.

Most of the gatekeeping is in i40e_configure_clsflower().

I think you should be able to get past the gatekeeping with this:

ethtool -K $iface ntuple off
ethtool -K $iface hw-tc-offload on
tc qdisc add dev $iface ingress
tc filter add dev $iface protocol ip parent ffff: prio 1 flower dst_mac 3c:fd:fe:a0:d6:70 ip_flags frag skip_sw hw_tc 1

The above filter is based on the first example in:
   [jkirsher/next-queue PATCH v5 6/6] i40e: Enable cloud filters via tc-flower
   https://lore.kernel.org/netdev/150909696126.48377.794676088838721605.stgit@anamdev.jf.intel.com/

-- 
Best regards
Asbjørn Sloth Tønnesen
Network Engineer
Fiberby - AS42541