[PATCH iwl-next] i40e: flower: validate control flags

[PATCH iwl-next] i40e: flower: validate control flags

[Asbjørn Sloth Tønnesen]

This driver currently doesn't support any control flags.

Use flow_rule_has_control_flags() to check for control flags,
such as can be set through `tc flower ... ip_flags frag`.

In case any control flags are masked, flow_rule_has_control_flags()
sets a NL extended error message, and we return -EOPNOTSUPP.

Only compile-tested.

Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 0bdcdea0be3e..e219f757820d 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -8643,6 +8643,10 @@ static int i40e_parse_cls_flower(struct i40e_vsi *vsi,
 
 		flow_rule_match_control(rule, &match);
 		addr_type = match.key->addr_type;
+
+		if (flow_rule_has_control_flags(match.mask->flags,
+						f->common.extack))
+			return -EOPNOTSUPP;
 	}
 
 	if (addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
-- 
2.43.0

Re: [PATCH iwl-next] i40e: flower: validate control flags

[Simon Horman]

On Tue, Apr 16, 2024 at 02:43:19PM +0000, Asbjørn Sloth Tønnesen wrote:
> This driver currently doesn't support any control flags.
> 
> Use flow_rule_has_control_flags() to check for control flags,
> such as can be set through `tc flower ... ip_flags frag`.
> 
> In case any control flags are masked, flow_rule_has_control_flags()
> sets a NL extended error message, and we return -EOPNOTSUPP.
> 
> Only compile-tested.
> 
> Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>

Reviewed-by: Simon Horman <horms@kernel.org>

RE: [Intel-wired-lan] [PATCH iwl-next] i40e: flower: validate control flags

[Buvaneswaran, Sujai]

Hi Asbjørn,

HW offload is not supported on the i40e interface. This patch cannot be tested on i40e interface.

Regards,
Sujai B

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Asbjørn Sloth Tønnesen
> Sent: Tuesday, April 16, 2024 8:13 PM
> To: intel-wired-lan@lists.osuosl.org
> Cc: netdev@vger.kernel.org; linux-kernel@vger.kernel.org; Eric Dumazet
> <edumazet@google.com>; Nguyen, Anthony L
> <anthony.l.nguyen@intel.com>; Asbjørn Sloth Tønnesen <ast@fiberby.net>;
> Jakub Kicinski <kuba@kernel.org>; Paolo Abeni <pabeni@redhat.com>;
> David S. Miller <davem@davemloft.net>
> Subject: [Intel-wired-lan] [PATCH iwl-next] i40e: flower: validate control flags
> 
> This driver currently doesn't support any control flags.
> 
> Use flow_rule_has_control_flags() to check for control flags, such as can be
> set through `tc flower ... ip_flags frag`.
> 
> In case any control flags are masked, flow_rule_has_control_flags() sets a NL
> extended error message, and we return -EOPNOTSUPP.
> 
> Only compile-tested.
> 
> Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
> ---
>  drivers/net/ethernet/intel/i40e/i40e_main.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c
> b/drivers/net/ethernet/intel/i40e/i40e_main.c
> index 0bdcdea0be3e..e219f757820d 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_main.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
> @@ -8643,6 +8643,10 @@ static int i40e_parse_cls_flower(struct i40e_vsi
> *vsi,
> 
>  		flow_rule_match_control(rule, &match);
>  		addr_type = match.key->addr_type;
> +
> +		if (flow_rule_has_control_flags(match.mask->flags,
> +						f->common.extack))
> +			return -EOPNOTSUPP;
>  	}
> 
>  	if (addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
> --
> 2.43.0

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

[Asbjørn Sloth Tønnesen]

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

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

[Samudrala, Sridhar]

On 5/6/2024 1:44 AM, Asbjørn Sloth Tønnesen wrote:
> 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

One step is missing before adding the filter.
In order to use hw_tc action, queue groups need to be created and can be 
done using

tc qdisc add dev $iface root mqprio num_tc 2 map 0 1 queues 2@0 8@2 hw 1 
mode channel

> 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/
> 

RE: [Intel-wired-lan] [PATCH iwl-next] i40e: flower: validate control flags

[Buvaneswaran, Sujai]

Hi,

I'm able to test this patch on i40e interface from ADQ perspective. Getting 'Not supported' message when tried to configure tc rule with control flags.

[root@BP-node3-BINDU ~]# rmmod i40e
rmmod: ERROR: Module i40e is in use by: irdma
[root@BP-node3-BINDU ~]#  modprobe i40e
[root@BP-node3-BINDU ~]#  ethtool -K ens801f0np0 ntuple off
[root@BP-node3-BINDU ~]#  ethtool -K ens801f0np0 hw-tc-offload on
[root@BP-node3-BINDU ~]#  tc qdisc add dev ens801f0np0 ingress
[root@BP-node3-BINDU ~]#  tc qdisc add dev ens801f0np0 root mqprio num_tc 2 map 0 1 queues 2@0 8@2 hw 1 mode channel
[root@BP-node3-BINDU ~]# tc filter add dev ens801f0np0 protocol ip parent ffff: prio 1 flower dst_ip 192.168.1.10 ip_proto tcp dst_port 12000 ip_flags frag skip_sw hw_tc 1
RTNETLINK answers: Operation not supported
We have an error talking to the kernel
[root@BP-node3-BINDU ~]# tc filter add dev ens801f0np0 protocol ip parent ffff: prio 1 flower dst_ip 192.168.1.10 ip_proto tcp dst_port 12000 ip_flags frag/firstfrag  skip_sw hw_tc 1
RTNETLINK answers: Operation not supported
We have an error talking to the kernel
[root@BP-node3-BINDU ~]# tc filter add dev ens801f0np0 protocol ip parent ffff: prio 1 flower dst_ip 192.168.1.10 ip_proto tcp dst_port 12000 skip_sw hw_tc 1
[root@BP-node3-BINDU ~]# tc filter show dev ens801f0np0 root
filter parent ffff: protocol ip pref 1 flower chain 0 
filter parent ffff: protocol ip pref 1 flower chain 0 handle 0x1 hw_tc 1 
  eth_type ipv4
  ip_proto tcp
  dst_ip 192.168.1.10
  dst_port 12000
  skip_sw
  in_hw in_hw_count 1
[root@BP-node3-BINDU ~]# tc filter add dev ens801f0np0 protocol ip parent ffff: prio 1 flower dst_ip 192.168.1.10 ip_proto tcp dst_port 12000 ip_flags frag/firstfrag hw_tc 1
[root@BP-node3-BINDU ~]# tc filter show dev ens801f0np0 root
filter parent ffff: protocol ip pref 1 flower chain 0 
filter parent ffff: protocol ip pref 1 flower chain 0 handle 0x1 hw_tc 1 
  eth_type ipv4
  ip_proto tcp
  dst_ip 192.168.1.10
  dst_port 12000
  skip_sw
  in_hw in_hw_count 1
filter parent ffff: protocol ip pref 1 flower chain 0 handle 0x2 hw_tc 1 
  eth_type ipv4
  ip_proto tcp
  dst_ip 192.168.1.10
  dst_port 12000
  ip_flags frag/firstfrag
  not_in_hw

Regards,
Sujai B

> -----Original Message-----
> From: Samudrala, Sridhar <sridhar.samudrala@intel.com>
> Sent: Monday, May 6, 2024 11:25 PM
> To: Asbjørn Sloth Tønnesen <ast@fiberby.net>; Buvaneswaran, Sujai
> <sujai.buvaneswaran@intel.com>
> Cc: netdev@vger.kernel.org; linux-kernel@vger.kernel.org; Eric Dumazet
> <edumazet@google.com>; Nguyen, Anthony L
> <anthony.l.nguyen@intel.com>; Jakub Kicinski <kuba@kernel.org>; Paolo
> Abeni <pabeni@redhat.com>; David S. Miller <davem@davemloft.net>;
> intel-wired-lan@lists.osuosl.org
> Subject: Re: [Intel-wired-lan] [PATCH iwl-next] i40e: flower: validate control
> flags
> 
> 
> 
> On 5/6/2024 1:44 AM, Asbjørn Sloth Tønnesen wrote:
> > 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
> 
> One step is missing before adding the filter.
> In order to use hw_tc action, queue groups need to be created and can be
> done using
> 
> tc qdisc add dev $iface root mqprio num_tc 2 map 0 1 queues 2@0 8@2 hw 1
> mode channel
> 
> > 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.s
> > tgit@anamdev.jf.intel.com/
> >

RE: [Intel-wired-lan] [PATCH iwl-next] i40e: flower: validate control flags

[Buvaneswaran, Sujai]

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Asbjørn Sloth Tønnesen
> Sent: Tuesday, April 16, 2024 8:13 PM
> To: intel-wired-lan@lists.osuosl.org
> Cc: netdev@vger.kernel.org; linux-kernel@vger.kernel.org; Eric Dumazet
> <edumazet@google.com>; Nguyen, Anthony L
> <anthony.l.nguyen@intel.com>; Asbjørn Sloth Tønnesen <ast@fiberby.net>;
> Jakub Kicinski <kuba@kernel.org>; Paolo Abeni <pabeni@redhat.com>;
> David S. Miller <davem@davemloft.net>
> Subject: [Intel-wired-lan] [PATCH iwl-next] i40e: flower: validate control flags
> 
> This driver currently doesn't support any control flags.
> 
> Use flow_rule_has_control_flags() to check for control flags, such as can be
> set through `tc flower ... ip_flags frag`.
> 
> In case any control flags are masked, flow_rule_has_control_flags() sets a NL
> extended error message, and we return -EOPNOTSUPP.
> 
> Only compile-tested.
> 
> Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
> ---
>  drivers/net/ethernet/intel/i40e/i40e_main.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
Tested-by: Sujai Buvaneswaran <sujai.buvaneswaran@intel.com>