netdev - Re: [Intel-wired-lan] [iwl-next v1 1/2] ice: tc: check src

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Date: Tue, 20 Feb 2024 13:24:29 +0100
From: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
To: Paul Menzel <pmenzel@...gen.mpg.de>
Cc: wojciech.drewek@...el.com, marcin.szycik@...el.com,
	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	Jedrzej Jagielski <jedrzej.jagielski@...el.com>,
	sridhar.samudrala@...el.com
Subject: Re: [Intel-wired-lan] [iwl-next v1 1/2] ice: tc: check src_vsi in
 case of traffic from VF

On Tue, Feb 20, 2024 at 12:23:11PM +0100, Paul Menzel wrote:
> Dear Michal,
> 
> 
> Thank you for the patch.
>

Thanks for the review.

> Am 20.02.24 um 11:59 schrieb Michal Swiatkowski:
> > In case of traffic going from the VF (so ingress for port representor)
> > there should be a check for source VSI. It is needed for hardware to not
> > match packets from different port with filters added on other port.
> 
> … from different port*s* …?
> 

Will fix it.

> > It is only for "from VF" traffic, because other traffic direction
> > doesn't have source VSI.
> 
> Do you have a test case to reproduce this?
>

I can add tc fileter call in v2. In short, any redirect from VF0 to
uplink should allow going packets only from VF0, but currently it is
also matching traffic from other VFs (like VF1, VF2, etc.)

> > Reviewed-by: Jedrzej Jagielski <jedrzej.jagielski@...el.com>
> > Reviewed-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
> > Signed-off-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
> > ---
> >   drivers/net/ethernet/intel/ice/ice_tc_lib.c | 8 ++++++++
> >   1 file changed, 8 insertions(+)
> > 
> > diff --git a/drivers/net/ethernet/intel/ice/ice_tc_lib.c b/drivers/net/ethernet/intel/ice/ice_tc_lib.c
> > index b890410a2bc0..49ed5fd7db10 100644
> > --- a/drivers/net/ethernet/intel/ice/ice_tc_lib.c
> > +++ b/drivers/net/ethernet/intel/ice/ice_tc_lib.c
> > @@ -28,6 +28,8 @@ ice_tc_count_lkups(u32 flags, struct ice_tc_flower_lyr_2_4_hdrs *headers,
> >   	 * - ICE_TC_FLWR_FIELD_VLAN_TPID (present if specified)
> >   	 * - Tunnel flag (present if tunnel)
> >   	 */
> > +	if (fltr->direction == ICE_ESWITCH_FLTR_EGRESS)
> > +		lkups_cnt++;
> 
> Why does the count variable need to be incremented?
>
AS you wrote belowe it is needed to add another lookup.

> >   	if (flags & ICE_TC_FLWR_FIELD_TENANT_ID)
> >   		lkups_cnt++;
> > @@ -363,6 +365,11 @@ ice_tc_fill_rules(struct ice_hw *hw, u32 flags,
> >   	/* Always add direction metadata */
> >   	ice_rule_add_direction_metadata(&list[ICE_TC_METADATA_LKUP_IDX]);
> > +	if (tc_fltr->direction == ICE_ESWITCH_FLTR_EGRESS) {
> > +		ice_rule_add_src_vsi_metadata(&list[i]);
> > +		i++;
> > +	}
> > +
> >   	rule_info->tun_type = ice_sw_type_from_tunnel(tc_fltr->tunnel_type);
> >   	if (tc_fltr->tunnel_type != TNL_LAST) {
> >   		i = ice_tc_fill_tunnel_outer(flags, tc_fltr, list, i);
> > @@ -820,6 +827,7 @@ ice_eswitch_add_tc_fltr(struct ice_vsi *vsi, struct ice_tc_flower_fltr *fltr)
> >   	/* specify the cookie as filter_rule_id */
> >   	rule_info.fltr_rule_id = fltr->cookie;
> > +	rule_info.src_vsi = vsi->idx;
> 
> Besides the comment above being redundant (as the code does exactly that),
> the new line looks like to belong to the comment. Please excuse my
> ignorance, but the commit message only talks about adding checks and not
> overwriting the `src_vsi`. It’d be great, if you could elaborate.
>

I will rephrase commit message to mark that it is not checking in code,
but matching in hardware, thanks.

> >   	ret = ice_add_adv_rule(hw, list, lkups_cnt, &rule_info, &rule_added);
> >   	if (ret == -EEXIST) {
> 
> 
> Kind regards,
> 
> Paul