[PATCH net] ice: Clear default forwarding VSI during VSI release

[PATCH net] ice: Clear default forwarding VSI during VSI release

[Ivan Vecera]

VSI is set as default forwarding one when promisc mode is set for
PF interface, when PF is switched to switchdev mode or when VF
driver asks to enable allmulticast or promisc mode for the VF
interface (when vf-true-promisc-support priv flag is off).
The third case is buggy because in that case VSI associated with
VF remains as default one after VF removal.

Reproducer:
1. Create VF
   echo 1 > sys/class/net/ens7f0/device/sriov_numvfs
2. Enable allmulticast or promisc mode on VF
   ip link set ens7f0v0 allmulticast on
   ip link set ens7f0v0 promisc on
3. Delete VF
   echo 0 > sys/class/net/ens7f0/device/sriov_numvfs
4. Try to enable promisc mode on PF
   ip link set ens7f0 promisc on

Although it looks that promisc mode on PF is enabled the opposite
is true because ice_vsi_sync_fltr() responsible for IFF_PROMISC
handling first checks if any other VSI is set as default forwarding
one and if so the function does not do anything. At this point
it is not possible to enable promisc mode on PF without re-probe
device.

To resolve the issue this patch clear default forwarding VSI
during ice_vsi_release() when the VSI to be released is the default
one.

Fixes: 01b5e89aab49 ("ice: Add VF promiscuous support")
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
---
 drivers/net/ethernet/intel/ice/ice_lib.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
index 53256aca27c7..20d755822d43 100644
--- a/drivers/net/ethernet/intel/ice/ice_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_lib.c
@@ -3147,6 +3147,8 @@ int ice_vsi_release(struct ice_vsi *vsi)
 		}
 	}
 
+	if (ice_is_vsi_dflt_vsi(pf->first_sw, vsi))
+		ice_clear_dflt_vsi(pf->first_sw);
 	ice_fltr_remove_all(vsi);
 	ice_rm_vsi_lan_cfg(vsi->port_info, vsi->idx);
 	err = ice_rm_vsi_rdma_cfg(vsi->port_info, vsi->idx);
-- 
2.34.1

Re: [PATCH net] ice: Clear default forwarding VSI during VSI release

[Marcin Szycik]

On 22-Mar-22 15:25, Ivan Vecera wrote:
> VSI is set as default forwarding one when promisc mode is set for
> PF interface, when PF is switched to switchdev mode or when VF
> driver asks to enable allmulticast or promisc mode for the VF
> interface (when vf-true-promisc-support priv flag is off).
> The third case is buggy because in that case VSI associated with
> VF remains as default one after VF removal.
> 
> Reproducer:
> 1. Create VF
>    echo 1 > sys/class/net/ens7f0/device/sriov_numvfs
> 2. Enable allmulticast or promisc mode on VF
>    ip link set ens7f0v0 allmulticast on
>    ip link set ens7f0v0 promisc on
> 3. Delete VF
>    echo 0 > sys/class/net/ens7f0/device/sriov_numvfs
> 4. Try to enable promisc mode on PF
>    ip link set ens7f0 promisc on
> 
> Although it looks that promisc mode on PF is enabled the opposite
> is true because ice_vsi_sync_fltr() responsible for IFF_PROMISC
> handling first checks if any other VSI is set as default forwarding
> one and if so the function does not do anything. At this point
> it is not possible to enable promisc mode on PF without re-probe
> device.
> 
> To resolve the issue this patch clear default forwarding VSI
> during ice_vsi_release() when the VSI to be released is the default
> one.
> 
> Fixes: 01b5e89aab49 ("ice: Add VF promiscuous support")
> Signed-off-by: Ivan Vecera <ivecera@redhat.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_lib.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
> index 53256aca27c7..20d755822d43 100644
> --- a/drivers/net/ethernet/intel/ice/ice_lib.c
> +++ b/drivers/net/ethernet/intel/ice/ice_lib.c
> @@ -3147,6 +3147,8 @@ int ice_vsi_release(struct ice_vsi *vsi)
>  		}
>  	}
>  
> +	if (ice_is_vsi_dflt_vsi(pf->first_sw, vsi))
> +		ice_clear_dflt_vsi(pf->first_sw);

It would probably be good to check `ice_clear_dflt_vsi` return code.

>  	ice_fltr_remove_all(vsi);
>  	ice_rm_vsi_lan_cfg(vsi->port_info, vsi->idx);
>  	err = ice_rm_vsi_rdma_cfg(vsi->port_info, vsi->idx);

Re: [PATCH net] ice: Clear default forwarding VSI during VSI release

[Marcin Szycik]

On 23-Mar-22 18:54, Ivan Vecera wrote:
> On Wed, 23 Mar 2022 18:39:11 +0100
> Marcin Szycik <marcin.szycik@linux.intel.com> wrote:
> 
>> On 22-Mar-22 15:25, Ivan Vecera wrote:
>>> VSI is set as default forwarding one when promisc mode is set for
>>> PF interface, when PF is switched to switchdev mode or when VF
>>> driver asks to enable allmulticast or promisc mode for the VF
>>> interface (when vf-true-promisc-support priv flag is off).
>>> The third case is buggy because in that case VSI associated with
>>> VF remains as default one after VF removal.
>>>
>>> Reproducer:
>>> 1. Create VF
>>>    echo 1 > sys/class/net/ens7f0/device/sriov_numvfs
>>> 2. Enable allmulticast or promisc mode on VF
>>>    ip link set ens7f0v0 allmulticast on
>>>    ip link set ens7f0v0 promisc on
>>> 3. Delete VF
>>>    echo 0 > sys/class/net/ens7f0/device/sriov_numvfs
>>> 4. Try to enable promisc mode on PF
>>>    ip link set ens7f0 promisc on
>>>
>>> Although it looks that promisc mode on PF is enabled the opposite
>>> is true because ice_vsi_sync_fltr() responsible for IFF_PROMISC
>>> handling first checks if any other VSI is set as default forwarding
>>> one and if so the function does not do anything. At this point
>>> it is not possible to enable promisc mode on PF without re-probe
>>> device.
>>>
>>> To resolve the issue this patch clear default forwarding VSI
>>> during ice_vsi_release() when the VSI to be released is the default
>>> one.
>>>
>>> Fixes: 01b5e89aab49 ("ice: Add VF promiscuous support")
>>> Signed-off-by: Ivan Vecera <ivecera@redhat.com>
>>> ---
>>>  drivers/net/ethernet/intel/ice/ice_lib.c | 2 ++
>>>  1 file changed, 2 insertions(+)
>>>
>>> diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
>>> index 53256aca27c7..20d755822d43 100644
>>> --- a/drivers/net/ethernet/intel/ice/ice_lib.c
>>> +++ b/drivers/net/ethernet/intel/ice/ice_lib.c
>>> @@ -3147,6 +3147,8 @@ int ice_vsi_release(struct ice_vsi *vsi)
>>>  		}
>>>  	}
>>>  
>>> +	if (ice_is_vsi_dflt_vsi(pf->first_sw, vsi))
>>> +		ice_clear_dflt_vsi(pf->first_sw);  
>>
>> It would probably be good to check `ice_clear_dflt_vsi` return code.
> 
> Check and report potential warning when error occurs? because we are in ice_vsi_release() so
> any rollback does not make sense.

Right. ice_clear_dflt_vsi already reports errors so it should be good as is.
LGTM, thanks!

> 
> Ivan
> 

Re: [PATCH net] ice: Clear default forwarding VSI during VSI release

[Maciej Fijalkowski]

On Wed, Mar 23, 2022 at 07:19:55PM +0100, Marcin Szycik wrote:
> 
> 
> On 23-Mar-22 18:54, Ivan Vecera wrote:
> > On Wed, 23 Mar 2022 18:39:11 +0100
> > Marcin Szycik <marcin.szycik@linux.intel.com> wrote:
> > 
> >> On 22-Mar-22 15:25, Ivan Vecera wrote:
> >>> VSI is set as default forwarding one when promisc mode is set for
> >>> PF interface, when PF is switched to switchdev mode or when VF
> >>> driver asks to enable allmulticast or promisc mode for the VF
> >>> interface (when vf-true-promisc-support priv flag is off).
> >>> The third case is buggy because in that case VSI associated with
> >>> VF remains as default one after VF removal.
> >>>
> >>> Reproducer:
> >>> 1. Create VF
> >>>    echo 1 > sys/class/net/ens7f0/device/sriov_numvfs
> >>> 2. Enable allmulticast or promisc mode on VF
> >>>    ip link set ens7f0v0 allmulticast on
> >>>    ip link set ens7f0v0 promisc on
> >>> 3. Delete VF
> >>>    echo 0 > sys/class/net/ens7f0/device/sriov_numvfs
> >>> 4. Try to enable promisc mode on PF
> >>>    ip link set ens7f0 promisc on
> >>>
> >>> Although it looks that promisc mode on PF is enabled the opposite
> >>> is true because ice_vsi_sync_fltr() responsible for IFF_PROMISC
> >>> handling first checks if any other VSI is set as default forwarding
> >>> one and if so the function does not do anything. At this point
> >>> it is not possible to enable promisc mode on PF without re-probe
> >>> device.
> >>>
> >>> To resolve the issue this patch clear default forwarding VSI

tiny nit:
s/clear/clears

Also it's more welcome to use imperative mood.

> >>> during ice_vsi_release() when the VSI to be released is the default
> >>> one.
> >>>
> >>> Fixes: 01b5e89aab49 ("ice: Add VF promiscuous support")
> >>> Signed-off-by: Ivan Vecera <ivecera@redhat.com>
> >>> ---
> >>>  drivers/net/ethernet/intel/ice/ice_lib.c | 2 ++
> >>>  1 file changed, 2 insertions(+)
> >>>
> >>> diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
> >>> index 53256aca27c7..20d755822d43 100644
> >>> --- a/drivers/net/ethernet/intel/ice/ice_lib.c
> >>> +++ b/drivers/net/ethernet/intel/ice/ice_lib.c
> >>> @@ -3147,6 +3147,8 @@ int ice_vsi_release(struct ice_vsi *vsi)
> >>>  		}
> >>>  	}
> >>>  
> >>> +	if (ice_is_vsi_dflt_vsi(pf->first_sw, vsi))
> >>> +		ice_clear_dflt_vsi(pf->first_sw);  
> >>
> >> It would probably be good to check `ice_clear_dflt_vsi` return code.
> > 
> > Check and report potential warning when error occurs? because we are in ice_vsi_release() so
> > any rollback does not make sense.

I believe that comment wouldn't hurt that it's ok to ignore the retval,
but then again i'm fine with what it is currently :)

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>

> 
> Right. ice_clear_dflt_vsi already reports errors so it should be good as is.
> LGTM, thanks!
> 
> > 
> > Ivan
> > 

Re: [Intel-wired-lan] [PATCH net] ice: Clear default forwarding VSI during VSI release

[Michal Swiatkowski]

On Tue, Mar 22, 2022 at 03:25:54PM +0100, Ivan Vecera wrote:
> VSI is set as default forwarding one when promisc mode is set for
> PF interface, when PF is switched to switchdev mode or when VF
> driver asks to enable allmulticast or promisc mode for the VF
> interface (when vf-true-promisc-support priv flag is off).
> The third case is buggy because in that case VSI associated with
> VF remains as default one after VF removal.
> 
> Reproducer:
> 1. Create VF
>    echo 1 > sys/class/net/ens7f0/device/sriov_numvfs
> 2. Enable allmulticast or promisc mode on VF
>    ip link set ens7f0v0 allmulticast on
>    ip link set ens7f0v0 promisc on
> 3. Delete VF
>    echo 0 > sys/class/net/ens7f0/device/sriov_numvfs
> 4. Try to enable promisc mode on PF
>    ip link set ens7f0 promisc on
> 
> Although it looks that promisc mode on PF is enabled the opposite
> is true because ice_vsi_sync_fltr() responsible for IFF_PROMISC
> handling first checks if any other VSI is set as default forwarding
> one and if so the function does not do anything. At this point
> it is not possible to enable promisc mode on PF without re-probe
> device.
> 
> To resolve the issue this patch clear default forwarding VSI
> during ice_vsi_release() when the VSI to be released is the default
> one.
> 
> Fixes: 01b5e89aab49 ("ice: Add VF promiscuous support")
> Signed-off-by: Ivan Vecera <ivecera@redhat.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_lib.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
> index 53256aca27c7..20d755822d43 100644
> --- a/drivers/net/ethernet/intel/ice/ice_lib.c
> +++ b/drivers/net/ethernet/intel/ice/ice_lib.c
> @@ -3147,6 +3147,8 @@ int ice_vsi_release(struct ice_vsi *vsi)
>  		}
>  	}
>  
> +	if (ice_is_vsi_dflt_vsi(pf->first_sw, vsi))
> +		ice_clear_dflt_vsi(pf->first_sw);
>  	ice_fltr_remove_all(vsi);
>  	ice_rm_vsi_lan_cfg(vsi->port_info, vsi->idx);
>  	err = ice_rm_vsi_rdma_cfg(vsi->port_info, vsi->idx);
Thanks for fixing it.
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>

> -- 
> 2.34.1
> 
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