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Message-ID: <eb6538d9-4667-f1f5-492c-e1e113a6da35@linux.intel.com> Date: Wed, 23 Mar 2022 21:05:20 +0100 From: Marcin Szycik <marcin.szycik@...ux.intel.com> To: Ivan Vecera <ivecera@...hat.com>, netdev@...r.kernel.org Cc: poros@...hat.com, mschmidt@...hat.com, Jesse Brandeburg <jesse.brandeburg@...el.com>, Tony Nguyen <anthony.l.nguyen@...el.com>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Jeff Kirsher <jeffrey.t.kirsher@...el.com>, Akeem G Abodunrin <akeem.g.abodunrin@...el.com>, Anirudh Venkataramanan <anirudh.venkataramanan@...el.com>, "moderated list:INTEL ETHERNET DRIVERS" <intel-wired-lan@...ts.osuosl.org>, open list <linux-kernel@...r.kernel.org> Subject: Re: [PATCH net] ice: Fix broken IFF_ALLMULTI handling On 21-Mar-22 20:17, Ivan Vecera wrote: > Handling of all-multicast flag and associated multicast promiscuous > mode is broken in ice driver. When a user switches allmulticast > flag on or off the driver checks whether any VLANs are configured > over the interface (except default VLAN 0). > > If any extra VLANs are registered it enables multicast promiscuous > mode for all these VLANs (including default VLAN 0) using > ICE_SW_LKUP_PROMISC_VLAN look-up type. In this situation all > multicast packets tagged with known VLAN ID or untagged are received > and multicast packets tagged with unknown VLAN ID ignored. > > If no extra VLANs are registered (so only VLAN 0 exists) it enables > multicast promiscuous mode for VLAN 0 and uses ICE_SW_LKUP_PROMISC > look-up type. In this situation any multicast packets including > tagged ones are received. > > The driver handles IFF_ALLMULTI in ice_vsi_sync_fltr() this way: > > ice_vsi_sync_fltr() { > ... > if (changed_flags & IFF_ALLMULTI) { > if (netdev->flags & IFF_ALLMULTI) { > if (vsi->num_vlans > 1) > ice_set_promisc(..., ICE_MCAST_VLAN_PROMISC_BITS); > else > ice_set_promisc(..., ICE_MCAST_PROMISC_BITS); > } else { > if (vsi->num_vlans > 1) > ice_clear_promisc(..., ICE_MCAST_VLAN_PROMISC_BITS); > else > ice_clear_promisc(..., ICE_MCAST_PROMISC_BITS); > } > } > ... > } > > The code above depends on value vsi->num_vlan that specifies number > of VLANs configured over the interface (including VLAN 0) and > this is problem because that value is modified in NDO callbacks > ice_vlan_rx_add_vid() and ice_vlan_rx_kill_vid(). > > Scenario 1: > 1. ip link set ens7f0 allmulticast on > 2. ip link add vlan10 link ens7f0 type vlan id 10 > 3. ip link set ens7f0 allmulticast off > 4. ip link set ens7f0 allmulticast on > > [1] In this scenario IFF_ALLMULTI is enabled and the driver calls > ice_set_promisc(..., ICE_MCAST_PROMISC_BITS) that installs > multicast promisc rule with non-VLAN look-up type. > [2] Then VLAN with ID 10 is added and vsi->num_vlan incremented to 2 > [3] Command switches IFF_ALLMULTI off and the driver calls > ice_clear_promisc(..., ICE_MCAST_VLAN_PROMISC_BITS) but this > call is effectively NOP because it looks for multicast promisc > rules for VLAN 0 and VLAN 10 with VLAN look-up type but no such > rules exist. So the all-multicast remains enabled silently > in hardware. > [4] Command tries to switch IFF_ALLMULTI on and the driver calls > ice_clear_promisc(..., ICE_MCAST_PROMISC_BITS) but this call > fails (-EEXIST) because non-VLAN multicast promisc rule already > exists. > > Scenario 2: > 1. ip link add vlan10 link ens7f0 type vlan id 10 > 2. ip link set ens7f0 allmulticast on > 3. ip link add vlan20 link ens7f0 type vlan id 20 > 4. ip link del vlan10 ; ip link del vlan20 > 5. ip link set ens7f0 allmulticast off > > [1] VLAN with ID 10 is added and vsi->num_vlan==2 > [2] Command switches IFF_ALLMULTI on and driver installs multicast > promisc rules with VLAN look-up type for VLAN 0 and 10 > [3] VLAN with ID 20 is added and vsi->num_vlan==3 but no multicast > promisc rules is added for this new VLAN so the interface does > not receive MC packets from VLAN 20 > [4] Both VLANs are removed but multicast rule for VLAN 10 remains > installed so interface receives multicast packets from VLAN 10 > [5] Command switches IFF_ALLMULTI off and because vsi->num_vlan is 1 > the driver tries to remove multicast promisc rule for VLAN 0 > with non-VLAN look-up that does not exist. > All-multicast looks disabled from user point of view but it > is partially enabled in HW (interface receives all multicast > packets either untagged or tagged with VLAN ID 10) > > To resolve these issues the patch introduces these changes: > 1. Adds handling for IFF_ALLMULTI to ice_vlan_rx_add_vid() and > ice_vlan_rx_kill_vid() callbacks. So when VLAN is added/removed > and IFF_ALLMULTI is enabled an appropriate multicast promisc > rule for that VLAN ID is added/removed. > 2. In ice_vlan_rx_add_vid() when first VLAN besides VLAN 0 is added > so (vsi->num_vlan == 2) and IFF_ALLMULTI is enabled then look-up > type for existing multicast promisc rule for VLAN 0 is updated > to ICE_MCAST_VLAN_PROMISC_BITS. > 3. In ice_vlan_rx_kill_vid() when last VLAN besides VLAN 0 is removed > so (vsi->num_vlan == 1) and IFF_ALLMULTI is enabled then look-up > type for existing multicast promisc rule for VLAN 0 is updated > to ICE_MCAST_PROMISC_BITS. > 4. Both ice_vlan_rx_{add,kill}_vid() have to run under ICE_CFG_BUSY > bit protection to avoid races with ice_vsi_sync_fltr() that runs > in ice_service_task() context. > 5. Bit ICE_VSI_VLAN_FLTR_CHANGED is use-less and can be removed. > 6. Error messages added to ice_fltr_*_vsi_promisc() helper functions > to avoid them in their callers > 7. Small improvements to increase readability > > Fixes: 5eda8afd6bcc ("ice: Add support for PF/VF promiscuous mode") > Signed-off-by: Ivan Vecera <ivecera@...hat.com> > --- > drivers/net/ethernet/intel/ice/ice.h | 1 - > drivers/net/ethernet/intel/ice/ice_fltr.c | 52 +++++++++- > drivers/net/ethernet/intel/ice/ice_main.c | 119 +++++++++++++++------- > 3 files changed, 131 insertions(+), 41 deletions(-) > > diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h > index bea1d1e39fa2..717542e49d65 100644 > --- a/drivers/net/ethernet/intel/ice/ice.h > +++ b/drivers/net/ethernet/intel/ice/ice.h > @@ -300,7 +300,6 @@ enum ice_vsi_state { > ICE_VSI_NETDEV_REGISTERED, > ICE_VSI_UMAC_FLTR_CHANGED, > ICE_VSI_MMAC_FLTR_CHANGED, > - ICE_VSI_VLAN_FLTR_CHANGED, > ICE_VSI_PROMISC_CHANGED, > ICE_VSI_STATE_NBITS /* must be last */ > }; > diff --git a/drivers/net/ethernet/intel/ice/ice_fltr.c b/drivers/net/ethernet/intel/ice/ice_fltr.c > index c29177c6bb9d..8ed87b43a367 100644 > --- a/drivers/net/ethernet/intel/ice/ice_fltr.c > +++ b/drivers/net/ethernet/intel/ice/ice_fltr.c > @@ -58,7 +58,18 @@ int > ice_fltr_set_vlan_vsi_promisc(struct ice_hw *hw, struct ice_vsi *vsi, > u8 promisc_mask) > { > - return ice_set_vlan_vsi_promisc(hw, vsi->idx, promisc_mask, false); > + struct ice_pf *pf = hw->back; > + int result; > + > + result = ice_set_vlan_vsi_promisc(hw, vsi->idx, promisc_mask, false); > + if (!result) > + return result; > + > + dev_err(ice_pf_to_dev(pf), > + "Error setting promisc mode on VSI %i (rc=%d)\n", vsi->vsi_num, > + result); > + > + return result; > } > > /** > @@ -73,7 +84,18 @@ int > ice_fltr_clear_vlan_vsi_promisc(struct ice_hw *hw, struct ice_vsi *vsi, > u8 promisc_mask) > { > - return ice_set_vlan_vsi_promisc(hw, vsi->idx, promisc_mask, true); > + struct ice_pf *pf = hw->back; > + int result; > + > + result = ice_set_vlan_vsi_promisc(hw, vsi->idx, promisc_mask, true); > + if (!result) > + return result; > + > + dev_err(ice_pf_to_dev(pf), > + "Error clearing promisc mode on VSI %i (rc=%d)\n", > + vsi->vsi_num, result); > + > + return result; > } > > /** > @@ -87,7 +109,18 @@ int > ice_fltr_clear_vsi_promisc(struct ice_hw *hw, u16 vsi_handle, u8 promisc_mask, > u16 vid) > { > - return ice_clear_vsi_promisc(hw, vsi_handle, promisc_mask, vid); > + struct ice_pf *pf = hw->back; > + int result; > + > + result = ice_clear_vsi_promisc(hw, vsi_handle, promisc_mask, vid); > + if (!result) > + return result; > + > + dev_err(ice_pf_to_dev(pf), > + "Error clearing promisc mode on VSI %i for VID %u (rc=%d)\n", > + ice_get_hw_vsi_num(hw, vsi_handle), vid, result); > + > + return result; > } > > /** > @@ -101,7 +134,18 @@ int > ice_fltr_set_vsi_promisc(struct ice_hw *hw, u16 vsi_handle, u8 promisc_mask, > u16 vid) > { > - return ice_set_vsi_promisc(hw, vsi_handle, promisc_mask, vid); > + struct ice_pf *pf = hw->back; > + int result; > + > + result = ice_set_vsi_promisc(hw, vsi_handle, promisc_mask, vid); > + if (!result) > + return result; > + > + dev_err(ice_pf_to_dev(pf), > + "Error setting promisc mode on VSI %i for VID %u (rc=%d)\n", > + ice_get_hw_vsi_num(hw, vsi_handle), vid, result); > + > + return result; > } > > /** > diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c > index b7e8744b0c0a..168a41ea37b8 100644 > --- a/drivers/net/ethernet/intel/ice/ice_main.c > +++ b/drivers/net/ethernet/intel/ice/ice_main.c > @@ -227,8 +227,7 @@ static int ice_add_mac_to_unsync_list(struct net_device *netdev, const u8 *addr) > static bool ice_vsi_fltr_changed(struct ice_vsi *vsi) > { > return test_bit(ICE_VSI_UMAC_FLTR_CHANGED, vsi->state) || > - test_bit(ICE_VSI_MMAC_FLTR_CHANGED, vsi->state) || > - test_bit(ICE_VSI_VLAN_FLTR_CHANGED, vsi->state); > + test_bit(ICE_VSI_MMAC_FLTR_CHANGED, vsi->state); > } > > /** > @@ -244,10 +243,15 @@ static int ice_set_promisc(struct ice_vsi *vsi, u8 promisc_m) > if (vsi->type != ICE_VSI_PF) > return 0; > > - if (vsi->num_vlan > 1) > - status = ice_fltr_set_vlan_vsi_promisc(&vsi->back->hw, vsi, promisc_m); > - else > - status = ice_fltr_set_vsi_promisc(&vsi->back->hw, vsi->idx, promisc_m, 0); > + if (vsi->num_vlan > 1) { > + promisc_m |= (ICE_PROMISC_VLAN_RX | ICE_PROMISC_VLAN_TX); > + status = ice_fltr_set_vlan_vsi_promisc(&vsi->back->hw, vsi, > + promisc_m); > + } else { > + status = ice_fltr_set_vsi_promisc(&vsi->back->hw, vsi->idx, > + promisc_m, 0); > + } > + > return status; > } > > @@ -264,10 +268,15 @@ static int ice_clear_promisc(struct ice_vsi *vsi, u8 promisc_m) > if (vsi->type != ICE_VSI_PF) > return 0; > > - if (vsi->num_vlan > 1) > - status = ice_fltr_clear_vlan_vsi_promisc(&vsi->back->hw, vsi, promisc_m); > - else > - status = ice_fltr_clear_vsi_promisc(&vsi->back->hw, vsi->idx, promisc_m, 0); > + if (vsi->num_vlan > 1) { > + promisc_m |= (ICE_PROMISC_VLAN_RX | ICE_PROMISC_VLAN_TX); > + status = ice_fltr_clear_vlan_vsi_promisc(&vsi->back->hw, vsi, > + promisc_m); > + } else { > + status = ice_fltr_clear_vsi_promisc(&vsi->back->hw, vsi->idx, > + promisc_m, 0); > + } > + > return status; > } > > @@ -285,7 +294,6 @@ static int ice_vsi_sync_fltr(struct ice_vsi *vsi) > struct ice_pf *pf = vsi->back; > struct ice_hw *hw = &pf->hw; > u32 changed_flags = 0; > - u8 promisc_m; > int err; > > if (!vsi->netdev) > @@ -303,7 +311,6 @@ static int ice_vsi_sync_fltr(struct ice_vsi *vsi) > if (ice_vsi_fltr_changed(vsi)) { > clear_bit(ICE_VSI_UMAC_FLTR_CHANGED, vsi->state); > clear_bit(ICE_VSI_MMAC_FLTR_CHANGED, vsi->state); > - clear_bit(ICE_VSI_VLAN_FLTR_CHANGED, vsi->state); > > /* grab the netdev's addr_list_lock */ > netif_addr_lock_bh(netdev); > @@ -352,29 +359,15 @@ static int ice_vsi_sync_fltr(struct ice_vsi *vsi) > /* check for changes in promiscuous modes */ > if (changed_flags & IFF_ALLMULTI) { > if (vsi->current_netdev_flags & IFF_ALLMULTI) { > - if (vsi->num_vlan > 1) > - promisc_m = ICE_MCAST_VLAN_PROMISC_BITS; > - else > - promisc_m = ICE_MCAST_PROMISC_BITS; Because `ice_{set,clear}_promisc()` are now always called with the same second argument (ICE_MCAST_PROMISC_BITS), wouldn't it be better to remove the arg and instead call `ice_fltr_{clear,set}_{vlan,vsi}_vsi_promisc()` with either ICE_MCAST_VLAN_PROMISC_BITS or ICE_MCAST_PROMISC_BITS inside the function? > - > - err = ice_set_promisc(vsi, promisc_m); > + err = ice_set_promisc(vsi, ICE_MCAST_PROMISC_BITS);> if (err) { > - netdev_err(netdev, "Error setting Multicast promiscuous mode on VSI %i\n", > - vsi->vsi_num); > vsi->current_netdev_flags &= ~IFF_ALLMULTI; > goto out_promisc; > } > } else { > /* !(vsi->current_netdev_flags & IFF_ALLMULTI) */ > - if (vsi->num_vlan > 1) > - promisc_m = ICE_MCAST_VLAN_PROMISC_BITS; > - else > - promisc_m = ICE_MCAST_PROMISC_BITS; > - > - err = ice_clear_promisc(vsi, promisc_m); > + err = ice_clear_promisc(vsi, ICE_MCAST_PROMISC_BITS); > if (err) { > - netdev_err(netdev, "Error clearing Multicast promiscuous mode on VSI %i\n", > - vsi->vsi_num); > vsi->current_netdev_flags |= IFF_ALLMULTI; > goto out_promisc; > } > @@ -3445,19 +3438,47 @@ ice_vlan_rx_add_vid(struct net_device *netdev, __always_unused __be16 proto, > if (!vid) > return 0; > > + while (test_and_set_bit(ICE_CFG_BUSY, vsi->state)) > + usleep_range(1000, 2000); > + > /* Enable VLAN pruning when a VLAN other than 0 is added */ > if (!ice_vsi_is_vlan_pruning_ena(vsi)) { > ret = ice_cfg_vlan_pruning(vsi, true); > if (ret) > - return ret; > + goto finish; > + } > + > + /* Add multicast promisc rule for the VLAN ID to be added if > + * all-multicast is currently enabled. > + */ > + if (vsi->current_netdev_flags & IFF_ALLMULTI) { > + ret = ice_fltr_set_vsi_promisc(&vsi->back->hw, vsi->idx, > + ICE_MCAST_VLAN_PROMISC_BITS, > + vid); > + if (ret) > + goto finish; > } > > /* Add a switch rule for this VLAN ID so its corresponding VLAN tagged > * packets aren't pruned by the device's internal switch on Rx > */ > ret = ice_vsi_add_vlan(vsi, vid, ICE_FWD_TO_VSI); > - if (!ret) > - set_bit(ICE_VSI_VLAN_FLTR_CHANGED, vsi->state); > + if (ret) > + goto finish; > + > + /* If all-multicast is currently enabled and this VLAN ID is only one > + * besides VLAN-0 we have to update look-up type of multicast promisc > + * rule for VLAN-0 from ICE_SW_LKUP_PROMISC to ICE_SW_LKUP_PROMISC_VLAN. > + */ > + if ((vsi->current_netdev_flags & IFF_ALLMULTI) && vsi->num_vlan == 2) { > + ice_fltr_clear_vsi_promisc(&vsi->back->hw, vsi->idx, > + ICE_MCAST_PROMISC_BITS, 0); > + ice_fltr_set_vsi_promisc(&vsi->back->hw, vsi->idx, > + ICE_MCAST_VLAN_PROMISC_BITS, 0); > + } > + > +finish: > + clear_bit(ICE_CFG_BUSY, vsi->state); > > return ret; > } > @@ -3482,18 +3503,44 @@ ice_vlan_rx_kill_vid(struct net_device *netdev, __always_unused __be16 proto, > if (!vid) > return 0; > > + while (test_and_set_bit(ICE_CFG_BUSY, vsi->state)) > + usleep_range(1000, 2000); > + > /* Make sure ice_vsi_kill_vlan is successful before updating VLAN > * information > */ > ret = ice_vsi_kill_vlan(vsi, vid); > if (ret) > - return ret; > + goto finish; > > - /* Disable pruning when VLAN 0 is the only VLAN rule */ > - if (vsi->num_vlan == 1 && ice_vsi_is_vlan_pruning_ena(vsi)) > - ret = ice_cfg_vlan_pruning(vsi, false); > + /* Remove multicast promisc rule for the removed VLAN ID if > + * all-multicast is enabled. > + */ > + if (vsi->current_netdev_flags & IFF_ALLMULTI) > + ice_fltr_clear_vsi_promisc(&vsi->back->hw, vsi->idx, > + ICE_MCAST_VLAN_PROMISC_BITS, vid); > + > + if (vsi->num_vlan == 1) { > + /* Disable pruning when VLAN 0 is the only VLAN rule */ > + if (ice_vsi_is_vlan_pruning_ena(vsi)) > + ice_cfg_vlan_pruning(vsi, false); Why was `ret = ...` removed here? > + > + /* Update look-up type of multicast promisc rule for VLAN 0 > + * from ICE_SW_LKUP_PROMISC_VLAN to ICE_SW_LKUP_PROMISC when > + * all-multicast is enabled and VLAN 0 is the only VLAN rule. > + */ > + if (vsi->current_netdev_flags & IFF_ALLMULTI) { > + ice_fltr_clear_vsi_promisc(&vsi->back->hw, vsi->idx, > + ICE_MCAST_VLAN_PROMISC_BITS, > + 0); > + ice_fltr_set_vsi_promisc(&vsi->back->hw, vsi->idx, > + ICE_MCAST_PROMISC_BITS, 0); > + } > + } > + > +finish: > + clear_bit(ICE_CFG_BUSY, vsi->state); > > - set_bit(ICE_VSI_VLAN_FLTR_CHANGED, vsi->state); > return ret; > } > Otherwise LGTM (though my experience in this area is rather limited). Marcin
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