[PATCH net v2 0/2][pull request] iavf: fix racing in VLANs

[PATCH net v2 0/2][pull request] iavf: fix racing in VLANs

[Tony Nguyen]

Ahmed Zaki says:

This patchset mainly fixes a racing issue in the iavf where the number of
VLANs in the vlan_filter_list might be more than the PF limit. To fix that,
we get rid of the cvlans and svlans bitmaps and keep all the required info 
in the list.

The second patch adds two new states that are needed so that we keep the 
VLAN info while the interface goes DOWN:
    -- DISABLE    (notify PF, but keep the filter in the list)
    -- INACTIVE   (dev is DOWN, filter is removed from PF)

Finally, the current code keeps each state in a separate bit field, which
is error prone. The first patch refactors that by replacing all bits with
a single enum. The changes are minimal where each bit change is replaced
with the new state value.
---
v2: change state names from __IAVF_VLAN_STATE to IAVF_STATE_NAME

The following are changes since commit b9881d9a761a7e078c394ff8e30e1659d74f898f:
  Merge branch 'bonding-ns-validation-fixes'
and are available in the git repository at:
  git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/net-queue 40GbE

Ahmed Zaki (2):
  iavf: refactor VLAN filter states
  iavf: remove active_cvlans and active_svlans bitmaps

 drivers/net/ethernet/intel/iavf/iavf.h        | 20 +++---
 drivers/net/ethernet/intel/iavf/iavf_main.c   | 44 +++++-------
 .../net/ethernet/intel/iavf/iavf_virtchnl.c   | 68 ++++++++++---------
 3 files changed, 66 insertions(+), 66 deletions(-)

-- 
2.38.1

[PATCH net v2 1/2] iavf: refactor VLAN filter states

[Tony Nguyen]

From: Ahmed Zaki <ahmed.zaki@intel.com>

The VLAN filter states are currently being saved as individual bits.
This is error prone as multiple bits might be mistakenly set.

Fix by replacing the bits with a single state enum. Also, add an
"ACTIVE" state for filters that are accepted by the PF.

Signed-off-by: Ahmed Zaki <ahmed.zaki@intel.com>
Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/iavf/iavf.h        | 15 +++++----
 drivers/net/ethernet/intel/iavf/iavf_main.c   |  8 ++---
 .../net/ethernet/intel/iavf/iavf_virtchnl.c   | 31 +++++++++----------
 3 files changed, 28 insertions(+), 26 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf.h b/drivers/net/ethernet/intel/iavf/iavf.h
index 232bc61d9eee..692d6a642118 100644
--- a/drivers/net/ethernet/intel/iavf/iavf.h
+++ b/drivers/net/ethernet/intel/iavf/iavf.h
@@ -158,15 +158,18 @@ struct iavf_vlan {
 	u16 tpid;
 };
 
+enum iavf_vlan_state_t {
+	IAVF_VLAN_INVALID,
+	IAVF_VLAN_ADD,		/* filter needs to be added */
+	IAVF_VLAN_IS_NEW,	/* filter is new, wait for PF answer */
+	IAVF_VLAN_ACTIVE,	/* filter is accepted by PF */
+	IAVF_VLAN_REMOVE,	/* filter needs to be removed */
+};
+
 struct iavf_vlan_filter {
 	struct list_head list;
 	struct iavf_vlan vlan;
-	struct {
-		u8 is_new_vlan:1;	/* filter is new, wait for PF answer */
-		u8 remove:1;		/* filter needs to be removed */
-		u8 add:1;		/* filter needs to be added */
-		u8 padding:5;
-	};
+	enum iavf_vlan_state_t state;
 };
 
 #define IAVF_MAX_TRAFFIC_CLASS	4
diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 095201e83c9d..fe9798e4b4ac 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -791,7 +791,7 @@ iavf_vlan_filter *iavf_add_vlan(struct iavf_adapter *adapter,
 		f->vlan = vlan;
 
 		list_add_tail(&f->list, &adapter->vlan_filter_list);
-		f->add = true;
+		f->state = IAVF_VLAN_ADD;
 		adapter->aq_required |= IAVF_FLAG_AQ_ADD_VLAN_FILTER;
 	}
 
@@ -813,7 +813,7 @@ static void iavf_del_vlan(struct iavf_adapter *adapter, struct iavf_vlan vlan)
 
 	f = iavf_find_vlan(adapter, vlan);
 	if (f) {
-		f->remove = true;
+		f->state = IAVF_VLAN_REMOVE;
 		adapter->aq_required |= IAVF_FLAG_AQ_DEL_VLAN_FILTER;
 	}
 
@@ -1296,11 +1296,11 @@ static void iavf_clear_mac_vlan_filters(struct iavf_adapter *adapter)
 	/* remove all VLAN filters */
 	list_for_each_entry_safe(vlf, vlftmp, &adapter->vlan_filter_list,
 				 list) {
-		if (vlf->add) {
+		if (vlf->state == IAVF_VLAN_ADD) {
 			list_del(&vlf->list);
 			kfree(vlf);
 		} else {
-			vlf->remove = true;
+			vlf->state = IAVF_VLAN_REMOVE;
 		}
 	}
 	spin_unlock_bh(&adapter->mac_vlan_list_lock);
diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
index 4e17d006c52d..5047b4c83718 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
@@ -642,7 +642,7 @@ static void iavf_vlan_add_reject(struct iavf_adapter *adapter)
 
 	spin_lock_bh(&adapter->mac_vlan_list_lock);
 	list_for_each_entry_safe(f, ftmp, &adapter->vlan_filter_list, list) {
-		if (f->is_new_vlan) {
+		if (f->state == IAVF_VLAN_IS_NEW) {
 			if (f->vlan.tpid == ETH_P_8021Q)
 				clear_bit(f->vlan.vid,
 					  adapter->vsi.active_cvlans);
@@ -679,7 +679,7 @@ void iavf_add_vlans(struct iavf_adapter *adapter)
 	spin_lock_bh(&adapter->mac_vlan_list_lock);
 
 	list_for_each_entry(f, &adapter->vlan_filter_list, list) {
-		if (f->add)
+		if (f->state == IAVF_VLAN_ADD)
 			count++;
 	}
 	if (!count || !VLAN_FILTERING_ALLOWED(adapter)) {
@@ -710,11 +710,10 @@ void iavf_add_vlans(struct iavf_adapter *adapter)
 		vvfl->vsi_id = adapter->vsi_res->vsi_id;
 		vvfl->num_elements = count;
 		list_for_each_entry(f, &adapter->vlan_filter_list, list) {
-			if (f->add) {
+			if (f->state == IAVF_VLAN_ADD) {
 				vvfl->vlan_id[i] = f->vlan.vid;
 				i++;
-				f->add = false;
-				f->is_new_vlan = true;
+				f->state = IAVF_VLAN_IS_NEW;
 				if (i == count)
 					break;
 			}
@@ -760,7 +759,7 @@ void iavf_add_vlans(struct iavf_adapter *adapter)
 		vvfl_v2->vport_id = adapter->vsi_res->vsi_id;
 		vvfl_v2->num_elements = count;
 		list_for_each_entry(f, &adapter->vlan_filter_list, list) {
-			if (f->add) {
+			if (f->state == IAVF_VLAN_ADD) {
 				struct virtchnl_vlan_supported_caps *filtering_support =
 					&adapter->vlan_v2_caps.filtering.filtering_support;
 				struct virtchnl_vlan *vlan;
@@ -778,8 +777,7 @@ void iavf_add_vlans(struct iavf_adapter *adapter)
 				vlan->tpid = f->vlan.tpid;
 
 				i++;
-				f->add = false;
-				f->is_new_vlan = true;
+				f->state = IAVF_VLAN_IS_NEW;
 			}
 		}
 
@@ -822,10 +820,11 @@ void iavf_del_vlans(struct iavf_adapter *adapter)
 		 * filters marked for removal to enable bailing out before
 		 * sending a virtchnl message
 		 */
-		if (f->remove && !VLAN_FILTERING_ALLOWED(adapter)) {
+		if (f->state == IAVF_VLAN_REMOVE &&
+		    !VLAN_FILTERING_ALLOWED(adapter)) {
 			list_del(&f->list);
 			kfree(f);
-		} else if (f->remove) {
+		} else if (f->state == IAVF_VLAN_REMOVE) {
 			count++;
 		}
 	}
@@ -857,7 +856,7 @@ void iavf_del_vlans(struct iavf_adapter *adapter)
 		vvfl->vsi_id = adapter->vsi_res->vsi_id;
 		vvfl->num_elements = count;
 		list_for_each_entry_safe(f, ftmp, &adapter->vlan_filter_list, list) {
-			if (f->remove) {
+			if (f->state == IAVF_VLAN_REMOVE) {
 				vvfl->vlan_id[i] = f->vlan.vid;
 				i++;
 				list_del(&f->list);
@@ -901,7 +900,7 @@ void iavf_del_vlans(struct iavf_adapter *adapter)
 		vvfl_v2->vport_id = adapter->vsi_res->vsi_id;
 		vvfl_v2->num_elements = count;
 		list_for_each_entry_safe(f, ftmp, &adapter->vlan_filter_list, list) {
-			if (f->remove) {
+			if (f->state == IAVF_VLAN_REMOVE) {
 				struct virtchnl_vlan_supported_caps *filtering_support =
 					&adapter->vlan_v2_caps.filtering.filtering_support;
 				struct virtchnl_vlan *vlan;
@@ -2192,7 +2191,7 @@ void iavf_virtchnl_completion(struct iavf_adapter *adapter,
 				list_for_each_entry(vlf,
 						    &adapter->vlan_filter_list,
 						    list)
-					vlf->add = true;
+					vlf->state = IAVF_VLAN_ADD;
 
 				adapter->aq_required |=
 					IAVF_FLAG_AQ_ADD_VLAN_FILTER;
@@ -2260,7 +2259,7 @@ void iavf_virtchnl_completion(struct iavf_adapter *adapter,
 				list_for_each_entry(vlf,
 						    &adapter->vlan_filter_list,
 						    list)
-					vlf->add = true;
+					vlf->state = IAVF_VLAN_ADD;
 
 				aq_required |= IAVF_FLAG_AQ_ADD_VLAN_FILTER;
 			}
@@ -2444,8 +2443,8 @@ void iavf_virtchnl_completion(struct iavf_adapter *adapter,
 
 		spin_lock_bh(&adapter->mac_vlan_list_lock);
 		list_for_each_entry(f, &adapter->vlan_filter_list, list) {
-			if (f->is_new_vlan) {
-				f->is_new_vlan = false;
+			if (f->state == IAVF_VLAN_IS_NEW) {
+				f->state = IAVF_VLAN_ACTIVE;
 				if (f->vlan.tpid == ETH_P_8021Q)
 					set_bit(f->vlan.vid,
 						adapter->vsi.active_cvlans);
-- 
2.38.1

[PATCH net v2 2/2] iavf: remove active_cvlans and active_svlans bitmaps

[Tony Nguyen]

From: Ahmed Zaki <ahmed.zaki@intel.com>

The VLAN filters info is currently being held in a list and 2 bitmaps
(active_cvlans and active_svlans). We are experiencing some racing where
data is not in sync in the list and bitmaps. For example, the VLAN is
initially added to the list but only when the PF replies, it is added to
the bitmap. If a user adds many V2 VLANS before the PF responds:

    while [ $((i++)) ]
        ip l add l eth0 name eth0.$i type vlan id $i

we might end up with more VLAN list entries than the designated limit.
Also, The "ip link show" will show more links added than the PF limit.

On the other and, the bitmaps are only used to check the number of VLAN
filters and to re-enable the filters when the interface goes from DOWN to
UP.

This patch gets rid of the bitmaps and uses the list only. To do that,
the states of the VLAN filter are modified:
1 - IAVF_VLAN_REMOVE: the entry needs to be totally removed after informing
  the PF. This is the "ip link del eth0.$i" path.
2 - IAVF_VLAN_DISABLE: (new) the netdev went down. The filter needs to be
  removed from the PF and then marked INACTIVE.
3 - IAVF_VLAN_INACTIVE: (new) no PF filter exists, but the user did not
  delete the VLAN.

Fixes: 48ccc43ecf10 ("iavf: Add support VIRTCHNL_VF_OFFLOAD_VLAN_V2 during netdev config")
Signed-off-by: Ahmed Zaki <ahmed.zaki@intel.com>
Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/iavf/iavf.h        |  7 +--
 drivers/net/ethernet/intel/iavf/iavf_main.c   | 40 +++++++----------
 .../net/ethernet/intel/iavf/iavf_virtchnl.c   | 45 ++++++++++---------
 3 files changed, 45 insertions(+), 47 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf.h b/drivers/net/ethernet/intel/iavf/iavf.h
index 692d6a642118..746ff76f2fb1 100644
--- a/drivers/net/ethernet/intel/iavf/iavf.h
+++ b/drivers/net/ethernet/intel/iavf/iavf.h
@@ -59,8 +59,6 @@ enum iavf_vsi_state_t {
 struct iavf_vsi {
 	struct iavf_adapter *back;
 	struct net_device *netdev;
-	unsigned long active_cvlans[BITS_TO_LONGS(VLAN_N_VID)];
-	unsigned long active_svlans[BITS_TO_LONGS(VLAN_N_VID)];
 	u16 seid;
 	u16 id;
 	DECLARE_BITMAP(state, __IAVF_VSI_STATE_SIZE__);
@@ -163,7 +161,9 @@ enum iavf_vlan_state_t {
 	IAVF_VLAN_ADD,		/* filter needs to be added */
 	IAVF_VLAN_IS_NEW,	/* filter is new, wait for PF answer */
 	IAVF_VLAN_ACTIVE,	/* filter is accepted by PF */
-	IAVF_VLAN_REMOVE,	/* filter needs to be removed */
+	IAVF_VLAN_DISABLE,	/* filter needs to be deleted by PF, then marked INACTIVE */
+	IAVF_VLAN_INACTIVE,	/* filter is inactive, we are in IFF_DOWN */
+	IAVF_VLAN_REMOVE,	/* filter needs to be removed from list */
 };
 
 struct iavf_vlan_filter {
@@ -261,6 +261,7 @@ struct iavf_adapter {
 	wait_queue_head_t vc_waitqueue;
 	struct iavf_q_vector *q_vectors;
 	struct list_head vlan_filter_list;
+	int num_vlan_filters;
 	struct list_head mac_filter_list;
 	struct mutex crit_lock;
 	struct mutex client_lock;
diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index fe9798e4b4ac..2de4baff4c20 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -792,6 +792,7 @@ iavf_vlan_filter *iavf_add_vlan(struct iavf_adapter *adapter,
 
 		list_add_tail(&f->list, &adapter->vlan_filter_list);
 		f->state = IAVF_VLAN_ADD;
+		adapter->num_vlan_filters++;
 		adapter->aq_required |= IAVF_FLAG_AQ_ADD_VLAN_FILTER;
 	}
 
@@ -828,14 +829,18 @@ static void iavf_del_vlan(struct iavf_adapter *adapter, struct iavf_vlan vlan)
  **/
 static void iavf_restore_filters(struct iavf_adapter *adapter)
 {
-	u16 vid;
+	struct iavf_vlan_filter *f;
 
 	/* re-add all VLAN filters */
-	for_each_set_bit(vid, adapter->vsi.active_cvlans, VLAN_N_VID)
-		iavf_add_vlan(adapter, IAVF_VLAN(vid, ETH_P_8021Q));
+	spin_lock_bh(&adapter->mac_vlan_list_lock);
 
-	for_each_set_bit(vid, adapter->vsi.active_svlans, VLAN_N_VID)
-		iavf_add_vlan(adapter, IAVF_VLAN(vid, ETH_P_8021AD));
+	list_for_each_entry(f, &adapter->vlan_filter_list, list) {
+		if (f->state == IAVF_VLAN_INACTIVE)
+			f->state = IAVF_VLAN_ADD;
+	}
+
+	spin_unlock_bh(&adapter->mac_vlan_list_lock);
+	adapter->aq_required |= IAVF_FLAG_AQ_ADD_VLAN_FILTER;
 }
 
 /**
@@ -844,8 +849,7 @@ static void iavf_restore_filters(struct iavf_adapter *adapter)
  */
 u16 iavf_get_num_vlans_added(struct iavf_adapter *adapter)
 {
-	return bitmap_weight(adapter->vsi.active_cvlans, VLAN_N_VID) +
-		bitmap_weight(adapter->vsi.active_svlans, VLAN_N_VID);
+	return adapter->num_vlan_filters;
 }
 
 /**
@@ -928,11 +932,6 @@ static int iavf_vlan_rx_kill_vid(struct net_device *netdev,
 		return 0;
 
 	iavf_del_vlan(adapter, IAVF_VLAN(vid, be16_to_cpu(proto)));
-	if (proto == cpu_to_be16(ETH_P_8021Q))
-		clear_bit(vid, adapter->vsi.active_cvlans);
-	else
-		clear_bit(vid, adapter->vsi.active_svlans);
-
 	return 0;
 }
 
@@ -1293,16 +1292,11 @@ static void iavf_clear_mac_vlan_filters(struct iavf_adapter *adapter)
 		}
 	}
 
-	/* remove all VLAN filters */
+	/* disable all VLAN filters */
 	list_for_each_entry_safe(vlf, vlftmp, &adapter->vlan_filter_list,
-				 list) {
-		if (vlf->state == IAVF_VLAN_ADD) {
-			list_del(&vlf->list);
-			kfree(vlf);
-		} else {
-			vlf->state = IAVF_VLAN_REMOVE;
-		}
-	}
+				 list)
+		vlf->state = IAVF_VLAN_DISABLE;
+
 	spin_unlock_bh(&adapter->mac_vlan_list_lock);
 }
 
@@ -2914,6 +2908,7 @@ static void iavf_disable_vf(struct iavf_adapter *adapter)
 		list_del(&fv->list);
 		kfree(fv);
 	}
+	adapter->num_vlan_filters = 0;
 
 	spin_unlock_bh(&adapter->mac_vlan_list_lock);
 
@@ -3131,9 +3126,6 @@ static void iavf_reset_task(struct work_struct *work)
 	adapter->aq_required |= IAVF_FLAG_AQ_ADD_CLOUD_FILTER;
 	iavf_misc_irq_enable(adapter);
 
-	bitmap_clear(adapter->vsi.active_cvlans, 0, VLAN_N_VID);
-	bitmap_clear(adapter->vsi.active_svlans, 0, VLAN_N_VID);
-
 	mod_delayed_work(adapter->wq, &adapter->watchdog_task, 2);
 
 	/* We were running when the reset started, so we need to restore some
diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
index 5047b4c83718..9afbbdac3590 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
@@ -643,15 +643,9 @@ static void iavf_vlan_add_reject(struct iavf_adapter *adapter)
 	spin_lock_bh(&adapter->mac_vlan_list_lock);
 	list_for_each_entry_safe(f, ftmp, &adapter->vlan_filter_list, list) {
 		if (f->state == IAVF_VLAN_IS_NEW) {
-			if (f->vlan.tpid == ETH_P_8021Q)
-				clear_bit(f->vlan.vid,
-					  adapter->vsi.active_cvlans);
-			else
-				clear_bit(f->vlan.vid,
-					  adapter->vsi.active_svlans);
-
 			list_del(&f->list);
 			kfree(f);
+			adapter->num_vlan_filters--;
 		}
 	}
 	spin_unlock_bh(&adapter->mac_vlan_list_lock);
@@ -824,7 +818,12 @@ void iavf_del_vlans(struct iavf_adapter *adapter)
 		    !VLAN_FILTERING_ALLOWED(adapter)) {
 			list_del(&f->list);
 			kfree(f);
-		} else if (f->state == IAVF_VLAN_REMOVE) {
+			adapter->num_vlan_filters--;
+		} else if (f->state == IAVF_VLAN_DISABLE &&
+		    !VLAN_FILTERING_ALLOWED(adapter)) {
+			f->state = IAVF_VLAN_INACTIVE;
+		} else if (f->state == IAVF_VLAN_REMOVE ||
+			   f->state == IAVF_VLAN_DISABLE) {
 			count++;
 		}
 	}
@@ -856,11 +855,18 @@ void iavf_del_vlans(struct iavf_adapter *adapter)
 		vvfl->vsi_id = adapter->vsi_res->vsi_id;
 		vvfl->num_elements = count;
 		list_for_each_entry_safe(f, ftmp, &adapter->vlan_filter_list, list) {
-			if (f->state == IAVF_VLAN_REMOVE) {
+			if (f->state == IAVF_VLAN_DISABLE) {
 				vvfl->vlan_id[i] = f->vlan.vid;
+				f->state = IAVF_VLAN_INACTIVE;
 				i++;
+				if (i == count)
+					break;
+			} else if (f->state == IAVF_VLAN_REMOVE) {
+				vvfl->vlan_id[i] = f->vlan.vid;
 				list_del(&f->list);
 				kfree(f);
+				adapter->num_vlan_filters--;
+				i++;
 				if (i == count)
 					break;
 			}
@@ -900,7 +906,8 @@ void iavf_del_vlans(struct iavf_adapter *adapter)
 		vvfl_v2->vport_id = adapter->vsi_res->vsi_id;
 		vvfl_v2->num_elements = count;
 		list_for_each_entry_safe(f, ftmp, &adapter->vlan_filter_list, list) {
-			if (f->state == IAVF_VLAN_REMOVE) {
+			if (f->state == IAVF_VLAN_DISABLE ||
+			    f->state == IAVF_VLAN_REMOVE) {
 				struct virtchnl_vlan_supported_caps *filtering_support =
 					&adapter->vlan_v2_caps.filtering.filtering_support;
 				struct virtchnl_vlan *vlan;
@@ -914,8 +921,13 @@ void iavf_del_vlans(struct iavf_adapter *adapter)
 				vlan->tci = f->vlan.vid;
 				vlan->tpid = f->vlan.tpid;
 
-				list_del(&f->list);
-				kfree(f);
+				if (f->state == IAVF_VLAN_DISABLE) {
+					f->state = IAVF_VLAN_INACTIVE;
+				} else {
+					list_del(&f->list);
+					kfree(f);
+					adapter->num_vlan_filters--;
+				}
 				i++;
 				if (i == count)
 					break;
@@ -2443,15 +2455,8 @@ void iavf_virtchnl_completion(struct iavf_adapter *adapter,
 
 		spin_lock_bh(&adapter->mac_vlan_list_lock);
 		list_for_each_entry(f, &adapter->vlan_filter_list, list) {
-			if (f->state == IAVF_VLAN_IS_NEW) {
+			if (f->state == IAVF_VLAN_IS_NEW)
 				f->state = IAVF_VLAN_ACTIVE;
-				if (f->vlan.tpid == ETH_P_8021Q)
-					set_bit(f->vlan.vid,
-						adapter->vsi.active_cvlans);
-				else
-					set_bit(f->vlan.vid,
-						adapter->vsi.active_svlans);
-			}
 		}
 		spin_unlock_bh(&adapter->mac_vlan_list_lock);
 		}
-- 
2.38.1

Re: [PATCH net v2 1/2] iavf: refactor VLAN filter states

[Leon Romanovsky]

On Fri, Apr 07, 2023 at 02:07:29PM -0700, Tony Nguyen wrote:
> From: Ahmed Zaki <ahmed.zaki@intel.com>
> 
> The VLAN filter states are currently being saved as individual bits.
> This is error prone as multiple bits might be mistakenly set.
> 
> Fix by replacing the bits with a single state enum. Also, add an
> "ACTIVE" state for filters that are accepted by the PF.
> 
> Signed-off-by: Ahmed Zaki <ahmed.zaki@intel.com>
> Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
> ---
>  drivers/net/ethernet/intel/iavf/iavf.h        | 15 +++++----
>  drivers/net/ethernet/intel/iavf/iavf_main.c   |  8 ++---
>  .../net/ethernet/intel/iavf/iavf_virtchnl.c   | 31 +++++++++----------
>  3 files changed, 28 insertions(+), 26 deletions(-)
> 

Thanks,
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>

Re: [PATCH net v2 2/2] iavf: remove active_cvlans and active_svlans bitmaps

[Leon Romanovsky]

On Fri, Apr 07, 2023 at 02:07:30PM -0700, Tony Nguyen wrote:
> From: Ahmed Zaki <ahmed.zaki@intel.com>
> 
> The VLAN filters info is currently being held in a list and 2 bitmaps
> (active_cvlans and active_svlans). We are experiencing some racing where
> data is not in sync in the list and bitmaps. For example, the VLAN is
> initially added to the list but only when the PF replies, it is added to
> the bitmap. If a user adds many V2 VLANS before the PF responds:
> 
>     while [ $((i++)) ]
>         ip l add l eth0 name eth0.$i type vlan id $i
> 
> we might end up with more VLAN list entries than the designated limit.
> Also, The "ip link show" will show more links added than the PF limit.
> 
> On the other and, the bitmaps are only used to check the number of VLAN
> filters and to re-enable the filters when the interface goes from DOWN to
> UP.
> 
> This patch gets rid of the bitmaps and uses the list only. To do that,
> the states of the VLAN filter are modified:
> 1 - IAVF_VLAN_REMOVE: the entry needs to be totally removed after informing
>   the PF. This is the "ip link del eth0.$i" path.
> 2 - IAVF_VLAN_DISABLE: (new) the netdev went down. The filter needs to be
>   removed from the PF and then marked INACTIVE.
> 3 - IAVF_VLAN_INACTIVE: (new) no PF filter exists, but the user did not
>   delete the VLAN.
> 
> Fixes: 48ccc43ecf10 ("iavf: Add support VIRTCHNL_VF_OFFLOAD_VLAN_V2 during netdev config")
> Signed-off-by: Ahmed Zaki <ahmed.zaki@intel.com>
> Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
> ---
>  drivers/net/ethernet/intel/iavf/iavf.h        |  7 +--
>  drivers/net/ethernet/intel/iavf/iavf_main.c   | 40 +++++++----------
>  .../net/ethernet/intel/iavf/iavf_virtchnl.c   | 45 ++++++++++---------
>  3 files changed, 45 insertions(+), 47 deletions(-)
> 

Thanks,
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>

Re: [PATCH net v2 0/2][pull request] iavf: fix racing in VLANs

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net.git (main)
by Tony Nguyen <anthony.l.nguyen@intel.com>:

On Fri,  7 Apr 2023 14:07:28 -0700 you wrote:
> Ahmed Zaki says:
> 
> This patchset mainly fixes a racing issue in the iavf where the number of
> VLANs in the vlan_filter_list might be more than the PF limit. To fix that,
> we get rid of the cvlans and svlans bitmaps and keep all the required info
> in the list.
> 
> [...]

Here is the summary with links:
  - [net,v2,1/2] iavf: refactor VLAN filter states
    https://git.kernel.org/netdev/net/c/0c0da0e95105
  - [net,v2,2/2] iavf: remove active_cvlans and active_svlans bitmaps
    https://git.kernel.org/netdev/net/c/9c85b7fa12ef

You are awesome, thank you!
-- 
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