[PATCH net] net: aquantia: fix vlans not working over bridged network

[Igor Russkikh <Igor.Russkikh@aquantia.com>]

From: Dmitry Bogdanov <dmitry.bogdanov@aquantia.com>

In configuration of vlan over bridge over aquantia device
it was found that vlan tagged traffic is dropped on chip.

The reason is that bridge device enables promisc mode,
but in atlantic chip vlan filters will still apply.
So we have to corellate promisc settings with vlan configuration.

The solution is to track in a separate state variable the
need of vlan forced promisc. And also consider generic
promisc configuration when doing vlan filter config.

Fixes: 7975d2aff5af ("net: aquantia: add support of rx-vlan-filter offload")
Signed-off-by: Dmitry Bogdanov <dmitry.bogdanov@aquantia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
---
 .../ethernet/aquantia/atlantic/aq_filters.c   | 10 ++++++++--
 .../net/ethernet/aquantia/atlantic/aq_nic.c   |  1 +
 .../net/ethernet/aquantia/atlantic/aq_nic.h   |  1 +
 .../aquantia/atlantic/hw_atl/hw_atl_b0.c      | 19 +++++++++++++------
 4 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_filters.c b/drivers/net/ethernet/aquantia/atlantic/aq_filters.c
index 18bc035da850..1fff462a4175 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_filters.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_filters.c
@@ -843,9 +843,14 @@ int aq_filters_vlans_update(struct aq_nic_s *aq_nic)
 		return err;
 
 	if (aq_nic->ndev->features & NETIF_F_HW_VLAN_CTAG_FILTER) {
-		if (hweight < AQ_VLAN_MAX_FILTERS)
-			err = aq_hw_ops->hw_filter_vlan_ctrl(aq_hw, true);
+		if (hweight < AQ_VLAN_MAX_FILTERS && hweight > 0) {
+			err = aq_hw_ops->hw_filter_vlan_ctrl(aq_hw,
+				!(aq_nic->packet_filter & IFF_PROMISC));
+			aq_nic->aq_nic_cfg.is_vlan_force_promisc = false;
+		} else {
 		/* otherwise left in promiscue mode */
+			aq_nic->aq_nic_cfg.is_vlan_force_promisc = true;
+		}
 	}
 
 	return err;
@@ -866,6 +871,7 @@ int aq_filters_vlan_offload_off(struct aq_nic_s *aq_nic)
 	if (unlikely(!aq_hw_ops->hw_filter_vlan_ctrl))
 		return -EOPNOTSUPP;
 
+	aq_nic->aq_nic_cfg.is_vlan_force_promisc = true;
 	err = aq_hw_ops->hw_filter_vlan_ctrl(aq_hw, false);
 	if (err)
 		return err;
diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
index 0da5e161ec5d..41172fbebddd 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
@@ -126,6 +126,7 @@ void aq_nic_cfg_start(struct aq_nic_s *self)
 
 	cfg->link_speed_msk &= cfg->aq_hw_caps->link_speed_msk;
 	cfg->features = cfg->aq_hw_caps->hw_features;
+	cfg->is_vlan_force_promisc = true;
 }
 
 static int aq_nic_update_link_status(struct aq_nic_s *self)
diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_nic.h b/drivers/net/ethernet/aquantia/atlantic/aq_nic.h
index eb2e3c7c36f9..0f22f5d5691b 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_nic.h
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_nic.h
@@ -35,6 +35,7 @@ struct aq_nic_cfg_s {
 	u32 flow_control;
 	u32 link_speed_msk;
 	u32 wol;
+	bool is_vlan_force_promisc;
 	u16 is_mc_list_enabled;
 	u16 mc_list_count;
 	bool is_autoneg;
diff --git a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c
index 1c7593d54035..13ac2661a473 100644
--- a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c
+++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c
@@ -778,8 +778,15 @@ static int hw_atl_b0_hw_packet_filter_set(struct aq_hw_s *self,
 					  unsigned int packet_filter)
 {
 	unsigned int i = 0U;
+	struct aq_nic_cfg_s *cfg = self->aq_nic_cfg;
+
+	hw_atl_rpfl2promiscuous_mode_en_set(self,
+					    IS_FILTER_ENABLED(IFF_PROMISC));
+
+	hw_atl_rpf_vlan_prom_mode_en_set(self,
+				     IS_FILTER_ENABLED(IFF_PROMISC) ||
+				     cfg->is_vlan_force_promisc);
 
-	hw_atl_rpfl2promiscuous_mode_en_set(self, IS_FILTER_ENABLED(IFF_PROMISC));
 	hw_atl_rpfl2multicast_flr_en_set(self,
 					 IS_FILTER_ENABLED(IFF_ALLMULTI), 0);
 
@@ -788,13 +795,13 @@ static int hw_atl_b0_hw_packet_filter_set(struct aq_hw_s *self,
 
 	hw_atl_rpfl2broadcast_en_set(self, IS_FILTER_ENABLED(IFF_BROADCAST));
 
-	self->aq_nic_cfg->is_mc_list_enabled = IS_FILTER_ENABLED(IFF_MULTICAST);
+	cfg->is_mc_list_enabled = IS_FILTER_ENABLED(IFF_MULTICAST);
 
 	for (i = HW_ATL_B0_MAC_MIN; i < HW_ATL_B0_MAC_MAX; ++i)
 		hw_atl_rpfl2_uc_flr_en_set(self,
-					   (self->aq_nic_cfg->is_mc_list_enabled &&
-				    (i <= self->aq_nic_cfg->mc_list_count)) ?
-				    1U : 0U, i);
+					   (cfg->is_mc_list_enabled &&
+					    (i <= cfg->mc_list_count)) ?
+					   1U : 0U, i);
 
 	return aq_hw_err_from_flags(self);
 }
@@ -1086,7 +1093,7 @@ static int hw_atl_b0_hw_vlan_set(struct aq_hw_s *self,
 static int hw_atl_b0_hw_vlan_ctrl(struct aq_hw_s *self, bool enable)
 {
 	/* set promisc in case of disabing the vland filter */
-	hw_atl_rpf_vlan_prom_mode_en_set(self, !!!enable);
+	hw_atl_rpf_vlan_prom_mode_en_set(self, !enable);
 
 	return aq_hw_err_from_flags(self);
 }
-- 
2.17.1