i40e: set broadcast promiscuous mode for each active VLAN

A previous workaround added to ensure receipt of all broadcast frames
incorrectly set the broadcast promiscuous mode unconditionally
regardless of active VLAN status.

Replace this partial workaround with a complete solution that sets the
broadcast promiscuous filters in i40e_sync_vsi_filters. This new method
sets the promiscuous mode based on when broadcast filters are added or
removed.

I40E_VLAN_ANY will request a broadcast filter for all VLANs, (as we're
in untagged mode) while a broadcast filter on a specific VLAN will only
request broadcast for that VLAN.

Thus, we restore addition of broadcast filter to the array, but we add
special handling for these such that they enable the broadcast
promiscuous mode instead of being sent as regular filters.

The end result is that we will correctly receive all broadcast packets
(even those with a *source* address equal to the broadcast address) but
will not receive packets for which we don't have an active VLAN filter.

Change-ID: I7d0585c5cec1a5bf55bf533b42e5e817d5db6a2d
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 85 insertions, 21 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 17dde85184033..594856d605ecc 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -1245,13 +1245,6 @@ struct i40e_mac_filter *i40e_add_filter(struct i40e_vsi *vsi,
 	if (!vsi || !macaddr)
 		return NULL;
 
-	/* Do not allow broadcast filter to be added since broadcast filter
-	 * is added as part of add VSI for any newly created VSI except
-	 * FDIR VSI
-	 */
-	if (is_broadcast_ether_addr(macaddr))
-		return NULL;
-
 	f = i40e_find_filter(vsi, macaddr, vlan);
 	if (!f) {
 		f = kzalloc(sizeof(*f), GFP_ATOMIC);
@@ -1857,6 +1850,47 @@ void i40e_aqc_add_filters(struct i40e_vsi *vsi, const char *vsi_name,
 }
 
 /**
+ * i40e_aqc_broadcast_filter - Set promiscuous broadcast flags
+ * @vsi: pointer to the VSI
+ * @f: filter data
+ *
+ * This function sets or clears the promiscuous broadcast flags for VLAN
+ * filters in order to properly receive broadcast frames. Assumes that only
+ * broadcast filters are passed.
+ **/
+static
+void i40e_aqc_broadcast_filter(struct i40e_vsi *vsi, const char *vsi_name,
+			       struct i40e_mac_filter *f)
+{
+	bool enable = f->state == I40E_FILTER_NEW;
+	struct i40e_hw *hw = &vsi->back->hw;
+	i40e_status aq_ret;
+
+	if (f->vlan == I40E_VLAN_ANY) {
+		aq_ret = i40e_aq_set_vsi_broadcast(hw,
+						   vsi->seid,
+						   enable,
+						   NULL);
+	} else {
+		aq_ret = i40e_aq_set_vsi_bc_promisc_on_vlan(hw,
+							    vsi->seid,
+							    enable,
+							    f->vlan,
+							    NULL);
+	}
+
+	if (aq_ret) {
+		dev_warn(&vsi->back->pdev->dev,
+			 "Error %s setting broadcast promiscuous mode on %s\n",
+			 i40e_aq_str(hw, hw->aq.asq_last_status),
+			 vsi_name);
+		f->state = I40E_FILTER_FAILED;
+	} else if (enable) {
+		f->state = I40E_FILTER_ACTIVE;
+	}
+}
+
+/**
  * i40e_sync_vsi_filters - Update the VSI filter list to the HW
  * @vsi: ptr to the VSI
  *
@@ -2004,6 +2038,17 @@ int i40e_sync_vsi_filters(struct i40e_vsi *vsi)
 		hlist_for_each_entry_safe(f, h, &tmp_del_list, hlist) {
 			cmd_flags = 0;
 
+			/* handle broadcast filters by updating the broadcast
+			 * promiscuous flag instead of deleting a MAC filter.
+			 */
+			if (is_broadcast_ether_addr(f->macaddr)) {
+				i40e_aqc_broadcast_filter(vsi, vsi_name, f);
+
+				hlist_del(&f->hlist);
+				kfree(f);
+				continue;
+			}
+
 			/* add to delete list */
 			ether_addr_copy(del_list[num_del].mac_addr, f->macaddr);
 			if (f->vlan == I40E_VLAN_ANY) {
@@ -2060,12 +2105,25 @@ int i40e_sync_vsi_filters(struct i40e_vsi *vsi)
 			goto err_no_memory;
 
 		num_add = 0;
-		hlist_for_each_entry(f, &tmp_add_list, hlist) {
+		hlist_for_each_entry_safe(f, h, &tmp_add_list, hlist) {
 			if (test_bit(__I40E_FILTER_OVERFLOW_PROMISC,
 				     &vsi->state)) {
 				f->state = I40E_FILTER_FAILED;
 				continue;
 			}
+
+			/* handle broadcast filters by updating the broadcast
+			 * promiscuous flag instead of adding a MAC filter.
+			 */
+			if (is_broadcast_ether_addr(f->macaddr)) {
+				u64 key = i40e_addr_to_hkey(f->macaddr);
+				i40e_aqc_broadcast_filter(vsi, vsi_name, f);
+
+				hlist_del(&f->hlist);
+				hash_add(vsi->mac_filter_hash, &f->hlist, key);
+				continue;
+			}
+
 			/* add to add array */
 			if (num_add == 0)
 				add_head = f;
@@ -9178,6 +9236,7 @@ static int i40e_config_netdev(struct i40e_vsi *vsi)
 	struct i40e_hw *hw = &pf->hw;
 	struct i40e_netdev_priv *np;
 	struct net_device *netdev;
+	u8 broadcast[ETH_ALEN];
 	u8 mac_addr[ETH_ALEN];
 	int etherdev_size;
 
@@ -9246,6 +9305,24 @@ static int i40e_config_netdev(struct i40e_vsi *vsi)
 		spin_unlock_bh(&vsi->mac_filter_hash_lock);
 	}
 
+	/* Add the broadcast filter so that we initially will receive
+	 * broadcast packets. Note that when a new VLAN is first added the
+	 * driver will convert all filters marked I40E_VLAN_ANY into VLAN
+	 * specific filters as part of transitioning into "vlan" operation.
+	 * When more VLANs are added, the driver will copy each existing MAC
+	 * filter and add it for the new VLAN.
+	 *
+	 * Broadcast filters are handled specially by
+	 * i40e_sync_filters_subtask, as the driver must to set the broadcast
+	 * promiscuous bit instead of adding this directly as a MAC/VLAN
+	 * filter. The subtask will update the correct broadcast promiscuous
+	 * bits as VLANs become active or inactive.
+	 */
+	eth_broadcast_addr(broadcast);
+	spin_lock_bh(&vsi->mac_filter_hash_lock);
+	i40e_add_filter(vsi, broadcast, I40E_VLAN_ANY);
+	spin_unlock_bh(&vsi->mac_filter_hash_lock);
+
 	ether_addr_copy(netdev->dev_addr, mac_addr);
 	ether_addr_copy(netdev->perm_addr, mac_addr);
 
@@ -9328,7 +9405,6 @@ int i40e_is_vsi_uplink_mode_veb(struct i40e_vsi *vsi)
 static int i40e_add_vsi(struct i40e_vsi *vsi)
 {
 	int ret = -ENODEV;
-	i40e_status aq_ret = 0;
 	struct i40e_pf *pf = vsi->back;
 	struct i40e_hw *hw = &pf->hw;
 	struct i40e_vsi_context ctxt;
@@ -9518,18 +9594,6 @@ static int i40e_add_vsi(struct i40e_vsi *vsi)
 		vsi->seid = ctxt.seid;
 		vsi->id = ctxt.vsi_number;
 	}
-	/* Except FDIR VSI, for all othet VSI set the broadcast filter */
-	if (vsi->type != I40E_VSI_FDIR) {
-		aq_ret = i40e_aq_set_vsi_broadcast(hw, vsi->seid, true, NULL);
-		if (aq_ret) {
-			ret = i40e_aq_rc_to_posix(aq_ret,
-						  hw->aq.asq_last_status);
-			dev_info(&pf->pdev->dev,
-				 "set brdcast promisc failed, err %s, aq_err %s\n",
-				 i40e_stat_str(hw, aq_ret),
-				 i40e_aq_str(hw, hw->aq.asq_last_status));
-		}
-	}
 
 	vsi->active_filters = 0;
 	clear_bit(__I40E_FILTER_OVERFLOW_PROMISC, &vsi->state);