From: Kurt Kanzenbach <kurt@linutronix.de>
Date: Mon, 28 Jun 2021 21:43:31 -0700
Subject: igc: Make flex filter more flexible
Patch-mainline: v5.15-rc1
Git-commit: 73744262210c4560efb2d89385c6219739d16bbd
References: jsc#SLE-18377

Currently flex filters are only used for filters containing user data.
However, it makes sense to utilize them also for filters having
multiple conditions, because that's not supported by the driver at the
moment. Add it.

Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/intel/igc/igc.h         |    1 +
 drivers/net/ethernet/intel/igc/igc_ethtool.c |   27 ++++++++++++++++-----------
 drivers/net/ethernet/intel/igc/igc_main.c    |   14 +++++---------
 3 files changed, 22 insertions(+), 20 deletions(-)

--- a/drivers/net/ethernet/intel/igc/igc.h
+++ b/drivers/net/ethernet/intel/igc/igc.h
@@ -507,6 +507,7 @@ struct igc_nfc_rule {
 	struct igc_nfc_filter filter;
 	u32 location;
 	u16 action;
+	bool flex;
 };
 
 /* IGC supports a total of 32 NFC rules: 16 MAC address based, 8 VLAN priority
--- a/drivers/net/ethernet/intel/igc/igc_ethtool.c
+++ b/drivers/net/ethernet/intel/igc/igc_ethtool.c
@@ -1222,19 +1222,29 @@ static void igc_ethtool_init_nfc_rule(st
 				fsp->h_u.ether_spec.h_dest);
 	}
 
+	/* VLAN etype matching */
+	if ((fsp->flow_type & FLOW_EXT) && fsp->h_ext.vlan_etype) {
+		rule->filter.vlan_etype = fsp->h_ext.vlan_etype;
+		rule->filter.match_flags |= IGC_FILTER_FLAG_VLAN_ETYPE;
+	}
+
 	/* Check for user defined data */
 	if ((fsp->flow_type & FLOW_EXT) &&
 	    (fsp->h_ext.data[0] || fsp->h_ext.data[1])) {
 		rule->filter.match_flags |= IGC_FILTER_FLAG_USER_DATA;
 		memcpy(rule->filter.user_data, fsp->h_ext.data, sizeof(fsp->h_ext.data));
 		memcpy(rule->filter.user_mask, fsp->m_ext.data, sizeof(fsp->m_ext.data));
-
-		/* VLAN etype matching is only valid using flex filter */
-		if ((fsp->flow_type & FLOW_EXT) && fsp->h_ext.vlan_etype) {
-			rule->filter.vlan_etype = fsp->h_ext.vlan_etype;
-			rule->filter.match_flags |= IGC_FILTER_FLAG_VLAN_ETYPE;
-		}
 	}
+
+	/* When multiple filter options or user data or vlan etype is set, use a
+	 * flex filter.
+	 */
+	if ((rule->filter.match_flags & IGC_FILTER_FLAG_USER_DATA) ||
+	    (rule->filter.match_flags & IGC_FILTER_FLAG_VLAN_ETYPE) ||
+	    (rule->filter.match_flags & (rule->filter.match_flags - 1)))
+		rule->flex = true;
+	else
+		rule->flex = false;
 }
 
 /**
@@ -1264,11 +1274,6 @@ static int igc_ethtool_check_nfc_rule(st
 		return -EINVAL;
 	}
 
-	if (flags & (flags - 1)) {
-		netdev_dbg(dev, "Rule with multiple matches not supported\n");
-		return -EOPNOTSUPP;
-	}
-
 	list_for_each_entry(tmp, &adapter->nfc_rule_list, list) {
 		if (!memcmp(&rule->filter, &tmp->filter,
 			    sizeof(rule->filter)) &&
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -3388,14 +3388,8 @@ static int igc_enable_nfc_rule(struct ig
 {
 	int err;
 
-	/* Check for user data first: When user data is set, the only option is
-	 * to use a flex filter. When more options are set (ethertype, vlan tci,
-	 * ...) construct a flex filter matching all of that.
-	 */
-	if (rule->filter.match_flags & IGC_FILTER_FLAG_USER_DATA) {
-		err = igc_add_flex_filter(adapter, rule);
-		if (err)
-			return err;
+	if (rule->flex) {
+		return igc_add_flex_filter(adapter, rule);
 	}
 
 	if (rule->filter.match_flags & IGC_FILTER_FLAG_ETHER_TYPE) {
@@ -3434,8 +3428,10 @@ static int igc_enable_nfc_rule(struct ig
 static void igc_disable_nfc_rule(struct igc_adapter *adapter,
 				 const struct igc_nfc_rule *rule)
 {
-	if (rule->filter.match_flags & IGC_FILTER_FLAG_USER_DATA)
+	if (rule->flex) {
 		igc_del_flex_filter(adapter, rule->filter.flex_index);
+		return;
+	}
 
 	if (rule->filter.match_flags & IGC_FILTER_FLAG_ETHER_TYPE)
 		igc_del_etype_filter(adapter, rule->filter.etype);