From: Rahul Kundu <rahul.kundu@chelsio.com>
Date: Thu, 20 Aug 2020 16:31:36 +0530
Subject: cxgb4: insert IPv6 filter rules in next free region
Patch-mainline: v5.10-rc1
Git-commit: 1e76a2ff317d0dd9db60b5d9bb6e8215c1513fa8
References: jsc#SLE-15131

IPv6 filters can occupy up to 4 slots and will exhaust HPFILTER
region much sooner. So, continue searching for free slots in the
HASH or NORMAL filter regions, as long as the rule's priority does
not conflict with existing rules in those regions.

Signed-off-by: Rahul Kundu <rahul.kundu@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c |   17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
@@ -604,17 +604,14 @@ int cxgb4_get_free_ftid(struct net_devic
 			/* If the new rule wants to get inserted into
 			 * HPFILTER region, but its prio is greater
 			 * than the rule with the highest prio in HASH
-			 * region, then reject the rule.
+			 * region, or if there's not enough slots
+			 * available in HPFILTER region, then skip
+			 * trying to insert this rule into HPFILTER
+			 * region and directly go to the next region.
 			 */
-			if (t->tc_hash_tids_max_prio &&
-			    tc_prio > t->tc_hash_tids_max_prio)
-				break;
-
-			/* If there's not enough slots available
-			 * in HPFILTER region, then move on to
-			 * normal FILTER region immediately.
-			 */
-			if (ftid + n > t->nhpftids) {
+			if ((t->tc_hash_tids_max_prio &&
+			     tc_prio > t->tc_hash_tids_max_prio) ||
+			     (ftid + n) > t->nhpftids) {
 				ftid = t->nhpftids;
 				continue;
 			}