[RFC net-next] net/sched: cls_flower: fix resetting of ether proto mask

[Vadym Kochan]

In case of matching 'protocol' the rule does not work:

    tc filter add dev $DEV ingress prio 1 protocol $PROTO flower skip_sw action drop

so clear the ether proto mask only for CVLAN case.

Fixes: 0dca2c7404a9 ("net/sched: cls_flower: Remove match on n_proto")
CC: Boris Sukholitko <boris.sukholitko@xxxxxxxxxxxx>
Signed-off-by: Vadym Kochan <vadym.kochan@xxxxxxxxxxx>
---
I am still in testing process of the patch but reverting of
referrenced commit solved the issue.

The issue was observed on Marvel Prestera ACL patches
with HW offloaded TC rules.

 net/sched/cls_flower.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 2e704c7a105a..997ca0549c45 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -1534,10 +1534,13 @@ static int fl_set_key(struct net *net, struct nlattr **tb,
 					mask->basic.n_proto = cpu_to_be16(0);
 				} else {
 					key->basic.n_proto = ethertype;
+					mask->basic.n_proto = cpu_to_be16(~0);
+
 				}
 			}
 		} else {
 			key->basic.n_proto = ethertype;
+			mask->basic.n_proto = cpu_to_be16(~0);
 		}
 	}
 
-- 
2.17.1