netdev - [PATCH net-next] Revert "net/sched: cls_flower: Remove match on n

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Message-Id: <20210621092429.10043-1-boris.sukholitko@broadcom.com>
Date:   Mon, 21 Jun 2021 12:24:29 +0300
From:   Boris Sukholitko <boris.sukholitko@...adcom.com>
To:     netdev@...r.kernel.org, Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Cong Wang <xiyou.wangcong@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Vladimir Oltean <olteanv@...il.com>,
        Vadym Kochan <vadym.kochan@...ision.eu>,
        Ilya Lifshits <ilya.lifshits@...adcom.com>,
        Boris Sukholitko <boris.sukholitko@...adcom.com>
Subject: [PATCH net-next] Revert "net/sched: cls_flower: Remove match on n_proto"

This reverts commit 0dca2c7404a938cb10c85d0515cee40ed5348788.

The commit in question breaks hardware offload of flower filters.

Quoting Vladimir Oltean <olteanv@...il.com>:

 fl_hw_replace_filter() and fl_reoffload() create a struct
 flow_cls_offload with a rule->match.mask member derived from the mask
 of the software classifier: &f->mask->key - that same mask that is used
 for initializing the flow dissector keys, and the one from which Boris
 removed the basic.n_proto member because it was bothering him.

Reported-by: Vadym Kochan <vadym.kochan@...ision.eu>
Signed-off-by: Boris Sukholitko <boris.sukholitko@...adcom.com>
---
 net/sched/cls_flower.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 2e704c7a105a..d7869a984881 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -1531,13 +1531,14 @@ static int fl_set_key(struct net *net, struct nlattr **tb,
 						       &mask->basic.n_proto,
 						       TCA_FLOWER_UNSPEC,
 						       sizeof(key->basic.n_proto));
-					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);
 		}
 	}
 
-- 
2.29.3


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