netdev - [PATCH net-next] nfp: flower: support case of match on ct

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Message-Id: <20220823090122.403631-1-simon.horman@corigine.com>
Date:   Tue, 23 Aug 2022 11:01:22 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, oss-drivers@...igine.com,
        Wenjuan Geng <wenjuan.geng@...igine.com>
Subject: [PATCH net-next] nfp: flower: support case of match on ct_state(0/0x3f)

From: Wenjuan Geng <wenjuan.geng@...igine.com>

is_post_ct_flow() function will process only ct_state ESTABLISHED,
then offload_pre_check() function will check FLOW_DISSECTOR_KEY_CT flag.
When config tc filter match ct_state(0/0x3f), dissector->used_keys
with FLOW_DISSECTOR_KEY_CT bit, function offload_pre_check() will
return false, so not offload. This is a special case that can be handled
safely.

Therefore, modify to let initial packet which won't go through conntrack
can be offloaded, as long as the cared ct fields are all zero.

Signed-off-by: Wenjuan Geng <wenjuan.geng@...igine.com>
Reviewed-by: Louis Peens <louis.peens@...igine.com>
Signed-off-by: Simon Horman <simon.horman@...igine.com>
---
 drivers/net/ethernet/netronome/nfp/flower/offload.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/flower/offload.c b/drivers/net/ethernet/netronome/nfp/flower/offload.c
index 83c97154c0c7..3ab3e4536b99 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/offload.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/offload.c
@@ -1301,9 +1301,14 @@ static bool offload_pre_check(struct flow_cls_offload *flow)
 {
 	struct flow_rule *rule = flow_cls_offload_flow_rule(flow);
 	struct flow_dissector *dissector = rule->match.dissector;
+	struct flow_match_ct ct;
 
-	if (dissector->used_keys & BIT(FLOW_DISSECTOR_KEY_CT))
-		return false;
+	if (dissector->used_keys & BIT(FLOW_DISSECTOR_KEY_CT)) {
+		flow_rule_match_ct(rule, &ct);
+		/* Allow special case where CT match is all 0 */
+		if (memchr_inv(ct.key, 0, sizeof(*ct.key)))
+			return false;
+	}
 
 	if (flow->common.chain_index)
 		return false;
-- 
2.30.2