netdev - [PATCH net-next] net: mscc: ocelot: offload tc action "ok" using an empty action vector

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Date:   Sun, 22 May 2022 12:27:01 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vladimir Oltean <olteanv@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com,
        Colin Foster <colin.foster@...advantage.com>,
        Xiaoliang Yang <xiaoliang.yang_1@....com>
Subject: [PATCH net-next] net: mscc: ocelot: offload tc action "ok" using an empty action vector

The "ok" tc action is useful when placed in front of a more generic
filter to exclude some more specific rules from matching it.

The ocelot switches can offload this tc action by creating an empty
action vector (no _ENA fields set to 1). This makes sense for all of
VCAP IS1, IS2 and ES0 (but not for PSFP).

Add support for this action. Note that this makes the
gact_drop_and_ok_test() selftest pass, where "action ok" is used in
front of an "action drop" rule, both offloaded to VCAP IS2.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/ethernet/mscc/ocelot_flower.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/net/ethernet/mscc/ocelot_flower.c b/drivers/net/ethernet/mscc/ocelot_flower.c
index 51cf241ff7d0..7c0897e779dc 100644
--- a/drivers/net/ethernet/mscc/ocelot_flower.c
+++ b/drivers/net/ethernet/mscc/ocelot_flower.c
@@ -279,6 +279,22 @@ static int ocelot_flower_parse_action(struct ocelot *ocelot, int port,
 			filter->action.pol_ix = OCELOT_POLICER_DISCARD;
 			filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
 			break;
+		case FLOW_ACTION_ACCEPT:
+			if (filter->block_id != VCAP_ES0 &&
+			    filter->block_id != VCAP_IS1 &&
+			    filter->block_id != VCAP_IS2) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Accept action can only be offloaded to VCAP chains");
+				return -EOPNOTSUPP;
+			}
+			if (filter->block_id != VCAP_ES0 &&
+			    filter->goto_target != -1) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Last action must be GOTO");
+				return -EOPNOTSUPP;
+			}
+			filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
+			break;
 		case FLOW_ACTION_TRAP:
 			if (filter->block_id != VCAP_IS2 ||
 			    filter->lookup != 0) {
-- 
2.25.1