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From:   Suman Ghosh <sumang@marvell.com>
To:     <sgoutham@marvell.com>, <gakula@marvell.com>,
        <sbhatta@marvell.com>, <hkelam@marvell.com>, <davem@davemloft.net>,
        <edumazet@google.com>, <kuba@kernel.org>, <pabeni@redhat.com>,
        <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>
CC:     Suman Ghosh <sumang@marvell.com>
Subject: [PATCH V4] octeontx2-pf: Add additional check for MCAM rules
Date:   Thu, 6 Jul 2023 23:07:23 +0530
Message-ID: <20230706173723.2226030-1-sumang@marvell.com>
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Due to hardware limitation, MCAM drop rule with
ether_type == 802.1Q and vlan_id == 0 is not supported. Hence rejecting
such rules.

Fixes: dce677da57c0 ("octeontx2-pf: Add vlan-etype to ntuple filters")
Signed-off-by: Suman Ghosh <sumang@marvell.com>
---
Changes since v3:
- moved assignment of vlan_etype before the if check
  
 .../net/ethernet/marvell/octeontx2/nic/otx2_flows.c |  8 ++++++++
 .../net/ethernet/marvell/octeontx2/nic/otx2_tc.c    | 13 +++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
index 10e11262d48a..2d7713a1a153 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
@@ -872,6 +872,14 @@ static int otx2_prepare_flow_request(struct ethtool_rx_flow_spec *fsp,
 				return -EINVAL;
 
 			vlan_etype = be16_to_cpu(fsp->h_ext.vlan_etype);
+
+			/* Drop rule with vlan_etype == 802.1Q
+			 * and vlan_id == 0 is not supported
+			 */
+			if (vlan_etype == ETH_P_8021Q && !fsp->m_ext.vlan_tci &&
+			    fsp->ring_cookie == RX_CLS_FLOW_DISC)
+				return -EINVAL;
+
 			/* Only ETH_P_8021Q and ETH_P_802AD types supported */
 			if (vlan_etype != ETH_P_8021Q &&
 			    vlan_etype != ETH_P_8021AD)
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c
index 044cc211424e..6c0fdc2bad73 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c
@@ -604,6 +604,19 @@ static int otx2_tc_prepare_flow(struct otx2_nic *nic, struct otx2_tc_flow *node,
 			return -EOPNOTSUPP;
 		}
 
+		if (!match.mask->vlan_id) {
+			struct flow_action_entry *act;
+			int i;
+
+			flow_action_for_each(i, act, &rule->action) {
+				if (act->id == FLOW_ACTION_DROP) {
+					netdev_err(nic->netdev, "vlan tpid 0x%x with vlan_id %d is not supported for DROP rule.\n",
+						   ntohs(match.key->vlan_tpid), match.key->vlan_id);
+					return -EOPNOTSUPP;
+				}
+			}
+		}
+
 		if (match.mask->vlan_id ||
 		    match.mask->vlan_dei ||
 		    match.mask->vlan_priority) {
-- 
2.25.1