[net PATCH V2] octeontx2-pf: Add additional check for MCAM rules.

Suman Ghosh
2023-07-03T10:00:21Z

Due to hardware limitation, MCAM drop rule with
ether_type == 802.1Q and vlan_id == 0 is not supported. Hence rejecting
such rules.

Signed-off-by: Suman Ghosh <sumang@marvell.com>
---
Changes since v1:
- Updated commit message

.../net/ethernet/marvell/octeontx2/nic/otx2_flows.c | 7 +++++++
.../net/ethernet/marvell/octeontx2/nic/otx2_tc.c | 13 +++++++++++++
2 files changed, 20 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..49ba27875111 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
@@ -871,6 +871,13 @@ static int otx2_prepare_flow_request(struct ethtool_rx_flow_spec *fsp,
if (be16_to_cpu(fsp->m_ext.vlan_etype) != 0xFFFF)
return -EINVAL;

+ /* 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;
+
vlan_etype = be16_to_cpu(fsp->h_ext.vlan_etype);
/* Only ETH_P_8021Q and ETH_P_802AD types supported */
if (vlan_etype != ETH_P_8021Q &&
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