[PATCH net-next v2 2/2] flow_offload: reject offload for all drivers with invalid police parameters

[Jianbo Liu <jianbol@nvidia.com>]

As more police parameters are passed to flow_offload, driver can check
them to make sure hardware handles packets in the way indicated by tc.
The conform-exceed control should be drop/pipe or drop/ok. Besides,
for drop/ok, the police should be the last action. As hardware can't
configure peakrate/avrate/overhead, offload should not be supported if
any of them is configured.

Signed-off-by: Jianbo Liu <jianbol@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
---
 drivers/net/dsa/sja1105/sja1105_flower.c      | 27 +++++++++
 .../chelsio/cxgb4/cxgb4_tc_matchall.c         | 55 +++++++++++++++++++
 .../net/ethernet/freescale/enetc/enetc_qos.c  | 31 +++++++++++
 .../ethernet/marvell/octeontx2/nic/otx2_tc.c  | 54 ++++++++++++++++++
 .../net/ethernet/mellanox/mlx5/core/en_tc.c   | 27 +++++++++
 .../ethernet/mellanox/mlxsw/spectrum_flower.c | 27 +++++++++
 drivers/net/ethernet/mscc/ocelot_flower.c     | 28 ++++++++++
 drivers/net/ethernet/mscc/ocelot_net.c        | 27 +++++++++
 .../ethernet/netronome/nfp/flower/qos_conf.c  | 28 ++++++++++
 include/net/flow_offload.h                    |  6 ++
 10 files changed, 310 insertions(+)

diff --git a/drivers/net/dsa/sja1105/sja1105_flower.c b/drivers/net/dsa/sja1105/sja1105_flower.c
index 7dcdd784aea4..8a14df8cf91e 100644
--- a/drivers/net/dsa/sja1105/sja1105_flower.c
+++ b/drivers/net/dsa/sja1105/sja1105_flower.c
@@ -321,6 +321,33 @@ int sja1105_cls_flower_add(struct dsa_switch *ds, int port,
 	flow_action_for_each(i, act, &rule->action) {
 		switch (act->id) {
 		case FLOW_ACTION_POLICE:
+			if (act->police.exceed.act_id != FLOW_ACTION_DROP) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the exceed action is not drop");
+				return -EOPNOTSUPP;
+			}
+
+			if (act->police.notexceed.act_id != FLOW_ACTION_PIPE &&
+			    act->police.notexceed.act_id != FLOW_ACTION_ACCEPT) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the conform action is not pipe or ok");
+				return -EOPNOTSUPP;
+			}
+
+			if (act->police.notexceed.act_id == FLOW_ACTION_ACCEPT &&
+			    !flow_action_is_last_entry(&rule->action, act)) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the conform action is ok, but police action is not last");
+				return -EOPNOTSUPP;
+			}
+
+			if (act->police.peakrate_bytes_ps ||
+			    act->police.avrate || act->police.overhead) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when peakrate/avrate/overhead is configured");
+				return -EOPNOTSUPP;
+			}
+
 			if (act->police.rate_pkt_ps) {
 				NL_SET_ERR_MSG_MOD(extack,
 						   "QoS offload not support packets per second");
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_matchall.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_matchall.c
index 28fd2de9e4cf..124e65116b2d 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_matchall.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_matchall.c
@@ -48,6 +48,33 @@ static int cxgb4_matchall_egress_validate(struct net_device *dev,
 	flow_action_for_each(i, entry, actions) {
 		switch (entry->id) {
 		case FLOW_ACTION_POLICE:
+			if (entry->police.exceed.act_id != FLOW_ACTION_DROP) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the exceed action is not drop");
+				return -EOPNOTSUPP;
+			}
+
+			if (entry->police.notexceed.act_id != FLOW_ACTION_PIPE &&
+			    entry->police.notexceed.act_id != FLOW_ACTION_ACCEPT) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the conform action is not pipe or ok");
+				return -EOPNOTSUPP;
+			}
+
+			if (entry->police.notexceed.act_id == FLOW_ACTION_ACCEPT &&
+			    !flow_action_is_last_entry(actions, entry)) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the conform action is ok, but police action is not last");
+				return -EOPNOTSUPP;
+			}
+
+			if (entry->police.peakrate_bytes_ps ||
+			    entry->police.avrate || entry->police.overhead) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when peakrate/avrate/overhead is configured");
+				return -EOPNOTSUPP;
+			}
+
 			if (entry->police.rate_pkt_ps) {
 				NL_SET_ERR_MSG_MOD(extack,
 						   "QoS offload not support packets per second");
@@ -150,6 +177,34 @@ static int cxgb4_matchall_alloc_tc(struct net_device *dev,
 	flow_action_for_each(i, entry, &cls->rule->action)
 		if (entry->id == FLOW_ACTION_POLICE)
 			break;
+
+	if (entry->police.exceed.act_id != FLOW_ACTION_DROP) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Police offload is not supported when the exceed action is not drop");
+		return -EOPNOTSUPP;
+	}
+
+	if (entry->police.notexceed.act_id != FLOW_ACTION_PIPE &&
+	    entry->police.notexceed.act_id != FLOW_ACTION_ACCEPT) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Police offload is not supported when the conform action is not pipe or ok");
+		return -EOPNOTSUPP;
+	}
+
+	if (entry->police.notexceed.act_id == FLOW_ACTION_ACCEPT &&
+	    !flow_action_is_last_entry(&cls->rule->action, entry)) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Police offload is not supported when the conform action is ok, but police action is not last");
+		return -EOPNOTSUPP;
+	}
+
+	if (entry->police.peakrate_bytes_ps ||
+	    entry->police.avrate || entry->police.overhead) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Police offload is not supported when peakrate/avrate/overhead is configured");
+		return -EOPNOTSUPP;
+	}
+
 	if (entry->police.rate_pkt_ps) {
 		NL_SET_ERR_MSG_MOD(extack,
 				   "QoS offload not support packets per second");
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_qos.c b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
index 3555c12edb45..c992d9e86467 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_qos.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
@@ -1230,6 +1230,37 @@ static int enetc_psfp_parse_clsflower(struct enetc_ndev_priv *priv,
 
 	/* Flow meter and max frame size */
 	if (entryp) {
+		if (entryp->police.exceed.act_id != FLOW_ACTION_DROP) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Police offload is not supported when the exceed action is not drop");
+			err = -EOPNOTSUPP;
+			goto free_sfi;
+		}
+
+		if (entryp->police.notexceed.act_id != FLOW_ACTION_PIPE &&
+		    entryp->police.notexceed.act_id != FLOW_ACTION_ACCEPT) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Police offload is not supported when the conform action is not pipe or ok");
+			err = -EOPNOTSUPP;
+			goto free_sfi;
+		}
+
+		if (entryp->police.notexceed.act_id == FLOW_ACTION_ACCEPT &&
+		    !flow_action_is_last_entry(&rule->action, entryp)) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Police offload is not supported when the conform action is ok, but police action is not last");
+			err = -EOPNOTSUPP;
+			goto free_sfi;
+		}
+
+		if (entryp->police.peakrate_bytes_ps ||
+		    entryp->police.avrate || entryp->police.overhead) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Police offload is not supported when peakrate/avrate/overhead is configured");
+			err = -EOPNOTSUPP;
+			goto free_sfi;
+		}
+
 		if (entryp->police.rate_pkt_ps) {
 			NL_SET_ERR_MSG_MOD(extack, "QoS offload not support packets per second");
 			err = -EOPNOTSUPP;
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c
index 626961a41089..4b6e17765b2f 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c
@@ -212,6 +212,33 @@ static int otx2_tc_egress_matchall_install(struct otx2_nic *nic,
 	entry = &cls->rule->action.entries[0];
 	switch (entry->id) {
 	case FLOW_ACTION_POLICE:
+		if (entry->police.exceed.act_id != FLOW_ACTION_DROP) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Police offload is not supported when the exceed action is not drop");
+			return -EOPNOTSUPP;
+		}
+
+		if (entry->police.notexceed.act_id != FLOW_ACTION_PIPE &&
+		    entry->police.notexceed.act_id != FLOW_ACTION_ACCEPT) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Police offload is not supported when the conform action is not pipe or ok");
+			return -EOPNOTSUPP;
+		}
+
+		if (entry->police.notexceed.act_id == FLOW_ACTION_ACCEPT &&
+		    !flow_action_is_last_entry(&cls->rule->action, entry)) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Police offload is not supported when the conform action is ok, but police action is not last");
+			return -EOPNOTSUPP;
+		}
+
+		if (entry->police.peakrate_bytes_ps ||
+		    entry->police.avrate || entry->police.overhead) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Police offload is not supported when peakrate/avrate/overhead is configured");
+			return -EOPNOTSUPP;
+		}
+
 		if (entry->police.rate_pkt_ps) {
 			NL_SET_ERR_MSG_MOD(extack, "QoS offload not support packets per second");
 			return -EOPNOTSUPP;
@@ -355,6 +382,33 @@ static int otx2_tc_parse_actions(struct otx2_nic *nic,
 				return -EOPNOTSUPP;
 			}
 
+			if (act->police.exceed.act_id != FLOW_ACTION_DROP) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the exceed action is not drop");
+				return -EOPNOTSUPP;
+			}
+
+			if (act->police.notexceed.act_id != FLOW_ACTION_PIPE &&
+			    act->police.notexceed.act_id != FLOW_ACTION_ACCEPT) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the conform action is not pipe or ok");
+				return -EOPNOTSUPP;
+			}
+
+			if (act->police.notexceed.act_id == FLOW_ACTION_ACCEPT &&
+			    !flow_action_is_last_entry(flow_action, act)) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the conform action is ok, but police action is not last");
+				return -EOPNOTSUPP;
+			}
+
+			if (act->police.peakrate_bytes_ps ||
+			    act->police.avrate || act->police.overhead) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when peakrate/avrate/overhead is configured");
+				return -EOPNOTSUPP;
+			}
+
 			if (act->police.rate_bytes_ps > 0) {
 				rate = act->police.rate_bytes_ps * 8;
 				burst = act->police.burst;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 1287193a019b..7c160961c92e 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -4197,6 +4197,33 @@ static int scan_tc_matchall_fdb_actions(struct mlx5e_priv *priv,
 	flow_action_for_each(i, act, flow_action) {
 		switch (act->id) {
 		case FLOW_ACTION_POLICE:
+			if (act->police.exceed.act_id != FLOW_ACTION_DROP) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the exceed action is not drop");
+				return -EOPNOTSUPP;
+			}
+
+			if (act->police.notexceed.act_id != FLOW_ACTION_PIPE &&
+			    act->police.notexceed.act_id != FLOW_ACTION_ACCEPT) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the conform action is not pipe or ok");
+				return -EOPNOTSUPP;
+			}
+
+			if (act->police.notexceed.act_id == FLOW_ACTION_ACCEPT &&
+			    !flow_action_is_last_entry(flow_action, act)) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the conform action is ok, but police action is not last");
+				return -EOPNOTSUPP;
+			}
+
+			if (act->police.peakrate_bytes_ps ||
+			    act->police.avrate || act->police.overhead) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when peakrate/avrate/overhead is configured");
+				return -EOPNOTSUPP;
+			}
+
 			if (act->police.rate_pkt_ps) {
 				NL_SET_ERR_MSG_MOD(extack, "QoS offload not support packets per second");
 				return -EOPNOTSUPP;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
index bb417db773b9..b33c3da4daf8 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
@@ -191,6 +191,33 @@ static int mlxsw_sp_flower_parse_actions(struct mlxsw_sp *mlxsw_sp,
 				return -EOPNOTSUPP;
 			}
 
+			if (act->police.exceed.act_id != FLOW_ACTION_DROP) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the exceed action is not drop");
+				return -EOPNOTSUPP;
+			}
+
+			if (act->police.notexceed.act_id != FLOW_ACTION_PIPE &&
+			    act->police.notexceed.act_id != FLOW_ACTION_ACCEPT) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the conform action is not pipe or ok");
+				return -EOPNOTSUPP;
+			}
+
+			if (act->police.notexceed.act_id == FLOW_ACTION_ACCEPT &&
+			    !flow_action_is_last_entry(flow_action, act)) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the conform action is ok, but police action is not last");
+				return -EOPNOTSUPP;
+			}
+
+			if (act->police.peakrate_bytes_ps ||
+			    act->police.avrate || act->police.overhead) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when peakrate/avrate/overhead is configured");
+				return -EOPNOTSUPP;
+			}
+
 			if (act->police.rate_pkt_ps) {
 				NL_SET_ERR_MSG_MOD(extack, "QoS offload not support packets per second");
 				return -EOPNOTSUPP;
diff --git a/drivers/net/ethernet/mscc/ocelot_flower.c b/drivers/net/ethernet/mscc/ocelot_flower.c
index 949858891973..eb478ddb0f90 100644
--- a/drivers/net/ethernet/mscc/ocelot_flower.c
+++ b/drivers/net/ethernet/mscc/ocelot_flower.c
@@ -296,6 +296,34 @@ static int ocelot_flower_parse_action(struct ocelot *ocelot, int port,
 						   "Last action must be GOTO");
 				return -EOPNOTSUPP;
 			}
+
+			if (a->police.exceed.act_id != FLOW_ACTION_DROP) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the exceed action is not drop");
+				return -EOPNOTSUPP;
+			}
+
+			if (a->police.notexceed.act_id != FLOW_ACTION_PIPE &&
+			    a->police.notexceed.act_id != FLOW_ACTION_ACCEPT) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the conform action is not pipe or ok");
+				return -EOPNOTSUPP;
+			}
+
+			if (a->police.notexceed.act_id == FLOW_ACTION_ACCEPT &&
+			    !flow_action_is_last_entry(&f->rule->action, a)) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when the conform action is ok, but police action is not last");
+				return -EOPNOTSUPP;
+			}
+
+			if (a->police.peakrate_bytes_ps ||
+			    a->police.avrate || a->police.overhead) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Police offload is not supported when peakrate/avrate/overhead is configured");
+				return -EOPNOTSUPP;
+			}
+
 			if (a->police.rate_pkt_ps) {
 				NL_SET_ERR_MSG_MOD(extack,
 						   "QoS offload not support packets per second");
diff --git a/drivers/net/ethernet/mscc/ocelot_net.c b/drivers/net/ethernet/mscc/ocelot_net.c
index e271b6225b72..69afb560ab98 100644
--- a/drivers/net/ethernet/mscc/ocelot_net.c
+++ b/drivers/net/ethernet/mscc/ocelot_net.c
@@ -258,6 +258,33 @@ static int ocelot_setup_tc_cls_matchall(struct ocelot_port_private *priv,
 			return -EEXIST;
 		}
 
+		if (action->police.exceed.act_id != FLOW_ACTION_DROP) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Police offload is not supported when the exceed action is not drop");
+			return -EOPNOTSUPP;
+		}
+
+		if (action->police.notexceed.act_id != FLOW_ACTION_PIPE &&
+		    action->police.notexceed.act_id != FLOW_ACTION_ACCEPT) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Police offload is not supported when the conform action is not pipe or ok");
+			return -EOPNOTSUPP;
+		}
+
+		if (action->police.notexceed.act_id == FLOW_ACTION_ACCEPT &&
+		    !flow_action_is_last_entry(&f->rule->action, action)) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Police offload is not supported when the conform action is ok, but police action is not last");
+			return -EOPNOTSUPP;
+		}
+
+		if (action->police.peakrate_bytes_ps ||
+		    action->police.avrate || action->police.overhead) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Police offload is not supported when peakrate/avrate/overhead is configured");
+			return -EOPNOTSUPP;
+		}
+
 		if (action->police.rate_pkt_ps) {
 			NL_SET_ERR_MSG_MOD(extack,
 					   "QoS offload not support packets per second");
diff --git a/drivers/net/ethernet/netronome/nfp/flower/qos_conf.c b/drivers/net/ethernet/netronome/nfp/flower/qos_conf.c
index 784c6dbf8bc4..247984d50b49 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/qos_conf.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/qos_conf.c
@@ -132,6 +132,34 @@ nfp_flower_install_rate_limiter(struct nfp_app *app, struct net_device *netdev,
 					   "unsupported offload: qos rate limit offload requires police action");
 			return -EOPNOTSUPP;
 		}
+
+		if (action->police.exceed.act_id != FLOW_ACTION_DROP) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Police offload is not supported when the exceed action is not drop");
+			return -EOPNOTSUPP;
+		}
+
+		if (action->police.notexceed.act_id != FLOW_ACTION_PIPE &&
+		    action->police.notexceed.act_id != FLOW_ACTION_ACCEPT) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Police offload is not supported when the conform action is not pipe or ok");
+			return -EOPNOTSUPP;
+		}
+
+		if (action->police.notexceed.act_id == FLOW_ACTION_ACCEPT &&
+		    !flow_action_is_last_entry(&flow->rule->action, action)) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Police offload is not supported when the conform action is ok, but police action is not last");
+			return -EOPNOTSUPP;
+		}
+
+		if (action->police.peakrate_bytes_ps ||
+		    action->police.avrate || action->police.overhead) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Police offload is not supported when peakrate/avrate/overhead is configured");
+			return -EOPNOTSUPP;
+		}
+
 		if (action->police.rate_bytes_ps > 0) {
 			if (bps_num++) {
 				NL_SET_ERR_MSG_MOD(extack,
diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h
index 94cde6bbc8a5..2b9890177aa1 100644
--- a/include/net/flow_offload.h
+++ b/include/net/flow_offload.h
@@ -315,6 +315,12 @@ static inline bool flow_offload_has_one_action(const struct flow_action *action)
 	return action->num_entries == 1;
 }
 
+static inline bool flow_action_is_last_entry(const struct flow_action *action,
+					     const struct flow_action_entry *entry)
+{
+	return entry == &action->entries[action->num_entries - 1];
+}
+
 #define flow_action_for_each(__i, __act, __actions)			\
         for (__i = 0, __act = &(__actions)->entries[0];			\
 	     __i < (__actions)->num_entries;				\
-- 
2.26.2