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From: Abhiram R N <abhiramrn@gmail.com>
To: saeedm@nvidia.com
Cc: abhiramrn@gmail.com, hakhande@redhat.com, arn@redhat.com,
	Leon Romanovsky <leon@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	netdev@vger.kernel.org, linux-rdma@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH] net/mlx5e: Add extack msgs related to TC for better debug
Date: Thu, 26 Aug 2021 16:32:53 +0530	[thread overview]
Message-ID: <20210826110253.311456-1-abhiramrn@gmail.com> (raw)

As multiple places EOPNOTSUPP and EINVAL is returned from driver
it becomes difficult to understand the reason only with error code.
With the netlink extack message exact reason will be known and will
aid in debugging.

Signed-off-by: Abhiram R N <abhiramrn@gmail.com>
---
 .../net/ethernet/mellanox/mlx5/core/en_tc.c   | 121 +++++++++++++-----
 1 file changed, 87 insertions(+), 34 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index d273758255c3..87faffda388d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -1894,8 +1894,10 @@ static int parse_tunnel_attr(struct mlx5e_priv *priv,
 	bool needs_mapping, sets_mapping;
 	int err;
 
-	if (!mlx5e_is_eswitch_flow(flow))
+	if (!mlx5e_is_eswitch_flow(flow)) {
+		NL_SET_ERR_MSG_MOD(extack, "Not an eswitch Flow");
 		return -EOPNOTSUPP;
+	}
 
 	needs_mapping = !!flow->attr->chain;
 	sets_mapping = !flow->attr->chain && flow_has_tc_fwd_action(f);
@@ -2267,8 +2269,10 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 		addr_type = match.key->addr_type;
 
 		/* the HW doesn't support frag first/later */
-		if (match.mask->flags & FLOW_DIS_FIRST_FRAG)
+		if (match.mask->flags & FLOW_DIS_FIRST_FRAG) {
+			NL_SET_ERR_MSG_MOD(extack, "HW doesn't support frag first/later");
 			return -EOPNOTSUPP;
+		}
 
 		if (match.mask->flags & FLOW_DIS_IS_FRAGMENT) {
 			MLX5_SET(fte_match_set_lyr_2_4, headers_c, frag, 1);
@@ -2435,8 +2439,11 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 		switch (ip_proto) {
 		case IPPROTO_ICMP:
 			if (!(MLX5_CAP_GEN(priv->mdev, flex_parser_protocols) &
-			      MLX5_FLEX_PROTO_ICMP))
+			      MLX5_FLEX_PROTO_ICMP)) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Match on Flex protocols for ICMP not supported");
 				return -EOPNOTSUPP;
+			}
 			MLX5_SET(fte_match_set_misc3, misc_c_3, icmp_type,
 				 match.mask->type);
 			MLX5_SET(fte_match_set_misc3, misc_v_3, icmp_type,
@@ -2448,8 +2455,11 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 			break;
 		case IPPROTO_ICMPV6:
 			if (!(MLX5_CAP_GEN(priv->mdev, flex_parser_protocols) &
-			      MLX5_FLEX_PROTO_ICMPV6))
+			      MLX5_FLEX_PROTO_ICMPV6)) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Match on Flex protocols for ICMPV6 not supported");
 				return -EOPNOTSUPP;
+			}
 			MLX5_SET(fte_match_set_misc3, misc_c_3, icmpv6_type,
 				 match.mask->type);
 			MLX5_SET(fte_match_set_misc3, misc_v_3, icmpv6_type,
@@ -2555,15 +2565,19 @@ static int pedit_header_offsets[] = {
 #define pedit_header(_ph, _htype) ((void *)(_ph) + pedit_header_offsets[_htype])
 
 static int set_pedit_val(u8 hdr_type, u32 mask, u32 val, u32 offset,
-			 struct pedit_headers_action *hdrs)
+			 struct pedit_headers_action *hdrs,
+			 struct netlink_ext_ack *extack)
 {
 	u32 *curr_pmask, *curr_pval;
 
 	curr_pmask = (u32 *)(pedit_header(&hdrs->masks, hdr_type) + offset);
 	curr_pval  = (u32 *)(pedit_header(&hdrs->vals, hdr_type) + offset);
 
-	if (*curr_pmask & mask)  /* disallow acting twice on the same location */
+	if (*curr_pmask & mask) {  /* disallow acting twice on the same location */
+		NL_SET_ERR_MSG_MOD(extack,
+				   "curr_pmask and new mask same. Acting twice on same location");
 		goto out_err;
+	}
 
 	*curr_pmask |= mask;
 	*curr_pval  |= (val & mask);
@@ -2893,7 +2907,7 @@ parse_pedit_to_modify_hdr(struct mlx5e_priv *priv,
 	val = act->mangle.val;
 	offset = act->mangle.offset;
 
-	err = set_pedit_val(htype, ~mask, val, offset, &hdrs[cmd]);
+	err = set_pedit_val(htype, ~mask, val, offset, &hdrs[cmd], extack);
 	if (err)
 		goto out_err;
 
@@ -2913,8 +2927,10 @@ parse_pedit_to_reformat(struct mlx5e_priv *priv,
 	u32 mask, val, offset;
 	u32 *p;
 
-	if (act->id != FLOW_ACTION_MANGLE)
+	if (act->id != FLOW_ACTION_MANGLE) {
+		NL_SET_ERR_MSG_MOD(extack, "Unsupported action id");
 		return -EOPNOTSUPP;
+	}
 
 	if (act->mangle.htype != FLOW_ACT_MANGLE_HDR_TYPE_ETH) {
 		NL_SET_ERR_MSG_MOD(extack, "Only Ethernet modification is supported");
@@ -3363,12 +3379,16 @@ static int parse_tc_nic_actions(struct mlx5e_priv *priv,
 	u32 action = 0;
 	int err, i;
 
-	if (!flow_action_has_entries(flow_action))
+	if (!flow_action_has_entries(flow_action)) {
+		NL_SET_ERR_MSG_MOD(extack, "Flow Action doesn't have any entries");
 		return -EINVAL;
+	}
 
 	if (!flow_action_hw_stats_check(flow_action, extack,
-					FLOW_ACTION_HW_STATS_DELAYED_BIT))
+					FLOW_ACTION_HW_STATS_DELAYED_BIT)) {
+		NL_SET_ERR_MSG_MOD(extack, "Flow Action HW stats check not supported");
 		return -EOPNOTSUPP;
+	}
 
 	nic_attr = attr->nic_attr;
 
@@ -3409,7 +3429,8 @@ static int parse_tc_nic_actions(struct mlx5e_priv *priv,
 						   act->csum_flags,
 						   extack))
 				break;
-
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Flow Action CSUM offload not supported in NIC actions");
 			return -EOPNOTSUPP;
 		case FLOW_ACTION_REDIRECT: {
 			struct net_device *peer_dev = act->dev;
@@ -3459,7 +3480,8 @@ static int parse_tc_nic_actions(struct mlx5e_priv *priv,
 			flow_flag_set(flow, CT);
 			break;
 		default:
-			NL_SET_ERR_MSG_MOD(extack, "The offload action is not supported");
+			NL_SET_ERR_MSG_MOD(extack,
+					   "The offload action is not supported in NIC actions");
 			return -EOPNOTSUPP;
 		}
 	}
@@ -3492,8 +3514,11 @@ static int parse_tc_nic_actions(struct mlx5e_priv *priv,
 	if (attr->action & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR)
 		attr->action |= MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
 
-	if (!actions_match_supported(priv, flow_action, parse_attr, flow, extack))
+	if (!actions_match_supported(priv, flow_action, parse_attr, flow, extack)) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Action Match not supported for the flow in NIC actions");
 		return -EOPNOTSUPP;
+	}
 
 	return 0;
 }
@@ -3514,19 +3539,25 @@ static bool is_merged_eswitch_vfs(struct mlx5e_priv *priv,
 static int parse_tc_vlan_action(struct mlx5e_priv *priv,
 				const struct flow_action_entry *act,
 				struct mlx5_esw_flow_attr *attr,
-				u32 *action)
+				u32 *action,
+				struct netlink_ext_ack *extack)
 {
 	u8 vlan_idx = attr->total_vlan;
 
-	if (vlan_idx >= MLX5_FS_VLAN_DEPTH)
+	if (vlan_idx >= MLX5_FS_VLAN_DEPTH) {
+		NL_SET_ERR_MSG_MOD(extack, "VLAN IDs greater than supported");
 		return -EOPNOTSUPP;
+	}
 
 	switch (act->id) {
 	case FLOW_ACTION_VLAN_POP:
 		if (vlan_idx) {
 			if (!mlx5_eswitch_vlan_actions_supported(priv->mdev,
-								 MLX5_FS_VLAN_DEPTH))
+								 MLX5_FS_VLAN_DEPTH)) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "ESWITCH VLAN POP action requested is not supported");
 				return -EOPNOTSUPP;
+			}
 
 			*action |= MLX5_FLOW_CONTEXT_ACTION_VLAN_POP_2;
 		} else {
@@ -3542,20 +3573,27 @@ static int parse_tc_vlan_action(struct mlx5e_priv *priv,
 
 		if (vlan_idx) {
 			if (!mlx5_eswitch_vlan_actions_supported(priv->mdev,
-								 MLX5_FS_VLAN_DEPTH))
+								 MLX5_FS_VLAN_DEPTH)) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "ESWITCH VLAN PUSH action requested is not supported");
 				return -EOPNOTSUPP;
+			}
 
 			*action |= MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH_2;
 		} else {
 			if (!mlx5_eswitch_vlan_actions_supported(priv->mdev, 1) &&
 			    (act->vlan.proto != htons(ETH_P_8021Q) ||
-			     act->vlan.prio))
+			     act->vlan.prio)) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "ESWITCH VLAN PUSH act for vlan proto requested is not supported");
 				return -EOPNOTSUPP;
+			}
 
 			*action |= MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH;
 		}
 		break;
 	default:
+		NL_SET_ERR_MSG_MOD(extack, "Unexpected action id for VLAN");
 		return -EINVAL;
 	}
 
@@ -3589,7 +3627,8 @@ static struct net_device *get_fdb_out_dev(struct net_device *uplink_dev,
 static int add_vlan_push_action(struct mlx5e_priv *priv,
 				struct mlx5_flow_attr *attr,
 				struct net_device **out_dev,
-				u32 *action)
+				u32 *action,
+				struct netlink_ext_ack *extack)
 {
 	struct net_device *vlan_dev = *out_dev;
 	struct flow_action_entry vlan_act = {
@@ -3600,7 +3639,7 @@ static int add_vlan_push_action(struct mlx5e_priv *priv,
 	};
 	int err;
 
-	err = parse_tc_vlan_action(priv, &vlan_act, attr->esw_attr, action);
+	err = parse_tc_vlan_action(priv, &vlan_act, attr->esw_attr, action, extack);
 	if (err)
 		return err;
 
@@ -3611,14 +3650,15 @@ static int add_vlan_push_action(struct mlx5e_priv *priv,
 		return -ENODEV;
 
 	if (is_vlan_dev(*out_dev))
-		err = add_vlan_push_action(priv, attr, out_dev, action);
+		err = add_vlan_push_action(priv, attr, out_dev, action, extack);
 
 	return err;
 }
 
 static int add_vlan_pop_action(struct mlx5e_priv *priv,
 			       struct mlx5_flow_attr *attr,
-			       u32 *action)
+			       u32 *action,
+			       struct netlink_ext_ack *extack)
 {
 	struct flow_action_entry vlan_act = {
 		.id = FLOW_ACTION_VLAN_POP,
@@ -3628,7 +3668,7 @@ static int add_vlan_pop_action(struct mlx5e_priv *priv,
 	nest_level = attr->parse_attr->filter_dev->lower_level -
 						priv->netdev->lower_level;
 	while (nest_level--) {
-		err = parse_tc_vlan_action(priv, &vlan_act, attr->esw_attr, action);
+		err = parse_tc_vlan_action(priv, &vlan_act, attr->esw_attr, action, extack);
 		if (err)
 			return err;
 	}
@@ -3751,12 +3791,16 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
 	int err, i, if_count = 0;
 	bool mpls_push = false;
 
-	if (!flow_action_has_entries(flow_action))
+	if (!flow_action_has_entries(flow_action)) {
+		NL_SET_ERR_MSG_MOD(extack, "Flow action doesn't have any entries");
 		return -EINVAL;
+	}
 
 	if (!flow_action_hw_stats_check(flow_action, extack,
-					FLOW_ACTION_HW_STATS_DELAYED_BIT))
+					FLOW_ACTION_HW_STATS_DELAYED_BIT)) {
+		NL_SET_ERR_MSG_MOD(extack, "Flow Action HW stats check is not supported");
 		return -EOPNOTSUPP;
+	}
 
 	esw_attr = attr->esw_attr;
 	parse_attr = attr->parse_attr;
@@ -3824,7 +3868,8 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
 			if (csum_offload_supported(priv, action,
 						   act->csum_flags, extack))
 				break;
-
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Flow Action CSUM Offload not supported in FDB action");
 			return -EOPNOTSUPP;
 		case FLOW_ACTION_REDIRECT:
 		case FLOW_ACTION_MIRRED: {
@@ -3887,8 +3932,11 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
 								out_dev,
 								ifindexes,
 								if_count,
-								extack))
+								extack)) {
+					NL_SET_ERR_MSG_MOD(extack,
+							   "Duplicated output device not supported");
 					return -EOPNOTSUPP;
+				}
 
 				ifindexes[if_count] = out_dev->ifindex;
 				if_count++;
@@ -3900,14 +3948,14 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
 				if (is_vlan_dev(out_dev)) {
 					err = add_vlan_push_action(priv, attr,
 								   &out_dev,
-								   &action);
+								   &action, extack);
 					if (err)
 						return err;
 				}
 
 				if (is_vlan_dev(parse_attr->filter_dev)) {
 					err = add_vlan_pop_action(priv, attr,
-								  &action);
+								  &action, extack);
 					if (err)
 						return err;
 				}
@@ -3953,10 +4001,12 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
 			break;
 		case FLOW_ACTION_TUNNEL_ENCAP:
 			info = act->tunnel;
-			if (info)
+			if (info) {
 				encap = true;
-			else
+			} else {
+				NL_SET_ERR_MSG_MOD(extack, "Non-zero tunnel value not set");
 				return -EOPNOTSUPP;
+			}
 
 			break;
 		case FLOW_ACTION_VLAN_PUSH:
@@ -3970,7 +4020,7 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
 							      act, parse_attr, hdrs,
 							      &action, extack);
 			} else {
-				err = parse_tc_vlan_action(priv, act, esw_attr, &action);
+				err = parse_tc_vlan_action(priv, act, esw_attr, &action, extack);
 			}
 			if (err)
 				return err;
@@ -4023,7 +4073,8 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
 			flow_flag_set(flow, SAMPLE);
 			break;
 		default:
-			NL_SET_ERR_MSG_MOD(extack, "The offload action is not supported");
+			NL_SET_ERR_MSG_MOD(extack,
+					   "The offload action is not supported in FDB action");
 			return -EOPNOTSUPP;
 		}
 	}
@@ -4731,8 +4782,10 @@ static int scan_tc_matchall_fdb_actions(struct mlx5e_priv *priv,
 		return -EOPNOTSUPP;
 	}
 
-	if (!flow_action_basic_hw_stats_check(flow_action, extack))
+	if (!flow_action_basic_hw_stats_check(flow_action, extack)) {
+		NL_SET_ERR_MSG_MOD(extack, "Flow Action HW stats check is not supported");
 		return -EOPNOTSUPP;
+	}
 
 	flow_action_for_each(i, act, flow_action) {
 		switch (act->id) {
-- 
2.27.0


             reply	other threads:[~2021-08-26 11:03 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-26 11:02 Abhiram R N [this message]
2021-08-29 11:55 ` Roi Dayan
2021-08-31  8:44   ` [PATCH v2] " Abhiram R N
2021-09-05 13:39     ` Roi Dayan
2021-09-06  9:29       ` Abhiram R N
2021-09-14 10:06       ` [PATCH net-next v3] " Abhiram R N
2021-09-14 11:50       ` [PATCH net-next v4] " Abhiram R N
2021-09-19  7:26         ` Roi Dayan
2021-09-19  7:40         ` Roi Dayan
2021-09-19 19:16           ` [PATCH net-next v5] " Abhiram R N
2021-09-22  6:02             ` Roi Dayan
2021-09-22  6:30               ` [PATCH net-next v6] " Abhiram R N
2021-09-22  7:23                 ` Roi Dayan

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