Re: [PATCH net-next] cxgb4: flower: use NL_SET_ERR_MSG_MOD for validation errors

From: Jacob Keller
Date: Tue Apr 09 2024 - 20:11:34 EST



On 4/8/2024 9:55 AM, Asbjørn Sloth Tønnesen wrote:
> Replace netdev_{warn,err} with NL_SET_ERR_MSG_{FMT_,}MOD
> to better inform the user about the problem.
>
> Only compile-tested, no access to HW.
>
> Signed-off-by: Asbjørn Sloth Tønnesen <ast@xxxxxxxxxxx>
> ---

Good improvement. Its a straightforward replacement.

Reviewed-by: Jacob Keller <jacob.e.keller@xxxxxxxxx>

> .../ethernet/chelsio/cxgb4/cxgb4_tc_flower.c | 64 +++++++++----------
> 1 file changed, 30 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c
> index 72ac4a34424b9..3a6987cafe590 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c
> +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c
> @@ -305,7 +305,7 @@ static void cxgb4_process_flow_match(struct net_device *dev,
> fs->mask.iport = ~0;
> }
>
> -static int cxgb4_validate_flow_match(struct net_device *dev,
> +static int cxgb4_validate_flow_match(struct netlink_ext_ack *extack,
> struct flow_rule *rule)
> {
> struct flow_dissector *dissector = rule->match.dissector;
> @@ -321,8 +321,9 @@ static int cxgb4_validate_flow_match(struct net_device *dev,
> BIT_ULL(FLOW_DISSECTOR_KEY_ENC_KEYID) |
> BIT_ULL(FLOW_DISSECTOR_KEY_VLAN) |
> BIT_ULL(FLOW_DISSECTOR_KEY_IP))) {
> - netdev_warn(dev, "Unsupported key used: 0x%llx\n",
> - dissector->used_keys);
> + NL_SET_ERR_MSG_FMT_MOD(extack,
> + "Unsupported key used: 0x%llx",
> + dissector->used_keys);
> return -EOPNOTSUPP;
> }
>
> @@ -339,13 +340,15 @@ static int cxgb4_validate_flow_match(struct net_device *dev,
> struct flow_match_ip match;
>
> if (eth_ip_type != ETH_P_IP && eth_ip_type != ETH_P_IPV6) {
> - netdev_err(dev, "IP Key supported only with IPv4/v6");
> + NL_SET_ERR_MSG_MOD(extack,
> + "IP Key supported only with IPv4/v6");
> return -EINVAL;
> }
>
> flow_rule_match_ip(rule, &match);
> if (match.mask->ttl) {
> - netdev_warn(dev, "ttl match unsupported for offload");
> + NL_SET_ERR_MSG_MOD(extack,
> + "ttl match unsupported for offload");
> return -EOPNOTSUPP;
> }
> }
> @@ -576,7 +579,7 @@ static bool valid_l4_mask(u32 mask)
> return hi && lo ? false : true;
> }
>
> -static bool valid_pedit_action(struct net_device *dev,
> +static bool valid_pedit_action(struct netlink_ext_ack *extack,
> const struct flow_action_entry *act,
> u8 *natmode_flags)
> {
> @@ -595,8 +598,7 @@ static bool valid_pedit_action(struct net_device *dev,
> case PEDIT_ETH_SMAC_47_16:
> break;
> default:
> - netdev_err(dev, "%s: Unsupported pedit field\n",
> - __func__);
> + NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit field");
> return false;
> }
> break;
> @@ -609,8 +611,7 @@ static bool valid_pedit_action(struct net_device *dev,
> *natmode_flags |= CXGB4_ACTION_NATMODE_DIP;
> break;
> default:
> - netdev_err(dev, "%s: Unsupported pedit field\n",
> - __func__);
> + NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit field");
> return false;
> }
> break;
> @@ -629,8 +630,7 @@ static bool valid_pedit_action(struct net_device *dev,
> *natmode_flags |= CXGB4_ACTION_NATMODE_DIP;
> break;
> default:
> - netdev_err(dev, "%s: Unsupported pedit field\n",
> - __func__);
> + NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit field");
> return false;
> }
> break;
> @@ -638,8 +638,8 @@ static bool valid_pedit_action(struct net_device *dev,
> switch (offset) {
> case PEDIT_TCP_SPORT_DPORT:
> if (!valid_l4_mask(~mask)) {
> - netdev_err(dev, "%s: Unsupported mask for TCP L4 ports\n",
> - __func__);
> + NL_SET_ERR_MSG_MOD(extack,
> + "Unsupported mask for TCP L4 ports");
> return false;
> }
> if (~mask & PEDIT_TCP_UDP_SPORT_MASK)
> @@ -648,8 +648,7 @@ static bool valid_pedit_action(struct net_device *dev,
> *natmode_flags |= CXGB4_ACTION_NATMODE_DPORT;
> break;
> default:
> - netdev_err(dev, "%s: Unsupported pedit field\n",
> - __func__);
> + NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit field");
> return false;
> }
> break;
> @@ -657,8 +656,8 @@ static bool valid_pedit_action(struct net_device *dev,
> switch (offset) {
> case PEDIT_UDP_SPORT_DPORT:
> if (!valid_l4_mask(~mask)) {
> - netdev_err(dev, "%s: Unsupported mask for UDP L4 ports\n",
> - __func__);
> + NL_SET_ERR_MSG_MOD(extack,
> + "Unsupported mask for UDP L4 ports");
> return false;
> }
> if (~mask & PEDIT_TCP_UDP_SPORT_MASK)
> @@ -667,13 +666,12 @@ static bool valid_pedit_action(struct net_device *dev,
> *natmode_flags |= CXGB4_ACTION_NATMODE_DPORT;
> break;
> default:
> - netdev_err(dev, "%s: Unsupported pedit field\n",
> - __func__);
> + NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit field");
> return false;
> }
> break;
> default:
> - netdev_err(dev, "%s: Unsupported pedit type\n", __func__);
> + NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit type");
> return false;
> }
> return true;
> @@ -727,8 +725,7 @@ int cxgb4_validate_flow_actions(struct net_device *dev,
> * the provided output port is not valid
> */
> if (!found) {
> - netdev_err(dev, "%s: Out port invalid\n",
> - __func__);
> + NL_SET_ERR_MSG_MOD(extack, "Out port invalid");
> return -EINVAL;
> }
> act_redir = true;
> @@ -745,21 +742,21 @@ int cxgb4_validate_flow_actions(struct net_device *dev,
> case FLOW_ACTION_VLAN_PUSH:
> case FLOW_ACTION_VLAN_MANGLE:
> if (proto != ETH_P_8021Q) {
> - netdev_err(dev, "%s: Unsupported vlan proto\n",
> - __func__);
> + NL_SET_ERR_MSG_MOD(extack,
> + "Unsupported vlan proto");
> return -EOPNOTSUPP;
> }
> break;
> default:
> - netdev_err(dev, "%s: Unsupported vlan action\n",
> - __func__);
> + NL_SET_ERR_MSG_MOD(extack,
> + "Unsupported vlan action");
> return -EOPNOTSUPP;
> }
> act_vlan = true;
> }
> break;
> case FLOW_ACTION_MANGLE: {
> - bool pedit_valid = valid_pedit_action(dev, act,
> + bool pedit_valid = valid_pedit_action(extack, act,
> &natmode_flags);
>
> if (!pedit_valid)
> @@ -771,14 +768,14 @@ int cxgb4_validate_flow_actions(struct net_device *dev,
> /* Do nothing. cxgb4_set_filter will validate */
> break;
> default:
> - netdev_err(dev, "%s: Unsupported action\n", __func__);
> + NL_SET_ERR_MSG_MOD(extack, "Unsupported action");
> return -EOPNOTSUPP;
> }
> }
>
> if ((act_pedit || act_vlan) && !act_redir) {
> - netdev_err(dev, "%s: pedit/vlan rewrite invalid without egress redirect\n",
> - __func__);
> + NL_SET_ERR_MSG_MOD(extack,
> + "pedit/vlan rewrite invalid without egress redirect");
> return -EINVAL;
> }
>
> @@ -864,7 +861,7 @@ int cxgb4_flow_rule_replace(struct net_device *dev, struct flow_rule *rule,
> if (cxgb4_validate_flow_actions(dev, &rule->action, extack, 0))
> return -EOPNOTSUPP;
>
> - if (cxgb4_validate_flow_match(dev, rule))
> + if (cxgb4_validate_flow_match(extack, rule))
> return -EOPNOTSUPP;
>
> cxgb4_process_flow_match(dev, rule, fs);
> @@ -901,8 +898,7 @@ int cxgb4_flow_rule_replace(struct net_device *dev, struct flow_rule *rule,
> init_completion(&ctx.completion);
> ret = __cxgb4_set_filter(dev, fidx, fs, &ctx);
> if (ret) {
> - netdev_err(dev, "%s: filter creation err %d\n",
> - __func__, ret);
> + NL_SET_ERR_MSG_FMT_MOD(extack, "filter creation err %d", ret);
> return ret;
> }
>