[Intel-wired-lan] [PATCH 08/19] igc: Refactor igc_ethtool_add_nfc_rule()
Andre Guedes
andre.guedes at intel.com
Fri Apr 24 20:16:12 UTC 2020
Current implementation of igc_ethtool_add_nfc_rule() is quite long and a
bit convoluted so this patch does a code refactoring to improve the
code.
Code related to NFC rule object initialization is refactored out to the
local helper function igc_ethtool_init_nfc_rule(). Likewise, code
related to NFC rule validation is refactored out to another local
helper, igc_ethtool_is_nfc_rule_valid().
RX_CLS_FLOW_DISC check is removed since it is redundant. The macro is
defined as the max value fsp->ring_cookie can have, so checking if
fsp->ring_cookie >= adapter->num_rx_queues is already sufficient.
Finally, some log messages are improved or added, and obvious comments
are removed.
Signed-off-by: Andre Guedes <andre.guedes at intel.com>
---
drivers/net/ethernet/intel/igc/igc_ethtool.c | 150 ++++++++++++-------
1 file changed, 92 insertions(+), 58 deletions(-)
diff --git a/drivers/net/ethernet/intel/igc/igc_ethtool.c b/drivers/net/ethernet/intel/igc/igc_ethtool.c
index f9518aa1375b..bdb7c99f66be 100644
--- a/drivers/net/ethernet/intel/igc/igc_ethtool.c
+++ b/drivers/net/ethernet/intel/igc/igc_ethtool.c
@@ -1271,9 +1271,6 @@ static int igc_ethtool_update_nfc_rule(struct igc_adapter *adapter,
if (!input)
return err;
- /* initialize node */
- INIT_HLIST_NODE(&input->nfc_node);
-
/* add filter to the list */
if (parent)
hlist_add_behind(&input->nfc_node, &parent->nfc_node);
@@ -1286,41 +1283,19 @@ static int igc_ethtool_update_nfc_rule(struct igc_adapter *adapter,
return 0;
}
-static int igc_ethtool_add_nfc_rule(struct igc_adapter *adapter,
- struct ethtool_rxnfc *cmd)
+static void igc_ethtool_init_nfc_rule(struct igc_nfc_rule *rule,
+ const struct ethtool_rx_flow_spec *fsp)
{
- struct net_device *netdev = adapter->netdev;
- struct ethtool_rx_flow_spec *fsp =
- (struct ethtool_rx_flow_spec *)&cmd->fs;
- struct igc_nfc_rule *rule, *tmp;
- int err = 0;
-
- if (!(netdev->hw_features & NETIF_F_NTUPLE))
- return -EOPNOTSUPP;
+ INIT_HLIST_NODE(&rule->nfc_node);
- /* Don't allow programming if the action is a queue greater than
- * the number of online Rx queues.
- */
- if (fsp->ring_cookie == RX_CLS_FLOW_DISC ||
- fsp->ring_cookie >= adapter->num_rx_queues) {
- netdev_err(netdev,
- "ethtool -N: The specified action is invalid");
- return -EINVAL;
- }
+ rule->action = fsp->ring_cookie;
+ rule->sw_idx = fsp->location;
- /* Don't allow indexes to exist outside of available space */
- if (fsp->location >= IGC_MAX_RXNFC_RULES) {
- netdev_err(netdev, "Location out of range");
- return -EINVAL;
+ if ((fsp->flow_type & FLOW_EXT) && fsp->m_ext.vlan_tci) {
+ rule->filter.vlan_tci = ntohs(fsp->h_ext.vlan_tci);
+ rule->filter.match_flags |= IGC_FILTER_FLAG_VLAN_TCI;
}
- if ((fsp->flow_type & ~FLOW_EXT) != ETHER_FLOW)
- return -EINVAL;
-
- rule = kzalloc(sizeof(*rule), GFP_KERNEL);
- if (!rule)
- return -ENOMEM;
-
if (fsp->m_u.ether_spec.h_proto == ETHER_TYPE_FULL_MASK) {
rule->filter.etype = ntohs(fsp->h_u.ether_spec.h_proto);
rule->filter.match_flags = IGC_FILTER_FLAG_ETHER_TYPE;
@@ -1340,51 +1315,110 @@ static int igc_ethtool_add_nfc_rule(struct igc_adapter *adapter,
ether_addr_copy(rule->filter.dst_addr,
fsp->h_u.ether_spec.h_dest);
}
+}
- if (rule->filter.match_flags & IGC_FILTER_FLAG_DST_MAC_ADDR &&
- rule->filter.match_flags & IGC_FILTER_FLAG_SRC_MAC_ADDR) {
- netdev_dbg(netdev, "Filters with both dst and src are not supported");
- err = -EOPNOTSUPP;
- goto err_out;
- }
+/**
+ * igc_ethtool_check_nfc_rule() - Check if NFC rule is valid.
+ * @adapter: Pointer to adapter.
+ * @rule: Rule under evaluation.
+ *
+ * Rules with both destination and source MAC addresses are considered invalid
+ * since the driver doesn't support them.
+ *
+ * Also, if there is already another rule with the same filter, @rule is
+ * considered invalid.
+ *
+ * Context: Expects adapter->nfc_rule_lock to be held by caller.
+ *
+ * Return: 0 in case of success, negative errno code otherwise.
+ */
+static int igc_ethtool_check_nfc_rule(struct igc_adapter *adapter,
+ struct igc_nfc_rule *rule)
+{
+ struct net_device *dev = adapter->netdev;
+ u8 flags = rule->filter.match_flags;
+ struct igc_nfc_rule *tmp;
- if ((fsp->flow_type & FLOW_EXT) && fsp->m_ext.vlan_tci) {
- if (fsp->m_ext.vlan_tci != htons(VLAN_PRIO_MASK)) {
- netdev_dbg(netdev, "VLAN mask not supported");
- err = -EOPNOTSUPP;
- goto err_out;
- }
- rule->filter.vlan_tci = ntohs(fsp->h_ext.vlan_tci);
- rule->filter.match_flags |= IGC_FILTER_FLAG_VLAN_TCI;
+ if (!flags) {
+ netdev_dbg(dev, "Rule with no match");
+ return -EINVAL;
}
- rule->action = fsp->ring_cookie;
- rule->sw_idx = fsp->location;
-
- spin_lock(&adapter->nfc_rule_lock);
+ if (flags & IGC_FILTER_FLAG_DST_MAC_ADDR &&
+ flags & IGC_FILTER_FLAG_SRC_MAC_ADDR) {
+ netdev_dbg(dev, "Filters with both dst and src are not supported");
+ return -EOPNOTSUPP;
+ }
hlist_for_each_entry(tmp, &adapter->nfc_rule_list, nfc_node) {
if (!memcmp(&rule->filter, &tmp->filter,
sizeof(rule->filter))) {
- err = -EEXIST;
- netdev_err(netdev,
- "ethtool: this filter is already set");
- goto err_out_w_lock;
+ netdev_dbg(dev, "Rule already exists");
+ return -EEXIST;
}
}
+ return 0;
+}
+
+static int igc_ethtool_add_nfc_rule(struct igc_adapter *adapter,
+ struct ethtool_rxnfc *cmd)
+{
+ struct net_device *netdev = adapter->netdev;
+ struct ethtool_rx_flow_spec *fsp =
+ (struct ethtool_rx_flow_spec *)&cmd->fs;
+ struct igc_nfc_rule *rule;
+ int err;
+
+ if (!(netdev->hw_features & NETIF_F_NTUPLE)) {
+ netdev_dbg(netdev, "N-tuple filters disabled");
+ return -EOPNOTSUPP;
+ }
+
+ if ((fsp->flow_type & ~FLOW_EXT) != ETHER_FLOW) {
+ netdev_dbg(netdev, "Only ethernet flow type is supported");
+ return -EOPNOTSUPP;
+ }
+
+ if ((fsp->flow_type & FLOW_EXT) &&
+ fsp->m_ext.vlan_tci != htons(VLAN_PRIO_MASK)) {
+ netdev_dbg(netdev, "VLAN mask not supported");
+ return -EOPNOTSUPP;
+ }
+
+ if (fsp->ring_cookie >= adapter->num_rx_queues) {
+ netdev_dbg(netdev, "Invalid action");
+ return -EINVAL;
+ }
+
+ if (fsp->location >= IGC_MAX_RXNFC_RULES) {
+ netdev_dbg(netdev, "Invalid location");
+ return -EINVAL;
+ }
+
+ rule = kzalloc(sizeof(*rule), GFP_KERNEL);
+ if (!rule)
+ return -ENOMEM;
+
+ igc_ethtool_init_nfc_rule(rule, fsp);
+
+ spin_lock(&adapter->nfc_rule_lock);
+
+ err = igc_ethtool_check_nfc_rule(adapter, rule);
+ if (err)
+ goto err;
+
err = igc_enable_nfc_rule(adapter, rule);
if (err)
- goto err_out_w_lock;
+ goto err;
igc_ethtool_update_nfc_rule(adapter, rule, rule->sw_idx);
spin_unlock(&adapter->nfc_rule_lock);
return 0;
-err_out_w_lock:
+err:
spin_unlock(&adapter->nfc_rule_lock);
-err_out:
kfree(rule);
return err;
}
--
2.26.0
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