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Date: Thu, 9 Dec 2021 23:16:31 +0800
From: Ong Boon Leong <boon.leong.ong@...el.com>
To: Giuseppe Cavallaro <peppe.cavallaro@...com>,
Alexandre Torgue <alexandre.torgue@...com>,
Jose Abreu <joabreu@...opsys.com>,
"David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
alexandre.torgue@...s.st.com,
Kurt Kanzenbach <kurt.kanzenbach@...utronix.de>
Cc: netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
linux-arm-kernel@...ts.infradead.org,
Ong Boon Leong <boon.leong.ong@...el.com>
Subject: [PATCH net-next 2/2] net: stmmac: add tc flower filter for EtherType matching
This patch adds basic support for EtherType RX frame steering for
LLDP and PTP using the hardware offload capabilities.
Signed-off-by: Ong Boon Leong <boon.leong.ong@...el.com>
---
drivers/net/ethernet/stmicro/stmmac/stmmac.h | 3 +
.../net/ethernet/stmicro/stmmac/stmmac_tc.c | 121 ++++++++++++++++++
2 files changed, 124 insertions(+)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index 18a262ef17f..ce12b2fbd80 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -174,11 +174,14 @@ struct stmmac_flow_entry {
/* Rx Frame Steering */
enum stmmac_rfs_type {
STMMAC_RFS_T_VLAN,
+ STMMAC_RFS_T_LLDP,
+ STMMAC_RFS_T_1588,
STMMAC_RFS_T_MAX,
};
struct stmmac_rfs_entry {
unsigned long cookie;
+ __be16 etype;
int in_use;
int type;
int tc;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
index d0a2b289f46..de7ce4697a5 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
@@ -237,6 +237,8 @@ static int tc_rfs_init(struct stmmac_priv *priv)
int i;
priv->rfs_entries_max[STMMAC_RFS_T_VLAN] = 8;
+ priv->rfs_entries_max[STMMAC_RFS_T_LLDP] = 1;
+ priv->rfs_entries_max[STMMAC_RFS_T_1588] = 1;
for (i = 0; i < STMMAC_RFS_T_MAX; i++)
priv->rfs_entries_total += priv->rfs_entries_max[i];
@@ -451,6 +453,8 @@ static int tc_parse_flow_actions(struct stmmac_priv *priv,
return 0;
}
+#define ETHER_TYPE_FULL_MASK ((__force __be16)~0)
+
static int tc_add_basic_flow(struct stmmac_priv *priv,
struct flow_cls_offload *cls,
struct stmmac_flow_entry *entry)
@@ -464,6 +468,7 @@ static int tc_add_basic_flow(struct stmmac_priv *priv,
return -EINVAL;
flow_rule_match_basic(rule, &match);
+
entry->ip_proto = match.key->ip_proto;
return 0;
}
@@ -724,6 +729,114 @@ static int tc_del_vlan_flow(struct stmmac_priv *priv,
return 0;
}
+static int tc_add_ethtype_flow(struct stmmac_priv *priv,
+ struct flow_cls_offload *cls)
+{
+ struct stmmac_rfs_entry *entry = tc_find_rfs(priv, cls, false);
+ struct flow_rule *rule = flow_cls_offload_flow_rule(cls);
+ struct flow_dissector *dissector = rule->match.dissector;
+ int tc = tc_classid_to_hwtc(priv->dev, cls->classid);
+ struct flow_match_basic match;
+
+ if (!entry) {
+ entry = tc_find_rfs(priv, cls, true);
+ if (!entry)
+ return -ENOENT;
+ }
+
+ /* Nothing to do here */
+ if (!dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_BASIC))
+ return -EINVAL;
+
+ if (tc < 0) {
+ netdev_err(priv->dev, "Invalid traffic class\n");
+ return -EINVAL;
+ }
+
+ flow_rule_match_basic(rule, &match);
+
+ if (match.mask->n_proto) {
+ __be16 etype = ntohs(match.key->n_proto);
+
+ if (match.mask->n_proto != ETHER_TYPE_FULL_MASK) {
+ netdev_err(priv->dev, "Only full mask is supported for EthType filter");
+ return -EINVAL;
+ }
+ switch (etype) {
+ case ETH_P_LLDP:
+ if (priv->rfs_entries_cnt[STMMAC_RFS_T_LLDP] >=
+ priv->rfs_entries_max[STMMAC_RFS_T_LLDP])
+ return -ENOENT;
+
+ entry->type = STMMAC_RFS_T_LLDP;
+ priv->rfs_entries_cnt[STMMAC_RFS_T_LLDP]++;
+
+ stmmac_rx_queue_routing(priv, priv->hw,
+ PACKET_DCBCPQ, tc);
+ break;
+ case ETH_P_1588:
+ if (priv->rfs_entries_cnt[STMMAC_RFS_T_1588] >=
+ priv->rfs_entries_max[STMMAC_RFS_T_1588])
+ return -ENOENT;
+
+ entry->type = STMMAC_RFS_T_1588;
+ priv->rfs_entries_cnt[STMMAC_RFS_T_1588]++;
+
+ stmmac_rx_queue_routing(priv, priv->hw,
+ PACKET_PTPQ, tc);
+ break;
+ default:
+ netdev_err(priv->dev, "EthType(0x%x) is not supported", etype);
+ return -EINVAL;
+ }
+
+ entry->in_use = true;
+ entry->cookie = cls->cookie;
+ entry->tc = tc;
+ entry->etype = etype;
+
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static int tc_del_ethtype_flow(struct stmmac_priv *priv,
+ struct flow_cls_offload *cls)
+{
+ struct stmmac_rfs_entry *entry = tc_find_rfs(priv, cls, false);
+
+ if (!entry || !entry->in_use ||
+ entry->type < STMMAC_RFS_T_LLDP ||
+ entry->type > STMMAC_RFS_T_1588)
+ return -ENOENT;
+
+ switch (entry->etype) {
+ case ETH_P_LLDP:
+ stmmac_rx_queue_routing(priv, priv->hw,
+ PACKET_DCBCPQ, 0);
+ priv->rfs_entries_cnt[STMMAC_RFS_T_LLDP]--;
+ break;
+ case ETH_P_1588:
+ stmmac_rx_queue_routing(priv, priv->hw,
+ PACKET_PTPQ, 0);
+ priv->rfs_entries_cnt[STMMAC_RFS_T_1588]--;
+ break;
+ default:
+ netdev_err(priv->dev, "EthType(0x%x) is not supported",
+ entry->etype);
+ return -EINVAL;
+ }
+
+ entry->in_use = false;
+ entry->cookie = 0;
+ entry->tc = 0;
+ entry->etype = 0;
+ entry->type = 0;
+
+ return 0;
+}
+
static int tc_add_flow_cls(struct stmmac_priv *priv,
struct flow_cls_offload *cls)
{
@@ -733,6 +846,10 @@ static int tc_add_flow_cls(struct stmmac_priv *priv,
if (!ret)
return ret;
+ ret = tc_add_ethtype_flow(priv, cls);
+ if (!ret)
+ return ret;
+
return tc_add_vlan_flow(priv, cls);
}
@@ -745,6 +862,10 @@ static int tc_del_flow_cls(struct stmmac_priv *priv,
if (!ret)
return ret;
+ ret = tc_del_ethtype_flow(priv, cls);
+ if (!ret)
+ return ret;
+
return tc_del_vlan_flow(priv, cls);
}
--
2.25.1
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