[PATCH 04/10] net/mlx5: support destroying unicast flow rules

[Dariusz Sosnowski]

This patch adds support for destroying:

- unicast DMAC control flow rules and
- unicast DMAC with VLAN control flow rules,

without affecting any other control flow rules,
when HWS flow engine is used.

Signed-off-by: Dariusz Sosnowski <dsosnowski at nvidia.com>
---
 drivers/net/mlx5/mlx5_flow.h          |  8 +++
 drivers/net/mlx5/mlx5_flow_hw.c       | 72 +++++++++++++++++++++++++++
 drivers/net/mlx5/mlx5_flow_hw_stubs.c | 27 ++++++++++
 3 files changed, 107 insertions(+)

diff --git a/drivers/net/mlx5/mlx5_flow.h b/drivers/net/mlx5/mlx5_flow.h
index 2ff0b25d4d..165d17e40a 100644
--- a/drivers/net/mlx5/mlx5_flow.h
+++ b/drivers/net/mlx5/mlx5_flow.h
@@ -2994,11 +2994,19 @@ int mlx5_flow_hw_ctrl_flows(struct rte_eth_dev *dev, uint32_t flags);
 /** Create a control flow rule for matching unicast DMAC (HWS). */
 int mlx5_flow_hw_ctrl_flow_dmac(struct rte_eth_dev *dev, const struct rte_ether_addr *addr);
 
+/** Destroy a control flow rule for matching unicast DMAC (HWS). */
+int mlx5_flow_hw_ctrl_flow_dmac_destroy(struct rte_eth_dev *dev, const struct rte_ether_addr *addr);
+
 /** Create a control flow rule for matching unicast DMAC with VLAN (HWS). */
 int mlx5_flow_hw_ctrl_flow_dmac_vlan(struct rte_eth_dev *dev,
 				     const struct rte_ether_addr *addr,
 				     const uint16_t vlan);
 
+/** Destroy a control flow rule for matching unicast DMAC with VLAN (HWS). */
+int mlx5_flow_hw_ctrl_flow_dmac_vlan_destroy(struct rte_eth_dev *dev,
+					     const struct rte_ether_addr *addr,
+					     const uint16_t vlan);
+
 void mlx5_flow_hw_cleanup_ctrl_rx_templates(struct rte_eth_dev *dev);
 
 int mlx5_flow_group_to_table(struct rte_eth_dev *dev,
diff --git a/drivers/net/mlx5/mlx5_flow_hw.c b/drivers/net/mlx5/mlx5_flow_hw.c
index afc9778b97..35e9eead7e 100644
--- a/drivers/net/mlx5/mlx5_flow_hw.c
+++ b/drivers/net/mlx5/mlx5_flow_hw.c
@@ -16211,6 +16211,41 @@ mlx5_flow_hw_ctrl_flow_dmac(struct rte_eth_dev *dev,
 					     addr, 0);
 }
 
+int
+mlx5_flow_hw_ctrl_flow_dmac_destroy(struct rte_eth_dev *dev,
+				    const struct rte_ether_addr *addr)
+{
+	struct mlx5_priv *priv = dev->data->dev_private;
+	struct mlx5_hw_ctrl_flow *entry;
+	struct mlx5_hw_ctrl_flow *tmp;
+	int ret;
+
+	/*
+	 * HWS does not have automatic RSS flow expansion,
+	 * so each variant of the control flow rule is a separate entry in the list.
+	 * In that case, the whole list must be traversed.
+	 */
+	entry = LIST_FIRST(&priv->hw_ctrl_flows);
+	while (entry != NULL) {
+		tmp = LIST_NEXT(entry, next);
+
+		if (entry->info.type != MLX5_HW_CTRL_FLOW_TYPE_DEFAULT_RX_RSS_UNICAST_DMAC ||
+		    !rte_is_same_ether_addr(addr, &entry->info.uc.dmac)) {
+			entry = tmp;
+			continue;
+		}
+
+		ret = flow_hw_destroy_ctrl_flow(dev, entry->flow);
+		LIST_REMOVE(entry, next);
+		mlx5_free(entry);
+		if (ret)
+			return ret;
+
+		entry = tmp;
+	}
+	return 0;
+}
+
 int
 mlx5_flow_hw_ctrl_flow_dmac_vlan(struct rte_eth_dev *dev,
 				 const struct rte_ether_addr *addr,
@@ -16220,6 +16255,43 @@ mlx5_flow_hw_ctrl_flow_dmac_vlan(struct rte_eth_dev *dev,
 					     addr, vlan);
 }
 
+int
+mlx5_flow_hw_ctrl_flow_dmac_vlan_destroy(struct rte_eth_dev *dev,
+					 const struct rte_ether_addr *addr,
+					 const uint16_t vlan)
+{
+	struct mlx5_priv *priv = dev->data->dev_private;
+	struct mlx5_hw_ctrl_flow *entry;
+	struct mlx5_hw_ctrl_flow *tmp;
+	int ret;
+
+	/*
+	 * HWS does not have automatic RSS flow expansion,
+	 * so each variant of the control flow rule is a separate entry in the list.
+	 * In that case, the whole list must be traversed.
+	 */
+	entry = LIST_FIRST(&priv->hw_ctrl_flows);
+	while (entry != NULL) {
+		tmp = LIST_NEXT(entry, next);
+
+		if (entry->info.type != MLX5_HW_CTRL_FLOW_TYPE_DEFAULT_RX_RSS_UNICAST_DMAC_VLAN ||
+		    !rte_is_same_ether_addr(addr, &entry->info.uc.dmac) ||
+		    vlan != entry->info.uc.vlan) {
+			entry = tmp;
+			continue;
+		}
+
+		ret = flow_hw_destroy_ctrl_flow(dev, entry->flow);
+		LIST_REMOVE(entry, next);
+		mlx5_free(entry);
+		if (ret)
+			return ret;
+
+		entry = tmp;
+	}
+	return 0;
+}
+
 static __rte_always_inline uint32_t
 mlx5_reformat_domain_to_tbl_type(const struct rte_flow_indir_action_conf *domain)
 {
diff --git a/drivers/net/mlx5/mlx5_flow_hw_stubs.c b/drivers/net/mlx5/mlx5_flow_hw_stubs.c
index 985c046056..0e79e6c1f2 100644
--- a/drivers/net/mlx5/mlx5_flow_hw_stubs.c
+++ b/drivers/net/mlx5/mlx5_flow_hw_stubs.c
@@ -26,6 +26,19 @@ mlx5_flow_hw_ctrl_flow_dmac(struct rte_eth_dev *dev __rte_unused,
 	return -rte_errno;
 }
 
+/*
+ * This is a stub for the real implementation of this function in mlx5_flow_hw.c in case:
+ * - PMD is compiled on Windows or
+ * - available rdma-core does not support HWS.
+ */
+__rte_weak int
+mlx5_flow_hw_ctrl_flow_dmac_destroy(struct rte_eth_dev *dev __rte_unused,
+				    const struct rte_ether_addr *addr __rte_unused)
+{
+	rte_errno = ENOTSUP;
+	return -rte_errno;
+}
+
 /*
  * This is a stub for the real implementation of this function in mlx5_flow_hw.c in case:
  * - PMD is compiled on Windows or
@@ -39,3 +52,17 @@ mlx5_flow_hw_ctrl_flow_dmac_vlan(struct rte_eth_dev *dev __rte_unused,
 	rte_errno = ENOTSUP;
 	return -rte_errno;
 }
+
+/*
+ * This is a stub for the real implementation of this function in mlx5_flow_hw.c in case:
+ * - PMD is compiled on Windows or
+ * - available rdma-core does not support HWS.
+ */
+__rte_weak int
+mlx5_flow_hw_ctrl_flow_dmac_vlan_destroy(struct rte_eth_dev *dev __rte_unused,
+					 const struct rte_ether_addr *addr __rte_unused,
+					 const uint16_t vlan __rte_unused)
+{
+	rte_errno = ENOTSUP;
+	return -rte_errno;
+}
-- 
2.39.5