[dpdk-dev] [PATCH v2 2/7] lib/librte_ether: support l2 tunnel config

[Wenzhuo Lu]

Add functions to support l2 tunnel configuration.
The support includes ether type modification and the tunnel support
enabling/disabling.
Ether type modification means modifying the ether type of a specific
type of tunnel. So the packet with this ether type will be parsed as
this type of tunnel.
Enabling/disabling a tunnel support means enabling/disabling the
ability of parsing the specific type of tunnel. This ability should
be enabled before we enable filtering, forwarding, offloading for
this specific type of tunnel.
Only support e-tag tunnel now.

E-tag introduction,
E-tag means external tag which is defined in IEEEE 802.1BR
specification.
E-tag is a kind of l2 tunnel. It means a tag will be inserted in the
l2 header. Like below,
   |31            24|23           16|15         8|7           0|
  0|                   Destination MAC address                 |
  4|     Dest MAC address(cont.)    |     Src MAC address      |
  8|                  Source MAC address(cont.)                |
 12| E-tag Etherenet type (0x893f)  |      E-tag header        |
 16|                    E-tag header(cont.)                    |
 20|   VLAN Ethertype(optional)     |   VLAN header(optional)  |
 24|         Original type          |         ......           |
...|                              ......                       |
The E-tag format is like below,
   |0                    15|16   18|19 |20                   31|
   |   Ethertype - 0x893f  | E-PCP |DEI|   Ingress E-CID_base  |

   |32  33|34 35|36      47|48         55    |56             63|
   |  RSV | GRP |E-CID_base|Ingress_E-CID_ext|    E-CID_ext    |

The Ingess_E-CID_ext and E-CID_ext are always zero for endpoints
and are effectively reserved.

The more details of E-tag is in IEEE 802.1BR. 802.1BR is used to
replace 802.1Qbh. 802.1BR is a standard for Bridge Port Extension.
It specifies the operation of Bridge Port Extenders, including
management, protocols, and algorithms. Bridge Port Extenders
operate in support of the MAC Service by Extended Bridges.
The E-tag is added to l2 header to identify the VM channel and
the virtual port.

Signed-off-by: Wenzhuo Lu <wenzhuo.lu at intel.com>
---
 lib/librte_ether/rte_eth_ctrl.h |  9 +++++
 lib/librte_ether/rte_ethdev.c   | 61 ++++++++++++++++++++++++++++++
 lib/librte_ether/rte_ethdev.h   | 84 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 154 insertions(+)

diff --git a/lib/librte_ether/rte_eth_ctrl.h b/lib/librte_ether/rte_eth_ctrl.h
index ce224ad..09af6fb 100644
--- a/lib/librte_ether/rte_eth_ctrl.h
+++ b/lib/librte_ether/rte_eth_ctrl.h
@@ -804,6 +804,15 @@ struct rte_eth_hash_filter_info {
 	} info;
 };
 
+/**
+ * l2 tunnel type.
+ */
+enum rte_eth_l2_tunnel_type {
+	RTE_L2_TUNNEL_TYPE_NONE = 0,
+	RTE_L2_TUNNEL_TYPE_E_TAG,
+	RTE_L2_TUNNEL_TYPE_MAX,
+};
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index ed971b4..1b90e09 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -3239,3 +3239,64 @@ rte_eth_copy_pci_info(struct rte_eth_dev *eth_dev, struct rte_pci_device *pci_de
 	eth_dev->data->numa_node = pci_dev->numa_node;
 	eth_dev->data->drv_name = pci_dev->driver->name;
 }
+
+int
+rte_eth_dev_l2_tunnel_eth_type_conf(uint8_t port_id,
+				    struct rte_eth_l2_tunnel *l2_tunnel)
+{
+	struct rte_eth_dev *dev;
+
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+	if (l2_tunnel == NULL) {
+		RTE_PMD_DEBUG_TRACE("Invalid l2_tunnel parameter\n");
+		return -EINVAL;
+	}
+
+	if (l2_tunnel->l2_tunnel_type >= RTE_L2_TUNNEL_TYPE_MAX) {
+		RTE_PMD_DEBUG_TRACE("Invalid l2 tunnel type\n");
+		return -EINVAL;
+	}
+
+	dev = &rte_eth_devices[port_id];
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->l2_tunnel_eth_type_conf,
+				-ENOTSUP);
+	return (*dev->dev_ops->l2_tunnel_eth_type_conf)(dev, l2_tunnel);
+}
+
+int
+rte_eth_dev_l2_tunnel_enable(uint8_t port_id,
+			     enum rte_eth_l2_tunnel_type l2_tunnel_type)
+{
+	struct rte_eth_dev *dev;
+
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+
+	if (l2_tunnel_type >= RTE_L2_TUNNEL_TYPE_MAX) {
+		RTE_PMD_DEBUG_TRACE("Invalid l2 tunnel type\n");
+		return -EINVAL;
+	}
+
+	dev = &rte_eth_devices[port_id];
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->l2_tunnel_enable,
+				-ENOTSUP);
+	return (*dev->dev_ops->l2_tunnel_enable)(dev, l2_tunnel_type);
+}
+
+int
+rte_eth_dev_l2_tunnel_disable(uint8_t port_id,
+			      enum rte_eth_l2_tunnel_type l2_tunnel_type)
+{
+	struct rte_eth_dev *dev;
+
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+
+	if (l2_tunnel_type >= RTE_L2_TUNNEL_TYPE_MAX) {
+		RTE_PMD_DEBUG_TRACE("Invalid l2 tunnel type\n");
+		return -EINVAL;
+	}
+
+	dev = &rte_eth_devices[port_id];
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->l2_tunnel_disable,
+				-ENOTSUP);
+	return (*dev->dev_ops->l2_tunnel_disable)(dev, l2_tunnel_type);
+}
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index bada8ad..9b594b8 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -957,6 +957,14 @@ TAILQ_HEAD(rte_eth_dev_cb_list, rte_eth_dev_callback);
 	} \
 } while (0)
 
+/**
+ * l2 tunnel configuration.
+ */
+struct rte_eth_l2_tunnel {
+	enum rte_eth_l2_tunnel_type l2_tunnel_type;
+	uint16_t ether_type;
+};
+
 /*
  * Definitions of all functions exported by an Ethernet driver through the
  * the generic structure of type *eth_dev_ops* supplied in the *rte_eth_dev*
@@ -1261,6 +1269,20 @@ typedef int (*eth_set_eeprom_t)(struct rte_eth_dev *dev,
 				struct rte_dev_eeprom_info *info);
 /**< @internal Program eeprom data  */
 
+typedef int (*eth_l2_tunnel_eth_type_conf_t)
+	(struct rte_eth_dev *dev, struct rte_eth_l2_tunnel *l2_tunnel);
+/**< @internal config l2 tunnel ether type */
+
+typedef int (*eth_l2_tunnel_enable_t)
+	(struct rte_eth_dev *dev,
+	 enum rte_eth_l2_tunnel_type l2_tunnel_type);
+/**< @internal enable a type of l2 tunnel */
+
+typedef int (*eth_l2_tunnel_disable_t)
+	(struct rte_eth_dev *dev,
+	 enum rte_eth_l2_tunnel_type l2_tunnel_type);
+/**< @internal disable a type of l2 tunnel */
+
 #ifdef RTE_NIC_BYPASS
 
 enum {
@@ -1443,6 +1465,12 @@ struct eth_dev_ops {
 	eth_timesync_read_time timesync_read_time;
 	/** Set the device clock time. */
 	eth_timesync_write_time timesync_write_time;
+	/** Config ether type of l2 tunnel */
+	eth_l2_tunnel_eth_type_conf_t l2_tunnel_eth_type_conf;
+	/** Enable a type of l2 tunnel */
+	eth_l2_tunnel_enable_t l2_tunnel_enable;
+	/** Disable a type of l2 tunnel */
+	eth_l2_tunnel_disable_t l2_tunnel_disable;
 };
 
 /**
@@ -3887,6 +3915,62 @@ rte_eth_dma_zone_reserve(const struct rte_eth_dev *eth_dev, const char *name,
 			 uint16_t queue_id, size_t size,
 			 unsigned align, int socket_id);
 
+ /**
+ * Config l2 tunnel ether type of an Ethernet device for filtering specific
+ * tunnel packets by ether type.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param l2_tunnel
+ *   l2 tunnel configuration.
+ *
+ * @return
+ *   - (0) if successful.
+ *   - (-ENODEV) if port identifier is invalid.
+ *   - (-ENOTSUP) if hardware doesn't support tunnel type.
+ */
+int
+rte_eth_dev_l2_tunnel_eth_type_conf(uint8_t port_id,
+				    struct rte_eth_l2_tunnel *l2_tunnel);
+
+ /**
+ * Enable the ability of parsing a type of l2 tunnel of an Ethernet device.
+ * Filtering, forwarding and offloading this type of tunnel packets depend on
+ * this ability.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param l2_tunnel_type
+ *   The type of l2 tunnel.
+ *
+ * @return
+ *   - (0) if successful.
+ *   - (-ENODEV) if port identifier is invalid.
+ *   - (-ENOTSUP) if hardware doesn't support tunnel type.
+ */
+int
+rte_eth_dev_l2_tunnel_enable(uint8_t port_id,
+			     enum rte_eth_l2_tunnel_type l2_tunnel_type);
+
+ /**
+ * Disable the ability of parsing a type of l2 tunnel of an Ethernet device.
+ * Filtering, forwarding and offloading this type of tunnel packets will not
+ * work either even if they're enabled.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param l2_tunnel_type
+ *   The type of l2 tunnel.
+ *
+ * @return
+ *   - (0) if successful.
+ *   - (-ENODEV) if port identifier is invalid.
+ *   - (-ENOTSUP) if hardware doesn't support tunnel type.
+ */
+int
+rte_eth_dev_l2_tunnel_disable(uint8_t port_id,
+			      enum rte_eth_l2_tunnel_type l2_tunnel_type);
+
 #ifdef __cplusplus
 }
 #endif
-- 
1.9.3