[dpdk-dev] [PATCH 1/7] ethdev: add set ptype function

[<pbhagavatula@marvell.com>]

From: Pavan Nikhilesh <pbhagavatula@marvell.com>

Add `rte_eth_dev_set_supported_ptypes` function that will allow the
application to inform the PMD the packet types it is interested in.
Based on the ptypes set PMDs can optimize their Rx path.

-If application doesn’t want any ptype information it can call
`rte_eth_dev_set_supported_ptypes(ethdev_id, RTE_PTYPE_UNKNOWN)` and PMD
will set rte_mbuf::packet_type to 0.

-If application doesn’t call `rte_eth_dev_set_supported_ptypes` PMD can
return `rte_mbuf::packet_type` with `rte_eth_dev_get_supported_ptypes`.

-If application is interested only in L2/L3 layer, it can inform the PMD
to update `rte_mbuf::packet_type` with L2/L3 ptype by calling
`rte_eth_dev_set_supported_ptypes(ethdev_id,
		RTE_PTYPE_L2_MASK | RTE_PTYPE_L3_MASK)`.

Suggested-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
---
 doc/guides/nics/features.rst        | 12 ++++++++----
 lib/librte_ethdev/rte_ethdev.c      | 28 ++++++++++++++++++++++++++++
 lib/librte_ethdev/rte_ethdev.h      | 17 +++++++++++++++++
 lib/librte_ethdev/rte_ethdev_core.h |  6 ++++++
 4 files changed, 59 insertions(+), 4 deletions(-)

diff --git a/doc/guides/nics/features.rst b/doc/guides/nics/features.rst
index c4e128d2f..d4d55f721 100644
--- a/doc/guides/nics/features.rst
+++ b/doc/guides/nics/features.rst
@@ -582,10 +582,14 @@ Supports inner packet L4 checksum.
 Packet type parsing
 -------------------

-Supports packet type parsing and returns a list of supported types.
-
-* **[implements] eth_dev_ops**: ``dev_supported_ptypes_get``.
-* **[related]    API**: ``rte_eth_dev_get_supported_ptypes()``.
+Supports packet type parsing and returns a list of supported types. Allows
+application to set ptypes it is interested in.
+
+* **[implements] eth_dev_ops**: ``dev_supported_ptypes_get``,
+  ``dev_supported_ptypes_set``.
+* **[related]    API**: ``rte_eth_dev_get_supported_ptypes()``,
+  ``rte_eth_dev_set_supported_ptypes()``.
+* **[provides]   mbuf**: ``mbuf.packet_type``.


 .. _nic_features_timesync:
diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index 17d183e1f..72fe660c3 100644
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -2602,6 +2602,34 @@ rte_eth_dev_get_supported_ptypes(uint16_t port_id, uint32_t ptype_mask,
 	return j;
 }

+int
+rte_eth_dev_set_supported_ptypes(uint16_t port_id, uint32_t ptype_mask)
+{
+	int i;
+	struct rte_eth_dev *dev;
+	const uint32_t *all_ptypes;
+	uint32_t all_ptype_mask = 0;
+
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+	dev = &rte_eth_devices[port_id];
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_supported_ptypes_set,
+				-ENOTSUP);
+	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_supported_ptypes_get,
+				-ENOTSUP);
+	all_ptypes = (*dev->dev_ops->dev_supported_ptypes_get)(dev);
+
+	if (!all_ptypes)
+		return -ENOTSUP;
+
+	for (i = 0; all_ptypes[i] != RTE_PTYPE_UNKNOWN; ++i)
+		all_ptype_mask |= all_ptypes[i];
+
+	if ((all_ptype_mask & ptype_mask) != ptype_mask)
+		return -ENOTSUP;
+
+	return (*dev->dev_ops->dev_supported_ptypes_set)(dev, ptype_mask);
+}
+
 void
 rte_eth_macaddr_get(uint16_t port_id, struct rte_ether_addr *mac_addr)
 {
diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
index dc6596bc9..f97f0a6e5 100644
--- a/lib/librte_ethdev/rte_ethdev.h
+++ b/lib/librte_ethdev/rte_ethdev.h
@@ -2431,6 +2431,23 @@ int rte_eth_dev_fw_version_get(uint16_t port_id,
  */
 int rte_eth_dev_get_supported_ptypes(uint16_t port_id, uint32_t ptype_mask,
 				     uint32_t *ptypes, int num);
+/**
+ * Request Ethernet device to set only specific packet types in the packet.
+ *
+ * Application can use this function to set only specific ptypes that it's
+ * interested. This information can be used by the PMD to optimize Rx path.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param ptype_mask
+ *   The ptype family that application is interested in.
+ * @return
+ *   - (0) Successfully set supported ptypes.
+ *   - (-ENODEV) if *port_id* is invalid.
+ *   - (-ENOTSUP) Packet type mask supplied is not supported by the Ethernet
+ *		  device.
+ */
+int rte_eth_dev_set_supported_ptypes(uint16_t port_id, uint32_t ptype_mask);

 /**
  * Retrieve the MTU of an Ethernet device.
diff --git a/lib/librte_ethdev/rte_ethdev_core.h b/lib/librte_ethdev/rte_ethdev_core.h
index 2922d5b7c..02ee7c12c 100644
--- a/lib/librte_ethdev/rte_ethdev_core.h
+++ b/lib/librte_ethdev/rte_ethdev_core.h
@@ -110,6 +110,10 @@ typedef void (*eth_dev_infos_get_t)(struct rte_eth_dev *dev,
 typedef const uint32_t *(*eth_dev_supported_ptypes_get_t)(struct rte_eth_dev *dev);
 /**< @internal Get supported ptypes of an Ethernet device. */

+typedef int (*eth_dev_supported_ptypes_set_t)(struct rte_eth_dev *dev,
+					      uint32_t ptype_mask);
+/**< @internal Set required ptypes of an Ethernet device. */
+
 typedef int (*eth_queue_start_t)(struct rte_eth_dev *dev,
 				    uint16_t queue_id);
 /**< @internal Start rx and tx of a queue of an Ethernet device. */
@@ -421,6 +425,8 @@ struct eth_dev_ops {
 	eth_fw_version_get_t       fw_version_get; /**< Get firmware version. */
 	eth_dev_supported_ptypes_get_t dev_supported_ptypes_get;
 	/**< Get packet types supported and identified by device. */
+	eth_dev_supported_ptypes_set_t dev_supported_ptypes_set;
+	/**< Inform device about the interested ptypes. */

 	vlan_filter_set_t          vlan_filter_set; /**< Filter VLAN Setup. */
 	vlan_tpid_set_t            vlan_tpid_set; /**< Outer/Inner VLAN TPID Setup. */
--
2.22.0