--------------------------------------
ENIC PMD support is integrated into the DPDK suite. dpdk-<version>.tar.gz
-should be downloaded from http://core.dpdk.org/download/
+should be downloaded from https://core.dpdk.org/download/
Configuration information
-------------------------
-- **DPDK Configuration Parameters**
-
- The following configuration options are available for the ENIC PMD:
-
- - **CONFIG_RTE_LIBRTE_ENIC_PMD** (default y): Enables or disables inclusion
- of the ENIC PMD driver in the DPDK compilation.
-
- **vNIC Configuration Parameters**
- **Number of Queues**
In the VM, the kernel enic driver may be automatically bound to the VF during
boot. Unbinding it currently hangs due to a known issue with the driver. To
-work around the issue, blacklist the enic module as follows.
+work around the issue, block the enic module as follows.
Please see :ref:`Limitations <enic_limitations>` for limitations in
the use of SR-IOV.
By default, PMD enables overlay offload if hardware supports it. To disable
it, set ``devargs`` parameter ``disable-overlay=1``. For example::
- -w 12:00.0,disable-overlay=1
+ -a 12:00.0,disable-overlay=1
By default, the NIC uses 4789 as the VXLAN port. The user may change
it through ``rte_eth_dev_udp_tunnel_port_{add,delete}``. However, as
PMD consider the vectorized handler when selecting the receive handler.
For example::
- -w 12:00.0,enable-avx2-rx=1
+ -a 12:00.0,enable-avx2-rx=1
As the current implementation is intended for field trials, by default, the
vectorized handler is not considered (``enable-avx2-rx=0``).
enic_use_vector_rx_handler use the non-scatter avx2 Rx handler
+64B Completion Queue Entry
+--------------------------
+
+Recent VIC adapters support 64B completion queue entries, as well as
+16B entries that are available on all adapter models. ENIC PMD enables
+and uses 64B entries by default, if available. 64B entries generally
+lower CPU cycles per Rx packet, as they avoid partial DMA writes and
+reduce cache contention between DMA and polling CPU. The effect is
+most pronounced when multiple Rx queues are used on Intel platforms
+with Data Direct I/O Technology (DDIO).
+
+If 64B entries are not available, PMD uses 16B entries. The user may
+explicitly disable 64B entries and use 16B entries by setting
+``devarg`` parameter ``cq64=0``. For example::
+
+ -a 12:00.0,cq64=0
+
+To verify the selected entry size, enable debug logging
+(``--log-level=enic,debug``) and check the following messages.
+
+.. code-block:: console
+
+ PMD: rte_enic_pmd: Supported CQ entry sizes: 16 32
+ PMD: rte_enic_pmd: Using 16B CQ entry size
+
.. _enic_limitations:
Limitations
PKT_RX_VLAN_STRIPPED mbuf flags would not be set. This mode is enabled with the
``devargs`` parameter ``ig-vlan-rewrite=untag``. For example::
- -w 12:00.0,ig-vlan-rewrite=untag
+ -a 12:00.0,ig-vlan-rewrite=untag
- **SR-IOV**
- VF devices are not usable directly from the host. They can only be used
as assigned devices on VM instances.
- Currently, unbind of the ENIC kernel mode driver 'enic.ko' on the VM
- instance may hang. As a workaround, enic.ko should be blacklisted or removed
+ instance may hang. As a workaround, enic.ko should be blocked or removed
from the boot process.
- pci_generic cannot be used as the uio module in the VM. igb_uio or
vfio in non-IOMMU mode can be used.
PMD. Typically, the limit has to be raised to higher than 2GB.
e.g., 2621440
-The compilation of any unused drivers can be disabled using the
-configuration file in config/ directory (e.g., config/common_linux).
-This would help in bringing down the time taken for building the
-libraries and the initialization time of the application.
-
Additional Reference
--------------------
git.droids-corp.org / dpdk.git / blobdiff