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doc: add ixgbe VF RSS guide

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Update the prog guide for commit: 42d2f78abc

Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com>
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Changchun Ouyang 2015-03-03 16:50:48 +08:00 committed by Thomas Monjalon
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commit b9fcaeec5f
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doc/guides/nics/intel_vf.rst
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@ -155,6 +155,44 @@ For example,
Launch the DPDK testpmd/example or your own host daemon application using the DPDK PMD library.
* Using the DPDK PMD PF ixgbe driver to enable VF RSS:
Same steps as above to install the modules of uio, igb_uio, specify max_vfs for PCI device, and
launch the DPDK testpmd/example or your own host daemon application using the DPDK PMD library.
The available queue number(at most 4) per VF depends on the total number of pool, which is
determined by the max number of VF at PF initialization stage and the number of queue specified
in config:
* If the max number of VF is set in the range of 1 to 32:
If the number of rxq is specified as 4(e.g. '--rxq 4' in testpmd), then there are totally 32
pools(ETH_32_POOLS), and each VF could have 4 or less(e.g. 2) queues;
If the number of rxq is specified as 2(e.g. '--rxq 2' in testpmd), then there are totally 32
pools(ETH_32_POOLS), and each VF could have 2 queues;
* If the max number of VF is in the range of 33 to 64:
If the number of rxq is 4 ('--rxq 4' in testpmd), then error message is expected as rxq is not
correct at this case;
If the number of rxq is 2 ('--rxq 2' in testpmd), then there is totally 64 pools(ETH_64_POOLS),
and each VF have 2 queues;
On host, to enable VF RSS functionality, rx mq mode should be set as ETH_MQ_RX_VMDQ_RSS
or ETH_MQ_RX_RSS mode, and SRIOV mode should be activated(max_vfs >= 1).
It also needs config VF RSS information like hash function, RSS key, RSS key length.
.. code-block:: console
testpmd -c 0xffff -n 4 -- --coremask=<core-mask> --rxq=4 --txq=4 -i
The limitation for VF RSS on Intel® 82599 10 Gigabit Ethernet Controller is:
The hash and key are shared among PF and all VF, the RETA table with 128 entries is also shared
among PF and all VF; So it could not to provide a method to query the hash and reta content per
VF on guest, while, if possible, please query them on host(PF) for the shared RETA information.
Virtual Function enumeration is performed in the following sequence by the Linux* pci driver for a dual-port NIC.
When you enable the four Virtual Functions with the above command, the four enabled functions have a Function#
represented by (Bus#, Device#, Function#) in sequence starting from 0 to 3.