From b9fcaeec5fc04b1c23ddb919762a8fe89172caf1 Mon Sep 17 00:00:00 2001 From: Changchun Ouyang Date: Tue, 3 Mar 2015 16:50:48 +0800 Subject: [PATCH] doc: add ixgbe VF RSS guide Update the prog guide for commit: 42d2f78abcb77ecb769be Signed-off-by: Changchun Ouyang --- doc/guides/nics/intel_vf.rst | 38 ++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/doc/guides/nics/intel_vf.rst b/doc/guides/nics/intel_vf.rst index 0c0b7b5ce1..e7736275f0 100644 --- a/doc/guides/nics/intel_vf.rst +++ b/doc/guides/nics/intel_vf.rst @@ -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= --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. -- 2.20.1