doc: add secondary VF details in thunderx guide

thunderx-nic uses secondary VF's to provide more queues to DPDK.
Current instructions explain the concept but don't show an easy way to
find which PCI id is primary and which is secondary VF's.

This patch extending the documentation of secondary VF w.r.t
the enumeration details.

Signed-off-by: Krzysztof Kanas <kkanas@marvell.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>

diff --git a/doc/guides/nics/thunderx.rst b/doc/guides/nics/thunderx.rst
index 3b75a9a..89d439d 100644 (file)
--- a/doc/guides/nics/thunderx.rst
+++ b/doc/guides/nics/thunderx.rst
@@ -313,6 +313,55 @@ We will choose four secondary queue sets from the ending of the list (0002:01:01
 
 The nicvf thunderx driver will make use of attached secondary VFs automatically during the interface configuration stage.
 
+driver thunder-nic VF's
+~~~~~~~~~~~~~~~~~~~~~~~
+
+Use sysfs to distinguish thunder-nic primary VFs and secondary VFs.
+   .. code-block:: console
+
+   ll /sys/bus/pci/drivers/thunder-nic/
+   total 0
+   drwxr-xr-x  2 root root     0 Jan 22 11:19 ./
+   drwxr-xr-x 86 root root     0 Jan 22 11:07 ../
+   lrwxrwxrwx  1 root root     0 Jan 22 11:19 0001:01:00.0 -> '../../../../devices/platform/soc@0/849000000000.pci/pci0001:00/0001:00:10.0/0001:01:00.0'/
+
+   cat /sys/bus/pci/drivers/thunder-nic/0001\:01\:00.0/sriov_sqs_assignment
+   12
+   0 0001:01:00.1 vfio-pci +: 12 13
+   1 0001:01:00.2 thunder-nicvf -:
+   2 0001:01:00.3 thunder-nicvf -:
+   3 0001:01:00.4 thunder-nicvf -:
+   4 0001:01:00.5 thunder-nicvf -:
+   5 0001:01:00.6 thunder-nicvf -:
+   6 0001:01:00.7 thunder-nicvf -:
+   7 0001:01:01.0 thunder-nicvf -:
+   8 0001:01:01.1 thunder-nicvf -:
+   9 0001:01:01.2 thunder-nicvf -:
+   10 0001:01:01.3 thunder-nicvf -:
+   11 0001:01:01.4 thunder-nicvf -:
+   12 0001:01:01.5 vfio-pci: 0
+   13 0001:01:01.6 vfio-pci: 0
+   14 0001:01:01.7 thunder-nicvf: 255
+   15 0001:01:02.0 thunder-nicvf: 255
+   16 0001:01:02.1 thunder-nicvf: 255
+   17 0001:01:02.2 thunder-nicvf: 255
+   18 0001:01:02.3 thunder-nicvf: 255
+   19 0001:01:02.4 thunder-nicvf: 255
+   20 0001:01:02.5 thunder-nicvf: 255
+   21 0001:01:02.6 thunder-nicvf: 255
+   22 0001:01:02.7 thunder-nicvf: 255
+   23 0001:01:03.0 thunder-nicvf: 255
+   24 0001:01:03.1 thunder-nicvf: 255
+   25 0001:01:03.2 thunder-nicvf: 255
+   26 0001:01:03.3 thunder-nicvf: 255
+   27 0001:01:03.4 thunder-nicvf: 255
+   28 0001:01:03.5 thunder-nicvf: 255
+   29 0001:01:03.6 thunder-nicvf: 255
+   30 0001:01:03.7 thunder-nicvf: 255
+   31 0001:01:04.0 thunder-nicvf: 255
+
+Every column that ends with 'thunder-nicvf: number' can be used as secondary VF.
+In printout above all entres after '14 0001:01:01.7 thunder-nicvf: 255' can be used as secondary VF.
 
 Module params
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