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[16/16] switchtec_ntb: update switchtec documentation with notes for ntb

Message ID 20170629032648.3073-17-logang@deltatee.com
State Not Applicable
Headers show

Commit Message

Logan Gunthorpe June 29, 2017, 3:26 a.m. UTC 
The switchtec_ntb driver has a couple requirements on the switchec's
hardware configuration so we add these notes to the documentation.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Stephen Bates <sbates@raithlin.com>
Reviewed-by: Kurt Schwemmer <kurt.schwemmer@microsemi.com>
---
 Documentation/switchtec.txt | 12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/Documentation/switchtec.txt b/Documentation/switchtec.txt
index a0a9c7b3d4d5..978a346e1fb3 100644
--- a/Documentation/switchtec.txt
+++ b/Documentation/switchtec.txt
@@ -78,3 +78,15 @@  The following IOCTLs are also supported by the device:
   between PCI Function Framework number (used by the event system)
   and Switchtec Logic Port ID and Partition number (which is more
   user friendly).
+
+
+Non-Transparent Bridge (NTB) Driver
+===================================
+
+An NTB driver is provided for the switchtec hardware in switchec_ntb.
+Currently, it only supports switches configured with exactly 2
+partitions. It also requires the following configuration settings:
+
+* Both partitions must be able to access each other's GAS spaces.
+  Thus, the bits in the GAS Access Vector under Management Settings
+  must be set to support this.