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authorLogan Gunthorpe <logang@deltatee.com>2017-08-03 12:19:54 -0600
committerJon Mason <jdmason@kudzu.us>2017-11-18 20:37:13 -0500
commitd0450244a4920187eebf844a1610744059b59ee6 (patch)
tree03166de101e524f036eaff3ac46bd6cd0bbb8953 /Documentation/switchtec.txt
parent87d11e645e31d66be751211946e8d1e3eb624066 (diff)
downloadlinux-d0450244a4920187eebf844a1610744059b59ee6.tar.bz2
NTB: switchtec_ntb: Update switchtec documentation with notes for NTB
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> Acked-by: Allen Hubbe <Allen.Hubbe@dell.com> Signed-off-by: Jon Mason <jdmason@kudzu.us>
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diff --git a/Documentation/switchtec.txt b/Documentation/switchtec.txt
index a0a9c7b3d4d5..f788264921ff 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 switchtec_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.