Author: cem
Date: Tue Jan 5 20:42:19 2016
New Revision: 293221
URL: https://svnweb.freebsd.org/changeset/base/293221
Log:
ioat(4): Add ioat_get_max_io_size() KPI
Consumers need to know the permitted IO size to send maximally sized
chunks to the hardware.
Sponsored by: EMC / Isilon Storage Division
Modified:
head/share/man/man4/ioat.4
head/sys/dev/ioat/ioat.c
head/sys/dev/ioat/ioat.h
Modified: head/share/man/man4/ioat.4
==============================================================================
--- head/share/man/man4/ioat.4 Tue Jan 5 20:37:36 2016 (r293220)
+++ head/share/man/man4/ioat.4 Tue Jan 5 20:42:19 2016 (r293221)
@@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd December 17, 2015
+.Dd January 5, 2016
.Dt IOAT 4
.Os
.Sh NAME
@@ -65,6 +65,8 @@ In
.Fn ioat_put_dmaengine "bus_dmaengine_t dmaengine"
.Ft int
.Fn ioat_get_hwversion "bus_dmaengine_t dmaengine"
+.Ft size_t
+.Fn ioat_get_max_io_size "bus_dmaengine_t dmaengine"
.Ft int
.Fn ioat_set_interrupt_coalesce "bus_dmaengine_t dmaengine" "uint16_t delay"
.Ft uint16_t
Modified: head/sys/dev/ioat/ioat.c
==============================================================================
--- head/sys/dev/ioat/ioat.c Tue Jan 5 20:37:36 2016 (r293220)
+++ head/sys/dev/ioat/ioat.c Tue Jan 5 20:42:19 2016 (r293221)
@@ -744,6 +744,15 @@ ioat_get_hwversion(bus_dmaengine_t dmaen
return (ioat->version);
}
+size_t
+ioat_get_max_io_size(bus_dmaengine_t dmaengine)
+{
+ struct ioat_softc *ioat;
+
+ ioat = to_ioat_softc(dmaengine);
+ return (ioat->max_xfer_size);
+}
+
int
ioat_set_interrupt_coalesce(bus_dmaengine_t dmaengine, uint16_t delay)
{
Modified: head/sys/dev/ioat/ioat.h
==============================================================================
--- head/sys/dev/ioat/ioat.h Tue Jan 5 20:37:36 2016 (r293220)
+++ head/sys/dev/ioat/ioat.h Tue Jan 5 20:42:19 2016 (r293221)
@@ -70,6 +70,7 @@ void ioat_put_dmaengine(bus_dmaengine_t
/* Check the DMA engine's HW version */
int ioat_get_hwversion(bus_dmaengine_t dmaengine);
+size_t ioat_get_max_io_size(bus_dmaengine_t dmaengine);
/*
* Set interrupt coalescing on a DMA channel.
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