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.\"
.\" This file and its contents are supplied under the terms of the
.\" Common Development and Distribution License ("CDDL"), version 1.0.
.\" You may only use this file in accordance with the terms of version
.\" 1.0 of the CDDL.
.\"
.\" A full copy of the text of the CDDL should have accompanied this
.\" source. A copy of the CDDL is also available via the Internet at
.\" http://www.illumos.org/license/CDDL.
.\"
.\"
.\" Copyright 2016 Joyent, Inc.
.\"
.Dd June 02, 2016
.Dt MAC_TX_UPDATE 9F
.Os
.Sh NAME
.Nm mac_tx_update
.Nd indicate that a device can transmit again
.Sh SYNOPSIS
.In sys/mac_provider.h
.Ft void
.Fo mac_tx_update
.Fa "mac_handle_t mh"
.Fc
.Sh INTERFACE LEVEL
illumos DDI specific
.Sh PARAMETERS
.Bl -tag -width Fa
.It Fa mh
The MAC handle obtained from a call to
.Xr mac_register 9F .
.El
.Sh DESCRIPTION
The
.Fn mac_tx_update
function is used by device drivers to indicate that the device
represented by the handle
.Fa mh
can transmit data again.
It should only be called after the device driver has returned data from its
.Xr mc_tx 9E
endpoint.
For more information on when this should be called, see both
.Xr mc_tx 9E
and the
.Sx Transmitting Data and Back Pressure
section of
.Xr mac 9E .
.Pp
Device drivers should not hold any of their own locks when calling into
this function.
See the
.Sx MAC Callbacks
section of
.Xr mac 9E
for more information.
.Sh CONTEXT
The
.Fn mac_tx_update
function may be called from
.Sy user ,
.Sy kernel ,
or
.Sy interrupt
context.
.Sh SEE ALSO
.Xr mac 9E ,
.Xr mc_tx 9E ,
.Xr mac_register 9F
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