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Update manpage for AMD 10GbE driver

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Approved by: vmaffione, gallatin

Differential Revision: https://reviews.freebsd.org/D28724

MFC after:	1 week
This commit is contained in:
Rajesh Kumar M A 2021-02-24 05:01:10 +00:00
parent 1af48800c2
commit ec78688666
1 changed files with 22 additions and 51 deletions
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73
share/man/man4/axp.4
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@ -29,7 +29,7 @@
.\"
.\" * Other names and brands may be claimed as the property of others.
.\"
.Dd January 24, 2021
.Dd February 19, 2021
.Dt AXP 4
.Os
.Sh NAME
@ -133,10 +133,23 @@ of the register by reading the second variable.
Configure the log-level for the driver.
Default is 0.
Supports 0-3.
.It Va dev.ax.X.single_fl
.It Va dev.ax.X.link_workaround
This variable enables the workaround for an intermittent link issue.
When link does not come up for long time, this variable can be set to 1 to
reset the phy and bring up the link.
.El
.Sh LOADER TUNABLES
The following variable is available as
.Xr loader.conf 5
tunable.
.Bl -tag -width indent
.It Va dev.ax.X.sph_enable
This variable controls split header feature for the interface.
Default is 1, meaning the split header support is enabled.
.Pp
This variable must be set before loading the driver, either via
.Xr loader.conf 5
or through the use of
or through
.Xr kenv 1 .
This cannot be modified when driver is loaded.
.Pp
@ -146,55 +159,13 @@ needs the system to be restarted to take effect.
When using
.Xr kenv 1 ,
use the wrapper variable
.Va dev.ax.single_fl\&,
which will configure all AMD interfaces with single freelist per receive queue.
Default is 2 freelist per receive queue.
.Va dev.ax.sph_enable ,
which will configure(enable/disable) split header support for all
.Nm
interfaces.
.Pp
This variable is to configure the interface when single freelist is needed.
(For Eg. netmap).
Basically, this will control the software behavior of how the receive
descriptors are used.
.Pp
Setting this variable to 1, will use 1 Freelist per receive queue.
.Pp
Setting this variable to 0, will use 2 Freelist per receive queue.
.Pp
Based on the setting, the receive buffers are programmed accordingly on the
received descriptors.
.Pp
By default, this variable will be set to 0, meaning the interfaces will be
configured for regular data traffic (not netmap traffic).
.It Va dev.ax.X.sph_enabled
This variable must be set before loading the driver, either via
.Xr loader.conf 5
or through the use of
.Xr kenv 1 .
This cannot be modified when driver is loaded.
.Pp
Setting this variable in
.Xr loader.conf 5
needs the system to be restarted to take effect.
When using
.Xr kenv 1 ,
use the wrapper variable
.Va dev.ax.sph_enable\&,
which will configure(enable/disable) split header support in all
AMD interfaces.
.Pp
This variable is to control enable/disable of the split header feature in
the interface.
.Pp
Setting this variable to 1, will enable split header feature.
.Pp
Setting this variable to 0, will disable split header feature.
.Pp
By default, this variable will be set to 1, meaning the Split header support be
enabled.
.Pp
NOTE: It is recommended to use this variable only when
.Va single_fl\&
is configured.
Otherwise let it be default value.
To use netmap with this device, split header support must be disabled
(set this variable to 0).
.El
.Sh SEE ALSO
.Xr arp 4 ,