Few more minor if_vmx tweaks

 - Allow the Rx/Tx queue sizes to be configured by tunables
 - Bail out earlier if the Tx queue unlikely has enough free
   descriptors to hold the frame
 - Cleanup some of the offloading capabilities handling

1 files changed, 20 insertions, 1 deletions

diff --git a/share/man/man4/vmx.4 b/share/man/man4/vmx.4
index 0e7b7f8..b33f1ed 100644
--- a/share/man/man4/vmx.4
+++ b/share/man/man4/vmx.4
@@ -81,6 +81,25 @@ VMware Fusion 2.0 and newer
 .Pp
 For more information on configuring this device, see
 .Xr ifconfig 8 .
+.Sh LOADER TUNABLES
+Tunables can be set at the
+.Xr loader 8
+prompt before booting the kernel or stored in
+.Xr loader.conf 5 .
+.Bl -tag -width indent
+.It Va hw.vmx.txndesc
+.It Va hw.vmx. Ns Ar X Ns Va .txndesc
+.Pp
+Number of transmit descriptors allocated by the driver.
+The default value is 512.
+The value must be a multiple of 32, and the maximum is 4096.
+.It Va hw.vmx.rxndesc
+.It Va hw.vmx. Ns Ar X Ns Va .rxndesc
+.Pp
+Number of receive descriptors per ring allocated by the driver.
+The default value is 256.
+The value must be a multiple of 32, and the maximum is 2048.
+There are two rings so the actual usage is doubled.
 .Sh EXAMPLES
 The following entry must be added to the VMware configuration file
 to provide the
@@ -104,7 +123,7 @@ The
 .Nm
 driver was ported from
 .Ox
-by
+and significantly rewritten by
 .An Bryan Venteicher Aq bryanv@freebsd.org .
 The
 .Ox