Fix Tx performance on urtwn(4) RTL8192EU devices.

The "driver rate" bit which tells firmware to use the driver-provided
Tx rate is in a different spot of Tx descriptor double word 3.
Fix the corresponding macro definition.

The device was sending all frames at CCK1 because of this bug, regardless
of the Tx rate the driver had chosen.

tcpbench before:
Conn:   1 Mbps:        0.808 Peak Mbps:        1.108 Avg Mbps:        0.808

tcpbench with fix:
Conn:   1 Mbps:       21.078 Peak Mbps:       21.078 Avg Mbps:       21.078

ok jmatthew@

diff --git a/sys/dev/ic/r92creg.h b/sys/dev/ic/r92creg.h
index 6a9f796..0ef8996 100644 (file)
--- a/sys/dev/ic/r92creg.h
+++ b/sys/dev/ic/r92creg.h
@@ -1,4 +1,4 @@
-/*     $OpenBSD: r92creg.h,v 1.25 2020/06/11 00:56:12 jmatthew Exp $   */
+/*     $OpenBSD: r92creg.h,v 1.26 2022/03/14 14:15:33 stsp Exp $       */
 
 /*-
  * Copyright (c) 2010 Damien Bergamini <damien.bergamini@free.fr>
@@ -1620,7 +1620,7 @@ struct r92e_tx_desc_usb {
 #define R88E_TXDW2_AGGBK       0x00010000
 #define R92C_TXDW2_CCX_RPT     0x00080000
 
-#define R92E_TXDW3_DRVRATE     0x1000
+#define R92E_TXDW3_DRVRATE     0x0100
 #define R23A_TXDW3_TXRPTEN     0x4000
 #define R92C_TXDW3_HWSEQEN     0x8000