From 24122401b9ebcf879903d500964b43fa68cfb895 Mon Sep 17 00:00:00 2001
From: Henrik Austad <henrik@austad.us>
Date: Wed, 19 Oct 2016 12:28:38 +0200
Subject: [TSN RFC v2 1/9] igb: add missing fields to TXDCTL-register
To: linux-kernel@vger.kernel.org
Cc: linux-media@vger.kernel.org,
    alsa-devel@vger.kernel.org,
    netdev@vger.kernel.org

The current list of E1000_TXDCTL-registers is incomplete. This adds the
missing parts for the Transmit Descriptor Control (TXDCTL) register.

The rest of these values (threshold for descriptor read/write) for
TXDCTL seems to be defined in igb/igb.h, not sure why this is split
though.

It seems that this was left out in the commit that added support for
82575 Gigabit Ethernet driver 9d5c8243 (igb: PCI-Express 82575 Gigabit
Ethernet driver).

Cc: linux-kernel@vger.kernel.org
Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Cc: intel-wired-lan@lists.osuosl.org
Signed-off-by: Henrik Austad <haustad@cisco.com>
---
 drivers/net/ethernet/intel/igb/e1000_82575.h |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux-4.9.20-rt16/drivers/net/ethernet/intel/igb/e1000_82575.h
===================================================================
--- linux-4.9.20-rt16.orig/drivers/net/ethernet/intel/igb/e1000_82575.h
+++ linux-4.9.20-rt16/drivers/net/ethernet/intel/igb/e1000_82575.h
@@ -158,7 +158,11 @@ struct e1000_adv_tx_context_desc {
 
 /* Additional Transmit Descriptor Control definitions */
 #define E1000_TXDCTL_QUEUE_ENABLE  0x02000000 /* Enable specific Tx Queue */
+
+/* Transmit Software Flush, sw-triggered desc writeback */
+#define E1000_TXDCTL_SWFLSH        0x04000000
 /* Tx Queue Arbitration Priority 0=low, 1=high */
+#define E1000_TXDCTL_PRIORITY      0x08000000
 
 /* Additional Receive Descriptor Control definitions */
 #define E1000_RXDCTL_QUEUE_ENABLE  0x02000000 /* Enable specific Rx Queue */